/*
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* 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 separate responses.
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include "sys/cc.h"
#include <stdio.h>
#include <string.h>
#include "er-coap-separate.h"
#include "er-coap-transactions.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#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
/*---------------------------------------------------------------------------*/
/*- Separate Response API ---------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* \brief Reject a request that would require a separate response with an error message
*
* When the server does not have enough resources left to store the information
* for a separate response or otherwise cannot execute the resource handler,
* this function will respond with 5.03 Service Unavailable. The client can
* then retry later.
*/
void
coap_separate_reject()
{
/* TODO: Accept string pointer for custom error message */
erbium_status_code = SERVICE_UNAVAILABLE_5_03;
coap_error_message = "AlreadyInUse";
}
/*----------------------------------------------------------------------------*/
/**
* \brief Initiate a separate response with an empty ACK
* \param request The request to accept
* \param separate_store A pointer to the data structure that will store the
* relevant information for the response
*
* When the server does not have enough resources left to store the information
* for a separate response or otherwise cannot execute the resource handler,
* this function will respond with 5.03 Service Unavailable. The client can
* then retry later.
*/
void
coap_separate_accept(void *request, coap_separate_t *separate_store)
{
coap_packet_t *const coap_req = (coap_packet_t *)request;
coap_transaction_t *const t = coap_get_transaction_by_mid(coap_req->mid);
PRINTF("Separate ACCEPT: /%.*s MID %u\n", coap_req->uri_path_len,
coap_req->uri_path, coap_req->mid);
if(t) {
/* send separate ACK for CON */
if(coap_req->type == COAP_TYPE_CON) {
coap_packet_t ack[1];
/* ACK with empty code (0) */
coap_init_message(ack, COAP_TYPE_ACK, 0, coap_req->mid);
/* serializing into IPBUF: Only overwrites header parts that are already parsed into the request struct */
coap_send_message(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport,
(uip_appdata), coap_serialize_message(ack,
uip_appdata));
}
/* store remote address */
uip_ipaddr_copy(&separate_store->addr, &t->addr);
separate_store->port = t->port;
/* store correct response type */
separate_store->type =
coap_req->type == COAP_TYPE_CON ? COAP_TYPE_CON : COAP_TYPE_NON;
separate_store->mid = coap_get_mid(); /* if it was a NON, we burned one MID in the engine... */
memcpy(separate_store->token, coap_req->token, coap_req->token_len);
separate_store->token_len = coap_req->token_len;
separate_store->block1_num = coap_req->block1_num;
separate_store->block1_size = coap_req->block1_size;
separate_store->block2_num = coap_req->block2_num;
separate_store->block2_size = coap_req->block2_size > 0 ? MIN(COAP_MAX_BLOCK_SIZE, coap_req->block2_size) : COAP_MAX_BLOCK_SIZE;
/* signal the engine to skip automatic response and clear transaction by engine */
erbium_status_code = MANUAL_RESPONSE;
} else {
PRINTF("ERROR: Response transaction for separate request not found!\n");
erbium_status_code = INTERNAL_SERVER_ERROR_5_00;
}
}
/*----------------------------------------------------------------------------*/
void
coap_separate_resume(void *response, coap_separate_t *separate_store,
uint8_t code)
{
coap_init_message(response, separate_store->type, code,
separate_store->mid);
if(separate_store->token_len) {
coap_set_token(response, separate_store->token,
separate_store->token_len);
}
if(separate_store->block1_size) {
coap_set_header_block1(response, separate_store->block1_num,
0, separate_store->block1_size);
}
}
/*---------------------------------------------------------------------------*/