Reticulum/RNS/Transport.py
2018-04-21 16:12:42 +02:00

234 lines
7.0 KiB
Python
Executable File

import RNS
import time
import threading
from time import sleep
class Transport:
# Constants
BROADCAST = 0x00;
TRANSPORT = 0x01;
RELAY = 0x02;
TUNNEL = 0x03;
types = [BROADCAST, TRANSPORT, RELAY, TUNNEL]
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
jobs_locked = False
jobs_running = False
job_interval = 0.250
receipts_last_checked = 0.0
receipts_check_interval = 1.0
hashlist_maxsize = 1000000
@staticmethod
def scheduleJobs():
thread = threading.Thread(target=Transport.jobloop)
thread.setDaemon(True)
thread.start()
@staticmethod
def jobloop():
while (True):
Transport.jobs()
sleep(Transport.job_interval)
@staticmethod
def jobs():
Transport.jobs_running = True
try:
if not Transport.jobs_locked:
# Process receipts list for timed-out packets
if Transport.receipts_last_checked+Transport.receipts_check_interval < time.time():
for receipt in Transport.receipts:
receipt.checkTimeout()
if receipt.status != RNS.PacketReceipt.SENT:
Transport.receipts.remove(receipt)
Transport.receipts_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)
except Exception as e:
RNS.log("An exception occurred while running Transport jobs.", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
Transport.jobs_running = False
@staticmethod
def outbound(packet):
while (Transport.jobs_running):
sleep(0.1)
Transport.jobs_locked = True
packet.updateHash()
sent = False
for interface in Transport.interfaces:
if interface.OUT:
should_transmit = True
if packet.destination.type == RNS.Destination.LINK:
if packet.destination.status == RNS.Link.CLOSED:
should_transmit = False
if interface != packet.destination.attached_interface:
should_transmit = False
if should_transmit:
RNS.log("Transmitting "+str(len(packet.raw))+" bytes via: "+str(interface), RNS.LOG_DEBUG)
interface.processOutgoing(packet.raw)
sent = True
if sent:
packet.sent = True
packet.sent_at = time.time()
if (packet.packet_type == RNS.Packet.DATA):
packet.receipt = RNS.PacketReceipt(packet)
Transport.receipts.append(packet.receipt)
Transport.cache(packet)
Transport.jobs_locked = False
return sent
@staticmethod
def packet_filter(packet):
if packet.context == RNS.Packet.KEEPALIVE:
return True
if not packet.packet_hash in Transport.packet_hashlist:
return True
@staticmethod
def inbound(raw, interface=None):
while (Transport.jobs_running):
sleep(0.1)
Transport.jobs_locked = True
packet = RNS.Packet(None, raw)
packet.unpack()
packet.updateHash()
packet.receiving_interface = interface
RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
if Transport.packet_filter(packet):
Transport.packet_hashlist.append(packet.packet_hash)
if packet.packet_type == RNS.Packet.ANNOUNCE:
if RNS.Identity.validateAnnounce(packet):
Transport.cache(packet)
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()
if destination.proof_strategy == RNS.Destination.PROVE_APP:
if destination.callbacks.proof_requested:
destination.callbacks.proof_requested(packet)
elif packet.packet_type == RNS.Packet.PROOF:
if packet.context == RNS.Packet.LRPROOF:
# This is a link request proof, forward
# to a waiting link request
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:
# TODO: Make sure everything uses new proof handling
if len(packet.data) == RNS.PacketReceipt.EXPL_LENGTH:
proof_hash = packet.data[:RNS.Identity.HASHLENGTH/8]
else:
proof_hash = None
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))
if link.initiator:
Transport.pending_links.append(link)
else:
Transport.active_links.append(link)
@staticmethod
def activateLink(link):
RNS.log("Activating link "+str(link))
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
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_DEBUG)
except Exception as e:
RNS.log("Error writing packet to cache", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e))