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aa27b158 MP |
1 | #pragma once |
2 | ||
5eef597e MP |
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 | ||
4c89c718 MP |
22 | #include <errno.h> |
23 | #include <stdbool.h> | |
24 | #include <stddef.h> | |
25 | #include <stdint.h> | |
26 | ||
5eef597e MP |
27 | #include "hashmap.h" |
28 | #include "in-addr-util.h" | |
29 | ||
4c89c718 | 30 | /* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ |
5eef597e | 31 | #define DNS_LABEL_MAX 63 |
4c89c718 MP |
32 | |
33 | /* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ | |
34 | #define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) | |
35 | ||
36 | /* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */ | |
37 | #define DNS_HOSTNAME_MAX 253 | |
38 | ||
39 | /* Maximum length of a full hostname, on the wire, including the final NUL byte */ | |
40 | #define DNS_WIRE_FOMAT_HOSTNAME_MAX 255 | |
41 | ||
42 | /* Maximum number of labels per valid hostname */ | |
43 | #define DNS_N_LABELS_MAX 127 | |
5eef597e MP |
44 | |
45 | int dns_label_unescape(const char **name, char *dest, size_t sz); | |
7035cd9e | 46 | int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz); |
4c89c718 MP |
47 | int dns_label_escape(const char *p, size_t l, char *dest, size_t sz); |
48 | int dns_label_escape_new(const char *p, size_t l, char **ret); | |
49 | ||
50 | static inline int dns_name_parent(const char **name) { | |
51 | return dns_label_unescape(name, NULL, DNS_LABEL_MAX); | |
52 | } | |
5eef597e MP |
53 | |
54 | int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); | |
55 | int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); | |
56 | ||
13d276d0 MP |
57 | int dns_name_concat(const char *a, const char *b, char **ret); |
58 | ||
59 | static inline int dns_name_normalize(const char *s, char **ret) { | |
60 | /* dns_name_concat() normalizes as a side-effect */ | |
61 | return dns_name_concat(s, NULL, ret); | |
62 | } | |
63 | ||
86f210e9 MP |
64 | static inline int dns_name_is_valid(const char *s) { |
65 | int r; | |
13d276d0 MP |
66 | |
67 | /* dns_name_normalize() verifies as a side effect */ | |
86f210e9 MP |
68 | r = dns_name_normalize(s, NULL); |
69 | if (r == -EINVAL) | |
70 | return 0; | |
71 | if (r < 0) | |
72 | return r; | |
73 | return 1; | |
74 | } | |
5eef597e | 75 | |
6300502b | 76 | void dns_name_hash_func(const void *s, struct siphash *state); |
5eef597e MP |
77 | int dns_name_compare_func(const void *a, const void *b); |
78 | extern const struct hash_ops dns_name_hash_ops; | |
79 | ||
7035cd9e | 80 | int dns_name_between(const char *a, const char *b, const char *c); |
5eef597e MP |
81 | int dns_name_equal(const char *x, const char *y); |
82 | int dns_name_endswith(const char *name, const char *suffix); | |
4c89c718 MP |
83 | int dns_name_startswith(const char *name, const char *prefix); |
84 | ||
85 | int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret); | |
5eef597e MP |
86 | |
87 | int dns_name_reverse(int family, const union in_addr_union *a, char **ret); | |
88 | int dns_name_address(const char *p, int *family, union in_addr_union *a); | |
89 | ||
4c89c718 MP |
90 | bool dns_name_is_root(const char *name); |
91 | bool dns_name_is_single_label(const char *name); | |
92 | ||
93 | int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical); | |
94 | ||
95 | bool dns_srv_type_is_valid(const char *name); | |
96 | bool dns_service_name_is_valid(const char *name); | |
97 | ||
98 | int dns_service_join(const char *name, const char *type, const char *domain, char **ret); | |
99 | int dns_service_split(const char *joined, char **name, char **type, char **domain); | |
100 | ||
101 | int dns_name_suffix(const char *name, unsigned n_labels, const char **ret); | |
102 | int dns_name_count_labels(const char *name); | |
103 | ||
104 | int dns_name_skip(const char *a, unsigned n_labels, const char **ret); | |
105 | int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b); | |
106 | ||
107 | int dns_name_common_suffix(const char *a, const char *b, const char **ret); | |
108 | ||
109 | int dns_name_apply_idna(const char *name, char **ret); |