mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-09-12 08:40:04 +00:00
539 lines
21 KiB
Python
Executable File
539 lines
21 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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import vendor.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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# 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 = 2 # 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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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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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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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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identity = None
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@staticmethod
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def start():
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if Transport.identity == None:
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transport_identity_path = RNS.Reticulum.configdir+"/transportidentity"
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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 on disk, 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 disk", RNS.LOG_VERBOSE)
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packet_hashlist_path = RNS.Reticulum.configdir+"/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, "r")
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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 disk, the contained exception was: "+str(e), RNS.LOG_ERROR)
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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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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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for receipt in Transport.receipts:
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thread = threading.Thread(target=receipt.check_timeout)
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thread.setDaemon(True)
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thread.start()
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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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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.encode("hex_codec")
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new_packet = RNS.Packet(announce_destination, announce_data, RNS.Packet.ANNOUNCE, header_type = RNS.Packet.HEADER_2, transport_type = Transport.TRANSPORT, transport_id = Transport.identity.hash)
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new_packet.hops = announce_entry[4]
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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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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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# Cull the reverse table according to max size and/or age of entries
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# TODO: Implement this
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# Cull the destination table in some way
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# TODO: Implement this
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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
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# in the destination 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 Transport.destination_table[packet.destination_hash][2] > 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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# RNS.log("Transporting "+str(len(packet.raw))+" bytes via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
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# RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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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_DEBUG)
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outbound_interface.processOutgoing(new_raw)
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sent = True
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else:
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# Destination is directly reachable, and we know on
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# what interface, so transmit only on that one
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# TODO: Strip transport headers here
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RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(outbound_interface), RNS.LOG_EXTREME)
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RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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outbound_interface.processOutgoing(packet.raw)
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sent = True
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else:
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# Broadcast packet on all outgoing interfaces
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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 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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if (packet.packet_type == RNS.Packet.DATA):
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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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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 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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@staticmethod
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def inbound(raw, interface=None):
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# TODO: Rewrite the redundant cache calls in this method
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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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packet = RNS.Packet(None, raw)
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packet.unpack()
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packet.receiving_interface = interface
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packet.hops += 1
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RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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if Transport.packet_filter(packet):
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Transport.packet_hashlist.append(packet.packet_hash)
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if packet.transport_id != None and packet.packet_type != RNS.Packet.ANNOUNCE:
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if packet.transport_id == Transport.identity.hash:
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RNS.log("Received packet in transport for "+RNS.prettyhexrep(packet.destination_hash)+" with matching transport ID, transporting it...", RNS.LOG_DEBUG)
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if packet.destination_hash in Transport.destination_table:
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next_hop = Transport.destination_table[packet.destination_hash][1]
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RNS.log("Next hop to destination is "+RNS.prettyhexrep(next_hop)+", transporting it.", RNS.LOG_DEBUG)
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new_raw = packet.raw[0:1]
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new_raw += struct.pack("!B", packet.hops)
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new_raw += next_hop
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new_raw += packet.raw[12:]
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outbound_interface = Transport.destination_table[packet.destination_hash][5]
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outbound_interface.processOutgoing(new_raw)
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Transport.reverse_table[packet.packet_hash[:10]] = [packet.receiving_interface, outbound_interface, time.time()]
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else:
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# TODO: There should probably be some kind of REJECT
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# mechanism here, to signal to the source that their
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# expected path failed
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RNS.log("Got packet in transport, but no known path to final destination. Dropping packet.", RNS.LOG_DEBUG)
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else:
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# TODO: Remove this log statement
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RNS.log("Received packet in transport, but transport ID doesn't match, not transporting it further.", RNS.LOG_DEBUG)
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# Announce handling. Handles logic related to incoming
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# announces, queueing rebroadcasts of these, and removal
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# of queued announce rebroadcasts once handed to the next node
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if packet.packet_type == RNS.Packet.ANNOUNCE:
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if RNS.Identity.validateAnnounce(packet):
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if packet.transport_id != None:
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received_from = packet.transport_id
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# Check if this is a next retransmission from
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# another node. If it is, we're removing the
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# announce in question from our pending table
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if packet.destination_hash in Transport.announce_table:
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announce_entry = Transport.announce_table[packet.destination_hash]
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if packet.hops-1 == announce_entry[4]:
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RNS.log("Heard a local rebroadcast of announce for "+RNS.prettyhexrep(packet.destination_hash), RNS.LOG_DEBUG)
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announce_entry[6] += 1
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if announce_entry[6] >= Transport.LOCAL_REBROADCASTS_MAX:
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RNS.log("Max local rebroadcasts of announce for "+RNS.prettyhexrep(packet.destination_hash)+" reached, dropping announce from our table", RNS.LOG_DEBUG)
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Transport.announce_table.pop(packet.destination_hash)
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if packet.hops-1 == announce_entry[4]+1 and announce_entry[2] > 0:
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now = time.time()
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if now < announce_entry[1]:
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RNS.log("Rebroadcasted announce for "+RNS.prettyhexrep(packet.destination_hash)+" has been passed on to next node, no further tries needed", RNS.LOG_DEBUG)
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Transport.announce_table.pop(packet.destination_hash)
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else:
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received_from = packet.destination_hash
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# Check if this announce should be inserted into
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# announce and destination tables
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should_add = False
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# First, check that the announce is not for a destination
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# local to this system, and that hops are less than the max
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if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
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random_blob = packet.data[RNS.Identity.DERKEYSIZE/8+10:RNS.Identity.DERKEYSIZE/8+20]
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random_blobs = []
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if packet.destination_hash in Transport.destination_table:
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random_blobs = Transport.destination_table[packet.destination_hash][4]
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# If we already have a path to the announced
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# destination, but the hop count is equal or
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# less, we'll update our tables.
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if packet.hops <= Transport.destination_table[packet.destination_hash][2]:
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# Make sure we haven't heard the random
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# blob before, so announces can't be
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# replayed to forge paths.
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# TODO: Check whether this approach works
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# under all circumstances
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if not random_blob in random_blobs:
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should_add = True
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else:
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should_add = False
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else:
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# If an announce arrives with a larger hop
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# count than we already have in the table,
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# ignore it, unless the path is expired
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if (time.time() > Transport.destination_table[packet.destination_hash][3]):
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# We also check that the announce hash is
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# different from ones we've already heard,
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# to avoid loops in the network
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if not random_blob in random_blobs:
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# TODO: Check that this ^ approach actually
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# works under all circumstances
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RNS.log("Replacing destination table entry for "+str(RNS.prettyhexrep(packet.destination_hash))+" with new announce due to expired path", RNS.LOG_DEBUG)
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should_add = True
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else:
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should_add = False
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else:
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should_add = False
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else:
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# If this destination is unknown in our table
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# we should add it
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should_add = True
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if should_add:
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now = time.time()
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retries = 0
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expires = now + Transport.PATHFINDER_E
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local_rebroadcasts = 0
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random_blobs.append(random_blob)
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retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW)
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Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, packet.hops, packet, local_rebroadcasts]
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Transport.destination_table[packet.destination_hash] = [now, received_from, packet.hops, expires, random_blobs, packet.receiving_interface]
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RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" is now via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_DEBUG)
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elif packet.packet_type == RNS.Packet.LINKREQUEST:
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for destination in Transport.destinations:
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if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
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packet.destination = destination
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destination.receive(packet)
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Transport.cache(packet)
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elif packet.packet_type == RNS.Packet.DATA:
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if packet.destination_type == RNS.Destination.LINK:
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for link in Transport.active_links:
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if link.link_id == packet.destination_hash:
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packet.link = link
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link.receive(packet)
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Transport.cache(packet)
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else:
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for destination in Transport.destinations:
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if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
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packet.destination = destination
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destination.receive(packet)
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Transport.cache(packet)
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if destination.proof_strategy == RNS.Destination.PROVE_ALL:
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packet.prove()
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elif destination.proof_strategy == RNS.Destination.PROVE_APP:
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if destination.callbacks.proof_requested:
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if destination.callbacks.proof_requested(packet):
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packet.prove()
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elif packet.packet_type == RNS.Packet.PROOF:
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if packet.context == RNS.Packet.LRPROOF:
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# This is a link request proof, forward
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# to a waiting link request
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for link in Transport.pending_links:
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if link.link_id == packet.destination_hash:
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link.validateProof(packet)
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elif packet.context == RNS.Packet.RESOURCE_PRF:
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for link in Transport.active_links:
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if link.link_id == packet.destination_hash:
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link.receive(packet)
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else:
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if packet.destination_type == RNS.Destination.LINK:
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for link in Transport.active_links:
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if link.link_id == packet.destination_hash:
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packet.link = link
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# plaintext = link.decrypt(packet.data)
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# TODO: Make sure everything uses new proof handling
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if len(packet.data) == RNS.PacketReceipt.EXPL_LENGTH:
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proof_hash = packet.data[:RNS.Identity.HASHLENGTH/8]
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else:
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proof_hash = None
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# Check if this proof neds to be transported
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if packet.destination_hash in Transport.reverse_table:
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reverse_entry = Transport.reverse_table[packet.destination_hash]
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if packet.receiving_interface == reverse_entry[1]:
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RNS.log("Proof received on correct interface, transporting it via "+str(reverse_entry[0]), RNS.LOG_DEBUG)
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new_raw = packet.raw[0:1]
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new_raw += struct.pack("!B", packet.hops)
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new_raw += packet.raw[2:]
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reverse_entry[0].processOutgoing(new_raw)
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else:
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RNS.log("Proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
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for receipt in Transport.receipts:
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receipt_validated = False
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if proof_hash != None:
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# Only test validation if hash matches
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if receipt.hash == proof_hash:
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receipt_validated = receipt.validateProofPacket(packet)
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else:
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# In case of an implicit proof, we have
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# to check every single outstanding receipt
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receipt_validated = receipt.validateProofPacket(packet)
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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 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 shouldCache(packet):
|
|
# TODO: Implement sensible rules for which
|
|
# packets to cache
|
|
if packet.context == RNS.Packet.RESOURCE_PRF:
|
|
return True
|
|
|
|
return False
|
|
|
|
@staticmethod
|
|
def cache(packet):
|
|
if RNS.Transport.shouldCache(packet):
|
|
try:
|
|
packet_hash = RNS.hexrep(packet.getHash(), delimit=False)
|
|
file = open(RNS.Reticulum.cachepath+"/"+packet_hash, "w")
|
|
file.write(packet.raw)
|
|
file.close()
|
|
RNS.log("Wrote packet "+packet_hash+" to cache", RNS.LOG_EXTREME)
|
|
except Exception as e:
|
|
RNS.log("Error writing packet to cache", RNS.LOG_ERROR)
|
|
RNS.log("The contained exception was: "+str(e))
|
|
|
|
@staticmethod
|
|
def cache_request_packet(packet):
|
|
if len(packet.data) == RNS.Identity.HASHLENGTH/8:
|
|
packet_hash = RNS.hexrep(packet.data, delimit=False)
|
|
path = RNS.Reticulum.cachepath+"/"+packet_hash
|
|
if os.path.isfile(path):
|
|
file = open(path, "r")
|
|
raw = file.read()
|
|
file.close()
|
|
packet = RNS.Packet(None, raw)
|
|
# TODO: Implement outbound for this
|
|
|
|
|
|
@staticmethod
|
|
def cache_request(packet_hash):
|
|
RNS.log("Cache request for "+RNS.prettyhexrep(packet_hash), RNS.LOG_EXTREME)
|
|
path = RNS.Reticulum.cachepath+"/"+RNS.hexrep(packet_hash, delimit=False)
|
|
if os.path.isfile(path):
|
|
file = open(path, "r")
|
|
raw = file.read()
|
|
Transport.inbound(raw)
|
|
file.close()
|
|
else:
|
|
cache_request_packet = RNS.Packet(Transport.transport_destination(), packet_hash, context = RNS.Packet.CACHE_REQUEST)
|
|
|
|
@staticmethod
|
|
def transport_destination():
|
|
# TODO: implement this
|
|
pass
|
|
|
|
@staticmethod
|
|
def exitHandler():
|
|
try:
|
|
packet_hashlist_path = RNS.Reticulum.configdir+"/packet_hashlist"
|
|
file = open(packet_hashlist_path, "w")
|
|
file.write(umsgpack.packb(Transport.packet_hashlist))
|
|
file.close()
|
|
except Exception as e:
|
|
RNS.log("Could not save packet hashlist to disk, the contained exception was: "+str(e), RNS.LOG_ERROR)
|