2 This file is part of GNUnet.
3 (C) 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
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.
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.
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.
22 * @file hostlist/gnunet-daemon-hostlist.c
23 * @brief code for bootstrapping via hostlist servers
24 * @author Christian Grothoff
29 #include "hostlist-client.h"
30 #include "gnunet_core_service.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_program_lib.h"
34 #include "gnunet_statistics_service.h"
35 #include "gnunet_strings_lib.h"
36 #include "gnunet_time_lib.h"
37 #include "gnunet_util_lib.h"
41 #include "hostlist-server.h"
44 * Set if we are allowed to advertise our hostlist to others.
46 static int advertising;
49 * Set if the user wants us to run a hostlist server.
51 static int provide_hostlist;
54 * Handle to hostlist server's connect handler
56 static GNUNET_CORE_ConnectEventHandler server_ch;
59 * Handle to hostlist server's disconnect handler
61 static GNUNET_CORE_DisconnectEventHandler server_dh;
66 * Set if we are allowed to learn about peers by accessing
69 static int bootstrapping;
72 * Set if the user allows us to learn about new hostlists
80 static struct GNUNET_STATISTICS_Handle *stats;
83 * Handle to the core service (NULL until we've connected to it).
85 static struct GNUNET_CORE_Handle *core;
88 * Handle to the hostlist client's advertisement handler
90 static GNUNET_CORE_MessageCallback client_adv_handler;
93 * Handle to hostlist client's connect handler
95 static GNUNET_CORE_ConnectEventHandler client_ch;
98 * Handle to hostlist client's disconnect handler
100 static GNUNET_CORE_DisconnectEventHandler client_dh;
103 * A HOSTLIST_ADV message is used to exchange information about
104 * hostlist advertisements. This struct is always
105 * followed by the actual url under which the hostlist can be obtained:
107 * 1) transport-name (0-terminated)
108 * 2) address-length (uint32_t, network byte order; possibly
110 * 3) address expiration (GNUNET_TIME_AbsoluteNBO); possibly
112 * 4) address (address-length bytes; possibly unaligned!)
114 struct GNUNET_HOSTLIST_ADV_Message
117 * Type will be GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT.
119 struct GNUNET_MessageHeader header;
122 * Always zero (for alignment).
124 uint32_t reserved GNUNET_PACKED;
129 core_init (void *cls,
130 struct GNUNET_CORE_Handle * server,
131 const struct GNUNET_PeerIdentity *
134 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
137 /* Nothing to do here */
141 * Core handler for p2p hostlist advertisements
143 static int advertisement_handler (void *cls,
144 const struct GNUNET_PeerIdentity * peer,
145 const struct GNUNET_MessageHeader * message,
146 struct GNUNET_TIME_Relative latency,
149 GNUNET_assert (NULL != client_adv_handler);
150 return (*client_adv_handler) (cls, peer, message, latency, distance);
155 * Method called whenever a given peer connects. Wrapper to call both client's and server's functions
158 * @param peer peer identity this notification is about
159 * @param latency reported latency of the connection with 'other'
160 * @param distance reported distance (DV) to 'other'
163 connect_handler (void *cls,
165 GNUNET_PeerIdentity * peer,
166 struct GNUNET_TIME_Relative latency,
169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
170 "A new peer connected, notifying client and server\n");
171 if ( NULL != client_ch)
172 (*client_ch) (cls, peer, latency, distance);
174 if ( NULL != server_ch)
175 (*server_ch) (cls, peer, latency, distance);
180 * Method called whenever a given peer disconnects. Wrapper to call both client's and server's functions
183 * @param peer peer identity this notification is about
186 disconnect_handler (void *cls,
188 GNUNET_PeerIdentity * peer)
191 /* call hostlist client disconnect handler*/
192 if ( NULL != client_dh)
193 (*client_dh) (cls, peer);
195 /* call hostlist server disconnect handler*/
196 if ( NULL != server_dh)
197 (*server_dh) (cls, peer);
202 * Last task run during shutdown. Disconnects us from
203 * the other services.
206 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
209 "Hostlist daemon is shutting down\n");
212 GNUNET_CORE_disconnect (core);
217 GNUNET_HOSTLIST_client_stop ();
220 if (provide_hostlist)
222 GNUNET_HOSTLIST_server_stop ();
227 GNUNET_STATISTICS_destroy (stats,
235 * Main function that will be run.
238 * @param sched the scheduler to use
239 * @param args remaining command-line arguments
240 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
241 * @param cfg configuration
245 struct GNUNET_SCHEDULER_Handle * sched,
248 const struct GNUNET_CONFIGURATION_Handle * cfg)
250 static const struct GNUNET_CORE_MessageHandler learn_handlers[] = {
251 { &advertisement_handler, GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT, 0},
254 static const struct GNUNET_CORE_MessageHandler no_learn_handlers[] = {
257 if ( (! bootstrapping) &&
260 && (! provide_hostlist)
264 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
265 _("None of the functions for the hostlist daemon were enabled. I have no reason to run!\n"));
271 stats = GNUNET_STATISTICS_create (sched, "hostlist", cfg);
273 core = GNUNET_CORE_connect (sched, cfg,
274 GNUNET_TIME_UNIT_FOREVER_REL,
277 &connect_handler, &disconnect_handler, NULL,
280 learning? learn_handlers : no_learn_handlers);
284 GNUNET_HOSTLIST_client_start (cfg, sched, stats,
285 &client_ch, &client_dh, &client_adv_handler, learning);
289 if (provide_hostlist)
291 GNUNET_HOSTLIST_server_start (cfg, sched, stats, core, &server_ch, &server_dh, advertising );
294 GNUNET_SCHEDULER_add_delayed (sched,
295 GNUNET_TIME_UNIT_FOREVER_REL,
296 &cleaning_task, NULL);
300 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
301 _("Failed to connect to `%s' service.\n"),
303 GNUNET_SCHEDULER_shutdown (sched);
310 * The main function for the hostlist daemon.
312 * @param argc number of arguments from the command line
313 * @param argv command line arguments
314 * @return 0 ok, 1 on error
317 main (int argc, char *const *argv)
319 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
321 { 'a', "advertise", NULL,
322 gettext_noop ("advertise our hostlist to other peers"),
323 GNUNET_NO, &GNUNET_GETOPT_set_one, &advertising },
325 { 'b', "bootstrap", NULL,
326 gettext_noop ("bootstrap using hostlists (it is highly recommended that you always use this option)"),
327 GNUNET_NO, &GNUNET_GETOPT_set_one, &bootstrapping },
328 { 'e', "enable-learning", NULL,
329 gettext_noop ("enable learning about hostlist servers from other peers"),
330 GNUNET_NO, &GNUNET_GETOPT_set_one, &learning},
332 { 'p', "provide-hostlist", NULL,
333 gettext_noop ("provide a hostlist server"),
334 GNUNET_NO, &GNUNET_GETOPT_set_one, &provide_hostlist},
336 GNUNET_GETOPT_OPTION_END
340 GNUNET_log_setup ("hostlist", "WARNING", NULL);
342 GNUNET_PROGRAM_run (argc,
345 _("GNUnet hostlist server and client"),
347 &run, NULL)) ? 0 : 1;
352 /* end of gnunet-daemon-hostlist.c */