2 This file is part of GNUnet.
3 (C) 2008 Christian Grothoff (and other contributing authors)
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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.
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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.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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 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,
96 GNUNET_SCHEDULER_PRIORITY_IDLE,
97 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
98 RESPONSE_UPDATE_FREQUENCY,
105 * Callback that processes each of the known HELLOs for the
106 * hostlist response construction.
109 host_processor (void *cls,
110 const struct GNUNET_PeerIdentity * peer,
111 const struct GNUNET_HELLO_Message *hello,
114 struct HostSet *results = cls;
119 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,
151 * Hostlist access policy (very permissive, allows everything).
154 accept_policy_callback (void *cls,
155 const struct sockaddr *addr, socklen_t addrlen)
157 return MHD_YES; /* accept all */
162 * Main request handler.
165 access_handler_callback (void *cls,
166 struct MHD_Connection *connection,
170 const char *upload_data,
171 unsigned int *upload_data_size, void **con_cls)
175 if (0 != strcmp (method, MHD_HTTP_METHOD_GET))
177 if (NULL == *con_cls)
180 return MHD_YES; /* send 100 continue */
182 if (*upload_data_size != 0)
183 return MHD_NO; /* do not support upload data */
184 if (response == NULL)
185 return MHD_NO; /* internal error, no response yet */
186 return MHD_queue_response (connection, MHD_HTTP_OK, response);
191 * Function that queries MHD's select sets and
192 * starts the task waiting for them.
195 prepare_daemon (void);
199 * Call MHD to process pending requests and then go back
200 * and schedule the next run.
203 run_daemon (void *cls,
204 const struct GNUNET_SCHEDULER_TaskContext *tc)
206 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
212 * Function that queries MHD's select sets and
213 * starts the task waiting for them.
222 unsigned long long timeout;
224 struct GNUNET_TIME_Relative tv;
230 GNUNET_assert (MHD_YES ==
231 MHD_get_fdset (daemon_handle,
236 haveto = MHD_get_timeout (daemon_handle, &timeout);
237 if (haveto == MHD_YES)
238 tv.value = (uint64_t) timeout;
240 tv = GNUNET_TIME_UNIT_FOREVER_REL;
242 = GNUNET_SCHEDULER_add_select (sched,
244 GNUNET_SCHEDULER_PRIORITY_HIGH,
245 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
257 * Start server offering our hostlist.
259 * @return GNUNET_OK on success
262 GNUNET_HOSTLIST_server_start (struct GNUNET_CONFIGURATION_Handle *c,
263 struct GNUNET_SCHEDULER_Handle *s,
264 struct GNUNET_STATISTICS_Handle *st)
266 unsigned long long port;
270 if (-1 == GNUNET_CONFIGURATION_get_value_number (cfg,
274 return GNUNET_SYSERR;
275 daemon_handle = MHD_start_daemon (MHD_USE_IPv6,
276 (unsigned short) port,
277 &accept_policy_callback,
279 &access_handler_callback,
281 MHD_OPTION_CONNECTION_LIMIT, 16,
282 MHD_OPTION_PER_IP_CONNECTION_LIMIT, 1,
283 MHD_OPTION_CONNECTION_TIMEOUT, 16,
284 MHD_OPTION_CONNECTION_MEMORY_LIMIT,
285 16 * 1024, MHD_OPTION_END);
286 if (daemon_handle == NULL)
288 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
289 _("Could not start hostlist HTTP server on port %u\n"),
290 (unsigned short) port);
291 return GNUNET_SYSERR;
298 * Stop server offering our hostlist.
301 GNUNET_HOSTLIST_server_stop ()
303 GNUNET_SCHEDULER_cancel (sched, hostlist_task);
304 hostlist_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
305 MHD_stop_daemon (daemon_handle);
306 daemon_handle = NULL;
309 /* end of hostlist-server.c */