mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-12-22 20:00:18 +00:00
Implemented link timeouts and keepalive
This commit is contained in:
Mark Qvist
parent
98a489ee11
commit
260f8bbaf1
157
RNS/Link.py
157
RNS/Link.py
@ -4,7 +4,9 @@ from cryptography.hazmat.primitives import serialization
|
||||
from cryptography.hazmat.primitives.asymmetric import ec
|
||||
from cryptography.hazmat.primitives.kdf.hkdf import HKDF
|
||||
from cryptography.fernet import Fernet
|
||||
from time import sleep
|
||||
import vendor.umsgpack as umsgpack
|
||||
import threading
|
||||
import base64
|
||||
import time
|
||||
import RNS
|
||||
@ -24,12 +26,23 @@ class Link:
|
||||
ECPUBSIZE = 91
|
||||
BLOCKSIZE = 16
|
||||
|
||||
# TODO: This should not be hardcoded,
|
||||
# but calculated from something like
|
||||
# first-hop RTT latency and distance
|
||||
PROOF_TIMEOUT = 10
|
||||
TIMEOUT_FACTOR = 4
|
||||
KEEPALIVE = 120
|
||||
|
||||
PENDING = 0x00
|
||||
HANDSHAKE = 0x01
|
||||
ACTIVE = 0x02
|
||||
STALE = 0x03
|
||||
CLOSED = 0x04
|
||||
|
||||
TIMEOUT = 0x01
|
||||
INITIATOR_CLOSED = 0x02
|
||||
DESTINATION_CLOSED = 0x03
|
||||
|
||||
ACCEPT_NONE = 0x00
|
||||
ACCEPT_APP = 0x01
|
||||
ACCEPT_ALL = 0x02
|
||||
@ -47,6 +60,9 @@ class Link:
|
||||
link.prove()
|
||||
link.request_time = time.time()
|
||||
RNS.Transport.registerLink(link)
|
||||
link.last_inbound = time.time()
|
||||
link.start_watchdog()
|
||||
|
||||
if link.owner.callbacks.link_established != None:
|
||||
link.owner.callbacks.link_established(link)
|
||||
RNS.log("Incoming link request "+str(link)+" accepted", RNS.LOG_VERBOSE)
|
||||
@ -69,6 +85,16 @@ class Link:
|
||||
self.resource_strategy = Link.ACCEPT_NONE
|
||||
self.outgoing_resources = []
|
||||
self.incoming_resources = []
|
||||
self.last_inbound = 0
|
||||
self.last_outbound = 0
|
||||
self.tx = 0
|
||||
self.rx = 0
|
||||
self.txbytes = 0
|
||||
self.rxbytes = 0
|
||||
self.proof_timeout = Link.PROOF_TIMEOUT
|
||||
self.timeout_factor = Link.TIMEOUT_FACTOR
|
||||
self.keepalive = Link.KEEPALIVE
|
||||
self.watchdog_lock = False
|
||||
self.status = Link.PENDING
|
||||
self.type = RNS.Destination.LINK
|
||||
self.owner = owner
|
||||
@ -100,6 +126,7 @@ class Link:
|
||||
self.setLinkID(self.packet)
|
||||
RNS.Transport.registerLink(self)
|
||||
self.request_time = time.time()
|
||||
self.start_watchdog()
|
||||
self.packet.send()
|
||||
RNS.log("Link request "+RNS.prettyhexrep(self.link_id)+" sent to "+str(self.destination), RNS.LOG_VERBOSE)
|
||||
|
||||
@ -133,29 +160,30 @@ class Link:
|
||||
proof.send()
|
||||
|
||||
def validateProof(self, packet):
|
||||
peer_pub_bytes = packet.data[:Link.ECPUBSIZE]
|
||||
signed_data = self.link_id+peer_pub_bytes
|
||||
signature = packet.data[Link.ECPUBSIZE:RNS.Identity.KEYSIZE/8+Link.ECPUBSIZE]
|
||||
if self.initiator:
|
||||
peer_pub_bytes = packet.data[:Link.ECPUBSIZE]
|
||||
signed_data = self.link_id+peer_pub_bytes
|
||||
signature = packet.data[Link.ECPUBSIZE:RNS.Identity.KEYSIZE/8+Link.ECPUBSIZE]
|
||||
|
||||
if self.destination.identity.validate(signature, signed_data):
|
||||
self.loadPeer(peer_pub_bytes)
|
||||
self.handshake()
|
||||
self.rtt = time.time() - self.request_time
|
||||
self.attached_interface = packet.receiving_interface
|
||||
RNS.Transport.activateLink(self)
|
||||
RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(self.rtt), RNS.LOG_VERBOSE)
|
||||
rtt_data = umsgpack.packb(self.rtt)
|
||||
rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT)
|
||||
rtt_packet.send()
|
||||
if self.destination.identity.validate(signature, signed_data):
|
||||
self.loadPeer(peer_pub_bytes)
|
||||
self.handshake()
|
||||
self.rtt = time.time() - self.request_time
|
||||
self.attached_interface = packet.receiving_interface
|
||||
RNS.Transport.activateLink(self)
|
||||
RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(self.rtt), RNS.LOG_VERBOSE)
|
||||
rtt_data = umsgpack.packb(self.rtt)
|
||||
rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT)
|
||||
rtt_packet.send()
|
||||
|
||||
self.status = Link.ACTIVE
|
||||
if self.callbacks.link_established != None:
|
||||
self.callbacks.link_established(self)
|
||||
else:
|
||||
RNS.log("Invalid link proof signature received by "+str(self), RNS.LOG_VERBOSE)
|
||||
# TODO: should we really do this, or just wait
|
||||
# for a valid one? Needs analysis.
|
||||
self.teardown()
|
||||
self.status = Link.ACTIVE
|
||||
if self.callbacks.link_established != None:
|
||||
self.callbacks.link_established(self)
|
||||
else:
|
||||
RNS.log("Invalid link proof signature received by "+str(self), RNS.LOG_VERBOSE)
|
||||
# TODO: should we really do this, or just wait
|
||||
# for a valid one? Needs analysis.
|
||||
self.teardown()
|
||||
|
||||
|
||||
def rtt_packet(self, packet):
|
||||
@ -168,7 +196,6 @@ class Link:
|
||||
measured_rtt = time.time() - self.request_time
|
||||
plaintext = self.decrypt(packet.data)
|
||||
rtt = umsgpack.unpackb(plaintext)
|
||||
#RNS.log("Measured RTT is "+str(measured_rtt)+", received RTT is "+str(rtt))
|
||||
self.rtt = max(measured_rtt, rtt)
|
||||
self.status = Link.ACTIVE
|
||||
except Exception as e:
|
||||
@ -185,6 +212,10 @@ class Link:
|
||||
teardown_packet = RNS.Packet(self, self.link_id, context=RNS.Packet.LINKCLOSE)
|
||||
teardown_packet.send()
|
||||
self.status = Link.CLOSED
|
||||
if self.initiator:
|
||||
self.teardown_reason = Link.INITIATOR_CLOSED
|
||||
else:
|
||||
self.teardown_reason = Link.DESTINATION_CLOSED
|
||||
self.link_closed()
|
||||
|
||||
def teardown_packet(self, packet):
|
||||
@ -192,6 +223,10 @@ class Link:
|
||||
plaintext = self.decrypt(packet.data)
|
||||
if plaintext == self.link_id:
|
||||
self.status = Link.CLOSED
|
||||
if self.initiator:
|
||||
self.teardown_reason = Link.DESTINATION_CLOSED
|
||||
else:
|
||||
self.teardown_reason = Link.INITIATOR_CLOSED
|
||||
self.link_closed()
|
||||
except Exception as e:
|
||||
pass
|
||||
@ -206,12 +241,80 @@ class Link:
|
||||
if self.callbacks.link_closed != None:
|
||||
self.callbacks.link_closed(self)
|
||||
|
||||
def start_watchdog(self):
|
||||
thread = threading.Thread(target=self.__watchdog_job)
|
||||
thread.setDaemon(True)
|
||||
thread.start()
|
||||
|
||||
def __watchdog_job(self):
|
||||
while not self.status == Link.CLOSED:
|
||||
while (self.watchdog_lock):
|
||||
sleep(max(self.rtt, 0.025))
|
||||
|
||||
if not self.status == Link.CLOSED:
|
||||
# Link was initiated, but no response
|
||||
# from destination yet
|
||||
if self.status == Link.PENDING:
|
||||
next_check = self.request_time + self.proof_timeout
|
||||
sleep_time = next_check - time.time()
|
||||
if time.time() >= self.request_time + self.proof_timeout:
|
||||
RNS.log("Link establishment timed out", RNS.LOG_VERBOSE)
|
||||
self.status = Link.CLOSED
|
||||
self.teardown_reason = Link.TIMEOUT
|
||||
self.link_closed()
|
||||
sleep_time = 0.001
|
||||
|
||||
elif self.status == Link.HANDSHAKE:
|
||||
next_check = self.request_time + self.proof_timeout
|
||||
sleep_time = next_check - time.time()
|
||||
if time.time() >= self.request_time + self.proof_timeout:
|
||||
RNS.log("Timeout waiting for RTT packet from link initiator", RNS.LOG_VERBOSE)
|
||||
self.status = Link.CLOSED
|
||||
self.teardown_reason = Link.TIMEOUT
|
||||
self.link_closed()
|
||||
sleep_time = 0.001
|
||||
|
||||
elif self.status == Link.ACTIVE:
|
||||
if time.time() >= self.last_inbound + self.keepalive:
|
||||
sleep_time = self.rtt * self.timeout_factor
|
||||
self.status = Link.STALE
|
||||
if self.initiator:
|
||||
self.send_keepalive()
|
||||
else:
|
||||
sleep_time = (self.last_inbound + self.keepalive) - time.time()
|
||||
|
||||
elif self.status == Link.STALE:
|
||||
sleep_time = 0.001
|
||||
self.status = Link.CLOSED
|
||||
self.teardown_reason = Link.TIMEOUT
|
||||
self.link_closed()
|
||||
|
||||
|
||||
if sleep_time == 0:
|
||||
RNS.log("Warning! Link watchdog sleep time of 0!", RNS.LOG_ERROR)
|
||||
if sleep_time == None or sleep_time < 0:
|
||||
RNS.log("Timing error! Closing Reticulum now.", RNS.LOG_CRITICAL)
|
||||
RNS.panic()
|
||||
|
||||
sleep(sleep_time)
|
||||
|
||||
|
||||
def send_keepalive(self):
|
||||
keepalive_packet = RNS.Packet(self, chr(0xFF), context=RNS.Packet.KEEPALIVE)
|
||||
keepalive_packet.send()
|
||||
|
||||
def receive(self, packet):
|
||||
if not self.status == Link.CLOSED:
|
||||
self.watchdog_lock = True
|
||||
if not self.status == Link.CLOSED and not (self.initiator and packet.context == RNS.Packet.KEEPALIVE and packet.data == chr(0xFF)):
|
||||
if packet.receiving_interface != self.attached_interface:
|
||||
RNS.log("Link-associated packet received on unexpected interface! Someone might be trying to manipulate your communication!", RNS.LOG_ERROR)
|
||||
else:
|
||||
self.last_inbound = time.time()
|
||||
self.rx += 1
|
||||
self.rxbytes += len(packet.data)
|
||||
if self.status == Link.STALE:
|
||||
self.status = Link.ACTIVE
|
||||
|
||||
if packet.packet_type == RNS.Packet.DATA:
|
||||
if packet.context == RNS.Packet.NONE:
|
||||
plaintext = self.decrypt(packet.data)
|
||||
@ -259,6 +362,12 @@ class Link:
|
||||
if resource_hash == resource.hash:
|
||||
resource.cancel()
|
||||
|
||||
elif packet.context == RNS.Packet.KEEPALIVE:
|
||||
if not self.initiator and packet.data == chr(0xFF):
|
||||
keepalive_packet = RNS.Packet(self, chr(0xFE), context=RNS.Packet.KEEPALIVE)
|
||||
keepalive_packet.send()
|
||||
|
||||
|
||||
# TODO: find the most efficient way to allow multiple
|
||||
# transfers at the same time, sending resource hash on
|
||||
# each packet is a huge overhead. Probably some kind
|
||||
@ -274,6 +383,8 @@ class Link:
|
||||
if resource_hash == resource.hash:
|
||||
resource.validateProof(packet.data)
|
||||
|
||||
self.watchdog_lock = False
|
||||
|
||||
|
||||
def encrypt(self, plaintext):
|
||||
if self.__encryption_disabled:
|
||||
|
||||
@ -29,6 +29,7 @@ class Packet:
|
||||
RESPONSE = 0x09
|
||||
COMMAND = 0x0A
|
||||
COMMAND_STAT = 0x0B
|
||||
KEEPALIVE = 0xFC
|
||||
LINKCLOSE = 0xFD
|
||||
LRRTT = 0xFE
|
||||
LRPROOF = 0xFF
|
||||
@ -98,6 +99,10 @@ class Packet:
|
||||
# A resource takes care of symmetric
|
||||
# encryption by itself
|
||||
self.ciphertext = self.data
|
||||
elif self.context == Packet.KEEPALIVE:
|
||||
# Keepalive packets contain no actual
|
||||
# data
|
||||
self.ciphertext = self.data
|
||||
else:
|
||||
# In all other cases, we encrypt the packet
|
||||
# with the destination's public key
|
||||
@ -148,6 +153,11 @@ class Packet:
|
||||
if self.destination.type == RNS.Destination.LINK:
|
||||
if self.destination.status == RNS.Link.CLOSED:
|
||||
raise IOError("Attempt to transmit over a closed link")
|
||||
else:
|
||||
self.destination.last_outbound = time.time()
|
||||
self.destination.tx += 1
|
||||
self.destination.txbytes += len(self.data)
|
||||
|
||||
if not self.packed:
|
||||
self.pack()
|
||||
|
||||
|
||||
@ -4,6 +4,7 @@ import math
|
||||
import time
|
||||
import threading
|
||||
import vendor.umsgpack as umsgpack
|
||||
from time import sleep
|
||||
|
||||
|
||||
class Resource:
|
||||
|
||||
@ -97,6 +97,13 @@ class Transport:
|
||||
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):
|
||||
@ -111,7 +118,7 @@ class Transport:
|
||||
|
||||
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:
|
||||
if Transport.packet_filter(packet):
|
||||
Transport.packet_hashlist.append(packet.packet_hash)
|
||||
|
||||
if packet.packet_type == RNS.Packet.ANNOUNCE:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user