chiark / gitweb /
027f6cac844cbf9b58b8caf3abdd97e9075f311a
[elogind.git] / src / resolve / resolved-dns-rr.h
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 #pragma once
4
5 /***
6   This file is part of systemd.
7
8   Copyright 2014 Lennart Poettering
9
10   systemd is free software; you can redistribute it and/or modify it
11   under the terms of the GNU Lesser General Public License as published by
12   the Free Software Foundation; either version 2.1 of the License, or
13   (at your option) any later version.
14
15   systemd is distributed in the hope that it will be useful, but
16   WITHOUT ANY WARRANTY; without even the implied warranty of
17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18   Lesser General Public License for more details.
19
20   You should have received a copy of the GNU Lesser General Public License
21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
22  ***/
23
24 #include <inttypes.h>
25 #include <netinet/in.h>
26
27 #include "util.h"
28 #include "hashmap.h"
29 #include "in-addr-util.h"
30
31 typedef struct DnsResourceKey DnsResourceKey;
32 typedef struct DnsResourceRecord DnsResourceRecord;
33
34 /* DNS record classes, see RFC 1035 */
35 enum {
36         DNS_CLASS_IN   = 0x01,
37         DNS_CLASS_ANY  = 0xFF,
38         _DNS_CLASS_MAX,
39         _DNS_CLASS_INVALID = -1
40 };
41
42 /* DNS record types, see RFC 1035 */
43 enum {
44         /* Normal records */
45         DNS_TYPE_A     = 0x01,
46         DNS_TYPE_NS    = 0x02,
47         DNS_TYPE_CNAME = 0x05,
48         DNS_TYPE_SOA   = 0x06,
49         DNS_TYPE_PTR   = 0x0C,
50         DNS_TYPE_HINFO = 0x0D,
51         DNS_TYPE_MX    = 0x0F,
52         DNS_TYPE_TXT   = 0x10,
53         DNS_TYPE_AAAA  = 0x1C,
54         DNS_TYPE_LOC   = 0x1D,
55         DNS_TYPE_SRV   = 0x21,
56         DNS_TYPE_DNAME = 0x27,
57         DNS_TYPE_SSHFP = 0x2C,
58
59         DNS_TYPE_SPF   = 0x63,
60
61         /* Special records */
62         DNS_TYPE_ANY   = 0xFF,
63         DNS_TYPE_OPT   = 0x29,      /* EDNS0 option */
64         DNS_TYPE_TKEY  = 0xF9,
65         DNS_TYPE_TSIG  = 0xFA,
66         DNS_TYPE_IXFR  = 0xFB,
67         DNS_TYPE_AXFR  = 0xFC,
68         _DNS_TYPE_MAX,
69         _DNS_TYPE_INVALID = -1
70 };
71
72 struct DnsResourceKey {
73         unsigned n_ref;
74         uint16_t class, type;
75         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
76 };
77
78 struct DnsResourceRecord {
79         unsigned n_ref;
80         DnsResourceKey *key;
81         uint32_t ttl;
82         bool unparseable;
83         union {
84                 struct {
85                         void *data;
86                         uint16_t size;
87                 } generic;
88
89                 /* struct { */
90                 /*         uint16_t priority; */
91                 /*         uint16_t weight; */
92                 /*         uint16_t port; */
93                 /*         char *name; */
94                 /* } srv; */
95
96                 struct {
97                         char *name;
98                 } ptr, ns, cname, dname;
99
100                 struct {
101                         char *cpu;
102                         char *os;
103                 } hinfo;
104
105                 struct {
106                         char **strings;
107                 } txt;
108
109                 struct {
110                         struct in_addr in_addr;
111                 } a;
112
113                 struct {
114                         struct in6_addr in6_addr;
115                 } aaaa;
116
117                 struct {
118                         char *mname;
119                         char *rname;
120                         uint32_t serial;
121                         uint32_t refresh;
122                         uint32_t retry;
123                         uint32_t expire;
124                         uint32_t minimum;
125                 } soa;
126
127                 struct {
128                         uint16_t priority;
129                         char *exchange;
130                 } mx;
131
132                 struct {
133                         uint8_t version;
134                         uint8_t size;
135                         uint8_t horiz_pre;
136                         uint8_t vert_pre;
137                         uint32_t latitude;
138                         uint32_t longitude;
139                         uint32_t altitude;
140                 } loc;
141         };
142 };
143
144 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
145         if (_unlikely_(!key))
146                 return NULL;
147
148         if (key->_name)
149                 return key->_name;
150
151         return (char*) key + sizeof(DnsResourceKey);
152 }
153
154 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
155 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
156 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
157 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
158 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
159 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
160 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
161 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
162 int dns_resource_key_compare_func(const void *a, const void *b);
163 int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
164 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
165
166 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
167 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
168 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
169 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
170 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
171 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
172 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
173 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
174
175 const char *dns_type_to_string(uint16_t type);
176 int dns_type_from_string(const char *name, uint16_t *type);
177
178 const char *dns_class_to_string(uint16_t type);
179 int dns_class_from_string(const char *name, uint16_t *class);