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 };
 124
 125 static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
 126         if (_unlikely_(!key))
 127                 return NULL;
 128
 129         if (key->_name)
 130                 return key->_name;
 131
 132         return (char*) key + sizeof(DnsResourceKey);
 133 }
 134
 135 DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
 136 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
 137 DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
 138 DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
 139 int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
 140 int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr);
 141 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 142 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 143 int dns_resource_key_compare_func(const void *a, const void *b);
 144 int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
 145 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 146
 147 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
 148 DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
 149 DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 150 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 151 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 152 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
 153 int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
 154 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 155
 156 const char *dns_type_to_string(uint16_t type);
 157 int dns_type_from_string(const char *name, uint16_t *type);
 158
 159 const char *dns_class_to_string(uint16_t type);
 160 int dns_class_from_string(const char *name, uint16_t *class);