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#!/usr/bin/perl -w
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
#
# Don't respond if the "norespond" file exists; otherwise respond to
# any A or AAAA query.
#
use IO::File;
use IO::Socket;
use Net::DNS;
use Net::DNS::Packet;
my $localport = int($ENV{'PORT'});
if (!$localport) { $localport = 5300; }
my $sock = IO::Socket::INET->new(LocalAddr => "10.53.0.4",
LocalPort => $localport, Proto => "udp") or die "$!";
my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!";
print $pidf "$$\n" or die "cannot write pid file: $!";
$pidf->close or die "cannot close pid file: $!";
sub rmpid { unlink "ans.pid"; exit 1; };
$SIG{INT} = \&rmpid;
$SIG{TERM} = \&rmpid;
for (;;) {
$sock->recv($buf, 512);
print "**** request from " , $sock->peerhost, " port ", $sock->peerport, "\n";
my $packet;
if ($Net::DNS::VERSION > 0.68) {
$packet = new Net::DNS::Packet(\$buf, 0);
$@ and die $@;
} else {
my $err;
($packet, $err) = new Net::DNS::Packet(\$buf, 0);
$err and die $err;
}
print "REQUEST:\n";
$packet->print;
$packet->header->qr(1);
my @questions = $packet->question;
my $qname = $questions[0]->qname;
my $qtype = $questions[0]->qtype;
my $donotrespond = 0;
if (-e 'norespond') {
$donotrespond = 1;
} else {
$packet->header->aa(1);
if ($qtype eq "A") {
$packet->push("answer",
new Net::DNS::RR($qname .
" 300 A 192.0.2.1"));
} elsif ($qtype eq "AAAA") {
$packet->push("answer",
new Net::DNS::RR($qname .
" 300 AAAA 2001:db8:beef::1"));
}
}
if ($donotrespond == 0) {
$sock->send($packet->data);
print "RESPONSE:\n";
$packet->print;
print "\n";
}
}
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