[Bug libc/5479] New: gethostbyname() fails on IPv6 numeric addresses

[Bug libc/5479] New: gethostbyname() fails on IPv6 numeric addresses

[aurelien at aurel32 dot net]

gethostbyname() is able to do IPv6 resolutions (eg. ip6-localhost), and is 
working on IPv4 numeric addresses by returning the address unchanged. 

However, it doesn't work on IPv6 numeric addresses. In that cases, it returns a 
NULL pointer, while I think it should return the IPv6 numeric address 
unchanged.

-- 
           Summary: gethostbyname() fails on IPv6 numeric addresses
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: aurelien at aurel32 dot net
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=5479

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[Bug libc/5479] gethostbyname() fails on IPv6 numeric addresses

[ismail at pardus dot org dot tr]

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           What    |Removed                     |Added
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                 CC|                            |ismail at pardus dot org dot
                   |                            |tr


http://sourceware.org/bugzilla/show_bug.cgi?id=5479

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[Bug libc/5479] gethostbyname() fails on IPv6 numeric addresses

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-04-07 18:19 -------
What exactly doesn't work?  The only thing I see not being done is handling
IPv6-mapped-IPv4 addresses for AF_INET queries.  That's hardly worth the
complications, people have to jump through hoops to create such strings.

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           What    |Removed                     |Added
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             Status|NEW                         |WAITING


http://sourceware.org/bugzilla/show_bug.cgi?id=5479

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[Bug libc/5479] gethostbyname() fails on IPv6 numeric addresses

[aurelien at aurel32 dot net]

------- Additional Comments From aurelien at aurel32 dot net  2008-04-07 18:40 -------
Please consider the following testcase:

#include <netdb.h>
#include <stdio.h>

int main()
{
   if( gethostbyname( "127.0.0.1" ) == NULL )
      printf( "error: %d\n", (int)h_errno );
   else
      printf( "found\n" );

   if( gethostbyname( "::1" ) == NULL )
      printf( "error: %d\n", (int)h_errno );
   else
      printf( "found\n" );
}

Numeric IPv4 addresses are left unchanged. That's not the case for IPv6 
addresses.

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           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW


http://sourceware.org/bugzilla/show_bug.cgi?id=5479

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[Bug libc/5479] gethostbyname() fails on IPv6 numeric addresses

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-04-07 19:07 -------
(In reply to comment #2)
> Please consider the following testcase:
> [...]

That's not worth the extra complexity.  This never worked, people hardly ever
use mapped addresses, and gethostby* should not *EVER* be used in the first
place.  Anything to get people away from gethostby* is a good thing.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


http://sourceware.org/bugzilla/show_bug.cgi?id=5479

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