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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
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 = 0.35 # Grace time before a path announcement is made, allows directly reachable peers to respond first
PATH_REQUEST_RW = 2 # Path request random window
LINK_TIMEOUT = RNS . Link . KEEPALIVE * 2
REVERSE_TIMEOUT = 30 * 60 # Reverse table entries are removed after max 30 minutes
DESTINATION_TIMEOUT = 60 * 60 * 24 * 7 # Destination table entries are removed if unused for one week
MAX_RECEIPTS = 1024 # Maximum number of receipts to keep track of
interfaces = [ ] # All active interfaces
destinations = [ ] # All active destinations
pending_links = [ ] # Links that are being established
active_links = [ ] # Links that are active
packet_hashlist = [ ] # A list of packet hashes for duplicate detection
receipts = [ ] # Receipts of all outgoing packets for proof processing
# TODO: "destination_table" should really be renamed to "path_table"
announce_table = { } # A table for storing announces currently waiting to be retransmitted
destination_table = { } # A lookup table containing the next hop to a given destination
reverse_table = { } # A lookup table for storing packet hashes used to return proofs and replies
link_table = { } # A lookup table containing hops for links
held_announces = { } # A table containing temporarily held announce-table entries
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announce_handlers = [ ] # A table storing externally registered announce handlers
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# Transport control destinations are used
# for control purposes like path requests
control_destinations = [ ]
control_hashes = [ ]
# Interfaces for communicating with
# local clients connected to a shared
# Reticulum instance
local_client_interfaces = [ ]
jobs_locked = False
jobs_running = False
job_interval = 0.250
receipts_last_checked = 0.0
receipts_check_interval = 1.0
announces_last_checked = 0.0
announces_check_interval = 1.0
hashlist_maxsize = 1000000
tables_last_culled = 0.0
tables_cull_interval = 5.0
identity = None
@staticmethod
def start ( reticulum_instance ) :
Transport . owner = reticulum_instance
if Transport . identity == None :
transport_identity_path = RNS . Reticulum . storagepath + " /transport_identity "
if os . path . isfile ( transport_identity_path ) :
Transport . identity = RNS . Identity . from_file ( transport_identity_path )
if Transport . identity == None :
RNS . log ( " No valid Transport Identity in storage, creating... " , RNS . LOG_VERBOSE )
Transport . identity = RNS . Identity ( )
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Transport . identity . to_file ( transport_identity_path )
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else :
RNS . log ( " Loaded Transport Identity from storage " , RNS . LOG_VERBOSE )
packet_hashlist_path = RNS . Reticulum . storagepath + " /packet_hashlist "
if os . path . isfile ( packet_hashlist_path ) :
try :
file = open ( packet_hashlist_path , " rb " )
Transport . packet_hashlist = umsgpack . unpackb ( file . read ( ) )
file . close ( )
except Exception as e :
RNS . log ( " Could not load packet hashlist from storage, the contained exception was: " + str ( e ) , RNS . LOG_ERROR )
# Create transport-specific destinations
Transport . path_request_destination = RNS . Destination ( None , RNS . Destination . IN , RNS . Destination . PLAIN , Transport . APP_NAME , " path " , " request " )
Transport . path_request_destination . packet_callback ( Transport . path_request_handler )
Transport . control_destinations . append ( Transport . path_request_destination )
Transport . control_hashes . append ( Transport . path_request_destination . hash )
thread = threading . Thread ( target = Transport . jobloop )
thread . setDaemon ( True )
thread . start ( )
if RNS . Reticulum . transport_enabled ( ) :
destination_table_path = RNS . Reticulum . storagepath + " /destination_table "
if os . path . isfile ( destination_table_path ) and not Transport . owner . is_connected_to_shared_instance :
serialised_destinations = [ ]
try :
file = open ( destination_table_path , " rb " )
serialised_destinations = umsgpack . unpackb ( file . read ( ) )
file . close ( )
for serialised_entry in serialised_destinations :
destination_hash = serialised_entry [ 0 ]
timestamp = serialised_entry [ 1 ]
received_from = serialised_entry [ 2 ]
hops = serialised_entry [ 3 ]
expires = serialised_entry [ 4 ]
random_blobs = serialised_entry [ 5 ]
receiving_interface = Transport . find_interface_from_hash ( serialised_entry [ 6 ] )
announce_packet = Transport . get_cached_packet ( serialised_entry [ 7 ] )
if announce_packet != None and receiving_interface != None :
announce_packet . unpack ( )
# We increase the hops, since reading a packet
# from cache is equivalent to receiving it again
# over an interface. It is cached with it's non-
# increased hop-count.
announce_packet . hops + = 1
Transport . destination_table [ destination_hash ] = [ timestamp , received_from , hops , expires , random_blobs , receiving_interface , announce_packet ]
RNS . log ( " Loaded path table entry for " + RNS . prettyhexrep ( destination_hash ) + " from storage " , RNS . LOG_DEBUG )
else :
RNS . log ( " Could not reconstruct path table entry from storage for " + RNS . prettyhexrep ( destination_hash ) , RNS . LOG_DEBUG )
if announce_packet == None :
RNS . log ( " The announce packet could not be loaded from cache " , RNS . LOG_DEBUG )
if receiving_interface == None :
RNS . log ( " The interface is no longer available " , RNS . LOG_DEBUG )
if len ( Transport . destination_table ) == 1 :
specifier = " entry "
else :
specifier = " entries "
RNS . log ( " Loaded " + str ( len ( Transport . destination_table ) ) + " path table " + specifier + " from storage " , RNS . LOG_VERBOSE )
except Exception as e :
RNS . log ( " Could not load destination table from storage, the contained exception was: " + str ( e ) , RNS . LOG_ERROR )
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 :
while len ( Transport . receipts ) > Transport . MAX_RECEIPTS :
culled_receipt = Transport . receipts . pop ( 0 )
culled_receipt . timeout = - 1
receipt . check_timeout ( )
for receipt in Transport . receipts :
receipt . check_timeout ( )
if receipt . status != RNS . PacketReceipt . SENT :
Transport . receipts . remove ( receipt )
Transport . receipts_last_checked = time . time ( )
# Process announces needing retransmission
if time . time ( ) > Transport . announces_last_checked + Transport . announces_check_interval :
for destination_hash in Transport . announce_table :
announce_entry = Transport . announce_table [ destination_hash ]
if announce_entry [ 2 ] > Transport . PATHFINDER_R :
RNS . log ( " Dropping announce for " + RNS . prettyhexrep ( destination_hash ) + " , retries exceeded " , RNS . LOG_DEBUG )
Transport . announce_table . pop ( destination_hash )
break
else :
if time . time ( ) > announce_entry [ 1 ] :
announce_entry [ 1 ] = time . time ( ) + math . pow ( Transport . PATHFINDER_C , announce_entry [ 4 ] ) + Transport . PATHFINDER_T + Transport . PATHFINDER_RW
announce_entry [ 2 ] + = 1
packet = announce_entry [ 5 ]
block_rebroadcasts = announce_entry [ 7 ]
attached_interface = announce_entry [ 8 ]
announce_context = RNS . Packet . NONE
if block_rebroadcasts :
announce_context = RNS . Packet . PATH_RESPONSE
announce_data = packet . data
announce_identity = RNS . Identity . recall ( packet . destination_hash )
announce_destination = RNS . Destination ( announce_identity , RNS . Destination . OUT , RNS . Destination . SINGLE , " unknown " , " unknown " ) ;
announce_destination . hash = packet . destination_hash
announce_destination . hexhash = announce_destination . hash . hex ( )
new_packet = RNS . Packet (
announce_destination ,
announce_data ,
RNS . Packet . ANNOUNCE ,
context = announce_context ,
header_type = RNS . Packet . HEADER_2 ,
transport_type = Transport . TRANSPORT ,
transport_id = Transport . identity . hash ,
attached_interface = attached_interface
)
new_packet . hops = announce_entry [ 4 ]
if block_rebroadcasts :
RNS . log ( " Rebroadcasting announce as path response for " + RNS . prettyhexrep ( announce_destination . hash ) + " with hop count " + str ( new_packet . hops ) , RNS . LOG_DEBUG )
else :
RNS . log ( " Rebroadcasting announce for " + RNS . prettyhexrep ( announce_destination . hash ) + " with hop count " + str ( new_packet . hops ) , RNS . LOG_DEBUG )
outgoing . append ( new_packet )
# This handles an edge case where a peer sends a past
# request for a destination just after an announce for
# said destination has arrived, but before it has been
# rebroadcast locally. In such a case the actual announce
# is temporarily held, and then reinserted when the path
# request has been served to the peer.
if destination_hash in Transport . held_announces :
held_entry = Transport . held_announces . pop ( destination_hash )
Transport . announce_table [ destination_hash ] = held_entry
RNS . log ( " Reinserting held announce into table " , RNS . LOG_DEBUG )
Transport . announces_last_checked = time . time ( )
# Cull the packet hashlist if it has reached max size
while ( len ( Transport . packet_hashlist ) > Transport . hashlist_maxsize ) :
Transport . packet_hashlist . pop ( 0 )
if time . time ( ) > Transport . tables_last_culled + Transport . tables_cull_interval :
# Cull the reverse table according to timeout
for truncated_packet_hash in Transport . reverse_table :
reverse_entry = Transport . reverse_table [ truncated_packet_hash ]
if time . time ( ) > reverse_entry [ 2 ] + Transport . REVERSE_TIMEOUT :
Transport . reverse_table . pop ( truncated_packet_hash )
# Cull the link table according to timeout
stale_links = [ ]
for link_id in Transport . link_table :
link_entry = Transport . link_table [ link_id ]
if time . time ( ) > link_entry [ 0 ] + Transport . LINK_TIMEOUT :
stale_links . append ( link_id )
# Cull the path table
stale_paths = [ ]
for destination_hash in Transport . destination_table :
destination_entry = Transport . destination_table [ destination_hash ]
attached_interface = destination_entry [ 5 ]
if time . time ( ) > destination_entry [ 0 ] + Transport . DESTINATION_TIMEOUT :
stale_paths . append ( destination_hash )
RNS . log ( " Path to " + RNS . prettyhexrep ( destination_hash ) + " timed out and was removed " , RNS . LOG_DEBUG )
if not attached_interface in Transport . interfaces :
stale_paths . append ( destination_hash )
RNS . log ( " Path to " + RNS . prettyhexrep ( destination_hash ) + " was removed since the attached interface no longer exists " , RNS . LOG_DEBUG )
i = 0
for link_id in stale_links :
Transport . link_table . pop ( link_id )
i + = 1
if i > 0 :
if i == 1 :
RNS . log ( " Dropped " + str ( i ) + " link " , RNS . LOG_DEBUG )
else :
RNS . log ( " Dropped " + str ( i ) + " links " , RNS . LOG_DEBUG )
i = 0
for destination_hash in stale_paths :
Transport . destination_table . pop ( destination_hash )
i + = 1
if i > 0 :
if i == 1 :
RNS . log ( " Removed " + str ( i ) + " path " , RNS . LOG_DEBUG )
else :
RNS . log ( " Removed " + str ( i ) + " paths " , RNS . LOG_DEBUG )
Transport . tables_last_culled = time . time ( )
except Exception as e :
RNS . log ( " An exception occurred while running Transport jobs. " , RNS . LOG_ERROR )
RNS . log ( " The contained exception was: " + str ( e ) , RNS . LOG_ERROR )
traceback . print_exc ( )
Transport . jobs_running = False
for packet in outgoing :
packet . send ( )
@staticmethod
def outbound ( packet ) :
while ( Transport . jobs_running ) :
sleep ( 0.01 )
Transport . jobs_locked = True
# TODO: This updateHash call might be redundant
packet . updateHash ( )
sent = False
# Check if we have a known path for the destination in the path table
if packet . packet_type != RNS . Packet . ANNOUNCE and packet . destination_hash in Transport . destination_table :
outbound_interface = Transport . destination_table [ packet . destination_hash ] [ 5 ]
# If there's more than one hop to the destination, and we know
# a path, we insert the packet into transport by adding the next
# transport nodes address to the header, and modifying the flags.
# This rule applies both for "normal" transport, and when connected
# to a local shared Reticulum instance.
if Transport . destination_table [ packet . destination_hash ] [ 2 ] > 1 :
if packet . header_type == RNS . Packet . HEADER_1 :
# Insert packet into transport
new_flags = ( RNS . Packet . HEADER_2 ) << 6 | ( Transport . TRANSPORT ) << 4 | ( packet . flags & 0b00001111 )
new_raw = struct . pack ( " !B " , new_flags )
new_raw + = packet . raw [ 1 : 2 ]
new_raw + = Transport . destination_table [ packet . destination_hash ] [ 1 ]
new_raw + = packet . raw [ 2 : ]
# TODO: Remove at some point
# RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
outbound_interface . processOutgoing ( new_raw )
Transport . destination_table [ packet . destination_hash ] [ 0 ] = time . time ( )
sent = True
# In the special case where we are connected to a local shared
# Reticulum instance, and the destination is one hop away, we
# also add transport headers to inject the packet into transport
# via the shared instance. Normally a packet for a destination
# one hop away would just be broadcast directly, but since we
# are "behind" a shared instance, we need to get that instance
# to transport it onto the network.
elif Transport . destination_table [ packet . destination_hash ] [ 2 ] == 1 and Transport . owner . is_connected_to_shared_instance :
if packet . header_type == RNS . Packet . HEADER_1 :
# Insert packet into transport
new_flags = ( RNS . Packet . HEADER_2 ) << 6 | ( Transport . TRANSPORT ) << 4 | ( packet . flags & 0b00001111 )
new_raw = struct . pack ( " !B " , new_flags )
new_raw + = packet . raw [ 1 : 2 ]
new_raw + = Transport . destination_table [ packet . destination_hash ] [ 1 ]
new_raw + = packet . raw [ 2 : ]
# TODO: Remove at some point
# RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
outbound_interface . processOutgoing ( new_raw )
Transport . destination_table [ packet . destination_hash ] [ 0 ] = time . time ( )
sent = True
# If none of the above applies, we know the destination is
# directly reachable, and also on which interface, so we
# simply transmit the packet directly on that one.
else :
outbound_interface . processOutgoing ( packet . raw )
sent = True
# If we don't have a known path for the destination, we'll
# broadcast the packet on all outgoing interfaces, or the
# just the relevant interface if the packet has an attached
# interface, or belongs to a link.
else :
for interface in Transport . interfaces :
if interface . OUT :
should_transmit = True
if packet . destination . type == RNS . Destination . LINK :
if packet . destination . status == RNS . Link . CLOSED :
should_transmit = False
if interface != packet . destination . attached_interface :
should_transmit = False
if packet . attached_interface != None and interface != packet . attached_interface :
should_transmit = False
if should_transmit :
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 ( )
# Don't generate receipt if it has been explicitly disabled
if ( packet . create_receipt == True and
# Only generate receipts for DATA packets
packet . packet_type == RNS . Packet . DATA and
# Don't generate receipts for PLAIN destinations
packet . destination . type != RNS . Destination . PLAIN and
# Don't generate receipts for link-related packets
not ( packet . context > = RNS . Packet . KEEPALIVE and packet . context < = RNS . Packet . LRPROOF ) and
# Don't generate receipts for resource packets
not ( packet . context > = RNS . Packet . RESOURCE and packet . context < = RNS . Packet . RESOURCE_RCL ) ) :
packet . receipt = RNS . PacketReceipt ( packet )
Transport . receipts . append ( packet . receipt )
Transport . cache ( packet )
Transport . jobs_locked = False
return sent
@staticmethod
def packet_filter ( packet ) :
# TODO: Think long and hard about this.
# Is it even strictly necessary with the current
# transport rules?
if packet . context == RNS . Packet . KEEPALIVE :
return True
if packet . context == RNS . Packet . RESOURCE_REQ :
return True
if packet . context == RNS . Packet . RESOURCE_PRF :
return True
if packet . context == RNS . Packet . RESOURCE :
return True
if packet . context == RNS . Packet . CACHE_REQUEST :
return True
if packet . destination_type == RNS . Destination . PLAIN :
return True
if not packet . packet_hash in Transport . packet_hashlist :
return True
else :
if packet . packet_type == RNS . Packet . ANNOUNCE :
return True
RNS . log ( " Filtered packet with hash " + RNS . prettyhexrep ( packet . packet_hash ) , RNS . LOG_DEBUG )
return False
@staticmethod
def inbound ( raw , interface = None ) :
while ( Transport . jobs_running ) :
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# TODO: Decrease this for performance
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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 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 )
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if local_destination == None and RNS . Identity . validate_announce ( packet ) :
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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 )
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# Call externally registered callbacks from apps
# wanting to know when an announce arrives
for handler in Transport . announce_handlers :
try :
# Check that the announced destination matches
# the handlers aspect filter
execute_callback = False
if handler . aspect_filter == None :
# If the handlers aspect filter is set to
# None, we execute the callback in all cases
execute_callback = True
else :
announce_identity = RNS . Identity . recall ( packet . destination_hash )
handler_expected_hash = RNS . Destination . hash_from_name_and_identity ( handler . aspect_filter , announce_identity )
if packet . destination_hash == handler_expected_hash :
execute_callback = True
if execute_callback :
handler . received_announce (
destination_hash = packet . destination_hash ,
announced_identity = announce_identity ,
app_data = RNS . Identity . recall_app_data ( packet . destination_hash )
)
except Exception as e :
RNS . log ( " Error while processing external announce callback. " , RNS . LOG_ERROR )
RNS . log ( " The contained exception was: " + str ( e ) , RNS . LOG_ERROR )
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# 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 :
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link . validate_proof ( packet )
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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 :
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receipt_validated = receipt . validate_proof_packet ( packet )
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else :
# In case of an implicit proof, we have
# to check every single outstanding receipt
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receipt_validated = receipt . validate_proof_packet ( packet )
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if receipt_validated :
Transport . receipts . remove ( receipt )
Transport . jobs_locked = False
@staticmethod
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def register_destination ( destination ) :
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destination . MTU = RNS . Reticulum . MTU
if destination . direction == RNS . Destination . IN :
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for registered_destination in Transport . destinations :
if destination . hash == registered_destination . hash :
raise KeyError ( " Attempt to register an already registered destination. " )
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Transport . destinations . append ( destination )
@staticmethod
def deregister_destination ( destination ) :
if destination in Transport . destinations :
Transport . destinations . remove ( destination )
@staticmethod
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def register_link ( link ) :
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RNS . log ( " Registering link " + str ( link ) , RNS . LOG_DEBUG )
if link . initiator :
Transport . pending_links . append ( link )
else :
Transport . active_links . append ( link )
@staticmethod
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def activate_link ( link ) :
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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 )
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@staticmethod
def register_announce_handler ( handler ) :
if hasattr ( handler , " received_announce " ) and callable ( handler . received_announce ) :
if hasattr ( handler , " aspect_filter " ) :
Transport . announce_handlers . append ( handler )
@staticmethod
def deregister_announce_handler ( handler ) :
while handler in Transport . announce_handlers :
Transport . announce_handlers . remove ( handler )
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@staticmethod
def find_interface_from_hash ( interface_hash ) :
for interface in Transport . interfaces :
if interface . get_hash ( ) == interface_hash :
return interface
return None
@staticmethod
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def should_cache ( packet ) :
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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 ) :
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if RNS . Transport . should_cache ( packet ) or force_cache :
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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
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def has_path ( destination_hash ) :
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if destination_hash in Transport . destination_table :
return True
else :
return False
@staticmethod
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def request_path ( destination_hash ) :
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path_request_data = destination_hash + RNS . Identity . get_random_hash ( )
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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
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def request_path_on_interface ( destination_hash , interface ) :
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path_request_data = destination_hash + RNS . Identity . get_random_hash ( )
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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 :
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Transport . path_request (
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data [ : RNS . Identity . TRUNCATED_HASHLENGTH / / 8 ] ,
Transport . from_local_client ( packet ) ,
packet . receiving_interface
)
@staticmethod
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def path_request ( destination_hash , is_from_local_client , attached_interface ) :
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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 :
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Transport . request_path_on_interface ( destination_hash , interface )
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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 :
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Transport . request_path_on_interface ( destination_hash , interface )
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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
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def exit_handler ( ) :
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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 ( )
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RNS . log ( " Done saving " + str ( len ( serialised_destinations ) ) + " path table entries to storage " , RNS . LOG_VERBOSE )
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except Exception as e :
RNS . log ( " Could not save path table to storage, the contained exception was: " + str ( e ) , RNS . LOG_ERROR )
