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74b2466e LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
322345fd | 22 | #include "resolved-dns-domain.h" |
74b2466e LP |
23 | #include "resolved-dns-rr.h" |
24 | ||
faa133f3 LP |
25 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) { |
26 | DnsResourceKey *k; | |
27 | size_t l; | |
74b2466e | 28 | |
faa133f3 LP |
29 | assert(name); |
30 | ||
31 | l = strlen(name); | |
32 | k = malloc0(sizeof(DnsResourceKey) + l + 1); | |
33 | if (!k) | |
34 | return NULL; | |
35 | ||
36 | k->n_ref = 1; | |
37 | k->class = class; | |
38 | k->type = type; | |
39 | ||
40 | strcpy((char*) k + sizeof(DnsResourceKey), name); | |
41 | ||
42 | return k; | |
43 | } | |
44 | ||
45 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) { | |
46 | DnsResourceKey *k; | |
47 | ||
48 | assert(name); | |
49 | ||
50 | k = new0(DnsResourceKey, 1); | |
51 | if (!k) | |
52 | return NULL; | |
53 | ||
54 | k->n_ref = 1; | |
55 | k->class = class; | |
56 | k->type = type; | |
57 | k->_name = name; | |
58 | ||
59 | return k; | |
60 | } | |
61 | ||
62 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) { | |
63 | ||
64 | if (!k) | |
65 | return NULL; | |
66 | ||
67 | assert(k->n_ref > 0); | |
68 | k->n_ref++; | |
69 | ||
70 | return k; | |
71 | } | |
72 | ||
73 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) { | |
74 | if (!k) | |
75 | return NULL; | |
76 | ||
77 | assert(k->n_ref > 0); | |
78 | ||
79 | if (k->n_ref == 1) { | |
80 | free(k->_name); | |
81 | free(k); | |
82 | } else | |
83 | k->n_ref--; | |
84 | ||
85 | return NULL; | |
86 | } | |
87 | ||
88 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { | |
89 | int r; | |
90 | ||
91 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b)); | |
92 | if (r <= 0) | |
93 | return r; | |
94 | ||
95 | if (a->class != b->class) | |
96 | return 0; | |
97 | ||
98 | if (a->type != b->type) | |
99 | return 0; | |
100 | ||
101 | return 1; | |
102 | } | |
103 | ||
104 | int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr) { | |
105 | assert(key); | |
106 | assert(rr); | |
107 | ||
108 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
109 | return 0; | |
110 | ||
111 | if (rr->key->type != key->type && key->type != DNS_TYPE_ANY) | |
112 | return 0; | |
113 | ||
114 | return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key)); | |
115 | } | |
116 | ||
117 | int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr) { | |
118 | assert(key); | |
119 | assert(rr); | |
120 | ||
121 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
122 | return 0; | |
123 | ||
124 | if (rr->key->type != DNS_TYPE_CNAME) | |
125 | return 0; | |
126 | ||
127 | return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key)); | |
74b2466e LP |
128 | } |
129 | ||
322345fd LP |
130 | unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]) { |
131 | const DnsResourceKey *k = i; | |
132 | unsigned long ul; | |
133 | ||
faa133f3 | 134 | ul = dns_name_hash_func(DNS_RESOURCE_KEY_NAME(k), hash_key); |
322345fd LP |
135 | ul = ul * hash_key[0] + ul + k->class; |
136 | ul = ul * hash_key[1] + ul + k->type; | |
137 | ||
138 | return ul; | |
139 | } | |
140 | ||
141 | int dns_resource_key_compare_func(const void *a, const void *b) { | |
142 | const DnsResourceKey *x = a, *y = b; | |
143 | int ret; | |
144 | ||
faa133f3 | 145 | ret = dns_name_compare_func(DNS_RESOURCE_KEY_NAME(x), DNS_RESOURCE_KEY_NAME(y)); |
322345fd LP |
146 | if (ret != 0) |
147 | return ret; | |
148 | ||
149 | if (x->type < y->type) | |
150 | return -1; | |
151 | if (x->type > y->type) | |
152 | return 1; | |
153 | ||
154 | if (x->class < y->class) | |
155 | return -1; | |
156 | if (x->class > y->class) | |
157 | return 1; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
faa133f3 | 162 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) { |
74b2466e LP |
163 | DnsResourceRecord *rr; |
164 | ||
165 | rr = new0(DnsResourceRecord, 1); | |
166 | if (!rr) | |
167 | return NULL; | |
168 | ||
169 | rr->n_ref = 1; | |
faa133f3 LP |
170 | rr->key = dns_resource_key_ref(key); |
171 | ||
74b2466e LP |
172 | return rr; |
173 | } | |
174 | ||
175 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) { | |
176 | if (!rr) | |
177 | return NULL; | |
178 | ||
179 | assert(rr->n_ref > 0); | |
180 | rr->n_ref++; | |
181 | ||
182 | return rr; | |
183 | } | |
184 | ||
185 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) { | |
186 | if (!rr) | |
187 | return NULL; | |
188 | ||
189 | assert(rr->n_ref > 0); | |
190 | ||
191 | if (rr->n_ref > 1) { | |
192 | rr->n_ref--; | |
193 | return NULL; | |
194 | } | |
195 | ||
faa133f3 LP |
196 | if (rr->key) { |
197 | if (IN_SET(rr->key->type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME)) | |
198 | free(rr->ptr.name); | |
199 | else if (rr->key->type == DNS_TYPE_HINFO) { | |
200 | free(rr->hinfo.cpu); | |
201 | free(rr->hinfo.os); | |
7e8e0422 LP |
202 | } else if (rr->key->type == DNS_TYPE_SOA) { |
203 | free(rr->soa.mname); | |
204 | free(rr->soa.rname); | |
faa133f3 LP |
205 | } else if (!IN_SET(rr->key->type, DNS_TYPE_A, DNS_TYPE_AAAA)) |
206 | free(rr->generic.data); | |
322345fd | 207 | |
faa133f3 LP |
208 | dns_resource_key_unref(rr->key); |
209 | } | |
322345fd | 210 | |
faa133f3 | 211 | free(rr); |
322345fd | 212 | |
322345fd LP |
213 | return NULL; |
214 | } | |
215 | ||
623a4c97 LP |
216 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) { |
217 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
218 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
219 | _cleanup_free_ char *ptr = NULL; | |
220 | int r; | |
221 | ||
222 | assert(ret); | |
223 | assert(address); | |
224 | assert(hostname); | |
225 | ||
226 | r = dns_name_reverse(family, address, &ptr); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr); | |
231 | if (!key) | |
232 | return -ENOMEM; | |
233 | ||
234 | ptr = NULL; | |
235 | ||
236 | rr = dns_resource_record_new(key); | |
237 | if (!rr) | |
238 | return -ENOMEM; | |
239 | ||
240 | rr->ptr.name = strdup(hostname); | |
241 | if (!rr->ptr.name) | |
242 | return -ENOMEM; | |
243 | ||
244 | *ret = rr; | |
245 | rr = NULL; | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
322345fd LP |
250 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { |
251 | int r; | |
252 | ||
253 | assert(a); | |
254 | assert(b); | |
255 | ||
faa133f3 | 256 | r = dns_resource_key_equal(a->key, b->key); |
322345fd LP |
257 | if (r <= 0) |
258 | return r; | |
259 | ||
faa133f3 | 260 | if (IN_SET(a->key->type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME)) |
322345fd | 261 | return dns_name_equal(a->ptr.name, b->ptr.name); |
faa133f3 | 262 | else if (a->key->type == DNS_TYPE_HINFO) |
322345fd LP |
263 | return strcasecmp(a->hinfo.cpu, b->hinfo.cpu) == 0 && |
264 | strcasecmp(a->hinfo.os, b->hinfo.os) == 0; | |
faa133f3 | 265 | else if (a->key->type == DNS_TYPE_A) |
322345fd | 266 | return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0; |
faa133f3 | 267 | else if (a->key->type == DNS_TYPE_AAAA) |
322345fd | 268 | return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0; |
7e8e0422 LP |
269 | else if (a->key->type == DNS_TYPE_SOA) { |
270 | r = dns_name_equal(a->soa.mname, b->soa.mname); | |
271 | if (r <= 0) | |
272 | return r; | |
273 | r = dns_name_equal(a->soa.rname, b->soa.rname); | |
274 | if (r <= 0) | |
275 | return r; | |
276 | ||
277 | return a->soa.serial == b->soa.serial && | |
278 | a->soa.refresh == b->soa.refresh && | |
279 | a->soa.retry == b->soa.retry && | |
280 | a->soa.expire == b->soa.expire && | |
281 | a->soa.minimum == b->soa.minimum; | |
282 | } else | |
322345fd LP |
283 | return a->generic.size == b->generic.size && |
284 | memcmp(a->generic.data, b->generic.data, a->generic.size) == 0; | |
285 | } | |
286 | ||
287 | const char *dns_class_to_string(uint16_t class) { | |
288 | ||
289 | switch (class) { | |
290 | ||
291 | case DNS_CLASS_IN: | |
292 | return "IN"; | |
293 | ||
294 | case DNS_CLASS_ANY: | |
295 | return "ANY"; | |
296 | } | |
297 | ||
298 | return NULL; | |
299 | } | |
300 | ||
301 | const char *dns_type_to_string(uint16_t type) { | |
302 | ||
303 | switch (type) { | |
304 | ||
305 | case DNS_TYPE_A: | |
306 | return "A"; | |
307 | ||
308 | case DNS_TYPE_NS: | |
309 | return "NS"; | |
310 | ||
311 | case DNS_TYPE_CNAME: | |
312 | return "CNAME"; | |
313 | ||
314 | case DNS_TYPE_SOA: | |
315 | return "SOA"; | |
316 | ||
317 | case DNS_TYPE_PTR: | |
318 | return "PTR"; | |
319 | ||
320 | case DNS_TYPE_HINFO: | |
321 | return "HINFO"; | |
322 | ||
323 | case DNS_TYPE_MX: | |
324 | return "MX"; | |
325 | ||
326 | case DNS_TYPE_TXT: | |
327 | return "TXT"; | |
328 | ||
329 | case DNS_TYPE_AAAA: | |
330 | return "AAAA"; | |
331 | ||
332 | case DNS_TYPE_SRV: | |
333 | return "SRV"; | |
334 | ||
335 | case DNS_TYPE_SSHFP: | |
336 | return "SSHFP"; | |
337 | ||
338 | case DNS_TYPE_DNAME: | |
339 | return "DNAME"; | |
340 | ||
341 | case DNS_TYPE_ANY: | |
342 | return "ANY"; | |
343 | ||
344 | case DNS_TYPE_OPT: | |
345 | return "OPT"; | |
346 | ||
347 | case DNS_TYPE_TKEY: | |
348 | return "TKEY"; | |
349 | ||
350 | case DNS_TYPE_TSIG: | |
351 | return "TSIG"; | |
352 | ||
353 | case DNS_TYPE_IXFR: | |
354 | return "IXFR"; | |
355 | ||
356 | case DNS_TYPE_AXFR: | |
357 | return "AXFR"; | |
358 | } | |
359 | ||
360 | return NULL; | |
361 | } |