503 lines
18 KiB
C
503 lines
18 KiB
C
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/*
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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 implementation for the REST Engine.
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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 <stdlib.h>
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#include <string.h>
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#include "er-coap-engine.h"
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#define DEBUG DEBUG_NONE
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#include "net/uip-debug.h"
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PROCESS(coap_engine, "CoAP Engine");
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/*---------------------------------------------------------------------------*/
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/*- Variables ---------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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static service_callback_t service_cbk = NULL;
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/*---------------------------------------------------------------------------*/
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/*- Internal API ------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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static int
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coap_receive(void)
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{
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erbium_status_code = NO_ERROR;
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PRINTF("handle_incoming_data(): received uip_datalen=%u \n",
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(uint16_t) uip_datalen());
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/* static declaration reduces stack peaks and program code size */
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static coap_packet_t message[1]; /* this way the packet can be treated as pointer as usual */
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static coap_packet_t response[1];
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static coap_transaction_t *transaction = NULL;
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if(uip_newdata()) {
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PRINTF("receiving UDP datagram from: ");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF(":%u\n Length: %u\n", uip_ntohs(UIP_UDP_BUF->srcport),
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uip_datalen());
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erbium_status_code =
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coap_parse_message(message, uip_appdata, uip_datalen());
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if(erbium_status_code == NO_ERROR) {
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/*TODO duplicates suppression, if required by application */
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PRINTF(" Parsed: v %u, t %u, tkl %u, c %u, mid %u\n", message->version,
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message->type, message->token_len, message->code, message->mid);
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PRINTF(" URL: %.*s\n", message->uri_path_len, message->uri_path);
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PRINTF(" Payload: %.*s\n", message->payload_len, message->payload);
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/* handle requests */
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if(message->code >= COAP_GET && message->code <= COAP_DELETE) {
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/* use transaction buffer for response to confirmable request */
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if((transaction =
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coap_new_transaction(message->mid, &UIP_IP_BUF->srcipaddr,
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UIP_UDP_BUF->srcport))) {
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uint32_t block_num = 0;
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uint16_t block_size = REST_MAX_CHUNK_SIZE;
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uint32_t block_offset = 0;
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int32_t new_offset = 0;
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/* prepare response */
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if(message->type == COAP_TYPE_CON) {
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/* reliable CON requests are answered with an ACK */
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coap_init_message(response, COAP_TYPE_ACK, CONTENT_2_05,
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message->mid);
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} else {
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/* unreliable NON requests are answered with a NON as well */
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coap_init_message(response, COAP_TYPE_NON, CONTENT_2_05,
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coap_get_mid());
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}
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/* mirror token */
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if(message->token_len) {
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coap_set_token(response, message->token, message->token_len);
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}
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/* get offset for blockwise transfers */
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if(coap_get_header_block2
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(message, &block_num, NULL, &block_size, &block_offset)) {
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PRINTF("Blockwise: block request %lu (%u/%u) @ %lu bytes\n",
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block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
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block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
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new_offset = block_offset;
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}
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/* invoke resource handler */
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if(service_cbk) {
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/* call REST framework and check if found and allowed */
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if(service_cbk
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(message, response, transaction->packet + COAP_MAX_HEADER_SIZE,
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block_size, &new_offset)) {
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if(erbium_status_code == NO_ERROR) {
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//TODO coap_handle_blockwise(request, response, start_offset, end_offset);
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/* resource is unaware of Block1 */
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if(IS_OPTION(message, COAP_OPTION_BLOCK1)
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&& response->code < BAD_REQUEST_4_00
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&& !IS_OPTION(response, COAP_OPTION_BLOCK1)) {
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PRINTF("Block1 NOT IMPLEMENTED\n");
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erbium_status_code = NOT_IMPLEMENTED_5_01;
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coap_error_message = "NoBlock1Support";
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/* client requested Block2 transfer */
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} else if(IS_OPTION(message, COAP_OPTION_BLOCK2)) {
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/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
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if(new_offset == block_offset) {
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PRINTF
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("Blockwise: unaware resource with payload length %u/%u\n",
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response->payload_len, block_size);
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if(block_offset >= response->payload_len) {
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PRINTF
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("handle_incoming_data(): block_offset >= response->payload_len\n");
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response->code = BAD_OPTION_4_02;
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coap_set_payload(response, "BlockOutOfScope", 15); /* a const char str[] and sizeof(str) produces larger code size */
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} else {
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coap_set_header_block2(response, block_num,
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response->payload_len -
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block_offset > block_size,
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block_size);
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coap_set_payload(response,
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response->payload + block_offset,
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MIN(response->payload_len -
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block_offset, block_size));
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} /* if(valid offset) */
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/* resource provides chunk-wise data */
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} else {
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PRINTF("Blockwise: blockwise resource, new offset %ld\n",
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new_offset);
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coap_set_header_block2(response, block_num,
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new_offset != -1
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block_size, block_size);
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if(response->payload_len > block_size) {
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coap_set_payload(response, response->payload,
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block_size);
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}
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} /* if(resource aware of blockwise) */
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/* Resource requested Block2 transfer */
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} else if(new_offset != 0) {
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PRINTF
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("Blockwise: no block option for blockwise resource, using block size %u\n",
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REST_MAX_CHUNK_SIZE);
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coap_set_header_block2(response, 0, new_offset != -1,
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REST_MAX_CHUNK_SIZE);
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coap_set_payload(response, response->payload,
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MIN(response->payload_len,
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REST_MAX_CHUNK_SIZE));
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} /* blockwise transfer handling */
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} /* no errors/hooks */
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} /* successful service callback */
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/* serialize response */
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if(erbium_status_code == NO_ERROR) {
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if((transaction->packet_len = coap_serialize_message(response,
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transaction->
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packet)) ==
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0) {
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erbium_status_code = PACKET_SERIALIZATION_ERROR;
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}
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}
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} else {
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erbium_status_code = NOT_IMPLEMENTED_5_01;
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coap_error_message = "NoServiceCallbck"; /* no 'a' to fit into 16 bytes */
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} /* if(service callback) */
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} else {
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erbium_status_code = SERVICE_UNAVAILABLE_5_03;
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coap_error_message = "NoFreeTraBuffer";
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} /* if(transaction buffer) */
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/* handle responses */
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} else {
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if(message->type == COAP_TYPE_CON && message->code == 0) {
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PRINTF("Received Ping\n");
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erbium_status_code = PING_RESPONSE;
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} else if(message->type == COAP_TYPE_ACK) {
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/* transactions are closed through lookup below */
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PRINTF("Received ACK\n");
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} else if(message->type == COAP_TYPE_RST) {
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PRINTF("Received RST\n");
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/* cancel possible subscriptions */
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coap_remove_observer_by_mid(&UIP_IP_BUF->srcipaddr,
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UIP_UDP_BUF->srcport, message->mid);
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}
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if((transaction = coap_get_transaction_by_mid(message->mid))) {
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/* free transaction memory before callback, as it may create a new transaction */
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restful_response_handler callback = transaction->callback;
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void *callback_data = transaction->callback_data;
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coap_clear_transaction(transaction);
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/* check if someone registered for the response */
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if(callback) {
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callback(callback_data, message);
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}
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}
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/* if(ACKed transaction) */
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transaction = NULL;
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} /* request or response */
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} /* parsed correctly */
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/* if(parsed correctly) */
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if(erbium_status_code == NO_ERROR) {
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if(transaction)
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coap_send_transaction(transaction);
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} else if(erbium_status_code == MANUAL_RESPONSE) {
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PRINTF("Clearing transaction for manual response");
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coap_clear_transaction(transaction);
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} else {
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coap_message_type_t reply_type = COAP_TYPE_ACK;
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PRINTF("ERROR %u: %s\n", erbium_status_code, coap_error_message);
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coap_clear_transaction(transaction);
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if(erbium_status_code == PING_RESPONSE) {
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erbium_status_code = 0;
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reply_type = COAP_TYPE_RST;
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} else if(erbium_status_code >= 192) {
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/* set to sendable error code */
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erbium_status_code = INTERNAL_SERVER_ERROR_5_00;
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}
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/* reuse input buffer for error message */
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coap_init_message(message, reply_type, erbium_status_code,
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message->mid);
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coap_set_payload(message, coap_error_message,
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strlen(coap_error_message));
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coap_send_message(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport,
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uip_appdata, coap_serialize_message(message,
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uip_appdata));
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}
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}
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/* if(new data) */
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return erbium_status_code;
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}
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/*---------------------------------------------------------------------------*/
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void
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coap_init_engine(void)
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{
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process_start(&coap_engine, NULL);
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}
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/*---------------------------------------------------------------------------*/
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void
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coap_set_service_callback(service_callback_t callback)
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{
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service_cbk = callback;
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}
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/*---------------------------------------------------------------------------*/
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rest_resource_flags_t
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coap_get_rest_method(void *packet)
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{
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return (rest_resource_flags_t) (1 <<
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(((coap_packet_t *) packet)->code - 1));
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}
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/*---------------------------------------------------------------------------*/
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/*- Server Part -------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* the discover resource is automatically included for CoAP */
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extern resource_t res_well_known_core;
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(coap_engine, ev, data)
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{
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PROCESS_BEGIN();
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PRINTF("Starting %s receiver...\n", coap_rest_implementation.name);
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rest_activate_resource(&res_well_known_core, ".well-known/core");
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coap_register_as_transaction_handler();
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coap_init_connection(SERVER_LISTEN_PORT);
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while(1) {
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PROCESS_YIELD();
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if(ev == tcpip_event) {
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coap_receive();
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} else if(ev == PROCESS_EVENT_TIMER) {
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/* retransmissions are handled here */
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coap_check_transactions();
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}
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} /* while (1) */
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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/*- Client Part -------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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void
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coap_blocking_request_callback(void *callback_data, void *response)
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{
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struct request_state_t *state = (struct request_state_t *)callback_data;
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state->response = (coap_packet_t *) response;
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process_poll(state->process);
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}
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/*---------------------------------------------------------------------------*/
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PT_THREAD(coap_blocking_request
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(struct request_state_t *state, process_event_t ev,
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uip_ipaddr_t * remote_ipaddr, uint16_t remote_port,
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coap_packet_t * request,
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blocking_response_handler request_callback))
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{
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PT_BEGIN(&state->pt);
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static uint8_t more;
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static uint32_t res_block;
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static uint8_t block_error;
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state->block_num = 0;
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state->response = NULL;
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||
|
|
state->process = PROCESS_CURRENT();
|
||
|
|
|
||
|
|
more = 0;
|
||
|
|
res_block = 0;
|
||
|
|
block_error = 0;
|
||
|
|
|
||
|
|
do {
|
||
|
|
request->mid = coap_get_mid();
|
||
|
|
if((state->transaction = coap_new_transaction(request->mid, remote_ipaddr,
|
||
|
|
remote_port))) {
|
||
|
|
state->transaction->callback = coap_blocking_request_callback;
|
||
|
|
state->transaction->callback_data = state;
|
||
|
|
|
||
|
|
if(state->block_num > 0) {
|
||
|
|
coap_set_header_block2(request, state->block_num, 0,
|
||
|
|
REST_MAX_CHUNK_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
state->transaction->packet_len = coap_serialize_message(request,
|
||
|
|
state->
|
||
|
|
transaction->
|
||
|
|
packet);
|
||
|
|
|
||
|
|
coap_send_transaction(state->transaction);
|
||
|
|
PRINTF("Requested #%lu (MID %u)\n", state->block_num, request->mid);
|
||
|
|
|
||
|
|
PT_YIELD_UNTIL(&state->pt, ev == PROCESS_EVENT_POLL);
|
||
|
|
|
||
|
|
if(!state->response) {
|
||
|
|
PRINTF("Server not responding\n");
|
||
|
|
PT_EXIT(&state->pt);
|
||
|
|
}
|
||
|
|
|
||
|
|
coap_get_header_block2(state->response, &res_block, &more, NULL, NULL);
|
||
|
|
|
||
|
|
PRINTF("Received #%lu%s (%u bytes)\n", res_block, more ? "+" : "",
|
||
|
|
state->response->payload_len);
|
||
|
|
|
||
|
|
if(res_block == state->block_num) {
|
||
|
|
request_callback(state->response);
|
||
|
|
++(state->block_num);
|
||
|
|
} else {
|
||
|
|
PRINTF("WRONG BLOCK %lu/%lu\n", res_block, state->block_num);
|
||
|
|
++block_error;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
PRINTF("Could not allocate transaction buffer");
|
||
|
|
PT_EXIT(&state->pt);
|
||
|
|
}
|
||
|
|
} while(more && block_error < COAP_MAX_ATTEMPTS);
|
||
|
|
|
||
|
|
PT_END(&state->pt);
|
||
|
|
}
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/*- REST Engine Interface ---------------------------------------------------*/
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
const struct rest_implementation coap_rest_implementation = {
|
||
|
|
"CoAP-18",
|
||
|
|
|
||
|
|
coap_init_engine,
|
||
|
|
coap_set_service_callback,
|
||
|
|
|
||
|
|
coap_get_header_uri_path,
|
||
|
|
coap_get_rest_method,
|
||
|
|
coap_set_status_code,
|
||
|
|
|
||
|
|
coap_get_header_content_format,
|
||
|
|
coap_set_header_content_format,
|
||
|
|
coap_get_header_accept,
|
||
|
|
coap_get_header_size2,
|
||
|
|
coap_set_header_size2,
|
||
|
|
coap_get_header_max_age,
|
||
|
|
coap_set_header_max_age,
|
||
|
|
coap_set_header_etag,
|
||
|
|
coap_get_header_if_match,
|
||
|
|
coap_get_header_if_none_match,
|
||
|
|
coap_get_header_uri_host,
|
||
|
|
coap_set_header_location_path,
|
||
|
|
|
||
|
|
coap_get_payload,
|
||
|
|
coap_set_payload,
|
||
|
|
|
||
|
|
coap_get_header_uri_query,
|
||
|
|
coap_get_query_variable,
|
||
|
|
coap_get_post_variable,
|
||
|
|
|
||
|
|
coap_notify_observers,
|
||
|
|
coap_observe_handler,
|
||
|
|
|
||
|
|
{
|
||
|
|
CONTENT_2_05,
|
||
|
|
CREATED_2_01,
|
||
|
|
CHANGED_2_04,
|
||
|
|
DELETED_2_02,
|
||
|
|
VALID_2_03,
|
||
|
|
BAD_REQUEST_4_00,
|
||
|
|
UNAUTHORIZED_4_01,
|
||
|
|
BAD_OPTION_4_02,
|
||
|
|
FORBIDDEN_4_03,
|
||
|
|
NOT_FOUND_4_04,
|
||
|
|
METHOD_NOT_ALLOWED_4_05,
|
||
|
|
NOT_ACCEPTABLE_4_06,
|
||
|
|
REQUEST_ENTITY_TOO_LARGE_4_13,
|
||
|
|
UNSUPPORTED_MEDIA_TYPE_4_15,
|
||
|
|
INTERNAL_SERVER_ERROR_5_00,
|
||
|
|
NOT_IMPLEMENTED_5_01,
|
||
|
|
BAD_GATEWAY_5_02,
|
||
|
|
SERVICE_UNAVAILABLE_5_03,
|
||
|
|
GATEWAY_TIMEOUT_5_04,
|
||
|
|
PROXYING_NOT_SUPPORTED_5_05},
|
||
|
|
|
||
|
|
{
|
||
|
|
TEXT_PLAIN,
|
||
|
|
TEXT_XML,
|
||
|
|
TEXT_CSV,
|
||
|
|
TEXT_HTML,
|
||
|
|
IMAGE_GIF,
|
||
|
|
IMAGE_JPEG,
|
||
|
|
IMAGE_PNG,
|
||
|
|
IMAGE_TIFF,
|
||
|
|
AUDIO_RAW,
|
||
|
|
VIDEO_RAW,
|
||
|
|
APPLICATION_LINK_FORMAT,
|
||
|
|
APPLICATION_XML,
|
||
|
|
APPLICATION_OCTET_STREAM,
|
||
|
|
APPLICATION_RDF_XML,
|
||
|
|
APPLICATION_SOAP_XML,
|
||
|
|
APPLICATION_ATOM_XML,
|
||
|
|
APPLICATION_XMPP_XML,
|
||
|
|
APPLICATION_EXI,
|
||
|
|
APPLICATION_FASTINFOSET,
|
||
|
|
APPLICATION_SOAP_FASTINFOSET,
|
||
|
|
APPLICATION_JSON,
|
||
|
|
APPLICATION_X_OBIX_BINARY}
|
||
|
|
};
|
||
|
|
/*---------------------------------------------------------------------------*/
|