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 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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;
57 * Global handle of the configuration
59 static const struct GNUNET_CONFIGURATION_Handle *cfg;
62 * Handle for the request
64 static struct GNUNET_DHT_FindPeerHandle *find_peer_handle;
67 * Count of results found
69 static unsigned int result_count;
77 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
79 if (dht_handle != NULL)
81 GNUNET_DHT_disconnect (dht_handle);
84 fprintf (stderr, _("Found %u peers\n"), result_count);
89 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
91 if (find_peer_handle != NULL)
93 GNUNET_DHT_find_peer_stop (find_peer_handle);
94 find_peer_handle = NULL;
96 GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
100 * Iterator called on each result obtained from a find peer
103 * @param cls closure (NULL)
104 * @param hello the response message, a HELLO
107 find_peer_processor (void *cls, const struct GNUNET_HELLO_Message *hello)
109 struct GNUNET_PeerIdentity peer;
111 if (GNUNET_OK == GNUNET_HELLO_get_id (hello, &peer))
115 fprintf (stderr, _("Found peer `%s'\n"), GNUNET_i2s (&peer));
121 * Main function that will be run by the scheduler.
124 * @param args remaining command-line arguments
125 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
126 * @param c configuration
131 const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
133 struct GNUNET_TIME_Relative timeout;
138 if (query_key == NULL)
141 fprintf (stderr, "Must provide key for DHT GET!\n");
146 dht_handle = GNUNET_DHT_connect (cfg, 1);
148 if (dht_handle == NULL)
151 fprintf (stderr, "Couldn't connect to DHT service!\n");
156 fprintf (stderr, "Connected to DHT service!\n");
158 GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
161 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, timeout_request);
162 absolute_timeout = GNUNET_TIME_relative_to_absolute (timeout);
165 fprintf (stderr, "Issuing FIND PEER request for %s!\n", query_key);
167 find_peer_handle = GNUNET_DHT_find_peer_start (dht_handle,
171 &find_peer_processor, NULL);
172 if (NULL == find_peer_handle)
174 GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
177 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
178 (absolute_timeout), &cleanup_task, NULL);
183 * gnunet-dht-get command line options
185 static struct GNUNET_GETOPT_CommandLineOption options[] = {
187 gettext_noop ("the query key"),
188 1, &GNUNET_GETOPT_set_string, &query_key},
189 {'T', "timeout", "TIMEOUT",
190 gettext_noop ("how long to execute this query before giving up?"),
191 1, &GNUNET_GETOPT_set_ulong, &timeout_request},
192 {'V', "verbose", NULL,
193 gettext_noop ("be verbose (print progress information)"),
194 0, &GNUNET_GETOPT_set_one, &verbose},
195 GNUNET_GETOPT_OPTION_END
200 * Entry point for gnunet-dht-get-peer
202 * @param argc number of arguments from the command line
203 * @param argv command line arguments
204 * @return 0 ok, 1 on error
207 main (int argc, char *const *argv)
210 GNUNET_PROGRAM_run (argc,
212 "gnunet-dht-get-peer",
214 ("Issue a GET PEER request to the GNUnet DHT, print results."),
215 options, &run, NULL)) ? ret : 1;
218 /* end of gnunet-dht-get-peer */