aboutsummaryrefslogtreecommitdiff
path: root/src/peerinfo/gnunet-service-peerinfo.c
blob: 4dd33dd5a2e213f1c600592bf19ab506d6f9fbb5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
/*
     This file is part of GNUnet.
     (C) 2001, 2002, 2004, 2005, 2007, 2009, 2010 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file peerinfo/gnunet-service-peerinfo.c
 * @brief maintains list of known peers
 *
 * Code to maintain the list of currently known hosts (in memory
 * structure of data/hosts/).
 *
 * @author Christian Grothoff
 *
 * TODO:
 * - HostEntries are never 'free'd (add expiration, upper bound?)
 */

#include "platform.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_container_lib.h"
#include "gnunet_disk_lib.h"
#include "gnunet_hello_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_service_lib.h"
#include "gnunet_statistics_service.h"
#include "peerinfo.h"

/**
 * How often do we scan the HOST_DIR for new entries?
 */
#define DATA_HOST_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)

/**
 * How often do we discard old entries in data/hosts/?
 */
#define DATA_HOST_CLEAN_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 60)

/**
 * In-memory cache of known hosts.
 */
struct HostEntry
{

  /**
   * Identity of the peer.
   */
  struct GNUNET_PeerIdentity identity;

  /**
   * Hello for the peer (can be NULL)
   */
  struct GNUNET_HELLO_Message *hello;

};


/**
 * The in-memory list of known hosts, mapping of
 * host IDs to 'struct HostEntry*' values.
 */
static struct GNUNET_CONTAINER_MultiHashMap *hostmap;

/**
 * Clients to immediately notify about all changes.
 */
static struct GNUNET_SERVER_NotificationContext *notify_list;

/**
 * Directory where the hellos are stored in (data/hosts)
 */
static char *networkIdDirectory;

/**
 * Handle for reporting statistics.
 */
static struct GNUNET_STATISTICS_Handle *stats;


/**
 * Notify all clients in the notify list about the
 * given host entry changing.
 */
static struct InfoMessage *
make_info_message (const struct HostEntry *he)
{
  struct InfoMessage *im;
  size_t hs;

  hs = (he->hello == NULL) ? 0 : GNUNET_HELLO_size (he->hello);
  im = GNUNET_malloc (sizeof (struct InfoMessage) + hs);
  im->header.size = htons (hs + sizeof (struct InfoMessage));
  im->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_INFO);
  im->peer = he->identity;
  if (he->hello != NULL)
    memcpy (&im[1], he->hello, hs);
  return im;
}


/**
 * Address iterator that causes expired entries to be discarded.
 *
 * @param cls pointer to the current time
 * @param tname name of the transport
 * @param expiration expiration time for the address
 * @param addr the address
 * @param addrlen length of addr in bytes
 * @return GNUNET_NO if expiration smaller than the current time
 */
static int
discard_expired (void *cls,
                 const char *tname,
                 struct GNUNET_TIME_Absolute expiration,
                 const void *addr, uint16_t addrlen)
{
  const struct GNUNET_TIME_Absolute *now = cls;
  if (now->abs_value > expiration.abs_value)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
		  _("Removing expired address of transport `%s'\n"),
		  tname);
      return GNUNET_NO;
    }
  return GNUNET_OK;
}


/**
 * Get the filename under which we would store the GNUNET_HELLO_Message
 * for the given host and protocol.
 * @return filename of the form DIRECTORY/HOSTID
 */
static char *
get_host_filename (const struct GNUNET_PeerIdentity *id)
{
  struct GNUNET_CRYPTO_HashAsciiEncoded fil;
  char *fn;

  GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
  GNUNET_asprintf (&fn,
                   "%s%s%s", networkIdDirectory, DIR_SEPARATOR_STR, &fil);
  return fn;
}


/**
 * Broadcast information about the given entry to all 
 * clients that care.
 *
 * @param entry entry to broadcast about
 */
static void
notify_all (struct HostEntry *entry)
{
  struct InfoMessage *msg;

  msg = make_info_message (entry);
  GNUNET_SERVER_notification_context_broadcast (notify_list,
						&msg->header,
						GNUNET_NO);
  GNUNET_free (msg);
}


/**
 * Add a host to the list.
 *
 * @param identity the identity of the host
 */
static void
add_host_to_known_hosts (const struct GNUNET_PeerIdentity *identity)
{
  struct HostEntry *entry;
  char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
  const struct GNUNET_HELLO_Message *hello;
  struct GNUNET_HELLO_Message *hello_clean;
  int size;
  struct GNUNET_TIME_Absolute now;
  char *fn;

  entry = GNUNET_CONTAINER_multihashmap_get (hostmap,
					     &identity->hashPubKey);
  if (entry != NULL)
    return;
  GNUNET_STATISTICS_update (stats,
			    gettext_noop ("# peers known"),
			    1,
			    GNUNET_NO);
  entry = GNUNET_malloc (sizeof (struct HostEntry));
  entry->identity = *identity;

  fn = get_host_filename (identity);
  if (GNUNET_DISK_file_test (fn) == GNUNET_YES)
    {
      size = GNUNET_DISK_fn_read (fn, buffer, sizeof (buffer));
      hello = (const struct GNUNET_HELLO_Message *) buffer;
      if ( (size < sizeof (struct GNUNET_MessageHeader)) ||
	   (size != ntohs((((const struct GNUNET_MessageHeader*) hello)->size))) ||
	   (size != GNUNET_HELLO_size (hello)) )
	{
	  GNUNET_break (0);
	  if (0 != UNLINK (fn))
	    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
				      "unlink",
				      fn);
	}
      else
	{
	  now = GNUNET_TIME_absolute_get ();
	  hello_clean = GNUNET_HELLO_iterate_addresses (hello,
							GNUNET_YES,
							&discard_expired, &now);
	  entry->hello = hello_clean;
	}
    }
  GNUNET_free (fn);
  GNUNET_CONTAINER_multihashmap_put (hostmap,
				     &identity->hashPubKey,
				     entry,
				     GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
  notify_all (entry);
}


/**
 * Remove a file that should not be there.  LOG
 * success or failure.
 */
static void
remove_garbage (const char *fullname)
{
  if (0 == UNLINK (fullname))
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
                _
                ("File `%s' in directory `%s' does not match naming convention. "
                 "Removed.\n"), fullname, networkIdDirectory);
  else
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR |
                              GNUNET_ERROR_TYPE_BULK, "unlink", fullname);
}


static int
hosts_directory_scan_callback (void *cls,
			       const char *fullname)
{
  unsigned int *matched = cls;
  struct GNUNET_PeerIdentity identity;
  const char *filename;

  if (GNUNET_DISK_file_test (fullname) != GNUNET_YES)
    return GNUNET_OK;           /* ignore non-files */
  if (strlen (fullname) < sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded))
    {
      remove_garbage (fullname);
      return GNUNET_OK;
    }
  filename =
    &fullname[strlen (fullname) -
              sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1];
  if (filename[-1] != DIR_SEPARATOR)
    {
      remove_garbage (fullname);
      return GNUNET_OK;
    }
  if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (filename,
                                                   &identity.hashPubKey))
    {
      remove_garbage (fullname);
      return GNUNET_OK;
    }
  (*matched)++;
  add_host_to_known_hosts (&identity);
  return GNUNET_OK;
}


/**
 * Call this method periodically to scan data/hosts for new hosts.
 */
static void
cron_scan_directory_data_hosts (void *cls,
                                const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  static unsigned int retries;
  unsigned int count;

  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;
  count = 0;
  if (GNUNET_SYSERR == GNUNET_DISK_directory_create (networkIdDirectory))
    {
      GNUNET_SCHEDULER_add_delayed (DATA_HOST_FREQ,
				    &cron_scan_directory_data_hosts, NULL);
      return;
    }
  GNUNET_DISK_directory_scan (networkIdDirectory,
                              &hosts_directory_scan_callback, &count);
  if ((0 == count) && (0 == (++retries & 31)))
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
                GNUNET_ERROR_TYPE_BULK,
                _("Still no peers found in `%s'!\n"), networkIdDirectory);
  GNUNET_SCHEDULER_add_delayed (DATA_HOST_FREQ,
                                &cron_scan_directory_data_hosts, NULL);
}


/**
 * Bind a host address (hello) to a hostId.
 *
 * @param peer the peer for which this is a hello
 * @param hello the verified (!) hello message
 */
static void
bind_address (const struct GNUNET_PeerIdentity *peer,
              const struct GNUNET_HELLO_Message *hello)
{
  char *fn;
  struct HostEntry *host;
  struct GNUNET_HELLO_Message *mrg;
  struct GNUNET_TIME_Absolute delta;

  add_host_to_known_hosts (peer);
  host = GNUNET_CONTAINER_multihashmap_get (hostmap,
					    &peer->hashPubKey);
  GNUNET_assert (host != NULL);
  if (host->hello == NULL)
    {
      host->hello = GNUNET_malloc (GNUNET_HELLO_size (hello));
      memcpy (host->hello, hello, GNUNET_HELLO_size (hello));
    }
  else
    {
      mrg = GNUNET_HELLO_merge (host->hello, hello);
      delta = GNUNET_HELLO_equals (mrg,
				   host->hello,
				   GNUNET_TIME_absolute_get ());
      if (delta.abs_value == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
	{
	  GNUNET_free (mrg);
	  return;
	}
      GNUNET_free (host->hello);
      host->hello = mrg;
    }
  fn = get_host_filename (peer);
  if (GNUNET_OK == GNUNET_DISK_directory_create_for_file (fn))
    {
      if (GNUNET_SYSERR ==
	  GNUNET_DISK_fn_write (fn, 
				host->hello, 
				GNUNET_HELLO_size (host->hello),
				GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
				| GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ))
	GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
				  "write",
				  fn);
	
    }
  GNUNET_free (fn);
  notify_all (host);
}



/**
 * Do transmit info about peer to given host.
 *
 * @param cls NULL to hit all hosts, otherwise specifies a particular target
 * @param key hostID
 * @param value information to transmit
 * @return GNUNET_YES (continue to iterate)
 */
static int
add_to_tc (void *cls,
	   const GNUNET_HashCode *key,
	   void *value)
{
  struct GNUNET_SERVER_TransmitContext *tc = cls;
  struct HostEntry *pos = value;
  struct InfoMessage *im;
  uint16_t hs;
  char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];

  hs = 0;
  im = (struct InfoMessage *) buf;
  if (pos->hello != NULL)
    {
      hs = GNUNET_HELLO_size (pos->hello);
      GNUNET_assert (hs <
		     GNUNET_SERVER_MAX_MESSAGE_SIZE -
		     sizeof (struct InfoMessage));
      memcpy (&im[1], pos->hello, hs);
    }
  im->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_INFO);
  im->header.size = htons (sizeof (struct InfoMessage) + hs);
  im->reserved = htonl (0);
  im->peer = pos->identity;
  GNUNET_SERVER_transmit_context_append_message (tc,
						 &im->header);
  return GNUNET_YES;
}


/**
 * @brief delete expired HELLO entries in data/hosts/
 */
static int
discard_hosts_helper (void *cls, const char *fn)
{
  struct GNUNET_TIME_Absolute *now = cls;
  char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
  const struct GNUNET_HELLO_Message *hello;
  struct GNUNET_HELLO_Message *new_hello;
  int size;

  size = GNUNET_DISK_fn_read (fn, buffer, sizeof (buffer));
  if (size < sizeof (struct GNUNET_MessageHeader))
    {
      if (0 != UNLINK (fn))
	GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
				  GNUNET_ERROR_TYPE_BULK, "unlink", fn);
      return GNUNET_OK;
    }
  hello = (const struct GNUNET_HELLO_Message *) buffer;
  new_hello = GNUNET_HELLO_iterate_addresses (hello,
                                              GNUNET_YES,
                                              &discard_expired, now);
  if (new_hello != NULL)
    {
      GNUNET_DISK_fn_write (fn, 
			    new_hello,
			    GNUNET_HELLO_size (new_hello),
			    GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
			    | GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ);
      GNUNET_free (new_hello);
    }
  else
    {
      if (0 != UNLINK (fn))
	GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
				  GNUNET_ERROR_TYPE_BULK, "unlink", fn);      
    }
  return GNUNET_OK;
}


/**
 * Call this method periodically to scan data/hosts for new hosts.
 */
static void
cron_clean_data_hosts (void *cls,
                       const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_TIME_Absolute now;

  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;
  now = GNUNET_TIME_absolute_get ();
  GNUNET_DISK_directory_scan (networkIdDirectory,
                              &discard_hosts_helper, &now);
  GNUNET_SCHEDULER_add_delayed (DATA_HOST_CLEAN_FREQ,
                                &cron_clean_data_hosts, NULL);
}


/**
 * Handle HELLO-message.
 *
 * @param cls closure
 * @param client identification of the client
 * @param message the actual message
 */
static void
handle_hello (void *cls,
	      struct GNUNET_SERVER_Client *client,
	      const struct GNUNET_MessageHeader *message)
{
  const struct GNUNET_HELLO_Message *hello;
  struct GNUNET_PeerIdentity pid;

  hello = (const struct GNUNET_HELLO_Message *) message;
  if (GNUNET_OK !=  GNUNET_HELLO_get_id (hello, &pid))
    {
      GNUNET_break (0);
      GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
      return;
    }
#if DEBUG_PEERINFO
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "`%s' message received for peer `%4s'\n",
	      "HELLO",
	      GNUNET_i2s (&pid));
#endif
  bind_address (&pid, hello);
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


/**
 * Handle GET-message.
 *
 * @param cls closure
 * @param client identification of the client
 * @param message the actual message
 */
static void
handle_get (void *cls,
            struct GNUNET_SERVER_Client *client,
            const struct GNUNET_MessageHeader *message)
{
  const struct ListPeerMessage *lpm;
  struct GNUNET_SERVER_TransmitContext *tc;

  lpm = (const struct ListPeerMessage *) message;
  GNUNET_break (0 == ntohl (lpm->reserved));
#if DEBUG_PEERINFO
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "`%s' message received for peer `%4s'\n",
	      "GET",
	      GNUNET_i2s (&lpm->peer));
#endif
  tc = GNUNET_SERVER_transmit_context_create (client);
  GNUNET_CONTAINER_multihashmap_get_multiple (hostmap,
					      &lpm->peer.hashPubKey,
					      &add_to_tc,
					      tc);
  GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
					      GNUNET_MESSAGE_TYPE_PEERINFO_INFO_END);
  GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
}


/**
 * Handle GET-ALL-message.
 *
 * @param cls closure
 * @param client identification of the client
 * @param message the actual message
 */
static void
handle_get_all (void *cls,
                struct GNUNET_SERVER_Client *client,
                const struct GNUNET_MessageHeader *message)
{
  struct GNUNET_SERVER_TransmitContext *tc;

#if DEBUG_PEERINFO
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "`%s' message received\n",
	      "GET_ALL");
#endif
  tc = GNUNET_SERVER_transmit_context_create (client);
  GNUNET_CONTAINER_multihashmap_iterate (hostmap,
					 &add_to_tc,
					 tc);
  GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
					      GNUNET_MESSAGE_TYPE_PEERINFO_INFO_END);
  GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
}


static int
do_notify_entry (void *cls,
		 const GNUNET_HashCode *key,
		 void *value)
{
  struct GNUNET_SERVER_Client *client = cls;
  struct HostEntry *he = value;
  struct InfoMessage *msg;

  msg = make_info_message (he);
  GNUNET_SERVER_notification_context_unicast (notify_list,
					      client,
					      &msg->header,
					      GNUNET_NO);
  GNUNET_free (msg);
  return GNUNET_YES;
}


/**
 * Handle NOTIFY-message.
 *
 * @param cls closure
 * @param client identification of the client
 * @param message the actual message
 */
static void
handle_notify (void *cls,
	       struct GNUNET_SERVER_Client *client,
	       const struct GNUNET_MessageHeader *message)
{
#if DEBUG_PEERINFO
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "`%s' message received\n",
	      "NOTIFY");
#endif
  GNUNET_SERVER_notification_context_add (notify_list,
					  client);
  GNUNET_CONTAINER_multihashmap_iterate (hostmap,
					 &do_notify_entry,
					 client);
}


static int
free_host_entry (void *cls,
		 const GNUNET_HashCode *key,
		 void *value)
{
  struct HostEntry *he = value;

  GNUNET_free_non_null (he->hello);
  GNUNET_free (he);
  return GNUNET_YES;
}

/**
 * Clean up our state.  Called during shutdown.
 *
 * @param cls unused
 * @param tc scheduler task context, unused
 */
static void
shutdown_task (void *cls,
	       const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GNUNET_SERVER_notification_context_destroy (notify_list);
  notify_list = NULL;
  GNUNET_CONTAINER_multihashmap_iterate (hostmap,
					 &free_host_entry,
					 NULL);
  GNUNET_CONTAINER_multihashmap_destroy (hostmap);
  if (stats != NULL)
    {
      GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
      stats = NULL;
    }
}


/**
 * Process statistics requests.
 *
 * @param cls closure
 * @param server the initialized server
 * @param cfg configuration to use
 */
static void
run (void *cls,
     struct GNUNET_SERVER_Handle *server,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  static const struct GNUNET_SERVER_MessageHandler handlers[] = {
    {&handle_hello, NULL, GNUNET_MESSAGE_TYPE_HELLO, 0},
    {&handle_get, NULL, GNUNET_MESSAGE_TYPE_PEERINFO_GET,
     sizeof (struct ListPeerMessage)},
    {&handle_get_all, NULL, GNUNET_MESSAGE_TYPE_PEERINFO_GET_ALL,
     sizeof (struct GNUNET_MessageHeader)},
    {&handle_notify, NULL, GNUNET_MESSAGE_TYPE_PEERINFO_NOTIFY,
     sizeof (struct GNUNET_MessageHeader)},
    {NULL, NULL, 0, 0}
  };

  hostmap = GNUNET_CONTAINER_multihashmap_create (1024);
  stats = GNUNET_STATISTICS_create ("peerinfo", cfg);
  notify_list = GNUNET_SERVER_notification_context_create (server, 0);
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONFIGURATION_get_value_filename (cfg,
                                                          "peerinfo",
                                                          "HOSTS",
                                                          &networkIdDirectory));
  GNUNET_DISK_directory_create (networkIdDirectory);
  GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_IDLE,
				      &cron_scan_directory_data_hosts, NULL);
  GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_IDLE,
				      &cron_clean_data_hosts, NULL);
  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
				&shutdown_task, NULL);
  GNUNET_SERVER_add_handlers (server, handlers);
}


/**
 * The main function for the statistics service.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc, char *const *argv)
{
  int ret;

  ret = (GNUNET_OK ==
	 GNUNET_SERVICE_run (argc,
			     argv,
                              "peerinfo",
			     GNUNET_SERVICE_OPTION_NONE,
			     &run, NULL)) ? 0 : 1;
  GNUNET_free_non_null (networkIdDirectory);
  return ret;
}


/* end of gnunet-service-peerinfo.c */