1/* 2 * coap_pdu.h -- CoAP message structure 3 * 4 * Copyright (C) 2010-2014 Olaf Bergmann <bergmann@tzi.org> 5 * Copyright (C) 2021-2023 Jon Shallow <supjps-libcoap@jpshallow.com> 6 * 7 * SPDX-License-Identifier: BSD-2-Clause 8 * 9 * This file is part of the CoAP library libcoap. Please see README for terms 10 * of use. 11 */ 12 13/** 14 * @file coap_pdu.h 15 * @brief Pre-defined constants that reflect defaults for CoAP 16 */ 17 18#ifndef COAP_PDU_H_ 19#define COAP_PDU_H_ 20 21#include "coap_option.h" 22#include "coap_uri.h" 23 24#ifdef WITH_LWIP 25#include <lwip/pbuf.h> 26#endif 27 28#include <stdint.h> 29 30/** 31 * @ingroup application_api 32 * @defgroup pdu PDU 33 * API for PDUs 34 * @{ 35 */ 36 37 #ifndef COAP_USER_DEFAULT_PORT 38 #define COAP_USER_DEFAULT_PORT 5683 /* CoAP default UDP/TCP port */ 39 #endif 40 #define COAP_DEFAULT_PORT COAP_USER_DEFAULT_PORT 41 42#define COAPS_DEFAULT_PORT 5684 /* CoAP default UDP/TCP port for secure transmission */ 43#define COAP_DEFAULT_MAX_AGE 60 /* default maximum object lifetime in seconds */ 44#ifndef COAP_DEFAULT_MTU 45#define COAP_DEFAULT_MTU 1152 46#endif /* COAP_DEFAULT_MTU */ 47 48#define COAP_BERT_BASE 1152 49 50#ifndef COAP_DEFAULT_HOP_LIMIT 51#define COAP_DEFAULT_HOP_LIMIT 16 52#endif /* COAP_DEFAULT_HOP_LIMIT */ 53 54#define COAP_DEFAULT_SCHEME "coap" /* the default scheme for CoAP URIs */ 55 56/** well-known resources URI */ 57#define COAP_DEFAULT_URI_WELLKNOWN ".well-known/core" 58 59/* Extended Token constants */ 60#define COAP_TOKEN_DEFAULT_MAX 8 61#define COAP_TOKEN_EXT_MAX 65804 /* 13 + 256 + 65535 */ 62 63/* CoAP message types */ 64 65/** 66 * CoAP PDU message type definitions 67 */ 68typedef enum coap_pdu_type_t { 69 COAP_MESSAGE_CON, /* 0 confirmable message (requires ACK/RST) */ 70 COAP_MESSAGE_NON, /* 1 non-confirmable message (one-shot message) */ 71 COAP_MESSAGE_ACK, /* 2 used to acknowledge confirmable messages */ 72 COAP_MESSAGE_RST /* 3 indicates error in received messages */ 73} coap_pdu_type_t; 74 75/** 76 * CoAP PDU Request methods 77 */ 78typedef enum coap_request_t { 79 COAP_REQUEST_GET = 1, 80 COAP_REQUEST_POST, /* 2 */ 81 COAP_REQUEST_PUT, /* 3 */ 82 COAP_REQUEST_DELETE, /* 4 */ 83 COAP_REQUEST_FETCH, /* 5 RFC 8132 */ 84 COAP_REQUEST_PATCH, /* 6 RFC 8132 */ 85 COAP_REQUEST_IPATCH, /* 7 RFC 8132 */ 86} coap_request_t; 87 88/* 89 * CoAP option numbers (be sure to update coap_option_check_critical() and 90 * coap_add_option() when adding options 91 */ 92 93/* 94 * The C, U, and N flags indicate the properties 95 * Critical, Unsafe, and NoCacheKey, respectively. 96 * If U is set, then N has no meaning as per 97 * https://rfc-editor.org/rfc/rfc7252#section-5.10 98 * and is set to a -. 99 * 100 * Separately, R is for the options that can be repeated 101 * 102 * The least significant byte of the option is set as followed 103 * as per https://rfc-editor.org/rfc/rfc7252#section-5.4.6 104 * 105 * 0 1 2 3 4 5 6 7 106 * --+---+---+---+---+---+---+---+ 107 * | NoCacheKey| U | C | 108 * --+---+---+---+---+---+---+---+ 109 * 110 * https://rfc-editor.org/rfc/rfc8613#section-4 goes on to define E, I and U 111 * properties Encrypted and Integrity Protected, Integrity Protected Only, and 112 * Unprotected respectively. Integrity Protected Only is not currently used. 113 * 114 * An Option is tagged with CUNREIU with any of the letters replaced with _ if 115 * not set, or - for N if U is set (see above) for aiding understanding of the 116 * Option. 117 */ 118 119#define COAP_OPTION_IF_MATCH 1 /* C__RE__, opaque, 0-8 B, RFC7252 */ 120#define COAP_OPTION_URI_HOST 3 /* CU-___U, String, 1-255 B, RFC7252 */ 121#define COAP_OPTION_ETAG 4 /* ___RE__, opaque, 1-8 B, RFC7252 */ 122#define COAP_OPTION_IF_NONE_MATCH 5 /* C___E__, empty, 0 B, RFC7252 */ 123#define COAP_OPTION_OBSERVE 6 /* _U-_E_U, empty/uint,0/0-3 B, RFC7641 */ 124#define COAP_OPTION_URI_PORT 7 /* CU-___U, uint, 0-2 B, RFC7252 */ 125#define COAP_OPTION_LOCATION_PATH 8 /* ___RE__, String, 0-255 B, RFC7252 */ 126#define COAP_OPTION_OSCORE 9 /* C_____U, *, 0-255 B, RFC8613 */ 127#define COAP_OPTION_URI_PATH 11 /* CU-RE__, String, 0-255 B, RFC7252 */ 128#define COAP_OPTION_CONTENT_FORMAT 12 /* ____E__, uint, 0-2 B, RFC7252 */ 129#define COAP_OPTION_CONTENT_TYPE COAP_OPTION_CONTENT_FORMAT 130/* COAP_OPTION_MAXAGE default 60 seconds if not set */ 131#define COAP_OPTION_MAXAGE 14 /* _U-_E_U, uint, 0-4 B, RFC7252 */ 132#define COAP_OPTION_URI_QUERY 15 /* CU-RE__, String, 1-255 B, RFC7252 */ 133#define COAP_OPTION_HOP_LIMIT 16 /* ______U, uint, 1 B, RFC8768 */ 134#define COAP_OPTION_ACCEPT 17 /* C___E__, uint, 0-2 B, RFC7252 */ 135#define COAP_OPTION_Q_BLOCK1 19 /* CU__E_U, uint, 0-3 B, RFC9177 */ 136#define COAP_OPTION_LOCATION_QUERY 20 /* ___RE__, String, 0-255 B, RFC7252 */ 137#define COAP_OPTION_BLOCK2 23 /* CU-_E_U, uint, 0-3 B, RFC7959 */ 138#define COAP_OPTION_BLOCK1 27 /* CU-_E_U, uint, 0-3 B, RFC7959 */ 139#define COAP_OPTION_SIZE2 28 /* __N_E_U, uint, 0-4 B, RFC7959 */ 140#define COAP_OPTION_Q_BLOCK2 31 /* CU_RE_U, uint, 0-3 B, RFC9177 */ 141#define COAP_OPTION_PROXY_URI 35 /* CU-___U, String, 1-1034 B, RFC7252 */ 142#define COAP_OPTION_PROXY_SCHEME 39 /* CU-___U, String, 1-255 B, RFC7252 */ 143#define COAP_OPTION_SIZE1 60 /* __N_E_U, uint, 0-4 B, RFC7252 */ 144#define COAP_OPTION_ECHO 252 /* _N__E_U, opaque, 0-40 B, RFC9175 */ 145#define COAP_OPTION_NORESPONSE 258 /* _U-_E_U, uint, 0-1 B, RFC7967 */ 146#define COAP_OPTION_RTAG 292 /* ___RE_U, opaque, 0-8 B, RFC9175 */ 147 148#define COAP_MAX_OPT 65535 /**< the highest option number we know */ 149 150/* CoAP result codes (HTTP-Code / 100 * 40 + HTTP-Code % 100) */ 151 152/* As of draft-ietf-core-coap-04, response codes are encoded to base 153 * 32, i.e. the three upper bits determine the response class while 154 * the remaining five fine-grained information specific to that class. 155 */ 156#define COAP_RESPONSE_CODE(N) (((N)/100 << 5) | (N)%100) 157 158/* Determines the class of response code C */ 159#define COAP_RESPONSE_CLASS(C) (((C) >> 5) & 0xFF) 160 161#ifndef SHORT_ERROR_RESPONSE 162/** 163 * Returns a human-readable response phrase for the specified CoAP response @p 164 * code. This function returns @c NULL if not found. 165 * 166 * @param code The response code for which the literal phrase should be 167 * retrieved. 168 * 169 * @return A zero-terminated string describing the error, or @c NULL if not 170 * found. 171 */ 172const char *coap_response_phrase(unsigned char code); 173 174#define COAP_ERROR_PHRASE_LENGTH 32 /**< maximum length of error phrase */ 175 176#else 177#define coap_response_phrase(x) ((char *)NULL) 178 179#define COAP_ERROR_PHRASE_LENGTH 0 /**< maximum length of error phrase */ 180#endif /* SHORT_ERROR_RESPONSE */ 181 182#define COAP_SIGNALING_CODE(N) (((N)/100 << 5) | (N)%100) 183 184typedef enum coap_pdu_signaling_proto_t { 185 COAP_SIGNALING_CSM = COAP_SIGNALING_CODE(701), 186 COAP_SIGNALING_PING = COAP_SIGNALING_CODE(702), 187 COAP_SIGNALING_PONG = COAP_SIGNALING_CODE(703), 188 COAP_SIGNALING_RELEASE = COAP_SIGNALING_CODE(704), 189 COAP_SIGNALING_ABORT = COAP_SIGNALING_CODE(705), 190} coap_pdu_signaling_proto_t; 191 192/* Applies to COAP_SIGNALING_CSM */ 193#define COAP_SIGNALING_OPTION_MAX_MESSAGE_SIZE 2 194#define COAP_SIGNALING_OPTION_BLOCK_WISE_TRANSFER 4 195#define COAP_SIGNALING_OPTION_EXTENDED_TOKEN_LENGTH 6 196 197/* Applies to COAP_SIGNALING_PING / COAP_SIGNALING_PONG */ 198#define COAP_SIGNALING_OPTION_CUSTODY 2 199 200/* Applies to COAP_SIGNALING_RELEASE */ 201#define COAP_SIGNALING_OPTION_ALTERNATIVE_ADDRESS 2 202#define COAP_SIGNALING_OPTION_HOLD_OFF 4 203 204/* Applies to COAP_SIGNALING_ABORT */ 205#define COAP_SIGNALING_OPTION_BAD_CSM_OPTION 2 206 207/* CoAP media type encoding */ 208 209#define COAP_MEDIATYPE_TEXT_PLAIN 0 /* text/plain (UTF-8) */ 210#define COAP_MEDIATYPE_APPLICATION_LINK_FORMAT 40 /* application/link-format */ 211#define COAP_MEDIATYPE_APPLICATION_XML 41 /* application/xml */ 212#define COAP_MEDIATYPE_APPLICATION_OCTET_STREAM 42 /* application/octet-stream */ 213#define COAP_MEDIATYPE_APPLICATION_RDF_XML 43 /* application/rdf+xml */ 214#define COAP_MEDIATYPE_APPLICATION_EXI 47 /* application/exi */ 215#define COAP_MEDIATYPE_APPLICATION_JSON 50 /* application/json */ 216#define COAP_MEDIATYPE_APPLICATION_CBOR 60 /* application/cbor */ 217#define COAP_MEDIATYPE_APPLICATION_CWT 61 /* application/cwt, RFC 8392 */ 218 219/* Content formats from RFC 7390 */ 220#define COAP_MEDIATYPE_APPLICATION_COAP_GROUP_JSON 256 /* application/coap-group+json */ 221 222/* Content formats from RFC 8152 */ 223#define COAP_MEDIATYPE_APPLICATION_COSE_SIGN 98 /* application/cose; cose-type="cose-sign" */ 224#define COAP_MEDIATYPE_APPLICATION_COSE_SIGN1 18 /* application/cose; cose-type="cose-sign1" */ 225#define COAP_MEDIATYPE_APPLICATION_COSE_ENCRYPT 96 /* application/cose; cose-type="cose-encrypt" */ 226#define COAP_MEDIATYPE_APPLICATION_COSE_ENCRYPT0 16 /* application/cose; cose-type="cose-encrypt0" */ 227#define COAP_MEDIATYPE_APPLICATION_COSE_MAC 97 /* application/cose; cose-type="cose-mac" */ 228#define COAP_MEDIATYPE_APPLICATION_COSE_MAC0 17 /* application/cose; cose-type="cose-mac0" */ 229 230#define COAP_MEDIATYPE_APPLICATION_COSE_KEY 101 /* application/cose-key */ 231#define COAP_MEDIATYPE_APPLICATION_COSE_KEY_SET 102 /* application/cose-key-set */ 232 233/* Content formats from RFC 8428 */ 234#define COAP_MEDIATYPE_APPLICATION_SENML_JSON 110 /* application/senml+json */ 235#define COAP_MEDIATYPE_APPLICATION_SENSML_JSON 111 /* application/sensml+json */ 236#define COAP_MEDIATYPE_APPLICATION_SENML_CBOR 112 /* application/senml+cbor */ 237#define COAP_MEDIATYPE_APPLICATION_SENSML_CBOR 113 /* application/sensml+cbor */ 238#define COAP_MEDIATYPE_APPLICATION_SENML_EXI 114 /* application/senml-exi */ 239#define COAP_MEDIATYPE_APPLICATION_SENSML_EXI 115 /* application/sensml-exi */ 240#define COAP_MEDIATYPE_APPLICATION_SENML_XML 310 /* application/senml+xml */ 241#define COAP_MEDIATYPE_APPLICATION_SENSML_XML 311 /* application/sensml+xml */ 242 243/* Content formats from RFC 8782 */ 244#define COAP_MEDIATYPE_APPLICATION_DOTS_CBOR 271 /* application/dots+cbor */ 245 246/* Content formats from RFC 9200 */ 247#define COAP_MEDIATYPE_APPLICATION_ACE_CBOR 19 /* application/ace+cbor */ 248 249/* Content formats from RFC9177 */ 250#define COAP_MEDIATYPE_APPLICATION_MB_CBOR_SEQ 272 /* application/missing-blocks+cbor-seq */ 251 252/* Content formats from RFC 8613 */ 253#define COAP_MEDIATYPE_APPLICATION_OSCORE 10001 /* application/oscore */ 254 255/** 256 * coap_mid_t is used to store the CoAP Message ID of a CoAP PDU. 257 * Valid message ids are 0 to 2^16. Negative values are error codes. 258 */ 259typedef int coap_mid_t; 260 261/** Indicates an invalid message id. */ 262#define COAP_INVALID_MID -1 263 264/** 265 * Indicates an invalid message id. 266 * @deprecated Use COAP_INVALID_MID instead. 267 */ 268#define COAP_INVALID_TID COAP_INVALID_MID 269 270/** 271 * @deprecated Use coap_optlist_t instead. 272 * 273 * Structures for more convenient handling of options. (To be used with ordered 274 * coap_list_t.) The option's data will be added to the end of the coap_option 275 * structure (see macro COAP_OPTION_DATA). 276 */ 277COAP_DEPRECATED typedef struct { 278 uint16_t key; /* the option key (no delta coding) */ 279 unsigned int length; 280} coap_option; 281 282#define COAP_OPTION_KEY(option) (option).key 283#define COAP_OPTION_LENGTH(option) (option).length 284#define COAP_OPTION_DATA(option) ((unsigned char *)&(option) + sizeof(coap_option)) 285 286#ifdef WITH_LWIP 287/** 288 * Creates a CoAP PDU from an lwIP @p pbuf, whose reference is passed on to this 289 * function. 290 * 291 * The pbuf is checked for being contiguous, and for having only one reference. 292 * The reference is stored in the PDU and will be freed when the PDU is freed. 293 * 294 * (For now, these are fatal errors; in future, a new pbuf might be allocated, 295 * the data copied and the passed pbuf freed). 296 * 297 * This behaves like coap_pdu_init(0, 0, 0, pbuf->tot_len), and afterwards 298 * copying the contents of the pbuf to the pdu. 299 * 300 * @return A pointer to the new PDU object or @c NULL on error. 301 */ 302coap_pdu_t *coap_pdu_from_pbuf(struct pbuf *pbuf); 303#endif 304 305/** 306* CoAP protocol types 307*/ 308typedef enum coap_proto_t { 309 COAP_PROTO_NONE = 0, 310 COAP_PROTO_UDP, 311 COAP_PROTO_DTLS, 312 COAP_PROTO_TCP, 313 COAP_PROTO_TLS, 314 COAP_PROTO_WS, 315 COAP_PROTO_WSS, 316 COAP_PROTO_LAST 317} coap_proto_t; 318 319/** 320 * Set of codes available for a PDU. 321 */ 322typedef enum coap_pdu_code_t { 323 COAP_EMPTY_CODE = 0, 324 325 COAP_REQUEST_CODE_GET = COAP_REQUEST_GET, 326 COAP_REQUEST_CODE_POST = COAP_REQUEST_POST, 327 COAP_REQUEST_CODE_PUT = COAP_REQUEST_PUT, 328 COAP_REQUEST_CODE_DELETE = COAP_REQUEST_DELETE, 329 COAP_REQUEST_CODE_FETCH = COAP_REQUEST_FETCH, 330 COAP_REQUEST_CODE_PATCH = COAP_REQUEST_PATCH, 331 COAP_REQUEST_CODE_IPATCH = COAP_REQUEST_IPATCH, 332 333 COAP_RESPONSE_CODE_CREATED = COAP_RESPONSE_CODE(201), 334 COAP_RESPONSE_CODE_DELETED = COAP_RESPONSE_CODE(202), 335 COAP_RESPONSE_CODE_VALID = COAP_RESPONSE_CODE(203), 336 COAP_RESPONSE_CODE_CHANGED = COAP_RESPONSE_CODE(204), 337 COAP_RESPONSE_CODE_CONTENT = COAP_RESPONSE_CODE(205), 338 COAP_RESPONSE_CODE_CONTINUE = COAP_RESPONSE_CODE(231), 339 COAP_RESPONSE_CODE_BAD_REQUEST = COAP_RESPONSE_CODE(400), 340 COAP_RESPONSE_CODE_UNAUTHORIZED = COAP_RESPONSE_CODE(401), 341 COAP_RESPONSE_CODE_BAD_OPTION = COAP_RESPONSE_CODE(402), 342 COAP_RESPONSE_CODE_FORBIDDEN = COAP_RESPONSE_CODE(403), 343 COAP_RESPONSE_CODE_NOT_FOUND = COAP_RESPONSE_CODE(404), 344 COAP_RESPONSE_CODE_NOT_ALLOWED = COAP_RESPONSE_CODE(405), 345 COAP_RESPONSE_CODE_NOT_ACCEPTABLE = COAP_RESPONSE_CODE(406), 346 COAP_RESPONSE_CODE_INCOMPLETE = COAP_RESPONSE_CODE(408), 347 COAP_RESPONSE_CODE_CONFLICT = COAP_RESPONSE_CODE(409), 348 COAP_RESPONSE_CODE_PRECONDITION_FAILED = COAP_RESPONSE_CODE(412), 349 COAP_RESPONSE_CODE_REQUEST_TOO_LARGE = COAP_RESPONSE_CODE(413), 350 COAP_RESPONSE_CODE_UNSUPPORTED_CONTENT_FORMAT = COAP_RESPONSE_CODE(415), 351 COAP_RESPONSE_CODE_UNPROCESSABLE = COAP_RESPONSE_CODE(422), 352 COAP_RESPONSE_CODE_TOO_MANY_REQUESTS = COAP_RESPONSE_CODE(429), 353 COAP_RESPONSE_CODE_INTERNAL_ERROR = COAP_RESPONSE_CODE(500), 354 COAP_RESPONSE_CODE_NOT_IMPLEMENTED = COAP_RESPONSE_CODE(501), 355 COAP_RESPONSE_CODE_BAD_GATEWAY = COAP_RESPONSE_CODE(502), 356 COAP_RESPONSE_CODE_SERVICE_UNAVAILABLE = COAP_RESPONSE_CODE(503), 357 COAP_RESPONSE_CODE_GATEWAY_TIMEOUT = COAP_RESPONSE_CODE(504), 358 COAP_RESPONSE_CODE_PROXYING_NOT_SUPPORTED = COAP_RESPONSE_CODE(505), 359 COAP_RESPONSE_CODE_HOP_LIMIT_REACHED = COAP_RESPONSE_CODE(508), 360 361 COAP_SIGNALING_CODE_CSM = COAP_SIGNALING_CSM, 362 COAP_SIGNALING_CODE_PING = COAP_SIGNALING_PING, 363 COAP_SIGNALING_CODE_PONG = COAP_SIGNALING_PONG, 364 COAP_SIGNALING_CODE_RELEASE = COAP_SIGNALING_RELEASE, 365 COAP_SIGNALING_CODE_ABORT = COAP_SIGNALING_ABORT 366} coap_pdu_code_t; 367 368/** 369 * Creates a new CoAP PDU with at least enough storage space for the given 370 * @p size maximum message size. The function returns a pointer to the 371 * node coap_pdu_t object on success, or @c NULL on error. The storage allocated 372 * for the result must be released with coap_delete_pdu() if coap_send() 373 * is not called. 374 * 375 * @param type The type of the PDU (one of COAP_MESSAGE_CON, COAP_MESSAGE_NON, 376 * COAP_MESSAGE_ACK, COAP_MESSAGE_RST). 377 * @param code The message code of the PDU. 378 * @param mid The message id to set or 0 if unknown / not applicable. 379 * @param size The maximum allowed number of byte for the message. 380 * @return A pointer to the new PDU object or @c NULL on error. 381 */ 382coap_pdu_t *coap_pdu_init(coap_pdu_type_t type, coap_pdu_code_t code, 383 coap_mid_t mid, size_t size); 384 385/** 386 * Creates a new CoAP PDU. 387 * 388 * @param type The type of the PDU (one of COAP_MESSAGE_CON, COAP_MESSAGE_NON, 389 * COAP_MESSAGE_ACK, COAP_MESSAGE_RST). 390 * @param code The message code of the PDU. 391 * @param session The session that will be using this PDU 392 * 393 * @return The skeletal PDU or @c NULL if failure. 394 */ 395coap_pdu_t *coap_new_pdu(coap_pdu_type_t type, coap_pdu_code_t code, 396 coap_session_t *session); 397 398/** 399 * Dispose of an CoAP PDU and frees associated storage. 400 * Not that in general you should not call this function directly. 401 * When a PDU is sent with coap_send(), coap_delete_pdu() will be called 402 * automatically for you. 403 * 404 * @param pdu The PDU for free off. 405 */ 406void coap_delete_pdu(coap_pdu_t *pdu); 407 408/** 409 * Duplicate an existing PDU. Specific options can be ignored and not copied 410 * across. The PDU data payload is not copied across. 411 * 412 * @param old_pdu The PDU to duplicate 413 * @param session The session that will be using this PDU. 414 * @param token_length The length of the token to use in this duplicated PDU. 415 * @param token The token to use in this duplicated PDU. 416 * @param drop_options A list of options not to copy into the duplicated PDU. 417 * If @c NULL, then all options are copied across. 418 * 419 * @return The duplicated PDU or @c NULL if failure. 420 */ 421coap_pdu_t *coap_pdu_duplicate(const coap_pdu_t *old_pdu, 422 coap_session_t *session, 423 size_t token_length, 424 const uint8_t *token, 425 coap_opt_filter_t *drop_options); 426 427/** 428 * Parses @p data into the CoAP PDU structure given in @p result. 429 * The target pdu must be large enough to hold the token, options and data. 430 * This function returns @c 0 on error or a number greater than zero on success. 431 * 432 * @param proto Session's protocol 433 * @param data The raw data to parse as CoAP PDU. 434 * @param length The actual size of @p data. 435 * @param pdu The PDU structure to fill. Note that the structure must 436 * provide space to hold the token, optional options and 437 * optional data. 438 * 439 * @return 1 on success or @c 0 on error. 440 */ 441int coap_pdu_parse(coap_proto_t proto, 442 const uint8_t *data, 443 size_t length, 444 coap_pdu_t *pdu); 445 446/** 447 * Adds token of length @p len to @p pdu. 448 * 449 * This function will fail if a token has already been added to the @p pdu. 450 * 451 * Hence options and data must be added after optional coap_add_token() has 452 * been called. 453 * 454 * @param pdu The PDU where the token is to be added. 455 * @param len The length of the new token. 456 * @param data The token to add. 457 * 458 * @return A value greater than zero on success, or @c 0 on error. 459 */ 460int coap_add_token(coap_pdu_t *pdu, 461 size_t len, 462 const uint8_t *data); 463 464/** 465 * Adds option of given @p number to @p pdu that is passed as first 466 * parameter. 467 * 468 * This function will fail if data has already been added to the @p pdu. 469 * 470 * Hence data must be added after optional coap_add_option() has been called. 471 * 472 * Note: Where possible, the option data needs to be stripped of leading zeros 473 * (big endian) to reduce the amount of data needed in the PDU, as well as in 474 * some cases the maximum data size of an opton can be exceeded if not stripped 475 * and hence be illegal. This is done by using coap_encode_var_safe() or 476 * coap_encode_var_safe8(). 477 * 478 * @param pdu The PDU where the option is to be added. 479 * @param number The number of the new option. 480 * @param len The length of the new option. 481 * @param data The data of the new option. 482 * 483 * @return The overall length of the option or @c 0 on failure. 484 */ 485size_t coap_add_option(coap_pdu_t *pdu, 486 coap_option_num_t number, 487 size_t len, 488 const uint8_t *data); 489 490/** 491 * Adds given data to the pdu that is passed as first parameter. 492 * 493 * This function will fail if data has already been added to the @p pdu. 494 * 495 * @param pdu The PDU where the data is to be added. 496 * @param len The length of the data. 497 * @param data The data to add. 498 * 499 * @return @c 1 if success, else @c 0 if failure. 500 */ 501int coap_add_data(coap_pdu_t *pdu, 502 size_t len, 503 const uint8_t *data); 504 505/** 506 * Adds given data to the pdu that is passed as first parameter but does not 507 * 508 * This function will fail if data has already been added to the @p pdu. 509 * 510 * The actual data must be copied at the returned location. 511 * 512 * @param pdu The PDU where the data is to be added. 513 * @param len The length of the data. 514 * 515 * @return Where to copy the data of len to, or @c NULL is error. 516 */ 517uint8_t *coap_add_data_after(coap_pdu_t *pdu, size_t len); 518 519/** 520 * Retrieves the length and data pointer of specified PDU. Returns 0 on error or 521 * 1 if *len and *data have correct values. Note that these values are destroyed 522 * with the pdu. 523 * 524 * @param pdu The specified PDU. 525 * @param len Returns the length of the current data 526 * @param data Returns the ptr to the current data 527 * 528 * @return @c 1 if len and data are correctly filled in, else 529 * @c 0 if there is no data. 530 */ 531int coap_get_data(const coap_pdu_t *pdu, 532 size_t *len, 533 const uint8_t **data); 534 535/** 536 * Retrieves the data from a PDU, with support for large bodies of data that 537 * spans multiple PDUs. 538 * 539 * Note: The data pointed to on return is destroyed when the PDU is destroyed. 540 * 541 * @param pdu The specified PDU. 542 * @param len Returns the length of the current data 543 * @param data Returns the ptr to the current data 544 * @param offset Returns the offset of the current data from the start of the 545 * body comprising of many blocks (RFC7959) 546 * @param total Returns the total size of the body. 547 * If offset + length < total, then there is more data to follow. 548 * 549 * @return @c 1 if len, data, offset and total are correctly filled in, else 550 * @c 0 if there is no data. 551 */ 552int coap_get_data_large(const coap_pdu_t *pdu, 553 size_t *len, 554 const uint8_t **data, 555 size_t *offset, 556 size_t *total); 557 558/** 559 * Gets the PDU code associated with @p pdu. 560 * 561 * @param pdu The PDU object. 562 * 563 * @return The PDU code. 564 */ 565coap_pdu_code_t coap_pdu_get_code(const coap_pdu_t *pdu); 566 567/** 568 * Sets the PDU code in the @p pdu. 569 * 570 * @param pdu The PDU object. 571 * @param code The code to set in the PDU. 572 */ 573void coap_pdu_set_code(coap_pdu_t *pdu, coap_pdu_code_t code); 574 575/** 576 * Gets the PDU type associated with @p pdu. 577 * 578 * @param pdu The PDU object. 579 * 580 * @return The PDU type. 581 */ 582coap_pdu_type_t coap_pdu_get_type(const coap_pdu_t *pdu); 583 584/** 585 * Sets the PDU type in the @p pdu. 586 * 587 * @param pdu The PDU object. 588 * @param type The type to set for the PDU. 589 */ 590void coap_pdu_set_type(coap_pdu_t *pdu, coap_pdu_type_t type); 591 592/** 593 * Gets the token associated with @p pdu. 594 * 595 * @param pdu The PDU object. 596 * 597 * @return The token information. 598 */ 599coap_bin_const_t coap_pdu_get_token(const coap_pdu_t *pdu); 600 601/** 602 * Gets the message id associated with @p pdu. 603 * 604 * @param pdu The PDU object. 605 * 606 * @return The message id. 607 */ 608coap_mid_t coap_pdu_get_mid(const coap_pdu_t *pdu); 609 610/** 611 * Sets the message id in the @p pdu. 612 * 613 * @param pdu The PDU object. 614 * @param mid The message id value to set in the PDU. 615 * 616 */ 617void coap_pdu_set_mid(coap_pdu_t *pdu, coap_mid_t mid); 618 619/** @} */ 620 621#endif /* COAP_PDU_H_ */ 622