MAC Address Changer

mac_changer.py

#!/usr/bin/env python

import subprocess
import optparse
import re

def get_arguments():
    parser = optparse.OptionParser()
    parser.add_option("-i", "--interface", dest="interface", help="Interface to change its MAC address")
    parser.add_option("-m", "--mac", dest="new_mac", help="New MAC address")
    (options, arguments) = parser.parse_args()
    if not options.interface:
        parser.error("[+] Please specify an interface, use --help for info.")
    elif not options.new_mac:
        parser.error("[+] Please specify an MAC address, use --help for info.")
    return options

def change_mac(interface, new_mac):
    print("[+] Changing MAC adress for " + interface + " to " + new_mac)
    subprocess.call(["ifconfig", interface, "down"])
    subprocess.call(["ifconfig", interface, "hw", "ether", new_mac])
    subprocess.call(["ifconfig", interface, "up"])


def get_current_mac(interface):
    ifconfig_result = subprocess.check_output(["ifconfig", interface])
    mac_address_search_result = re.search(r"\w\w:\w\w:\w\w:\w\w:\w\w:\w\w", ifconfig_result.decode("utf-8"))
    if mac_address_search_result:
        return mac_address_search_result.group(0)
    else:
        print("[-] Could not resolve MAC address")

def get_original_mac(interface):
    p1 = subprocess.Popen(['dmesg'], stdout=subprocess.PIPE)
    p2 = subprocess.Popen(['grep', interface], stdin=p1.stdout, stdout=subprocess.PIPE)
    p1.stdout.close()
    original_mac_result, err = p2.communicate()
    original_mac_search_result = re.search(r"\w\w:\w\w:\w\w:\w\w:\w\w:\w\w", original_mac_result.decode("utf-8"))
    if original_mac_search_result:
        return original_mac_search_result.group(0)
    else:
        print("[-] Could not resolve ORIGINAL MAC address")


options = get_arguments()

original_mac = get_original_mac(options.interface)
print("Original MAC = " + str(original_mac))

current_mac = get_current_mac(options.interface)
print("Current MAC = " + str(current_mac))

change_mac(options.interface, options.new_mac)

current_mac = get_current_mac(options.interface)
if current_mac == options.new_mac:
    print("[+] MAC address was changed successfully.")
else:
    print("[-] MAC address did NOT get changed.")