summaryrefslogtreecommitdiff
path: root/src/transport/plugin_transport_http_client.c
blob: 79f70bb6c61d63396d9f2186ce250fe0a420416d (plain)
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
/*
     This file is part of GNUnet
     (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 transport/plugin_transport_http_client.c
 * @brief http transport service plugin
 * @author Matthias Wachs
 */

#include "plugin_transport_http.h"

static struct Plugin * p;

#if VERBOSE_CURL
/**
 * Function to log curl debug messages with GNUNET_log
 * @param curl handle
 * @param type curl_infotype
 * @param data data
 * @param size size
 * @param cls  closure
 * @return 0
 */
static int
client_log (CURL * curl, curl_infotype type, char *data, size_t size, void *cls)
{
  if (type == CURLINFO_TEXT)
  {
    char text[size + 2];

    memcpy (text, data, size);
    if (text[size - 1] == '\n')
      text[size] = '\0';
    else
    {
      text[size] = '\n';
      text[size + 1] = '\0';
    }
#if BUILD_HTTPS
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "transport-https",
                     "Client: %X - %s", cls, text);
#else
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "transport-http",
                     "Client: %X - %s", cls, text);
#endif
  }
  return 0;
}
#endif

/**
 * Task performing curl operations
 * @param cls plugin as closure
 * @param tc gnunet scheduler task context
 */
static void
client_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);

/**
 * Function setting up file descriptors and scheduling task to run
 *
 * @param  plugin plugin as closure
 * @param now schedule task in 1ms, regardless of what curl may say
 * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok
 */
static int
client_schedule (struct Plugin *plugin, int now)
{
  fd_set rs;
  fd_set ws;
  fd_set es;
  int max;
  struct GNUNET_NETWORK_FDSet *grs;
  struct GNUNET_NETWORK_FDSet *gws;
  long to;
  CURLMcode mret;
  struct GNUNET_TIME_Relative timeout;

  /* Cancel previous scheduled task */
  if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }

  max = -1;
  FD_ZERO (&rs);
  FD_ZERO (&ws);
  FD_ZERO (&es);
  mret = curl_multi_fdset (plugin->client_mh, &rs, &ws, &es, &max);
  if (mret != CURLM_OK)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("%s failed at %s:%d: `%s'\n"),
                "curl_multi_fdset", __FILE__, __LINE__,
                curl_multi_strerror (mret));
    return GNUNET_SYSERR;
  }
  mret = curl_multi_timeout (plugin->client_mh, &to);
  if (to == -1)
    timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1);
  else
    timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
  if (now == GNUNET_YES)
    timeout = GNUNET_TIME_UNIT_MILLISECONDS;

  if (mret != CURLM_OK)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("%s failed at %s:%d: `%s'\n"),
                "curl_multi_timeout", __FILE__, __LINE__,
                curl_multi_strerror (mret));
    return GNUNET_SYSERR;
  }

  grs = GNUNET_NETWORK_fdset_create ();
  gws = GNUNET_NETWORK_fdset_create ();
  GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
  GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);

  plugin->client_perform_task =
      GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
                                   timeout, grs, gws,
                                   &client_run, plugin);
  GNUNET_NETWORK_fdset_destroy (gws);
  GNUNET_NETWORK_fdset_destroy (grs);
  return GNUNET_OK;
}


int
client_send (struct Session *s, struct HTTP_Message *msg)
{
  GNUNET_assert (s != NULL);
  GNUNET_CONTAINER_DLL_insert (s->msg_head, s->msg_tail, msg);

  if (GNUNET_YES != exist_session(p, s))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }

  if (s->client_put_paused == GNUNET_YES)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name,
                     "Client: %X was suspended, unpausing\n", s->client_put);
    s->client_put_paused = GNUNET_NO;
    curl_easy_pause (s->client_put, CURLPAUSE_CONT);
  }

  client_schedule (s->plugin, GNUNET_YES);

  return GNUNET_OK;
}



/**
 * Task performing curl operations
 * @param cls plugin as closure
 * @param tc gnunet scheduler task context
 */
static void
client_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct Plugin *plugin = cls;
  int running;
  CURLMcode mret;

  GNUNET_assert (cls != NULL);

  plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;

  do
  {
    running = 0;
    mret = curl_multi_perform (plugin->client_mh, &running);

    CURLMsg *msg;
    int msgs_left;

    while ((msg = curl_multi_info_read (plugin->client_mh, &msgs_left)))
    {
      CURL *easy_h = msg->easy_handle;
      struct Session *s = NULL;
      char *d = (char *) s;


      //GNUNET_assert (easy_h != NULL);
      if (easy_h == NULL)
      {
        GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                         "Client: connection to ended with reason %i: `%s', %i handles running\n",
                         msg->data.result,
                         curl_easy_strerror (msg->data.result), running);
        continue;
      }

      GNUNET_assert (CURLE_OK ==
                     curl_easy_getinfo (easy_h, CURLINFO_PRIVATE, &d));
      s = (struct Session *) d;

      if (GNUNET_YES != exist_session(plugin, s))
      {
        GNUNET_break (0);
        return;
      }

      GNUNET_assert (s != NULL);

      if (msg->msg == CURLMSG_DONE)
      {
        GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                         "Client: %X connection to '%s'  %s ended with reason %i: `%s'\n",
                         msg->easy_handle, GNUNET_i2s (&s->target),
                         http_plugin_address_to_string (NULL, s->addr,
                                                        s->addrlen),
                         msg->data.result,
                         curl_easy_strerror (msg->data.result));

        client_disconnect (s);
        //GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,"Notifying about ended session to peer `%s' `%s'\n", GNUNET_i2s (&s->target), http_plugin_address_to_string (plugin, s->addr, s->addrlen));
        notify_session_end (plugin, &s->target, s);
      }
    }
  }
  while (mret == CURLM_CALL_MULTI_PERFORM);
  client_schedule (plugin, GNUNET_NO);
}

int
client_disconnect (struct Session *s)
{
  int res = GNUNET_OK;
  CURLMcode mret;
  struct Plugin *plugin = s->plugin;
  struct HTTP_Message *msg;
  struct HTTP_Message *t;

  if (GNUNET_YES != exist_session(plugin, s))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }

  if (s->client_put != NULL)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                     "Client: %X Deleting outbound PUT session to peer `%s'\n",
                     s->client_put, GNUNET_i2s (&s->target));

    mret = curl_multi_remove_handle (plugin->client_mh, s->client_put);
    if (mret != CURLM_OK)
    {
      curl_easy_cleanup (s->client_put);
      res = GNUNET_SYSERR;
      GNUNET_break (0);
    }
    curl_easy_cleanup (s->client_put);
    s->client_put = NULL;
  }


  if (s->recv_wakeup_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (s->recv_wakeup_task);
    s->recv_wakeup_task = GNUNET_SCHEDULER_NO_TASK;
  }

  if (s->client_get != NULL)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                     "Client: %X Deleting outbound GET session to peer `%s'\n",
                     s->client_get, GNUNET_i2s (&s->target));

    mret = curl_multi_remove_handle (plugin->client_mh, s->client_get);
    if (mret != CURLM_OK)
    {
      curl_easy_cleanup (s->client_get);
      res = GNUNET_SYSERR;
      GNUNET_break (0);
    }
    curl_easy_cleanup (s->client_get);
    s->client_get = NULL;
  }

  msg = s->msg_head;
  while (msg != NULL)
  {
    t = msg->next;
    if (NULL != msg->transmit_cont)
      msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_SYSERR);
    GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg);
    GNUNET_free (msg);
    msg = t;
  }

  plugin->cur_connections -= 2;

  GNUNET_assert (plugin->outbound_sessions > 0);
  plugin->outbound_sessions --;
  GNUNET_STATISTICS_set (plugin->env->stats,
      "# HTTP outbound sessions",
      plugin->outbound_sessions,
      GNUNET_NO);

  /* Re-schedule since handles have changed */
  if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }

  client_schedule (plugin, GNUNET_YES);

  return res;
}

static int
client_receive_mst_cb (void *cls, void *client,
                       const struct GNUNET_MessageHeader *message)
{
  struct Session *s = cls;
  struct GNUNET_TIME_Relative delay;

  if (GNUNET_YES != exist_session(p, s))
  {
    GNUNET_break (0);
    return GNUNET_OK;
  }

  delay = http_plugin_receive (s, &s->target, message, s, s->addr, s->addrlen);
  s->next_receive =
      GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), delay);

  if (GNUNET_TIME_absolute_get ().abs_value < s->next_receive.abs_value)
  {
    struct Plugin *plugin = s->plugin;

    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                     "Client: peer `%s' address `%s' next read delayed for %llu ms\n",
                     GNUNET_i2s (&s->target), GNUNET_a2s (s->addr, s->addrlen),
                     delay);
  }
  return GNUNET_OK;
}

static void
client_wake_up (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct Session *s = cls;

  if (GNUNET_YES != exist_session(p, s))
  {
    GNUNET_break (0);
    return;
  }

  s->recv_wakeup_task = GNUNET_SCHEDULER_NO_TASK;

  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;

  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name,
                   "Client: %X Waking up receive handle\n", s->client_get);

  if (s->client_get != NULL)
    curl_easy_pause (s->client_get, CURLPAUSE_CONT);

}

/**
* Callback method used with libcurl
* Method is called when libcurl needs to write data during sending
* @param stream pointer where to write data
* @param size size of an individual element
* @param nmemb count of elements that can be written to the buffer
* @param cls destination pointer, passed to the libcurl handle
* @return bytes read from stream
*/
static size_t
client_receive (void *stream, size_t size, size_t nmemb, void *cls)
{
  struct Session *s = cls;
  struct GNUNET_TIME_Absolute now;
  size_t len = size * nmemb;
  struct Plugin *plugin = s->plugin;

  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Client: Received %Zu bytes from peer `%s'\n", len,
                   GNUNET_i2s (&s->target));
  now = GNUNET_TIME_absolute_get ();
  if (now.abs_value < s->next_receive.abs_value)
  {
    struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
    struct GNUNET_TIME_Relative delta =
        GNUNET_TIME_absolute_get_difference (now, s->next_receive);
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                     "Client: %X No inbound bandwidth available! Next read was delayed for %llu ms\n",
                     s->client_get, delta.rel_value);
    if (s->recv_wakeup_task != GNUNET_SCHEDULER_NO_TASK)
    {
      GNUNET_SCHEDULER_cancel (s->recv_wakeup_task);
      s->recv_wakeup_task = GNUNET_SCHEDULER_NO_TASK;
    }
    s->recv_wakeup_task =
        GNUNET_SCHEDULER_add_delayed (delta, &client_wake_up, s);
    return CURLPAUSE_ALL;
  }


  if (s->msg_tk == NULL)
    s->msg_tk = GNUNET_SERVER_mst_create (&client_receive_mst_cb, s);

  GNUNET_SERVER_mst_receive (s->msg_tk, s, stream, len, GNUNET_NO, GNUNET_NO);

  return len;
}

/**
 * Callback method used with libcurl
 * Method is called when libcurl needs to read data during sending
 * @param stream pointer where to write data
 * @param size size of an individual element
 * @param nmemb count of elements that can be written to the buffer
 * @param cls source pointer, passed to the libcurl handle
 * @return bytes written to stream, returning 0 will terminate connection!
 */
static size_t
client_send_cb (void *stream, size_t size, size_t nmemb, void *cls)
{
  struct Session *s = cls;
  struct Plugin *plugin = s->plugin;
  size_t bytes_sent = 0;
  size_t len;

  if (GNUNET_YES != exist_session(plugin, s))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }

  struct HTTP_Message *msg = s->msg_head;

  if (msg == NULL)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                     "Client: %X Nothing to send! Suspending PUT handle!\n",
                     s->client_put);
    s->client_put_paused = GNUNET_YES;
    return CURL_READFUNC_PAUSE;
  }

  GNUNET_assert (msg != NULL);
  /* data to send */
  if (msg->pos < msg->size)
  {
    /* data fit in buffer */
    if ((msg->size - msg->pos) <= (size * nmemb))
    {
      len = (msg->size - msg->pos);
      memcpy (stream, &msg->buf[msg->pos], len);
      msg->pos += len;
      bytes_sent = len;
    }
    else
    {
      len = size * nmemb;
      memcpy (stream, &msg->buf[msg->pos], len);
      msg->pos += len;
      bytes_sent = len;
    }
  }
  /* no data to send */
  else
  {
    GNUNET_assert (0);
    bytes_sent = 0;
  }

  if (msg->pos == msg->size)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                     "Client: %X Message with %u bytes sent, removing message from queue\n",
                     s->client_put, msg->size, msg->pos);
    /* Calling transmit continuation  */
    if (NULL != msg->transmit_cont)
      msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_OK);
    GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg);
    GNUNET_free (msg);
  }
  return bytes_sent;
}

int
client_connect (struct Session *s)
{
  struct Plugin *plugin = s->plugin;
  int res = GNUNET_OK;
  char *url;
  CURLMcode mret;

  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Initiating outbound session peer `%s'\n",
                   GNUNET_i2s (&s->target));
  s->inbound = GNUNET_NO;
  plugin->last_tag++;
  /* create url */
  GNUNET_asprintf (&url, "%s%s;%u",
                   http_plugin_address_to_string (plugin, s->addr, s->addrlen),
                   GNUNET_h2s_full (&plugin->env->my_identity->hashPubKey),
                   plugin->last_tag);
#if 0
  GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name, "URL `%s'\n", url);
#endif
  /* create get connection */
  s->client_get = curl_easy_init ();
#if VERBOSE_CURL
  curl_easy_setopt (s->client_get, CURLOPT_VERBOSE, 1L);
  curl_easy_setopt (s->client_get, CURLOPT_DEBUGFUNCTION, &client_log);
  curl_easy_setopt (s->client_get, CURLOPT_DEBUGDATA, s->client_get);
#endif
#if BUILD_HTTPS
  curl_easy_setopt (s->client_get, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
  curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYPEER, 0);
  curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYHOST, 0);
#endif
  curl_easy_setopt (s->client_get, CURLOPT_URL, url);
  //curl_easy_setopt (s->client_get, CURLOPT_HEADERFUNCTION, &curl_get_header_cb);
  //curl_easy_setopt (s->client_get, CURLOPT_WRITEHEADER, ps);
  curl_easy_setopt (s->client_get, CURLOPT_READFUNCTION, client_send_cb);
  curl_easy_setopt (s->client_get, CURLOPT_READDATA, s);
  curl_easy_setopt (s->client_get, CURLOPT_WRITEFUNCTION, client_receive);
  curl_easy_setopt (s->client_get, CURLOPT_WRITEDATA, s);
  curl_easy_setopt (s->client_get, CURLOPT_TIMEOUT_MS,
                    (long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_get, CURLOPT_PRIVATE, s);
  curl_easy_setopt (s->client_get, CURLOPT_CONNECTTIMEOUT_MS,
                    (long) HTTP_NOT_VALIDATED_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_get, CURLOPT_BUFFERSIZE,
                    2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
#if CURL_TCP_NODELAY
  curl_easy_setopt (ps->recv_endpoint, CURLOPT_TCP_NODELAY, 1);
#endif

  /* create put connection */
  s->client_put = curl_easy_init ();
#if VERBOSE_CURL
  curl_easy_setopt (s->client_put, CURLOPT_VERBOSE, 1L);
  curl_easy_setopt (s->client_put, CURLOPT_DEBUGFUNCTION, &client_log);
  curl_easy_setopt (s->client_put, CURLOPT_DEBUGDATA, s->client_put);
#endif
#if BUILD_HTTPS
  curl_easy_setopt (s->client_put, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
  curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYPEER, 0);
  curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYHOST, 0);
#endif
  curl_easy_setopt (s->client_put, CURLOPT_URL, url);
  curl_easy_setopt (s->client_put, CURLOPT_PUT, 1L);
  //curl_easy_setopt (s->client_put, CURLOPT_HEADERFUNCTION, &curl_put_header_cb);
  //curl_easy_setopt (s->client_put, CURLOPT_WRITEHEADER, ps);
  curl_easy_setopt (s->client_put, CURLOPT_READFUNCTION, client_send_cb);
  curl_easy_setopt (s->client_put, CURLOPT_READDATA, s);
  curl_easy_setopt (s->client_put, CURLOPT_WRITEFUNCTION, client_receive);
  curl_easy_setopt (s->client_put, CURLOPT_WRITEDATA, s);
  curl_easy_setopt (s->client_put, CURLOPT_TIMEOUT_MS,
                    (long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_put, CURLOPT_PRIVATE, s);
  curl_easy_setopt (s->client_put, CURLOPT_CONNECTTIMEOUT_MS,
                    (long) HTTP_NOT_VALIDATED_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_put, CURLOPT_BUFFERSIZE,
                    2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
#if CURL_TCP_NODELAY
  curl_easy_setopt (s->client_put, CURLOPT_TCP_NODELAY, 1);
#endif

  GNUNET_free (url);

  mret = curl_multi_add_handle (plugin->client_mh, s->client_get);
  if (mret != CURLM_OK)
  {
    curl_easy_cleanup (s->client_get);
    res = GNUNET_SYSERR;
    GNUNET_break (0);
  }

  mret = curl_multi_add_handle (plugin->client_mh, s->client_put);
  if (mret != CURLM_OK)
  {
    curl_multi_remove_handle (plugin->client_mh, s->client_get);
    curl_easy_cleanup (s->client_get);
    curl_easy_cleanup (s->client_put);
    res = GNUNET_SYSERR;
    GNUNET_break (0);
  }

  /* Perform connect */
  plugin->cur_connections += 2;

  plugin->outbound_sessions ++;
  GNUNET_STATISTICS_set (plugin->env->stats,
      "# HTTP outbound sessions",
      plugin->outbound_sessions,
      GNUNET_NO);

  /* Re-schedule since handles have changed */
  if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }
  plugin->client_perform_task = GNUNET_SCHEDULER_add_now (client_run, plugin);

  return res;
}

int
client_start (struct Plugin *plugin)
{
  int res = GNUNET_OK;
  p = plugin;

  curl_global_init (CURL_GLOBAL_ALL);
  plugin->client_mh = curl_multi_init ();

  if (NULL == plugin->client_mh)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
                     _
                     ("Could not initialize curl multi handle, failed to start %s plugin!\n"),
                         plugin->name);
    res = GNUNET_SYSERR;
  }
  return res;
}

void
client_stop (struct Plugin *plugin)
{
  p = NULL;
  if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }

  curl_multi_cleanup (plugin->client_mh);
  curl_global_cleanup ();
}



/* end of plugin_transport_http_client.c */