311 lines
11 KiB
Python
311 lines
11 KiB
Python
from .Interface import Interface
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import socketserver
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import threading
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import netifaces
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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 ThreadingTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
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pass
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class TCPClientInterface(Interface):
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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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def __init__(self, owner, name, target_ip=None, target_port=None, connected_socket=None, max_reconnect_tries=None):
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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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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(False)
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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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self.wants_tunnel = True
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def set_timeouts_linux(self):
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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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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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sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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sock.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
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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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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.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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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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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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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 (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:
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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:
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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 self in RNS.Transport.interfaces:
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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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@staticmethod
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def get_address_for_if(name):
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return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['addr']
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def get_broadcast_for_if(name):
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return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['broadcast']
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def __init__(self, owner, name, device=None, bindip=None, bindport=None):
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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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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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self.server = ThreadingTCPServer(address, handlerFactory(self.incoming_connection))
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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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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)
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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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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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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) |