2 * This file is part of GNUnet
3 * Copyright (C) 2009-2015 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., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
22 * @file namecache/plugin_namecache_flat.c
23 * @brief flat file-based namecache backend
24 * @author Martin Schanzenbach
28 #include "gnunet_namecache_plugin.h"
29 #include "gnunet_namecache_service.h"
30 #include "gnunet_gnsrecord_lib.h"
31 #include "namecache.h"
34 * Context for all functions in this plugin.
39 const struct GNUNET_CONFIGURATION_Handle *cfg;
49 struct GNUNET_CONTAINER_MultiHashMap *hm;
58 struct GNUNET_GNSRECORD_Block *block;
63 struct GNUNET_HashCode query;
68 * Initialize the database connections and associated
69 * data structures (create tables and indices
72 * @param plugin the plugin context (state for this module)
73 * @return #GNUNET_OK on success
76 database_setup (struct Plugin *plugin)
85 struct FlatFileEntry *entry;
86 struct GNUNET_DISK_FileHandle *fh;
89 GNUNET_CONFIGURATION_get_value_filename (plugin->cfg, "namecache-flat",
92 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
93 "namecache-flat", "FILENAME");
96 if (GNUNET_OK != GNUNET_DISK_file_test (afsdir))
98 if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (afsdir))
101 GNUNET_free (afsdir);
102 return GNUNET_SYSERR;
105 /* afsdir should be UTF-8-encoded. If it isn't, it's a bug */
108 /* Load data from file into hashmap */
109 plugin->hm = GNUNET_CONTAINER_multihashmap_create (10,
111 fh = GNUNET_DISK_file_open (afsdir,
112 GNUNET_DISK_OPEN_CREATE |
113 GNUNET_DISK_OPEN_READWRITE,
114 GNUNET_DISK_PERM_USER_WRITE |
115 GNUNET_DISK_PERM_USER_READ);
118 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
119 _("Unable to initialize file: %s.\n"),
121 return GNUNET_SYSERR;
124 if (GNUNET_SYSERR == GNUNET_DISK_file_size (afsdir,
129 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
130 _("Unable to get filesize: %s.\n"),
132 return GNUNET_SYSERR;
138 buffer = GNUNET_malloc (size);
140 if (GNUNET_SYSERR == GNUNET_DISK_file_read (fh,
144 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
145 _("Unable to read file: %s.\n"),
147 return GNUNET_SYSERR;
150 GNUNET_DISK_file_close (fh);
152 line = strtok ("\n", buffer);
153 while (line != NULL) {
154 query = strtok (",", line);
155 block = strtok (NULL, line);
156 line = strtok ("\n", buffer);
157 entry = GNUNET_malloc (sizeof (struct FlatFileEntry));
158 GNUNET_CRYPTO_hash_from_string (query,
160 GNUNET_STRINGS_base64_decode (block,
163 entry->block = (struct GNUNET_GNSRECORD_Block *) block_buffer;
165 GNUNET_CONTAINER_multihashmap_put (plugin->hm,
168 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
174 GNUNET_free (buffer);
179 * Store values in hashmap in file and free data
181 * @param plugin the plugin context
184 store_and_free_entries (void *cls,
185 const struct GNUNET_HashCode *key,
188 struct GNUNET_DISK_FileHandle *fh = cls;
189 struct FlatFileEntry *entry = value;
193 struct GNUNET_CRYPTO_HashAsciiEncoded query;
196 block_size = ntohl (entry->block->purpose.size) +
197 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) +
198 sizeof (struct GNUNET_CRYPTO_EcdsaSignature);
200 GNUNET_STRINGS_base64_encode ((char*)entry->block,
203 GNUNET_CRYPTO_hash_to_enc (&entry->query,
205 GNUNET_asprintf (&line,
210 GNUNET_free (block_b64);
212 GNUNET_DISK_file_write (fh,
216 GNUNET_free (entry->block);
222 * Shutdown database connection and associate data
224 * @param plugin the plugin context (state for this module)
227 database_shutdown (struct Plugin *plugin)
229 struct GNUNET_DISK_FileHandle *fh;
230 fh = GNUNET_DISK_file_open (plugin->fn,
231 GNUNET_DISK_OPEN_CREATE |
232 GNUNET_DISK_OPEN_TRUNCATE |
233 GNUNET_DISK_OPEN_READWRITE,
234 GNUNET_DISK_PERM_USER_WRITE |
235 GNUNET_DISK_PERM_USER_READ);
238 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
239 _("Unable to initialize file: %s.\n"),
244 GNUNET_CONTAINER_multihashmap_iterate (plugin->hm,
245 &store_and_free_entries,
247 GNUNET_CONTAINER_multihashmap_destroy (plugin->hm);
248 GNUNET_DISK_file_close (fh);
253 expire_blocks (void *cls,
254 const struct GNUNET_HashCode *key,
257 struct Plugin *plugin = cls;
258 struct FlatFileEntry *entry = value;
259 struct GNUNET_TIME_Absolute now;
260 struct GNUNET_TIME_Absolute expiration;
262 now = GNUNET_TIME_absolute_get ();
263 expiration = GNUNET_TIME_absolute_ntoh (entry->block->expiration_time);
265 if (0 == GNUNET_TIME_absolute_get_difference (now,
266 expiration).rel_value_us)
268 GNUNET_CONTAINER_multihashmap_remove_all (plugin->hm, key);
276 * Removes any expired block.
278 * @param plugin the plugin
281 namecache_expire_blocks (struct Plugin *plugin)
283 GNUNET_CONTAINER_multihashmap_iterate (plugin->hm,
290 * Cache a block in the datastore.
292 * @param cls closure (internal context for the plugin)
293 * @param block block to cache
294 * @return #GNUNET_OK on success, else #GNUNET_SYSERR
297 namecache_cache_block (void *cls,
298 const struct GNUNET_GNSRECORD_Block *block)
300 struct Plugin *plugin = cls;
301 struct GNUNET_HashCode query;
302 struct FlatFileEntry *entry;
305 namecache_expire_blocks (plugin);
306 GNUNET_CRYPTO_hash (&block->derived_key,
307 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
309 block_size = ntohl (block->purpose.size) +
310 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) +
311 sizeof (struct GNUNET_CRYPTO_EcdsaSignature);
312 if (block_size > 64 * 65536)
315 return GNUNET_SYSERR;
317 entry = GNUNET_malloc (sizeof (struct FlatFileEntry));
318 entry->block = GNUNET_malloc (block_size);
319 memcpy (entry->block, block, block_size);
320 GNUNET_CONTAINER_multihashmap_remove_all (plugin->hm, &query);
322 GNUNET_CONTAINER_multihashmap_put (plugin->hm,
325 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
329 return GNUNET_SYSERR;
331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
332 "Caching block under derived key `%s'\n",
333 GNUNET_h2s_full (&query));
339 * Get the block for a particular zone and label in the
340 * datastore. Will return at most one result to the iterator.
342 * @param cls closure (internal context for the plugin)
343 * @param query hash of public key derived from the zone and the label
344 * @param iter function to call with the result
345 * @param iter_cls closure for @a iter
346 * @return #GNUNET_OK on success, #GNUNET_NO if there were no results, #GNUNET_SYSERR on error
349 namecache_lookup_block (void *cls,
350 const struct GNUNET_HashCode *query,
351 GNUNET_NAMECACHE_BlockCallback iter, void *iter_cls)
353 struct Plugin *plugin = cls;
354 const struct GNUNET_GNSRECORD_Block *block;
356 block = GNUNET_CONTAINER_multihashmap_get (plugin->hm, query);
359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
360 "Found block under derived key `%s'\n",
361 GNUNET_h2s_full (query));
362 iter (iter_cls, block);
368 * Entry point for the plugin.
370 * @param cls the "struct GNUNET_NAMECACHE_PluginEnvironment*"
371 * @return NULL on error, otherwise the plugin context
374 libgnunet_plugin_namecache_flat_init (void *cls)
376 static struct Plugin plugin;
377 const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
378 struct GNUNET_NAMECACHE_PluginFunctions *api;
380 if (NULL != plugin.cfg)
381 return NULL; /* can only initialize once! */
382 memset (&plugin, 0, sizeof (struct Plugin));
384 if (GNUNET_OK != database_setup (&plugin))
386 database_shutdown (&plugin);
389 api = GNUNET_new (struct GNUNET_NAMECACHE_PluginFunctions);
391 api->cache_block = &namecache_cache_block;
392 api->lookup_block = &namecache_lookup_block;
393 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
394 _("flat plugin running\n"));
400 * Exit point from the plugin.
402 * @param cls the plugin context (as returned by "init")
403 * @return always NULL
406 libgnunet_plugin_namecache_flat_done (void *cls)
408 struct GNUNET_NAMECACHE_PluginFunctions *api = cls;
409 struct Plugin *plugin = api->cls;
411 database_shutdown (plugin);
414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
415 "flat plugin is finished\n");
419 /* end of plugin_namecache_sqlite.c */