bacnet-stack/demo/handler/h_whohas.c

/**************************************************************************
*
* Copyright (C) 2006 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 "whohas.h"
#include "device.h"
#include "client.h"
#include "handlers.h"

/** @file h_whohas.c  Handles Who-Has requests. */

/** Local function which responds with either the requested object name
 *  or object ID, if the Device has a match.
 *  @param data [in] The decoded who-has payload from the request.
 */
static void match_name_or_object(
    BACNET_WHO_HAS_DATA * data)
{
    int object_type = 0;
    uint32_t object_instance = 0;
    bool found = false;
    BACNET_CHARACTER_STRING object_name;

    /* do we have such an object?  If so, send an I-Have.
       note: we should have only 1 of such an object */
    if (data->is_object_name) {
        /* valid name in my device? */
        found =
            Device_Valid_Object_Name(&data->object.name, &object_type,
            &object_instance);
        if (found) {
            Send_I_Have(Device_Object_Instance_Number(),
                (BACNET_OBJECT_TYPE) object_type, object_instance,
                &data->object.name);
        }
    } else {
        /* valid object_name copy in my device? */
        found =
            Device_Object_Name_Copy((BACNET_OBJECT_TYPE) data->
            object.identifier.type, data->object.identifier.instance,
            &object_name);
        if (found) {
            Send_I_Have(Device_Object_Instance_Number(),
                (BACNET_OBJECT_TYPE) data->object.identifier.type,
                data->object.identifier.instance, &object_name);
        }
    }
}


/** Handler for Who-Has requests, with broadcast I-Have response.
 * Will respond if the device Object ID matches, and we have
 * the Object or Object Name requested.
 *
 * @ingroup DMDOB
 * @param service_request [in] The received message to be handled.
 * @param service_len [in] Length of the service_request message.
 * @param src [in] The BACNET_ADDRESS of the message's source.
 */
void handler_who_has(
    uint8_t * service_request,
    uint16_t service_len,
    BACNET_ADDRESS * src)
{
    int len = 0;
    BACNET_WHO_HAS_DATA data;
    bool directed_to_me = false;

    (void) src;
    len = whohas_decode_service_request(service_request, service_len, &data);
    if (len > 0) {
        if ((data.low_limit == -1) || (data.high_limit == -1))
            directed_to_me = true;
        else if ((Device_Object_Instance_Number() >= (uint32_t) data.low_limit)
            && (Device_Object_Instance_Number() <= (uint32_t) data.high_limit))
            directed_to_me = true;
        if (directed_to_me) {
            match_name_or_object(&data);
        }
    }
}


#ifdef BAC_ROUTING      /* was for BAC_ROUTING - delete in 2/2012 if still unused */
                                                /* EKH: I restored this to BAC_ROUTING (from DEPRECATED) because I found that the server demo with the built-in 
                                                   virtual Router did not insert the SADRs of the virtual devices on the virtual network without it */

/** Handler for Who-Has requests in the virtual routing setup,
 * with broadcast I-Have response.
 * Will respond if the device Object ID matches, and we have
 * the Object or Object Name requested.
 *
 * @ingroup DMDOB
 * @param service_request [in] The received message to be handled.
 * @param service_len [in] Length of the service_request message.
 * @param src [in] The BACNET_ADDRESS of the message's source (ignored).
 */
void handler_who_has_for_routing(
    uint8_t * service_request,
    uint16_t service_len,
    BACNET_ADDRESS * src)
{
    int len = 0;
    BACNET_WHO_HAS_DATA data;
    int32_t dev_instance;
    int cursor = 0;     /* Starting hint */
    int my_list[2] = { 0, -1 }; /* Not really used, so dummy values */
    BACNET_ADDRESS bcast_net;

    (void) src;
    len = whohas_decode_service_request(service_request, service_len, &data);
    if (len > 0) {
        /* Go through all devices, starting with the root gateway Device */
        memset(&bcast_net, 0, sizeof(BACNET_ADDRESS));
        bcast_net.net = BACNET_BROADCAST_NETWORK;       /* That's all we have to set */
        while (Routed_Device_GetNext(&bcast_net, my_list, &cursor)) {
            dev_instance = Device_Object_Instance_Number();
            if ((data.low_limit == -1) || (data.high_limit == -1) ||
                ((dev_instance >= data.low_limit) &&
                    (dev_instance <= data.high_limit)))
                match_name_or_object(&data);
        }
    }
}
#endif /* BAC_ROUTING */