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Reticulum/RNS/Transport.py
Mark Qvist 5dd2c31caf Generate receipts prior to raw transmit
2023-11-13 23:12:59 +01:00

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# MIT License
#
# Copyright (c) 2016-2023 Mark Qvist / unsigned.io and contributors.
#
# 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.
import os
import RNS
import time
import math
import struct
import threading
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_R = 1 # Retransmit retries
PATHFINDER_G = 5 # Retry grace period
PATHFINDER_RW = 0.5 # Random window for announce rebroadcast
PATHFINDER_E = 60*60*24*7 # Path expiration of one week
AP_PATH_TIME = 60*60*24 # Path expiration of one day for Access Point paths
ROAMING_PATH_TIME = 60*60*6 # Path expiration of 6 hours for Roaming paths
# 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_TIMEOUT = 15 # Default timuout for client path requests in seconds
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
PATH_REQUEST_MI = 20 # Minimum interval in seconds for automated path requests
STATE_UNKNOWN = 0x00
STATE_UNRESPONSIVE = 0x01
STATE_RESPONSIVE = 0x02
LINK_TIMEOUT = RNS.Link.STALE_TIME * 1.25
REVERSE_TIMEOUT = 30*60 # Reverse table entries are removed after 30 minutes
DESTINATION_TIMEOUT = 60*60*24*7 # Destination table entries are removed if unused for one week
MAX_RECEIPTS = 1024 # Maximum number of receipts to keep track of
MAX_RATE_TIMESTAMPS = 16 # Maximum number of announce timestamps to keep per destination
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
announce_rate_table = {} # A table for keeping track of announce rates
path_requests = {} # A table for storing path request timestamps
path_states = {} # A table for keeping track of path states
discovery_path_requests = {} # A table for keeping track of path requests on behalf of other nodes
discovery_pr_tags = [] # A table for keeping track of tagged path requests
max_pr_tags = 32000 # Maximum amount of unique path request tags to remember
# 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 = []
local_client_rssi_cache = []
local_client_snr_cache = []
local_client_q_cache = []
LOCAL_CLIENT_CACHE_MAXSIZE = 512
pending_local_path_requests = {}
start_time = None
jobs_locked = False
jobs_running = False
job_interval = 0.250
links_last_checked = 0.0
links_check_interval = 1.0
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
interface_last_jobs = 0.0
interface_jobs_interval = 5.0
identity = None
@staticmethod
def start(reticulum_instance):
Transport.jobs_running = True
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 not Transport.owner.is_connected_to_shared_instance:
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)
Transport.jobs_running = False
thread = threading.Thread(target=Transport.jobloop, daemon=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]
if len(destination_hash) == RNS.Reticulum.TRUNCATED_HASHLENGTH//8:
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)
if RNS.Reticulum.probe_destination_enabled():
Transport.probe_destination = RNS.Destination(Transport.identity, RNS.Destination.IN, RNS.Destination.SINGLE, Transport.APP_NAME, "probe")
Transport.probe_destination.accepts_links(False)
Transport.probe_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
Transport.probe_destination.announce()
RNS.log("Transport Instance will respond to probe requests on "+str(Transport.probe_destination), RNS.LOG_NOTICE)
else:
Transport.probe_destination = None
RNS.log("Transport instance "+str(Transport.identity)+" started", RNS.LOG_VERBOSE)
Transport.start_time = time.time()
# 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 = []
path_requests = {}
blocked_if = None
Transport.jobs_running = True
try:
if not Transport.jobs_locked:
# Process active and pending link lists
if time.time() > Transport.links_last_checked+Transport.links_check_interval:
for link in Transport.pending_links:
if link.status == RNS.Link.CLOSED:
# If we are not a Transport Instance, finding a pending link
# that was never activated will trigger an expiry of the path
# to the destination, and an attempt to rediscover the path.
if not RNS.Reticulum.transport_enabled():
Transport.expire_path(link.destination.hash)
# If we are connected to a shared instance, it will take
# care of sending out a new path request. If not, we will
# send one directly.
if not Transport.owner.is_connected_to_shared_instance:
last_path_request = 0
if link.destination.hash in Transport.path_requests:
last_path_request = Transport.path_requests[link.destination.hash]
if time.time() - last_path_request > Transport.PATH_REQUEST_MI:
RNS.log("Trying to rediscover path for "+RNS.prettyhexrep(link.destination.hash)+" since an attempted link was never established", RNS.LOG_DEBUG)
if not link.destination.hash in path_requests:
blocked_if = None
path_requests[link.destination.hash] = blocked_if
Transport.pending_links.remove(link)
for link in Transport.active_links:
if link.status == RNS.Link.CLOSED:
Transport.active_links.remove(link)
Transport.links_last_checked = time.time()
# 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:
if receipt in Transport.receipts:
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:
completed_announces = []
for destination_hash in Transport.announce_table:
announce_entry = Transport.announce_table[destination_hash]
if announce_entry[2] > Transport.PATHFINDER_R:
RNS.log("Completed announce processing for "+RNS.prettyhexrep(destination_hash)+", retry limit reached", RNS.LOG_EXTREME)
completed_announces.append(destination_hash)
else:
if time.time() > announce_entry[1]:
announce_entry[1] = time.time() + Transport.PATHFINDER_G + 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)
for destination_hash in completed_announces:
if destination_hash in Transport.announce_table:
Transport.announce_table.pop(destination_hash)
Transport.announces_last_checked = time.time()
# Cull the packet hashlist if it has reached its 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]
# Cull the path request tags list if it has reached its max size
if len(Transport.discovery_pr_tags) > Transport.max_pr_tags:
Transport.discovery_pr_tags = Transport.discovery_pr_tags[len(Transport.discovery_pr_tags)-Transport.max_pr_tags:len(Transport.discovery_pr_tags)-1]
if time.time() > Transport.tables_last_culled + Transport.tables_cull_interval:
# Remove unneeded path state entries
stale_path_states = []
for destination_hash in Transport.path_states:
if not destination_hash in Transport.destination_table:
stale_path_states.append(destination_hash)
# 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 link_entry[7] == True:
if time.time() > link_entry[0] + Transport.LINK_TIMEOUT:
stale_links.append(link_id)
else:
if time.time() > link_entry[8]:
stale_links.append(link_id)
last_path_request = 0
if link_entry[6] in Transport.path_requests:
last_path_request = Transport.path_requests[link_entry[6]]
lr_taken_hops = link_entry[5]
path_request_throttle = time.time() - last_path_request < Transport.PATH_REQUEST_MI
path_request_conditions = False
# If the path has been invalidated between the time of
# making the link request and now, try to rediscover it
if not Transport.has_path(link_entry[6]):
RNS.log("Trying to rediscover path for "+RNS.prettyhexrep(link_entry[6])+" since an attempted link was never established, and path is now missing", RNS.LOG_DEBUG)
path_request_conditions =True
# If this link request was originated from a local client
# attempt to rediscover a path to the destination, if this
# has not already happened recently.
elif not path_request_throttle and lr_taken_hops == 0:
RNS.log("Trying to rediscover path for "+RNS.prettyhexrep(link_entry[6])+" since an attempted local client link was never established", RNS.LOG_DEBUG)
path_request_conditions = True
# If the link destination was previously only 1 hop
# away, this likely means that it was local to one
# of our interfaces, and that it roamed somewhere else.
# In that case, try to discover a new path.
elif not path_request_throttle and Transport.hops_to(link_entry[6]) == 1:
RNS.log("Trying to rediscover path for "+RNS.prettyhexrep(link_entry[6])+" since an attempted link was never established, and destination was previously local to an interface on this instance", RNS.LOG_DEBUG)
path_request_conditions = True
blocked_if = link_entry[4]
# If the link initiator is only 1 hop away,
# this likely means that network topology has
# changed. In that case, we try to discover a new path,
# and mark the old one as potentially unresponsive.
elif not path_request_throttle and lr_taken_hops == 1:
RNS.log("Trying to rediscover path for "+RNS.prettyhexrep(link_entry[6])+" since an attempted link was never established, and link initiator is local to an interface on this instance", RNS.LOG_DEBUG)
path_request_conditions = True
blocked_if = link_entry[4]
if RNS.Reticulum.transport_enabled():
if hasattr(link_entry[4], "mode") and link_entry[4].mode != RNS.Interfaces.Interface.Interface.MODE_BOUNDARY:
Transport.mark_path_unresponsive(link_entry[6])
if path_request_conditions:
if not link_entry[6] in path_requests:
path_requests[link_entry[6]] = blocked_if
if not RNS.Reticulum.transport_enabled():
# Drop current path if we are not a transport instance, to
# allow using higher-hop count paths or reused announces
# from newly adjacent transport instances.
Transport.expire_path(link_entry[6])
# 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 attached_interface != None and hasattr(attached_interface, "mode") and attached_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT:
destination_expiry = destination_entry[0] + Transport.AP_PATH_TIME
elif attached_interface != None and hasattr(attached_interface, "mode") and attached_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
destination_expiry = destination_entry[0] + Transport.ROAMING_PATH_TIME
else:
destination_expiry = destination_entry[0] + Transport.DESTINATION_TIMEOUT
if time.time() > destination_expiry:
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 pending discovery path requests table
stale_discovery_path_requests = []
for destination_hash in Transport.discovery_path_requests:
entry = Transport.discovery_path_requests[destination_hash]
if time.time() > entry["timeout"]:
stale_discovery_path_requests.append(destination_hash)
RNS.log("Waiting path request for "+RNS.prettyhexrep(destination_hash)+" timed out and was removed", 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_EXTREME)
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_EXTREME)
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_EXTREME)
else:
RNS.log("Removed "+str(ti)+" tunnel paths", RNS.LOG_EXTREME)
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("Released "+str(i)+" reverse table entry", RNS.LOG_EXTREME)
else:
RNS.log("Released "+str(i)+" reverse table entries", RNS.LOG_EXTREME)
i = 0
for link_id in stale_links:
Transport.link_table.pop(link_id)
i += 1
if i > 0:
if i == 1:
RNS.log("Released "+str(i)+" link", RNS.LOG_EXTREME)
else:
RNS.log("Released "+str(i)+" links", RNS.LOG_EXTREME)
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_EXTREME)
else:
RNS.log("Removed "+str(i)+" paths", RNS.LOG_EXTREME)
i = 0
for destination_hash in stale_discovery_path_requests:
Transport.discovery_path_requests.pop(destination_hash)
i += 1
if i > 0:
if i == 1:
RNS.log("Removed "+str(i)+" waiting path request", RNS.LOG_EXTREME)
else:
RNS.log("Removed "+str(i)+" waiting path requests", RNS.LOG_EXTREME)
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_EXTREME)
else:
RNS.log("Removed "+str(i)+" tunnels", RNS.LOG_EXTREME)
i = 0
for destination_hash in stale_path_states:
Transport.path_states.pop(destination_hash)
i += 1
if i > 0:
if i == 1:
RNS.log("Removed "+str(i)+" path state entry", RNS.LOG_EXTREME)
else:
RNS.log("Removed "+str(i)+" path state entries", RNS.LOG_EXTREME)
Transport.tables_last_culled = time.time()
if time.time() > Transport.interface_last_jobs + Transport.interface_jobs_interval:
for interface in Transport.interfaces:
interface.process_held_announces()
Transport.interface_last_jobs = time.time()
else:
# Transport jobs were locked, do nothing
pass
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)
Transport.jobs_running = False
for packet in outgoing:
packet.send()
for destination_hash in path_requests:
blocked_if = path_requests[destination_hash]
if blocked_if == None:
Transport.request_path(destination_hash)
else:
for interface in Transport.interfaces:
if interface != blocked_if:
# RNS.log("Transmitting path request on "+str(interface), RNS.LOG_DEBUG)
Transport.request_path(destination_hash, on_interface=interface)
else:
pass
# RNS.log("Blocking path request on "+str(interface), RNS.LOG_DEBUG)
@staticmethod
def transmit(interface, raw):
try:
if hasattr(interface, "ifac_identity") and interface.ifac_identity != None:
# Calculate packet access code
ifac = interface.ifac_identity.sign(raw)[-interface.ifac_size:]
# Generate mask
mask = RNS.Cryptography.hkdf(
length=len(raw)+interface.ifac_size,
derive_from=ifac,
salt=interface.ifac_key,
context=None,
)
# Set IFAC flag
new_header = bytes([raw[0] | 0x80, raw[1]])
# Assemble new payload with IFAC
new_raw = new_header+ifac+raw[2:]
# Mask payload
i = 0; masked_raw = b""
for byte in new_raw:
if i == 0:
# Mask first header byte, but make sure the
# IFAC flag is still set
masked_raw += bytes([byte ^ mask[i] | 0x80])
elif i == 1 or i > interface.ifac_size+1:
# Mask second header byte and payload
masked_raw += bytes([byte ^ mask[i]])
else:
# Don't mask the IFAC itself
masked_raw += bytes([byte])
i += 1
# Send it
interface.processOutgoing(masked_raw)
else:
interface.processOutgoing(raw)
except Exception as e:
RNS.log("Error while transmitting on "+str(interface)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
@staticmethod
def outbound(packet):
while (Transport.jobs_running):
sleep(0.0005)
Transport.jobs_locked = True
sent = False
outbound_time = time.time()
generate_receipt = False
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)):
generate_receipt = True
def packet_sent(packet):
packet.sent = True
packet.sent_at = time.time()
if generate_receipt:
packet.receipt = RNS.PacketReceipt(packet)
Transport.receipts.append(packet.receipt)
Transport.cache(packet)
# Check if we have a known path for the destination in the path table
if packet.packet_type != RNS.Packet.ANNOUNCE and packet.destination.type != RNS.Destination.PLAIN and packet.destination.type != RNS.Destination.GROUP 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:]
packet_sent(packet)
Transport.transmit(outbound_interface, 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:]
packet_sent(packet)
Transport.transmit(outbound_interface, 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:
packet_sent(packet)
Transport.transmit(outbound_interface, 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 packet.packet_type == RNS.Packet.ANNOUNCE:
if packet.attached_interface == None:
if interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT:
RNS.log("Blocking announce broadcast on "+str(interface)+" due to AP mode", RNS.LOG_EXTREME)
should_transmit = False
elif interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
local_destination = next((d for d in Transport.destinations if d.hash == packet.destination_hash), None)
if local_destination != None:
# RNS.log("Allowing announce broadcast on roaming-mode interface from instance-local destination", RNS.LOG_EXTREME)
pass
else:
from_interface = Transport.next_hop_interface(packet.destination_hash)
if from_interface == None or not hasattr(from_interface, "mode"):
should_transmit = False
if from_interface == None:
RNS.log("Blocking announce broadcast on "+str(interface)+" since next hop interface doesn't exist", RNS.LOG_EXTREME)
elif not hasattr(from_interface, "mode"):
RNS.log("Blocking announce broadcast on "+str(interface)+" since next hop interface has no mode configured", RNS.LOG_EXTREME)
else:
if from_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
RNS.log("Blocking announce broadcast on "+str(interface)+" due to roaming-mode next-hop interface", RNS.LOG_EXTREME)
should_transmit = False
elif from_interface.mode == RNS.Interfaces.Interface.Interface.MODE_BOUNDARY:
RNS.log("Blocking announce broadcast on "+str(interface)+" due to boundary-mode next-hop interface", RNS.LOG_EXTREME)
should_transmit = False
elif interface.mode == RNS.Interfaces.Interface.Interface.MODE_BOUNDARY:
local_destination = next((d for d in Transport.destinations if d.hash == packet.destination_hash), None)
if local_destination != None:
# RNS.log("Allowing announce broadcast on boundary-mode interface from instance-local destination", RNS.LOG_EXTREME)
pass
else:
from_interface = Transport.next_hop_interface(packet.destination_hash)
if from_interface == None or not hasattr(from_interface, "mode"):
should_transmit = False
if from_interface == None:
RNS.log("Blocking announce broadcast on "+str(interface)+" since next hop interface doesn't exist", RNS.LOG_EXTREME)
elif not hasattr(from_interface, "mode"):
RNS.log("Blocking announce broadcast on "+str(interface)+" since next hop interface has no mode configured", RNS.LOG_EXTREME)
else:
if from_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
RNS.log("Blocking announce broadcast on "+str(interface)+" due to roaming-mode next-hop interface", RNS.LOG_EXTREME)
should_transmit = False
else:
# Currently, annouces originating locally are always
# allowed, and do not conform to bandwidth caps.
# TODO: Rethink whether this is actually optimal.
if packet.hops > 0:
if not hasattr(interface, "announce_cap"):
interface.announce_cap = RNS.Reticulum.ANNOUNCE_CAP
if not hasattr(interface, "announce_allowed_at"):
interface.announce_allowed_at = 0
if not hasattr(interface, "announce_queue"):
interface.announce_queue = []
queued_announces = True if len(interface.announce_queue) > 0 else False
if not queued_announces and outbound_time > interface.announce_allowed_at:
tx_time = (len(packet.raw)*8) / interface.bitrate
wait_time = (tx_time / interface.announce_cap)
interface.announce_allowed_at = outbound_time + wait_time
else:
should_transmit = False
if not len(interface.announce_queue) >= RNS.Reticulum.MAX_QUEUED_ANNOUNCES:
should_queue = True
already_queued = False
for e in interface.announce_queue:
if e["destination"] == packet.destination_hash:
already_queued = True
existing_entry = e
emission_timestamp = Transport.announce_emitted(packet)
if already_queued:
should_queue = False
if emission_timestamp > existing_entry["emitted"]:
e["time"] = outbound_time
e["hops"] = packet.hops
e["emitted"] = emission_timestamp
e["raw"] = packet.raw
if should_queue:
entry = {
"destination": packet.destination_hash,
"time": outbound_time,
"hops": packet.hops,
"emitted": Transport.announce_emitted(packet),
"raw": packet.raw
}
queued_announces = True if len(interface.announce_queue) > 0 else False
interface.announce_queue.append(entry)
if not queued_announces:
wait_time = max(interface.announce_allowed_at - time.time(), 0)
timer = threading.Timer(wait_time, interface.process_announce_queue)
timer.start()
if wait_time < 1:
wait_time_str = str(round(wait_time*1000,2))+"ms"
else:
wait_time_str = str(round(wait_time*1,2))+"s"
ql_str = str(len(interface.announce_queue))
RNS.log("Added announce to queue (height "+ql_str+") on "+str(interface)+" for processing in "+wait_time_str, RNS.LOG_EXTREME)
else:
wait_time = max(interface.announce_allowed_at - time.time(), 0)
if wait_time < 1:
wait_time_str = str(round(wait_time*1000,2))+"ms"
else:
wait_time_str = str(round(wait_time*1,2))+"s"
ql_str = str(len(interface.announce_queue))
RNS.log("Added announce to queue (height "+ql_str+") on "+str(interface)+" for processing in "+wait_time_str, RNS.LOG_EXTREME)
else:
pass
else:
pass
if should_transmit:
if not stored_hash:
Transport.packet_hashlist.append(packet.packet_hash)
stored_hash = True
# TODO: Re-evaluate potential for blocking
# def send_packet():
# Transport.transmit(interface, packet.raw)
# thread = threading.Thread(target=send_packet)
# thread.daemon = True
# thread.start()
Transport.transmit(interface, packet.raw)
if packet.packet_type == RNS.Packet.ANNOUNCE:
interface.sent_announce()
packet_sent(packet)
sent = True
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.context == RNS.Packet.CHANNEL:
return True
if packet.destination_type == RNS.Destination.PLAIN:
if packet.packet_type != RNS.Packet.ANNOUNCE:
if packet.hops > 1:
RNS.log("Dropped PLAIN packet "+RNS.prettyhexrep(packet.hash)+" with "+str(packet.hops)+" hops", RNS.LOG_DEBUG)
return False
else:
return True
else:
RNS.log("Dropped invalid PLAIN announce packet", RNS.LOG_DEBUG)
return False
if packet.destination_type == RNS.Destination.GROUP:
if packet.packet_type != RNS.Packet.ANNOUNCE:
if packet.hops > 1:
RNS.log("Dropped GROUP packet "+RNS.prettyhexrep(packet.hash)+" with "+str(packet.hops)+" hops", RNS.LOG_DEBUG)
return False
else:
return True
else:
RNS.log("Dropped invalid GROUP announce packet", RNS.LOG_DEBUG)
return False
if not packet.packet_hash in Transport.packet_hashlist:
return True
else:
if packet.packet_type == RNS.Packet.ANNOUNCE:
if packet.destination_type == RNS.Destination.SINGLE:
return True
else:
RNS.log("Dropped invalid announce packet", RNS.LOG_DEBUG)
return False
RNS.log("Filtered packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
return False
@staticmethod
def inbound(raw, interface=None):
# If interface access codes are enabled,
# we must authenticate each packet.
if len(raw) > 2:
if interface != None and hasattr(interface, "ifac_identity") and interface.ifac_identity != None:
# Check that IFAC flag is set
if raw[0] & 0x80 == 0x80:
if len(raw) > 2+interface.ifac_size:
# Extract IFAC
ifac = raw[2:2+interface.ifac_size]
# Generate mask
mask = RNS.Cryptography.hkdf(
length=len(raw),
derive_from=ifac,
salt=interface.ifac_key,
context=None,
)
# Unmask payload
i = 0; unmasked_raw = b""
for byte in raw:
if i <= 1 or i > interface.ifac_size+1:
# Unmask header bytes and payload
unmasked_raw += bytes([byte ^ mask[i]])
else:
# Don't unmask IFAC itself
unmasked_raw += bytes([byte])
i += 1
raw = unmasked_raw
# Unset IFAC flag
new_header = bytes([raw[0] & 0x7f, raw[1]])
# Re-assemble packet
new_raw = new_header+raw[2+interface.ifac_size:]
# Calculate expected IFAC
expected_ifac = interface.ifac_identity.sign(new_raw)[-interface.ifac_size:]
# Check it
if ifac == expected_ifac:
raw = new_raw
else:
return
else:
return
else:
# If the IFAC flag is not set, but should be,
# drop the packet.
return
else:
# If the interface does not have IFAC enabled,
# check the received packet IFAC flag.
if raw[0] & 0x80 == 0x80:
# If the flag is set, drop the packet
return
else:
return
while (Transport.jobs_running):
sleep(0.0005)
if Transport.identity == None:
return
Transport.jobs_locked = True
packet = RNS.Packet(None, raw)
if not packet.unpack():
Transport.jobs_locked = False
return
packet.receiving_interface = interface
packet.hops += 1
if interface != None:
if hasattr(interface, "r_stat_rssi"):
if interface.r_stat_rssi != None:
packet.rssi = interface.r_stat_rssi
if len(Transport.local_client_interfaces) > 0:
Transport.local_client_rssi_cache.append([packet.packet_hash, packet.rssi])
while len(Transport.local_client_rssi_cache) > Transport.LOCAL_CLIENT_CACHE_MAXSIZE:
Transport.local_client_rssi_cache.pop(0)
if hasattr(interface, "r_stat_snr"):
if interface.r_stat_rssi != None:
packet.snr = interface.r_stat_snr
if len(Transport.local_client_interfaces) > 0:
Transport.local_client_snr_cache.append([packet.packet_hash, packet.snr])
while len(Transport.local_client_snr_cache) > Transport.LOCAL_CLIENT_CACHE_MAXSIZE:
Transport.local_client_snr_cache.pop(0)
if hasattr(interface, "r_stat_q"):
if interface.r_stat_q != None:
packet.q = interface.r_stat_q
if len(Transport.local_client_interfaces) > 0:
Transport.local_client_q_cache.append([packet.packet_hash, packet.q])
while len(Transport.local_client_q_cache) > Transport.LOCAL_CLIENT_CACHE_MAXSIZE:
Transport.local_client_q_cache.pop(0)
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:
Transport.transmit(interface, 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:
Transport.transmit(interface, 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):
Transport.jobs_locked = False
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[(RNS.Identity.TRUNCATED_HASHLENGTH//8)+2:]
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[(RNS.Identity.TRUNCATED_HASHLENGTH//8)+2:]
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]
if packet.packet_type == RNS.Packet.LINKREQUEST:
now = time.time()
proof_timeout = Transport.extra_link_proof_timeout(packet.receiving_interface)
proof_timeout += now + RNS.Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, remaining_hops)
# Entry format is
link_entry = [ now, # 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
proof_timeout] # 8: Proof timeout timestamp
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
Transport.transmit(outbound_interface, new_raw)
Transport.destination_table[packet.destination_hash][0] = time.time()
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_EXTREME)
# 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:]
Transport.transmit(outbound_interface, 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:
if interface != None and RNS.Identity.validate_announce(packet, only_validate_signature=True):
interface.received_announce()
if not packet.destination_hash in Transport.destination_table:
# This is an unknown destination, and we'll apply
# potential ingress limiting. Already known
# destinations will have re-announces controlled
# by normal announce rate limiting.
if interface.should_ingress_limit():
interface.hold_announce(packet)
Transport.jobs_locked = False
return
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 another 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):
announce_emitted = Transport.announce_emitted(packet)
random_blob = packet.data[RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8+10]
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:
Transport.mark_path_unknown_state(packet.destination_hash)
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 the path has expired, consider this
# announce for adding to the path table.
if (now >= path_expires):
# We check that the announce 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)
Transport.mark_path_unknown_state(packet.destination_hash)
should_add = True
else:
should_add = False
else:
# If the path is not expired, but the emission
# is more recent, and we haven't already heard
# this announce before, update the path table.
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)
Transport.mark_path_unknown_state(packet.destination_hash)
should_add = True
else:
should_add = False
# If we have already heard this announce before,
# but the path has been marked as unresponsive
# by a failed communications attempt or similar,
# allow updating the path table to this one.
elif announce_emitted == path_announce_emitted:
if Transport.path_is_unresponsive(packet.destination_hash):
RNS.log("Replacing destination table entry for "+str(RNS.prettyhexrep(packet.destination_hash))+" with new announce, since previously tried path was unresponsive", 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()
rate_blocked = False
if packet.context != RNS.Packet.PATH_RESPONSE and packet.receiving_interface.announce_rate_target != None:
if not packet.destination_hash in Transport.announce_rate_table:
rate_entry = { "last": now, "rate_violations": 0, "blocked_until": 0, "timestamps": [now]}
Transport.announce_rate_table[packet.destination_hash] = rate_entry
else:
rate_entry = Transport.announce_rate_table[packet.destination_hash]
rate_entry["timestamps"].append(now)
while len(rate_entry["timestamps"]) > Transport.MAX_RATE_TIMESTAMPS:
rate_entry["timestamps"].pop(0)
current_rate = now - rate_entry["last"]
if now > rate_entry["blocked_until"]:
if current_rate < packet.receiving_interface.announce_rate_target:
rate_entry["rate_violations"] += 1
else:
rate_entry["rate_violations"] = max(0, rate_entry["rate_violations"]-1)
if rate_entry["rate_violations"] > packet.receiving_interface.announce_rate_grace:
rate_target = packet.receiving_interface.announce_rate_target
rate_penalty = packet.receiving_interface.announce_rate_penalty
rate_entry["blocked_until"] = rate_entry["last"] + rate_target + rate_penalty
rate_blocked = True
else:
rate_entry["last"] = now
else:
rate_blocked = True
retries = 0
announce_hops = packet.hops
local_rebroadcasts = 0
block_rebroadcasts = False
attached_interface = None
retransmit_timeout = now + (RNS.rand() * Transport.PATHFINDER_RW)
if hasattr(packet.receiving_interface, "mode") and packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT:
expires = now + Transport.AP_PATH_TIME
elif hasattr(packet.receiving_interface, "mode") and packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
expires = now + Transport.ROAMING_PATH_TIME
else:
expires = now + Transport.PATHFINDER_E
random_blobs.append(random_blob)
if (RNS.Reticulum.transport_enabled() or Transport.from_local_client(packet)) and packet.context != RNS.Packet.PATH_RESPONSE:
# Insert announce into announce table for retransmission
if rate_blocked:
RNS.log("Blocking rebroadcast of announce from "+RNS.prettyhexrep(packet.destination_hash)+" due to excessive announce rate", RNS.LOG_DEBUG)
else:
if Transport.from_local_client(packet):
# If the announce is from a local client,
# it is announced immediately, but only one time.
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
]
# TODO: Check from_local_client once and store result
elif Transport.from_local_client(packet) and packet.context == RNS.Packet.PATH_RESPONSE:
# If this is a path response from a local client,
# check if any external interfaces have pending
# path requests.
if packet.destination_hash in Transport.pending_local_path_requests:
desiring_interface = Transport.pending_local_path_requests.pop(packet.destination_hash)
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
# TODO: Shouldn't the context be PATH_RESPONSE in the first case here?
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()
# If we have any waiting discovery path requests
# for this destination, we retransmit to that
# interface immediately
if packet.destination_hash in Transport.discovery_path_requests:
pr_entry = Transport.discovery_path_requests[packet.destination_hash]
attached_interface = pr_entry["requesting_interface"]
interface_str = " on "+str(attached_interface)
RNS.log("Got matching announce, answering waiting discovery path request for "+RNS.prettyhexrep(packet.destination_hash)+interface_str, RNS.LOG_DEBUG)
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
new_announce = RNS.Packet(
announce_destination,
announce_data,
RNS.Packet.ANNOUNCE,
context = RNS.Packet.PATH_RESPONSE,
header_type = RNS.Packet.HEADER_2,
transport_type = Transport.TRANSPORT,
transport_id = Transport.identity.hash,
attached_interface = attached_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("Destination "+RNS.prettyhexrep(packet.destination_hash)+" is now "+str(announce_hops)+" hops away via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_DEBUG)
# 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_DEBUG)
# 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
announce_identity = RNS.Identity.recall(packet.destination_hash)
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:
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 link requests to local destinations
elif packet.packet_type == RNS.Packet.LINKREQUEST:
if packet.transport_id == None or packet.transport_id == Transport.identity.hash:
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:
try:
if destination.callbacks.proof_requested(packet):
packet.prove()
except Exception as e:
RNS.log("Error while executing proof request callback. The contained exception was: "+str(e), RNS.LOG_ERROR)
# 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.hops == link_entry[3]:
if packet.receiving_interface == link_entry[2]:
try:
if len(packet.data) == RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2:
peer_pub_bytes = packet.data[RNS.Identity.SIGLENGTH//8:RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2]
peer_identity = RNS.Identity.recall(link_entry[6])
peer_sig_pub_bytes = peer_identity.get_public_key()[RNS.Link.ECPUBSIZE//2:RNS.Link.ECPUBSIZE]
signed_data = packet.destination_hash+peer_pub_bytes+peer_sig_pub_bytes
signature = packet.data[:RNS.Identity.SIGLENGTH//8]
if peer_identity.validate(signature, signed_data):
RNS.log("Link request proof validated for transport via "+str(link_entry[4]), RNS.LOG_EXTREME)
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
Transport.transmit(link_entry[4], new_raw)
else:
RNS.log("Invalid link request proof in transport for link "+RNS.prettyhexrep(packet.destination_hash)+", dropping proof.", RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Error while transporting link request proof. The contained exception was: "+str(e), RNS.LOG_ERROR)
else:
RNS.log("Link request proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
else:
RNS.log("Received link request proof with hop mismatch, 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_EXTREME)
new_raw = packet.raw[0:1]
new_raw += struct.pack("!B", packet.hops)
new_raw += packet.raw[2:]
Transport.transmit(reverse_entry[0], 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:
# 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_EXTREME)
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_EXTREME)
if link in Transport.pending_links:
if link.status != RNS.Link.ACTIVE:
raise IOError("Invalid link state for link activation: "+str(link.status))
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):
# TODO: Rework the caching system. It's currently
# not very useful to even cache Resource proofs,
# disabling it for now, until redesigned.
# 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. The contained exception was: "+str(e), RNS.LOG_ERROR)
@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 next_hop_interface_bitrate(destination_hash):
next_hop_interface = Transport.next_hop_interface(destination_hash)
if next_hop_interface != None:
return next_hop_interface.bitrate
else:
return None
@staticmethod
def next_hop_per_bit_latency(destination_hash):
next_hop_interface_bitrate = Transport.next_hop_interface_bitrate(destination_hash)
if next_hop_interface_bitrate != None:
return (1/next_hop_interface_bitrate)
else:
return None
@staticmethod
def next_hop_per_byte_latency(destination_hash):
per_bit_latency = Transport.next_hop_per_bit_latency(destination_hash)
if per_bit_latency != None:
return per_bit_latency*8
else:
return None
@staticmethod
def first_hop_timeout(destination_hash):
latency = Transport.next_hop_per_byte_latency(destination_hash)
if latency != None:
return RNS.Reticulum.MTU * latency + RNS.Reticulum.DEFAULT_PER_HOP_TIMEOUT
else:
return RNS.Reticulum.DEFAULT_PER_HOP_TIMEOUT
@staticmethod
def extra_link_proof_timeout(interface):
if interface != None:
return ((1/interface.bitrate)*8)*RNS.Reticulum.MTU
else:
return 0
@staticmethod
def expire_path(destination_hash):
if destination_hash in Transport.destination_table:
Transport.destination_table[destination_hash][0] = 0
Transport.tables_last_culled = 0
return True
else:
return False
@staticmethod
def mark_path_unresponsive(destination_hash):
if destination_hash in Transport.destination_table:
Transport.path_states[destination_hash] = Transport.STATE_UNRESPONSIVE
return True
else:
return False
@staticmethod
def mark_path_responsive(destination_hash):
if destination_hash in Transport.destination_table:
Transport.path_states[destination_hash] = Transport.STATE_RESPONSIVE
return True
else:
return False
@staticmethod
def mark_path_unknown_state(destination_hash):
if destination_hash in Transport.destination_table:
Transport.path_states[destination_hash] = Transport.STATE_UNKNOWN
return True
else:
return False
def path_is_unresponsive(destination_hash):
if destination_hash in Transport.path_states:
if Transport.path_states[destination_hash] == Transport.STATE_UNRESPONSIVE:
return True
return False
@staticmethod
def request_path(destination_hash, on_interface=None, tag=None, recursive=False):
"""
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*.
:param on_interface: If specified, the path request will only be sent on this interface. In normal use, Reticulum handles this automatically, and this parameter should not be used.
"""
if tag == None:
request_tag = RNS.Identity.get_random_hash()
else:
request_tag = tag
if RNS.Reticulum.transport_enabled():
path_request_data = destination_hash+Transport.identity.hash+request_tag
else:
path_request_data = destination_hash+request_tag
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 = on_interface)
if on_interface != None and recursive:
if not hasattr(on_interface, "announce_cap"):
on_interface.announce_cap = RNS.Reticulum.ANNOUNCE_CAP
if not hasattr(on_interface, "announce_allowed_at"):
on_interface.announce_allowed_at = 0
if not hasattr(on_interface, "announce_queue"):
on_interface.announce_queue = []
queued_announces = True if len(on_interface.announce_queue) > 0 else False
if queued_announces:
RNS.log("Blocking recursive path request on "+str(on_interface)+" due to queued announces", RNS.LOG_EXTREME)
return
else:
now = time.time()
if now < on_interface.announce_allowed_at:
RNS.log("Blocking recursive path request on "+str(on_interface)+" due to active announce cap", RNS.LOG_EXTREME)
return
else:
tx_time = ((len(path_request_data)+RNS.Reticulum.HEADER_MINSIZE)*8) / on_interface.bitrate
wait_time = (tx_time / on_interface.announce_cap)
on_interface.announce_allowed_at = now + wait_time
packet.send()
Transport.path_requests[destination_hash] = time.time()
@staticmethod
def path_request_handler(data, packet):
try:
# If there is at least bytes enough for a destination
# hash in the packet, we assume those bytes are the
# destination being requested.
if len(data) >= RNS.Identity.TRUNCATED_HASHLENGTH//8:
destination_hash = data[:RNS.Identity.TRUNCATED_HASHLENGTH//8]
# If there is also enough bytes for a transport
# instance ID and at least one tag byte, we
# assume the next bytes to be the trasport ID
# of the requesting transport instance.
if len(data) > (RNS.Identity.TRUNCATED_HASHLENGTH//8)*2:
requesting_transport_instance = data[RNS.Identity.TRUNCATED_HASHLENGTH//8:(RNS.Identity.TRUNCATED_HASHLENGTH//8)*2]
else:
requesting_transport_instance = None
tag_bytes = None
if len(data) > (RNS.Identity.TRUNCATED_HASHLENGTH//8)*2:
tag_bytes = data[RNS.Identity.TRUNCATED_HASHLENGTH//8*2:]
elif len(data) > (RNS.Identity.TRUNCATED_HASHLENGTH//8):
tag_bytes = data[RNS.Identity.TRUNCATED_HASHLENGTH//8:]
if tag_bytes != None:
if len(tag_bytes) > RNS.Identity.TRUNCATED_HASHLENGTH//8:
tag_bytes = tag_bytes[:RNS.Identity.TRUNCATED_HASHLENGTH//8]
unique_tag = destination_hash+tag_bytes
if not unique_tag in Transport.discovery_pr_tags:
Transport.discovery_pr_tags.append(unique_tag)
Transport.path_request(
destination_hash,
Transport.from_local_client(packet),
packet.receiving_interface,
requestor_transport_id = requesting_transport_instance,
tag=tag_bytes
)
else:
RNS.log("Ignoring duplicate path request for "+RNS.prettyhexrep(destination_hash)+" with tag "+RNS.prettyhexrep(unique_tag), RNS.LOG_DEBUG)
else:
RNS.log("Ignoring tagless path request for "+RNS.prettyhexrep(destination_hash), RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Error while handling path request. The contained exception was: "+str(e), RNS.LOG_ERROR)
@staticmethod
def path_request(destination_hash, is_from_local_client, attached_interface, requestor_transport_id=None, tag=None):
should_search_for_unknown = False
if attached_interface != None:
if RNS.Reticulum.transport_enabled() and attached_interface.mode in RNS.Interfaces.Interface.Interface.DISCOVER_PATHS_FOR:
should_search_for_unknown = True
interface_str = " on "+str(attached_interface)
else:
interface_str = ""
RNS.log("Path request for "+RNS.prettyhexrep(destination_hash)+interface_str, RNS.LOG_DEBUG)
destination_exists_on_local_client = False
if len(Transport.local_client_interfaces) > 0:
if destination_hash in Transport.destination_table:
destination_interface = Transport.destination_table[destination_hash][5]
if Transport.is_local_client_interface(destination_interface):
destination_exists_on_local_client = True
Transport.pending_local_path_requests[destination_hash] = attached_interface
local_destination = next((d for d in Transport.destinations if d.hash == destination_hash), None)
if local_destination != None:
local_destination.announce(path_response=True, tag=tag, attached_interface=attached_interface)
RNS.log("Answering path request for "+RNS.prettyhexrep(destination_hash)+interface_str+", destination is local to this system", RNS.LOG_DEBUG)
elif (RNS.Reticulum.transport_enabled() or is_from_local_client) and (destination_hash in Transport.destination_table):
packet = Transport.destination_table[destination_hash][6]
next_hop = Transport.destination_table[destination_hash][1]
received_from = Transport.destination_table[destination_hash][5]
if attached_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING and attached_interface == received_from:
RNS.log("Not answering path request on roaming-mode interface, since next hop is on same roaming-mode interface", RNS.LOG_DEBUG)
else:
if requestor_transport_id != None and next_hop == requestor_transport_id:
# TODO: Find a bandwidth efficient way to invalidate our
# known path on this signal. The obvious way of signing
# path requests with transport instance keys is quite
# inefficient. There is probably a better way. Doing
# path invalidation here would decrease the network
# convergence time. Maybe just drop it?
RNS.log("Not answering path request for "+RNS.prettyhexrep(destination_hash)+interface_str+", since next hop is the requestor", RNS.LOG_DEBUG)
else:
RNS.log("Answering path request for "+RNS.prettyhexrep(destination_hash)+interface_str+", path is known", RNS.LOG_DEBUG)
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
RNS.log("Forwarding path request from local client for "+RNS.prettyhexrep(destination_hash)+interface_str+" to all other interfaces", RNS.LOG_DEBUG)
request_tag = RNS.Identity.get_random_hash()
for interface in Transport.interfaces:
if not interface == attached_interface:
Transport.request_path(destination_hash, interface, tag = request_tag)
elif should_search_for_unknown:
if destination_hash in Transport.discovery_path_requests:
RNS.log("There is already a waiting path request for "+RNS.prettyhexrep(destination_hash)+" on behalf of path request"+interface_str, RNS.LOG_DEBUG)
else:
# Forward path request on all interfaces
# except the requestor interface
RNS.log("Attempting to discover unknown path to "+RNS.prettyhexrep(destination_hash)+" on behalf of path request"+interface_str, RNS.LOG_DEBUG)
pr_entry = { "destination_hash": destination_hash, "timeout": time.time()+Transport.PATH_REQUEST_TIMEOUT, "requesting_interface": attached_interface }
Transport.discovery_path_requests[destination_hash] = pr_entry
for interface in Transport.interfaces:
if not interface == attached_interface:
# Use the previously extracted tag from this path request
# on the new path requests as well, to avoid potential loops
Transport.request_path(destination_hash, on_interface=interface, tag=tag, recursive=True)
elif not is_from_local_client and len(Transport.local_client_interfaces) > 0:
# Forward the path request on all local
# client interfaces
RNS.log("Forwarding path request for "+RNS.prettyhexrep(destination_hash)+interface_str+" to local clients", RNS.LOG_DEBUG)
for interface in Transport.local_client_interfaces:
Transport.request_path(destination_hash, on_interface=interface)
else:
RNS.log("Ignoring path request for "+RNS.prettyhexrep(destination_hash)+interface_str+", no path known", 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():
detachable_interfaces = []
for interface in Transport.interfaces:
# Currently no rules are being applied
# here, and all interfaces will be sent
# the detach call on RNS teardown.
if True:
detachable_interfaces.append(interface)
else:
pass
for interface in Transport.local_client_interfaces:
# Currently no rules are being applied
# here, and all interfaces will be sent
# the detach call on RNS teardown.
if True:
detachable_interfaces.append(interface)
else:
pass
for interface in detachable_interfaces:
try:
interface.detach()
except Exception as e:
RNS.log("An error occurred while detaching "+str(interface)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
@staticmethod
def shared_connection_disappeared():
for link in Transport.active_links:
link.teardown()
for link in Transport.pending_links:
link.teardown()
Transport.announce_table = {}
Transport.destination_table = {}
Transport.reverse_table = {}
Transport.link_table = {}
Transport.held_announces = {}
Transport.announce_handlers = []
Transport.tunnels = {}
@staticmethod
def shared_connection_reappeared():
if Transport.owner.is_connected_to_shared_instance:
for registered_destination in Transport.destinations:
if registered_destination.type == RNS.Destination.SINGLE:
registered_destination.announce(path_response=True)
@staticmethod
def drop_announce_queues():
for interface in Transport.interfaces:
if hasattr(interface, "announce_queue") and interface.announce_queue != None:
na = len(interface.announce_queue)
if na > 0:
if na == 1:
na_str = "1 announce"
else:
na_str = str(na)+" announces"
interface.announce_queue = []
RNS.log("Dropped "+na_str+" on "+str(interface), RNS.LOG_VERBOSE)
@staticmethod
def announce_emitted(packet):
random_blob = packet.data[RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8+10]
announce_emitted = int.from_bytes(random_blob[5:10], "big")
return announce_emitted
@staticmethod
def save_packet_hashlist():
if not Transport.owner.is_connected_to_shared_instance:
if hasattr(Transport, "saving_packet_hashlist"):
wait_interval = 0.2
wait_timeout = 5
wait_start = time.time()
while Transport.saving_packet_hashlist:
time.sleep(wait_interval)
if time.time() > wait_start+wait_timeout:
RNS.log("Could not save packet hashlist to storage, waiting for previous save operation timed out.", RNS.LOG_ERROR)
return False
try:
Transport.saving_packet_hashlist = True
save_start = time.time()
if not RNS.Reticulum.transport_enabled():
Transport.packet_hashlist = []
else:
RNS.log("Saving packet hashlist to storage...", RNS.LOG_DEBUG)
packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
file = open(packet_hashlist_path, "wb")
file.write(umsgpack.packb(Transport.packet_hashlist))
file.close()
save_time = time.time() - save_start
if save_time < 1:
time_str = str(round(save_time*1000,2))+"ms"
else:
time_str = str(round(save_time,2))+"s"
RNS.log("Saved packet hashlist in "+time_str, RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Could not save packet hashlist to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
Transport.saving_packet_hashlist = False
@staticmethod
def save_path_table():
if not Transport.owner.is_connected_to_shared_instance:
if hasattr(Transport, "saving_path_table"):
wait_interval = 0.2
wait_timeout = 5
wait_start = time.time()
while Transport.saving_path_table:
time.sleep(wait_interval)
if time.time() > wait_start+wait_timeout:
RNS.log("Could not save path table to storage, waiting for previous save operation timed out.", RNS.LOG_ERROR)
return False
try:
Transport.saving_path_table = True
save_start = time.time()
RNS.log("Saving path table to storage...", RNS.LOG_DEBUG)
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()
save_time = time.time() - save_start
if save_time < 1:
time_str = str(round(save_time*1000,2))+"ms"
else:
time_str = str(round(save_time,2))+"s"
RNS.log("Saved "+str(len(serialised_destinations))+" path table entries in "+time_str, RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Could not save path table to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
Transport.saving_path_table = False
@staticmethod
def save_tunnel_table():
if not Transport.owner.is_connected_to_shared_instance:
if hasattr(Transport, "saving_tunnel_table"):
wait_interval = 0.2
wait_timeout = 5
wait_start = time.time()
while Transport.saving_tunnel_table:
time.sleep(wait_interval)
if time.time() > wait_start+wait_timeout:
RNS.log("Could not save tunnel table to storage, waiting for previous save operation timed out.", RNS.LOG_ERROR)
return False
try:
Transport.saving_tunnel_table = True
save_start = time.time()
RNS.log("Saving tunnel table to storage...", RNS.LOG_DEBUG)
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()
save_time = time.time() - save_start
if save_time < 1:
time_str = str(round(save_time*1000,2))+"ms"
else:
time_str = str(round(save_time,2))+"s"
RNS.log("Saved "+str(len(serialised_tunnels))+" tunnel table entries in "+time_str, RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Could not save tunnel table to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
Transport.saving_tunnel_table = False
@staticmethod
def persist_data():
Transport.save_packet_hashlist()
Transport.save_path_table()
Transport.save_tunnel_table()
@staticmethod
def exit_handler():
if not Transport.owner.is_connected_to_shared_instance:
Transport.persist_data()
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