include "globals.inc";
include "config.inc";
$page_info = <<<eod<br># ----------------------------------------------------------------------------------------------------------------------
# SquidGuard error page generator
# (C)2006-2007 Serg Dvoriancev
# ----------------------------------------------------------------------------------------------------------------------
# This programm processed redirection to specified URL or generated error page for standart HTTP error code.
# Redirection supported http and https protocols.
# ----------------------------------------------------------------------------------------------------------------------
# Format:
# sgerror.php?url=[http://myurl]or[https://myurl]or[error_code[space_code]output-message][incoming SquidGuard variables]
# Incoming SquidGuard variables:
# a=client_address
# n=client_name
# i=client_user
# s=client_group
# t=target_group
# u=client_url
# Example:
# sgerror.php?url=http://myurl.com&a=..&n=..&i=..&s=..&t=..&u=..
# sgerror.php?url=https://myurl.com&a=..&n=..&i=..&s=..&t=..&u=..
# sgerror.php?url=404%20output-message&a=..&n=..&i=..&s=..&t=..&u=..
# ----------------------------------------------------------------------------------------------------------------------
# Tags:
# myurl and output messages can include Tags
# [a] - client address
# [n] - client name
# [i] - client user
# [s] - client group
# [t] - target group
# [u] - client url
# Example:
# sgerror.php?url=401 Unauthorized access to URL [u] for client [n]
# sgerror.php?url=http://my_error_page.php?cladr=%5Ba%5D&clname=%5Bn%5D // %5b=[ %d=]
# ----------------------------------------------------------------------------------------------------------------------
# Special Tags:
# blank - get blank page
# blank_img - get one-pixel transparent image (for replace banners and etc.)
# Example:
# sgerror.php?url=blank
# sgerror.php?url=blank_img
# ----------------------------------------------------------------------------------------------------------------------
EOD;
define('ACTION_URL', 'url');
define('ACTION_RES', 'res');
define('ACTION_MSG', 'msg');
define('TAG_BLANK', 'blank');
define('TAG_BLANK_IMG', 'blank_img');
# ----------------------------------------------------------------------------------------------------------------------
# ?url=EMPTY_IMG
# Use this options for replace baners/ads to transparent picture. Thisbetter for viewing.
# ----------------------------------------------------------------------------------------------------------------------
# NULL GIF file
# HEX: 47 49 46 38 39 61 - - -
# SYM: G I F 8 9 a 01 00 | 01 00 80 00 00 FF FF FF | 00 00 00 2C 00 00 00 00 | 01 00 01 00 00 02 02 44 | 01 00 3B
# ----------------------------------------------------------------------------------------------------------------------
define(GIF_BODY, "GIF89a\x01\x00\x01\x00\x80\x00\x00\xFF\xFF\xFF\x00\x00\x00\x2C\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x44\x01\x00\x3B");
$url = '';
$msg = '';
$cl = Array(); // squidGuard variables: %a %n %i %s %t %u
$err_code = array();
$err_code[301] = "301 Moved Permanently";
$err_code[302] = "302 Found";
$err_code[303] = "303 See Other";
$err_code[305] = "305 Use Proxy";
$err_code[400] = "400 Bad Request";
$err_code[401] = "401 Unauthorized";
$err_code[402] = "402 Payment Required";
$err_code[403] = "403 Forbidden";
$err_code[404] = "404 Not Found";
$err_code[405] = "405 Method Not Allowed";
$err_code[406] = "406 Not Acceptable";
$err_code[407] = "407 Proxy Authentication Required";
$err_code[408] = "408 Request Time-out";
$err_code[409] = "409 Conflict";
$err_code[410] = "410 Gone";
$err_code[411] = "411 Length Required";
$err_code[412] = "412 Precondition Failed";
$err_code[413] = "413 Request Entity Too Large";
$err_code[414] = "414 Request-URI Too Large";
$err_code[415] = "415 Unsupported Media Type";
$err_code[416] = "416 Requested range not satisfiable";
$err_code[417] = "417 Expectation Failed";
$err_code[500] = "500 Internal Server Error";
$err_code[501] = "501 Not Implemented";
$err_code[502] = "502 Bad Gateway";
$err_code[503] = "503 Service Unavailable";
$err_code[504] = "504 Gateway Time-out";
$err_code[505] = "505 HTTP Version not supported";
# ----------------------------------------------------------------------------------------------------------------------
# check arg's
# ----------------------------------------------------------------------------------------------------------------------
if (count($_POST)) {
$url = trim($_POST['url']);
$msg = $_POST['msg'];
$cl['a'] = $_POST['a'];
$cl['n'] = $_POST['n'];
$cl['i'] = $_POST['i'];
$cl['s'] = $_POST['s'];
$cl['t'] = $_POST['t'];
$cl['u'] = $_POST['u'];
}
elseif (count($_GET)) {
$url = trim($_GET['url']);
$msg = $_GET['msg'];
$cl['a'] = $_GET['a'];
$cl['n'] = $_GET['n'];
$cl['i'] = $_GET['i'];
$cl['s'] = $_GET['s'];
$cl['t'] = $_GET['t'];
$cl['u'] = $_GET['u'];
}
else {
# Show 'About page'
echo get_page(get_about());
exit();
}
# ----------------------------------------------------------------------------------------------------------------------
# url's
# ----------------------------------------------------------------------------------------------------------------------
if ($url) {
$err_id = 0;
// check error code
foreach ($err_code as $key => $val) {
if (strpos(strtolower($url), strval($key)) === 0) {
$err_id = $key;
break;
}
}
# blank page
if ($url === TAG_BLANK) {
echo get_page('');
}
# blank image
elseif ($url === TAG_BLANK_IMG) {
$msg = trim($msg);
if(strpos($msg, "maxlen_") !== false) {
$maxlen = intval(trim(str_replace("maxlen_", "", $url)));
filter_by_image_size($cl['u'], $maxlen);
exit();
}
else {
# --------------------------------------------------------------
# return blank image
# --------------------------------------------------------------
header("Content-Type: image/gif;"); // charset=windows-1251");
echo GIF_BODY;
}
}
# error code
elseif ($err_id !== 0) {
$er_msg = strstr($_GET['url'], ' ');
echo get_error_page($err_id, $er_msg);
}
# redirect url
elseif ((strpos(strtolower($url), "http://") === 0) or (strpos(strtolower($url), "https://") === 0)) {
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# redirect to specified url
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
header("HTTP/1.0");
header("Location: $url", '', 302);
}
// error arguments
else {
echo get_page("sgerror: error arguments $url");
}
}
else {
echo get_page($_SERVER['QUERY_STRING']); //$url . implode(" ", $_GET));
# echo get_error_page(500);
}
# ~~~~~~~~~~
# Exit
# ~~~~~~~~~~
exit();
# ----------------------------------------------------------------------------------------------------------------------
# functions
# ----------------------------------------------------------------------------------------------------------------------
function get_page($body) {
$str = Array();
$str[] = '';
$str[] = "\n$body\n";
$str[] = '';
return implode("\n", $str);
}
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# IE displayed self-page, if them size > 1024
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
function get_error_page($er_code_id, $err_msg='') {
global $err_code;
global $cl;
global $g;
global $config;
$str = Array();
header("HTTP/1.1 " . $err_code[$er_code_id]);
$str[] = '';
$str[] = '';
if ($config['installedpackages']['squidguarddefault']['config'][0]['deniedmessage']) {
$str[] = "
### {$config['installedpackages']['squidguarddefault']['config'][0]['deniedmessage']}: {$err_code[$er_code_id]}
";
} else {
$str[] = "
### Request denied by {$g['product_name']} proxy: {$err_code[$er_code_id]}
";
}
if ($err_msg) $str[] = " **Reason:** $err_msg";
$str[] = '
* * *
';
if ($cl['a']) $str[] = " **Client address:** {$cl['a']}
";
if ($cl['n']) $str[] = " **Client name:** {$cl['n']}
";
if ($cl['i']) $str[] = " **Client user:** {$cl['i']}
";
if ($cl['s']) $str[] = " **Client group:** {$cl['s']}
";
if ($cl['t']) $str[] = " **Target group:** {$cl['t']}
";
if ($cl['u']) $str[] = " **URL:** {$cl['u']}
";
$str[] = '
* * *
';
$str[] = "";
$str[] = "";
return implode("\n", $str);
}
function get_about() {
global $err_code;
global $page_info;
$str = Array();
// about info
$s = str_replace("\n", "
", $page_info);
$str[] = $s;
$str[] = "
";
$str[] = '';
$str[] = ' **HTTP error codes (ERROR_CODE):';
foreach($err_code as $val) {
$str []= "**
| $val";
}
$str[] = ' |
**';
return implode("\n", $str);
}
function filter_by_image_size($url, $val_size) {
# load url header
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$hd = curl_exec($ch);
curl_close($ch);
$size = 0;
$SKEY = "content-length:";
$s_tmp = strtolower($hd);
$s_tmp = str_replace("\n", " ", $s_tmp); # replace all "\n"
if (strpos($s_tmp, $SKEY) !== false) {
$s_tmp = trim(substr($s_tmp, strpos($s_tmp, $SKEY) + strlen($SKEY)));
$s_tmp = trim(substr($s_tmp, 0, strpos($s_tmp, " ")));
if (is_numeric($s_tmp))
$size = intval($s_tmp);
else $size = 0;
}
# === check url type and content size ===
# redirect to specified url
if (($size !== 0) && ($size < $val_size)) {
header("HTTP/1.0");
header("Location: $url", '', 302);
}
# return blank image
else {
header("Content-Type: image/gif;");
echo GIF_BODY;
}
}
?>
[/u][/u][/s][/i]**</eod<br>
