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Fixed missing check for zero-length packets on IFAC-enabled interfaces. Fixes #65.

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This commit is contained in:
Mark Qvist 2022-06-11 18:52:26 +02:00
parent 214ee9d771
commit 2685e043ea
2 changed files with 27 additions and 38 deletions
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63
RNS/Transport.py
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@ -26,7 +26,6 @@ import time
import math
import struct
import threading
import traceback
from time import sleep
from .vendor import umsgpack as umsgpack
@ -285,9 +284,6 @@ class Transport:
outgoing = []
Transport.jobs_running = True
# TODO: Remove at some point
# start_time = time.time()
try:
if not Transport.jobs_locked:
# Process receipts list for timed-out packets
@ -508,17 +504,9 @@ class Transport:
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)
traceback.print_exc()
Transport.jobs_running = False
# TODO: Remove at some point
# end_time = time.time()
# if RNS.loglevel >= RNS.LOG_EXTREME:
# duration = round((end_time - start_time) * 1000, 2)
# if duration > 1:
# RNS.log("Transport jobs took "+str(duration)+"ms", RNS.LOG_EXTREME)
for packet in outgoing:
packet.send()
@ -822,42 +810,43 @@ class Transport:
def inbound(raw, interface=None):
# If interface access codes are enabled,
# we must authenticate each packet.
if interface != None and hasattr(interface, "ifac_identity") and interface.ifac_identity != None:
# Check that IFAC flag is set
if raw[0] & 0x80 == 0x80:
if len(raw) > 2+interface.ifac_size:
# Extract IFAC
ifac = raw[2:2+interface.ifac_size]
if len(raw) > 1:
if interface != None and hasattr(interface, "ifac_identity") and interface.ifac_identity != None:
# Check that IFAC flag is set
if raw[0] & 0x80 == 0x80:
if len(raw) > 2+interface.ifac_size:
# Extract IFAC
ifac = raw[2:2+interface.ifac_size]
# Unset IFAC flag
new_header = bytes([raw[0] & 0x7f, raw[1]])
# Unset IFAC flag
new_header = bytes([raw[0] & 0x7f, raw[1]])
# Re-assemble packet
new_raw = new_header+raw[2+interface.ifac_size:]
# Re-assemble packet
new_raw = new_header+raw[2+interface.ifac_size:]
# Calculate expected IFAC
expected_ifac = interface.ifac_identity.sign(new_raw)[-interface.ifac_size:]
# Calculate expected IFAC
expected_ifac = interface.ifac_identity.sign(new_raw)[-interface.ifac_size:]
# Check it
if ifac == expected_ifac:
raw = new_raw
else:
return
# Check it
if ifac == expected_ifac:
raw = new_raw
else:
return
else:
# If the IFAC flag is not set, but should be,
# drop the packet.
return
else:
# If the IFAC flag is not set, but should be,
# drop the packet.
return
else:
# If the interface does not have IFAC enabled,
# check the received packet IFAC flag.
if raw[0] & 0x80 == 0x80:
# If the flag is set, drop the packet
return
# If the interface does not have IFAC enabled,
# check the received packet IFAC flag.
if raw[0] & 0x80 == 0x80:
# If the flag is set, drop the packet
return
while (Transport.jobs_running):
sleep(0.0005)