1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
|
/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \brief DNS resource record descriptions.
*
* \addtogroup rr
* @{
*/
#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#define KNOT_MAX_RDATA_BLOCKS 8
#define KNOT_MAX_RDATA_DNAMES 2 // Update this when defining new RR types!
/*!
* \brief Resource record class codes.
*
* https://www.iana.org/assignments/dns-parameters/dns-parameters.xml
*/
enum knot_rr_class {
KNOT_CLASS_IN = 1,
KNOT_CLASS_CH = 3,
KNOT_CLASS_NONE = 254,
KNOT_CLASS_ANY = 255
};
/*!
* \brief Resource record type constants.
*
* References:
* https://www.iana.org/assignments/dns-parameters/dns-parameters.xml
* RFC 3597#4
*
* METATYPE: Contains DNS data that can't be in a zone file.
* QTYPE: Specifies DNS query type; can't be in a zone file.
*/
enum knot_rr_type {
KNOT_RRTYPE_A = 1, /*!< An IPv4 host address. */
KNOT_RRTYPE_NS = 2, /*!< An authoritative name server. */
KNOT_RRTYPE_CNAME = 5, /*!< The canonical name for an alias. */
KNOT_RRTYPE_SOA = 6, /*!< The start of a zone of authority. */
KNOT_RRTYPE_NULL = 10, /*!< METATYPE. Used in RFC 8145. */
KNOT_RRTYPE_PTR = 12, /*!< A domain name pointer. */
KNOT_RRTYPE_HINFO = 13, /*!< A host information. */
KNOT_RRTYPE_MINFO = 14, /*!< A mailbox information. */
KNOT_RRTYPE_MX = 15, /*!< Mail exchange. */
KNOT_RRTYPE_TXT = 16, /*!< Text strings. */
KNOT_RRTYPE_RP = 17, /*!< For responsible person. */
KNOT_RRTYPE_AFSDB = 18, /*!< For AFS Data Base location. */
KNOT_RRTYPE_RT = 21, /*!< For route through. */
KNOT_RRTYPE_SIG = 24, /*!< METATYPE. Transaction signature. */
KNOT_RRTYPE_KEY = 25, /*!< For security key. */
KNOT_RRTYPE_AAAA = 28, /*!< IPv6 address. */
KNOT_RRTYPE_LOC = 29, /*!< Location information. */
KNOT_RRTYPE_SRV = 33, /*!< Server selection. */
KNOT_RRTYPE_NAPTR = 35, /*!< Naming authority pointer . */
KNOT_RRTYPE_KX = 36, /*!< Key exchanger. */
KNOT_RRTYPE_CERT = 37, /*!< Certificate record. */
KNOT_RRTYPE_DNAME = 39, /*!< Delegation name. */
KNOT_RRTYPE_OPT = 41, /*!< METATYPE. Option for EDNS. */
KNOT_RRTYPE_APL = 42, /*!< Address prefix list. */
KNOT_RRTYPE_DS = 43, /*!< Delegation signer. */
KNOT_RRTYPE_SSHFP = 44, /*!< SSH public key fingerprint. */
KNOT_RRTYPE_IPSECKEY = 45, /*!< IPSEC key. */
KNOT_RRTYPE_RRSIG = 46, /*!< DNSSEC signature. */
KNOT_RRTYPE_NSEC = 47, /*!< Next-secure record. */
KNOT_RRTYPE_DNSKEY = 48, /*!< DNS key. */
KNOT_RRTYPE_DHCID = 49, /*!< DHCP identifier. */
KNOT_RRTYPE_NSEC3 = 50, /*!< NSEC version 3. */
KNOT_RRTYPE_NSEC3PARAM = 51, /*!< NSEC3 parameters. */
KNOT_RRTYPE_TLSA = 52, /*!< DANE record. */
KNOT_RRTYPE_SMIMEA = 53, /*!< S/MIME cert association. */
KNOT_RRTYPE_CDS = 59, /*!< Child delegation signer. */
KNOT_RRTYPE_CDNSKEY = 60, /*!< Child DNS key. */
KNOT_RRTYPE_OPENPGPKEY = 61, /*!< OpenPGP Key. */
KNOT_RRTYPE_CSYNC = 62, /*!< Child-To-Parent synchronization. */
KNOT_RRTYPE_ZONEMD = 63, /*!< Message digest for DNS zone. */
KNOT_RRTYPE_SVCB = 64, /*!< Service Binding. */
KNOT_RRTYPE_HTTPS = 65, /*!< HTTPS Binding. */
KNOT_RRTYPE_SPF = 99, /*!< Sender policy framework. */
KNOT_RRTYPE_NID = 104, /*!< Node identifier. */
KNOT_RRTYPE_L32 = 105, /*!< 32-bit network locator. */
KNOT_RRTYPE_L64 = 106, /*!< 64-bit network locator. */
KNOT_RRTYPE_LP = 107, /*!< Subnetwork name. */
KNOT_RRTYPE_EUI48 = 108, /*!< 48-bit extended unique identifier. */
KNOT_RRTYPE_EUI64 = 109, /*!< 64-bit extended unique identifier. */
KNOT_RRTYPE_TKEY = 249, /*!< METATYPE. Transaction key. */
KNOT_RRTYPE_TSIG = 250, /*!< METATYPE. Transaction signature. */
KNOT_RRTYPE_IXFR = 251, /*!< QTYPE. Incremental zone transfer. */
KNOT_RRTYPE_AXFR = 252, /*!< QTYPE. Authoritative zone transfer. */
KNOT_RRTYPE_ANY = 255, /*!< QTYPE. Any record. */
KNOT_RRTYPE_URI = 256, /*!< Uniform resource identifier. */
KNOT_RRTYPE_CAA = 257, /*!< Certification authority restriction. */
};
/*!
* \brief Some (OBSOLETE) resource record type constants.
*
* References:
* https://www.iana.org/assignments/dns-parameters/dns-parameters.xml
* RFC 3597#4
*
* \note These records can contain compressed domain name in rdata so
* it is important to know the position of them during transfers.
*/
enum knot_obsolete_rr_type {
KNOT_RRTYPE_MD = 3,
KNOT_RRTYPE_MF = 4,
KNOT_RRTYPE_MB = 7,
KNOT_RRTYPE_MG = 8,
KNOT_RRTYPE_MR = 9,
KNOT_RRTYPE_PX = 26,
KNOT_RRTYPE_NXT = 30
};
/*!
* \brief Constants characterising the wire format of RDATA items.
*/
enum knot_rdata_wireformat {
/*!< Dname must not be compressed. */
KNOT_RDATA_WF_FIXED_DNAME = -10,
/*!< Dname can be both compressed and decompressed. */
KNOT_RDATA_WF_COMPRESSIBLE_DNAME,
/*!< Dname can be decompressed. */
KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME,
/*!< Initial part of NAPTR record before dname. */
KNOT_RDATA_WF_NAPTR_HEADER,
/*!< Final part of a record. */
KNOT_RDATA_WF_REMAINDER,
/*!< The last descriptor in array. */
KNOT_RDATA_WF_END = 0
};
/*!
* \brief Structure describing rdata.
*/
typedef struct {
/*!< Item types describing rdata. */
const int block_types[KNOT_MAX_RDATA_BLOCKS];
/*!< RR type name. */
const char *type_name;
} knot_rdata_descriptor_t;
/*!
* \brief Gets rdata descriptor for given RR name.
*
* \param type Mnemonic of RR type whose descriptor should be returned.
*
* \retval RR descriptor for given name, NULL descriptor if
* unknown type.
*/
const knot_rdata_descriptor_t *knot_get_rdata_descriptor(const uint16_t type);
/*!
* \brief Gets rdata descriptor for given RR name (obsolete version).
*
* \param type Mnemonic of RR type whose descriptor should be returned.
*
* \retval RR descriptor for given name, NULL descriptor if
* unknown type.
*/
const knot_rdata_descriptor_t *knot_get_obsolete_rdata_descriptor(const uint16_t type);
/*!
* \brief Converts numeric type representation to mnemonic string.
*
* \param rrtype Type RR type code to be converted.
* \param out Output buffer.
* \param out_len Length of the output buffer.
*
* \retval Length of output string.
* \retval -1 if error.
*/
int knot_rrtype_to_string(const uint16_t rrtype,
char *out,
const size_t out_len);
/*!
* \brief Converts mnemonic string representation of a type to numeric one.
*
* \param name Mnemonic string to be converted.
* \param num Output variable.
*
* \retval 0 if OK.
* \retval -1 if error.
*/
int knot_rrtype_from_string(const char *name, uint16_t *num);
/*!
* \brief Converts numeric class representation to the string one.
*
* \param rrclass Class code to be converted.
* \param out Output buffer.
* \param out_len Length of the output buffer.
*
* \retval Length of output string.
* \retval -1 if error.
*/
int knot_rrclass_to_string(const uint16_t rrclass,
char *out,
const size_t out_len);
/*!
* \brief Converts string representation of a class to numeric one.
*
* \param name Mnemonic string to be converted.
* \param num Output variable.
*
* \retval 0 if OK.
* \retval -1 if error.
*/
int knot_rrclass_from_string(const char *name, uint16_t *num);
/*!
* \brief Checks if given item is one of metatypes or qtypes.
*
* \param type Item value.
*
* \retval > 0 if YES.
* \retval 0 if NO.
*/
int knot_rrtype_is_metatype(const uint16_t type);
/*!
* \brief Checks if given item is one of the DNSSEC types.
*
* \param type Item value.
*
* \retval > 0 if YES.
* \retval 0 if NO.
*/
int knot_rrtype_is_dnssec(const uint16_t type);
/*!
* \brief Checks whether the given type requires additional processing.
*
* Only MX, NS and SRV types require additional processing.
*
* \param type Type to check.
*
* \retval <> 0 if additional processing is needed for \a qtype.
* \retval 0 otherwise.
*/
int knot_rrtype_additional_needed(const uint16_t type);
/*!
* \brief Checks whether the RDATA domain names should be lowercased in
* canonical format of RRSet of the given type.
*
* Types that should be lowercased are according to RFC 4034, Section 6.2,
* except for NSEC (updated by RFC 6840, Section 5.1) and A6 (not supported).
*
* \param type RRSet type to check.
*
* \retval true If RDATA dnames for type should be lowercased in canonical format.
* \retval false Otherwise.
*/
bool knot_rrtype_should_be_lowercased(const uint16_t type);
/*!
* \brief Translates option code to string.
*
* \param code Code of the option to translate.
* \param out Buffer for the output string.
* \param out_len The available size of the buffer.
*
* \retval Length of output string.
* \retval -1 if error.
*/
int knot_opt_code_to_string(const uint16_t code, char *out, const size_t out_len);
/*! @} */
|
