2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff (and other contributing authors)
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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
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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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 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 .gnunet-domains
102 GNUNET_BLOCK_TYPE_DNS = 10,
105 * Block for storing record data
107 GNUNET_BLOCK_TYPE_GNS_NAMERECORD = 11,
110 * Block for storing mesh peers
112 GNUNET_BLOCK_TYPE_MESH_PEER = 20,
115 * Block for finding peers by type
117 GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE = 21,
120 * Block to store a mesh regex state
122 GNUNET_BLOCK_TYPE_REGEX = 22,
125 * Block to store a mesh regex accepting state
127 GNUNET_BLOCK_TYPE_REGEX_ACCEPT = 23
132 * Possible ways for how a block may relate to a query.
134 enum GNUNET_BLOCK_EvaluationResult
137 * Valid result, and there may be more.
139 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
142 * Last possible valid result.
144 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
147 * Valid result, but suppressed because it is a duplicate.
149 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
152 * Block does not match query (invalid result)
154 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
157 * Block does not match xquery (valid result, not relevant for the request)
159 GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT = 4,
162 * Query is valid, no reply given.
164 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 10,
167 * Query format does not match block type (invalid query). For
168 * example, xquery not given or xquery_size not appropriate for
171 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 11,
174 * Specified block type not supported by this plugin.
176 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 20
181 * Handle to an initialized block library.
183 struct GNUNET_BLOCK_Context;
187 * Mingle hash with the mingle_number to produce different bits.
189 * @param in original hash code
190 * @param mingle_number number for hash permutation
191 * @param hc where to store the result.
194 GNUNET_BLOCK_mingle_hash (const struct GNUNET_HashCode * in, uint32_t mingle_number,
195 struct GNUNET_HashCode * hc);
199 * Create a block context. Loads the block plugins.
201 * @param cfg configuration to use
202 * @return NULL on error
204 struct GNUNET_BLOCK_Context *
205 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
209 * Destroy the block context.
211 * @param ctx context to destroy
214 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
218 * Function called to validate a reply or a request. For
219 * request evaluation, simply pass "NULL" for the reply_block.
220 * Note that it is assumed that the reply has already been
221 * matched to the key (and signatures checked) as it would
222 * be done with the "get_key" function.
224 * @param ctx block contxt
225 * @param type block type
226 * @param query original query (hash)
227 * @param bf pointer to bloom filter associated with query; possibly updated (!)
228 * @param bf_mutator mutation value for bf
229 * @param xquery extrended query data (can be NULL, depending on type)
230 * @param xquery_size number of bytes in xquery
231 * @param reply_block response to validate
232 * @param reply_block_size number of bytes in reply block
233 * @return characterization of result
235 enum GNUNET_BLOCK_EvaluationResult
236 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
237 enum GNUNET_BLOCK_Type type,
238 const struct GNUNET_HashCode * query,
239 struct GNUNET_CONTAINER_BloomFilter **bf,
240 int32_t bf_mutator, const void *xquery,
241 size_t xquery_size, const void *reply_block,
242 size_t reply_block_size);
246 * Function called to obtain the key for a block.
248 * @param ctx block context
249 * @param type block type
250 * @param block block to get the key for
251 * @param block_size number of bytes in block
252 * @param key set to the key (query) for the given block
253 * @return GNUNET_YES on success,
254 * GNUNET_NO if the block is malformed
255 * GNUNET_SYSERR if type not supported
256 * (or if extracting a key from a block of this type does not work)
259 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
260 enum GNUNET_BLOCK_Type type, const void *block,
261 size_t block_size, struct GNUNET_HashCode * key);
266 * Construct a bloom filter that would filter out the given
269 * @param bf_mutator mutation value to use
270 * @param seen_results results already seen
271 * @param seen_results_count number of entries in 'seen_results'
272 * @return NULL if seen_results_count is 0, otherwise a BF
273 * that would match the given results.
275 struct GNUNET_CONTAINER_BloomFilter *
276 GNUNET_BLOCK_construct_bloomfilter (int32_t bf_mutator,
277 const struct GNUNET_HashCode * seen_results,
278 unsigned int seen_results_count);
281 #if 0 /* keep Emacsens' auto-indent happy */
289 /* ifndef GNUNET_BLOCK_LIB_H */
291 /* end of gnunet_block_lib.h */