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a032b68d | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
aa27b158 MP |
2 | #pragma once |
3 | ||
4c89c718 MP |
4 | #include <errno.h> |
5 | #include <stdbool.h> | |
6 | #include <stddef.h> | |
7 | #include <stdint.h> | |
8 | ||
3a6ce677 | 9 | #include "dns-def.h" |
5eef597e MP |
10 | #include "hashmap.h" |
11 | #include "in-addr-util.h" | |
12 | ||
6e866b33 | 13 | typedef enum DNSLabelFlags { |
a032b68d MB |
14 | DNS_LABEL_LDH = 1 << 0, /* Follow the "LDH" rule — only letters, digits, and internal hyphens. */ |
15 | DNS_LABEL_NO_ESCAPES = 1 << 1, /* Do not treat backslashes specially */ | |
16 | DNS_LABEL_LEAVE_TRAILING_DOT = 1 << 2, /* Leave trailing dot in place */ | |
6e866b33 MB |
17 | } DNSLabelFlags; |
18 | ||
19 | int dns_label_unescape(const char **name, char *dest, size_t sz, DNSLabelFlags flags); | |
7035cd9e | 20 | int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz); |
4c89c718 MP |
21 | int dns_label_escape(const char *p, size_t l, char *dest, size_t sz); |
22 | int dns_label_escape_new(const char *p, size_t l, char **ret); | |
23 | ||
24 | static inline int dns_name_parent(const char **name) { | |
6e866b33 | 25 | return dns_label_unescape(name, NULL, DNS_LABEL_MAX, 0); |
4c89c718 | 26 | } |
5eef597e | 27 | |
f5e65279 | 28 | #if HAVE_LIBIDN |
5eef597e MP |
29 | int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); |
30 | int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max); | |
81c58355 | 31 | #endif |
5eef597e | 32 | |
6e866b33 | 33 | int dns_name_concat(const char *a, const char *b, DNSLabelFlags flags, char **ret); |
13d276d0 | 34 | |
6e866b33 | 35 | static inline int dns_name_normalize(const char *s, DNSLabelFlags flags, char **ret) { |
13d276d0 | 36 | /* dns_name_concat() normalizes as a side-effect */ |
6e866b33 | 37 | return dns_name_concat(s, NULL, flags, ret); |
13d276d0 MP |
38 | } |
39 | ||
86f210e9 MP |
40 | static inline int dns_name_is_valid(const char *s) { |
41 | int r; | |
13d276d0 MP |
42 | |
43 | /* dns_name_normalize() verifies as a side effect */ | |
6e866b33 MB |
44 | r = dns_name_normalize(s, 0, NULL); |
45 | if (r == -EINVAL) | |
46 | return 0; | |
47 | if (r < 0) | |
48 | return r; | |
49 | return 1; | |
50 | } | |
51 | ||
52 | static inline int dns_name_is_valid_ldh(const char *s) { | |
53 | int r; | |
54 | ||
55 | r = dns_name_concat(s, NULL, DNS_LABEL_LDH|DNS_LABEL_NO_ESCAPES, NULL); | |
86f210e9 MP |
56 | if (r == -EINVAL) |
57 | return 0; | |
58 | if (r < 0) | |
59 | return r; | |
60 | return 1; | |
61 | } | |
5eef597e | 62 | |
9cde670f LB |
63 | static inline bool dns_name_is_empty(const char *s) { |
64 | return isempty(s) || streq(s, "."); | |
65 | } | |
66 | ||
6e866b33 MB |
67 | void dns_name_hash_func(const char *s, struct siphash *state); |
68 | int dns_name_compare_func(const char *a, const char *b); | |
5eef597e MP |
69 | extern const struct hash_ops dns_name_hash_ops; |
70 | ||
7035cd9e | 71 | int dns_name_between(const char *a, const char *b, const char *c); |
5eef597e MP |
72 | int dns_name_equal(const char *x, const char *y); |
73 | int dns_name_endswith(const char *name, const char *suffix); | |
4c89c718 MP |
74 | int dns_name_startswith(const char *name, const char *prefix); |
75 | ||
76 | int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret); | |
5eef597e MP |
77 | |
78 | int dns_name_reverse(int family, const union in_addr_union *a, char **ret); | |
79 | int dns_name_address(const char *p, int *family, union in_addr_union *a); | |
80 | ||
4c89c718 MP |
81 | bool dns_name_is_root(const char *name); |
82 | bool dns_name_is_single_label(const char *name); | |
83 | ||
84 | int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical); | |
85 | ||
86 | bool dns_srv_type_is_valid(const char *name); | |
52ad194e | 87 | bool dnssd_srv_type_is_valid(const char *name); |
4c89c718 MP |
88 | bool dns_service_name_is_valid(const char *name); |
89 | ||
90 | int dns_service_join(const char *name, const char *type, const char *domain, char **ret); | |
91 | int dns_service_split(const char *joined, char **name, char **type, char **domain); | |
92 | ||
93 | int dns_name_suffix(const char *name, unsigned n_labels, const char **ret); | |
94 | int dns_name_count_labels(const char *name); | |
95 | ||
96 | int dns_name_skip(const char *a, unsigned n_labels, const char **ret); | |
97 | int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b); | |
98 | ||
99 | int dns_name_common_suffix(const char *a, const char *b, const char **ret); | |
100 | ||
101 | int dns_name_apply_idna(const char *name, char **ret); | |
2897b343 MP |
102 | |
103 | int dns_name_is_valid_or_address(const char *name); | |
a032b68d MB |
104 | |
105 | int dns_name_dot_suffixed(const char *name); |