--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2011, 2017 GNUnet e.V.
+
+ 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 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+/**
+ * @file cadet/cadet_api.c
+ * @brief cadet api: client implementation of cadet service
+ * @author Bartlomiej Polot
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_constants.h"
+#include "gnunet_cadet_service.h"
+#include "cadet.h"
+#include "cadet_protocol.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "cadet-api",__VA_ARGS__)
+
+/**
+ * Ugly legacy hack.
+ */
+union CadetInfoCB
+{
+
+ /**
+ * Channel callback.
+ */
+ GNUNET_CADET_ChannelCB channel_cb;
+
+ /**
+ * Monitor callback
+ */
+ GNUNET_CADET_PeersCB peers_cb;
+
+ /**
+ * Monitor callback
+ */
+ GNUNET_CADET_PeerCB peer_cb;
+
+ /**
+ * Monitor callback
+ */
+ GNUNET_CADET_TunnelsCB tunnels_cb;
+
+ /**
+ * Tunnel callback.
+ */
+ GNUNET_CADET_TunnelCB tunnel_cb;
+};
+
+
+/**
+ * Opaque handle to the service.
+ */
+struct GNUNET_CADET_Handle
+{
+ /**
+ * Message queue.
+ */
+ struct GNUNET_MQ_Handle *mq;
+
+ /**
+ * Ports open.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap *ports;
+
+ /**
+ * Channels open.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap32 *channels;
+
+ /**
+ * child of the next channel to create (to avoid reusing IDs often)
+ */
+ struct GNUNET_CADET_ClientChannelNumber next_ccn;
+
+ /**
+ * Configuration given by the client, in case of reconnection
+ */
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+ /**
+ * Task for trying to reconnect.
+ */
+ struct GNUNET_SCHEDULER_Task *reconnect_task;
+
+ /**
+ * Callback for an info task (only one active at a time).
+ */
+ union CadetInfoCB info_cb;
+
+ /**
+ * Info callback closure for @c info_cb.
+ */
+ void *info_cls;
+
+ /**
+ * Time to the next reconnect in case one reconnect fails
+ */
+ struct GNUNET_TIME_Relative reconnect_time;
+
+};
+
+
+/**
+ * Opaque handle to a channel.
+ */
+struct GNUNET_CADET_Channel
+{
+
+ /**
+ * Other end of the channel.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Handle to the cadet this channel belongs to
+ */
+ struct GNUNET_CADET_Handle *cadet;
+
+ /**
+ * Channel's port, if incoming.
+ */
+ struct GNUNET_CADET_Port *incoming_port;
+
+ /**
+ * Any data the caller wants to put in here, used for the
+ * various callbacks (@e disconnects, @e window_changes, handlers).
+ */
+ void *ctx;
+
+ /**
+ * Message Queue for the channel.
+ */
+ struct GNUNET_MQ_Handle *mq;
+
+ /**
+ * Task to allow mq to send more traffic.
+ */
+ struct GNUNET_SCHEDULER_Task *mq_cont;
+
+ /**
+ * Pending envelope in case we don't have an ACK from the service.
+ */
+ struct GNUNET_MQ_Envelope *pending_env;
+
+ /**
+ * Window change handler.
+ */
+ GNUNET_CADET_WindowSizeEventHandler window_changes;
+
+ /**
+ * Disconnect handler.
+ */
+ GNUNET_CADET_DisconnectEventHandler disconnects;
+
+ /**
+ * Local ID of the channel, #GNUNET_CADET_LOCAL_CHANNEL_ID_CLI bit is set if outbound.
+ */
+ struct GNUNET_CADET_ClientChannelNumber ccn;
+
+ /**
+ * Channel options: reliability, etc.
+ */
+ enum GNUNET_CADET_ChannelOption options;
+
+ /**
+ * Are we allowed to send to the service?
+ */
+ unsigned int allow_send;
+
+};
+
+
+/**
+ * Opaque handle to a port.
+ */
+struct GNUNET_CADET_Port
+{
+ /**
+ * Handle to the CADET session this port belongs to.
+ */
+ struct GNUNET_CADET_Handle *cadet;
+
+ /**
+ * Callback handler for incoming channels on this port.
+ */
+ GNUNET_CADET_InboundChannelNotificationHandler *handler;
+
+ /**
+ * Closure for @a handler.
+ */
+ void *cls;
+
+ /**
+ * Port "number"
+ */
+ struct GNUNET_HashCode id;
+
+ /**
+ * Handler for incoming channels on this port
+ */
+ GNUNET_CADET_ConnectEventHandler connects;
+
+ /**
+ * Closure for @ref connects
+ */
+ void *connects_cls;
+
+ /**
+ * Window size change handler.
+ */
+ GNUNET_CADET_WindowSizeEventHandler window_changes;
+
+ /**
+ * Handler called when an incoming channel is destroyed..
+ */
+ GNUNET_CADET_DisconnectEventHandler disconnects;
+
+ /**
+ * Payload handlers for incoming channels.
+ */
+ struct GNUNET_MQ_MessageHandler *handlers;
+};
+
+
+/**
+ * Find the Port struct for a hash.
+ *
+ * @param h CADET handle.
+ * @param hash HashCode for the port number.
+ * @return The port handle if known, NULL otherwise.
+ */
+static struct GNUNET_CADET_Port *
+find_port (const struct GNUNET_CADET_Handle *h,
+ const struct GNUNET_HashCode *hash)
+{
+ return GNUNET_CONTAINER_multihashmap_get (h->ports,
+ hash);
+}
+
+
+/**
+ * Get the channel handler for the channel specified by id from the given handle
+ *
+ * @param h Cadet handle
+ * @param ccn ID of the wanted channel
+ * @return handle to the required channel or NULL if not found
+ */
+static struct GNUNET_CADET_Channel *
+find_channel (struct GNUNET_CADET_Handle *h,
+ struct GNUNET_CADET_ClientChannelNumber ccn)
+{
+ return GNUNET_CONTAINER_multihashmap32_get (h->channels,
+ ntohl (ccn.channel_of_client));
+}
+
+
+/**
+ * Create a new channel and insert it in the channel list of the cadet handle
+ *
+ * @param h Cadet handle
+ * @param ccnp pointer to desired ccn of the channel, NULL to assign one automatically.
+ * @return Handle to the created channel.
+ */
+static struct GNUNET_CADET_Channel *
+create_channel (struct GNUNET_CADET_Handle *h,
+ const struct GNUNET_CADET_ClientChannelNumber *ccnp)
+{
+ struct GNUNET_CADET_Channel *ch;
+ struct GNUNET_CADET_ClientChannelNumber ccn;
+
+ ch = GNUNET_new (struct GNUNET_CADET_Channel);
+ ch->cadet = h;
+ if (NULL == ccnp)
+ {
+ while (NULL !=
+ find_channel (h,
+ h->next_ccn))
+ h->next_ccn.channel_of_client
+ = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI | (1 + ntohl (h->next_ccn.channel_of_client)));
+ ccn = h->next_ccn;
+ }
+ else
+ {
+ ccn = *ccnp;
+ }
+ ch->ccn = ccn;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap32_put (h->channels,
+ ntohl (ch->ccn.channel_of_client),
+ ch,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ return ch;
+}
+
+
+/**
+ * Destroy the specified channel.
+ * - Destroys all peers, calling the disconnect callback on each if needed
+ * - Cancels all outgoing traffic for that channel, calling respective notifys
+ * - Calls cleaner if channel was inbound
+ * - Frees all memory used
+ *
+ * @param ch Pointer to the channel.
+ * @param call_cleaner Whether to call the cleaner handler.
+ */
+static void
+destroy_channel (struct GNUNET_CADET_Channel *ch)
+{
+ struct GNUNET_CADET_Handle *h = ch->cadet;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ " destroy_channel %X of %p\n",
+ ch->ccn,
+ h);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap32_remove (h->channels,
+ ntohl (ch->ccn.channel_of_client),
+ ch));
+ if (NULL != ch->mq_cont)
+ {
+ GNUNET_SCHEDULER_cancel (ch->mq_cont);
+ ch->mq_cont = NULL;
+ }
+ /* signal channel destruction */
+ if (NULL != ch->disconnects)
+ ch->disconnects (ch->ctx,
+ ch);
+ GNUNET_free (ch);
+}
+
+
+/**
+ * Reconnect to the service, retransmit all infomation to try to restore the
+ * original state.
+ *
+ * @param h handle to the cadet
+ */
+static void
+reconnect (struct GNUNET_CADET_Handle *h);
+
+
+/**
+ * Reconnect callback: tries to reconnect again after a failer previous
+ * reconnecttion
+ *
+ * @param cls closure (cadet handle)
+ */
+static void
+reconnect_cbk (void *cls)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+
+ h->reconnect_task = NULL;
+ reconnect (h);
+}
+
+
+/**
+ * Reconnect to the service, retransmit all infomation to try to restore the
+ * original state.
+ *
+ * @param h handle to the cadet
+ *
+ * @return #GNUNET_YES in case of sucess, #GNUNET_NO otherwise (service down...)
+ */
+static void
+schedule_reconnect (struct GNUNET_CADET_Handle *h)
+{
+ if (NULL == h->reconnect_task)
+ {
+ h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
+ &reconnect_cbk, h);
+ h->reconnect_time = GNUNET_TIME_STD_BACKOFF (h->reconnect_time);
+ }
+}
+
+
+/**
+ * Notify the application about a change in the window size (if needed).
+ *
+ * @param ch Channel to notify about.
+ */
+static void
+notify_window_size (struct GNUNET_CADET_Channel *ch)
+{
+ if (NULL != ch->window_changes)
+ ch->window_changes (ch->ctx, ch,
+ ch->allow_send);
+}
+
+
+/**
+ * Allow the MQ implementation to send the next message.
+ *
+ * @param cls Closure (channel whose mq to activate).
+ */
+static void
+cadet_mq_send_continue (void *cls)
+{
+ struct GNUNET_CADET_Channel *ch = cls;
+
+ ch->mq_cont = NULL;
+ GNUNET_MQ_impl_send_continue (ch->mq);
+}
+
+/**
+ * Implement sending functionality of a message queue for
+ * us sending messages to a peer.
+ *
+ * Encapsulates the payload message in a #GNUNET_CADET_LocalData message
+ * in order to label the message with the channel ID and send the
+ * encapsulated message to the service.
+ *
+ * @param mq the message queue
+ * @param msg the message to send
+ * @param impl_state state of the implementation
+ */
+static void
+cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq,
+ const struct GNUNET_MessageHeader *msg,
+ void *impl_state)
+{
+ struct GNUNET_CADET_Channel *ch = impl_state;
+ struct GNUNET_CADET_Handle *h = ch->cadet;
+ uint16_t msize;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_CADET_LocalData *cadet_msg;
+
+
+ if (NULL == h->mq)
+ {
+ /* We're currently reconnecting, pretend this worked */
+ GNUNET_MQ_impl_send_continue (mq);
+ return;
+ }
+
+ /* check message size for sanity */
+ msize = ntohs (msg->size);
+ if (msize > GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ GNUNET_MQ_impl_send_continue (mq);
+ return;
+ }
+
+ env = GNUNET_MQ_msg_nested_mh (cadet_msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
+ msg);
+ cadet_msg->ccn = ch->ccn;
+
+ if (0 < ch->allow_send)
+ {
+ /* Service has allowed this message, just send it and continue accepting */
+ GNUNET_MQ_send (h->mq, env);
+ ch->allow_send--;
+ ch->mq_cont = GNUNET_SCHEDULER_add_now (&cadet_mq_send_continue, ch);
+ // notify_window_size (ch); /* FIXME add "verbose" setting? */
+ }
+ else
+ {
+ /* Service has NOT allowed this message, queue it and wait for an ACK */
+ GNUNET_assert (NULL == ch->pending_env);
+ ch->pending_env = env;
+ }
+}
+
+
+/**
+ * Handle destruction of a message queue. Implementations must not
+ * free @a mq, but should take care of @a impl_state.
+ *
+ * @param mq the message queue to destroy
+ * @param impl_state state of the implementation
+ */
+static void
+cadet_mq_destroy_impl (struct GNUNET_MQ_Handle *mq,
+ void *impl_state)
+{
+ struct GNUNET_CADET_Channel *ch = impl_state;
+
+ GNUNET_assert (mq == ch->mq);
+ ch->mq = NULL;
+}
+
+
+/**
+ * We had an error processing a message we forwarded from a peer to
+ * the CADET service. We should just complain about it but otherwise
+ * continue processing.
+ *
+ * @param cls closure with our `struct GNUNET_CADET_Channel`
+ * @param error error code
+ */
+static void
+cadet_mq_error_handler (void *cls,
+ enum GNUNET_MQ_Error error)
+{
+ struct GNUNET_CADET_Channel *ch = cls;
+
+ GNUNET_break_op (0);
+ if (GNUNET_MQ_ERROR_NO_MATCH)
+ {
+ /* Got a message we did not understand, still try to continue! */
+ GNUNET_CADET_receive_done (ch);
+ }
+}
+
+
+/**
+ * Implementation function that cancels the currently sent message.
+ * Should basically undo whatever #mq_send_impl() did.
+ *
+ * @param mq message queue
+ * @param impl_state state specific to the implementation
+ */
+static void
+cadet_mq_cancel_impl (struct GNUNET_MQ_Handle *mq,
+ void *impl_state)
+{
+ struct GNUNET_CADET_Channel *ch = impl_state;
+
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "Cannot cancel mq message on channel %X of %p\n",
+ ch->ccn.channel_of_client,
+ ch->cadet);
+ GNUNET_break (0);
+}
+
+
+/**
+ * Process the new channel notification and add it to the channels in the handle
+ *
+ * @param h The cadet handle
+ * @param msg A message with the details of the new incoming channel
+ */
+static void
+handle_channel_created (void *cls,
+ const struct GNUNET_CADET_LocalChannelCreateMessage *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ struct GNUNET_CADET_Channel *ch;
+ struct GNUNET_CADET_Port *port;
+ const struct GNUNET_HashCode *port_number;
+ struct GNUNET_CADET_ClientChannelNumber ccn;
+
+ ccn = msg->ccn;
+ port_number = &msg->port;
+ if (ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ port = find_port (h, port_number);
+ if (NULL == port)
+ {
+ /* We could have closed the port but the service didn't know about it yet
+ * This is not an error.
+ */
+ struct GNUNET_CADET_LocalChannelDestroyMessage *d_msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ GNUNET_break (0);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "No handler for incoming channel %X (on port %s, recently closed?)\n",
+ ntohl (ccn.channel_of_client),
+ GNUNET_h2s (port_number));
+ env = GNUNET_MQ_msg (d_msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
+ d_msg->ccn = msg->ccn;
+ GNUNET_MQ_send (h->mq,
+ env);
+ return;
+ }
+
+ ch = create_channel (h,
+ &ccn);
+ ch->peer = msg->peer;
+ ch->cadet = h;
+ ch->incoming_port = port;
+ ch->options = ntohl (msg->opt);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating incoming channel %X [%s] %p\n",
+ ntohl (ccn.channel_of_client),
+ GNUNET_h2s (port_number),
+ ch);
+
+ GNUNET_assert (NULL != port->connects);
+ ch->window_changes = port->window_changes;
+ ch->disconnects = port->disconnects;
+ ch->mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl,
+ &cadet_mq_destroy_impl,
+ &cadet_mq_cancel_impl,
+ ch,
+ port->handlers,
+ &cadet_mq_error_handler,
+ ch);
+ ch->ctx = port->connects (port->cls,
+ ch,
+ &msg->peer);
+ GNUNET_MQ_set_handlers_closure (ch->mq,
+ ch->ctx);
+}
+
+
+/**
+ * Process the channel destroy notification and free associated resources
+ *
+ * @param h The cadet handle
+ * @param msg A message with the details of the channel being destroyed
+ */
+static void
+handle_channel_destroy (void *cls,
+ const struct GNUNET_CADET_LocalChannelDestroyMessage *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ struct GNUNET_CADET_Channel *ch;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received channel destroy for channel %X from CADET service\n",
+ ntohl (msg->ccn.channel_of_client));
+ ch = find_channel (h,
+ msg->ccn);
+ if (NULL == ch)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ destroy_channel (ch);
+}
+
+
+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param message the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ * #GNUNET_SYSERR otherwise
+ */
+static int
+check_local_data (void *cls,
+ const struct GNUNET_CADET_LocalData *message)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ struct GNUNET_CADET_Channel *ch;
+ uint16_t size;
+
+ size = ntohs (message->header.size);
+ if (sizeof (*message) + sizeof (struct GNUNET_MessageHeader) > size)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
+ ch = find_channel (h,
+ message->ccn);
+ if (NULL == ch)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process the incoming data packets, call appropriate handlers.
+ *
+ * @param h The cadet handle
+ * @param message A message encapsulating the data
+ */
+static void
+handle_local_data (void *cls,
+ const struct GNUNET_CADET_LocalData *message)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ const struct GNUNET_MessageHeader *payload;
+ struct GNUNET_CADET_Channel *ch;
+ uint16_t type;
+ int fwd;
+
+ ch = find_channel (h,
+ message->ccn);
+ if (NULL == ch)
+ {
+ GNUNET_break_op (0);
+ reconnect (h);
+ return;
+ }
+
+ payload = (struct GNUNET_MessageHeader *) &message[1];
+ type = ntohs (payload->type);
+ fwd = ntohl (ch->ccn.channel_of_client) <= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got a %s data on channel %s [%X] of type %s (%u)\n",
+ GC_f2s (fwd),
+ GNUNET_i2s (&ch->peer),
+ ntohl (message->ccn.channel_of_client),
+ GC_m2s (type),
+ type);
+ GNUNET_MQ_inject_message (ch->mq,
+ payload);
+}
+
+
+/**
+ * Process a local ACK message, enabling the client to send
+ * more data to the service.
+ *
+ * @param h Cadet handle.
+ * @param message Message itself.
+ */
+static void
+handle_local_ack (void *cls,
+ const struct GNUNET_CADET_LocalAck *message)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ struct GNUNET_CADET_Channel *ch;
+
+ ch = find_channel (h,
+ message->ccn);
+ if (NULL == ch)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "ACK on unknown channel %X\n",
+ ntohl (message->ccn.channel_of_client));
+ return;
+ }
+ ch->allow_send++;
+ if (NULL == ch->pending_env)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got an ACK on mq channel %X, allow send now %u!\n",
+ ntohl (ch->ccn.channel_of_client),
+ ch->allow_send);
+ notify_window_size (ch);
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got an ACK on mq channel %X, sending pending message!\n",
+ ntohl (ch->ccn.channel_of_client));
+ GNUNET_MQ_send (h->mq,
+ ch->pending_env);
+ ch->allow_send--;
+ ch->pending_env = NULL;
+ ch->mq_cont = GNUNET_SCHEDULER_add_now (&cadet_mq_send_continue,
+ ch);
+ }
+}
+
+
+/**
+ * Generic error handler, called with the appropriate error code and
+ * the same closure specified at the creation of the message queue.
+ * Not every message queue implementation supports an error handler.
+ *
+ * @param cls closure, a `struct GNUNET_CORE_Handle *`
+ * @param error error code
+ */
+static void
+handle_mq_error (void *cls,
+ enum GNUNET_MQ_Error error)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MQ ERROR: %u\n", error);
+ GNUNET_MQ_destroy (h->mq);
+ h->mq = NULL;
+ reconnect (h);
+}
+
+
+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param message the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ * #GNUNET_SYSERR otherwise
+ */
+static int
+check_get_peers (void *cls,
+ const struct GNUNET_CADET_LocalInfoPeer *message)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ uint16_t size;
+
+ if (NULL == h->info_cb.peers_cb)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ " no handler for peesr monitor message!\n");
+ return GNUNET_SYSERR;
+ }
+
+ size = ntohs (message->header.size);
+ if (sizeof (struct GNUNET_CADET_LocalInfoPeer) > size)
+ {
+ h->info_cb.peers_cb (h->info_cls, NULL, -1, 0, 0);
+ h->info_cb.peers_cb = NULL;
+ h->info_cls = NULL;
+ return GNUNET_SYSERR;
+ }
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a local reply about info on all tunnels, pass info to the user.
+ *
+ * @param cls Closure (Cadet handle).
+ * @param msg Message itself.
+ */
+static void
+handle_get_peers (void *cls,
+ const struct GNUNET_CADET_LocalInfoPeer *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ h->info_cb.peers_cb (h->info_cls, &msg->destination,
+ (int) ntohs (msg->tunnel),
+ (unsigned int ) ntohs (msg->paths),
+ 0);
+}
+
+
+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param message the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ * #GNUNET_SYSERR otherwise
+ */
+static int
+check_get_peer (void *cls,
+ const struct GNUNET_CADET_LocalInfoPeer *message)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ const size_t msize = sizeof (struct GNUNET_CADET_LocalInfoPeer);
+ struct GNUNET_PeerIdentity *paths_array;
+ size_t esize;
+ unsigned int epaths;
+ unsigned int paths;
+ unsigned int peers;
+
+ if (NULL == h->info_cb.peer_cb)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ " no handler for peer monitor message!\n");
+ goto clean_cls;
+ }
+
+ /* Verify message sanity */
+ esize = ntohs (message->header.size);
+ if (esize < msize)
+ {
+ GNUNET_break_op (0);
+ h->info_cb.peer_cb (h->info_cls, NULL, 0, 0, 0, NULL);
+ goto clean_cls;
+ }
+ if (0 != ((esize - msize) % sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break_op (0);
+ h->info_cb.peer_cb (h->info_cls, NULL, 0, 0, 0, NULL);
+ goto clean_cls;
+
+ }
+ peers = (esize - msize) / sizeof (struct GNUNET_PeerIdentity);
+ epaths = (unsigned int) ntohs (message->paths);
+ paths_array = (struct GNUNET_PeerIdentity *) &message[1];
+ paths = 0;
+ for (int i = 0; i < peers; i++)
+ {
+ if (0 == memcmp (&paths_array[i], &message->destination,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ paths++;
+ }
+ }
+ if (paths != epaths)
+ {
+ GNUNET_break_op (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "p:%u, e: %u\n", paths, epaths);
+ h->info_cb.peer_cb (h->info_cls, NULL, 0, 0, 0, NULL);
+ goto clean_cls;
+ }
+
+ return GNUNET_OK;
+
+clean_cls:
+ h->info_cb.peer_cb = NULL;
+ h->info_cls = NULL;
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Process a local peer info reply, pass info to the user.
+ *
+ * @param cls Closure (Cadet handle).
+ * @param message Message itself.
+ */
+static void
+handle_get_peer (void *cls,
+ const struct GNUNET_CADET_LocalInfoPeer *message)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ struct GNUNET_PeerIdentity *paths_array;
+ unsigned int paths;
+ unsigned int path_length;
+ int neighbor;
+ unsigned int peers;
+
+ paths = (unsigned int) ntohs (message->paths);
+ paths_array = (struct GNUNET_PeerIdentity *) &message[1];
+ peers = (ntohs (message->header.size) - sizeof (*message))
+ / sizeof (struct GNUNET_PeerIdentity);
+ path_length = 0;
+ neighbor = GNUNET_NO;
+
+ for (int i = 0; i < peers; i++)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %s\n", GNUNET_i2s (&paths_array[i]));
+ path_length++;
+ if (0 == memcmp (&paths_array[i], &message->destination,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ if (1 == path_length)
+ neighbor = GNUNET_YES;
+ path_length = 0;
+ }
+ }
+
+ /* Call Callback with tunnel info. */
+ paths_array = (struct GNUNET_PeerIdentity *) &message[1];
+ h->info_cb.peer_cb (h->info_cls,
+ &message->destination,
+ (int) ntohs (message->tunnel),
+ neighbor,
+ paths,
+ paths_array);
+}
+
+
+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param msg the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ * #GNUNET_SYSERR otherwise
+ */
+static int
+check_get_tunnels (void *cls,
+ const struct GNUNET_CADET_LocalInfoTunnel *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ uint16_t size;
+
+ if (NULL == h->info_cb.tunnels_cb)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ " no handler for tunnels monitor message!\n");
+ return GNUNET_SYSERR;
+ }
+
+ size = ntohs (msg->header.size);
+ if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) > size)
+ {
+ h->info_cb.tunnels_cb (h->info_cls, NULL, 0, 0, 0, 0);
+ h->info_cb.tunnels_cb = NULL;
+ h->info_cls = NULL;
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a local reply about info on all tunnels, pass info to the user.
+ *
+ * @param cls Closure (Cadet handle).
+ * @param message Message itself.
+ */
+static void
+handle_get_tunnels (void *cls,
+ const struct GNUNET_CADET_LocalInfoTunnel *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+
+ h->info_cb.tunnels_cb (h->info_cls,
+ &msg->destination,
+ ntohl (msg->channels),
+ ntohl (msg->connections),
+ ntohs (msg->estate),
+ ntohs (msg->cstate));
+
+}
+
+
+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param msg the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ * #GNUNET_SYSERR otherwise
+ */
+static int
+check_get_tunnel (void *cls,
+ const struct GNUNET_CADET_LocalInfoTunnel *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ unsigned int ch_n;
+ unsigned int c_n;
+ size_t esize;
+ size_t msize;
+
+ if (NULL == h->info_cb.tunnel_cb)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ " no handler for tunnel monitor message!\n");
+ goto clean_cls;
+ }
+
+ /* Verify message sanity */
+ msize = ntohs (msg->header.size);
+ esize = sizeof (struct GNUNET_CADET_LocalInfoTunnel);
+ if (esize > msize)
+ {
+ GNUNET_break_op (0);
+ h->info_cb.tunnel_cb (h->info_cls,
+ NULL, 0, 0, NULL, NULL, 0, 0);
+ goto clean_cls;
+ }
+ ch_n = ntohl (msg->channels);
+ c_n = ntohl (msg->connections);
+ esize += ch_n * sizeof (struct GNUNET_CADET_ChannelTunnelNumber);
+ esize += c_n * sizeof (struct GNUNET_CADET_ConnectionTunnelIdentifier);
+ if (msize != esize)
+ {
+ GNUNET_break_op (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "m:%u, e: %u (%u ch, %u conn)\n",
+ (unsigned int) msize,
+ (unsigned int) esize,
+ ch_n,
+ c_n);
+ h->info_cb.tunnel_cb (h->info_cls,
+ NULL, 0, 0, NULL, NULL, 0, 0);
+ goto clean_cls;
+ }
+
+ return GNUNET_OK;
+
+clean_cls:
+ h->info_cb.tunnel_cb = NULL;
+ h->info_cls = NULL;
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Process a local tunnel info reply, pass info to the user.
+ *
+ * @param cls Closure (Cadet handle).
+ * @param msg Message itself.
+ */
+static void
+handle_get_tunnel (void *cls,
+ const struct GNUNET_CADET_LocalInfoTunnel *msg)
+{
+ struct GNUNET_CADET_Handle *h = cls;
+ unsigned int ch_n;
+ unsigned int c_n;
+ const struct GNUNET_CADET_ConnectionTunnelIdentifier *conns;
+ const struct GNUNET_CADET_ChannelTunnelNumber *chns;
+
+ ch_n = ntohl (msg->channels);
+ c_n = ntohl (msg->connections);
+
+ /* Call Callback with tunnel info. */
+ conns = (const struct GNUNET_CADET_ConnectionTunnelIdentifier *) &msg[1];
+ chns = (const struct GNUNET_CADET_ChannelTunnelNumber *) &conns[c_n];
+ h->info_cb.tunnel_cb (h->info_cls,
+ &msg->destination,
+ ch_n,
+ c_n,
+ chns,
+ conns,
+ ntohs (msg->estate),
+ ntohs (msg->cstate));
+}
+
+
+/**
+ * Function called during #reconnect() to destroy
+ * all channels that are still open.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param cid chanenl ID
+ * @param value a `struct GNUNET_CADET_Channel` to destroy
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+destroy_channel_on_reconnect_cb (void *cls,
+ uint32_t cid,
+ void *value)
+{
+ /* struct GNUNET_CADET_Handle *handle = cls; */
+ struct GNUNET_CADET_Channel *ch = value;
+
+ destroy_channel (ch);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Reconnect to the service, retransmit all infomation to try to restore the
+ * original state.
+ *
+ * @param h handle to the cadet
+ */
+static void
+reconnect (struct GNUNET_CADET_Handle *h)
+{
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_fixed_size (channel_created,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE,
+ struct GNUNET_CADET_LocalChannelCreateMessage,
+ h),
+ GNUNET_MQ_hd_fixed_size (channel_destroy,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY,
+ struct GNUNET_CADET_LocalChannelDestroyMessage,
+ h),
+ GNUNET_MQ_hd_var_size (local_data,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
+ struct GNUNET_CADET_LocalData,
+ h),
+ GNUNET_MQ_hd_fixed_size (local_ack,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK,
+ struct GNUNET_CADET_LocalAck,
+ h),
+ GNUNET_MQ_hd_var_size (get_peers,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS,
+ struct GNUNET_CADET_LocalInfoPeer,
+ h),
+ GNUNET_MQ_hd_var_size (get_peer,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER,
+ struct GNUNET_CADET_LocalInfoPeer,
+ h),
+ GNUNET_MQ_hd_var_size (get_tunnels,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS,
+ struct GNUNET_CADET_LocalInfoTunnel,
+ h),
+ GNUNET_MQ_hd_var_size (get_tunnel,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL,
+ struct GNUNET_CADET_LocalInfoTunnel,
+ h),
+ GNUNET_MQ_handler_end ()
+ };
+
+ GNUNET_CONTAINER_multihashmap32_iterate (h->channels,
+ &destroy_channel_on_reconnect_cb,
+ h);
+ if (NULL != h->mq)
+ {
+ GNUNET_MQ_destroy (h->mq);
+ h->mq = NULL;
+ }
+ h->mq = GNUNET_CLIENT_connect (h->cfg,
+ "cadet",
+ handlers,
+ &handle_mq_error,
+ h);
+ if (NULL == h->mq)
+ {
+ schedule_reconnect (h);
+ return;
+ }
+ h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
+}
+
+
+/**
+ * Function called during #GNUNET_CADET_disconnect() to destroy
+ * all channels that are still open.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param cid chanenl ID
+ * @param value a `struct GNUNET_CADET_Channel` to destroy
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+destroy_channel_cb (void *cls,
+ uint32_t cid,
+ void *value)
+{
+ /* struct GNUNET_CADET_Handle *handle = cls; */
+ struct GNUNET_CADET_Channel *ch = value;
+
+ if (ntohl (ch->ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
+ {
+ GNUNET_break (0);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "channel %X not destroyed\n",
+ ntohl (ch->ccn.channel_of_client));
+ }
+ destroy_channel (ch);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called during #GNUNET_CADET_disconnect() to destroy
+ * all ports that are still open.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param id port ID
+ * @param value a `struct GNUNET_CADET_Channel` to destroy
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+destroy_port_cb (void *cls,
+ const struct GNUNET_HashCode *id,
+ void *value)
+{
+ /* struct GNUNET_CADET_Handle *handle = cls; */
+ struct GNUNET_CADET_Port *port = value;
+
+ GNUNET_break (0);
+ GNUNET_CADET_close_port (port);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Disconnect from the cadet service. All channels will be destroyed. All channel
+ * disconnect callbacks will be called on any still connected peers, notifying
+ * about their disconnection. The registered inbound channel cleaner will be
+ * called should any inbound channels still exist.
+ *
+ * @param handle connection to cadet to disconnect
+ */
+void
+GNUNET_CADET_disconnect (struct GNUNET_CADET_Handle *handle)
+{
+ GNUNET_CONTAINER_multihashmap_iterate (handle->ports,
+ &destroy_port_cb,
+ handle);
+ GNUNET_CONTAINER_multihashmap_destroy (handle->ports);
+ handle->ports = NULL;
+ GNUNET_CONTAINER_multihashmap32_iterate (handle->channels,
+ &destroy_channel_cb,
+ handle);
+ GNUNET_CONTAINER_multihashmap32_destroy (handle->channels);
+ handle->channels = NULL;
+ if (NULL != handle->mq)
+ {
+ GNUNET_MQ_destroy (handle->mq);
+ handle->mq = NULL;
+ }
+ if (NULL != handle->reconnect_task)
+ {
+ GNUNET_SCHEDULER_cancel (handle->reconnect_task);
+ handle->reconnect_task = NULL;
+ }
+ GNUNET_free (handle);
+}
+
+
+/**
+ * Close a port opened with @a GNUNET_CADET_open_port().
+ * The @a new_channel callback will no longer be called.
+ *
+ * @param p Port handle.
+ */
+void
+GNUNET_CADET_close_port (struct GNUNET_CADET_Port *p)
+{
+ struct GNUNET_CADET_PortMessage *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_CLOSE);
+ msg->port = p->id;
+ GNUNET_MQ_send (p->cadet->mq,
+ env);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (p->cadet->ports,
+ &p->id,
+ p));
+ GNUNET_free (p);
+}
+
+
+/**
+ * Destroy an existing channel.
+ *
+ * The existing end callback for the channel will be called immediately.
+ * Any pending outgoing messages will be sent but no incoming messages will be
+ * accepted and no data callbacks will be called.
+ *
+ * @param channel Channel handle, becomes invalid after this call.
+ */
+void
+GNUNET_CADET_channel_destroy (struct GNUNET_CADET_Channel *channel)
+{
+ struct GNUNET_CADET_Handle *h = channel->cadet;
+ struct GNUNET_CADET_LocalChannelDestroyMessage *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
+ msg->ccn = channel->ccn;
+ GNUNET_MQ_send (h->mq,
+ env);
+ destroy_channel (channel);
+}
+
+
+/**
+ * Get information about a channel.
+ *
+ * @param channel Channel handle.
+ * @param option Query (GNUNET_CADET_OPTION_*).
+ * @param ... dependant on option, currently not used
+ *
+ * @return Union with an answer to the query.
+ */
+const union GNUNET_CADET_ChannelInfo *
+GNUNET_CADET_channel_get_info (struct GNUNET_CADET_Channel *channel,
+ enum GNUNET_CADET_ChannelOption option,
+ ...)
+{
+ static int bool_flag;
+
+ switch (option)
+ {
+ case GNUNET_CADET_OPTION_NOBUFFER:
+ case GNUNET_CADET_OPTION_RELIABLE:
+ case GNUNET_CADET_OPTION_OUT_OF_ORDER:
+ if (0 != (option & channel->options))
+ bool_flag = GNUNET_YES;
+ else
+ bool_flag = GNUNET_NO;
+ return (const union GNUNET_CADET_ChannelInfo *) &bool_flag;
+ break;
+ case GNUNET_CADET_OPTION_PEER:
+ return (const union GNUNET_CADET_ChannelInfo *) &channel->peer;
+ break;
+ default:
+ GNUNET_break (0);
+ return NULL;
+ }
+}
+
+
+/**
+ * Send an ack on the channel to confirm the processing of a message.
+ *
+ * @param ch Channel on which to send the ACK.
+ */
+void
+GNUNET_CADET_receive_done (struct GNUNET_CADET_Channel *channel)
+{
+ struct GNUNET_CADET_LocalAck *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending ACK on channel %X\n",
+ ntohl (channel->ccn.channel_of_client));
+ msg->ccn = channel->ccn;
+ GNUNET_MQ_send (channel->cadet->mq,
+ env);
+}
+
+
+/**
+ * Send message of @a type to CADET service of @a h
+ *
+ * @param h handle to CADET service
+ * @param type message type of trivial information request to send
+ */
+static void
+send_info_request (struct GNUNET_CADET_Handle *h,
+ uint16_t type)
+{
+ struct GNUNET_MessageHeader *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ env = GNUNET_MQ_msg (msg,
+ type);
+ GNUNET_MQ_send (h->mq,
+ env);
+}
+
+
+/**
+ * Request a debug dump on the service's STDERR.
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h cadet handle
+ */
+void
+GNUNET_CADET_request_dump (struct GNUNET_CADET_Handle *h)
+{
+ send_info_request (h,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_DUMP);
+}
+
+
+/**
+ * Request information about peers known to the running cadet service.
+ * The callback will be called for every peer known to the service.
+ * Only one info request (of any kind) can be active at once.
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Handle to the cadet peer.
+ * @param callback Function to call with the requested data.
+ * @param callback_cls Closure for @c callback.
+ * @return #GNUNET_OK / #GNUNET_SYSERR
+ */
+int
+GNUNET_CADET_get_peers (struct GNUNET_CADET_Handle *h,
+ GNUNET_CADET_PeersCB callback,
+ void *callback_cls)
+{
+ if (NULL != h->info_cb.peers_cb)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ send_info_request (h,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
+ h->info_cb.peers_cb = callback;
+ h->info_cls = callback_cls;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Cancel a peer info request. The callback will not be called (anymore).
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Cadet handle.
+ * @return Closure given to GNUNET_CADET_get_peers().
+ */
+void *
+GNUNET_CADET_get_peers_cancel (struct GNUNET_CADET_Handle *h)
+{
+ void *cls = h->info_cls;
+
+ h->info_cb.peers_cb = NULL;
+ h->info_cls = NULL;
+ return cls;
+}
+
+
+/**
+ * Request information about a peer known to the running cadet peer.
+ * The callback will be called for the tunnel once.
+ * Only one info request (of any kind) can be active at once.
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Handle to the cadet peer.
+ * @param id Peer whose tunnel to examine.
+ * @param callback Function to call with the requested data.
+ * @param callback_cls Closure for @c callback.
+ * @return #GNUNET_OK / #GNUNET_SYSERR
+ */
+int
+GNUNET_CADET_get_peer (struct GNUNET_CADET_Handle *h,
+ const struct GNUNET_PeerIdentity *id,
+ GNUNET_CADET_PeerCB callback,
+ void *callback_cls)
+{
+ struct GNUNET_CADET_LocalInfo *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ if (NULL != h->info_cb.peer_cb)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER);
+ msg->peer = *id;
+ GNUNET_MQ_send (h->mq,
+ env);
+ h->info_cb.peer_cb = callback;
+ h->info_cls = callback_cls;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Request information about tunnels of the running cadet peer.
+ * The callback will be called for every tunnel of the service.
+ * Only one info request (of any kind) can be active at once.
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Handle to the cadet peer.
+ * @param callback Function to call with the requested data.
+ * @param callback_cls Closure for @c callback.
+ * @return #GNUNET_OK / #GNUNET_SYSERR
+ */
+int
+GNUNET_CADET_get_tunnels (struct GNUNET_CADET_Handle *h,
+ GNUNET_CADET_TunnelsCB callback,
+ void *callback_cls)
+{
+ if (NULL != h->info_cb.tunnels_cb)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ send_info_request (h,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
+ h->info_cb.tunnels_cb = callback;
+ h->info_cls = callback_cls;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Cancel a monitor request. The monitor callback will not be called.
+ *
+ * @param h Cadet handle.
+ * @return Closure given to GNUNET_CADET_get_tunnels().
+ */
+void *
+GNUNET_CADET_get_tunnels_cancel (struct GNUNET_CADET_Handle *h)
+{
+ void *cls = h->info_cls;
+
+ h->info_cb.tunnels_cb = NULL;
+ h->info_cls = NULL;
+ return cls;
+}
+
+
+/**
+ * Request information about a tunnel of the running cadet peer.
+ * The callback will be called for the tunnel once.
+ * Only one info request (of any kind) can be active at once.
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Handle to the cadet peer.
+ * @param id Peer whose tunnel to examine.
+ * @param callback Function to call with the requested data.
+ * @param callback_cls Closure for @c callback.
+ * @return #GNUNET_OK / #GNUNET_SYSERR
+ */
+int
+GNUNET_CADET_get_tunnel (struct GNUNET_CADET_Handle *h,
+ const struct GNUNET_PeerIdentity *id,
+ GNUNET_CADET_TunnelCB callback,
+ void *callback_cls)
+{
+ struct GNUNET_CADET_LocalInfo *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ if (NULL != h->info_cb.tunnel_cb)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL);
+ msg->peer = *id;
+ GNUNET_MQ_send (h->mq,
+ env);
+ h->info_cb.tunnel_cb = callback;
+ h->info_cls = callback_cls;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Transitional function to convert an unsigned int port to a hash value.
+ * WARNING: local static value returned, NOT reentrant!
+ * WARNING: do not use this function for new code!
+ *
+ * @param port Numerical port (unsigned int format).
+ *
+ * @return A GNUNET_HashCode usable for the new CADET API.
+ */
+const struct GNUNET_HashCode *
+GC_u2h (uint32_t port)
+{
+ static struct GNUNET_HashCode hash;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "This is a transitional function, use proper crypto hashes as CADET ports\n");
+ GNUNET_CRYPTO_hash (&port,
+ sizeof (port),
+ &hash);
+ return &hash;
+}
+
+
+/**
+ * Connect to the MQ-based cadet service.
+ *
+ * @param cfg Configuration to use.
+ *
+ * @return Handle to the cadet service NULL on error.
+ */
+struct GNUNET_CADET_Handle *
+GNUNET_CADET_connecT (const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+ struct GNUNET_CADET_Handle *h;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GNUNET_CADET_connecT()\n");
+ h = GNUNET_new (struct GNUNET_CADET_Handle);
+ h->cfg = cfg;
+ h->ports = GNUNET_CONTAINER_multihashmap_create (4,
+ GNUNET_YES);
+ h->channels = GNUNET_CONTAINER_multihashmap32_create (4);
+ reconnect (h);
+ if (NULL == h->mq)
+ {
+ GNUNET_break (0);
+ GNUNET_CADET_disconnect (h);
+ return NULL;
+ }
+ h->next_ccn.channel_of_client = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
+ h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
+ h->reconnect_task = NULL;
+
+ return h;
+}
+
+
+/**
+ * Open a port to receive incomming MQ-based channels.
+ *
+ * @param h CADET handle.
+ * @param port Hash identifying the port.
+ * @param connects Function called when an incoming channel is connected.
+ * @param connects_cls Closure for the @a connects handler.
+ * @param window_changes Function called when the transmit window size changes.
+ * @param disconnects Function called when a channel is disconnected.
+ * @param handlers Callbacks for messages we care about, NULL-terminated.
+ * @return Port handle.
+ */
+struct GNUNET_CADET_Port *
+GNUNET_CADET_open_porT (struct GNUNET_CADET_Handle *h,
+ const struct GNUNET_HashCode *port,
+ GNUNET_CADET_ConnectEventHandler connects,
+ void * connects_cls,
+ GNUNET_CADET_WindowSizeEventHandler window_changes,
+ GNUNET_CADET_DisconnectEventHandler disconnects,
+ const struct GNUNET_MQ_MessageHandler *handlers)
+{
+ struct GNUNET_CADET_PortMessage *msg;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_CADET_Port *p;
+
+ GNUNET_assert (NULL != connects);
+ GNUNET_assert (NULL != disconnects);
+
+ p = GNUNET_new (struct GNUNET_CADET_Port);
+ p->cadet = h;
+ p->id = *port;
+ p->connects = connects;
+ p->cls = connects_cls;
+ p->window_changes = window_changes;
+ p->disconnects = disconnects;
+ if (NULL != handlers)
+ {
+ unsigned int i;
+
+ for (i=0;NULL != handlers[i].cb; i++) ;
+ p->handlers = GNUNET_new_array (i + 1,
+ struct GNUNET_MQ_MessageHandler);
+ GNUNET_memcpy ((struct GNUNET_MQ_MessageHandler *) p->handlers,
+ handlers,
+ i * sizeof (struct GNUNET_MQ_MessageHandler));
+ }
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (h->ports,
+ &p->id,
+ p,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_OPEN);
+ msg->port = p->id;
+ GNUNET_MQ_send (h->mq,
+ env);
+ return p;
+}
+
+
+/**
+ * Create a new channel towards a remote peer.
+ *
+ * If the destination port is not open by any peer or the destination peer
+ * does not accept the channel, #GNUNET_CADET_ChannelEndHandler will be called
+ * for this channel.
+ *
+ * @param h CADET handle.
+ * @param channel_cls Closure for the channel. It's given to:
+ * - The disconnect handler @a disconnects
+ * - Each message type callback in @a handlers
+ * @param destination Peer identity the channel should go to.
+ * @param port Identification of the destination port.
+ * @param options CadetOption flag field, with all desired option bits set to 1.
+ * @param window_changes Function called when the transmit window size changes.
+ * @param disconnects Function called when the channel is disconnected.
+ * @param handlers Callbacks for messages we care about, NULL-terminated.
+ * @return Handle to the channel.
+ */
+struct GNUNET_CADET_Channel *
+GNUNET_CADET_channel_creatE (struct GNUNET_CADET_Handle *h,
+ void *channel_cls,
+ const struct GNUNET_PeerIdentity *destination,
+ const struct GNUNET_HashCode *port,
+ enum GNUNET_CADET_ChannelOption options,
+ GNUNET_CADET_WindowSizeEventHandler window_changes,
+ GNUNET_CADET_DisconnectEventHandler disconnects,
+ const struct GNUNET_MQ_MessageHandler *handlers)
+{
+ struct GNUNET_CADET_Channel *ch;
+ struct GNUNET_CADET_LocalChannelCreateMessage *msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ GNUNET_assert (NULL != disconnects);
+ ch = create_channel (h,
+ NULL);
+ ch->ctx = channel_cls;
+ ch->peer = *destination;
+ ch->options = options;
+ ch->window_changes = window_changes;
+ ch->disconnects = disconnects;
+
+ /* Create MQ for channel */
+ ch->mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl,
+ &cadet_mq_destroy_impl,
+ &cadet_mq_cancel_impl,
+ ch,
+ handlers,
+ &cadet_mq_error_handler,
+ ch);
+ GNUNET_MQ_set_handlers_closure (ch->mq, channel_cls);
+
+ /* Request channel creation to service */
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE);
+ msg->ccn = ch->ccn;
+ msg->port = *port;
+ msg->peer = *destination;
+ msg->opt = htonl (options);
+ GNUNET_MQ_send (h->mq,
+ env);
+ return ch;
+}
+
+
+/**
+ * Obtain the message queue for a connected peer.
+ *
+ * @param channel The channel handle from which to get the MQ.
+ *
+ * @return NULL if @a channel is not yet connected.
+ */
+struct GNUNET_MQ_Handle *
+GNUNET_CADET_get_mq (const struct GNUNET_CADET_Channel *channel)
+{
+ return channel->mq;
+}
+
+/* end of cadet_api.c */
projects / oweals / gnunet.git / commitdiff