Implemented basic multi-hop transport
This commit is contained in:
Mark Qvist
parent
03705372f8
commit
7867d7ded9
@ -20,10 +20,14 @@ class UdpInterface(Interface):
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self.bind_ip = bindip
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self.bind_port = bindport
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UdpInterfaceHandler.interface = self
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def handlerFactory(callback):
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def createHandler(*args, **keys):
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return UdpInterfaceHandler(callback, *args, **keys)
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return createHandler
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self.owner = owner
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address = (self.bind_ip, self.bind_port)
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self.server = SocketServer.UDPServer(address, UdpInterfaceHandler)
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self.server = SocketServer.UDPServer(address, handlerFactory(self.processIncoming))
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thread = threading.Thread(target=self.server.serve_forever)
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thread.setDaemon(True)
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@ -49,9 +53,10 @@ class UdpInterface(Interface):
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return "UdpInterface["+self.name+"/"+self.bind_ip+":"+str(self.bind_port)+"]"
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class UdpInterfaceHandler(SocketServer.BaseRequestHandler):
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interface = None
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def __init__(self, callback, *args, **keys):
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self.callback = callback
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SocketServer.BaseRequestHandler.__init__(self, *args, **keys)
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def handle(self):
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if (UdpInterfaceHandler.interface != None):
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data = self.request[0]
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UdpInterfaceHandler.interface.processIncoming(data)
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self.callback(data)
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@ -12,7 +12,7 @@ class Packet:
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# Header types
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HEADER_1 = 0x00 # Normal header format
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HEADER_2 = 0x01 # Header format used for link packets in transport
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HEADER_2 = 0x01 # Header format used for packets in transport
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HEADER_3 = 0x02 # Reserved
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HEADER_4 = 0x03 # Reserved
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header_types = [HEADER_1, HEADER_2, HEADER_3, HEADER_4]
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@ -85,6 +85,7 @@ class Packet:
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return packed_flags
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def pack(self):
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self.destination_hash = self.destination.hash
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self.header = ""
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self.header += struct.pack("!B", self.flags)
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self.header += struct.pack("!B", self.hops)
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@ -141,6 +142,7 @@ class Packet:
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raise IOError("Packet size of "+str(len(self.raw))+" exceeds MTU of "+str(self.MTU)+" bytes")
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self.packed = True
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self.updateHash()
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def unpack(self):
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self.flags = ord(self.raw[0])
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@ -163,6 +165,7 @@ class Packet:
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self.data = self.raw[13:]
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self.packed = False
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self.updateHash()
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def send(self):
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if not self.sent:
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@ -222,9 +225,13 @@ class Packet:
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return RNS.Identity.fullHash(self.getHashablePart())
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def getHashablePart(self):
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# TODO: This assumes transport headers are stripped
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# by Transport before going anywhere else
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return self.raw[0:1]+self.raw[2:]
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hashable_part = struct.pack("!B", struct.unpack("!B", self.raw[0])[0] & 0b00001111)
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if self.header_type == Packet.HEADER_2:
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hashable_part += self.raw[12:]
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else:
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hashable_part += self.raw[2:]
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return hashable_part
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class ProofDestination:
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def __init__(self, packet):
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@ -265,7 +265,6 @@ class Resource:
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expected_data = self.hash + self.expected_proof
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expected_proof_packet = RNS.Packet(self.link, expected_data, packet_type=RNS.Packet.PROOF, context=RNS.Packet.RESOURCE_PRF)
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expected_proof_packet.pack()
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expected_proof_packet.updateHash()
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RNS.Transport.cache_request(expected_proof_packet.packet_hash)
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self.last_part_sent = time.time()
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sleep_time = 0.001
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104
RNS/Transport.py
104
RNS/Transport.py
@ -2,6 +2,7 @@ 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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@ -41,6 +42,7 @@ class Transport:
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announce_table = {} # A table for storing announces currently waiting to be retransmitted
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destination_table = {} # A lookup table containing the next hop to a given destination
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reverse_table = {} # A lookup table for storing packet hashes used to return proofs and replies
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jobs_locked = False
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jobs_running = False
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@ -110,10 +112,6 @@ class Transport:
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if time.time() > Transport.announces_last_checked+Transport.announces_check_interval:
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for destination_hash in Transport.announce_table:
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announce_entry = Transport.announce_table[destination_hash]
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# TODO: remove comment and log output
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# [time_heard, retransmit_timeout, retries, received_from, packet.hops, packet]
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# RNS.log("Announce entry retries: "+str(announce_entry[2]), RNS.LOG_INFO)
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# RNS.log("Max retries: "+str(Transport.PATHFINDER_R), RNS.LOG_INFO)
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if announce_entry[2] > Transport.PATHFINDER_R:
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RNS.log("Dropping announce for "+RNS.prettyhexrep(destination_hash)+", retries exceeded", RNS.LOG_DEBUG)
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Transport.announce_table.pop(destination_hash)
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@ -140,6 +138,12 @@ class Transport:
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while (len(Transport.packet_hashlist) > Transport.hashlist_maxsize):
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Transport.packet_hashlist.pop(0)
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# Cull the reverse table according to max size and/or age of entries
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# TODO: Implement this
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# Cull the destination table in some way
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# TODO: Implement this
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except Exception as e:
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RNS.log("An exception occurred while running Transport jobs.", RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
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@ -156,9 +160,39 @@ class Transport:
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sleep(0.01)
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Transport.jobs_locked = True
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# TODO: This updateHash call might be redundant
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packet.updateHash()
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sent = False
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# Check if we have a known path for the destination
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# in the destination table
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if packet.packet_type != RNS.Packet.ANNOUNCE and packet.destination_hash in Transport.destination_table:
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outbound_interface = Transport.destination_table[packet.destination_hash][5]
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if Transport.destination_table[packet.destination_hash][2] > 1:
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# Insert packet into transport
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new_flags = (RNS.Packet.HEADER_2) << 6 | (Transport.TRANSPORT) << 4 | (packet.flags & 0b00001111)
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new_raw = struct.pack("!B", new_flags)
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new_raw += packet.raw[1:2]
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new_raw += Transport.destination_table[packet.destination_hash][1]
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new_raw += packet.raw[2:]
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# RNS.log("Transporting "+str(len(packet.raw))+" bytes via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
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# RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_DEBUG)
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outbound_interface.processOutgoing(new_raw)
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sent = True
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else:
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# Destination is directly reachable, and we know on
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# what interface, so transmit only on that one
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# TODO: Strip transport headers here
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RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(outbound_interface), RNS.LOG_EXTREME)
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RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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outbound_interface.processOutgoing(packet.raw)
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sent = True
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else:
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# Broadcast packet on all outgoing interfaces
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for interface in Transport.interfaces:
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if interface.OUT:
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should_transmit = True
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@ -169,8 +203,7 @@ class Transport:
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should_transmit = False
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if should_transmit:
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# TODO: Remove
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RNS.log("Transmitting "+str(len(packet.raw))+" bytes via: "+str(interface), RNS.LOG_EXTREME)
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RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(interface), RNS.LOG_EXTREME)
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RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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interface.processOutgoing(packet.raw)
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sent = True
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@ -199,11 +232,15 @@ class Transport:
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return True
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if not packet.packet_hash in Transport.packet_hashlist:
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return True
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else:
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if packet.packet_type == RNS.Packet.ANNOUNCE:
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return True
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return False
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@staticmethod
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def inbound(raw, interface=None):
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# TODO: Rewrite the redundant cache calls in this method
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while (Transport.jobs_running):
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sleep(0.1)
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@ -211,18 +248,44 @@ class Transport:
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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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packet.hops += 1
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RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
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# TODO: Rewrite these redundant cache calls
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if Transport.packet_filter(packet):
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Transport.packet_hashlist.append(packet.packet_hash)
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if packet.transport_id != None and packet.packet_type != RNS.Packet.ANNOUNCE:
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if packet.transport_id == Transport.identity.hash:
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RNS.log("Received packet in transport for "+RNS.prettyhexrep(packet.destination_hash)+" with matching transport ID, transporting it...", RNS.LOG_DEBUG)
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if packet.destination_hash in Transport.destination_table:
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next_hop = Transport.destination_table[packet.destination_hash][1]
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RNS.log("Packet hops: "+str(packet.hops), RNS.LOG_DEBUG)
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RNS.log("Next hop to destination is "+RNS.prettyhexrep(next_hop)+", transporting it.", RNS.LOG_DEBUG)
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new_raw = packet.raw[0:1]
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new_raw += struct.pack("!B", packet.hops)
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new_raw += next_hop
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new_raw += packet.raw[12:]
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outbound_interface = Transport.destination_table[packet.destination_hash][5]
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outbound_interface.processOutgoing(new_raw)
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Transport.reverse_table[packet.packet_hash[:10]] = [packet.receiving_interface, outbound_interface, time.time()]
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else:
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# TODO: There should probably be some kind of REJECT
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# mechanism here, to signal to the source that their
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# expected path failed
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RNS.log("Got packet in transport, but no known path to final destination. Dropping packet.", RNS.LOG_DEBUG)
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else:
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# TODO: Remove this log statement
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RNS.log("Received packet in transport, but transport ID doesn't match, not transporting it further.", RNS.LOG_DEBUG)
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# Announce handling. Handles logic related to incoming
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# announces, queueing rebroadcasts of these, and removal
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# of queued announce rebroadcasts once handed to the next node
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if packet.packet_type == RNS.Packet.ANNOUNCE:
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if RNS.Identity.validateAnnounce(packet):
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if (packet.transport_id != None):
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if packet.transport_id != None:
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received_from = packet.transport_id
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# Check if this is a next retransmission from
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@ -231,14 +294,14 @@ class Transport:
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if packet.destination_hash in Transport.announce_table:
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announce_entry = Transport.announce_table[packet.destination_hash]
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if packet.hops == announce_entry[4]:
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if packet.hops-1 == announce_entry[4]:
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RNS.log("Heard a local rebroadcast of announce for "+RNS.prettyhexrep(packet.destination_hash), RNS.LOG_DEBUG)
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announce_entry[6] += 1
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if announce_entry[6] >= Transport.LOCAL_REBROADCASTS_MAX:
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RNS.log("Max local rebroadcasts of announce for "+RNS.prettyhexrep(packet.destination_hash)+" reached, dropping announce from our table", RNS.LOG_DEBUG)
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Transport.announce_table.pop(packet.destination_hash)
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if packet.hops == announce_entry[4]+1 and announce_entry[2] > 0:
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if packet.hops-1 == announce_entry[4]+1 and announce_entry[2] > 0:
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now = time.time()
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if now < announce_entry[1]:
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RNS.log("Rebroadcasted announce for "+RNS.prettyhexrep(packet.destination_hash)+" has been passed on to next node, no further tries needed", RNS.LOG_DEBUG)
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@ -250,7 +313,7 @@ class Transport:
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# Check if this announce should be inserted into
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# announce and destination tables
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should_add = False
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packet.hops += 1
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# First, check that the announce is not for a destination
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# local to this system, and that hops are less than the max
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if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
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@ -302,7 +365,8 @@ class Transport:
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random_blobs.append(random_blob)
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retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW)
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Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, packet.hops, packet, local_rebroadcasts]
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Transport.destination_table[packet.destination_hash] = [now, received_from, packet.hops, expires, random_blobs]
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Transport.destination_table[packet.destination_hash] = [now, received_from, packet.hops, expires, random_blobs, packet.receiving_interface]
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RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" is now via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_DEBUG)
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elif packet.packet_type == RNS.Packet.LINKREQUEST:
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for destination in Transport.destinations:
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@ -358,6 +422,18 @@ class Transport:
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else:
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proof_hash = None
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# Check if this proof neds to be transported
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if packet.destination_hash in Transport.reverse_table:
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reverse_entry = Transport.reverse_table[packet.destination_hash]
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if packet.receiving_interface == reverse_entry[1]:
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RNS.log("Proof received on correct interface, transporting it via "+str(reverse_entry[0]), RNS.LOG_DEBUG)
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new_raw = packet.raw[0:1]
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new_raw += struct.pack("!B", packet.hops)
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new_raw += packet.raw[2:]
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reverse_entry[0].processOutgoing(new_raw)
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else:
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RNS.log("Proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG)
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for receipt in Transport.receipts:
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receipt_validated = False
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if proof_hash != None:
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@ -425,8 +501,6 @@ class Transport:
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def cache_request_packet(packet):
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if len(packet.data) == RNS.Identity.HASHLENGTH/8:
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packet_hash = RNS.hexrep(packet.data, delimit=False)
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# TODO: There's some pretty obvious file access
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# issues here. Make sure this can't happen
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path = RNS.Reticulum.cachepath+"/"+packet_hash
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if os.path.isfile(path):
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file = open(path, "r")
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