From: Rafał Miłecki <rafal@milecki.pl>
Date: Mon, 13 Feb 2017 07:43:27 +0000 (+0100)
Subject: Set TTL to the new value when updating cached service entry
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fmdnsd.git;a=commitdiff_plain;h=745d040b814cade77d847945a8e3f87d37ac09f3

Set TTL to the new value when updating cached service entry

In the simplest case host may change TTL to some different value. It's
the most important for the goodbye packets though.

Consider situation when host (for which we have no no cached entries)
restarts. First it sends goodbye with TTL 0 (we cache it), then seconds
later it announces with standard TTL values (but we keep TTL 0).
It results in wrong cache state and could cause dropping valid entries.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: John Crispin <john@phrozen.org>
---

diff --git a/cache.c b/cache.c
index fa32465..6bf0d26 100644
--- a/cache.c
+++ b/cache.c
@@ -143,6 +143,7 @@ cache_service(struct interface *iface, char *entry, int hlen, int ttl)
 		if (!strcmp(s->entry, entry)) {
 			s->refresh = 50;
 			s->time = monotonic_time();
+			s->ttl = ttl;
 			return s;
 		}