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 #include "dns-type.h"
  31
  32 typedef struct DnsResourceKey DnsResourceKey;
  33 typedef struct DnsResourceRecord DnsResourceRecord;
  34
  35 /* DNS record classes, see RFC 1035 */
  36 enum {
  37         DNS_CLASS_IN   = 0x01,
  38         DNS_CLASS_ANY  = 0xFF,
  39         _DNS_CLASS_MAX,
  40         _DNS_CLASS_INVALID = -1
  41 };
  42
  43 struct DnsResourceKey {
  44         unsigned n_ref;
  45         uint16_t class, type;
  46         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
  47 };
  48
  49 struct DnsResourceRecord {
  50         unsigned n_ref;
  51         DnsResourceKey *key;
  52         uint32_t ttl;
  53         bool unparseable;
  54         union {
  55                 struct {
  56                         void *data;
  57                         uint16_t size;
  58                 } generic;
  59
  60                 struct {
  61                         uint16_t priority;
  62                         uint16_t weight;
  63                         uint16_t port;
  64                         char *name;
  65                 } srv;
  66
  67                 struct {
  68                         char *name;
  69                 } ptr, ns, cname, dname;
  70
  71                 struct {
  72                         char *cpu;
  73                         char *os;
  74                 } hinfo;
  75
  76                 struct {
  77                         char **strings;
  78                 } txt, spf;
  79
  80                 struct {
  81                         struct in_addr in_addr;
  82                 } a;
  83
  84                 struct {
  85                         struct in6_addr in6_addr;
  86                 } aaaa;
  87
  88                 struct {
  89                         char *mname;
  90                         char *rname;
  91                         uint32_t serial;
  92                         uint32_t refresh;
  93                         uint32_t retry;
  94                         uint32_t expire;
  95                         uint32_t minimum;
  96                 } soa;
  97
  98                 struct {
  99                         uint16_t priority;
 100                         char *exchange;
 101                 } mx;
 102
 103                 struct {
 104                         uint8_t version;
 105                         uint8_t size;
 106                         uint8_t horiz_pre;
 107                         uint8_t vert_pre;
 108                         uint32_t latitude;
 109                         uint32_t longitude;
 110                         uint32_t altitude;
 111                 } loc;
 112
 113                 struct {
 114                         uint8_t algorithm;
 115                         uint8_t fptype;
 116                         void *key;
 117                         size_t key_size;
 118                 } sshfp;
 119
 120                 /* http://tools.ietf.org/html/rfc4034#section-2.1 */
 121                 struct {
 122                         bool zone_key_flag:1;
 123                         bool sep_flag:1;
 124                         uint8_t algorithm;
 125                         void* key;
 126                         size_t key_size;
 127                 } dnskey;
 128         };
 129 };
 130
 131 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 132         if (_unlikely_(!key))
 133                 return NULL;
 134
 135         if (key->_name)
 136                 return key->_name;
 137
 138         return (char*) key + sizeof(DnsResourceKey);
 139 }
 140
 141 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 142 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 143 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 144 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 145 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 146 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 147 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 148 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 149 int dns_resource_key_compare_func(const void *a, const void *b);
 150 int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
 151 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 152
 153 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 154 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
 155 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 156 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 157 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 158 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 159 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
 160 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 161
 162 const char *dns_class_to_string(uint16_t type);
 163 int dns_class_from_string(const char *name, uint16_t *class);