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18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @author Christian Grothoff
25 * API that can be used to manipulate GNS record data
27 * @defgroup gnsrecord GNS Record library
28 * Manipulate GNS record data
30 * @see [Documentation](https://gnunet.org/gns-plugins)
34 #ifndef GNUNET_GNSRECORD_LIB_H
35 #define GNUNET_GNSRECORD_LIB_H
39 #if 0 /* keep Emacsens' auto-indent happy */
45 * Maximum size of a value that can be stored in a GNS block.
47 #define GNUNET_GNSRECORD_MAX_BLOCK_SIZE (63 * 1024)
51 * Record type indicating any record/'*'
53 #define GNUNET_GNSRECORD_TYPE_ANY 0
56 * Record type for GNS zone transfer ("PKEY").
58 #define GNUNET_GNSRECORD_TYPE_PKEY 65536
61 * Record type for GNS nick names ("NICK").
63 #define GNUNET_GNSRECORD_TYPE_NICK 65537
66 * Record type for GNS legacy hostnames ("LEHO").
68 #define GNUNET_GNSRECORD_TYPE_LEHO 65538
71 * Record type for VPN resolution
73 #define GNUNET_GNSRECORD_TYPE_VPN 65539
76 * Record type for delegation to DNS.
78 #define GNUNET_GNSRECORD_TYPE_GNS2DNS 65540
81 * Record type for a boxed record (see TLSA/SRV handling in GNS).
83 #define GNUNET_GNSRECORD_TYPE_BOX 65541
86 * Record type for a social place.
88 #define GNUNET_GNSRECORD_TYPE_PLACE 65542
91 * Record type for a phone (of CONVERSATION).
93 #define GNUNET_GNSRECORD_TYPE_PHONE 65543
96 * Record type for identity attributes (of RECLAIM).
98 #define GNUNET_GNSRECORD_TYPE_RECLAIM_ATTR 65544
101 * Record type for local ticket references
103 #define GNUNET_GNSRECORD_TYPE_RECLAIM_TICKET 65545
110 * 65547 deleted, free to use
114 * Record type for policies
116 #define GNUNET_GNSRECORD_TYPE_DELEGATE 65548
119 * Record type for reverse lookups
121 #define GNUNET_GNSRECORD_TYPE_ATTRIBUTE 65549
124 * Record type for reclaim records
126 #define GNUNET_GNSRECORD_TYPE_RECLAIM_ATTR_REF 65550
129 * Record type for RECLAIM master
131 #define GNUNET_GNSRECORD_TYPE_RECLAIM_MASTER 65551
134 * Record type for reclaim OIDC clients
136 #define GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_CLIENT 65552
139 * Record type for reclaim OIDC redirect URIs
141 #define GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT 65553
144 * Flags that can be set for a record.
146 enum GNUNET_GNSRECORD_Flags
149 * No special options.
151 GNUNET_GNSRECORD_RF_NONE = 0,
154 * This is a private record of this peer and it should
155 * thus not be handed out to other peers.
157 GNUNET_GNSRECORD_RF_PRIVATE = 2,
160 * This flag is currently unused; former RF_PENDING flag
162 * GNUNET_GNSRECORD_RF_UNUSED = 4,
166 * This expiration time of the record is a relative
167 * time (not an absolute time).
169 GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION = 8,
172 * This record should not be used unless all (other) records with an absolute
173 * expiration time have expired.
175 GNUNET_GNSRECORD_RF_SHADOW_RECORD = 16
178 * When comparing flags for record equality for removal,
179 * which flags should must match (in addition to the type,
180 * name, expiration value and data of the record)? All flags
181 * that are not listed here will be ignored for this purpose.
182 * (for example, we don't expect that users will remember to
183 * pass the '--private' option when removing a record from
184 * the namestore, hence we don't require this particular option
185 * to match upon removal). See also
186 * #GNUNET_GNSRECORD_records_cmp.
188 #define GNUNET_GNSRECORD_RF_RCMP_FLAGS (GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)
195 struct GNUNET_GNSRECORD_Data
198 * Binary value stored in the DNS record. Note: "data" must never
199 * be individually 'malloc'ed, but instead always points into some
200 * existing data area.
205 * Expiration time for the DNS record. Can be relative
206 * or absolute, depending on @e flags. Measured in the same
207 * unit as GNUnet time (microseconds).
209 uint64_t expiration_time;
212 * Number of bytes in @e data.
217 * Type of the GNS/DNS record.
219 uint32_t record_type;
222 * Flags for the record.
224 enum GNUNET_GNSRECORD_Flags flags;
228 GNUNET_NETWORK_STRUCT_BEGIN
231 * Data stored in a PLACE record.
233 struct GNUNET_GNSRECORD_PlaceData
236 * Public key of the place.
238 struct GNUNET_CRYPTO_EddsaPublicKey place_pub_key;
241 * Peer identity of the origin.
243 struct GNUNET_PeerIdentity origin;
246 * Number of relays that follow.
248 uint32_t relay_count GNUNET_PACKED;
250 /* Followed by struct GNUNET_PeerIdentity relays[relay_count] */
255 * Information we have in an encrypted block with record data (i.e. in the DHT).
257 struct GNUNET_GNSRECORD_Block
260 * Signature of the block.
262 struct GNUNET_CRYPTO_EcdsaSignature signature;
265 * Derived key used for signing; hash of this is the query.
267 struct GNUNET_CRYPTO_EcdsaPublicKey derived_key;
270 * Number of bytes signed; also specifies the number of bytes
271 * of encrypted data that follow.
273 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
276 * Expiration time of the block.
278 struct GNUNET_TIME_AbsoluteNBO expiration_time;
280 /* followed by encrypted data */
285 * Record type used to box up SRV and TLSA records. For example, a
286 * TLSA record for "_https._tcp.foo.gnu" will be stored under
287 * "foo.gnu" as a BOX record with service 443 (https) and protocol 6
288 * (tcp) and record_type "TLSA". When a BOX record is received, GNS
289 * unboxes it if the name contained "_SERVICE._PROTO", otherwise GNS
290 * leaves it untouched. This is done to ensure that TLSA (and SRV)
291 * records do not require a separate network request, thus making TLSA
292 * records inseparable from the "main" A/AAAA/VPN/etc. records.
294 struct GNUNET_GNSRECORD_BoxRecord
297 * Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
298 * Yes, in IP protocols are usually limited to 8 bits. In NBO.
300 uint16_t protocol GNUNET_PACKED;
303 * Service of the boxed record (aka port number), in NBO.
305 uint16_t service GNUNET_PACKED;
308 * GNS record type of the boxed record. In NBO.
310 uint32_t record_type GNUNET_PACKED;
312 /* followed by the 'original' record */
316 * Record type used internally to keep track of reverse mappings into a
318 * The record contains data related to PKEY delegations from other namespaces to
319 * the namespace the record belongs to.
320 * It is exclusively found under the label ``+''.
322 struct GNUNET_GNSRECORD_ReverseRecord
325 * The public key of the namespace the is delegating to our namespace
327 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
330 * The expiration time of the delegation
332 struct GNUNET_TIME_Absolute expiration;
334 /* followed by the name the delegator uses to refer to our namespace */
337 GNUNET_NETWORK_STRUCT_END
341 * Process a records that were decrypted from a block.
344 * @param rd_count number of entries in @a rd array
345 * @param rd array of records with data to store
347 typedef void (*GNUNET_GNSRECORD_RecordCallback) (
348 void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd);
351 /* ***************** API related to GNSRECORD plugins ************** */
354 * Convert the binary value @a data of a record of
355 * type @a type to a human-readable string.
357 * @param type type of the record
358 * @param data value in binary encoding
359 * @param data_size number of bytes in @a data
360 * @return NULL on error, otherwise human-readable representation of the value
363 GNUNET_GNSRECORD_value_to_string (uint32_t type, const void *data,
368 * Convert human-readable version of the value @a s of a record
369 * of type @a type to the respective binary representation.
371 * @param type type of the record
372 * @param s human-readable string
373 * @param data set to value in binary encoding (will be allocated)
374 * @param data_size set to number of bytes in @a data
375 * @return #GNUNET_OK on success
378 GNUNET_GNSRECORD_string_to_value (uint32_t type, const char *s, void **data,
383 * Convert a type name (i.e. "AAAA") to the corresponding number.
385 * @param dns_typename name to convert
386 * @return corresponding number, UINT32_MAX on error
389 GNUNET_GNSRECORD_typename_to_number (const char *dns_typename);
393 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
395 * @param type number of a type to convert
396 * @return corresponding typestring, NULL on error
399 GNUNET_GNSRECORD_number_to_typename (uint32_t type);
402 /* convenience APIs for serializing / deserializing GNS records */
405 * Calculate how many bytes we will need to serialize the given
408 * @param rd_count number of records in the @a rd array
409 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
410 * @return the required size to serialize, -1 on error
413 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
414 const struct GNUNET_GNSRECORD_Data *rd);
418 * Serialize the given records to the given destination buffer.
420 * @param rd_count number of records in the @a rd array
421 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
422 * @param dest_size size of the destination array @a dst
423 * @param dest where to write the result
424 * @return the size of serialized records, -1 if records do not fit
427 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
428 const struct GNUNET_GNSRECORD_Data *rd,
429 size_t dest_size, char *dest);
433 * Deserialize the given records to the given destination.
435 * @param len size of the serialized record data
436 * @param src the serialized record data
437 * @param rd_count number of records in the @a dest array
438 * @param dest where to put the data
439 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
442 GNUNET_GNSRECORD_records_deserialize (size_t len, const char *src,
443 unsigned int rd_count,
444 struct GNUNET_GNSRECORD_Data *dest);
447 /* ******* general APIs relating to blocks, records and labels ******** */
451 * Test if a given record is expired.
453 * @param rd record to test
454 * @return #GNUNET_YES if the record is expired,
458 GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd);
462 * Convert a UTF-8 string to UTF-8 lowercase
463 * @param src source string
464 * @return converted result
467 GNUNET_GNSRECORD_string_to_lowercase (const char *src);
471 * Convert a zone to a string (for printing debug messages).
472 * This is one of the very few calls in the entire API that is
475 * @param z public key of a zone
476 * @return string form; will be overwritten by next call to
477 * #GNUNET_GNSRECORD_z2s.
480 GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z);
484 * Convert public key to the respective absolute domain name in the
486 * This is one of the very few calls in the entire API that is
489 * @param pkey a public key with a point on the eliptic curve
490 * @return string "X.zkey" where X is the coordinates of the public
491 * key in an encoding suitable for DNS labels.
494 GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
498 * Convert an absolute domain name to the
499 * respective public key.
501 * @param zkey string "X" where X is the public
502 * key in an encoding suitable for DNS labels.
503 * @param pkey set to a public key on the eliptic curve
504 * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
507 GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
508 struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
512 * Calculate the DHT query for a given @a label in a given @a zone.
514 * @param zone private key of the zone
515 * @param label label of the record
516 * @param query hash to use for the query
519 GNUNET_GNSRECORD_query_from_private_key (
520 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone, const char *label,
521 struct GNUNET_HashCode *query);
525 * Calculate the DHT query for a given @a label in a given @a zone.
527 * @param pub public key of the zone
528 * @param label label of the record
529 * @param query hash to use for the query
532 GNUNET_GNSRECORD_query_from_public_key (
533 const struct GNUNET_CRYPTO_EcdsaPublicKey *pub, const char *label,
534 struct GNUNET_HashCode *query);
538 * Sign name and records
540 * @param key the private key
541 * @param expire block expiration
542 * @param label the name for the records
543 * @param rd record data
544 * @param rd_count number of records in @a rd
546 struct GNUNET_GNSRECORD_Block *
547 GNUNET_GNSRECORD_block_create (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
548 struct GNUNET_TIME_Absolute expire,
550 const struct GNUNET_GNSRECORD_Data *rd,
551 unsigned int rd_count);
555 * Sign name and records, cache derived public key (also keeps the
556 * private key in static memory, so do not use this function if
557 * keeping the private key in the process'es RAM is a major issue).
559 * @param key the private key
560 * @param expire block expiration
561 * @param label the name for the records
562 * @param rd record data
563 * @param rd_count number of records in @a rd
565 struct GNUNET_GNSRECORD_Block *
566 GNUNET_GNSRECORD_block_create2 (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
567 struct GNUNET_TIME_Absolute expire,
569 const struct GNUNET_GNSRECORD_Data *rd,
570 unsigned int rd_count);
574 * Check if a signature is valid. This API is used by the GNS Block
575 * to validate signatures received from the network.
577 * @param block block to verify
578 * @return #GNUNET_OK if the signature is valid
581 GNUNET_GNSRECORD_block_verify (const struct GNUNET_GNSRECORD_Block *block);
587 * @param block block to decrypt
588 * @param zone_key public key of the zone
589 * @param label the name for the records
590 * @param proc function to call with the result
591 * @param proc_cls closure for @a proc
592 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block was
596 GNUNET_GNSRECORD_block_decrypt (
597 const struct GNUNET_GNSRECORD_Block *block,
598 const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key, const char *label,
599 GNUNET_GNSRECORD_RecordCallback proc, void *proc_cls);
603 * Compares if two records are equal
606 * @param b another record
607 * @return #GNUNET_YES if the records are equal, or #GNUNET_NO if not.
610 GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
611 const struct GNUNET_GNSRECORD_Data *b);
615 * Returns the expiration time of the given block of records. The block
616 * expiration time is the expiration time of the record with smallest
619 * @param rd_count number of records given in @a rd
620 * @param rd array of records
621 * @return absolute expiration time
623 struct GNUNET_TIME_Absolute
624 GNUNET_GNSRECORD_record_get_expiration_time (
625 unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd);
628 #if 0 /* keep Emacsens' auto-indent happy */
637 /** @} */ /* end of group */