/*
This file is part of GNUnet
- (C) 2012, 2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2012, 2013 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
- * @file include/gnunet_gnsrecord_lib.h
- * @brief API that can be used to manipulate GNS record data
* @author Christian Grothoff
+ *
+ * @file
+ * API that can be used to manipulate GNS record data
+ *
+ * @defgroup gnsrecord GNS Record library
+ * Manipulate GNS record data
+ *
+ * @see [Documentation](https://gnunet.org/gns-plugins)
+ *
+ * @{
*/
#ifndef GNUNET_GNSRECORD_LIB_H
#define GNUNET_GNSRECORD_LIB_H
#endif
#endif
+/**
+ * Maximum size of a value that can be stored in a GNS block.
+ */
+#define GNUNET_GNSRECORD_MAX_BLOCK_SIZE (63 * 1024)
+
/**
* Record type indicating any record/'*'
#define GNUNET_GNSRECORD_TYPE_PKEY 65536
/**
- * Record type for GNS zone transfer ("PSEU").
+ * Record type for GNS nick names ("NICK").
*/
-#define GNUNET_GNSRECORD_TYPE_PSEU 65537
+#define GNUNET_GNSRECORD_TYPE_NICK 65537
/**
* Record type for GNS legacy hostnames ("LEHO").
*/
#define GNUNET_GNSRECORD_TYPE_GNS2DNS 65540
+/**
+ * Record type for a boxed record (see TLSA/SRV handling in GNS).
+ */
+#define GNUNET_GNSRECORD_TYPE_BOX 65541
+
/**
* Record type for a social place.
*/
-#define GNUNET_GNSRECORD_TYPE_PLACE 65541
+#define GNUNET_GNSRECORD_TYPE_PLACE 65542
/**
* Record type for a phone (of CONVERSATION).
*/
-#define GNUNET_GNSRECORD_TYPE_PHONE 65542
+#define GNUNET_GNSRECORD_TYPE_PHONE 65543
+
+/**
+ * Record type for identity attributes (of IDENTITY).
+ */
+#define GNUNET_GNSRECORD_TYPE_ID_ATTR 65544
+
+/**
+ * Record type for an identity token (of IDENTITY-TOKEN).
+ */
+#define GNUNET_GNSRECORD_TYPE_ID_TOKEN 65545
+
+/**
+ * Record type for the private metadata of an identity token (of IDENTITY-TOKEN).
+ */
+#define GNUNET_GNSRECORD_TYPE_ID_TOKEN_METADATA 65546
+
+/**
+ * Record type for reverse lookups
+ */
+#define GNUNET_GNSRECORD_TYPE_REVERSE 65548
+
+/**
+ * Flags that can be set for a record.
+ */
+enum GNUNET_GNSRECORD_Flags
+{
+
+ /**
+ * No special options.
+ */
+ GNUNET_GNSRECORD_RF_NONE = 0,
+
+ /**
+ * This is a private record of this peer and it should
+ * thus not be handed out to other peers.
+ */
+ GNUNET_GNSRECORD_RF_PRIVATE = 2,
+
+ /**
+ * This flag is currently unused; former RF_PENDING flag
+ *
+ * GNUNET_GNSRECORD_RF_UNUSED = 4,
+ */
+
+ /**
+ * This expiration time of the record is a relative
+ * time (not an absolute time).
+ */
+ GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION = 8,
+
+ /**
+ * This record should not be used unless all (other) records with an absolute
+ * expiration time have expired.
+ */
+ GNUNET_GNSRECORD_RF_SHADOW_RECORD = 16
+
+ /**
+ * When comparing flags for record equality for removal,
+ * which flags should must match (in addition to the type,
+ * name, expiration value and data of the record)? All flags
+ * that are not listed here will be ignored for this purpose.
+ * (for example, we don't expect that users will remember to
+ * pass the '--private' option when removing a record from
+ * the namestore, hence we don't require this particular option
+ * to match upon removal). See also
+ * #GNUNET_GNSRECORD_records_cmp.
+ */
+#define GNUNET_GNSRECORD_RF_RCMP_FLAGS (GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)
+};
+
+
+/**
+ * A GNS record.
+ */
+struct GNUNET_GNSRECORD_Data
+{
+
+ /**
+ * Binary value stored in the DNS record. Note: "data" must never
+ * be individually 'malloc'ed, but instead always points into some
+ * existing data area.
+ */
+ const void *data;
+
+ /**
+ * Expiration time for the DNS record. Can be relative
+ * or absolute, depending on @e flags. Measured in the same
+ * unit as GNUnet time (microseconds).
+ */
+ uint64_t expiration_time;
+
+ /**
+ * Number of bytes in @e data.
+ */
+ size_t data_size;
+
+ /**
+ * Type of the GNS/DNS record.
+ */
+ uint32_t record_type;
+
+ /**
+ * Flags for the record.
+ */
+ enum GNUNET_GNSRECORD_Flags flags;
+};
+
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Data stored in a PLACE record.
+ */
+struct GNUNET_GNSRECORD_PlaceData
+{
+ /**
+ * Public key of the place.
+ */
+ struct GNUNET_CRYPTO_EddsaPublicKey place_pub_key;
+
+ /**
+ * Peer identity of the origin.
+ */
+ struct GNUNET_PeerIdentity origin;
+
+ /**
+ * Number of relays that follow.
+ */
+ uint32_t relay_count GNUNET_PACKED;
+
+ /* Followed by struct GNUNET_PeerIdentity relays[relay_count] */
+};
+
+
+/**
+ * Information we have in an encrypted block with record data (i.e. in the DHT).
+ */
+struct GNUNET_GNSRECORD_Block
+{
+
+ /**
+ * Signature of the block.
+ */
+ struct GNUNET_CRYPTO_EcdsaSignature signature;
+
+ /**
+ * Derived key used for signing; hash of this is the query.
+ */
+ struct GNUNET_CRYPTO_EcdsaPublicKey derived_key;
+
+ /**
+ * Number of bytes signed; also specifies the number of bytes
+ * of encrypted data that follow.
+ */
+ struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+ /**
+ * Expiration time of the block.
+ */
+ struct GNUNET_TIME_AbsoluteNBO expiration_time;
+ /* followed by encrypted data */
+};
+/**
+ * Record type used to box up SRV and TLSA records. For example, a
+ * TLSA record for "_https._tcp.foo.gnu" will be stored under
+ * "foo.gnu" as a BOX record with service 443 (https) and protocol 6
+ * (tcp) and record_type "TLSA". When a BOX record is received, GNS
+ * unboxes it if the name contained "_SERVICE._PROTO", otherwise GNS
+ * leaves it untouched. This is done to ensure that TLSA (and SRV)
+ * records do not require a separate network request, thus making TLSA
+ * records inseparable from the "main" A/AAAA/VPN/etc. records.
+ */
+struct GNUNET_GNSRECORD_BoxRecord
+{
+
+ /**
+ * Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
+ * Yes, in IP protocols are usually limited to 8 bits. In NBO.
+ */
+ uint16_t protocol GNUNET_PACKED;
+
+ /**
+ * Service of the boxed record (aka port number), in NBO.
+ */
+ uint16_t service GNUNET_PACKED;
+
+ /**
+ * GNS record type of the boxed record. In NBO.
+ */
+ uint32_t record_type GNUNET_PACKED;
+
+ /* followed by the 'original' record */
+
+};
+
+/**
+ * Record type used internally to keep track of reverse mappings into a
+ * namespace.
+ * The record contains data related to PKEY delegations from other namespaces to
+ * the namespace the record belongs to.
+ * It is exclusively found under the label ``+''.
+ */
+struct GNUNET_GNSRECORD_ReverseRecord
+{
+ /**
+ * The public key of the namespace the is delegating to our namespace
+ */
+ struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
+
+ /**
+ * The expiration time of the delegation
+ */
+ struct GNUNET_TIME_Absolute expiration;
+
+ /* followed by the name the delegator uses to refer to our namespace */
+};
+
+GNUNET_NETWORK_STRUCT_END
+
+
+/**
+ * Process a records that were decrypted from a block.
+ *
+ * @param cls closure
+ * @param rd_count number of entries in @a rd array
+ * @param rd array of records with data to store
+ */
+typedef void (*GNUNET_GNSRECORD_RecordCallback) (void *cls,
+ unsigned int rd_count,
+ const struct GNUNET_GNSRECORD_Data *rd);
+
+
+
+/* ***************** API related to GNSRECORD plugins ************** */
+
/**
* Convert the binary value @a data of a record of
* type @a type to a human-readable string.
GNUNET_GNSRECORD_number_to_typename (uint32_t type);
+/* convenience APIs for serializing / deserializing GNS records */
+
+/**
+ * Calculate how many bytes we will need to serialize the given
+ * records.
+ *
+ * @param rd_count number of records in the @a rd array
+ * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
+ * @return the required size to serialize
+ */
+size_t
+GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
+ const struct GNUNET_GNSRECORD_Data *rd);
+
+
+/**
+ * Serialize the given records to the given destination buffer.
+ *
+ * @param rd_count number of records in the @a rd array
+ * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
+ * @param dest_size size of the destination array @a dst
+ * @param dest where to write the result
+ * @return the size of serialized records, -1 if records do not fit
+ */
+ssize_t
+GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
+ const struct GNUNET_GNSRECORD_Data *rd,
+ size_t dest_size,
+ char *dest);
+
+
+/**
+ * Deserialize the given records to the given destination.
+ *
+ * @param len size of the serialized record data
+ * @param src the serialized record data
+ * @param rd_count number of records in the @a dest array
+ * @param dest where to put the data
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+GNUNET_GNSRECORD_records_deserialize (size_t len,
+ const char *src,
+ unsigned int rd_count,
+ struct GNUNET_GNSRECORD_Data *dest);
+
+
+/* ******* general APIs relating to blocks, records and labels ******** */
+
+
+
+/**
+ * Test if a given record is expired.
+ *
+ * @param rd record to test
+ * @return #GNUNET_YES if the record is expired,
+ * #GNUNET_NO if not
+ */
+int
+GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd);
+
+
+/**
+ * Convert a UTF-8 string to UTF-8 lowercase
+ * @param src source string
+ * @return converted result
+ */
+char *
+GNUNET_GNSRECORD_string_to_lowercase (const char *src);
+
+
+/**
+ * Convert a zone to a string (for printing debug messages).
+ * This is one of the very few calls in the entire API that is
+ * NOT reentrant!
+ *
+ * @param z public key of a zone
+ * @return string form; will be overwritten by next call to #GNUNET_GNSRECORD_z2s.
+ */
+const char *
+GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z);
+
+
+/**
+ * Convert public key to the respective absolute domain name in the
+ * ".zkey" pTLD.
+ * This is one of the very few calls in the entire API that is
+ * NOT reentrant!
+ *
+ * @param pkey a public key with a point on the eliptic curve
+ * @return string "X.zkey" where X is the coordinates of the public
+ * key in an encoding suitable for DNS labels.
+ */
+const char *
+GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
+
+
+/**
+ * Convert an absolute domain name in the ".zkey" pTLD to the
+ * respective public key.
+ *
+ * @param zkey string "X.zkey" where X is the public
+ * key in an encoding suitable for DNS labels.
+ * @param pkey set to a public key on the eliptic curve
+ * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
+ */
+int
+GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
+ struct GNUNET_CRYPTO_EcdsaPublicKey *pkey);
+
+
+/**
+ * Calculate the DHT query for a given @a label in a given @a zone.
+ *
+ * @param zone private key of the zone
+ * @param label label of the record
+ * @param query hash to use for the query
+ */
+void
+GNUNET_GNSRECORD_query_from_private_key (const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
+ const char *label,
+ struct GNUNET_HashCode *query);
+
+
+/**
+ * Calculate the DHT query for a given @a label in a given @a zone.
+ *
+ * @param pub public key of the zone
+ * @param label label of the record
+ * @param query hash to use for the query
+ */
+void
+GNUNET_GNSRECORD_query_from_public_key (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
+ const char *label,
+ struct GNUNET_HashCode *query);
+
+
+/**
+ * Sign name and records
+ *
+ * @param key the private key
+ * @param expire block expiration
+ * @param label the name for the records
+ * @param rd record data
+ * @param rd_count number of records in @a rd
+ */
+struct GNUNET_GNSRECORD_Block *
+GNUNET_GNSRECORD_block_create (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
+ struct GNUNET_TIME_Absolute expire,
+ const char *label,
+ const struct GNUNET_GNSRECORD_Data *rd,
+ unsigned int rd_count);
+
+
+/**
+ * Check if a signature is valid. This API is used by the GNS Block
+ * to validate signatures received from the network.
+ *
+ * @param block block to verify
+ * @return #GNUNET_OK if the signature is valid
+ */
+int
+GNUNET_GNSRECORD_block_verify (const struct GNUNET_GNSRECORD_Block *block);
+
+
+/**
+ * Decrypt block.
+ *
+ * @param block block to decrypt
+ * @param zone_key public key of the zone
+ * @param label the name for the records
+ * @param proc function to call with the result
+ * @param proc_cls closure for @a proc
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block was
+ * not well-formed
+ */
+int
+GNUNET_GNSRECORD_block_decrypt (const struct GNUNET_GNSRECORD_Block *block,
+ const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
+ const char *label,
+ GNUNET_GNSRECORD_RecordCallback proc,
+ void *proc_cls);
+
+
+/**
+ * Compares if two records are equal
+ *
+ * @param a a record
+ * @param b another record
+ * @return #GNUNET_YES if the records are equal, or #GNUNET_NO if not.
+ */
+int
+GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
+ const struct GNUNET_GNSRECORD_Data *b);
+
+
+/**
+ * Returns the expiration time of the given block of records. The block
+ * expiration time is the expiration time of the record with smallest
+ * expiration time.
+ *
+ * @param rd_count number of records given in @a rd
+ * @param rd array of records
+ * @return absolute expiration time
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
+ const struct GNUNET_GNSRECORD_Data *rd);
+
+
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#endif
#endif
+
+/** @} */ /* end of group */
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