nes-proj/os/services/lwm2m/lwm2m-server.c

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/*
* Copyright (c) 2015-2018, Yanzi Networks AB.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup lwm2m
* @{
*
*/
/**
* \file
* Implementation of the Contiki OMA LWM2M server
* \author
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include <stdint.h>
#include "lib/list.h"
#include "lwm2m-object.h"
#include "lwm2m-engine.h"
#include "lwm2m-server.h"
#include "lwm2m-rd-client.h"
/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "lwm2m-srv"
#define LOG_LEVEL LOG_LEVEL_LWM2M
#define MAX_COUNT LWM2M_SERVER_MAX_COUNT
static lwm2m_status_t lwm2m_callback(lwm2m_object_instance_t *object,
lwm2m_context_t *ctx);
static lwm2m_object_instance_t *create_instance(uint16_t instance_id,
lwm2m_status_t *status);
static int delete_instance(uint16_t instance_id, lwm2m_status_t *status);
static lwm2m_object_instance_t *get_first(lwm2m_status_t *status);
static lwm2m_object_instance_t *get_next(lwm2m_object_instance_t *instance,
lwm2m_status_t *status);
static lwm2m_object_instance_t *get_by_id(uint16_t instance_id,
lwm2m_status_t *status);
static const lwm2m_resource_id_t resources[] = {
RO(LWM2M_SERVER_SHORT_SERVER_ID),
RW(LWM2M_SERVER_LIFETIME_ID),
EX(LWM2M_SERVER_REG_UPDATE_TRIGGER_ID)
};
static const lwm2m_object_impl_t impl = {
.object_id = LWM2M_OBJECT_SERVER_ID,
.get_first = get_first,
.get_next = get_next,
.get_by_id = get_by_id,
.create_instance = create_instance,
.delete_instance = delete_instance,
};
static lwm2m_object_t server_object = {
.impl = &impl,
};
LIST(server_list);
static lwm2m_server_t server_instances[MAX_COUNT];
/*---------------------------------------------------------------------------*/
static lwm2m_object_instance_t *
create_instance(uint16_t instance_id, lwm2m_status_t *status)
{
lwm2m_object_instance_t *instance;
int i;
instance = get_by_id(instance_id, NULL);
if(instance != NULL) {
/* An instance with this id is already registered */
if(status) {
*status = LWM2M_STATUS_OPERATION_NOT_ALLOWED;
}
return NULL;
}
for(i = 0; i < MAX_COUNT; i++) {
if(server_instances[i].instance.instance_id == LWM2M_OBJECT_INSTANCE_NONE) {
server_instances[i].instance.callback = lwm2m_callback;
server_instances[i].instance.object_id = LWM2M_OBJECT_SERVER_ID;
server_instances[i].instance.instance_id = instance_id;
server_instances[i].instance.resource_ids = resources;
server_instances[i].instance.resource_count =
sizeof(resources) / sizeof(lwm2m_resource_id_t);
server_instances[i].server_id = 0;
server_instances[i].lifetime = 0;
list_add(server_list, &server_instances[i].instance);
if(status) {
*status = LWM2M_STATUS_OK;
}
return &server_instances[i].instance;
}
}
if(status) {
*status = LWM2M_STATUS_SERVICE_UNAVAILABLE;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
static int
delete_instance(uint16_t instance_id, lwm2m_status_t *status)
{
lwm2m_object_instance_t *instance;
if(status) {
*status = LWM2M_STATUS_OK;
}
if(instance_id == LWM2M_OBJECT_INSTANCE_NONE) {
/* Remove all instances */
while((instance = list_pop(server_list)) != NULL) {
instance->instance_id = LWM2M_OBJECT_INSTANCE_NONE;
}
return 1;
}
instance = get_by_id(instance_id, NULL);
if(instance != NULL) {
instance->instance_id = LWM2M_OBJECT_INSTANCE_NONE;
list_remove(server_list, instance);
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static lwm2m_object_instance_t *
get_first(lwm2m_status_t *status)
{
if(status) {
*status = LWM2M_STATUS_OK;
}
return list_head(server_list);
}
/*---------------------------------------------------------------------------*/
static lwm2m_object_instance_t *
get_next(lwm2m_object_instance_t *instance, lwm2m_status_t *status)
{
if(status) {
*status = LWM2M_STATUS_OK;
}
return instance == NULL ? NULL : instance->next;
}
/*---------------------------------------------------------------------------*/
static lwm2m_object_instance_t *
get_by_id(uint16_t instance_id, lwm2m_status_t *status)
{
lwm2m_object_instance_t *instance;
if(status) {
*status = LWM2M_STATUS_OK;
}
for(instance = list_head(server_list);
instance != NULL;
instance = instance->next) {
if(instance->instance_id == instance_id) {
return instance;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
static lwm2m_status_t
lwm2m_callback(lwm2m_object_instance_t *object,
lwm2m_context_t *ctx)
{
int32_t value;
lwm2m_server_t *server;
server = (lwm2m_server_t *) object;
if(ctx->operation == LWM2M_OP_WRITE) {
LOG_DBG("Write to: %d\n", ctx->resource_id);
switch(ctx->resource_id) {
case LWM2M_SERVER_LIFETIME_ID:
lwm2m_object_read_int(ctx, ctx->inbuf->buffer, ctx->inbuf->size, &value);
server->lifetime = value;
break;
}
} else if(ctx->operation == LWM2M_OP_READ) {
switch(ctx->resource_id) {
case LWM2M_SERVER_SHORT_SERVER_ID:
lwm2m_object_write_int(ctx, server->server_id);
break;
case LWM2M_SERVER_LIFETIME_ID:
lwm2m_object_write_int(ctx, server->lifetime);
break;
}
} else if(ctx->operation == LWM2M_OP_EXECUTE) {
switch(ctx->resource_id) {
case LWM2M_SERVER_REG_UPDATE_TRIGGER_ID:
lwm2m_rd_client_update_triggered(ctx->request->src_ep);
break;
}
} else {
return LWM2M_STATUS_NOT_IMPLEMENTED;
}
return LWM2M_STATUS_OK;
}
/*---------------------------------------------------------------------------*/
lwm2m_server_t *
lwm2m_server_add(uint16_t instance_id, uint16_t server_id, uint32_t lifetime)
{
lwm2m_server_t *server;
int i;
for(server = list_head(server_list);
server;
server = (lwm2m_server_t *)server->instance.next) {
if(server->server_id == server_id) {
/* Found a matching server */
if(server->instance.instance_id != instance_id) {
/* Non-matching instance id */
LOG_DBG("non-matching instance id for server %u\n", server_id);
return NULL;
}
server->lifetime = lifetime;
return server;
} else if(server->instance.instance_id == instance_id) {
/* Right instance but wrong server id */
LOG_DBG("non-matching server id for instance %u\n", instance_id);
return NULL;
}
}
for(i = 0; i < MAX_COUNT; i++) {
if(server_instances[i].instance.instance_id == LWM2M_OBJECT_INSTANCE_NONE) {
server_instances[i].instance.callback = lwm2m_callback;
server_instances[i].instance.object_id = LWM2M_OBJECT_SERVER_ID;
server_instances[i].instance.instance_id = instance_id;
server_instances[i].instance.resource_ids = resources;
server_instances[i].instance.resource_count =
sizeof(resources) / sizeof(lwm2m_resource_id_t);
server_instances[i].server_id = server_id;
server_instances[i].lifetime = lifetime;
list_add(server_list, &server_instances[i].instance);
return &server_instances[i];
}
}
LOG_WARN("no space for more servers\n");
return NULL;
}
/*---------------------------------------------------------------------------*/
void
lwm2m_server_init(void)
{
int i;
LOG_INFO("init\n");
list_init(server_list);
for(i = 0; i < MAX_COUNT; i++) {
server_instances[i].instance.instance_id = LWM2M_OBJECT_INSTANCE_NONE;
}
lwm2m_engine_add_generic_object(&server_object);
}
/*---------------------------------------------------------------------------*/
/** @} */