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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <inttypes.h>
#include <netinet/in.h>
#include "util.h"
#include "hashmap.h"
#include "in-addr-util.h"
typedef struct DnsResourceKey DnsResourceKey;
typedef struct DnsResourceRecord DnsResourceRecord;
/* DNS record classes, see RFC 1035 */
enum {
DNS_CLASS_IN = 0x01,
DNS_CLASS_ANY = 0xFF,
};
/* DNS record types, see RFC 1035 */
enum {
/* Normal records */
DNS_TYPE_A = 0x01,
DNS_TYPE_NS = 0x02,
DNS_TYPE_CNAME = 0x05,
DNS_TYPE_SOA = 0x06,
DNS_TYPE_PTR = 0x0C,
DNS_TYPE_HINFO = 0x0D,
DNS_TYPE_MX = 0x0F,
DNS_TYPE_TXT = 0x10,
DNS_TYPE_AAAA = 0x1C,
DNS_TYPE_SRV = 0x21,
DNS_TYPE_DNAME = 0x27,
DNS_TYPE_SSHFP = 0x2C,
/* Special records */
DNS_TYPE_ANY = 0xFF,
DNS_TYPE_OPT = 0x29, /* EDNS0 option */
DNS_TYPE_TKEY = 0xF9,
DNS_TYPE_TSIG = 0xFA,
DNS_TYPE_IXFR = 0xFB,
DNS_TYPE_AXFR = 0xFC,
};
struct DnsResourceKey {
unsigned n_ref;
uint16_t class, type;
char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
};
struct DnsResourceRecord {
unsigned n_ref;
DnsResourceKey *key;
uint32_t ttl;
union {
struct {
void *data;
uint16_t size;
} generic;
/* struct { */
/* uint16_t priority; */
/* uint16_t weight; */
/* uint16_t port; */
/* char *name; */
/* } srv; */
struct {
char *name;
} ptr, ns, cname;
struct {
char *cpu;
char *os;
} hinfo;
/* struct { */
/* char **list; */
/* } txt; */
struct {
struct in_addr in_addr;
} a;
struct {
struct in6_addr in6_addr;
} aaaa;
struct {
char *mname;
char *rname;
uint32_t serial;
uint32_t refresh;
uint32_t retry;
uint32_t expire;
uint32_t minimum;
} soa;
};
};
static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
if (_unlikely_(!key))
return NULL;
if (key->_name)
return key->_name;
return (char*) key + sizeof(DnsResourceKey);
}
DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
int dns_resource_key_compare_func(const void *a, const void *b);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
const char *dns_type_to_string(uint16_t type);
const char *dns_class_to_string(uint16_t type);
|
