bacnet-stack/demo/handler/h_getevent.c

/**************************************************************************
*
* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "config.h"
#include "txbuf.h"
#include "bacdef.h"
#include "bacdcode.h"
#include "bacerror.h"
#include "apdu.h"
#include "npdu.h"
#include "abort.h"
#include "event.h"
#include "getevent.h"
#include "handlers.h"

/** @file h_getevent.c  Handles Get Event Information request. */

static get_event_info_function Get_Event_Info[MAX_BACNET_OBJECT_TYPE];

void handler_get_event_information_set(
    BACNET_OBJECT_TYPE object_type,
    get_event_info_function pFunction)
{
    if (object_type < MAX_BACNET_OBJECT_TYPE) {
        Get_Event_Info[object_type] = pFunction;
    }
}

void handler_get_event_information(
    uint8_t * service_request,
    uint16_t service_len,
    BACNET_ADDRESS * src,
    BACNET_CONFIRMED_SERVICE_DATA * service_data)
{
    int len = 0;
    int pdu_len = 0;
    int apdu_len = 0;
    BACNET_NPDU_DATA npdu_data;
    bool error = false;
    bool more_events = false;
    int bytes_sent = 0;
    BACNET_ERROR_CLASS error_class = ERROR_CLASS_OBJECT;
    BACNET_ERROR_CODE error_code = ERROR_CODE_UNKNOWN_OBJECT;
    BACNET_ADDRESS my_address;
    BACNET_OBJECT_ID object_id;
    unsigned i = 0, j = 0;      /* counter */
    BACNET_GET_EVENT_INFORMATION_DATA getevent_data;
    int valid_event = 0;

    /* initialize type of 'Last Received Object Identifier' using max value */
    object_id.type = MAX_BACNET_OBJECT_TYPE;

    /* encode the NPDU portion of the packet */
    datalink_get_my_address(&my_address);
    npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL);
    pdu_len =
        npdu_encode_pdu(&Handler_Transmit_Buffer[0], src, &my_address,
        &npdu_data);
    if (service_data->segmented_message) {
        /* we don't support segmentation - send an abort */
        len =
            abort_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
            service_data->invoke_id, ABORT_REASON_SEGMENTATION_NOT_SUPPORTED,
            true);
#if PRINT_ENABLED
        fprintf(stderr,
            "GetEventInformation: " "Segmented message. Sending Abort!\n");
#endif
        goto GET_EVENT_ABORT;
    }

    len =
        getevent_decode_service_request(service_request, service_len,
        &object_id);
    if (len < 0) {
        /* bad decoding - send an abort */
        len =
            abort_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
            service_data->invoke_id, ABORT_REASON_OTHER, true);
#if PRINT_ENABLED
        fprintf(stderr,
            "GetEventInformation: Bad Encoding.  Sending Abort!\n");
#endif
        goto GET_EVENT_ABORT;
    }
    len =
        getevent_ack_encode_apdu_init(&Handler_Transmit_Buffer[pdu_len],
        sizeof(Handler_Transmit_Buffer) - pdu_len, service_data->invoke_id);
    if (len <= 0) {
        error = true;
        goto GET_EVENT_ERROR;
    }
    pdu_len += len;
    apdu_len = len;
    for (i = 0; i < MAX_BACNET_OBJECT_TYPE; i++) {
        if (Get_Event_Info[i]) {
            for (j = 0; j < 0xffff; j++) {
                valid_event = Get_Event_Info[i] (j, &getevent_data);
                if (valid_event > 0) {
                    /* encode GetEvent_data only when type of object_id has max value */
                    if (object_id.type != MAX_BACNET_OBJECT_TYPE) {
                        if ((object_id.type ==
                                getevent_data.objectIdentifier.type) &&
                            (object_id.instance ==
                                getevent_data.objectIdentifier.instance)) {
                            /* found 'Last Received Object Identifier'
                               so should set type of object_id to max value */
                            object_id.type = MAX_BACNET_OBJECT_TYPE;
                        }
                        continue;
                    }

                    getevent_data.next = NULL;
                    len =
                        getevent_ack_encode_apdu_data(&Handler_Transmit_Buffer
                        [pdu_len], sizeof(Handler_Transmit_Buffer) - pdu_len,
                        &getevent_data);
                    if (len <= 0) {
                        error = true;
                        goto GET_EVENT_ERROR;
                    }
                    apdu_len += len;
                    if (apdu_len >= service_data->max_resp - 2) {
                        /* Device must be able to fit minimum one event information.
                           Length of one event informations needs more than 50 octets. */
                        if (service_data->max_resp < 128) {
                            len = BACNET_STATUS_ABORT;
                            error = true;
                            goto GET_EVENT_ERROR;
                        } else
                            more_events = true;
                        break;
                    } else
                        pdu_len += len;
                } else if (valid_event < 0) {
                    break;
                }
            }
        }
    }
    len =
        getevent_ack_encode_apdu_end(&Handler_Transmit_Buffer[pdu_len],
        sizeof(Handler_Transmit_Buffer) - pdu_len, more_events);
    if (len <= 0) {
        error = true;
        goto GET_EVENT_ERROR;
    }
#if PRINT_ENABLED
    fprintf(stderr, "GetEventInformation: Sending Ack!\n");
#endif
  GET_EVENT_ERROR:
    if (error) {
        pdu_len =
            npdu_encode_pdu(&Handler_Transmit_Buffer[0], src, &my_address,
            &npdu_data);

        if (len == -2) {
            /* BACnet APDU too small to fit data, so proper response is Abort */
            len =
                abort_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
                service_data->invoke_id,
                ABORT_REASON_SEGMENTATION_NOT_SUPPORTED, true);
#if PRINT_ENABLED
            fprintf(stderr,
                "GetEventInformation: " "Reply too big to fit into APDU!\n");
#endif
        } else {
            len =
                bacerror_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
                service_data->invoke_id, SERVICE_CONFIRMED_READ_PROPERTY,
                error_class, error_code);
#if PRINT_ENABLED
            fprintf(stderr, "GetEventInformation: Sending Error!\n");
#endif
        }
    }
  GET_EVENT_ABORT:
    pdu_len += len;
    bytes_sent =
        datalink_send_pdu(src, &npdu_data, &Handler_Transmit_Buffer[0],
        pdu_len);
#if PRINT_ENABLED
    if (bytes_sent <= 0)
        fprintf(stderr, "Failed to send PDU (%s)!\n", strerror(errno));
#endif

    return;
}