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                 struct {
 109                         char *mname;
 110                         char *rname;
 111                         uint32_t serial;
 112                         uint32_t refresh;
 113                         uint32_t retry;
 114                         uint32_t expire;
 115                         uint32_t minimum;
 116                 } soa;
 117         };
 118 };
 119
 120 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 121         if (_unlikely_(!key))
 122                 return NULL;
 123
 124         if (key->_name)
 125                 return key->_name;
 126
 127         return (char*) key + sizeof(DnsResourceKey);
 128 }
 129
 130 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 131 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 132 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 133 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 134 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 135 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 136 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 137 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 138 int dns_resource_key_compare_func(const void *a, const void *b);
 139 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 140
 141 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 142 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 143 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 144 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 145 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 146
 147 const char *dns_type_to_string(uint16_t type);
 148 const char *dns_class_to_string(uint16_t type);