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UDP Hole Punching test tool
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#!/usr/bin/env python | |
# | |
# udp_hole_punch_tester.py - UDP Hole Punching test tool | |
# | |
# Usage: udp_hole_punch_tester.py remote_host remote_port | |
# | |
# Run this script simultaneously on 2 hosts to test if they can punch | |
# a UDP hole to each other. | |
# | |
# * remote_port should be identical on 2 hosts. | |
# * if remote_port < 1024, must be root. | |
# * tested on python 2.5. | |
# | |
# Copyright (C) 2009 Dmitriy Samovskiy, http://somic.org | |
# | |
# License: Apache License, Version 2.0 | |
# http://www.apache.org/licenses/ | |
# | |
import sys, os, time, socket, random | |
from select import select | |
def log(*args): | |
print time.asctime(), ' '.join([str(x) for x in args]) | |
def puncher(remote_host, port): | |
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | |
sock.bind(('', port)) | |
my_token = str(random.random()) | |
log("my_token =", my_token) | |
remote_token = "_" | |
sock.setblocking(0) | |
sock.settimeout(5) | |
remote_knows_our_token = False | |
for i in range(60): | |
r,w,x = select([sock], [sock], [], 0) | |
if remote_token != "_" and remote_knows_our_token: | |
log("we are done - hole was punched from both ends") | |
break | |
if r: | |
data, addr = sock.recvfrom(1024) | |
log("recv:", data) | |
if remote_token == "_": | |
remote_token = data.split()[0] | |
log("remote_token is now", remote_token) | |
if len(data.split()) == 3: | |
log("remote end signals it knows our token") | |
remote_knows_our_token = True | |
if w: | |
data = "%s %s" % (my_token, remote_token) | |
if remote_token != "_": data += " ok" | |
log("sending:", data) | |
sock.sendto(data, (remote_host, port)) | |
log("sent", i) | |
time.sleep(0.5) | |
log("done") | |
sock.close() | |
return remote_token != "_" | |
if __name__ == '__main__': | |
remote_host = sys.argv[1] | |
port = int(sys.argv[2]) | |
if puncher(remote_host, port): | |
log("Punched UDP hole to %s:%d successfully" % (remote_host, port)) | |
else: | |
log("Failed to punch hole") |
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