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Re: [PATCH] Don't use gethostbyaddr to determine canonical name

From: Ulrich Drepper <drepper at gmail dot com>
To: Andreas Schwab <schwab at redhat dot com>
Cc: libc-hacker at sourceware dot org
Date: Mon, 4 Jul 2011 17:53:57 -0400
Subject: Re: [PATCH] Don't use gethostbyaddr to determine canonical name
References: <m3y60uf1sg.fsf@redhat.com> <BANLkTikyEmO_LE51K87Y-XVQkgkYmiskag@mail.gmail.com><m38vsru0rd.fsf@redhat.com>

On Fri, Jun 24, 2011 at 03:49, Andreas Schwab <schwab@redhat.com> wrote:
> $ getent ahosts www.google.de | head -1
> 2a00:1450:8007::6a STREAM www.l.google.com
> $ getent ahostsv4 www.google.de | head -1
> 74.125.39.106 Â STREAM fx-in-f106.1e100.net

I cannot reproduce this.  Must have been on IPv6-day!?

What is the exact situation?  The patch isn't correct.  If anything is
wrong then it might be that we need to use the gethostbyname-based
implementation in even fewer situations or the getcanon implementation
has a problem.

The 1e100.net address obviously also belongs to Google.  Therefore I'm
not really sure there is a problem.  They might have directed IPv4 and
IPv6 traffic to completely different machines.

Follow-Ups:
- Re: [PATCH] Don't use gethostbyaddr to determine canonical name
  - From: Andreas Schwab

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