contiki/apps/er-coap-03/er-coap-03.h
2013-02-13 19:22:21 +01:00

285 lines
9.7 KiB
C

/*
* Copyright (c) 2011, 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
* An implementation of the Constrained Application Protocol (draft 03)
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#ifndef COAP_03_H_
#define COAP_03_H_
#include <stddef.h> /* for size_t */
#include "contiki-net.h"
#include "erbium.h"
#define COAP_DEFAULT_PORT 61616
#ifndef COAP_SERVER_PORT
#define COAP_SERVER_PORT COAP_DEFAULT_PORT
#endif
#define COAP_DEFAULT_MAX_AGE 60
#define COAP_RESPONSE_TIMEOUT 1
#define COAP_MAX_RETRANSMIT 5
#define COAP_HEADER_LEN 4 /* | oc:0xF0 type:0x0C version:0x03 | code | tid:0x00FF | tid:0xFF00 | */
#define COAP_ETAG_LEN 4 /* The maximum number of bytes for the ETag, which is 4 for coap-03 */
#define COAP_TOKEN_LEN 2 /* The maximum number of bytes for the ETag, which is 4 for coap-03 */
#define COAP_HEADER_VERSION_MASK 0xC0
#define COAP_HEADER_VERSION_POSITION 6
#define COAP_HEADER_TYPE_MASK 0x30
#define COAP_HEADER_TYPE_POSITION 4
#define COAP_HEADER_OPTION_COUNT_MASK 0x0F
#define COAP_HEADER_OPTION_COUNT_POSITION 0
#define COAP_HEADER_OPTION_DELTA_MASK 0xF0
#define COAP_HEADER_OPTION_SHORT_LENGTH_MASK 0x0F
/*
* Conservative size limit, as not all options have to be set at the same time.
*/
/* Hdr CoT Age Tag Obs Tok Blo strings */
#define COAP_MAX_HEADER_SIZE (4 + 2 + 5 + 5 + 5 + 5 + 4 + 0)
#define COAP_MAX_PACKET_SIZE (COAP_MAX_HEADER_SIZE + REST_MAX_CHUNK_SIZE)
/* 0/14 48 for IPv6 (28 for IPv4) */
#if COAP_MAX_PACKET_SIZE > (UIP_BUFSIZE - UIP_LLH_LEN - UIP_IPUDPH_LEN)
#error "UIP_CONF_BUFFER_SIZE too small for REST_MAX_CHUNK_SIZE"
#endif
/*
* Maximum number of failed request attempts before action
*/
#ifndef COAP_MAX_ATTEMPTS
#define COAP_MAX_ATTEMPTS 4
#endif /* COAP_MAX_ATTEMPTS */
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#define SET_OPTION(packet, opt) ((packet)->options |= 1<<opt)
#define IS_OPTION(packet, opt) ((packet)->options & 1<<opt)
#ifndef MIN
#define MIN(a, b) ((a) < (b)? (a) : (b))
#endif /* MIN */
/* CoAP message types */
typedef enum {
COAP_TYPE_CON, /* confirmables */
COAP_TYPE_NON, /* non-confirmables */
COAP_TYPE_ACK, /* acknowledgements */
COAP_TYPE_RST /* reset */
} coap_message_type_t;
/* CoAP request method codes */
typedef enum {
COAP_GET = 1,
COAP_POST,
COAP_PUT,
COAP_DELETE
} coap_method_t;
/* CoAP response codes */
typedef enum {
CONTINUE_100 = 40,
OK_200 = 80,
CREATED_201 = 81,
NOT_MODIFIED_304 = 124,
BAD_REQUEST_400 = 160,
NOT_FOUND_404 = 164,
METHOD_NOT_ALLOWED_405 = 165,
UNSUPPORTED_MEDIA_TYPE_415 = 175,
INTERNAL_SERVER_ERROR_500 = 200,
BAD_GATEWAY_502 = 202,
SERVICE_UNAVAILABLE_503 = 203,
GATEWAY_TIMEOUT_504 = 204,
TOKEN_OPTION_REQUIRED = 240,
HOST_REQUIRED = 241,
CRITICAL_OPTION_NOT_SUPPORTED = 242
} coap_status_t;
/* CoAP header options */
typedef enum {
COAP_OPTION_CONTENT_TYPE = 1, /* 1 B */
COAP_OPTION_MAX_AGE = 2, /* 1-4 B */
COAP_OPTION_ETAG = 4, /* 1-4 B */
COAP_OPTION_URI_HOST = 5, /* 1-270 B */
COAP_OPTION_LOCATION_PATH = 6, /* 1-270 B */
COAP_OPTION_URI_PATH = 9, /* 1-270 B */
COAP_OPTION_OBSERVE = 10, /* 0-4 B */
COAP_OPTION_TOKEN = 11, /* 1-2 B */
COAP_OPTION_BLOCK = 13, /* 1-3 B */
COAP_OPTION_NOOP = 14, /* 0 B */
COAP_OPTION_URI_QUERY = 15 /* 1-270 B */
} coap_option_t;
/* CoAP content-types */
typedef enum {
TEXT_PLAIN = 0,
TEXT_XML = 1,
TEXT_CSV = 2,
TEXT_HTML = 3,
IMAGE_GIF = 21,
IMAGE_JPEG = 22,
IMAGE_PNG = 23,
IMAGE_TIFF = 24,
AUDIO_RAW = 25,
VIDEO_RAW = 26,
APPLICATION_LINK_FORMAT = 40,
APPLICATION_XML = 41,
APPLICATION_OCTET_STREAM = 42,
APPLICATION_RDF_XML = 43,
APPLICATION_SOAP_XML = 44,
APPLICATION_ATOM_XML = 45,
APPLICATION_XMPP_XML = 46,
APPLICATION_EXI = 47,
APPLICATION_X_BXML = 48,
APPLICATION_FASTINFOSET = 49,
APPLICATION_SOAP_FASTINFOSET = 50,
APPLICATION_JSON = 51
} coap_content_type_t;
typedef union {
struct { /* 0--14 bytes options */
uint8_t length:4; /* option length in bytes (15 indicates long option format) */
uint8_t delta:4; /* option delta */
/* 0--14 bytes options */
} s;
struct { /* 15-270 bytes options */
uint16_t flag:4; /* must be 15 */
uint16_t delta:4; /* option delta */
uint16_t length:8; /* length - 15 */
} l;
} coap_header_option_t;
typedef struct {
uint8_t *buffer; /* pointer to CoAP header / incoming packet buffer / memory to serialize packet */
uint8_t version;
coap_message_type_t type;
uint8_t option_count;
uint8_t code;
uint16_t tid;
uint16_t options; /* Bitmap to check if option is set */
coap_content_type_t content_type; /* Parse options once and store; allows setting options in random order */
uint32_t max_age;
uint8_t etag_len;
uint8_t etag[COAP_ETAG_LEN];
uint8_t uri_host_len;
const char *uri_host;
uint8_t location_path_len;
const char *location_path;
uint8_t uri_path_len;
const char *uri_path;
uint32_t observe; /* 0-4 bytes for coap-03 */
uint8_t token_len;
uint8_t token[COAP_TOKEN_LEN];
uint32_t block_num;
uint8_t block_more;
uint16_t block_size;
uint32_t block_offset;
uint8_t uri_query_len;
const char *uri_query;
uint16_t payload_len;
uint8_t *payload;
} coap_packet_t;
/*error definitions*/
typedef enum
{
NO_ERROR,
/* Memory errors */
MEMORY_ALLOCATION_ERROR,
MEMORY_BOUNDARY_EXCEEDED,
/* CoAP errors */
UNKNOWN_CRITICAL_OPTION,
PACKET_SERIALIZATION_ERROR
} error_t;
void coap_init_connection(uint16_t port);
uint16_t coap_get_tid(void);
void coap_send_message(uip_ipaddr_t *addr, uint16_t port, const uint8_t *data, uint16_t length);
void coap_init_message(void *packet, coap_message_type_t type, uint8_t code, uint16_t tid);
int coap_serialize_message(void *packet, uint8_t *buffer);
error_t coap_parse_message(void *request, uint8_t *data, uint16_t data_len);
coap_method_t coap_get_method(void *packet);
void coap_set_status(void *packet, unsigned int code);
int coap_get_query_variable(void *packet, const char *name, const char **output);
int coap_get_post_variable(void *packet, const char *name, const char **output);
unsigned int coap_get_header_content_type(void *packet);
int coap_set_header_content_type(void *packet, unsigned int content_type);
int coap_get_header_max_age(void *packet, uint32_t *age);
int coap_set_header_max_age(void *packet, uint32_t age);
int coap_get_header_etag(void *packet, const uint8_t **etag);
int coap_set_header_etag(void *packet, const uint8_t *etag, size_t etag_len);
int coap_get_header_uri_host(void *packet, const char **host); /*CAUTION in-place string might not be 0-terminated */
int coap_set_header_uri_host(void *packet, const char *host);
int coap_get_header_location(void *packet, const char **uri); /*CAUTION in-place string might not be 0-terminated */
int coap_set_header_location(void *packet, const char *uri);
int coap_get_header_uri_path(void *packet, const char **uri); /*CAUTION in-place string might not be 0-terminated */
int coap_set_header_uri_path(void *packet, const char *uri);
int coap_get_header_observe(void *packet, uint32_t *observe);
int coap_set_header_observe(void *packet, uint32_t observe);
int coap_get_header_token(void *packet, const uint8_t **token);
int coap_set_header_token(void *packet, const uint8_t *token, size_t token_len);
int coap_get_header_block(void *packet, uint32_t *num, uint8_t *more, uint16_t *size, uint32_t *offset);
int coap_set_header_block(void *packet, uint32_t num, uint8_t more, uint16_t size);
int coap_get_header_uri_query(void *packet, const char **query); /*CAUTION in-place string might not be 0-terminated */
int coap_set_header_uri_query(void *packet, const char *query);
int coap_get_payload(void *packet, const uint8_t **payload);
int coap_set_payload(void *packet, const void *payload, size_t length);
#endif /* COAP_03_H_ */