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 <netinet/in.h>
  25
  26 #include "bitmap.h"
  27 #include "dns-type.h"
  28 #include "hashmap.h"
  29 #include "in-addr-util.h"
  30 #include "list.h"
  31
  32 typedef struct DnsResourceKey DnsResourceKey;
  33 typedef struct DnsResourceRecord DnsResourceRecord;
  34 typedef struct DnsTxtItem DnsTxtItem;
  35
  36 /* DNS record classes, see RFC 1035 */
  37 enum {
  38         DNS_CLASS_IN   = 0x01,
  39         DNS_CLASS_ANY  = 0xFF,
  40         _DNS_CLASS_MAX,
  41         _DNS_CLASS_INVALID = -1
  42 };
  43
  44 struct DnsResourceKey {
  45         unsigned n_ref;
  46         uint16_t class, type;
  47         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
  48 };
  49
  50 struct DnsTxtItem {
  51         size_t length;
  52         LIST_FIELDS(DnsTxtItem, items);
  53         uint8_t data[];
  54 };
  55
  56 struct DnsResourceRecord {
  57         unsigned n_ref;
  58         DnsResourceKey *key;
  59         uint32_t ttl;
  60         bool unparseable;
  61         union {
  62                 struct {
  63                         void *data;
  64                         size_t size;
  65                 } generic;
  66
  67                 struct {
  68                         uint16_t priority;
  69                         uint16_t weight;
  70                         uint16_t port;
  71                         char *name;
  72                 } srv;
  73
  74                 struct {
  75                         char *name;
  76                 } ptr, ns, cname, dname;
  77
  78                 struct {
  79                         char *cpu;
  80                         char *os;
  81                 } hinfo;
  82
  83                 struct {
  84                         DnsTxtItem *items;
  85                 } txt, spf;
  86
  87                 struct {
  88                         struct in_addr in_addr;
  89                 } a;
  90
  91                 struct {
  92                         struct in6_addr in6_addr;
  93                 } aaaa;
  94
  95                 struct {
  96                         char *mname;
  97                         char *rname;
  98                         uint32_t serial;
  99                         uint32_t refresh;
 100                         uint32_t retry;
 101                         uint32_t expire;
 102                         uint32_t minimum;
 103                 } soa;
 104
 105                 struct {
 106                         uint16_t priority;
 107                         char *exchange;
 108                 } mx;
 109
 110                 struct {
 111                         uint8_t version;
 112                         uint8_t size;
 113                         uint8_t horiz_pre;
 114                         uint8_t vert_pre;
 115                         uint32_t latitude;
 116                         uint32_t longitude;
 117                         uint32_t altitude;
 118                 } loc;
 119
 120                 struct {
 121                         uint16_t key_tag;
 122                         uint8_t algorithm;
 123                         uint8_t digest_type;
 124                         void *digest;
 125                         size_t digest_size;
 126                 } ds;
 127
 128                 /* https://tools.ietf.org/html/rfc4255#section-3.1 */
 129                 struct {
 130                         uint8_t algorithm;
 131                         uint8_t fptype;
 132                         void *fingerprint;
 133                         size_t fingerprint_size;
 134                 } sshfp;
 135
 136                 /* http://tools.ietf.org/html/rfc4034#section-2.1 */
 137                 struct {
 138                         bool zone_key_flag:1;
 139                         bool sep_flag:1;
 140                         uint8_t algorithm;
 141                         void* key;
 142                         size_t key_size;
 143                 } dnskey;
 144
 145                 /* http://tools.ietf.org/html/rfc4034#section-3.1 */
 146                 struct {
 147                         uint16_t type_covered;
 148                         uint8_t algorithm;
 149                         uint8_t labels;
 150                         uint32_t original_ttl;
 151                         uint32_t expiration;
 152                         uint32_t inception;
 153                         uint16_t key_tag;
 154                         char *signer;
 155                         void *signature;
 156                         size_t signature_size;
 157                 } rrsig;
 158
 159                 struct {
 160                         char *next_domain_name;
 161                         Bitmap *types;
 162                 } nsec;
 163
 164                 struct {
 165                         uint8_t algorithm;
 166                         uint8_t flags;
 167                         uint16_t iterations;
 168                         void *salt;
 169                         size_t salt_size;
 170                         void *next_hashed_name;
 171                         size_t next_hashed_name_size;
 172                         Bitmap *types;
 173                 } nsec3;
 174         };
 175 };
 176
 177 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 178         if (_unlikely_(!key))
 179                 return NULL;
 180
 181         if (key->_name)
 182                 return key->_name;
 183
 184         return (char*) key + sizeof(DnsResourceKey);
 185 }
 186
 187 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 188 DnsResourceKey* dns_resource_key_new_cname(const DnsResourceKey *key);
 189 DnsResourceKey* dns_resource_key_new_dname(const DnsResourceKey *key);
 190 DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname);
 191 int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name);
 192 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 193 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 194 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 195 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 196 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain);
 197 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain);
 198 int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
 199 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 200
 201 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 202 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
 203 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 204 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 205 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 206 int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 207 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 208 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
 209 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 210
 211 DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i);
 212 bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
 213
 214 const char *dns_class_to_string(uint16_t type);
 215 int dns_class_from_string(const char *name, uint16_t *class);
 216
 217 extern const struct hash_ops dns_resource_key_hash_ops;