2 This file is part of GNUnet
3 (C) 2012 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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file mesh/plugin_block_mesh.c
23 * @brief blocks used for mesh peer discovery
24 * @author Bartlomiej Polot
28 #include "gnunet_block_plugin.h"
29 #include "block_mesh.h"
30 #include "mesh_block_lib.h"
33 * Number of bits we set per entry in the bloomfilter.
36 #define BLOOMFILTER_K 16
40 * Function called to validate a reply or a request. For
41 * request evaluation, simply pass "NULL" for the reply_block.
42 * Note that it is assumed that the reply has already been
43 * matched to the key (and signatures checked) as it would
44 * be done with the "get_key" function.
47 * @param type block type
48 * @param query original query (hash)
49 * @param bf pointer to bloom filter associated with query; possibly updated (!)
50 * @param bf_mutator mutation value for bf
51 * @param xquery extrended query data (can be NULL, depending on type)
52 * @param xquery_size number of bytes in xquery
53 * @param reply_block response to validate
54 * @param reply_block_size number of bytes in reply block
55 * @return characterization of result
57 static enum GNUNET_BLOCK_EvaluationResult
58 block_plugin_mesh_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
59 const struct GNUNET_HashCode * query,
60 struct GNUNET_CONTAINER_BloomFilter **bf,
61 int32_t bf_mutator, const void *xquery,
62 size_t xquery_size, const void *reply_block,
63 size_t reply_block_size)
65 struct GNUNET_HashCode chash;
66 struct GNUNET_HashCode mhash;
70 case GNUNET_BLOCK_TYPE_MESH_PEER:
74 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
76 if (NULL == reply_block)
77 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
78 if (sizeof (struct PBlock) != reply_block_size)
79 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
82 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
83 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
86 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
87 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
91 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
93 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
96 return GNUNET_BLOCK_EVALUATION_OK_LAST;
99 case GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE:
100 /* FIXME: have an xquery? not sure */
101 if (0 != xquery_size)
104 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
106 if (NULL == reply_block)
107 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
108 if (sizeof (struct PBlock) != reply_block_size)
111 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
115 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
116 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
119 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
120 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
124 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
126 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
128 return GNUNET_BLOCK_EVALUATION_OK_MORE;
131 case GNUNET_BLOCK_TYPE_MESH_REGEX:
132 if (NULL == reply_block)
133 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
134 if (0 != xquery_size)
138 query = (const char *) xquery;
139 if ('\0' != query[xquery_size - 1]) /* must be valid string */
141 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
142 "Block xquery not a valid string\n");
143 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
149 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
151 switch (GNUNET_MESH_regex_block_check (reply_block,
157 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
160 "BLOCK XQUERY %s not accepted\n", xquery);
161 return GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT;
163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
164 "BLOCK XQUERY %s accepted\n", xquery);
169 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
170 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
173 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
174 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
178 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
180 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
182 return GNUNET_BLOCK_EVALUATION_OK_MORE;
185 case GNUNET_BLOCK_TYPE_MESH_REGEX_ACCEPT:
186 if (0 != xquery_size)
189 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
191 if (NULL == reply_block)
192 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
193 if (sizeof (struct MeshRegexAccept) != reply_block_size)
196 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
200 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
201 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
204 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
205 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
209 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
211 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
213 return GNUNET_BLOCK_EVALUATION_OK_MORE;
217 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
223 * Function called to obtain the key for a block.
226 * @param type block type
227 * @param block block to get the key for
228 * @param block_size number of bytes in block
229 * @param key set to the key (query) for the given block
230 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
231 * (or if extracting a key from a block of this type does not work)
234 block_plugin_mesh_get_key (void *cls, enum GNUNET_BLOCK_Type type,
235 const void *block, size_t block_size,
236 struct GNUNET_HashCode * key)
238 const struct PBlock *pb;
243 case GNUNET_BLOCK_TYPE_MESH_PEER:
244 if (sizeof (struct PBlock) != block_size)
245 return GNUNET_SYSERR;
246 *key = pb->id.hashPubKey;
248 case GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE:
249 GNUNET_CRYPTO_hash (&pb->type, sizeof(GNUNET_MESH_ApplicationType), key);
252 return GNUNET_SYSERR;
258 * Entry point for the plugin.
261 libgnunet_plugin_block_mesh_init (void *cls)
263 static enum GNUNET_BLOCK_Type types[] =
265 GNUNET_BLOCK_TYPE_MESH_PEER,
266 GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE,
267 GNUNET_BLOCK_TYPE_MESH_REGEX,
268 GNUNET_BLOCK_TYPE_MESH_REGEX_ACCEPT,
269 GNUNET_BLOCK_TYPE_ANY /* end of list */
271 struct GNUNET_BLOCK_PluginFunctions *api;
273 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
274 api->evaluate = &block_plugin_mesh_evaluate;
275 api->get_key = &block_plugin_mesh_get_key;
282 * Exit point from the plugin.
285 libgnunet_plugin_block_mesh_done (void *cls)
287 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
293 /* end of plugin_block_mesh.c */