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Code Issues Releases Wiki Activity

ircd::net::dns: Enforce min ttl for cache entries; add conf option.

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This commit is contained in:
Jason Volk 2018-04-14 18:35:48 -07:00
parent 3b7816763e
commit f37176d698
2 changed files with 12 additions and 1 deletions
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1
include/ircd/net/dns.h
View file

@ -89,6 +89,7 @@ struct ircd::net::dns::opts
/// (internal) DNS cache
struct ircd::net::dns::cache
{
static conf::item<seconds> min_ttl;
static conf::item<seconds> clear_nxdomain;
std::multimap<std::string, rfc1035::record::A, std::less<>> A;

12
ircd/net.cc
View file

@ -2308,6 +2308,13 @@ ircd::net::dns::cache::clear_nxdomain
{ "default", 43200L },
};
decltype(ircd::net::dns::cache::min_ttl)
ircd::net::dns::cache::min_ttl
{
{ "name", "ircd.net.dns.cache.min_ttl" },
{ "default", 900L },
};
decltype(ircd::net::dns::prefetch_ipport)
ircd::net::dns::prefetch_ipport{[]
(std::exception_ptr, const auto &record)
@ -3135,7 +3142,10 @@ try
// indicating when they expire. This makes more sense for our caches.
const auto &now{ircd::time()};
for(size_t i(0); i < header.ancount; ++i)
an[i].ttl = now + an[i].ttl;
{
const uint &min_ttl(seconds(cache.min_ttl).count());
an[i].ttl = now + std::max(an[i].ttl, min_ttl);
}
}
// The callback to the user will be passed a vector_view of pointers