295 lines
10 KiB
Python
295 lines
10 KiB
Python
from .Interface import Interface
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import socketserver
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import threading
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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 LocalClientInterface(Interface):
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RECONNECT_WAIT = 3
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def __init__(self, owner, name, target_port = None, connected_socket=None):
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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.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.reconnecting = False
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self.never_connected = True
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self.detached = False
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self.name = name
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self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
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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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self.is_connected_to_shared_instance = False
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elif target_port != None:
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self.receives = True
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self.target_ip = "127.0.0.1"
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self.target_port = target_port
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self.connect()
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self.owner = owner
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self.online = True
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self.writing = False
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if connected_socket == None:
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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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def connect(self):
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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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self.is_connected_to_shared_instance = True
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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.is_connected_to_shared_instance:
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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(LocalClientInterface.RECONNECT_WAIT)
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attempts += 1
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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.shared_connection_reappeared()
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else:
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RNS.log("Attempt to reconnect on a non-initiator shared local interface. This should not happen.", RNS.LOG_ERROR)
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raise IOError("Attempt to reconnect on a non-initiator local 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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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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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.is_connected_to_shared_instance and not self.detached:
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RNS.log("Socket for "+str(self)+" was closed, attempting to reconnect...", RNS.LOG_WARNING)
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RNS.Transport.shared_connection_disappeared()
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self.reconnect()
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else:
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self.teardown(nowarning=True)
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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, the contained exception was: "+str(e), RNS.LOG_ERROR)
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RNS.log("Tearing down "+str(self), RNS.LOG_ERROR)
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self.teardown()
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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 teardown(self, nowarning=False):
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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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if self in RNS.Transport.local_client_interfaces:
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RNS.Transport.local_client_interfaces.remove(self)
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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 nowarning == False:
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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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if self.is_connected_to_shared_instance:
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if nowarning == False:
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RNS.log("Permanently lost connection to local shared RNS instance. Exiting now.", RNS.LOG_CRITICAL)
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RNS.exit()
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def __str__(self):
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return "LocalInterface["+str(self.target_port)+"]"
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class LocalServerInterface(Interface):
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def __init__(self, owner, bindport=None):
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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 = "Reticulum"
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self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
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if (bindport != None):
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self.receives = True
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self.bind_ip = "127.0.0.1"
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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 LocalInterfaceHandler(callback, *args, **keys)
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return createHandler
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self.owner = owner
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self.is_local_shared_instance = True
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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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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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interface_name = str(str(handler.client_address[1]))
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spawned_interface = LocalClientInterface(self.owner, name=interface_name, 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("Accepting new connection to shared instance: "+str(spawned_interface), RNS.LOG_VERBOSE)
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RNS.Transport.interfaces.append(spawned_interface)
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RNS.Transport.local_client_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 "Shared Instance["+str(self.bind_port)+"]"
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class LocalInterfaceHandler(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) |