Re: lib/42405: libc: getaddrinfo() should perform T_A lookups before T_AAAA lookups, was: Resolver problems

[Hajimu UMEMOTO <ume%mahoroba.org@localhost>]

Hi,

>>>>> On Fri, 4 Dec 2009 15:45:16 +0000
>>>>> Matthias Scheler <tron%zhadum.org.uk@localhost> said:

tron> On Fri, Dec 04, 2009 at 10:19:36AM -0500, Greg Troxel wrote:
> I see.  Well, perhaps some kind of "don't do AAAA lookups" runtime
> config would help such people.

tron> Yes, that is the solution which is currently discussed. Ideally
tron> wand the following settings:

tron> Query AAAA first, then A
tron> Query A first, than AAAA
tron> Query only AAAA
tron> Query only A

> I wonder how many people are suffering from this ...

tron> I don't know that. But considering that some people get nervous when
tron> ftp(1) reports that IPv6 doesn't work before it tries IPv4 it
tron> might be good to have an option to look up A records first.

The getaddrinfo(3) queries A before AAAA on FreeBSD.  But,
getaddrinfo(3) still returns AAAA 1st by default.
You may want to see the following diff:

http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/net/getaddrinfo.c.diff?r1=1.53;r2=1.54

Sincerely,

--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume%mahoroba.org@localhost  ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/