73 lines
2.4 KiB
Python
Executable File
73 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3.6
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# -*- coding: utf-8 -*-
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"""
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TFC - Onion-routed, endpoint secure messaging system
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Copyright (C) 2013-2019 Markus Ottela
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This file is part of TFC.
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TFC is free software: you can redistribute it and/or modify it under the terms
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of the GNU General Public License as published by the Free Software Foundation,
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either version 3 of the License, or (at your option) any later version.
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TFC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with TFC. If not, see <https://www.gnu.org/licenses/>.
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"""
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import struct
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import time
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import typing
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from datetime import datetime
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from typing import Dict
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from src.common.encoding import bytes_to_int
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from src.common.exceptions import FunctionReturn
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from src.common.misc import ignored, separate_headers
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from src.common.output import m_print
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from src.common.statics import *
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if typing.TYPE_CHECKING:
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from multiprocessing import Queue
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from src.common.gateway import Gateway
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def receiver_loop(queues: Dict[bytes, 'Queue'],
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gateway: 'Gateway',
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unittest: bool = False
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) -> None:
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"""Decode received packets and forward them to packet queues."""
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gateway_queue = queues[GATEWAY_QUEUE]
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while True:
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with ignored(EOFError, KeyboardInterrupt):
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if gateway_queue.qsize() == 0:
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time.sleep(0.01)
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_, packet = gateway_queue.get()
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try:
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packet = gateway.detect_errors(packet)
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except FunctionReturn:
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continue
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header, ts_bytes, payload = separate_headers(packet, [DATAGRAM_HEADER_LENGTH, DATAGRAM_TIMESTAMP_LENGTH])
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try:
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ts = datetime.strptime(str(bytes_to_int(ts_bytes)), "%Y%m%d%H%M%S%f")
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except (ValueError, struct.error):
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m_print("Error: Failed to decode timestamp in the received packet.", head=1, tail=1)
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continue
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if header in [MESSAGE_DATAGRAM_HEADER, FILE_DATAGRAM_HEADER,
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COMMAND_DATAGRAM_HEADER, LOCAL_KEY_DATAGRAM_HEADER]:
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queues[header].put((ts, payload))
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if unittest:
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break
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