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Added automatic path rediscovery on failed link establishments

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This commit is contained in:
Mark Qvist 2022-12-19 01:15:49 +01:00
parent 66d921e669
commit 13fa7d49d9
1 changed files with 30 additions and 10 deletions
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40
RNS/Transport.py
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@ -66,6 +66,7 @@ class Transport:
PATH_REQUEST_TIMEOUT = 15 # Default timuout for client path requests in seconds
PATH_REQUEST_GRACE = 0.35 # Grace time before a path announcement is made, allows directly reachable peers to respond first
PATH_REQUEST_RW = 2 # Path request random window
PATH_REQUEST_MI = 5 # Minimum interval in seconds for automated path requests
LINK_TIMEOUT = RNS.Link.STALE_TIME * 1.25
REVERSE_TIMEOUT = 30*60 # Reverse table entries are removed after 30 minutes
@ -92,6 +93,7 @@ class Transport:
announce_handlers = [] # A table storing externally registered announce handlers
tunnels = {} # A table storing tunnels to other transport instances
announce_rate_table = {} # A table for keeping track of announce rates
path_requests = {} # A table for storing path request timestamps
discovery_path_requests = {} # A table for keeping track of path requests on behalf of other nodes
discovery_pr_tags = [] # A table for keeping track of tagged path requests
@ -285,6 +287,7 @@ class Transport:
@staticmethod
def jobs():
outgoing = []
path_requests = []
Transport.jobs_running = True
try:
@ -384,10 +387,18 @@ class Transport:
if time.time() > link_entry[0] + Transport.LINK_TIMEOUT:
stale_links.append(link_id)
else:
# TODO: Decrease timeout for invalidation and path re-request
if time.time() > link_entry[0] + Transport.LINK_TIMEOUT:
if time.time() > link_entry[8]:
stale_links.append(link_id)
last_path_request = 0
if link_entry[6] in Transport.path_requests:
last_path_request = Transport.path_requests[link_entry[6]]
# TODO: Check that we are local client shared instance
if time.time() - last_path_request > Transport.PATH_REQUEST_MI:
RNS.log("Retrying path resolution for "+RNS.prettyhexrep(link_entry[6])+" since an attempted link was never established", RNS.LOG_DEBUG)
path_requests.append(link_entry[6])
# Cull the path table
stale_paths = []
for destination_hash in Transport.destination_table:
@ -518,6 +529,9 @@ class Transport:
for packet in outgoing:
packet.send()
for destination_hash in path_requests:
Transport.request_path(destination_hash)
@staticmethod
def transmit(interface, raw):
try:
@ -1003,15 +1017,19 @@ class Transport:
outbound_interface = Transport.destination_table[packet.destination_hash][5]
if packet.packet_type == RNS.Packet.LINKREQUEST:
now = time.time()
proof_timeout = now + RNS.Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, remaining_hops)
# Entry format is
link_entry = [ time.time(), # 0: Timestamp,
link_entry = [ now, # 0: Timestamp,
next_hop, # 1: Next-hop transport ID
outbound_interface, # 2: Next-hop interface
remaining_hops, # 3: Remaining hops
packet.receiving_interface, # 4: Received on interface
packet.hops, # 5: Taken hops
packet.destination_hash, # 6: Original destination hash
False] # 7: Validated
False, # 7: Validated
proof_timeout] # 8: Proof timeout timestamp
Transport.link_table[packet.getTruncatedHash()] = link_entry
@ -1211,9 +1229,9 @@ class Transport:
retransmit_timeout = now + (RNS.rand() * Transport.PATHFINDER_RW)
if packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT:
if hasattr(packet.receiving_interface, "mode") and packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT:
expires = now + Transport.AP_PATH_TIME
elif packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
elif hasattr(packet.receiving_interface, "mode") and packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ROAMING:
expires = now + Transport.ROAMING_PATH_TIME
else:
expires = now + Transport.PATHFINDER_E
@ -1386,10 +1404,11 @@ class Transport:
# Handling for linkrequests to local destinations
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)
if packet.transport_id == None or packet.transport_id == Transport.identity.hash:
for destination in Transport.destinations:
if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
packet.destination = destination
destination.receive(packet)
# Handling for local data packets
elif packet.packet_type == RNS.Packet.DATA:
@ -1849,6 +1868,7 @@ class Transport:
on_interface.announce_allowed_at = now + wait_time
packet.send()
Transport.path_requests[destination_hash] = time.time()
@staticmethod
def path_request_handler(data, packet):