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 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 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 (NULL != incoming->tunnel)
372 struct GNUNET_MESH_Tunnel *t = incoming->tunnel;
373 incoming->tunnel = NULL;
374 GNUNET_MESH_tunnel_destroy (t);
377 GNUNET_free (incoming);
381 static struct Listener *
382 listener_get_by_target (enum GNUNET_SET_OperationType op,
383 const struct GNUNET_HashCode *app_id)
387 for (l = listeners_head; NULL != l; l = l->next)
389 if (l->operation != op)
391 if (0 != GNUNET_CRYPTO_hash_cmp (app_id, &l->app_id))
400 * Suggest the given request to the listener,
401 * who can accept or reject the request.
403 * @param incoming the incoming peer with the request to suggest
404 * @param listener the listener to suggest the request to
407 incoming_suggest (struct Incoming *incoming, struct Listener *listener)
409 struct GNUNET_MQ_Envelope *mqm;
410 struct GNUNET_SET_RequestMessage *cmsg;
412 GNUNET_assert (0 == incoming->suggest_id);
413 GNUNET_assert (NULL != incoming->spec);
414 incoming->suggest_id = suggest_id++;
416 GNUNET_SCHEDULER_cancel (incoming->timeout_task);
417 mqm = GNUNET_MQ_msg_nested_mh (cmsg, GNUNET_MESSAGE_TYPE_SET_REQUEST,
418 incoming->spec->context_msg);
419 GNUNET_assert (NULL != mqm);
420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "suggesting request with accept id %u\n",
421 incoming->suggest_id);
422 cmsg->accept_id = htonl (incoming->suggest_id);
423 cmsg->peer_id = incoming->spec->peer;
424 GNUNET_MQ_send (listener->client_mq, mqm);
430 * Handle a request for a set operation from
433 * @param op the operation state
434 * @param mh the received message
435 * @return GNUNET_OK if the tunnel should be kept alive,
436 * GNUNET_SYSERR to destroy the tunnel
439 handle_incoming_msg (struct OperationState *op,
440 const struct GNUNET_MessageHeader *mh)
442 struct Incoming *incoming = (struct Incoming *) op;
443 const struct OperationRequestMessage *msg = (const struct OperationRequestMessage *) mh;
444 struct Listener *listener;
445 struct OperationSpecification *spec;
447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got op request\n");
449 if (GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST != ntohs (mh->type))
452 return GNUNET_SYSERR;
455 if (NULL != incoming->spec)
457 /* double operation request */
459 return GNUNET_SYSERR;
462 spec = GNUNET_new (struct OperationSpecification);
463 spec->context_msg = GNUNET_MQ_extract_nested_mh (msg);
464 if (NULL != spec->context_msg)
465 spec->context_msg = GNUNET_copy_message (spec->context_msg);
466 spec->operation = ntohl (msg->operation);
467 spec->app_id = msg->app_id;
468 spec->salt = ntohl (msg->salt);
469 spec->peer = incoming->peer;
471 incoming->spec = spec;
473 if ( (NULL != spec->context_msg) &&
474 (ntohs (spec->context_msg->size) > GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE) )
477 return GNUNET_SYSERR;
480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "received P2P operation request (op %u, app %s)\n",
481 ntohl (msg->operation), GNUNET_h2s (&msg->app_id));
482 listener = listener_get_by_target (ntohl (msg->operation), &msg->app_id);
483 if (NULL == listener)
485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
486 "no listener matches incoming request, waiting with timeout\n");
489 incoming_suggest (incoming, listener);
495 send_client_element (struct Set *set)
498 struct ElementEntry *ee;
499 struct GNUNET_MQ_Envelope *ev;
501 GNUNET_assert (NULL != set->iter);
502 ret = GNUNET_CONTAINER_multihashmap_iterator_next (set->iter, NULL, (const void **) &ee);
503 if (GNUNET_NO == ret)
505 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_DONE);
509 struct GNUNET_SET_IterResponseMessage *msg;
511 GNUNET_assert (NULL != ee);
512 ev = GNUNET_MQ_msg_extra (msg, ee->element.size, GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT);
513 memcpy (&msg[1], ee->element.data, ee->element.size);
514 msg->element_type = ee->element.type;
516 GNUNET_MQ_send (set->client_mq, ev);
521 * Called when a client wants to iterate the elements of a set.
524 * @param client client that sent the message
525 * @param m message sent by the client
528 handle_client_iterate (void *cls,
529 struct GNUNET_SERVER_Client *client,
530 const struct GNUNET_MessageHeader *m)
534 set = set_get (client);
538 GNUNET_SERVER_client_disconnect (client);
542 if (NULL != set->iter)
545 GNUNET_SERVER_client_disconnect (client);
548 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "iterating union set with %u elements\n",
549 GNUNET_CONTAINER_multihashmap_size (set->elements));
550 GNUNET_SERVER_receive_done (client, GNUNET_OK);
551 set->iter = GNUNET_CONTAINER_multihashmap_iterator_create (set->elements);
552 send_client_element (set);
557 * Called when a client wants to create a new set.
560 * @param client client that sent the message
561 * @param m message sent by the client
564 handle_client_create (void *cls,
565 struct GNUNET_SERVER_Client *client,
566 const struct GNUNET_MessageHeader *m)
568 struct GNUNET_SET_CreateMessage *msg = (struct GNUNET_SET_CreateMessage *) m;
571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client created new set (operation %u)\n",
572 ntohs (msg->operation));
574 if (NULL != set_get (client))
577 GNUNET_SERVER_client_disconnect (client);
581 set = GNUNET_new (struct Set);
583 switch (ntohs (msg->operation))
585 case GNUNET_SET_OPERATION_INTERSECTION:
588 case GNUNET_SET_OPERATION_UNION:
589 set->vt = _GSS_union_vt ();
594 GNUNET_SERVER_client_disconnect (client);
598 set->state = set->vt->create ();
599 set->elements = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
600 set->client = client;
601 set->client_mq = GNUNET_MQ_queue_for_server_client (client);
602 GNUNET_CONTAINER_DLL_insert (sets_head, sets_tail, set);
603 GNUNET_SERVER_receive_done (client, GNUNET_OK);
608 * Called when a client wants to create a new listener.
611 * @param client client that sent the message
612 * @param m message sent by the client
615 handle_client_listen (void *cls,
616 struct GNUNET_SERVER_Client *client,
617 const struct GNUNET_MessageHeader *m)
619 struct GNUNET_SET_ListenMessage *msg = (struct GNUNET_SET_ListenMessage *) m;
620 struct Listener *listener;
621 struct Incoming *incoming;
623 if (NULL != listener_get (client))
626 GNUNET_SERVER_client_disconnect (client);
629 listener = GNUNET_new (struct Listener);
630 listener->client = client;
631 listener->client_mq = GNUNET_MQ_queue_for_server_client (client);
632 listener->app_id = msg->app_id;
633 listener->operation = ntohl (msg->operation);
634 GNUNET_CONTAINER_DLL_insert_tail (listeners_head, listeners_tail, listener);
635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new listener created (op %u, app %s)\n",
636 listener->operation, GNUNET_h2s (&listener->app_id));
637 for (incoming = incoming_head; NULL != incoming; incoming = incoming->next)
639 if (NULL == incoming->spec)
641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "request has no spec yet\n");
644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "considering (op: %u, app: %s, suggest: %u)\n",
645 incoming->spec->operation, GNUNET_h2s (&incoming->spec->app_id), incoming->suggest_id);
647 if (0 != incoming->suggest_id)
649 if (listener->operation != incoming->spec->operation)
651 if (0 != GNUNET_CRYPTO_hash_cmp (&listener->app_id, &incoming->spec->app_id))
653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "request suggested\n");
654 incoming_suggest (incoming, listener);
656 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "considered all incoming requests\n");
657 GNUNET_SERVER_receive_done (client, GNUNET_OK);
662 * Called when the client wants to reject an operation
663 * request from another peer.
666 * @param client client that sent the message
667 * @param m message sent by the client
670 handle_client_reject (void *cls,
671 struct GNUNET_SERVER_Client *client,
672 const struct GNUNET_MessageHeader *m)
674 struct Incoming *incoming;
675 const struct GNUNET_SET_AcceptRejectMessage *msg;
677 msg = (const struct GNUNET_SET_AcceptRejectMessage *) m;
678 GNUNET_break (0 == ntohl (msg->request_id));
680 incoming = get_incoming (ntohl (msg->accept_reject_id));
681 if (NULL == incoming)
683 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer request rejected by client\n");
687 GNUNET_MESH_tunnel_destroy (incoming->tunnel);
688 GNUNET_SERVER_receive_done (client, GNUNET_OK);
693 * Called when a client wants to add an element to a
697 * @param client client that sent the message
698 * @param m message sent by the client
701 handle_client_add_remove (void *cls,
702 struct GNUNET_SERVER_Client *client,
703 const struct GNUNET_MessageHeader *m)
706 const struct GNUNET_SET_ElementMessage *msg;
707 struct GNUNET_SET_Element el;
708 struct ElementEntry *ee;
710 set = set_get (client);
714 GNUNET_SERVER_client_disconnect (client);
717 GNUNET_SERVER_receive_done (client, GNUNET_OK);
718 msg = (const struct GNUNET_SET_ElementMessage *) m;
719 el.size = ntohs (m->size) - sizeof *msg;
720 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
721 "client ins/rem element of size %u\n", el.size);
723 if (GNUNET_MESSAGE_TYPE_SET_REMOVE == ntohs (m->type))
725 struct GNUNET_HashCode hash;
727 GNUNET_CRYPTO_hash (el.data, el.size, &hash);
728 ee = GNUNET_CONTAINER_multihashmap_get (set->elements, &hash);
731 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to remove non-existing element\n");
734 if (GNUNET_YES == ee->removed)
736 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to remove element twice\n");
739 ee->removed = GNUNET_YES;
740 ee->generation_removed = set->current_generation;
741 set->vt->remove (set->state, ee);
745 struct ElementEntry *ee_dup;
747 ee = GNUNET_malloc (el.size + sizeof *ee);
748 ee->element.size = el.size;
749 memcpy (&ee[1], el.data, el.size);
750 ee->element.data = &ee[1];
751 ee->generation_added = set->current_generation;
752 ee->remote = GNUNET_NO;
753 GNUNET_CRYPTO_hash (ee->element.data, el.size, &ee->element_hash);
754 ee_dup = GNUNET_CONTAINER_multihashmap_get (set->elements,
758 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "element inserted twice, ignoring\n");
762 GNUNET_CONTAINER_multihashmap_put (set->elements, &ee->element_hash, ee,
763 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
764 set->vt->add (set->state, ee);
770 * Called when a client wants to evaluate a set operation with another peer.
773 * @param client client that sent the message
774 * @param m message sent by the client
777 handle_client_evaluate (void *cls,
778 struct GNUNET_SERVER_Client *client,
779 const struct GNUNET_MessageHeader *m)
782 struct TunnelContext *tc;
783 struct GNUNET_MESH_Tunnel *tunnel;
784 struct GNUNET_SET_EvaluateMessage *msg;
785 struct OperationSpecification *spec;
787 set = set_get (client);
791 GNUNET_SERVER_client_disconnect (client);
795 msg = (struct GNUNET_SET_EvaluateMessage *) m;
796 tc = GNUNET_new (struct TunnelContext);
797 spec = GNUNET_new (struct OperationSpecification);
798 spec->operation = set->operation;
799 spec->app_id = msg->app_id;
800 spec->salt = ntohl (msg->salt);
801 spec->peer = msg->target_peer;
803 spec->client_request_id = ntohl (msg->request_id);
804 spec->context_msg = GNUNET_MQ_extract_nested_mh (msg);
805 if (NULL != spec->context_msg)
806 spec->context_msg = GNUNET_copy_message (spec->context_msg);
808 tunnel = GNUNET_MESH_tunnel_create (mesh, tc, &msg->target_peer,
809 GNUNET_APPLICATION_TYPE_SET,
813 set->vt->evaluate (spec, tunnel, tc);
815 GNUNET_SERVER_receive_done (client, GNUNET_OK);
820 * Handle an ack from a client.
823 * @param client the client
824 * @param m the message
827 handle_client_iter_ack (void *cls,
828 struct GNUNET_SERVER_Client *client,
829 const struct GNUNET_MessageHeader *m)
833 set = set_get (client);
837 GNUNET_SERVER_client_disconnect (client);
841 if (NULL == set->iter)
844 GNUNET_SERVER_client_disconnect (client);
848 GNUNET_SERVER_receive_done (client, GNUNET_OK);
849 send_client_element (set);
854 * Handle a request from the client to accept
855 * a set operation that came from a remote peer.
858 * @param client the client
859 * @param mh the message
862 handle_client_cancel (void *cls,
863 struct GNUNET_SERVER_Client *client,
864 const struct GNUNET_MessageHeader *mh)
866 const struct GNUNET_SET_CancelMessage *msg =
867 (const struct GNUNET_SET_CancelMessage *) mh;
870 set = set_get (client);
874 GNUNET_SERVER_client_disconnect (client);
877 /* FIXME: maybe cancel should return success/error code? */
878 set->vt->cancel (set->state, ntohl (msg->request_id));
883 * Handle a request from the client to accept
884 * a set operation that came from a remote peer.
887 * @param client the client
888 * @param mh the message
891 handle_client_accept (void *cls,
892 struct GNUNET_SERVER_Client *client,
893 const struct GNUNET_MessageHeader *mh)
896 struct Incoming *incoming;
897 struct GNUNET_SET_AcceptRejectMessage *msg = (struct GNUNET_SET_AcceptRejectMessage *) mh;
899 incoming = get_incoming (ntohl (msg->accept_reject_id));
901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client accepting %u\n", ntohl (msg->accept_reject_id));
903 if (NULL == incoming)
907 GNUNET_SERVER_client_disconnect (client);
911 set = set_get (client);
916 GNUNET_SERVER_client_disconnect (client);
920 incoming->spec->set = set;
921 incoming->spec->client_request_id = ntohl (msg->request_id);
922 set->vt->accept (incoming->spec, incoming->tunnel, incoming->tc);
923 /* tunnel ownership goes to operation */
924 incoming->tunnel = NULL;
925 incoming_destroy (incoming);
926 GNUNET_SERVER_receive_done (client, GNUNET_OK);
931 * Called to clean up, after a shutdown has been requested.
934 * @param tc context information (why was this task triggered now)
937 shutdown_task (void *cls,
938 const struct GNUNET_SCHEDULER_TaskContext *tc)
940 while (NULL != incoming_head)
941 incoming_destroy (incoming_head);
943 while (NULL != listeners_head)
944 listener_destroy (listeners_head);
946 while (NULL != sets_head)
947 set_destroy (sets_head);
950 /* it's important to destroy mesh at the end, as tunnels
951 * must be destroyed first! */
954 GNUNET_MESH_disconnect (mesh);
958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled shutdown request\n");
963 * Signature of the main function of a task.
966 * @param tc context information (why was this task triggered now)
969 incoming_timeout_cb (void *cls,
970 const struct GNUNET_SCHEDULER_TaskContext *tc)
972 struct Incoming *incoming = cls;
974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "remote peer timed out\n");
975 incoming_destroy (incoming);
980 handle_incoming_disconnect (struct OperationState *op_state)
982 struct Incoming *incoming = (struct Incoming *) op_state;
983 if (NULL == incoming->tunnel)
986 incoming_destroy (incoming);
991 * Method called whenever another peer has added us to a tunnel
992 * the other peer initiated.
993 * Only called (once) upon reception of data with a message type which was
994 * subscribed to in GNUNET_MESH_connect. A call to GNUNET_MESH_tunnel_destroy
995 * causes te tunnel to be ignored and no further notifications are sent about
999 * @param tunnel new handle to the tunnel
1000 * @param initiator peer that started the tunnel
1001 * @param port Port this tunnel is for.
1002 * @return initial tunnel context for the tunnel
1003 * (can be NULL -- that's not an error)
1006 tunnel_new_cb (void *cls,
1007 struct GNUNET_MESH_Tunnel *tunnel,
1008 const struct GNUNET_PeerIdentity *initiator,
1011 struct Incoming *incoming;
1012 static const struct SetVT incoming_vt = {
1013 .msg_handler = handle_incoming_msg,
1014 .peer_disconnect = handle_incoming_disconnect
1017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new incoming tunnel\n");
1019 GNUNET_assert (port == GNUNET_APPLICATION_TYPE_SET);
1020 incoming = GNUNET_new (struct Incoming);
1021 incoming->peer = *initiator;
1022 incoming->tunnel = tunnel;
1023 incoming->tc = GNUNET_new (struct TunnelContext);;
1024 incoming->tc->vt = &incoming_vt;
1025 incoming->tc->op = (struct OperationState *) incoming;
1026 incoming->timeout_task =
1027 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, incoming_timeout_cb, incoming);
1028 GNUNET_CONTAINER_DLL_insert_tail (incoming_head, incoming_tail, incoming);
1030 return incoming->tc;
1035 * Function called whenever a tunnel is destroyed. Should clean up
1036 * any associated state.
1037 * GNUNET_MESH_tunnel_destroy. It must NOT call GNUNET_MESH_tunnel_destroy on
1040 * @param cls closure (set from GNUNET_MESH_connect)
1041 * @param tunnel connection to the other end (henceforth invalid)
1042 * @param tunnel_ctx place where local state associated
1043 * with the tunnel is stored
1046 tunnel_end_cb (void *cls,
1047 const struct GNUNET_MESH_Tunnel *tunnel, void *tunnel_ctx)
1049 struct TunnelContext *ctx = tunnel_ctx;
1051 ctx->vt->peer_disconnect (ctx->op);
1052 /* mesh will never call us with the context again! */
1053 GNUNET_free (tunnel_ctx);
1058 * Functions with this signature are called whenever a message is
1061 * Each time the function must call GNUNET_MESH_receive_done on the tunnel
1062 * in order to receive the next message. This doesn't need to be immediate:
1063 * can be delayed if some processing is done on the message.
1065 * @param cls Closure (set from GNUNET_MESH_connect).
1066 * @param tunnel Connection to the other end.
1067 * @param tunnel_ctx Place to store local state associated with the tunnel.
1068 * @param message The actual message.
1070 * @return GNUNET_OK to keep the tunnel open,
1071 * GNUNET_SYSERR to close it (signal serious error).
1074 dispatch_p2p_message (void *cls,
1075 struct GNUNET_MESH_Tunnel *tunnel,
1077 const struct GNUNET_MessageHeader *message)
1079 struct TunnelContext *tc = *tunnel_ctx;
1082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "dispatching mesh message (type: %u)\n",
1083 ntohs (message->type));
1084 /* do this before the handler, as the handler might kill the tunnel */
1085 GNUNET_MESH_receive_done (tunnel);
1086 ret = tc->vt->msg_handler (tc->op, message);
1087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled mesh message (type: %u)\n",
1088 ntohs (message->type));
1094 * Function called by the service's run
1095 * method to run service-specific setup code.
1097 * @param cls closure
1098 * @param server the initialized server
1099 * @param cfg configuration to use
1102 run (void *cls, struct GNUNET_SERVER_Handle *server,
1103 const struct GNUNET_CONFIGURATION_Handle *cfg)
1105 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1106 {handle_client_accept, NULL, GNUNET_MESSAGE_TYPE_SET_ACCEPT,
1107 sizeof (struct GNUNET_SET_AcceptRejectMessage)},
1108 {handle_client_iter_ack, NULL, GNUNET_MESSAGE_TYPE_SET_ITER_ACK, 0},
1109 {handle_client_add_remove, NULL, GNUNET_MESSAGE_TYPE_SET_ADD, 0},
1110 {handle_client_create, NULL, GNUNET_MESSAGE_TYPE_SET_CREATE,
1111 sizeof (struct GNUNET_SET_CreateMessage)},
1112 {handle_client_iterate, NULL, GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST,
1113 sizeof (struct GNUNET_MessageHeader)},
1114 {handle_client_evaluate, NULL, GNUNET_MESSAGE_TYPE_SET_EVALUATE, 0},
1115 {handle_client_listen, NULL, GNUNET_MESSAGE_TYPE_SET_LISTEN,
1116 sizeof (struct GNUNET_SET_ListenMessage)},
1117 {handle_client_reject, NULL, GNUNET_MESSAGE_TYPE_SET_REJECT,
1118 sizeof (struct GNUNET_SET_AcceptRejectMessage)},
1119 {handle_client_add_remove, NULL, GNUNET_MESSAGE_TYPE_SET_REMOVE, 0},
1120 {handle_client_cancel, NULL, GNUNET_MESSAGE_TYPE_SET_REMOVE,
1121 sizeof (struct GNUNET_SET_CancelMessage)},
1124 static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1125 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST, 0},
1126 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_IBF, 0},
1127 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS, 0},
1128 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_DONE, 0},
1129 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_DIE, 0},
1130 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENT_REQUESTS, 0},
1131 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_SE, 0},
1134 static const uint32_t mesh_ports[] = {GNUNET_APPLICATION_TYPE_SET, 0};
1136 configuration = cfg;
1137 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1138 &shutdown_task, NULL);
1139 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1140 GNUNET_SERVER_add_handlers (server, server_handlers);
1142 mesh = GNUNET_MESH_connect (cfg, NULL, tunnel_new_cb, tunnel_end_cb,
1143 mesh_handlers, mesh_ports);
1146 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not connect to mesh\n");
1150 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "started\n");
1155 * The main function for the set service.
1157 * @param argc number of arguments from the command line
1158 * @param argv command line arguments
1159 * @return 0 ok, 1 on error
1162 main (int argc, char *const *argv)
1165 ret = GNUNET_SERVICE_run (argc, argv, "set",
1166 GNUNET_SERVICE_OPTION_NONE, &run, NULL);
1167 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit (%d)\n", GNUNET_OK != ret);
1168 return (GNUNET_OK == ret) ? 0 : 1;