478 lines
19 KiB
Python
478 lines
19 KiB
Python
# MIT License
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#
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# Copyright (c) 2016-2022 Mark Qvist / unsigned.io
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from .Interface import Interface
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import socketserver
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import threading
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import platform
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import socket
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import time
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import sys
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import os
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import RNS
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class HDLC():
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FLAG = 0x7E
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ESC = 0x7D
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ESC_MASK = 0x20
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@staticmethod
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def escape(data):
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data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK]))
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data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK]))
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return data
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class KISS():
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FEND = 0xC0
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FESC = 0xDB
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TFEND = 0xDC
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TFESC = 0xDD
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CMD_DATA = 0x00
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CMD_UNKNOWN = 0xFE
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@staticmethod
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def escape(data):
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data = data.replace(bytes([0xdb]), bytes([0xdb, 0xdd]))
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data = data.replace(bytes([0xc0]), bytes([0xdb, 0xdc]))
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return data
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class ThreadingTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
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pass
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class TCPClientInterface(Interface):
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BITRATE_GUESS = 10*1000*1000
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RECONNECT_WAIT = 5
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RECONNECT_MAX_TRIES = None
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# TCP socket options
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TCP_USER_TIMEOUT = 20
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TCP_PROBE_AFTER = 5
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TCP_PROBE_INTERVAL = 3
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TCP_PROBES = 5
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I2P_USER_TIMEOUT = 40
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I2P_PROBE_AFTER = 10
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I2P_PROBE_INTERVAL = 5
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I2P_PROBES = 6
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def __init__(self, owner, name, target_ip=None, target_port=None, connected_socket=None, max_reconnect_tries=None, kiss_framing=False, i2p_tunneled = False):
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self.rxb = 0
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self.txb = 0
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self.IN = True
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self.OUT = False
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self.socket = None
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self.parent_interface = None
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self.name = name
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self.initiator = False
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self.reconnecting = False
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self.never_connected = True
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self.owner = owner
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self.writing = False
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self.online = False
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self.detached = False
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self.kiss_framing = kiss_framing
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self.i2p_tunneled = i2p_tunneled
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self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
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self.bitrate = TCPClientInterface.BITRATE_GUESS
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if max_reconnect_tries == None:
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self.max_reconnect_tries = TCPClientInterface.RECONNECT_MAX_TRIES
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else:
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self.max_reconnect_tries = max_reconnect_tries
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if connected_socket != None:
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self.receives = True
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self.target_ip = None
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self.target_port = None
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self.socket = connected_socket
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if platform.system() == "Linux":
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self.set_timeouts_linux()
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elif platform.system() == "Darwin":
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self.set_timeouts_osx()
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elif target_ip != None and target_port != None:
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self.receives = True
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self.target_ip = target_ip
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self.target_port = target_port
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self.initiator = True
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if not self.connect(initial=True):
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thread = threading.Thread(target=self.reconnect)
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thread.setDaemon(True)
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thread.start()
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else:
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thread = threading.Thread(target=self.read_loop)
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thread.setDaemon(True)
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thread.start()
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if not self.kiss_framing:
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self.wants_tunnel = True
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def set_timeouts_linux(self):
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if not self.i2p_tunneled:
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_USER_TIMEOUT, int(TCPClientInterface.TCP_USER_TIMEOUT * 1000))
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self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(TCPClientInterface.TCP_PROBE_INTERVAL))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(TCPClientInterface.TCP_PROBES))
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else:
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_USER_TIMEOUT, int(TCPClientInterface.I2P_USER_TIMEOUT * 1000))
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self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, int(TCPClientInterface.I2P_PROBE_AFTER))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(TCPClientInterface.I2P_PROBE_INTERVAL))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(TCPClientInterface.I2P_PROBES))
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def set_timeouts_osx(self):
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if hasattr(socket, "TCP_KEEPALIVE"):
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TCP_KEEPIDLE = socket.TCP_KEEPALIVE
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else:
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TCP_KEEPIDLE = 0x10
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self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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if not self.i2p_tunneled:
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self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
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else:
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self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(TCPClientInterface.I2P_PROBE_AFTER))
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def detach(self):
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if self.socket != None:
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if hasattr(self.socket, "close"):
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if callable(self.socket.close):
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RNS.log("Detaching "+str(self), RNS.LOG_DEBUG)
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self.detached = True
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try:
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self.socket.shutdown(socket.SHUT_RDWR)
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except Exception as e:
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RNS.log("Error while shutting down socket for "+str(self)+": "+str(e))
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try:
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self.socket.close()
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except Exception as e:
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RNS.log("Error while closing socket for "+str(self)+": "+str(e))
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self.socket = None
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def connect(self, initial=False):
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try:
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self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.socket.connect((self.target_ip, self.target_port))
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self.online = True
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except Exception as e:
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if initial:
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RNS.log("Initial connection for "+str(self)+" could not be established: "+str(e), RNS.LOG_ERROR)
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RNS.log("Leaving unconnected and retrying connection in "+str(TCPClientInterface.RECONNECT_WAIT)+" seconds.", RNS.LOG_ERROR)
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return False
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else:
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raise e
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if platform.system() == "Linux":
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self.set_timeouts_linux()
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elif platform.system() == "Darwin":
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self.set_timeouts_osx()
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self.online = True
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self.writing = False
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self.never_connected = False
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return True
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def reconnect(self):
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if self.initiator:
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if not self.reconnecting:
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self.reconnecting = True
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attempts = 0
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while not self.online:
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time.sleep(TCPClientInterface.RECONNECT_WAIT)
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attempts += 1
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if self.max_reconnect_tries != None and attempts > self.max_reconnect_tries:
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RNS.log("Max reconnection attempts reached for "+str(self), RNS.LOG_ERROR)
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self.teardown()
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break
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try:
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self.connect()
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except Exception as e:
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RNS.log("Connection attempt for "+str(self)+" failed: "+str(e), RNS.LOG_DEBUG)
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if not self.never_connected:
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RNS.log("Reconnected TCP socket for "+str(self)+".", RNS.LOG_INFO)
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self.reconnecting = False
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thread = threading.Thread(target=self.read_loop)
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thread.setDaemon(True)
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thread.start()
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if not self.kiss_framing:
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RNS.Transport.synthesize_tunnel(self)
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else:
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RNS.log("Attempt to reconnect on a non-initiator TCP interface. This should not happen.", RNS.LOG_ERROR)
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raise IOError("Attempt to reconnect on a non-initiator TCP interface")
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def processIncoming(self, data):
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self.rxb += len(data)
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if hasattr(self, "parent_interface") and self.parent_interface != None:
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self.parent_interface.rxb += len(data)
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self.owner.inbound(data, self)
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def processOutgoing(self, data):
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if self.online:
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while self.writing:
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time.sleep(0.01)
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try:
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self.writing = True
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if self.kiss_framing:
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data = bytes([KISS.FEND])+bytes([KISS.CMD_DATA])+KISS.escape(data)+bytes([KISS.FEND])
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else:
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data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG])
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self.socket.sendall(data)
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self.writing = False
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self.txb += len(data)
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if hasattr(self, "parent_interface") and self.parent_interface != None:
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self.parent_interface.txb += len(data)
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except Exception as e:
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RNS.log("Exception occurred while transmitting via "+str(self)+", tearing down interface", RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
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self.teardown()
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def read_loop(self):
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try:
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in_frame = False
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escape = False
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data_buffer = b""
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command = KISS.CMD_UNKNOWN
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while True:
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data_in = self.socket.recv(4096)
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if len(data_in) > 0:
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pointer = 0
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while pointer < len(data_in):
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byte = data_in[pointer]
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pointer += 1
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if self.kiss_framing:
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# Read loop for KISS framing
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if (in_frame and byte == KISS.FEND and command == KISS.CMD_DATA):
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in_frame = False
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self.processIncoming(data_buffer)
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elif (byte == KISS.FEND):
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in_frame = True
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command = KISS.CMD_UNKNOWN
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data_buffer = b""
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elif (in_frame and len(data_buffer) < RNS.Reticulum.MTU):
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if (len(data_buffer) == 0 and command == KISS.CMD_UNKNOWN):
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# We only support one HDLC port for now, so
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# strip off the port nibble
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byte = byte & 0x0F
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command = byte
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elif (command == KISS.CMD_DATA):
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if (byte == KISS.FESC):
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escape = True
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else:
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if (escape):
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if (byte == KISS.TFEND):
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byte = KISS.FEND
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if (byte == KISS.TFESC):
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byte = KISS.FESC
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escape = False
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data_buffer = data_buffer+bytes([byte])
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else:
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# Read loop for HDLC framing
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if (in_frame and byte == HDLC.FLAG):
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in_frame = False
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self.processIncoming(data_buffer)
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elif (byte == HDLC.FLAG):
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in_frame = True
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data_buffer = b""
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elif (in_frame and len(data_buffer) < RNS.Reticulum.MTU):
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if (byte == HDLC.ESC):
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escape = True
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else:
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if (escape):
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if (byte == HDLC.FLAG ^ HDLC.ESC_MASK):
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byte = HDLC.FLAG
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if (byte == HDLC.ESC ^ HDLC.ESC_MASK):
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byte = HDLC.ESC
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escape = False
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data_buffer = data_buffer+bytes([byte])
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else:
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self.online = False
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if self.initiator and not self.detached:
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RNS.log("TCP socket for "+str(self)+" was closed, attempting to reconnect...", RNS.LOG_WARNING)
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self.reconnect()
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else:
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RNS.log("TCP socket for remote client "+str(self)+" was closed.", RNS.LOG_VERBOSE)
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self.teardown()
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break
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except Exception as e:
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self.online = False
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RNS.log("An interface error occurred for "+str(self)+", the contained exception was: "+str(e), RNS.LOG_WARNING)
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if self.initiator:
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RNS.log("Attempting to reconnect...", RNS.LOG_WARNING)
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self.reconnect()
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else:
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self.teardown()
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def teardown(self):
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if self.initiator and not self.detached:
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RNS.log("The interface "+str(self)+" experienced an unrecoverable error and is being torn down. Restart Reticulum to attempt to open this interface again.", RNS.LOG_ERROR)
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if RNS.Reticulum.panic_on_interface_error:
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RNS.panic()
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else:
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RNS.log("The interface "+str(self)+" is being torn down.", RNS.LOG_VERBOSE)
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self.online = False
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self.OUT = False
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self.IN = False
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if hasattr(self, "parent_interface") and self.parent_interface != None:
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self.parent_interface.clients -= 1
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if self in RNS.Transport.interfaces:
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if not self.initiator:
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RNS.Transport.interfaces.remove(self)
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def __str__(self):
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return "TCPInterface["+str(self.name)+"/"+str(self.target_ip)+":"+str(self.target_port)+"]"
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class TCPServerInterface(Interface):
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BITRATE_GUESS = 10*1000*1000
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@staticmethod
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def get_address_for_if(name):
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import importlib
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if importlib.util.find_spec('netifaces') != None:
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import netifaces
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return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['addr']
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else:
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RNS.log("Getting interface addresses from device names requires the netifaces module.", RNS.LOG_CRITICAL)
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RNS.log("You can install it with the command: python3 -m pip install netifaces", RNS.LOG_CRITICAL)
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RNS.panic()
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@staticmethod
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def get_broadcast_for_if(name):
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import importlib
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if importlib.util.find_spec('netifaces') != None:
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import netifaces
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return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['broadcast']
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else:
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RNS.log("Getting interface addresses from device names requires the netifaces module.", RNS.LOG_CRITICAL)
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RNS.log("You can install it with the command: python3 -m pip install netifaces", RNS.LOG_CRITICAL)
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RNS.panic()
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def __init__(self, owner, name, device=None, bindip=None, bindport=None, i2p_tunneled=False):
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self.rxb = 0
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self.txb = 0
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self.online = False
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self.clients = 0
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self.IN = True
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self.OUT = False
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self.name = name
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self.i2p_tunneled = i2p_tunneled
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self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
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if device != None:
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bindip = TCPServerInterface.get_address_for_if(device)
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if (bindip != None and bindport != None):
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self.receives = True
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self.bind_ip = bindip
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self.bind_port = bindport
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def handlerFactory(callback):
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def createHandler(*args, **keys):
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return TCPInterfaceHandler(callback, *args, **keys)
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return createHandler
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self.owner = owner
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address = (self.bind_ip, self.bind_port)
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ThreadingTCPServer.allow_reuse_address = True
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self.server = ThreadingTCPServer(address, handlerFactory(self.incoming_connection))
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self.bitrate = TCPServerInterface.BITRATE_GUESS
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thread = threading.Thread(target=self.server.serve_forever)
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thread.setDaemon(True)
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thread.start()
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self.online = True
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def incoming_connection(self, handler):
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RNS.log("Accepting incoming TCP connection", RNS.LOG_VERBOSE)
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interface_name = "Client on "+self.name
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spawned_interface = TCPClientInterface(self.owner, interface_name, target_ip=None, target_port=None, connected_socket=handler.request, i2p_tunneled=self.i2p_tunneled)
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spawned_interface.OUT = self.OUT
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spawned_interface.IN = self.IN
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spawned_interface.target_ip = handler.client_address[0]
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spawned_interface.target_port = str(handler.client_address[1])
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spawned_interface.parent_interface = self
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spawned_interface.bitrate = self.bitrate
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spawned_interface.ifac_size = self.ifac_size
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spawned_interface.ifac_netname = self.ifac_netname
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spawned_interface.ifac_netkey = self.ifac_netkey
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spawned_interface.online = True
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RNS.log("Spawned new TCPClient Interface: "+str(spawned_interface), RNS.LOG_VERBOSE)
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RNS.Transport.interfaces.append(spawned_interface)
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self.clients += 1
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spawned_interface.read_loop()
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def processOutgoing(self, data):
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pass
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def __str__(self):
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return "TCPServerInterface["+self.name+"/"+self.bind_ip+":"+str(self.bind_port)+"]"
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class TCPInterfaceHandler(socketserver.BaseRequestHandler):
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def __init__(self, callback, *args, **keys):
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self.callback = callback
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socketserver.BaseRequestHandler.__init__(self, *args, **keys)
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def handle(self):
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self.callback(handler=self)
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