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sdk-ameba-v4.0c_180328/component/common/network/coap/sn_coap_parser.c
jialexd f91efd1250 first add sdk
2019-04-02 16:34:25 +08:00

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/*
* 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_parser.c
*
* \brief CoAP Header parser
*
* Functionality: Parses CoAP Header
*
*/
/* * * * * * * * * * * * * * */
/* * * * INCLUDE FILES * * * */
/* * * * * * * * * * * * * * */
#include <stdio.h>
#include <string.h> /* For memset() and memcpy() */
#include "ns_types.h"
#include "sn_coap_header.h"
#include "sn_coap_protocol.h"
#include "sn_coap_header_internal.h"
#include "sn_coap_protocol_internal.h"
/* * * * * * * * * * * * * * * * * * * * */
/* * * * LOCAL FUNCTION PROTOTYPES * * * */
/* * * * * * * * * * * * * * * * * * * * */
static void sn_coap_parser_header_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, coap_version_e *coap_version_ptr);
static int8_t sn_coap_parser_options_parse(struct coap_s *handle, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, uint8_t *packet_data_start_ptr, uint16_t packet_len);
static int8_t sn_coap_parser_options_parse_multiple_options(struct coap_s *handle, uint8_t **packet_data_pptr, uint16_t packet_left_len, uint8_t **dst_pptr, uint16_t *dst_len_ptr, sn_coap_option_numbers_e option, uint16_t option_number_len);
static int16_t sn_coap_parser_options_count_needed_memory_multiple_option(uint8_t *packet_data_ptr, uint16_t packet_left_len, sn_coap_option_numbers_e option, uint16_t option_number_len);
static int8_t sn_coap_parser_payload_parse(uint16_t packet_data_len, uint8_t *packet_data_start_ptr, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr);
sn_coap_hdr_s *sn_coap_parser_init_message(sn_coap_hdr_s *coap_msg_ptr)
{
/* * * * Check given pointer * * * */
if (coap_msg_ptr == NULL) {
return NULL;
}
/* XXX not technically legal to memset pointers to 0 */
memset(coap_msg_ptr, 0x00, sizeof(sn_coap_hdr_s));
coap_msg_ptr->content_format = COAP_CT_NONE;
return coap_msg_ptr;
}
sn_coap_hdr_s *sn_coap_parser_alloc_message(struct coap_s *handle)
{
sn_coap_hdr_s *returned_coap_msg_ptr;
/* * * * Check given pointer * * * */
if (handle == NULL) {
return NULL;
}
/* * * * Allocate memory for returned CoAP message and initialize allocated memory with with default values * * * */
returned_coap_msg_ptr = handle->sn_coap_protocol_malloc(sizeof(sn_coap_hdr_s));
return sn_coap_parser_init_message(returned_coap_msg_ptr);
}
sn_coap_options_list_s *sn_coap_parser_alloc_options(struct coap_s *handle, sn_coap_hdr_s *coap_msg_ptr)
{
/* * * * Check given pointers * * * */
if (handle == NULL || coap_msg_ptr == NULL) {
return NULL;
}
/* * * * If the message already has options, return them * * * */
if (coap_msg_ptr->options_list_ptr) {
return coap_msg_ptr->options_list_ptr;
}
/* * * * Allocate memory for options and initialize allocated memory with with default values * * * */
coap_msg_ptr->options_list_ptr = handle->sn_coap_protocol_malloc(sizeof(sn_coap_options_list_s));
if (coap_msg_ptr->options_list_ptr == NULL) {
return NULL;
}
/* XXX not technically legal to memset pointers to 0 */
memset(coap_msg_ptr->options_list_ptr, 0x00, sizeof(sn_coap_options_list_s));
coap_msg_ptr->options_list_ptr->max_age = COAP_OPTION_MAX_AGE_DEFAULT;
coap_msg_ptr->options_list_ptr->uri_port = COAP_OPTION_URI_PORT_NONE;
coap_msg_ptr->options_list_ptr->observe = COAP_OBSERVE_NONE;
coap_msg_ptr->options_list_ptr->accept = COAP_CT_NONE;
coap_msg_ptr->options_list_ptr->block2 = COAP_OPTION_BLOCK_NONE;
coap_msg_ptr->options_list_ptr->block1 = COAP_OPTION_BLOCK_NONE;
return coap_msg_ptr->options_list_ptr;
}
sn_coap_hdr_s *sn_coap_parser(struct coap_s *handle, uint16_t packet_data_len, uint8_t *packet_data_ptr, coap_version_e *coap_version_ptr)
{
uint8_t *data_temp_ptr = packet_data_ptr;
sn_coap_hdr_s *parsed_and_returned_coap_msg_ptr = NULL;
/* * * * Check given pointer * * * */
if (packet_data_ptr == NULL || packet_data_len < 4 || handle == NULL) {
return NULL;
}
/* * * * Allocate and initialize CoAP message * * * */
parsed_and_returned_coap_msg_ptr = sn_coap_parser_alloc_message(handle);
if (parsed_and_returned_coap_msg_ptr == NULL) {
return NULL;
}
/* * * * Header parsing, move pointer over the header... * * * */
sn_coap_parser_header_parse(&data_temp_ptr, parsed_and_returned_coap_msg_ptr, coap_version_ptr);
/* * * * Options parsing, move pointer over the options... * * * */
if (sn_coap_parser_options_parse(handle, &data_temp_ptr, parsed_and_returned_coap_msg_ptr, packet_data_ptr, packet_data_len) != 0) {
parsed_and_returned_coap_msg_ptr->coap_status = COAP_STATUS_PARSER_ERROR_IN_HEADER;
return parsed_and_returned_coap_msg_ptr;
}
/* * * * Payload parsing * * * */
if (sn_coap_parser_payload_parse(packet_data_len, packet_data_ptr, &data_temp_ptr, parsed_and_returned_coap_msg_ptr) == -1) {
parsed_and_returned_coap_msg_ptr->coap_status = COAP_STATUS_PARSER_ERROR_IN_HEADER;
return parsed_and_returned_coap_msg_ptr;
}
/* * * * Return parsed CoAP message * * * * */
return parsed_and_returned_coap_msg_ptr;
}
void sn_coap_parser_release_allocated_coap_msg_mem(struct coap_s *handle, sn_coap_hdr_s *freed_coap_msg_ptr)
{
if (handle == NULL) {
return;
}
if (freed_coap_msg_ptr != NULL) {
if (freed_coap_msg_ptr->uri_path_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->uri_path_ptr);
}
if (freed_coap_msg_ptr->token_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->token_ptr);
}
if (freed_coap_msg_ptr->options_list_ptr != NULL) {
if (freed_coap_msg_ptr->options_list_ptr->proxy_uri_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr->proxy_uri_ptr);
}
if (freed_coap_msg_ptr->options_list_ptr->etag_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr->etag_ptr);
}
if (freed_coap_msg_ptr->options_list_ptr->uri_host_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr->uri_host_ptr);
}
if (freed_coap_msg_ptr->options_list_ptr->location_path_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr->location_path_ptr);
}
if (freed_coap_msg_ptr->options_list_ptr->location_query_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr->location_query_ptr);
}
if (freed_coap_msg_ptr->options_list_ptr->uri_query_ptr != NULL) {
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr->uri_query_ptr);
}
handle->sn_coap_protocol_free(freed_coap_msg_ptr->options_list_ptr);
}
handle->sn_coap_protocol_free(freed_coap_msg_ptr);
}
}
/**
* \fn static void sn_coap_parser_header_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, coap_version_e *coap_version_ptr)
*
* \brief Parses CoAP message's Header part from given Packet data
*
* \param **packet_data_ptr is source for Packet data to be parsed to CoAP message
*
* \param *dst_coap_msg_ptr is destination for parsed CoAP message
*
* \param *coap_version_ptr is destination for parsed CoAP specification version
*/
static void sn_coap_parser_header_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, coap_version_e *coap_version_ptr)
{
/* Parse CoAP Version and message type*/
*coap_version_ptr = (coap_version_e)(**packet_data_pptr & COAP_HEADER_VERSION_MASK);
dst_coap_msg_ptr->msg_type = (sn_coap_msg_type_e)(**packet_data_pptr & COAP_HEADER_MSG_TYPE_MASK);
(*packet_data_pptr) += 1;
/* Parse Message code */
dst_coap_msg_ptr->msg_code = (sn_coap_msg_code_e) **packet_data_pptr;
(*packet_data_pptr) += 1;
/* Parse Message ID */
dst_coap_msg_ptr->msg_id = *(*packet_data_pptr + 1);
dst_coap_msg_ptr->msg_id += **packet_data_pptr << COAP_HEADER_MSG_ID_MSB_SHIFT;
(*packet_data_pptr) += 2;
}
/**
* \brief Parses a variable-length uint value from an option
*
* \param **packet_data_pptr is source of option data to be parsed
* \param option_len is length of option data (will be 0-4)
*
* \return Return value is value of uint
*/
static uint32_t sn_coap_parser_options_parse_uint(uint8_t **packet_data_pptr, uint8_t option_len)
{
uint32_t value = 0;
while (option_len--) {
value <<= 8;
value |= *(*packet_data_pptr)++;
}
return value;
}
/**
* \fn static uint8_t sn_coap_parser_options_parse(uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr)
*
* \brief Parses CoAP message's Options part from given Packet data
*
* \param **packet_data_pptr is source of Packet data to be parsed to CoAP message
* \param *dst_coap_msg_ptr is destination for parsed CoAP message
*
* \return Return value is 0 in ok case and -1 in failure case
*/
static int8_t sn_coap_parser_options_parse(struct coap_s *handle, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr, uint8_t *packet_data_start_ptr, uint16_t packet_len)
{
uint8_t previous_option_number = 0;
uint8_t i = 0;
int8_t ret_status = 0;
uint16_t message_left = 0;
/* Parse token, if exists */
dst_coap_msg_ptr->token_len = *packet_data_start_ptr & COAP_HEADER_TOKEN_LENGTH_MASK;
if (dst_coap_msg_ptr->token_len) {
if ((dst_coap_msg_ptr->token_len > 8) || dst_coap_msg_ptr->token_ptr) {
return -1;
}
dst_coap_msg_ptr->token_ptr = handle->sn_coap_protocol_malloc(dst_coap_msg_ptr->token_len);
if (dst_coap_msg_ptr->token_ptr == NULL) {
return -1;
}
memcpy(dst_coap_msg_ptr->token_ptr, *packet_data_pptr, dst_coap_msg_ptr->token_len);
(*packet_data_pptr) += dst_coap_msg_ptr->token_len;
}
message_left = packet_len - ((*packet_data_pptr) - packet_data_start_ptr);
/* Loop all Options */
while (message_left && (**packet_data_pptr != 0xff)) {
/* Get option length WITHOUT extensions */
uint16_t option_len = (**packet_data_pptr & 0x0F);
/* Option number length 15 is reserved for the future use - ERROR */
if (option_len == 15) {
return -1;
}
/* Resolve option delta */
uint16_t option_number = (**packet_data_pptr >> COAP_OPTIONS_OPTION_NUMBER_SHIFT);
if (option_number == 13) {
option_number = *(*packet_data_pptr + 1) + 13;
(*packet_data_pptr)++;
} else if (option_number == 14) {
option_number = *(*packet_data_pptr + 2);
option_number += (*(*packet_data_pptr + 1) << 8) + 269;
(*packet_data_pptr) += 2;
}
/* Option number 15 reserved for payload marker. This is handled as a error! */
else if (option_number == 15) {
return -1;
}
/* Add previous option to option delta and get option number */
option_number += previous_option_number;
/* Add possible option length extension to resolve full length of the option */
if (option_len == 13) {
option_len = *(*packet_data_pptr + 1) + 13;
(*packet_data_pptr)++;
} else if (option_len == 14) {
option_len = *(*packet_data_pptr + 2);
option_len += (*(*packet_data_pptr + 1) << 8) + 269;
(*packet_data_pptr) += 2;
}
message_left = packet_len - (*packet_data_pptr - packet_data_start_ptr);
/* * * Parse option itself * * */
/* Some options are handled independently in own functions */
previous_option_number = option_number;
/* Allocate options_list_ptr if needed */
switch (option_number) {
case COAP_OPTION_MAX_AGE:
case COAP_OPTION_PROXY_URI:
case COAP_OPTION_ETAG:
case COAP_OPTION_URI_HOST:
case COAP_OPTION_LOCATION_PATH:
case COAP_OPTION_URI_PORT:
case COAP_OPTION_LOCATION_QUERY:
case COAP_OPTION_OBSERVE:
case COAP_OPTION_URI_QUERY:
case COAP_OPTION_BLOCK2:
case COAP_OPTION_BLOCK1:
case COAP_OPTION_ACCEPT:
case COAP_OPTION_SIZE1:
case COAP_OPTION_SIZE2:
if (sn_coap_parser_alloc_options(handle, dst_coap_msg_ptr) == NULL) {
return -1;
}
break;
}
/* Parse option */
switch (option_number) {
case COAP_OPTION_CONTENT_FORMAT:
if ((option_len > 2) || (dst_coap_msg_ptr->content_format != COAP_CT_NONE)) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->content_format = (sn_coap_content_format_e) sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_MAX_AGE:
if (option_len > 4) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->max_age = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_PROXY_URI:
if ((option_len > 1034) || (option_len < 1) || dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr) {
return -1;
}
dst_coap_msg_ptr->options_list_ptr->proxy_uri_len = option_len;
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr = handle->sn_coap_protocol_malloc(option_len);
if (dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr == NULL) {
return -1;
}
memcpy(dst_coap_msg_ptr->options_list_ptr->proxy_uri_ptr, *packet_data_pptr, option_len);
(*packet_data_pptr) += option_len;
break;
case COAP_OPTION_ETAG:
/* This is managed independently because User gives this option in one character table */
ret_status = sn_coap_parser_options_parse_multiple_options(handle, packet_data_pptr,
message_left,
&dst_coap_msg_ptr->options_list_ptr->etag_ptr,
(uint16_t *)&dst_coap_msg_ptr->options_list_ptr->etag_len,
COAP_OPTION_ETAG, option_len);
if (ret_status >= 0) {
i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
} else {
return -1;
}
break;
case COAP_OPTION_URI_HOST:
if ((option_len > 255) || (option_len < 1) || dst_coap_msg_ptr->options_list_ptr->uri_host_ptr) {
return -1;
}
dst_coap_msg_ptr->options_list_ptr->uri_host_len = option_len;
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->uri_host_ptr = handle->sn_coap_protocol_malloc(option_len);
if (dst_coap_msg_ptr->options_list_ptr->uri_host_ptr == NULL) {
return -1;
}
memcpy(dst_coap_msg_ptr->options_list_ptr->uri_host_ptr, *packet_data_pptr, option_len);
(*packet_data_pptr) += option_len;
break;
case COAP_OPTION_LOCATION_PATH:
if (dst_coap_msg_ptr->options_list_ptr->location_path_ptr) {
return -1;
}
/* This is managed independently because User gives this option in one character table */
ret_status = sn_coap_parser_options_parse_multiple_options(handle, packet_data_pptr, message_left,
&dst_coap_msg_ptr->options_list_ptr->location_path_ptr, &dst_coap_msg_ptr->options_list_ptr->location_path_len,
COAP_OPTION_LOCATION_PATH, option_len);
if (ret_status >= 0) {
i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
} else {
return -1;
}
break;
case COAP_OPTION_URI_PORT:
if ((option_len > 2) || dst_coap_msg_ptr->options_list_ptr->uri_port != COAP_OPTION_URI_PORT_NONE) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->uri_port = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_LOCATION_QUERY:
ret_status = sn_coap_parser_options_parse_multiple_options(handle, packet_data_pptr, message_left,
&dst_coap_msg_ptr->options_list_ptr->location_query_ptr, &dst_coap_msg_ptr->options_list_ptr->location_query_len,
COAP_OPTION_LOCATION_QUERY, option_len);
if (ret_status >= 0) {
i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
} else {
return -1;
}
break;
case COAP_OPTION_URI_PATH:
ret_status = sn_coap_parser_options_parse_multiple_options(handle, packet_data_pptr, message_left,
&dst_coap_msg_ptr->uri_path_ptr, &dst_coap_msg_ptr->uri_path_len,
COAP_OPTION_URI_PATH, option_len);
if (ret_status >= 0) {
i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
} else {
return -1;
}
break;
case COAP_OPTION_OBSERVE:
if ((option_len > 2) || dst_coap_msg_ptr->options_list_ptr->observe != COAP_OBSERVE_NONE) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->observe = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_URI_QUERY:
ret_status = sn_coap_parser_options_parse_multiple_options(handle, packet_data_pptr, message_left,
&dst_coap_msg_ptr->options_list_ptr->uri_query_ptr, &dst_coap_msg_ptr->options_list_ptr->uri_query_len,
COAP_OPTION_URI_QUERY, option_len);
if (ret_status >= 0) {
i += (ret_status - 1); /* i += is because possible several Options are handled by sn_coap_parser_options_parse_multiple_options() */
} else {
return -1;
}
break;
case COAP_OPTION_BLOCK2:
if ((option_len > 3) || dst_coap_msg_ptr->options_list_ptr->block2 != COAP_OPTION_BLOCK_NONE) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->block2 = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_BLOCK1:
if ((option_len > 3) || dst_coap_msg_ptr->options_list_ptr->block1 != COAP_OPTION_BLOCK_NONE) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->block1 = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_ACCEPT:
if ((option_len > 2) || (dst_coap_msg_ptr->options_list_ptr->accept != COAP_CT_NONE)) {
return -1;
}
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->accept = (sn_coap_content_format_e) sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_SIZE1:
if ((option_len > 4) || dst_coap_msg_ptr->options_list_ptr->use_size1) {
return -1;
}
dst_coap_msg_ptr->options_list_ptr->use_size1 = true;
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->size1 = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
case COAP_OPTION_SIZE2:
if ((option_len > 4) || dst_coap_msg_ptr->options_list_ptr->use_size2) {
return -1;
}
dst_coap_msg_ptr->options_list_ptr->use_size2 = true;
(*packet_data_pptr)++;
dst_coap_msg_ptr->options_list_ptr->size2 = sn_coap_parser_options_parse_uint(packet_data_pptr, option_len);
break;
default:
return -1;
}
/* Check for overflow */
if ((*packet_data_pptr - packet_data_start_ptr) > packet_len) {
return -1;
}
message_left = packet_len - (*packet_data_pptr - packet_data_start_ptr);
}
return 0;
}
/**
* \fn static int8_t sn_coap_parser_options_parse_multiple_options(uint8_t **packet_data_pptr, uint8_t options_count_left, uint8_t *previous_option_number_ptr, uint8_t **dst_pptr,
* uint16_t *dst_len_ptr, sn_coap_option_numbers_e option, uint16_t option_number_len)
*
* \brief Parses CoAP message's Uri-query options
*
* \param **packet_data_pptr is source for Packet data to be parsed to CoAP message
*
* \param *dst_coap_msg_ptr is destination for parsed CoAP message
*
* \param options_count_left tells how many options are unhandled in Packet data
*
* \param *previous_option_number_ptr is pointer to used and returned previous Option number
*
* \return Return value is count of Uri-query optios parsed. In failure case -1 is returned.
*/
static int8_t sn_coap_parser_options_parse_multiple_options(struct coap_s *handle, uint8_t **packet_data_pptr, uint16_t packet_left_len, uint8_t **dst_pptr, uint16_t *dst_len_ptr, sn_coap_option_numbers_e option, uint16_t option_number_len)
{
int16_t uri_query_needed_heap = sn_coap_parser_options_count_needed_memory_multiple_option(*packet_data_pptr, packet_left_len, option, option_number_len);
uint8_t *temp_parsed_uri_query_ptr = NULL;
uint8_t returned_option_counter = 0;
if (uri_query_needed_heap == -1) {
return -1;
}
if (uri_query_needed_heap) {
*dst_pptr = (uint8_t *) handle->sn_coap_protocol_malloc(uri_query_needed_heap);
if (*dst_pptr == NULL) {
return -1;
}
}
*dst_len_ptr = uri_query_needed_heap;
temp_parsed_uri_query_ptr = *dst_pptr;
/* Loop all Uri-Query options */
while ((temp_parsed_uri_query_ptr - *dst_pptr) < uri_query_needed_heap) {
/* Check if this is first Uri-Query option */
if (returned_option_counter > 0) {
/* Uri-Query is modified to following format: temp1'\0'temp2'\0'temp3 i.e. */
/* Uri-Path is modified to following format: temp1\temp2\temp3 i.e. */
if (option == COAP_OPTION_URI_QUERY || option == COAP_OPTION_LOCATION_QUERY || option == COAP_OPTION_ETAG || option == COAP_OPTION_ACCEPT) {
memset(temp_parsed_uri_query_ptr, '&', 1);
} else if (option == COAP_OPTION_URI_PATH || option == COAP_OPTION_LOCATION_PATH) {
memset(temp_parsed_uri_query_ptr, '/', 1);
}
temp_parsed_uri_query_ptr++;
}
returned_option_counter++;
(*packet_data_pptr)++;
if (((temp_parsed_uri_query_ptr - *dst_pptr) + option_number_len) > uri_query_needed_heap) {
return -1;
}
memcpy(temp_parsed_uri_query_ptr, *packet_data_pptr, option_number_len);
(*packet_data_pptr) += option_number_len;
temp_parsed_uri_query_ptr += option_number_len;
if ((temp_parsed_uri_query_ptr - *dst_pptr) >= uri_query_needed_heap || ((**packet_data_pptr >> COAP_OPTIONS_OPTION_NUMBER_SHIFT) != 0)) {
return returned_option_counter;
}
option_number_len = (**packet_data_pptr & 0x0F);
if (option_number_len == 13) {
option_number_len = *(*packet_data_pptr + 1) + 13;
(*packet_data_pptr)++;
} else if (option_number_len == 14) {
option_number_len = *(*packet_data_pptr + 2);
option_number_len += (*(*packet_data_pptr + 1) << 8) + 269;
(*packet_data_pptr) += 2;
}
}
return returned_option_counter;
}
/**
* \fn static uint16_t sn_coap_parser_options_count_needed_memory_multiple_option(uint8_t *packet_data_ptr, uint8_t options_count_left, uint8_t previous_option_number, sn_coap_option_numbers_e option, uint16_t option_number_len)
*
* \brief Counts needed memory for uri query option
*
* \param *packet_data_ptr is start of source for Packet data to be parsed to CoAP message
*
* \param options_count_left tells how many options are unhandled in Packet data
*
* \param previous_option_number is previous Option number
*
* \param sn_coap_option_numbers_e option option number to be calculated
*
* \param uint16_t option_number_len length of the first option part
*/
static int16_t sn_coap_parser_options_count_needed_memory_multiple_option(uint8_t *packet_data_ptr, uint16_t packet_left_len, sn_coap_option_numbers_e option, uint16_t option_number_len)
{
uint16_t ret_value = 0;
uint16_t i = 1;
/* Loop all Uri-Query options */
while (i <= packet_left_len) {
if (option == COAP_OPTION_LOCATION_PATH && option_number_len > 255) {
return -1;
}
if (option == COAP_OPTION_URI_PATH && option_number_len > 255) {
return -1;
}
if (option == COAP_OPTION_URI_QUERY && option_number_len > 255) {
return -1;
}
if (option == COAP_OPTION_LOCATION_QUERY && option_number_len > 255) {
return -1;
}
if (option == COAP_OPTION_ACCEPT && option_number_len > 2) {
return -1;
}
if (option == COAP_OPTION_ETAG && option_number_len > 8) {
return -1;
}
i += option_number_len;
ret_value += option_number_len + 1; /* + 1 is for separator */
if( i == packet_left_len ) {
break;
}
else if( i > packet_left_len ) {
return -1;
}
if ((*(packet_data_ptr + i) >> COAP_OPTIONS_OPTION_NUMBER_SHIFT) != 0) {
return (ret_value - 1); /* -1 because last Part path does not include separator */
}
option_number_len = (*(packet_data_ptr + i) & 0x0F);
if (option_number_len == 13) {
if(i + 1 >= packet_left_len) {
return -1;
}
i++;
option_number_len = *(packet_data_ptr + i) + 13;
} else if (option_number_len == 14) {
if(i + 2 >= packet_left_len) {
return -1;
}
option_number_len = *(packet_data_ptr + i + 2);
option_number_len += (*(packet_data_ptr + i + 1) << 8) + 269;
i += 2;
} else if (option_number_len == 15) {
return -1;
}
i++;
}
if (ret_value != 0) {
return (ret_value - 1); /* -1 because last Part path does not include separator */
} else {
return 0;
}
}
/**
* \fn static void sn_coap_parser_payload_parse(uint16_t packet_data_len, uint8_t *packet_data_ptr, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr)
*
* \brief Parses CoAP message's Payload part from given Packet data
*
* \param packet_data_len is length of given Packet data to be parsed to CoAP message
*
* \param *packet_data_ptr is start of source for Packet data to be parsed to CoAP message
*
* \param **packet_data_pptr is source for Packet data to be parsed to CoAP message
*
* \param *dst_coap_msg_ptr is destination for parsed CoAP message
*****************************************************************************/
static int8_t sn_coap_parser_payload_parse(uint16_t packet_data_len, uint8_t *packet_data_start_ptr, uint8_t **packet_data_pptr, sn_coap_hdr_s *dst_coap_msg_ptr)
{
/* If there is payload */
if ((*packet_data_pptr - packet_data_start_ptr) < packet_data_len) {
if (**packet_data_pptr == 0xff) {
(*packet_data_pptr)++;
/* Parse Payload length */
dst_coap_msg_ptr->payload_len = packet_data_len - (*packet_data_pptr - packet_data_start_ptr);
/* The presence of a marker followed by a zero-length payload MUST be processed as a message format error */
if (dst_coap_msg_ptr->payload_len == 0) {
return -1;
}
/* Parse Payload by setting CoAP message's payload_ptr to point Payload in Packet data */
dst_coap_msg_ptr->payload_ptr = *packet_data_pptr;
}
/* No payload marker.. */
else {
return -1;
}
}
return 0;
}
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