forked from auracaster/bumble_mirror
107 lines
3.7 KiB
Python
107 lines
3.7 KiB
Python
# Copyright 2021-2022 Google LLC
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# https://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Imports
|
|
# -----------------------------------------------------------------------------
|
|
from __future__ import annotations
|
|
|
|
import asyncio
|
|
import logging
|
|
import socket
|
|
|
|
from bumble.transport.common import StreamPacketSource, Transport
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Logging
|
|
# -----------------------------------------------------------------------------
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
# -----------------------------------------------------------------------------
|
|
async def open_tcp_server_transport(spec: str) -> Transport:
|
|
'''
|
|
Open a TCP server transport.
|
|
The parameter string has this syntax:
|
|
<local-host>:<local-port>
|
|
Where <local-host> may be the address of a local network interface, or '_'
|
|
to accept connections on all local network interfaces.
|
|
|
|
Example: _:9001
|
|
'''
|
|
local_host, local_port = spec.rsplit(':', maxsplit=1)
|
|
return await _open_tcp_server_transport_impl(
|
|
host=local_host if local_host != '_' else None, port=int(local_port)
|
|
)
|
|
|
|
|
|
async def open_tcp_server_transport_with_socket(
|
|
sock: socket.socket,
|
|
) -> Transport:
|
|
'''
|
|
Open a TCP server transport with an existing socket.
|
|
|
|
One reason to use this variant is to let python pick an unused port.
|
|
'''
|
|
return await _open_tcp_server_transport_impl(sock=sock)
|
|
|
|
|
|
async def _open_tcp_server_transport_impl(**kwargs) -> Transport:
|
|
class TcpServerTransport(Transport):
|
|
def __init__(self, source, sink, server):
|
|
self.server = server
|
|
super().__init__(source, sink)
|
|
|
|
class TcpServerProtocol(asyncio.BaseProtocol):
|
|
def __init__(self, packet_source, packet_sink):
|
|
self.packet_source = packet_source
|
|
self.packet_sink = packet_sink
|
|
|
|
# Called when a new connection is established
|
|
def connection_made(self, transport):
|
|
peer_name = transport.get_extra_info('peer_name')
|
|
logger.debug(f'connection from {peer_name}')
|
|
self.packet_sink.transport = transport
|
|
|
|
# Called when the client is disconnected
|
|
def connection_lost(self, error):
|
|
logger.debug(f'connection lost: {error}')
|
|
self.packet_sink.transport = None
|
|
|
|
def eof_received(self):
|
|
logger.debug('connection end')
|
|
self.packet_sink.transport = None
|
|
|
|
# Called when data is received on the socket
|
|
def data_received(self, data):
|
|
self.packet_source.data_received(data)
|
|
|
|
class TcpServerPacketSink:
|
|
def __init__(self):
|
|
self.transport = None
|
|
|
|
def on_packet(self, packet):
|
|
if self.transport:
|
|
self.transport.write(packet)
|
|
else:
|
|
logger.debug('no client, dropping packet')
|
|
|
|
packet_source = StreamPacketSource()
|
|
packet_sink = TcpServerPacketSink()
|
|
server = await asyncio.get_running_loop().create_server(
|
|
lambda: TcpServerProtocol(packet_source, packet_sink), **kwargs
|
|
)
|
|
|
|
return TcpServerTransport(packet_source, packet_sink, server)
|