[Bug 4417] New: DnsResolver.pm/connect_sock() fails on IPv6 resolver address

[bu...@bugzilla.spamassassin.org]

http://bugzilla.spamassassin.org/show_bug.cgi?id=4417

           Summary: DnsResolver.pm/connect_sock() fails on IPv6 resolver
                    address
           Product: Spamassassin
           Version: SVN Trunk (Latest Devel Version)
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Libraries
        AssignedTo: dev@spamassassin.apache.org
        ReportedBy: Mark.Martinec@ijs.si


The code section in DnsResolver.pm/connect_sock:  
  
  $self->{sock} = $sock;  
  $self->{dest} = sockaddr_in($self->{res}->{port},  
            inet_aton($self->{res}->{nameservers}[0]));  
  
fails because $self->{res}->{nameservers}[0] is a string "::1"  
and inet_aton does not recognize IPv6 syntax.  
   
environment: spamassassin_20050620223535 (SVN),   
Net::DNS 0.51, IPv6-enabled OS, module IO::Socket::INET6 installed,   
/etc/resolv.conf contains entry: nameserver ::1   
  
The problem is easily repeatable:  
  $ spamassassin -tD   
  [50765] dbg: logger: adding facilities: all   
  [50765] dbg: logger: logging level is DBG   
  [50765] dbg: generic: SpamAssassin version 3.1.0-pre2-r191258   
  ...   
  [50765] dbg: dns: is Net::DNS::Resolver available? yes   
  [50765] dbg: dns: Net::DNS version: 0.51   
  [50765] warn: Use of uninitialized value in subroutine entry   
    at /usr/local/lib/perl5/5.8.6/mach/Socket.pm line 373.   
    Bad arg length for Socket::pack_sockaddr_in, length is 0,  
    should be 4   
    at /usr/local/lib/perl5/5.8.6/mach/Socket.pm line 373.  
  
It is interesting that this used to work (with IPv6 resolver)  
with somewhat older SVN version of SA (spamassassin_20050526104220).  
  
Note that the current Net::DNS 0.51 does support IPv6 resolvers  
when module IO::Socket::INET6 is installed. Seems to be the  
SA-supplied wrapper/replacement routines in DnsResolver.pm  
try to over-optimize what is available and working in Net::DNS. 
 
A workaround is to remove the "nameserver ::1" entry 
from /etc/resolv.conf and provide only IPv4 addresses 
of resolvers. Unfortunately this also affects other 
applications on the host. 
  
Regards  
   Mark



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[Bug 4417] DnsResolver.pm/connect_sock() fails on IPv6 resolver address

[bu...@bugzilla.spamassassin.org]

http://bugzilla.spamassassin.org/show_bug.cgi?id=4417


Mark.Martinec@ijs.si changed:

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




------- Additional Comments From Mark.Martinec@ijs.si  2005-06-21 16:06 -------
Sorry for a re-post, I accidentally resubmitted the same report. 
 
  Mark 

*** This bug has been marked as a duplicate of 4412 ***



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