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Reticulum/RNS/Interfaces/I2PInterface.py

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# MIT License
#
# Copyright (c) 2016-2022 Mark Qvist / unsigned.io
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from .Interface import Interface
import socketserver
import threading
import platform
import socket
import time
import sys
import os
import RNS
import asyncio
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
# TODO: Neater shutdown of the event loop and
# better error handling is needed. Sometimes
# errors occur in I2P that leave tunnel setup
# hanging indefinitely, and right now we have
# no way of catching it. Sometimes the server
# and client tasks are also not cancelled on
# shutdown, which leads to errors dumped to
# the console. This should also be remedied.
class I2PController:
def __init__(self, rns_storagepath):
import RNS.vendor.i2plib as i2plib
import RNS.vendor.i2plib.utils
self.client_tunnels = {}
self.server_tunnels = {}
self.i2plib_tunnels = {}
self.loop = None
self.i2plib = i2plib
self.utils = i2plib.utils
self.sam_address = i2plib.get_sam_address()
self.ready = False
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()
time.sleep(0.10)
if self.loop == None:
RNS.log("Could not get event loop for "+str(self)+", waiting for event loop to appear", RNS.LOG_VERBOSE)
while self.loop == None:
self.loop = asyncio.get_event_loop()
sleep(0.25)
try:
self.ready = True
self.loop.run_forever()
except Exception as e:
self.ready = False
RNS.log("Exception on event loop for "+str(self)+": "+str(e), RNS.LOG_ERROR)
finally:
self.loop.close()
def stop(self):
for i2ptunnel in self.i2plib_tunnels:
if hasattr(i2ptunnel, "stop") and callable(i2ptunnel.stop):
i2ptunnel.stop()
if hasattr(asyncio.Task, "all_tasks") and callable(asyncio.Task.all_tasks):
for task in asyncio.Task.all_tasks(loop=self.loop):
task.cancel()
time.sleep(0.2)
self.loop.stop()
def get_free_port(self):
return self.i2plib.utils.get_free_port()
def stop_tunnel(self, i2ptunnel):
if hasattr(i2ptunnel, "stop") and callable(i2ptunnel.stop):
i2ptunnel.stop()
def client_tunnel(self, owner, i2p_destination):
self.client_tunnels[i2p_destination] = False
self.i2plib_tunnels[i2p_destination] = None
while True:
if not self.client_tunnels[i2p_destination]:
try:
async def tunnel_up():
RNS.log("Bringing up I2P tunnel to "+str(owner)+", this may take a while...", RNS.LOG_INFO)
tunnel = self.i2plib.ClientTunnel(i2p_destination, owner.local_addr, sam_address=self.sam_address, loop=self.loop)
self.i2plib_tunnels[i2p_destination] = tunnel
await tunnel.run()
self.loop.ext_owner = self
result = asyncio.run_coroutine_threadsafe(tunnel_up(), self.loop).result()
if not i2p_destination in self.i2plib_tunnels:
raise IOError("No tunnel control instance was created")
else:
tn = self.i2plib_tunnels[i2p_destination]
if tn != None and hasattr(tn, "status"):
RNS.log("Waiting for status from I2P control process", RNS.LOG_EXTREME)
while not tn.status["setup_ran"]:
time.sleep(0.1)
RNS.log("Got status from I2P control process", RNS.LOG_EXTREME)
if tn.status["setup_failed"]:
self.stop_tunnel(tn)
raise tn.status["exception"]
else:
if owner.socket != None:
if hasattr(owner.socket, "close"):
if callable(owner.socket.close):
try:
owner.socket.shutdown(socket.SHUT_RDWR)
except Exception as e:
RNS.log("Error while shutting down socket for "+str(owner)+": "+str(e))
try:
owner.socket.close()
except Exception as e:
RNS.log("Error while closing socket for "+str(owner)+": "+str(e))
self.client_tunnels[i2p_destination] = True
owner.awaiting_i2p_tunnel = False
RNS.log(str(owner)+" tunnel setup complete", RNS.LOG_VERBOSE)
else:
raise IOError("Got no status response from SAM API")
except ConnectionRefusedError as e:
raise e
except ConnectionAbortedError as e:
raise e
except Exception as e:
RNS.log("Unexpected error type from I2P SAM: "+str(e), RNS.LOG_ERROR)
raise e
else:
i2ptunnel = self.i2plib_tunnels[i2p_destination]
if hasattr(i2ptunnel, "status"):
i2p_exception = i2ptunnel.status["exception"]
if i2ptunnel.status["setup_ran"] == False:
RNS.log(str(self)+" I2P tunnel setup did not complete", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
elif i2p_exception != None:
RNS.log("An error ocurred while setting up I2P tunnel to "+str(i2p_destination), RNS.LOG_ERROR)
if isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.CantReachPeer):
RNS.log("The I2P daemon can't reach peer "+str(i2p_destination), RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.DuplicatedDest):
RNS.log("The I2P daemon reported that the destination is already in use", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.DuplicatedId):
RNS.log("The I2P daemon reported that the ID is arleady in use", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.InvalidId):
RNS.log("The I2P daemon reported that the stream session ID doesn't exist", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.InvalidKey):
RNS.log("The I2P daemon reported that the key for "+str(i2p_destination)+" is invalid", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.KeyNotFound):
RNS.log("The I2P daemon could not find the key for "+str(i2p_destination), RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.PeerNotFound):
RNS.log("The I2P daemon mould not find the peer "+str(i2p_destination), RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.I2PError):
RNS.log("The I2P daemon experienced an unspecified error", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.Timeout):
RNS.log("I2P daemon timed out while setting up client tunnel to "+str(i2p_destination), RNS.LOG_ERROR)
RNS.log("Resetting I2P tunnel and retrying later", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
elif i2ptunnel.status["setup_failed"] == True:
RNS.log(str(self)+" Unspecified I2P tunnel setup error, resetting I2P tunnel", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
else:
RNS.log(str(self)+" Got no status from SAM API, resetting I2P tunnel", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
# Wait for status from I2P control process
time.sleep(5)
def server_tunnel(self, owner):
while RNS.Transport.identity == None:
time.sleep(1)
# Old format
i2p_dest_hash_of = RNS.Identity.full_hash(RNS.Identity.full_hash(owner.name.encode("utf-8")))
i2p_keyfile_of = self.storagepath+"/"+RNS.hexrep(i2p_dest_hash_of, delimit=False)+".i2p"
# New format
i2p_dest_hash_nf = RNS.Identity.full_hash(RNS.Identity.full_hash(owner.name.encode("utf-8"))+RNS.Identity.full_hash(RNS.Transport.identity.hash))
i2p_keyfile_nf = self.storagepath+"/"+RNS.hexrep(i2p_dest_hash_nf, delimit=False)+".i2p"
# Use old format if a key is already present
if os.path.isfile(i2p_keyfile_of):
i2p_keyfile = i2p_keyfile_of
else:
i2p_keyfile = i2p_keyfile_nf
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()
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)
i2p_b32 = i2p_dest.base32
owner.b32 = i2p_b32
self.server_tunnels[i2p_b32] = False
self.i2plib_tunnels[i2p_b32] = None
while True:
if self.server_tunnels[i2p_b32] == False:
try:
async def tunnel_up():
RNS.log(str(owner)+" Bringing up I2P endpoint, 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)
self.i2plib_tunnels[i2p_b32] = tunnel
await tunnel.run()
owner.online = True
RNS.log(str(owner)+ " endpoint setup complete. Now reachable at: "+str(i2p_dest.base32)+".b32.i2p", RNS.LOG_VERBOSE)
asyncio.run_coroutine_threadsafe(tunnel_up(), self.loop).result()
self.server_tunnels[i2p_b32] = True
except Exception as e:
raise e
else:
i2ptunnel = self.i2plib_tunnels[i2p_b32]
if hasattr(i2ptunnel, "status"):
i2p_exception = i2ptunnel.status["exception"]
if i2ptunnel.status["setup_ran"] == False:
RNS.log(str(self)+" I2P tunnel setup did not complete", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
elif i2p_exception != None:
RNS.log("An error ocurred while setting up I2P tunnel", RNS.LOG_ERROR)
if isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.CantReachPeer):
RNS.log("The I2P daemon can't reach peer "+str(i2p_destination), RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.DuplicatedDest):
RNS.log("The I2P daemon reported that the destination is already in use", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.DuplicatedId):
RNS.log("The I2P daemon reported that the ID is arleady in use", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.InvalidId):
RNS.log("The I2P daemon reported that the stream session ID doesn't exist", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.InvalidKey):
RNS.log("The I2P daemon reported that the key for "+str(i2p_destination)+" is invalid", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.KeyNotFound):
RNS.log("The I2P daemon could not find the key for "+str(i2p_destination), RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.PeerNotFound):
RNS.log("The I2P daemon mould not find the peer "+str(i2p_destination), RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.I2PError):
RNS.log("The I2P daemon experienced an unspecified error", RNS.LOG_ERROR)
elif isinstance(i2p_exception, RNS.vendor.i2plib.exceptions.Timeout):
RNS.log("I2P daemon timed out while setting up client tunnel to "+str(i2p_destination), RNS.LOG_ERROR)
RNS.log("Resetting I2P tunnel and retrying later", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
elif i2ptunnel.status["setup_failed"] == True:
RNS.log(str(self)+" Unspecified I2P tunnel setup error, resetting I2P tunnel", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
else:
RNS.log(str(self)+" Got no status from SAM API, resetting I2P tunnel", RNS.LOG_ERROR)
self.stop_tunnel(i2ptunnel)
return False
time.sleep(5)
def get_loop(self):
return asyncio.get_event_loop()
class ThreadingI2PServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
pass
class I2PInterfacePeer(Interface):
RECONNECT_WAIT = 15
RECONNECT_MAX_TRIES = None
# TCP socket options
I2P_USER_TIMEOUT = 45
I2P_PROBE_AFTER = 10
I2P_PROBE_INTERVAL = 9
I2P_PROBES = 5
I2P_READ_TIMEOUT = (I2P_PROBE_INTERVAL * I2P_PROBES + I2P_PROBE_AFTER)*2
TUNNEL_STATE_INIT = 0x00
TUNNEL_STATE_ACTIVE = 0x01
TUNNEL_STATE_STALE = 0x02
def __init__(self, parent_interface, owner, name, target_i2p_dest=None, connected_socket=None, max_reconnect_tries=None):
super().__init__()
self.HW_MTU = 1064
self.IN = True
self.OUT = False
self.socket = None
self.parent_interface = parent_interface
self.parent_count = True
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
self.mode = RNS.Interfaces.Interface.Interface.MODE_FULL
self.bitrate = I2PInterface.BITRATE_GUESS
self.last_read = 0
self.last_write = 0
self.wd_reset = False
self.i2p_tunnel_state = I2PInterfacePeer.TUNNEL_STATE_INIT
self.ifac_size = self.parent_interface.ifac_size
self.ifac_netname = self.parent_interface.ifac_netname
self.ifac_netkey = self.parent_interface.ifac_netkey
if self.ifac_netname != None or self.ifac_netkey != None:
ifac_origin = b""
if self.ifac_netname != None:
ifac_origin += RNS.Identity.full_hash(self.ifac_netname.encode("utf-8"))
if self.ifac_netkey != None:
ifac_origin += RNS.Identity.full_hash(self.ifac_netkey.encode("utf-8"))
ifac_origin_hash = RNS.Identity.full_hash(ifac_origin)
self.ifac_key = RNS.Cryptography.hkdf(
length=64,
derive_from=ifac_origin_hash,
salt=RNS.Reticulum.IFAC_SALT,
context=None
)
self.ifac_identity = RNS.Identity.from_bytes(self.ifac_key)
self.ifac_signature = self.ifac_identity.sign(RNS.Identity.full_hash(self.ifac_key))
self.announce_rate_target = None
self.announce_rate_grace = None
self.announce_rate_penalty = None
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.awaiting_i2p_tunnel = True
def tunnel_job():
while self.awaiting_i2p_tunnel:
try:
self.bind_port = self.parent_interface.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
if not self.parent_interface.i2p.client_tunnel(self, target_i2p_dest):
RNS.log(str(self)+" I2P control process experienced an error, requesting new tunnel...", RNS.LOG_ERROR)
self.awaiting_i2p_tunnel = True
except Exception as e:
RNS.log("Error while while configuring "+str(self)+": "+str(e), RNS.LOG_ERROR)
RNS.log("Check that I2P is installed and running, and that SAM is enabled. Retrying tunnel setup later.", RNS.LOG_ERROR)
time.sleep(8)
thread = threading.Thread(target=tunnel_job)
thread.daemon = True
thread.start()
def wait_job():
while self.awaiting_i2p_tunnel:
time.sleep(0.25)
time.sleep(2)
if not self.kiss_framing:
self.wants_tunnel = True
if not self.connect(initial=True):
thread = threading.Thread(target=self.reconnect)
thread.daemon = True
thread.start()
else:
thread = threading.Thread(target=self.read_loop)
thread.daemon = True
thread.start()
thread = threading.Thread(target=wait_job)
thread.daemon = True
thread.start()
def set_timeouts_linux(self):
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)
self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(I2PInterfacePeer.I2P_PROBE_AFTER))
def shutdown_socket(self, target_socket):
if callable(target_socket.close):
try:
if socket != None:
target_socket.shutdown(socket.SHUT_RDWR)
except Exception as e:
RNS.log("Error while shutting down socket for "+str(self)+": "+str(e))
try:
if socket != None:
target_socket.close()
except Exception as e:
RNS.log("Error while closing socket for "+str(self)+": "+str(e))
def detach(self):
RNS.log("Detaching "+str(self), RNS.LOG_DEBUG)
if self.socket != None:
if hasattr(self.socket, "close"):
if callable(self.socket.close):
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:
if not self.awaiting_i2p_tunnel:
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
if not self.kiss_framing and self.wants_tunnel:
RNS.Transport.synthesize_tunnel(self)
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:
if not self.awaiting_i2p_tunnel:
RNS.log("Connection attempt for "+str(self)+" failed: "+str(e), RNS.LOG_DEBUG)
else:
RNS.log(str(self)+" still waiting for I2P tunnel to appear", RNS.LOG_VERBOSE)
if not self.never_connected:
RNS.log(str(self)+" Re-established connection via I2P tunnel", RNS.LOG_INFO)
self.reconnecting = False
thread = threading.Thread(target=self.read_loop)
thread.daemon = True
thread.start()
if not self.kiss_framing:
RNS.Transport.synthesize_tunnel(self)
else:
RNS.log("Attempt to reconnect on a non-initiator I2P interface. This should not happen.", RNS.LOG_ERROR)
raise IOError("Attempt to reconnect on a non-initiator I2P interface")
def processIncoming(self, data):
self.rxb += len(data)
if hasattr(self, "parent_interface") and self.parent_interface != None and self.parent_count:
self.parent_interface.rxb += len(data)
self.owner.inbound(data, self)
def processOutgoing(self, data):
if self.online:
while self.writing:
time.sleep(0.001)
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)
self.last_write = time.time()
if hasattr(self, "parent_interface") and self.parent_interface != None and self.parent_count:
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_watchdog(self):
while self.wd_reset:
time.sleep(0.25)
should_run = True
try:
while should_run and not self.wd_reset:
time.sleep(1)
if (time.time()-self.last_read > I2PInterfacePeer.I2P_PROBE_AFTER*2):
if self.i2p_tunnel_state != I2PInterfacePeer.TUNNEL_STATE_STALE:
RNS.log("I2P tunnel became unresponsive", RNS.LOG_DEBUG)
self.i2p_tunnel_state = I2PInterfacePeer.TUNNEL_STATE_STALE
else:
self.i2p_tunnel_state = I2PInterfacePeer.TUNNEL_STATE_ACTIVE
if (time.time()-self.last_write > I2PInterfacePeer.I2P_PROBE_AFTER*1):
try:
if self.socket != None:
self.socket.sendall(bytes([HDLC.FLAG, HDLC.FLAG]))
except Exception as e:
RNS.log("An error ocurred while sending I2P keepalive. The contained exception was: "+str(e), RNS.LOG_ERROR)
self.shutdown_socket(self.socket)
should_run = False
if (time.time()-self.last_read > I2PInterfacePeer.I2P_READ_TIMEOUT):
RNS.log("I2P socket is unresponsive, restarting...", RNS.LOG_WARNING)
if self.socket != None:
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))
should_run = False
self.wd_reset = False
finally:
self.wd_reset = False
def read_loop(self):
try:
self.last_read = time.time()
self.last_write = time.time()
wd_thread = threading.Thread(target=self.read_watchdog, daemon=True).start()
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
self.last_read = time.time()
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) < self.HW_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) < self.HW_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
self.wd_reset = True
time.sleep(2)
self.wd_reset = 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:
if self.parent_interface.clients > 0:
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):
BITRATE_GUESS = 256*1000
def __init__(self, owner, name, rns_storagepath, peers, connectable = False, ifac_size = 16, ifac_netname = None, ifac_netkey = None):
super().__init__()
self.HW_MTU = 1064
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)
self.bitrate = I2PInterface.BITRATE_GUESS
self.ifac_size = ifac_size
self.ifac_netname = ifac_netname
self.ifac_netkey = ifac_netkey
self.online = False
i2p_thread = threading.Thread(target=self.i2p.start)
i2p_thread.daemon = True
i2p_thread.start()
i2p_notready_warning = False
time.sleep(0.25)
if not self.i2p.ready:
RNS.log("I2P controller did not become available in time, waiting for controller", RNS.LOG_VERBOSE)
i2p_notready_warning = True
while not self.i2p.ready:
time.sleep(0.25)
if i2p_notready_warning == True:
RNS.log("I2P controller ready, continuing setup", RNS.LOG_VERBOSE)
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.daemon = True
thread.start()
if self.connectable:
def tunnel_job():
while True:
try:
if not self.i2p.server_tunnel(self):
RNS.log(str(self)+" I2P control process experienced an error, requesting new tunnel...", RNS.LOG_ERROR)
self.online = False
except Exception as e:
RNS.log("Error while while configuring "+str(self)+": "+str(e), RNS.LOG_ERROR)
RNS.log("Check that I2P is installed and running, and that SAM is enabled. Retrying tunnel setup later.", RNS.LOG_ERROR)
time.sleep(15)
thread = threading.Thread(target=tunnel_job)
thread.daemon = True
thread.start()
if peers != None:
for peer_addr in peers:
interface_name = self.name+" to "+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)
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
spawned_interface.bitrate = self.bitrate
spawned_interface.ifac_size = self.ifac_size
spawned_interface.ifac_netname = self.ifac_netname
spawned_interface.ifac_netkey = self.ifac_netkey
if spawned_interface.ifac_netname != None or spawned_interface.ifac_netkey != None:
ifac_origin = b""
if spawned_interface.ifac_netname != None:
ifac_origin += RNS.Identity.full_hash(spawned_interface.ifac_netname.encode("utf-8"))
if spawned_interface.ifac_netkey != None:
ifac_origin += RNS.Identity.full_hash(spawned_interface.ifac_netkey.encode("utf-8"))
ifac_origin_hash = RNS.Identity.full_hash(ifac_origin)
spawned_interface.ifac_key = RNS.Cryptography.hkdf(
length=64,
derive_from=ifac_origin_hash,
salt=RNS.Reticulum.IFAC_SALT,
context=None
)
spawned_interface.ifac_identity = RNS.Identity.from_bytes(spawned_interface.ifac_key)
spawned_interface.ifac_signature = spawned_interface.ifac_identity.sign(RNS.Identity.full_hash(spawned_interface.ifac_key))
spawned_interface.announce_rate_target = self.announce_rate_target
spawned_interface.announce_rate_grace = self.announce_rate_grace
spawned_interface.announce_rate_penalty = self.announce_rate_penalty
spawned_interface.mode = self.mode
spawned_interface.HW_MTU = self.HW_MTU
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 received_announce(self, from_spawned=False):
if from_spawned: self.ia_freq_deque.append(time.time())
def sent_announce(self, from_spawned=False):
if from_spawned: self.oa_freq_deque.append(time.time())
def detach(self):
RNS.log("Detaching "+str(self), RNS.LOG_DEBUG)
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)
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