2 This file is part of GNUnet
3 (C) 2010 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 "block_gns.h"
31 #include "gnunet_signatures.h"
34 * Number of bits we set per entry in the bloomfilter.
35 * Do not change! -from fs
37 #define BLOOMFILTER_K 16
40 #define GNUNET_BLOCK_TYPE_GNS_NAMERECORD 11
43 * Function called to validate a reply or a request. For
44 * request evaluation, simply pass "NULL" for the reply_block.
45 * Note that it is assumed that the reply has already been
46 * matched to the key (and signatures checked) as it would
47 * be done with the "get_key" function.
50 * @param type block type
51 * @param query original query (hash)
52 * @param bf pointer to bloom filter associated with query; possibly updated (!)
53 * @param bf_mutator mutation value for bf
54 * @param xquery extrended query data (can be NULL, depending on type)
55 * @param xquery_size number of bytes in xquery
56 * @param reply_block response to validate
57 * @param reply_block_size number of bytes in reply block
58 * @return characterization of result
60 static enum GNUNET_BLOCK_EvaluationResult
61 block_plugin_gns_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
62 const GNUNET_HashCode * query,
63 struct GNUNET_CONTAINER_BloomFilter **bf,
64 int32_t bf_mutator, const void *xquery,
65 size_t xquery_size, const void *reply_block,
66 size_t reply_block_size)
68 if (type != GNUNET_BLOCK_TYPE_GNS_NAMERECORD)
69 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
72 GNUNET_HashCode pkey_hash;
73 GNUNET_HashCode query_pkey;
74 GNUNET_HashCode name_hash;
75 GNUNET_HashCode mhash;
76 GNUNET_HashCode chash;
77 struct GNSNameRecordBlock *nrb;
78 struct GNSRecordBlock *rb;
81 nrb = (struct GNSNameRecordBlock *)reply_block;
83 name = (char*)&nrb[1];
85 GNUNET_CRYPTO_hash(&nrb->public_key,
86 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
89 GNUNET_CRYPTO_hash(name, strlen(name), &name_hash);
91 GNUNET_CRYPTO_hash_xor(query, &name_hash, &query_pkey);
93 //Check query key against public key
94 if (0 != GNUNET_CRYPTO_hash_cmp(&query_pkey, &pkey_hash))
95 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
97 rd_count = ntohl(nrb->rd_count);
99 struct GNUNET_NAMESTORE_RecordData rd[rd_count];
101 int record_match = 0;
102 rb = (struct GNSRecordBlock*)(&nrb[1] + strlen(name) + 1);
104 for (i=0; i<rd_count; i++)
106 rd[i].record_type = ntohl(rb->type);
108 GNUNET_TIME_absolute_ntoh(rb->expiration);
109 rd[i].data_size = ntohl(rb->data_length);
110 rd[i].flags = ntohl(rb->flags);
111 rd[i].data = (char*)&rb[1];
112 rb = &rb[1] + rd[i].data_size;
113 if (xquery_size > 0 && (rd[i].record_type == *((uint32_t*)xquery)))
117 //No record matches query
118 if (xquery_size > 0 && (record_match == 0))
119 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
121 if (GNUNET_OK != GNUNET_NAMESTORE_verify_signature (&nrb->public_key,
127 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Signature invalid\n");
128 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
131 //FIXME do bf check before or after crypto??
134 GNUNET_CRYPTO_hash(reply_block, reply_block_size, &chash);
135 GNUNET_BLOCK_mingle_hash(&chash, bf_mutator, &mhash);
138 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test(*bf, &mhash))
139 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
143 *bf = GNUNET_CONTAINER_bloomfilter_init(NULL, 8, BLOOMFILTER_K);
145 GNUNET_CONTAINER_bloomfilter_add(*bf, &mhash);
148 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
153 * Function called to obtain the key for a block.
156 * @param type block type
157 * @param block block to get the key for
158 * @param block_size number of bytes in block
159 * @param key set to the key (query) for the given block
160 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
161 * (or if extracting a key from a block of this type does not work)
164 block_plugin_gns_get_key (void *cls, enum GNUNET_BLOCK_Type type,
165 const void *block, size_t block_size,
166 GNUNET_HashCode * key)
168 if (type != GNUNET_BLOCK_TYPE_GNS_NAMERECORD)
170 GNUNET_HashCode name_hash;
171 GNUNET_HashCode pkey_hash;
172 struct GNSNameRecordBlock *nrb = (struct GNSNameRecordBlock *)block;
174 GNUNET_CRYPTO_hash(&nrb[1], strlen((char*)&nrb[1]), &name_hash);
175 GNUNET_CRYPTO_hash(&nrb->public_key,
176 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
179 GNUNET_CRYPTO_hash_xor(&name_hash, &pkey_hash, key);
181 //FIXME calculate key from name and hash(pkey) here
187 * Entry point for the plugin.
190 libgnunet_plugin_block_gns_init (void *cls)
192 static enum GNUNET_BLOCK_Type types[] =
194 GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
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_gns_evaluate;
201 api->get_key = &block_plugin_gns_get_key;
208 * Exit point from the plugin.
211 libgnunet_plugin_block_gns_done (void *cls)
213 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
219 /* end of plugin_block_gns.c */