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133 lines
3.2 KiB
Perl
133 lines
3.2 KiB
Perl
#!/usr/bin/perl
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#
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# Copyright (C) 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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#
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# See the COPYRIGHT file distributed with this work for additional
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# information regarding copyright ownership.
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# This is a tool for sending an arbitrary packet via UDP or TCP to an
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# arbitrary address and port. The packet is specified in a file or on
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# the standard input, in the form of a series of bytes in hexadecimal.
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# Whitespace is ignored, as is anything following a '#' symbol.
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#
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# For example, the following input would generate normal query for
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# isc.org/NS/IN":
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#
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# # QID:
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# 0c d8
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# # header:
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# 01 00 00 01 00 00 00 00 00 00
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# # qname isc.org:
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# 03 69 73 63 03 6f 72 67 00
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# # qtype NS:
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# 00 02
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# # qclass IN:
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# 00 01
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#
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# Note that we do not wait for a response for the server. This is simply
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# a way of injecting arbitrary packets to test server resposnes.
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#
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# Usage: packet.pl [-a <address>] [-p <port>] [-t (udp|tcp)] [filename]
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#
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# If not specified, address defaults to 127.0.0.1, port to 53, protocol
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# to udp, and file to stdin.
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#
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# XXX: Doesn't support IPv6 yet
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require 5.006.001;
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use strict;
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use Getopt::Std;
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use IO::File;
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use IO::Socket;
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sub usage {
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print ("Usage: packet.pl [-a address] [-p port] [-t (tcp|udp)] -d [file]\n");
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exit 1;
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}
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my %options={};
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getopts("a:dp:t:", \%options);
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my $addr = "127.0.0.1";
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$addr = $options{a} if defined $options{a};
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my $port = 53;
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$port = $options{p} if defined $options{p};
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my $proto = "udp";
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$proto = lc $options{t} if defined $options{t};
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usage if ($proto !~ /^(udp|tcp)$/);
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my $file = "STDIN";
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if (@ARGV >= 1) {
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my $filename = shift @ARGV;
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open FH, "<$filename" or die "$filename: $!";
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$file = "FH";
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}
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my $input = "";
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while (defined(my $line = <$file>) ) {
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chomp $line;
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$line =~ s/#.*$//;
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$input .= $line;
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}
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$input =~ s/\s+//g;
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my $data = pack("H*", $input);
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my $len = length $data;
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my $output = unpack("H*", $data);
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print ("sending: $output\n");
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my $sock = IO::Socket::INET->new(PeerAddr => $addr, PeerPort => $port,
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Proto => $proto,) or die "$!";
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my $bytes;
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if ($proto eq "udp") {
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$bytes = $sock->send($data);
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} else {
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$bytes = $sock->syswrite(pack("n", $len), 2);
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$bytes += $sock->syswrite($data, $len);
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}
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print ("sent $bytes bytes to $addr:$port\n");
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if (defined $options{d}) {
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use Net::DNS;
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use Net::DNS::Packet;
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my $rin;
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my $rout;
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$rin = '';
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vec($rin, fileno($sock), 1) = 1;
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select($rout = $rin, undef, undef, 1);
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if (vec($rout, fileno($sock), 1)) {{
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my $buf;
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if ($proto eq "udp") {
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$sock->recv($buf, 512);
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} else {
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my $n = $sock->sysread($buf, 2);
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last unless $n == 2;
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my $len = unpack("n", $buf);
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$n = $sock->sysread($buf, $len);
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last unless $n == $len;
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}
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my $response;
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if ($Net::DNS::VERSION > 0.68) {
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$response = new Net::DNS::Packet(\$buf, 0);
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$@ and die $@;
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} else {
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my $err;
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($response, $err) = new Net::DNS::Packet(\$buf, 0);
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$err and die $err;
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}
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$response->print;
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}}
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}
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$sock->close;
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close $file;
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