794 lines
22 KiB
C
794 lines
22 KiB
C
![]() |
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2006 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include "transmission.h"
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#define PMP_PORT 5351
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#define PMP_MCAST_ADDR "224.0.0.1"
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#define PMP_INITIAL_DELAY 250 /* ms, 1/4 second */
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#define PMP_TOTAL_DELAY 120000 /* ms, 2 minutes */
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#define PMP_VERSION 0
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#define PMP_OPCODE_GETIP 0
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#define PMP_OPCODE_ADDUDP 1
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#define PMP_OPCODE_ADDTCP 2
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#define PMP_LIFETIME 3600 /* secs, one hour */
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#define PMP_RESPCODE_OK 0
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#define PMP_RESPCODE_BADVERS 1
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#define PMP_RESPCODE_REFUSED 2
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#define PMP_RESPCODE_NETDOWN 3
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#define PMP_RESPCODE_NOMEM 4
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#define PMP_RESPCODE_BADOPCODE 5
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#define PMP_OPCODE_FROM_RESPONSE( op ) ( 0x80 ^ (op) )
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#define PMP_OPCODE_TO_RESPONSE( op ) ( 0x80 | (op) )
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#define PMP_OPCODE_IS_RESPONSE( op ) ( 0x80 & (op) )
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#define PMP_TOBUF16( buf, num ) ( *( (uint16_t *) (buf) ) = htons( (num) ) )
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#define PMP_TOBUF32( buf, num ) ( *( (uint32_t *) (buf) ) = htonl( (num) ) )
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#define PMP_FROMBUF16( buf ) ( htons( *( (uint16_t *) (buf) ) ) )
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#define PMP_FROMBUF32( buf ) ( htonl( *( (uint32_t *) (buf) ) ) )
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typedef struct tr_natpmp_uptime_s
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{
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time_t when;
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uint32_t uptime;
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} tr_natpmp_uptime_t;
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typedef struct tr_natpmp_req_s
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{
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unsigned int adding : 1;
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unsigned int nobodyhome : 1;
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unsigned int tmpfail : 1;
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int fd;
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int delay;
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uint64_t retry;
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uint64_t timeout;
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int port;
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tr_fd_t * fdlimit;
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tr_natpmp_uptime_t * uptime;
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} tr_natpmp_req_t;
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struct tr_natpmp_s
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{
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#define PMP_STATE_IDLE 1
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#define PMP_STATE_ADDING 2
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#define PMP_STATE_DELETING 3
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#define PMP_STATE_MAPPED 4
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#define PMP_STATE_FAILED 5
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#define PMP_STATE_NOBODYHOME 6
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#define PMP_STATE_TMPFAIL 7
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char state;
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unsigned int active : 1;
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struct in_addr dest;
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int newport;
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int mappedport;
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tr_fd_t * fdlimit;
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tr_lock_t lock;
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uint64_t renew;
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tr_natpmp_req_t * req;
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tr_natpmp_uptime_t uptime;
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int mcastfd;
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};
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static int
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checktime( tr_natpmp_uptime_t * uptime, uint32_t seen );
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static void
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killsock( int * fd, tr_fd_t * fdlimit );
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static tr_natpmp_req_t *
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newreq( int adding, struct in_addr addr, int port, tr_fd_t * fdlimit,
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tr_natpmp_uptime_t * uptime );
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static tr_tristate_t
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pulsereq( tr_natpmp_req_t * req, uint64_t * renew );
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static int
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mcastsetup( tr_fd_t * fdlimit );
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static void
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mcastpulse( tr_natpmp_t * pmp );
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static void
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killreq( tr_natpmp_req_t ** req );
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static int
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sendrequest( int adding, int fd, int port );
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static tr_tristate_t
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readrequest( uint8_t * buf, int len, int adding, int port,
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tr_natpmp_uptime_t * uptime, uint64_t * renew, int * tmpfail );
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tr_natpmp_t *
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tr_natpmpInit( tr_fd_t * fdlimit )
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{
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tr_natpmp_t * pmp;
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pmp = calloc( 1, sizeof( *pmp ) );
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if( NULL == pmp )
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{
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return NULL;
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}
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pmp->state = PMP_STATE_IDLE;
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pmp->fdlimit = fdlimit;
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pmp->mcastfd = -1;
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if( tr_getDefaultRoute( &pmp->dest ) || INADDR_ANY == pmp->dest.s_addr )
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{
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pmp->dest.s_addr = INADDR_NONE;
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}
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if( INADDR_NONE == pmp->dest.s_addr )
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{
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tr_dbg( "nat-pmp device is unknown" );
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}
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else
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{
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char addrstr[INET_ADDRSTRLEN];
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tr_netNtop( &pmp->dest, addrstr, sizeof( addrstr ) );
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tr_dbg( "nat-pmp device is %s", addrstr );
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}
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tr_lockInit( &pmp->lock );
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return pmp;
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}
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void
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tr_natpmpStart( tr_natpmp_t * pmp )
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{
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tr_lockLock( &pmp->lock );
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if( !pmp->active )
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{
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tr_inf( "starting nat-pmp" );
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pmp->active = 1;
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if( 0 > pmp->mcastfd )
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{
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pmp->mcastfd = mcastsetup( pmp->fdlimit );
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}
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/* XXX should I change state? */
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}
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tr_lockUnlock( &pmp->lock );
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}
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void
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tr_natpmpStop( tr_natpmp_t * pmp )
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{
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tr_lockLock( &pmp->lock );
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if( pmp->active )
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{
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tr_inf( "stopping nat-pmp" );
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pmp->active = 0;
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killsock( &pmp->mcastfd, pmp->fdlimit );
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switch( pmp->state )
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{
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case PMP_STATE_IDLE:
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break;
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case PMP_STATE_ADDING:
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pmp->state = PMP_STATE_IDLE;
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tr_dbg( "nat-pmp state add -> idle" );
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if( NULL != pmp->req )
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{
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killreq( &pmp->req );
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pmp->mappedport = pmp->req->port;
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pmp->state = PMP_STATE_DELETING;
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tr_dbg( "nat-pmp state idle -> del" );
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}
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break;
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case PMP_STATE_DELETING:
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break;
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case PMP_STATE_MAPPED:
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pmp->state = PMP_STATE_DELETING;
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tr_dbg( "nat-pmp state mapped -> del" );
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break;
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case PMP_STATE_FAILED:
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case PMP_STATE_NOBODYHOME:
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case PMP_STATE_TMPFAIL:
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break;
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default:
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assert( 0 );
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break;
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}
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}
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tr_lockUnlock( &pmp->lock );
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}
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int
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tr_natpmpStatus( tr_natpmp_t * pmp )
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{
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int ret;
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tr_lockLock( &pmp->lock );
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if( !pmp->active )
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{
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ret = ( PMP_STATE_DELETING == pmp->state ?
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TR_NAT_TRAVERSAL_UNMAPPING : TR_NAT_TRAVERSAL_DISABLED );
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}
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else if( 0 < pmp->mappedport )
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{
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ret = TR_NAT_TRAVERSAL_MAPPED;
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}
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else
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{
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switch( pmp->state )
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{
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case PMP_STATE_IDLE:
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case PMP_STATE_ADDING:
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case PMP_STATE_DELETING:
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ret = TR_NAT_TRAVERSAL_MAPPING;
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break;
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case PMP_STATE_FAILED:
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case PMP_STATE_TMPFAIL:
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ret = TR_NAT_TRAVERSAL_ERROR;
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break;
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case PMP_STATE_NOBODYHOME:
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ret = TR_NAT_TRAVERSAL_NOTFOUND;
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break;
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case PMP_STATE_MAPPED:
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default:
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assert( 0 );
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ret = TR_NAT_TRAVERSAL_ERROR;
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break;
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}
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}
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tr_lockUnlock( &pmp->lock );
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return ret;
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}
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void
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tr_natpmpForwardPort( tr_natpmp_t * pmp, int port )
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{
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tr_lockLock( &pmp->lock );
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tr_inf( "nat-pmp set port %i", port );
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pmp->newport = port;
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tr_lockUnlock( &pmp->lock );
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}
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void
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tr_natpmpClose( tr_natpmp_t * pmp )
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{
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/* try to send at least one delete request if we have a port mapping */
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tr_natpmpStop( pmp );
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tr_natpmpPulse( pmp );
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tr_lockLock( &pmp->lock );
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killreq( &pmp->req );
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tr_lockClose( &pmp->lock );
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free( pmp );
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}
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void
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tr_natpmpPulse( tr_natpmp_t * pmp )
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{
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tr_lockLock( &pmp->lock );
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if( 0 <= pmp->mcastfd )
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{
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mcastpulse( pmp );
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}
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if( pmp->active || PMP_STATE_DELETING == pmp->state )
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{
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switch( pmp->state )
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{
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case PMP_STATE_IDLE:
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case PMP_STATE_TMPFAIL:
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if( 0 < pmp->newport )
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{
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tr_dbg( "nat-pmp state %s -> add with port %i",
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( PMP_STATE_IDLE == pmp->state ? "idle" : "err" ),
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pmp->newport );
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pmp->state = PMP_STATE_ADDING;
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}
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break;
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case PMP_STATE_ADDING:
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if( NULL == pmp->req )
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{
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if( 0 >= pmp->newport )
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{
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tr_dbg( "nat-pmp state add -> idle, no port" );
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pmp->state = PMP_STATE_IDLE;
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}
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else if( INADDR_NONE == pmp->dest.s_addr )
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{
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tr_dbg( "nat-pmp state add -> fail, no default route" );
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pmp->state = PMP_STATE_FAILED;
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}
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else
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{
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pmp->req = newreq( 1, pmp->dest, pmp->newport,
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pmp->fdlimit, &pmp->uptime );
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if( NULL == pmp->req )
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{
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pmp->state = PMP_STATE_FAILED;
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tr_dbg( "nat-pmp state add -> fail on req init" );
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}
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}
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}
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if( PMP_STATE_ADDING == pmp->state )
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{
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switch( pulsereq( pmp->req, &pmp->renew ) )
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{
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case TR_ERROR:
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if( pmp->req->nobodyhome )
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{
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pmp->state = PMP_STATE_NOBODYHOME;
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tr_dbg( "nat-pmp state add -> nobodyhome on pulse" );
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}
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else if( pmp->req->tmpfail )
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{
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pmp->state = PMP_STATE_TMPFAIL;
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tr_dbg( "nat-pmp state add -> err on pulse" );
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if( pmp->req->port == pmp->newport )
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{
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pmp->newport = 0;
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}
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}
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else
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{
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pmp->state = PMP_STATE_FAILED;
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tr_dbg( "nat-pmp state add -> fail on pulse" );
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}
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killreq( &pmp->req );
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break;
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case TR_OK:
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pmp->mappedport = pmp->req->port;
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killreq( &pmp->req );
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pmp->state = PMP_STATE_MAPPED;
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tr_dbg( "nat-pmp state add -> mapped with port %i",
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pmp->mappedport);
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tr_inf( "nat-pmp mapped port %i", pmp->mappedport );
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break;
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case TR_WAIT:
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break;
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}
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}
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break;
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case PMP_STATE_DELETING:
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if( NULL == pmp->req )
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{
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assert( 0 < pmp->mappedport );
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pmp->req = newreq( 0, pmp->dest, pmp->mappedport,
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pmp->fdlimit, &pmp->uptime );
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if( NULL == pmp->req )
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{
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pmp->state = PMP_STATE_FAILED;
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tr_dbg( "nat-pmp state del -> fail on req init" );
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}
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}
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if( PMP_STATE_DELETING == pmp->state )
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{
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switch( pulsereq( pmp->req, &pmp->renew ) )
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{
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case TR_ERROR:
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if( pmp->req->nobodyhome )
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{
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pmp->state = PMP_STATE_NOBODYHOME;
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tr_dbg( "nat-pmp state del -> nobodyhome on pulse" );
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}
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else if( pmp->req->tmpfail )
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{
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pmp->state = PMP_STATE_TMPFAIL;
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tr_dbg( "nat-pmp state del -> err on pulse" );
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pmp->mappedport = -1;
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}
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else
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{
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pmp->state = PMP_STATE_FAILED;
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tr_dbg( "nat-pmp state del -> fail on pulse" );
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}
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killreq( &pmp->req );
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break;
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case TR_OK:
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tr_dbg( "nat-pmp state del -> idle with port %i",
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pmp->req->port);
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tr_inf( "nat-pmp unmapped port %i", pmp->req->port );
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pmp->mappedport = -1;
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killreq( &pmp->req );
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pmp->state = PMP_STATE_IDLE;
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break;
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case TR_WAIT:
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break;
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}
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}
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break;
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case PMP_STATE_MAPPED:
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if( pmp->newport != pmp->mappedport )
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{
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tr_dbg( "nat-pmp state mapped -> del, port from %i to %i",
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pmp->mappedport, pmp->newport );
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pmp->state = PMP_STATE_DELETING;
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}
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else if( tr_date() > pmp->renew )
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{
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pmp->state = PMP_STATE_ADDING;
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tr_dbg( "nat-pmp state mapped -> add for renewal" );
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}
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break;
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case PMP_STATE_FAILED:
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||
|
case PMP_STATE_NOBODYHOME:
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
assert( 0 );
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
tr_lockUnlock( &pmp->lock );
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
checktime( tr_natpmp_uptime_t * uptime, uint32_t cursecs )
|
||
|
{
|
||
|
time_t now;
|
||
|
int ret;
|
||
|
uint32_t estimated;
|
||
|
|
||
|
now = time( NULL );
|
||
|
ret = 0;
|
||
|
if( 0 < uptime->when )
|
||
|
{
|
||
|
estimated = ( ( now - uptime->when ) * 7 / 8 ) + uptime->uptime;
|
||
|
if( estimated > cursecs )
|
||
|
{
|
||
|
ret = 1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
uptime->when = now;
|
||
|
uptime->uptime = cursecs;
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
killsock( int * fd, tr_fd_t * fdlimit )
|
||
|
{
|
||
|
if( 0 <= *fd )
|
||
|
{
|
||
|
tr_netClose( *fd );
|
||
|
*fd = -1;
|
||
|
tr_fdSocketClosed( fdlimit, 0 );
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static tr_natpmp_req_t *
|
||
|
newreq( int adding, struct in_addr addr, int port, tr_fd_t * fdlimit,
|
||
|
tr_natpmp_uptime_t * uptime )
|
||
|
{
|
||
|
tr_natpmp_req_t * ret;
|
||
|
uint64_t now;
|
||
|
|
||
|
ret = calloc( 1, sizeof( *ret ) );
|
||
|
if( NULL == ret )
|
||
|
{
|
||
|
goto err;
|
||
|
}
|
||
|
ret->fd = -1;
|
||
|
if( tr_fdSocketWillCreate( fdlimit, 0 ) )
|
||
|
{
|
||
|
goto err;
|
||
|
}
|
||
|
ret->fd = tr_netOpenUDP( addr, htons( PMP_PORT ) );
|
||
|
if( 0 > ret->fd )
|
||
|
{
|
||
|
goto err;
|
||
|
}
|
||
|
if( sendrequest( adding, ret->fd, port ) )
|
||
|
{
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
now = tr_date();
|
||
|
ret->adding = adding;
|
||
|
ret->delay = PMP_INITIAL_DELAY;
|
||
|
ret->retry = now + PMP_INITIAL_DELAY;
|
||
|
ret->timeout = now + PMP_TOTAL_DELAY;
|
||
|
ret->port = port;
|
||
|
ret->fdlimit = fdlimit;
|
||
|
ret->uptime = uptime;
|
||
|
|
||
|
return ret;
|
||
|
|
||
|
err:
|
||
|
if( NULL != ret )
|
||
|
{
|
||
|
killsock( &ret->fd, fdlimit );
|
||
|
}
|
||
|
free( ret );
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
static tr_tristate_t
|
||
|
pulsereq( tr_natpmp_req_t * req, uint64_t * renew )
|
||
|
{
|
||
|
struct sockaddr_in sin;
|
||
|
uint8_t buf[16];
|
||
|
int res, tmpfail;
|
||
|
uint64_t now;
|
||
|
tr_tristate_t ret;
|
||
|
|
||
|
now = tr_date();
|
||
|
|
||
|
if( now >= req->timeout )
|
||
|
{
|
||
|
tr_dbg( "nat-pmp request timed out" );
|
||
|
req->nobodyhome = 1;
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
|
||
|
if( now >= req->retry )
|
||
|
{
|
||
|
if( sendrequest( req->adding, req->fd, req->port ) )
|
||
|
{
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
req->delay *= 2;
|
||
|
req->timeout = now + req->delay;
|
||
|
}
|
||
|
|
||
|
res = tr_netRecvFrom( req->fd, buf, sizeof( buf ), &sin );
|
||
|
if( TR_NET_BLOCK & res )
|
||
|
{
|
||
|
return TR_WAIT;
|
||
|
}
|
||
|
else if( TR_NET_CLOSE & res )
|
||
|
{
|
||
|
if( ECONNRESET == errno || ECONNREFUSED == errno )
|
||
|
{
|
||
|
tr_dbg( "nat-pmp not supported by device" );
|
||
|
req->nobodyhome = 1;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
tr_inf( "error reading nat-pmp response (%s)", strerror( errno ) );
|
||
|
}
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
|
||
|
tr_dbg( "nat-pmp read %i byte response", res );
|
||
|
|
||
|
ret = readrequest( buf, res, req->adding, req->port, req->uptime, renew,
|
||
|
&tmpfail );
|
||
|
req->tmpfail = ( tmpfail ? 1 : 0 );
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
mcastsetup( tr_fd_t * fdlimit )
|
||
|
{
|
||
|
int fd;
|
||
|
struct in_addr addr;
|
||
|
|
||
|
if( tr_fdSocketWillCreate( fdlimit, 0 ) )
|
||
|
{
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
addr.s_addr = inet_addr( PMP_MCAST_ADDR );
|
||
|
fd = tr_netMcastOpen( PMP_PORT, addr );
|
||
|
if( 0 > fd )
|
||
|
{
|
||
|
tr_fdSocketClosed( fdlimit, 0 );
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
tr_dbg( "nat-pmp create multicast socket %i", fd );
|
||
|
|
||
|
return fd;
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
mcastpulse( tr_natpmp_t * pmp )
|
||
|
{
|
||
|
struct sockaddr_in sin;
|
||
|
uint8_t buf[16];
|
||
|
int res;
|
||
|
char dbgstr[INET_ADDRSTRLEN];
|
||
|
|
||
|
res = tr_netRecvFrom( pmp->mcastfd, buf, sizeof( buf ), &sin );
|
||
|
if( TR_NET_BLOCK & res )
|
||
|
{
|
||
|
return;
|
||
|
}
|
||
|
else if( TR_NET_CLOSE & res )
|
||
|
{
|
||
|
tr_err( "error reading nat-pmp multicast message" );
|
||
|
killsock( &pmp->mcastfd, pmp->fdlimit );
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
tr_netNtop( &sin.sin_addr, dbgstr, sizeof( dbgstr ) );
|
||
|
tr_dbg( "nat-pmp read %i byte multicast packet from %s", res, dbgstr );
|
||
|
|
||
|
if( pmp->dest.s_addr != sin.sin_addr.s_addr )
|
||
|
{
|
||
|
tr_dbg( "nat-pmp ignoring multicast packet from unknown host %s",
|
||
|
dbgstr );
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if( TR_OK == readrequest( buf, res, 0, -1, &pmp->uptime, &pmp->renew, NULL ) &&
|
||
|
PMP_STATE_NOBODYHOME == pmp->state )
|
||
|
{
|
||
|
tr_dbg( "nat-pmp state notfound -> idle" );
|
||
|
pmp->state = PMP_STATE_IDLE;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
killreq( tr_natpmp_req_t ** req )
|
||
|
{
|
||
|
if( NULL != *req )
|
||
|
{
|
||
|
killsock( &(*req)->fd, (*req)->fdlimit );
|
||
|
free( *req );
|
||
|
*req = NULL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
sendrequest( int adding, int fd, int port )
|
||
|
{
|
||
|
uint8_t buf[12];
|
||
|
int res;
|
||
|
|
||
|
buf[0] = PMP_VERSION;
|
||
|
buf[1] = PMP_OPCODE_ADDTCP;
|
||
|
buf[2] = 0;
|
||
|
buf[3] = 0;
|
||
|
PMP_TOBUF16( buf + 4, port );
|
||
|
if( adding )
|
||
|
{
|
||
|
PMP_TOBUF16( buf + 6, port );
|
||
|
PMP_TOBUF32( buf + 8, PMP_LIFETIME );
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
PMP_TOBUF16( buf + 6, 0 );
|
||
|
PMP_TOBUF32( buf + 8, 0 );
|
||
|
}
|
||
|
|
||
|
res = tr_netSend( fd, buf, sizeof( buf ) );
|
||
|
/* XXX is it all right to assume the entire thing is written? */
|
||
|
|
||
|
/* XXX I should handle blocking here */
|
||
|
|
||
|
return ( ( TR_NET_CLOSE | TR_NET_BLOCK ) & res ? 1 : 0 );
|
||
|
}
|
||
|
|
||
|
static tr_tristate_t
|
||
|
readrequest( uint8_t * buf, int len, int adding, int port,
|
||
|
tr_natpmp_uptime_t * uptime, uint64_t * renew, int * tmpfail )
|
||
|
{
|
||
|
uint8_t version, opcode, wantedopcode;
|
||
|
uint16_t rescode, privport, pubport;
|
||
|
uint32_t seconds, lifetime;
|
||
|
|
||
|
assert( !adding || NULL != tmpfail );
|
||
|
if( NULL != tmpfail )
|
||
|
{
|
||
|
*tmpfail = 0;
|
||
|
}
|
||
|
if( 4 > len )
|
||
|
{
|
||
|
tr_err( "read truncated %i byte nat-pmp response packet", len );
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
version = buf[0];
|
||
|
opcode = buf[1];
|
||
|
rescode = PMP_FROMBUF16( buf + 2 );
|
||
|
wantedopcode = ( 0 < port ? PMP_OPCODE_ADDTCP : PMP_OPCODE_GETIP );
|
||
|
|
||
|
if( !PMP_OPCODE_IS_RESPONSE( opcode ) )
|
||
|
{
|
||
|
tr_dbg( "nat-pmp ignoring request packet" );
|
||
|
return TR_WAIT;
|
||
|
}
|
||
|
opcode = PMP_OPCODE_FROM_RESPONSE( opcode );
|
||
|
|
||
|
if( PMP_VERSION != version )
|
||
|
{
|
||
|
tr_err( "bad nat-pmp version %hhu", buf[0] );
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
if( wantedopcode != opcode )
|
||
|
{
|
||
|
tr_err( "bad nat-pmp opcode %hhu", opcode );
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
switch( rescode )
|
||
|
{
|
||
|
case PMP_RESPCODE_OK:
|
||
|
break;
|
||
|
case PMP_RESPCODE_REFUSED:
|
||
|
case PMP_RESPCODE_NETDOWN:
|
||
|
case PMP_RESPCODE_NOMEM:
|
||
|
if( NULL != tmpfail )
|
||
|
{
|
||
|
*tmpfail = 1;
|
||
|
}
|
||
|
/* fallthrough */
|
||
|
default:
|
||
|
tr_err( "bad nat-pmp result code %hu", rescode );
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
|
||
|
if( 8 > len )
|
||
|
{
|
||
|
tr_err( "read truncated %i byte nat-pmp response packet", len );
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
seconds = PMP_FROMBUF32( buf + 4 );
|
||
|
|
||
|
if( checktime( uptime, seconds ) )
|
||
|
{
|
||
|
*renew = 0;
|
||
|
tr_inf( "detected nat-pmp device reset" );
|
||
|
/* XXX should reset retry counter here */
|
||
|
return TR_WAIT;
|
||
|
}
|
||
|
|
||
|
if( 0 <= port )
|
||
|
{
|
||
|
assert( PMP_OPCODE_ADDTCP == wantedopcode );
|
||
|
if( 16 > len )
|
||
|
{
|
||
|
tr_err( "read truncated %i byte nat-pmp response packet", len );
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
privport = PMP_FROMBUF16( buf + 8 );
|
||
|
pubport = PMP_FROMBUF16( buf + 10 );
|
||
|
lifetime = PMP_FROMBUF32( buf + 12 );
|
||
|
|
||
|
if( port != privport )
|
||
|
{
|
||
|
/* private port doesn't match, ignore it */
|
||
|
tr_dbg( "nat-pmp ignoring message for port %i, expected port %i",
|
||
|
privport, port );
|
||
|
return TR_WAIT;
|
||
|
}
|
||
|
|
||
|
if( adding )
|
||
|
{
|
||
|
if( port != pubport )
|
||
|
{
|
||
|
*tmpfail = 1;
|
||
|
/* XXX should just start announcing the pub port we're given */
|
||
|
return TR_ERROR;
|
||
|
}
|
||
|
tr_dbg( "nat-pmp set renew to half of %u", lifetime );
|
||
|
*renew = tr_date() + ( lifetime / 2 * 1000 );
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return TR_OK;
|
||
|
}
|