ip-returner/index.php

<?php

$config = include('config.php');

// Define method by get parameter
if(empty($_GET)) {
  $method = "simple";
} else {
  $method = $_GET['m'];
}

if($method === "simple") {  // simple
  echo $_SERVER['REMOTE_ADDR'] . "\n";
} elseif($method === "detailed" ) {  // detailed
  readheader("REMOTE_ADDR");
  readheader("HTTP_X_FORWARDED_FOR");
  readheader("HTTP_USER_AGENT");
  readheader("HTTP_CLIENT_IP");
  readheader("HTTP_X_FORWARDED");
  readheader("HTTP_FORWARDED_FOR");
  readheader("HTTP_FORWARDED");
  readheader("HTTP_HOST");
  readheader("HTTP_URI");
  $hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
  echo "<br />";
  echo "<strong>HOSTNAME</strong>: " . $hostname;
  echo "<br />";
  echo "<strong>IPv4 REVERSE LOOKUP</strong>: " . implode(', ', gethostbynamel($hostname));
  echo "<br /><br /><strong>WHOIS:</strong>";
  $whois = shell_exec("whois " . $_SERVER['REMOTE_ADDR']);
  echo "<pre>"; print_r($whois); echo "</pre>";
  echo "<br />";

  echo "<br /><hr /><br />";
  echo 'Plain IP address: <a href="//'.$config->ip4domain.'">IPv4</a> | <a href="//'.$config->ip6domain.'">IPv6</a>';
  echo "<br />";
  echo 'Detailed header info: <a href="//'.$config->ip4domain.'/'.$config->detailed_uri.'">IPv4</a> | <a href="//'.$config->ip6domain.'/'.$config->detailed_uri.'">IPv6</a>';
} else { // wrong URL
  header("HTTP/1.1 301 Moved Permanently");
  header("Location:/".$config->detailed_uri."");
  exit;
}

function readheader($value)
{
  echo "<strong>" . $value . "</strong>: "; // show desired value 
  if(isset($_SERVER[$value])) {   // only if desired header has been delivered 
    echo $_SERVER[$value];
  }
  echo "<br />";
}

?>