2 This file is part of GNUnet.
3 (C) 2008, 2009, 2010 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"
33 #define DEBUG_HOSTLIST_SERVER GNUNET_YES
36 * How often should we recalculate our response to hostlist requests?
38 #define RESPONSE_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
41 * Handle to the HTTP server as provided by libmicrohttpd for IPv6.
43 static struct MHD_Daemon *daemon_handle_v6;
46 * Handle to the HTTP server as provided by libmicrohttpd for IPv4.
48 static struct MHD_Daemon *daemon_handle_v4;
53 static const struct GNUNET_CONFIGURATION_Handle *cfg;
58 static struct GNUNET_SCHEDULER_Handle *sched;
61 * For keeping statistics.
63 static struct GNUNET_STATISTICS_Handle *stats;
66 * Our primary task for IPv4.
68 static GNUNET_SCHEDULER_TaskIdentifier hostlist_task_v4;
71 * Our primary task for IPv6.
73 static GNUNET_SCHEDULER_TaskIdentifier hostlist_task_v6;
76 * Task that updates our HTTP response.
78 static GNUNET_SCHEDULER_TaskIdentifier response_task;
81 * Our canonical response.
83 static struct MHD_Response *response;
86 * NULL if we are not currenlty iterating over peer information.
88 static struct GNUNET_PEERINFO_IteratorContext *pitr;
91 * Context for host processor.
102 * Task that will produce a new response object.
105 update_response (void *cls,
106 const struct GNUNET_SCHEDULER_TaskContext *tc);
110 * Function that assembles our response.
113 finish_response (struct HostSet *results)
115 struct GNUNET_TIME_Relative freq;
117 if (response != NULL)
118 MHD_destroy_response (response);
119 #if DEBUG_HOSTLIST_SERVER
120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
121 "Creating hostlist response with %u bytes\n",
122 (unsigned int) results->size);
124 response = MHD_create_response_from_data (results->size,
125 results->data, MHD_YES, MHD_NO);
126 if ( (daemon_handle_v4 != NULL) ||
127 (daemon_handle_v6 != NULL) )
129 freq = RESPONSE_UPDATE_FREQUENCY;
130 if (results->size == 0)
131 freq = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 250);
132 /* schedule next update of the response */
133 response_task = GNUNET_SCHEDULER_add_delayed (sched,
140 /* already past shutdown */
141 MHD_destroy_response (response);
144 GNUNET_STATISTICS_set (stats,
145 gettext_noop("bytes in hostlist"),
148 GNUNET_free (results);
153 * Callback that processes each of the known HELLOs for the
154 * hostlist response construction.
157 host_processor (void *cls,
158 const struct GNUNET_PeerIdentity * peer,
159 const struct GNUNET_HELLO_Message *hello,
162 struct HostSet *results = cls;
169 finish_response (results);
173 s = GNUNET_HELLO_size(hello);
174 #if DEBUG_HOSTLIST_SERVER
175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
176 "Received %u bytes of `%s' from peer `%s' for hostlist.\n",
181 if (old + s >= GNUNET_MAX_MALLOC_CHECKED)
183 GNUNET_STATISTICS_update (stats,
184 gettext_noop("bytes not included in hostlist (size limit)"),
187 return; /* too large, skip! */
189 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
190 "Adding peer `%s' to hostlist (%u bytes)\n",
193 GNUNET_array_grow (results->data,
196 memcpy (&results->data[old], hello, s);
201 * Task that will produce a new response object.
204 update_response (void *cls,
205 const struct GNUNET_SCHEDULER_TaskContext *tc)
207 struct HostSet *results;
209 response_task = GNUNET_SCHEDULER_NO_TASK;
210 results = GNUNET_malloc(sizeof(struct HostSet));
211 pitr = GNUNET_PEERINFO_iterate (cfg, sched,
214 GNUNET_TIME_UNIT_MINUTES,
221 * Hostlist access policy (very permissive, allows everything).
224 accept_policy_callback (void *cls,
225 const struct sockaddr *addr, socklen_t addrlen)
227 if (NULL == response)
229 #if DEBUG_HOSTLIST_SERVER
230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
231 "Received request for hostlist, but I am not yet ready; rejecting!\n");
235 return MHD_YES; /* accept all */
240 * Main request handler.
243 access_handler_callback (void *cls,
244 struct MHD_Connection *connection,
248 const char *upload_data,
249 size_t*upload_data_size, void **con_cls)
253 if (0 != strcmp (method, MHD_HTTP_METHOD_GET))
255 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
256 _("Refusing `%s' request to hostlist server\n"),
258 GNUNET_STATISTICS_update (stats,
259 gettext_noop("hostlist requests refused (not HTTP GET)"),
264 if (NULL == *con_cls)
267 #if DEBUG_HOSTLIST_SERVER
268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
269 _("Sending 100 CONTINUE reply\n"));
271 return MHD_YES; /* send 100 continue */
273 if (*upload_data_size != 0)
275 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
276 _("Refusing `%s' request with %llu bytes of upload data\n"),
278 (unsigned long long) *upload_data_size);
279 GNUNET_STATISTICS_update (stats,
280 gettext_noop("hostlist requests refused (upload data)"),
283 return MHD_NO; /* do not support upload data */
285 if (response == NULL)
287 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
288 _("Could not handle hostlist request since I do not have a response yet\n"));
289 GNUNET_STATISTICS_update (stats,
290 gettext_noop("hostlist requests refused (not ready)"),
293 return MHD_NO; /* internal error, no response yet */
295 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
296 _("Received request for our hostlist\n"));
297 GNUNET_STATISTICS_update (stats,
298 gettext_noop("hostlist requests processed"),
301 return MHD_queue_response (connection, MHD_HTTP_OK, response);
306 * Function that queries MHD's select sets and
307 * starts the task waiting for them.
309 static GNUNET_SCHEDULER_TaskIdentifier
310 prepare_daemon (struct MHD_Daemon *daemon_handle);
313 * Call MHD to process pending requests and then go back
314 * and schedule the next run.
317 run_daemon (void *cls,
318 const struct GNUNET_SCHEDULER_TaskContext *tc)
320 struct MHD_Daemon *daemon_handle = cls;
322 if (daemon_handle == daemon_handle_v4)
323 hostlist_task_v4 = GNUNET_SCHEDULER_NO_TASK;
325 hostlist_task_v6 = GNUNET_SCHEDULER_NO_TASK;
327 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
329 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
330 if (daemon_handle == daemon_handle_v4)
331 hostlist_task_v4 = prepare_daemon (daemon_handle);
333 hostlist_task_v6 = prepare_daemon (daemon_handle);
338 * Function that queries MHD's select sets and
339 * starts the task waiting for them.
341 static GNUNET_SCHEDULER_TaskIdentifier
342 prepare_daemon (struct MHD_Daemon *daemon_handle)
344 GNUNET_SCHEDULER_TaskIdentifier ret;
348 struct GNUNET_NETWORK_FDSet *wrs;
349 struct GNUNET_NETWORK_FDSet *wws;
350 struct GNUNET_NETWORK_FDSet *wes;
352 unsigned long long timeout;
354 struct GNUNET_TIME_Relative tv;
359 wrs = GNUNET_NETWORK_fdset_create ();
360 wes = GNUNET_NETWORK_fdset_create ();
361 wws = GNUNET_NETWORK_fdset_create ();
363 GNUNET_assert (MHD_YES ==
364 MHD_get_fdset (daemon_handle,
369 haveto = MHD_get_timeout (daemon_handle, &timeout);
370 if (haveto == MHD_YES)
371 tv.value = (uint64_t) timeout;
373 tv = GNUNET_TIME_UNIT_FOREVER_REL;
374 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
375 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
376 GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
377 ret = GNUNET_SCHEDULER_add_select (sched,
378 GNUNET_SCHEDULER_PRIORITY_HIGH,
379 GNUNET_SCHEDULER_NO_TASK,
385 GNUNET_NETWORK_fdset_destroy (wrs);
386 GNUNET_NETWORK_fdset_destroy (wws);
387 GNUNET_NETWORK_fdset_destroy (wes);
394 * Start server offering our hostlist.
396 * @return GNUNET_OK on success
399 GNUNET_HOSTLIST_server_start (const struct GNUNET_CONFIGURATION_Handle *c,
400 struct GNUNET_SCHEDULER_Handle *s,
401 struct GNUNET_STATISTICS_Handle *st)
403 unsigned long long port;
408 if (-1 == GNUNET_CONFIGURATION_get_value_number (cfg,
412 return GNUNET_SYSERR;
413 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
414 _("Hostlist service starts on port %llu\n"),
416 daemon_handle_v6 = MHD_start_daemon (MHD_USE_IPv6
417 #if DEBUG_HOSTLIST_SERVER
421 (unsigned short) port,
422 &accept_policy_callback,
424 &access_handler_callback,
426 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
427 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
428 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
429 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
431 daemon_handle_v4 = MHD_start_daemon (MHD_NO_FLAG
432 #if DEBUG_HOSTLIST_SERVER
436 (unsigned short) port,
437 &accept_policy_callback,
439 &access_handler_callback,
441 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
442 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
443 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
444 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
447 if ( (daemon_handle_v6 == NULL) &&
448 (daemon_handle_v4 == NULL) )
450 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
451 _("Could not start hostlist HTTP server on port %u\n"),
452 (unsigned short) port);
453 return GNUNET_SYSERR;
455 if (daemon_handle_v4 != NULL)
456 hostlist_task_v4 = prepare_daemon (daemon_handle_v4);
457 if (daemon_handle_v6 != NULL)
458 hostlist_task_v6 = prepare_daemon (daemon_handle_v6);
459 response_task = GNUNET_SCHEDULER_add_now (sched,
466 * Stop server offering our hostlist.
469 GNUNET_HOSTLIST_server_stop ()
471 #if DEBUG_HOSTLIST_SERVER
472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
473 "Hostlist server shutdown\n");
475 if (GNUNET_SCHEDULER_NO_TASK != hostlist_task_v6)
477 GNUNET_SCHEDULER_cancel (sched, hostlist_task_v6);
478 hostlist_task_v6 = GNUNET_SCHEDULER_NO_TASK;
480 if (GNUNET_SCHEDULER_NO_TASK != hostlist_task_v4)
482 GNUNET_SCHEDULER_cancel (sched, hostlist_task_v4);
483 hostlist_task_v4 = GNUNET_SCHEDULER_NO_TASK;
487 GNUNET_PEERINFO_iterate_cancel (pitr);
490 if (GNUNET_SCHEDULER_NO_TASK != response_task)
492 GNUNET_SCHEDULER_cancel (sched, response_task);
493 response_task = GNUNET_SCHEDULER_NO_TASK;
495 if (NULL != daemon_handle_v4)
497 MHD_stop_daemon (daemon_handle_v4);
498 daemon_handle_v4 = NULL;
500 if (NULL != daemon_handle_v6)
502 MHD_stop_daemon (daemon_handle_v6);
503 daemon_handle_v6 = NULL;
505 if (response != NULL)
507 MHD_destroy_response (response);
512 /* end of hostlist-server.c */