2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 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 dht/gnunet-service-xdht.c
23 * @brief GNUnet DHT service
24 * @author Christian Grothoff
25 * @author Nathan Evans
29 #include "gnunet_block_lib.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_transport_service.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_dht_service.h"
34 #include "gnunet_statistics_service.h"
35 #include "gnunet-service-xdht.h"
36 #include "gnunet-service-xdht_clients.h"
37 #include "gnunet-service-xdht_datacache.h"
38 #include "gnunet-service-xdht_hello.h"
39 #include "gnunet-service-xdht_neighbours.h"
40 #include "gnunet-service-xdht_nse.h"
41 #include "gnunet-service-xdht_routing.h"
46 * Handle for the statistics service.
48 struct GNUNET_STATISTICS_Handle *GDS_stats;
51 * Our handle to the BLOCK library.
53 struct GNUNET_BLOCK_Context *GDS_block_context;
56 * The configuration the DHT service is running with
58 const struct GNUNET_CONFIGURATION_Handle *GDS_cfg;
63 struct GNUNET_MessageHeader *GDS_my_hello;
66 * Handle to the transport service, for getting our hello
68 struct GNUNET_TRANSPORT_Handle *GDS_transport_handle;
71 * Handle to get our current HELLO.
73 static struct GNUNET_TRANSPORT_GetHelloHandle *ghh;
76 * Hello address expiration
78 struct GNUNET_TIME_Relative hello_expiration;
82 * Receive the HELLO from transport service, free current and replace
86 * @param message HELLO message of peer
89 process_hello (void *cls, const struct GNUNET_MessageHeader *message)
91 GNUNET_assert (message != NULL);
92 GNUNET_free_non_null (GDS_my_hello);
93 GDS_my_hello = GNUNET_malloc (ntohs (message->size));
94 memcpy (GDS_my_hello, message, ntohs (message->size));
99 * Task run during shutdown.
105 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
109 GNUNET_TRANSPORT_get_hello_cancel (ghh);
112 if (GDS_transport_handle != NULL)
114 GNUNET_TRANSPORT_disconnect (GDS_transport_handle);
115 GDS_transport_handle = NULL;
118 GDS_NEIGHBOURS_done ();
119 GDS_DATACACHE_done ();
123 if (GDS_block_context != NULL)
125 GNUNET_BLOCK_context_destroy (GDS_block_context);
126 GDS_block_context = NULL;
128 if (GDS_stats != NULL)
130 GNUNET_STATISTICS_destroy (GDS_stats, GNUNET_YES);
133 GNUNET_free_non_null (GDS_my_hello);
139 * Process dht requests.
142 * @param server the initialized server
143 * @param c configuration to use
146 run (void *cls, struct GNUNET_SERVER_Handle *server,
147 const struct GNUNET_CONFIGURATION_Handle *c)
151 GNUNET_CONFIGURATION_get_value_time (c, "transport", "HELLO_EXPIRATION", &hello_expiration))
153 hello_expiration = GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION;
155 GDS_block_context = GNUNET_BLOCK_context_create (GDS_cfg);
156 GDS_stats = GNUNET_STATISTICS_create ("dht", GDS_cfg);
160 GDS_DATACACHE_init ();
162 GDS_CLIENTS_init (server);
164 if (GNUNET_OK != GDS_NEIGHBOURS_init ())
166 shutdown_task (NULL, NULL);
169 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
171 GDS_transport_handle =
172 GNUNET_TRANSPORT_connect (GDS_cfg, NULL, NULL, NULL, NULL, NULL);
173 if (GDS_transport_handle == NULL)
175 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
176 _("Failed to connect to transport service!\n"));
179 ghh = GNUNET_TRANSPORT_get_hello (GDS_transport_handle, &process_hello, NULL);
184 * The main function for the dht service.
186 * @param argc number of arguments from the command line
187 * @param argv command line arguments
188 * @return 0 ok, 1 on error
191 main (int argc, char *const *argv)
196 Here add a new field threshold to set user defined threshold
197 on routing table size and trail length. Pass the thr1 and thr2
198 to neighbours_init and in neighbours file, in function where we
199 are adding a new entry into our routing table and trail length,
200 check the threshold values. After conducting experiments, try to
201 find the correct threshold to have a balance between attack tolerance
205 GNUNET_SERVICE_run (argc, argv, "dht", GNUNET_SERVICE_OPTION_NONE, &run,
211 /* end of gnunet-service-dht.c */