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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
127 * Record type for ABE records
129 #define GNUNET_GNSRECORD_TYPE_ABE_KEY 65550
132 * Record type for ABE master keys
134 #define GNUNET_GNSRECORD_TYPE_ABE_MASTER 65551
137 * Flags that can be set for a record.
139 enum GNUNET_GNSRECORD_Flags
143 * No special options.
145 GNUNET_GNSRECORD_RF_NONE = 0,
148 * This is a private record of this peer and it should
149 * thus not be handed out to other peers.
151 GNUNET_GNSRECORD_RF_PRIVATE = 2,
154 * This flag is currently unused; former RF_PENDING flag
156 * GNUNET_GNSRECORD_RF_UNUSED = 4,
160 * This expiration time of the record is a relative
161 * time (not an absolute time).
163 GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION = 8,
166 * This record should not be used unless all (other) records with an absolute
167 * expiration time have expired.
169 GNUNET_GNSRECORD_RF_SHADOW_RECORD = 16
172 * When comparing flags for record equality for removal,
173 * which flags should must match (in addition to the type,
174 * name, expiration value and data of the record)? All flags
175 * that are not listed here will be ignored for this purpose.
176 * (for example, we don't expect that users will remember to
177 * pass the '--private' option when removing a record from
178 * the namestore, hence we don't require this particular option
179 * to match upon removal). See also
180 * #GNUNET_GNSRECORD_records_cmp.
182 #define GNUNET_GNSRECORD_RF_RCMP_FLAGS (GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)
189 struct GNUNET_GNSRECORD_Data
193 * Binary value stored in the DNS record. Note: "data" must never
194 * be individually 'malloc'ed, but instead always points into some
195 * existing data area.
200 * Expiration time for the DNS record. Can be relative
201 * or absolute, depending on @e flags. Measured in the same
202 * unit as GNUnet time (microseconds).
204 uint64_t expiration_time;
207 * Number of bytes in @e data.
212 * Type of the GNS/DNS record.
214 uint32_t record_type;
217 * Flags for the record.
219 enum GNUNET_GNSRECORD_Flags flags;
223 GNUNET_NETWORK_STRUCT_BEGIN
226 * Data stored in a PLACE record.
228 struct GNUNET_GNSRECORD_PlaceData
231 * Public key of the place.
233 struct GNUNET_CRYPTO_EddsaPublicKey place_pub_key;
236 * Peer identity of the origin.
238 struct GNUNET_PeerIdentity origin;
241 * Number of relays that follow.
243 uint32_t relay_count GNUNET_PACKED;
245 /* Followed by struct GNUNET_PeerIdentity relays[relay_count] */
250 * Information we have in an encrypted block with record data (i.e. in the DHT).
252 struct GNUNET_GNSRECORD_Block
256 * Signature of the block.
258 struct GNUNET_CRYPTO_EcdsaSignature signature;
261 * Derived key used for signing; hash of this is the query.
263 struct GNUNET_CRYPTO_EcdsaPublicKey derived_key;
266 * Number of bytes signed; also specifies the number of bytes
267 * of encrypted data that follow.
269 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
272 * Expiration time of the block.
274 struct GNUNET_TIME_AbsoluteNBO expiration_time;
276 /* followed by encrypted data */
281 * Record type used to box up SRV and TLSA records. For example, a
282 * TLSA record for "_https._tcp.foo.gnu" will be stored under
283 * "foo.gnu" as a BOX record with service 443 (https) and protocol 6
284 * (tcp) and record_type "TLSA". When a BOX record is received, GNS
285 * unboxes it if the name contained "_SERVICE._PROTO", otherwise GNS
286 * leaves it untouched. This is done to ensure that TLSA (and SRV)
287 * records do not require a separate network request, thus making TLSA
288 * records inseparable from the "main" A/AAAA/VPN/etc. records.
290 struct GNUNET_GNSRECORD_BoxRecord
294 * Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
295 * Yes, in IP protocols are usually limited to 8 bits. In NBO.
297 uint16_t protocol GNUNET_PACKED;
300 * Service of the boxed record (aka port number), in NBO.
302 uint16_t service GNUNET_PACKED;
305 * GNS record type of the boxed record. In NBO.
307 uint32_t record_type GNUNET_PACKED;
309 /* followed by the 'original' record */
314 * Record type used internally to keep track of reverse mappings into a
316 * The record contains data related to PKEY delegations from other namespaces to
317 * the namespace the record belongs to.
318 * It is exclusively found under the label ``+''.
320 struct GNUNET_GNSRECORD_ReverseRecord
323 * The public key of the namespace the is delegating to our namespace
325 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
328 * The expiration time of the delegation
330 struct GNUNET_TIME_Absolute expiration;
332 /* followed by the name the delegator uses to refer to our namespace */
335 GNUNET_NETWORK_STRUCT_END
339 * Process a records that were decrypted from a block.
342 * @param rd_count number of entries in @a rd array
343 * @param rd array of records with data to store
346 (*GNUNET_GNSRECORD_RecordCallback) (void *cls,
347 unsigned int rd_count,
348 const struct GNUNET_GNSRECORD_Data *rd);
352 /* ***************** API related to GNSRECORD plugins ************** */
355 * Convert the binary value @a data of a record of
356 * type @a type to a human-readable string.
358 * @param type type of the record
359 * @param data value in binary encoding
360 * @param data_size number of bytes in @a data
361 * @return NULL on error, otherwise human-readable representation of the value
364 GNUNET_GNSRECORD_value_to_string (uint32_t type,
370 * Convert human-readable version of the value @a s of a record
371 * of type @a type to the respective binary representation.
373 * @param type type of the record
374 * @param s human-readable string
375 * @param data set to value in binary encoding (will be allocated)
376 * @param data_size set to number of bytes in @a data
377 * @return #GNUNET_OK on success
380 GNUNET_GNSRECORD_string_to_value (uint32_t type,
387 * Convert a type name (i.e. "AAAA") to the corresponding number.
389 * @param dns_typename name to convert
390 * @return corresponding number, UINT32_MAX on error
393 GNUNET_GNSRECORD_typename_to_number (const char *dns_typename);
397 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
399 * @param type number of a type to convert
400 * @return corresponding typestring, NULL on error
403 GNUNET_GNSRECORD_number_to_typename (uint32_t type);
406 /* convenience APIs for serializing / deserializing GNS records */
409 * Calculate how many bytes we will need to serialize the given
412 * @param rd_count number of records in the @a rd array
413 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
414 * @return the required size to serialize
417 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
418 const struct GNUNET_GNSRECORD_Data *rd);
422 * Serialize the given records to the given destination buffer.
424 * @param rd_count number of records in the @a rd array
425 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
426 * @param dest_size size of the destination array @a dst
427 * @param dest where to write the result
428 * @return the size of serialized records, -1 if records do not fit
431 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
432 const struct GNUNET_GNSRECORD_Data *rd,
438 * Deserialize the given records to the given destination.
440 * @param len size of the serialized record data
441 * @param src the serialized record data
442 * @param rd_count number of records in the @a dest array
443 * @param dest where to put the data
444 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
447 GNUNET_GNSRECORD_records_deserialize (size_t len,
449 unsigned int rd_count,
450 struct GNUNET_GNSRECORD_Data *dest);
453 /* ******* general APIs relating to blocks, records and labels ******** */
458 * Test if a given record is expired.
460 * @param rd record to test
461 * @return #GNUNET_YES if the record is expired,
465 GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd);
469 * Convert a UTF-8 string to UTF-8 lowercase
470 * @param src source string
471 * @return converted result
474 GNUNET_GNSRECORD_string_to_lowercase (const char *src);
478 * Convert a zone to a string (for printing debug messages).
479 * This is one of the very few calls in the entire API that is
482 * @param z public key of a zone
483 * @return string form; will be overwritten by next call to #GNUNET_GNSRECORD_z2s.
486 GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z);
490 * Convert public key to the respective absolute domain name in the
492 * This is one of the very few calls in the entire API that is
495 * @param pkey a public key with a point on the eliptic curve
496 * @return string "X.zkey" where X is the coordinates of the public
497 * key in an encoding suitable for DNS labels.
500 GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
504 * Convert an absolute domain name in the ".zkey" pTLD to the
505 * respective public key.
507 * @param zkey string "X.zkey" where X is the public
508 * key in an encoding suitable for DNS labels.
509 * @param pkey set to a public key on the eliptic curve
510 * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
513 GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
514 struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
518 * Calculate the DHT query for a given @a label in a given @a zone.
520 * @param zone private key of the zone
521 * @param label label of the record
522 * @param query hash to use for the query
525 GNUNET_GNSRECORD_query_from_private_key (const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
527 struct GNUNET_HashCode *query);
531 * Calculate the DHT query for a given @a label in a given @a zone.
533 * @param pub public key of the zone
534 * @param label label of the record
535 * @param query hash to use for the query
538 GNUNET_GNSRECORD_query_from_public_key (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
540 struct GNUNET_HashCode *query);
544 * Sign name and records
546 * @param key the private key
547 * @param expire block expiration
548 * @param label the name for the records
549 * @param rd record data
550 * @param rd_count number of records in @a rd
552 struct GNUNET_GNSRECORD_Block *
553 GNUNET_GNSRECORD_block_create (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
554 struct GNUNET_TIME_Absolute expire,
556 const struct GNUNET_GNSRECORD_Data *rd,
557 unsigned int rd_count);
561 * Check if a signature is valid. This API is used by the GNS Block
562 * to validate signatures received from the network.
564 * @param block block to verify
565 * @return #GNUNET_OK if the signature is valid
568 GNUNET_GNSRECORD_block_verify (const struct GNUNET_GNSRECORD_Block *block);
574 * @param block block to decrypt
575 * @param zone_key public key of the zone
576 * @param label the name for the records
577 * @param proc function to call with the result
578 * @param proc_cls closure for @a proc
579 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block was
583 GNUNET_GNSRECORD_block_decrypt (const struct GNUNET_GNSRECORD_Block *block,
584 const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
586 GNUNET_GNSRECORD_RecordCallback proc,
591 * Compares if two records are equal
594 * @param b another record
595 * @return #GNUNET_YES if the records are equal, or #GNUNET_NO if not.
598 GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
599 const struct GNUNET_GNSRECORD_Data *b);
603 * Returns the expiration time of the given block of records. The block
604 * expiration time is the expiration time of the record with smallest
607 * @param rd_count number of records given in @a rd
608 * @param rd array of records
609 * @return absolute expiration time
611 struct GNUNET_TIME_Absolute
612 GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
613 const struct GNUNET_GNSRECORD_Data *rd);
616 #if 0 /* keep Emacsens' auto-indent happy */
625 /** @} */ /* end of group */