nes-proj/os/net/app-layer/coap/coap-block1.c
2017-09-01 17:22:04 +02:00

120 lines
4.7 KiB
C

/*
* Copyright (c) 2014, Lars Schmertmann <SmallLars@t-online.de>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* CoAP module for block 1 handling
* \author
* Lars Schmertmann <SmallLars@t-online.de>
*/
#include <stdio.h>
#include <string.h>
#include "coap.h"
#include "coap-block1.h"
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF("[%02x:%02x:%02x:%02x:%02x:%02x]", (lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3], (lladdr)->addr[4], (lladdr)->addr[5])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(addr)
#endif
/*----------------------------------------------------------------------------*/
/**
* \brief Block 1 support within a coap-ressource
*
* This function will help you to use block 1. If target is null
* error handling and response configuration is active. On return
* value 0, the last block was recived, while on return value 1
* more blocks will follow. With target, len and maxlen this
* function will assemble the blocks.
*
* You can find an example in:
* examples/er-rest-example/resources/res-b1-sep-b2.c
*
* \param request Request pointer from the handler
* \param response Response pointer from the handler
* \param target Pointer to the buffer where the request payload can be assembled
* \param len Pointer to the variable, where the function stores the actual length
* \param max_len Length of the "target"-Buffer
*
* \return 0 if initialisation was successful
* -1 if initialisation failed
*/
int
coap_block1_handler(void *request, void *response, uint8_t *target, size_t *len, size_t max_len)
{
const uint8_t *payload = 0;
int pay_len = REST.get_request_payload(request, &payload);
if(!pay_len || !payload) {
erbium_status_code = REST.status.BAD_REQUEST;
coap_error_message = "NoPayload";
return -1;
}
coap_packet_t *packet = (coap_packet_t *)request;
if(packet->block1_offset + pay_len > max_len) {
erbium_status_code = REST.status.REQUEST_ENTITY_TOO_LARGE;
coap_error_message = "Message to big";
return -1;
}
if(target && len) {
memcpy(target + packet->block1_offset, payload, pay_len);
*len = packet->block1_offset + pay_len;
}
if(IS_OPTION(packet, COAP_OPTION_BLOCK1)) {
PRINTF("Blockwise: block 1 request: Num: %u, More: %u, Size: %u, Offset: %u\n",
packet->block1_num,
packet->block1_more,
packet->block1_size,
packet->block1_offset);
coap_set_header_block1(response, packet->block1_num, packet->block1_more, packet->block1_size);
if(packet->block1_more) {
coap_set_status_code(response, CONTINUE_2_31);
return 1;
}
}
return 0;
}