<?php
class MinecraftRconException extends Exception
{
// Exception thrown by MinecraftRcon class
}

class MinecraftRcon
{

//
const SERVERDATA_EXECCOMMAND = 2;
const SERVERDATA_AUTH = 3;

//
const SERVERDATA_RESPONSE_VALUE = 0;
const SERVERDATA_AUTH_RESPONSE = 2;

private $Socket;
private $RequestId;

public function __destruct( )
{
$this->Disconnect( );
}

public function Connect( $Ip, $Port = 25575, $Password, $Timeout = 3 )
{
$this->RequestId = 0;

if( $this->Socket = FSockOpen( $Ip, (int)$Port ) )
{
Socket_Set_TimeOut( $this->Socket, $Timeout );

if( !$this->Auth( $Password ) )
{
$this->Disconnect( );

throw new MinecraftRconException( "Nie mozna sie polaczyc ( serwer jest wlaczony ? )" );
}
}
else
{
throw new MinecraftRconException( "Can't open socket." );
}
}

public function Disconnect( )
{
if( $this->Socket )
{
FClose( $this->Socket );

$this->Socket = null;
}
}

public function Command( $String )
{
if( !$this->WriteData( self :: SERVERDATA_EXECCOMMAND, $String ) )
{
return false;
}

$Data = $this->ReadData( );

if( $Data[ 'RequestId' ] < 1 || $Data[ 'Response' ] != self :: SERVERDATA_RESPONSE_VALUE )
{
return false;
}

return $Data[ 'String' ];
}

private function Auth( $Password )
{
if( !$this->WriteData( self :: SERVERDATA_AUTH, $Password ) )
{
return false;
}

$Data = $this->ReadData( );

return $Data[ 'RequestId' ] > -1 && $Data[ 'Response' ] == self :: SERVERDATA_AUTH_RESPONSE;
}

private function ReadData( )
{
$Packet = Array( );

$Size = FRead( $this->Socket, 4 );
$Size = UnPack( 'V1Size', $Size );
$Size = $Size[ 'Size' ];

// TODO: Add multiple packets (Source)

$Packet = FRead( $this->Socket, $Size );
$Packet = UnPack( 'V1RequestId/V1Response/a*String/a*String2', $Packet );

return $Packet;
}

private function WriteData( $Command, $String = "" )
{
// Pack the packet together
$Data = Pack( 'VV', $this->RequestId++, $Command ) . $String . "\x00\x00\x00";

// Prepend packet length
$Data = Pack( 'V', StrLen( $Data ) ) . $Data;

$Length = StrLen( $Data );

return $Length === FWrite( $this->Socket, $Data, $Length );
}
}