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Handle link transport edge case

This commit is contained in:
Mark Qvist 2024-09-21 19:04:28 +02:00
parent 3e4172b697
commit ba856ea1c4
2 changed files with 15 additions and 4 deletions
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4
RNS/Link.py
View File

@ -125,7 +125,7 @@ class Link:
link.last_inbound = time.time() link.last_inbound = time.time()
link.start_watchdog() link.start_watchdog()
RNS.log("Incoming link request "+str(link)+" accepted", RNS.LOG_DEBUG) RNS.log("Incoming link request "+str(link)+" accepted on "+str(link.attached_interface), RNS.LOG_DEBUG)
return link return link
except Exception as e: except Exception as e:
@ -762,7 +762,7 @@ class Link:
self.watchdog_lock = True self.watchdog_lock = True
if not self.status == Link.CLOSED and not (self.initiator and packet.context == RNS.Packet.KEEPALIVE and packet.data == bytes([0xFF])): if not self.status == Link.CLOSED and not (self.initiator and packet.context == RNS.Packet.KEEPALIVE and packet.data == bytes([0xFF])):
if packet.receiving_interface != self.attached_interface: 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) RNS.log(f"Link-associated packet received on unexpected interface {packet.receiving_interface} instead of {self.attached_interface}! Someone might be trying to manipulate your communication!", RNS.LOG_ERROR)
else: else:
self.last_inbound = time.time() self.last_inbound = time.time()
if packet.context != RNS.Packet.KEEPALIVE: if packet.context != RNS.Packet.KEEPALIVE:

15
RNS/Transport.py
View File

@ -1736,8 +1736,19 @@ class Transport:
if packet.destination_type == RNS.Destination.LINK: if packet.destination_type == RNS.Destination.LINK:
for link in Transport.active_links: for link in Transport.active_links:
if link.link_id == packet.destination_hash: if link.link_id == packet.destination_hash:
packet.link = link if link.attached_interface == packet.receiving_interface:
link.receive(packet) packet.link = link
link.receive(packet)
else:
# In the strange and rare case that an interface
# is partly malfunctioning, and a link-associated
# packet is being received on an interface that
# has failed sending, and transport has failed over
# to another path, we remove this packet hash from
# the filter hashlist so the link can receive the
# packet when it finally arrives over another path.
while packet.packet_hash in Transport.packet_hashlist:
Transport.packet_hashlist.remove(packet.packet_hash)
else: else:
for destination in Transport.destinations: for destination in Transport.destinations:
if destination.hash == packet.destination_hash and destination.type == packet.destination_type: if destination.hash == packet.destination_hash and destination.type == packet.destination_type: