1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "hashmap.h"
#include "in-addr-util.h"
/* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */
#define DNS_LABEL_MAX 63
/* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */
#define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1)
/* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */
#define DNS_HOSTNAME_MAX 253
/* Maximum length of a full hostname, on the wire, including the final NUL byte */
#define DNS_WIRE_FORMAT_HOSTNAME_MAX 255
/* Maximum number of labels per valid hostname */
#define DNS_N_LABELS_MAX 127
typedef enum DNSLabelFlags {
DNS_LABEL_LDH = 1 << 0, /* Follow the "LDH" rule — only letters, digits, and internal hyphens. */
DNS_LABEL_NO_ESCAPES = 1 << 1, /* Do not treat backslashes specially */
} DNSLabelFlags;
int dns_label_unescape(const char **name, char *dest, size_t sz, DNSLabelFlags flags);
int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz);
int dns_label_escape(const char *p, size_t l, char *dest, size_t sz);
int dns_label_escape_new(const char *p, size_t l, char **ret);
static inline int dns_name_parent(const char **name) {
return dns_label_unescape(name, NULL, DNS_LABEL_MAX, 0);
}
#if HAVE_LIBIDN
int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
#endif
int dns_name_concat(const char *a, const char *b, DNSLabelFlags flags, char **ret);
static inline int dns_name_normalize(const char *s, DNSLabelFlags flags, char **ret) {
/* dns_name_concat() normalizes as a side-effect */
return dns_name_concat(s, NULL, flags, ret);
}
static inline int dns_name_is_valid(const char *s) {
int r;
/* dns_name_normalize() verifies as a side effect */
r = dns_name_normalize(s, 0, NULL);
if (r == -EINVAL)
return 0;
if (r < 0)
return r;
return 1;
}
static inline int dns_name_is_valid_ldh(const char *s) {
int r;
r = dns_name_concat(s, NULL, DNS_LABEL_LDH|DNS_LABEL_NO_ESCAPES, NULL);
if (r == -EINVAL)
return 0;
if (r < 0)
return r;
return 1;
}
void dns_name_hash_func(const char *s, struct siphash *state);
int dns_name_compare_func(const char *a, const char *b);
extern const struct hash_ops dns_name_hash_ops;
int dns_name_between(const char *a, const char *b, const char *c);
int dns_name_equal(const char *x, const char *y);
int dns_name_endswith(const char *name, const char *suffix);
int dns_name_startswith(const char *name, const char *prefix);
int dns_name_change_suffix(const char *name, const char *old_suffix, const char *new_suffix, char **ret);
int dns_name_reverse(int family, const union in_addr_union *a, char **ret);
int dns_name_address(const char *p, int *family, union in_addr_union *a);
bool dns_name_is_root(const char *name);
bool dns_name_is_single_label(const char *name);
int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical);
bool dns_srv_type_is_valid(const char *name);
bool dnssd_srv_type_is_valid(const char *name);
bool dns_service_name_is_valid(const char *name);
int dns_service_join(const char *name, const char *type, const char *domain, char **ret);
int dns_service_split(const char *joined, char **name, char **type, char **domain);
int dns_name_suffix(const char *name, unsigned n_labels, const char **ret);
int dns_name_count_labels(const char *name);
int dns_name_skip(const char *a, unsigned n_labels, const char **ret);
int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b);
int dns_name_common_suffix(const char *a, const char *b, const char **ret);
int dns_name_apply_idna(const char *name, char **ret);
int dns_name_is_valid_or_address(const char *name);
|
