2 This file is part of GNUnet
3 (C) 2010, 2013 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 fs/plugin_block_fs.c
23 * @brief blocks used for file-sharing
24 * @author Christian Grothoff
28 #include "gnunet_block_plugin.h"
30 #include "gnunet_signatures.h"
34 * Number of bits we set per entry in the bloomfilter.
37 #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_fs_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 const struct UBlock *ub;
66 struct GNUNET_HashCode hc;
67 struct GNUNET_HashCode chash;
68 struct GNUNET_HashCode mhash;
72 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
73 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
77 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
79 if (NULL == reply_block)
80 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
81 return GNUNET_BLOCK_EVALUATION_OK_LAST;
82 case GNUNET_BLOCK_TYPE_FS_UBLOCK:
86 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
88 if (NULL == reply_block)
89 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
91 if (reply_block_size < sizeof (struct UBlock))
94 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
97 GNUNET_CRYPTO_hash (&ub->verification_key,
98 sizeof (ub->verification_key),
100 if (0 != memcmp (&hc,
102 sizeof (struct GNUNET_HashCode)))
105 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
107 if (reply_block_size != ntohl (ub->purpose.size) + sizeof (struct GNUNET_PseudonymSignature))
110 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
113 GNUNET_PSEUDONYM_verify (&ub->purpose,
115 &ub->verification_key))
118 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
122 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
123 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
126 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
127 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
131 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
133 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
135 return GNUNET_BLOCK_EVALUATION_OK_MORE;
137 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
143 * Function called to obtain the key for a block.
146 * @param type block type
147 * @param block block to get the key for
148 * @param block_size number of bytes in block
149 * @param key set to the key (query) for the given block
150 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
151 * (or if extracting a key from a block of this type does not work)
154 block_plugin_fs_get_key (void *cls, enum GNUNET_BLOCK_Type type,
155 const void *block, size_t block_size,
156 struct GNUNET_HashCode *key)
158 const struct UBlock *ub;
162 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
163 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
164 GNUNET_CRYPTO_hash (block, block_size, key);
166 case GNUNET_BLOCK_TYPE_FS_UBLOCK:
167 if (block_size < sizeof (struct UBlock))
170 return GNUNET_SYSERR;
173 GNUNET_CRYPTO_hash (&ub->verification_key,
174 sizeof (ub->verification_key),
179 return GNUNET_SYSERR;
185 * Entry point for the plugin.
188 libgnunet_plugin_block_fs_init (void *cls)
190 static enum GNUNET_BLOCK_Type types[] =
192 GNUNET_BLOCK_TYPE_FS_DBLOCK,
193 GNUNET_BLOCK_TYPE_FS_IBLOCK,
194 GNUNET_BLOCK_TYPE_FS_UBLOCK,
195 GNUNET_BLOCK_TYPE_ANY /* end of list */
197 struct GNUNET_BLOCK_PluginFunctions *api;
199 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
200 api->evaluate = &block_plugin_fs_evaluate;
201 api->get_key = &block_plugin_fs_get_key;
208 * Exit point from the plugin.
211 libgnunet_plugin_block_fs_done (void *cls)
213 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
219 /* end of plugin_block_fs.c */