<?php

// error logging function

function four_oh_four_handler($type, $severity)

{

// determine if the link leading to the not found page is remote or local

if (!empty($_SERVER['HTTP_REFERER'])) {

$remote_or_local = (int) preg_match("!http://[^/]*{$_SERVER['HTTP_HOST']}!", $_SERVER['HTTP_REFERER']);

} else {

$remote_or_local = 2; // direct request

}

$db = new sqlite_db("error_log");

$db->query("INSERT INTO web_errors

(host, request_url, referrer_url, user_ip,

user_browser, notes, request_method,

severity, source, time, type)

VALUES(

'".sqlite_escape_string($_SERVER['HTTP_HOST'])."',

'".sqlite_escape_string($_SERVER['REDIRECT_URL'])."',

'".sqlite_escape_string($_SERVER['HTTP_REFERER'])."',

'".sqlite_escape_string($_SERVER['REMOTE_ADDR'])."',

'".sqlite_escape_string($_SERVER['HTTP_USER_AGENT'])."',

'".sqlite_escape_string($_SERVER['REDIRECT_ERROR_NOTES'])."',

'".sqlite_escape_string($_SERVER['REDIRECT_REQUEST_METHOD'])."',

'{$severity}',

{$remote_or_local},

".time().",

'{$type}'

)

");

}

// determine what sort of an error is this

if (

!strncasecmp($_SERVER['REDIRECT_URL'], '/winnt/', strlen('/winnt/')) ||

!strncasecmp($_SERVER['REDIRECT_URL'], '/scripts/', strlen('/scripts/'))

) {

trigger_error("Yet another unpatched IIS server at '{$_SERVER['REMOTE_ADDR']}', block with firewall");

return;

}

// determine the extension of the not found page.

$extension = strtolower(substr(strrchr($_SERVER['REDIRECT_URL'], '.'), 1));

// actual error handling

switch ($extension) {

case 'php':

case 'cgi':

four_oh_four_handler('DYNAMIC', 1);

// Display a site map to the user so that

// they can find the page they are looking for.

display_site_map();

break;

case 'html':

case 'htm':

case 'shtml':

four_oh_four_handler('STATIC', 2);

display_site_map();

break;

case 'jpg':

case 'gif':

case 'png':

four_oh_four_handler('IMAGE', 3);

// to prevent ugly broken image

// redirect the request to a blank pixel image.

header("Location: /blank.gif");

return;

break;

default:

four_oh_four_handler('UNKNOWN', 4);

display_site_map();

break;

}

?>