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Intelligent 404 Handler
track.php
Author: Sarah King
This script detects the type of file that was requested and
outputs accordingly.
A broken image can cause infinite looping if the redirect
page also calls the missing image
This script will email the administrator the first time the
error is encountered.
The filename is then recorded.
Hackers, search engine indexers and link checkers will
request pages which don't exist and therefore you don't
want to be alerted every time someone calls the page,
just the first time.
The Useragent and IP information is provided so that you can
determine if the bad page
was from a broken link, a bot or a hacker. If you suspect
action from a hacker tighten security straight away.
Your server will "throw" different error codes depending on
the problem. You may want to add code to handle each type of
error.
Errors in Client
400 Bad syntax
401 Unauthorized
402 Not Used (Payment Granted)
403 Forbidden
404 Not Found
Errors in Server
500 Internal Error
501 Not Implemented
502 Overloaded
503 Gateway Timeout
To call the scripts add the following to your .htaccess file.
ErrorDocument 404 /track.php
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<?php
//choose the record either of the following statements
//depending on what your host provides
$file404 = $_SERVER['REDIRECT_ERROR_NOTES']."\n";
//or
$file404 = $_SERVER['REDIRECT_URL'] . "\n";
$filename = '/var/users/mysite/htdocs/history404.txt';
if (file_exists($filename))
{
$filecontents = file($filename);
$add = (!in_array($file404, $filecontents));
}
else $add = true;
if ($add)
{
$fp = fopen($filename, 'a');
$write = fputs($fp, $file404);
fclose($fp);
$body = '';
$reportvars = array('REDIRECT_ERROR_NOTES','HTTP_HOST', 'HTTP_REFERER', 'HTTP_USER_AGENT', 'HTTP_FROM',
'REDIRECT_URL', 'REDIRECT_REQUEST_METHOD', 'REDIRECT_STATUS','REQUEST_URI','QUERY_STRING',
'REMOTE_ADDR', 'REMOTE_PORT');
foreach($reportvars as $key) $body .= "$key: {$_SERVER[$key]}\n";
mail('webmaster@mysite.com','404:' . $_SERVER['REDIRECT_URL'],$body);
}
$revbits = explode('.',strrev($_SERVER['REDIRECT_URL']));
$pages['html'] = array('html','htm','php','txt');
$pages['special'] = array('css', 'js');
$ext = strrev($revbits[0]);
if (in_array($ext, $pages['html']))
{
// or show a make a comment form
header('Location: /index.php');
}
elseif (in_array($ext, $pages['special']))
{
//output nothing
echo '';
}
else
{
//throw a large image onto the screen so it's easy to hunt down.
//change the width and height to a more discreet dimension when live
//although if the img has height and width attributes that will overrule
//the width and height here
$width = 50;
$height = 50;
$image = ImageCreate($width,$height);
$blob = ImageColorAllocate($image,27,48,107);
if (function_exists("imagegif")) {
header ("Content-type: image/gif");
imagegif ($image);
}
elseif (function_exists("imagejpeg")) {
header ("Content-type: image/jpeg");
imagejpeg ($image, "", 0.5);
}
elseif (function_exists("imagepng")) {
header ("Content-type: image/png");
imagepng ($image);
}
elseif (function_exists("imagewbmp")) {
header ("Content-type: image/vnd.wap.wbmp");
imagewbmp ($image);
}
else
// or whatever action should be taken if you don't have GD installed.
die("No image support in this PHP server");
ImageDestroy($image);
}
?> | |
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