2 This file is part of GNUnet.
3 (C) 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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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"
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)
182 return; /* too large, skip! */
183 GNUNET_array_grow (results->data,
186 memcpy (&results->data[old], hello, s);
191 * Task that will produce a new response object.
194 update_response (void *cls,
195 const struct GNUNET_SCHEDULER_TaskContext *tc)
197 struct HostSet *results;
199 response_task = GNUNET_SCHEDULER_NO_TASK;
200 results = GNUNET_malloc(sizeof(struct HostSet));
201 pitr = GNUNET_PEERINFO_iterate (cfg, sched,
204 GNUNET_TIME_UNIT_MINUTES,
211 * Hostlist access policy (very permissive, allows everything).
214 accept_policy_callback (void *cls,
215 const struct sockaddr *addr, socklen_t addrlen)
217 if (NULL == response)
219 #if DEBUG_HOSTLIST_SERVER
220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
221 "Received request for hostlist, but I am not yet ready; rejecting!\n");
225 return MHD_YES; /* accept all */
230 * Main request handler.
233 access_handler_callback (void *cls,
234 struct MHD_Connection *connection,
238 const char *upload_data,
239 size_t*upload_data_size, void **con_cls)
243 if (0 != strcmp (method, MHD_HTTP_METHOD_GET))
245 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
246 _("Refusing `%s' request to hostlist server\n"),
248 GNUNET_STATISTICS_update (stats,
249 gettext_noop("hostlist requests refused (not HTTP GET)"),
254 if (NULL == *con_cls)
257 #if DEBUG_HOSTLIST_SERVER
258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
259 _("Sending 100 CONTINUE reply\n"));
261 return MHD_YES; /* send 100 continue */
263 if (*upload_data_size != 0)
265 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
266 _("Refusing `%s' request with %llu bytes of upload data\n"),
268 (unsigned long long) *upload_data_size);
269 GNUNET_STATISTICS_update (stats,
270 gettext_noop("hostlist requests refused (upload data)"),
273 return MHD_NO; /* do not support upload data */
275 if (response == NULL)
277 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
278 _("Could not handle hostlist request since I do not have a response yet\n"));
279 GNUNET_STATISTICS_update (stats,
280 gettext_noop("hostlist requests refused (not ready)"),
283 return MHD_NO; /* internal error, no response yet */
285 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
286 _("Received request for our hostlist\n"));
287 GNUNET_STATISTICS_update (stats,
288 gettext_noop("hostlist requests processed"),
291 return MHD_queue_response (connection, MHD_HTTP_OK, response);
296 * Function that queries MHD's select sets and
297 * starts the task waiting for them.
299 static GNUNET_SCHEDULER_TaskIdentifier
300 prepare_daemon (struct MHD_Daemon *daemon_handle);
303 * Call MHD to process pending requests and then go back
304 * and schedule the next run.
307 run_daemon (void *cls,
308 const struct GNUNET_SCHEDULER_TaskContext *tc)
310 struct MHD_Daemon *daemon_handle = cls;
312 if (daemon_handle == daemon_handle_v4)
313 hostlist_task_v4 = GNUNET_SCHEDULER_NO_TASK;
315 hostlist_task_v6 = GNUNET_SCHEDULER_NO_TASK;
317 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
319 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
320 if (daemon_handle == daemon_handle_v4)
321 hostlist_task_v4 = prepare_daemon (daemon_handle);
323 hostlist_task_v6 = prepare_daemon (daemon_handle);
328 * Function that queries MHD's select sets and
329 * starts the task waiting for them.
331 static GNUNET_SCHEDULER_TaskIdentifier
332 prepare_daemon (struct MHD_Daemon *daemon_handle)
334 GNUNET_SCHEDULER_TaskIdentifier ret;
338 struct GNUNET_NETWORK_FDSet *wrs;
339 struct GNUNET_NETWORK_FDSet *wws;
340 struct GNUNET_NETWORK_FDSet *wes;
342 unsigned long long timeout;
344 struct GNUNET_TIME_Relative tv;
349 wrs = GNUNET_NETWORK_fdset_create ();
350 wes = GNUNET_NETWORK_fdset_create ();
351 wws = GNUNET_NETWORK_fdset_create ();
353 GNUNET_assert (MHD_YES ==
354 MHD_get_fdset (daemon_handle,
359 haveto = MHD_get_timeout (daemon_handle, &timeout);
360 if (haveto == MHD_YES)
361 tv.value = (uint64_t) timeout;
363 tv = GNUNET_TIME_UNIT_FOREVER_REL;
364 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
365 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
366 GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
367 ret = GNUNET_SCHEDULER_add_select (sched,
368 GNUNET_SCHEDULER_PRIORITY_HIGH,
369 GNUNET_SCHEDULER_NO_TASK,
375 GNUNET_NETWORK_fdset_destroy (wrs);
376 GNUNET_NETWORK_fdset_destroy (wws);
377 GNUNET_NETWORK_fdset_destroy (wes);
384 * Start server offering our hostlist.
386 * @return GNUNET_OK on success
389 GNUNET_HOSTLIST_server_start (const struct GNUNET_CONFIGURATION_Handle *c,
390 struct GNUNET_SCHEDULER_Handle *s,
391 struct GNUNET_STATISTICS_Handle *st)
393 unsigned long long port;
398 if (-1 == GNUNET_CONFIGURATION_get_value_number (cfg,
402 return GNUNET_SYSERR;
403 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
404 _("Hostlist service starts on port %llu\n"),
406 daemon_handle_v6 = MHD_start_daemon (MHD_USE_IPv6
407 #if DEBUG_HOSTLIST_SERVER
411 (unsigned short) port,
412 &accept_policy_callback,
414 &access_handler_callback,
416 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
417 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
418 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
419 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
421 daemon_handle_v4 = MHD_start_daemon (MHD_NO_FLAG
422 #if DEBUG_HOSTLIST_SERVER
426 (unsigned short) port,
427 &accept_policy_callback,
429 &access_handler_callback,
431 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
432 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
433 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
434 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
437 if ( (daemon_handle_v6 == NULL) &&
438 (daemon_handle_v4 == NULL) )
440 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
441 _("Could not start hostlist HTTP server on port %u\n"),
442 (unsigned short) port);
443 return GNUNET_SYSERR;
445 if (daemon_handle_v4 != NULL)
446 hostlist_task_v4 = prepare_daemon (daemon_handle_v4);
447 if (daemon_handle_v6 != NULL)
448 hostlist_task_v6 = prepare_daemon (daemon_handle_v6);
449 response_task = GNUNET_SCHEDULER_add_now (sched,
456 * Stop server offering our hostlist.
459 GNUNET_HOSTLIST_server_stop ()
461 #if DEBUG_HOSTLIST_SERVER
462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
463 "Hostlist server shutdown\n");
465 if (GNUNET_SCHEDULER_NO_TASK != hostlist_task_v6)
467 GNUNET_SCHEDULER_cancel (sched, hostlist_task_v6);
468 hostlist_task_v6 = GNUNET_SCHEDULER_NO_TASK;
470 if (GNUNET_SCHEDULER_NO_TASK != hostlist_task_v4)
472 GNUNET_SCHEDULER_cancel (sched, hostlist_task_v4);
473 hostlist_task_v4 = GNUNET_SCHEDULER_NO_TASK;
477 GNUNET_PEERINFO_iterate_cancel (pitr);
480 if (GNUNET_SCHEDULER_NO_TASK != response_task)
482 GNUNET_SCHEDULER_cancel (sched, response_task);
483 response_task = GNUNET_SCHEDULER_NO_TASK;
485 if (NULL != daemon_handle_v4)
487 MHD_stop_daemon (daemon_handle_v4);
488 daemon_handle_v4 = NULL;
490 if (NULL != daemon_handle_v6)
492 MHD_stop_daemon (daemon_handle_v6);
493 daemon_handle_v6 = NULL;
495 if (response != NULL)
497 MHD_destroy_response (response);
502 /* end of hostlist-server.c */