[133] | 1 | #!/usr/bin/env python |
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| 2 | # -*- coding: utf-8 -*- |
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| 3 | # |
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| 4 | # EtherWebSocket tunneling Server/Client |
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| 5 | # |
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| 6 | # depends on: |
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| 7 | # - python-2.7.2 |
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| 8 | # - python-pytun-0.2 |
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| 9 | # - websocket-client-0.4.1 |
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| 10 | # - tornado-1.2.1 |
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| 11 | # |
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| 12 | # todo: |
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| 13 | # - direct binary transmission support (to improve performance) |
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| 14 | # |
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| 15 | # =========================================================================== |
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| 16 | # Copyright (c) 2012, Atzm WATANABE <atzm@atzm.org> |
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| 17 | # All rights reserved. |
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| 18 | # |
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| 19 | # Redistribution and use in source and binary forms, with or without |
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| 20 | # modification, are permitted provided that the following conditions are met: |
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| 21 | # |
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| 22 | # 1. Redistributions of source code must retain the above copyright notice, |
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| 23 | # this list of conditions and the following disclaimer. |
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| 24 | # 2. Redistributions in binary form must reproduce the above copyright |
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| 25 | # notice, this list of conditions and the following disclaimer in the |
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| 26 | # documentation and/or other materials provided with the distribution. |
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| 27 | # |
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| 28 | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 29 | # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 30 | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 31 | # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 32 | # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 33 | # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 34 | # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 35 | # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 36 | # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 37 | # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 38 | # POSSIBILITY OF SUCH DAMAGE. |
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| 39 | # =========================================================================== |
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| 40 | # |
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| 41 | # $Id$ |
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| 42 | |
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| 43 | import os |
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| 44 | import sys |
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| 45 | import base64 |
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| 46 | import select |
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| 47 | import argparse |
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| 48 | import threading |
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| 49 | |
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| 50 | import pytun |
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| 51 | import websocket |
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| 52 | import tornado.httpserver |
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| 53 | import tornado.ioloop |
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| 54 | import tornado.web |
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| 55 | import tornado.websocket |
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| 56 | |
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| 57 | |
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| 58 | class TapListener(threading.Thread): |
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| 59 | daemon = True |
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| 60 | |
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| 61 | def __init__(self, dev, debug=False): |
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| 62 | super(TapListener, self).__init__() |
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| 63 | |
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| 64 | self._debug = debug |
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| 65 | self._tap = pytun.TunTapDevice(dev, pytun.IFF_TAP | pytun.IFF_NO_PI) |
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| 66 | self._tap.up() |
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| 67 | |
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| 68 | self._clients = [] |
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| 69 | self._clients_lock = threading.Lock() |
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| 70 | |
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| 71 | def register_client(self, client): |
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| 72 | try: |
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| 73 | self._clients_lock.acquire() |
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| 74 | self._clients.append(client) |
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| 75 | finally: |
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| 76 | self._clients_lock.release() |
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| 77 | |
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| 78 | def unregister_client(self, client): |
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| 79 | try: |
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| 80 | self._clients_lock.acquire() |
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| 81 | self._clients.remove(client) |
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| 82 | except ValueError: |
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| 83 | pass |
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| 84 | finally: |
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| 85 | self._clients_lock.release() |
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| 86 | |
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| 87 | def write(self, caller, message): |
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| 88 | if self._debug: |
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| 89 | sys.stderr.write('%s: %s\n' % (caller.__class__.__name__, |
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| 90 | message.encode('hex'))) |
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| 91 | |
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| 92 | try: |
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| 93 | self._clients_lock.acquire() |
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| 94 | clients = self._clients[:] |
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| 95 | finally: |
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| 96 | self._clients_lock.release() |
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| 97 | |
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| 98 | if caller is not self: |
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| 99 | clients.remove(caller) |
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| 100 | self._tap.write(message) |
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| 101 | |
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| 102 | message = base64.b64encode(message) |
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| 103 | |
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| 104 | for c in clients: |
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| 105 | c.write_message(message) |
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| 106 | |
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| 107 | def run(self): |
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| 108 | epoll = select.epoll() |
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| 109 | epoll.register(self._tap.fileno(), select.EPOLLIN) |
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| 110 | |
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| 111 | while True: |
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| 112 | evts = epoll.poll(1) |
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| 113 | for fileno, evt in evts: |
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| 114 | self.write(self, self._tap.read(self._tap.mtu)) |
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| 115 | |
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| 116 | |
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| 117 | class EtherWebSocket(tornado.websocket.WebSocketHandler): |
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| 118 | def __init__(self, app, req, tap, debug=False): |
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| 119 | super(EtherWebSocket, self).__init__(app, req) |
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| 120 | self._tap = tap |
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| 121 | self._debug = debug |
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| 122 | |
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| 123 | def open(self): |
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| 124 | if self._debug: |
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| 125 | sys.stderr.write('[%s] opened\n' % self.request.remote_ip) |
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| 126 | self._tap.register_client(self) |
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| 127 | |
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| 128 | def on_message(self, message): |
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| 129 | if self._debug: |
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| 130 | sys.stderr.write('[%s] received\n' % self.request.remote_ip) |
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| 131 | self._tap.write(self, base64.b64decode(message)) |
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| 132 | |
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| 133 | def on_close(self): |
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| 134 | if self._debug: |
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| 135 | sys.stderr.write('[%s] closed\n' % self.request.remote_ip) |
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| 136 | self._tap.unregister_client(self) |
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| 137 | |
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| 138 | |
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[134] | 139 | def daemonize(nochdir=False, noclose=False): |
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| 140 | if os.fork() > 0: |
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| 141 | sys.exit(0) |
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| 142 | |
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| 143 | os.setsid() |
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| 144 | |
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| 145 | if os.fork() > 0: |
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| 146 | sys.exit(0) |
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| 147 | |
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| 148 | if not nochdir: |
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| 149 | os.chdir('/') |
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| 150 | |
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| 151 | if not noclose: |
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| 152 | os.umask(0) |
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| 153 | sys.stdin.close() |
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| 154 | sys.stdout.close() |
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| 155 | sys.stderr.close() |
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| 156 | os.close(0) |
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| 157 | os.close(1) |
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| 158 | os.close(2) |
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| 159 | sys.stdin = open(os.devnull) |
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| 160 | sys.stdout = open(os.devnull, 'a') |
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| 161 | sys.stderr = open(os.devnull, 'a') |
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| 162 | |
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| 163 | |
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[133] | 164 | def server_main(args): |
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| 165 | tap = TapListener(args.device, debug=args.debug) |
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| 166 | tap.start() |
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| 167 | |
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| 168 | app = tornado.web.Application([ |
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| 169 | (args.path, EtherWebSocket, {'tap': tap, 'debug': args.debug}), |
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| 170 | ]) |
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| 171 | server = tornado.httpserver.HTTPServer(app) |
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| 172 | server.listen(args.port, address=args.address) |
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| 173 | |
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| 174 | tornado.ioloop.IOLoop.instance().start() |
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| 175 | |
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| 176 | |
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| 177 | def client_main(args): |
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| 178 | if args.debug: |
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| 179 | websocket.enableTrace(True) |
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| 180 | |
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| 181 | tap = TapListener(args.device, debug=args.debug) |
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| 182 | client = websocket.WebSocketApp(args.uri) |
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| 183 | client.write_message = client.send |
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| 184 | client.on_message = lambda s, m: tap.write(client, base64.b64decode(m)) |
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| 185 | |
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| 186 | if args.debug: |
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| 187 | client.on_error = lambda s, e: sys.stderr.write(str(e) + '\n') |
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| 188 | client.on_close = lambda s: sys.stderr.write('closed\n') |
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| 189 | |
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| 190 | tap.register_client(client) |
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| 191 | tap.start() |
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| 192 | |
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| 193 | client.run_forever() |
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| 194 | |
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| 195 | |
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| 196 | def main(): |
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| 197 | parser = argparse.ArgumentParser() |
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| 198 | parser.add_argument('--device', action='store', default='ethws%d') |
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| 199 | parser.add_argument('--foreground', action='store_true', default=False) |
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| 200 | parser.add_argument('--debug', action='store_true', default=False) |
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| 201 | |
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| 202 | subparsers = parser.add_subparsers(dest='subcommand') |
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| 203 | |
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| 204 | parser_server = subparsers.add_parser('server') |
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| 205 | parser_server.add_argument('--address', action='store', default='') |
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| 206 | parser_server.add_argument('--port', action='store', type=int, default=80) |
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| 207 | parser_server.add_argument('--path', action='store', default='/') |
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| 208 | |
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| 209 | parser_client = subparsers.add_parser('client') |
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| 210 | parser_client.add_argument('--uri', action='store', required=True) |
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| 211 | |
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| 212 | args = parser.parse_args() |
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| 213 | |
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[134] | 214 | if not args.foreground: |
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| 215 | daemonize() |
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| 216 | |
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[133] | 217 | if args.subcommand == 'server': |
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| 218 | server_main(args) |
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| 219 | elif args.subcommand == 'client': |
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| 220 | client_main(args) |
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| 221 | |
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| 222 | |
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| 223 | if __name__ == '__main__': |
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| 224 | main() |
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