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`
482 * @param success success
483 * @param emsg error messages
486 finish_cache_operation (void *cls,
490 struct CacheOperation *cop = cls;
493 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
494 _("Failed to replicate block in namecache: %s\n"),
497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
498 "CACHE operation completed\n");
499 GNUNET_CONTAINER_DLL_remove (cop_head,
502 if (NULL != cop->client)
503 send_store_response (cop->client,
511 * We just touched the plaintext information about a name in our zone;
512 * refresh the corresponding (encrypted) block in the namestore.
514 * @param client client responsible for the request
515 * @param rid request ID of the client
516 * @param zone_key private key of the zone
517 * @param name label for the records
518 * @param rd_count number of records
519 * @param rd records stored under the given @a name
522 refresh_block (struct GNUNET_SERVER_Client *client,
524 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
526 unsigned int rd_count,
527 const struct GNUNET_GNSRECORD_Data *rd)
529 struct GNUNET_GNSRECORD_Block *block;
530 struct CacheOperation *cop;
531 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
534 block = GNUNET_GNSRECORD_block_create (zone_key,
535 GNUNET_TIME_UNIT_ZERO_ABS,
539 block = GNUNET_GNSRECORD_block_create (zone_key,
540 GNUNET_GNSRECORD_record_get_expiration_time (rd_count,
544 GNUNET_assert (NULL != block);
545 GNUNET_CRYPTO_ecdsa_key_get_public (zone_key,
547 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
548 "Caching block for label `%s' in zone `%s' in namecache\n",
550 GNUNET_GNSRECORD_z2s (&pkey));
551 cop = GNUNET_new (struct CacheOperation);
552 cop->client = client;
554 GNUNET_CONTAINER_DLL_insert (cop_head,
557 cop->qe = GNUNET_NAMECACHE_block_cache (namecache,
559 &finish_cache_operation,
566 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message
569 * @param client client sending the message
570 * @param message message of type 'struct RecordCreateMessage'
573 handle_record_store (void *cls,
574 struct GNUNET_SERVER_Client *client,
575 const struct GNUNET_MessageHeader *message)
577 const struct RecordStoreMessage *rp_msg;
583 const char *name_tmp;
586 unsigned int rd_count;
588 struct GNUNET_CRYPTO_EcdsaPublicKey pubkey;
589 struct ZoneMonitor *zm;
591 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
592 "Received `%s' message\n",
593 "NAMESTORE_RECORD_STORE");
594 if (ntohs (message->size) < sizeof (struct RecordStoreMessage))
597 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
600 rp_msg = (const struct RecordStoreMessage *) message;
601 rid = ntohl (rp_msg->gns_header.r_id);
602 name_len = ntohs (rp_msg->name_len);
603 msg_size = ntohs (message->size);
604 rd_count = ntohs (rp_msg->rd_count);
605 rd_ser_len = ntohs (rp_msg->rd_len);
606 GNUNET_break (0 == ntohs (rp_msg->reserved));
607 msg_size_exp = sizeof (struct RecordStoreMessage) + name_len + rd_ser_len;
608 if (msg_size != msg_size_exp)
611 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
614 if ((0 == name_len) || (name_len > MAX_NAME_LEN))
617 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
620 name_tmp = (const char *) &rp_msg[1];
621 rd_ser = &name_tmp[name_len];
622 if ('\0' != name_tmp[name_len -1])
625 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
628 (void) client_lookup (client);
630 struct GNUNET_GNSRECORD_Data rd[rd_count];
633 GNUNET_GNSRECORD_records_deserialize (rd_ser_len, rd_ser, rd_count, rd))
636 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
640 /* Extracting and converting private key */
641 GNUNET_CRYPTO_ecdsa_key_get_public (&rp_msg->private_key,
643 conv_name = GNUNET_GNSRECORD_string_to_lowercase (name_tmp);
644 if (NULL == conv_name)
646 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
647 "Error converting name `%s'\n", name_tmp);
648 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
652 "Creating %u records for name `%s' in zone `%s'\n",
653 (unsigned int) rd_count,
655 GNUNET_GNSRECORD_z2s (&pubkey));
657 if ( (0 == rd_count) &&
659 GSN_database->iterate_records (GSN_database->cls,
660 &rp_msg->private_key, 0, NULL, 0)) )
662 /* This name does not exist, so cannot be removed */
663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
664 "Name `%s' does not exist, no deletion required\n",
670 res = GSN_database->store_records (GSN_database->cls,
671 &rp_msg->private_key,
674 if (GNUNET_OK == res)
676 for (zm = monitor_head; NULL != zm; zm = zm->next)
677 if (0 == memcmp (&rp_msg->private_key, &zm->zone,
678 sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey)))
679 send_lookup_response (monitor_nc,
682 &rp_msg->private_key,
687 if (GNUNET_OK == res)
689 refresh_block (client, rid,
690 &rp_msg->private_key,
693 GNUNET_SERVER_receive_done (client, GNUNET_OK);
694 GNUNET_free (conv_name);
697 GNUNET_free (conv_name);
699 send_store_response (client, res, rid);
700 GNUNET_SERVER_receive_done (client, GNUNET_OK);
705 * Context for record remove operations passed from #handle_zone_to_name to
706 * #handle_zone_to_name_it as closure
713 struct NamestoreClient *nc;
716 * Request id (to be used in the response to the client).
721 * Set to #GNUNET_OK on success, #GNUNET_SYSERR on error. Note that
722 * not finding a name for the zone still counts as a 'success' here,
723 * as this field is about the success of executing the IPC protocol.
730 * Zone to name iterator
732 * @param cls struct ZoneToNameCtx *
733 * @param zone_key the zone key
735 * @param rd_count number of records in @a rd
736 * @param rd record data
739 handle_zone_to_name_it (void *cls,
740 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
742 unsigned int rd_count,
743 const struct GNUNET_GNSRECORD_Data *rd)
745 struct ZoneToNameCtx *ztn_ctx = cls;
746 struct ZoneToNameResponseMessage *ztnr_msg;
754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
755 "Found result for zone-to-name lookup: `%s'\n",
758 name_len = (NULL == name) ? 0 : strlen (name) + 1;
759 rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
760 msg_size = sizeof (struct ZoneToNameResponseMessage) + name_len + rd_ser_len;
761 if (msg_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
764 ztn_ctx->success = GNUNET_SYSERR;
767 ztnr_msg = GNUNET_malloc (msg_size);
768 ztnr_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
769 ztnr_msg->gns_header.header.size = htons (msg_size);
770 ztnr_msg->gns_header.r_id = htonl (ztn_ctx->rid);
771 ztnr_msg->res = htons (res);
772 ztnr_msg->rd_len = htons (rd_ser_len);
773 ztnr_msg->rd_count = htons (rd_count);
774 ztnr_msg->name_len = htons (name_len);
775 ztnr_msg->zone = *zone_key;
776 name_tmp = (char *) &ztnr_msg[1];
778 memcpy (name_tmp, name, name_len);
779 rd_tmp = &name_tmp[name_len];
780 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rd_ser_len, rd_tmp);
781 ztn_ctx->success = GNUNET_OK;
782 GNUNET_SERVER_notification_context_unicast (snc, ztn_ctx->nc->client,
783 &ztnr_msg->gns_header.header,
785 GNUNET_free (ztnr_msg);
790 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME message
793 * @param client client sending the message
794 * @param message message of type 'struct ZoneToNameMessage'
797 handle_zone_to_name (void *cls,
798 struct GNUNET_SERVER_Client *client,
799 const struct GNUNET_MessageHeader *message)
801 struct NamestoreClient *nc;
802 const struct ZoneToNameMessage *ztn_msg;
803 struct ZoneToNameCtx ztn_ctx;
804 struct ZoneToNameResponseMessage ztnr_msg;
806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
807 "Received `%s' message\n",
809 ztn_msg = (const struct ZoneToNameMessage *) message;
810 nc = client_lookup (client);
811 ztn_ctx.rid = ntohl (ztn_msg->gns_header.r_id);
813 ztn_ctx.success = GNUNET_NO;
815 GSN_database->zone_to_name (GSN_database->cls,
817 &ztn_msg->value_zone,
818 &handle_zone_to_name_it, &ztn_ctx))
820 /* internal error, hang up instead of signalling something
821 that might be wrong */
823 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
826 if (GNUNET_NO == ztn_ctx.success)
828 /* no result found, send empty response */
829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
830 "Found no result for zone-to-name lookup.\n");
831 memset (&ztnr_msg, 0, sizeof (ztnr_msg));
832 ztnr_msg.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
833 ztnr_msg.gns_header.header.size = htons (sizeof (ztnr_msg));
834 ztnr_msg.gns_header.r_id = ztn_msg->gns_header.r_id;
835 ztnr_msg.res = htons (GNUNET_NO);
836 GNUNET_SERVER_notification_context_unicast (snc,
838 &ztnr_msg.gns_header.header,
841 GNUNET_SERVER_receive_done (client, GNUNET_OK);
846 * Zone iteration processor result
848 enum ZoneIterationResult
857 * Continue to iterate with next iteration_next call
859 IT_SUCCESS_MORE_AVAILABLE = 1,
864 IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE = 2
869 * Context for record remove operations passed from
870 * #run_zone_iteration_round to #zone_iteraterate_proc as closure
872 struct ZoneIterationProcResult
875 * The zone iteration handle
877 struct ZoneIteration *zi;
880 * Iteration result: iteration done?
881 * #IT_SUCCESS_MORE_AVAILABLE: if there may be more results overall but
882 * we got one for now and have sent it to the client
883 * #IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE: if there are no further results,
884 * #IT_START: if we are still trying to find a result.
886 int res_iteration_finished;
892 * Process results for zone iteration from database
894 * @param cls struct ZoneIterationProcResult *proc
895 * @param zone_key the zone key
897 * @param rd_count number of records for this name
898 * @param rd record data
901 zone_iteraterate_proc (void *cls,
902 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
904 unsigned int rd_count,
905 const struct GNUNET_GNSRECORD_Data *rd)
907 struct ZoneIterationProcResult *proc = cls;
909 int do_refresh_block;
911 if ((NULL == zone_key) && (NULL == name))
913 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 proc->res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
918 if ((NULL == zone_key) || (NULL == name))
920 /* what is this!? should never happen */
921 proc->res_iteration_finished = IT_START;
925 proc->res_iteration_finished = IT_SUCCESS_MORE_AVAILABLE;
926 send_lookup_response (snc,
927 proc->zi->client->client,
928 proc->zi->request_id,
933 do_refresh_block = GNUNET_NO;
934 for (i=0;i<rd_count;i++)
935 if( (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)) &&
936 (0 == (rd[i].flags & GNUNET_GNSRECORD_RF_PENDING)) )
938 do_refresh_block = GNUNET_YES;
941 if (GNUNET_YES == do_refresh_block)
942 refresh_block (NULL, 0,
952 * Perform the next round of the zone iteration.
954 * @param zi zone iterator to process
957 run_zone_iteration_round (struct ZoneIteration *zi)
959 static struct GNUNET_CRYPTO_EcdsaPrivateKey zero;
960 struct ZoneIterationProcResult proc;
961 struct RecordResultMessage rrm;
964 memset (&proc, 0, sizeof (proc));
966 proc.res_iteration_finished = IT_START;
967 while (IT_START == proc.res_iteration_finished)
970 (ret = GSN_database->iterate_records (GSN_database->cls,
971 (0 == memcmp (&zi->zone, &zero, sizeof (zero)))
975 &zone_iteraterate_proc, &proc)))
980 if (GNUNET_NO == ret)
981 proc.res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
984 if (IT_SUCCESS_MORE_AVAILABLE == proc.res_iteration_finished)
986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
987 "More results available\n");
988 return; /* more results later */
990 /* send empty response to indicate end of list */
991 memset (&rrm, 0, sizeof (rrm));
992 rrm.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
993 rrm.gns_header.header.size = htons (sizeof (rrm));
994 rrm.gns_header.r_id = htonl (zi->request_id);
995 GNUNET_SERVER_notification_context_unicast (snc,
997 &rrm.gns_header.header,
999 GNUNET_CONTAINER_DLL_remove (zi->client->op_head,
1000 zi->client->op_tail,
1007 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START message
1010 * @param client the client sending the message
1011 * @param message message of type 'struct ZoneIterationStartMessage'
1014 handle_iteration_start (void *cls,
1015 struct GNUNET_SERVER_Client *client,
1016 const struct GNUNET_MessageHeader *message)
1018 const struct ZoneIterationStartMessage *zis_msg;
1019 struct NamestoreClient *nc;
1020 struct ZoneIteration *zi;
1022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "ZONE_ITERATION_START");
1023 if (NULL == (nc = client_lookup (client)))
1026 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1029 zis_msg = (const struct ZoneIterationStartMessage *) message;
1030 zi = GNUNET_new (struct ZoneIteration);
1031 zi->request_id = ntohl (zis_msg->gns_header.r_id);
1034 zi->zone = zis_msg->zone;
1035 GNUNET_CONTAINER_DLL_insert (nc->op_head, nc->op_tail, zi);
1036 run_zone_iteration_round (zi);
1037 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1042 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP message
1045 * @param client GNUNET_SERVER_Client sending the message
1046 * @param message message of type 'struct ZoneIterationStopMessage'
1049 handle_iteration_stop (void *cls,
1050 struct GNUNET_SERVER_Client *client,
1051 const struct GNUNET_MessageHeader *message)
1053 struct NamestoreClient *nc;
1054 struct ZoneIteration *zi;
1055 const struct ZoneIterationStopMessage *zis_msg;
1058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1059 "Received `%s' message\n",
1060 "ZONE_ITERATION_STOP");
1061 if (NULL == (nc = client_lookup(client)))
1064 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1067 zis_msg = (const struct ZoneIterationStopMessage *) message;
1068 rid = ntohl (zis_msg->gns_header.r_id);
1069 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1070 if (zi->request_id == rid)
1075 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1078 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, zi);
1080 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1085 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT message
1088 * @param client GNUNET_SERVER_Client sending the message
1089 * @param message message of type 'struct ZoneIterationNextMessage'
1092 handle_iteration_next (void *cls,
1093 struct GNUNET_SERVER_Client *client,
1094 const struct GNUNET_MessageHeader *message)
1096 struct NamestoreClient *nc;
1097 struct ZoneIteration *zi;
1098 const struct ZoneIterationNextMessage *zis_msg;
1101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "ZONE_ITERATION_NEXT");
1102 if (NULL == (nc = client_lookup(client)))
1105 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1108 zis_msg = (const struct ZoneIterationNextMessage *) message;
1109 rid = ntohl (zis_msg->gns_header.r_id);
1110 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1111 if (zi->request_id == rid)
1116 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1119 run_zone_iteration_round (zi);
1120 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1125 * Send 'sync' message to zone monitor, we're now in sync.
1127 * @param zm monitor that is now in sync
1130 monitor_sync (struct ZoneMonitor *zm)
1132 struct GNUNET_MessageHeader sync;
1134 sync.size = htons (sizeof (struct GNUNET_MessageHeader));
1135 sync.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_SYNC);
1136 GNUNET_SERVER_notification_context_unicast (monitor_nc,
1144 * Obtain the next datum during the zone monitor's zone intiial iteration.
1146 * @param cls zone monitor that does its initial iteration
1147 * @param tc scheduler context
1150 monitor_next (void *cls,
1151 const struct GNUNET_SCHEDULER_TaskContext *tc);
1155 * A #GNUNET_NAMESTORE_RecordIterator for monitors.
1157 * @param cls a 'struct ZoneMonitor *' with information about the monitor
1158 * @param zone_key zone key of the zone
1160 * @param rd_count number of records in @a rd
1161 * @param rd array of records
1164 monitor_iterate_cb (void *cls,
1165 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1167 unsigned int rd_count,
1168 const struct GNUNET_GNSRECORD_Data *rd)
1170 struct ZoneMonitor *zm = cls;
1174 /* finished with iteration */
1178 send_lookup_response (monitor_nc,
1185 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1190 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START message
1193 * @param client the client sending the message
1194 * @param message message of type 'struct ZoneMonitorStartMessage'
1197 handle_monitor_start (void *cls,
1198 struct GNUNET_SERVER_Client *client,
1199 const struct GNUNET_MessageHeader *message)
1201 const struct ZoneMonitorStartMessage *zis_msg;
1202 struct ZoneMonitor *zm;
1204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1205 "Received `%s' message\n",
1206 "ZONE_MONITOR_START");
1207 zis_msg = (const struct ZoneMonitorStartMessage *) message;
1208 zm = GNUNET_new (struct ZoneMonitor);
1209 zm->request_id = ntohl (zis_msg->gns_header.r_id);
1211 zm->nc = client_lookup (client);
1212 zm->zone = zis_msg->zone;
1213 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, zm);
1214 GNUNET_SERVER_client_mark_monitor (client);
1215 GNUNET_SERVER_disable_receive_done_warning (client);
1216 GNUNET_SERVER_notification_context_add (monitor_nc,
1218 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1223 * Obtain the next datum during the zone monitor's zone intiial iteration.
1225 * @param cls zone monitor that does its initial iteration
1226 * @param tc scheduler context
1229 monitor_next (void *cls,
1230 const struct GNUNET_SCHEDULER_TaskContext *tc)
1232 struct ZoneMonitor *zm = cls;
1235 zm->task = GNUNET_SCHEDULER_NO_TASK;
1236 ret = GSN_database->iterate_records (GSN_database->cls,
1239 &monitor_iterate_cb, zm);
1240 if (GNUNET_SYSERR == ret)
1242 GNUNET_SERVER_client_disconnect (zm->nc->client);
1245 if (GNUNET_NO == ret)
1255 * Process namestore requests.
1257 * @param cls closure
1258 * @param server the initialized server
1259 * @param cfg configuration to use
1262 run (void *cls, struct GNUNET_SERVER_Handle *server,
1263 const struct GNUNET_CONFIGURATION_Handle *cfg)
1265 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1266 {&handle_record_store, NULL,
1267 GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE, 0},
1268 {&handle_zone_to_name, NULL,
1269 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME, sizeof (struct ZoneToNameMessage) },
1270 {&handle_iteration_start, NULL,
1271 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START, sizeof (struct ZoneIterationStartMessage) },
1272 {&handle_iteration_next, NULL,
1273 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT, sizeof (struct ZoneIterationNextMessage) },
1274 {&handle_iteration_stop, NULL,
1275 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP, sizeof (struct ZoneIterationStopMessage) },
1276 {&handle_monitor_start, NULL,
1277 GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START, sizeof (struct ZoneMonitorStartMessage) },
1282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting namestore service\n");
1284 monitor_nc = GNUNET_SERVER_notification_context_create (server, 1);
1285 namecache = GNUNET_NAMECACHE_connect (cfg);
1286 /* Loading database plugin */
1288 GNUNET_CONFIGURATION_get_value_string (cfg, "namestore", "database",
1290 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
1292 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_namestore_%s", database);
1293 GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) GSN_cfg);
1294 GNUNET_free (database);
1295 if (NULL == GSN_database)
1297 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1298 "Could not load database backend `%s'\n",
1300 GNUNET_SCHEDULER_add_now (&cleanup_task, NULL);
1304 /* Configuring server handles */
1305 GNUNET_SERVER_add_handlers (server, handlers);
1306 snc = GNUNET_SERVER_notification_context_create (server, 16);
1307 GNUNET_SERVER_disconnect_notify (server,
1308 &client_disconnect_notification,
1310 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
1316 * The main function for the template service.
1318 * @param argc number of arguments from the command line
1319 * @param argv command line arguments
1320 * @return 0 ok, 1 on error
1323 main (int argc, char *const *argv)
1325 return (GNUNET_OK ==
1326 GNUNET_SERVICE_run (argc, argv, "namestore",
1327 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
1330 /* end of gnunet-service-namestore.c */