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contiki/apps/oma-lwm2m/lwm2m-engine.c
Nicolas Tsiftes fa6771f058 Merge pull request #1677 from gebart/pr/lwm2m-instance-list 
oma-lwm2m: Add functionality to send object instance list as core link format
2016-09-06 16:50:11 +02:00

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/*
* Copyright (c) 2015, 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 oma-lwm2m
* @{
*/
/**
* \file
* Implementation of the Contiki OMA LWM2M engine
* \author
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include "contiki.h"
#include "lwm2m-engine.h"
#include "lwm2m-object.h"
#include "lwm2m-device.h"
#include "lwm2m-plain-text.h"
#include "lwm2m-json.h"
#include "rest-engine.h"
#include "er-coap-constants.h"
#include "er-coap-engine.h"
#include "oma-tlv.h"
#include "oma-tlv-reader.h"
#include "oma-tlv-writer.h"
#include "net/ipv6/uip-ds6.h"
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#if UIP_CONF_IPV6_RPL
#include "net/rpl/rpl.h"
#endif /* UIP_CONF_IPV6_RPL */
#define DEBUG DEBUG_NONE
#include "net/ip/uip-debug.h"
#ifndef LWM2M_ENGINE_CLIENT_ENDPOINT_PREFIX
#ifdef LWM2M_DEVICE_MODEL_NUMBER
#define LWM2M_ENGINE_CLIENT_ENDPOINT_PREFIX LWM2M_DEVICE_MODEL_NUMBER
#else /* LWM2M_DEVICE_MODEL_NUMBER */
#define LWM2M_ENGINE_CLIENT_ENDPOINT_PREFIX "Contiki-"
#endif /* LWM2M_DEVICE_MODEL_NUMBER */
#endif /* LWM2M_ENGINE_CLIENT_ENDPOINT_PREFIX */
#ifdef LWM2M_ENGINE_CONF_MAX_OBJECTS
#define MAX_OBJECTS LWM2M_ENGINE_CONF_MAX_OBJECTS
#else /* LWM2M_ENGINE_CONF_MAX_OBJECTS */
#define MAX_OBJECTS 10
#endif /* LWM2M_ENGINE_CONF_MAX_OBJECTS */
#define REMOTE_PORT UIP_HTONS(COAP_DEFAULT_PORT)
#define BS_REMOTE_PORT UIP_HTONS(5685)
static const lwm2m_object_t *objects[MAX_OBJECTS];
static char endpoint[32];
static char rd_data[128]; /* allocate some data for the RD */
PROCESS(lwm2m_rd_client, "LWM2M Engine");
static uip_ipaddr_t server_ipaddr;
static uint16_t server_port = REMOTE_PORT;
static uip_ipaddr_t bs_server_ipaddr;
static uint16_t bs_server_port = BS_REMOTE_PORT;
static uint8_t use_bootstrap = 0;
static uint8_t has_bootstrap_server_info = 0;
static uint8_t use_registration = 0;
static uint8_t has_registration_server_info = 0;
static uint8_t registered = 0;
static uint8_t bootstrapped = 0; /* bootstrap made... */
void lwm2m_device_init(void);
void lwm2m_security_init(void);
void lwm2m_server_init(void);
static const lwm2m_instance_t *get_first_instance_of_object(uint16_t id, lwm2m_context_t *context);
static const lwm2m_instance_t *get_instance(const lwm2m_object_t *object, lwm2m_context_t *context, int depth);
static const lwm2m_resource_t *get_resource(const lwm2m_instance_t *instance, lwm2m_context_t *context);
/*---------------------------------------------------------------------------*/
static void
client_chunk_handler(void *response)
{
#if (DEBUG) & DEBUG_PRINT
const uint8_t *chunk;
int len = coap_get_payload(response, &chunk);
PRINTF("|%.*s\n", len, (char *)chunk);
#endif /* (DEBUG) & DEBUG_PRINT */
}
/*---------------------------------------------------------------------------*/
static int
index_of(const uint8_t *data, int offset, int len, uint8_t c)
{
if(offset < 0) {
return offset;
}
for(; offset < len; offset++) {
if(data[offset] == c) {
return offset;
}
}
return -1;
}
/*---------------------------------------------------------------------------*/
static int
has_network_access(void)
{
#if UIP_CONF_IPV6_RPL
if(rpl_get_any_dag() == NULL) {
return 0;
}
#endif /* UIP_CONF_IPV6_RPL */
return 1;
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_use_bootstrap_server(int use)
{
use_bootstrap = use != 0;
if(use_bootstrap) {
process_poll(&lwm2m_rd_client);
}
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_use_registration_server(int use)
{
use_registration = use != 0;
if(use_registration) {
process_poll(&lwm2m_rd_client);
}
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_register_with_server(const uip_ipaddr_t *server, uint16_t port)
{
uip_ipaddr_copy(&server_ipaddr, server);
if(port != 0) {
server_port = port;
} else {
server_port = REMOTE_PORT;
}
has_registration_server_info = 1;
registered = 0;
if(use_registration) {
process_poll(&lwm2m_rd_client);
}
}
/*---------------------------------------------------------------------------*/
static int
update_registration_server(void)
{
if(has_registration_server_info) {
return 1;
}
#if UIP_CONF_IPV6_RPL
{
rpl_dag_t *dag;
/* Use the DAG id as server address if no other has been specified */
dag = rpl_get_any_dag();
if(dag != NULL) {
uip_ipaddr_copy(&server_ipaddr, &dag->dag_id);
server_port = REMOTE_PORT;
return 1;
}
}
#endif /* UIP_CONF_IPV6_RPL */
return 0;
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_register_with_bootstrap_server(const uip_ipaddr_t *server,
uint16_t port)
{
uip_ipaddr_copy(&bs_server_ipaddr, server);
if(port != 0) {
bs_server_port = port;
} else {
bs_server_port = BS_REMOTE_PORT;
}
has_bootstrap_server_info = 1;
bootstrapped = 0;
registered = 0;
if(use_bootstrap) {
process_poll(&lwm2m_rd_client);
}
}
/*---------------------------------------------------------------------------*/
static int
update_bootstrap_server(void)
{
if(has_bootstrap_server_info) {
return 1;
}
#if UIP_CONF_IPV6_RPL
{
rpl_dag_t *dag;
/* Use the DAG id as server address if no other has been specified */
dag = rpl_get_any_dag();
if(dag != NULL) {
uip_ipaddr_copy(&bs_server_ipaddr, &dag->dag_id);
bs_server_port = REMOTE_PORT;
return 1;
}
}
#endif /* UIP_CONF_IPV6_RPL */
return 0;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(lwm2m_rd_client, ev, data)
{
static coap_packet_t request[1]; /* This way the packet can be treated as pointer as usual. */
static struct etimer et;
PROCESS_BEGIN();
printf("RD Client started with endpoint '%s'\n", endpoint);
etimer_set(&et, 15 * CLOCK_SECOND);
while(1) {
PROCESS_YIELD();
if(etimer_expired(&et)) {
if(!has_network_access()) {
/* Wait until for a network to join */
} else if(use_bootstrap && bootstrapped == 0) {
if(update_bootstrap_server()) {
/* prepare request, TID is set by COAP_BLOCKING_REQUEST() */
coap_init_message(request, COAP_TYPE_CON, COAP_POST, 0);
coap_set_header_uri_path(request, "/bs");
coap_set_header_uri_query(request, endpoint);
printf("Registering ID with bootstrap server [");
uip_debug_ipaddr_print(&bs_server_ipaddr);
printf("]:%u as '%s'\n", uip_ntohs(bs_server_port), endpoint);
COAP_BLOCKING_REQUEST(&bs_server_ipaddr, bs_server_port, request,
client_chunk_handler);
bootstrapped++;
}
} else if(use_bootstrap && bootstrapped == 1) {
lwm2m_context_t context;
const lwm2m_instance_t *instance = NULL;
const lwm2m_resource_t *rsc;
const uint8_t *first;
int len;
PRINTF("*** Bootstrap - checking for server info...\n");
/* get the security object */
instance = get_first_instance_of_object(LWM2M_OBJECT_SECURITY_ID, &context);
if(instance != NULL) {
/* get the server URI */
context.resource_id = LWM2M_SECURITY_SERVER_URI;
rsc = get_resource(instance, &context);
first = lwm2m_object_get_resource_string(rsc, &context);
len = lwm2m_object_get_resource_strlen(rsc, &context);
if(first != NULL && len > 0) {
int start, end;
uip_ipaddr_t addr;
int32_t port;
uint8_t secure = 0;
PRINTF("**** Found security instance using: %.*s\n", len, first);
/* TODO Should verify it is a URI */
/* Check if secure */
secure = strncmp((const char *)first, "coaps:", 6) == 0;
/* Only IPv6 supported */
start = index_of(first, 0, len, '[');
end = index_of(first, start, len, ']');
if(start > 0 && end > start &&
uiplib_ipaddrconv((const char *)&first[start], &addr)) {
if(first[end + 1] == ':' &&
lwm2m_plain_text_read_int(first + end + 2, len - end - 2, &port)) {
} else if(secure) {
/**
* Secure CoAP should use a different port but for now
* the same port is used.
*/
port = COAP_DEFAULT_PORT;
} else {
port = COAP_DEFAULT_PORT;
}
PRINTF("Server address ");
PRINT6ADDR(&addr);
PRINTF(" port %" PRId32 "%s\n", port, secure ? " (secure)" : "");
if(secure) {
printf("Secure CoAP requested but not supported - can not bootstrap\n");
} else {
lwm2m_engine_register_with_server(&addr,
UIP_HTONS((uint16_t)port));
bootstrapped++;
}
} else {
printf("** failed to parse URI %.*s\n", len, first);
}
}
}
if(bootstrapped == 1) {
/* Not ready. Lets retry with the bootstrap server again */
bootstrapped = 0;
}
} else if(use_registration && !registered &&
update_registration_server()) {
int pos;
int len, i, j;
registered = 1;
/* prepare request, TID is set by COAP_BLOCKING_REQUEST() */
coap_init_message(request, COAP_TYPE_CON, COAP_POST, 0);
coap_set_header_uri_path(request, "/rd");
coap_set_header_uri_query(request, endpoint);
/* generate the rd data */
pos = 0;
for(i = 0; i < MAX_OBJECTS; i++) {
if(objects[i] != NULL) {
for(j = 0; j < objects[i]->count; j++) {
if(objects[i]->instances[j].flag & LWM2M_INSTANCE_FLAG_USED) {
len = snprintf(&rd_data[pos], sizeof(rd_data) - pos,
"%s<%d/%d>", pos > 0 ? "," : "",
objects[i]->id, objects[i]->instances[j].id);
if(len > 0 && len < sizeof(rd_data) - pos) {
pos += len;
}
}
}
}
}
coap_set_payload(request, (uint8_t *)rd_data, pos);
printf("Registering with [");
uip_debug_ipaddr_print(&server_ipaddr);
printf("]:%u lwm2m endpoint '%s': '%.*s'\n", uip_ntohs(server_port),
endpoint, pos, rd_data);
COAP_BLOCKING_REQUEST(&server_ipaddr, server_port, request,
client_chunk_handler);
}
/* for now only register once... registered = 0; */
etimer_set(&et, 15 * CLOCK_SECOND);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_init(void)
{
#ifdef LWM2M_ENGINE_CLIENT_ENDPOINT_NAME
snprintf(endpoint, sizeof(endpoint) - 1,
"?ep=" LWM2M_ENGINE_CLIENT_ENDPOINT_NAME);
#else /* LWM2M_ENGINE_CLIENT_ENDPOINT_NAME */
int len, i;
uint8_t state;
uip_ipaddr_t *ipaddr;
char client[sizeof(endpoint)];
len = strlen(LWM2M_ENGINE_CLIENT_ENDPOINT_PREFIX);
/* ensure that this fits with the hex-nums */
if(len > sizeof(client) - 13) {
len = sizeof(client) - 13;
}
memcpy(client, LWM2M_ENGINE_CLIENT_ENDPOINT_PREFIX, len);
/* pick an IP address that is PREFERRED or TENTATIVE */
ipaddr = NULL;
for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
state = uip_ds6_if.addr_list[i].state;
if(uip_ds6_if.addr_list[i].isused &&
(state == ADDR_TENTATIVE || state == ADDR_PREFERRED)) {
ipaddr = &(uip_ds6_if.addr_list[i]).ipaddr;
break;
}
}
if(ipaddr != NULL) {
for(i = 0; i < 6; i++) {
/* assume IPv6 for now */
uint8_t b = ipaddr->u8[10 + i];
client[len++] = (b >> 4) > 9 ? 'A' - 10 + (b >> 4) : '0' + (b >> 4);
client[len++] = (b & 0xf) > 9 ? 'A' - 10 + (b & 0xf) : '0' + (b & 0xf);
}
}
/* a zero at end of string */
client[len] = 0;
/* create endpoint */
snprintf(endpoint, sizeof(endpoint) - 1, "?ep=%s", client);
#endif /* LWM2M_ENGINE_CLIENT_ENDPOINT_NAME */
rest_init_engine();
process_start(&lwm2m_rd_client, NULL);
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_register_default_objects(void)
{
lwm2m_security_init();
lwm2m_server_init();
lwm2m_device_init();
}
/*---------------------------------------------------------------------------*/
static int
parse_next(const char **path, int *path_len, uint16_t *value)
{
char c;
*value = 0;
/* printf("parse_next: %p %d\n", *path, *path_len); */
if(*path_len == 0) {
return 0;
}
while(*path_len > 0) {
c = **path;
(*path)++;
*path_len = *path_len - 1;
if(c >= '0' && c <= '9') {
*value = *value * 10 + (c - '0');
} else if(c == '/') {
return 1;
} else {
/* error */
return -4;
}
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
lwm2m_engine_parse_context(const lwm2m_object_t *object,
const char *path, int path_len,
lwm2m_context_t *context)
{
int ret;
if(context == NULL || object == NULL || path == NULL) {
return 0;
}
memset(context, 0, sizeof(lwm2m_context_t));
/* get object id */
ret = 0;
ret += parse_next(&path, &path_len, &context->object_id);
ret += parse_next(&path, &path_len, &context->object_instance_id);
ret += parse_next(&path, &path_len, &context->resource_id);
/* Set default reader/writer */
context->reader = &lwm2m_plain_text_reader;
context->writer = &oma_tlv_writer;
return ret;
}
/*---------------------------------------------------------------------------*/
const lwm2m_object_t *
lwm2m_engine_get_object(uint16_t id)
{
int i;
for(i = 0; i < MAX_OBJECTS; i++) {
if(objects[i] != NULL && objects[i]->id == id) {
return objects[i];
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
int
lwm2m_engine_register_object(const lwm2m_object_t *object)
{
int i;
int found = 0;
for(i = 0; i < MAX_OBJECTS; i++) {
if(objects[i] == NULL) {
objects[i] = object;
found = 1;
break;
}
}
rest_activate_resource(lwm2m_object_get_coap_resource(object),
(char *)object->path);
return found;
}
/*---------------------------------------------------------------------------*/
static const lwm2m_instance_t *
get_first_instance_of_object(uint16_t id, lwm2m_context_t *context)
{
const lwm2m_object_t *object;
int i;
object = lwm2m_engine_get_object(id);
if(object == NULL) {
/* No object with the specified id found */
return NULL;
}
/* Initialize the context */
memset(context, 0, sizeof(lwm2m_context_t));
context->object_id = id;
for(i = 0; i < object->count; i++) {
if(object->instances[i].flag & LWM2M_INSTANCE_FLAG_USED) {
context->object_instance_id = object->instances[i].id;
context->object_instance_index = i;
return &object->instances[i];
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
static const lwm2m_instance_t *
get_instance(const lwm2m_object_t *object, lwm2m_context_t *context, int depth)
{
int i;
if(depth > 1) {
PRINTF("lwm2m: searching for instance %u\n", context->object_instance_id);
for(i = 0; i < object->count; i++) {
PRINTF(" Instance %d -> %u (used: %d)\n", i, object->instances[i].id,
(object->instances[i].flag & LWM2M_INSTANCE_FLAG_USED) != 0);
if(object->instances[i].id == context->object_instance_id &&
object->instances[i].flag & LWM2M_INSTANCE_FLAG_USED) {
context->object_instance_index = i;
return &object->instances[i];
}
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
static const lwm2m_resource_t *
get_resource(const lwm2m_instance_t *instance, lwm2m_context_t *context)
{
int i;
if(instance != NULL) {
PRINTF("lwm2m: searching for resource %u\n", context->resource_id);
for(i = 0; i < instance->count; i++) {
PRINTF(" Resource %d -> %u\n", i, instance->resources[i].id);
if(instance->resources[i].id == context->resource_id) {
context->resource_index = i;
return &instance->resources[i];
}
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
/**
* @brief Write a list of object instances as a CoRE Link-format list
*/
static int
write_object_instances_link(const lwm2m_object_t *object,
char *buffer, size_t size)
{
const lwm2m_instance_t *instance;
int len, rdlen, i;
PRINTF("</%d>", object->id);
rdlen = snprintf(buffer, size, "</%d>",
object->id);
if(rdlen < 0 || rdlen >= size) {
return -1;
}
for(i = 0; i < object->count; i++) {
if((object->instances[i].flag & LWM2M_INSTANCE_FLAG_USED) == 0) {
continue;
}
instance = &object->instances[i];
PRINTF(",</%d/%d>", object->id, instance->id);
len = snprintf(&buffer[rdlen], size - rdlen,
",<%d/%d>", object->id, instance->id);
rdlen += len;
if(len < 0 || rdlen >= size) {
return -1;
}
}
return rdlen;
}
/*---------------------------------------------------------------------------*/
static int
write_rd_link_data(const lwm2m_object_t *object,
const lwm2m_instance_t *instance,
char *buffer, size_t size)
{
const lwm2m_resource_t *resource;
int len, rdlen, i;
PRINTF("<%d/%d>", object->id, instance->id);
rdlen = snprintf(buffer, size, "<%d/%d>",
object->id, instance->id);
if(rdlen < 0 || rdlen >= size) {
return -1;
}
for(i = 0; i < instance->count; i++) {
resource = &instance->resources[i];
PRINTF(",<%d/%d/%d>", object->id, instance->id, resource->id);
len = snprintf(&buffer[rdlen], size - rdlen,
",<%d/%d/%d>", object->id, instance->id, resource->id);
rdlen += len;
if(len < 0 || rdlen >= size) {
return -1;
}
}
return rdlen;
}
/*---------------------------------------------------------------------------*/
static int
write_rd_json_data(const lwm2m_context_t *context,
const lwm2m_object_t *object,
const lwm2m_instance_t *instance,
char *buffer, size_t size)
{
const lwm2m_resource_t *resource;
const char *s = "";
int len, rdlen, i;
PRINTF("{\"e\":[");
rdlen = snprintf(buffer, size, "{\"e\":[");
if(rdlen < 0 || rdlen >= size) {
return -1;
}
for(i = 0, len = 0; i < instance->count; i++) {
resource = &instance->resources[i];
len = 0;
if(lwm2m_object_is_resource_string(resource)) {
const uint8_t *value;
uint16_t slen;
value = lwm2m_object_get_resource_string(resource, context);
slen = lwm2m_object_get_resource_strlen(resource, context);
if(value != NULL) {
PRINTF("%s{\"n\":\"%u\",\"sv\":\"%.*s\"}", s,
resource->id, slen, value);
len = snprintf(&buffer[rdlen], size - rdlen,
"%s{\"n\":\"%u\",\"sv\":\"%.*s\"}", s,
resource->id, slen, value);
}
} else if(lwm2m_object_is_resource_int(resource)) {
int32_t value;
if(lwm2m_object_get_resource_int(resource, context, &value)) {
PRINTF("%s{\"n\":\"%u\",\"v\":%" PRId32 "}", s,
resource->id, value);
len = snprintf(&buffer[rdlen], size - rdlen,
"%s{\"n\":\"%u\",\"v\":%" PRId32 "}", s,
resource->id, value);
}
} else if(lwm2m_object_is_resource_floatfix(resource)) {
int32_t value;
if(lwm2m_object_get_resource_floatfix(resource, context, &value)) {
PRINTF("%s{\"n\":\"%u\",\"v\":%" PRId32 "}", s, resource->id,
value / LWM2M_FLOAT32_FRAC);
len = snprintf(&buffer[rdlen], size - rdlen,
"%s{\"n\":\"%u\",\"v\":", s, resource->id);
rdlen += len;
if(len < 0 || rdlen >= size) {
return -1;
}
len = lwm2m_plain_text_write_float32fix((uint8_t *)&buffer[rdlen],
size - rdlen,
value, LWM2M_FLOAT32_BITS);
if(len == 0) {
return -1;
}
rdlen += len;
if(rdlen < size) {
buffer[rdlen] = '}';
}
len = 1;
}
} else if(lwm2m_object_is_resource_boolean(resource)) {
int value;
if(lwm2m_object_get_resource_boolean(resource, context, &value)) {
PRINTF("%s{\"n\":\"%u\",\"bv\":%s}", s, resource->id,
value ? "true" : "false");
len = snprintf(&buffer[rdlen], size - rdlen,
"%s{\"n\":\"%u\",\"bv\":%s}", s, resource->id,
value ? "true" : "false");
}
}
rdlen += len;
if(len < 0 || rdlen >= size) {
return -1;
}
if(len > 0) {
s = ",";
}
}
PRINTF("]}\n");
len = snprintf(&buffer[rdlen], size - rdlen, "]}");
rdlen += len;
if(len < 0 || rdlen >= size) {
return -1;
}
return rdlen;
}
/*---------------------------------------------------------------------------*/
/**
* @brief Set the writer pointer to the proper writer based on the Accept: header
*
* @param[in] context LWM2M context to operate on
* @param[in] accept Accept type number from CoAP headers
*
* @return The content type of the response if the selected writer is used
*/
static unsigned int
lwm2m_engine_select_writer(lwm2m_context_t *context, unsigned int accept)
{
switch(accept) {
case LWM2M_TLV:
context->writer = &oma_tlv_writer;
break;
case LWM2M_TEXT_PLAIN:
case TEXT_PLAIN:
context->writer = &lwm2m_plain_text_writer;
break;
case LWM2M_JSON:
case APPLICATION_JSON:
context->writer = &lwm2m_json_writer;
break;
default:
PRINTF("Unknown Accept type %u, using LWM2M plain text\n", accept);
context->writer = &lwm2m_plain_text_writer;
/* Set the response type to plain text */
accept = LWM2M_TEXT_PLAIN;
break;
}
return accept;
}
/*---------------------------------------------------------------------------*/
/**
* @brief Set the reader pointer to the proper reader based on the Content-format: header
*
* @param[in] context LWM2M context to operate on
* @param[in] content_format Content-type type number from CoAP headers
*/
static void
lwm2m_engine_select_reader(lwm2m_context_t *context, unsigned int content_format)
{
switch(content_format) {
case LWM2M_TLV:
context->reader = &oma_tlv_reader;
break;
case LWM2M_TEXT_PLAIN:
case TEXT_PLAIN:
context->reader = &lwm2m_plain_text_reader;
break;
default:
PRINTF("Unknown content type %u, using LWM2M plain text\n", accept);
context->reader = &lwm2m_plain_text_reader;
break;
}
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_handler(const lwm2m_object_t *object,
void *request, void *response,
uint8_t *buffer, uint16_t preferred_size,
int32_t *offset)
{
int len;
const char *url;
unsigned int format;
unsigned int accept;
unsigned int content_type;
int depth;
lwm2m_context_t context;
rest_resource_flags_t method;
const lwm2m_instance_t *instance;
#if (DEBUG) & DEBUG_PRINT
const char *method_str;
#endif /* (DEBUG) & DEBUG_PRINT */
method = REST.get_method_type(request);
len = REST.get_url(request, &url);
if(!REST.get_header_content_type(request, &format)) {
PRINTF("No format given. Assume text plain...\n");
format = LWM2M_TEXT_PLAIN;
} else if(format == TEXT_PLAIN) {
/* CoAP content format text plain - assume LWM2M text plain */
format = LWM2M_TEXT_PLAIN;
}
if(!REST.get_header_accept(request, &accept)) {
PRINTF("No Accept header, using same as Content-format...\n");
accept = format;
}
depth = lwm2m_engine_parse_context(object, url, len, &context);
PRINTF("Context: %u/%u/%u found: %d\n", context.object_id,
context.object_instance_id, context.resource_id, depth);
/* Select reader and writer based on provided Content type and Accept headers */
lwm2m_engine_select_reader(&context, format);
content_type = lwm2m_engine_select_writer(&context, accept);
#if (DEBUG) & DEBUG_PRINT
/* for debugging */
if(method == METHOD_GET) {
method_str = "GET";
} else if(method == METHOD_POST) {
method_str = "POST";
} else if(method == METHOD_PUT) {
method_str = "PUT";
} else if(method == METHOD_DELETE) {
method_str = "DELETE";
} else {
method_str = "UNKNOWN";
}
PRINTF("%s Called Path:%.*s Format:%d ID:%d bsize:%u\n", method_str, len,
url, format, object->id, preferred_size);
if(format == LWM2M_TEXT_PLAIN) {
/* a string */
const uint8_t *data;
int plen = REST.get_request_payload(request, &data);
if(plen > 0) {
PRINTF("Data: '%.*s'\n", plen, (char *)data);
}
}
#endif /* (DEBUG) & DEBUG_PRINT */
instance = get_instance(object, &context, depth);
/* from POST */
if(depth > 1 && instance == NULL) {
if(method != METHOD_PUT && method != METHOD_POST) {
PRINTF("Error - do not have instance %d\n", context.object_instance_id);
REST.set_response_status(response, NOT_FOUND_4_04);
return;
} else {
const uint8_t *data;
int i, len, plen, pos;
oma_tlv_t tlv;
PRINTF(">>> CREATE ? %d/%d\n", context.object_id,
context.object_instance_id);
for(i = 0; i < object->count; i++) {
if((object->instances[i].flag & LWM2M_INSTANCE_FLAG_USED) == 0) {
/* allocate this instance */
object->instances[i].flag |= LWM2M_INSTANCE_FLAG_USED;
object->instances[i].id = context.object_instance_id;
context.object_instance_index = i;
PRINTF("Created instance: %d\n", context.object_instance_id);
REST.set_response_status(response, CREATED_2_01);
instance = &object->instances[i];
break;
}
}
if(instance == NULL) {
/* could for some reason not create the instance */
REST.set_response_status(response, NOT_ACCEPTABLE_4_06);
return;
}
plen = REST.get_request_payload(request, &data);
if(plen == 0) {
/* do nothing more */
return;
}
PRINTF("Payload: ");
for(i = 0; i < plen; i++) {
PRINTF("%02x", data[i]);
}
PRINTF("\n");
pos = 0;
do {
len = oma_tlv_read(&tlv, (uint8_t *)&data[pos], plen - pos);
PRINTF("Found TLV type=%u id=%u len=%lu\n",
tlv.type, tlv.id, (unsigned long)tlv.length);
/* here we need to do callbacks or write value */
if(tlv.type == OMA_TLV_TYPE_RESOURCE) {
context.resource_id = tlv.id;
const lwm2m_resource_t *rsc = get_resource(instance, &context);
if(rsc != NULL) {
/* write the value to the resource */
if(lwm2m_object_is_resource_string(rsc)) {
PRINTF(" new string value for /%d/%d/%d = %.*s\n",
context.object_id, context.object_instance_id,
context.resource_id, (int)tlv.length, tlv.value);
lwm2m_object_set_resource_string(rsc, &context,
tlv.length, tlv.value);
} else if(lwm2m_object_is_resource_int(rsc)) {
PRINTF(" new int value for /%d/%d/%d = %" PRId32 "\n",
context.object_id, context.object_instance_id,
context.resource_id, oma_tlv_get_int32(&tlv));
lwm2m_object_set_resource_int(rsc, &context,
oma_tlv_get_int32(&tlv));
} else if(lwm2m_object_is_resource_floatfix(rsc)) {
int32_t value;
if(oma_tlv_float32_to_fix(&tlv, &value, LWM2M_FLOAT32_BITS)) {
PRINTF(" new float value for /%d/%d/%d = %" PRId32 "\n",
context.object_id, context.object_instance_id,
context.resource_id, value >> LWM2M_FLOAT32_BITS);
lwm2m_object_set_resource_floatfix(rsc, &context, value);
} else {
PRINTF(" new float value for /%d/%d/%d: FAILED\n",
context.object_id, context.object_instance_id,
context.resource_id);
}
} else if(lwm2m_object_is_resource_boolean(rsc)) {
PRINTF(" new boolean value for /%d/%d/%d = %" PRId32 "\n",
context.object_id, context.object_instance_id,
context.resource_id, oma_tlv_get_int32(&tlv));
lwm2m_object_set_resource_boolean(rsc, &context,
oma_tlv_get_int32(&tlv) != 0);
}
}
}
pos = pos + len;
} while(len > 0 && pos < plen);
}
return;
}
if(depth == 3) {
const lwm2m_resource_t *resource = get_resource(instance, &context);
size_t content_len = 0;
if(resource == NULL) {
PRINTF("Error - do not have resource %d\n", context.resource_id);
REST.set_response_status(response, NOT_FOUND_4_04);
return;
}
/* HANDLE PUT */
if(method == METHOD_PUT) {
if(lwm2m_object_is_resource_callback(resource)) {
if(resource->value.callback.write != NULL) {
/* pick a reader ??? */
if(format == LWM2M_TEXT_PLAIN) {
/* a string */
const uint8_t *data;
int plen = REST.get_request_payload(request, &data);
context.reader = &lwm2m_plain_text_reader;
PRINTF("PUT Callback with data: '%.*s'\n", plen, data);
/* no specific reader for plain text */
content_len = resource->value.callback.write(&context, data, plen,
buffer, preferred_size);
PRINTF("content_len:%u\n", (unsigned int)content_len);
REST.set_response_status(response, CHANGED_2_04);
} else {
PRINTF("PUT callback with format %d\n", format);
REST.set_response_status(response, NOT_ACCEPTABLE_4_06);
}
} else {
PRINTF("PUT - no write callback\n");
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
}
} else {
PRINTF("PUT on non-callback resource!\n");
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
}
/* HANDLE GET */
} else if(method == METHOD_GET) {
if(lwm2m_object_is_resource_string(resource)) {
const uint8_t *value;
value = lwm2m_object_get_resource_string(resource, &context);
if(value != NULL) {
uint16_t len = lwm2m_object_get_resource_strlen(resource, &context);
PRINTF("Get string value: %.*s\n", (int)len, (char *)value);
content_len = context.writer->write_string(&context, buffer,
preferred_size, (const char *)value, len);
}
} else if(lwm2m_object_is_resource_int(resource)) {
int32_t value;
if(lwm2m_object_get_resource_int(resource, &context, &value)) {
content_len = context.writer->write_int(&context, buffer, preferred_size, value);
}
} else if(lwm2m_object_is_resource_floatfix(resource)) {
int32_t value;
if(lwm2m_object_get_resource_floatfix(resource, &context, &value)) {
/* export FLOATFIX */
PRINTF("Exporting %d-bit fix as float: %" PRId32 "\n",
LWM2M_FLOAT32_BITS, value);
content_len = context.writer->write_float32fix(&context, buffer,
preferred_size, value, LWM2M_FLOAT32_BITS);
}
} else if(lwm2m_object_is_resource_callback(resource)) {
if(resource->value.callback.read != NULL) {
content_len = resource->value.callback.read(&context,
buffer, preferred_size);
} else {
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
return;
}
}
if(content_len > 0) {
REST.set_response_payload(response, buffer, content_len);
REST.set_header_content_type(response, content_type);
} else {
/* failed to produce output - it is an internal error */
REST.set_response_status(response, INTERNAL_SERVER_ERROR_5_00);
}
/* Handle POST */
} else if(method == METHOD_POST) {
if(lwm2m_object_is_resource_callback(resource)) {
if(resource->value.callback.exec != NULL) {
const uint8_t *data;
int plen = REST.get_request_payload(request, &data);
PRINTF("Execute Callback with data: '%.*s'\n", plen, data);
content_len = resource->value.callback.exec(&context,
data, plen,
buffer, preferred_size);
REST.set_response_status(response, CHANGED_2_04);
} else {
PRINTF("Execute callback - no exec callback\n");
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
}
} else {
PRINTF("Resource post but no callback resource\n");
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
}
}
} else if(depth == 2) {
/* produce an instance response */
if(method != METHOD_GET) {
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
} else if(instance == NULL) {
REST.set_response_status(response, NOT_FOUND_4_04);
} else {
int rdlen;
if(accept == APPLICATION_LINK_FORMAT) {
rdlen = write_rd_link_data(object, instance,
(char *)buffer, preferred_size);
} else {
rdlen = write_rd_json_data(&context, object, instance,
(char *)buffer, preferred_size);
}
if(rdlen < 0) {
PRINTF("Failed to generate instance response\n");
REST.set_response_status(response, SERVICE_UNAVAILABLE_5_03);
return;
}
REST.set_response_payload(response, buffer, rdlen);
if(accept == APPLICATION_LINK_FORMAT) {
REST.set_header_content_type(response, REST.type.APPLICATION_LINK_FORMAT);
} else {
REST.set_header_content_type(response, LWM2M_JSON);
}
}
} else if(depth == 1) {
/* produce a list of instances */
if(method != METHOD_GET) {
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
} else {
int rdlen;
PRINTF("Sending instance list for object %u\n", object->id);
/* TODO: if(accept == APPLICATION_LINK_FORMAT) { */
rdlen = write_object_instances_link(object, (char *)buffer, preferred_size);
if(rdlen < 0) {
PRINTF("Failed to generate object response\n");
REST.set_response_status(response, SERVICE_UNAVAILABLE_5_03);
return;
}
REST.set_header_content_type(response, REST.type.APPLICATION_LINK_FORMAT);
REST.set_response_payload(response, buffer, rdlen);
}
}
}
/*---------------------------------------------------------------------------*/
void
lwm2m_engine_delete_handler(const lwm2m_object_t *object, void *request,
void *response, uint8_t *buffer,
uint16_t preferred_size, int32_t *offset)
{
int len;
const char *url;
lwm2m_context_t context;
len = REST.get_url(request, &url);
PRINTF("*** DELETE URI:'%.*s' called... - responding with DELETED.\n",
len, url);
len = lwm2m_engine_parse_context(object, url, len, &context);
PRINTF("Context: %u/%u/%u found: %d\n", context.object_id,
context.object_instance_id, context.resource_id, len);
REST.set_response_status(response, DELETED_2_02);
}
/*---------------------------------------------------------------------------*/
/** @} */
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