2 This file is part of GNUnet.
3 (C) 2001, 2002, 2004, 2005, 2006, 2007, 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 2, 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.
21 * @file dht/gnunet-dht-get-peer.c
22 * @brief search for peers close to key using the DHT
23 * @author Christian Grothoff
24 * @author Nathan Evans
27 #include "gnunet_dht_service.h"
28 #include "gnunet_hello_lib.h"
31 * The key for the query
33 static char *query_key;
36 * User supplied timeout value (in seconds)
38 static unsigned long long timeout_request = 5;
41 * When this request should really die
43 struct GNUNET_TIME_Absolute absolute_timeout;
53 static struct GNUNET_DHT_Handle *dht_handle;
56 * Global handle of the scheduler
58 static struct GNUNET_SCHEDULER_Handle *sched;
61 * Global handle of the configuration
63 static const struct GNUNET_CONFIGURATION_Handle *cfg;
66 * Handle for the request
68 static struct GNUNET_DHT_FindPeerHandle *find_peer_handle;
71 * Count of results found
73 // static unsigned int result_count;
81 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
84 if (dht_handle != NULL)
85 GNUNET_DHT_disconnect (dht_handle);
91 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
93 if (find_peer_handle != NULL)
94 GNUNET_DHT_find_peer_stop (find_peer_handle, &shutdown_task, NULL);
96 GNUNET_SCHEDULER_add_now (sched, &shutdown_task, NULL);
100 * Iterator called on each result obtained from a find peer
103 * @param cls closure (NULL)
104 * @param peer the peer we learned about
105 * @param reply the response message, should be a HELLO
107 void find_peer_processor (void *cls,
108 const struct GNUNET_PeerIdentity *peer,
109 const struct GNUNET_MessageHeader *reply)
112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
113 "test_find_peer_processor called (peer `%s'), stopping find peer request!\n", GNUNET_i2s(peer));
119 * Signature of the main function of a task.
122 * @param tc context information (why was this task triggered now)
125 message_sent_cont (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
127 if (tc->reason == GNUNET_SCHEDULER_REASON_TIMEOUT)
131 "Failed to send FIND PEER request to service, quitting.\n");
133 GNUNET_SCHEDULER_add_now (sched, &shutdown_task, NULL);
138 fprintf (stderr, "FIND PEER request sent, awaiting results!\n");
139 GNUNET_SCHEDULER_add_delayed (sched,
140 GNUNET_TIME_absolute_get_remaining
141 (absolute_timeout), &cleanup_task, NULL);
146 * Main function that will be run by the scheduler.
149 * @param s the scheduler to use
150 * @param args remaining command-line arguments
151 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
152 * @param c configuration
156 struct GNUNET_SCHEDULER_Handle *s,
158 const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
160 struct GNUNET_TIME_Relative timeout;
165 if (query_key == NULL)
168 fprintf (stderr, "Must provide key for DHT GET!\n");
173 dht_handle = GNUNET_DHT_connect (sched, cfg, 1);
175 if (dht_handle == NULL)
178 fprintf (stderr, "Couldn't connect to DHT service!\n");
183 fprintf (stderr, "Connected to DHT service!\n");
185 GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
188 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, timeout_request);
189 absolute_timeout = GNUNET_TIME_relative_to_absolute (timeout);
192 fprintf (stderr, "Issuing FIND PEER request for %s!\n", query_key);
194 find_peer_handle = GNUNET_DHT_find_peer_start (dht_handle, timeout, 0, NULL, &key,
195 &find_peer_processor, NULL, &message_sent_cont, NULL);
201 * gnunet-dht-get command line options
203 static struct GNUNET_GETOPT_CommandLineOption options[] = {
205 gettext_noop ("the query key"),
206 1, &GNUNET_GETOPT_set_string, &query_key},
207 {'T', "timeout", "TIMEOUT",
208 gettext_noop ("how long to execute this query before giving up?"),
209 1, &GNUNET_GETOPT_set_ulong, &timeout_request},
210 {'V', "verbose", NULL,
211 gettext_noop ("be verbose (print progress information)"),
212 0, &GNUNET_GETOPT_set_one, &verbose},
213 GNUNET_GETOPT_OPTION_END
218 * Entry point for gnunet-dht-get-peer
220 * @param argc number of arguments from the command line
221 * @param argv command line arguments
222 * @return 0 ok, 1 on error
225 main (int argc, char *const *argv)
228 GNUNET_PROGRAM_run (argc,
232 ("Issue a GET request to the GNUnet DHT, prints results."),
233 options, &run, NULL)) ? ret : 1;