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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
74b2466e LP |
2 | #pragma once |
3 | ||
4 | /*** | |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2014 Lennart Poettering | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
74b2466e LP |
23 | #include <netinet/in.h> |
24 | ||
50f1e641 | 25 | #include "bitmap.h" |
71d35b6b | 26 | #include "dns-type.h" |
322345fd | 27 | #include "hashmap.h" |
623a4c97 | 28 | #include "in-addr-util.h" |
2001c805 | 29 | #include "list.h" |
1c02e7ba | 30 | #include "string-util.h" |
74b2466e LP |
31 | |
32 | typedef struct DnsResourceKey DnsResourceKey; | |
33 | typedef struct DnsResourceRecord DnsResourceRecord; | |
2001c805 | 34 | typedef struct DnsTxtItem DnsTxtItem; |
74b2466e | 35 | |
8730bccf | 36 | /* DNSKEY RR flags */ |
8730bccf | 37 | #define DNSKEY_FLAG_SEP (UINT16_C(1) << 0) |
28b8191e LP |
38 | #define DNSKEY_FLAG_REVOKE (UINT16_C(1) << 7) |
39 | #define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8) | |
8730bccf | 40 | |
23502de3 DM |
41 | /* mDNS RR flags */ |
42 | #define MDNS_RR_CACHE_FLUSH (UINT16_C(1) << 15) | |
43 | ||
8730bccf LP |
44 | /* DNSSEC algorithm identifiers, see |
45 | * http://tools.ietf.org/html/rfc4034#appendix-A.1 and | |
46 | * https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */ | |
47 | enum { | |
48 | DNSSEC_ALGORITHM_RSAMD5 = 1, | |
49 | DNSSEC_ALGORITHM_DH, | |
50 | DNSSEC_ALGORITHM_DSA, | |
51 | DNSSEC_ALGORITHM_ECC, | |
52 | DNSSEC_ALGORITHM_RSASHA1, | |
53 | DNSSEC_ALGORITHM_DSA_NSEC3_SHA1, | |
54 | DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1, | |
6f717d08 LP |
55 | DNSSEC_ALGORITHM_RSASHA256 = 8, /* RFC 5702 */ |
56 | DNSSEC_ALGORITHM_RSASHA512 = 10, /* RFC 5702 */ | |
57 | DNSSEC_ALGORITHM_ECC_GOST = 12, /* RFC 5933 */ | |
e0240c64 LP |
58 | DNSSEC_ALGORITHM_ECDSAP256SHA256 = 13, /* RFC 6605 */ |
59 | DNSSEC_ALGORITHM_ECDSAP384SHA384 = 14, /* RFC 6605 */ | |
8730bccf LP |
60 | DNSSEC_ALGORITHM_INDIRECT = 252, |
61 | DNSSEC_ALGORITHM_PRIVATEDNS, | |
62 | DNSSEC_ALGORITHM_PRIVATEOID, | |
63 | _DNSSEC_ALGORITHM_MAX_DEFINED | |
64 | }; | |
65 | ||
66 | /* DNSSEC digest identifiers, see | |
67 | * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */ | |
68 | enum { | |
69 | DNSSEC_DIGEST_SHA1 = 1, | |
6f717d08 LP |
70 | DNSSEC_DIGEST_SHA256 = 2, /* RFC 4509 */ |
71 | DNSSEC_DIGEST_GOST_R_34_11_94 = 3, /* RFC 5933 */ | |
72 | DNSSEC_DIGEST_SHA384 = 4, /* RFC 6605 */ | |
8730bccf LP |
73 | _DNSSEC_DIGEST_MAX_DEFINED |
74 | }; | |
75 | ||
d15ad742 LP |
76 | /* DNSSEC NSEC3 hash algorithms, see |
77 | * https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml */ | |
78 | enum { | |
79 | NSEC3_ALGORITHM_SHA1 = 1, | |
80 | _NSEC3_ALGORITHM_MAX_DEFINED | |
81 | }; | |
82 | ||
74b2466e | 83 | struct DnsResourceKey { |
f57e3cd5 | 84 | unsigned n_ref; /* (unsigned -1) for const keys, see below */ |
faa133f3 | 85 | uint16_t class, type; |
96d49011 | 86 | char *_name; /* don't access directly, use dns_resource_key_name()! */ |
74b2466e LP |
87 | }; |
88 | ||
1b4f6e79 LP |
89 | /* Creates a temporary resource key. This is only useful to quickly |
90 | * look up something, without allocating a full DnsResourceKey object | |
91 | * for it. Note that it is not OK to take references to this kind of | |
92 | * resource key object. */ | |
93 | #define DNS_RESOURCE_KEY_CONST(c, t, n) \ | |
94 | ((DnsResourceKey) { \ | |
95 | .n_ref = (unsigned) -1, \ | |
96 | .class = c, \ | |
97 | .type = t, \ | |
98 | ._name = (char*) n, \ | |
99 | }) | |
100 | ||
101 | ||
2001c805 LP |
102 | struct DnsTxtItem { |
103 | size_t length; | |
104 | LIST_FIELDS(DnsTxtItem, items); | |
105 | uint8_t data[]; | |
106 | }; | |
107 | ||
74b2466e LP |
108 | struct DnsResourceRecord { |
109 | unsigned n_ref; | |
faa133f3 | 110 | DnsResourceKey *key; |
97c67192 | 111 | |
7b50eb2e | 112 | char *to_string; |
97c67192 | 113 | |
74b2466e | 114 | uint32_t ttl; |
ee3d6aff | 115 | usec_t expiry; /* RRSIG signature expiry */ |
97c67192 LP |
116 | |
117 | /* How many labels to strip to determine "signer" of the RRSIG (aka, the zone). -1 if not signed. */ | |
118 | unsigned n_skip_labels_signer; | |
119 | /* How many labels to strip to determine "synthesizing source" of this RR, i.e. the wildcard's immediate parent. -1 if not signed. */ | |
120 | unsigned n_skip_labels_source; | |
121 | ||
a8812dd7 | 122 | bool unparseable:1; |
97c67192 | 123 | |
a8812dd7 LP |
124 | bool wire_format_canonical:1; |
125 | void *wire_format; | |
126 | size_t wire_format_size; | |
127 | size_t wire_format_rdata_offset; | |
97c67192 | 128 | |
74b2466e LP |
129 | union { |
130 | struct { | |
131 | void *data; | |
a43a068a | 132 | size_t data_size; |
d75acfb0 | 133 | } generic, opt; |
74b2466e | 134 | |
9c92ce6d LP |
135 | struct { |
136 | uint16_t priority; | |
137 | uint16_t weight; | |
138 | uint16_t port; | |
139 | char *name; | |
140 | } srv; | |
74b2466e LP |
141 | |
142 | struct { | |
143 | char *name; | |
8ac4e9e1 | 144 | } ptr, ns, cname, dname; |
74b2466e LP |
145 | |
146 | struct { | |
147 | char *cpu; | |
148 | char *os; | |
149 | } hinfo; | |
150 | ||
2e276efc | 151 | struct { |
2001c805 | 152 | DnsTxtItem *items; |
c0eb11cf | 153 | } txt, spf; |
74b2466e LP |
154 | |
155 | struct { | |
156 | struct in_addr in_addr; | |
157 | } a; | |
158 | ||
159 | struct { | |
160 | struct in6_addr in6_addr; | |
161 | } aaaa; | |
7e8e0422 LP |
162 | |
163 | struct { | |
164 | char *mname; | |
165 | char *rname; | |
166 | uint32_t serial; | |
167 | uint32_t refresh; | |
168 | uint32_t retry; | |
169 | uint32_t expire; | |
170 | uint32_t minimum; | |
171 | } soa; | |
946c7094 ZJS |
172 | |
173 | struct { | |
174 | uint16_t priority; | |
175 | char *exchange; | |
176 | } mx; | |
0dae31d4 | 177 | |
6af47493 | 178 | /* https://tools.ietf.org/html/rfc1876 */ |
0dae31d4 ZJS |
179 | struct { |
180 | uint8_t version; | |
181 | uint8_t size; | |
182 | uint8_t horiz_pre; | |
183 | uint8_t vert_pre; | |
184 | uint32_t latitude; | |
185 | uint32_t longitude; | |
186 | uint32_t altitude; | |
187 | } loc; | |
42cc2eeb | 188 | |
549c1a25 | 189 | /* https://tools.ietf.org/html/rfc4255#section-3.1 */ |
42cc2eeb LP |
190 | struct { |
191 | uint8_t algorithm; | |
192 | uint8_t fptype; | |
549c1a25 TG |
193 | void *fingerprint; |
194 | size_t fingerprint_size; | |
42cc2eeb | 195 | } sshfp; |
8db0d2f5 ZJS |
196 | |
197 | /* http://tools.ietf.org/html/rfc4034#section-2.1 */ | |
198 | struct { | |
f91dc240 LP |
199 | uint16_t flags; |
200 | uint8_t protocol; | |
8db0d2f5 ZJS |
201 | uint8_t algorithm; |
202 | void* key; | |
203 | size_t key_size; | |
204 | } dnskey; | |
151226ab ZJS |
205 | |
206 | /* http://tools.ietf.org/html/rfc4034#section-3.1 */ | |
207 | struct { | |
208 | uint16_t type_covered; | |
209 | uint8_t algorithm; | |
210 | uint8_t labels; | |
211 | uint32_t original_ttl; | |
212 | uint32_t expiration; | |
213 | uint32_t inception; | |
214 | uint16_t key_tag; | |
215 | char *signer; | |
216 | void *signature; | |
217 | size_t signature_size; | |
218 | } rrsig; | |
50f1e641 | 219 | |
9ead3519 | 220 | /* https://tools.ietf.org/html/rfc4034#section-4.1 */ |
50f1e641 TG |
221 | struct { |
222 | char *next_domain_name; | |
223 | Bitmap *types; | |
224 | } nsec; | |
5d45a880 | 225 | |
6af47493 LP |
226 | /* https://tools.ietf.org/html/rfc4034#section-5.1 */ |
227 | struct { | |
228 | uint16_t key_tag; | |
229 | uint8_t algorithm; | |
230 | uint8_t digest_type; | |
231 | void *digest; | |
232 | size_t digest_size; | |
233 | } ds; | |
234 | ||
5d45a880 TG |
235 | struct { |
236 | uint8_t algorithm; | |
237 | uint8_t flags; | |
238 | uint16_t iterations; | |
239 | void *salt; | |
240 | size_t salt_size; | |
241 | void *next_hashed_name; | |
242 | size_t next_hashed_name_size; | |
243 | Bitmap *types; | |
244 | } nsec3; | |
48d45d2b ZJS |
245 | |
246 | /* https://tools.ietf.org/html/draft-ietf-dane-protocol-23 */ | |
247 | struct { | |
248 | uint8_t cert_usage; | |
249 | uint8_t selector; | |
250 | uint8_t matching_type; | |
251 | void *data; | |
252 | size_t data_size; | |
253 | } tlsa; | |
95052df3 ZJS |
254 | |
255 | /* https://tools.ietf.org/html/rfc6844 */ | |
256 | struct { | |
257 | uint8_t flags; | |
258 | char *tag; | |
259 | void *value; | |
260 | size_t value_size; | |
261 | } caa; | |
74b2466e LP |
262 | }; |
263 | }; | |
264 | ||
85aeaccc LP |
265 | static inline const void* DNS_RESOURCE_RECORD_RDATA(DnsResourceRecord *rr) { |
266 | if (!rr) | |
267 | return NULL; | |
268 | ||
269 | if (!rr->wire_format) | |
270 | return NULL; | |
271 | ||
272 | assert(rr->wire_format_rdata_offset <= rr->wire_format_size); | |
273 | return (uint8_t*) rr->wire_format + rr->wire_format_rdata_offset; | |
274 | } | |
275 | ||
276 | static inline size_t DNS_RESOURCE_RECORD_RDATA_SIZE(DnsResourceRecord *rr) { | |
277 | if (!rr) | |
278 | return 0; | |
279 | if (!rr->wire_format) | |
280 | return 0; | |
281 | ||
282 | assert(rr->wire_format_rdata_offset <= rr->wire_format_size); | |
283 | return rr->wire_format_size - rr->wire_format_rdata_offset; | |
284 | } | |
285 | ||
b30bf55d LP |
286 | static inline uint8_t DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(DnsResourceRecord *rr) { |
287 | assert(rr); | |
288 | assert(rr->key->type == DNS_TYPE_OPT); | |
289 | ||
290 | return ((rr->ttl >> 16) & 0xFF) == 0; | |
291 | } | |
292 | ||
faa133f3 | 293 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name); |
36d9205d | 294 | DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname); |
801ad6a6 | 295 | int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name); |
faa133f3 LP |
296 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name); |
297 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key); | |
298 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key); | |
1c02e7ba | 299 | const char* dns_resource_key_name(const DnsResourceKey *key); |
28b9b764 | 300 | bool dns_resource_key_is_address(const DnsResourceKey *key); |
faa133f3 | 301 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b); |
105e1512 | 302 | int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain); |
5d27351f | 303 | int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain); |
547973de | 304 | int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa); |
202b76ae ZJS |
305 | |
306 | /* _DNS_{CLASS,TYPE}_STRING_MAX include one byte for NUL, which we use for space instead below. | |
307 | * DNS_HOSTNAME_MAX does not include the NUL byte, so we need to add 1. */ | |
308 | #define DNS_RESOURCE_KEY_STRING_MAX (_DNS_CLASS_STRING_MAX + _DNS_TYPE_STRING_MAX + DNS_HOSTNAME_MAX + 1) | |
309 | ||
310 | char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size); | |
2e74028a ZJS |
311 | ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out); |
312 | ||
faa133f3 | 313 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref); |
322345fd | 314 | |
7778dfff DM |
315 | static inline bool dns_key_is_shared(const DnsResourceKey *key) { |
316 | return IN_SET(key->type, DNS_TYPE_PTR); | |
317 | } | |
318 | ||
f57e3cd5 LP |
319 | bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b); |
320 | ||
faa133f3 | 321 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key); |
8bf52d3d | 322 | DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name); |
74b2466e LP |
323 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr); |
324 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr); | |
623a4c97 | 325 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name); |
78c6a153 | 326 | int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name); |
322345fd | 327 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b); |
7b50eb2e | 328 | const char* dns_resource_record_to_string(DnsResourceRecord *rr); |
17c8de63 | 329 | DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr); |
faa133f3 | 330 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref); |
322345fd | 331 | |
a8812dd7 LP |
332 | int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical); |
333 | ||
97c67192 LP |
334 | int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret); |
335 | int dns_resource_record_source(DnsResourceRecord *rr, const char **ret); | |
336 | int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone); | |
ab481675 | 337 | int dns_resource_record_is_synthetic(DnsResourceRecord *rr); |
97c67192 | 338 | |
17c8de63 LP |
339 | int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl); |
340 | ||
2001c805 LP |
341 | DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i); |
342 | bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b); | |
17c8de63 | 343 | DnsTxtItem *dns_txt_item_copy(DnsTxtItem *i); |
2001c805 | 344 | |
6d99904f ZJS |
345 | void dns_resource_record_hash_func(const void *i, struct siphash *state); |
346 | ||
d5099efc | 347 | extern const struct hash_ops dns_resource_key_hash_ops; |
c9c72065 | 348 | extern const struct hash_ops dns_resource_record_hash_ops; |
8730bccf | 349 | |
8e54f5d9 | 350 | int dnssec_algorithm_to_string_alloc(int i, char **ret); |
8730bccf LP |
351 | int dnssec_algorithm_from_string(const char *s) _pure_; |
352 | ||
8e54f5d9 | 353 | int dnssec_digest_to_string_alloc(int i, char **ret); |
8730bccf | 354 | int dnssec_digest_from_string(const char *s) _pure_; |