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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 | |
7263f724 ZJS |
6 | ***/ |
7 | ||
d07b43a1 | 8 | #include <sys/socket.h> |
dccca82b | 9 | #include <errno.h> |
d07b43a1 | 10 | |
7263f724 | 11 | #include "dns-type.h" |
869b3b67 | 12 | #include "parse-util.h" |
4b548ef3 | 13 | #include "string-util.h" |
7263f724 ZJS |
14 | |
15 | typedef const struct { | |
16 | uint16_t type; | |
17 | const char *name; | |
18 | } dns_type; | |
19 | ||
20 | static const struct dns_type_name * | |
c9f7b4d3 | 21 | lookup_dns_type (register const char *str, register GPERF_LEN_TYPE len); |
7263f724 ZJS |
22 | |
23 | #include "dns_type-from-name.h" | |
24 | #include "dns_type-to-name.h" | |
25 | ||
de292aa1 | 26 | int dns_type_from_string(const char *s) { |
7263f724 ZJS |
27 | const struct dns_type_name *sc; |
28 | ||
29 | assert(s); | |
7263f724 ZJS |
30 | |
31 | sc = lookup_dns_type(s, strlen(s)); | |
869b3b67 ZJS |
32 | if (sc) |
33 | return sc->id; | |
7263f724 | 34 | |
869b3b67 ZJS |
35 | s = startswith_no_case(s, "TYPE"); |
36 | if (s) { | |
37 | unsigned x; | |
38 | ||
39 | if (safe_atou(s, &x) >= 0 && | |
40 | x <= UINT16_MAX) | |
41 | return (int) x; | |
42 | } | |
43 | ||
44 | return _DNS_TYPE_INVALID; | |
7263f724 | 45 | } |
8e6edc49 | 46 | |
bea4c76f LP |
47 | bool dns_type_is_pseudo(uint16_t type) { |
48 | ||
49 | /* Checks whether the specified type is a "pseudo-type". What | |
50 | * a "pseudo-type" precisely is, is defined only very weakly, | |
51 | * but apparently entails all RR types that are not actually | |
52 | * stored as RRs on the server and should hence also not be | |
53 | * cached. We use this list primarily to validate NSEC type | |
c33be4a6 | 54 | * bitfields, and to verify what to cache. */ |
bea4c76f LP |
55 | |
56 | return IN_SET(type, | |
57 | 0, /* A Pseudo RR type, according to RFC 2931 */ | |
58 | DNS_TYPE_ANY, | |
59 | DNS_TYPE_AXFR, | |
60 | DNS_TYPE_IXFR, | |
61 | DNS_TYPE_OPT, | |
62 | DNS_TYPE_TSIG, | |
63 | DNS_TYPE_TKEY | |
64 | ); | |
8e6edc49 | 65 | } |
c463eb78 | 66 | |
4b548ef3 LP |
67 | bool dns_class_is_pseudo(uint16_t class) { |
68 | return class == DNS_TYPE_ANY; | |
69 | } | |
70 | ||
c463eb78 LP |
71 | bool dns_type_is_valid_query(uint16_t type) { |
72 | ||
73 | /* The types valid as questions in packets */ | |
74 | ||
75 | return !IN_SET(type, | |
76 | 0, | |
77 | DNS_TYPE_OPT, | |
78 | DNS_TYPE_TSIG, | |
04680e36 LP |
79 | DNS_TYPE_TKEY, |
80 | ||
81 | /* RRSIG are technically valid as questions, but we refuse doing explicit queries for them, as | |
82 | * they aren't really payload, but signatures for payload, and cannot be validated on their | |
83 | * own. After all they are the signatures, and have no signatures of their own validating | |
84 | * them. */ | |
85 | DNS_TYPE_RRSIG); | |
c463eb78 LP |
86 | } |
87 | ||
6ebd1e33 LP |
88 | bool dns_type_is_zone_transer(uint16_t type) { |
89 | ||
90 | /* Zone transfers, either normal or incremental */ | |
91 | ||
92 | return IN_SET(type, | |
93 | DNS_TYPE_AXFR, | |
94 | DNS_TYPE_IXFR); | |
95 | } | |
96 | ||
c463eb78 LP |
97 | bool dns_type_is_valid_rr(uint16_t type) { |
98 | ||
99 | /* The types valid as RR in packets (but not necessarily | |
100 | * stored on servers). */ | |
101 | ||
102 | return !IN_SET(type, | |
103 | DNS_TYPE_ANY, | |
104 | DNS_TYPE_AXFR, | |
105 | DNS_TYPE_IXFR); | |
106 | } | |
4b548ef3 LP |
107 | |
108 | bool dns_class_is_valid_rr(uint16_t class) { | |
109 | return class != DNS_CLASS_ANY; | |
110 | } | |
111 | ||
d3c7e913 LP |
112 | bool dns_type_may_redirect(uint16_t type) { |
113 | /* The following record types should never be redirected using | |
114 | * CNAME/DNAME RRs. See | |
115 | * <https://tools.ietf.org/html/rfc4035#section-2.5>. */ | |
116 | ||
117 | if (dns_type_is_pseudo(type)) | |
118 | return false; | |
119 | ||
120 | return !IN_SET(type, | |
121 | DNS_TYPE_CNAME, | |
122 | DNS_TYPE_DNAME, | |
123 | DNS_TYPE_NSEC3, | |
124 | DNS_TYPE_NSEC, | |
125 | DNS_TYPE_RRSIG, | |
126 | DNS_TYPE_NXT, | |
127 | DNS_TYPE_SIG, | |
128 | DNS_TYPE_KEY); | |
129 | } | |
130 | ||
e8233bce LP |
131 | bool dns_type_may_wildcard(uint16_t type) { |
132 | ||
133 | /* The following records may not be expanded from wildcard RRsets */ | |
134 | ||
135 | if (dns_type_is_pseudo(type)) | |
136 | return false; | |
137 | ||
138 | return !IN_SET(type, | |
139 | DNS_TYPE_NSEC3, | |
140 | DNS_TYPE_SOA, | |
141 | ||
142 | /* Prohibited by https://tools.ietf.org/html/rfc4592#section-4.4 */ | |
143 | DNS_TYPE_DNAME); | |
144 | } | |
145 | ||
588c53d0 LP |
146 | bool dns_type_apex_only(uint16_t type) { |
147 | ||
148 | /* Returns true for all RR types that may only appear signed in a zone apex */ | |
149 | ||
150 | return IN_SET(type, | |
151 | DNS_TYPE_SOA, | |
152 | DNS_TYPE_NS, /* this one can appear elsewhere, too, but not signed */ | |
153 | DNS_TYPE_DNSKEY, | |
154 | DNS_TYPE_NSEC3PARAM); | |
155 | } | |
156 | ||
91adc4db LP |
157 | bool dns_type_is_dnssec(uint16_t type) { |
158 | return IN_SET(type, | |
159 | DNS_TYPE_DS, | |
160 | DNS_TYPE_DNSKEY, | |
161 | DNS_TYPE_RRSIG, | |
162 | DNS_TYPE_NSEC, | |
163 | DNS_TYPE_NSEC3, | |
164 | DNS_TYPE_NSEC3PARAM); | |
165 | } | |
166 | ||
d0129ddb LP |
167 | bool dns_type_is_obsolete(uint16_t type) { |
168 | return IN_SET(type, | |
169 | /* Obsoleted by RFC 973 */ | |
170 | DNS_TYPE_MD, | |
171 | DNS_TYPE_MF, | |
172 | DNS_TYPE_MAILA, | |
173 | ||
174 | /* Kinda obsoleted by RFC 2505 */ | |
175 | DNS_TYPE_MB, | |
176 | DNS_TYPE_MG, | |
177 | DNS_TYPE_MR, | |
178 | DNS_TYPE_MINFO, | |
179 | DNS_TYPE_MAILB, | |
180 | ||
181 | /* RFC1127 kinda obsoleted this by recommending against its use */ | |
182 | DNS_TYPE_WKS, | |
183 | ||
184 | /* Declared historical by RFC 6563 */ | |
185 | DNS_TYPE_A6, | |
186 | ||
187 | /* Obsoleted by DNSSEC-bis */ | |
188 | DNS_TYPE_NXT, | |
189 | ||
190 | /* RFC 1035 removed support for concepts that needed this from RFC 883 */ | |
191 | DNS_TYPE_NULL); | |
192 | } | |
193 | ||
41815a4a LP |
194 | bool dns_type_needs_authentication(uint16_t type) { |
195 | ||
196 | /* Returns true for all (non-obsolete) RR types where records are not useful if they aren't | |
197 | * authenticated. I.e. everything that contains crypto keys. */ | |
198 | ||
199 | return IN_SET(type, | |
200 | DNS_TYPE_CERT, | |
201 | DNS_TYPE_SSHFP, | |
202 | DNS_TYPE_IPSECKEY, | |
203 | DNS_TYPE_DS, | |
204 | DNS_TYPE_DNSKEY, | |
205 | DNS_TYPE_TLSA, | |
206 | DNS_TYPE_CDNSKEY, | |
207 | DNS_TYPE_OPENPGPKEY, | |
208 | DNS_TYPE_CAA); | |
209 | } | |
210 | ||
d07b43a1 LP |
211 | int dns_type_to_af(uint16_t t) { |
212 | switch (t) { | |
213 | ||
214 | case DNS_TYPE_A: | |
215 | return AF_INET; | |
216 | ||
217 | case DNS_TYPE_AAAA: | |
218 | return AF_INET6; | |
219 | ||
220 | case DNS_TYPE_ANY: | |
221 | return AF_UNSPEC; | |
222 | ||
223 | default: | |
224 | return -EINVAL; | |
225 | } | |
226 | } | |
227 | ||
4b548ef3 LP |
228 | const char *dns_class_to_string(uint16_t class) { |
229 | ||
230 | switch (class) { | |
231 | ||
232 | case DNS_CLASS_IN: | |
233 | return "IN"; | |
234 | ||
235 | case DNS_CLASS_ANY: | |
236 | return "ANY"; | |
237 | } | |
238 | ||
239 | return NULL; | |
240 | } | |
241 | ||
242 | int dns_class_from_string(const char *s) { | |
243 | ||
244 | if (!s) | |
245 | return _DNS_CLASS_INVALID; | |
246 | ||
247 | if (strcaseeq(s, "IN")) | |
248 | return DNS_CLASS_IN; | |
249 | else if (strcaseeq(s, "ANY")) | |
250 | return DNS_CLASS_ANY; | |
251 | ||
252 | return _DNS_CLASS_INVALID; | |
253 | } | |
cfb90da3 ZJS |
254 | |
255 | const char* tlsa_cert_usage_to_string(uint8_t cert_usage) { | |
fb8a9fc9 LP |
256 | |
257 | switch (cert_usage) { | |
258 | ||
259 | case 0: | |
260 | return "CA constraint"; | |
261 | ||
262 | case 1: | |
263 | return "Service certificate constraint"; | |
264 | ||
265 | case 2: | |
266 | return "Trust anchor assertion"; | |
267 | ||
268 | case 3: | |
269 | return "Domain-issued certificate"; | |
270 | ||
271 | case 4 ... 254: | |
272 | return "Unassigned"; | |
273 | ||
274 | case 255: | |
275 | return "Private use"; | |
cfb90da3 | 276 | } |
fb8a9fc9 LP |
277 | |
278 | return NULL; /* clang cannot count that we covered everything */ | |
cfb90da3 ZJS |
279 | } |
280 | ||
281 | const char* tlsa_selector_to_string(uint8_t selector) { | |
fb8a9fc9 LP |
282 | switch (selector) { |
283 | ||
284 | case 0: | |
285 | return "Full Certificate"; | |
286 | ||
287 | case 1: | |
288 | return "SubjectPublicKeyInfo"; | |
289 | ||
290 | case 2 ... 254: | |
291 | return "Unassigned"; | |
292 | ||
293 | case 255: | |
294 | return "Private use"; | |
cfb90da3 | 295 | } |
fb8a9fc9 LP |
296 | |
297 | return NULL; | |
cfb90da3 ZJS |
298 | } |
299 | ||
300 | const char* tlsa_matching_type_to_string(uint8_t selector) { | |
fb8a9fc9 LP |
301 | |
302 | switch (selector) { | |
303 | ||
304 | case 0: | |
305 | return "No hash used"; | |
306 | ||
307 | case 1: | |
308 | return "SHA-256"; | |
309 | ||
310 | case 2: | |
311 | return "SHA-512"; | |
312 | ||
313 | case 3 ... 254: | |
314 | return "Unassigned"; | |
315 | ||
316 | case 255: | |
317 | return "Private use"; | |
cfb90da3 | 318 | } |
fb8a9fc9 LP |
319 | |
320 | return NULL; | |
cfb90da3 | 321 | } |