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_LOC   = 0x1D,
  55         DNS_TYPE_SRV   = 0x21,
  56         DNS_TYPE_DNAME = 0x27,
  57         DNS_TYPE_SSHFP = 0x2C,
  58         DNS_TYPE_SPF   = 0x63,
  59
  60         /* Special records */
  61         DNS_TYPE_ANY   = 0xFF,
  62         DNS_TYPE_OPT   = 0x29,      /* EDNS0 option */
  63         DNS_TYPE_TKEY  = 0xF9,
  64         DNS_TYPE_TSIG  = 0xFA,
  65         DNS_TYPE_IXFR  = 0xFB,
  66         DNS_TYPE_AXFR  = 0xFC,
  67         _DNS_TYPE_MAX,
  68         _DNS_TYPE_INVALID = -1
  69 };
  70
  71 struct DnsResourceKey {
  72         unsigned n_ref;
  73         uint16_t class, type;
  74         char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
  75 };
  76
  77 struct DnsResourceRecord {
  78         unsigned n_ref;
  79         DnsResourceKey *key;
  80         uint32_t ttl;
  81         bool unparseable;
  82         union {
  83                 struct {
  84                         void *data;
  85                         uint16_t size;
  86                 } generic;
  87
  88                 struct {
  89                         uint16_t priority;
  90                         uint16_t weight;
  91                         uint16_t port;
  92                         char *name;
  93                 } srv;
  94
  95                 struct {
  96                         char *name;
  97                 } ptr, ns, cname, dname;
  98
  99                 struct {
 100                         char *cpu;
 101                         char *os;
 102                 } hinfo;
 103
 104                 struct {
 105                         char **strings;
 106                 } txt, spf;
 107
 108                 struct {
 109                         struct in_addr in_addr;
 110                 } a;
 111
 112                 struct {
 113                         struct in6_addr in6_addr;
 114                 } aaaa;
 115
 116                 struct {
 117                         char *mname;
 118                         char *rname;
 119                         uint32_t serial;
 120                         uint32_t refresh;
 121                         uint32_t retry;
 122                         uint32_t expire;
 123                         uint32_t minimum;
 124                 } soa;
 125
 126                 struct {
 127                         uint16_t priority;
 128                         char *exchange;
 129                 } mx;
 130
 131                 struct {
 132                         uint8_t version;
 133                         uint8_t size;
 134                         uint8_t horiz_pre;
 135                         uint8_t vert_pre;
 136                         uint32_t latitude;
 137                         uint32_t longitude;
 138                         uint32_t altitude;
 139                 } loc;
 140
 141                 struct {
 142                         uint8_t algorithm;
 143                         uint8_t fptype;
 144                         void *key;
 145                         size_t key_size;
 146                 } sshfp;
 147         };
 148 };
 149
 150 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 151         if (_unlikely_(!key))
 152                 return NULL;
 153
 154         if (key->_name)
 155                 return key->_name;
 156
 157         return (char*) key + sizeof(DnsResourceKey);
 158 }
 159
 160 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 161 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 162 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 163 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 164 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 165 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 166 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 167 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 168 int dns_resource_key_compare_func(const void *a, const void *b);
 169 int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
 170 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 171
 172 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 173 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
 174 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 175 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 176 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 177 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 178 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
 179 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 180
 181 const char *dns_type_to_string(uint16_t type);
 182 int dns_type_from_string(const char *name, uint16_t *type);
 183
 184 const char *dns_class_to_string(uint16_t type);
 185 int dns_class_from_string(const char *name, uint16_t *class);