2 This file is part of GNUnet.
3 (C) 2009, 2010 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/namestore_api.c
23 * @brief API to access the NAMESTORE service
24 * @author Martin Schanzenbach
25 * @author Matthias Wachs
29 #include "gnunet_util_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_arm_service.h"
32 #include "gnunet_namestore_service.h"
33 #include "namestore.h"
34 #define DEBUG_GNS_API GNUNET_EXTRA_LOGGING
36 #define LOG(kind,...) GNUNET_log_from (kind, "gns-api",__VA_ARGS__)
41 struct GNUNET_NAMESTORE_QueueEntry
43 struct GNUNET_NAMESTORE_QueueEntry *next;
44 struct GNUNET_NAMESTORE_QueueEntry *prev;
46 struct GNUNET_NAMESTORE_Handle *nsh;
50 GNUNET_NAMESTORE_ContinuationWithStatus cont;
53 GNUNET_NAMESTORE_RecordProcessor proc;
56 char *data; /*stub data pointer*/
63 struct GNUNET_NAMESTORE_ZoneIterator
65 struct GNUNET_NAMESTORE_ZoneIterator *next;
66 struct GNUNET_NAMESTORE_ZoneIterator *prev;
68 struct GNUNET_NAMESTORE_Handle *h;
69 GNUNET_NAMESTORE_RecordProcessor proc;
71 const GNUNET_HashCode * zone;
78 * Message in linked list we should send to the service. The
79 * actual binary message follows this struct.
87 struct PendingMessage *next;
92 struct PendingMessage *prev;
95 * Size of the message.
100 * Is this the 'START' message?
107 * Connection to the NAMESTORE service.
109 struct GNUNET_NAMESTORE_Handle
113 * Configuration to use.
115 const struct GNUNET_CONFIGURATION_Handle *cfg;
118 * Socket (if available).
120 struct GNUNET_CLIENT_Connection *client;
123 * Currently pending transmission request (or NULL).
125 struct GNUNET_CLIENT_TransmitHandle *th;
130 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
133 * Pending messages to send to the service
136 struct PendingMessage * pending_head;
137 struct PendingMessage * pending_tail;
140 * Should we reconnect to service due to some serious error?
146 * Pending namestore queue entries
148 struct GNUNET_NAMESTORE_QueueEntry * op_head;
149 struct GNUNET_NAMESTORE_QueueEntry * op_tail;
154 * Pending namestore zone iterator entries
156 struct GNUNET_NAMESTORE_ZoneIterator * z_head;
157 struct GNUNET_NAMESTORE_ZoneIterator * z_tail;
160 struct GNUNET_NAMESTORE_SimpleRecord
165 struct GNUNET_NAMESTORE_SimpleRecord *next;
170 struct GNUNET_NAMESTORE_SimpleRecord *prev;
173 const GNUNET_HashCode *zone;
174 uint32_t record_type;
175 struct GNUNET_TIME_Absolute expiration;
176 enum GNUNET_NAMESTORE_RecordFlags flags;
183 * Disconnect from service and then reconnect.
185 * @param h our handle
188 force_reconnect (struct GNUNET_NAMESTORE_Handle *h);
191 handle_lookup_name_response (struct GNUNET_NAMESTORE_QueueEntry *qe,
192 struct LookupNameResponseMessage * msg,
195 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' \n",
196 "LOOKUP_NAME_RESPONSE");
198 struct GNUNET_NAMESTORE_Handle *h = qe->nsh;
199 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key;
201 struct GNUNET_NAMESTORE_RecordData *rd = NULL;
202 struct GNUNET_CRYPTO_RsaSignature *signature = NULL;
203 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded dummy;
204 struct GNUNET_TIME_Absolute expire;
205 unsigned int rd_count = 0;
208 int contains_sig = GNUNET_NO;
210 rd_count = ntohl (msg->rc_count);
211 msg_len = ntohs (msg->header.size);
212 name_len = ntohs (msg->name_len);
213 contains_sig = ntohs (msg->contains_sig);
214 expire = GNUNET_TIME_absolute_ntoh(msg->expire);
216 if (msg_len != sizeof (struct LookupNameResponseMessage) +
217 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
219 rd_count * sizeof (struct GNUNET_NAMESTORE_RecordData) +
220 contains_sig * sizeof (struct GNUNET_CRYPTO_RsaSignature))
226 zone_key = (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *) &msg[1];
227 name = (char *) &zone_key[1];
228 rd = (struct GNUNET_NAMESTORE_RecordData *) &name[name_len];
230 /* reset values if values not contained */
231 if (contains_sig == GNUNET_NO)
234 signature = (struct GNUNET_CRYPTO_RsaSignature *) &rd[rd_count];
240 memset (&dummy, '0', sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
241 if (0 == memcmp (zone_key, &dummy, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)))
244 if (qe->proc != NULL)
246 qe->proc (qe->proc_cls, zone_key, expire, name, rd_count, rd, signature);
248 /* Operation done, remove */
249 GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe);
255 handle_record_put_response (struct GNUNET_NAMESTORE_QueueEntry *qe,
256 struct RecordPutResponseMessage* msg,
259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' \n",
260 "RECORD_PUT_RESPONSE");
262 struct GNUNET_NAMESTORE_Handle *h = qe->nsh;
265 if (ntohs (msg->op_result) == GNUNET_OK)
268 if (qe->cont != NULL)
270 qe->cont (qe->cont_cls, res, _("Namestore added record successfully"));
274 else if (ntohs (msg->op_result) == GNUNET_NO)
277 if (qe->cont != NULL)
279 qe->cont (qe->cont_cls, res, _("Namestore failed to add record"));
289 /* Operation done, remove */
290 GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe);
297 * Type of a function to call when we receive a message
300 * @param cls the 'struct GNUNET_NAMESTORE_SchedulingHandle'
301 * @param msg message received, NULL on timeout or fatal error
304 process_namestore_message (void *cls, const struct GNUNET_MessageHeader *msg)
306 struct GNUNET_NAMESTORE_Handle *h = cls;
307 struct GenericMessage * gm;
308 struct GNUNET_NAMESTORE_QueueEntry *qe;
311 uint32_t op_id = UINT32_MAX;
319 size = ntohs (msg->size);
320 type = ntohs (msg->type);
322 if (size < sizeof (struct GenericMessage))
325 GNUNET_CLIENT_receive (h->client, &process_namestore_message, h,
326 GNUNET_TIME_UNIT_FOREVER_REL);
330 gm = (struct GenericMessage *) msg;
331 op_id = ntohl (gm->op_id);
333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message type %i size %i op %u\n", type, size, op_id);
335 /* Find matching operation */
336 if (op_id > h->op_id)
338 /* No matching pending operation found */
340 GNUNET_CLIENT_receive (h->client, &process_namestore_message, h,
341 GNUNET_TIME_UNIT_FOREVER_REL);
344 for (qe = h->op_head; qe != NULL; qe = qe->next)
346 if (qe->op_id == op_id)
351 /* No matching pending operation found */
353 GNUNET_CLIENT_receive (h->client, &process_namestore_message, h,
354 GNUNET_TIME_UNIT_FOREVER_REL);
358 /* handle different message type */
360 case GNUNET_MESSAGE_TYPE_NAMESTORE_LOOKUP_NAME_RESPONSE:
361 if (size < sizeof (struct LookupNameResponseMessage))
366 handle_lookup_name_response (qe, (struct LookupNameResponseMessage *) msg, size);
368 case GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_PUT_RESPONSE:
369 if (size != sizeof (struct RecordPutResponseMessage))
374 handle_record_put_response (qe, (struct RecordPutResponseMessage *) msg, size);
381 GNUNET_CLIENT_receive (h->client, &process_namestore_message, h,
382 GNUNET_TIME_UNIT_FOREVER_REL);
384 if (GNUNET_YES == h->reconnect)
390 * Transmit messages from the message queue to the service
391 * (if there are any, and if we are not already trying).
393 * @param h handle to use
396 do_transmit (struct GNUNET_NAMESTORE_Handle *h);
400 * We can now transmit a message to NAMESTORE. Do it.
402 * @param cls the 'struct GNUNET_NAMESTORE_Handle'
403 * @param size number of bytes we can transmit
404 * @param buf where to copy the messages
405 * @return number of bytes copied into buf
408 transmit_message_to_namestore (void *cls, size_t size, void *buf)
410 struct GNUNET_NAMESTORE_Handle *h = cls;
411 struct PendingMessage *p;
416 if ((size == 0) || (buf == NULL))
423 while ((NULL != (p = h->pending_head)) && (p->size <= size))
425 memcpy (&cbuf[ret], &p[1], p->size);
428 GNUNET_CONTAINER_DLL_remove (h->pending_head, h->pending_tail, p);
429 if (GNUNET_YES == p->is_init)
430 GNUNET_CLIENT_receive (h->client, &process_namestore_message, h,
431 GNUNET_TIME_UNIT_FOREVER_REL);
440 * Transmit messages from the message queue to the service
441 * (if there are any, and if we are not already trying).
443 * @param h handle to use
446 do_transmit (struct GNUNET_NAMESTORE_Handle *h)
448 struct PendingMessage *p;
452 if (NULL == (p = h->pending_head))
454 if (NULL == h->client)
455 return; /* currently reconnecting */
457 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, p->size,
458 GNUNET_TIME_UNIT_FOREVER_REL,
459 GNUNET_NO, &transmit_message_to_namestore,
465 * Reconnect to namestore service.
467 * @param h the handle to the namestore service
470 reconnect (struct GNUNET_NAMESTORE_Handle *h)
472 struct PendingMessage *p;
473 struct StartMessage *init;
475 GNUNET_assert (NULL == h->client);
476 h->client = GNUNET_CLIENT_connect ("namestore", h->cfg);
477 GNUNET_assert (NULL != h->client);
479 if ((NULL == (p = h->pending_head)) || (GNUNET_YES != p->is_init))
481 p = GNUNET_malloc (sizeof (struct PendingMessage) +
482 sizeof (struct StartMessage));
483 p->size = sizeof (struct StartMessage);
484 p->is_init = GNUNET_YES;
485 init = (struct StartMessage *) &p[1];
486 init->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_START);
487 init->header.size = htons (sizeof (struct StartMessage));
488 GNUNET_CONTAINER_DLL_insert (h->pending_head, h->pending_tail, p);
494 * Re-establish the connection to the service.
496 * @param cls handle to use to re-connect.
497 * @param tc scheduler context
500 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
502 struct GNUNET_NAMESTORE_Handle *h = cls;
504 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
510 * Disconnect from service and then reconnect.
512 * @param h our handle
515 force_reconnect (struct GNUNET_NAMESTORE_Handle *h)
517 h->reconnect = GNUNET_NO;
518 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
520 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
526 get_op_id (struct GNUNET_NAMESTORE_Handle *h)
528 uint32_t op_id = h->op_id;
534 * Initialize the connection with the NAMESTORE service.
536 * @param cfg configuration to use
537 * @return handle to the GNS service, or NULL on error
539 struct GNUNET_NAMESTORE_Handle *
540 GNUNET_NAMESTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
542 struct GNUNET_NAMESTORE_Handle *h;
544 h = GNUNET_malloc (sizeof (struct GNUNET_NAMESTORE_Handle));
546 h->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect_task, h);
553 GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h, int drop)
555 struct PendingMessage *p;
556 struct GNUNET_NAMESTORE_QueueEntry *q;
557 struct GNUNET_NAMESTORE_ZoneIterator *z;
559 GNUNET_assert (h != NULL);
561 while (NULL != (p = h->pending_head))
563 GNUNET_CONTAINER_DLL_remove (h->pending_head, h->pending_tail, p);
567 while (NULL != (q = h->op_head))
569 GNUNET_CONTAINER_DLL_remove (h->op_head, h->op_tail, q);
573 while (NULL != (z = h->z_head))
575 GNUNET_CONTAINER_DLL_remove (h->z_head, h->z_tail, z);
579 if (NULL != h->client)
581 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
584 if (GNUNET_SCHEDULER_NO_TASK != h->reconnect_task)
586 GNUNET_SCHEDULER_cancel (h->reconnect_task);
587 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
595 * Store an item in the namestore. If the item is already present,
596 * the expiration time is updated to the max of the existing time and
597 * the new time. This API is used when we cache signatures from other
600 * @param h handle to the namestore
601 * @param zone_key public key of the zone
602 * @param name name that is being mapped (at most 255 characters long)
603 * @param expire when does the corresponding block in the DHT expire (until
604 * when should we never do a DHT lookup for the same name again)?
605 * @param rd_count number of entries in 'rd' array
606 * @param rd array of records with data to store
607 * @param signature signature for all the records in the zone under the given name
608 * @param cont continuation to call when done
609 * @param cont_cls closure for cont
610 * @return handle to abort the request
612 struct GNUNET_NAMESTORE_QueueEntry *
613 GNUNET_NAMESTORE_record_put (struct GNUNET_NAMESTORE_Handle *h,
614 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key,
616 struct GNUNET_TIME_Absolute expire,
617 unsigned int rd_count,
618 const struct GNUNET_NAMESTORE_RecordData *rd,
619 const struct GNUNET_CRYPTO_RsaSignature *signature,
620 GNUNET_NAMESTORE_ContinuationWithStatus cont,
623 struct GNUNET_NAMESTORE_QueueEntry *qe;
624 struct PendingMessage *pe;
626 /* pointer to elements */
627 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key_tmp;
628 struct GNUNET_NAMESTORE_RecordData *rd_tmp;
632 size_t name_len = strlen(name) + 1;
635 GNUNET_assert (NULL != h);
637 qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
640 qe->cont_cls = cont_cls;
642 GNUNET_CONTAINER_DLL_insert(h->op_head, h->op_tail, qe);
645 struct RecordPutMessage * msg;
646 msg_size = sizeof (struct RecordPutMessage) + sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + name_len + rd_count * (sizeof (struct GNUNET_NAMESTORE_RecordData));
648 /* create msg here */
649 pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size);
651 pe->is_init = GNUNET_NO;
652 msg = (struct RecordPutMessage *) &pe[1];
653 zone_key_tmp = (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *) &msg[1];
654 name_tmp = (char *) &zone_key_tmp[1];
655 rd_tmp = (struct GNUNET_NAMESTORE_RecordData *) &name_tmp[name_len];
657 msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_PUT);
658 msg->header.size = htons (msg_size);
659 msg->op_id = htonl (id);
660 memcpy (zone_key_tmp, zone_key, sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
661 msg->signature = *signature;
662 msg->name_len = htons (name_len);
663 memcpy (name_tmp, name, name_len);
664 msg->expire = GNUNET_TIME_absolute_hton (expire);
665 msg->rd_count = htonl(rd_count);
666 memcpy (rd_tmp, rd, rd_count * (sizeof (struct GNUNET_NAMESTORE_RecordData)));
668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s' with size %u\n", "NAMESTORE_RECORD_PUT", name, msg_size);
670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CALC: %u %u %u %u\n",
671 sizeof (struct RecordPutMessage),
672 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
674 rd_count * (sizeof (struct GNUNET_NAMESTORE_RecordData)));
676 GNUNET_CONTAINER_DLL_insert (h->pending_head, h->pending_tail, pe);
684 * Check if a signature is valid. This API is used by the GNS Block
685 * to validate signatures received from the network.
687 * @param public_key public key of the zone
688 * @param name name that is being mapped (at most 255 characters long)
689 * @param rd_count number of entries in 'rd' array
690 * @param rd array of records with data to store
691 * @param signature signature for all the records in the zone under the given name
692 * @return GNUNET_OK if the signature is valid
695 GNUNET_NAMESTORE_verify_signature (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
697 unsigned int rd_count,
698 const struct GNUNET_NAMESTORE_RecordData *rd,
699 const struct GNUNET_CRYPTO_RsaSignature *signature)
701 return GNUNET_SYSERR;
705 * Store an item in the namestore. If the item is already present,
706 * the expiration time is updated to the max of the existing time and
707 * the new time. This API is used by the authority of a zone.
709 * @param h handle to the namestore
710 * @param pkey private key of the zone
711 * @param name name that is being mapped (at most 255 characters long)
712 * @param rd record data to store
713 * @param cont continuation to call when done
714 * @param cont_cls closure for cont
715 * @return handle to abort the request
717 struct GNUNET_NAMESTORE_QueueEntry *
718 GNUNET_NAMESTORE_record_create (struct GNUNET_NAMESTORE_Handle *h,
719 const struct GNUNET_CRYPTO_RsaPrivateKey *pkey,
721 const struct GNUNET_NAMESTORE_RecordData *rd,
722 GNUNET_NAMESTORE_ContinuationWithStatus cont,
725 struct GNUNET_NAMESTORE_QueueEntry *qe;
726 struct PendingMessage *pe;
729 GNUNET_assert (NULL != h);
731 qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
734 qe->cont_cls = cont_cls;
738 pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size);
740 /* create msg here */
742 GNUNET_CONTAINER_DLL_insert (h->pending_head, h->pending_tail, pe);
749 * Explicitly remove some content from the database. The
750 * "cont"inuation will be called with status "GNUNET_OK" if content
751 * was removed, "GNUNET_NO" if no matching entry was found and
752 * "GNUNET_SYSERR" on all other types of errors.
753 * This API is used by the authority of a zone.
755 * @param h handle to the namestore
756 * @param pkey private key of the zone
757 * @param name name that is being mapped (at most 255 characters long)
758 * @param rd record data
759 * @param cont continuation to call when done
760 * @param cont_cls closure for cont
761 * @return handle to abort the request
763 struct GNUNET_NAMESTORE_QueueEntry *
764 GNUNET_NAMESTORE_record_remove (struct GNUNET_NAMESTORE_Handle *h,
765 const struct GNUNET_CRYPTO_RsaPrivateKey *pkey,
767 const struct GNUNET_NAMESTORE_RecordData *rd,
768 GNUNET_NAMESTORE_ContinuationWithStatus cont,
771 struct GNUNET_NAMESTORE_QueueEntry *qe;
772 struct PendingMessage *pe;
775 GNUNET_assert (NULL != h);
777 qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
780 qe->cont_cls = cont_cls;
784 pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size);
786 /* create msg here */
788 GNUNET_CONTAINER_DLL_insert (h->pending_head, h->pending_tail, pe);
792 struct GNUNET_NAMESTORE_SimpleRecord *iter;
793 for (iter=h->records_head; iter != NULL; iter=iter->next)
795 if (strcmp ( iter->name, name ) &&
796 iter->record_type == record_type &&
797 GNUNET_CRYPTO_hash_cmp (iter->zone, zone))
801 GNUNET_CONTAINER_DLL_remove(h->records_head,
810 * Get a result for a particular key from the namestore. The processor
811 * will only be called once.
813 * @param h handle to the namestore
814 * @param zone zone to look up a record from
815 * @param name name to look up
816 * @param record_type desired record type, 0 for all
817 * @param proc function to call on the matching records, or with
818 * NULL (rd_count == 0) if there are no matching records
819 * @param proc_cls closure for proc
820 * @return a handle that can be used to
823 struct GNUNET_NAMESTORE_QueueEntry *
824 GNUNET_NAMESTORE_lookup_record (struct GNUNET_NAMESTORE_Handle *h,
825 const GNUNET_HashCode *zone,
827 uint32_t record_type,
828 GNUNET_NAMESTORE_RecordProcessor proc, void *proc_cls)
830 struct GNUNET_NAMESTORE_QueueEntry *qe;
831 struct PendingMessage *pe;
836 GNUNET_assert (NULL != h);
837 GNUNET_assert (NULL != zone);
838 GNUNET_assert (NULL != name);
840 name_len = strlen (name) + 1;
841 if ((name_len == 0) || (name_len > 256))
848 qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
851 qe->proc_cls = proc_cls;
853 GNUNET_CONTAINER_DLL_insert(h->op_head, h->op_tail, qe);
856 msg_size = sizeof (struct LookupNameMessage) + name_len;
857 pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size);
859 /* create msg here */
860 struct LookupNameMessage * msg;
862 pe->is_init = GNUNET_NO;
863 msg = (struct LookupNameMessage *) &pe[1];
864 msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_LOOKUP_NAME);
865 msg->header.size = htons (msg_size);
866 msg->op_id = htonl (id);
867 msg->record_type = htonl (record_type);
869 msg->name_len = htonl (name_len);
870 memcpy (&msg[1], name, name_len);
872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s'\n", "NAMESTORE_LOOKUP_NAME", name);
874 /* transmit message */
875 GNUNET_CONTAINER_DLL_insert (h->pending_head, h->pending_tail, pe);
884 * Starts a new zone iteration (used to periodically PUT all of our
885 * records into our DHT). This MUST lock the GNUNET_NAMESTORE_Handle
886 * for any other calls than GNUNET_NAMESTORE_zone_iterator_next and
887 * GNUNET_NAMESTORE_zone_iteration_stop. "proc" will be called once
888 * immediately, and then again after
889 * "GNUNET_NAMESTORE_zone_iterator_next" is invoked.
891 * @param h handle to the namestore
892 * @param zone zone to access, NULL for all zones
893 * @param must_have_flags flags that must be set for the record to be returned
894 * @param must_not_have_flags flags that must NOT be set for the record to be returned
895 * @param proc function to call on each name from the zone; it
896 * will be called repeatedly with a value (if available)
897 * and always once at the end with a name of NULL.
898 * @param proc_cls closure for proc
899 * @return an iterator handle to use for iteration
901 struct GNUNET_NAMESTORE_ZoneIterator *
902 GNUNET_NAMESTORE_zone_iteration_start (struct GNUNET_NAMESTORE_Handle *h,
903 const GNUNET_HashCode *zone,
904 enum GNUNET_NAMESTORE_RecordFlags must_have_flags,
905 enum GNUNET_NAMESTORE_RecordFlags must_not_have_flags,
906 GNUNET_NAMESTORE_RecordProcessor proc,
909 struct GNUNET_NAMESTORE_ZoneIterator *it;
911 GNUNET_assert (h != NULL);
913 it = GNUNET_malloc (sizeof (struct GNUNET_NAMESTORE_ZoneIterator));
917 GNUNET_CONTAINER_DLL_insert(h->z_head, h->z_tail, it);
924 * Calls the record processor specified in GNUNET_NAMESTORE_zone_iteration_start
925 * for the next record.
927 * @param it the iterator
930 GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it)
937 * Stops iteration and releases the namestore handle for further calls.
939 * @param it the iterator
942 GNUNET_NAMESTORE_zone_iteration_stop (struct GNUNET_NAMESTORE_ZoneIterator *it)
944 struct GNUNET_NAMESTORE_Handle * h;
945 GNUNET_assert (it != NULL);
948 GNUNET_CONTAINER_DLL_remove (h->z_head, h->z_tail, it);
955 * Cancel a namestore operation. The final callback from the
956 * operation must not have been done yet.
958 * @param qe operation to cancel
961 GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe)
963 struct GNUNET_NAMESTORE_Handle *h = qe->nsh;
965 GNUNET_assert (qe != NULL);
967 GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe);
972 /* end of namestore_api.c */