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#!/usr/bin/perl
#
# Copyright (C) 2000 Internet Software Consortium.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
# FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# $Id: ans.pl,v 1.4 2000/11/18 02:57:17 bwelling Exp $
#
# Ad hoc name server
#
use IO::File;
use IO::Socket;
use Net::DNS;
use Net::DNS::Packet;
my $sock = IO::Socket::INET->new(LocalAddr => "10.53.0.3",
LocalPort => 5300, Proto => "udp") or die "$!";
my $pidf = new IO::File "ans.pid", "w" or die "cannot write pid file: $!";
print $pidf "$$\n";
$pidf->close;
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, $err) = new Net::DNS::Packet(\$buf, 0);
$err and die $err;
print "REQUEST:\n";
$packet->print;
$packet->header->qr(1);
$packet->push("answer", new Net::DNS::RR("www.example.com 300 A 1.2.3.4"));
$sock->send($packet->data);
print "RESPONSE:\n";
$packet->print;
print "\n";
}
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