Reticulum/RNS/Interfaces/I2PInterface.py
2022-02-23 21:29:18 +01:00

544 lines
20 KiB
Python

from .Interface import Interface
import socketserver
import threading
import platform
import socket
import time
import sys
import os
import RNS
import asyncio
# TODO: Remove
import logging
logging.basicConfig()
logging.getLogger().setLevel(logging.DEBUG)
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 KISS():
FEND = 0xC0
FESC = 0xDB
TFEND = 0xDC
TFESC = 0xDD
CMD_DATA = 0x00
CMD_UNKNOWN = 0xFE
@staticmethod
def escape(data):
data = data.replace(bytes([0xdb]), bytes([0xdb, 0xdd]))
data = data.replace(bytes([0xc0]), bytes([0xdb, 0xdc]))
return data
class I2PController:
def __init__(self, rns_storagepath):
import RNS.vendor.i2plib as i2plib
import RNS.vendor.i2plib.utils
self.loop = None
self.i2plib = i2plib
self.utils = i2plib.utils
self.sam_address = i2plib.get_sam_address()
self.storagepath = rns_storagepath+"/i2p"
if not os.path.isdir(self.storagepath):
os.makedirs(self.storagepath)
def start(self):
asyncio.set_event_loop(asyncio.new_event_loop())
self.loop = asyncio.get_event_loop()
try:
self.loop.run_forever()
except Exception as e:
RNS.log("Exception on event loop for "+str(self)+": "+str(e), RNS.LOG_ERROR)
finally:
self.loop.close()
RNS.log("EVENT LOOP DOWN")
def stop(self):
for task in asyncio.Task.all_tasks(loop=self.loop):
task.cancel()
self.loop.stop()
def get_free_port(self):
return self.i2plib.utils.get_free_port()
def client_tunnel(self, owner, i2p_destination):
try:
async def tunnel_up():
RNS.log("Bringing up I2P tunnel to "+str(owner)+" in background, this may take a while...", RNS.LOG_INFO)
tunnel = self.i2plib.ClientTunnel(i2p_destination, owner.local_addr, sam_address=self.sam_address)
await tunnel.run()
RNS.log(str(owner)+ " tunnel setup complete", RNS.LOG_VERBOSE)
asyncio.run_coroutine_threadsafe(tunnel_up(), self.loop)
except Exception as e:
raise IOError("Could not connect to I2P SAM API while configuring to "+str(owner)+". Check that I2P is running and SAM is enabled.")
def server_tunnel(self, owner):
i2p_dest_hash = RNS.Identity.full_hash(RNS.Identity.full_hash(owner.name.encode("utf-8")))
i2p_keyfile = self.storagepath+"/"+RNS.hexrep(i2p_dest_hash, delimit=False)+".i2p"
i2p_dest = None
if not os.path.isfile(i2p_keyfile):
coro = self.i2plib.new_destination(sam_address=self.sam_address, loop=self.loop)
i2p_dest = asyncio.run_coroutine_threadsafe(coro, self.loop).result()
key_file = open(i2p_keyfile, "w")
key_file.write(i2p_dest.private_key.base64)
key_file.close()
# TODO: Remove
RNS.log("Created")
else:
key_file = open(i2p_keyfile, "r")
prvd = key_file.read()
key_file.close()
i2p_dest = self.i2plib.Destination(data=prvd, has_private_key=True)
# TODO: Remove
RNS.log("Loaded")
i2p_b32 = i2p_dest.base32
try:
async def tunnel_up():
RNS.log(str(owner)+" Bringing up I2P tunnel in background, this may take a while...", RNS.LOG_INFO)
tunnel = self.i2plib.ServerTunnel((owner.bind_ip, owner.bind_port), loop=self.loop, destination=i2p_dest, sam_address=self.sam_address)
await tunnel.run()
RNS.log(str(owner)+ " tunnel setup complete, instance reachable at: "+str(i2p_dest.base32)+".b32.i2p", RNS.LOG_VERBOSE)
asyncio.run_coroutine_threadsafe(tunnel_up(), self.loop)
except Exception as e:
raise IOError("Could not connect to I2P SAM API while configuring "+str(self)+". Check that I2P is running and SAM is enabled.")
def get_loop(self):
return asyncio.get_event_loop()
class ThreadingI2PServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
pass
class I2PInterfacePeer(Interface):
RECONNECT_WAIT = 10
RECONNECT_MAX_TRIES = None
# TCP socket options
TCP_USER_TIMEOUT = 20
TCP_PROBE_AFTER = 5
TCP_PROBE_INTERVAL = 3
TCP_PROBES = 5
I2P_USER_TIMEOUT = 40
I2P_PROBE_AFTER = 10
I2P_PROBE_INTERVAL = 5
I2P_PROBES = 6
def __init__(self, owner, name, target_i2p_dest=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
self.kiss_framing = False
self.i2p_tunneled = True
self.i2p_dest = None
self.i2p_tunnel_ready = False
if max_reconnect_tries == None:
self.max_reconnect_tries = I2PInterfacePeer.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_i2p_dest != None:
self.receives = True
self.initiator = True
self.bind_ip = "127.0.0.1"
self.bind_port = self.owner.i2p.get_free_port()
self.local_addr = (self.bind_ip, self.bind_port)
self.target_ip = self.bind_ip
self.target_port = self.bind_port
self.owner.i2p.client_tunnel(self, target_i2p_dest)
# TODO: Remove
RNS.log("TCP params: "+str((self.bind_ip, self.bind_port)))
if not self.connect(initial=True):
# TODO: Remove
RNS.log("Initial TCP attempt failed, trying reconnects...")
thread = threading.Thread(target=self.reconnect)
thread.setDaemon(True)
thread.start()
else:
# TODO: Remove
RNS.log("Initial TCP attempt OK, entering read loop")
thread = threading.Thread(target=self.read_loop)
thread.setDaemon(True)
thread.start()
if not self.kiss_framing:
self.wants_tunnel = True
def set_timeouts_linux(self):
if not self.i2p_tunneled:
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_USER_TIMEOUT, int(I2PInterfacePeer.TCP_USER_TIMEOUT * 1000))
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, int(I2PInterfacePeer.TCP_PROBE_AFTER))
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(I2PInterfacePeer.TCP_PROBE_INTERVAL))
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(I2PInterfacePeer.TCP_PROBES))
else:
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_USER_TIMEOUT, int(I2PInterfacePeer.I2P_USER_TIMEOUT * 1000))
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, int(I2PInterfacePeer.I2P_PROBE_AFTER))
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, int(I2PInterfacePeer.I2P_PROBE_INTERVAL))
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, int(I2PInterfacePeer.I2P_PROBES))
def set_timeouts_osx(self):
if hasattr(socket, "TCP_KEEPALIVE"):
TCP_KEEPIDLE = socket.TCP_KEEPALIVE
else:
TCP_KEEPIDLE = 0x10
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
if not self.i2p_tunneled:
self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(I2PInterfacePeer.TCP_PROBE_AFTER))
else:
self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(I2PInterfacePeer.I2P_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(I2PInterfacePeer.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(I2PInterfacePeer.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()
if not self.kiss_framing:
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
if self.kiss_framing:
data = bytes([KISS.FEND])+bytes([KISS.CMD_DATA])+KISS.escape(data)+bytes([KISS.FEND])
else:
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""
command = KISS.CMD_UNKNOWN
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 self.kiss_framing:
# Read loop for KISS framing
if (in_frame and byte == KISS.FEND and command == KISS.CMD_DATA):
in_frame = False
self.processIncoming(data_buffer)
elif (byte == KISS.FEND):
in_frame = True
command = KISS.CMD_UNKNOWN
data_buffer = b""
elif (in_frame and len(data_buffer) < RNS.Reticulum.MTU):
if (len(data_buffer) == 0 and command == KISS.CMD_UNKNOWN):
# We only support one HDLC port for now, so
# strip off the port nibble
byte = byte & 0x0F
command = byte
elif (command == KISS.CMD_DATA):
if (byte == KISS.FESC):
escape = True
else:
if (escape):
if (byte == KISS.TFEND):
byte = KISS.FEND
if (byte == KISS.TFESC):
byte = KISS.FESC
escape = False
data_buffer = data_buffer+bytes([byte])
else:
# Read loop for HDLC framing
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:
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):
self.rxb = 0
self.txb = 0
self.online = False
self.clients = 0
self.owner = owner
self.i2p_tunneled = True
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()
# TODO: Remove
RNS.log("Started TCP server for I2P on "+str(self.address)+" "+str(self.server))
self.i2p.server_tunnel(self)
if peers != None:
for peer_addr in peers:
interface_name = peer_addr
peer_interface = I2PInterfacePeer(self, interface_name, peer_addr)
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.owner, interface_name, connected_socket=handler.request)
spawned_interface.OUT = self.OUT
spawned_interface.IN = self.IN
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)