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#!/usr/bin/perl
# $Id: perldig 1815 2020-10-14 21:55:18Z willem $
=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 warnings;
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";
}
}