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-rw-r--r--src/resolve/resolved-dns-rr.h341
1 files changed, 341 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
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+++ b/src/resolve/resolved-dns-rr.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <netinet/in.h>
+
+#include "bitmap.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 (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 = (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 */
+
+ /* How many labels to strip to determine "signer" of the RRSIG (aka, the zone). -1 if not signed. */
+ unsigned 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. */
+ unsigned n_skip_labels_source;
+
+ bool unparsable: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 data_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;
+
+ /* https://tools.ietf.org/html/draft-ietf-dane-protocol-23 */
+ struct {
+ uint8_t cert_usage;
+ uint8_t selector;
+ uint8_t matching_type;
+ void *data;
+ size_t data_size;
+ } tlsa;
+
+ /* https://tools.ietf.org/html/rfc6844 */
+ struct {
+ uint8_t flags;
+ char *tag;
+ void *value;
+ size_t value_size;
+ } caa;
+ };
+};
+
+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);
+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);
+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);
+
+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);
+
+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_;
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