tor-android/external/badvpn_dns/flowextra/KeepaliveIO.c

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2015-01-25 11:08:34 +00:00
/**
* @file KeepaliveIO.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <misc/debug.h>
#include "KeepaliveIO.h"
static void keepalive_handler (KeepaliveIO *o)
{
DebugObject_Access(&o->d_obj);
PacketRecvBlocker_AllowBlockedPacket(&o->ka_blocker);
}
int KeepaliveIO_Init (KeepaliveIO *o, BReactor *reactor, PacketPassInterface *output, PacketRecvInterface *keepalive_input, btime_t keepalive_interval_ms)
{
ASSERT(PacketRecvInterface_GetMTU(keepalive_input) <= PacketPassInterface_GetMTU(output))
ASSERT(keepalive_interval_ms > 0)
// set arguments
o->reactor = reactor;
// init keep-alive sender
PacketPassInactivityMonitor_Init(&o->kasender, output, o->reactor, keepalive_interval_ms, (PacketPassInactivityMonitor_handler)keepalive_handler, o);
// init queue
PacketPassPriorityQueue_Init(&o->queue, PacketPassInactivityMonitor_GetInput(&o->kasender), BReactor_PendingGroup(o->reactor), 0);
// init keepalive flow
PacketPassPriorityQueueFlow_Init(&o->ka_qflow, &o->queue, -1);
// init keepalive blocker
PacketRecvBlocker_Init(&o->ka_blocker, keepalive_input, BReactor_PendingGroup(reactor));
// init keepalive buffer
if (!SinglePacketBuffer_Init(&o->ka_buffer, PacketRecvBlocker_GetOutput(&o->ka_blocker), PacketPassPriorityQueueFlow_GetInput(&o->ka_qflow), BReactor_PendingGroup(o->reactor))) {
goto fail1;
}
// init user flow
PacketPassPriorityQueueFlow_Init(&o->user_qflow, &o->queue, 0);
DebugObject_Init(&o->d_obj);
return 1;
fail1:
PacketRecvBlocker_Free(&o->ka_blocker);
PacketPassPriorityQueueFlow_Free(&o->ka_qflow);
PacketPassPriorityQueue_Free(&o->queue);
PacketPassInactivityMonitor_Free(&o->kasender);
return 0;
}
void KeepaliveIO_Free (KeepaliveIO *o)
{
DebugObject_Free(&o->d_obj);
// allow freeing queue flows
PacketPassPriorityQueue_PrepareFree(&o->queue);
// free user flow
PacketPassPriorityQueueFlow_Free(&o->user_qflow);
// free keepalive buffer
SinglePacketBuffer_Free(&o->ka_buffer);
// free keepalive blocker
PacketRecvBlocker_Free(&o->ka_blocker);
// free keepalive flow
PacketPassPriorityQueueFlow_Free(&o->ka_qflow);
// free queue
PacketPassPriorityQueue_Free(&o->queue);
// free keep-alive sender
PacketPassInactivityMonitor_Free(&o->kasender);
}
PacketPassInterface * KeepaliveIO_GetInput (KeepaliveIO *o)
{
DebugObject_Access(&o->d_obj);
return PacketPassPriorityQueueFlow_GetInput(&o->user_qflow);
}