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A simple python tun/tap udp tunnel example
# Simple linux tun/tap device example tunnel over udp
# create tap device with ip tuntap add device0 tap
# set ip address on it and run tap-linux on that device and set desitation ip
# run same on another node, changing dst ip to first node
import fcntl
import struct
import os
import socket
import threading
import sys
TUNSETIFF = 0x400454ca
TUNSETOWNER = TUNSETIFF + 2
IFF_TUN = 0x0001
IFF_TAP = 0x0002
IFF_NO_PI = 0x1000
def udp_send(dst, packet):
print "udp_send"
sock.sendto(packet, (dst, 40000))
def recv():
ss = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
ss.bind(("0.0.0.0", 40000))
while True:
data, addr = ss.recvfrom(1024)
print "udp_recv"
os.write(tun.fileno(), data)
if __name__ == "__main__":
if len(sys.argv) < 3:
print "Usage: tap-linux.py <tap_interface> <dst_address_of_tunnel>"
sys.exit(1)
iface = sys.argv[1]
dst = sys.argv[2]
print "Working on %s inteface, destination address %s:40000 udp" % (iface, dst)
tun = open('/dev/net/tun', 'r+b')
ifr = struct.pack('16sH', iface, IFF_TAP | IFF_NO_PI)
fcntl.ioctl(tun, TUNSETIFF, ifr)
fcntl.ioctl(tun, TUNSETOWNER, 1000)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
t = threading.Thread(target=recv)
try:
t.start()
while True:
packet = os.read(tun.fileno(), 2048)
if True:
udp_send(dst, packet)
except KeyboardInterrupt:
print "Terminating ..."
os._exit(0)
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