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171 lines (137 loc) · 3.94 KB
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<?php
/**
* Class written by xPaw
*
* Website: http://xpaw.me
* GitHub: https://github.com/xPaw/PHP-Source-Query-Class
*/
class SourceQuerySocket
{
public $Socket;
public $Engine;
public $Ip;
public $Port;
public $Timeout;
/**
* Points to buffer class
*
* @var SourceQueryBuffer
*/
private $Buffer;
public function __construct( $Buffer )
{
$this->Buffer = $Buffer;
}
public function Close( )
{
if( $this->Socket )
{
FClose( $this->Socket );
$this->Socket = null;
}
}
public function Open( $Ip, $Port, $Timeout, $Engine )
{
$this->Timeout = $Timeout;
$this->Engine = $Engine;
$this->Port = $Port;
$this->Ip = $Ip;
$this->Socket = @FSockOpen( 'udp://' . $Ip, $Port, $ErrNo, $ErrStr, $Timeout );
if( $ErrNo || $this->Socket === false )
{
throw new Exception( 'Could not create socket: ' . $ErrStr );
}
Stream_Set_Timeout( $this->Socket, $Timeout );
Stream_Set_Blocking( $this->Socket, true );
return true;
}
public function Write( $Header, $String = '' )
{
$Command = Pack( 'ccccca*', 0xFF, 0xFF, 0xFF, 0xFF, $Header, $String );
$Length = StrLen( $Command );
return $Length === FWrite( $this->Socket, $Command, $Length );
}
public function Read( $Length = 1400 )
{
$this->Buffer->Set( FRead( $this->Socket, $Length ) );
if( $this->Buffer->Remaining( ) === 0 )
{
// TODO: Should we throw an exception here?
return;
}
$Header = $this->Buffer->GetLong( );
if( $Header === -1 ) // Single packet
{
// We don't have to do anything
}
else if( $Header === -2 ) // Split packet
{
$Packets = Array( );
$IsCompressed = false;
$ReadMore = false;
do
{
$RequestID = $this->Buffer->GetLong( );
switch( $this->Engine )
{
case SourceQuery :: GOLDSOURCE:
{
$PacketCountAndNumber = $this->Buffer->GetByte( );
$PacketCount = $PacketCountAndNumber & 0xF;
$PacketNumber = $PacketCountAndNumber >> 4;
break;
}
case SourceQuery :: SOURCE:
{
$IsCompressed = ( $RequestID & 0x80000000 ) !== 0;
$PacketCount = $this->Buffer->GetByte( );
$PacketNumber = $this->Buffer->GetByte( ) + 1;
if( $IsCompressed )
{
$this->Buffer->GetLong( ); // Split size
$PacketChecksum = $this->Buffer->GetUnsignedLong( );
}
else
{
$this->Buffer->GetShort( ); // Split size
}
break;
}
}
$Packets[ $PacketNumber ] = $this->Buffer->Get( );
$ReadMore = $PacketCount > sizeof( $Packets );
}
while( $ReadMore && $this->Sherlock( $Length ) );
$Buffer = Implode( $Packets );
// TODO: Test this
if( $IsCompressed )
{
// Let's make sure this function exists, it's not included in PHP by default
if( !Function_Exists( 'bzdecompress' ) )
{
throw new RuntimeException( 'Received compressed packet, PHP doesn\'t have Bzip2 library installed, can\'t decompress.' );
}
$Data = bzdecompress( $Data );
if( CRC32( $Data ) !== $PacketChecksum )
{
throw new SourceQueryException( 'CRC32 checksum mismatch of uncompressed packet data.' );
}
}
$this->Buffer->Set( SubStr( $Buffer, 4 ) );
}
else
{
throw new SourceQueryException( 'Socket read: Raw packet header mismatch. (0x' . DecHex( $Header ) . ')' );
}
}
private function Sherlock( $Length )
{
$Data = FRead( $this->Socket, $Length );
if( StrLen( $Data ) < 4 )
{
return false;
}
$this->Buffer->Set( $Data );
return $this->Buffer->GetLong( ) === -2;
}
}