transmission/libtransmission/port-forwarding.c

239 lines
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/******************************************************************************
* $Id$
*
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* Copyright (c) 2005-2008 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
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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"
#include "peer-mgr.h"
#include "port-forwarding.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
{
unsigned int isEnabled : 1;
unsigned int isShuttingDown : 1;
tr_port_forwarding natpmpStatus;
tr_port_forwarding upnpStatus;
int bindPort;
int bindSocket;
int publicPort;
tr_handle * h;
tr_timer * pulseTimer;
tr_upnp * upnp;
tr_natpmp * natpmp;
};
/***
****
***/
static const char*
getNatStateStr( int state )
{
switch( state )
{
/* we're in the process of trying to set up port forwarding */
case TR_PORT_MAPPING: return _( "Starting" );
/* we've successfully forwarded the port */
case TR_PORT_MAPPED: return _( "Forwarded" );
/* we're cancelling the port forwarding */
case TR_PORT_UNMAPPING: return _( "Stopping" );
/* the port isn't forwarded */
case TR_PORT_UNMAPPED: return _( "Not forwarded" );
case TR_PORT_ERROR: return "???";
}
return "notfound";
}
static void
natPulse( tr_shared * s )
{
const int port = s->publicPort;
const int isEnabled = s->isEnabled && !s->isShuttingDown;
int oldStatus;
int newStatus;
oldStatus = tr_sharedTraversalStatus( s );
s->natpmpStatus = tr_natpmpPulse( s->natpmp, port, isEnabled );
s->upnpStatus = tr_upnpPulse( s->upnp, port, isEnabled );
newStatus = tr_sharedTraversalStatus( s );
if( newStatus != oldStatus )
tr_ninf( getKey(), _( "State changed from \"%s\" to \"%s\"" ),
getNatStateStr(oldStatus),
getNatStateStr(newStatus) );
}
static void
incomingPeersPulse( tr_shared * s )
{
if( s->bindSocket >= 0 && ( s->bindPort != s->publicPort ) )
{
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tr_ninf( getKey(), _( "Closing port %d" ), s->bindPort );
tr_netClose( s->bindSocket );
s->bindSocket = -1;
}
if( ( s->publicPort > 0 ) && ( s->bindPort != s->publicPort ) )
{
int socket;
errno = 0;
socket = tr_netBindTCP( s->publicPort );
if( socket >= 0 ) {
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tr_ninf( getKey(), _( "Opened port %d to listen for incoming peer connections" ), s->publicPort );
s->bindPort = s->publicPort;
s->bindSocket = socket;
listen( s->bindSocket, 5 );
} else {
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tr_nerr( getKey(), _( "Couldn't open port %d to listen for incoming peer connections (errno %d - %s)" ),
s->publicPort, errno, tr_strerror(errno) );
s->bindPort = -1;
s->bindSocket = -1;
}
}
for( ;; ) /* check for new incoming peer connections */
{
int socket;
uint16_t port;
struct in_addr addr;
if( s->bindSocket < 0 )
break;
socket = tr_netAccept( s->bindSocket, &addr, &port );
if( socket < 0 )
break;
tr_peerMgrAddIncoming( s->h->peerMgr, &addr, port, socket );
}
}
static int
sharedPulse( void * vshared )
{
int keepPulsing = 1;
tr_shared * shared = vshared;
natPulse( shared );
if( !shared->isShuttingDown )
{
incomingPeersPulse( shared );
}
else
{
tr_ninf( getKey(), _( "Stopped" ) );
tr_timerFree( &shared->pulseTimer );
tr_netClose( shared->bindSocket );
tr_natpmpClose( shared->natpmp );
tr_upnpClose( shared->upnp );
shared->h->shared = NULL;
tr_free( shared );
keepPulsing = 0;
}
return keepPulsing;
}
/***
****
***/
tr_shared *
tr_sharedInit( tr_handle * h, int isEnabled, int publicPort )
{
tr_shared * s = tr_new0( tr_shared, 1 );
s->h = h;
s->publicPort = publicPort;
s->bindPort = -1;
s->bindSocket = -1;
s->natpmp = tr_natpmpInit();
s->upnp = tr_upnpInit();
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s->pulseTimer = tr_timerNew( h, sharedPulse, s, 1000 );
s->isEnabled = isEnabled ? 1 : 0;
s->upnpStatus = TR_PORT_UNMAPPED;
s->natpmpStatus = TR_PORT_UNMAPPED;
return s;
}
void
tr_sharedShuttingDown( tr_shared * s )
{
s->isShuttingDown = 1;
}
void
tr_sharedSetPort( tr_shared * s, int port )
{
tr_torrent * tor = NULL;
s->publicPort = port;
while(( tor = tr_torrentNext( s->h, tor )))
tr_torrentChangeMyPort( tor );
}
int
tr_sharedGetPeerPort( const tr_shared * s )
{
return s->publicPort;
}
void
tr_sharedTraversalEnable( tr_shared * s, int isEnabled )
{
s->isEnabled = isEnabled;
}
int
tr_sharedTraversalIsEnabled( const tr_shared * s )
{
return s->isEnabled;
}
int
tr_sharedTraversalStatus( const tr_shared * s )
{
return MAX( s->natpmpStatus, s->upnpStatus );
}