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#!/usr/bin/env perl
# 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.
use strict;
use warnings;
use IO::File;
use Getopt::Long;
use Net::DNS::Nameserver;
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;
my $count = 0;
my $localaddr = "10.53.0.7";
my $localport = int($ENV{'PORT'});
if (!$localport) { $localport = 5300; }
my $verbose = 0;
sub reply_handler {
my ($qname, $qclass, $qtype, $peerhost, $query, $conn) = @_;
my ($rcode, @ans, @auth, @add);
print ("request: $qname/$qtype\n");
STDOUT->flush();
$count += 1;
if ($qname eq "count" ) {
if ($qtype eq "TXT") {
my ($ttl, $rdata) = (0, "$count");
my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
push @ans, $rr;
print ("\tcount: $count\n");
}
$rcode = "NOERROR";
} elsif ($qname eq "reset") {
$count = 0;
$rcode = "NOERROR";
} else {
$rcode = "REFUSED";
}
# mark the answer as authoritative (by setting the 'aa' flag
return ($rcode, \@ans, \@auth, \@add, { aa => 1 });
}
GetOptions(
'port=i' => \$localport,
'verbose!' => \$verbose,
);
my $ns = Net::DNS::Nameserver->new(
LocalAddr => $localaddr,
LocalPort => $localport,
ReplyHandler => \&reply_handler,
Verbose => $verbose,
);
$ns->main_loop;
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