234 lines
7.0 KiB
Python
Executable File
234 lines
7.0 KiB
Python
Executable File
import RNS
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import time
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import threading
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from time import sleep
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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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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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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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hashlist_maxsize = 1000000
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@staticmethod
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def scheduleJobs():
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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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@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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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 Transport.receipts_last_checked+Transport.receipts_check_interval < time.time():
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for receipt in Transport.receipts:
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receipt.checkTimeout()
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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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# 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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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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Transport.jobs_running = False
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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(0.1)
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Transport.jobs_locked = True
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packet.updateHash()
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sent = False
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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 via: "+str(interface), RNS.LOG_DEBUG)
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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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if packet.context == RNS.Packet.KEEPALIVE:
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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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@staticmethod
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def inbound(raw, interface=None):
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while (Transport.jobs_running):
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sleep(0.1)
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Transport.jobs_locked = True
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packet = RNS.Packet(None, raw)
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packet.unpack()
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packet.updateHash()
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packet.receiving_interface = interface
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RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
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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.packet_type == RNS.Packet.ANNOUNCE:
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if RNS.Identity.validateAnnounce(packet):
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Transport.cache(packet)
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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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if destination.proof_strategy == RNS.Destination.PROVE_APP:
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if destination.callbacks.proof_requested:
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destination.callbacks.proof_requested(packet)
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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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# 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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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:
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Transport.receipts.remove(receipt)
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Transport.jobs_locked = False
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@staticmethod
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def registerDestination(destination):
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destination.MTU = RNS.Reticulum.MTU
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if destination.direction == RNS.Destination.IN:
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Transport.destinations.append(destination)
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@staticmethod
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def registerLink(link):
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RNS.log("Registering link "+str(link))
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if link.initiator:
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Transport.pending_links.append(link)
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else:
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Transport.active_links.append(link)
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@staticmethod
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def activateLink(link):
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RNS.log("Activating link "+str(link))
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if link in Transport.pending_links:
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Transport.pending_links.remove(link)
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Transport.active_links.append(link)
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link.status = RNS.Link.ACTIVE
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else:
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RNS.log("Attempted to activate a link that was not in the pending table", RNS.LOG_ERROR)
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@staticmethod
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def shouldCache(packet):
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# TODO: Implement sensible rules for which
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# packets to cache
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return False
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@staticmethod
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def cache(packet):
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if RNS.Transport.shouldCache(packet):
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try:
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packet_hash = RNS.hexrep(packet.getHash(), delimit=False)
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file = open(RNS.Reticulum.cachepath+"/"+packet_hash, "w")
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file.write(packet.raw)
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file.close()
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RNS.log("Wrote packet "+packet_hash+" to cache", RNS.LOG_DEBUG)
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except Exception as e:
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RNS.log("Error writing packet to cache", RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e))
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