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