2007-12-08 19:34:15 +00:00
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/*
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* This file Copyright (C) 2007 Charles Kerr <charles@rebelbase.com>
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2006-09-25 18:37:45 +00:00
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*
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2007-12-08 19:34:15 +00:00
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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2006-09-25 18:37:45 +00:00
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*
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2007-12-13 01:20:16 +00:00
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* $Id$
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2007-12-08 19:34:15 +00:00
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*/
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2006-09-25 18:37:45 +00:00
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2007-11-09 20:07:52 +00:00
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#include <assert.h>
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2007-07-29 18:11:21 +00:00
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#include <errno.h>
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#include <time.h>
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2007-12-08 19:34:15 +00:00
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#include <inttypes.h>
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#include <string.h> /* strerror */
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2007-07-29 18:11:21 +00:00
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2007-12-08 19:34:15 +00:00
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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2007-08-04 02:55:06 +00:00
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2007-12-08 19:34:15 +00:00
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#include <libnatpmp/natpmp.h>
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2007-07-14 16:29:21 +00:00
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2006-09-25 18:37:45 +00:00
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#include "transmission.h"
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2007-07-09 20:10:42 +00:00
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#include "natpmp.h"
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2007-12-08 19:34:15 +00:00
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#include "shared.h"
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2007-07-30 18:04:10 +00:00
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#include "utils.h"
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2006-09-25 18:37:45 +00:00
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2007-12-08 19:34:15 +00:00
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#define LIFETIME_SECS 3600
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2007-12-13 19:28:51 +00:00
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#define COMMAND_WAIT_SECS 8
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2006-09-25 18:37:45 +00:00
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2007-12-08 19:34:15 +00:00
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#define KEY "Port Mapping (NAT-PMP): "
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2006-09-25 18:37:45 +00:00
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2007-12-08 19:34:15 +00:00
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typedef enum
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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TR_NATPMP_IDLE,
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TR_NATPMP_ERR,
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2007-12-13 18:56:22 +00:00
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TR_NATPMP_DISCOVER,
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2007-12-08 19:34:15 +00:00
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TR_NATPMP_RECV_PUB,
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TR_NATPMP_SEND_MAP,
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TR_NATPMP_RECV_MAP,
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TR_NATPMP_SEND_UNMAP,
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TR_NATPMP_RECV_UNMAP
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}
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tr_natpmp_state;
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2007-11-06 16:02:50 +00:00
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struct tr_natpmp
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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int port;
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2007-12-13 18:56:22 +00:00
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unsigned int isMapped : 1;
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unsigned int hasDiscovered : 1;
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2007-12-08 19:34:15 +00:00
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time_t renewTime;
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2007-12-13 19:28:51 +00:00
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time_t commandTime;
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2007-12-08 19:34:15 +00:00
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tr_natpmp_state state;
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natpmp_t natpmp;
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2006-09-25 18:37:45 +00:00
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};
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2007-12-08 19:34:15 +00:00
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/**
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***
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**/
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2007-02-06 03:24:55 +00:00
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2007-04-15 07:36:24 +00:00
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static void
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2007-12-08 19:34:15 +00:00
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logVal( const char * func, int ret )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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if( ret==NATPMP_TRYAGAIN )
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tr_dbg( KEY "%s returned 'try again'", func );
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else if( ret >= 0 )
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tr_dbg( KEY "%s returned success (%d)", func, ret );
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2006-09-25 18:37:45 +00:00
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else
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2007-12-08 19:34:15 +00:00
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tr_err( KEY "%s returned error %d, errno is %d (%s)", func, ret, errno, strerror(errno) );
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2006-09-25 18:37:45 +00:00
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}
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2007-12-08 19:34:15 +00:00
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struct tr_natpmp*
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tr_natpmpInit( void )
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2007-04-15 07:36:24 +00:00
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{
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2007-12-13 18:56:22 +00:00
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struct tr_natpmp * nat;
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nat = tr_new0( struct tr_natpmp, 1 );
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nat->state = TR_NATPMP_DISCOVER;
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2007-12-08 19:34:15 +00:00
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nat->port = -1;
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return nat;
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2006-09-25 18:37:45 +00:00
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}
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void
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2007-12-08 19:34:15 +00:00
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tr_natpmpClose( tr_natpmp * nat )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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assert( !nat->isMapped );
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2007-12-13 20:19:52 +00:00
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assert( ( nat->state == TR_NATPMP_IDLE )
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|| ( nat->state == TR_NATPMP_ERR )
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|| ( nat->state == TR_NATPMP_DISCOVER ) );
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2007-04-17 02:35:14 +00:00
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2007-12-08 19:34:15 +00:00
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closenatpmp( &nat->natpmp );
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tr_free( nat );
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2006-09-25 18:37:45 +00:00
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}
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2007-12-13 19:28:51 +00:00
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static int
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canSendCommand( const struct tr_natpmp * nat )
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{
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return time(NULL) >= nat->commandTime;
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}
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static void
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setCommandTime( struct tr_natpmp * nat )
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{
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nat->commandTime = time(NULL) + COMMAND_WAIT_SECS;
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}
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2007-12-15 06:10:24 +00:00
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static void
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setErrorState( struct tr_natpmp * nat )
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{
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tr_err( KEY "If your router supports NAT-PMP, please make sure NAT-PMP is enabled!" );
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tr_err( KEY "NAT-PMP port forwarding unsuccessful, trying UPnP next" );
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nat->state = TR_NATPMP_ERR;
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}
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2007-12-08 19:34:15 +00:00
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int
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tr_natpmpPulse( struct tr_natpmp * nat, int port, int isEnabled )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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int ret;
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2006-09-25 18:37:45 +00:00
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2007-12-13 18:56:22 +00:00
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if( isEnabled && ( nat->state == TR_NATPMP_DISCOVER ) )
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{
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int val = initnatpmp( &nat->natpmp );
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logVal( "initnatpmp", val );
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val = sendpublicaddressrequest( &nat->natpmp );
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logVal( "sendpublicaddressrequest", val );
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nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_PUB;
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nat->hasDiscovered = 1;
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2007-12-13 19:28:51 +00:00
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setCommandTime( nat );
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2007-12-13 18:56:22 +00:00
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}
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2007-12-13 19:28:51 +00:00
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if( ( nat->state == TR_NATPMP_RECV_PUB ) && canSendCommand( nat ) )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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natpmpresp_t response;
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const int val = readnatpmpresponseorretry( &nat->natpmp, &response );
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logVal( "readnatpmpresponseorretry", val );
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if( val >= 0 ) {
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tr_inf( KEY "found public address %s", inet_ntoa( response.publicaddress.addr ) );
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nat->state = TR_NATPMP_IDLE;
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} else if( val != NATPMP_TRYAGAIN ) {
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2007-12-15 06:10:24 +00:00
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setErrorState( nat );
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2006-09-25 18:37:45 +00:00
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}
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}
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2007-12-08 19:34:15 +00:00
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if( ( nat->state == TR_NATPMP_IDLE ) || ( nat->state == TR_NATPMP_ERR ) )
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2007-02-06 03:24:55 +00:00
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{
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2007-12-08 19:34:15 +00:00
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if( nat->isMapped && ( !isEnabled || ( nat->port != port ) ) )
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nat->state = TR_NATPMP_SEND_UNMAP;
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2007-02-06 03:24:55 +00:00
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}
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2006-09-25 18:37:45 +00:00
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2007-12-13 19:28:51 +00:00
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if( ( nat->state == TR_NATPMP_SEND_UNMAP ) && canSendCommand( nat ) )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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const int val = sendnewportmappingrequest( &nat->natpmp, NATPMP_PROTOCOL_TCP, nat->port, nat->port, 0 );
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logVal( "sendnewportmappingrequest", val );
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nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_UNMAP;
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2007-12-13 19:28:51 +00:00
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setCommandTime( nat );
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2006-09-25 18:37:45 +00:00
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}
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2007-12-08 19:34:15 +00:00
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if( nat->state == TR_NATPMP_RECV_UNMAP )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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natpmpresp_t resp;
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const int val = readnatpmpresponseorretry( &nat->natpmp, &resp );
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logVal( "readnatpmpresponseorretry", val );
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if( val >= 0 ) {
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tr_inf( KEY "port %d has been unmapped.", nat->port );
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nat->state = TR_NATPMP_IDLE;
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nat->port = -1;
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nat->isMapped = 0;
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} else if( val != NATPMP_TRYAGAIN ) {
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2007-12-15 06:10:24 +00:00
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setErrorState( nat );
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2007-02-06 03:24:55 +00:00
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}
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2007-01-28 08:54:19 +00:00
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}
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2007-02-06 03:24:55 +00:00
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2007-12-08 19:34:15 +00:00
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if( nat->state == TR_NATPMP_IDLE )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-13 18:56:22 +00:00
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if( isEnabled && !nat->isMapped && nat->hasDiscovered )
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2007-12-08 19:34:15 +00:00
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nat->state = TR_NATPMP_SEND_MAP;
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2006-09-25 18:37:45 +00:00
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2007-12-13 01:20:16 +00:00
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else if( nat->isMapped && time(NULL) >= nat->renewTime )
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2007-12-08 19:34:15 +00:00
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nat->state = TR_NATPMP_SEND_MAP;
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2006-09-25 18:37:45 +00:00
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}
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2007-02-06 03:24:55 +00:00
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2007-12-13 19:28:51 +00:00
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if( ( nat->state == TR_NATPMP_SEND_MAP ) && canSendCommand( nat ) )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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const int val = sendnewportmappingrequest( &nat->natpmp, NATPMP_PROTOCOL_TCP, port, port, LIFETIME_SECS );
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logVal( "sendnewportmappingrequest", val );
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nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_MAP;
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2007-12-13 19:28:51 +00:00
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setCommandTime( nat );
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2006-09-25 18:37:45 +00:00
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}
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2007-12-08 19:34:15 +00:00
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if( nat->state == TR_NATPMP_RECV_MAP )
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2006-09-25 18:37:45 +00:00
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{
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2007-12-08 19:34:15 +00:00
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natpmpresp_t resp;
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const int val = readnatpmpresponseorretry( &nat->natpmp, &resp );
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logVal( "readnatpmpresponseorretry", val );
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if( val >= 0 ) {
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nat->state = TR_NATPMP_IDLE;
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nat->isMapped = 1;
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nat->renewTime = time( NULL ) + LIFETIME_SECS;
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nat->port = resp.newportmapping.privateport;
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tr_inf( KEY "port %d mapped successfully", nat->port );
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} else if( val != NATPMP_TRYAGAIN ) {
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2007-12-15 06:10:24 +00:00
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setErrorState( nat );
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2006-09-25 18:37:45 +00:00
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}
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}
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2007-12-13 18:56:22 +00:00
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switch( nat->state ) {
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case TR_NATPMP_IDLE: ret = nat->isMapped ? TR_NAT_TRAVERSAL_MAPPED : TR_NAT_TRAVERSAL_UNMAPPED; break;
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case TR_NATPMP_DISCOVER: ret = TR_NAT_TRAVERSAL_UNMAPPED; break;
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case TR_NATPMP_RECV_PUB:
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case TR_NATPMP_SEND_MAP:
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case TR_NATPMP_RECV_MAP: ret = TR_NAT_TRAVERSAL_MAPPING; break;
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case TR_NATPMP_SEND_UNMAP:
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case TR_NATPMP_RECV_UNMAP: ret = TR_NAT_TRAVERSAL_UNMAPPING; break;
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default: ret = TR_NAT_TRAVERSAL_ERROR; break;
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}
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2007-12-08 19:34:15 +00:00
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return ret;
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2006-09-25 18:37:45 +00:00
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}
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