#!/usr/local/bin/perl -w

# $Id: perldig 264 2005-04-06 09:16:15Z olaf $

=head1 NAME

perldig - Perl script to perform DNS queries

=head1 SYNOPSIS

C<perldig> [ C<@>I<nameserver> ] I<name> [ I<type> [ I<class> ] ]

=head1 DESCRIPTION

Performs a DNS query on the given name.  The record type

and class can also be specified; if left blank they default

to A and IN.

=head1 AUTHOR

Michael Fuhr <mike@fuhr.org>

=head1 SEE ALSO

L<perl(1)>, L<axfr>, L<check_soa>, L<check_zone>, L<mresolv>, L<mx>,

L<Net::DNS>

=cut

use strict;

use File::Basename;

use Net::DNS;

my $res = Net::DNS::Resolver->new;

if (@ARGV && ($ARGV[0] =~ /^@/)) {

	my $nameserver = shift;

	$nameserver =~ s/^@//;

	$res->nameservers($nameserver);

}

die "Usage: ", basename($0), " [ \@nameserver ] name [ type [ class ] ]\n"

	unless (@ARGV >= 1) && (@ARGV <= 3);

my ($name, $type, $class) = @ARGV;

$type  ||= "A";

$class ||= "IN";

if (uc($type) eq "AXFR") {

	my @rrs = $res->axfr($name, $class);

	if (@rrs) {

		foreach my $rr (@rrs) {

			$rr->print;

		}		

	} else {

		die "zone transfer failed: ", $res->errorstring, "\n";

	}

} else {

	my $answer = $res->send($name, $type, $class);

	if ($answer) {

		$answer->print;

	} else {

		die "query failed: ", $res->errorstring, "\n";

	}

}