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95 lines
2.7 KiB
Perl
95 lines
2.7 KiB
Perl
#!/usr/bin/perl
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#
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# Copyright (C) 2000, 2001, 2004, 2007, 2009, 2012, 2016 Internet Systems Consortium, Inc. ("ISC")
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# $Id: ans.pl,v 1.12 2009/11/04 02:15:30 marka Exp $
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#
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# Ad hoc name server
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#
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use IO::File;
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use IO::Socket;
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use Net::DNS;
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use Net::DNS::Packet;
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my $sock = IO::Socket::INET->new(LocalAddr => "10.53.0.3",
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LocalPort => 5300, Proto => "udp") or die "$!";
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my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!";
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print $pidf "$$\n" or die "cannot write pid file: $!";
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$pidf->close or die "cannot close pid file: $!";
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sub rmpid { unlink "ans.pid"; exit 1; };
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$SIG{INT} = \&rmpid;
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$SIG{TERM} = \&rmpid;
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for (;;) {
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$sock->recv($buf, 512);
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print "**** request from " , $sock->peerhost, " port ", $sock->peerport, "\n";
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my $packet;
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if ($Net::DNS::VERSION > 0.68) {
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$packet = new Net::DNS::Packet(\$buf, 0);
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$@ and die $@;
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} else {
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my $err;
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($packet, $err) = new Net::DNS::Packet(\$buf, 0);
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$err and die $err;
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}
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print "REQUEST:\n";
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$packet->print;
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$packet->header->qr(1);
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$packet->header->aa(1);
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my @questions = $packet->question;
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my $qname = $questions[0]->qname;
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if ($qname eq "badcname.example.net") {
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$packet->push("answer",
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new Net::DNS::RR($qname .
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" 300 CNAME badcname.example.org"));
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} elsif ($qname eq "foo.baddname.example.net") {
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$packet->push("answer",
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new Net::DNS::RR("baddname.example.net" .
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" 300 DNAME baddname.example.org"));
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} elsif ($qname eq "foo.gooddname.example.net") {
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$packet->push("answer",
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new Net::DNS::RR("gooddname.example.net" .
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" 300 DNAME gooddname.example.org"));
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} elsif ($qname eq "goodcname.example.net") {
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$packet->push("answer",
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new Net::DNS::RR($qname .
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" 300 CNAME goodcname.example.org"));
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} elsif ($qname eq "cname.sub.example.org") {
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$packet->push("answer",
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new Net::DNS::RR($qname .
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" 300 CNAME ok.sub.example.org"));
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} elsif ($qname eq "ok.sub.example.org") {
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$packet->push("answer",
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new Net::DNS::RR($qname . " 300 A 192.0.2.1"));
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} elsif ($qname eq "www.dname.sub.example.org") {
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$packet->push("answer",
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new Net::DNS::RR("dname.sub.example.org" .
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" 300 DNAME ok.sub.example.org"));
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} elsif ($qname eq "www.ok.sub.example.org") {
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$packet->push("answer",
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new Net::DNS::RR($qname . " 300 A 192.0.2.1"));
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} else {
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$packet->push("answer", new Net::DNS::RR("www.example.com 300 A 1.2.3.4"));
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}
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$sock->send($packet->data);
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print "RESPONSE:\n";
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$packet->print;
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print "\n";
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}
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