aboutsummaryrefslogtreecommitdiff
path: root/src/hostlist/gnunet-daemon-hostlist.c
blob: 2ef80744407181a71c0ed1b293131700caf5ff3a (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
/*
     This file is part of GNUnet.
     (C) 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 hostlist/gnunet-daemon-hostlist.c
 * @brief code for bootstrapping via hostlist servers
 * @author Christian Grothoff
 */

#include <stdlib.h>
#include "platform.h"
#include "hostlist-client.h"
#include "gnunet_core_service.h"
#include "gnunet_getopt_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_program_lib.h"
#include "gnunet_statistics_service.h"
#include "gnunet_strings_lib.h"
#include "gnunet_time_lib.h"
#include "gnunet_util_lib.h"

#if HAVE_MHD

#include "hostlist-server.h"

/**
 * Set if we are allowed to advertise our hostlist to others.
 */
static int advertising;

/**
 * Set if the user wants us to run a hostlist server.
 */
static int provide_hostlist;

/**
 * Handle to hostlist server's connect handler
 */
static GNUNET_CORE_ConnectEventHandler server_ch;

/**
 * Handle to hostlist server's disconnect handler
 */
static GNUNET_CORE_DisconnectEventHandler server_dh;

#endif

/**
 * Set if we are allowed to learn about peers by accessing
 * hostlist servers.
 */
static int bootstrapping;

/**
 * Set if the user allows us to learn about new hostlists
 * from the network.
 */
static int learning;

/**
 * Statistics handle.
 */
static struct GNUNET_STATISTICS_Handle *stats;

/**
 * Handle to the core service (NULL until we've connected to it).
 */
static struct GNUNET_CORE_Handle *core;

/**
 * Handle to the hostlist client's advertisement handler
 */
static GNUNET_CORE_MessageCallback client_adv_handler;

/**
 * Handle to hostlist client's connect handler
 */
static GNUNET_CORE_ConnectEventHandler client_ch;

/**
 * Handle to hostlist client's disconnect handler
 */
static GNUNET_CORE_DisconnectEventHandler client_dh;

/**
 * A HOSTLIST_ADV message is used to exchange information about
 * hostlist advertisements.  This struct is always
 * followed by the actual url under which the hostlist can be obtained:
 *
 * 1) transport-name (0-terminated)
 * 2) address-length (uint32_t, network byte order; possibly
 *    unaligned!)
 * 3) address expiration (GNUNET_TIME_AbsoluteNBO); possibly
 *    unaligned!)
 * 4) address (address-length bytes; possibly unaligned!)
 */
struct GNUNET_HOSTLIST_ADV_Message
{
  /**
   * Type will be GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT.
   */
  struct GNUNET_MessageHeader header;

  /**
   * Always zero (for alignment).
   */
  uint32_t reserved GNUNET_PACKED;
};


static struct GNUNET_PeerIdentity me;

static void
core_init (void *cls, struct GNUNET_CORE_Handle *server,
           const struct GNUNET_PeerIdentity *my_identity)
{
  me = *my_identity;
}

/**
 * Core handler for p2p hostlist advertisements
 *
 * @param atsi_count number of records in 'atsi'
 */
static int
advertisement_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
                       const struct GNUNET_MessageHeader *message,
                       const struct GNUNET_ATS_Information *atsi,
		       unsigned int atsi_count)
{
  GNUNET_assert (NULL != client_adv_handler);
  return (*client_adv_handler) (cls, peer, message, atsi, atsi_count);
}


/**
 * Method called whenever a given peer connects.  Wrapper to call both client's and server's functions
 *
 * @param cls closure
 * @param peer peer identity this notification is about
 * @param atsi performance data
 * @param atsi_count number of records in 'atsi'
 */
static void
connect_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
                 const struct GNUNET_ATS_Information *atsi,
		 unsigned int atsi_count)
{
  if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
    return;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "A new peer connected, notifying client and server\n");
  if (NULL != client_ch)
    (*client_ch) (cls, peer, atsi, atsi_count);
#if HAVE_MHD
  if (NULL != server_ch)
    (*server_ch) (cls, peer, atsi, atsi_count);
#endif
}

/**
 * Method called whenever a given peer disconnects. Wrapper to call both client's and server's functions
 *
 * @param cls closure
 * @param peer peer identity this notification is about
 */
static void
disconnect_handler (void *cls, const struct GNUNET_PeerIdentity *peer)
{
  if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
    return;
  /* call hostlist client disconnect handler */
  if (NULL != client_dh)
    (*client_dh) (cls, peer);
#if HAVE_MHD
  /* call hostlist server disconnect handler */
  if (NULL != server_dh)
    (*server_dh) (cls, peer);
#endif
}

/**
 * Last task run during shutdown.  Disconnects us from
 * the other services.
 */
static void
cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hostlist daemon is shutting down\n");
  if (core != NULL)
  {
    GNUNET_CORE_disconnect (core);
    core = NULL;
  }
  if (bootstrapping)
  {
    GNUNET_HOSTLIST_client_stop ();
  }
#if HAVE_MHD
  if (provide_hostlist)
  {
    GNUNET_HOSTLIST_server_stop ();
  }
#endif
  if (stats != NULL)
  {
    GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
    stats = NULL;
  }
}


/**
 * Main function that will be run.
 *
 * @param cls closure
 * @param args remaining command-line arguments
 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 * @param cfg configuration
 */
static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  static const struct GNUNET_CORE_MessageHandler learn_handlers[] = {
    {&advertisement_handler, GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT, 0},
    {NULL, 0, 0}
  };
  static const struct GNUNET_CORE_MessageHandler no_learn_handlers[] = {
    {NULL, 0, 0}
  };
  if ((!bootstrapping) && (!learning)
#if HAVE_MHD
      && (!provide_hostlist)
#endif
      )
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _
                ("None of the functions for the hostlist daemon were enabled.  I have no reason to run!\n"));
    return;
  }



  stats = GNUNET_STATISTICS_create ("hostlist", cfg);

  core =
      GNUNET_CORE_connect (cfg, 1, NULL, &core_init, &connect_handler,
                           &disconnect_handler, NULL, GNUNET_NO, NULL,
                           GNUNET_NO,
                           learning ? learn_handlers : no_learn_handlers);

  if (bootstrapping)
  {
    GNUNET_HOSTLIST_client_start (cfg, stats, &client_ch, &client_dh,
                                  &client_adv_handler, learning);
  }

#if HAVE_MHD
  if (provide_hostlist)
  {
    GNUNET_HOSTLIST_server_start (cfg, stats, core, &server_ch, &server_dh,
                                  advertising);
  }
#endif
  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleaning_task,
                                NULL);

  if (NULL == core)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _("Failed to connect to `%s' service.\n"), "core");
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
}


/**
 * The main function for the hostlist daemon.
 *
 * @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)
{
  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
#if HAVE_MHD
    {'a', "advertise", NULL,
     gettext_noop ("advertise our hostlist to other peers"),
     GNUNET_NO, &GNUNET_GETOPT_set_one, &advertising},
#endif
    {'b', "bootstrap", NULL,
     gettext_noop
     ("bootstrap using hostlists (it is highly recommended that you always use this option)"),
     GNUNET_NO, &GNUNET_GETOPT_set_one, &bootstrapping},
    {'e', "enable-learning", NULL,
     gettext_noop ("enable learning about hostlist servers from other peers"),
     GNUNET_NO, &GNUNET_GETOPT_set_one, &learning},
#if HAVE_MHD
    {'p', "provide-hostlist", NULL,
     gettext_noop ("provide a hostlist server"),
     GNUNET_NO, &GNUNET_GETOPT_set_one, &provide_hostlist},
#endif
    GNUNET_GETOPT_OPTION_END
  };

  int ret;

  GNUNET_log_setup ("hostlist", "WARNING", NULL);
  ret =
      (GNUNET_OK ==
       GNUNET_PROGRAM_run (argc, argv, "hostlist",
                           _("GNUnet hostlist server and client"), options,
                           &run, NULL)) ? 0 : 1;

  return ret;
}

/* end of gnunet-daemon-hostlist.c */