#!/usr/bin/perl
# Copyright (c) 2011, Stephan Chenette and David Saunders
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.

use warnings;
use strict;

use Net::DNS;

my $DEBUG = 1;

my $google_public_dns = "8.8.8.8";

my $host = $ARGV[0];

if ( !defined $host ) {
    print STDERR "Usage: $0 HOST\n";
    exit 1;
}

print "host: " . $host . "\n" if ($DEBUG);

my $res = Net::DNS::Resolver->new;
$res->nameservers( $google_public_dns );

# Important to specify a 'TXT' query
my $query = $res->search( $host, 'TXT' ) or die "NULL\n";

foreach my $rr ( $query->answer ) {
    next unless $rr->type eq 'TXT';
    print "key:\n" . $rr->txtdata . "\n";
}