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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
40 #if 0 /* keep Emacsens' auto-indent happy */
46 * Maximum size of a value that can be stored in a GNS block.
48 #define GNUNET_GNSRECORD_MAX_BLOCK_SIZE (63 * 1024)
52 * Record type indicating any record/'*'
54 #define GNUNET_GNSRECORD_TYPE_ANY 0
57 * Record type for GNS zone transfer ("PKEY").
59 #define GNUNET_GNSRECORD_TYPE_PKEY 65536
62 * Record type for GNS nick names ("NICK").
64 #define GNUNET_GNSRECORD_TYPE_NICK 65537
67 * Record type for GNS legacy hostnames ("LEHO").
69 #define GNUNET_GNSRECORD_TYPE_LEHO 65538
72 * Record type for VPN resolution
74 #define GNUNET_GNSRECORD_TYPE_VPN 65539
77 * Record type for delegation to DNS.
79 #define GNUNET_GNSRECORD_TYPE_GNS2DNS 65540
82 * Record type for a boxed record (see TLSA/SRV handling in GNS).
84 #define GNUNET_GNSRECORD_TYPE_BOX 65541
87 * Record type for a social place.
89 #define GNUNET_GNSRECORD_TYPE_PLACE 65542
92 * Record type for a phone (of CONVERSATION).
94 #define GNUNET_GNSRECORD_TYPE_PHONE 65543
97 * Record type for identity attributes (of IDENTITY).
99 #define GNUNET_GNSRECORD_TYPE_ID_ATTR 65544
102 * Record type for an identity token (of IDENTITY-TOKEN).
104 #define GNUNET_GNSRECORD_TYPE_ID_TOKEN 65545
107 * Record type for the private metadata of an identity token (of IDENTITY-TOKEN).
109 #define GNUNET_GNSRECORD_TYPE_ID_TOKEN_METADATA 65546
112 * Record type for credential
114 #define GNUNET_GNSRECORD_TYPE_CREDENTIAL 65547
117 * Record type for policies
119 #define GNUNET_GNSRECORD_TYPE_POLICY 65548
122 * Record type for reverse lookups
124 #define GNUNET_GNSRECORD_TYPE_ATTRIBUTE 65549
128 * Flags that can be set for a record.
130 enum GNUNET_GNSRECORD_Flags
134 * No special options.
136 GNUNET_GNSRECORD_RF_NONE = 0,
139 * This is a private record of this peer and it should
140 * thus not be handed out to other peers.
142 GNUNET_GNSRECORD_RF_PRIVATE = 2,
145 * This flag is currently unused; former RF_PENDING flag
147 * GNUNET_GNSRECORD_RF_UNUSED = 4,
151 * This expiration time of the record is a relative
152 * time (not an absolute time).
154 GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION = 8,
157 * This record should not be used unless all (other) records with an absolute
158 * expiration time have expired.
160 GNUNET_GNSRECORD_RF_SHADOW_RECORD = 16
163 * When comparing flags for record equality for removal,
164 * which flags should must match (in addition to the type,
165 * name, expiration value and data of the record)? All flags
166 * that are not listed here will be ignored for this purpose.
167 * (for example, we don't expect that users will remember to
168 * pass the '--private' option when removing a record from
169 * the namestore, hence we don't require this particular option
170 * to match upon removal). See also
171 * #GNUNET_GNSRECORD_records_cmp.
173 #define GNUNET_GNSRECORD_RF_RCMP_FLAGS (GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)
180 struct GNUNET_GNSRECORD_Data
184 * Binary value stored in the DNS record. Note: "data" must never
185 * be individually 'malloc'ed, but instead always points into some
186 * existing data area.
191 * Expiration time for the DNS record. Can be relative
192 * or absolute, depending on @e flags. Measured in the same
193 * unit as GNUnet time (microseconds).
195 uint64_t expiration_time;
198 * Number of bytes in @e data.
203 * Type of the GNS/DNS record.
205 uint32_t record_type;
208 * Flags for the record.
210 enum GNUNET_GNSRECORD_Flags flags;
214 GNUNET_NETWORK_STRUCT_BEGIN
217 * Data stored in a PLACE record.
219 struct GNUNET_GNSRECORD_PlaceData
222 * Public key of the place.
224 struct GNUNET_CRYPTO_EddsaPublicKey place_pub_key;
227 * Peer identity of the origin.
229 struct GNUNET_PeerIdentity origin;
232 * Number of relays that follow.
234 uint32_t relay_count GNUNET_PACKED;
236 /* Followed by struct GNUNET_PeerIdentity relays[relay_count] */
241 * Information we have in an encrypted block with record data (i.e. in the DHT).
243 struct GNUNET_GNSRECORD_Block
247 * Signature of the block.
249 struct GNUNET_CRYPTO_EcdsaSignature signature;
252 * Derived key used for signing; hash of this is the query.
254 struct GNUNET_CRYPTO_EcdsaPublicKey derived_key;
257 * Number of bytes signed; also specifies the number of bytes
258 * of encrypted data that follow.
260 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
263 * Expiration time of the block.
265 struct GNUNET_TIME_AbsoluteNBO expiration_time;
267 /* followed by encrypted data */
272 * Record type used to box up SRV and TLSA records. For example, a
273 * TLSA record for "_https._tcp.foo.gnu" will be stored under
274 * "foo.gnu" as a BOX record with service 443 (https) and protocol 6
275 * (tcp) and record_type "TLSA". When a BOX record is received, GNS
276 * unboxes it if the name contained "_SERVICE._PROTO", otherwise GNS
277 * leaves it untouched. This is done to ensure that TLSA (and SRV)
278 * records do not require a separate network request, thus making TLSA
279 * records inseparable from the "main" A/AAAA/VPN/etc. records.
281 struct GNUNET_GNSRECORD_BoxRecord
285 * Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
286 * Yes, in IP protocols are usually limited to 8 bits. In NBO.
288 uint16_t protocol GNUNET_PACKED;
291 * Service of the boxed record (aka port number), in NBO.
293 uint16_t service GNUNET_PACKED;
296 * GNS record type of the boxed record. In NBO.
298 uint32_t record_type GNUNET_PACKED;
300 /* followed by the 'original' record */
305 * Record type used internally to keep track of reverse mappings into a
307 * The record contains data related to PKEY delegations from other namespaces to
308 * the namespace the record belongs to.
309 * It is exclusively found under the label ``+''.
311 struct GNUNET_GNSRECORD_ReverseRecord
314 * The public key of the namespace the is delegating to our namespace
316 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
319 * The expiration time of the delegation
321 struct GNUNET_TIME_Absolute expiration;
323 /* followed by the name the delegator uses to refer to our namespace */
326 GNUNET_NETWORK_STRUCT_END
330 * Process a records that were decrypted from a block.
333 * @param rd_count number of entries in @a rd array
334 * @param rd array of records with data to store
336 typedef void (*GNUNET_GNSRECORD_RecordCallback) (void *cls,
337 unsigned int rd_count,
338 const struct GNUNET_GNSRECORD_Data *rd);
342 /* ***************** API related to GNSRECORD plugins ************** */
345 * Convert the binary value @a data of a record of
346 * type @a type to a human-readable string.
348 * @param type type of the record
349 * @param data value in binary encoding
350 * @param data_size number of bytes in @a data
351 * @return NULL on error, otherwise human-readable representation of the value
354 GNUNET_GNSRECORD_value_to_string (uint32_t type,
360 * Convert human-readable version of the value @a s of a record
361 * of type @a type to the respective binary representation.
363 * @param type type of the record
364 * @param s human-readable string
365 * @param data set to value in binary encoding (will be allocated)
366 * @param data_size set to number of bytes in @a data
367 * @return #GNUNET_OK on success
370 GNUNET_GNSRECORD_string_to_value (uint32_t type,
377 * Convert a type name (i.e. "AAAA") to the corresponding number.
379 * @param dns_typename name to convert
380 * @return corresponding number, UINT32_MAX on error
383 GNUNET_GNSRECORD_typename_to_number (const char *dns_typename);
387 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
389 * @param type number of a type to convert
390 * @return corresponding typestring, NULL on error
393 GNUNET_GNSRECORD_number_to_typename (uint32_t type);
396 /* convenience APIs for serializing / deserializing GNS records */
399 * Calculate how many bytes we will need to serialize the given
402 * @param rd_count number of records in the @a rd array
403 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
404 * @return the required size to serialize
407 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
408 const struct GNUNET_GNSRECORD_Data *rd);
412 * Serialize the given records to the given destination buffer.
414 * @param rd_count number of records in the @a rd array
415 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
416 * @param dest_size size of the destination array @a dst
417 * @param dest where to write the result
418 * @return the size of serialized records, -1 if records do not fit
421 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
422 const struct GNUNET_GNSRECORD_Data *rd,
428 * Deserialize the given records to the given destination.
430 * @param len size of the serialized record data
431 * @param src the serialized record data
432 * @param rd_count number of records in the @a dest array
433 * @param dest where to put the data
434 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
437 GNUNET_GNSRECORD_records_deserialize (size_t len,
439 unsigned int rd_count,
440 struct GNUNET_GNSRECORD_Data *dest);
443 /* ******* general APIs relating to blocks, records and labels ******** */
448 * Test if a given record is expired.
450 * @param rd record to test
451 * @return #GNUNET_YES if the record is expired,
455 GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd);
459 * Convert a UTF-8 string to UTF-8 lowercase
460 * @param src source string
461 * @return converted result
464 GNUNET_GNSRECORD_string_to_lowercase (const char *src);
468 * Convert a zone to a string (for printing debug messages).
469 * This is one of the very few calls in the entire API that is
472 * @param z public key of a zone
473 * @return string form; will be overwritten by next call to #GNUNET_GNSRECORD_z2s.
476 GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z);
480 * Convert public key to the respective absolute domain name in the
482 * This is one of the very few calls in the entire API that is
485 * @param pkey a public key with a point on the eliptic curve
486 * @return string "X.zkey" where X is the coordinates of the public
487 * key in an encoding suitable for DNS labels.
490 GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
494 * Convert an absolute domain name in the ".zkey" pTLD to the
495 * respective public key.
497 * @param zkey string "X.zkey" where X is the public
498 * key in an encoding suitable for DNS labels.
499 * @param pkey set to a public key on the eliptic curve
500 * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
503 GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
504 struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
508 * Calculate the DHT query for a given @a label in a given @a zone.
510 * @param zone private key of the zone
511 * @param label label of the record
512 * @param query hash to use for the query
515 GNUNET_GNSRECORD_query_from_private_key (const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
517 struct GNUNET_HashCode *query);
521 * Calculate the DHT query for a given @a label in a given @a zone.
523 * @param pub public key of the zone
524 * @param label label of the record
525 * @param query hash to use for the query
528 GNUNET_GNSRECORD_query_from_public_key (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
530 struct GNUNET_HashCode *query);
534 * Sign name and records
536 * @param key the private key
537 * @param expire block expiration
538 * @param label the name for the records
539 * @param rd record data
540 * @param rd_count number of records in @a rd
542 struct GNUNET_GNSRECORD_Block *
543 GNUNET_GNSRECORD_block_create (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
544 struct GNUNET_TIME_Absolute expire,
546 const struct GNUNET_GNSRECORD_Data *rd,
547 unsigned int rd_count);
551 * Check if a signature is valid. This API is used by the GNS Block
552 * to validate signatures received from the network.
554 * @param block block to verify
555 * @return #GNUNET_OK if the signature is valid
558 GNUNET_GNSRECORD_block_verify (const struct GNUNET_GNSRECORD_Block *block);
564 * @param block block to decrypt
565 * @param zone_key public key of the zone
566 * @param label the name for the records
567 * @param proc function to call with the result
568 * @param proc_cls closure for @a proc
569 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block was
573 GNUNET_GNSRECORD_block_decrypt (const struct GNUNET_GNSRECORD_Block *block,
574 const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
576 GNUNET_GNSRECORD_RecordCallback proc,
581 * Compares if two records are equal
584 * @param b another record
585 * @return #GNUNET_YES if the records are equal, or #GNUNET_NO if not.
588 GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
589 const struct GNUNET_GNSRECORD_Data *b);
593 * Returns the expiration time of the given block of records. The block
594 * expiration time is the expiration time of the record with smallest
597 * @param rd_count number of records given in @a rd
598 * @param rd array of records
599 * @return absolute expiration time
601 struct GNUNET_TIME_Absolute
602 GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
603 const struct GNUNET_GNSRECORD_Data *rd);
606 #if 0 /* keep Emacsens' auto-indent happy */
615 /** @} */ /* end of group */