h_dcc.c : Return correct error when no service request (#877)

src/bacnet/basic/service/h_dcc.c

@@ -113,7 +113,17 @@ void handler_device_communication_control(
             "DeviceCommunicationControl: "
             "Sending Abort - segmented message.\n");
 #endif
-        goto DCC_ABORT;
+        goto DCC_FAILURE;
+    }
+
+    if (!service_request || service_len == 0) {
+        len = reject_encode_apdu(
+            &Handler_Transmit_Buffer[pdu_len], service_data->invoke_id,
+            REJECT_REASON_MISSING_REQUIRED_PARAMETER);
+#if PRINT_ENABLED
+        fprintf(stderr, "DCC: Sending Reject!\n");
+#endif
+        goto DCC_FAILURE;
     }
     /* decode the service request only */
     len = dcc_decode_service_request(
@@ -146,7 +156,7 @@ void handler_device_communication_control(
             fprintf(stderr, "DCC: Sending Reject!\n");
 #endif
         }
-        goto DCC_ABORT;
+        goto DCC_FAILURE;
     }
 #if (BACNET_PROTOCOL_REVISION >= 20)
     if (state == COMMUNICATION_DISABLE) {
@@ -163,7 +173,7 @@ void handler_device_communication_control(
             "DeviceCommunicationControl: "
             "Sending Error - DISABLE has been deprecated.\n");
 #endif
-        goto DCC_ABORT;
+        goto DCC_FAILURE;
     }
 #endif
     if (state >= MAX_BACNET_COMMUNICATION_ENABLE_DISABLE) {
@@ -183,7 +193,7 @@ void handler_device_communication_control(
             SERVICE_SUPPORTED_DEVICE_COMMUNICATION_CONTROL, (int)state,
             &Handler_Transmit_Buffer[pdu_len], service_data->invoke_id);
         if (len > 0) {
-            goto DCC_ABORT;
+            goto DCC_FAILURE;
         }
 #endif
         if ((My_Password[0] == '\0') ||
@@ -211,7 +221,7 @@ void handler_device_communication_control(
 #endif
         }
     }
-DCC_ABORT:
+DCC_FAILURE:
     pdu_len += len;
     len = datalink_send_pdu(
         src, &npdu_data, &Handler_Transmit_Buffer[0], pdu_len);

src/bacnet/dcc.c

@@ -250,7 +250,7 @@ int dcc_encode_apdu(
  * @param apdu  Pointer to the received request.
  * @param apdu_len_max  Valid count of bytes in the buffer.
  * @param timeDuration  Pointer to the duration given in minutes [optional]
- * @param enable_disable  Pointer to the variable takingthe communication
+ * @param enable_disable  Pointer to the variable taking the communication
  * enable/disable.
  * @param password  Pointer to the password [optional]
  *