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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
0ef6f454 LP |
2 | #pragma once |
3 | ||
74b2466e LP |
4 | /*** |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2014 Lennart Poettering | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
a8fbdf54 TA |
23 | #include <errno.h> |
24 | #include <stdbool.h> | |
25 | #include <stddef.h> | |
26 | #include <stdint.h> | |
27 | ||
74b2466e LP |
28 | #include "hashmap.h" |
29 | #include "in-addr-util.h" | |
30 | ||
3b37fa73 | 31 | /* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ |
74b2466e | 32 | #define DNS_LABEL_MAX 63 |
3b37fa73 LP |
33 | |
34 | /* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ | |
422baca0 | 35 | #define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) |
74b2466e | 36 | |
1dfbf000 LP |
37 | /* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */ |
38 | #define DNS_HOSTNAME_MAX 253 | |
39 | ||
2b442ac8 LP |
40 | /* Maximum length of a full hostname, on the wire, including the final NUL byte */ |
41 | #define DNS_WIRE_FOMAT_HOSTNAME_MAX 255 | |
42 | ||
e7ff0e0b LP |
43 | /* Maximum number of labels per valid hostname */ |
44 | #define DNS_N_LABELS_MAX 127 | |
45 | ||
74b2466e | 46 | int dns_label_unescape(const char **name, char *dest, size_t sz); |
642900d3 | 47 | int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz); |
422baca0 LP |
48 | int dns_label_escape(const char *p, size_t l, char *dest, size_t sz); |
49 | int dns_label_escape_new(const char *p, size_t l, char **ret); | |
74b2466e | 50 | |
f7455baa LP |
51 | static inline int dns_name_parent(const char **name) { |
52 | return dns_label_unescape(name, NULL, DNS_LABEL_MAX); | |
53 | } | |
54 | ||
349cc4a5 | 55 | #if HAVE_LIBIDN |
bdf10b5b LP |
56 | int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); |
57 | int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); | |
87057e24 | 58 | #endif |
bdf10b5b | 59 | |
9ca45586 LP |
60 | int dns_name_concat(const char *a, const char *b, char **ret); |
61 | ||
62 | static inline int dns_name_normalize(const char *s, char **ret) { | |
63 | /* dns_name_concat() normalizes as a side-effect */ | |
64 | return dns_name_concat(s, NULL, ret); | |
65 | } | |
66 | ||
df6cfeef NO |
67 | static inline int dns_name_is_valid(const char *s) { |
68 | int r; | |
9ca45586 LP |
69 | |
70 | /* dns_name_normalize() verifies as a side effect */ | |
df6cfeef NO |
71 | r = dns_name_normalize(s, NULL); |
72 | if (r == -EINVAL) | |
73 | return 0; | |
74 | if (r < 0) | |
75 | return r; | |
76 | return 1; | |
77 | } | |
74b2466e | 78 | |
b826ab58 | 79 | void dns_name_hash_func(const void *s, struct siphash *state); |
74b2466e | 80 | int dns_name_compare_func(const void *a, const void *b); |
d5099efc | 81 | extern const struct hash_ops dns_name_hash_ops; |
74b2466e | 82 | |
ae72b22c | 83 | int dns_name_between(const char *a, const char *b, const char *c); |
74b2466e LP |
84 | int dns_name_equal(const char *x, const char *y); |
85 | int dns_name_endswith(const char *name, const char *suffix); | |
eb241cdb | 86 | int dns_name_startswith(const char *name, const char *prefix); |
74b2466e | 87 | |
58db254a LP |
88 | int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret); |
89 | ||
74b2466e | 90 | int dns_name_reverse(int family, const union in_addr_union *a, char **ret); |
b914e211 | 91 | int dns_name_address(const char *p, int *family, union in_addr_union *a); |
74b2466e | 92 | |
dc477e73 LP |
93 | bool dns_name_is_root(const char *name); |
94 | bool dns_name_is_single_label(const char *name); | |
54adabf7 | 95 | |
3cd03457 | 96 | int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical); |
0a49b6b6 | 97 | |
7e8131e9 | 98 | bool dns_srv_type_is_valid(const char *name); |
0a49b6b6 | 99 | bool dns_service_name_is_valid(const char *name); |
0e8eedbb LP |
100 | |
101 | int dns_service_join(const char *name, const char *type, const char *domain, char **ret); | |
102 | int dns_service_split(const char *joined, char **name, char **type, char **domain); | |
e7ff0e0b LP |
103 | |
104 | int dns_name_suffix(const char *name, unsigned n_labels, const char **ret); | |
105 | int dns_name_count_labels(const char *name); | |
db5b0e92 | 106 | |
97c67192 | 107 | int dns_name_skip(const char *a, unsigned n_labels, const char **ret); |
db5b0e92 | 108 | int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b); |
b9282bc1 LP |
109 | |
110 | int dns_name_common_suffix(const char *a, const char *b, const char **ret); | |
0cf40f55 LP |
111 | |
112 | int dns_name_apply_idna(const char *name, char **ret); | |
08a4849e LP |
113 | |
114 | int dns_name_is_valid_or_address(const char *name); |