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/*
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 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;
};
/**
* 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);
}
/**
* 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_tunnels (void *cls,
const struct GNUNET_MessageHeader *message)
{
size_t esize;
(void) cls;
esize = ntohs (message->size);
if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) == esize)
return GNUNET_OK;
if (sizeof (struct GNUNET_MessageHeader) == esize)
return GNUNET_OK;
return GNUNET_SYSERR;
}
/**
* 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_MessageHeader *msg)
{
struct GNUNET_CADET_Handle *h = cls;
const struct GNUNET_CADET_LocalInfoTunnel *info =
(const struct GNUNET_CADET_LocalInfoTunnel *) msg;
if (NULL == h->info_cb.tunnels_cb)
return;
if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) == ntohs (msg->size))
h->info_cb.tunnels_cb (h->info_cls,
&info->destination,
ntohl (info->channels),
ntohl (info->connections),
ntohs (info->estate),
ntohs (info->cstate));
else
h->info_cb.tunnels_cb (h->info_cls,
NULL,
0,
0,
0,
0);
}
static void
reconnect (void *cls)
{
struct GNUNET_CADET_ListTunnels *lt = cls;
struct GNUNET_MQ_MessageHandler *handlers[] = {
GNUNET_MQ_hd_var_size (get_tunnels,
GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS,
struct GNUNET_MessageHeader,
h),
GNUNET_MQ_handler_end ()
}
struct GNUNET_MessageHeader *msg;
struct GNUNET_MQ_Envelope *env;
cm->mq = GNUNET_CLIENT_connect (cm->cfg,
"cadet",
handlers,
&error_handler,
cm);
env = GNUNET_MQ_msg (msg,
type);
GNUNET_MQ_send (cm->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.
*
* 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
*/
struct GNUNET_CADET_ListTunnels *
GNUNET_CADET_list_tunnels (const struct GNUNET_CONFIGURATION_Handle *cfg,
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_list_tunnels().
*/
void *
GNUNET_CADET_list_tunnels_cancel (struct GNUNET_CADET_ListTunnels *lt)
{
void *cls = h->info_cls;
h->info_cb.tunnels_cb = NULL;
h->info_cls = NULL;
return cls;
}
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