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#!/usr/bin/perl
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
# This is a tool for sending an arbitrary packet via UDP or TCP to an
# arbitrary address and port. The packet is specified in a file or on
# the standard input, in the form of a series of bytes in hexadecimal.
# Whitespace is ignored, as is anything following a '#' symbol.
#
# For example, the following input would generate normal query for
# isc.org/NS/IN":
#
# # QID:
# 0c d8
# # header:
# 01 00 00 01 00 00 00 00 00 00
# # qname isc.org:
# 03 69 73 63 03 6f 72 67 00
# # qtype NS:
# 00 02
# # qclass IN:
# 00 01
#
# Note that we do not wait for a response for the server. This is simply
# a way of injecting arbitrary packets to test server resposnes.
#
# Usage: packet.pl [-a <address>] [-d] [-p <port>] [-t (udp|tcp)] [-r <repeats>] [filename]
#
# Options:
# -a <address>: specify address (XXX: no IPv6 support yet)
# -p <port>: specify port
# -t <protocol>: specify UDP or TCP
# -r <num>: send packet <num> times
# -d: dump response packets
#
# If not specified, address defaults to 127.0.0.1, port to 53, protocol
# to udp, and file to stdin.
require 5.006.001;
use strict;
use Getopt::Std;
use IO::File;
use IO::Socket;
sub usage {
print ("Usage: packet.pl [-a address] [-d] [-p port] [-t (tcp|udp)] [-r <repeats>] [file]\n");
exit 1;
}
my $sock;
my $proto;
sub dumppacket {
use Net::DNS;
use Net::DNS::Packet;
my $rin;
my $rout;
$rin = '';
vec($rin, fileno($sock), 1) = 1;
select($rout = $rin, undef, undef, 1);
if (vec($rout, fileno($sock), 1)) {
my $buf;
if ($proto eq "udp") {
$sock->recv($buf, 512);
} else {
my $n = $sock->sysread($buf, 2);
return unless $n == 2;
my $len = unpack("n", $buf);
$n = $sock->sysread($buf, $len);
return unless $n == $len;
}
my $response;
if ($Net::DNS::VERSION > 0.68) {
$response = new Net::DNS::Packet(\$buf, 0);
$@ and die $@;
} else {
my $err;
($response, $err) = new Net::DNS::Packet(\$buf, 0);
$err and die $err;
}
$response->print;
}
}
my %options={};
getopts("a:dp:t:r:", \%options);
my $addr = "127.0.0.1";
$addr = $options{a} if defined $options{a};
my $port = 53;
$port = $options{p} if defined $options{p};
$proto = "udp";
$proto = lc $options{t} if defined $options{t};
usage if ($proto !~ /^(udp|tcp)$/);
my $repeats = 1;
$repeats = $options{r} if defined $options{r};
my $file = "STDIN";
if (@ARGV >= 1) {
my $filename = shift @ARGV;
open FH, "<$filename" or die "$filename: $!";
$file = "FH";
}
my $input = "";
while (defined(my $line = <$file>) ) {
chomp $line;
$line =~ s/#.*$//;
$input .= $line;
}
$input =~ s/\s+//g;
my $data = pack("H*", $input);
my $len = length $data;
my $output = unpack("H*", $data);
print ("sending $repeats time(s): $output\n");
$sock = IO::Socket::INET->new(PeerAddr => $addr, PeerPort => $port,
Blocking => 0,
Proto => $proto,) or die "$!";
STDOUT->autoflush(1);
my $bytes = 0;
while ($repeats > 0) {
if ($proto eq "udp") {
$bytes += $sock->send($data);
} else {
$bytes += $sock->syswrite(pack("n", $len), 2);
$bytes += $sock->syswrite($data, $len);
}
$repeats = $repeats - 1;
if ($repeats % 1000 == 0) {
print ".";
}
}
$sock->shutdown(SHUT_WR);
if (defined $options{d}) {
dumppacket;
}
$sock->close;
close $file;
print ("\nsent $bytes bytes to $addr:$port\n");
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