import subprocess
import re
import optparse

def get_arguments():
    parser = optparse.OptionParser()
    parser.add_option('-i', '--interface', dest='interface', help="--help for more info")
    parser.add_option('-m', '--mac', dest='new_mac', help="--help for more info")
    (options, arguments) = parser.parse_args()
    return options

def change_mac(interface, new_mac):
    subprocess.call(['ifconfig', options.interface, 'down'])
    subprocess.call(['ifconfig', options.interface, 'hw', 'ether', options.new_mac])
    subprocess.call(['ifconfig', options.interface, 'up'])

def get_current_mac(interface):
    ifconfig_result = subprocess.check_output(['ifconfig', interface])
    mac_address_result = re.search(r'\w\w:\w\w:\w\w:\w\w:\w\w:\w\w', ifconfig_result)

    if mac_address_result:
        return mac_address_result.group(0)
    else:
        print('[-] Could not find MAC address')

options = get_arguments()
current_mac = get_current_mac(options.interface)

change_mac(options.interface, options.new_mac)

print(get_current_mac(options.interface))
print('Your new mac address is {}'.format(current_mac))