[thirdparty/systemd.git] / src / resolve / resolved-dns-rr.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include <netinet/in.h>

#include "bitmap.h"
#include "dns-def.h"
#include "dns-type.h"
#include "hashmap.h"
#include "in-addr-util.h"
#include "list.h"
#include "string-util.h"
#include "time-util.h"

typedef struct DnsResourceKey DnsResourceKey;
typedef struct DnsResourceRecord DnsResourceRecord;
typedef struct DnsTxtItem DnsTxtItem;

/* DNSKEY RR flags */
#define DNSKEY_FLAG_SEP            (UINT16_C(1) << 0)
#define DNSKEY_FLAG_REVOKE         (UINT16_C(1) << 7)
#define DNSKEY_FLAG_ZONE_KEY       (UINT16_C(1) << 8)

/* mDNS RR flags */
#define MDNS_RR_CACHE_FLUSH_OR_QU  (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_ED25519 = 15,         /* RFC 8080 */
        DNSSEC_ALGORITHM_ED448 = 16,           /* RFC 8080 */
        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; /* (unsigned -1) for const keys, see below */
        uint16_t class, type;
        char *_name; /* don't access directly, 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 = UINT_MAX,                      \
                .class = c,                             \
                .type = t,                              \
                ._name = (char*) n,                     \
        })

struct DnsTxtItem {
        size_t length;
        LIST_FIELDS(DnsTxtItem, items);
        uint8_t data[];
};

struct DnsResourceRecord {
        unsigned n_ref;
        uint32_t ttl;
        usec_t expiry; /* RRSIG signature expiry */

        DnsResourceKey *key;

        char *to_string;

        /* How many labels to strip to determine "signer" of the RRSIG (aka, the zone). -1 if not signed. */
        uint8_t n_skip_labels_signer;
        /* How many labels to strip to determine "synthesizing source" of this RR, i.e. the wildcard's immediate parent. -1 if not signed. */
        uint8_t n_skip_labels_source;

        bool unparsable;
        bool wire_format_canonical;

        void *wire_format;
        size_t wire_format_size;
        size_t wire_format_rdata_offset;

        union {
                struct {
                        void *data;
                        size_t data_size;
                } generic, opt;

                struct {
                        char *name;
                        uint16_t priority;
                        uint16_t weight;
                        uint16_t port;
                } 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 {
                        char *exchange;
                        uint16_t priority;
                } 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 {
                        void *fingerprint;
                        size_t fingerprint_size;

                        uint8_t algorithm;
                        uint8_t fptype;
                } sshfp;

                /* http://tools.ietf.org/html/rfc4034#section-2.1 */
                struct {
                        void* key;
                        size_t key_size;

                        uint16_t flags;
                        uint8_t protocol;
                        uint8_t algorithm;
                } dnskey;

                /* http://tools.ietf.org/html/rfc4034#section-3.1 */
                struct {
                        char *signer;
                        void *signature;
                        size_t signature_size;

                        uint16_t type_covered;
                        uint8_t algorithm;
                        uint8_t labels;
                        uint32_t original_ttl;
                        uint32_t expiration;
                        uint32_t inception;
                        uint16_t key_tag;
                } 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 {
                        void *digest;
                        size_t digest_size;

                        uint16_t key_tag;
                        uint8_t algorithm;
                        uint8_t digest_type;
                } ds;

                struct {
                        Bitmap *types;
                        void *salt;
                        size_t salt_size;
                        void *next_hashed_name;
                        size_t next_hashed_name_size;

                        uint8_t algorithm;
                        uint8_t flags;
                        uint16_t iterations;
                } nsec3;

                /* https://tools.ietf.org/html/draft-ietf-dane-protocol-23 */
                struct {
                        void *data;
                        size_t data_size;

                        uint8_t cert_usage;
                        uint8_t selector;
                        uint8_t matching_type;
                } tlsa;

                /* https://tools.ietf.org/html/rfc6844 */
                struct {
                        char *tag;
                        void *value;
                        size_t value_size;

                        uint8_t flags;
                } caa;
        };

        /* Note: fields should be ordered to minimize alignment gaps. Use pahole! */
};

/* We use uint8_t for label counts above, and UINT8_MAX/-1 has special meaning. */
assert_cc(DNS_N_LABELS_MAX < UINT8_MAX);

static inline const void* DNS_RESOURCE_RECORD_RDATA(const DnsResourceRecord *rr) {
        if (!rr)
                return NULL;

        if (!rr->wire_format)
                return NULL;

        assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
        return (uint8_t*) rr->wire_format + rr->wire_format_rdata_offset;
}

static inline size_t DNS_RESOURCE_RECORD_RDATA_SIZE(const DnsResourceRecord *rr) {
        if (!rr)
                return 0;
        if (!rr->wire_format)
                return 0;

        assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
        return rr->wire_format_size - rr->wire_format_rdata_offset;
}

static inline uint8_t DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(const DnsResourceRecord *rr) {
        assert(rr);
        assert(rr->key->type == DNS_TYPE_OPT);

        return ((rr->ttl >> 16) & 0xFF) == 0;
}

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);

#define DNS_RESOURCE_KEY_REPLACE(a, b)          \
        do {                                    \
                typeof(a)* _a = &(a);           \
                typeof(b) _b = (b);             \
                dns_resource_key_unref(*_a);    \
                *_a = _b;                       \
        } while(0)

const char* dns_resource_key_name(const DnsResourceKey *key);
bool dns_resource_key_is_address(const DnsResourceKey *key);
bool dns_resource_key_is_dnssd_ptr(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);

/* _DNS_{CLASS,TYPE}_STRING_MAX include one byte for NUL, which we use for space instead below.
 * DNS_HOSTNAME_MAX does not include the NUL byte, so we need to add 1. */
#define DNS_RESOURCE_KEY_STRING_MAX (_DNS_CLASS_STRING_MAX + _DNS_TYPE_STRING_MAX + DNS_HOSTNAME_MAX + 1)

char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size);
ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out);

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);
}

bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b);

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);

#define DNS_RR_REPLACE(a, b)                    \
        do {                                    \
                typeof(a)* _a = &(a);           \
                typeof(b) _b = (b);             \
                dns_resource_record_unref(*_a); \
                *_a = _b;                       \
        } while(0)

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_payload_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);

const char* dns_resource_record_to_string(DnsResourceRecord *rr);
DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);

int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical);

int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret);
int dns_resource_record_source(DnsResourceRecord *rr, const char **ret);
int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone);
int dns_resource_record_is_synthetic(DnsResourceRecord *rr);

int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl);

bool dns_resource_record_is_link_local_address(DnsResourceRecord *rr);

int dns_resource_record_get_cname_target(DnsResourceKey *key, DnsResourceRecord *cname, char **ret);

DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i);
bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
DnsTxtItem *dns_txt_item_copy(DnsTxtItem *i);
int dns_txt_item_new_empty(DnsTxtItem **ret);

void dns_resource_record_hash_func(const DnsResourceRecord *i, struct siphash *state);
int dns_resource_record_compare_func(const DnsResourceRecord *x, const DnsResourceRecord *y);

extern const struct hash_ops dns_resource_key_hash_ops;
extern const struct hash_ops dns_resource_record_hash_ops;

int dnssec_algorithm_to_string_alloc(int i, char **ret);
int dnssec_algorithm_from_string(const char *s) _pure_;

int dnssec_digest_to_string_alloc(int i, char **ret);
int dnssec_digest_from_string(const char *s) _pure_;
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
74b2466e LP	2	#pragma once
74b2466e LP	3
74b2466e LP	4	#include <netinet/in.h>
74b2466e LP	5
50f1e641	6	#include "bitmap.h"
98e80bf9	7	#include "dns-def.h"
71d35b6b	8	#include "dns-type.h"
322345fd	9	#include "hashmap.h"
623a4c97	10	#include "in-addr-util.h"
2001c805	11	#include "list.h"
1c02e7ba	12	#include "string-util.h"
ca78ad1d	13	#include "time-util.h"
74b2466e LP	14
	15	typedef struct DnsResourceKey DnsResourceKey;
	16	typedef struct DnsResourceRecord DnsResourceRecord;
2001c805	17	typedef struct DnsTxtItem DnsTxtItem;
74b2466e	18
8730bccf	19	/* DNSKEY RR flags */
82d39576 SB	20	#define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
	21	#define DNSKEY_FLAG_REVOKE (UINT16_C(1) << 7)
	22	#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
8730bccf	23
23502de3	24	/* mDNS RR flags */
82d39576	25	#define MDNS_RR_CACHE_FLUSH_OR_QU (UINT16_C(1) << 15)
23502de3	26
8730bccf LP	27	/* DNSSEC algorithm identifiers, see
	28	* http://tools.ietf.org/html/rfc4034#appendix-A.1 and
	29	* https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
	30	enum {
	31	DNSSEC_ALGORITHM_RSAMD5 = 1,
	32	DNSSEC_ALGORITHM_DH,
	33	DNSSEC_ALGORITHM_DSA,
	34	DNSSEC_ALGORITHM_ECC,
	35	DNSSEC_ALGORITHM_RSASHA1,
	36	DNSSEC_ALGORITHM_DSA_NSEC3_SHA1,
	37	DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1,
6f717d08 LP	38	DNSSEC_ALGORITHM_RSASHA256 = 8, /* RFC 5702 */
	39	DNSSEC_ALGORITHM_RSASHA512 = 10, /* RFC 5702 */
	40	DNSSEC_ALGORITHM_ECC_GOST = 12, /* RFC 5933 */
e0240c64 LP	41	DNSSEC_ALGORITHM_ECDSAP256SHA256 = 13, /* RFC 6605 */
e0240c64 LP	42	DNSSEC_ALGORITHM_ECDSAP384SHA384 = 14, /* RFC 6605 */
cb9eeb06 MCO	43	DNSSEC_ALGORITHM_ED25519 = 15, /* RFC 8080 */
cb9eeb06 MCO	44	DNSSEC_ALGORITHM_ED448 = 16, /* RFC 8080 */
8730bccf LP	45	DNSSEC_ALGORITHM_INDIRECT = 252,
	46	DNSSEC_ALGORITHM_PRIVATEDNS,
	47	DNSSEC_ALGORITHM_PRIVATEOID,
	48	_DNSSEC_ALGORITHM_MAX_DEFINED
	49	};
	50
	51	/* DNSSEC digest identifiers, see
	52	* https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
	53	enum {
	54	DNSSEC_DIGEST_SHA1 = 1,
6f717d08 LP	55	DNSSEC_DIGEST_SHA256 = 2, /* RFC 4509 */
	56	DNSSEC_DIGEST_GOST_R_34_11_94 = 3, /* RFC 5933 */
	57	DNSSEC_DIGEST_SHA384 = 4, /* RFC 6605 */
8730bccf LP	58	_DNSSEC_DIGEST_MAX_DEFINED
	59	};
	60
d15ad742 LP	61	/* DNSSEC NSEC3 hash algorithms, see
	62	* https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml */
	63	enum {
	64	NSEC3_ALGORITHM_SHA1 = 1,
	65	_NSEC3_ALGORITHM_MAX_DEFINED
	66	};
	67
74b2466e	68	struct DnsResourceKey {
f57e3cd5	69	unsigned n_ref; /* (unsigned -1) for const keys, see below */
faa133f3	70	uint16_t class, type;
96d49011	71	char _name; / don't access directly, use dns_resource_key_name()! */
74b2466e LP	72	};
74b2466e LP	73
1b4f6e79 LP	74	/* Creates a temporary resource key. This is only useful to quickly
	75	* look up something, without allocating a full DnsResourceKey object
	76	* for it. Note that it is not OK to take references to this kind of
	77	* resource key object. */
	78	#define DNS_RESOURCE_KEY_CONST(c, t, n) \
	79	((DnsResourceKey) { \
f5fbe71d	80	.n_ref = UINT_MAX, \
1b4f6e79 LP	81	.class = c, \
	82	.type = t, \
	83	._name = (char*) n, \
	84	})
	85
2001c805 LP	86	struct DnsTxtItem {
	87	size_t length;
	88	LIST_FIELDS(DnsTxtItem, items);
	89	uint8_t data[];
	90	};
	91
74b2466e LP	92	struct DnsResourceRecord {
74b2466e LP	93	unsigned n_ref;
a6e890d4 ZJS	94	uint32_t ttl;
	95	usec_t expiry; /* RRSIG signature expiry */
	96
faa133f3	97	DnsResourceKey *key;
97c67192	98
7b50eb2e	99	char *to_string;
97c67192	100
97c67192	101	/* How many labels to strip to determine "signer" of the RRSIG (aka, the zone). -1 if not signed. */
98e80bf9	102	uint8_t n_skip_labels_signer;
97c67192	103	/* How many labels to strip to determine "synthesizing source" of this RR, i.e. the wildcard's immediate parent. -1 if not signed. */
98e80bf9	104	uint8_t n_skip_labels_source;
97c67192	105
a6e890d4 ZJS	106	bool unparsable;
a6e890d4 ZJS	107	bool wire_format_canonical;
97c67192	108
a8812dd7 LP	109	void *wire_format;
	110	size_t wire_format_size;
	111	size_t wire_format_rdata_offset;
97c67192	112
74b2466e LP	113	union {
	114	struct {
	115	void *data;
a43a068a	116	size_t data_size;
d75acfb0	117	} generic, opt;
74b2466e	118
9c92ce6d	119	struct {
a6e890d4	120	char *name;
9c92ce6d LP	121	uint16_t priority;
	122	uint16_t weight;
	123	uint16_t port;
9c92ce6d	124	} srv;
74b2466e LP	125
	126	struct {
	127	char *name;
8ac4e9e1	128	} ptr, ns, cname, dname;
74b2466e LP	129
	130	struct {
	131	char *cpu;
	132	char *os;
	133	} hinfo;
	134
2e276efc	135	struct {
2001c805	136	DnsTxtItem *items;
c0eb11cf	137	} txt, spf;
74b2466e LP	138
	139	struct {
	140	struct in_addr in_addr;
	141	} a;
	142
	143	struct {
	144	struct in6_addr in6_addr;
	145	} aaaa;
7e8e0422 LP	146
	147	struct {
	148	char *mname;
	149	char *rname;
	150	uint32_t serial;
	151	uint32_t refresh;
	152	uint32_t retry;
	153	uint32_t expire;
	154	uint32_t minimum;
	155	} soa;
946c7094 ZJS	156
946c7094 ZJS	157	struct {
946c7094	158	char *exchange;
a6e890d4	159	uint16_t priority;
946c7094	160	} mx;
0dae31d4	161
6af47493	162	/* https://tools.ietf.org/html/rfc1876 */
0dae31d4 ZJS	163	struct {
	164	uint8_t version;
	165	uint8_t size;
	166	uint8_t horiz_pre;
	167	uint8_t vert_pre;
	168	uint32_t latitude;
	169	uint32_t longitude;
	170	uint32_t altitude;
	171	} loc;
42cc2eeb	172
549c1a25	173	/* https://tools.ietf.org/html/rfc4255#section-3.1 */
42cc2eeb	174	struct {
549c1a25 TG	175	void *fingerprint;
549c1a25 TG	176	size_t fingerprint_size;
a6e890d4 ZJS	177
	178	uint8_t algorithm;
	179	uint8_t fptype;
42cc2eeb	180	} sshfp;
8db0d2f5 ZJS	181
	182	/* http://tools.ietf.org/html/rfc4034#section-2.1 */
	183	struct {
a6e890d4 ZJS	184	void* key;
	185	size_t key_size;
	186
f91dc240 LP	187	uint16_t flags;
f91dc240 LP	188	uint8_t protocol;
8db0d2f5	189	uint8_t algorithm;
8db0d2f5	190	} dnskey;
151226ab ZJS	191
	192	/* http://tools.ietf.org/html/rfc4034#section-3.1 */
	193	struct {
a6e890d4 ZJS	194	char *signer;
	195	void *signature;
	196	size_t signature_size;
	197
151226ab ZJS	198	uint16_t type_covered;
	199	uint8_t algorithm;
	200	uint8_t labels;
	201	uint32_t original_ttl;
	202	uint32_t expiration;
	203	uint32_t inception;
	204	uint16_t key_tag;
151226ab	205	} rrsig;
50f1e641	206
9ead3519	207	/* https://tools.ietf.org/html/rfc4034#section-4.1 */
50f1e641 TG	208	struct {
	209	char *next_domain_name;
	210	Bitmap *types;
	211	} nsec;
5d45a880	212
6af47493 LP	213	/* https://tools.ietf.org/html/rfc4034#section-5.1 */
6af47493 LP	214	struct {
a6e890d4 ZJS	215	void *digest;
	216	size_t digest_size;
	217
6af47493 LP	218	uint16_t key_tag;
	219	uint8_t algorithm;
	220	uint8_t digest_type;
6af47493 LP	221	} ds;
6af47493 LP	222
5d45a880	223	struct {
a6e890d4	224	Bitmap *types;
5d45a880 TG	225	void *salt;
	226	size_t salt_size;
	227	void *next_hashed_name;
	228	size_t next_hashed_name_size;
a6e890d4 ZJS	229
	230	uint8_t algorithm;
	231	uint8_t flags;
	232	uint16_t iterations;
5d45a880	233	} nsec3;
48d45d2b ZJS	234
	235	/* https://tools.ietf.org/html/draft-ietf-dane-protocol-23 */
	236	struct {
a6e890d4 ZJS	237	void *data;
	238	size_t data_size;
	239
48d45d2b ZJS	240	uint8_t cert_usage;
	241	uint8_t selector;
	242	uint8_t matching_type;
48d45d2b	243	} tlsa;
95052df3 ZJS	244
	245	/* https://tools.ietf.org/html/rfc6844 */
	246	struct {
95052df3 ZJS	247	char *tag;
	248	void *value;
	249	size_t value_size;
a6e890d4 ZJS	250
a6e890d4 ZJS	251	uint8_t flags;
95052df3	252	} caa;
74b2466e	253	};
a6e890d4 ZJS	254
a6e890d4 ZJS	255	/* Note: fields should be ordered to minimize alignment gaps. Use pahole! */
74b2466e LP	256	};
74b2466e LP	257
98e80bf9 ZJS	258	/* We use uint8_t for label counts above, and UINT8_MAX/-1 has special meaning. */
	259	assert_cc(DNS_N_LABELS_MAX < UINT8_MAX);
	260
93bab288	261	static inline const void* DNS_RESOURCE_RECORD_RDATA(const DnsResourceRecord *rr) {
85aeaccc LP	262	if (!rr)
	263	return NULL;
	264
	265	if (!rr->wire_format)
	266	return NULL;
	267
	268	assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
	269	return (uint8_t*) rr->wire_format + rr->wire_format_rdata_offset;
	270	}
	271
93bab288	272	static inline size_t DNS_RESOURCE_RECORD_RDATA_SIZE(const DnsResourceRecord *rr) {
85aeaccc LP	273	if (!rr)
	274	return 0;
	275	if (!rr->wire_format)
	276	return 0;
	277
	278	assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
	279	return rr->wire_format_size - rr->wire_format_rdata_offset;
	280	}
	281
93bab288	282	static inline uint8_t DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(const DnsResourceRecord *rr) {
b30bf55d LP	283	assert(rr);
	284	assert(rr->key->type == DNS_TYPE_OPT);
	285
	286	return ((rr->ttl >> 16) & 0xFF) == 0;
	287	}
	288
faa133f3	289	DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
36d9205d	290	DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey key, const DnsResourceRecord cname);
801ad6a6	291	int dns_resource_key_new_append_suffix(DnsResourceKey *ret, DnsResourceKey key, char *name);
faa133f3 LP	292	DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
	293	DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
	294	DnsResourceKey* dns_resource_key_unref(DnsResourceKey *key);
57318441 ZJS	295
	296	#define DNS_RESOURCE_KEY_REPLACE(a, b) \
	297	do { \
	298	typeof(a)* _a = &(a); \
	299	typeof(b) _b = (b); \
	300	dns_resource_key_unref(*_a); \
	301	*_a = _b; \
	302	} while(0)
	303
1c02e7ba	304	const char* dns_resource_key_name(const DnsResourceKey *key);
28b9b764	305	bool dns_resource_key_is_address(const DnsResourceKey *key);
a2bf8a19	306	bool dns_resource_key_is_dnssd_ptr(const DnsResourceKey *key);
faa133f3	307	int dns_resource_key_equal(const DnsResourceKey a, const DnsResourceKey b);
105e1512	308	int dns_resource_key_match_rr(const DnsResourceKey key, DnsResourceRecord rr, const char *search_domain);
5d27351f	309	int dns_resource_key_match_cname_or_dname(const DnsResourceKey key, const DnsResourceKey cname, const char *search_domain);
547973de	310	int dns_resource_key_match_soa(const DnsResourceKey key, const DnsResourceKey soa);
202b76ae ZJS	311
	312	/* _DNS_{CLASS,TYPE}_STRING_MAX include one byte for NUL, which we use for space instead below.
	313	* DNS_HOSTNAME_MAX does not include the NUL byte, so we need to add 1. */
	314	#define DNS_RESOURCE_KEY_STRING_MAX (_DNS_CLASS_STRING_MAX + _DNS_TYPE_STRING_MAX + DNS_HOSTNAME_MAX + 1)
	315
	316	char* dns_resource_key_to_string(const DnsResourceKey key, char buf, size_t buf_size);
2e74028a ZJS	317	ssize_t dns_resource_record_payload(DnsResourceRecord rr, void *out);
2e74028a ZJS	318
faa133f3	319	DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
322345fd	320
7778dfff DM	321	static inline bool dns_key_is_shared(const DnsResourceKey *key) {
	322	return IN_SET(key->type, DNS_TYPE_PTR);
	323	}
	324
f57e3cd5 LP	325	bool dns_resource_key_reduce(DnsResourceKey a, DnsResourceKey b);
f57e3cd5 LP	326
faa133f3	327	DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
8bf52d3d	328	DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name);
74b2466e LP	329	DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
74b2466e LP	330	DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
7daeec3e ZJS	331
	332	#define DNS_RR_REPLACE(a, b) \
	333	do { \
	334	typeof(a)* _a = &(a); \
	335	typeof(b) _b = (b); \
	336	dns_resource_record_unref(*_a); \
	337	*_a = _b; \
	338	} while(0)
	339
623a4c97	340	int dns_resource_record_new_reverse(DnsResourceRecord *ret, int family, const union in_addr_union address, const char *name);
78c6a153	341	int dns_resource_record_new_address(DnsResourceRecord *ret, int family, const union in_addr_union address, const char *name);
322345fd	342	int dns_resource_record_equal(const DnsResourceRecord a, const DnsResourceRecord b);
51969a58 ZJS	343	int dns_resource_record_payload_equal(const DnsResourceRecord a, const DnsResourceRecord b);
51969a58 ZJS	344
7b50eb2e	345	const char* dns_resource_record_to_string(DnsResourceRecord *rr);
17c8de63	346	DnsResourceRecord dns_resource_record_copy(DnsResourceRecord rr);
faa133f3	347	DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
322345fd	348
a8812dd7 LP	349	int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical);
a8812dd7 LP	350
97c67192 LP	351	int dns_resource_record_signer(DnsResourceRecord rr, const char *ret);
	352	int dns_resource_record_source(DnsResourceRecord rr, const char *ret);
	353	int dns_resource_record_is_signer(DnsResourceRecord rr, const char zone);
ab481675	354	int dns_resource_record_is_synthetic(DnsResourceRecord *rr);
97c67192	355
17c8de63 LP	356	int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl);
17c8de63 LP	357
48662847 LP	358	bool dns_resource_record_is_link_local_address(DnsResourceRecord *rr);
48662847 LP	359
d1f8fbea LP	360	int dns_resource_record_get_cname_target(DnsResourceKey key, DnsResourceRecord cname, char **ret);
d1f8fbea LP	361
2001c805 LP	362	DnsTxtItem dns_txt_item_free_all(DnsTxtItem i);
2001c805 LP	363	bool dns_txt_item_equal(DnsTxtItem a, DnsTxtItem b);
17c8de63	364	DnsTxtItem dns_txt_item_copy(DnsTxtItem i);
ebb779dc	365	int dns_txt_item_new_empty(DnsTxtItem **ret);
2001c805	366
7a08d314	367	void dns_resource_record_hash_func(const DnsResourceRecord i, struct siphash state);
ae45e1a3	368	int dns_resource_record_compare_func(const DnsResourceRecord x, const DnsResourceRecord y);
6d99904f	369
d5099efc	370	extern const struct hash_ops dns_resource_key_hash_ops;
c9c72065	371	extern const struct hash_ops dns_resource_record_hash_ops;
8730bccf	372
8e54f5d9	373	int dnssec_algorithm_to_string_alloc(int i, char **ret);
8730bccf LP	374	int dnssec_algorithm_from_string(const char *s) _pure_;
8730bccf LP	375
8e54f5d9	376	int dnssec_digest_to_string_alloc(int i, char **ret);
8730bccf	377	int dnssec_digest_from_string(const char *s) _pure_;