#! /usr/bin/env python
from scapy.all import *

import sys, getopt

def main(argv):
	srcIP = '192.168.1.2'
	dstIP = '192.168.1.1'
	dstPort = 22
	srcPort = 22
	Flaggs = 'R'

	try:
		opts, args = getopt.getopt(argv,"HS:D:x:y:A:f:")
   	except getopt.GetoptError:
		print '3.py -S <srcIP> -D <dstIP> -x <srcPort> -y <dstPort> -A <ackNum> -f <Flaggs>'
		sys.exit(2)
   	for opt, arg in opts:
		if opt in ("-H"):
			print '3.py -D <dstIP> -x <srcPort> -y <dstPort> -A <ackNum> -f <Flaggs>'
			sys.exit(0)
		if opt in ("-S"):
			srcIP = arg
		elif opt in ("-D"):
			dstIP = arg
		elif opt in ("-x"):
			srcPort = arg
		elif opt in ("-y"):
			dstPort = arg
		elif opt in ("-A"):
			ackNum = arg
		elif opt in ("-F"):
			Flaggs = arg


	a = IP(src = srcIP, dst = dstIP)/TCP(sport = int(srcPort), dport = int(dstPort), seq = int(ackNum) , flags = Flaggs)
	send(a)

if __name__ == "__main__":
   main(sys.argv[1:])