2 This file is part of GNUnet
3 Copyright (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 gns/plugin_block_gns.c
23 * @brief blocks used for GNS records
24 * @author Martin Schanzenbach
28 #include "gnunet_block_plugin.h"
29 #include "gnunet_namestore_service.h"
30 #include "gnunet_signatures.h"
33 * Number of bits we set per entry in the bloomfilter.
34 * Do not change! -from fs
36 #define BLOOMFILTER_K 16
39 * Function called to validate a reply or a request. For
40 * request evaluation, simply pass "NULL" for the reply_block.
41 * Note that it is assumed that the reply has already been
42 * matched to the key (and signatures checked) as it would
43 * be done with the "get_key" function.
46 * @param type block type
47 * @param query original query (hash)
48 * @param bf pointer to bloom filter associated with @a query; possibly updated (!)
49 * @param bf_mutator mutation value for @a bf
50 * @param xquery extrended query data (can be NULL, depending on @a type)
51 * @param xquery_size number of bytes in @a xquery
52 * @param reply_block response to validate
53 * @param reply_block_size number of bytes in @a reply_block
54 * @return characterization of result
56 static enum GNUNET_BLOCK_EvaluationResult
57 block_plugin_gns_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
58 const struct GNUNET_HashCode *query,
59 struct GNUNET_CONTAINER_BloomFilter **bf,
60 int32_t bf_mutator, const void *xquery,
61 size_t xquery_size, const void *reply_block,
62 size_t reply_block_size)
64 const struct GNUNET_GNSRECORD_Block *block;
65 struct GNUNET_HashCode h;
66 struct GNUNET_HashCode chash;
67 struct GNUNET_HashCode mhash;
69 if (type != GNUNET_BLOCK_TYPE_GNS_NAMERECORD)
70 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
71 if (NULL == reply_block)
76 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
78 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
82 if (reply_block_size < sizeof (struct GNUNET_GNSRECORD_Block))
85 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
88 if (ntohl (block->purpose.size) + sizeof (struct GNUNET_CRYPTO_EcdsaSignature) + sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) !=
92 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
94 GNUNET_CRYPTO_hash (&block->derived_key,
95 sizeof (block->derived_key),
97 if (0 != memcmp (&h, query, sizeof (struct GNUNET_HashCode)))
100 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
103 GNUNET_GNSRECORD_block_verify (block))
106 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
110 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
111 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
114 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test(*bf, &mhash))
115 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
119 *bf = GNUNET_CONTAINER_bloomfilter_init(NULL, 8, BLOOMFILTER_K);
121 GNUNET_CONTAINER_bloomfilter_add(*bf, &mhash);
123 return GNUNET_BLOCK_EVALUATION_OK_MORE;
128 * Function called to obtain the key for a block.
131 * @param type block type
132 * @param reply_block block to get the key for
133 * @param reply_block_size number of bytes in @a reply_block
134 * @param key set to the key (query) for the given block
135 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
136 * (or if extracting a key from a block of this type does not work)
139 block_plugin_gns_get_key (void *cls, enum GNUNET_BLOCK_Type type,
140 const void *reply_block, size_t reply_block_size,
141 struct GNUNET_HashCode *key)
143 const struct GNUNET_GNSRECORD_Block *block;
145 if (type != GNUNET_BLOCK_TYPE_GNS_NAMERECORD)
146 return GNUNET_SYSERR;
147 if (reply_block_size < sizeof (struct GNUNET_GNSRECORD_Block))
150 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
153 GNUNET_CRYPTO_hash (&block->derived_key,
154 sizeof (block->derived_key),
161 * Entry point for the plugin.
164 libgnunet_plugin_block_gns_init (void *cls)
166 static enum GNUNET_BLOCK_Type types[] =
168 GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
169 GNUNET_BLOCK_TYPE_ANY /* end of list */
171 struct GNUNET_BLOCK_PluginFunctions *api;
173 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
174 api->evaluate = &block_plugin_gns_evaluate;
175 api->get_key = &block_plugin_gns_get_key;
182 * Exit point from the plugin.
185 libgnunet_plugin_block_gns_done (void *cls)
187 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
193 /* end of plugin_block_gns.c */