From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 21 Aug 2015 20:47:06 +0000 (+0200)
Subject: resolved: add reference to negative caching RFC
X-Git-Tag: v225~35^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a18f3e59f887f27431759443374cd559fce729d;p=platform%2Fupstream%2Fsystemd.git

resolved: add reference to negative caching RFC
---

diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index eb51b4b..751e961 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -458,6 +458,10 @@ int dns_cache_put(
                 if (r > 0)
                         continue;
 
+                /* See https://tools.ietf.org/html/rfc2308, which
+                 * say that a matching SOA record in the packet
+                 * is used to to enable negative caching. */
+
                 r = dns_answer_find_soa(answer, q->keys[i], &soa);
                 if (r < 0)
                         goto fail;