2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff (and other contributing authors)
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22 * @file include/gnunet_block_lib.h
23 * @brief library for data block manipulation
24 * @author Christian Grothoff
26 #ifndef GNUNET_BLOCK_LIB_H
27 #define GNUNET_BLOCK_LIB_H
29 #include "gnunet_util_lib.h"
33 #if 0 /* keep Emacsens' auto-indent happy */
40 * Blocks in the datastore and the datacache must have a unique type.
42 enum GNUNET_BLOCK_Type
45 * Any type of block, used as a wildcard when searching. Should
46 * never be attached to a specific block.
48 GNUNET_BLOCK_TYPE_ANY = 0,
51 * Data block (leaf) in the CHK tree.
53 GNUNET_BLOCK_TYPE_FS_DBLOCK = 1,
56 * Inner block in the CHK tree.
58 GNUNET_BLOCK_TYPE_FS_IBLOCK = 2,
61 * Legacy type, no longer in use.
63 GNUNET_BLOCK_TYPE_FS_KBLOCK = 3,
66 * Legacy type, no longer in use.
68 GNUNET_BLOCK_TYPE_FS_SBLOCK = 4,
71 * Legacy type, no longer in use.
73 GNUNET_BLOCK_TYPE_FS_NBLOCK = 5,
76 * Type of a block representing a block to be encoded on demand from disk.
77 * Should never appear on the network directly.
79 GNUNET_BLOCK_TYPE_FS_ONDEMAND = 6,
82 * Type of a block that contains a HELLO for a peer (for
83 * DHT and CADET find-peer operations).
85 GNUNET_BLOCK_TYPE_DHT_HELLO = 7,
90 GNUNET_BLOCK_TYPE_TEST = 8,
93 * Type of a block representing any type of search result
94 * (universal). Implemented in the context of #2564, replaces
95 * SBLOCKS, KBLOCKS and NBLOCKS.
97 GNUNET_BLOCK_TYPE_FS_UBLOCK = 9,
100 * Block for storing DNS exit service advertisements.
102 GNUNET_BLOCK_TYPE_DNS = 10,
105 * Block for storing record data
107 GNUNET_BLOCK_TYPE_GNS_NAMERECORD = 11,
110 * Block to store a cadet regex state
112 GNUNET_BLOCK_TYPE_REGEX = 22,
115 * Block to store a cadet regex accepting state
117 GNUNET_BLOCK_TYPE_REGEX_ACCEPT = 23
122 * Possible ways for how a block may relate to a query.
124 enum GNUNET_BLOCK_EvaluationResult
127 * Valid result, and there may be more.
129 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
132 * Last possible valid result.
134 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
137 * Valid result, but suppressed because it is a duplicate.
139 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
142 * Block does not match query (invalid result)
144 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
147 * Block does not match xquery (valid result, not relevant for the request)
149 GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT = 4,
152 * Query is valid, no reply given.
154 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 10,
157 * Query format does not match block type (invalid query). For
158 * example, xquery not given or xquery_size not appropriate for
161 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 11,
164 * Specified block type not supported by this plugin.
166 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 20
171 * Handle to an initialized block library.
173 struct GNUNET_BLOCK_Context;
177 * Mingle hash with the mingle_number to produce different bits.
179 * @param in original hash code
180 * @param mingle_number number for hash permutation
181 * @param hc where to store the result.
184 GNUNET_BLOCK_mingle_hash (const struct GNUNET_HashCode * in, uint32_t mingle_number,
185 struct GNUNET_HashCode * hc);
189 * Create a block context. Loads the block plugins.
191 * @param cfg configuration to use
192 * @return NULL on error
194 struct GNUNET_BLOCK_Context *
195 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
199 * Destroy the block context.
201 * @param ctx context to destroy
204 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
208 * Function called to validate a reply or a request. For
209 * request evaluation, simply pass "NULL" for the reply_block.
210 * Note that it is assumed that the reply has already been
211 * matched to the key (and signatures checked) as it would
212 * be done with the "get_key" function.
214 * @param ctx block contxt
215 * @param type block type
216 * @param query original query (hash)
217 * @param bf pointer to bloom filter associated with query; possibly updated (!)
218 * @param bf_mutator mutation value for @a bf
219 * @param xquery extrended query data (can be NULL, depending on type)
220 * @param xquery_size number of bytes in @a xquery
221 * @param reply_block response to validate
222 * @param reply_block_size number of bytes in @a reply_block
223 * @return characterization of result
225 enum GNUNET_BLOCK_EvaluationResult
226 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
227 enum GNUNET_BLOCK_Type type,
228 const struct GNUNET_HashCode * query,
229 struct GNUNET_CONTAINER_BloomFilter **bf,
230 int32_t bf_mutator, const void *xquery,
231 size_t xquery_size, const void *reply_block,
232 size_t reply_block_size);
236 * Function called to obtain the key for a block.
238 * @param ctx block context
239 * @param type block type
240 * @param block block to get the key for
241 * @param block_size number of bytes in @a block
242 * @param key set to the key (query) for the given block
243 * @return #GNUNET_YES on success,
244 * #GNUNET_NO if the block is malformed
245 * #GNUNET_SYSERR if type not supported
246 * (or if extracting a key from a block of this type does not work)
249 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
250 enum GNUNET_BLOCK_Type type, const void *block,
251 size_t block_size, struct GNUNET_HashCode * key);
256 * Construct a bloom filter that would filter out the given
259 * @param bf_mutator mutation value to use
260 * @param seen_results results already seen
261 * @param seen_results_count number of entries in @a seen_results
262 * @return NULL if seen_results_count is 0, otherwise a BF
263 * that would match the given results.
265 struct GNUNET_CONTAINER_BloomFilter *
266 GNUNET_BLOCK_construct_bloomfilter (int32_t bf_mutator,
267 const struct GNUNET_HashCode * seen_results,
268 unsigned int seen_results_count);
271 #if 0 /* keep Emacsens' auto-indent happy */
279 /* ifndef GNUNET_BLOCK_LIB_H */
281 /* end of gnunet_block_lib.h */