43 lines
956 B
Perl
43 lines
956 B
Perl
#!/usr/bin/perl
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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 $sock = IO::Socket::INET->new(LocalAddr => "10.53.0.2",
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LocalPort => 5300, Proto => "udp") or die "$!";
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my $pidf = new IO::File "ans.pid", "w" or die "cannot write pid file: $!";
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print $pidf "$$\n";
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$pidf->close;
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sub rmpid { unlink "ans.pid"; exit 1; };
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$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, $err) = new Net::DNS::Packet(\$buf, 0);
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$err and die $err;
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print "REQUEST:\n";
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$packet->print;
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$packet->header->qr(1);
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$packet->push("authority", new Net::DNS::RR("below.www.example.com 300 NS ns.below.www.example.com"));
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$packet->push("additional", new Net::DNS::RR("ns.below.www.example.com 300 A 10.53.0.3"));
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$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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