Debian Bug report logs - #455762
[libc6] gethostbyname fails on IPv6 addresses

Reply or subscribe to this bug.

Toggle useless messages

Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Adam Majer <adamm@zombino.com>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: [libc6] gethostbyname fails on IPv6 addresses

Date: Tue, 11 Dec 2007 11:55:59 -0600

Package: libc6
Version: 2.7-4
Severity: normal

The following test case fails for simple ::1 ip address. According to
documentation, IPv6 and IPv4 addresses specified should be returned
without the need to resolve them. This appears to happen when
127.0.0.1 is used.

Furthermore, gethostbyname( "ip6-localhost" ) also seems to work.

No explicit IPv6 address seems to work.



#include <netdb.h>
#include <stdio.h>
int main() 
{
   if( gethostbyname( "::1" ) == NULL )
      printf( "error: %d\n", (int)h_errno );
   else
      printf( "found\n" );
}


-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (5, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-3-k7 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libc6 depends on:
ii  libgcc1                       1:4.2.2-4  GCC support library

libc6 recommends no packages.

-- debconf information excluded

Message #10 received at 455762@bugs.debian.org (full text, mbox, reply):

From: Lionel Elie Mamane <lionel@mamane.lu>

To: 455762@bugs.debian.org, 455762-subscribe@bugs.debian.org

Subject: gethostbyname fails on IPv6 addresses, even with "options inet6"

Date: Sun, 23 Mar 2008 15:22:47 +0100

Adam Majer wrote:

> According to documentation, IPv6 and IPv4 addresses specified should
> be returned without the need to resolve them. No explicit IPv6
> address seems to work.

I reproduced this bug even with "options inet6" in /etc/resolv.conf

With the "options inet6", symbolic names that resolve to an AAAA entry
work, though. As do IPv6 entries in /etc/hosts (such as
"ip6-localhost").

On the other hand, the system seems to have some intelligence, because
(without "options inet6"), ip6-localhost returns 127.0.0.1, and that
ain't from DNS.

-- 
Lionel

Send a report that this bug log contains spam.