contiki/apps/er-coap/er-coap.h
2014-05-15 20:29:05 +02:00

268 lines
11 KiB
C

/*
* 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
* An implementation of the Constrained Application Protocol (RFC).
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#ifndef ER_COAP_H_
#define ER_COAP_H_
#include <stddef.h> /* for size_t */
#include "contiki-net.h"
#include "er-coap-constants.h"
#include "er-coap-conf.h"
/* sanity check for configured values */
#define COAP_MAX_PACKET_SIZE (COAP_MAX_HEADER_SIZE + REST_MAX_CHUNK_SIZE)
#if COAP_MAX_PACKET_SIZE > (UIP_BUFSIZE - UIP_IPH_LEN - UIP_UDPH_LEN)
#error "UIP_CONF_BUFFER_SIZE too small for REST_MAX_CHUNK_SIZE"
#endif
/* use Erbium CoAP for the REST Engine. Must come before include of rest-engine.h. */
#define REST coap_rest_implementation
#include "rest-engine.h"
/* REST_MAX_CHUNK_SIZE can be different from 2^x so we need to get next lower 2^x for COAP_MAX_BLOCK_SIZE */
#ifndef COAP_MAX_BLOCK_SIZE
#define COAP_MAX_BLOCK_SIZE (REST_MAX_CHUNK_SIZE < 32 ? 16 : \
(REST_MAX_CHUNK_SIZE < 64 ? 32 : \
(REST_MAX_CHUNK_SIZE < 128 ? 64 : \
(REST_MAX_CHUNK_SIZE < 256 ? 128 : \
(REST_MAX_CHUNK_SIZE < 512 ? 256 : \
(REST_MAX_CHUNK_SIZE < 1024 ? 512 : \
(REST_MAX_CHUNK_SIZE < 2048 ? 1024 : 2048)))))))
#endif /* COAP_MAX_BLOCK_SIZE */
/* direct access into the buffer */
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#if UIP_CONF_IPV6
#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#else
#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN])
#endif
/* bitmap for set options */
enum { OPTION_MAP_SIZE = sizeof(uint8_t) * 8 };
#define SET_OPTION(packet, opt) ((packet)->options[opt / OPTION_MAP_SIZE] |= 1 << (opt % OPTION_MAP_SIZE))
#define IS_OPTION(packet, opt) ((packet)->options[opt / OPTION_MAP_SIZE] & (1 << (opt % OPTION_MAP_SIZE)))
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif /* MIN */
/* parsed message struct */
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 code;
uint16_t mid;
uint8_t token_len;
uint8_t token[COAP_TOKEN_LEN];
uint8_t options[COAP_OPTION_SIZE1 / OPTION_MAP_SIZE + 1]; /* bitmap to check if option is set */
coap_content_format_t content_format; /* 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];
size_t proxy_uri_len;
const char *proxy_uri;
size_t proxy_scheme_len;
const char *proxy_scheme;
size_t uri_host_len;
const char *uri_host;
size_t location_path_len;
const char *location_path;
uint16_t uri_port;
size_t location_query_len;
const char *location_query;
size_t uri_path_len;
const char *uri_path;
int32_t observe;
coap_content_format_t accept;
uint8_t if_match_len;
uint8_t if_match[COAP_ETAG_LEN];
uint32_t block2_num;
uint8_t block2_more;
uint16_t block2_size;
uint32_t block2_offset;
uint32_t block1_num;
uint8_t block1_more;
uint16_t block1_size;
uint32_t block1_offset;
uint32_t size2;
uint32_t size1;
size_t uri_query_len;
const char *uri_query;
uint8_t if_none_match;
uint16_t payload_len;
uint8_t *payload;
} coap_packet_t;
/* option format serialization */
#define COAP_SERIALIZE_INT_OPTION(number, field, text) \
if(IS_OPTION(coap_pkt, number)) { \
PRINTF(text " [%u]\n", coap_pkt->field); \
option += coap_serialize_int_option(number, current_number, option, coap_pkt->field); \
current_number = number; \
}
#define COAP_SERIALIZE_BYTE_OPTION(number, field, text) \
if(IS_OPTION(coap_pkt, number)) { \
PRINTF(text " %u [0x%02X%02X%02X%02X%02X%02X%02X%02X]\n", coap_pkt->field##_len, \
coap_pkt->field[0], \
coap_pkt->field[1], \
coap_pkt->field[2], \
coap_pkt->field[3], \
coap_pkt->field[4], \
coap_pkt->field[5], \
coap_pkt->field[6], \
coap_pkt->field[7] \
); /* FIXME always prints 8 bytes */ \
option += coap_serialize_array_option(number, current_number, option, coap_pkt->field, coap_pkt->field##_len, '\0'); \
current_number = number; \
}
#define COAP_SERIALIZE_STRING_OPTION(number, field, splitter, text) \
if(IS_OPTION(coap_pkt, number)) { \
PRINTF(text " [%.*s]\n", coap_pkt->field##_len, coap_pkt->field); \
option += coap_serialize_array_option(number, current_number, option, (uint8_t *)coap_pkt->field, coap_pkt->field##_len, splitter); \
current_number = number; \
}
#define COAP_SERIALIZE_BLOCK_OPTION(number, field, text) \
if(IS_OPTION(coap_pkt, number)) \
{ \
PRINTF(text " [%lu%s (%u B/blk)]\n", coap_pkt->field##_num, coap_pkt->field##_more ? "+" : "", coap_pkt->field##_size); \
uint32_t block = coap_pkt->field##_num << 4; \
if(coap_pkt->field##_more) { block |= 0x8; } \
block |= 0xF & coap_log_2(coap_pkt->field##_size / 16); \
PRINTF(text " encoded: 0x%lX\n", block); \
option += coap_serialize_int_option(number, current_number, option, block); \
current_number = number; \
}
/* to store error code and human-readable payload */
extern coap_status_t erbium_status_code;
extern char *coap_error_message;
void coap_init_connection(uint16_t port);
uint16_t coap_get_mid(void);
void coap_init_message(void *packet, coap_message_type_t type, uint8_t code,
uint16_t mid);
size_t coap_serialize_message(void *packet, uint8_t *buffer);
void coap_send_message(uip_ipaddr_t *addr, uint16_t port, uint8_t *data,
uint16_t length);
coap_status_t coap_parse_message(void *request, uint8_t *data,
uint16_t data_len);
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);
/*---------------------------------------------------------------------------*/
int coap_set_status_code(void *packet, unsigned int code);
int coap_set_token(void *packet, const uint8_t *token, size_t token_len);
int coap_get_header_content_format(void *packet, unsigned int *format);
int coap_set_header_content_format(void *packet, unsigned int format);
int coap_get_header_accept(void *packet, unsigned int *accept);
int coap_set_header_accept(void *packet, unsigned int accept);
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_if_match(void *packet, const uint8_t **etag);
int coap_set_header_if_match(void *packet, const uint8_t *etag,
size_t etag_len);
int coap_get_header_if_none_match(void *packet);
int coap_set_header_if_none_match(void *packet);
int coap_get_header_proxy_uri(void *packet, const char **uri); /* in-place string might not be 0-terminated. */
int coap_set_header_proxy_uri(void *packet, const char *uri);
int coap_get_header_proxy_scheme(void *packet, const char **scheme); /* in-place string might not be 0-terminated. */
int coap_set_header_proxy_scheme(void *packet, const char *scheme);
int coap_get_header_uri_host(void *packet, const char **host); /* in-place string might not be 0-terminated. */
int coap_set_header_uri_host(void *packet, const char *host);
int coap_get_header_uri_path(void *packet, const char **path); /* in-place string might not be 0-terminated. */
int coap_set_header_uri_path(void *packet, const char *path);
int coap_get_header_uri_query(void *packet, const char **query); /* in-place string might not be 0-terminated. */
int coap_set_header_uri_query(void *packet, const char *query);
int coap_get_header_location_path(void *packet, const char **path); /* in-place string might not be 0-terminated. */
int coap_set_header_location_path(void *packet, const char *path); /* also splits optional query into Location-Query option. */
int coap_get_header_location_query(void *packet, const char **query); /* in-place string might not be 0-terminated. */
int coap_set_header_location_query(void *packet, const char *query);
int coap_get_header_observe(void *packet, uint32_t *observe);
int coap_set_header_observe(void *packet, uint32_t observe);
int coap_get_header_block2(void *packet, uint32_t *num, uint8_t *more,
uint16_t *size, uint32_t *offset);
int coap_set_header_block2(void *packet, uint32_t num, uint8_t more,
uint16_t size);
int coap_get_header_block1(void *packet, uint32_t *num, uint8_t *more,
uint16_t *size, uint32_t *offset);
int coap_set_header_block1(void *packet, uint32_t num, uint8_t more,
uint16_t size);
int coap_get_header_size2(void *packet, uint32_t *size);
int coap_set_header_size2(void *packet, uint32_t size);
int coap_get_header_size1(void *packet, uint32_t *size);
int coap_set_header_size1(void *packet, uint32_t size);
int coap_get_payload(void *packet, const uint8_t **payload);
int coap_set_payload(void *packet, const void *payload, size_t length);
#endif /* ER_COAP_H_ */