204 lines
7.7 KiB
Python
204 lines
7.7 KiB
Python
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import logging
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import asyncio
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import argparse
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from . import sam
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from . import aiosam
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from . import utils
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from .log import logger
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BUFFER_SIZE = 65536
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async def proxy_data(reader, writer):
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"""Proxy data from reader to writer"""
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try:
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while True:
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data = await reader.read(BUFFER_SIZE)
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if not data:
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break
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writer.write(data)
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except Exception as e:
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logger.debug('proxy_data_task exception {}'.format(e))
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finally:
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try:
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writer.close()
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except RuntimeError:
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pass
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logger.debug('close connection')
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class I2PTunnel(object):
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"""Base I2P Tunnel object, not to be used directly
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:param local_address: A local address to use for a tunnel.
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E.g. ("127.0.0.1", 6668)
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:param destination: (optional) Destination to use for this tunnel. Can be
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a base64 encoded string, :class:`Destination`
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instance or None. A new destination is created when it
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is None.
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:param session_name: (optional) Session nick name. A new session nickname is
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generated if not specified.
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:param options: (optional) A dict object with i2cp options
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:param loop: (optional) Event loop instance
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:param sam_address: (optional) SAM API address
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"""
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def __init__(self, local_address, destination=None, session_name=None,
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options={}, loop=None, sam_address=sam.DEFAULT_ADDRESS):
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self.local_address = local_address
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self.destination = destination
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self.session_name = session_name or utils.generate_session_id()
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self.options = options
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self.loop = loop
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self.sam_address = sam_address
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async def _pre_run(self):
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if not self.destination:
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self.destination = await aiosam.new_destination(
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sam_address=self.sam_address, loop=self.loop)
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_, self.session_writer = await aiosam.create_session(
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self.session_name, style=self.style, options=self.options,
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sam_address=self.sam_address,
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loop=self.loop, destination=self.destination)
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def stop(self):
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"""Stop the tunnel"""
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self.session_writer.close()
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class ClientTunnel(I2PTunnel):
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"""Client tunnel, a subclass of tunnel.I2PTunnel
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If you run a client tunnel with a local address ("127.0.0.1", 6668) and
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a remote destination "irc.echelon.i2p", all connections to 127.0.0.1:6668
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will be proxied to irc.echelon.i2p.
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:param remote_destination: Remote I2P destination, can be either .i2p
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domain, .b32.i2p address, base64 destination or
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:class:`Destination` instance
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"""
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def __init__(self, remote_destination, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.style = "STREAM"
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self.remote_destination = remote_destination
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async def run(self):
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"""A coroutine used to run the tunnel"""
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await self._pre_run()
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async def handle_client(client_reader, client_writer):
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"""Handle local client connection"""
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remote_reader, remote_writer = await aiosam.stream_connect(
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self.session_name, self.remote_destination,
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sam_address=self.sam_address, loop=self.loop)
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asyncio.ensure_future(proxy_data(remote_reader, client_writer),
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loop=self.loop)
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asyncio.ensure_future(proxy_data(client_reader, remote_writer),
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loop=self.loop)
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self.server = await asyncio.start_server(handle_client, *self.local_address,
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loop=self.loop)
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def stop(self):
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super().stop()
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self.server.close()
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class ServerTunnel(I2PTunnel):
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"""Server tunnel, a subclass of tunnel.I2PTunnel
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If you want to expose a local service 127.0.0.1:80 to the I2P network, run
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a server tunnel with a local address ("127.0.0.1", 80). If you don't
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provide a private key or a session name, it will use a TRANSIENT
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destination.
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.style = "STREAM"
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async def run(self):
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"""A coroutine used to run the tunnel"""
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await self._pre_run()
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async def handle_client(incoming, client_reader, client_writer):
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# data and dest may come in one chunk
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dest, data = incoming.split(b"\n", 1)
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remote_destination = sam.Destination(dest.decode())
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logger.debug("{} client connected: {}.b32.i2p".format(
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self.session_name, remote_destination.base32))
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try:
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remote_reader, remote_writer = await asyncio.wait_for(
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asyncio.open_connection(
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host=self.local_address[0],
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port=self.local_address[1], loop=self.loop),
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timeout=5, loop=self.loop)
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if data: remote_writer.write(data)
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asyncio.ensure_future(proxy_data(remote_reader, client_writer),
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loop=self.loop)
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asyncio.ensure_future(proxy_data(client_reader, remote_writer),
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loop=self.loop)
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except ConnectionRefusedError:
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client_writer.close()
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async def server_loop():
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try:
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while True:
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client_reader, client_writer = await aiosam.stream_accept(
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self.session_name, sam_address=self.sam_address,
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loop=self.loop)
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incoming = await client_reader.read(BUFFER_SIZE)
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asyncio.ensure_future(handle_client(
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incoming, client_reader, client_writer), loop=self.loop)
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except asyncio.CancelledError:
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pass
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self.server_loop = asyncio.ensure_future(server_loop(), loop=self.loop)
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def stop(self):
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super().stop()
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self.server_loop.cancel()
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('type', metavar="TYPE", choices=('server', 'client'),
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help="Tunnel type (server or client)")
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parser.add_argument('address', metavar="ADDRESS",
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help="Local address (e.g. 127.0.0.1:8000)")
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parser.add_argument('--debug', '-d', action='store_true',
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help='Debugging')
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parser.add_argument('--key', '-k', default='', metavar='PRIVATE_KEY',
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help='Path to private key file')
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parser.add_argument('--destination', '-D', default='',
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metavar='DESTINATION', help='Remote destination')
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args = parser.parse_args()
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SAM_ADDRESS = utils.get_sam_address()
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logging.basicConfig(level=logging.DEBUG if args.debug else logging.INFO)
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loop = asyncio.get_event_loop()
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loop.set_debug(args.debug)
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if args.key:
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destination = sam.Destination(path=args.key, has_private_key=True)
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else:
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destination = None
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local_address = utils.address_from_string(args.address)
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if args.type == "client":
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tunnel = ClientTunnel(args.destination, local_address, loop=loop,
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destination=destination, sam_address=SAM_ADDRESS)
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elif args.type == "server":
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tunnel = ServerTunnel(local_address, loop=loop, destination=destination,
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sam_address=SAM_ADDRESS)
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asyncio.ensure_future(tunnel.run(), loop=loop)
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try:
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loop.run_forever()
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except KeyboardInterrupt:
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tunnel.stop()
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finally:
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loop.stop()
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loop.close()
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