#! /usr/bin/env python
import subprocess
import dhcp_client

def create_viface(iface, viface, mac):
    if subprocess.call(['ip', 'link', 'add', 'link', iface, viface,
        'address', mac, 'type', 'macvlan']) != 0:
        return False
    if subprocess.call(['ip', 'link', 'dev', 'set', viface, 'up']) != 0:
        return False
    return True

def remove_viface(viface):
    return subprocess.call(['ip', 'link', 'del', viface]) == 0

iface = 'em1'
viface = 'vmac'
mac = '6c:3b:e5:1f:96:46'

if not create_viface(iface, viface, mac):
    print('Failed to create virtual interface')
    quit(1)

dh = dhcp_client.DhcpClient()
offer = dh.get_offer(mac, viface)

if offer == None:
    print('DHCP client timeout')
else:
    print(offer.str())

if not remove_viface(viface):
    printf('Failed to remove virtual interface')
    quit(4)