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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <netinet/in.h>
#include "bitmap.h"
#include "dns-type.h"
#include "hashmap.h"
#include "in-addr-util.h"
#include "list.h"
typedef struct DnsResourceKey DnsResourceKey;
typedef struct DnsResourceRecord DnsResourceRecord;
typedef struct DnsTxtItem DnsTxtItem;
/* DNS record classes, see RFC 1035 */
enum {
DNS_CLASS_IN = 0x01,
DNS_CLASS_ANY = 0xFF,
_DNS_CLASS_MAX,
_DNS_CLASS_INVALID = -1
};
/* DNSKEY RR flags */
#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
#define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
/* mDNS RR flags */
#define MDNS_RR_CACHE_FLUSH (UINT16_C(1) << 15)
/* DNSSEC algorithm identifiers, see
* http://tools.ietf.org/html/rfc4034#appendix-A.1 and
* https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
enum {
DNSSEC_ALGORITHM_RSAMD5 = 1,
DNSSEC_ALGORITHM_DH,
DNSSEC_ALGORITHM_DSA,
DNSSEC_ALGORITHM_ECC,
DNSSEC_ALGORITHM_RSASHA1,
DNSSEC_ALGORITHM_DSA_NSEC3_SHA1,
DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1,
DNSSEC_ALGORITHM_RSASHA256 = 8, /* RFC 5702 */
DNSSEC_ALGORITHM_RSASHA512 = 10, /* RFC 5702 */
DNSSEC_ALGORITHM_INDIRECT = 252,
DNSSEC_ALGORITHM_PRIVATEDNS,
DNSSEC_ALGORITHM_PRIVATEOID,
_DNSSEC_ALGORITHM_MAX_DEFINED
};
/* DNSSEC digest identifiers, see
* https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
enum {
DNSSEC_DIGEST_SHA1 = 1,
DNSSEC_DIGEST_SHA256 = 2,
_DNSSEC_DIGEST_MAX_DEFINED
};
struct DnsResourceKey {
unsigned n_ref;
uint16_t class, type;
char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
bool cache_flush:1;
};
/* Creates a temporary resource key. This is only useful to quickly
* look up something, without allocating a full DnsResourceKey object
* for it. Note that it is not OK to take references to this kind of
* resource key object. */
#define DNS_RESOURCE_KEY_CONST(c, t, n) \
((DnsResourceKey) { \
.n_ref = (unsigned) -1, \
.class = c, \
.type = t, \
._name = (char*) n, \
})
struct DnsTxtItem {
size_t length;
LIST_FIELDS(DnsTxtItem, items);
uint8_t data[];
};
struct DnsResourceRecord {
unsigned n_ref;
DnsResourceKey *key;
uint32_t ttl;
bool unparseable:1;
bool wire_format_canonical:1;
void *wire_format;
size_t wire_format_size;
size_t wire_format_rdata_offset;
union {
struct {
void *data;
size_t size;
} generic, opt;
struct {
uint16_t priority;
uint16_t weight;
uint16_t port;
char *name;
} srv;
struct {
char *name;
} ptr, ns, cname, dname;
struct {
char *cpu;
char *os;
} hinfo;
struct {
DnsTxtItem *items;
} txt, spf;
struct {
struct in_addr in_addr;
} a;
struct {
struct in6_addr in6_addr;
} aaaa;
struct {
char *mname;
char *rname;
uint32_t serial;
uint32_t refresh;
uint32_t retry;
uint32_t expire;
uint32_t minimum;
} soa;
struct {
uint16_t priority;
char *exchange;
} mx;
struct {
uint8_t version;
uint8_t size;
uint8_t horiz_pre;
uint8_t vert_pre;
uint32_t latitude;
uint32_t longitude;
uint32_t altitude;
} loc;
struct {
uint16_t key_tag;
uint8_t algorithm;
uint8_t digest_type;
void *digest;
size_t digest_size;
} ds;
/* https://tools.ietf.org/html/rfc4255#section-3.1 */
struct {
uint8_t algorithm;
uint8_t fptype;
void *fingerprint;
size_t fingerprint_size;
} sshfp;
/* http://tools.ietf.org/html/rfc4034#section-2.1 */
struct {
uint16_t flags;
uint8_t protocol;
uint8_t algorithm;
void* key;
size_t key_size;
} dnskey;
/* http://tools.ietf.org/html/rfc4034#section-3.1 */
struct {
uint16_t type_covered;
uint8_t algorithm;
uint8_t labels;
uint32_t original_ttl;
uint32_t expiration;
uint32_t inception;
uint16_t key_tag;
char *signer;
void *signature;
size_t signature_size;
} rrsig;
/* https://tools.ietf.org/html/rfc4034#section-4.1 */
struct {
char *next_domain_name;
Bitmap *types;
} nsec;
struct {
uint8_t algorithm;
uint8_t flags;
uint16_t iterations;
void *salt;
size_t salt_size;
void *next_hashed_name;
size_t next_hashed_name_size;
Bitmap *types;
} nsec3;
};
};
static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
if (_unlikely_(!key))
return NULL;
if (key->_name)
return key->_name;
return (char*) key + sizeof(DnsResourceKey);
}
DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname);
int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name);
DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
bool dns_resource_key_is_address(const DnsResourceKey *key);
int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b);
int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain);
int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain);
int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa);
int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
static inline bool dns_key_is_shared(const DnsResourceKey *key) {
return IN_SET(key->type, DNS_TYPE_PTR);
}
DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical);
DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i);
bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
const char *dns_class_to_string(uint16_t type);
int dns_class_from_string(const char *name, uint16_t *class);
extern const struct hash_ops dns_resource_key_hash_ops;
const char* dnssec_algorithm_to_string(int i) _const_;
int dnssec_algorithm_from_string(const char *s) _pure_;
const char *dnssec_digest_to_string(int i) _const_;
int dnssec_digest_from_string(const char *s) _pure_;
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