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285 lines
9.7 KiB
C
285 lines
9.7 KiB
C
/*
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* Copyright (c) 2011, 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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* An implementation of the Constrained Application Protocol (draft 03)
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#ifndef COAP_03_H_
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#define COAP_03_H_
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#include <stddef.h> /* for size_t */
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#include "contiki-net.h"
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#include "erbium.h"
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#define COAP_DEFAULT_PORT 61616
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#ifndef COAP_SERVER_PORT
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#define COAP_SERVER_PORT COAP_DEFAULT_PORT
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#endif
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#define COAP_DEFAULT_MAX_AGE 60
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#define COAP_RESPONSE_TIMEOUT 1
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#define COAP_MAX_RETRANSMIT 5
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#define COAP_HEADER_LEN 4 /* | oc:0xF0 type:0x0C version:0x03 | code | tid:0x00FF | tid:0xFF00 | */
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#define COAP_ETAG_LEN 4 /* The maximum number of bytes for the ETag, which is 4 for coap-03 */
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#define COAP_TOKEN_LEN 2 /* The maximum number of bytes for the ETag, which is 4 for coap-03 */
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#define COAP_HEADER_VERSION_MASK 0xC0
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#define COAP_HEADER_VERSION_POSITION 6
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#define COAP_HEADER_TYPE_MASK 0x30
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#define COAP_HEADER_TYPE_POSITION 4
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#define COAP_HEADER_OPTION_COUNT_MASK 0x0F
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#define COAP_HEADER_OPTION_COUNT_POSITION 0
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#define COAP_HEADER_OPTION_DELTA_MASK 0xF0
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#define COAP_HEADER_OPTION_SHORT_LENGTH_MASK 0x0F
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/*
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* Conservative size limit, as not all options have to be set at the same time.
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*/
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/* Hdr CoT Age Tag Obs Tok Blo strings */
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#define COAP_MAX_HEADER_SIZE (4 + 2 + 5 + 5 + 5 + 5 + 4 + 0)
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#define COAP_MAX_PACKET_SIZE (COAP_MAX_HEADER_SIZE + REST_MAX_CHUNK_SIZE)
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/* 0/14 48 for IPv6 (28 for IPv4) */
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#if COAP_MAX_PACKET_SIZE > (UIP_BUFSIZE - UIP_LLH_LEN - UIP_IPUDPH_LEN)
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#error "UIP_CONF_BUFFER_SIZE too small for REST_MAX_CHUNK_SIZE"
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#endif
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/*
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* Maximum number of failed request attempts before action
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*/
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#ifndef COAP_MAX_ATTEMPTS
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#define COAP_MAX_ATTEMPTS 4
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#endif /* COAP_MAX_ATTEMPTS */
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define SET_OPTION(packet, opt) ((packet)->options |= 1<<opt)
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#define IS_OPTION(packet, opt) ((packet)->options & 1<<opt)
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#ifndef MIN
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#define MIN(a, b) ((a) < (b)? (a) : (b))
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#endif /* MIN */
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/* CoAP message types */
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typedef enum {
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COAP_TYPE_CON, /* confirmables */
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COAP_TYPE_NON, /* non-confirmables */
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COAP_TYPE_ACK, /* acknowledgements */
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COAP_TYPE_RST /* reset */
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} coap_message_type_t;
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/* CoAP request method codes */
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typedef enum {
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COAP_GET = 1,
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COAP_POST,
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COAP_PUT,
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COAP_DELETE
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} coap_method_t;
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/* CoAP response codes */
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typedef enum {
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CONTINUE_100 = 40,
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OK_200 = 80,
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CREATED_201 = 81,
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NOT_MODIFIED_304 = 124,
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BAD_REQUEST_400 = 160,
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NOT_FOUND_404 = 164,
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METHOD_NOT_ALLOWED_405 = 165,
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UNSUPPORTED_MADIA_TYPE_415 = 175,
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INTERNAL_SERVER_ERROR_500 = 200,
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BAD_GATEWAY_502 = 202,
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SERVICE_UNAVAILABLE_503 = 203,
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GATEWAY_TIMEOUT_504 = 204,
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TOKEN_OPTION_REQUIRED = 240,
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HOST_REQUIRED = 241,
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CRITICAL_OPTION_NOT_SUPPORTED = 242
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} coap_status_t;
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/* CoAP header options */
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typedef enum {
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COAP_OPTION_CONTENT_TYPE = 1, /* 1 B */
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COAP_OPTION_MAX_AGE = 2, /* 1-4 B */
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COAP_OPTION_ETAG = 4, /* 1-4 B */
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COAP_OPTION_URI_HOST = 5, /* 1-270 B */
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COAP_OPTION_LOCATION_PATH = 6, /* 1-270 B */
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COAP_OPTION_URI_PATH = 9, /* 1-270 B */
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COAP_OPTION_OBSERVE = 10, /* 0-4 B */
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COAP_OPTION_TOKEN = 11, /* 1-2 B */
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COAP_OPTION_BLOCK = 13, /* 1-3 B */
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COAP_OPTION_NOOP = 14, /* 0 B */
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COAP_OPTION_URI_QUERY = 15 /* 1-270 B */
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} coap_option_t;
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/* CoAP content-types */
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typedef enum {
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TEXT_PLAIN = 0,
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TEXT_XML = 1,
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TEXT_CSV = 2,
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TEXT_HTML = 3,
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IMAGE_GIF = 21,
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IMAGE_JPEG = 22,
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IMAGE_PNG = 23,
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IMAGE_TIFF = 24,
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AUDIO_RAW = 25,
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VIDEO_RAW = 26,
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APPLICATION_LINK_FORMAT = 40,
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APPLICATION_XML = 41,
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APPLICATION_OCTET_STREAM = 42,
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APPLICATION_RDF_XML = 43,
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APPLICATION_SOAP_XML = 44,
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APPLICATION_ATOM_XML = 45,
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APPLICATION_XMPP_XML = 46,
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APPLICATION_EXI = 47,
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APPLICATION_X_BXML = 48,
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APPLICATION_FASTINFOSET = 49,
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APPLICATION_SOAP_FASTINFOSET = 50,
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APPLICATION_JSON = 51
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} coap_content_type_t;
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typedef union {
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struct { /* 0--14 bytes options */
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uint8_t length:4; /* option length in bytes (15 indicates long option format) */
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uint8_t delta:4; /* option delta */
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/* 0--14 bytes options */
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} s;
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struct { /* 15-270 bytes options */
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uint16_t flag:4; /* must be 15 */
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uint16_t delta:4; /* option delta */
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uint16_t length:8; /* length - 15 */
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} l;
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} coap_header_option_t;
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typedef struct {
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uint8_t *buffer; /* pointer to CoAP header / incoming packet buffer / memory to serialize packet */
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uint8_t version;
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coap_message_type_t type;
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uint8_t option_count;
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uint8_t code;
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uint16_t tid;
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uint16_t options; /* Bitmap to check if option is set */
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coap_content_type_t content_type; /* Parse options once and store; allows setting options in random order */
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uint32_t max_age;
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uint8_t etag_len;
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uint8_t etag[COAP_ETAG_LEN];
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uint8_t uri_host_len;
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const char *uri_host;
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uint8_t location_path_len;
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const char *location_path;
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uint8_t uri_path_len;
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const char *uri_path;
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uint32_t observe; /* 0-4 bytes for coap-03 */
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uint8_t token_len;
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uint8_t token[COAP_TOKEN_LEN];
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uint32_t block_num;
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uint8_t block_more;
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uint16_t block_size;
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uint32_t block_offset;
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uint8_t uri_query_len;
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const char *uri_query;
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uint16_t payload_len;
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uint8_t *payload;
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} coap_packet_t;
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/*error definitions*/
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typedef enum
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{
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NO_ERROR,
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/* Memory errors */
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MEMORY_ALLOCATION_ERROR,
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MEMORY_BOUNDARY_EXCEEDED,
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/* CoAP errors */
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UNKNOWN_CRITICAL_OPTION,
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PACKET_SERIALIZATION_ERROR
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} error_t;
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void coap_init_connection(uint16_t port);
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uint16_t coap_get_tid(void);
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void coap_send_message(uip_ipaddr_t *addr, uint16_t port, const uint8_t *data, uint16_t length);
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void coap_init_message(void *packet, coap_message_type_t type, uint8_t code, uint16_t tid);
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int coap_serialize_message(void *packet, uint8_t *buffer);
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error_t coap_parse_message(void *request, uint8_t *data, uint16_t data_len);
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coap_method_t coap_get_method(void *packet);
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void coap_set_status(void *packet, unsigned int code);
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int coap_get_query_variable(void *packet, const char *name, const char **output);
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int coap_get_post_variable(void *packet, const char *name, const char **output);
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unsigned int coap_get_header_content_type(void *packet);
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int coap_set_header_content_type(void *packet, unsigned int content_type);
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int coap_get_header_max_age(void *packet, uint32_t *age);
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int coap_set_header_max_age(void *packet, uint32_t age);
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int coap_get_header_etag(void *packet, const uint8_t **etag);
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int coap_set_header_etag(void *packet, const uint8_t *etag, size_t etag_len);
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int coap_get_header_uri_host(void *packet, const char **host); /*CAUTION in-place string might not be 0-terminated */
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int coap_set_header_uri_host(void *packet, const char *host);
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int coap_get_header_location(void *packet, const char **uri); /*CAUTION in-place string might not be 0-terminated */
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int coap_set_header_location(void *packet, const char *uri);
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int coap_get_header_uri_path(void *packet, const char **uri); /*CAUTION in-place string might not be 0-terminated */
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int coap_set_header_uri_path(void *packet, const char *uri);
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int coap_get_header_observe(void *packet, uint32_t *observe);
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int coap_set_header_observe(void *packet, uint32_t observe);
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int coap_get_header_token(void *packet, const uint8_t **token);
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int coap_set_header_token(void *packet, const uint8_t *token, size_t token_len);
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int coap_get_header_block(void *packet, uint32_t *num, uint8_t *more, uint16_t *size, uint32_t *offset);
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int coap_set_header_block(void *packet, uint32_t num, uint8_t more, uint16_t size);
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int coap_get_header_uri_query(void *packet, const char **query); /*CAUTION in-place string might not be 0-terminated */
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int coap_set_header_uri_query(void *packet, const char *query);
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int coap_get_payload(void *packet, const uint8_t **payload);
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int coap_set_payload(void *packet, uint8_t *payload, size_t length);
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#endif /* COAP_03_H_ */
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