#!/usr/bin/perl -Tw
#
#################################
#
# Copyright (C) 2001, Jon Hart <jhart@ccs.neu.edu>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
#################################
#
#
# Used to send icmp packets of various types/codes to any host from any host
#
# Requires:     Net::RawIP  (www.cpan.org)
#                       root
#
#
# (jhart@ccs.neu.edu) work/school
#       and/or   
# (warchild@spoofed.org) home/play
#################################
use strict;
use diagnostics;
use Net::RawIP;
use Tie::RefHash;
use Getopt::Long;
$ENV{'PATH'} = "/usr/bin:/bin";
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
# get our options in place
GetOptions(     "src=s"		=>	\(my $opt_saddr),
                "dest=s"		=>	\(my $opt_daddr),
			 "type=i"		=>	\(my $opt_icmptype),
			 "code=i"		=>	\(my $opt_icmpcode),
			 "num=i"		=>	\(my $opt_num),
			 "delay=i"	=>	\(my $opt_delay), 
                "help"		=>	\(my $opt_help),
                "debug"		=>	\(my $opt_debug)) or die "$!\n";
for(1..($opt_num ? $opt_num : 5)) {
	&send($opt_saddr, $opt_daddr);
	#sleep($opt_delay ? $opt_delay : 1);
	if( defined($opt_delay)) {
		sleep($opt_delay);
	} else {
		sleep(1);
	}
}
sub send {
my $packet = new Net::RawIP{icmp =>{}};
my %ip_hdr;
my %icmp_hdr = &icmp_gen;
$ip_hdr{saddr} = shift;
$ip_hdr{daddr} = shift;
$ip_hdr{tos} = 0;
$ip_hdr{ttl} = 255;
$ip_hdr{version} = 4;
$packet->set({ip => \%ip_hdr, icmp => \%icmp_hdr});
if (defined($opt_debug)) {
	print "#"x20, "\n";
	print "###IP Header###\n";
	foreach (sort keys %ip_hdr) { print "$_ = $ip_hdr{$_}\n"; }
	print "###ICMP Header###\n";
	foreach (sort keys %icmp_hdr) { print "$_ = $icmp_hdr{$_}\n"; }
	print "#"x20, "\n";
}
$packet->send;
}
sub icmp_gen {
	# Net::RawIP requires at a minimum, one of the following:
	#	gateway (int)
	#	id (short) and sequence (short)
	#	mtu (short) and unused (short) 
	my %icmp_packet;
	my %ip_header;
	tie %icmp_packet, 'Tie::RefHash';
	tie %ip_header, 'Tie::RefHash';
	$icmp_packet{type} = $opt_icmptype ? $opt_icmptype : int rand(2**8);
	$icmp_packet{code} = $opt_icmpcode ? $opt_icmpcode : int rand(2**8);
	# generate the original IP header (128-bit) + 64-bit dgram
	# the IP header doesn't have to make sense, it just has to be
	# syntactically correct
	#############################
	# IP header
	# int rand(5) might also work
	#$ip_header{version} =  substr(unpack("B32", pack("N", 2)), -4);
	$ip_header{version} = 2;
	# the size in 32-bit words.  min size is 5, max is 6. pick one.
	#$ip_header{ihl} = substr(unpack("B32", pack("N", 5 + int rand(2))), -4);
	$ip_header{ihl} = 5 + int rand(2);
	#$ip_header{tos} = substr(unpack("B32", pack("N", int rand(2**8))), -8);
	$ip_header{tos} = int rand(2**8);
	#$ip_header{tot_len} =  substr(unpack("B32", pack("N", int rand(2**16))), -16);
	$ip_header{tot_len} = int rand(2**16);
	#$ip_header{id} = substr(unpack("B32", pack("N", int rand(2**16))), -16);
	$ip_header{id} = int rand(2**16);
	#$ip_header{frag_off} = substr(unpack("B32", pack("N", int rand(2**13))), -13);
	$ip_header{frag_off} = int rand(2**13);
	#$ip_header{ttl} = substr(unpack("B32", pack("N", int rand(2**8))), -8);
	$ip_header{ttl} = int rand(2**8);
	# either pick a random protocol
	#$ip_header{protocol} = substr("B32", pack("N", int rand(2**8))), -8);
	# or play nice and pick one of udp, tcp, icmp
	$ip_header{protocol} = ("1", "6", "17")[int rand(3)];
	# "the 16-bit ones complement of the ones complement of
	# all 16-bit words in the header".  sure.
	#$ip_header{check} = substr(unpack("B32", pack("N", int rand(2**16))), -16);
	# make up source/dest 
	$ip_header{saddr} = substr(unpack("B32", pack("N", int rand(2**32))), -32);
	$ip_header{daddr} = substr(unpack("B32", pack("N", int rand(2**32))), -32);
	my $ip_packet = new Net::RawIP;
	$ip_packet->set({ip => %ip_header});
	$icmp_packet{data} = \$ip_packet; 
	return %icmp_packet;
}