Reticulum/RNS/Interfaces/LocalInterface.py
2021-09-24 14:10:18 +02:00

193 lines
6.8 KiB
Python

from .Interface import Interface
import socketserver
import threading
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 LocalClientInterface(Interface):
def __init__(self, owner, name, target_port = None, connected_socket=None):
self.IN = True
self.OUT = False
self.socket = None
self.parent_interface = None
self.name = name
if connected_socket != None:
self.receives = True
self.target_ip = None
self.target_port = None
self.socket = connected_socket
elif target_port != None:
self.receives = True
self.target_ip = "127.0.0.1"
self.target_port = target_port
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.connect((self.target_ip, self.target_port))
self.is_connected_to_shared_instance = True
self.owner = owner
self.online = True
self.writing = False
if connected_socket == None:
thread = threading.Thread(target=self.read_loop)
thread.setDaemon(True)
thread.start()
def processIncoming(self, 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
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:
RNS.log("Socket for "+str(self)+" was closed, tearing down interface", RNS.LOG_VERBOSE)
self.teardown(nowarning=True)
break
except Exception as e:
self.online = False
RNS.log("An interface error occurred, the contained exception was: "+str(e), RNS.LOG_ERROR)
RNS.log("Tearing down "+str(self), RNS.LOG_ERROR)
self.teardown()
def teardown(self, nowarning=False):
self.online = False
self.OUT = False
self.IN = False
if self in RNS.Transport.interfaces:
RNS.Transport.interfaces.remove(self)
if self in RNS.Transport.local_client_interfaces:
RNS.Transport.local_client_interfaces.remove(self)
if nowarning == False:
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()
def __str__(self):
return "LocalInterface["+str(self.target_port)+"]"
class LocalServerInterface(Interface):
def __init__(self, owner, bindport=None):
self.IN = True
self.OUT = False
self.name = "Reticulum"
if (bindport != None):
self.receives = True
self.bind_ip = "127.0.0.1"
self.bind_port = bindport
def handlerFactory(callback):
def createHandler(*args, **keys):
return LocalInterfaceHandler(callback, *args, **keys)
return createHandler
self.owner = owner
self.is_local_shared_instance = True
address = (self.bind_ip, self.bind_port)
self.server = ThreadingTCPServer(address, handlerFactory(self.incoming_connection))
thread = threading.Thread(target=self.server.serve_forever)
thread.setDaemon(True)
thread.start()
def incoming_connection(self, handler):
interface_name = str(str(handler.client_address[1]))
spawned_interface = LocalClientInterface(self.owner, name=interface_name, 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
RNS.log("Accepting new connection to shared instance: "+str(spawned_interface), RNS.LOG_VERBOSE)
RNS.Transport.interfaces.append(spawned_interface)
RNS.Transport.local_client_interfaces.append(spawned_interface)
spawned_interface.read_loop()
def processOutgoing(self, data):
pass
def __str__(self):
return "Shared Instance ["+str(self.bind_port)+"]"
class LocalInterfaceHandler(socketserver.BaseRequestHandler):
def __init__(self, callback, *args, **keys):
self.callback = callback
socketserver.BaseRequestHandler.__init__(self, *args, **keys)
def handle(self):
self.callback(handler=self)