aboutsummaryrefslogtreecommitdiff
path: root/src/dht/gnunet-service-wdht_clients.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/dht/gnunet-service-wdht_clients.c')
-rw-r--r--src/dht/gnunet-service-wdht_clients.c1449
1 files changed, 1449 insertions, 0 deletions
diff --git a/src/dht/gnunet-service-wdht_clients.c b/src/dht/gnunet-service-wdht_clients.c
new file mode 100644
index 000000000..2e4d4ef0a
--- /dev/null
+++ b/src/dht/gnunet-service-wdht_clients.c
@@ -0,0 +1,1449 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
4
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.
9
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.
14
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.
19*/
20
21/**
22 * @file dht/gnunet-service-dht_clients.c
23 * @brief GNUnet DHT service's client management code
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 */
27
28#include "platform.h"
29#include "gnunet_constants.h"
30#include "gnunet_protocols.h"
31#include "gnunet_statistics_service.h"
32#include "gnunet-service-wdht.h"
33#include "gnunet-service-wdht_clients.h"
34#include "gnunet-service-wdht_datacache.h"
35#include "gnunet-service-wdht_neighbours.h"
36#include "dht.h"
37
38
39/**
40 * Should routing details be logged to stderr (for debugging)?
41 */
42#define LOG_TRAFFIC(kind,...) GNUNET_log_from (kind, "dht-traffic",__VA_ARGS__)
43
44#define LOG(kind,...) GNUNET_log_from (kind, "dht-clients",__VA_ARGS__)
45
46#define DEBUG(...) \
47 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
48
49/**
50 * Linked list of messages to send to clients.
51 */
52struct PendingMessage
53{
54 /**
55 * Pointer to next item in the list
56 */
57 struct PendingMessage *next;
58
59 /**
60 * Pointer to previous item in the list
61 */
62 struct PendingMessage *prev;
63
64 /**
65 * Actual message to be sent, allocated at the end of the struct:
66 * // msg = (cast) &pm[1];
67 * // memcpy (&pm[1], data, len);
68 */
69 const struct GNUNET_MessageHeader *msg;
70
71};
72
73
74/**
75 * Struct containing information about a client,
76 * handle to connect to it, and any pending messages
77 * that need to be sent to it.
78 */
79struct ClientList
80{
81 /**
82 * Linked list of active clients
83 */
84 struct ClientList *next;
85
86 /**
87 * Linked list of active clients
88 */
89 struct ClientList *prev;
90
91 /**
92 * The handle to this client
93 */
94 struct GNUNET_SERVER_Client *client_handle;
95
96 /**
97 * Handle to the current transmission request, NULL
98 * if none pending.
99 */
100 struct GNUNET_SERVER_TransmitHandle *transmit_handle;
101
102 /**
103 * Linked list of pending messages for this client
104 */
105 struct PendingMessage *pending_head;
106
107 /**
108 * Tail of linked list of pending messages for this client
109 */
110 struct PendingMessage *pending_tail;
111
112};
113
114
115/**
116 * Entry in the local forwarding map for a client's GET request.
117 */
118struct ClientQueryRecord
119{
120
121 /**
122 * The key this request was about
123 */
124 struct GNUNET_HashCode key;
125
126 /**
127 * Client responsible for the request.
128 */
129 struct ClientList *client;
130
131 /**
132 * Extended query (see gnunet_block_lib.h), allocated at the end of this struct.
133 */
134 const void *xquery;
135
136 /**
137 * Replies we have already seen for this request.
138 */
139 struct GNUNET_HashCode *seen_replies;
140
141 /**
142 * Pointer to this nodes heap location in the retry-heap (for fast removal)
143 */
144 struct GNUNET_CONTAINER_HeapNode *hnode;
145
146 /**
147 * What's the delay between re-try operations that we currently use for this
148 * request?
149 */
150 struct GNUNET_TIME_Relative retry_frequency;
151
152 /**
153 * What's the next time we should re-try this request?
154 */
155 struct GNUNET_TIME_Absolute retry_time;
156
157 /**
158 * The unique identifier of this request
159 */
160 uint64_t unique_id;
161
162 /**
163 * Number of bytes in xquery.
164 */
165 size_t xquery_size;
166
167 /**
168 * Number of entries in 'seen_replies'.
169 */
170 unsigned int seen_replies_count;
171
172 /**
173 * Desired replication level
174 */
175 uint32_t replication;
176
177 /**
178 * Any message options for this request
179 */
180 uint32_t msg_options;
181
182 /**
183 * The type for the data for the GET request.
184 */
185 enum GNUNET_BLOCK_Type type;
186
187};
188
189
190/**
191 * Struct containing paremeters of monitoring requests.
192 */
193struct ClientMonitorRecord
194{
195
196 /**
197 * Next element in DLL.
198 */
199 struct ClientMonitorRecord *next;
200
201 /**
202 * Previous element in DLL.
203 */
204 struct ClientMonitorRecord *prev;
205
206 /**
207 * Type of blocks that are of interest
208 */
209 enum GNUNET_BLOCK_Type type;
210
211 /**
212 * Key of data of interest, NULL for all.
213 */
214 struct GNUNET_HashCode *key;
215
216 /**
217 * Flag whether to notify about GET messages.
218 */
219 int16_t get;
220
221 /**
222 * Flag whether to notify about GET_REPONSE messages.
223 */
224 int16_t get_resp;
225
226 /**
227 * Flag whether to notify about PUT messages.
228 */
229 uint16_t put;
230
231 /**
232 * Client to notify of these requests.
233 */
234 struct ClientList *client;
235};
236
237
238/**
239 * List of active clients.
240 */
241static struct ClientList *client_head;
242
243/**
244 * List of active clients.
245 */
246static struct ClientList *client_tail;
247
248/**
249 * List of active monitoring requests.
250 */
251static struct ClientMonitorRecord *monitor_head;
252
253/**
254 * List of active monitoring requests.
255 */
256static struct ClientMonitorRecord *monitor_tail;
257
258/**
259 * Hashmap for fast key based lookup, maps keys to `struct ClientQueryRecord` entries.
260 */
261static struct GNUNET_CONTAINER_MultiHashMap *forward_map;
262
263/**
264 * Heap with all of our client's request, sorted by retry time (earliest on top).
265 */
266static struct GNUNET_CONTAINER_Heap *retry_heap;
267
268/**
269 * Task that re-transmits requests (using retry_heap).
270 */
271static struct GNUNET_SCHEDULER_Task * retry_task;
272
273
274/**
275 * Task run to check for messages that need to be sent to a client.
276 *
277 * @param client a ClientList, containing the client and any messages to be sent to it
278 */
279static void
280process_pending_messages (struct ClientList *client);
281
282
283/**
284 * Callback called as a result of issuing a GNUNET_SERVER_notify_transmit_ready
285 * request. A ClientList is passed as closure, take the head of the list
286 * and copy it into buf, which has the result of sending the message to the
287 * client.
288 *
289 * @param cls closure to this call
290 * @param size maximum number of bytes available to send
291 * @param buf where to copy the actual message to
292 *
293 * @return the number of bytes actually copied, 0 indicates failure
294 */
295static size_t
296send_reply_to_client (void *cls, size_t size, void *buf)
297{
298 struct ClientList *client = cls;
299 char *cbuf = buf;
300 struct PendingMessage *reply;
301 size_t off;
302 size_t msize;
303
304 client->transmit_handle = NULL;
305 if (buf == NULL)
306 {
307 /* client disconnected */
308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
309 "Client %p disconnected, pending messages will be discarded\n",
310 client->client_handle);
311 return 0;
312 }
313 off = 0;
314 while ((NULL != (reply = client->pending_head)) &&
315 (size >= off + (msize = ntohs (reply->msg->size))))
316 {
317 GNUNET_CONTAINER_DLL_remove (client->pending_head, client->pending_tail,
318 reply);
319 memcpy (&cbuf[off], reply->msg, msize);
320 GNUNET_free (reply);
321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to client %p\n",
322 msize, client->client_handle);
323 off += msize;
324 }
325 process_pending_messages (client);
326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitted %u/%u bytes to client %p\n",
327 (unsigned int) off, (unsigned int) size, client->client_handle);
328 return off;
329}
330
331
332/**
333 * Task run to check for messages that need to be sent to a client.
334 *
335 * @param client a ClientList, containing the client and any messages to be sent to it
336 */
337static void
338process_pending_messages (struct ClientList *client)
339{
340 if ((client->pending_head == NULL) || (client->transmit_handle != NULL))
341 {
342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
343 "Not asking for transmission to %p now: %s\n",
344 client->client_handle,
345 client->pending_head ==
346 NULL ? "no more messages" : "request already pending");
347 return;
348 }
349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
350 "Asking for transmission of %u bytes to client %p\n",
351 ntohs (client->pending_head->msg->size), client->client_handle);
352 client->transmit_handle =
353 GNUNET_SERVER_notify_transmit_ready (client->client_handle,
354 ntohs (client->pending_head->
355 msg->size),
356 GNUNET_TIME_UNIT_FOREVER_REL,
357 &send_reply_to_client, client);
358}
359
360
361/**
362 * Add a PendingMessage to the clients list of messages to be sent
363 *
364 * @param client the active client to send the message to
365 * @param pending_message the actual message to send
366 */
367static void
368add_pending_message (struct ClientList *client,
369 struct PendingMessage *pending_message)
370{
371 GNUNET_CONTAINER_DLL_insert_tail (client->pending_head, client->pending_tail,
372 pending_message);
373 process_pending_messages (client);
374}
375
376
377/**
378 * Closure for 'forward_reply'
379 */
380struct ForwardReplyContext
381{
382
383 /**
384 * Actual message to send to matching clients.
385 */
386 struct PendingMessage *pm;
387
388 /**
389 * Embedded payload.
390 */
391 const void *data;
392
393 /**
394 * Type of the data.
395 */
396 enum GNUNET_BLOCK_Type type;
397
398 /**
399 * Number of bytes in data.
400 */
401 size_t data_size;
402
403 /**
404 * Do we need to copy 'pm' because it was already used?
405 */
406 int do_copy;
407
408};
409
410
411/**
412 * Find a client if it exists, add it otherwise.
413 *
414 * @param client the server handle to the client
415 *
416 * @return the client if found, a new client otherwise
417 */
418static struct ClientList *
419find_active_client (struct GNUNET_SERVER_Client *client)
420{
421 struct ClientList *pos = client_head;
422 struct ClientList *ret;
423
424 while (pos != NULL)
425 {
426 if (pos->client_handle == client)
427 return pos;
428 pos = pos->next;
429 }
430 ret = GNUNET_new (struct ClientList);
431 ret->client_handle = client;
432 GNUNET_CONTAINER_DLL_insert (client_head, client_tail, ret);
433 return ret;
434}
435
436
437/**
438 * Iterator over hash map entries that frees all entries
439 * associated with the given client.
440 *
441 * @param cls client to search for in source routes
442 * @param key current key code (ignored)
443 * @param value value in the hash map, a ClientQueryRecord
444 * @return #GNUNET_YES (we should continue to iterate)
445 */
446static int
447remove_client_records (void *cls, const struct GNUNET_HashCode * key, void *value)
448{
449 struct ClientList *client = cls;
450 struct ClientQueryRecord *record = value;
451
452 if (record->client != client)
453 return GNUNET_YES;
454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
455 "Removing client %p's record for key %s\n", client,
456 GNUNET_h2s (key));
457 GNUNET_assert (GNUNET_YES ==
458 GNUNET_CONTAINER_multihashmap_remove (forward_map, key,
459 record));
460 if (NULL != record->hnode)
461 GNUNET_CONTAINER_heap_remove_node (record->hnode);
462 GNUNET_array_grow (record->seen_replies, record->seen_replies_count, 0);
463 GNUNET_free (record);
464 return GNUNET_YES;
465}
466
467
468/**
469 * Iterator over hash map entries that send a given reply to
470 * each of the matching clients. With some tricky recycling
471 * of the buffer.
472 *
473 * @param cls the 'struct ForwardReplyContext'
474 * @param key current key
475 * @param value value in the hash map, a ClientQueryRecord
476 * @return GNUNET_YES (we should continue to iterate),
477 * if the result is mal-formed, GNUNET_NO
478 */
479static int
480forward_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
481{
482 struct ForwardReplyContext *frc = cls;
483 struct ClientQueryRecord *record = value;
484 struct PendingMessage *pm;
485 struct GNUNET_DHT_ClientResultMessage *reply;
486 enum GNUNET_BLOCK_EvaluationResult eval;
487 int do_free;
488 struct GNUNET_HashCode ch;
489 unsigned int i;
490
491 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
492 "XVINE CLIENT-RESULT %s\n",
493 GNUNET_h2s_full (key));
494#if 0
495 if ((record->type != GNUNET_BLOCK_TYPE_ANY) && (record->type != frc->type))
496 {
497 LOG (GNUNET_ERROR_TYPE_DEBUG,
498 "Record type missmatch, not passing request for key %s to local client\n",
499 GNUNET_h2s (key));
500
501 GNUNET_STATISTICS_update (GDS_stats,
502 gettext_noop
503 ("# Key match, type mismatches in REPLY to CLIENT"),
504 1, GNUNET_NO);
505 return GNUNET_YES; /* type mismatch */
506 }
507#endif
508 GNUNET_CRYPTO_hash (frc->data, frc->data_size, &ch);
509 for (i = 0; i < record->seen_replies_count; i++)
510 if (0 == memcmp (&record->seen_replies[i], &ch, sizeof (struct GNUNET_HashCode)))
511 {
512 LOG (GNUNET_ERROR_TYPE_DEBUG,
513 "Duplicate reply, not passing request for key %s to local client\n",
514 GNUNET_h2s (key));
515 GNUNET_STATISTICS_update (GDS_stats,
516 gettext_noop
517 ("# Duplicate REPLIES to CLIENT request dropped"),
518 1, GNUNET_NO);
519 return GNUNET_YES; /* duplicate */
520 }
521 eval =
522 GNUNET_BLOCK_evaluate (GDS_block_context,
523 record->type,
524 GNUNET_BLOCK_EO_NONE,
525 key, NULL, 0,
526 record->xquery,
527 record->xquery_size,
528 frc->data,
529 frc->data_size);
530 LOG (GNUNET_ERROR_TYPE_DEBUG,
531 "Evaluation result is %d for key %s for local client's query\n",
532 (int) eval, GNUNET_h2s (key));
533 switch (eval)
534 {
535 case GNUNET_BLOCK_EVALUATION_OK_LAST:
536 do_free = GNUNET_YES;
537 break;
538 case GNUNET_BLOCK_EVALUATION_OK_MORE:
539 GNUNET_array_append (record->seen_replies, record->seen_replies_count, ch);
540 do_free = GNUNET_NO;
541 break;
542 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
543 /* should be impossible to encounter here */
544 GNUNET_break (0);
545 return GNUNET_YES;
546 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
547 GNUNET_break_op (0);
548 return GNUNET_NO;
549 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
550 GNUNET_break (0);
551 return GNUNET_NO;
552 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
553 GNUNET_break (0);
554 return GNUNET_NO;
555 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
556 return GNUNET_YES;
557 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
558 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
559 _("Unsupported block type (%u) in request!\n"), record->type);
560 return GNUNET_NO;
561 default:
562 GNUNET_break (0);
563 return GNUNET_NO;
564 }
565 if (GNUNET_NO == frc->do_copy)
566 {
567 /* first time, we can use the original data */
568 pm = frc->pm;
569 frc->do_copy = GNUNET_YES;
570 }
571 else
572 {
573 /* two clients waiting for same reply, must copy for queueing */
574 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
575 ntohs (frc->pm->msg->size));
576 memcpy (pm, frc->pm,
577 sizeof (struct PendingMessage) + ntohs (frc->pm->msg->size));
578 pm->next = pm->prev = NULL;
579 pm->msg = (struct GNUNET_MessageHeader *) &pm[1];
580 }
581 GNUNET_STATISTICS_update (GDS_stats,
582 gettext_noop ("# RESULTS queued for clients"), 1,
583 GNUNET_NO);
584 reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
585 reply->unique_id = record->unique_id;
586 LOG (GNUNET_ERROR_TYPE_DEBUG,
587 "Queueing reply to query %s for client %p\n",
588 GNUNET_h2s (key),
589 record->client->client_handle);
590 add_pending_message (record->client, pm);
591 if (GNUNET_YES == do_free)
592 remove_client_records (record->client, key, record);
593 return GNUNET_YES;
594}
595
596
597/**
598 * Handle a reply we've received from another peer. If the reply
599 * matches any of our pending queries, forward it to the respective
600 * client(s).
601 *
602 * @param expiration when will the reply expire
603 * @param key the query this reply is for
604 * @param get_path_length number of peers in @a get_path
605 * @param get_path path the reply took on get
606 * @param put_path_length number of peers in @a put_path
607 * @param put_path path the reply took on put
608 * @param type type of the reply
609 * @param data_size number of bytes in @a data
610 * @param data application payload data
611 */
612void
613GDS_CLIENTS_handle_reply (struct GNUNET_TIME_Absolute expiration,
614 const struct GNUNET_HashCode *key,
615 unsigned int get_path_length,
616 const struct GNUNET_PeerIdentity *get_path,
617 unsigned int put_path_length,
618 const struct GNUNET_PeerIdentity *put_path,
619 enum GNUNET_BLOCK_Type type, size_t data_size,
620 const void *data)
621{
622 struct ForwardReplyContext frc;
623 struct PendingMessage *pm;
624 struct GNUNET_DHT_ClientResultMessage *reply;
625 struct GNUNET_PeerIdentity *paths;
626 size_t msize;
627
628 LOG (GNUNET_ERROR_TYPE_DEBUG,
629 "reply for key %s\n",
630 GNUNET_h2s (key));
631
632 if (NULL == GNUNET_CONTAINER_multihashmap_get (forward_map, key))
633 {
634 GNUNET_STATISTICS_update (GDS_stats,
635 gettext_noop
636 ("# REPLIES ignored for CLIENTS (no match)"), 1,
637 GNUNET_NO);
638 return; /* no matching request, fast exit! */
639 }
640 msize =
641 sizeof (struct GNUNET_DHT_ClientResultMessage) + data_size +
642 (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity);
643 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
644 {
645 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
646 _("Could not pass reply to client, message too big!\n"));
647 return;
648 }
649 DEBUG("reply FOR DATA_SIZE = %lu\n",msize);
650 pm = GNUNET_malloc (msize + sizeof (struct PendingMessage));
651 reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
652 pm->msg = &reply->header;
653 reply->header.size = htons ((uint16_t) msize);
654 reply->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
655 reply->type = htonl (type);
656 reply->get_path_length = htonl (get_path_length);
657 reply->put_path_length = htonl (put_path_length);
658 reply->unique_id = 0; /* filled in later */
659 reply->expiration = GNUNET_TIME_absolute_hton (expiration);
660 reply->key = *key;
661 paths = (struct GNUNET_PeerIdentity *) &reply[1];
662 memcpy (paths, put_path,
663 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
664 memcpy (&paths[put_path_length], get_path,
665 sizeof (struct GNUNET_PeerIdentity) * get_path_length);
666 memcpy (&paths[get_path_length + put_path_length], data, data_size);
667 frc.do_copy = GNUNET_NO;
668 frc.pm = pm;
669 frc.data = data;
670 frc.data_size = data_size;
671 frc.type = type;
672 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, key, &forward_reply,
673 &frc);
674 if (GNUNET_NO == frc.do_copy)
675 {
676 /* did not match any of the requests, free! */
677 GNUNET_STATISTICS_update (GDS_stats,
678 gettext_noop
679 ("# REPLIES ignored for CLIENTS (no match)"), 1,
680 GNUNET_NO);
681 GNUNET_free (pm);
682 }
683}
684
685/**
686 * Check if some client is monitoring GET messages and notify
687 * them in that case.
688 *
689 * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
690 * @param type The type of data in the request.
691 * @param hop_count Hop count so far.
692 * @param path_length number of entries in path (or 0 if not recorded).
693 * @param path peers on the GET path (or NULL if not recorded).
694 * @param desired_replication_level Desired replication level.
695 * @param key Key of the requested data.
696 */
697void
698GDS_CLIENTS_process_get (uint32_t options,
699 enum GNUNET_BLOCK_Type type,
700 uint32_t hop_count,
701 uint32_t desired_replication_level,
702 unsigned int path_length,
703 const struct GNUNET_PeerIdentity *path,
704 const struct GNUNET_HashCode * key)
705{
706 struct ClientMonitorRecord *m;
707 struct ClientList **cl;
708 unsigned int cl_size;
709
710 cl = NULL;
711 cl_size = 0;
712 for (m = monitor_head; NULL != m; m = m->next)
713 {
714 if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
715 (NULL == m->key ||
716 memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
717 {
718 struct PendingMessage *pm;
719 struct GNUNET_DHT_MonitorGetMessage *mmsg;
720 struct GNUNET_PeerIdentity *msg_path;
721 size_t msize;
722 unsigned int i;
723
724 /* Don't send duplicates */
725 for (i = 0; i < cl_size; i++)
726 if (cl[i] == m->client)
727 break;
728 if (i < cl_size)
729 continue;
730 GNUNET_array_append (cl, cl_size, m->client);
731
732 msize = path_length * sizeof (struct GNUNET_PeerIdentity);
733 msize += sizeof (struct GNUNET_DHT_MonitorGetMessage);
734 msize += sizeof (struct PendingMessage);
735 pm = GNUNET_malloc (msize);
736 mmsg = (struct GNUNET_DHT_MonitorGetMessage *) &pm[1];
737 pm->msg = &mmsg->header;
738 mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
739 mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET);
740 mmsg->options = htonl(options);
741 mmsg->type = htonl(type);
742 mmsg->hop_count = htonl(hop_count);
743 mmsg->desired_replication_level = htonl(desired_replication_level);
744 mmsg->get_path_length = htonl(path_length);
745 memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
746 msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
747 if (path_length > 0)
748 memcpy (msg_path, path,
749 path_length * sizeof (struct GNUNET_PeerIdentity));
750 add_pending_message (m->client, pm);
751 }
752 }
753 GNUNET_free_non_null (cl);
754}
755
756
757/**
758 * Check if some client is monitoring PUT messages and notify
759 * them in that case.
760 *
761 * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
762 * @param type The type of data in the request.
763 * @param hop_count Hop count so far.
764 * @param path_length number of entries in path (or 0 if not recorded).
765 * @param path peers on the PUT path (or NULL if not recorded).
766 * @param desired_replication_level Desired replication level.
767 * @param exp Expiration time of the data.
768 * @param key Key under which data is to be stored.
769 * @param data Pointer to the data carried.
770 * @param size Number of bytes in data.
771 */
772void
773GDS_CLIENTS_process_put (uint32_t options,
774 enum GNUNET_BLOCK_Type type,
775 uint32_t hop_count,
776 uint32_t desired_replication_level,
777 unsigned int path_length,
778 const struct GNUNET_PeerIdentity *path,
779 struct GNUNET_TIME_Absolute exp,
780 const struct GNUNET_HashCode * key,
781 const void *data,
782 size_t size)
783{
784 struct ClientMonitorRecord *m;
785 struct ClientList **cl;
786 unsigned int cl_size;
787
788 cl = NULL;
789 cl_size = 0;
790 for (m = monitor_head; NULL != m; m = m->next)
791 {
792 if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
793 (NULL == m->key ||
794 memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
795 {
796 struct PendingMessage *pm;
797 struct GNUNET_DHT_MonitorPutMessage *mmsg;
798 struct GNUNET_PeerIdentity *msg_path;
799 size_t msize;
800 unsigned int i;
801
802 /* Don't send duplicates */
803 for (i = 0; i < cl_size; i++)
804 if (cl[i] == m->client)
805 break;
806 if (i < cl_size)
807 continue;
808 GNUNET_array_append (cl, cl_size, m->client);
809
810 msize = size;
811 msize += path_length * sizeof (struct GNUNET_PeerIdentity);
812 msize += sizeof (struct GNUNET_DHT_MonitorPutMessage);
813 msize += sizeof (struct PendingMessage);
814 pm = GNUNET_malloc (msize);
815 mmsg = (struct GNUNET_DHT_MonitorPutMessage *) &pm[1];
816 pm->msg = (struct GNUNET_MessageHeader *) mmsg;
817 mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
818 mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT);
819 mmsg->options = htonl(options);
820 mmsg->type = htonl(type);
821 mmsg->hop_count = htonl(hop_count);
822 mmsg->desired_replication_level = htonl(desired_replication_level);
823 mmsg->put_path_length = htonl(path_length);
824 msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
825 if (path_length > 0)
826 {
827 memcpy (msg_path, path,
828 path_length * sizeof (struct GNUNET_PeerIdentity));
829 }
830 mmsg->expiration_time = GNUNET_TIME_absolute_hton(exp);
831 memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
832 if (size > 0)
833 memcpy (&msg_path[path_length], data, size);
834 add_pending_message (m->client, pm);
835 }
836 }
837 GNUNET_free_non_null (cl);
838}
839
840
841/**
842 * Route the given request via the DHT.
843 */
844static void
845transmit_request (struct ClientQueryRecord *cqr)
846{
847 GNUNET_STATISTICS_update (GDS_stats,
848 gettext_noop
849 ("# GET requests from clients injected"), 1,
850 GNUNET_NO);
851
852 LOG (GNUNET_ERROR_TYPE_DEBUG,
853 "Initiating GET for %s, replication %u, already have %u replies\n",
854 GNUNET_h2s (&cqr->key),
855 cqr->replication,
856 cqr->seen_replies_count);
857
858 GDS_NEIGHBOURS_handle_get (&cqr->key, cqr->type, cqr->msg_options,
859 cqr->replication);
860
861 /* exponential back-off for retries.
862 * max GNUNET_TIME_STD_EXPONENTIAL_BACKOFF_THRESHOLD (15 min) */
863 cqr->retry_frequency = GNUNET_TIME_STD_BACKOFF (cqr->retry_frequency);
864 cqr->retry_time = GNUNET_TIME_relative_to_absolute (cqr->retry_frequency);
865}
866
867
868/**
869 * Task that looks at the 'retry_heap' and transmits all of the requests
870 * on the heap that are ready for transmission. Then re-schedules
871 * itself (unless the heap is empty).
872 *
873 * @param cls unused
874 * @param tc scheduler context
875 */
876static void
877transmit_next_request_task (void *cls,
878 const struct GNUNET_SCHEDULER_TaskContext *tc)
879{
880 struct ClientQueryRecord *cqr;
881 struct GNUNET_TIME_Relative delay;
882
883 retry_task = NULL;
884 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
885 return;
886 while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
887 {
888 cqr->hnode = NULL;
889 delay = GNUNET_TIME_absolute_get_remaining (cqr->retry_time);
890 if (delay.rel_value_us > 0)
891 {
892 cqr->hnode =
893 GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
894 cqr->retry_time.abs_value_us);
895 retry_task =
896 GNUNET_SCHEDULER_add_delayed (delay, &transmit_next_request_task,
897 NULL);
898 return;
899 }
900 transmit_request (cqr);
901 cqr->hnode =
902 GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
903 cqr->retry_time.abs_value_us);
904 }
905}
906
907
908/**
909 * Handler for PUT messages.
910 *
911 * @param cls closure for the service
912 * @param client the client we received this message from
913 * @param message the actual message received
914 */
915static void
916handle_dht_local_put (void *cls, struct GNUNET_SERVER_Client *client,
917 const struct GNUNET_MessageHeader *message)
918{
919 const struct GNUNET_DHT_ClientPutMessage *put_msg;
920 struct PendingMessage *pm;
921 struct GNUNET_DHT_ClientPutConfirmationMessage *conf;
922 uint16_t size;
923
924 size = ntohs (message->size);
925 if (size < sizeof (struct GNUNET_DHT_ClientPutMessage))
926 {
927 GNUNET_break (0);
928 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
929 return;
930 }
931 GNUNET_STATISTICS_update (GDS_stats,
932 gettext_noop
933 ("# PUT requests received from clients"), 1,
934 GNUNET_NO);
935 put_msg = (const struct GNUNET_DHT_ClientPutMessage *) message;
936 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "X-VINE DHT CLIENT-PUT %s\n",
937 GNUNET_h2s_full (&put_msg->key));
938 /* give to local clients */
939 LOG (GNUNET_ERROR_TYPE_DEBUG,
940 "Handling local PUT of %u-bytes for query %s\n",
941 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
942 GNUNET_h2s (&put_msg->key));
943 DEBUG("PUT doing put i = %s\n",GNUNET_h2s(&(put_msg->key)));
944 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (put_msg->expiration),
945 &put_msg->key, 0, NULL, 0, NULL,
946 ntohl (put_msg->type),
947 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
948 &put_msg[1]);
949
950 GDS_NEIGHBOURS_handle_put (&put_msg->key,
951 ntohl (put_msg->type), ntohl (put_msg->options),
952 ntohl (put_msg->desired_replication_level),
953 GNUNET_TIME_absolute_ntoh (put_msg->expiration),
954 &put_msg[1],
955 size - sizeof (struct GNUNET_DHT_ClientPutMessage));
956 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
957 sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage));
958 conf = (struct GNUNET_DHT_ClientPutConfirmationMessage *) &pm[1];
959 conf->header.size = htons (sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage));
960 conf->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT_OK);
961 conf->reserved = htonl (0);
962 conf->unique_id = put_msg->unique_id;
963 pm->msg = &conf->header;
964 add_pending_message (find_active_client (client), pm);
965 GNUNET_SERVER_receive_done (client, GNUNET_OK);
966}
967
968
969/**
970 * Handler for DHT GET messages from the client.
971 *
972 * @param cls closure for the service
973 * @param client the client we received this message from
974 * @param message the actual message received
975 */
976static void
977handle_dht_local_get (void *cls, struct GNUNET_SERVER_Client *client,
978 const struct GNUNET_MessageHeader *message)
979{
980 const struct GNUNET_DHT_ClientGetMessage *get;
981 struct ClientQueryRecord *cqr;
982 size_t xquery_size;
983 const char *xquery;
984 uint16_t size;
985
986 size = ntohs (message->size);
987 if (size < sizeof (struct GNUNET_DHT_ClientGetMessage))
988 {
989 GNUNET_break (0);
990 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
991 return;
992 }
993 xquery_size = size - sizeof (struct GNUNET_DHT_ClientGetMessage);
994 get = (const struct GNUNET_DHT_ClientGetMessage *) message;
995 xquery = (const char *) &get[1];
996 GNUNET_STATISTICS_update (GDS_stats,
997 gettext_noop
998 ("# GET requests received from clients"), 1,
999 GNUNET_NO);
1000 LOG (GNUNET_ERROR_TYPE_DEBUG,
1001 "Received GET request for %s from local client %p, xq: %.*s\n",
1002 GNUNET_h2s (&get->key), client, xquery_size, xquery);
1003
1004 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "X-VINE CLIENT-GET %s\n",
1005 GNUNET_h2s_full (&get->key));
1006
1007
1008 cqr = GNUNET_malloc (sizeof (struct ClientQueryRecord) + xquery_size);
1009 cqr->key = get->key;
1010 cqr->client = find_active_client (client);
1011 cqr->xquery = (void *) &cqr[1];
1012 memcpy (&cqr[1], xquery, xquery_size);
1013 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr, 0);
1014 cqr->retry_frequency = GNUNET_TIME_UNIT_SECONDS;
1015 cqr->retry_time = GNUNET_TIME_absolute_get ();
1016 cqr->unique_id = get->unique_id;
1017 cqr->xquery_size = xquery_size;
1018 cqr->replication = ntohl (get->desired_replication_level);
1019 cqr->msg_options = ntohl (get->options);
1020 cqr->type = ntohl (get->type);
1021
1022 // FIXME use cqr->key, set multihashmap create to GNUNET_YES
1023 GNUNET_CONTAINER_multihashmap_put (forward_map, &get->key, cqr,
1024 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1025
1026 struct GNUNET_PeerIdentity my_identity;
1027 my_identity = GDS_NEIGHBOURS_get_my_id();
1028 GDS_CLIENTS_process_get (ntohl (get->options),
1029 ntohl (get->type),
1030 0,
1031 ntohl (get->desired_replication_level),
1032 1,
1033 &my_identity,
1034 &get->key);
1035 /* start remote requests */
1036 if (NULL != retry_task)
1037 GNUNET_SCHEDULER_cancel (retry_task);
1038 retry_task = GNUNET_SCHEDULER_add_now (&transmit_next_request_task, NULL);
1039 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1040}
1041
1042
1043/**
1044 * Closure for 'find_by_unique_id'.
1045 */
1046struct FindByUniqueIdContext
1047{
1048 /**
1049 * Where to store the result, if found.
1050 */
1051 struct ClientQueryRecord *cqr;
1052
1053 uint64_t unique_id;
1054};
1055
1056
1057/**
1058 * Function called for each existing DHT record for the given
1059 * query. Checks if it matches the UID given in the closure
1060 * and if so returns the entry as a result.
1061 *
1062 * @param cls the search context
1063 * @param key query for the lookup (not used)
1064 * @param value the 'struct ClientQueryRecord'
1065 * @return GNUNET_YES to continue iteration (result not yet found)
1066 */
1067static int
1068find_by_unique_id (void *cls,
1069 const struct GNUNET_HashCode *key,
1070 void *value)
1071{
1072 struct FindByUniqueIdContext *fui_ctx = cls;
1073 struct ClientQueryRecord *cqr = value;
1074
1075 if (cqr->unique_id != fui_ctx->unique_id)
1076 return GNUNET_YES;
1077 fui_ctx->cqr = cqr;
1078 return GNUNET_NO;
1079}
1080
1081
1082/**
1083 * Handler for "GET result seen" messages from the client.
1084 *
1085 * @param cls closure for the service
1086 * @param client the client we received this message from
1087 * @param message the actual message received
1088 */
1089static void
1090handle_dht_local_get_result_seen (void *cls, struct GNUNET_SERVER_Client *client,
1091 const struct GNUNET_MessageHeader *message)
1092{
1093 const struct GNUNET_DHT_ClientGetResultSeenMessage *seen;
1094 uint16_t size;
1095 unsigned int hash_count;
1096 unsigned int old_count;
1097 const struct GNUNET_HashCode *hc;
1098 struct FindByUniqueIdContext fui_ctx;
1099 struct ClientQueryRecord *cqr;
1100
1101 size = ntohs (message->size);
1102 if (size < sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage))
1103 {
1104 GNUNET_break (0);
1105 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1106 return;
1107 }
1108 seen = (const struct GNUNET_DHT_ClientGetResultSeenMessage *) message;
1109 hash_count = (size - sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage)) / sizeof (struct GNUNET_HashCode);
1110 if (size != sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage) + hash_count * sizeof (struct GNUNET_HashCode))
1111 {
1112 GNUNET_break (0);
1113 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1114 return;
1115 }
1116 hc = (const struct GNUNET_HashCode*) &seen[1];
1117 fui_ctx.unique_id = seen->unique_id;
1118 fui_ctx.cqr = NULL;
1119 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
1120 &seen->key,
1121 &find_by_unique_id,
1122 &fui_ctx);
1123 if (NULL == (cqr = fui_ctx.cqr))
1124 {
1125 GNUNET_break (0);
1126 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1127 return;
1128 }
1129 /* finally, update 'seen' list */
1130 old_count = cqr->seen_replies_count;
1131 GNUNET_array_grow (cqr->seen_replies,
1132 cqr->seen_replies_count,
1133 cqr->seen_replies_count + hash_count);
1134 memcpy (&cqr->seen_replies[old_count],
1135 hc,
1136 sizeof (struct GNUNET_HashCode) * hash_count);
1137}
1138
1139
1140/**
1141 * Closure for 'remove_by_unique_id'.
1142 */
1143struct RemoveByUniqueIdContext
1144{
1145 /**
1146 * Client that issued the removal request.
1147 */
1148 struct ClientList *client;
1149
1150 /**
1151 * Unique ID of the request.
1152 */
1153 uint64_t unique_id;
1154};
1155
1156
1157/**
1158 * Iterator over hash map entries that frees all entries
1159 * that match the given client and unique ID.
1160 *
1161 * @param cls unique ID and client to search for in source routes
1162 * @param key current key code
1163 * @param value value in the hash map, a ClientQueryRecord
1164 * @return GNUNET_YES (we should continue to iterate)
1165 */
1166static int
1167remove_by_unique_id (void *cls, const struct GNUNET_HashCode * key, void *value)
1168{
1169 const struct RemoveByUniqueIdContext *ctx = cls;
1170 struct ClientQueryRecord *record = value;
1171
1172 if (record->unique_id != ctx->unique_id)
1173 return GNUNET_YES;
1174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1175 "Removing client %p's record for key %s (by unique id)\n",
1176 ctx->client->client_handle, GNUNET_h2s (key));
1177 return remove_client_records (ctx->client, key, record);
1178}
1179
1180
1181/**
1182 * Handler for any generic DHT stop messages, calls the appropriate handler
1183 * depending on message type (if processed locally)
1184 *
1185 * @param cls closure for the service
1186 * @param client the client we received this message from
1187 * @param message the actual message received
1188 *
1189 */
1190static void
1191handle_dht_local_get_stop (void *cls, struct GNUNET_SERVER_Client *client,
1192 const struct GNUNET_MessageHeader *message)
1193{
1194 const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg =
1195 (const struct GNUNET_DHT_ClientGetStopMessage *) message;
1196 struct RemoveByUniqueIdContext ctx;
1197
1198 GNUNET_STATISTICS_update (GDS_stats,
1199 gettext_noop
1200 ("# GET STOP requests received from clients"), 1,
1201 GNUNET_NO);
1202 LOG (GNUNET_ERROR_TYPE_DEBUG,
1203 "Received GET STOP request for %s from local client %p\n",
1204 client, GNUNET_h2s (&dht_stop_msg->key));
1205 ctx.client = find_active_client (client);
1206 ctx.unique_id = dht_stop_msg->unique_id;
1207 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, &dht_stop_msg->key,
1208 &remove_by_unique_id, &ctx);
1209 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1210}
1211
1212
1213/**
1214 * Handler for monitor start messages
1215 *
1216 * @param cls closure for the service
1217 * @param client the client we received this message from
1218 * @param message the actual message received
1219 *
1220 */
1221static void
1222handle_dht_local_monitor (void *cls, struct GNUNET_SERVER_Client *client,
1223 const struct GNUNET_MessageHeader *message)
1224{
1225 struct ClientMonitorRecord *r;
1226 const struct GNUNET_DHT_MonitorStartStopMessage *msg;
1227
1228 msg = (struct GNUNET_DHT_MonitorStartStopMessage *) message;
1229 r = GNUNET_new (struct ClientMonitorRecord);
1230
1231 r->client = find_active_client(client);
1232 r->type = ntohl(msg->type);
1233 r->get = ntohs(msg->get);
1234 r->get_resp = ntohs(msg->get_resp);
1235 r->put = ntohs(msg->put);
1236 if (0 == ntohs(msg->filter_key))
1237 r->key = NULL;
1238 else
1239 {
1240 r->key = GNUNET_new (struct GNUNET_HashCode);
1241 memcpy (r->key, &msg->key, sizeof (struct GNUNET_HashCode));
1242 }
1243 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, r);
1244 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1245}
1246
1247
1248/**
1249 * Handler for monitor stop messages
1250 *
1251 * @param cls closure for the service
1252 * @param client the client we received this message from
1253 * @param message the actual message received
1254 *
1255 */
1256static void
1257handle_dht_local_monitor_stop (void *cls, struct GNUNET_SERVER_Client *client,
1258 const struct GNUNET_MessageHeader *message)
1259{
1260 struct ClientMonitorRecord *r;
1261 const struct GNUNET_DHT_MonitorStartStopMessage *msg;
1262 int keys_match;
1263
1264 msg = (struct GNUNET_DHT_MonitorStartStopMessage *) message;
1265 r = monitor_head;
1266
1267 while (NULL != r)
1268 {
1269 if (NULL == r->key)
1270 keys_match = (0 == ntohs(msg->filter_key));
1271 else
1272 {
1273 keys_match = (0 != ntohs(msg->filter_key)
1274 && !memcmp(r->key, &msg->key, sizeof(struct GNUNET_HashCode)));
1275 }
1276 if (find_active_client(client) == r->client
1277 && ntohl(msg->type) == r->type
1278 && r->get == msg->get
1279 && r->get_resp == msg->get_resp
1280 && r->put == msg->put
1281 && keys_match
1282 )
1283 {
1284 GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, r);
1285 GNUNET_free_non_null (r->key);
1286 GNUNET_free (r);
1287 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1288 return; /* Delete only ONE entry */
1289 }
1290 r = r->next;
1291 }
1292
1293 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1294}
1295
1296
1297#if ENABLE_MALICIOUS
1298/**
1299 * Handler for act malicious message.
1300 *
1301 * @param cls closure for the service
1302 * @param client the client we received this message from
1303 * @param message the actual message received
1304 *
1305 */
1306static void
1307handle_dht_act_malicious (void *cls, struct GNUNET_SERVER_Client *client,
1308 const struct GNUNET_MessageHeader *message)
1309{
1310 const struct GNUNET_DHT_ActMaliciousMessage *msg;
1311 struct PendingMessage *pm;
1312 struct GNUNET_DHT_ClientActMaliciousConfirmationMessage *conf;
1313 unsigned int malicious_action;
1314
1315 msg = (const struct GNUNET_DHT_ActMaliciousMessage *)message;
1316 malicious_action = msg->action;
1317
1318 if(GNUNET_OK == GDS_NEIGHBOURS_act_malicious (malicious_action))
1319 {
1320 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
1321 sizeof (struct GNUNET_DHT_ClientActMaliciousConfirmationMessage));
1322 conf = (struct GNUNET_DHT_ClientActMaliciousConfirmationMessage *) &pm[1];
1323 conf->header.size = htons (sizeof (struct GNUNET_DHT_ClientActMaliciousConfirmationMessage));
1324 conf->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_ACT_MALICIOUS_OK);
1325 pm->msg = &conf->header;
1326 add_pending_message (find_active_client (client), pm);
1327 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1328 }
1329}
1330#endif
1331
1332
1333/**
1334 * Functions with this signature are called whenever a client
1335 * is disconnected on the network level.
1336 *
1337 * @param cls closure (NULL for dht)
1338 * @param client identification of the client; NULL
1339 * for the last call when the server is destroyed
1340 */
1341static void
1342handle_client_disconnect (void *cls,
1343 struct GNUNET_SERVER_Client *client)
1344{
1345 struct ClientList *pos;
1346 struct PendingMessage *reply;
1347 struct ClientMonitorRecord *monitor;
1348
1349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1350 "Local client %p disconnects\n",
1351 client);
1352 pos = find_active_client (client);
1353 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, pos);
1354 if (pos->transmit_handle != NULL)
1355 GNUNET_SERVER_notify_transmit_ready_cancel (pos->transmit_handle);
1356 while (NULL != (reply = pos->pending_head))
1357 {
1358 GNUNET_CONTAINER_DLL_remove (pos->pending_head, pos->pending_tail, reply);
1359 GNUNET_free (reply);
1360 }
1361 monitor = monitor_head;
1362 while (NULL != monitor)
1363 {
1364 if (monitor->client == pos)
1365 {
1366 struct ClientMonitorRecord *next;
1367
1368 GNUNET_free_non_null (monitor->key);
1369 next = monitor->next;
1370 GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, monitor);
1371 GNUNET_free (monitor);
1372 monitor = next;
1373 }
1374 else
1375 monitor = monitor->next;
1376 }
1377 GNUNET_CONTAINER_multihashmap_iterate (forward_map, &remove_client_records,
1378 pos);
1379 GNUNET_free (pos);
1380}
1381
1382
1383
1384/**
1385 * Initialize client subsystem.
1386 *
1387 * @param server the initialized server
1388 */
1389void
1390GDS_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
1391{
1392 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1393 {&handle_dht_local_put, NULL,
1394 GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, 0},
1395 {&handle_dht_local_get, NULL,
1396 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, 0},
1397 {&handle_dht_local_get_stop, NULL,
1398 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP,
1399 sizeof (struct GNUNET_DHT_ClientGetStopMessage)},
1400 {&handle_dht_local_monitor, NULL,
1401 GNUNET_MESSAGE_TYPE_DHT_MONITOR_START,
1402 sizeof (struct GNUNET_DHT_MonitorStartStopMessage)},
1403 {&handle_dht_local_monitor_stop, NULL,
1404 GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP,
1405 sizeof (struct GNUNET_DHT_MonitorStartStopMessage)},
1406 {&handle_dht_local_get_result_seen, NULL,
1407 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN, 0},
1408 #if ENABLE_MALICIOUS
1409 {&handle_dht_act_malicious, NULL,
1410 GNUNET_MESSAGE_TYPE_DHT_ACT_MALICIOUS,
1411 sizeof (struct GNUNET_DHT_ActMaliciousMessage)},
1412 #endif
1413 {NULL, NULL, 0, 0}
1414 };
1415 forward_map = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_NO);
1416 retry_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1417 GNUNET_SERVER_add_handlers (server, plugin_handlers);
1418 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1419}
1420
1421
1422/**
1423 * Shutdown client subsystem.
1424 */
1425void
1426GDS_CLIENTS_done ()
1427{
1428 GNUNET_assert (client_head == NULL);
1429 GNUNET_assert (client_tail == NULL);
1430 if (NULL != retry_task)
1431 {
1432 GNUNET_SCHEDULER_cancel (retry_task);
1433 retry_task = NULL;
1434 }
1435 if (NULL != retry_heap)
1436 {
1437 GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (retry_heap));
1438 GNUNET_CONTAINER_heap_destroy (retry_heap);
1439 retry_heap = NULL;
1440 }
1441 if (NULL != forward_map)
1442 {
1443 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (forward_map));
1444 GNUNET_CONTAINER_multihashmap_destroy (forward_map);
1445 forward_map = NULL;
1446 }
1447}
1448
1449/* end of gnunet-service-dht_clients.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-19 13:50:42 +0000