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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 * Flags that can be set for a record.
134 enum GNUNET_GNSRECORD_Flags
138 * No special options.
140 GNUNET_GNSRECORD_RF_NONE = 0,
143 * This is a private record of this peer and it should
144 * thus not be handed out to other peers.
146 GNUNET_GNSRECORD_RF_PRIVATE = 2,
149 * This flag is currently unused; former RF_PENDING flag
151 * GNUNET_GNSRECORD_RF_UNUSED = 4,
155 * This expiration time of the record is a relative
156 * time (not an absolute time).
158 GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION = 8,
161 * This record should not be used unless all (other) records with an absolute
162 * expiration time have expired.
164 GNUNET_GNSRECORD_RF_SHADOW_RECORD = 16
167 * When comparing flags for record equality for removal,
168 * which flags should must match (in addition to the type,
169 * name, expiration value and data of the record)? All flags
170 * that are not listed here will be ignored for this purpose.
171 * (for example, we don't expect that users will remember to
172 * pass the '--private' option when removing a record from
173 * the namestore, hence we don't require this particular option
174 * to match upon removal). See also
175 * #GNUNET_GNSRECORD_records_cmp.
177 #define GNUNET_GNSRECORD_RF_RCMP_FLAGS (GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)
184 struct GNUNET_GNSRECORD_Data
188 * Binary value stored in the DNS record. Note: "data" must never
189 * be individually 'malloc'ed, but instead always points into some
190 * existing data area.
195 * Expiration time for the DNS record. Can be relative
196 * or absolute, depending on @e flags. Measured in the same
197 * unit as GNUnet time (microseconds).
199 uint64_t expiration_time;
202 * Number of bytes in @e data.
207 * Type of the GNS/DNS record.
209 uint32_t record_type;
212 * Flags for the record.
214 enum GNUNET_GNSRECORD_Flags flags;
218 GNUNET_NETWORK_STRUCT_BEGIN
221 * Data stored in a PLACE record.
223 struct GNUNET_GNSRECORD_PlaceData
226 * Public key of the place.
228 struct GNUNET_CRYPTO_EddsaPublicKey place_pub_key;
231 * Peer identity of the origin.
233 struct GNUNET_PeerIdentity origin;
236 * Number of relays that follow.
238 uint32_t relay_count GNUNET_PACKED;
240 /* Followed by struct GNUNET_PeerIdentity relays[relay_count] */
245 * Information we have in an encrypted block with record data (i.e. in the DHT).
247 struct GNUNET_GNSRECORD_Block
251 * Signature of the block.
253 struct GNUNET_CRYPTO_EcdsaSignature signature;
256 * Derived key used for signing; hash of this is the query.
258 struct GNUNET_CRYPTO_EcdsaPublicKey derived_key;
261 * Number of bytes signed; also specifies the number of bytes
262 * of encrypted data that follow.
264 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
267 * Expiration time of the block.
269 struct GNUNET_TIME_AbsoluteNBO expiration_time;
271 /* followed by encrypted data */
276 * Record type used to box up SRV and TLSA records. For example, a
277 * TLSA record for "_https._tcp.foo.gnu" will be stored under
278 * "foo.gnu" as a BOX record with service 443 (https) and protocol 6
279 * (tcp) and record_type "TLSA". When a BOX record is received, GNS
280 * unboxes it if the name contained "_SERVICE._PROTO", otherwise GNS
281 * leaves it untouched. This is done to ensure that TLSA (and SRV)
282 * records do not require a separate network request, thus making TLSA
283 * records inseparable from the "main" A/AAAA/VPN/etc. records.
285 struct GNUNET_GNSRECORD_BoxRecord
289 * Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
290 * Yes, in IP protocols are usually limited to 8 bits. In NBO.
292 uint16_t protocol GNUNET_PACKED;
295 * Service of the boxed record (aka port number), in NBO.
297 uint16_t service GNUNET_PACKED;
300 * GNS record type of the boxed record. In NBO.
302 uint32_t record_type GNUNET_PACKED;
304 /* followed by the 'original' record */
309 * Record type used internally to keep track of reverse mappings into a
311 * The record contains data related to PKEY delegations from other namespaces to
312 * the namespace the record belongs to.
313 * It is exclusively found under the label ``+''.
315 struct GNUNET_GNSRECORD_ReverseRecord
318 * The public key of the namespace the is delegating to our namespace
320 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
323 * The expiration time of the delegation
325 struct GNUNET_TIME_Absolute expiration;
327 /* followed by the name the delegator uses to refer to our namespace */
330 GNUNET_NETWORK_STRUCT_END
334 * Process a records that were decrypted from a block.
337 * @param rd_count number of entries in @a rd array
338 * @param rd array of records with data to store
340 typedef void (*GNUNET_GNSRECORD_RecordCallback) (void *cls,
341 unsigned int rd_count,
342 const struct GNUNET_GNSRECORD_Data *rd);
346 /* ***************** API related to GNSRECORD plugins ************** */
349 * Convert the binary value @a data of a record of
350 * type @a type to a human-readable string.
352 * @param type type of the record
353 * @param data value in binary encoding
354 * @param data_size number of bytes in @a data
355 * @return NULL on error, otherwise human-readable representation of the value
358 GNUNET_GNSRECORD_value_to_string (uint32_t type,
364 * Convert human-readable version of the value @a s of a record
365 * of type @a type to the respective binary representation.
367 * @param type type of the record
368 * @param s human-readable string
369 * @param data set to value in binary encoding (will be allocated)
370 * @param data_size set to number of bytes in @a data
371 * @return #GNUNET_OK on success
374 GNUNET_GNSRECORD_string_to_value (uint32_t type,
381 * Convert a type name (i.e. "AAAA") to the corresponding number.
383 * @param dns_typename name to convert
384 * @return corresponding number, UINT32_MAX on error
387 GNUNET_GNSRECORD_typename_to_number (const char *dns_typename);
391 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
393 * @param type number of a type to convert
394 * @return corresponding typestring, NULL on error
397 GNUNET_GNSRECORD_number_to_typename (uint32_t type);
400 /* convenience APIs for serializing / deserializing GNS records */
403 * Calculate how many bytes we will need to serialize the given
406 * @param rd_count number of records in the @a rd array
407 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
408 * @return the required size to serialize
411 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
412 const struct GNUNET_GNSRECORD_Data *rd);
416 * Serialize the given records to the given destination buffer.
418 * @param rd_count number of records in the @a rd array
419 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
420 * @param dest_size size of the destination array @a dst
421 * @param dest where to write the result
422 * @return the size of serialized records, -1 if records do not fit
425 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
426 const struct GNUNET_GNSRECORD_Data *rd,
432 * Deserialize the given records to the given destination.
434 * @param len size of the serialized record data
435 * @param src the serialized record data
436 * @param rd_count number of records in the @a dest array
437 * @param dest where to put the data
438 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
441 GNUNET_GNSRECORD_records_deserialize (size_t len,
443 unsigned int rd_count,
444 struct GNUNET_GNSRECORD_Data *dest);
447 /* ******* general APIs relating to blocks, records and labels ******** */
452 * Test if a given record is expired.
454 * @param rd record to test
455 * @return #GNUNET_YES if the record is expired,
459 GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd);
463 * Convert a UTF-8 string to UTF-8 lowercase
464 * @param src source string
465 * @return converted result
468 GNUNET_GNSRECORD_string_to_lowercase (const char *src);
472 * Convert a zone to a string (for printing debug messages).
473 * This is one of the very few calls in the entire API that is
476 * @param z public key of a zone
477 * @return string form; will be overwritten by next call to #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 in the ".zkey" pTLD to the
499 * respective public key.
501 * @param zkey string "X.zkey" 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 (const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
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 (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
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 * Check if a signature is valid. This API is used by the GNS Block
556 * to validate signatures received from the network.
558 * @param block block to verify
559 * @return #GNUNET_OK if the signature is valid
562 GNUNET_GNSRECORD_block_verify (const struct GNUNET_GNSRECORD_Block *block);
568 * @param block block to decrypt
569 * @param zone_key public key of the zone
570 * @param label the name for the records
571 * @param proc function to call with the result
572 * @param proc_cls closure for @a proc
573 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block was
577 GNUNET_GNSRECORD_block_decrypt (const struct GNUNET_GNSRECORD_Block *block,
578 const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
580 GNUNET_GNSRECORD_RecordCallback proc,
585 * Compares if two records are equal
588 * @param b another record
589 * @return #GNUNET_YES if the records are equal, or #GNUNET_NO if not.
592 GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
593 const struct GNUNET_GNSRECORD_Data *b);
597 * Returns the expiration time of the given block of records. The block
598 * expiration time is the expiration time of the record with smallest
601 * @param rd_count number of records given in @a rd
602 * @param rd array of records
603 * @return absolute expiration time
605 struct GNUNET_TIME_Absolute
606 GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
607 const struct GNUNET_GNSRECORD_Data *rd);
610 #if 0 /* keep Emacsens' auto-indent happy */
619 /** @} */ /* end of group */