/*
* Copyright (c) 2017 Linaro Limited
* Copyright (c) 2018-2019 Foundries.io
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* Uses some original concepts by:
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
* Joel Hoglund <joel@sics.se>
*/
/*
* TODO:
* - Handle Resource ObjLink type
*/
#define LOG_MODULE_NAME net_lwm2m_engine
#define LOG_LEVEL CONFIG_LWM2M_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(LOG_MODULE_NAME);
#include <zephyr/types.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <init.h>
#include <misc/printk.h>
#include <net/net_ip.h>
#include <net/http_parser_url.h>
#include <net/socket.h>
#if defined(CONFIG_LWM2M_DTLS_SUPPORT)
#include <net/tls_credentials.h>
#endif
#if defined(CONFIG_DNS_RESOLVER)
#include <net/dns_resolve.h>
#endif
#include "lwm2m_object.h"
#include "lwm2m_engine.h"
#include "lwm2m_rw_plain_text.h"
#include "lwm2m_rw_oma_tlv.h"
#ifdef CONFIG_LWM2M_RW_JSON_SUPPORT
#include "lwm2m_rw_json.h"
#endif
#ifdef CONFIG_LWM2M_RD_CLIENT_SUPPORT
#include "lwm2m_rd_client.h"
#endif
#define ENGINE_UPDATE_INTERVAL K_MSEC(500)
#define WELL_KNOWN_CORE_PATH "</.well-known/core>"
/*
* TODO: to implement a way for clients to specify alternate path
* via Kconfig (LwM2M specification 8.2.2 Alternate Path)
*
* For now, in order to inform server we support JSON format, we have to
* report 'ct=11543' to the server. '</>' is required in order to append
* content attribute. And resource type attribute is appended because of
* Eclipse wakaama will reject the registration when 'rt="oma.lwm2m"' is
* missing.
*/
#define RESOURCE_TYPE ";rt=\"oma.lwm2m\""
#if defined(CONFIG_LWM2M_RW_JSON_SUPPORT)
#define REG_PREFACE "</>" RESOURCE_TYPE \
";ct=" STRINGIFY(LWM2M_FORMAT_OMA_JSON)
#else
#define REG_PREFACE ""
#endif
#if defined(CONFIG_COAP_EXTENDED_OPTIONS_LEN)
#define COAP_OPTION_BUF_LEN (CONFIG_COAP_EXTENDED_OPTIONS_LEN_VALUE + 1)
#else
#define COAP_OPTION_BUF_LEN 13
#endif
/* TODO: grab this from server obj */
#define DEFAULT_SERVER_PMIN 10
#define DEFAULT_SERVER_PMAX 60
#define MAX_TOKEN_LEN 8
struct observe_node {
sys_snode_t node;
struct lwm2m_ctx *ctx;
struct lwm2m_obj_path path;
u8_t token[MAX_TOKEN_LEN];
s64_t event_timestamp;
s64_t last_timestamp;
u32_t min_period_sec;
u32_t max_period_sec;
u32_t counter;
u16_t format;
u8_t tkl;
};
struct notification_attrs {
/* use to determine which value is set */
float32_value_t gt;
float32_value_t lt;
float32_value_t st;
s32_t pmin;
s32_t pmax;
u8_t flags;
};
static struct observe_node observe_node_data[CONFIG_LWM2M_ENGINE_MAX_OBSERVER];
#define MAX_PERIODIC_SERVICE 10
struct service_node {
sys_snode_t node;
k_work_handler_t service_work;
u32_t min_call_period;
u64_t last_timestamp;
};
static struct service_node service_node_data[MAX_PERIODIC_SERVICE];
static sys_slist_t engine_obj_list;
static sys_slist_t engine_obj_inst_list;
static sys_slist_t engine_observer_list;
static sys_slist_t engine_service_list;
static K_THREAD_STACK_DEFINE(engine_thread_stack,
CONFIG_LWM2M_ENGINE_STACK_SIZE);
static struct k_thread engine_thread_data;
#define MAX_POLL_FD CONFIG_NET_SOCKETS_POLL_MAX
static struct lwm2m_ctx *sock_ctx[MAX_POLL_FD];
static struct pollfd sock_fds[MAX_POLL_FD];
static int sock_nfds;
#define NUM_BLOCK1_CONTEXT CONFIG_LWM2M_NUM_BLOCK1_CONTEXT
/* TODO: figure out what's correct value */
#define TIMEOUT_BLOCKWISE_TRANSFER K_SECONDS(30)
#define GET_BLOCK_NUM(v) ((v) >> 4)
#define GET_BLOCK_SIZE(v) (((v) & 0x7))
#define GET_MORE(v) (!!((v) & 0x08))
struct block_context {
struct coap_block_context ctx;
s64_t timestamp;
u8_t token[8];
u8_t tkl;
};
static struct block_context block1_contexts[NUM_BLOCK1_CONTEXT];
/* write-attribute related definitons */
static const char * const LWM2M_ATTR_STR[] = { "pmin", "pmax",
"gt", "lt", "st" };
static const u8_t LWM2M_ATTR_LEN[] = { 4, 4, 2, 2, 2 };
static struct lwm2m_attr write_attr_pool[CONFIG_LWM2M_NUM_ATTR];
static struct lwm2m_engine_obj *get_engine_obj(int obj_id);
static struct lwm2m_engine_obj_inst *get_engine_obj_inst(int obj_id,
int obj_inst_id);
/* Shared set of in-flight LwM2M messages */
static struct lwm2m_message messages[CONFIG_LWM2M_ENGINE_MAX_MESSAGES];
/* for debugging: to print IP addresses */
char *lwm2m_sprint_ip_addr(const struct sockaddr *addr)
{
static char buf[NET_IPV6_ADDR_LEN];
#if defined(CONFIG_NET_IPV6)
if (addr->sa_family == AF_INET6) {
return net_addr_ntop(AF_INET6, &net_sin6(addr)->sin6_addr,
buf, sizeof(buf));
}
#endif
#if defined(CONFIG_NET_IPV4)
if (addr->sa_family == AF_INET) {
return net_addr_ntop(AF_INET, &net_sin(addr)->sin_addr,
buf, sizeof(buf));
}
#endif
LOG_ERR("Unknown IP address family:%d", addr->sa_family);
return NULL;
}
static u8_t to_hex_digit(u8_t digit)
{
if (digit >= 10U) {
return digit - 10U + 'a';
}
return digit + '0';
}
static char *sprint_token(const u8_t *token, u8_t tkl)
{
static char buf[32];
char *ptr = buf;
if (token && tkl != LWM2M_MSG_TOKEN_LEN_SKIP) {
int i;
tkl = MIN(tkl, sizeof(buf) / 2 - 1);
for (i = 0; i < tkl; i++) {
*ptr++ = to_hex_digit(token[i] >> 4);
*ptr++ = to_hex_digit(token[i] & 0x0F);
}
*ptr = '\0';
} else if (tkl == LWM2M_MSG_TOKEN_LEN_SKIP) {
strcpy(buf, "[skip-token]");
} else {
strcpy(buf, "[no-token]");
}
return buf;
}
/* block-wise transfer functions */
enum coap_block_size lwm2m_default_block_size(void)
{
switch (CONFIG_LWM2M_COAP_BLOCK_SIZE) {
case 16:
return COAP_BLOCK_16;
case 32:
return COAP_BLOCK_32;
case 64:
return COAP_BLOCK_64;
case 128:
return COAP_BLOCK_128;
case 256:
return COAP_BLOCK_256;
case 512:
return COAP_BLOCK_512;
case 1024:
return COAP_BLOCK_1024;
}
return COAP_BLOCK_256;
}
static int
init_block_ctx(const u8_t *token, u8_t tkl, struct block_context **ctx)
{
int i;
s64_t timestamp;
*ctx = NULL;
timestamp = k_uptime_get();
for (i = 0; i < NUM_BLOCK1_CONTEXT; i++) {
if (block1_contexts[i].tkl == 0U) {
*ctx = &block1_contexts[i];
break;
}
if (timestamp - block1_contexts[i].timestamp >
TIMEOUT_BLOCKWISE_TRANSFER) {
*ctx = &block1_contexts[i];
/* TODO: notify application for block
* transfer timeout
*/
break;
}
}
if (*ctx == NULL) {
LOG_ERR("Cannot find free block context");
return -ENOMEM;
}
(*ctx)->tkl = tkl;
memcpy((*ctx)->token, token, tkl);
coap_block_transfer_init(&(*ctx)->ctx, lwm2m_default_block_size(), 0);
(*ctx)->timestamp = timestamp;
return 0;
}
static int
get_block_ctx(const u8_t *token, u8_t tkl, struct block_context **ctx)
{
int i;
*ctx = NULL;
for (i = 0; i < NUM_BLOCK1_CONTEXT; i++) {
if (block1_contexts[i].tkl == tkl &&
memcmp(token, block1_contexts[i].token, tkl) == 0) {
*ctx = &block1_contexts[i];
/* refresh timestmap */
(*ctx)->timestamp = k_uptime_get();
break;
}
}
if (*ctx == NULL) {
LOG_ERR("Cannot find block context");
return -ENOENT;
}
return 0;
}
static void free_block_ctx(struct block_context *ctx)
{
if (ctx == NULL) {
return;
}
ctx->tkl = 0U;
}
/* observer functions */
static int update_attrs(void *ref, struct notification_attrs *out)
{
int i;
for (i = 0; i < CONFIG_LWM2M_NUM_ATTR; i++) {
if (ref != write_attr_pool[i].ref) {
continue;
}
switch (write_attr_pool[i].type) {
case LWM2M_ATTR_PMIN:
out->pmin = write_attr_pool[i].int_val;
break;
case LWM2M_ATTR_PMAX:
out->pmax = write_attr_pool[i].int_val;
break;
case LWM2M_ATTR_LT:
out->lt = write_attr_pool[i].float_val;
break;
case LWM2M_ATTR_GT:
out->gt = write_attr_pool[i].float_val;
break;
case LWM2M_ATTR_STEP:
out->st = write_attr_pool[i].float_val;
break;
default:
LOG_ERR("Unrecognize attr: %d",
write_attr_pool[i].type);
return -EINVAL;
}
/* mark as set */
out->flags |= BIT(write_attr_pool[i].type);
}
return 0;
}
static void clear_attrs(void *ref)
{
int i;
for (i = 0; i < CONFIG_LWM2M_NUM_ATTR; i++) {
if (ref == write_attr_pool[i].ref) {
(void)memset(&write_attr_pool[i], 0,
sizeof(write_attr_pool[i]));
}
}
}
int lwm2m_notify_observer(u16_t obj_id, u16_t obj_inst_id, u16_t res_id)
{
struct observe_node *obs;
int ret = 0;
/* look for observers which match our resource */
SYS_SLIST_FOR_EACH_CONTAINER(&engine_observer_list, obs, node) {
if (obs->path.obj_id == obj_id &&
obs->path.obj_inst_id == obj_inst_id &&
(obs->path.level < 3 ||
obs->path.res_id == res_id)) {
/* update the event time for this observer */
obs->event_timestamp = k_uptime_get();
LOG_DBG("NOTIFY EVENT %u/%u/%u",
obj_id, obj_inst_id, res_id);
ret++;
}
}
return ret;
}
int lwm2m_notify_observer_path(struct lwm2m_obj_path *path)
{
return lwm2m_notify_observer(path->obj_id, path->obj_inst_id,
path->res_id);
}
static int engine_add_observer(struct lwm2m_message *msg,
const u8_t *token, u8_t tkl,
u16_t format)
{
struct lwm2m_engine_obj *obj = NULL;
struct lwm2m_engine_obj_field *obj_field = NULL;
struct lwm2m_engine_obj_inst *obj_inst = NULL;
struct observe_node *obs;
struct notification_attrs attrs = {
.flags = BIT(LWM2M_ATTR_PMIN) | BIT(LWM2M_ATTR_PMAX),
.pmin = DEFAULT_SERVER_PMIN,
.pmax = DEFAULT_SERVER_PMAX,
};
int i, ret;
if (!msg || !msg->ctx) {
LOG_ERR("valid lwm2m message is required");
return -EINVAL;
}
if (!token || (tkl == 0U || tkl > MAX_TOKEN_LEN)) {
LOG_ERR("token(%p) and token length(%u) must be valid.",
token, tkl);
return -EINVAL;
}
/* TODO: get server object for default pmin/pmax
* and observe dup checking
*/
/* make sure this observer doesn't exist already */
SYS_SLIST_FOR_EACH_CONTAINER(&engine_observer_list, obs, node) {
/* TODO: distinguish server object */
if (obs->ctx == msg->ctx &&
memcmp(&obs->path, &msg->path, sizeof(msg->path)) == 0) {
/* quietly update the token information */
memcpy(obs->token, token, tkl);
obs->tkl = tkl;
LOG_DBG("OBSERVER DUPLICATE %u/%u/%u(%u) [%s]",
msg->path.obj_id, msg->path.obj_inst_id,
msg->path.res_id, msg->path.level,
lwm2m_sprint_ip_addr(&msg->ctx->remote_addr));
return 0;
}
}
/* check if object exists */
obj = get_engine_obj(msg->path.obj_id);
if (!obj) {
LOG_ERR("unable to find obj: %u", msg->path.obj_id);
return -ENOENT;
}
ret = update_attrs(obj, &attrs);
if (ret < 0) {
return ret;
}
/* check if object instance exists */
if (msg->path.level >= 2U) {
obj_inst = get_engine_obj_inst(msg->path.obj_id,
msg->path.obj_inst_id);
if (!obj_inst) {
LOG_ERR("unable to find obj_inst: %u/%u",
msg->path.obj_id, msg->path.obj_inst_id);
return -ENOENT;
}
ret = update_attrs(obj_inst, &attrs);
if (ret < 0) {
return ret;
}
}
/* check if resource exists */
if (msg->path.level >= 3U) {
for (i = 0; i < obj_inst->resource_count; i++) {
if (obj_inst->resources[i].res_id == msg->path.res_id) {
break;
}
}
if (i == obj_inst->resource_count) {
LOG_ERR("unable to find res_id: %u/%u/%u",
msg->path.obj_id, msg->path.obj_inst_id,
msg->path.res_id);
return -ENOENT;
}
/* load object field data */
obj_field = lwm2m_get_engine_obj_field(obj,
obj_inst->resources[i].res_id);
if (!obj_field) {
LOG_ERR("unable to find obj_field: %u/%u/%u",
msg->path.obj_id, msg->path.obj_inst_id,
msg->path.res_id);
return -ENOENT;
}
/* check for READ permission on matching resource */
if (!LWM2M_HAS_PERM(obj_field, LWM2M_PERM_R)) {
return -EPERM;
}
ret = update_attrs(&obj_inst->resources[i], &attrs);
if (ret < 0) {
return ret;
}
}
/* find an unused observer index node */
for (i = 0; i < CONFIG_LWM2M_ENGINE_MAX_OBSERVER; i++) {
if (!observe_node_data[i].ctx) {
break;
}
}
/* couldn't find an index */
if (i == CONFIG_LWM2M_ENGINE_MAX_OBSERVER) {
return -ENOMEM;
}
/* copy the values and add it to the list */
observe_node_data[i].ctx = msg->ctx;
memcpy(&observe_node_data[i].path, &msg->path, sizeof(msg->path));
memcpy(observe_node_data[i].token, token, tkl);
observe_node_data[i].tkl = tkl;
observe_node_data[i].last_timestamp = k_uptime_get();
observe_node_data[i].event_timestamp =
observe_node_data[i].last_timestamp;
observe_node_data[i].min_period_sec = attrs.pmin;
observe_node_data[i].max_period_sec = MAX(attrs.pmax, attrs.pmin);
observe_node_data[i].format = format;
observe_node_data[i].counter = 1U;
sys_slist_append(&engine_observer_list,
&observe_node_data[i].node);
LOG_DBG("OBSERVER ADDED %u/%u/%u(%u) token:'%s' addr:%s",
msg->path.obj_id, msg->path.obj_inst_id,
msg->path.res_id, msg->path.level,
sprint_token(token, tkl),
lwm2m_sprint_ip_addr(&msg->ctx->remote_addr));
return 0;
}
static int engine_remove_observer(const u8_t *token, u8_t tkl)
{
struct observe_node *obs, *found_obj = NULL;
sys_snode_t *prev_node = NULL;
if (!token || (tkl == 0U || tkl > MAX_TOKEN_LEN)) {
LOG_ERR("token(%p) and token length(%u) must be valid.",
token, tkl);
return -EINVAL;
}
/* find the node index */
SYS_SLIST_FOR_EACH_CONTAINER(&engine_observer_list, obs, node) {
if (memcmp(obs->token, token, tkl) == 0) {
found_obj = obs;
break;
}
prev_node = &obs->node;
}
if (!found_obj) {
return -ENOENT;
}
sys_slist_remove(&engine_observer_list, prev_node, &found_obj->node);
(void)memset(found_obj, 0, sizeof(*found_obj));
LOG_DBG("observer '%s' removed", sprint_token(token, tkl));
return 0;
}
static void engine_remove_observer_by_id(u16_t obj_id, s32_t obj_inst_id)
{
struct observe_node *obs, *tmp;
sys_snode_t *prev_node = NULL;
/* remove observer instances accordingly */
SYS_SLIST_FOR_EACH_CONTAINER_SAFE(
&engine_observer_list, obs, tmp, node) {
if (!(obj_id == obs->path.obj_id &&
obj_inst_id == obs->path.obj_inst_id)) {
prev_node = &obs->node;
continue;
}
sys_slist_remove(&engine_observer_list, prev_node, &obs->node);
(void)memset(obs, 0, sizeof(*obs));
}
}
/* engine object */
void lwm2m_register_obj(struct lwm2m_engine_obj *obj)
{
sys_slist_append(&engine_obj_list, &obj->node);
}
void lwm2m_unregister_obj(struct lwm2m_engine_obj *obj)
{
engine_remove_observer_by_id(obj->obj_id, -1);
sys_slist_find_and_remove(&engine_obj_list, &obj->node);
}
static struct lwm2m_engine_obj *get_engine_obj(int obj_id)
{
struct lwm2m_engine_obj *obj;
SYS_SLIST_FOR_EACH_CONTAINER(&engine_obj_list, obj, node) {
if (obj->obj_id == obj_id) {
return obj;
}
}
return NULL;
}
struct lwm2m_engine_obj_field *
lwm2m_get_engine_obj_field(struct lwm2m_engine_obj *obj, int res_id)
{
int i;
if (obj && obj->fields && obj->field_count > 0) {
for (i = 0; i < obj->field_count; i++) {
if (obj->fields[i].res_id == res_id) {
return &obj->fields[i];
}
}
}
return NULL;
}
/* engine object instance */
static void engine_register_obj_inst(struct lwm2m_engine_obj_inst *obj_inst)
{
sys_slist_append(&engine_obj_inst_list, &obj_inst->node);
}
static void engine_unregister_obj_inst(struct lwm2m_engine_obj_inst *obj_inst)
{
engine_remove_observer_by_id(
obj_inst->obj->obj_id, obj_inst->obj_inst_id);
sys_slist_find_and_remove(&engine_obj_inst_list, &obj_inst->node);
}
static struct lwm2m_engine_obj_inst *get_engine_obj_inst(int obj_id,
int obj_inst_id)
{
struct lwm2m_engine_obj_inst *obj_inst;
SYS_SLIST_FOR_EACH_CONTAINER(&engine_obj_inst_list, obj_inst,
node) {
if (obj_inst->obj->obj_id == obj_id &&
obj_inst->obj_inst_id == obj_inst_id) {
return obj_inst;
}
}
return NULL;
}
static struct lwm2m_engine_obj_inst *
next_engine_obj_inst(int obj_id, int obj_inst_id)
{
struct lwm2m_engine_obj_inst *obj_inst, *next = NULL;
SYS_SLIST_FOR_EACH_CONTAINER(&engine_obj_inst_list, obj_inst,
node) {
if (obj_inst->obj->obj_id == obj_id &&
obj_inst->obj_inst_id > obj_inst_id &&
(!next || next->obj_inst_id > obj_inst->obj_inst_id)) {
next = obj_inst;
}
}
return next;
}
int lwm2m_create_obj_inst(u16_t obj_id, u16_t obj_inst_id,
struct lwm2m_engine_obj_inst **obj_inst)
{
struct lwm2m_engine_obj *obj;
int ret;
*obj_inst = NULL;
obj = get_engine_obj(obj_id);
if (!obj) {
LOG_ERR("unable to find obj: %u", obj_id);
return -ENOENT;
}
if (!obj->create_cb) {
LOG_ERR("obj %u has no create_cb", obj_id);
return -EINVAL;
}
if (obj->instance_count + 1 > obj->max_instance_count) {
LOG_ERR("no more instances available for obj %u", obj_id);
return -ENOMEM;
}
*obj_inst = obj->create_cb(obj_inst_id);
if (!*obj_inst) {
LOG_ERR("unable to create obj %u instance %u",
obj_id, obj_inst_id);
/*
* Already checked for instance count total.
* This can only be an error if the object instance exists.
*/
return -EEXIST;
}
obj->instance_count++;
(*obj_inst)->obj = obj;
(*obj_inst)->obj_inst_id = obj_inst_id;
engine_register_obj_inst(*obj_inst);
if (obj->user_create_cb) {
ret = obj->user_create_cb(obj_inst_id);
if (ret < 0) {
LOG_ERR("Error in user obj create %u/%u: %d",
obj_id, obj_inst_id, ret);
lwm2m_delete_obj_inst(obj_id, obj_inst_id);
return ret;
}
}
return 0;
}
int lwm2m_delete_obj_inst(u16_t obj_id, u16_t obj_inst_id)
{
int i, ret = 0;
struct lwm2m_engine_obj *obj;
struct lwm2m_engine_obj_inst *obj_inst;
obj = get_engine_obj(obj_id);
if (!obj) {
return -ENOENT;
}
obj_inst = get_engine_obj_inst(obj_id, obj_inst_id);
if (!obj_inst) {
return -ENOENT;
}
if (obj->user_delete_cb) {
ret = obj->user_delete_cb(obj_inst_id);
if (ret < 0) {
LOG_ERR("Error in user obj delete %u/%u: %d",
obj_id, obj_inst_id, ret);
/* don't return error */
}
}
engine_unregister_obj_inst(obj_inst);
obj->instance_count--;
if (obj->delete_cb) {
ret = obj->delete_cb(obj_inst_id);
}
/* reset obj_inst and res_inst data structure */
for (i = 0; i < obj_inst->resource_count; i++) {
clear_attrs(&obj_inst->resources[i]);
(void)memset(obj_inst->resources + i, 0,
sizeof(struct lwm2m_engine_res_inst));
}
clear_attrs(obj_inst);
(void)memset(obj_inst, 0, sizeof(struct lwm2m_engine_obj_inst));
return ret;
}
/* utility functions */
static int get_option_int(const struct coap_packet *cpkt, u8_t opt)
{
struct coap_option option = {};
u16_t count = 1U;
int r;
r = coap_find_options(cpkt, opt, &option, count);
if (r <= 0) {
return -ENOENT;
}
return coap_option_value_to_int(&option);
}
static u16_t atou16(u8_t *buf, u16_t buflen, u16_t *len)
{
u16_t val = 0U;
u16_t pos = 0U;
/* we should get a value first - consume all numbers */
while (pos < buflen && isdigit(buf[pos])) {
val = val * 10U + (buf[pos] - '0');
pos++;
}
*len = pos;
return val;
}
static int atof32(const char *input, float32_value_t *out)
{
char *pos, *end, buf[24];
long int val;
s32_t base = 1000000, sign = 1;
if (!input || !out) {
return -EINVAL;
}
strncpy(buf, input, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\0';
if (strchr(buf, '-')) {
sign = -1;
}
pos = strchr(buf, '.');
if (pos) {
*pos = '\0';
}
errno = 0;
val = strtol(buf, &end, 10);
if (errno || *end || val < INT_MIN) {
return -EINVAL;
}
out->val1 = (s32_t) val;
out->val2 = 0;
if (!pos) {
return 0;
}
while (*(++pos) && base > 1 && isdigit((unsigned char)*pos)) {
out->val2 = out->val2 * 10 + (*pos - '0');
base /= 10;
}
out->val2 *= sign * base;
return !*pos || base == 1 ? 0 : -EINVAL;
}
static int coap_options_to_path(struct coap_option *opt, int options_count,
struct lwm2m_obj_path *path)
{
u16_t len, *id[4] = { &path->obj_id, &path->obj_inst_id,
&path->res_id, &path->res_inst_id };
path->level = options_count;
for (int i = 0; i < options_count; i++) {
*id[i] = atou16(opt[i].value, opt[i].len, &len);
if (len == 0U || opt[i].len != len) {
path->level = i;
break;
}
}
return options_count == path->level ? 0 : -EINVAL;
}
static struct lwm2m_message *find_msg(struct coap_pending *pending,
struct coap_reply *reply)
{
size_t i;
if (!pending && !reply) {
return NULL;
}
for (i = 0; i < CONFIG_LWM2M_ENGINE_MAX_MESSAGES; i++) {
if (messages[i].ctx && messages[i].pending == pending) {
return &messages[i];
}
if (messages[i].ctx && messages[i].reply == reply) {
return &messages[i];
}
}
return NULL;
}
struct lwm2m_message *lwm2m_get_message(struct lwm2m_ctx *client_ctx)
{
size_t i;
for (i = 0; i < CONFIG_LWM2M_ENGINE_MAX_MESSAGES; i++) {
if (!messages[i].ctx) {
messages[i].ctx = client_ctx;
return &messages[i];
}
}
return NULL;
}
void lwm2m_reset_message(struct lwm2m_message *msg, bool release)
{
if (!msg) {
return;
}
if (msg->pending) {
coap_pending_clear(msg->pending);
}
if (msg->reply) {
/* make sure we want to clear the reply */
coap_reply_clear(msg->reply);
}
if (release) {
(void)memset(msg, 0, sizeof(*msg));
} else {
msg->message_timeout_cb = NULL;
(void)memset(&msg->cpkt, 0, sizeof(msg->cpkt));
}
}
int lwm2m_init_message(struct lwm2m_message *msg)
{
u8_t tokenlen = 0U;
u8_t *token = NULL;
int r = 0;
if (!msg || !msg->ctx) {
LOG_ERR("LwM2M message is invalid.");
return -EINVAL;
}
/*
* msg->tkl == 0 is for a new TOKEN
* msg->tkl == LWM2M_MSG_TOKEN_LEN_SKIP means dont set
*/
if (msg->tkl == 0U) {
tokenlen = 0U;
token = coap_next_token();
} else if (msg->token && msg->tkl != LWM2M_MSG_TOKEN_LEN_SKIP) {
tokenlen = msg->tkl;
token = msg->token;
}
r = coap_packet_init(&msg->cpkt, msg->msg_data, sizeof(msg->msg_data),
1, msg->type, tokenlen, token, msg->code,
(msg->mid > 0 ? msg->mid : coap_next_id()));
if (r < 0) {
LOG_ERR("coap packet init error (err:%d)", r);
goto cleanup;
}
/* only TYPE_CON messages need pending tracking / reply handling */
if (msg->type != COAP_TYPE_CON) {
return 0;
}
msg->pending = coap_pending_next_unused(
msg->ctx->pendings,
CONFIG_LWM2M_ENGINE_MAX_PENDING);
if (!msg->pending) {
LOG_ERR("Unable to find a free pending to track "
"retransmissions.");
r = -ENOMEM;
goto cleanup;
}
r = coap_pending_init(msg->pending, &msg->cpkt, &msg->ctx->remote_addr);
if (r < 0) {
LOG_ERR("Unable to initialize a pending "
"retransmission (err:%d).", r);
goto cleanup;
}
if (msg->reply_cb) {
msg->reply = coap_reply_next_unused(
msg->ctx->replies,
CONFIG_LWM2M_ENGINE_MAX_REPLIES);
if (!msg->reply) {
LOG_ERR("No resources for waiting for replies.");
r = -ENOMEM;
goto cleanup;
}
coap_reply_clear(msg->reply);
coap_reply_init(msg->reply, &msg->cpkt);
msg->reply->reply = msg->reply_cb;
}
return 0;
cleanup:
lwm2m_reset_message(msg, true);
return r;
}
int lwm2m_send_message(struct lwm2m_message *msg)
{
if (!msg || !msg->ctx) {
LOG_ERR("LwM2M message is invalid.");
return -EINVAL;
}
if (msg->type == COAP_TYPE_CON) {
coap_pending_cycle(msg->pending);
}
msg->send_attempts++;
if (send(msg->ctx->sock_fd, msg->cpkt.data, msg->cpkt.offset, 0) < 0) {
if (msg->type == COAP_TYPE_CON) {
coap_pending_clear(msg->pending);
}
return -errno;
}
if (msg->type == COAP_TYPE_CON) {
/* don't re-queue the retransmit work on retransmits */
if (msg->send_attempts > 1) {
return 0;
}
k_delayed_work_submit(&msg->ctx->retransmit_work,
msg->pending->timeout);
} else {
lwm2m_reset_message(msg, true);
}
return 0;
}
u16_t lwm2m_get_rd_data(u8_t *client_data, u16_t size)
{
struct lwm2m_engine_obj *obj;
struct lwm2m_engine_obj_inst *obj_inst;
u8_t temp[32];
u16_t pos = 0U;
int len;
/* Add resource-type/content-type to the registration message */
memcpy(client_data, REG_PREFACE, sizeof(REG_PREFACE) - 1);
pos += sizeof(REG_PREFACE) - 1;
SYS_SLIST_FOR_EACH_CONTAINER(&engine_obj_list, obj, node) {
/* Security obj MUST NOT be part of registration message */
if (obj->obj_id == LWM2M_OBJECT_SECURITY_ID) {
continue;
}
/* Only report <OBJ_ID> when no instance available */
if (obj->instance_count == 0U) {
len = snprintk(temp, sizeof(temp), "%s</%u>",
(pos > 0) ? "," : "", obj->obj_id);
if (pos + len >= size) {
/* full buffer -- exit loop */
break;
}
memcpy(&client_data[pos], temp, len);
pos += len;
continue;
}
SYS_SLIST_FOR_EACH_CONTAINER(&engine_obj_inst_list,
obj_inst, node) {
if (obj_inst->obj->obj_id == obj->obj_id) {
len = snprintk(temp, sizeof(temp),
"%s</%u/%u>",
(pos > 0) ? "," : "",
obj_inst->obj->obj_id,
obj_inst->obj_inst_id);
/*
* TODO: iterate through resources once block
* transfer is handled correctly
*/
if (pos + len >= size) {
/* full buffer -- exit loop */
break;
}
memcpy(&client_data[pos], temp, len);
pos += len;
}
}
}
client_data[pos] = '\0';
return pos;
}
/* input / output selection */
static int select_writer(struct lwm2m_output_context *out, u16_t accept)
{
switch (accept) {
case LWM2M_FORMAT_APP_LINK_FORMAT:
/* TODO: rewrite do_discover as content formatter */
break;
case LWM2M_FORMAT_PLAIN_TEXT:
case LWM2M_FORMAT_OMA_PLAIN_TEXT:
out->writer = &plain_text_writer;
break;
case LWM2M_FORMAT_OMA_TLV:
case LWM2M_FORMAT_OMA_OLD_TLV:
out->writer = &oma_tlv_writer;
break;
#ifdef CONFIG_LWM2M_RW_JSON_SUPPORT
case LWM2M_FORMAT_OMA_JSON:
case LWM2M_FORMAT_OMA_OLD_JSON:
out->writer = &json_writer;
break;
#endif
default:
LOG_WRN("Unknown content type %u", accept);
return -ENOMSG;
}
return 0;
}
static int select_reader(struct lwm2m_input_context *in, u16_t format)
{
switch (format) {
case LWM2M_FORMAT_APP_OCTET_STREAM:
case LWM2M_FORMAT_PLAIN_TEXT:
case LWM2M_FORMAT_OMA_PLAIN_TEXT:
in->reader = &plain_text_reader;
break;
case LWM2M_FORMAT_OMA_TLV:
case LWM2M_FORMAT_OMA_OLD_TLV:
in->reader = &oma_tlv_reader;
break;
#ifdef CONFIG_LWM2M_RW_JSON_SUPPORT
case LWM2M_FORMAT_OMA_JSON:
case LWM2M_FORMAT_OMA_OLD_JSON:
in->reader = &json_reader;
break;
#endif
default:
LOG_WRN("Unknown content type %u", format);
return -ENOMSG;
}
return 0;
}
/* user data setter functions */
static int string_to_path(char *pathstr, struct lwm2m_obj_path *path,
char delim)
{
u16_t value, len;
int i, tokstart = -1, toklen;
int end_index = strlen(pathstr) - 1;
(void)memset(path, 0, sizeof(*path));
for (i = 0; i <= end_index; i++) {
/* search for first numeric */
if (tokstart == -1) {
if (!isdigit((unsigned char)pathstr[i])) {
continue;
}
tokstart = i;
}
/* find delimiter char or end of string */
if (pathstr[i] == delim || i == end_index) {
toklen = i - tokstart + 1;
/* don't process delimiter char */
if (pathstr[i] == delim) {
toklen--;
}
if (toklen <= 0) {
continue;
}
value = atou16(&pathstr[tokstart], toklen, &len);
switch (path->level) {
case 0:
path->obj_id = value;
break;
case 1:
path->obj_inst_id = value;
break;
case 2:
path->res_id = value;
break;
case 3:
path->res_inst_id = value;
break;
default:
LOG_ERR("invalid level (%d)", path->level);
return -EINVAL;
}
/* increase the path level for each token found */
path->level++;
tokstart = -1;
}
}
return 0;
}
static int path_to_objs(const struct lwm2m_obj_path *path,
struct lwm2m_engine_obj_inst **obj_inst,
struct lwm2m_engine_obj_field **obj_field,
struct lwm2m_engine_res_inst **res)
{
struct lwm2m_engine_obj_inst *oi;
struct lwm2m_engine_obj_field *of;
struct lwm2m_engine_res_inst *r = NULL;
int i;
if (!path) {
return -EINVAL;
}
oi = get_engine_obj_inst(path->obj_id, path->obj_inst_id);
if (!oi) {
LOG_ERR("obj instance %d/%d not found",
path->obj_id, path->obj_inst_id);
return -ENOENT;
}
if (!oi->resources || oi->resource_count == 0U) {
LOG_ERR("obj instance has no resources");
return -EINVAL;
}
of = lwm2m_get_engine_obj_field(oi->obj, path->res_id);
if (!of) {
LOG_ERR("obj field %d not found", path->res_id);
return -ENOENT;
}
for (i = 0; i < oi->resource_count; i++) {
if (oi->resources[i].res_id == path->res_id) {
r = &oi->resources[i];
break;
}
}
if (!r) {
LOG_ERR("res instance %d not found", path->res_id);
return -ENOENT;
}
if (obj_inst) {
*obj_inst = oi;
}
if (obj_field) {
*obj_field = of;
}
if (res) {
*res = r;
}
return 0;
}
int lwm2m_engine_create_obj_inst(char *pathstr)
{
struct lwm2m_obj_path path;
struct lwm2m_engine_obj_inst *obj_inst;
int ret = 0;
LOG_DBG("path:%s", pathstr);
/* translate path -> path_obj */
ret = string_to_path(pathstr, &path, '/');
if (ret < 0) {
return ret;
}
if (path.level != 2U) {
LOG_ERR("path must have 2 parts");
return -EINVAL;
}
return lwm2m_create_obj_inst(path.obj_id, path.obj_inst_id, &obj_inst);
}
int lwm2m_engine_set_res_data(char *pathstr, void *data_ptr, u16_t data_len,
u8_t data_flags)
{
struct lwm2m_obj_path path;
struct lwm2m_engine_res_inst *res = NULL;
int ret = 0;
/* translate path -> path_obj */
ret = string_to_path(pathstr, &path, '/');
if (ret < 0) {
return ret;
}
if (path.level < 3) {
LOG_ERR("path must have 3 parts");
return -EINVAL;
}
/* look up resource obj */
ret = path_to_objs(&path, NULL, NULL, &res);
if (ret < 0) {
return ret;
}
/* assign data elements */
res->data_ptr = data_ptr;
res->data_len = data_len;
res->data_flags = data_flags;
return ret;
}
static int lwm2m_engine_set(char *pathstr, void *value, u16_t len)
{
struct lwm2m_obj_path path;
struct lwm2m_engine_obj_inst *obj_inst;
struct lwm2m_engine_obj_field *obj_field;
struct lwm2m_engine_res_inst *res = NULL;
void *data_ptr = NULL;
size_t data_len = 0;
int ret = 0;
bool changed = false;
LOG_DBG("path:%s, value:%p, len:%d", pathstr, value, len);
/* translate path -> path_obj */
ret = string_to_path(pathstr, &path, '/');
if (ret < 0) {
return ret;
}
if (path.level < 3) {
LOG_ERR("path must have 3 parts");
return -EINVAL;
}
/* look up resource obj */
ret = path_to_objs(&path, &obj_inst, &obj_field, &res);
if (ret < 0) {
return ret;
}
if (!res) {
LOG_ERR("res instance %d not found", path.res_id);
return -ENOENT;
}
if (LWM2M_HAS_RES_FLAG(res, LWM2M_RES_DATA_FLAG_RO)) {
LOG_ERR("res data pointer is read-only");
return -EACCES;
}
/* setup initial data elements */
data_ptr = res->data_ptr;
data_len = res->data_len;
/* allow user to override data elements via callback */
if (res->pre_write_cb) {
data_ptr = res->pre_write_cb(obj_inst->obj_inst_id, &data_len);
}
if (!data_ptr) {
LOG_ERR("res data pointer is NULL");
return -EINVAL;
}
/* check length (note: we add 1 to string length for NULL pad) */
if (len > res->data_len -
(obj_field->data_type == LWM2M_RES_TYPE_STRING ? 1 : 0)) {
LOG_ERR("length %u is too long for resource %d data",
len, path.res_id);
return -ENOMEM;
}
if (memcmp(data_ptr, value, len) != 0) {
changed = true;
}
switch (obj_field->data_type) {
case LWM2M_RES_TYPE_OPAQUE:
memcpy((u8_t *)data_ptr, value, len);
break;
case LWM2M_RES_TYPE_STRING:
memcpy((u8_t *)data_ptr, value, len);
((u8_t *)data_ptr)[len] = '\0';
break;
case LWM2M_RES_TYPE_U64:
*((u64_t *)data_ptr) = *(u64_t *)value;
break;
case LWM2M_RES_TYPE_U32:
case LWM2M_RES_TYPE_TIME:
*((u32_t *)data_ptr) = *(u32_t *)value;
break;
case LWM2M_RES_TYPE_U16:
*((u16_t *)data_ptr) = *(u16_t *)value;
break;
case LWM2M_RES_TYPE_U8:
*((u8_t *)data_ptr) = *(u8_t *)value;
break;
case LWM2M_RES_TYPE_S64:
*((s64_t *)data_ptr) = *(s64_t *)value;
break;
case LWM2M_RES_TYPE_S32:
*((s32_t *)data_ptr) = *(s32_t *)value;
break;
case LWM2M_RES_TYPE_S16:
*((s16_t *)data_ptr) = *(s16_t *)value;
break;
case LWM2M_RES_TYPE_S8:
*((s8_t *)data_ptr) = *(s8_t *)value;
break;
case LWM2M_RES_TYPE_BOOL:
*((bool *)data_ptr) = *(bool *)value;
break;
case LWM2M_RES_TYPE_FLOAT32:
((float32_value_t *)data_ptr)->val1 =
((float32_value_t *)value)->val1;
((float32_value_t *)data_ptr)->val2 =
((float32_value_t *)value)->val2;
break;
case LWM2M_RES_TYPE_FLOAT64:
((float64_value_t *)data_ptr)->val1 =
((float64_value_t *)value)->val1;
((float64_value_t *)data_ptr)->val2 =
((float64_value_t *)value)->val2;
break;
default:
LOG_ERR("unknown obj data_type %d", obj_field->data_type);
return -EINVAL;
}
if (res->post_write_cb) {
ret = res->post_write_cb(obj_inst->obj_inst_id, data_ptr, len,
false, 0);
}
if (changed) {
NOTIFY_OBSERVER_PATH(&path);
}
return ret;
}
int lwm2m_engine_set_opaque(char *pathstr, char *data_ptr, u16_t data_len)
{
return lwm2m_engine_set(pathstr, data_ptr, data_len);
}
int lwm2m_engine_set_string(char *pathstr, char *data_ptr)
{
return lwm2m_engine_set(pathstr, data_ptr, strlen(data_ptr));
}
int lwm2m_engine_set_u8(char *pathstr, u8_t value)
{
return lwm2m_engine_set(pathstr, &value, 1);
}
int lwm2m_engine_set_u16(char *pathstr, u16_t value)
{
return lwm2m_engine_set(pathstr, &value, 2);
}
int lwm2m_engine_set_u32(char *pathstr, u32_t value)
{
return lwm2m_engine_set(pathstr, &value, 4);
}
int lwm2m_engine_set_u64(char *pathstr, u64_t value)
{
return lwm2m_engine_set(pathstr, &value, 8);
}
int lwm2m_engine_set_s8(char *pathstr, s8_t value)
{
return lwm2m_engine_set(pathstr, &value, 1);
}
int lwm2m_engine_set_s16(char *pathstr, s16_t value)
{
return lwm2m_engine_set(pathstr, &value, 2);
}
int lwm2m_engine_set_s32(char *pathstr, s32_t value)
{
return lwm2m_engine_set(pathstr, &value, 4);
}
int lwm2m_engine_set_s64(char *pathstr, s64_t value)
{
return lwm2m_engine_set(pathstr, &value, 8);
}
int lwm2m_engine_set_bool(char *pathstr, bool value)
{
u8_t temp = (value != 0 ? 1 : 0);
return lwm2m_engine_set(pathstr, &temp, 1);
}
int lwm2m_engine_set_float32(char *pathstr, float32_value_t *value)
{
return lwm2m_engine_set(pathstr, value, sizeof(float32_value_t));
}
int lwm2m_engine_set_float64(char *pathstr, float64_value_t *value)
{
return lwm2m_engine_set(pathstr, value, sizeof(float64_value_t));
}
/* user data getter functions */
int lwm2m_engine_get_res_data(char *pathstr, void **data_ptr, u16_t *data_len,
u8_t *data_flags)
{
struct lwm2m_obj_path path;
struct lwm2m_engine_res_inst *res = NULL;
int ret = 0;
/* translate path -> path_obj */
ret = string_to_path(pathstr, &path, '/');
if (ret < 0) {
return ret;
}
if (path.level < 3) {
LOG_ERR("path must have 3 parts");
return -EINVAL;
}
/* look up resource obj */
ret = path_to_objs(&path, NULL, NULL, &res);
if (ret < 0) {
return ret;
}
*data_ptr = res->data_ptr;
*data_len = res->data_len;
*data_flags = res->data_flags;
return 0;
}
static int lwm2m_engine_get(char *pathstr, void *buf, u16_t buflen)
{
int ret = 0;
struct lwm2m_obj_path path;
struct lwm2m_engine_obj_inst *obj_inst;
struct lwm2m_engine_obj_field *obj_field;
struct lwm2m_engine_res_inst *res = NULL;
void *data_ptr = NULL;
size_t data_len = 0;
LOG_DBG("path:%s, buf:%p, buflen:%d", pathstr, buf, buflen);
/* translate path -> path_obj */
ret = string_to_path(pathstr, &path, '/');
if (ret < 0) {
return ret;
}
if (path.level < 3) {
LOG_ERR("path must have 3 parts");
return -EINVAL;
}
/* look up resource obj */
ret = path_to_objs(&path, &obj_inst, &obj_field, &res);
if (ret < 0) {
return ret;
}
if (!res) {
LOG_ERR("res instance %d not found", path.res_id);
return -ENOENT;
}
/* setup initial data elements */
data_ptr = res->data_ptr;
data_len = res->data_len;
/* allow user to override data elements via callback */
if (res->read_cb) {
data_ptr = res->read_cb(obj_inst->obj_inst_id, &data_len);
}
/* TODO: handle data_len > buflen case */
if (data_ptr && data_len > 0) {
switch (obj_field->data_type) {
case LWM2M_RES_TYPE_OPAQUE:
if (data_len > buflen) {
return -ENOMEM;
}
memcpy(buf, data_ptr, data_len);
break;
case LWM2M_RES_TYPE_STRING:
strncpy((u8_t *)buf, (u8_t *)data_ptr, buflen);
break;
case LWM2M_RES_TYPE_U64:
*(u64_t *)buf = *(u64_t *)data_ptr;
break;
case LWM2M_RES_TYPE_U32:
case LWM2M_RES_TYPE_TIME:
*(u32_t *)buf = *(u32_t *)data_ptr;
break;
case LWM2M_RES_TYPE_U16:
*(u16_t *)buf = *(u16_t *)data_ptr;
break;
case LWM2M_RES_TYPE_U8:
*(u8_t *)buf = *(u8_t *)data_ptr;
break;
case LWM2M_RES_TYPE_S64:
*(s64_t *)buf = *(s64_t *)data_ptr;
break;
case LWM2M_RES_TYPE_S32:
*(s32_t *)buf = *(s32_t *)data_ptr;
break;
case LWM2M_RES_TYPE_S16:
*(s16_t *)buf = *(s16_t *)data_ptr;
break;
case LWM2M_RES_TYPE_S8:
*(s8_t *)buf = *(s8_t *)data_ptr;
break;
case LWM2M_RES_TYPE_BOOL:
*(bool *)buf = *(bool *)data_ptr;
break;
case LWM2M_RES_TYPE_FLOAT32:
((float32_value_t *)buf)->val1 =
((float32_value_t *)data_ptr)->val1;
((float32_value_t *)buf)->val2 =
((float32_value_t *)data_ptr)->val2;
break;
case LWM2M_RES_TYPE_FLOAT64:
((float64_value_t *)buf)->val1 =
((float64_value_t *)data_ptr)->val1;
((float64_value_t *)buf)->val2 =
((float64_value_t *)data_ptr)->val2;
break;
default:
LOG_ERR("unknown obj data_type %d",
obj_field->data_type);
return -EINVAL;
}
}
return 0;
}
int lwm2m_engine_get_opaque(char *pathstr, void *buf, u16_t buflen)
{
return lwm2m_engine_get(pathstr, buf, buflen);
}
int lwm2m_engine_get_string(char *pathstr, void *buf, u16_t buflen)
{
return lwm2m_engine_get(pathstr, buf, buflen);
}
int lwm2m_engine_get_u8(char *pathstr, u8_t *value)
{
return lwm2m_engine_get(pathstr, value, 1);
}
int lwm2m_engine_get_u16(char *pathstr, u16_t *value)
{
return lwm2m_engine_get(pathstr, value, 2);
}
int lwm2m_engine_get_u32(char *pathstr, u32_t *value)
{
return lwm2m_engine_get(pathstr, value, 4);
}
int lwm2m_engine_get_u64(char *pathstr, u64_t *value)
{
return lwm2m_engine_get(pathstr, value, 8);
}
int lwm2m_engine_get_s8(char *pathstr, s8_t *value)
{
return lwm2m_engine_get(pathstr, value, 1);
}
int lwm2m_engine_get_s16(char *pathstr, s16_t *value)
{
return lwm2m_engine_get(pathstr, value, 2);
}
int lwm2m_engine_get_s32(char *pathstr, s32_t *value)
{
return lwm2m_engine_get(pathstr, value, 4);
}
int lwm2m_engine_get_s64(char *pathstr, s64_t *value)
{
return lwm2m_engine_get(pathstr, value, 8);
}
int lwm2m_engine_get_bool(char *pathstr, bool *value)
{
int ret = 0;
s8_t temp = 0;
ret = lwm2m_engine_get_s8(pathstr, &temp);
if (!ret) {
*value = temp != 0;
}
return ret;
}
int lwm2m_engine_get_float32(char *pathstr, float32_value_t *buf)
{
return lwm2m_engine_get(pathstr, buf, sizeof(float32_value_t));
}
int lwm2m_engine_get_float64(char *pathstr, float64_value_t *buf)
{
return lwm2m_engine_get(pathstr, buf, sizeof(float64_value_t));
}
int lwm2m_engine_get_resource(char *pathstr, struct lwm2m_engine_res_inst **res)
{
int ret;
struct lwm2m_obj_path path;
ret = string_to_path(pathstr, &path, '/');
if (ret < 0) {
return ret;
}
if (path.level < 3) {
LOG_ERR("path must have 3 parts");
return -EINVAL;
}
return path_to_objs(&path, NULL, NULL, res);
}
int lwm2m_engine_register_read_callback(char *pathstr,
lwm2m_engine_get_data_cb_t cb)
{
int ret;
struct lwm2m_engine_res_inst *res = NULL;
ret = lwm2m_engine_get_resource(pathstr, &res);
if (ret < 0) {
return ret;
}
res->read_cb = cb;
return 0;
}
int lwm2m_engine_register_pre_write_callback(char *pathstr,
lwm2m_engine_get_data_cb_t cb)
{
int ret;
struct lwm2m_engine_res_inst *res = NULL;
ret = lwm2m_engine_get_resource(pathstr, &res);
if (ret < 0) {
return ret;
}
res->pre_write_cb = cb;
return 0;
}
int lwm2m_engine_register_post_write_callback(char *pathstr,
lwm2m_engine_set_data_cb_t cb)
{
int ret;
struct lwm2m_engine_res_inst *res = NULL;
ret = lwm2m_engine_get_resource(pathstr, &res);
if (ret < 0) {
return ret;
}
res->post_write_cb = cb;
return 0;
}
int lwm2m_engine_register_exec_callback(char *pathstr,
lwm2m_engine_user_cb_t cb)
{
int ret;
struct lwm2m_engine_res_inst *res = NULL;
ret = lwm2m_engine_get_resource(pathstr, &res);
if (ret < 0) {
return ret;
}
res->execute_cb = cb;
return 0;
}
int lwm2m_engine_register_create_callback(u16_t obj_id,
lwm2m_engine_user_cb_t cb)
{
struct lwm2m_engine_obj *obj = NULL;
obj = get_engine_obj(obj_id);
if (!obj) {
LOG_ERR("unable to find obj: %u", obj_id);
return -ENOENT;
}
obj->user_create_cb = cb;
return 0;
}
int lwm2m_engine_register_delete_callback(u16_t obj_id,
lwm2m_engine_user_cb_t cb)
{
struct lwm2m_engine_obj *obj = NULL;
obj = get_engine_obj(obj_id);
if (!obj) {
LOG_ERR("unable to find obj: %u", obj_id);
return -ENOENT;
}
obj->user_delete_cb = cb;
return 0;
}
/* generic data handlers */
static int lwm2m_read_handler(struct lwm2m_engine_obj_inst *obj_inst,
struct lwm2m_engine_res_inst *res,
struct lwm2m_engine_obj_field *obj_field,
struct lwm2m_message *msg)
{
int i, loop_max = 1;
u16_t res_inst_id_tmp = 0U;
void *data_ptr = NULL;
size_t data_len = 0;
if (!obj_inst || !res || !obj_field || !msg) {
return -EINVAL;
}
/* setup initial data elements */
data_ptr = res->data_ptr;
data_len = res->data_len;
/* allow user to override data elements via callback */
if (res->read_cb) {
data_ptr = res->read_cb(obj_inst->obj_inst_id, &data_len);
}
if (!data_ptr || data_len == 0) {
return -ENOENT;
}
if (res->multi_count_var != NULL) {
/* if multi_count_var is 0 (none assigned) return NOT_FOUND */
if (*res->multi_count_var == 0U) {
return -ENOENT;
}
engine_put_begin_ri(&msg->out, &msg->path);
loop_max = *res->multi_count_var;
res_inst_id_tmp = msg->path.res_inst_id;
}
for (i = 0; i < loop_max; i++) {
if (res->multi_count_var != NULL) {
msg->path.res_inst_id = (u16_t) i;
}
switch (obj_field->data_type) {
/* do nothing for OPAQUE (probably has a callback) */
case LWM2M_RES_TYPE_OPAQUE:
break;
/* TODO: handle multi count for string? */
case LWM2M_RES_TYPE_STRING:
engine_put_string(&msg->out, &msg->path,
(u8_t *)data_ptr,
strlen((u8_t *)data_ptr));
break;
case LWM2M_RES_TYPE_U64:
engine_put_s64(&msg->out, &msg->path,
(s64_t)((u64_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_U32:
case LWM2M_RES_TYPE_TIME:
engine_put_s32(&msg->out, &msg->path,
(s32_t)((u32_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_U16:
engine_put_s16(&msg->out, &msg->path,
(s16_t)((u16_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_U8:
engine_put_s8(&msg->out, &msg->path,
(s8_t)((u8_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_S64:
engine_put_s64(&msg->out, &msg->path,
((s64_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_S32:
engine_put_s32(&msg->out, &msg->path,
((s32_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_S16:
engine_put_s16(&msg->out, &msg->path,
((s16_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_S8:
engine_put_s8(&msg->out, &msg->path,
((s8_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_BOOL:
engine_put_bool(&msg->out, &msg->path,
((bool *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_FLOAT32:
engine_put_float32fix(&msg->out, &msg->path,
&((float32_value_t *)data_ptr)[i]);
break;
case LWM2M_RES_TYPE_FLOAT64:
engine_put_float64fix(&msg->out, &msg->path,
&((float64_value_t *)data_ptr)[i]);
break;
default:
LOG_ERR("unknown obj data_type %d",
obj_field->data_type);
return -EINVAL;
}
}
if (res->multi_count_var != NULL) {
engine_put_end_ri(&msg->out, &msg->path);
msg->path.res_inst_id = res_inst_id_tmp;
}
return 0;
}
size_t lwm2m_engine_get_opaque_more(struct lwm2m_input_context *in,
u8_t *buf, size_t buflen, bool *last_block)
{
u16_t in_len = in->opaque_len;
if (in_len > buflen) {
in_len = buflen;
}
in->opaque_len -= in_len;
if (in->opaque_len == 0U) {
*last_block = true;
}
if (buf_read(buf, in_len, CPKT_BUF_READ(in->in_cpkt),
&in->offset) < 0) {
*last_block = true;
return 0;
}
return (size_t)in_len;
}
static int lwm2m_write_handler_opaque(struct lwm2m_engine_obj_inst *obj_inst,
struct lwm2m_engine_res_inst *res,
struct lwm2m_input_context *in,
void *data_ptr, size_t data_len,
bool last_block, size_t total_size)
{
size_t len = 1;
bool last_pkt_block = false, first_read = true;
int ret = 0;
while (!last_pkt_block && len > 0) {
if (first_read) {
len = engine_get_opaque(in, (u8_t *)data_ptr,
data_len, &last_pkt_block);
if (len == 0) {
/* ignore empty content and continue */
return 0;
}
first_read = false;
} else {
len = lwm2m_engine_get_opaque_more(in, (u8_t *)data_ptr,
data_len,
&last_pkt_block);
}
if (len == 0) {
return -EINVAL;
}
if (res->post_write_cb) {
ret = res->post_write_cb(obj_inst->obj_inst_id,
data_ptr, len,
last_pkt_block && last_block,
total_size);
if (ret < 0) {
return ret;
}
}
}
return ret;
}
/* This function is exposed for the content format writers */
int lwm2m_write_handler(struct lwm2m_engine_obj_inst *obj_inst,
struct lwm2m_engine_res_inst *res,
struct lwm2m_engine_obj_field *obj_field,
struct lwm2m_message *msg)
{
struct block_context *block_ctx = NULL;
void *data_ptr = NULL;
size_t data_len = 0;
size_t len = 0;
size_t total_size = 0;
s64_t temp64 = 0;
s32_t temp32 = 0;
int ret = 0;
u8_t token[8];
u8_t tkl = 0U;
bool last_block = true;
if (!obj_inst || !res || !obj_field || !msg) {
return -EINVAL;
}
if (LWM2M_HAS_RES_FLAG(res, LWM2M_RES_DATA_FLAG_RO)) {
return -EACCES;
}
/* setup initial data elements */
data_ptr = res->data_ptr;
data_len = res->data_len;
/* allow user to override data elements via callback */
if (res->pre_write_cb) {
data_ptr = res->pre_write_cb(obj_inst->obj_inst_id, &data_len);
}
if (res->post_write_cb) {
/* Get block1 option for checking MORE block flag */
ret = get_option_int(msg->in.in_cpkt, COAP_OPTION_BLOCK1);
if (ret >= 0) {
last_block = !GET_MORE(ret);
/* Get block_ctx for total_size (might be zero) */
tkl = coap_header_get_token(msg->in.in_cpkt, token);
if (tkl && !get_block_ctx(token, tkl, &block_ctx)) {
total_size = block_ctx->ctx.total_size;
LOG_DBG("BLOCK1: total:%zu current:%zu"
" last:%u",
block_ctx->ctx.total_size,
block_ctx->ctx.current,
last_block);
}
}
}
if (data_ptr && data_len > 0) {
switch (obj_field->data_type) {
case LWM2M_RES_TYPE_OPAQUE:
ret = lwm2m_write_handler_opaque(obj_inst, res,
&msg->in,
data_ptr, data_len,
last_block,
total_size);
if (ret < 0) {
return ret;
}
break;
case LWM2M_RES_TYPE_STRING:
engine_get_string(&msg->in, (u8_t *)data_ptr, data_len);
len = strlen((char *)data_ptr);
break;
case LWM2M_RES_TYPE_U64:
engine_get_s64(&msg->in, &temp64);
*(u64_t *)data_ptr = temp64;
len = 8;
break;
case LWM2M_RES_TYPE_U32:
case LWM2M_RES_TYPE_TIME:
engine_get_s32(&msg->in, &temp32);
*(u32_t *)data_ptr = temp32;
len = 4;
break;
case LWM2M_RES_TYPE_U16:
engine_get_s32(&msg->in, &temp32);
*(u16_t *)data_ptr = temp32;
len = 2;
break;
case LWM2M_RES_TYPE_U8:
engine_get_s32(&msg->in, &temp32);
*(u8_t *)data_ptr = temp32;
len = 1;
break;
case LWM2M_RES_TYPE_S64:
engine_get_s64(&msg->in, (s64_t *)data_ptr);
len = 8;
break;
case LWM2M_RES_TYPE_S32:
engine_get_s32(&msg->in, (s32_t *)data_ptr);
len = 4;
break;
case LWM2M_RES_TYPE_S16:
engine_get_s32(&msg->in, &temp32);
*(s16_t *)data_ptr = temp32;
len = 2;
break;
case LWM2M_RES_TYPE_S8:
engine_get_s32(&msg->in, &temp32);
*(s8_t *)data_ptr = temp32;
len = 1;
break;
case LWM2M_RES_TYPE_BOOL:
engine_get_bool(&msg->in, (bool *)data_ptr);
len = 1;
break;
case LWM2M_RES_TYPE_FLOAT32:
engine_get_float32fix(&msg->in,
(float32_value_t *)data_ptr);
len = sizeof(float32_value_t);
break;
case LWM2M_RES_TYPE_FLOAT64:
engine_get_float64fix(&msg->in,
(float64_value_t *)data_ptr);
len = sizeof(float64_value_t);
break;
default:
LOG_ERR("unknown obj data_type %d",
obj_field->data_type);
return -EINVAL;
}
} else {
return -ENOENT;
}
if (res->post_write_cb &&
obj_field->data_type != LWM2M_RES_TYPE_OPAQUE) {
ret = res->post_write_cb(obj_inst->obj_inst_id, data_ptr, len,
last_block, total_size);
}
NOTIFY_OBSERVER_PATH(&msg->path);
return ret;
}
static int lwm2m_write_attr_handler(struct lwm2m_engine_obj *obj,
struct lwm2m_message *msg)
{
bool update_observe_node = false;
char opt_buf[COAP_OPTION_BUF_LEN];
int nr_opt, i, ret = 0;
struct coap_option options[NR_LWM2M_ATTR];
struct lwm2m_engine_obj_inst *obj_inst = NULL;
struct lwm2m_engine_res_inst *res = NULL;
struct lwm2m_attr *attr;
struct notification_attrs nattrs = { 0 };
struct observe_node *obs;
u8_t type = 0U;
void *nattr_ptrs[NR_LWM2M_ATTR] = {
&nattrs.pmin, &nattrs.pmax, &nattrs.gt, &nattrs.lt, &nattrs.st
};
void *ref;
if (!obj || !msg) {
return -EINVAL;
}
/* do not expose security obj */
if (obj->obj_id == LWM2M_OBJECT_SECURITY_ID) {
return -ENOENT;
}
nr_opt = coap_find_options(msg->in.in_cpkt, COAP_OPTION_URI_QUERY,
options, NR_LWM2M_ATTR);
if (nr_opt <= 0) {
LOG_ERR("No attribute found!");
/* translate as bad request */
return -EEXIST;
}
/* get lwm2m_attr slist */
if (msg->path.level == 3U) {
ret = path_to_objs(&msg->path, NULL, NULL, &res);
if (ret < 0) {
return ret;
}
ref = res;
} else if (msg->path.level == 1U) {
ref = obj;
} else if (msg->path.level == 2U) {
obj_inst = get_engine_obj_inst(msg->path.obj_id,
msg->path.obj_inst_id);
if (!obj_inst) {
return -ENOENT;
}
ref = obj_inst;
} else {
/* bad request */
return -EEXIST;
}
/* retrieve existing attributes */
ret = update_attrs(ref, &nattrs);
if (ret < 0) {
return ret;
}
/* loop through options to parse attribute */
for (i = 0; i < nr_opt; i++) {
int limit = MIN(options[i].len, 5), plen = 0, vlen;
float32_value_t val = { 0 };
type = 0U;
/* search for '=' */
while (plen < limit && options[i].value[plen] != '=') {
plen += 1;
}
/* either length = 2(gt/lt/st) or = 4(pmin/pmax) */
if (plen != 2 && plen != 4) {
continue;
}
/* matching attribute name */
for (type = 0U; type < NR_LWM2M_ATTR; type++) {
if (LWM2M_ATTR_LEN[type] == plen &&
!memcmp(options[i].value, LWM2M_ATTR_STR[type],
LWM2M_ATTR_LEN[type])) {
break;
}
}
/* unrecognized attribute */
if (type == NR_LWM2M_ATTR) {
continue;
}
/* unset attribute when no value's given */
if (options[i].len == plen) {
nattrs.flags &= ~BIT(type);
(void)memset(nattr_ptrs[type], 0,
type <= LWM2M_ATTR_PMAX ? sizeof(s32_t) :
sizeof(float32_value_t));
continue;
}
/* gt/lt/st cannot be assigned to obj/obj_inst unless unset */
if (plen == 2 && msg->path.level <= 2U) {
return -EEXIST;
}
vlen = options[i].len - plen - 1;
memcpy(opt_buf, options[i].value + plen + 1, vlen);
opt_buf[vlen] = '\0';
/* convert value to integer or float */
if (plen == 4) {
char *end;
long int v;
/* pmin/pmax: integer (sec 5.1.2)
* however, negative is non-sense
*/
errno = 0;
v = strtol(opt_buf, &end, 10);
if (errno || *end || v < 0) {
ret = -EINVAL;
}
val.val1 = v;
} else {
/* gt/lt/st: type float */
ret = atof32(opt_buf, &val);
}
if (ret < 0) {
LOG_ERR("invalid attr[%s] value",
LWM2M_ATTR_STR[type]);
/* bad request */
return -EEXIST;
}
if (type <= LWM2M_ATTR_PMAX) {
*(s32_t *)nattr_ptrs[type] = val.val1;
} else {
memcpy(nattr_ptrs[type], &val, sizeof(float32_value_t));
}
nattrs.flags |= BIT(type);
}
if ((nattrs.flags & (BIT(LWM2M_ATTR_PMIN) | BIT(LWM2M_ATTR_PMAX))) &&
nattrs.pmin > nattrs.pmax) {
LOG_DBG("pmin (%d) > pmax (%d)", nattrs.pmin, nattrs.pmax);
return -EEXIST;
}
if (nattrs.flags & (BIT(LWM2M_ATTR_LT) | BIT(LWM2M_ATTR_GT))) {
if (!((nattrs.lt.val1 < nattrs.gt.val1) ||
(nattrs.lt.val2 < nattrs.gt.val2))) {
LOG_DBG