transmission/libtransmission/port-forwarding.c

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/*
* This file Copyright (C) 2008-2009 Charles Kerr <charles@transmissionbt.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
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#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
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#include "transmission.h"
#include "natpmp.h"
#include "net.h"
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#include "peer-io.h"
#include "peer-mgr.h"
#include "port-forwarding.h"
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#include "session.h"
#include "torrent.h"
#include "trevent.h"
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#include "upnp.h"
#include "utils.h"
static const char *
getKey( void ) { return _( "Port Forwarding" ); }
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struct tr_shared
{
tr_bool isEnabled;
tr_bool isShuttingDown;
tr_bool doPortCheck;
tr_port_forwarding natpmpStatus;
tr_port_forwarding upnpStatus;
tr_upnp * upnp;
tr_natpmp * natpmp;
tr_session * session;
struct event * timer;
};
/***
****
***/
static const char*
getNatStateStr( int state )
{
switch( state )
{
case TR_PORT_MAPPING: return _( "Starting" );
case TR_PORT_MAPPED: return _( "Forwarded" );
case TR_PORT_UNMAPPING: return _( "Stopping" );
case TR_PORT_UNMAPPED: return _( "Not forwarded" );
default: return "???";
}
}
static void
natPulse( tr_shared * s, tr_bool doPortCheck )
{
const tr_port port = s->session->peerPort;
const int isEnabled = s->isEnabled && !s->isShuttingDown;
int oldStatus;
int newStatus;
if( s->natpmp == NULL )
s->natpmp = tr_natpmpInit( );
if( s->upnp == NULL )
s->upnp = tr_upnpInit( );
oldStatus = tr_sharedTraversalStatus( s );
s->natpmpStatus = tr_natpmpPulse( s->natpmp, port, isEnabled );
s->upnpStatus = tr_upnpPulse( s->upnp, port, isEnabled, doPortCheck );
newStatus = tr_sharedTraversalStatus( s );
if( newStatus != oldStatus )
tr_ninf( getKey( ), _( "State changed from \"%1$s\" to \"%2$s\"" ),
getNatStateStr( oldStatus ),
getNatStateStr( newStatus ) );
}
static void
onTimer( int fd UNUSED, short what UNUSED, void * vshared )
{
int sec=0, msec=0;
tr_shared * s = vshared;
assert( s );
assert( s->timer );
/* do something */
natPulse( s, s->doPortCheck );
s->doPortCheck = FALSE;
/* when to wake up again */
switch( tr_sharedTraversalStatus( s ) )
{
case TR_PORT_MAPPED:
/* if we're mapped, everything is fine... check back in 20 minutes
* to renew the port forwarding if it's expired */
s->doPortCheck = TRUE;
sec = 60 * 20;
break;
case TR_PORT_ERROR:
/* some kind of an error. wait 60 seconds and retry */
sec = 60;
break;
default:
/* in progress. pulse frequently. */
msec = 333000;
break;
}
tr_timerAdd( s->timer, sec, msec );
}
/***
****
***/
tr_shared *
tr_sharedInit( tr_session * session, tr_bool isEnabled )
{
tr_shared * s = tr_new0( tr_shared, 1 );
s->session = session;
s->isEnabled = isEnabled;
s->upnpStatus = TR_PORT_UNMAPPED;
s->natpmpStatus = TR_PORT_UNMAPPED;
if( isEnabled )
{
s->timer = tr_new0( struct event, 1 );
evtimer_set( s->timer, onTimer, s );
tr_timerAdd( s->timer, 0, 333000 );
}
return s;
}
static void
stop_timer( tr_shared * s )
{
if( s->timer != NULL )
{
evtimer_del( s->timer );
tr_free( s->timer );
s->timer = NULL;
}
}
static void
stop_forwarding( tr_shared * s )
{
tr_ninf( getKey( ), "%s", _( "Stopped" ) );
natPulse( s, FALSE );
tr_natpmpClose( s->natpmp );
s->natpmp = NULL;
tr_upnpClose( s->upnp );
s->upnp = NULL;
stop_timer( s );
}
void
tr_sharedClose( tr_session * session )
{
tr_shared * s = session->shared;
s->isShuttingDown = TRUE;
stop_forwarding( s );
s->session->shared = NULL;
tr_free( s );
}
static void
start_timer( tr_shared * s )
{
s->timer = tr_new0( struct event, 1 );
evtimer_set( s->timer, onTimer, s );
onTimer( 0, 0, s );
}
void
tr_sharedTraversalEnable( tr_shared * s, tr_bool isEnabled )
{
if(( s->isEnabled = isEnabled ))
start_timer( s );
else
stop_forwarding( s );
}
void
tr_sharedPortChanged( tr_session * session )
{
tr_shared * s = session->shared;
if( s->isEnabled )
{
stop_timer( s );
start_timer( s );
}
}
tr_bool
tr_sharedTraversalIsEnabled( const tr_shared * s )
{
return s->isEnabled;
}
int
tr_sharedTraversalStatus( const tr_shared * s )
{
return MAX( s->natpmpStatus, s->upnpStatus );
}