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 * Task active during initial iteration.
149 GNUNET_SCHEDULER_TaskIdentifier task;
152 * Offset of the zone iteration used to address next result of the zone
153 * iteration in the store
156 * Incremented with by every call to #handle_iteration_next
164 * Pending operation on the namecache.
166 struct CacheOperation
172 struct CacheOperation *prev;
177 struct CacheOperation *next;
180 * Handle to namecache queue.
182 struct GNUNET_NAMECACHE_QueueEntry *qe;
185 * Client to notify about the result.
187 struct GNUNET_SERVER_Client *client;
190 * Client's request ID.
197 * Public key of all zeros.
199 static const struct GNUNET_CRYPTO_EcdsaPrivateKey zero;
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,
565 struct RecordLookupContext
571 unsigned int res_rd_count;
578 static void lookup_it (void *cls,
579 const struct GNUNET_CRYPTO_EcdsaPrivateKey *private_key,
581 unsigned int rd_count,
582 const struct GNUNET_GNSRECORD_Data *rd)
584 struct RecordLookupContext *rlc = cls;
586 if (0 == strcmp (label, rlc->label))
588 rlc->found = GNUNET_YES;
591 rlc->rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
592 rlc->res_rd_count = rd_count;
593 rlc->res_rd = GNUNET_malloc (rlc->rd_ser_len);
594 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rlc->rd_ser_len , rlc->res_rd);
599 rlc->res_rd_count = 0;
607 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP message
610 * @param client client sending the message
611 * @param message message of type 'struct RecordCreateMessage'
614 handle_record_lookup (void *cls,
615 struct GNUNET_SERVER_Client *client,
616 const struct GNUNET_MessageHeader *message)
618 const struct LabelLookupMessage *ll_msg;
619 struct LabelLookupResponseMessage *llr_msg;
620 struct RecordLookupContext rlc;
621 const char *name_tmp;
628 if (ntohs (message->size) < sizeof (struct LabelLookupMessage))
631 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
635 ll_msg = (const struct LabelLookupMessage *) message;
636 name_len = ntohl (ll_msg->label_len);
637 src_size = ntohs (message->size);
639 if (name_len != src_size - sizeof (struct LabelLookupMessage))
642 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
646 name_tmp = (const char *) &ll_msg[1];
647 if ('\0' != name_tmp[name_len -1])
650 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
654 GNUNET_SERVER_receive_done (client, GNUNET_OK);
655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
656 "Received `%s' message for name `%s'\n",
657 "NAMESTORE_RECORD_LOOKUP", name_tmp);
659 if (NULL == (client_lookup (client)))
662 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
666 rlc.label = name_tmp;
667 rlc.found = GNUNET_NO;
668 rlc.res_rd_count = 0;
672 res = GSN_database->lookup_records (GSN_database->cls,
673 &ll_msg->zone, name_tmp, &lookup_it, &rlc);
675 res_size = sizeof (struct LabelLookupResponseMessage) + name_len + rlc.rd_ser_len;
676 llr_msg = GNUNET_malloc (res_size);
677 llr_msg->gns_header.header.size = htons (res_size);
678 llr_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP_RESPONSE);
679 llr_msg->gns_header.r_id = ll_msg->gns_header.r_id;
680 llr_msg->private_key = ll_msg->zone;
681 llr_msg->name_len = htons (name_len);
682 llr_msg->rd_count = htons (rlc.res_rd_count);
683 llr_msg->rd_len = htons (rlc.rd_ser_len);
684 res_name = (char *) &llr_msg[1];
685 if ((GNUNET_YES == rlc.found) && (GNUNET_OK == res))
686 llr_msg->found = ntohs (GNUNET_YES);
688 llr_msg->found = ntohs (GNUNET_NO);
689 memcpy (&llr_msg[1], name_tmp, name_len);
690 memcpy (&res_name[name_len], rlc.res_rd, rlc.rd_ser_len);
692 GNUNET_SERVER_notification_context_unicast (snc, client, &llr_msg->gns_header.header,
695 GNUNET_free_non_null (rlc.res_rd);
696 GNUNET_free (llr_msg);
701 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message
704 * @param client client sending the message
705 * @param message message of type 'struct RecordCreateMessage'
708 handle_record_store (void *cls,
709 struct GNUNET_SERVER_Client *client,
710 const struct GNUNET_MessageHeader *message)
712 const struct RecordStoreMessage *rp_msg;
718 const char *name_tmp;
721 unsigned int rd_count;
723 struct GNUNET_CRYPTO_EcdsaPublicKey pubkey;
724 struct ZoneMonitor *zm;
726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
727 "Received `%s' message\n",
728 "NAMESTORE_RECORD_STORE");
729 if (ntohs (message->size) < sizeof (struct RecordStoreMessage))
732 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
735 rp_msg = (const struct RecordStoreMessage *) message;
736 rid = ntohl (rp_msg->gns_header.r_id);
737 name_len = ntohs (rp_msg->name_len);
738 msg_size = ntohs (message->size);
739 rd_count = ntohs (rp_msg->rd_count);
740 rd_ser_len = ntohs (rp_msg->rd_len);
741 GNUNET_break (0 == ntohs (rp_msg->reserved));
742 msg_size_exp = sizeof (struct RecordStoreMessage) + name_len + rd_ser_len;
743 if (msg_size != msg_size_exp)
746 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
749 if ((0 == name_len) || (name_len > MAX_NAME_LEN))
752 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
755 name_tmp = (const char *) &rp_msg[1];
756 rd_ser = &name_tmp[name_len];
757 if ('\0' != name_tmp[name_len -1])
760 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
763 (void) client_lookup (client);
765 struct GNUNET_GNSRECORD_Data rd[rd_count];
768 GNUNET_GNSRECORD_records_deserialize (rd_ser_len, rd_ser, rd_count, rd))
771 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
775 /* Extracting and converting private key */
776 GNUNET_CRYPTO_ecdsa_key_get_public (&rp_msg->private_key,
778 conv_name = GNUNET_GNSRECORD_string_to_lowercase (name_tmp);
779 if (NULL == conv_name)
781 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
782 "Error converting name `%s'\n", name_tmp);
783 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
786 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
787 "Creating %u records for name `%s' in zone `%s'\n",
788 (unsigned int) rd_count,
790 GNUNET_GNSRECORD_z2s (&pubkey));
792 if ( (0 == rd_count) &&
794 GSN_database->iterate_records (GSN_database->cls,
795 &rp_msg->private_key, 0, NULL, 0)) )
797 /* This name does not exist, so cannot be removed */
798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
799 "Name `%s' does not exist, no deletion required\n",
805 res = GSN_database->store_records (GSN_database->cls,
806 &rp_msg->private_key,
809 if (GNUNET_OK == res)
811 for (zm = monitor_head; NULL != zm; zm = zm->next)
813 if ( (0 == memcmp (&rp_msg->private_key, &zm->zone,
814 sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey))) ||
815 (0 == memcmp (&zm->zone,
817 sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey))) )
819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
820 "Notifying monitor about changes under label `%s'\n",
822 send_lookup_response (monitor_nc,
825 &rp_msg->private_key,
830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
831 "Monitor is for another zone\n");
833 if (NULL == monitor_head)
834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
835 "No monitors active\n");
839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
840 "Error storing record: %d\n",
844 if (GNUNET_OK == res)
846 refresh_block (client, rid,
847 &rp_msg->private_key,
850 GNUNET_SERVER_receive_done (client, GNUNET_OK);
851 GNUNET_free (conv_name);
854 GNUNET_free (conv_name);
856 send_store_response (client, res, rid);
857 GNUNET_SERVER_receive_done (client, GNUNET_OK);
862 * Context for record remove operations passed from #handle_zone_to_name to
863 * #handle_zone_to_name_it as closure
870 struct NamestoreClient *nc;
873 * Request id (to be used in the response to the client).
878 * Set to #GNUNET_OK on success, #GNUNET_SYSERR on error. Note that
879 * not finding a name for the zone still counts as a 'success' here,
880 * as this field is about the success of executing the IPC protocol.
887 * Zone to name iterator
889 * @param cls struct ZoneToNameCtx *
890 * @param zone_key the zone key
892 * @param rd_count number of records in @a rd
893 * @param rd record data
896 handle_zone_to_name_it (void *cls,
897 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
899 unsigned int rd_count,
900 const struct GNUNET_GNSRECORD_Data *rd)
902 struct ZoneToNameCtx *ztn_ctx = cls;
903 struct ZoneToNameResponseMessage *ztnr_msg;
911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
912 "Found result for zone-to-name lookup: `%s'\n",
915 name_len = (NULL == name) ? 0 : strlen (name) + 1;
916 rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
917 msg_size = sizeof (struct ZoneToNameResponseMessage) + name_len + rd_ser_len;
918 if (msg_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
921 ztn_ctx->success = GNUNET_SYSERR;
924 ztnr_msg = GNUNET_malloc (msg_size);
925 ztnr_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
926 ztnr_msg->gns_header.header.size = htons (msg_size);
927 ztnr_msg->gns_header.r_id = htonl (ztn_ctx->rid);
928 ztnr_msg->res = htons (res);
929 ztnr_msg->rd_len = htons (rd_ser_len);
930 ztnr_msg->rd_count = htons (rd_count);
931 ztnr_msg->name_len = htons (name_len);
932 ztnr_msg->zone = *zone_key;
933 name_tmp = (char *) &ztnr_msg[1];
935 memcpy (name_tmp, name, name_len);
936 rd_tmp = &name_tmp[name_len];
937 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rd_ser_len, rd_tmp);
938 ztn_ctx->success = GNUNET_OK;
939 GNUNET_SERVER_notification_context_unicast (snc, ztn_ctx->nc->client,
940 &ztnr_msg->gns_header.header,
942 GNUNET_free (ztnr_msg);
947 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME message
950 * @param client client sending the message
951 * @param message message of type 'struct ZoneToNameMessage'
954 handle_zone_to_name (void *cls,
955 struct GNUNET_SERVER_Client *client,
956 const struct GNUNET_MessageHeader *message)
958 struct NamestoreClient *nc;
959 const struct ZoneToNameMessage *ztn_msg;
960 struct ZoneToNameCtx ztn_ctx;
961 struct ZoneToNameResponseMessage ztnr_msg;
963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
964 "Received `%s' message\n",
966 ztn_msg = (const struct ZoneToNameMessage *) message;
967 nc = client_lookup (client);
968 ztn_ctx.rid = ntohl (ztn_msg->gns_header.r_id);
970 ztn_ctx.success = GNUNET_NO;
972 GSN_database->zone_to_name (GSN_database->cls,
974 &ztn_msg->value_zone,
975 &handle_zone_to_name_it, &ztn_ctx))
977 /* internal error, hang up instead of signalling something
978 that might be wrong */
980 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
983 if (GNUNET_NO == ztn_ctx.success)
985 /* no result found, send empty response */
986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
987 "Found no result for zone-to-name lookup.\n");
988 memset (&ztnr_msg, 0, sizeof (ztnr_msg));
989 ztnr_msg.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
990 ztnr_msg.gns_header.header.size = htons (sizeof (ztnr_msg));
991 ztnr_msg.gns_header.r_id = ztn_msg->gns_header.r_id;
992 ztnr_msg.res = htons (GNUNET_NO);
993 GNUNET_SERVER_notification_context_unicast (snc,
995 &ztnr_msg.gns_header.header,
998 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1003 * Zone iteration processor result
1005 enum ZoneIterationResult
1014 * Continue to iterate with next iteration_next call
1016 IT_SUCCESS_MORE_AVAILABLE = 1,
1019 * Iteration complete
1021 IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE = 2
1026 * Context for record remove operations passed from
1027 * #run_zone_iteration_round to #zone_iterate_proc as closure
1029 struct ZoneIterationProcResult
1032 * The zone iteration handle
1034 struct ZoneIteration *zi;
1037 * Iteration result: iteration done?
1038 * #IT_SUCCESS_MORE_AVAILABLE: if there may be more results overall but
1039 * we got one for now and have sent it to the client
1040 * #IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE: if there are no further results,
1041 * #IT_START: if we are still trying to find a result.
1043 int res_iteration_finished;
1049 * Process results for zone iteration from database
1051 * @param cls struct ZoneIterationProcResult *proc
1052 * @param zone_key the zone key
1054 * @param rd_count number of records for this name
1055 * @param rd record data
1058 zone_iterate_proc (void *cls,
1059 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1061 unsigned int rd_count,
1062 const struct GNUNET_GNSRECORD_Data *rd)
1064 struct ZoneIterationProcResult *proc = cls;
1066 int do_refresh_block;
1068 if ((NULL == zone_key) && (NULL == name))
1070 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1071 "Iteration done\n");
1072 proc->res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
1075 if ((NULL == zone_key) || (NULL == name))
1077 /* what is this!? should never happen */
1078 proc->res_iteration_finished = IT_START;
1082 proc->res_iteration_finished = IT_SUCCESS_MORE_AVAILABLE;
1083 send_lookup_response (snc,
1084 proc->zi->client->client,
1085 proc->zi->request_id,
1090 do_refresh_block = GNUNET_NO;
1091 for (i=0;i<rd_count;i++)
1092 if( (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)) &&
1093 (0 == (rd[i].flags & GNUNET_GNSRECORD_RF_PENDING)) )
1095 do_refresh_block = GNUNET_YES;
1098 if (GNUNET_YES == do_refresh_block)
1099 refresh_block (NULL, 0,
1109 * Perform the next round of the zone iteration.
1111 * @param zi zone iterator to process
1114 run_zone_iteration_round (struct ZoneIteration *zi)
1116 struct ZoneIterationProcResult proc;
1117 struct RecordResultMessage rrm;
1120 memset (&proc, 0, sizeof (proc));
1122 proc.res_iteration_finished = IT_START;
1123 while (IT_START == proc.res_iteration_finished)
1125 if (GNUNET_SYSERR ==
1126 (ret = GSN_database->iterate_records (GSN_database->cls,
1127 (0 == memcmp (&zi->zone, &zero, sizeof (zero)))
1131 &zone_iterate_proc, &proc)))
1136 if (GNUNET_NO == ret)
1137 proc.res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
1140 if (IT_SUCCESS_MORE_AVAILABLE == proc.res_iteration_finished)
1142 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1143 "More results available\n");
1144 return; /* more results later */
1146 /* send empty response to indicate end of list */
1147 memset (&rrm, 0, sizeof (rrm));
1148 rrm.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
1149 rrm.gns_header.header.size = htons (sizeof (rrm));
1150 rrm.gns_header.r_id = htonl (zi->request_id);
1151 GNUNET_SERVER_notification_context_unicast (snc,
1153 &rrm.gns_header.header,
1155 GNUNET_CONTAINER_DLL_remove (zi->client->op_head,
1156 zi->client->op_tail,
1163 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START message
1166 * @param client the client sending the message
1167 * @param message message of type 'struct ZoneIterationStartMessage'
1170 handle_iteration_start (void *cls,
1171 struct GNUNET_SERVER_Client *client,
1172 const struct GNUNET_MessageHeader *message)
1174 const struct ZoneIterationStartMessage *zis_msg;
1175 struct NamestoreClient *nc;
1176 struct ZoneIteration *zi;
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "ZONE_ITERATION_START");
1179 if (NULL == (nc = client_lookup (client)))
1182 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1185 zis_msg = (const struct ZoneIterationStartMessage *) message;
1186 zi = GNUNET_new (struct ZoneIteration);
1187 zi->request_id = ntohl (zis_msg->gns_header.r_id);
1190 zi->zone = zis_msg->zone;
1191 GNUNET_CONTAINER_DLL_insert (nc->op_head, nc->op_tail, zi);
1192 run_zone_iteration_round (zi);
1193 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1198 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP message
1201 * @param client GNUNET_SERVER_Client sending the message
1202 * @param message message of type 'struct ZoneIterationStopMessage'
1205 handle_iteration_stop (void *cls,
1206 struct GNUNET_SERVER_Client *client,
1207 const struct GNUNET_MessageHeader *message)
1209 struct NamestoreClient *nc;
1210 struct ZoneIteration *zi;
1211 const struct ZoneIterationStopMessage *zis_msg;
1214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1215 "Received `%s' message\n",
1216 "ZONE_ITERATION_STOP");
1217 if (NULL == (nc = client_lookup(client)))
1220 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1223 zis_msg = (const struct ZoneIterationStopMessage *) message;
1224 rid = ntohl (zis_msg->gns_header.r_id);
1225 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1226 if (zi->request_id == rid)
1231 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1234 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, zi);
1236 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1241 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT message
1244 * @param client GNUNET_SERVER_Client sending the message
1245 * @param message message of type 'struct ZoneIterationNextMessage'
1248 handle_iteration_next (void *cls,
1249 struct GNUNET_SERVER_Client *client,
1250 const struct GNUNET_MessageHeader *message)
1252 struct NamestoreClient *nc;
1253 struct ZoneIteration *zi;
1254 const struct ZoneIterationNextMessage *zis_msg;
1257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1258 "Received `%s' message\n",
1259 "ZONE_ITERATION_NEXT");
1260 if (NULL == (nc = client_lookup(client)))
1263 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1266 zis_msg = (const struct ZoneIterationNextMessage *) message;
1267 rid = ntohl (zis_msg->gns_header.r_id);
1268 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1269 if (zi->request_id == rid)
1274 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1277 run_zone_iteration_round (zi);
1278 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1283 * Send 'sync' message to zone monitor, we're now in sync.
1285 * @param zm monitor that is now in sync
1288 monitor_sync (struct ZoneMonitor *zm)
1290 struct GNUNET_MessageHeader sync;
1292 sync.size = htons (sizeof (struct GNUNET_MessageHeader));
1293 sync.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_SYNC);
1294 GNUNET_SERVER_notification_context_unicast (monitor_nc,
1302 * Obtain the next datum during the zone monitor's zone intiial iteration.
1304 * @param cls zone monitor that does its initial iteration
1305 * @param tc scheduler context
1308 monitor_next (void *cls,
1309 const struct GNUNET_SCHEDULER_TaskContext *tc);
1313 * A #GNUNET_NAMESTORE_RecordIterator for monitors.
1315 * @param cls a 'struct ZoneMonitor *' with information about the monitor
1316 * @param zone_key zone key of the zone
1318 * @param rd_count number of records in @a rd
1319 * @param rd array of records
1322 monitor_iterate_cb (void *cls,
1323 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1325 unsigned int rd_count,
1326 const struct GNUNET_GNSRECORD_Data *rd)
1328 struct ZoneMonitor *zm = cls;
1332 /* finished with iteration */
1336 send_lookup_response (monitor_nc,
1343 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1348 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START message
1351 * @param client the client sending the message
1352 * @param message message of type 'struct ZoneMonitorStartMessage'
1355 handle_monitor_start (void *cls,
1356 struct GNUNET_SERVER_Client *client,
1357 const struct GNUNET_MessageHeader *message)
1359 const struct ZoneMonitorStartMessage *zis_msg;
1360 struct ZoneMonitor *zm;
1362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1363 "Received `%s' message\n",
1364 "ZONE_MONITOR_START");
1365 zis_msg = (const struct ZoneMonitorStartMessage *) message;
1366 zm = GNUNET_new (struct ZoneMonitor);
1368 zm->nc = client_lookup (client);
1369 zm->zone = zis_msg->zone;
1370 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, zm);
1371 GNUNET_SERVER_client_mark_monitor (client);
1372 GNUNET_SERVER_disable_receive_done_warning (client);
1373 GNUNET_SERVER_notification_context_add (monitor_nc,
1375 if (GNUNET_YES == ntohl (zis_msg->iterate_first))
1376 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1383 * Obtain the next datum during the zone monitor's zone intiial iteration.
1385 * @param cls zone monitor that does its initial iteration
1386 * @param tc scheduler context
1389 monitor_next (void *cls,
1390 const struct GNUNET_SCHEDULER_TaskContext *tc)
1392 struct ZoneMonitor *zm = cls;
1395 zm->task = GNUNET_SCHEDULER_NO_TASK;
1396 ret = GSN_database->iterate_records (GSN_database->cls,
1397 (0 == memcmp (&zm->zone, &zero, sizeof (zero)))
1401 &monitor_iterate_cb, zm);
1402 if (GNUNET_SYSERR == ret)
1404 GNUNET_SERVER_client_disconnect (zm->nc->client);
1407 if (GNUNET_NO == ret)
1417 * Process namestore requests.
1419 * @param cls closure
1420 * @param server the initialized server
1421 * @param cfg configuration to use
1424 run (void *cls, struct GNUNET_SERVER_Handle *server,
1425 const struct GNUNET_CONFIGURATION_Handle *cfg)
1427 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1428 {&handle_record_store, NULL,
1429 GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE, 0},
1430 {&handle_record_lookup, NULL,
1431 GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP, 0},
1432 {&handle_zone_to_name, NULL,
1433 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME, sizeof (struct ZoneToNameMessage) },
1434 {&handle_iteration_start, NULL,
1435 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START, sizeof (struct ZoneIterationStartMessage) },
1436 {&handle_iteration_next, NULL,
1437 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT, sizeof (struct ZoneIterationNextMessage) },
1438 {&handle_iteration_stop, NULL,
1439 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP, sizeof (struct ZoneIterationStopMessage) },
1440 {&handle_monitor_start, NULL,
1441 GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START, sizeof (struct ZoneMonitorStartMessage) },
1446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting namestore service\n");
1448 monitor_nc = GNUNET_SERVER_notification_context_create (server, 1);
1449 namecache = GNUNET_NAMECACHE_connect (cfg);
1450 /* Loading database plugin */
1452 GNUNET_CONFIGURATION_get_value_string (cfg, "namestore", "database",
1454 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
1456 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_namestore_%s", database);
1457 GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) GSN_cfg);
1458 GNUNET_free (database);
1459 if (NULL == GSN_database)
1461 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1462 "Could not load database backend `%s'\n",
1464 GNUNET_SCHEDULER_add_now (&cleanup_task, NULL);
1468 /* Configuring server handles */
1469 GNUNET_SERVER_add_handlers (server, handlers);
1470 snc = GNUNET_SERVER_notification_context_create (server, 16);
1471 GNUNET_SERVER_disconnect_notify (server,
1472 &client_disconnect_notification,
1474 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
1480 * The main function for the template service.
1482 * @param argc number of arguments from the command line
1483 * @param argv command line arguments
1484 * @return 0 ok, 1 on error
1487 main (int argc, char *const *argv)
1489 return (GNUNET_OK ==
1490 GNUNET_SERVICE_run (argc, argv, "namestore",
1491 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
1494 /* end of gnunet-service-namestore.c */