index.php at Datum Whois

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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
	<head>
		<title>Datum Whois Domain Ownership lookup tool</title>
		<meta http-equiv="Content-Language" content="en-us" />
		<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
		<meta name="description" content="Whois Domain Ownership lookup tool" />
		<meta name="keywords" content="whois, domain ownership" />
		<link href="main.css" rel="stylesheet" type="text/css" />
	</head>
	<body>

		<div align="center">

			<div id="container">

				<div id="header">
					<a href="http://www.whois.datum-forensics.com"><img src="images/logo.png" width="363" height="100" border="0" style="border:none;" alt="" /></a>
				</div>

				<div id="searchContainer">
					<form action="index.php" method="get">
						<input type="text" name="ip" size="38" />
						<input type="submit" value="Whois This" />
					</form>
				</div>

				<div id="content">

										<?php
						$cmd = get_whois_cmd();
						if ( isset($_GET['ip']) )
						{
							$ip=$_GET['ip'];
							echo get_whois($cmd, $ip);
						}

						function get_whois_cmd()
						{
							if (file_exists('/usr/local/bin/whois'))
							{
								$cmd = '/usr/local/bin/whois';
							}
							elseif (file_exists('/usr/bin/whois'))
							{
								$cmd = '/usr/bin/whois';
							}
							elseif (file_exists('/bin/whois'))
							{
								$cmd = '/bin/whois';
							}
							else
							{
								die("<h1>Error:</h1>\n<p>Couldn't locate the 'whois' program.</p>");
							}

							return $cmd;
						}

						function get_whois($cmd, $domain)
						{
							if(trim($domain) !== '')
							{
								if (checkdnsrr($domain))
								{
									$result = nl2br(shell_exec(escapeshellcmd($cmd ." ". $domain)));
								}
								else
								{
									$result = '<font color="blue">Domain not registered!</font>';
								}
							}
							else
							{
								$result = '<font color="blue">Error: Empty domain name.</font>';
							}

							return $result;
						}

					?>
				</div>

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