2 This file is part of GNUnet
3 Copyright (C) 2012, 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file include/gnunet_gnsrecord_lib.h
23 * @brief API that can be used to manipulate GNS record data
24 * @author Christian Grothoff
26 #ifndef GNUNET_GNSRECORD_LIB_H
27 #define GNUNET_GNSRECORD_LIB_H
32 #if 0 /* keep Emacsens' auto-indent happy */
38 * Maximum size of a value that can be stored in a GNS block.
40 #define GNUNET_GNSRECORD_MAX_BLOCK_SIZE (63 * 1024)
44 * Record type indicating any record/'*'
46 #define GNUNET_GNSRECORD_TYPE_ANY 0
49 * Record type for GNS zone transfer ("PKEY").
51 #define GNUNET_GNSRECORD_TYPE_PKEY 65536
54 * Record type for GNS nick names ("NICK").
56 #define GNUNET_GNSRECORD_TYPE_NICK 65537
59 * Record type for GNS legacy hostnames ("LEHO").
61 #define GNUNET_GNSRECORD_TYPE_LEHO 65538
64 * Record type for VPN resolution
66 #define GNUNET_GNSRECORD_TYPE_VPN 65539
69 * Record type for delegation to DNS.
71 #define GNUNET_GNSRECORD_TYPE_GNS2DNS 65540
74 * Record type for a boxed record (see TLSA/SRV handling in GNS).
76 #define GNUNET_GNSRECORD_TYPE_BOX 65541
79 * Record type for a social place.
81 #define GNUNET_GNSRECORD_TYPE_PLACE 65542
84 * Record type for a phone (of CONVERSATION).
86 #define GNUNET_GNSRECORD_TYPE_PHONE 65543
89 * Record type for identity attributes (of IDENTITY).
91 #define GNUNET_GNSRECORD_TYPE_ID_ATTR 65544
94 * Record type for an identity token (of IDENTITY).
96 #define GNUNET_GNSRECORD_TYPE_ID_TOKEN 65545
102 * Flags that can be set for a record.
104 enum GNUNET_GNSRECORD_Flags
108 * No special options.
110 GNUNET_GNSRECORD_RF_NONE = 0,
113 * This is a private record of this peer and it should
114 * thus not be handed out to other peers.
116 GNUNET_GNSRECORD_RF_PRIVATE = 2,
119 * This flag is currently unused; former RF_PENDING flag
121 * GNUNET_GNSRECORD_RF_UNUSED = 4,
125 * This expiration time of the record is a relative
126 * time (not an absolute time).
128 GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION = 8,
131 * This record should not be used unless all (other) records with an absolute
132 * expiration time have expired.
134 GNUNET_GNSRECORD_RF_SHADOW_RECORD = 16
137 * When comparing flags for record equality for removal,
138 * which flags should must match (in addition to the type,
139 * name, expiration value and data of the record)? All flags
140 * that are not listed here will be ignored for this purpose.
141 * (for example, we don't expect that users will remember to
142 * pass the '--private' option when removing a record from
143 * the namestore, hence we don't require this particular option
144 * to match upon removal). See also
145 * #GNUNET_GNSRECORD_records_cmp.
147 #define GNUNET_GNSRECORD_RF_RCMP_FLAGS (GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)
154 struct GNUNET_GNSRECORD_Data
158 * Binary value stored in the DNS record. Note: "data" must never
159 * be individually 'malloc'ed, but instead always points into some
160 * existing data area.
165 * Expiration time for the DNS record. Can be relative
166 * or absolute, depending on @e flags. Measured in the same
167 * unit as GNUnet time (microseconds).
169 uint64_t expiration_time;
172 * Number of bytes in @e data.
177 * Type of the GNS/DNS record.
179 uint32_t record_type;
182 * Flags for the record.
184 enum GNUNET_GNSRECORD_Flags flags;
188 GNUNET_NETWORK_STRUCT_BEGIN
191 * Data stored in a PLACE record.
193 struct GNUNET_GNSRECORD_PlaceData
196 * Public key of the place.
198 struct GNUNET_CRYPTO_EddsaPublicKey place_key;
201 * Peer identity of the origin.
203 struct GNUNET_PeerIdentity origin;
206 * Number of relays that follow.
208 uint32_t relay_count GNUNET_PACKED;
210 /* Followed by struct GNUNET_PeerIdentity relays[relay_count] */
215 * Information we have in an encrypted block with record data (i.e. in the DHT).
217 struct GNUNET_GNSRECORD_Block
221 * Signature of the block.
223 struct GNUNET_CRYPTO_EcdsaSignature signature;
226 * Derived key used for signing; hash of this is the query.
228 struct GNUNET_CRYPTO_EcdsaPublicKey derived_key;
231 * Number of bytes signed; also specifies the number of bytes
232 * of encrypted data that follow.
234 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
237 * Expiration time of the block.
239 struct GNUNET_TIME_AbsoluteNBO expiration_time;
241 /* followed by encrypted data */
246 * Record type used to box up SRV and TLSA records. For example, a
247 * TLSA record for "_https._tcp.foo.gnu" will be stored under
248 * "foo.gnu" as a BOX record with service 443 (https) and protocol 6
249 * (tcp) and record_type "TLSA". When a BOX record is received, GNS
250 * unboxes it if the name contained "_SERVICE._PROTO", otherwise GNS
251 * leaves it untouched. This is done to ensure that TLSA (and SRV)
252 * records do not require a separate network request, thus making TLSA
253 * records inseparable from the "main" A/AAAA/VPN/etc. records.
255 struct GNUNET_GNSRECORD_BoxRecord
259 * Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
260 * Yes, in IP protocols are usually limited to 8 bits. In NBO.
262 uint16_t protocol GNUNET_PACKED;
265 * Service of the boxed record (aka port number), in NBO.
267 uint16_t service GNUNET_PACKED;
270 * GNS record type of the boxed record. In NBO.
272 uint32_t record_type GNUNET_PACKED;
274 /* followed by the 'original' record */
279 GNUNET_NETWORK_STRUCT_END
283 * Process a records that were decrypted from a block.
286 * @param rd_count number of entries in @a rd array
287 * @param rd array of records with data to store
289 typedef void (*GNUNET_GNSRECORD_RecordCallback) (void *cls,
290 unsigned int rd_count,
291 const struct GNUNET_GNSRECORD_Data *rd);
295 /* ***************** API related to GNSRECORD plugins ************** */
298 * Convert the binary value @a data of a record of
299 * type @a type to a human-readable string.
301 * @param type type of the record
302 * @param data value in binary encoding
303 * @param data_size number of bytes in @a data
304 * @return NULL on error, otherwise human-readable representation of the value
307 GNUNET_GNSRECORD_value_to_string (uint32_t type,
313 * Convert human-readable version of the value @a s of a record
314 * of type @a type to the respective binary representation.
316 * @param type type of the record
317 * @param s human-readable string
318 * @param data set to value in binary encoding (will be allocated)
319 * @param data_size set to number of bytes in @a data
320 * @return #GNUNET_OK on success
323 GNUNET_GNSRECORD_string_to_value (uint32_t type,
330 * Convert a type name (i.e. "AAAA") to the corresponding number.
332 * @param dns_typename name to convert
333 * @return corresponding number, UINT32_MAX on error
336 GNUNET_GNSRECORD_typename_to_number (const char *dns_typename);
340 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
342 * @param type number of a type to convert
343 * @return corresponding typestring, NULL on error
346 GNUNET_GNSRECORD_number_to_typename (uint32_t type);
349 /* convenience APIs for serializing / deserializing GNS records */
352 * Calculate how many bytes we will need to serialize the given
355 * @param rd_count number of records in the @a rd array
356 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
357 * @return the required size to serialize
360 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
361 const struct GNUNET_GNSRECORD_Data *rd);
365 * Serialize the given records to the given destination buffer.
367 * @param rd_count number of records in the @a rd array
368 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
369 * @param dest_size size of the destination array @a dst
370 * @param dest where to write the result
371 * @return the size of serialized records, -1 if records do not fit
374 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
375 const struct GNUNET_GNSRECORD_Data *rd,
381 * Deserialize the given records to the given destination.
383 * @param len size of the serialized record data
384 * @param src the serialized record data
385 * @param rd_count number of records in the @a dest array
386 * @param dest where to put the data
387 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
390 GNUNET_GNSRECORD_records_deserialize (size_t len,
392 unsigned int rd_count,
393 struct GNUNET_GNSRECORD_Data *dest);
396 /* ******* general APIs relating to blocks, records and labels ******** */
401 * Test if a given record is expired.
403 * @param rd record to test
404 * @return #GNUNET_YES if the record is expired,
408 GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd);
412 * Convert a UTF-8 string to UTF-8 lowercase
413 * @param src source string
414 * @return converted result
417 GNUNET_GNSRECORD_string_to_lowercase (const char *src);
421 * Convert a zone to a string (for printing debug messages).
422 * This is one of the very few calls in the entire API that is
425 * @param z public key of a zone
426 * @return string form; will be overwritten by next call to #GNUNET_GNSRECORD_z2s.
429 GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z);
433 * Convert public key to the respective absolute domain name in the
435 * This is one of the very few calls in the entire API that is
438 * @param pkey a public key with a point on the eliptic curve
439 * @return string "X.zkey" where X is the coordinates of the public
440 * key in an encoding suitable for DNS labels.
443 GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
447 * Convert an absolute domain name in the ".zkey" pTLD to the
448 * respective public key.
450 * @param zkey string "X.zkey" where X is the public
451 * key in an encoding suitable for DNS labels.
452 * @param pkey set to a public key on the eliptic curve
453 * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
456 GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
457 struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
461 * Calculate the DHT query for a given @a label in a given @a zone.
463 * @param zone private key of the zone
464 * @param label label of the record
465 * @param query hash to use for the query
468 GNUNET_GNSRECORD_query_from_private_key (const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
470 struct GNUNET_HashCode *query);
474 * Calculate the DHT query for a given @a label in a given @a zone.
476 * @param pub public key of the zone
477 * @param label label of the record
478 * @param query hash to use for the query
481 GNUNET_GNSRECORD_query_from_public_key (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
483 struct GNUNET_HashCode *query);
487 * Sign name and records
489 * @param key the private key
490 * @param expire block expiration
491 * @param label the name for the records
492 * @param rd record data
493 * @param rd_count number of records in @a rd
495 struct GNUNET_GNSRECORD_Block *
496 GNUNET_GNSRECORD_block_create (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
497 struct GNUNET_TIME_Absolute expire,
499 const struct GNUNET_GNSRECORD_Data *rd,
500 unsigned int rd_count);
504 * Check if a signature is valid. This API is used by the GNS Block
505 * to validate signatures received from the network.
507 * @param block block to verify
508 * @return #GNUNET_OK if the signature is valid
511 GNUNET_GNSRECORD_block_verify (const struct GNUNET_GNSRECORD_Block *block);
517 * @param block block to decrypt
518 * @param zone_key public key of the zone
519 * @param label the name for the records
520 * @param proc function to call with the result
521 * @param proc_cls closure for @a proc
522 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block was
526 GNUNET_GNSRECORD_block_decrypt (const struct GNUNET_GNSRECORD_Block *block,
527 const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
529 GNUNET_GNSRECORD_RecordCallback proc,
534 * Compares if two records are equal
537 * @param b another record
538 * @return #GNUNET_YES if the records are equal, or #GNUNET_NO if not.
541 GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
542 const struct GNUNET_GNSRECORD_Data *b);
546 * Returns the expiration time of the given block of records. The block
547 * expiration time is the expiration time of the record with smallest
550 * @param rd_count number of records given in @a rd
551 * @param rd array of records
552 * @return absolute expiration time
554 struct GNUNET_TIME_Absolute
555 GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
556 const struct GNUNET_GNSRECORD_Data *rd);
560 #if 0 /* keep Emacsens' auto-indent happy */