summaryrefslogtreecommitdiff
path: root/src/ats/gnunet-service-ats_scheduling.c
blob: f5e286a643e96c62797c7dcb65170966553a4dcf (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
/*
     This file is part of GNUnet.
     (C) 2011 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 ats/gnunet-service-ats_scheduling.c
 * @brief ats service, interaction with 'scheduling' API
 * @author Matthias Wachs
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet-service-ats.h"
#include "gnunet-service-ats_addresses.h"
#include "gnunet-service-ats_scheduling.h"
#include "ats.h"


/**
 * Context for sending messages to clients.
 */
static struct GNUNET_SERVER_NotificationContext *nc;

/**
 * Actual handle to the client.
 */
static struct GNUNET_SERVER_Client *my_client;


/**
 * Register a new scheduling client.
 *
 * @param client handle of the new client
 * @return GNUNET_OK on success, GNUNET_SYSERR on error
 */
int
GAS_scheduling_add_client (struct GNUNET_SERVER_Client *client)
{
  if (my_client != NULL)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "This ATS already has a scheduling client, refusing new scheduling client for now.\n");
    return GNUNET_SYSERR;
  }
  my_client = client;
  GNUNET_SERVER_notification_context_add (nc, client);
  GNUNET_SERVER_client_keep (client);
  return GNUNET_OK;
}


/**
 * Unregister a client (which may have been a scheduling client,
 * but this is not assured).
 *
 * @param client handle of the (now dead) client
 */
void
GAS_scheduling_remove_client (struct GNUNET_SERVER_Client *client)
{
  if (my_client != client)
    return;
  GAS_addresses_destroy_all ();
  GNUNET_SERVER_client_drop (client);
  my_client = NULL;
}


/**
 * Transmit the given address suggestion and bandwidth update to all scheduling
 * clients.
 *
 * @param peer peer for which this is an address suggestion
 * @param plugin_name 0-termintated string specifying the transport plugin
 * @param plugin_addr binary address for the plugin to use
 * @param plugin_addr_len number of bytes in plugin_addr
 * @param session_id session ID to use for the given client (other clients will see 0)
 * @param atsi performance data for the address
 * @param atsi_count number of performance records in 'ats'
 * @param bandwidth_out assigned outbound bandwidth
 * @param bandwidth_in assigned inbound bandwidth
 */
void
GAS_scheduling_transmit_address_suggestion (const struct GNUNET_PeerIdentity
                                            *peer, const char *plugin_name,
                                            const void *plugin_addr,
                                            size_t plugin_addr_len,
                                            uint32_t session_id,
                                            const struct GNUNET_ATS_Information
                                            *atsi, uint32_t atsi_count,
                                            struct GNUNET_BANDWIDTH_Value32NBO
                                            bandwidth_out,
                                            struct GNUNET_BANDWIDTH_Value32NBO
                                            bandwidth_in)
{
  struct AddressSuggestionMessage *msg;
  size_t plugin_name_length = strlen (plugin_name) + 1;
  size_t msize =
      sizeof (struct AddressSuggestionMessage) +
      atsi_count * sizeof (struct GNUNET_ATS_Information) + plugin_addr_len +
      plugin_name_length;
  char buf[msize];
  struct GNUNET_ATS_Information *atsp;
  char *addrp;

  if (my_client == NULL)
    return;
  GNUNET_STATISTICS_update (GSA_stats, "# address suggestions made", 1,
                            GNUNET_NO);
  GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
  GNUNET_assert (atsi_count <
                 GNUNET_SERVER_MAX_MESSAGE_SIZE /
                 sizeof (struct GNUNET_ATS_Information));
  msg = (struct AddressSuggestionMessage *) buf;
  msg->header.size = htons (msize);
  msg->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_ADDRESS_SUGGESTION);
  msg->ats_count = htonl (atsi_count);
  msg->peer = *peer;
  msg->address_length = htons (plugin_addr_len);
  msg->plugin_name_length = htons (plugin_name_length);
  msg->session_id = htonl (session_id);
  msg->bandwidth_out = bandwidth_out;
  msg->bandwidth_in = bandwidth_in;
  atsp = (struct GNUNET_ATS_Information *) &msg[1];
  memcpy (atsp, atsi, sizeof (struct GNUNET_ATS_Information) * atsi_count);
  addrp = (char *) &atsp[atsi_count];
  memcpy (addrp, plugin_addr, plugin_addr_len);
  strcpy (&addrp[plugin_addr_len], plugin_name);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "ATS sends quota for peer `%s': (in/out) %u/%u\n",
              GNUNET_i2s (peer), ntohl (bandwidth_in.value__),
              ntohl (bandwidth_out.value__));

  GNUNET_SERVER_notification_context_unicast (nc, my_client, &msg->header,
                                              GNUNET_YES);
}


/**
 * Handle 'request address' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_request_address (void *cls, struct GNUNET_SERVER_Client *client,
                            const struct GNUNET_MessageHeader *message)
{
  const struct RequestAddressMessage *msg =
      (const struct RequestAddressMessage *) message;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
              "REQUEST_ADDRESS");
  GNUNET_STATISTICS_update (GSA_stats, "# address requests received", 1,
                            GNUNET_NO);
  GNUNET_break (0 == ntohl (msg->reserved));
  GAS_addresses_request_address (&msg->peer);
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


/**
 * Handle 'request address' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_request_address_cancel (void *cls,
                                   struct GNUNET_SERVER_Client *client,
                                   const struct GNUNET_MessageHeader *message)
{
  const struct RequestAddressMessage *msg =
      (const struct RequestAddressMessage *) message;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
              "REQUEST_ADDRESS_CANCEL");
  GNUNET_break (0 == ntohl (msg->reserved));

  /* TODO */

  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


/**
 * Handle 'address update' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_address_update (void *cls, struct GNUNET_SERVER_Client *client,
                           const struct GNUNET_MessageHeader *message)
{
  const struct AddressUpdateMessage *m;
  const struct GNUNET_ATS_Information *atsi;
  const char *address;
  const char *plugin_name;
  uint16_t address_length;
  uint16_t plugin_name_length;
  uint32_t ats_count;
  uint16_t size;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
              "ADDRESS_UPDATE");
  size = ntohs (message->size);
  if (size < sizeof (struct AddressUpdateMessage))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  m = (const struct AddressUpdateMessage *) message;
  ats_count = ntohl (m->ats_count);
  address_length = ntohs (m->address_length);
  plugin_name_length = ntohs (m->plugin_name_length);
  atsi = (const struct GNUNET_ATS_Information *) &m[1];
  address = (const char *) &atsi[ats_count];
  if (plugin_name_length != 0)
    plugin_name = &address[address_length];
  else
    plugin_name = "";
  if ((address_length + plugin_name_length +
       ats_count * sizeof (struct GNUNET_ATS_Information) +
       sizeof (struct AddressUpdateMessage) != ntohs (message->size)) ||
      (ats_count >
       GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_ATS_Information))
      || (plugin_name[plugin_name_length - 1] != '\0'))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  GNUNET_STATISTICS_update (GSA_stats, "# address updates received", 1,
                            GNUNET_NO);
  GAS_addresses_update (&m->peer, plugin_name, address, address_length,
                        ntohl (m->session_id), atsi, ats_count);
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


/**
 * Handle 'address in use' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_address_in_use (void *cls, struct GNUNET_SERVER_Client *client,
                           const struct GNUNET_MessageHeader *message)
{
  const struct AddressUseMessage *m;
  const char *address;
  const char *plugin_name;
  uint16_t address_length;
  uint16_t plugin_name_length;

  uint16_t size;
  uint16_t in_use;

  size = ntohs (message->size);
  if (size < sizeof (struct AddressUseMessage))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  m = (const struct AddressUseMessage *) message;

  address_length = ntohs (m->address_length);
  plugin_name_length = ntohs (m->plugin_name_length);

  address = (const char *) &m[1];
  if (plugin_name_length != 0)
    plugin_name = &address[address_length];
  else
    plugin_name = "";

  if ((address_length + plugin_name_length +
       sizeof (struct AddressUseMessage) != ntohs (message->size)) ||
      (plugin_name[plugin_name_length - 1] != '\0'))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }

  in_use = ntohs (m->in_use);
  GAS_addresses_in_use (&m->peer, plugin_name, address, address_length,
                        ntohl (m->session_id), in_use);

  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}

/**
 * Handle 'address destroyed' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_address_destroyed (void *cls, struct GNUNET_SERVER_Client *client,
                              const struct GNUNET_MessageHeader *message)
{
  const struct AddressDestroyedMessage *m;
  struct SessionReleaseMessage srm;
  const char *address;
  const char *plugin_name;
  uint16_t address_length;
  uint16_t plugin_name_length;
  uint16_t size;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message of size %u %u\n",
              "ADDRESS_DESTROYED", ntohs (message->size),
              sizeof (struct AddressDestroyedMessage));
  size = ntohs (message->size);
  if ((size < sizeof (struct AddressDestroyedMessage)) || (client != my_client))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  m = (const struct AddressDestroyedMessage *) message;
  GNUNET_break (0 == ntohl (m->reserved));
  address_length = ntohs (m->address_length);
  plugin_name_length = ntohs (m->plugin_name_length);
  address = (const char *) &m[1];
  if (plugin_name_length != 0)
    plugin_name = &address[address_length];
  else
    plugin_name = "";
  if ((address_length + plugin_name_length +
       sizeof (struct AddressDestroyedMessage) != ntohs (message->size)))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  if ((plugin_name_length == 0) ||
      (plugin_name[plugin_name_length - 1] != '\0'))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  GNUNET_STATISTICS_update (GSA_stats, "# addresses destroyed", 1, GNUNET_NO);
  GAS_addresses_destroy (&m->peer, plugin_name, address, address_length,
                         ntohl (m->session_id));
  if (0 != ntohl (m->session_id))
  {
    srm.header.type = ntohs (GNUNET_MESSAGE_TYPE_ATS_SESSION_RELEASE);
    srm.header.size = ntohs (sizeof (struct SessionReleaseMessage));
    srm.session_id = m->session_id;
    srm.peer = m->peer;
    GNUNET_SERVER_notification_context_unicast (nc, client, &srm.header,
                                                GNUNET_NO);
  }
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


/**
 * Initialize scheduling subsystem.
 *
 * @param server handle to our server
 */
void
GAS_scheduling_init (struct GNUNET_SERVER_Handle *server)
{
  nc = GNUNET_SERVER_notification_context_create (server, 128);
}


/**
 * Shutdown scheduling subsystem.
 */
void
GAS_scheduling_done ()
{
  GNUNET_SERVER_notification_context_destroy (nc);
  nc = NULL;
}


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