transmission/libtransmission/upnp.c

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/*
* This file Copyright (C) 2007-2009 Charles Kerr <charles@transmissionbt.com>
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*
* 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.
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*
* $Id$
*/
#include <assert.h>
#include <errno.h>
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#include <miniupnp/miniupnpc.h>
#include <miniupnp/upnpcommands.h>
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#include "transmission.h"
#include "port-forwarding.h"
#include "session.h"
#include "utils.h"
#include "upnp.h"
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static const char *
getKey( void ) { return _( "Port Forwarding (UPnP)" ); }
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typedef enum
{
TR_UPNP_IDLE,
TR_UPNP_ERR,
TR_UPNP_DISCOVER,
TR_UPNP_MAP,
TR_UPNP_UNMAP
}
tr_upnp_state;
struct tr_upnp
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{
tr_bool hasDiscovered;
struct UPNPUrls urls;
struct IGDdatas data;
int port;
char lanaddr[16];
unsigned int isMapped;
tr_upnp_state state;
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};
/**
***
**/
tr_upnp*
tr_upnpInit( void )
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{
tr_upnp * ret = tr_new0( tr_upnp, 1 );
ret->state = TR_UPNP_DISCOVER;
ret->port = -1;
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return ret;
}
void
tr_upnpClose( tr_upnp * handle )
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{
assert( !handle->isMapped );
assert( ( handle->state == TR_UPNP_IDLE )
|| ( handle->state == TR_UPNP_ERR )
|| ( handle->state == TR_UPNP_DISCOVER ) );
if( handle->hasDiscovered )
FreeUPNPUrls( &handle->urls );
tr_free( handle );
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}
/**
***
**/
int
tr_upnpPulse( tr_upnp * handle,
int port,
int isEnabled )
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{
int ret;
if( isEnabled && ( handle->state == TR_UPNP_DISCOVER ) )
{
struct UPNPDev * devlist;
errno = 0;
devlist = upnpDiscover( 2000, NULL, NULL, 0 );
if( devlist == NULL )
{
tr_ndbg(
getKey( ), "upnpDiscover failed (errno %d - %s)", errno,
tr_strerror( errno ) );
}
errno = 0;
if( UPNP_GetValidIGD( devlist, &handle->urls, &handle->data,
handle->lanaddr, sizeof( handle->lanaddr ) ) )
{
tr_ninf( getKey( ), _(
"Found Internet Gateway Device \"%s\"" ),
handle->urls.controlURL );
tr_ninf( getKey( ), _(
"Local Address is \"%s\"" ), handle->lanaddr );
handle->state = TR_UPNP_IDLE;
handle->hasDiscovered = 1;
}
else
{
handle->state = TR_UPNP_ERR;
tr_ndbg(
getKey( ), "UPNP_GetValidIGD failed (errno %d - %s)",
errno,
tr_strerror( errno ) );
tr_ndbg(
getKey( ),
"If your router supports UPnP, please make sure UPnP is enabled!" );
}
freeUPNPDevlist( devlist );
}
if( handle->state == TR_UPNP_IDLE )
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{
if( handle->isMapped && ( !isEnabled || ( handle->port != port ) ) )
handle->state = TR_UPNP_UNMAP;
}
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if( handle->state == TR_UPNP_UNMAP )
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{
char portStr[16];
tr_snprintf( portStr, sizeof( portStr ), "%d", handle->port );
UPNP_DeletePortMapping( handle->urls.controlURL,
handle->data.servicetype,
portStr, "TCP", NULL );
tr_ninf( getKey( ),
_(
"Stopping port forwarding through \"%s\", service \"%s\"" ),
handle->urls.controlURL, handle->data.servicetype );
handle->isMapped = 0;
handle->state = TR_UPNP_IDLE;
handle->port = -1;
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}
if( handle->state == TR_UPNP_IDLE )
{
if( isEnabled && !handle->isMapped )
handle->state = TR_UPNP_MAP;
}
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if( handle->state == TR_UPNP_MAP )
{
int err = -1;
errno = 0;
if( !handle->urls.controlURL || !handle->data.servicetype )
handle->isMapped = 0;
else
{
char portStr[16];
char desc[64];
tr_snprintf( portStr, sizeof( portStr ), "%d", port );
tr_snprintf( desc, sizeof( desc ), "%s at %d", TR_NAME, port );
err = UPNP_AddPortMapping( handle->urls.controlURL,
handle->data.servicetype,
portStr, portStr, handle->lanaddr,
desc, "TCP", NULL );
handle->isMapped = !err;
}
tr_ninf( getKey( ),
_(
"Port forwarding through \"%s\", service \"%s\". (local address: %s:%d)" ),
handle->urls.controlURL, handle->data.servicetype,
handle->lanaddr, port );
if( handle->isMapped )
{
tr_ninf( getKey( ), _( "Port forwarding successful!" ) );
handle->port = port;
handle->state = TR_UPNP_IDLE;
}
else
{
tr_ndbg(
getKey( ),
"Port forwarding failed with error %d (errno %d - %s)", err,
errno, tr_strerror( errno ) );
tr_ndbg(
getKey( ),
"If your router supports UPnP, please make sure UPnP is enabled!" );
handle->port = -1;
handle->state = TR_UPNP_ERR;
}
}
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switch( handle->state )
{
case TR_UPNP_DISCOVER:
ret = TR_PORT_UNMAPPED; break;
case TR_UPNP_MAP:
ret = TR_PORT_MAPPING; break;
case TR_UPNP_UNMAP:
ret = TR_PORT_UNMAPPING; break;
case TR_UPNP_IDLE:
ret = handle->isMapped ? TR_PORT_MAPPED
: TR_PORT_UNMAPPED; break;
default:
ret = TR_PORT_ERROR; break;
}
return ret;
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}