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

def main():

    pcap = sys.argv[1]

    obf = raw_input("Enter IP Address to Obfuscate: ")
    new = "1.1.1.1"

    packets = rdpcap(pcap)

    for p in packets:
	if not IP in p:
            continue

	src = p[IP].src
	dst = p[IP].dst

        if src == obf:
            print "Obfuscating Source Address"
            p[IP].src = new
            p[IP].chksum = None
            if TCP in p:
                p[TCP].chksum = None


        if dst == obf:
            print "Obfuscating Dest Address"
            p[IP].dst = new
            p[IP].chksum = None
            if TCP in p:
                p[TCP].chksum = None

    wrpcap("new.pcap", packets)

main()