/*
This file is part of GNUnet
- (C) 2013 Christian Grothoff (and other contributing authors)
+ (C) 2013, 2014 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
-
/**
* @file set/gnunet-service-set.c
* @brief two-peer set operations
* @author Florian Dold
+ * @author Christian Grothoff
*/
+#include "gnunet-service-set.h"
+#include "gnunet-service-set_protocol.h"
+/**
+ * How long do we hold on to an incoming channel if there is
+ * no local listener before giving up?
+ */
+#define INCOMING_CHANNEL_TIMEOUT GNUNET_TIME_UNIT_MINUTES
-#include "gnunet-service-set.h"
-#include "set_protocol.h"
+/**
+ * A listener is inhabited by a client, and waits for evaluation
+ * requests from remote peers.
+ */
+struct Listener
+{
+ /**
+ * Listeners are held in a doubly linked list.
+ */
+ struct Listener *next;
+
+ /**
+ * Listeners are held in a doubly linked list.
+ */
+ struct Listener *prev;
+
+ /**
+ * Client that owns the listener.
+ * Only one client may own a listener.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * Message queue for the client
+ */
+ struct GNUNET_MQ_Handle *client_mq;
+
+ /**
+ * Application ID for the operation, used to distinguish
+ * multiple operations of the same type with the same peer.
+ */
+ struct GNUNET_HashCode app_id;
+
+ /**
+ * The type of the operation.
+ */
+ enum GNUNET_SET_OperationType operation;
+};
/**
* Configuration of our local peer.
*/
-const struct GNUNET_CONFIGURATION_Handle *configuration;
+static const struct GNUNET_CONFIGURATION_Handle *configuration;
/**
- * Socket listening for other peers via stream.
+ * Handle to the cadet service, used to listen for and connect to
+ * remote peers.
*/
-static struct GNUNET_STREAM_ListenSocket *stream_listen_socket;
+static struct GNUNET_CADET_Handle *cadet;
/**
* Sets are held in a doubly linked list.
static struct Listener *listeners_tail;
/**
- * Incoming sockets from remote peers are
- * held in a doubly linked list.
+ * Incoming sockets from remote peers are held in a doubly linked
+ * list.
*/
-static struct Incoming *incoming_head;
+static struct Operation *incoming_head;
/**
- * Incoming sockets from remote peers are
- * held in a doubly linked list.
+ * Incoming sockets from remote peers are held in a doubly linked
+ * list.
*/
-static struct Incoming *incoming_tail;
+static struct Operation *incoming_tail;
/**
- * Counter for allocating unique request IDs for clients.
+ * Counter for allocating unique IDs for clients, used to identify
+ * incoming operation requests from remote peers, that the client can
+ * choose to accept or refuse.
*/
-static uint32_t request_id = 1;
+static uint32_t suggest_id = 1;
/**
- * Disconnect a client and free all resources
- * that the client allocated (e.g. Sets or Listeners)
- *
- * @param client the client to disconnect
- */
-void
-_GSS_client_disconnect (struct GNUNET_SERVER_Client *client)
-{
- /* FIXME: clean up any data structures belonging to the client */
- GNUNET_SERVER_client_disconnect (client);
-}
-
-
-/**
- * Get set that is owned by the client, if any.
+ * Get set that is owned by the given client, if any.
*
* @param client client to look for
* @return set that the client owns, NULL if the client
* does not own a set
*/
static struct Set *
-get_set (struct GNUNET_SERVER_Client *client)
+set_get (struct GNUNET_SERVER_Client *client)
{
struct Set *set;
+
for (set = sets_head; NULL != set; set = set->next)
if (set->client == client)
return set;
/**
- * Get the listener associated to a client, if any.
+ * Get the listener associated with the given client, if any.
*
* @param client the client
* @return listener associated with the client, NULL
* if there isn't any
*/
static struct Listener *
-get_listener (struct GNUNET_SERVER_Client *client)
+listener_get (struct GNUNET_SERVER_Client *client)
{
struct Listener *listener;
+
for (listener = listeners_head; NULL != listener; listener = listener->next)
if (listener->client == client)
return listener;
/**
- * Get the incoming socket associated with the given id
+ * Get the incoming socket associated with the given id.
*
* @param id id to look for
* @return the incoming socket associated with the id,
* or NULL if there is none
*/
-static struct Incoming *
+static struct Operation *
get_incoming (uint32_t id)
{
- struct Incoming *incoming;
- for (incoming = incoming_head; NULL != incoming; incoming = incoming->next)
- if (incoming->request_id == id)
- return incoming;
+ struct Operation *op;
+
+ for (op = incoming_head; NULL != op; op = op->next)
+ if (op->suggest_id == id)
+ {
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ return op;
+ }
return NULL;
}
+/**
+ * Destroy a listener, free all resources associated with it.
+ *
+ * @param listener listener to destroy
+ */
static void
-destroy_incoming (struct Incoming *incoming)
+listener_destroy (struct Listener *listener)
{
+ /* If the client is not dead yet, destroy it.
+ * The client's destroy callback will destroy the listener again. */
+ if (NULL != listener->client)
+ {
+ struct GNUNET_SERVER_Client *client = listener->client;
+
+ listener->client = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Disconnecting listener client\n");
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ if (NULL != listener->client_mq)
+ {
+ GNUNET_MQ_destroy (listener->client_mq);
+ listener->client_mq = NULL;
+ }
+ GNUNET_CONTAINER_DLL_remove (listeners_head,
+ listeners_tail,
+ listener);
+ GNUNET_free (listener);
+}
+
+
+/**
+ * Context for the #garbage_collect_cb().
+ */
+struct GarbageContext
+{
+
+ /**
+ * Map for which we are garbage collecting removed elements.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap *map;
+
+ /**
+ * Lowest generation for which an operation is still pending.
+ */
+ unsigned int min_op_generation;
+
+ /**
+ * Largest generation for which an operation is still pending.
+ */
+ unsigned int max_op_generation;
+
+};
+
+
+/**
+ * Function invoked to check if an element can be removed from
+ * the set's history because it is no longer needed.
+ *
+ * @param cls the `struct GarbageContext *`
+ * @param key key of the element in the map
+ * @param value the `struct ElementEntry *`
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+garbage_collect_cb (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct GarbageContext *gc = cls;
+ struct ElementEntry *ee = value;
+
+ if (GNUNET_YES != ee->removed)
+ return GNUNET_OK;
+ if ( (gc->max_op_generation < ee->generation_added) ||
+ (ee->generation_removed > gc->min_op_generation) )
+ {
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (gc->map,
+ key,
+ ee));
+ GNUNET_free (ee);
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Collect and destroy elements that are not needed anymore, because
+ * their lifetime (as determined by their generation) does not overlap
+ * with any active set operation.
+ *
+ * @param set set to garbage collect
+ */
+static void
+collect_generation_garbage (struct Set *set)
+{
+ struct Operation *op;
+ struct GarbageContext gc;
+
+ gc.min_op_generation = UINT_MAX;
+ gc.max_op_generation = 0;
+ for (op = set->ops_head; NULL != op; op = op->next)
+ {
+ gc.min_op_generation = GNUNET_MIN (gc.min_op_generation,
+ op->generation_created);
+ gc.max_op_generation = GNUNET_MAX (gc.max_op_generation,
+ op->generation_created);
+ }
+ gc.map = set->elements;
+ GNUNET_CONTAINER_multihashmap_iterate (set->elements,
+ &garbage_collect_cb,
+ &gc);
+}
+
+
+/**
+ * Destroy the given operation. Call the implementation-specific
+ * cancel function of the operation. Disconnects from the remote
+ * peer. Does not disconnect the client, as there may be multiple
+ * operations per set.
+ *
+ * @param op operation to destroy
+ * @param gc #GNUNET_YES to perform garbage collection on the set
+ */
+void
+_GSS_operation_destroy (struct Operation *op,
+ int gc)
+{
+ struct Set *set;
+ struct GNUNET_CADET_Channel *channel;
+
+ if (NULL == op->vt)
+ {
+ /* already in #_GSS_operation_destroy() */
+ return;
+ }
+ GNUNET_assert (GNUNET_NO == op->is_incoming);
+ GNUNET_assert (NULL != op->spec);
+ set = op->spec->set;
+ GNUNET_CONTAINER_DLL_remove (set->ops_head,
+ set->ops_tail,
+ op);
+ op->vt->cancel (op);
+ op->vt = NULL;
+ if (NULL != op->spec)
+ {
+ if (NULL != op->spec->context_msg)
+ {
+ GNUNET_free (op->spec->context_msg);
+ op->spec->context_msg = NULL;
+ }
+ GNUNET_free (op->spec);
+ op->spec = NULL;
+ }
+ if (NULL != op->mq)
+ {
+ GNUNET_MQ_destroy (op->mq);
+ op->mq = NULL;
+ }
+ if (NULL != (channel = op->channel))
+ {
+ op->channel = NULL;
+ GNUNET_CADET_channel_destroy (channel);
+ }
+ if (GNUNET_YES == gc)
+ collect_generation_garbage (set);
+ /* We rely on the channel end handler to free 'op'. When 'op->channel' was NULL,
+ * there was a channel end handler that will free 'op' on the call stack. */
+}
+
+
+/**
+ * Iterator over hash map entries to free element entries.
+ *
+ * @param cls closure
+ * @param key current key code
+ * @param value a `struct ElementEntry *` to be free'd
+ * @return #GNUNET_YES (continue to iterate)
+ */
+static int
+destroy_elements_iterator (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct ElementEntry *ee = value;
+
+ GNUNET_free (ee);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Destroy a set, and free all resources and operations associated with it.
+ *
+ * @param set the set to destroy
+ */
+static void
+set_destroy (struct Set *set)
+{
+ if (NULL != set->client)
+ {
+ /* If the client is not dead yet, destroy it. The client's destroy
+ * callback will call `set_destroy()` again in this case. We do
+ * this so that the channel end handler still has a valid set handle
+ * to destroy. */
+ struct GNUNET_SERVER_Client *client = set->client;
+
+ set->client = NULL;
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ GNUNET_assert (NULL != set->state);
+ while (NULL != set->ops_head)
+ _GSS_operation_destroy (set->ops_head, GNUNET_NO);
+ set->vt->destroy_set (set->state);
+ set->state = NULL;
+ if (NULL != set->client_mq)
+ {
+ GNUNET_MQ_destroy (set->client_mq);
+ set->client_mq = NULL;
+ }
+ if (NULL != set->iter)
+ {
+ GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
+ set->iter = NULL;
+ set->iteration_id++;
+ }
+ if (NULL != set->elements)
+ {
+ GNUNET_CONTAINER_multihashmap_iterate (set->elements,
+ &destroy_elements_iterator,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (set->elements);
+ set->elements = NULL;
+ }
+ GNUNET_CONTAINER_DLL_remove (sets_head,
+ sets_tail,
+ set);
+ GNUNET_free (set);
+}
+
+
+/**
+ * Clean up after a client has disconnected
+ *
+ * @param cls closure, unused
+ * @param client the client to clean up after
+ */
+static void
+handle_client_disconnect (void *cls,
+ struct GNUNET_SERVER_Client *client)
+{
+ struct Set *set;
+ struct Listener *listener;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "client disconnected, cleaning up\n");
+ set = set_get (client);
+ if (NULL != set)
+ {
+ set->client = NULL;
+ set_destroy (set);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client's set destroyed\n");
+ }
+ listener = listener_get (client);
+ if (NULL != listener)
+ {
+ listener->client = NULL;
+ listener_destroy (listener);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client's listener destroyed\n");
+ }
+}
+
+
+/**
+ * Destroy an incoming request from a remote peer
+ *
+ * @param incoming remote request to destroy
+ */
+static void
+incoming_destroy (struct Operation *incoming)
+{
+ GNUNET_assert (GNUNET_YES == incoming->is_incoming);
+ GNUNET_CONTAINER_DLL_remove (incoming_head,
+ incoming_tail,
+ incoming);
+ if (GNUNET_SCHEDULER_NO_TASK != incoming->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (incoming->timeout_task);
+ incoming->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ /* make sure that the tunnel end handler will not destroy us again */
+ incoming->vt = NULL;
+ if (NULL != incoming->spec)
+ {
+ GNUNET_free (incoming->spec);
+ incoming->spec = NULL;
+ }
if (NULL != incoming->mq)
{
GNUNET_MQ_destroy (incoming->mq);
incoming->mq = NULL;
}
- if (NULL != incoming->socket)
+ if (NULL != incoming->channel)
{
- GNUNET_STREAM_close (incoming->socket);
- incoming->socket = NULL;
+ GNUNET_CADET_channel_destroy (incoming->channel);
+ incoming->channel = NULL;
}
- GNUNET_CONTAINER_DLL_remove (incoming_head, incoming_tail, incoming);
- GNUNET_free (incoming);
}
/**
- * Handle a request for a set operation for
- * another peer.
+ * Find a listener that is interested in the given operation type
+ * and application id.
*
- * @param cls the incoming socket
- * @param mh the message
+ * @param op operation type to look for
+ * @param app_id application id to look for
+ * @return a matching listener, or NULL if no listener matches the
+ * given operation and application id
*/
+static struct Listener *
+listener_get_by_target (enum GNUNET_SET_OperationType op,
+ const struct GNUNET_HashCode *app_id)
+{
+ struct Listener *listener;
+ for (listener = listeners_head; NULL != listener; listener = listener->next)
+ if ( (listener->operation == op) &&
+ (0 == GNUNET_CRYPTO_hash_cmp (app_id, &listener->app_id)) )
+ return listener;
+ return NULL;
+}
+
+
+/**
+ * Suggest the given request to the listener. The listening client can
+ * then accept or reject the remote request.
+ *
+ * @param incoming the incoming peer with the request to suggest
+ * @param listener the listener to suggest the request to
+ */
static void
-handle_p2p_operation_request (void *cls, const struct GNUNET_MessageHeader *mh)
+incoming_suggest (struct Operation *incoming,
+ struct Listener *listener)
{
- struct Incoming *incoming = cls;
- const struct OperationRequestMessage *msg = (const struct OperationRequestMessage *) mh;
- struct GNUNET_MQ_Message *mqm;
- struct RequestMessage *cmsg;
- struct Listener *listener;
- const struct GNUNET_MessageHeader *context_msg;
+ struct GNUNET_MQ_Envelope *mqm;
+ struct GNUNET_SET_RequestMessage *cmsg;
+
+ GNUNET_assert (GNUNET_YES == incoming->is_incoming);
+ GNUNET_assert (NULL != incoming->spec);
+ GNUNET_assert (0 == incoming->suggest_id);
+ incoming->suggest_id = suggest_id++;
+ if (0 == suggest_id)
+ suggest_id++;
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != incoming->timeout_task);
+ GNUNET_SCHEDULER_cancel (incoming->timeout_task);
+ incoming->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ mqm = GNUNET_MQ_msg_nested_mh (cmsg,
+ GNUNET_MESSAGE_TYPE_SET_REQUEST,
+ incoming->spec->context_msg);
+ GNUNET_assert (NULL != mqm);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Suggesting incoming request with accept id %u to listener\n",
+ incoming->suggest_id);
+ cmsg->accept_id = htonl (incoming->suggest_id);
+ cmsg->peer_id = incoming->spec->peer;
+ GNUNET_MQ_send (listener->client_mq, mqm);
+}
+
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "got operation request\n");
+/**
+ * Handle a request for a set operation from another peer. Checks if we
+ * have a listener waiting for such a request (and in that case initiates
+ * asking the listener about accepting the connection). If no listener
+ * is waiting, we queue the operation request in hope that a listener
+ * shows up soon (before timeout).
+ *
+ * This msg is expected as the first and only msg handled through the
+ * non-operation bound virtual table, acceptance of this operation replaces
+ * our virtual table and subsequent msgs would be routed differently (as
+ * we then know what type of operation this is).
+ *
+ * @param op the operation state
+ * @param mh the received message
+ * @return #GNUNET_OK if the channel should be kept alive,
+ * #GNUNET_SYSERR to destroy the channel
+ */
+static int
+handle_incoming_msg (struct Operation *op,
+ const struct GNUNET_MessageHeader *mh)
+{
+ const struct OperationRequestMessage *msg;
+ struct Listener *listener;
+ struct OperationSpecification *spec;
+ const struct GNUNET_MessageHeader *nested_context;
- if (ntohs (mh->size) < sizeof *msg)
+ msg = (const struct OperationRequestMessage *) mh;
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ if (GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST != ntohs (mh->type))
{
- GNUNET_break (0);
- destroy_incoming (incoming);
- return;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ /* double operation request */
+ if (NULL != op->spec)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ spec = GNUNET_new (struct OperationSpecification);
+ nested_context = GNUNET_MQ_extract_nested_mh (msg);
+ if ( (NULL != nested_context) &&
+ (ntohs (nested_context->size) > GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_free (spec);
+ return GNUNET_SYSERR;
+ }
+ /* Make a copy of the nested_context (application-specific context
+ information that is opaque to set) so we can pass it to the
+ listener later on */
+ if (NULL != spec->context_msg)
+ spec->context_msg = GNUNET_copy_message (nested_context);
+ spec->operation = ntohl (msg->operation);
+ spec->app_id = msg->app_id;
+ spec->salt = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ UINT32_MAX);
+ spec->peer = op->peer;
+ spec->remote_element_count = ntohl (msg->element_count);
+ op->spec = spec;
+
+ listener = listener_get_by_target (ntohl (msg->operation),
+ &msg->app_id);
+ if (NULL == listener)
+ {
+ GNUNET_break (GNUNET_SCHEDULER_NO_TASK != op->timeout_task);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No matching listener for incoming request (op %u, app %s), waiting with timeout\n",
+ ntohl (msg->operation),
+ GNUNET_h2s (&msg->app_id));
+ return GNUNET_OK;
}
- else if (ntohs (mh->size) == sizeof *msg)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received P2P operation request (op %u, app %s) for active listener\n",
+ ntohl (msg->operation),
+ GNUNET_h2s (&msg->app_id));
+ incoming_suggest (op, listener);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Send the next element of a set to the set's client. The next element is given by
+ * the set's current hashmap iterator. The set's iterator will be set to NULL if there
+ * are no more elements in the set. The caller must ensure that the set's iterator is
+ * valid.
+ *
+ * The client will acknowledge each received element with a
+ * #GNUNET_MESSAGE_TYPE_SET_ITER_ACK message. Our
+ * #handle_client_iter_ack() will then trigger the next transmission.
+ * Note that the #GNUNET_MESSAGE_TYPE_SET_ITER_DONE is not acknowledged.
+ *
+ * @param set set that should send its next element to its client
+ */
+static void
+send_client_element (struct Set *set)
+{
+ int ret;
+ struct ElementEntry *ee;
+ struct GNUNET_MQ_Envelope *ev;
+ struct GNUNET_SET_IterResponseMessage *msg;
+
+ GNUNET_assert (NULL != set->iter);
+ ret = GNUNET_CONTAINER_multihashmap_iterator_next (set->iter,
+ NULL,
+ (const void **) &ee);
+ if (GNUNET_NO == ret)
{
- context_msg = NULL;
+ ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_DONE);
+ GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
+ set->iter = NULL;
+ set->iteration_id++;
}
else
{
- context_msg = &msg[1].header;
- if ((ntohs (context_msg->size) + sizeof *msg) != ntohs (msg->header.size))
- {
- /* size of context message is invalid */
- GNUNET_break (0);
- destroy_incoming (incoming);
- return;
- }
+ GNUNET_assert (NULL != ee);
+ ev = GNUNET_MQ_msg_extra (msg,
+ ee->element.size,
+ GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT);
+ memcpy (&msg[1],
+ ee->element.data,
+ ee->element.size);
+ msg->element_type = ee->element.element_type;
+ msg->iteration_id = htons (set->iteration_id);
}
- /* find the appropriate listener */
- for (listener = listeners_head;
- listener != NULL;
- listener = listener->next)
- {
- if ( (0 != GNUNET_CRYPTO_hash_cmp (&msg->app_id, &listener->app_id)) ||
- (htons (msg->operation) != listener->operation) )
- continue;
- mqm = GNUNET_MQ_msg (cmsg, GNUNET_MESSAGE_TYPE_SET_REQUEST);
- if (GNUNET_OK !=
- GNUNET_MQ_nest (mqm, context_msg))
- {
- /* FIXME: disconnect the peer */
- GNUNET_MQ_discard (mqm);
- GNUNET_break (0);
- }
- incoming->request_id = request_id++;
- cmsg->request_id = htonl (incoming->request_id);
- GNUNET_MQ_send (listener->client_mq, mqm);
+ GNUNET_MQ_send (set->client_mq, ev);
+}
+
+
+/**
+ * Called when a client wants to iterate the elements of a set.
+ * Checks if we have a set associated with the client and if we
+ * can right now start an iteration. If all checks out, starts
+ * sending the elements of the set to the client.
+ *
+ * @param cls unused
+ * @param client client that sent the message
+ * @param m message sent by the client
+ */
+static void
+handle_client_iterate (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
+{
+ struct Set *set;
+
+ set = set_get (client);
+ if (NULL == set)
+ {
+ /* attempt to iterate over a non existing set */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ if (NULL != set->iter)
+ {
+ /* Only one concurrent iterate-action allowed per set */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
- /* FIXME: send a reject message */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Iterating union set with %u elements\n",
+ GNUNET_CONTAINER_multihashmap_size (set->elements));
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+ set->iter = GNUNET_CONTAINER_multihashmap_iterator_create (set->elements);
+ send_client_element (set);
}
/**
- * Called when a client wants to create a new set.
+ * Called when a client wants to create a new set. This is typically
+ * the first request from a client, and includes the type of set
+ * operation to be performed.
*
* @param cls unused
* @param client client that sent the message
* @param m message sent by the client
*/
static void
-handle_client_create (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+handle_client_create_set (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
- struct SetCreateMessage *msg = (struct SetCreateMessage *) m;
+ const struct GNUNET_SET_CreateMessage *msg;
struct Set *set;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "new set created\n");
-
- if (NULL != get_set (client))
+ msg = (const struct GNUNET_SET_CreateMessage *) m;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client created new set (operation %u)\n",
+ ntohs (msg->operation));
+ if (NULL != set_get (client))
{
+ /* There can only be one set per client */
GNUNET_break (0);
GNUNET_SERVER_client_disconnect (client);
return;
}
-
set = GNUNET_new (struct Set);
-
- switch (ntohs (msg->operation))
+ switch (ntohl (msg->operation))
{
- case GNUNET_SET_OPERATION_INTERSECTION:
- /* FIXME: cfuchs */
- GNUNET_assert (0);
- break;
- case GNUNET_SET_OPERATION_UNION:
- set = _GSS_union_set_create ();
- break;
- default:
- GNUNET_free (set);
- GNUNET_break (0);
- GNUNET_SERVER_client_disconnect (client);
- return;
+ case GNUNET_SET_OPERATION_INTERSECTION:
+ set->vt = _GSS_intersection_vt ();
+ break;
+ case GNUNET_SET_OPERATION_UNION:
+ set->vt = _GSS_union_vt ();
+ break;
+ default:
+ GNUNET_free (set);
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
}
-
+ set->state = set->vt->create ();
+ set->elements = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
set->client = client;
set->client_mq = GNUNET_MQ_queue_for_server_client (client);
- GNUNET_CONTAINER_DLL_insert (sets_head, sets_tail, set);
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ GNUNET_CONTAINER_DLL_insert (sets_head,
+ sets_tail,
+ set);
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
}
/**
- * Called when a client wants to create a new set.
+ * Called when a client wants to create a new listener.
*
* @param cls unused
* @param client client that sent the message
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *m)
{
- struct ListenMessage *msg = (struct ListenMessage *) m;
+ const struct GNUNET_SET_ListenMessage *msg;
struct Listener *listener;
-
- if (NULL != get_listener (client))
+ struct Operation *op;
+
+ msg = (const struct GNUNET_SET_ListenMessage *) m;
+ if (NULL != listener_get (client))
{
+ /* max. one active listener per client! */
GNUNET_break (0);
GNUNET_SERVER_client_disconnect (client);
return;
}
-
listener = GNUNET_new (struct Listener);
+ listener->client = client;
+ listener->client_mq = GNUNET_MQ_queue_for_server_client (client);
listener->app_id = msg->app_id;
- listener->operation = msg->operation;
- GNUNET_CONTAINER_DLL_insert_tail (listeners_head, listeners_tail, listener);
-
+ listener->operation = ntohl (msg->operation);
+ GNUNET_CONTAINER_DLL_insert_tail (listeners_head,
+ listeners_tail,
+ listener);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "New listener created (op %u, app %s)\n",
+ listener->operation,
+ GNUNET_h2s (&listener->app_id));
+
+ /* check for existing incoming requests the listener might be interested in */
+ for (op = incoming_head; NULL != op; op = op->next)
+ {
+ if (NULL == op->spec)
+ continue; /* no details available yet */
+ if (0 != op->suggest_id)
+ continue; /* this one has been already suggested to a listener */
+ if (listener->operation != op->spec->operation)
+ continue; /* incompatible operation */
+ if (0 != GNUNET_CRYPTO_hash_cmp (&listener->app_id,
+ &op->spec->app_id))
+ continue; /* incompatible appliation */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Found matching existing request\n");
+ incoming_suggest (op,
+ listener);
+ }
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
/**
- * Called when a client wants to create a new set.
+ * Called when the listening client rejects an operation
+ * request by another peer.
*
* @param cls unused
* @param client client that sent the message
* @param m message sent by the client
*/
static void
-handle_client_add (void *cls,
+handle_client_reject (void *cls,
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *m)
+{
+ struct Operation *incoming;
+ const struct GNUNET_SET_RejectMessage *msg;
+
+ msg = (const struct GNUNET_SET_RejectMessage *) m;
+ incoming = get_incoming (ntohl (msg->accept_reject_id));
+ if (NULL == incoming)
+ {
+ /* no matching incoming operation for this reject */
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Peer request (op %u, app %s) rejected by client\n",
+ incoming->spec->operation,
+ GNUNET_h2s (&incoming->spec->app_id));
+ GNUNET_CADET_channel_destroy (incoming->channel);
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+}
+
+
+/**
+ * Called when a client wants to add an element to a set it inhabits.
+ *
+ * @param cls unused
+ * @param client client that sent the message
+ * @param m message sent by the client
+ */
+static void
+handle_client_add (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
struct Set *set;
+ const struct GNUNET_SET_ElementMessage *msg;
+ struct GNUNET_SET_Element el;
+ struct ElementEntry *ee;
+ struct ElementEntry *ee_dup;
- set = get_set (client);
+ set = set_get (client);
if (NULL == set)
{
+ /* client without a set requested an operation */
GNUNET_break (0);
- _GSS_client_disconnect (client);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
- switch (set->operation)
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+ msg = (const struct GNUNET_SET_ElementMessage *) m;
+ el.size = ntohs (m->size) - sizeof *msg;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client inserts element of size %u\n",
+ el.size);
+ el.data = &msg[1];
+ ee = GNUNET_malloc (el.size + sizeof *ee);
+ ee->element.size = el.size;
+ memcpy (&ee[1],
+ el.data,
+ el.size);
+ ee->element.data = &ee[1];
+ ee->generation_added = set->current_generation;
+ ee->remote = GNUNET_NO;
+ GNUNET_CRYPTO_hash (ee->element.data,
+ el.size,
+ &ee->element_hash);
+ ee_dup = GNUNET_CONTAINER_multihashmap_get (set->elements,
+ &ee->element_hash);
+ if (NULL != ee_dup)
{
- case GNUNET_SET_OPERATION_UNION:
- _GSS_union_add ((struct ElementMessage *) m, set);
- case GNUNET_SET_OPERATION_INTERSECTION:
- /* FIXME: cfuchs */
- break;
- default:
- GNUNET_assert (0);
- break;
+ /* same element inserted twice */
+ GNUNET_break (0);
+ GNUNET_free (ee);
+ return;
}
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ GNUNET_break (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_put (set->elements,
+ &ee->element_hash,
+ ee,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ set->vt->add (set->state, ee);
}
/**
- * Called when a client wants to evaluate a set operation with another peer.
+ * Called when a client wants to remove an element from a set it
+ * inhabits.
*
* @param cls unused
* @param client client that sent the message
* @param m message sent by the client
*/
static void
-handle_client_evaluate (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+handle_client_remove (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
struct Set *set;
+ const struct GNUNET_SET_ElementMessage *msg;
+ struct GNUNET_SET_Element el;
+ struct ElementEntry *ee;
+ struct GNUNET_HashCode hash;
- set = get_set (client);
+ set = set_get (client);
if (NULL == set)
{
+ /* client without a set requested an operation */
GNUNET_break (0);
- _GSS_client_disconnect (client);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
-
-
- switch (set->operation)
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+ msg = (const struct GNUNET_SET_ElementMessage *) m;
+ el.size = ntohs (m->size) - sizeof *msg;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client removes element of size %u\n",
+ el.size);
+ el.data = &msg[1];
+ GNUNET_CRYPTO_hash (el.data,
+ el.size,
+ &hash);
+ ee = GNUNET_CONTAINER_multihashmap_get (set->elements,
+ &hash);
+ if (NULL == ee)
{
- case GNUNET_SET_OPERATION_INTERSECTION:
- /* FIXME: cfuchs */
- break;
- case GNUNET_SET_OPERATION_UNION:
- _GSS_union_evaluate ((struct EvaluateMessage *) m, set);
- break;
- default:
- GNUNET_assert (0);
- break;
+ /* Client tried to remove non-existing element */
+ GNUNET_break (0);
+ return;
}
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ if (GNUNET_YES == ee->removed)
+ {
+ /* Client tried to remove element twice */
+ GNUNET_break (0);
+ return;
+ }
+ ee->removed = GNUNET_YES;
+ ee->generation_removed = set->current_generation;
+ set->vt->remove (set->state, ee);
}
/**
- * Handle a cancel request from a client.
+ * Called when a client wants to initiate a set operation with another
+ * peer. Initiates the CADET connection to the listener and sends the
+ * request.
*
* @param cls unused
- * @param client the client
- * @param m the cancel message
+ * @param client client that sent the message
+ * @param m message sent by the client
*/
static void
-handle_client_cancel (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+handle_client_evaluate (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
- /* FIXME: implement */
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ struct Set *set;
+ const struct GNUNET_SET_EvaluateMessage *msg;
+ struct OperationSpecification *spec;
+ struct Operation *op;
+ const struct GNUNET_MessageHeader *context;
+
+ set = set_get (client);
+ if (NULL == set)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ msg = (const struct GNUNET_SET_EvaluateMessage *) m;
+ spec = GNUNET_new (struct OperationSpecification);
+ spec->operation = set->operation;
+ spec->app_id = msg->app_id;
+ spec->salt = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ UINT32_MAX);
+ spec->peer = msg->target_peer;
+ spec->set = set;
+ spec->result_mode = ntohs (msg->result_mode);
+ spec->client_request_id = ntohl (msg->request_id);
+ context = GNUNET_MQ_extract_nested_mh (msg);
+ op = GNUNET_new (struct Operation);
+ op->spec = spec;
+ op->generation_created = set->current_generation++;
+ op->vt = set->vt;
+ GNUNET_CONTAINER_DLL_insert (set->ops_head,
+ set->ops_tail,
+ op);
+ op->channel = GNUNET_CADET_channel_create (cadet,
+ op,
+ &msg->target_peer,
+ GNUNET_APPLICATION_TYPE_SET,
+ GNUNET_CADET_OPTION_RELIABLE);
+ op->mq = GNUNET_CADET_mq_create (op->channel);
+ set->vt->evaluate (op,
+ context);
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
}
/**
- * Handle an ack from a client.
+ * Handle an ack from a client, and send the next element. Note
+ * that we only expect acks for set elements, not after the
+ * #GNUNET_MESSAGE_TYPE_SET_ITER_DONE message.
*
* @param cls unused
* @param client the client
* @param m the message
*/
static void
-handle_client_ack (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+handle_client_iter_ack (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
- /* FIXME: implement */
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ const struct GNUNET_SET_IterAckMessage *ack;
+ struct Set *set;
+
+ set = set_get (client);
+ if (NULL == set)
+ {
+ /* client without a set acknowledged receiving a value */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ if (NULL == set->iter)
+ {
+ /* client sent an ack, but we were not expecting one (as
+ set iteration has finished) */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ ack = (const struct GNUNET_SET_IterAckMessage *) m;
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+ if (ntohl (ack->send_more))
+ {
+ send_client_element (set);
+ }
+ else
+ {
+ GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
+ set->iter = NULL;
+ set->iteration_id++;
+ }
}
/**
- * Handle a request from the client to accept
- * a set operation.
+ * Handle a request from the client to
+ * cancel a running set operation.
*
* @param cls unused
* @param client the client
- * @param m the message
+ * @param mh the message
*/
static void
-handle_client_accept (void *cls,
+handle_client_cancel (void *cls,
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *mh)
{
+ const struct GNUNET_SET_CancelMessage *msg =
+ (const struct GNUNET_SET_CancelMessage *) mh;
struct Set *set;
- struct Incoming *incoming;
- struct AcceptMessage *msg = (struct AcceptMessage *) mh;
-
- set = get_set (client);
-
+ struct Operation *op;
+ int found;
+ set = set_get (client);
if (NULL == set)
{
+ /* client without a set requested an operation */
GNUNET_break (0);
- _GSS_client_disconnect (client);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client requested cancel for op %u\n",
+ ntohl (msg->request_id));
+ found = GNUNET_NO;
+ for (op = set->ops_head; NULL != op; op = op->next)
+ {
+ if (op->spec->client_request_id == ntohl (msg->request_id))
+ {
+ found = GNUNET_YES;
+ break;
+ }
+ }
+ if (GNUNET_NO == found)
+ {
+ /* It may happen that the operation was already destroyed due to
+ * the other peer disconnecting. The client may not know about this
+ * yet and try to cancel the (just barely non-existent) operation.
+ * So this is not a hard error.
+ */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client canceled non-existent op\n");
+ }
+ else
+ {
+ _GSS_operation_destroy (op,
+ GNUNET_YES);
+ }
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+}
- incoming = get_incoming (ntohl (msg->request_id));
- if ( (NULL == incoming) ||
- (incoming->operation != set->operation) )
+/**
+ * Handle a request from the client to accept a set operation that
+ * came from a remote peer. We forward the accept to the associated
+ * operation for handling
+ *
+ * @param cls unused
+ * @param client the client
+ * @param mh the message
+ */
+static void
+handle_client_accept (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *mh)
+{
+ struct Set *set;
+ const struct GNUNET_SET_AcceptMessage *msg;
+ struct Operation *op;
+ struct GNUNET_SET_ResultMessage *result_message;
+ struct GNUNET_MQ_Envelope *ev;
+
+ msg = (const struct GNUNET_SET_AcceptMessage *) mh;
+ set = set_get (client);
+ if (NULL == set)
{
+ /* client without a set requested to accept */
GNUNET_break (0);
- _GSS_client_disconnect (client);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
+ op = get_incoming (ntohl (msg->accept_reject_id));
+ if (NULL == op)
+ {
+ /* It is not an error if the set op does not exist -- it may
+ * have been destroyed when the partner peer disconnected. */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client accepted request that is no longer active\n");
+ ev = GNUNET_MQ_msg (result_message,
+ GNUNET_MESSAGE_TYPE_SET_RESULT);
+ result_message->request_id = msg->request_id;
+ result_message->element_type = 0;
+ result_message->result_status = htons (GNUNET_SET_STATUS_FAILURE);
+ GNUNET_MQ_send (set->client_mq, ev);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client accepting request %u\n",
+ ntohl (msg->accept_reject_id));
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ op->is_incoming = GNUNET_NO;
+ GNUNET_CONTAINER_DLL_remove (incoming_head,
+ incoming_tail,
+ op);
+ op->spec->set = set;
+ GNUNET_CONTAINER_DLL_insert (set->ops_head,
+ set->ops_tail,
+ op);
+ op->spec->client_request_id = ntohl (msg->request_id);
+ op->spec->result_mode = ntohl (msg->result_mode);
+ op->generation_created = set->current_generation++;
+ op->vt = set->vt;
+ op->vt->accept (op);
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+}
+
- switch (set->operation)
+/**
+ * Called to clean up, after a shutdown has been requested.
+ *
+ * @param cls closure
+ * @param tc context information (why was this task triggered now)
+ */
+static void
+shutdown_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ while (NULL != incoming_head)
+ incoming_destroy (incoming_head);
+ while (NULL != listeners_head)
+ listener_destroy (listeners_head);
+ while (NULL != sets_head)
+ set_destroy (sets_head);
+
+ /* it's important to destroy cadet at the end, as all channels
+ * must be destroyed before the cadet handle! */
+ if (NULL != cadet)
{
- case GNUNET_SET_OPERATION_INTERSECTION:
- /* FIXME: cfuchs*/
- GNUNET_assert (0);
- break;
- case GNUNET_SET_OPERATION_UNION:
- _GSS_union_accept (msg, set, incoming);
- break;
- default:
- GNUNET_assert (0);
- break;
+ GNUNET_CADET_disconnect (cadet);
+ cadet = NULL;
}
- /* FIXME: destroy incoming */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "handled shutdown request\n");
+}
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+
+/**
+ * Timeout happens iff:
+ * - we suggested an operation to our listener,
+ * but did not receive a response in time
+ * - we got the channel from a peer but no #GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST
+ * - shutdown (obviously)
+ *
+ * @param cls channel context
+ * @param tc context information (why was this task triggered now)
+ */
+static void
+incoming_timeout_cb (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Operation *incoming = cls;
+
+ incoming->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (GNUNET_YES == incoming->is_incoming);
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Remote peer's incoming request timed out\n");
+ incoming_destroy (incoming);
}
/**
- * Functions of this type are called upon new stream connection from other peers
- * or upon binding error which happen when the app_port given in
- * GNUNET_STREAM_listen() is already taken.
+ * Terminates an incoming operation in case we have not yet received an
+ * operation request. Called by the channel destruction handler.
*
- * @param cls the closure from GNUNET_STREAM_listen
- * @param socket the socket representing the stream; NULL on binding error
- * @param initiator the identity of the peer who wants to establish a stream
- * with us; NULL on binding error
- * @return GNUNET_OK to keep the socket open, GNUNET_SYSERR to close the
- * stream (the socket will be invalid after the call)
+ * @param op the channel context
*/
-static int
-stream_listen_cb (void *cls,
- struct GNUNET_STREAM_Socket *socket,
- const struct GNUNET_PeerIdentity *initiator)
-{
- struct Incoming *incoming;
- static const struct GNUNET_MQ_Handler handlers[] = {
- {handle_p2p_operation_request, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST},
- GNUNET_MQ_HANDLERS_END
+static void
+handle_incoming_disconnect (struct Operation *op)
+{
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ /* channel is already dead, incoming_destroy must not
+ * destroy it ... */
+ op->channel = NULL;
+ incoming_destroy (op);
+ op->vt = NULL;
+}
+
+
+/**
+ * Method called whenever another peer has added us to a channel the
+ * other peer initiated. Only called (once) upon reception of data
+ * with a message type which was subscribed to in
+ * GNUNET_CADET_connect().
+ *
+ * The channel context represents the operation itself and gets added to a DLL,
+ * from where it gets looked up when our local listener client responds
+ * to a proposed/suggested operation or connects and associates with this operation.
+ *
+ * @param cls closure
+ * @param channel new handle to the channel
+ * @param initiator peer that started the channel
+ * @param port Port this channel is for.
+ * @param options Unused.
+ * @return initial channel context for the channel
+ * returns NULL on error
+ */
+static void *
+channel_new_cb (void *cls,
+ struct GNUNET_CADET_Channel *channel,
+ const struct GNUNET_PeerIdentity *initiator,
+ uint32_t port,
+ enum GNUNET_CADET_ChannelOption options)
+{
+ static const struct SetVT incoming_vt = {
+ .msg_handler = &handle_incoming_msg,
+ .peer_disconnect = &handle_incoming_disconnect
};
+ struct Operation *incoming;
- if (NULL == socket)
+ if (GNUNET_APPLICATION_TYPE_SET != port)
{
GNUNET_break (0);
- return GNUNET_SYSERR;
+ GNUNET_CADET_channel_destroy (channel);
+ return NULL;
}
-
- incoming = GNUNET_new (struct Incoming);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "New incoming channel\n");
+ incoming = GNUNET_new (struct Operation);
+ incoming->is_incoming = GNUNET_YES;
incoming->peer = *initiator;
- incoming->socket = socket;
- incoming->mq = GNUNET_MQ_queue_for_stream_socket (incoming->socket, handlers, incoming);
- /* FIXME: timeout for peers that only connect but don't send anything */
- GNUNET_CONTAINER_DLL_insert_tail (incoming_head, incoming_tail, incoming);
- return GNUNET_OK;
+ incoming->channel = channel;
+ incoming->mq = GNUNET_CADET_mq_create (incoming->channel);
+ incoming->vt = &incoming_vt;
+ incoming->timeout_task
+ = GNUNET_SCHEDULER_add_delayed (INCOMING_CHANNEL_TIMEOUT,
+ &incoming_timeout_cb,
+ incoming);
+ GNUNET_CONTAINER_DLL_insert_tail (incoming_head,
+ incoming_tail,
+ incoming);
+ return incoming;
}
/**
- * Called to clean up, after a shutdown has been requested.
+ * Function called whenever a channel is destroyed. Should clean up
+ * any associated state. It must NOT call
+ * GNUNET_CADET_channel_destroy() on the channel.
*
- * @param cls closure
- * @param tc context information (why was this task triggered now)
+ * The peer_disconnect function is part of a a virtual table set initially either
+ * when a peer creates a new channel with us (#channel_new_cb()), or once we create
+ * a new channel ourselves (evaluate).
+ *
+ * Once we know the exact type of operation (union/intersection), the vt is
+ * replaced with an operation specific instance (_GSS_[op]_vt).
+ *
+ * @param cls closure (set from GNUNET_CADET_connect())
+ * @param channel connection to the other end (henceforth invalid)
+ * @param channel_ctx place where local state associated
+ * with the channel is stored
*/
static void
-shutdown_task (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+channel_end_cb (void *cls,
+ const struct GNUNET_CADET_Channel *channel,
+ void *channel_ctx)
{
- if (NULL != stream_listen_socket)
+ struct Operation *op = channel_ctx;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "channel_end_cb called\n");
+ op->channel = NULL;
+ /* the vt can be null if a client already requested canceling op. */
+ if (NULL != op->vt)
{
- GNUNET_STREAM_listen_close (stream_listen_socket);
- stream_listen_socket = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "calling peer disconnect due to channel end\n");
+ op->vt->peer_disconnect (op);
}
+ if (GNUNET_YES != op->keep)
+ {
+ /* cadet will never call us with the context again! */
+ GNUNET_free (op);
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "channel_end_cb finished\n");
+}
+
+
+/**
+ * Functions with this signature are called whenever a message is
+ * received via a cadet channel.
+ *
+ * The msg_handler is a virtual table set in initially either when a peer
+ * creates a new channel with us (channel_new_cb), or once we create a new channel
+ * ourselves (evaluate).
+ *
+ * Once we know the exact type of operation (union/intersection), the vt is
+ * replaced with an operation specific instance (_GSS_[op]_vt).
+ *
+ * @param cls Closure (set from GNUNET_CADET_connect()).
+ * @param channel Connection to the other end.
+ * @param channel_ctx Place to store local state associated with the channel.
+ * @param message The actual message.
+ * @return #GNUNET_OK to keep the channel open,
+ * #GNUNET_SYSERR to close it (signal serious error).
+ */
+static int
+dispatch_p2p_message (void *cls,
+ struct GNUNET_CADET_Channel *channel,
+ void **channel_ctx,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct Operation *op = *channel_ctx;
+ int ret;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "handled shutdown request\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Dispatching cadet message (type: %u)\n",
+ ntohs (message->type));
+ /* do this before the handler, as the handler might kill the channel */
+ GNUNET_CADET_receive_done (channel);
+ if (NULL != op->vt)
+ ret = op->vt->msg_handler (op,
+ message);
+ else
+ ret = GNUNET_SYSERR;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Handled cadet message (type: %u)\n",
+ ntohs (message->type));
+ return ret;
}
* @param cfg configuration to use
*/
static void
-run (void *cls, struct GNUNET_SERVER_Handle *server, const struct GNUNET_CONFIGURATION_Handle *cfg)
+run (void *cls, struct GNUNET_SERVER_Handle *server,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
{
static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
- {handle_client_create, NULL, GNUNET_MESSAGE_TYPE_SET_CREATE, 0},
- {handle_client_listen, NULL, GNUNET_MESSAGE_TYPE_SET_LISTEN, 0},
- {handle_client_add, NULL, GNUNET_MESSAGE_TYPE_SET_ADD, 0},
- {handle_client_cancel, NULL, GNUNET_MESSAGE_TYPE_SET_CANCEL, 0},
- {handle_client_evaluate, NULL, GNUNET_MESSAGE_TYPE_SET_EVALUATE, 0},
- {handle_client_ack, NULL, GNUNET_MESSAGE_TYPE_SET_ACK, 0},
- {handle_client_accept, NULL, GNUNET_MESSAGE_TYPE_SET_ACCEPT, 0},
- {NULL, NULL, 0, 0}
+ { &handle_client_accept, NULL,
+ GNUNET_MESSAGE_TYPE_SET_ACCEPT,
+ sizeof (struct GNUNET_SET_AcceptMessage)},
+ { &handle_client_iter_ack, NULL,
+ GNUNET_MESSAGE_TYPE_SET_ITER_ACK,
+ sizeof (struct GNUNET_SET_IterAckMessage) },
+ { &handle_client_add, NULL,
+ GNUNET_MESSAGE_TYPE_SET_ADD,
+ 0},
+ { &handle_client_create_set, NULL,
+ GNUNET_MESSAGE_TYPE_SET_CREATE,
+ sizeof (struct GNUNET_SET_CreateMessage)},
+ { &handle_client_iterate, NULL,
+ GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST,
+ sizeof (struct GNUNET_MessageHeader)},
+ { &handle_client_evaluate, NULL,
+ GNUNET_MESSAGE_TYPE_SET_EVALUATE,
+ 0},
+ { &handle_client_listen, NULL,
+ GNUNET_MESSAGE_TYPE_SET_LISTEN,
+ sizeof (struct GNUNET_SET_ListenMessage)},
+ { &handle_client_reject, NULL,
+ GNUNET_MESSAGE_TYPE_SET_REJECT,
+ sizeof (struct GNUNET_SET_RejectMessage)},
+ { &handle_client_remove, NULL,
+ GNUNET_MESSAGE_TYPE_SET_REMOVE,
+ 0},
+ { &handle_client_cancel, NULL,
+ GNUNET_MESSAGE_TYPE_SET_CANCEL,
+ sizeof (struct GNUNET_SET_CancelMessage)},
+ { NULL, NULL, 0, 0}
+ };
+ static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = {
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENT_REQUESTS, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF, 0},
+ { &dispatch_p2p_message, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE, 0},
+ {NULL, 0, 0}
};
+ static const uint32_t cadet_ports[] = {GNUNET_APPLICATION_TYPE_SET, 0};
configuration = cfg;
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, NULL);
- GNUNET_SERVER_add_handlers (server, server_handlers);
- stream_listen_socket = GNUNET_STREAM_listen (cfg, GNUNET_APPLICATION_TYPE_SET,
- &stream_listen_cb, NULL,
- GNUNET_STREAM_OPTION_END);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
+ &shutdown_task, NULL);
+ GNUNET_SERVER_disconnect_notify (server,
+ &handle_client_disconnect, NULL);
+ GNUNET_SERVER_add_handlers (server,
+ server_handlers);
+ cadet = GNUNET_CADET_connect (cfg, NULL,
+ &channel_new_cb,
+ &channel_end_cb,
+ cadet_handlers,
+ cadet_ports);
+ if (NULL == cadet)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Could not connect to cadet service\n"));
+ return;
+ }
}
* @return 0 ok, 1 on error
*/
int
-main (int argc, char *const *argv)
+main (int argc,
+ char *const *argv)
{
int ret;
- ret = GNUNET_SERVICE_run (argc, argv, "set", GNUNET_SERVICE_OPTION_NONE, &run, NULL);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit\n");
+
+ ret = GNUNET_SERVICE_run (argc, argv, "set",
+ GNUNET_SERVICE_OPTION_NONE,
+ &run, NULL);
return (GNUNET_OK == ret) ? 0 : 1;
}
+/* end of gnunet-service-set.c */