int
tr_natpmpPulse( struct tr_natpmp * nat, tr_port private_port, bool is_enabled, tr_port * public_port )
{
int ret;
if( is_enabled && ( nat->state == TR_NATPMP_DISCOVER ) )
{
int val = initnatpmp( &nat->natpmp );
logVal( "initnatpmp", val );
val = sendpublicaddressrequest( &nat->natpmp );
logVal( "sendpublicaddressrequest", val );
nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_PUB;
nat->has_discovered = true;
setCommandTime( nat );
}
if( ( nat->state == TR_NATPMP_RECV_PUB ) && canSendCommand( nat ) )
{
natpmpresp_t response;
const int val = readnatpmpresponseorretry( &nat->natpmp, &response );
logVal( "readnatpmpresponseorretry", val );
if( val >= 0 )
{
char str[128];
evutil_inet_ntop( AF_INET, &response.pnu.publicaddress.addr, str, sizeof( str ) );
tr_ninf( getKey( ), _( "Found public address \"%s\"" ), str );
nat->state = TR_NATPMP_IDLE;
}
else if( val != NATPMP_TRYAGAIN )
{
nat->state = TR_NATPMP_ERR;
}
}
if( ( nat->state == TR_NATPMP_IDLE ) || ( nat->state == TR_NATPMP_ERR ) )
{
if( nat->is_mapped && ( !is_enabled || ( nat->private_port != private_port ) ) )
nat->state = TR_NATPMP_SEND_UNMAP;
}
if( ( nat->state == TR_NATPMP_SEND_UNMAP ) && canSendCommand( nat ) )
{
const int val = sendnewportmappingrequest( &nat->natpmp, NATPMP_PROTOCOL_TCP,
nat->private_port,
nat->public_port,
0 );
logVal( "sendnewportmappingrequest", val );
nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_UNMAP;
setCommandTime( nat );
}
if( nat->state == TR_NATPMP_RECV_UNMAP )
{
natpmpresp_t resp;
const int val = readnatpmpresponseorretry( &nat->natpmp, &resp );
logVal( "readnatpmpresponseorretry", val );
if( val >= 0 )
{
const int private_port = resp.pnu.newportmapping.privateport;
tr_ninf( getKey( ), _( "no longer forwarding port %d" ), private_port );
if( nat->private_port == private_port )
{
nat->private_port = 0;
nat->public_port = 0;
nat->state = TR_NATPMP_IDLE;
nat->is_mapped = false;
}
}
else if( val != NATPMP_TRYAGAIN )
{
nat->state = TR_NATPMP_ERR;
}
}
if( nat->state == TR_NATPMP_IDLE )
{
if( is_enabled && !nat->is_mapped && nat->has_discovered )
nat->state = TR_NATPMP_SEND_MAP;
else if( nat->is_mapped && tr_time( ) >= nat->renew_time )
nat->state = TR_NATPMP_SEND_MAP;
}
if( ( nat->state == TR_NATPMP_SEND_MAP ) && canSendCommand( nat ) )
{
const int val = sendnewportmappingrequest( &nat->natpmp, NATPMP_PROTOCOL_TCP, private_port, private_port, LIFETIME_SECS );
logVal( "sendnewportmappingrequest", val );
nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_MAP;
setCommandTime( nat );
}
if( nat->state == TR_NATPMP_RECV_MAP )
{
natpmpresp_t resp;
const int val = readnatpmpresponseorretry( &nat->natpmp, &resp );
logVal( "readnatpmpresponseorretry", val );
if( val >= 0 )
{
nat->state = TR_NATPMP_IDLE;
nat->is_mapped = true;
nat->renew_time = tr_time( ) + ( resp.pnu.newportmapping.lifetime / 2 );
nat->private_port = resp.pnu.newportmapping.privateport;
nat->public_port = resp.pnu.newportmapping.mappedpublicport;
tr_ninf( getKey( ), _( "Port %d forwarded successfully" ), nat->private_port );
}
else if( val != NATPMP_TRYAGAIN )
{
nat->state = TR_NATPMP_ERR;
}
}
switch( nat->state )
{
case TR_NATPMP_IDLE:
*public_port = nat->public_port;
return nat->is_mapped ? TR_PORT_MAPPED : TR_PORT_UNMAPPED;
break;
case TR_NATPMP_DISCOVER:
ret = TR_PORT_UNMAPPED; break;
case TR_NATPMP_RECV_PUB:
case TR_NATPMP_SEND_MAP:
case TR_NATPMP_RECV_MAP:
ret = TR_PORT_MAPPING; break;
case TR_NATPMP_SEND_UNMAP:
case TR_NATPMP_RECV_UNMAP:
ret = TR_PORT_UNMAPPING; break;
default:
ret = TR_PORT_ERROR; break;
}
return ret;
}
int
tr_natpmpPulse( struct tr_natpmp * nat,
int port,
int isEnabled )
{
int ret;
if( isEnabled && ( nat->state == TR_NATPMP_DISCOVER ) )
{
int val = initnatpmp( &nat->natpmp );
logVal( "initnatpmp", val );
val = sendpublicaddressrequest( &nat->natpmp );
logVal( "sendpublicaddressrequest", val );
nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_PUB;
nat->hasDiscovered = 1;
setCommandTime( nat );
}
if( ( nat->state == TR_NATPMP_RECV_PUB ) && canSendCommand( nat ) )
{
natpmpresp_t response;
const int val = readnatpmpresponseorretry( &nat->natpmp,
&response );
logVal( "readnatpmpresponseorretry", val );
if( val >= 0 )
{
tr_ninf( getKey( ), _(
"Found public address \"%s\"" ),
inet_ntoa( response.pnu.publicaddress.addr ) );
nat->state = TR_NATPMP_IDLE;
}
else if( val != NATPMP_TRYAGAIN )
{
nat->state = TR_NATPMP_ERR;
}
}
if( ( nat->state == TR_NATPMP_IDLE ) || ( nat->state == TR_NATPMP_ERR ) )
{
if( nat->isMapped && ( !isEnabled || ( nat->port != port ) ) )
nat->state = TR_NATPMP_SEND_UNMAP;
}
if( ( nat->state == TR_NATPMP_SEND_UNMAP ) && canSendCommand( nat ) )
{
const int val =
sendnewportmappingrequest( &nat->natpmp, NATPMP_PROTOCOL_TCP,
nat->port, nat->port,
0 );
logVal( "sendnewportmappingrequest", val );
nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_UNMAP;
setCommandTime( nat );
}
if( nat->state == TR_NATPMP_RECV_UNMAP )
{
natpmpresp_t resp;
const int val = readnatpmpresponseorretry( &nat->natpmp, &resp );
logVal( "readnatpmpresponseorretry", val );
if( val >= 0 )
{
const int p = resp.pnu.newportmapping.privateport;
tr_ninf( getKey( ), _( "no longer forwarding port %d" ), p );
if( nat->port == p )
{
nat->port = -1;
nat->state = TR_NATPMP_IDLE;
nat->isMapped = 0;
}
}
else if( val != NATPMP_TRYAGAIN )
{
nat->state = TR_NATPMP_ERR;
}
}
if( nat->state == TR_NATPMP_IDLE )
{
if( isEnabled && !nat->isMapped && nat->hasDiscovered )
nat->state = TR_NATPMP_SEND_MAP;
else if( nat->isMapped && tr_time( ) >= nat->renewTime )
nat->state = TR_NATPMP_SEND_MAP;
}
if( ( nat->state == TR_NATPMP_SEND_MAP ) && canSendCommand( nat ) )
{
const int val =
sendnewportmappingrequest( &nat->natpmp, NATPMP_PROTOCOL_TCP,
port,
port,
LIFETIME_SECS );
logVal( "sendnewportmappingrequest", val );
nat->state = val < 0 ? TR_NATPMP_ERR : TR_NATPMP_RECV_MAP;
setCommandTime( nat );
}
if( nat->state == TR_NATPMP_RECV_MAP )
{
natpmpresp_t resp;
const int val = readnatpmpresponseorretry( &nat->natpmp, &resp );
logVal( "readnatpmpresponseorretry", val );
if( val >= 0 )
{
nat->state = TR_NATPMP_IDLE;
nat->isMapped = 1;
nat->renewTime = tr_time( ) + LIFETIME_SECS;
nat->port = resp.pnu.newportmapping.privateport;
tr_ninf( getKey( ), _(
"Port %d forwarded successfully" ), nat->port );
}
else if( val != NATPMP_TRYAGAIN )
{
nat->state = TR_NATPMP_ERR;
}
}
switch( nat->state )
{
case TR_NATPMP_IDLE:
ret = nat->isMapped ? TR_PORT_MAPPED : TR_PORT_UNMAPPED; break;
case TR_NATPMP_DISCOVER:
ret = TR_PORT_UNMAPPED; break;
case TR_NATPMP_RECV_PUB:
case TR_NATPMP_SEND_MAP:
case TR_NATPMP_RECV_MAP:
ret = TR_PORT_MAPPING; break;
case TR_NATPMP_SEND_UNMAP:
case TR_NATPMP_RECV_UNMAP:
ret = TR_PORT_UNMAPPING; break;
default:
ret = TR_PORT_ERROR; break;
}
return ret;
}
