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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
7263f724 ZJS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2014 Zbigniew Jędrzejewski-Szmek | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
d07b43a1 | 21 | #include <sys/socket.h> |
dccca82b | 22 | #include <errno.h> |
d07b43a1 | 23 | |
7263f724 | 24 | #include "dns-type.h" |
869b3b67 | 25 | #include "parse-util.h" |
4b548ef3 | 26 | #include "string-util.h" |
7263f724 ZJS |
27 | |
28 | typedef const struct { | |
29 | uint16_t type; | |
30 | const char *name; | |
31 | } dns_type; | |
32 | ||
33 | static const struct dns_type_name * | |
c9f7b4d3 | 34 | lookup_dns_type (register const char *str, register GPERF_LEN_TYPE len); |
7263f724 ZJS |
35 | |
36 | #include "dns_type-from-name.h" | |
37 | #include "dns_type-to-name.h" | |
38 | ||
de292aa1 | 39 | int dns_type_from_string(const char *s) { |
7263f724 ZJS |
40 | const struct dns_type_name *sc; |
41 | ||
42 | assert(s); | |
7263f724 ZJS |
43 | |
44 | sc = lookup_dns_type(s, strlen(s)); | |
869b3b67 ZJS |
45 | if (sc) |
46 | return sc->id; | |
7263f724 | 47 | |
869b3b67 ZJS |
48 | s = startswith_no_case(s, "TYPE"); |
49 | if (s) { | |
50 | unsigned x; | |
51 | ||
52 | if (safe_atou(s, &x) >= 0 && | |
53 | x <= UINT16_MAX) | |
54 | return (int) x; | |
55 | } | |
56 | ||
57 | return _DNS_TYPE_INVALID; | |
7263f724 | 58 | } |
8e6edc49 | 59 | |
bea4c76f LP |
60 | bool dns_type_is_pseudo(uint16_t type) { |
61 | ||
62 | /* Checks whether the specified type is a "pseudo-type". What | |
63 | * a "pseudo-type" precisely is, is defined only very weakly, | |
64 | * but apparently entails all RR types that are not actually | |
65 | * stored as RRs on the server and should hence also not be | |
66 | * cached. We use this list primarily to validate NSEC type | |
c33be4a6 | 67 | * bitfields, and to verify what to cache. */ |
bea4c76f LP |
68 | |
69 | return IN_SET(type, | |
70 | 0, /* A Pseudo RR type, according to RFC 2931 */ | |
71 | DNS_TYPE_ANY, | |
72 | DNS_TYPE_AXFR, | |
73 | DNS_TYPE_IXFR, | |
74 | DNS_TYPE_OPT, | |
75 | DNS_TYPE_TSIG, | |
76 | DNS_TYPE_TKEY | |
77 | ); | |
8e6edc49 | 78 | } |
c463eb78 | 79 | |
4b548ef3 LP |
80 | bool dns_class_is_pseudo(uint16_t class) { |
81 | return class == DNS_TYPE_ANY; | |
82 | } | |
83 | ||
c463eb78 LP |
84 | bool dns_type_is_valid_query(uint16_t type) { |
85 | ||
86 | /* The types valid as questions in packets */ | |
87 | ||
88 | return !IN_SET(type, | |
89 | 0, | |
90 | DNS_TYPE_OPT, | |
91 | DNS_TYPE_TSIG, | |
04680e36 LP |
92 | DNS_TYPE_TKEY, |
93 | ||
94 | /* RRSIG are technically valid as questions, but we refuse doing explicit queries for them, as | |
95 | * they aren't really payload, but signatures for payload, and cannot be validated on their | |
96 | * own. After all they are the signatures, and have no signatures of their own validating | |
97 | * them. */ | |
98 | DNS_TYPE_RRSIG); | |
c463eb78 LP |
99 | } |
100 | ||
6ebd1e33 LP |
101 | bool dns_type_is_zone_transer(uint16_t type) { |
102 | ||
103 | /* Zone transfers, either normal or incremental */ | |
104 | ||
105 | return IN_SET(type, | |
106 | DNS_TYPE_AXFR, | |
107 | DNS_TYPE_IXFR); | |
108 | } | |
109 | ||
c463eb78 LP |
110 | bool dns_type_is_valid_rr(uint16_t type) { |
111 | ||
112 | /* The types valid as RR in packets (but not necessarily | |
113 | * stored on servers). */ | |
114 | ||
115 | return !IN_SET(type, | |
116 | DNS_TYPE_ANY, | |
117 | DNS_TYPE_AXFR, | |
118 | DNS_TYPE_IXFR); | |
119 | } | |
4b548ef3 LP |
120 | |
121 | bool dns_class_is_valid_rr(uint16_t class) { | |
122 | return class != DNS_CLASS_ANY; | |
123 | } | |
124 | ||
d3c7e913 LP |
125 | bool dns_type_may_redirect(uint16_t type) { |
126 | /* The following record types should never be redirected using | |
127 | * CNAME/DNAME RRs. See | |
128 | * <https://tools.ietf.org/html/rfc4035#section-2.5>. */ | |
129 | ||
130 | if (dns_type_is_pseudo(type)) | |
131 | return false; | |
132 | ||
133 | return !IN_SET(type, | |
134 | DNS_TYPE_CNAME, | |
135 | DNS_TYPE_DNAME, | |
136 | DNS_TYPE_NSEC3, | |
137 | DNS_TYPE_NSEC, | |
138 | DNS_TYPE_RRSIG, | |
139 | DNS_TYPE_NXT, | |
140 | DNS_TYPE_SIG, | |
141 | DNS_TYPE_KEY); | |
142 | } | |
143 | ||
e8233bce LP |
144 | bool dns_type_may_wildcard(uint16_t type) { |
145 | ||
146 | /* The following records may not be expanded from wildcard RRsets */ | |
147 | ||
148 | if (dns_type_is_pseudo(type)) | |
149 | return false; | |
150 | ||
151 | return !IN_SET(type, | |
152 | DNS_TYPE_NSEC3, | |
153 | DNS_TYPE_SOA, | |
154 | ||
155 | /* Prohibited by https://tools.ietf.org/html/rfc4592#section-4.4 */ | |
156 | DNS_TYPE_DNAME); | |
157 | } | |
158 | ||
588c53d0 LP |
159 | bool dns_type_apex_only(uint16_t type) { |
160 | ||
161 | /* Returns true for all RR types that may only appear signed in a zone apex */ | |
162 | ||
163 | return IN_SET(type, | |
164 | DNS_TYPE_SOA, | |
165 | DNS_TYPE_NS, /* this one can appear elsewhere, too, but not signed */ | |
166 | DNS_TYPE_DNSKEY, | |
167 | DNS_TYPE_NSEC3PARAM); | |
168 | } | |
169 | ||
91adc4db LP |
170 | bool dns_type_is_dnssec(uint16_t type) { |
171 | return IN_SET(type, | |
172 | DNS_TYPE_DS, | |
173 | DNS_TYPE_DNSKEY, | |
174 | DNS_TYPE_RRSIG, | |
175 | DNS_TYPE_NSEC, | |
176 | DNS_TYPE_NSEC3, | |
177 | DNS_TYPE_NSEC3PARAM); | |
178 | } | |
179 | ||
d0129ddb LP |
180 | bool dns_type_is_obsolete(uint16_t type) { |
181 | return IN_SET(type, | |
182 | /* Obsoleted by RFC 973 */ | |
183 | DNS_TYPE_MD, | |
184 | DNS_TYPE_MF, | |
185 | DNS_TYPE_MAILA, | |
186 | ||
187 | /* Kinda obsoleted by RFC 2505 */ | |
188 | DNS_TYPE_MB, | |
189 | DNS_TYPE_MG, | |
190 | DNS_TYPE_MR, | |
191 | DNS_TYPE_MINFO, | |
192 | DNS_TYPE_MAILB, | |
193 | ||
194 | /* RFC1127 kinda obsoleted this by recommending against its use */ | |
195 | DNS_TYPE_WKS, | |
196 | ||
197 | /* Declared historical by RFC 6563 */ | |
198 | DNS_TYPE_A6, | |
199 | ||
200 | /* Obsoleted by DNSSEC-bis */ | |
201 | DNS_TYPE_NXT, | |
202 | ||
203 | /* RFC 1035 removed support for concepts that needed this from RFC 883 */ | |
204 | DNS_TYPE_NULL); | |
205 | } | |
206 | ||
41815a4a LP |
207 | bool dns_type_needs_authentication(uint16_t type) { |
208 | ||
209 | /* Returns true for all (non-obsolete) RR types where records are not useful if they aren't | |
210 | * authenticated. I.e. everything that contains crypto keys. */ | |
211 | ||
212 | return IN_SET(type, | |
213 | DNS_TYPE_CERT, | |
214 | DNS_TYPE_SSHFP, | |
215 | DNS_TYPE_IPSECKEY, | |
216 | DNS_TYPE_DS, | |
217 | DNS_TYPE_DNSKEY, | |
218 | DNS_TYPE_TLSA, | |
219 | DNS_TYPE_CDNSKEY, | |
220 | DNS_TYPE_OPENPGPKEY, | |
221 | DNS_TYPE_CAA); | |
222 | } | |
223 | ||
d07b43a1 LP |
224 | int dns_type_to_af(uint16_t t) { |
225 | switch (t) { | |
226 | ||
227 | case DNS_TYPE_A: | |
228 | return AF_INET; | |
229 | ||
230 | case DNS_TYPE_AAAA: | |
231 | return AF_INET6; | |
232 | ||
233 | case DNS_TYPE_ANY: | |
234 | return AF_UNSPEC; | |
235 | ||
236 | default: | |
237 | return -EINVAL; | |
238 | } | |
239 | } | |
240 | ||
4b548ef3 LP |
241 | const char *dns_class_to_string(uint16_t class) { |
242 | ||
243 | switch (class) { | |
244 | ||
245 | case DNS_CLASS_IN: | |
246 | return "IN"; | |
247 | ||
248 | case DNS_CLASS_ANY: | |
249 | return "ANY"; | |
250 | } | |
251 | ||
252 | return NULL; | |
253 | } | |
254 | ||
255 | int dns_class_from_string(const char *s) { | |
256 | ||
257 | if (!s) | |
258 | return _DNS_CLASS_INVALID; | |
259 | ||
260 | if (strcaseeq(s, "IN")) | |
261 | return DNS_CLASS_IN; | |
262 | else if (strcaseeq(s, "ANY")) | |
263 | return DNS_CLASS_ANY; | |
264 | ||
265 | return _DNS_CLASS_INVALID; | |
266 | } | |
cfb90da3 ZJS |
267 | |
268 | const char* tlsa_cert_usage_to_string(uint8_t cert_usage) { | |
fb8a9fc9 LP |
269 | |
270 | switch (cert_usage) { | |
271 | ||
272 | case 0: | |
273 | return "CA constraint"; | |
274 | ||
275 | case 1: | |
276 | return "Service certificate constraint"; | |
277 | ||
278 | case 2: | |
279 | return "Trust anchor assertion"; | |
280 | ||
281 | case 3: | |
282 | return "Domain-issued certificate"; | |
283 | ||
284 | case 4 ... 254: | |
285 | return "Unassigned"; | |
286 | ||
287 | case 255: | |
288 | return "Private use"; | |
cfb90da3 | 289 | } |
fb8a9fc9 LP |
290 | |
291 | return NULL; /* clang cannot count that we covered everything */ | |
cfb90da3 ZJS |
292 | } |
293 | ||
294 | const char* tlsa_selector_to_string(uint8_t selector) { | |
fb8a9fc9 LP |
295 | switch (selector) { |
296 | ||
297 | case 0: | |
298 | return "Full Certificate"; | |
299 | ||
300 | case 1: | |
301 | return "SubjectPublicKeyInfo"; | |
302 | ||
303 | case 2 ... 254: | |
304 | return "Unassigned"; | |
305 | ||
306 | case 255: | |
307 | return "Private use"; | |
cfb90da3 | 308 | } |
fb8a9fc9 LP |
309 | |
310 | return NULL; | |
cfb90da3 ZJS |
311 | } |
312 | ||
313 | const char* tlsa_matching_type_to_string(uint8_t selector) { | |
fb8a9fc9 LP |
314 | |
315 | switch (selector) { | |
316 | ||
317 | case 0: | |
318 | return "No hash used"; | |
319 | ||
320 | case 1: | |
321 | return "SHA-256"; | |
322 | ||
323 | case 2: | |
324 | return "SHA-512"; | |
325 | ||
326 | case 3 ... 254: | |
327 | return "Unassigned"; | |
328 | ||
329 | case 255: | |
330 | return "Private use"; | |
cfb90da3 | 331 | } |
fb8a9fc9 LP |
332 | |
333 | return NULL; | |
cfb90da3 | 334 | } |