transmission/libtransmission/shared.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2007 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.
*****************************************************************************/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
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#include "transmission.h"
#include "handshake.h"
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#include "natpmp.h"
#include "net.h"
#include "peer-io.h"
#include "peer-mgr.h"
#include "platform.h"
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#include "shared.h"
#include "trevent.h"
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#include "upnp.h"
#include "utils.h"
struct tr_shared
{
tr_handle * h;
tr_lock * lock;
tr_timer * pulseTimer;
/* Incoming connections */
int publicPort;
int bindPort;
int bindSocket;
/* NAT-PMP/UPnP */
tr_natpmp_t * natpmp;
tr_upnp_t * upnp;
};
/***********************************************************************
* Local prototypes
**********************************************************************/
static int SharedLoop( void * );
static void SetPublicPort( tr_shared *, int );
static void AcceptPeers( tr_shared * );
/***********************************************************************
* tr_sharedInit
***********************************************************************
*
**********************************************************************/
tr_shared * tr_sharedInit( tr_handle * h )
{
tr_shared * s = calloc( 1, sizeof( tr_shared ) );
s->h = h;
s->lock = tr_lockNew( );
s->publicPort = -1;
s->bindPort = -1;
s->bindSocket = -1;
s->natpmp = tr_natpmpInit();
s->upnp = tr_upnpInit();
s->pulseTimer = tr_timerNew( h, SharedLoop, s, 250 );
return s;
}
/***********************************************************************
* tr_sharedClose
***********************************************************************
*
**********************************************************************/
void tr_sharedClose( tr_shared * s )
{
tr_timerFree( &s->pulseTimer );
tr_netClose( s->bindSocket );
tr_lockFree( s->lock );
tr_natpmpClose( s->natpmp );
tr_upnpClose( s->upnp );
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free( s );
}
/**
***
**/
void tr_sharedLock( tr_shared * s )
{
tr_lockLock( s->lock );
}
void tr_sharedUnlock( tr_shared * s )
{
tr_lockUnlock( s->lock );
}
/***********************************************************************
* tr_sharedSetPort
***********************************************************************
*
**********************************************************************/
void tr_sharedSetPort( tr_shared * s, int port )
{
#ifdef BEOS_NETSERVER
/* BeOS net_server seems to be unable to set incoming connections
* to non-blocking. Too bad. */
return;
#endif
tr_sharedLock( s );
if( port == s->bindPort )
{
tr_sharedUnlock( s );
return;
}
s->bindPort = port;
/* Close the previous accept socket, if any */
if( s->bindSocket > -1 )
{
tr_netClose( s->bindSocket );
}
/* Create the new one */
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s->bindSocket = tr_netBindTCP( port );
/* Notify the trackers */
SetPublicPort( s, port );
/* XXX should handle failure here in a better way */
if( s->bindSocket < 0 )
{
/* Remove the forwarding for the old port */
tr_natpmpRemoveForwarding( s->natpmp );
tr_upnpRemoveForwarding( s->upnp );
}
else
{
tr_inf( "Bound listening port %d", port );
listen( s->bindSocket, 5 );
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/* Forward the new port */
tr_natpmpForwardPort( s->natpmp, port );
tr_upnpForwardPort( s->upnp, port );
}
tr_sharedUnlock( s );
}
int
tr_sharedGetPublicPort( const tr_shared * s )
{
return s->publicPort;
}
/***********************************************************************
* tr_sharedTraversalEnable, tr_sharedTraversalStatus
***********************************************************************
*
**********************************************************************/
void tr_sharedTraversalEnable( tr_shared * s, int enable )
{
if( enable )
{
tr_natpmpStart( s->natpmp );
tr_upnpStart( s->upnp );
}
else
{
tr_natpmpStop( s->natpmp );
tr_upnpStop( s->upnp );
}
}
int tr_sharedTraversalStatus( const tr_shared * s )
{
const int statuses[] = {
TR_NAT_TRAVERSAL_MAPPED,
TR_NAT_TRAVERSAL_MAPPING,
TR_NAT_TRAVERSAL_UNMAPPING,
TR_NAT_TRAVERSAL_ERROR,
TR_NAT_TRAVERSAL_NOTFOUND,
TR_NAT_TRAVERSAL_DISABLED,
-1,
};
int natpmp, upnp, ii;
natpmp = tr_natpmpStatus( s->natpmp );
upnp = tr_upnpStatus( s->upnp );
for( ii = 0; 0 <= statuses[ii]; ii++ )
{
if( statuses[ii] == natpmp || statuses[ii] == upnp )
{
return statuses[ii];
}
}
assert( 0 );
return TR_NAT_TRAVERSAL_ERROR;
}
/***********************************************************************
* Local functions
**********************************************************************/
/***********************************************************************
* SharedLoop
**********************************************************************/
static int
SharedLoop( void * vs )
{
int newPort;
tr_shared * s = vs;
tr_sharedLock( s );
/* NAT-PMP and UPnP pulses */
newPort = -1;
tr_natpmpPulse( s->natpmp, &newPort );
if( 0 < newPort && newPort != s->publicPort )
SetPublicPort( s, newPort );
tr_upnpPulse( s->upnp );
/* Handle incoming connections */
AcceptPeers( s );
tr_sharedUnlock( s );
return TRUE;
}
/***********************************************************************
* SetPublicPort
**********************************************************************/
static void SetPublicPort( tr_shared * s, int port )
{
tr_handle * h = s->h;
tr_torrent * tor;
s->publicPort = port;
for( tor = h->torrentList; tor; tor = tor->next )
tr_torrentChangeMyPort( tor );
}
/***********************************************************************
* AcceptPeers
***********************************************************************
* Check incoming connections and add the peers to our local list
**********************************************************************/
static void
AcceptPeers( tr_shared * s )
{
for( ;; )
{
int socket;
uint16_t port;
struct in_addr addr;
if( s->bindSocket < 0 || !tr_peerMgrIsAcceptingConnections( s->h->peerMgr ) )
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break;
socket = tr_netAccept( s->bindSocket, &addr, &port );
if( socket < 0 )
break;
tr_peerMgrAddIncoming( s->h->peerMgr, &addr, port, socket );
}
}