mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-11-05 05:40:14 +00:00
616 lines
24 KiB
Python
616 lines
24 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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import asyncio
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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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# TODO: Neater shutdown of the event loop and
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# better error handling is needed. Sometimes
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# errors occur in I2P that leave tunnel setup
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# hanging indefinitely, and right now we have
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# no way of catching it. Sometimes the server
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# and client tasks are also not cancelled on
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# shutdown, which leads to errors dumped to
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# the console. This should also be remedied.
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class I2PController:
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def __init__(self, rns_storagepath):
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import RNS.vendor.i2plib as i2plib
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import RNS.vendor.i2plib.utils
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self.client_tunnels = {}
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self.server_tunnels = {}
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self.loop = None
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self.i2plib = i2plib
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self.utils = i2plib.utils
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self.sam_address = i2plib.get_sam_address()
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self.storagepath = rns_storagepath+"/i2p"
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if not os.path.isdir(self.storagepath):
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os.makedirs(self.storagepath)
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def start(self):
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asyncio.set_event_loop(asyncio.new_event_loop())
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self.loop = asyncio.get_event_loop()
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try:
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self.loop.run_forever()
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except Exception as e:
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RNS.log("Exception on event loop for "+str(self)+": "+str(e), RNS.LOG_ERROR)
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finally:
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self.loop.close()
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def stop(self):
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for task in asyncio.Task.all_tasks(loop=self.loop):
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task.cancel()
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self.loop.stop()
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def get_free_port(self):
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return self.i2plib.utils.get_free_port()
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def client_tunnel(self, owner, i2p_destination):
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self.client_tunnels[i2p_destination] = False
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while True:
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if not self.client_tunnels[i2p_destination]:
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try:
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async def tunnel_up():
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RNS.log("Bringing up I2P tunnel to "+str(owner)+", this may take a while...", RNS.LOG_INFO)
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tunnel = self.i2plib.ClientTunnel(i2p_destination, owner.local_addr, sam_address=self.sam_address, loop=self.loop)
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await tunnel.run()
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owner.awaiting_i2p_tunnel = False
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RNS.log(str(owner)+ " tunnel setup complete", RNS.LOG_VERBOSE)
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try:
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self.loop.ext_owner = self
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future = asyncio.run_coroutine_threadsafe(tunnel_up(), self.loop).result()
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self.client_tunnels[i2p_destination] = True
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except Exception as e:
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RNS.log("Error while setting up I2P tunnel: "+str(e))
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raise e
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except Exception as e:
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raise IOError("Could not connect to I2P SAM API while configuring to "+str(owner)+". Check that I2P is running and SAM is enabled.")
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time.sleep(5)
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def server_tunnel(self, owner):
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i2p_dest_hash = RNS.Identity.full_hash(RNS.Identity.full_hash(owner.name.encode("utf-8")))
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i2p_keyfile = self.storagepath+"/"+RNS.hexrep(i2p_dest_hash, delimit=False)+".i2p"
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i2p_dest = None
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if not os.path.isfile(i2p_keyfile):
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coro = self.i2plib.new_destination(sam_address=self.sam_address, loop=self.loop)
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i2p_dest = asyncio.run_coroutine_threadsafe(coro, self.loop).result()
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key_file = open(i2p_keyfile, "w")
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key_file.write(i2p_dest.private_key.base64)
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key_file.close()
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else:
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key_file = open(i2p_keyfile, "r")
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prvd = key_file.read()
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key_file.close()
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i2p_dest = self.i2plib.Destination(data=prvd, has_private_key=True)
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i2p_b32 = i2p_dest.base32
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owner.b32 = i2p_b32
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self.server_tunnels[i2p_b32] = False
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while self.server_tunnels[i2p_b32] == False:
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try:
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async def tunnel_up():
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RNS.log(str(owner)+" Bringing up I2P endpoint, this may take a while...", RNS.LOG_INFO)
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tunnel = self.i2plib.ServerTunnel((owner.bind_ip, owner.bind_port), loop=self.loop, destination=i2p_dest, sam_address=self.sam_address)
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await tunnel.run()
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RNS.log(str(owner)+ " endpoint setup complete. Now reachable at: "+str(i2p_dest.base32)+".b32.i2p", RNS.LOG_VERBOSE)
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asyncio.run_coroutine_threadsafe(tunnel_up(), self.loop).result()
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self.server_tunnels[i2p_b32] = True
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except Exception as e:
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raise IOError("Could not connect to I2P SAM API while configuring "+str(self)+". Check that I2P is running and SAM is enabled.")
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time.sleep(5)
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def get_loop(self):
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return asyncio.get_event_loop()
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class ThreadingI2PServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
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pass
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class I2PInterfacePeer(Interface):
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RECONNECT_WAIT = 15
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RECONNECT_MAX_TRIES = None
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# TCP socket options
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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, parent_interface, owner, name, target_i2p_dest=None, connected_socket=None, max_reconnect_tries=None):
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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 = parent_interface
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self.parent_count = True
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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 = False
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self.i2p_tunneled = True
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self.i2p_dest = None
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self.i2p_tunnel_ready = False
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self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
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if max_reconnect_tries == None:
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self.max_reconnect_tries = I2PInterfacePeer.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_i2p_dest != None:
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self.receives = True
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self.initiator = True
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self.bind_ip = "127.0.0.1"
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self.bind_port = self.parent_interface.i2p.get_free_port()
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self.local_addr = (self.bind_ip, self.bind_port)
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self.target_ip = self.bind_ip
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self.target_port = self.bind_port
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self.awaiting_i2p_tunnel = True
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def tunnel_job():
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self.parent_interface.i2p.client_tunnel(self, target_i2p_dest)
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thread = threading.Thread(target=tunnel_job)
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thread.setDaemon(True)
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thread.start()
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def wait_job():
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while self.awaiting_i2p_tunnel:
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time.sleep(0.25)
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if not self.kiss_framing:
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self.wants_tunnel = 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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thread = threading.Thread(target=wait_job)
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thread.setDaemon(True)
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thread.start()
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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(I2PInterfacePeer.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(I2PInterfacePeer.TCP_PROBE_AFTER))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(I2PInterfacePeer.TCP_PROBE_INTERVAL))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(I2PInterfacePeer.TCP_PROBES))
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else:
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_USER_TIMEOUT, int(I2PInterfacePeer.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(I2PInterfacePeer.I2P_PROBE_AFTER))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(I2PInterfacePeer.I2P_PROBE_INTERVAL))
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self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(I2PInterfacePeer.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(I2PInterfacePeer.TCP_PROBE_AFTER))
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else:
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self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(I2PInterfacePeer.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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if not self.awaiting_i2p_tunnel:
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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(I2PInterfacePeer.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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if not self.kiss_framing and self.wants_tunnel:
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RNS.Transport.synthesize_tunnel(self)
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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(I2PInterfacePeer.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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if not self.awaiting_i2p_tunnel:
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RNS.log("Connection attempt for "+str(self)+" failed: "+str(e), RNS.LOG_DEBUG)
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else:
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RNS.log(str(self)+" still waiting for I2P tunnel to appear", RNS.LOG_VERBOSE)
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if not self.never_connected:
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RNS.log(str(self)+" Re-established connection via I2P tunnel", 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 I2P interface. This should not happen.", RNS.LOG_ERROR)
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raise IOError("Attempt to reconnect on a non-initiator I2P 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 and self.parent_count:
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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 and self.parent_count:
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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])
|
|
else:
|
|
self.online = False
|
|
if self.initiator and not self.detached:
|
|
RNS.log("Socket for "+str(self)+" was closed, attempting to reconnect...", RNS.LOG_WARNING)
|
|
self.reconnect()
|
|
else:
|
|
RNS.log("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:
|
|
if not self.initiator:
|
|
RNS.Transport.interfaces.remove(self)
|
|
|
|
|
|
def __str__(self):
|
|
return "I2PInterfacePeer["+str(self.name)+"]"
|
|
|
|
|
|
class I2PInterface(Interface):
|
|
|
|
def __init__(self, owner, name, rns_storagepath, peers, connectable = True):
|
|
self.rxb = 0
|
|
self.txb = 0
|
|
self.online = False
|
|
self.clients = 0
|
|
self.owner = owner
|
|
self.connectable = connectable
|
|
self.i2p_tunneled = True
|
|
self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
|
|
|
|
self.b32 = None
|
|
self.i2p = I2PController(rns_storagepath)
|
|
|
|
self.IN = True
|
|
self.OUT = False
|
|
self.name = name
|
|
|
|
|
|
self.receives = True
|
|
self.bind_ip = "127.0.0.1"
|
|
self.bind_port = self.i2p.get_free_port()
|
|
self.address = (self.bind_ip, self.bind_port)
|
|
|
|
i2p_thread = threading.Thread(target=self.i2p.start)
|
|
i2p_thread.setDaemon(True)
|
|
i2p_thread.start()
|
|
|
|
def handlerFactory(callback):
|
|
def createHandler(*args, **keys):
|
|
return I2PInterfaceHandler(callback, *args, **keys)
|
|
return createHandler
|
|
|
|
ThreadingI2PServer.allow_reuse_address = True
|
|
self.server = ThreadingI2PServer(self.address, handlerFactory(self.incoming_connection))
|
|
|
|
thread = threading.Thread(target=self.server.serve_forever)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
|
|
if self.connectable:
|
|
def tunnel_job():
|
|
self.i2p.server_tunnel(self)
|
|
|
|
thread = threading.Thread(target=tunnel_job)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
|
|
if peers != None:
|
|
for peer_addr in peers:
|
|
interface_name = peer_addr
|
|
peer_interface = I2PInterfacePeer(self, self.owner, interface_name, peer_addr)
|
|
peer_interface.OUT = True
|
|
peer_interface.IN = True
|
|
peer_interface.parent_interface = self
|
|
peer_interface.parent_count = False
|
|
RNS.Transport.interfaces.append(peer_interface)
|
|
|
|
self.online = True
|
|
|
|
|
|
def incoming_connection(self, handler):
|
|
RNS.log("Accepting incoming I2P connection", RNS.LOG_VERBOSE)
|
|
interface_name = "Connected peer on "+self.name
|
|
spawned_interface = I2PInterfacePeer(self, self.owner, interface_name, connected_socket=handler.request)
|
|
spawned_interface.OUT = True
|
|
spawned_interface.IN = True
|
|
spawned_interface.parent_interface = self
|
|
spawned_interface.online = True
|
|
RNS.log("Spawned new I2PInterface Peer: "+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 detach(self):
|
|
self.i2p.stop()
|
|
|
|
def __str__(self):
|
|
return "I2PInterface["+self.name+"]"
|
|
|
|
class I2PInterfaceHandler(socketserver.BaseRequestHandler):
|
|
def __init__(self, callback, *args, **keys):
|
|
self.callback = callback
|
|
socketserver.BaseRequestHandler.__init__(self, *args, **keys)
|
|
|
|
def handle(self):
|
|
self.callback(handler=self)
|