1575 lines
82 KiB
Python
Executable File
1575 lines
82 KiB
Python
Executable File
import os
|
|
import RNS
|
|
import time
|
|
import math
|
|
import struct
|
|
import threading
|
|
import traceback
|
|
from time import sleep
|
|
from .vendor import umsgpack as umsgpack
|
|
|
|
class Transport:
|
|
"""
|
|
Through static methods of this class you can interact with the
|
|
Transport system of Reticulum.
|
|
"""
|
|
# Constants
|
|
BROADCAST = 0x00;
|
|
TRANSPORT = 0x01;
|
|
RELAY = 0x02;
|
|
TUNNEL = 0x03;
|
|
types = [BROADCAST, TRANSPORT, RELAY, TUNNEL]
|
|
|
|
REACHABILITY_UNREACHABLE = 0x00
|
|
REACHABILITY_DIRECT = 0x01
|
|
REACHABILITY_TRANSPORT = 0x02
|
|
|
|
APP_NAME = "rnstransport"
|
|
|
|
PATHFINDER_M = 128 # Max hops
|
|
"""
|
|
Maximum amount of hops that Reticulum will transport a packet.
|
|
"""
|
|
PATHFINDER_C = 2.0 # Decay constant
|
|
PATHFINDER_R = 1 # Retransmit retries
|
|
PATHFINDER_T = 10 # Retry grace period
|
|
PATHFINDER_RW = 10 # Random window for announce rebroadcast
|
|
PATHFINDER_E = 60*60*24*7 # Path expiration in seconds
|
|
|
|
# TODO: Calculate an optimal number for this in
|
|
# various situations
|
|
LOCAL_REBROADCASTS_MAX = 2 # How many local rebroadcasts of an announce is allowed
|
|
|
|
PATH_REQUEST_GRACE = 0.35 # Grace time before a path announcement is made, allows directly reachable peers to respond first
|
|
PATH_REQUEST_RW = 2 # Path request random window
|
|
|
|
LINK_TIMEOUT = RNS.Link.KEEPALIVE * 2
|
|
REVERSE_TIMEOUT = 30*60 # Reverse table entries are removed after max 30 minutes
|
|
DESTINATION_TIMEOUT = PATHFINDER_E # Destination table entries are removed if unused for one week
|
|
MAX_RECEIPTS = 1024 # Maximum number of receipts to keep track of
|
|
|
|
interfaces = [] # All active interfaces
|
|
destinations = [] # All active destinations
|
|
pending_links = [] # Links that are being established
|
|
active_links = [] # Links that are active
|
|
packet_hashlist = [] # A list of packet hashes for duplicate detection
|
|
receipts = [] # Receipts of all outgoing packets for proof processing
|
|
|
|
# TODO: "destination_table" should really be renamed to "path_table"
|
|
# Notes on memory usage: 1 megabyte of memory can store approximately
|
|
# 55.100 path table entries or approximately 22.300 link table entries.
|
|
announce_table = {} # A table for storing announces currently waiting to be retransmitted
|
|
destination_table = {} # A lookup table containing the next hop to a given destination
|
|
reverse_table = {} # A lookup table for storing packet hashes used to return proofs and replies
|
|
link_table = {} # A lookup table containing hops for links
|
|
held_announces = {} # A table containing temporarily held announce-table entries
|
|
announce_handlers = [] # A table storing externally registered announce handlers
|
|
tunnels = {} # A table storing tunnels to other transport instances
|
|
|
|
# Transport control destinations are used
|
|
# for control purposes like path requests
|
|
control_destinations = []
|
|
control_hashes = []
|
|
|
|
# Interfaces for communicating with
|
|
# local clients connected to a shared
|
|
# Reticulum instance
|
|
local_client_interfaces = []
|
|
|
|
jobs_locked = False
|
|
jobs_running = False
|
|
job_interval = 0.250
|
|
receipts_last_checked = 0.0
|
|
receipts_check_interval = 1.0
|
|
announces_last_checked = 0.0
|
|
announces_check_interval = 1.0
|
|
hashlist_maxsize = 1000000
|
|
tables_last_culled = 0.0
|
|
tables_cull_interval = 5.0
|
|
|
|
identity = None
|
|
|
|
@staticmethod
|
|
def start(reticulum_instance):
|
|
Transport.owner = reticulum_instance
|
|
|
|
if Transport.identity == None:
|
|
transport_identity_path = RNS.Reticulum.storagepath+"/transport_identity"
|
|
if os.path.isfile(transport_identity_path):
|
|
Transport.identity = RNS.Identity.from_file(transport_identity_path)
|
|
|
|
if Transport.identity == None:
|
|
RNS.log("No valid Transport Identity in storage, creating...", RNS.LOG_VERBOSE)
|
|
Transport.identity = RNS.Identity()
|
|
Transport.identity.to_file(transport_identity_path)
|
|
else:
|
|
RNS.log("Loaded Transport Identity from storage", RNS.LOG_VERBOSE)
|
|
|
|
packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
|
|
if os.path.isfile(packet_hashlist_path):
|
|
try:
|
|
file = open(packet_hashlist_path, "rb")
|
|
Transport.packet_hashlist = umsgpack.unpackb(file.read())
|
|
file.close()
|
|
except Exception as e:
|
|
RNS.log("Could not load packet hashlist from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
# Create transport-specific destinations
|
|
Transport.path_request_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
|
|
Transport.path_request_destination.set_packet_callback(Transport.path_request_handler)
|
|
Transport.control_destinations.append(Transport.path_request_destination)
|
|
Transport.control_hashes.append(Transport.path_request_destination.hash)
|
|
|
|
Transport.tunnel_synthesize_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "tunnel", "synthesize")
|
|
Transport.tunnel_synthesize_destination.set_packet_callback(Transport.tunnel_synthesize_handler)
|
|
Transport.control_destinations.append(Transport.tunnel_synthesize_handler)
|
|
Transport.control_hashes.append(Transport.tunnel_synthesize_destination.hash)
|
|
|
|
thread = threading.Thread(target=Transport.jobloop)
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
|
|
if RNS.Reticulum.transport_enabled():
|
|
destination_table_path = RNS.Reticulum.storagepath+"/destination_table"
|
|
tunnel_table_path = RNS.Reticulum.storagepath+"/tunnels"
|
|
|
|
if os.path.isfile(destination_table_path) and not Transport.owner.is_connected_to_shared_instance:
|
|
serialised_destinations = []
|
|
try:
|
|
file = open(destination_table_path, "rb")
|
|
serialised_destinations = umsgpack.unpackb(file.read())
|
|
file.close()
|
|
|
|
for serialised_entry in serialised_destinations:
|
|
destination_hash = serialised_entry[0]
|
|
timestamp = serialised_entry[1]
|
|
received_from = serialised_entry[2]
|
|
hops = serialised_entry[3]
|
|
expires = serialised_entry[4]
|
|
random_blobs = serialised_entry[5]
|
|
receiving_interface = Transport.find_interface_from_hash(serialised_entry[6])
|
|
announce_packet = Transport.get_cached_packet(serialised_entry[7])
|
|
|
|
if announce_packet != None and receiving_interface != None:
|
|
announce_packet.unpack()
|
|
# We increase the hops, since reading a packet
|
|
# from cache is equivalent to receiving it again
|
|
# over an interface. It is cached with it's non-
|
|
# increased hop-count.
|
|
announce_packet.hops += 1
|
|
Transport.destination_table[destination_hash] = [timestamp, received_from, hops, expires, random_blobs, receiving_interface, announce_packet]
|
|
RNS.log("Loaded path table entry for "+RNS.prettyhexrep(destination_hash)+" from storage", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Could not reconstruct path table entry from storage for "+RNS.prettyhexrep(destination_hash), RNS.LOG_DEBUG)
|
|
if announce_packet == None:
|
|
RNS.log("The announce packet could not be loaded from cache", RNS.LOG_DEBUG)
|
|
if receiving_interface == None:
|
|
RNS.log("The interface is no longer available", RNS.LOG_DEBUG)
|
|
|
|
if len(Transport.destination_table) == 1:
|
|
specifier = "entry"
|
|
else:
|
|
specifier = "entries"
|
|
|
|
RNS.log("Loaded "+str(len(Transport.destination_table))+" path table "+specifier+" from storage", RNS.LOG_VERBOSE)
|
|
|
|
except Exception as e:
|
|
RNS.log("Could not load destination table from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
if os.path.isfile(tunnel_table_path) and not Transport.owner.is_connected_to_shared_instance:
|
|
serialised_tunnels = []
|
|
try:
|
|
file = open(tunnel_table_path, "rb")
|
|
serialised_tunnels = umsgpack.unpackb(file.read())
|
|
file.close()
|
|
|
|
for serialised_tunnel in serialised_tunnels:
|
|
tunnel_id = serialised_tunnel[0]
|
|
interface_hash = serialised_tunnel[1]
|
|
serialised_paths = serialised_tunnel[2]
|
|
expires = serialised_tunnel[3]
|
|
|
|
tunnel_paths = {}
|
|
for serialised_entry in serialised_paths:
|
|
destination_hash = serialised_entry[0]
|
|
timestamp = serialised_entry[1]
|
|
received_from = serialised_entry[2]
|
|
hops = serialised_entry[3]
|
|
expires = serialised_entry[4]
|
|
random_blobs = serialised_entry[5]
|
|
receiving_interface = Transport.find_interface_from_hash(serialised_entry[6])
|
|
announce_packet = Transport.get_cached_packet(serialised_entry[7])
|
|
|
|
if announce_packet != None:
|
|
announce_packet.unpack()
|
|
# We increase the hops, since reading a packet
|
|
# from cache is equivalent to receiving it again
|
|
# over an interface. It is cached with it's non-
|
|
# increased hop-count.
|
|
announce_packet.hops += 1
|
|
|
|
tunnel_path = [timestamp, received_from, hops, expires, random_blobs, receiving_interface, announce_packet]
|
|
tunnel_paths[destination_hash] = tunnel_path
|
|
|
|
tunnel = [tunnel_id, None, tunnel_paths, expires]
|
|
Transport.tunnels[tunnel_id] = tunnel
|
|
|
|
if len(Transport.destination_table) == 1:
|
|
specifier = "entry"
|
|
else:
|
|
specifier = "entries"
|
|
|
|
RNS.log("Loaded "+str(len(Transport.tunnels))+" tunnel table "+specifier+" from storage", RNS.LOG_VERBOSE)
|
|
|
|
except Exception as e:
|
|
RNS.log("Could not load tunnel table from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
|
|
|
|
RNS.log("Transport instance "+str(Transport.identity)+" started", RNS.LOG_VERBOSE)
|
|
|
|
# Synthesize tunnels for any interfaces wanting it
|
|
for interface in Transport.interfaces:
|
|
interface.tunnel_id = None
|
|
if hasattr(interface, "wants_tunnel") and interface.wants_tunnel:
|
|
Transport.synthesize_tunnel(interface)
|
|
|
|
@staticmethod
|
|
def jobloop():
|
|
while (True):
|
|
Transport.jobs()
|
|
sleep(Transport.job_interval)
|
|
|
|
@staticmethod
|
|
def jobs():
|
|
outgoing = []
|
|
Transport.jobs_running = True
|
|
try:
|
|
if not Transport.jobs_locked:
|
|
# Process receipts list for timed-out packets
|
|
if time.time() > Transport.receipts_last_checked+Transport.receipts_check_interval:
|
|
while len(Transport.receipts) > Transport.MAX_RECEIPTS:
|
|
culled_receipt = Transport.receipts.pop(0)
|
|
culled_receipt.timeout = -1
|
|
culled_receipt.check_timeout()
|
|
|
|
for receipt in Transport.receipts:
|
|
receipt.check_timeout()
|
|
if receipt.status != RNS.PacketReceipt.SENT:
|
|
Transport.receipts.remove(receipt)
|
|
|
|
Transport.receipts_last_checked = time.time()
|
|
|
|
# Process announces needing retransmission
|
|
if time.time() > Transport.announces_last_checked+Transport.announces_check_interval:
|
|
for destination_hash in Transport.announce_table:
|
|
announce_entry = Transport.announce_table[destination_hash]
|
|
if announce_entry[2] > Transport.PATHFINDER_R:
|
|
RNS.log("Dropping announce for "+RNS.prettyhexrep(destination_hash)+", retries exceeded", RNS.LOG_DEBUG)
|
|
Transport.announce_table.pop(destination_hash)
|
|
break
|
|
else:
|
|
if time.time() > announce_entry[1]:
|
|
announce_entry[1] = time.time() + math.pow(Transport.PATHFINDER_C, announce_entry[4]) + Transport.PATHFINDER_T + Transport.PATHFINDER_RW
|
|
announce_entry[2] += 1
|
|
packet = announce_entry[5]
|
|
block_rebroadcasts = announce_entry[7]
|
|
attached_interface = announce_entry[8]
|
|
announce_context = RNS.Packet.NONE
|
|
if block_rebroadcasts:
|
|
announce_context = RNS.Packet.PATH_RESPONSE
|
|
announce_data = packet.data
|
|
announce_identity = RNS.Identity.recall(packet.destination_hash)
|
|
announce_destination = RNS.Destination(announce_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "unknown", "unknown");
|
|
announce_destination.hash = packet.destination_hash
|
|
announce_destination.hexhash = announce_destination.hash.hex()
|
|
|
|
new_packet = RNS.Packet(
|
|
announce_destination,
|
|
announce_data,
|
|
RNS.Packet.ANNOUNCE,
|
|
context = announce_context,
|
|
header_type = RNS.Packet.HEADER_2,
|
|
transport_type = Transport.TRANSPORT,
|
|
transport_id = Transport.identity.hash,
|
|
attached_interface = attached_interface
|
|
)
|
|
|
|
new_packet.hops = announce_entry[4]
|
|
if block_rebroadcasts:
|
|
RNS.log("Rebroadcasting announce as path response for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
|
|
outgoing.append(new_packet)
|
|
|
|
# This handles an edge case where a peer sends a past
|
|
# request for a destination just after an announce for
|
|
# said destination has arrived, but before it has been
|
|
# rebroadcast locally. In such a case the actual announce
|
|
# is temporarily held, and then reinserted when the path
|
|
# request has been served to the peer.
|
|
if destination_hash in Transport.held_announces:
|
|
held_entry = Transport.held_announces.pop(destination_hash)
|
|
Transport.announce_table[destination_hash] = held_entry
|
|
RNS.log("Reinserting held announce into table", RNS.LOG_DEBUG)
|
|
|
|
Transport.announces_last_checked = time.time()
|
|
|
|
|
|
# Cull the packet hashlist if it has reached max size
|
|
if len(Transport.packet_hashlist) > Transport.hashlist_maxsize:
|
|
Transport.packet_hashlist = Transport.packet_hashlist[len(Transport.packet_hashlist)-Transport.hashlist_maxsize:len(Transport.packet_hashlist)-1]
|
|
|
|
if time.time() > Transport.tables_last_culled + Transport.tables_cull_interval:
|
|
# Cull the reverse table according to timeout
|
|
stale_reverse_entries = []
|
|
for truncated_packet_hash in Transport.reverse_table:
|
|
reverse_entry = Transport.reverse_table[truncated_packet_hash]
|
|
if time.time() > reverse_entry[2] + Transport.REVERSE_TIMEOUT:
|
|
stale_reverse_entries.append(truncated_packet_hash)
|
|
|
|
# Cull the link table according to timeout
|
|
stale_links = []
|
|
for link_id in Transport.link_table:
|
|
link_entry = Transport.link_table[link_id]
|
|
if time.time() > link_entry[0] + Transport.LINK_TIMEOUT:
|
|
stale_links.append(link_id)
|
|
|
|
# Cull the path table
|
|
stale_paths = []
|
|
for destination_hash in Transport.destination_table:
|
|
destination_entry = Transport.destination_table[destination_hash]
|
|
attached_interface = destination_entry[5]
|
|
|
|
if time.time() > destination_entry[0] + Transport.DESTINATION_TIMEOUT:
|
|
stale_paths.append(destination_hash)
|
|
RNS.log("Path to "+RNS.prettyhexrep(destination_hash)+" timed out and was removed", RNS.LOG_DEBUG)
|
|
elif not attached_interface in Transport.interfaces:
|
|
stale_paths.append(destination_hash)
|
|
RNS.log("Path to "+RNS.prettyhexrep(destination_hash)+" was removed since the attached interface no longer exists", RNS.LOG_DEBUG)
|
|
|
|
# Cull the tunnel table
|
|
stale_tunnels = []
|
|
ti = 0
|
|
for tunnel_id in Transport.tunnels:
|
|
tunnel_entry = Transport.tunnels[tunnel_id]
|
|
|
|
expires = tunnel_entry[3]
|
|
if time.time() > expires:
|
|
stale_tunnels.append(tunnel_id)
|
|
RNS.log("Tunnel "+RNS.prettyhexrep(tunnel_id)+" timed out and was removed", RNS.LOG_DEBUG)
|
|
else:
|
|
stale_tunnel_paths = []
|
|
tunnel_paths = tunnel_entry[2]
|
|
for tunnel_path in tunnel_paths:
|
|
tunnel_path_entry = tunnel_paths[tunnel_path]
|
|
|
|
if time.time() > tunnel_path_entry[0] + Transport.DESTINATION_TIMEOUT:
|
|
stale_tunnel_paths.append(tunnel_path)
|
|
RNS.log("Tunnel path to "+RNS.prettyhexrep(tunnel_path)+" timed out and was removed", RNS.LOG_DEBUG)
|
|
|
|
for tunnel_path in stale_tunnel_paths:
|
|
tunnel_paths.pop(tunnel_path)
|
|
ti += 1
|
|
|
|
|
|
if ti > 0:
|
|
if ti == 1:
|
|
RNS.log("Removed "+str(ti)+" tunnel path", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Removed "+str(ti)+" tunnel paths", RNS.LOG_DEBUG)
|
|
|
|
|
|
|
|
i = 0
|
|
for truncated_packet_hash in stale_reverse_entries:
|
|
Transport.reverse_table.pop(truncated_packet_hash)
|
|
i += 1
|
|
|
|
if i > 0:
|
|
if i == 1:
|
|
RNS.log("Dropped "+str(i)+" reverse table entry", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Dropped "+str(i)+" reverse table entries", RNS.LOG_DEBUG)
|
|
|
|
|
|
|
|
i = 0
|
|
for link_id in stale_links:
|
|
Transport.link_table.pop(link_id)
|
|
i += 1
|
|
|
|
if i > 0:
|
|
if i == 1:
|
|
RNS.log("Dropped "+str(i)+" link", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Dropped "+str(i)+" links", RNS.LOG_DEBUG)
|
|
|
|
i = 0
|
|
for destination_hash in stale_paths:
|
|
Transport.destination_table.pop(destination_hash)
|
|
i += 1
|
|
|
|
if i > 0:
|
|
if i == 1:
|
|
RNS.log("Removed "+str(i)+" path", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Removed "+str(i)+" paths", RNS.LOG_DEBUG)
|
|
|
|
i = 0
|
|
for tunnel_id in stale_tunnels:
|
|
Transport.tunnels.pop(tunnel_id)
|
|
i += 1
|
|
|
|
if i > 0:
|
|
if i == 1:
|
|
RNS.log("Removed "+str(i)+" tunnel", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Removed "+str(i)+" tunnels", RNS.LOG_DEBUG)
|
|
|
|
Transport.tables_last_culled = time.time()
|
|
|
|
except Exception as e:
|
|
RNS.log("An exception occurred while running Transport jobs.", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
traceback.print_exc()
|
|
|
|
Transport.jobs_running = False
|
|
|
|
for packet in outgoing:
|
|
packet.send()
|
|
|
|
@staticmethod
|
|
def outbound(packet):
|
|
while (Transport.jobs_running):
|
|
sleep(0.01)
|
|
|
|
Transport.jobs_locked = True
|
|
# TODO: This updateHash call might be redundant
|
|
packet.update_hash()
|
|
sent = False
|
|
|
|
# Check if we have a known path for the destination in the path table
|
|
if packet.packet_type != RNS.Packet.ANNOUNCE and packet.destination_hash in Transport.destination_table:
|
|
outbound_interface = Transport.destination_table[packet.destination_hash][5]
|
|
|
|
# If there's more than one hop to the destination, and we know
|
|
# a path, we insert the packet into transport by adding the next
|
|
# transport nodes address to the header, and modifying the flags.
|
|
# This rule applies both for "normal" transport, and when connected
|
|
# to a local shared Reticulum instance.
|
|
if Transport.destination_table[packet.destination_hash][2] > 1:
|
|
if packet.header_type == RNS.Packet.HEADER_1:
|
|
# Insert packet into transport
|
|
new_flags = (RNS.Packet.HEADER_2) << 6 | (Transport.TRANSPORT) << 4 | (packet.flags & 0b00001111)
|
|
new_raw = struct.pack("!B", new_flags)
|
|
new_raw += packet.raw[1:2]
|
|
new_raw += Transport.destination_table[packet.destination_hash][1]
|
|
new_raw += packet.raw[2:]
|
|
outbound_interface.processOutgoing(new_raw)
|
|
Transport.destination_table[packet.destination_hash][0] = time.time()
|
|
sent = True
|
|
|
|
# In the special case where we are connected to a local shared
|
|
# Reticulum instance, and the destination is one hop away, we
|
|
# also add transport headers to inject the packet into transport
|
|
# via the shared instance. Normally a packet for a destination
|
|
# one hop away would just be broadcast directly, but since we
|
|
# are "behind" a shared instance, we need to get that instance
|
|
# to transport it onto the network.
|
|
elif Transport.destination_table[packet.destination_hash][2] == 1 and Transport.owner.is_connected_to_shared_instance:
|
|
if packet.header_type == RNS.Packet.HEADER_1:
|
|
# Insert packet into transport
|
|
new_flags = (RNS.Packet.HEADER_2) << 6 | (Transport.TRANSPORT) << 4 | (packet.flags & 0b00001111)
|
|
new_raw = struct.pack("!B", new_flags)
|
|
new_raw += packet.raw[1:2]
|
|
new_raw += Transport.destination_table[packet.destination_hash][1]
|
|
new_raw += packet.raw[2:]
|
|
outbound_interface.processOutgoing(new_raw)
|
|
Transport.destination_table[packet.destination_hash][0] = time.time()
|
|
sent = True
|
|
|
|
# If none of the above applies, we know the destination is
|
|
# directly reachable, and also on which interface, so we
|
|
# simply transmit the packet directly on that one.
|
|
else:
|
|
outbound_interface.processOutgoing(packet.raw)
|
|
sent = True
|
|
|
|
# If we don't have a known path for the destination, we'll
|
|
# broadcast the packet on all outgoing interfaces, or the
|
|
# just the relevant interface if the packet has an attached
|
|
# interface, or belongs to a link.
|
|
else:
|
|
stored_hash = False
|
|
for interface in Transport.interfaces:
|
|
if interface.OUT:
|
|
should_transmit = True
|
|
if packet.destination.type == RNS.Destination.LINK:
|
|
if packet.destination.status == RNS.Link.CLOSED:
|
|
should_transmit = False
|
|
if interface != packet.destination.attached_interface:
|
|
should_transmit = False
|
|
if packet.attached_interface != None and interface != packet.attached_interface:
|
|
should_transmit = False
|
|
|
|
if should_transmit:
|
|
if not stored_hash:
|
|
Transport.packet_hashlist.append(packet.packet_hash)
|
|
stored_hash = True
|
|
|
|
interface.processOutgoing(packet.raw)
|
|
sent = True
|
|
|
|
if sent:
|
|
packet.sent = True
|
|
packet.sent_at = time.time()
|
|
|
|
# Don't generate receipt if it has been explicitly disabled
|
|
if (packet.create_receipt == True and
|
|
# Only generate receipts for DATA packets
|
|
packet.packet_type == RNS.Packet.DATA and
|
|
# Don't generate receipts for PLAIN destinations
|
|
packet.destination.type != RNS.Destination.PLAIN and
|
|
# Don't generate receipts for link-related packets
|
|
not (packet.context >= RNS.Packet.KEEPALIVE and packet.context <= RNS.Packet.LRPROOF) and
|
|
# Don't generate receipts for resource packets
|
|
not (packet.context >= RNS.Packet.RESOURCE and packet.context <= RNS.Packet.RESOURCE_RCL)):
|
|
|
|
packet.receipt = RNS.PacketReceipt(packet)
|
|
Transport.receipts.append(packet.receipt)
|
|
|
|
Transport.cache(packet)
|
|
|
|
Transport.jobs_locked = False
|
|
return sent
|
|
|
|
@staticmethod
|
|
def packet_filter(packet):
|
|
# TODO: Think long and hard about this.
|
|
# Is it even strictly necessary with the current
|
|
# transport rules?
|
|
if packet.context == RNS.Packet.KEEPALIVE:
|
|
return True
|
|
if packet.context == RNS.Packet.RESOURCE_REQ:
|
|
return True
|
|
if packet.context == RNS.Packet.RESOURCE_PRF:
|
|
return True
|
|
if packet.context == RNS.Packet.RESOURCE:
|
|
return True
|
|
if packet.context == RNS.Packet.CACHE_REQUEST:
|
|
return True
|
|
if packet.destination_type == RNS.Destination.PLAIN:
|
|
return True
|
|
|
|
if not packet.packet_hash in Transport.packet_hashlist:
|
|
return True
|
|
else:
|
|
if packet.packet_type == RNS.Packet.ANNOUNCE:
|
|
return True
|
|
|
|
RNS.log("Filtered packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
|
|
return False
|
|
|
|
@staticmethod
|
|
def inbound(raw, interface=None):
|
|
while (Transport.jobs_running):
|
|
sleep(0.01)
|
|
|
|
Transport.jobs_locked = True
|
|
|
|
packet = RNS.Packet(None, raw)
|
|
packet.unpack()
|
|
packet.receiving_interface = interface
|
|
packet.hops += 1
|
|
|
|
if len(Transport.local_client_interfaces) > 0:
|
|
|
|
if Transport.is_local_client_interface(interface):
|
|
packet.hops -= 1
|
|
elif Transport.interface_to_shared_instance(interface):
|
|
packet.hops -= 1
|
|
|
|
|
|
if Transport.packet_filter(packet):
|
|
Transport.packet_hashlist.append(packet.packet_hash)
|
|
Transport.cache(packet)
|
|
|
|
# Check special conditions for local clients connected
|
|
# through a shared Reticulum instance
|
|
from_local_client = (packet.receiving_interface in Transport.local_client_interfaces)
|
|
for_local_client = (packet.packet_type != RNS.Packet.ANNOUNCE) and (packet.destination_hash in Transport.destination_table and Transport.destination_table[packet.destination_hash][2] == 0)
|
|
for_local_client_link = (packet.packet_type != RNS.Packet.ANNOUNCE) and (packet.destination_hash in Transport.link_table and Transport.link_table[packet.destination_hash][4] in Transport.local_client_interfaces)
|
|
for_local_client_link |= (packet.packet_type != RNS.Packet.ANNOUNCE) and (packet.destination_hash in Transport.link_table and Transport.link_table[packet.destination_hash][2] in Transport.local_client_interfaces)
|
|
proof_for_local_client = (packet.destination_hash in Transport.reverse_table) and (Transport.reverse_table[packet.destination_hash][0] in Transport.local_client_interfaces)
|
|
|
|
# Plain broadcast packets from local clients are sent
|
|
# directly on all attached interfaces, since they are
|
|
# never injected into transport.
|
|
if not packet.destination_hash in Transport.control_hashes:
|
|
if packet.destination_type == RNS.Destination.PLAIN and packet.transport_type == Transport.BROADCAST:
|
|
# Send to all interfaces except the originator
|
|
if from_local_client:
|
|
for interface in Transport.interfaces:
|
|
if interface != packet.receiving_interface:
|
|
interface.processOutgoing(packet.raw)
|
|
# If the packet was not from a local client, send
|
|
# it directly to all local clients
|
|
else:
|
|
for interface in Transport.local_client_interfaces:
|
|
interface.processOutgoing(packet.raw)
|
|
|
|
|
|
# General transport handling. Takes care of directing
|
|
# packets according to transport tables and recording
|
|
# entries in reverse and link tables.
|
|
if RNS.Reticulum.transport_enabled() or from_local_client or for_local_client or for_local_client_link:
|
|
|
|
# If there is no transport id, but the packet is
|
|
# for a local client, we generate the transport
|
|
# id (it was stripped on the previous hop, since
|
|
# we "spoof" the hop count for clients behind a
|
|
# shared instance, so they look directly reach-
|
|
# able), and reinsert, so the normal transport
|
|
# implementation can handle the packet.
|
|
if packet.transport_id == None and for_local_client:
|
|
packet.transport_id = Transport.identity.hash
|
|
|
|
# If this is a cache request, and we can fullfill
|
|
# it, do so and stop processing. Otherwise resume
|
|
# normal processing.
|
|
if packet.context == RNS.Packet.CACHE_REQUEST:
|
|
if Transport.cache_request_packet(packet):
|
|
return
|
|
|
|
# If the packet is in transport, check whether we
|
|
# are the designated next hop, and process it
|
|
# accordingly if we are.
|
|
if packet.transport_id != None and packet.packet_type != RNS.Packet.ANNOUNCE:
|
|
if packet.transport_id == Transport.identity.hash:
|
|
if packet.destination_hash in Transport.destination_table:
|
|
next_hop = Transport.destination_table[packet.destination_hash][1]
|
|
remaining_hops = Transport.destination_table[packet.destination_hash][2]
|
|
|
|
if remaining_hops > 1:
|
|
# Just increase hop count and transmit
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += next_hop
|
|
new_raw += packet.raw[12:]
|
|
elif remaining_hops == 1:
|
|
# Strip transport headers and transmit
|
|
new_flags = (RNS.Packet.HEADER_1) << 6 | (Transport.BROADCAST) << 4 | (packet.flags & 0b00001111)
|
|
new_raw = struct.pack("!B", new_flags)
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[12:]
|
|
elif remaining_hops == 0:
|
|
# Just increase hop count and transmit
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
|
|
outbound_interface = Transport.destination_table[packet.destination_hash][5]
|
|
outbound_interface.processOutgoing(new_raw)
|
|
Transport.destination_table[packet.destination_hash][0] = time.time()
|
|
|
|
if packet.packet_type == RNS.Packet.LINKREQUEST:
|
|
# Entry format is
|
|
link_entry = [ time.time(), # 0: Timestamp,
|
|
next_hop, # 1: Next-hop transport ID
|
|
outbound_interface, # 2: Next-hop interface
|
|
remaining_hops, # 3: Remaining hops
|
|
packet.receiving_interface, # 4: Received on interface
|
|
packet.hops, # 5: Taken hops
|
|
packet.destination_hash, # 6: Original destination hash
|
|
False] # 7: Validated
|
|
|
|
Transport.link_table[packet.getTruncatedHash()] = link_entry
|
|
|
|
else:
|
|
# Entry format is
|
|
reverse_entry = [ packet.receiving_interface, # 0: Received on interface
|
|
outbound_interface, # 1: Outbound interface
|
|
time.time()] # 2: Timestamp
|
|
|
|
Transport.reverse_table[packet.getTruncatedHash()] = reverse_entry
|
|
|
|
else:
|
|
# TODO: There should probably be some kind of REJECT
|
|
# mechanism here, to signal to the source that their
|
|
# expected path failed.
|
|
RNS.log("Got packet in transport, but no known path to final destination "+RNS.prettyhexrep(packet.destination_hash)+". Dropping packet.", RNS.LOG_DEBUG)
|
|
|
|
# Link transport handling. Directs packets according
|
|
# to entries in the link tables
|
|
if packet.packet_type != RNS.Packet.ANNOUNCE and packet.packet_type != RNS.Packet.LINKREQUEST and packet.context != RNS.Packet.LRPROOF:
|
|
if packet.destination_hash in Transport.link_table:
|
|
link_entry = Transport.link_table[packet.destination_hash]
|
|
# If receiving and outbound interface is
|
|
# the same for this link, direction doesn't
|
|
# matter, and we simply send the packet on.
|
|
outbound_interface = None
|
|
if link_entry[2] == link_entry[4]:
|
|
# But check that taken hops matches one
|
|
# of the expectede values.
|
|
if packet.hops == link_entry[3] or packet.hops == link_entry[5]:
|
|
outbound_interface = link_entry[2]
|
|
else:
|
|
# If interfaces differ, we transmit on
|
|
# the opposite interface of what the
|
|
# packet was received on.
|
|
if packet.receiving_interface == link_entry[2]:
|
|
# Also check that expected hop count matches
|
|
if packet.hops == link_entry[3]:
|
|
outbound_interface = link_entry[4]
|
|
elif packet.receiving_interface == link_entry[4]:
|
|
# Also check that expected hop count matches
|
|
if packet.hops == link_entry[5]:
|
|
outbound_interface = link_entry[2]
|
|
|
|
if outbound_interface != None:
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
outbound_interface.processOutgoing(new_raw)
|
|
Transport.link_table[packet.destination_hash][0] = time.time()
|
|
else:
|
|
pass
|
|
|
|
|
|
# Announce handling. Handles logic related to incoming
|
|
# announces, queueing rebroadcasts of these, and removal
|
|
# of queued announce rebroadcasts once handed to the next node.
|
|
if packet.packet_type == RNS.Packet.ANNOUNCE:
|
|
local_destination = next((d for d in Transport.destinations if d.hash == packet.destination_hash), None)
|
|
if local_destination == None and RNS.Identity.validate_announce(packet):
|
|
if packet.transport_id != None:
|
|
received_from = packet.transport_id
|
|
|
|
# Check if this is a next retransmission from
|
|
# another node. If it is, we're removing the
|
|
# announce in question from our pending table
|
|
if RNS.Reticulum.transport_enabled() and packet.destination_hash in Transport.announce_table:
|
|
announce_entry = Transport.announce_table[packet.destination_hash]
|
|
|
|
if packet.hops-1 == announce_entry[4]:
|
|
RNS.log("Heard a local rebroadcast of announce for "+RNS.prettyhexrep(packet.destination_hash), RNS.LOG_DEBUG)
|
|
announce_entry[6] += 1
|
|
if announce_entry[6] >= Transport.LOCAL_REBROADCASTS_MAX:
|
|
RNS.log("Max local rebroadcasts of announce for "+RNS.prettyhexrep(packet.destination_hash)+" reached, dropping announce from our table", RNS.LOG_DEBUG)
|
|
Transport.announce_table.pop(packet.destination_hash)
|
|
|
|
if packet.hops-1 == announce_entry[4]+1 and announce_entry[2] > 0:
|
|
now = time.time()
|
|
if now < announce_entry[1]:
|
|
RNS.log("Rebroadcasted announce for "+RNS.prettyhexrep(packet.destination_hash)+" has been passed on to next node, no further tries needed", RNS.LOG_DEBUG)
|
|
Transport.announce_table.pop(packet.destination_hash)
|
|
|
|
else:
|
|
received_from = packet.destination_hash
|
|
|
|
# Check if this announce should be inserted into
|
|
# announce and destination tables
|
|
should_add = False
|
|
|
|
# First, check that the announce is not for a destination
|
|
# local to this system, and that hops are less than the max
|
|
if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
|
|
random_blob = packet.data[RNS.Identity.KEYSIZE//8:RNS.Identity.KEYSIZE//8+RNS.Reticulum.TRUNCATED_HASHLENGTH//8]
|
|
announce_emitted = int.from_bytes(random_blob[5:10], "big")
|
|
random_blobs = []
|
|
if packet.destination_hash in Transport.destination_table:
|
|
random_blobs = Transport.destination_table[packet.destination_hash][4]
|
|
|
|
# If we already have a path to the announced
|
|
# destination, but the hop count is equal or
|
|
# less, we'll update our tables.
|
|
if packet.hops <= Transport.destination_table[packet.destination_hash][2]:
|
|
# Make sure we haven't heard the random
|
|
# blob before, so announces can't be
|
|
# replayed to forge paths.
|
|
# TODO: Check whether this approach works
|
|
# under all circumstances
|
|
if not random_blob in random_blobs:
|
|
should_add = True
|
|
else:
|
|
should_add = False
|
|
else:
|
|
# If an announce arrives with a larger hop
|
|
# count than we already have in the table,
|
|
# ignore it, unless the path is expired, or
|
|
# the emission timestamp is more recent.
|
|
now = time.time()
|
|
path_expires = Transport.destination_table[packet.destination_hash][3]
|
|
|
|
path_announce_emitted = 0
|
|
for path_random_blob in random_blobs:
|
|
path_announce_emitted = max(path_announce_emitted, int.from_bytes(path_random_blob[5:10], "big"))
|
|
if path_announce_emitted >= announce_emitted:
|
|
break
|
|
|
|
if (now >= path_expires):
|
|
# We also check that the announce hash is
|
|
# different from ones we've already heard,
|
|
# to avoid loops in the network
|
|
if not random_blob in random_blobs:
|
|
# TODO: Check that this ^ approach actually
|
|
# works under all circumstances
|
|
RNS.log("Replacing destination table entry for "+str(RNS.prettyhexrep(packet.destination_hash))+" with new announce due to expired path", RNS.LOG_DEBUG)
|
|
should_add = True
|
|
else:
|
|
should_add = False
|
|
else:
|
|
if (announce_emitted > path_announce_emitted):
|
|
if not random_blob in random_blobs:
|
|
RNS.log("Replacing destination table entry for "+str(RNS.prettyhexrep(packet.destination_hash))+" with new announce, since it was more recently emitted", RNS.LOG_DEBUG)
|
|
should_add = True
|
|
else:
|
|
should_add = False
|
|
|
|
else:
|
|
# If this destination is unknown in our table
|
|
# we should add it
|
|
should_add = True
|
|
|
|
if should_add:
|
|
now = time.time()
|
|
retries = 0
|
|
expires = now + Transport.PATHFINDER_E
|
|
announce_hops = packet.hops
|
|
local_rebroadcasts = 0
|
|
block_rebroadcasts = False
|
|
attached_interface = None
|
|
retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW)
|
|
|
|
random_blobs.append(random_blob)
|
|
|
|
if (RNS.Reticulum.transport_enabled() or Transport.from_local_client(packet)) and packet.context != RNS.Packet.PATH_RESPONSE:
|
|
# If the announce is from a local client,
|
|
# we announce it immediately, but only one
|
|
# time.
|
|
|
|
if Transport.from_local_client(packet):
|
|
retransmit_timeout = now
|
|
retries = Transport.PATHFINDER_R
|
|
|
|
Transport.announce_table[packet.destination_hash] = [
|
|
now,
|
|
retransmit_timeout,
|
|
retries,
|
|
received_from,
|
|
announce_hops,
|
|
packet,
|
|
local_rebroadcasts,
|
|
block_rebroadcasts,
|
|
attached_interface
|
|
]
|
|
|
|
# If we have any local clients connected, we re-
|
|
# transmit the announce to them immediately
|
|
if (len(Transport.local_client_interfaces)):
|
|
announce_identity = RNS.Identity.recall(packet.destination_hash)
|
|
announce_destination = RNS.Destination(announce_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "unknown", "unknown");
|
|
announce_destination.hash = packet.destination_hash
|
|
announce_destination.hexhash = announce_destination.hash.hex()
|
|
announce_context = RNS.Packet.NONE
|
|
announce_data = packet.data
|
|
|
|
if Transport.from_local_client(packet) and packet.context == RNS.Packet.PATH_RESPONSE:
|
|
for local_interface in Transport.local_client_interfaces:
|
|
if packet.receiving_interface != local_interface:
|
|
new_announce = RNS.Packet(
|
|
announce_destination,
|
|
announce_data,
|
|
RNS.Packet.ANNOUNCE,
|
|
context = announce_context,
|
|
header_type = RNS.Packet.HEADER_2,
|
|
transport_type = Transport.TRANSPORT,
|
|
transport_id = Transport.identity.hash,
|
|
attached_interface = local_interface
|
|
)
|
|
|
|
new_announce.hops = packet.hops
|
|
new_announce.send()
|
|
|
|
else:
|
|
for local_interface in Transport.local_client_interfaces:
|
|
if packet.receiving_interface != local_interface:
|
|
new_announce = RNS.Packet(
|
|
announce_destination,
|
|
announce_data,
|
|
RNS.Packet.ANNOUNCE,
|
|
context = announce_context,
|
|
header_type = RNS.Packet.HEADER_2,
|
|
transport_type = Transport.TRANSPORT,
|
|
transport_id = Transport.identity.hash,
|
|
attached_interface = local_interface
|
|
)
|
|
|
|
new_announce.hops = packet.hops
|
|
new_announce.send()
|
|
|
|
destination_table_entry = [now, received_from, announce_hops, expires, random_blobs, packet.receiving_interface, packet]
|
|
Transport.destination_table[packet.destination_hash] = destination_table_entry
|
|
RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" is now "+str(announce_hops)+" hops away via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_VERBOSE)
|
|
|
|
# If the receiving interface is a tunnel, we add the
|
|
# announce to the tunnels table
|
|
if hasattr(packet.receiving_interface, "tunnel_id") and packet.receiving_interface.tunnel_id != None:
|
|
tunnel_entry = Transport.tunnels[packet.receiving_interface.tunnel_id]
|
|
paths = tunnel_entry[2]
|
|
paths[packet.destination_hash] = destination_table_entry
|
|
expires = time.time() + Transport.DESTINATION_TIMEOUT
|
|
tunnel_entry[3] = expires
|
|
RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" associated with tunnel "+RNS.prettyhexrep(packet.receiving_interface.tunnel_id), RNS.LOG_VERBOSE)
|
|
|
|
# Call externally registered callbacks from apps
|
|
# wanting to know when an announce arrives
|
|
if packet.context != RNS.Packet.PATH_RESPONSE:
|
|
for handler in Transport.announce_handlers:
|
|
try:
|
|
# Check that the announced destination matches
|
|
# the handlers aspect filter
|
|
execute_callback = False
|
|
if handler.aspect_filter == None:
|
|
# If the handlers aspect filter is set to
|
|
# None, we execute the callback in all cases
|
|
execute_callback = True
|
|
else:
|
|
announce_identity = RNS.Identity.recall(packet.destination_hash)
|
|
handler_expected_hash = RNS.Destination.hash_from_name_and_identity(handler.aspect_filter, announce_identity)
|
|
if packet.destination_hash == handler_expected_hash:
|
|
execute_callback = True
|
|
if execute_callback:
|
|
handler.received_announce(
|
|
destination_hash=packet.destination_hash,
|
|
announced_identity=announce_identity,
|
|
app_data=RNS.Identity.recall_app_data(packet.destination_hash)
|
|
)
|
|
except Exception as e:
|
|
RNS.log("Error while processing external announce callback.", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
# Handling for linkrequests to local destinations
|
|
elif packet.packet_type == RNS.Packet.LINKREQUEST:
|
|
for destination in Transport.destinations:
|
|
if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
|
|
packet.destination = destination
|
|
destination.receive(packet)
|
|
|
|
# Handling for local data packets
|
|
elif packet.packet_type == RNS.Packet.DATA:
|
|
if packet.destination_type == RNS.Destination.LINK:
|
|
for link in Transport.active_links:
|
|
if link.link_id == packet.destination_hash:
|
|
packet.link = link
|
|
link.receive(packet)
|
|
else:
|
|
for destination in Transport.destinations:
|
|
if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
|
|
packet.destination = destination
|
|
destination.receive(packet)
|
|
|
|
if destination.proof_strategy == RNS.Destination.PROVE_ALL:
|
|
packet.prove()
|
|
|
|
elif destination.proof_strategy == RNS.Destination.PROVE_APP:
|
|
if destination.callbacks.proof_requested:
|
|
if destination.callbacks.proof_requested(packet):
|
|
packet.prove()
|
|
|
|
# Handling for proofs and link-request proofs
|
|
elif packet.packet_type == RNS.Packet.PROOF:
|
|
if packet.context == RNS.Packet.LRPROOF:
|
|
# This is a link request proof, check if it
|
|
# needs to be transported
|
|
if (RNS.Reticulum.transport_enabled() or for_local_client_link or from_local_client) and packet.destination_hash in Transport.link_table:
|
|
link_entry = Transport.link_table[packet.destination_hash]
|
|
if packet.receiving_interface == link_entry[2]:
|
|
# TODO: Should we validate the LR proof at each transport
|
|
# step before transporting it?
|
|
RNS.log("Link request proof received on correct interface, transporting it via "+str(link_entry[4]), RNS.LOG_DEBUG)
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
Transport.link_table[packet.destination_hash][7] = True
|
|
link_entry[4].processOutgoing(new_raw)
|
|
else:
|
|
RNS.log("Link request proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
|
|
else:
|
|
# Check if we can deliver it to a local
|
|
# pending link
|
|
for link in Transport.pending_links:
|
|
if link.link_id == packet.destination_hash:
|
|
link.validate_proof(packet)
|
|
|
|
elif packet.context == RNS.Packet.RESOURCE_PRF:
|
|
for link in Transport.active_links:
|
|
if link.link_id == packet.destination_hash:
|
|
link.receive(packet)
|
|
else:
|
|
if packet.destination_type == RNS.Destination.LINK:
|
|
for link in Transport.active_links:
|
|
if link.link_id == packet.destination_hash:
|
|
packet.link = link
|
|
|
|
if len(packet.data) == RNS.PacketReceipt.EXPL_LENGTH:
|
|
proof_hash = packet.data[:RNS.Identity.HASHLENGTH//8]
|
|
else:
|
|
proof_hash = None
|
|
|
|
# Check if this proof neds to be transported
|
|
if (RNS.Reticulum.transport_enabled() or from_local_client or proof_for_local_client) and packet.destination_hash in Transport.reverse_table:
|
|
reverse_entry = Transport.reverse_table.pop(packet.destination_hash)
|
|
if packet.receiving_interface == reverse_entry[1]:
|
|
RNS.log("Proof received on correct interface, transporting it via "+str(reverse_entry[0]), RNS.LOG_DEBUG)
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
reverse_entry[0].processOutgoing(new_raw)
|
|
else:
|
|
RNS.log("Proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
|
|
|
|
for receipt in Transport.receipts:
|
|
receipt_validated = False
|
|
if proof_hash != None:
|
|
# Only test validation if hash matches
|
|
if receipt.hash == proof_hash:
|
|
receipt_validated = receipt.validate_proof_packet(packet)
|
|
else:
|
|
# TODO: This looks like it should actually
|
|
# be rewritten when implicit proofs are added.
|
|
|
|
# In case of an implicit proof, we have
|
|
# to check every single outstanding receipt
|
|
receipt_validated = receipt.validate_proof_packet(packet)
|
|
|
|
if receipt_validated:
|
|
if receipt in Transport.receipts:
|
|
Transport.receipts.remove(receipt)
|
|
|
|
Transport.jobs_locked = False
|
|
|
|
@staticmethod
|
|
def synthesize_tunnel(interface):
|
|
interface_hash = interface.get_hash()
|
|
public_key = RNS.Transport.identity.get_public_key()
|
|
random_hash = RNS.Identity.get_random_hash()
|
|
|
|
tunnel_id_data = public_key+interface_hash
|
|
tunnel_id = RNS.Identity.full_hash(tunnel_id_data)
|
|
|
|
signed_data = tunnel_id_data+random_hash
|
|
signature = Transport.identity.sign(signed_data)
|
|
|
|
data = signed_data+signature
|
|
|
|
tnl_snth_dst = RNS.Destination(None, RNS.Destination.OUT, RNS.Destination.PLAIN, Transport.APP_NAME, "tunnel", "synthesize")
|
|
|
|
packet = RNS.Packet(tnl_snth_dst, data, packet_type = RNS.Packet.DATA, transport_type = RNS.Transport.BROADCAST, header_type = RNS.Packet.HEADER_1, attached_interface = interface)
|
|
packet.send()
|
|
|
|
interface.wants_tunnel = False
|
|
|
|
@staticmethod
|
|
def tunnel_synthesize_handler(data, packet):
|
|
try:
|
|
expected_length = RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+RNS.Reticulum.TRUNCATED_HASHLENGTH//8+RNS.Identity.SIGLENGTH//8
|
|
if len(data) == expected_length:
|
|
public_key = data[:RNS.Identity.KEYSIZE//8]
|
|
interface_hash = data[RNS.Identity.KEYSIZE//8:RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8]
|
|
tunnel_id_data = public_key+interface_hash
|
|
tunnel_id = RNS.Identity.full_hash(tunnel_id_data)
|
|
random_hash = data[RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+RNS.Reticulum.TRUNCATED_HASHLENGTH//8]
|
|
|
|
signature = data[RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+RNS.Reticulum.TRUNCATED_HASHLENGTH//8:expected_length]
|
|
signed_data = tunnel_id_data+random_hash
|
|
|
|
remote_transport_identity = RNS.Identity(create_keys=False)
|
|
remote_transport_identity.load_public_key(public_key)
|
|
|
|
if remote_transport_identity.validate(signature, signed_data):
|
|
Transport.handle_tunnel(tunnel_id, packet.receiving_interface)
|
|
|
|
except Exception as e:
|
|
RNS.log("An error occurred while validating tunnel establishment packet.", RNS.LOG_DEBUG)
|
|
RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
|
|
|
|
@staticmethod
|
|
def handle_tunnel(tunnel_id, interface):
|
|
expires = time.time() + Transport.DESTINATION_TIMEOUT
|
|
if not tunnel_id in Transport.tunnels:
|
|
RNS.log("Tunnel endpoint "+RNS.prettyhexrep(tunnel_id)+" established.", RNS.LOG_DEBUG)
|
|
paths = {}
|
|
tunnel_entry = [tunnel_id, interface, paths, expires]
|
|
interface.tunnel_id = tunnel_id
|
|
Transport.tunnels[tunnel_id] = tunnel_entry
|
|
else:
|
|
RNS.log("Tunnel endpoint "+RNS.prettyhexrep(tunnel_id)+" reappeared. Restoring paths...", RNS.LOG_DEBUG)
|
|
tunnel_entry = Transport.tunnels[tunnel_id]
|
|
tunnel_entry[1] = interface
|
|
tunnel_entry[3] = expires
|
|
interface.tunnel_id = tunnel_id
|
|
paths = tunnel_entry[2]
|
|
|
|
deprecated_paths = []
|
|
for destination_hash, path_entry in paths.items():
|
|
received_from = path_entry[1]
|
|
announce_hops = path_entry[2]
|
|
expires = path_entry[3]
|
|
random_blobs = path_entry[4]
|
|
receiving_interface = interface
|
|
packet = path_entry[6]
|
|
new_entry = [time.time(), received_from, announce_hops, expires, random_blobs, receiving_interface, packet]
|
|
|
|
should_add = False
|
|
if destination_hash in Transport.destination_table:
|
|
old_entry = Transport.destination_table[destination_hash]
|
|
old_hops = old_entry[2]
|
|
old_expires = old_entry[3]
|
|
if announce_hops <= old_hops or time.time() > old_expires:
|
|
should_add = True
|
|
else:
|
|
RNS.log("Did not restore path to "+RNS.prettyhexrep(packet.destination_hash)+" because a newer path with fewer hops exist", RNS.LOG_DEBUG)
|
|
else:
|
|
if time.time() < expires:
|
|
should_add = True
|
|
else:
|
|
RNS.log("Did not restore path to "+RNS.prettyhexrep(packet.destination_hash)+" because it has expired", RNS.LOG_DEBUG)
|
|
|
|
if should_add:
|
|
Transport.destination_table[destination_hash] = new_entry
|
|
RNS.log("Restored path to "+RNS.prettyhexrep(packet.destination_hash)+" is now "+str(announce_hops)+" hops away via "+RNS.prettyhexrep(received_from)+" on "+str(receiving_interface), RNS.LOG_DEBUG)
|
|
else:
|
|
deprecated_paths.append(destination_hash)
|
|
|
|
for deprecated_path in deprecated_paths:
|
|
RNS.log("Removing path to "+RNS.prettyhexrep(deprecated_path)+" from tunnel "+RNS.prettyhexrep(tunnel_id), RNS.LOG_DEBUG)
|
|
paths.pop(deprecated_path)
|
|
|
|
|
|
|
|
|
|
|
|
@staticmethod
|
|
def register_destination(destination):
|
|
destination.MTU = RNS.Reticulum.MTU
|
|
if destination.direction == RNS.Destination.IN:
|
|
for registered_destination in Transport.destinations:
|
|
if destination.hash == registered_destination.hash:
|
|
raise KeyError("Attempt to register an already registered destination.")
|
|
|
|
Transport.destinations.append(destination)
|
|
|
|
if Transport.owner.is_connected_to_shared_instance:
|
|
if destination.type == RNS.Destination.SINGLE:
|
|
destination.announce(path_response=True)
|
|
|
|
@staticmethod
|
|
def deregister_destination(destination):
|
|
if destination in Transport.destinations:
|
|
Transport.destinations.remove(destination)
|
|
|
|
@staticmethod
|
|
def register_link(link):
|
|
RNS.log("Registering link "+str(link), RNS.LOG_DEBUG)
|
|
if link.initiator:
|
|
Transport.pending_links.append(link)
|
|
else:
|
|
Transport.active_links.append(link)
|
|
|
|
@staticmethod
|
|
def activate_link(link):
|
|
RNS.log("Activating link "+str(link), RNS.LOG_DEBUG)
|
|
if link in Transport.pending_links:
|
|
Transport.pending_links.remove(link)
|
|
Transport.active_links.append(link)
|
|
link.status = RNS.Link.ACTIVE
|
|
else:
|
|
RNS.log("Attempted to activate a link that was not in the pending table", RNS.LOG_ERROR)
|
|
|
|
@staticmethod
|
|
def register_announce_handler(handler):
|
|
"""
|
|
Registers an announce handler.
|
|
|
|
:param handler: Must be an object with an *aspect_filter* attribute and a *received_announce(destination_hash, announced_identity, app_data)* callable. See the :ref:`Announce Example<example-announce>` for more info.
|
|
"""
|
|
if hasattr(handler, "received_announce") and callable(handler.received_announce):
|
|
if hasattr(handler, "aspect_filter"):
|
|
Transport.announce_handlers.append(handler)
|
|
|
|
@staticmethod
|
|
def deregister_announce_handler(handler):
|
|
"""
|
|
Deregisters an announce handler.
|
|
|
|
:param handler: The announce handler to be deregistered.
|
|
"""
|
|
while handler in Transport.announce_handlers:
|
|
Transport.announce_handlers.remove(handler)
|
|
|
|
@staticmethod
|
|
def find_interface_from_hash(interface_hash):
|
|
for interface in Transport.interfaces:
|
|
if interface.get_hash() == interface_hash:
|
|
return interface
|
|
|
|
return None
|
|
|
|
@staticmethod
|
|
def should_cache(packet):
|
|
if packet.context == RNS.Packet.RESOURCE_PRF:
|
|
return True
|
|
|
|
return False
|
|
|
|
# When caching packets to storage, they are written
|
|
# exactly as they arrived over their interface. This
|
|
# means that they have not had their hop count
|
|
# increased yet! Take note of this when reading from
|
|
# the packet cache.
|
|
@staticmethod
|
|
def cache(packet, force_cache=False):
|
|
if RNS.Transport.should_cache(packet) or force_cache:
|
|
try:
|
|
packet_hash = RNS.hexrep(packet.get_hash(), delimit=False)
|
|
interface_reference = None
|
|
if packet.receiving_interface != None:
|
|
interface_reference = str(packet.receiving_interface)
|
|
|
|
file = open(RNS.Reticulum.cachepath+"/"+packet_hash, "wb")
|
|
file.write(umsgpack.packb([packet.raw, interface_reference]))
|
|
file.close()
|
|
|
|
except Exception as e:
|
|
RNS.log("Error writing packet to cache", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e))
|
|
|
|
@staticmethod
|
|
def get_cached_packet(packet_hash):
|
|
try:
|
|
packet_hash = RNS.hexrep(packet_hash, delimit=False)
|
|
path = RNS.Reticulum.cachepath+"/"+packet_hash
|
|
|
|
if os.path.isfile(path):
|
|
file = open(path, "rb")
|
|
cached_data = umsgpack.unpackb(file.read())
|
|
file.close()
|
|
|
|
packet = RNS.Packet(None, cached_data[0])
|
|
interface_reference = cached_data[1]
|
|
|
|
for interface in Transport.interfaces:
|
|
if str(interface) == interface_reference:
|
|
packet.receiving_interface = interface
|
|
|
|
return packet
|
|
else:
|
|
return None
|
|
except Exception as e:
|
|
RNS.log("Exception occurred while getting cached packet.", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
@staticmethod
|
|
def cache_request_packet(packet):
|
|
if len(packet.data) == RNS.Identity.HASHLENGTH/8:
|
|
packet = Transport.get_cached_packet(packet.data)
|
|
|
|
if packet != None:
|
|
# If the packet was retrieved from the local
|
|
# cache, replay it to the Transport instance,
|
|
# so that it can be directed towards it original
|
|
# destination.
|
|
Transport.inbound(packet.raw, packet.receiving_interface)
|
|
return True
|
|
else:
|
|
return False
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def cache_request(packet_hash, destination):
|
|
cached_packet = Transport.get_cached_packet(packet_hash)
|
|
if cached_packet:
|
|
# The packet was found in the local cache,
|
|
# replay it to the Transport instance.
|
|
Transport.inbound(packet.raw, packet.receiving_interface)
|
|
else:
|
|
# The packet is not in the local cache,
|
|
# query the network.
|
|
RNS.Packet(destination, packet_hash, context = RNS.Packet.CACHE_REQUEST).send()
|
|
|
|
@staticmethod
|
|
def has_path(destination_hash):
|
|
"""
|
|
:param destination_hash: A destination hash as *bytes*.
|
|
:returns: *True* if a path to the destination is known, otherwise *False*.
|
|
"""
|
|
if destination_hash in Transport.destination_table:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def hops_to(destination_hash):
|
|
"""
|
|
:param destination_hash: A destination hash as *bytes*.
|
|
:returns: The number of hops to the specified destination, or ``RNS.Transport.PATHFINDER_M`` if the number of hops is unknown.
|
|
"""
|
|
if destination_hash in Transport.destination_table:
|
|
return Transport.destination_table[destination_hash][2]
|
|
else:
|
|
return Transport.PATHFINDER_M
|
|
|
|
@staticmethod
|
|
def next_hop(destination_hash):
|
|
"""
|
|
:param destination_hash: A destination hash as *bytes*.
|
|
:returns: The destination hash as *bytes* for the next hop to the specified destination, or *None* if the next hop is unknown.
|
|
"""
|
|
if destination_hash in Transport.destination_table:
|
|
return Transport.destination_table[destination_hash][1]
|
|
else:
|
|
return None
|
|
|
|
@staticmethod
|
|
def next_hop_interface(destination_hash):
|
|
"""
|
|
:param destination_hash: A destination hash as *bytes*.
|
|
:returns: The interface for the next hop to the specified destination, or *None* if the interface is unknown.
|
|
"""
|
|
if destination_hash in Transport.destination_table:
|
|
return Transport.destination_table[destination_hash][5]
|
|
else:
|
|
return None
|
|
|
|
@staticmethod
|
|
def request_path(destination_hash):
|
|
"""
|
|
Requests a path to the destination from the network. If
|
|
another reachable peer on the network knows a path, it
|
|
will announce it.
|
|
|
|
:param destination_hash: A destination hash as *bytes*.
|
|
"""
|
|
path_request_data = destination_hash + RNS.Identity.get_random_hash()
|
|
path_request_dst = RNS.Destination(None, RNS.Destination.OUT, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
|
|
packet = RNS.Packet(path_request_dst, path_request_data, packet_type = RNS.Packet.DATA, transport_type = RNS.Transport.BROADCAST, header_type = RNS.Packet.HEADER_1)
|
|
packet.send()
|
|
|
|
@staticmethod
|
|
def request_path_on_interface(destination_hash, interface):
|
|
path_request_data = destination_hash + RNS.Identity.get_random_hash()
|
|
path_request_dst = RNS.Destination(None, RNS.Destination.OUT, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
|
|
packet = RNS.Packet(path_request_dst, path_request_data, packet_type = RNS.Packet.DATA, transport_type = RNS.Transport.BROADCAST, header_type = RNS.Packet.HEADER_1, attached_interface = interface)
|
|
packet.send()
|
|
|
|
@staticmethod
|
|
def path_request_handler(data, packet):
|
|
if len(data) >= RNS.Identity.TRUNCATED_HASHLENGTH//8:
|
|
Transport.path_request(
|
|
data[:RNS.Identity.TRUNCATED_HASHLENGTH//8],
|
|
Transport.from_local_client(packet),
|
|
packet.receiving_interface
|
|
)
|
|
|
|
@staticmethod
|
|
def path_request(destination_hash, is_from_local_client, attached_interface):
|
|
RNS.log("Path request for "+RNS.prettyhexrep(destination_hash), RNS.LOG_DEBUG)
|
|
|
|
local_destination = next((d for d in Transport.destinations if d.hash == destination_hash), None)
|
|
if local_destination != None:
|
|
RNS.log("Destination is local to this system, announcing", RNS.LOG_DEBUG)
|
|
local_destination.announce(path_response=True)
|
|
|
|
elif (RNS.Reticulum.transport_enabled() or is_from_local_client or len(Transport.local_client_interfaces) > 0) and destination_hash in Transport.destination_table:
|
|
RNS.log("Path found, inserting announce for transmission", RNS.LOG_DEBUG)
|
|
packet = Transport.destination_table[destination_hash][6]
|
|
received_from = Transport.destination_table[destination_hash][5]
|
|
|
|
now = time.time()
|
|
retries = Transport.PATHFINDER_R
|
|
local_rebroadcasts = 0
|
|
block_rebroadcasts = True
|
|
announce_hops = packet.hops
|
|
|
|
if is_from_local_client:
|
|
retransmit_timeout = now
|
|
else:
|
|
# TODO: Look at this timing
|
|
retransmit_timeout = now + Transport.PATH_REQUEST_GRACE # + (RNS.rand() * Transport.PATHFINDER_RW)
|
|
|
|
# This handles an edge case where a peer sends a past
|
|
# request for a destination just after an announce for
|
|
# said destination has arrived, but before it has been
|
|
# rebroadcast locally. In such a case the actual announce
|
|
# is temporarily held, and then reinserted when the path
|
|
# request has been served to the peer.
|
|
if packet.destination_hash in Transport.announce_table:
|
|
held_entry = Transport.announce_table[packet.destination_hash]
|
|
Transport.held_announces[packet.destination_hash] = held_entry
|
|
|
|
Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, announce_hops, packet, local_rebroadcasts, block_rebroadcasts, attached_interface]
|
|
|
|
elif is_from_local_client:
|
|
# Forward path request on all interfaces
|
|
# except the local client
|
|
for interface in Transport.interfaces:
|
|
if not interface == attached_interface:
|
|
Transport.request_path_on_interface(destination_hash, interface)
|
|
|
|
elif not is_from_local_client and len(Transport.local_client_interfaces) > 0:
|
|
# Forward the path request on all local
|
|
# client interfaces
|
|
for interface in Transport.local_client_interfaces:
|
|
Transport.request_path_on_interface(destination_hash, interface)
|
|
|
|
else:
|
|
RNS.log("No known path to requested destination, ignoring request", RNS.LOG_DEBUG)
|
|
|
|
@staticmethod
|
|
def from_local_client(packet):
|
|
if hasattr(packet.receiving_interface, "parent_interface"):
|
|
return Transport.is_local_client_interface(packet.receiving_interface)
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def is_local_client_interface(interface):
|
|
if hasattr(interface, "parent_interface"):
|
|
if hasattr(interface.parent_interface, "is_local_shared_instance"):
|
|
return True
|
|
else:
|
|
return False
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def interface_to_shared_instance(interface):
|
|
if hasattr(interface, "is_connected_to_shared_instance"):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def detach_interfaces():
|
|
for interface in Transport.interfaces:
|
|
interface.detach()
|
|
|
|
for interface in Transport.local_client_interfaces:
|
|
interface.detach()
|
|
|
|
|
|
@staticmethod
|
|
def exit_handler():
|
|
try:
|
|
if not RNS.Reticulum.transport_enabled():
|
|
Transport.packet_hashlist = []
|
|
else:
|
|
RNS.log("Saving packet hashlist to storage...", RNS.LOG_VERBOSE)
|
|
|
|
packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
|
|
file = open(packet_hashlist_path, "wb")
|
|
file.write(umsgpack.packb(Transport.packet_hashlist))
|
|
file.close()
|
|
|
|
except Exception as e:
|
|
RNS.log("Could not save packet hashlist to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
if not Transport.owner.is_connected_to_shared_instance:
|
|
RNS.log("Saving path table to storage...", RNS.LOG_VERBOSE)
|
|
try:
|
|
serialised_destinations = []
|
|
for destination_hash in Transport.destination_table:
|
|
# Get the destination entry from the destination table
|
|
de = Transport.destination_table[destination_hash]
|
|
interface_hash = de[5].get_hash()
|
|
|
|
# Only store destination table entry if the associated
|
|
# interface is still active
|
|
interface = Transport.find_interface_from_hash(interface_hash)
|
|
if interface != None:
|
|
# Get the destination entry from the destination table
|
|
de = Transport.destination_table[destination_hash]
|
|
timestamp = de[0]
|
|
received_from = de[1]
|
|
hops = de[2]
|
|
expires = de[3]
|
|
random_blobs = de[4]
|
|
packet_hash = de[6].get_hash()
|
|
|
|
serialised_entry = [
|
|
destination_hash,
|
|
timestamp,
|
|
received_from,
|
|
hops,
|
|
expires,
|
|
random_blobs,
|
|
interface_hash,
|
|
packet_hash
|
|
]
|
|
|
|
serialised_destinations.append(serialised_entry)
|
|
|
|
Transport.cache(de[6], force_cache=True)
|
|
|
|
destination_table_path = RNS.Reticulum.storagepath+"/destination_table"
|
|
file = open(destination_table_path, "wb")
|
|
file.write(umsgpack.packb(serialised_destinations))
|
|
file.close()
|
|
RNS.log("Done saving "+str(len(serialised_destinations))+" path table entries to storage", RNS.LOG_VERBOSE)
|
|
except Exception as e:
|
|
RNS.log("Could not save path table to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
RNS.log("Saving tunnel table to storage...", RNS.LOG_VERBOSE)
|
|
try:
|
|
serialised_tunnels = []
|
|
for tunnel_id in Transport.tunnels:
|
|
te = Transport.tunnels[tunnel_id]
|
|
interface = te[1]
|
|
tunnel_paths = te[2]
|
|
expires = te[3]
|
|
|
|
if interface != None:
|
|
interface_hash = interface.get_hash()
|
|
else:
|
|
interface_hash = None
|
|
|
|
serialised_paths = []
|
|
for destination_hash in tunnel_paths:
|
|
de = tunnel_paths[destination_hash]
|
|
|
|
timestamp = de[0]
|
|
received_from = de[1]
|
|
hops = de[2]
|
|
expires = de[3]
|
|
random_blobs = de[4]
|
|
packet_hash = de[6].get_hash()
|
|
|
|
serialised_entry = [
|
|
destination_hash,
|
|
timestamp,
|
|
received_from,
|
|
hops,
|
|
expires,
|
|
random_blobs,
|
|
interface_hash,
|
|
packet_hash
|
|
]
|
|
|
|
serialised_paths.append(serialised_entry)
|
|
|
|
Transport.cache(de[6], force_cache=True)
|
|
|
|
|
|
serialised_tunnel = [tunnel_id, interface_hash, serialised_paths, expires]
|
|
serialised_tunnels.append(serialised_tunnel)
|
|
|
|
tunnels_path = RNS.Reticulum.storagepath+"/tunnels"
|
|
file = open(tunnels_path, "wb")
|
|
file.write(umsgpack.packb(serialised_tunnels))
|
|
file.close()
|
|
RNS.log("Done saving "+str(len(serialised_tunnels))+" tunnel table entries to storage", RNS.LOG_VERBOSE)
|
|
except Exception as e:
|
|
RNS.log("Could not save tunnel table to storage, the contained exception was: "+str(e), RNS.LOG_ERROR) |