2 This file is part of GNUnet.
3 (C) 2009 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 namestore/gnunet-service-namestore.c
23 * @brief namestore for the GNUnet naming system
24 * @author Matthias Wachs
27 #include "gnunet_getopt_lib.h"
28 #include "gnunet_service_lib.h"
29 #include "gnunet_namestore_service.h"
30 #include "gnunet_namestore_plugin.h"
31 #include "namestore.h"
36 * A namestore operation.
38 struct GNUNET_NAMESTORE_Operation
40 struct GNUNET_NAMESTORE_Operation *next;
41 struct GNUNET_NAMESTORE_Operation *prev;
45 char *data; /*stub data pointer*/
52 struct GNUNET_NAMESTORE_Client
54 struct GNUNET_NAMESTORE_Client *next;
55 struct GNUNET_NAMESTORE_Client *prev;
57 struct GNUNET_SERVER_Client * client;
59 struct GNUNET_NAMESTORE_Operation *op_head;
60 struct GNUNET_NAMESTORE_Operation *op_tail;
66 * Configuration handle.
68 const struct GNUNET_CONFIGURATION_Handle *GSN_cfg;
70 static struct GNUNET_NAMESTORE_PluginFunctions *GSN_database;
73 * Our notification context.
75 static struct GNUNET_SERVER_NotificationContext *snc;
77 static char *db_lib_name;
79 static struct GNUNET_NAMESTORE_Client *client_head;
80 static struct GNUNET_NAMESTORE_Client *client_tail;
84 * Task run during shutdown.
90 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
92 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Stopping namestore service\n");
94 struct GNUNET_NAMESTORE_Operation * no;
95 struct GNUNET_NAMESTORE_Client * nc;
96 struct GNUNET_NAMESTORE_Client * next;
98 for (nc = client_head; nc != NULL; nc = next)
101 for (no = nc->op_head; no != NULL; no = no->next)
103 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
107 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, nc);
112 GNUNET_SERVER_notification_context_destroy (snc);
115 GNUNET_break (NULL == GNUNET_PLUGIN_unload (db_lib_name, GSN_database));
116 GNUNET_free (db_lib_name);
119 static struct GNUNET_NAMESTORE_Client *
120 client_lookup (struct GNUNET_SERVER_Client *client)
122 struct GNUNET_NAMESTORE_Client * nc;
124 GNUNET_assert (NULL != client);
126 for (nc = client_head; nc != NULL; nc = nc->next)
128 if (client == nc->client)
136 * Called whenever a client is disconnected. Frees our
137 * resources associated with that client.
140 * @param client identification of the client
143 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
145 struct GNUNET_NAMESTORE_Operation * no;
146 struct GNUNET_NAMESTORE_Client * nc;
150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p disconnected \n", client);
152 nc = client_lookup (client);
154 if ((NULL == client) || (NULL == nc))
157 for (no = nc->op_head; no != NULL; no = no->next)
159 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
163 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, nc);
167 static void handle_start (void *cls,
168 struct GNUNET_SERVER_Client * client,
169 const struct GNUNET_MessageHeader * message)
171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", client);
173 struct GNUNET_NAMESTORE_Client * nc = GNUNET_malloc (sizeof (struct GNUNET_NAMESTORE_Client));
175 GNUNET_SERVER_notification_context_add (snc, client);
176 GNUNET_CONTAINER_DLL_insert(client_head, client_tail, nc);
178 GNUNET_SERVER_receive_done (client, GNUNET_OK);
181 struct LookupNameContext
183 struct GNUNET_NAMESTORE_Client *nc;
185 uint32_t record_type;
190 handle_lookup_name_it (void *cls,
191 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key,
192 struct GNUNET_TIME_Absolute expire,
194 unsigned int rd_count,
195 const struct GNUNET_NAMESTORE_RecordData *rd,
196 const struct GNUNET_CRYPTO_RsaSignature *signature)
199 struct LookupNameContext *lnc = cls;
200 struct LookupNameResponseMessage *lnr_msg;
202 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key_tmp;
203 struct GNUNET_NAMESTORE_RecordData * rd_tmp;
205 struct GNUNET_CRYPTO_RsaSignature *signature_tmp;
207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message\n", "NAMESTORE_LOOKUP_NAME_RESPONSE");
213 name_len = strlen(name) + 1;
215 int copied_elements = 0;
216 int contains_signature = 0;
219 /* count records to copy */
222 if (lnc->record_type != 0)
224 /* special record type needed */
225 for (c = 0; c < rd_count; c ++)
226 if (rd[c].record_type == lnc->record_type)
227 copied_elements++; /* found matching record */
230 copied_elements = rd_count;
233 if ((copied_elements == rd_count) && (signature != NULL))
234 contains_signature = GNUNET_YES;
236 r_size = sizeof (struct LookupNameResponseMessage) +
237 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
239 copied_elements * sizeof (struct GNUNET_NAMESTORE_RecordData) +
240 contains_signature * sizeof (struct GNUNET_CRYPTO_RsaSignature);
242 lnr_msg = GNUNET_malloc (r_size);
244 lnr_msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_NAMESTORE_LOOKUP_NAME_RESPONSE);
245 lnr_msg->header.size = ntohs (r_size);
246 lnr_msg->op_id = htonl (lnc->id);
247 lnr_msg->rc_count = htonl (copied_elements);
248 lnr_msg->name_len = htons (name_len);
249 lnr_msg->expire = GNUNET_TIME_absolute_hton(expire);
250 lnr_msg->contains_sig = htons (contains_signature);
253 zone_key_tmp = (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *) &lnr_msg[1];
254 name_tmp = (char *) &zone_key_tmp[1];
255 rd_tmp = (struct GNUNET_NAMESTORE_RecordData *) &name_tmp[name_len];
256 signature_tmp = (struct GNUNET_CRYPTO_RsaSignature *) &rd_tmp[copied_elements];
258 if (zone_key != NULL)
259 memcpy (zone_key_tmp, zone_key, sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
262 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded dummy;
263 memset (&dummy, '0', sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
264 memcpy (zone_key_tmp, &dummy, sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
266 memcpy (name_tmp, name, name_len);
271 if (lnc->record_type != 0)
273 /* special record type needed */
274 for (c = 0; c < rd_count; c ++)
275 if (rd[c].record_type == lnc->record_type)
277 /* found matching record */
278 memcpy (&rd_tmp[copied_elements], &rd[c], rd_count * sizeof (struct GNUNET_NAMESTORE_RecordData));
283 memcpy (rd_tmp, rd, rd_count * sizeof (struct GNUNET_NAMESTORE_RecordData));
286 if (GNUNET_YES == contains_signature)
287 memcpy (signature_tmp, signature, sizeof (struct GNUNET_CRYPTO_RsaSignature));
288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "DONE `%s' message\n", "NAMESTORE_LOOKUP_NAME_RESPONSE");
289 GNUNET_SERVER_notification_context_unicast (snc, lnc->nc->client, (const struct GNUNET_MessageHeader *) lnr_msg, GNUNET_NO);
291 GNUNET_free (lnr_msg);
294 static void handle_lookup_name (void *cls,
295 struct GNUNET_SERVER_Client * client,
296 const struct GNUNET_MessageHeader * message)
298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "NAMESTORE_LOOKUP_NAME");
299 struct LookupNameContext lnc;
300 struct GNUNET_NAMESTORE_Client *nc;
301 GNUNET_HashCode name_hash;
308 if (ntohs (message->size) < sizeof (struct LookupNameMessage))
311 GNUNET_SERVER_receive_done (client, GNUNET_OK);
315 nc = client_lookup(client);
319 GNUNET_SERVER_receive_done (client, GNUNET_OK);
323 struct LookupNameMessage * ln_msg = (struct LookupNameMessage *) message;
324 id = ntohl (ln_msg->op_id);
325 name_len = ntohl (ln_msg->name_len);
326 type = ntohl (ln_msg->record_type);
328 if ((name_len == 0) || (name_len > 256))
331 GNUNET_SERVER_receive_done (client, GNUNET_OK);
335 name = GNUNET_malloc (name_len);
336 memcpy (name, &ln_msg[1], name_len);
337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Looking up record for name `%s'\n", name);
338 GNUNET_CRYPTO_hash(name, name_len-1, &name_hash);
341 /* do the actual lookup */
344 lnc.record_type = type;
345 GSN_database->iterate_records(GSN_database->cls, &ln_msg->zone, &ln_msg->zone, 0, &handle_lookup_name_it, &lnc);
347 GNUNET_SERVER_receive_done (client, GNUNET_OK);
352 * Process template requests.
355 * @param server the initialized server
356 * @param cfg configuration to use
359 run (void *cls, struct GNUNET_SERVER_Handle *server,
360 const struct GNUNET_CONFIGURATION_Handle *cfg)
364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting namestore service\n");
366 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
367 {&handle_start, NULL,
368 GNUNET_MESSAGE_TYPE_NAMESTORE_START, sizeof (struct StartMessage)},
369 {&handle_lookup_name, NULL,
370 GNUNET_MESSAGE_TYPE_NAMESTORE_LOOKUP_NAME, 0},
376 /* Loading database plugin */
378 GNUNET_CONFIGURATION_get_value_string (cfg, "namestore", "database",
380 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
382 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_namestore_%s", database);
383 GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) GSN_cfg);
384 if (GSN_database == NULL)
385 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Could not load database backend `%s'\n",
387 GNUNET_free (database);
389 /* Configuring server handles */
390 GNUNET_SERVER_add_handlers (server, handlers);
391 snc = GNUNET_SERVER_notification_context_create (server, 16);
392 GNUNET_SERVER_disconnect_notify (server,
393 &client_disconnect_notification,
396 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
403 * The main function for the template service.
405 * @param argc number of arguments from the command line
406 * @param argv command line arguments
407 * @return 0 ok, 1 on error
410 main (int argc, char *const *argv)
413 GNUNET_SERVICE_run (argc, argv, "namestore",
414 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
417 /* end of gnunet-service-namestore.c */