test: BIP324: add check for missing garbage terminator detection

Author: theStack

test/functional/p2p_v2_transport.py

@@ -148,6 +148,19 @@ def run_test(self):
             with self.nodes[0].assert_debug_log("V2 transport error: V1 peer with wrong MessageStart"):
                 s.sendall(wrong_network_magic_prefix + b"somepayload")
 
+        # Check detection of missing garbage terminator (hits after fixed amount of data if terminator never matches garbage)
+        MAX_KEY_GARB_AND_GARBTERM_LEN = 64 + 4095 + 16
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+            num_peers = len(self.nodes[0].getpeerinfo())
+            s.connect(("127.0.0.1", p2p_port(0)))
+            self.wait_until(lambda: len(self.nodes[0].getpeerinfo()) == num_peers + 1)
+            s.sendall(b'\x00' * (MAX_KEY_GARB_AND_GARBTERM_LEN - 1))
+            self.wait_until(lambda: self.nodes[0].getpeerinfo()[-1]["bytesrecv"] == MAX_KEY_GARB_AND_GARBTERM_LEN - 1)
+            with self.nodes[0].assert_debug_log("V2 transport error: missing garbage terminator"):
+                s.sendall(b'\x00')  # send out last byte
+                # should disconnect immediately
+                self.wait_until(lambda: len(self.nodes[0].getpeerinfo()) == num_peers)
+
 
 if __name__ == '__main__':
     V2TransportTest().main()