142 lines
6.1 KiB
C
142 lines
6.1 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* CoAP module for separate responses.
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "er-coap-separate.h"
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#include "er-coap-transactions.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#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])
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#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])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(addr)
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#endif
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/*---------------------------------------------------------------------------*/
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/*- Separate Response API ---------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Reject a request that would require a separate response with an error message
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*
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* When the server does not have enough resources left to store the information
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* for a separate response or otherwise cannot execute the resource handler,
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* this function will respond with 5.03 Service Unavailable. The client can
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* then retry later.
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*/
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void
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coap_separate_reject()
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{
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/* TODO: Accept string pointer for custom error message */
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erbium_status_code = SERVICE_UNAVAILABLE_5_03;
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coap_error_message = "AlreadyInUse";
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Initiate a separate response with an empty ACK
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* \param request The request to accept
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* \param separate_store A pointer to the data structure that will store the
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* relevant information for the response
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*
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* When the server does not have enough resources left to store the information
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* for a separate response or otherwise cannot execute the resource handler,
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* this function will respond with 5.03 Service Unavailable. The client can
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* then retry later.
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*/
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void
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coap_separate_accept(void *request, coap_separate_t *separate_store)
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{
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coap_packet_t *const coap_req = (coap_packet_t *)request;
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coap_transaction_t *const t = coap_get_transaction_by_mid(coap_req->mid);
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PRINTF("Separate ACCEPT: /%.*s MID %u\n", coap_req->uri_path_len,
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coap_req->uri_path, coap_req->mid);
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if(t) {
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/* send separate ACK for CON */
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if(coap_req->type == COAP_TYPE_CON) {
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coap_packet_t ack[1];
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/* ACK with empty code (0) */
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coap_init_message(ack, COAP_TYPE_ACK, 0, coap_req->mid);
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/* serializing into IPBUF: Only overwrites header parts that are already parsed into the request struct */
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coap_send_message(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport,
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(uip_appdata), coap_serialize_message(ack,
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uip_appdata));
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}
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/* store remote address */
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uip_ipaddr_copy(&separate_store->addr, &t->addr);
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separate_store->port = t->port;
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/* store correct response type */
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separate_store->type =
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coap_req->type == COAP_TYPE_CON ? COAP_TYPE_CON : COAP_TYPE_NON;
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separate_store->mid = coap_get_mid(); /* if it was a NON, we burned one MID in the engine... */
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memcpy(separate_store->token, coap_req->token, coap_req->token_len);
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separate_store->token_len = coap_req->token_len;
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separate_store->block2_num = coap_req->block2_num;
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separate_store->block2_size = coap_req->block2_size;
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/* signal the engine to skip automatic response and clear transaction by engine */
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erbium_status_code = MANUAL_RESPONSE;
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} else {
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PRINTF("ERROR: Response transaction for separate request not found!\n");
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erbium_status_code = INTERNAL_SERVER_ERROR_5_00;
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}
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}
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/*----------------------------------------------------------------------------*/
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void
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coap_separate_resume(void *response, coap_separate_t *separate_store,
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uint8_t code)
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{
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coap_init_message(response, separate_store->type, code,
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separate_store->mid);
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if(separate_store->token_len) {
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coap_set_token(response, separate_store->token,
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separate_store->token_len);
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}
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}
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/*---------------------------------------------------------------------------*/
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