2 This file is part of GNUnet
3 (C) 2013 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 3, 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 set/gnunet-service-set.c
23 * @brief two-peer set operations
24 * @author Florian Dold
26 #include "gnunet-service-set.h"
27 #include "set_protocol.h"
31 * Peer that has connected to us, but is not yet evaluating a set operation.
32 * Once the peer has sent a request, and the client has
33 * accepted or rejected it, this information will be deleted.
38 * Incoming peers are held in a linked list
40 struct Incoming *next;
43 * Incoming peers are held in a linked list
45 struct Incoming *prev;
48 * Detail information about the operation.
49 * NULL as long as we did not receive the operation
50 * request from the remote peer.
52 struct OperationSpecification *spec;
55 * The identity of the requesting peer. Needs to
56 * be stored here as the op spec might not have been created yet.
58 struct GNUNET_PeerIdentity peer;
63 struct GNUNET_MESH_Tunnel *tunnel;
66 * Unique request id for the request from
67 * a remote peer, sent to the client, which will
68 * accept or reject the request.
69 * Set to '0' iff the request has not been
75 * Timeout task, if the incoming peer has not been accepted
76 * after the timeout, it will be disconnected.
78 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
81 * Tunnel context, needs to be stored here as a client's accept will change
84 struct TunnelContext *tc;
89 * A listener is inhabited by a client, and
90 * waits for evaluation requests from remote peers.
95 * Listeners are held in a doubly linked list.
97 struct Listener *next;
100 * Listeners are held in a doubly linked list.
102 struct Listener *prev;
105 * Client that owns the listener.
106 * Only one client may own a listener.
108 struct GNUNET_SERVER_Client *client;
111 * Message queue for the client
113 struct GNUNET_MQ_Handle *client_mq;
116 * The type of the operation.
118 enum GNUNET_SET_OperationType operation;
121 * Application ID for the operation, used to distinguish
122 * multiple operations of the same type with the same peer.
124 struct GNUNET_HashCode app_id;
129 * Configuration of our local peer.
131 static const struct GNUNET_CONFIGURATION_Handle *configuration;
134 * Handle to the mesh service, used
135 * to listen for and connect to remote peers.
137 static struct GNUNET_MESH_Handle *mesh;
140 * Sets are held in a doubly linked list.
142 static struct Set *sets_head;
145 * Sets are held in a doubly linked list.
147 static struct Set *sets_tail;
150 * Listeners are held in a doubly linked list.
152 static struct Listener *listeners_head;
155 * Listeners are held in a doubly linked list.
157 static struct Listener *listeners_tail;
160 * Incoming sockets from remote peers are
161 * held in a doubly linked list.
163 static struct Incoming *incoming_head;
166 * Incoming sockets from remote peers are
167 * held in a doubly linked list.
169 static struct Incoming *incoming_tail;
172 * Counter for allocating unique IDs for clients,
173 * used to identify incoming operation requests from remote peers,
174 * that the client can choose to accept or refuse.
176 static uint32_t suggest_id = 1;
180 * Get set that is owned by the given client, if any.
182 * @param client client to look for
183 * @return set that the client owns, NULL if the client
187 set_get (struct GNUNET_SERVER_Client *client)
191 for (set = sets_head; NULL != set; set = set->next)
192 if (set->client == client)
199 * Get the listener associated with the given client, if any.
201 * @param client the client
202 * @return listener associated with the client, NULL
205 static struct Listener *
206 listener_get (struct GNUNET_SERVER_Client *client)
208 struct Listener *listener;
210 for (listener = listeners_head; NULL != listener; listener = listener->next)
211 if (listener->client == client)
218 * Get the incoming socket associated with the given id.
220 * @param id id to look for
221 * @return the incoming socket associated with the id,
222 * or NULL if there is none
224 static struct Incoming *
225 get_incoming (uint32_t id)
227 struct Incoming *incoming;
229 for (incoming = incoming_head; NULL != incoming; incoming = incoming->next)
230 if (incoming->suggest_id == id)
237 * Destroy a listener, free all resources associated with it.
239 * @param listener listener to destroy
242 listener_destroy (struct Listener *listener)
244 /* If the client is not dead yet, destroy it.
245 * The client's destroy callback will destroy the listener again. */
246 if (NULL != listener->client)
248 struct GNUNET_SERVER_Client *client = listener->client;
249 listener->client = NULL;
250 GNUNET_SERVER_client_disconnect (client);
253 if (NULL != listener->client_mq)
255 GNUNET_MQ_destroy (listener->client_mq);
256 listener->client_mq = NULL;
258 GNUNET_CONTAINER_DLL_remove (listeners_head, listeners_tail, listener);
259 GNUNET_free (listener);
264 * Iterator over hash map entries.
267 * @param key current key code
268 * @param value value in the hash map
269 * @return GNUNET_YES if we should continue to
274 destroy_elements_iterator (void *cls,
275 const struct GNUNET_HashCode * key,
278 struct ElementEntry *ee = value;
286 * Destroy a set, and free all resources associated with it.
288 * @param set the set to destroy
291 set_destroy (struct Set *set)
293 /* If the client is not dead yet, destroy it.
294 * The client's destroy callback will destroy the set again.
295 * We do this so that the tunnel end handler still has a valid set handle
297 if (NULL != set->client)
299 struct GNUNET_SERVER_Client *client = set->client;
301 GNUNET_SERVER_client_disconnect (client);
304 GNUNET_assert (NULL != set->state);
305 set->vt->destroy_set (set->state);
307 if (NULL != set->client_mq)
309 GNUNET_MQ_destroy (set->client_mq);
310 set->client_mq = NULL;
312 if (NULL != set->iter)
314 GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
317 GNUNET_CONTAINER_DLL_remove (sets_head, sets_tail, set);
318 if (NULL != set->elements)
320 GNUNET_CONTAINER_multihashmap_iterate (set->elements,
321 destroy_elements_iterator, NULL);
322 GNUNET_CONTAINER_multihashmap_destroy (set->elements);
323 set->elements = NULL;
330 * Clean up after a client after it is
331 * disconnected (either by us or by itself)
333 * @param cls closure, unused
334 * @param client the client to clean up after
337 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
340 struct Listener *listener;
342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected, cleaning up\n");
344 set = set_get (client);
349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "(client's set destroyed)\n");
351 listener = listener_get (client);
352 if (NULL != listener)
354 listener->client = NULL;
355 listener_destroy (listener);
356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "(client's listener destroyed)\n");
362 * Destroy an incoming request from a remote peer
364 * @param incoming remote request to destroy
367 incoming_destroy (struct Incoming *incoming)
369 GNUNET_CONTAINER_DLL_remove (incoming_head, incoming_tail, incoming);
370 if (GNUNET_SCHEDULER_NO_TASK != incoming->timeout_task)
372 GNUNET_SCHEDULER_cancel (incoming->timeout_task);
373 incoming->timeout_task = GNUNET_SCHEDULER_NO_TASK;
375 if (NULL != incoming->tunnel)
377 struct GNUNET_MESH_Tunnel *t = incoming->tunnel;
378 incoming->tunnel = NULL;
379 GNUNET_MESH_tunnel_destroy (t);
382 GNUNET_free (incoming);
386 static struct Listener *
387 listener_get_by_target (enum GNUNET_SET_OperationType op,
388 const struct GNUNET_HashCode *app_id)
392 for (l = listeners_head; NULL != l; l = l->next)
394 if (l->operation != op)
396 if (0 != GNUNET_CRYPTO_hash_cmp (app_id, &l->app_id))
405 * Suggest the given request to the listener,
406 * who can accept or reject the request.
408 * @param incoming the incoming peer with the request to suggest
409 * @param listener the listener to suggest the request to
412 incoming_suggest (struct Incoming *incoming, struct Listener *listener)
414 struct GNUNET_MQ_Envelope *mqm;
415 struct GNUNET_SET_RequestMessage *cmsg;
417 GNUNET_assert (0 == incoming->suggest_id);
418 GNUNET_assert (NULL != incoming->spec);
419 incoming->suggest_id = suggest_id++;
421 GNUNET_SCHEDULER_cancel (incoming->timeout_task);
422 incoming->timeout_task = GNUNET_SCHEDULER_NO_TASK;
423 mqm = GNUNET_MQ_msg_nested_mh (cmsg, GNUNET_MESSAGE_TYPE_SET_REQUEST,
424 incoming->spec->context_msg);
425 GNUNET_assert (NULL != mqm);
426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "suggesting request with accept id %u\n",
427 incoming->suggest_id);
428 cmsg->accept_id = htonl (incoming->suggest_id);
429 cmsg->peer_id = incoming->spec->peer;
430 GNUNET_MQ_send (listener->client_mq, mqm);
435 * Handle a request for a set operation from
438 * @param op the operation state
439 * @param mh the received message
440 * @return GNUNET_OK if the tunnel should be kept alive,
441 * GNUNET_SYSERR to destroy the tunnel
444 handle_incoming_msg (struct OperationState *op,
445 const struct GNUNET_MessageHeader *mh)
447 struct Incoming *incoming = (struct Incoming *) op;
448 const struct OperationRequestMessage *msg = (const struct OperationRequestMessage *) mh;
449 struct Listener *listener;
450 struct OperationSpecification *spec;
452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got op request\n");
454 if (GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST != ntohs (mh->type))
457 return GNUNET_SYSERR;
460 if (NULL != incoming->spec)
462 /* double operation request */
464 return GNUNET_SYSERR;
467 spec = GNUNET_new (struct OperationSpecification);
468 spec->context_msg = GNUNET_MQ_extract_nested_mh (msg);
469 if (NULL != spec->context_msg)
470 spec->context_msg = GNUNET_copy_message (spec->context_msg);
471 spec->operation = ntohl (msg->operation);
472 spec->app_id = msg->app_id;
473 spec->salt = ntohl (msg->salt);
474 spec->peer = incoming->peer;
476 incoming->spec = spec;
478 if ( (NULL != spec->context_msg) &&
479 (ntohs (spec->context_msg->size) > GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE) )
482 return GNUNET_SYSERR;
485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "received P2P operation request (op %u, app %s)\n",
486 ntohl (msg->operation), GNUNET_h2s (&msg->app_id));
487 listener = listener_get_by_target (ntohl (msg->operation), &msg->app_id);
488 if (NULL == listener)
490 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
491 "no listener matches incoming request, waiting with timeout\n");
494 incoming_suggest (incoming, listener);
500 send_client_element (struct Set *set)
503 struct ElementEntry *ee;
504 struct GNUNET_MQ_Envelope *ev;
506 GNUNET_assert (NULL != set->iter);
507 ret = GNUNET_CONTAINER_multihashmap_iterator_next (set->iter, NULL, (const void **) &ee);
508 if (GNUNET_NO == ret)
510 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_DONE);
514 struct GNUNET_SET_IterResponseMessage *msg;
516 GNUNET_assert (NULL != ee);
517 ev = GNUNET_MQ_msg_extra (msg, ee->element.size, GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT);
518 memcpy (&msg[1], ee->element.data, ee->element.size);
519 msg->element_type = ee->element.type;
521 GNUNET_MQ_send (set->client_mq, ev);
526 * Called when a client wants to iterate the elements of a set.
529 * @param client client that sent the message
530 * @param m message sent by the client
533 handle_client_iterate (void *cls,
534 struct GNUNET_SERVER_Client *client,
535 const struct GNUNET_MessageHeader *m)
539 set = set_get (client);
543 GNUNET_SERVER_client_disconnect (client);
547 if (NULL != set->iter)
550 GNUNET_SERVER_client_disconnect (client);
553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "iterating union set with %u elements\n",
554 GNUNET_CONTAINER_multihashmap_size (set->elements));
555 GNUNET_SERVER_receive_done (client, GNUNET_OK);
556 set->iter = GNUNET_CONTAINER_multihashmap_iterator_create (set->elements);
557 send_client_element (set);
562 * Called when a client wants to create a new set.
565 * @param client client that sent the message
566 * @param m message sent by the client
569 handle_client_create (void *cls,
570 struct GNUNET_SERVER_Client *client,
571 const struct GNUNET_MessageHeader *m)
573 struct GNUNET_SET_CreateMessage *msg = (struct GNUNET_SET_CreateMessage *) m;
576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client created new set (operation %u)\n",
577 ntohs (msg->operation));
579 if (NULL != set_get (client))
582 GNUNET_SERVER_client_disconnect (client);
586 set = GNUNET_new (struct Set);
588 switch (ntohs (msg->operation))
590 case GNUNET_SET_OPERATION_INTERSECTION:
591 // set->vt = _GSS_intersection_vt ();
593 case GNUNET_SET_OPERATION_UNION:
594 set->vt = _GSS_union_vt ();
599 GNUNET_SERVER_client_disconnect (client);
603 set->state = set->vt->create ();
604 set->elements = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
605 set->client = client;
606 set->client_mq = GNUNET_MQ_queue_for_server_client (client);
607 GNUNET_CONTAINER_DLL_insert (sets_head, sets_tail, set);
608 GNUNET_SERVER_receive_done (client, GNUNET_OK);
613 * Called when a client wants to create a new listener.
616 * @param client client that sent the message
617 * @param m message sent by the client
620 handle_client_listen (void *cls,
621 struct GNUNET_SERVER_Client *client,
622 const struct GNUNET_MessageHeader *m)
624 struct GNUNET_SET_ListenMessage *msg = (struct GNUNET_SET_ListenMessage *) m;
625 struct Listener *listener;
626 struct Incoming *incoming;
628 if (NULL != listener_get (client))
631 GNUNET_SERVER_client_disconnect (client);
634 listener = GNUNET_new (struct Listener);
635 listener->client = client;
636 listener->client_mq = GNUNET_MQ_queue_for_server_client (client);
637 listener->app_id = msg->app_id;
638 listener->operation = ntohl (msg->operation);
639 GNUNET_CONTAINER_DLL_insert_tail (listeners_head, listeners_tail, listener);
640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new listener created (op %u, app %s)\n",
641 listener->operation, GNUNET_h2s (&listener->app_id));
642 for (incoming = incoming_head; NULL != incoming; incoming = incoming->next)
644 if (NULL == incoming->spec)
646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "request has no spec yet\n");
649 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "considering (op: %u, app: %s, suggest: %u)\n",
650 incoming->spec->operation, GNUNET_h2s (&incoming->spec->app_id), incoming->suggest_id);
652 if (0 != incoming->suggest_id)
654 if (listener->operation != incoming->spec->operation)
656 if (0 != GNUNET_CRYPTO_hash_cmp (&listener->app_id, &incoming->spec->app_id))
658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "request suggested\n");
659 incoming_suggest (incoming, listener);
661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "considered all incoming requests\n");
662 GNUNET_SERVER_receive_done (client, GNUNET_OK);
667 * Called when the client wants to reject an operation
668 * request from another peer.
671 * @param client client that sent the message
672 * @param m message sent by the client
675 handle_client_reject (void *cls,
676 struct GNUNET_SERVER_Client *client,
677 const struct GNUNET_MessageHeader *m)
679 struct Incoming *incoming;
680 const struct GNUNET_SET_AcceptRejectMessage *msg;
682 msg = (const struct GNUNET_SET_AcceptRejectMessage *) m;
683 GNUNET_break (0 == ntohl (msg->request_id));
685 incoming = get_incoming (ntohl (msg->accept_reject_id));
686 if (NULL == incoming)
688 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer request rejected by client\n");
692 GNUNET_MESH_tunnel_destroy (incoming->tunnel);
693 GNUNET_SERVER_receive_done (client, GNUNET_OK);
698 * Called when a client wants to add an element to a
702 * @param client client that sent the message
703 * @param m message sent by the client
706 handle_client_add_remove (void *cls,
707 struct GNUNET_SERVER_Client *client,
708 const struct GNUNET_MessageHeader *m)
711 const struct GNUNET_SET_ElementMessage *msg;
712 struct GNUNET_SET_Element el;
713 struct ElementEntry *ee;
715 set = set_get (client);
719 GNUNET_SERVER_client_disconnect (client);
722 GNUNET_SERVER_receive_done (client, GNUNET_OK);
723 msg = (const struct GNUNET_SET_ElementMessage *) m;
724 el.size = ntohs (m->size) - sizeof *msg;
725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
726 "client ins/rem element of size %u\n", el.size);
728 if (GNUNET_MESSAGE_TYPE_SET_REMOVE == ntohs (m->type))
730 struct GNUNET_HashCode hash;
732 GNUNET_CRYPTO_hash (el.data, el.size, &hash);
733 ee = GNUNET_CONTAINER_multihashmap_get (set->elements, &hash);
736 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to remove non-existing element\n");
739 if (GNUNET_YES == ee->removed)
741 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to remove element twice\n");
744 ee->removed = GNUNET_YES;
745 ee->generation_removed = set->current_generation;
746 set->vt->remove (set->state, ee);
750 struct ElementEntry *ee_dup;
752 ee = GNUNET_malloc (el.size + sizeof *ee);
753 ee->element.size = el.size;
754 memcpy (&ee[1], el.data, el.size);
755 ee->element.data = &ee[1];
756 ee->generation_added = set->current_generation;
757 ee->remote = GNUNET_NO;
758 GNUNET_CRYPTO_hash (ee->element.data, el.size, &ee->element_hash);
759 ee_dup = GNUNET_CONTAINER_multihashmap_get (set->elements,
763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "element inserted twice, ignoring\n");
767 GNUNET_CONTAINER_multihashmap_put (set->elements, &ee->element_hash, ee,
768 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
769 set->vt->add (set->state, ee);
775 * Called when a client wants to evaluate a set operation with another peer.
778 * @param client client that sent the message
779 * @param m message sent by the client
782 handle_client_evaluate (void *cls,
783 struct GNUNET_SERVER_Client *client,
784 const struct GNUNET_MessageHeader *m)
787 struct TunnelContext *tc;
788 struct GNUNET_MESH_Tunnel *tunnel;
789 struct GNUNET_SET_EvaluateMessage *msg;
790 struct OperationSpecification *spec;
792 set = set_get (client);
796 GNUNET_SERVER_client_disconnect (client);
800 msg = (struct GNUNET_SET_EvaluateMessage *) m;
801 tc = GNUNET_new (struct TunnelContext);
802 spec = GNUNET_new (struct OperationSpecification);
803 spec->operation = set->operation;
804 spec->app_id = msg->app_id;
805 spec->salt = ntohl (msg->salt);
806 spec->peer = msg->target_peer;
808 spec->client_request_id = ntohl (msg->request_id);
809 spec->context_msg = GNUNET_MQ_extract_nested_mh (msg);
810 if (NULL != spec->context_msg)
811 spec->context_msg = GNUNET_copy_message (spec->context_msg);
813 tunnel = GNUNET_MESH_tunnel_create (mesh, tc, &msg->target_peer,
814 GNUNET_APPLICATION_TYPE_SET,
818 set->vt->evaluate (spec, tunnel, tc);
820 GNUNET_SERVER_receive_done (client, GNUNET_OK);
825 * Handle an ack from a client.
828 * @param client the client
829 * @param m the message
832 handle_client_iter_ack (void *cls,
833 struct GNUNET_SERVER_Client *client,
834 const struct GNUNET_MessageHeader *m)
838 set = set_get (client);
842 GNUNET_SERVER_client_disconnect (client);
846 if (NULL == set->iter)
849 GNUNET_SERVER_client_disconnect (client);
853 GNUNET_SERVER_receive_done (client, GNUNET_OK);
854 send_client_element (set);
859 * Handle a request from the client to accept
860 * a set operation that came from a remote peer.
863 * @param client the client
864 * @param mh the message
867 handle_client_cancel (void *cls,
868 struct GNUNET_SERVER_Client *client,
869 const struct GNUNET_MessageHeader *mh)
871 const struct GNUNET_SET_CancelMessage *msg =
872 (const struct GNUNET_SET_CancelMessage *) mh;
875 set = set_get (client);
879 GNUNET_SERVER_client_disconnect (client);
882 /* FIXME: maybe cancel should return success/error code? */
883 set->vt->cancel (set->state, ntohl (msg->request_id));
888 * Handle a request from the client to accept
889 * a set operation that came from a remote peer.
892 * @param client the client
893 * @param mh the message
896 handle_client_accept (void *cls,
897 struct GNUNET_SERVER_Client *client,
898 const struct GNUNET_MessageHeader *mh)
901 struct Incoming *incoming;
902 struct GNUNET_SET_AcceptRejectMessage *msg = (struct GNUNET_SET_AcceptRejectMessage *) mh;
904 incoming = get_incoming (ntohl (msg->accept_reject_id));
906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client accepting %u\n", ntohl (msg->accept_reject_id));
908 if (NULL == incoming)
911 GNUNET_SERVER_client_disconnect (client);
915 set = set_get (client);
920 GNUNET_SERVER_client_disconnect (client);
924 incoming->spec->set = set;
925 incoming->spec->client_request_id = ntohl (msg->request_id);
926 set->vt->accept (incoming->spec, incoming->tunnel, incoming->tc);
927 /* tunnel ownership goes to operation */
928 incoming->tunnel = NULL;
929 incoming_destroy (incoming);
930 GNUNET_SERVER_receive_done (client, GNUNET_OK);
935 * Called to clean up, after a shutdown has been requested.
938 * @param tc context information (why was this task triggered now)
941 shutdown_task (void *cls,
942 const struct GNUNET_SCHEDULER_TaskContext *tc)
944 while (NULL != incoming_head)
945 incoming_destroy (incoming_head);
947 while (NULL != listeners_head)
948 listener_destroy (listeners_head);
950 while (NULL != sets_head)
951 set_destroy (sets_head);
954 /* it's important to destroy mesh at the end, as tunnels
955 * must be destroyed first! */
958 GNUNET_MESH_disconnect (mesh);
962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled shutdown request\n");
967 * Signature of the main function of a task.
970 * @param tc context information (why was this task triggered now)
973 incoming_timeout_cb (void *cls,
974 const struct GNUNET_SCHEDULER_TaskContext *tc)
976 struct Incoming *incoming = cls;
978 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "remote peer timed out\n");
982 incoming_destroy (incoming);
987 handle_incoming_disconnect (struct OperationState *op_state)
989 struct Incoming *incoming = (struct Incoming *) op_state;
990 if (NULL == incoming->tunnel)
993 incoming_destroy (incoming);
998 * Method called whenever another peer has added us to a tunnel
999 * the other peer initiated.
1000 * Only called (once) upon reception of data with a message type which was
1001 * subscribed to in GNUNET_MESH_connect. A call to GNUNET_MESH_tunnel_destroy
1002 * causes te tunnel to be ignored and no further notifications are sent about
1005 * @param cls closure
1006 * @param tunnel new handle to the tunnel
1007 * @param initiator peer that started the tunnel
1008 * @param port Port this tunnel is for.
1009 * @return initial tunnel context for the tunnel
1010 * (can be NULL -- that's not an error)
1013 tunnel_new_cb (void *cls,
1014 struct GNUNET_MESH_Tunnel *tunnel,
1015 const struct GNUNET_PeerIdentity *initiator,
1018 struct Incoming *incoming;
1019 static const struct SetVT incoming_vt = {
1020 .msg_handler = handle_incoming_msg,
1021 .peer_disconnect = handle_incoming_disconnect
1024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new incoming tunnel\n");
1026 GNUNET_assert (port == GNUNET_APPLICATION_TYPE_SET);
1027 incoming = GNUNET_new (struct Incoming);
1028 incoming->peer = *initiator;
1029 incoming->tunnel = tunnel;
1030 incoming->tc = GNUNET_new (struct TunnelContext);;
1031 incoming->tc->vt = &incoming_vt;
1032 incoming->tc->op = (struct OperationState *) incoming;
1033 incoming->timeout_task =
1034 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, incoming_timeout_cb, incoming);
1035 GNUNET_CONTAINER_DLL_insert_tail (incoming_head, incoming_tail, incoming);
1037 return incoming->tc;
1042 * Function called whenever a tunnel is destroyed. Should clean up
1043 * any associated state.
1044 * GNUNET_MESH_tunnel_destroy. It must NOT call GNUNET_MESH_tunnel_destroy on
1047 * @param cls closure (set from GNUNET_MESH_connect)
1048 * @param tunnel connection to the other end (henceforth invalid)
1049 * @param tunnel_ctx place where local state associated
1050 * with the tunnel is stored
1053 tunnel_end_cb (void *cls,
1054 const struct GNUNET_MESH_Tunnel *tunnel, void *tunnel_ctx)
1056 struct TunnelContext *ctx = tunnel_ctx;
1058 ctx->vt->peer_disconnect (ctx->op);
1059 /* mesh will never call us with the context again! */
1060 GNUNET_free (tunnel_ctx);
1065 * Functions with this signature are called whenever a message is
1068 * Each time the function must call GNUNET_MESH_receive_done on the tunnel
1069 * in order to receive the next message. This doesn't need to be immediate:
1070 * can be delayed if some processing is done on the message.
1072 * @param cls Closure (set from GNUNET_MESH_connect).
1073 * @param tunnel Connection to the other end.
1074 * @param tunnel_ctx Place to store local state associated with the tunnel.
1075 * @param message The actual message.
1077 * @return GNUNET_OK to keep the tunnel open,
1078 * GNUNET_SYSERR to close it (signal serious error).
1081 dispatch_p2p_message (void *cls,
1082 struct GNUNET_MESH_Tunnel *tunnel,
1084 const struct GNUNET_MessageHeader *message)
1086 struct TunnelContext *tc = *tunnel_ctx;
1089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "dispatching mesh message (type: %u)\n",
1090 ntohs (message->type));
1091 /* do this before the handler, as the handler might kill the tunnel */
1092 GNUNET_MESH_receive_done (tunnel);
1093 ret = tc->vt->msg_handler (tc->op, message);
1094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled mesh message (type: %u)\n",
1095 ntohs (message->type));
1101 * Function called by the service's run
1102 * method to run service-specific setup code.
1104 * @param cls closure
1105 * @param server the initialized server
1106 * @param cfg configuration to use
1109 run (void *cls, struct GNUNET_SERVER_Handle *server,
1110 const struct GNUNET_CONFIGURATION_Handle *cfg)
1112 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1113 {handle_client_accept, NULL, GNUNET_MESSAGE_TYPE_SET_ACCEPT,
1114 sizeof (struct GNUNET_SET_AcceptRejectMessage)},
1115 {handle_client_iter_ack, NULL, GNUNET_MESSAGE_TYPE_SET_ITER_ACK, 0},
1116 {handle_client_add_remove, NULL, GNUNET_MESSAGE_TYPE_SET_ADD, 0},
1117 {handle_client_create, NULL, GNUNET_MESSAGE_TYPE_SET_CREATE,
1118 sizeof (struct GNUNET_SET_CreateMessage)},
1119 {handle_client_iterate, NULL, GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST,
1120 sizeof (struct GNUNET_MessageHeader)},
1121 {handle_client_evaluate, NULL, GNUNET_MESSAGE_TYPE_SET_EVALUATE, 0},
1122 {handle_client_listen, NULL, GNUNET_MESSAGE_TYPE_SET_LISTEN,
1123 sizeof (struct GNUNET_SET_ListenMessage)},
1124 {handle_client_reject, NULL, GNUNET_MESSAGE_TYPE_SET_REJECT,
1125 sizeof (struct GNUNET_SET_AcceptRejectMessage)},
1126 {handle_client_add_remove, NULL, GNUNET_MESSAGE_TYPE_SET_REMOVE, 0},
1127 {handle_client_cancel, NULL, GNUNET_MESSAGE_TYPE_SET_REMOVE,
1128 sizeof (struct GNUNET_SET_CancelMessage)},
1131 static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1132 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST, 0},
1133 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_IBF, 0},
1134 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS, 0},
1135 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_DONE, 0},
1136 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENT_REQUESTS, 0},
1137 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_SE, 0},
1140 static const uint32_t mesh_ports[] = {GNUNET_APPLICATION_TYPE_SET, 0};
1142 configuration = cfg;
1143 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1144 &shutdown_task, NULL);
1145 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1146 GNUNET_SERVER_add_handlers (server, server_handlers);
1148 mesh = GNUNET_MESH_connect (cfg, NULL, tunnel_new_cb, tunnel_end_cb,
1149 mesh_handlers, mesh_ports);
1152 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not connect to mesh\n");
1156 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "started\n");
1161 * The main function for the set service.
1163 * @param argc number of arguments from the command line
1164 * @param argv command line arguments
1165 * @return 0 ok, 1 on error
1168 main (int argc, char *const *argv)
1171 ret = GNUNET_SERVICE_run (argc, argv, "set",
1172 GNUNET_SERVICE_OPTION_NONE, &run, NULL);
1173 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit (%d)\n", GNUNET_OK != ret);
1174 return (GNUNET_OK == ret) ? 0 : 1;