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_util_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_statistics_service.h"
37 #include "hostlist-server.h"
40 * Set if we are allowed to advertise our hostlist to others.
42 static int advertising;
45 * Set if the user wants us to run a hostlist server.
47 static int provide_hostlist;
50 * Handle to hostlist server's connect handler
52 static GNUNET_CORE_ConnectEventHandler server_ch;
55 * Handle to hostlist server's disconnect handler
57 static GNUNET_CORE_DisconnectEventHandler server_dh;
62 * Set if we are allowed to learn about peers by accessing
65 static int bootstrapping;
68 * Set if the user allows us to learn about new hostlists
76 static struct GNUNET_STATISTICS_Handle *stats;
79 * Handle to the core service (NULL until we've connected to it).
81 static struct GNUNET_CORE_Handle *core;
84 * Handle to the hostlist client's advertisement handler
86 static GNUNET_CORE_MessageCallback client_adv_handler;
89 * Handle to hostlist client's connect handler
91 static GNUNET_CORE_ConnectEventHandler client_ch;
94 * Handle to hostlist client's disconnect handler
96 static GNUNET_CORE_DisconnectEventHandler client_dh;
98 GNUNET_NETWORK_STRUCT_BEGIN
101 * A HOSTLIST_ADV message is used to exchange information about
102 * hostlist advertisements. This struct is always
103 * followed by the actual url under which the hostlist can be obtained:
105 * 1) transport-name (0-terminated)
106 * 2) address-length (uint32_t, network byte order; possibly
108 * 3) address expiration (GNUNET_TIME_AbsoluteNBO); possibly
110 * 4) address (address-length bytes; possibly unaligned!)
112 struct GNUNET_HOSTLIST_ADV_Message
115 * Type will be GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT.
117 struct GNUNET_MessageHeader header;
120 * Always zero (for alignment).
122 uint32_t reserved GNUNET_PACKED;
124 GNUNET_NETWORK_STRUCT_END
126 static struct GNUNET_PeerIdentity me;
130 core_init (void *cls,
131 const struct GNUNET_PeerIdentity *my_identity)
138 * Core handler for p2p hostlist advertisements
141 * @param peer identity of the sender
142 * @param message advertisement message we got
143 * @return #GNUNET_OK on success
146 advertisement_handler (void *cls, const struct GNUNET_PeerIdentity *peer,
147 const struct GNUNET_MessageHeader *message)
149 GNUNET_assert (NULL != client_adv_handler);
150 return (*client_adv_handler) (cls, peer, message);
155 * Method called whenever a given peer connects. Wrapper to call both
156 * client's and server's functions
159 * @param peer peer identity this notification is about
162 connect_handler (void *cls, const struct GNUNET_PeerIdentity *peer)
164 if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
166 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
167 "A new peer connected, notifying client and server\n");
168 if (NULL != client_ch)
169 (*client_ch) (cls, peer);
171 if (NULL != server_ch)
172 (*server_ch) (cls, peer);
178 * Method called whenever a given peer disconnects. Wrapper to call
179 * both client's and server's functions
182 * @param peer peer identity this notification is about
185 disconnect_handler (void *cls, const struct GNUNET_PeerIdentity *peer)
187 if (0 == memcmp (&me, peer, sizeof (struct GNUNET_PeerIdentity)))
189 /* call hostlist client disconnect handler */
190 if (NULL != client_dh)
191 (*client_dh) (cls, peer);
193 /* call hostlist server disconnect handler */
194 if (NULL != server_dh)
195 (*server_dh) (cls, peer);
201 * Last task run during shutdown. Disconnects us from
202 * the other services.
205 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
208 "Hostlist daemon is shutting down\n");
211 GNUNET_CORE_disconnect (core);
216 GNUNET_HOSTLIST_client_stop ();
219 if (provide_hostlist)
221 GNUNET_HOSTLIST_server_stop ();
226 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
233 * Main function that will be run.
236 * @param args remaining command-line arguments
237 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
238 * @param cfg configuration
241 run (void *cls, char *const *args, const char *cfgfile,
242 const struct GNUNET_CONFIGURATION_Handle *cfg)
244 static const struct GNUNET_CORE_MessageHandler learn_handlers[] = {
245 {&advertisement_handler, GNUNET_MESSAGE_TYPE_HOSTLIST_ADVERTISEMENT, 0},
248 static const struct GNUNET_CORE_MessageHandler no_learn_handlers[] = {
251 if ((!bootstrapping) && (!learning)
253 && (!provide_hostlist)
257 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
259 ("None of the functions for the hostlist daemon were enabled. I have no reason to run!\n"));
262 stats = GNUNET_STATISTICS_create ("hostlist", cfg);
264 GNUNET_HOSTLIST_client_start (cfg, stats, &client_ch, &client_dh,
265 &client_adv_handler, learning);
267 GNUNET_CORE_connect (cfg, NULL,
270 &disconnect_handler, NULL,
273 learning ? learn_handlers : no_learn_handlers);
277 if (provide_hostlist)
278 GNUNET_HOSTLIST_server_start (cfg, stats, core, &server_ch, &server_dh,
281 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
287 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
288 _("Failed to connect to `%s' service.\n"), "core");
289 GNUNET_SCHEDULER_shutdown ();
296 * The main function for the hostlist daemon.
298 * @param argc number of arguments from the command line
299 * @param argv command line arguments
300 * @return 0 ok, 1 on error
303 main (int argc, char *const *argv)
305 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
307 {'a', "advertise", NULL,
308 gettext_noop ("advertise our hostlist to other peers"),
309 GNUNET_NO, &GNUNET_GETOPT_set_one, &advertising},
311 {'b', "bootstrap", NULL,
313 ("bootstrap using hostlists (it is highly recommended that you always use this option)"),
314 GNUNET_NO, &GNUNET_GETOPT_set_one, &bootstrapping},
315 {'e', "enable-learning", NULL,
316 gettext_noop ("enable learning about hostlist servers from other peers"),
317 GNUNET_NO, &GNUNET_GETOPT_set_one, &learning},
319 {'p', "provide-hostlist", NULL,
320 gettext_noop ("provide a hostlist server"),
321 GNUNET_NO, &GNUNET_GETOPT_set_one, &provide_hostlist},
323 GNUNET_GETOPT_OPTION_END
328 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
331 GNUNET_log_setup ("hostlist", "WARNING", NULL);
334 GNUNET_PROGRAM_run (argc, argv, "hostlist",
335 _("GNUnet hostlist server and client"), options,
336 &run, NULL)) ? 0 : 1;
337 GNUNET_free ((void*) argv);
341 /* end of gnunet-daemon-hostlist.c */