import struct
import sys
import os
import time

from fcntl import ioctl

IFF_TUN                = 0x0001   # tunnel IP packets
IFF_TAP                = 0x0002   # tunnel ethernet frames
IFF_NO_PI              = 0x1000   # don't pass extra packet info

tun = os.open("/dev/net/tun", os.O_RDWR)
ifs = ioctl(tun, 0x400454ca, struct.pack("16sH", "tun%d", IFF_TUN | IFF_NO_PI))
ifname = ifs[:16].strip("\x00")

os.system("ifconfig %s 192.168.1.1" % (ifname,))
os.system("route add -net 192.168.1.0 netmask 255.255.255.0 dev %s" % (ifname,))

while 1:
   print os.read(tun, 8192)