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Systemd/src/resolve/resolved-dns-rr.h
Lennart Poettering d15ad74251 resolved: NSEC3 hash algorithms are distinct from DS digest algorithms 
Previously, we'd use the same set of identifiers for both, but that's
actually incorrect. It didn't matter much since the only NSEC3 hash
algorithm defined (SHA-1) is mapped to code 1 which is also what it is
encoded as in DS digests, but we really should make sure to use two
distinct enumerations.
2015-12-29 21:42:10 +01:00

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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;
/* 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_ECC_GOST = 12, /* RFC 5933 */
DNSSEC_ALGORITHM_ECDSAP256SHA256 = 13, /* RFC 6605 */
DNSSEC_ALGORITHM_ECDSAP384SHA384 = 14, /* RFC 6605 */
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, /* RFC 4509 */
DNSSEC_DIGEST_GOST_R_34_11_94 = 3, /* RFC 5933 */
DNSSEC_DIGEST_SHA384 = 4, /* RFC 6605 */
_DNSSEC_DIGEST_MAX_DEFINED
};
/* DNSSEC NSEC3 hash algorithms, see
* https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml */
enum {
NSEC3_ALGORITHM_SHA1 = 1,
_NSEC3_ALGORITHM_MAX_DEFINED
};
struct DnsResourceKey {
unsigned n_ref;
uint16_t class, type;
char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
};
/* 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;
char *to_string;
uint32_t ttl;
usec_t expiry; /* RRSIG signature expiry */
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;
/* https://tools.ietf.org/html/rfc1876 */
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;
/* 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;
/* https://tools.ietf.org/html/rfc4034#section-5.1 */
struct {
uint16_t key_tag;
uint8_t algorithm;
uint8_t digest_type;
void *digest;
size_t digest_size;
} ds;
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, 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);
const char* dns_resource_record_to_string(DnsResourceRecord *rr);
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);
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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