From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 31 Jul 2014 22:57:19 +0000 (+0200)
Subject: resolved: don't bother caching negative RRs when the SOA TTL is 0 anyway
X-Git-Tag: v216~315
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=95dd6257a6befedb5b811f16d2cc4a0d8f147751

resolved: don't bother caching negative RRs when the SOA TTL is 0 anyway
---

diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index f7091f07b..40fb6c398 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -320,6 +320,8 @@ static int dns_cache_put_negative(DnsCache *c, DnsResourceKey *key, int rcode, u
                 return 0;
         if (key->type == DNS_TYPE_ANY)
                 return 0;
+        if (soa_ttl <= 0)
+                return 0;
 
         if (!IN_SET(rcode, DNS_RCODE_SUCCESS, DNS_RCODE_NXDOMAIN))
                 return 0;