Reticulum/RNS/Interfaces/AutoInterface.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 re
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"
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SCOPE_GLOBAL = "e"
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PEERING_TIMEOUT = 7.5
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DARWIN_IGNORE_IFS = ["awdl0", "llw0", "lo0", "en5"]
ANDROID_IGNORE_IFS = ["dummy0", "lo", "tun0"]
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BITRATE_GUESS = 10*1000*1000
def handler_factory(self, callback):
def create_handler(*args, **keys):
return AutoInterfaceHandler(callback, *args, **keys)
return create_handler
def descope_linklocal(self, link_local_addr):
# Drop scope specifier expressd as %ifname (macOS)
link_local_addr = link_local_addr.split("%")[0]
# Drop embedded scope specifier (NetBSD, OpenBSD)
link_local_addr = re.sub(r"fe80:[0-9a-f]*::","fe80::", link_local_addr)
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):
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 = {}
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self.link_local_addresses = []
self.adopted_interfaces = {}
self.interface_servers = {}
self.multicast_echoes = {}
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self.timed_out_interfaces = {}
self.carrier_changed = False
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:
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
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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:
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RNS.log(str(self)+" skipping Darwin AWDL or tethering interface "+str(ifname), RNS.LOG_EXTREME)
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)
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)
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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)
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:
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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 = self.descope_linklocal(address["addr"])
self.link_local_addresses.append(link_local_addr)
self.adopted_interfaces[ifname] = link_local_addr
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)
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)
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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)
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# 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
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thread.start()
suitable_interfaces += 1
if suitable_interfaces == 0:
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RNS.log(str(self)+" could not autoconfigure. This interface currently provides no connectivity.", RNS.LOG_WARNING)
else:
self.receives = True
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peering_wait = self.announce_interval*1.2
RNS.log(str(self)+" discovering peers for "+str(round(peering_wait, 2))+" seconds...", RNS.LOG_VERBOSE)
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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]
udp_server = socketserver.UDPServer(address, self.handler_factory(self.processIncoming))
self.interface_servers[ifname] = udp_server
thread = threading.Thread(target=udp_server.serve_forever)
thread.daemon = True
thread.start()
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job_thread = threading.Thread(target=self.peer_jobs)
job_thread.daemon = True
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job_thread.start()
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time.sleep(peering_wait)
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if configured_bitrate != None:
self.bitrate = configured_bitrate
else:
self.bitrate = AutoInterface.BITRATE_GUESS
self.online = True
def discovery_handler(self, socket, ifname):
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def announce_loop():
self.announce_handler(ifname)
thread = threading.Thread(target=announce_loop)
thread.daemon = True
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thread.start()
while True:
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"))
if data == expected_hash:
self.add_peer(ipv6_src[0], ifname)
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else:
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):
while True:
time.sleep(self.peer_job_interval)
now = time.time()
timed_out_peers = []
# Check for timed out peers
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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
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for peer_addr in timed_out_peers:
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removed_peer = self.peers.pop(peer_addr)
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:
# Check that the link-local address has not changed
try:
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 = self.descope_linklocal(address["addr"])
if link_local_addr != self.adopted_interfaces[ifname]:
old_link_local_address = self.adopted_interfaces[ifname]
RNS.log("Replacing link-local address "+str(old_link_local_address)+" for "+str(ifname)+" with "+str(link_local_addr), RNS.LOG_DEBUG)
self.adopted_interfaces[ifname] = link_local_addr
self.link_local_addresses.append(link_local_addr)
if old_link_local_address in self.link_local_addresses:
self.link_local_addresses.remove(old_link_local_address)
local_addr = link_local_addr+"%"+ifname
addr_info = socket.getaddrinfo(local_addr, self.data_port, socket.AF_INET6, socket.SOCK_DGRAM)
listen_address = addr_info[0][4]
if ifname in self.interface_servers:
RNS.log("Shutting down previous UDP listener for "+str(self)+" "+str(ifname), RNS.LOG_DEBUG)
previous_server = self.interface_servers[ifname]
def shutdown_server():
previous_server.shutdown()
threading.Thread(target=shutdown_server, daemon=True).start()
RNS.log("Starting new UDP listener for "+str(self)+" "+str(ifname), RNS.LOG_DEBUG)
udp_server = socketserver.UDPServer(listen_address, self.handler_factory(self.processIncoming))
self.interface_servers[ifname] = udp_server
thread = threading.Thread(target=udp_server.serve_forever)
thread.daemon = True
thread.start()
except Exception as e:
RNS.log("Could not get device information while updating link-local addresses for "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
# Check multicast echo timeouts
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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:
self.carrier_changed = True
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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:
self.carrier_changed = True
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RNS.log(str(self)+" Carrier recovered on "+str(ifname), RNS.LOG_WARNING)
self.timed_out_interfaces[ifname] = False
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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])
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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:
RNS.log(str(self)+" Detected possible carrier loss on "+str(ifname)+": "+str(e), RNS.LOG_WARNING)
else:
pass
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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:
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RNS.log(str(self)+" received multicast echo on unexpected interface "+str(ifname), RNS.LOG_WARNING)
else:
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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)
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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])
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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]
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self.callback(data)