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_gns_service.h"
31 #include "gnunet_namecache_service.h"
32 #include "gnunet_namestore_service.h"
33 #include "gnunet_namestore_plugin.h"
34 #include "gnunet_signatures.h"
35 #include "namestore.h"
37 #define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
43 struct NamestoreClient;
47 * A namestore iteration operation.
52 * Next element in the DLL
54 struct ZoneIteration *next;
57 * Previous element in the DLL
59 struct ZoneIteration *prev;
62 * Namestore client which intiated this zone iteration
64 struct NamestoreClient *client;
67 * The nick to add to the records
69 struct GNUNET_GNSRECORD_Data *nick;
72 * Key of the zone we are iterating over.
74 struct GNUNET_CRYPTO_EcdsaPrivateKey zone;
77 * The operation id fot the zone iteration in the response for the client
82 * Offset of the zone iteration used to address next result of the zone
83 * iteration in the store
85 * Initialy set to 0 in handle_iteration_start
86 * Incremented with by every call to handle_iteration_next
96 struct NamestoreClient
99 * Next element in the DLL
101 struct NamestoreClient *next;
104 * Previous element in the DLL
106 struct NamestoreClient *prev;
111 struct GNUNET_SERVER_Client *client;
115 * Zone iteration operations in progress initiated by this client
117 struct ZoneIteration *op_head;
121 * Zone iteration operations in progress initiated by this client
123 struct ZoneIteration *op_tail;
128 * A namestore monitor.
133 * Next element in the DLL
135 struct ZoneMonitor *next;
138 * Previous element in the DLL
140 struct ZoneMonitor *prev;
143 * Namestore client which intiated this zone monitor
145 struct NamestoreClient *nc;
148 * Private key of the zone.
150 struct GNUNET_CRYPTO_EcdsaPrivateKey zone;
153 * Task active during initial iteration.
155 GNUNET_SCHEDULER_TaskIdentifier task;
158 * Offset of the zone iteration used to address next result of the zone
159 * iteration in the store
162 * Incremented with by every call to #handle_iteration_next
170 * Pending operation on the namecache.
172 struct CacheOperation
178 struct CacheOperation *prev;
183 struct CacheOperation *next;
186 * Handle to namecache queue.
188 struct GNUNET_NAMECACHE_QueueEntry *qe;
191 * Client to notify about the result.
193 struct GNUNET_SERVER_Client *client;
196 * Client's request ID.
203 * Public key of all zeros.
205 static const struct GNUNET_CRYPTO_EcdsaPrivateKey zero;
208 * Configuration handle.
210 static const struct GNUNET_CONFIGURATION_Handle *GSN_cfg;
215 static struct GNUNET_NAMECACHE_Handle *namecache;
220 static struct GNUNET_NAMESTORE_PluginFunctions *GSN_database;
223 * Name of the database plugin
225 static char *db_lib_name;
228 * Our notification context.
230 static struct GNUNET_SERVER_NotificationContext *snc;
233 * Head of the Client DLL
235 static struct NamestoreClient *client_head;
238 * Tail of the Client DLL
240 static struct NamestoreClient *client_tail;
245 static struct CacheOperation *cop_head;
250 static struct CacheOperation *cop_tail;
253 * First active zone monitor.
255 static struct ZoneMonitor *monitor_head;
258 * Last active zone monitor.
260 static struct ZoneMonitor *monitor_tail;
263 * Notification context shared by all monitors.
265 static struct GNUNET_SERVER_NotificationContext *monitor_nc;
270 * Task run during shutdown.
276 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
278 struct ZoneIteration *no;
279 struct NamestoreClient *nc;
280 struct CacheOperation *cop;
282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
283 "Stopping namestore service\n");
286 GNUNET_SERVER_notification_context_destroy (snc);
289 while (NULL != (cop = cop_head))
291 GNUNET_NAMECACHE_cancel (cop->qe);
292 GNUNET_CONTAINER_DLL_remove (cop_head,
297 GNUNET_NAMECACHE_disconnect (namecache);
299 while (NULL != (nc = client_head))
301 while (NULL != (no = nc->op_head))
303 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
306 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, nc);
307 GNUNET_SERVER_client_set_user_context (nc->client, (void *)NULL);
310 GNUNET_break (NULL == GNUNET_PLUGIN_unload (db_lib_name, GSN_database));
311 GNUNET_free (db_lib_name);
313 if (NULL != monitor_nc)
315 GNUNET_SERVER_notification_context_destroy (monitor_nc);
322 * Called whenever a client is disconnected.
323 * Frees our resources associated with that client.
326 * @param client identification of the client
329 client_disconnect_notification (void *cls,
330 struct GNUNET_SERVER_Client *client)
332 struct ZoneIteration *no;
333 struct NamestoreClient *nc;
334 struct ZoneMonitor *zm;
335 struct CacheOperation *cop;
339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
340 "Client %p disconnected\n",
342 if (NULL == (nc = GNUNET_SERVER_client_get_user_context (client, struct NamestoreClient)))
344 while (NULL != (no = nc->op_head))
346 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, no);
349 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, nc);
351 for (zm = monitor_head; NULL != zm; zm = zm->next)
353 if (client == zm->nc->client)
355 GNUNET_CONTAINER_DLL_remove (monitor_head,
358 if (GNUNET_SCHEDULER_NO_TASK != zm->task)
360 GNUNET_SCHEDULER_cancel (zm->task);
361 zm->task = GNUNET_SCHEDULER_NO_TASK;
367 for (cop = cop_head; NULL != cop; cop = cop->next)
368 if (client == cop->client)
374 * Add a client to our list of active clients, if it is not yet
377 * @param client client to add
378 * @return internal namestore client structure for this client
380 static struct NamestoreClient *
381 client_lookup (struct GNUNET_SERVER_Client *client)
383 struct NamestoreClient *nc;
385 nc = GNUNET_SERVER_client_get_user_context (client, struct NamestoreClient);
388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
389 "Client %p connected\n",
391 nc = GNUNET_new (struct NamestoreClient);
393 GNUNET_SERVER_notification_context_add (snc, client);
394 GNUNET_CONTAINER_DLL_insert (client_head, client_tail, nc);
395 GNUNET_SERVER_client_set_user_context (client, nc);
400 static void lookup_nick_it (void *cls,
401 const struct GNUNET_CRYPTO_EcdsaPrivateKey *private_key,
403 unsigned int rd_count,
404 const struct GNUNET_GNSRECORD_Data *rd)
406 struct GNUNET_GNSRECORD_Data **res = (cls);
409 if (0 != strcmp (label, GNUNET_GNS_MASTERZONE_STR))
414 for (c = 0; c < rd_count; c++)
416 if (GNUNET_GNSRECORD_TYPE_NICK == rd[c].record_type)
418 (*res) = GNUNET_malloc (rd[c].data_size + sizeof (struct GNUNET_GNSRECORD_Data));
419 (*res)->data = &(*res)[1];
420 memcpy ((char *)(*res)->data, rd[c].data, rd[c].data_size);
421 (*res)->data_size = rd[c].data_size;
422 (*res)->expiration_time = rd[c].expiration_time;
423 (*res)->flags = rd[c].flags;
424 (*res)->record_type = GNUNET_GNSRECORD_TYPE_NICK;
432 static struct GNUNET_GNSRECORD_Data *
433 get_nick_record (const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone)
435 struct GNUNET_CRYPTO_EcdsaPublicKey pub;
436 struct GNUNET_GNSRECORD_Data *nick;
439 res = GSN_database->lookup_records (GSN_database->cls, zone,
440 GNUNET_GNS_MASTERZONE_STR, &lookup_nick_it, &nick);
442 if ((NULL == nick) || (GNUNET_OK != res))
444 GNUNET_CRYPTO_ecdsa_key_get_public (zone, &pub);
445 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No nick name set for zone `%s'\n",
446 GNUNET_CRYPTO_ecdsa_public_key_to_string (&pub));
454 static void merge_records (unsigned int rdc1,
455 const struct GNUNET_GNSRECORD_Data *rd1,
457 const struct GNUNET_GNSRECORD_Data *rd2,
458 unsigned int *rdc_res,
459 struct GNUNET_GNSRECORD_Data **rd_res)
466 (*rdc_res) = rdc1 + rdc2;
468 if (0 == rdc1 + rdc2)
475 for (c=0; c< rdc1; c++)
476 req += sizeof (struct GNUNET_GNSRECORD_Data) + rd1[c].data_size;
477 for (c=0; c< rdc2; c++)
478 req += sizeof (struct GNUNET_GNSRECORD_Data) + rd2[c].data_size;
479 (*rd_res) = GNUNET_malloc (req);
480 data = (char *) &(*rd_res)[rdc1 + rdc2];
483 for (c=0; c< rdc1; c++)
485 (*rd_res)[c] = rd1[c];
486 (*rd_res)[c].data = (void *) &data[data_offset];
487 memcpy ((void *) (*rd_res)[c].data, rd1[c].data, rd1[c].data_size);
488 data_offset += (*rd_res)[c].data_size;
490 record_offset = rdc1;
491 for (c=0; c< rdc2; c++)
493 (*rd_res)[c+record_offset] = rd2[c];
494 (*rd_res)[c+record_offset].data = (void *) &data[data_offset];
495 memcpy ((void *) (*rd_res)[c+record_offset].data, rd2[c].data, rd2[c].data_size);
496 data_offset += (*rd_res)[c+record_offset].data_size;
498 GNUNET_assert (req == (sizeof (struct GNUNET_GNSRECORD_Data)) * (*rdc_res) + data_offset);
504 * Generate a 'struct LookupNameResponseMessage' and send it to the
505 * given client using the given notification context.
507 * @param nc notification context to use
508 * @param client client to unicast to
509 * @param request_id request ID to use
510 * @param zone_key zone key of the zone
512 * @param rd_count number of records in @a rd
513 * @param rd array of records
516 send_lookup_response (struct GNUNET_SERVER_NotificationContext *nc,
517 struct GNUNET_SERVER_Client *client,
519 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
521 unsigned int rd_count,
522 const struct GNUNET_GNSRECORD_Data *rd)
524 struct RecordResultMessage *zir_msg;
525 struct GNUNET_GNSRECORD_Data *nick;
526 struct GNUNET_GNSRECORD_Data *res;
527 unsigned int res_count;
534 nick = get_nick_record (zone_key);
535 if ((NULL != nick) && (0 != strcmp(name, GNUNET_GNS_MASTERZONE_STR)))
537 nick->flags = (nick->flags | GNUNET_GNSRECORD_RF_PRIVATE) ^ GNUNET_GNSRECORD_RF_PRIVATE;
538 merge_records (rd_count,rd, 1, nick, &res_count, &res);
543 res_count = rd_count;
544 res = (struct GNUNET_GNSRECORD_Data *) rd;
547 name_len = strlen (name) + 1;
548 rd_ser_len = GNUNET_GNSRECORD_records_get_size (res_count, res);
549 msg_size = sizeof (struct RecordResultMessage) + name_len + rd_ser_len;
550 (void) client_lookup (client);
551 zir_msg = GNUNET_malloc (msg_size);
552 zir_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
553 zir_msg->gns_header.header.size = htons (msg_size);
554 zir_msg->gns_header.r_id = htonl (request_id);
555 zir_msg->name_len = htons (name_len);
556 zir_msg->rd_count = htons (res_count);
557 zir_msg->rd_len = htons (rd_ser_len);
558 zir_msg->private_key = *zone_key;
559 name_tmp = (char *) &zir_msg[1];
560 memcpy (name_tmp, name, name_len);
561 rd_ser = &name_tmp[name_len];
562 GNUNET_GNSRECORD_records_serialize (res_count, res, rd_ser_len, rd_ser);
563 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
564 "Sending `%s' message with %u records and size %u\n",
568 GNUNET_SERVER_notification_context_unicast (nc,
570 &zir_msg->gns_header.header,
574 GNUNET_free (zir_msg);
579 * Send response to the store request to the client.
581 * @param client client to talk to
582 * @param res status of the operation
583 * @param rid client's request ID
586 send_store_response (struct GNUNET_SERVER_Client *client,
590 struct RecordStoreResponseMessage rcr_msg;
592 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
593 "Sending `%s' message\n",
594 "RECORD_STORE_RESPONSE");
595 rcr_msg.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE_RESPONSE);
596 rcr_msg.gns_header.header.size = htons (sizeof (struct RecordStoreResponseMessage));
597 rcr_msg.gns_header.r_id = htonl (rid);
598 rcr_msg.op_result = htonl (res);
599 GNUNET_SERVER_notification_context_unicast (snc, client,
600 &rcr_msg.gns_header.header,
606 * Cache operation complete, clean up.
608 * @param cls the `struct CacheOperation`
609 * @param success success
610 * @param emsg error messages
613 finish_cache_operation (void *cls,
617 struct CacheOperation *cop = cls;
620 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
621 _("Failed to replicate block in namecache: %s\n"),
624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
625 "CACHE operation completed\n");
626 GNUNET_CONTAINER_DLL_remove (cop_head,
629 if (NULL != cop->client)
630 send_store_response (cop->client,
638 * We just touched the plaintext information about a name in our zone;
639 * refresh the corresponding (encrypted) block in the namestore.
641 * @param client client responsible for the request
642 * @param rid request ID of the client
643 * @param zone_key private key of the zone
644 * @param name label for the records
645 * @param rd_count number of records
646 * @param rd records stored under the given @a name
649 refresh_block (struct GNUNET_SERVER_Client *client,
651 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
653 unsigned int rd_count,
654 const struct GNUNET_GNSRECORD_Data *rd)
656 struct GNUNET_GNSRECORD_Block *block;
657 struct CacheOperation *cop;
658 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
661 block = GNUNET_GNSRECORD_block_create (zone_key,
662 GNUNET_TIME_UNIT_ZERO_ABS,
666 block = GNUNET_GNSRECORD_block_create (zone_key,
667 GNUNET_GNSRECORD_record_get_expiration_time (rd_count,
671 GNUNET_assert (NULL != block);
672 GNUNET_CRYPTO_ecdsa_key_get_public (zone_key,
674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
675 "Caching block for label `%s' in zone `%s' in namecache\n",
677 GNUNET_GNSRECORD_z2s (&pkey));
678 cop = GNUNET_new (struct CacheOperation);
679 cop->client = client;
681 GNUNET_CONTAINER_DLL_insert (cop_head,
684 cop->qe = GNUNET_NAMECACHE_block_cache (namecache,
686 &finish_cache_operation,
692 struct RecordLookupContext
698 unsigned int res_rd_count;
704 struct GNUNET_GNSRECORD_Data *nick;
710 lookup_it (void *cls, const struct GNUNET_CRYPTO_EcdsaPrivateKey *private_key,
711 const char *label, unsigned int rd_count,
712 const struct GNUNET_GNSRECORD_Data *rd)
714 struct RecordLookupContext *rlc = cls;
715 struct GNUNET_GNSRECORD_Data *rd_res;
716 unsigned int rdc_res;
718 if (0 == strcmp (label, rlc->label))
720 rlc->found = GNUNET_YES;
723 if ((NULL != rlc->nick) && (0 != strcmp(label, GNUNET_GNS_MASTERZONE_STR)))
728 rlc->nick->flags = (rlc->nick->flags | GNUNET_GNSRECORD_RF_PRIVATE) ^ GNUNET_GNSRECORD_RF_PRIVATE;
729 merge_records (rd_count, rd,
733 rlc->rd_ser_len = GNUNET_GNSRECORD_records_get_size (rdc_res, rd_res);
734 rlc->res_rd_count = rdc_res;
735 rlc->res_rd = GNUNET_malloc (rlc->rd_ser_len);
736 GNUNET_GNSRECORD_records_serialize (rdc_res, rd_res, rlc->rd_ser_len , rlc->res_rd);
738 GNUNET_free (rd_res);
739 GNUNET_free (rlc->nick);
744 rlc->rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
745 rlc->res_rd_count = rd_count;
746 rlc->res_rd = GNUNET_malloc (rlc->rd_ser_len);
747 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rlc->rd_ser_len , rlc->res_rd);
753 rlc->res_rd_count = 0;
764 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP message
767 * @param client client sending the message
768 * @param message message of type 'struct RecordCreateMessage'
771 handle_record_lookup (void *cls,
772 struct GNUNET_SERVER_Client *client,
773 const struct GNUNET_MessageHeader *message)
775 const struct LabelLookupMessage *ll_msg;
776 struct LabelLookupResponseMessage *llr_msg;
777 struct RecordLookupContext rlc;
778 const char *name_tmp;
785 if (ntohs (message->size) < sizeof (struct LabelLookupMessage))
788 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
792 ll_msg = (const struct LabelLookupMessage *) message;
793 name_len = ntohl (ll_msg->label_len);
794 src_size = ntohs (message->size);
796 if (name_len != src_size - sizeof (struct LabelLookupMessage))
799 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
803 name_tmp = (const char *) &ll_msg[1];
804 if ('\0' != name_tmp[name_len -1])
807 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
811 GNUNET_SERVER_receive_done (client, GNUNET_OK);
812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
813 "Received `%s' message for name `%s'\n",
814 "NAMESTORE_RECORD_LOOKUP", name_tmp);
816 if (NULL == (client_lookup (client)))
819 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
823 rlc.label = name_tmp;
824 rlc.found = GNUNET_NO;
825 rlc.res_rd_count = 0;
828 rlc.nick = get_nick_record (&ll_msg->zone);
830 res = GSN_database->lookup_records (GSN_database->cls,
831 &ll_msg->zone, name_tmp, &lookup_it, &rlc);
833 res_size = sizeof (struct LabelLookupResponseMessage) + name_len + rlc.rd_ser_len;
834 llr_msg = GNUNET_malloc (res_size);
835 llr_msg->gns_header.header.size = htons (res_size);
836 llr_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP_RESPONSE);
837 llr_msg->gns_header.r_id = ll_msg->gns_header.r_id;
838 llr_msg->private_key = ll_msg->zone;
839 llr_msg->name_len = htons (name_len);
840 llr_msg->rd_count = htons (rlc.res_rd_count);
841 llr_msg->rd_len = htons (rlc.rd_ser_len);
842 res_name = (char *) &llr_msg[1];
843 if ((GNUNET_YES == rlc.found) && (GNUNET_OK == res))
844 llr_msg->found = ntohs (GNUNET_YES);
846 llr_msg->found = ntohs (GNUNET_NO);
847 memcpy (&llr_msg[1], name_tmp, name_len);
848 memcpy (&res_name[name_len], rlc.res_rd, rlc.rd_ser_len);
850 GNUNET_SERVER_notification_context_unicast (snc, client, &llr_msg->gns_header.header,
853 GNUNET_free_non_null (rlc.res_rd);
854 GNUNET_free (llr_msg);
859 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE message
862 * @param client client sending the message
863 * @param message message of type 'struct RecordCreateMessage'
866 handle_record_store (void *cls,
867 struct GNUNET_SERVER_Client *client,
868 const struct GNUNET_MessageHeader *message)
870 const struct RecordStoreMessage *rp_msg;
876 const char *name_tmp;
879 unsigned int rd_count;
881 struct GNUNET_CRYPTO_EcdsaPublicKey pubkey;
882 struct ZoneMonitor *zm;
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
885 "Received `%s' message\n",
886 "NAMESTORE_RECORD_STORE");
887 if (ntohs (message->size) < sizeof (struct RecordStoreMessage))
890 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
893 rp_msg = (const struct RecordStoreMessage *) message;
894 rid = ntohl (rp_msg->gns_header.r_id);
895 name_len = ntohs (rp_msg->name_len);
896 msg_size = ntohs (message->size);
897 rd_count = ntohs (rp_msg->rd_count);
898 rd_ser_len = ntohs (rp_msg->rd_len);
899 GNUNET_break (0 == ntohs (rp_msg->reserved));
900 msg_size_exp = sizeof (struct RecordStoreMessage) + name_len + rd_ser_len;
901 if (msg_size != msg_size_exp)
904 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
907 if ((0 == name_len) || (name_len > MAX_NAME_LEN))
910 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
913 name_tmp = (const char *) &rp_msg[1];
914 rd_ser = &name_tmp[name_len];
915 if ('\0' != name_tmp[name_len -1])
918 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
921 (void) client_lookup (client);
923 struct GNUNET_GNSRECORD_Data rd[rd_count];
926 GNUNET_GNSRECORD_records_deserialize (rd_ser_len, rd_ser, rd_count, rd))
929 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
933 /* Extracting and converting private key */
934 GNUNET_CRYPTO_ecdsa_key_get_public (&rp_msg->private_key,
936 conv_name = GNUNET_GNSRECORD_string_to_lowercase (name_tmp);
937 if (NULL == conv_name)
939 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
940 "Error converting name `%s'\n", name_tmp);
941 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
945 "Creating %u records for name `%s' in zone `%s'\n",
946 (unsigned int) rd_count,
948 GNUNET_GNSRECORD_z2s (&pubkey));
950 if ( (0 == rd_count) &&
952 GSN_database->iterate_records (GSN_database->cls,
953 &rp_msg->private_key, 0, NULL, 0)) )
955 /* This name does not exist, so cannot be removed */
956 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
957 "Name `%s' does not exist, no deletion required\n",
963 res = GSN_database->store_records (GSN_database->cls,
964 &rp_msg->private_key,
967 if (GNUNET_OK == res)
969 for (zm = monitor_head; NULL != zm; zm = zm->next)
971 if ( (0 == memcmp (&rp_msg->private_key, &zm->zone,
972 sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey))) ||
973 (0 == memcmp (&zm->zone,
975 sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey))) )
977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
978 "Notifying monitor about changes under label `%s'\n",
980 send_lookup_response (monitor_nc,
983 &rp_msg->private_key,
988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
989 "Monitor is for another zone\n");
991 if (NULL == monitor_head)
992 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
993 "No monitors active\n");
997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
998 "Error storing record: %d\n",
1002 if (GNUNET_OK == res)
1004 refresh_block (client, rid,
1005 &rp_msg->private_key,
1008 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1009 GNUNET_free (conv_name);
1012 GNUNET_free (conv_name);
1014 send_store_response (client, res, rid);
1015 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1020 * Context for record remove operations passed from #handle_zone_to_name to
1021 * #handle_zone_to_name_it as closure
1023 struct ZoneToNameCtx
1028 struct NamestoreClient *nc;
1031 * Request id (to be used in the response to the client).
1036 * Set to #GNUNET_OK on success, #GNUNET_SYSERR on error. Note that
1037 * not finding a name for the zone still counts as a 'success' here,
1038 * as this field is about the success of executing the IPC protocol.
1045 * Zone to name iterator
1047 * @param cls struct ZoneToNameCtx *
1048 * @param zone_key the zone key
1050 * @param rd_count number of records in @a rd
1051 * @param rd record data
1054 handle_zone_to_name_it (void *cls,
1055 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1057 unsigned int rd_count,
1058 const struct GNUNET_GNSRECORD_Data *rd)
1060 struct ZoneToNameCtx *ztn_ctx = cls;
1061 struct ZoneToNameResponseMessage *ztnr_msg;
1069 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1070 "Found result for zone-to-name lookup: `%s'\n",
1073 name_len = (NULL == name) ? 0 : strlen (name) + 1;
1074 rd_ser_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
1075 msg_size = sizeof (struct ZoneToNameResponseMessage) + name_len + rd_ser_len;
1076 if (msg_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1079 ztn_ctx->success = GNUNET_SYSERR;
1082 ztnr_msg = GNUNET_malloc (msg_size);
1083 ztnr_msg->gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
1084 ztnr_msg->gns_header.header.size = htons (msg_size);
1085 ztnr_msg->gns_header.r_id = htonl (ztn_ctx->rid);
1086 ztnr_msg->res = htons (res);
1087 ztnr_msg->rd_len = htons (rd_ser_len);
1088 ztnr_msg->rd_count = htons (rd_count);
1089 ztnr_msg->name_len = htons (name_len);
1090 ztnr_msg->zone = *zone_key;
1091 name_tmp = (char *) &ztnr_msg[1];
1093 memcpy (name_tmp, name, name_len);
1094 rd_tmp = &name_tmp[name_len];
1095 GNUNET_GNSRECORD_records_serialize (rd_count, rd, rd_ser_len, rd_tmp);
1096 ztn_ctx->success = GNUNET_OK;
1097 GNUNET_SERVER_notification_context_unicast (snc, ztn_ctx->nc->client,
1098 &ztnr_msg->gns_header.header,
1100 GNUNET_free (ztnr_msg);
1105 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME message
1108 * @param client client sending the message
1109 * @param message message of type 'struct ZoneToNameMessage'
1112 handle_zone_to_name (void *cls,
1113 struct GNUNET_SERVER_Client *client,
1114 const struct GNUNET_MessageHeader *message)
1116 struct NamestoreClient *nc;
1117 const struct ZoneToNameMessage *ztn_msg;
1118 struct ZoneToNameCtx ztn_ctx;
1119 struct ZoneToNameResponseMessage ztnr_msg;
1121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1122 "Received `%s' message\n",
1124 ztn_msg = (const struct ZoneToNameMessage *) message;
1125 nc = client_lookup (client);
1126 ztn_ctx.rid = ntohl (ztn_msg->gns_header.r_id);
1128 ztn_ctx.success = GNUNET_NO;
1129 if (GNUNET_SYSERR ==
1130 GSN_database->zone_to_name (GSN_database->cls,
1132 &ztn_msg->value_zone,
1133 &handle_zone_to_name_it, &ztn_ctx))
1135 /* internal error, hang up instead of signalling something
1136 that might be wrong */
1138 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1141 if (GNUNET_NO == ztn_ctx.success)
1143 /* no result found, send empty response */
1144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1145 "Found no result for zone-to-name lookup.\n");
1146 memset (&ztnr_msg, 0, sizeof (ztnr_msg));
1147 ztnr_msg.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME_RESPONSE);
1148 ztnr_msg.gns_header.header.size = htons (sizeof (ztnr_msg));
1149 ztnr_msg.gns_header.r_id = ztn_msg->gns_header.r_id;
1150 ztnr_msg.res = htons (GNUNET_NO);
1151 GNUNET_SERVER_notification_context_unicast (snc,
1153 &ztnr_msg.gns_header.header,
1156 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1161 * Zone iteration processor result
1163 enum ZoneIterationResult
1172 * Continue to iterate with next iteration_next call
1174 IT_SUCCESS_MORE_AVAILABLE = 1,
1177 * Iteration complete
1179 IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE = 2
1184 * Context for record remove operations passed from
1185 * #run_zone_iteration_round to #zone_iterate_proc as closure
1187 struct ZoneIterationProcResult
1190 * The zone iteration handle
1192 struct ZoneIteration *zi;
1195 * Iteration result: iteration done?
1196 * #IT_SUCCESS_MORE_AVAILABLE: if there may be more results overall but
1197 * we got one for now and have sent it to the client
1198 * #IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE: if there are no further results,
1199 * #IT_START: if we are still trying to find a result.
1201 int res_iteration_finished;
1207 * Process results for zone iteration from database
1209 * @param cls struct ZoneIterationProcResult *proc
1210 * @param zone_key the zone key
1212 * @param rd_count number of records for this name
1213 * @param rd record data
1216 zone_iterate_proc (void *cls,
1217 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1219 unsigned int rd_count,
1220 const struct GNUNET_GNSRECORD_Data *rd)
1222 struct ZoneIterationProcResult *proc = cls;
1224 int do_refresh_block;
1226 if ((NULL == zone_key) && (NULL == name))
1228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1229 "Iteration done\n");
1230 proc->res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
1233 if ((NULL == zone_key) || (NULL == name))
1235 /* what is this!? should never happen */
1236 proc->res_iteration_finished = IT_START;
1240 proc->res_iteration_finished = IT_SUCCESS_MORE_AVAILABLE;
1241 send_lookup_response (snc,
1242 proc->zi->client->client,
1243 proc->zi->request_id,
1248 do_refresh_block = GNUNET_NO;
1249 for (i=0;i<rd_count;i++)
1250 if( (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION)) &&
1251 (0 == (rd[i].flags & GNUNET_GNSRECORD_RF_PENDING)) )
1253 do_refresh_block = GNUNET_YES;
1256 if (GNUNET_YES == do_refresh_block)
1257 refresh_block (NULL, 0,
1267 * Perform the next round of the zone iteration.
1269 * @param zi zone iterator to process
1272 run_zone_iteration_round (struct ZoneIteration *zi)
1274 struct ZoneIterationProcResult proc;
1275 struct RecordResultMessage rrm;
1278 memset (&proc, 0, sizeof (proc));
1280 proc.res_iteration_finished = IT_START;
1281 while (IT_START == proc.res_iteration_finished)
1283 if (GNUNET_SYSERR ==
1284 (ret = GSN_database->iterate_records (GSN_database->cls,
1285 (0 == memcmp (&zi->zone, &zero, sizeof (zero)))
1289 &zone_iterate_proc, &proc)))
1294 if (GNUNET_NO == ret)
1295 proc.res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
1298 if (IT_SUCCESS_MORE_AVAILABLE == proc.res_iteration_finished)
1300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1301 "More results available\n");
1302 return; /* more results later */
1304 /* send empty response to indicate end of list */
1305 memset (&rrm, 0, sizeof (rrm));
1306 rrm.gns_header.header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_RESULT);
1307 rrm.gns_header.header.size = htons (sizeof (rrm));
1308 rrm.gns_header.r_id = htonl (zi->request_id);
1309 GNUNET_SERVER_notification_context_unicast (snc,
1311 &rrm.gns_header.header,
1313 GNUNET_CONTAINER_DLL_remove (zi->client->op_head,
1314 zi->client->op_tail,
1321 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START message
1324 * @param client the client sending the message
1325 * @param message message of type 'struct ZoneIterationStartMessage'
1328 handle_iteration_start (void *cls,
1329 struct GNUNET_SERVER_Client *client,
1330 const struct GNUNET_MessageHeader *message)
1332 const struct ZoneIterationStartMessage *zis_msg;
1333 struct NamestoreClient *nc;
1334 struct ZoneIteration *zi;
1336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "ZONE_ITERATION_START");
1337 if (NULL == (nc = client_lookup (client)))
1340 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1343 zis_msg = (const struct ZoneIterationStartMessage *) message;
1344 zi = GNUNET_new (struct ZoneIteration);
1345 zi->request_id = ntohl (zis_msg->gns_header.r_id);
1348 zi->zone = zis_msg->zone;
1351 GNUNET_CONTAINER_DLL_insert (nc->op_head, nc->op_tail, zi);
1352 run_zone_iteration_round (zi);
1353 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1358 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP message
1361 * @param client GNUNET_SERVER_Client sending the message
1362 * @param message message of type 'struct ZoneIterationStopMessage'
1365 handle_iteration_stop (void *cls,
1366 struct GNUNET_SERVER_Client *client,
1367 const struct GNUNET_MessageHeader *message)
1369 struct NamestoreClient *nc;
1370 struct ZoneIteration *zi;
1371 const struct ZoneIterationStopMessage *zis_msg;
1374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1375 "Received `%s' message\n",
1376 "ZONE_ITERATION_STOP");
1377 if (NULL == (nc = client_lookup(client)))
1380 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1383 zis_msg = (const struct ZoneIterationStopMessage *) message;
1384 rid = ntohl (zis_msg->gns_header.r_id);
1385 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1386 if (zi->request_id == rid)
1391 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1394 GNUNET_CONTAINER_DLL_remove (nc->op_head, nc->op_tail, zi);
1396 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1401 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT message
1404 * @param client GNUNET_SERVER_Client sending the message
1405 * @param message message of type 'struct ZoneIterationNextMessage'
1408 handle_iteration_next (void *cls,
1409 struct GNUNET_SERVER_Client *client,
1410 const struct GNUNET_MessageHeader *message)
1412 struct NamestoreClient *nc;
1413 struct ZoneIteration *zi;
1414 const struct ZoneIterationNextMessage *zis_msg;
1417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1418 "Received `%s' message\n",
1419 "ZONE_ITERATION_NEXT");
1420 if (NULL == (nc = client_lookup(client)))
1423 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1426 zis_msg = (const struct ZoneIterationNextMessage *) message;
1427 rid = ntohl (zis_msg->gns_header.r_id);
1428 for (zi = nc->op_head; NULL != zi; zi = zi->next)
1429 if (zi->request_id == rid)
1434 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1437 run_zone_iteration_round (zi);
1438 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1443 * Send 'sync' message to zone monitor, we're now in sync.
1445 * @param zm monitor that is now in sync
1448 monitor_sync (struct ZoneMonitor *zm)
1450 struct GNUNET_MessageHeader sync;
1452 sync.size = htons (sizeof (struct GNUNET_MessageHeader));
1453 sync.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_SYNC);
1454 GNUNET_SERVER_notification_context_unicast (monitor_nc,
1462 * Obtain the next datum during the zone monitor's zone intiial iteration.
1464 * @param cls zone monitor that does its initial iteration
1465 * @param tc scheduler context
1468 monitor_next (void *cls,
1469 const struct GNUNET_SCHEDULER_TaskContext *tc);
1473 * A #GNUNET_NAMESTORE_RecordIterator for monitors.
1475 * @param cls a 'struct ZoneMonitor *' with information about the monitor
1476 * @param zone_key zone key of the zone
1478 * @param rd_count number of records in @a rd
1479 * @param rd array of records
1482 monitor_iterate_cb (void *cls,
1483 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
1485 unsigned int rd_count,
1486 const struct GNUNET_GNSRECORD_Data *rd)
1488 struct ZoneMonitor *zm = cls;
1492 /* finished with iteration */
1496 send_lookup_response (monitor_nc,
1503 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1508 * Handles a #GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START message
1511 * @param client the client sending the message
1512 * @param message message of type 'struct ZoneMonitorStartMessage'
1515 handle_monitor_start (void *cls,
1516 struct GNUNET_SERVER_Client *client,
1517 const struct GNUNET_MessageHeader *message)
1519 const struct ZoneMonitorStartMessage *zis_msg;
1520 struct ZoneMonitor *zm;
1522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1523 "Received `%s' message\n",
1524 "ZONE_MONITOR_START");
1525 zis_msg = (const struct ZoneMonitorStartMessage *) message;
1526 zm = GNUNET_new (struct ZoneMonitor);
1528 zm->nc = client_lookup (client);
1529 zm->zone = zis_msg->zone;
1530 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, zm);
1531 GNUNET_SERVER_client_mark_monitor (client);
1532 GNUNET_SERVER_disable_receive_done_warning (client);
1533 GNUNET_SERVER_notification_context_add (monitor_nc,
1535 if (GNUNET_YES == ntohl (zis_msg->iterate_first))
1536 zm->task = GNUNET_SCHEDULER_add_now (&monitor_next, zm);
1543 * Obtain the next datum during the zone monitor's zone intiial iteration.
1545 * @param cls zone monitor that does its initial iteration
1546 * @param tc scheduler context
1549 monitor_next (void *cls,
1550 const struct GNUNET_SCHEDULER_TaskContext *tc)
1552 struct ZoneMonitor *zm = cls;
1555 zm->task = GNUNET_SCHEDULER_NO_TASK;
1556 ret = GSN_database->iterate_records (GSN_database->cls,
1557 (0 == memcmp (&zm->zone, &zero, sizeof (zero)))
1561 &monitor_iterate_cb, zm);
1562 if (GNUNET_SYSERR == ret)
1564 GNUNET_SERVER_client_disconnect (zm->nc->client);
1567 if (GNUNET_NO == ret)
1577 * Process namestore requests.
1579 * @param cls closure
1580 * @param server the initialized server
1581 * @param cfg configuration to use
1584 run (void *cls, struct GNUNET_SERVER_Handle *server,
1585 const struct GNUNET_CONFIGURATION_Handle *cfg)
1587 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1588 {&handle_record_store, NULL,
1589 GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_STORE, 0},
1590 {&handle_record_lookup, NULL,
1591 GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_LOOKUP, 0},
1592 {&handle_zone_to_name, NULL,
1593 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_TO_NAME, sizeof (struct ZoneToNameMessage) },
1594 {&handle_iteration_start, NULL,
1595 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START, sizeof (struct ZoneIterationStartMessage) },
1596 {&handle_iteration_next, NULL,
1597 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT, sizeof (struct ZoneIterationNextMessage) },
1598 {&handle_iteration_stop, NULL,
1599 GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP, sizeof (struct ZoneIterationStopMessage) },
1600 {&handle_monitor_start, NULL,
1601 GNUNET_MESSAGE_TYPE_NAMESTORE_MONITOR_START, sizeof (struct ZoneMonitorStartMessage) },
1606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting namestore service\n");
1608 monitor_nc = GNUNET_SERVER_notification_context_create (server, 1);
1609 namecache = GNUNET_NAMECACHE_connect (cfg);
1610 /* Loading database plugin */
1612 GNUNET_CONFIGURATION_get_value_string (cfg, "namestore", "database",
1614 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
1616 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_namestore_%s", database);
1617 GSN_database = GNUNET_PLUGIN_load (db_lib_name, (void *) GSN_cfg);
1618 GNUNET_free (database);
1619 if (NULL == GSN_database)
1621 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1622 "Could not load database backend `%s'\n",
1624 GNUNET_SCHEDULER_add_now (&cleanup_task, NULL);
1628 /* Configuring server handles */
1629 GNUNET_SERVER_add_handlers (server, handlers);
1630 snc = GNUNET_SERVER_notification_context_create (server, 16);
1631 GNUNET_SERVER_disconnect_notify (server,
1632 &client_disconnect_notification,
1634 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
1640 * The main function for the template service.
1642 * @param argc number of arguments from the command line
1643 * @param argv command line arguments
1644 * @return 0 ok, 1 on error
1647 main (int argc, char *const *argv)
1649 return (GNUNET_OK ==
1650 GNUNET_SERVICE_run (argc, argv, "namestore",
1651 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
1654 /* end of gnunet-service-namestore.c */