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;
128 static struct GNUNET_PeerIdentity me;
131 core_init (void *cls, struct GNUNET_CORE_Handle *server,
132 const struct GNUNET_PeerIdentity *my_identity)
138 * Core handler for p2p hostlist advertisements
141 advertisement_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
142 const struct GNUNET_MessageHeader *message,
143 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
145 GNUNET_assert (NULL != client_adv_handler);
146 return (*client_adv_handler) (cls, peer, message, atsi);
151 * Method called whenever a given peer connects. Wrapper to call both client's and server's functions
154 * @param peer peer identity this notification is about
155 * @param atsi performance data
158 connect_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
159 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
161 if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
164 "A new peer connected, notifying client and server\n");
165 if (NULL != client_ch)
166 (*client_ch) (cls, peer, atsi);
168 if (NULL != server_ch)
169 (*server_ch) (cls, peer, atsi);
174 * Method called whenever a given peer disconnects. Wrapper to call both client's and server's functions
177 * @param peer peer identity this notification is about
180 disconnect_handler (void *cls, const struct GNUNET_PeerIdentity *peer)
182 if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
184 /* call hostlist client disconnect handler */
185 if (NULL != client_dh)
186 (*client_dh) (cls, peer);
188 /* call hostlist server disconnect handler */
189 if (NULL != server_dh)
190 (*server_dh) (cls, peer);
195 * Last task run during shutdown. Disconnects us from
196 * the other services.
199 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hostlist daemon is shutting down\n");
204 GNUNET_CORE_disconnect (core);
209 GNUNET_HOSTLIST_client_stop ();
212 if (provide_hostlist)
214 GNUNET_HOSTLIST_server_stop ();
219 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
226 * Main function that will be run.
229 * @param args remaining command-line arguments
230 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
231 * @param cfg configuration
234 run (void *cls, char *const *args, const char *cfgfile,
235 const struct GNUNET_CONFIGURATION_Handle *cfg)
237 static const struct GNUNET_CORE_MessageHandler learn_handlers[] = {
238 {&advertisement_handler, GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT, 0},
241 static const struct GNUNET_CORE_MessageHandler no_learn_handlers[] = {
244 if ((!bootstrapping) && (!learning)
246 && (!provide_hostlist)
250 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
252 ("None of the functions for the hostlist daemon were enabled. I have no reason to run!\n"));
258 stats = GNUNET_STATISTICS_create ("hostlist", cfg);
261 GNUNET_CORE_connect (cfg, 1, NULL, &core_init, &connect_handler,
262 &disconnect_handler, NULL, GNUNET_NO, NULL,
264 learning ? learn_handlers : no_learn_handlers);
268 GNUNET_HOSTLIST_client_start (cfg, stats, &client_ch, &client_dh,
269 &client_adv_handler, learning);
273 if (provide_hostlist)
275 GNUNET_HOSTLIST_server_start (cfg, stats, core, &server_ch, &server_dh,
279 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleaning_task,
284 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
285 _("Failed to connect to `%s' service.\n"), "core");
286 GNUNET_SCHEDULER_shutdown ();
293 * The main function for the hostlist daemon.
295 * @param argc number of arguments from the command line
296 * @param argv command line arguments
297 * @return 0 ok, 1 on error
300 main (int argc, char *const *argv)
302 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
304 {'a', "advertise", NULL,
305 gettext_noop ("advertise our hostlist to other peers"),
306 GNUNET_NO, &GNUNET_GETOPT_set_one, &advertising},
308 {'b', "bootstrap", NULL,
310 ("bootstrap using hostlists (it is highly recommended that you always use this option)"),
311 GNUNET_NO, &GNUNET_GETOPT_set_one, &bootstrapping},
312 {'e', "enable-learning", NULL,
313 gettext_noop ("enable learning about hostlist servers from other peers"),
314 GNUNET_NO, &GNUNET_GETOPT_set_one, &learning},
316 {'p', "provide-hostlist", NULL,
317 gettext_noop ("provide a hostlist server"),
318 GNUNET_NO, &GNUNET_GETOPT_set_one, &provide_hostlist},
320 GNUNET_GETOPT_OPTION_END
325 GNUNET_log_setup ("hostlist", "WARNING", NULL);
328 GNUNET_PROGRAM_run (argc, argv, "hostlist",
329 _("GNUnet hostlist server and client"), options,
330 &run, NULL)) ? 0 : 1;
335 /* end of gnunet-daemon-hostlist.c */