#!/usr/bin/env python3

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 an interface, use --help for more info.")
    elif not options.new_mac:
        parser.error("[-] Please specify a new MAC, use --help for more info.")
    return options


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


options = get_arguments()
# change_mac(options.interface, options.new_mac)

ifconfig_result = subprocess.check_output(["ifconfig", options.interface])
print(ifconfig_result)

pattern = re.compile(r'([0-9a-f]{2}(?::[0-9a-f]{2}){5})', re.IGNORECASE)
mac_address_search_result = re.findall(p, ifconfig_result)

if mac_address_search_result:
    print(mac_address_search_result.group(0))
else:
    print("[-] Could not read MAC address")