1 /* 2 * rrdef.h 3 * 4 * RR definitions 5 * 6 * a Net::DNS like library for C 7 * 8 * (c) NLnet Labs, 2005-2006 9 * 10 * See the file LICENSE for the license 11 */ 12 13 /** 14 * \file 15 * 16 * Defines resource record types and constants. 17 */ 18 19 #ifndef LDNS_RRDEF_H 20 #define LDNS_RRDEF_H 21 22 #ifdef __cplusplus 23 extern "C" { 24 #endif 25 26 /** Maximum length of a dname label */ 27 #define LDNS_MAX_LABELLEN 63 28 /** Maximum length of a complete dname */ 29 #define LDNS_MAX_DOMAINLEN 255 30 /** Maximum number of pointers in 1 dname */ 31 #define LDNS_MAX_POINTERS 65535 32 /** The bytes TTL, CLASS and length use up in an rr */ 33 #define LDNS_RR_OVERHEAD 10 34 35 #define LDNS_DNSSEC_KEYPROTO 3 36 #define LDNS_KEY_ZONE_KEY 0x0100 /* set for ZSK&KSK, rfc 4034 */ 37 #define LDNS_KEY_SEP_KEY 0x0001 /* set for KSK, rfc 4034 */ 38 #define LDNS_KEY_REVOKE_KEY 0x0080 /* used to revoke KSK, rfc 5011 */ 39 40 /* The first fields are contiguous and can be referenced instantly */ 41 #define LDNS_RDATA_FIELD_DESCRIPTORS_COMMON 259 42 43 /** lookuptable for rr classes */ 44 extern struct sldns_struct_lookup_table* sldns_rr_classes; 45 46 /** 47 * The different RR classes. 48 */ 49 enum sldns_enum_rr_class 50 { 51 /** the Internet */ 52 LDNS_RR_CLASS_IN = 1, 53 /** Chaos class */ 54 LDNS_RR_CLASS_CH = 3, 55 /** Hesiod (Dyer 87) */ 56 LDNS_RR_CLASS_HS = 4, 57 /** None class, dynamic update */ 58 LDNS_RR_CLASS_NONE = 254, 59 /** Any class */ 60 LDNS_RR_CLASS_ANY = 255, 61 62 LDNS_RR_CLASS_FIRST = 0, 63 LDNS_RR_CLASS_LAST = 65535, 64 LDNS_RR_CLASS_COUNT = LDNS_RR_CLASS_LAST - LDNS_RR_CLASS_FIRST + 1 65 }; 66 typedef enum sldns_enum_rr_class sldns_rr_class; 67 68 /** 69 * Used to specify whether compression is allowed. 70 */ 71 enum sldns_enum_rr_compress 72 { 73 /** compression is allowed */ 74 LDNS_RR_COMPRESS, 75 LDNS_RR_NO_COMPRESS 76 }; 77 typedef enum sldns_enum_rr_compress sldns_rr_compress; 78 79 /** 80 * The different RR types. 81 */ 82 enum sldns_enum_rr_type 83 { 84 /** a host address */ 85 LDNS_RR_TYPE_A = 1, 86 /** an authoritative name server */ 87 LDNS_RR_TYPE_NS = 2, 88 /** a mail destination (Obsolete - use MX) */ 89 LDNS_RR_TYPE_MD = 3, 90 /** a mail forwarder (Obsolete - use MX) */ 91 LDNS_RR_TYPE_MF = 4, 92 /** the canonical name for an alias */ 93 LDNS_RR_TYPE_CNAME = 5, 94 /** marks the start of a zone of authority */ 95 LDNS_RR_TYPE_SOA = 6, 96 /** a mailbox domain name (EXPERIMENTAL) */ 97 LDNS_RR_TYPE_MB = 7, 98 /** a mail group member (EXPERIMENTAL) */ 99 LDNS_RR_TYPE_MG = 8, 100 /** a mail rename domain name (EXPERIMENTAL) */ 101 LDNS_RR_TYPE_MR = 9, 102 /** a null RR (EXPERIMENTAL) */ 103 LDNS_RR_TYPE_NULL = 10, 104 /** a well known service description */ 105 LDNS_RR_TYPE_WKS = 11, 106 /** a domain name pointer */ 107 LDNS_RR_TYPE_PTR = 12, 108 /** host information */ 109 LDNS_RR_TYPE_HINFO = 13, 110 /** mailbox or mail list information */ 111 LDNS_RR_TYPE_MINFO = 14, 112 /** mail exchange */ 113 LDNS_RR_TYPE_MX = 15, 114 /** text strings */ 115 LDNS_RR_TYPE_TXT = 16, 116 /** RFC1183 */ 117 LDNS_RR_TYPE_RP = 17, 118 /** RFC1183 */ 119 LDNS_RR_TYPE_AFSDB = 18, 120 /** RFC1183 */ 121 LDNS_RR_TYPE_X25 = 19, 122 /** RFC1183 */ 123 LDNS_RR_TYPE_ISDN = 20, 124 /** RFC1183 */ 125 LDNS_RR_TYPE_RT = 21, 126 /** RFC1706 */ 127 LDNS_RR_TYPE_NSAP = 22, 128 /** RFC1348 */ 129 LDNS_RR_TYPE_NSAP_PTR = 23, 130 /** 2535typecode */ 131 LDNS_RR_TYPE_SIG = 24, 132 /** 2535typecode */ 133 LDNS_RR_TYPE_KEY = 25, 134 /** RFC2163 */ 135 LDNS_RR_TYPE_PX = 26, 136 /** RFC1712 */ 137 LDNS_RR_TYPE_GPOS = 27, 138 /** ipv6 address */ 139 LDNS_RR_TYPE_AAAA = 28, 140 /** LOC record RFC1876 */ 141 LDNS_RR_TYPE_LOC = 29, 142 /** 2535typecode */ 143 LDNS_RR_TYPE_NXT = 30, 144 /** draft-ietf-nimrod-dns-01.txt */ 145 LDNS_RR_TYPE_EID = 31, 146 /** draft-ietf-nimrod-dns-01.txt */ 147 LDNS_RR_TYPE_NIMLOC = 32, 148 /** SRV record RFC2782 */ 149 LDNS_RR_TYPE_SRV = 33, 150 /** http://www.jhsoft.com/rfc/af-saa-0069.000.rtf */ 151 LDNS_RR_TYPE_ATMA = 34, 152 /** RFC2915 */ 153 LDNS_RR_TYPE_NAPTR = 35, 154 /** RFC2230 */ 155 LDNS_RR_TYPE_KX = 36, 156 /** RFC2538 */ 157 LDNS_RR_TYPE_CERT = 37, 158 /** RFC2874 */ 159 LDNS_RR_TYPE_A6 = 38, 160 /** RFC2672 */ 161 LDNS_RR_TYPE_DNAME = 39, 162 /** dnsind-kitchen-sink-02.txt */ 163 LDNS_RR_TYPE_SINK = 40, 164 /** Pseudo OPT record... */ 165 LDNS_RR_TYPE_OPT = 41, 166 /** RFC3123 */ 167 LDNS_RR_TYPE_APL = 42, 168 /** RFC4034, RFC3658 */ 169 LDNS_RR_TYPE_DS = 43, 170 /** SSH Key Fingerprint */ 171 LDNS_RR_TYPE_SSHFP = 44, /* RFC 4255 */ 172 /** IPsec Key */ 173 LDNS_RR_TYPE_IPSECKEY = 45, /* RFC 4025 */ 174 /** DNSSEC */ 175 LDNS_RR_TYPE_RRSIG = 46, /* RFC 4034 */ 176 LDNS_RR_TYPE_NSEC = 47, /* RFC 4034 */ 177 LDNS_RR_TYPE_DNSKEY = 48, /* RFC 4034 */ 178 179 LDNS_RR_TYPE_DHCID = 49, /* RFC 4701 */ 180 /* NSEC3 */ 181 LDNS_RR_TYPE_NSEC3 = 50, /* RFC 5155 */ 182 LDNS_RR_TYPE_NSEC3PARAM = 51, /* RFC 5155 */ 183 LDNS_RR_TYPE_NSEC3PARAMS = 51, 184 LDNS_RR_TYPE_TLSA = 52, /* RFC 6698 */ 185 LDNS_RR_TYPE_SMIMEA = 53, /* RFC 8162 */ 186 LDNS_RR_TYPE_HIP = 55, /* RFC 5205 */ 187 188 /** draft-reid-dnsext-zs */ 189 LDNS_RR_TYPE_NINFO = 56, 190 /** draft-reid-dnsext-rkey */ 191 LDNS_RR_TYPE_RKEY = 57, 192 /** draft-ietf-dnsop-trust-history */ 193 LDNS_RR_TYPE_TALINK = 58, 194 LDNS_RR_TYPE_CDS = 59, /** RFC 7344 */ 195 LDNS_RR_TYPE_CDNSKEY = 60, /** RFC 7344 */ 196 LDNS_RR_TYPE_OPENPGPKEY = 61, /* RFC 7929 */ 197 LDNS_RR_TYPE_CSYNC = 62, /* RFC 7477 */ 198 LDNS_RR_TYPE_ZONEMD = 63, /* draft-ietf-dnsop-dns-zone-digest-12 */ 199 LDNS_RR_TYPE_SVCB = 64, /* draft-ietf-dnsop-svcb-https-04 */ 200 LDNS_RR_TYPE_HTTPS = 65, /* draft-ietf-dnsop-svcb-https-04 */ 201 202 LDNS_RR_TYPE_SPF = 99, /* RFC 4408 */ 203 204 LDNS_RR_TYPE_UINFO = 100, 205 LDNS_RR_TYPE_UID = 101, 206 LDNS_RR_TYPE_GID = 102, 207 LDNS_RR_TYPE_UNSPEC = 103, 208 209 LDNS_RR_TYPE_NID = 104, /* RFC 6742 */ 210 LDNS_RR_TYPE_L32 = 105, /* RFC 6742 */ 211 LDNS_RR_TYPE_L64 = 106, /* RFC 6742 */ 212 LDNS_RR_TYPE_LP = 107, /* RFC 6742 */ 213 214 /** draft-jabley-dnsext-eui48-eui64-rrtypes */ 215 LDNS_RR_TYPE_EUI48 = 108, 216 LDNS_RR_TYPE_EUI64 = 109, 217 218 LDNS_RR_TYPE_TKEY = 249, /* RFC 2930 */ 219 LDNS_RR_TYPE_TSIG = 250, 220 LDNS_RR_TYPE_IXFR = 251, 221 LDNS_RR_TYPE_AXFR = 252, 222 /** A request for mailbox-related records (MB, MG or MR) */ 223 LDNS_RR_TYPE_MAILB = 253, 224 /** A request for mail agent RRs (Obsolete - see MX) */ 225 LDNS_RR_TYPE_MAILA = 254, 226 /** any type (wildcard) */ 227 LDNS_RR_TYPE_ANY = 255, 228 LDNS_RR_TYPE_URI = 256, /* RFC 7553 */ 229 LDNS_RR_TYPE_CAA = 257, /* RFC 6844 */ 230 LDNS_RR_TYPE_AVC = 258, 231 232 /** DNSSEC Trust Authorities */ 233 LDNS_RR_TYPE_TA = 32768, 234 /* RFC 4431, 5074, DNSSEC Lookaside Validation */ 235 LDNS_RR_TYPE_DLV = 32769, 236 237 /* type codes from nsec3 experimental phase 238 LDNS_RR_TYPE_NSEC3 = 65324, 239 LDNS_RR_TYPE_NSEC3PARAMS = 65325, */ 240 LDNS_RR_TYPE_FIRST = 0, 241 LDNS_RR_TYPE_LAST = 65535, 242 LDNS_RR_TYPE_COUNT = LDNS_RR_TYPE_LAST - LDNS_RR_TYPE_FIRST + 1 243 }; 244 typedef enum sldns_enum_rr_type sldns_rr_type; 245 246 /* RDATA */ 247 #define LDNS_MAX_RDFLEN 65535 248 249 #define LDNS_RDF_SIZE_BYTE 1 250 #define LDNS_RDF_SIZE_WORD 2 251 #define LDNS_RDF_SIZE_DOUBLEWORD 4 252 #define LDNS_RDF_SIZE_6BYTES 6 253 #define LDNS_RDF_SIZE_8BYTES 8 254 #define LDNS_RDF_SIZE_16BYTES 16 255 256 #define LDNS_NSEC3_VARS_OPTOUT_MASK 0x01 257 258 #define LDNS_APL_IP4 1 259 #define LDNS_APL_IP6 2 260 #define LDNS_APL_MASK 0x7f 261 #define LDNS_APL_NEGATION 0x80 262 263 /** 264 * The different types of RDATA fields. 265 */ 266 enum sldns_enum_rdf_type 267 { 268 /** none */ 269 LDNS_RDF_TYPE_NONE, 270 /** domain name */ 271 LDNS_RDF_TYPE_DNAME, 272 /** 8 bits */ 273 LDNS_RDF_TYPE_INT8, 274 /** 16 bits */ 275 LDNS_RDF_TYPE_INT16, 276 /** 32 bits */ 277 LDNS_RDF_TYPE_INT32, 278 /** A record */ 279 LDNS_RDF_TYPE_A, 280 /** AAAA record */ 281 LDNS_RDF_TYPE_AAAA, 282 /** txt string */ 283 LDNS_RDF_TYPE_STR, 284 /** apl data */ 285 LDNS_RDF_TYPE_APL, 286 /** b32 string */ 287 LDNS_RDF_TYPE_B32_EXT, 288 /** b64 string */ 289 LDNS_RDF_TYPE_B64, 290 /** hex string */ 291 LDNS_RDF_TYPE_HEX, 292 /** nsec type codes */ 293 LDNS_RDF_TYPE_NSEC, 294 /** a RR type */ 295 LDNS_RDF_TYPE_TYPE, 296 /** a class */ 297 LDNS_RDF_TYPE_CLASS, 298 /** certificate algorithm */ 299 LDNS_RDF_TYPE_CERT_ALG, 300 /** a key algorithm */ 301 LDNS_RDF_TYPE_ALG, 302 /** unknown types */ 303 LDNS_RDF_TYPE_UNKNOWN, 304 /** time (32 bits) */ 305 LDNS_RDF_TYPE_TIME, 306 /** period */ 307 LDNS_RDF_TYPE_PERIOD, 308 /** tsig time 48 bits */ 309 LDNS_RDF_TYPE_TSIGTIME, 310 /** Represents the Public Key Algorithm, HIT and Public Key fields 311 for the HIP RR types. A HIP specific rdf type is used because of 312 the unusual layout in wireformat (see RFC 5205 Section 5) */ 313 LDNS_RDF_TYPE_HIP, 314 /** variable length any type rdata where the length 315 is specified by the first 2 bytes */ 316 LDNS_RDF_TYPE_INT16_DATA, 317 /** protocol and port bitmaps */ 318 LDNS_RDF_TYPE_SERVICE, 319 /** location data */ 320 LDNS_RDF_TYPE_LOC, 321 /** well known services */ 322 LDNS_RDF_TYPE_WKS, 323 /** NSAP */ 324 LDNS_RDF_TYPE_NSAP, 325 /** ATMA */ 326 LDNS_RDF_TYPE_ATMA, 327 /** IPSECKEY */ 328 LDNS_RDF_TYPE_IPSECKEY, 329 /** nsec3 hash salt */ 330 LDNS_RDF_TYPE_NSEC3_SALT, 331 /** nsec3 base32 string (with length byte on wire */ 332 LDNS_RDF_TYPE_NSEC3_NEXT_OWNER, 333 334 /** 4 shorts represented as 4 * 16 bit hex numbers 335 * separated by colons. For NID and L64. 336 */ 337 LDNS_RDF_TYPE_ILNP64, 338 339 /** 6 * 8 bit hex numbers separated by dashes. For EUI48. */ 340 LDNS_RDF_TYPE_EUI48, 341 /** 8 * 8 bit hex numbers separated by dashes. For EUI64. */ 342 LDNS_RDF_TYPE_EUI64, 343 344 /** A non-zero sequence of US-ASCII letters and numbers in lower case. 345 * For CAA. 346 */ 347 LDNS_RDF_TYPE_TAG, 348 349 /** A <character-string> encoding of the value field as specified 350 * [RFC1035], Section 5.1., encoded as remaining rdata. 351 * For CAA, URI. 352 */ 353 LDNS_RDF_TYPE_LONG_STR, 354 355 /** TSIG extended 16bit error value */ 356 LDNS_RDF_TYPE_TSIGERROR, 357 358 /* draft-ietf-dnsop-svcb-https-05: 359 * each SvcParam consisting of a SvcParamKey=SvcParamValue pair or 360 * a standalone SvcParamKey */ 361 LDNS_RDF_TYPE_SVCPARAM, 362 363 /* Aliases */ 364 LDNS_RDF_TYPE_BITMAP = LDNS_RDF_TYPE_NSEC, 365 }; 366 typedef enum sldns_enum_rdf_type sldns_rdf_type; 367 368 /** 369 * Algorithms used in dns 370 */ 371 enum sldns_enum_algorithm 372 { 373 LDNS_RSAMD5 = 1, /* RFC 4034,4035 */ 374 LDNS_DH = 2, 375 LDNS_DSA = 3, 376 LDNS_ECC = 4, 377 LDNS_RSASHA1 = 5, 378 LDNS_DSA_NSEC3 = 6, 379 LDNS_RSASHA1_NSEC3 = 7, 380 LDNS_RSASHA256 = 8, /* RFC 5702 */ 381 LDNS_RSASHA512 = 10, /* RFC 5702 */ 382 LDNS_ECC_GOST = 12, /* RFC 5933 */ 383 LDNS_ECDSAP256SHA256 = 13, /* RFC 6605 */ 384 LDNS_ECDSAP384SHA384 = 14, /* RFC 6605 */ 385 LDNS_ED25519 = 15, /* RFC 8080 */ 386 LDNS_ED448 = 16, /* RFC 8080 */ 387 LDNS_INDIRECT = 252, 388 LDNS_PRIVATEDNS = 253, 389 LDNS_PRIVATEOID = 254 390 }; 391 typedef enum sldns_enum_algorithm sldns_algorithm; 392 393 /** 394 * Hashing algorithms used in the DS record 395 */ 396 enum sldns_enum_hash 397 { 398 LDNS_SHA1 = 1, /* RFC 4034 */ 399 LDNS_SHA256 = 2, /* RFC 4509 */ 400 LDNS_HASH_GOST = 3, /* RFC 5933 */ 401 LDNS_SHA384 = 4 /* RFC 6605 */ 402 }; 403 typedef enum sldns_enum_hash sldns_hash; 404 405 /** 406 * algorithms used in CERT rrs 407 */ 408 enum sldns_enum_cert_algorithm 409 { 410 LDNS_CERT_PKIX = 1, 411 LDNS_CERT_SPKI = 2, 412 LDNS_CERT_PGP = 3, 413 LDNS_CERT_IPKIX = 4, 414 LDNS_CERT_ISPKI = 5, 415 LDNS_CERT_IPGP = 6, 416 LDNS_CERT_ACPKIX = 7, 417 LDNS_CERT_IACPKIX = 8, 418 LDNS_CERT_URI = 253, 419 LDNS_CERT_OID = 254 420 }; 421 typedef enum sldns_enum_cert_algorithm sldns_cert_algorithm; 422 423 /** 424 * EDNS option codes 425 */ 426 enum sldns_enum_edns_option 427 { 428 LDNS_EDNS_LLQ = 1, /* http://files.dns-sd.org/draft-sekar-dns-llq.txt */ 429 LDNS_EDNS_UL = 2, /* http://files.dns-sd.org/draft-sekar-dns-ul.txt */ 430 LDNS_EDNS_NSID = 3, /* RFC5001 */ 431 /* 4 draft-cheshire-edns0-owner-option */ 432 LDNS_EDNS_DAU = 5, /* RFC6975 */ 433 LDNS_EDNS_DHU = 6, /* RFC6975 */ 434 LDNS_EDNS_N3U = 7, /* RFC6975 */ 435 LDNS_EDNS_CLIENT_SUBNET = 8, /* RFC7871 */ 436 LDNS_EDNS_COOKIE = 10, /* RFC7873 */ 437 LDNS_EDNS_KEEPALIVE = 11, /* draft-ietf-dnsop-edns-tcp-keepalive*/ 438 LDNS_EDNS_PADDING = 12, /* RFC7830 */ 439 LDNS_EDNS_EDE = 15, /* RFC8914 */ 440 LDNS_EDNS_CLIENT_TAG = 16, /* draft-bellis-dnsop-edns-tags-01 */ 441 LDNS_EDNS_UNBOUND_CACHEDB_TESTFRAME_TEST = 65534 442 }; 443 typedef enum sldns_enum_edns_option sldns_edns_option; 444 445 enum sldns_enum_ede_code 446 { 447 LDNS_EDE_NONE = -1, /* EDE undefined for internal use */ 448 LDNS_EDE_OTHER = 0, 449 LDNS_EDE_UNSUPPORTED_DNSKEY_ALG = 1, 450 LDNS_EDE_UNSUPPORTED_DS_DIGEST = 2, 451 LDNS_EDE_STALE_ANSWER = 3, 452 LDNS_EDE_FORGED_ANSWER = 4, 453 LDNS_EDE_DNSSEC_INDETERMINATE = 5, 454 LDNS_EDE_DNSSEC_BOGUS = 6, 455 LDNS_EDE_SIGNATURE_EXPIRED = 7, 456 LDNS_EDE_SIGNATURE_NOT_YET_VALID = 8, 457 LDNS_EDE_DNSKEY_MISSING = 9, 458 LDNS_EDE_RRSIGS_MISSING = 10, 459 LDNS_EDE_NO_ZONE_KEY_BIT_SET = 11, 460 LDNS_EDE_NSEC_MISSING = 12, 461 LDNS_EDE_CACHED_ERROR = 13, 462 LDNS_EDE_NOT_READY = 14, 463 LDNS_EDE_BLOCKED = 15, 464 LDNS_EDE_CENSORED = 16, 465 LDNS_EDE_FILTERED = 17, 466 LDNS_EDE_PROHIBITED = 18, 467 LDNS_EDE_STALE_NXDOMAIN_ANSWER = 19, 468 LDNS_EDE_NOT_AUTHORITATIVE = 20, 469 LDNS_EDE_NOT_SUPPORTED = 21, 470 LDNS_EDE_NO_REACHABLE_AUTHORITY = 22, 471 LDNS_EDE_NETWORK_ERROR = 23, 472 LDNS_EDE_INVALID_DATA = 24, 473 }; 474 typedef enum sldns_enum_ede_code sldns_ede_code; 475 476 #define LDNS_EDNS_MASK_DO_BIT 0x8000 477 478 /** TSIG and TKEY extended rcodes (16bit), 0-15 are the normal rcodes. */ 479 #define LDNS_TSIG_ERROR_NOERROR 0 480 #define LDNS_TSIG_ERROR_BADSIG 16 481 #define LDNS_TSIG_ERROR_BADKEY 17 482 #define LDNS_TSIG_ERROR_BADTIME 18 483 #define LDNS_TSIG_ERROR_BADMODE 19 484 #define LDNS_TSIG_ERROR_BADNAME 20 485 #define LDNS_TSIG_ERROR_BADALG 21 486 487 /** DNS Cookie extended rcode */ 488 #define LDNS_EXT_RCODE_BADCOOKIE 23 489 490 /** 491 * Contains all information about resource record types. 492 * 493 * This structure contains, for all rr types, the rdata fields that are defined. 494 */ 495 struct sldns_struct_rr_descriptor 496 { 497 /** Type of the RR that is described here */ 498 sldns_rr_type _type; 499 /** Textual name of the RR type. */ 500 const char *_name; 501 /** Minimum number of rdata fields in the RRs of this type. */ 502 uint8_t _minimum; 503 /** Maximum number of rdata fields in the RRs of this type. */ 504 uint8_t _maximum; 505 /** Wireformat specification for the rr, i.e. the types of rdata fields in their respective order. */ 506 const sldns_rdf_type *_wireformat; 507 /** Special rdf types */ 508 sldns_rdf_type _variable; 509 /** Specifies whether compression can be used for dnames in this RR type. */ 510 sldns_rr_compress _compress; 511 /** The number of DNAMEs in the _wireformat string, for parsing. */ 512 uint8_t _dname_count; 513 }; 514 typedef struct sldns_struct_rr_descriptor sldns_rr_descriptor; 515 516 /** 517 * returns the resource record descriptor for the given rr type. 518 * 519 * \param[in] type the type value of the rr type 520 *\return the sldns_rr_descriptor for this type 521 */ 522 const sldns_rr_descriptor *sldns_rr_descript(uint16_t type); 523 524 /** 525 * returns the minimum number of rdata fields of the rr type this descriptor describes. 526 * 527 * \param[in] descriptor for an rr type 528 * \return the minimum number of rdata fields 529 */ 530 size_t sldns_rr_descriptor_minimum(const sldns_rr_descriptor *descriptor); 531 532 /** 533 * returns the maximum number of rdata fields of the rr type this descriptor describes. 534 * 535 * \param[in] descriptor for an rr type 536 * \return the maximum number of rdata fields 537 */ 538 size_t sldns_rr_descriptor_maximum(const sldns_rr_descriptor *descriptor); 539 540 /** 541 * returns the rdf type for the given rdata field number of the rr type for the given descriptor. 542 * 543 * \param[in] descriptor for an rr type 544 * \param[in] field the field number 545 * \return the rdf type for the field 546 */ 547 sldns_rdf_type sldns_rr_descriptor_field_type(const sldns_rr_descriptor *descriptor, size_t field); 548 549 /** 550 * retrieves a rrtype by looking up its name. 551 * \param[in] name a string with the name 552 * \return the type which corresponds with the name 553 */ 554 sldns_rr_type sldns_get_rr_type_by_name(const char *name); 555 556 /** 557 * retrieves a class by looking up its name. 558 * \param[in] name string with the name 559 * \return the cass which corresponds with the name 560 */ 561 sldns_rr_class sldns_get_rr_class_by_name(const char *name); 562 563 #ifdef __cplusplus 564 } 565 #endif 566 567 #endif /* LDNS_RRDEF_H */ 568