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         _DNS_CLASS_MAX,
  39         _DNS_CLASS_INVALID = -1
  40 };
  41
  42 /* DNS record types, see RFC 1035 */
  43 enum {
  44         /* Normal records */
  45         DNS_TYPE_A     = 0x01,
  46         DNS_TYPE_NS    = 0x02,
  47         DNS_TYPE_CNAME = 0x05,
  48         DNS_TYPE_SOA   = 0x06,
  49         DNS_TYPE_PTR   = 0x0C,
  50         DNS_TYPE_HINFO = 0x0D,
  51         DNS_TYPE_MX    = 0x0F,
  52         DNS_TYPE_TXT   = 0x10,
  53         DNS_TYPE_AAAA  = 0x1C,
  54         DNS_TYPE_SRV   = 0x21,
  55         DNS_TYPE_DNAME = 0x27,
  56         DNS_TYPE_SSHFP = 0x2C,
  57
  58         /* Special records */
  59         DNS_TYPE_ANY   = 0xFF,
  60         DNS_TYPE_OPT   = 0x29,      /* EDNS0 option */
  61         DNS_TYPE_TKEY  = 0xF9,
  62         DNS_TYPE_TSIG  = 0xFA,
  63         DNS_TYPE_IXFR  = 0xFB,
  64         DNS_TYPE_AXFR  = 0xFC,
  65         _DNS_TYPE_MAX,
  66         _DNS_TYPE_INVALID = -1
  67 };
  68
  69 struct DnsResourceKey {
  70         unsigned n_ref;
  71         uint16_t class, type;
  72         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
  73 };
  74
  75 struct DnsResourceRecord {
  76         unsigned n_ref;
  77         DnsResourceKey *key;
  78         uint32_t ttl;
  79         union {
  80                 struct {
  81                         void *data;
  82                         uint16_t size;
  83                 } generic;
  84
  85                 /* struct { */
  86                 /*         uint16_t priority; */
  87                 /*         uint16_t weight; */
  88                 /*         uint16_t port; */
  89                 /*         char *name; */
  90                 /* } srv; */
  91
  92                 struct {
  93                         char *name;
  94                 } ptr, ns, cname;
  95
  96                 struct {
  97                         char *cpu;
  98                         char *os;
  99                 } hinfo;
 100
 101                 /* struct { */
 102                 /*         char **list; */
 103                 /* } txt; */
 104
 105                 struct {
 106                         struct in_addr in_addr;
 107                 } a;
 108
 109                 struct {
 110                         struct in6_addr in6_addr;
 111                 } aaaa;
 112
 113                 struct {
 114                         char *mname;
 115                         char *rname;
 116                         uint32_t serial;
 117                         uint32_t refresh;
 118                         uint32_t retry;
 119                         uint32_t expire;
 120                         uint32_t minimum;
 121                 } soa;
 122
 123                 struct {
 124                         uint16_t priority;
 125                         char *exchange;
 126                 } mx;
 127         };
 128 };
 129
 130 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 131         if (_unlikely_(!key))
 132                 return NULL;
 133
 134         if (key->_name)
 135                 return key->_name;
 136
 137         return (char*) key + sizeof(DnsResourceKey);
 138 }
 139
 140 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 141 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 142 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 143 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 144 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 145 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 146 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 147 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 148 int dns_resource_key_compare_func(const void *a, const void *b);
 149 int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
 150 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 151
 152 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 153 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
 154 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 155 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 156 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 157 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 158 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
 159 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 160
 161 const char *dns_type_to_string(uint16_t type);
 162 int dns_type_from_string(const char *name, uint16_t *type);
 163
 164 const char *dns_class_to_string(uint16_t type);
 165 int dns_class_from_string(const char *name, uint16_t *class);