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;
80 return GNUNET_BLOCK_EVALUATION_OK_LAST;
81 case GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE:
82 /* FIXME: have an xquery? not sure */
86 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
88 if (NULL == reply_block)
89 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
90 if (sizeof (struct PBlock) != reply_block_size)
91 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
94 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
95 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
98 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
99 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
103 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
105 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
107 return GNUNET_BLOCK_EVALUATION_OK_MORE;
108 case GNUNET_BLOCK_TYPE_MESH_REGEX:
109 if (0 != xquery_size)
112 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
114 if (NULL == reply_block)
115 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
116 if (GNUNET_OK != GNUNET_MESH_regex_block_check (reply_block,
118 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
121 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
122 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
125 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
126 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
130 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
132 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
134 return GNUNET_BLOCK_EVALUATION_OK_MORE;
135 case GNUNET_BLOCK_TYPE_MESH_REGEX_ACCEPT:
136 if (0 != xquery_size)
139 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
141 if (NULL == reply_block)
142 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
143 if (sizeof (struct MeshRegexAccept) != reply_block_size)
144 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
147 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
148 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
151 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
152 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
156 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
158 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
160 return GNUNET_BLOCK_EVALUATION_OK_MORE;
162 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
168 * Function called to obtain the key for a block.
171 * @param type block type
172 * @param block block to get the key for
173 * @param block_size number of bytes in block
174 * @param key set to the key (query) for the given block
175 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
176 * (or if extracting a key from a block of this type does not work)
179 block_plugin_mesh_get_key (void *cls, enum GNUNET_BLOCK_Type type,
180 const void *block, size_t block_size,
181 struct GNUNET_HashCode * key)
183 const struct PBlock *pb;
188 case GNUNET_BLOCK_TYPE_MESH_PEER:
189 if (sizeof (struct PBlock) != block_size)
190 return GNUNET_SYSERR;
191 *key = pb->id.hashPubKey;
193 case GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE:
194 GNUNET_CRYPTO_hash (&pb->type, sizeof(GNUNET_MESH_ApplicationType), key);
197 return GNUNET_SYSERR;
203 * Entry point for the plugin.
206 libgnunet_plugin_block_mesh_init (void *cls)
208 static enum GNUNET_BLOCK_Type types[] =
210 GNUNET_BLOCK_TYPE_MESH_PEER,
211 GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE,
212 GNUNET_BLOCK_TYPE_MESH_REGEX,
213 GNUNET_BLOCK_TYPE_MESH_REGEX_ACCEPT,
214 GNUNET_BLOCK_TYPE_ANY /* end of list */
216 struct GNUNET_BLOCK_PluginFunctions *api;
218 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
219 api->evaluate = &block_plugin_mesh_evaluate;
220 api->get_key = &block_plugin_mesh_get_key;
227 * Exit point from the plugin.
230 libgnunet_plugin_block_mesh_done (void *cls)
232 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
238 /* end of plugin_block_mesh.c */