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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | #pragma once | |
4 | ||
5 | /*** | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2014 Lennart Poettering | |
9 | ||
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. | |
14 | ||
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. | |
19 | ||
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/>. | |
22 | ***/ | |
23 | ||
24 | #include <netinet/in.h> | |
25 | ||
26 | #include "bitmap.h" | |
27 | #include "dns-type.h" | |
28 | #include "hashmap.h" | |
29 | #include "in-addr-util.h" | |
30 | #include "list.h" | |
31 | ||
32 | typedef struct DnsResourceKey DnsResourceKey; | |
33 | typedef struct DnsResourceRecord DnsResourceRecord; | |
34 | typedef struct DnsTxtItem DnsTxtItem; | |
35 | ||
36 | /* DNS record classes, see RFC 1035 */ | |
37 | enum { | |
38 | DNS_CLASS_IN = 0x01, | |
39 | DNS_CLASS_ANY = 0xFF, | |
40 | _DNS_CLASS_MAX, | |
41 | _DNS_CLASS_INVALID = -1 | |
42 | }; | |
43 | ||
44 | /* DNSKEY RR flags */ | |
45 | #define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8) | |
46 | #define DNSKEY_FLAG_SEP (UINT16_C(1) << 0) | |
47 | ||
48 | /* mDNS RR flags */ | |
49 | #define MDNS_RR_CACHE_FLUSH (UINT16_C(1) << 15) | |
50 | ||
51 | /* DNSSEC algorithm identifiers, see | |
52 | * http://tools.ietf.org/html/rfc4034#appendix-A.1 and | |
53 | * https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */ | |
54 | enum { | |
55 | DNSSEC_ALGORITHM_RSAMD5 = 1, | |
56 | DNSSEC_ALGORITHM_DH, | |
57 | DNSSEC_ALGORITHM_DSA, | |
58 | DNSSEC_ALGORITHM_ECC, | |
59 | DNSSEC_ALGORITHM_RSASHA1, | |
60 | DNSSEC_ALGORITHM_DSA_NSEC3_SHA1, | |
61 | DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1, | |
62 | DNSSEC_ALGORITHM_RSASHA256 = 8, /* RFC 5702 */ | |
63 | DNSSEC_ALGORITHM_RSASHA512 = 10, /* RFC 5702 */ | |
64 | DNSSEC_ALGORITHM_INDIRECT = 252, | |
65 | DNSSEC_ALGORITHM_PRIVATEDNS, | |
66 | DNSSEC_ALGORITHM_PRIVATEOID, | |
67 | _DNSSEC_ALGORITHM_MAX_DEFINED | |
68 | }; | |
69 | ||
70 | /* DNSSEC digest identifiers, see | |
71 | * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */ | |
72 | enum { | |
73 | DNSSEC_DIGEST_SHA1 = 1, | |
74 | DNSSEC_DIGEST_SHA256 = 2, | |
75 | _DNSSEC_DIGEST_MAX_DEFINED | |
76 | }; | |
77 | ||
78 | struct DnsResourceKey { | |
79 | unsigned n_ref; | |
80 | uint16_t class, type; | |
81 | char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */ | |
82 | bool cache_flush:1; | |
83 | }; | |
84 | ||
85 | /* Creates a temporary resource key. This is only useful to quickly | |
86 | * look up something, without allocating a full DnsResourceKey object | |
87 | * for it. Note that it is not OK to take references to this kind of | |
88 | * resource key object. */ | |
89 | #define DNS_RESOURCE_KEY_CONST(c, t, n) \ | |
90 | ((DnsResourceKey) { \ | |
91 | .n_ref = (unsigned) -1, \ | |
92 | .class = c, \ | |
93 | .type = t, \ | |
94 | ._name = (char*) n, \ | |
95 | }) | |
96 | ||
97 | ||
98 | struct DnsTxtItem { | |
99 | size_t length; | |
100 | LIST_FIELDS(DnsTxtItem, items); | |
101 | uint8_t data[]; | |
102 | }; | |
103 | ||
104 | struct DnsResourceRecord { | |
105 | unsigned n_ref; | |
106 | DnsResourceKey *key; | |
107 | uint32_t ttl; | |
108 | bool unparseable:1; | |
109 | bool wire_format_canonical:1; | |
110 | void *wire_format; | |
111 | size_t wire_format_size; | |
112 | size_t wire_format_rdata_offset; | |
113 | union { | |
114 | struct { | |
115 | void *data; | |
116 | size_t size; | |
117 | } generic, opt; | |
118 | ||
119 | struct { | |
120 | uint16_t priority; | |
121 | uint16_t weight; | |
122 | uint16_t port; | |
123 | char *name; | |
124 | } srv; | |
125 | ||
126 | struct { | |
127 | char *name; | |
128 | } ptr, ns, cname, dname; | |
129 | ||
130 | struct { | |
131 | char *cpu; | |
132 | char *os; | |
133 | } hinfo; | |
134 | ||
135 | struct { | |
136 | DnsTxtItem *items; | |
137 | } txt, spf; | |
138 | ||
139 | struct { | |
140 | struct in_addr in_addr; | |
141 | } a; | |
142 | ||
143 | struct { | |
144 | struct in6_addr in6_addr; | |
145 | } aaaa; | |
146 | ||
147 | struct { | |
148 | char *mname; | |
149 | char *rname; | |
150 | uint32_t serial; | |
151 | uint32_t refresh; | |
152 | uint32_t retry; | |
153 | uint32_t expire; | |
154 | uint32_t minimum; | |
155 | } soa; | |
156 | ||
157 | struct { | |
158 | uint16_t priority; | |
159 | char *exchange; | |
160 | } mx; | |
161 | ||
162 | struct { | |
163 | uint8_t version; | |
164 | uint8_t size; | |
165 | uint8_t horiz_pre; | |
166 | uint8_t vert_pre; | |
167 | uint32_t latitude; | |
168 | uint32_t longitude; | |
169 | uint32_t altitude; | |
170 | } loc; | |
171 | ||
172 | struct { | |
173 | uint16_t key_tag; | |
174 | uint8_t algorithm; | |
175 | uint8_t digest_type; | |
176 | void *digest; | |
177 | size_t digest_size; | |
178 | } ds; | |
179 | ||
180 | /* https://tools.ietf.org/html/rfc4255#section-3.1 */ | |
181 | struct { | |
182 | uint8_t algorithm; | |
183 | uint8_t fptype; | |
184 | void *fingerprint; | |
185 | size_t fingerprint_size; | |
186 | } sshfp; | |
187 | ||
188 | /* http://tools.ietf.org/html/rfc4034#section-2.1 */ | |
189 | struct { | |
190 | uint16_t flags; | |
191 | uint8_t protocol; | |
192 | uint8_t algorithm; | |
193 | void* key; | |
194 | size_t key_size; | |
195 | } dnskey; | |
196 | ||
197 | /* http://tools.ietf.org/html/rfc4034#section-3.1 */ | |
198 | struct { | |
199 | uint16_t type_covered; | |
200 | uint8_t algorithm; | |
201 | uint8_t labels; | |
202 | uint32_t original_ttl; | |
203 | uint32_t expiration; | |
204 | uint32_t inception; | |
205 | uint16_t key_tag; | |
206 | char *signer; | |
207 | void *signature; | |
208 | size_t signature_size; | |
209 | } rrsig; | |
210 | ||
211 | /* https://tools.ietf.org/html/rfc4034#section-4.1 */ | |
212 | struct { | |
213 | char *next_domain_name; | |
214 | Bitmap *types; | |
215 | } nsec; | |
216 | ||
217 | struct { | |
218 | uint8_t algorithm; | |
219 | uint8_t flags; | |
220 | uint16_t iterations; | |
221 | void *salt; | |
222 | size_t salt_size; | |
223 | void *next_hashed_name; | |
224 | size_t next_hashed_name_size; | |
225 | Bitmap *types; | |
226 | } nsec3; | |
227 | }; | |
228 | }; | |
229 | ||
230 | static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) { | |
231 | if (_unlikely_(!key)) | |
232 | return NULL; | |
233 | ||
234 | if (key->_name) | |
235 | return key->_name; | |
236 | ||
237 | return (char*) key + sizeof(DnsResourceKey); | |
238 | } | |
239 | ||
240 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name); | |
241 | DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname); | |
242 | int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name); | |
243 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name); | |
244 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key); | |
245 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key); | |
246 | bool dns_resource_key_is_address(const DnsResourceKey *key); | |
247 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b); | |
248 | int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain); | |
249 | int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain); | |
250 | int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa); | |
251 | int dns_resource_key_to_string(const DnsResourceKey *key, char **ret); | |
252 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref); | |
253 | ||
254 | static inline bool dns_key_is_shared(const DnsResourceKey *key) { | |
255 | return IN_SET(key->type, DNS_TYPE_PTR); | |
256 | } | |
257 | ||
258 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key); | |
259 | DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name); | |
260 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr); | |
261 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr); | |
262 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name); | |
263 | int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name); | |
264 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b); | |
265 | int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret); | |
266 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref); | |
267 | ||
268 | int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical); | |
269 | ||
270 | DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i); | |
271 | bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b); | |
272 | ||
273 | const char *dns_class_to_string(uint16_t type); | |
274 | int dns_class_from_string(const char *name, uint16_t *class); | |
275 | ||
276 | extern const struct hash_ops dns_resource_key_hash_ops; | |
277 | ||
278 | const char* dnssec_algorithm_to_string(int i) _const_; | |
279 | int dnssec_algorithm_from_string(const char *s) _pure_; | |
280 | ||
281 | const char *dnssec_digest_to_string(int i) _const_; | |
282 | int dnssec_digest_from_string(const char *s) _pure_; |