1ldns(3) Library Functions Manual ldns(3)
2
6 ldns_rr, ldns_rr_class, ldns_rr_type, ldns_rr_compress, ldns_rr_list -
7 types representing dns resource records
8
11 #include <stdint.h>
12 #include <stdbool.h>
13 #include <ldns/ldns.h>
15
17 ldns_rr
18 Resource Record
19 This is the basic DNS element that contains actual data
21 From RFC1035:
23 <pre>
24 3.2.1. Format
25 All RRs have the same top level format shown below:
27 1 1 1 1 1 1
29 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
30 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
31 | |
32 / /
33 / NAME /
34 | |
35 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
36 | TYPE |
37 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
38 | CLASS |
39 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
40 | TTL |
41 | |
42 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
43 | RDLENGTH |
44 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
45 / RDATA /
46 / /
47 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
48 where:
50 NAME an owner name, i.e., the name of the node to
52 which this
53 resource record pertains.
54 TYPE two octets containing one of the RR TYPE codes.
56 CLASS two octets containing one of the RR CLASS codes.
58 TTL a 32 bit signed integer that specifies the time
60 interval
61 that the resource record may be cached before
62 the source
63 of the information should again be consulted.
64 Zero
65 values are interpreted to mean that the RR can
66 only be
67 used for the transaction in progress, and should
68 not be
69 cached. For example, SOA records are always
70 distributed
71 with a zero TTL to prohibit caching. Zero val‐
72 ues can
73 also be used for extremely volatile data.
74 RDLENGTH an unsigned 16 bit integer that specifies the
76 length in
77 octets of the RDATA field.
78 RDATA a variable length string of octets that de‐
80 scribes the
81 resource. The format of this information varies
82 according to the TYPE and CLASS of the resource
83 record.
84 </pre>
85 The actual amount and type of rdata fields depend on the RR type
87 of the
88 RR, and can be found by using \ref ldns_rr_descriptor functions.
89 struct ldns_struct_rr
90 {
91 Owner name, uncompressed:
92 ldns_rdf *_owner;
93 Time to live:
94 uint32_t _ttl;
95 Number of data fields:
96 size_t _rd_count;
97 the type of the RR. A, MX etc.:
98 ldns_rr_type _rr_type;
99 Class of the resource record.:
100 ldns_rr_class _rr_class;
101 /* everything in the rdata is in network order */
102 The array of rdata's:
103 ldns_rdf **_rdata_fields;
104 /** question rr [it would be nicer if thous is after
105 _rd_count]
106 ABI change: Fix this in next major release
107 */
108 bool _rr_question;
109 };
110 typedef struct ldns_struct_rr ldns_rr;
111 ldns_rr_class
113 The different RR classes.
114 enum ldns_enum_rr_class
115 {
116 the Internet:
117 LDNS_RR_CLASS_IN = 1,
118 Chaos class:
119 LDNS_RR_CLASS_CH = 3,
120 Hesiod (Dyer 87):
121 LDNS_RR_CLASS_HS = 4,
122 None class, dynamic update:
123 LDNS_RR_CLASS_NONE = 254,
124 Any class:
125 LDNS_RR_CLASS_ANY = 255,
126 LDNS_RR_CLASS_FIRST = 0,
128 LDNS_RR_CLASS_LAST = 65535,
129 LDNS_RR_CLASS_COUNT = LDNS_RR_CLASS_LAST -
130 LDNS_RR_CLASS_FIRST + 1
131 };
132 typedef enum ldns_enum_rr_class ldns_rr_class;
133 ldns_rr_type
135 The different RR types.
136 enum ldns_enum_rr_type
137 {
138 a host address:
139 LDNS_RR_TYPE_A = 1,
140 an authoritative name server:
141 LDNS_RR_TYPE_NS = 2,
142 a mail destination (Obsolete - use MX):
143 LDNS_RR_TYPE_MD = 3,
144 a mail forwarder (Obsolete - use MX):
145 LDNS_RR_TYPE_MF = 4,
146 the canonical name for an alias:
147 LDNS_RR_TYPE_CNAME = 5,
148 marks the start of a zone of authority:
149 LDNS_RR_TYPE_SOA = 6,
150 a mailbox domain name (EXPERIMENTAL):
151 LDNS_RR_TYPE_MB = 7,
152 a mail group member (EXPERIMENTAL):
153 LDNS_RR_TYPE_MG = 8,
154 a mail rename domain name (EXPERIMENTAL):
155 LDNS_RR_TYPE_MR = 9,
156 a null RR (EXPERIMENTAL):
157 LDNS_RR_TYPE_NULL = 10,
158 a well known service description:
159 LDNS_RR_TYPE_WKS = 11,
160 a domain name pointer:
161 LDNS_RR_TYPE_PTR = 12,
162 host information:
163 LDNS_RR_TYPE_HINFO = 13,
164 mailbox or mail list information:
165 LDNS_RR_TYPE_MINFO = 14,
166 mail exchange:
167 LDNS_RR_TYPE_MX = 15,
168 text strings:
169 LDNS_RR_TYPE_TXT = 16,
170 RFC1183:
171 LDNS_RR_TYPE_RP = 17,
172 RFC1183:
173 LDNS_RR_TYPE_AFSDB = 18,
174 RFC1183:
175 LDNS_RR_TYPE_X25 = 19,
176 RFC1183:
177 LDNS_RR_TYPE_ISDN = 20,
178 RFC1183:
179 LDNS_RR_TYPE_RT = 21,
180 RFC1706:
181 LDNS_RR_TYPE_NSAP = 22,
182 RFC1348:
183 LDNS_RR_TYPE_NSAP_PTR = 23,
184 2535typecode:
185 LDNS_RR_TYPE_SIG = 24,
186 2535typecode:
187 LDNS_RR_TYPE_KEY = 25,
188 RFC2163:
189 LDNS_RR_TYPE_PX = 26,
190 RFC1712:
191 LDNS_RR_TYPE_GPOS = 27,
192 ipv6 address:
193 LDNS_RR_TYPE_AAAA = 28,
194 LOC record RFC1876:
195 LDNS_RR_TYPE_LOC = 29,
196 2535typecode:
197 LDNS_RR_TYPE_NXT = 30,
198 draft-ietf-nimrod-dns-01.txt:
199 LDNS_RR_TYPE_EID = 31,
200 draft-ietf-nimrod-dns-01.txt:
201 LDNS_RR_TYPE_NIMLOC = 32,
202 SRV record RFC2782:
203 LDNS_RR_TYPE_SRV = 33,
204 http://www.jhsoft.com/rfc/af-saa-0069.000.rtf:
205 LDNS_RR_TYPE_ATMA = 34,
206 RFC2915:
207 LDNS_RR_TYPE_NAPTR = 35,
208 RFC2230:
209 LDNS_RR_TYPE_KX = 36,
210 RFC2538:
211 LDNS_RR_TYPE_CERT = 37,
212 RFC2874:
213 LDNS_RR_TYPE_A6 = 38,
214 RFC2672:
215 LDNS_RR_TYPE_DNAME = 39,
216 dnsind-kitchen-sink-02.txt:
217 LDNS_RR_TYPE_SINK = 40,
218 Pseudo OPT record...:
219 LDNS_RR_TYPE_OPT = 41,
220 RFC3123:
221 LDNS_RR_TYPE_APL = 42,
222 RFC4034, RFC3658:
223 LDNS_RR_TYPE_DS = 43,
224 SSH Key Fingerprint:
225 LDNS_RR_TYPE_SSHFP = 44, /* RFC 4255 */
226 IPsec Key:
227 LDNS_RR_TYPE_IPSECKEY = 45, /* RFC 4025 */
228 DNSSEC:
229 LDNS_RR_TYPE_RRSIG = 46, /* RFC 4034 */
230 LDNS_RR_TYPE_NSEC = 47, /* RFC 4034 */
231 LDNS_RR_TYPE_DNSKEY = 48, /* RFC 4034 */
232 LDNS_RR_TYPE_DHCID = 49, /* RFC 4701 */
234 /* NSEC3 */
235 LDNS_RR_TYPE_NSEC3 = 50, /* RFC 5155 */
236 LDNS_RR_TYPE_NSEC3PARAM = 51, /* RFC 5155 */
237 LDNS_RR_TYPE_NSEC3PARAMS = 51,
238 LDNS_RR_TYPE_TLSA = 52, /* RFC 6698 */
239 LDNS_RR_TYPE_SMIMEA = 53, /* RFC 8162 */
240 LDNS_RR_TYPE_HIP = 55, /* RFC 5205 */
242 draft-reid-dnsext-zs:
244 LDNS_RR_TYPE_NINFO = 56,
245 draft-reid-dnsext-rkey:
246 LDNS_RR_TYPE_RKEY = 57,
247 draft-ietf-dnsop-trust-history:
248 LDNS_RR_TYPE_TALINK = 58,
249 LDNS_RR_TYPE_CDS = 59, /* RFC 7344 */
250 LDNS_RR_TYPE_CDNSKEY = 60, /* RFC 7344 */
251 LDNS_RR_TYPE_OPENPGPKEY = 61, /* RFC 7929 */
252 LDNS_RR_TYPE_CSYNC = 62, /* RFC 7477 */
253 LDNS_RR_TYPE_ZONEMD = 63, /* draft-wessels-dns-zone-digest
254 */
255 LDNS_RR_TYPE_SPF = 99, /* RFC 4408 */
257 LDNS_RR_TYPE_UINFO = 100,
259 LDNS_RR_TYPE_UID = 101,
260 LDNS_RR_TYPE_GID = 102,
261 LDNS_RR_TYPE_UNSPEC = 103,
262 LDNS_RR_TYPE_NID = 104, /* RFC 6742 */
264 LDNS_RR_TYPE_L32 = 105, /* RFC 6742 */
265 LDNS_RR_TYPE_L64 = 106, /* RFC 6742 */
266 LDNS_RR_TYPE_LP = 107, /* RFC 6742 */
267 LDNS_RR_TYPE_EUI48 = 108, /* RFC 7043 */
269 LDNS_RR_TYPE_EUI64 = 109, /* RFC 7043 */
270 LDNS_RR_TYPE_TKEY = 249, /* RFC 2930 */
272 LDNS_RR_TYPE_TSIG = 250,
273 LDNS_RR_TYPE_IXFR = 251,
274 LDNS_RR_TYPE_AXFR = 252,
275 A request for mailbox-related records (MB, MG or MR):
276 LDNS_RR_TYPE_MAILB = 253,
277 A request for mail agent RRs (Obsolete - see MX):
278 LDNS_RR_TYPE_MAILA = 254,
279 any type (wildcard):
280 LDNS_RR_TYPE_ANY = 255,
281 LDNS_RR_TYPE_URI = 256, /* RFC 7553 */
282 LDNS_RR_TYPE_CAA = 257, /* RFC 6844 */
283 LDNS_RR_TYPE_AVC = 258, /* Cisco's DNS-AS RR, see www.dns-
284 as.org */
285 LDNS_RR_TYPE_DOA = 259, /* draft-durand-doa-over-dns */
286 draft-ietf-mboned-driad-amt-discovery *:
288 LDNS_RR_TYPE_AMTRELAY = 260,
289 DNSSEC Trust Authorities:
291 LDNS_RR_TYPE_TA = 32768,
292 /* RFC 4431, 5074, DNSSEC Lookaside Validation */
293 LDNS_RR_TYPE_DLV = 32769,
294 /* type codes from nsec3 experimental phase
296 LDNS_RR_TYPE_NSEC3 = 65324,
297 LDNS_RR_TYPE_NSEC3PARAMS = 65325, */
298 LDNS_RR_TYPE_FIRST = 0,
299 LDNS_RR_TYPE_LAST = 65535,
300 LDNS_RR_TYPE_COUNT = LDNS_RR_TYPE_LAST - LDNS_RR_TYPE_FIRST
301 + 1
302 };
303 typedef enum ldns_enum_rr_type ldns_rr_type;
304 ldns_rr_compress
306 Used to specify whether compression is allowed.
307 enum ldns_enum_rr_compress
308 {
309 compression is allowed:
310 LDNS_RR_COMPRESS,
311 LDNS_RR_NO_COMPRESS
312 };
313 typedef enum ldns_enum_rr_compress ldns_rr_compress;
314 ldns_rr_list
316 List or Set of Resource Records
317 Contains a list of rr's <br>
319 No official RFC-like checks are made
320 struct ldns_struct_rr_list
321 {
322 size_t _rr_count;
323 size_t _rr_capacity;
324 ldns_rr **_rrs;
325 };
326 typedef struct ldns_struct_rr_list ldns_rr_list;
327
329 The ldns team at NLnet Labs.
330
333 Please report bugs to ldns-team@nlnetlabs.nl or in our bugzilla at
334 http://www.nlnetlabs.nl/bugs/index.html
335
338 Copyright (c) 2004 - 2006 NLnet Labs.
339 Licensed under the BSD License. There is NO warranty; not even for MER‐
341 CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
342
345 ldns_rr_new, ldns_rr_new_frm_type, ldns_rr_new_frm_str,
346 ldns_rr_new_frm_fp, ldns_rr_free, ldns_rr_print, ldns_rr_set_owner,
347 ldns_rr_set_ttl, ldns_rr_set_type, ldns_rr_set_rd_count,
348 ldns_rr_set_class, ldns_rr_set_rdf, ldns_rr_push_rdf, ldns_rr_pop_rdf,
349 ldns_rr_rdf, ldns_rr_owner, ldns_rr_rd_count, ldns_rr_ttl,
350 ldns_rr_get_class, ldns_rr_list_rr_count, ldns_rr_list_set_rr_count,
351 ldns_rr_list_new, ldns_rr_list_free, ldns_rr_list_cat,
352 ldns_rr_list_push_rr, ldns_rr_list_pop_rr, ldns_is_rrset,
353 ldns_rr_set_push_rr, ldns_rr_set_pop_rr, ldns_get_rr_class_by_name,
354 ldns_get_rr_type_by_name, ldns_rr_list_clone, ldns_rr_list_sort,
355 ldns_rr_compare, ldns_rr_compare_ds, ldns_rr_uncompressed_size,
356 ldns_rr2canonical, ldns_rr_label_count, ldns_is_rrset, ldns_rr_descrip‐
357 tor, ldns_rr_descript. And perldoc Net::DNS, RFC1034, RFC1035,
358 RFC4033, RFC4034 and RFC4035.
359
361 This manpage was automatically generated from the ldns source code.
362 30 May 2006 ldns(3)