bacnet_stack/ports/pic18f6720/apdu.c

/*####COPYRIGHTBEGIN####
 -------------------------------------------
 Copyright (C) 2007 Steve Karg

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to:
 The Free Software Foundation, Inc.
 59 Temple Place - Suite 330
 Boston, MA  02111-1307, USA.

 As a special exception, if other files instantiate templates or
 use macros or inline functions from this file, or you compile
 this file and link it with other works to produce a work based
 on this file, this file does not by itself cause the resulting
 work to be covered by the GNU General Public License. However
 the source code for this file must still be made available in
 accordance with section (3) of the GNU General Public License.

 This exception does not invalidate any other reasons why a work
 based on this file might be covered by the GNU General Public
 License.
 -------------------------------------------
####COPYRIGHTEND####*/
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include "bacnet/bits.h"
#include "bacnet/bacdef.h"
#include "bacnet/bacdcode.h"
#include "bacnet/bacenum.h"
#include "bacnet/dcc.h"
#include "bacnet/basic/services.h"
/* me */
#include "bacnet/apdu.h"

uint16_t apdu_timeout(
    void)
{
    return 3000;
}

uint8_t apdu_retries(
    void)
{
    return 3;
}

bool apdu_service_supported(
    BACNET_SERVICES_SUPPORTED service_supported)
{
    bool status = false;

    switch (service_supported) {
        case SERVICE_SUPPORTED_READ_PROPERTY:
        case SERVICE_SUPPORTED_WHO_IS:
        case SERVICE_CONFIRMED_REINITIALIZE_DEVICE:
        case SERVICE_SUPPORTED_WRITE_PROPERTY:
        case SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL:
            status = true;
            break;
        default:
            break;
    }

    return status;
}

uint16_t apdu_decode_confirmed_service_request(
    uint8_t * apdu,     /* APDU data */
    uint16_t apdu_len,
    BACNET_CONFIRMED_SERVICE_DATA * service_data,
    uint8_t * service_choice,
    uint8_t ** service_request,
    uint16_t * service_request_len)
{
    uint16_t len = 0;   /* counts where we are in PDU */

    service_data->segmented_message = (apdu[0] & BIT3) ? true : false;
    service_data->more_follows = (apdu[0] & BIT2) ? true : false;
    service_data->segmented_response_accepted =
        (apdu[0] & BIT1) ? true : false;
    service_data->max_segs = decode_max_segs(apdu[1]);
    service_data->max_resp = decode_max_apdu(apdu[1]);
    service_data->invoke_id = apdu[2];
    len = 3;
    if (service_data->segmented_message) {
        service_data->sequence_number = apdu[len++];
        service_data->proposed_window_number = apdu[len++];
    }
    *service_choice = apdu[len++];
    *service_request = &apdu[len];
    *service_request_len = apdu_len - len;

    return len;
}

/* When network communications are completely disabled,
   only DeviceCommunicationControl and ReinitializeDevice APDUs
   shall be processed and no messages shall be initiated.
   When the initiation of communications is disabled,
   all APDUs shall be processed and responses returned as
   required... */
static bool apdu_confirmed_dcc_disabled(
    uint8_t service_choice)
{
    bool status = false;

    if (dcc_communication_disabled()) {
        switch (service_choice) {
            case SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL:
            case SERVICE_CONFIRMED_REINITIALIZE_DEVICE:
                break;
            default:
                status = true;
                break;
        }
    }

    return status;
}

/* When network communications are completely disabled,
   only DeviceCommunicationControl and ReinitializeDevice APDUs
   shall be processed and no messages shall be initiated. */
/* If the request is valid and the 'Enable/Disable' parameter is
   DISABLE_INITIATION, the responding BACnet-user shall
   discontinue the initiation of messages except for I-Am
   requests issued in accordance with the Who-Is service procedure.*/
static bool apdu_unconfirmed_dcc_disabled(
    uint8_t service_choice)
{
    bool status = false;

    if (dcc_communication_disabled()) {
        /* there are no Unconfirmed messages that
           can be processed in this state */
        status = true;
    } else if (dcc_communication_initiation_disabled()) {
        /* WhoIs will be processed and I-Am initiated as response. */
        switch (service_choice) {
            case SERVICE_UNCONFIRMED_WHO_IS:
                break;
            default:
                status = true;
                break;
        }
    }

    return status;
}

void apdu_handler(
    BACNET_ADDRESS * src,
    uint8_t * apdu,     /* APDU data */
    uint16_t apdu_len)
{
    BACNET_CONFIRMED_SERVICE_DATA service_data = { 0 };
    uint8_t service_choice = 0;
    uint8_t *service_request = NULL;
    uint16_t service_request_len = 0;
    uint16_t len = 0;   /* counts where we are in PDU */

    if (apdu) {
        /* PDU Type */
        switch (apdu[0] & 0xF0) {
            case PDU_TYPE_CONFIRMED_SERVICE_REQUEST:
                len = apdu_decode_confirmed_service_request(&apdu[0],   /* APDU data */
                    apdu_len, &service_data, &service_choice, &service_request,
                    &service_request_len);
                if (apdu_confirmed_dcc_disabled(service_choice)) {
                    /* When network communications are completely disabled,
                       only DeviceCommunicationControl and ReinitializeDevice APDUs
                       shall be processed and no messages shall be initiated. */
                    break;
                }
                if (service_choice == SERVICE_CONFIRMED_READ_PROPERTY) {
                    handler_read_property(service_request, service_request_len,
                        src, &service_data);
                } else if (service_choice == SERVICE_CONFIRMED_WRITE_PROPERTY) {
                    handler_write_property(service_request,
                        service_request_len, src, &service_data);
                } else if (service_choice ==
                    SERVICE_CONFIRMED_REINITIALIZE_DEVICE) {
                    handler_reinitialize_device(service_request,
                        service_request_len, src, &service_data);
                } else if (service_choice ==
                    SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL) {
                    handler_device_communication_control(service_request,
                        service_request_len, src, &service_data);
                } else {
                    handler_unrecognized_service(service_request,
                        service_request_len, src, &service_data);
                }
                break;
            case PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST:
                service_choice = apdu[1];
                service_request = &apdu[2];
                service_request_len = apdu_len - 2;
                if (apdu_unconfirmed_dcc_disabled(service_choice)) {
                    /* When network communications are disabled,
                       only DeviceCommunicationControl and ReinitializeDevice APDUs
                       shall be processed and no messages shall be initiated.
                       If communications have been initiation disabled, then
                       WhoIs may be processed. */
                    break;
                }
                if (service_choice == SERVICE_UNCONFIRMED_WHO_IS) {
                    handler_who_is(service_request, service_request_len, src);
                }
                break;
            case PDU_TYPE_SIMPLE_ACK:
            case PDU_TYPE_COMPLEX_ACK:
            case PDU_TYPE_SEGMENT_ACK:
            case PDU_TYPE_ERROR:
            case PDU_TYPE_REJECT:
            case PDU_TYPE_ABORT:
            default:
                break;
        }
    }
    return;
}