356 lines
13 KiB
Python
356 lines
13 KiB
Python
from .Interface import Interface
|
|
import socketserver
|
|
import threading
|
|
import netifaces
|
|
import platform
|
|
import socket
|
|
import time
|
|
import sys
|
|
import os
|
|
import RNS
|
|
|
|
class HDLC():
|
|
FLAG = 0x7E
|
|
ESC = 0x7D
|
|
ESC_MASK = 0x20
|
|
|
|
@staticmethod
|
|
def escape(data):
|
|
data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK]))
|
|
data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK]))
|
|
return data
|
|
|
|
class ThreadingTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
|
|
pass
|
|
|
|
class TCPClientInterface(Interface):
|
|
RECONNECT_WAIT = 5
|
|
RECONNECT_MAX_TRIES = None
|
|
|
|
# TCP socket options
|
|
TCP_USER_TIMEOUT = 20
|
|
TCP_PROBE_AFTER = 5
|
|
TCP_PROBE_INTERVAL = 3
|
|
TCP_PROBES = 5
|
|
|
|
def __init__(self, owner, name, target_ip=None, target_port=None, connected_socket=None, max_reconnect_tries=None):
|
|
self.rxb = 0
|
|
self.txb = 0
|
|
|
|
self.IN = True
|
|
self.OUT = False
|
|
self.socket = None
|
|
self.parent_interface = None
|
|
self.name = name
|
|
self.initiator = False
|
|
self.reconnecting = False
|
|
self.never_connected = True
|
|
self.owner = owner
|
|
self.writing = False
|
|
self.online = False
|
|
self.detached = False
|
|
|
|
if max_reconnect_tries == None:
|
|
self.max_reconnect_tries = TCPClientInterface.RECONNECT_MAX_TRIES
|
|
else:
|
|
self.max_reconnect_tries = max_reconnect_tries
|
|
|
|
if connected_socket != None:
|
|
self.receives = True
|
|
self.target_ip = None
|
|
self.target_port = None
|
|
self.socket = connected_socket
|
|
|
|
if platform.system() == "Linux":
|
|
self.set_timeouts_linux()
|
|
elif platform.system() == "Darwin":
|
|
self.set_timeouts_osx()
|
|
|
|
elif target_ip != None and target_port != None:
|
|
self.receives = True
|
|
self.target_ip = target_ip
|
|
self.target_port = target_port
|
|
self.initiator = True
|
|
|
|
if not self.connect(initial=True):
|
|
thread = threading.Thread(target=self.reconnect)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
else:
|
|
thread = threading.Thread(target=self.read_loop)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
self.wants_tunnel = True
|
|
|
|
|
|
def set_timeouts_linux(self):
|
|
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_USER_TIMEOUT, int(TCPClientInterface.TCP_USER_TIMEOUT * 1000))
|
|
|
|
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
|
|
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
|
|
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(TCPClientInterface.TCP_PROBE_INTERVAL))
|
|
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(TCPClientInterface.TCP_PROBES))
|
|
|
|
def set_timeouts_osx(self):
|
|
if hasattr(socket, "TCP_KEEPALIVE"):
|
|
TCP_KEEPIDLE = socket.TCP_KEEPALIVE
|
|
else:
|
|
TCP_KEEPIDLE = 0x10
|
|
|
|
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
|
|
sock.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
|
|
|
|
def detach(self):
|
|
if self.socket != None:
|
|
if hasattr(self.socket, "close"):
|
|
if callable(self.socket.close):
|
|
RNS.log("Detaching "+str(self), RNS.LOG_DEBUG)
|
|
self.detached = True
|
|
|
|
try:
|
|
self.socket.shutdown(socket.SHUT_RDWR)
|
|
except Exception as e:
|
|
RNS.log("Error while shutting down socket for "+str(self)+": "+str(e))
|
|
|
|
try:
|
|
self.socket.close()
|
|
except Exception as e:
|
|
RNS.log("Error while closing socket for "+str(self)+": "+str(e))
|
|
|
|
self.socket = None
|
|
|
|
def connect(self, initial=False):
|
|
try:
|
|
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
self.socket.connect((self.target_ip, self.target_port))
|
|
self.online = True
|
|
|
|
except Exception as e:
|
|
if initial:
|
|
RNS.log("Initial connection for "+str(self)+" could not be established: "+str(e), RNS.LOG_ERROR)
|
|
RNS.log("Leaving unconnected and retrying connection in "+str(TCPClientInterface.RECONNECT_WAIT)+" seconds.", RNS.LOG_ERROR)
|
|
return False
|
|
|
|
else:
|
|
raise e
|
|
|
|
if platform.system() == "Linux":
|
|
self.set_timeouts_linux()
|
|
elif platform.system() == "Darwin":
|
|
self.set_timeouts_osx()
|
|
|
|
self.online = True
|
|
self.writing = False
|
|
self.never_connected = False
|
|
|
|
return True
|
|
|
|
|
|
def reconnect(self):
|
|
if self.initiator:
|
|
if not self.reconnecting:
|
|
self.reconnecting = True
|
|
attempts = 0
|
|
while not self.online:
|
|
time.sleep(TCPClientInterface.RECONNECT_WAIT)
|
|
attempts += 1
|
|
|
|
if self.max_reconnect_tries != None and attempts > self.max_reconnect_tries:
|
|
RNS.log("Max reconnection attempts reached for "+str(self), RNS.LOG_ERROR)
|
|
self.teardown()
|
|
break
|
|
|
|
try:
|
|
self.connect()
|
|
|
|
except Exception as e:
|
|
RNS.log("Connection attempt for "+str(self)+" failed: "+str(e), RNS.LOG_DEBUG)
|
|
|
|
if not self.never_connected:
|
|
RNS.log("Reconnected TCP socket for "+str(self)+".", RNS.LOG_INFO)
|
|
|
|
self.reconnecting = False
|
|
thread = threading.Thread(target=self.read_loop)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
RNS.Transport.synthesize_tunnel(self)
|
|
|
|
else:
|
|
RNS.log("Attempt to reconnect on a non-initiator TCP interface. This should not happen.", RNS.LOG_ERROR)
|
|
raise IOError("Attempt to reconnect on a non-initiator TCP interface")
|
|
|
|
def processIncoming(self, data):
|
|
self.rxb += len(data)
|
|
if hasattr(self, "parent_interface") and self.parent_interface != None:
|
|
self.parent_interface.rxb += len(data)
|
|
|
|
self.owner.inbound(data, self)
|
|
|
|
def processOutgoing(self, data):
|
|
if self.online:
|
|
while self.writing:
|
|
time.sleep(0.01)
|
|
|
|
try:
|
|
self.writing = True
|
|
data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG])
|
|
self.socket.sendall(data)
|
|
self.writing = False
|
|
self.txb += len(data)
|
|
if hasattr(self, "parent_interface") and self.parent_interface != None:
|
|
self.parent_interface.txb += len(data)
|
|
|
|
except Exception as e:
|
|
RNS.log("Exception occurred while transmitting via "+str(self)+", tearing down interface", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
self.teardown()
|
|
|
|
|
|
def read_loop(self):
|
|
try:
|
|
in_frame = False
|
|
escape = False
|
|
data_buffer = b""
|
|
|
|
while True:
|
|
data_in = self.socket.recv(4096)
|
|
if len(data_in) > 0:
|
|
pointer = 0
|
|
while pointer < len(data_in):
|
|
byte = data_in[pointer]
|
|
pointer += 1
|
|
if (in_frame and byte == HDLC.FLAG):
|
|
in_frame = False
|
|
self.processIncoming(data_buffer)
|
|
elif (byte == HDLC.FLAG):
|
|
in_frame = True
|
|
data_buffer = b""
|
|
elif (in_frame and len(data_buffer) < RNS.Reticulum.MTU):
|
|
if (byte == HDLC.ESC):
|
|
escape = True
|
|
else:
|
|
if (escape):
|
|
if (byte == HDLC.FLAG ^ HDLC.ESC_MASK):
|
|
byte = HDLC.FLAG
|
|
if (byte == HDLC.ESC ^ HDLC.ESC_MASK):
|
|
byte = HDLC.ESC
|
|
escape = False
|
|
data_buffer = data_buffer+bytes([byte])
|
|
else:
|
|
self.online = False
|
|
if self.initiator and not self.detached:
|
|
RNS.log("TCP socket for "+str(self)+" was closed, attempting to reconnect...", RNS.LOG_WARNING)
|
|
self.reconnect()
|
|
else:
|
|
RNS.log("TCP socket for remote client "+str(self)+" was closed.", RNS.LOG_VERBOSE)
|
|
self.teardown()
|
|
|
|
break
|
|
|
|
|
|
except Exception as e:
|
|
self.online = False
|
|
RNS.log("An interface error occurred for "+str(self)+", the contained exception was: "+str(e), RNS.LOG_WARNING)
|
|
|
|
if self.initiator:
|
|
RNS.log("Attempting to reconnect...", RNS.LOG_WARNING)
|
|
self.reconnect()
|
|
else:
|
|
self.teardown()
|
|
|
|
def teardown(self):
|
|
if self.initiator and not self.detached:
|
|
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)
|
|
if RNS.Reticulum.panic_on_interface_error:
|
|
RNS.panic()
|
|
|
|
else:
|
|
RNS.log("The interface "+str(self)+" is being torn down.", RNS.LOG_VERBOSE)
|
|
|
|
self.online = False
|
|
self.OUT = False
|
|
self.IN = False
|
|
|
|
if hasattr(self, "parent_interface") and self.parent_interface != None:
|
|
self.parent_interface.clients -= 1
|
|
|
|
if self in RNS.Transport.interfaces:
|
|
RNS.Transport.interfaces.remove(self)
|
|
|
|
|
|
def __str__(self):
|
|
return "TCPInterface["+str(self.name)+"/"+str(self.target_ip)+":"+str(self.target_port)+"]"
|
|
|
|
|
|
class TCPServerInterface(Interface):
|
|
@staticmethod
|
|
def get_address_for_if(name):
|
|
return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['addr']
|
|
|
|
def get_broadcast_for_if(name):
|
|
return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['broadcast']
|
|
|
|
def __init__(self, owner, name, device=None, bindip=None, bindport=None):
|
|
self.rxb = 0
|
|
self.txb = 0
|
|
self.online = False
|
|
self.clients = 0
|
|
|
|
self.IN = True
|
|
self.OUT = False
|
|
self.name = name
|
|
|
|
if device != None:
|
|
bindip = TCPServerInterface.get_address_for_if(device)
|
|
|
|
if (bindip != None and bindport != None):
|
|
self.receives = True
|
|
self.bind_ip = bindip
|
|
self.bind_port = bindport
|
|
|
|
def handlerFactory(callback):
|
|
def createHandler(*args, **keys):
|
|
return TCPInterfaceHandler(callback, *args, **keys)
|
|
return createHandler
|
|
|
|
self.owner = owner
|
|
address = (self.bind_ip, self.bind_port)
|
|
|
|
ThreadingTCPServer.allow_reuse_address = True
|
|
self.server = ThreadingTCPServer(address, handlerFactory(self.incoming_connection))
|
|
|
|
thread = threading.Thread(target=self.server.serve_forever)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
|
|
self.online = True
|
|
|
|
|
|
def incoming_connection(self, handler):
|
|
RNS.log("Accepting incoming TCP connection", RNS.LOG_VERBOSE)
|
|
interface_name = "Client on "+self.name
|
|
spawned_interface = TCPClientInterface(self.owner, interface_name, target_ip=None, target_port=None, connected_socket=handler.request)
|
|
spawned_interface.OUT = self.OUT
|
|
spawned_interface.IN = self.IN
|
|
spawned_interface.target_ip = handler.client_address[0]
|
|
spawned_interface.target_port = str(handler.client_address[1])
|
|
spawned_interface.parent_interface = self
|
|
spawned_interface.online = True
|
|
RNS.log("Spawned new TCPClient Interface: "+str(spawned_interface), RNS.LOG_VERBOSE)
|
|
RNS.Transport.interfaces.append(spawned_interface)
|
|
self.clients += 1
|
|
spawned_interface.read_loop()
|
|
|
|
def processOutgoing(self, data):
|
|
pass
|
|
|
|
def __str__(self):
|
|
return "TCPServerInterface["+self.name+"/"+self.bind_ip+":"+str(self.bind_port)+"]"
|
|
|
|
class TCPInterfaceHandler(socketserver.BaseRequestHandler):
|
|
def __init__(self, callback, *args, **keys):
|
|
self.callback = callback
|
|
socketserver.BaseRequestHandler.__init__(self, *args, **keys)
|
|
|
|
def handle(self):
|
|
self.callback(handler=self) |