2 This file is part of GNUnet.
3 (C) 2008 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.
22 * @file hostlist/hostlist-server.c
23 * @author Christian Grothoff
24 * @brief application to provide an integrated hostlist HTTP server
28 #include <microhttpd.h>
29 #include "hostlist-server.h"
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_peerinfo_service.h"
34 * How often should we recalculate our response to hostlist requests?
36 #define RESPONSE_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
39 * Handle to the HTTP server as provided by libmicrohttpd.
41 static struct MHD_Daemon *daemon_handle;
46 static const struct GNUNET_CONFIGURATION_Handle *cfg;
51 static struct GNUNET_SCHEDULER_Handle *sched;
56 static GNUNET_SCHEDULER_TaskIdentifier hostlist_task;
59 * Our canonical response.
61 static struct MHD_Response *response;
64 * Context for host processor.
75 * Task that will produce a new response object.
78 update_response (void *cls,
79 const struct GNUNET_SCHEDULER_TaskContext *tc);
83 * Function that assembles our response.
86 finish_response (struct HostSet *results)
89 MHD_destroy_response (response);
90 response = MHD_create_response_from_data (results->size,
91 results->data, MHD_YES, MHD_NO);
92 GNUNET_free (results);
93 /* schedule next update of the response */
94 GNUNET_SCHEDULER_add_delayed (sched,
95 RESPONSE_UPDATE_FREQUENCY,
102 * Callback that processes each of the known HELLOs for the
103 * hostlist response construction.
106 host_processor (void *cls,
107 const struct GNUNET_PeerIdentity * peer,
108 const struct GNUNET_HELLO_Message *hello,
111 struct HostSet *results = cls;
117 finish_response (results);
121 s = GNUNET_HELLO_size(hello);
122 if (old + s >= GNUNET_MAX_MALLOC_CHECKED)
123 return; /* too large, skip! */
124 GNUNET_array_grow (results->data,
127 memcpy (&results->data[old], hello, s);
132 * Task that will produce a new response object.
135 update_response (void *cls,
136 const struct GNUNET_SCHEDULER_TaskContext *tc)
138 struct HostSet *results;
140 results = GNUNET_malloc(sizeof(struct HostSet));
141 GNUNET_PEERINFO_for_all (cfg, sched,
144 GNUNET_TIME_UNIT_MINUTES,
147 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
148 _("Created new hostlist response with %u bytes\n"),
154 * Hostlist access policy (very permissive, allows everything).
157 accept_policy_callback (void *cls,
158 const struct sockaddr *addr, socklen_t addrlen)
160 return MHD_YES; /* accept all */
165 * Main request handler.
168 access_handler_callback (void *cls,
169 struct MHD_Connection *connection,
173 const char *upload_data,
174 size_t*upload_data_size, void **con_cls)
178 if (0 != strcmp (method, MHD_HTTP_METHOD_GET))
180 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
181 _("Received request for our hostlist\n"));
182 if (NULL == *con_cls)
185 return MHD_YES; /* send 100 continue */
187 if (*upload_data_size != 0)
188 return MHD_NO; /* do not support upload data */
189 if (response == NULL)
190 return MHD_NO; /* internal error, no response yet */
191 return MHD_queue_response (connection, MHD_HTTP_OK, response);
196 * Function that queries MHD's select sets and
197 * starts the task waiting for them.
200 prepare_daemon (void);
204 * Call MHD to process pending requests and then go back
205 * and schedule the next run.
208 run_daemon (void *cls,
209 const struct GNUNET_SCHEDULER_TaskContext *tc)
211 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
217 * Function that queries MHD's select sets and
218 * starts the task waiting for them.
226 struct GNUNET_NETWORK_FDSet *wrs;
227 struct GNUNET_NETWORK_FDSet *wws;
228 struct GNUNET_NETWORK_FDSet *wes;
230 unsigned long long timeout;
232 struct GNUNET_TIME_Relative tv;
237 wrs = GNUNET_NETWORK_fdset_create ();
238 wes = GNUNET_NETWORK_fdset_create ();
239 wws = GNUNET_NETWORK_fdset_create ();
241 GNUNET_assert (MHD_YES ==
242 MHD_get_fdset (daemon_handle,
247 haveto = MHD_get_timeout (daemon_handle, &timeout);
248 if (haveto == MHD_YES)
249 tv.value = (uint64_t) timeout;
251 tv = GNUNET_TIME_UNIT_FOREVER_REL;
252 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
253 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
254 GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
256 = GNUNET_SCHEDULER_add_select (sched,
257 GNUNET_SCHEDULER_PRIORITY_HIGH,
258 GNUNET_SCHEDULER_NO_TASK,
264 GNUNET_NETWORK_fdset_destroy (wrs);
265 GNUNET_NETWORK_fdset_destroy (wws);
266 GNUNET_NETWORK_fdset_destroy (wes);
272 * Start server offering our hostlist.
274 * @return GNUNET_OK on success
277 GNUNET_HOSTLIST_server_start (const struct GNUNET_CONFIGURATION_Handle *c,
278 struct GNUNET_SCHEDULER_Handle *s,
279 struct GNUNET_STATISTICS_Handle *st)
281 unsigned long long port;
285 if (-1 == GNUNET_CONFIGURATION_get_value_number (cfg,
289 return GNUNET_SYSERR;
290 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
291 _("Hostlist service starts on port %llu\n"),
293 daemon_handle = MHD_start_daemon (MHD_USE_IPv6,
294 (unsigned short) port,
295 &accept_policy_callback,
297 &access_handler_callback,
299 MHD_OPTION_CONNECTION_LIMIT, 16,
300 MHD_OPTION_PER_IP_CONNECTION_LIMIT, 1,
301 MHD_OPTION_CONNECTION_TIMEOUT, 16,
302 MHD_OPTION_CONNECTION_MEMORY_LIMIT,
303 16 * 1024, MHD_OPTION_END);
304 if (daemon_handle == NULL)
306 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
307 _("Could not start hostlist HTTP server on port %u\n"),
308 (unsigned short) port);
309 return GNUNET_SYSERR;
316 * Stop server offering our hostlist.
319 GNUNET_HOSTLIST_server_stop ()
321 GNUNET_SCHEDULER_cancel (sched, hostlist_task);
322 hostlist_task = GNUNET_SCHEDULER_NO_TASK;
323 MHD_stop_daemon (daemon_handle);
324 daemon_handle = NULL;
327 /* end of hostlist-server.c */