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sdk-ameba-v4.0c_180328/component/common/network/coap/sn_coap_builder.c

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first add sdk
2019-04-02 08:34:25 +00:00
/*
* Copyright (c) 2011-2015 ARM Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* \file sn_coap_builder.c
*
* \brief CoAP Message builder
*
* Functionality: Builds CoAP message
*
*/
/* * * * * * * * * * * * * * */
/* * * * INCLUDE FILES * * * */
/* * * * * * * * * * * * * * */
#include <string.h> /* For memset() and memcpy() */
#include "ns_types.h"
#include "sn_coap_header.h"
#include "sn_coap_header_internal.h"
#include "sn_coap_protocol_internal.h"
//#include "mbed_trace.h"
#define TRACE_GROUP "coap"
/* * * * LOCAL FUNCTION PROTOTYPES * * * */
static int8_t sn_coap_builder_header_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr);
static int8_t sn_coap_builder_options_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr);
static uint16_t sn_coap_builder_options_calc_option_size(uint16_t query_len, uint8_t *query_ptr, sn_coap_option_numbers_e option);
static int16_t sn_coap_builder_options_build_add_one_option(uint8_t **dst_packet_data_pptr, uint16_t option_len, uint8_t *option_ptr, sn_coap_option_numbers_e option_number, uint16_t *previous_option_number);
static int16_t sn_coap_builder_options_build_add_multiple_option(uint8_t **dst_packet_data_pptr, uint8_t **src_pptr, uint16_t *src_len_ptr, sn_coap_option_numbers_e option, uint16_t *previous_option_number);
static uint8_t sn_coap_builder_options_build_add_uint_option(uint8_t **dst_packet_data_pptr, uint32_t value, sn_coap_option_numbers_e option_number, uint16_t *previous_option_number);
static uint8_t sn_coap_builder_options_get_option_part_count(uint16_t query_len, uint8_t *query_ptr, sn_coap_option_numbers_e option);
static uint16_t sn_coap_builder_options_get_option_part_length_from_whole_option_string(uint16_t query_len, uint8_t *query_ptr, uint8_t query_index, sn_coap_option_numbers_e option);
static int16_t sn_coap_builder_options_get_option_part_position(uint16_t query_len, uint8_t *query_ptr, uint8_t query_index, sn_coap_option_numbers_e option);
static void sn_coap_builder_payload_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr);
static uint8_t sn_coap_builder_options_calculate_jump_need(sn_coap_hdr_s *src_coap_msg_ptr/*, uint8_t block_option*/);
sn_coap_hdr_s *sn_coap_build_response(struct coap_s *handle, sn_coap_hdr_s *coap_packet_ptr, uint8_t msg_code)
{
sn_coap_hdr_s *coap_res_ptr;
if (!coap_packet_ptr || !handle) {
return NULL;
}
coap_res_ptr = sn_coap_parser_alloc_message(handle);
if (!coap_res_ptr) {
return NULL;
}
if (coap_packet_ptr->msg_type == COAP_MSG_TYPE_CONFIRMABLE) {
coap_res_ptr->msg_type = COAP_MSG_TYPE_ACKNOWLEDGEMENT;
coap_res_ptr->msg_code = (sn_coap_msg_code_e)msg_code;
coap_res_ptr->msg_id = coap_packet_ptr->msg_id;
}
else if (coap_packet_ptr->msg_type == COAP_MSG_TYPE_NON_CONFIRMABLE) {
coap_res_ptr->msg_type = COAP_MSG_TYPE_NON_CONFIRMABLE;
coap_res_ptr->msg_code = (sn_coap_msg_code_e)msg_code;
/* msg_id needs to be set by the caller in this case */
}
else {
handle->sn_coap_protocol_free( coap_res_ptr );
return NULL;
}
if (coap_packet_ptr->token_ptr) {
coap_res_ptr->token_len = coap_packet_ptr->token_len;
coap_res_ptr->token_ptr = handle->sn_coap_protocol_malloc(coap_res_ptr->token_len);
if (!coap_res_ptr->token_ptr) {
handle->sn_coap_protocol_free(coap_res_ptr);
return NULL;
}
memcpy(coap_res_ptr->token_ptr, coap_packet_ptr->token_ptr, coap_res_ptr->token_len);
}
return coap_res_ptr;
}
int16_t sn_coap_builder(uint8_t *dst_packet_data_ptr, sn_coap_hdr_s *src_coap_msg_ptr)
{
return sn_coap_builder_2(dst_packet_data_ptr, src_coap_msg_ptr, SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE);
}
int16_t sn_coap_builder_2(uint8_t *dst_packet_data_ptr, sn_coap_hdr_s *src_coap_msg_ptr, uint16_t blockwise_payload_size)
{
tr_debug("sn_coap_builder_2");
uint8_t *base_packet_data_ptr = NULL;
/* * * * Check given pointers * * * */
if (dst_packet_data_ptr == NULL || src_coap_msg_ptr == NULL) {
return -2;
}
/* Initialize given Packet data memory area with zero values */
uint16_t dst_byte_count_to_be_built = sn_coap_builder_calc_needed_packet_data_size_2(src_coap_msg_ptr, blockwise_payload_size);
tr_debug("sn_coap_builder_2 - message len: [%d]", dst_byte_count_to_be_built);
if (!dst_byte_count_to_be_built) {
return -1;
}
memset(dst_packet_data_ptr, 0, dst_byte_count_to_be_built);
/* * * * Store base (= original) destination Packet data pointer for later usage * * * */
base_packet_data_ptr = dst_packet_data_ptr;
/* * * * * * * * * * * * * * * * * * */
/* * * * Header part building * * * */
/* * * * * * * * * * * * * * * * * * */
if (sn_coap_builder_header_build(&dst_packet_data_ptr, src_coap_msg_ptr) != 0) {
/* Header building failed */
return -1;
}
/* If else than Reset message because Reset message must be empty */
if (src_coap_msg_ptr->msg_type != COAP_MSG_TYPE_RESET) {
/* * * * * * * * * * * * * * * * * * */
/* * * * Options part building * * * */
/* * * * * * * * * * * * * * * * * * */
sn_coap_builder_options_build(&dst_packet_data_ptr, src_coap_msg_ptr);
/* * * * * * * * * * * * * * * * * * */
/* * * * Payload part building * * * */
/* * * * * * * * * * * * * * * * * * */
sn_coap_builder_payload_build(&dst_packet_data_ptr, src_coap_msg_ptr);
}
/* * * * Return built Packet data length * * * */
return (dst_packet_data_ptr - base_packet_data_ptr);
}
uint16_t sn_coap_builder_calc_needed_packet_data_size(sn_coap_hdr_s *src_coap_msg_ptr)
{
return sn_coap_builder_calc_needed_packet_data_size_2(src_coap_msg_ptr, SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE);
}
uint16_t sn_coap_builder_calc_needed_packet_data_size_2(sn_coap_hdr_s *src_coap_msg_ptr, uint16_t blockwise_payload_size)
{
(void)blockwise_payload_size;
tr_debug("sn_coap_builder_calc_needed_packet_data_size_2");
uint16_t returned_byte_count = 0;
if (!src_coap_msg_ptr) {
return 0;
}
/* * * * * HEADER * * * * */
/* Header size is fixed */
returned_byte_count = COAP_HEADER_LENGTH;
/* * * * * OPTIONS * * * * */
/* If else than Reset message because Reset message must be empty */
if (src_coap_msg_ptr->msg_type != COAP_MSG_TYPE_RESET) {
uint16_t repeatable_option_size = 0;
/* TOKEN - Length is 1-8 bytes */
if (src_coap_msg_ptr->token_ptr != NULL) {
if (src_coap_msg_ptr->token_len > 8 || src_coap_msg_ptr->token_len < 1) { /* Check that option is not longer than defined */
return 0;
}
returned_byte_count += src_coap_msg_ptr->token_len;
}
/* URI PATH - Repeatable option. Length of one option is 0-255 */
if (src_coap_msg_ptr->uri_path_ptr != NULL) {
repeatable_option_size = sn_coap_builder_options_calc_option_size(src_coap_msg_ptr->uri_path_len,
src_coap_msg_ptr->uri_path_ptr, COAP_OPTION_URI_PATH);
if (repeatable_option_size) {
returned_byte_count += repeatable_option_size;
} else {
return 0;
}
}
uint16_t tempInt = 0;
/* CONTENT FORMAT - An integer option, up to 2 bytes */
if (src_coap_msg_ptr->content_format != COAP_CT_NONE) {
if ((uint32_t) src_coap_msg_ptr->content_format > 0xffff) {
return 0;
}
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->content_format, COAP_OPTION_CONTENT_FORMAT, &tempInt);
}
/* If options list pointer exists */
if (src_coap_msg_ptr->options_list_ptr != NULL) {
/* ACCEPT - An integer option, up to 2 bytes */
if (src_coap_msg_ptr->options_list_ptr->accept != COAP_CT_NONE) {
if ((uint32_t) src_coap_msg_ptr->options_list_ptr->accept > 0xffff) {
return 0;
}
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->accept, COAP_OPTION_ACCEPT, &tempInt);
}
/* MAX AGE - An integer option, omitted for default. Up to 4 bytes */
if (src_coap_msg_ptr->options_list_ptr->max_age != COAP_OPTION_MAX_AGE_DEFAULT) {
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->max_age, COAP_OPTION_MAX_AGE, &tempInt);
}
/* PROXY URI - Length of this option is 1-1034 bytes */
if (src_coap_msg_ptr->options_list_ptr->proxy_uri_ptr != NULL) {
if (src_coap_msg_ptr->options_list_ptr->proxy_uri_len >= 1 && src_coap_msg_ptr->options_list_ptr->proxy_uri_len <= 12) { /* Add option header byte(s) - depending of option length */
returned_byte_count++;
}
else if (src_coap_msg_ptr->options_list_ptr->proxy_uri_len >= 13 && src_coap_msg_ptr->options_list_ptr->proxy_uri_len <= 269) {
returned_byte_count += 2;
}
else if (src_coap_msg_ptr->options_list_ptr->proxy_uri_len >= 270 && src_coap_msg_ptr->options_list_ptr->proxy_uri_len <= 1034) {
returned_byte_count += 3;
}
else {
return 0;
}
/* Add needed memory for Option value */
returned_byte_count += src_coap_msg_ptr->options_list_ptr->proxy_uri_len;
}
/* ETAG - Repeatable option. Length of this option is 1-8 bytes*/
if (src_coap_msg_ptr->options_list_ptr->etag_ptr != NULL) {
repeatable_option_size = sn_coap_builder_options_calc_option_size(src_coap_msg_ptr->options_list_ptr->etag_len,
src_coap_msg_ptr->options_list_ptr->etag_ptr, COAP_OPTION_ETAG);
if (repeatable_option_size) {
returned_byte_count += repeatable_option_size;
} else {
return 0;
}
}
/* URI HOST - Length of this option is 1-255 bytes */
if (src_coap_msg_ptr->options_list_ptr->uri_host_ptr != NULL) {
if (src_coap_msg_ptr->options_list_ptr->uri_host_len > 0 && src_coap_msg_ptr->options_list_ptr->uri_host_len <= 12) {
returned_byte_count++;
}
else if (src_coap_msg_ptr->options_list_ptr->uri_host_len >= 13 && src_coap_msg_ptr->options_list_ptr->uri_host_len <= 255) {
returned_byte_count += 2;
}
else {
return 0;
}
returned_byte_count += src_coap_msg_ptr->options_list_ptr->uri_host_len;
}
/* LOCATION PATH - Repeatable option. Length of this option is 0-255 bytes*/
if (src_coap_msg_ptr->options_list_ptr->location_path_ptr != NULL) {
repeatable_option_size = sn_coap_builder_options_calc_option_size(src_coap_msg_ptr->options_list_ptr->location_path_len,
src_coap_msg_ptr->options_list_ptr->location_path_ptr, COAP_OPTION_LOCATION_PATH);
if (repeatable_option_size) {
returned_byte_count += repeatable_option_size;
} else {
return 0;
}
}
/* URI PORT - An integer option, up to 2 bytes */
if (src_coap_msg_ptr->options_list_ptr->uri_port != COAP_OPTION_URI_PORT_NONE) {
if ((uint32_t) src_coap_msg_ptr->options_list_ptr->uri_port > 0xffff) {
return 0;
}
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->uri_port, COAP_OPTION_URI_PORT, &tempInt);
}
/* lOCATION QUERY - Repeatable option. Length of this option is 0-255 bytes */
if (src_coap_msg_ptr->options_list_ptr->location_query_ptr != NULL) {
repeatable_option_size = sn_coap_builder_options_calc_option_size(src_coap_msg_ptr->options_list_ptr->location_query_len,
src_coap_msg_ptr->options_list_ptr->location_query_ptr, COAP_OPTION_LOCATION_QUERY);
if (repeatable_option_size) {
returned_byte_count += repeatable_option_size;
} else {
return 0;
}
}
/* OBSERVE - An integer option, up to 3 bytes */
if (src_coap_msg_ptr->options_list_ptr->observe != COAP_OBSERVE_NONE) {
if ((uint32_t) src_coap_msg_ptr->options_list_ptr->observe > 0xffffff) {
return 0;
}
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->observe, COAP_OPTION_OBSERVE, &tempInt);
}
/* URI QUERY - Repeatable option. Length of this option is 1-255 */
if (src_coap_msg_ptr->options_list_ptr->uri_query_ptr != NULL) {
repeatable_option_size = sn_coap_builder_options_calc_option_size(src_coap_msg_ptr->options_list_ptr->uri_query_len,
src_coap_msg_ptr->options_list_ptr->uri_query_ptr, COAP_OPTION_URI_QUERY);
if (repeatable_option_size) {
returned_byte_count += repeatable_option_size;
} else {
return 0;
}
}
/* BLOCK 1 - An integer option, up to 3 bytes */
if (src_coap_msg_ptr->options_list_ptr->block1 != COAP_OPTION_BLOCK_NONE) {
if ((uint32_t) src_coap_msg_ptr->options_list_ptr->block1 > 0xffffff) {
return 0;
}
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->block1, COAP_OPTION_BLOCK1, &tempInt);
}
/* SIZE1 - Length of this option is 0-4 bytes */
if (src_coap_msg_ptr->options_list_ptr->use_size1) {
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->size1, COAP_OPTION_SIZE1, &tempInt);
}
/* BLOCK 2 - An integer option, up to 3 bytes */
if (src_coap_msg_ptr->options_list_ptr->block2 != COAP_OPTION_BLOCK_NONE) {
if ((uint32_t) src_coap_msg_ptr->options_list_ptr->block2 > 0xffffff) {
return 0;
}
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->block2, COAP_OPTION_BLOCK2, &tempInt);
}
/* SIZE2 - Length of this option is 0-4 bytes */
if (src_coap_msg_ptr->options_list_ptr->use_size2) {
returned_byte_count += sn_coap_builder_options_build_add_uint_option(NULL, src_coap_msg_ptr->options_list_ptr->size2, COAP_OPTION_SIZE2, &tempInt);
}
}
#if SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE
if ((src_coap_msg_ptr->payload_len > blockwise_payload_size) && (blockwise_payload_size > 0)) {
returned_byte_count += blockwise_payload_size;
} else {
returned_byte_count += src_coap_msg_ptr->payload_len;
}
#else
returned_byte_count += src_coap_msg_ptr->payload_len;
#endif
if (src_coap_msg_ptr->payload_len) {
returned_byte_count ++; /* For payload marker */
}
returned_byte_count += sn_coap_builder_options_calculate_jump_need(src_coap_msg_ptr/*, 0*/);
}
return returned_byte_count;
}
/**
* \fn static uint8_t sn_coap_builder_options_calculate_jump_need(sn_coap_hdr_s *src_coap_msg_ptr, uint8_t block_option)
*
* \brief Checks if there is need for option jump
*
* \param *src_coap_msg_ptr is source of checked CoAP message
*
* \param block option marks if block option is to be added to message later. 0 = no block option, 1 = block1 and 2 = block2
*
* \return Returns bytes needed for jumping
*/
static uint8_t sn_coap_builder_options_calculate_jump_need(sn_coap_hdr_s *src_coap_msg_ptr/*, uint8_t block_option*/)
{
uint8_t previous_option_number = 0;
uint8_t needed_space = 0;
if (src_coap_msg_ptr->options_list_ptr != NULL) {
/* If option numbers greater than 12 is not used, then jumping is not needed */
//TODO: Check if this is really needed! Does it enhance perf? If not -> remove
if (!src_coap_msg_ptr->options_list_ptr->uri_query_ptr &&
src_coap_msg_ptr->options_list_ptr->accept == COAP_CT_NONE &&
!src_coap_msg_ptr->options_list_ptr->location_query_ptr &&
src_coap_msg_ptr->options_list_ptr->block2 == COAP_OPTION_BLOCK_NONE &&
src_coap_msg_ptr->options_list_ptr->block1 == COAP_OPTION_BLOCK_NONE &&
!src_coap_msg_ptr->options_list_ptr->proxy_uri_ptr &&
src_coap_msg_ptr->options_list_ptr->max_age == COAP_OPTION_MAX_AGE_DEFAULT &&
!src_coap_msg_ptr->options_list_ptr->use_size1 &&
!src_coap_msg_ptr->options_list_ptr->use_size2) {
return 0;
}
if (src_coap_msg_ptr->options_list_ptr->uri_host_ptr != NULL) {
previous_option_number = (COAP_OPTION_URI_HOST);
}
if (src_coap_msg_ptr->options_list_ptr->etag_ptr != NULL) {
previous_option_number = (COAP_OPTION_ETAG);
}
if (src_coap_msg_ptr->options_list_ptr->observe != COAP_OBSERVE_NONE) {
previous_option_number = (COAP_OPTION_OBSERVE);
}
if (src_coap_msg_ptr->options_list_ptr->uri_port != COAP_OPTION_URI_PORT_NONE) {
previous_option_number = (COAP_OPTION_URI_PORT);
}
if (src_coap_msg_ptr->options_list_ptr->location_path_ptr != NULL) {
previous_option_number = (COAP_OPTION_LOCATION_PATH);
}
if (src_coap_msg_ptr->uri_path_ptr != NULL) {
previous_option_number = (COAP_OPTION_URI_PATH);
}
if (src_coap_msg_ptr->content_format != COAP_CT_NONE) {
previous_option_number = (COAP_OPTION_CONTENT_FORMAT);
}
if (src_coap_msg_ptr->options_list_ptr->max_age != COAP_OPTION_MAX_AGE_DEFAULT) {
if ((COAP_OPTION_MAX_AGE - previous_option_number) > 12) {
needed_space += 1;
}
previous_option_number = (COAP_OPTION_MAX_AGE);
}
if (src_coap_msg_ptr->options_list_ptr->uri_query_ptr != NULL) {
if ((COAP_OPTION_URI_QUERY - previous_option_number) > 12) {
needed_space += 1;
}
previous_option_number = (COAP_OPTION_URI_QUERY);
}
if (src_coap_msg_ptr->options_list_ptr->accept != COAP_CT_NONE) {
if ((COAP_OPTION_ACCEPT - previous_option_number) > 12) {
needed_space += 1;
}
previous_option_number = (COAP_OPTION_ACCEPT);
}
if (src_coap_msg_ptr->options_list_ptr->location_query_ptr != NULL) {
if ((COAP_OPTION_LOCATION_QUERY - previous_option_number) > 12) {
needed_space += 1;
}
previous_option_number = (COAP_OPTION_LOCATION_QUERY);
}
if (src_coap_msg_ptr->options_list_ptr->block2 != COAP_OPTION_BLOCK_NONE) {
if ((COAP_OPTION_BLOCK2 - previous_option_number) > 12 ){
needed_space += 1;
}
previous_option_number = (COAP_OPTION_BLOCK2);
}
if (src_coap_msg_ptr->options_list_ptr->block1 != COAP_OPTION_BLOCK_NONE) {
if ((COAP_OPTION_BLOCK1 - previous_option_number) > 12 ){
needed_space += 1;
}
previous_option_number = (COAP_OPTION_BLOCK1);
}
if (src_coap_msg_ptr->options_list_ptr->use_size2) {
if ((COAP_OPTION_SIZE2 - previous_option_number) > 12) {
needed_space += 1;
}
previous_option_number = (COAP_OPTION_SIZE2);
}
if (src_coap_msg_ptr->options_list_ptr->proxy_uri_ptr != NULL) {
if ((COAP_OPTION_PROXY_URI - previous_option_number) > 12) {
needed_space += 1;
}
if ((COAP_OPTION_PROXY_URI - previous_option_number) > 269) { //Can not happen
needed_space += 1;
}
previous_option_number = (COAP_OPTION_PROXY_URI);
}
if (src_coap_msg_ptr->options_list_ptr->use_size1 ) {
if ((COAP_OPTION_SIZE1 - previous_option_number) > 12) {
needed_space += 1;
}
previous_option_number = (COAP_OPTION_SIZE1);
}
}
else {
if (src_coap_msg_ptr->uri_path_ptr != 0) {
previous_option_number = (COAP_OPTION_URI_PATH);
}
if (src_coap_msg_ptr->content_format != COAP_CT_NONE) {
previous_option_number = (COAP_OPTION_CONTENT_FORMAT);
}
}
return needed_space;
}
/**
* \fn static int8_t sn_coap_builder_header_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr)
*
* \brief Builds Header part of Packet data
*
* \param **dst_packet_data_pptr is destination for built Packet data
*
* \param *src_coap_msg_ptr is source for building Packet data
*
* \return Return value is 0 in ok case and -1 in failure case
**************************************************************************** */
static int8_t sn_coap_builder_header_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr)
{
/* * * * Check validity of Header values * * * */
if (sn_coap_header_validity_check(src_coap_msg_ptr, COAP_VERSION) != 0) {
return -1;
}
/* * * Add CoAP Version * * */
**dst_packet_data_pptr += COAP_VERSION;
/* * * Add Message type * * */
**dst_packet_data_pptr += src_coap_msg_ptr->msg_type;
/* * * Add Token length * * */
**dst_packet_data_pptr += (src_coap_msg_ptr->token_len);
(*dst_packet_data_pptr) ++;
/* * * Add Message code * * */
**dst_packet_data_pptr = src_coap_msg_ptr->msg_code;
(*dst_packet_data_pptr) ++;
/* * * Add Message ID * * */
**dst_packet_data_pptr = (uint8_t)(src_coap_msg_ptr->msg_id >> COAP_HEADER_MSG_ID_MSB_SHIFT); /* MSB part */
(*dst_packet_data_pptr) ++;
**dst_packet_data_pptr = (uint8_t)src_coap_msg_ptr->msg_id; /* LSB part */
(*dst_packet_data_pptr) ++;
/* Success */
return 0;
}
/**
* \fn static int8_t sn_coap_builder_options_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr)
*
* \brief Builds Options part of Packet data
*
* \param **dst_packet_data_pptr is destination for built Packet data
*
* \param *src_coap_msg_ptr is source for building Packet data
*
* \return Return value is 0 in every case
*/
static int8_t sn_coap_builder_options_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr)
{
/* * * * Check if Options are used at all * * * */
if (src_coap_msg_ptr->uri_path_ptr == NULL && src_coap_msg_ptr->token_ptr == NULL &&
src_coap_msg_ptr->content_format == COAP_CT_NONE && src_coap_msg_ptr->options_list_ptr == NULL) {
return 0;
}
/* * * * First add Token option * * * */
if (src_coap_msg_ptr->token_len && src_coap_msg_ptr->token_ptr) {
memcpy(*dst_packet_data_pptr, src_coap_msg_ptr->token_ptr, src_coap_msg_ptr->token_len);
}
(*dst_packet_data_pptr) += src_coap_msg_ptr->token_len;
/* Then build rest of the options */
/* * * * Initialize previous Option number for new built message * * * */
uint16_t previous_option_number = 0;
//missing: COAP_OPTION_IF_MATCH, COAP_OPTION_IF_NONE_MATCH, COAP_OPTION_SIZE
/* Check if less used options are used at all */
if (src_coap_msg_ptr->options_list_ptr != NULL) {
/* * * * Build Uri-Host option * * * */
sn_coap_builder_options_build_add_one_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->uri_host_len,
src_coap_msg_ptr->options_list_ptr->uri_host_ptr, COAP_OPTION_URI_HOST, &previous_option_number);
/* * * * Build ETag option * * * */
sn_coap_builder_options_build_add_multiple_option(dst_packet_data_pptr, &src_coap_msg_ptr->options_list_ptr->etag_ptr,
(uint16_t *)&src_coap_msg_ptr->options_list_ptr->etag_len, COAP_OPTION_ETAG, &previous_option_number);
/* * * * Build Observe option * * * * */
if (src_coap_msg_ptr->options_list_ptr->observe != COAP_OBSERVE_NONE) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->observe,
COAP_OPTION_OBSERVE, &previous_option_number);
}
/* * * * Build Uri-Port option * * * */
if (src_coap_msg_ptr->options_list_ptr->uri_port != COAP_OPTION_URI_PORT_NONE) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->uri_port,
COAP_OPTION_URI_PORT, &previous_option_number);
}
/* * * * Build Location-Path option * * * */
sn_coap_builder_options_build_add_multiple_option(dst_packet_data_pptr, &src_coap_msg_ptr->options_list_ptr->location_path_ptr,
&src_coap_msg_ptr->options_list_ptr->location_path_len, COAP_OPTION_LOCATION_PATH, &previous_option_number);
}
/* * * * Build Uri-Path option * * * */
sn_coap_builder_options_build_add_multiple_option(dst_packet_data_pptr, &src_coap_msg_ptr->uri_path_ptr,
&src_coap_msg_ptr->uri_path_len, COAP_OPTION_URI_PATH, &previous_option_number);
/* * * * Build Content-Type option * * * */
if (src_coap_msg_ptr->content_format != COAP_CT_NONE) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->content_format,
COAP_OPTION_CONTENT_FORMAT, &previous_option_number);
}
if (src_coap_msg_ptr->options_list_ptr != NULL) {
/* * * * Build Max-Age option * * * */
if (src_coap_msg_ptr->options_list_ptr->max_age != COAP_OPTION_MAX_AGE_DEFAULT) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->max_age,
COAP_OPTION_MAX_AGE, &previous_option_number);
}
/* * * * Build Uri-Query option * * * * */
sn_coap_builder_options_build_add_multiple_option(dst_packet_data_pptr, &src_coap_msg_ptr->options_list_ptr->uri_query_ptr,
&src_coap_msg_ptr->options_list_ptr->uri_query_len, COAP_OPTION_URI_QUERY, &previous_option_number);
/* * * * Build Accept option * * * * */
if (src_coap_msg_ptr->options_list_ptr->accept != COAP_CT_NONE) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->accept,
COAP_OPTION_ACCEPT, &previous_option_number);
}
}
if (src_coap_msg_ptr->options_list_ptr != NULL) {
/* * * * Build Location-Query option * * * */
sn_coap_builder_options_build_add_multiple_option(dst_packet_data_pptr, &src_coap_msg_ptr->options_list_ptr->location_query_ptr,
&src_coap_msg_ptr->options_list_ptr->location_query_len, COAP_OPTION_LOCATION_QUERY, &previous_option_number);
/* * * * Build Block2 option * * * * */
if (src_coap_msg_ptr->options_list_ptr->block2 != COAP_OPTION_BLOCK_NONE) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->block2,
COAP_OPTION_BLOCK2, &previous_option_number);
}
/* * * * Build Block1 option * * * * */
if (src_coap_msg_ptr->options_list_ptr->block1 != COAP_OPTION_BLOCK_NONE) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->block1,
COAP_OPTION_BLOCK1, &previous_option_number);
}
/* * * * Build Size2 option * * * */
if (src_coap_msg_ptr->options_list_ptr->use_size2) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->size2,
COAP_OPTION_SIZE2, &previous_option_number);
}
/* * * * Build Proxy-Uri option * * * */
sn_coap_builder_options_build_add_one_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->proxy_uri_len,
src_coap_msg_ptr->options_list_ptr->proxy_uri_ptr, COAP_OPTION_PROXY_URI, &previous_option_number);
/* * * * Build Size1 option * * * */
if (src_coap_msg_ptr->options_list_ptr->use_size1) {
sn_coap_builder_options_build_add_uint_option(dst_packet_data_pptr, src_coap_msg_ptr->options_list_ptr->size1,
COAP_OPTION_SIZE1, &previous_option_number);
}
}
/* Success */
return 0;
}
/**
* \fn static int16_t sn_coap_builder_options_build_add_one_option(uint8_t **dst_packet_data_pptr, uint16_t option_value_len, uint8_t *option_value_ptr, sn_coap_option_numbers_e option_number)
*
* \brief Adds Options part of Packet data
*
* \param **dst_packet_data_pptr is destination for built Packet data
*
* \param option_value_len is Option value length to be added
*
* \param *option_value_ptr is pointer to Option value data to be added
*
* \param option_number is Option number to be added
*
* \return Return value is 0 if option was not added, 1 if added
*/
static int16_t sn_coap_builder_options_build_add_one_option(uint8_t **dst_packet_data_pptr, uint16_t option_len,
uint8_t *option_ptr, sn_coap_option_numbers_e option_number, uint16_t *previous_option_number)
{
/* Check if there is option at all */
if (option_ptr != NULL) {
uint16_t option_delta;
option_delta = (option_number - *previous_option_number);
/* * * Build option header * * */
/* First option length without extended part */
if (option_len <= 12) {
**dst_packet_data_pptr = option_len;
}
else if (option_len > 12 && option_len < 269) {
**dst_packet_data_pptr = 0x0D;
}
else if (option_len >= 269) {
**dst_packet_data_pptr = 0x0E;
}
/* Then option delta with extensions, and move pointer */
if (option_delta <= 12) {
**dst_packet_data_pptr += (option_delta << 4);
*dst_packet_data_pptr += 1;
}
else if (option_delta > 12 && option_delta < 269) {
**dst_packet_data_pptr += 0xD0;
option_delta -= 13;
*(*dst_packet_data_pptr + 1) = (uint8_t)option_delta;
*dst_packet_data_pptr += 2;
}
//This is currently dead code (but possibly needed in future)
else if (option_delta >= 269) {
**dst_packet_data_pptr += 0xE0;
option_delta -= 269;
*(*dst_packet_data_pptr + 2) = (uint8_t)option_delta;
*(*dst_packet_data_pptr + 1) = (option_delta >> 8);
*dst_packet_data_pptr += 3;
}
/* Now option length extensions, if needed */
if (option_len > 12 && option_len < 269) {
**dst_packet_data_pptr = (uint8_t)(option_len - 13);
*dst_packet_data_pptr += 1;
}
else if (option_len >= 269) {
*(*dst_packet_data_pptr + 1) = (uint8_t)(option_len - 269);
**dst_packet_data_pptr = ((option_len - 269) >> 8);
*dst_packet_data_pptr += 2;
}
*previous_option_number = option_number;
/* Write Option value */
memcpy(*dst_packet_data_pptr, option_ptr, option_len);
/* Increase destination Packet data pointer */
(*dst_packet_data_pptr) += option_len;
return 1;
}
/* Success */
return 0;
}
/**
* \brief Constructs a uint Options part of Packet data
*
* \param **dst_packet_data_pptr is destination for built Packet data; NULL
* to compute size only.
*
* \param option_value is Option value to be added
*
* \param option_number is Option number to be added
*
* \return Return value is total option size, or -1 in write failure case
*/
static uint8_t sn_coap_builder_options_build_add_uint_option(uint8_t **dst_packet_data_pptr, uint32_t option_value, sn_coap_option_numbers_e option_number, uint16_t *previous_option_number)
{
uint8_t payload[4];
uint8_t len = 0;
/* Construct the variable-length payload representing the value */
for (uint8_t i = 0; i < 4; i++) {
if (len > 0 || (option_value & 0xff000000)) {
payload[len++] = option_value >> 24;
}
option_value <<= 8;
}
/* If output pointer isn't NULL, write it out */
if (dst_packet_data_pptr) {
int16_t ret = sn_coap_builder_options_build_add_one_option(dst_packet_data_pptr, len, payload, option_number, previous_option_number);
/* Allow for failure returns when writing (why even permit failure returns?) */
if (ret < 0) {
return ret;
}
}
/* Return the total option size */
return 1 + len;
}
/**
* \fn static int16_t sn_coap_builder_options_build_add_multiple_option(uint8_t **dst_packet_data_pptr, uint8_t **src_pptr, uint16_t *src_len_ptr, sn_coap_option_numbers_e option)
*
* \brief Builds Option Uri-Query from given CoAP Header structure to Packet data
*
* \param **dst_packet_data_pptr is destination for built Packet data
*
* \param uint8_t **src_pptr
*
* \param uint16_t *src_len_ptr
*
* \paramsn_coap_option_numbers_e option option to be added
*
* \return Return value is 0 always
*/
static int16_t sn_coap_builder_options_build_add_multiple_option(uint8_t **dst_packet_data_pptr, uint8_t **src_pptr, uint16_t *src_len_ptr, sn_coap_option_numbers_e option, uint16_t *previous_option_number)
{
/* Check if there is option at all */
if (*src_pptr != NULL) {
uint8_t *query_ptr = *src_pptr;
uint8_t query_part_count = 0;
uint16_t query_len = *src_len_ptr;
uint8_t i = 0;
uint16_t query_part_offset = 0;
/* Get query part count */
query_part_count = sn_coap_builder_options_get_option_part_count(query_len, query_ptr, option);
/* * * * Options by adding all parts to option * * * */
for (i = 0; i < query_part_count; i++) {
/* Get length of query part */
uint16_t one_query_part_len = sn_coap_builder_options_get_option_part_length_from_whole_option_string(query_len, query_ptr, i, option);
/* Get position of query part */
query_part_offset = sn_coap_builder_options_get_option_part_position(query_len, query_ptr, i, option);
/* Add Uri-query's one part to Options */
sn_coap_builder_options_build_add_one_option(dst_packet_data_pptr, one_query_part_len, *src_pptr + query_part_offset, option, previous_option_number);
}
}
/* Success */
return 0;
}
/**
* \fn static uint16_t sn_coap_builder_options_calc_option_size(uint16_t query_len, uint8_t *query_ptr, sn_coap_option_numbers_e option)
*
* \brief Calculates needed Packet data memory size for option
*
* \param path_len is length of calculated strting(s)
*
* \param *path_ptr is pointer to calculated options
*
* \return Return value is count of needed memory as bytes for Uri-query option
*/
static uint16_t sn_coap_builder_options_calc_option_size(uint16_t query_len, uint8_t *query_ptr, sn_coap_option_numbers_e option)
{
uint8_t query_part_count = sn_coap_builder_options_get_option_part_count(query_len, query_ptr, option);
uint8_t i = 0;
uint16_t ret_value = 0;
/* * * * * * * * * * * * * * * * * * * * * * * * */
/* * * * Calculate Uri-query options length * * */
/* * * * * * * * * * * * * * * * * * * * * * * * */
for (i = 0; i < query_part_count; i++) {
/* * * Length of Option number and Option value length * * */
/* Get length of Query part */
uint16_t one_query_part_len = sn_coap_builder_options_get_option_part_length_from_whole_option_string(query_len, query_ptr, i, option);
/* Check option length */
switch (option) {
case (COAP_OPTION_ETAG): /* Length 1-8 */
if (one_query_part_len < 1 || one_query_part_len > 8) {
return 0;
}
break;
case (COAP_OPTION_LOCATION_PATH): /* Length 0-255 */
case (COAP_OPTION_URI_PATH): /* Length 0-255 */
case (COAP_OPTION_LOCATION_QUERY): /* Length 0-255 */
if (one_query_part_len > 255) {
return 0;
}
break;
case (COAP_OPTION_URI_QUERY): /* Length 1-255 */
if (one_query_part_len < 1 || one_query_part_len > 255) {
return 0;
}
break;
// case (COAP_OPTION_ACCEPT): /* Length 0-2 */
// if (one_query_part_len > 2) {
// return 0;
// }
// break;
default:
break; //impossible scenario currently
}
/* Check if 4 bits are enough for writing Option value length */
if (one_query_part_len <= 12) {
/* 4 bits are enough for Option value length */
ret_value++;
} else if (one_query_part_len >= 13 && one_query_part_len < 269) {
/* Extra byte for Option value length is needed */
ret_value += 2;
}
//This can only happen if we are in default case above, currently is not happening
else if (one_query_part_len >= 270 && one_query_part_len < 1034) {
/* Extra bytes for Option value length is needed */
ret_value += 3;
}
/* * * Length of Option value * * */
/* Increase options length */
ret_value += one_query_part_len;
}
/* Success */
return ret_value;
}
/**
* \fn static uint8_t sn_coap_builder_options_get_option_part_count(uint16_t query_len, uint8_t *query_ptr, sn_coap_option_numbers_e option)
*
* \brief Gets query part count from whole option string
*
* \param query_len is length of whole Path
*
* \param *query_ptr is pointer to the start of whole Path
*
* \return Return value is count of query parts
*/
static uint8_t sn_coap_builder_options_get_option_part_count(uint16_t query_len, uint8_t *query_ptr, sn_coap_option_numbers_e option)
{
uint8_t returned_query_count = 0;
uint16_t query_len_index = 0;
uint8_t char_to_search = '&';
if (option == COAP_OPTION_URI_PATH || option == COAP_OPTION_LOCATION_PATH) {
char_to_search = '/';
}
/* Loop whole query and search '\0' characters (not first and last char) */
for (query_len_index = 1; query_len_index < query_len - 1; query_len_index++) {
/* If new query part starts */
if (*(query_ptr + query_len_index) == char_to_search) { /* If match */
returned_query_count++;
}
}
returned_query_count++;
return returned_query_count;
}
/**
* \fn static uint16_t sn_coap_builder_options_get_option_part_length_from_whole_option_string(uint16_t query_len,
uint8_t *query_ptr,
uint8_t query_index, sn_coap_option_numbers_e option)
*
* \brief Gets one's query part length from whole query string
*
* \param query_len is length of whole string
*
* \param *query_ptr is pointer to the start of whole string
*
* \param query_index is query part index to be found
*
* \param sn_coap_option_numbers_e option is option number of the option
*
* \return Return value is length of query part
*/
static uint16_t sn_coap_builder_options_get_option_part_length_from_whole_option_string(uint16_t query_len, uint8_t *query_ptr,
uint8_t query_index, sn_coap_option_numbers_e option)
{
uint16_t returned_query_part_len = 0;
uint8_t temp_query_index = 0;
uint16_t query_len_index = 0;
uint8_t char_to_search = '&';
if (option == COAP_OPTION_URI_PATH || option == COAP_OPTION_LOCATION_PATH) {
char_to_search = '/';
}
/* Loop whole query and search '\0' characters */
for (query_len_index = 0; query_len_index < query_len; query_len_index++) {
/* Store character to temp_char for helping debugging */
uint8_t temp_char = *query_ptr;
/* If new query part starts */
if (temp_char == char_to_search && returned_query_part_len > 0) { /* returned_query_part_len > 0 is for querys which start with "\0" */
/* If query part index is wanted */
if (temp_query_index == query_index) {
/* Return length of query part */
return returned_query_part_len;
} else {
/* Reset length of query part because wanted query part finding continues*/
returned_query_part_len = 0;
}
/* Next query part is looped */
temp_query_index++;
} else if (temp_char != char_to_search) { /* Else if query part continues */
/* Increase query part length */
returned_query_part_len++;
}
query_ptr++;
}
/* Return length of query part in cases that query part does not finish to '\0' character (last query part can be like that) */
return returned_query_part_len;
}
/**
* \fn static uint16_t sn_coap_builder_options_get_option_part_position(uint16_t query_len,
uint8_t *query_ptr,
uint8_t query_index, sn_coap_option_numbers_e option)
*
* \brief Gets query part position in whole query
*
* \param query_len is length of whole query
*
* \param *query_ptr is pointer to the start of whole query
*
* \param query_index is query part index to be found
*
* \return Return value is position (= offset) of query part in whole query. In
* fail cases -1 is returned.
*/
static int16_t sn_coap_builder_options_get_option_part_position(uint16_t query_len, uint8_t *query_ptr,
uint8_t query_index, sn_coap_option_numbers_e option)
{
uint16_t returned_query_part_offset = 0;
uint8_t temp_query_index = 0;
uint16_t query_len_index = 0;
uint8_t char_to_search = '&';
if (option == COAP_OPTION_URI_PATH || option == COAP_OPTION_LOCATION_PATH) {
char_to_search = '/';
}
if (query_index == 0) {
if (*query_ptr == 0 || *query_ptr == char_to_search) {
return 1;
} else {
return 0;
}
}
/* Loop whole query and search separator characters */
for (query_len_index = 0; query_len_index < query_len; query_len_index++) {
/* Store character to temp_char for helping debugging */
uint8_t temp_char = *query_ptr;
/* If new query part starts */
if (temp_char == char_to_search && returned_query_part_offset > 0) { /* returned_query_part_offset > 0 is for querys which start with searched char */
/* If query part index is wanted */
if (temp_query_index == (query_index - 1)) {
/* Return offset of query part */
return (returned_query_part_offset + 1); /* Plus one is for passing separator */
}
/* Next query part is looped */
temp_query_index++;
}
returned_query_part_offset++;
query_ptr++;
}
return -1; //Dead code?
}
/**
* \fn static void sn_coap_builder_payload_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr)
*
* \brief Builds Options part of Packet data
*
* \param **dst_packet_data_pptr is destination for built Packet data
*
* \param *src_coap_msg_ptr is source for building Packet data
*/
static void sn_coap_builder_payload_build(uint8_t **dst_packet_data_pptr, sn_coap_hdr_s *src_coap_msg_ptr)
{
/* Check if Payload is used at all */
if (src_coap_msg_ptr->payload_len && src_coap_msg_ptr->payload_ptr != NULL) {
/* Write Payload marker */
**dst_packet_data_pptr = 0xff;
(*dst_packet_data_pptr)++;
/* Write Payload */
memcpy(*dst_packet_data_pptr, src_coap_msg_ptr->payload_ptr, src_coap_msg_ptr->payload_len);
/* Increase destination Packet data pointer */
(*dst_packet_data_pptr) += src_coap_msg_ptr->payload_len;
}
}
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