bakmaria
213 lines
8.0 KiB
C
213 lines
8.0 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*********************************************************************/
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "bacnet/config.h"
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#include "bacnet/bacdef.h"
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#include "bacnet/bacdcode.h"
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#include "bacnet/bacerror.h"
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#include "bacnet/apdu.h"
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#include "bacnet/npdu.h"
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#include "bacnet/abort.h"
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#include "bacnet/readrange.h"
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/* basic objects, services, TSM, and datalink */
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#include "bacnet/basic/object/device.h"
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#include "bacnet/basic/tsm/tsm.h"
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#include "bacnet/basic/services.h"
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#include "bacnet/datalink/datalink.h"
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/** @file h_rr.c Handles Read Range requests. */
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static uint8_t Temp_Buf[MAX_APDU] = { 0 };
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/**
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* Encodes the property APDU and returns the length,
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* or sets the error, and returns -1.
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*
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* @param apdu Pointer to the APDU buffer.
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* @param pRequest Pointer to the request to encode.
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*
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* @return Bytes encoded or -1 on an error. The error code
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* may also be a negative return value from the called
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* handler of 'PropInfo.Handler' type from within
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* this function. The error code might be -2, if an
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* abort message has been encoded, because the APDU
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* was too small to fit the data.
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*/
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static int Encode_RR_payload(uint8_t *apdu, BACNET_READ_RANGE_DATA *pRequest)
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{
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int apdu_len = -1;
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rr_info_function info_fn_ptr = NULL;
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RR_PROP_INFO PropInfo;
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/* initialize the default return values */
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pRequest->error_class = ERROR_CLASS_SERVICES;
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pRequest->error_code = ERROR_CODE_OTHER;
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/* handle each object type */
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info_fn_ptr = Device_Objects_RR_Info(pRequest->object_type);
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if ((info_fn_ptr != NULL) && (info_fn_ptr(pRequest, &PropInfo) != false)) {
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/* We try and do some of the more generic error checking here to cut
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* down on duplication of effort */
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if (((PropInfo.RequestTypes & RR_ARRAY_OF_LISTS) == 0) &&
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(pRequest->array_index != 0) &&
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(pRequest->array_index != BACNET_ARRAY_ALL)) {
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/* Array access attempted on a non array property */
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pRequest->error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
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} else if ((pRequest->RequestType != RR_READ_ALL) &&
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((PropInfo.RequestTypes & pRequest->RequestType) == 0)) {
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/* By Time or By Sequence not supported - By Position is always
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* required */
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pRequest->error_code =
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ERROR_CODE_OTHER; /* I couldn't see anything more appropriate
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so... */
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} else if ((pRequest->Count == 0) &&
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(pRequest->RequestType != RR_READ_ALL)) { /* Count cannot be zero */
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pRequest->error_code =
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ERROR_CODE_OTHER; /* I couldn't see anything more appropriate
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so... */
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} else if (PropInfo.Handler != NULL) {
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apdu_len = PropInfo.Handler(apdu, pRequest);
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}
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} else {
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/* Either we don't support RR for this property yet or it is not a list
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* or array of lists */
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pRequest->error_code = ERROR_CODE_PROPERTY_IS_NOT_A_LIST;
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}
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return apdu_len;
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}
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/**
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* Handle the received ReadRange request and encode a response.
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*
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* @param service_request Pointer to the service request.
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* @param service_len Bytes valid in the service request.
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* @param src Pointer to the BACnet address.
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* @param service_data Pointer to the service data,
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* taken from the request.
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*/
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void handler_read_range(uint8_t *service_request,
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uint16_t service_len,
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BACNET_ADDRESS *src,
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BACNET_CONFIRMED_SERVICE_DATA *service_data)
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{
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BACNET_READ_RANGE_DATA data;
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int len = 0;
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int pdu_len = 0;
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BACNET_NPDU_DATA npdu_data;
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bool error = false;
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#if PRINT_ENABLED
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int bytes_sent = 0;
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#endif
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BACNET_ADDRESS my_address;
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data.error_class = ERROR_CLASS_OBJECT;
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data.error_code = ERROR_CODE_UNKNOWN_OBJECT;
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/* encode the NPDU portion of the packet */
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datalink_get_my_address(&my_address);
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npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL);
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pdu_len = npdu_encode_pdu(
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&Handler_Transmit_Buffer[0], src, &my_address, &npdu_data);
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if (service_data->segmented_message) {
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/* we don't support segmentation - send an abort */
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len = abort_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
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service_data->invoke_id, ABORT_REASON_SEGMENTATION_NOT_SUPPORTED,
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true);
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#if PRINT_ENABLED
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fprintf(stderr, "RR: Segmented message. Sending Abort!\n");
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#endif
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} else {
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memset(&data, 0, sizeof(data)); /* start with blank canvas */
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len = rr_decode_service_request(service_request, service_len, &data);
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#if PRINT_ENABLED
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if (len <= 0)
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fprintf(stderr, "RR: Unable to decode Request!\n");
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#endif
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if (len < 0) {
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/* bad decoding - send an abort */
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len = abort_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
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service_data->invoke_id, ABORT_REASON_OTHER, true);
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#if PRINT_ENABLED
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fprintf(stderr, "RR: Bad Encoding. Sending Abort!\n");
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#endif
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} else {
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/* assume that there is an error */
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error = true;
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len = Encode_RR_payload(&Temp_Buf[0], &data);
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if (len >= 0) {
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/* encode the APDU portion of the packet */
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data.application_data = &Temp_Buf[0];
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data.application_data_len = len;
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/* FIXME: probably need a length limitation sent with encode */
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len = rr_ack_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
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service_data->invoke_id, &data);
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#if PRINT_ENABLED
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fprintf(stderr, "RR: Sending Ack!\n");
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#endif
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error = false;
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}
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if (error) {
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if (len == -2) {
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/* BACnet APDU too small to fit data, so proper response is
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* Abort */
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len = abort_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
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service_data->invoke_id,
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ABORT_REASON_SEGMENTATION_NOT_SUPPORTED, true);
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#if PRINT_ENABLED
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fprintf(stderr, "RR: Reply too big to fit into APDU!\n");
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#endif
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} else {
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len = bacerror_encode_apdu(
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&Handler_Transmit_Buffer[pdu_len],
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service_data->invoke_id, SERVICE_CONFIRMED_READ_RANGE,
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data.error_class, data.error_code);
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#if PRINT_ENABLED
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fprintf(stderr, "RR: Sending Error!\n");
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#endif
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}
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}
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}
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}
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pdu_len += len;
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#if PRINT_ENABLED
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bytes_sent =
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#endif
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datalink_send_pdu(
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src, &npdu_data, &Handler_Transmit_Buffer[0], pdu_len);
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#if PRINT_ENABLED
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if (bytes_sent <= 0)
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fprintf(stderr, "Failed to send PDU (%s)!\n", strerror(errno));
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#endif
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return;
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}
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