204 lines
6.7 KiB
C
204 lines
6.7 KiB
C
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#ifndef COAP_H
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#define COAP_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stddef.h>
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#include "lauxlib.h"
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#define MAXOPT 16
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#define MAX_MESSAGE_SIZE 1152
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#define MAX_PAYLOAD_SIZE 1024
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#define MAX_REQUEST_SIZE 576
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#define MAX_REQ_SCRATCH_SIZE 60
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#define COAP_RESPONSE_CLASS(C) (((C) >> 5) & 0xFF)
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//http://tools.ietf.org/html/rfc7252#section-3
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typedef struct
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{
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uint8_t ver; /* CoAP version number */
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uint8_t t; /* CoAP Message Type */
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uint8_t tkl; /* Token length: indicates length of the Token field */
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uint8_t code; /* CoAP status code. Can be request (0.xx), success reponse (2.xx),
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* client error response (4.xx), or rever error response (5.xx)
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* For possible values, see http://tools.ietf.org/html/rfc7252#section-12.1 */
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uint8_t id[2];
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} coap_header_t;
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typedef struct
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{
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const uint8_t *p;
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size_t len;
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} coap_buffer_t;
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typedef struct
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{
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uint8_t *p;
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size_t len;
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} coap_rw_buffer_t;
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typedef struct
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{
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uint8_t num; /* Option number. See http://tools.ietf.org/html/rfc7252#section-5.10 */
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coap_buffer_t buf; /* Option value */
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} coap_option_t;
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typedef struct
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{
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coap_header_t hdr; /* Header of the packet */
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coap_buffer_t tok; /* Token value, size as specified by hdr.tkl */
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uint8_t numopts; /* Number of options */
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coap_option_t opts[MAXOPT]; /* Options of the packet. For possible entries see
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* http://tools.ietf.org/html/rfc7252#section-5.10 */
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coap_buffer_t payload; /* Payload carried by the packet */
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coap_rw_buffer_t content; // content->p = malloc(...) , and free it when done.
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} coap_packet_t;
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/////////////////////////////////////////
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//http://tools.ietf.org/html/rfc7252#section-12.2
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typedef enum
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{
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COAP_OPTION_IF_MATCH = 1,
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COAP_OPTION_URI_HOST = 3,
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COAP_OPTION_ETAG = 4,
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COAP_OPTION_IF_NONE_MATCH = 5,
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COAP_OPTION_OBSERVE = 6,
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COAP_OPTION_URI_PORT = 7,
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COAP_OPTION_LOCATION_PATH = 8,
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COAP_OPTION_URI_PATH = 11,
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COAP_OPTION_CONTENT_FORMAT = 12,
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COAP_OPTION_MAX_AGE = 14,
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COAP_OPTION_URI_QUERY = 15,
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COAP_OPTION_ACCEPT = 17,
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COAP_OPTION_LOCATION_QUERY = 20,
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COAP_OPTION_PROXY_URI = 35,
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COAP_OPTION_PROXY_SCHEME = 39
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} coap_option_num_t;
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//http://tools.ietf.org/html/rfc7252#section-12.1.1
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typedef enum
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{
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COAP_METHOD_GET = 1,
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COAP_METHOD_POST = 2,
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COAP_METHOD_PUT = 3,
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COAP_METHOD_DELETE = 4
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} coap_method_t;
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//http://tools.ietf.org/html/rfc7252#section-12.1.1
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typedef enum
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{
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COAP_TYPE_CON = 0,
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COAP_TYPE_NONCON = 1,
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COAP_TYPE_ACK = 2,
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COAP_TYPE_RESET = 3
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} coap_msgtype_t;
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//http://tools.ietf.org/html/rfc7252#section-5.2
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//http://tools.ietf.org/html/rfc7252#section-12.1.2
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#define MAKE_RSPCODE(clas, det) ((clas << 5) | (det))
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typedef enum
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{
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COAP_RSPCODE_CONTENT = MAKE_RSPCODE(2, 5),
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COAP_RSPCODE_NOT_FOUND = MAKE_RSPCODE(4, 4),
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COAP_RSPCODE_BAD_REQUEST = MAKE_RSPCODE(4, 0),
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COAP_RSPCODE_CHANGED = MAKE_RSPCODE(2, 4)
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} coap_responsecode_t;
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//http://tools.ietf.org/html/rfc7252#section-12.3
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typedef enum
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{
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COAP_CONTENTTYPE_NONE = -1, // bodge to allow us not to send option block
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COAP_CONTENTTYPE_TEXT_PLAIN = 0,
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COAP_CONTENTTYPE_APPLICATION_LINKFORMAT = 40,
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COAP_CONTENTTYPE_APPLICATION_XML = 41,
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COAP_CONTENTTYPE_APPLICATION_OCTET_STREAM = 42,
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COAP_CONTENTTYPE_APPLICATION_EXI = 47,
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COAP_CONTENTTYPE_APPLICATION_JSON = 50,
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} coap_content_type_t;
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///////////////////////
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typedef enum
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{
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COAP_ERR_NONE = 0,
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COAP_ERR_HEADER_TOO_SHORT = 1,
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COAP_ERR_VERSION_NOT_1 = 2,
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COAP_ERR_TOKEN_TOO_SHORT = 3,
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COAP_ERR_OPTION_TOO_SHORT_FOR_HEADER = 4,
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COAP_ERR_OPTION_TOO_SHORT = 5,
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COAP_ERR_OPTION_OVERRUNS_PACKET = 6,
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COAP_ERR_OPTION_TOO_BIG = 7,
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COAP_ERR_OPTION_LEN_INVALID = 8,
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COAP_ERR_BUFFER_TOO_SMALL = 9,
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COAP_ERR_UNSUPPORTED = 10,
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COAP_ERR_OPTION_DELTA_INVALID = 11,
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} coap_error_t;
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///////////////////////
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typedef struct coap_endpoint_t coap_endpoint_t;
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typedef int (*coap_endpoint_func)(const coap_endpoint_t *ep, coap_rw_buffer_t *scratch, const coap_packet_t *inpkt, coap_packet_t *outpkt, uint8_t id_hi, uint8_t id_lo);
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#define MAX_SEGMENTS 3 // 2 = /foo/bar, 3 = /foo/bar/baz
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#define MAX_SEGMENTS_SIZE 16
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typedef struct
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{
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int count;
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const char *elems[MAX_SEGMENTS];
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} coap_endpoint_path_t;
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typedef struct coap_luser_entry coap_luser_entry;
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struct coap_luser_entry{
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// int ref;
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// char name[MAX_SEGMENTS_SIZE+1]; // +1 for string '\0'
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const char *name;
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coap_luser_entry *next;
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int content_type;
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};
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struct coap_endpoint_t{
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coap_method_t method; /* (i.e. POST, PUT or GET) */
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coap_endpoint_func handler; /* callback function which handles this
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* type of endpoint (and calls
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* coap_make_response() at some point) */
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const coap_endpoint_path_t *path; /* path towards a resource (i.e. foo/bar/) */
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const char *core_attr; /* the 'ct' attribute, as defined in RFC7252, section 7.2.1.:
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* "The Content-Format code "ct" attribute
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* provides a hint about the
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* Content-Formats this resource returns."
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* (Section 12.3. lists possible ct values.) */
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coap_luser_entry *user_entry;
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};
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///////////////////////
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void coap_dumpPacket(coap_packet_t *pkt);
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int coap_parse(coap_packet_t *pkt, const uint8_t *buf, size_t buflen);
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int coap_buffer_to_string(char *strbuf, size_t strbuflen, const coap_buffer_t *buf);
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const coap_option_t *coap_findOptions(const coap_packet_t *pkt, uint8_t num, uint8_t *count);
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int coap_build(uint8_t *buf, size_t *buflen, const coap_packet_t *pkt);
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void coap_dump(const uint8_t *buf, size_t buflen, bool bare);
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int coap_make_response(coap_rw_buffer_t *scratch, coap_packet_t *pkt, const uint8_t *content, size_t content_len, uint8_t msgid_hi, uint8_t msgid_lo, const coap_buffer_t* tok, coap_responsecode_t rspcode, coap_content_type_t content_type);
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int coap_handle_req(coap_rw_buffer_t *scratch, const coap_packet_t *inpkt, coap_packet_t *outpkt);
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void coap_option_nibble(uint32_t value, uint8_t *nibble);
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void coap_setup(void);
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void endpoint_setup(void);
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int coap_buildOptionHeader(uint32_t optDelta, size_t length, uint8_t *buf, size_t buflen);
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int check_token(coap_packet_t *pkt);
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#include "uri.h"
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int coap_make_request(coap_rw_buffer_t *scratch, coap_packet_t *pkt, coap_msgtype_t t, coap_method_t m, coap_uri_t *uri, const uint8_t *payload, size_t payload_len);
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#ifdef __cplusplus
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}
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#endif
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#endif
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