1#!/usr/bin/perl -w 2# 3# Copyright (C) Internet Systems Consortium, Inc. ("ISC") 4# 5# This Source Code Form is subject to the terms of the Mozilla Public 6# License, v. 2.0. If a copy of the MPL was not distributed with this 7# file, you can obtain one at https://mozilla.org/MPL/2.0/. 8# 9# See the COPYRIGHT file distributed with this work for additional 10# information regarding copyright ownership. 11 12use IO::File; 13use IO::Socket; 14use Net::DNS; 15use Net::DNS::Packet; 16 17my $localport = int($ENV{'PORT'}); 18if (!$localport) { $localport = 5300; } 19 20my $sock = IO::Socket::INET->new(LocalAddr => "10.53.0.7", 21 LocalPort => $localport, Proto => "udp") or die "$!"; 22 23my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!"; 24print $pidf "$$\n" or die "cannot write pid file: $!"; 25$pidf->close or die "cannot close pid file: $!"; 26sub rmpid { unlink "ans.pid"; exit 1; }; 27 28$SIG{INT} = \&rmpid; 29$SIG{TERM} = \&rmpid; 30 31STDOUT->autoflush(1); 32 33print "Net::DNS::VERSION => $Net::DNS::VERSION\n"; 34 35for (;;) { 36 $sock->recv($buf, 512); 37 38 print "**** request from " , $sock->peerhost, " port ", $sock->peerport, "\n"; 39 40 my $packet; 41 42 if ($Net::DNS::VERSION > 0.68) { 43 $packet = new Net::DNS::Packet(\$buf, 0); 44 $@ and die $@; 45 } else { 46 my $err; 47 ($packet, $err) = new Net::DNS::Packet(\$buf, 0); 48 $err and die $err; 49 } 50 51 print "REQUEST:\n"; 52 $packet->print; 53 54 $packet->header->qr(1); 55 $packet->header->opcode(5); 56 57 my @questions = $packet->question; 58 my $qname = $questions[0]->qname; 59 my $qtype = $questions[0]->qtype; 60 $packet->push("update", rr_del("$qname SOA")); 61 62 print "RESPONSE:\n"; 63 $packet->print; 64 65 $sock->send($packet->data); 66} 67