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 };
  39
  40 /* DNS record types, see RFC 1035 */
  41 enum {
  42         /* Normal records */
  43         DNS_TYPE_A     = 0x01,
  44         DNS_TYPE_NS    = 0x02,
  45         DNS_TYPE_CNAME = 0x05,
  46         DNS_TYPE_SOA   = 0x06,
  47         DNS_TYPE_PTR   = 0x0C,
  48         DNS_TYPE_HINFO = 0x0D,
  49         DNS_TYPE_MX    = 0x0F,
  50         DNS_TYPE_TXT   = 0x10,
  51         DNS_TYPE_AAAA  = 0x1C,
  52         DNS_TYPE_SRV   = 0x21,
  53         DNS_TYPE_DNAME = 0x27,
  54         DNS_TYPE_SSHFP = 0x2C,
  55
  56         /* Special records */
  57         DNS_TYPE_ANY   = 0xFF,
  58         DNS_TYPE_OPT   = 0x29,      /* EDNS0 option */
  59         DNS_TYPE_TKEY  = 0xF9,
  60         DNS_TYPE_TSIG  = 0xFA,
  61         DNS_TYPE_IXFR  = 0xFB,
  62         DNS_TYPE_AXFR  = 0xFC,
  63 };
  64
  65 struct DnsResourceKey {
  66         unsigned n_ref;
  67         uint16_t class, type;
  68         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
  69 };
  70
  71 struct DnsResourceRecord {
  72         unsigned n_ref;
  73         DnsResourceKey *key;
  74         uint32_t ttl;
  75         union {
  76                 struct {
  77                         void *data;
  78                         uint16_t size;
  79                 } generic;
  80
  81                 /* struct { */
  82                 /*         uint16_t priority; */
  83                 /*         uint16_t weight; */
  84                 /*         uint16_t port; */
  85                 /*         char *name; */
  86                 /* } srv; */
  87
  88                 struct {
  89                         char *name;
  90                 } ptr, ns, cname;
  91
  92                 struct {
  93                         char *cpu;
  94                         char *os;
  95                 } hinfo;
  96
  97                 /* struct { */
  98                 /*         char **list; */
  99                 /* } txt; */
 100
 101                 struct {
 102                         struct in_addr in_addr;
 103                 } a;
 104
 105                 struct {
 106                         struct in6_addr in6_addr;
 107                 } aaaa;
 108
 109                 struct {
 110                         char *mname;
 111                         char *rname;
 112                         uint32_t serial;
 113                         uint32_t refresh;
 114                         uint32_t retry;
 115                         uint32_t expire;
 116                         uint32_t minimum;
 117                 } soa;
 118         };
 119 };
 120
 121 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 122         if (_unlikely_(!key))
 123                 return NULL;
 124
 125         if (key->_name)
 126                 return key->_name;
 127
 128         return (char*) key + sizeof(DnsResourceKey);
 129 }
 130
 131 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 132 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 133 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 134 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 135 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 136 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 137 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 138 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 139 int dns_resource_key_compare_func(const void *a, const void *b);
 140 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 141
 142 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 143 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
 144 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 145 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 146 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 147 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 148 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 149
 150 const char *dns_type_to_string(uint16_t type);
 151 const char *dns_class_to_string(uint16_t type);