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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 | ||
22 | #include "resolved-dns-question.h" | |
23 | #include "dns-domain.h" | |
24 | ||
25 | DnsQuestion *dns_question_new(unsigned n) { | |
26 | DnsQuestion *q; | |
27 | ||
28 | assert(n > 0); | |
29 | ||
30 | q = malloc0(offsetof(DnsQuestion, keys) + sizeof(DnsResourceKey*) * n); | |
31 | if (!q) | |
32 | return NULL; | |
33 | ||
34 | q->n_ref = 1; | |
35 | q->n_allocated = n; | |
36 | ||
37 | return q; | |
38 | } | |
39 | ||
40 | DnsQuestion *dns_question_ref(DnsQuestion *q) { | |
41 | if (!q) | |
42 | return NULL; | |
43 | ||
44 | assert(q->n_ref > 0); | |
45 | q->n_ref++; | |
46 | return q; | |
47 | } | |
48 | ||
49 | DnsQuestion *dns_question_unref(DnsQuestion *q) { | |
50 | if (!q) | |
51 | return NULL; | |
52 | ||
53 | assert(q->n_ref > 0); | |
54 | ||
55 | if (q->n_ref == 1) { | |
56 | unsigned i; | |
57 | ||
58 | for (i = 0; i < q->n_keys; i++) | |
59 | dns_resource_key_unref(q->keys[i]); | |
60 | free(q); | |
61 | } else | |
62 | q->n_ref--; | |
63 | ||
64 | return NULL; | |
65 | } | |
66 | ||
67 | int dns_question_add(DnsQuestion *q, DnsResourceKey *key) { | |
68 | unsigned i; | |
69 | int r; | |
70 | ||
71 | assert(key); | |
72 | ||
73 | if (!q) | |
74 | return -ENOSPC; | |
75 | ||
76 | for (i = 0; i < q->n_keys; i++) { | |
77 | r = dns_resource_key_equal(q->keys[i], key); | |
78 | if (r < 0) | |
79 | return r; | |
80 | if (r > 0) | |
81 | return 0; | |
82 | } | |
83 | ||
84 | if (q->n_keys >= q->n_allocated) | |
85 | return -ENOSPC; | |
86 | ||
87 | q->keys[q->n_keys++] = dns_resource_key_ref(key); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr) { | |
92 | unsigned i; | |
93 | int r; | |
94 | ||
95 | assert(rr); | |
96 | ||
97 | if (!q) | |
98 | return 0; | |
99 | ||
100 | for (i = 0; i < q->n_keys; i++) { | |
101 | r = dns_resource_key_match_rr(q->keys[i], rr); | |
102 | if (r != 0) | |
103 | return r; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr) { | |
110 | unsigned i; | |
111 | int r; | |
112 | ||
113 | assert(rr); | |
114 | ||
115 | if (!q) | |
116 | return 0; | |
117 | ||
118 | for (i = 0; i < q->n_keys; i++) { | |
119 | r = dns_resource_key_match_cname(q->keys[i], rr); | |
120 | if (r != 0) | |
121 | return r; | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | int dns_question_is_valid(DnsQuestion *q) { | |
128 | const char *name; | |
129 | unsigned i; | |
130 | int r; | |
131 | ||
132 | if (!q) | |
133 | return 0; | |
134 | ||
135 | if (q->n_keys <= 0) | |
136 | return 0; | |
137 | ||
138 | if (q->n_keys > 65535) | |
139 | return 0; | |
140 | ||
141 | name = DNS_RESOURCE_KEY_NAME(q->keys[0]); | |
142 | if (!name) | |
143 | return 0; | |
144 | ||
145 | /* Check that all keys in this question bear the same name */ | |
146 | for (i = 1; i < q->n_keys; i++) { | |
147 | assert(q->keys[i]); | |
148 | ||
149 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name); | |
150 | if (r <= 0) | |
151 | return r; | |
152 | } | |
153 | ||
154 | return 1; | |
155 | } | |
156 | ||
157 | int dns_question_is_superset(DnsQuestion *q, DnsQuestion *other) { | |
158 | unsigned j; | |
159 | int r; | |
160 | ||
161 | /* Checks if all keys in "other" are also contained in "q" */ | |
162 | ||
163 | if (!other) | |
164 | return 1; | |
165 | ||
166 | for (j = 0; j < other->n_keys; j++) { | |
167 | DnsResourceKey *b = other->keys[j]; | |
168 | bool found = false; | |
169 | unsigned i; | |
170 | ||
171 | if (!q) | |
172 | return 0; | |
173 | ||
174 | for (i = 0; i < q->n_keys; i++) { | |
175 | DnsResourceKey *a = q->keys[i]; | |
176 | ||
177 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b)); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | if (r == 0) | |
182 | continue; | |
183 | ||
184 | if (a->class != b->class && a->class != DNS_CLASS_ANY) | |
185 | continue; | |
186 | ||
187 | if (a->type != b->type && a->type != DNS_TYPE_ANY) | |
188 | continue; | |
189 | ||
190 | found = true; | |
191 | break; | |
192 | } | |
193 | ||
194 | if (!found) | |
195 | return 0; | |
196 | } | |
197 | ||
198 | return 1; | |
199 | } | |
200 | ||
201 | int dns_question_contains(DnsQuestion *a, DnsResourceKey *k) { | |
202 | unsigned j; | |
203 | int r; | |
204 | ||
205 | assert(k); | |
206 | ||
207 | if (!a) | |
208 | return 0; | |
209 | ||
210 | for (j = 0; j < a->n_keys; j++) { | |
211 | r = dns_resource_key_equal(a->keys[j], k); | |
212 | if (r != 0) | |
213 | return r; | |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) { | |
220 | unsigned j; | |
221 | int r; | |
222 | ||
223 | if (!a) | |
224 | return !b || b->n_keys == 0; | |
225 | if (!b) | |
226 | return a->n_keys == 0; | |
227 | ||
228 | /* Checks if all keys in a are also contained b, and vice versa */ | |
229 | ||
230 | for (j = 0; j < a->n_keys; j++) { | |
231 | r = dns_question_contains(b, a->keys[j]); | |
232 | if (r <= 0) | |
233 | return r; | |
234 | } | |
235 | ||
236 | for (j = 0; j < b->n_keys; j++) { | |
237 | r = dns_question_contains(a, b->keys[j]); | |
238 | if (r <= 0) | |
239 | return r; | |
240 | } | |
241 | ||
242 | return 1; | |
243 | } | |
244 | ||
245 | int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname, DnsQuestion **ret) { | |
246 | _cleanup_(dns_question_unrefp) DnsQuestion *n = NULL; | |
247 | bool same = true; | |
248 | unsigned i; | |
249 | int r; | |
250 | ||
251 | assert(cname); | |
252 | assert(ret); | |
253 | ||
254 | if (!q) { | |
255 | n = dns_question_new(0); | |
256 | if (!n) | |
257 | return -ENOMEM; | |
258 | ||
259 | *ret = n; | |
260 | n = 0; | |
261 | return 0; | |
262 | } | |
263 | ||
264 | for (i = 0; i < q->n_keys; i++) { | |
265 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), cname->cname.name); | |
266 | if (r < 0) | |
267 | return r; | |
268 | ||
269 | if (r == 0) { | |
270 | same = false; | |
271 | break; | |
272 | } | |
273 | } | |
274 | ||
275 | if (same) { | |
276 | /* Shortcut, the names are already right */ | |
277 | *ret = dns_question_ref(q); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | n = dns_question_new(q->n_keys); | |
282 | if (!n) | |
283 | return -ENOMEM; | |
284 | ||
285 | /* Create a new question, and patch in the new name */ | |
286 | for (i = 0; i < q->n_keys; i++) { | |
287 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL; | |
288 | ||
289 | k = dns_resource_key_new_redirect(q->keys[i], cname); | |
290 | if (!k) | |
291 | return -ENOMEM; | |
292 | ||
293 | r = dns_question_add(n, k); | |
294 | if (r < 0) | |
295 | return r; | |
296 | } | |
297 | ||
298 | *ret = n; | |
299 | n = NULL; | |
300 | ||
301 | return 1; | |
302 | } |