1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2014 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <netinet/in.h>
29 #include "in-addr-util.h"
32 typedef struct DnsResourceKey DnsResourceKey
;
33 typedef struct DnsResourceRecord DnsResourceRecord
;
34 typedef struct DnsTxtItem DnsTxtItem
;
37 #define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
38 #define DNSKEY_FLAG_REVOKE (UINT16_C(1) << 7)
39 #define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
42 #define MDNS_RR_CACHE_FLUSH (UINT16_C(1) << 15)
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 */
48 DNSSEC_ALGORITHM_RSAMD5
= 1,
52 DNSSEC_ALGORITHM_RSASHA1
,
53 DNSSEC_ALGORITHM_DSA_NSEC3_SHA1
,
54 DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1
,
55 DNSSEC_ALGORITHM_RSASHA256
= 8, /* RFC 5702 */
56 DNSSEC_ALGORITHM_RSASHA512
= 10, /* RFC 5702 */
57 DNSSEC_ALGORITHM_ECC_GOST
= 12, /* RFC 5933 */
58 DNSSEC_ALGORITHM_ECDSAP256SHA256
= 13, /* RFC 6605 */
59 DNSSEC_ALGORITHM_ECDSAP384SHA384
= 14, /* RFC 6605 */
60 DNSSEC_ALGORITHM_INDIRECT
= 252,
61 DNSSEC_ALGORITHM_PRIVATEDNS
,
62 DNSSEC_ALGORITHM_PRIVATEOID
,
63 _DNSSEC_ALGORITHM_MAX_DEFINED
66 /* DNSSEC digest identifiers, see
67 * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
69 DNSSEC_DIGEST_SHA1
= 1,
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 */
73 _DNSSEC_DIGEST_MAX_DEFINED
76 /* DNSSEC NSEC3 hash algorithms, see
77 * https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml */
79 NSEC3_ALGORITHM_SHA1
= 1,
80 _NSEC3_ALGORITHM_MAX_DEFINED
83 struct DnsResourceKey
{
84 unsigned n_ref
; /* (unsigned -1) for const keys, see below */
86 char *_name
; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
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) \
95 .n_ref = (unsigned) -1, \
104 LIST_FIELDS(DnsTxtItem
, items
);
108 struct DnsResourceRecord
{
115 usec_t expiry
; /* RRSIG signature expiry */
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
;
124 bool wire_format_canonical
:1;
126 size_t wire_format_size
;
127 size_t wire_format_rdata_offset
;
144 } ptr
, ns
, cname
, dname
;
156 struct in_addr in_addr
;
160 struct in6_addr in6_addr
;
178 /* https://tools.ietf.org/html/rfc1876 */
189 /* https://tools.ietf.org/html/rfc4255#section-3.1 */
194 size_t fingerprint_size
;
197 /* http://tools.ietf.org/html/rfc4034#section-2.1 */
206 /* http://tools.ietf.org/html/rfc4034#section-3.1 */
208 uint16_t type_covered
;
211 uint32_t original_ttl
;
217 size_t signature_size
;
220 /* https://tools.ietf.org/html/rfc4034#section-4.1 */
222 char *next_domain_name
;
226 /* https://tools.ietf.org/html/rfc4034#section-5.1 */
241 void *next_hashed_name
;
242 size_t next_hashed_name_size
;
248 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey
*key
) {
255 return (char*) key
+ sizeof(DnsResourceKey
);
258 static inline const void* DNS_RESOURCE_RECORD_RDATA(DnsResourceRecord
*rr
) {
262 if (!rr
->wire_format
)
265 assert(rr
->wire_format_rdata_offset
<= rr
->wire_format_size
);
266 return (uint8_t*) rr
->wire_format
+ rr
->wire_format_rdata_offset
;
269 static inline size_t DNS_RESOURCE_RECORD_RDATA_SIZE(DnsResourceRecord
*rr
) {
272 if (!rr
->wire_format
)
275 assert(rr
->wire_format_rdata_offset
<= rr
->wire_format_size
);
276 return rr
->wire_format_size
- rr
->wire_format_rdata_offset
;
279 DnsResourceKey
* dns_resource_key_new(uint16_t class, uint16_t type
, const char *name
);
280 DnsResourceKey
* dns_resource_key_new_redirect(const DnsResourceKey
*key
, const DnsResourceRecord
*cname
);
281 int dns_resource_key_new_append_suffix(DnsResourceKey
**ret
, DnsResourceKey
*key
, char *name
);
282 DnsResourceKey
* dns_resource_key_new_consume(uint16_t class, uint16_t type
, char *name
);
283 DnsResourceKey
* dns_resource_key_ref(DnsResourceKey
*key
);
284 DnsResourceKey
* dns_resource_key_unref(DnsResourceKey
*key
);
285 bool dns_resource_key_is_address(const DnsResourceKey
*key
);
286 int dns_resource_key_equal(const DnsResourceKey
*a
, const DnsResourceKey
*b
);
287 int dns_resource_key_match_rr(const DnsResourceKey
*key
, DnsResourceRecord
*rr
, const char *search_domain
);
288 int dns_resource_key_match_cname_or_dname(const DnsResourceKey
*key
, const DnsResourceKey
*cname
, const char *search_domain
);
289 int dns_resource_key_match_soa(const DnsResourceKey
*key
, const DnsResourceKey
*soa
);
290 int dns_resource_key_to_string(const DnsResourceKey
*key
, char **ret
);
291 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey
*, dns_resource_key_unref
);
293 static inline bool dns_key_is_shared(const DnsResourceKey
*key
) {
294 return IN_SET(key
->type
, DNS_TYPE_PTR
);
297 bool dns_resource_key_reduce(DnsResourceKey
**a
, DnsResourceKey
**b
);
299 DnsResourceRecord
* dns_resource_record_new(DnsResourceKey
*key
);
300 DnsResourceRecord
* dns_resource_record_new_full(uint16_t class, uint16_t type
, const char *name
);
301 DnsResourceRecord
* dns_resource_record_ref(DnsResourceRecord
*rr
);
302 DnsResourceRecord
* dns_resource_record_unref(DnsResourceRecord
*rr
);
303 int dns_resource_record_new_reverse(DnsResourceRecord
**ret
, int family
, const union in_addr_union
*address
, const char *name
);
304 int dns_resource_record_new_address(DnsResourceRecord
**ret
, int family
, const union in_addr_union
*address
, const char *name
);
305 int dns_resource_record_equal(const DnsResourceRecord
*a
, const DnsResourceRecord
*b
);
306 const char* dns_resource_record_to_string(DnsResourceRecord
*rr
);
307 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord
*, dns_resource_record_unref
);
309 int dns_resource_record_to_wire_format(DnsResourceRecord
*rr
, bool canonical
);
311 int dns_resource_record_signer(DnsResourceRecord
*rr
, const char **ret
);
312 int dns_resource_record_source(DnsResourceRecord
*rr
, const char **ret
);
313 int dns_resource_record_is_signer(DnsResourceRecord
*rr
, const char *zone
);
314 int dns_resource_record_is_synthetic(DnsResourceRecord
*rr
);
316 DnsTxtItem
*dns_txt_item_free_all(DnsTxtItem
*i
);
317 bool dns_txt_item_equal(DnsTxtItem
*a
, DnsTxtItem
*b
);
319 extern const struct hash_ops dns_resource_key_hash_ops
;
320 extern const struct hash_ops dns_resource_record_hash_ops
;
322 int dnssec_algorithm_to_string_alloc(int i
, char **ret
);
323 int dnssec_algorithm_from_string(const char *s
) _pure_
;
325 int dnssec_digest_to_string_alloc(int i
, char **ret
);
326 int dnssec_digest_from_string(const char *s
) _pure_
;