# 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 socket import struct import time import sys import RNS class AutoInterface(Interface): DEFAULT_DISCOVERY_PORT = 29716 DEFAULT_DATA_PORT = 42671 DEFAULT_GROUP_ID = "reticulum".encode("utf-8") SCOPE_LINK = "2" SCOPE_ADMIN = "4" SCOPE_SITE = "5" SCOPE_ORGANISATION = "8" SCOPE_GLOBAL = "e" PEERING_TIMEOUT = 7.5 DARWIN_IGNORE_IFS = ["awdl0", "llw0", "lo0", "en5"] ANDROID_IGNORE_IFS = ["dummy0", "lo", "tun0"] BITRATE_GUESS = 10*1000*1000 def __init__(self, owner, name, group_id=None, discovery_scope=None, discovery_port=None, data_port=None, allowed_interfaces=None, ignored_interfaces=None, configured_bitrate=None): import importlib if importlib.util.find_spec('netifaces') != None: import netifaces else: RNS.log("Using AutoInterface requires the netifaces module.", RNS.LOG_CRITICAL) RNS.log("You can install it with the command: python3 -m pip install netifaces", RNS.LOG_CRITICAL) RNS.panic() self.netifaces = netifaces self.rxb = 0 self.txb = 0 self.HW_MTU = 1064 self.IN = True self.OUT = False self.name = name self.online = False self.peers = {} self.link_local_addresses = [] self.adopted_interfaces = {} self.multicast_echoes = {} self.timed_out_interfaces = {} self.outbound_udp_socket = None self.announce_rate_target = None self.announce_interval = AutoInterface.PEERING_TIMEOUT/6.0 self.peer_job_interval = AutoInterface.PEERING_TIMEOUT*1.1 self.peering_timeout = AutoInterface.PEERING_TIMEOUT self.multicast_echo_timeout = AutoInterface.PEERING_TIMEOUT/2 if allowed_interfaces == None: self.allowed_interfaces = [] else: self.allowed_interfaces = allowed_interfaces if ignored_interfaces == None: self.ignored_interfaces = [] else: self.ignored_interfaces = ignored_interfaces if group_id == None: self.group_id = AutoInterface.DEFAULT_GROUP_ID else: self.group_id = group_id.encode("utf-8") if discovery_port == None: self.discovery_port = AutoInterface.DEFAULT_DISCOVERY_PORT else: self.discovery_port = discovery_port if data_port == None: self.data_port = AutoInterface.DEFAULT_DATA_PORT else: self.data_port = data_port if discovery_scope == None: self.discovery_scope = AutoInterface.SCOPE_LINK elif str(discovery_scope).lower() == "link": self.discovery_scope = AutoInterface.SCOPE_LINK elif str(discovery_scope).lower() == "admin": self.discovery_scope = AutoInterface.SCOPE_ADMIN elif str(discovery_scope).lower() == "site": self.discovery_scope = AutoInterface.SCOPE_SITE elif str(discovery_scope).lower() == "organisation": self.discovery_scope = AutoInterface.SCOPE_ORGANISATION elif str(discovery_scope).lower() == "global": self.discovery_scope = AutoInterface.SCOPE_GLOBAL self.group_hash = RNS.Identity.full_hash(self.group_id) g = self.group_hash #gt = "{:02x}".format(g[1]+(g[0]<<8)) gt = "0" gt += ":"+"{:02x}".format(g[3]+(g[2]<<8)) gt += ":"+"{:02x}".format(g[5]+(g[4]<<8)) gt += ":"+"{:02x}".format(g[7]+(g[6]<<8)) gt += ":"+"{:02x}".format(g[9]+(g[8]<<8)) gt += ":"+"{:02x}".format(g[11]+(g[10]<<8)) gt += ":"+"{:02x}".format(g[13]+(g[12]<<8)) self.mcast_discovery_address = "ff1"+self.discovery_scope+":"+gt suitable_interfaces = 0 for ifname in self.netifaces.interfaces(): if RNS.vendor.platformutils.is_darwin() and ifname in AutoInterface.DARWIN_IGNORE_IFS and not ifname in self.allowed_interfaces: RNS.log(str(self)+" skipping Darwin AWDL or tethering interface "+str(ifname), RNS.LOG_EXTREME) elif RNS.vendor.platformutils.is_darwin() and ifname == "lo0": RNS.log(str(self)+" skipping Darwin loopback interface "+str(ifname), RNS.LOG_EXTREME) elif RNS.vendor.platformutils.is_android() and ifname in AutoInterface.ANDROID_IGNORE_IFS and not ifname in self.allowed_interfaces: RNS.log(str(self)+" skipping Android system interface "+str(ifname), RNS.LOG_EXTREME) elif ifname in self.ignored_interfaces: RNS.log(str(self)+" ignoring disallowed interface "+str(ifname), RNS.LOG_EXTREME) else: if len(self.allowed_interfaces) > 0 and not ifname in self.allowed_interfaces: RNS.log(str(self)+" ignoring interface "+str(ifname)+" since it was not allowed", RNS.LOG_EXTREME) else: addresses = self.netifaces.ifaddresses(ifname) if self.netifaces.AF_INET6 in addresses: link_local_addr = None for address in addresses[self.netifaces.AF_INET6]: if "addr" in address: if address["addr"].startswith("fe80:"): link_local_addr = address["addr"] self.link_local_addresses.append(link_local_addr.split("%")[0]) self.adopted_interfaces[ifname] = link_local_addr.split("%")[0] self.multicast_echoes[ifname] = time.time() RNS.log(str(self)+" Selecting link-local address "+str(link_local_addr)+" for interface "+str(ifname), RNS.LOG_EXTREME) if link_local_addr == None: RNS.log(str(self)+" No link-local IPv6 address configured for "+str(ifname)+", skipping interface", RNS.LOG_EXTREME) else: mcast_addr = self.mcast_discovery_address RNS.log(str(self)+" Creating multicast discovery listener on "+str(ifname)+" with address "+str(mcast_addr), RNS.LOG_EXTREME) # Struct with interface index if_struct = struct.pack("I", socket.if_nametoindex(ifname)) # Set up multicast socket discovery_socket = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) discovery_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) if hasattr(socket, "SO_REUSEPORT"): discovery_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) discovery_socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF, if_struct) # Join multicast group mcast_group = socket.inet_pton(socket.AF_INET6, mcast_addr) + if_struct discovery_socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mcast_group) # Bind socket addr_info = socket.getaddrinfo(mcast_addr+"%"+ifname, self.discovery_port, socket.AF_INET6, socket.SOCK_DGRAM) discovery_socket.bind(addr_info[0][4]) # Set up thread for discovery packets def discovery_loop(): self.discovery_handler(discovery_socket, ifname) thread = threading.Thread(target=discovery_loop) thread.daemon = True thread.start() suitable_interfaces += 1 if suitable_interfaces == 0: RNS.log(str(self)+" could not autoconfigure. This interface currently provides no connectivity.", RNS.LOG_WARNING) else: self.receives = True peering_wait = self.announce_interval*1.2 RNS.log(str(self)+" discovering peers for "+str(round(peering_wait, 2))+" seconds...", RNS.LOG_VERBOSE) def handlerFactory(callback): def createHandler(*args, **keys): return AutoInterfaceHandler(callback, *args, **keys) return createHandler self.owner = owner socketserver.UDPServer.address_family = socket.AF_INET6 for ifname in self.adopted_interfaces: local_addr = self.adopted_interfaces[ifname]+"%"+ifname addr_info = socket.getaddrinfo(local_addr, self.data_port, socket.AF_INET6, socket.SOCK_DGRAM) address = addr_info[0][4] self.server = socketserver.UDPServer(address, handlerFactory(self.processIncoming)) thread = threading.Thread(target=self.server.serve_forever) thread.daemon = True thread.start() job_thread = threading.Thread(target=self.peer_jobs) job_thread.daemon = True job_thread.start() time.sleep(peering_wait) if configured_bitrate != None: self.bitrate = configured_bitrate else: self.bitrate = AutoInterface.BITRATE_GUESS self.online = True def discovery_handler(self, socket, ifname): def announce_loop(): self.announce_handler(ifname) thread = threading.Thread(target=announce_loop) thread.daemon = True thread.start() while True: data, ipv6_src = socket.recvfrom(1024) expected_hash = RNS.Identity.full_hash(self.group_id+ipv6_src[0].encode("utf-8")) if data == expected_hash: self.add_peer(ipv6_src[0], ifname) else: RNS.log(str(self)+" received peering packet on "+str(ifname)+" from "+str(ipv6_src[0])+", but authentication hash was incorrect.", RNS.LOG_DEBUG) def peer_jobs(self): while True: time.sleep(self.peer_job_interval) now = time.time() timed_out_peers = [] # Check for timed out peers for peer_addr in self.peers: peer = self.peers[peer_addr] last_heard = peer[1] if now > last_heard+self.peering_timeout: timed_out_peers.append(peer_addr) # Remove any timed out peers for peer_addr in timed_out_peers: removed_peer = self.peers.pop(peer_addr) RNS.log(str(self)+" removed peer "+str(peer_addr)+" on "+str(removed_peer[0]), RNS.LOG_DEBUG) for ifname in self.adopted_interfaces: last_multicast_echo = 0 if ifname in self.multicast_echoes: last_multicast_echo = self.multicast_echoes[ifname] if now - last_multicast_echo > self.multicast_echo_timeout: if ifname in self.timed_out_interfaces and self.timed_out_interfaces[ifname] == False: RNS.log("Multicast echo timeout for "+str(ifname)+". Carrier lost.", RNS.LOG_WARNING) self.timed_out_interfaces[ifname] = True else: if ifname in self.timed_out_interfaces and self.timed_out_interfaces[ifname] == True: RNS.log(str(self)+" Carrier recovered on "+str(ifname), RNS.LOG_WARNING) self.timed_out_interfaces[ifname] = False def announce_handler(self, ifname): while True: self.peer_announce(ifname) time.sleep(self.announce_interval) def peer_announce(self, ifname): try: link_local_address = self.adopted_interfaces[ifname] discovery_token = RNS.Identity.full_hash(self.group_id+link_local_address.encode("utf-8")) announce_socket = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) addr_info = socket.getaddrinfo(self.mcast_discovery_address, self.discovery_port, socket.AF_INET6, socket.SOCK_DGRAM) ifis = struct.pack("I", socket.if_nametoindex(ifname)) announce_socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF, ifis) announce_socket.sendto(discovery_token, addr_info[0][4]) announce_socket.close() except Exception as e: if (ifname in self.timed_out_interfaces and self.timed_out_interfaces[ifname] == False) or not ifname in self.timed_out_interfaces: RNS.log(str(self)+" Detected possible carrier loss on "+str(ifname)+": "+str(e), RNS.LOG_WARNING) else: pass def add_peer(self, addr, ifname): if addr in self.link_local_addresses: ifname = None for interface_name in self.adopted_interfaces: if self.adopted_interfaces[interface_name] == addr: ifname = interface_name if ifname != None: self.multicast_echoes[ifname] = time.time() else: RNS.log(str(self)+" received multicast echo on unexpected interface "+str(ifname), RNS.LOG_WARNING) else: if not addr in self.peers: self.peers[addr] = [ifname, time.time()] RNS.log(str(self)+" added peer "+str(addr)+" on "+str(ifname), RNS.LOG_DEBUG) else: self.refresh_peer(addr) def refresh_peer(self, addr): self.peers[addr][1] = time.time() def processIncoming(self, data): self.rxb += len(data) self.owner.inbound(data, self) def processOutgoing(self,data): for peer in self.peers: try: if self.outbound_udp_socket == None: self.outbound_udp_socket = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) peer_addr = str(peer)+"%"+str(self.peers[peer][0]) addr_info = socket.getaddrinfo(peer_addr, self.data_port, socket.AF_INET6, socket.SOCK_DGRAM) self.outbound_udp_socket.sendto(data, addr_info[0][4]) except Exception as e: RNS.log("Could not transmit on "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR) self.txb += len(data) def __str__(self): return "AutoInterface["+self.name+"]" class AutoInterfaceHandler(socketserver.BaseRequestHandler): def __init__(self, callback, *args, **keys): self.callback = callback socketserver.BaseRequestHandler.__init__(self, *args, **keys) def handle(self): data = self.request[0] self.callback(data)