Merging upstream version 1.19.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 1457 insertions, 13 deletions

diff --git a/web/server/Makefile.am b/web/server/Makefile.am
index 5860a5cba..1ee01bb3a 100644
--- a/web/server/Makefile.am
+++ b/web/server/Makefile.am
@@ -8,5 +8,5 @@ SUBDIRS = \
     $(NULL)
 
 dist_noinst_DATA = \
-	README.md \
-	$(NULL)
+    README.md \
+    $(NULL)
diff --git a/web/server/Makefile.in b/web/server/Makefile.in
new file mode 100644
index 000000000..c58638e65
--- /dev/null
+++ b/web/server/Makefile.in
@@ -0,0 +1,703 @@
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diff --git a/web/server/README.md b/web/server/README.md
index 9f47cb8d9..486617354 100644
--- a/web/server/README.md
+++ b/web/server/README.md
@@ -149,7 +149,7 @@ Netdata supports access lists in `netdata.conf`:
 	allow management from = localhost
 ```
 
-`*` does string matches on the IPs of the clients.
+`*` does string matches on the IPs or FQDNs of the clients.
 
 -   `allow connections from` matches anyone that connects on the Netdata port(s).
      So, if someone is not allowed, it will be connected and disconnected immediately, without reading even
@@ -169,6 +169,26 @@ Netdata supports access lists in `netdata.conf`:
 
 -   `allow management from` checks the IPs to allow API management calls. Management via the API is currently supported for [health](../api/health/#health-management-api)
 
+In order to check the FQDN of the connection without opening the Netdata agent to DNS-spoofing, a reverse-dns record
+must be setup for the connecting host. At connection time the reverse-dns of the peer IP address is resolved, and
+a forward DNS resolution is made to validate the IP address against the name-pattern.
+
+Please note that this process can be expensive on a machine that is serving many connections. Each access list has an
+associated configuration option to turn off DNS-based patterns completely to avoid incurring this cost at run-time:
+
+```
+	allow connections by dns = heuristic
+	allow dashboard by dns = heuristic
+	allow badges by dns = heuristic
+	allow streaming by dns = heuristic
+	allow netdata.conf by dns = no
+	allow management by dns = heuristic
+```
+
+The three possible values for each of these options are `yes`, `no` and `heuristic`. The `heuristic` option disables
+the check when the pattern only contains IPv4/IPv6 addresses or `localhost`, and enables it when wildcards are
+present that may match DNS FQDNs.
+
 ### Other netdata.conf [web] section options
 
 |setting|default|info|
diff --git a/web/server/static/Makefile.am b/web/server/static/Makefile.am
index 90cc9ca1e..59250a997 100644
--- a/web/server/static/Makefile.am
+++ b/web/server/static/Makefile.am
@@ -7,5 +7,5 @@ SUBDIRS = \
     $(NULL)
 
 dist_noinst_DATA = \
-	README.md \
-	$(NULL)
+    README.md \
+    $(NULL)
diff --git a/web/server/static/Makefile.in b/web/server/static/Makefile.in
new file mode 100644
index 000000000..725522456
--- /dev/null
+++ b/web/server/static/Makefile.in
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+PROTOBUF_LIBS = @PROTOBUF_LIBS@
+PROTOC = @PROTOC@
+PTHREAD_CC = @PTHREAD_CC@
+PTHREAD_CFLAGS = @PTHREAD_CFLAGS@
+PTHREAD_LIBS = @PTHREAD_LIBS@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SSE_CANDIDATE = @SSE_CANDIDATE@
+STRIP = @STRIP@
+TEST_CFLAGS = @TEST_CFLAGS@
+TEST_LIBS = @TEST_LIBS@
+UUID_CFLAGS = @UUID_CFLAGS@
+UUID_LIBS = @UUID_LIBS@
+VERSION = @VERSION@
+XENLIGHT_CFLAGS = @XENLIGHT_CFLAGS@
+XENLIGHT_LIBS = @XENLIGHT_LIBS@
+YAJL_CFLAGS = @YAJL_CFLAGS@
+YAJL_LIBS = @YAJL_LIBS@
+ZLIB_CFLAGS = @ZLIB_CFLAGS@
+ZLIB_LIBS = @ZLIB_LIBS@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
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+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
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+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
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+build_os = @build_os@
+build_target = @build_target@
+build_vendor = @build_vendor@
+builddir = @builddir@
+cachedir = @cachedir@
+chartsdir = @chartsdir@
+configdir = @configdir@
+datadir = @datadir@
+datarootdir = @datarootdir@
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+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+has_jemalloc = @has_jemalloc@
+has_tcmalloc = @has_tcmalloc@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libconfigdir = @libconfigdir@
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+localedir = @localedir@
+localstatedir = @localstatedir@
+logdir = @logdir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
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+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+pluginsdir = @pluginsdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+pythondir = @pythondir@
+registrydir = @registrydir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+varlibdir = @varlibdir@
+webdir = @webdir@
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+SUBDIRS = \
+    $(NULL)
+
+dist_noinst_DATA = \
+    README.md \
+    $(NULL)
+
+all: all-recursive
+
+.SUFFIXES:
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu web/server/static/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu web/server/static/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+# This directory's subdirectories are mostly independent; you can cd
+# into them and run 'make' without going through this Makefile.
+# To change the values of 'make' variables: instead of editing Makefiles,
+# (1) if the variable is set in 'config.status', edit 'config.status'
+#     (which will cause the Makefiles to be regenerated when you run 'make');
+# (2) otherwise, pass the desired values on the 'make' command line.
+$(am__recursive_targets):
+	@fail=; \
+	if $(am__make_keepgoing); then \
+	  failcom='fail=yes'; \
+	else \
+	  failcom='exit 1'; \
+	fi; \
+	dot_seen=no; \
+	target=`echo $@ | sed s/-recursive//`; \
+	case "$@" in \
+	  distclean-* | maintainer-clean-*) list='$(DIST_SUBDIRS)' ;; \
+	  *) list='$(SUBDIRS)' ;; \
+	esac; \
+	for subdir in $$list; do \
+	  echo "Making $$target in $$subdir"; \
+	  if test "$$subdir" = "."; then \
+	    dot_seen=yes; \
+	    local_target="$$target-am"; \
+	  else \
+	    local_target="$$target"; \
+	  fi; \
+	  ($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
+	  || eval $$failcom; \
+	done; \
+	if test "$$dot_seen" = "no"; then \
+	  $(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
+	fi; test -z "$$fail"
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-recursive
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	if ($(ETAGS) --etags-include --version) >/dev/null 2>&1; then \
+	  include_option=--etags-include; \
+	  empty_fix=.; \
+	else \
+	  include_option=--include; \
+	  empty_fix=; \
+	fi; \
+	list='$(SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    test ! -f $$subdir/TAGS || \
+	      set "$$@" "$$include_option=$$here/$$subdir/TAGS"; \
+	  fi; \
+	done; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-recursive
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-recursive
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-recursive
+all-am: Makefile $(DATA)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-recursive
+
+clean-am: clean-generic mostlyclean-am
+
+distclean: distclean-recursive
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-generic
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am check \
+	check-am clean clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-generic distclean-tags distdir dvi dvi-am \
+	html html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/web/server/static/static-threaded.c b/web/server/static/static-threaded.c
index c432b9bf3..b9c91ef14 100644
--- a/web/server/static/static-threaded.c
+++ b/web/server/static/static-threaded.c
@@ -396,6 +396,7 @@ void *socket_listen_main_static_threaded_worker(void *ptr) {
                         , web_server_snd_callback
                         , web_server_tmr_callback
                         , web_allow_connections_from
+                        , web_allow_connections_dns
                         , NULL
                         , web_client_first_request_timeout
                         , web_client_timeout
diff --git a/web/server/web_client.c b/web/server/web_client.c
index 53a5944ce..537152660 100644
--- a/web/server/web_client.c
+++ b/web/server/web_client.c
@@ -340,6 +340,8 @@ static inline int access_to_file_is_not_permitted(struct web_client *w, const ch
     return HTTP_RESP_FORBIDDEN;
 }
 
+// Work around a bug in the CMocka library by removing this function during testing.
+#ifndef REMOVE_MYSENDFILE
 int mysendfile(struct web_client *w, char *filename) {
     debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, netdata_configured_web_dir, filename);
 
@@ -448,11 +450,13 @@ int mysendfile(struct web_client *w, char *filename) {
     w->response.data->date = statbuf.st_mtimespec.tv_sec;
 #else
     w->response.data->date = statbuf.st_mtim.tv_sec;
-#endif /* __APPLE__ */
+#endif 
     buffer_cacheable(w->response.data);
 
     return HTTP_RESP_OK;
 }
+#endif
+
 
 
 #ifdef NETDATA_WITH_ZLIB
@@ -1266,7 +1270,7 @@ static inline void web_client_send_http_header(struct web_client *w) {
                 while((bytes = SSL_write(w->ssl.conn, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output))) < 0) {
                     count++;
                     if(count > 100 || (errno != EAGAIN && errno != EWOULDBLOCK)) {
-                        error("Cannot send HTTP headers to web client.");
+                        error("Cannot send HTTPS headers to web client.");
                         break;
                     }
                 }
diff --git a/web/server/web_server.c b/web/server/web_server.c
index b8b84bc36..4da08d431 100644
--- a/web/server/web_server.c
+++ b/web/server/web_server.c
@@ -74,46 +74,53 @@ void api_listen_sockets_setup(void) {
 // access lists
 
 SIMPLE_PATTERN *web_allow_connections_from = NULL;
+int web_allow_connections_dns;
 
 // WEB_CLIENT_ACL
 SIMPLE_PATTERN *web_allow_dashboard_from = NULL;
+int             web_allow_dashboard_dns;
 SIMPLE_PATTERN *web_allow_registry_from = NULL;
+int             web_allow_registry_dns;
 SIMPLE_PATTERN *web_allow_badges_from = NULL;
+int             web_allow_badges_dns;
 SIMPLE_PATTERN *web_allow_mgmt_from = NULL;
+int             web_allow_mgmt_dns;
 SIMPLE_PATTERN *web_allow_streaming_from = NULL;
+int             web_allow_streaming_dns;
 SIMPLE_PATTERN *web_allow_netdataconf_from = NULL;
+int             web_allow_netdataconf_dns;
 
 void web_client_update_acl_matches(struct web_client *w) {
     w->acl = WEB_CLIENT_ACL_NONE;
 
     if (!web_allow_dashboard_from ||
         connection_allowed(w->ifd, w->client_ip, w->client_host, sizeof(w->client_host),
-                           web_allow_dashboard_from, "dashboard"))
+                           web_allow_dashboard_from, "dashboard", web_allow_dashboard_dns))
         w->acl |= WEB_CLIENT_ACL_DASHBOARD;
 
     if (!web_allow_registry_from ||
         connection_allowed(w->ifd, w->client_ip, w->client_host, sizeof(w->client_host),
-                           web_allow_registry_from, "registry"))
+                           web_allow_registry_from, "registry", web_allow_registry_dns))
         w->acl |= WEB_CLIENT_ACL_REGISTRY;
 
     if (!web_allow_badges_from ||
         connection_allowed(w->ifd, w->client_ip, w->client_host, sizeof(w->client_host),
-                           web_allow_badges_from, "badges"))
+                           web_allow_badges_from, "badges", web_allow_badges_dns))
         w->acl |= WEB_CLIENT_ACL_BADGE;
 
     if (!web_allow_mgmt_from ||
         connection_allowed(w->ifd, w->client_ip, w->client_host, sizeof(w->client_host),
-                           web_allow_mgmt_from, "management"))
+                           web_allow_mgmt_from, "management", web_allow_mgmt_dns))
         w->acl |= WEB_CLIENT_ACL_MGMT;
 
     if (!web_allow_streaming_from ||
         connection_allowed(w->ifd, w->client_ip, w->client_host, sizeof(w->client_host),
-                           web_allow_streaming_from, "streaming"))
+                           web_allow_streaming_from, "streaming", web_allow_streaming_dns))
         w->acl |= WEB_CLIENT_ACL_STREAMING;
 
     if (!web_allow_netdataconf_from ||
        connection_allowed(w->ifd, w->client_ip, w->client_host, sizeof(w->client_host),
-                          web_allow_netdataconf_from, "netdata.conf"))
+                          web_allow_netdataconf_from, "netdata.conf", web_allow_netdataconf_dns))
         w->acl |= WEB_CLIENT_ACL_NETDATACONF;
 
     w->acl &= w->port_acl;
diff --git a/web/server/web_server.h b/web/server/web_server.h
index e7c2dd448..7bfc81c9d 100644
--- a/web/server/web_server.h
+++ b/web/server/web_server.h
@@ -20,12 +20,19 @@ typedef enum web_server_mode {
 } WEB_SERVER_MODE;
 
 extern SIMPLE_PATTERN *web_allow_connections_from;
+extern int             web_allow_connections_dns;
 extern SIMPLE_PATTERN *web_allow_dashboard_from;
+extern int             web_allow_dashboard_dns;
 extern SIMPLE_PATTERN *web_allow_registry_from;
+extern int             web_allow_registry_dns;
 extern SIMPLE_PATTERN *web_allow_badges_from;
+extern int             web_allow_badges_dns;
 extern SIMPLE_PATTERN *web_allow_streaming_from;
+extern int             web_allow_streaming_dns;
 extern SIMPLE_PATTERN *web_allow_netdataconf_from;
+extern int             web_allow_netdataconf_dns;
 extern SIMPLE_PATTERN *web_allow_mgmt_from;
+extern int             web_allow_mgmt_dns;
 
 extern WEB_SERVER_MODE web_server_mode;