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- Phil Blundell: If you ask ares_gethostbyname() to do an AF_INET6 lookup and

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the target host has only A records, it automatically falls back to an
  AF_INET lookup and gives you the A results.  However, if the target host has
  a CNAME record, this behaviour is defeated since the original query does
  return some data even though ares_parse_aaa_reply() doesn't consider it
  relevant. Here's a small patch to make it behave the same with and without
  the CNAME.
This commit is contained in:
Daniel Stenberg 2008-07-03 11:32:35 +00:00
parent 82412f218f
commit e3b5673e98
2 changed files with 18 additions and 0 deletions
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9
ares/CHANGES
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@ -1,5 +1,14 @@
Changelog for the c-ares project
* Jul 3 2008 (Daniel Stenberg)
- Phil Blundell: If you ask ares_gethostbyname() to do an AF_INET6 lookup and
the target host has only A records, it automatically falls back to an
AF_INET lookup and gives you the A results. However, if the target host has
a CNAME record, this behaviour is defeated since the original query does
return some data even though ares_parse_aaa_reply() doesn't consider it
relevant. Here's a small patch to make it behave the same with and without
the CNAME.
* Jul 2 2008 (Yang Tse)
- Fallback to gettimeofday when monotonic clock is unavailable at run-time.

9
ares/ares_gethostbyname.c
View File

@ -176,6 +176,15 @@ static void host_callback(void *arg, int status, int timeouts,
else if (hquery->family == AF_INET6)
{
status = ares_parse_aaaa_reply(abuf, alen, &host, NULL, NULL);
if (status == ARES_ENODATA)
{
/* The query returned something (e.g. CNAME) but there were no
AAAA records. Try looking up A instead. */
hquery->family = AF_INET;
ares_search(hquery->channel, hquery->name, C_IN, T_A, host_callback,
hquery);
return;
}
if (host && channel->nsort)
sort6_addresses(host, channel->sortlist, channel->nsort);
}