1132 lines
60 KiB
Python
Executable File
1132 lines
60 KiB
Python
Executable File
import os
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import RNS
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import time
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import math
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import struct
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import threading
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import traceback
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from time import sleep
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from .vendor import umsgpack as umsgpack
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class Transport:
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# Constants
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BROADCAST = 0x00;
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TRANSPORT = 0x01;
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RELAY = 0x02;
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TUNNEL = 0x03;
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types = [BROADCAST, TRANSPORT, RELAY, TUNNEL]
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REACHABILITY_UNREACHABLE = 0x00
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REACHABILITY_DIRECT = 0x01
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REACHABILITY_TRANSPORT = 0x02
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APP_NAME = "rnstransport"
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# TODO: Document the addition of random windows
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# and max local rebroadcasts.
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PATHFINDER_M = 18 # Max hops
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PATHFINDER_C = 2.0 # Decay constant
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PATHFINDER_R = 1 # Retransmit retries
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PATHFINDER_T = 10 # Retry grace period
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PATHFINDER_RW = 10 # Random window for announce rebroadcast
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PATHFINDER_E = 60*15 # Path expiration in seconds
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# TODO: Calculate an optimal number for this in
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# various situations
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LOCAL_REBROADCASTS_MAX = 2 # How many local rebroadcasts of an announce is allowed
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PATH_REQUEST_GRACE = 0.35 # Grace time before a path announcement is made, allows directly reachable peers to respond first
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PATH_REQUEST_RW = 2 # Path request random window
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LINK_TIMEOUT = RNS.Link.KEEPALIVE * 2
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REVERSE_TIMEOUT = 30*60 # Reverse table entries are removed after max 30 minutes
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DESTINATION_TIMEOUT = 60*60*24*7 # Destination table entries are removed if unused for one week
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MAX_RECEIPTS = 1024 # Maximum number of receipts to keep track of
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interfaces = [] # All active interfaces
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destinations = [] # All active destinations
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pending_links = [] # Links that are being established
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active_links = [] # Links that are active
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packet_hashlist = [] # A list of packet hashes for duplicate detection
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receipts = [] # Receipts of all outgoing packets for proof processing
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# TODO: "destination_table" should really be renamed to "path_table"
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announce_table = {} # A table for storing announces currently waiting to be retransmitted
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destination_table = {} # A lookup table containing the next hop to a given destination
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reverse_table = {} # A lookup table for storing packet hashes used to return proofs and replies
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link_table = {} # A lookup table containing hops for links
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held_announces = {} # A table containing temporarily held announce-table entries
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# Transport control destinations are used
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# for control purposes like path requests
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control_destinations = []
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control_hashes = []
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# Interfaces for communicating with
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# local clients connected to a shared
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# Reticulum instance
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local_client_interfaces = []
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jobs_locked = False
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jobs_running = False
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job_interval = 0.250
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receipts_last_checked = 0.0
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receipts_check_interval = 1.0
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announces_last_checked = 0.0
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announces_check_interval = 1.0
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hashlist_maxsize = 1000000
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tables_last_culled = 0.0
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tables_cull_interval = 5.0
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identity = None
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@staticmethod
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def start(reticulum_instance):
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Transport.owner = reticulum_instance
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if Transport.identity == None:
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transport_identity_path = RNS.Reticulum.storagepath+"/transport_identity"
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if os.path.isfile(transport_identity_path):
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Transport.identity = RNS.Identity.from_file(transport_identity_path)
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if Transport.identity == None:
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RNS.log("No valid Transport Identity in storage, creating...", RNS.LOG_VERBOSE)
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Transport.identity = RNS.Identity()
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Transport.identity.save(transport_identity_path)
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else:
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RNS.log("Loaded Transport Identity from storage", RNS.LOG_VERBOSE)
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packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
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if os.path.isfile(packet_hashlist_path):
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try:
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file = open(packet_hashlist_path, "rb")
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Transport.packet_hashlist = umsgpack.unpackb(file.read())
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file.close()
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except Exception as e:
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RNS.log("Could not load packet hashlist from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
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# Create transport-specific destinations
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Transport.path_request_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
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Transport.path_request_destination.packet_callback(Transport.path_request_handler)
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Transport.control_destinations.append(Transport.path_request_destination)
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Transport.control_hashes.append(Transport.path_request_destination.hash)
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thread = threading.Thread(target=Transport.jobloop)
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thread.setDaemon(True)
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thread.start()
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if RNS.Reticulum.transport_enabled():
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destination_table_path = RNS.Reticulum.storagepath+"/destination_table"
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if os.path.isfile(destination_table_path) and not Transport.owner.is_connected_to_shared_instance:
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serialised_destinations = []
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try:
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file = open(destination_table_path, "rb")
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serialised_destinations = umsgpack.unpackb(file.read())
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file.close()
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for serialised_entry in serialised_destinations:
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destination_hash = serialised_entry[0]
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timestamp = serialised_entry[1]
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received_from = serialised_entry[2]
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hops = serialised_entry[3]
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expires = serialised_entry[4]
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random_blobs = serialised_entry[5]
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receiving_interface = Transport.find_interface_from_hash(serialised_entry[6])
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announce_packet = Transport.get_cached_packet(serialised_entry[7])
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if announce_packet != None and receiving_interface != None:
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announce_packet.unpack()
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# We increase the hops, since reading a packet
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# from cache is equivalent to receiving it again
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# over an interface. It is cached with it's non-
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# increased hop-count.
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announce_packet.hops += 1
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Transport.destination_table[destination_hash] = [timestamp, received_from, hops, expires, random_blobs, receiving_interface, announce_packet]
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RNS.log("Loaded path table entry for "+RNS.prettyhexrep(destination_hash)+" from storage", RNS.LOG_DEBUG)
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else:
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RNS.log("Could not reconstruct path table entry from storage for "+RNS.prettyhexrep(destination_hash), RNS.LOG_DEBUG)
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if announce_packet == None:
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RNS.log("The announce packet could not be loaded from cache", RNS.LOG_DEBUG)
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if receiving_interface == None:
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RNS.log("The interface is no longer available", RNS.LOG_DEBUG)
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if len(Transport.destination_table) == 1:
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specifier = "entry"
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else:
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specifier = "entries"
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RNS.log("Loaded "+str(len(Transport.destination_table))+" path table "+specifier+" from storage", RNS.LOG_VERBOSE)
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except Exception as e:
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RNS.log("Could not load destination table from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
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RNS.log("Transport instance "+str(Transport.identity)+" started")
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@staticmethod
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def jobloop():
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while (True):
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Transport.jobs()
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sleep(Transport.job_interval)
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@staticmethod
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def jobs():
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outgoing = []
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Transport.jobs_running = True
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try:
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if not Transport.jobs_locked:
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# Process receipts list for timed-out packets
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if time.time() > Transport.receipts_last_checked+Transport.receipts_check_interval:
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while len(Transport.receipts) > Transport.MAX_RECEIPTS:
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culled_receipt = Transport.receipts.pop(0)
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culled_receipt.timeout = -1
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receipt.check_timeout()
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for receipt in Transport.receipts:
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receipt.check_timeout()
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if receipt.status != RNS.PacketReceipt.SENT:
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Transport.receipts.remove(receipt)
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Transport.receipts_last_checked = time.time()
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# Process announces needing retransmission
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if time.time() > Transport.announces_last_checked+Transport.announces_check_interval:
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for destination_hash in Transport.announce_table:
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announce_entry = Transport.announce_table[destination_hash]
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if announce_entry[2] > Transport.PATHFINDER_R:
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RNS.log("Dropping announce for "+RNS.prettyhexrep(destination_hash)+", retries exceeded", RNS.LOG_DEBUG)
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Transport.announce_table.pop(destination_hash)
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break
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else:
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if time.time() > announce_entry[1]:
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announce_entry[1] = time.time() + math.pow(Transport.PATHFINDER_C, announce_entry[4]) + Transport.PATHFINDER_T + Transport.PATHFINDER_RW
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announce_entry[2] += 1
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packet = announce_entry[5]
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block_rebroadcasts = announce_entry[7]
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attached_interface = announce_entry[8]
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announce_context = RNS.Packet.NONE
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if block_rebroadcasts:
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announce_context = RNS.Packet.PATH_RESPONSE
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announce_data = packet.data
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announce_identity = RNS.Identity.recall(packet.destination_hash)
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announce_destination = RNS.Destination(announce_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "unknown", "unknown");
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announce_destination.hash = packet.destination_hash
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announce_destination.hexhash = announce_destination.hash.hex()
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new_packet = RNS.Packet(
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announce_destination,
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announce_data,
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RNS.Packet.ANNOUNCE,
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context = announce_context,
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header_type = RNS.Packet.HEADER_2,
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transport_type = Transport.TRANSPORT,
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transport_id = Transport.identity.hash,
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attached_interface = attached_interface
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)
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new_packet.hops = announce_entry[4]
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if block_rebroadcasts:
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RNS.log("Rebroadcasting announce as path response for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
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else:
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RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
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outgoing.append(new_packet)
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# This handles an edge case where a peer sends a past
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# request for a destination just after an announce for
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# said destination has arrived, but before it has been
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# rebroadcast locally. In such a case the actual announce
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# is temporarily held, and then reinserted when the path
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# request has been served to the peer.
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if destination_hash in Transport.held_announces:
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held_entry = Transport.held_announces.pop(destination_hash)
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Transport.announce_table[destination_hash] = held_entry
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RNS.log("Reinserting held announce into table", RNS.LOG_DEBUG)
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Transport.announces_last_checked = time.time()
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# Cull the packet hashlist if it has reached max size
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while (len(Transport.packet_hashlist) > Transport.hashlist_maxsize):
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Transport.packet_hashlist.pop(0)
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if time.time() > Transport.tables_last_culled + Transport.tables_cull_interval:
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# Cull the reverse table according to timeout
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for truncated_packet_hash in Transport.reverse_table:
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reverse_entry = Transport.reverse_table[truncated_packet_hash]
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if time.time() > reverse_entry[2] + Transport.REVERSE_TIMEOUT:
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Transport.reverse_table.pop(truncated_packet_hash)
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# Cull the link table according to timeout
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stale_links = []
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for link_id in Transport.link_table:
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link_entry = Transport.link_table[link_id]
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if time.time() > link_entry[0] + Transport.LINK_TIMEOUT:
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stale_links.append(link_id)
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# Cull the path table
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stale_paths = []
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for destination_hash in Transport.destination_table:
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destination_entry = Transport.destination_table[destination_hash]
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attached_interface = destination_entry[5]
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if time.time() > destination_entry[0] + Transport.DESTINATION_TIMEOUT:
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stale_paths.append(destination_hash)
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RNS.log("Path to "+RNS.prettyhexrep(destination_hash)+" timed out and was removed", RNS.LOG_DEBUG)
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if not attached_interface in Transport.interfaces:
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stale_paths.append(destination_hash)
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RNS.log("Path to "+RNS.prettyhexrep(destination_hash)+" was removed since the attached interface no longer exists", RNS.LOG_DEBUG)
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i = 0
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for link_id in stale_links:
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Transport.link_table.pop(link_id)
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i += 1
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if i > 0:
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if i == 1:
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RNS.log("Dropped "+str(i)+" link", RNS.LOG_DEBUG)
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else:
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RNS.log("Dropped "+str(i)+" links", RNS.LOG_DEBUG)
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i = 0
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for destination_hash in stale_paths:
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Transport.destination_table.pop(destination_hash)
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i += 1
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if i > 0:
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if i == 1:
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RNS.log("Removed "+str(i)+" path", RNS.LOG_DEBUG)
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else:
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RNS.log("Removed "+str(i)+" paths", RNS.LOG_DEBUG)
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Transport.tables_last_culled = time.time()
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except Exception as e:
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RNS.log("An exception occurred while running Transport jobs.", RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
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traceback.print_exc()
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Transport.jobs_running = False
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for packet in outgoing:
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packet.send()
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@staticmethod
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def outbound(packet):
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while (Transport.jobs_running):
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sleep(0.01)
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Transport.jobs_locked = True
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# TODO: This updateHash call might be redundant
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packet.updateHash()
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sent = False
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# Check if we have a known path for the destination in the path table
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if packet.packet_type != RNS.Packet.ANNOUNCE and packet.destination_hash in Transport.destination_table:
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outbound_interface = Transport.destination_table[packet.destination_hash][5]
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# If there's more than one hop to the destination, and we know
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# a path, we insert the packet into transport by adding the next
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# transport nodes address to the header, and modifying the flags.
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# This rule applies both for "normal" transport, and when connected
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# to a local shared Reticulum instance.
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if Transport.destination_table[packet.destination_hash][2] > 1:
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if packet.header_type == RNS.Packet.HEADER_1:
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# Insert packet into transport
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new_flags = (RNS.Packet.HEADER_2) << 6 | (Transport.TRANSPORT) << 4 | (packet.flags & 0b00001111)
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new_raw = struct.pack("!B", new_flags)
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new_raw += packet.raw[1:2]
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new_raw += Transport.destination_table[packet.destination_hash][1]
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new_raw += packet.raw[2:]
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# TODO: Remove at some point
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# RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
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outbound_interface.processOutgoing(new_raw)
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Transport.destination_table[packet.destination_hash][0] = time.time()
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sent = True
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# In the special case where we are connected to a local shared
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# Reticulum instance, and the destination is one hop away, we
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# also add transport headers to inject the packet into transport
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# via the shared instance. Normally a packet for a destination
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# one hop away would just be broadcast directly, but since we
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# are "behind" a shared instance, we need to get that instance
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# to transport it onto the network.
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elif Transport.destination_table[packet.destination_hash][2] == 1 and Transport.owner.is_connected_to_shared_instance:
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if packet.header_type == RNS.Packet.HEADER_1:
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# Insert packet into transport
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new_flags = (RNS.Packet.HEADER_2) << 6 | (Transport.TRANSPORT) << 4 | (packet.flags & 0b00001111)
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new_raw = struct.pack("!B", new_flags)
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new_raw += packet.raw[1:2]
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new_raw += Transport.destination_table[packet.destination_hash][1]
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new_raw += packet.raw[2:]
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# TODO: Remove at some point
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# RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
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outbound_interface.processOutgoing(new_raw)
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Transport.destination_table[packet.destination_hash][0] = time.time()
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sent = True
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# If none of the above applies, we know the destination is
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# directly reachable, and also on which interface, so we
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# simply transmit the packet directly on that one.
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else:
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outbound_interface.processOutgoing(packet.raw)
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sent = True
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# If we don't have a known path for the destination, we'll
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# broadcast the packet on all outgoing interfaces, or the
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# just the relevant interface if the packet has an attached
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# interface, or belongs to a link.
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else:
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for interface in Transport.interfaces:
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if interface.OUT:
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should_transmit = True
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if packet.destination.type == RNS.Destination.LINK:
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if packet.destination.status == RNS.Link.CLOSED:
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should_transmit = False
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if interface != packet.destination.attached_interface:
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should_transmit = False
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if packet.attached_interface != None and interface != packet.attached_interface:
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should_transmit = False
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if should_transmit:
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RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(interface), RNS.LOG_EXTREME)
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RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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interface.processOutgoing(packet.raw)
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sent = True
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if sent:
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packet.sent = True
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packet.sent_at = time.time()
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# Don't generate receipt if it has been explicitly disabled
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if (packet.create_receipt == True and
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# Only generate receipts for DATA packets
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packet.packet_type == RNS.Packet.DATA and
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# Don't generate receipts for PLAIN destinations
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packet.destination.type != RNS.Destination.PLAIN and
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# Don't generate receipts for link-related packets
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not (packet.context >= RNS.Packet.KEEPALIVE and packet.context <= RNS.Packet.LRPROOF) and
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# Don't generate receipts for resource packets
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not (packet.context >= RNS.Packet.RESOURCE and packet.context <= RNS.Packet.RESOURCE_RCL)):
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packet.receipt = RNS.PacketReceipt(packet)
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Transport.receipts.append(packet.receipt)
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Transport.cache(packet)
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Transport.jobs_locked = False
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return sent
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@staticmethod
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def packet_filter(packet):
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# TODO: Think long and hard about this.
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# Is it even strictly necessary with the current
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# transport rules?
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if packet.context == RNS.Packet.KEEPALIVE:
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return True
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if packet.context == RNS.Packet.RESOURCE_REQ:
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return True
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if packet.context == RNS.Packet.RESOURCE_PRF:
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return True
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if packet.context == RNS.Packet.RESOURCE:
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return True
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if packet.context == RNS.Packet.CACHE_REQUEST:
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return True
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if packet.destination_type == RNS.Destination.PLAIN:
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return True
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if not packet.packet_hash in Transport.packet_hashlist:
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return True
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else:
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if packet.packet_type == RNS.Packet.ANNOUNCE:
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return True
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RNS.log("Filtered packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
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return False
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|
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@staticmethod
|
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def inbound(raw, interface=None):
|
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while (Transport.jobs_running):
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sleep(0.1)
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Transport.jobs_locked = True
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|
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packet = RNS.Packet(None, raw)
|
|
packet.unpack()
|
|
packet.receiving_interface = interface
|
|
packet.hops += 1
|
|
|
|
RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
|
|
|
|
if len(Transport.local_client_interfaces) > 0:
|
|
|
|
if Transport.is_local_client_interface(interface):
|
|
packet.hops -= 1
|
|
elif Transport.interface_to_shared_instance(interface):
|
|
packet.hops -= 1
|
|
|
|
|
|
if Transport.packet_filter(packet):
|
|
Transport.packet_hashlist.append(packet.packet_hash)
|
|
Transport.cache(packet)
|
|
|
|
# Check special conditions for local clients connected
|
|
# through a shared Reticulum instance
|
|
from_local_client = (packet.receiving_interface in Transport.local_client_interfaces)
|
|
for_local_client = (packet.packet_type != RNS.Packet.ANNOUNCE) and (packet.destination_hash in Transport.destination_table and Transport.destination_table[packet.destination_hash][2] == 0)
|
|
for_local_client_link = (packet.packet_type != RNS.Packet.ANNOUNCE) and (packet.destination_hash in Transport.link_table and Transport.link_table[packet.destination_hash][4] in Transport.local_client_interfaces)
|
|
for_local_client_link |= (packet.packet_type != RNS.Packet.ANNOUNCE) and (packet.destination_hash in Transport.link_table and Transport.link_table[packet.destination_hash][2] in Transport.local_client_interfaces)
|
|
proof_for_local_client = (packet.destination_hash in Transport.reverse_table) and (Transport.reverse_table[packet.destination_hash][0] in Transport.local_client_interfaces)
|
|
|
|
# Plain broadcast packets from local clients are sent
|
|
# directly on all attached interfaces, since they are
|
|
# never injected into transport.
|
|
if not packet.destination_hash in Transport.control_hashes:
|
|
if packet.destination_type == RNS.Destination.PLAIN and packet.transport_type == Transport.BROADCAST:
|
|
# Send to all interfaces except the originator
|
|
if from_local_client:
|
|
for interface in Transport.interfaces:
|
|
if interface != packet.receiving_interface:
|
|
interface.processOutgoing(packet.raw)
|
|
# If the packet was not from a local client, send
|
|
# it directly to all local clients
|
|
else:
|
|
for interface in Transport.local_client_interfaces:
|
|
interface.processOutgoing(packet.raw)
|
|
|
|
|
|
# General transport handling. Takes care of directing
|
|
# packets according to transport tables and recording
|
|
# entries in reverse and link tables.
|
|
if RNS.Reticulum.transport_enabled() or from_local_client or for_local_client or for_local_client_link:
|
|
|
|
# If there is no transport id, but the packet is
|
|
# for a local client, we generate the transport
|
|
# id (it was stripped on the previous hop, since
|
|
# we "spoof" the hop count for clients behind a
|
|
# shared instance, so they look directly reach-
|
|
# able), and reinsert, so the normal transport
|
|
# implementation can handle the packet.
|
|
if packet.transport_id == None and for_local_client:
|
|
packet.transport_id = Transport.identity.hash
|
|
|
|
# If this is a cache request, and we can fullfill
|
|
# it, do so and stop processing. Otherwise resume
|
|
# normal processing.
|
|
if packet.context == RNS.Packet.CACHE_REQUEST:
|
|
if Transport.cache_request_packet(packet):
|
|
return
|
|
|
|
# If the packet is in transport, check whether we
|
|
# are the designated next hop, and process it
|
|
# accordingly if we are.
|
|
if packet.transport_id != None and packet.packet_type != RNS.Packet.ANNOUNCE:
|
|
if packet.transport_id == Transport.identity.hash:
|
|
RNS.log("Received packet in transport for "+RNS.prettyhexrep(packet.destination_hash)+" with matching transport ID, transporting it...", RNS.LOG_DEBUG)
|
|
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]
|
|
RNS.log("Next hop to destination is "+RNS.prettyhexrep(next_hop)+" with "+str(remaining_hops)+" hops remaining, transporting it.", RNS.LOG_DEBUG)
|
|
if remaining_hops > 1:
|
|
# Just increase hop count and transmit
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += next_hop
|
|
new_raw += packet.raw[12:]
|
|
elif remaining_hops == 1:
|
|
# Strip transport headers and transmit
|
|
new_flags = (RNS.Packet.HEADER_1) << 6 | (Transport.BROADCAST) << 4 | (packet.flags & 0b00001111)
|
|
new_raw = struct.pack("!B", new_flags)
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[12:]
|
|
elif remaining_hops == 0:
|
|
# Just increase hop count and transmit
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
|
|
outbound_interface = Transport.destination_table[packet.destination_hash][5]
|
|
outbound_interface.processOutgoing(new_raw)
|
|
Transport.destination_table[packet.destination_hash][0] = time.time()
|
|
|
|
if packet.packet_type == RNS.Packet.LINKREQUEST:
|
|
# Entry format is
|
|
link_entry = [ time.time(), # 0: Timestamp,
|
|
next_hop, # 1: Next-hop transport ID
|
|
outbound_interface, # 2: Next-hop interface
|
|
remaining_hops, # 3: Remaining hops
|
|
packet.receiving_interface, # 4: Received on interface
|
|
packet.hops, # 5: Taken hops
|
|
packet.destination_hash, # 6: Original destination hash
|
|
False] # 7: Validated
|
|
|
|
Transport.link_table[packet.getTruncatedHash()] = link_entry
|
|
|
|
else:
|
|
# Entry format is
|
|
reverse_entry = [ packet.receiving_interface, # 0: Received on interface
|
|
outbound_interface, # 1: Outbound interface
|
|
time.time()] # 2: Timestamp
|
|
|
|
Transport.reverse_table[packet.getTruncatedHash()] = reverse_entry
|
|
|
|
else:
|
|
# TODO: There should probably be some kind of REJECT
|
|
# mechanism here, to signal to the source that their
|
|
# expected path failed.
|
|
RNS.log("Got packet in transport, but no known path to final destination. Dropping packet.", RNS.LOG_DEBUG)
|
|
|
|
# Link transport handling. Directs packets according
|
|
# to entries in the link tables
|
|
if packet.packet_type != RNS.Packet.ANNOUNCE and packet.packet_type != RNS.Packet.LINKREQUEST and packet.context != RNS.Packet.LRPROOF:
|
|
if packet.destination_hash in Transport.link_table:
|
|
link_entry = Transport.link_table[packet.destination_hash]
|
|
# If receiving and outbound interface is
|
|
# the same for this link, direction doesn't
|
|
# matter, and we simply send the packet on.
|
|
outbound_interface = None
|
|
if link_entry[2] == link_entry[4]:
|
|
# But check that taken hops matches one
|
|
# of the expectede values.
|
|
if packet.hops == link_entry[3] or packet.hops == link_entry[5]:
|
|
outbound_interface = link_entry[2]
|
|
else:
|
|
# If interfaces differ, we transmit on
|
|
# the opposite interface of what the
|
|
# packet was received on.
|
|
if packet.receiving_interface == link_entry[2]:
|
|
# Also check that expected hop count matches
|
|
if packet.hops == link_entry[3]:
|
|
outbound_interface = link_entry[4]
|
|
elif packet.receiving_interface == link_entry[4]:
|
|
# Also check that expected hop count matches
|
|
if packet.hops == link_entry[5]:
|
|
outbound_interface = link_entry[2]
|
|
|
|
if outbound_interface != None:
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
outbound_interface.processOutgoing(new_raw)
|
|
Transport.link_table[packet.destination_hash][0] = time.time()
|
|
else:
|
|
pass
|
|
|
|
|
|
# Announce handling. Handles logic related to incoming
|
|
# announces, queueing rebroadcasts of these, and removal
|
|
# of queued announce rebroadcasts once handed to the next node.
|
|
if packet.packet_type == RNS.Packet.ANNOUNCE:
|
|
local_destination = next((d for d in Transport.destinations if d.hash == packet.destination_hash), None)
|
|
if local_destination == None and RNS.Identity.validateAnnounce(packet):
|
|
if packet.transport_id != None:
|
|
received_from = packet.transport_id
|
|
|
|
# Check if this is a next retransmission from
|
|
# another node. If it is, we're removing the
|
|
# announce in question from our pending table
|
|
if RNS.Reticulum.transport_enabled() and packet.destination_hash in Transport.announce_table:
|
|
announce_entry = Transport.announce_table[packet.destination_hash]
|
|
|
|
if packet.hops-1 == announce_entry[4]:
|
|
RNS.log("Heard a local rebroadcast of announce for "+RNS.prettyhexrep(packet.destination_hash), RNS.LOG_DEBUG)
|
|
announce_entry[6] += 1
|
|
if announce_entry[6] >= Transport.LOCAL_REBROADCASTS_MAX:
|
|
RNS.log("Max local rebroadcasts of announce for "+RNS.prettyhexrep(packet.destination_hash)+" reached, dropping announce from our table", RNS.LOG_DEBUG)
|
|
Transport.announce_table.pop(packet.destination_hash)
|
|
|
|
if packet.hops-1 == announce_entry[4]+1 and announce_entry[2] > 0:
|
|
now = time.time()
|
|
if now < announce_entry[1]:
|
|
RNS.log("Rebroadcasted announce for "+RNS.prettyhexrep(packet.destination_hash)+" has been passed on to next node, no further tries needed", RNS.LOG_DEBUG)
|
|
Transport.announce_table.pop(packet.destination_hash)
|
|
|
|
else:
|
|
received_from = packet.destination_hash
|
|
|
|
# Check if this announce should be inserted into
|
|
# announce and destination tables
|
|
should_add = False
|
|
|
|
# First, check that the announce is not for a destination
|
|
# local to this system, and that hops are less than the max
|
|
if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
|
|
random_blob = packet.data[RNS.Identity.DERKEYSIZE//8+10:RNS.Identity.DERKEYSIZE//8+20]
|
|
random_blobs = []
|
|
if packet.destination_hash in Transport.destination_table:
|
|
random_blobs = Transport.destination_table[packet.destination_hash][4]
|
|
|
|
# If we already have a path to the announced
|
|
# destination, but the hop count is equal or
|
|
# less, we'll update our tables.
|
|
if packet.hops <= Transport.destination_table[packet.destination_hash][2]:
|
|
# Make sure we haven't heard the random
|
|
# blob before, so announces can't be
|
|
# replayed to forge paths.
|
|
# TODO: Check whether this approach works
|
|
# under all circumstances
|
|
if not random_blob in random_blobs:
|
|
should_add = True
|
|
else:
|
|
should_add = False
|
|
else:
|
|
# If an announce arrives with a larger hop
|
|
# count than we already have in the table,
|
|
# ignore it, unless the path is expired
|
|
if (time.time() > Transport.destination_table[packet.destination_hash][3]):
|
|
# We also check that the announce hash is
|
|
# different from ones we've already heard,
|
|
# to avoid loops in the network
|
|
if not random_blob in random_blobs:
|
|
# TODO: Check that this ^ approach actually
|
|
# works under all circumstances
|
|
RNS.log("Replacing destination table entry for "+str(RNS.prettyhexrep(packet.destination_hash))+" with new announce due to expired path", RNS.LOG_DEBUG)
|
|
should_add = True
|
|
else:
|
|
should_add = False
|
|
else:
|
|
should_add = False
|
|
else:
|
|
# If this destination is unknown in our table
|
|
# we should add it
|
|
should_add = True
|
|
|
|
if should_add:
|
|
now = time.time()
|
|
retries = 0
|
|
expires = now + Transport.PATHFINDER_E
|
|
announce_hops = packet.hops
|
|
local_rebroadcasts = 0
|
|
block_rebroadcasts = False
|
|
attached_interface = None
|
|
retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW)
|
|
|
|
random_blobs.append(random_blob)
|
|
|
|
if (RNS.Reticulum.transport_enabled() or Transport.from_local_client(packet)) and packet.context != RNS.Packet.PATH_RESPONSE:
|
|
# If the announce is from a local client,
|
|
# we announce it immediately, but only one
|
|
# time.
|
|
if Transport.from_local_client(packet):
|
|
retransmit_timeout = now
|
|
retries = Transport.PATHFINDER_R
|
|
|
|
Transport.announce_table[packet.destination_hash] = [
|
|
now,
|
|
retransmit_timeout,
|
|
retries,
|
|
received_from,
|
|
announce_hops,
|
|
packet,
|
|
local_rebroadcasts,
|
|
block_rebroadcasts,
|
|
attached_interface
|
|
]
|
|
|
|
# If we have any local clients connected, we re-
|
|
# transmit the announce to them immediately
|
|
if (len(Transport.local_client_interfaces)):
|
|
announce_identity = RNS.Identity.recall(packet.destination_hash)
|
|
announce_destination = RNS.Destination(announce_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "unknown", "unknown");
|
|
announce_destination.hash = packet.destination_hash
|
|
announce_destination.hexhash = announce_destination.hash.hex()
|
|
announce_context = RNS.Packet.NONE
|
|
announce_data = packet.data
|
|
|
|
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 = attached_interface
|
|
)
|
|
|
|
new_announce.hops = packet.hops
|
|
new_announce.send()
|
|
|
|
Transport.destination_table[packet.destination_hash] = [now, received_from, announce_hops, expires, random_blobs, packet.receiving_interface, packet]
|
|
RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" is now "+str(announce_hops)+" hops away via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_VERBOSE)
|
|
|
|
# Handling for linkrequests to local destinations
|
|
elif packet.packet_type == RNS.Packet.LINKREQUEST:
|
|
for destination in Transport.destinations:
|
|
if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
|
|
packet.destination = destination
|
|
destination.receive(packet)
|
|
|
|
# Handling for local data packets
|
|
elif packet.packet_type == RNS.Packet.DATA:
|
|
if packet.destination_type == RNS.Destination.LINK:
|
|
for link in Transport.active_links:
|
|
if link.link_id == packet.destination_hash:
|
|
packet.link = link
|
|
link.receive(packet)
|
|
else:
|
|
for destination in Transport.destinations:
|
|
if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
|
|
packet.destination = destination
|
|
destination.receive(packet)
|
|
|
|
if destination.proof_strategy == RNS.Destination.PROVE_ALL:
|
|
packet.prove()
|
|
|
|
elif destination.proof_strategy == RNS.Destination.PROVE_APP:
|
|
if destination.callbacks.proof_requested:
|
|
if destination.callbacks.proof_requested(packet):
|
|
packet.prove()
|
|
|
|
# Handling for proofs and link-request proofs
|
|
elif packet.packet_type == RNS.Packet.PROOF:
|
|
if packet.context == RNS.Packet.LRPROOF:
|
|
# This is a link request proof, check if it
|
|
# needs to be transported
|
|
if (RNS.Reticulum.transport_enabled() or for_local_client_link or from_local_client) and packet.destination_hash in Transport.link_table:
|
|
link_entry = Transport.link_table[packet.destination_hash]
|
|
if packet.receiving_interface == link_entry[2]:
|
|
# TODO: Should we validate the LR proof at each transport
|
|
# step before transporting it?
|
|
RNS.log("Link request proof received on correct interface, transporting it via "+str(link_entry[4]), RNS.LOG_DEBUG)
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
Transport.link_table[packet.destination_hash][7] = True
|
|
link_entry[4].processOutgoing(new_raw)
|
|
else:
|
|
RNS.log("Link request proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
|
|
else:
|
|
# Check if we can deliver it to a local
|
|
# pending link
|
|
for link in Transport.pending_links:
|
|
if link.link_id == packet.destination_hash:
|
|
link.validateProof(packet)
|
|
|
|
elif packet.context == RNS.Packet.RESOURCE_PRF:
|
|
for link in Transport.active_links:
|
|
if link.link_id == packet.destination_hash:
|
|
link.receive(packet)
|
|
else:
|
|
if packet.destination_type == RNS.Destination.LINK:
|
|
for link in Transport.active_links:
|
|
if link.link_id == packet.destination_hash:
|
|
packet.link = link
|
|
|
|
if len(packet.data) == RNS.PacketReceipt.EXPL_LENGTH:
|
|
proof_hash = packet.data[:RNS.Identity.HASHLENGTH//8]
|
|
else:
|
|
proof_hash = None
|
|
|
|
# Check if this proof neds to be transported
|
|
if (RNS.Reticulum.transport_enabled() or from_local_client or proof_for_local_client) and packet.destination_hash in Transport.reverse_table:
|
|
reverse_entry = Transport.reverse_table.pop(packet.destination_hash)
|
|
if packet.receiving_interface == reverse_entry[1]:
|
|
RNS.log("Proof received on correct interface, transporting it via "+str(reverse_entry[0]), RNS.LOG_DEBUG)
|
|
new_raw = packet.raw[0:1]
|
|
new_raw += struct.pack("!B", packet.hops)
|
|
new_raw += packet.raw[2:]
|
|
reverse_entry[0].processOutgoing(new_raw)
|
|
else:
|
|
RNS.log("Proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
|
|
|
|
for receipt in Transport.receipts:
|
|
receipt_validated = False
|
|
if proof_hash != None:
|
|
# Only test validation if hash matches
|
|
if receipt.hash == proof_hash:
|
|
receipt_validated = receipt.validateProofPacket(packet)
|
|
else:
|
|
# In case of an implicit proof, we have
|
|
# to check every single outstanding receipt
|
|
receipt_validated = receipt.validateProofPacket(packet)
|
|
|
|
if receipt_validated:
|
|
Transport.receipts.remove(receipt)
|
|
|
|
Transport.jobs_locked = False
|
|
|
|
@staticmethod
|
|
def registerDestination(destination):
|
|
destination.MTU = RNS.Reticulum.MTU
|
|
if destination.direction == RNS.Destination.IN:
|
|
Transport.destinations.append(destination)
|
|
|
|
@staticmethod
|
|
def deregister_destination(destination):
|
|
if destination in Transport.destinations:
|
|
Transport.destinations.remove(destination)
|
|
|
|
@staticmethod
|
|
def registerLink(link):
|
|
RNS.log("Registering link "+str(link), RNS.LOG_DEBUG)
|
|
if link.initiator:
|
|
Transport.pending_links.append(link)
|
|
else:
|
|
Transport.active_links.append(link)
|
|
|
|
@staticmethod
|
|
def activateLink(link):
|
|
RNS.log("Activating link "+str(link), RNS.LOG_DEBUG)
|
|
if link in Transport.pending_links:
|
|
Transport.pending_links.remove(link)
|
|
Transport.active_links.append(link)
|
|
link.status = RNS.Link.ACTIVE
|
|
else:
|
|
RNS.log("Attempted to activate a link that was not in the pending table", RNS.LOG_ERROR)
|
|
|
|
@staticmethod
|
|
def find_interface_from_hash(interface_hash):
|
|
for interface in Transport.interfaces:
|
|
if interface.get_hash() == interface_hash:
|
|
return interface
|
|
|
|
return None
|
|
|
|
@staticmethod
|
|
def shouldCache(packet):
|
|
if packet.context == RNS.Packet.RESOURCE_PRF:
|
|
return True
|
|
|
|
return False
|
|
|
|
# When caching packets to storage, they are written
|
|
# exactly as they arrived over their interface. This
|
|
# means that they have not had their hop count
|
|
# increased yet! Take note of this when reading from
|
|
# the packet cache.
|
|
@staticmethod
|
|
def cache(packet, force_cache=False):
|
|
if RNS.Transport.shouldCache(packet) or force_cache:
|
|
try:
|
|
packet_hash = RNS.hexrep(packet.getHash(), delimit=False)
|
|
interface_reference = None
|
|
if packet.receiving_interface != None:
|
|
interface_reference = str(packet.receiving_interface)
|
|
|
|
file = open(RNS.Reticulum.cachepath+"/"+packet_hash, "wb")
|
|
file.write(umsgpack.packb([packet.raw, interface_reference]))
|
|
file.close()
|
|
|
|
except Exception as e:
|
|
RNS.log("Error writing packet to cache", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e))
|
|
|
|
@staticmethod
|
|
def get_cached_packet(packet_hash):
|
|
try:
|
|
packet_hash = RNS.hexrep(packet_hash, delimit=False)
|
|
path = RNS.Reticulum.cachepath+"/"+packet_hash
|
|
|
|
if os.path.isfile(path):
|
|
file = open(path, "rb")
|
|
cached_data = umsgpack.unpackb(file.read())
|
|
file.close()
|
|
|
|
packet = RNS.Packet(None, cached_data[0])
|
|
interface_reference = cached_data[1]
|
|
|
|
for interface in Transport.interfaces:
|
|
if str(interface) == interface_reference:
|
|
packet.receiving_interface = interface
|
|
|
|
return packet
|
|
else:
|
|
return None
|
|
except Exception as e:
|
|
RNS.log("Exception occurred while getting cached packet.", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
@staticmethod
|
|
def cache_request_packet(packet):
|
|
if len(packet.data) == RNS.Identity.HASHLENGTH/8:
|
|
packet = Transport.get_cached_packet(packet.data)
|
|
|
|
if packet != None:
|
|
# If the packet was retrieved from the local
|
|
# cache, replay it to the Transport instance,
|
|
# so that it can be directed towards it original
|
|
# destination.
|
|
Transport.inbound(packet.raw, packet.receiving_interface)
|
|
return True
|
|
else:
|
|
return False
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def cache_request(packet_hash, destination):
|
|
cached_packet = Transport.get_cached_packet(packet_hash)
|
|
if cached_packet:
|
|
# The packet was found in the local cache,
|
|
# replay it to the Transport instance.
|
|
Transport.inbound(packet.raw, packet.receiving_interface)
|
|
else:
|
|
# The packet is not in the local cache,
|
|
# query the network.
|
|
RNS.Packet(destination, packet_hash, context = RNS.Packet.CACHE_REQUEST).send()
|
|
|
|
@staticmethod
|
|
def hasPath(destination_hash):
|
|
if destination_hash in Transport.destination_table:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def requestPath(destination_hash):
|
|
path_request_data = destination_hash + RNS.Identity.getRandomHash()
|
|
path_request_dst = RNS.Destination(None, RNS.Destination.OUT, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
|
|
packet = RNS.Packet(path_request_dst, path_request_data, packet_type = RNS.Packet.DATA, transport_type = RNS.Transport.BROADCAST, header_type = RNS.Packet.HEADER_1)
|
|
packet.send()
|
|
|
|
@staticmethod
|
|
def requestPathOnInterface(destination_hash, interface):
|
|
path_request_data = destination_hash + RNS.Identity.getRandomHash()
|
|
path_request_dst = RNS.Destination(None, RNS.Destination.OUT, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
|
|
packet = RNS.Packet(path_request_dst, path_request_data, packet_type = RNS.Packet.DATA, transport_type = RNS.Transport.BROADCAST, header_type = RNS.Packet.HEADER_1, attached_interface = interface)
|
|
packet.send()
|
|
|
|
@staticmethod
|
|
def path_request_handler(data, packet):
|
|
if len(data) >= RNS.Identity.TRUNCATED_HASHLENGTH//8:
|
|
Transport.pathRequest(
|
|
data[:RNS.Identity.TRUNCATED_HASHLENGTH//8],
|
|
Transport.from_local_client(packet),
|
|
packet.receiving_interface
|
|
)
|
|
|
|
@staticmethod
|
|
def pathRequest(destination_hash, is_from_local_client, attached_interface):
|
|
RNS.log("Path request for "+RNS.prettyhexrep(destination_hash), RNS.LOG_DEBUG)
|
|
|
|
local_destination = next((d for d in Transport.destinations if d.hash == destination_hash), None)
|
|
if local_destination != None:
|
|
RNS.log("Destination is local to this system, announcing", RNS.LOG_DEBUG)
|
|
local_destination.announce(path_response=True)
|
|
|
|
elif (RNS.Reticulum.transport_enabled() or is_from_local_client) and destination_hash in Transport.destination_table:
|
|
RNS.log("Path found, inserting announce for transmission", RNS.LOG_DEBUG)
|
|
packet = Transport.destination_table[destination_hash][6]
|
|
received_from = Transport.destination_table[destination_hash][5]
|
|
|
|
now = time.time()
|
|
retries = Transport.PATHFINDER_R
|
|
local_rebroadcasts = 0
|
|
block_rebroadcasts = True
|
|
announce_hops = packet.hops
|
|
|
|
if is_from_local_client:
|
|
retransmit_timeout = now
|
|
else:
|
|
# TODO: Look at this timing
|
|
retransmit_timeout = now + Transport.PATH_REQUEST_GRACE # + (RNS.rand() * Transport.PATHFINDER_RW)
|
|
|
|
# This handles an edge case where a peer sends a past
|
|
# request for a destination just after an announce for
|
|
# said destination has arrived, but before it has been
|
|
# rebroadcast locally. In such a case the actual announce
|
|
# is temporarily held, and then reinserted when the path
|
|
# request has been served to the peer.
|
|
if packet.destination_hash in Transport.announce_table:
|
|
held_entry = Transport.announce_table[packet.destination_hash]
|
|
Transport.held_announces[packet.destination_hash] = held_entry
|
|
|
|
Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, announce_hops, packet, local_rebroadcasts, block_rebroadcasts, attached_interface]
|
|
|
|
elif is_from_local_client:
|
|
# Forward path request on all interfaces
|
|
# except the local client
|
|
for interface in Transport.interfaces:
|
|
if not interface == attached_interface:
|
|
Transport.requestPathOnInterface(destination_hash, interface)
|
|
|
|
elif not is_from_local_client and len(Transport.local_client_interfaces) > 0:
|
|
# Forward the path request on all local
|
|
# client interfaces
|
|
for interface in Transport.local_client_interfaces:
|
|
Transport.requestPathOnInterface(destination_hash, interface)
|
|
|
|
else:
|
|
RNS.log("No known path to requested destination, ignoring request", RNS.LOG_DEBUG)
|
|
|
|
@staticmethod
|
|
def from_local_client(packet):
|
|
if hasattr(packet.receiving_interface, "parent_interface"):
|
|
return Transport.is_local_client_interface(packet.receiving_interface)
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def is_local_client_interface(interface):
|
|
if hasattr(interface, "parent_interface"):
|
|
if hasattr(interface.parent_interface, "is_local_shared_instance"):
|
|
return True
|
|
else:
|
|
return False
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def interface_to_shared_instance(interface):
|
|
if hasattr(interface, "is_connected_to_shared_instance"):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def exitHandler():
|
|
RNS.log("Saving packet hashlist to storage...", RNS.LOG_VERBOSE)
|
|
try:
|
|
packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
|
|
file = open(packet_hashlist_path, "wb")
|
|
file.write(umsgpack.packb(Transport.packet_hashlist))
|
|
file.close()
|
|
RNS.log("Done packet hashlist to storage", RNS.LOG_VERBOSE)
|
|
except Exception as e:
|
|
RNS.log("Could not save packet hashlist to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
if not Transport.owner.is_connected_to_shared_instance:
|
|
RNS.log("Saving path table to storage...", RNS.LOG_VERBOSE)
|
|
try:
|
|
serialised_destinations = []
|
|
for destination_hash in Transport.destination_table:
|
|
# Get the destination entry from the destination table
|
|
de = Transport.destination_table[destination_hash]
|
|
interface_hash = de[5].get_hash()
|
|
|
|
# Only store destination table entry if the associated
|
|
# interface is still active
|
|
interface = Transport.find_interface_from_hash(interface_hash)
|
|
if interface != None:
|
|
# Get the destination entry from the destination table
|
|
de = Transport.destination_table[destination_hash]
|
|
timestamp = de[0]
|
|
received_from = de[1]
|
|
hops = de[2]
|
|
expires = de[3]
|
|
random_blobs = de[4]
|
|
packet_hash = de[6].getHash()
|
|
|
|
serialised_entry = [
|
|
destination_hash,
|
|
timestamp,
|
|
received_from,
|
|
hops,
|
|
expires,
|
|
random_blobs,
|
|
interface_hash,
|
|
packet_hash
|
|
]
|
|
|
|
serialised_destinations.append(serialised_entry)
|
|
|
|
Transport.cache(de[6], force_cache=True)
|
|
|
|
destination_table_path = RNS.Reticulum.storagepath+"/destination_table"
|
|
file = open(destination_table_path, "wb")
|
|
file.write(umsgpack.packb(serialised_destinations))
|
|
file.close()
|
|
RNS.log("Done saving path table to storage", RNS.LOG_VERBOSE)
|
|
except Exception as e:
|
|
RNS.log("Could not save path table to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
|