123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240 |
- /*
- This file is part of GNUnet.
- Copyright (C) 2011, 2017, 2019 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- 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
- Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file cadet/cadet_api_list_tunnels.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"
- /**
- * Operation handle.
- */
- struct GNUNET_CADET_ListTunnels
- {
- /**
- * Monitor callback
- */
- GNUNET_CADET_TunnelsCB tunnels_cb;
- /**
- * Info callback closure for @c tunnels_cb.
- */
- void *tunnels_cb_cls;
-
- /**
- * Message queue to talk to CADET service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Configuration we use.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Task to reconnect.
- */
- struct GNUNET_SCHEDULER_Task *reconnect_task;
- /**
- * Backoff for reconnect attempts.
- */
- struct GNUNET_TIME_Relative backoff;
- };
- /**
- * Process a local reply about info on all tunnels, pass info to the user.
- *
- * @param cls a `struct GNUNET_CADET_ListTunnels *`
- * @param info Message itself.
- */
- static void
- handle_get_tunnels (void *cls,
- const struct GNUNET_CADET_LocalInfoTunnel *info)
- {
- struct GNUNET_CADET_ListTunnels *lt = cls;
- struct GNUNET_CADET_TunnelDetails td;
-
- td.peer = info->destination;
- td.channels = ntohl (info->channels);
- td.connections = ntohl (info->connections);
- td.estate = ntohs (info->estate);
- td.cstate = ntohs (info->cstate);
- lt->tunnels_cb (lt->tunnels_cb_cls,
- &td);
- }
- /**
- * Process a local reply about info on all tunnels, pass info to the user.
- *
- * @param cls a `struct GNUNET_CADET_ListTunnels *`
- * @param message Message itself.
- */
- static void
- handle_get_tunnels_end (void *cls,
- const struct GNUNET_MessageHeader *msg)
- {
- struct GNUNET_CADET_ListTunnels *lt = cls;
- (void) msg;
-
- lt->tunnels_cb (lt->tunnels_cb_cls,
- NULL);
- GNUNET_CADET_list_tunnels_cancel (lt);
- }
- /**
- * Reconnect to the service and try again.
- *
- * @param cls a `struct GNUNET_CADET_ListTunnels` operation
- */
- static void
- reconnect (void *cls);
- /**
- * Function called on connection trouble. Reconnects.
- *
- * @param cls a `struct GNUNET_CADET_ListTunnels`
- * @param error error code from MQ
- */
- static void
- error_handler (void *cls,
- enum GNUNET_MQ_Error error)
- {
- struct GNUNET_CADET_ListTunnels *lt = cls;
- GNUNET_MQ_destroy (lt->mq);
- lt->mq = NULL;
- lt->backoff = GNUNET_TIME_randomized_backoff (lt->backoff,
- GNUNET_TIME_UNIT_MINUTES);
- lt->reconnect_task = GNUNET_SCHEDULER_add_delayed (lt->backoff,
- &reconnect,
- lt);
- }
- /**
- * Reconnect to the service and try again.
- *
- * @param cls a `struct GNUNET_CADET_ListTunnels` operation
- */
- static void
- reconnect (void *cls)
- {
- struct GNUNET_CADET_ListTunnels *lt = cls;
- struct GNUNET_MQ_MessageHandler handlers[] = {
- GNUNET_MQ_hd_fixed_size (get_tunnels,
- GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS,
- struct GNUNET_CADET_LocalInfoTunnel,
- lt),
- GNUNET_MQ_hd_fixed_size (get_tunnels_end,
- GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS_END,
- struct GNUNET_MessageHeader,
- lt),
- GNUNET_MQ_handler_end ()
- };
- struct GNUNET_MessageHeader *msg;
- struct GNUNET_MQ_Envelope *env;
- lt->reconnect_task = NULL;
- lt->mq = GNUNET_CLIENT_connect (lt->cfg,
- "cadet",
- handlers,
- &error_handler,
- lt);
- if (NULL == lt->mq)
- return;
- env = GNUNET_MQ_msg (msg,
- GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_TUNNELS);
- GNUNET_MQ_send (lt->mq,
- env);
- }
- /**
- * 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.
- *
- * @param cfg configuration to use
- * @param callback Function to call with the requested data.
- * @param callback_cls Closure for @c callback.
- * @return NULL on error
- */
- struct GNUNET_CADET_ListTunnels *
- GNUNET_CADET_list_tunnels (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_CADET_TunnelsCB callback,
- void *callback_cls)
- {
- struct GNUNET_CADET_ListTunnels *lt;
- if (NULL == callback)
- {
- GNUNET_break (0);
- return NULL;
- }
- lt = GNUNET_new (struct GNUNET_CADET_ListTunnels);
- lt->tunnels_cb = callback;
- lt->tunnels_cb_cls = callback_cls;
- lt->cfg = cfg;
- reconnect (lt);
- if (NULL == lt->mq)
- {
- GNUNET_free (lt);
- return NULL;
- }
- return lt;
- }
- /**
- * Cancel a monitor request. The monitor callback will not be called.
- *
- * @param lt operation handle
- * @return Closure given to GNUNET_CADET_list_tunnels().
- */
- void *
- GNUNET_CADET_list_tunnels_cancel (struct GNUNET_CADET_ListTunnels *lt)
- {
- void *ret = lt->tunnels_cb_cls;
- if (NULL != lt->mq)
- GNUNET_MQ_destroy (lt->mq);
- if (NULL != lt->reconnect_task)
- GNUNET_SCHEDULER_cancel (lt->reconnect_task);
- GNUNET_free (lt);
- return ret;
- }
- /* end of cadet_api_list_tunnels.c */
|