Python读写tap设备

 #!/usr/bin/python

 import os
 import struct
 import fcntl
 import binascii

 TUNSETIFF = 0x400454ca
 IFF_TAP   = 0x0002

 fd = os.open("/dev/net/tun", os.O_RDWR)
 ifs = fcntl.ioctl(fd, TUNSETIFF, struct.pack("16sH", "t%d", IFF_TAP))
 tname = ifs[:16].strip("\x00")

 os.system("ip link set %s up" % (tname))
 os.system("brctl addif br0 %s" % tname)

 while True :
     data = os.read(fd, 1500)
     d = struct.unpack('!%ds' % len(data), data)[0]
     print binascii.hexlify(d)