mac_changer.py

import subprocess
import optparse
import re

def get_arguments():
    parser = optparse.OptionParser()
    parser.add_option("-i", "--interface", dest="interface", help="Interface to change 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 the Valid Interface, Use --help for more info.")
    elif not options.new_mac:
        parser.error("[-] Please specify the MAC address, Use --help for more info.")
    return options

def change_mac(interface, new_mac):
    print("[+] Changing MAC address 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)
    if mac_address_search_result:
        return mac_address_search_result.group(0)
    else:
        print("[-] Could not read MAC address.")

options = get_arguments()
current_mac = get_current_mac(options.interface)
print("Current MAC = " + str(current_mac))
if current_mac == None:
    print("\n[-] The Interface '" +options.interface+ "' does not have MAC address.")
    print("\n[-] Error: Invalid Interface to Change MAC address.")
else:
    change_mac(options.interface, options.new_mac)
    current_mac = get_current_mac(options.interface)
    if current_mac == options.new_mac:
        print("[+] MAC address of " +options.interface+ " was successfully changed to " +current_mac)
        print("[+] New MAC\t: "+str(current_mac))

    else:
        print("[-] MAC address of " +options.interface+ " did not changed.")
        print("[-] Error: Invalid MAC Address")