Git-Mirrors/Reticulum
1
0
Fork 0
mirror of https://github.com/markqvist/Reticulum.git synced 2024-10-01 03:15:44 -04:00
Code Issues Actions Packages Projects Releases Wiki Activity
d754ed989c
Reticulum/RNS/Transport.py
Mark Qvist d754ed989c Implemented transport for links
2020-03-06 22:20:50 +01:00

691 lines
27 KiB
Python
Executable File
Raw Blame History

import os
import RNS
import time
import math
import struct
import threading
import traceback
from time import sleep
import vendor.umsgpack as umsgpack
class Transport:
# Constants
BROADCAST = 0x00;
TRANSPORT = 0x01;
RELAY = 0x02;
TUNNEL = 0x03;
types = [BROADCAST, TRANSPORT, RELAY, TUNNEL]
REACHABILITY_UNREACHABLE = 0x00
REACHABILITY_DIRECT = 0x01
REACHABILITY_TRANSPORT = 0x02
APP_NAME = "rnstransport"
# TODO: Document the addition of random windows
# and max local rebroadcasts.
PATHFINDER_M = 18 # Max hops
PATHFINDER_C = 2.0 # Decay constant
PATHFINDER_R = 1 # Retransmit retries
PATHFINDER_T = 10 # Retry grace period
PATHFINDER_RW = 10 # Random window for announce rebroadcast
PATHFINDER_E = 60*15 # Path expiration in seconds
# TODO: Calculate an optimal number for this in
# various situations
LOCAL_REBROADCASTS_MAX = 2 # How many local rebroadcasts of an announce is allowed
PATH_REQUEST_GRACE = 0.25 # Grace time before a path announcement is made, allows directly reachable peers to respond first
PATH_REQUEST_RW = 2 # Path request random window
interfaces = [] # All active interfaces
destinations = [] # All active destinations
pending_links = [] # Links that are being established
active_links = [] # Links that are active
packet_hashlist = [] # A list of packet hashes for duplicate detection
receipts = [] # Receipts of all outgoing packets for proof processing
announce_table = {} # A table for storing announces currently waiting to be retransmitted
destination_table = {} # A lookup table containing the next hop to a given destination
reverse_table = {} # A lookup table for storing packet hashes used to return proofs and replies
link_table = {} # A lookup table containing hops for links
jobs_locked = False
jobs_running = False
job_interval = 0.250
receipts_last_checked = 0.0
receipts_check_interval = 1.0
announces_last_checked = 0.0
announces_check_interval = 1.0
hashlist_maxsize = 1000000
identity = None
@staticmethod
def start():
if Transport.identity == None:
transport_identity_path = RNS.Reticulum.configdir+"/transportidentity"
if os.path.isfile(transport_identity_path):
Transport.identity = RNS.Identity.from_file(transport_identity_path)
if Transport.identity == None:
RNS.log("No valid Transport Identity on disk, creating...", RNS.LOG_VERBOSE)
Transport.identity = RNS.Identity()
Transport.identity.save(transport_identity_path)
else:
RNS.log("Loaded Transport Identity from disk", RNS.LOG_VERBOSE)
packet_hashlist_path = RNS.Reticulum.configdir+"/packet_hashlist"
if os.path.isfile(packet_hashlist_path):
try:
file = open(packet_hashlist_path, "r")
Transport.packet_hashlist = umsgpack.unpackb(file.read())
file.close()
except Exception as e:
RNS.log("Could not load packet hashlist from disk, the contained exception was: "+str(e), RNS.LOG_ERROR)
# Create transport-specific destinations
path_request_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
path_request_destination.packet_callback(Transport.pathRequestHandler)
thread = threading.Thread(target=Transport.jobloop)
thread.setDaemon(True)
thread.start()
RNS.log("Transport instance "+str(Transport.identity)+" started")
@staticmethod
def jobloop():
while (True):
Transport.jobs()
sleep(Transport.job_interval)
@staticmethod
def jobs():
outgoing = []
Transport.jobs_running = True
try:
if not Transport.jobs_locked:
# Process receipts list for timed-out packets
if time.time() > Transport.receipts_last_checked+Transport.receipts_check_interval:
for receipt in Transport.receipts:
thread = threading.Thread(target=receipt.check_timeout)
thread.setDaemon(True)
thread.start()
if receipt.status != RNS.PacketReceipt.SENT:
Transport.receipts.remove(receipt)
Transport.receipts_last_checked = time.time()
# Process announces needing retransmission
if time.time() > Transport.announces_last_checked+Transport.announces_check_interval:
for destination_hash in Transport.announce_table:
announce_entry = Transport.announce_table[destination_hash]
if announce_entry[2] > Transport.PATHFINDER_R:
RNS.log("Dropping announce for "+RNS.prettyhexrep(destination_hash)+", retries exceeded", RNS.LOG_DEBUG)
Transport.announce_table.pop(destination_hash)
break
else:
if time.time() > announce_entry[1]:
announce_entry[1] = time.time() + math.pow(Transport.PATHFINDER_C, announce_entry[4]) + Transport.PATHFINDER_T + Transport.PATHFINDER_RW
announce_entry[2] += 1
packet = announce_entry[5]
block_rebroadcasts = announce_entry[7]
announce_context = RNS.Packet.NONE
if block_rebroadcasts:
announce_context = RNS.Packet.PATH_RESPONSE
announce_data = packet.data
announce_identity = RNS.Identity.recall(packet.destination_hash)
announce_destination = RNS.Destination(announce_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "unknown", "unknown");
announce_destination.hash = packet.destination_hash
announce_destination.hexhash = announce_destination.hash.encode("hex_codec")
new_packet = RNS.Packet(announce_destination, announce_data, RNS.Packet.ANNOUNCE, context = announce_context, header_type = RNS.Packet.HEADER_2, transport_type = Transport.TRANSPORT, transport_id = Transport.identity.hash)
new_packet.hops = announce_entry[4]
RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
outgoing.append(new_packet)
Transport.announces_last_checked = time.time()
# Cull the packet hashlist if it has reached max size
while (len(Transport.packet_hashlist) > Transport.hashlist_maxsize):
Transport.packet_hashlist.pop(0)
# Cull the reverse table according to max size and/or age of entries
# TODO: Implement this
# Cull the destination table in some way
# TODO: Implement this
except Exception as e:
RNS.log("An exception occurred while running Transport jobs.", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
traceback.print_exc()
Transport.jobs_running = False
for packet in outgoing:
packet.send()
@staticmethod
def outbound(packet):
while (Transport.jobs_running):
sleep(0.01)
Transport.jobs_locked = True
# TODO: This updateHash call might be redundant
packet.updateHash()
sent = False
# Check if we have a known path for the destination
# in the destination table
if packet.packet_type != RNS.Packet.ANNOUNCE and packet.destination_hash in Transport.destination_table:
outbound_interface = Transport.destination_table[packet.destination_hash][5]
if Transport.destination_table[packet.destination_hash][2] > 1:
# Insert packet into transport
new_flags = (RNS.Packet.HEADER_2) << 6 | (Transport.TRANSPORT) << 4 | (packet.flags & 0b00001111)
new_raw = struct.pack("!B", new_flags)
new_raw += packet.raw[1:2]
new_raw += Transport.destination_table[packet.destination_hash][1]
new_raw += packet.raw[2:]
# 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)
# RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_DEBUG)
outbound_interface.processOutgoing(new_raw)
sent = True
else:
# Destination is directly reachable, and we know on
# what interface, so transmit only on that one
RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(outbound_interface), RNS.LOG_EXTREME)
RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
outbound_interface.processOutgoing(packet.raw)
sent = True
else:
# Broadcast packet on all outgoing interfaces, or relevant
# interface, if packet is for a link
for interface in Transport.interfaces:
if interface.OUT:
should_transmit = True
if packet.destination.type == RNS.Destination.LINK:
if packet.destination.status == RNS.Link.CLOSED:
should_transmit = False
if interface != packet.destination.attached_interface:
should_transmit = False
else:
pass
if should_transmit:
RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(interface), RNS.LOG_EXTREME)
RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
interface.processOutgoing(packet.raw)
sent = True
if sent:
packet.sent = True
packet.sent_at = time.time()
if (packet.packet_type == RNS.Packet.DATA and packet.destination.type != RNS.Destination.PLAIN):
packet.receipt = RNS.PacketReceipt(packet)
Transport.receipts.append(packet.receipt)
Transport.cache(packet)
Transport.jobs_locked = False
return sent
@staticmethod
def packet_filter(packet):
# TODO: Think long and hard about this
if packet.context == RNS.Packet.KEEPALIVE:
return True
if packet.context == RNS.Packet.RESOURCE_REQ:
return True
if packet.context == RNS.Packet.RESOURCE_PRF:
return True
if not packet.packet_hash in Transport.packet_hashlist:
return True
else:
if packet.packet_type == RNS.Packet.ANNOUNCE:
return True
RNS.log("Filtered packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
return False
@staticmethod
def inbound(raw, interface=None):
# TODO: Rewrite the redundant cache calls in this method
while (Transport.jobs_running):
sleep(0.1)
Transport.jobs_locked = True
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 Transport.packet_filter(packet):
Transport.packet_hashlist.append(packet.packet_hash)
# General transport handling. Takes care of directing
# packets according to transport tables and recording
# entries in reverse and link tables.
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:]
else:
# 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:]
outbound_interface = Transport.destination_table[packet.destination_hash][5]
outbound_interface.processOutgoing(new_raw)
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)
else:
pass
# Link transport handling. Directs packetes according
# to entries in the link tables
if packet.packet_type != RNS.Packet.ANNOUNCE and packet.packet_type != RNS.Packet.LINKREQUEST:
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)
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 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
local_rebroadcasts = 0
block_rebroadcasts = False
random_blobs.append(random_blob)
retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW)
if packet.context != RNS.Packet.PATH_RESPONSE:
Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, packet.hops, packet, local_rebroadcasts, block_rebroadcasts]
Transport.destination_table[packet.destination_hash] = [now, received_from, packet.hops, expires, random_blobs, packet.receiving_interface, packet]
RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" is now "+str(packet.hops)+" hops away via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_DEBUG)
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)
Transport.cache(packet)
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)
Transport.cache(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)
Transport.cache(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()
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 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
# plaintext = link.decrypt(packet.data)
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 packet.destination_hash in Transport.reverse_table:
reverse_entry = Transport.reverse_table[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 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 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 pathRequestHandler(data, packet):
if len(data) >= RNS.Identity.TRUNCATED_HASHLENGTH/8:
Transport.pathRequest(data[:RNS.Identity.TRUNCATED_HASHLENGTH/8])
@staticmethod
def pathRequest(destination_hash):
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 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]
# Setting hops to 0xFF ensures announce is not rebroadcast by any local
# nodes, but requester will still see it and get a valid path
# TODO: Consider if there is a more elegant way to do this, or whether
# rebroadcasts should actually be allowed here
now = time.time()
retries = Transport.PATHFINDER_R
local_rebroadcasts = 0
block_rebroadcasts = True
retransmit_timeout = now + Transport.PATH_REQUEST_GRACE # + (RNS.rand() * Transport.PATHFINDER_RW)
Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, packet.hops, packet, local_rebroadcasts, block_rebroadcasts]
else:
RNS.log("No known path to requested destination, ignoring request", RNS.LOG_DEBUG)
@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)
Reference in New Issue View Git Blame Copy Permalink