aboutsummaryrefslogtreecommitdiff
path: root/src/fs/plugin_block_fs.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/fs/plugin_block_fs.c')
-rw-r--r--src/fs/plugin_block_fs.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/src/fs/plugin_block_fs.c b/src/fs/plugin_block_fs.c
new file mode 100644
index 000000000..c1b4ad7c8
--- /dev/null
+++ b/src/fs/plugin_block_fs.c
@@ -0,0 +1,322 @@
1/*
2 This file is part of GNUnet
3 (C) 2010 Christian Grothoff (and other contributing authors)
4
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.
9
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.
14
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.
19*/
20
21/**
22 * @file block/plugin_block_fs.c
23 * @brief blocks used for file-sharing
24 * @author Christian Grothoff
25 */
26
27#include "platform.h"
28#include "gnunet_block_plugin.h"
29#include "block_fs.h"
30#include "gnunet_signatures.h"
31
32#define DEBUG_FS_BLOCK GNUNET_EXTRA_LOGGING
33
34/**
35 * Number of bits we set per entry in the bloomfilter.
36 * Do not change!
37 */
38#define BLOOMFILTER_K 16
39
40/**
41 * Function called to validate a reply or a request. For
42 * request evaluation, simply pass "NULL" for the reply_block.
43 * Note that it is assumed that the reply has already been
44 * matched to the key (and signatures checked) as it would
45 * be done with the "get_key" function.
46 *
47 * @param cls closure
48 * @param type block type
49 * @param query original query (hash)
50 * @param bf pointer to bloom filter associated with query; possibly updated (!)
51 * @param bf_mutator mutation value for bf
52 * @param xquery extrended query data (can be NULL, depending on type)
53 * @param xquery_size number of bytes in xquery
54 * @param reply_block response to validate
55 * @param reply_block_size number of bytes in reply block
56 * @return characterization of result
57 */
58static enum GNUNET_BLOCK_EvaluationResult
59block_plugin_fs_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
60 const GNUNET_HashCode * query,
61 struct GNUNET_CONTAINER_BloomFilter **bf,
62 int32_t bf_mutator, const void *xquery,
63 size_t xquery_size, const void *reply_block,
64 size_t reply_block_size)
65{
66 const struct SBlock *sb;
67 GNUNET_HashCode chash;
68 GNUNET_HashCode mhash;
69 const GNUNET_HashCode *nsid;
70 GNUNET_HashCode sh;
71
72 switch (type)
73 {
74 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
75 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
76 if (xquery_size != 0)
77 {
78 GNUNET_break_op (0);
79 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
80 }
81 if (reply_block == NULL)
82 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
83 return GNUNET_BLOCK_EVALUATION_OK_LAST;
84 case GNUNET_BLOCK_TYPE_FS_KBLOCK:
85 case GNUNET_BLOCK_TYPE_FS_NBLOCK:
86 if (xquery_size != 0)
87 {
88 GNUNET_break_op (0);
89 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
90 }
91 if (reply_block == NULL)
92 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
93 if (NULL != bf)
94 {
95 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
96 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
97 if (NULL != *bf)
98 {
99 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
100 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
101 }
102 else
103 {
104 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
105 }
106 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
107 }
108 return GNUNET_BLOCK_EVALUATION_OK_MORE;
109 case GNUNET_BLOCK_TYPE_FS_SBLOCK:
110 if (xquery_size != sizeof (GNUNET_HashCode))
111 {
112 GNUNET_break_op (0);
113 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
114 }
115 if (reply_block == NULL)
116 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
117 nsid = xquery;
118 if (reply_block_size < sizeof (struct SBlock))
119 {
120 GNUNET_break_op (0);
121 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
122 }
123 sb = reply_block;
124 GNUNET_CRYPTO_hash (&sb->subspace,
125 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
126 &sh);
127 if (0 != memcmp (nsid, &sh, sizeof (GNUNET_HashCode)))
128 {
129 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "block-fs",
130 _
131 ("Reply mismatched in terms of namespace. Discarded.\n"));
132 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
133 }
134 if (NULL != bf)
135 {
136 GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
137 GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
138 if (NULL != *bf)
139 {
140 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
141 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
142 }
143 else
144 {
145 *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
146 }
147 GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
148 }
149 return GNUNET_BLOCK_EVALUATION_OK_MORE;
150 default:
151 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
152 }
153}
154
155
156/**
157 * Function called to obtain the key for a block.
158 *
159 * @param cls closure
160 * @param type block type
161 * @param block block to get the key for
162 * @param block_size number of bytes in block
163 * @param key set to the key (query) for the given block
164 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
165 * (or if extracting a key from a block of this type does not work)
166 */
167static int
168block_plugin_fs_get_key (void *cls, enum GNUNET_BLOCK_Type type,
169 const void *block, size_t block_size,
170 GNUNET_HashCode * key)
171{
172 const struct KBlock *kb;
173 const struct SBlock *sb;
174 const struct NBlock *nb;
175
176 switch (type)
177 {
178 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
179 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
180 GNUNET_CRYPTO_hash (block, block_size, key);
181 return GNUNET_OK;
182 case GNUNET_BLOCK_TYPE_FS_KBLOCK:
183 if (block_size < sizeof (struct KBlock))
184 {
185 GNUNET_break_op (0);
186 return GNUNET_NO;
187 }
188 kb = block;
189 if (block_size - sizeof (struct KBlock) !=
190 ntohl (kb->purpose.size) -
191 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) -
192 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded))
193 {
194 GNUNET_break_op (0);
195 return GNUNET_NO;
196 }
197 if (GNUNET_OK !=
198 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_FS_KBLOCK,
199 &kb->purpose, &kb->signature, &kb->keyspace))
200 {
201 GNUNET_break_op (0);
202 return GNUNET_NO;
203 }
204 if (key != NULL)
205 GNUNET_CRYPTO_hash (&kb->keyspace,
206 sizeof (struct
207 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
208 key);
209 return GNUNET_OK;
210 case GNUNET_BLOCK_TYPE_FS_SBLOCK:
211 if (block_size < sizeof (struct SBlock))
212 {
213 GNUNET_break_op (0);
214 return GNUNET_NO;
215 }
216 sb = block;
217 if (block_size !=
218 ntohl (sb->purpose.size) + sizeof (struct GNUNET_CRYPTO_RsaSignature))
219 {
220 GNUNET_break_op (0);
221 return GNUNET_NO;
222 }
223 if (GNUNET_OK !=
224 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_FS_SBLOCK,
225 &sb->purpose, &sb->signature, &sb->subspace))
226 {
227 GNUNET_break_op (0);
228 return GNUNET_NO;
229 }
230 if (key != NULL)
231 *key = sb->identifier;
232 return GNUNET_OK;
233 case GNUNET_BLOCK_TYPE_FS_NBLOCK:
234 if (block_size < sizeof (struct NBlock))
235 {
236 GNUNET_break_op (0);
237 return GNUNET_NO;
238 }
239 nb = block;
240 if (block_size - sizeof (struct NBlock) !=
241 ntohl (nb->ns_purpose.size) -
242 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) -
243 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded))
244 {
245 GNUNET_break_op (0);
246 return GNUNET_NO;
247 }
248 if (block_size !=
249 ntohl (nb->ksk_purpose.size) +
250 sizeof (struct GNUNET_CRYPTO_RsaSignature))
251 {
252 GNUNET_break_op (0);
253 return GNUNET_NO;
254 }
255 if (GNUNET_OK !=
256 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_FS_NBLOCK_KSIG,
257 &nb->ksk_purpose, &nb->ksk_signature,
258 &nb->keyspace))
259 {
260 GNUNET_break_op (0);
261 return GNUNET_NO;
262 }
263 if (GNUNET_OK !=
264 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_FS_NBLOCK,
265 &nb->ns_purpose, &nb->ns_signature,
266 &nb->subspace))
267 {
268 GNUNET_break_op (0);
269 return GNUNET_NO;
270 }
271 /* FIXME: we used to xor ID with NSID,
272 * why not here? */
273 if (key != NULL)
274 GNUNET_CRYPTO_hash (&nb->keyspace,
275 sizeof (struct
276 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
277 key);
278 return GNUNET_OK;
279 default:
280 return GNUNET_SYSERR;
281 }
282}
283
284
285/**
286 * Entry point for the plugin.
287 */
288void *
289libgnunet_plugin_block_fs_init (void *cls)
290{
291 static enum GNUNET_BLOCK_Type types[] =
292 {
293 GNUNET_BLOCK_TYPE_FS_DBLOCK,
294 GNUNET_BLOCK_TYPE_FS_IBLOCK,
295 GNUNET_BLOCK_TYPE_FS_KBLOCK,
296 GNUNET_BLOCK_TYPE_FS_SBLOCK,
297 GNUNET_BLOCK_TYPE_FS_NBLOCK,
298 GNUNET_BLOCK_TYPE_ANY /* end of list */
299 };
300 struct GNUNET_BLOCK_PluginFunctions *api;
301
302 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
303 api->evaluate = &block_plugin_fs_evaluate;
304 api->get_key = &block_plugin_fs_get_key;
305 api->types = types;
306 return api;
307}
308
309
310/**
311 * Exit point from the plugin.
312 */
313void *
314libgnunet_plugin_block_fs_done (void *cls)
315{
316 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
317
318 GNUNET_free (api);
319 return NULL;
320}
321
322/* end of plugin_block_fs.c */