hand-made-code

finger.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<title>Registration</title>
	<script type="text/javascript" language="javascript">
// <![CDATA[

// Need to make an object of XMLHttpRequest Type.
function createRequestObject() {
    var ro;
    if (navigator.appName == "Microsoft Internet Explorer") {
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    } else {
        ro = new XMLHttpRequest();
    }
    return ro;
}
var http = createRequestObject();

// Function that calls the PHP script:
function sendRequest(domainname) {
	// Call the script.
	// Use the GET method.
	// Pass the email address in the URL.
    http.open('get', 'finger.php?domain=' + encodeURIComponent(domainname));
    http.onreadystatechange = handleResponse;
    http.send(null);
}

// Function handles the response from the PHP script.
function handleResponse() {
	// If everything's okay:
    if(http.readyState == 4){
    	// Assign the returned value to the document object.
        document.getElementById('domain_label').innerHTML = http.responseText;
    }
}
// ]]>
</script>
</head>
<body>
<form action="finger.php" method="post">
Domain: <input name="domainname" type="text" size="30" maxlength="60" 
  onkeyup="sendRequest(this.form.domainname.value)" /> <span id="domain_label"></span><br />
</form>
</body>
</html>

finder.php

<?php 

$pdolist = array('at', 'co.at', 'or.at');

if (isset($_GET['domain'])) {  
  foreach ($pdolist as $pdo) {
    $domain = $_GET['domain'].'.'.$pdo;
	  $r = finger($domain);	
	  $text = ( $r == 0 ) ? "occupied" : "free" ; 
	  printf("<br> %s [%s]", $domain, $text);
	}
}

function finger($domain) {
  $fp = fsockopen('finger.nic.at', 79);
  $domain .= "\n";
  fputs($fp, $domain, strlen($domain));
  $text = fgets($fp);
  fclose($fp);
  if (preg_match  ('/NO domain data/', $text)) {
     return 1;
   } else {
     return 0;
   }
}
?>