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Proof handling

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This commit is contained in:
Mark Qvist 2018-04-17 17:46:48 +02:00
parent dedea6ba11
commit 19d9b1a4a5
9 changed files with 283 additions and 58 deletions
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153
RNS/Transport.py
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@ -1,4 +1,7 @@
import RNS
import time
import threading
from time import sleep
class Transport:
# Constants
@ -8,15 +11,65 @@ class Transport:
TUNNEL = 0x03;
types = [BROADCAST, TRANSPORT, RELAY, TUNNEL]
interfaces = []
destinations = []
pending_links = []
active_links = []
packet_hashlist = []
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):
Transport.cacheRaw(packet.raw)
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
@ -27,19 +80,38 @@ class Transport:
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 inbound(raw, interface=None):
packet_hash = RNS.Identity.fullHash(raw)
RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet_hash), RNS.LOG_DEBUG)
while (Transport.jobs_running):
sleep(0.1)
Transport.jobs_locked = True
packet = RNS.Packet(None, raw)
packet.unpack()
packet.updateHash()
packet.receiving_interface = interface
if not packet_hash in Transport.packet_hashlist:
Transport.packet_hashlist.append(packet_hash)
packet = RNS.Packet(None, raw)
packet.unpack()
packet.packet_hash = packet_hash
packet.receiving_interface = interface
RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_DEBUG)
if not packet.packet_hash in Transport.packet_hashlist:
Transport.packet_hashlist.append(packet.packet_hash)
if packet.packet_type == RNS.Packet.ANNOUNCE:
if RNS.Identity.validateAnnounce(packet):
Transport.cache(packet)
@ -64,6 +136,13 @@ class Transport:
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)
if packet.packet_type == RNS.Packet.PROOF:
if packet.header_type == RNS.Packet.HEADER_3:
# This is a link request proof, forward
@ -72,11 +151,27 @@ class Transport:
if link.link_id == packet.destination_hash:
link.validateProof(packet)
else:
for destination in Transport.destinations:
if destination.hash == packet.destination_hash:
if destination.proofcallback != None:
destination.proofcallback(packet)
# TODO: add universal proof handling
# 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):
@ -112,15 +207,13 @@ class Transport:
@staticmethod
def cache(packet):
if RNS.Transport.shouldCache(packet):
RNS.Transport.cacheRaw(packet.raw)
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))
@staticmethod
def cacheRaw(raw):
try:
file = open(RNS.Reticulum.cachepath+"/"+RNS.hexrep(RNS.Identity.fullHash(raw), delimit=False), "w")
file.write(raw)
file.close()
RNS.log("Wrote packet "+RNS.prettyhexrep(RNS.Identity.fullHash(raw))+" 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))