#! /usr/bin/python

import os
from socket import *

MTU=1600
VLAN_ORI = 1
VLAN_DST = 2
IFACE = "vmnet1"
TAP = "/dev/tap0"


f=os.open(TAP, os.O_RDWR)

s=socket(AF_PACKET, SOCK_RAW, 0)
s.bind((IFACE, 0))

try:
    while 1:
        pkt=os.read(f, MTU)
        l8021q="\x81\x00\x00"+chr(VLAN_ORI)+"\x81\x00\x00"+chr(VLAN_DST)
        encap=pkt[2:14]+l8021q+pkt[14:]
        s.send(encap)
except KeyboardInterrupt:
    pass

s.close()
os.close(f)