2 This file is part of GNUnet
3 (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 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 2, 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/fs_namespace.c
23 * @brief create and destroy namespaces
24 * @author Christian Grothoff
27 #include "gnunet_constants.h"
28 #include "gnunet_signatures.h"
29 #include "gnunet_util_lib.h"
30 #include "gnunet_fs_service.h"
34 * Return the name of the directory in which we store
35 * our local namespaces (or rather, their public keys).
37 * @param h global fs handle
38 * @return NULL on error, otherwise the name of the directory
41 get_namespace_directory (struct GNUNET_FS_Handle *h)
46 GNUNET_CONFIGURATION_get_value_filename (h->cfg,
51 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
52 _("Configuration fails to specify `%s' in section `%s'\n"),
62 * Context for advertising a namespace.
64 struct AdvertisementContext
67 * Function to call with the result.
69 GNUNET_FS_PublishContinuation cont;
79 struct GNUNET_DATASTORE_Handle *dsh;
84 struct GNUNET_FS_Uri *ksk_uri;
92 * NBlock to sign and store.
99 struct GNUNET_FS_Namespace *ns;
104 struct GNUNET_TIME_Absolute expiration;
107 * Number of bytes of plaintext.
122 * Current keyword offset.
129 * Continuation called to notify client about result of the
132 * @param cls closure (our struct AdvertismentContext)
133 * @param success GNUNET_SYSERR on failure
134 * @param msg NULL on success, otherwise an error message
137 advertisement_cont (void *cls,
141 struct AdvertisementContext *ac = cls;
144 GNUNET_HashCode query;
145 struct GNUNET_CRYPTO_AesSessionKey skey;
146 struct GNUNET_CRYPTO_AesInitializationVector iv;
147 struct GNUNET_CRYPTO_RsaPrivateKey *pk;
149 if (GNUNET_OK != success)
152 GNUNET_DATASTORE_disconnect (ac->dsh, GNUNET_NO);
153 ac->cont (ac->cont_cls, NULL, msg);
154 GNUNET_FS_uri_destroy (ac->ksk_uri);
155 GNUNET_free (ac->pt);
156 GNUNET_free (ac->nb);
157 GNUNET_FS_namespace_delete (ac->ns, GNUNET_NO);
161 if (ac->pos == ac->ksk_uri->data.ksk.keywordCount)
164 GNUNET_DATASTORE_disconnect (ac->dsh, GNUNET_NO);
165 ac->cont (ac->cont_cls, ac->ksk_uri, NULL);
166 GNUNET_FS_uri_destroy (ac->ksk_uri);
167 GNUNET_free (ac->pt);
168 GNUNET_free (ac->nb);
169 GNUNET_FS_namespace_delete (ac->ns, GNUNET_NO);
173 keyword = ac->ksk_uri->data.ksk.keywords[ac->pos++];
174 /* first character of keyword indicates if it is
175 mandatory or not -- ignore for hashing */
176 GNUNET_CRYPTO_hash (&keyword[1], strlen (&keyword[1]), &key);
177 GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
178 GNUNET_CRYPTO_aes_encrypt (ac->pt,
183 GNUNET_break (GNUNET_OK ==
184 GNUNET_CRYPTO_rsa_sign (ac->ns->key,
186 &ac->nb->ns_signature));
187 pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&key);
188 GNUNET_CRYPTO_rsa_key_get_public (pk, &ac->nb->keyspace);
189 GNUNET_CRYPTO_hash (&ac->nb->keyspace,
190 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
192 GNUNET_break (GNUNET_OK ==
193 GNUNET_CRYPTO_rsa_sign (pk,
194 &ac->nb->ksk_purpose,
195 &ac->nb->ksk_signature));
196 GNUNET_CRYPTO_rsa_key_free (pk);
197 GNUNET_DATASTORE_put (ac->dsh,
198 0 /* no reservation */,
200 ac->pt_size + sizeof (struct NBlock),
202 GNUNET_BLOCK_TYPE_NBLOCK,
207 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
214 * Publish an advertismement for a namespace.
216 * @param h handle to the file sharing subsystem
217 * @param ksk_uri keywords to use for advertisment
218 * @param namespace handle for the namespace that should be advertised
219 * @param meta meta-data for the namespace advertisement
220 * @param anonymity for the namespace advertismement
221 * @param priority for the namespace advertisement
222 * @param expiration for the namespace advertisement
223 * @param rootEntry name of the root of the namespace
224 * @param cont continuation
225 * @param cont_cls closure for cont
228 GNUNET_FS_namespace_advertise (struct GNUNET_FS_Handle *h,
229 struct GNUNET_FS_Uri *ksk_uri,
230 struct GNUNET_FS_Namespace *namespace,
231 const struct GNUNET_CONTAINER_MetaData *meta,
234 struct GNUNET_TIME_Absolute expiration,
235 const char *rootEntry,
236 GNUNET_FS_PublishContinuation cont,
244 struct GNUNET_DATASTORE_Handle *dsh;
245 struct AdvertisementContext *ctx;
248 /* create advertisements */
249 mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta);
252 cont (cont_cls, NULL, _("Failed to serialize meta data"));
255 reslen = strlen (rootEntry) + 1;
256 size = mdsize + sizeof (struct NBlock) + reslen;
257 if (size > MAX_NBLOCK_SIZE)
259 size = MAX_NBLOCK_SIZE;
260 mdsize = size - sizeof (struct NBlock) - reslen;
263 pt = GNUNET_malloc (mdsize + reslen);
264 memcpy (pt, rootEntry, reslen);
266 mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
269 GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
274 cont (cont_cls, NULL, _("Failed to serialize meta data"));
277 size = mdsize + sizeof (struct NBlock) + reslen;
278 nb = GNUNET_malloc (size);
279 GNUNET_CRYPTO_rsa_key_get_public (namespace->key,
281 nb->ns_purpose.size = htonl (mdsize + reslen +
282 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
283 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
284 nb->ns_purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_NBLOCK);
285 nb->ksk_purpose.size = htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
286 nb->ksk_purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_NBLOCK_KSIG);
287 dsh = GNUNET_DATASTORE_connect (h->cfg, h->sched);
292 cont (cont_cls, NULL, _("Failed to connect to datastore service"));
295 ctx = GNUNET_malloc (sizeof (struct AdvertisementContext));
297 ctx->cont_cls = cont_cls;
299 ctx->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
302 ctx->pt_size = mdsize + reslen;
305 ctx->anonymity = anonymity;
306 ctx->priority = priority;
307 ctx->expiration = expiration;
308 advertisement_cont (ctx, GNUNET_OK, NULL);
313 * Create a namespace with the given name; if one already
314 * exists, return a handle to the existing namespace.
316 * @param h handle to the file sharing subsystem
317 * @param name name to use for the namespace
318 * @return handle to the namespace, NULL on error
320 struct GNUNET_FS_Namespace *
321 GNUNET_FS_namespace_create (struct GNUNET_FS_Handle *h,
326 struct GNUNET_FS_Namespace *ret;
328 dn = get_namespace_directory (h);
329 GNUNET_asprintf (&fn,
335 ret = GNUNET_malloc (sizeof (struct GNUNET_FS_Namespace));
337 ret->key = GNUNET_CRYPTO_rsa_key_create_from_file (fn);
338 if (ret->key == NULL)
340 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
341 _("Failed to create or read private key for namespace `%s'\n"),
347 ret->name = GNUNET_strdup (name);
354 * Delete a namespace handle. Can be used for a clean shutdown (free
355 * memory) or also to freeze the namespace to prevent further
356 * insertions by anyone.
358 * @param namespace handle to the namespace that should be deleted / freed
359 * @param freeze prevents future insertions; creating a namespace
360 * with the same name again will create a fresh namespace instead
362 * @return GNUNET_OK on success, GNUNET_SYSERR on error
365 GNUNET_FS_namespace_delete (struct GNUNET_FS_Namespace *namespace,
371 if (0 != UNLINK (namespace->filename))
372 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
374 namespace->filename);
376 if (0 == namespace->rc)
378 GNUNET_CRYPTO_rsa_key_free (namespace->key);
379 GNUNET_free (namespace->filename);
380 GNUNET_free (namespace->name);
381 GNUNET_free (namespace);
388 * Context for the 'process_namespace' callback.
389 * Specifies a function to call on each namespace.
391 struct ProcessNamespaceContext
396 GNUNET_FS_NamespaceInfoProcessor cb;
406 * Function called with a filename of a namespace. Reads the key and
407 * calls the callback.
409 * @param cls closure (struct ProcessNamespaceContext)
410 * @param filename complete filename (absolute path)
411 * @return GNUNET_OK to continue to iterate,
412 * GNUNET_SYSERR to abort iteration with error!
415 process_namespace (void *cls,
416 const char *filename)
418 struct ProcessNamespaceContext *pnc = cls;
419 struct GNUNET_CRYPTO_RsaPrivateKey *key;
420 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
425 key = GNUNET_CRYPTO_rsa_key_create_from_file (filename);
428 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
429 _("Failed to read namespace private key file `%s', deleting it!\n"),
431 if (0 != UNLINK (filename))
432 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
437 GNUNET_CRYPTO_rsa_key_get_public (key, &pk);
438 GNUNET_CRYPTO_rsa_key_free (key);
439 GNUNET_CRYPTO_hash (&pk, sizeof(pk), &id);
441 while (NULL != (t = strstr (name, DIR_SEPARATOR_STR)))
443 pnc->cb (pnc->cb_cls,
451 * Build a list of all available local (!) namespaces The returned
452 * names are only the nicknames since we only iterate over the local
455 * @param h handle to the file sharing subsystem
456 * @param cb function to call on each known namespace
457 * @param cb_cls closure for cb
460 GNUNET_FS_namespace_list (struct GNUNET_FS_Handle *h,
461 GNUNET_FS_NamespaceInfoProcessor cb,
465 struct ProcessNamespaceContext ctx;
467 dn = get_namespace_directory (h);
472 GNUNET_DISK_directory_scan (dn,
478 /* end of fs_namespace.c */