From 1a2da0d7c75bd6d72facf6dabca79ef73645168d Mon Sep 17 00:00:00 2001
From: Mark Qvist <mark@unsigned.io>
Date: Thu, 28 Apr 2022 10:38:34 +0200
Subject: [PATCH] Drop IFAC packets on non-IFAC interfaces

---
 RNS/Transport.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/RNS/Transport.py b/RNS/Transport.py
index cc773e1..3cd2095 100755
--- a/RNS/Transport.py
+++ b/RNS/Transport.py
@@ -758,6 +758,15 @@ class Transport:
                 RNS.log(str(interface)+" with IFAC enabled received packet without access code, dropping.", RNS.LOG_EXTREME)
                 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
+                # TODO: Remove log statements
+                RNS.log(str(interface)+" with IFAC disabled received packet with access code, dropping.", RNS.LOG_EXTREME)
+                return
+
         while (Transport.jobs_running):
             sleep(0.01)