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22 * @file fs/gnunet-service-fs_cadet_server.c
23 * @brief non-anonymous file-transfer
24 * @author Christian Grothoff
27 * - PORT is set to old application type, unsure if we should keep
28 * it that way (fine for now)
31 #include "gnunet_constants.h"
32 #include "gnunet_util_lib.h"
33 #include "gnunet_cadet_service.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_applications.h"
36 #include "gnunet-service-fs.h"
37 #include "gnunet-service-fs_indexing.h"
38 #include "gnunet-service-fs_cadet.h"
41 * After how long do we termiante idle connections?
43 #define IDLE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
47 * A message in the queue to be written to the cadet.
54 struct WriteQueueItem *next;
59 struct WriteQueueItem *prev;
62 * Number of bytes of payload, allocated at the end of this struct.
69 * Information we keep around for each active cadeting client.
76 struct CadetClient *next;
81 struct CadetClient *prev;
84 * Channel for communication.
86 struct GNUNET_CADET_Channel *channel;
89 * Head of write queue.
91 struct WriteQueueItem *wqi_head;
94 * Tail of write queue.
96 struct WriteQueueItem *wqi_tail;
99 * Current active request to the datastore, if we have one pending.
101 struct GNUNET_DATASTORE_QueueEntry *qe;
104 * Task that is scheduled to asynchronously terminate the connection.
106 struct GNUNET_SCHEDULER_Task * terminate_task;
109 * Task that is scheduled to terminate idle connections.
111 struct GNUNET_SCHEDULER_Task * timeout_task;
114 * Size of the last write that was initiated.
122 * Listen port for incoming requests.
124 static struct GNUNET_CADET_Port *cadet_port;
127 * Head of DLL of cadet clients.
129 static struct CadetClient *sc_head;
132 * Tail of DLL of cadet clients.
134 static struct CadetClient *sc_tail;
137 * Number of active cadet clients in the 'sc_*'-DLL.
139 static unsigned int sc_count;
142 * Maximum allowed number of cadet clients.
144 static unsigned long long sc_count_max;
149 * Task run to asynchronously terminate the cadet due to timeout.
151 * @param cls the 'struct CadetClient'
154 timeout_cadet_task (void *cls)
156 struct CadetClient *sc = cls;
157 struct GNUNET_CADET_Channel *tun;
159 sc->timeout_task = NULL;
162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
163 "Timeout for inactive cadet client %p\n",
165 GNUNET_CADET_channel_destroy (tun);
170 * Reset the timeout for the cadet client (due to activity).
172 * @param sc client handle to reset timeout for
175 refresh_timeout_task (struct CadetClient *sc)
177 if (NULL != sc->timeout_task)
178 GNUNET_SCHEDULER_cancel (sc->timeout_task);
179 sc->timeout_task = GNUNET_SCHEDULER_add_delayed (IDLE_TIMEOUT,
186 * Check if we are done with the write queue, and if so tell CADET
187 * that we are ready to read more.
189 * @param cls where to process the write queue
192 continue_writing (void *cls)
194 struct CadetClient *sc = cls;
195 struct GNUNET_MQ_Handle *mq;
197 mq = GNUNET_CADET_get_mq (sc->channel);
198 if (0 != GNUNET_MQ_get_length (mq))
200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
201 "Write pending, waiting for it to complete\n");
204 refresh_timeout_task (sc);
205 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
206 "Finished processing cadet request from client %p, ready to receive the next one\n",
208 GNUNET_CADET_receive_done (sc->channel);
213 * Process a datum that was stored in the datastore.
215 * @param cls closure with the `struct CadetClient` which sent the query
216 * @param key key for the content
217 * @param size number of bytes in @a data
218 * @param data content stored
219 * @param type type of the content
220 * @param priority priority of the content
221 * @param anonymity anonymity-level for the content
222 * @param expiration expiration time for the content
223 * @param uid unique identifier for the datum;
224 * maybe 0 if no unique identifier is available
227 handle_datastore_reply (void *cls,
228 const struct GNUNET_HashCode *key,
231 enum GNUNET_BLOCK_Type type,
234 struct GNUNET_TIME_Absolute expiration,
237 struct CadetClient *sc = cls;
238 size_t msize = size + sizeof (struct CadetReplyMessage);
239 struct GNUNET_MQ_Envelope *env;
240 struct CadetReplyMessage *srm;
245 /* no result, this should not really happen, as for
246 non-anonymous routing only peers that HAVE the
247 answers should be queried; OTOH, this is not a
248 hard error as we might have had the answer in the
249 past and the user might have unindexed it. Hence
250 we log at level "INFO" for now. */
253 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
254 "Have no answer and the query was NULL\n");
258 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
259 "Have no answer for query `%s'\n",
262 GNUNET_STATISTICS_update (GSF_stats,
263 gettext_noop ("# queries received via CADET not answered"),
266 continue_writing (sc);
269 if (GNUNET_BLOCK_TYPE_FS_ONDEMAND == type)
271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
272 "Performing on-demand encoding for query %s\n",
275 GNUNET_FS_handle_on_demand_block (key,
283 &handle_datastore_reply,
286 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
287 "On-demand encoding request failed\n");
288 continue_writing (sc);
292 if (msize > GNUNET_SERVER_MAX_MESSAGE_SIZE)
295 continue_writing (sc);
298 GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
300 "Starting transmission of %u byte reply of type %d for query `%s' via cadet to %p\n",
305 env = GNUNET_MQ_msg_extra (srm,
307 GNUNET_MESSAGE_TYPE_FS_CADET_REPLY);
308 srm->type = htonl (type);
309 srm->expiration = GNUNET_TIME_absolute_hton (expiration);
310 GNUNET_memcpy (&srm[1],
313 GNUNET_MQ_notify_sent (env,
316 GNUNET_STATISTICS_update (GSF_stats,
317 gettext_noop ("# Blocks transferred via cadet"),
320 GNUNET_MQ_send (GNUNET_CADET_get_mq (sc->channel),
326 * Functions with this signature are called whenever a
327 * complete query message is received.
329 * @param cls closure with the `struct CadetClient`
330 * @param sqm the actual message
333 handle_request (void *cls,
334 const struct CadetQueryMessage *sqm)
336 struct CadetClient *sc = cls;
338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
339 "Received query for `%s' via cadet from client %p\n",
340 GNUNET_h2s (&sqm->query),
342 GNUNET_STATISTICS_update (GSF_stats,
343 gettext_noop ("# queries received via cadet"),
346 refresh_timeout_task (sc);
347 sc->qe = GNUNET_DATASTORE_get_key (GSF_dsh,
352 GSF_datastore_queue_size,
353 &handle_datastore_reply,
357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
358 "Queueing request with datastore failed (queue full?)\n");
359 continue_writing (sc);
365 * Functions of this type are called upon new cadet connection from other peers.
367 * @param cls the closure from GNUNET_CADET_connect
368 * @param channel the channel representing the cadet
369 * @param initiator the identity of the peer who wants to establish a cadet
370 * with us; NULL on binding error
371 * @return initial channel context (our `struct CadetClient`)
374 connect_cb (void *cls,
375 struct GNUNET_CADET_Channel *channel,
376 const struct GNUNET_PeerIdentity *initiator)
378 struct CadetClient *sc;
380 GNUNET_assert (NULL != channel);
381 if (sc_count >= sc_count_max)
383 GNUNET_STATISTICS_update (GSF_stats,
384 gettext_noop ("# cadet client connections rejected"),
387 GNUNET_CADET_channel_destroy (channel);
390 GNUNET_STATISTICS_update (GSF_stats,
391 gettext_noop ("# cadet connections active"),
394 sc = GNUNET_new (struct CadetClient);
395 sc->channel = channel;
396 GNUNET_CONTAINER_DLL_insert (sc_head,
400 refresh_timeout_task (sc);
401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
402 "Accepting inbound cadet connection from `%s' as client %p\n",
403 GNUNET_i2s (initiator),
410 * Function called by cadet when a client disconnects.
411 * Cleans up our `struct CadetClient` of that channel.
413 * @param cls our `struct CadetClient`
414 * @param channel channel of the disconnecting client
418 disconnect_cb (void *cls,
419 const struct GNUNET_CADET_Channel *channel)
421 struct CadetClient *sc = cls;
422 struct WriteQueueItem *wqi;
427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
428 "Terminating cadet connection with client %p\n",
430 GNUNET_STATISTICS_update (GSF_stats,
431 gettext_noop ("# cadet connections active"), -1,
433 if (NULL != sc->terminate_task)
434 GNUNET_SCHEDULER_cancel (sc->terminate_task);
435 if (NULL != sc->timeout_task)
436 GNUNET_SCHEDULER_cancel (sc->timeout_task);
438 GNUNET_DATASTORE_cancel (sc->qe);
439 while (NULL != (wqi = sc->wqi_head))
441 GNUNET_CONTAINER_DLL_remove (sc->wqi_head,
446 GNUNET_CONTAINER_DLL_remove (sc_head,
455 * Function called whenever an MQ-channel's transmission window size changes.
457 * The first callback in an outgoing channel will be with a non-zero value
458 * and will mean the channel is connected to the destination.
460 * For an incoming channel it will be called immediately after the
461 * #GNUNET_CADET_ConnectEventHandler, also with a non-zero value.
463 * @param cls Channel closure.
464 * @param channel Connection to the other end (henceforth invalid).
465 * @param window_size New window size. If the is more messages than buffer size
466 * this value will be negative..
469 window_change_cb (void *cls,
470 const struct GNUNET_CADET_Channel *channel,
473 /* FIXME: could do flow control here... */
478 * Initialize subsystem for non-anonymous file-sharing.
481 GSF_cadet_start_server ()
483 struct GNUNET_MQ_MessageHandler handlers[] = {
484 GNUNET_MQ_hd_fixed_size (request,
485 GNUNET_MESSAGE_TYPE_FS_CADET_QUERY,
486 struct CadetQueryMessage,
488 GNUNET_MQ_handler_end ()
490 struct GNUNET_HashCode port;
493 GNUNET_CONFIGURATION_get_value_number (GSF_cfg,
498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
499 "Initializing cadet FS server with a limit of %llu connections\n",
501 cadet_map = GNUNET_CONTAINER_multipeermap_create (16, GNUNET_YES);
502 cadet_handle = GNUNET_CADET_connecT (GSF_cfg);
503 GNUNET_assert (NULL != cadet_handle);
504 GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_FS_BLOCK_TRANSFER,
505 strlen (GNUNET_APPLICATION_PORT_FS_BLOCK_TRANSFER),
507 cadet_port = GNUNET_CADET_open_porT (cadet_handle,
518 * Shutdown subsystem for non-anonymous file-sharing.
521 GSF_cadet_stop_server ()
523 GNUNET_CONTAINER_multipeermap_iterate (cadet_map,
524 &GSF_cadet_release_clients,
526 GNUNET_CONTAINER_multipeermap_destroy (cadet_map);
528 if (NULL != cadet_port)
530 GNUNET_CADET_close_port (cadet_port);
533 if (NULL != cadet_handle)
535 GNUNET_CADET_disconnect (cadet_handle);
538 GNUNET_assert (NULL == sc_head);
539 GNUNET_assert (0 == sc_count);
542 /* end of gnunet-service-fs_cadet.c */