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-rw-r--r--daemon/.packaging/centos/7/builddeps13
-rwxr-xr-xdaemon/.packaging/centos/7/pre-build.sh9
-rwxr-xr-xdaemon/.packaging/centos/7/pre-run.sh8
-rw-r--r--daemon/.packaging/centos/7/rundeps6
-rw-r--r--daemon/.packaging/centos/8/builddeps14
-rwxr-xr-xdaemon/.packaging/centos/8/pre-build.sh9
-rwxr-xr-xdaemon/.packaging/centos/8/pre-run.sh7
-rw-r--r--daemon/.packaging/centos/8/rundeps6
-rw-r--r--daemon/.packaging/debian/10/builddeps12
-rwxr-xr-xdaemon/.packaging/debian/10/pre-build.sh11
-rwxr-xr-xdaemon/.packaging/debian/10/pre-run.sh11
-rw-r--r--daemon/.packaging/debian/10/rundeps15
-rw-r--r--daemon/.packaging/debian/9/builddeps12
-rwxr-xr-xdaemon/.packaging/debian/9/pre-build.sh11
-rwxr-xr-xdaemon/.packaging/debian/9/pre-run.sh11
-rw-r--r--daemon/.packaging/debian/9/rundeps15
-rw-r--r--daemon/.packaging/fedora/31/builddeps14
-rwxr-xr-xdaemon/.packaging/fedora/31/pre-build.sh7
-rwxr-xr-xdaemon/.packaging/fedora/31/pre-run.sh6
-rw-r--r--daemon/.packaging/fedora/31/rundeps7
-rw-r--r--daemon/.packaging/fedora/32/builddeps14
-rwxr-xr-xdaemon/.packaging/fedora/32/pre-build.sh7
-rwxr-xr-xdaemon/.packaging/fedora/32/pre-run.sh6
-rw-r--r--daemon/.packaging/fedora/32/rundeps7
-rw-r--r--daemon/.packaging/leap/15.2/builddeps14
-rwxr-xr-xdaemon/.packaging/leap/15.2/pre-build.sh6
-rwxr-xr-xdaemon/.packaging/leap/15.2/pre-run.sh3
-rw-r--r--daemon/.packaging/leap/15.2/rundeps4
-rw-r--r--daemon/.packaging/leap/docker-image-name1
-rw-r--r--daemon/.packaging/test.config2
-rw-r--r--daemon/.packaging/ubuntu/16.04/builddeps16
-rwxr-xr-xdaemon/.packaging/ubuntu/16.04/pre-build.sh12
-rwxr-xr-xdaemon/.packaging/ubuntu/16.04/pre-run.sh12
-rw-r--r--daemon/.packaging/ubuntu/16.04/rundeps15
-rw-r--r--daemon/.packaging/ubuntu/18.04/builddeps16
-rwxr-xr-xdaemon/.packaging/ubuntu/18.04/pre-build.sh12
-rwxr-xr-xdaemon/.packaging/ubuntu/18.04/pre-run.sh12
-rw-r--r--daemon/.packaging/ubuntu/18.04/rundeps15
-rw-r--r--daemon/.packaging/ubuntu/20.04/builddeps16
-rwxr-xr-xdaemon/.packaging/ubuntu/20.04/pre-build.sh12
-rwxr-xr-xdaemon/.packaging/ubuntu/20.04/pre-run.sh12
-rw-r--r--daemon/.packaging/ubuntu/20.04/rundeps15
-rw-r--r--daemon/bindings/api.h12
-rw-r--r--daemon/bindings/cache.c463
-rw-r--r--daemon/bindings/cache.rst340
-rw-r--r--daemon/bindings/event.c209
-rw-r--r--daemon/bindings/event.rst139
-rw-r--r--daemon/bindings/impl.c95
-rw-r--r--daemon/bindings/impl.h90
-rw-r--r--daemon/bindings/modules.c77
-rw-r--r--daemon/bindings/modules.rst43
-rw-r--r--daemon/bindings/net.c1091
-rw-r--r--daemon/bindings/net_client.rst34
-rw-r--r--daemon/bindings/net_dns_tweaks.rst35
-rw-r--r--daemon/bindings/net_server.rst166
-rw-r--r--daemon/bindings/net_tlssrv.rst139
-rw-r--r--daemon/bindings/net_xdpsrv.rst138
-rw-r--r--daemon/bindings/worker.c81
-rw-r--r--daemon/bindings/worker.rst35
-rw-r--r--daemon/cache.test/clear.test.lua214
-rw-r--r--daemon/cache.test/insert_ns.test.integr/deckard.yaml14
-rw-r--r--daemon/cache.test/insert_ns.test.integr/kresd_config.j289
-rw-r--r--daemon/cache.test/insert_ns.test.integr/nondelegated_auth.rpl59
-rw-r--r--daemon/cache.test/testroot.zone1257
-rw-r--r--daemon/cache.test/testroot.zone.unsigned216
-rw-r--r--daemon/engine.c780
-rw-r--r--daemon/engine.h84
-rw-r--r--daemon/ffimodule.c305
-rw-r--r--daemon/ffimodule.h36
-rw-r--r--daemon/http.c669
-rw-r--r--daemon/http.h55
-rw-r--r--daemon/io.c992
-rw-r--r--daemon/io.h57
-rw-r--r--daemon/lua/controlsock.test.lua169
-rw-r--r--daemon/lua/distro-preconfig.lua.in16
-rw-r--r--daemon/lua/kluautil.lua84
-rw-r--r--daemon/lua/kres-gen.lua590
-rwxr-xr-xdaemon/lua/kres-gen.sh324
-rw-r--r--daemon/lua/kres.lua1072
-rw-r--r--daemon/lua/krprint.lua340
-rw-r--r--daemon/lua/krprint.test.lua292
-rw-r--r--daemon/lua/map.test.integr/deckard.yaml38
-rw-r--r--daemon/lua/map.test.integr/kresd_config.j2192
-rw-r--r--daemon/lua/map.test.integr/query-while-map-is-running.rpl312
-rw-r--r--daemon/lua/meson.build61
-rw-r--r--daemon/lua/postconfig.lua70
-rw-r--r--daemon/lua/sandbox.lua.in773
-rw-r--r--daemon/lua/trust_anchors.lua.in532
-rw-r--r--daemon/lua/trust_anchors.rst123
-rw-r--r--daemon/lua/trust_anchors.test/bootstrap.test.lua112
-rw-r--r--daemon/lua/trust_anchors.test/err_attr_extra_attr.xml16
-rw-r--r--daemon/lua/trust_anchors.test/err_attr_validfrom_invalid.xml16
-rw-r--r--daemon/lua/trust_anchors.test/err_attr_validfrom_missing.xml16
-rw-r--r--daemon/lua/trust_anchors.test/err_elem_extra.xml17
-rw-r--r--daemon/lua/trust_anchors.test/err_elem_missing.xml16
-rw-r--r--daemon/lua/trust_anchors.test/err_multi_ta.xml19
-rw-r--r--daemon/lua/trust_anchors.test/ok0_badtimes.xml16
-rw-r--r--daemon/lua/trust_anchors.test/ok1.xml10
-rw-r--r--daemon/lua/trust_anchors.test/ok1_expired1.xml16
-rw-r--r--daemon/lua/trust_anchors.test/ok1_notyet1.xml16
-rw-r--r--daemon/lua/trust_anchors.test/ok2.xml16
-rwxr-xr-xdaemon/lua/trust_anchors.test/regen.sh3
-rw-r--r--daemon/lua/trust_anchors.test/root.keys1
-rw-r--r--daemon/lua/trust_anchors.test/ta.test.lua85
-rw-r--r--daemon/lua/trust_anchors.test/unsupp_nonroot.xml10
-rw-r--r--daemon/lua/trust_anchors.test/unsupp_xml_v11.xml10
-rw-r--r--daemon/lua/trust_anchors.test/webserv.lua236
-rw-r--r--daemon/lua/trust_anchors.test/x509/ca-key.pem182
-rw-r--r--daemon/lua/trust_anchors.test/x509/ca.pem24
-rw-r--r--daemon/lua/trust_anchors.test/x509/ca.tmpl4
-rwxr-xr-xdaemon/lua/trust_anchors.test/x509/gen.sh13
-rw-r--r--daemon/lua/trust_anchors.test/x509/server-key.pem182
-rw-r--r--daemon/lua/trust_anchors.test/x509/server.pem27
-rw-r--r--daemon/lua/trust_anchors.test/x509/server.tmpl7
-rw-r--r--daemon/lua/trust_anchors.test/x509/wrongca-key.pem182
-rw-r--r--daemon/lua/trust_anchors.test/x509/wrongca.pem24
-rw-r--r--daemon/lua/trust_anchors.test/x509/wrongca.tmpl4
-rw-r--r--daemon/lua/zonefile.lua93
-rw-r--r--daemon/main.c592
-rw-r--r--daemon/meson.build64
-rw-r--r--daemon/network.c641
-rw-r--r--daemon/network.h130
-rw-r--r--daemon/scripting.rst396
-rw-r--r--daemon/session.c806
-rw-r--r--daemon/session.h147
-rw-r--r--daemon/tls.c1192
-rw-r--r--daemon/tls.h230
-rw-r--r--daemon/tls_ephemeral_credentials.c237
-rw-r--r--daemon/tls_session_ticket-srv.c246
-rw-r--r--daemon/udp_queue.c145
-rw-r--r--daemon/udp_queue.h16
-rw-r--r--daemon/worker.c2209
-rw-r--r--daemon/worker.h192
-rw-r--r--daemon/zimport.c815
-rw-r--r--daemon/zimport.h56
135 files changed, 22922 insertions, 0 deletions
diff --git a/daemon/.packaging/centos/7/builddeps b/daemon/.packaging/centos/7/builddeps
new file mode 100644
index 0000000..3247738
--- /dev/null
+++ b/daemon/.packaging/centos/7/builddeps
@@ -0,0 +1,13 @@
+gcc
+gcc-c++
+gnutls
+knot-libs
+knot-devel
+libcmocka-devel
+libedit-devel
+libcap-ng
+libuv-devel
+lmdb-devel
+luajit-devel
+meson
+systemd-devel
diff --git a/daemon/.packaging/centos/7/pre-build.sh b/daemon/.packaging/centos/7/pre-build.sh
new file mode 100755
index 0000000..d3a9503
--- /dev/null
+++ b/daemon/.packaging/centos/7/pre-build.sh
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+yum update -y
+yum install -y wget epel-release
+
+# add build repository
+cd /etc/yum.repos.d/
+wget https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/CentOS_7_EPEL/home:CZ-NIC:knot-resolver-build.repo
+
diff --git a/daemon/.packaging/centos/7/pre-run.sh b/daemon/.packaging/centos/7/pre-run.sh
new file mode 100755
index 0000000..ee15ec7
--- /dev/null
+++ b/daemon/.packaging/centos/7/pre-run.sh
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+yum update -y
+yum install -y wget epel-release
+
+# add build repository
+cd /etc/yum.repos.d/
+wget https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/CentOS_7_EPEL/home:CZ-NIC:knot-resolver-latest.repo
diff --git a/daemon/.packaging/centos/7/rundeps b/daemon/.packaging/centos/7/rundeps
new file mode 100644
index 0000000..648501e
--- /dev/null
+++ b/daemon/.packaging/centos/7/rundeps
@@ -0,0 +1,6 @@
+knot-libs
+libedit
+libuv
+luajit
+lua-basexx
+lua-http
diff --git a/daemon/.packaging/centos/8/builddeps b/daemon/.packaging/centos/8/builddeps
new file mode 100644
index 0000000..984fa0b
--- /dev/null
+++ b/daemon/.packaging/centos/8/builddeps
@@ -0,0 +1,14 @@
+gcc
+gcc-c++
+meson
+"pkgconfig(cmocka)"
+"pkgconfig(gnutls)"
+"pkgconfig(libedit)"
+"pkgconfig(libknot)"
+"pkgconfig(libzscanner)"
+"pkgconfig(libdnssec)"
+"pkgconfig(libsystemd)"
+"pkgconfig(libcap-ng)"
+"pkgconfig(libuv)"
+"pkgconfig(lmdb)"
+"pkgconfig(luajit)"
diff --git a/daemon/.packaging/centos/8/pre-build.sh b/daemon/.packaging/centos/8/pre-build.sh
new file mode 100755
index 0000000..31398f8
--- /dev/null
+++ b/daemon/.packaging/centos/8/pre-build.sh
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dnf install -y wget 'dnf-command(config-manager)' epel-release centos-release
+
+dnf config-manager --enable PowerTools
+dnf config-manager --enable Devel
+dnf config-manager --add-repo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/CentOS_8_EPEL/home:CZ-NIC:knot-resolver-build.repo
+dnf install -y knot
+dnf upgrade -y
diff --git a/daemon/.packaging/centos/8/pre-run.sh b/daemon/.packaging/centos/8/pre-run.sh
new file mode 100755
index 0000000..94f8eb0
--- /dev/null
+++ b/daemon/.packaging/centos/8/pre-run.sh
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dnf install -y wget 'dnf-command(config-manager)' epel-release centos-release
+
+dnf config-manager --enable PowerTools
+dnf config-manager --add-repo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/CentOS_8_EPEL/home:CZ-NIC:knot-resolver-latest.repo
+dnf upgrade -y
diff --git a/daemon/.packaging/centos/8/rundeps b/daemon/.packaging/centos/8/rundeps
new file mode 100644
index 0000000..e3779ec
--- /dev/null
+++ b/daemon/.packaging/centos/8/rundeps
@@ -0,0 +1,6 @@
+libedit
+knot-libs
+libuv
+luajit
+lua5.1-basexx
+lua5.1-http
diff --git a/daemon/.packaging/debian/10/builddeps b/daemon/.packaging/debian/10/builddeps
new file mode 100644
index 0000000..604993c
--- /dev/null
+++ b/daemon/.packaging/debian/10/builddeps
@@ -0,0 +1,12 @@
+debhelper
+libcmocka-dev
+libedit-dev
+libgnutls28-dev
+libknot-dev
+liblmdb-dev
+luajit-5.1-dev
+libsystemd-dev
+libuv1-dev
+luajit
+pkg-config
+meson
diff --git a/daemon/.packaging/debian/10/pre-build.sh b/daemon/.packaging/debian/10/pre-build.sh
new file mode 100755
index 0000000..dc3b801
--- /dev/null
+++ b/daemon/.packaging/debian/10/pre-build.sh
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add debian build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-build/Debian_10/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-build.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/Debian_10/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/debian/10/pre-run.sh b/daemon/.packaging/debian/10/pre-run.sh
new file mode 100755
index 0000000..3a3906a
--- /dev/null
+++ b/daemon/.packaging/debian/10/pre-run.sh
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-latest/Debian_10/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-latest.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/Debian_10/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/debian/10/rundeps b/daemon/.packaging/debian/10/rundeps
new file mode 100644
index 0000000..a0f40c1
--- /dev/null
+++ b/daemon/.packaging/debian/10/rundeps
@@ -0,0 +1,15 @@
+adduser
+dns-root-data
+systemd
+libc6
+libdnssec7
+libedit2
+libgcc1
+libgnutls30
+libknot10
+liblmdb0
+libluajit-5.1-2
+libstdc++6
+libsystemd0
+libuv1
+libzscanner3
diff --git a/daemon/.packaging/debian/9/builddeps b/daemon/.packaging/debian/9/builddeps
new file mode 100644
index 0000000..604993c
--- /dev/null
+++ b/daemon/.packaging/debian/9/builddeps
@@ -0,0 +1,12 @@
+debhelper
+libcmocka-dev
+libedit-dev
+libgnutls28-dev
+libknot-dev
+liblmdb-dev
+luajit-5.1-dev
+libsystemd-dev
+libuv1-dev
+luajit
+pkg-config
+meson
diff --git a/daemon/.packaging/debian/9/pre-build.sh b/daemon/.packaging/debian/9/pre-build.sh
new file mode 100755
index 0000000..953025f
--- /dev/null
+++ b/daemon/.packaging/debian/9/pre-build.sh
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add debian build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-build/Debian_9.0/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-build.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/Debian_9.0/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/debian/9/pre-run.sh b/daemon/.packaging/debian/9/pre-run.sh
new file mode 100755
index 0000000..fa8d377
--- /dev/null
+++ b/daemon/.packaging/debian/9/pre-run.sh
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-latest/Debian_9.0/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-latest.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/Debian_9.0/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/debian/9/rundeps b/daemon/.packaging/debian/9/rundeps
new file mode 100644
index 0000000..a0f40c1
--- /dev/null
+++ b/daemon/.packaging/debian/9/rundeps
@@ -0,0 +1,15 @@
+adduser
+dns-root-data
+systemd
+libc6
+libdnssec7
+libedit2
+libgcc1
+libgnutls30
+libknot10
+liblmdb0
+libluajit-5.1-2
+libstdc++6
+libsystemd0
+libuv1
+libzscanner3
diff --git a/daemon/.packaging/fedora/31/builddeps b/daemon/.packaging/fedora/31/builddeps
new file mode 100644
index 0000000..984fa0b
--- /dev/null
+++ b/daemon/.packaging/fedora/31/builddeps
@@ -0,0 +1,14 @@
+gcc
+gcc-c++
+meson
+"pkgconfig(cmocka)"
+"pkgconfig(gnutls)"
+"pkgconfig(libedit)"
+"pkgconfig(libknot)"
+"pkgconfig(libzscanner)"
+"pkgconfig(libdnssec)"
+"pkgconfig(libsystemd)"
+"pkgconfig(libcap-ng)"
+"pkgconfig(libuv)"
+"pkgconfig(lmdb)"
+"pkgconfig(luajit)"
diff --git a/daemon/.packaging/fedora/31/pre-build.sh b/daemon/.packaging/fedora/31/pre-build.sh
new file mode 100755
index 0000000..7e279da
--- /dev/null
+++ b/daemon/.packaging/fedora/31/pre-build.sh
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dnf install -y wget
+
+dnf config-manager --add-repo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/Fedora_31/home:CZ-NIC:knot-resolver-build.repo
+dnf install -y knot
+dnf upgrade -y
diff --git a/daemon/.packaging/fedora/31/pre-run.sh b/daemon/.packaging/fedora/31/pre-run.sh
new file mode 100755
index 0000000..b84b42d
--- /dev/null
+++ b/daemon/.packaging/fedora/31/pre-run.sh
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dnf install -y wget
+
+dnf config-manager --add-repo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/Fedora_31/home:CZ-NIC:knot-resolver-latest.repo
+dnf upgrade -y
diff --git a/daemon/.packaging/fedora/31/rundeps b/daemon/.packaging/fedora/31/rundeps
new file mode 100644
index 0000000..7517b6b
--- /dev/null
+++ b/daemon/.packaging/fedora/31/rundeps
@@ -0,0 +1,7 @@
+libedit
+knot-libs
+libuv
+luajit
+lua5.1-basexx
+lua5.1-psl
+lua5.1-http
diff --git a/daemon/.packaging/fedora/32/builddeps b/daemon/.packaging/fedora/32/builddeps
new file mode 100644
index 0000000..984fa0b
--- /dev/null
+++ b/daemon/.packaging/fedora/32/builddeps
@@ -0,0 +1,14 @@
+gcc
+gcc-c++
+meson
+"pkgconfig(cmocka)"
+"pkgconfig(gnutls)"
+"pkgconfig(libedit)"
+"pkgconfig(libknot)"
+"pkgconfig(libzscanner)"
+"pkgconfig(libdnssec)"
+"pkgconfig(libsystemd)"
+"pkgconfig(libcap-ng)"
+"pkgconfig(libuv)"
+"pkgconfig(lmdb)"
+"pkgconfig(luajit)"
diff --git a/daemon/.packaging/fedora/32/pre-build.sh b/daemon/.packaging/fedora/32/pre-build.sh
new file mode 100755
index 0000000..97caead
--- /dev/null
+++ b/daemon/.packaging/fedora/32/pre-build.sh
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dnf install -y wget
+
+dnf config-manager --add-repo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/Fedora_32/home:CZ-NIC:knot-resolver-build.repo
+dnf install -y knot
+dnf upgrade -y
diff --git a/daemon/.packaging/fedora/32/pre-run.sh b/daemon/.packaging/fedora/32/pre-run.sh
new file mode 100755
index 0000000..b224b7e
--- /dev/null
+++ b/daemon/.packaging/fedora/32/pre-run.sh
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dnf install -y wget
+
+dnf config-manager --add-repo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/Fedora_32/home:CZ-NIC:knot-resolver-latest.repo
+dnf upgrade -y
diff --git a/daemon/.packaging/fedora/32/rundeps b/daemon/.packaging/fedora/32/rundeps
new file mode 100644
index 0000000..7517b6b
--- /dev/null
+++ b/daemon/.packaging/fedora/32/rundeps
@@ -0,0 +1,7 @@
+libedit
+knot-libs
+libuv
+luajit
+lua5.1-basexx
+lua5.1-psl
+lua5.1-http
diff --git a/daemon/.packaging/leap/15.2/builddeps b/daemon/.packaging/leap/15.2/builddeps
new file mode 100644
index 0000000..e568905
--- /dev/null
+++ b/daemon/.packaging/leap/15.2/builddeps
@@ -0,0 +1,14 @@
+gcc
+gcc-c++
+lmdb-devel
+meson
+"pkgconfig(cmocka)"
+"pkgconfig(gnutls)"
+"pkgconfig(libedit)"
+"pkgconfig(libknot)"
+"pkgconfig(libzscanner)"
+"pkgconfig(libdnssec)"
+"pkgconfig(libsystemd)"
+"pkgconfig(libcap-ng)"
+"pkgconfig(libuv)"
+"pkgconfig(luajit)"
diff --git a/daemon/.packaging/leap/15.2/pre-build.sh b/daemon/.packaging/leap/15.2/pre-build.sh
new file mode 100755
index 0000000..274931a
--- /dev/null
+++ b/daemon/.packaging/leap/15.2/pre-build.sh
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+zypper addrepo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/openSUSE_Leap_15.2/home:CZ-NIC:knot-resolver-build.repo
+zypper --no-gpg-checks refresh
+zypper install -y knot
+
diff --git a/daemon/.packaging/leap/15.2/pre-run.sh b/daemon/.packaging/leap/15.2/pre-run.sh
new file mode 100755
index 0000000..9b0b5da
--- /dev/null
+++ b/daemon/.packaging/leap/15.2/pre-run.sh
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+zypper addrepo https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/openSUSE_Leap_15.2/home:CZ-NIC:knot-resolver-latest.repo
+zypper --no-gpg-checks refresh
diff --git a/daemon/.packaging/leap/15.2/rundeps b/daemon/.packaging/leap/15.2/rundeps
new file mode 100644
index 0000000..3f601a0
--- /dev/null
+++ b/daemon/.packaging/leap/15.2/rundeps
@@ -0,0 +1,4 @@
+libedit0
+knot-libs
+libuv1
+libluajit-5_1-2
diff --git a/daemon/.packaging/leap/docker-image-name b/daemon/.packaging/leap/docker-image-name
new file mode 100644
index 0000000..388ed86
--- /dev/null
+++ b/daemon/.packaging/leap/docker-image-name
@@ -0,0 +1 @@
+opensuse/leap
diff --git a/daemon/.packaging/test.config b/daemon/.packaging/test.config
new file mode 100644
index 0000000..72ec48d
--- /dev/null
+++ b/daemon/.packaging/test.config
@@ -0,0 +1,2 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+quit()
diff --git a/daemon/.packaging/ubuntu/16.04/builddeps b/daemon/.packaging/ubuntu/16.04/builddeps
new file mode 100644
index 0000000..7b1d943
--- /dev/null
+++ b/daemon/.packaging/ubuntu/16.04/builddeps
@@ -0,0 +1,16 @@
+debhelper
+libcmocka-dev
+libedit-dev
+libgnutls28-dev
+libknot-dev
+liblmdb-dev
+libluajit-5.1-dev
+libsystemd-dev
+libuv1-dev
+luajit
+pkg-config
+meson
+doxygen
+python3-breathe
+python3-sphinx
+python3-sphinx-rtd-theme
diff --git a/daemon/.packaging/ubuntu/16.04/pre-build.sh b/daemon/.packaging/ubuntu/16.04/pre-build.sh
new file mode 100755
index 0000000..5af89ab
--- /dev/null
+++ b/daemon/.packaging/ubuntu/16.04/pre-build.sh
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-build/xUbuntu_16.04/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-build.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/xUbuntu_16.04/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/ubuntu/16.04/pre-run.sh b/daemon/.packaging/ubuntu/16.04/pre-run.sh
new file mode 100755
index 0000000..bb81453
--- /dev/null
+++ b/daemon/.packaging/ubuntu/16.04/pre-run.sh
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-latest/xUbuntu_16.04/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-latest.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/xUbuntu_16.04/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/ubuntu/16.04/rundeps b/daemon/.packaging/ubuntu/16.04/rundeps
new file mode 100644
index 0000000..a0f40c1
--- /dev/null
+++ b/daemon/.packaging/ubuntu/16.04/rundeps
@@ -0,0 +1,15 @@
+adduser
+dns-root-data
+systemd
+libc6
+libdnssec7
+libedit2
+libgcc1
+libgnutls30
+libknot10
+liblmdb0
+libluajit-5.1-2
+libstdc++6
+libsystemd0
+libuv1
+libzscanner3
diff --git a/daemon/.packaging/ubuntu/18.04/builddeps b/daemon/.packaging/ubuntu/18.04/builddeps
new file mode 100644
index 0000000..7b1d943
--- /dev/null
+++ b/daemon/.packaging/ubuntu/18.04/builddeps
@@ -0,0 +1,16 @@
+debhelper
+libcmocka-dev
+libedit-dev
+libgnutls28-dev
+libknot-dev
+liblmdb-dev
+libluajit-5.1-dev
+libsystemd-dev
+libuv1-dev
+luajit
+pkg-config
+meson
+doxygen
+python3-breathe
+python3-sphinx
+python3-sphinx-rtd-theme
diff --git a/daemon/.packaging/ubuntu/18.04/pre-build.sh b/daemon/.packaging/ubuntu/18.04/pre-build.sh
new file mode 100755
index 0000000..77551b8
--- /dev/null
+++ b/daemon/.packaging/ubuntu/18.04/pre-build.sh
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-build/xUbuntu_18.04/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-build.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/xUbuntu_18.04/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/ubuntu/18.04/pre-run.sh b/daemon/.packaging/ubuntu/18.04/pre-run.sh
new file mode 100755
index 0000000..71d2a32
--- /dev/null
+++ b/daemon/.packaging/ubuntu/18.04/pre-run.sh
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-latest/xUbuntu_18.04/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-latest.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/xUbuntu_18.04/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/ubuntu/18.04/rundeps b/daemon/.packaging/ubuntu/18.04/rundeps
new file mode 100644
index 0000000..a0f40c1
--- /dev/null
+++ b/daemon/.packaging/ubuntu/18.04/rundeps
@@ -0,0 +1,15 @@
+adduser
+dns-root-data
+systemd
+libc6
+libdnssec7
+libedit2
+libgcc1
+libgnutls30
+libknot10
+liblmdb0
+libluajit-5.1-2
+libstdc++6
+libsystemd0
+libuv1
+libzscanner3
diff --git a/daemon/.packaging/ubuntu/20.04/builddeps b/daemon/.packaging/ubuntu/20.04/builddeps
new file mode 100644
index 0000000..7b1d943
--- /dev/null
+++ b/daemon/.packaging/ubuntu/20.04/builddeps
@@ -0,0 +1,16 @@
+debhelper
+libcmocka-dev
+libedit-dev
+libgnutls28-dev
+libknot-dev
+liblmdb-dev
+libluajit-5.1-dev
+libsystemd-dev
+libuv1-dev
+luajit
+pkg-config
+meson
+doxygen
+python3-breathe
+python3-sphinx
+python3-sphinx-rtd-theme
diff --git a/daemon/.packaging/ubuntu/20.04/pre-build.sh b/daemon/.packaging/ubuntu/20.04/pre-build.sh
new file mode 100755
index 0000000..e55fba6
--- /dev/null
+++ b/daemon/.packaging/ubuntu/20.04/pre-build.sh
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-build/xUbuntu_20.04/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-build.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-build/xUbuntu_20.04/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/ubuntu/20.04/pre-run.sh b/daemon/.packaging/ubuntu/20.04/pre-run.sh
new file mode 100755
index 0000000..75c32f8
--- /dev/null
+++ b/daemon/.packaging/ubuntu/20.04/pre-run.sh
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# add build repository
+apt-get update
+apt-get install -y wget gnupg apt-utils
+
+echo 'deb http://download.opensuse.org/repositories/home:/CZ-NIC:/knot-resolver-latest/xUbuntu_20.04/ /' > /etc/apt/sources.list.d/home:CZ-NIC:knot-resolver-latest.list
+wget -nv https://download.opensuse.org/repositories/home:CZ-NIC:knot-resolver-latest/xUbuntu_20.04/Release.key -O Release.key
+apt-key add - < Release.key
+
+apt-get update
+apt-get upgrade -y
diff --git a/daemon/.packaging/ubuntu/20.04/rundeps b/daemon/.packaging/ubuntu/20.04/rundeps
new file mode 100644
index 0000000..a0f40c1
--- /dev/null
+++ b/daemon/.packaging/ubuntu/20.04/rundeps
@@ -0,0 +1,15 @@
+adduser
+dns-root-data
+systemd
+libc6
+libdnssec7
+libedit2
+libgcc1
+libgnutls30
+libknot10
+liblmdb0
+libluajit-5.1-2
+libstdc++6
+libsystemd0
+libuv1
+libzscanner3
diff --git a/daemon/bindings/api.h b/daemon/bindings/api.h
new file mode 100644
index 0000000..7ad6840
--- /dev/null
+++ b/daemon/bindings/api.h
@@ -0,0 +1,12 @@
+/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <lua.h>
+
+/** Make all the bindings accessible from the lua state,
+ * .i.e. define those lua tables. */
+void kr_bindings_register(lua_State *L);
+
diff --git a/daemon/bindings/cache.c b/daemon/bindings/cache.c
new file mode 100644
index 0000000..4a8afd9
--- /dev/null
+++ b/daemon/bindings/cache.c
@@ -0,0 +1,463 @@
+/* Copyright (C) 2015-2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/bindings/impl.h"
+
+#include "daemon/zimport.h"
+
+/** @internal return cache, or throw lua error if not open */
+static struct kr_cache * cache_assert_open(lua_State *L)
+{
+ struct kr_cache *cache = &the_worker->engine->resolver.cache;
+ assert(cache);
+ if (!cache || !kr_cache_is_open(cache))
+ lua_error_p(L, "no cache is open yet, use cache.open() or cache.size, etc.");
+ return cache;
+}
+
+/** Return available cached backends. */
+static int cache_backends(lua_State *L)
+{
+ struct engine *engine = the_worker->engine;
+
+ lua_newtable(L);
+ for (unsigned i = 0; i < engine->backends.len; ++i) {
+ const struct kr_cdb_api *api = engine->backends.at[i];
+ lua_pushboolean(L, api == engine->resolver.cache.api);
+ lua_setfield(L, -2, api->name);
+ }
+ return 1;
+}
+
+/** Return number of cached records. */
+static int cache_count(lua_State *L)
+{
+ struct kr_cache *cache = cache_assert_open(L);
+
+ int count = cache->api->count(cache->db, &cache->stats);
+ if (count >= 0) {
+ /* First key is a version counter, omit it if nonempty. */
+ lua_pushinteger(L, count ? count - 1 : 0);
+ return 1;
+ }
+ return 0;
+}
+
+/** Return time of last checkpoint, or re-set it if passed `true`. */
+static int cache_checkpoint(lua_State *L)
+{
+ struct kr_cache *cache = cache_assert_open(L);
+
+ if (lua_gettop(L) == 0) { /* Return the current value. */
+ lua_newtable(L);
+ lua_pushnumber(L, cache->checkpoint_monotime);
+ lua_setfield(L, -2, "monotime");
+ lua_newtable(L);
+ lua_pushnumber(L, cache->checkpoint_walltime.tv_sec);
+ lua_setfield(L, -2, "sec");
+ lua_pushnumber(L, cache->checkpoint_walltime.tv_usec);
+ lua_setfield(L, -2, "usec");
+ lua_setfield(L, -2, "walltime");
+ return 1;
+ }
+
+ if (lua_gettop(L) != 1 || !lua_isboolean(L, 1) || !lua_toboolean(L, 1))
+ lua_error_p(L, "cache.checkpoint() takes no parameters or a true value");
+
+ kr_cache_make_checkpoint(cache);
+ return 1;
+}
+
+/** Return cache statistics. */
+static int cache_stats(lua_State *L)
+{
+ struct kr_cache *cache = cache_assert_open(L);
+ lua_newtable(L);
+#define add_stat(name) \
+ lua_pushinteger(L, (cache->stats.name)); \
+ lua_setfield(L, -2, #name)
+ add_stat(open);
+ add_stat(close);
+ add_stat(count);
+ cache->stats.count_entries = cache->api->count(cache->db, &cache->stats);
+ add_stat(count_entries);
+ add_stat(clear);
+ add_stat(commit);
+ add_stat(read);
+ add_stat(read_miss);
+ add_stat(write);
+ add_stat(remove);
+ add_stat(remove_miss);
+ add_stat(match);
+ add_stat(match_miss);
+ add_stat(read_leq);
+ add_stat(read_leq_miss);
+ /* usage_percent statistics special case - double */
+ cache->stats.usage_percent = cache->api->usage_percent(cache->db);
+ lua_pushnumber(L, cache->stats.usage_percent);
+ lua_setfield(L, -2, "usage_percent");
+#undef add_stat
+
+ return 1;
+}
+
+static const struct kr_cdb_api *cache_select(struct engine *engine, const char **conf)
+{
+ /* Return default backend */
+ if (*conf == NULL || !strstr(*conf, "://")) {
+ return engine->backends.at[0];
+ }
+
+ /* Find storage backend from config prefix */
+ for (unsigned i = 0; i < engine->backends.len; ++i) {
+ const struct kr_cdb_api *api = engine->backends.at[i];
+ if (strncmp(*conf, api->name, strlen(api->name)) == 0) {
+ *conf += strlen(api->name) + strlen("://");
+ return api;
+ }
+ }
+
+ return NULL;
+}
+
+static int cache_max_ttl(lua_State *L)
+{
+ struct kr_cache *cache = cache_assert_open(L);
+
+ int n = lua_gettop(L);
+ if (n > 0) {
+ if (!lua_isnumber(L, 1) || n > 1)
+ lua_error_p(L, "expected 'max_ttl(number ttl)'");
+ uint32_t min = cache->ttl_min;
+ int64_t ttl = lua_tointeger(L, 1);
+ if (ttl < 1 || ttl < min || ttl > UINT32_MAX) {
+ lua_error_p(L,
+ "max_ttl must be larger than minimum TTL, and in range <1, "
+ STR(UINT32_MAX) ">'");
+ }
+ cache->ttl_max = ttl;
+ }
+ lua_pushinteger(L, cache->ttl_max);
+ return 1;
+}
+
+
+static int cache_min_ttl(lua_State *L)
+{
+ struct kr_cache *cache = cache_assert_open(L);
+
+ int n = lua_gettop(L);
+ if (n > 0) {
+ if (!lua_isnumber(L, 1))
+ lua_error_p(L, "expected 'min_ttl(number ttl)'");
+ uint32_t max = cache->ttl_max;
+ int64_t ttl = lua_tointeger(L, 1);
+ if (ttl < 0 || ttl > max || ttl > UINT32_MAX) {
+ lua_error_p(L,
+ "min_ttl must be smaller than maximum TTL, and in range <0, "
+ STR(UINT32_MAX) ">'");
+ }
+ cache->ttl_min = ttl;
+ }
+ lua_pushinteger(L, cache->ttl_min);
+ return 1;
+}
+
+/** Open cache */
+static int cache_open(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 1 || !lua_isnumber(L, 1))
+ lua_error_p(L, "expected 'open(number max_size, string config = \"\")'");
+
+ /* Select cache storage backend */
+ struct engine *engine = the_worker->engine;
+
+ lua_Integer csize_lua = lua_tointeger(L, 1);
+ if (!(csize_lua >= 8192 && csize_lua < SIZE_MAX)) { /* min. is basically arbitrary */
+ lua_error_p(L, "invalid cache size specified, it must be in range <8192, "
+ STR(SIZE_MAX) ">");
+ }
+ size_t cache_size = csize_lua;
+
+ const char *conf = n > 1 ? lua_tostring(L, 2) : NULL;
+ const char *uri = conf;
+ const struct kr_cdb_api *api = cache_select(engine, &conf);
+ if (!api)
+ lua_error_p(L, "unsupported cache backend");
+
+ /* Close if already open */
+ kr_cache_close(&engine->resolver.cache);
+
+ /* Reopen cache */
+ struct kr_cdb_opts opts = {
+ (conf && strlen(conf)) ? conf : ".",
+ cache_size
+ };
+ int ret = kr_cache_open(&engine->resolver.cache, api, &opts, engine->pool);
+ if (ret != 0) {
+ char cwd[PATH_MAX];
+ get_workdir(cwd, sizeof(cwd));
+ return luaL_error(L, "can't open cache path '%s'; working directory '%s'; %s",
+ opts.path, cwd, kr_strerror(ret));
+ }
+ /* Let's check_health() every five seconds to avoid keeping old cache alive
+ * even in case of not having any work to do. */
+ ret = kr_cache_check_health(&engine->resolver.cache, 5000);
+ if (ret != 0) {
+ kr_log_error("[cache] periodic health check failed (ignored): %s\n",
+ kr_strerror(ret));
+ }
+
+ /* Store current configuration */
+ lua_getglobal(L, "cache");
+ lua_pushstring(L, "current_size");
+ lua_pushnumber(L, cache_size);
+ lua_rawset(L, -3);
+ lua_pushstring(L, "current_storage");
+ lua_pushstring(L, uri);
+ lua_rawset(L, -3);
+ lua_pop(L, 1);
+
+ lua_pushboolean(L, 1);
+ return 1;
+}
+
+static int cache_close(lua_State *L)
+{
+ struct kr_cache *cache = &the_worker->engine->resolver.cache;
+ if (!kr_cache_is_open(cache)) {
+ return 0;
+ }
+
+ kr_cache_close(cache);
+ lua_getglobal(L, "cache");
+ lua_pushstring(L, "current_size");
+ lua_pushnumber(L, 0);
+ lua_rawset(L, -3);
+ lua_pop(L, 1);
+ lua_pushboolean(L, 1);
+ return 1;
+}
+
+#if 0
+/** @internal Prefix walk. */
+static int cache_prefixed(struct kr_cache *cache, const char *prefix, bool exact_name,
+ knot_db_val_t keyval[][2], int maxcount)
+{
+ /* Convert to domain name */
+ uint8_t buf[KNOT_DNAME_MAXLEN];
+ if (!knot_dname_from_str(buf, prefix, sizeof(buf))) {
+ return kr_error(EINVAL);
+ }
+ /* Start prefix search */
+ return kr_cache_match(cache, buf, exact_name, keyval, maxcount);
+}
+#endif
+
+/** Clear everything. */
+static int cache_clear_everything(lua_State *L)
+{
+ struct kr_cache *cache = cache_assert_open(L);
+
+ /* Clear records and packets. */
+ int ret = kr_cache_clear(cache);
+ lua_error_maybe(L, ret);
+
+ /* Clear reputation tables */
+ struct kr_context *ctx = &the_worker->engine->resolver;
+ lru_reset(ctx->cache_cookie);
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+#if 0
+/** @internal Dump cache key into table on Lua stack. */
+static void cache_dump(lua_State *L, knot_db_val_t keyval[])
+{
+ knot_dname_t dname[KNOT_DNAME_MAXLEN];
+ char name[KNOT_DNAME_TXT_MAXLEN];
+ uint16_t type;
+
+ int ret = kr_unpack_cache_key(keyval[0], dname, &type);
+ if (ret < 0) {
+ return;
+ }
+
+ ret = !knot_dname_to_str(name, dname, sizeof(name));
+ assert(!ret);
+ if (ret) return;
+
+ /* If name typemap doesn't exist yet, create it */
+ lua_getfield(L, -1, name);
+ if (lua_isnil(L, -1)) {
+ lua_pop(L, 1);
+ lua_newtable(L);
+ }
+ /* Append to typemap */
+ char type_buf[KR_RRTYPE_STR_MAXLEN] = { '\0' };
+ knot_rrtype_to_string(type, type_buf, sizeof(type_buf));
+ lua_pushboolean(L, true);
+ lua_setfield(L, -2, type_buf);
+ /* Set name typemap */
+ lua_setfield(L, -2, name);
+}
+
+/** Query cached records. TODO: fix caveats in ./README.rst documentation? */
+static int cache_get(lua_State *L)
+{
+ //struct kr_cache *cache = cache_assert_open(L); // to be fixed soon
+
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 1 || !lua_isstring(L, 1))
+ lua_error_p(L, "expected 'cache.get(string key)'");
+
+ /* Retrieve set of keys */
+ const char *prefix = lua_tostring(L, 1);
+ knot_db_val_t keyval[100][2];
+ int ret = cache_prefixed(cache, prefix, false/*FIXME*/, keyval, 100);
+ lua_error_maybe(L, ret);
+ /* Format output */
+ lua_newtable(L);
+ for (int i = 0; i < ret; ++i) {
+ cache_dump(L, keyval[i]);
+ }
+ return 1;
+}
+#endif
+static int cache_get(lua_State *L)
+{
+ lua_error_maybe(L, ENOSYS);
+ return kr_error(ENOSYS); /* doesn't happen */
+}
+
+/** Set time interval for cleaning rtt cache.
+ * Servers with score >= KR_NS_TIMEOUT will be cleaned after
+ * this interval ended up, so that they will be able to participate
+ * in NS elections again. */
+static int cache_ns_tout(lua_State *L)
+{
+ struct kr_context *ctx = &the_worker->engine->resolver;
+
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 1) {
+ lua_pushinteger(L, ctx->cache_rtt_tout_retry_interval);
+ return 1;
+ }
+
+ if (!lua_isnumber(L, 1))
+ lua_error_p(L, "expected 'cache.ns_tout(interval in ms)'");
+
+ lua_Integer interval_lua = lua_tointeger(L, 1);
+ if (!(interval_lua > 0 && interval_lua < UINT_MAX)) {
+ lua_error_p(L, "invalid interval specified, it must be in range > 0, < "
+ STR(UINT_MAX));
+ }
+
+ ctx->cache_rtt_tout_retry_interval = interval_lua;
+ lua_pushinteger(L, ctx->cache_rtt_tout_retry_interval);
+ return 1;
+}
+
+/** Zone import completion callback.
+ * Deallocates zone import context. */
+static void cache_zone_import_cb(int state, void *param)
+{
+ assert (param);
+ (void)state;
+ struct worker_ctx *worker = (struct worker_ctx *)param;
+ assert (worker->z_import);
+ zi_free(worker->z_import);
+ worker->z_import = NULL;
+}
+
+/** Import zone from file. */
+static int cache_zone_import(lua_State *L)
+{
+ int ret = -1;
+ char msg[128];
+
+ struct worker_ctx *worker = the_worker;
+ if (!worker) {
+ strncpy(msg, "internal error, empty worker pointer", sizeof(msg));
+ goto finish;
+ }
+
+ if (worker->z_import && zi_import_started(worker->z_import)) {
+ strncpy(msg, "import already started", sizeof(msg));
+ goto finish;
+ }
+
+ (void)cache_assert_open(L); /* just check it in advance */
+
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 1 || !lua_isstring(L, 1)) {
+ strncpy(msg, "expected 'cache.zone_import(path to zone file)'", sizeof(msg));
+ goto finish;
+ }
+
+ /* Parse zone file */
+ const char *zone_file = lua_tostring(L, 1);
+
+ const char *default_origin = NULL; /* TODO */
+ uint16_t default_rclass = 1;
+ uint32_t default_ttl = 0;
+
+ if (worker->z_import == NULL) {
+ worker->z_import = zi_allocate(worker, cache_zone_import_cb, worker);
+ if (worker->z_import == NULL) {
+ strncpy(msg, "can't allocate zone import context", sizeof(msg));
+ goto finish;
+ }
+ }
+
+ ret = zi_zone_import(worker->z_import, zone_file, default_origin,
+ default_rclass, default_ttl);
+
+ lua_newtable(L);
+ if (ret == 0) {
+ strncpy(msg, "zone file successfully parsed, import started", sizeof(msg));
+ } else if (ret == 1) {
+ strncpy(msg, "TA not found", sizeof(msg));
+ } else {
+ strncpy(msg, "error parsing zone file", sizeof(msg));
+ }
+
+finish:
+ msg[sizeof(msg) - 1] = 0;
+ lua_newtable(L);
+ lua_pushstring(L, msg);
+ lua_setfield(L, -2, "msg");
+ lua_pushnumber(L, ret);
+ lua_setfield(L, -2, "code");
+
+ return 1;
+}
+
+int kr_bindings_cache(lua_State *L)
+{
+ static const luaL_Reg lib[] = {
+ { "backends", cache_backends },
+ { "count", cache_count },
+ { "stats", cache_stats },
+ { "checkpoint", cache_checkpoint },
+ { "open", cache_open },
+ { "close", cache_close },
+ { "clear_everything", cache_clear_everything },
+ { "get", cache_get },
+ { "max_ttl", cache_max_ttl },
+ { "min_ttl", cache_min_ttl },
+ { "ns_tout", cache_ns_tout },
+ { "zone_import", cache_zone_import },
+ { NULL, NULL }
+ };
+
+ luaL_register(L, "cache", lib);
+ return 1;
+}
+
diff --git a/daemon/bindings/cache.rst b/daemon/bindings/cache.rst
new file mode 100644
index 0000000..e295d22
--- /dev/null
+++ b/daemon/bindings/cache.rst
@@ -0,0 +1,340 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+Cache
+=====
+
+Cache in Knot Resolver is stored on disk and also shared between
+:ref:`systemd-multiple-instances` so resolver doesn't lose the cached data on
+restart or crash.
+
+To improve performance even further the resolver implements so-called aggressive caching
+for DNSSEC-validated data (:rfc:`8198`), which improves performance and also protects
+against some types of Random Subdomain Attacks.
+
+
+.. _`cache_sizing`:
+
+Sizing
+------
+
+For personal and small office use-cases cache size around 100 MB is more than enough.
+
+For large deployments we recommend to run Knot Resolver on a dedicated machine,
+and to allocate 90% of machine's free memory for resolver's cache.
+
+.. note:: Choosing a cache size that can fit into RAM is important even if the
+ cache is stored on disk (default). Otherwise, the extra I/O caused by disk
+ access for missing pages can cause performance issues.
+
+For example, imagine you have a machine with 16 GB of memory.
+After machine restart you use command ``free -m`` to determine
+amount of free memory (without swap):
+
+.. code-block:: bash
+
+ $ free -m
+ total used free
+ Mem: 15907 979 14928
+
+Now you can configure cache size to be 90% of the free memory 14 928 MB, i.e. 13 453 MB:
+
+.. code-block:: lua
+
+ -- 90 % of free memory after machine restart
+ cache.size = 13453 * MB
+
+It is also possible to set the cache size based on the file system size. This is useful
+if you use a dedicated partition for cache (e.g. non-persistent tmpfs). It is recommended
+to leave some free space for special files, such as locks.:
+
+.. code-block:: lua
+
+ cache.size = cache.fssize() - 10*MB
+
+.. note:: The :ref:`garbage-collector` can be used to periodically trim the
+ cache. It is enabled and configured by default when running kresd with
+ systemd integration.
+
+.. _`cache_persistence`:
+
+Persistence
+-----------
+.. tip:: Using tmpfs for cache improves performance and reduces disk I/O.
+
+By default the cache is saved on a persistent storage device
+so the content of the cache is persisted during system reboot.
+This usually leads to smaller latency after restart etc.,
+however in certain situations a non-persistent cache storage might be preferred, e.g.:
+
+ - Resolver handles high volume of queries and I/O performance to disk is too low.
+ - Threat model includes attacker getting access to disk content in power-off state.
+ - Disk has limited number of writes (e.g. flash memory in routers).
+
+If non-persistent cache is desired configure cache directory to be on
+tmpfs_ filesystem, a temporary in-memory file storage.
+The cache content will be saved in memory, and thus have faster access
+and will be lost on power-off or reboot.
+
+
+.. note:: In most of the Unix-like systems ``/tmp`` and ``/var/run`` are
+ commonly mounted as tmpfs. While it is technically possible to move the
+ cache to an existing tmpfs filesystem, it is *not recommended*, since the
+ path to cache is configured in multiple places.
+
+Mounting the cache directory as tmpfs_ is the recommended approach. Make sure
+to use appropriate ``size=`` option and don't forget to adjust the size in the
+config file as well.
+
+.. code-block:: none
+
+ # /etc/fstab
+ tmpfs /var/cache/knot-resolver tmpfs rw,size=2G,uid=knot-resolver,gid=knot-resolver,nosuid,nodev,noexec,mode=0700 0 0
+
+.. code-block:: lua
+
+ -- /etc/knot-resolver/kresd.conf
+ cache.size = cache.fssize() - 10*MB
+
+.. _tmpfs: https://en.wikipedia.org/wiki/Tmpfs
+
+Configuration reference
+-----------------------
+
+.. function:: cache.open(max_size[, config_uri])
+
+ :param number max_size: Maximum cache size in bytes.
+ :return: ``true`` if cache was opened
+
+ Open cache with a size limit. The cache will be reopened if already open.
+ Note that the max_size cannot be lowered, only increased due to how cache is implemented.
+
+ .. tip:: Use ``kB, MB, GB`` constants as a multiplier, e.g. ``100*MB``.
+
+ The URI ``lmdb://path`` allows you to change the cache directory.
+
+ Example:
+
+ .. code-block:: lua
+
+ cache.open(100 * MB, 'lmdb:///var/cache/knot-resolver')
+
+.. envvar:: cache.size
+
+ Set the cache maximum size in bytes. Note that this is only a hint to the backend,
+ which may or may not respect it. See :func:`cache.open()`.
+
+ .. code-block:: lua
+
+ cache.size = 100 * MB -- equivalent to `cache.open(100 * MB)`
+
+.. envvar:: cache.current_size
+
+ Get the maximum size in bytes.
+
+ .. code-block:: lua
+
+ print(cache.current_size)
+
+.. envvar:: cache.storage
+
+ Set the cache storage backend configuration, see :func:`cache.backends()` for
+ more information. If the new storage configuration is invalid, it is not set.
+
+ .. code-block:: lua
+
+ cache.storage = 'lmdb://.'
+
+.. envvar:: cache.current_storage
+
+ Get the storage backend configuration.
+
+ .. code-block:: lua
+
+ print(cache.current_storage)
+
+.. function:: cache.backends()
+
+ :return: map of backends
+
+ .. note:: For now there is only one backend implementation, even though the APIs are ready for different (synchronous) backends.
+
+ The cache supports runtime-changeable backends, using the optional :rfc:`3986` URI, where the scheme
+ represents backend protocol and the rest of the URI backend-specific configuration. By default, it
+ is a ``lmdb`` backend in working directory, i.e. ``lmdb://``.
+
+ Example output:
+
+ .. code-block:: lua
+
+ [lmdb://] => true
+
+.. function:: cache.count()
+
+ :return: Number of entries in the cache. Meaning of the number is an implementation detail and is subject of change.
+
+.. function:: cache.close()
+
+ :return: ``true`` if cache was closed
+
+ Close the cache.
+
+ .. note:: This may or may not clear the cache, depending on the cache backend.
+
+.. function:: cache.fssize()
+
+ :return: Partition size of cache storage.
+
+.. function:: cache.stats()
+
+ Return table with low-level statistics for internal cache operation and storage.
+ This counts each access to cache and does not directly map to individual
+ DNS queries or resource records.
+ For query-level statistics see :ref:`stats module <mod-stats>`.
+
+ Example:
+
+ .. code-block:: lua
+
+ > cache.stats()
+ [clear] => 0
+ [close] => 0
+ [commit] => 117
+ [count] => 2
+ [count_entries] => 6187
+ [match] => 21
+ [match_miss] => 2
+ [open] => 0
+ [read] => 4313
+ [read_leq] => 9
+ [read_leq_miss] => 4
+ [read_miss] => 1143
+ [remove] => 17
+ [remove_miss] => 0
+ [usage_percent] => 15.625
+ [write] => 189
+
+
+ Cache operation `read_leq` (*read less or equal*, i.e. range search) was requested 9 times,
+ and 4 out of 9 operations were finished with *cache miss*.
+ Cache contains 6187 internal entries which occupy 15.625 % cache size.
+
+
+.. function:: cache.max_ttl([ttl])
+
+ :param number ttl: maximum cache TTL in seconds (default: 6 days)
+
+ .. KR_CACHE_DEFAULT_TTL_MAX ^^
+
+ :return: current maximum TTL
+
+ Get or set maximum cache TTL.
+
+ .. note:: The `ttl` value must be in range `(min_ttl, 4294967295)`.
+
+ .. warning:: This settings applies only to currently open cache, it will not persist if the cache is closed or reopened.
+
+ .. code-block:: lua
+
+ -- Get maximum TTL
+ cache.max_ttl()
+ 518400
+ -- Set maximum TTL
+ cache.max_ttl(172800)
+ 172800
+
+.. function:: cache.min_ttl([ttl])
+
+ :param number ttl: minimum cache TTL in seconds (default: 5 seconds)
+
+ .. KR_CACHE_DEFAULT_TTL_MIN ^^
+
+ :return: current maximum TTL
+
+ Get or set minimum cache TTL. Any entry inserted into cache with TTL lower than minimal will be overridden to minimum TTL. Forcing TTL higher than specified violates DNS standards, use with care.
+
+ .. note:: The `ttl` value must be in range `<0, max_ttl)`.
+
+ .. warning:: This settings applies only to currently open cache, it will not persist if the cache is closed or reopened.
+
+ .. code-block:: lua
+
+ -- Get minimum TTL
+ cache.min_ttl()
+ 0
+ -- Set minimum TTL
+ cache.min_ttl(5)
+ 5
+
+.. function:: cache.ns_tout([timeout])
+
+ :param number timeout: NS retry interval in milliseconds (default: :c:macro:`KR_NS_TIMEOUT_RETRY_INTERVAL`)
+ :return: current timeout
+
+ Get or set time interval for which a nameserver address will be ignored after determining that it doesn't return (useful) answers.
+ The intention is to avoid waiting if there's little hope; instead, kresd can immediately SERVFAIL or immediately use stale records (with :ref:`serve_stale <mod-serve_stale>` module).
+
+ .. warning:: This settings applies only to the current kresd process.
+
+.. function:: cache.get([domain])
+
+ This function is not implemented at this moment.
+ We plan to re-introduce it soon, probably with a slightly different API.
+
+.. function:: cache.clear([name], [exact_name], [rr_type], [chunk_size], [callback], [prev_state])
+
+ Purge cache records matching specified criteria. There are two specifics:
+
+ * To reliably remove **negative** cache entries you need to clear subtree with the whole zone. E.g. to clear negative cache entries for (formerly non-existing) record `www.example.com. A` you need to flush whole subtree starting at zone apex, e.g. `example.com.` [#]_.
+ * This operation is asynchronous and might not be yet finished when call to ``cache.clear()`` function returns. Return value indicates if clearing continues asynchronously or not.
+
+ :param string name: subtree to purge; if the name isn't provided, whole cache is purged
+ (and any other parameters are disregarded).
+ :param bool exact_name: if set to ``true``, only records with *the same* name are removed;
+ default: false.
+ :param kres.type rr_type: you may additionally specify the type to remove,
+ but that is only supported with ``exact_name == true``; default: nil.
+ :param integer chunk_size: the number of records to remove in one round; default: 100.
+ The purpose is not to block the resolver for long.
+ The default ``callback`` repeats the command after one millisecond
+ until all matching data are cleared.
+ :param function callback: a custom code to handle result of the underlying C call.
+ Its parameters are copies of those passed to `cache.clear()` with one additional
+ parameter ``rettable`` containing table with return value from current call.
+ ``count`` field contains a return code from :func:`kr_cache_remove_subtree()`.
+ :param table prev_state: return value from previous run (can be used by callback)
+
+ :rtype: table
+ :return: ``count`` key is always present. Other keys are optional and their presence indicate special conditions.
+
+ * **count** *(integer)* - number of items removed from cache by this call (can be 0 if no entry matched criteria)
+ * **not_apex** - cleared subtree is not cached as zone apex; proofs of non-existence were probably not removed
+ * **subtree** *(string)* - hint where zone apex lies (this is estimation from cache content and might not be accurate)
+ * **chunk_limit** - more than ``chunk_size`` items needs to be cleared, clearing will continue asynchronously
+
+
+ Examples:
+
+ .. code-block:: lua
+
+ -- Clear whole cache
+ > cache.clear()
+ [count] => 76
+
+ -- Clear records at and below 'com.'
+ > cache.clear('com.')
+ [chunk_limit] => chunk size limit reached; the default callback will continue asynchronously
+ [not_apex] => to clear proofs of non-existence call cache.clear('com.')
+ [count] => 100
+ [round] => 1
+ [subtree] => com.
+ > worker.sleep(0.1)
+ [cache] asynchonous cache.clear('com', false) finished
+
+ -- Clear only 'www.example.com.'
+ > cache.clear('www.example.com.', true)
+ [round] => 1
+ [count] => 1
+ [not_apex] => to clear proofs of non-existence call cache.clear('example.com.')
+ [subtree] => example.com.
+
+.. [#] This is a consequence of DNSSEC negative cache which relies on proofs of non-existence on various owner nodes. It is impossible to efficiently flush part of DNS zones signed with NSEC3.
diff --git a/daemon/bindings/event.c b/daemon/bindings/event.c
new file mode 100644
index 0000000..0c5a6ba
--- /dev/null
+++ b/daemon/bindings/event.c
@@ -0,0 +1,209 @@
+/* Copyright (C) 2015-2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/bindings/impl.h"
+
+#include <unistd.h>
+#include <uv.h>
+
+static void event_free(uv_timer_t *timer)
+{
+ lua_State *L = the_worker->engine->L;
+ int ref = (intptr_t) timer->data;
+ luaL_unref(L, LUA_REGISTRYINDEX, ref);
+ free(timer);
+}
+
+static void event_callback(uv_timer_t *timer)
+{
+ lua_State *L = the_worker->engine->L;
+
+ /* Retrieve callback and execute */
+ lua_rawgeti(L, LUA_REGISTRYINDEX, (intptr_t) timer->data);
+ lua_rawgeti(L, -1, 1);
+ lua_pushinteger(L, (intptr_t) timer->data);
+ int ret = execute_callback(L, 1);
+ /* Free callback if not recurrent or an error */
+ if (ret != 0 || (uv_timer_get_repeat(timer) == 0 && uv_is_active((uv_handle_t *)timer) == 0)) {
+ if (!uv_is_closing((uv_handle_t *)timer)) {
+ uv_close((uv_handle_t *)timer, (uv_close_cb) event_free);
+ }
+ }
+}
+
+static void event_fdcallback(uv_poll_t* handle, int status, int events)
+{
+ lua_State *L = the_worker->engine->L;
+
+ /* Retrieve callback and execute */
+ lua_rawgeti(L, LUA_REGISTRYINDEX, (intptr_t) handle->data);
+ lua_rawgeti(L, -1, 1);
+ lua_pushinteger(L, (intptr_t) handle->data);
+ lua_pushinteger(L, status);
+ lua_pushinteger(L, events);
+ int ret = execute_callback(L, 3);
+ /* Free callback if not recurrent or an error */
+ if (ret != 0) {
+ if (!uv_is_closing((uv_handle_t *)handle)) {
+ uv_close((uv_handle_t *)handle, (uv_close_cb) event_free);
+ }
+ }
+}
+
+static int event_sched(lua_State *L, unsigned timeout, unsigned repeat)
+{
+ uv_timer_t *timer = malloc(sizeof(*timer));
+ if (!timer)
+ lua_error_p(L, "out of memory");
+
+ /* Start timer with the reference */
+ uv_loop_t *loop = uv_default_loop();
+ uv_timer_init(loop, timer);
+ int ret = uv_timer_start(timer, event_callback, timeout, repeat);
+ if (ret != 0) {
+ free(timer);
+ lua_error_p(L, "couldn't start the event");
+ }
+
+ /* Save callback and timer in registry */
+ lua_newtable(L);
+ lua_pushvalue(L, 2);
+ lua_rawseti(L, -2, 1);
+ lua_pushpointer(L, timer);
+ lua_rawseti(L, -2, 2);
+ int ref = luaL_ref(L, LUA_REGISTRYINDEX);
+
+ /* Save reference to the timer */
+ timer->data = (void *) (intptr_t)ref;
+ lua_pushinteger(L, ref);
+ return 1;
+}
+
+static int event_after(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 2 || !lua_isnumber(L, 1) || !lua_isfunction(L, 2))
+ lua_error_p(L, "expected 'after(number timeout, function)'");
+
+ return event_sched(L, lua_tointeger(L, 1), 0);
+}
+
+static int event_recurrent(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 2 || !lua_isnumber(L, 1) || lua_tointeger(L, 1) == 0
+ || !lua_isfunction(L, 2))
+ lua_error_p(L, "expected 'recurrent(number interval, function)'");
+
+ return event_sched(L, 0, lua_tointeger(L, 1));
+}
+
+static int event_cancel(lua_State *L)
+{
+ int n = lua_gettop(L);
+ if (n < 1 || !lua_isnumber(L, 1))
+ lua_error_p(L, "expected 'cancel(number event)'");
+
+ /* Fetch event if it exists */
+ lua_rawgeti(L, LUA_REGISTRYINDEX, lua_tointeger(L, 1));
+ bool ok = lua_istable(L, -1);
+
+ /* Close the timer */
+ uv_handle_t **timer_pp = NULL;
+ if (ok) {
+ lua_rawgeti(L, -1, 2);
+ timer_pp = lua_touserdata(L, -1);
+ ok = timer_pp && *timer_pp;
+ /* That have been sufficient safety checks, hopefully. */
+ }
+ if (ok && !uv_is_closing(*timer_pp)) {
+ uv_close(*timer_pp, (uv_close_cb)event_free);
+ }
+ lua_pushboolean(L, ok);
+ return 1;
+}
+
+static int event_reschedule(lua_State *L)
+{
+ int n = lua_gettop(L);
+ if (n < 2 || !lua_isnumber(L, 1) || !lua_isnumber(L, 2))
+ lua_error_p(L, "expected 'reschedule(number event, number timeout)'");
+
+ /* Fetch event if it exists */
+ lua_rawgeti(L, LUA_REGISTRYINDEX, lua_tointeger(L, 1));
+ bool ok = lua_istable(L, -1);
+
+ /* Reschedule the timer */
+ uv_handle_t **timer_pp = NULL;
+ if (ok) {
+ lua_rawgeti(L, -1, 2);
+ timer_pp = lua_touserdata(L, -1);
+ ok = timer_pp && *timer_pp;
+ /* That have been sufficient safety checks, hopefully. */
+ }
+ if (ok && !uv_is_closing(*timer_pp)) {
+ int ret = uv_timer_start((uv_timer_t *)*timer_pp,
+ event_callback, lua_tointeger(L, 2), 0);
+ if (ret != 0) {
+ uv_close(*timer_pp, (uv_close_cb)event_free);
+ ok = false;
+ }
+ }
+ lua_pushboolean(L, ok);
+ return 1;
+}
+
+static int event_fdwatch(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 2 || !lua_isnumber(L, 1) || !lua_isfunction(L, 2))
+ lua_error_p(L, "expected 'socket(number fd, function)'");
+
+ uv_poll_t *handle = malloc(sizeof(*handle));
+ if (!handle)
+ lua_error_p(L, "out of memory");
+
+ /* Start timer with the reference */
+ int sock = lua_tointeger(L, 1);
+ uv_loop_t *loop = uv_default_loop();
+ int ret = uv_poll_init(loop, handle, sock);
+ if (ret == 0)
+ ret = uv_poll_start(handle, UV_READABLE, event_fdcallback);
+ if (ret != 0) {
+ free(handle);
+ lua_error_p(L, "couldn't start event poller");
+ }
+
+ /* Save callback and timer in registry */
+ lua_newtable(L);
+ lua_pushvalue(L, 2);
+ lua_rawseti(L, -2, 1);
+ lua_pushpointer(L, handle);
+ lua_rawseti(L, -2, 2);
+ int ref = luaL_ref(L, LUA_REGISTRYINDEX);
+
+ /* Save reference to the timer */
+ handle->data = (void *) (intptr_t)ref;
+ lua_pushinteger(L, ref);
+ return 1;
+}
+
+int kr_bindings_event(lua_State *L)
+{
+ static const luaL_Reg lib[] = {
+ { "after", event_after },
+ { "recurrent", event_recurrent },
+ { "cancel", event_cancel },
+ { "socket", event_fdwatch },
+ { "reschedule", event_reschedule },
+ { NULL, NULL }
+ };
+
+ luaL_register(L, "event", lib);
+ return 1;
+}
+
diff --git a/daemon/bindings/event.rst b/daemon/bindings/event.rst
new file mode 100644
index 0000000..bb8abcd
--- /dev/null
+++ b/daemon/bindings/event.rst
@@ -0,0 +1,139 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+Timers and events reference
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The timer represents exactly the thing described in the examples - it allows you to execute closures_
+after specified time, or event recurrent events. Time is always described in milliseconds,
+but there are convenient variables that you can use - ``sec, minute, hour``.
+For example, ``5 * hour`` represents five hours, or 5*60*60*100 milliseconds.
+
+.. function:: event.after(time, function)
+
+ :return: event id
+
+ Execute function after the specified time has passed.
+ The first parameter of the callback is the event itself.
+
+ Example:
+
+ .. code-block:: lua
+
+ event.after(1 * minute, function() print('Hi!') end)
+
+.. function:: event.recurrent(interval, function)
+
+ :return: event id
+
+ Execute function immediatelly and then periodically after each ``interval``.
+
+ Example:
+
+ .. code-block:: lua
+
+ msg_count = 0
+ event.recurrent(5 * sec, function(e)
+ msg_count = msg_count + 1
+ print('Hi #'..msg_count)
+ end)
+
+.. function:: event.reschedule(event_id, timeout)
+
+ Reschedule a running event, it has no effect on canceled events.
+ New events may reuse the event_id, so the behaviour is undefined if the function
+ is called after another event is started.
+
+ Example:
+
+ .. code-block:: lua
+
+ local interval = 1 * minute
+ event.after(1 * minute, function (ev)
+ print('Good morning!')
+ -- Halven the interval for each iteration
+ interval = interval / 2
+ event.reschedule(ev, interval)
+ end)
+
+.. function:: event.cancel(event_id)
+
+ Cancel running event, it has no effect on already canceled events.
+ New events may reuse the event_id, so the behaviour is undefined if the function
+ is called after another event is started.
+
+ Example:
+
+ .. code-block:: lua
+
+ e = event.after(1 * minute, function() print('Hi!') end)
+ event.cancel(e)
+
+Watch for file descriptor activity. This allows embedding other event loops or simply
+firing events when a pipe endpoint becomes active. In another words, asynchronous
+notifications for daemon.
+
+.. function:: event.socket(fd, cb)
+
+ :param number fd: file descriptor to watch
+ :param cb: closure or callback to execute when fd becomes active
+ :return: event id
+
+ Execute function when there is activity on the file descriptor and calls a closure
+ with event id as the first parameter, status as second and number of events as third.
+
+ Example:
+
+ .. code-block:: lua
+
+ e = event.socket(0, function(e, status, nevents)
+ print('activity detected')
+ end)
+ e.cancel(e)
+
+Asynchronous function execution
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The `event` package provides a very basic mean for non-blocking execution - it allows running code when activity on a file descriptor is detected, and when a certain amount of time passes. It doesn't however provide an easy to use abstraction for non-blocking I/O. This is instead exposed through the `worker` package (if `cqueues` Lua package is installed in the system).
+
+.. function:: worker.coroutine(function)
+
+ Start a new coroutine with given function (closure). The function can do I/O or run timers without blocking the main thread. See cqueues_ for documentation of possible operations and synchronization primitives. The main limitation is that you can't wait for a finish of a coroutine from processing layers, because it's not currently possible to suspend and resume execution of processing layers.
+
+ Example:
+
+ .. code-block:: lua
+
+ worker.coroutine(function ()
+ for i = 0, 10 do
+ print('executing', i)
+ worker.sleep(1)
+ end
+ end)
+
+.. function:: worker.sleep(seconds)
+
+ Pause execution of current function (asynchronously if running inside a worker coroutine).
+
+Example:
+
+.. code-block:: lua
+
+ function async_print(testname, sleep)
+ log(testname .. ': system time before sleep' .. tostring(os.time())
+ worker.sleep(sleep) -- other corroutines continue execution now
+ log(testname .. ': system time AFTER sleep' .. tostring(os.time())
+ end
+
+ worker.coroutine(function() async_print('call #1', 5) end)
+ worker.coroutine(function() async_print('call #2', 3) end)
+
+Output from this example demonstrates that both calls to function ``async_print`` were executed asynchronously:
+
+
+.. code-block:: none
+
+ call #2: system time before sleep 1578065073
+ call #1: system time before sleep 1578065073
+ call #2: system time AFTER sleep 1578065076
+ call #1: system time AFTER sleep 1578065078
+
diff --git a/daemon/bindings/impl.c b/daemon/bindings/impl.c
new file mode 100644
index 0000000..6f1383c
--- /dev/null
+++ b/daemon/bindings/impl.c
@@ -0,0 +1,95 @@
+/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <dirent.h>
+#include <lua.h>
+#include <lauxlib.h>
+#include <string.h>
+
+
+const char * lua_table_checkindices(lua_State *L, const char *keys[])
+{
+ /* Iterate over table at the top of the stack.
+ * http://www.lua.org/manual/5.1/manual.html#lua_next */
+ for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
+ lua_pop(L, 1); /* we don't need the value */
+ /* We need to copy the key, as _tostring() confuses _next().
+ * https://www.lua.org/manual/5.1/manual.html#lua_tolstring */
+ lua_pushvalue(L, -1);
+ const char *key = lua_tostring(L, -1);
+ if (!key)
+ return "<NON-STRING_INDEX>";
+ for (const char **k = keys; ; ++k) {
+ if (*k == NULL)
+ return key;
+ if (strcmp(*k, key) == 0)
+ break;
+ }
+ }
+ return NULL;
+}
+
+/** Return table listing filenames in a given directory (ls -A). */
+static int kluautil_list_dir(lua_State *L)
+{
+ lua_newtable(L); // empty table even on errors
+
+ const char *path = lua_tolstring(L, 1, NULL);
+ if (!path) return 1;
+ DIR *dir = opendir(path);
+ if (!dir) return 1;
+
+ struct dirent *entry;
+ int lua_i = 1;
+ while ((entry = readdir(dir)) != NULL) {
+ if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) {
+ lua_pushstring(L, entry->d_name);
+ lua_rawseti(L, -2, lua_i++);
+ }
+ }
+
+ closedir(dir);
+ return 1;
+}
+
+
+/* Each of these just creates the correspondingly named lua table of functions. */
+int kr_bindings_cache (lua_State *L); /* ./cache.c */
+int kr_bindings_event (lua_State *L); /* ./event.c */
+int kr_bindings_modules (lua_State *L); /* ./modules.c */
+int kr_bindings_net (lua_State *L); /* ./net.c */
+int kr_bindings_worker (lua_State *L); /* ./worker.c */
+
+void kr_bindings_register(lua_State *L)
+{
+ kr_bindings_cache(L);
+ kr_bindings_event(L);
+ kr_bindings_modules(L);
+ kr_bindings_net(L);
+ kr_bindings_worker(L);
+
+ /* Finally some lua utils *written in C*, not really a binding. */
+ lua_register(L, "kluautil_list_dir", kluautil_list_dir);
+}
+
+void lua_error_p(lua_State *L, const char *fmt, ...)
+{
+ /* Add a stack trace and throw the result as a lua error. */
+ luaL_traceback(L, L, "error occurred here (config filename:lineno is at the bottom, if config is involved):", 0);
+ /* Push formatted custom message, prepended with "ERROR: ". */
+ lua_pushliteral(L, "\nERROR: ");
+ {
+ va_list args;
+ va_start(args, fmt);
+ lua_pushvfstring(L, fmt, args);
+ va_end(args);
+ }
+ lua_concat(L, 3);
+ lua_error(L);
+ /* TODO: we might construct a little more friendly trace by using luaL_where().
+ * In particular, in case the error happens in a function that was called
+ * directly from a config file (the most common case), there isn't much need
+ * to format the trace in this heavy way. */
+}
+
diff --git a/daemon/bindings/impl.h b/daemon/bindings/impl.h
new file mode 100644
index 0000000..9c9e893
--- /dev/null
+++ b/daemon/bindings/impl.h
@@ -0,0 +1,90 @@
+/* Copyright (C) 2015-2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "daemon/engine.h"
+#include "daemon/worker.h" /* the_worker is often useful */
+
+#include <lua.h>
+#include <lauxlib.h>
+/* It may happen that include files are messed up and we're hitting a header
+ * e.g. from vanilla Lua. Even 5.1 won't work due to missing luaL_traceback() in <lauxlib.h>. */
+#if (LUA_VERSION_NUM) != 501 || !defined(LUA_LJDIR)
+ #error "Incorrect Lua version in #include <lua.h> - LuaJIT compatible with Lua 5.1 is required"
+#endif
+
+
+/** Useful to stringify macros into error strings. */
+#define STR(s) STRINGIFY_TOKEN(s)
+#define STRINGIFY_TOKEN(s) #s
+
+
+/** Check lua table at the top of the stack for allowed keys.
+ * \param keys NULL-terminated array of 0-terminated strings
+ * \return NULL if passed or the offending string (pushed on top of lua stack)
+ * \note Future work: if non-NULL is returned, there's extra stuff on the lua stack.
+ * \note Brute-force complexity: table length * summed length of keys.
+ */
+const char * lua_table_checkindices(lua_State *L, const char *keys[]);
+
+/** If the value at the top of the stack isn't a table, make it a single-element list. */
+static inline void lua_listify(lua_State *L)
+{
+ if (lua_istable(L, -1))
+ return;
+ lua_createtable(L, 1, 0);
+ lua_insert(L, lua_gettop(L) - 1); /* swap the top two stack elements */
+ lua_pushinteger(L, 1);
+ lua_insert(L, lua_gettop(L) - 1); /* swap the top two stack elements */
+ lua_settable(L, -3);
+}
+
+
+/** Throw a formatted lua error.
+ *
+ * The message will get prefixed by "ERROR: " and supplemented by stack trace.
+ * \return never! It calls lua_error().
+ *
+ * Example:
+ ERROR: not a valid pin_sha256: 'a1Z/3ek=', raw length 5 instead of 32
+ stack traceback:
+ [C]: in function 'tls_client'
+ /PathToPREFIX/lib/kdns_modules/policy.lua:175: in function 'TLS_FORWARD'
+ /PathToConfig.lua:46: in main chunk
+ */
+KR_PRINTF(2) KR_NORETURN KR_COLD
+void lua_error_p(lua_State *L, const char *fmt, ...);
+/** @internal Annotate for static checkers. */
+KR_NORETURN int lua_error(lua_State *L);
+
+/** Shortcut for common case. */
+static inline void lua_error_maybe(lua_State *L, int err)
+{
+ if (err) lua_error_p(L, "%s", kr_strerror(err));
+}
+
+static inline int execute_callback(lua_State *L, int argc)
+{
+ int ret = engine_pcall(L, argc);
+ if (ret != 0) {
+ kr_log_error("error: %s\n", lua_tostring(L, -1));
+ }
+ /* Clear the stack, there may be event a/o enything returned */
+ lua_settop(L, 0);
+ return ret;
+}
+
+/** Push a pointer as heavy/full userdata.
+ *
+ * It's useful as a replacement of lua_pushlightuserdata(),
+ * but note that it behaves differently in lua (converts to pointer-to-pointer).
+ */
+static inline void lua_pushpointer(lua_State *L, void *p)
+{
+ void *addr = lua_newuserdata(L, sizeof(void *));
+ assert(addr);
+ memcpy(addr, &p, sizeof(void *));
+}
+
diff --git a/daemon/bindings/modules.c b/daemon/bindings/modules.c
new file mode 100644
index 0000000..5116ff3
--- /dev/null
+++ b/daemon/bindings/modules.c
@@ -0,0 +1,77 @@
+/* Copyright (C) 2015-2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/bindings/impl.h"
+
+
+/** List loaded modules */
+static int mod_list(lua_State *L)
+{
+ const module_array_t * const modules = &the_worker->engine->modules;
+ lua_newtable(L);
+ for (unsigned i = 0; i < modules->len; ++i) {
+ struct kr_module *module = modules->at[i];
+ lua_pushstring(L, module->name);
+ lua_rawseti(L, -2, i + 1);
+ }
+ return 1;
+}
+
+/** Load module. */
+static int mod_load(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n != 1 || !lua_isstring(L, 1))
+ lua_error_p(L, "expected 'load(string name)'");
+ /* Parse precedence declaration */
+ char *declaration = strdup(lua_tostring(L, 1));
+ if (!declaration)
+ return kr_error(ENOMEM);
+ const char *name = strtok(declaration, " ");
+ const char *precedence = strtok(NULL, " ");
+ const char *ref = strtok(NULL, " ");
+ /* Load engine module */
+ int ret = engine_register(the_worker->engine, name, precedence, ref);
+ free(declaration);
+ if (ret != 0) {
+ if (ret == kr_error(EIDRM)) {
+ lua_error_p(L, "referenced module not found");
+ } else {
+ lua_error_maybe(L, ret);
+ }
+ }
+
+ lua_pushboolean(L, 1);
+ return 1;
+}
+
+/** Unload module. */
+static int mod_unload(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n != 1 || !lua_isstring(L, 1))
+ lua_error_p(L, "expected 'unload(string name)'");
+ /* Unload engine module */
+ int ret = engine_unregister(the_worker->engine, lua_tostring(L, 1));
+ lua_error_maybe(L, ret);
+
+ lua_pushboolean(L, 1);
+ return 1;
+}
+
+int kr_bindings_modules(lua_State *L)
+{
+ static const luaL_Reg lib[] = {
+ { "list", mod_list },
+ { "load", mod_load },
+ { "unload", mod_unload },
+ { NULL, NULL }
+ };
+
+ luaL_register(L, "modules", lib);
+ return 1;
+}
+
diff --git a/daemon/bindings/modules.rst b/daemon/bindings/modules.rst
new file mode 100644
index 0000000..09df6ff
--- /dev/null
+++ b/daemon/bindings/modules.rst
@@ -0,0 +1,43 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+Modules
+=======
+
+Knot Resolver functionality consists of separate modules, which allow you
+to mix-and-match features you need without slowing down operation
+by features you do not use.
+
+This practically means that you need to load module before using features contained in it, for example:
+
+.. code-block:: lua
+
+ -- load module and make dnstap features available
+ modules.load('dnstap')
+ -- configure dnstap features
+ dnstap.config({
+ socket_path = "/tmp/dnstap.sock"
+ })
+
+Obviously ordering matters, so you have to load module first and configure it after it is loaded.
+
+Here is full reference manual for module configuration:
+
+
+.. function:: modules.list()
+
+ :return: List of loaded modules.
+
+.. function:: modules.load(name)
+
+ :param string name: Module name, e.g. "hints"
+ :return: ``true`` if modules was (or already is) loaded, error otherwise.
+
+ Load a module by name.
+
+.. function:: modules.unload(name)
+
+ :param string name: Module name, e.g. "detect_time_jump"
+ :return: ``true`` if modules was unloaded, error otherwise.
+
+ Unload a module by name. This is useful for unloading modules loaded by default, mainly for debugging purposes.
+
diff --git a/daemon/bindings/net.c b/daemon/bindings/net.c
new file mode 100644
index 0000000..37ae240
--- /dev/null
+++ b/daemon/bindings/net.c
@@ -0,0 +1,1091 @@
+/* Copyright (C) 2015-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/bindings/impl.h"
+
+#include "contrib/base64.h"
+#include "daemon/network.h"
+#include "daemon/tls.h"
+
+#include <stdlib.h>
+
+/** Table and next index on top of stack -> append entries for given endpoint_array_t. */
+static int net_list_add(const char *key, void *val, void *ext)
+{
+ lua_State *L = (lua_State *)ext;
+ lua_Integer i = lua_tointeger(L, -1);
+ endpoint_array_t *ep_array = val;
+ for (int j = 0; j < ep_array->len; ++j) {
+ struct endpoint *ep = &ep_array->at[j];
+ lua_newtable(L); // connection tuple
+
+ if (ep->flags.kind) {
+ lua_pushstring(L, ep->flags.kind);
+ } else if (ep->flags.http && ep->flags.tls) {
+ lua_pushliteral(L, "doh2");
+ } else if (ep->flags.tls) {
+ lua_pushliteral(L, "tls");
+ } else if (ep->flags.xdp) {
+ lua_pushliteral(L, "xdp");
+ } else {
+ lua_pushliteral(L, "dns");
+ }
+ lua_setfield(L, -2, "kind");
+
+ lua_newtable(L); // "transport" table
+
+ switch (ep->family) {
+ case AF_INET:
+ lua_pushliteral(L, "inet4");
+ break;
+ case AF_INET6:
+ lua_pushliteral(L, "inet6");
+ break;
+ case AF_XDP:
+ lua_pushliteral(L, "inet4+inet6"); // both UDP ports at once
+ break;
+ case AF_UNIX:
+ lua_pushliteral(L, "unix");
+ break;
+ default:
+ lua_pushliteral(L, "invalid");
+ assert(!EINVAL);
+ }
+ lua_setfield(L, -2, "family");
+
+ lua_pushstring(L, key);
+ if (ep->family == AF_INET || ep->family == AF_INET6) {
+ lua_setfield(L, -2, "ip");
+ lua_pushboolean(L, ep->flags.freebind);
+ lua_setfield(L, -2, "freebind");
+ } else if (ep->family == AF_UNIX) {
+ lua_setfield(L, -2, "path");
+ } else if (ep->family == AF_XDP) {
+ lua_setfield(L, -2, "interface");
+ lua_pushinteger(L, ep->nic_queue);
+ lua_setfield(L, -2, "nic_queue");
+ }
+
+ if (ep->family != AF_UNIX) {
+ lua_pushinteger(L, ep->port);
+ lua_setfield(L, -2, "port");
+ }
+
+ if (ep->family == AF_UNIX) {
+ lua_pushliteral(L, "stream");
+ } else if (ep->flags.sock_type == SOCK_STREAM) {
+ lua_pushliteral(L, "tcp");
+ } else if (ep->flags.sock_type == SOCK_DGRAM) {
+ lua_pushliteral(L, "udp");
+ } else {
+ assert(!EINVAL);
+ lua_pushliteral(L, "invalid");
+ }
+ lua_setfield(L, -2, "protocol");
+
+ lua_setfield(L, -2, "transport");
+
+ lua_settable(L, -3);
+ i++;
+ lua_pushinteger(L, i);
+ }
+ return kr_ok();
+}
+
+/** List active endpoints. */
+static int net_list(lua_State *L)
+{
+ lua_newtable(L);
+ lua_pushinteger(L, 1);
+ map_walk(&the_worker->engine->net.endpoints, net_list_add, L);
+ lua_pop(L, 1);
+ return 1;
+}
+
+/** Listen on an address list represented by the top of lua stack.
+ * \note flags.kind ownership is not transferred, and flags.sock_type doesn't make sense
+ * \return success */
+static bool net_listen_addrs(lua_State *L, int port, endpoint_flags_t flags, int16_t nic_queue)
+{
+ assert(flags.xdp || nic_queue == -1);
+
+ /* Case: table with 'addr' field; only follow that field directly. */
+ lua_getfield(L, -1, "addr");
+ if (!lua_isnil(L, -1)) {
+ lua_replace(L, -2);
+ } else {
+ lua_pop(L, 1);
+ }
+
+ /* Case: string, representing a single address. */
+ const char *str = lua_tostring(L, -1);
+ if (str != NULL) {
+ struct network *net = &the_worker->engine->net;
+ const bool is_unix = str[0] == '/';
+ int ret = 0;
+ if (!flags.kind && !flags.tls) { /* normal UDP or XDP */
+ flags.sock_type = SOCK_DGRAM;
+ ret = network_listen(net, str, port, nic_queue, flags);
+ }
+ if (!flags.kind && !flags.xdp && ret == 0) { /* common for TCP, DoT and DoH (v2) */
+ flags.sock_type = SOCK_STREAM;
+ ret = network_listen(net, str, port, nic_queue, flags);
+ }
+ if (flags.kind) {
+ flags.kind = strdup(flags.kind);
+ flags.sock_type = SOCK_STREAM; /* TODO: allow to override this? */
+ ret = network_listen(net, str, (is_unix ? 0 : port), nic_queue, flags);
+ }
+ if (ret == 0) return true; /* success */
+
+ if (is_unix) {
+ kr_log_error("[system] bind to '%s' (UNIX): %s\n",
+ str, kr_strerror(ret));
+ } else if (flags.xdp) {
+ const char *err_str = knot_strerror(ret);
+ if (ret == KNOT_ELIMIT) {
+ if ((strcmp(str, "::") == 0 || strcmp(str, "0.0.0.0") == 0)) {
+ err_str = "wildcard addresses not supported with XDP";
+ } else {
+ err_str = "address matched multiple network interfaces";
+ }
+ } else if (ret == kr_error(ENODEV)) {
+ err_str = "invalid address or interface name";
+ }
+ /* Notable OK strerror: KNOT_EPERM Operation not permitted */
+
+ if (nic_queue == -1) {
+ kr_log_error("[system] failed to initialize XDP for '%s@%d'"
+ " (nic_queue = <auto>): %s\n",
+ str, port, err_str);
+ } else {
+ kr_log_error("[system] failed to initialize XDP for '%s@%d'"
+ " (nic_queue = %d): %s\n",
+ str, port, nic_queue, err_str);
+ }
+
+ } else {
+ const char *stype = flags.sock_type == SOCK_DGRAM ? "UDP" : "TCP";
+ kr_log_error("[system] bind to '%s@%d' (%s): %s\n",
+ str, port, stype, kr_strerror(ret));
+ }
+ return false; /* failure */
+ }
+
+ /* Last case: table where all entries are added recursively. */
+ if (!lua_istable(L, -1))
+ lua_error_p(L, "bad type for address");
+ lua_pushnil(L);
+ while (lua_next(L, -2)) {
+ if (!net_listen_addrs(L, port, flags, nic_queue))
+ return false;
+ lua_pop(L, 1);
+ }
+ return true;
+}
+
+static bool table_get_flag(lua_State *L, int index, const char *key, bool def)
+{
+ bool result = def;
+ lua_getfield(L, index, key);
+ if (lua_isboolean(L, -1)) {
+ result = lua_toboolean(L, -1);
+ }
+ lua_pop(L, 1);
+ return result;
+}
+
+/** Listen on endpoint. */
+static int net_listen(lua_State *L)
+{
+ /* Check parameters */
+ int n = lua_gettop(L);
+ if (n < 1 || n > 3) {
+ lua_error_p(L, "expected one to three arguments; usage:\n"
+ "net.listen(addressses, [port = " STR(KR_DNS_PORT)
+ ", flags = {tls = (port == " STR(KR_DNS_TLS_PORT) ")}])\n");
+ }
+
+ int port = KR_DNS_PORT;
+ if (n > 1) {
+ if (lua_isnumber(L, 2)) {
+ port = lua_tointeger(L, 2);
+ } else
+ if (!lua_isnil(L, 2)) {
+ lua_error_p(L, "wrong type of second parameter (port number)");
+ }
+ }
+
+ endpoint_flags_t flags = { 0 };
+ if (port == KR_DNS_TLS_PORT) {
+ flags.tls = true;
+ } else if (port == KR_DNS_DOH_PORT) {
+ flags.http = flags.tls = true;
+ }
+
+ int16_t nic_queue = -1;
+ if (n > 2 && !lua_isnil(L, 3)) {
+ if (!lua_istable(L, 3))
+ lua_error_p(L, "wrong type of third parameter (table expected)");
+ flags.tls = table_get_flag(L, 3, "tls", flags.tls);
+ flags.freebind = table_get_flag(L, 3, "freebind", false);
+
+ lua_getfield(L, 3, "kind");
+ const char *k = lua_tostring(L, -1);
+ if (k && strcasecmp(k, "dns") == 0) {
+ flags.tls = flags.http = false;
+ } else if (k && strcasecmp(k, "xdp") == 0) {
+ flags.tls = flags.http = false;
+ flags.xdp = true;
+ } else if (k && strcasecmp(k, "tls") == 0) {
+ flags.tls = true;
+ flags.http = false;
+ } else if (k && strcasecmp(k, "doh2") == 0) {
+ flags.tls = flags.http = true;
+ } else if (k) {
+ flags.kind = k;
+ if (strcasecmp(k, "doh") == 0) {
+ kr_log_deprecate(
+ "kind=\"doh\" is an obsolete DoH implementation, use kind=\"doh2\" instead\n");
+ }
+ }
+
+ lua_getfield(L, 3, "nic_queue");
+ if (lua_isnumber(L, -1)) {
+ if (flags.xdp) {
+ nic_queue = lua_tointeger(L, -1);
+ } else {
+ lua_error_p(L, "nic_queue only supported with kind = 'xdp'");
+ }
+ } else if (!lua_isnil(L, -1)) {
+ lua_error_p(L, "wrong value of nic_queue (integer expected)");
+ }
+ }
+
+ /* Memory management of `kind` string is difficult due to longjmp etc.
+ * Pop will unreference the lua value, so we store it on C stack instead (!) */
+ const int kind_alen = flags.kind ? strlen(flags.kind) + 1 : 1 /* 0 length isn't C standard */;
+ char kind_buf[kind_alen];
+ if (flags.kind) {
+ memcpy(kind_buf, flags.kind, kind_alen);
+ flags.kind = kind_buf;
+ }
+
+ /* Now focus on the first argument. */
+ lua_settop(L, 1);
+ if (!net_listen_addrs(L, port, flags, nic_queue))
+ lua_error_p(L, "net.listen() failed to bind");
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+/** Close endpoint. */
+static int net_close(lua_State *L)
+{
+ /* Check parameters */
+ const int n = lua_gettop(L);
+ bool ok = (n == 1 || n == 2) && lua_isstring(L, 1);
+ const char *addr = lua_tostring(L, 1);
+ int port;
+ if (ok && (n < 2 || lua_isnil(L, 2))) {
+ port = -1;
+ } else if (ok) {
+ ok = lua_isnumber(L, 2);
+ port = lua_tointeger(L, 2);
+ ok = ok && port >= 0 && port <= 65535;
+ }
+ if (!ok)
+ lua_error_p(L, "expected 'close(string addr, [number port])'");
+
+ int ret = network_close(&the_worker->engine->net, addr, port);
+ lua_pushboolean(L, ret == 0);
+ return 1;
+}
+
+/** List available interfaces. */
+static int net_interfaces(lua_State *L)
+{
+ /* Retrieve interface list */
+ int count = 0;
+ char buf[INET6_ADDRSTRLEN]; /* https://tools.ietf.org/html/rfc4291 */
+ uv_interface_address_t *info = NULL;
+ uv_interface_addresses(&info, &count);
+ lua_newtable(L);
+ for (int i = 0; i < count; ++i) {
+ uv_interface_address_t iface = info[i];
+ lua_getfield(L, -1, iface.name);
+ if (lua_isnil(L, -1)) {
+ lua_pop(L, 1);
+ lua_newtable(L);
+ }
+
+ /* Address */
+ lua_getfield(L, -1, "addr");
+ if (lua_isnil(L, -1)) {
+ lua_pop(L, 1);
+ lua_newtable(L);
+ }
+ if (iface.address.address4.sin_family == AF_INET) {
+ uv_ip4_name(&iface.address.address4, buf, sizeof(buf));
+ } else if (iface.address.address4.sin_family == AF_INET6) {
+ uv_ip6_name(&iface.address.address6, buf, sizeof(buf));
+ } else {
+ buf[0] = '\0';
+ }
+ lua_pushstring(L, buf);
+ lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
+ lua_setfield(L, -2, "addr");
+
+ /* Hardware address. */
+ char *p = buf;
+ for (int k = 0; k < sizeof(iface.phys_addr); ++k) {
+ sprintf(p, "%.2x:", (uint8_t)iface.phys_addr[k]);
+ p += 3;
+ }
+ p[-1] = '\0';
+ lua_pushstring(L, buf);
+ lua_setfield(L, -2, "mac");
+
+ /* Push table */
+ lua_setfield(L, -2, iface.name);
+ }
+ uv_free_interface_addresses(info, count);
+
+ return 1;
+}
+
+/** Set UDP maximum payload size. */
+static int net_bufsize(lua_State *L)
+{
+ struct kr_context *ctx = &the_worker->engine->resolver;
+ const int argc = lua_gettop(L);
+ if (argc == 0) {
+ lua_pushinteger(L, knot_edns_get_payload(ctx->downstream_opt_rr));
+ lua_pushinteger(L, knot_edns_get_payload(ctx->upstream_opt_rr));
+ return 2;
+ }
+
+ if (argc == 1) {
+ int bufsize = lua_tointeger(L, 1);
+ if (bufsize < 512 || bufsize > UINT16_MAX)
+ lua_error_p(L, "bufsize must be within <512, " STR(UINT16_MAX) ">");
+ knot_edns_set_payload(ctx->downstream_opt_rr, (uint16_t)bufsize);
+ knot_edns_set_payload(ctx->upstream_opt_rr, (uint16_t)bufsize);
+ } else if (argc == 2) {
+ int bufsize_downstream = lua_tointeger(L, 1);
+ int bufsize_upstream = lua_tointeger(L, 2);
+ if (bufsize_downstream < 512 || bufsize_upstream < 512
+ || bufsize_downstream > UINT16_MAX || bufsize_upstream > UINT16_MAX) {
+ lua_error_p(L, "bufsize must be within <512, " STR(UINT16_MAX) ">");
+ }
+ knot_edns_set_payload(ctx->downstream_opt_rr, (uint16_t)bufsize_downstream);
+ knot_edns_set_payload(ctx->upstream_opt_rr, (uint16_t)bufsize_upstream);
+ }
+ return 0;
+}
+
+/** Set TCP pipelining size. */
+static int net_pipeline(lua_State *L)
+{
+ struct worker_ctx *worker = the_worker;
+ if (!worker) {
+ return 0;
+ }
+ if (!lua_isnumber(L, 1)) {
+ lua_pushinteger(L, worker->tcp_pipeline_max);
+ return 1;
+ }
+ int len = lua_tointeger(L, 1);
+ if (len < 0 || len > UINT16_MAX)
+ lua_error_p(L, "tcp_pipeline must be within <0, " STR(UINT16_MAX) ">");
+ worker->tcp_pipeline_max = len;
+ lua_pushinteger(L, len);
+ return 1;
+}
+
+static int net_tls(lua_State *L)
+{
+ struct network *net = &the_worker->engine->net;
+ if (!net) {
+ return 0;
+ }
+
+ /* Only return current credentials. */
+ if (lua_gettop(L) == 0) {
+ /* No credentials configured yet. */
+ if (!net->tls_credentials) {
+ return 0;
+ }
+ lua_newtable(L);
+ lua_pushstring(L, net->tls_credentials->tls_cert);
+ lua_setfield(L, -2, "cert_file");
+ lua_pushstring(L, net->tls_credentials->tls_key);
+ lua_setfield(L, -2, "key_file");
+ return 1;
+ }
+
+ if ((lua_gettop(L) != 2) || !lua_isstring(L, 1) || !lua_isstring(L, 2))
+ lua_error_p(L, "net.tls takes two parameters: (\"cert_file\", \"key_file\")");
+
+ int r = tls_certificate_set(net, lua_tostring(L, 1), lua_tostring(L, 2));
+ lua_error_maybe(L, r);
+
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+/** Return a lua table with TLS authentication parameters.
+ * The format is the same as passed to policy.TLS_FORWARD();
+ * more precisely, it's in a compatible canonical form. */
+static int tls_params2lua(lua_State *L, trie_t *params)
+{
+ lua_newtable(L);
+ if (!params) /* Allowed special case. */
+ return 1;
+ trie_it_t *it;
+ size_t list_index = 0;
+ for (it = trie_it_begin(params); !trie_it_finished(it); trie_it_next(it)) {
+ /* Prepare table for the current address
+ * and its index in the returned list. */
+ lua_pushinteger(L, ++list_index);
+ lua_createtable(L, 0, 2);
+
+ /* Get the "addr#port" string... */
+ size_t ia_len;
+ const char *key = trie_it_key(it, &ia_len);
+ int af = AF_UNSPEC;
+ if (ia_len == 2 + sizeof(struct in_addr)) {
+ af = AF_INET;
+ } else if (ia_len == 2 + sizeof(struct in6_addr)) {
+ af = AF_INET6;
+ }
+ if (!key || af == AF_UNSPEC) {
+ assert(false);
+ lua_error_p(L, "internal error: bad IP address");
+ }
+ uint16_t port;
+ memcpy(&port, key, sizeof(port));
+ port = ntohs(port);
+ const char *ia = key + sizeof(port);
+ char str[INET6_ADDRSTRLEN + 1 + 5 + 1];
+ size_t len = sizeof(str);
+ if (kr_ntop_str(af, ia, port, str, &len) != kr_ok()) {
+ assert(false);
+ lua_error_p(L, "internal error: bad IP address conversion");
+ }
+ /* ...and push it as [1]. */
+ lua_pushinteger(L, 1);
+ lua_pushlstring(L, str, len - 1 /* len includes '\0' */);
+ lua_settable(L, -3);
+
+ const tls_client_param_t *e = *trie_it_val(it);
+ if (!e)
+ lua_error_p(L, "internal problem - NULL entry for %s", str);
+
+ /* .hostname = */
+ if (e->hostname) {
+ lua_pushstring(L, e->hostname);
+ lua_setfield(L, -2, "hostname");
+ }
+
+ /* .ca_files = */
+ if (e->ca_files.len) {
+ lua_createtable(L, e->ca_files.len, 0);
+ for (size_t i = 0; i < e->ca_files.len; ++i) {
+ lua_pushinteger(L, i + 1);
+ lua_pushstring(L, e->ca_files.at[i]);
+ lua_settable(L, -3);
+ }
+ lua_setfield(L, -2, "ca_files");
+ }
+
+ /* .pin_sha256 = ... ; keep sane indentation via goto. */
+ if (!e->pins.len) goto no_pins;
+ lua_createtable(L, e->pins.len, 0);
+ for (size_t i = 0; i < e->pins.len; ++i) {
+ uint8_t pin_base64[TLS_SHA256_BASE64_BUFLEN];
+ int err = kr_base64_encode(e->pins.at[i], TLS_SHA256_RAW_LEN,
+ pin_base64, sizeof(pin_base64));
+ if (err < 0) {
+ assert(false);
+ lua_error_p(L,
+ "internal problem when converting pin_sha256: %s",
+ kr_strerror(err));
+ }
+ lua_pushinteger(L, i + 1);
+ lua_pushlstring(L, (const char *)pin_base64, err);
+ /* pin_base64 isn't 0-terminated ^^^ */
+ lua_settable(L, -3);
+ }
+ lua_setfield(L, -2, "pin_sha256");
+
+ no_pins:/* .insecure = */
+ if (e->insecure) {
+ lua_pushboolean(L, true);
+ lua_setfield(L, -2, "insecure");
+ }
+ /* Now the whole table is pushed atop the returned list. */
+ lua_settable(L, -3);
+ }
+ trie_it_free(it);
+ return 1;
+}
+
+static inline int cmp_sha256(const void *p1, const void *p2)
+{
+ return memcmp(*(char * const *)p1, *(char * const *)p2, TLS_SHA256_RAW_LEN);
+}
+static int net_tls_client(lua_State *L)
+{
+ /* TODO idea: allow starting the lua table with *multiple* IP targets,
+ * meaning the authentication config should be applied to each.
+ */
+ struct network *net = &the_worker->engine->net;
+ if (lua_gettop(L) == 0)
+ return tls_params2lua(L, net->tls_client_params);
+ /* Various basic sanity-checking. */
+ if (lua_gettop(L) != 1 || !lua_istable(L, 1))
+ lua_error_maybe(L, EINVAL);
+ /* check that only allowed keys are present */
+ {
+ const char *bad_key = lua_table_checkindices(L, (const char *[])
+ { "1", "hostname", "ca_file", "pin_sha256", "insecure", NULL });
+ if (bad_key)
+ lua_error_p(L, "found unexpected key '%s'", bad_key);
+ }
+
+ /**** Phase 1: get the parameter into a C struct, incl. parse of CA files,
+ * regardless of the address-pair having an entry already. */
+
+ tls_client_param_t *newcfg = tls_client_param_new();
+ if (!newcfg)
+ lua_error_p(L, "out of memory or something like that :-/");
+ /* Shortcut for cleanup actions needed from now on. */
+ #define ERROR(...) do { \
+ free(newcfg); \
+ lua_error_p(L, __VA_ARGS__); \
+ } while (false)
+
+ /* .hostname - always accepted. */
+ lua_getfield(L, 1, "hostname");
+ if (!lua_isnil(L, -1)) {
+ const char *hn_str = lua_tostring(L, -1);
+ /* Convert to lower-case dname and back, for checking etc. */
+ knot_dname_t dname[KNOT_DNAME_MAXLEN];
+ if (!hn_str || !knot_dname_from_str(dname, hn_str, sizeof(dname)))
+ ERROR("invalid hostname");
+ knot_dname_to_lower(dname);
+ char *h = knot_dname_to_str_alloc(dname);
+ if (!h)
+ ERROR("%s", kr_strerror(ENOMEM));
+ /* Strip the final dot produced by knot_dname_*() */
+ h[strlen(h) - 1] = '\0';
+ newcfg->hostname = h;
+ }
+ lua_pop(L, 1);
+
+ /* .ca_file - it can be a list of paths, contrary to the name. */
+ bool has_ca_file = false;
+ lua_getfield(L, 1, "ca_file");
+ if (!lua_isnil(L, -1)) {
+ if (!newcfg->hostname)
+ ERROR("missing hostname but specifying ca_file");
+ lua_listify(L);
+ array_init(newcfg->ca_files); /*< placate apparently confused scan-build */
+ if (array_reserve(newcfg->ca_files, lua_objlen(L, -1)) != 0) /*< optim. */
+ ERROR("%s", kr_strerror(ENOMEM));
+ /* Iterate over table at the top of the stack.
+ * http://www.lua.org/manual/5.1/manual.html#lua_next */
+ for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
+ has_ca_file = true; /* deferred here so that {} -> false */
+ const char *ca_file = lua_tostring(L, -1);
+ if (!ca_file)
+ ERROR("ca_file contains a non-string");
+ /* Let gnutls process it immediately, so garbage gets detected. */
+ int ret = gnutls_certificate_set_x509_trust_file(
+ newcfg->credentials, ca_file, GNUTLS_X509_FMT_PEM);
+ if (ret < 0) {
+ ERROR("failed to import certificate file '%s': %s - %s\n",
+ ca_file, gnutls_strerror_name(ret),
+ gnutls_strerror(ret));
+ } else {
+ kr_log_verbose(
+ "[tls_client] imported %d certs from file '%s'\n",
+ ret, ca_file);
+ }
+
+ ca_file = strdup(ca_file);
+ if (!ca_file || array_push(newcfg->ca_files, ca_file) < 0)
+ ERROR("%s", kr_strerror(ENOMEM));
+ }
+ /* Sort the strings for easier comparison later. */
+ if (newcfg->ca_files.len) {
+ qsort(&newcfg->ca_files.at[0], newcfg->ca_files.len,
+ sizeof(newcfg->ca_files.at[0]), strcmp_p);
+ }
+ }
+ lua_pop(L, 1);
+
+ /* .pin_sha256 */
+ lua_getfield(L, 1, "pin_sha256");
+ if (!lua_isnil(L, -1)) {
+ if (has_ca_file)
+ ERROR("mixing pin_sha256 with ca_file is not supported");
+ lua_listify(L);
+ array_init(newcfg->pins); /*< placate apparently confused scan-build */
+ if (array_reserve(newcfg->pins, lua_objlen(L, -1)) != 0) /*< optim. */
+ ERROR("%s", kr_strerror(ENOMEM));
+ /* Iterate over table at the top of the stack. */
+ for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
+ const char *pin = lua_tostring(L, -1);
+ if (!pin)
+ ERROR("pin_sha256 is not a string");
+ uint8_t *pin_raw = malloc(TLS_SHA256_RAW_LEN);
+ /* Push the string early to simplify error processing. */
+ if (!pin_raw || array_push(newcfg->pins, pin_raw) < 0) {
+ assert(false);
+ free(pin_raw);
+ ERROR("%s", kr_strerror(ENOMEM));
+ }
+ int ret = kr_base64_decode((const uint8_t *)pin, strlen(pin),
+ pin_raw, TLS_SHA256_RAW_LEN + 8);
+ if (ret < 0) {
+ ERROR("not a valid pin_sha256: '%s' (length %d), %s\n",
+ pin, (int)strlen(pin), knot_strerror(ret));
+ } else if (ret != TLS_SHA256_RAW_LEN) {
+ ERROR("not a valid pin_sha256: '%s', "
+ "raw length %d instead of "
+ STR(TLS_SHA256_RAW_LEN)"\n",
+ pin, ret);
+ }
+ }
+ /* Sort the raw strings for easier comparison later. */
+ if (newcfg->pins.len) {
+ qsort(&newcfg->pins.at[0], newcfg->pins.len,
+ sizeof(newcfg->pins.at[0]), cmp_sha256);
+ }
+ }
+ lua_pop(L, 1);
+
+ /* .insecure */
+ lua_getfield(L, 1, "insecure");
+ if (lua_isnil(L, -1)) {
+ if (!newcfg->hostname && !newcfg->pins.len)
+ ERROR("no way to authenticate and not set as insecure");
+ } else if (lua_isboolean(L, -1) && lua_toboolean(L, -1)) {
+ newcfg->insecure = true;
+ if (has_ca_file || newcfg->pins.len)
+ ERROR("set as insecure but provided authentication config");
+ } else {
+ ERROR("incorrect value in the 'insecure' field");
+ }
+ lua_pop(L, 1);
+
+ /* Init CAs from system trust store, if needed. */
+ if (!newcfg->insecure && !newcfg->pins.len && !has_ca_file) {
+ int ret = gnutls_certificate_set_x509_system_trust(newcfg->credentials);
+ if (ret <= 0) {
+ ERROR("failed to use system CA certificate store: %s",
+ ret ? gnutls_strerror(ret) : kr_strerror(ENOENT));
+ } else {
+ kr_log_verbose(
+ "[tls_client] imported %d certs from system store\n",
+ ret);
+ }
+ }
+ #undef ERROR
+
+ /**** Phase 2: deal with the C authentication "table". */
+ /* Parse address and port. */
+ lua_pushinteger(L, 1);
+ lua_gettable(L, 1);
+ const char *addr_str = lua_tostring(L, -1);
+ if (!addr_str)
+ lua_error_p(L, "address is not a string");
+ char buf[INET6_ADDRSTRLEN + 1];
+ uint16_t port = 853;
+ const struct sockaddr *addr = NULL;
+ if (kr_straddr_split(addr_str, buf, &port) == kr_ok())
+ addr = kr_straddr_socket(buf, port, NULL);
+ /* Add newcfg into the C map, saving the original into oldcfg. */
+ if (!addr)
+ lua_error_p(L, "address '%s' could not be converted", addr_str);
+ tls_client_param_t **oldcfgp = tls_client_param_getptr(
+ &net->tls_client_params, addr, true);
+ free_const(addr);
+ if (!oldcfgp)
+ lua_error_p(L, "internal error when extending tls_client_params map");
+ tls_client_param_t *oldcfg = *oldcfgp;
+ *oldcfgp = newcfg; /* replace old config in trie with the new one */
+ /* If there was no original entry, it's easy! */
+ if (!oldcfg)
+ return 0;
+
+ /* Check for equality (newcfg vs. oldcfg), and print a warning if not equal.*/
+ const bool ok_h = (!newcfg->hostname && !oldcfg->hostname)
+ || (newcfg->hostname && oldcfg->hostname && strcmp(newcfg->hostname, oldcfg->hostname) == 0);
+ bool ok_ca = newcfg->ca_files.len == oldcfg->ca_files.len;
+ for (int i = 0; ok_ca && i < newcfg->ca_files.len; ++i)
+ ok_ca = strcmp(newcfg->ca_files.at[i], oldcfg->ca_files.at[i]) == 0;
+ bool ok_pins = newcfg->pins.len == oldcfg->pins.len;
+ for (int i = 0; ok_pins && i < newcfg->pins.len; ++i)
+ ok_ca = memcmp(newcfg->pins.at[i], oldcfg->pins.at[i], TLS_SHA256_RAW_LEN) == 0;
+ const bool ok_insecure = newcfg->insecure == oldcfg->insecure;
+ if (!(ok_h && ok_ca && ok_pins && ok_insecure)) {
+ kr_log_info("[tls_client] "
+ "warning: re-defining TLS authentication parameters for %s\n",
+ addr_str);
+ }
+ tls_client_param_unref(oldcfg);
+ return 0;
+}
+
+int net_tls_client_clear(lua_State *L)
+{
+ /* One parameter: address -> convert it to a struct sockaddr. */
+ if (lua_gettop(L) != 1 || !lua_isstring(L, 1))
+ lua_error_p(L, "net.tls_client_clear() requires one parameter (\"address\")");
+ const char *addr_str = lua_tostring(L, 1);
+ char buf[INET6_ADDRSTRLEN + 1];
+ uint16_t port = 853;
+ const struct sockaddr *addr = NULL;
+ if (kr_straddr_split(addr_str, buf, &port) == kr_ok())
+ addr = kr_straddr_socket(buf, port, NULL);
+ if (!addr)
+ lua_error_p(L, "invalid IP address");
+ /* Do the actual removal. */
+ struct network *net = &the_worker->engine->net;
+ int r = tls_client_param_remove(net->tls_client_params, addr);
+ free_const(addr);
+ lua_error_maybe(L, r);
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+static int net_tls_padding(lua_State *L)
+{
+ struct kr_context *ctx = &the_worker->engine->resolver;
+
+ /* Only return current padding. */
+ if (lua_gettop(L) == 0) {
+ if (ctx->tls_padding < 0) {
+ lua_pushboolean(L, true);
+ return 1;
+ } else if (ctx->tls_padding == 0) {
+ lua_pushboolean(L, false);
+ return 1;
+ }
+ lua_pushinteger(L, ctx->tls_padding);
+ return 1;
+ }
+
+ const char *errstr = "net.tls_padding parameter has to be true, false,"
+ " or a number between <0, " STR(MAX_TLS_PADDING) ">";
+ if (lua_gettop(L) != 1)
+ lua_error_p(L, "%s", errstr);
+ if (lua_isboolean(L, 1)) {
+ bool x = lua_toboolean(L, 1);
+ if (x) {
+ ctx->tls_padding = -1;
+ } else {
+ ctx->tls_padding = 0;
+ }
+ } else if (lua_isnumber(L, 1)) {
+ int padding = lua_tointeger(L, 1);
+ if ((padding < 0) || (padding > MAX_TLS_PADDING))
+ lua_error_p(L, "%s", errstr);
+ ctx->tls_padding = padding;
+ } else {
+ lua_error_p(L, "%s", errstr);
+ }
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+/** Shorter salt can't contain much entropy. */
+#define net_tls_sticket_MIN_SECRET_LEN 32
+
+static int net_tls_sticket_secret_string(lua_State *L)
+{
+ struct network *net = &the_worker->engine->net;
+
+ size_t secret_len;
+ const char *secret;
+
+ if (lua_gettop(L) == 0) {
+ /* Zero-length secret, implying random key. */
+ secret_len = 0;
+ secret = NULL;
+ } else {
+ if (lua_gettop(L) != 1 || !lua_isstring(L, 1)) {
+ lua_error_p(L,
+ "net.tls_sticket_secret takes one parameter: (\"secret string\")");
+ }
+ secret = lua_tolstring(L, 1, &secret_len);
+ if (secret_len < net_tls_sticket_MIN_SECRET_LEN || !secret) {
+ lua_error_p(L, "net.tls_sticket_secret - the secret is shorter than "
+ STR(net_tls_sticket_MIN_SECRET_LEN) " bytes");
+ }
+ }
+
+ tls_session_ticket_ctx_destroy(net->tls_session_ticket_ctx);
+ net->tls_session_ticket_ctx =
+ tls_session_ticket_ctx_create(net->loop, secret, secret_len);
+ if (net->tls_session_ticket_ctx == NULL) {
+ lua_error_p(L,
+ "net.tls_sticket_secret_string - can't create session ticket context");
+ }
+
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+static int net_tls_sticket_secret_file(lua_State *L)
+{
+ if (lua_gettop(L) != 1 || !lua_isstring(L, 1)) {
+ lua_error_p(L,
+ "net.tls_sticket_secret_file takes one parameter: (\"file name\")");
+ }
+
+ const char *file_name = lua_tostring(L, 1);
+ if (strlen(file_name) == 0)
+ lua_error_p(L, "net.tls_sticket_secret_file - empty file name");
+
+ FILE *fp = fopen(file_name, "r");
+ if (fp == NULL) {
+ lua_error_p(L, "net.tls_sticket_secret_file - can't open file '%s': %s",
+ file_name, strerror(errno));
+ }
+
+ char secret_buf[TLS_SESSION_TICKET_SECRET_MAX_LEN];
+ const size_t secret_len = fread(secret_buf, 1, sizeof(secret_buf), fp);
+ int err = ferror(fp);
+ if (err) {
+ lua_error_p(L,
+ "net.tls_sticket_secret_file - error reading from file '%s': %s",
+ file_name, strerror(err));
+ }
+ if (secret_len < net_tls_sticket_MIN_SECRET_LEN) {
+ lua_error_p(L,
+ "net.tls_sticket_secret_file - file '%s' is shorter than "
+ STR(net_tls_sticket_MIN_SECRET_LEN) " bytes",
+ file_name);
+ }
+ fclose(fp);
+
+ struct network *net = &the_worker->engine->net;
+
+ tls_session_ticket_ctx_destroy(net->tls_session_ticket_ctx);
+ net->tls_session_ticket_ctx =
+ tls_session_ticket_ctx_create(net->loop, secret_buf, secret_len);
+ if (net->tls_session_ticket_ctx == NULL) {
+ lua_error_p(L,
+ "net.tls_sticket_secret_file - can't create session ticket context");
+ }
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+static int net_outgoing(lua_State *L, int family)
+{
+ union inaddr *addr;
+ if (family == AF_INET)
+ addr = (union inaddr*)&the_worker->out_addr4;
+ else
+ addr = (union inaddr*)&the_worker->out_addr6;
+
+ if (lua_gettop(L) == 0) { /* Return the current value. */
+ if (addr->ip.sa_family == AF_UNSPEC) {
+ lua_pushnil(L);
+ return 1;
+ }
+ if (addr->ip.sa_family != family) {
+ assert(false);
+ lua_error_p(L, "bad address family");
+ }
+ char addr_buf[INET6_ADDRSTRLEN];
+ int err;
+ if (family == AF_INET)
+ err = uv_ip4_name(&addr->ip4, addr_buf, sizeof(addr_buf));
+ else
+ err = uv_ip6_name(&addr->ip6, addr_buf, sizeof(addr_buf));
+ lua_error_maybe(L, err);
+ lua_pushstring(L, addr_buf);
+ return 1;
+ }
+
+ if ((lua_gettop(L) != 1) || (!lua_isstring(L, 1) && !lua_isnil(L, 1)))
+ lua_error_p(L, "net.outgoing_vX takes one address string parameter or nil");
+
+ if (lua_isnil(L, 1)) {
+ addr->ip.sa_family = AF_UNSPEC;
+ return 1;
+ }
+
+ const char *addr_str = lua_tostring(L, 1);
+ int err;
+ if (family == AF_INET)
+ err = uv_ip4_addr(addr_str, 0, &addr->ip4);
+ else
+ err = uv_ip6_addr(addr_str, 0, &addr->ip6);
+ if (err)
+ lua_error_p(L, "net.outgoing_vX: failed to parse the address");
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+static int net_outgoing_v4(lua_State *L) { return net_outgoing(L, AF_INET); }
+static int net_outgoing_v6(lua_State *L) { return net_outgoing(L, AF_INET6); }
+
+static int net_update_timeout(lua_State *L, uint64_t *timeout, const char *name)
+{
+ /* Only return current idle timeout. */
+ if (lua_gettop(L) == 0) {
+ lua_pushinteger(L, *timeout);
+ return 1;
+ }
+
+ if ((lua_gettop(L) != 1))
+ lua_error_p(L, "%s takes one parameter: (\"idle timeout\")", name);
+
+ if (lua_isnumber(L, 1)) {
+ int idle_timeout = lua_tointeger(L, 1);
+ if (idle_timeout <= 0)
+ lua_error_p(L, "%s parameter has to be positive number", name);
+ *timeout = idle_timeout;
+ } else {
+ lua_error_p(L, "%s parameter has to be positive number", name);
+ }
+ lua_pushboolean(L, true);
+ return 1;
+}
+
+static int net_tcp_in_idle(lua_State *L)
+{
+ struct network *net = &the_worker->engine->net;
+ return net_update_timeout(L, &net->tcp.in_idle_timeout, "net.tcp_in_idle");
+}
+
+static int net_tls_handshake_timeout(lua_State *L)
+{
+ struct network *net = &the_worker->engine->net;
+ return net_update_timeout(L, &net->tcp.tls_handshake_timeout, "net.tls_handshake_timeout");
+}
+
+static int net_bpf_set(lua_State *L)
+{
+ if (lua_gettop(L) != 1 || !lua_isnumber(L, 1)) {
+ lua_error_p(L, "net.bpf_set(fd) takes one parameter:"
+ " the open file descriptor of a loaded BPF program");
+ }
+
+#if __linux__
+
+ int progfd = lua_tointeger(L, 1);
+ if (progfd == 0) {
+ /* conversion error despite that fact
+ * that lua_isnumber(L, 1) has returned true.
+ * Real or stdin? */
+ lua_error_p(L, "failed to convert parameter");
+ }
+ lua_pop(L, 1);
+
+ if (network_set_bpf(&the_worker->engine->net, progfd) == 0) {
+ lua_error_p(L, "failed to attach BPF program to some networks: %s",
+ kr_strerror(errno));
+ }
+
+ lua_pushboolean(L, 1);
+ return 1;
+
+#endif
+ lua_error_p(L, "BPF is not supported on this operating system");
+}
+
+static int net_bpf_clear(lua_State *L)
+{
+ if (lua_gettop(L) != 0)
+ lua_error_p(L, "net.bpf_clear() does not take any parameters");
+
+#if __linux__
+
+ network_clear_bpf(&the_worker->engine->net);
+
+ lua_pushboolean(L, 1);
+ return 1;
+
+#endif
+ lua_error_p(L, "BPF is not supported on this operating system");
+}
+
+static int net_register_endpoint_kind(lua_State *L)
+{
+ const int param_count = lua_gettop(L);
+ if (param_count != 1 && param_count != 2)
+ lua_error_p(L, "expected one or two parameters");
+ if (!lua_isstring(L, 1)) {
+ lua_error_p(L, "incorrect kind '%s'", lua_tostring(L, 1));
+ }
+ size_t kind_len;
+ const char *kind = lua_tolstring(L, 1, &kind_len);
+ struct network *net = &the_worker->engine->net;
+
+ /* Unregistering */
+ if (param_count == 1) {
+ void *val;
+ if (trie_del(net->endpoint_kinds, kind, kind_len, &val) == KNOT_EOK) {
+ const int fun_id = (char *)val - (char *)NULL;
+ luaL_unref(L, LUA_REGISTRYINDEX, fun_id);
+ return 0;
+ }
+ lua_error_p(L, "attempt to unregister unknown kind '%s'\n", kind);
+ } /* else */
+
+ /* Registering */
+ assert(param_count == 2);
+ if (!lua_isfunction(L, 2)) {
+ lua_error_p(L, "second parameter: expected function but got %s\n",
+ lua_typename(L, lua_type(L, 2)));
+ }
+ const int fun_id = luaL_ref(L, LUA_REGISTRYINDEX);
+ /* ^^ The function is on top of the stack, incidentally. */
+ void **pp = trie_get_ins(net->endpoint_kinds, kind, kind_len);
+ if (!pp) lua_error_maybe(L, kr_error(ENOMEM));
+ if (*pp != NULL || !strcasecmp(kind, "dns") || !strcasecmp(kind, "tls"))
+ lua_error_p(L, "attempt to register known kind '%s'\n", kind);
+ *pp = (char *)NULL + fun_id;
+ /* We don't attempt to engage correspoinding endpoints now.
+ * That's the job for network_engage_endpoints() later. */
+ return 0;
+}
+
+int kr_bindings_net(lua_State *L)
+{
+ static const luaL_Reg lib[] = {
+ { "list", net_list },
+ { "listen", net_listen },
+ { "close", net_close },
+ { "interfaces", net_interfaces },
+ { "bufsize", net_bufsize },
+ { "tcp_pipeline", net_pipeline },
+ { "tls", net_tls },
+ { "tls_server", net_tls },
+ { "tls_client", net_tls_client },
+ { "tls_client_clear", net_tls_client_clear },
+ { "tls_padding", net_tls_padding },
+ { "tls_sticket_secret", net_tls_sticket_secret_string },
+ { "tls_sticket_secret_file", net_tls_sticket_secret_file },
+ { "outgoing_v4", net_outgoing_v4 },
+ { "outgoing_v6", net_outgoing_v6 },
+ { "tcp_in_idle", net_tcp_in_idle },
+ { "tls_handshake_timeout", net_tls_handshake_timeout },
+ { "bpf_set", net_bpf_set },
+ { "bpf_clear", net_bpf_clear },
+ { "register_endpoint_kind", net_register_endpoint_kind },
+ { NULL, NULL }
+ };
+ luaL_register(L, "net", lib);
+ return 1;
+}
+
diff --git a/daemon/bindings/net_client.rst b/daemon/bindings/net_client.rst
new file mode 100644
index 0000000..34e6236
--- /dev/null
+++ b/daemon/bindings/net_client.rst
@@ -0,0 +1,34 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+IPv4 and IPv6 usage
+-------------------
+
+Following settings affect client part of the resolver,
+i.e. communication between the resolver itself and other DNS servers.
+
+IPv4 and IPv6 protocols are used by default. For performance reasons it is
+recommended to explicitly disable protocols which are not available
+on your system, though the impact of IPv6 outage is lowered since release 5.3.0.
+
+.. envvar:: net.ipv4 = true|false
+
+ :return: boolean (default: true)
+
+ Enable/disable using IPv4 for contacting upstream nameservers.
+
+.. envvar:: net.ipv6 = true|false
+
+ :return: boolean (default: true)
+
+ Enable/disable using IPv6 for contacting upstream nameservers.
+
+.. function:: net.outgoing_v4([string address])
+
+ Get/set the IPv4 address used to perform queries.
+ The default is ``nil``, which lets the OS choose any address.
+
+.. function:: net.outgoing_v6([string address])
+
+ Get/set the IPv6 address used to perform queries.
+ The default is ``nil``, which lets the OS choose any address.
+
diff --git a/daemon/bindings/net_dns_tweaks.rst b/daemon/bindings/net_dns_tweaks.rst
new file mode 100644
index 0000000..203a504
--- /dev/null
+++ b/daemon/bindings/net_dns_tweaks.rst
@@ -0,0 +1,35 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+DNS protocol tweaks
+-------------------
+
+Following settings change low-level details of DNS protocol implementation.
+Default values should not be changed except for very special cases.
+
+.. function:: net.bufsize([udp_downstream_bufsize][, udp_upstream_bufsize])
+
+ Get/set maximum EDNS payload size advertised in DNS packets. Different values can be configured for communication downstream (towards clients) and upstream (towards other DNS servers). Set and also get operations use values in this order.
+
+ Default is 1232 bytes which was chosed to minimize risk of `issues caused by IP fragmentation <https://blog.apnic.net/2019/07/12/its-time-to-consider-avoiding-ip-fragmentation-in-the-dns/>`_. Further details can be found at `DNS Flag Day 2020 <https://dnsflagday.net/2020/>`_ web site.
+
+ Minimal value allowed by standard :rfc:`6891` is 512 bytes, which is equal to DNS packet size without Extension Mechanisms for DNS. Value 1220 bytes is minimum size required by DNSSEC standard :rfc:`4035`.
+
+ Example output:
+
+ .. code-block:: lua
+
+ -- set downstream and upstream bufsize to value 4096
+ > net.bufsize(4096)
+ -- get configured downstream and upstream bufsizes, respectively
+ > net.bufsize()
+ 4096 -- result # 1
+ 4096 -- result # 2
+
+ -- set downstream bufsize to 4096 and upstream bufsize to 1232
+ > net.bufsize(4096, 1232)
+ -- get configured downstream and upstream bufsizes, respectively
+ > net.bufsize()
+ 4096 -- result # 1
+ 1232 -- result # 2
+
+.. include:: ../modules/workarounds/README.rst
diff --git a/daemon/bindings/net_server.rst b/daemon/bindings/net_server.rst
new file mode 100644
index 0000000..53e0efe
--- /dev/null
+++ b/daemon/bindings/net_server.rst
@@ -0,0 +1,166 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+Addresses and services
+----------------------
+
+Addresses, ports, protocols, and API calls available for clients communicating
+with resolver are configured using :func:`net.listen`.
+
+First you need to decide what service should be available on given IP address
++ port combination.
+
+.. csv-table::
+ :header: "Protocol/service", "net.listen *kind*"
+
+ "DNS (unencrypted UDP+TCP, :rfc:`1034`)","``dns``"
+ "DNS (unencrypted UDP, :ref:`using XDP Linux API <dns-over-xdp>`)","``xdp``"
+ ":ref:`dns-over-tls`","``tls``"
+ ":ref:`dns-over-https`","``doh2``"
+ ":ref:`Web management <mod-http-built-in-services>`","``webmgmt``"
+ ":ref:`Control socket <control-sockets>`","``control``"
+ ":ref:`mod-http-doh`","``doh``"
+
+.. note:: By default, **unencrypted DNS and DNS-over-TLS** are configured to **listen
+ on localhost**.
+
+ Control sockets are created either in
+ ``/run/knot-resolver/control/`` (when using systemd) or ``$PWD/control/``.
+
+.. function:: net.listen(addresses, [port = 53, { kind = 'dns', freebind = false }])
+
+ :return: ``true`` if port is bound, an error otherwise
+
+ Listen on addresses; port and flags are optional.
+ The addresses can be specified as a string or device.
+ Port 853 implies ``kind = 'tls'`` but it is always better to be explicit.
+ Freebind allows binding to a non-local or not yet available address.
+
+.. csv-table::
+ :header: "**Network protocol**", "**Configuration command**"
+
+ "DNS (UDP+TCP, :rfc:`1034`)","``net.listen('192.0.2.123', 53)``"
+ "DNS (UDP, :ref:`using XDP <dns-over-xdp>`)","``net.listen('192.0.2.123', 53, { kind = 'xdp' })``"
+ ":ref:`dns-over-tls`","``net.listen('192.0.2.123', 853, { kind = 'tls' })``"
+ ":ref:`dns-over-https`","``net.listen('192.0.2.123', 443, { kind = 'doh2' })``"
+ ":ref:`Web management <mod-http-built-in-services>`","``net.listen('192.0.2.123', 8453, { kind = 'webmgmt' })``"
+ ":ref:`Control socket <control-sockets>`","``net.listen('/tmp/kres.control', nil, { kind = 'control' })``"
+
+
+Examples:
+
+ .. code-block:: lua
+
+ net.listen('::1')
+ net.listen(net.lo, 53)
+ net.listen(net.eth0, 853, { kind = 'tls' })
+ net.listen('192.0.2.1', 53, { freebind = true })
+ net.listen({'127.0.0.1', '::1'}, 53, { kind = 'dns' })
+ net.listen('::', 443, { kind = 'doh2' })
+ net.listen('::', 8453, { kind = 'webmgmt' }) -- see http module
+ net.listen('/tmp/kresd-socket', nil, { kind = 'webmgmt' }) -- http module supports AF_UNIX
+ net.listen('eth0', 53, { kind = 'xdp' })
+ net.listen('192.0.2.123', 53, { kind = 'xdp', nic_queue = 0 })
+
+.. warning:: On machines with multiple IP addresses avoid listening on wildcards
+ ``0.0.0.0`` or ``::``. Knot Resolver could answer from different IP
+ addresses if the network address ranges overlap,
+ and clients would probably refuse such a response.
+
+
+Features for scripting
+^^^^^^^^^^^^^^^^^^^^^^
+Following configuration functions are useful mainly for scripting or :ref:`runtime-cfg`.
+
+.. function:: net.close(address, [port])
+
+ :return: boolean (at least one endpoint closed)
+
+ Close all endpoints listening on the specified address, optionally restricted by port as well.
+
+
+.. function:: net.list()
+
+ :return: Table of bound interfaces.
+
+ Example output:
+
+ .. code-block:: none
+
+ [1] => {
+ [kind] => tls
+ [transport] => {
+ [family] => inet4
+ [ip] => 127.0.0.1
+ [port] => 853
+ [protocol] => tcp
+ }
+ }
+ [2] => {
+ [kind] => dns
+ [transport] => {
+ [family] => inet6
+ [ip] => ::1
+ [port] => 53
+ [protocol] => udp
+ }
+ }
+ [3] => {
+ [kind] => dns
+ [transport] => {
+ [family] => inet6
+ [ip] => ::1
+ [port] => 53
+ [protocol] => tcp
+ }
+ }
+ [4] => {
+ [kind] => xdp
+ [transport] => {
+ [family] => inet4+inet6
+ [interface] => eth2
+ [nic_queue] => 0
+ [port] => 53
+ [protocol] => udp
+ }
+ }
+
+.. function:: net.interfaces()
+
+ :return: Table of available interfaces and their addresses.
+
+ Example output:
+
+ .. code-block:: none
+
+ [lo0] => {
+ [addr] => {
+ [1] => ::1
+ [2] => 127.0.0.1
+ }
+ [mac] => 00:00:00:00:00:00
+ }
+ [eth0] => {
+ [addr] => {
+ [1] => 192.168.0.1
+ }
+ [mac] => de:ad:be:ef:aa:bb
+ }
+
+ .. tip:: You can use ``net.<iface>`` as a shortcut for specific interface, e.g. ``net.eth0``
+
+.. function:: net.tcp_pipeline([len])
+
+ Get/set per-client TCP pipeline limit, i.e. the number of outstanding queries that a single client connection can make in parallel. Default is 100.
+
+ .. code-block:: lua
+
+ > net.tcp_pipeline()
+ 100
+ > net.tcp_pipeline(50)
+ 50
+
+ .. warning:: Please note that too large limit may have negative impact on performance and can lead to increased number of SERVFAIL answers.
+
+.. _`dnsproxy module`: https://www.knot-dns.cz/docs/2.7/html/modules.html#dnsproxy-tiny-dns-proxy
+
+
diff --git a/daemon/bindings/net_tlssrv.rst b/daemon/bindings/net_tlssrv.rst
new file mode 100644
index 0000000..0d0431e
--- /dev/null
+++ b/daemon/bindings/net_tlssrv.rst
@@ -0,0 +1,139 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _tls-server-config:
+
+DoT and DoH (encrypted DNS)
+---------------------------
+
+.. warning::
+
+ It is important to understand **limits of encrypting only DNS traffic**.
+ Relevant security analysis can be found in article
+ *Simran Patil and Nikita Borisov. 2019. What can you learn from an IP?*
+ See `slides <https://irtf.org/anrw/2019/slides-anrw19-final44.pdf>`_
+ or `the article itself <https://dl.acm.org/authorize?N687437>`_.
+
+DoT and DoH encrypt DNS traffic with Transport Layer Security (TLS) protocol
+and thus protects DNS traffic from certain types of attacks.
+
+You can learn more about DoT and DoH and their implementation in Knot Resolver
+in `this article
+<https://en.blog.nic.cz/2020/11/25/encrypted-dns-in-knot-resolver-dot-and-doh/>`_.
+
+.. _dns-over-tls:
+
+DNS-over-TLS (DoT)
+^^^^^^^^^^^^^^^^^^
+
+DNS-over-TLS server (:rfc:`7858`) can be configured using ``tls`` kind in
+:func:`net.listen()`. It is enabled on localhost by default.
+
+For certificate configuration, refer to :ref:`dot-doh-config-options`.
+
+.. _dns-over-https:
+
+DNS-over-HTTPS (DoH)
+^^^^^^^^^^^^^^^^^^^^
+
+.. note:: Knot Resolver currently offers two DoH implementations. It is
+ recommended to use this new implementation, which is more reliable, scalable
+ and has fewer dependencies. Make sure to use ``doh2`` kind in
+ :func:`net.listen()` to select this implementation.
+
+.. tip:: Independent information about political controversies around the
+ DoH deployment by default can be found in blog posts `DNS Privacy at IETF
+ 104 <http://www.potaroo.net/ispcol/2019-04/angst.html>`_ and `More DOH
+ <http://www.potaroo.net/ispcol/2019-04/moredoh.html>`_ by Geoff Huston and
+ `Centralised DoH is bad for Privacy, in 2019 and beyond
+ <https://labs.ripe.net/Members/bert_hubert/centralised-doh-is-bad-for-privacy-in-2019-and-beyond>`_
+ by Bert Hubert.
+
+DNS-over-HTTPS server (:rfc:`8484`) can be configured using ``doh2`` kind in
+:func:`net.listen()`.
+
+This implementation supports HTTP/2 (:rfc:`7540`). Queries can be sent to the
+``/dns-query`` endpoint, e.g.:
+
+.. code-block:: bash
+
+ $ kdig @127.0.0.1 +https www.knot-resolver.cz AAAA
+
+**Only TLS version 1.3 (or higher) is supported with DNS-over-HTTPS.** The
+additional considerations for TLS 1.2 required by HTTP/2 are not implemented
+(:rfc:`7540#section-9.2`).
+
+.. warning:: Take care when configuring your server to listen on well known
+ HTTPS port. If an unrelated HTTPS service is running on the same port with
+ REUSEPORT enabled, you will end up with both services malfunctioning.
+
+.. _dot-doh-config-options:
+
+Configuration options
+^^^^^^^^^^^^^^^^^^^^^
+
+.. note:: These settings affect both DNS-over-TLS and DNS-over-HTTPS (except
+ the legacy implementation).
+
+A self-signed certificate is generated by default. For serious deployments
+it is strongly recommended to configure your own TLS certificates signed
+by a trusted CA. This is done using function :c:func:`net.tls()`.
+
+.. function:: net.tls([cert_path], [key_path])
+
+ When called with path arguments, the function loads the server TLS
+ certificate and private key for DoT and DoH.
+
+ When called without arguments, the command returns the currently configured paths.
+
+ Example output:
+
+ .. code-block:: lua
+
+ > net.tls("/etc/knot-resolver/server-cert.pem", "/etc/knot-resolver/server-key.pem")
+ > net.tls() -- print configured paths
+ ("/etc/knot-resolver/server-cert.pem", "/etc/knot-resolver/server-key.pem")
+
+ .. tip:: The certificate files aren't automatically reloaded on change. If
+ you update the certificate files, e.g. using ACME, you have to either
+ restart the service(s) or call this function again using
+ :ref:`control-sockets`.
+
+.. function:: net.tls_sticket_secret([string with pre-shared secret])
+
+ Set secret for TLS session resumption via tickets, by :rfc:`5077`.
+
+ The server-side key is rotated roughly once per hour.
+ By default or if called without secret, the key is random.
+ That is good for long-term forward secrecy, but multiple kresd instances
+ won't be able to resume each other's sessions.
+
+ If you provide the same secret to multiple instances, they will be able to resume
+ each other's sessions *without* any further communication between them.
+ This synchronization works only among instances having the same endianess
+ and time_t structure and size (`sizeof(time_t)`).
+
+ **For good security** the secret must have enough entropy to be hard to guess,
+ and it should still be occasionally rotated manually and securely forgotten,
+ to reduce the scope of privacy leak in case the
+ `secret leaks eventually <https://en.wikipedia.org/wiki/Forward_secrecy>`_.
+
+ .. warning:: **Setting the secret is probably too risky with TLS <= 1.2**.
+ GnuTLS stable release supports TLS 1.3 since 3.6.3 (summer 2018).
+ Therefore setting the secrets should be considered experimental for now
+ and might not be available on your system.
+
+.. function:: net.tls_sticket_secret_file([string with path to a file containing pre-shared secret])
+
+ The same as :func:`net.tls_sticket_secret`,
+ except the secret is read from a (binary) file.
+
+.. function:: net.tls_padding([true | false])
+
+ Get/set EDNS(0) padding of answers to queries that arrive over TLS
+ transport. If set to `true` (the default), it will use a sensible
+ default padding scheme, as implemented by libknot if available at
+ compile time. If set to a numeric value >= 2 it will pad the
+ answers to nearest *padding* boundary, e.g. if set to `64`, the
+ answer will have size of a multiple of 64 (64, 128, 192, ...). If
+ set to `false` (or a number < 2), it will disable padding entirely.
+
diff --git a/daemon/bindings/net_xdpsrv.rst b/daemon/bindings/net_xdpsrv.rst
new file mode 100644
index 0000000..1abc9d3
--- /dev/null
+++ b/daemon/bindings/net_xdpsrv.rst
@@ -0,0 +1,138 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _dns-over-xdp:
+
+XDP for higher UDP performance
+------------------------------
+
+.. warning::
+ As of version 5.2.0, XDP support in Knot Resolver is considered
+ experimental. The impact on overall throughput and performance may not
+ always be beneficial.
+
+Using XDP allows significant speedup of UDP packet processing in recent Linux kernels,
+especially with some network drivers that implement good support.
+The basic idea is that for selected packets the Linux networking stack is bypassed,
+and some drivers can even directly use the user-space buffers for reading and writing.
+
+.. TODO perhaps some hint/link about how significant speedup one might get? (link to some talk video?)
+
+Prerequisites
+^^^^^^^^^^^^^
+.. this is mostly copied from knot-dns doc/operations.rst
+
+.. warning::
+ Bypassing the network stack has significant implications, such as bypassing the firewall
+ and monitoring solutions.
+ Make sure you're familiar with the trade-offs before using this feature.
+ Read more in :ref:`dns-over-xdp_limitations`.
+
+* Linux kernel 4.18+ (5.x+ is recommended for optimal performance) compiled with
+ the `CONFIG_XDP_SOCKETS=y` option. XDP isn't supported in other operating systems.
+* libknot compiled with XDP support
+* **A multiqueue network card with native XDP support is highly recommended**,
+ otherwise the performance gain will be much lower and you may encounter
+ issues due to XDP emulation.
+ Successfully tested cards:
+
+ * Intel series 700 (driver `i40e`), maximum number of queues per interface is 64.
+ * Intel series 500 (driver `ixgbe`), maximum number of queues per interface is 64.
+ The number of CPUs available has to be at most 64!
+
+
+Set up
+^^^^^^
+.. first parts are mostly copied from knot-dns doc/operations.rst
+
+The server instances need additional Linux **capabilities** during startup.
+(Or you could start them as `root`.)
+Execute command
+
+.. code-block:: bash
+
+ systemctl edit kresd@.service
+
+And insert these lines:
+
+.. code-block:: ini
+
+ [Service]
+ CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN CAP_SYS_ADMIN CAP_SYS_RESOURCE
+ AmbientCapabilities=CAP_NET_RAW CAP_NET_ADMIN CAP_SYS_ADMIN CAP_SYS_RESOURCE
+
+.. TODO suggest some way for ethtool -L? Perhaps via systemd units?
+
+You want the same number of kresd instances and network **queues** on your card;
+you can use ``ethtool -L`` before the services start.
+With XDP this is more important than with vanilla UDP, as we only support one instance
+per queue and unclaimed queues will fall back to vanilla UDP.
+Ideally you can set these numbers as high as the number of CPUs that you want kresd to use.
+
+Modification of ``/etc/knot-resolver/kresd.conf`` may often be quite simple, for example:
+
+.. code-block:: lua
+
+ net.listen('eth2', 53, { kind = 'xdp' })
+ net.listen('203.0.113.53', 53, { kind = 'dns' })
+
+Note that you want to also keep the vanilla DNS line to service TCP
+and possibly any fallback UDP (e.g. from unclaimed queues).
+XDP listening is in principle done on queues of whole network interfaces
+and the target addresses of incoming packets aren't checked in any way,
+but you are still allowed to specify interface by an address
+(if it's unambiguous at that moment):
+
+.. code-block:: lua
+
+ net.listen('203.0.113.53', 53, { kind = 'xdp' })
+ net.listen('203.0.113.53', 53, { kind = 'dns' })
+
+The default selection of queues is tailored for the usual naming convention:
+``kresd@1.service``, ``kresd@2.service``, ...
+but you can still specify them explicitly, e.g. the default is effectively the same as:
+
+.. code-block:: lua
+
+ net.listen('eth2', 53, { kind = 'xdp', nic_queue = env.SYSTEMD_INSTANCE - 1 })
+
+
+Optimizations
+^^^^^^^^^^^^^
+.. this is basically copied from knot-dns doc/operations.rst
+
+Some helpful commands:
+
+.. code-block:: text
+
+ ethtool -N <interface> rx-flow-hash udp4 sdfn
+ ethtool -N <interface> rx-flow-hash udp6 sdfn
+ ethtool -L <interface> combined <queue-number>
+ ethtool -G <interface> rx <ring-size> tx <ring-size>
+ renice -n 19 -p $(pgrep '^ksoftirqd/[0-9]*$')
+
+.. TODO CPU affinities? `CPUAffinity=%i` in systemd unit sounds good.
+
+
+.. _dns-over-xdp_limitations:
+
+Limitations
+^^^^^^^^^^^
+.. this is basically copied from knot-dns doc/operations.rst
+
+* VLAN segmentation is not supported.
+* MTU higher than 1792 bytes is not supported.
+* Multiple BPF filters per one network device are not supported.
+* Symmetrical routing is required (query source MAC/IP addresses and
+ reply destination MAC/IP addresses are the same).
+* Systems with big-endian byte ordering require special recompilation of libknot.
+* IPv4 header and UDP checksums are not verified on received DNS messages.
+* DNS over XDP traffic is not visible to common system tools (e.g. firewall, tcpdump etc.).
+* BPF filter is not automatically unloaded from the network device. Manual filter unload::
+
+ ip link set dev <interface> xdp off
+
+* Knot Resolver only supports using XDP towards clients currently (not towards upstreams).
+* When starting up an XDP socket you may get a harmless warning::
+
+ libbpf: Kernel error message: XDP program already attached
+
diff --git a/daemon/bindings/worker.c b/daemon/bindings/worker.c
new file mode 100644
index 0000000..f0a533f
--- /dev/null
+++ b/daemon/bindings/worker.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 2015-2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/bindings/impl.h"
+
+
+static inline double getseconds(uv_timeval_t *tv)
+{
+ return (double)tv->tv_sec + 0.000001*((double)tv->tv_usec);
+}
+
+/** Return worker statistics. */
+static int wrk_stats(lua_State *L)
+{
+ struct worker_ctx *worker = the_worker;
+ if (!worker) {
+ return 0;
+ }
+ lua_newtable(L);
+ lua_pushnumber(L, worker->stats.queries);
+ lua_setfield(L, -2, "queries");
+ lua_pushnumber(L, worker->stats.concurrent);
+ lua_setfield(L, -2, "concurrent");
+ lua_pushnumber(L, worker->stats.dropped);
+ lua_setfield(L, -2, "dropped");
+
+ lua_pushnumber(L, worker->stats.timeout);
+ lua_setfield(L, -2, "timeout");
+ lua_pushnumber(L, worker->stats.udp);
+ lua_setfield(L, -2, "udp");
+ lua_pushnumber(L, worker->stats.tcp);
+ lua_setfield(L, -2, "tcp");
+ lua_pushnumber(L, worker->stats.tls);
+ lua_setfield(L, -2, "tls");
+ lua_pushnumber(L, worker->stats.ipv4);
+ lua_setfield(L, -2, "ipv4");
+ lua_pushnumber(L, worker->stats.ipv6);
+ lua_setfield(L, -2, "ipv6");
+ lua_pushnumber(L, worker->stats.err_udp);
+ lua_setfield(L, -2, "err_udp");
+ lua_pushnumber(L, worker->stats.err_tcp);
+ lua_setfield(L, -2, "err_tcp");
+ lua_pushnumber(L, worker->stats.err_tls);
+ lua_setfield(L, -2, "err_tls");
+ lua_pushnumber(L, worker->stats.err_http);
+ lua_setfield(L, -2, "err_http");
+
+ /* Add subset of rusage that represents counters. */
+ uv_rusage_t rusage;
+ if (uv_getrusage(&rusage) == 0) {
+ lua_pushnumber(L, getseconds(&rusage.ru_utime));
+ lua_setfield(L, -2, "usertime");
+ lua_pushnumber(L, getseconds(&rusage.ru_stime));
+ lua_setfield(L, -2, "systime");
+ lua_pushnumber(L, rusage.ru_majflt);
+ lua_setfield(L, -2, "pagefaults");
+ lua_pushnumber(L, rusage.ru_nswap);
+ lua_setfield(L, -2, "swaps");
+ lua_pushnumber(L, rusage.ru_nvcsw + rusage.ru_nivcsw);
+ lua_setfield(L, -2, "csw");
+ }
+ /* Get RSS */
+ size_t rss = 0;
+ if (uv_resident_set_memory(&rss) == 0) {
+ lua_pushnumber(L, rss);
+ lua_setfield(L, -2, "rss");
+ }
+ return 1;
+}
+
+int kr_bindings_worker(lua_State *L)
+{
+ static const luaL_Reg lib[] = {
+ { "stats", wrk_stats },
+ { NULL, NULL }
+ };
+ luaL_register(L, "worker", lib);
+ return 1;
+}
+
diff --git a/daemon/bindings/worker.rst b/daemon/bindings/worker.rst
new file mode 100644
index 0000000..9dfcbe8
--- /dev/null
+++ b/daemon/bindings/worker.rst
@@ -0,0 +1,35 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+Scripting worker
+^^^^^^^^^^^^^^^^
+
+Worker is a service over event loop that tracks and schedules outstanding queries,
+you can see the statistics or schedule new queries. It also contains information about
+specified worker count and process rank.
+
+.. envvar:: worker.id
+
+ Value from environment variable ``SYSTEMD_INSTANCE``,
+ or if it is not set, :envvar:`PID <worker.pid>` (string).
+
+.. envvar:: worker.pid
+
+ Current worker process PID (number).
+
+.. function:: worker.stats()
+
+ Return table of statistics. See member descriptions in :c:type:`worker_stats`.
+ A few fields are added, mainly from POSIX ``getrusage()``:
+
+ * ``usertime`` and ``systime`` -- CPU time used, in seconds
+ * ``pagefaults`` -- the number of hard page faults, i.e. those that required I/O activity
+ * ``swaps`` -- the number of times the process was “swapped” out of main memory; unused on Linux
+ * ``csw`` -- the number of context switches, both voluntary and involuntary
+ * ``rss`` -- current memory usage in bytes, including whole cache (resident set size)
+
+ Example:
+
+ .. code-block:: lua
+
+ print(worker.stats().concurrent)
+
diff --git a/daemon/cache.test/clear.test.lua b/daemon/cache.test/clear.test.lua
new file mode 100644
index 0000000..8185ae5
--- /dev/null
+++ b/daemon/cache.test/clear.test.lua
@@ -0,0 +1,214 @@
+-- unload modules which are not related to this test
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+if ta_signal_query then
+ modules.unload('ta_signal_query')
+end
+if priming then
+ modules.unload('priming')
+end
+if detect_time_skew then
+ modules.unload('detect_time_skew')
+end
+
+-- test. domain is used by some tests, allow it
+policy.add(policy.suffix(policy.PASS, {todname('test.')}))
+
+cache.size = 2*MB
+-- verbose(true)
+
+-- Self-checks on globals
+assert(help() ~= nil)
+assert(worker.id ~= nil)
+-- Self-checks on facilities
+assert(cache.stats() ~= nil)
+assert(cache.backends() ~= nil)
+assert(worker.stats() ~= nil)
+assert(net.interfaces() ~= nil)
+-- Self-checks on loaded stuff
+assert(#modules.list() > 0)
+-- Self-check timers
+ev = event.recurrent(1 * sec, function () return 1 end)
+event.cancel(ev)
+ev = event.after(0, function () return 1 end)
+
+
+-- Import fake root zone; avoid interference with configured keyfile_default.
+trust_anchors.remove('.')
+trust_anchors.add('. IN DS 48409 8 2 3D63A0C25BCE86621DE63636F11B35B908EFE8E9381E0E3E9DEFD89EA952C27D')
+
+local check_answer = require('test_utils').check_answer
+
+-- do not attempt to contact outside world, operate only on cache
+net.ipv4 = false
+net.ipv6 = false
+-- do not listen, test is driven by config code
+env.KRESD_NO_LISTEN = true
+
+
+local function import_zone()
+ local import_res = cache.zone_import('testroot.zone')
+ assert(import_res.code == 0)
+ -- beware that import takes at least 100 ms
+ worker.sleep(0.2) -- zimport is delayed by 100 ms from function call
+ -- sanity checks - cache must be filled in
+ ok(cache.count() > 0, 'cache is not empty after import')
+ check_answer('root apex is in cache',
+ '.', kres.type.NS, kres.rcode.NOERROR)
+ check_answer('deep subdomain is in cache',
+ 'a.b.subtree1.', kres.type.AAAA, kres.rcode.NOERROR)
+
+end
+
+local function test_exact_match_qtype()
+ nok(cache.clear('a.b.subtree1.', true, kres.type.A)['chunk_limit'],
+ 'single qname+qtype can be cleared at once')
+ check_answer('exact match on qname+qtype must flush RR from cache',
+ 'a.b.subtree1.', kres.type.A, kres.rcode.SERVFAIL)
+ check_answer('exact match on qname+qtype must not affect other RRs on the same node',
+ 'a.b.subtree1.', kres.type.AAAA, kres.rcode.NOERROR)
+ check_answer('exact match on qname must not affect parent',
+ 'b.subtree1.', kres.type.A, kres.rcode.NOERROR)
+end
+
+local function test_exact_match_qname()
+ res = cache.clear('a.b.SubTree1.')
+ is(res.count, 2, 'single qname can be cleared at once')
+ check_answer('exact match on qname must flush all RRs with the same owner from cache',
+ 'a.b.subtree1.', kres.type.AAAA, kres.rcode.SERVFAIL)
+ check_answer('exact match on qname must flush all RRs with the same owner from cache',
+ 'a.b.subtree1.', kres.type.A, kres.rcode.SERVFAIL)
+ check_answer('exact match on qname must flush all RRs with the same owner from cache',
+ 'a.b.subtree1.', kres.type.TXT, kres.rcode.SERVFAIL)
+ -- exact match for negative proofs is not implemented yet
+ --check_answer('exact match on qname must flush negative proofs for owner from cache',
+ -- 'a.b.subtree1.', kres.type.NULL, kres.rcode.SERVFAIL)
+ --check_answer('exact match on qname must not affect parent',
+ -- 'b.subtree1.', kres.type.A, kres.rcode.NOERROR)
+ -- same(cache.clear(), 0, 'full cache clear can be performed')
+ --check_answer('.', kres.type.NS, false)
+
+end
+
+local function test_subtree()
+ res = cache.clear('subtree1.')
+ nok(res.chunk_limit,
+ 'whole positive subtree must be flushed (does not include neg. proofs)')
+ ok(res.not_apex,
+ 'subtree clear below apex must be detected')
+ same(res.subtree, '.', 'detected apex must be returned')
+ check_answer('subtree variant must flush all RRs in subdomains from cache',
+ 'b.subtree1.', kres.type.A, kres.rcode.SERVFAIL)
+ check_answer('subtree variant must flush all RRs in subdomains from cache',
+ 'b.subtree1.', kres.type.TXT, kres.rcode.SERVFAIL)
+ check_answer('subtree variant must flush all RRs in subdomains from cache',
+ 'subtree1.', kres.type.TXT, kres.rcode.SERVFAIL)
+ check_answer('subtree variant must not affect parent',
+ '.', kres.type.NS, kres.rcode.NOERROR)
+ -- same(cache.clear(), 0, 'full cache clear can be performed')
+ --check_answer('.', kres.type.NS, false)
+
+end
+
+local function test_callback()
+ local test_name = '20r.subtree2.'
+ local test_exactname = true
+ local test_rrtype = nil
+ local test_chunksize = 1
+ local test_prev_state = { works = true }
+ local function check_callback(name, exact_name, rr_type, chunk_size, callback, prev_state, errors)
+ is(errors.count, 1, 'callback received correct # of removed records')
+ is(test_name, name, 'callback received subtree name')
+ is(test_exactname, exact_name, 'callback received exact_name')
+ is(test_rrtype, rr_type, 'callback received rr_type')
+ is(test_chunksize, chunk_size, 'callback received chunk_size')
+ is(check_callback, callback, 'callback received reference to itself')
+ is(type(errors), 'table', 'callback received table of errors')
+ same(test_prev_state, prev_state, 'callback received previous state')
+ return 666
+ end
+ same(cache.clear(test_name, test_exactname, test_rrtype, test_chunksize, check_callback, test_prev_state),
+ 666, 'first callback return value is passed to cache.clear() caller')
+ local cnt_before_wait = cache.count()
+ worker.sleep(0.2)
+ is(cnt_before_wait, cache.count(), 'custom callback can stop clearing')
+end
+
+local function test_subtree_limit() -- default limit = 100
+ res = cache.clear('subtree2.', false, nil)
+ ok(res.chunk_limit,
+ 'chunk_size limit must be respected')
+ is(res.count, 100,
+ 'chunk_size limit must match returned count')
+
+ -- callbacks are running in background so we can now wait
+ -- and later verify that everything was removed
+ -- 200 RRs, 100 was removed in first call
+ -- so the rest should be removed in single invocation of callback
+ -- hopefully the machine is not too slow ...
+ worker.sleep(0.1)
+ res = cache.clear('subtree2.', false, nil)
+ is(res.count, 0,
+ 'previous calls + callbacks must have removed everything')
+end
+
+local function test_apex()
+ check_answer('a negative proof is still present in cache',
+ 'aaaaa.b.subtree1.', kres.type.TXT, kres.rcode.NXDOMAIN)
+
+ local prev_count = cache.count()
+ ok(prev_count > 0, 'previous subtree clearing did not remove everything')
+ res = cache.clear('.', false, nil, 10000)
+ is(res.count, prev_count, 'clear on root removed everyting including proofs')
+ check_answer('exact match on qname must flush negative proofs for owner from cache',
+ 'a.b.subtree1.', kres.type.NULL, kres.rcode.SERVFAIL)
+end
+
+local function test_root()
+ check_answer('root apex is still in cache',
+ '.', kres.type.NS, kres.rcode.NOERROR)
+ res = cache.clear('.', true)
+ check_answer('root apex is in no longer cache',
+ '.', kres.type.NS, kres.rcode.SERVFAIL)
+ check_answer('some other item is still in cache',
+ '16r.subtree2.', kres.type.A, kres.rcode.NOERROR)
+
+ local prev_count = cache.count()
+ res = cache.clear('.')
+ is(res.count, prev_count, 'full clear reports correct number of entries')
+ is(cache.count(), 0, 'clearing root clears everything')
+end
+
+local function test_complete_flush()
+ local prev_count = cache.count()
+ res = cache.clear()
+ is(res.count, prev_count, 'full clear reports correct number of entries')
+ is(cache.count(), 0, 'cache is empty after full clear')
+end
+
+local function test_cache_used(lower, upper)
+ return function()
+ local usage = cache.stats().usage_percent
+ ok(usage >= lower and usage <= upper, string.format('cache percentage usage is between <%d, %d>', lower, upper))
+ end
+end
+
+return {
+ test_cache_used(0, 1),
+ import_zone,
+ test_cache_used(11, 12),
+ test_exact_match_qtype,
+ test_exact_match_qname,
+ test_callback,
+ import_zone,
+ test_subtree,
+ test_cache_used(10, 11),
+ test_subtree_limit,
+ test_cache_used(5, 6),
+ test_apex,
+ import_zone,
+ test_root,
+ import_zone,
+ test_complete_flush,
+ test_cache_used(0, 1),
+}
diff --git a/daemon/cache.test/insert_ns.test.integr/deckard.yaml b/daemon/cache.test/insert_ns.test.integr/deckard.yaml
new file mode 100644
index 0000000..7f99679
--- /dev/null
+++ b/daemon/cache.test/insert_ns.test.integr/deckard.yaml
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+programs:
+- name: kresd
+ binary: kresd
+ additional:
+ - --noninteractive
+ templates:
+ - daemon/cache.test/insert_ns.test.integr/kresd_config.j2
+ - tests/integration/hints_zone.j2
+ configs:
+ - config
+ - hints
+noclean: True
diff --git a/daemon/cache.test/insert_ns.test.integr/kresd_config.j2 b/daemon/cache.test/insert_ns.test.integr/kresd_config.j2
new file mode 100644
index 0000000..6da4f4f
--- /dev/null
+++ b/daemon/cache.test/insert_ns.test.integr/kresd_config.j2
@@ -0,0 +1,89 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+{% for TAF in TRUST_ANCHOR_FILES %}
+trust_anchors.add_file('{{TAF}}')
+{% endfor %}
+
+{% raw %}
+-- insert NS record pointing to a non-delegated DNS server
+cache.open(1*MB)
+cache.clear()
+trust_anchors.remove('.')
+
+local ffi = require('ffi')
+local c = kres.context().cache
+ns_name = todname('ns.example.com')
+local ns_addr = '\1\2\3\4'
+local rr = kres.rrset(ns_name, kres.type.A, kres.class.IN, 3600999999)
+assert(rr:add_rdata(ns_addr, #ns_addr))
+assert(c:insert(rr, nil, ffi.C.KR_RANK_SECURE))
+
+rr_ns = kres.rrset(todname('example.com'), kres.type.NS, kres.class.IN, 3600)
+assert(rr_ns:add_rdata(ns_name, #ns_name))
+assert(c:insert(rr_ns, nil, bit.bor(ffi.C.KR_RANK_AUTH, ffi.C.KR_RANK_INSECURE)))
+
+c:commit()
+assert(cache.count() > 0)
+
+-- from now on queries for domain example.com should go directly to IP addr 1.2.3.4
+
+-- Disable RFC5011 TA update
+if ta_update then
+ modules.unload('ta_update')
+end
+
+-- Disable RFC8145 signaling, scenario doesn't provide expected answers
+if ta_signal_query then
+ modules.unload('ta_signal_query')
+end
+
+-- Disable RFC8109 priming, scenario doesn't provide expected answers
+if priming then
+ modules.unload('priming')
+end
+
+-- Disable this module because it makes one priming query
+if detect_time_skew then
+ modules.unload('detect_time_skew')
+end
+
+_hint_root_file('hints')
+verbose(true)
+{% endraw %}
+
+net = { '{{SELF_ADDR}}' }
+
+{% if DO_IP6 == "true" %}
+net.ipv6 = true
+{% else %}
+net.ipv6 = false
+{% endif %}
+
+{% if DO_IP4 == "true" %}
+net.ipv4 = true
+{% else %}
+net.ipv4 = false
+{% endif %}
+
+{% if QMIN == "false" %}
+option('NO_MINIMIZE', true)
+{% else %}
+option('NO_MINIMIZE', false)
+{% endif %}
+
+
+-- Self-checks on globals
+assert(help() ~= nil)
+assert(worker.id ~= nil)
+-- Self-checks on facilities
+assert(cache.stats() ~= nil)
+assert(cache.backends() ~= nil)
+assert(worker.stats() ~= nil)
+assert(net.interfaces() ~= nil)
+-- Self-checks on loaded stuff
+assert(net.list()[1].transport.ip == '{{SELF_ADDR}}')
+assert(#modules.list() > 0)
+-- Self-check timers
+ev = event.recurrent(1 * sec, function (ev) return 1 end)
+event.cancel(ev)
+ev = event.after(0, function (ev) return 1 end)
diff --git a/daemon/cache.test/insert_ns.test.integr/nondelegated_auth.rpl b/daemon/cache.test/insert_ns.test.integr/nondelegated_auth.rpl
new file mode 100644
index 0000000..6a0a32a
--- /dev/null
+++ b/daemon/cache.test/insert_ns.test.integr/nondelegated_auth.rpl
@@ -0,0 +1,59 @@
+; SPDX-License-Identifier: GPL-3.0-or-later
+; config options
+; target-fetch-policy: "0 0 0 0 0"
+; name: "."
+ stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
+ do-ip6: no
+CONFIG_END
+
+SCENARIO_BEGIN Delegation explicitly added into cache must be followed
+
+; ns.example.com.
+RANGE_BEGIN 0 100
+ ADDRESS 1.2.3.4
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+example.com. IN NS
+SECTION ANSWER
+example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+ns.example.com. IN A 1.2.3.4
+ENTRY_END
+
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+www.example.com. IN A
+SECTION ANSWER
+www.example.com. IN A 10.20.30.40
+SECTION AUTHORITY
+example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+ns.example.com. IN A 1.2.3.4
+ENTRY_END
+RANGE_END
+
+STEP 1 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+www.example.com. IN A
+ENTRY_END
+
+; recursion happens here.
+STEP 10 CHECK_ANSWER
+ENTRY_BEGIN
+MATCH flags rcode question
+REPLY QR RD RA NOERROR
+SECTION QUESTION
+www.example.com. IN A
+SECTION ANSWER
+www.example.com. IN A 10.20.30.40
+ENTRY_END
+
+SCENARIO_END
diff --git a/daemon/cache.test/testroot.zone b/daemon/cache.test/testroot.zone
new file mode 100644
index 0000000..2799d33
--- /dev/null
+++ b/daemon/cache.test/testroot.zone
@@ -0,0 +1,1257 @@
+; SPDX-License-Identifier: GPL-3.0-or-later
+; File written on Wed Aug 15 09:23:14 2018
+; dnssec_signzone version 9.13.0-dev
+. 86400 IN SOA rootns. you.test. 2017071101 1800 900 604800 86400
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+; resign=20460416024207
+. 86400 IN NS rootns.
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+; resign=20460416024207
+. 86400 IN NSEC rootns. NS SOA RRSIG NSEC DNSKEY
+. 86400 IN RRSIG NSEC 8 0 86400 20460416024207 20180815062314 48409 . aLdes4mtohdcKA7/kyOdDrCUA72c7DRuK86yxOl3p+5mDarjzBw2Q02b nXEgWoY2RdMJ+KlkxcU87Ojl/p3sIF9RwHlzvW09iXznPyLVTPwD/mnq /5onoMPW4dLbwVIIrFgjhuF/YfN+XCyKoKIJQgB2Qdoo4ppWqeUZXOgU byoPWpzuBupMmrwjownmJLO3bUFUHDaNkIXFi3KwdvhdYj28bP4Z9P4A 1RAKdmU4C24f0auTJDIVDFj4v0ENXzpvDKJyX/VOyLR5+EXwp4YtO1vl TjWueCrTREYDZzXYJgtYHvMDVNQ1uZ+6YCLE7wrgCTQYne9uNp6eAZH3 oFIPTw==
+; resign=20460416024207
+. 1814400 IN DNSKEY 257 3 8 AwEAAcliJP8Jh/RjL3c8eaUj8dzVdEksENKubqVA5FdrDJ2rC0O/bGG/ MVZt+WacE1o1mRVwTT/TrhhZUAzZ+qOcpB+IWxURsR4vVqVwakHMny7D 2aLXKoVXwTo/VhAQtHDw5G9bxGgwybPUtd5Vz6EIenUsmNYZ+Spde4l8 vpw7UISVL6q0C1mwHMN18P/1yfHmbkS19b6B1S9Y2aputccF1lso3yiF Ig7UNqqD4PNxSo4jByDnajQSP3qg/LSJSOnzBIumb8wc6svxgugy/pxr BFKgGGk4/JdJCKufdfU5jFX4fJ3HM37G/RccrtGhIf2Z1utoOyaILoa9 wT3O1WaYG/U=
+. 1814400 IN RRSIG DNSKEY 8 0 1814400 20460416024207 20180815062314 48409 . MiiRlBAgMnadkm6Y/IDLGiE9Y9xvGU0u9IYD1cAddUMpYAwGe5584lfj 1L/Pdg+OeJiGDfFSD7m3ppX18wIeo5eWHmdCO1/nEAdPl0u/XDB/avtj o3Q34szjOV/sA3s5a3Kc+DFrBiZiTA5BwMIHZX4vvITf2cEq2K4K39Iv Cg1blSathklWkpgYIPttpZIcIt5vxoe9e0aqar6FLOCWJ68noreCIenR XmzhMW+l7kOBoKOvkyv1lcDM0zWXI9r5lqAqJB0mWsCiR+VloxSbFii7 kjUDju8BqXu2G8YzM7y0vMytMafjfLsj7bHvQ1HefOht6Xzi1jRHblEh GGQ8UA==
+; resign=20460416024207
+100r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
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+; resign=20460416024207
+rootns. 86400 IN A 198.41.0.4
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+; resign=20460416024207
+rootns. 86400 IN NSEC subtree1. A RRSIG NSEC
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+; resign=20460416024207
+102r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+102r.subtree2. 86400 IN NSEC 103r.subtree2. A RRSIG NSEC
+102r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . PE/1zyqvetDmu+d7yFhICfmNWl1AmSZ1K5tKtb04wz+I1aihwWkozCuC hLskRAIrhogNSFDjVqhM2F1HFYm3ACkr3vvWxsTAk4hnvIIw1TVj+iqU ZTpXNKnS7UarPxM8a5fctME2mgPSQnsAzJRlkInpT450Ls7qhTpqEREx wMAY7fQx+Y5zdg90rEINJBdKJgw7K8ES3bm1JwEIpkjw4I5NZhyAS026 2fW6x5UaTGWhV1Qa7YVwdXrEDxcsyb/FR/N0AofcP0JrQ8/UfPJNoO3U rtUigRA8tDapiQuSTFaYb1thtqMgGtrJqxjDRU82I75HBZnhhFilOGUD fcVq9g==
+; resign=20460416024207
+104r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+104r.subtree2. 86400 IN NSEC 105r.subtree2. A RRSIG NSEC
+104r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . BrGAn5NmHS74Ru+CcjBzjUamO6en8GaTg+fOuSaECpFNCx/rnFQziS/a gZs44Mlc3IdXLEeo3GI21Uqf/mNeGqfl+TCnUfnevy+1Gl2093dtma4/ LNHMd9BxDmXe94WQVp4xJOLbICv4aaKIhGD7w4ck9cMk1r8p4ngvsvoV kn9uLl1lx14yddufdS8B/NGvzeqRlJNdyfZJg47pQfghgg+qLbmmzqHr Rt+ke0Vge4Nur3PsNs/daYb02OWqWA5YLbljRaKqatEn95ohkrfl/CMe rZ3b3gcR6dowj9+dIkGODCQhrzqtk3v1QAEkYq5LJDPPnhXYduNWqsz/ 5F/m/g==
+; resign=20460416024207
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+a.b.subtree1. 86400 IN RRSIG A 8 3 86400 20460416024207 20180815062314 48409 . BTJSG6mn5eRo2GDyw8lT3S7POU6BBrB2w3ULx8+BY8aoEHzak8Ul/abD fqneEji+subHFGpMwQXFtzKfnwTTRHyHS2P7FZQO3l7b+T2oDRZn9B0d mrmGQRmv5XrTDlO0WRYlRsWSMalkbUEul6L9q3koCCtXd4GCxDh20tk7 o27pKtuO0ALptDLIMXoVdhRhTBd+qARVJrg2u/XyUzlwqfgZTsY6SkyN mEYvK4UCM1RkhqCqo3NBNmR7islmWVPM3Ax8uTssCf5T+MUN+gNT6Co+ zRXX71qGw6hpQFxWe1dA9PCna4ZoWPIfx6A666blMrciwbYTQL8xUEPS 5RmRtw==
+; resign=20460416024207
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+a.b.subtree1. 86400 IN RRSIG TXT 8 3 86400 20460416024207 20180815062314 48409 . gN77jXi+ntj3SeXk2WprymZGcwPEXY/0w1svtsP2RXijvXwOlWlpmsSK +SnZFtkSRKwJXEY1nSDW3UORaDzzZrraMxCtjtt2Vi77Uqi97PdaRmk+ +IRcJBNQ3PywGRdqw1MZuPlyKbmGe8B4PE96d6ya4fXtvL8tuMU4L7uP h2Wn4sB1eSFpH5rGrytPMyv6W4T7JubL6+R1YdmQBAARJXnIqN8WlOYM JiZtQl7kdnPOxxhHZCzlFOP1Ci934u9jh93ynJPbF9dJG75f74+sWw2k RHZUu7SkphoPsVR7nhulAHcPB805yxWPtmMC2Rsq+RGbLpfgFENPsnxv VZa5Wg==
+; resign=20460416024207
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+a.b.subtree1. 86400 IN RRSIG AAAA 8 3 86400 20460416024207 20180815062314 48409 . cLipbUelm96/75NoXOJR3atJKr9fjYaz4lu4CQBREmQ7eUwkGfDGW7jj ar60VA2OSVT1Q3SxsvKjZ9OjSDLtPbhVeIabBKhDQWULy3c0rBgblMfc xIa++QItLiuxyfj3EiwGfwkIlwuM0jg4sByisvWBeUwsIv9+nHJYZERf p96DhsZXC4OTba5Tai2sJ8CmYINWQBu8GRb9wrtrEBGg2LyZifXRirTB RoTuXPOSScURU4VmzyJrVLuNipsd9V6Dnq6J4Yuc21ws9ZrB7nF1TYqr zmW1x86umJHM1Evw6NWrHX4rMgiTiwJR0ju4uc7FDZ8irdtmcPGr0C9F 3hycmg==
+; resign=20460416024207
+a.b.subtree1. 86400 IN NSEC 100r.subtree2. A TXT AAAA RRSIG NSEC
+a.b.subtree1. 86400 IN RRSIG NSEC 8 3 86400 20460416024207 20180815062314 48409 . ipRQluXZcAsYQqTMnV6VDykJym1bh4VujIFvWnM+oQxZEpsreqwl3hFM INUapADed66F8p7goYlC9oKdbOfqLAJSBvPyL2MJIPEifnTeFI5SiQe7 u2NxsNn1glotVBHGL37EOf55xvbO9N/y8fnIjtOD4g8kJBthaeyOCsc+ KbcOcBce9y9f/meoibQc9plyQSeGhXYtc/9jliNmnJehG+y4WUZpmeOc sy0NB3VDHMwNigxUJl4+ezSGlR7TLReeGXX7BGBSdtDigz8uDpi5vmXk Ebmxjr1gSVh++5cZV2l6IhA6l6/ZNWh8EnYWnydHZR/FdMZ/xnJP9fdK bN5Kcg==
+; resign=20460416024207
+105r.subtree2. 86400 IN A 192.0.2.1
+105r.subtree2. 86400 IN RRSIG A 8 2 86400 20460416024207 20180815062314 48409 . FBlsr7zNihecaykcv61PL0Huh8SECrXoZ/unuWxmT+ZqDKjmfFGxoG/v MgmmJ9r/sfZ29e9mMnfBtXj/xJLW1dbHYwFZSt4ZeGZ+W/ohgCKVW0Fb XJTZacoWJtXhgObs6gjoab5IPqle3dgqUsP6xNvzonReL1IW7+45QRh2 nWU+4j5OTL/eO1mNXU841PtvmmotwDamR6aSoNr3X99Hwd3/3yJtRIIW JYVAr5G49m+YickDVH2gvJ+JZkswzGfbQgXqThUiSMBfHw23LQk7A1ZH aStSqsRcJt/w1pTl5cEDpnq2yFelQdmCE1DqnUIOkSTRdemk4ObnXFOW FArXZw==
+; resign=20460416024207
+105r.subtree2. 86400 IN NSEC 106r.subtree2. A RRSIG NSEC
+105r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . uSMqXmIDnP/m7EW1gMGI7N8Wp6x142d8xTtJTFJ4mOPbyrKBRDDdzEEQ iiistwQThYUZkM6gWpiE0yfTvUI1pP4Aa6zASUExJoO0P+CEmHTmRJ9c 2sCqottCOirXivxfC2PoxXlIZ1nQketizjzMXErjKogU4/HaaaxiDLXh P56bAeFkIqGKujbdRhVMArugKvbbkjVjE1iXznG/bzKqOXldi7JNQbxx cc6+fZTs4Ahg2H+FtQLH+WFbD+JBLQzvc2WnjqvNq5MGTSKxcuGDA80O CLEFs/7zhEBSZYhBGoVXqywvDR4j4Lox02g5wUpWlXK10pnU0ppr6Asx bM4wLA==
+; resign=20460416024207
+106r.subtree2. 86400 IN A 192.0.2.1
+106r.subtree2. 86400 IN RRSIG A 8 2 86400 20460416024207 20180815062314 48409 . kIpw+6J1f7ByzuP9ynrP4bmQTZaXCF5CjRgDLWoIcU+mnqidsWwjZRHb 1q8OtXcUUEfwTNc6mqvUnWHXQHARTIjZ/xtQeAwfpq8ZGjmplXykmlDX Fl3p4cleG3QM+uhHnZRncbVSEXnOA8H9PFHpDSi9bBVLmqEHOot0evxA 4wfUkGQLGpa2MxzAXymWO6A1RdntuL+gBbRYgGlR0RnZycMMLtRNv+ou QhFEuPw/apF+fqmV82dX+XL8kEWPflDhOBbZqMO53sKFj5MG+gXBiPid G5VFgyFqsc4atV/PMk5RvQ+jRE8PgC2lWmdmnOL9D/RT0O4FjrXbq+4/ LEuBWg==
+; resign=20460416024207
+106r.subtree2. 86400 IN NSEC 107r.subtree2. A RRSIG NSEC
+106r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . OnRo2W1aBYVqzLQsgUF2zisHiaGnlbp1DIC3bcReDq3hKe1EqPtqffho 3UcvnzVOIp31qTjr1ntoWhNt8mOJMDzn2/UUSPQkAj8Laj1lOtSnLzm/ b8c1eFb45LTsZHic4DZoEwlhtwV3EmwKJWXMkDQZdV5x+g2RGGZ2W30t tCZllImuJbHLyCB7Mwy0ipGrVQ9iO2uCITURICTiDGKwyIox0Dr/0la6 7ZtknDiqG27PC4me5AASkGj3DaLo8ZmlBudYDG4sh/B+tryvdrhizgcK XoIrLqNjB18d9+CgKKVmRLZr6yY9aw7XSlP8euPJmQZv20CyCxhG5S+e dpCdAw==
+; resign=20460416024207
+107r.subtree2. 86400 IN A 192.0.2.1
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+124r.subtree2. 86400 IN A 192.0.2.1
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+128r.subtree2. 86400 IN A 192.0.2.1
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+132r.subtree2. 86400 IN A 192.0.2.1
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+135r.subtree2. 86400 IN A 192.0.2.1
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+136r.subtree2. 86400 IN A 192.0.2.1
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+138r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+101r.subtree2. 86400 IN A 192.0.2.1
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+101r.subtree2. 86400 IN NSEC 102r.subtree2. A RRSIG NSEC
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+103r.subtree2. 86400 IN A 192.0.2.1
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+125r.subtree2. 86400 IN A 192.0.2.1
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+140r.subtree2. 86400 IN A 192.0.2.1
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+141r.subtree2. 86400 IN A 192.0.2.1
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+121r.subtree2. 86400 IN A 192.0.2.1
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+142r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
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+144r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+146r.subtree2. 86400 IN A 192.0.2.1
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+147r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+147r.subtree2. 86400 IN NSEC 148r.subtree2. A RRSIG NSEC
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+; resign=20460416024207
+148r.subtree2. 86400 IN A 192.0.2.1
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+149r.subtree2. 86400 IN A 192.0.2.1
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+149r.subtree2. 86400 IN NSEC 14r.subtree2. A RRSIG NSEC
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+14r.subtree2. 86400 IN A 192.0.2.1
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+154r.subtree2. 86400 IN A 192.0.2.1
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+155r.subtree2. 86400 IN A 192.0.2.1
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+156r.subtree2. 86400 IN A 192.0.2.1
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+157r.subtree2. 86400 IN A 192.0.2.1
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+158r.subtree2. 86400 IN A 192.0.2.1
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+159r.subtree2. 86400 IN A 192.0.2.1
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+143r.subtree2. 86400 IN A 192.0.2.1
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+164r.subtree2. 86400 IN A 192.0.2.1
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+165r.subtree2. 86400 IN A 192.0.2.1
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+166r.subtree2. 86400 IN A 192.0.2.1
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+167r.subtree2. 86400 IN A 192.0.2.1
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+168r.subtree2. 86400 IN A 192.0.2.1
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+145r.subtree2. 86400 IN A 192.0.2.1
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+16r.subtree2. 86400 IN A 192.0.2.1
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+170r.subtree2. 86400 IN A 192.0.2.1
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+176r.subtree2. 86400 IN A 192.0.2.1
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+177r.subtree2. 86400 IN A 192.0.2.1
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+178r.subtree2. 86400 IN A 192.0.2.1
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+13r.subtree2. 86400 IN A 192.0.2.1
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+17r.subtree2. 86400 IN A 192.0.2.1
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+180r.subtree2. 86400 IN A 192.0.2.1
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+196r.subtree2. 86400 IN A 192.0.2.1
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+200r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+179r.subtree2. 86400 IN A 192.0.2.1
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+179r.subtree2. 86400 IN NSEC 17r.subtree2. A RRSIG NSEC
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+197r.subtree2. 86400 IN A 192.0.2.1
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+35r.subtree2. 86400 IN A 192.0.2.1
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+195r.subtree2. 86400 IN A 192.0.2.1
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+195r.subtree2. 86400 IN NSEC 196r.subtree2. A RRSIG NSEC
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+37r.subtree2. 86400 IN A 192.0.2.1
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+37r.subtree2. 86400 IN NSEC 38r.subtree2. A RRSIG NSEC
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+38r.subtree2. 86400 IN A 192.0.2.1
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+39r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+3r.subtree2. 86400 IN AAAA 2001:db8::
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+40r.subtree2. 86400 IN A 192.0.2.1
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+41r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+42r.subtree2. 86400 IN A 192.0.2.1
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+43r.subtree2. 86400 IN NSEC 44r.subtree2. A RRSIG NSEC
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+184r.subtree2. 86400 IN A 192.0.2.1
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+46r.subtree2. 86400 IN A 192.0.2.1
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+47r.subtree2. 86400 IN A 192.0.2.1
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+47r.subtree2. 86400 IN NSEC 48r.subtree2. A RRSIG NSEC
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+48r.subtree2. 86400 IN A 192.0.2.1
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+49r.subtree2. 86400 IN A 192.0.2.1
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+49r.subtree2. 86400 IN NSEC 4r.subtree2. A RRSIG NSEC
+49r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . hdzkIuLtYPu/vNfcHDQKqNfpEZiya6TzbBl+TpkHVU3B6VhD56Vlu6rg j36ZBdTVBk8X6hB6rFjfBN0zFBz1IELsfrKIM0tQbceyZcvAtal07nCE bmDOjYBwKhgJAJpIm9FGHJp1NXj/QtKDaLgjjG0pDSieSb1GVBqVRurg D4F1Uu50O0BkvFSrtaNkPpvfnVoDl6jcXW7SxM+9AzNZVN8WXxGP5qkf 5zrAhV1AdpadSJRkCG/K2QE8s1ieNKnHunrbwZJddQmpI45GKqx6Y16m sujnAFuMhQVpbJu96ZJC+bAcDwZJq0k2yRRhouP7fGG8U59jDtdLrExp ombApQ==
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+51r.subtree2. 86400 IN A 192.0.2.1
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+52r.subtree2. 86400 IN A 192.0.2.1
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+53r.subtree2. 86400 IN A 192.0.2.1
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+54r.subtree2. 86400 IN A 192.0.2.1
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+65r.subtree2. 86400 IN A 192.0.2.1
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+65r.subtree2. 86400 IN NSEC 66r.subtree2. A RRSIG NSEC
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+66r.subtree2. 86400 IN A 192.0.2.1
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+66r.subtree2. 86400 IN NSEC 67r.subtree2. A RRSIG NSEC
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+67r.subtree2. 86400 IN A 192.0.2.1
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+67r.subtree2. 86400 IN NSEC 68r.subtree2. A RRSIG NSEC
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+68r.subtree2. 86400 IN A 192.0.2.1
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+31r.subtree2. 86400 IN NSEC 32r.subtree2. A RRSIG NSEC
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+6r.subtree2. 86400 IN A 192.0.2.1
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+6r.subtree2. 86400 IN NSEC 70r.subtree2. A RRSIG NSEC
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+44r.subtree2. 86400 IN A 192.0.2.1
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+44r.subtree2. 86400 IN NSEC 45r.subtree2. A RRSIG NSEC
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+71r.subtree2. 86400 IN A 192.0.2.1
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+71r.subtree2. 86400 IN NSEC 72r.subtree2. A RRSIG NSEC
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+72r.subtree2. 86400 IN A 192.0.2.1
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+73r.subtree2. 86400 IN A 192.0.2.1
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+74r.subtree2. 86400 IN A 192.0.2.1
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+76r.subtree2. 86400 IN A 192.0.2.1
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+80r.subtree2. 86400 IN A 192.0.2.1
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+86r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+98r.subtree2. 86400 IN A 192.0.2.1
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+; resign=20460416024207
+69r.subtree2. 86400 IN A 192.0.2.1
+69r.subtree2. 86400 IN RRSIG A 8 2 86400 20460416024207 20180815062314 48409 . H9e3SuKHH/ds/qxJExQwItamzQmLsoYnh4u8aAAIOHg1+LT2P0Sn/KGw ISMl/McYEeOXlFt2SGwC+3X96MlXC9GpsMxtPLy86Jt6p/O8gVdSpr7P y2bFB2Ioz1I64mGKTN+AAJtl85zeV5DbEeQcB1uCtHGdh3aGhgS/CT82 b0eFOAuLiIf45Wy5h5DFZz0n9XAUJGOCejUUqZlEdfSJ/9Y9KCjFPOf6 XDr1Ts6eJhukd2FnGImAVRsCeYuCtkm3GjSkxYG3QgqJNDUDpk++Xzw+ 5kNiOZgQ20y8d+VBfC5IJ7mZlEuUCO2Bw71EQC/BbHVkQdgDbKe1oFHn 39Gd6w==
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+; resign=20460416024207
+85r.subtree2. 86400 IN A 192.0.2.1
+85r.subtree2. 86400 IN RRSIG A 8 2 86400 20460416024207 20180815062314 48409 . f3ogUidaXG4YfcQ1pk360EY2gIoH9khcvUAnb+suATWZgyBzhgzzFLcW r8hB+tF4uW7fpECLic2w+BmZUFX4yGWVDYldS0Nywvj0vApNWAnrn+3P RdNJ7zkI5/ZO1IZDGTGaRZlG1wkIv8KL4lXjRHjw/VU6vMgepld5cCNJ 5tYkhBdHKvltkBqsD3owQ1nCuvfDfIQp0z6H5gCx5EpoNsqKz2O9Z8Mr hjBvl/yVhDrvXRbN0d4o3pHdg1ozm2azNiwRllgCD/vxV48Uw7ZOkFUk Z/e0kgTOsKHCCGCV976OjH8ryFPiVwD2r7tAbzzrEctDtL3pgKocTknh aUSfsA==
+; resign=20460416024207
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+85r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . Nc2ArE889yWghwl7jvS5+GSHcYV7Of1aX+YDPThgr+DxZS68jKXwXhrQ NBVMGe/tPdCML/Ka7rggAUmgQJmrx4JY/s1tJMbm1GUJr/rVd23Qt2/3 5Y0OQF76JeNfKtyUfdr2K2nIKtvte0zPq4RlNa0NWm4Lmm53PES4PnO3 w5cnnxwePHMN8aQp5GucyFCdw+Ah8pRGZLRVbPJgj+iL+YhT4k4mQeI8 yoMuC46icqMRzg0lGHaBGeSE8uD1GVjbwOpngqWjB8vdYDmBX1vWNt4P dVII2ybrBIwfnqnGZptNqhs0roKaLGz2GA/0b05bwl1jHL9AhYZ5Zin2 Xz1JVw==
+; resign=20460416024207
+77r.subtree2. 86400 IN A 192.0.2.1
+77r.subtree2. 86400 IN RRSIG A 8 2 86400 20460416024207 20180815062314 48409 . QAc9wnWC//xMkla4VISWRiYme7K9/K1PJc+oLaJ+slJJSjbqqbqcqUCx EjDCw7V+a9FvnSTBs3tGpBvnQfGBT8LwbVzgrLA3p7Ad0JX2O5XlaYU7 tcbDatZdRoQkB/rxpUcPzEKe8t3mT4nzavyK+QTF6gbfrcGLRRrdADwh lUOmada+Hz/339BkLYHEvFHCdnmovmtBUOQPjgVpj2pFWPZ+cAOw5VJV 7/mLFwijuoe22Yq9E9WaI6YWJIeobu+Dht13FlUkiAgQeqyDAOCnmLjp Hf2VRjXvRktliYOHoM1gBG9c7qUHIHtOS4oXRT+0ElN9CBBovTzdIoo6 WML2DQ==
+; resign=20460416024207
+77r.subtree2. 86400 IN NSEC 78r.subtree2. A RRSIG NSEC
+77r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . jp+KYsenqjl2t7tBVdmg1VVQoq1eHgqnnGjLeVU3oGNLtwwvQWEl0fV0 MNMuBUzH5jhMw8L8VvmFihIa9RQga3PQDI+CnrvRH1YNM8OAXzaWWWrA Fs4cS/cCUo3dbfgL7bxxTYmYYG96N4QbTvBE6M/N8bvquMikTdWjsMBy rz3ZsMCoVC8CXr+i06vevOKZaqfJ08hYg/hbW8+h/XtgXaQZjLEGJ68X osO+20PkOHvRD7X3RTHVlDrT2ZZOjCokNEgl4/alp5t5xXi6A3hD0HfF T/tzTiBi8gVw/PXJRgPV8rE3BXCf7Cqwwtei/28Knkf13zHD8fOmrV08 PuQfKQ==
+; resign=20460416024207
+87r.subtree2. 86400 IN A 192.0.2.1
+87r.subtree2. 86400 IN RRSIG A 8 2 86400 20460416024207 20180815062314 48409 . fPXLpsy1AqCF8HpnyeICWkuMtVpa87akqhqWJdKTG6pKKVQR0swtNaYE e3aLriYm92PGuYzdIIrQLyBlRqfdsyNIbhcGSufBplGt0hUR6CCFP6eX wuOBqw2lhrNReC/GM+E1wjvZTfZ1qwc+JOA462jXX0t9PSrTTlFM5CEj /91mOZXJ8DTYHeDPy3jvPEjhR/137fC0WhHHrMNKI7wT0dNSObq49DXu IzqrtNpzEWtiDYQdhk37hraueb0BNFmVONLqve2Q51D320qi953XR3pz olGQ9UrI7Eeo4kbwSGLo8U7mIH2wS65RHzrO8+4U+W/pwHXLoGnQxiRw e1NfdQ==
+; resign=20460416024207
+87r.subtree2. 86400 IN NSEC 88r.subtree2. A RRSIG NSEC
+87r.subtree2. 86400 IN RRSIG NSEC 8 2 86400 20460416024207 20180815062314 48409 . JyZPoj5NUaz3hnlq+EoPq2mozjKk1VsVmD9Ipc7M8chTIxjiYLnyRVcx ZeE5p+M19oXK71RPwSdYH2UjiFCOa4cZntkIny972BYEDtezGdSYzz/z VMDf9r6XOBeECHiIAaF6q+ptR0K47188Q6+eTlcPZMNSDrckRFBfI/qT 9R99kCvDJ5WyBTY+2aT2qCP0+INJi/XQfOj3RuuJhxLh7UBbicdR43fb QW//otvC9Hb6RwxZFkrM283ddAcjA/0/L4bPmV5AQo1lGeO6e/5jmBay /uJD4HVAHwW3T7rbQyMOWjoIGyJreEaSiE2ykBptwscbgrBOygyOs2wX zZ8EEg==
+; resign=20460416024207
diff --git a/daemon/cache.test/testroot.zone.unsigned b/daemon/cache.test/testroot.zone.unsigned
new file mode 100644
index 0000000..c790cc4
--- /dev/null
+++ b/daemon/cache.test/testroot.zone.unsigned
@@ -0,0 +1,216 @@
+; SPDX-License-Identifier: GPL-3.0-or-later
+. 86400 SOA rootns. you.test. 2017071101 1800 900 604800 86400
+. 86400 NS rootns.
+rootns. 86400 A 198.41.0.4
+
+subtree1. 86400 TXT "txt exists"
+subtree1. 86400 A 192.0.2.1
+b.subtree1. 86400 TXT "txt exists"
+b.subtree1. 86400 A 192.0.2.2
+a.b.subtree1. 86400 TXT "txt exists"
+a.b.subtree1. 86400 A 192.0.2.3
+a.b.subtree1. 86400 AAAA 2001:db8::
+
+; subtree2. is empty non-terminal
+1r.subtree2. 86400 AAAA 2001:db8::
+2r.subtree2. 86400 AAAA 2001:db8::1
+2r.subtree2. 86400 AAAA 2001:db8::2
+3r.subtree2. 86400 AAAA 2001:db8::
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diff --git a/daemon/engine.c b/daemon/engine.c
new file mode 100644
index 0000000..82505b2
--- /dev/null
+++ b/daemon/engine.c
@@ -0,0 +1,780 @@
+/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <contrib/cleanup.h>
+#include <ccan/json/json.h>
+#include <ccan/asprintf/asprintf.h>
+#include <dlfcn.h>
+#include <uv.h>
+#include <unistd.h>
+#include <grp.h>
+#include <pwd.h>
+#include <sys/param.h>
+#include <libzscanner/scanner.h>
+#include <sys/un.h>
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include "daemon/bindings/impl.h"
+
+#include "kresconfig.h"
+#include "daemon/engine.h"
+#include "daemon/ffimodule.h"
+#include "lib/selection.h"
+#include "lib/cache/api.h"
+#include "lib/defines.h"
+#include "lib/cache/cdb_lmdb.h"
+#include "lib/dnssec/ta.h"
+
+/* Magic defaults for the engine. */
+#ifndef LRU_RTT_SIZE
+#define LRU_RTT_SIZE 65536 /**< NS RTT cache size */
+#endif
+#ifndef LRU_REP_SIZE
+#define LRU_REP_SIZE (LRU_RTT_SIZE / 4) /**< NS reputation cache size */
+#endif
+#ifndef LRU_COOKIES_SIZE
+ #if ENABLE_COOKIES
+ #define LRU_COOKIES_SIZE LRU_RTT_SIZE /**< DNS cookies cache size. */
+ #else
+ #define LRU_COOKIES_SIZE LRU_ASSOC /* simpler than guards everywhere */
+ #endif
+#endif
+
+/**@internal Maximum number of incomplete TCP connections in queue.
+* Default is from empirical testing - in our case, more isn't necessarily better.
+* See https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/968
+* */
+#ifndef TCP_BACKLOG_DEFAULT
+#define TCP_BACKLOG_DEFAULT 128
+#endif
+
+/* Cleanup engine state every 5 minutes */
+const size_t CLEANUP_TIMER = 5*60*1000;
+
+/* Execute byte code */
+#define l_dobytecode(L, arr, len, name) \
+ (luaL_loadbuffer((L), (arr), (len), (name)) || lua_pcall((L), 0, LUA_MULTRET, 0))
+
+/*
+ * Global bindings.
+ */
+struct args *the_args;
+
+
+/** Print help and available commands. */
+static int l_help(lua_State *L)
+{
+ static const char *help_str =
+ "help()\n show this help\n"
+ "quit()\n quit\n"
+ "hostname()\n hostname\n"
+ "package_version()\n return package version\n"
+ "user(name[, group])\n change process user (and group)\n"
+ "verbose(true|false)\n toggle verbose mode\n"
+ "option(opt[, new_val])\n get/set server option\n"
+ "mode(strict|normal|permissive)\n set resolver strictness level\n"
+ "reorder_RR([true|false])\n set/get reordering of RRs within RRsets\n"
+ "resolve(name, type[, class, flags, callback])\n resolve query, callback when it's finished\n"
+ "todname(name)\n convert name to wire format\n"
+ "tojson(val)\n convert value to JSON\n"
+ "net\n network configuration\n"
+ "cache\n network configuration\n"
+ "modules\n modules configuration\n"
+ "kres\n resolver services\n"
+ "trust_anchors\n configure trust anchors\n"
+ ;
+ lua_pushstring(L, help_str);
+ return 1;
+}
+
+static bool update_privileges(int uid, int gid)
+{
+ if ((gid_t)gid != getgid()) {
+ if (setregid(gid, gid) < 0) {
+ return false;
+ }
+ }
+ if ((uid_t)uid != getuid()) {
+ if (setreuid(uid, uid) < 0) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/** Set process user/group. */
+static int l_setuser(lua_State *L)
+{
+ int n = lua_gettop(L);
+ if (n < 1 || !lua_isstring(L, 1))
+ lua_error_p(L, "user(user[, group])");
+
+ /* Fetch UID/GID based on string identifiers. */
+ struct passwd *user_pw = getpwnam(lua_tostring(L, 1));
+ if (!user_pw)
+ lua_error_p(L, "invalid user name");
+ int uid = user_pw->pw_uid;
+ int gid = getgid();
+ if (n > 1 && lua_isstring(L, 2)) {
+ struct group *group_pw = getgrnam(lua_tostring(L, 2));
+ if (!group_pw)
+ lua_error_p(L, "invalid group name");
+ gid = group_pw->gr_gid;
+ }
+ /* Drop privileges */
+ bool ret = update_privileges(uid, gid);
+ if (!ret) {
+ lua_error_maybe(L, errno);
+ }
+ lua_pushboolean(L, ret);
+ return 1;
+}
+
+/** Quit current executable. */
+static int l_quit(lua_State *L)
+{
+ engine_stop(the_worker->engine);
+ return 0;
+}
+
+/** Toggle verbose mode. */
+static int l_verbose(lua_State *L)
+{
+ if (lua_isboolean(L, 1) || lua_isnumber(L, 1)) {
+ kr_verbose_set(lua_toboolean(L, 1));
+ }
+ lua_pushboolean(L, kr_verbose_status);
+ return 1;
+}
+
+char *engine_get_hostname(struct engine *engine) {
+ static char hostname_str[KNOT_DNAME_MAXLEN];
+ if (!engine) {
+ return NULL;
+ }
+
+ if (!engine->hostname) {
+ if (gethostname(hostname_str, sizeof(hostname_str)) != 0)
+ return NULL;
+ return hostname_str;
+ }
+ return engine->hostname;
+}
+
+int engine_set_hostname(struct engine *engine, const char *hostname) {
+ if (!engine || !hostname) {
+ return kr_error(EINVAL);
+ }
+
+ char *new_hostname = strdup(hostname);
+ if (!new_hostname) {
+ return kr_error(ENOMEM);
+ }
+ if (engine->hostname) {
+ free(engine->hostname);
+ }
+ engine->hostname = new_hostname;
+ network_new_hostname(&engine->net, engine);
+
+ return 0;
+}
+
+/** Return hostname. */
+static int l_hostname(lua_State *L)
+{
+ struct engine *engine = the_worker->engine;
+ if (lua_gettop(L) == 0) {
+ lua_pushstring(L, engine_get_hostname(engine));
+ return 1;
+ }
+ if ((lua_gettop(L) != 1) || !lua_isstring(L, 1))
+ lua_error_p(L, "hostname takes at most one parameter: (\"fqdn\")");
+
+ if (engine_set_hostname(engine, lua_tostring(L, 1)) != 0)
+ lua_error_p(L, "setting hostname failed");
+
+ lua_pushstring(L, engine_get_hostname(engine));
+ return 1;
+}
+
+/** Return server package version. */
+static int l_package_version(lua_State *L)
+{
+ lua_pushliteral(L, PACKAGE_VERSION);
+ return 1;
+}
+
+/** Load root hints from zonefile. */
+static int l_hint_root_file(lua_State *L)
+{
+ struct kr_context *ctx = &the_worker->engine->resolver;
+ const char *file = lua_tostring(L, 1);
+
+ const char *err = engine_hint_root_file(ctx, file);
+ if (err) {
+ if (!file) {
+ file = ROOTHINTS;
+ }
+ lua_error_p(L, "error when opening '%s': %s", file, err);
+ } else {
+ lua_pushboolean(L, true);
+ return 1;
+ }
+}
+
+/** @internal for engine_hint_root_file */
+static void roothints_add(zs_scanner_t *zs)
+{
+ struct kr_zonecut *hints = zs->process.data;
+ if (!hints) {
+ return;
+ }
+ if (zs->r_type == KNOT_RRTYPE_A || zs->r_type == KNOT_RRTYPE_AAAA) {
+ kr_zonecut_add(hints, zs->r_owner, zs->r_data, zs->r_data_length);
+ }
+}
+const char* engine_hint_root_file(struct kr_context *ctx, const char *file)
+{
+ if (!file) {
+ file = ROOTHINTS;
+ }
+ if (strlen(file) == 0 || !ctx) {
+ return "invalid parameters";
+ }
+ struct kr_zonecut *root_hints = &ctx->root_hints;
+
+ zs_scanner_t zs;
+ if (zs_init(&zs, ".", 1, 0) != 0) {
+ return "not enough memory";
+ }
+ if (zs_set_input_file(&zs, file) != 0) {
+ zs_deinit(&zs);
+ return "failed to open root hints file";
+ }
+
+ kr_zonecut_set(root_hints, (const uint8_t *)"");
+ zs_set_processing(&zs, roothints_add, NULL, root_hints);
+ zs_parse_all(&zs);
+ zs_deinit(&zs);
+ return NULL;
+}
+
+/** Unpack JSON object to table */
+static void l_unpack_json(lua_State *L, JsonNode *table)
+{
+ /* Unpack POD */
+ switch(table->tag) {
+ case JSON_STRING: lua_pushstring(L, table->string_); return;
+ case JSON_NUMBER: lua_pushnumber(L, table->number_); return;
+ case JSON_BOOL: lua_pushboolean(L, table->bool_); return;
+ default: break;
+ }
+ /* Unpack object or array into table */
+ lua_newtable(L);
+ JsonNode *node = NULL;
+ json_foreach(node, table) {
+ /* Push node value */
+ switch(node->tag) {
+ case JSON_OBJECT: /* as array */
+ case JSON_ARRAY: l_unpack_json(L, node); break;
+ case JSON_STRING: lua_pushstring(L, node->string_); break;
+ case JSON_NUMBER: lua_pushnumber(L, node->number_); break;
+ case JSON_BOOL: lua_pushboolean(L, node->bool_); break;
+ default: continue;
+ }
+ /* Set table key */
+ if (node->key) {
+ lua_setfield(L, -2, node->key);
+ } else {
+ lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
+ }
+ }
+}
+
+/** @internal Recursive Lua/JSON serialization. */
+static JsonNode *l_pack_elem(lua_State *L, int top)
+{
+ switch(lua_type(L, top)) {
+ case LUA_TSTRING: return json_mkstring(lua_tostring(L, top));
+ case LUA_TNUMBER: return json_mknumber(lua_tonumber(L, top));
+ case LUA_TBOOLEAN: return json_mkbool(lua_toboolean(L, top));
+ case LUA_TTABLE: break; /* Table, iterate it. */
+ default: return json_mknull();
+ }
+ /* Use absolute indexes here, as the table may be nested. */
+ JsonNode *node = NULL;
+ lua_pushnil(L);
+ while(lua_next(L, top) != 0) {
+ bool is_array = false;
+ if (!node) {
+ is_array = (lua_type(L, top + 1) == LUA_TNUMBER);
+ node = is_array ? json_mkarray() : json_mkobject();
+ if (!node) {
+ return NULL;
+ }
+ } else {
+ is_array = node->tag == JSON_ARRAY;
+ }
+
+ /* Insert to array/table. */
+ JsonNode *val = l_pack_elem(L, top + 2);
+ if (is_array) {
+ json_append_element(node, val);
+ } else {
+ const char *key = lua_tostring(L, top + 1);
+ json_append_member(node, key, val);
+ }
+ lua_pop(L, 1);
+ }
+ /* Return empty object for empty tables. */
+ return node ? node : json_mkobject();
+}
+
+/** @internal Serialize to string */
+static char *l_pack_json(lua_State *L, int top)
+{
+ JsonNode *root = l_pack_elem(L, top);
+ if (!root) {
+ return NULL;
+ }
+ char *result = json_encode(root);
+ json_delete(root);
+ return result;
+}
+
+static int l_tojson(lua_State *L)
+{
+ auto_free char *json_str = l_pack_json(L, lua_gettop(L));
+ if (!json_str) {
+ return 0;
+ }
+ lua_pushstring(L, json_str);
+ return 1;
+}
+
+static int l_fromjson(lua_State *L)
+{
+ if (lua_gettop(L) != 1 || !lua_isstring(L, 1))
+ lua_error_p(L, "a JSON string is required");
+
+ const char *json_str = lua_tostring(L, 1);
+ JsonNode *root_node = json_decode(json_str);
+
+ if (!root_node)
+ lua_error_p(L, "invalid JSON string");
+ l_unpack_json(L, root_node);
+ json_delete(root_node);
+
+ return 1;
+}
+
+/*
+ * Engine API.
+ */
+
+static int init_resolver(struct engine *engine)
+{
+ /* Note: whole *engine had been zeroed by engine_init(). */
+ struct kr_context * const ctx = &engine->resolver;
+ /* Default options (request flags). */
+ ctx->options.REORDER_RR = true;
+
+ /* Open resolution context */
+ ctx->trust_anchors = map_make(NULL);
+ ctx->negative_anchors = map_make(NULL);
+ ctx->pool = engine->pool;
+ ctx->modules = &engine->modules;
+ ctx->cache_rtt_tout_retry_interval = KR_NS_TIMEOUT_RETRY_INTERVAL;
+ /* Create OPT RR */
+ ctx->downstream_opt_rr = mm_alloc(engine->pool, sizeof(knot_rrset_t));
+ ctx->upstream_opt_rr = mm_alloc(engine->pool, sizeof(knot_rrset_t));
+ if (!ctx->downstream_opt_rr || !ctx->upstream_opt_rr) {
+ return kr_error(ENOMEM);
+ }
+ knot_edns_init(ctx->downstream_opt_rr, KR_EDNS_PAYLOAD, 0, KR_EDNS_VERSION, engine->pool);
+ knot_edns_init(ctx->upstream_opt_rr, KR_EDNS_PAYLOAD, 0, KR_EDNS_VERSION, engine->pool);
+ /* Use default TLS padding */
+ ctx->tls_padding = -1;
+ /* Empty init; filled via ./lua/postconfig.lua */
+ kr_zonecut_init(&ctx->root_hints, (const uint8_t *)"", engine->pool);
+ lru_create(&ctx->cache_cookie, LRU_COOKIES_SIZE, NULL, NULL);
+
+ /* Load basic modules */
+ engine_register(engine, "iterate", NULL, NULL);
+ engine_register(engine, "validate", NULL, NULL);
+ engine_register(engine, "cache", NULL, NULL);
+
+ return array_push(engine->backends, kr_cdb_lmdb());
+}
+
+static int init_state(struct engine *engine)
+{
+ /* Initialize Lua state */
+ engine->L = luaL_newstate();
+ if (engine->L == NULL) {
+ return kr_error(ENOMEM);
+ }
+ /* Initialize used libraries. */
+ luaL_openlibs(engine->L);
+ /* Global functions */
+ lua_pushcfunction(engine->L, l_help);
+ lua_setglobal(engine->L, "help");
+ lua_pushcfunction(engine->L, l_quit);
+ lua_setglobal(engine->L, "quit");
+ lua_pushcfunction(engine->L, l_hostname);
+ lua_setglobal(engine->L, "hostname");
+ lua_pushcfunction(engine->L, l_package_version);
+ lua_setglobal(engine->L, "package_version");
+ lua_pushcfunction(engine->L, l_verbose);
+ lua_setglobal(engine->L, "verbose");
+ lua_pushcfunction(engine->L, l_setuser);
+ lua_setglobal(engine->L, "user");
+ lua_pushcfunction(engine->L, l_hint_root_file);
+ lua_setglobal(engine->L, "_hint_root_file");
+ lua_pushliteral(engine->L, libknot_SONAME);
+ lua_setglobal(engine->L, "libknot_SONAME");
+ lua_pushliteral(engine->L, libzscanner_SONAME);
+ lua_setglobal(engine->L, "libzscanner_SONAME");
+ lua_pushcfunction(engine->L, l_tojson);
+ lua_setglobal(engine->L, "tojson");
+ lua_pushcfunction(engine->L, l_fromjson);
+ lua_setglobal(engine->L, "fromjson");
+ /* Random number generator */
+ lua_getfield(engine->L, LUA_GLOBALSINDEX, "math");
+ lua_getfield(engine->L, -1, "randomseed");
+ lua_remove(engine->L, -2);
+ lua_Number seed = kr_rand_bytes(sizeof(lua_Number));
+ lua_pushnumber(engine->L, seed);
+ lua_call(engine->L, 1, 0);
+ return kr_ok();
+}
+
+/**
+ * Start luacov measurement and store results to file specified by
+ * KRESD_COVERAGE_STATS environment variable.
+ * Do nothing if the variable is not set.
+ */
+static void init_measurement(struct engine *engine)
+{
+ const char * const statspath = getenv("KRESD_COVERAGE_STATS");
+ if (!statspath)
+ return;
+
+ char * snippet = NULL;
+ int ret = asprintf(&snippet,
+ "_luacov_runner = require('luacov.runner')\n"
+ "_luacov_runner.init({\n"
+ " statsfile = '%s',\n"
+ " exclude = {'test', 'tapered', 'lua/5.1'},\n"
+ "})\n"
+ "jit.off()\n", statspath
+ );
+ assert(ret > 0); (void)ret;
+
+ ret = luaL_loadstring(engine->L, snippet);
+ assert(ret == 0);
+ lua_call(engine->L, 0, 0);
+ free(snippet);
+}
+
+int init_lua(struct engine *engine) {
+ if (!engine) {
+ return kr_error(EINVAL);
+ }
+
+ /* Use libdir path for including Lua scripts */
+ char l_paths[MAXPATHLEN] = { 0 };
+ #pragma GCC diagnostic push
+ #pragma GCC diagnostic ignored "-Wformat" /* %1$ is not in C standard */
+ /* Save original package.path to package._path */
+ snprintf(l_paths, MAXPATHLEN - 1,
+ "if package._path == nil then package._path = package.path end\n"
+ "package.path = '%1$s/?.lua;%1$s/?/init.lua;'..package._path\n"
+ "if package._cpath == nil then package._cpath = package.cpath end\n"
+ "package.cpath = '%1$s/?%2$s;'..package._cpath\n",
+ LIBDIR, LIBEXT);
+ #pragma GCC diagnostic pop
+
+ int ret = l_dobytecode(engine->L, l_paths, strlen(l_paths), "");
+ if (ret != 0) {
+ lua_pop(engine->L, 1);
+ return ret;
+ }
+ return 0;
+}
+
+
+int engine_init(struct engine *engine, knot_mm_t *pool)
+{
+ if (engine == NULL) {
+ return kr_error(EINVAL);
+ }
+
+ memset(engine, 0, sizeof(*engine));
+ engine->pool = pool;
+
+ /* Initialize state */
+ int ret = init_state(engine);
+ if (ret != 0) {
+ engine_deinit(engine);
+ return ret;
+ }
+ init_measurement(engine);
+ /* Initialize resolver */
+ ret = init_resolver(engine);
+ if (ret != 0) {
+ engine_deinit(engine);
+ return ret;
+ }
+ /* Initialize network */
+ network_init(&engine->net, uv_default_loop(), TCP_BACKLOG_DEFAULT);
+
+ /* Initialize lua */
+ ret = init_lua(engine);
+ if (ret != 0) {
+ engine_deinit(engine);
+ return ret;
+ }
+
+ return ret;
+}
+
+/** Unregister a (found) module */
+static void engine_unload(struct engine *engine, struct kr_module *module)
+{
+ auto_free char *name = module->name ? strdup(module->name) : NULL;
+ kr_module_unload(module); /* beware: lua/C mix, could be confusing */
+ /* Clear in Lua world, but not for embedded modules ('cache' in particular). */
+ if (name && !kr_module_get_embedded(name)) {
+ lua_pushnil(engine->L);
+ lua_setglobal(engine->L, name);
+ }
+ free(module);
+}
+
+void engine_deinit(struct engine *engine)
+{
+ if (engine == NULL) {
+ return;
+ }
+ if (!engine->L) {
+ assert(false);
+ return;
+ }
+ /* Only close sockets and services; no need to clean up mempool. */
+
+ /* Network deinit is split up. We first need to stop listening,
+ * then we can unload modules during which we still want
+ * e.g. the endpoint kind registry to work (inside ->net),
+ * and this registry deinitization uses the lua state. */
+ network_close_force(&engine->net);
+ for (size_t i = 0; i < engine->modules.len; ++i) {
+ engine_unload(engine, engine->modules.at[i]);
+ }
+ kr_zonecut_deinit(&engine->resolver.root_hints);
+ kr_cache_close(&engine->resolver.cache);
+
+ /* The LRUs are currently malloc-ated and need to be freed. */
+ lru_free(engine->resolver.cache_cookie);
+
+ network_deinit(&engine->net);
+ ffimodule_deinit(engine->L);
+ lua_close(engine->L);
+
+ /* Free data structures */
+ array_clear(engine->modules);
+ array_clear(engine->backends);
+ kr_ta_clear(&engine->resolver.trust_anchors);
+ kr_ta_clear(&engine->resolver.negative_anchors);
+ free(engine->hostname);
+}
+
+int engine_pcall(lua_State *L, int argc)
+{
+ return lua_pcall(L, argc, LUA_MULTRET, 0);
+}
+
+int engine_cmd(lua_State *L, const char *str, bool raw)
+{
+ if (L == NULL) {
+ return kr_error(ENOEXEC);
+ }
+
+ /* Evaluate results */
+ lua_getglobal(L, "eval_cmd");
+ lua_pushstring(L, str);
+ lua_pushboolean(L, raw);
+
+ /* Check result. */
+ return engine_pcall(L, 2);
+}
+
+int engine_load_sandbox(struct engine *engine)
+{
+ /* Init environment */
+ int ret = luaL_dofile(engine->L, LIBDIR "/sandbox.lua");
+ if (ret != 0) {
+ fprintf(stderr, "[system] error %s\n", lua_tostring(engine->L, -1));
+ lua_pop(engine->L, 1);
+ return kr_error(ENOEXEC);
+ }
+ ret = ffimodule_init(engine->L);
+ return ret;
+}
+
+int engine_loadconf(struct engine *engine, const char *config_path)
+{
+ assert(config_path != NULL);
+
+ char cwd[PATH_MAX];
+ get_workdir(cwd, sizeof(cwd));
+ kr_log_verbose("[system] loading config '%s' (workdir '%s')\n", config_path, cwd);
+
+ int ret = luaL_dofile(engine->L, config_path);
+ if (ret != 0) {
+ fprintf(stderr, "[system] error while loading config: "
+ "%s (workdir '%s')\n", lua_tostring(engine->L, -1), cwd);
+ lua_pop(engine->L, 1);
+ }
+ return ret;
+}
+
+int engine_start(struct engine *engine)
+{
+ /* Clean up stack */
+ lua_settop(engine->L, 0);
+
+ return kr_ok();
+}
+
+void engine_stop(struct engine *engine)
+{
+ if (!engine) {
+ return;
+ }
+ uv_stop(uv_default_loop());
+}
+
+/** @internal Find matching module */
+static size_t module_find(module_array_t *mod_list, const char *name)
+{
+ size_t found = mod_list->len;
+ for (size_t i = 0; i < mod_list->len; ++i) {
+ struct kr_module *mod = mod_list->at[i];
+ if (strcmp(mod->name, name) == 0) {
+ found = i;
+ break;
+ }
+ }
+ return found;
+}
+
+int engine_register(struct engine *engine, const char *name, const char *precedence, const char* ref)
+{
+ if (engine == NULL || name == NULL) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+ /* Make sure module is unloaded */
+ (void) engine_unregister(engine, name);
+ /* Find the index of referenced module. */
+ module_array_t *mod_list = &engine->modules;
+ size_t ref_pos = mod_list->len;
+ if (precedence && ref) {
+ ref_pos = module_find(mod_list, ref);
+ if (ref_pos >= mod_list->len) {
+ return kr_error(EIDRM);
+ }
+ }
+ /* Attempt to load binary module */
+ struct kr_module *module = malloc(sizeof(*module));
+ if (!module) {
+ return kr_error(ENOMEM);
+ }
+ module->data = engine; /*< some outside modules may still use this value */
+
+ int ret = kr_module_load(module, name, LIBDIR "/kres_modules");
+ if (ret == 0) {
+ /* We have a C module, loaded and init() was called.
+ * Now we need to prepare the lua side. */
+ lua_State *L = engine->L;
+ lua_getglobal(L, "modules_create_table_for_c");
+ lua_pushpointer(L, module);
+ if (lua_isnil(L, -2)) {
+ /* When loading the three embedded modules, we don't
+ * have the "modules_*" lua function yet, but fortunately
+ * we don't need it there. Let's just check they're embedded.
+ * TODO: solve this better *without* breaking stuff. */
+ lua_pop(L, 2);
+ if (module->lib != RTLD_DEFAULT) {
+ ret = kr_error(1);
+ lua_pushliteral(L, "missing modules_create_table_for_c()");
+ }
+ } else {
+ ret = engine_pcall(L, 1);
+ }
+ if (ret) {
+ kr_log_error("[system] internal error when loading C module %s: %s\n",
+ module->name, lua_tostring(L, -1));
+ lua_pop(L, 1);
+ assert(false); /* probably not critical, but weird */
+ }
+
+ } else if (ret == kr_error(ENOENT)) {
+ /* No luck with C module, so try to load and .init() lua module. */
+ ret = ffimodule_register_lua(engine, module, name);
+ if (ret != 0) {
+ kr_log_error("[system] failed to load module '%s'\n", name);
+ }
+
+ } else if (ret == kr_error(ENOTSUP)) {
+ /* Print a more helpful message when module is linked against an old resolver ABI. */
+ kr_log_error("[system] module '%s' links to unsupported ABI, please rebuild it\n", name);
+ }
+
+ if (ret != 0) {
+ engine_unload(engine, module);
+ return ret;
+ }
+
+ /* Push to the right place in engine->modules */
+ if (array_push(engine->modules, module) < 0) {
+ engine_unload(engine, module);
+ return kr_error(ENOMEM);
+ }
+ if (precedence) {
+ struct kr_module **arr = mod_list->at;
+ size_t emplacement = mod_list->len;
+ if (strcasecmp(precedence, ">") == 0) {
+ if (ref_pos + 1 < mod_list->len)
+ emplacement = ref_pos + 1; /* Insert after target */
+ }
+ if (strcasecmp(precedence, "<") == 0) {
+ emplacement = ref_pos; /* Insert at target */
+ }
+ /* Move the tail if it has some elements. */
+ if (emplacement + 1 < mod_list->len) {
+ memmove(&arr[emplacement + 1], &arr[emplacement], sizeof(*arr) * (mod_list->len - (emplacement + 1)));
+ arr[emplacement] = module;
+ }
+ }
+
+ return kr_ok();
+}
+
+int engine_unregister(struct engine *engine, const char *name)
+{
+ module_array_t *mod_list = &engine->modules;
+ size_t found = module_find(mod_list, name);
+ if (found < mod_list->len) {
+ engine_unload(engine, mod_list->at[found]);
+ array_del(*mod_list, found);
+ return kr_ok();
+ }
+
+ return kr_error(ENOENT);
+}
+
diff --git a/daemon/engine.h b/daemon/engine.h
new file mode 100644
index 0000000..d724f92
--- /dev/null
+++ b/daemon/engine.h
@@ -0,0 +1,84 @@
+/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+/*
+ * @internal These are forward decls to allow building modules with engine but without Lua.
+ */
+struct lua_State;
+
+#include "lib/utils.h"
+#include "lib/resolve.h"
+#include "daemon/network.h"
+
+struct engine {
+ struct kr_context resolver;
+ struct network net;
+ module_array_t modules;
+ array_t(const struct kr_cdb_api *) backends;
+ knot_mm_t *pool;
+ char *hostname;
+ struct lua_State *L;
+};
+
+int engine_init(struct engine *engine, knot_mm_t *pool);
+void engine_deinit(struct engine *engine);
+
+/** Perform a lua command within the sandbox.
+ *
+ * @return zero on success.
+ * The result will be returned on the lua stack - an error message in case of failure.
+ * http://www.lua.org/manual/5.1/manual.html#lua_pcall */
+int engine_cmd(struct lua_State *L, const char *str, bool raw);
+
+/** Execute current chunk in the sandbox */
+int engine_pcall(struct lua_State *L, int argc);
+
+int engine_load_sandbox(struct engine *engine);
+int engine_loadconf(struct engine *engine, const char *config_path);
+
+/** Start the lua engine and execute the config. */
+int engine_start(struct engine *engine);
+void engine_stop(struct engine *engine);
+int engine_register(struct engine *engine, const char *name, const char *precedence, const char* ref);
+int engine_unregister(struct engine *engine, const char *name);
+
+/** Set/get the per engine hostname */
+char *engine_get_hostname(struct engine *engine);
+int engine_set_hostname(struct engine *engine, const char *hostname);
+
+/** Load root hints from a zonefile (or config-time default if NULL).
+ *
+ * @return error message or NULL (statically allocated)
+ * @note exported to be usable from the hints module.
+ */
+KR_EXPORT
+const char* engine_hint_root_file(struct kr_context *ctx, const char *file);
+
+/* @internal Array of ip address shorthand. */
+typedef array_t(char*) addr_array_t;
+
+typedef array_t(const char*) config_array_t;
+
+typedef struct {
+ int fd;
+ endpoint_flags_t flags; /**< .sock_type isn't meaningful here */
+} flagged_fd_t;
+typedef array_t(flagged_fd_t) flagged_fd_array_t;
+
+struct args {
+ addr_array_t addrs, addrs_tls;
+ flagged_fd_array_t fds;
+ int control_fd;
+ int forks;
+ config_array_t config;
+ const char *rundir;
+ bool interactive;
+ bool quiet;
+ bool tty_binary_output;
+};
+
+/** Pointer to kresd arguments. */
+KR_EXPORT extern struct args *the_args;
diff --git a/daemon/ffimodule.c b/daemon/ffimodule.c
new file mode 100644
index 0000000..44809f9
--- /dev/null
+++ b/daemon/ffimodule.c
@@ -0,0 +1,305 @@
+/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <uv.h>
+#include <lua.h>
+#include <lauxlib.h>
+
+#include "daemon/bindings/impl.h"
+#include "daemon/engine.h"
+#include "daemon/ffimodule.h"
+#include "daemon/worker.h"
+#include "lib/module.h"
+#include "lib/layer.h"
+
+/** @internal Slots for layer callbacks.
+ * Each slot ID corresponds to Lua reference in module API. */
+enum {
+ SLOT_begin = 0,
+ SLOT_reset,
+ SLOT_finish,
+ SLOT_consume,
+ SLOT_produce,
+ SLOT_checkout,
+ SLOT_answer_finalize,
+ SLOT_count /* dummy, must be the last */
+};
+
+/** Lua registry indices for functions that wrap layer callbacks (shared by all lua modules). */
+static int l_ffi_wrap_slots[SLOT_count] = { 0 };
+
+/** @internal Continue with coroutine. */
+static void l_ffi_resume_cb(uv_idle_t *check)
+{
+ lua_State *L = check->data;
+ int status = lua_resume(L, 0);
+ if (status != LUA_YIELD) {
+ uv_idle_stop(check); /* Stop coroutine */
+ uv_close((uv_handle_t *)check, (uv_close_cb)free);
+ }
+ lua_pop(L, lua_gettop(L));
+}
+
+/** @internal Schedule deferred continuation. */
+static int l_ffi_defer(lua_State *L)
+{
+ uv_idle_t *check = malloc(sizeof(*check));
+ if (!check) {
+ return kr_error(ENOMEM);
+ }
+ uv_idle_init(uv_default_loop(), check);
+ check->data = L;
+ return uv_idle_start(check, l_ffi_resume_cb);
+}
+
+/** Common part of calling modname.(de)init in lua.
+ * The function to call should be on top of the stack and it gets popped. */
+static int l_ffi_modcb(lua_State *L, struct kr_module *module)
+{
+ if (lua_isnil(L, -1)) {
+ lua_pop(L, 1); /* .(de)init == nil, maybe even the module table doesn't exist */
+ return kr_ok();
+ }
+ lua_getglobal(L, "modules_ffi_wrap_modcb");
+ lua_insert(L, -2); /* swap with .(de)init */
+ lua_pushpointer(L, module);
+ if (lua_pcall(L, 2, 0, 0) == 0)
+ return kr_ok();
+ kr_log_error("error: %s\n", lua_tostring(L, -1));
+ lua_pop(L, 1);
+ return kr_error(1);
+}
+
+static int l_ffi_deinit(struct kr_module *module)
+{
+ /* Call .deinit(), if it exists. */
+ lua_State *L = the_worker->engine->L;
+ lua_getglobal(L, module->name);
+ lua_getfield(L, -1, "deinit");
+ const int ret = l_ffi_modcb(L, module);
+ lua_pop(L, 1); /* the module's table */
+
+ const kr_layer_api_t *api = module->layer;
+ if (!api) {
+ return ret;
+ }
+ /* Unregister layer callback references from registry. */
+ for (int si = 0; si < SLOT_count; ++si) {
+ if (api->cb_slots[si] > 0) {
+ luaL_unref(L, LUA_REGISTRYINDEX, api->cb_slots[si]);
+ }
+ }
+ free_const(api);
+ return ret;
+}
+
+kr_layer_t kr_layer_t_static;
+
+/** @internal Helper for calling a layer Lua function by e.g. SLOT_begin. */
+static int l_ffi_call_layer(kr_layer_t *ctx, int slot_ix)
+{
+ const int wrap_slot = l_ffi_wrap_slots[slot_ix];
+ const int cb_slot = ctx->api->cb_slots[slot_ix];
+ assert(wrap_slot > 0 && cb_slot > 0);
+ lua_State *L = the_worker->engine->L;
+ lua_rawgeti(L, LUA_REGISTRYINDEX, wrap_slot);
+ lua_rawgeti(L, LUA_REGISTRYINDEX, cb_slot);
+ /* We pass the content of *ctx via a global structure to avoid
+ * lua (full) userdata, as that's relatively expensive (GC-allocated).
+ * Performance: copying isn't ideal, but it's not visible in profiles. */
+ memcpy(&kr_layer_t_static, ctx, sizeof(*ctx));
+
+ int ret = lua_pcall(L, 1, 1, 0);
+ /* Handle result of the pcall.
+ * Default state: ctx->req->state seems safer than ctx->state,
+ * in case the pcall touched req->state. */
+ int state = ctx->req->state;
+ if (ret) { /* Exception or another lua problem. */
+ state = KR_STATE_FAIL;
+ kr_log_error("error: %s\n", lua_tostring(L, -1));
+
+ } else if (lua_isnumber(L, -1)) { /* Explicitly returned state. */
+ state = lua_tointeger(L, -1);
+ if (!kr_state_consistent(state)) {
+ kr_log_error("error: nonsense state returned from lua module layer: %d\n",
+ state);
+ state = KR_STATE_FAIL;
+ }
+
+ } else if (lua_isnil(L, -1)) { /* Don't change state. */
+
+ } else if (lua_isthread(L, -1)) { /* Continuations */
+ /* TODO: unused, possibly in a bad shape. Meant KR_STATE_YIELD? */
+ assert(!ENOTSUP);
+ if (l_ffi_defer(lua_tothread(L, -1)) != 0)
+ state = KR_STATE_FAIL;
+
+ } else { /* Nonsense returned. */
+ state = KR_STATE_FAIL;
+ kr_log_error("error: nonsense returned from lua module layer: %s\n",
+ lua_tostring(L, -1));
+ /* Unfortunately we can't easily get name of the module/function here. */
+ }
+ lua_pop(L, 1);
+ return state;
+}
+
+static int l_ffi_layer_begin(kr_layer_t *ctx)
+{
+ return l_ffi_call_layer(ctx, SLOT_begin);
+}
+
+static int l_ffi_layer_reset(kr_layer_t *ctx)
+{
+ return l_ffi_call_layer(ctx, SLOT_reset);
+}
+
+static int l_ffi_layer_finish(kr_layer_t *ctx)
+{
+ ctx->pkt = ctx->req->answer;
+ return l_ffi_call_layer(ctx, SLOT_finish);
+}
+
+static int l_ffi_layer_consume(kr_layer_t *ctx, knot_pkt_t *pkt)
+{
+ if (ctx->state & KR_STATE_FAIL) {
+ return ctx->state; /* Already failed, skip */
+ }
+ ctx->pkt = pkt;
+ return l_ffi_call_layer(ctx, SLOT_consume);
+}
+
+static int l_ffi_layer_produce(kr_layer_t *ctx, knot_pkt_t *pkt)
+{
+ if (ctx->state & KR_STATE_FAIL) {
+ return ctx->state; /* Already failed, skip */
+ }
+ ctx->pkt = pkt;
+ return l_ffi_call_layer(ctx, SLOT_produce);
+}
+
+static int l_ffi_layer_checkout(kr_layer_t *ctx, knot_pkt_t *pkt,
+ struct sockaddr *dst, int type)
+{
+ if (ctx->state & KR_STATE_FAIL) {
+ return ctx->state; /* Already failed, skip */
+ }
+ ctx->pkt = pkt;
+ ctx->dst = dst;
+ ctx->is_stream = (type == SOCK_STREAM);
+ return l_ffi_call_layer(ctx, SLOT_checkout);
+}
+
+static int l_ffi_layer_answer_finalize(kr_layer_t *ctx)
+{
+ return l_ffi_call_layer(ctx, SLOT_answer_finalize);
+}
+
+int ffimodule_init(lua_State *L)
+{
+ /* Wrappers defined in ./lua/sandbox.lua */
+ /* for API: (int state, kr_request_t *req) */
+ lua_getglobal(L, "modules_ffi_layer_wrap1");
+ const int wrap1 = luaL_ref(L, LUA_REGISTRYINDEX);
+ /* for API: (int state, kr_request_t *req, knot_pkt_t *) */
+ lua_getglobal(L, "modules_ffi_layer_wrap2");
+ const int wrap2 = luaL_ref(L, LUA_REGISTRYINDEX);
+ lua_getglobal(L, "modules_ffi_layer_wrap_checkout");
+ const int wrap_checkout = luaL_ref(L, LUA_REGISTRYINDEX);
+ if (wrap1 == LUA_REFNIL || wrap2 == LUA_REFNIL || wrap_checkout == LUA_REFNIL) {
+ return kr_error(ENOENT);
+ }
+
+ const int slots[SLOT_count] = {
+ [SLOT_begin] = wrap1,
+ [SLOT_reset] = wrap1,
+ [SLOT_finish] = wrap2,
+ [SLOT_consume] = wrap2,
+ [SLOT_produce] = wrap2,
+ [SLOT_checkout] = wrap_checkout,
+ [SLOT_answer_finalize] = wrap1,
+ };
+ memcpy(l_ffi_wrap_slots, slots, sizeof(l_ffi_wrap_slots));
+ return kr_ok();
+}
+void ffimodule_deinit(lua_State *L)
+{
+ /* Unref each wrapper function from lua.
+ * It's probably useless, as we're about to destroy lua_State, but... */
+ const int wrapsIndices[] = {
+ SLOT_begin,
+ SLOT_consume,
+ SLOT_checkout,
+ };
+ for (int i = 0; i < sizeof(wrapsIndices) / sizeof(wrapsIndices[0]); ++i) {
+ luaL_unref(L, LUA_REGISTRYINDEX, l_ffi_wrap_slots[wrapsIndices[i]]);
+ }
+}
+
+/** @internal Conditionally register layer trampoline
+ * @warning Expects 'module.layer' to be on top of Lua stack. */
+#define LAYER_REGISTER(L, api, name) do { \
+ int *cb_slot = (api)->cb_slots + SLOT_ ## name; \
+ lua_getfield((L), -1, #name); \
+ if (!lua_isnil((L), -1)) { \
+ (api)->name = l_ffi_layer_ ## name; \
+ *cb_slot = luaL_ref((L), LUA_REGISTRYINDEX); \
+ } else { \
+ lua_pop((L), 1); \
+ } \
+} while(0)
+
+/** @internal Create C layer api wrapper. */
+static kr_layer_api_t *l_ffi_layer_create(lua_State *L, struct kr_module *module)
+{
+ /* Fabricate layer API wrapping the Lua functions
+ * reserve slots after it for references to Lua callbacks. */
+ const size_t api_length = offsetof(kr_layer_api_t, cb_slots)
+ + (SLOT_count * sizeof(module->layer->cb_slots[0]));
+ kr_layer_api_t *api = calloc(1, api_length);
+ if (api) {
+ LAYER_REGISTER(L, api, begin);
+ LAYER_REGISTER(L, api, finish);
+ LAYER_REGISTER(L, api, consume);
+ LAYER_REGISTER(L, api, produce);
+ LAYER_REGISTER(L, api, checkout);
+ LAYER_REGISTER(L, api, answer_finalize);
+ LAYER_REGISTER(L, api, reset);
+ }
+ return api;
+}
+
+#undef LAYER_REGISTER
+
+int ffimodule_register_lua(struct engine *engine, struct kr_module *module, const char *name)
+{
+ /* Register module in Lua */
+ lua_State *L = engine->L;
+ lua_getglobal(L, "require");
+ lua_pushfstring(L, "kres_modules.%s", name);
+ if (lua_pcall(L, 1, LUA_MULTRET, 0) != 0) {
+ kr_log_error("error: %s\n", lua_tostring(L, -1));
+ lua_pop(L, 1);
+ return kr_error(ENOENT);
+ }
+ lua_setglobal(L, name);
+ lua_getglobal(L, name);
+
+ /* Create FFI module with trampolined functions. */
+ memset(module, 0, sizeof(*module));
+ module->name = strdup(name);
+ module->deinit = &l_ffi_deinit;
+ /* Bake layer API if defined in module */
+ lua_getfield(L, -1, "layer");
+ if (!lua_isnil(L, -1)) {
+ module->layer = l_ffi_layer_create(L, module);
+ }
+ lua_pop(L, 1); /* .layer table */
+
+ /* Now call .init(), if it exists. */
+ lua_getfield(L, -1, "init");
+ const int ret = l_ffi_modcb(L, module);
+ lua_pop(L, 1); /* the module's table */
+ return ret;
+}
diff --git a/daemon/ffimodule.h b/daemon/ffimodule.h
new file mode 100644
index 0000000..f86c764
--- /dev/null
+++ b/daemon/ffimodule.h
@@ -0,0 +1,36 @@
+/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "lib/defines.h"
+#include "lib/layer.h"
+#include <lua.h>
+struct engine;
+struct kr_module;
+
+/**
+ * Register Lua module as a FFI module.
+ * This fabricates a standard module interface,
+ * that trampolines to the Lua module methods.
+ *
+ * @note Lua module is loaded in it's own coroutine,
+ * so it's possible to yield and resume at arbitrary
+ * places except deinit()
+ *
+ * @param engine daemon engine
+ * @param module prepared module
+ * @param name module name
+ * @return 0 or an error
+ */
+int ffimodule_register_lua(struct engine *engine, struct kr_module *module, const char *name);
+
+int ffimodule_init(lua_State *L);
+void ffimodule_deinit(lua_State *L);
+
+/** Static storage for faster passing of layer function parameters to lua callbacks.
+ *
+ * We don't need to declare it in a header, but let's give it visibility. */
+KR_EXPORT extern kr_layer_t kr_layer_t_static;
+
diff --git a/daemon/http.c b/daemon/http.c
new file mode 100644
index 0000000..f72465f
--- /dev/null
+++ b/daemon/http.c
@@ -0,0 +1,669 @@
+/*
+ * Copyright (C) 2020 CZ.NIC, z.s.p.o
+ *
+ * Initial Author: Jan Hák <jan.hak@nic.cz>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "daemon/io.h"
+#include "daemon/http.h"
+#include "daemon/worker.h"
+#include "daemon/session.h"
+#include "lib/layer/iterate.h" /* kr_response_classify */
+#include "lib/cache/util.h"
+
+#include "contrib/cleanup.h"
+#include "contrib/base64url.h"
+
+#define MAKE_NV(K, KS, V, VS) \
+ { (uint8_t *)(K), (uint8_t *)(V), (KS), (VS), NGHTTP2_NV_FLAG_NONE }
+
+#define MAKE_STATIC_NV(K, V) \
+ MAKE_NV((K), sizeof(K) - 1, (V), sizeof(V) - 1)
+
+/* Use same maximum as for tcp_pipeline_max. */
+#define HTTP_MAX_CONCURRENT_STREAMS UINT16_MAX
+
+#define HTTP_FRAME_HDLEN 9
+#define HTTP_FRAME_PADLEN 1
+
+#define MAX_DECIMAL_LENGTH(VT) ((CHAR_BIT * sizeof(VT) / 3) + 3)
+
+struct http_data {
+ uint8_t *buf;
+ size_t len;
+ size_t pos;
+ uint32_t ttl;
+ uv_write_cb on_write;
+ uv_write_t *req;
+};
+
+/*
+ * Write HTTP/2 protocol data to underlying transport layer.
+ */
+static ssize_t send_callback(nghttp2_session *h2, const uint8_t *data, size_t length,
+ int flags, void *user_data)
+{
+ struct http_ctx *ctx = (struct http_ctx *)user_data;
+ return ctx->send_cb(data, length, ctx->session);
+}
+
+/*
+ * Send padding length (if greater than zero).
+ */
+static int send_padlen(struct http_ctx *ctx, size_t padlen)
+{
+ int ret;
+ uint8_t buf;
+
+ if (padlen == 0)
+ return 0;
+
+ buf = (uint8_t)padlen;
+ ret = ctx->send_cb(&buf, HTTP_FRAME_PADLEN, ctx->session);
+ if (ret < 0)
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+
+ return 0;
+}
+
+/*
+ * Send HTTP/2 zero-byte padding.
+ *
+ * This sends only padlen-1 bytes of padding (if any), since padlen itself
+ * (already sent) is also considered padding. Refer to RFC7540, section 6.1
+ */
+static int send_padding(struct http_ctx *ctx, uint8_t padlen)
+{
+ static const uint8_t buf[UINT8_MAX];
+ int ret;
+
+ if (padlen <= 1)
+ return 0;
+
+ ret = ctx->send_cb(buf, padlen - 1, ctx->session);
+ if (ret < 0)
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+
+ return 0;
+}
+
+/*
+ * Write entire DATA frame to underlying transport layer.
+ *
+ * This function reads directly from data provider to avoid copying packet wire buffer.
+ */
+static int send_data_callback(nghttp2_session *h2, nghttp2_frame *frame, const uint8_t *framehd,
+ size_t length, nghttp2_data_source *source, void *user_data)
+{
+ struct http_data *data;
+ int ret;
+ struct http_ctx *ctx;
+
+ ctx = (struct http_ctx *)user_data;
+ data = (struct http_data*)source->ptr;
+
+ ret = ctx->send_cb(framehd, HTTP_FRAME_HDLEN, ctx->session);
+ if (ret < 0)
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+
+ ret = send_padlen(ctx, frame->data.padlen);
+ if (ret < 0)
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+
+ ret = ctx->send_cb(data->buf + data->pos, length, ctx->session);
+ if (ret < 0)
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+ data->pos += length;
+ assert(data->pos <= data->len);
+
+ ret = send_padding(ctx, (uint8_t)frame->data.padlen);
+ if (ret < 0)
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+
+ return 0;
+}
+
+/*
+ * Check endpoint and uri path
+ */
+static int check_uri(const char* uri_path)
+{
+ static const char key[] = "dns=";
+ static const char *delim = "&";
+ static const char *endpoins[] = {"dns-query", "doh"};
+ char *beg;
+ char *end_prev;
+ ssize_t endpoint_len;
+ ssize_t ret;
+
+ if (!uri_path)
+ return kr_error(EINVAL);
+
+ auto_free char *path = malloc(sizeof(*path) * (strlen(uri_path) + 1));
+ if (!path)
+ return kr_error(ENOMEM);
+
+ memcpy(path, uri_path, strlen(uri_path));
+ path[strlen(uri_path)] = '\0';
+
+ char *query_mark = strstr(path, "?");
+
+ /* calculating of endpoint_len - for POST or GET method */
+ endpoint_len = (query_mark) ? query_mark - path - 1 : strlen(path) - 1;
+
+ /* check endpoint */
+ ret = -1;
+ for(int i = 0; i < sizeof(endpoins)/sizeof(*endpoins); i++)
+ {
+ if (strlen(endpoins[i]) != endpoint_len)
+ continue;
+ ret = strncmp(path + 1, endpoins[i], strlen(endpoins[i]));
+ if (!ret)
+ break;
+ }
+
+ if (ret) /* no endpoint found */
+ return -1;
+ if (endpoint_len == strlen(path) - 1) /* done for POST method */
+ return 0;
+
+ /* go over key:value pair */
+ beg = strtok(query_mark + 1, delim);
+ if (beg) {
+ while (beg != NULL) {
+ if (!strncmp(beg, key, 4)) { /* dns variable in path found */
+ break;
+ }
+ end_prev = beg + strlen(beg);
+ beg = strtok(NULL, delim);
+ if (beg-1 != end_prev) { /* detect && */
+ return -1;
+ }
+ }
+
+ if (!beg) { /* no dns variable in path */
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Process a query from URI path if there's base64url encoded dns variable.
+ */
+static int process_uri_path(struct http_ctx *ctx, const char* path, int32_t stream_id)
+{
+ if (!ctx || !path)
+ return kr_error(EINVAL);
+
+ static const char key[] = "dns=";
+ char *beg = strstr(path, key);
+ char *end;
+ size_t remaining;
+ ssize_t ret;
+ uint8_t *dest;
+
+ if (!beg) /* No dns variable in path. */
+ return 0;
+
+ beg += sizeof(key) - 1;
+ end = strchr(beg, '&');
+ if (end == NULL)
+ end = beg + strlen(beg);
+
+ ctx->buf_pos = sizeof(uint16_t); /* Reserve 2B for dnsmsg len. */
+ remaining = ctx->buf_size - ctx->submitted - ctx->buf_pos;
+ dest = ctx->buf + ctx->buf_pos;
+
+ ret = kr_base64url_decode((uint8_t*)beg, end - beg, dest, remaining);
+ if (ret < 0) {
+ ctx->buf_pos = 0;
+ kr_log_verbose("[http] base64url decode failed %s\n",
+ strerror(ret));
+ return ret;
+ }
+
+ ctx->buf_pos += ret;
+ queue_push(ctx->streams, stream_id);
+ return 0;
+}
+
+static void refuse_stream(nghttp2_session *h2, int32_t stream_id)
+{
+ nghttp2_submit_rst_stream(
+ h2, NGHTTP2_FLAG_NONE, stream_id, NGHTTP2_REFUSED_STREAM);
+}
+
+/*
+ * Save stream id from first header's frame.
+ *
+ * We don't support interweaving from different streams. To successfully parse
+ * multiple subsequent streams, each one must be fully received before processing
+ * a new stream.
+ */
+static int begin_headers_callback(nghttp2_session *h2, const nghttp2_frame *frame,
+ void *user_data)
+{
+ struct http_ctx *ctx = (struct http_ctx *)user_data;
+ int32_t stream_id = frame->hd.stream_id;
+
+ if (frame->hd.type != NGHTTP2_HEADERS ||
+ frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
+ return 0;
+ }
+
+ if (ctx->incomplete_stream != -1) {
+ kr_log_verbose(
+ "[http] stream %d incomplete, refusing\n", ctx->incomplete_stream);
+ refuse_stream(h2, stream_id);
+ } else {
+ ctx->incomplete_stream = stream_id;
+ }
+ return 0;
+}
+
+/*
+ * Process a received header name-value pair.
+ *
+ * In DoH, GET requests contain the base64url-encoded query in dns variable present in path.
+ * This variable is parsed from :path pseudoheader.
+ */
+static int header_callback(nghttp2_session *h2, const nghttp2_frame *frame,
+ const uint8_t *name, size_t namelen, const uint8_t *value,
+ size_t valuelen, uint8_t flags, void *user_data)
+{
+ struct http_ctx *ctx = (struct http_ctx *)user_data;
+ int32_t stream_id = frame->hd.stream_id;
+
+ if (frame->hd.type != NGHTTP2_HEADERS)
+ return 0;
+
+ if (ctx->incomplete_stream != stream_id) {
+ kr_log_verbose(
+ "[http] stream %d incomplete, refusing\n", ctx->incomplete_stream);
+ refuse_stream(h2, stream_id);
+ return 0;
+ }
+
+ if (!strcasecmp(":path", (const char *)name)) {
+ if (check_uri((const char *)value) < 0) {
+ refuse_stream(h2, stream_id);
+ return 0;
+ }
+
+ ctx->uri_path = malloc(sizeof(*ctx->uri_path) * (valuelen + 1));
+ if (!ctx->uri_path)
+ return kr_error(ENOMEM);
+ memcpy(ctx->uri_path, value, valuelen);
+ ctx->uri_path[valuelen] = '\0';
+ }
+
+ if (!strcasecmp(":method", (const char *)name)) {
+ if (!strcasecmp("get", (const char *)value)) {
+ ctx->current_method = HTTP_METHOD_GET;
+ } else if (!strcasecmp("post", (const char *)value)) {
+ ctx->current_method = HTTP_METHOD_POST;
+ } else {
+ ctx->current_method = HTTP_METHOD_NONE;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Process DATA chunk sent by the client (by POST method).
+ *
+ * We use a single DNS message buffer for the entire connection. Therefore, we
+ * don't support interweaving DATA chunks from different streams. To successfully
+ * parse multiple subsequent streams, each one must be fully received before
+ * processing a new stream. See https://gitlab.nic.cz/knot/knot-resolver/-/issues/619
+ */
+static int data_chunk_recv_callback(nghttp2_session *h2, uint8_t flags, int32_t stream_id,
+ const uint8_t *data, size_t len, void *user_data)
+{
+ struct http_ctx *ctx = (struct http_ctx *)user_data;
+ ssize_t remaining;
+ ssize_t required;
+ bool is_first = queue_len(ctx->streams) == 0 || queue_tail(ctx->streams) != ctx->incomplete_stream;
+
+ if (ctx->incomplete_stream != stream_id) {
+ kr_log_verbose(
+ "[http] stream %d incomplete, refusing\n",
+ ctx->incomplete_stream);
+ refuse_stream(h2, stream_id);
+ ctx->incomplete_stream = -1;
+ return 0;
+ }
+
+ remaining = ctx->buf_size - ctx->submitted - ctx->buf_pos;
+ required = len;
+ /* First data chunk of the new stream */
+ if (is_first)
+ required += sizeof(uint16_t);
+
+ if (required > remaining) {
+ kr_log_error("[http] insufficient space in buffer\n");
+ ctx->incomplete_stream = -1;
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+ }
+
+ if (is_first) {
+ ctx->buf_pos = sizeof(uint16_t); /* Reserve 2B for dnsmsg len. */
+ queue_push(ctx->streams, stream_id);
+ }
+
+ memmove(ctx->buf + ctx->buf_pos, data, len);
+ ctx->buf_pos += len;
+ return 0;
+}
+
+/*
+ * Finalize existing buffer upon receiving the last frame in the stream.
+ *
+ * For GET, this would be HEADERS frame.
+ * For POST, it is a DATA frame.
+ *
+ * Unrelated frames (such as SETTINGS) are ignored (no data was buffered).
+ */
+static int on_frame_recv_callback(nghttp2_session *h2, const nghttp2_frame *frame, void *user_data)
+{
+ struct http_ctx *ctx = (struct http_ctx *)user_data;
+ ssize_t len;
+ int32_t stream_id = frame->hd.stream_id;
+ assert(stream_id != -1);
+
+ if ((frame->hd.flags & NGHTTP2_FLAG_END_STREAM) && ctx->incomplete_stream == stream_id) {
+ if (ctx->current_method == HTTP_METHOD_GET) {
+ if (process_uri_path(ctx, ctx->uri_path, stream_id) < 0) {
+ refuse_stream(h2, stream_id);
+ }
+ }
+ ctx->incomplete_stream = -1;
+ ctx->current_method = HTTP_METHOD_NONE;
+ free(ctx->uri_path);
+ ctx->uri_path = NULL;
+
+ len = ctx->buf_pos - sizeof(uint16_t);
+ if (len <= 0 || len > KNOT_WIRE_MAX_PKTSIZE) {
+ kr_log_verbose("[http] invalid dnsmsg size: %zd B\n", len);
+ return NGHTTP2_ERR_CALLBACK_FAILURE;
+ }
+
+ knot_wire_write_u16(ctx->buf, len);
+ ctx->submitted += ctx->buf_pos;
+ ctx->buf += ctx->buf_pos;
+ ctx->buf_pos = 0;
+ }
+
+ return 0;
+}
+
+/*
+ * Call on_write() callback for written (or failed) packet data.
+ */
+static void on_pkt_write(struct http_data *data, int status)
+{
+ if (!data || !data->req || !data->on_write)
+ return;
+
+ data->on_write(data->req, status);
+
+ free(data);
+}
+
+/*
+ * Cleanup for closed steams.
+ *
+ * If any stream_user_data was set, call the on_write callback to allow
+ * freeing of the underlying data structure.
+ */
+static int on_stream_close_callback(nghttp2_session *h2, int32_t stream_id,
+ uint32_t error_code, void *user_data)
+{
+ struct http_data *data;
+
+ data = nghttp2_session_get_stream_user_data(h2, stream_id);
+ if (data)
+ on_pkt_write(data, error_code == 0 ? 0 : kr_error(EIO));
+
+ return 0;
+}
+
+/*
+ * Setup and initialize connection with new HTTP/2 context.
+ */
+struct http_ctx* http_new(struct session *session, http_send_callback send_cb)
+{
+ if (!session || !send_cb)
+ return NULL;
+
+ nghttp2_session_callbacks *callbacks;
+ struct http_ctx *ctx = NULL;
+ static const nghttp2_settings_entry iv[] = {
+ { NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, HTTP_MAX_CONCURRENT_STREAMS }
+ };
+
+ nghttp2_session_callbacks_new(&callbacks);
+ nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
+ nghttp2_session_callbacks_set_send_data_callback(callbacks, send_data_callback);
+ nghttp2_session_callbacks_set_on_header_callback(callbacks, header_callback);
+ nghttp2_session_callbacks_set_on_begin_headers_callback(callbacks, begin_headers_callback);
+ nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
+ callbacks, data_chunk_recv_callback);
+ nghttp2_session_callbacks_set_on_frame_recv_callback(
+ callbacks, on_frame_recv_callback);
+ nghttp2_session_callbacks_set_on_stream_close_callback(
+ callbacks, on_stream_close_callback);
+
+ ctx = calloc(1UL, sizeof(struct http_ctx));
+ if (!ctx)
+ goto finish;
+
+ ctx->send_cb = send_cb;
+ ctx->session = session;
+ queue_init(ctx->streams);
+ ctx->incomplete_stream = -1;
+ ctx->submitted = 0;
+ ctx->current_method = HTTP_METHOD_NONE;
+ ctx->uri_path = NULL;
+
+ nghttp2_session_server_new(&ctx->h2, callbacks, ctx);
+ nghttp2_submit_settings(ctx->h2, NGHTTP2_FLAG_NONE,
+ iv, sizeof(iv)/sizeof(*iv));
+finish:
+ nghttp2_session_callbacks_del(callbacks);
+ return ctx;
+}
+
+/*
+ * Process inbound HTTP/2 data and return number of bytes read into session wire buffer.
+ *
+ * This function may trigger outgoing HTTP/2 data, such as stream resets, window updates etc.
+ */
+ssize_t http_process_input_data(struct session *session, const uint8_t *buf,
+ ssize_t nread)
+{
+ struct http_ctx *ctx = session_http_get_server_ctx(session);
+ ssize_t ret = 0;
+
+ if (!ctx->h2)
+ return kr_error(ENOSYS);
+ assert(ctx->session == session);
+
+ ctx->submitted = 0;
+ ctx->buf = session_wirebuf_get_free_start(session);
+ ctx->buf_pos = 0;
+ ctx->buf_size = session_wirebuf_get_free_size(session);
+
+ ret = nghttp2_session_mem_recv(ctx->h2, buf, nread);
+ if (ret < 0) {
+ kr_log_verbose("[http] nghttp2_session_mem_recv failed: %s (%zd)\n",
+ nghttp2_strerror(ret), ret);
+ return kr_error(EIO);
+ }
+
+ ret = nghttp2_session_send(ctx->h2);
+ if (ret < 0) {
+ kr_log_verbose("[http] nghttp2_session_send failed: %s (%zd)\n",
+ nghttp2_strerror(ret), ret);
+ return kr_error(EIO);
+ }
+
+ return ctx->submitted;
+}
+
+/*
+ * Provide data from buffer to HTTP/2 library.
+ *
+ * To avoid copying the packet wire buffer, we use NGHTTP2_DATA_FLAG_NO_COPY
+ * and take care of sending entire DATA frames ourselves with nghttp2_send_data_callback.
+ *
+ * See https://www.nghttp2.org/documentation/types.html#c.nghttp2_data_source_read_callback
+ */
+static ssize_t read_callback(nghttp2_session *h2, int32_t stream_id, uint8_t *buf,
+ size_t length, uint32_t *data_flags,
+ nghttp2_data_source *source, void *user_data)
+{
+ struct http_data *data;
+ size_t avail;
+ size_t send;
+
+ data = (struct http_data*)source->ptr;
+ avail = data->len - data->pos;
+ send = MIN(avail, length);
+
+ if (avail == send)
+ *data_flags |= NGHTTP2_DATA_FLAG_EOF;
+
+ *data_flags |= NGHTTP2_DATA_FLAG_NO_COPY;
+ return send;
+}
+
+/*
+ * Send dns response provided by the HTTTP/2 data provider.
+ *
+ * Data isn't guaranteed to be sent immediately due to underlying HTTP/2 flow control.
+ */
+static int http_send_response(nghttp2_session *h2, int32_t stream_id,
+ nghttp2_data_provider *prov)
+{
+ struct http_data *data = (struct http_data*)prov->source.ptr;
+ int ret;
+ const char *directive_max_age = "max-age=";
+ char size[MAX_DECIMAL_LENGTH(data->len)] = { 0 };
+ int max_age_len = MAX_DECIMAL_LENGTH(data->ttl) + strlen(directive_max_age);
+ char max_age[max_age_len];
+ int size_len;
+
+ memset(max_age, 0, max_age_len * sizeof(*max_age));
+ size_len = snprintf(size, MAX_DECIMAL_LENGTH(data->len), "%zu", data->len);
+ max_age_len = snprintf(max_age, max_age_len, "%s%u", directive_max_age, data->ttl);
+
+ nghttp2_nv hdrs[] = {
+ MAKE_STATIC_NV(":status", "200"),
+ MAKE_STATIC_NV("content-type", "application/dns-message"),
+ MAKE_NV("content-length", 14, size, size_len),
+ MAKE_NV("cache-control", 13, max_age, max_age_len),
+ };
+
+ ret = nghttp2_submit_response(h2, stream_id, hdrs, sizeof(hdrs)/sizeof(*hdrs), prov);
+ if (ret != 0) {
+ kr_log_verbose("[http] nghttp2_submit_response failed: %s\n", nghttp2_strerror(ret));
+ return kr_error(EIO);
+ }
+
+ ret = nghttp2_session_set_stream_user_data(h2, stream_id, (void*)data);
+ if (ret != 0) {
+ kr_log_verbose("[http] failed to set stream user data: %s\n", nghttp2_strerror(ret));
+ return kr_error(EIO);
+ }
+
+ ret = nghttp2_session_send(h2);
+ if(ret < 0) {
+ kr_log_verbose("[http] nghttp2_session_send failed: %s\n", nghttp2_strerror(ret));
+ return kr_error(EIO);
+ }
+
+ return 0;
+}
+
+/*
+ * Send HTTP/2 stream data created from packet's wire buffer.
+ */
+static int http_write_pkt(nghttp2_session *h2, knot_pkt_t *pkt, int32_t stream_id,
+ uv_write_t *req, uv_write_cb on_write)
+{
+ struct http_data *data;
+ nghttp2_data_provider prov;
+ const bool is_negative = kr_response_classify(pkt) & (PKT_NODATA|PKT_NXDOMAIN);
+
+ data = malloc(sizeof(struct http_data));
+ if (!data)
+ return kr_error(ENOMEM);
+
+ data->buf = pkt->wire;
+ data->len = pkt->size;
+ data->pos = 0;
+ data->on_write = on_write;
+ data->req = req;
+ data->ttl = packet_ttl(pkt, is_negative);
+
+ prov.source.ptr = data;
+ prov.read_callback = read_callback;
+
+ return http_send_response(h2, stream_id, &prov);
+}
+
+/*
+ * Write request to HTTP/2 stream.
+ *
+ * Packet wire buffer must stay valid until the on_write callback.
+ */
+int http_write(uv_write_t *req, uv_handle_t *handle, knot_pkt_t *pkt, int32_t stream_id,
+ uv_write_cb on_write)
+{
+ struct session *session;
+ struct http_ctx *ctx;
+ int ret;
+
+ if (!req || !pkt || !handle || !handle->data || stream_id < 0)
+ return kr_error(EINVAL);
+ req->handle = (uv_stream_t *)handle;
+
+ session = handle->data;
+ if (session_flags(session)->outgoing)
+ return kr_error(ENOSYS);
+
+ ctx = session_http_get_server_ctx(session);
+ if (!ctx || !ctx->h2)
+ return kr_error(EINVAL);
+
+ ret = http_write_pkt(ctx->h2, pkt, stream_id, req, on_write);
+ if (ret < 0)
+ return ret;
+
+ return kr_ok();
+}
+
+/*
+ * Release HTTP/2 context.
+ */
+void http_free(struct http_ctx *ctx)
+{
+ if (!ctx)
+ return;
+
+ queue_deinit(ctx->streams);
+ nghttp2_session_del(ctx->h2);
+ free(ctx);
+}
diff --git a/daemon/http.h b/daemon/http.h
new file mode 100644
index 0000000..f066277
--- /dev/null
+++ b/daemon/http.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 CZ.NIC, z.s.p.o
+ *
+ * Initial Author: Jan Hák <jan.hak@nic.cz>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <uv.h>
+#include <libknot/packet/pkt.h>
+
+#if ENABLE_DOH2
+#include <nghttp2/nghttp2.h>
+#endif
+
+#include "lib/generic/queue.h"
+
+/** Transport session (opaque). */
+struct session;
+
+typedef ssize_t(*http_send_callback)(const uint8_t *buffer,
+ const size_t buffer_len,
+ struct session *session);
+
+typedef queue_t(int32_t) queue_int32_t;
+
+typedef enum {
+ HTTP_METHOD_NONE = 0,
+ HTTP_METHOD_GET = 1,
+ HTTP_METHOD_POST = 2,
+} http_method_t;
+
+struct http_ctx {
+ struct nghttp2_session *h2;
+ http_send_callback send_cb;
+ struct session *session;
+ queue_int32_t streams; /* IDs of streams present in the buffer. */
+ int32_t incomplete_stream;
+ ssize_t submitted;
+ http_method_t current_method;
+ char *uri_path;
+ uint8_t *buf; /* Part of the wire_buf that belongs to current HTTP/2 stream. */
+ ssize_t buf_pos;
+ ssize_t buf_size;
+};
+
+#if ENABLE_DOH2
+struct http_ctx* http_new(struct session *session, http_send_callback send_cb);
+ssize_t http_process_input_data(struct session *session, const uint8_t *buf, ssize_t nread);
+int http_write(uv_write_t *req, uv_handle_t *handle, knot_pkt_t* pkt, int32_t stream_id,
+ uv_write_cb on_write);
+void http_free(struct http_ctx *ctx);
+#endif
diff --git a/daemon/io.c b/daemon/io.c
new file mode 100644
index 0000000..3617977
--- /dev/null
+++ b/daemon/io.c
@@ -0,0 +1,992 @@
+/* Copyright (C) 2014-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/io.h"
+
+#include <assert.h>
+#include <contrib/ucw/lib.h>
+#include <contrib/ucw/mempool.h>
+#include <libknot/errcode.h>
+#include <string.h>
+#include <sys/resource.h>
+
+#if ENABLE_XDP
+ #include <libknot/xdp/xdp.h>
+ #include <net/if.h>
+#endif
+
+#include "daemon/network.h"
+#include "daemon/worker.h"
+#include "daemon/tls.h"
+#include "daemon/http.h"
+#include "daemon/session.h"
+#include "contrib/cleanup.h"
+#include "lib/utils.h"
+
+#define negotiate_bufsize(func, handle, bufsize_want) do { \
+ int bufsize = 0; (func)((handle), &bufsize); \
+ if (bufsize < (bufsize_want)) { \
+ bufsize = (bufsize_want); \
+ (func)((handle), &bufsize); \
+ } \
+} while (0)
+
+static void check_bufsize(uv_handle_t* handle)
+{
+ return; /* TODO: resurrect after https://github.com/libuv/libuv/issues/419 */
+ /* We want to buffer at least N waves in advance.
+ * This is magic presuming we can pull in a whole recvmmsg width in one wave.
+ * Linux will double this the bufsize wanted.
+ */
+ const int bufsize_want = 2 * sizeof( ((struct worker_ctx *)NULL)->wire_buf ) ;
+ negotiate_bufsize(uv_recv_buffer_size, handle, bufsize_want);
+ negotiate_bufsize(uv_send_buffer_size, handle, bufsize_want);
+}
+
+#undef negotiate_bufsize
+
+static void handle_getbuf(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf)
+{
+ /* UDP sessions use worker buffer for wire data,
+ * TCP sessions use session buffer for wire data
+ * (see session_set_handle()).
+ * TLS sessions use buffer from TLS context.
+ * The content of the worker buffer is
+ * guaranteed to be unchanged only for the duration of
+ * udp_read() and tcp_read().
+ */
+ struct session *s = handle->data;
+ if (!session_flags(s)->has_tls) {
+ buf->base = (char *) session_wirebuf_get_free_start(s);
+ buf->len = session_wirebuf_get_free_size(s);
+ } else {
+ struct tls_common_ctx *ctx = session_tls_get_common_ctx(s);
+ buf->base = (char *) ctx->recv_buf;
+ buf->len = sizeof(ctx->recv_buf);
+ }
+}
+
+void udp_recv(uv_udp_t *handle, ssize_t nread, const uv_buf_t *buf,
+ const struct sockaddr *addr, unsigned flags)
+{
+ struct session *s = handle->data;
+ if (session_flags(s)->closing || nread <= 0 || addr->sa_family == AF_UNSPEC)
+ return;
+
+ if (session_flags(s)->outgoing) {
+ const struct sockaddr *peer = session_get_peer(s);
+ assert(peer->sa_family != AF_UNSPEC);
+ if (kr_sockaddr_cmp(peer, addr) != 0) {
+ kr_log_verbose("[io] <= ignoring UDP from unexpected address '%s'\n",
+ kr_straddr(addr));
+ return;
+ }
+ }
+ ssize_t consumed = session_wirebuf_consume(s, (const uint8_t *)buf->base,
+ nread);
+ assert(consumed == nread); (void)consumed;
+ session_wirebuf_process(s, addr);
+ session_wirebuf_discard(s);
+ mp_flush(the_worker->pkt_pool.ctx);
+}
+
+static int family_to_freebind_option(sa_family_t sa_family, int *level, int *name)
+{
+ switch (sa_family) {
+ case AF_INET:
+ *level = IPPROTO_IP;
+#if defined(IP_FREEBIND)
+ *name = IP_FREEBIND;
+#elif defined(IP_BINDANY)
+ *name = IP_BINDANY;
+#else
+ return kr_error(ENOTSUP);
+#endif
+ break;
+ case AF_INET6:
+#if defined(IP_FREEBIND)
+ *level = IPPROTO_IP;
+ *name = IP_FREEBIND;
+#elif defined(IPV6_BINDANY)
+ *level = IPPROTO_IPV6;
+ *name = IPV6_BINDANY;
+#else
+ return kr_error(ENOTSUP);
+#endif
+ break;
+ default:
+ return kr_error(ENOTSUP);
+ }
+ return kr_ok();
+}
+
+int io_bind(const struct sockaddr *addr, int type, const endpoint_flags_t *flags)
+{
+ const int fd = socket(addr->sa_family, type, 0);
+ if (fd < 0) return kr_error(errno);
+
+ int yes = 1;
+ if (addr->sa_family == AF_INET || addr->sa_family == AF_INET6) {
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)))
+ return kr_error(errno);
+
+#ifdef SO_REUSEPORT_LB
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT_LB, &yes, sizeof(yes)))
+ return kr_error(errno);
+#elif defined(SO_REUSEPORT) && defined(__linux__) /* different meaning on (Free)BSD */
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)))
+ return kr_error(errno);
+#endif
+
+#ifdef IPV6_V6ONLY
+ if (addr->sa_family == AF_INET6
+ && setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)))
+ return kr_error(errno);
+#endif
+ if (flags != NULL && flags->freebind) {
+ int optlevel;
+ int optname;
+ int ret = family_to_freebind_option(addr->sa_family, &optlevel, &optname);
+ if (ret) return kr_error(ret);
+ if (setsockopt(fd, optlevel, optname, &yes, sizeof(yes)))
+ return kr_error(errno);
+ }
+
+ /* Linux 3.15 has IP_PMTUDISC_OMIT which makes sockets
+ * ignore PMTU information and send packets with DF=0.
+ * This mitigates DNS fragmentation attacks by preventing
+ * forged PMTU information. FreeBSD already has same semantics
+ * without setting the option.
+ https://gitlab.nic.cz/knot/knot-dns/-/issues/640
+ */
+#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_OMIT)
+ int omit = IP_PMTUDISC_OMIT;
+ if (type == SOCK_DGRAM && addr->sa_family == AF_INET
+ && setsockopt(fd, IPPROTO_IP, IP_MTU_DISCOVER, &omit, sizeof(omit))) {
+ kr_log_error(
+ "[ io ] failed to disable Path MTU discovery for %s UDP: %s\n",
+ kr_straddr(addr), strerror(errno));
+ }
+#endif
+ }
+
+ if (bind(fd, addr, kr_sockaddr_len(addr)))
+ return kr_error(errno);
+
+ return fd;
+}
+
+int io_listen_udp(uv_loop_t *loop, uv_udp_t *handle, int fd)
+{
+ if (!handle) {
+ return kr_error(EINVAL);
+ }
+ int ret = uv_udp_init(loop, handle);
+ if (ret) return ret;
+
+ ret = uv_udp_open(handle, fd);
+ if (ret) return ret;
+
+ uv_handle_t *h = (uv_handle_t *)handle;
+ check_bufsize(h);
+ /* Handle is already created, just create context. */
+ struct session *s = session_new(h, false, false);
+ assert(s);
+ session_flags(s)->outgoing = false;
+
+ int socklen = sizeof(union inaddr);
+ ret = uv_udp_getsockname(handle, session_get_sockname(s), &socklen);
+ if (ret) {
+ kr_log_error("ERROR: getsockname failed: %s\n", uv_strerror(ret));
+ abort(); /* It might be nontrivial not to leak something here. */
+ }
+
+ return io_start_read(h);
+}
+
+void tcp_timeout_trigger(uv_timer_t *timer)
+{
+ struct session *s = timer->data;
+
+ assert(!session_flags(s)->closing);
+
+ if (!session_tasklist_is_empty(s)) {
+ int finalized = session_tasklist_finalize_expired(s);
+ the_worker->stats.timeout += finalized;
+ /* session_tasklist_finalize_expired() may call worker_task_finalize().
+ * If session is a source session and there were IO errors,
+ * worker_task_finalize() can filnalize all tasks and close session. */
+ if (session_flags(s)->closing) {
+ return;
+ }
+
+ }
+ if (!session_tasklist_is_empty(s)) {
+ uv_timer_stop(timer);
+ session_timer_start(s, tcp_timeout_trigger,
+ KR_RESOLVE_TIME_LIMIT / 2,
+ KR_RESOLVE_TIME_LIMIT / 2);
+ } else {
+ /* Normally it should not happen,
+ * but better to check if there anything in this list. */
+ while (!session_waitinglist_is_empty(s)) {
+ struct qr_task *t = session_waitinglist_pop(s, false);
+ worker_task_finalize(t, KR_STATE_FAIL);
+ worker_task_unref(t);
+ the_worker->stats.timeout += 1;
+ if (session_flags(s)->closing) {
+ return;
+ }
+ }
+ const struct network *net = &the_worker->engine->net;
+ uint64_t idle_in_timeout = net->tcp.in_idle_timeout;
+ uint64_t last_activity = session_last_activity(s);
+ uint64_t idle_time = kr_now() - last_activity;
+ if (idle_time < idle_in_timeout) {
+ idle_in_timeout -= idle_time;
+ uv_timer_stop(timer);
+ session_timer_start(s, tcp_timeout_trigger,
+ idle_in_timeout, idle_in_timeout);
+ } else {
+ struct sockaddr *peer = session_get_peer(s);
+ char *peer_str = kr_straddr(peer);
+ kr_log_verbose("[io] => closing connection to '%s'\n",
+ peer_str ? peer_str : "");
+ if (session_flags(s)->outgoing) {
+ worker_del_tcp_waiting(the_worker, peer);
+ worker_del_tcp_connected(the_worker, peer);
+ }
+ session_close(s);
+ }
+ }
+}
+
+static void tcp_recv(uv_stream_t *handle, ssize_t nread, const uv_buf_t *buf)
+{
+ struct session *s = handle->data;
+ assert(s && session_get_handle(s) == (uv_handle_t *)handle &&
+ handle->type == UV_TCP);
+
+ if (session_flags(s)->closing) {
+ return;
+ }
+
+ /* nread might be 0, which does not indicate an error or EOF.
+ * This is equivalent to EAGAIN or EWOULDBLOCK under read(2). */
+ if (nread == 0) {
+ return;
+ }
+
+ if (nread < 0 || !buf->base) {
+ if (kr_verbose_status) {
+ struct sockaddr *peer = session_get_peer(s);
+ char *peer_str = kr_straddr(peer);
+ kr_log_verbose("[io] => connection to '%s' closed by peer (%s)\n",
+ peer_str ? peer_str : "",
+ uv_strerror(nread));
+ }
+ worker_end_tcp(s);
+ return;
+ }
+
+ ssize_t consumed = 0;
+ const uint8_t *data = (const uint8_t *)buf->base;
+ ssize_t data_len = nread;
+ if (session_flags(s)->has_tls) {
+ /* buf->base points to start of the tls receive buffer.
+ Decode data free space in session wire buffer. */
+ consumed = tls_process_input_data(s, (const uint8_t *)buf->base, nread);
+ if (consumed < 0) {
+ if (kr_verbose_status) {
+ struct sockaddr *peer = session_get_peer(s);
+ char *peer_str = kr_straddr(peer);
+ kr_log_verbose("[io] => connection to '%s': "
+ "error processing TLS data, close\n",
+ peer_str ? peer_str : "");
+ }
+ worker_end_tcp(s);
+ return;
+ } else if (consumed == 0) {
+ return;
+ }
+ data = session_wirebuf_get_free_start(s);
+ data_len = consumed;
+ }
+#if ENABLE_DOH2
+ if (session_flags(s)->has_http) {
+ consumed = http_process_input_data(s, data, data_len);
+ if (consumed < 0) {
+ if (kr_verbose_status) {
+ struct sockaddr *peer = session_get_peer(s);
+ char *peer_str = kr_straddr(peer);
+ kr_log_verbose("[io] => connection to '%s': "
+ "error processing HTTP data, close\n",
+ peer_str ? peer_str : "");
+ }
+ worker_end_tcp(s);
+ return;
+ } else if (consumed == 0) {
+ return;
+ }
+ data = session_wirebuf_get_free_start(s);
+ data_len = consumed;
+ }
+#endif
+
+ /* data points to start of the free space in session wire buffer.
+ Simple increase internal counter. */
+ consumed = session_wirebuf_consume(s, data, data_len);
+ assert(consumed == data_len);
+
+ int ret = session_wirebuf_process(s, session_get_peer(s));
+ if (ret < 0) {
+ /* An error has occurred, close the session. */
+ worker_end_tcp(s);
+ }
+ session_wirebuf_compress(s);
+ mp_flush(the_worker->pkt_pool.ctx);
+}
+
+#if ENABLE_DOH2
+static ssize_t tls_send(const uint8_t *buf, const size_t len, struct session *session)
+{
+ struct tls_ctx *ctx = session_tls_get_server_ctx(session);
+ ssize_t sent = 0;
+ assert(ctx);
+
+ sent = gnutls_record_send(ctx->c.tls_session, buf, len);
+ if (sent < 0) {
+ kr_log_verbose("[http] gnutls_record_send failed: %s (%zd)\n",
+ gnutls_strerror_name(sent), sent);
+ return kr_error(EIO);
+ }
+ return sent;
+}
+#endif
+
+static void _tcp_accept(uv_stream_t *master, int status, bool tls, bool http)
+{
+ if (status != 0) {
+ return;
+ }
+
+ struct worker_ctx *worker = the_worker;
+ uv_tcp_t *client = malloc(sizeof(uv_tcp_t));
+ if (!client) {
+ return;
+ }
+ int res = io_create(master->loop, (uv_handle_t *)client,
+ SOCK_STREAM, AF_UNSPEC, tls, http);
+ if (res) {
+ if (res == UV_EMFILE) {
+ worker->too_many_open = true;
+ worker->rconcurrent_highwatermark = worker->stats.rconcurrent;
+ }
+ /* Since res isn't OK struct session wasn't allocated \ borrowed.
+ * We must release client handle only.
+ */
+ free(client);
+ return;
+ }
+
+ /* struct session was allocated \ borrowed from memory pool. */
+ struct session *s = client->data;
+ assert(session_flags(s)->outgoing == false);
+ assert(session_flags(s)->has_tls == tls);
+
+ if (uv_accept(master, (uv_stream_t *)client) != 0) {
+ /* close session, close underlying uv handles and
+ * deallocate (or return to memory pool) memory. */
+ session_close(s);
+ return;
+ }
+
+ /* Get peer's and our address. We apparently get specific sockname here
+ * even if we listened on a wildcard address. */
+ struct sockaddr *sa = session_get_peer(s);
+ int sa_len = sizeof(struct sockaddr_in6);
+ int ret = uv_tcp_getpeername(client, sa, &sa_len);
+ if (ret || sa->sa_family == AF_UNSPEC) {
+ session_close(s);
+ return;
+ }
+ sa = session_get_sockname(s);
+ sa_len = sizeof(struct sockaddr_in6);
+ ret = uv_tcp_getsockname(client, sa, &sa_len);
+ if (ret || sa->sa_family == AF_UNSPEC) {
+ session_close(s);
+ return;
+ }
+
+ /* Set deadlines for TCP connection and start reading.
+ * It will re-check every half of a request time limit if the connection
+ * is idle and should be terminated, this is an educated guess. */
+
+ const struct network *net = &worker->engine->net;
+ uint64_t idle_in_timeout = net->tcp.in_idle_timeout;
+
+ uint64_t timeout = KR_CONN_RTT_MAX / 2;
+ if (tls) {
+ timeout += TLS_MAX_HANDSHAKE_TIME;
+ struct tls_ctx *ctx = session_tls_get_server_ctx(s);
+ if (!ctx) {
+ ctx = tls_new(worker);
+ if (!ctx) {
+ session_close(s);
+ return;
+ }
+ ctx->c.session = s;
+ ctx->c.handshake_state = TLS_HS_IN_PROGRESS;
+
+ /* Configure ALPN. */
+ gnutls_datum_t proto;
+ if (!http) {
+ proto.data = (unsigned char *)"dot";
+ proto.size = 3;
+ } else {
+ proto.data = (unsigned char *)"h2";
+ proto.size = 2;
+ }
+ unsigned int flags = 0;
+#if GNUTLS_VERSION_NUMBER >= 0x030500
+ /* Mandatory ALPN means the protocol must match if and
+ * only if ALPN extension is used by the client. */
+ flags |= GNUTLS_ALPN_MANDATORY;
+#endif
+ ret = gnutls_alpn_set_protocols(ctx->c.tls_session, &proto, 1, flags);
+ if (ret != GNUTLS_E_SUCCESS) {
+ session_close(s);
+ return;
+ }
+
+ session_tls_set_server_ctx(s, ctx);
+ }
+ }
+#if ENABLE_DOH2
+ if (http) {
+ struct http_ctx *ctx = session_http_get_server_ctx(s);
+ if (!ctx) {
+ if (!tls) { /* Plain HTTP is not supported. */
+ session_close(s);
+ return;
+ }
+ ctx = http_new(s, tls_send);
+ if (!ctx) {
+ session_close(s);
+ return;
+ }
+ session_http_set_server_ctx(s, ctx);
+ }
+ }
+#endif
+ session_timer_start(s, tcp_timeout_trigger, timeout, idle_in_timeout);
+ io_start_read((uv_handle_t *)client);
+}
+
+static void tcp_accept(uv_stream_t *master, int status)
+{
+ _tcp_accept(master, status, false, false);
+}
+
+static void tls_accept(uv_stream_t *master, int status)
+{
+ _tcp_accept(master, status, true, false);
+}
+
+#if ENABLE_DOH2
+static void https_accept(uv_stream_t *master, int status)
+{
+ _tcp_accept(master, status, true, true);
+}
+#endif
+
+int io_listen_tcp(uv_loop_t *loop, uv_tcp_t *handle, int fd, int tcp_backlog, bool has_tls, bool has_http)
+{
+ uv_connection_cb connection;
+
+ if (!handle) {
+ return kr_error(EINVAL);
+ }
+ int ret = uv_tcp_init(loop, handle);
+ if (ret) return ret;
+
+ if (has_tls && has_http) {
+#if ENABLE_DOH2
+ connection = https_accept;
+#else
+ kr_log_error("[ io ] kresd was compiled without libnghttp2 support\n");
+ return kr_error(ENOPROTOOPT);
+#endif
+ } else if (has_tls) {
+ connection = tls_accept;
+ } else if (has_http) {
+ return kr_error(EPROTONOSUPPORT);
+ } else {
+ connection = tcp_accept;
+ }
+
+ ret = uv_tcp_open(handle, (uv_os_sock_t) fd);
+ if (ret) return ret;
+
+ int val; (void)val;
+ /* TCP_DEFER_ACCEPT delays accepting connections until there is readable data. */
+#ifdef TCP_DEFER_ACCEPT
+ val = KR_CONN_RTT_MAX/1000;
+ if (setsockopt(fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &val, sizeof(val))) {
+ kr_log_error("[ io ] listen TCP (defer_accept): %s\n", strerror(errno));
+ }
+#endif
+
+ ret = uv_listen((uv_stream_t *)handle, tcp_backlog, connection);
+ if (ret != 0) {
+ return ret;
+ }
+
+ /* TCP_FASTOPEN enables 1 RTT connection resumptions. */
+#ifdef TCP_FASTOPEN
+ #ifdef __linux__
+ val = 16; /* Accepts queue length hint */
+ #else
+ val = 1; /* Accepts on/off */
+ #endif
+ if (setsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN, &val, sizeof(val))) {
+ kr_log_error("[ io ] listen TCP (fastopen): %s%s\n", strerror(errno),
+ (errno != EPERM ? "" :
+ ". This may be caused by TCP Fast Open being disabled in the OS."));
+ }
+#endif
+
+ handle->data = NULL;
+ return 0;
+}
+
+
+enum io_stream_mode {
+ io_mode_text = 0,
+ io_mode_binary = 1,
+};
+
+struct io_stream_data {
+ enum io_stream_mode mode;
+ size_t blen; ///< length of `buf`
+ char *buf; ///< growing buffer residing on `pool` (mp_append_*)
+ knot_mm_t *pool;
+};
+
+/**
+ * TTY control: process input and free() the buffer.
+ *
+ * For parameters see http://docs.libuv.org/en/v1.x/stream.html#c.uv_read_cb
+ *
+ * - This is just basic read-eval-print; libedit is supported through kresc;
+ */
+void io_tty_process_input(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf)
+{
+ auto_free char *commands = buf ? buf->base : NULL;
+
+ /* Set output streams */
+ FILE *out = stdout;
+ uv_os_fd_t stream_fd = -1;
+ struct args *args = the_args;
+ struct io_stream_data *data = (struct io_stream_data*) stream->data;
+ if (nread < 0 || uv_fileno((uv_handle_t *)stream, &stream_fd)) {
+ mp_delete(data->pool->ctx);
+ uv_close((uv_handle_t *)stream, (uv_close_cb) free);
+ return;
+ }
+ if (nread <= 0) {
+ return;
+ }
+ if (stream_fd != STDIN_FILENO) {
+ uv_os_fd_t dup_fd = dup(stream_fd);
+ if (dup_fd >= 0) {
+ out = fdopen(dup_fd, "w");
+ }
+ }
+
+ /** The current single command and the remaining command(s). */
+ char *cmd, *cmd_next = NULL;
+ bool incomplete_cmd = false;
+
+ if (!(stream && commands && nread > 0)) {
+ goto finish;
+ }
+ /* Execute */
+
+ if (commands[nread - 1] != '\n') {
+ incomplete_cmd = true;
+ }
+ /* Ensure commands is 0-terminated */
+ if (nread >= buf->len) { /* only equality should be possible */
+ char *newbuf = realloc(commands, nread + 1);
+ if (!newbuf)
+ goto finish;
+ commands = newbuf;
+ }
+ commands[nread] = '\0';
+
+ char *boundary = "\n\0";
+ cmd = strtok(commands, "\n");
+ /* strtok skip '\n' but we need process alone '\n' too */
+ if (commands[0] == '\n') {
+ cmd_next = cmd;
+ cmd = boundary;
+ } else {
+ cmd_next = strtok(NULL, "\n");
+ }
+
+ /** Moving pointer to end of buffer with incomplete command. */
+ char *pbuf = data->buf + data->blen;
+ lua_State *L = the_worker->engine->L;
+ while (cmd != NULL) {
+ /* Last command is incomplete - save it and execute later */
+ if (incomplete_cmd && cmd_next == NULL) {
+ pbuf = mp_append_string(data->pool->ctx, pbuf, cmd);
+ mp_append_char(data->pool->ctx, pbuf, '\0');
+ data->buf = mp_ptr(data->pool->ctx);
+ data->blen = data->blen + strlen(cmd);
+
+ /* There is new incomplete command */
+ if (commands[nread - 1] == '\n')
+ incomplete_cmd = false;
+ goto next_iter;
+ }
+
+ /* Process incomplete command from previously call */
+ if (data->blen > 0) {
+ if (commands[0] != '\n' && commands[0] != '\0') {
+ pbuf = mp_append_string(data->pool->ctx, pbuf, cmd);
+ mp_append_char(data->pool->ctx, pbuf, '\0');
+ data->buf = mp_ptr(data->pool->ctx);
+ cmd = data->buf;
+ } else {
+ cmd = data->buf;
+ }
+ data->blen = 0;
+ pbuf = data->buf;
+ }
+
+ /* Pseudo-command for switching to "binary output"; */
+ if (strcmp(cmd, "__binary") == 0) {
+ data->mode = io_mode_binary;
+ goto next_iter;
+ }
+
+ int ret = engine_cmd(L, cmd, false);
+ const char *message = NULL;
+ size_t len_s;
+ if (lua_gettop(L) > 0) {
+ message = lua_tolstring(L, -1, &len_s);
+ }
+
+ /* Simpler output in binary mode */
+ if (data->mode == io_mode_binary) {
+ /* Leader expects length field in all cases */
+ if (!message || len_s > UINT32_MAX) {
+ kr_log_error("[io] unrepresentable respose on control socket, "
+ "sending back empty block (command '%s')\n", cmd);
+ len_s = 0;
+ }
+ uint32_t len_n = htonl(len_s);
+ fwrite(&len_n, sizeof(len_n), 1, out);
+ if (len_s > 0)
+ fwrite(message, len_s, 1, out);
+ goto next_iter;
+ }
+
+ /* Log to remote socket if connected */
+ const char *delim = args->quiet ? "" : "> ";
+ if (stream_fd != STDIN_FILENO) {
+ if (VERBOSE_STATUS)
+ fprintf(stdout, "%s\n", cmd); /* Duplicate command to logs */
+ if (message)
+ fprintf(out, "%s", message); /* Duplicate output to sender */
+ if (message || !args->quiet)
+ fprintf(out, "\n");
+ fprintf(out, "%s", delim);
+ }
+ if (stream_fd == STDIN_FILENO || VERBOSE_STATUS) {
+ /* Log to standard streams */
+ FILE *fp_out = ret ? stderr : stdout;
+ if (message)
+ fprintf(fp_out, "%s", message);
+ if (message && !args->quiet)
+ fprintf(fp_out, "\n");
+ fprintf(fp_out, "%s", delim);
+ }
+ next_iter:
+ lua_settop(L, 0); /* not required in some cases but harmless */
+ cmd = cmd_next;
+ cmd_next = strtok(NULL, "\n");
+ }
+
+finish:
+ /* Close if redirected */
+ if (stream_fd != STDIN_FILENO) {
+ fclose(out);
+ }
+}
+
+void io_tty_alloc(uv_handle_t *handle, size_t suggested, uv_buf_t *buf)
+{
+ buf->len = suggested;
+ buf->base = malloc(suggested);
+}
+
+struct io_stream_data *io_tty_alloc_data() {
+ knot_mm_t *pool = mm_ctx_mempool2(MM_DEFAULT_BLKSIZE);
+ if (!pool) {
+ return NULL;
+ }
+ struct io_stream_data *data = mm_alloc(pool, sizeof(struct io_stream_data));
+
+ data->buf = mp_start(pool->ctx, 512);
+ data->mode = io_mode_text;
+ data->blen = 0;
+ data->pool = pool;
+
+ return data;
+}
+
+void io_tty_accept(uv_stream_t *master, int status)
+{
+ struct io_stream_data *data = io_tty_alloc_data();
+ /* We can't use any allocations after mp_start() and it's easier anyway. */
+ uv_pipe_t *client = malloc(sizeof(*client));
+ client->data = data;
+
+ struct args *args = the_args;
+ if (client && client->data) {
+ uv_pipe_init(master->loop, client, 0);
+ if (uv_accept(master, (uv_stream_t *)client) != 0) {
+ mp_delete(data->pool->ctx);
+ return;
+ }
+ uv_read_start((uv_stream_t *)client, io_tty_alloc, io_tty_process_input);
+ /* Write command line */
+ if (!args->quiet) {
+ uv_buf_t buf = { "> ", 2 };
+ uv_try_write((uv_stream_t *)client, &buf, 1);
+ }
+ }
+}
+
+int io_listen_pipe(uv_loop_t *loop, uv_pipe_t *handle, int fd)
+{
+ if (!handle) {
+ return kr_error(EINVAL);
+ }
+ int ret = uv_pipe_init(loop, handle, 0);
+ if (ret) return ret;
+
+ ret = uv_pipe_open(handle, fd);
+ if (ret) return ret;
+
+ ret = uv_listen((uv_stream_t *)handle, 16, io_tty_accept);
+ if (ret) return ret;
+
+ handle->data = NULL;
+
+ return 0;
+}
+
+#if ENABLE_XDP
+static void xdp_rx(uv_poll_t* handle, int status, int events)
+{
+ const int XDP_RX_BATCH_SIZE = 64;
+ if (status < 0) {
+ kr_log_error("[xdp] poll status %d: %s\n", status, uv_strerror(status));
+ return;
+ }
+ if (events != UV_READABLE) {
+ kr_log_error("[xdp] poll unexpected events: %d\n", events);
+ return;
+ }
+
+ xdp_handle_data_t *xhd = handle->data;
+ assert(xhd && xhd->session && xhd->socket);
+ uint32_t rcvd;
+ knot_xdp_msg_t msgs[XDP_RX_BATCH_SIZE];
+ int ret = knot_xdp_recv(xhd->socket, msgs, XDP_RX_BATCH_SIZE, &rcvd
+ #if KNOT_VERSION_HEX >= 0x030100
+ , NULL
+ #endif
+ );
+ if (ret == KNOT_EOK) {
+ kr_log_verbose("[xdp] poll triggered, processing a batch of %d packets\n",
+ (int)rcvd);
+ } else {
+ kr_log_error("[xdp] knot_xdp_recv(): %d, %s\n", ret, knot_strerror(ret));
+ assert(false); // ATM it can only be returned when called incorrectly
+ return;
+ }
+ assert(rcvd <= XDP_RX_BATCH_SIZE);
+ for (int i = 0; i < rcvd; ++i) {
+ const knot_xdp_msg_t *msg = &msgs[i];
+ assert(msg->payload.iov_len <= KNOT_WIRE_MAX_PKTSIZE);
+ knot_pkt_t *kpkt = knot_pkt_new(msg->payload.iov_base, msg->payload.iov_len,
+ &the_worker->pkt_pool);
+ if (kpkt == NULL) {
+ ret = kr_error(ENOMEM);
+ } else {
+ ret = worker_submit(xhd->session,
+ (const struct sockaddr *)&msg->ip_from,
+ (const struct sockaddr *)&msg->ip_to,
+ msg->eth_from, msg->eth_to, kpkt);
+ }
+ if (ret)
+ kr_log_verbose("[xdp] worker_submit() == %d: %s\n", ret, kr_strerror(ret));
+ mp_flush(the_worker->pkt_pool.ctx);
+ }
+ knot_xdp_recv_finish(xhd->socket, msgs, rcvd);
+}
+/// Warn if the XDP program is running in emulated mode (XDP_SKB)
+static void xdp_warn_mode(const char *ifname)
+{
+ assert(ifname);
+ const unsigned if_index = if_nametoindex(ifname);
+ if (!if_index) {
+ kr_log_info("[xdp] warning: interface %s, unexpected error when converting its name: %s\n",
+ ifname, strerror(errno));
+ return;
+ }
+
+ const knot_xdp_mode_t mode = knot_eth_xdp_mode(if_index);
+ switch (mode) {
+ case KNOT_XDP_MODE_FULL:
+ return;
+ case KNOT_XDP_MODE_EMUL:
+ kr_log_info("[xdp] warning: interface %s running only with XDP emulation\n",
+ ifname);
+ return;
+ case KNOT_XDP_MODE_NONE: // enum warnings from compiler
+ break;
+ }
+ kr_log_info("[xdp] warning: interface %s running in unexpected XDP mode %d\n",
+ ifname, (int)mode);
+}
+int io_listen_xdp(uv_loop_t *loop, struct endpoint *ep, const char *ifname)
+{
+ if (!ep || !ep->handle) {
+ return kr_error(EINVAL);
+ }
+
+ // RLIMIT_MEMLOCK often needs raising when operating on BPF
+ static int ret_limit = 1;
+ if (ret_limit == 1) {
+ struct rlimit no_limit = { RLIM_INFINITY, RLIM_INFINITY };
+ ret_limit = setrlimit(RLIMIT_MEMLOCK, &no_limit)
+ ? kr_error(errno) : 0;
+ }
+ if (ret_limit) return ret_limit;
+
+ xdp_handle_data_t *xhd = malloc(sizeof(*xhd));
+ if (!xhd) return kr_error(ENOMEM);
+
+ const int port = ep->port ? ep->port : // all ports otherwise
+ #if KNOT_VERSION_HEX >= 0x030100
+ (KNOT_XDP_LISTEN_PORT_PASS | 0);
+ #else
+ KNOT_XDP_LISTEN_PORT_ALL;
+ #endif
+ xhd->socket = NULL; // needed for some reason
+ int ret = knot_xdp_init(&xhd->socket, ifname, ep->nic_queue, port,
+ KNOT_XDP_LOAD_BPF_MAYBE);
+ if (!ret) xdp_warn_mode(ifname);
+
+ if (!ret) ret = uv_idle_init(loop, &xhd->tx_waker);
+ if (ret) {
+ free(xhd);
+ return kr_error(ret);
+ }
+ assert(xhd->socket);
+ xhd->tx_waker.data = xhd->socket;
+
+ ep->fd = knot_xdp_socket_fd(xhd->socket); // probably not useful
+ ret = uv_poll_init(loop, (uv_poll_t *)ep->handle, ep->fd);
+ if (ret) {
+ knot_xdp_deinit(xhd->socket);
+ free(xhd);
+ return kr_error(ret);
+ }
+
+ // beware: this sets poll_handle->data
+ xhd->session = session_new(ep->handle, false, false);
+ assert(!session_flags(xhd->session)->outgoing);
+ session_get_sockname(xhd->session)->sa_family = AF_XDP; // to have something in there
+
+ ep->handle->data = xhd;
+ ret = uv_poll_start((uv_poll_t *)ep->handle, UV_READABLE, xdp_rx);
+ return ret;
+}
+#endif
+
+
+int io_create(uv_loop_t *loop, uv_handle_t *handle, int type, unsigned family, bool has_tls, bool has_http)
+{
+ int ret = -1;
+ if (type == SOCK_DGRAM) {
+ ret = uv_udp_init(loop, (uv_udp_t *)handle);
+ } else if (type == SOCK_STREAM) {
+ ret = uv_tcp_init_ex(loop, (uv_tcp_t *)handle, family);
+ uv_tcp_nodelay((uv_tcp_t *)handle, 1);
+ }
+ if (ret != 0) {
+ return ret;
+ }
+ struct session *s = session_new(handle, has_tls, has_http);
+ if (s == NULL) {
+ ret = -1;
+ }
+ return ret;
+}
+
+static void io_deinit(uv_handle_t *handle)
+{
+ if (!handle || !handle->data) {
+ return;
+ }
+ if (handle->type != UV_POLL) {
+ session_free(handle->data);
+ } else {
+ #if ENABLE_XDP
+ xdp_handle_data_t *xhd = handle->data;
+ uv_idle_stop(&xhd->tx_waker);
+ uv_close((uv_handle_t *)&xhd->tx_waker, NULL);
+ session_free(xhd->session);
+ knot_xdp_deinit(xhd->socket);
+ free(xhd);
+ #else
+ assert(false);
+ #endif
+ }
+}
+
+void io_free(uv_handle_t *handle)
+{
+ io_deinit(handle);
+ free(handle);
+}
+
+int io_start_read(uv_handle_t *handle)
+{
+ switch (handle->type) {
+ case UV_UDP:
+ return uv_udp_recv_start((uv_udp_t *)handle, &handle_getbuf, &udp_recv);
+ case UV_TCP:
+ return uv_read_start((uv_stream_t *)handle, &handle_getbuf, &tcp_recv);
+ default:
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+}
+
+int io_stop_read(uv_handle_t *handle)
+{
+ if (handle->type == UV_UDP) {
+ return uv_udp_recv_stop((uv_udp_t *)handle);
+ } else {
+ return uv_read_stop((uv_stream_t *)handle);
+ }
+}
diff --git a/daemon/io.h b/daemon/io.h
new file mode 100644
index 0000000..ff9ba0b
--- /dev/null
+++ b/daemon/io.h
@@ -0,0 +1,57 @@
+/* Copyright (C) 2014-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <lua.h>
+#include <uv.h>
+#include <libknot/packet/pkt.h>
+#include <gnutls/gnutls.h>
+#include "lib/generic/array.h"
+#include "daemon/worker.h"
+#include "daemon/engine.h"
+
+struct tls_ctx;
+struct tls_client_ctx;
+struct io_stream_data;
+
+/** Bind address into a file-descriptor (only, no libuv). type is e.g. SOCK_DGRAM */
+int io_bind(const struct sockaddr *addr, int type, const endpoint_flags_t *flags);
+/** Initialize a UDP handle and start listening. */
+int io_listen_udp(uv_loop_t *loop, uv_udp_t *handle, int fd);
+/** Initialize a TCP handle and start listening. */
+int io_listen_tcp(uv_loop_t *loop, uv_tcp_t *handle, int fd, int tcp_backlog, bool has_tls, bool has_http);
+/** Initialize a pipe handle and start listening. */
+int io_listen_pipe(uv_loop_t *loop, uv_pipe_t *handle, int fd);
+/** Initialize a poll handle (ep->handle) and start listening over AF_XDP on ifname.
+ * Sets ep->session. */
+int io_listen_xdp(uv_loop_t *loop, struct endpoint *ep, const char *ifname);
+
+/** Control socket / TTY - related functions. */
+void io_tty_process_input(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf);
+void io_tty_alloc(uv_handle_t *handle, size_t suggested, uv_buf_t *buf);
+void io_tty_accept(uv_stream_t *master, int status);
+struct io_stream_data *io_tty_alloc_data(void);
+
+void tcp_timeout_trigger(uv_timer_t *timer);
+
+/** Initialize the handle, incl. ->data = struct session * instance.
+ * \param type = SOCK_*
+ * \param family = AF_*
+ * \param has_tls has meanings only when type is SOCK_STREAM */
+int io_create(uv_loop_t *loop, uv_handle_t *handle, int type,
+ unsigned family, bool has_tls, bool has_http);
+void io_free(uv_handle_t *handle);
+
+int io_start_read(uv_handle_t *handle);
+int io_stop_read(uv_handle_t *handle);
+
+/** When uv_handle_t::type == UV_POLL, ::data points to this malloc-ed helper.
+ * (Other cases store a direct struct session pointer in ::data.) */
+typedef struct {
+ struct knot_xdp_socket *socket;
+ struct session *session;
+ uv_idle_t tx_waker;
+} xdp_handle_data_t;
+
diff --git a/daemon/lua/controlsock.test.lua b/daemon/lua/controlsock.test.lua
new file mode 100644
index 0000000..e3679dc
--- /dev/null
+++ b/daemon/lua/controlsock.test.lua
@@ -0,0 +1,169 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+local cqsocket = require('cqueues.socket')
+local strerror = require('cqueues.errno').strerror
+local timeout = 5 -- seconds, per socket operation
+
+-- TODO: we get memory leaks from cqueues, but CI runs this without leak detection anyway
+
+local ctrl_sock_txt, ctrl_sock_bin, ctrl_sock_txt_longcmd, ctrl_sock_bin_longcmd
+local ctrl_sock_txt_partcmd, ctrl_sock_bin_partcmd
+
+local function onerr_fail(_, method, errno, stacklevel)
+ local errmsg = string.format('socket error: method %s error %d (%s)',
+ method, errno, strerror(errno))
+ fail(debug.traceback(errmsg, stacklevel))
+end
+
+
+local function switch_to_binary_mode(sock)
+ data = sock:xread(2, nil, timeout)
+ sock:xwrite('__binary\n', nil, timeout)
+ same(data, '> ', 'propably successsful switch to binary mode')
+end
+
+local function socket_connect(path)
+ sock = cqsocket.connect({ path = path, nonblock = true })
+ sock:onerror(onerr_fail)
+ sock:setmode('bn', 'bn')
+
+ return sock
+end
+
+local function socket_fixture()
+ local path = worker.cwd..'/control/'..worker.pid
+ same(true, net.listen(path, nil, {kind = 'control'}), 'new control sockets were created')
+
+ ctrl_sock_txt = socket_connect(path)
+ ctrl_sock_txt_longcmd = socket_connect(path)
+ ctrl_sock_txt_partcmd = socket_connect(path)
+
+ ctrl_sock_bin = socket_connect(path)
+ switch_to_binary_mode(ctrl_sock_bin)
+ ctrl_sock_bin_longcmd = socket_connect(path)
+ switch_to_binary_mode(ctrl_sock_bin_longcmd)
+ ctrl_sock_bin_partcmd = socket_connect(path)
+ switch_to_binary_mode(ctrl_sock_bin_partcmd)
+end
+
+local function test_text_prompt()
+ data = ctrl_sock_txt:xread(2, nil, timeout)
+ same(data, '> ', 'text prompt looks like expected')
+end
+
+local function test_text_single_command()
+ local string = "this is test"
+ local input = string.format("'%s'\n", string)
+ local expect = input
+ ctrl_sock_txt:xwrite(input, nil, timeout)
+ data = ctrl_sock_txt:xread(#expect, nil, timeout)
+ same(data, expect,
+ 'text mode returns output in expected format')
+end
+
+local function binary_xread_len(sock)
+ data = sock:xread(4, nil, timeout)
+ local len = tonumber(data:byte(1))
+ for i=2,4 do
+ len = bit.bor(bit.lshift(len, 8), tonumber(data:byte(i)))
+ end
+
+ return len
+end
+
+local function test_binary_more_syscalls()
+ local len
+
+ ctrl_sock_bin:xwrite('worker.p', nil, timeout)
+ worker.sleep(0.01)
+ ctrl_sock_bin:xwrite('id\n', nil, timeout)
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+
+ ctrl_sock_bin:xwrite('worker.p', nil, timeout)
+ worker.sleep(0.01)
+ ctrl_sock_bin:xwrite('id\nworker.id\n', nil, timeout)
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, string.format("'%s'", worker.id),
+ 'binary mode returns string in expected format')
+
+ ctrl_sock_bin:xwrite('worker.pid', nil, timeout)
+ worker.sleep(0.01)
+ ctrl_sock_bin:xwrite('\n', nil, timeout)
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns output in expected format')
+
+ ctrl_sock_bin:xwrite('worker.pid', nil, timeout)
+ worker.sleep(0.01)
+ ctrl_sock_bin:xwrite('\nworker.id', nil, timeout)
+ worker.sleep(0.01)
+ ctrl_sock_bin:xwrite('\n', nil, timeout)
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, string.format("'%s'", worker.id),
+ 'binary mode returns string in expected format')
+
+ ctrl_sock_bin:xwrite('worker.pid\nworker.pid\nworker.pid\nworker.pid\n', nil, timeout)
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+ len = binary_xread_len(ctrl_sock_bin)
+ data = ctrl_sock_bin:xread(len, nil, timeout)
+ same(data, tostring(worker.pid),
+ 'binary mode returns number in expected format')
+end
+
+local function test_close_incomplete_cmd()
+ ctrl_sock_txt_partcmd:xwrite('worker.p', nil, timeout)
+ ctrl_sock_txt_partcmd:close()
+ pass('close text socket with short incomplete command')
+
+ ctrl_sock_bin_partcmd:xwrite('worker.p', nil, timeout)
+ ctrl_sock_bin_partcmd:close()
+ pass('close binary socket with short incomplete command')
+end
+
+
+local function test_close_during_transfer()
+ ctrl_sock_txt_longcmd:xwrite(string.rep('a', 1024*1024*10), nil, timeout)
+ ctrl_sock_txt_longcmd:close()
+ pass('close text socket with long incomplete command')
+
+ ctrl_sock_bin_longcmd:xwrite(string.rep('a', 1024*1024*10), nil, timeout)
+ ctrl_sock_bin_longcmd:close()
+ pass('close binary socket with long incomplete command')
+end
+
+local tests = {
+ socket_fixture,
+ test_text_prompt, -- prompt after connect
+ test_text_single_command,
+ test_text_prompt, -- new prompt when command is finished
+ test_close_incomplete_cmd,
+ test_close_during_transfer,
+ test_binary_more_syscalls,
+ test_text_single_command, -- command in text mode after execute commands in binary mode
+ test_text_prompt, -- new prompt when command is finished
+}
+return tests
diff --git a/daemon/lua/distro-preconfig.lua.in b/daemon/lua/distro-preconfig.lua.in
new file mode 100644
index 0000000..a27974a
--- /dev/null
+++ b/daemon/lua/distro-preconfig.lua.in
@@ -0,0 +1,16 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+local id = os.getenv('SYSTEMD_INSTANCE')
+if not id then
+ warn('environment variable $SYSTEMD_INSTANCE not set')
+else
+ -- Bind to control socket in run_dir
+ worker.control_path = '@run_dir@/control/'
+ local path = worker.control_path..id
+ local ok, err = pcall(net.listen, path, nil, { kind = 'control' })
+ if not ok then
+ warn('bind to '..path..' failed '..err)
+ end
+end
+
+-- Set cache location
+rawset(cache, 'current_storage', 'lmdb://@systemd_cache_dir@')
diff --git a/daemon/lua/kluautil.lua b/daemon/lua/kluautil.lua
new file mode 100644
index 0000000..e73e952
--- /dev/null
+++ b/daemon/lua/kluautil.lua
@@ -0,0 +1,84 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+local kluautil = {}
+
+-- Get length of table
+function kluautil.kr_table_len(t)
+ if type(t) ~= 'table' then
+ return nil
+ end
+
+ local len = 0
+ for _ in pairs(t) do
+ len = len + 1
+ end
+ return len
+end
+
+-- pack varargs including nil arguments into a table
+function kluautil.kr_table_pack(...)
+ local tab = {...}
+ tab.n = select('#', ...)
+ return tab
+end
+
+-- unpack table produced by kr_table_pack and including nil values
+function kluautil.kr_table_unpack(tab)
+ return unpack(tab, 1, tab.n)
+end
+
+-- Fetch over HTTPS
+function kluautil.kr_https_fetch(url, out_file, ca_file)
+ local http_ok, http_request = pcall(require, 'http.request')
+ local httptls_ok, http_tls = pcall(require, 'http.tls')
+ local openssl_ok, openssl_ctx = pcall(require, 'openssl.ssl.context')
+
+ if not http_ok or not httptls_ok or not openssl_ok then
+ return nil, 'error: lua-http and luaossl libraries are missing (but required)'
+ end
+ local cqerrno = require('cqueues.errno')
+
+ assert(string.match(url, '^https://'))
+
+ local req = http_request.new_from_uri(url)
+ req.tls = true
+ if ca_file then
+ req.ctx = openssl_ctx.new()
+ local store = req.ctx:getStore()
+ local load_ok, errmsg = pcall(store.add, store, ca_file)
+ if not load_ok then
+ return nil, errmsg
+ end
+ else -- use defaults
+ req.ctx = http_tls.new_client_context()
+ end
+
+ req.ctx:setVerify(openssl_ctx.VERIFY_PEER)
+
+ local headers, stream, errmsg = req:go()
+ if not headers then
+ errmsg = errmsg or 'unknown error'
+ if type(errmsg) == 'number' then
+ errmsg = cqerrno.strerror(errmsg) ..
+ ' (' .. tostring(errmsg) .. ')'
+ end
+ return nil, 'HTTP client library error: ' .. errmsg
+ end
+ if headers:get(':status') ~= "200" then
+ return nil, 'HTTP status != 200, got ' .. headers:get(':status')
+ end
+
+ local err
+ err, errmsg = stream:save_body_to_file(out_file)
+ if err == nil then
+ return nil, errmsg
+ end
+
+ out_file:seek('set', 0)
+
+ return true
+end
+
+kluautil.list_dir = kluautil_list_dir
+
+return kluautil
diff --git a/daemon/lua/kres-gen.lua b/daemon/lua/kres-gen.lua
new file mode 100644
index 0000000..6ae0557
--- /dev/null
+++ b/daemon/lua/kres-gen.lua
@@ -0,0 +1,590 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+local ffi = require('ffi')
+--[[ This file is generated by ./kres-gen.sh ]] ffi.cdef[[
+
+typedef struct knot_dump_style knot_dump_style_t;
+extern const knot_dump_style_t KNOT_DUMP_STYLE_DEFAULT;
+struct kr_cdb_api {};
+struct lru {};
+typedef enum {KNOT_ANSWER, KNOT_AUTHORITY, KNOT_ADDITIONAL} knot_section_t;
+typedef struct {
+ uint16_t pos;
+ uint16_t flags;
+ uint16_t compress_ptr[16];
+} knot_rrinfo_t;
+typedef unsigned char knot_dname_t;
+typedef struct {
+ uint16_t len;
+ uint8_t data[];
+} knot_rdata_t;
+typedef struct {
+ uint16_t count;
+ uint32_t size;
+ knot_rdata_t *rdata;
+} knot_rdataset_t;
+
+typedef struct knot_mm {
+ void *ctx, *alloc, *free;
+} knot_mm_t;
+
+typedef void *(*map_alloc_f)(void *, size_t);
+typedef void (*map_free_f)(void *baton, void *ptr);
+typedef void (*trace_log_f) (const struct kr_request *, const char *);
+typedef void (*trace_callback_f)(struct kr_request *);
+typedef uint8_t * (*alloc_wire_f)(struct kr_request *req, uint16_t *maxlen);
+typedef bool (*addr_info_f)(struct sockaddr*);
+typedef struct {
+ knot_dname_t *_owner;
+ uint32_t _ttl;
+ uint16_t type;
+ uint16_t rclass;
+ knot_rdataset_t rrs;
+ void *additional;
+} knot_rrset_t;
+
+struct kr_module;
+typedef char *(kr_prop_cb)(void *, struct kr_module *, const char *);
+typedef struct knot_pkt knot_pkt_t;
+typedef struct {
+ uint8_t *ptr[15];
+} knot_edns_options_t;
+typedef struct {
+ knot_pkt_t *pkt;
+ uint16_t pos;
+ uint16_t count;
+} knot_pktsection_t;
+typedef struct knot_compr {
+ uint8_t *wire;
+ knot_rrinfo_t *rrinfo;
+ struct {
+ uint16_t pos;
+ uint8_t labels;
+ } suffix;
+} knot_compr_t;
+struct knot_pkt {
+ uint8_t *wire;
+ size_t size;
+ size_t max_size;
+ size_t parsed;
+ uint16_t reserved;
+ uint16_t qname_size;
+ uint16_t rrset_count;
+ uint16_t flags;
+ knot_rrset_t *opt_rr;
+ knot_rrset_t *tsig_rr;
+ knot_edns_options_t *edns_opts;
+ struct {
+ uint8_t *pos;
+ size_t len;
+ } tsig_wire;
+ knot_section_t current;
+ knot_pktsection_t sections[3];
+ size_t rrset_allocd;
+ knot_rrinfo_t *rr_info;
+ knot_rrset_t *rr;
+ knot_mm_t mm;
+ knot_compr_t compr;
+};
+typedef struct {
+ void *root;
+ struct knot_mm *pool;
+} map_t;
+typedef struct trie trie_t;
+struct kr_qflags {
+ _Bool NO_MINIMIZE : 1;
+ _Bool NO_IPV6 : 1;
+ _Bool NO_IPV4 : 1;
+ _Bool TCP : 1;
+ _Bool RESOLVED : 1;
+ _Bool AWAIT_IPV4 : 1;
+ _Bool AWAIT_IPV6 : 1;
+ _Bool AWAIT_CUT : 1;
+ _Bool NO_EDNS : 1;
+ _Bool CACHED : 1;
+ _Bool NO_CACHE : 1;
+ _Bool EXPIRING : 1;
+ _Bool ALLOW_LOCAL : 1;
+ _Bool DNSSEC_WANT : 1;
+ _Bool DNSSEC_BOGUS : 1;
+ _Bool DNSSEC_INSECURE : 1;
+ _Bool DNSSEC_CD : 1;
+ _Bool STUB : 1;
+ _Bool ALWAYS_CUT : 1;
+ _Bool DNSSEC_WEXPAND : 1;
+ _Bool PERMISSIVE : 1;
+ _Bool STRICT : 1;
+ _Bool BADCOOKIE_AGAIN : 1;
+ _Bool CNAME : 1;
+ _Bool REORDER_RR : 1;
+ _Bool TRACE : 1;
+ _Bool NO_0X20 : 1;
+ _Bool DNSSEC_NODS : 1;
+ _Bool DNSSEC_OPTOUT : 1;
+ _Bool NONAUTH : 1;
+ _Bool FORWARD : 1;
+ _Bool DNS64_MARK : 1;
+ _Bool CACHE_TRIED : 1;
+ _Bool NO_NS_FOUND : 1;
+ _Bool PKT_IS_SANE : 1;
+};
+typedef struct ranked_rr_array_entry {
+ uint32_t qry_uid;
+ uint8_t rank;
+ uint8_t revalidation_cnt;
+ _Bool cached : 1;
+ _Bool yielded : 1;
+ _Bool to_wire : 1;
+ _Bool expiring : 1;
+ _Bool in_progress : 1;
+ _Bool dont_cache : 1;
+ knot_rrset_t *rr;
+} ranked_rr_array_entry_t;
+typedef struct {
+ ranked_rr_array_entry_t **at;
+ size_t len;
+ size_t cap;
+} ranked_rr_array_t;
+typedef struct {
+ union inaddr *at;
+ size_t len;
+ size_t cap;
+} inaddr_array_t;
+struct kr_zonecut {
+ knot_dname_t *name;
+ knot_rrset_t *key;
+ knot_rrset_t *trust_anchor;
+ struct kr_zonecut *parent;
+ trie_t *nsset;
+ knot_mm_t *pool;
+};
+typedef struct {
+ struct kr_query **at;
+ size_t len;
+ size_t cap;
+} kr_qarray_t;
+struct kr_rplan {
+ kr_qarray_t pending;
+ kr_qarray_t resolved;
+ struct kr_query *initial;
+ struct kr_request *request;
+ knot_mm_t *pool;
+ uint32_t next_uid;
+};
+struct kr_request_qsource_flags {
+ _Bool tcp : 1;
+ _Bool tls : 1;
+ _Bool http : 1;
+ _Bool xdp : 1;
+};
+struct kr_request {
+ struct kr_context *ctx;
+ knot_pkt_t *answer;
+ struct kr_query *current_query;
+ struct {
+ const struct sockaddr *addr;
+ const struct sockaddr *dst_addr;
+ const knot_pkt_t *packet;
+ struct kr_request_qsource_flags flags;
+ size_t size;
+ int32_t stream_id;
+ } qsource;
+ struct {
+ unsigned int rtt;
+ const struct kr_transport *transport;
+ } upstream;
+ struct kr_qflags options;
+ int state;
+ ranked_rr_array_t answ_selected;
+ ranked_rr_array_t auth_selected;
+ ranked_rr_array_t add_selected;
+ _Bool answ_validated;
+ _Bool auth_validated;
+ uint8_t rank;
+ struct kr_rplan rplan;
+ trace_log_f trace_log;
+ trace_callback_f trace_finish;
+ int vars_ref;
+ knot_mm_t pool;
+ unsigned int uid;
+ struct {
+ addr_info_f is_tls_capable;
+ addr_info_f is_tcp_connected;
+ addr_info_f is_tcp_waiting;
+ inaddr_array_t forwarding_targets;
+ } selection_context;
+ unsigned int count_no_nsaddr;
+ unsigned int count_fail_row;
+ alloc_wire_f alloc_wire_cb;
+};
+enum kr_rank {KR_RANK_INITIAL, KR_RANK_OMIT, KR_RANK_TRY, KR_RANK_INDET = 4, KR_RANK_BOGUS, KR_RANK_MISMATCH, KR_RANK_MISSING, KR_RANK_INSECURE, KR_RANK_AUTH = 16, KR_RANK_SECURE = 32};
+typedef struct kr_cdb * kr_cdb_pt;
+struct kr_cdb_stats {
+ uint64_t open;
+ uint64_t close;
+ uint64_t count;
+ uint64_t count_entries;
+ uint64_t clear;
+ uint64_t commit;
+ uint64_t read;
+ uint64_t read_miss;
+ uint64_t write;
+ uint64_t remove;
+ uint64_t remove_miss;
+ uint64_t match;
+ uint64_t match_miss;
+ uint64_t read_leq;
+ uint64_t read_leq_miss;
+ double usage_percent;
+};
+typedef struct uv_timer_s uv_timer_t;
+struct kr_cache {
+ kr_cdb_pt db;
+ const struct kr_cdb_api *api;
+ struct kr_cdb_stats stats;
+ uint32_t ttl_min;
+ uint32_t ttl_max;
+ struct timeval checkpoint_walltime;
+ uint64_t checkpoint_monotime;
+ uv_timer_t *health_timer;
+};
+typedef struct kr_layer {
+ int state;
+ struct kr_request *req;
+ const struct kr_layer_api *api;
+ knot_pkt_t *pkt;
+ struct sockaddr *dst;
+ _Bool is_stream;
+} kr_layer_t;
+typedef struct kr_layer_api {
+ int (*begin)(kr_layer_t *);
+ int (*reset)(kr_layer_t *);
+ int (*finish)(kr_layer_t *);
+ int (*consume)(kr_layer_t *, knot_pkt_t *);
+ int (*produce)(kr_layer_t *, knot_pkt_t *);
+ int (*checkout)(kr_layer_t *, knot_pkt_t *, struct sockaddr *, int);
+ int (*answer_finalize)(kr_layer_t *);
+ void *data;
+ int cb_slots[];
+} kr_layer_api_t;
+struct kr_prop {
+ kr_prop_cb *cb;
+ const char *name;
+ const char *info;
+};
+struct kr_module {
+ char *name;
+ int (*init)(struct kr_module *);
+ int (*deinit)(struct kr_module *);
+ int (*config)(struct kr_module *, const char *);
+ const kr_layer_api_t *layer;
+ const struct kr_prop *props;
+ void *lib;
+ void *data;
+};
+struct kr_server_selection {
+ _Bool initialized;
+ void (*choose_transport)(struct kr_query *, struct kr_transport **);
+ void (*update_rtt)(struct kr_query *, const struct kr_transport *, unsigned int);
+ void (*error)(struct kr_query *, const struct kr_transport *, enum kr_selection_error);
+ struct local_state *local_state;
+};
+kr_layer_t kr_layer_t_static;
+typedef int32_t (*kr_stale_cb)(int32_t ttl, const knot_dname_t *owner, uint16_t type,
+ const struct kr_query *qry);
+
+void kr_rrset_init(knot_rrset_t *rrset, knot_dname_t *owner,
+ uint16_t type, uint16_t rclass, uint32_t ttl);
+struct kr_query {
+ struct kr_query *parent;
+ knot_dname_t *sname;
+ uint16_t stype;
+ uint16_t sclass;
+ uint16_t id;
+ uint16_t reorder;
+ struct kr_qflags flags;
+ struct kr_qflags forward_flags;
+ uint32_t secret;
+ uint32_t uid;
+ uint64_t creation_time_mono;
+ uint64_t timestamp_mono;
+ struct timeval timestamp;
+ struct kr_zonecut zone_cut;
+ struct kr_layer_pickle *deferred;
+ int8_t cname_depth;
+ struct kr_query *cname_parent;
+ struct kr_request *request;
+ kr_stale_cb stale_cb;
+ struct kr_server_selection server_selection;
+};
+struct kr_context {
+ struct kr_qflags options;
+ knot_rrset_t *downstream_opt_rr;
+ knot_rrset_t *upstream_opt_rr;
+ map_t trust_anchors;
+ map_t negative_anchors;
+ struct kr_zonecut root_hints;
+ struct kr_cache cache;
+ unsigned int cache_rtt_tout_retry_interval;
+ char _stub[];
+};
+struct kr_transport {
+ knot_dname_t *ns_name;
+ /* beware: hidden stub, to avoid hardcoding sockaddr lengths */
+};
+const char *knot_strerror(int);
+knot_dname_t *knot_dname_copy(const knot_dname_t *, knot_mm_t *);
+knot_dname_t *knot_dname_from_str(uint8_t *, const char *, size_t);
+int knot_dname_in_bailiwick(const knot_dname_t *, const knot_dname_t *);
+_Bool knot_dname_is_equal(const knot_dname_t *, const knot_dname_t *);
+size_t knot_dname_labels(const uint8_t *, const uint8_t *);
+size_t knot_dname_size(const knot_dname_t *);
+void knot_dname_to_lower(knot_dname_t *);
+char *knot_dname_to_str(char *, const knot_dname_t *, size_t);
+knot_rdata_t *knot_rdataset_at(const knot_rdataset_t *, uint16_t);
+int knot_rdataset_merge(knot_rdataset_t *, const knot_rdataset_t *, knot_mm_t *);
+int knot_rrset_add_rdata(knot_rrset_t *, const uint8_t *, uint16_t, knot_mm_t *);
+void knot_rrset_free(knot_rrset_t *, knot_mm_t *);
+int knot_rrset_txt_dump(const knot_rrset_t *, char **, size_t *, const knot_dump_style_t *);
+int knot_rrset_txt_dump_data(const knot_rrset_t *, const size_t, char *, const size_t, const knot_dump_style_t *);
+size_t knot_rrset_size(const knot_rrset_t *);
+int knot_pkt_begin(knot_pkt_t *, knot_section_t);
+int knot_pkt_put_question(knot_pkt_t *, const knot_dname_t *, uint16_t, uint16_t);
+int knot_pkt_put_rotate(knot_pkt_t *, uint16_t, const knot_rrset_t *, uint16_t, uint16_t);
+knot_pkt_t *knot_pkt_new(void *, uint16_t, knot_mm_t *);
+void knot_pkt_free(knot_pkt_t *);
+int knot_pkt_parse(knot_pkt_t *, unsigned int);
+knot_pkt_t *kr_request_ensure_answer(struct kr_request *);
+struct kr_rplan *kr_resolve_plan(struct kr_request *);
+knot_mm_t *kr_resolve_pool(struct kr_request *);
+struct kr_query *kr_rplan_push(struct kr_rplan *, struct kr_query *, const knot_dname_t *, uint16_t, uint16_t);
+int kr_rplan_pop(struct kr_rplan *, struct kr_query *);
+struct kr_query *kr_rplan_resolved(struct kr_rplan *);
+struct kr_query *kr_rplan_last(struct kr_rplan *);
+int kr_forward_add_target(struct kr_request *, const struct sockaddr *);
+void kr_log_req(const struct kr_request * const, uint32_t, const unsigned int, const char *, const char *, ...);
+void kr_log_q(const struct kr_query * const, const char *, const char *, ...);
+int kr_make_query(struct kr_query *, knot_pkt_t *);
+void kr_pkt_make_auth_header(knot_pkt_t *);
+int kr_pkt_put(knot_pkt_t *, const knot_dname_t *, uint32_t, uint16_t, uint16_t, const uint8_t *, uint16_t);
+int kr_pkt_recycle(knot_pkt_t *);
+int kr_pkt_clear_payload(knot_pkt_t *);
+uint16_t kr_pkt_has_dnssec(const knot_pkt_t *);
+uint16_t kr_pkt_qclass(const knot_pkt_t *);
+uint16_t kr_pkt_qtype(const knot_pkt_t *);
+char *kr_pkt_text(const knot_pkt_t *);
+void kr_rnd_buffered(void *, unsigned int);
+uint32_t kr_rrsig_sig_inception(const knot_rdata_t *);
+uint32_t kr_rrsig_sig_expiration(const knot_rdata_t *);
+uint16_t kr_rrsig_type_covered(const knot_rdata_t *);
+const char *kr_inaddr(const struct sockaddr *);
+int kr_inaddr_family(const struct sockaddr *);
+int kr_inaddr_len(const struct sockaddr *);
+int kr_inaddr_str(const struct sockaddr *, char *, size_t *);
+int kr_sockaddr_cmp(const struct sockaddr *, const struct sockaddr *);
+int kr_sockaddr_len(const struct sockaddr *);
+uint16_t kr_inaddr_port(const struct sockaddr *);
+int kr_straddr_family(const char *);
+int kr_straddr_subnet(void *, const char *);
+int kr_bitcmp(const char *, const char *, int);
+int kr_family_len(int);
+struct sockaddr *kr_straddr_socket(const char *, int, knot_mm_t *);
+int kr_straddr_split(const char *, char * restrict, uint16_t *);
+_Bool kr_rank_test(uint8_t, uint8_t);
+int kr_ranked_rrarray_add(ranked_rr_array_t *, const knot_rrset_t *, uint8_t, _Bool, uint32_t, knot_mm_t *);
+int kr_ranked_rrarray_finalize(ranked_rr_array_t *, uint32_t, knot_mm_t *);
+void kr_qflags_set(struct kr_qflags *, struct kr_qflags);
+void kr_qflags_clear(struct kr_qflags *, struct kr_qflags);
+int kr_zonecut_add(struct kr_zonecut *, const knot_dname_t *, const void *, int);
+_Bool kr_zonecut_is_empty(struct kr_zonecut *);
+void kr_zonecut_set(struct kr_zonecut *, const knot_dname_t *);
+uint64_t kr_now();
+const char *kr_strptime_diff(const char *, const char *, const char *, double *);
+time_t kr_file_mtime(const char *);
+long long kr_fssize(const char *);
+const char *kr_dirent_name(const struct dirent *);
+void lru_free_items_impl(struct lru *);
+struct lru *lru_create_impl(unsigned int, unsigned int, knot_mm_t *, knot_mm_t *);
+void *lru_get_impl(struct lru *, const char *, unsigned int, unsigned int, _Bool, _Bool *);
+void *mm_realloc(knot_mm_t *, void *, size_t, size_t);
+knot_rrset_t *kr_ta_get(map_t *, const knot_dname_t *);
+int kr_ta_add(map_t *, const knot_dname_t *, uint16_t, uint32_t, const uint8_t *, uint16_t);
+int kr_ta_del(map_t *, const knot_dname_t *);
+void kr_ta_clear(map_t *);
+_Bool kr_dnssec_key_ksk(const uint8_t *);
+_Bool kr_dnssec_key_revoked(const uint8_t *);
+int kr_dnssec_key_tag(uint16_t, const uint8_t *, size_t);
+int kr_dnssec_key_match(const uint8_t *, size_t, const uint8_t *, size_t);
+int kr_cache_closest_apex(struct kr_cache *, const knot_dname_t *, _Bool, knot_dname_t **);
+int kr_cache_insert_rr(struct kr_cache *, const knot_rrset_t *, const knot_rrset_t *, uint8_t, uint32_t);
+int kr_cache_remove(struct kr_cache *, const knot_dname_t *, uint16_t);
+int kr_cache_remove_subtree(struct kr_cache *, const knot_dname_t *, _Bool, int);
+int kr_cache_commit(struct kr_cache *);
+uint32_t packet_ttl(const knot_pkt_t *, _Bool);
+typedef struct {
+ int sock_type;
+ _Bool tls;
+ _Bool http;
+ _Bool xdp;
+ _Bool freebind;
+ const char *kind;
+} endpoint_flags_t;
+typedef struct {
+ char **at;
+ size_t len;
+ size_t cap;
+} addr_array_t;
+typedef struct {
+ int fd;
+ endpoint_flags_t flags;
+} flagged_fd_t;
+typedef struct {
+ flagged_fd_t *at;
+ size_t len;
+ size_t cap;
+} flagged_fd_array_t;
+typedef struct {
+ const char **at;
+ size_t len;
+ size_t cap;
+} config_array_t;
+struct args {
+ addr_array_t addrs;
+ addr_array_t addrs_tls;
+ flagged_fd_array_t fds;
+ int control_fd;
+ int forks;
+ config_array_t config;
+ const char *rundir;
+ _Bool interactive;
+ _Bool quiet;
+ _Bool tty_binary_output;
+};
+struct args *the_args;
+struct endpoint {
+ void *handle;
+ int fd;
+ int family;
+ uint16_t port;
+ int16_t nic_queue;
+ _Bool engaged;
+ endpoint_flags_t flags;
+};
+struct request_ctx {
+ struct kr_request req;
+ struct worker_ctx *worker;
+ struct qr_task *task;
+ /* beware: hidden stub, to avoid hardcoding sockaddr lengths */
+};
+struct qr_task {
+ struct request_ctx *ctx;
+ /* beware: hidden stub, to avoid qr_tasklist_t */
+};
+int worker_resolve_exec(struct qr_task *, knot_pkt_t *);
+knot_pkt_t *worker_resolve_mk_pkt(const char *, uint16_t, uint16_t, const struct kr_qflags *);
+struct qr_task *worker_resolve_start(knot_pkt_t *, struct kr_qflags);
+struct engine {
+ struct kr_context resolver;
+ char _stub[];
+};
+struct worker_ctx {
+ struct engine *engine;
+ char _stub[];
+};
+struct worker_ctx *the_worker;
+typedef struct {
+ uint8_t bitmap[32];
+ uint8_t length;
+} zs_win_t;
+typedef struct {
+ uint8_t excl_flag;
+ uint16_t addr_family;
+ uint8_t prefix_length;
+} zs_apl_t;
+typedef struct {
+ uint32_t d1;
+ uint32_t d2;
+ uint32_t m1;
+ uint32_t m2;
+ uint32_t s1;
+ uint32_t s2;
+ uint32_t alt;
+ uint64_t siz;
+ uint64_t hp;
+ uint64_t vp;
+ int8_t lat_sign;
+ int8_t long_sign;
+ int8_t alt_sign;
+} zs_loc_t;
+typedef enum {ZS_STATE_NONE, ZS_STATE_DATA, ZS_STATE_ERROR, ZS_STATE_INCLUDE, ZS_STATE_EOF, ZS_STATE_STOP} zs_state_t;
+typedef struct zs_scanner zs_scanner_t;
+typedef struct zs_scanner {
+ int cs;
+ int top;
+ int stack[16];
+ _Bool multiline;
+ uint64_t number64;
+ uint64_t number64_tmp;
+ uint32_t decimals;
+ uint32_t decimal_counter;
+ uint32_t item_length;
+ uint32_t item_length_position;
+ uint8_t *item_length_location;
+ uint32_t buffer_length;
+ uint8_t buffer[65535];
+ char include_filename[65535];
+ char *path;
+ zs_win_t windows[256];
+ int16_t last_window;
+ zs_apl_t apl;
+ zs_loc_t loc;
+ uint8_t addr[16];
+ _Bool long_string;
+ uint8_t *dname;
+ uint32_t *dname_length;
+ uint32_t dname_tmp_length;
+ uint32_t r_data_tail;
+ uint32_t zone_origin_length;
+ uint8_t zone_origin[318];
+ uint16_t default_class;
+ uint32_t default_ttl;
+ zs_state_t state;
+ struct {
+ _Bool automatic;
+ void (*record)(zs_scanner_t *);
+ void (*error)(zs_scanner_t *);
+ void (*comment)(zs_scanner_t *);
+ void *data;
+ } process;
+ struct {
+ const char *start;
+ const char *current;
+ const char *end;
+ _Bool eof;
+ _Bool mmaped;
+ } input;
+ struct {
+ char *name;
+ int descriptor;
+ } file;
+ struct {
+ int code;
+ uint64_t counter;
+ _Bool fatal;
+ } error;
+ uint64_t line_counter;
+ uint32_t r_owner_length;
+ uint8_t r_owner[318];
+ uint16_t r_class;
+ uint32_t r_ttl;
+ uint16_t r_type;
+ uint32_t r_data_length;
+ uint8_t r_data[65535];
+} zs_scanner_t;
+void zs_deinit(zs_scanner_t *);
+int zs_init(zs_scanner_t *, const char *, const uint16_t, const uint32_t);
+int zs_parse_record(zs_scanner_t *);
+int zs_set_input_file(zs_scanner_t *, const char *);
+int zs_set_input_string(zs_scanner_t *, const char *, size_t);
+const char *zs_strerror(const int);
+]]
diff --git a/daemon/lua/kres-gen.sh b/daemon/lua/kres-gen.sh
new file mode 100755
index 0000000..e4745a8
--- /dev/null
+++ b/daemon/lua/kres-gen.sh
@@ -0,0 +1,324 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Run with "ninja kres-gen" to re-generate kres-gen.lua
+set -o pipefail -o errexit -o nounset
+
+cd "$(dirname ${0})"
+CDEFS="../../scripts/gen-cdefs.sh"
+LIBKRES="${MESON_BUILD_ROOT}/lib/libkres.so"
+KRESD="${MESON_BUILD_ROOT}/daemon/kresd"
+if [ ! -e "$LIBKRES" ]; then
+ # We probably use static libkres.
+ LIBKRES="$KRESD"
+fi
+
+for REQFILE in "$CDEFS" "$LIBKRES" "$KRESD"
+do
+ test '!' -s "$REQFILE" -a -r "$REQFILE" \
+ && echo "Required file $REQFILE cannot be read, did you build binaries and shared libraries?" \
+ && exit 1
+done
+
+# Write to kres-gen.lua instead of stdout
+mv kres-gen.lua{,.bak} ||:
+exec 5<&1- # move stdout into FD 5
+exec 1<>kres-gen.lua # replace stdout with file
+
+restore() {
+ exec 1>&- # close stdout redirected into kres-gen.lua
+ exec 1<&5- # restore original stdout
+ mv -v kres-gen.lua{,.fail} ||:
+ mv -v kres-gen.lua{.bak,} ||:
+ (>&2 echo "Failed to re-generate kres-gen.lua! Missing debugsymbols? Missing shared library?")
+}
+trap restore ERR INT TERM
+
+### Dev's guide
+#
+# C declarations for lua are (mostly) generated to simplify maintenance.
+# (Avoid typos, accidental mismatches, etc.)
+#
+# To regenerate the C definitions for lua:
+# - you need to have debugging symbols for knot-dns and knot-resolver;
+# you get those by compiling with -g; for knot-dns it might be enough
+# to just install it with debugging symbols included (in your distro way)
+# - run ninja kres-gen
+# - the knot-dns libraries are found via pkg-config
+# - you also need gdb on $PATH
+
+printf -- "-- SPDX-License-Identifier: GPL-3.0-or-later\n\n"
+printf -- "local ffi = require('ffi')\n"
+printf -- "--[[ This file is generated by ./kres-gen.sh ]] ffi.cdef[[\n"
+
+## Various types (mainly), from libknot and libkres
+
+printf "
+typedef struct knot_dump_style knot_dump_style_t;
+extern const knot_dump_style_t KNOT_DUMP_STYLE_DEFAULT;
+struct kr_cdb_api {};
+struct lru {};
+"
+
+${CDEFS} ${LIBKRES} types <<-EOF
+ knot_section_t
+ knot_rrinfo_t
+ knot_dname_t
+ knot_rdata_t
+ knot_rdataset_t
+EOF
+
+# The generator doesn't work well with typedefs of functions.
+printf "
+typedef struct knot_mm {
+ void *ctx, *alloc, *free;
+} knot_mm_t;
+
+typedef void *(*map_alloc_f)(void *, size_t);
+typedef void (*map_free_f)(void *baton, void *ptr);
+typedef void (*trace_log_f) (const struct kr_request *, const char *);
+typedef void (*trace_callback_f)(struct kr_request *);
+typedef uint8_t * (*alloc_wire_f)(struct kr_request *req, uint16_t *maxlen);
+typedef bool (*addr_info_f)(struct sockaddr*);
+"
+
+genResType() {
+ echo "$1" | ${CDEFS} ${LIBKRES} types
+}
+
+# No simple way to fixup this rename in ./kres.lua AFAIK.
+genResType "knot_rrset_t" | sed 's/\<owner\>/_owner/; s/\<ttl\>/_ttl/'
+
+printf "
+struct kr_module;
+typedef char *(kr_prop_cb)(void *, struct kr_module *, const char *);
+"
+
+${CDEFS} ${LIBKRES} types <<-EOF
+ #knot_pkt_t contains indirect recursion
+ typedef knot_pkt_t
+ knot_edns_options_t
+ knot_pktsection_t
+ knot_compr_t
+ struct knot_pkt
+ # lib/generic/
+ map_t
+ #trie_t inside is private to libknot
+ typedef trie_t
+ # libkres
+ struct kr_qflags
+ ranked_rr_array_entry_t
+ ranked_rr_array_t
+ inaddr_array_t
+ struct kr_zonecut
+ kr_qarray_t
+ struct kr_rplan
+ struct kr_request_qsource_flags
+ struct kr_request
+ enum kr_rank
+ typedef kr_cdb_pt
+ struct kr_cdb_stats
+ typedef uv_timer_t
+ struct kr_cache
+ # lib/layer.h
+ kr_layer_t
+ kr_layer_api_t
+ # lib/module.h
+ struct kr_prop
+ struct kr_module
+ struct kr_server_selection
+EOF
+
+# a static variable; the line might not be simple to generate
+printf "kr_layer_t kr_layer_t_static;"
+
+printf "
+typedef int32_t (*kr_stale_cb)(int32_t ttl, const knot_dname_t *owner, uint16_t type,
+ const struct kr_query *qry);
+
+void kr_rrset_init(knot_rrset_t *rrset, knot_dname_t *owner,
+ uint16_t type, uint16_t rclass, uint32_t ttl);
+"
+
+## Some definitions would need too many deps, so shorten them.
+
+genResType "struct kr_query"
+
+genResType "struct kr_context" | sed '/module_array_t/,$ d'
+printf "\tchar _stub[];\n};\n"
+
+
+echo "struct kr_transport" | ${CDEFS} ${KRESD} types | sed '/union /,$ d'
+printf "\t/* beware: hidden stub, to avoid hardcoding sockaddr lengths */\n};\n"
+
+## libknot API
+${CDEFS} libknot functions <<-EOF
+# Utils
+ knot_strerror
+# Domain names
+ knot_dname_copy
+ knot_dname_from_str
+ knot_dname_in_bailiwick
+ knot_dname_is_equal
+ knot_dname_labels
+ knot_dname_size
+ knot_dname_to_lower
+ knot_dname_to_str
+# Resource records
+ knot_rdataset_at
+ knot_rdataset_merge
+ knot_rrset_add_rdata
+ knot_rrset_free
+ knot_rrset_txt_dump
+ knot_rrset_txt_dump_data
+ knot_rrset_size
+# Packet
+ knot_pkt_begin
+ knot_pkt_put_question
+ knot_pkt_put_rotate
+ knot_pkt_new
+ knot_pkt_free
+ knot_pkt_parse
+EOF
+
+## libkres API
+${CDEFS} ${LIBKRES} functions <<-EOF
+# Resolution request
+ kr_request_ensure_answer
+ kr_resolve_plan
+ kr_resolve_pool
+# Resolution plan
+ kr_rplan_push
+ kr_rplan_pop
+ kr_rplan_resolved
+ kr_rplan_last
+# Forwarding
+ kr_forward_add_target
+# Utils
+ kr_log_req
+ kr_log_q
+ kr_make_query
+ kr_pkt_make_auth_header
+ kr_pkt_put
+ kr_pkt_recycle
+ kr_pkt_clear_payload
+ kr_pkt_has_dnssec
+ kr_pkt_qclass
+ kr_pkt_qtype
+ kr_pkt_text
+ kr_rnd_buffered
+ kr_rrsig_sig_inception
+ kr_rrsig_sig_expiration
+ kr_rrsig_type_covered
+ kr_inaddr
+ kr_inaddr_family
+ kr_inaddr_len
+ kr_inaddr_str
+ kr_sockaddr_cmp
+ kr_sockaddr_len
+ kr_inaddr_port
+ kr_straddr_family
+ kr_straddr_subnet
+ kr_bitcmp
+ kr_family_len
+ kr_straddr_socket
+ kr_straddr_split
+ kr_rank_test
+ kr_ranked_rrarray_add
+ kr_ranked_rrarray_finalize
+ kr_qflags_set
+ kr_qflags_clear
+ kr_zonecut_add
+ kr_zonecut_is_empty
+ kr_zonecut_set
+ kr_now
+ kr_strptime_diff
+ kr_file_mtime
+ kr_fssize
+ kr_dirent_name
+ lru_free_items_impl
+ lru_create_impl
+ lru_get_impl
+ mm_realloc
+# Trust anchors
+ kr_ta_get
+ kr_ta_add
+ kr_ta_del
+ kr_ta_clear
+# DNSSEC
+ kr_dnssec_key_ksk
+ kr_dnssec_key_revoked
+ kr_dnssec_key_tag
+ kr_dnssec_key_match
+# Cache
+ kr_cache_closest_apex
+ kr_cache_insert_rr
+ kr_cache_remove
+ kr_cache_remove_subtree
+ kr_cache_commit
+ # FIXME: perhaps rename this exported symbol
+ packet_ttl
+EOF
+
+
+## kresd itself: worker stuff
+
+${CDEFS} ${KRESD} types <<-EOF
+ endpoint_flags_t
+ # struct args is a bit complex
+ addr_array_t
+ flagged_fd_t
+ flagged_fd_array_t
+ config_array_t
+ struct args
+EOF
+echo "struct args *the_args;"
+
+echo "struct endpoint" | ${CDEFS} ${KRESD} types | sed 's/uv_handle_t \*/void */'
+echo "struct request_ctx" | ${CDEFS} ${KRESD} types | sed '/struct {/,$ d'
+printf "\t/* beware: hidden stub, to avoid hardcoding sockaddr lengths */\n};\n"
+
+echo "struct qr_task" | ${CDEFS} ${KRESD} types | sed '/pktbuf/,$ d'
+printf "\t/* beware: hidden stub, to avoid qr_tasklist_t */\n};\n"
+
+
+${CDEFS} ${KRESD} functions <<-EOF
+ worker_resolve_exec
+ worker_resolve_mk_pkt
+ worker_resolve_start
+EOF
+
+echo "struct engine" | ${CDEFS} ${KRESD} types | sed '/struct network/,$ d'
+printf "\tchar _stub[];\n};\n"
+
+echo "struct worker_ctx" | ${CDEFS} ${KRESD} types | sed '/uv_loop_t/,$ d'
+printf "\tchar _stub[];\n};\n"
+
+echo "struct worker_ctx *the_worker;"
+
+
+## libzscanner API for ./zonefile.lua
+${CDEFS} libzscanner types <<-EOF
+ zs_win_t
+ zs_apl_t
+ zs_loc_t
+ zs_state_t
+ #zs_scanner_t contains recursion
+ typedef zs_scanner_t
+ zs_scanner_t
+EOF
+${CDEFS} libzscanner functions <<-EOF
+ zs_deinit
+ zs_init
+ zs_parse_record
+ zs_set_input_file
+ zs_set_input_string
+ zs_strerror
+EOF
+
+printf "]]\n"
+
+rm kres-gen.lua.bak ||:
+(>&2 echo "Successfully re-generated ${PWD}/kres-gen.lua")
+
+exit 0
diff --git a/daemon/lua/kres.lua b/daemon/lua/kres.lua
new file mode 100644
index 0000000..640d842
--- /dev/null
+++ b/daemon/lua/kres.lua
@@ -0,0 +1,1072 @@
+-- LuaJIT ffi bindings for libkres, a DNS resolver library.
+-- SPDX-License-Identifier: GPL-3.0-or-later
+--
+-- @note Since it's statically compiled, it expects to find the symbols in the C namespace.
+
+local kres -- the module
+
+local ffi = require('ffi')
+local bit = require('bit')
+local bor = bit.bor
+local band = bit.band
+local C = ffi.C
+local knot = ffi.load(libknot_SONAME)
+
+-- Inverse table
+local function itable(t, tolower)
+ local it = {}
+ for k,v in pairs(t) do it[v] = tolower and string.lower(k) or k end
+ return it
+end
+
+-- Byte order conversions
+local function htonl(x) return x end
+local htons = htonl
+if ffi.abi('le') then
+ htonl = bit.bswap
+ function htons(x) return bit.rshift(htonl(x), 16) end
+end
+
+-- Basic types
+local u16_p = ffi.typeof('uint16_t *')
+
+-- Various declarations that are very stable.
+ffi.cdef[[
+/*
+ * Data structures
+ */
+
+/* stdlib */
+typedef long time_t;
+struct timeval {
+ time_t tv_sec;
+ time_t tv_usec;
+};
+struct sockaddr {
+ uint16_t sa_family;
+ uint8_t _stub[]; /* Do not touch */
+};
+
+struct knot_error {
+ int code;
+};
+
+/*
+ * libc APIs
+ */
+void * malloc(size_t size);
+void free(void *ptr);
+int inet_pton(int af, const char *src, void *dst);
+int gettimeofday(struct timeval *tv, struct timezone *tz);
+]]
+
+require('kres-gen')
+
+-- Error code representation
+local knot_error_t = ffi.typeof('struct knot_error')
+ffi.metatype(knot_error_t, {
+ -- Convert libknot error strings
+ __tostring = function(self)
+ return ffi.string(knot.knot_strerror(self.code))
+ end,
+});
+
+-- Constant tables
+local const_class = {
+ IN = 1,
+ CH = 3,
+ NONE = 254,
+ ANY = 255,
+}
+local const_type = {
+ A = 1,
+ NS = 2,
+ MD = 3,
+ MF = 4,
+ CNAME = 5,
+ SOA = 6,
+ MB = 7,
+ MG = 8,
+ MR = 9,
+ NULL = 10,
+ WKS = 11,
+ PTR = 12,
+ HINFO = 13,
+ MINFO = 14,
+ MX = 15,
+ TXT = 16,
+ RP = 17,
+ AFSDB = 18,
+ X25 = 19,
+ ISDN = 20,
+ RT = 21,
+ NSAP = 22,
+ ['NSAP-PTR'] = 23,
+ SIG = 24,
+ KEY = 25,
+ PX = 26,
+ GPOS = 27,
+ AAAA = 28,
+ LOC = 29,
+ NXT = 30,
+ EID = 31,
+ NIMLOC = 32,
+ SRV = 33,
+ ATMA = 34,
+ NAPTR = 35,
+ KX = 36,
+ CERT = 37,
+ A6 = 38,
+ DNAME = 39,
+ SINK = 40,
+ OPT = 41,
+ APL = 42,
+ DS = 43,
+ SSHFP = 44,
+ IPSECKEY = 45,
+ RRSIG = 46,
+ NSEC = 47,
+ DNSKEY = 48,
+ DHCID = 49,
+ NSEC3 = 50,
+ NSEC3PARAM = 51,
+ TLSA = 52,
+ SMIMEA = 53,
+ HIP = 55,
+ NINFO = 56,
+ RKEY = 57,
+ TALINK = 58,
+ CDS = 59,
+ CDNSKEY = 60,
+ OPENPGPKEY = 61,
+ CSYNC = 62,
+ SPF = 99,
+ UINFO = 100,
+ UID = 101,
+ GID = 102,
+ UNSPEC = 103,
+ NID = 104,
+ L32 = 105,
+ L64 = 106,
+ LP = 107,
+ EUI48 = 108,
+ EUI64 = 109,
+ TKEY = 249,
+ TSIG = 250,
+ IXFR = 251,
+ AXFR = 252,
+ MAILB = 253,
+ MAILA = 254,
+ ANY = 255,
+ URI = 256,
+ CAA = 257,
+ AVC = 258,
+ DOA = 259,
+ TA = 32768,
+ DLV = 32769,
+}
+local const_section = {
+ ANSWER = 0,
+ AUTHORITY = 1,
+ ADDITIONAL = 2,
+}
+local const_opcode = {
+ QUERY = 0,
+ IQUERY = 1,
+ STATUS = 2,
+ NOTIFY = 4,
+ UPDATE = 5,
+}
+local const_rcode = {
+ NOERROR = 0,
+ FORMERR = 1,
+ SERVFAIL = 2,
+ NXDOMAIN = 3,
+ NOTIMPL = 4,
+ REFUSED = 5,
+ YXDOMAIN = 6,
+ YXRRSET = 7,
+ NXRRSET = 8,
+ NOTAUTH = 9,
+ NOTZONE = 10,
+ BADVERS = 16,
+ BADCOOKIE = 23,
+}
+-- This corresponds to `enum kr_rank`, it's not possible to do this without introspection unfortunately
+local const_rank = {
+ INITIAL = 0,
+ OMIT = 1,
+ TRY = 2,
+ INDET = 4,
+ BOGUS = 5,
+ MISMATCH = 6,
+ MISSING = 7,
+ INSECURE = 8,
+ AUTH = 16,
+ SECURE = 32
+}
+
+-- Constant tables
+local const_class_str = itable(const_class)
+local const_type_str = itable(const_type)
+local const_rcode_str = itable(const_rcode)
+local const_opcode_str = itable(const_opcode)
+local const_section_str = itable(const_section)
+local const_rank_str = itable(const_rank)
+
+-- Metatype for RR types to allow anonymous types
+setmetatable(const_type, {
+ __index = function (t, k)
+ local v = rawget(t, k)
+ if v then return v end
+ -- Allow TYPE%d notation
+ if string.find(k, 'TYPE', 1, true) then
+ return tonumber(k:sub(5))
+ end
+ -- Unknown type
+ return
+ end
+})
+
+-- Metatype for RR types to allow anonymous string types
+setmetatable(const_type_str, {
+ __index = function (t, k)
+ local v = rawget(t, k)
+ if v then return v end
+ return string.format('TYPE%d', k)
+ end
+})
+
+-- Metatype for timeval
+local timeval_t = ffi.typeof('struct timeval')
+
+-- Metatype for sockaddr
+local addr_buf = ffi.new('char[16]')
+local str_addr_buf = ffi.new('char[46 + 1 + 6 + 1]') -- INET6_ADDRSTRLEN + #port + \0
+local str_addr_buf_len = ffi.sizeof(str_addr_buf)
+local sockaddr_t = ffi.typeof('struct sockaddr')
+ffi.metatype( sockaddr_t, {
+ __index = {
+ len = function(sa) return C.kr_inaddr_len(sa) end,
+ ip = function (sa) return C.kr_inaddr(sa) end,
+ family = function (sa) return C.kr_inaddr_family(sa) end,
+ port = function (sa) return C.kr_inaddr_port(sa) end,
+ },
+ __tostring = function(sa)
+ assert(ffi.istype(sockaddr_t, sa))
+ local len = ffi.new('size_t[1]', str_addr_buf_len)
+ local ret = C.kr_inaddr_str(sa, str_addr_buf, len)
+ if ret ~= 0 then
+ error('kr_inaddr_str failed: ' .. tostring(ret))
+ end
+ return ffi.string(str_addr_buf)
+ end,
+
+})
+
+-- Parametrized LRU table
+local typed_lru_t = 'struct { $ value_type[1]; struct lru * lru; }'
+
+-- Metatype for LRU
+local lru_metatype = {
+ -- Create a new LRU with given value type
+ -- By default the LRU will have a capacity of 65536 elements
+ -- Note: At the point the parametrized type must be finalized
+ __new = function (ct, max_slots, alignment)
+ -- {0} will make sure that the value is coercible to a number
+ local o = ffi.new(ct, {0}, C.lru_create_impl(max_slots or 65536, alignment or 1, nil, nil))
+ if o.lru == nil then
+ return
+ end
+ return o
+ end,
+ -- Destructor to clean allocated memory
+ __gc = function (self)
+ assert(self.lru ~= nil)
+ C.lru_free_items_impl(self.lru)
+ C.free(self.lru)
+ self.lru = nil
+ end,
+ __index = {
+ -- Look up key and return reference to current
+ -- Note: The key will be inserted if it doesn't exist
+ get_ref = function (self, key, key_len, allow_insert)
+ local insert = allow_insert and true or false
+ local ptr = C.lru_get_impl(self.lru, key, key_len or #key, ffi.sizeof(self.value_type[0]), insert, nil)
+ if ptr ~= nil then
+ return ffi.cast(self.value_type, ptr)
+ end
+ end,
+ -- Look up key and return current value
+ get = function (self, key, key_len)
+ local ref = self:get_ref(key, key_len, false)
+ if ref then
+ return ref[0]
+ end
+ end,
+ -- Set value for key to given value
+ set = function (self, key, value, key_len)
+ local ref = self:get_ref(key, key_len, true)
+ if ref then
+ ref[0] = value
+ return true
+ end
+ end,
+ },
+}
+
+-- Pretty print for domain name
+local function dname2str(dname)
+ if dname == nil then return end
+ local text_name = ffi.gc(C.knot_dname_to_str(nil, dname, 0), C.free)
+ if text_name ~= nil then
+ return ffi.string(text_name)
+ end
+end
+
+-- Convert dname pointer to wireformat string
+local function dname2wire(name)
+ if name == nil then return nil end
+ return ffi.string(name, knot.knot_dname_size(name))
+end
+
+-- RR sets created in Lua must have a destructor to release allocated memory
+local function rrset_free(rr)
+ if rr._owner ~= nil then ffi.C.free(rr._owner) end
+ if rr:rdcount() > 0 then ffi.C.free(rr.rrs.rdata) end
+end
+
+-- Metatype for RR set. Beware, the indexing is 0-based (rdata, get, tostring).
+local rrset_buflen = (64 + 1) * 1024
+local rrset_buf = ffi.new('char[?]', rrset_buflen)
+local knot_rrset_pt = ffi.typeof('knot_rrset_t *')
+local knot_rrset_t = ffi.typeof('knot_rrset_t')
+ffi.metatype( knot_rrset_t, {
+ -- Create a new empty RR set object with an allocated owner and a destructor
+ __new = function (ct, owner, rrtype, rrclass, ttl)
+ local rr = ffi.new(ct)
+ C.kr_rrset_init(rr,
+ owner and knot.knot_dname_copy(owner, nil),
+ rrtype or 0,
+ rrclass or const_class.IN,
+ ttl or 0)
+ return ffi.gc(rr, rrset_free)
+ end,
+ -- BEWARE: `owner` and `rdata` are typed as a plain lua strings
+ -- and not the real types they represent.
+ __tostring = function(rr)
+ assert(ffi.istype(knot_rrset_t, rr))
+ return rr:txt_dump()
+ end,
+ __index = {
+ owner = function(rr)
+ assert(ffi.istype(knot_rrset_t, rr))
+ return dname2wire(rr._owner)
+ end,
+ ttl = function(rr)
+ assert(ffi.istype(knot_rrset_t, rr))
+ return tonumber(rr._ttl)
+ end,
+ class = function(rr, val)
+ assert(ffi.istype(knot_rrset_t, rr))
+ if val then
+ rr.rclass = val
+ end
+ return tonumber(rr.rclass)
+ end,
+ rdata_pt = function(rr, i)
+ assert(ffi.istype(knot_rrset_t, rr) and i >= 0 and i < rr:rdcount())
+ return knot.knot_rdataset_at(rr.rrs, i)
+ end,
+ rdata = function(rr, i)
+ assert(ffi.istype(knot_rrset_t, rr))
+ local rd = rr:rdata_pt(i)
+ return ffi.string(rd.data, rd.len)
+ end,
+ get = function(rr, i)
+ assert(ffi.istype(knot_rrset_t, rr) and i >= 0 and i < rr:rdcount())
+ return {owner = rr:owner(),
+ ttl = rr:ttl(),
+ class = tonumber(rr.rclass),
+ type = tonumber(rr.type),
+ rdata = rr:rdata(i)}
+ end,
+ tostring = function(rr, i)
+ assert(ffi.istype(knot_rrset_t, rr)
+ and (i == nil or (i >= 0 and i < rr:rdcount())) )
+ if rr:rdcount() > 0 then
+ local ret
+ if i ~= nil then
+ ret = knot.knot_rrset_txt_dump_data(rr, i, rrset_buf, rrset_buflen, knot.KNOT_DUMP_STYLE_DEFAULT)
+ else
+ ret = -1
+ end
+ return ret >= 0 and ffi.string(rrset_buf)
+ end
+ end,
+
+ -- Dump the rrset in presentation format (dig-like).
+ txt_dump = function(rr, style)
+ assert(ffi.istype(knot_rrset_t, rr))
+ local bufsize = 1024
+ local dump = ffi.new('char *[1]', C.malloc(bufsize))
+ -- ^ one pointer to a string
+ local size = ffi.new('size_t[1]', { bufsize }) -- one size_t = bufsize
+
+ local ret = knot.knot_rrset_txt_dump(rr, dump, size,
+ style or knot.KNOT_DUMP_STYLE_DEFAULT)
+ local result = nil
+ if ret >= 0 then
+ result = ffi.string(dump[0], ret)
+ end
+ C.free(dump[0])
+ return result
+ end,
+ txt_fields = function(rr, i)
+ assert(ffi.istype(knot_rrset_t, rr))
+ assert(i >= 0 and i < rr:rdcount())
+ local bufsize = 1024
+ local dump = ffi.new('char *', C.malloc(bufsize))
+ ffi.gc(dump, C.free)
+
+ local ret = knot.knot_rrset_txt_dump_data(rr, i, dump, 1024,
+ knot.KNOT_DUMP_STYLE_DEFAULT)
+ if ret >= 0 then
+ local out = {}
+ out.owner = dname2str(rr:owner())
+ out.ttl = rr:ttl()
+ out.class = kres.tostring.class[rr:class()]
+ out.type = kres.tostring.type[rr.type]
+ out.rdata = ffi.string(dump, ret)
+ return out
+ else
+ panic('knot_rrset_txt_dump_data failure ' .. tostring(ret))
+ end
+ end,
+ -- Return RDATA count for this RR set
+ rdcount = function(rr)
+ assert(ffi.istype(knot_rrset_t, rr))
+ return tonumber(rr.rrs.count)
+ end,
+ -- Add binary RDATA to the RR set
+ add_rdata = function (rr, rdata, rdlen, no_ttl)
+ assert(ffi.istype(knot_rrset_t, rr))
+ assert(no_ttl == nil, 'add_rdata() can not accept TTL anymore')
+ local ret = knot.knot_rrset_add_rdata(rr, rdata, tonumber(rdlen), nil)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ -- Merge data from another RR set into the current one
+ merge_rdata = function (rr, source)
+ assert(ffi.istype(knot_rrset_t, rr))
+ assert(ffi.istype(knot_rrset_t, source))
+ local ret = knot.knot_rdataset_merge(rr.rrs, source.rrs, nil)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ -- Return type covered by this RRSIG
+ type_covered = function(rr, i)
+ i = i or 0
+ assert(ffi.istype(knot_rrset_t, rr) and i >= 0 and i < rr:rdcount())
+ if rr.type ~= const_type.RRSIG then return end
+ return tonumber(C.kr_rrsig_type_covered(knot.knot_rdataset_at(rr.rrs, i)))
+ end,
+ -- Check whether a RRSIG is covering current RR set
+ is_covered_by = function(rr, rrsig)
+ assert(ffi.istype(knot_rrset_t, rr))
+ assert(ffi.istype(knot_rrset_t, rrsig))
+ assert(rrsig.type == const_type.RRSIG)
+ return (rr.type == rrsig:type_covered() and rr:owner() == rrsig:owner())
+ end,
+ -- Return RR set wire size
+ wire_size = function(rr)
+ assert(ffi.istype(knot_rrset_t, rr))
+ return tonumber(knot.knot_rrset_size(rr))
+ end,
+ },
+})
+
+-- Destructor for packet accepts pointer to pointer
+local knot_pkt_t = ffi.typeof('knot_pkt_t')
+
+-- Helpers for reading/writing 16-bit numbers from packet wire
+local function pkt_u16(pkt, off, val)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ptr = ffi.cast(u16_p, pkt.wire + off)
+ if val ~= nil then ptr[0] = htons(val) end
+ return (htons(ptr[0]))
+end
+
+-- Helpers for reading/writing message header flags
+local function pkt_bit(pkt, byteoff, bitmask, val)
+ -- If the value argument is passed, set/clear the desired bit
+ if val ~= nil then
+ if val then pkt.wire[byteoff] = bit.bor(pkt.wire[byteoff], bitmask)
+ else pkt.wire[byteoff] = bit.band(pkt.wire[byteoff], bit.bnot(bitmask)) end
+ return true
+ end
+ return (bit.band(pkt.wire[byteoff], bitmask) ~= 0)
+end
+
+local function knot_pkt_rr(section, i)
+ assert(section and ffi.istype('knot_pktsection_t', section)
+ and i >= 0 and i < section.count)
+ local ret = section.pkt.rr + section.pos + i
+ assert(ffi.istype(knot_rrset_pt, ret))
+ return ret
+end
+
+-- Metatype for packet
+ffi.metatype( knot_pkt_t, {
+ __new = function (_, size, wire)
+ if size < 12 or size > 65535 then
+ error('packet size must be <12, 65535>')
+ end
+
+ local pkt = knot.knot_pkt_new(nil, size, nil)
+ if pkt == nil then
+ error(string.format('failed to allocate a packet of size %d', size))
+ end
+ if wire == nil then
+ C.kr_rnd_buffered(pkt.wire, 2) -- randomize the query ID
+ else
+ assert(size <= #wire)
+ ffi.copy(pkt.wire, wire, size)
+ pkt.size = size
+ pkt.parsed = 0
+ end
+
+ return ffi.gc(pkt[0], knot.knot_pkt_free)
+ end,
+ __tostring = function(pkt)
+ return pkt:tostring()
+ end,
+ __len = function(pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ return tonumber(pkt.size)
+ end,
+ __ipairs = function(self)
+ return ipairs(self:section(const_section.ANSWER))
+ end,
+ __index = {
+ -- Header
+ id = function(pkt, val) return pkt_u16(pkt, 0, val) end,
+ qdcount = function(pkt, val) return pkt_u16(pkt, 4, val) end,
+ ancount = function(pkt, val) return pkt_u16(pkt, 6, val) end,
+ nscount = function(pkt, val) return pkt_u16(pkt, 8, val) end,
+ arcount = function(pkt, val) return pkt_u16(pkt, 10, val) end,
+ opcode = function (pkt, val)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ pkt.wire[2] = (val) and bit.bor(bit.band(pkt.wire[2], 0x78), 8 * val) or pkt.wire[2]
+ return (bit.band(pkt.wire[2], 0x78) / 8)
+ end,
+ rcode = function (pkt, val)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ pkt.wire[3] = (val) and bor(band(pkt.wire[3], 0xf0), val) or pkt.wire[3]
+ return band(pkt.wire[3], 0x0f)
+ end,
+ rd = function (pkt, val) return pkt_bit(pkt, 2, 0x01, val) end,
+ tc = function (pkt, val) return pkt_bit(pkt, 2, 0x02, val) end,
+ aa = function (pkt, val) return pkt_bit(pkt, 2, 0x04, val) end,
+ qr = function (pkt, val) return pkt_bit(pkt, 2, 0x80, val) end,
+ cd = function (pkt, val) return pkt_bit(pkt, 3, 0x10, val) end,
+ ad = function (pkt, val) return pkt_bit(pkt, 3, 0x20, val) end,
+ ra = function (pkt, val) return pkt_bit(pkt, 3, 0x80, val) end,
+ -- "do" is a reserved word in Lua; only getter
+ dobit = function(pkt, val)
+ assert(val == nil, 'dobit is getter only')
+ assert(ffi.istype(knot_pkt_t, pkt))
+ return C.kr_pkt_has_dnssec(pkt)
+ end,
+ -- Question
+ qname = function(pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ -- inlined knot_pkt_qname(), basically
+ if pkt == nil or pkt.qname_size == 0 then return nil end
+ return ffi.string(pkt.wire + 12, pkt.qname_size)
+ end,
+ qclass = function(pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ return C.kr_pkt_qclass(pkt)
+ end,
+ qtype = function(pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ return C.kr_pkt_qtype(pkt)
+ end,
+ rrsets = function (pkt, section_id)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local records = {}
+ local section = pkt.sections + section_id
+ for i = 1, section.count do
+ local rrset = knot_pkt_rr(section, i - 1)
+ table.insert(records, rrset)
+ end
+ return records
+ end,
+ section = function (pkt, section_id)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local records = {}
+ local section = pkt.sections + section_id
+ for i = 1, section.count do
+ local rrset = knot_pkt_rr(section, i - 1)
+ for k = 1, rrset:rdcount() do
+ table.insert(records, rrset:get(k - 1))
+ end
+ end
+ return records
+ end,
+ begin = function (pkt, section)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ assert(section >= pkt.current, 'cannot rewind to already written section')
+ assert(const_section_str[section], string.format('invalid section: %s', section))
+ local ret = knot.knot_pkt_begin(pkt, section)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ put = function (pkt, owner, ttl, rclass, rtype, rdata)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ret = C.kr_pkt_put(pkt, owner, ttl, rclass, rtype, rdata, #rdata)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ -- Put an RR set in the packet
+ -- Note: the packet doesn't take ownership of the RR set
+ put_rr = function (pkt, rr, rotate, flags)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ assert(ffi.istype(knot_rrset_t, rr))
+ local ret = C.knot_pkt_put_rotate(pkt, 0, rr, rotate or 0, flags or 0)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ recycle = function (pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ret = C.kr_pkt_recycle(pkt)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ clear_payload = function (pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ret = C.kr_pkt_clear_payload(pkt)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ question = function(pkt, qname, qclass, qtype)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ assert(qclass ~= nil, string.format('invalid class: %s', qclass))
+ assert(qtype ~= nil, string.format('invalid type: %s', qtype))
+ local ret = C.knot_pkt_put_question(pkt, qname, qclass, qtype)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ towire = function (pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ return ffi.string(pkt.wire, pkt.size)
+ end,
+ tostring = function(pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ return ffi.string(ffi.gc(C.kr_pkt_text(pkt), C.free))
+ end,
+ -- Return number of remaining empty bytes in the packet
+ -- This is generally useful to check if there's enough space
+ remaining_bytes = function (pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local occupied = pkt.size + pkt.reserved
+ assert(pkt.max_size >= occupied)
+ return tonumber(pkt.max_size - occupied)
+ end,
+ -- Packet manipulation
+ parse = function (pkt)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ret = knot.knot_pkt_parse(pkt, 0)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ -- Resize packet wire to a new size
+ resize = function (pkt, new_size)
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ptr = C.mm_realloc(pkt.mm, pkt.wire, new_size, pkt.max_size)
+ if ptr == nil then return end
+ pkt.wire = ptr
+ pkt.max_size = new_size
+ return true
+ end,
+ },
+})
+-- Metatype for query
+local kr_query_t = ffi.typeof('struct kr_query')
+ffi.metatype( kr_query_t, {
+ __index = {
+ -- Return query domain name
+ name = function(qry)
+ assert(ffi.istype(kr_query_t, qry))
+ return dname2wire(qry.sname)
+ end,
+ -- Write this query into packet
+ write = function(qry, pkt)
+ assert(ffi.istype(kr_query_t, qry))
+ assert(ffi.istype(knot_pkt_t, pkt))
+ local ret = C.kr_make_query(qry, pkt)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ },
+})
+
+-- helper for trace_chain_callbacks
+-- ignores return values from successfull calls but logs tracebacks for throws
+local function void_xpcall_log_tb(func, req, msg)
+ local ok, err = xpcall(func, debug.traceback, req, msg)
+ if not ok then
+ log('error: callback %s req %s msg %s stack traceback:\n%s', func, req, msg, err)
+ end
+end
+
+local function void_xpcall_finish_tb(func, req)
+ local ok, err = xpcall(func, debug.traceback, req)
+ if not ok then
+ log('error: callback %s req %s stack traceback:\n%s', func, req, err)
+ end
+end
+
+
+-- Metatype for request
+local kr_request_t = ffi.typeof('struct kr_request')
+ffi.metatype( kr_request_t, {
+ __index = {
+ -- makes sense only when request is finished
+ all_from_cache = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ local rplan = ffi.C.kr_resolve_plan(req)
+ if tonumber(rplan.pending.len) > 0 then
+ -- an unresolved query,
+ -- i.e. something is missing from the cache
+ return false
+ end
+ for idx=0, tonumber(rplan.resolved.len) - 1 do
+ if not rplan.resolved.at[idx].flags.CACHED then
+ return false
+ end
+ end
+ return true
+ end,
+ current = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ if req.current_query == nil then return nil end
+ return req.current_query
+ end,
+ -- returns the initial query that started the request
+ initial = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ local rplan = C.kr_resolve_plan(req)
+ if rplan.initial == nil then return nil end
+ return rplan.initial
+ end,
+ -- Return last query on the resolution plan
+ last = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ local query = C.kr_rplan_last(C.kr_resolve_plan(req))
+ if query == nil then return end
+ return query
+ end,
+ resolved = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ local qry = C.kr_rplan_resolved(C.kr_resolve_plan(req))
+ if qry == nil then return nil end
+ return qry
+ end,
+ -- returns first resolved sub query for a request
+ first_resolved = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ local rplan = C.kr_resolve_plan(req)
+ if not rplan or rplan.resolved.len < 1 then return nil end
+ return rplan.resolved.at[0]
+ end,
+ push = function(req, qname, qtype, qclass, flags, parent)
+ assert(ffi.istype(kr_request_t, req))
+ flags = kres.mk_qflags(flags) -- compatibility
+ local rplan = C.kr_resolve_plan(req)
+ local qry = C.kr_rplan_push(rplan, parent, qname, qclass, qtype)
+ if qry ~= nil and flags ~= nil then
+ C.kr_qflags_set(qry.flags, flags)
+ end
+ return qry
+ end,
+ pop = function(req, qry)
+ assert(ffi.istype(kr_request_t, req))
+ return C.kr_rplan_pop(C.kr_resolve_plan(req), qry)
+ end,
+ selected_tostring = function(req)
+ assert(ffi.istype(kr_request_t, req))
+ local buf = {}
+ if #req.answ_selected ~= 0 then
+ table.insert(buf, string.format('[%05d.00][dbg ] selected rrsets from answer sections:\n', req.uid))
+ table.insert(buf, tostring(req.answ_selected))
+ end
+ if #req.auth_selected ~= 0 then
+ table.insert(buf, string.format('[%05d.00][dbg ] selected rrsets from authority sections:\n', req.uid))
+ table.insert(buf, tostring(req.auth_selected))
+ end
+ if #req.add_selected ~= 0 then
+ table.insert(buf, string.format('[%05d.00][dbg ] selected rrsets from additional sections:\n', req.uid))
+ table.insert(buf, tostring(req.add_selected))
+ end
+ return table.concat(buf, '')
+ end,
+
+ -- chain new callbacks after the old ones
+ -- creates new wrapper functions as necessary
+ -- note: callbacks are FFI cdata pointers so tests must
+ -- use explicit "cb == nil", just "if cb" does not work
+ --
+ trace_chain_callbacks = function (req, new_log, new_finish)
+ local log_wrapper
+ if req.trace_log == nil then
+ req.trace_log = new_log
+ else
+ local old_log = req.trace_log
+ log_wrapper = ffi.cast('trace_log_f',
+ function(cbreq, msg)
+ jit.off(true, true) -- JIT for (C -> lua)^2 nesting isn't allowed
+ void_xpcall_log_tb(old_log, cbreq, msg)
+ void_xpcall_log_tb(new_log, cbreq, msg)
+ end)
+ req.trace_log = log_wrapper
+ end
+ local old_finish = req.trace_finish
+ if not (log_wrapper ~= nil or old_finish ~= nil) then
+ req.trace_finish = new_finish
+ else
+ local fin_wrapper
+ fin_wrapper = ffi.cast('trace_callback_f',
+ function(cbreq)
+ jit.off(true, true) -- JIT for (C -> lua)^2 nesting isn't allowed
+ if old_finish ~= nil then
+ void_xpcall_finish_tb(old_finish, cbreq)
+ end
+ if new_finish ~= nil then
+ void_xpcall_finish_tb(new_finish, cbreq)
+ end
+ -- beware: finish callbacks can call log callback
+ if log_wrapper ~= nil then
+ log_wrapper:free()
+ end
+ fin_wrapper:free()
+ end)
+ req.trace_finish = fin_wrapper
+ end
+ end,
+
+ -- Return per-request variable table
+ -- The request can store anything in this Lua table and it will be freed
+ -- when the request is closed, it doesn't have to worry about contents.
+ vars = function (req)
+ assert(ffi.istype(kr_request_t, req))
+ -- Return variable if it's already stored
+ local var = worker.vars[req.vars_ref]
+ if var then
+ return var
+ end
+ -- Either take a slot number from freelist
+ -- or find a first free slot (expand the table)
+ local ref = worker.vars[0]
+ if ref then
+ worker.vars[0] = worker.vars[ref]
+ else
+ ref = #worker.vars + 1
+ end
+ -- Create new variables table
+ var = {}
+ worker.vars[ref] = var
+ -- Save reference in the request
+ req.vars_ref = ref
+ return var
+ end,
+ -- Ensure that answer exists and return it; can't fail.
+ ensure_answer = function (req)
+ assert(ffi.istype(kr_request_t, req))
+ return C.kr_request_ensure_answer(req)
+ end,
+ },
+})
+
+-- C array iterator
+local function c_array_iter(t, i)
+ i = i + 1
+ if i >= t.len then return end
+ return i, t.at[i][0]
+end
+
+-- Metatype for a single ranked record array entry (one RRset)
+local function rank_tostring(rank)
+ local names = {}
+ for name, value in pairs(const_rank) do
+ if ffi.C.kr_rank_test(rank, value) then
+ table.insert(names, string.lower(name))
+ end
+ end
+ return string.format('0%.2o (%s)', rank, table.concat(names, ' '))
+end
+
+local ranked_rr_array_entry_t = ffi.typeof('ranked_rr_array_entry_t')
+ffi.metatype(ranked_rr_array_entry_t, {
+ __tostring = function(self)
+ return string.format('; ranked rrset to_wire %s, rank %s, cached %s, qry_uid %s, revalidations %s\n%s',
+ self.to_wire, rank_tostring(self.rank), self.cached, self.qry_uid,
+ self.revalidation_cnt, string.format('%s', self.rr))
+ end
+})
+
+-- Metatype for ranked record array (array of RRsets)
+local ranked_rr_array_t = ffi.typeof('ranked_rr_array_t')
+ffi.metatype(ranked_rr_array_t, {
+ __len = function(self)
+ return tonumber(self.len)
+ end,
+ __ipairs = function (self)
+ return c_array_iter, self, -1
+ end,
+ __index = {
+ get = function (self, i)
+ if i < 0 or i > self.len then return nil end
+ return self.at[i][0]
+ end,
+ },
+ __tostring = function(self)
+ local buf = {}
+ for _, rrset in ipairs(self) do
+ table.insert(buf, tostring(rrset))
+ end
+ return table.concat(buf, '')
+ end
+})
+
+-- Cache metatype
+local kr_cache_t = ffi.typeof('struct kr_cache')
+ffi.metatype( kr_cache_t, {
+ __index = {
+ insert = function (self, rr, rrsig, rank, timestamp)
+ assert(ffi.istype(kr_cache_t, self))
+ assert(ffi.istype(knot_rrset_t, rr), 'RR must be a rrset type')
+ assert(not rrsig or ffi.istype(knot_rrset_t, rrsig), 'RRSIG must be nil or of the rrset type')
+ -- Get current timestamp
+ if not timestamp then
+ local now = timeval_t()
+ C.gettimeofday(now, nil)
+ timestamp = tonumber(now.tv_sec)
+ end
+ -- Insert record into cache
+ local ret = C.kr_cache_insert_rr(self, rr, rrsig, tonumber(rank or 0), timestamp)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ commit = function (self)
+ assert(ffi.istype(kr_cache_t, self))
+ local ret = C.kr_cache_commit(self)
+ if ret ~= 0 then return nil, knot_error_t(ret) end
+ return true
+ end,
+ },
+})
+
+-- Pretty-print a single RR (which is a table with .owner .ttl .type .rdata)
+-- Extension: append .comment if exists.
+local function rr2str(rr, style)
+ -- Construct a single-RR temporary set while minimizing copying.
+ local ret
+ do
+ local rrs = knot_rrset_t(rr.owner, rr.type, kres.class.IN, rr.ttl)
+ rrs:add_rdata(rr.rdata, #rr.rdata)
+ ret = rrs:txt_dump(style)
+ end
+
+ -- Trim the newline and append comment (optionally).
+ if ret then
+ if ret:byte(-1) == string.byte('\n', -1) then
+ ret = ret:sub(1, -2)
+ end
+ if rr.comment then
+ ret = ret .. ' ;' .. rr.comment
+ end
+ end
+ return ret
+end
+
+-- Module API
+kres = {
+ -- Constants
+ class = const_class,
+ type = const_type,
+ section = const_section,
+ rcode = const_rcode,
+ opcode = const_opcode,
+ rank = const_rank,
+
+ -- Constants to strings
+ tostring = {
+ class = const_class_str,
+ type = const_type_str,
+ section = const_section_str,
+ rcode = const_rcode_str,
+ opcode = const_opcode_str,
+ rank = const_rank_str,
+ },
+
+ -- Create a struct kr_qflags from a single flag name or a list of names.
+ mk_qflags = function (names)
+ local kr_qflags = ffi.typeof('struct kr_qflags')
+ if names == 0 or names == nil then -- compatibility: nil is common in lua
+ names = {}
+ elseif type(names) == 'string' then
+ names = {names}
+ elseif ffi.istype(kr_qflags, names) then
+ return names
+ end
+
+ local fs = ffi.new(kr_qflags)
+ for _, name in pairs(names) do
+ fs[name] = true
+ end
+ return fs
+ end,
+
+ CONSUME = 1, PRODUCE = 2, DONE = 4, FAIL = 8, YIELD = 16,
+
+ -- Export types
+ rrset = knot_rrset_t,
+ packet = knot_pkt_t,
+ lru = function (max_size, value_type)
+ value_type = value_type or ffi.typeof('uint64_t')
+ local ct = ffi.typeof(typed_lru_t, value_type)
+ return ffi.metatype(ct, lru_metatype)(max_size, ffi.alignof(value_type))
+ end,
+
+ -- Metatypes. Beware that any pointer will be cast silently...
+ pkt_t = function (udata) return ffi.cast('knot_pkt_t *', udata) end,
+ request_t = function (udata) return ffi.cast('struct kr_request *', udata) end,
+ sockaddr_t = function (udata) return ffi.cast('struct sockaddr *', udata) end,
+
+ -- Global API functions
+ -- Convert a lua string to a lower-case wire format (inside GC-ed ffi.string).
+ str2dname = function(name)
+ if type(name) ~= 'string' then return end
+ local dname = ffi.gc(C.knot_dname_from_str(nil, name, 0), C.free)
+ if dname == nil then return nil end
+ ffi.C.knot_dname_to_lower(dname);
+ return dname2wire(dname)
+ end,
+ dname2str = dname2str,
+ dname2wire = dname2wire,
+
+ rr2str = rr2str,
+ str2ip = function (ip)
+ local family = C.kr_straddr_family(ip)
+ local ret = C.inet_pton(family, ip, addr_buf)
+ if ret ~= 1 then return nil end
+ return ffi.string(addr_buf, C.kr_family_len(family))
+ end,
+ context = function () return ffi.C.the_worker.engine.resolver end,
+
+ knot_pkt_rr = knot_pkt_rr,
+}
+
+return kres
diff --git a/daemon/lua/krprint.lua b/daemon/lua/krprint.lua
new file mode 100644
index 0000000..2438033
--- /dev/null
+++ b/daemon/lua/krprint.lua
@@ -0,0 +1,340 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+local base_class = {
+ cur_indent = 0,
+}
+
+-- shared constructor: use as serializer_class:new()
+function base_class.new(class, on_unrepresentable)
+ on_unrepresentable = on_unrepresentable or 'comment'
+ if on_unrepresentable ~= 'comment'
+ and on_unrepresentable ~= 'error' then
+ error('unsupported val2expr on_unrepresentable option '
+ .. tostring(on_unrepresentable))
+ end
+ local inst = {}
+ inst.on_unrepresentable = on_unrepresentable
+ inst.done = {}
+ inst.tab_key_path = {}
+ setmetatable(inst, class.__inst_mt)
+ return inst
+end
+
+-- format comment with leading/ending whitespace if needed
+function base_class.format_note(_, note, ws_prefix, ws_suffix)
+ if note == nil then
+ return ''
+ else
+ return string.format('%s--[[ %s ]]%s',
+ ws_prefix or '', note, ws_suffix or '')
+ end
+end
+
+function base_class.indent_head(self)
+ return string.rep(' ', self.cur_indent)
+end
+
+function base_class.indent_inc(self)
+ self.cur_indent = self.cur_indent + self.indent_step
+end
+
+function base_class.indent_dec(self)
+ self.cur_indent = self.cur_indent - self.indent_step
+end
+
+function base_class._fallback(self, val)
+ if self.on_unrepresentable == 'comment' then
+ return 'nil', string.format('missing %s', val)
+ elseif self.on_unrepresentable == 'error' then
+ local key_path_msg
+ if #self.tab_key_path > 0 then
+ local str_key_path = {}
+ for _, key in ipairs(self.tab_key_path) do
+ table.insert(str_key_path,
+ string.format('%s %s', type(key), self:string(tostring(key))))
+ end
+ local key_path = '[' .. table.concat(str_key_path, '][') .. ']'
+ key_path_msg = string.format(' (found at [%s])', key_path)
+ else
+ key_path_msg = ''
+ end
+ error(string.format('cannot serialize type %s%s', type(val), key_path_msg), 2)
+ end
+end
+
+function base_class.val2expr(self, val)
+ local val_type = type(val)
+ local val_repr = self[val_type]
+ if val_repr then
+ return val_repr(self, val)
+ else
+ return self:_fallback(val)
+ end
+end
+
+-- "nil" is a Lua keyword so assignment below is workaround to create
+-- function base_class.nil(self, val)
+base_class['nil'] = function(_, val)
+ assert(type(val) == 'nil')
+ return 'nil'
+end
+
+function base_class.number(_, val)
+ assert(type(val) == 'number')
+ if val == math.huge then
+ return 'math.huge'
+ elseif val == -math.huge then
+ return '-math.huge'
+ elseif tostring(val) == 'nan' then
+ return 'tonumber(\'nan\')'
+ else
+ return string.format("%.60f", val)
+ end
+end
+
+function base_class.char_is_printable(_, c)
+ -- ASCII (from space to ~) and not ' or \
+ return (c >= 0x20 and c < 0x7f)
+ and c ~= 0x27 and c ~= 0x5C
+end
+
+function base_class.string(self, val)
+ assert(type(val) == 'string')
+ local chars = {'\''}
+ for i = 1, #val do
+ local c = string.byte(val, i)
+ if self:char_is_printable(c) then
+ table.insert(chars, string.char(c))
+ else
+ table.insert(chars, string.format('\\%03d', c))
+ end
+ end
+ table.insert(chars, '\'')
+ return table.concat(chars)
+end
+
+function base_class.boolean(_, val)
+ assert(type(val) == 'boolean')
+ return tostring(val)
+end
+
+local function ordered_iter(unordered_tt)
+ local keys = {}
+ for k in pairs(unordered_tt) do
+ table.insert(keys, k)
+ end
+ table.sort(keys,
+ function (a, b)
+ if type(a) ~= type(b) then
+ return type(a) < type(b)
+ end
+ if type(a) == 'number' then
+ return a < b
+ else
+ return tostring(a) < tostring(b)
+ end
+ end)
+ local i = 0
+ return function()
+ i = i + 1
+ if keys[i] ~= nil then
+ return keys[i], unordered_tt[keys[i]]
+ end
+ end
+end
+
+function base_class.table(self, tab)
+ assert(type(tab) == 'table')
+ if self.done[tab] then
+ error('cyclic reference', 0)
+ end
+ self.done[tab] = true
+
+ local items = {'{'}
+ local previdx = 0
+ self:indent_inc()
+ for idx, val in ordered_iter(tab) do
+ local errors, valok, valexpr, valnote, idxok, idxexpr, idxnote
+ errors = {}
+ -- push current index onto key path stack to make it available to sub-printers
+ table.insert(self.tab_key_path, idx)
+
+ valok, valexpr, valnote = pcall(self.val2expr, self, val)
+ if not valok then
+ table.insert(errors, string.format('value: %s', valexpr))
+ end
+
+ local addidx
+ if previdx and type(idx) == 'number' and idx - 1 == previdx then
+ -- monotonic sequence, do not print key
+ previdx = idx
+ addidx = false
+ else
+ -- end of monotonic sequence
+ -- from now on print keys as well
+ previdx = nil
+ addidx = true
+ end
+
+ if addidx then
+ idxok, idxexpr, idxnote = pcall(self.val2expr, self, idx)
+ if not idxok or idxexpr == 'nil' then
+ table.insert(errors, string.format('key: not serializable', idxexpr))
+ end
+ end
+
+ local item = ''
+ if #errors == 0 then
+ -- finally serialize one [key=]?value expression
+ local indent = self:indent_head()
+ local note
+ if addidx then
+ note = self:format_note(idxnote, nil, self.key_val_sep)
+ item = string.format('%s%s[%s]%s=%s',
+ indent, note,
+ idxexpr, self.key_val_sep, self.key_val_sep)
+ indent = ''
+ end
+ note = self:format_note(valnote, nil, self.item_sep)
+ item = item .. string.format('%s%s%s,', indent, note, valexpr)
+ else
+ local errmsg = string.format('cannot print %s = %s (%s)',
+ self:string(tostring(idx)),
+ self:string(tostring(val)),
+ table.concat(errors, ', '))
+ if self.on_unrepresentable == 'error' then
+ error(errmsg, 0)
+ else
+ errmsg = string.format('--[[ missing %s ]]', errmsg)
+ item = errmsg
+ end
+ end
+ table.insert(items, item)
+ table.remove(self.tab_key_path) -- pop current index from key path stack
+ end -- one key+value
+ self:indent_dec()
+ table.insert(items, self:indent_head() .. '}')
+ return table.concat(items, self.item_sep), string.format('%s follows', tab)
+end
+
+-- machine readable variant, cannot represent all types and repeated references to a table
+local serializer_class = {
+ indent_step = 0,
+ item_sep = ' ',
+ key_val_sep = ' ',
+ __inst_mt = {}
+}
+-- inhertance form base class (for :new())
+setmetatable(serializer_class, { __index = base_class })
+-- class instances with following metatable inherit all class members
+serializer_class.__inst_mt.__index = serializer_class
+
+local function static_serializer(val, on_unrepresentable)
+ local inst = serializer_class:new(on_unrepresentable)
+ local expr, note = inst:val2expr(val)
+ return string.format('%s%s', inst:format_note(note, nil, inst.item_sep), expr)
+ end
+
+-- human friendly variant, not stable and not intended for machine consumption
+local pprinter_class = {
+ indent_step = 4,
+ item_sep = '\n',
+ key_val_sep = ' ',
+ __inst_mt = {},
+}
+
+-- should be always empty because pretty-printer has fallback for all types
+function pprinter_class.format_note()
+ return ''
+end
+
+function pprinter_class._fallback(self, val)
+ if self.on_unrepresentable == 'error' then
+ base_class._fallback(self, val)
+ end
+ return tostring(val)
+end
+
+function pprinter_class.char_is_printable(_, c)
+ -- ASCII (from space to ~) + tab or newline
+ -- and not ' or \
+ return ((c >= 0x20 and c < 0x7f)
+ or c == 0x09 or c == 0x0A)
+ and c ~= 0x27 and c ~= 0x5C
+end
+
+-- "function" is a Lua keyword so assignment below is workaround to create
+-- function pprinter_class.function(self, f)
+pprinter_class['function'] = function(self, f)
+-- thanks to AnandA777 from StackOverflow! Function funcsign is adapted version of
+-- https://stackoverflow.com/questions/51095022/inspect-function-signature-in-lua-5-1
+ assert(type(f) == 'function', "bad argument #1 to 'funcsign' (function expected)")
+ local debuginfo = debug.getinfo(f)
+ local func_args = {}
+ local args_str
+ if debuginfo.what == 'C' then -- names N/A
+ args_str = '(?)'
+ goto add_name
+ end
+
+ pcall(function()
+ local oldhook
+ local delay = 2
+ local function hook()
+ delay = delay - 1
+ if delay == 0 then -- call this only for the introspected function
+ -- stack depth 2 is the introspected function
+ for i = 1, debuginfo.nparams do
+ local k = debug.getlocal(2, i)
+ table.insert(func_args, k)
+ end
+ if debuginfo.isvararg then
+ table.insert(func_args, "...")
+ end
+ debug.sethook(oldhook)
+ error('aborting the call to introspected function')
+ end
+ end
+ oldhook = debug.sethook(hook, "c") -- invoke hook() on function call
+ f(unpack({})) -- huh?
+ end)
+ args_str = "(" .. table.concat(func_args, ", ") .. ")"
+ ::add_name::
+ local name
+ if #self.tab_key_path > 0 then
+ name = string.format('function %s', self.tab_key_path[#self.tab_key_path])
+ else
+ name = 'function '
+ end
+ return string.format('%s%s: %s', name, args_str, string.sub(tostring(f), 11))
+end
+
+-- default tostring method is better suited for human-intended output
+function pprinter_class.number(_, number)
+ return tostring(number)
+end
+
+local function deserialize_lua(serial)
+ assert(type(serial) == 'string')
+ local deserial_func = loadstring('return ' .. serial)
+ if type(deserial_func) ~= 'function' then
+ panic('input is not a valid Lua expression')
+ end
+ return deserial_func()
+end
+
+setmetatable(pprinter_class, { __index = base_class })
+pprinter_class.__inst_mt.__index = pprinter_class
+
+local function static_pprint(val, on_unrepresentable)
+ local inst = pprinter_class:new(on_unrepresentable)
+ local expr, note = inst:val2expr(val)
+ return string.format('%s%s', inst:format_note(note, nil, inst.item_sep), expr)
+end
+
+local M = {
+ serialize_lua = static_serializer,
+ deserialize_lua = deserialize_lua,
+ pprint = static_pprint
+}
+
+return M
diff --git a/daemon/lua/krprint.test.lua b/daemon/lua/krprint.test.lua
new file mode 100644
index 0000000..9218052
--- /dev/null
+++ b/daemon/lua/krprint.test.lua
@@ -0,0 +1,292 @@
+local serialize_lua = require('krprint').serialize_lua
+local deserialize_lua = require('krprint').deserialize_lua
+
+local function gen_string(maxlen)
+ maxlen = maxlen or 100
+ local len = math.random(0, maxlen)
+ local buf = {}
+ for _=1,len do
+ table.insert(buf, string.char(math.random(0, 255)))
+ end
+ return table.concat(buf)
+end
+
+local function test_de_serialization(orig_val, desc)
+ local serial = serialize_lua(orig_val)
+ ok(type(serial) == 'string' and #serial > 0,
+ 'serialization returns non-empty string: ' .. desc)
+ local deserial_val = deserialize_lua(serial)
+ same(type(orig_val), type(deserial_val),
+ 'deserialized value has the same type: ' .. desc)
+ if type(orig_val) == 'number' then
+ -- nan cannot be compared using == operator
+ if tostring(orig_val) == 'nan' and tostring(deserial_val) == 'nan' then
+ pass('nan value serialized and deserialized')
+ elseif orig_val ~= math.huge and orig_val ~= -math.huge then
+ -- tolerance measured experimentally on x86_64 LuaJIT 2.1.0-beta3
+ local tolerance = 1e-14
+ ok(math.abs(orig_val - deserial_val) <= tolerance,
+ 'deserialized number is within tolerance ' .. tolerance)
+ else
+ same(orig_val, deserial_val, 'deserialization returns the same infinity:' .. desc)
+ end
+ else
+ same(orig_val, deserial_val,
+ 'deserialization returns the same value: ' .. desc)
+ end
+end
+
+local function test_de_serialization_autodesc(orig_val)
+ test_de_serialization(orig_val, tostring(orig_val))
+end
+
+local function test_bool()
+ test_de_serialization_autodesc(true)
+ same('true', table_print(true), 'table_print handles true')
+ test_de_serialization_autodesc(false)
+ same('false', table_print(false), 'table_print handles false')
+end
+
+local function test_nil()
+ test_de_serialization_autodesc(nil)
+ same('nil', table_print(nil), 'table_print handles nil')
+end
+
+local function gen_number_int()
+ local number
+ -- make "small" numbers more likely so they actually happen
+ if math.random() < 0.5 then
+ number = math.random(-2^32, 2^32)
+ else
+ number = math.random(-2^48, 2^48)
+ end
+ return number
+end
+
+local function gen_number_float()
+ return math.random()
+end
+
+local function test_number()
+ test_de_serialization_autodesc(0)
+ same('0', table_print(0), 'table_print handles 0')
+ test_de_serialization_autodesc(-math.huge)
+ same('-inf', table_print(-math.huge), 'table_print handles -infinity')
+ test_de_serialization_autodesc(math.huge)
+ same('inf', table_print(math.huge), 'table_print handles +infinity')
+ test_de_serialization_autodesc(tonumber('nan'))
+ same('nan', table_print(tonumber('nan')), 'table_print handles nan')
+ for _=1,20 do -- integers
+ test_de_serialization_autodesc(gen_number_int())
+ -- bigger numbers might end up with non-exact representation
+ local smallnumber = math.random(-2^32, 2^32)
+ same(tostring(smallnumber), table_print(smallnumber),
+ 'table_print handles small numbers')
+ end
+ for _=1,20 do -- floats
+ local float = math.random()
+ same(tostring(float), table_print(float),
+ 'table_print handles floats')
+ test_de_serialization_autodesc(gen_number_float())
+ end
+end
+
+local function test_string()
+ test_de_serialization('', 'empty string')
+ for _=1,20 do
+ local str = gen_string(1024*10)
+ test_de_serialization(str, 'random string length ' .. #str)
+ end
+end
+
+local function gen_number()
+ -- pure random would not produce special cases often enough
+ local generators = {
+ function() return 0 end,
+ function() return -math.huge end,
+ function() return math.huge end,
+ gen_number_int,
+ gen_number_float,
+ }
+ return generators[math.random(1, #generators)]()
+end
+
+local function gen_boolean()
+ local options = {true, false}
+ return options[math.random(1, #options)]
+end
+
+local function gen_table_atomic()
+ -- nil keys or values are not allowed
+ -- nested tables are handled elsewhere
+ local supported_types = {
+ gen_number,
+ gen_string,
+ gen_boolean,
+ }
+ val = supported_types[math.random(1, #supported_types)]()
+ return val
+end
+
+local function gen_test_tables_supported(level)
+ level = level or 1
+ local max_level = 5
+ local max_items_per_table = 20
+ local t = {}
+ for _=1, math.random(0, max_items_per_table) do
+ local val_as_table = (level <= max_level) and math.random() < 0.1
+ local key, val
+ -- tapered.same method cannot compare keys with type table
+ key = gen_table_atomic()
+ if val_as_table then
+ val = gen_test_tables_supported(level + 1)
+ else
+ val = gen_table_atomic()
+ end
+ t[key] = val
+ end
+ return t
+end
+
+local marker = 'this string must be present somewhere in output'
+local function gen_marker()
+ return marker
+end
+
+local kluautil = require('kluautil')
+local function random_modify_table(t, always, generator)
+ assert(generator)
+ local tab_len = kluautil.kr_table_len(t)
+ local modified = false
+ -- modify some values
+ for key, val in pairs(t) do
+ if math.random(1, tab_len) == 1 then
+ if type(val) == 'table' then
+ modified = modified or random_modify_table(val, false, generator)
+ else
+ t[key] = generator()
+ modified = true
+ end
+ end
+ end
+ if always and not modified then
+ -- fallback, add an unsupported key
+ t[generator()] = true
+ modified = true
+ end
+ return modified
+end
+
+local function test_table_supported()
+ for i=1,10 do
+ local t = gen_test_tables_supported()
+ test_de_serialization(t, 'random table no. ' .. i)
+ assert(random_modify_table(t, true, gen_marker))
+ local str = table_print(t)
+ ok(string.find(str, marker, 1, true),
+ 'table_print works on complex serializable tables')
+ end
+end
+
+local ffi = require('ffi')
+local const_func = tostring
+local const_thread = coroutine.create(tostring)
+local const_userdata = ffi.C
+local const_cdata = ffi.new('int')
+
+local function gen_unsupported_atomic()
+ -- nested tables are handled elsewhere
+ local unsupported_types = {
+ const_func,
+ const_thread,
+ const_userdata,
+ const_cdata
+ }
+ val = unsupported_types[math.random(1, #unsupported_types)]
+ return val
+end
+
+local function test_unsupported(val, desc)
+ desc = desc or string.format('unsupported %s', type(val))
+ return function()
+ boom(serialize_lua, { val, 'error' }, string.format(
+ 'attempt to serialize %s in error mode '
+ .. 'causes error', desc))
+ local output = serialize_lua(val, 'comment')
+ same('string', type(output),
+ string.format('attempt to serialize %s in '
+ .. 'comment mode returned a string',
+ desc))
+ ok(string.find(output, '--', 1, true),
+ 'returned string contains a comment')
+ output = table_print(val)
+ same('string', type(output),
+ string.format('table_print can stringify %s', desc))
+ if type(val) ~= 'table' then
+ ok(string.find(output, type(val), 1, true),
+ 'exotic type is mentioned in table_print output')
+ end
+ end
+end
+
+local function gen_test_tables_unsupported()
+ local t = gen_test_tables_supported()
+ random_modify_table(t, true, gen_unsupported_atomic)
+ return t
+end
+
+local function test_unsupported_table()
+ for i=1,10 do
+ local t = gen_test_tables_unsupported()
+ test_unsupported(t, 'random unsupported table no. ' .. i)()
+ assert(random_modify_table(t, true, gen_marker))
+ local str = table_print(t)
+ ok(string.find(str, marker, 1, true),
+ 'table_print works on complex unserializable tables')
+ end
+end
+
+local function func_2vararg_5ret(arg1, arg2, ...)
+ return select('#', ...), nil, arg1 + arg2, false, nil
+end
+local function func_ret_nil() return nil end
+local function func_ret_nothing() return end
+
+local function test_pprint_func()
+ local t = { [false] = func_2vararg_5ret }
+ local output = table_print(t)
+ ok(string.find(output, 'function false(arg1, arg2, ...)', 1, true),
+ 'function parameters are pretty printed')
+end
+
+local function test_pprint_func_ret()
+ local output = table_print(func_2vararg_5ret(1, 2, 'bla'))
+ local exp = [[
+1 -- result # 1
+nil -- result # 2
+3 -- result # 3
+false -- result # 4
+nil -- result # 5]]
+ same(output, exp, 'multiple return values are pretty printed')
+
+ output = table_print(func_ret_nil())
+ same(output, 'nil', 'single return value does not have extra comments')
+
+ output = table_print(func_ret_nothing())
+ same(output, nil, 'no return values to be printed cause nil output')
+end
+
+return {
+ test_bool,
+ test_nil,
+ test_number,
+ test_string,
+ test_table_supported,
+ test_unsupported(const_func),
+ test_unsupported(const_thread),
+ test_unsupported(const_userdata),
+ test_unsupported(const_cdata),
+ test_unsupported_table,
+ test_pprint_func,
+ test_pprint_func_ret,
+}
diff --git a/daemon/lua/map.test.integr/deckard.yaml b/daemon/lua/map.test.integr/deckard.yaml
new file mode 100644
index 0000000..2fe920d
--- /dev/null
+++ b/daemon/lua/map.test.integr/deckard.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+programs:
+- name: kresd3
+ binary: kresd
+ additional:
+ - --noninteractive
+ templates:
+ - daemon/lua/map.test.integr/kresd_config.j2
+ - tests/integration/hints_zone.j2
+ - tests/config/tapered/src/tapered.lua
+ configs:
+ - config
+ - hints
+ - tapered.lua
+- name: kresd2
+ binary: kresd
+ additional:
+ - --noninteractive
+ templates:
+ - daemon/lua/map.test.integr/kresd_config.j2
+ - tests/integration/hints_zone.j2
+ - tests/config/tapered/src/tapered.lua
+ configs:
+ - config
+ - hints
+ - tapered.lua
+- name: kresd1
+ binary: kresd
+ additional:
+ - --noninteractive
+ templates:
+ - daemon/lua/map.test.integr/kresd_config.j2
+ - tests/integration/hints_zone.j2
+ - tests/config/tapered/src/tapered.lua
+ configs:
+ - config
+ - hints
+ - tapered.lua
diff --git a/daemon/lua/map.test.integr/kresd_config.j2 b/daemon/lua/map.test.integr/kresd_config.j2
new file mode 100644
index 0000000..baa92b3
--- /dev/null
+++ b/daemon/lua/map.test.integr/kresd_config.j2
@@ -0,0 +1,192 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+log('my PID = %d', worker.pid)
+
+trust_anchors.remove('.')
+
+cache.size = 2*MB
+
+net = { '{{SELF_ADDR}}' }
+
+{% if QMIN == "false" %}
+option('NO_MINIMIZE', true)
+{% else %}
+option('NO_MINIMIZE', false)
+{% endif %}
+
+-- Self-checks on globals
+assert(help() ~= nil)
+assert(worker.id ~= nil)
+-- Self-checks on facilities
+assert(cache.count() == 0)
+assert(cache.stats() ~= nil)
+assert(cache.backends() ~= nil)
+assert(worker.stats() ~= nil)
+assert(net.interfaces() ~= nil)
+-- Self-checks on loaded stuff
+assert(#modules.list() > 0)
+-- Self-check timers
+ev = event.recurrent(1 * sec, function (ev) return 1 end)
+event.cancel(ev)
+
+local kluautil = require('kluautil')
+local tap = require('tapered')
+local checks_total = 16
+local n_instances = 3 -- must match deckard.yaml
+
+worker.control_path = worker.cwd .. '/../kresd3/control/'
+net.listen(worker.control_path .. worker.pid, nil, {kind = 'control'})
+assert(#net.list() >= 3) -- UDP, TCP, control
+
+-- debug, kept for future use
+--log('%s', worker.control_path)
+--log('%s', table_print(net.list()))
+
+function wait_for_sockets()
+ log('waiting for control sockets')
+ local ffi = require('ffi')
+ local timeout = 5000 -- ms
+ local start_time = tonumber(ffi.C.kr_now())
+ local now
+ while true do
+ now = tonumber(ffi.C.kr_now())
+ if now > start_time + timeout then
+ log('timeout while waiting for control sockets to appear')
+ os.exit(3)
+ end
+ local pids = kluautil.list_dir(worker.control_path)
+ if #pids == n_instances then
+ -- debug, kept for future use
+ --log('got control sockets:')
+ --log(table_print(pids))
+ break
+ else
+ worker.sleep(0.1)
+ end
+ end
+ log('PIDs are visible now (waiting took %d ms)', now - start_time)
+end
+
+-- expression should throw Lua error:
+-- wrap it in a function which runs the expression on leader and follower
+-- separately so we can guarantee both cases are covered
+function boom_follower_and_leader(boom_expr, desc)
+ local variants = {leader = '~=', follower = '=='}
+ for name, operator in pairs(variants) do
+ -- beware, newline is not allowed in expr
+ local full_expr = string.format(
+ 'if (worker.pid %s %s) then return true '
+ .. 'else return %s end',
+ operator, worker.pid, boom_expr)
+ local full_desc = name .. ': '
+ if desc then
+ full_desc = full_desc .. desc .. ' (' .. boom_expr .. ')'
+ else
+ full_desc = full_desc .. boom_expr
+ end
+ tap.boom(map, {full_expr}, full_desc)
+ end
+end
+
+function tests()
+ -- add delay to each test to force scheduler to interleave tests and DNS queries
+ local test_delay = 20 / 1000 -- seconds
+ log('starting map() tests now')
+
+ tap.boom(map, {'1 ++ 1'}, 'syntax error in command is detected')
+ worker.sleep(test_delay)
+
+ -- array of integers
+ local pids = map('worker.pid')
+ tap.same(pids.n, n_instances, 'all pids were obtained')
+ table.sort(pids)
+ worker.sleep(test_delay)
+
+ -- expression produces array of integers
+ local pids_plus_one = map('worker.pid + 1')
+ tap.same(pids_plus_one.n, n_instances, 'all pids were obtained')
+ table.sort(pids_plus_one)
+ for idx=1,n_instances do
+ tap.same(pids[idx] + 1, pids_plus_one[idx],
+ 'increment expression worked')
+ end
+ worker.sleep(test_delay)
+
+ -- error detection
+ boom_follower_and_leader('error("explosion")')
+ worker.sleep(test_delay)
+
+ -- unsupported number of return values
+ boom_follower_and_leader('1, 2')
+ worker.sleep(test_delay)
+ boom_follower_and_leader('unpack({})')
+ worker.sleep(test_delay)
+
+ -- unsupported return type
+ boom_follower_and_leader(
+ 'function() print("this cannot be serialized") end')
+ worker.sleep(test_delay)
+
+ tap.same({n = n_instances}, map('nil'),
+ 'nil values are counted as returned')
+ worker.sleep(test_delay)
+
+ local exp = {n = n_instances}
+ for i=1,n_instances do
+ table.insert(exp, {nil, 2, nil, n=3})
+ end
+ local got = map('require("kluautil").kr_table_pack(nil, 2, nil)')
+ tap.same(got, exp, 'kr_table_pack handles nil values')
+ worker.sleep(test_delay)
+end
+
+local started = false
+function tests_start()
+ -- just in case, duplicates should not happen
+ if started then
+ log('huh? duplicate test invocation ignored, a retrasmit?')
+ return
+ end
+ started = true
+ log('start query triggered, scheduling tests')
+
+ -- DNS queries and map() commands must be serviced while sleep is running
+ worker.coroutine(function() worker.sleep(3600) end)
+
+ worker.coroutine(tests)
+end
+-- Deckard query will trigger tests
+policy.add(policy.suffix(tests_start, {'\5start\0'}))
+
+function tests_done()
+ print('final query triggered')
+ event.after(0, function()
+ tap.done(checks_total)
+ end)
+end
+-- Deckard query will execute tap.done() which will call os.exit()
+-- i.e. this callback has to be called only after answer to Deckard was sent
+policy.add(policy.suffix(tests_done, {'\4done\0'}), true)
+
+-- add delay to each query to force scheduler to interleave tests and DNS queries
+policy.add(policy.all(
+ function()
+ local delay = 10 -- ms
+ log('packet delayed by %d ms', delay)
+ worker.sleep(delay / 1000)
+ end))
+
+wait_for_sockets()
+
+{% if DAEMON_NAME == "kresd1" %}
+
+-- forward to Deckard test server
+policy.add(policy.all(policy.FORWARD('192.0.2.1')))
+
+{% else %}
+
+-- forward to next kresd instance in chain
+{# find out IP address of kresd instance with lower number,
+ i.e. kresd2 forwards to kresd1 #}
+policy.add(policy.all(policy.FORWARD('{{ PROGRAMS[ "kresd" ~ (DAEMON_NAME[-1]|int() - 1)]["address"] }}')))
+
+{% endif %}
diff --git a/daemon/lua/map.test.integr/query-while-map-is-running.rpl b/daemon/lua/map.test.integr/query-while-map-is-running.rpl
new file mode 100644
index 0000000..8590fc8
--- /dev/null
+++ b/daemon/lua/map.test.integr/query-while-map-is-running.rpl
@@ -0,0 +1,312 @@
+; does not make any practical difference so we limit ourselves to single test run
+query-minimization: off
+CONFIG_END
+
+SCENARIO_BEGIN Empty answers to any query - forwarding without validation
+
+; forwarding target
+RANGE_BEGIN 1 1000000
+ ADDRESS 192.0.2.1
+
+; NODATA to everything
+ENTRY_BEGIN
+MATCH opcode
+ADJUST copy_id copy_query
+REPLY NOERROR QR
+SECTION QUESTION
+. IN SOA
+SECTION ANSWER
+. 86400 IN SOA rootns. you.test. 2017071100 1800 900 604800 86400
+ENTRY_END
+RANGE_END
+
+STEP 10 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+start. IN TXT
+ENTRY_END
+
+STEP 11 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+start. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+
+STEP 1001 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1001. IN TXT
+ENTRY_END
+
+STEP 1002 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1001. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1003 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1003. IN TXT
+ENTRY_END
+
+STEP 1004 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1003. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1005 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1005. IN TXT
+ENTRY_END
+
+STEP 1006 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1005. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1007 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1007. IN TXT
+ENTRY_END
+
+STEP 1008 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1007. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1009 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1009. IN TXT
+ENTRY_END
+
+STEP 1010 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1009. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1011 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1011. IN TXT
+ENTRY_END
+
+STEP 1012 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1011. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1013 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1013. IN TXT
+ENTRY_END
+
+STEP 1014 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1013. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1015 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1015. IN TXT
+ENTRY_END
+
+STEP 1016 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1015. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1017 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1017. IN TXT
+ENTRY_END
+
+STEP 1018 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1017. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1019 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1019. IN TXT
+ENTRY_END
+
+STEP 1020 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1019. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1021 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1021. IN TXT
+ENTRY_END
+
+STEP 1022 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1021. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1023 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1023. IN TXT
+ENTRY_END
+
+STEP 1024 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1023. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1025 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1025. IN TXT
+ENTRY_END
+
+STEP 1026 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1025. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1027 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1027. IN TXT
+ENTRY_END
+
+STEP 1028 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1027. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1029 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1029. IN TXT
+ENTRY_END
+
+STEP 1030 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1029. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1031 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+test1031. IN TXT
+ENTRY_END
+
+STEP 1032 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+test1031. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+STEP 1033 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+done. IN TXT
+ENTRY_END
+
+STEP 1034 CHECK_ANSWER
+ENTRY_BEGIN
+REPLY NOERROR QR RD RA
+MATCH opcode rcode flags question answer
+SECTION QUESTION
+done. IN TXT
+SECTION ANSWER
+ENTRY_END
+
+SCENARIO_END
diff --git a/daemon/lua/meson.build b/daemon/lua/meson.build
new file mode 100644
index 0000000..08539b0
--- /dev/null
+++ b/daemon/lua/meson.build
@@ -0,0 +1,61 @@
+# daemon: lua modules
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+config_tests += [
+ ['controlsock', files('controlsock.test.lua')],
+ ['krprint', files('krprint.test.lua')],
+ ['ta', files('trust_anchors.test/ta.test.lua')],
+ ['ta_bootstrap', files('trust_anchors.test/bootstrap.test.lua')],
+]
+
+integr_tests += [
+ ['map', meson.current_source_dir() / 'map.test.integr'],
+]
+
+lua_config = configuration_data()
+lua_config.set('keyfile_default', keyfile_default)
+lua_config.set('etc_dir', etc_dir)
+lua_config.set('run_dir', run_dir)
+lua_config.set('systemd_cache_dir', systemd_cache_dir)
+lua_config.set('unmanaged', managed_ta ? 'false' : 'true')
+
+trust_anchors = configure_file(
+ input: 'trust_anchors.lua.in',
+ output: 'trust_anchors.lua',
+ configuration: lua_config,
+)
+
+sandbox = configure_file(
+ input: 'sandbox.lua.in',
+ output: 'sandbox.lua',
+ configuration: lua_config,
+)
+
+distro_preconfig = configure_file(
+ input: 'distro-preconfig.lua.in',
+ output: 'distro-preconfig.lua',
+ configuration: lua_config,
+)
+
+run_target( # run manually to re-generate kres-gen.lua
+ 'kres-gen',
+ command: find_program('./kres-gen.sh'),
+)
+
+lua_src = [
+ files('postconfig.lua'),
+ files('kres.lua'),
+ files('kres-gen.lua'),
+ sandbox,
+ trust_anchors,
+ files('zonefile.lua'),
+ files('kluautil.lua'),
+ files('krprint.lua'),
+ distro_preconfig,
+]
+
+# install daemon lua sources
+install_data(
+ lua_src,
+ install_dir: lib_dir,
+)
diff --git a/daemon/lua/postconfig.lua b/daemon/lua/postconfig.lua
new file mode 100644
index 0000000..818a3fc
--- /dev/null
+++ b/daemon/lua/postconfig.lua
@@ -0,0 +1,70 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+local ffi = require('ffi')
+local C = ffi.C
+
+local function count_sockets()
+ local dns_socks = 0
+ local control_socks = 0
+ for _, socket in ipairs(net.list()) do
+ if socket.kind == 'control' then
+ control_socks = control_socks + 1
+ elseif (socket.kind == 'dns' or
+ socket.kind == 'xdp' or
+ socket.kind == 'tls' or
+ socket.kind == 'doh' or
+ socket.kind == 'doh2') then
+ dns_socks = dns_socks + 1
+ end
+ end
+ return dns_socks, control_socks
+end
+
+local n_dns_socks, n_control_socks = count_sockets()
+
+-- Check and set control sockets path
+worker.control_path = worker.control_path or (worker.cwd .. '/control/')
+
+-- Bind to control socket by default
+if n_control_socks == 0 and not env.KRESD_NO_LISTEN then
+ local path = worker.control_path..worker.pid
+ local ok, err = pcall(net.listen, path, nil, { kind = 'control' })
+ if not ok then
+ warn('bind to '..path..' failed '..err)
+ end
+end
+
+-- Listen on localhost
+if n_dns_socks == 0 and not env.KRESD_NO_LISTEN then
+ local ok, err = pcall(net.listen, '127.0.0.1')
+ if not ok then
+ error('bind to 127.0.0.1@53 '..err)
+ end
+ -- Binding to other ifaces may fail
+ ok, err = pcall(net.listen, '127.0.0.1', 853)
+ if not ok and verbose() then
+ log('bind to 127.0.0.1@853 '..err)
+ end
+ ok, err = pcall(net.listen, '::1')
+ if not ok and verbose() then
+ log('bind to ::1@53 '..err)
+ end
+ ok, err = pcall(net.listen, '::1', 853)
+ if not ok and verbose() then
+ log('bind to ::1@853 '..err)
+ end
+ -- Exit when kresd isn't listening on any interfaces
+ n_dns_socks, _ = count_sockets()
+ if n_dns_socks == 0 then
+ panic('not listening on any interface, exiting...')
+ end
+end
+-- Open cache if not set/disabled
+if not cache.current_size then
+ cache.size = 100 * MB
+end
+
+-- If no addresses for root servers are set, load them from the default file
+if C.kr_zonecut_is_empty(kres.context().root_hints) then
+ _hint_root_file()
+end
diff --git a/daemon/lua/sandbox.lua.in b/daemon/lua/sandbox.lua.in
new file mode 100644
index 0000000..993f36d
--- /dev/null
+++ b/daemon/lua/sandbox.lua.in
@@ -0,0 +1,773 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+local debug = require('debug')
+local ffi = require('ffi')
+local kluautil = require('kluautil')
+local krprint = require("krprint")
+
+-- Units
+kB = 1024
+MB = 1024*kB
+GB = 1024*MB
+-- Time
+sec = 1000
+second = sec
+minute = 60 * sec
+min = minute
+hour = 60 * minute
+day = 24 * hour
+
+-- Logging
+function panic(fmt, ...)
+ print(debug.traceback('error occurred here (config filename:lineno is '
+ .. 'at the bottom, if config is involved):', 2))
+ error(string.format('ERROR: '.. fmt, ...), 0)
+end
+function warn(fmt, ...)
+ io.stderr:write(string.format(fmt..'\n', ...))
+end
+function log(fmt, ...)
+ print(string.format(fmt, ...))
+end
+
+-- Resolver bindings
+kres = require('kres')
+if rawget(kres, 'str2dname') ~= nil then
+ todname = kres.str2dname
+end
+
+worker.resolve_pkt = function (pkt, options, finish, init)
+ options = kres.mk_qflags(options)
+ local task = ffi.C.worker_resolve_start(pkt, options)
+
+ -- Deal with finish and init callbacks
+ if finish ~= nil then
+ local finish_cb
+ finish_cb = ffi.cast('trace_callback_f',
+ function (req)
+ jit.off(true, true) -- JIT for (C -> lua)^2 nesting isn't allowed
+ finish(req.answer, req)
+ finish_cb:free()
+ end)
+ task.ctx.req.trace_finish = finish_cb
+ end
+ if init ~= nil then
+ init(task.ctx.req)
+ end
+
+ return ffi.C.worker_resolve_exec(task, pkt) == 0
+end
+
+worker.resolve = function (qname, qtype, qclass, options, finish, init)
+ -- Alternatively use named arguments
+ if type(qname) == 'table' then
+ local t = qname
+ qname = t.name
+ qtype = t.type
+ qclass = t.class
+ options = t.options
+ finish = t.finish
+ init = t.init
+ end
+ qtype = qtype or kres.type.A
+ qclass = qclass or kres.class.IN
+ options = kres.mk_qflags(options)
+ -- LATER: nicer errors for rubbish in qname, qtype, qclass?
+ local pkt = ffi.C.worker_resolve_mk_pkt(qname, qtype, qclass, options)
+ if pkt == nil then
+ panic('failure in worker.resolve(); probably invalid qname "%s"', qname)
+ end
+ local ret = worker.resolve_pkt(pkt, options, finish, init)
+ ffi.C.knot_pkt_free(pkt);
+ return ret
+end
+resolve = worker.resolve
+
+-- Shorthand for aggregated per-worker information
+worker.info = function ()
+ local t = worker.stats()
+ t.pid = worker.pid
+ return t
+end
+
+-- Resolver mode of operation
+local current_mode = 'normal'
+local mode_table = { normal=0, strict=1, permissive=2 }
+function mode(m)
+ if not m then return current_mode end
+ if not mode_table[m] then error('unsupported mode: '..m) end
+ -- Update current operation mode
+ current_mode = m
+ option('STRICT', current_mode == 'strict')
+ option('PERMISSIVE', current_mode == 'permissive')
+ return true
+end
+
+-- Trivial option alias
+function reorder_RR(val)
+ return option('REORDER_RR', val)
+end
+
+-- Get/set resolver options via name (string)
+function option(name, val)
+ local flags = kres.context().options;
+ -- Note: no way to test existence of flags[name] but we want error anyway.
+ name = string.upper(name) -- convenience
+ if val ~= nil then
+ if (val ~= true) and (val ~= false) then
+ panic('invalid option value: ' .. tostring(val))
+ end
+ flags[name] = val;
+ end
+ return flags[name];
+end
+
+-- Function aliases
+-- `env.VAR returns os.getenv(VAR)`
+env = {}
+setmetatable(env, {
+ __index = function (_, k) return os.getenv(k) end
+})
+
+-- Quick access to interfaces
+-- `net.<iface>` => `net.interfaces()[iface]`
+-- `net = {addr1, ..}` => `net.listen(name, addr1)`
+-- `net.ipv{4,6} = {true, false}` => enable/disable IPv{4,6}
+setmetatable(net, {
+ __index = function (t, k)
+ local v = rawget(t, k)
+ if v then return v
+ elseif k == 'ipv6' then return not option('NO_IPV6')
+ elseif k == 'ipv4' then return not option('NO_IPV4')
+ else return net.interfaces()[k]
+ end
+ end,
+ __newindex = function (t,k,v)
+ if k == 'ipv6' then return option('NO_IPV6', not v)
+ elseif k == 'ipv4' then return option('NO_IPV4', not v)
+ else
+ local iname = rawget(net.interfaces(), v)
+ if iname then t.listen(iname)
+ else t.listen(v)
+ end
+ end
+ end
+})
+
+-- Syntactic sugar for module loading
+-- `modules.<name> = <config>`
+setmetatable(modules, {
+ __newindex = function (_, k, v)
+ if type(k) == 'number' then
+ k, v = v, nil
+ end
+ if not rawget(_G, k) then
+ modules.load(k)
+ k = string.match(k, '[%w_]+')
+ local mod = _G[k]
+ local config = mod and rawget(mod, 'config')
+ if mod ~= nil and config ~= nil then
+ if k ~= v then config(v)
+ else config()
+ end
+ end
+ end
+ end
+})
+
+-- Set up lua table for a C module. (Internal function.)
+function modules_create_table_for_c(kr_module_ud)
+ local kr_module = ffi.cast('struct kr_module **', kr_module_ud)[0]
+ --- Set up the global table named according to the module.
+ if kr_module.config == nil and kr_module.props == nil then
+ return
+ end
+ local module = {}
+ local module_name = ffi.string(kr_module.name)
+ _G[module_name] = module
+
+ --- Construct lua functions for properties.
+ if kr_module.props ~= nil then
+ local i = 0
+ while true do
+ local prop = kr_module.props[i]
+ local cb = prop.cb
+ if cb == nil then break; end
+ module[ffi.string(prop.name)] =
+ function (arg) -- lua wrapper around kr_prop_cb function typedef
+ local arg_conv
+ if type(arg) == 'table' or type(arg) == 'boolean' then
+ arg_conv = tojson(arg)
+ elseif arg ~= nil then
+ arg_conv = tostring(arg)
+ end
+ local ret_cstr = cb(ffi.C.the_worker.engine, kr_module, arg_conv)
+ if ret_cstr == nil then
+ return nil
+ end
+ -- LATER(optim.): superfluous copying
+ local ret_str = ffi.string(ret_cstr)
+ -- This is a bit ugly, but the API is that invalid JSON
+ -- should be just returned as string :-(
+ local status, ret = pcall(fromjson, ret_str)
+ if not status then ret = ret_str end
+ ffi.C.free(ret_cstr)
+ return ret
+ end
+ i = i + 1
+ end
+ end
+
+ --- Construct lua function for config().
+ if kr_module.config ~= nil then
+ module.config =
+ function (arg)
+ local arg_conv
+ if type(arg) == 'table' or type(arg) == 'boolean' then
+ arg_conv = tojson(arg)
+ elseif arg ~= nil then
+ arg_conv = tostring(arg)
+ end
+ return kr_module.config(kr_module, arg_conv)
+ end
+ end
+
+ --- Add syntactic sugar for get() and set() properties.
+ --- That also "catches" any commands like `moduleName.foo = bar`.
+ local m_index, m_newindex
+ local get_f = rawget(module, 'get')
+ if get_f ~= nil then
+ m_index = function (_, key)
+ return get_f(key)
+ end
+ else
+ m_index = function ()
+ error('module ' .. module_name .. ' does not support indexing syntax sugar')
+ end
+ end
+ local set_f = rawget(module, 'set')
+ if set_f ~= nil then
+ m_newindex = function (_, key, value)
+ -- This will produce a nasty error on some non-string parameters.
+ -- Still, we already use it with integer values, e.g. in predict module :-/
+ return set_f(key .. ' ' .. value)
+ end
+ else
+ m_newindex = function ()
+ error('module ' .. module_name .. ' does not support assignment syntax sugar')
+ end
+ end
+ setmetatable(module, {
+ -- note: the two functions only get called for *missing* indices
+ __index = m_index,
+ __newindex = m_newindex,
+ })
+end
+
+local layer_ctx = ffi.C.kr_layer_t_static
+-- Utilities internal for lua layer glue; see ../ffimodule.c
+modules_ffi_layer_wrap1 = function (layer_cb)
+ return layer_cb(layer_ctx.state, layer_ctx.req)
+end
+modules_ffi_layer_wrap2 = function (layer_cb)
+ return layer_cb(layer_ctx.state, layer_ctx.req, layer_ctx.pkt)
+end
+modules_ffi_layer_wrap_checkout = function (layer_cb)
+ return layer_cb(layer_ctx.state, layer_ctx.req, layer_ctx.pkt,
+ layer_ctx.dst, layer_ctx.is_stream)
+end
+modules_ffi_wrap_modcb = function (cb, kr_module_ud) -- this one isn't for layer
+ local kr_module = ffi.cast('struct kr_module **', kr_module_ud)[0]
+ return cb(kr_module)
+end
+
+-- Return filesystem size where the cache resides.
+cache.fssize = function ()
+ local path = cache.current_storage or '.'
+ -- As it is now, `path` may or may not include the lmdb:// prefix.
+ if string.sub(path, 1, 7) == 'lmdb://' then
+ path = string.sub(path, 8)
+ end
+ if #path == 0 then
+ path = '.'
+ end
+ local size = tonumber(ffi.C.kr_fssize(path))
+ if size < 0 then
+ panic('cache.fssize(): %s', ffi.string(ffi.C.knot_strerror(size)))
+ else
+ return size
+ end
+end
+
+cache.clear = function (name, exact_name, rr_type, chunk_size, callback, prev_state)
+ if name == nil or (name == '.' and not exact_name) then
+ -- keep same output format as for 'standard' clear
+ local total_count = cache.count()
+ if not cache.clear_everything() then
+ error('unable to clear everything')
+ end
+ return {count = total_count}
+ end
+ -- Check parameters, in order, and set defaults if missing.
+ local dname = kres.str2dname(name)
+ if not dname then error('cache.clear(): incorrect name passed') end
+ if exact_name == nil then exact_name = false end
+ if type(exact_name) ~= 'boolean'
+ then error('cache.clear(): incorrect exact_name passed') end
+
+ local cach = kres.context().cache;
+ local rettable = {}
+ -- Apex warning. If the caller passes a custom callback,
+ -- we assume they are advanced enough not to need the check.
+ -- The point is to avoid repeating the check in each callback iteration.
+ if callback == nil then
+ local apex_array = ffi.new('knot_dname_t *[1]') -- C: dname **apex_array
+ local ret = ffi.C.kr_cache_closest_apex(cach, dname, false, apex_array)
+ if ret < 0 then
+ error(ffi.string(ffi.C.knot_strerror(ret))) end
+ if not ffi.C.knot_dname_is_equal(apex_array[0], dname) then
+ local apex_str = kres.dname2str(apex_array[0])
+ rettable.not_apex = 'to clear proofs of non-existence call '
+ .. 'cache.clear(\'' .. tostring(apex_str) ..'\')'
+ rettable.subtree = apex_str
+ end
+ ffi.C.free(apex_array[0])
+ end
+
+ if rr_type ~= nil then
+ -- Special case, without any subtree searching.
+ if not exact_name
+ then error('cache.clear(): specifying rr_type only supported with exact_name') end
+ if chunk_size or callback
+ then error('cache.clear(): chunk_size and callback parameters not supported with rr_type') end
+ local ret = ffi.C.kr_cache_remove(cach, dname, rr_type)
+ if ret < 0 then error(ffi.string(ffi.C.knot_strerror(ret))) end
+ return {count = 1}
+ end
+
+ if chunk_size == nil then chunk_size = 100 end
+ if type(chunk_size) ~= 'number' or chunk_size <= 0
+ then error('cache.clear(): chunk_size has to be a positive integer') end
+
+ -- Do the C call, and add chunk_size warning.
+ rettable.count = ffi.C.kr_cache_remove_subtree(cach, dname, exact_name, chunk_size)
+ if rettable.count == chunk_size then
+ local msg_extra = ''
+ if callback == nil then
+ msg_extra = '; the default callback will continue asynchronously'
+ end
+ rettable.chunk_limit = 'chunk size limit reached' .. msg_extra
+ end
+
+ -- Default callback function: repeat after 1ms
+ if callback == nil then callback =
+ function (cbname, cbexact_name, cbrr_type, cbchunk_size, cbself, cbprev_state, cbrettable)
+ if cbrettable.count < 0 then error(ffi.string(ffi.C.knot_strerror(cbrettable.count))) end
+ if cbprev_state == nil then cbprev_state = { round = 0 } end
+ if type(cbprev_state) ~= 'table'
+ then error('cache.clear() callback: incorrect prev_state passed') end
+ cbrettable.round = cbprev_state.round + 1
+ if (cbrettable.count == cbchunk_size) then
+ event.after(1, function ()
+ cache.clear(cbname, cbexact_name, cbrr_type, cbchunk_size, cbself, cbrettable)
+ end)
+ elseif cbrettable.round > 1 then
+ log('[cache] asynchonous cache.clear(\'' .. cbname .. '\', '
+ .. tostring(cbexact_name) .. ') finished')
+ end
+ return cbrettable
+ end
+ end
+ return callback(name, exact_name, rr_type, chunk_size, callback, prev_state, rettable)
+end
+-- Syntactic sugar for cache
+-- `cache[x] -> cache.get(x)`
+-- `cache.{size|storage} = value`
+setmetatable(cache, {
+ __index = function (t, k)
+ local res = rawget(t, k)
+ if not res and not rawget(t, 'current_size') then return res end
+ -- Beware: t.get returns empty table on failure to find.
+ -- That would be confusing here (breaking kresc), so return nil instead.
+ res = t.get(k)
+ if res and next(res) ~= nil then return res else return nil end
+ end,
+ __newindex = function (t,k,v)
+ -- Defaults
+ local storage = rawget(t, 'current_storage')
+ if not storage then storage = 'lmdb://' end
+ local size = rawget(t, 'current_size')
+ if not size then size = 10*MB end
+ -- Declarative interface for cache
+ if k == 'size' then t.open(v, storage)
+ elseif k == 'storage' then t.open(size, v) end
+ end
+})
+
+-- Make sandboxed environment
+local function make_sandbox(defined)
+ local __protected = { worker = true, env = true, modules = true, cache = true, net = true, trust_anchors = true }
+
+ -- Compute and export the list of top-level names (hidden otherwise)
+ local nl = ""
+ for n in pairs(defined) do
+ nl = nl .. n .. "\n"
+ end
+
+ return setmetatable({ __orig_name_list = nl }, {
+ __index = defined,
+ __newindex = function (_, k, v)
+ if __protected[k] then
+ for k2,v2 in pairs(v) do
+ defined[k][k2] = v2
+ end
+ else
+ defined[k] = v
+ end
+ end
+ })
+end
+
+-- Compatibility sandbox
+_G = make_sandbox(getfenv(0))
+setfenv(0, _G)
+
+-- Load default modules
+trust_anchors = require('trust_anchors')
+modules.load('ta_update')
+modules.load('ta_signal_query')
+modules.load('policy')
+modules.load('priming')
+modules.load('detect_time_skew')
+modules.load('detect_time_jump')
+modules.load('ta_sentinel')
+modules.load('edns_keepalive')
+modules.load('refuse_nord')
+modules.load('watchdog')
+
+-- Load keyfile_default
+trust_anchors.add_file('@keyfile_default@', @unmanaged@)
+
+local function eval_cmd_compile(line, raw)
+ -- Compatibility sandbox code loading
+ local function load_code(code)
+ if getfenv then -- Lua 5.1
+ return loadstring(code)
+ else -- Lua 5.2+
+ return load(code, nil, 't', _ENV)
+ end
+ end
+ local err, chunk
+ chunk, err = load_code(raw and 'return '..line or 'return table_print('..line..')')
+ if err then
+ chunk, err = load_code(line)
+ end
+ return chunk, err
+end
+
+-- Interactive command evaluation
+function eval_cmd(line, raw)
+ local chunk, err = eval_cmd_compile(line, raw)
+ if not err then
+ return chunk()
+ else
+ error(err)
+ end
+end
+
+-- Pretty printing
+local pprint = require('krprint').pprint
+function table_print(...)
+ local strs = {}
+ local nargs = select('#', ...)
+ if nargs == 0 then
+ return nil
+ end
+ for n=1,nargs do
+ local arg = select(n, ...)
+ local arg_str = pprint(arg)
+ if nargs > 1 then
+ table.insert(strs, string.format("%s\t-- result # %d", arg_str, n))
+ else
+ table.insert(strs, arg_str)
+ end
+ end
+ return table.concat(strs, '\n')
+end
+
+-- This extends the worker module to allow asynchronous execution of functions and nonblocking I/O.
+-- The current implementation combines cqueues for Lua interface, and event.socket() in order to not
+-- block resolver engine while waiting for I/O or timers.
+--
+local has_cqueues, cqueues = pcall(require, 'cqueues')
+if has_cqueues then
+
+ -- Export the asynchronous sleep function
+ worker.sleep = cqueues.sleep
+
+ -- Create metatable for workers to define the API
+ -- It can schedule multiple cqueues and yield execution when there's a wait for blocking I/O or timer
+ local asynchronous_worker_mt = {
+ work = function (self)
+ local ok, err, _, co = self.cq:step(0)
+ if not ok then
+ warn('[%s] error: %s %s', self.name or 'worker', err, debug.traceback(co))
+ end
+ -- Reschedule timeout or create new one
+ local timeout = self.cq:timeout()
+ if timeout then
+ -- Throttle timeouts to avoid too frequent wakeups
+ if timeout == 0 then timeout = 0.00001 end
+ -- Convert from seconds to duration
+ timeout = timeout * sec
+ if not self.next_timeout then
+ self.next_timeout = event.after(timeout, self.on_step)
+ else
+ event.reschedule(self.next_timeout, timeout)
+ end
+ else -- Cancel running timeout when there is no next deadline
+ if self.next_timeout then
+ event.cancel(self.next_timeout)
+ self.next_timeout = nil
+ end
+ end
+ end,
+ wrap = function (self, f)
+ self.cq:wrap(f)
+ end,
+ loop = function (self)
+ self.on_step = function () self:work() end
+ self.event_fd = event.socket(self.cq:pollfd(), self.on_step)
+ end,
+ close = function (self)
+ if self.event_fd then
+ event.cancel(self.event_fd)
+ self.event_fd = nil
+ end
+ end,
+ }
+
+ -- Implement the coroutine worker with cqueues
+ local function worker_new (name)
+ return setmetatable({name = name, cq = cqueues.new()}, { __index = asynchronous_worker_mt })
+ end
+
+ -- Create a default background worker
+ worker.bg_worker = worker_new('worker.background')
+ worker.bg_worker:loop()
+
+ -- Wrap a function for asynchronous execution
+ function worker.coroutine (f)
+ worker.bg_worker:wrap(f)
+ end
+else
+ -- Disable asynchronous execution
+ local function disabled ()
+ error('Lua library cqueues is required for asynchronous execution (luaJIT requires library for Lua 5.1)')
+ end
+ worker.sleep = disabled
+ worker.map = disabled
+ worker.coroutine = disabled
+ worker.bg_worker = setmetatable({}, { __index = disabled })
+end
+
+-- Global commands for map()
+
+-- must be public because it is called from eval_cmd()
+-- when map() commands are read from control socket
+function _map_luaobj_call_wrapper(cmd)
+ local func = eval_cmd_compile(cmd, true)
+ local ret = kluautil.kr_table_pack(xpcall(func, debug.traceback))
+ local ok, serial = pcall(krprint.serialize_lua, ret, 'error')
+ if not ok then
+ if verbose() then
+ log('failed to serialize map() response %s (%s)',
+ table_print(ret), serial)
+ end
+ return krprint.serialize_lua(
+ kluautil.kr_table_pack(false, "returned values cannot be serialized: "
+ .. serial))
+ else
+ return serial
+ end
+end
+
+local function _sock_errmsg(path, desc)
+ return string.format(
+ 'map() error while communicating with %s: %s',
+ path, desc)
+end
+
+local function _sock_check(sock, call, params, path, desc)
+ local errprefix = _sock_errmsg(path, desc) .. ': '
+ local retvals = kluautil.kr_table_pack(pcall(call, unpack(params)))
+ local ok = retvals[1]
+ if not ok then
+ error(errprefix .. tostring(retvals[2]))
+ end
+ local rerr, werr = sock:error()
+ if rerr or werr then
+ error(string.format('%sread error %s; write error %s', errprefix, rerr, werr))
+ end
+ if retvals[2] == nil then
+ error(errprefix .. 'unexpected nil result')
+ end
+ return unpack(retvals, 2, retvals.n)
+end
+
+local function _sock_assert(condition, path, desc)
+ if not condition then
+ error(_sock_errmsg(path, desc))
+ end
+end
+
+local function map_send_recv(cmd, path)
+ local bit = require('bit')
+ local socket = require('cqueues.socket')
+ local s = socket.connect({ path = path })
+ s:setmaxerrs(0)
+ s:setmode('bn', 'bn')
+ local status, err = pcall(s.connect, s)
+ if not status then
+ log('map() error while connecting to control socket %s: '
+ .. '%s (ignoring this socket)', path, err)
+ return nil
+ end
+ local ret = _sock_check(s, s.write, {s, '__binary\n'}, path,
+ 'write __binary')
+ _sock_assert(ret, path,
+ 'write __binary result')
+ local recv = _sock_check(s, s.read, {s, 2}, path,
+ 'read reply to __binary')
+ _sock_assert(recv and recv == '> ', path,
+ 'unexpected reply to __binary')
+ _sock_check(s, s.write, {s, cmd..'\n'}, path,
+ 'command write')
+ recv = _sock_check(s, s.read, {s, 4}, path,
+ 'response length read')
+ _sock_assert(recv and #recv == 4, path,
+ 'length of response length preambule does not match')
+ local len = tonumber(recv:byte(1))
+ for i=2,4 do
+ len = bit.bor(bit.lshift(len, 8), tonumber(recv:byte(i)))
+ end
+ ret = _sock_check(s, s.read, {s, len}, path,
+ 'read response')
+ _sock_assert(ret and #ret == len, path,
+ 'actual response length does not match length in preambule')
+ s:close()
+ return ret
+end
+
+-- internal use only
+-- Call cmd on each instance via control sockets.
+-- @param format - "luaobj" if individual results should be Lua objects
+-- - "strings" for eval_cmd output for each instance
+-- @returns table with results, one item per instance + key n=number of instances
+-- (order of return values is undefined)
+-- @throws Lua error if:
+-- - communication failed in the middle of trasaction
+-- - a result is not serializable
+-- - individual call throws an error
+-- - number of return values != 1 per instance per call
+-- - cmd execution state is undefined after an error
+-- Connection errors at the beginning are ignored to paper over leftover dead sockets.
+function map(cmd, format)
+ local local_sockets = {}
+ local results = {}
+
+ if (type(cmd) ~= 'string') then
+ panic('map() command must be a string') end
+ if string.find(cmd, '\n', 1, true) then
+ panic('map() command cannot contain literal \\n, escape it with \\010') end
+ if (#cmd <= 0) then
+ panic('map() command must be non-empty') end
+ -- syntax check on input command to detect typos early
+ local chunk, err = eval_cmd_compile(cmd, false)
+ if not chunk then
+ panic('failure when compiling map() command: %s', err)
+ end
+
+ format = format or 'luaobj'
+ if (format ~= 'luaobj' and format ~= 'strings') then
+ panic('map() output format must be luaobj or strings') end
+ if format == 'luaobj' then
+ cmd = '_map_luaobj_call_wrapper([=====[' .. cmd .. ']=====])'
+ end
+
+ -- find out control socket paths
+ for _,v in pairs(net.list()) do
+ if (v['kind'] == 'control') and (v['transport']['family'] == 'unix') then
+ table.insert(local_sockets, string.match(v['transport']['path'], '^.*/([^/]+)$'))
+ end
+ end
+ local filetab = kluautil.list_dir(worker.control_path)
+ if next(filetab) == nil then
+ panic('no control sockets found in directory %s',
+ worker.control_path)
+ end
+
+ local result_count = 0
+ -- finally execute it on all instances
+ for _, file in ipairs(filetab) do
+ local local_exec = false
+ for _, lsoc in ipairs(local_sockets) do
+ if file == lsoc then
+ local_exec = true
+ end
+ end
+ local path = worker.control_path..file
+ local path_name = (local_exec and 'this instance') or path
+ if verbose() then
+ log('executing map() on %s: command %s', path_name, cmd)
+ end
+ local ret
+ if local_exec then
+ ret = eval_cmd(cmd)
+ else
+ ret = map_send_recv(cmd, path)
+ -- skip dead sockets (leftovers from dead instances)
+ if ret == nil then
+ goto continue
+ end
+ end
+ result_count = result_count + 1
+ -- return value is output from eval_cmd
+ -- i.e. string including "quotes" and Lua escaping in between
+ assert(type(ret) == 'string', 'map() protocol error, '
+ .. 'string not retured by follower')
+ assert(#ret >= 2 and
+ string.sub(ret, 1, 1) == "'"
+ and string.sub(ret, -1, -1) == "'",
+ 'map() protocol error, value returned by follower does '
+ .. 'not look like a string')
+ -- deserialize string: remove "quotes" and de-escape bytes
+ ret = krprint.deserialize_lua(ret)
+ if format == 'luaobj' then
+ -- ret should be table with xpcall results serialized into string
+ ret = krprint.deserialize_lua(ret)
+ assert(type(ret) == 'table', 'map() protocol error, '
+ .. 'table with results not retured by follower')
+ if (ret.n ~= 2) then
+ if verbose() then
+ log('got unsupported map() response: %s', table_print(ret))
+ end
+ panic('unexpected number of return values in map() response: '
+ .. 'only single return value is allowed, '
+ .. 'use kluautil.kr_table_pack() helper')
+ end
+ local ok, retval = ret[1], ret[2]
+ if ok == false then
+ panic('error when executing map() command on control socket %s: '
+ .. '%s. command execution state is now undefined!',
+ path, retval)
+ end
+ -- drop wrapper table and return only the actual return value
+ ret = retval
+ end
+ results[result_count] = ret
+ ::continue::
+ end
+ results.n = result_count
+ return results
+end
diff --git a/daemon/lua/trust_anchors.lua.in b/daemon/lua/trust_anchors.lua.in
new file mode 100644
index 0000000..af4421e
--- /dev/null
+++ b/daemon/lua/trust_anchors.lua.in
@@ -0,0 +1,532 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+-- Load the module
+local ffi = require 'ffi'
+local kres = require('kres')
+local C = ffi.C
+
+local trust_anchors -- the public pseudo-module, exported as global variable
+
+-- RFC5011 state table
+local key_state = {
+ Start = 'Start', AddPend = 'AddPend', Valid = 'Valid',
+ Missing = 'Missing', Revoked = 'Revoked', Removed = 'Removed'
+}
+
+local function upgrade_required(msg)
+ if msg then
+ msg = msg .. '\n'
+ else
+ msg = ''
+ end
+ panic('Configuration upgrade required: ' .. msg .. 'Please refer to ' ..
+ 'https://knot-resolver.readthedocs.io/en/stable/upgrading.html')
+end
+
+-- TODO: Move bootstrap to a separate module or even its own binary
+-- remove UTC timezone specification if present or throw error
+local function time2utc(orig_timespec)
+ local patterns = {'[+-]00:00$', 'Z$'}
+ for _, pattern in ipairs(patterns) do
+ local timespec, removals = string.gsub(orig_timespec, pattern, '')
+ if removals == 1 then
+ return timespec
+ end
+ end
+ error(string.format('unsupported time specification: %s', orig_timespec))
+end
+
+local function keydigest_is_valid(valid_from, valid_until)
+ local format = '%Y-%m-%dT%H:%M:%S'
+ local time_now = os.date('!%Y-%m-%dT%H:%M:%S') -- ! forces UTC
+ local time_diff = ffi.new('double[1]')
+ local err = ffi.C.kr_strptime_diff(
+ format, time_now, time2utc(valid_from), time_diff)
+ if (err ~= nil) then
+ error(string.format('failed to process "validFrom" constraint: %s',
+ ffi.string(err)))
+ end
+ local from_ok = time_diff[0] > 0
+
+ -- optional attribute
+ local until_ok = true
+ if valid_until then
+ err = ffi.C.kr_strptime_diff(
+ format, time_now, time2utc(valid_until), time_diff)
+ if (err ~= nil) then
+ error(string.format('failed to process "validUntil" constraint: %s',
+ ffi.string(err)))
+ end
+ until_ok = time_diff[0] < 0
+ end
+ return from_ok and until_ok
+end
+
+local function parse_xml_keydigest(attrs, inside, output)
+ local fields = {}
+ local _, n = string.gsub(attrs, "([%w]+)=\"([^\"]*)\"", function (k, v) fields[k] = v end)
+ assert(n >= 1,
+ string.format('cannot parse XML attributes from "%s"', attrs))
+ assert(fields['validFrom'],
+ string.format('mandatory KeyDigest XML attribute validFrom ' ..
+ 'not found in "%s"', attrs))
+ local valid_attrs = {id = true, validFrom = true, validUntil = true}
+ for key, _ in pairs(fields) do
+ assert(valid_attrs[key],
+ string.format('unsupported KeyDigest attribute "%s" found in "%s"',
+ key, attrs))
+ end
+
+ _, n = string.gsub(inside, "<([%w]+).->([^<]+)</[%w]+>", function (k, v) fields[k] = v end)
+ assert(n >= 1,
+ string.format('error parsing KeyDigest XML elements from "%s"',
+ inside))
+ local mandatory_elements = {'KeyTag', 'Algorithm', 'DigestType', 'Digest'}
+ for _, key in ipairs(mandatory_elements) do
+ assert(fields[key],
+ string.format('mandatory element %s is missing in "%s"',
+ key, inside))
+ end
+ assert(n == 4, string.format('found %d elements but expected 4 in %s', n, inside))
+ table.insert(output, fields) -- append to list of parsed keydigests
+end
+
+local function generate_ds(keydigests)
+ local rrset = ''
+ for _, fields in ipairs(keydigests) do
+ local rr = string.format(
+ '. 0 IN DS %s %s %s %s',
+ fields.KeyTag, fields.Algorithm, fields.DigestType, fields.Digest)
+ if keydigest_is_valid(fields['validFrom'], fields['validUntil']) then
+ rrset = rrset .. '\n' .. rr
+ else
+ log('[ ta ] skipping trust anchor "%s" ' ..
+ 'because it is outside of validity range', rr)
+ end
+ end
+ return rrset
+end
+
+local function assert_str_match(str, pattern, expected)
+ local count = 0
+ for _ in string.gmatch(str, pattern) do
+ count = count + 1
+ end
+ assert(count == expected,
+ string.format('expected %d occurences of "%s" but got %d in "%s"',
+ expected, pattern, count, str))
+end
+
+-- Fetch root anchors in XML over HTTPS, returning a zone-file-style string
+-- or false in case of error, and a message.
+local function bootstrap(url, ca)
+ local kluautil = require('kluautil')
+ local file = io.tmpfile()
+ -- RFC 7958, sec. 2, but we don't do precise XML parsing.
+ -- @todo ICANN certificate is verified against current CA
+ -- this is not ideal, as it should rather verify .xml signature which
+ -- is signed by ICANN long-lived cert, but luasec has no PKCS7
+ local rcode, errmsg = kluautil.kr_https_fetch(url, file, ca)
+ if rcode == nil then
+ file:close()
+ return false, string.format('[ ta ] fetch of "%s" failed: %s', url, errmsg)
+ end
+
+ local xml = file:read("*a")
+ file:close()
+
+ -- we support only minimal subset of https://tools.ietf.org/html/rfc7958
+ assert_str_match(xml, '<?xml version="1%.0" encoding="UTF%-8"%?>', 1)
+ assert_str_match(xml, '<TrustAnchor ', 1)
+ assert_str_match(xml, '<Zone>.</Zone>', 1)
+ assert_str_match(xml, '</TrustAnchor>', 1)
+
+ -- Parse root trust anchor, one digest at a time, converting to a zone-file-style string.
+ local keydigests = {}
+ string.gsub(xml, "<KeyDigest([^>]*)>(.-)</KeyDigest>", function(attrs, inside)
+ parse_xml_keydigest(attrs, inside, keydigests)
+ end)
+ local rrset = generate_ds(keydigests)
+ if rrset == '' then
+ return false, string.format('[ ta ] no valid trust anchors found at "%s"', url)
+ end
+ local msg = '[ ta ] Root trust anchors bootstrapped over https with pinned certificate.\n'
+ .. ' You SHOULD verify them manually against original source:\n'
+ .. ' https://www.iana.org/dnssec/files\n'
+ .. '[ ta ] Bootstrapped root trust anchors are:'
+ .. rrset
+ return rrset, msg
+end
+
+local function bootstrap_write(rrstr, filename)
+ local fname_tmp = filename .. '.lock.' .. tostring(worker.pid);
+ local file = assert(io.open(fname_tmp, 'w'))
+ file:write(rrstr)
+ file:close()
+ assert(os.rename(fname_tmp, filename))
+end
+-- Bootstrap end
+
+-- Update ta.comment and return decorated line representing the RR
+-- This is meant to be in zone-file format.
+local function ta_rr_str(ta)
+ ta.comment = ' ' .. ta.state .. ':' .. (ta.timer or '')
+ .. ' ; KeyTag:' .. ta.key_tag -- the tag is just for humans
+ local rr_str = kres.rr2str(ta) .. '\n'
+ if ta.state ~= key_state.Valid and ta.state ~= key_state.Missing then
+ rr_str = '; '..rr_str -- Invalidate key string (for older kresd versions)
+ end
+ return rr_str
+end
+
+-- Write keyset to a file. States and timers are stored in comments.
+local function keyset_write(keyset)
+ if not keyset.managed then -- not to be persistent, this is an error!
+ panic('internal error: keyset_write called for an unmanaged TA')
+ end
+ local fname_tmp = keyset.filename .. '.lock.' .. tostring(worker.pid);
+ local file = assert(io.open(fname_tmp, 'w'))
+ for i = 1, #keyset do
+ file:write(ta_rr_str(keyset[i]))
+ end
+ file:close()
+ assert(os.rename(fname_tmp, keyset.filename))
+end
+
+-- Search the values of a table and return the corrseponding key (or nil).
+local function table_search(t, val)
+ for k, v in pairs(t) do
+ if v == val then
+ return k
+ end
+ end
+ return nil
+end
+
+-- For each RR, parse .state and .timer from .comment.
+local function keyset_parse_comments(tas, default_state)
+ for _, ta in pairs(tas) do
+ ta.state = default_state
+ if ta.comment then
+ string.gsub(ta.comment, '^%s*(%a+):(%d*)', function (state, time)
+ if table_search(key_state, state) then
+ ta.state = state
+ end
+ ta.timer = tonumber(time) -- nil on failure
+ end)
+ ta.comment = nil
+ end
+ end
+ return tas
+end
+
+-- Read keyset from a file xor a string. (This includes the key states and timers.)
+local function keyset_read(path, str)
+ if (path == nil) == (str == nil) then -- exactly one of them must be nil
+ return nil, "internal ERROR: incorrect call to TA's keyset_read"
+ end
+ -- First load the regular entries, trusting them.
+ local zonefile = require('zonefile')
+ local tas, err
+ if path ~= nil then
+ tas, err = zonefile.file(path)
+ else
+ tas, err = zonefile.string(str)
+ end
+ if not tas then
+ return tas, err
+ end
+ keyset_parse_comments(tas, key_state.Valid)
+
+ -- The untrusted keys are commented out but important to load.
+ local line_iter
+ if path ~= nil then
+ line_iter = io.lines(path)
+ else
+ line_iter = string.gmatch(str, "[^\n]+")
+ end
+ for line in line_iter do
+ if line:sub(1, 2) == '; ' then
+ -- Ignore the line if it fails to parse including recognized .state.
+ local l_set = zonefile.string(line:sub(3))
+ if l_set and l_set[1] then
+ keyset_parse_comments(l_set)
+ if l_set[1].state then
+ table.insert(tas, l_set[1])
+ end
+ end
+ end
+ end
+
+ -- Fill tas[*].key_tag
+ for _, ta in pairs(tas) do
+ local ta_keytag = C.kr_dnssec_key_tag(ta.type, ta.rdata, #ta.rdata)
+ if not (ta_keytag >= 0 and ta_keytag <= 65535) then
+ return nil, string.format('invalid key: "%s": %s',
+ kres.rr2str(ta), ffi.string(C.knot_strerror(ta_keytag)))
+ end
+ ta.key_tag = ta_keytag
+ end
+
+ -- Fill tas.owner
+ if not tas[1] then
+ return nil, "empty TA set"
+ end
+ local owner = tas[1].owner
+ for _, ta in ipairs(tas) do
+ if ta.owner ~= owner then
+ return nil, string.format("do not mix %s and %s TAs in single file/string",
+ kres.dname2str(ta.owner), kres.dname2str(owner))
+ end
+ end
+ tas.owner = owner
+
+ return tas
+end
+
+-- Replace current TAs for given owner by the "trusted" ones from passed keyset.
+-- Return true iff no TA errored out and at least one is in VALID state.
+local function keyset_publish(keyset)
+ local store = kres.context().trust_anchors
+ local count = 0
+ local has_error = false
+ C.kr_ta_del(store, keyset.owner)
+ for _, ta in ipairs(keyset) do
+ -- Key MAY be used as a TA only in these two states (RFC5011, 4.2)
+ if ta.state == key_state.Valid or ta.state == key_state.Missing then
+ if C.kr_ta_add(store, ta.owner, ta.type, ta.ttl, ta.rdata, #ta.rdata) == 0 then
+ count = count + 1
+ else
+ ta.state = 'ERROR'
+ has_error = true
+ end
+ end
+ end
+ if count == 0 then
+ warn('[ ta ] ERROR: no anchors are trusted for ' ..
+ kres.dname2str(keyset.owner) .. ' !')
+ end
+ return count > 0 and not has_error
+end
+
+local function add_file(path, unmanaged)
+ local managed = not unmanaged
+ if not ta_update then
+ modules.load('ta_update')
+ end
+ if managed then
+ if not io.open(path .. '.lock', 'w') then
+ error("[ ta ] ERROR: write access needed to keyfile dir '"..path.."'")
+ end
+ os.remove(path .. ".lock")
+ end
+
+ -- Bootstrap TA for root zone if keyfile doesn't exist
+ if managed and not io.open(path, 'r') then
+ if trust_anchors.keysets['\0'] then
+ error(string.format(
+ "[ ta ] keyfile '%s' doesn't exist and root key is already installed, "
+ .. "cannot bootstrap; provide a path to valid file with keys", path))
+ end
+ log("[ ta ] keyfile '%s': doesn't exist, bootstrapping", path);
+ local rrstr, msg = bootstrap(trust_anchors.bootstrap_url, trust_anchors.bootstrap_ca)
+ if not rrstr then
+ msg = msg .. '\n'
+ .. '[ ta ] Failed to bootstrap root trust anchors!'
+ error(msg)
+ end
+ print(msg)
+ bootstrap_write(rrstr, path)
+ -- continue as if the keyfile was there
+ end
+
+ -- Parse the file and check its sanity
+ local keyset, err = keyset_read(path)
+ if not keyset then
+ panic("[ ta ] ERROR: failed to read anchors from '%s' (%s)", path, err)
+ end
+ keyset.filename = path
+ keyset.managed = managed
+
+ local owner = keyset.owner
+ local owner_str = kres.dname2str(owner)
+ local keyset_orig = trust_anchors.keysets[owner]
+ if keyset_orig then
+ warn('[ ta ] warning: overriding previously set trust anchors for ' .. owner_str)
+ if keyset_orig.managed and ta_update then
+ ta_update.stop(owner)
+ end
+ end
+ trust_anchors.keysets[owner] = keyset
+
+ -- Replace the TA store used for validation
+ if keyset_publish(keyset) and verbose() then
+ log('[ ta ] installed trust anchors for domain ' .. owner_str .. ' are:\n'
+ .. trust_anchors.summary(owner))
+ end
+ -- TODO: if failed and for root, try to rebootstrap?
+
+ ta_update.start(owner, managed)
+end
+
+local function remove(zname)
+ local owner = kres.str2dname(zname)
+ if not trust_anchors.keysets[owner] then
+ return false
+ end
+
+ if ta_update then
+ ta_update.stop(owner)
+ end
+ trust_anchors.keysets[owner] = nil
+ local store = kres.context().trust_anchors
+ C.kr_ta_del(store, owner)
+ return true
+end
+
+local function ta_str(owner)
+ local owner_str = kres.dname2str(owner) .. ' '
+ local msg = ''
+ for _, nta in pairs(trust_anchors.insecure) do
+ if owner == kres.str2dname(nta) then
+ msg = owner_str .. 'is negative trust anchor\n'
+ end
+ end
+ if not trust_anchors.keysets[owner] then
+ if #msg > 0 then -- it is normal that NTA does not have explicit TA
+ return msg
+ else
+ return owner_str .. 'has no explicit trust anchors\n'
+ end
+ end
+ if #msg > 0 then
+ msg = msg .. 'WARNING! negative trust anchor also has an explicit TA\n'
+ end
+ for _, ta in ipairs(trust_anchors.keysets[owner]) do
+ msg = msg .. ta_rr_str(ta)
+ end
+ return msg
+end
+
+-- TA store management, for user docs see ../README.rst
+trust_anchors = {
+ -- [internal] table indexed by dname;
+ -- each item is a list of RRs and additionally contains:
+ -- - owner - that dname (for simplicity)
+ -- - [optional] filename in which to persist the state,
+ -- implying unmanaged TA if nil
+ -- The RR tables also contain some additional TA-specific fields.
+ keysets = {},
+
+ -- Documented properties:
+ insecure = {},
+
+ bootstrap_url = 'https://data.iana.org/root-anchors/root-anchors.xml',
+ bootstrap_ca = '@etc_dir@/icann-ca.pem',
+
+ -- Load keys from a file, 5011-managed by default.
+ -- If managed and the file doesn't exist, try bootstrapping the root into it.
+ add_file = add_file,
+ config = function() upgrade_required('trust_anchors.config was removed, use trust_anchors.add_file()') end,
+ remove = remove,
+
+ keyset_publish = keyset_publish,
+ keyset_write = keyset_write,
+ key_state = key_state,
+
+ -- Add DS/DNSKEY record(s) (unmanaged)
+ add = function (keystr)
+ local keyset, err = keyset_read(nil, keystr)
+ if keyset ~= nil then
+ local owner = keyset.owner
+ local owner_str = kres.dname2str(owner)
+ local keyset_orig = trust_anchors.keysets[owner]
+ -- Set up trust_anchors.keysets[owner]
+ if keyset_orig then
+ if keyset_orig.managed then
+ panic('[ ta ] it is impossible to add an unmanaged TA for zone '
+ .. owner_str .. ' which already has a managed TA')
+ end
+ warn('[ ta ] warning: extending previously set trust anchors for '
+ .. owner_str)
+ for _, ta in ipairs(keyset) do
+ table.insert(keyset_orig, ta)
+ end
+ end
+ -- Replace the TA store used for validation
+ if not keyset_publish(keyset) then
+ err = "when publishing the TA set"
+ -- trust_anchors.keysets[owner] was already updated to the
+ -- (partially) failing state, but I'm not sure how much to improve this
+ end
+ keyset.managed = false
+ trust_anchors.keysets[owner] = keyset
+
+ end
+ if verbose() or err then log('New TA state:\n' .. trust_anchors.summary()) end
+ if err then
+ panic('[ ta ] .add() failed: ' .. err)
+ end
+ end,
+
+ -- Negative TA management
+ set_insecure = function (list)
+ assert(type(list) == 'table', 'parameter must be list of domain names (e.g. {"a.test", "b.example"})')
+ local store = kres.context().negative_anchors
+ for i = 1, #list do
+ local dname = kres.str2dname(list[i])
+ if trust_anchors.keysets[dname] then
+ error('cannot add NTA '..list[i]..' because it is TA. Use trust_anchors.remove() instead')
+ end
+ end
+
+ C.kr_ta_clear(store)
+ for i = 1, #list do
+ local dname = kres.str2dname(list[i])
+ C.kr_ta_add(store, dname, kres.type.DS, 0, nil, 0)
+ end
+ trust_anchors.insecure = list
+ end,
+ -- Return textual representation of all TAs (incl. negative)
+ -- It's meant for human consumption.
+ summary = function (single_owner)
+ if single_owner then -- single domain
+ return ta_str(single_owner)
+ end
+
+ -- all domains
+ local msg = ''
+ local ta_count = 0
+ local seen = {}
+ for _, nta_str in pairs(trust_anchors.insecure) do
+ local owner = kres.str2dname(nta_str)
+ seen[owner] = true
+ msg = msg .. ta_str(owner)
+ end
+ for owner, _ in pairs(trust_anchors.keysets) do
+ if not seen[owner] then
+ ta_count = ta_count + 1
+ msg = msg .. ta_str(owner)
+ end
+ end
+ if ta_count == 0 then
+ msg = msg .. 'No valid trust anchors, DNSSEC validation is disabled\n'
+ end
+ return msg
+ end,
+}
+
+-- Syntactic sugar for TA store
+setmetatable(trust_anchors, {
+ __newindex = function (t,k,v)
+ if k == 'file' then
+ upgrade_required('trust_anchors.file was removed, use trust_anchors.add_file()')
+ elseif k == 'negative' then
+ upgrade_required('trust_anchors.negative was removed, use trust_anchors.set_insecure()')
+ elseif k == 'keyfile_default' then
+ upgrade_required('trust_anchors.keyfile_default is now compiled in, see trust_anchors.remove()')
+ else rawset(t, k, v) end
+ end,
+})
+
+return trust_anchors
diff --git a/daemon/lua/trust_anchors.rst b/daemon/lua/trust_anchors.rst
new file mode 100644
index 0000000..ddd0313
--- /dev/null
+++ b/daemon/lua/trust_anchors.rst
@@ -0,0 +1,123 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. warning:: Options in this section are intended only for expert users and
+ normally should not be needed.
+
+Since version 4.0, **DNSSEC validation is enabled by default**.
+If you really need to turn DNSSEC off and are okay with lowering security of your
+system by doing so, add the following snippet to your configuration file.
+
+.. code-block:: lua
+
+ -- turns off DNSSEC validation
+ trust_anchors.remove('.')
+
+The resolver supports DNSSEC including :rfc:`5011` automated DNSSEC TA updates
+and :rfc:`7646` negative trust anchors. Depending on your distribution, DNSSEC
+trust anchors should be either maintained in accordance with the distro-wide
+policy, or automatically maintained by the resolver itself.
+
+In practice this means that you can forget about it and your favorite Linux
+distribution will take care of it for you.
+
+Following functions allow to modify DNSSEC configuration *if you really have to*:
+
+
+.. function:: trust_anchors.add_file(keyfile[, readonly = false])
+
+ :param string keyfile: path to the file.
+ :param readonly: if true, do not attempt to update the file.
+
+ The format is standard zone file, though additional information may be persisted in comments.
+ Either DS or DNSKEY records can be used for TAs.
+ If the file does not exist, bootstrapping of *root* TA will be attempted.
+ If you want to use bootstrapping, install `lua-http`_ library.
+
+ Each file can only contain records for a single domain.
+ The TAs will be updated according to :rfc:`5011` and persisted in the file (if allowed).
+
+ Example output:
+
+ .. code-block:: lua
+
+ > trust_anchors.add_file('root.key')
+ [ ta ] new state of trust anchors for a domain:
+ . 165488 DS 19036 8 2 49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5
+ nil
+
+ [ ta ] key: 19036 state: Valid
+
+.. function:: trust_anchors.remove(zonename)
+
+ Remove specified trust anchor from trusted key set. Removing trust anchor for the root zone effectivelly disables DNSSEC validation (unless you configured another trust anchor).
+
+ .. code-block:: lua
+
+ > trust_anchors.remove('.')
+ true
+
+ If you want to disable DNSSEC validation for a particular domain but keep it enabled for the rest of DNS tree, use :func:`trust_anchors.set_insecure`.
+
+.. envvar:: trust_anchors.hold_down_time = 30 * day
+
+ :return: int (default: 30 * day)
+
+ Modify RFC5011 hold-down timer to given value. Intended only for testing purposes. Example: ``30 * sec``
+
+.. envvar:: trust_anchors.refresh_time = nil
+
+ :return: int (default: nil)
+
+ Modify RFC5011 refresh timer to given value (not set by default), this will force trust anchors
+ to be updated every N seconds periodically instead of relying on RFC5011 logic and TTLs.
+ Intended only for testing purposes.
+ Example: ``10 * sec``
+
+.. envvar:: trust_anchors.keep_removed = 0
+
+ :return: int (default: 0)
+
+ How many ``Removed`` keys should be held in history (and key file) before being purged.
+ Note: all ``Removed`` keys will be purged from key file after restarting the process.
+
+
+.. function:: trust_anchors.set_insecure(nta_set)
+
+ :param table nta_list: List of domain names (text format) representing NTAs.
+
+ When you use a domain name as an *negative trust anchor* (NTA), DNSSEC validation will be turned off at/below these names.
+ Each function call replaces the previous NTA set. You can find the current active set in ``trust_anchors.insecure`` variable.
+ If you want to disable DNSSEC validation completely use :func:`trust_anchors.remove` function instead.
+
+ Example output:
+
+ .. code-block:: lua
+
+ > trust_anchors.set_insecure({ 'bad.boy', 'example.com' })
+ > trust_anchors.insecure
+ [1] => bad.boy
+ [2] => example.com
+
+ .. warning:: If you set NTA on a name that is not a zone cut,
+ it may not always affect names not separated from the NTA by a zone cut.
+
+.. function:: trust_anchors.add(rr_string)
+
+ :param string rr_string: DS/DNSKEY records in presentation format (e.g. ``. 3600 IN DS 19036 8 2 49AAC11...``)
+
+ Inserts DS/DNSKEY record(s) into current keyset. These will not be managed or updated, use it only for testing
+ or if you have a specific use case for not using a keyfile.
+
+ .. note:: Static keys are very error-prone and should not be used in production. Use :func:`trust_anchors.add_file` instead.
+
+ Example output:
+
+ .. code-block:: lua
+
+ > trust_anchors.add('. 3600 IN DS 19036 8 2 49AAC11...')
+
+.. function:: trust_anchors.summary()
+
+ Return string with summary of configured DNSSEC trust anchors, including negative TAs.
+
+.. _lua-http: https://luarocks.org/modules/daurnimator/http
diff --git a/daemon/lua/trust_anchors.test/bootstrap.test.lua b/daemon/lua/trust_anchors.test/bootstrap.test.lua
new file mode 100644
index 0000000..56c5add
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/bootstrap.test.lua
@@ -0,0 +1,112 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+modules.load('ta_update')
+
+-- check prerequisites
+local has_http = pcall(require, 'kres_modules.http') and pcall(require, 'http.request')
+if not has_http then
+ -- skipping bootstrap tests because http module is not not installed
+ os.exit(77)
+end
+
+local cqueues = require("cqueues")
+local socket = require("cqueues.socket")
+
+-- unload modules which are not related to this test
+if ta_signal_query then
+ modules.unload('ta_signal_query')
+end
+if priming then
+ modules.unload('priming')
+end
+if detect_time_skew then
+ modules.unload('detect_time_skew')
+end
+
+-- Self-checks on globals
+assert(help() ~= nil)
+assert(worker.id ~= nil)
+-- Self-checks on facilities
+assert(worker.stats() ~= nil)
+assert(net.interfaces() ~= nil)
+-- Self-checks on loaded stuff
+assert(#modules.list() > 0)
+-- Self-check timers
+ev = event.recurrent(1 * sec, function () return 1 end)
+event.cancel(ev)
+ev = event.after(0, function () return 1 end)
+
+
+-- do not attempt to contact outside world using DNS, operate only on cache
+net.ipv4 = false
+net.ipv6 = false
+-- do not listen, test is driven by config code
+env.KRESD_NO_LISTEN = true
+
+-- start test webserver
+local function start_webserver()
+ -- srvout = io.popen('luajit webserv.lua')
+ -- TODO
+ os.execute('luajit webserv.lua &')
+ -- assert(srvout, 'failed to start webserver')
+end
+
+local function wait_for_webserver()
+ local starttime = os.time()
+ local connected = false
+ while not connected and os.difftime(os.time(), starttime) < 10 do
+ local con = socket.connect("localhost", 8080)
+ connected, msg = pcall(con.connect, con, 3)
+ cqueues.sleep (0.3)
+ end
+ assert(connected, string.format('unable to connect to web server: %s', msg))
+end
+
+local host = 'https://localhost:8080/'
+-- avoid interference with configured keyfile_default
+trust_anchors.remove('.')
+
+local function test_err_cert()
+ trust_anchors.bootstrap_ca = 'x509/wrongca.pem'
+ trust_anchors.bootstrap_url = host .. 'ok1.xml'
+ boom(trust_anchors.add_file, {'ok1.keys'},
+ 'fake server certificate is detected')
+end
+
+local function test_err_xml(testname, testdesc)
+ return function()
+ trust_anchors.bootstrap_ca = 'x509/ca.pem'
+ trust_anchors.bootstrap_url = host .. testname .. '.xml'
+ boom(trust_anchors.add_file, {testname .. '.keys'}, testdesc)
+ end
+end
+
+-- dumb test, right now it cannot check content of keys because
+-- it does not get written until refresh fetches DNSKEY from network
+-- (and bypassing network using policy bypasses also validation
+-- so it does not test anything)
+local function test_ok_xml(testname, testdesc)
+ return function()
+ trust_anchors.bootstrap_url = host .. testname .. '.xml'
+ trust_anchors.remove('.')
+ same(trust_anchors.add_file(testname .. '.keys'), nil, testdesc)
+ end
+end
+
+return {
+ start_webserver,
+ wait_for_webserver,
+ test_err_cert,
+ test_err_xml('err_attr_extra_attr', 'bogus TA XML with an extra attribute'),
+ test_err_xml('err_attr_validfrom_invalid', 'bogus TA XML with invalid validFrom value'),
+ test_err_xml('err_attr_validfrom_missing', 'bogus TA XML without mandatory validFrom attribute'),
+ test_err_xml('err_elem_extra', 'bogus TA XML with an extra element'),
+ test_err_xml('err_elem_missing', 'bogus TA XML without mandatory element'),
+ test_err_xml('err_multi_ta', 'bogus TA XML with multiple TAs'),
+ test_err_xml('unsupp_nonroot', 'unsupported TA XML for non-root zone'),
+ test_err_xml('unsupp_xml_v11', 'unsupported TA XML with XML v1.1'),
+ test_err_xml('ok0_badtimes', 'TA XML with no valid keys'),
+ test_ok_xml('ok1_expired1', 'TA XML with 1 valid and 1 expired key'),
+ test_ok_xml('ok1_notyet1', 'TA XML with 1 valid and 1 not yet valid key'),
+ test_ok_xml('ok1', 'TA XML with 1 valid key'),
+ test_ok_xml('ok2', 'TA XML with 2 valid keys'),
+}
diff --git a/daemon/lua/trust_anchors.test/err_attr_extra_attr.xml b/daemon/lua/trust_anchors.test/err_attr_extra_attr.xml
new file mode 100644
index 0000000..2a87957
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/err_attr_extra_attr.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="FC4A93EC-9F4E-4597-A766-AD6723E4A56E" source="https://localhost/err_attr_extra_attr.xml">
+<Zone>.</Zone>
+<KeyDigest unknownattr="test" id="Kjqmt7v" validFrom="2010-07-15T00:00:00+00:00" validUntil="2019-01-11T00:00:00+00:00">
+<KeyTag>19036</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5</Digest>
+</KeyDigest>
+<KeyDigest id="Klajeyz" validFrom="2017-02-02T00:00:00+00:00">
+<KeyTag>20326</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/err_attr_validfrom_invalid.xml b/daemon/lua/trust_anchors.test/err_attr_validfrom_invalid.xml
new file mode 100644
index 0000000..5a4c68c
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/err_attr_validfrom_invalid.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="ABD668AB-52DF-4A59-80E3-16CE6341BC55" source="https://localhost/err_attr_validfrom_invalid.xml">
+<Zone>.</Zone>
+<KeyDigest id="Kjqmt7v" validFrom="2010-07-32T00:00:00+00:00" validUntil="2019-01-11T00:00:00+00:00">
+<KeyTag>19036</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5</Digest>
+</KeyDigest>
+<KeyDigest id="Klajeyz" validFrom="2017-02-02T00:00:00+00:00">
+<KeyTag>20326</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/err_attr_validfrom_missing.xml b/daemon/lua/trust_anchors.test/err_attr_validfrom_missing.xml
new file mode 100644
index 0000000..1261b09
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/err_attr_validfrom_missing.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="3513058C-4041-40CC-AF0A-D3CCD70F962B" source="https://localhost/err_attr_validfrom_missing.xml">
+<Zone>.</Zone>
+<KeyDigest id="Kjqmt7v" validUntil="2019-01-11T00:00:00+00:00">
+<KeyTag>19036</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5</Digest>
+</KeyDigest>
+<KeyDigest id="Klajeyz" validFrom="2017-02-02T00:00:00+00:00">
+<KeyTag>20326</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/err_elem_extra.xml b/daemon/lua/trust_anchors.test/err_elem_extra.xml
new file mode 100644
index 0000000..150a3b1
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/err_elem_extra.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="B1854D58-1867-4FA7-872F-0099D394114D" source="https://localhost/err_elem_extra.xml">
+<Zone>.</Zone>
+<KeyDigest id="Kjqmt7v" validFrom="2010-07-15T00:00:00+00:00" validUntil="2019-01-11T00:00:00+00:00">
+<KeyTag>19036</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5</Digest>
+</KeyDigest>
+<KeyDigest id="Klajeyz" validFrom="2017-02-02T00:00:00+00:00">
+<KeyTag>20326</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</Digest>
+<UnknownElement>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</UnknownElement>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/err_elem_missing.xml b/daemon/lua/trust_anchors.test/err_elem_missing.xml
new file mode 100644
index 0000000..899e1d0
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/err_elem_missing.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="BB074095-3A42-4B13-9CC1-CFFF644D4D54" source="https://localhost/err_elem_missing.xml">
+<Zone>.</Zone>
+<KeyDigest id="Kjqmt7v" validFrom="2010-07-15T00:00:00+00:00" validUntil="2019-01-11T00:00:00+00:00">
+<KeyTag>19036</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5</Digest>
+</KeyDigest>
+<KeyDigest id="Klajeyz" validFrom="2017-02-02T00:00:00+00:00">
+<KeyTag>20326</KeyTag>
+<Algorithm>8</Algorithm>
+<!-- this element is missing: DigestType>2</DigestType-->
+<Digest>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/err_multi_ta.xml b/daemon/lua/trust_anchors.test/err_multi_ta.xml
new file mode 100644
index 0000000..20cd73f
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/err_multi_ta.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="9DCE46E1-FC78-48E1-81B5-94E328790BB5" source="https://localhost/err_multi_ta.xml">
+<Zone>.</Zone>
+<KeyDigest id="1" validFrom="2000-02-02T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+</TrustAnchor>
+<TrustAnchor id="9DCE46E1-FC78-48E1-81B5-94E328790BB5" source="https://localhost/err_multi_ta.xml">
+<Zone>test.</Zone>
+<KeyDigest id="2" validFrom="2000-02-02T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/ok0_badtimes.xml b/daemon/lua/trust_anchors.test/ok0_badtimes.xml
new file mode 100644
index 0000000..4535a41
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/ok0_badtimes.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="EDEDAA08-D2A0-421E-81DC-AF11F5A0CDCD" source="https://localhost/ok0_badtimes.xml">
+<Zone>.</Zone>
+<KeyDigest id="E" validFrom="2000-01-01T00:00:00+00:00" validUntil="2000-01-01T00:00:00+00:00">
+<KeyTag>1</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE</Digest>
+</KeyDigest>
+<KeyDigest id="F" validFrom="2001-01-01T00:00:00+00:00" validUntil="2001-01-01T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/ok1.xml b/daemon/lua/trust_anchors.test/ok1.xml
new file mode 100644
index 0000000..117495c
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/ok1.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="82E6CB77-12DF-4E61-BF49-367FB95A8BAA" source="https://localhost/ok1.xml">
+<Zone>.</Zone>
+<KeyDigest id="2" validFrom="2000-02-02T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/ok1_expired1.xml b/daemon/lua/trust_anchors.test/ok1_expired1.xml
new file mode 100644
index 0000000..f1269da
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/ok1_expired1.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="68463155-A857-4C7E-BCA6-2F6CC2EAC1BE" source="https://localhost/ok1_expired1.xml">
+<Zone>.</Zone>
+<KeyDigest id="F" validFrom="1990-01-01T00:00:00+00:00" validUntil="2000-01-01T00:00:00+00:00">
+<KeyTag>1</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF</Digest>
+</KeyDigest>
+<KeyDigest id="1" validFrom="2000-01-01T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/ok1_notyet1.xml b/daemon/lua/trust_anchors.test/ok1_notyet1.xml
new file mode 100644
index 0000000..7b5881b
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/ok1_notyet1.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="507B39D5-049E-467C-9E9A-F5BE597C9DDA" source="https://localhost/ok1_notyet1.xml">
+<Zone>.</Zone>
+<KeyDigest id="1" validFrom="2010-07-15T00:00:00+00:00">
+<KeyTag>1</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+<KeyDigest id="2" validFrom="2050-12-31T23:59:59+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/ok2.xml b/daemon/lua/trust_anchors.test/ok2.xml
new file mode 100644
index 0000000..149f6b5
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/ok2.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="1DECEB91-0591-44A1-95CF-1788337514B8" source="https://localhost/ok2.xml">
+<Zone>.</Zone>
+<KeyDigest id="K1" validFrom="2010-07-15T00:00:00+00:00">
+<KeyTag>1</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+<KeyDigest id="K2" validFrom="2011-02-02T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>2222222222222222222222222222222222222222222222222222222222222222</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/regen.sh b/daemon/lua/trust_anchors.test/regen.sh
new file mode 100755
index 0000000..9e7dac1
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/regen.sh
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+for F in *.xml; do sed -i "s/TrustAnchor id=\"[^\"]*\"/TrustAnchor id=\"$(uuidgen | tr '[[:lower:]]' '[[:upper:]]')\"/" $F; done
+for F in *.xml; do sed -i "s#source=\"[^\"]*\"#source=\"https://localhost/$F\"#" $F; done
diff --git a/daemon/lua/trust_anchors.test/root.keys b/daemon/lua/trust_anchors.test/root.keys
new file mode 100644
index 0000000..e292b5a
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/root.keys
@@ -0,0 +1 @@
+. IN DS 20326 8 2 E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D
diff --git a/daemon/lua/trust_anchors.test/ta.test.lua b/daemon/lua/trust_anchors.test/ta.test.lua
new file mode 100644
index 0000000..395434d
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/ta.test.lua
@@ -0,0 +1,85 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+trust_anchors.remove('.')
+
+local ffi = require('ffi')
+
+-- count warning messages
+warn_msg = {}
+overriding_msg="[ ta ] warning: overriding previously set trust anchors for ."
+warn_msg[overriding_msg] = 0
+function warn(fmt, ...)
+ msg = string.format(fmt, ...)
+ if warn_msg[msg] ~= nil then
+ warn_msg[msg] = warn_msg[msg] + 1
+ end
+end
+
+-- Test that adding a revoked DNSKEY is refused.
+local function test_revoked_key()
+ local ta_c = kres.context().trust_anchors
+ same(ffi.C.kr_ta_del(ta_c, '\0'), 0, 'remove root TAs if any')
+ -- same() doesn't consider nil and typed NULL pointer equal, so we work around:
+ same(ffi.C.kr_ta_get(ta_c, '\0') == nil, true, 'no TA for root is used')
+ local key_crypto = 'AwEAAagAIKlVZrpC6Ia7gEzahOR+9W29euxhJhVVLOyQbSEW0O8gcCjFFV'
+ .. 'QUTf6v58fLjwBd0YI0EzrAcQqBGCzh/RStIoO8g0NfnfL2MTJRkxoXbfDaUeVPQuYEhg37'
+ .. 'NZWAJQ9VnMVDxP/VHL496M/QZxkjf5/Efucp2gaDX6RS6CXpoY68LsvPVjR0ZSwzz1apAz'
+ .. 'vN9dlzEheX7ICJBBtuA6G3LQpzW5hOA2hzCTMjJPJ8LbqF6dsV6DoBQzgul0sGIcGOYl7O'
+ .. 'yQdXfZ57relSQageu+ipAdTTJ25AsRTAoub8ONGcLmqrAmRLKBP1dfwhYB4N7knNnulqQxA+Uk1ihz0='
+ boom(trust_anchors.add, { '. 3600 DNSKEY 385 3 8 ' .. key_crypto }, 'refuse revoked key')
+ same(ffi.C.kr_ta_get(ta_c, '\0') == nil, true, 'no TA for root is used')
+ -- Test that we don't have another problem in the key
+ trust_anchors.add('. 3600 DNSKEY 257 3 8 ' .. key_crypto)
+ local root_ta = ffi.C.kr_ta_get(ta_c, '\0')
+ same(root_ta == nil, false, 'we got non-NULL TA RRset')
+ same(root_ta.rrs.count, 1, 'the root TA set contains one RR')
+end
+
+local function test_remove()
+ -- uses root key from the previous test
+ assert(trust_anchors.keysets['\0'], 'root key must be there from previous test')
+ local ta_c = kres.context().trust_anchors
+ local root_ta = ffi.C.kr_ta_get(ta_c, '\0')
+ assert(root_ta ~= nil, 'we got non-NULL TA RRset')
+ assert(root_ta.rrs.count, 1, 'we have a root TA set to be deleted')
+
+ trust_anchors.remove('.')
+
+ same(trust_anchors.keysets['\0'], nil, 'Lua interface does not have the removed key')
+ root_ta = ffi.C.kr_ta_get(ta_c, '\0')
+ same(root_ta == nil, true, 'C interface does not have the removed key')
+end
+
+local function test_add_file()
+ boom(trust_anchors.add_file, {'nonwriteable/root.keys', false},
+ "Managed trust anchor in non-writeable directory")
+
+ boom(trust_anchors.add_file, {'nonexist.keys', true},
+ "Nonexist unmanaged trust anchor file")
+
+ is(warn_msg[overriding_msg], 0, "No override warning messages at start of test")
+ trust_anchors.add_file('root.keys', true)
+ trust_anchors.add_file('root.keys', true)
+ is(warn_msg[overriding_msg], 1, "Warning message when override trust anchors")
+
+ is(trust_anchors.keysets['\0'][1].key_tag, 20326,
+ "Loaded KeyTag from root.keys")
+end
+
+local function test_nta()
+ assert(trust_anchors.keysets['\0'], 'root key must be there from previous tests')
+
+ trust_anchors.set_insecure({'example.com'})
+ is(trust_anchors.insecure[1], 'example.com', 'Add example.com to NTA list')
+ boom(trust_anchors.set_insecure, {{'.'}}, 'Got error when adding TA . to NTA list')
+ is(#trust_anchors.insecure, 1, 'Check one item in NTA list')
+ is(trust_anchors.insecure[1], 'example.com', 'Check previous NTA list')
+end
+
+return {
+ test_revoked_key,
+ test_remove,
+ test_add_file,
+ test_nta,
+}
+
diff --git a/daemon/lua/trust_anchors.test/unsupp_nonroot.xml b/daemon/lua/trust_anchors.test/unsupp_nonroot.xml
new file mode 100644
index 0000000..51b3c0a
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/unsupp_nonroot.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="8449BFB8-FD6C-4082-B0FE-1A3E3399203B" source="https://localhost/unsupp_nonroot.xml">
+<Zone>test.</Zone>
+<KeyDigest id="2" validFrom="2000-02-02T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/unsupp_xml_v11.xml b/daemon/lua/trust_anchors.test/unsupp_xml_v11.xml
new file mode 100644
index 0000000..87a4b57
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/unsupp_xml_v11.xml
@@ -0,0 +1,10 @@
+<?xml version="1.1" encoding="UTF-8"?>
+<TrustAnchor id="3612AE1C-E8F3-4FD8-B8CD-96C7FDACC7A5" source="https://localhost/unsupp_xml_v11.xml">
+<Zone>.</Zone>
+<KeyDigest id="2" validFrom="2000-02-02T00:00:00+00:00">
+<KeyTag>2</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>1111111111111111111111111111111111111111111111111111111111111111</Digest>
+</KeyDigest>
+</TrustAnchor>
diff --git a/daemon/lua/trust_anchors.test/webserv.lua b/daemon/lua/trust_anchors.test/webserv.lua
new file mode 100644
index 0000000..c108bba
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/webserv.lua
@@ -0,0 +1,236 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+-- This is a module that does the heavy lifting to provide an HTTP/2 enabled
+-- server that supports TLS by default and provides endpoint for other modules
+-- in order to enable them to export restful APIs and websocket streams.
+-- One example is statistics module that can stream live metrics on the website,
+-- or publish metrics on request for Prometheus scraper.
+local http_server = require('http.server')
+local http_headers = require('http.headers')
+local http_websocket = require('http.websocket')
+local http_util = require "http.util"
+local x509, pkey = require('openssl.x509'), require('openssl.pkey')
+
+-- Module declaration
+local M = {}
+
+-- Export HTTP service endpoints
+M.endpoints = {
+ ['/'] = {'text/html', 'test'},
+}
+
+-- Serve known requests, for methods other than GET
+-- the endpoint must be a closure and not a preloaded string
+local function serve(endpoints, h, stream)
+ local hsend = http_headers.new()
+ local path = h:get(':path')
+ local entry = endpoints[path]
+ if not entry then -- Accept top-level path match
+ entry = endpoints[path:match '^/[^/?]*']
+ end
+ -- Unpack MIME and data
+ local data, mime, ttl, err
+ if entry then
+ mime = entry[1]
+ data = entry[2]
+ ttl = entry[4]
+ end
+ -- Get string data out of service endpoint
+ if type(data) == 'function' then
+ local set_mime, set_ttl
+ data, err, set_mime, set_ttl = data(h, stream)
+ -- Override default endpoint mime/TTL
+ if set_mime then mime = set_mime end
+ if set_ttl then ttl = set_ttl end
+ -- Handler doesn't provide any data
+ if data == false then return end
+ if type(data) == 'number' then return tostring(data), err end
+ -- Methods other than GET require handler to be closure
+ elseif h:get(':method') ~= 'GET' then
+ return '501', ''
+ end
+ if not mime or type(data) ~= 'string' then
+ return '404', ''
+ else
+ -- Serve content type appropriately
+ hsend:append(':status', '200')
+ hsend:append('content-type', mime)
+ hsend:append('content-length', tostring(#data))
+ if ttl then
+ hsend:append('cache-control', string.format('max-age=%d', ttl))
+ end
+ assert(stream:write_headers(hsend, false))
+ assert(stream:write_chunk(data, true))
+ end
+end
+
+-- Web server service closure
+local function route(endpoints)
+ return function (_, stream)
+ -- HTTP/2: We're only permitted to send in open/half-closed (remote)
+ local connection = stream.connection
+ if connection.version >= 2 then
+ if stream.state ~= 'open' and stream.state ~= 'half closed (remote)' then
+ return
+ end
+ end
+ -- Start reading headers
+ local h = assert(stream:get_headers())
+ local m = h:get(':method')
+ local path = h:get(':path')
+ -- Upgrade connection to WebSocket
+ local ws = http_websocket.new_from_stream(stream, h)
+ if ws then
+ assert(ws:accept { protocols = {'json'} })
+ -- Continue streaming results to client
+ local ep = endpoints[path]
+ local cb = ep[3]
+ if cb then
+ cb(h, ws)
+ end
+ ws:close()
+ return
+ else
+ local ok, err, reason = http_util.yieldable_pcall(serve, endpoints, h, stream)
+ if not ok or err then
+ print(string.format('%s err %s %s: %s (%s)', os.date(), m, path, err or '500', reason))
+ -- Method is not supported
+ local hsend = http_headers.new()
+ hsend:append(':status', err or '500')
+ if reason then
+ assert(stream:write_headers(hsend, false))
+ assert(stream:write_chunk(reason, true))
+ else
+ assert(stream:write_headers(hsend, true))
+ end
+ else
+ print(string.format('%s ok %s %s', os.date(), m, path))
+ end
+ end
+ end
+end
+
+-- @function Prefer HTTP/2 or HTTP/1.1
+local function alpnselect(_, protos)
+ for _, proto in ipairs(protos) do
+ if proto == 'h2' or proto == 'http/1.1' then
+ return proto
+ end
+ end
+ return nil
+end
+
+-- @function Create TLS context
+local function tlscontext(crt, key)
+ local http_tls = require('http.tls')
+ local ctx = http_tls.new_server_context()
+ if ctx.setAlpnSelect then
+ ctx:setAlpnSelect(alpnselect)
+ end
+ assert(ctx:setPrivateKey(key))
+ assert(ctx:setCertificate(crt))
+ return ctx
+end
+
+-- @function Listen on given HTTP(s) host
+function M.add_interface(conf)
+ local crt, key
+ if conf.tls ~= false then
+ assert(conf.cert, 'cert missing')
+ assert(conf.key, 'private key missing')
+ -- Check if a cert file was specified
+ -- Read x509 certificate
+ local f = io.open(conf.cert, 'r')
+ if f then
+ crt = assert(x509.new(f:read('*all')))
+ f:close()
+ -- Continue reading key file
+ if crt then
+ f = io.open(conf.key, 'r')
+ key = assert(pkey.new(f:read('*all')))
+ f:close()
+ end
+ end
+ -- Check loaded certificate
+ assert(crt and key,
+ string.format('failed to load certificate "%s"', conf.cert))
+ end
+ -- Compose server handler
+ local routes = route(conf.endpoints or M.endpoints)
+ -- Check if UNIX socket path is used
+ local addr_str
+ if not conf.path then
+ conf.host = conf.host or 'localhost'
+ conf.port = conf.port or 8453
+ addr_str = string.format('%s@%d', conf.host, conf.port)
+ else
+ if conf.host or conf.port then
+ error('either "path", or "host" and "port" must be provided')
+ end
+ addr_str = conf.path
+ end
+ -- Create TLS context and start listening
+ local s, err = http_server.listen {
+ -- cq = worker.bg_worker.cq,
+ host = conf.host,
+ port = conf.port,
+ path = conf.path,
+ v6only = conf.v6only,
+ unlink = conf.unlink,
+ reuseaddr = conf.reuseaddr,
+ reuseport = conf.reuseport,
+ client_timeout = conf.client_timeout or 5,
+ ctx = crt and tlscontext(crt, key),
+ tls = conf.tls,
+ onstream = routes,
+ -- Log errors, but do not throw
+ onerror = function(myserver, context, op, err, errno) -- luacheck: ignore 212
+ local msg = '[http] ' .. op .. ' on ' .. tostring(context) .. ' failed'
+ if err then
+ msg = msg .. ': ' .. tostring(err)
+ end
+ print(msg)
+ end,
+ }
+ -- Manually call :listen() so that we are bound before calling :localname()
+ if s then
+ err = select(2, s:listen())
+ end
+ assert(not err, string.format('failed to listen on %s: %s', addr_str, err))
+ return s
+end
+
+-- init
+local files = {
+ 'ok0_badtimes.xml',
+ 'ok1.xml',
+ 'ok1_expired1.xml',
+ 'ok1_notyet1.xml',
+ 'ok2.xml',
+ 'err_attr_validfrom_missing.xml',
+ 'err_attr_validfrom_invalid.xml',
+ 'err_attr_extra_attr.xml',
+ 'err_elem_missing.xml',
+ 'err_elem_extra.xml',
+ 'err_multi_ta.xml',
+ 'unsupp_nonroot.xml',
+ 'unsupp_xml_v11.xml'
+}
+
+-- Export static pages specified at command line
+for _, name in ipairs(files) do
+ local fd = io.open(name)
+ assert(fd, string.format('unable to open file "%s"', name))
+ M.endpoints['/' .. name] = { 'text/xml', fd:read('*a') }
+ fd:close()
+end
+
+local server = M.add_interface({
+ host = 'localhost',
+ port = 8080,
+ tls = true,
+ cert = 'x509/server.pem',
+ key = 'x509/server-key.pem'
+ })
+
+server:loop()
diff --git a/daemon/lua/trust_anchors.test/x509/ca-key.pem b/daemon/lua/trust_anchors.test/x509/ca-key.pem
new file mode 100644
index 0000000..2e95b23
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/ca-key.pem
@@ -0,0 +1,182 @@
+Public Key Info:
+ Public Key Algorithm: RSA
+ Key Security Level: High (3072 bits)
+
+modulus:
+ 00:9e:ee:f2:d8:41:ae:2c:93:8a:01:1f:88:5b:d6:85
+ 29:2f:91:9d:37:fc:35:88:7f:53:71:87:fc:17:71:e7
+ 15:57:06:2d:54:fb:19:98:80:82:ec:1a:99:2d:57:cb
+ 5f:dd:28:26:d8:95:fb:65:b2:be:e1:11:86:69:14:7e
+ 32:5c:c0:02:0b:5d:11:78:69:50:20:25:3e:15:fb:8a
+ 46:d1:83:f9:3b:84:46:9c:69:21:44:d5:09:1d:7a:04
+ cc:f3:6a:ea:4c:1b:da:7c:40:dd:1c:6f:f6:85:b4:ea
+ 75:98:34:79:11:fb:cf:d3:18:70:64:25:33:8a:31:b6
+ 93:67:d4:32:67:61:1c:d0:7b:85:61:54:c6:fb:51:b6
+ 87:1d:d4:b8:58:40:a9:c5:32:ce:e0:b9:90:37:0d:58
+ e4:33:70:c5:c5:91:f2:18:f5:e0:08:ad:17:8b:cf:72
+ f1:26:6c:9c:88:d2:9e:06:4c:02:5d:4e:7c:93:af:8d
+ 72:93:75:1d:60:0c:f7:34:09:a8:e6:f2:80:4a:14:81
+ 24:40:4b:45:19:85:2e:ad:8e:97:4c:ff:ec:d0:9f:e6
+ a0:b7:c0:a9:a0:ad:d2:02:2d:13:55:f3:df:f8:f9:f1
+ f3:3e:35:e9:08:2b:db:11:93:57:13:55:c6:ba:c6:d7
+ ff:7d:e1:fa:8c:47:5d:da:bf:31:56:80:aa:34:97:43
+ bb:9e:ff:d3:e6:13:a9:c2:99:49:c2:1e:da:f2:c7:d2
+ d6:f7:5f:70:36:91:2f:ea:36:e9:88:44:08:a3:1a:0a
+ c0:e0:4b:48:82:9a:c9:72:29:9c:09:24:63:b3:c2:9f
+ 2a:f6:e8:3a:c4:46:03:8d:70:ae:14:bb:3a:d6:c6:62
+ 93:24:7f:bc:0a:c8:a2:20:53:3c:9f:5c:15:45:05:3d
+ 1b:38:17:d4:fe:6b:6a:c2:16:f3:14:73:c2:c3:c7:36
+ e3:f1:f8:e5:28:84:4e:37:d4:68:e8:82:70:20:53:fc
+ 01:
+
+public exponent:
+ 01:00:01:
+
+private exponent:
+ 44:4a:68:0e:84:2a:52:fd:12:4f:69:3d:2e:38:fe:fe
+ b3:71:de:1c:30:42:d0:63:e5:76:e2:f7:6f:1b:82:2f
+ a9:34:fe:45:85:9f:79:e7:be:59:b5:14:1c:67:9c:fb
+ 94:0b:ac:a5:63:cc:a1:e6:2c:1e:89:69:37:bd:96:7c
+ 0d:5e:73:82:6e:7b:13:42:2d:2b:a2:d5:0a:9d:0a:cd
+ 63:39:51:de:40:f8:16:3d:16:0e:7d:7b:6d:2f:00:e1
+ 0f:b6:e0:f5:d3:02:0e:61:d0:a0:67:7b:85:f8:36:c6
+ 50:a0:3b:65:7e:cd:cd:e6:b2:64:55:97:cf:c9:8c:a9
+ c9:f3:63:b5:08:05:59:8f:b9:c0:18:ad:67:4f:b5:1e
+ 59:b3:0d:82:de:46:14:75:c0:6e:cf:4d:28:5a:93:d7
+ 7a:42:fa:b7:e9:fe:1c:bb:89:88:30:d7:ed:3b:36:28
+ 68:5a:42:e8:87:97:5f:1d:49:e6:cd:d2:b9:a2:b5:23
+ d8:df:5d:cf:c6:98:9a:e0:99:7a:33:52:75:22:ce:ca
+ 85:eb:d9:92:6a:d5:49:c0:cb:df:b1:a2:98:b5:6c:37
+ 85:c2:e1:6a:13:48:22:72:02:a7:e2:e0:f3:f3:0c:ed
+ 42:f6:83:ba:71:f0:ef:8f:ce:6a:59:30:be:9d:5f:23
+ 06:c3:0e:49:5c:8f:6a:8d:c2:c3:c5:07:45:55:78:f0
+ bd:29:01:cb:ac:ec:b1:40:7d:78:cc:4d:cb:f9:60:a4
+ a2:f5:aa:21:0b:3e:da:1b:d9:f0:99:19:44:57:21:09
+ ba:0f:f9:05:8e:ee:59:4f:59:08:b1:67:51:02:80:4e
+ 34:c7:5d:25:79:8c:84:f7:be:15:02:28:9c:f9:b9:ca
+ fc:6a:ed:d0:5f:df:be:ce:c4:96:63:23:2e:db:e1:85
+ 1e:45:16:2c:24:b0:5e:7a:62:bf:36:00:8b:c8:90:61
+ c2:68:4b:95:b0:ce:41:77:a3:a0:5d:09:72:01:a0:01
+
+
+prime1:
+ 00:ca:fe:eb:14:07:13:a9:ef:b6:d5:6c:52:02:39:b6
+ 6e:55:b6:dd:70:fc:c6:04:7c:07:81:9b:98:a4:da:db
+ f1:66:b8:33:91:fd:00:15:6e:72:0d:ab:0b:6f:be:34
+ c8:d9:82:58:7e:09:7f:e4:6f:c0:70:99:53:68:c7:53
+ d2:8f:97:22:f5:e8:e4:be:5f:e1:29:0f:27:a7:66:74
+ b2:cc:96:a1:d2:ca:2a:40:4b:70:cc:7a:16:4f:c9:4f
+ 49:16:11:d5:f8:da:f6:92:06:1c:45:c3:f8:17:c4:1d
+ 65:9a:2a:3f:33:be:33:f8:84:03:26:49:d8:52:25:f8
+ 19:ce:31:00:c0:b6:55:71:74:03:53:e8:0c:ef:85:64
+ 54:d4:8f:68:08:87:da:cb:9b:55:6a:2e:2b:c2:95:36
+ c4:dd:09:62:c0:6f:9e:e9:cc:ea:96:4e:e6:2d:6c:72
+ c1:54:92:11:29:91:af:4d:cd:08:7c:f8:6f:28:9d:ca
+ c5:
+
+prime2:
+ 00:c8:6e:b7:af:c3:c6:b9:df:49:ad:ea:b8:62:b7:43
+ e6:04:d9:5a:df:c3:f9:a3:0d:b5:e6:2d:9d:f7:c4:ff
+ 38:c0:cb:03:9c:c1:d1:6f:b4:fb:cf:81:c4:9e:94:2a
+ d5:e2:a1:77:a8:7b:8f:d1:34:7a:c2:f5:38:ec:0d:35
+ a0:5e:3c:af:e9:2d:f4:f9:32:ae:da:c1:1e:62:74:e5
+ ab:3d:3b:3d:d0:88:fc:53:59:0f:21:30:ed:24:ac:a7
+ 5a:a5:b7:f4:cc:5a:96:ad:79:a3:41:74:56:ad:39:14
+ 0a:27:a4:10:18:19:33:f2:1a:aa:b4:36:9d:fa:3f:fc
+ 71:42:1e:a0:96:8e:0f:de:46:87:ba:6c:38:17:d0:7e
+ c8:4a:cb:4a:29:1c:44:b9:88:29:c7:6f:b7:4f:3f:00
+ cd:0c:6b:0f:77:a1:5a:f1:80:21:91:b3:68:ca:0d:b5
+ c9:6d:04:f4:98:94:9f:09:f9:a8:58:ea:34:9c:d8:f0
+ 0d:
+
+coefficient:
+ 00:bf:7b:93:68:64:ea:5e:b5:f4:b6:8c:91:49:aa:2b
+ b0:a5:74:40:73:45:23:b6:74:ae:7a:55:ae:9d:8a:bb
+ 3b:6d:3a:7d:c4:7a:c0:82:7f:0e:ef:57:1c:86:e2:56
+ 30:5b:0c:d9:d1:52:cf:df:10:4f:c8:4a:75:b1:b8:b1
+ 59:9b:01:02:a2:4d:29:aa:63:e5:11:0a:17:ae:1e:79
+ ed:5d:10:fc:f0:8a:8d:f6:77:f8:78:17:1e:07:ee:d1
+ de:59:ed:d7:fb:94:bf:c9:7c:f7:f3:a0:8d:66:d3:94
+ 9a:7f:d1:7a:89:87:71:17:96:90:4e:be:7b:54:5e:51
+ 03:c6:35:af:5f:ea:5d:cc:31:ab:56:4b:75:6a:14:b6
+ c0:1a:bf:fb:e9:54:ba:ad:c3:52:e9:85:03:db:b2:e8
+ 0b:18:60:37:19:f9:07:87:e7:b2:d8:3a:0d:c9:d5:f0
+ f0:73:60:fc:9e:e0:9e:b1:ea:52:71:c7:fd:27:0a:22
+ 42:
+
+exp1:
+ 04:a5:69:04:00:55:76:e2:41:b1:08:d5:a7:af:62:79
+ 8c:04:af:74:d2:94:45:ae:01:0d:fa:5d:b8:08:3a:58
+ 80:1d:5f:30:cc:35:a0:47:f2:dc:55:39:e1:c8:dc:b4
+ 6c:26:0b:98:76:e7:32:77:4c:54:47:6e:1d:4b:d2:a3
+ 53:1e:06:72:d2:6d:c9:dd:af:ed:9c:a7:2f:b1:ac:a2
+ 1b:04:a7:97:87:81:08:0f:b1:f9:3c:22:1e:99:60:f3
+ 2f:4a:21:37:9c:eb:5f:d4:3b:f9:6c:ce:d4:dc:6c:3f
+ d3:13:7c:76:d6:b7:a1:cc:83:b5:f0:a2:be:de:97:9b
+ 1f:99:07:87:61:a4:fa:ff:c8:c3:b6:df:f4:eb:7c:ac
+ 64:61:13:e4:7e:17:87:e9:7a:3e:ff:e7:88:80:99:cc
+ 4f:b2:d3:4b:cc:42:3a:df:b1:ce:d6:e7:75:ca:b1:a5
+ b3:25:d4:b6:ba:da:e4:50:f9:0c:c3:32:e8:1f:14:71
+
+
+exp2:
+ 00:9d:9d:bb:a3:63:b0:96:20:8a:5f:52:f2:b6:e6:69
+ 65:ac:30:84:ee:ec:bd:16:45:44:e3:02:c2:73:c2:9d
+ f5:b2:5e:b3:b3:85:13:3e:e6:33:13:66:78:09:40:79
+ 43:03:5a:78:af:ac:a3:57:20:0e:dd:db:5b:6c:fd:a2
+ 4b:3f:70:37:e1:85:fb:5c:30:48:22:cc:b5:29:35:c6
+ 1a:58:27:8b:1f:bf:69:b5:dd:96:31:42:b9:6a:1a:bf
+ ec:5f:df:7e:89:69:3f:8e:a1:d6:09:36:04:a7:69:f8
+ 61:57:f5:03:96:ff:d2:c2:b3:c7:c3:ba:23:97:54:d4
+ 1e:f8:a0:ff:26:06:07:62:83:52:5e:fe:95:49:dc:f2
+ a6:6d:72:da:19:e4:1a:03:50:99:92:35:3f:10:f9:79
+ 96:c6:0a:36:fa:9b:8f:d9:d4:2a:11:da:e5:2f:e7:82
+ 2a:29:2a:39:72:f7:84:ed:a2:3f:89:d4:7b:95:50:5f
+ cd:
+
+
+Public Key PIN:
+ pin-sha256:u7TPTyh/innOijbJFG3Y4pWghApErLvhCQUZNXBlVFU=
+Public Key ID:
+ sha256:bbb4cf4f287f8a79ce8a36c9146dd8e295a0840a44acbbe10905193570655455
+ sha1:92b7d0c4d107e2a73f827b87866aef9ff4379cc8
+
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/daemon/lua/trust_anchors.test/x509/ca.pem b/daemon/lua/trust_anchors.test/x509/ca.pem
new file mode 100644
index 0000000..e3c3ca2
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/ca.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
diff --git a/daemon/lua/trust_anchors.test/x509/ca.tmpl b/daemon/lua/trust_anchors.test/x509/ca.tmpl
new file mode 100644
index 0000000..ed801af
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/ca.tmpl
@@ -0,0 +1,4 @@
+cn = Knot Resolver testing CA
+ca
+cert_signing_key
+expiration_days = -1
diff --git a/daemon/lua/trust_anchors.test/x509/gen.sh b/daemon/lua/trust_anchors.test/x509/gen.sh
new file mode 100755
index 0000000..7251f12
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/gen.sh
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# CA
+certtool --generate-privkey > ca-key.pem
+certtool --generate-self-signed --load-privkey ca-key.pem --template ca.tmpl --outfile ca.pem
+
+# server cert signed by CA above
+certtool --generate-privkey > server-key.pem
+certtool --generate-certificate --load-privkey server-key.pem --load-ca-certificate ca.pem --load-ca-privkey ca-key.pem --template server.tmpl --outfile server.pem
+
+# wrong CA - unrelated to others
+certtool --generate-privkey > wrongca-key.pem
+certtool --generate-self-signed --load-privkey wrongca-key.pem --template wrongca.tmpl --outfile wrongca.pem
diff --git a/daemon/lua/trust_anchors.test/x509/server-key.pem b/daemon/lua/trust_anchors.test/x509/server-key.pem
new file mode 100644
index 0000000..9eaef8a
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/server-key.pem
@@ -0,0 +1,182 @@
+Public Key Info:
+ Public Key Algorithm: RSA
+ Key Security Level: High (3072 bits)
+
+modulus:
+ 00:c3:46:2a:27:c8:39:e4:de:fa:24:45:6c:00:26:80
+ 61:ca:dd:a1:24:34:1b:93:1c:13:c8:5a:cf:af:6a:ef
+ 34:b9:89:83:02:76:51:ad:67:bf:ed:39:ee:0a:15:57
+ 91:6e:fa:68:60:78:22:62:fa:0a:55:12:03:b3:0c:8e
+ b4:ca:cd:2b:9d:a2:43:b5:5a:48:a0:3d:4a:1f:77:a4
+ a6:d4:87:eb:79:99:df:d4:b4:a3:cf:91:03:a0:c5:82
+ 39:f5:75:20:4b:90:b9:3b:72:65:a7:75:39:a6:62:58
+ 65:b0:9c:40:5c:c7:c4:4c:d3:1e:cc:74:18:74:15:23
+ 44:fd:51:59:b2:b7:70:95:6b:a0:be:d5:e4:72:59:2b
+ df:a5:a2:06:c8:e1:bd:17:80:25:b3:cf:8e:e8:ad:b2
+ f7:04:b1:9e:b8:72:0b:c5:dc:cd:a5:b6:f5:c9:1a:eb
+ 63:78:75:9c:5d:c5:03:a9:4b:7b:d6:cd:5c:5f:8d:2e
+ d0:b4:0d:96:55:c7:1e:c7:ac:13:46:b8:ec:9c:36:b9
+ 6a:1d:f0:7c:41:00:c6:bd:1f:81:7e:1d:48:1d:59:bc
+ e2:61:a6:d1:2d:52:10:3f:63:93:a9:14:d8:03:27:21
+ b0:d4:07:24:78:04:2b:86:c8:2b:0f:eb:a7:b3:3e:e2
+ 81:62:2a:4a:07:d9:fd:f6:77:7f:50:88:ee:bb:7d:31
+ 53:a8:97:bf:30:07:37:41:e9:52:16:15:74:a8:64:ed
+ 93:46:38:56:b4:89:d9:0c:62:4b:64:a9:64:ff:fc:9a
+ d6:19:a7:84:98:28:04:b4:95:76:ac:4a:42:6a:fb:67
+ 5b:b4:37:e6:e6:e2:52:d3:e9:38:8b:76:10:55:f1:e6
+ 8e:d8:73:eb:17:d1:54:41:d4:5b:76:2d:70:7f:f5:0d
+ 7d:d2:d6:f8:05:33:18:ab:dd:10:8a:5b:21:ee:3d:78
+ 9d:cd:c9:c0:c6:98:4e:a6:0a:41:f0:97:91:83:c2:c8
+ 4b:
+
+public exponent:
+ 01:00:01:
+
+private exponent:
+ 23:88:1f:e1:8f:40:61:91:e5:28:36:6d:99:75:68:04
+ e3:5a:02:99:48:d5:ff:a5:ab:3f:d8:ae:53:b7:fc:80
+ b6:85:fc:0d:b5:a3:d5:0e:bc:d0:98:aa:e4:b0:cf:77
+ 4a:1f:4c:60:c9:5b:50:71:38:f2:13:ce:12:85:65:6e
+ 26:3c:c1:03:f4:e3:a7:1b:1f:7d:f0:c9:0d:02:c3:36
+ 0c:14:13:57:d4:14:f3:6a:4f:28:54:b5:b9:4a:57:10
+ de:c6:0a:33:55:c9:2e:b4:f9:24:48:63:4e:10:35:0f
+ 83:dc:5a:a5:c7:3f:c3:ce:e2:9a:c7:41:2f:d6:2c:cd
+ bf:de:4e:99:03:61:fb:fe:52:88:86:f9:03:89:90:3f
+ 28:af:5b:d6:af:a4:ad:a3:06:b9:3a:3a:41:c2:61:7f
+ 2b:1e:7a:c8:0b:10:73:57:63:20:15:33:91:fd:50:f9
+ 8f:90:ae:fc:2c:fe:26:8e:f2:a0:ba:4b:65:a3:95:f1
+ d8:30:d4:fa:8d:12:1b:8b:58:1d:66:10:cd:41:22:1e
+ b0:7a:f4:e6:0f:76:3f:0a:0f:9c:44:e2:19:cf:c6:4d
+ de:3a:f4:96:70:c7:e6:2d:98:27:0e:ac:3b:32:41:37
+ 4e:05:b2:22:af:7b:38:92:16:40:fb:5c:96:b0:86:da
+ 96:c6:77:c3:66:78:07:80:5c:2a:46:dc:9a:bf:fc:0c
+ 2f:ee:f7:a1:b3:77:b4:50:75:a2:b7:36:9d:28:73:ee
+ 7a:ab:a6:0c:f6:92:18:8f:ff:16:28:90:7f:16:4f:f1
+ 6d:77:99:dd:a6:46:95:6a:6c:7a:15:48:53:b3:17:0b
+ 30:aa:0d:c8:68:33:2b:4d:40:da:74:cf:9b:73:1b:cd
+ 5d:f0:a9:d1:00:6f:db:de:55:ec:d4:24:96:bb:da:50
+ b4:d5:e1:87:35:5c:d4:50:c3:03:d5:d5:ee:03:65:4b
+ 68:9c:07:5c:59:28:78:bd:d1:4b:cb:8d:85:8b:5b:c1
+
+
+prime1:
+ 00:cc:8d:55:38:2d:57:cb:d2:4b:57:5b:3f:a2:6d:91
+ 4b:9c:54:29:98:9d:1d:bb:36:a6:e8:ba:e9:50:db:83
+ cf:c1:45:24:16:70:e5:51:40:eb:23:6b:fa:be:d5:d5
+ 00:27:ed:99:c7:7c:6b:16:79:77:0b:f3:ff:58:35:4e
+ 6c:58:68:51:d3:20:3c:57:b7:7d:bc:6b:fd:a7:c3:38
+ 9a:f2:7a:8a:b6:71:a1:6e:5e:64:7e:a8:c5:7c:58:70
+ fb:8d:63:b3:27:cc:1a:97:1e:04:da:d5:34:b5:d1:aa
+ f1:96:39:89:5e:cb:e7:75:ab:7e:ac:8c:fe:62:3e:cc
+ 93:66:88:d7:cd:c6:2d:db:9e:2f:f7:d1:6e:96:99:d2
+ 32:61:f4:9b:f5:48:fe:e7:90:b7:a2:ab:89:90:c1:ae
+ 67:5d:18:7a:c1:a3:84:97:09:47:13:df:d2:85:46:46
+ c7:77:3b:9f:b5:74:5c:f6:ec:a0:a7:66:0e:d1:d7:a4
+ e1:
+
+prime2:
+ 00:f4:63:70:fa:dd:7e:3d:1a:2b:5b:47:79:56:e9:c7
+ 7f:6b:50:41:60:45:af:59:e0:77:b2:76:4e:40:ff:f8
+ 55:9d:77:3b:c1:00:6a:c6:84:6a:09:a5:45:e6:fc:e6
+ e6:92:72:32:fc:93:8f:93:d9:db:fc:8c:43:d2:7a:ea
+ 4b:0e:ee:1d:dc:e0:27:08:83:16:aa:de:37:59:39:c0
+ 21:26:b5:34:49:f2:1f:7b:0c:d4:3c:0f:e5:06:ac:23
+ 7b:85:b1:39:35:44:ec:70:48:c5:10:86:02:ea:36:4a
+ f1:20:a2:b2:c9:8d:d3:f6:5a:86:72:4b:8b:28:07:04
+ 39:8d:01:fa:75:3a:35:40:c2:21:c3:ac:50:da:2f:3e
+ 30:ee:ab:f7:7d:81:a3:77:5e:b7:03:be:52:fb:a4:70
+ 92:5d:fd:09:ae:52:33:b8:7b:9c:e2:2a:77:f7:23:4d
+ c5:4b:82:f1:fb:0a:09:62:e6:5f:32:1e:7b:c7:c6:66
+ ab:
+
+coefficient:
+ 00:c3:2d:d8:18:32:30:a1:fa:2c:23:d0:ea:b4:60:0f
+ 29:67:50:4a:5a:61:aa:6d:15:0e:4b:66:43:35:ee:39
+ 4c:e7:8d:31:73:b0:bb:04:4d:e5:bc:28:ea:dc:77:81
+ 35:bb:f7:80:13:96:04:4c:45:9c:43:6f:64:e0:a3:51
+ 4b:7e:6c:b6:7d:c2:a6:e0:94:e6:6c:34:4e:62:71:ea
+ c0:c0:ab:30:30:c1:3a:39:0e:cd:f0:cc:0e:31:b5:fc
+ 61:64:1e:29:1c:cd:fc:69:c0:02:7c:2a:fe:86:d5:e2
+ 7b:8d:fe:ae:3d:3a:6c:1b:b3:b4:0d:b1:1b:d1:4d:37
+ 36:ea:d7:15:f3:6e:02:b1:86:98:51:02:fc:62:df:30
+ f2:de:9f:03:6d:27:45:d7:c7:a8:04:ba:76:18:01:09
+ 34:d2:57:f9:10:50:ea:ae:0e:ae:c6:a4:cd:f9:fd:b1
+ 25:b2:45:20:bc:50:2d:9b:80:c1:39:08:97:d2:75:9b
+ f7:
+
+exp1:
+ 00:8a:b8:6a:8b:cf:8c:54:08:c8:d9:74:63:82:67:25
+ fb:0e:08:b1:b0:f3:14:7f:ab:3f:a4:63:65:e9:55:05
+ 5e:36:a7:0a:23:41:ea:f2:a0:c1:16:63:9b:48:22:41
+ f2:7a:21:93:81:8a:ea:20:f2:bc:fe:59:39:d8:fb:45
+ b5:0a:7b:ac:ca:2e:79:5d:cf:6d:b1:03:d7:a1:17:2e
+ e3:3e:00:46:e4:15:c9:b1:cc:c8:00:71:ba:84:6a:82
+ 2c:c6:a5:4f:91:74:c4:af:a9:47:07:95:41:ca:f0:67
+ 2a:b1:83:51:9a:fd:53:7a:24:94:a2:b6:77:a9:ef:06
+ d4:0b:dc:4f:e6:18:39:6f:50:27:1d:bc:65:70:32:df
+ 2f:15:e9:4a:7f:1d:42:e9:8d:e6:4b:a6:63:83:cd:25
+ d6:a9:76:f9:81:2a:c0:b7:a1:2e:17:d7:59:b0:d2:89
+ 1b:aa:cb:bf:b2:d2:38:5d:a8:fa:06:ac:9a:ee:4a:7d
+ 61:
+
+exp2:
+ 00:92:66:af:db:d8:ac:33:36:66:1a:bc:6a:78:22:7c
+ 1c:5c:d1:2b:18:dd:25:fa:95:79:9f:33:38:15:c0:41
+ a8:28:38:b1:57:21:44:d5:bf:a5:36:3a:07:f2:24:36
+ be:91:a4:4f:de:f7:16:df:df:76:e5:87:b1:69:79:b0
+ b9:5e:2c:4f:3f:6e:18:74:04:f3:a3:50:93:9f:a3:f4
+ f0:e7:1b:4e:43:ae:04:25:d6:bd:9d:6d:78:29:d3:1d
+ 3e:76:0c:80:d4:e4:81:2f:92:a8:5b:09:ac:dd:59:c0
+ f3:4a:35:ad:1d:09:15:9d:53:05:8f:9a:a9:b6:44:dd
+ c7:0c:2d:cf:38:42:b2:7c:24:cf:cd:44:80:fa:f3:aa
+ 31:ee:08:9e:ae:54:e6:f4:2f:8d:3b:74:dc:89:5b:2d
+ 04:c1:c1:3f:f7:69:cf:0a:09:23:26:69:82:8c:4e:5d
+ dc:7f:2b:e6:82:18:b5:1e:c6:1a:e9:0f:51:df:8f:7f
+ 19:
+
+
+Public Key PIN:
+ pin-sha256:pFSHHHovr50DJ04K3wEJcyxth+nszZdClOet/CRN9cU=
+Public Key ID:
+ sha256:a454871c7a2faf9d03274e0adf0109732c6d87e9eccd974294e7adfc244df5c5
+ sha1:5137ef343399ccf38d6566803ddce123da640553
+
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/daemon/lua/trust_anchors.test/x509/server.pem b/daemon/lua/trust_anchors.test/x509/server.pem
new file mode 100644
index 0000000..b42f07e
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/server.pem
@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/daemon/lua/trust_anchors.test/x509/server.tmpl b/daemon/lua/trust_anchors.test/x509/server.tmpl
new file mode 100644
index 0000000..8021616
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/server.tmpl
@@ -0,0 +1,7 @@
+organization = Fake DNS root org test server
+cn = localhost
+tls_www_server
+encryption_key
+signing_key
+dns_name = localhost
+expiration_days = -1
diff --git a/daemon/lua/trust_anchors.test/x509/wrongca-key.pem b/daemon/lua/trust_anchors.test/x509/wrongca-key.pem
new file mode 100644
index 0000000..1ddc1ad
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/wrongca-key.pem
@@ -0,0 +1,182 @@
+Public Key Info:
+ Public Key Algorithm: RSA
+ Key Security Level: High (3072 bits)
+
+modulus:
+ 00:bb:d7:47:1f:55:ed:c0:08:af:1d:32:d2:69:ef:77
+ d2:f3:f6:86:7e:f3:97:e2:35:72:d4:0a:87:1e:75:76
+ bf:59:29:be:cd:e6:ad:6d:7d:62:47:19:fb:ed:24:94
+ 7f:2b:d6:0c:68:cf:cd:ee:f3:5e:b2:db:11:44:4b:7f
+ 30:ce:d2:a7:75:a7:37:83:c0:41:d6:a1:87:22:48:fa
+ ef:d1:15:ed:c9:d2:73:ab:e1:7c:94:4d:b2:96:80:cf
+ 5a:5c:7e:96:f6:02:fa:a4:8b:b1:05:b0:27:f5:d7:38
+ bd:20:37:ed:12:c0:22:07:a9:a6:5e:47:bd:1d:33:27
+ a2:cd:4c:0c:70:ba:6e:d9:13:6f:7b:a1:72:e8:f4:be
+ e3:86:1b:a2:b3:a1:07:cf:93:e8:3a:26:51:3e:af:bc
+ da:80:b1:92:56:8b:21:e7:1d:d9:f9:0c:a9:68:b7:04
+ d8:6d:1f:6f:98:90:fb:fb:35:18:71:3c:50:73:b1:45
+ b1:e7:ee:7b:84:5d:57:95:33:37:b0:0f:eb:85:8f:8d
+ b0:7f:10:17:80:03:99:1b:62:0c:1d:72:6f:e5:77:38
+ c8:75:96:61:36:4b:28:ae:17:a4:f9:81:90:4d:4b:85
+ 61:39:be:6c:ca:c0:a9:cd:4e:45:27:47:84:82:3d:7f
+ c6:a7:00:d7:90:64:7c:a5:e9:f8:f6:92:d2:72:54:a7
+ 95:5f:fc:93:1d:c9:1a:78:6e:3a:1a:1f:8f:a2:41:d2
+ 04:5c:19:32:54:16:f2:97:6f:7c:f9:24:d7:a6:e2:07
+ cf:9f:9e:64:27:81:5f:5a:77:65:4f:7b:b2:81:78:3f
+ a3:22:17:d3:ba:06:71:d5:09:6a:c2:85:ba:35:f7:71
+ 01:b4:63:c7:70:62:98:58:80:a2:40:27:c0:e2:d5:fd
+ 60:e0:5a:7a:9c:bf:7b:e6:34:78:f1:16:e8:28:d9:92
+ dc:e6:2e:b6:d7:1a:83:4b:86:92:d6:81:ce:8e:50:0a
+ d5:
+
+public exponent:
+ 01:00:01:
+
+private exponent:
+ 7a:27:5e:66:1f:60:54:60:91:58:80:a3:5b:26:d2:9a
+ 89:f2:88:b6:68:3d:1e:6b:39:b8:70:fc:3b:af:91:c0
+ 90:00:58:c7:d7:ba:72:98:76:5f:dc:a2:fb:2d:ad:b0
+ 21:d6:ba:0d:33:0e:2d:d5:70:81:09:7b:6a:19:5a:a6
+ 67:e9:8f:e3:30:12:27:08:d1:07:fd:d5:3e:53:8d:74
+ 85:59:28:60:f6:0e:28:f9:a3:25:62:7d:bf:e8:16:70
+ 21:f4:64:c1:a9:60:4b:bf:58:28:65:cd:26:cf:86:63
+ 5f:5f:5f:39:b1:5e:af:f3:00:71:11:60:07:6c:2b:db
+ 70:7c:83:1e:8f:ee:e4:16:02:8a:b8:8c:5c:b8:44:a6
+ fb:a0:5f:27:47:92:27:c8:7c:dd:cb:eb:4b:c3:c7:21
+ a5:4d:54:e8:18:e4:bc:42:aa:6c:8e:72:60:d9:9c:3a
+ 0e:84:c1:f2:ca:5e:43:97:dc:c4:4e:bf:d6:ec:b2:70
+ 08:41:13:01:48:bc:36:a2:eb:5e:67:b6:6a:a4:b6:4a
+ 24:fa:fd:6d:ef:5b:77:bc:0c:7d:95:9a:84:ec:3f:97
+ aa:7c:07:76:80:f5:3a:49:f4:99:ee:cf:17:12:83:e8
+ db:ef:22:60:67:62:f8:3e:f9:bc:18:2b:84:fc:a9:82
+ 95:8d:91:27:8e:ba:87:15:65:1e:9f:b3:95:5f:dc:40
+ 2f:15:eb:7e:0a:d7:69:80:7b:8a:e2:29:89:3a:2e:eb
+ a9:05:c1:1e:5d:23:0d:a0:d7:c4:95:4d:09:85:8c:af
+ 90:23:36:04:66:a9:16:d7:d4:e2:aa:5a:6d:44:5a:6c
+ c8:e8:a0:08:fa:de:19:20:5f:e3:06:17:e5:65:c6:55
+ ef:0f:0d:ff:3e:1c:c5:98:ee:34:d3:07:81:11:fe:e9
+ 15:87:e6:9a:76:44:bd:cb:a0:38:63:9a:af:d1:7c:a7
+ db:26:e2:cd:4a:a2:8a:7f:b8:dc:7a:55:00:4c:20:c1
+
+
+prime1:
+ 00:c9:f5:14:59:49:3b:95:1f:15:b0:0c:83:cb:f4:6a
+ 48:60:2a:af:8b:d5:83:16:aa:71:5a:af:11:63:c6:c1
+ 0a:91:af:5b:bd:6e:9c:cb:d7:eb:bf:c7:31:9f:22:46
+ 01:cf:3b:3c:cb:ba:7d:ad:e5:bb:d8:7c:d2:5d:52:20
+ 14:ea:70:08:9e:29:98:31:20:78:9e:b6:3e:90:e8:ef
+ c8:2f:45:d4:35:04:71:a1:84:18:50:a9:a5:12:b7:14
+ 4e:42:3e:93:50:9d:2f:c1:bd:45:f3:4e:86:61:0b:bc
+ 3b:ed:78:c7:2b:ba:4b:a0:ef:e6:0e:a9:9a:f4:aa:73
+ 23:b8:51:c7:d3:dd:fd:a7:1c:c1:69:32:ea:26:32:6d
+ 40:b0:0a:cd:0d:fa:b4:f4:56:ed:e8:d4:96:08:80:fd
+ 43:44:8c:fb:bb:af:81:d7:bb:71:c6:7c:3a:d2:a7:83
+ e6:28:2d:2f:00:05:82:d7:cc:59:db:d9:e5:4f:a4:67
+ 05:
+
+prime2:
+ 00:ee:1b:2a:48:37:fa:7c:94:35:36:ac:83:5f:2c:98
+ e3:07:43:d1:2c:80:0e:a2:b8:7a:eb:e2:70:f6:49:77
+ b3:42:05:fe:06:cf:3f:ca:0f:0d:44:1c:74:0a:77:f7
+ 31:9f:30:fb:d9:44:71:11:e6:4a:ff:ef:ae:77:98:3e
+ 73:a0:77:21:a6:e0:66:9a:cf:5f:eb:3b:39:62:0b:ba
+ 1b:9b:1a:a5:58:4c:7e:17:fc:64:61:93:89:f0:c0:0f
+ ce:55:18:7e:d4:33:87:32:0e:53:51:5f:03:b4:05:4a
+ 5c:e7:5b:10:e5:b7:88:e5:04:b2:53:45:98:2f:9d:fb
+ 32:f5:2f:d9:59:54:ce:91:83:4c:37:ee:ab:5a:05:40
+ 85:05:03:ae:b4:3d:96:c2:67:6b:28:25:91:87:ed:d1
+ 3a:0f:4b:38:a5:81:b3:5b:6f:3e:33:27:1e:9a:4a:e6
+ 3c:7c:be:9f:45:72:5b:eb:e3:dd:6c:73:ae:0d:07:bd
+ 91:
+
+coefficient:
+ 45:53:87:ab:71:9c:14:af:6c:00:44:bb:de:d5:72:ed
+ e9:21:f2:19:e5:4d:30:92:8e:9b:b7:f6:db:9e:ea:71
+ b3:c2:89:01:4a:49:1f:2e:f8:34:57:e0:36:9a:20:84
+ a8:b0:8a:0b:2a:d6:da:36:22:c2:ac:a2:85:99:f7:5d
+ 3f:2e:71:ab:e5:f7:bd:b2:8c:6f:44:33:aa:2d:cf:38
+ 8c:d6:77:c7:d5:68:88:f1:f9:80:c2:e2:b8:58:26:bd
+ de:d6:8d:d5:c9:43:dc:e2:af:2e:d3:c5:19:4e:d5:14
+ 33:bc:15:58:6f:05:eb:8d:0d:fa:40:a3:b7:77:24:4b
+ 30:a7:c2:8b:89:08:24:4d:fb:2e:3c:ad:ff:e3:d7:8b
+ 9c:f2:07:0d:79:3c:5e:f5:83:94:32:e2:16:dc:a9:22
+ b4:f4:09:6a:f6:af:7d:9c:41:dc:be:23:7e:c4:6d:d6
+ f9:e6:8e:3c:2d:00:fa:ac:d2:c8:6e:c5:6d:52:74:cd
+
+
+exp1:
+ 4d:20:f9:2d:84:47:6a:13:1e:10:47:27:4a:8c:44:ce
+ f1:53:3c:09:d6:78:22:fe:e3:1d:b4:00:9b:2f:7b:e8
+ 12:6d:7b:46:e4:68:a3:7d:09:ff:0b:0f:0b:6c:66:7a
+ 28:6f:c2:2f:38:40:e9:59:f4:9c:a0:47:22:f6:cb:63
+ d1:89:09:f1:85:87:27:33:f4:7d:00:b2:f2:5a:d3:c0
+ 8b:35:4a:ef:18:8c:61:17:f6:c5:4f:94:c8:89:fd:0a
+ 4a:48:65:b0:82:e7:8b:41:42:e6:c2:15:96:18:8a:42
+ 04:d6:7c:92:59:aa:aa:83:14:44:83:47:b7:ab:25:1f
+ fe:33:d5:72:37:b4:b8:ce:c5:9a:ec:a3:fa:04:86:2f
+ 0f:4c:80:b5:97:0a:e6:ca:10:40:3c:78:34:35:37:04
+ 2a:b9:01:26:d3:c7:6d:e1:9b:79:27:56:bb:be:d8:23
+ dd:32:2c:62:00:b8:d0:bb:ad:91:c6:2c:ca:76:ca:15
+
+
+exp2:
+ 30:d8:19:c0:5e:db:5f:9a:f7:9f:93:9c:0f:76:12:96
+ df:f2:a5:82:3f:72:c1:26:9e:f0:ac:af:07:96:e2:9b
+ 3f:3c:03:74:5a:27:77:c7:c6:ac:e6:39:57:bc:6c:55
+ 1d:96:ea:d3:13:1b:2e:d4:d3:25:d5:81:30:bf:66:70
+ 49:c6:a6:7c:99:23:f3:35:ff:33:3e:1e:f3:61:fc:77
+ 95:45:ce:0d:63:03:aa:df:f7:a7:9c:a0:7b:66:aa:d7
+ 64:d5:75:8f:0a:52:fd:8d:ba:c1:c2:7f:fb:f9:e9:db
+ 4d:0a:7d:58:e2:61:8e:b9:7b:eb:61:27:6a:fd:39:7e
+ a6:95:7e:3c:b9:0c:f7:04:bc:29:ed:27:f1:7b:8a:54
+ bf:46:96:1c:1b:56:45:e2:f9:34:6f:20:7f:85:e5:99
+ c7:71:62:d9:70:d5:de:37:df:c6:96:8b:cc:92:f8:d0
+ 07:b7:02:ed:38:1c:6b:33:7f:44:b4:26:4c:3d:fe:41
+
+
+
+Public Key PIN:
+ pin-sha256:UOonm3sEw21t/nC/tr24q9sX/HPV9mo0/M3Ya8rAwLs=
+Public Key ID:
+ sha256:50ea279b7b04c36d6dfe70bfb6bdb8abdb17fc73d5f66a34fccdd86bcac0c0bb
+ sha1:b963cfb8eb202ccad2bb988dfa9e00cc52c1a4ba
+
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/daemon/lua/trust_anchors.test/x509/wrongca.pem b/daemon/lua/trust_anchors.test/x509/wrongca.pem
new file mode 100644
index 0000000..fc3e43f
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/wrongca.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/daemon/lua/trust_anchors.test/x509/wrongca.tmpl b/daemon/lua/trust_anchors.test/x509/wrongca.tmpl
new file mode 100644
index 0000000..0e8491b
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/x509/wrongca.tmpl
@@ -0,0 +1,4 @@
+cn = Another unrelated CA
+ca
+cert_signing_key
+expiration_days = -1
diff --git a/daemon/lua/zonefile.lua b/daemon/lua/zonefile.lua
new file mode 100644
index 0000000..8ea3a08
--- /dev/null
+++ b/daemon/lua/zonefile.lua
@@ -0,0 +1,93 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+-- LuaJIT ffi bindings for zscanner, a DNS zone parser.
+-- Author: Marek Vavrusa <marek.vavrusa@nic.cz>
+
+local ffi = require('ffi')
+local libzscanner = ffi.load(libzscanner_SONAME)
+
+-- Wrap scanner context
+local zs_scanner_t = ffi.typeof('zs_scanner_t')
+ffi.metatype( zs_scanner_t, {
+ __gc = function(zs) return libzscanner.zs_deinit(zs) end,
+ __new = function(ct, origin, class, ttl)
+ if not class then class = 1 end
+ if not ttl then ttl = 3600 end
+ local parser = ffi.new(ct)
+ libzscanner.zs_init(parser, origin, class, ttl)
+ return parser
+ end,
+ __index = {
+ open = function (zs, file)
+ assert(ffi.istype(zs, zs_scanner_t))
+ local ret = libzscanner.zs_set_input_file(zs, file)
+ if ret ~= 0 then return false, zs:strerr() end
+ return true
+ end,
+ parse = function(zs, input)
+ assert(ffi.istype(zs, zs_scanner_t))
+ if input ~= nil then libzscanner.zs_set_input_string(zs, input, #input) end
+ local ret = libzscanner.zs_parse_record(zs)
+ -- Return current state only when parsed correctly, otherwise return error
+ if ret == 0 and zs.state ~= "ZS_STATE_ERROR" then
+ return zs.state == "ZS_STATE_DATA"
+ else
+ return false, zs:strerr()
+ end
+ end,
+ current_rr = function(zs)
+ assert(ffi.istype(zs, zs_scanner_t))
+ return {
+ owner = ffi.string(zs.r_owner, zs.r_owner_length),
+ ttl = tonumber(zs.r_ttl),
+ class = tonumber(zs.r_class),
+ type = tonumber(zs.r_type),
+ rdata = ffi.string(zs.r_data, zs.r_data_length),
+ comment = zs:current_comment(),
+ }
+ end,
+ strerr = function(zs)
+ assert(ffi.istype(zs, zs_scanner_t))
+ return ffi.string(libzscanner.zs_strerror(zs.error.code))
+ end,
+ current_comment = function(zs)
+ if zs.buffer_length > 0 then
+ return ffi.string(zs.buffer, zs.buffer_length - 1)
+ else
+ return nil
+ end
+ end
+ },
+})
+
+-- Module API
+local rrparser = {
+ new = zs_scanner_t,
+
+ -- Parse a file into a list of RRs
+ file = function (path)
+ local zs = zs_scanner_t()
+ local ok, err = zs:open(path)
+ if not ok then
+ return ok, err
+ end
+ local results = {}
+ while zs:parse() do
+ table.insert(results, zs:current_rr())
+ end
+ return results
+ end,
+
+ -- Parse a string into a list of RRs.
+ string = function (input)
+ local zs = zs_scanner_t()
+ local results = {}
+ local ok = zs:parse(input)
+ while ok do
+ table.insert(results, zs:current_rr())
+ ok = zs:parse()
+ end
+ return results
+ end,
+}
+return rrparser
diff --git a/daemon/main.c b/daemon/main.c
new file mode 100644
index 0000000..8bbd560
--- /dev/null
+++ b/daemon/main.c
@@ -0,0 +1,592 @@
+/* Copyright (C) 2014-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "kresconfig.h"
+
+#include "contrib/ccan/asprintf/asprintf.h"
+#include "contrib/cleanup.h"
+#include "contrib/ucw/mempool.h"
+#include "daemon/engine.h"
+#include "daemon/io.h"
+#include "daemon/network.h"
+#include "daemon/tls.h"
+#include "daemon/udp_queue.h"
+#include "daemon/worker.h"
+#include "lib/defines.h"
+#include "lib/dnssec.h"
+#include "lib/dnssec/ta.h"
+#include "lib/resolve.h"
+
+#include <arpa/inet.h>
+#include <assert.h>
+#include <getopt.h>
+#include <libgen.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <unistd.h>
+
+#if ENABLE_CAP_NG
+#include <cap-ng.h>
+#endif
+
+#include <lua.h>
+#include <uv.h>
+#if ENABLE_LIBSYSTEMD
+#include <systemd/sd-daemon.h>
+#endif
+#include <libknot/error.h>
+
+
+struct args the_args_value; /** Static allocation for the_args singleton. */
+
+static void signal_handler(uv_signal_t *handle, int signum)
+{
+ uv_stop(uv_default_loop());
+ uv_signal_stop(handle);
+}
+
+/** SIGBUS -> attempt to remove the overflowing cache file and abort. */
+static void sigbus_handler(int sig, siginfo_t *siginfo, void *ptr)
+{
+ /* We can't safely assume that printf-like functions work, but write() is OK.
+ * See POSIX for the safe functions, e.g. 2017 version just above this link:
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04_04
+ */
+ #define WRITE_ERR(err_charray) \
+ (void)write(STDERR_FILENO, err_charray, sizeof(err_charray))
+ /* Unfortunately, void-cast on the write isn't enough to avoid the warning. */
+ #pragma GCC diagnostic push
+ #pragma GCC diagnostic ignored "-Wunused-result"
+ const char msg_typical[] =
+ "\nSIGBUS received; this is most likely due to filling up the filesystem where cache resides.\n",
+ msg_unknown[] = "\nSIGBUS received, cause unknown.\n",
+ msg_deleted[] = "Cache file deleted.\n",
+ msg_del_fail[] = "Cache file deletion failed.\n",
+ msg_final[] = "kresd can not recover reliably by itself, exiting.\n";
+ if (siginfo->si_code != BUS_ADRERR) {
+ WRITE_ERR(msg_unknown);
+ goto end;
+ }
+ WRITE_ERR(msg_typical);
+ if (!kr_cache_emergency_file_to_remove) goto end;
+ if (unlink(kr_cache_emergency_file_to_remove)) {
+ WRITE_ERR(msg_del_fail);
+ } else {
+ WRITE_ERR(msg_deleted);
+ }
+end:
+ WRITE_ERR(msg_final);
+ _exit(128 - sig); /*< regular return from OS-raised SIGBUS can't work anyway */
+ #undef WRITE_ERR
+ #pragma GCC diagnostic pop
+}
+
+
+/*
+ * Server operation.
+ */
+
+static int fork_workers(int forks)
+{
+ /* Fork subprocesses if requested */
+ while (--forks > 0) {
+ int pid = fork();
+ if (pid < 0) {
+ perror("[system] fork");
+ return kr_error(errno);
+ }
+
+ /* Forked process */
+ if (pid == 0) {
+ return forks;
+ }
+ }
+ return 0;
+}
+
+static void help(int argc, char *argv[])
+{
+ printf("Usage: %s [parameters] [rundir]\n", argv[0]);
+ printf("\nParameters:\n"
+ " -a, --addr=[addr] Server address (default: localhost@53).\n"
+ " -t, --tls=[addr] Server address for TLS (default: off).\n"
+ " -S, --fd=[fd:kind] Listen on given fd (handed out by supervisor, :kind is optional).\n"
+ " -c, --config=[path] Config file path (relative to [rundir]) (default: config).\n"
+ " -n, --noninteractive Don't start the read-eval-print loop for stdin+stdout.\n"
+ " -q, --quiet No command prompt in interactive mode.\n"
+ " -v, --verbose Run in verbose mode."
+#ifdef NOVERBOSELOG
+ " (Recompile without -DNOVERBOSELOG to activate.)"
+#endif
+ "\n"
+ " -V, --version Print version of the server.\n"
+ " -h, --help Print help and usage.\n"
+ "Options:\n"
+ " [rundir] Path to the working directory (default: .)\n");
+}
+
+/** \return exit code for main() */
+static int run_worker(uv_loop_t *loop, struct engine *engine, bool leader, struct args *args)
+{
+ /* Only some kinds of stdin work with uv_pipe_t.
+ * Otherwise we would abort() from libuv e.g. with </dev/null */
+ if (args->interactive) switch (uv_guess_handle(0)) {
+ case UV_TTY: /* standard terminal */
+ /* TODO: it has worked OK so far, but we'd better use uv_tty_*
+ * for this case instead of uv_pipe_*. */
+ case UV_NAMED_PIPE: /* echo 'quit()' | kresd ... */
+ break;
+ default:
+ kr_log_error(
+ "[system] error: standard input is not a terminal or pipe; "
+ "use '-n' if you want non-interactive mode. "
+ "Commands can be simply added to your configuration file or sent over the control socket.\n"
+ );
+ return EXIT_FAILURE;
+ }
+
+ /* Control sockets or TTY */
+ uv_pipe_t *pipe = malloc(sizeof(*pipe));
+ uv_pipe_init(loop, pipe, 0);
+ if (args->interactive) {
+ if (!args->quiet)
+ printf("[system] interactive mode\n> ");
+ pipe->data = io_tty_alloc_data();
+ uv_pipe_open(pipe, 0);
+ uv_read_start((uv_stream_t*)pipe, io_tty_alloc, io_tty_process_input);
+ } else if (args->control_fd != -1 && uv_pipe_open(pipe, args->control_fd) == 0) {
+ uv_listen((uv_stream_t *)pipe, 16, io_tty_accept);
+ }
+
+ /* Notify supervisor. */
+#if ENABLE_LIBSYSTEMD
+ sd_notify(0, "READY=1");
+#endif
+ /* Run event loop */
+ uv_run(loop, UV_RUN_DEFAULT);
+ /* Free pipe's data. Seems OK even on the stopped loop.
+ * In interactive case it may have been done in callbacks already (single leak). */
+ if (!args->interactive) {
+ uv_close((uv_handle_t *)pipe, NULL);
+ free(pipe);
+ }
+ return EXIT_SUCCESS;
+}
+
+static void args_init(struct args *args)
+{
+ memset(args, 0, sizeof(struct args));
+ /* Zeroed arrays are OK. */
+ args->forks = 1;
+ args->control_fd = -1;
+ args->interactive = true;
+ args->quiet = false;
+}
+
+/* Free pointed-to resources. */
+static void args_deinit(struct args *args)
+{
+ array_clear(args->addrs);
+ array_clear(args->addrs_tls);
+ for (int i = 0; i < args->fds.len; ++i)
+ free_const(args->fds.at[i].flags.kind);
+ array_clear(args->fds);
+ array_clear(args->config);
+}
+
+static long strtol_10(const char *s)
+{
+ if (!s) abort();
+ /* ^^ This shouldn't ever happen. When getopt_long() returns an option
+ * character that has a mandatory parameter, optarg can't be NULL. */
+ return strtol(s, NULL, 10);
+}
+
+/** Process arguments into struct args.
+ * @return >=0 if main() should be exited immediately.
+ */
+static int parse_args(int argc, char **argv, struct args *args)
+{
+ /* Long options. */
+ int c = 0, li = 0;
+ struct option opts[] = {
+ {"addr", required_argument, 0, 'a'},
+ {"tls", required_argument, 0, 't'},
+ {"config", required_argument, 0, 'c'},
+ {"forks", required_argument, 0, 'f'},
+ {"noninteractive", no_argument, 0, 'n'},
+ {"verbose", no_argument, 0, 'v'},
+ {"quiet", no_argument, 0, 'q'},
+ {"version", no_argument, 0, 'V'},
+ {"help", no_argument, 0, 'h'},
+ {"fd", required_argument, 0, 'S'},
+ {0, 0, 0, 0}
+ };
+ while ((c = getopt_long(argc, argv, "a:t:c:f:nvqVhS:", opts, &li)) != -1) {
+ switch (c)
+ {
+ case 'a':
+ array_push(args->addrs, optarg);
+ break;
+ case 't':
+ array_push(args->addrs_tls, optarg);
+ break;
+ case 'c':
+ assert(optarg != NULL);
+ array_push(args->config, optarg);
+ break;
+ case 'f':
+ args->forks = strtol_10(optarg);
+ if (args->forks == 1) {
+ kr_log_deprecate("use --noninteractive instead of --forks=1\n");
+ } else {
+ kr_log_deprecate("support for running multiple --forks will be removed\n");
+ }
+ if (args->forks <= 0) {
+ kr_log_error("[system] error '-f' requires a positive"
+ " number, not '%s'\n", optarg);
+ return EXIT_FAILURE;
+ }
+ /* fall through */
+ case 'n':
+ args->interactive = false;
+ break;
+ case 'v':
+ kr_verbose_set(true);
+#ifdef NOVERBOSELOG
+ kr_log_info("--verbose flag has no effect due to compilation with -DNOVERBOSELOG.\n");
+#endif
+ break;
+ case 'q':
+ args->quiet = true;
+ break;
+ case 'V':
+ kr_log_info("%s, version %s\n", "Knot Resolver", PACKAGE_VERSION);
+ return EXIT_SUCCESS;
+ case 'h':
+ case '?':
+ help(argc, argv);
+ return EXIT_SUCCESS;
+ default:
+ help(argc, argv);
+ return EXIT_FAILURE;
+ case 'S':
+ (void)0;
+ flagged_fd_t ffd = { 0 };
+ char *endptr;
+ ffd.fd = strtol(optarg, &endptr, 10);
+ if (endptr != optarg && endptr[0] == '\0') {
+ /* Plain DNS */
+ ffd.flags.tls = false;
+ } else if (endptr[0] == ':' && strcasecmp(endptr + 1, "tls") == 0) {
+ /* DoT */
+ ffd.flags.tls = true;
+ /* We know what .sock_type should be but it wouldn't help. */
+ } else if (endptr[0] == ':' && endptr[1] != '\0') {
+ /* Some other kind; no checks here. */
+ ffd.flags.kind = strdup(endptr + 1);
+ } else {
+ kr_log_error("[system] incorrect value passed to '-S/--fd': %s\n",
+ optarg);
+ return EXIT_FAILURE;
+ }
+ array_push(args->fds, ffd);
+ break;
+ }
+ }
+ if (optind < argc) {
+ args->rundir = argv[optind];
+ }
+ return -1;
+}
+
+/** Just convert addresses to file-descriptors; clear *addrs on success.
+ * @note AF_UNIX is supported (starting with '/').
+ * @return zero or exit code for main()
+ */
+static int bind_sockets(addr_array_t *addrs, bool tls, flagged_fd_array_t *fds)
+{
+ bool has_error = false;
+ for (size_t i = 0; i < addrs->len; ++i) {
+ /* Get port and separate address string. */
+ uint16_t port = tls ? KR_DNS_TLS_PORT : KR_DNS_PORT;
+ char addr_buf[INET6_ADDRSTRLEN + 1];
+ int ret;
+ const char *addr_str;
+ const int family = kr_straddr_family(addrs->at[i]);
+ if (family == AF_UNIX) {
+ ret = 0;
+ addr_str = addrs->at[i];
+ } else { /* internet socket (or garbage) */
+ ret = kr_straddr_split(addrs->at[i], addr_buf, &port);
+ addr_str = addr_buf;
+ }
+ /* Get sockaddr. */
+ struct sockaddr *sa = NULL;
+ if (ret == 0) {
+ sa = kr_straddr_socket(addr_str, port, NULL);
+ if (!sa) ret = kr_error(EINVAL); /* could be ENOMEM but unlikely */
+ }
+ flagged_fd_t ffd = { .flags = { .tls = tls } };
+ if (ret == 0 && !tls && family != AF_UNIX) {
+ /* AF_UNIX can do SOCK_DGRAM, but let's not support that *here*. */
+ ffd.fd = io_bind(sa, SOCK_DGRAM, NULL);
+ if (ffd.fd < 0)
+ ret = ffd.fd;
+ else if (array_push(*fds, ffd) < 0)
+ ret = kr_error(ENOMEM);
+ }
+ if (ret == 0) { /* common for TCP and TLS, including AF_UNIX cases */
+ ffd.fd = io_bind(sa, SOCK_STREAM, NULL);
+ if (ffd.fd < 0)
+ ret = ffd.fd;
+ else if (array_push(*fds, ffd) < 0)
+ ret = kr_error(ENOMEM);
+ }
+ free(sa);
+ if (ret != 0) {
+ kr_log_error("[system] bind to '%s'%s: %s\n",
+ addrs->at[i], tls ? " (TLS)" : "", kr_strerror(ret));
+ has_error = true;
+ }
+ }
+ array_clear(*addrs);
+ return has_error ? EXIT_FAILURE : kr_ok();
+}
+
+static int start_listening(struct network *net, flagged_fd_array_t *fds) {
+ int some_bad_ret = 0;
+ for (size_t i = 0; i < fds->len; ++i) {
+ flagged_fd_t *ffd = &fds->at[i];
+ int ret = network_listen_fd(net, ffd->fd, ffd->flags);
+ if (ret != 0) {
+ some_bad_ret = ret;
+ /* TODO: try logging address@port. It's not too important,
+ * because typical problems happen during binding already.
+ * (invalid address, permission denied) */
+ kr_log_error("[system] listen on fd=%d: %s\n",
+ ffd->fd, kr_strerror(ret));
+ /* Continue printing all of these before exiting. */
+ } else {
+ ffd->flags.kind = NULL; /* ownership transferred */
+ }
+ }
+ return some_bad_ret;
+}
+
+/* Drop POSIX 1003.1e capabilities. */
+static void drop_capabilities(void)
+{
+#if ENABLE_CAP_NG
+ /* Drop all capabilities when running under non-root user. */
+ if (geteuid() == 0) {
+ kr_log_verbose("[system] running as root, no capabilities dropped\n");
+ return;
+ }
+ if (capng_have_capability(CAPNG_EFFECTIVE, CAP_SETPCAP)) {
+ capng_clear(CAPNG_SELECT_BOTH);
+
+ /* Apply. */
+ if (capng_apply(CAPNG_SELECT_BOTH) < 0) {
+ kr_log_error("[system] failed to set process capabilities: %s\n",
+ strerror(errno));
+ } else {
+ kr_log_verbose("[system] all capabilities dropped\n");
+ }
+ } else {
+ /* If user() was called, the capabilities were already dropped along with SETPCAP. */
+ kr_log_verbose("[system] process not allowed to set capabilities, skipping\n");
+ }
+#endif /* ENABLE_CAP_NG */
+}
+
+int main(int argc, char **argv)
+{
+ if (setvbuf(stdout, NULL, _IONBF, 0) || setvbuf(stderr, NULL, _IONBF, 0)) {
+ kr_log_error("[system] failed to to set output buffering (ignored): %s\n",
+ strerror(errno));
+ fflush(stderr);
+ }
+ if (strcmp("linux", OPERATING_SYSTEM) != 0)
+ kr_log_info("[warn] Knot Resolver is tested on Linux, other platforms might exhibit bugs.\n"
+ "Please report issues to https://gitlab.nic.cz/knot/knot-resolver/issues/\n"
+ "Thank you for your time and interest!\n");
+
+ the_args = &the_args_value;
+ args_init(the_args);
+ int ret = parse_args(argc, argv, the_args);
+ if (ret >= 0) goto cleanup_args;
+
+ ret = bind_sockets(&the_args->addrs, false, &the_args->fds);
+ if (ret) goto cleanup_args;
+ ret = bind_sockets(&the_args->addrs_tls, true, &the_args->fds);
+ if (ret) goto cleanup_args;
+
+ /* Switch to rundir. */
+ if (the_args->rundir != NULL) {
+ /* FIXME: access isn't a good way if we start as root and drop privileges later */
+ if (access(the_args->rundir, W_OK) != 0
+ || chdir(the_args->rundir) != 0) {
+ kr_log_error("[system] rundir '%s': %s\n",
+ the_args->rundir, strerror(errno));
+ return EXIT_FAILURE;
+ }
+ }
+
+ /* Select which config files to load and verify they are read-able. */
+ bool load_defaults = true;
+ size_t i = 0;
+ while (i < the_args->config.len) {
+ const char *config = the_args->config.at[i];
+ if (strcmp(config, "-") == 0) {
+ load_defaults = false;
+ array_del(the_args->config, i);
+ continue; /* don't increment i */
+ } else if (access(config, R_OK) != 0) {
+ char cwd[PATH_MAX];
+ get_workdir(cwd, sizeof(cwd));
+ kr_log_error("[system] config '%s' (workdir '%s'): %s\n",
+ config, cwd, strerror(errno));
+ return EXIT_FAILURE;
+ }
+ i++;
+ }
+ if (the_args->config.len == 0 && access("config", R_OK) == 0)
+ array_push(the_args->config, "config");
+ if (load_defaults)
+ array_push(the_args->config, LIBDIR "/postconfig.lua");
+
+ /* File-descriptor count limit: soft->hard. */
+ struct rlimit rlim;
+ ret = getrlimit(RLIMIT_NOFILE, &rlim);
+ if (ret == 0 && rlim.rlim_cur != rlim.rlim_max) {
+ kr_log_verbose("[system] increasing file-descriptor limit: %ld -> %ld\n",
+ (long)rlim.rlim_cur, (long)rlim.rlim_max);
+ rlim.rlim_cur = rlim.rlim_max;
+ ret = setrlimit(RLIMIT_NOFILE, &rlim);
+ }
+ if (ret) {
+ kr_log_error("[system] failed to get or set file-descriptor limit: %s\n",
+ strerror(errno));
+ } else if (rlim.rlim_cur < 512*1024) {
+ kr_log_info("[system] warning: hard limit for number of file-descriptors is only %ld but recommended value is 524288\n",
+ (long)rlim.rlim_cur);
+ }
+
+ /* Fork subprocesses if requested */
+ int fork_id = fork_workers(the_args->forks);
+ if (fork_id < 0) {
+ return EXIT_FAILURE;
+ }
+
+ kr_crypto_init();
+
+ /* Create a server engine. */
+ knot_mm_t pool;
+ mm_ctx_mempool(&pool, MM_DEFAULT_BLKSIZE);
+ static struct engine engine;
+ ret = engine_init(&engine, &pool);
+ if (ret != 0) {
+ kr_log_error("[system] failed to initialize engine: %s\n", kr_strerror(ret));
+ return EXIT_FAILURE;
+ }
+ /* Initialize the worker */
+ ret = worker_init(&engine, the_args->forks);
+ if (ret != 0) {
+ kr_log_error("[system] failed to initialize worker: %s\n", kr_strerror(ret));
+ return EXIT_FAILURE;
+ }
+
+ uv_loop_t *loop = uv_default_loop();
+ /* Catch some signals. */
+ uv_signal_t sigint, sigterm;
+ if (true) ret = uv_signal_init(loop, &sigint);
+ if (!ret) ret = uv_signal_init(loop, &sigterm);
+ if (!ret) ret = uv_signal_start(&sigint, signal_handler, SIGINT);
+ if (!ret) ret = uv_signal_start(&sigterm, signal_handler, SIGTERM);
+ /* Block SIGPIPE; see https://github.com/libuv/libuv/issues/45 */
+ if (!ret && signal(SIGPIPE, SIG_IGN) == SIG_ERR) ret = errno;
+ if (!ret) {
+ /* Catching SIGBUS via uv_signal_* can't work; see:
+ * https://github.com/libuv/libuv/pull/1987 */
+ struct sigaction sa;
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_sigaction = sigbus_handler;
+ sa.sa_flags = SA_SIGINFO;
+ if (sigaction(SIGBUS, &sa, NULL)) {
+ ret = errno;
+ }
+ }
+ if (ret) {
+ kr_log_error("[system] failed to set up signal handlers: %s\n",
+ strerror(abs(errno)));
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+ /* Profiling: avoid SIGPROF waking up the event loop. Otherwise the profiles
+ * (of the usual type) may skew results, e.g. epoll_pwait() taking lots of time. */
+ ret = uv_loop_configure(loop, UV_LOOP_BLOCK_SIGNAL, SIGPROF);
+ if (ret) {
+ kr_log_info("[system] failed to block SIGPROF in event loop, ignoring: %s\n",
+ uv_strerror(ret));
+ }
+
+ /* Start listening, in the sense of network_listen_fd(). */
+ if (start_listening(&engine.net, &the_args->fds) != 0) {
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+
+ ret = udp_queue_init_global(loop);
+ if (ret) {
+ kr_log_error("[system] failed to initialize UDP queue: %s\n",
+ kr_strerror(ret));
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+
+ /* Start the scripting engine */
+ if (engine_load_sandbox(&engine) != 0) {
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+
+ for (i = 0; i < the_args->config.len; ++i) {
+ const char *config = the_args->config.at[i];
+ if (engine_loadconf(&engine, config) != 0) {
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+ lua_settop(engine.L, 0);
+ }
+
+ drop_capabilities();
+
+ if (engine_start(&engine) != 0) {
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+
+ if (network_engage_endpoints(&engine.net)) {
+ ret = EXIT_FAILURE;
+ goto cleanup;
+ }
+
+ /* Run the event loop */
+ ret = run_worker(loop, &engine, fork_id == 0, the_args);
+
+cleanup:/* Cleanup. */
+ engine_deinit(&engine);
+ worker_deinit();
+ if (loop != NULL) {
+ uv_loop_close(loop);
+ }
+ mp_delete(pool.ctx);
+cleanup_args:
+ args_deinit(the_args);
+ kr_crypto_cleanup();
+ return ret;
+}
diff --git a/daemon/meson.build b/daemon/meson.build
new file mode 100644
index 0000000..86d1100
--- /dev/null
+++ b/daemon/meson.build
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# daemon
+
+kresd_src = files([
+ 'bindings/cache.c',
+ 'bindings/event.c',
+ 'bindings/impl.c',
+ 'bindings/modules.c',
+ 'bindings/net.c',
+ 'bindings/worker.c',
+ 'engine.c',
+ 'ffimodule.c',
+ 'io.c',
+ 'main.c',
+ 'network.c',
+ 'session.c',
+ 'tls.c',
+ 'tls_ephemeral_credentials.c',
+ 'tls_session_ticket-srv.c',
+ 'udp_queue.c',
+ 'worker.c',
+ 'zimport.c',
+])
+if nghttp2.found()
+ kresd_src += files(['http.c'])
+endif
+
+c_src_lint += kresd_src
+
+config_tests += [
+ ['cache.clear', files('cache.test/clear.test.lua')],
+]
+
+integr_tests += [
+ ['cache_insert_ns', meson.current_source_dir() / 'cache.test' / 'insert_ns.test.integr']
+]
+
+kresd_deps = [
+ contrib_dep,
+ kresconfig_dep,
+ libkres_dep,
+ libknot,
+ libzscanner,
+ libdnssec,
+ libuv,
+ luajit,
+ gnutls,
+ libsystemd,
+ capng,
+ nghttp2,
+]
+
+
+subdir('lua')
+
+
+kresd = executable(
+ 'kresd',
+ kresd_src,
+ dependencies: kresd_deps,
+ export_dynamic: true,
+ install: true,
+ install_dir: get_option('sbindir'),
+)
diff --git a/daemon/network.c b/daemon/network.c
new file mode 100644
index 0000000..15b5e05
--- /dev/null
+++ b/daemon/network.c
@@ -0,0 +1,641 @@
+/* Copyright (C) 2015-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/network.h"
+
+#include "daemon/bindings/impl.h"
+#include "daemon/io.h"
+#include "daemon/tls.h"
+#include "daemon/worker.h"
+
+#include <assert.h>
+#include <libgen.h>
+#include <net/if.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+void network_init(struct network *net, uv_loop_t *loop, int tcp_backlog)
+{
+ if (net != NULL) {
+ net->loop = loop;
+ net->endpoints = map_make(NULL);
+ net->endpoint_kinds = trie_create(NULL);
+ net->tls_client_params = NULL;
+ net->tls_session_ticket_ctx = /* unsync. random, by default */
+ tls_session_ticket_ctx_create(loop, NULL, 0);
+ net->tcp.in_idle_timeout = 10000;
+ net->tcp.tls_handshake_timeout = TLS_MAX_HANDSHAKE_TIME;
+ net->tcp_backlog = tcp_backlog;
+ }
+}
+
+/** Notify the registered function about endpoint getting open.
+ * If log_port < 1, don't log it. */
+static int endpoint_open_lua_cb(struct network *net, struct endpoint *ep,
+ const char *log_addr)
+{
+ const bool ok = ep->flags.kind && !ep->handle && !ep->engaged && ep->fd != -1;
+ if (!ok) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+ /* First find callback in the endpoint registry. */
+ lua_State *L = the_worker->engine->L;
+ void **pp = trie_get_try(net->endpoint_kinds, ep->flags.kind,
+ strlen(ep->flags.kind));
+ if (!pp && net->missing_kind_is_error) {
+ kr_log_error("error: network socket kind '%s' not handled when opening '%s",
+ ep->flags.kind, log_addr);
+ if (ep->family != AF_UNIX)
+ kr_log_error("#%d", ep->port);
+ kr_log_error("'\n");
+ return kr_error(ENOENT);
+ }
+ if (!pp) return kr_ok();
+
+ /* Now execute the callback. */
+ const int fun_id = (char *)*pp - (char *)NULL;
+ lua_rawgeti(L, LUA_REGISTRYINDEX, fun_id);
+ lua_pushboolean(L, true /* open */);
+ lua_pushpointer(L, ep);
+ if (ep->family == AF_UNIX) {
+ lua_pushstring(L, log_addr);
+ } else {
+ lua_pushfstring(L, "%s#%d", log_addr, ep->port);
+ }
+ if (lua_pcall(L, 3, 0, 0)) {
+ kr_log_error("error opening %s: %s\n", log_addr, lua_tostring(L, -1));
+ return kr_error(ENOSYS); /* TODO: better value? */
+ }
+ ep->engaged = true;
+ return kr_ok();
+}
+
+static int engage_endpoint_array(const char *key, void *endpoints, void *net)
+{
+ endpoint_array_t *eps = (endpoint_array_t *)endpoints;
+ for (int i = 0; i < eps->len; ++i) {
+ struct endpoint *ep = &eps->at[i];
+ const bool match = !ep->engaged && ep->flags.kind;
+ if (!match) continue;
+ int ret = endpoint_open_lua_cb(net, ep, key);
+ if (ret) return ret;
+ }
+ return 0;
+}
+int network_engage_endpoints(struct network *net)
+{
+ if (net->missing_kind_is_error)
+ return kr_ok(); /* maybe weird, but let's make it idempotent */
+ net->missing_kind_is_error = true;
+ int ret = map_walk(&net->endpoints, engage_endpoint_array, net);
+ if (ret) {
+ net->missing_kind_is_error = false; /* avoid the same errors when closing */
+ return ret;
+ }
+ return kr_ok();
+}
+
+
+/** Notify the registered function about endpoint about to be closed. */
+static void endpoint_close_lua_cb(struct network *net, struct endpoint *ep)
+{
+ lua_State *L = the_worker->engine->L;
+ void **pp = trie_get_try(net->endpoint_kinds, ep->flags.kind,
+ strlen(ep->flags.kind));
+ if (!pp && net->missing_kind_is_error) {
+ kr_log_error("internal error: missing kind '%s' in endpoint registry\n",
+ ep->flags.kind);
+ return;
+ }
+ if (!pp) return;
+
+ const int fun_id = (char *)*pp - (char *)NULL;
+ lua_rawgeti(L, LUA_REGISTRYINDEX, fun_id);
+ lua_pushboolean(L, false /* close */);
+ lua_pushpointer(L, ep);
+ lua_pushstring(L, "FIXME:endpoint-identifier");
+ if (lua_pcall(L, 3, 0, 0)) {
+ kr_log_error("failed to close FIXME:endpoint-identifier: %s\n",
+ lua_tostring(L, -1));
+ }
+}
+
+static void endpoint_close(struct network *net, struct endpoint *ep, bool force)
+{
+ const bool is_control = ep->flags.kind && strcmp(ep->flags.kind, "control") == 0;
+ const bool is_xdp = ep->family == AF_XDP;
+
+ if (ep->family == AF_UNIX) { /* The FS name would be left behind. */
+ /* Extract local address for this socket. */
+ struct sockaddr_un sa;
+ sa.sun_path[0] = '\0'; /*< probably only for lint:scan-build */
+ socklen_t addr_len = sizeof(sa);
+ if (getsockname(ep->fd, (struct sockaddr *)&sa, &addr_len)
+ || unlink(sa.sun_path)) {
+ kr_log_error("error (ignored) when closing unix socket (fd = %d): %s\n",
+ ep->fd, strerror(errno));
+ return;
+ }
+ }
+
+ if (ep->flags.kind && !is_control && !is_xdp) {
+ assert(!ep->handle);
+ /* Special lua-handled endpoint. */
+ if (ep->engaged) {
+ endpoint_close_lua_cb(net, ep);
+ }
+ if (ep->fd > 0) {
+ close(ep->fd); /* nothing to do with errors */
+ }
+ free_const(ep->flags.kind);
+ return;
+ }
+
+ free_const(ep->flags.kind); /* needed if (is_control) */
+ assert(ep->handle);
+ if (force) { /* Force close if event loop isn't running. */
+ if (ep->fd >= 0) {
+ close(ep->fd);
+ }
+ if (ep->handle) {
+ ep->handle->loop = NULL;
+ io_free(ep->handle);
+ }
+ } else { /* Asynchronous close */
+ uv_close(ep->handle, io_free);
+ }
+}
+
+/** Endpoint visitor (see @file map.h) */
+static int close_key(const char *key, void *val, void *net)
+{
+ endpoint_array_t *ep_array = val;
+ for (int i = 0; i < ep_array->len; ++i) {
+ endpoint_close(net, &ep_array->at[i], true);
+ }
+ return 0;
+}
+
+static int free_key(const char *key, void *val, void *ext)
+{
+ endpoint_array_t *ep_array = val;
+ array_clear(*ep_array);
+ free(ep_array);
+ return kr_ok();
+}
+
+int kind_unregister(trie_val_t *tv, void *L)
+{
+ int fun_id = (char *)*tv - (char *)NULL;
+ luaL_unref(L, LUA_REGISTRYINDEX, fun_id);
+ return 0;
+}
+
+void network_close_force(struct network *net)
+{
+ if (net != NULL) {
+ map_walk(&net->endpoints, close_key, net);
+ map_walk(&net->endpoints, free_key, 0);
+ map_clear(&net->endpoints);
+ }
+}
+
+void network_deinit(struct network *net)
+{
+ if (net != NULL) {
+ network_close_force(net);
+ trie_apply(net->endpoint_kinds, kind_unregister, the_worker->engine->L);
+ trie_free(net->endpoint_kinds);
+
+ tls_credentials_free(net->tls_credentials);
+ tls_client_params_free(net->tls_client_params);
+ tls_session_ticket_ctx_destroy(net->tls_session_ticket_ctx);
+ #ifndef NDEBUG
+ memset(net, 0, sizeof(*net));
+ #endif
+ }
+}
+
+/** Fetch or create endpoint array and insert endpoint (shallow memcpy). */
+static int insert_endpoint(struct network *net, const char *addr, struct endpoint *ep)
+{
+ /* Fetch or insert address into map */
+ endpoint_array_t *ep_array = map_get(&net->endpoints, addr);
+ if (ep_array == NULL) {
+ ep_array = malloc(sizeof(*ep_array));
+ if (ep_array == NULL) {
+ return kr_error(ENOMEM);
+ }
+ if (map_set(&net->endpoints, addr, ep_array) != 0) {
+ free(ep_array);
+ return kr_error(ENOMEM);
+ }
+ array_init(*ep_array);
+ }
+
+ if (array_reserve(*ep_array, ep_array->len + 1)) {
+ return kr_error(ENOMEM);
+ }
+ memcpy(&ep_array->at[ep_array->len++], ep, sizeof(*ep));
+ return kr_ok();
+}
+
+/** Open endpoint protocols. ep->flags were pre-set.
+ * \p addr_str is only used for logging or for XDP "address". */
+static int open_endpoint(struct network *net, const char *addr_str,
+ struct endpoint *ep, const struct sockaddr *sa)
+{
+ const bool is_control = ep->flags.kind && strcmp(ep->flags.kind, "control") == 0;
+ const bool is_xdp = ep->family == AF_XDP;
+ bool ok = is_xdp
+ ? sa == NULL && ep->fd == -1 && ep->nic_queue >= 0
+ && ep->flags.sock_type == SOCK_DGRAM && !ep->flags.tls
+ : (sa != NULL) != (ep->fd != -1);
+ if (!ok) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+ if (ep->handle) {
+ return kr_error(EEXIST);
+ }
+
+ if (sa) {
+ if (sa->sa_family == AF_UNIX) {
+ struct sockaddr_un *sun = (struct sockaddr_un*)sa;
+ char *dirc = strdup(sun->sun_path);
+ char *dname = dirname(dirc);
+ (void)unlink(sun->sun_path); /** Attempt to unlink if socket path exists. */
+ (void)mkdir(dname, S_IRWXU|S_IRWXG); /** Attempt to create dir. */
+ free(dirc);
+ }
+ ep->fd = io_bind(sa, ep->flags.sock_type, &ep->flags);
+ if (ep->fd < 0) return ep->fd;
+ }
+ if (ep->flags.kind && !is_control && !is_xdp) {
+ /* This EP isn't to be managed internally after binding. */
+ return endpoint_open_lua_cb(net, ep, addr_str);
+ } else {
+ ep->engaged = true;
+ /* .engaged seems not really meaningful in this case, but... */
+ }
+
+ int ret;
+ if (is_control) {
+ uv_pipe_t *ep_handle = malloc(sizeof(uv_pipe_t));
+ ep->handle = (uv_handle_t *)ep_handle;
+ ret = !ep->handle ? ENOMEM
+ : io_listen_pipe(net->loop, ep_handle, ep->fd);
+ goto finish_ret;
+ }
+
+ if (ep->family == AF_UNIX) {
+ /* Some parts of connection handling would need more work,
+ * so let's support AF_UNIX only with .kind != NULL for now. */
+ kr_log_error("[system] AF_UNIX only supported with set { kind = '...' }\n");
+ ret = EAFNOSUPPORT;
+ goto finish_ret;
+ /*
+ uv_pipe_t *ep_handle = malloc(sizeof(uv_pipe_t));
+ */
+ }
+
+ if (is_xdp) {
+ #if ENABLE_XDP
+ uv_poll_t *ep_handle = malloc(sizeof(uv_poll_t));
+ ep->handle = (uv_handle_t *)ep_handle;
+ ret = !ep->handle ? ENOMEM
+ : io_listen_xdp(net->loop, ep, addr_str);
+ #else
+ ret = ESOCKTNOSUPPORT;
+ #endif
+ goto finish_ret;
+ } /* else */
+
+ if (ep->flags.sock_type == SOCK_DGRAM) {
+ if (ep->flags.tls) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+ uv_udp_t *ep_handle = malloc(sizeof(uv_udp_t));
+ ep->handle = (uv_handle_t *)ep_handle;
+ ret = !ep->handle ? ENOMEM
+ : io_listen_udp(net->loop, ep_handle, ep->fd);
+ goto finish_ret;
+ } /* else */
+
+ if (ep->flags.sock_type == SOCK_STREAM) {
+ uv_tcp_t *ep_handle = malloc(sizeof(uv_tcp_t));
+ ep->handle = (uv_handle_t *)ep_handle;
+ ret = !ep->handle ? ENOMEM
+ : io_listen_tcp(net->loop, ep_handle, ep->fd,
+ net->tcp_backlog, ep->flags.tls, ep->flags.http);
+ goto finish_ret;
+ } /* else */
+
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+finish_ret:
+ if (!ret) return ret;
+ free(ep->handle);
+ ep->handle = NULL;
+ return kr_error(ret);
+}
+
+/** @internal Fetch a pointer to endpoint of given parameters (or NULL).
+ * Beware that there might be multiple matches, though that's not common.
+ * The matching isn't really precise in the sense that it might not find
+ * and endpoint that would *collide* the passed one. */
+static struct endpoint * endpoint_get(struct network *net, const char *addr,
+ uint16_t port, endpoint_flags_t flags)
+{
+ endpoint_array_t *ep_array = map_get(&net->endpoints, addr);
+ if (!ep_array) {
+ return NULL;
+ }
+ for (int i = 0; i < ep_array->len; ++i) {
+ struct endpoint *ep = &ep_array->at[i];
+ if (ep->port == port && endpoint_flags_eq(ep->flags, flags)) {
+ return ep;
+ }
+ }
+ return NULL;
+}
+
+/** \note pass (either sa != NULL xor ep.fd != -1) or XDP case (neither sa nor ep.fd)
+ * \note in XDP case addr_str is interface name
+ * \note ownership of ep.flags.* is taken on success. */
+static int create_endpoint(struct network *net, const char *addr_str,
+ struct endpoint *ep, const struct sockaddr *sa)
+{
+ int ret = open_endpoint(net, addr_str, ep, sa);
+ if (ret == 0) {
+ ret = insert_endpoint(net, addr_str, ep);
+ }
+ if (ret != 0 && ep->handle) {
+ endpoint_close(net, ep, false);
+ }
+ return ret;
+}
+
+int network_listen_fd(struct network *net, int fd, endpoint_flags_t flags)
+{
+ if (flags.xdp) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+ /* Extract fd's socket type. */
+ socklen_t len = sizeof(flags.sock_type);
+ int ret = getsockopt(fd, SOL_SOCKET, SO_TYPE, &flags.sock_type, &len);
+ if (ret != 0) {
+ return kr_error(errno);
+ }
+ if (flags.sock_type == SOCK_DGRAM && !flags.kind && flags.tls) {
+ assert(!EINVAL); /* Perhaps DTLS some day. */
+ return kr_error(EINVAL);
+ }
+ if (flags.sock_type != SOCK_DGRAM && flags.sock_type != SOCK_STREAM) {
+ return kr_error(EBADF);
+ }
+
+ /* Extract local address for this socket. */
+ struct sockaddr_storage ss = { .ss_family = AF_UNSPEC };
+ socklen_t addr_len = sizeof(ss);
+ ret = getsockname(fd, (struct sockaddr *)&ss, &addr_len);
+ if (ret != 0) {
+ return kr_error(errno);
+ }
+
+ struct endpoint ep = {
+ .flags = flags,
+ .family = ss.ss_family,
+ .fd = fd,
+ };
+ /* Extract address string and port. */
+ char addr_buf[INET6_ADDRSTRLEN]; /* https://tools.ietf.org/html/rfc4291 */
+ const char *addr_str;
+ switch (ep.family) {
+ case AF_INET:
+ ret = uv_ip4_name((const struct sockaddr_in*)&ss, addr_buf, sizeof(addr_buf));
+ addr_str = addr_buf;
+ ep.port = ntohs(((struct sockaddr_in *)&ss)->sin_port);
+ break;
+ case AF_INET6:
+ ret = uv_ip6_name((const struct sockaddr_in6*)&ss, addr_buf, sizeof(addr_buf));
+ addr_str = addr_buf;
+ ep.port = ntohs(((struct sockaddr_in6 *)&ss)->sin6_port);
+ break;
+ case AF_UNIX:
+ /* No SOCK_DGRAM with AF_UNIX support, at least for now. */
+ ret = flags.sock_type == SOCK_STREAM ? kr_ok() : kr_error(EAFNOSUPPORT);
+ addr_str = ((struct sockaddr_un *)&ss)->sun_path;
+ break;
+ default:
+ ret = kr_error(EAFNOSUPPORT);
+ }
+ if (ret) return ret;
+
+ /* always create endpoint for supervisor supplied fd
+ * even if addr+port is not unique */
+ return create_endpoint(net, addr_str, &ep, NULL);
+}
+
+/** Try selecting XDP queue automatically. */
+static int16_t nic_queue_auto(void)
+{
+ const char *inst_str = getenv("SYSTEMD_INSTANCE");
+ if (!inst_str)
+ return 0; // should work OK for simple (single-kresd) deployments
+ char *endp;
+ errno = 0; // strtol() is special in this respect
+ long inst = strtol(inst_str, &endp, 10);
+ if (!errno && *endp == '\0' && inst > 0 && inst < UINT16_MAX)
+ return inst - 1; // 1-based vs. 0-based indexing conventions
+ return -1;
+}
+
+int network_listen(struct network *net, const char *addr, uint16_t port,
+ int16_t nic_queue, endpoint_flags_t flags)
+{
+ if (net == NULL || addr == 0 || nic_queue < -1) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+
+ if (flags.xdp && nic_queue < 0) {
+ nic_queue = nic_queue_auto();
+ if (nic_queue < 0) {
+ return kr_error(EINVAL);
+ }
+ }
+
+ // Try parsing the address.
+ const struct sockaddr *sa = kr_straddr_socket(addr, port, NULL);
+ if (!sa && !flags.xdp) { // unusable address spec
+ return kr_error(EINVAL);
+ }
+ char ifname_buf[64] UNUSED;
+ if (sa && flags.xdp) { // auto-detection: address -> interface
+ #if ENABLE_XDP
+ int ret = knot_eth_name_from_addr((const struct sockaddr_storage *)sa,
+ ifname_buf, sizeof(ifname_buf));
+ // even on success we don't want to pass `sa` on
+ free_const(sa);
+ sa = NULL;
+ if (ret) {
+ return kr_error(ret);
+ }
+ addr = ifname_buf;
+ #else
+ return kr_error(ESOCKTNOSUPPORT);
+ #endif
+ }
+ // XDP: if addr failed to parse as address, we assume it's an interface name.
+
+ if (endpoint_get(net, addr, port, flags)) {
+ return kr_error(EADDRINUSE); // Already listening
+ }
+
+ struct endpoint ep = { 0 };
+ ep.flags = flags;
+ ep.fd = -1;
+ ep.port = port;
+ ep.family = flags.xdp ? AF_XDP : sa->sa_family;
+ ep.nic_queue = nic_queue;
+
+ int ret = create_endpoint(net, addr, &ep, sa);
+
+ // Error reporting: more precision.
+ if (ret == KNOT_EINVAL && !sa && flags.xdp && ENABLE_XDP) {
+ if (!if_nametoindex(addr) && errno == ENODEV) {
+ ret = kr_error(ENODEV);
+ }
+ }
+
+ free_const(sa);
+ return ret;
+}
+
+int network_close(struct network *net, const char *addr, int port)
+{
+ endpoint_array_t *ep_array = map_get(&net->endpoints, addr);
+ if (!ep_array) {
+ return kr_error(ENOENT);
+ }
+
+ size_t i = 0;
+ bool matched = false; /*< at least one match */
+ while (i < ep_array->len) {
+ struct endpoint *ep = &ep_array->at[i];
+ if (port < 0 || ep->port == port) {
+ endpoint_close(net, ep, false);
+ array_del(*ep_array, i);
+ matched = true;
+ /* do not advance i */
+ } else {
+ ++i;
+ }
+ }
+ if (!matched) {
+ return kr_error(ENOENT);
+ }
+
+ /* Collapse key if it has no endpoint. */
+ if (ep_array->len == 0) {
+ array_clear(*ep_array);
+ free(ep_array);
+ map_del(&net->endpoints, addr);
+ }
+
+ return kr_ok();
+}
+
+void network_new_hostname(struct network *net, struct engine *engine)
+{
+ if (net->tls_credentials &&
+ net->tls_credentials->ephemeral_servicename) {
+ struct tls_credentials *newcreds;
+ newcreds = tls_get_ephemeral_credentials(engine);
+ if (newcreds) {
+ tls_credentials_release(net->tls_credentials);
+ net->tls_credentials = newcreds;
+ kr_log_info("[tls] Updated ephemeral X.509 cert with new hostname\n");
+ } else {
+ kr_log_error("[tls] Failed to update ephemeral X.509 cert with new hostname, using existing one\n");
+ }
+ }
+}
+
+#ifdef SO_ATTACH_BPF
+static int set_bpf_cb(const char *key, void *val, void *ext)
+{
+ endpoint_array_t *endpoints = (endpoint_array_t *)val;
+ assert(endpoints != NULL);
+ int *bpffd = (int *)ext;
+ assert(bpffd != NULL);
+
+ for (size_t i = 0; i < endpoints->len; i++) {
+ struct endpoint *endpoint = &endpoints->at[i];
+ uv_os_fd_t sockfd = -1;
+ if (endpoint->handle != NULL)
+ uv_fileno(endpoint->handle, &sockfd);
+ assert(sockfd != -1);
+
+ if (setsockopt(sockfd, SOL_SOCKET, SO_ATTACH_BPF, bpffd, sizeof(int)) != 0) {
+ return 1; /* return error (and stop iterating over net->endpoints) */
+ }
+ }
+ return 0; /* OK */
+}
+#endif
+
+int network_set_bpf(struct network *net, int bpf_fd)
+{
+#ifdef SO_ATTACH_BPF
+ if (map_walk(&net->endpoints, set_bpf_cb, &bpf_fd) != 0) {
+ /* set_bpf_cb() has returned error. */
+ network_clear_bpf(net);
+ return 0;
+ }
+#else
+ kr_log_error("[network] SO_ATTACH_BPF socket option doesn't supported\n");
+ (void)net;
+ (void)bpf_fd;
+ return 0;
+#endif
+ return 1;
+}
+
+#ifdef SO_DETACH_BPF
+static int clear_bpf_cb(const char *key, void *val, void *ext)
+{
+ endpoint_array_t *endpoints = (endpoint_array_t *)val;
+ assert(endpoints != NULL);
+
+ for (size_t i = 0; i < endpoints->len; i++) {
+ struct endpoint *endpoint = &endpoints->at[i];
+ uv_os_fd_t sockfd = -1;
+ if (endpoint->handle != NULL)
+ uv_fileno(endpoint->handle, &sockfd);
+ assert(sockfd != -1);
+
+ if (setsockopt(sockfd, SOL_SOCKET, SO_DETACH_BPF, NULL, 0) != 0) {
+ kr_log_error("[network] failed to clear SO_DETACH_BPF socket option\n");
+ }
+ /* Proceed even if setsockopt() failed,
+ * as we want to process all opened sockets. */
+ }
+ return 0;
+}
+#endif
+
+void network_clear_bpf(struct network *net)
+{
+#ifdef SO_DETACH_BPF
+ map_walk(&net->endpoints, clear_bpf_cb, NULL);
+#else
+ kr_log_error("[network] SO_DETACH_BPF socket option doesn't supported\n");
+ (void)net;
+#endif
+}
diff --git a/daemon/network.h b/daemon/network.h
new file mode 100644
index 0000000..8cc8fcf
--- /dev/null
+++ b/daemon/network.h
@@ -0,0 +1,130 @@
+/* Copyright (C) 2015-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "daemon/tls.h"
+
+#include "lib/generic/array.h"
+#include "lib/generic/map.h"
+#include "lib/generic/trie.h"
+
+#include <uv.h>
+#include <stdbool.h>
+
+#include <sys/socket.h>
+#ifndef AF_XDP
+#define AF_XDP 44
+#endif
+
+struct engine;
+struct session;
+
+/** Ways to listen on a socket (which may exist already). */
+typedef struct {
+ int sock_type; /**< SOCK_DGRAM or SOCK_STREAM */
+ bool tls; /**< only used together with .kind == NULL and SOCK_STREAM */
+ bool http; /**< DoH2, implies .tls (in current implementation) */
+ bool xdp; /**< XDP is special (not a normal socket, in particular) */
+ bool freebind; /**< used for binding to non-local address */
+ const char *kind; /**< tag for other types: "control" or module-handled kinds */
+} endpoint_flags_t;
+
+static inline bool endpoint_flags_eq(endpoint_flags_t f1, endpoint_flags_t f2)
+{
+ if (f1.sock_type != f2.sock_type)
+ return false;
+ if (f1.kind && f2.kind)
+ return strcasecmp(f1.kind, f2.kind);
+ else
+ return f1.tls == f2.tls && f1.kind == f2.kind;
+}
+
+/** Wrapper for a single socket to listen on.
+ * There are two types: normal have handle, special have flags.kind (and never both).
+ *
+ * LATER: .family might be unexpected for IPv4-in-IPv6 addresses.
+ * ATM AF_UNIX is only supported with flags.kind != NULL
+ */
+struct endpoint {
+ /** uv_{udp,tcp,poll}_t (poll for XDP);
+ * NULL in case of endpoints that are to be handled by modules. */
+ uv_handle_t *handle;
+ int fd; /**< POSIX file-descriptor; always used. */
+ int family; /**< AF_INET or AF_INET6 or AF_UNIX or AF_XDP */
+ uint16_t port; /**< TCP/UDP port. Meaningless with AF_UNIX. */
+ int16_t nic_queue; /**< -1 or queue number of the interface for AF_XDP use. */
+ bool engaged; /**< to some module or internally */
+ endpoint_flags_t flags;
+};
+
+/** @cond internal Array of endpoints */
+typedef array_t(struct endpoint) endpoint_array_t;
+/* @endcond */
+
+struct net_tcp_param {
+ uint64_t in_idle_timeout;
+ uint64_t tls_handshake_timeout;
+};
+
+struct network {
+ uv_loop_t *loop;
+
+ /** Map: address string -> endpoint_array_t.
+ * \note even same address-port-flags tuples may appear.
+ * TODO: trie_t, keyed on *binary* address-port pair. */
+ map_t endpoints;
+
+ /** Registry of callbacks for special endpoint kinds (for opening/closing).
+ * Map: kind (lowercased) -> lua function ID converted to void *
+ * The ID is the usual: raw int index in the LUA_REGISTRYINDEX table. */
+ trie_t *endpoint_kinds;
+ /** See network_engage_endpoints() */
+ bool missing_kind_is_error;
+
+ struct tls_credentials *tls_credentials;
+ tls_client_params_t *tls_client_params; /**< Use tls_client_params_*() functions. */
+ struct tls_session_ticket_ctx *tls_session_ticket_ctx;
+ struct net_tcp_param tcp;
+ int tcp_backlog;
+};
+
+void network_init(struct network *net, uv_loop_t *loop, int tcp_backlog);
+void network_deinit(struct network *net);
+
+/** Start listenting on addr#port with flags.
+ * \note if we did listen on that combination already,
+ * nothing is done and kr_error(EADDRINUSE) is returned.
+ * \note there's no short-hand to listen both on UDP and TCP.
+ * \note ownership of flags.* is taken on success. TODO: non-success?
+ * \param nic_queue == -1 for auto-selection or non-XDP.
+ * \note In XDP mode, addr may be also interface name, so kr_error(ENODEV)
+ * is returned if some nonsense is passed
+ */
+int network_listen(struct network *net, const char *addr, uint16_t port,
+ int16_t nic_queue, endpoint_flags_t flags);
+
+/** Start listenting on an open file-descriptor.
+ * \note flags.sock_type isn't meaningful here.
+ * \note ownership of flags.* is taken on success. TODO: non-success?
+ */
+int network_listen_fd(struct network *net, int fd, endpoint_flags_t flags);
+
+/** Stop listening on all endpoints with matching addr#port.
+ * port < 0 serves as a wild-card.
+ * \return kr_error(ENOENT) if nothing matched. */
+int network_close(struct network *net, const char *addr, int port);
+
+/** Close all endpoints immediately (no waiting for UV loop). */
+void network_close_force(struct network *net);
+
+/** Enforce that all endpoints are registered from now on.
+ * This only does anything with struct endpoint::flags.kind != NULL. */
+int network_engage_endpoints(struct network *net);
+
+int network_set_tls_cert(struct network *net, const char *cert);
+int network_set_tls_key(struct network *net, const char *key);
+void network_new_hostname(struct network *net, struct engine *engine);
+int network_set_bpf(struct network *net, int bpf_fd);
+void network_clear_bpf(struct network *net);
diff --git a/daemon/scripting.rst b/daemon/scripting.rst
new file mode 100644
index 0000000..629855c
--- /dev/null
+++ b/daemon/scripting.rst
@@ -0,0 +1,396 @@
+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _runtime-cfg:
+
+Run-time reconfiguration
+========================
+
+Knot Resolver offers several ways to modify its configuration at run-time:
+
+ - Using control socket driven by an external system
+ - Using Lua program embeded in Resolver's configuration file
+
+Both ways can also be combined: For example the configuration file can contain
+a little Lua function which gathers statistics and returns them in JSON string.
+This can be used by an external system which uses control socket to call this
+user-defined function and to retrieve its results.
+
+
+.. _control-sockets:
+
+Control sockets
+---------------
+Control socket acts like "an interactive configuration file" so all actions
+available in configuration file can be executed interactively using the control
+socket. One possible use-case is reconfiguring the resolver instances from
+another program, e.g. a maintenance script.
+
+.. note:: Each instance of Knot Resolver exposes its own control socket. Take
+ that into account when scripting deployments with
+ :ref:`systemd-multiple-instances`.
+
+When Knot Resolver is started using Systemd (see section
+:ref:`quickstart-startup`) it creates a control socket in path
+``/run/knot-resolver/control/$ID``. Connection to the socket can
+be made from command line using e.g. ``socat``:
+
+.. code-block:: bash
+
+ $ socat - UNIX-CONNECT:/run/knot-resolver/control/1
+
+When successfully connected to a socket, the command line should change to
+something like ``>``. Then you can interact with kresd to see configuration or
+set a new one. There are some basic commands to start with.
+
+.. code-block:: lua
+
+ > help() -- shows help
+ > net.interfaces() -- lists available interfaces
+ > net.list() -- lists running network services
+
+
+The *direct output* of commands sent over socket is captured and sent back,
+while also printed to the daemon standard outputs (in :func:`verbose` mode).
+This gives you an immediate response on the outcome of your command. Error or
+debug logs aren't captured, but you can find them in the daemon standard
+outputs.
+
+Control sockets are also a way to enumerate and test running instances, the
+list of sockets corresponds to the list of processes, and you can test the
+process for liveliness by connecting to the UNIX socket.
+
+.. function:: map(lua_snippet)
+
+ Executes the provided string as lua code on every running resolver instance
+ and returns the results as a table.
+
+ Key ``n`` is always present in the returned table and specifies the total
+ number of instances the command was executed on. The table also contains
+ results from each instance accessible through keys ``1`` to ``n``
+ (inclusive). If any instance returns ``nil``, it is not explicitly part of
+ the table, but you can detect it by iterating through ``1`` to ``n``.
+
+ .. code-block:: lua
+
+ > map('worker.id') -- return an ID of every active instance
+ {
+ '2',
+ '1',
+ ['n'] = 2,
+ }
+ > map('worker.id == "1" or nil') -- example of `nil` return value
+ {
+ [2] = true,
+ ['n'] = 2,
+ }
+
+ The order of instances isn't guaranteed or stable. When you need to identify
+ the instances, you may use ``kluautil.kr_table_pack()`` function to return multiple
+ values as a table. It uses similar semantics with ``n`` as described above
+ to allow ``nil`` values.
+
+ .. code-block:: lua
+
+ > map('require("kluautil").kr_table_pack(worker.id, stats.get("answer.total"))')
+ {
+ {
+ '2',
+ 42,
+ ['n'] = 2,
+ },
+ {
+ '1',
+ 69,
+ ['n'] = 2,
+ },
+ ['n'] = 2,
+ }
+
+ If the command fails on any instance, an error is returned and the execution
+ is in an undefined state (the command might not have been executed on all
+ instances). When using the ``map()`` function to execute any code that might
+ fail, your code should be wrapped in `pcall()
+ <https://www.lua.org/manual/5.1/manual.html#pdf-pcall>`_ to avoid this
+ issue.
+
+ .. code-block:: lua
+
+ > map('require("kluautil").kr_table_pack(pcall(net.tls, "cert.pem", "key.pem"))')
+ {
+ {
+ true, -- function suceeded
+ true, -- function return value(s)
+ ['n'] = 2,
+ },
+ {
+ false, -- function failed
+ 'error occurred...', -- the returned error message
+ ['n'] = 2,
+ },
+ ['n'] = 2,
+ }
+
+
+Lua scripts
+-----------
+
+As it was mentioned in section :ref:`config-syntax`, Resolver's configuration
+file contains program in Lua programming language. This allows you to write
+dynamic rules and helps you to avoid repetitive templating that is unavoidable
+with static configuration. For example parts of configuration can depend on
+:func:`hostname` of the machine:
+
+.. code-block:: lua
+
+ if hostname() == 'hidden' then
+ net.listen(net.eth0, 5353)
+ else
+ net.listen('127.0.0.1')
+ net.listen(net.eth1.addr[1])
+ end
+
+Another example would show how it is possible to bind to all interfaces, using
+iteration.
+
+.. code-block:: lua
+
+ for name, addr_list in pairs(net.interfaces()) do
+ net.listen(addr_list)
+ end
+
+.. tip:: Some users observed a considerable, close to 100%, performance gain in
+ Docker containers when they bound the daemon to a single interface:ip
+ address pair. One may expand the aforementioned example with browsing
+ available addresses as:
+
+ .. code-block:: lua
+
+ addrpref = env.EXPECTED_ADDR_PREFIX
+ for k, v in pairs(addr_list["addr"]) do
+ if string.sub(v,1,string.len(addrpref)) == addrpref then
+ net.listen(v)
+ ...
+
+You can also use third-party Lua libraries (available for example through
+LuaRocks_) as on this example to download cache from parent,
+to avoid cold-cache start.
+
+.. code-block:: lua
+
+ local http = require('socket.http')
+ local ltn12 = require('ltn12')
+
+ local cache_size = 100*MB
+ local cache_path = '/var/cache/knot-resolver'
+ cache.open(cache_size, 'lmdb://' .. cache_path)
+ if cache.count() == 0 then
+ cache.close()
+ -- download cache from parent
+ http.request {
+ url = 'http://parent/data.mdb',
+ sink = ltn12.sink.file(io.open(cache_path .. '/data.mdb', 'w'))
+ }
+ -- reopen cache with 100M limit
+ cache.open(cache_size, 'lmdb://' .. cache_path)
+ end
+
+Helper functions
+^^^^^^^^^^^^^^^^
+Following built-in functions are useful for scripting:
+
+.. envvar:: env (table)
+
+ Retrieve environment variables.
+
+ Example:
+
+ .. code-block:: lua
+
+ env.USER -- equivalent to $USER in shell
+
+.. function:: fromjson(JSONstring)
+
+ :return: Lua representation of data in JSON string.
+
+ Example:
+
+ .. code-block:: lua
+
+ > fromjson('{"key1": "value1", "key2": {"subkey1": 1, "subkey2": 2}}')
+ [key1] => value1
+ [key2] => {
+ [subkey1] => 1
+ [subkey2] => 2
+ }
+
+
+.. function:: hostname([fqdn])
+
+ :return: Machine hostname.
+
+ If called with a parameter, it will set kresd's internal
+ hostname. If called without a parameter, it will return kresd's
+ internal hostname, or the system's POSIX hostname (see
+ gethostname(2)) if kresd's internal hostname is unset.
+
+ This also affects ephemeral (self-signed) certificates generated by kresd
+ for DNS over TLS.
+
+.. function:: package_version()
+
+ :return: Current package version as string.
+
+ Example:
+
+ .. code-block:: lua
+
+ > package_version()
+ 2.1.1
+
+.. function:: resolve(name, type[, class = kres.class.IN, options = {}, finish = nil, init = nil])
+
+ :param string name: Query name (e.g. 'com.')
+ :param number type: Query type (e.g. ``kres.type.NS``)
+ :param number class: Query class *(optional)* (e.g. ``kres.class.IN``)
+ :param strings options: Resolution options (see :c:type:`kr_qflags`)
+ :param function finish: Callback to be executed when resolution completes (e.g. `function cb (pkt, req) end`). The callback gets a packet containing the final answer and doesn't have to return anything.
+ :param function init: Callback to be executed with the :c:type:`kr_request` before resolution starts.
+ :return: boolean, ``true`` if resolution was started
+
+ The function can also be executed with a table of arguments instead. This is
+ useful if you'd like to skip some arguments, for example:
+
+ .. code-block:: lua
+
+ resolve {
+ name = 'example.com',
+ type = kres.type.AAAA,
+ init = function (req)
+ end,
+ }
+
+ Example:
+
+ .. code-block:: lua
+
+ -- Send query for root DNSKEY, ignore cache
+ resolve('.', kres.type.DNSKEY, kres.class.IN, 'NO_CACHE')
+
+ -- Query for AAAA record
+ resolve('example.com', kres.type.AAAA, kres.class.IN, 0,
+ function (pkt, req)
+ -- Check answer RCODE
+ if pkt:rcode() == kres.rcode.NOERROR then
+ -- Print matching records
+ local records = pkt:section(kres.section.ANSWER)
+ for i = 1, #records do
+ local rr = records[i]
+ if rr.type == kres.type.AAAA then
+ print ('record:', kres.rr2str(rr))
+ end
+ end
+ else
+ print ('rcode: ', pkt:rcode())
+ end
+ end)
+
+
+.. function:: tojson(object)
+
+ :return: JSON text representation of `object`.
+
+ Example:
+
+ .. code-block:: lua
+
+ > testtable = { key1 = "value1", "key2" = { subkey1 = 1, subkey2 = 2 } }
+ > tojson(testtable)
+ {"key1":"value1","key2":{"subkey1":1,"subkey2":2}}
+
+
+.. _async-events:
+
+Asynchronous events
+-------------------
+
+Lua language used in configuration file allows you to script actions upon
+various events, for example publish statistics each minute. Following example
+uses built-in function :func:`event.recurrent()` which calls user-supplied
+anonymous function:
+
+.. code-block:: lua
+
+ modules.load('stats')
+
+ -- log statistics every second
+ local stat_id = event.recurrent(1 * second, function(evid)
+ log(table_print(stats.list()))
+ end)
+
+ -- stop printing statistics after first minute
+ event.after(1 * minute, function(evid)
+ event.cancel(stat_id)
+ end)
+
+
+Note that each scheduled event is identified by a number valid for the duration
+of the event, you may use it to cancel the event at any time.
+
+To persist state between two invocations of a fuction Lua uses concept called
+closures_. In the following example function ``speed_monitor()`` is a closure
+function, which provides persistent variable called ``previous``.
+
+.. code-block:: lua
+
+ modules.load('stats')
+
+ -- make a closure, encapsulating counter
+ function speed_monitor()
+ local previous = stats.list()
+ -- monitoring function
+ return function(evid)
+ local now = stats.list()
+ local total_increment = now['answer.total'] - previous['answer.total']
+ local slow_increment = now['answer.slow'] - previous['answer.slow']
+ if slow_increment / total_increment > 0.05 then
+ log('WARNING! More than 5 %% of queries was slow!')
+ end
+ previous = now -- store current value in closure
+ end
+ end
+
+ -- monitor every minute
+ local monitor_id = event.recurrent(1 * minute, speed_monitor())
+
+Another type of actionable event is activity on a file descriptor. This allows
+you to embed other event loops or monitor open files and then fire a callback
+when an activity is detected. This allows you to build persistent services
+like monitoring probes that cooperate well with the daemon internal operations.
+See :func:`event.socket()`.
+
+Filesystem watchers are possible with :func:`worker.coroutine()` and cqueues_,
+see the cqueues documentation for more information. Here is an simple example:
+
+.. code-block:: lua
+
+ local notify = require('cqueues.notify')
+ local watcher = notify.opendir('/etc')
+ watcher:add('hosts')
+
+ -- Watch changes to /etc/hosts
+ worker.coroutine(function ()
+ for flags, name in watcher:changes() do
+ for flag in notify.flags(flags) do
+ -- print information about the modified file
+ print(name, notify[flag])
+ end
+ end
+ end)
+
+.. include:: ../daemon/bindings/event.rst
+
+.. include:: ../modules/etcd/README.rst
+
+.. _closures: https://www.lua.org/pil/6.1.html
+.. _cqueues: https://25thandclement.com/~william/projects/cqueues.html
+.. _LuaRocks: https://luarocks.org/
diff --git a/daemon/session.c b/daemon/session.c
new file mode 100644
index 0000000..8f97b68
--- /dev/null
+++ b/daemon/session.c
@@ -0,0 +1,806 @@
+/* Copyright (C) 2018-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <assert.h>
+
+#include <libknot/packet/pkt.h>
+
+#include "lib/defines.h"
+#include "daemon/session.h"
+#include "daemon/engine.h"
+#include "daemon/tls.h"
+#include "daemon/http.h"
+#include "daemon/worker.h"
+#include "daemon/io.h"
+#include "lib/generic/queue.h"
+
+#define TLS_CHUNK_SIZE (16 * 1024)
+
+/* Initial max frame size: https://tools.ietf.org/html/rfc7540#section-6.5.2 */
+#define HTTP_MAX_FRAME_SIZE 16384
+
+/* Per-socket (TCP or UDP) persistent structure.
+ *
+ * In particular note that for UDP clients it's just one session (per socket)
+ * shared for all clients. For TCP/TLS it's also for the connection-specific socket,
+ * i.e one session per connection.
+ *
+ * LATER(optim.): the memory here is used a bit wastefully.
+ */
+struct session {
+ struct session_flags sflags; /**< miscellaneous flags. */
+ union inaddr peer; /**< address of peer; not for UDP clients (downstream) */
+ union inaddr sockname; /**< our local address; for UDP it may be a wildcard */
+ uv_handle_t *handle; /**< libuv handle for IO operations. */
+ uv_timer_t timeout; /**< libuv handle for timer. */
+
+ struct tls_ctx *tls_ctx; /**< server side tls-related data. */
+ struct tls_client_ctx *tls_client_ctx; /**< client side tls-related data. */
+
+#if ENABLE_DOH2
+ struct http_ctx *http_ctx; /**< server side http-related data. */
+#endif
+
+ trie_t *tasks; /**< list of tasks assotiated with given session. */
+ queue_t(struct qr_task *) waiting; /**< list of tasks waiting for sending to upstream. */
+
+ uint8_t *wire_buf; /**< Buffer for DNS message, except for XDP. */
+ ssize_t wire_buf_size; /**< Buffer size. */
+ ssize_t wire_buf_start_idx; /**< Data start offset in wire_buf. */
+ ssize_t wire_buf_end_idx; /**< Data end offset in wire_buf. */
+ uint64_t last_activity; /**< Time of last IO activity (if any occurs).
+ * Otherwise session creation time. */
+};
+
+static void on_session_close(uv_handle_t *handle)
+{
+ struct session *session = handle->data;
+ assert(session->handle == handle); (void)session;
+ io_free(handle);
+}
+
+static void on_session_timer_close(uv_handle_t *timer)
+{
+ struct session *session = timer->data;
+ uv_handle_t *handle = session->handle;
+ assert(handle && handle->data == session);
+ assert (session->sflags.outgoing || handle->type == UV_TCP);
+ if (!uv_is_closing(handle)) {
+ uv_close(handle, on_session_close);
+ }
+}
+
+void session_free(struct session *session)
+{
+ if (session) {
+ assert(session_is_empty(session));
+ session_clear(session);
+ free(session);
+ }
+}
+
+void session_clear(struct session *session)
+{
+ assert(session_is_empty(session));
+ if (session->handle && session->handle->type == UV_TCP) {
+ free(session->wire_buf);
+ }
+ trie_clear(session->tasks);
+ trie_free(session->tasks);
+ queue_deinit(session->waiting);
+ tls_free(session->tls_ctx);
+ tls_client_ctx_free(session->tls_client_ctx);
+#if ENABLE_DOH2
+ http_free(session->http_ctx);
+#endif
+ memset(session, 0, sizeof(*session));
+}
+
+void session_close(struct session *session)
+{
+ assert(session_is_empty(session));
+ if (session->sflags.closing) {
+ return;
+ }
+
+ uv_handle_t *handle = session->handle;
+ io_stop_read(handle);
+ session->sflags.closing = true;
+
+ if (!uv_is_closing((uv_handle_t *)&session->timeout)) {
+ uv_timer_stop(&session->timeout);
+ if (session->tls_client_ctx) {
+ tls_close(&session->tls_client_ctx->c);
+ }
+ if (session->tls_ctx) {
+ tls_close(&session->tls_ctx->c);
+ }
+
+ session->timeout.data = session;
+ uv_close((uv_handle_t *)&session->timeout, on_session_timer_close);
+ }
+}
+
+int session_start_read(struct session *session)
+{
+ return io_start_read(session->handle);
+}
+
+int session_stop_read(struct session *session)
+{
+ return io_stop_read(session->handle);
+}
+
+int session_waitinglist_push(struct session *session, struct qr_task *task)
+{
+ queue_push(session->waiting, task);
+ worker_task_ref(task);
+ return kr_ok();
+}
+
+struct qr_task *session_waitinglist_get(const struct session *session)
+{
+ return (queue_len(session->waiting) > 0) ? (queue_head(session->waiting)) : NULL;
+}
+
+struct qr_task *session_waitinglist_pop(struct session *session, bool deref)
+{
+ struct qr_task *t = session_waitinglist_get(session);
+ queue_pop(session->waiting);
+ if (deref) {
+ worker_task_unref(t);
+ }
+ return t;
+}
+
+int session_tasklist_add(struct session *session, struct qr_task *task)
+{
+ trie_t *t = session->tasks;
+ uint16_t task_msg_id = 0;
+ const char *key = NULL;
+ size_t key_len = 0;
+ if (session->sflags.outgoing) {
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ task_msg_id = knot_wire_get_id(pktbuf->wire);
+ key = (const char *)&task_msg_id;
+ key_len = sizeof(task_msg_id);
+ } else {
+ key = (const char *)&task;
+ key_len = sizeof(char *);
+ }
+ trie_val_t *v = trie_get_ins(t, key, key_len);
+ if (unlikely(!v)) {
+ assert(false);
+ return kr_error(ENOMEM);
+ }
+ if (*v == NULL) {
+ *v = task;
+ worker_task_ref(task);
+ } else if (*v != task) {
+ assert(false);
+ return kr_error(EINVAL);
+ }
+ return kr_ok();
+}
+
+int session_tasklist_del(struct session *session, struct qr_task *task)
+{
+ trie_t *t = session->tasks;
+ uint16_t task_msg_id = 0;
+ const char *key = NULL;
+ size_t key_len = 0;
+ trie_val_t val;
+ if (session->sflags.outgoing) {
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ task_msg_id = knot_wire_get_id(pktbuf->wire);
+ key = (const char *)&task_msg_id;
+ key_len = sizeof(task_msg_id);
+ } else {
+ key = (const char *)&task;
+ key_len = sizeof(char *);
+ }
+ int ret = trie_del(t, key, key_len, &val);
+ if (ret == kr_ok()) {
+ assert(val == task);
+ worker_task_unref(val);
+ }
+ return ret;
+}
+
+struct qr_task *session_tasklist_get_first(struct session *session)
+{
+ trie_val_t *val = trie_get_first(session->tasks, NULL, NULL);
+ return val ? (struct qr_task *) *val : NULL;
+}
+
+struct qr_task *session_tasklist_del_first(struct session *session, bool deref)
+{
+ trie_val_t val = NULL;
+ int res = trie_del_first(session->tasks, NULL, NULL, &val);
+ if (res != kr_ok()) {
+ val = NULL;
+ } else if (deref) {
+ worker_task_unref(val);
+ }
+ return (struct qr_task *)val;
+}
+struct qr_task* session_tasklist_del_msgid(const struct session *session, uint16_t msg_id)
+{
+ trie_t *t = session->tasks;
+ assert(session->sflags.outgoing);
+ struct qr_task *ret = NULL;
+ const char *key = (const char *)&msg_id;
+ size_t key_len = sizeof(msg_id);
+ trie_val_t val;
+ int res = trie_del(t, key, key_len, &val);
+ if (res == kr_ok()) {
+ if (worker_task_numrefs(val) > 1) {
+ ret = val;
+ }
+ worker_task_unref(val);
+ }
+ return ret;
+}
+
+struct qr_task* session_tasklist_find_msgid(const struct session *session, uint16_t msg_id)
+{
+ trie_t *t = session->tasks;
+ assert(session->sflags.outgoing);
+ struct qr_task *ret = NULL;
+ trie_val_t *val = trie_get_try(t, (char *)&msg_id, sizeof(msg_id));
+ if (val) {
+ ret = *val;
+ }
+ return ret;
+}
+
+struct session_flags *session_flags(struct session *session)
+{
+ return &session->sflags;
+}
+
+struct sockaddr *session_get_peer(struct session *session)
+{
+ return &session->peer.ip;
+}
+
+struct sockaddr *session_get_sockname(struct session *session)
+{
+ return &session->sockname.ip;
+}
+
+struct tls_ctx *session_tls_get_server_ctx(const struct session *session)
+{
+ return session->tls_ctx;
+}
+
+void session_tls_set_server_ctx(struct session *session, struct tls_ctx *ctx)
+{
+ session->tls_ctx = ctx;
+}
+
+struct tls_client_ctx *session_tls_get_client_ctx(const struct session *session)
+{
+ return session->tls_client_ctx;
+}
+
+void session_tls_set_client_ctx(struct session *session, struct tls_client_ctx *ctx)
+{
+ session->tls_client_ctx = ctx;
+}
+
+struct tls_common_ctx *session_tls_get_common_ctx(const struct session *session)
+{
+ struct tls_common_ctx *tls_ctx = session->sflags.outgoing ? &session->tls_client_ctx->c :
+ &session->tls_ctx->c;
+ return tls_ctx;
+}
+
+#if ENABLE_DOH2
+struct http_ctx *session_http_get_server_ctx(const struct session *session)
+{
+ return session->http_ctx;
+}
+
+void session_http_set_server_ctx(struct session *session, struct http_ctx *ctx)
+{
+ session->http_ctx = ctx;
+}
+#endif
+
+uv_handle_t *session_get_handle(struct session *session)
+{
+ return session->handle;
+}
+
+struct session *session_get(uv_handle_t *h)
+{
+ return h->data;
+}
+
+struct session *session_new(uv_handle_t *handle, bool has_tls, bool has_http)
+{
+ if (!handle) {
+ return NULL;
+ }
+ struct session *session = calloc(1, sizeof(struct session));
+ if (!session) {
+ return NULL;
+ }
+
+ queue_init(session->waiting);
+ session->tasks = trie_create(NULL);
+ if (handle->type == UV_TCP) {
+ size_t wire_buffer_size = KNOT_WIRE_MAX_PKTSIZE;
+ if (has_tls) {
+ /* When decoding large packets,
+ * gnutls gives the application chunks of size 16 kb each. */
+ wire_buffer_size += TLS_CHUNK_SIZE;
+ session->sflags.has_tls = true;
+ }
+#if ENABLE_DOH2
+ if (has_http) {
+ /* When decoding large packets,
+ * HTTP/2 frames can be up to 16 KB by default. */
+ wire_buffer_size += HTTP_MAX_FRAME_SIZE;
+ session->sflags.has_http = true;
+ }
+#endif
+ uint8_t *wire_buf = malloc(wire_buffer_size);
+ if (!wire_buf) {
+ free(session);
+ return NULL;
+ }
+ session->wire_buf = wire_buf;
+ session->wire_buf_size = wire_buffer_size;
+ } else if (handle->type == UV_UDP) {
+ /* We use the singleton buffer from worker for all UDP (!)
+ * libuv documentation doesn't really guarantee this is OK,
+ * but the implementation for unix systems does not hold
+ * the buffer (both UDP and TCP) - always makes a NON-blocking
+ * syscall that fills the buffer and immediately calls
+ * the callback, whatever the result of the operation.
+ * We still need to keep in mind to only touch the buffer
+ * in this callback... */
+ assert(handle->loop->data);
+ session->wire_buf = the_worker->wire_buf;
+ session->wire_buf_size = sizeof(the_worker->wire_buf);
+ } else {
+ assert(handle->type == UV_POLL/*XDP*/);
+ /* - wire_buf* are left zeroed, as they make no sense
+ * - timer is unused but OK for simplicity (server-side sessions are few)
+ */
+ }
+
+ uv_timer_init(handle->loop, &session->timeout);
+
+ session->handle = handle;
+ handle->data = session;
+ session->timeout.data = session;
+ session_touch(session);
+
+ return session;
+}
+
+size_t session_tasklist_get_len(const struct session *session)
+{
+ return trie_weight(session->tasks);
+}
+
+size_t session_waitinglist_get_len(const struct session *session)
+{
+ return queue_len(session->waiting);
+}
+
+bool session_tasklist_is_empty(const struct session *session)
+{
+ return session_tasklist_get_len(session) == 0;
+}
+
+bool session_waitinglist_is_empty(const struct session *session)
+{
+ return session_waitinglist_get_len(session) == 0;
+}
+
+bool session_is_empty(const struct session *session)
+{
+ return session_tasklist_is_empty(session) &&
+ session_waitinglist_is_empty(session);
+}
+
+bool session_has_tls(const struct session *session)
+{
+ return session->sflags.has_tls;
+}
+
+void session_set_has_tls(struct session *session, bool has_tls)
+{
+ session->sflags.has_tls = has_tls;
+}
+
+void session_waitinglist_retry(struct session *session, bool increase_timeout_cnt)
+{
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *task = session_waitinglist_pop(session, false);
+ if (increase_timeout_cnt) {
+ worker_task_timeout_inc(task);
+ }
+ worker_task_step(task, &session->peer.ip, NULL);
+ worker_task_unref(task);
+ }
+}
+
+void session_waitinglist_finalize(struct session *session, int status)
+{
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *t = session_waitinglist_pop(session, false);
+ worker_task_finalize(t, status);
+ worker_task_unref(t);
+ }
+}
+
+void session_tasklist_finalize(struct session *session, int status)
+{
+ while (session_tasklist_get_len(session) > 0) {
+ struct qr_task *t = session_tasklist_del_first(session, false);
+ assert(worker_task_numrefs(t) > 0);
+ worker_task_finalize(t, status);
+ worker_task_unref(t);
+ }
+}
+
+int session_tasklist_finalize_expired(struct session *session)
+{
+ int ret = 0;
+ queue_t(struct qr_task *) q;
+ uint64_t now = kr_now();
+ trie_t *t = session->tasks;
+ trie_it_t *it;
+ queue_init(q);
+ for (it = trie_it_begin(t); !trie_it_finished(it); trie_it_next(it)) {
+ trie_val_t *v = trie_it_val(it);
+ struct qr_task *task = (struct qr_task *)*v;
+ if ((now - worker_task_creation_time(task)) >= KR_RESOLVE_TIME_LIMIT) {
+ queue_push(q, task);
+ worker_task_ref(task);
+ }
+ }
+ trie_it_free(it);
+
+ struct qr_task *task = NULL;
+ uint16_t msg_id = 0;
+ char *key = (char *)&task;
+ int32_t keylen = sizeof(struct qr_task *);
+ if (session->sflags.outgoing) {
+ key = (char *)&msg_id;
+ keylen = sizeof(msg_id);
+ }
+ while (queue_len(q) > 0) {
+ task = queue_head(q);
+ if (session->sflags.outgoing) {
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ msg_id = knot_wire_get_id(pktbuf->wire);
+ }
+ int res = trie_del(t, key, keylen, NULL);
+ if (!worker_task_finished(task)) {
+ /* task->pending_count must be zero,
+ * but there are can be followers,
+ * so run worker_task_subreq_finalize() to ensure retrying
+ * for all the followers. */
+ worker_task_subreq_finalize(task);
+ worker_task_finalize(task, KR_STATE_FAIL);
+ }
+ if (res == KNOT_EOK) {
+ worker_task_unref(task);
+ }
+ queue_pop(q);
+ worker_task_unref(task);
+ ++ret;
+ }
+
+ queue_deinit(q);
+ return ret;
+}
+
+int session_timer_start(struct session *session, uv_timer_cb cb,
+ uint64_t timeout, uint64_t repeat)
+{
+ uv_timer_t *timer = &session->timeout;
+ assert(timer->data == session);
+ int ret = uv_timer_start(timer, cb, timeout, repeat);
+ if (ret != 0) {
+ uv_timer_stop(timer);
+ return kr_error(ENOMEM);
+ }
+ return 0;
+}
+
+int session_timer_restart(struct session *session)
+{
+ return uv_timer_again(&session->timeout);
+}
+
+int session_timer_stop(struct session *session)
+{
+ return uv_timer_stop(&session->timeout);
+}
+
+ssize_t session_wirebuf_consume(struct session *session, const uint8_t *data, ssize_t len)
+{
+ if (data != &session->wire_buf[session->wire_buf_end_idx]) {
+ /* shouldn't happen */
+ return kr_error(EINVAL);
+ }
+
+ if (len < 0) {
+ /* shouldn't happen */
+ return kr_error(EINVAL);
+ }
+
+ if (session->wire_buf_end_idx + len > session->wire_buf_size) {
+ /* shouldn't happen */
+ return kr_error(EINVAL);
+ }
+
+ session->wire_buf_end_idx += len;
+ return len;
+}
+
+knot_pkt_t *session_produce_packet(struct session *session, knot_mm_t *mm)
+{
+ session->sflags.wirebuf_error = false;
+ if (session->wire_buf_end_idx == 0) {
+ return NULL;
+ }
+
+ if (session->wire_buf_start_idx == session->wire_buf_end_idx) {
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return NULL;
+ }
+
+ if (session->wire_buf_start_idx > session->wire_buf_end_idx) {
+ session->sflags.wirebuf_error = true;
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return NULL;
+ }
+
+ const uv_handle_t *handle = session->handle;
+ uint8_t *msg_start = &session->wire_buf[session->wire_buf_start_idx];
+ ssize_t wirebuf_msg_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ uint16_t msg_size = 0;
+
+ if (!handle) {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ } else if (handle->type == UV_TCP) {
+ if (wirebuf_msg_data_size < 2) {
+ return NULL;
+ }
+ msg_size = knot_wire_read_u16(msg_start);
+ if (msg_size >= session->wire_buf_size) {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ }
+ if (msg_size + 2 > wirebuf_msg_data_size) {
+ return NULL;
+ }
+ if (msg_size == 0) {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ }
+ msg_start += 2;
+ } else if (wirebuf_msg_data_size < UINT16_MAX) {
+ msg_size = wirebuf_msg_data_size;
+ } else {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ }
+
+
+ knot_pkt_t *pkt = knot_pkt_new(msg_start, msg_size, mm);
+ session->sflags.wirebuf_error = (pkt == NULL);
+ return pkt;
+}
+
+int session_discard_packet(struct session *session, const knot_pkt_t *pkt)
+{
+ uv_handle_t *handle = session->handle;
+ /* Pointer to data start in wire_buf */
+ uint8_t *wirebuf_data_start = &session->wire_buf[session->wire_buf_start_idx];
+ /* Number of data bytes in wire_buf */
+ size_t wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ /* Pointer to message start in wire_buf */
+ uint8_t *wirebuf_msg_start = wirebuf_data_start;
+ /* Number of message bytes in wire_buf.
+ * For UDP it is the same number as wirebuf_data_size. */
+ size_t wirebuf_msg_size = wirebuf_data_size;
+ /* Wire data from parsed packet. */
+ uint8_t *pkt_msg_start = pkt->wire;
+ /* Number of bytes in packet wire buffer. */
+ size_t pkt_msg_size = pkt->size;
+ if (knot_pkt_has_tsig(pkt)) {
+ pkt_msg_size += pkt->tsig_wire.len;
+ }
+
+ session->sflags.wirebuf_error = true;
+
+ if (!handle) {
+ return kr_error(EINVAL);
+ } else if (handle->type == UV_TCP) {
+ /* wire_buf contains TCP DNS message. */
+ if (wirebuf_data_size < 2) {
+ /* TCP message length field isn't in buffer, must not happen. */
+ assert(0);
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+ wirebuf_msg_size = knot_wire_read_u16(wirebuf_msg_start);
+ wirebuf_msg_start += 2;
+ if (wirebuf_msg_size + 2 > wirebuf_data_size) {
+ /* TCP message length field is greater then
+ * number of bytes in buffer, must not happen. */
+ assert(0);
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+ }
+
+ if (wirebuf_msg_start != pkt_msg_start) {
+ /* packet wirebuf must be located at the beginning
+ * of the session wirebuf, must not happen. */
+ assert(0);
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+
+ if (wirebuf_msg_size < pkt_msg_size) {
+ /* Message length field is lesser then packet size,
+ * must not happen. */
+ assert(0);
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+
+ if (handle->type == UV_TCP) {
+ session->wire_buf_start_idx += wirebuf_msg_size + 2;
+ } else {
+ session->wire_buf_start_idx += pkt_msg_size;
+ }
+ session->sflags.wirebuf_error = false;
+
+ wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ if (wirebuf_data_size == 0) {
+ session_wirebuf_discard(session);
+ } else if (wirebuf_data_size < KNOT_WIRE_HEADER_SIZE) {
+ session_wirebuf_compress(session);
+ }
+
+ return kr_ok();
+}
+
+void session_wirebuf_discard(struct session *session)
+{
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+}
+
+void session_wirebuf_compress(struct session *session)
+{
+ if (session->wire_buf_start_idx == 0) {
+ return;
+ }
+ uint8_t *wirebuf_data_start = &session->wire_buf[session->wire_buf_start_idx];
+ size_t wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ if (session->wire_buf_start_idx < wirebuf_data_size) {
+ memmove(session->wire_buf, wirebuf_data_start, wirebuf_data_size);
+ } else {
+ memcpy(session->wire_buf, wirebuf_data_start, wirebuf_data_size);
+ }
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = wirebuf_data_size;
+}
+
+bool session_wirebuf_error(struct session *session)
+{
+ return session->sflags.wirebuf_error;
+}
+
+uint8_t *session_wirebuf_get_start(struct session *session)
+{
+ return session->wire_buf;
+}
+
+size_t session_wirebuf_get_size(struct session *session)
+{
+ return session->wire_buf_size;
+}
+
+uint8_t *session_wirebuf_get_free_start(struct session *session)
+{
+ return &session->wire_buf[session->wire_buf_end_idx];
+}
+
+size_t session_wirebuf_get_free_size(struct session *session)
+{
+ return session->wire_buf_size - session->wire_buf_end_idx;
+}
+
+void session_poison(struct session *session)
+{
+ kr_asan_poison(session, sizeof(*session));
+}
+
+void session_unpoison(struct session *session)
+{
+ kr_asan_unpoison(session, sizeof(*session));
+}
+
+int session_wirebuf_process(struct session *session, const struct sockaddr *peer)
+{
+ int ret = 0;
+ if (session->wire_buf_start_idx == session->wire_buf_end_idx)
+ return ret;
+
+ size_t wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ uint32_t max_iterations = (wirebuf_data_size /
+ (KNOT_WIRE_HEADER_SIZE + KNOT_WIRE_QUESTION_MIN_SIZE)) + 1;
+ knot_pkt_t *pkt = NULL;
+
+ while (((pkt = session_produce_packet(session, &the_worker->pkt_pool)) != NULL) &&
+ (ret < max_iterations)) {
+ assert (!session_wirebuf_error(session));
+ int res = worker_submit(session, peer, NULL, NULL, NULL, pkt);
+ /* Errors from worker_submit() are intetionally *not* handled in order to
+ * ensure the entire wire buffer is processed. */
+ if (res == kr_ok())
+ ret += 1;
+ if (session_discard_packet(session, pkt) < 0) {
+ /* Packet data isn't stored in memory as expected.
+ * something went wrong, normally should not happen. */
+ break;
+ }
+ }
+
+ /* worker_submit() may cause the session to close (e.g. due to IO
+ * write error when the packet triggers an immediate answer). This is
+ * an error state, as well as any wirebuf error. */
+ if (session->sflags.closing || session_wirebuf_error(session))
+ ret = -1;
+
+ return ret;
+}
+
+void session_kill_ioreq(struct session *session, struct qr_task *task)
+{
+ if (!session) {
+ return;
+ }
+ assert(session->sflags.outgoing && session->handle);
+ if (session->sflags.closing) {
+ return;
+ }
+ session_tasklist_del(session, task);
+ if (session->handle->type == UV_UDP) {
+ assert(session_tasklist_is_empty(session));
+ session_close(session);
+ return;
+ }
+}
+
+/** Update timestamp */
+void session_touch(struct session *session)
+{
+ session->last_activity = kr_now();
+}
+
+uint64_t session_last_activity(struct session *session)
+{
+ return session->last_activity;
+}
diff --git a/daemon/session.h b/daemon/session.h
new file mode 100644
index 0000000..7c4bae4
--- /dev/null
+++ b/daemon/session.h
@@ -0,0 +1,147 @@
+/* Copyright (C) 2018-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <libknot/packet/pkt.h>
+
+#include <stdbool.h>
+#include <uv.h>
+
+struct qr_task;
+struct worker_ctx;
+struct session;
+
+struct session_flags {
+ bool outgoing : 1; /**< True: to upstream; false: from a client. */
+ bool throttled : 1; /**< True: data reading from peer is temporarily stopped. */
+ bool has_tls : 1; /**< True: given session uses TLS. */
+ bool has_http : 1; /**< True: given session uses HTTP. */
+ bool connected : 1; /**< True: TCP connection is established. */
+ bool closing : 1; /**< True: session close sequence is in progress. */
+ bool wirebuf_error : 1; /**< True: last operation with wirebuf ended up with an error. */
+};
+
+/** Allocate new session for a libuv handle.
+ * If handle->type isn't UV_TCP, has_* parameters will be ignored. */
+struct session *session_new(uv_handle_t *handle, bool has_tls, bool has_http);
+/** Clear and free given session. */
+void session_free(struct session *session);
+/** Clear session. */
+void session_clear(struct session *session);
+/** Close session. */
+void session_close(struct session *session);
+/** Start reading from underlying libuv IO handle. */
+int session_start_read(struct session *session);
+/** Stop reading from underlying libuv IO handle. */
+int session_stop_read(struct session *session);
+
+/** List of tasks been waiting for IO. */
+/** Check if list is empty. */
+bool session_waitinglist_is_empty(const struct session *session);
+/** Add task to the end of the list. */
+int session_waitinglist_push(struct session *session, struct qr_task *task);
+/** Get the first element. */
+struct qr_task *session_waitinglist_get(const struct session *session);
+/** Get the first element and remove it from the list. */
+struct qr_task *session_waitinglist_pop(struct session *session, bool deref);
+/** Get the list length. */
+size_t session_waitinglist_get_len(const struct session *session);
+/** Retry resolution for each task in the list. */
+void session_waitinglist_retry(struct session *session, bool increase_timeout_cnt);
+/** Finalize all tasks in the list. */
+void session_waitinglist_finalize(struct session *session, int status);
+
+/** List of tasks associated with session. */
+/** Check if list is empty. */
+bool session_tasklist_is_empty(const struct session *session);
+/** Get the first element. */
+struct qr_task *session_tasklist_get_first(struct session *session);
+/** Get the first element and remove it from the list. */
+struct qr_task *session_tasklist_del_first(struct session *session, bool deref);
+/** Get the list length. */
+size_t session_tasklist_get_len(const struct session *session);
+/** Add task to the list. */
+int session_tasklist_add(struct session *session, struct qr_task *task);
+/** Remove task from the list. */
+int session_tasklist_del(struct session *session, struct qr_task *task);
+/** Remove task with given msg_id, session_flags(session)->outgoing must be true. */
+struct qr_task* session_tasklist_del_msgid(const struct session *session, uint16_t msg_id);
+/** Find task with given msg_id */
+struct qr_task* session_tasklist_find_msgid(const struct session *session, uint16_t msg_id);
+/** Finalize all tasks in the list. */
+void session_tasklist_finalize(struct session *session, int status);
+/** Finalize all expired tasks in the list. */
+int session_tasklist_finalize_expired(struct session *session);
+
+/** Both of task lists (associated & waiting). */
+/** Check if empty. */
+bool session_is_empty(const struct session *session);
+/** Get pointer to session flags */
+struct session_flags *session_flags(struct session *session);
+/** Get pointer to peer address. */
+struct sockaddr *session_get_peer(struct session *session);
+/** Get pointer to sockname (address of our end, not meaningful for UDP downstream). */
+struct sockaddr *session_get_sockname(struct session *session);
+/** Get pointer to server-side tls-related data. */
+struct tls_ctx *session_tls_get_server_ctx(const struct session *session);
+/** Set pointer to server-side tls-related data. */
+void session_tls_set_server_ctx(struct session *session, struct tls_ctx *ctx);
+/** Get pointer to client-side tls-related data. */
+struct tls_client_ctx *session_tls_get_client_ctx(const struct session *session);
+/** Set pointer to client-side tls-related data. */
+void session_tls_set_client_ctx(struct session *session, struct tls_client_ctx *ctx);
+/** Get pointer to that part of tls-related data which has common structure for
+ * server and client. */
+struct tls_common_ctx *session_tls_get_common_ctx(const struct session *session);
+
+#if ENABLE_DOH2
+/** Get pointer to server-side http-related data. */
+struct http_ctx *session_http_get_server_ctx(const struct session *session);
+/** Set pointer to server-side http-related data. */
+void session_http_set_server_ctx(struct session *session, struct http_ctx *ctx);
+#endif
+
+/** Get pointer to underlying libuv handle for IO operations. */
+uv_handle_t *session_get_handle(struct session *session);
+struct session *session_get(uv_handle_t *h);
+
+/** Start session timer. */
+int session_timer_start(struct session *session, uv_timer_cb cb,
+ uint64_t timeout, uint64_t repeat);
+/** Restart session timer without changing it parameters. */
+int session_timer_restart(struct session *session);
+/** Stop session timer. */
+int session_timer_stop(struct session *session);
+
+/** Get pointer to the beginning of session wirebuffer. */
+uint8_t *session_wirebuf_get_start(struct session *session);
+/** Get size of session wirebuffer. */
+size_t session_wirebuf_get_size(struct session *session);
+/** Get pointer to the beginning of free space in session wirebuffer. */
+uint8_t *session_wirebuf_get_free_start(struct session *session);
+/** Get amount of free space in session wirebuffer. */
+size_t session_wirebuf_get_free_size(struct session *session);
+/** Discard all data in session wirebuffer. */
+void session_wirebuf_discard(struct session *session);
+/** Move all data to the beginning of the buffer. */
+void session_wirebuf_compress(struct session *session);
+int session_wirebuf_process(struct session *session, const struct sockaddr *peer);
+ssize_t session_wirebuf_consume(struct session *session,
+ const uint8_t *data, ssize_t len);
+
+/** poison session structure with ASAN. */
+void session_poison(struct session *session);
+/** unpoison session structure with ASAN. */
+void session_unpoison(struct session *session);
+
+knot_pkt_t *session_produce_packet(struct session *session, knot_mm_t *mm);
+int session_discard_packet(struct session *session, const knot_pkt_t *pkt);
+
+void session_kill_ioreq(struct session *session, struct qr_task *task);
+/** Update timestamp */
+void session_touch(struct session *session);
+/** Returns either creation time or time of last IO activity if any occurs. */
+/* Used for TCP timeout calculation. */
+uint64_t session_last_activity(struct session *session);
diff --git a/daemon/tls.c b/daemon/tls.c
new file mode 100644
index 0000000..8949283
--- /dev/null
+++ b/daemon/tls.c
@@ -0,0 +1,1192 @@
+/*
+ * Copyright (C) 2016 American Civil Liberties Union (ACLU)
+ * 2016-2018 CZ.NIC, z.s.p.o
+ *
+ * Initial Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+ * Ondřej Surý <ondrej@sury.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <gnutls/abstract.h>
+#include <gnutls/crypto.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+#include <uv.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include "contrib/ucw/lib.h"
+#include "contrib/base64.h"
+#include "daemon/io.h"
+#include "daemon/tls.h"
+#include "daemon/worker.h"
+#include "daemon/session.h"
+
+#define EPHEMERAL_CERT_EXPIRATION_SECONDS_RENEW_BEFORE (60*60*24*7)
+#define GNUTLS_PIN_MIN_VERSION 0x030400
+
+/** @internal Debugging facility. */
+#ifdef DEBUG
+#define DEBUG_MSG(...) kr_log_verbose("[tls] " __VA_ARGS__)
+#else
+#define DEBUG_MSG(...)
+#endif
+
+struct async_write_ctx {
+ uv_write_t write_req;
+ struct tls_common_ctx *t;
+ char buf[];
+};
+
+static char const server_logstring[] = "tls";
+static char const client_logstring[] = "tls_client";
+
+static int client_verify_certificate(gnutls_session_t tls_session);
+
+/**
+ * Set mandatory security settings from
+ * https://tools.ietf.org/html/draft-ietf-dprive-dtls-and-tls-profiles-11#section-9
+ * Performance optimizations are not implemented at the moment.
+ */
+static int kres_gnutls_set_priority(gnutls_session_t session) {
+ static const char * const priorities =
+ "NORMAL:" /* GnuTLS defaults */
+ "-VERS-TLS1.0:-VERS-TLS1.1:" /* TLS 1.2 and higher */
+ /* Some distros by default allow features that are considered
+ * too insecure nowadays, so let's disable them explicitly. */
+ "-VERS-SSL3.0:-ARCFOUR-128:-COMP-ALL:+COMP-NULL";
+ const char *errpos = NULL;
+ int err = gnutls_priority_set_direct(session, priorities, &errpos);
+ if (err != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] setting priority '%s' failed at character %zd (...'%s') with %s (%d)\n",
+ priorities, errpos - priorities, errpos, gnutls_strerror_name(err), err);
+ }
+ return err;
+}
+
+static ssize_t kres_gnutls_pull(gnutls_transport_ptr_t h, void *buf, size_t len)
+{
+ struct tls_common_ctx *t = (struct tls_common_ctx *)h;
+ assert(t != NULL);
+
+ ssize_t avail = t->nread - t->consumed;
+ DEBUG_MSG("[%s] pull wanted: %zu available: %zu\n",
+ t->client_side ? "tls_client" : "tls", len, avail);
+ if (t->nread <= t->consumed) {
+ errno = EAGAIN;
+ return -1;
+ }
+
+ ssize_t transfer = MIN(avail, len);
+ memcpy(buf, t->buf + t->consumed, transfer);
+ t->consumed += transfer;
+ return transfer;
+}
+
+static void on_write_complete(uv_write_t *req, int status)
+{
+ assert(req->data != NULL);
+ struct async_write_ctx *async_ctx = (struct async_write_ctx *)req->data;
+ struct tls_common_ctx *t = async_ctx->t;
+ assert(t->write_queue_size);
+ t->write_queue_size -= 1;
+ free(req->data);
+}
+
+static bool stream_queue_is_empty(struct tls_common_ctx *t)
+{
+ return (t->write_queue_size == 0);
+}
+
+static ssize_t kres_gnutls_vec_push(gnutls_transport_ptr_t h, const giovec_t * iov, int iovcnt)
+{
+ struct tls_common_ctx *t = (struct tls_common_ctx *)h;
+
+ if (t == NULL) {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if (iovcnt == 0) {
+ return 0;
+ }
+
+ assert(t->session);
+ uv_stream_t *handle = (uv_stream_t *)session_get_handle(t->session);
+ assert(handle && handle->type == UV_TCP);
+
+ /*
+ * This is a little bit complicated. There are two different writes:
+ * 1. Immediate, these don't need to own the buffered data and return immediately
+ * 2. Asynchronous, these need to own the buffers until the write completes
+ * In order to avoid copying the buffer, an immediate write is tried first if possible.
+ * If it isn't possible to write the data without queueing, an asynchronous write
+ * is created (with copied buffered data).
+ */
+
+ size_t total_len = 0;
+ uv_buf_t uv_buf[iovcnt];
+ for (int i = 0; i < iovcnt; ++i) {
+ uv_buf[i].base = iov[i].iov_base;
+ uv_buf[i].len = iov[i].iov_len;
+ total_len += iov[i].iov_len;
+ }
+
+ /* Try to perform the immediate write first to avoid copy */
+ int ret = 0;
+ if (stream_queue_is_empty(t)) {
+ ret = uv_try_write(handle, uv_buf, iovcnt);
+ DEBUG_MSG("[%s] push %zu <%p> = %d\n",
+ t->client_side ? "tls_client" : "tls", total_len, h, ret);
+ /* from libuv documentation -
+ uv_try_write will return either:
+ > 0: number of bytes written (can be less than the supplied buffer size).
+ < 0: negative error code (UV_EAGAIN is returned if no data can be sent immediately).
+ */
+ if (ret == total_len) {
+ /* All the data were buffered by libuv.
+ * Return. */
+ return ret;
+ }
+
+ if (ret < 0 && ret != UV_EAGAIN) {
+ /* uv_try_write() has returned error code other then UV_EAGAIN.
+ * Return. */
+ kr_log_verbose("[%s] uv_try_write error: %s\n",
+ t->client_side ? "tls_client" : "tls", uv_strerror(ret));
+ ret = -1;
+ errno = EIO;
+ return ret;
+ }
+ /* Since we are here expression below is true
+ * (ret != total_len) && (ret >= 0 || ret == UV_EAGAIN)
+ * or the same
+ * (ret != total_len && ret >= 0) || (ret != total_len && ret == UV_EAGAIN)
+ * i.e. either occurs partial write or UV_EAGAIN.
+ * Proceed and copy data amount to owned memory and perform async write.
+ */
+ if (ret == UV_EAGAIN) {
+ /* No data were buffered, so we must buffer all the data. */
+ ret = 0;
+ }
+ }
+
+ /* Fallback when the queue is full, and it's not possible to do an immediate write */
+ char *p = malloc(sizeof(struct async_write_ctx) + total_len - ret);
+ if (p != NULL) {
+ struct async_write_ctx *async_ctx = (struct async_write_ctx *)p;
+ /* Save pointer to session tls context */
+ async_ctx->t = t;
+ char *buf = async_ctx->buf;
+ /* Skip data written in the partial write */
+ size_t to_skip = ret;
+ /* Copy the buffer into owned memory */
+ size_t off = 0;
+ for (int i = 0; i < iovcnt; ++i) {
+ if (to_skip > 0) {
+ /* Ignore current buffer if it's all skipped */
+ if (to_skip >= uv_buf[i].len) {
+ to_skip -= uv_buf[i].len;
+ continue;
+ }
+ /* Skip only part of the buffer */
+ uv_buf[i].base += to_skip;
+ uv_buf[i].len -= to_skip;
+ to_skip = 0;
+ }
+ memcpy(buf + off, uv_buf[i].base, uv_buf[i].len);
+ off += uv_buf[i].len;
+ }
+ uv_buf[0].base = buf;
+ uv_buf[0].len = off;
+
+ /* Create an asynchronous write request */
+ uv_write_t *write_req = &async_ctx->write_req;
+ memset(write_req, 0, sizeof(uv_write_t));
+ write_req->data = p;
+
+ /* Perform an asynchronous write with a callback */
+ if (uv_write(write_req, handle, uv_buf, 1, on_write_complete) == 0) {
+ ret = total_len;
+ t->write_queue_size += 1;
+ } else {
+ free(p);
+ kr_log_verbose("[%s] uv_write error: %s\n",
+ t->client_side ? "tls_client" : "tls", uv_strerror(ret));
+ errno = EIO;
+ ret = -1;
+ }
+ } else {
+ errno = ENOMEM;
+ ret = -1;
+ }
+
+ DEBUG_MSG("[%s] queued %zu <%p> = %d\n",
+ t->client_side ? "tls_client" : "tls", total_len, h, ret);
+
+ return ret;
+}
+
+/** Perform TLS handshake and handle error codes according to the documentation.
+ * See See https://gnutls.org/manual/html_node/TLS-handshake.html#TLS-handshake
+ * The function returns kr_ok() or success or non fatal error, kr_error(EAGAIN) on blocking, or kr_error(EIO) on fatal error.
+ */
+static int tls_handshake(struct tls_common_ctx *ctx, tls_handshake_cb handshake_cb) {
+ struct session *session = ctx->session;
+ const char *logstring = ctx->client_side ? client_logstring : server_logstring;
+
+ int err = gnutls_handshake(ctx->tls_session);
+ if (err == GNUTLS_E_SUCCESS) {
+ /* Handshake finished, return success */
+ ctx->handshake_state = TLS_HS_DONE;
+ struct sockaddr *peer = session_get_peer(session);
+ kr_log_verbose("[%s] TLS handshake with %s has completed\n",
+ logstring, kr_straddr(peer));
+ if (handshake_cb) {
+ if (handshake_cb(session, 0) != kr_ok()) {
+ return kr_error(EIO);
+ }
+ }
+ } else if (err == GNUTLS_E_AGAIN) {
+ return kr_error(EAGAIN);
+ } else if (gnutls_error_is_fatal(err)) {
+ /* Fatal errors, return error as it's not recoverable */
+ kr_log_verbose("[%s] gnutls_handshake failed: %s (%d)\n",
+ logstring,
+ gnutls_strerror_name(err), err);
+ /* Notify the peer about handshake failure via an alert. */
+ gnutls_alert_send_appropriate(ctx->tls_session, err);
+ if (handshake_cb) {
+ handshake_cb(session, -1);
+ }
+ return kr_error(EIO);
+ } else if (err == GNUTLS_E_WARNING_ALERT_RECEIVED) {
+ /* Handle warning when in verbose mode */
+ const char *alert_name = gnutls_alert_get_name(gnutls_alert_get(ctx->tls_session));
+ if (alert_name != NULL) {
+ struct sockaddr *peer = session_get_peer(session);
+ kr_log_verbose("[%s] TLS alert from %s received: %s\n",
+ logstring, kr_straddr(peer), alert_name);
+ }
+ }
+ return kr_ok();
+}
+
+
+struct tls_ctx *tls_new(struct worker_ctx *worker)
+{
+ assert(worker != NULL);
+ assert(worker->engine != NULL);
+
+ struct network *net = &worker->engine->net;
+ if (!net->tls_credentials) {
+ net->tls_credentials = tls_get_ephemeral_credentials(worker->engine);
+ if (!net->tls_credentials) {
+ kr_log_error("[tls] X.509 credentials are missing, and ephemeral credentials failed; no TLS\n");
+ return NULL;
+ }
+ kr_log_info("[tls] Using ephemeral TLS credentials\n");
+ tls_credentials_log_pins(net->tls_credentials);
+ }
+
+ time_t now = time(NULL);
+ if (net->tls_credentials->valid_until != GNUTLS_X509_NO_WELL_DEFINED_EXPIRATION) {
+ if (net->tls_credentials->ephemeral_servicename) {
+ /* ephemeral cert: refresh if due to expire within a week */
+ if (now >= net->tls_credentials->valid_until - EPHEMERAL_CERT_EXPIRATION_SECONDS_RENEW_BEFORE) {
+ struct tls_credentials *newcreds = tls_get_ephemeral_credentials(worker->engine);
+ if (newcreds) {
+ tls_credentials_release(net->tls_credentials);
+ net->tls_credentials = newcreds;
+ kr_log_info("[tls] Renewed expiring ephemeral X.509 cert\n");
+ } else {
+ kr_log_error("[tls] Failed to renew expiring ephemeral X.509 cert, using existing one\n");
+ }
+ }
+ } else {
+ /* non-ephemeral cert: warn once when certificate expires */
+ if (now >= net->tls_credentials->valid_until) {
+ kr_log_error("[tls] X.509 certificate has expired!\n");
+ net->tls_credentials->valid_until = GNUTLS_X509_NO_WELL_DEFINED_EXPIRATION;
+ }
+ }
+ }
+
+ struct tls_ctx *tls = calloc(1, sizeof(struct tls_ctx));
+ if (tls == NULL) {
+ kr_log_error("[tls] failed to allocate TLS context\n");
+ return NULL;
+ }
+
+ int err = gnutls_init(&tls->c.tls_session, GNUTLS_SERVER | GNUTLS_NONBLOCK);
+ if (err != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] gnutls_init(): %s (%d)\n", gnutls_strerror_name(err), err);
+ tls_free(tls);
+ return NULL;
+ }
+ tls->credentials = tls_credentials_reserve(net->tls_credentials);
+ err = gnutls_credentials_set(tls->c.tls_session, GNUTLS_CRD_CERTIFICATE,
+ tls->credentials->credentials);
+ if (err != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] gnutls_credentials_set(): %s (%d)\n", gnutls_strerror_name(err), err);
+ tls_free(tls);
+ return NULL;
+ }
+ if (kres_gnutls_set_priority(tls->c.tls_session) != GNUTLS_E_SUCCESS) {
+ tls_free(tls);
+ return NULL;
+ }
+
+ tls->c.worker = worker;
+ tls->c.client_side = false;
+
+ gnutls_transport_set_pull_function(tls->c.tls_session, kres_gnutls_pull);
+ gnutls_transport_set_vec_push_function(tls->c.tls_session, kres_gnutls_vec_push);
+ gnutls_transport_set_ptr(tls->c.tls_session, tls);
+
+ if (net->tls_session_ticket_ctx) {
+ tls_session_ticket_enable(net->tls_session_ticket_ctx,
+ tls->c.tls_session);
+ }
+
+ return tls;
+}
+
+void tls_close(struct tls_common_ctx *ctx)
+{
+ if (ctx == NULL || ctx->tls_session == NULL) {
+ return;
+ }
+
+ assert(ctx->session);
+
+ if (ctx->handshake_state == TLS_HS_DONE) {
+ const struct sockaddr *peer = session_get_peer(ctx->session);
+ kr_log_verbose("[%s] closing tls connection to `%s`\n",
+ ctx->client_side ? "tls_client" : "tls",
+ kr_straddr(peer));
+ ctx->handshake_state = TLS_HS_CLOSING;
+ gnutls_bye(ctx->tls_session, GNUTLS_SHUT_RDWR);
+ }
+}
+
+void tls_free(struct tls_ctx *tls)
+{
+ if (!tls) {
+ return;
+ }
+
+ if (tls->c.tls_session) {
+ /* Don't terminate TLS connection, just tear it down */
+ gnutls_deinit(tls->c.tls_session);
+ tls->c.tls_session = NULL;
+ }
+
+ tls_credentials_release(tls->credentials);
+ free(tls);
+}
+
+int tls_write(uv_write_t *req, uv_handle_t *handle, knot_pkt_t *pkt, uv_write_cb cb)
+{
+ if (!pkt || !handle || !handle->data) {
+ return kr_error(EINVAL);
+ }
+
+ struct session *s = handle->data;
+ struct tls_common_ctx *tls_ctx = session_tls_get_common_ctx(s);
+
+ assert (tls_ctx);
+ assert (session_flags(s)->outgoing == tls_ctx->client_side);
+
+ const uint16_t pkt_size = htons(pkt->size);
+ const char *logstring = tls_ctx->client_side ? client_logstring : server_logstring;
+ gnutls_session_t tls_session = tls_ctx->tls_session;
+
+ gnutls_record_cork(tls_session);
+ ssize_t count = 0;
+ if ((count = gnutls_record_send(tls_session, &pkt_size, sizeof(pkt_size)) < 0) ||
+ (count = gnutls_record_send(tls_session, pkt->wire, pkt->size) < 0)) {
+ kr_log_verbose("[%s] gnutls_record_send failed: %s (%zd)\n",
+ logstring, gnutls_strerror_name(count), count);
+ return kr_error(EIO);
+ }
+
+ const ssize_t submitted = sizeof(pkt_size) + pkt->size;
+
+ int ret = gnutls_record_uncork(tls_session, GNUTLS_RECORD_WAIT);
+ if (ret < 0) {
+ if (!gnutls_error_is_fatal(ret)) {
+ return kr_error(EAGAIN);
+ } else {
+ kr_log_verbose("[%s] gnutls_record_uncork failed: %s (%d)\n",
+ logstring, gnutls_strerror_name(ret), ret);
+ return kr_error(EIO);
+ }
+ }
+
+ if (ret != submitted) {
+ kr_log_error("[%s] gnutls_record_uncork didn't send all data (%d of %zd)\n",
+ logstring, ret, submitted);
+ return kr_error(EIO);
+ }
+
+ /* The data is now accepted in gnutls internal buffers, the message can be treated as sent */
+ req->handle = (uv_stream_t *)handle;
+ cb(req, 0);
+
+ return kr_ok();
+}
+
+ssize_t tls_process_input_data(struct session *s, const uint8_t *buf, ssize_t nread)
+{
+ struct tls_common_ctx *tls_p = session_tls_get_common_ctx(s);
+ if (!tls_p) {
+ return kr_error(ENOSYS);
+ }
+
+ assert(tls_p->session == s);
+ const bool ok = tls_p->recv_buf == buf && nread <= sizeof(tls_p->recv_buf);
+ if (!ok) {
+ assert(false);
+ /* don't risk overflowing the buffer if we have a mistake somewhere */
+ return kr_error(EINVAL);
+ }
+
+ const char *logstring = tls_p->client_side ? client_logstring : server_logstring;
+
+ tls_p->buf = buf;
+ tls_p->nread = nread >= 0 ? nread : 0;
+ tls_p->consumed = 0;
+
+ /* Ensure TLS handshake is performed before receiving data.
+ * See https://www.gnutls.org/manual/html_node/TLS-handshake.html */
+ while (tls_p->handshake_state <= TLS_HS_IN_PROGRESS) {
+ int err = tls_handshake(tls_p, tls_p->handshake_cb);
+ if (err == kr_error(EAGAIN)) {
+ return 0; /* Wait for more data */
+ } else if (err != kr_ok()) {
+ return err;
+ }
+ }
+
+ /* See https://gnutls.org/manual/html_node/Data-transfer-and-termination.html#Data-transfer-and-termination */
+ ssize_t submitted = 0;
+ uint8_t *wire_buf = session_wirebuf_get_free_start(s);
+ size_t wire_buf_size = session_wirebuf_get_free_size(s);
+ while (true) {
+ ssize_t count = gnutls_record_recv(tls_p->tls_session, wire_buf, wire_buf_size);
+ if (count == GNUTLS_E_AGAIN) {
+ if (tls_p->consumed == tls_p->nread) {
+ /* See https://www.gnutls.org/manual/html_node/Asynchronous-operation.html */
+ break; /* No more data available in this libuv buffer */
+ }
+ continue;
+ } else if (count == GNUTLS_E_INTERRUPTED) {
+ continue;
+ } else if (count == GNUTLS_E_REHANDSHAKE) {
+ /* See https://www.gnutls.org/manual/html_node/Re_002dauthentication.html */
+ struct sockaddr *peer = session_get_peer(s);
+ kr_log_verbose("[%s] TLS rehandshake with %s has started\n",
+ logstring, kr_straddr(peer));
+ tls_set_hs_state(tls_p, TLS_HS_IN_PROGRESS);
+ int err = kr_ok();
+ while (tls_p->handshake_state <= TLS_HS_IN_PROGRESS) {
+ err = tls_handshake(tls_p, tls_p->handshake_cb);
+ if (err == kr_error(EAGAIN)) {
+ break;
+ } else if (err != kr_ok()) {
+ return err;
+ }
+ }
+ if (err == kr_error(EAGAIN)) {
+ /* pull function is out of data */
+ break;
+ }
+ /* There are can be data available, check it. */
+ continue;
+ } else if (count < 0) {
+ kr_log_verbose("[%s] gnutls_record_recv failed: %s (%zd)\n",
+ logstring, gnutls_strerror_name(count), count);
+ return kr_error(EIO);
+ } else if (count == 0) {
+ break;
+ }
+ DEBUG_MSG("[%s] received %zd data\n", logstring, count);
+ wire_buf += count;
+ wire_buf_size -= count;
+ submitted += count;
+ if (wire_buf_size == 0 && tls_p->consumed != tls_p->nread) {
+ /* session buffer is full
+ * whereas not all the data were consumed */
+ return kr_error(ENOSPC);
+ }
+ }
+ /* Here all data must be consumed. */
+ if (tls_p->consumed != tls_p->nread) {
+ /* Something went wrong, better return error.
+ * This is most probably due to gnutls_record_recv() did not
+ * consume all available network data by calling kres_gnutls_pull().
+ * TODO assess the need for buffering of data amount.
+ */
+ return kr_error(ENOSPC);
+ }
+ return submitted;
+}
+
+#if TLS_CAN_USE_PINS
+/*
+ DNS-over-TLS Out of band key-pinned authentication profile uses the
+ same form of pins as HPKP:
+
+ e.g. pin-sha256="FHkyLhvI0n70E47cJlRTamTrnYVcsYdjUGbr79CfAVI="
+
+ DNS-over-TLS OOB key-pins: https://tools.ietf.org/html/rfc7858#appendix-A
+ HPKP pin reference: https://tools.ietf.org/html/rfc7469#appendix-A
+*/
+#define PINLEN ((((32) * 8 + 4)/6) + 3 + 1)
+
+/* Compute pin_sha256 for the certificate.
+ * It may be in raw format - just TLS_SHA256_RAW_LEN bytes without termination,
+ * or it may be a base64 0-terminated string requiring up to
+ * TLS_SHA256_BASE64_BUFLEN bytes.
+ * \return error code */
+static int get_oob_key_pin(gnutls_x509_crt_t crt, char *outchar, ssize_t outchar_len, bool raw)
+{
+ if (raw && outchar_len < TLS_SHA256_RAW_LEN) {
+ assert(false);
+ return kr_error(ENOSPC);
+ /* With !raw we have check inside kr_base64_encode. */
+ }
+ gnutls_pubkey_t key;
+ int err = gnutls_pubkey_init(&key);
+ if (err != GNUTLS_E_SUCCESS) return err;
+
+ gnutls_datum_t datum = { .data = NULL, .size = 0 };
+ err = gnutls_pubkey_import_x509(key, crt, 0);
+ if (err != GNUTLS_E_SUCCESS) goto leave;
+
+ err = gnutls_pubkey_export2(key, GNUTLS_X509_FMT_DER, &datum);
+ if (err != GNUTLS_E_SUCCESS) goto leave;
+
+ char raw_pin[TLS_SHA256_RAW_LEN]; /* TMP buffer if raw == false */
+ err = gnutls_hash_fast(GNUTLS_DIG_SHA256, datum.data, datum.size,
+ (raw ? outchar : raw_pin));
+ if (err != GNUTLS_E_SUCCESS || raw/*success*/)
+ goto leave;
+ /* Convert to non-raw. */
+ err = kr_base64_encode((uint8_t *)raw_pin, sizeof(raw_pin),
+ (uint8_t *)outchar, outchar_len);
+ if (err >= 0 && err < outchar_len) {
+ err = GNUTLS_E_SUCCESS;
+ outchar[err] = '\0'; /* kr_base64_encode() doesn't do it */
+ } else if (err >= 0) {
+ assert(false);
+ err = kr_error(ENOSPC); /* base64 fits but '\0' doesn't */
+ outchar[outchar_len - 1] = '\0';
+ }
+leave:
+ gnutls_free(datum.data);
+ gnutls_pubkey_deinit(key);
+ return err;
+}
+
+void tls_credentials_log_pins(struct tls_credentials *tls_credentials)
+{
+ for (int index = 0;; index++) {
+ gnutls_x509_crt_t *certs = NULL;
+ unsigned int cert_count = 0;
+ int err = gnutls_certificate_get_x509_crt(tls_credentials->credentials,
+ index, &certs, &cert_count);
+ if (err != GNUTLS_E_SUCCESS) {
+ if (err != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
+ kr_log_error("[tls] could not get X.509 certificates (%d) %s\n",
+ err, gnutls_strerror_name(err));
+ }
+ return;
+ }
+
+ for (int i = 0; i < cert_count; i++) {
+ char pin[TLS_SHA256_BASE64_BUFLEN] = { 0 };
+ err = get_oob_key_pin(certs[i], pin, sizeof(pin), false);
+ if (err != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] could not calculate RFC 7858 OOB key-pin from cert %d (%d) %s\n",
+ i, err, gnutls_strerror_name(err));
+ } else {
+ kr_log_info("[tls] RFC 7858 OOB key-pin (%d): pin-sha256=\"%s\"\n",
+ i, pin);
+ }
+ gnutls_x509_crt_deinit(certs[i]);
+ }
+ gnutls_free(certs);
+ }
+}
+#else
+void tls_credentials_log_pins(struct tls_credentials *tls_credentials)
+{
+ kr_log_verbose("[tls] could not calculate RFC 7858 OOB key-pin; GnuTLS 3.4.0+ required\n");
+}
+#endif
+
+static int str_replace(char **where_ptr, const char *with)
+{
+ char *copy = with ? strdup(with) : NULL;
+ if (with && !copy) {
+ return kr_error(ENOMEM);
+ }
+
+ free(*where_ptr);
+ *where_ptr = copy;
+ return kr_ok();
+}
+
+static time_t _get_end_entity_expiration(gnutls_certificate_credentials_t creds)
+{
+ gnutls_datum_t data;
+ gnutls_x509_crt_t cert = NULL;
+ int err;
+ time_t ret = GNUTLS_X509_NO_WELL_DEFINED_EXPIRATION;
+
+ if ((err = gnutls_certificate_get_crt_raw(creds, 0, 0, &data)) != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] failed to get cert to check expiration: (%d) %s\n",
+ err, gnutls_strerror_name(err));
+ goto done;
+ }
+ if ((err = gnutls_x509_crt_init(&cert)) != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] failed to initialize cert: (%d) %s\n",
+ err, gnutls_strerror_name(err));
+ goto done;
+ }
+ if ((err = gnutls_x509_crt_import(cert, &data, GNUTLS_X509_FMT_DER)) != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] failed to construct cert while checking expiration: (%d) %s\n",
+ err, gnutls_strerror_name(err));
+ goto done;
+ }
+
+ ret = gnutls_x509_crt_get_expiration_time (cert);
+ done:
+ /* do not free data; g_c_get_crt_raw() says to treat it as
+ * constant. */
+ gnutls_x509_crt_deinit(cert);
+ return ret;
+}
+
+int tls_certificate_set(struct network *net, const char *tls_cert, const char *tls_key)
+{
+ if (!net) {
+ return kr_error(EINVAL);
+ }
+
+ struct tls_credentials *tls_credentials = calloc(1, sizeof(*tls_credentials));
+ if (tls_credentials == NULL) {
+ return kr_error(ENOMEM);
+ }
+
+ int err = 0;
+ if ((err = gnutls_certificate_allocate_credentials(&tls_credentials->credentials)) != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls] gnutls_certificate_allocate_credentials() failed: (%d) %s\n",
+ err, gnutls_strerror_name(err));
+ tls_credentials_free(tls_credentials);
+ return kr_error(ENOMEM);
+ }
+ if ((err = gnutls_certificate_set_x509_system_trust(tls_credentials->credentials)) < 0) {
+ if (err != GNUTLS_E_UNIMPLEMENTED_FEATURE) {
+ kr_log_error("[tls] warning: gnutls_certificate_set_x509_system_trust() failed: (%d) %s\n",
+ err, gnutls_strerror_name(err));
+ tls_credentials_free(tls_credentials);
+ return err;
+ }
+ }
+
+ if ((str_replace(&tls_credentials->tls_cert, tls_cert) != 0) ||
+ (str_replace(&tls_credentials->tls_key, tls_key) != 0)) {
+ tls_credentials_free(tls_credentials);
+ return kr_error(ENOMEM);
+ }
+
+ if ((err = gnutls_certificate_set_x509_key_file(tls_credentials->credentials,
+ tls_cert, tls_key, GNUTLS_X509_FMT_PEM)) != GNUTLS_E_SUCCESS) {
+ tls_credentials_free(tls_credentials);
+ kr_log_error("[tls] gnutls_certificate_set_x509_key_file(%s,%s) failed: %d (%s)\n",
+ tls_cert, tls_key, err, gnutls_strerror_name(err));
+ return kr_error(EINVAL);
+ }
+ /* record the expiration date: */
+ tls_credentials->valid_until = _get_end_entity_expiration(tls_credentials->credentials);
+
+ /* Exchange the x509 credentials */
+ struct tls_credentials *old_credentials = net->tls_credentials;
+
+ /* Start using the new x509_credentials */
+ net->tls_credentials = tls_credentials;
+ tls_credentials_log_pins(net->tls_credentials);
+
+ if (old_credentials) {
+ err = tls_credentials_release(old_credentials);
+ if (err != kr_error(EBUSY)) {
+ return err;
+ }
+ }
+
+ return kr_ok();
+}
+
+struct tls_credentials *tls_credentials_reserve(struct tls_credentials *tls_credentials) {
+ if (!tls_credentials) {
+ return NULL;
+ }
+ tls_credentials->count++;
+ return tls_credentials;
+}
+
+int tls_credentials_release(struct tls_credentials *tls_credentials) {
+ if (!tls_credentials) {
+ return kr_error(EINVAL);
+ }
+ if (--tls_credentials->count < 0) {
+ tls_credentials_free(tls_credentials);
+ } else {
+ return kr_error(EBUSY);
+ }
+ return kr_ok();
+}
+
+void tls_credentials_free(struct tls_credentials *tls_credentials) {
+ if (!tls_credentials) {
+ return;
+ }
+
+ if (tls_credentials->credentials) {
+ gnutls_certificate_free_credentials(tls_credentials->credentials);
+ }
+ if (tls_credentials->tls_cert) {
+ free(tls_credentials->tls_cert);
+ }
+ if (tls_credentials->tls_key) {
+ free(tls_credentials->tls_key);
+ }
+ if (tls_credentials->ephemeral_servicename) {
+ free(tls_credentials->ephemeral_servicename);
+ }
+ free(tls_credentials);
+}
+
+void tls_client_param_unref(tls_client_param_t *entry)
+{
+ if (!entry) return;
+ assert(entry->refs); /* Well, we'd only leak memory. */
+ --(entry->refs);
+ if (entry->refs) return;
+
+ DEBUG_MSG("freeing TLS parameters %p\n", (void *)entry);
+
+ for (int i = 0; i < entry->ca_files.len; ++i) {
+ free_const(entry->ca_files.at[i]);
+ }
+ array_clear(entry->ca_files);
+
+ free_const(entry->hostname);
+
+ for (int i = 0; i < entry->pins.len; ++i) {
+ free_const(entry->pins.at[i]);
+ }
+ array_clear(entry->pins);
+
+ if (entry->credentials) {
+ gnutls_certificate_free_credentials(entry->credentials);
+ }
+
+ if (entry->session_data.data) {
+ gnutls_free(entry->session_data.data);
+ }
+
+ free(entry);
+}
+static int param_free(void **param, void *null)
+{
+ assert(param && *param);
+ tls_client_param_unref(*param);
+ return 0;
+}
+void tls_client_params_free(tls_client_params_t *params)
+{
+ if (!params) return;
+ trie_apply(params, param_free, NULL);
+ trie_free(params);
+}
+
+tls_client_param_t * tls_client_param_new()
+{
+ tls_client_param_t *e = calloc(1, sizeof(*e));
+ if (!e) {
+ assert(!ENOMEM);
+ return NULL;
+ }
+ /* Note: those array_t don't need further initialization. */
+ e->refs = 1;
+ int ret = gnutls_certificate_allocate_credentials(&e->credentials);
+ if (ret != GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls_client] error: gnutls_certificate_allocate_credentials() fails (%s)\n",
+ gnutls_strerror_name(ret));
+ free(e);
+ return NULL;
+ }
+ gnutls_certificate_set_verify_function(e->credentials, client_verify_certificate);
+ return e;
+}
+
+/**
+ * Convert an IP address and port number to binary key.
+ *
+ * \precond buffer \param key must have sufficient size
+ * \param addr[in]
+ * \param len[out] output length
+ * \param key[out] output buffer
+ */
+static bool construct_key(const union inaddr *addr, uint32_t *len, char *key)
+{
+ switch (addr->ip.sa_family) {
+ case AF_INET:
+ memcpy(key, &addr->ip4.sin_port, sizeof(addr->ip4.sin_port));
+ memcpy(key + sizeof(addr->ip4.sin_port), &addr->ip4.sin_addr,
+ sizeof(addr->ip4.sin_addr));
+ *len = sizeof(addr->ip4.sin_port) + sizeof(addr->ip4.sin_addr);
+ return true;
+ case AF_INET6:
+ memcpy(key, &addr->ip6.sin6_port, sizeof(addr->ip6.sin6_port));
+ memcpy(key + sizeof(addr->ip6.sin6_port), &addr->ip6.sin6_addr,
+ sizeof(addr->ip6.sin6_addr));
+ *len = sizeof(addr->ip6.sin6_port) + sizeof(addr->ip6.sin6_addr);
+ return true;
+ default:
+ assert(!EINVAL);
+ return false;
+ }
+}
+tls_client_param_t ** tls_client_param_getptr(tls_client_params_t **params,
+ const struct sockaddr *addr, bool do_insert)
+{
+ assert(params && addr);
+ /* We accept NULL for empty map; ensure the map exists if needed. */
+ if (!*params) {
+ if (!do_insert) return NULL;
+ *params = trie_create(NULL);
+ if (!*params) {
+ assert(!ENOMEM);
+ return NULL;
+ }
+ }
+ /* Construct the key. */
+ const union inaddr *ia = (const union inaddr *)addr;
+ char key[sizeof(ia->ip6.sin6_port) + sizeof(ia->ip6.sin6_addr)];
+ uint32_t len;
+ if (!construct_key(ia, &len, key))
+ return NULL;
+ /* Get the entry. */
+ return (tls_client_param_t **)
+ (do_insert ? trie_get_ins : trie_get_try)(*params, key, len);
+}
+
+int tls_client_param_remove(tls_client_params_t *params, const struct sockaddr *addr)
+{
+ const union inaddr *ia = (const union inaddr *)addr;
+ char key[sizeof(ia->ip6.sin6_port) + sizeof(ia->ip6.sin6_addr)];
+ uint32_t len;
+ if (!construct_key(ia, &len, key))
+ return kr_error(EINVAL);
+ trie_val_t param_ptr;
+ int ret = trie_del(params, key, len, &param_ptr);
+ if (ret)
+ return kr_error(ret);
+ tls_client_param_unref(param_ptr);
+ return kr_ok();
+}
+
+/**
+ * Verify that at least one certificate in the certificate chain matches
+ * at least one certificate pin in the non-empty params->pins array.
+ * \returns GNUTLS_E_SUCCESS if pin matches, any other value is an error
+ */
+static int client_verify_pin(const unsigned int cert_list_size,
+ const gnutls_datum_t *cert_list,
+ tls_client_param_t *params)
+{
+ assert(params->pins.len > 0);
+#if TLS_CAN_USE_PINS
+ for (int i = 0; i < cert_list_size; i++) {
+ gnutls_x509_crt_t cert;
+ int ret = gnutls_x509_crt_init(&cert);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return ret;
+ }
+
+ ret = gnutls_x509_crt_import(cert, &cert_list[i], GNUTLS_X509_FMT_DER);
+ if (ret != GNUTLS_E_SUCCESS) {
+ gnutls_x509_crt_deinit(cert);
+ return ret;
+ }
+
+ #ifdef DEBUG
+ if (VERBOSE_STATUS) {
+ char pin_base64[TLS_SHA256_BASE64_BUFLEN];
+ /* DEBUG: additionally compute and print the base64 pin.
+ * Not very efficient, but that's OK for DEBUG. */
+ ret = get_oob_key_pin(cert, pin_base64, sizeof(pin_base64), false);
+ if (ret == GNUTLS_E_SUCCESS) {
+ DEBUG_MSG("[tls_client] received pin: %s\n", pin_base64);
+ } else {
+ DEBUG_MSG("[tls_client] failed to convert received pin\n");
+ /* Now we hope that `ret` below can't differ. */
+ }
+ }
+ #endif
+ char cert_pin[TLS_SHA256_RAW_LEN];
+ /* Get raw pin and compare. */
+ ret = get_oob_key_pin(cert, cert_pin, sizeof(cert_pin), true);
+ gnutls_x509_crt_deinit(cert);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return ret;
+ }
+ for (size_t j = 0; j < params->pins.len; ++j) {
+ const uint8_t *pin = params->pins.at[j];
+ if (memcmp(cert_pin, pin, TLS_SHA256_RAW_LEN) != 0)
+ continue; /* mismatch */
+ DEBUG_MSG("[tls_client] matched a configured pin no. %zd\n", j);
+ return GNUTLS_E_SUCCESS;
+ }
+ DEBUG_MSG("[tls_client] none of %zd configured pin(s) matched\n",
+ params->pins.len);
+ }
+
+ kr_log_error("[tls_client] no pin matched: %zu pins * %d certificates\n",
+ params->pins.len, cert_list_size);
+ return GNUTLS_E_CERTIFICATE_ERROR;
+
+#else /* TLS_CAN_USE_PINS */
+ kr_log_error("[tls_client] internal inconsistency: TLS_CAN_USE_PINS\n");
+ assert(false);
+ return GNUTLS_E_CERTIFICATE_ERROR;
+#endif
+}
+
+/**
+ * Verify that \param tls_session contains a valid X.509 certificate chain
+ * with given hostname.
+ *
+ * \returns GNUTLS_E_SUCCESS if certificate chain is valid, any other value is an error
+ */
+static int client_verify_certchain(gnutls_session_t tls_session, const char *hostname)
+{
+ if (!hostname) {
+ kr_log_error("[tls_client] internal config inconsistency: no hostname set\n");
+ assert(false);
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ unsigned int status;
+ int ret = gnutls_certificate_verify_peers3(tls_session, hostname, &status);
+ if ((ret == GNUTLS_E_SUCCESS) && (status == 0)) {
+ return GNUTLS_E_SUCCESS;
+ }
+
+ if (ret == GNUTLS_E_SUCCESS) {
+ gnutls_datum_t msg;
+ ret = gnutls_certificate_verification_status_print(
+ status, gnutls_certificate_type_get(tls_session), &msg, 0);
+ if (ret == GNUTLS_E_SUCCESS) {
+ kr_log_error("[tls_client] failed to verify peer certificate: "
+ "%s\n", msg.data);
+ gnutls_free(msg.data);
+ } else {
+ kr_log_error("[tls_client] failed to verify peer certificate: "
+ "unable to print reason: %s (%s)\n",
+ gnutls_strerror(ret), gnutls_strerror_name(ret));
+ } /* gnutls_certificate_verification_status_print end */
+ } else {
+ kr_log_error("[tls_client] failed to verify peer certificate: "
+ "gnutls_certificate_verify_peers3 error: %s (%s)\n",
+ gnutls_strerror(ret), gnutls_strerror_name(ret));
+ } /* gnutls_certificate_verify_peers3 end */
+ return GNUTLS_E_CERTIFICATE_ERROR;
+}
+
+/**
+ * Verify that actual TLS security parameters of \param tls_session
+ * match requirements provided by user in tls_session->params.
+ * \returns GNUTLS_E_SUCCESS if requirements were met, any other value is an error
+ */
+static int client_verify_certificate(gnutls_session_t tls_session)
+{
+ struct tls_client_ctx *ctx = gnutls_session_get_ptr(tls_session);
+ assert(ctx->params != NULL);
+
+ if (ctx->params->insecure) {
+ return GNUTLS_E_SUCCESS;
+ }
+
+ gnutls_certificate_type_t cert_type = gnutls_certificate_type_get(tls_session);
+ if (cert_type != GNUTLS_CRT_X509) {
+ kr_log_error("[tls_client] invalid certificate type %i has been received\n",
+ cert_type);
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+ unsigned int cert_list_size = 0;
+ const gnutls_datum_t *cert_list =
+ gnutls_certificate_get_peers(tls_session, &cert_list_size);
+ if (cert_list == NULL || cert_list_size == 0) {
+ kr_log_error("[tls_client] empty certificate list\n");
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ if (ctx->params->pins.len > 0)
+ /* check hash of the certificate but ignore everything else */
+ return client_verify_pin(cert_list_size, cert_list, ctx->params);
+ else
+ return client_verify_certchain(ctx->c.tls_session, ctx->params->hostname);
+}
+
+struct tls_client_ctx *tls_client_ctx_new(tls_client_param_t *entry,
+ struct worker_ctx *worker)
+{
+ struct tls_client_ctx *ctx = calloc(1, sizeof (struct tls_client_ctx));
+ if (!ctx) {
+ return NULL;
+ }
+ unsigned int flags = GNUTLS_CLIENT | GNUTLS_NONBLOCK
+#ifdef GNUTLS_ENABLE_FALSE_START
+ | GNUTLS_ENABLE_FALSE_START
+#endif
+ ;
+ int ret = gnutls_init(&ctx->c.tls_session, flags);
+ if (ret != GNUTLS_E_SUCCESS) {
+ tls_client_ctx_free(ctx);
+ return NULL;
+ }
+
+ ret = kres_gnutls_set_priority(ctx->c.tls_session);
+ if (ret != GNUTLS_E_SUCCESS) {
+ tls_client_ctx_free(ctx);
+ return NULL;
+ }
+
+ /* Must take a reference on parameters as the credentials are owned by it
+ * and must not be freed while the session is active. */
+ ++(entry->refs);
+ ctx->params = entry;
+
+ ret = gnutls_credentials_set(ctx->c.tls_session, GNUTLS_CRD_CERTIFICATE,
+ entry->credentials);
+ if (ret == GNUTLS_E_SUCCESS && entry->hostname) {
+ ret = gnutls_server_name_set(ctx->c.tls_session, GNUTLS_NAME_DNS,
+ entry->hostname, strlen(entry->hostname));
+ kr_log_verbose("[tls_client] set hostname, ret = %d\n", ret);
+ } else if (!entry->hostname) {
+ kr_log_verbose("[tls_client] no hostname\n");
+ }
+ if (ret != GNUTLS_E_SUCCESS) {
+ tls_client_ctx_free(ctx);
+ return NULL;
+ }
+
+ ctx->c.worker = worker;
+ ctx->c.client_side = true;
+
+ gnutls_transport_set_pull_function(ctx->c.tls_session, kres_gnutls_pull);
+ gnutls_transport_set_vec_push_function(ctx->c.tls_session, kres_gnutls_vec_push);
+ gnutls_transport_set_ptr(ctx->c.tls_session, ctx);
+ return ctx;
+}
+
+void tls_client_ctx_free(struct tls_client_ctx *ctx)
+{
+ if (ctx == NULL) {
+ return;
+ }
+
+ if (ctx->c.tls_session != NULL) {
+ gnutls_deinit(ctx->c.tls_session);
+ ctx->c.tls_session = NULL;
+ }
+
+ /* Must decrease the refcount for referenced parameters */
+ tls_client_param_unref(ctx->params);
+
+ free (ctx);
+}
+
+int tls_pull_timeout_func(gnutls_transport_ptr_t h, unsigned int ms)
+{
+ struct tls_common_ctx *t = (struct tls_common_ctx *)h;
+ assert(t != NULL);
+ ssize_t avail = t->nread - t->consumed;
+ DEBUG_MSG("[%s] timeout check: available: %zu\n",
+ t->client_side ? "tls_client" : "tls", avail);
+ if (avail <= 0) {
+ errno = EAGAIN;
+ return -1;
+ }
+ return avail;
+}
+
+int tls_client_connect_start(struct tls_client_ctx *client_ctx,
+ struct session *session,
+ tls_handshake_cb handshake_cb)
+{
+ if (session == NULL || client_ctx == NULL) {
+ return kr_error(EINVAL);
+ }
+
+ assert(session_flags(session)->outgoing && session_get_handle(session)->type == UV_TCP);
+
+ struct tls_common_ctx *ctx = &client_ctx->c;
+
+ gnutls_session_set_ptr(ctx->tls_session, client_ctx);
+ gnutls_handshake_set_timeout(ctx->tls_session, ctx->worker->engine->net.tcp.tls_handshake_timeout);
+ gnutls_transport_set_pull_timeout_function(ctx->tls_session, tls_pull_timeout_func);
+ session_tls_set_client_ctx(session, client_ctx);
+ ctx->handshake_cb = handshake_cb;
+ ctx->handshake_state = TLS_HS_IN_PROGRESS;
+ ctx->session = session;
+
+ tls_client_param_t *tls_params = client_ctx->params;
+ if (tls_params->session_data.data != NULL) {
+ gnutls_session_set_data(ctx->tls_session, tls_params->session_data.data,
+ tls_params->session_data.size);
+ }
+
+ /* See https://www.gnutls.org/manual/html_node/Asynchronous-operation.html */
+ while (ctx->handshake_state <= TLS_HS_IN_PROGRESS) {
+ int ret = tls_handshake(ctx, handshake_cb);
+ if (ret != kr_ok()) {
+ return ret;
+ }
+ }
+ return kr_ok();
+}
+
+tls_hs_state_t tls_get_hs_state(const struct tls_common_ctx *ctx)
+{
+ return ctx->handshake_state;
+}
+
+int tls_set_hs_state(struct tls_common_ctx *ctx, tls_hs_state_t state)
+{
+ if (state >= TLS_HS_LAST) {
+ return kr_error(EINVAL);
+ }
+ ctx->handshake_state = state;
+ return kr_ok();
+}
+
+int tls_client_ctx_set_session(struct tls_client_ctx *ctx, struct session *session)
+{
+ if (!ctx) {
+ return kr_error(EINVAL);
+ }
+ ctx->c.session = session;
+ return kr_ok();
+}
+
+#undef DEBUG_MSG
diff --git a/daemon/tls.h b/daemon/tls.h
new file mode 100644
index 0000000..8417bf0
--- /dev/null
+++ b/daemon/tls.h
@@ -0,0 +1,230 @@
+/* Copyright (C) 2016 American Civil Liberties Union (ACLU)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+*/
+
+#pragma once
+
+#include <uv.h>
+#include <gnutls/gnutls.h>
+#include <libknot/packet/pkt.h>
+#include "lib/defines.h"
+#include "lib/generic/array.h"
+#include "lib/generic/trie.h"
+#include "lib/utils.h"
+
+#define MAX_TLS_PADDING KR_EDNS_PAYLOAD
+#define TLS_MAX_UNCORK_RETRIES 100
+
+/* rfc 5476, 7.3 - handshake Protocol overview
+ * https://tools.ietf.org/html/rfc5246#page-33
+ * Message flow for a full handshake (only mandatory messages)
+ * ClientHello -------->
+ ServerHello
+ <-------- ServerHelloDone
+ ClientKeyExchange
+ Finished -------->
+ <-------- Finished
+ *
+ * See also https://blog.cloudflare.com/keyless-ssl-the-nitty-gritty-technical-details/
+ * So it takes 2 RTT.
+ * As we use session tickets, there are additional messages, add one RTT mode.
+ */
+ #define TLS_MAX_HANDSHAKE_TIME (KR_CONN_RTT_MAX * 3)
+
+/** Transport session (opaque). */
+struct session;
+
+struct tls_ctx;
+struct tls_client_ctx;
+struct tls_credentials {
+ int count;
+ char *tls_cert;
+ char *tls_key;
+ gnutls_certificate_credentials_t credentials;
+ time_t valid_until;
+ char *ephemeral_servicename;
+};
+
+
+#define TLS_SHA256_RAW_LEN 32 /* gnutls_hash_get_len(GNUTLS_DIG_SHA256) */
+/** Required buffer length for pin_sha256, including the zero terminator. */
+#define TLS_SHA256_BASE64_BUFLEN (((TLS_SHA256_RAW_LEN * 8 + 4) / 6) + 3 + 1)
+
+#if GNUTLS_VERSION_NUMBER >= 0x030400
+ #define TLS_CAN_USE_PINS 1
+#else
+ #define TLS_CAN_USE_PINS 0
+#endif
+
+
+/** TLS authentication parameters for a single address-port pair. */
+typedef struct {
+ uint32_t refs; /**< Reference count; consider TLS sessions in progress. */
+ bool insecure; /**< Use no authentication. */
+ const char *hostname; /**< Server name for SNI and certificate check, lowercased. */
+ array_t(const char *) ca_files; /**< Paths to certificate files; not really used. */
+ array_t(const uint8_t *) pins; /**< Certificate pins as raw unterminated strings.*/
+ gnutls_certificate_credentials_t credentials; /**< CA creds. in gnutls format. */
+ gnutls_datum_t session_data; /**< Session-resumption data gets stored here. */
+} tls_client_param_t;
+/** Holds configuration for TLS authentication for all potential servers.
+ * Special case: NULL pointer also means empty. */
+typedef trie_t tls_client_params_t;
+
+/** Get a pointer-to-pointer to TLS auth params.
+ * If it didn't exist, it returns NULL (if !do_insert) or pointer to NULL. */
+tls_client_param_t ** tls_client_param_getptr(tls_client_params_t **params,
+ const struct sockaddr *addr, bool do_insert);
+
+/** Get a pointer to TLS auth params or NULL. */
+static inline tls_client_param_t *
+ tls_client_param_get(tls_client_params_t *params, const struct sockaddr *addr)
+{
+ tls_client_param_t **pe = tls_client_param_getptr(&params, addr, false);
+ return pe ? *pe : NULL;
+}
+
+/** Allocate and initialize the structure (with ->ref = 1). */
+tls_client_param_t * tls_client_param_new();
+/** Reference-counted free(); any inside data is freed alongside. */
+void tls_client_param_unref(tls_client_param_t *entry);
+
+int tls_client_param_remove(tls_client_params_t *params, const struct sockaddr *addr);
+/** Free TLS authentication parameters. */
+void tls_client_params_free(tls_client_params_t *params);
+
+
+struct worker_ctx;
+struct qr_task;
+struct network;
+struct engine;
+
+typedef enum tls_client_hs_state {
+ TLS_HS_NOT_STARTED = 0,
+ TLS_HS_IN_PROGRESS,
+ TLS_HS_DONE,
+ TLS_HS_CLOSING,
+ TLS_HS_LAST
+} tls_hs_state_t;
+
+typedef int (*tls_handshake_cb) (struct session *session, int status);
+
+
+struct tls_common_ctx {
+ bool client_side;
+ gnutls_session_t tls_session;
+ tls_hs_state_t handshake_state;
+ struct session *session;
+ /* for reading from the network */
+ const uint8_t *buf;
+ ssize_t nread;
+ ssize_t consumed;
+ uint8_t recv_buf[16384];
+ tls_handshake_cb handshake_cb;
+ struct worker_ctx *worker;
+ size_t write_queue_size;
+};
+
+struct tls_ctx {
+ /*
+ * Since pointer to tls_ctx needs to be casted
+ * to tls_ctx_common in some functions,
+ * this field must be always at first position
+ */
+ struct tls_common_ctx c;
+ struct tls_credentials *credentials;
+};
+
+struct tls_client_ctx {
+ /*
+ * Since pointer to tls_client_ctx needs to be casted
+ * to tls_ctx_common in some functions,
+ * this field must be always at first position
+ */
+ struct tls_common_ctx c;
+ tls_client_param_t *params; /**< It's reference-counted. */
+};
+
+/*! Create an empty TLS context in query context */
+struct tls_ctx* tls_new(struct worker_ctx *worker);
+
+/*! Close a TLS context (call gnutls_bye()) */
+void tls_close(struct tls_common_ctx *ctx);
+
+/*! Release a TLS context */
+void tls_free(struct tls_ctx* tls);
+
+/*! Push new data to TLS context for sending */
+int tls_write(uv_write_t *req, uv_handle_t* handle, knot_pkt_t * pkt, uv_write_cb cb);
+
+/*! Unwrap incoming data from a TLS stream and pass them to TCP session.
+ * @return the number of newly-completed requests (>=0) or an error code
+ */
+ssize_t tls_process_input_data(struct session *s, const uint8_t *buf, ssize_t nread);
+
+/*! Set TLS certificate and key from files. */
+int tls_certificate_set(struct network *net, const char *tls_cert, const char *tls_key);
+
+/*! Borrow TLS credentials for context. */
+struct tls_credentials *tls_credentials_reserve(struct tls_credentials *tls_credentials);
+
+/*! Release TLS credentials for context (decrements refcount or frees). */
+int tls_credentials_release(struct tls_credentials *tls_credentials);
+
+/*! Free TLS credentials, must not be called if it holds positive refcount. */
+void tls_credentials_free(struct tls_credentials *tls_credentials);
+
+/*! Log DNS-over-TLS OOB key-pin form of current credentials:
+ * https://tools.ietf.org/html/rfc7858#appendix-A */
+void tls_credentials_log_pins(struct tls_credentials *tls_credentials);
+
+/*! Generate new ephemeral TLS credentials. */
+struct tls_credentials * tls_get_ephemeral_credentials(struct engine *engine);
+
+/*! Get TLS handshake state. */
+tls_hs_state_t tls_get_hs_state(const struct tls_common_ctx *ctx);
+
+/*! Set TLS handshake state. */
+int tls_set_hs_state(struct tls_common_ctx *ctx, tls_hs_state_t state);
+
+
+/*! Allocate new client TLS context */
+struct tls_client_ctx *tls_client_ctx_new(tls_client_param_t *entry,
+ struct worker_ctx *worker);
+
+/*! Free client TLS context */
+void tls_client_ctx_free(struct tls_client_ctx *ctx);
+
+int tls_client_connect_start(struct tls_client_ctx *client_ctx,
+ struct session *session,
+ tls_handshake_cb handshake_cb);
+
+int tls_client_ctx_set_session(struct tls_client_ctx *ctx, struct session *session);
+
+
+/* Session tickets, server side. Implementation in ./tls_session_ticket-srv.c */
+
+/*! Opaque struct used by tls_session_ticket_* functions. */
+struct tls_session_ticket_ctx;
+
+/*! Suggested maximum reasonable secret length. */
+#define TLS_SESSION_TICKET_SECRET_MAX_LEN 1024
+
+/*! Create a session ticket context and initialize it (secret gets copied inside).
+ *
+ * Passing zero-length secret implies using a random key, i.e. not synchronized
+ * between multiple instances.
+ *
+ * Beware that knowledge of the secret (if nonempty) breaks forward secrecy,
+ * so you should rotate the secret regularly and securely erase all past secrets.
+ * With TLS < 1.3 it's probably too risky to set nonempty secret.
+ */
+struct tls_session_ticket_ctx * tls_session_ticket_ctx_create(
+ uv_loop_t *loop, const char *secret, size_t secret_len);
+
+/*! Try to enable session tickets for a server session. */
+void tls_session_ticket_enable(struct tls_session_ticket_ctx *ctx, gnutls_session_t session);
+
+/*! Free all resources of the session ticket context. NULL is accepted as well. */
+void tls_session_ticket_ctx_destroy(struct tls_session_ticket_ctx *ctx);
+
diff --git a/daemon/tls_ephemeral_credentials.c b/daemon/tls_ephemeral_credentials.c
new file mode 100644
index 0000000..29128f6
--- /dev/null
+++ b/daemon/tls_ephemeral_credentials.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2016 American Civil Liberties Union (ACLU)
+ * Copyright (C) 2016-2017 CZ.NIC, z.s.p.o.
+ *
+ * Initial Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <sys/file.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+#include <gnutls/crypto.h>
+
+#include "daemon/worker.h"
+#include "daemon/tls.h"
+
+#define EPHEMERAL_PRIVKEY_FILENAME "ephemeral_key.pem"
+#define INVALID_HOSTNAME "dns-over-tls.invalid"
+#define EPHEMERAL_CERT_EXPIRATION_SECONDS (60*60*24*90)
+
+/* This is an attempt to grab an exclusive, advisory, non-blocking
+ * lock based on a filename. At the moment it's POSIX-only, but it
+ * should be abstract enough of an interface to make an implementation
+ * for non-posix systems if anyone cares. */
+typedef int lock_t;
+static bool _lock_is_invalid(lock_t lock)
+{
+ return lock == -1;
+}
+/* a blocking lock on a given filename */
+static lock_t _lock_filename(const char *fname)
+{
+ lock_t lockfd = open(fname, O_RDONLY|O_CREAT, 0400);
+ if (lockfd == -1)
+ return lockfd;
+ /* this should be a non-blocking lock */
+ if (flock(lockfd, LOCK_EX | LOCK_NB) != 0) {
+ close(lockfd);
+ return -1;
+ }
+ return lockfd; /* for cleanup later */
+}
+static void _lock_unlock(lock_t *lock, const char *fname)
+{
+ if (lock && !_lock_is_invalid(*lock)) {
+ flock(*lock, LOCK_UN);
+ close(*lock);
+ *lock = -1;
+ unlink(fname); /* ignore errors */
+ }
+}
+
+static gnutls_x509_privkey_t get_ephemeral_privkey ()
+{
+ gnutls_x509_privkey_t privkey = NULL;
+ int err;
+ gnutls_datum_t data = { .data = NULL, .size = 0 };
+ lock_t lock;
+ int datafd = -1;
+
+ /* Take a lock to ensure that two daemons started concurrently
+ * with a shared cache don't both create the same privkey: */
+ lock = _lock_filename(EPHEMERAL_PRIVKEY_FILENAME ".lock");
+ if (_lock_is_invalid(lock)) {
+ kr_log_error("[tls] unable to lock lockfile " EPHEMERAL_PRIVKEY_FILENAME ".lock\n");
+ goto done;
+ }
+
+ if ((err = gnutls_x509_privkey_init (&privkey)) < 0) {
+ kr_log_error("[tls] gnutls_x509_privkey_init() failed: %d (%s)\n",
+ err, gnutls_strerror_name(err));
+ goto done;
+ }
+
+ /* read from cache file (we assume that we've chdir'ed
+ * already, so we're just looking for the file in the
+ * cachedir. */
+ datafd = open(EPHEMERAL_PRIVKEY_FILENAME, O_RDONLY);
+ if (datafd != -1) {
+ struct stat stat;
+ ssize_t bytes_read;
+ if (fstat(datafd, &stat)) {
+ kr_log_error("[tls] unable to stat ephemeral private key " EPHEMERAL_PRIVKEY_FILENAME "\n");
+ goto bad_data;
+ }
+ data.data = gnutls_malloc(stat.st_size);
+ if (data.data == NULL) {
+ kr_log_error("[tls] unable to allocate memory for reading ephemeral private key\n");
+ goto bad_data;
+ }
+ data.size = stat.st_size;
+ bytes_read = read(datafd, data.data, stat.st_size);
+ if (bytes_read != stat.st_size) {
+ kr_log_error("[tls] unable to read ephemeral private key\n");
+ goto bad_data;
+ }
+ if ((err = gnutls_x509_privkey_import (privkey, &data, GNUTLS_X509_FMT_PEM)) < 0) {
+ kr_log_error("[tls] gnutls_x509_privkey_import() failed: %d (%s)\n",
+ err, gnutls_strerror_name(err));
+ /* goto bad_data; */
+ bad_data:
+ close(datafd);
+ datafd = -1;
+ }
+ if (data.data != NULL) {
+ gnutls_free(data.data);
+ data.data = NULL;
+ }
+ }
+ if (datafd == -1) {
+ /* if loading failed, then generate ... */
+#if GNUTLS_VERSION_NUMBER >= 0x030500
+ if ((err = gnutls_x509_privkey_generate(privkey, GNUTLS_PK_ECDSA, GNUTLS_CURVE_TO_BITS(GNUTLS_ECC_CURVE_SECP256R1), 0)) < 0) {
+#else
+ if ((err = gnutls_x509_privkey_generate(privkey, GNUTLS_PK_RSA, gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_MEDIUM), 0)) < 0) {
+#endif
+ kr_log_error("[tls] gnutls_x509_privkey_init() failed: %d (%s)\n",
+ err, gnutls_strerror_name(err));
+ gnutls_x509_privkey_deinit(privkey);
+ goto done;
+ }
+ /* ... and save */
+ kr_log_info("[tls] Stashing ephemeral private key in " EPHEMERAL_PRIVKEY_FILENAME "\n");
+ if ((err = gnutls_x509_privkey_export2(privkey, GNUTLS_X509_FMT_PEM, &data)) < 0) {
+ kr_log_error("[tls] gnutls_x509_privkey_export2() failed: %d (%s), not storing\n",
+ err, gnutls_strerror_name(err));
+ } else {
+ datafd = open(EPHEMERAL_PRIVKEY_FILENAME, O_WRONLY|O_CREAT, 0600);
+ if (datafd == -1) {
+ kr_log_error("[tls] failed to open " EPHEMERAL_PRIVKEY_FILENAME " to store the ephemeral key\n");
+ } else {
+ ssize_t bytes_written;
+ bytes_written = write(datafd, data.data, data.size);
+ if (bytes_written != data.size)
+ kr_log_error("[tls] failed to write %d octets to "
+ EPHEMERAL_PRIVKEY_FILENAME
+ " (%zd written)\n",
+ data.size, bytes_written);
+ }
+ }
+ }
+ done:
+ _lock_unlock(&lock, EPHEMERAL_PRIVKEY_FILENAME ".lock");
+ if (datafd != -1) {
+ close(datafd);
+ }
+ if (data.data != NULL) {
+ gnutls_free(data.data);
+ }
+ return privkey;
+}
+
+static gnutls_x509_crt_t get_ephemeral_cert(gnutls_x509_privkey_t privkey, const char *servicename, time_t invalid_before, time_t valid_until)
+{
+ gnutls_x509_crt_t cert = NULL;
+ int err;
+ /* need a random buffer of bytes */
+ uint8_t serial[16];
+ gnutls_rnd(GNUTLS_RND_NONCE, serial, sizeof(serial));
+ /* clear the left-most bit to avoid signedness confusion: */
+ serial[0] &= 0x8f;
+ size_t namelen = strlen(servicename);
+
+#define gtx(fn, ...) \
+ if ((err = fn ( __VA_ARGS__ )) != GNUTLS_E_SUCCESS) { \
+ kr_log_error("[tls] " #fn "() failed: %d (%s)\n", \
+ err, gnutls_strerror_name(err)); \
+ goto bad; }
+
+ gtx(gnutls_x509_crt_init, &cert);
+ gtx(gnutls_x509_crt_set_activation_time, cert, invalid_before);
+ gtx(gnutls_x509_crt_set_ca_status, cert, 0);
+ gtx(gnutls_x509_crt_set_expiration_time, cert, valid_until);
+ gtx(gnutls_x509_crt_set_key, cert, privkey);
+ gtx(gnutls_x509_crt_set_key_purpose_oid, cert, GNUTLS_KP_TLS_WWW_CLIENT, 0);
+ gtx(gnutls_x509_crt_set_key_purpose_oid, cert, GNUTLS_KP_TLS_WWW_SERVER, 0);
+ gtx(gnutls_x509_crt_set_key_usage, cert, GNUTLS_KEY_DIGITAL_SIGNATURE);
+ gtx(gnutls_x509_crt_set_serial, cert, serial, sizeof(serial));
+ gtx(gnutls_x509_crt_set_subject_alt_name, cert, GNUTLS_SAN_DNSNAME, servicename, namelen, GNUTLS_FSAN_SET);
+ gtx(gnutls_x509_crt_set_dn_by_oid,cert, GNUTLS_OID_X520_COMMON_NAME, 0, servicename, namelen);
+ gtx(gnutls_x509_crt_set_version, cert, 3);
+ gtx(gnutls_x509_crt_sign2,cert, cert, privkey, GNUTLS_DIG_SHA256, 0); /* self-sign, since it doesn't look like we can just stub-sign */
+#undef gtx
+
+ return cert;
+bad:
+ gnutls_x509_crt_deinit(cert);
+ return NULL;
+}
+
+struct tls_credentials * tls_get_ephemeral_credentials(struct engine *engine)
+{
+ struct tls_credentials *creds = NULL;
+ gnutls_x509_privkey_t privkey = NULL;
+ gnutls_x509_crt_t cert = NULL;
+ int err;
+ time_t now = time(NULL);
+
+ creds = calloc(1, sizeof(*creds));
+ if (!creds) {
+ kr_log_error("[tls] failed to allocate memory for ephemeral credentials\n");
+ return NULL;
+ }
+ if ((err = gnutls_certificate_allocate_credentials(&(creds->credentials))) < 0) {
+ kr_log_error("[tls] failed to allocate memory for ephemeral credentials\n");
+ goto failure;
+ }
+
+ creds->valid_until = now + EPHEMERAL_CERT_EXPIRATION_SECONDS;
+ creds->ephemeral_servicename = strdup(engine_get_hostname(engine));
+ if (creds->ephemeral_servicename == NULL) {
+ kr_log_error("[tls] could not get server's hostname, using '" INVALID_HOSTNAME "' instead\n");
+ if ((creds->ephemeral_servicename = strdup(INVALID_HOSTNAME)) == NULL) {
+ kr_log_error("[tls] failed to allocate memory for ephemeral credentials\n");
+ goto failure;
+ }
+ }
+ if ((privkey = get_ephemeral_privkey()) == NULL) {
+ goto failure;
+ }
+ if ((cert = get_ephemeral_cert(privkey, creds->ephemeral_servicename, now - 60*15, creds->valid_until)) == NULL) {
+ goto failure;
+ }
+ if ((err = gnutls_certificate_set_x509_key(creds->credentials, &cert, 1, privkey)) < 0) {
+ kr_log_error("[tls] failed to set up ephemeral credentials\n");
+ goto failure;
+ }
+ gnutls_x509_privkey_deinit(privkey);
+ gnutls_x509_crt_deinit(cert);
+ return creds;
+ failure:
+ gnutls_x509_privkey_deinit(privkey);
+ gnutls_x509_crt_deinit(cert);
+ tls_credentials_free(creds);
+ return NULL;
+}
diff --git a/daemon/tls_session_ticket-srv.c b/daemon/tls_session_ticket-srv.c
new file mode 100644
index 0000000..ac4fb2e
--- /dev/null
+++ b/daemon/tls_session_ticket-srv.c
@@ -0,0 +1,246 @@
+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+#include <uv.h>
+
+#include "lib/utils.h"
+
+/* Style: "local/static" identifiers are usually named tst_* */
+
+/** The number of seconds between synchronized rotation of TLS session ticket key. */
+#define TST_KEY_LIFETIME 4096
+
+/** Value from gnutls:lib/ext/session_ticket.c
+ * Beware: changing this needs to change the hashing implementation. */
+#define SESSION_KEY_SIZE 64
+
+/** Compile-time support for setting the secret. */
+/* This is not secure with TLS <= 1.2 but TLS 1.3 and secure configuration
+ * is not available in GnuTLS yet. See https://gitlab.com/gnutls/gnutls/issues/477 */
+#define TLS_SESSION_RESUMPTION_SYNC (GNUTLS_VERSION_NUMBER >= 0x030603)
+#if TLS_SESSION_RESUMPTION_SYNC
+ #define TST_HASH GNUTLS_DIG_SHA3_512
+#else
+ #define TST_HASH abort()
+#endif
+
+#if GNUTLS_VERSION_NUMBER < 0x030400
+ /* It's of little use anyway. We may get the secret through lua,
+ * which creates a copy outside of our control. */
+ #define gnutls_memset memset
+#endif
+
+/** Fields are internal to tst_key_* functions. */
+typedef struct tls_session_ticket_ctx {
+ uv_timer_t timer; /**< timer for rotation of the key */
+ unsigned char key[SESSION_KEY_SIZE]; /**< the key itself */
+ bool has_secret; /**< false -> key is random for each epoch */
+ uint16_t hash_len; /**< length of `hash_data` */
+ char hash_data[]; /**< data to hash to obtain `key`;
+ * it's `time_t epoch` and then the secret string */
+} tst_ctx_t;
+
+/** Check invariants, based on gnutls version. */
+static bool tst_key_invariants(void)
+{
+ static int result = 0; /*< cache for multiple invocations */
+ if (result) return result > 0;
+ bool ok = true;
+ #if TLS_SESSION_RESUMPTION_SYNC
+ /* SHA3-512 output size may never change, but let's check it anyway :-) */
+ ok = ok && gnutls_hash_get_len(TST_HASH) == SESSION_KEY_SIZE;
+ #endif
+ /* The ticket key size might change in a different gnutls version. */
+ gnutls_datum_t key = { 0, 0 };
+ ok = ok && gnutls_session_ticket_key_generate(&key) == 0
+ && key.size == SESSION_KEY_SIZE;
+ free(key.data);
+ result = ok ? 1 : -1;
+ return ok;
+}
+
+/** Create the internal structures and copy the secret. Beware: secret must be kept secure. */
+static tst_ctx_t * tst_key_create(const char *secret, size_t secret_len, uv_loop_t *loop)
+{
+ const size_t hash_len = sizeof(time_t) + secret_len;
+ if (secret_len &&
+ (!secret || hash_len > UINT16_MAX || hash_len < secret_len)) {
+ assert(!EINVAL);
+ return NULL;
+ /* reasonable secret_len is best enforced in config API */
+ }
+ if (!tst_key_invariants()) {
+ assert(!EFAULT);
+ return NULL;
+ }
+ #if !TLS_SESSION_RESUMPTION_SYNC
+ if (secret_len) {
+ kr_log_error("[tls] session ticket: secrets were not enabled at compile-time (your GnuTLS version is not supported)\n");
+ return NULL; /* ENOTSUP */
+ }
+ #endif
+
+ tst_ctx_t *ctx = malloc(sizeof(*ctx) + hash_len); /* can be slightly longer */
+ if (!ctx) return NULL;
+ ctx->has_secret = secret_len > 0;
+ ctx->hash_len = hash_len;
+ if (secret_len) {
+ memcpy(ctx->hash_data + sizeof(time_t), secret, secret_len);
+ }
+
+ if (uv_timer_init(loop, &ctx->timer) != 0) {
+ free(ctx);
+ return NULL;
+ }
+ ctx->timer.data = ctx;
+ return ctx;
+}
+
+/** Random variant of secret rotation: generate into key_tmp and copy. */
+static int tst_key_get_random(tst_ctx_t *ctx)
+{
+ gnutls_datum_t key_tmp = { NULL, 0 };
+ int err = gnutls_session_ticket_key_generate(&key_tmp);
+ if (err) return kr_error(err);
+ if (key_tmp.size != SESSION_KEY_SIZE) {
+ assert(!EFAULT);
+ return kr_error(EFAULT);
+ }
+ memcpy(ctx->key, key_tmp.data, SESSION_KEY_SIZE);
+ gnutls_memset(key_tmp.data, 0, SESSION_KEY_SIZE);
+ free(key_tmp.data);
+ return kr_ok();
+}
+
+/** Recompute the session ticket key, if epoch has changed or forced. */
+static int tst_key_update(tst_ctx_t *ctx, time_t epoch, bool force_update)
+{
+ if (!ctx || ctx->hash_len < sizeof(epoch)) {
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+ }
+ /* documented limitation: time_t and endianess must match
+ * on instances sharing a secret */
+ if (!force_update && memcmp(ctx->hash_data, &epoch, sizeof(epoch)) == 0) {
+ return kr_ok(); /* we are up to date */
+ }
+ memcpy(ctx->hash_data, &epoch, sizeof(epoch));
+
+ if (!ctx->has_secret) {
+ return tst_key_get_random(ctx);
+ }
+ /* Otherwise, deterministic variant of secret rotation, if supported. */
+ #if !TLS_SESSION_RESUMPTION_SYNC
+ assert(false);
+ return kr_error(ENOTSUP);
+ #else
+ int err = gnutls_hash_fast(TST_HASH, ctx->hash_data,
+ ctx->hash_len, ctx->key);
+ return err == 0 ? kr_ok() : kr_error(err);
+ #endif
+}
+
+/** Free all resources of the key (securely). */
+static void tst_key_destroy(uv_handle_t *timer)
+{
+ assert(timer);
+ tst_ctx_t *ctx = timer->data;
+ assert(ctx);
+ gnutls_memset(ctx, 0, offsetof(tst_ctx_t, hash_data) + ctx->hash_len);
+ free(ctx);
+}
+
+static void tst_key_check(uv_timer_t *timer, bool force_update);
+static void tst_timer_callback(uv_timer_t *timer)
+{
+ tst_key_check(timer, false);
+}
+
+/** Update the ST key if needed and reschedule itself via the timer. */
+static void tst_key_check(uv_timer_t *timer, bool force_update)
+{
+ tst_ctx_t *stst = (tst_ctx_t *)timer->data;
+ /* Compute the current epoch. */
+ struct timeval now;
+ if (gettimeofday(&now, NULL)) {
+ kr_log_error("[tls] session ticket: gettimeofday failed, %s\n",
+ strerror(errno));
+ return;
+ }
+ uv_update_time(timer->loop); /* to have sync. between real and mono time */
+ const time_t epoch = now.tv_sec / TST_KEY_LIFETIME;
+ /* Update the key; new sessions will fetch it from the location.
+ * Old ones hopefully can't get broken by that; documentation
+ * for gnutls_session_ticket_enable_server() doesn't say. */
+ int err = tst_key_update(stst, epoch, force_update);
+ if (err) {
+ assert(err != kr_error(EINVAL));
+ kr_log_error("[tls] session ticket: failed rotation, err = %d\n", err);
+ }
+ /* Reschedule. */
+ const time_t tv_sec_next = (epoch + 1) * TST_KEY_LIFETIME;
+ const uint64_t ms_until_second = 1000 - (now.tv_usec + 501) / 1000;
+ const uint64_t remain_ms = (tv_sec_next - now.tv_sec - 1) * (uint64_t)1000
+ + ms_until_second + 1;
+ /* ^ +1 because we don't want to wake up half a millisecond before the epoch! */
+ assert(remain_ms < (TST_KEY_LIFETIME + 1 /*rounding tolerance*/) * 1000);
+ kr_log_verbose("[tls] session ticket: epoch %"PRIu64
+ ", scheduling rotation check in %"PRIu64" ms\n",
+ (uint64_t)epoch, remain_ms);
+ err = uv_timer_start(timer, &tst_timer_callback, remain_ms, 0);
+ if (err) {
+ assert(false);
+ kr_log_error("[tls] session ticket: failed to schedule, err = %d\n", err);
+ }
+}
+
+/* Implementation for prototypes from ./tls.h */
+
+void tls_session_ticket_enable(struct tls_session_ticket_ctx *ctx, gnutls_session_t session)
+{
+ assert(ctx && session);
+ const gnutls_datum_t gd = {
+ .size = SESSION_KEY_SIZE,
+ .data = ctx->key,
+ };
+ int err = gnutls_session_ticket_enable_server(session, &gd);
+ if (err) {
+ kr_log_error("[tls] failed to enable session tickets: %s (%d)\n",
+ gnutls_strerror_name(err), err);
+ /* but continue without tickets */
+ }
+}
+
+tst_ctx_t * tls_session_ticket_ctx_create(uv_loop_t *loop, const char *secret,
+ size_t secret_len)
+{
+ assert(loop && (!secret_len || secret));
+ #if GNUTLS_VERSION_NUMBER < 0x030500
+ /* We would need different SESSION_KEY_SIZE; avoid assert. */
+ return NULL;
+ #endif
+ tst_ctx_t *ctx = tst_key_create(secret, secret_len, loop);
+ if (ctx) {
+ tst_key_check(&ctx->timer, true);
+ }
+ return ctx;
+}
+
+void tls_session_ticket_ctx_destroy(tst_ctx_t *ctx)
+{
+ if (ctx == NULL) {
+ return;
+ }
+ uv_close((uv_handle_t *)&ctx->timer, &tst_key_destroy);
+}
+
diff --git a/daemon/udp_queue.c b/daemon/udp_queue.c
new file mode 100644
index 0000000..4d2f27a
--- /dev/null
+++ b/daemon/udp_queue.c
@@ -0,0 +1,145 @@
+/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "kresconfig.h"
+#include "daemon/udp_queue.h"
+
+#include "daemon/session.h"
+#include "daemon/worker.h"
+#include "lib/generic/array.h"
+#include "lib/utils.h"
+
+struct qr_task;
+
+#include <assert.h>
+#include <sys/socket.h>
+
+
+#if !ENABLE_SENDMMSG
+int udp_queue_init_global(uv_loop_t *loop)
+{
+ return 0;
+}
+/* Appease the linker in case this unused call isn't optimized out. */
+void udp_queue_push(int fd, struct kr_request *req, struct qr_task *task)
+{
+ abort();
+}
+#else
+
+/* LATER: it might be useful to have this configurable during runtime,
+ * but the structures below would have to change a little (broken up). */
+#define UDP_QUEUE_LEN 64
+
+/** A queue of up to UDP_QUEUE_LEN messages, meant for the same socket. */
+typedef struct {
+ int len; /**< The number of messages in the queue: 0..UDP_QUEUE_LEN */
+ struct mmsghdr msgvec[UDP_QUEUE_LEN]; /**< Parameter for sendmmsg() */
+ struct {
+ struct qr_task *task; /**< Links for completion callbacks. */
+ struct iovec msg_iov[1]; /**< storage for .msgvec[i].msg_iov */
+ } items[UDP_QUEUE_LEN];
+} udp_queue_t;
+
+static udp_queue_t * udp_queue_create()
+{
+ udp_queue_t *q = calloc(1, sizeof(*q));
+ for (int i = 0; i < UDP_QUEUE_LEN; ++i) {
+ struct msghdr *mhi = &q->msgvec[i].msg_hdr;
+ /* These shall remain always the same. */
+ mhi->msg_iov = q->items[i].msg_iov;
+ mhi->msg_iovlen = 1;
+ /* msg_name and msg_namelen will be per-call,
+ * and the rest is OK to remain zeroed all the time. */
+ }
+ return q;
+}
+
+/** Global state for udp_queue_*. Note: we never free the pointed-to memory. */
+struct {
+ /** Singleton map: fd -> udp_queue_t, as a simple array of pointers. */
+ udp_queue_t **udp_queues;
+ int udp_queues_len;
+
+ /** List of FD numbers that might have a non-empty queue. */
+ array_t(int) waiting_fds;
+
+ uv_check_t check_handle;
+} static state = {0};
+
+/** Empty the given queue. The queue is assumed to exist (but may be empty). */
+static void udp_queue_send(int fd)
+{
+ udp_queue_t *const q = state.udp_queues[fd];
+ if (!q->len) return;
+ int sent_len = sendmmsg(fd, q->msgvec, q->len, 0);
+ /* ATM we don't really do anything about failures. */
+ int err = sent_len < 0 ? errno : EAGAIN /* unknown error, really */;
+ for (int i = 0; i < q->len; ++i) {
+ qr_task_on_send(q->items[i].task, NULL, i < sent_len ? 0 : err);
+ worker_task_unref(q->items[i].task);
+ }
+ q->len = 0;
+}
+
+/** Periodical callback to send all queued packets. */
+static void udp_queue_check(uv_check_t *handle)
+{
+ for (int i = 0; i < state.waiting_fds.len; ++i) {
+ udp_queue_send(state.waiting_fds.at[i]);
+ }
+ state.waiting_fds.len = 0;
+}
+
+int udp_queue_init_global(uv_loop_t *loop)
+{
+ int ret = uv_check_init(loop, &state.check_handle);
+ if (!ret) ret = uv_check_start(&state.check_handle, udp_queue_check);
+ return ret;
+}
+
+void udp_queue_push(int fd, struct kr_request *req, struct qr_task *task)
+{
+ if (fd < 0) {
+ kr_log_error("ERROR: called udp_queue_push(fd = %d, ...)\n", fd);
+ abort();
+ }
+ worker_task_ref(task);
+ /* Get a valid correct queue. */
+ if (fd >= state.udp_queues_len) {
+ const int new_len = fd + 1;
+ state.udp_queues = realloc(state.udp_queues,
+ sizeof(state.udp_queues[0]) * new_len);
+ if (!state.udp_queues) abort();
+ memset(state.udp_queues + state.udp_queues_len, 0,
+ sizeof(state.udp_queues[0]) * (new_len - state.udp_queues_len));
+ state.udp_queues_len = new_len;
+ }
+ if (unlikely(state.udp_queues[fd] == NULL))
+ state.udp_queues[fd] = udp_queue_create();
+ udp_queue_t *const q = state.udp_queues[fd];
+
+ /* Append to the queue */
+ struct sockaddr *sa = (struct sockaddr *)/*const-cast*/req->qsource.addr;
+ q->msgvec[q->len].msg_hdr.msg_name = sa;
+ q->msgvec[q->len].msg_hdr.msg_namelen = kr_sockaddr_len(sa);
+ q->items[q->len].task = task;
+ q->items[q->len].msg_iov[0] = (struct iovec){
+ .iov_base = req->answer->wire,
+ .iov_len = req->answer->size,
+ };
+ if (q->len == 0)
+ array_push(state.waiting_fds, fd);
+ ++(q->len);
+
+ if (q->len >= UDP_QUEUE_LEN) {
+ assert(q->len == UDP_QUEUE_LEN);
+ udp_queue_send(fd);
+ /* We don't need to search state.waiting_fds;
+ * anyway, it's more efficient to let the hook do that. */
+ }
+}
+
+#endif
+
diff --git a/daemon/udp_queue.h b/daemon/udp_queue.h
new file mode 100644
index 0000000..43fd56f
--- /dev/null
+++ b/daemon/udp_queue.h
@@ -0,0 +1,16 @@
+/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <uv.h>
+struct kr_request;
+struct qr_task;
+
+/** Initialize the global state for udp_queue. */
+int udp_queue_init_global(uv_loop_t *loop);
+
+/** Send req->answer via UDP, possibly not immediately. */
+void udp_queue_push(int fd, struct kr_request *req, struct qr_task *task);
+
diff --git a/daemon/worker.c b/daemon/worker.c
new file mode 100644
index 0000000..b13bb39
--- /dev/null
+++ b/daemon/worker.c
@@ -0,0 +1,2209 @@
+/* Copyright (C) 2014-2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "kresconfig.h"
+#include "daemon/worker.h"
+
+#include <uv.h>
+#include <lua.h>
+#include <lauxlib.h>
+#include <libknot/packet/pkt.h>
+#include <libknot/descriptor.h>
+#include <contrib/cleanup.h>
+#include <contrib/ucw/lib.h>
+#include <contrib/ucw/mempool.h>
+#include <contrib/wire.h>
+#if defined(__GLIBC__) && defined(_GNU_SOURCE)
+#include <malloc.h>
+#endif
+#include <assert.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+
+#if ENABLE_XDP
+ #include <libknot/xdp/xdp.h>
+#endif
+
+#include "daemon/bindings/api.h"
+#include "daemon/engine.h"
+#include "daemon/io.h"
+#include "daemon/session.h"
+#include "daemon/tls.h"
+#include "daemon/http.h"
+#include "daemon/udp_queue.h"
+#include "daemon/zimport.h"
+#include "lib/layer.h"
+#include "lib/utils.h"
+
+
+/* Magic defaults for the worker. */
+#ifndef MP_FREELIST_SIZE
+# ifdef __clang_analyzer__
+# define MP_FREELIST_SIZE 0
+# else
+# define MP_FREELIST_SIZE 64 /**< Maximum length of the worker mempool freelist */
+# endif
+#endif
+#ifndef QUERY_RATE_THRESHOLD
+#define QUERY_RATE_THRESHOLD (2 * MP_FREELIST_SIZE) /**< Nr of parallel queries considered as high rate */
+#endif
+#ifndef MAX_PIPELINED
+#define MAX_PIPELINED 100
+#endif
+
+#define VERBOSE_MSG(qry, ...) QRVERBOSE(qry, "wrkr", __VA_ARGS__)
+
+/** Client request state. */
+struct request_ctx
+{
+ struct kr_request req;
+
+ struct worker_ctx *worker;
+ struct qr_task *task;
+ struct {
+ /** NULL if the request didn't come over network. */
+ struct session *session;
+ /** Requestor's address; separate because of UDP session "sharing". */
+ union inaddr addr;
+ /** Local address. For AF_XDP we couldn't use session's,
+ * as the address might be different every time. */
+ union inaddr dst_addr;
+ /** MAC addresses - ours [0] and router's [1], in case of AF_XDP socket. */
+ uint8_t eth_addrs[2][6];
+ } source;
+};
+
+/** Query resolution task. */
+struct qr_task
+{
+ struct request_ctx *ctx;
+ knot_pkt_t *pktbuf;
+ qr_tasklist_t waiting;
+ struct session *pending[MAX_PENDING];
+ uint16_t pending_count;
+ uint16_t timeouts;
+ uint16_t iter_count;
+ uint32_t refs;
+ bool finished : 1;
+ bool leading : 1;
+ uint64_t creation_time;
+ uint64_t send_time;
+ uint64_t recv_time;
+ struct kr_transport *transport;
+};
+
+
+/* Convenience macros */
+#define qr_task_ref(task) \
+ do { ++(task)->refs; } while(0)
+#define qr_task_unref(task) \
+ do { \
+ if (task) \
+ assert((task)->refs > 0); \
+ if ((task) && --(task)->refs == 0) \
+ qr_task_free((task)); \
+ } while (0)
+
+/** @internal get key for tcp session
+ * @note kr_straddr() return pointer to static string
+ */
+#define tcpsess_key(addr) kr_straddr(addr)
+
+/* Forward decls */
+static void qr_task_free(struct qr_task *task);
+static int qr_task_step(struct qr_task *task,
+ const struct sockaddr *packet_source,
+ knot_pkt_t *packet);
+static int qr_task_send(struct qr_task *task, struct session *session,
+ const struct sockaddr *addr, knot_pkt_t *pkt);
+static int qr_task_finalize(struct qr_task *task, int state);
+static void qr_task_complete(struct qr_task *task);
+struct session* worker_find_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr *addr);
+static int worker_add_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr *addr,
+ struct session *session);
+struct session* worker_find_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr *addr);
+static void on_tcp_connect_timeout(uv_timer_t *timer);
+static void on_udp_timeout(uv_timer_t *timer);
+static void subreq_finalize(struct qr_task *task, const struct sockaddr *packet_source, knot_pkt_t *pkt);
+
+
+struct worker_ctx the_worker_value; /**< Static allocation is suitable for the singleton. */
+struct worker_ctx *the_worker = NULL;
+
+/*! @internal Create a UDP/TCP handle for an outgoing AF_INET* connection.
+ * socktype is SOCK_* */
+static uv_handle_t *ioreq_spawn(struct worker_ctx *worker,
+ int socktype, sa_family_t family, bool has_tls,
+ bool has_http)
+{
+ bool precond = (socktype == SOCK_DGRAM || socktype == SOCK_STREAM)
+ && (family == AF_INET || family == AF_INET6);
+ if (!precond) {
+ assert(false);
+ kr_log_verbose("[work] ioreq_spawn: pre-condition failed\n");
+ return NULL;
+ }
+
+ /* Create connection for iterative query */
+ uv_handle_t *handle = malloc(socktype == SOCK_DGRAM
+ ? sizeof(uv_udp_t) : sizeof(uv_tcp_t));
+ if (!handle) {
+ return NULL;
+ }
+ int ret = io_create(worker->loop, handle, socktype, family, has_tls, has_http);
+ if (ret) {
+ if (ret == UV_EMFILE) {
+ worker->too_many_open = true;
+ worker->rconcurrent_highwatermark = worker->stats.rconcurrent;
+ }
+ free(handle);
+ return NULL;
+ }
+
+ /* Bind to outgoing address, according to IP v4/v6. */
+ union inaddr *addr;
+ if (family == AF_INET) {
+ addr = (union inaddr *)&worker->out_addr4;
+ } else {
+ addr = (union inaddr *)&worker->out_addr6;
+ }
+ if (addr->ip.sa_family != AF_UNSPEC) {
+ assert(addr->ip.sa_family == family);
+ if (socktype == SOCK_DGRAM) {
+ uv_udp_t *udp = (uv_udp_t *)handle;
+ ret = uv_udp_bind(udp, &addr->ip, 0);
+ } else if (socktype == SOCK_STREAM){
+ uv_tcp_t *tcp = (uv_tcp_t *)handle;
+ ret = uv_tcp_bind(tcp, &addr->ip, 0);
+ }
+ }
+
+ if (ret != 0) {
+ io_free(handle);
+ return NULL;
+ }
+
+ /* Set current handle as a subrequest type. */
+ struct session *session = handle->data;
+ session_flags(session)->outgoing = true;
+ /* Connect or issue query datagram */
+ return handle;
+}
+
+static void ioreq_kill_pending(struct qr_task *task)
+{
+ for (uint16_t i = 0; i < task->pending_count; ++i) {
+ session_kill_ioreq(task->pending[i], task);
+ }
+ task->pending_count = 0;
+}
+
+/** @cond This memory layout is internal to mempool.c, use only for debugging. */
+#if defined(__SANITIZE_ADDRESS__)
+struct mempool_chunk {
+ struct mempool_chunk *next;
+ size_t size;
+};
+static void mp_poison(struct mempool *mp, bool poison)
+{
+ if (!poison) { /* @note mempool is part of the first chunk, unpoison it first */
+ kr_asan_unpoison(mp, sizeof(*mp));
+ }
+ struct mempool_chunk *chunk = mp->state.last[0];
+ void *chunk_off = (uint8_t *)chunk - chunk->size;
+ if (poison) {
+ kr_asan_poison(chunk_off, chunk->size);
+ } else {
+ kr_asan_unpoison(chunk_off, chunk->size);
+ }
+}
+#else
+#define mp_poison(mp, enable)
+#endif
+/** @endcond */
+
+/** Get a mempool. (Recycle if possible.) */
+static inline struct mempool *pool_borrow(struct worker_ctx *worker)
+{
+ struct mempool *mp = NULL;
+ if (worker->pool_mp.len > 0) {
+ mp = array_tail(worker->pool_mp);
+ array_pop(worker->pool_mp);
+ mp_poison(mp, 0);
+ } else { /* No mempool on the freelist, create new one */
+ mp = mp_new (4 * CPU_PAGE_SIZE);
+ }
+ return mp;
+}
+
+/** Return a mempool. (Cache them up to some count.) */
+static inline void pool_release(struct worker_ctx *worker, struct mempool *mp)
+{
+ if (worker->pool_mp.len < MP_FREELIST_SIZE) {
+ mp_flush(mp);
+ array_push(worker->pool_mp, mp);
+ mp_poison(mp, 1);
+ } else {
+ mp_delete(mp);
+ }
+}
+
+/** Create a key for an outgoing subrequest: qname, qclass, qtype.
+ * @param key Destination buffer for key size, MUST be SUBREQ_KEY_LEN or larger.
+ * @return key length if successful or an error
+ */
+static const size_t SUBREQ_KEY_LEN = KR_RRKEY_LEN;
+static int subreq_key(char *dst, knot_pkt_t *pkt)
+{
+ assert(pkt);
+ return kr_rrkey(dst, knot_pkt_qclass(pkt), knot_pkt_qname(pkt),
+ knot_pkt_qtype(pkt), knot_pkt_qtype(pkt));
+}
+
+#if ENABLE_XDP
+static uint8_t *alloc_wire_cb(struct kr_request *req, uint16_t *maxlen)
+{
+ assert(maxlen);
+ struct request_ctx *ctx = (struct request_ctx *)req;
+ /* We know it's an AF_XDP socket; otherwise this CB isn't assigned. */
+ uv_handle_t *handle = session_get_handle(ctx->source.session);
+ assert(handle->type == UV_POLL);
+ xdp_handle_data_t *xhd = handle->data;
+ knot_xdp_msg_t out;
+ bool ipv6 = ctx->source.addr.ip.sa_family == AF_INET6;
+ int ret = knot_xdp_send_alloc(xhd->socket,
+ #if KNOT_VERSION_HEX >= 0x030100
+ ipv6 ? KNOT_XDP_MSG_IPV6 : 0, &out);
+ #else
+ ipv6, &out, NULL);
+ #endif
+ if (ret != KNOT_EOK) {
+ assert(ret == KNOT_ENOMEM);
+ *maxlen = 0;
+ return NULL;
+ }
+ *maxlen = MIN(*maxlen, out.payload.iov_len);
+ /* It's most convenient to fill the MAC addresses at this point. */
+ memcpy(out.eth_from, &ctx->source.eth_addrs[0], 6);
+ memcpy(out.eth_to, &ctx->source.eth_addrs[1], 6);
+ return out.payload.iov_base;
+}
+static void free_wire(const struct request_ctx *ctx)
+{
+ assert(ctx->req.alloc_wire_cb == alloc_wire_cb);
+ knot_pkt_t *ans = ctx->req.answer;
+ if (unlikely(ans == NULL)) /* dropped */
+ return;
+ if (likely(ans->wire == NULL)) /* sent most likely */
+ return;
+ /* We know it's an AF_XDP socket; otherwise alloc_wire_cb isn't assigned. */
+ uv_handle_t *handle = session_get_handle(ctx->source.session);
+ assert(handle->type == UV_POLL);
+ xdp_handle_data_t *xhd = handle->data;
+ /* Freeing is done by sending an empty packet (the API won't really send it). */
+ knot_xdp_msg_t out;
+ out.payload.iov_base = ans->wire;
+ out.payload.iov_len = 0;
+ uint32_t sent;
+ int ret = knot_xdp_send(xhd->socket, &out, 1, &sent);
+ assert(ret == KNOT_EOK && sent == 0); (void)ret;
+ kr_log_verbose("[xdp] freed unsent buffer, ret = %d\n", ret);
+}
+#endif
+/* Helper functions for transport selection */
+static inline bool is_tls_capable(struct sockaddr *address) {
+ tls_client_param_t *tls_entry = tls_client_param_get(the_worker->engine->net.tls_client_params, address);
+ return tls_entry;
+}
+
+static inline bool is_tcp_connected(struct sockaddr *address) {
+ return worker_find_tcp_connected(the_worker, address);
+}
+
+static inline bool is_tcp_waiting(struct sockaddr *address) {
+ return worker_find_tcp_waiting(the_worker, address);
+}
+
+/** Create and initialize a request_ctx (on a fresh mempool).
+ *
+ * session and addr point to the source of the request, and they are NULL
+ * in case the request didn't come from network.
+ */
+static struct request_ctx *request_create(struct worker_ctx *worker,
+ struct session *session,
+ const struct sockaddr *addr,
+ const struct sockaddr *dst_addr,
+ const uint8_t *eth_from,
+ const uint8_t *eth_to,
+ uint32_t uid)
+{
+ knot_mm_t pool = {
+ .ctx = pool_borrow(worker),
+ .alloc = (knot_mm_alloc_t) mp_alloc
+ };
+
+ /* Create request context */
+ struct request_ctx *ctx = mm_calloc(&pool, 1, sizeof(*ctx));
+ if (!ctx) {
+ pool_release(worker, pool.ctx);
+ return NULL;
+ }
+
+ /* TODO Relocate pool to struct request */
+ ctx->worker = worker;
+ if (session) {
+ assert(session_flags(session)->outgoing == false);
+ }
+ ctx->source.session = session;
+ assert(!!eth_to == !!eth_from);
+ const bool is_xdp = eth_to != NULL;
+ if (is_xdp) {
+ #if ENABLE_XDP
+ assert(session);
+ memcpy(&ctx->source.eth_addrs[0], eth_to, sizeof(ctx->source.eth_addrs[0]));
+ memcpy(&ctx->source.eth_addrs[1], eth_from, sizeof(ctx->source.eth_addrs[1]));
+ ctx->req.alloc_wire_cb = alloc_wire_cb;
+ #else
+ assert(!EINVAL);
+ return NULL;
+ #endif
+ }
+
+ struct kr_request *req = &ctx->req;
+ req->pool = pool;
+ req->vars_ref = LUA_NOREF;
+ req->uid = uid;
+ req->qsource.flags.xdp = is_xdp;
+ if (session) {
+ req->qsource.flags.tcp = session_get_handle(session)->type == UV_TCP;
+ req->qsource.flags.tls = session_flags(session)->has_tls;
+ req->qsource.flags.http = session_flags(session)->has_http;
+ req->qsource.stream_id = -1;
+#if ENABLE_DOH2
+ if (req->qsource.flags.http) {
+ struct http_ctx *http_ctx = session_http_get_server_ctx(session);
+ req->qsource.stream_id = queue_head(http_ctx->streams);
+ }
+#endif
+ /* We need to store a copy of peer address. */
+ memcpy(&ctx->source.addr.ip, addr, kr_sockaddr_len(addr));
+ req->qsource.addr = &ctx->source.addr.ip;
+ if (!dst_addr) /* We wouldn't have to copy in this case, but for consistency. */
+ dst_addr = session_get_sockname(session);
+ memcpy(&ctx->source.dst_addr.ip, dst_addr, kr_sockaddr_len(dst_addr));
+ req->qsource.dst_addr = &ctx->source.dst_addr.ip;
+ }
+
+ req->selection_context.is_tls_capable = is_tls_capable;
+ req->selection_context.is_tcp_connected = is_tcp_connected;
+ req->selection_context.is_tcp_waiting = is_tcp_waiting;
+ array_init(req->selection_context.forwarding_targets);
+ array_reserve_mm(req->selection_context.forwarding_targets, 1, kr_memreserve, &req->pool);
+
+ worker->stats.rconcurrent += 1;
+
+ return ctx;
+}
+
+/** More initialization, related to the particular incoming query/packet. */
+static int request_start(struct request_ctx *ctx, knot_pkt_t *query)
+{
+ assert(query && ctx);
+
+ struct kr_request *req = &ctx->req;
+ req->qsource.size = query->size;
+ if (knot_pkt_has_tsig(query)) {
+ req->qsource.size += query->tsig_wire.len;
+ }
+
+ knot_pkt_t *pkt = knot_pkt_new(NULL, req->qsource.size, &req->pool);
+ if (!pkt) {
+ return kr_error(ENOMEM);
+ }
+
+ int ret = knot_pkt_copy(pkt, query);
+ if (ret != KNOT_EOK && ret != KNOT_ETRAIL) {
+ return kr_error(ENOMEM);
+ }
+ req->qsource.packet = pkt;
+
+ /* Start resolution */
+ struct worker_ctx *worker = ctx->worker;
+ struct engine *engine = worker->engine;
+ kr_resolve_begin(req, &engine->resolver);
+ worker->stats.queries += 1;
+ return kr_ok();
+}
+
+static void request_free(struct request_ctx *ctx)
+{
+ struct worker_ctx *worker = ctx->worker;
+ /* Dereference any Lua vars table if exists */
+ if (ctx->req.vars_ref != LUA_NOREF) {
+ lua_State *L = worker->engine->L;
+ /* Get worker variables table */
+ lua_rawgeti(L, LUA_REGISTRYINDEX, worker->vars_table_ref);
+ /* Get next free element (position 0) and store it under current reference (forming a list) */
+ lua_rawgeti(L, -1, 0);
+ lua_rawseti(L, -2, ctx->req.vars_ref);
+ /* Set current reference as the next free element */
+ lua_pushinteger(L, ctx->req.vars_ref);
+ lua_rawseti(L, -2, 0);
+ lua_pop(L, 1);
+ ctx->req.vars_ref = LUA_NOREF;
+ }
+ /* Make sure to free XDP buffer in case it wasn't sent. */
+ if (ctx->req.alloc_wire_cb) {
+ #if ENABLE_XDP
+ free_wire(ctx);
+ #else
+ assert(!EINVAL);
+ #endif
+ }
+ /* Return mempool to ring or free it if it's full */
+ pool_release(worker, ctx->req.pool.ctx);
+ /* @note The 'task' is invalidated from now on. */
+ worker->stats.rconcurrent -= 1;
+}
+
+static struct qr_task *qr_task_create(struct request_ctx *ctx)
+{
+ /* Choose (initial) pktbuf size. As it is now, pktbuf can be used
+ * for UDP answers from upstream *and* from cache
+ * and for sending queries upstream */
+ uint16_t pktbuf_max = KR_EDNS_PAYLOAD;
+ const knot_rrset_t *opt_our = ctx->worker->engine->resolver.upstream_opt_rr;
+ if (opt_our) {
+ pktbuf_max = MAX(pktbuf_max, knot_edns_get_payload(opt_our));
+ }
+
+ /* Create resolution task */
+ struct qr_task *task = mm_calloc(&ctx->req.pool, 1, sizeof(*task));
+ if (!task) {
+ return NULL;
+ }
+
+ /* Create packet buffers for answer and subrequests */
+ knot_pkt_t *pktbuf = knot_pkt_new(NULL, pktbuf_max, &ctx->req.pool);
+ if (!pktbuf) {
+ mm_free(&ctx->req.pool, task);
+ return NULL;
+ }
+ pktbuf->size = 0;
+
+ task->ctx = ctx;
+ task->pktbuf = pktbuf;
+ array_init(task->waiting);
+ task->refs = 0;
+ assert(ctx->task == NULL);
+ ctx->task = task;
+ /* Make the primary reference to task. */
+ qr_task_ref(task);
+ task->creation_time = kr_now();
+ ctx->worker->stats.concurrent += 1;
+ return task;
+}
+
+/* This is called when the task refcount is zero, free memory. */
+static void qr_task_free(struct qr_task *task)
+{
+ struct request_ctx *ctx = task->ctx;
+
+ assert(ctx);
+
+ struct worker_ctx *worker = ctx->worker;
+
+ if (ctx->task == NULL) {
+ request_free(ctx);
+ }
+
+ /* Update stats */
+ worker->stats.concurrent -= 1;
+}
+
+/*@ Register new qr_task within session. */
+static int qr_task_register(struct qr_task *task, struct session *session)
+{
+ assert(!session_flags(session)->outgoing && session_get_handle(session)->type == UV_TCP);
+
+ session_tasklist_add(session, task);
+
+ struct request_ctx *ctx = task->ctx;
+ assert(ctx && (ctx->source.session == NULL || ctx->source.session == session));
+ ctx->source.session = session;
+ /* Soft-limit on parallel queries, there is no "slow down" RCODE
+ * that we could use to signalize to client, but we can stop reading,
+ * an in effect shrink TCP window size. To get more precise throttling,
+ * we would need to copy remainder of the unread buffer and reassemble
+ * when resuming reading. This is NYI. */
+ if (session_tasklist_get_len(session) >= task->ctx->worker->tcp_pipeline_max &&
+ !session_flags(session)->throttled && !session_flags(session)->closing) {
+ session_stop_read(session);
+ session_flags(session)->throttled = true;
+ }
+
+ return 0;
+}
+
+static void qr_task_complete(struct qr_task *task)
+{
+ struct request_ctx *ctx = task->ctx;
+
+ /* Kill pending I/O requests */
+ ioreq_kill_pending(task);
+ assert(task->waiting.len == 0);
+ assert(task->leading == false);
+
+ struct session *s = ctx->source.session;
+ if (s) {
+ assert(!session_flags(s)->outgoing && session_waitinglist_is_empty(s));
+ ctx->source.session = NULL;
+ session_tasklist_del(s, task);
+ }
+
+ /* Release primary reference to task. */
+ if (ctx->task == task) {
+ ctx->task = NULL;
+ qr_task_unref(task);
+ }
+}
+
+/* This is called when we send subrequest / answer */
+int qr_task_on_send(struct qr_task *task, const uv_handle_t *handle, int status)
+{
+ if (task->finished) {
+ assert(task->leading == false);
+ qr_task_complete(task);
+ }
+
+ if (!handle)
+ return status;
+
+ struct session* s = handle->data;
+ assert(s);
+
+ if (handle->type == UV_UDP && session_flags(s)->outgoing) {
+ // This should ensure that we are only dealing with our question to upstream
+ assert(!knot_wire_get_qr(task->pktbuf->wire));
+ // start the timer
+ struct kr_query *qry = array_tail(task->ctx->req.rplan.pending);
+ assert(qry != NULL);
+ (void)qry;
+ size_t timeout = task->transport->timeout;
+ int ret = session_timer_start(s, on_udp_timeout, timeout, 0);
+ /* Start next step with timeout, fatal if can't start a timer. */
+ if (ret != 0) {
+ subreq_finalize(task, &task->transport->address.ip, task->pktbuf);
+ qr_task_finalize(task, KR_STATE_FAIL);
+ }
+ }
+
+ if (handle->type == UV_TCP) {
+ if (status != 0)
+ session_tasklist_del(s, task);
+
+ if (session_flags(s)->outgoing || session_flags(s)->closing)
+ return status;
+
+ struct worker_ctx *worker = task->ctx->worker;
+ if (session_flags(s)->throttled &&
+ session_tasklist_get_len(s) < worker->tcp_pipeline_max/2) {
+ /* Start reading again if the session is throttled and
+ * the number of outgoing requests is below watermark. */
+ session_start_read(s);
+ session_flags(s)->throttled = false;
+ }
+ }
+
+ return status;
+}
+
+static void on_send(uv_udp_send_t *req, int status)
+{
+ struct qr_task *task = req->data;
+ uv_handle_t *h = (uv_handle_t *)req->handle;
+ qr_task_on_send(task, h, status);
+ qr_task_unref(task);
+ free(req);
+}
+
+static void on_write(uv_write_t *req, int status)
+{
+ struct qr_task *task = req->data;
+ uv_handle_t *h = (uv_handle_t *)req->handle;
+ qr_task_on_send(task, h, status);
+ qr_task_unref(task);
+ free(req);
+}
+
+static int qr_task_send(struct qr_task *task, struct session *session,
+ const struct sockaddr *addr, knot_pkt_t *pkt)
+{
+ if (!session) {
+ return qr_task_on_send(task, NULL, kr_error(EIO));
+ }
+
+ int ret = 0;
+ struct request_ctx *ctx = task->ctx;
+
+ uv_handle_t *handle = session_get_handle(session);
+ assert(handle && handle->data == session);
+ const bool is_stream = handle->type == UV_TCP;
+ if (!is_stream && handle->type != UV_UDP) abort();
+
+ if (addr == NULL) {
+ addr = session_get_peer(session);
+ }
+
+ if (pkt == NULL) {
+ pkt = worker_task_get_pktbuf(task);
+ }
+
+ if (session_flags(session)->outgoing && handle->type == UV_TCP) {
+ size_t try_limit = session_tasklist_get_len(session) + 1;
+ uint16_t msg_id = knot_wire_get_id(pkt->wire);
+ size_t try_count = 0;
+ while (session_tasklist_find_msgid(session, msg_id) &&
+ try_count <= try_limit) {
+ ++msg_id;
+ ++try_count;
+ }
+ if (try_count > try_limit) {
+ return kr_error(ENOENT);
+ }
+ worker_task_pkt_set_msgid(task, msg_id);
+ }
+
+ uv_handle_t *ioreq = malloc(is_stream ? sizeof(uv_write_t) : sizeof(uv_udp_send_t));
+ if (!ioreq) {
+ return qr_task_on_send(task, handle, kr_error(ENOMEM));
+ }
+
+ /* Pending ioreq on current task */
+ qr_task_ref(task);
+
+ struct worker_ctx *worker = ctx->worker;
+ /* Note time for upstream RTT */
+ task->send_time = kr_now();
+ task->recv_time = 0; // task structure is being reused so we have to zero this out here
+ /* Send using given protocol */
+ assert(!session_flags(session)->closing);
+ if (session_flags(session)->has_http) {
+#if ENABLE_DOH2
+ uv_write_t *write_req = (uv_write_t *)ioreq;
+ write_req->data = task;
+ ret = http_write(write_req, handle, pkt, ctx->req.qsource.stream_id, &on_write);
+#else
+ ret = kr_error(ENOPROTOOPT);
+#endif
+ } else if (session_flags(session)->has_tls) {
+ uv_write_t *write_req = (uv_write_t *)ioreq;
+ write_req->data = task;
+ ret = tls_write(write_req, handle, pkt, &on_write);
+ } else if (handle->type == UV_UDP) {
+ uv_udp_send_t *send_req = (uv_udp_send_t *)ioreq;
+ uv_buf_t buf = { (char *)pkt->wire, pkt->size };
+ send_req->data = task;
+ ret = uv_udp_send(send_req, (uv_udp_t *)handle, &buf, 1, addr, &on_send);
+ } else if (handle->type == UV_TCP) {
+ uv_write_t *write_req = (uv_write_t *)ioreq;
+ /* We need to write message length in native byte order,
+ * but we don't have a convenient place to store those bytes.
+ * The problem is that all memory referenced from buf[] MUST retain
+ * its contents at least until on_write() is called, and I currently
+ * can't see any convenient place outside the `pkt` structure.
+ * So we use directly the *individual* bytes in pkt->size.
+ * The call to htonl() and the condition will probably be inlinable. */
+ int lsbi, slsbi; /* (second) least significant byte index */
+ if (htonl(1) == 1) { /* big endian */
+ lsbi = sizeof(pkt->size) - 1;
+ slsbi = sizeof(pkt->size) - 2;
+ } else {
+ lsbi = 0;
+ slsbi = 1;
+ }
+ uv_buf_t buf[3] = {
+ { (char *)&pkt->size + slsbi, 1 },
+ { (char *)&pkt->size + lsbi, 1 },
+ { (char *)pkt->wire, pkt->size },
+ };
+ write_req->data = task;
+ ret = uv_write(write_req, (uv_stream_t *)handle, buf, 3, &on_write);
+ } else {
+ assert(false);
+ }
+
+ if (ret == 0) {
+ session_touch(session);
+ if (session_flags(session)->outgoing) {
+ session_tasklist_add(session, task);
+ }
+ if (worker->too_many_open &&
+ worker->stats.rconcurrent <
+ worker->rconcurrent_highwatermark - 10) {
+ worker->too_many_open = false;
+ }
+ } else {
+ free(ioreq);
+ qr_task_unref(task);
+ if (ret == UV_EMFILE) {
+ worker->too_many_open = true;
+ worker->rconcurrent_highwatermark = worker->stats.rconcurrent;
+ ret = kr_error(UV_EMFILE);
+ }
+
+ if (session_flags(session)->has_http)
+ worker->stats.err_http += 1;
+ else if (session_flags(session)->has_tls)
+ worker->stats.err_tls += 1;
+ else if (handle->type == UV_UDP)
+ worker->stats.err_udp += 1;
+ else
+ worker->stats.err_tcp += 1;
+ }
+
+ /* Update outgoing query statistics */
+ if (session_flags(session)->outgoing && addr) {
+ if (session_flags(session)->has_tls)
+ worker->stats.tls += 1;
+ else if (handle->type == UV_UDP)
+ worker->stats.udp += 1;
+ else
+ worker->stats.tcp += 1;
+
+ if (addr->sa_family == AF_INET6)
+ worker->stats.ipv6 += 1;
+ else if (addr->sa_family == AF_INET)
+ worker->stats.ipv4 += 1;
+ }
+ return ret;
+}
+
+static struct kr_query *task_get_last_pending_query(struct qr_task *task)
+{
+ if (!task || task->ctx->req.rplan.pending.len == 0) {
+ return NULL;
+ }
+
+ return array_tail(task->ctx->req.rplan.pending);
+}
+
+static int session_tls_hs_cb(struct session *session, int status)
+{
+ assert(session_flags(session)->outgoing);
+ struct sockaddr *peer = session_get_peer(session);
+ int deletion_res = worker_del_tcp_waiting(the_worker, peer);
+ int ret = kr_ok();
+
+ if (status) {
+ struct qr_task *task = session_waitinglist_get(session);
+ if (task) {
+ // TLS handshake failed, report it to server selection
+ struct kr_query *qry = array_tail(task->ctx->req.rplan.pending);
+ qry->server_selection.error(qry, task->transport, KR_SELECTION_TLS_HANDSHAKE_FAILED);
+ }
+#ifndef NDEBUG
+ else {
+ /* Task isn't in the list of tasks
+ * waiting for connection to upstream.
+ * So that it MUST be unsuccessful rehandshake.
+ * Check it. */
+ assert(deletion_res != 0);
+ const char *key = tcpsess_key(peer);
+ assert(key);
+ assert(map_contains(&the_worker->tcp_connected, key) != 0);
+ }
+#endif
+ return ret;
+ }
+
+ /* handshake was completed successfully */
+ struct tls_client_ctx *tls_client_ctx = session_tls_get_client_ctx(session);
+ tls_client_param_t *tls_params = tls_client_ctx->params;
+ gnutls_session_t tls_session = tls_client_ctx->c.tls_session;
+ if (gnutls_session_is_resumed(tls_session) != 0) {
+ kr_log_verbose("[tls_client] TLS session has resumed\n");
+ } else {
+ kr_log_verbose("[tls_client] TLS session has not resumed\n");
+ /* session wasn't resumed, delete old session data ... */
+ if (tls_params->session_data.data != NULL) {
+ gnutls_free(tls_params->session_data.data);
+ tls_params->session_data.data = NULL;
+ tls_params->session_data.size = 0;
+ }
+ /* ... and get the new session data */
+ gnutls_datum_t tls_session_data = { NULL, 0 };
+ ret = gnutls_session_get_data2(tls_session, &tls_session_data);
+ if (ret == 0) {
+ tls_params->session_data = tls_session_data;
+ }
+ }
+
+ struct session *s = worker_find_tcp_connected(the_worker, peer);
+ ret = kr_ok();
+ if (deletion_res == kr_ok()) {
+ /* peer was in the waiting list, add to the connected list. */
+ if (s) {
+ /* Something went wrong,
+ * peer already is in the connected list. */
+ ret = kr_error(EINVAL);
+ } else {
+ ret = worker_add_tcp_connected(the_worker, peer, session);
+ }
+ } else {
+ /* peer wasn't in the waiting list.
+ * It can be
+ * 1) either successful rehandshake; in this case peer
+ * must be already in the connected list.
+ * 2) or successful handshake with session, which was timeouted
+ * by on_tcp_connect_timeout(); after successful tcp connection;
+ * in this case peer isn't in the connected list.
+ **/
+ if (!s || s != session) {
+ ret = kr_error(EINVAL);
+ }
+ }
+ if (ret == kr_ok()) {
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *t = session_waitinglist_get(session);
+ ret = qr_task_send(t, session, NULL, NULL);
+ if (ret != 0) {
+ break;
+ }
+ session_waitinglist_pop(session, true);
+ }
+ } else {
+ ret = kr_error(EINVAL);
+ }
+
+ if (ret != kr_ok()) {
+ /* Something went wrong.
+ * Either addition to the list of connected sessions
+ * or write to upstream failed. */
+ worker_del_tcp_connected(the_worker, peer);
+ session_waitinglist_finalize(session, KR_STATE_FAIL);
+ session_tasklist_finalize(session, KR_STATE_FAIL);
+ session_close(session);
+ } else {
+ session_timer_stop(session);
+ session_timer_start(session, tcp_timeout_trigger,
+ MAX_TCP_INACTIVITY, MAX_TCP_INACTIVITY);
+ }
+ return kr_ok();
+}
+
+static int send_waiting(struct session *session)
+{
+ int ret = 0;
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *t = session_waitinglist_get(session);
+ ret = qr_task_send(t, session, NULL, NULL);
+ if (ret != 0) {
+ struct worker_ctx *worker = t->ctx->worker;
+ struct sockaddr *peer = session_get_peer(session);
+ session_waitinglist_finalize(session, KR_STATE_FAIL);
+ session_tasklist_finalize(session, KR_STATE_FAIL);
+ worker_del_tcp_connected(worker, peer);
+ session_close(session);
+ break;
+ }
+ session_waitinglist_pop(session, true);
+ }
+ return ret;
+}
+
+static void on_connect(uv_connect_t *req, int status)
+{
+ struct worker_ctx *worker = the_worker;
+ assert(worker);
+ uv_stream_t *handle = req->handle;
+ struct session *session = handle->data;
+ struct sockaddr *peer = session_get_peer(session);
+ free(req);
+
+ assert(session_flags(session)->outgoing);
+
+ if (session_flags(session)->closing) {
+ worker_del_tcp_waiting(worker, peer);
+ assert(session_is_empty(session));
+ return;
+ }
+
+ /* Check if the connection is in the waiting list.
+ * If no, most likely this is timeouted connection
+ * which was removed from waiting list by
+ * on_tcp_connect_timeout() callback. */
+ struct session *s = worker_find_tcp_waiting(worker, peer);
+ if (!s || s != session) {
+ /* session isn't on the waiting list.
+ * it's timeouted session. */
+ if (VERBOSE_STATUS) {
+ const char *peer_str = kr_straddr(peer);
+ kr_log_verbose( "[wrkr]=> connected to '%s', but session "
+ "is already timeouted, close\n",
+ peer_str ? peer_str : "");
+ }
+ assert(session_tasklist_is_empty(session));
+ session_waitinglist_retry(session, false);
+ session_close(session);
+ return;
+ }
+
+ s = worker_find_tcp_connected(worker, peer);
+ if (s) {
+ /* session already in the connected list.
+ * Something went wrong, it can be due to races when kresd has tried
+ * to reconnect to upstream after unsuccessful attempt. */
+ if (VERBOSE_STATUS) {
+ const char *peer_str = kr_straddr(peer);
+ kr_log_verbose( "[wrkr]=> connected to '%s', but peer "
+ "is already connected, close\n",
+ peer_str ? peer_str : "");
+ }
+ assert(session_tasklist_is_empty(session));
+ session_waitinglist_retry(session, false);
+ session_close(session);
+ return;
+ }
+
+ if (status != 0) {
+ if (VERBOSE_STATUS) {
+ const char *peer_str = kr_straddr(peer);
+ kr_log_verbose( "[wrkr]=> connection to '%s' failed (%s), flagged as 'bad'\n",
+ peer_str ? peer_str : "", uv_strerror(status));
+ }
+ worker_del_tcp_waiting(worker, peer);
+ struct qr_task *task = session_waitinglist_get(session);
+ if (task && status != UV_ETIMEDOUT) {
+ /* Penalize upstream.
+ * In case of UV_ETIMEDOUT upstream has been
+ * already penalized in on_tcp_connect_timeout() */
+ struct kr_query *qry = array_tail(task->ctx->req.rplan.pending);
+ qry->server_selection.error(qry, task->transport, KR_SELECTION_TCP_CONNECT_FAILED);
+ }
+ assert(session_tasklist_is_empty(session));
+ session_waitinglist_retry(session, false);
+ session_close(session);
+ return;
+ }
+
+ if (!session_flags(session)->has_tls) {
+ /* if there is a TLS, session still waiting for handshake,
+ * otherwise remove it from waiting list */
+ if (worker_del_tcp_waiting(worker, peer) != 0) {
+ /* session isn't in list of waiting queries, *
+ * something gone wrong */
+ session_waitinglist_finalize(session, KR_STATE_FAIL);
+ assert(session_tasklist_is_empty(session));
+ session_close(session);
+ return;
+ }
+ }
+
+ if (VERBOSE_STATUS) {
+ const char *peer_str = kr_straddr(peer);
+ kr_log_verbose( "[wrkr]=> connected to '%s'\n", peer_str ? peer_str : "");
+ }
+
+ session_flags(session)->connected = true;
+ session_start_read(session);
+
+ int ret = kr_ok();
+ if (session_flags(session)->has_tls) {
+ struct tls_client_ctx *tls_ctx = session_tls_get_client_ctx(session);
+ ret = tls_client_connect_start(tls_ctx, session, session_tls_hs_cb);
+ if (ret == kr_error(EAGAIN)) {
+ session_timer_stop(session);
+ session_timer_start(session, tcp_timeout_trigger,
+ MAX_TCP_INACTIVITY, MAX_TCP_INACTIVITY);
+ return;
+ }
+ } else {
+ worker_add_tcp_connected(worker, peer, session);
+ }
+
+ ret = send_waiting(session);
+ if (ret != 0) {
+ return;
+ }
+
+ session_timer_stop(session);
+ session_timer_start(session, tcp_timeout_trigger,
+ MAX_TCP_INACTIVITY, MAX_TCP_INACTIVITY);
+}
+
+static void on_tcp_connect_timeout(uv_timer_t *timer)
+{
+ struct session *session = timer->data;
+
+ uv_timer_stop(timer);
+ struct worker_ctx *worker = the_worker;
+ assert(worker);
+
+ assert (session_tasklist_is_empty(session));
+
+ struct sockaddr *peer = session_get_peer(session);
+ worker_del_tcp_waiting(worker, peer);
+
+ struct qr_task *task = session_waitinglist_get(session);
+ if (!task) {
+ /* Normally shouldn't happen. */
+ const char *peer_str = kr_straddr(peer);
+ VERBOSE_MSG(NULL, "=> connection to '%s' failed (internal timeout), empty waitinglist\n",
+ peer_str ? peer_str : "");
+ return;
+ }
+
+ struct kr_query *qry = task_get_last_pending_query(task);
+ WITH_VERBOSE (qry) {
+ const char *peer_str = kr_straddr(peer);
+ VERBOSE_MSG(qry, "=> connection to '%s' failed (internal timeout)\n",
+ peer_str ? peer_str : "");
+ }
+
+ qry->server_selection.error(qry, task->transport, KR_SELECTION_TCP_CONNECT_TIMEOUT);
+
+ worker->stats.timeout += session_waitinglist_get_len(session);
+ session_waitinglist_retry(session, true);
+ assert (session_tasklist_is_empty(session));
+ /* uv_cancel() doesn't support uv_connect_t request,
+ * so that we can't cancel it.
+ * There still exists possibility of successful connection
+ * for this request.
+ * So connection callback (on_connect()) must check
+ * if connection is in the list of waiting connection.
+ * If no, most likely this is timeouted connection even if
+ * it was successful. */
+}
+
+/* This is called when I/O timeouts */
+static void on_udp_timeout(uv_timer_t *timer)
+{
+ struct session *session = timer->data;
+ assert(session_get_handle(session)->data == session);
+ assert(session_tasklist_get_len(session) == 1);
+ assert(session_waitinglist_is_empty(session));
+
+ uv_timer_stop(timer);
+
+ struct qr_task *task = session_tasklist_get_first(session);
+ struct worker_ctx *worker = task->ctx->worker;
+
+ if (task->leading && task->pending_count > 0) {
+ struct kr_query *qry = array_tail(task->ctx->req.rplan.pending);
+ qry->server_selection.error(qry, task->transport, KR_SELECTION_QUERY_TIMEOUT);
+ }
+
+ task->timeouts += 1;
+ worker->stats.timeout += 1;
+ qr_task_step(task, NULL, NULL);
+}
+
+static uv_handle_t *transmit(struct qr_task *task)
+{
+ uv_handle_t *ret = NULL;
+
+ if (task) {
+ struct kr_transport* transport = task->transport;
+
+ struct sockaddr_in6 *choice = (struct sockaddr_in6 *)&transport->address;
+
+ if (!choice) {
+ return ret;
+ }
+ if (task->pending_count >= MAX_PENDING) {
+ return ret;
+ }
+ /* Checkout answer before sending it */
+ struct request_ctx *ctx = task->ctx;
+ if (kr_resolve_checkout(&ctx->req, NULL, transport, task->pktbuf) != 0) {
+ return ret;
+ }
+ ret = ioreq_spawn(ctx->worker, SOCK_DGRAM, choice->sin6_family, false, false);
+ if (!ret) {
+ return ret;
+ }
+ struct sockaddr *addr = (struct sockaddr *)choice;
+ struct session *session = ret->data;
+ struct sockaddr *peer = session_get_peer(session);
+ assert (peer->sa_family == AF_UNSPEC && session_flags(session)->outgoing);
+ memcpy(peer, addr, kr_sockaddr_len(addr));
+ if (qr_task_send(task, session, (struct sockaddr *)choice,
+ task->pktbuf) != 0) {
+ session_close(session);
+ ret = NULL;
+ } else {
+ task->pending[task->pending_count] = session;
+ task->pending_count += 1;
+ session_start_read(session); /* Start reading answer */
+ }
+ }
+ return ret;
+}
+
+
+static void subreq_finalize(struct qr_task *task, const struct sockaddr *packet_source, knot_pkt_t *pkt)
+{
+ if (!task || task->finished) {
+ return;
+ }
+ /* Close pending timer */
+ ioreq_kill_pending(task);
+ /* Clear from outgoing table. */
+ if (!task->leading)
+ return;
+ char key[SUBREQ_KEY_LEN];
+ const int klen = subreq_key(key, task->pktbuf);
+ if (klen > 0) {
+ void *val_deleted;
+ int ret = trie_del(task->ctx->worker->subreq_out, key, klen, &val_deleted);
+ assert(ret == KNOT_EOK && val_deleted == task); (void)ret;
+ }
+ /* Notify waiting tasks. */
+ struct kr_query *leader_qry = array_tail(task->ctx->req.rplan.pending);
+ for (size_t i = task->waiting.len; i > 0; i--) {
+ struct qr_task *follower = task->waiting.at[i - 1];
+ /* Reuse MSGID and 0x20 secret */
+ if (follower->ctx->req.rplan.pending.len > 0) {
+ struct kr_query *qry = array_tail(follower->ctx->req.rplan.pending);
+ qry->id = leader_qry->id;
+ qry->secret = leader_qry->secret;
+
+ // Note that this transport may not be present in `leader_qry`'s server selection
+ follower->transport = task->transport;
+ if(follower->transport) {
+ follower->transport->deduplicated = true;
+ }
+ leader_qry->secret = 0; /* Next will be already decoded */
+ }
+ qr_task_step(follower, packet_source, pkt);
+ qr_task_unref(follower);
+ }
+ task->waiting.len = 0;
+ task->leading = false;
+}
+
+static void subreq_lead(struct qr_task *task)
+{
+ assert(task);
+ char key[SUBREQ_KEY_LEN];
+ const int klen = subreq_key(key, task->pktbuf);
+ if (klen < 0)
+ return;
+ struct qr_task **tvp = (struct qr_task **)
+ trie_get_ins(task->ctx->worker->subreq_out, key, klen);
+ if (unlikely(!tvp))
+ return; /*ENOMEM*/
+ if (unlikely(*tvp != NULL)) {
+ assert(false);
+ return;
+ }
+ *tvp = task;
+ task->leading = true;
+}
+
+static bool subreq_enqueue(struct qr_task *task)
+{
+ assert(task);
+ char key[SUBREQ_KEY_LEN];
+ const int klen = subreq_key(key, task->pktbuf);
+ if (klen < 0)
+ return false;
+ struct qr_task **leader = (struct qr_task **)
+ trie_get_try(task->ctx->worker->subreq_out, key, klen);
+ if (!leader /*ENOMEM*/ || !*leader)
+ return false;
+ /* Enqueue itself to leader for this subrequest. */
+ int ret = array_push_mm((*leader)->waiting, task,
+ kr_memreserve, &(*leader)->ctx->req.pool);
+ if (unlikely(ret < 0)) /*ENOMEM*/
+ return false;
+ qr_task_ref(task);
+ return true;
+}
+
+#if ENABLE_XDP
+static void xdp_tx_waker(uv_idle_t *handle)
+{
+ int ret = knot_xdp_send_finish(handle->data);
+ if (ret != KNOT_EAGAIN && ret != KNOT_EOK)
+ kr_log_error("[xdp] check: ret = %d, %s\n", ret, knot_strerror(ret));
+ /* Apparently some drivers need many explicit wake-up calls
+ * even if we push no additional packets (in case they accumulated a lot) */
+ if (ret != KNOT_EAGAIN)
+ uv_idle_stop(handle);
+ knot_xdp_send_prepare(handle->data);
+ /* LATER(opt.): it _might_ be better for performance to do these two steps
+ * at different points in time */
+}
+#endif
+/** Send an answer packet over XDP. */
+static int xdp_push(struct qr_task *task, const uv_handle_t *src_handle)
+{
+#if ENABLE_XDP
+ struct request_ctx *ctx = task->ctx;
+ knot_xdp_msg_t msg;
+ const struct sockaddr *ip_from = &ctx->source.dst_addr.ip;
+ const struct sockaddr *ip_to = &ctx->source.addr.ip;
+ memcpy(&msg.ip_from, ip_from, kr_sockaddr_len(ip_from));
+ memcpy(&msg.ip_to, ip_to, kr_sockaddr_len(ip_to));
+ msg.payload.iov_base = ctx->req.answer->wire;
+ msg.payload.iov_len = ctx->req.answer->size;
+
+ xdp_handle_data_t *xhd = src_handle->data;
+ assert(xhd && xhd->socket && xhd->session == ctx->source.session);
+ uint32_t sent;
+ int ret = knot_xdp_send(xhd->socket, &msg, 1, &sent);
+ ctx->req.answer->wire = NULL; /* it's been freed */
+
+ uv_idle_start(&xhd->tx_waker, xdp_tx_waker);
+ kr_log_verbose("[xdp] pushed a packet, ret = %d\n", ret);
+
+ return qr_task_on_send(task, src_handle, ret);
+#else
+ assert(!EINVAL);
+ return kr_error(EINVAL);
+#endif
+}
+
+static int qr_task_finalize(struct qr_task *task, int state)
+{
+ assert(task && task->leading == false);
+ if (task->finished) {
+ return kr_ok();
+ }
+ struct request_ctx *ctx = task->ctx;
+ struct session *source_session = ctx->source.session;
+ kr_resolve_finish(&ctx->req, state);
+
+ task->finished = true;
+ if (source_session == NULL) {
+ (void) qr_task_on_send(task, NULL, kr_error(EIO));
+ return state == KR_STATE_DONE ? kr_ok() : kr_error(EIO);
+ }
+
+ if (unlikely(ctx->req.answer == NULL)) { /* meant to be dropped */
+ (void) qr_task_on_send(task, NULL, kr_ok());
+ return kr_ok();
+ }
+
+ if (session_flags(source_session)->closing ||
+ ctx->source.addr.ip.sa_family == AF_UNSPEC)
+ return kr_error(EINVAL);
+
+ /* Reference task as the callback handler can close it */
+ qr_task_ref(task);
+
+ /* Send back answer */
+ int ret;
+ const uv_handle_t *src_handle = session_get_handle(source_session);
+ if (src_handle->type != UV_UDP && src_handle->type != UV_TCP
+ && src_handle->type != UV_POLL) {
+ assert(false);
+ ret = kr_error(EINVAL);
+
+ } else if (src_handle->type == UV_POLL) {
+ ret = xdp_push(task, src_handle);
+
+ } else if (src_handle->type == UV_UDP && ENABLE_SENDMMSG) {
+ int fd;
+ ret = uv_fileno(src_handle, &fd);
+ assert(!ret);
+ if (ret == 0) {
+ udp_queue_push(fd, &ctx->req, task);
+ }
+ } else {
+ ret = qr_task_send(task, source_session, &ctx->source.addr.ip, ctx->req.answer);
+ }
+
+ if (ret != kr_ok()) {
+ (void) qr_task_on_send(task, NULL, kr_error(EIO));
+ /* Since source session is erroneous detach all tasks. */
+ while (!session_tasklist_is_empty(source_session)) {
+ struct qr_task *t = session_tasklist_del_first(source_session, false);
+ struct request_ctx *c = t->ctx;
+ assert(c->source.session == source_session);
+ c->source.session = NULL;
+ /* Don't finalize them as there can be other tasks
+ * waiting for answer to this particular task.
+ * (ie. task->leading is true) */
+ worker_task_unref(t);
+ }
+ session_close(source_session);
+ }
+
+ qr_task_unref(task);
+
+ if (ret != kr_ok() || state != KR_STATE_DONE)
+ return kr_error(EIO);
+ return kr_ok();
+}
+
+static int udp_task_step(struct qr_task *task,
+ const struct sockaddr *packet_source, knot_pkt_t *packet)
+{
+ /* If there is already outgoing query, enqueue to it. */
+ if (subreq_enqueue(task)) {
+ return kr_ok(); /* Will be notified when outgoing query finishes. */
+ }
+ /* Start transmitting */
+ uv_handle_t *handle = transmit(task);
+ if (handle == NULL) {
+ subreq_finalize(task, packet_source, packet);
+ return qr_task_finalize(task, KR_STATE_FAIL);
+ }
+
+ /* Announce and start subrequest.
+ * @note Only UDP can lead I/O as it doesn't touch 'task->pktbuf' for reassembly.
+ */
+ subreq_lead(task);
+
+ return kr_ok();
+}
+
+static int tcp_task_waiting_connection(struct session *session, struct qr_task *task)
+{
+ assert(session_flags(session)->outgoing);
+ if (session_flags(session)->closing) {
+ /* Something went wrong. Better answer with KR_STATE_FAIL.
+ * TODO: normally should not happen,
+ * consider possibility to transform this into
+ * assert(!session_flags(session)->closing). */
+ return kr_error(EINVAL);
+ }
+ /* Add task to the end of list of waiting tasks.
+ * It will be notified in on_connect() or qr_task_on_send(). */
+ int ret = session_waitinglist_push(session, task);
+ if (ret < 0) {
+ return kr_error(EINVAL);
+ }
+ return kr_ok();
+}
+
+static int tcp_task_existing_connection(struct session *session, struct qr_task *task)
+{
+ assert(session_flags(session)->outgoing);
+ struct request_ctx *ctx = task->ctx;
+ struct worker_ctx *worker = ctx->worker;
+
+ if (session_flags(session)->closing) {
+ /* Something went wrong. Better answer with KR_STATE_FAIL.
+ * TODO: normally should not happen,
+ * consider possibility to transform this into
+ * assert(!session_flags(session)->closing). */
+ return kr_error(EINVAL);
+ }
+
+ /* If there are any unsent queries, send it first. */
+ int ret = send_waiting(session);
+ if (ret != 0) {
+ return kr_error(EINVAL);
+ }
+
+ /* No unsent queries at that point. */
+ if (session_tasklist_get_len(session) >= worker->tcp_pipeline_max) {
+ /* Too many outstanding queries, answer with SERFVAIL, */
+ return kr_error(EINVAL);
+ }
+
+ /* Send query to upstream. */
+ ret = qr_task_send(task, session, NULL, NULL);
+ if (ret != 0) {
+ /* Error, finalize task with SERVFAIL and
+ * close connection to upstream. */
+ session_tasklist_finalize(session, KR_STATE_FAIL);
+ worker_del_tcp_connected(worker, session_get_peer(session));
+ session_close(session);
+ return kr_error(EINVAL);
+ }
+
+ return kr_ok();
+}
+
+static int tcp_task_make_connection(struct qr_task *task, const struct sockaddr *addr)
+{
+ struct request_ctx *ctx = task->ctx;
+ struct worker_ctx *worker = ctx->worker;
+
+ /* Check if there must be TLS */
+ struct tls_client_ctx *tls_ctx = NULL;
+ struct network *net = &worker->engine->net;
+ tls_client_param_t *entry = tls_client_param_get(net->tls_client_params, addr);
+ if (entry) {
+ /* Address is configured to be used with TLS.
+ * We need to allocate auxiliary data structure. */
+ tls_ctx = tls_client_ctx_new(entry, worker);
+ if (!tls_ctx) {
+ return kr_error(EINVAL);
+ }
+ }
+
+ uv_connect_t *conn = malloc(sizeof(uv_connect_t));
+ if (!conn) {
+ tls_client_ctx_free(tls_ctx);
+ return kr_error(EINVAL);
+ }
+ bool has_http = false;
+ bool has_tls = (tls_ctx != NULL);
+ uv_handle_t *client = ioreq_spawn(worker, SOCK_STREAM, addr->sa_family, has_tls, has_http);
+ if (!client) {
+ tls_client_ctx_free(tls_ctx);
+ free(conn);
+ return kr_error(EINVAL);
+ }
+ struct session *session = client->data;
+ assert(session_flags(session)->has_tls == has_tls);
+ if (has_tls) {
+ tls_client_ctx_set_session(tls_ctx, session);
+ session_tls_set_client_ctx(session, tls_ctx);
+ }
+
+ /* Add address to the waiting list.
+ * Now it "is waiting to be connected to." */
+ int ret = worker_add_tcp_waiting(worker, addr, session);
+ if (ret < 0) {
+ free(conn);
+ session_close(session);
+ return kr_error(EINVAL);
+ }
+
+ conn->data = session;
+ /* Store peer address for the session. */
+ struct sockaddr *peer = session_get_peer(session);
+ memcpy(peer, addr, kr_sockaddr_len(addr));
+
+ /* Start watchdog to catch eventual connection timeout. */
+ ret = session_timer_start(session, on_tcp_connect_timeout,
+ KR_CONN_RTT_MAX, 0);
+ if (ret != 0) {
+ worker_del_tcp_waiting(worker, addr);
+ free(conn);
+ session_close(session);
+ return kr_error(EINVAL);
+ }
+
+ struct kr_query *qry = task_get_last_pending_query(task);
+ WITH_VERBOSE (qry) {
+ const char *peer_str = kr_straddr(peer);
+ VERBOSE_MSG(qry, "=> connecting to: '%s'\n", peer_str ? peer_str : "");
+ }
+
+ /* Start connection process to upstream. */
+ ret = uv_tcp_connect(conn, (uv_tcp_t *)client, addr , on_connect);
+ if (ret != 0) {
+ session_timer_stop(session);
+ worker_del_tcp_waiting(worker, addr);
+ free(conn);
+ session_close(session);
+ qry->server_selection.error(qry, task->transport, KR_SELECTION_TCP_CONNECT_FAILED);
+ return kr_error(EAGAIN);
+ }
+
+ /* Add task to the end of list of waiting tasks.
+ * Will be notified either in on_connect() or in qr_task_on_send(). */
+ ret = session_waitinglist_push(session, task);
+ if (ret < 0) {
+ session_timer_stop(session);
+ worker_del_tcp_waiting(worker, addr);
+ free(conn);
+ session_close(session);
+ return kr_error(EINVAL);
+ }
+
+ return kr_ok();
+}
+
+static int tcp_task_step(struct qr_task *task,
+ const struct sockaddr *packet_source, knot_pkt_t *packet)
+{
+ assert(task->pending_count == 0);
+
+ /* target */
+ const struct sockaddr *addr = &task->transport->address.ip;
+ if (addr->sa_family == AF_UNSPEC) {
+ /* Target isn't defined. Finalize task with SERVFAIL.
+ * Although task->pending_count is zero, there are can be followers,
+ * so we need to call subreq_finalize() to handle them properly. */
+ subreq_finalize(task, packet_source, packet);
+ return qr_task_finalize(task, KR_STATE_FAIL);
+ }
+ /* Checkout task before connecting */
+ struct request_ctx *ctx = task->ctx;
+ if (kr_resolve_checkout(&ctx->req, NULL, task->transport, task->pktbuf) != 0) {
+ subreq_finalize(task, packet_source, packet);
+ return qr_task_finalize(task, KR_STATE_FAIL);
+ }
+ int ret;
+ struct session* session = NULL;
+ if ((session = worker_find_tcp_waiting(ctx->worker, addr)) != NULL) {
+ /* Connection is in the list of waiting connections.
+ * It means that connection establishing is coming right now. */
+ ret = tcp_task_waiting_connection(session, task);
+ } else if ((session = worker_find_tcp_connected(ctx->worker, addr)) != NULL) {
+ /* Connection has been already established. */
+ ret = tcp_task_existing_connection(session, task);
+ } else {
+ /* Make connection. */
+ ret = tcp_task_make_connection(task, addr);
+ }
+
+ if (ret != kr_ok()) {
+ subreq_finalize(task, addr, packet);
+ if (ret == kr_error(EAGAIN)) {
+ ret = qr_task_step(task, addr, NULL);
+ } else {
+ ret = qr_task_finalize(task, KR_STATE_FAIL);
+ }
+ }
+
+ return ret;
+}
+
+static int qr_task_step(struct qr_task *task,
+ const struct sockaddr *packet_source, knot_pkt_t *packet)
+{
+ /* No more steps after we're finished. */
+ if (!task || task->finished) {
+ return kr_error(ESTALE);
+ }
+
+ /* Close pending I/O requests */
+ subreq_finalize(task, packet_source, packet);
+ if ((kr_now() - worker_task_creation_time(task)) >= KR_RESOLVE_TIME_LIMIT) {
+ return qr_task_finalize(task, KR_STATE_FAIL);
+ }
+
+ /* Consume input and produce next query */
+ struct request_ctx *ctx = task->ctx;
+ assert(ctx);
+ struct kr_request *req = &ctx->req;
+ struct worker_ctx *worker = ctx->worker;
+
+ if (worker->too_many_open) {
+ /* */
+ struct kr_rplan *rplan = &req->rplan;
+ if (worker->stats.rconcurrent <
+ worker->rconcurrent_highwatermark - 10) {
+ worker->too_many_open = false;
+ } else {
+ if (packet && kr_rplan_empty(rplan)) {
+ /* new query; TODO - make this detection more obvious */
+ kr_resolve_consume(req, &task->transport, packet);
+ }
+ return qr_task_finalize(task, KR_STATE_FAIL);
+ }
+ }
+
+ // Report network RTT back to server selection
+ if (packet && task->send_time && task->recv_time) {
+ struct kr_query *qry = array_tail(req->rplan.pending);
+ qry->server_selection.update_rtt(qry, task->transport, task->recv_time - task->send_time);
+ }
+
+ int state = kr_resolve_consume(req, &task->transport, packet);
+
+ task->transport = NULL;
+ while (state == KR_STATE_PRODUCE) {
+ state = kr_resolve_produce(req, &task->transport, task->pktbuf);
+ if (unlikely(++task->iter_count > KR_ITER_LIMIT ||
+ task->timeouts >= KR_TIMEOUT_LIMIT)) {
+
+ #ifndef NOVERBOSELOG
+ struct kr_rplan *rplan = &req->rplan;
+ struct kr_query *last = kr_rplan_last(rplan);
+ if (task->iter_count > KR_ITER_LIMIT) {
+ VERBOSE_MSG(last, "canceling query due to exceeded iteration count limit of %d\n", KR_ITER_LIMIT);
+ }
+ if (task->timeouts >= KR_TIMEOUT_LIMIT) {
+ VERBOSE_MSG(last, "canceling query due to exceeded timeout retries limit of %d\n", KR_TIMEOUT_LIMIT);
+ }
+ #endif
+
+ return qr_task_finalize(task, KR_STATE_FAIL);
+ }
+ }
+
+ /* We're done, no more iterations needed */
+ if (state & (KR_STATE_DONE|KR_STATE_FAIL)) {
+ return qr_task_finalize(task, state);
+ } else if (!task->transport || !task->transport->protocol) {
+ return qr_task_step(task, NULL, NULL);
+ }
+
+ switch (task->transport->protocol)
+ {
+ case KR_TRANSPORT_UDP:
+ return udp_task_step(task, packet_source, packet);
+ case KR_TRANSPORT_TCP: // fall through
+ case KR_TRANSPORT_TLS:
+ return tcp_task_step(task, packet_source, packet);
+ default:
+ assert(0);
+ return kr_error(EINVAL);
+ }
+}
+
+static int parse_packet(knot_pkt_t *query)
+{
+ if (!query){
+ return kr_error(EINVAL);
+ }
+
+ /* Parse query packet. */
+ int ret = knot_pkt_parse(query, 0);
+ if (ret == KNOT_ETRAIL) {
+ /* Extra data after message end. */
+ ret = kr_error(EMSGSIZE);
+ } else if (ret != KNOT_EOK) {
+ /* Malformed query. */
+ ret = kr_error(EPROTO);
+ } else {
+ ret = kr_ok();
+ }
+
+ return ret;
+}
+
+int worker_submit(struct session *session,
+ const struct sockaddr *peer, const struct sockaddr *dst_addr,
+ const uint8_t *eth_from, const uint8_t *eth_to, knot_pkt_t *pkt)
+{
+ if (!session || !pkt)
+ return kr_error(EINVAL);
+
+ uv_handle_t *handle = session_get_handle(session);
+ if (!handle || !handle->loop->data)
+ return kr_error(EINVAL);
+
+ int ret = parse_packet(pkt);
+
+ const bool is_query = (knot_wire_get_qr(pkt->wire) == 0);
+ const bool is_outgoing = session_flags(session)->outgoing;
+
+ struct http_ctx *http_ctx = NULL;
+#if ENABLE_DOH2
+ http_ctx = session_http_get_server_ctx(session);
+#endif
+
+ if (!is_outgoing && http_ctx && queue_len(http_ctx->streams) <= 0)
+ return kr_error(ENOENT);
+
+ /* Ignore badly formed queries. */
+ if ((ret != kr_ok() && ret != kr_error(EMSGSIZE)) ||
+ (is_query == is_outgoing)) {
+ if (!is_outgoing) {
+ the_worker->stats.dropped += 1;
+ if (http_ctx)
+ queue_pop(http_ctx->streams);
+ }
+ return kr_error(EILSEQ);
+ }
+
+ /* Start new task on listening sockets,
+ * or resume if this is subrequest */
+ struct qr_task *task = NULL;
+ const struct sockaddr *addr = NULL;
+ if (!is_outgoing) { /* request from a client */
+ struct request_ctx *ctx =
+ request_create(the_worker, session, peer, dst_addr,
+ eth_from, eth_to, knot_wire_get_id(pkt->wire));
+ if (http_ctx)
+ queue_pop(http_ctx->streams);
+ if (!ctx)
+ return kr_error(ENOMEM);
+
+ ret = request_start(ctx, pkt);
+ if (ret != 0) {
+ request_free(ctx);
+ return kr_error(ENOMEM);
+ }
+
+ task = qr_task_create(ctx);
+ if (!task) {
+ request_free(ctx);
+ return kr_error(ENOMEM);
+ }
+
+ if (handle->type == UV_TCP && qr_task_register(task, session)) {
+ return kr_error(ENOMEM);
+ }
+ } else { /* response from upstream */
+ const uint16_t id = knot_wire_get_id(pkt->wire);
+ task = session_tasklist_del_msgid(session, id);
+ if (task == NULL) {
+ VERBOSE_MSG(NULL, "=> ignoring packet with mismatching ID %d\n",
+ (int)id);
+ return kr_error(ENOENT);
+ }
+ assert(!session_flags(session)->closing);
+ addr = peer;
+ /* Note recieve time for RTT calculation */
+ task->recv_time = kr_now();
+ }
+ assert(uv_is_closing(session_get_handle(session)) == false);
+
+ /* Packet was successfully parsed.
+ * Task was created (found). */
+ session_touch(session);
+
+ /* Consume input and produce next message */
+ return qr_task_step(task, addr, pkt);
+}
+
+static int map_add_tcp_session(map_t *map, const struct sockaddr* addr,
+ struct session *session)
+{
+ assert(map && addr);
+ const char *key = tcpsess_key(addr);
+ assert(key);
+ assert(map_contains(map, key) == 0);
+ int ret = map_set(map, key, session);
+ return ret ? kr_error(EINVAL) : kr_ok();
+}
+
+static int map_del_tcp_session(map_t *map, const struct sockaddr* addr)
+{
+ assert(map && addr);
+ const char *key = tcpsess_key(addr);
+ assert(key);
+ int ret = map_del(map, key);
+ return ret ? kr_error(ENOENT) : kr_ok();
+}
+
+static struct session* map_find_tcp_session(map_t *map,
+ const struct sockaddr *addr)
+{
+ assert(map && addr);
+ const char *key = tcpsess_key(addr);
+ assert(key);
+ struct session* ret = map_get(map, key);
+ return ret;
+}
+
+int worker_add_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr* addr,
+ struct session *session)
+{
+#ifndef NDEBUG
+ assert(addr);
+ const char *key = tcpsess_key(addr);
+ assert(key);
+ assert(map_contains(&worker->tcp_connected, key) == 0);
+#endif
+ return map_add_tcp_session(&worker->tcp_connected, addr, session);
+}
+
+int worker_del_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr* addr)
+{
+ assert(addr && tcpsess_key(addr));
+ return map_del_tcp_session(&worker->tcp_connected, addr);
+}
+
+struct session* worker_find_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr* addr)
+{
+ return map_find_tcp_session(&worker->tcp_connected, addr);
+}
+
+static int worker_add_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr* addr,
+ struct session *session)
+{
+#ifndef NDEBUG
+ assert(addr);
+ const char *key = tcpsess_key(addr);
+ assert(key);
+ assert(map_contains(&worker->tcp_waiting, key) == 0);
+#endif
+ return map_add_tcp_session(&worker->tcp_waiting, addr, session);
+}
+
+int worker_del_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr* addr)
+{
+ assert(addr && tcpsess_key(addr));
+ return map_del_tcp_session(&worker->tcp_waiting, addr);
+}
+
+struct session* worker_find_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr* addr)
+{
+ return map_find_tcp_session(&worker->tcp_waiting, addr);
+}
+
+int worker_end_tcp(struct session *session)
+{
+ if (!session) {
+ return kr_error(EINVAL);
+ }
+
+ session_timer_stop(session);
+
+ struct sockaddr *peer = session_get_peer(session);
+
+ worker_del_tcp_waiting(the_worker, peer);
+ worker_del_tcp_connected(the_worker, peer);
+ session_flags(session)->connected = false;
+
+ struct tls_client_ctx *tls_client_ctx = session_tls_get_client_ctx(session);
+ if (tls_client_ctx) {
+ /* Avoid gnutls_bye() call */
+ tls_set_hs_state(&tls_client_ctx->c, TLS_HS_NOT_STARTED);
+ }
+
+ struct tls_ctx *tls_ctx = session_tls_get_server_ctx(session);
+ if (tls_ctx) {
+ /* Avoid gnutls_bye() call */
+ tls_set_hs_state(&tls_ctx->c, TLS_HS_NOT_STARTED);
+ }
+
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *task = session_waitinglist_pop(session, false);
+ assert(task->refs > 1);
+ session_tasklist_del(session, task);
+ if (session_flags(session)->outgoing) {
+ if (task->ctx->req.options.FORWARD) {
+ /* We are in TCP_FORWARD mode.
+ * To prevent failing at kr_resolve_consume()
+ * qry.flags.TCP must be cleared.
+ * TODO - refactoring is needed. */
+ struct kr_request *req = &task->ctx->req;
+ struct kr_rplan *rplan = &req->rplan;
+ struct kr_query *qry = array_tail(rplan->pending);
+ qry->flags.TCP = false;
+ }
+ qr_task_step(task, NULL, NULL);
+ } else {
+ assert(task->ctx->source.session == session);
+ task->ctx->source.session = NULL;
+ }
+ worker_task_unref(task);
+ }
+ while (!session_tasklist_is_empty(session)) {
+ struct qr_task *task = session_tasklist_del_first(session, false);
+ if (session_flags(session)->outgoing) {
+ if (task->ctx->req.options.FORWARD) {
+ struct kr_request *req = &task->ctx->req;
+ struct kr_rplan *rplan = &req->rplan;
+ struct kr_query *qry = array_tail(rplan->pending);
+ qry->flags.TCP = false;
+ }
+ qr_task_step(task, NULL, NULL);
+ } else {
+ assert(task->ctx->source.session == session);
+ task->ctx->source.session = NULL;
+ }
+ worker_task_unref(task);
+ }
+ session_close(session);
+ return kr_ok();
+}
+
+knot_pkt_t *worker_resolve_mk_pkt_dname(knot_dname_t *qname, uint16_t qtype, uint16_t qclass,
+ const struct kr_qflags *options)
+{
+ knot_pkt_t *pkt = knot_pkt_new(NULL, KNOT_EDNS_MAX_UDP_PAYLOAD, NULL);
+ if (!pkt)
+ return NULL;
+ knot_pkt_put_question(pkt, qname, qclass, qtype);
+ knot_wire_set_rd(pkt->wire);
+ knot_wire_set_ad(pkt->wire);
+
+ /* Add OPT RR, including wire format so modules can see both representations.
+ * knot_pkt_put() copies the outside; we need to duplicate the inside manually. */
+ knot_rrset_t *opt = knot_rrset_copy(the_worker->engine->resolver.downstream_opt_rr, NULL);
+ if (!opt) {
+ knot_pkt_free(pkt);
+ return NULL;
+ }
+ if (options->DNSSEC_WANT) {
+ knot_edns_set_do(opt);
+ }
+ knot_pkt_begin(pkt, KNOT_ADDITIONAL);
+ int ret = knot_pkt_put(pkt, KNOT_COMPR_HINT_NONE, opt, KNOT_PF_FREE);
+ if (ret == KNOT_EOK) {
+ free(opt); /* inside is owned by pkt now */
+ } else {
+ knot_rrset_free(opt, NULL);
+ knot_pkt_free(pkt);
+ return NULL;
+ }
+
+ if (options->DNSSEC_CD) {
+ knot_wire_set_cd(pkt->wire);
+ }
+
+ return pkt;
+}
+
+knot_pkt_t *worker_resolve_mk_pkt(const char *qname_str, uint16_t qtype, uint16_t qclass,
+ const struct kr_qflags *options)
+{
+ uint8_t qname[KNOT_DNAME_MAXLEN];
+ if (!knot_dname_from_str(qname, qname_str, sizeof(qname)))
+ return NULL;
+ return worker_resolve_mk_pkt_dname(qname, qtype, qclass, options);
+}
+
+struct qr_task *worker_resolve_start(knot_pkt_t *query, struct kr_qflags options)
+{
+ struct worker_ctx *worker = the_worker;
+ if (!worker || !query) {
+ assert(!EINVAL);
+ return NULL;
+ }
+
+
+ struct request_ctx *ctx = request_create(worker, NULL, NULL, NULL, NULL, NULL,
+ worker->next_request_uid);
+ if (!ctx) {
+ return NULL;
+ }
+
+ /* Create task */
+ struct qr_task *task = qr_task_create(ctx);
+ if (!task) {
+ request_free(ctx);
+ return NULL;
+ }
+
+ /* Start task */
+ int ret = request_start(ctx, query);
+ if (ret != 0) {
+ /* task is attached to request context,
+ * so dereference (and deallocate) it first */
+ ctx->task = NULL;
+ qr_task_unref(task);
+ request_free(ctx);
+ return NULL;
+ }
+
+ worker->next_request_uid += 1;
+ if (worker->next_request_uid == 0) {
+ worker->next_request_uid = UINT16_MAX + 1;
+ }
+
+ /* Set options late, as qr_task_start() -> kr_resolve_begin() rewrite it. */
+ kr_qflags_set(&task->ctx->req.options, options);
+ return task;
+}
+
+int worker_resolve_exec(struct qr_task *task, knot_pkt_t *query)
+{
+ if (!task) {
+ return kr_error(EINVAL);
+ }
+ return qr_task_step(task, NULL, query);
+}
+
+int worker_task_numrefs(const struct qr_task *task)
+{
+ return task->refs;
+}
+
+struct kr_request *worker_task_request(struct qr_task *task)
+{
+ if (!task || !task->ctx) {
+ return NULL;
+ }
+
+ return &task->ctx->req;
+}
+
+int worker_task_finalize(struct qr_task *task, int state)
+{
+ return qr_task_finalize(task, state);
+}
+
+ int worker_task_step(struct qr_task *task, const struct sockaddr *packet_source,
+ knot_pkt_t *packet)
+ {
+ return qr_task_step(task, packet_source, packet);
+ }
+
+void worker_task_complete(struct qr_task *task)
+{
+ qr_task_complete(task);
+}
+
+void worker_task_ref(struct qr_task *task)
+{
+ qr_task_ref(task);
+}
+
+void worker_task_unref(struct qr_task *task)
+{
+ qr_task_unref(task);
+}
+
+void worker_task_timeout_inc(struct qr_task *task)
+{
+ task->timeouts += 1;
+}
+
+knot_pkt_t *worker_task_get_pktbuf(const struct qr_task *task)
+{
+ return task->pktbuf;
+}
+
+struct request_ctx *worker_task_get_request(struct qr_task *task)
+{
+ return task->ctx;
+}
+
+struct session *worker_request_get_source_session(struct request_ctx *ctx)
+{
+ return ctx->source.session;
+}
+
+void worker_request_set_source_session(struct request_ctx *ctx, struct session *session)
+{
+ ctx->source.session = session;
+}
+
+uint16_t worker_task_pkt_get_msgid(struct qr_task *task)
+{
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ uint16_t msg_id = knot_wire_get_id(pktbuf->wire);
+ return msg_id;
+}
+
+void worker_task_pkt_set_msgid(struct qr_task *task, uint16_t msgid)
+{
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ knot_wire_set_id(pktbuf->wire, msgid);
+ struct kr_query *q = task_get_last_pending_query(task);
+ q->id = msgid;
+}
+
+uint64_t worker_task_creation_time(struct qr_task *task)
+{
+ return task->creation_time;
+}
+
+void worker_task_subreq_finalize(struct qr_task *task)
+{
+ subreq_finalize(task, NULL, NULL);
+}
+
+bool worker_task_finished(struct qr_task *task)
+{
+ return task->finished;
+}
+
+/** Reserve worker buffers. We assume worker's been zeroed. */
+static int worker_reserve(struct worker_ctx *worker, size_t ring_maxlen)
+{
+ worker->tcp_connected = map_make(NULL);
+ worker->tcp_waiting = map_make(NULL);
+ worker->subreq_out = trie_create(NULL);
+
+ array_init(worker->pool_mp);
+ if (array_reserve(worker->pool_mp, ring_maxlen)) {
+ return kr_error(ENOMEM);
+ }
+
+ mm_ctx_mempool(&worker->pkt_pool, 4 * sizeof(knot_pkt_t));
+
+ return kr_ok();
+}
+
+static inline void reclaim_mp_freelist(mp_freelist_t *list)
+{
+ for (unsigned i = 0; i < list->len; ++i) {
+ struct mempool *e = list->at[i];
+ kr_asan_unpoison(e, sizeof(*e));
+ mp_delete(e);
+ }
+ array_clear(*list);
+}
+
+void worker_deinit(void)
+{
+ struct worker_ctx *worker = the_worker;
+ assert(worker);
+ if (worker->z_import != NULL) {
+ zi_free(worker->z_import);
+ worker->z_import = NULL;
+ }
+ map_clear(&worker->tcp_connected);
+ map_clear(&worker->tcp_waiting);
+ trie_free(worker->subreq_out);
+ worker->subreq_out = NULL;
+
+ reclaim_mp_freelist(&worker->pool_mp);
+ mp_delete(worker->pkt_pool.ctx);
+ worker->pkt_pool.ctx = NULL;
+
+ the_worker = NULL;
+}
+
+int worker_init(struct engine *engine, int worker_count)
+{
+ assert(engine && engine->L);
+ assert(the_worker == NULL);
+ kr_bindings_register(engine->L);
+
+ /* Create main worker. */
+ struct worker_ctx *worker = &the_worker_value;
+ memset(worker, 0, sizeof(*worker));
+ worker->engine = engine;
+
+ uv_loop_t *loop = uv_default_loop();
+ worker->loop = loop;
+
+ worker->count = worker_count;
+
+ /* Register table for worker per-request variables */
+ lua_newtable(engine->L);
+ lua_setfield(engine->L, -2, "vars");
+ lua_getfield(engine->L, -1, "vars");
+ worker->vars_table_ref = luaL_ref(engine->L, LUA_REGISTRYINDEX);
+ lua_pop(engine->L, 1);
+
+ worker->tcp_pipeline_max = MAX_PIPELINED;
+ worker->out_addr4.sin_family = AF_UNSPEC;
+ worker->out_addr6.sin6_family = AF_UNSPEC;
+
+ int ret = worker_reserve(worker, MP_FREELIST_SIZE);
+ if (ret) return ret;
+ worker->next_request_uid = UINT16_MAX + 1;
+
+ /* Set some worker.* fields in Lua */
+ lua_getglobal(engine->L, "worker");
+ pid_t pid = getpid();
+
+ auto_free char *pid_str = NULL;
+ const char *inst_name = getenv("SYSTEMD_INSTANCE");
+ if (inst_name) {
+ lua_pushstring(engine->L, inst_name);
+ } else {
+ ret = asprintf(&pid_str, "%ld", (long)pid);
+ assert(ret > 0);
+ lua_pushstring(engine->L, pid_str);
+ }
+ lua_setfield(engine->L, -2, "id");
+
+ lua_pushnumber(engine->L, pid);
+ lua_setfield(engine->L, -2, "pid");
+ lua_pushnumber(engine->L, worker_count);
+ lua_setfield(engine->L, -2, "count");
+
+ char cwd[PATH_MAX];
+ get_workdir(cwd, sizeof(cwd));
+ lua_pushstring(engine->L, cwd);
+ lua_setfield(engine->L, -2, "cwd");
+
+ the_worker = worker;
+ loop->data = the_worker;
+ /* ^^^^ Now this shouldn't be used anymore, but it's hard to be 100% sure. */
+ return kr_ok();
+}
+
+#undef VERBOSE_MSG
diff --git a/daemon/worker.h b/daemon/worker.h
new file mode 100644
index 0000000..5f7be5b
--- /dev/null
+++ b/daemon/worker.h
@@ -0,0 +1,192 @@
+/* Copyright (C) 2014-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "daemon/engine.h"
+#include "lib/generic/array.h"
+#include "lib/generic/map.h"
+
+
+/** Query resolution task (opaque). */
+struct qr_task;
+/** Worker state (opaque). */
+struct worker_ctx;
+/** Transport session (opaque). */
+struct session;
+/** Zone import context (opaque). */
+struct zone_import_ctx;
+
+/** Pointer to the singleton worker. NULL if not initialized. */
+KR_EXPORT extern struct worker_ctx *the_worker;
+
+/** Create and initialize the worker.
+ * \return error code (ENOMEM) */
+int worker_init(struct engine *engine, int worker_count);
+
+/** Destroy the worker (free memory). */
+void worker_deinit(void);
+
+/**
+ * Process an incoming packet (query from a client or answer from upstream).
+ *
+ * @param session session the packet came from, or NULL (not from network)
+ * @param peer address the packet came from, or NULL (not from network)
+ * @param eth_* MAC addresses or NULL (they're useful for XDP)
+ * @param pkt the packet, or NULL (an error from the transport layer)
+ * @return 0 or an error code
+ */
+int worker_submit(struct session *session,
+ const struct sockaddr *peer, const struct sockaddr *dst_addr,
+ const uint8_t *eth_from, const uint8_t *eth_to, knot_pkt_t *pkt);
+
+/**
+ * End current DNS/TCP session, this disassociates pending tasks from this session
+ * which may be freely closed afterwards.
+ */
+int worker_end_tcp(struct session *session);
+
+KR_EXPORT knot_pkt_t *worker_resolve_mk_pkt_dname(knot_dname_t *qname, uint16_t qtype, uint16_t qclass,
+ const struct kr_qflags *options);
+
+/**
+ * Create a packet suitable for worker_resolve_start(). All in malloc() memory.
+ */
+KR_EXPORT knot_pkt_t *
+worker_resolve_mk_pkt(const char *qname_str, uint16_t qtype, uint16_t qclass,
+ const struct kr_qflags *options);
+
+/**
+ * Start query resolution with given query.
+ *
+ * @return task or NULL
+ */
+KR_EXPORT struct qr_task *
+worker_resolve_start(knot_pkt_t *query, struct kr_qflags options);
+
+/**
+ * Execute a request with given query.
+ * It expects task to be created with \fn worker_resolve_start.
+ *
+ * @return 0 or an error code
+ */
+KR_EXPORT int worker_resolve_exec(struct qr_task *task, knot_pkt_t *query);
+
+/** @return struct kr_request associated with opaque task */
+struct kr_request *worker_task_request(struct qr_task *task);
+
+int worker_task_step(struct qr_task *task, const struct sockaddr *packet_source,
+ knot_pkt_t *packet);
+
+int worker_task_numrefs(const struct qr_task *task);
+
+/** Finalize given task */
+int worker_task_finalize(struct qr_task *task, int state);
+
+void worker_task_complete(struct qr_task *task);
+
+void worker_task_ref(struct qr_task *task);
+
+void worker_task_unref(struct qr_task *task);
+
+void worker_task_timeout_inc(struct qr_task *task);
+
+int worker_add_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr *addr,
+ struct session *session);
+int worker_del_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr *addr);
+int worker_del_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr* addr);
+struct session* worker_find_tcp_waiting(struct worker_ctx *worker,
+ const struct sockaddr* addr);
+struct session* worker_find_tcp_connected(struct worker_ctx *worker,
+ const struct sockaddr* addr);
+knot_pkt_t *worker_task_get_pktbuf(const struct qr_task *task);
+
+struct request_ctx *worker_task_get_request(struct qr_task *task);
+
+struct session *worker_request_get_source_session(struct request_ctx *);
+
+void worker_request_set_source_session(struct request_ctx *, struct session *session);
+
+uint16_t worker_task_pkt_get_msgid(struct qr_task *task);
+void worker_task_pkt_set_msgid(struct qr_task *task, uint16_t msgid);
+uint64_t worker_task_creation_time(struct qr_task *task);
+void worker_task_subreq_finalize(struct qr_task *task);
+bool worker_task_finished(struct qr_task *task);
+
+/** To be called after sending a DNS message. It mainly deals with cleanups. */
+int qr_task_on_send(struct qr_task *task, const uv_handle_t *handle, int status);
+
+/** Various worker statistics. Sync with wrk_stats() */
+struct worker_stats {
+ size_t queries; /**< Total number of requests (from clients and internal ones). */
+ size_t concurrent; /**< The number of requests currently in processing. */
+ size_t rconcurrent; /*< TODO: remove? I see no meaningful difference from .concurrent. */
+ size_t dropped; /**< The number of requests dropped due to being badly formed. See #471. */
+
+ size_t timeout; /**< Number of outbound queries that timed out. */
+ size_t udp; /**< Number of outbound queries over UDP. */
+ size_t tcp; /**< Number of outbound queries over TCP (excluding TLS). */
+ size_t tls; /**< Number of outbound queries over TLS. */
+ size_t ipv4; /**< Number of outbound queries over IPv4.*/
+ size_t ipv6; /**< Number of outbound queries over IPv6. */
+
+ size_t err_udp; /**< Total number of write errors for UDP transport. */
+ size_t err_tcp; /**< Total number of write errors for TCP transport. */
+ size_t err_tls; /**< Total number of write errors for TLS transport. */
+ size_t err_http; /**< Total number of write errors for HTTP(S) transport. */
+};
+
+/** @cond internal */
+
+/** Number of request within timeout window. */
+#define MAX_PENDING 4
+
+/** Maximum response time from TCP upstream, milliseconds */
+#define MAX_TCP_INACTIVITY (KR_RESOLVE_TIME_LIMIT + KR_CONN_RTT_MAX)
+
+#ifndef RECVMMSG_BATCH /* see check_bufsize() */
+#define RECVMMSG_BATCH 1
+#endif
+
+/** Freelist of available mempools. */
+typedef array_t(struct mempool *) mp_freelist_t;
+
+/** List of query resolution tasks. */
+typedef array_t(struct qr_task *) qr_tasklist_t;
+
+/** \details Worker state is meant to persist during the whole life of daemon. */
+struct worker_ctx {
+ struct engine *engine;
+ uv_loop_t *loop;
+ int count; /** unreliable, does not count systemd instance, do not use */
+ int vars_table_ref;
+ unsigned tcp_pipeline_max;
+
+ /** Addresses to bind for outgoing connections or AF_UNSPEC. */
+ struct sockaddr_in out_addr4;
+ struct sockaddr_in6 out_addr6;
+
+ uint8_t wire_buf[RECVMMSG_BATCH * KNOT_WIRE_MAX_PKTSIZE];
+
+ struct worker_stats stats;
+
+ struct zone_import_ctx* z_import;
+ bool too_many_open;
+ size_t rconcurrent_highwatermark;
+ /** List of active outbound TCP sessions */
+ map_t tcp_connected;
+ /** List of outbound TCP sessions waiting to be accepted */
+ map_t tcp_waiting;
+ /** Subrequest leaders (struct qr_task*), indexed by qname+qtype+qclass. */
+ trie_t *subreq_out;
+ mp_freelist_t pool_mp;
+ knot_mm_t pkt_pool;
+ unsigned int next_request_uid;
+};
+
+/** @endcond */
+
diff --git a/daemon/zimport.c b/daemon/zimport.c
new file mode 100644
index 0000000..a634454
--- /dev/null
+++ b/daemon/zimport.c
@@ -0,0 +1,815 @@
+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/* Module is intended to import resource records from file into resolver's cache.
+ * File supposed to be a standard DNS zone file
+ * which contains text representations of resource records.
+ * For now only root zone import is supported.
+ *
+ * Import process consists of two stages.
+ * 1) Zone file parsing.
+ * 2) Import of parsed entries into the cache.
+ *
+ * These stages are implemented as two separate functions
+ * (zi_zone_import and zi_zone_process) which runs sequentially with the
+ * pause between them. This is done because resolver is a single-threaded
+ * application, so it can't process user's requests during the whole import
+ * process. Separation into two stages allows to reduce the
+ * continuous time interval when resolver can't serve user requests.
+ * Since root zone isn't large it is imported as single
+ * chunk. If it would be considered as necessary, import stage can be
+ * split into shorter stages.
+ *
+ * zi_zone_import() uses libzscanner to parse zone file.
+ * Parsed records are stored to internal storage from where they are imported to
+ * cache during the second stage.
+ *
+ * zi_zone_process() imports parsed resource records to cache.
+ * It imports rrset by creating request that will never be sent to upstream.
+ * After request creation resolver creates pseudo-answer which must contain
+ * all necessary data for validation. Then resolver process answer as if he had
+ * been received from network.
+ */
+
+#include <inttypes.h> /* PRIu64 */
+#include <limits.h>
+#include <stdlib.h>
+#include <uv.h>
+#include <ucw/mempool.h>
+#include <libknot/rrset.h>
+#include <libzscanner/scanner.h>
+
+#include "lib/utils.h"
+#include "lib/dnssec/ta.h"
+#include "daemon/worker.h"
+#include "daemon/zimport.h"
+#include "lib/generic/map.h"
+#include "lib/generic/array.h"
+
+#define VERBOSE_MSG(qry, ...) QRVERBOSE(qry, "zimport", __VA_ARGS__)
+
+/* Pause between parse and import stages, milliseconds.
+ * See comment in zi_zone_import() */
+#define ZONE_IMPORT_PAUSE 100
+
+typedef array_t(knot_rrset_t *) qr_rrsetlist_t;
+
+struct zone_import_ctx {
+ struct worker_ctx *worker;
+ bool started;
+ knot_dname_t *origin;
+ knot_rrset_t *ta;
+ knot_rrset_t *key;
+ uint64_t start_timestamp;
+ size_t rrset_idx;
+ uv_timer_t timer;
+ map_t rrset_indexed;
+ qr_rrsetlist_t rrset_sorted;
+ knot_mm_t pool;
+ zi_callback cb;
+ void *cb_param;
+};
+
+typedef struct zone_import_ctx zone_import_ctx_t;
+
+static int RRSET_IS_ALREADY_IMPORTED = 1;
+
+/** @internal Allocate zone import context.
+ * @return pointer to zone import context or NULL. */
+static zone_import_ctx_t *zi_ctx_alloc()
+{
+ return calloc(1, sizeof(zone_import_ctx_t));
+}
+
+/** @internal Free zone import context. */
+static void zi_ctx_free(zone_import_ctx_t *z_import)
+{
+ if (z_import != NULL) {
+ free(z_import);
+ }
+}
+
+/** @internal Reset all fields in the zone import context to their default values.
+ * Flushes memory pool, but doesn't reallocate memory pool buffer.
+ * Doesn't affect timer handle, pointers to callback and callback parameter.
+ * @return 0 if success; -1 if failed. */
+static int zi_reset(struct zone_import_ctx *z_import, size_t rrset_sorted_list_size)
+{
+ mp_flush(z_import->pool.ctx);
+
+ z_import->started = false;
+ z_import->start_timestamp = 0;
+ z_import->rrset_idx = 0;
+ z_import->pool.alloc = (knot_mm_alloc_t) mp_alloc;
+ z_import->rrset_indexed = map_make(&z_import->pool);
+
+ array_init(z_import->rrset_sorted);
+
+ int ret = 0;
+ if (rrset_sorted_list_size) {
+ ret = array_reserve_mm(z_import->rrset_sorted, rrset_sorted_list_size,
+ kr_memreserve, &z_import->pool);
+ }
+
+ return ret;
+}
+
+/** @internal Close callback for timer handle.
+ * @note Actually frees zone import context. */
+static void on_timer_close(uv_handle_t *handle)
+{
+ zone_import_ctx_t *z_import = (zone_import_ctx_t *)handle->data;
+ if (z_import != NULL) {
+ zi_ctx_free(z_import);
+ }
+}
+
+zone_import_ctx_t *zi_allocate(struct worker_ctx *worker,
+ zi_callback cb, void *param)
+{
+ if (worker->loop == NULL) {
+ return NULL;
+ }
+ zone_import_ctx_t *z_import = zi_ctx_alloc();
+ if (!z_import) {
+ return NULL;
+ }
+ void *mp = mp_new (8192);
+ if (!mp) {
+ zi_ctx_free(z_import);
+ return NULL;
+ }
+ z_import->pool.ctx = mp;
+ z_import->worker = worker;
+ int ret = zi_reset(z_import, 0);
+ if (ret < 0) {
+ mp_delete(mp);
+ zi_ctx_free(z_import);
+ return NULL;
+ }
+ uv_timer_init(z_import->worker->loop, &z_import->timer);
+ z_import->timer.data = z_import;
+ z_import->cb = cb;
+ z_import->cb_param = param;
+ return z_import;
+}
+
+void zi_free(zone_import_ctx_t *z_import)
+{
+ z_import->started = false;
+ z_import->start_timestamp = 0;
+ z_import->rrset_idx = 0;
+ mp_delete(z_import->pool.ctx);
+ z_import->pool.ctx = NULL;
+ z_import->pool.alloc = NULL;
+ z_import->worker = NULL;
+ z_import->cb = NULL;
+ z_import->cb_param = NULL;
+ uv_close((uv_handle_t *)&z_import->timer, on_timer_close);
+}
+
+/** @internal Mark rrset that has been already imported
+ * to avoid repeated import. */
+static inline void zi_rrset_mark_as_imported(knot_rrset_t *rr)
+{
+ rr->additional = (void *)&RRSET_IS_ALREADY_IMPORTED;
+}
+
+/** @internal Check if rrset is marked as "already imported".
+ * @return true if marked, false if isn't */
+static inline bool zi_rrset_is_marked_as_imported(knot_rrset_t *rr)
+{
+ return (rr->additional == &RRSET_IS_ALREADY_IMPORTED);
+}
+
+/** @internal Try to find rrset with given requisites amongst parsed rrsets
+ * and put it to given packet. If there is RRSIG which covers that rrset, it
+ * will be added as well. If rrset found and successfully put, it marked as
+ * "already imported" to avoid repeated import. The same is true for RRSIG.
+ * @return -1 if failed
+ * 0 if required record been actually put into the packet
+ * 1 if required record could not be found */
+static int zi_rrset_find_put(struct zone_import_ctx *z_import,
+ knot_pkt_t *pkt, const knot_dname_t *owner,
+ uint16_t class, uint16_t type, uint16_t additional)
+{
+ if (type != KNOT_RRTYPE_RRSIG) {
+ /* If required rrset isn't rrsig, these must be the same values */
+ additional = type;
+ }
+
+ char key[KR_RRKEY_LEN];
+ int err = kr_rrkey(key, class, owner, type, additional);
+ if (err <= 0) {
+ return -1;
+ }
+ knot_rrset_t *rr = map_get(&z_import->rrset_indexed, key);
+ if (!rr) {
+ return 1;
+ }
+ err = knot_pkt_put(pkt, 0, rr, 0);
+ if (err != KNOT_EOK) {
+ return -1;
+ }
+ zi_rrset_mark_as_imported(rr);
+
+ if (type != KNOT_RRTYPE_RRSIG) {
+ /* Try to find corresponding rrsig */
+ err = zi_rrset_find_put(z_import, pkt, owner,
+ class, KNOT_RRTYPE_RRSIG, type);
+ if (err < 0) {
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+/** @internal Try to put given rrset to the given packet.
+ * If there is RRSIG which covers that rrset, it will be added as well.
+ * If rrset successfully put in the packet, it marked as
+ * "already imported" to avoid repeated import.
+ * The same is true for RRSIG.
+ * @return -1 if failed
+ * 0 if required record been actually put into the packet */
+static int zi_rrset_put(struct zone_import_ctx *z_import, knot_pkt_t *pkt,
+ knot_rrset_t *rr)
+{
+ assert(rr);
+ assert(rr->type != KNOT_RRTYPE_RRSIG);
+ int err = knot_pkt_put(pkt, 0, rr, 0);
+ if (err != KNOT_EOK) {
+ return -1;
+ }
+ zi_rrset_mark_as_imported(rr);
+ /* Try to find corresponding RRSIG */
+ err = zi_rrset_find_put(z_import, pkt, rr->owner, rr->rclass,
+ KNOT_RRTYPE_RRSIG, rr->type);
+ return (err < 0) ? err : 0;
+}
+
+/** @internal Try to put DS & NSEC* for rset->owner to given packet.
+ * @return -1 if failed;
+ * 0 if no errors occurred (it doesn't mean
+ * that records were actually added). */
+static int zi_put_delegation(zone_import_ctx_t *z_import, knot_pkt_t *pkt,
+ knot_rrset_t *rr)
+{
+ int err = zi_rrset_find_put(z_import, pkt, rr->owner,
+ rr->rclass, KNOT_RRTYPE_DS, 0);
+ if (err == 1) {
+ /* DS not found, maybe there are NSEC* */
+ err = zi_rrset_find_put(z_import, pkt, rr->owner,
+ rr->rclass, KNOT_RRTYPE_NSEC, 0);
+ if (err >= 0) {
+ err = zi_rrset_find_put(z_import, pkt, rr->owner,
+ rr->rclass, KNOT_RRTYPE_NSEC3, 0);
+ }
+ }
+ return err < 0 ? err : 0;
+}
+
+/** @internal Try to put A & AAAA records for rset->owner to given packet.
+ * @return -1 if failed;
+ * 0 if no errors occurred (it doesn't mean
+ * that records were actually added). */
+static int zi_put_glue(zone_import_ctx_t *z_import, knot_pkt_t *pkt,
+ knot_rrset_t *rr)
+{
+ int err = 0;
+ knot_rdata_t *rdata_i = rr->rrs.rdata;
+ for (uint16_t i = 0; i < rr->rrs.count;
+ ++i, rdata_i = knot_rdataset_next(rdata_i)) {
+ const knot_dname_t *ns_name = knot_ns_name(rdata_i);
+ err = zi_rrset_find_put(z_import, pkt, ns_name,
+ rr->rclass, KNOT_RRTYPE_A, 0);
+ if (err < 0) {
+ break;
+ }
+
+ err = zi_rrset_find_put(z_import, pkt, ns_name,
+ rr->rclass, KNOT_RRTYPE_AAAA, 0);
+ if (err < 0) {
+ break;
+ }
+ }
+ return err < 0 ? err : 0;
+}
+
+/** @internal Create query. */
+static knot_pkt_t *zi_query_create(zone_import_ctx_t *z_import, knot_rrset_t *rr)
+{
+ knot_mm_t *pool = &z_import->pool;
+
+ uint32_t msgid = kr_rand_bytes(2);
+
+ knot_pkt_t *query = knot_pkt_new(NULL, KNOT_WIRE_MAX_PKTSIZE, pool);
+ if (!query) {
+ return NULL;
+ }
+
+ knot_pkt_put_question(query, rr->owner, rr->rclass, rr->type);
+ knot_pkt_begin(query, KNOT_ANSWER);
+ knot_wire_set_rd(query->wire);
+ knot_wire_set_id(query->wire, msgid);
+ int err = knot_pkt_parse(query, 0);
+ if (err != KNOT_EOK) {
+ knot_pkt_free(query);
+ return NULL;
+ }
+
+ return query;
+}
+
+/** @internal Import given rrset to cache.
+ * @return -1 if failed; 0 if success */
+static int zi_rrset_import(zone_import_ctx_t *z_import, knot_rrset_t *rr)
+{
+ /* Create "pseudo query" which asks for given rrset. */
+ knot_pkt_t *query = zi_query_create(z_import, rr);
+ if (!query) {
+ return -1;
+ }
+
+ knot_mm_t *pool = &z_import->pool;
+ uint8_t *dname = rr->owner;
+ uint16_t rrtype = rr->type;
+ uint16_t rrclass = rr->rclass;
+
+ /* Create "pseudo answer". */
+ knot_pkt_t *answer = knot_pkt_new(NULL, KNOT_WIRE_MAX_PKTSIZE, pool);
+ if (!answer) {
+ knot_pkt_free(query);
+ return -1;
+ }
+ knot_pkt_put_question(answer, dname, rrclass, rrtype);
+ knot_pkt_begin(answer, KNOT_ANSWER);
+
+ struct kr_qflags options = { 0 };
+ options.DNSSEC_WANT = true;
+ options.NO_MINIMIZE = true;
+
+ /* This call creates internal structures which necessary for
+ * resolving - qr_task & request_ctx. */
+ struct qr_task *task = worker_resolve_start(query, options);
+ if (!task) {
+ knot_pkt_free(query);
+ knot_pkt_free(answer);
+ return -1;
+ }
+
+ /* Push query to the request resolve plan.
+ * Actually query will never been sent to upstream. */
+ struct kr_request *request = worker_task_request(task);
+ struct kr_rplan *rplan = &request->rplan;
+ struct kr_query *qry = kr_rplan_push(rplan, NULL, dname, rrclass, rrtype);
+ int state = KR_STATE_FAIL;
+ bool origin_is_owner = knot_dname_is_equal(rr->owner, z_import->origin);
+ bool is_referral = (rrtype == KNOT_RRTYPE_NS && !origin_is_owner);
+ uint32_t msgid = knot_wire_get_id(query->wire);
+
+ qry->id = msgid;
+
+ /* Prepare zonecut. It must have all the necessary requisites for
+ * successful validation - matched zone name & keys & trust-anchors. */
+ kr_zonecut_init(&qry->zone_cut, z_import->origin, pool);
+ qry->zone_cut.key = z_import->key;
+ qry->zone_cut.trust_anchor = z_import->ta;
+
+ if (knot_pkt_init_response(answer, query) != 0) {
+ goto cleanup;
+ }
+
+ /* Since "pseudo" query asks for NS for subzone,
+ * "pseudo" answer must simulate referral. */
+ if (is_referral) {
+ knot_pkt_begin(answer, KNOT_AUTHORITY);
+ }
+
+ /* Put target rrset to ANSWER\AUTHORIRY as well as corresponding RRSIG */
+ int err = zi_rrset_put(z_import, answer, rr);
+ if (err != 0) {
+ goto cleanup;
+ }
+
+ if (!is_referral) {
+ knot_wire_set_aa(answer->wire);
+ } else {
+ /* Type is KNOT_RRTYPE_NS and owner is not equal to origin.
+ * It will be "referral" answer and must contain delegation. */
+ err = zi_put_delegation(z_import, answer, rr);
+ if (err < 0) {
+ goto cleanup;
+ }
+ }
+
+ knot_pkt_begin(answer, KNOT_ADDITIONAL);
+
+ if (rrtype == KNOT_RRTYPE_NS) {
+ /* Try to find glue addresses. */
+ err = zi_put_glue(z_import, answer, rr);
+ if (err < 0) {
+ goto cleanup;
+ }
+ }
+
+ knot_wire_set_id(answer->wire, msgid);
+ answer->parsed = answer->size;
+ err = knot_pkt_parse(answer, 0);
+ if (err != KNOT_EOK) {
+ goto cleanup;
+ }
+
+ /* Importing doesn't imply communication with upstream at all.
+ * "answer" contains pseudo-answer from upstream and must be successfully
+ * validated in CONSUME stage. If not, something gone wrong. */
+ state = kr_resolve_consume(request, NULL, answer);
+
+cleanup:
+
+ knot_pkt_free(query);
+ knot_pkt_free(answer);
+ worker_task_finalize(task, state);
+ return state == (is_referral ? KR_STATE_PRODUCE : KR_STATE_DONE) ? 0 : -1;
+}
+
+/** @internal Create element in qr_rrsetlist_t rrset_list for
+ * given node of map_t rrset_sorted. */
+static int zi_mapwalk_preprocess(const char *k, void *v, void *baton)
+{
+ zone_import_ctx_t *z_import = (zone_import_ctx_t *)baton;
+
+ int ret = array_push_mm(z_import->rrset_sorted, v, kr_memreserve, &z_import->pool);
+
+ return (ret < 0);
+}
+
+/** @internal Iterate over parsed rrsets and try to import each of them. */
+static void zi_zone_process(uv_timer_t* handle)
+{
+ zone_import_ctx_t *z_import = (zone_import_ctx_t *)handle->data;
+
+ assert(z_import->worker);
+
+ size_t failed = 0;
+ size_t ns_imported = 0;
+ size_t other_imported = 0;
+
+ /* At the moment import of root zone only is supported.
+ * Check the name of the parsed zone.
+ * TODO - implement importing of arbitrary zone. */
+ KR_DNAME_GET_STR(zone_name_str, z_import->origin);
+
+ if (strcmp(".", zone_name_str) != 0) {
+ kr_log_error("[zimport] unexpected zone name `%s` (root zone expected), fail\n",
+ zone_name_str);
+ failed = 1;
+ goto finish;
+ }
+
+ if (z_import->rrset_sorted.len <= 0) {
+ kr_log_error("[zimport] zone `%s` is empty\n", zone_name_str);
+ goto finish;
+ }
+
+ /* TA have been found, zone is secured.
+ * DNSKEY must be somewhere amongst the imported records. Find it.
+ * TODO - For those zones that provenly do not have TA this step must be skipped. */
+ char key[KR_RRKEY_LEN];
+ int err = kr_rrkey(key, KNOT_CLASS_IN, z_import->origin,
+ KNOT_RRTYPE_DNSKEY, KNOT_RRTYPE_DNSKEY);
+ if (err <= 0) {
+ failed = 1;
+ goto finish;
+ }
+
+ knot_rrset_t *rr_key = map_get(&z_import->rrset_indexed, key);
+ if (!rr_key) {
+ /* DNSKEY MUST be here. If not found - fail. */
+ kr_log_error("[zimport] DNSKEY not found for `%s`, fail\n", zone_name_str);
+ failed = 1;
+ goto finish;
+ }
+ z_import->key = rr_key;
+
+ map_t *trust_anchors = &z_import->worker->engine->resolver.trust_anchors;
+ knot_rrset_t *rr_ta = kr_ta_get(trust_anchors, z_import->origin);
+ if (!rr_ta) {
+ kr_log_error("[zimport] error: TA for zone `%s` vanished, fail", zone_name_str);
+ failed = 1;
+ goto finish;
+ }
+ z_import->ta = rr_ta;
+
+ VERBOSE_MSG(NULL, "started: zone: '%s'\n", zone_name_str);
+
+ z_import->start_timestamp = kr_now();
+
+ /* Import DNSKEY at first step. If any validation problems will appear,
+ * cancel import of whole zone. */
+ KR_DNAME_GET_STR(kname_str, rr_key->owner);
+ KR_RRTYPE_GET_STR(ktype_str, rr_key->type);
+
+ VERBOSE_MSG(NULL, "importing: name: '%s' type: '%s'\n",
+ kname_str, ktype_str);
+
+ int res = zi_rrset_import(z_import, rr_key);
+ if (res != 0) {
+ kr_log_error("[zimport] import failed: qname: '%s' type: '%s'\n",
+ kname_str, ktype_str);
+ failed = 1;
+ goto finish;
+ }
+
+ /* Import all NS records */
+ for (size_t i = 0; i < z_import->rrset_sorted.len; ++i) {
+ knot_rrset_t *rr = z_import->rrset_sorted.at[i];
+
+ if (rr->type != KNOT_RRTYPE_NS) {
+ continue;
+ }
+
+ KR_DNAME_GET_STR(name_str, rr->owner);
+ KR_RRTYPE_GET_STR(type_str, rr->type);
+ VERBOSE_MSG(NULL, "importing: name: '%s' type: '%s'\n",
+ name_str, type_str);
+ int ret = zi_rrset_import(z_import, rr);
+ if (ret == 0) {
+ ++ns_imported;
+ } else {
+ VERBOSE_MSG(NULL, "import failed: name: '%s' type: '%s'\n",
+ name_str, type_str);
+ ++failed;
+ }
+ z_import->rrset_sorted.at[i] = NULL;
+ }
+
+ /* NS records have been imported as well as relative DS, NSEC* and glue.
+ * Now import what's left. */
+ for (size_t i = 0; i < z_import->rrset_sorted.len; ++i) {
+
+ knot_rrset_t *rr = z_import->rrset_sorted.at[i];
+ if (rr == NULL) {
+ continue;
+ }
+
+ if (zi_rrset_is_marked_as_imported(rr)) {
+ continue;
+ }
+
+ if (rr->type == KNOT_RRTYPE_DNSKEY || rr->type == KNOT_RRTYPE_RRSIG) {
+ continue;
+ }
+
+ KR_DNAME_GET_STR(name_str, rr->owner);
+ KR_RRTYPE_GET_STR(type_str, rr->type);
+ VERBOSE_MSG(NULL, "importing: name: '%s' type: '%s'\n",
+ name_str, type_str);
+ res = zi_rrset_import(z_import, rr);
+ if (res == 0) {
+ ++other_imported;
+ } else {
+ VERBOSE_MSG(NULL, "import failed: name: '%s' type: '%s'\n",
+ name_str, type_str);
+ ++failed;
+ }
+ }
+
+ uint64_t elapsed = kr_now() - z_import->start_timestamp;
+ elapsed = elapsed > UINT_MAX ? UINT_MAX : elapsed;
+
+ VERBOSE_MSG(NULL, "finished in %"PRIu64" ms; zone: `%s`; ns: %zd"
+ "; other: %zd; failed: %zd\n",
+ elapsed, zone_name_str, ns_imported, other_imported, failed);
+
+finish:
+
+ uv_timer_stop(&z_import->timer);
+ z_import->started = false;
+
+ int import_state = 0;
+
+ if (failed != 0) {
+ if (ns_imported == 0 && other_imported == 0) {
+ import_state = -1;
+ kr_log_error("[zimport] import failed; zone `%s` \n", zone_name_str);
+ } else {
+ import_state = 1;
+ }
+ } else {
+ import_state = 0;
+ }
+
+ if (z_import->cb != NULL) {
+ z_import->cb(import_state, z_import->cb_param);
+ }
+}
+
+/** @internal Store rrset that has been imported to zone import context memory pool.
+ * @return -1 if failed; 0 if success. */
+static int zi_record_store(zs_scanner_t *s)
+{
+ if (s->r_data_length > UINT16_MAX) {
+ /* Due to knot_rrset_add_rdata(..., const uint16_t size, ...); */
+ kr_log_error("[zscanner] line %"PRIu64": rdata is too long\n",
+ s->line_counter);
+ return -1;
+ }
+
+ if (knot_dname_size(s->r_owner) != strlen((const char *)(s->r_owner)) + 1) {
+ kr_log_error("[zscanner] line %"PRIu64
+ ": owner name contains zero byte, skip\n",
+ s->line_counter);
+ return 0;
+ }
+
+ zone_import_ctx_t *z_import = (zone_import_ctx_t *)s->process.data;
+
+ knot_rrset_t *new_rr = knot_rrset_new(s->r_owner, s->r_type, s->r_class,
+ s->r_ttl, &z_import->pool);
+ if (!new_rr) {
+ kr_log_error("[zscanner] line %"PRIu64": error creating rrset\n",
+ s->line_counter);
+ return -1;
+ }
+ int res = knot_rrset_add_rdata(new_rr, s->r_data, s->r_data_length,
+ &z_import->pool);
+ if (res != KNOT_EOK) {
+ kr_log_error("[zscanner] line %"PRIu64": error adding rdata to rrset\n",
+ s->line_counter);
+ return -1;
+ }
+
+ /* Records in zone file may not be grouped by name and RR type.
+ * Use map to create search key and
+ * avoid ineffective searches across all the imported records. */
+ char key[KR_RRKEY_LEN];
+ uint16_t additional_key_field = kr_rrset_type_maysig(new_rr);
+
+ res = kr_rrkey(key, new_rr->rclass, new_rr->owner, new_rr->type,
+ additional_key_field);
+ if (res <= 0) {
+ kr_log_error("[zscanner] line %"PRIu64": error constructing rrkey\n",
+ s->line_counter);
+ return -1;
+ }
+
+ knot_rrset_t *saved_rr = map_get(&z_import->rrset_indexed, key);
+ if (saved_rr) {
+ res = knot_rdataset_merge(&saved_rr->rrs, &new_rr->rrs,
+ &z_import->pool);
+ } else {
+ res = map_set(&z_import->rrset_indexed, key, new_rr);
+ }
+ if (res != 0) {
+ kr_log_error("[zscanner] line %"PRIu64": error saving parsed rrset\n",
+ s->line_counter);
+ return -1;
+ }
+
+ return 0;
+}
+
+/** @internal zscanner callback. */
+static int zi_state_parsing(zs_scanner_t *s)
+{
+ bool empty = true;
+ while (zs_parse_record(s) == 0) {
+ switch (s->state) {
+ case ZS_STATE_DATA:
+ if (zi_record_store(s) != 0) {
+ return -1;
+ }
+ zone_import_ctx_t *z_import = (zone_import_ctx_t *) s->process.data;
+ empty = false;
+ if (s->r_type == 6) {
+ z_import->origin = knot_dname_copy(s->r_owner,
+ &z_import->pool);
+ }
+ break;
+ case ZS_STATE_ERROR:
+ kr_log_error("[zscanner] line: %"PRIu64
+ ": parse error; code: %i ('%s')\n",
+ s->line_counter, s->error.code,
+ zs_strerror(s->error.code));
+ return -1;
+ case ZS_STATE_INCLUDE:
+ kr_log_error("[zscanner] line: %"PRIu64
+ ": INCLUDE is not supported\n",
+ s->line_counter);
+ return -1;
+ case ZS_STATE_EOF:
+ case ZS_STATE_STOP:
+ if (empty) {
+ kr_log_error("[zimport] empty zone file\n");
+ return -1;
+ }
+ if (!((zone_import_ctx_t *) s->process.data)->origin) {
+ kr_log_error("[zimport] zone file doesn't contain SOA record\n");
+ return -1;
+ }
+ return (s->error.counter == 0) ? 0 : -1;
+ default:
+ kr_log_error("[zscanner] line: %"PRIu64
+ ": unexpected parse state: %i\n",
+ s->line_counter, s->state);
+ return -1;
+ }
+ }
+
+ return -1;
+}
+
+int zi_zone_import(struct zone_import_ctx *z_import,
+ const char *zone_file, const char *origin,
+ uint16_t rclass, uint32_t ttl)
+{
+ assert (z_import != NULL && "[zimport] empty <z_import> parameter");
+ assert (z_import->worker != NULL && "[zimport] invalid <z_import> parameter\n");
+ assert (zone_file != NULL && "[zimport] empty <zone_file> parameter\n");
+
+ zs_scanner_t *s = malloc(sizeof(zs_scanner_t));
+ if (s == NULL) {
+ kr_log_error("[zscanner] error creating instance of zone scanner (malloc() fails)\n");
+ return -1;
+ }
+
+ /* zs_init(), zs_set_input_file(), zs_set_processing() returns -1 in case of error,
+ * so don't print error code as it meaningless. */
+ int res = zs_init(s, origin, rclass, ttl);
+ if (res != 0) {
+ kr_log_error("[zscanner] error initializing zone scanner instance, error: %i (%s)\n",
+ s->error.code, zs_strerror(s->error.code));
+ free(s);
+ return -1;
+ }
+
+ res = zs_set_input_file(s, zone_file);
+ if (res != 0) {
+ kr_log_error("[zscanner] error opening zone file `%s`, error: %i (%s)\n",
+ zone_file, s->error.code, zs_strerror(s->error.code));
+ zs_deinit(s);
+ free(s);
+ return -1;
+ }
+
+ /* Don't set processing and error callbacks as we don't use automatic parsing.
+ * Parsing as well error processing will be performed in zi_state_parsing().
+ * Store pointer to zone import context for further use. */
+ if (zs_set_processing(s, NULL, NULL, (void *)z_import) != 0) {
+ kr_log_error("[zscanner] zs_set_processing() failed for zone file `%s`, "
+ "error: %i (%s)\n",
+ zone_file, s->error.code, zs_strerror(s->error.code));
+ zs_deinit(s);
+ free(s);
+ return -1;
+ }
+
+ uint64_t elapsed = 0;
+ int ret = zi_reset(z_import, 4096);
+ if (ret == 0) {
+ z_import->started = true;
+ z_import->start_timestamp = kr_now();
+ VERBOSE_MSG(NULL, "[zscanner] started; zone file `%s`\n",
+ zone_file);
+ ret = zi_state_parsing(s);
+ if (ret == 0) {
+ /* Try to find TA for worker->z_import.origin. */
+ map_t *trust_anchors = &z_import->worker->engine->resolver.trust_anchors;
+ knot_rrset_t *rr = kr_ta_get(trust_anchors, z_import->origin);
+ if (!rr) {
+ /* For now - fail.
+ * TODO - query DS and continue after answer had been obtained. */
+ KR_DNAME_GET_STR(zone_name_str, z_import->origin);
+ kr_log_error("[zimport] no TA found for `%s`, fail\n", zone_name_str);
+ ret = 1;
+ }
+ elapsed = kr_now() - z_import->start_timestamp;
+ elapsed = elapsed > UINT_MAX ? UINT_MAX : elapsed;
+ }
+ }
+ zs_deinit(s);
+ free(s);
+
+ if (ret != 0) {
+ kr_log_error("[zscanner] error parsing zone file `%s`\n", zone_file);
+ z_import->started = false;
+ return ret;
+ }
+
+ VERBOSE_MSG(NULL, "[zscanner] finished in %"PRIu64" ms; zone file `%s`\n",
+ elapsed, zone_file);
+ map_walk(&z_import->rrset_indexed, zi_mapwalk_preprocess, z_import);
+
+ /* Zone have been parsed already, so start the import. */
+ uv_timer_start(&z_import->timer, zi_zone_process,
+ ZONE_IMPORT_PAUSE, ZONE_IMPORT_PAUSE);
+
+ return 0;
+}
+
+bool zi_import_started(struct zone_import_ctx *z_import)
+{
+ return z_import ? z_import->started : false;
+}
diff --git a/daemon/zimport.h b/daemon/zimport.h
new file mode 100644
index 0000000..96e8a73
--- /dev/null
+++ b/daemon/zimport.h
@@ -0,0 +1,56 @@
+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+struct worker_ctx;
+/** Zone import context (opaque). */
+struct zone_import_ctx;
+
+/**
+ * Completion callback
+ *
+ * @param state -1 - fail
+ * 0 - success
+ * 1 - success, but there are non-critical errors
+ * @param pointer to user data
+ */
+typedef void (*zi_callback)(int state, void *param);
+
+/**
+ * Allocate and initialize zone import context.
+ *
+ * @param worker pointer to worker state
+ * @return NULL or pointer to zone import context.
+ */
+struct zone_import_ctx *zi_allocate(struct worker_ctx *worker,
+ zi_callback cb, void *param);
+
+/** Free zone import context. */
+void zi_free(struct zone_import_ctx *z_import);
+
+/**
+ * Import zone from file.
+ *
+ * @note only root zone import is supported; origin must be NULL or "."
+ * @param z_import pointer to zone import context
+ * @param zone_file zone file name
+ * @param origin default origin
+ * @param rclass default class
+ * @param ttl default ttl
+ * @return 0 or an error code
+ */
+int zi_zone_import(struct zone_import_ctx *z_import,
+ const char *zone_file, const char *origin,
+ uint16_t rclass, uint32_t ttl);
+
+/**
+ * Check if import already in process.
+ *
+ * @param z_import pointer to zone import context.
+ * @return true if import already in process; false otherwise.
+ */
+bool zi_import_started(struct zone_import_ctx *z_import);