From: Daniel Berger <djberg96@...>
Date: 2006-09-29T09:37:08+09:00
Subject: Re: Using resolv to get the mailhost

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Daniel Berger wrote:
> Hi,
> 
> I'm trying to figure out a way to get the mailhost using the 'resolv'
> library, but I'm having trouble because it isn't documented.  What's a
> good analogue of this Perl script?
> 
> use strict;
> use Net::DNS;
> 
> my $resolv = Net::DNS::Resolver->new();
> my $packet = $resolv->search("mailhost");
> 
> foreach my $rr ($packet->answer){
>    $rr->print;
> }
> 
> # Prints the following (IP addresses changed to protect the guilty):
> 
> mailhost.foo.com.        900     IN      CNAME   mailgate.domain.com.
> mailgate.domain.com.    900     IN      A       1.2.3.4
> mailgate.domain.com.    900     IN      A       1.2.3.5
> mailgate.domain.com.    900     IN      A       1.2.3.6
> mailgate.domain.com.    900     IN      A       1.2.3.7
> mailgate.domain.com.    900     IN      A       1.2.3.8
> mailgate.domain.com.    900     IN      A       1.2.3.9
> 
> I'd really just like the first name of the first answer, i.e.
> "mailhost.foo.com".

It seems that I needed to put an explicit domain entry for foo.com in my
/etc/resolv.conf file.  Once I did that, then
Resolv.getaddress("mailhost") worked.

However, I'm confused as to why "host mailhost" and the Perl code above
worked without it, while the Ruby code required it.  Any insight
appreciated.

Regards,

Dan

PS - Solaris 10, btw.

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