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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 | ||
c9403dce ZJS |
22 | #pragma once |
23 | ||
74b2466e | 24 | |
a8fbdf54 TA |
25 | #include <errno.h> |
26 | #include <stdbool.h> | |
27 | #include <stddef.h> | |
28 | #include <stdint.h> | |
29 | ||
74b2466e LP |
30 | #include "hashmap.h" |
31 | #include "in-addr-util.h" | |
32 | ||
3b37fa73 | 33 | /* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ |
74b2466e | 34 | #define DNS_LABEL_MAX 63 |
3b37fa73 LP |
35 | |
36 | /* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ | |
422baca0 | 37 | #define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) |
74b2466e | 38 | |
1dfbf000 LP |
39 | /* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */ |
40 | #define DNS_HOSTNAME_MAX 253 | |
41 | ||
2b442ac8 LP |
42 | /* Maximum length of a full hostname, on the wire, including the final NUL byte */ |
43 | #define DNS_WIRE_FOMAT_HOSTNAME_MAX 255 | |
44 | ||
e7ff0e0b LP |
45 | /* Maximum number of labels per valid hostname */ |
46 | #define DNS_N_LABELS_MAX 127 | |
47 | ||
74b2466e | 48 | int dns_label_unescape(const char **name, char *dest, size_t sz); |
642900d3 | 49 | int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz); |
422baca0 LP |
50 | int dns_label_escape(const char *p, size_t l, char *dest, size_t sz); |
51 | int dns_label_escape_new(const char *p, size_t l, char **ret); | |
74b2466e | 52 | |
f7455baa LP |
53 | static inline int dns_name_parent(const char **name) { |
54 | return dns_label_unescape(name, NULL, DNS_LABEL_MAX); | |
55 | } | |
56 | ||
bdf10b5b LP |
57 | int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); |
58 | int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); | |
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); | |
86 | ||
58db254a LP |
87 | int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret); |
88 | ||
74b2466e | 89 | int dns_name_reverse(int family, const union in_addr_union *a, char **ret); |
b914e211 | 90 | int dns_name_address(const char *p, int *family, union in_addr_union *a); |
74b2466e | 91 | |
dc477e73 LP |
92 | bool dns_name_is_root(const char *name); |
93 | bool dns_name_is_single_label(const char *name); | |
54adabf7 | 94 | |
3cd03457 | 95 | int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical); |
0a49b6b6 | 96 | |
7e8131e9 | 97 | bool dns_srv_type_is_valid(const char *name); |
0a49b6b6 | 98 | bool dns_service_name_is_valid(const char *name); |
0e8eedbb LP |
99 | |
100 | int dns_service_join(const char *name, const char *type, const char *domain, char **ret); | |
101 | int dns_service_split(const char *joined, char **name, char **type, char **domain); | |
e7ff0e0b LP |
102 | |
103 | int dns_name_suffix(const char *name, unsigned n_labels, const char **ret); | |
104 | int dns_name_count_labels(const char *name); |