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 if (NULL != set->client)
297 struct GNUNET_SERVER_Client *client = set->client;
299 GNUNET_SERVER_client_disconnect (client);
302 if (NULL != set->client_mq)
304 GNUNET_MQ_destroy (set->client_mq);
305 set->client_mq = NULL;
307 if (NULL != set->elements)
309 GNUNET_CONTAINER_multihashmap_iterate (set->elements,
310 destroy_elements_iterator, NULL);
311 GNUNET_CONTAINER_multihashmap_destroy (set->elements);
312 set->elements = NULL;
314 if (NULL != set->iter)
316 GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
319 GNUNET_assert (NULL != set->state);
320 set->vt->destroy_set (set->state);
322 GNUNET_CONTAINER_DLL_remove (sets_head, sets_tail, set);
328 * Clean up after a client after it is
329 * disconnected (either by us or by itself)
331 * @param cls closure, unused
332 * @param client the client to clean up after
335 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
338 struct Listener *listener;
340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected, cleaning up\n");
342 set = set_get (client);
347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "(client's set destroyed)\n");
349 listener = listener_get (client);
350 if (NULL != listener)
352 listener->client = NULL;
353 listener_destroy (listener);
354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "(client's listener destroyed)\n");
360 * Destroy an incoming request from a remote peer
362 * @param incoming remote request to destroy
365 incoming_destroy (struct Incoming *incoming)
367 GNUNET_CONTAINER_DLL_remove (incoming_head, incoming_tail, incoming);
368 if (NULL != incoming->tunnel)
370 struct GNUNET_MESH_Tunnel *t = incoming->tunnel;
371 incoming->tunnel = NULL;
372 GNUNET_MESH_tunnel_destroy (t);
375 GNUNET_free (incoming);
379 static struct Listener *
380 listener_get_by_target (enum GNUNET_SET_OperationType op,
381 const struct GNUNET_HashCode *app_id)
385 for (l = listeners_head; NULL != l; l = l->next)
387 if (l->operation != op)
389 if (0 != GNUNET_CRYPTO_hash_cmp (app_id, &l->app_id))
398 * Suggest the given request to the listener,
399 * who can accept or reject the request.
401 * @param incoming the incoming peer with the request to suggest
402 * @param listener the listener to suggest the request to
405 incoming_suggest (struct Incoming *incoming, struct Listener *listener)
407 struct GNUNET_MQ_Envelope *mqm;
408 struct GNUNET_SET_RequestMessage *cmsg;
410 GNUNET_assert (0 == incoming->suggest_id);
411 GNUNET_assert (NULL != incoming->spec);
412 incoming->suggest_id = suggest_id++;
414 GNUNET_SCHEDULER_cancel (incoming->timeout_task);
415 mqm = GNUNET_MQ_msg_nested_mh (cmsg, GNUNET_MESSAGE_TYPE_SET_REQUEST,
416 incoming->spec->context_msg);
417 GNUNET_assert (NULL != mqm);
418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "suggesting request with accept id %u\n",
419 incoming->suggest_id);
420 cmsg->accept_id = htonl (incoming->suggest_id);
421 cmsg->peer_id = incoming->spec->peer;
422 GNUNET_MQ_send (listener->client_mq, mqm);
428 * Handle a request for a set operation from
431 * @param op the operation state
432 * @param mh the received message
433 * @return GNUNET_OK if the tunnel should be kept alive,
434 * GNUNET_SYSERR to destroy the tunnel
437 handle_incoming_msg (struct OperationState *op,
438 const struct GNUNET_MessageHeader *mh)
440 struct Incoming *incoming = (struct Incoming *) op;
441 const struct OperationRequestMessage *msg = (const struct OperationRequestMessage *) mh;
442 struct Listener *listener;
443 struct OperationSpecification *spec;
445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got op request\n");
447 if (GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST != ntohs (mh->type))
450 return GNUNET_SYSERR;
453 if (NULL != incoming->spec)
455 /* double operation request */
457 return GNUNET_SYSERR;
460 spec = GNUNET_new (struct OperationSpecification);
461 spec->context_msg = GNUNET_MQ_extract_nested_mh (msg);
462 if (NULL != spec->context_msg)
463 spec->context_msg = GNUNET_copy_message (spec->context_msg);
464 spec->operation = ntohl (msg->operation);
465 spec->app_id = msg->app_id;
466 spec->salt = ntohl (msg->salt);
467 spec->peer = incoming->peer;
469 incoming->spec = spec;
471 if ( (NULL != spec->context_msg) &&
472 (ntohs (spec->context_msg->size) > GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE) )
475 return GNUNET_SYSERR;
478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "received P2P operation request (op %u, app %s)\n",
479 ntohl (msg->operation), GNUNET_h2s (&msg->app_id));
480 listener = listener_get_by_target (ntohl (msg->operation), &msg->app_id);
481 if (NULL == listener)
483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
484 "no listener matches incoming request, waiting with timeout\n");
487 incoming_suggest (incoming, listener);
493 send_client_element (struct Set *set)
496 struct ElementEntry *ee;
497 struct GNUNET_MQ_Envelope *ev;
499 GNUNET_assert (NULL != set->iter);
500 ret = GNUNET_CONTAINER_multihashmap_iterator_next (set->iter, NULL, (const void **) &ee);
501 if (GNUNET_NO == ret)
503 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_DONE);
507 struct GNUNET_SET_IterResponseMessage *msg;
509 GNUNET_assert (NULL != ee);
510 ev = GNUNET_MQ_msg_extra (msg, ee->element.size, GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT);
511 memcpy (&msg[1], ee->element.data, ee->element.size);
512 msg->element_type = ee->element.type;
514 GNUNET_MQ_send (set->client_mq, ev);
519 * Called when a client wants to iterate the elements of a set.
522 * @param client client that sent the message
523 * @param m message sent by the client
526 handle_client_iterate (void *cls,
527 struct GNUNET_SERVER_Client *client,
528 const struct GNUNET_MessageHeader *m)
532 set = set_get (client);
536 GNUNET_SERVER_client_disconnect (client);
540 if (NULL != set->iter)
543 GNUNET_SERVER_client_disconnect (client);
546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "iterating union set with %u elements\n",
547 GNUNET_CONTAINER_multihashmap_size (set->elements));
548 GNUNET_SERVER_receive_done (client, GNUNET_OK);
549 set->iter = GNUNET_CONTAINER_multihashmap_iterator_create (set->elements);
550 send_client_element (set);
555 * Called when a client wants to create a new set.
558 * @param client client that sent the message
559 * @param m message sent by the client
562 handle_client_create (void *cls,
563 struct GNUNET_SERVER_Client *client,
564 const struct GNUNET_MessageHeader *m)
566 struct GNUNET_SET_CreateMessage *msg = (struct GNUNET_SET_CreateMessage *) m;
569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client created new set (operation %u)\n",
570 ntohs (msg->operation));
572 if (NULL != set_get (client))
575 GNUNET_SERVER_client_disconnect (client);
579 set = GNUNET_new (struct Set);
581 switch (ntohs (msg->operation))
583 case GNUNET_SET_OPERATION_INTERSECTION:
586 case GNUNET_SET_OPERATION_UNION:
587 set->vt = _GSS_union_vt ();
592 GNUNET_SERVER_client_disconnect (client);
596 set->state = set->vt->create ();
597 set->elements = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
598 set->client = client;
599 set->client_mq = GNUNET_MQ_queue_for_server_client (client);
600 GNUNET_CONTAINER_DLL_insert (sets_head, sets_tail, set);
601 GNUNET_SERVER_receive_done (client, GNUNET_OK);
606 * Called when a client wants to create a new listener.
609 * @param client client that sent the message
610 * @param m message sent by the client
613 handle_client_listen (void *cls,
614 struct GNUNET_SERVER_Client *client,
615 const struct GNUNET_MessageHeader *m)
617 struct GNUNET_SET_ListenMessage *msg = (struct GNUNET_SET_ListenMessage *) m;
618 struct Listener *listener;
619 struct Incoming *incoming;
621 if (NULL != listener_get (client))
624 GNUNET_SERVER_client_disconnect (client);
627 listener = GNUNET_new (struct Listener);
628 listener->client = client;
629 listener->client_mq = GNUNET_MQ_queue_for_server_client (client);
630 listener->app_id = msg->app_id;
631 listener->operation = ntohl (msg->operation);
632 GNUNET_CONTAINER_DLL_insert_tail (listeners_head, listeners_tail, listener);
633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new listener created (op %u, app %s)\n",
634 listener->operation, GNUNET_h2s (&listener->app_id));
635 for (incoming = incoming_head; NULL != incoming; incoming = incoming->next)
637 if (NULL == incoming->spec)
639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "request has no spec yet\n");
642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "considering (op: %u, app: %s, suggest: %u)\n",
643 incoming->spec->operation, GNUNET_h2s (&incoming->spec->app_id), incoming->suggest_id);
645 if (0 != incoming->suggest_id)
647 if (listener->operation != incoming->spec->operation)
649 if (0 != GNUNET_CRYPTO_hash_cmp (&listener->app_id, &incoming->spec->app_id))
651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "request suggested\n");
652 incoming_suggest (incoming, listener);
654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "considered all incoming requests\n");
655 GNUNET_SERVER_receive_done (client, GNUNET_OK);
660 * Called when the client wants to reject an operation
661 * request from another peer.
664 * @param client client that sent the message
665 * @param m message sent by the client
668 handle_client_reject (void *cls,
669 struct GNUNET_SERVER_Client *client,
670 const struct GNUNET_MessageHeader *m)
672 struct Incoming *incoming;
673 const struct GNUNET_SET_AcceptRejectMessage *msg;
675 msg = (const struct GNUNET_SET_AcceptRejectMessage *) m;
676 GNUNET_break (0 == ntohl (msg->request_id));
678 incoming = get_incoming (ntohl (msg->accept_reject_id));
679 if (NULL == incoming)
681 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer request rejected by client\n");
685 GNUNET_MESH_tunnel_destroy (incoming->tunnel);
686 GNUNET_SERVER_receive_done (client, GNUNET_OK);
691 * Called when a client wants to add an element to a
695 * @param client client that sent the message
696 * @param m message sent by the client
699 handle_client_add_remove (void *cls,
700 struct GNUNET_SERVER_Client *client,
701 const struct GNUNET_MessageHeader *m)
704 const struct GNUNET_SET_ElementMessage *msg;
705 struct GNUNET_SET_Element el;
706 struct ElementEntry *ee;
708 set = set_get (client);
712 GNUNET_SERVER_client_disconnect (client);
715 GNUNET_SERVER_receive_done (client, GNUNET_OK);
716 msg = (const struct GNUNET_SET_ElementMessage *) m;
717 el.size = ntohs (m->size) - sizeof *msg;
718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
719 "client ins/rem element of size %u\n", el.size);
721 if (GNUNET_MESSAGE_TYPE_SET_REMOVE == ntohs (m->type))
723 struct GNUNET_HashCode hash;
725 GNUNET_CRYPTO_hash (el.data, el.size, &hash);
726 ee = GNUNET_CONTAINER_multihashmap_get (set->elements, &hash);
729 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to remove non-existing element\n");
732 if (GNUNET_YES == ee->removed)
734 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to remove element twice\n");
737 ee->removed = GNUNET_YES;
738 ee->generation_removed = set->current_generation;
739 set->vt->remove (set->state, ee);
743 struct ElementEntry *ee_dup;
745 ee = GNUNET_malloc (el.size + sizeof *ee);
746 ee->element.size = el.size;
747 memcpy (&ee[1], el.data, el.size);
748 ee->element.data = &ee[1];
749 ee->generation_added = set->current_generation;
750 ee->remote = GNUNET_NO;
751 GNUNET_CRYPTO_hash (ee->element.data, el.size, &ee->element_hash);
752 ee_dup = GNUNET_CONTAINER_multihashmap_get (set->elements,
756 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "element inserted twice, ignoring\n");
760 GNUNET_CONTAINER_multihashmap_put (set->elements, &ee->element_hash, ee,
761 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
762 set->vt->add (set->state, ee);
768 * Called when a client wants to evaluate a set operation with another peer.
771 * @param client client that sent the message
772 * @param m message sent by the client
775 handle_client_evaluate (void *cls,
776 struct GNUNET_SERVER_Client *client,
777 const struct GNUNET_MessageHeader *m)
780 struct TunnelContext *tc;
781 struct GNUNET_MESH_Tunnel *tunnel;
782 struct GNUNET_SET_EvaluateMessage *msg;
783 struct OperationSpecification *spec;
785 set = set_get (client);
789 GNUNET_SERVER_client_disconnect (client);
793 msg = (struct GNUNET_SET_EvaluateMessage *) m;
794 tc = GNUNET_new (struct TunnelContext);
795 spec = GNUNET_new (struct OperationSpecification);
796 spec->operation = set->operation;
797 spec->app_id = msg->app_id;
798 spec->salt = ntohl (msg->salt);
799 spec->peer = msg->target_peer;
801 spec->client_request_id = ntohl (msg->request_id);
802 spec->context_msg = GNUNET_MQ_extract_nested_mh (msg);
803 if (NULL != spec->context_msg)
804 spec->context_msg = GNUNET_copy_message (spec->context_msg);
806 tunnel = GNUNET_MESH_tunnel_create (mesh, tc, &msg->target_peer,
807 GNUNET_APPLICATION_TYPE_SET,
811 set->vt->evaluate (spec, tunnel, tc);
813 GNUNET_SERVER_receive_done (client, GNUNET_OK);
818 * Handle an ack from a client.
821 * @param client the client
822 * @param m the message
825 handle_client_iter_ack (void *cls,
826 struct GNUNET_SERVER_Client *client,
827 const struct GNUNET_MessageHeader *m)
831 set = set_get (client);
835 GNUNET_SERVER_client_disconnect (client);
839 if (NULL == set->iter)
842 GNUNET_SERVER_client_disconnect (client);
846 GNUNET_SERVER_receive_done (client, GNUNET_OK);
847 send_client_element (set);
852 * Handle a request from the client to accept
853 * a set operation that came from a remote peer.
856 * @param client the client
857 * @param mh the message
860 handle_client_cancel (void *cls,
861 struct GNUNET_SERVER_Client *client,
862 const struct GNUNET_MessageHeader *mh)
864 const struct GNUNET_SET_CancelMessage *msg =
865 (const struct GNUNET_SET_CancelMessage *) mh;
868 set = set_get (client);
872 GNUNET_SERVER_client_disconnect (client);
875 /* FIXME: maybe cancel should return success/error code? */
876 set->vt->cancel (set->state, ntohl (msg->request_id));
881 * Handle a request from the client to accept
882 * a set operation that came from a remote peer.
885 * @param client the client
886 * @param mh the message
889 handle_client_accept (void *cls,
890 struct GNUNET_SERVER_Client *client,
891 const struct GNUNET_MessageHeader *mh)
894 struct Incoming *incoming;
895 struct GNUNET_SET_AcceptRejectMessage *msg = (struct GNUNET_SET_AcceptRejectMessage *) mh;
897 incoming = get_incoming (ntohl (msg->accept_reject_id));
899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client accepting %u\n", ntohl (msg->accept_reject_id));
901 if (NULL == incoming)
905 GNUNET_SERVER_client_disconnect (client);
909 set = set_get (client);
914 GNUNET_SERVER_client_disconnect (client);
918 incoming->spec->set = set;
919 incoming->spec->client_request_id = ntohl (msg->request_id);
920 set->vt->accept (incoming->spec, incoming->tunnel, incoming->tc);
921 /* tunnel ownership goes to operation */
922 incoming->tunnel = NULL;
923 incoming_destroy (incoming);
924 GNUNET_SERVER_receive_done (client, GNUNET_OK);
929 * Called to clean up, after a shutdown has been requested.
932 * @param tc context information (why was this task triggered now)
935 shutdown_task (void *cls,
936 const struct GNUNET_SCHEDULER_TaskContext *tc)
938 while (NULL != incoming_head)
939 incoming_destroy (incoming_head);
941 while (NULL != listeners_head)
942 listener_destroy (listeners_head);
944 while (NULL != sets_head)
945 set_destroy (sets_head);
948 /* it's important to destroy mesh at the end, as tunnels
949 * must be destroyed first! */
952 GNUNET_MESH_disconnect (mesh);
956 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled shutdown request\n");
961 * Signature of the main function of a task.
964 * @param tc context information (why was this task triggered now)
967 incoming_timeout_cb (void *cls,
968 const struct GNUNET_SCHEDULER_TaskContext *tc)
970 struct Incoming *incoming = cls;
972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "remote peer timed out\n");
973 incoming_destroy (incoming);
978 handle_incoming_disconnect (struct OperationState *op_state)
980 struct Incoming *incoming = (struct Incoming *) op_state;
981 if (NULL == incoming->tunnel)
984 incoming_destroy (incoming);
989 * Method called whenever another peer has added us to a tunnel
990 * the other peer initiated.
991 * Only called (once) upon reception of data with a message type which was
992 * subscribed to in GNUNET_MESH_connect. A call to GNUNET_MESH_tunnel_destroy
993 * causes te tunnel to be ignored and no further notifications are sent about
997 * @param tunnel new handle to the tunnel
998 * @param initiator peer that started the tunnel
999 * @param port Port this tunnel is for.
1000 * @return initial tunnel context for the tunnel
1001 * (can be NULL -- that's not an error)
1004 tunnel_new_cb (void *cls,
1005 struct GNUNET_MESH_Tunnel *tunnel,
1006 const struct GNUNET_PeerIdentity *initiator,
1009 struct Incoming *incoming;
1010 static const struct SetVT incoming_vt = {
1011 .msg_handler = handle_incoming_msg,
1012 .peer_disconnect = handle_incoming_disconnect
1015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new incoming tunnel\n");
1017 GNUNET_assert (port == GNUNET_APPLICATION_TYPE_SET);
1018 incoming = GNUNET_new (struct Incoming);
1019 incoming->peer = *initiator;
1020 incoming->tunnel = tunnel;
1021 incoming->tc = GNUNET_new (struct TunnelContext);;
1022 incoming->tc->vt = &incoming_vt;
1023 incoming->tc->op = (struct OperationState *) incoming;
1024 incoming->timeout_task =
1025 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, incoming_timeout_cb, incoming);
1026 GNUNET_CONTAINER_DLL_insert_tail (incoming_head, incoming_tail, incoming);
1028 return incoming->tc;
1033 * Function called whenever a tunnel is destroyed. Should clean up
1034 * any associated state.
1035 * GNUNET_MESH_tunnel_destroy. It must NOT call GNUNET_MESH_tunnel_destroy on
1038 * @param cls closure (set from GNUNET_MESH_connect)
1039 * @param tunnel connection to the other end (henceforth invalid)
1040 * @param tunnel_ctx place where local state associated
1041 * with the tunnel is stored
1044 tunnel_end_cb (void *cls,
1045 const struct GNUNET_MESH_Tunnel *tunnel, void *tunnel_ctx)
1047 struct TunnelContext *ctx = tunnel_ctx;
1049 ctx->vt->peer_disconnect (ctx->op);
1050 /* mesh will never call us with the context again! */
1051 GNUNET_free (tunnel_ctx);
1056 * Functions with this signature are called whenever a message is
1059 * Each time the function must call GNUNET_MESH_receive_done on the tunnel
1060 * in order to receive the next message. This doesn't need to be immediate:
1061 * can be delayed if some processing is done on the message.
1063 * @param cls Closure (set from GNUNET_MESH_connect).
1064 * @param tunnel Connection to the other end.
1065 * @param tunnel_ctx Place to store local state associated with the tunnel.
1066 * @param message The actual message.
1068 * @return GNUNET_OK to keep the tunnel open,
1069 * GNUNET_SYSERR to close it (signal serious error).
1072 dispatch_p2p_message (void *cls,
1073 struct GNUNET_MESH_Tunnel *tunnel,
1075 const struct GNUNET_MessageHeader *message)
1077 struct TunnelContext *tc = *tunnel_ctx;
1080 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "dispatching mesh message (type: %u)\n",
1081 ntohs (message->type));
1082 /* FIXME: do this before or after the handler? */
1083 GNUNET_MESH_receive_done (tunnel);
1084 ret = tc->vt->msg_handler (tc->op, message);
1085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled mesh message (type: %u)\n",
1086 ntohs (message->type));
1092 * Function called by the service's run
1093 * method to run service-specific setup code.
1095 * @param cls closure
1096 * @param server the initialized server
1097 * @param cfg configuration to use
1100 run (void *cls, struct GNUNET_SERVER_Handle *server,
1101 const struct GNUNET_CONFIGURATION_Handle *cfg)
1103 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1104 {handle_client_accept, NULL, GNUNET_MESSAGE_TYPE_SET_ACCEPT,
1105 sizeof (struct GNUNET_SET_AcceptRejectMessage)},
1106 {handle_client_iter_ack, NULL, GNUNET_MESSAGE_TYPE_SET_ITER_ACK, 0},
1107 {handle_client_add_remove, NULL, GNUNET_MESSAGE_TYPE_SET_ADD, 0},
1108 {handle_client_create, NULL, GNUNET_MESSAGE_TYPE_SET_CREATE,
1109 sizeof (struct GNUNET_SET_CreateMessage)},
1110 {handle_client_iterate, NULL, GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST,
1111 sizeof (struct GNUNET_MessageHeader)},
1112 {handle_client_evaluate, NULL, GNUNET_MESSAGE_TYPE_SET_EVALUATE, 0},
1113 {handle_client_listen, NULL, GNUNET_MESSAGE_TYPE_SET_LISTEN,
1114 sizeof (struct GNUNET_SET_ListenMessage)},
1115 {handle_client_reject, NULL, GNUNET_MESSAGE_TYPE_SET_REJECT,
1116 sizeof (struct GNUNET_SET_AcceptRejectMessage)},
1117 {handle_client_add_remove, NULL, GNUNET_MESSAGE_TYPE_SET_REMOVE, 0},
1118 {handle_client_cancel, NULL, GNUNET_MESSAGE_TYPE_SET_REMOVE,
1119 sizeof (struct GNUNET_SET_CancelMessage)},
1122 static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1123 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST, 0},
1124 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_IBF, 0},
1125 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS, 0},
1126 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_DONE, 0},
1127 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENT_REQUESTS, 0},
1128 {dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_SE, 0},
1131 static const uint32_t mesh_ports[] = {GNUNET_APPLICATION_TYPE_SET, 0};
1133 configuration = cfg;
1134 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1135 &shutdown_task, NULL);
1136 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1137 GNUNET_SERVER_add_handlers (server, server_handlers);
1139 mesh = GNUNET_MESH_connect (cfg, NULL, tunnel_new_cb, tunnel_end_cb,
1140 mesh_handlers, mesh_ports);
1143 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not connect to mesh\n");
1147 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "started\n");
1152 * The main function for the set service.
1154 * @param argc number of arguments from the command line
1155 * @param argv command line arguments
1156 * @return 0 ok, 1 on error
1159 main (int argc, char *const *argv)
1162 ret = GNUNET_SERVICE_run (argc, argv, "set",
1163 GNUNET_SERVICE_OPTION_NONE, &run, NULL);
1164 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit (%d)\n", GNUNET_OK != ret);
1165 return (GNUNET_OK == ret) ? 0 : 1;