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--- bin/named/config.c.orig 2017-04-20 07:59:45 UTC
+++ bin/named/config.c
@@ -158,6 +158,8 @@ options {\n\
lame-ttl 600;\n\
servfail-ttl 1;\n\
max-ncache-ttl 10800; /* 3 hours */\n\
+ override-cache-ttl 0; /* do not override */\n\
+ min-cache-ttl 0; /* no minimal, zero is allowed */\n\
max-cache-ttl 604800; /* 1 week */\n\
transfer-format many-answers;\n\
max-cache-size 90%;\n\
--- bin/named/server.c.orig 2017-04-20 07:59:45 UTC
+++ bin/named/server.c
@@ -3751,6 +3751,16 @@ configure_view(dns_view_t *view, dns_vie
}
obj = NULL;
+ result = ns_config_get(maps, "override-cache-ttl", &obj);
+ INSIST(result == ISC_R_SUCCESS);
+ view->overridecachettl = cfg_obj_asuint32(obj);
+
+ 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, "max-cache-ttl", &obj);
INSIST(result == ISC_R_SUCCESS);
view->maxcachettl = cfg_obj_asuint32(obj);
--- lib/dns/include/dns/view.h.orig 2017-04-20 07:59:45 UTC
+++ lib/dns/include/dns/view.h
@@ -146,6 +146,8 @@ struct dns_view {
isc_boolean_t requestnsid;
isc_boolean_t sendcookie;
dns_ttl_t maxcachettl;
+ dns_ttl_t mincachettl;
+ dns_ttl_t overridecachettl;
dns_ttl_t maxncachettl;
isc_uint32_t nta_lifetime;
isc_uint32_t nta_recheck;
--- lib/dns/resolver.c.orig 2017-04-20 07:59:45 UTC
+++ lib/dns/resolver.c
@@ -5468,6 +5468,18 @@ cache_name(fetchctx_t *fctx, dns_name_t
}
/*
+ * Enforce the configure cache TTL override.
+ */
+ if (res->view->overridecachettl)
+ rdataset->ttl = res->view->overridecachettl;
+
+ /*
+ * Enforce the configure minimum cache TTL.
+ */
+ if (rdataset->ttl < res->view->mincachettl)
+ rdataset->ttl = res->view->mincachettl;
+
+ /*
* Enforce the configure maximum cache TTL.
*/
if (rdataset->ttl > res->view->maxcachettl)
--- lib/isccfg/namedconf.c.orig 2017-04-20 07:59:45 UTC
+++ lib/isccfg/namedconf.c
@@ -1882,6 +1882,8 @@ view_clauses[] = {
{ "nosit-udp-size", &cfg_type_uint32, CFG_CLAUSEFLAG_OBSOLETE },
{ "max-acache-size", &cfg_type_sizenodefault, 0 },
{ "max-cache-size", &cfg_type_sizeorpercent, 0 },
+ { "override-cache-ttl", &cfg_type_uint32, 0 },
+ { "min-cache-ttl", &cfg_type_uint32, 0 },
{ "max-cache-ttl", &cfg_type_uint32, 0 },
{ "max-clients-per-query", &cfg_type_uint32, 0 },
{ "max-ncache-ttl", &cfg_type_uint32, 0 },
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