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-rw-r--r--debian/patches/0003-min-cache-ttl.diff254
1 files changed, 254 insertions, 0 deletions
diff --git a/debian/patches/0003-min-cache-ttl.diff b/debian/patches/0003-min-cache-ttl.diff
new file mode 100644
index 0000000..13453fd
--- /dev/null
+++ b/debian/patches/0003-min-cache-ttl.diff
@@ -0,0 +1,254 @@
+From: Debian DNS Packaging <pkg-dns-devel@lists.alioth.debian.org>
+Date: Fri, 24 Nov 2017 16:26:54 +0000
+Subject: _min-cache-ttl
+
+ Add min-cache-ttl and min-ncache-ttl keywords
+
+ Sometimes it is useful to set a 'floor' on the TTL for records
+ to be cached. Some sites like to use ridiculously low TTLs for
+ some reason, and that often is not compatible with slow links.
+
+ Signed-off-by: Michael Milligan <milli@acmeps.com>
+ Signed-off-by: LaMont Jones <lamont@debian.org>
+---
+ bin/named/config.c | 2 ++
+ bin/named/server.c | 12 ++++++++++++
+ bin/tests/named.conf | 2 ++
+ lib/dns/include/dns/ncache.h | 6 ++++--
+ lib/dns/include/dns/view.h | 2 ++
+ lib/dns/ncache.c | 18 ++++++++++++------
+ lib/dns/resolver.c | 22 ++++++++++++++++------
+ lib/isccfg/namedconf.c | 2 ++
+ 8 files changed, 52 insertions(+), 14 deletions(-)
+
+diff --git a/bin/named/config.c b/bin/named/config.c
+index 2732a8f..d22ee4b 100644
+--- a/bin/named/config.c
++++ b/bin/named/config.c
+@@ -182,6 +182,8 @@ options {\n\
+ max-recursion-depth 7;\n\
+ max-recursion-queries 75;\n\
+ message-compression yes;\n\
++ min-ncache-ttl 0; /* 0 hours */\n\
++ min-cache-ttl 0; /* 0 seconds */\n\
+ # min-roots <obsolete>;\n\
+ minimal-any false;\n\
+ minimal-responses false;\n\
+diff --git a/bin/named/server.c b/bin/named/server.c
+index 7f87ccf..149458e 100644
+--- a/bin/named/server.c
++++ b/bin/named/server.c
+@@ -3706,6 +3706,18 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
+ if (view->maxncachettl > 7 * 24 * 3600)
+ view->maxncachettl = 7 * 24 * 3600;
+
++ obj = NULL;
++ result = ns_config_get(maps, "min-cache-ttl", &obj);
++ INSIST(result == ISC_R_SUCCESS);
++ view->mincachettl = cfg_obj_asuint32(obj);
++
++ obj = NULL;
++ result = ns_config_get(maps, "min-ncache-ttl", &obj);
++ INSIST(result == ISC_R_SUCCESS);
++ view->minncachettl = cfg_obj_asuint32(obj);
++ if (view->minncachettl > 7 * 24 * 3600)
++ view->minncachettl = 7 * 24 * 3600;
++
+ /*
+ * Configure the view's cache.
+ *
+diff --git a/bin/tests/named.conf b/bin/tests/named.conf
+index 5673e98..34435b6 100644
+--- a/bin/tests/named.conf
++++ b/bin/tests/named.conf
+@@ -46,6 +46,7 @@ options {
+ memstatistics-file "named.memstats"; // _PATH_MEMSTATS
+
+ max-cache-ttl 999;
++ min-cache-ttl 666;
+ auth-nxdomain yes; // always set AA on NXDOMAIN.
+ // don't set this to 'no' unless
+ // you know what you're doing -- older
+@@ -148,6 +149,7 @@ options {
+ min-refresh-time 777;
+
+ max-ncache-ttl 333;
++ min-ncache-ttl 222;
+ min-roots 15;
+ serial-queries 34;
+
+diff --git a/lib/dns/include/dns/ncache.h b/lib/dns/include/dns/ncache.h
+index 2942c26..c2e1e7b 100644
+--- a/lib/dns/include/dns/ncache.h
++++ b/lib/dns/include/dns/ncache.h
+@@ -56,12 +56,14 @@ ISC_LANG_BEGINDECLS
+
+ isc_result_t
+ dns_ncache_add(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+- dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
++ dns_rdatatype_t covers, isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ dns_rdataset_t *addedrdataset);
+ isc_result_t
+ dns_ncache_addoptout(dns_message_t *message, dns_db_t *cache,
+ dns_dbnode_t *node, dns_rdatatype_t covers,
+- isc_stdtime_t now, dns_ttl_t maxttl,
++ isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ bool optout, dns_rdataset_t *addedrdataset);
+ /*%<
+ * Convert the authority data from 'message' into a negative cache
+diff --git a/lib/dns/include/dns/view.h b/lib/dns/include/dns/view.h
+index 8e21298..3b3ecc9 100644
+--- a/lib/dns/include/dns/view.h
++++ b/lib/dns/include/dns/view.h
+@@ -153,6 +153,8 @@ struct dns_view {
+ bool sendcookie;
+ dns_ttl_t maxcachettl;
+ dns_ttl_t maxncachettl;
++ dns_ttl_t mincachettl;
++ dns_ttl_t minncachettl;
+ uint32_t nta_lifetime;
+ uint32_t nta_recheck;
+ char *nta_file;
+diff --git a/lib/dns/ncache.c b/lib/dns/ncache.c
+index c5078de..9cde098 100644
+--- a/lib/dns/ncache.c
++++ b/lib/dns/ncache.c
+@@ -45,7 +45,8 @@
+
+ static isc_result_t
+ addoptout(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+- dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
++ dns_rdatatype_t covers, isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ bool optout, bool secure,
+ dns_rdataset_t *addedrdataset);
+
+@@ -95,26 +96,29 @@ copy_rdataset(dns_rdataset_t *rdataset, isc_buffer_t *buffer) {
+
+ isc_result_t
+ dns_ncache_add(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+- dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
++ dns_rdatatype_t covers, isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ dns_rdataset_t *addedrdataset)
+ {
+- return (addoptout(message, cache, node, covers, now, maxttl,
++ return (addoptout(message, cache, node, covers, now, minttl, maxttl,
+ false, false, addedrdataset));
+ }
+
+ isc_result_t
+ dns_ncache_addoptout(dns_message_t *message, dns_db_t *cache,
+ dns_dbnode_t *node, dns_rdatatype_t covers,
+- isc_stdtime_t now, dns_ttl_t maxttl,
++ isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ bool optout, dns_rdataset_t *addedrdataset)
+ {
+- return (addoptout(message, cache, node, covers, now, maxttl,
++ return (addoptout(message, cache, node, covers, now, minttl, maxttl,
+ optout, true, addedrdataset));
+ }
+
+ static isc_result_t
+ addoptout(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+- dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
++ dns_rdatatype_t covers, isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ bool optout, bool secure,
+ dns_rdataset_t *addedrdataset)
+ {
+@@ -181,6 +185,8 @@ addoptout(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+ type == dns_rdatatype_nsec3) {
+ if (ttl > rdataset->ttl)
+ ttl = rdataset->ttl;
++ if (ttl < minttl)
++ ttl = minttl;
+ if (trust > rdataset->trust)
+ trust = rdataset->trust;
+ /*
+diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
+index 0abf4de..1d76504 100644
+--- a/lib/dns/resolver.c
++++ b/lib/dns/resolver.c
+@@ -564,7 +564,9 @@ static bool fctx_unlink(fetchctx_t *fctx);
+ static isc_result_t ncache_adderesult(dns_message_t *message,
+ dns_db_t *cache, dns_dbnode_t *node,
+ dns_rdatatype_t covers,
+- isc_stdtime_t now, dns_ttl_t maxttl,
++ isc_stdtime_t now,
++ dns_ttl_t minttl,
++ dns_ttl_t maxttl,
+ bool optout,
+ bool secure,
+ dns_rdataset_t *ardataset,
+@@ -5015,7 +5017,7 @@ validated(isc_task_t *task, isc_event_t *event) {
+ ttl = 0;
+
+ result = ncache_adderesult(fctx->rmessage, fctx->cache, node,
+- covers, now, ttl, vevent->optout,
++ covers, now, fctx->res->view->minncachettl, ttl, vevent->optout,
+ vevent->secure, ardataset, &eresult);
+ if (result != ISC_R_SUCCESS)
+ goto noanswer_response;
+@@ -5480,6 +5482,12 @@ cache_name(fetchctx_t *fctx, dns_name_t *name, dns_adbaddrinfo_t *addrinfo,
+ rdataset->ttl = res->view->maxcachettl;
+ }
+
++ /*
++ * Enforce configured minimum cache TTL.
++ */
++ if (rdataset->ttl < res->view->mincachettl)
++ rdataset->ttl = res->view->mincachettl;
++
+ /*
+ * Mark the rdataset as being prefetch eligible.
+ */
+@@ -5868,7 +5876,8 @@ cache_message(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo, isc_stdtime_t now)
+ */
+ static isc_result_t
+ ncache_adderesult(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+- dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
++ dns_rdatatype_t covers, isc_stdtime_t now,
++ dns_ttl_t minttl, dns_ttl_t maxttl,
+ bool optout, bool secure,
+ dns_rdataset_t *ardataset, isc_result_t *eresultp)
+ {
+@@ -5881,10 +5890,10 @@ ncache_adderesult(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
+ }
+ if (secure)
+ result = dns_ncache_addoptout(message, cache, node, covers,
+- now, maxttl, optout, ardataset);
++ now, minttl, maxttl, optout, ardataset);
+ else
+ result = dns_ncache_add(message, cache, node, covers, now,
+- maxttl, ardataset);
++ minttl, maxttl, ardataset);
+ if (result == DNS_R_UNCHANGED || result == ISC_R_SUCCESS) {
+ /*
+ * If the cache now contains a negative entry and we
+@@ -6059,7 +6068,8 @@ ncache_message(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo,
+ ttl = 0;
+
+ result = ncache_adderesult(fctx->rmessage, fctx->cache, node,
+- covers, now, ttl, false,
++ covers, now, ttl,
++ fctx->res->view->minncachettl, false,
+ false, ardataset, &eresult);
+ if (result != ISC_R_SUCCESS)
+ goto unlock;
+diff --git a/lib/isccfg/namedconf.c b/lib/isccfg/namedconf.c
+index cd797a6..fdaf8ff 100644
+--- a/lib/isccfg/namedconf.c
++++ b/lib/isccfg/namedconf.c
+@@ -1780,6 +1780,8 @@ view_clauses[] = {
+ { "max-recursion-queries", &cfg_type_uint32, 0 },
+ { "max-udp-size", &cfg_type_uint32, 0 },
+ { "message-compression", &cfg_type_boolean, 0 },
++ { "min-cache-ttl", &cfg_type_uint32, 0 },
++ { "min-ncache-ttl", &cfg_type_uint32, 0 },
+ { "min-roots", &cfg_type_uint32, CFG_CLAUSEFLAG_NOTIMP },
+ { "minimal-any", &cfg_type_boolean, 0 },
+ { "minimal-responses", &cfg_type_minimal, 0 },
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-03 09:59:27 +0000