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
  30 typedef struct DnsResourceKey DnsResourceKey;
  31 typedef struct DnsResourceRecord DnsResourceRecord;
  32
  33 /* DNS record classes, see RFC 1035 */
  34 enum {
  35         DNS_CLASS_IN   = 0x01,
  36         DNS_CLASS_ANY  = 0xFF,
  37 };
  38
  39 /* DNS record types, see RFC 1035 */
  40 enum {
  41         /* Normal records */
  42         DNS_TYPE_A     = 0x01,
  43         DNS_TYPE_NS    = 0x02,
  44         DNS_TYPE_CNAME = 0x05,
  45         DNS_TYPE_SOA   = 0x06,
  46         DNS_TYPE_PTR   = 0x0C,
  47         DNS_TYPE_HINFO = 0x0D,
  48         DNS_TYPE_MX    = 0x0F,
  49         DNS_TYPE_TXT   = 0x10,
  50         DNS_TYPE_AAAA  = 0x1C,
  51         DNS_TYPE_SRV   = 0x21,
  52         DNS_TYPE_SSHFP = 0x2C,
  53         DNS_TYPE_DNAME = 0x27,
  54
  55         /* Special records */
  56         DNS_TYPE_ANY   = 0xFF,
  57         DNS_TYPE_OPT   = 0x29,      /* EDNS0 option */
  58         DNS_TYPE_TKEY  = 0xF9,
  59         DNS_TYPE_TSIG  = 0xFA,
  60         DNS_TYPE_IXFR  = 0xFB,
  61         DNS_TYPE_AXFR  = 0xFC,
  62 };
  63
  64 struct DnsResourceKey {
  65         unsigned n_ref;
  66         uint16_t class, type;
  67         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
  68 };
  69
  70 struct DnsResourceRecord {
  71         unsigned n_ref;
  72         DnsResourceKey *key;
  73         uint32_t ttl;
  74         union {
  75                 struct {
  76                         void *data;
  77                         uint16_t size;
  78                 } generic;
  79
  80                 /* struct { */
  81                 /*         uint16_t priority; */
  82                 /*         uint16_t weight; */
  83                 /*         uint16_t port; */
  84                 /*         char *name; */
  85                 /* } srv; */
  86
  87                 struct {
  88                         char *name;
  89                 } ptr, ns, cname;
  90
  91                 struct {
  92                         char *cpu;
  93                         char *os;
  94                 } hinfo;
  95
  96                 /* struct { */
  97                 /*         char **list; */
  98                 /* } txt; */
  99
 100                 struct {
 101                         struct in_addr in_addr;
 102                 } a;
 103
 104                 struct {
 105                         struct in6_addr in6_addr;
 106                 } aaaa;
 107         };
 108 };
 109
 110 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 111         if (_unlikely_(!key))
 112                 return NULL;
 113
 114         if (key->_name)
 115                 return key->_name;
 116
 117         return (char*) key + sizeof(DnsResourceKey);
 118 }
 119
 120 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 121 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 122 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 123 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 124 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 125 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 126 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 127 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 128 int dns_resource_key_compare_func(const void *a, const void *b);
 129 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 130
 131 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 132 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 133 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 134 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 135 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 136
 137 const char *dns_type_to_string(uint16_t type);
 138 const char *dns_class_to_string(uint16_t type);