2 This file is part of GNUnet.
3 (C) 2012, 2013 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
25 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet_dnsparser_lib.h"
30 #include "gnunet_namecache_service.h"
31 #include "gnunet_namestore_service.h"
32 #include "gnunet_namestore_plugin.h"
33 #include "gnunet_signatures.h"
34 #include "namestore.h"
36 #define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
42 struct NamestoreClient;
46 * A namestore iteration operation.
51 * Next element in the DLL
53 struct ZoneIteration *next;
56 * Previous element in the DLL
58 struct ZoneIteration *prev;
61 * Namestore client which intiated this zone iteration
63 struct NamestoreClient *client;
66 * Key of the zone we are iterating over.
68 struct GNUNET_CRYPTO_EcdsaPrivateKey zone;
71 * The operation id fot the zone iteration in the response for the client
76 * Offset of the zone iteration used to address next result of the zone
77 * iteration in the store
79 * Initialy set to 0 in handle_iteration_start
80 * Incremented with by every call to handle_iteration_next
90 struct NamestoreClient
93 * Next element in the DLL
95 struct NamestoreClient *next;
98 * Previous element in the DLL
100 struct NamestoreClient *prev;
105 struct GNUNET_SERVER_Client *client;
109 * Zone iteration operations in progress initiated by this client
111 struct ZoneIteration *op_head;
115 * Zone iteration operations in progress initiated by this client
117 struct ZoneIteration *op_tail;
122 * A namestore monitor.
127 * Next element in the DLL
129 struct ZoneMonitor *next;
132 * Previous element in the DLL
134 struct ZoneMonitor *prev;
137 * Namestore client which intiated this zone monitor
139 struct NamestoreClient *nc;
142 * Private key of the zone.
144 struct GNUNET_CRYPTO_EcdsaPrivateKey zone;
147 * The operation id fot the zone iteration in the response for the client
152 * Task active during initial iteration.
154 GNUNET_SCHEDULER_TaskIdentifier task;
157 * Offset of the zone iteration used to address next result of the zone
158 * iteration in the store
161 * Incremented with by every call to #handle_iteration_next
169 * Pending operation on the namecache.
171 struct CacheOperation
177 struct CacheOperation *prev;
182 struct CacheOperation *next;
185 * Handle to namecache queue.
187 struct GNUNET_NAMECACHE_QueueEntry *qe;
190 * Client to notify about the result.
192 struct GNUNET_SERVER_Client *client;
195 * Client's request ID.
202 * Configuration handle.
204 static const struct GNUNET_CONFIGURATION_Handle *GSN_cfg;
209 static struct GNUNET_NAMECACHE_Handle *namecache;
214 static struct GNUNET_NAMESTORE_PluginFunctions *GSN_database;
217 * Name of the database plugin
219 static char *db_lib_name;
222 * Our notification context.
224 static struct GNUNET_SERVER_NotificationContext *snc;
227 * Head of the Client DLL
229 static struct NamestoreClient *client_head;
232 * Tail of the Client DLL
234 static struct NamestoreClient *client_tail;
239 static struct CacheOperation *cop_head;
244 static struct CacheOperation *cop_tail;
247 * First active zone monitor.
249 static struct ZoneMonitor *monitor_head;
252 * Last active zone monitor.
254 static struct ZoneMonitor *monitor_tail;
257 * Notification context shared by all monitors.
259 static struct GNUNET_SERVER_NotificationContext *monitor_nc;
264 * Task run during shutdown.
270 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
272 struct ZoneIteration *no;
273 struct NamestoreClient *nc;
274 struct CacheOperation *cop;
276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
277 "Stopping namestore service\n");
280 GNUNET_SERVER_notification_context_destroy (snc);
283 while (NULL != (cop = cop_head))
285 GNUNET_NAMECACHE_cancel (cop->qe);
286 GNUNET_CONTAINER_DLL_remove (cop_head,
291 GNUNET_NAMECACHE_disconnect (namecache);
293 while (NULL != (nc = client_head))
295 while (NULL != (no = nc->op_head))
297 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
300 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, nc);
301 GNUNET_SERVER_client_set_user_context (nc->client, NULL);
304 GNUNET_break (NULL == GNUNET_PLUGIN_unload (db_lib_name, GSN_database));
305 GNUNET_free (db_lib_name);
307 if (NULL != monitor_nc)
309 GNUNET_SERVER_notification_context_destroy (monitor_nc);
316 * Called whenever a client is disconnected.
317 * Frees our resources associated with that client.
320 * @param client identification of the client
323 client_disconnect_notification (void *cls,
324 struct GNUNET_SERVER_Client *client)
326 struct ZoneIteration *no;
327 struct NamestoreClient *nc;
328 struct ZoneMonitor *zm;
329 struct CacheOperation *cop;
333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
334 "Client %p disconnected\n",
336 if (NULL == (nc = GNUNET_SERVER_client_get_user_context (client, struct NamestoreClient)))
338 while (NULL != (no = nc->op_head))
340 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
343 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, nc);
345 for (zm = monitor_head; NULL != zm; zm = zm->next)
347 if (client == zm->nc->client)
349 GNUNET_CONTAINER_DLL_remove (monitor_head,
352 if (GNUNET_SCHEDULER_NO_TASK != zm->task)
354 GNUNET_SCHEDULER_cancel (zm->task);
355 zm->task = GNUNET_SCHEDULER_NO_TASK;
361 for (cop = cop_head; NULL != cop; cop = cop->next)
362 if (client == cop->client)
368 * Add a client to our list of active clients, if it is not yet
371 * @param client client to add
372 * @return internal namestore client structure for this client
374 static struct NamestoreClient *
375 client_lookup (struct GNUNET_SERVER_Client *client)
377 struct NamestoreClient *nc;
379 nc = GNUNET_SERVER_client_get_user_context (client, struct NamestoreClient);
382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
383 "Client %p connected\n",
385 nc = GNUNET_new (struct NamestoreClient);
387 GNUNET_SERVER_notification_context_add (snc, client);
388 GNUNET_CONTAINER_DLL_insert (client_head, client_tail, nc);
389 GNUNET_SERVER_client_set_user_context (client, nc);
395 * Generate a 'struct LookupNameResponseMessage' and send it to the
396 * given client using the given notification context.
398 * @param nc notification context to use
399 * @param client client to unicast to
400 * @param request_id request ID to use
401 * @param zone_key zone key of the zone
403 * @param rd_count number of records in @a rd
404 * @param rd array of records
407 send_lookup_response (struct GNUNET_SERVER_NotificationContext *nc,
408 struct GNUNET_SERVER_Client *client,
410 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
412 unsigned int rd_count,
413 const struct GNUNET_GNSRECORD_Data *rd)
415 struct RecordResultMessage *zir_msg;
422 name_len = strlen (name) + 1;
423 rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
424 msg_size = sizeof (struct RecordResultMessage) + name_len + rd_ser_len;
425 (void) client_lookup (client);
426 zir_msg = GNUNET_malloc (msg_size);
427 zir_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
428 zir_msg->gns_header.header.size = htons (msg_size);
429 zir_msg->gns_header.r_id = htonl (request_id);
430 zir_msg->name_len = htons (name_len);
431 zir_msg->rd_count = htons (rd_count);
432 zir_msg->rd_len = htons (rd_ser_len);
433 zir_msg->private_key = *zone_key;
434 name_tmp = (char *) &zir_msg[1];
435 memcpy (name_tmp, name, name_len);
436 rd_ser = &name_tmp[name_len];
437 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rd_ser_len, rd_ser);
438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
439 "Sending `%s' message with %u records and size %u\n",
443 GNUNET_SERVER_notification_context_unicast (nc,
445 &zir_msg->gns_header.header,
447 GNUNET_free (zir_msg);
452 * Send response to the store request to the client.
454 * @param client client to talk to
455 * @param res status of the operation
456 * @param rid client's request ID
459 send_store_response (struct GNUNET_SERVER_Client *client,
463 struct RecordStoreResponseMessage rcr_msg;
465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
466 "Sending `%s' message\n",
467 "RECORD_STORE_RESPONSE");
468 rcr_msg.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE_RESPONSE);
469 rcr_msg.gns_header.header.size = htons (sizeof (struct RecordStoreResponseMessage));
470 rcr_msg.gns_header.r_id = htonl (rid);
471 rcr_msg.op_result = htonl (res);
472 GNUNET_SERVER_notification_context_unicast (snc, client,
473 &rcr_msg.gns_header.header,
479 * Cache operation complete, clean up.
481 * @param cls the `struct CacheOperation`
484 finish_cache_operation (void *cls,
488 struct CacheOperation *cop = cls;
491 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
492 _("Failed to replicate block in namecache: %s\n"),
495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
496 "CACHE operation completed\n");
497 GNUNET_CONTAINER_DLL_remove (cop_head,
500 if (NULL != cop->client)
501 send_store_response (cop->client,
509 * We just touched the plaintext information about a name in our zone;
510 * refresh the corresponding (encrypted) block in the namestore.
512 * @param client client responsible for the request
513 * @param rid request ID of the client
514 * @param zone_key private key of the zone
515 * @param name label for the records
516 * @param rd_count number of records
517 * @param rd records stored under the given @a name
520 refresh_block (struct GNUNET_SERVER_Client *client,
522 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
524 unsigned int rd_count,
525 const struct GNUNET_GNSRECORD_Data *rd)
527 struct GNUNET_GNSRECORD_Block *block;
528 struct CacheOperation *cop;
529 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
532 block = GNUNET_GNSRECORD_block_create (zone_key,
533 GNUNET_TIME_UNIT_ZERO_ABS,
537 block = GNUNET_GNSRECORD_block_create (zone_key,
538 GNUNET_GNSRECORD_record_get_expiration_time (rd_count,
542 GNUNET_CRYPTO_ecdsa_key_get_public (zone_key,
544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
545 "Caching block for label `%s' in zone `%s' in namecache\n",
547 GNUNET_GNSRECORD_z2s (&pkey));
548 cop = GNUNET_new (struct CacheOperation);
549 cop->client = client;
551 GNUNET_CONTAINER_DLL_insert (cop_head,
554 cop->qe = GNUNET_NAMECACHE_block_cache (namecache,
556 &finish_cache_operation,
563 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message
566 * @param client client sending the message
567 * @param message message of type 'struct RecordCreateMessage'
570 handle_record_store (void *cls,
571 struct GNUNET_SERVER_Client *client,
572 const struct GNUNET_MessageHeader *message)
574 const struct RecordStoreMessage *rp_msg;
580 const char *name_tmp;
583 unsigned int rd_count;
585 struct GNUNET_CRYPTO_EcdsaPublicKey pubkey;
586 struct ZoneMonitor *zm;
588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
589 "Received `%s' message\n",
590 "NAMESTORE_RECORD_STORE");
591 if (ntohs (message->size) < sizeof (struct RecordStoreMessage))
594 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
597 rp_msg = (const struct RecordStoreMessage *) message;
598 rid = ntohl (rp_msg->gns_header.r_id);
599 name_len = ntohs (rp_msg->name_len);
600 msg_size = ntohs (message->size);
601 rd_count = ntohs (rp_msg->rd_count);
602 rd_ser_len = ntohs (rp_msg->rd_len);
603 GNUNET_break (0 == ntohs (rp_msg->reserved));
604 msg_size_exp = sizeof (struct RecordStoreMessage) + name_len + rd_ser_len;
605 if (msg_size != msg_size_exp)
608 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
611 if ((0 == name_len) || (name_len > MAX_NAME_LEN))
614 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
617 name_tmp = (const char *) &rp_msg[1];
618 rd_ser = &name_tmp[name_len];
619 if ('\0' != name_tmp[name_len -1])
622 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
625 (void) client_lookup (client);
627 struct GNUNET_GNSRECORD_Data rd[rd_count];
630 GNUNET_GNSRECORD_records_deserialize (rd_ser_len, rd_ser, rd_count, rd))
633 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
637 /* Extracting and converting private key */
638 GNUNET_CRYPTO_ecdsa_key_get_public (&rp_msg->private_key,
640 conv_name = GNUNET_GNSRECORD_string_to_lowercase (name_tmp);
641 if (NULL == conv_name)
643 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
644 "Error converting name `%s'\n", name_tmp);
645 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
649 "Creating %u records for name `%s' in zone `%s'\n",
650 (unsigned int) rd_count,
652 GNUNET_GNSRECORD_z2s (&pubkey));
654 if ( (0 == rd_count) &&
656 GSN_database->iterate_records (GSN_database->cls,
657 &rp_msg->private_key, 0, NULL, 0)) )
659 /* This name does not exist, so cannot be removed */
660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
661 "Name `%s' does not exist, no deletion required\n",
667 res = GSN_database->store_records (GSN_database->cls,
668 &rp_msg->private_key,
671 if (GNUNET_OK == res)
673 for (zm = monitor_head; NULL != zm; zm = zm->next)
674 if (0 == memcmp (&rp_msg->private_key, &zm->zone,
675 sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey)))
676 send_lookup_response (monitor_nc,
679 &rp_msg->private_key,
684 if (GNUNET_OK == res)
686 refresh_block (client, rid,
687 &rp_msg->private_key,
690 GNUNET_SERVER_receive_done (client, GNUNET_OK);
691 GNUNET_free (conv_name);
694 GNUNET_free (conv_name);
696 send_store_response (client, res, rid);
697 GNUNET_SERVER_receive_done (client, GNUNET_OK);
702 * Context for record remove operations passed from #handle_zone_to_name to
703 * #handle_zone_to_name_it as closure
710 struct NamestoreClient *nc;
713 * Request id (to be used in the response to the client).
718 * Set to #GNUNET_OK on success, #GNUNET_SYSERR on error. Note that
719 * not finding a name for the zone still counts as a 'success' here,
720 * as this field is about the success of executing the IPC protocol.
727 * Zone to name iterator
729 * @param cls struct ZoneToNameCtx *
730 * @param zone_key the zone key
732 * @param rd_count number of records in @a rd
733 * @param rd record data
736 handle_zone_to_name_it (void *cls,
737 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
739 unsigned int rd_count,
740 const struct GNUNET_GNSRECORD_Data *rd)
742 struct ZoneToNameCtx *ztn_ctx = cls;
743 struct ZoneToNameResponseMessage *ztnr_msg;
751 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
752 "Found result for zone-to-name lookup: `%s'\n",
755 name_len = (NULL == name) ? 0 : strlen (name) + 1;
756 rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
757 msg_size = sizeof (struct ZoneToNameResponseMessage) + name_len + rd_ser_len;
758 if (msg_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
761 ztn_ctx->success = GNUNET_SYSERR;
764 ztnr_msg = GNUNET_malloc (msg_size);
765 ztnr_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
766 ztnr_msg->gns_header.header.size = htons (msg_size);
767 ztnr_msg->gns_header.r_id = htonl (ztn_ctx->rid);
768 ztnr_msg->res = htons (res);
769 ztnr_msg->rd_len = htons (rd_ser_len);
770 ztnr_msg->rd_count = htons (rd_count);
771 ztnr_msg->name_len = htons (name_len);
772 ztnr_msg->zone = *zone_key;
773 name_tmp = (char *) &ztnr_msg[1];
775 memcpy (name_tmp, name, name_len);
776 rd_tmp = &name_tmp[name_len];
777 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rd_ser_len, rd_tmp);
778 ztn_ctx->success = GNUNET_OK;
779 GNUNET_SERVER_notification_context_unicast (snc, ztn_ctx->nc->client,
780 &ztnr_msg->gns_header.header,
782 GNUNET_free (ztnr_msg);
787 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME message
790 * @param client client sending the message
791 * @param message message of type 'struct ZoneToNameMessage'
794 handle_zone_to_name (void *cls,
795 struct GNUNET_SERVER_Client *client,
796 const struct GNUNET_MessageHeader *message)
798 struct NamestoreClient *nc;
799 const struct ZoneToNameMessage *ztn_msg;
800 struct ZoneToNameCtx ztn_ctx;
801 struct ZoneToNameResponseMessage ztnr_msg;
803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
804 "Received `%s' message\n",
806 ztn_msg = (const struct ZoneToNameMessage *) message;
807 nc = client_lookup (client);
808 ztn_ctx.rid = ntohl (ztn_msg->gns_header.r_id);
810 ztn_ctx.success = GNUNET_NO;
812 GSN_database->zone_to_name (GSN_database->cls,
814 &ztn_msg->value_zone,
815 &handle_zone_to_name_it, &ztn_ctx))
817 /* internal error, hang up instead of signalling something
818 that might be wrong */
820 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
823 if (GNUNET_NO == ztn_ctx.success)
825 /* no result found, send empty response */
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
827 "Found no result for zone-to-name lookup.\n");
828 memset (&ztnr_msg, 0, sizeof (ztnr_msg));
829 ztnr_msg.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
830 ztnr_msg.gns_header.header.size = htons (sizeof (ztnr_msg));
831 ztnr_msg.gns_header.r_id = ztn_msg->gns_header.r_id;
832 ztnr_msg.res = htons (GNUNET_NO);
833 GNUNET_SERVER_notification_context_unicast (snc,
835 &ztnr_msg.gns_header.header,
838 GNUNET_SERVER_receive_done (client, GNUNET_OK);
843 * Zone iteration processor result
845 enum ZoneIterationResult
854 * Continue to iterate with next iteration_next call
856 IT_SUCCESS_MORE_AVAILABLE = 1,
861 IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE = 2
866 * Context for record remove operations passed from
867 * #run_zone_iteration_round to #zone_iteraterate_proc as closure
869 struct ZoneIterationProcResult
872 * The zone iteration handle
874 struct ZoneIteration *zi;
877 * Iteration result: iteration done?
878 * #IT_SUCCESS_MORE_AVAILABLE: if there may be more results overall but
879 * we got one for now and have sent it to the client
880 * #IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE: if there are no further results,
881 * #IT_START: if we are still trying to find a result.
883 int res_iteration_finished;
889 * Process results for zone iteration from database
891 * @param cls struct ZoneIterationProcResult *proc
892 * @param zone_key the zone key
894 * @param rd_count number of records for this name
895 * @param rd record data
898 zone_iteraterate_proc (void *cls,
899 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
901 unsigned int rd_count,
902 const struct GNUNET_GNSRECORD_Data *rd)
904 struct ZoneIterationProcResult *proc = cls;
906 int do_refresh_block;
908 if ((NULL == zone_key) && (NULL == name))
910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
912 proc->res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
915 if ((NULL == zone_key) || (NULL == name))
917 /* what is this!? should never happen */
918 proc->res_iteration_finished = IT_START;
922 proc->res_iteration_finished = IT_SUCCESS_MORE_AVAILABLE;
923 send_lookup_response (snc,
924 proc->zi->client->client,
925 proc->zi->request_id,
930 do_refresh_block = GNUNET_NO;
931 for (i=0;i<rd_count;i++)
932 if( (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)) &&
933 (0 == (rd[i].flags & GNUNET_GNSRECORD_RF_PENDING)) )
935 do_refresh_block = GNUNET_YES;
938 if (GNUNET_YES == do_refresh_block)
939 refresh_block (NULL, 0,
949 * Perform the next round of the zone iteration.
951 * @param zi zone iterator to process
954 run_zone_iteration_round (struct ZoneIteration *zi)
956 static struct GNUNET_CRYPTO_EcdsaPrivateKey zero;
957 struct ZoneIterationProcResult proc;
958 struct RecordResultMessage rrm;
961 memset (&proc, 0, sizeof (proc));
963 proc.res_iteration_finished = IT_START;
964 while (IT_START == proc.res_iteration_finished)
967 (ret = GSN_database->iterate_records (GSN_database->cls,
968 (0 == memcmp (&zi->zone, &zero, sizeof (zero)))
972 &zone_iteraterate_proc, &proc)))
977 if (GNUNET_NO == ret)
978 proc.res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
981 if (IT_SUCCESS_MORE_AVAILABLE == proc.res_iteration_finished)
983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
984 "More results available\n");
985 return; /* more results later */
987 /* send empty response to indicate end of list */
988 memset (&rrm, 0, sizeof (rrm));
989 rrm.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
990 rrm.gns_header.header.size = htons (sizeof (rrm));
991 rrm.gns_header.r_id = htonl (zi->request_id);
992 GNUNET_SERVER_notification_context_unicast (snc,
994 &rrm.gns_header.header,
996 GNUNET_CONTAINER_DLL_remove (zi->client->op_head,
1004 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START message
1007 * @param client the client sending the message
1008 * @param message message of type 'struct ZoneIterationStartMessage'
1011 handle_iteration_start (void *cls,
1012 struct GNUNET_SERVER_Client *client,
1013 const struct GNUNET_MessageHeader *message)
1015 const struct ZoneIterationStartMessage *zis_msg;
1016 struct NamestoreClient *nc;
1017 struct ZoneIteration *zi;
1019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "ZONE_ITERATION_START");
1020 if (NULL == (nc = client_lookup (client)))
1023 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1026 zis_msg = (const struct ZoneIterationStartMessage *) message;
1027 zi = GNUNET_new (struct ZoneIteration);
1028 zi->request_id = ntohl (zis_msg->gns_header.r_id);
1031 zi->zone = zis_msg->zone;
1032 GNUNET_CONTAINER_DLL_insert (nc->op_head, nc->op_tail, zi);
1033 run_zone_iteration_round (zi);
1034 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1039 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP message
1042 * @param client GNUNET_SERVER_Client sending the message
1043 * @param message message of type 'struct ZoneIterationStopMessage'
1046 handle_iteration_stop (void *cls,
1047 struct GNUNET_SERVER_Client *client,
1048 const struct GNUNET_MessageHeader *message)
1050 struct NamestoreClient *nc;
1051 struct ZoneIteration *zi;
1052 const struct ZoneIterationStopMessage *zis_msg;
1055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1056 "Received `%s' message\n",
1057 "ZONE_ITERATION_STOP");
1058 if (NULL == (nc = client_lookup(client)))
1061 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1064 zis_msg = (const struct ZoneIterationStopMessage *) message;
1065 rid = ntohl (zis_msg->gns_header.r_id);
1066 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1067 if (zi->request_id == rid)
1072 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1075 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, zi);
1077 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1082 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT message
1085 * @param client GNUNET_SERVER_Client sending the message
1086 * @param message message of type 'struct ZoneIterationNextMessage'
1089 handle_iteration_next (void *cls,
1090 struct GNUNET_SERVER_Client *client,
1091 const struct GNUNET_MessageHeader *message)
1093 struct NamestoreClient *nc;
1094 struct ZoneIteration *zi;
1095 const struct ZoneIterationNextMessage *zis_msg;
1098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "ZONE_ITERATION_NEXT");
1099 if (NULL == (nc = client_lookup(client)))
1102 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1105 zis_msg = (const struct ZoneIterationNextMessage *) message;
1106 rid = ntohl (zis_msg->gns_header.r_id);
1107 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1108 if (zi->request_id == rid)
1113 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1116 run_zone_iteration_round (zi);
1117 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1122 * Send 'sync' message to zone monitor, we're now in sync.
1124 * @param zm monitor that is now in sync
1127 monitor_sync (struct ZoneMonitor *zm)
1129 struct GNUNET_MessageHeader sync;
1131 sync.size = htons (sizeof (struct GNUNET_MessageHeader));
1132 sync.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_SYNC);
1133 GNUNET_SERVER_notification_context_unicast (monitor_nc,
1141 * Obtain the next datum during the zone monitor's zone intiial iteration.
1143 * @param cls zone monitor that does its initial iteration
1144 * @param tc scheduler context
1147 monitor_next (void *cls,
1148 const struct GNUNET_SCHEDULER_TaskContext *tc);
1152 * A #GNUNET_NAMESTORE_RecordIterator for monitors.
1154 * @param cls a 'struct ZoneMonitor *' with information about the monitor
1155 * @param zone_key zone key of the zone
1157 * @param rd_count number of records in @a rd
1158 * @param rd array of records
1161 monitor_iterate_cb (void *cls,
1162 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1164 unsigned int rd_count,
1165 const struct GNUNET_GNSRECORD_Data *rd)
1167 struct ZoneMonitor *zm = cls;
1171 /* finished with iteration */
1175 send_lookup_response (monitor_nc,
1182 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1187 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START message
1190 * @param client the client sending the message
1191 * @param message message of type 'struct ZoneMonitorStartMessage'
1194 handle_monitor_start (void *cls,
1195 struct GNUNET_SERVER_Client *client,
1196 const struct GNUNET_MessageHeader *message)
1198 const struct ZoneMonitorStartMessage *zis_msg;
1199 struct ZoneMonitor *zm;
1201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1202 "Received `%s' message\n",
1203 "ZONE_MONITOR_START");
1204 zis_msg = (const struct ZoneMonitorStartMessage *) message;
1205 zm = GNUNET_new (struct ZoneMonitor);
1206 zm->request_id = ntohl (zis_msg->gns_header.r_id);
1208 zm->nc = client_lookup (client);
1209 zm->zone = zis_msg->zone;
1210 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, zm);
1211 GNUNET_SERVER_client_mark_monitor (client);
1212 GNUNET_SERVER_disable_receive_done_warning (client);
1213 GNUNET_SERVER_notification_context_add (monitor_nc,
1215 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1220 * Obtain the next datum during the zone monitor's zone intiial iteration.
1222 * @param cls zone monitor that does its initial iteration
1223 * @param tc scheduler context
1226 monitor_next (void *cls,
1227 const struct GNUNET_SCHEDULER_TaskContext *tc)
1229 struct ZoneMonitor *zm = cls;
1232 zm->task = GNUNET_SCHEDULER_NO_TASK;
1233 ret = GSN_database->iterate_records (GSN_database->cls,
1236 &monitor_iterate_cb, zm);
1237 if (GNUNET_SYSERR == ret)
1239 GNUNET_SERVER_client_disconnect (zm->nc->client);
1242 if (GNUNET_NO == ret)
1252 * Process namestore requests.
1254 * @param cls closure
1255 * @param server the initialized server
1256 * @param cfg configuration to use
1259 run (void *cls, struct GNUNET_SERVER_Handle *server,
1260 const struct GNUNET_CONFIGURATION_Handle *cfg)
1262 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1263 {&handle_record_store, NULL,
1264 GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE, 0},
1265 {&handle_zone_to_name, NULL,
1266 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME, sizeof (struct ZoneToNameMessage) },
1267 {&handle_iteration_start, NULL,
1268 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START, sizeof (struct ZoneIterationStartMessage) },
1269 {&handle_iteration_next, NULL,
1270 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT, sizeof (struct ZoneIterationNextMessage) },
1271 {&handle_iteration_stop, NULL,
1272 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP, sizeof (struct ZoneIterationStopMessage) },
1273 {&handle_monitor_start, NULL,
1274 GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START, sizeof (struct ZoneMonitorStartMessage) },
1279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting namestore service\n");
1281 monitor_nc = GNUNET_SERVER_notification_context_create (server, 1);
1282 namecache = GNUNET_NAMECACHE_connect (cfg);
1283 /* Loading database plugin */
1285 GNUNET_CONFIGURATION_get_value_string (cfg, "namestore", "database",
1287 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
1289 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_namestore_%s", database);
1290 GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) GSN_cfg);
1291 GNUNET_free (database);
1292 if (NULL == GSN_database)
1294 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1295 "Could not load database backend `%s'\n",
1297 GNUNET_SCHEDULER_add_now (&cleanup_task, NULL);
1301 /* Configuring server handles */
1302 GNUNET_SERVER_add_handlers (server, handlers);
1303 snc = GNUNET_SERVER_notification_context_create (server, 16);
1304 GNUNET_SERVER_disconnect_notify (server,
1305 &client_disconnect_notification,
1307 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
1313 * The main function for the template service.
1315 * @param argc number of arguments from the command line
1316 * @param argv command line arguments
1317 * @return 0 ok, 1 on error
1320 main (int argc, char *const *argv)
1322 return (GNUNET_OK ==
1323 GNUNET_SERVICE_run (argc, argv, "namestore",
1324 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
1327 /* end of gnunet-service-namestore.c */