Querying a server using PHP

[Psychosis]

lib/class_ValveSourceServer.php

PHP Code:

<?PHP
class ValveSourceServer
{
    var $srv;
    var $port;

    function ValveSourceServer()
    {
        define("A2S_SERVERQUERY_GETCHALLENGE", "\xFF\xFF\xFF\xFF\x57");
        // get the challenge !
        define("A2S_INFO", "\xFF\xFF\xFF\xFF\x54\x53\x6F\x75\x72\x63\x65\x20\x45\x6E\x67\x69\x6E\x65\x20\x51​\x75\x65\x72\x79\x00");
        define("A2S_PLAYER", "\xFF\xFF\xFF\xFF\x55"); // requires Challenge suffix to work
        define("A2S_RULES", "\xFF\xFF\xFF\xFF\x56"); // requires Challenge suffix to work
        
        
    }
    function ConnectToServer($server,$portno)
    {
        $this->srv=$server;
        $this->port=$portno;
        $this->A2S_connect();
    }
    
    function Disconnect()
    {
        $this->A2S_close();
    }
    function _getchallenge()
    {
        $data = $this->A2S_query(A2S_SERVERQUERY_GETCHALLENGE);
        return substr($data,5);
    }
    function readString($string, &$i) {
     $begin = $i;
     $strlen = strlen($string);
     for ($i; ($i < $strlen) && ($string{$i} != chr(0)); $i++);
     $result = substr($string, $begin, $i-$begin);
     $i++;
     
     return $result;
  }

    function A2S_connect()
    {
        $this->connection = fsockopen("udp://".$this->srv, $this->port, $errorno, $errorstr, 1);
        if(!$this->connection){ die("ERROR: $errorno $errorstr"); }
        
    }
    function A2S_query($query)
    { 
        fwrite($this->connection, $query, strlen($query));
        return fread($this->connection, 4096);
    }
    function A2S_players()
    {
        $challenge = $this->_getchallenge();
            
        $buffer = $this->A2S_query(A2S_PLAYER.$challenge);
        $i = 5;
         $num_players = ord($buffer{$i++});
     
         if($num_players > 0) {
               for($p = 0; $p < $num_players; $p++) {
                   if(!empty($buffer{$i+1})) {
                  $data[$p]['index'] = ord($buffer{$i++});
                  $data[$p]['name'] = $this->readString($buffer, $i);
              
                  $frags = unpack("L", substr($buffer, $i, $i+4)); $i+=4;
                  $data[$p]['frags'] = $frags[1];
              
                  $time = unpack("f", substr($buffer, $i, $i+4)); $i+=4;
                  $time = mktime(0, 0, $time[1]);
                  $time = date("H:i:s", $time);
                  $data[$p]['time'] = $time;
           }
        }  
     }    
     return $data;
    }
    function A2S_info()
    {
        $buffer    =    $this->A2S_query(A2S_INFO);
        $i         = 5;
        $data    =    array();
        $data['netver']        =    ord($buffer{$i++});
        $data['hostname']    =    $this->readString($buffer, $i);
        $data['map']        =    $this->readString($buffer, $i);
        $data['game']        =    $this->readString($buffer, $i);
        $data['desc']        =    $this->readString($buffer, $i);
        $temp                =    unpack("S",$buffer{$i++}.$buffer{$i++});
        $data['appid']        =    $temp[1];
        $data['players']    =    ord($buffer{$i++});
        $data['maxplayers']    =    ord($buffer{$i++});
        $data['bots']        =    ord($buffer{$i++});
        $data['dedicated']    =    ord($buffer{$i++});
        $data['os']            =    $buffer{$i++};
        $data['pwd']        =    ord($buffer{$i++});
        $data['vac']        =    ord($buffer{$i++});
        $data['appver']        =    $this->readString($buffer, $i);
        
        return $data;
    }
    function A2S_close()
    {
        fclose($this->connection);
    }
    
}

?>

servertable.php

PHP Code:

<?PHP
    
    include 'lib/open_database.php';
    include 'lib/class_ValveSourceServer.php';
    
    function PrintServerInfo($server,$port){
        $ValveSourceServer = new ValveSourceServer();
        $ValveSourceServer->ConnectToServer($server,$port);
        
        $_player_array = $ValveSourceServer->A2S_players();
        $_data = $ValveSourceServer->A2S_Info();
        
        $ValveSourceServer->Disconnect();
        
        $server = gethostbyaddr(gethostbyname($server));
        
        $_hostname=$_data['hostname'];
        $_playercount=count($_player_array);
        $_map=$_data['map'];
        $_gamemode=$_data['desc'];
        
        /*foreach($_player_array as $_player){
            $_playername = $_player['name'];
            $_playerscore = $_player['frags'];
            $_playertime = $_player['time'];
            
        }*/
        
        //print_r($_player_array);
            
        echo "<tr><td bgcolor=\"#eeeeee\">".$_hostname."</td>";
        echo "<td>".$server.":".$port."</td>";
        echo "<td>".$_playercount."</td>";
        echo "<td>".$_map."</td>";
        echo "<td>".$_gamemode."</td></tr>";
        
    }
    
    function PrintAllServerInfo(){
        $query = "SELECT * from `bluorb`.`servers` ORDER BY `Game`;";
        $SQL_result=mysql_query($query);
        $_lastgame="";
        
        while($row = mysql_fetch_assoc($SQL_result)){
            if($row['GameEngine']=="sourceengine"){
                echo "Printing Server info for ".$row['IP'].":".$row['Port']."\n";
                if (($row['Game'] !== $_lastgame) || ($_lastgame="")){
                    if($_lastgame !== ""){
                        printf("</table></div>");
                    }
                    $_game=$row['Game'];
                    echo '<div class="file_table"><table border="0" width="100%" cellspacing="0" cellpadding="0" class="files"><tr><td bgcolor="#eeeeee"><a href=/games/'.str_replace(' ','_',$_game).'.php><strong>'.$_game.'</strong></a></td> <td bgcolor="#eeeeee"><strong>Server Address</strong></td><td bgcolor="#eeeeee"><strong>Players</strong></td><td bgcolor="#eeeeee"><strong>Map</strong></td><td bgcolor="#eeeeee"><strong>Game Mode</strong></td></tr>';
                }    
                PrintServerInfo($row['IP'],$row['Port']);
            }
            $_lastgame=$row['Game'];
        }//WHILE
        printf("</table></div>");
    
    }

    PrintAllServerInfo(); 


It works as intended, but why is it so slow??

[Psychosis]

anyone?

[css]

What do you mean by slow? A second, two seconds or ten seconds?

My guess is that it's about two or three seconds and it's because

Code:

$server = gethostbyaddr(gethostbyname($server));

doesn't resolve to any hostname and it takes couple seconds for DNS check to fail.

[Psychosis]

even without that line it takes about 15 seconds per server for me.

[Psychosis]

hmm... it seems to be down to 2 now for some reason.