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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
aa27b158 MP |
2 | #pragma once |
3 | ||
5eef597e | 4 | /*** |
5eef597e MP |
5 | ***/ |
6 | ||
4c89c718 MP |
7 | #include <errno.h> |
8 | #include <stdbool.h> | |
9 | #include <stddef.h> | |
10 | #include <stdint.h> | |
11 | ||
5eef597e MP |
12 | #include "hashmap.h" |
13 | #include "in-addr-util.h" | |
14 | ||
4c89c718 | 15 | /* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ |
5eef597e | 16 | #define DNS_LABEL_MAX 63 |
4c89c718 MP |
17 | |
18 | /* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ | |
19 | #define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) | |
20 | ||
21 | /* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */ | |
22 | #define DNS_HOSTNAME_MAX 253 | |
23 | ||
24 | /* Maximum length of a full hostname, on the wire, including the final NUL byte */ | |
b012e921 | 25 | #define DNS_WIRE_FORMAT_HOSTNAME_MAX 255 |
4c89c718 MP |
26 | |
27 | /* Maximum number of labels per valid hostname */ | |
28 | #define DNS_N_LABELS_MAX 127 | |
5eef597e MP |
29 | |
30 | int dns_label_unescape(const char **name, char *dest, size_t sz); | |
7035cd9e | 31 | int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz); |
4c89c718 MP |
32 | int dns_label_escape(const char *p, size_t l, char *dest, size_t sz); |
33 | int dns_label_escape_new(const char *p, size_t l, char **ret); | |
34 | ||
35 | static inline int dns_name_parent(const char **name) { | |
36 | return dns_label_unescape(name, NULL, DNS_LABEL_MAX); | |
37 | } | |
5eef597e | 38 | |
f5e65279 | 39 | #if HAVE_LIBIDN |
5eef597e MP |
40 | int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); |
41 | int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); | |
81c58355 | 42 | #endif |
5eef597e | 43 | |
13d276d0 MP |
44 | int dns_name_concat(const char *a, const char *b, char **ret); |
45 | ||
46 | static inline int dns_name_normalize(const char *s, char **ret) { | |
47 | /* dns_name_concat() normalizes as a side-effect */ | |
48 | return dns_name_concat(s, NULL, ret); | |
49 | } | |
50 | ||
86f210e9 MP |
51 | static inline int dns_name_is_valid(const char *s) { |
52 | int r; | |
13d276d0 MP |
53 | |
54 | /* dns_name_normalize() verifies as a side effect */ | |
86f210e9 MP |
55 | r = dns_name_normalize(s, NULL); |
56 | if (r == -EINVAL) | |
57 | return 0; | |
58 | if (r < 0) | |
59 | return r; | |
60 | return 1; | |
61 | } | |
5eef597e | 62 | |
6300502b | 63 | void dns_name_hash_func(const void *s, struct siphash *state); |
5eef597e MP |
64 | int dns_name_compare_func(const void *a, const void *b); |
65 | extern const struct hash_ops dns_name_hash_ops; | |
66 | ||
7035cd9e | 67 | int dns_name_between(const char *a, const char *b, const char *c); |
5eef597e MP |
68 | int dns_name_equal(const char *x, const char *y); |
69 | int dns_name_endswith(const char *name, const char *suffix); | |
4c89c718 MP |
70 | int dns_name_startswith(const char *name, const char *prefix); |
71 | ||
72 | int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret); | |
5eef597e MP |
73 | |
74 | int dns_name_reverse(int family, const union in_addr_union *a, char **ret); | |
75 | int dns_name_address(const char *p, int *family, union in_addr_union *a); | |
76 | ||
4c89c718 MP |
77 | bool dns_name_is_root(const char *name); |
78 | bool dns_name_is_single_label(const char *name); | |
79 | ||
80 | int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical); | |
81 | ||
82 | bool dns_srv_type_is_valid(const char *name); | |
52ad194e | 83 | bool dnssd_srv_type_is_valid(const char *name); |
4c89c718 MP |
84 | bool dns_service_name_is_valid(const char *name); |
85 | ||
86 | int dns_service_join(const char *name, const char *type, const char *domain, char **ret); | |
87 | int dns_service_split(const char *joined, char **name, char **type, char **domain); | |
88 | ||
89 | int dns_name_suffix(const char *name, unsigned n_labels, const char **ret); | |
90 | int dns_name_count_labels(const char *name); | |
91 | ||
92 | int dns_name_skip(const char *a, unsigned n_labels, const char **ret); | |
93 | int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b); | |
94 | ||
95 | int dns_name_common_suffix(const char *a, const char *b, const char **ret); | |
96 | ||
97 | int dns_name_apply_idna(const char *name, char **ret); | |
2897b343 MP |
98 | |
99 | int dns_name_is_valid_or_address(const char *name); |