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<?php
/**********************************************************************************
* QueryString.php *
***********************************************************************************
* SMF: Simple Machines Forum *
* Open-Source Project Inspired by Zef Hemel (zef@zefhemel.com) *
* =============================================================================== *
* Software Version: SMF 1.1.13 *
* Software by: Simple Machines (http://www.simplemachines.org) *
* Copyright 2006-2009 by: Simple Machines LLC (http://www.simplemachines.org) *
* 2001-2006 by: Lewis Media (http://www.lewismedia.com) *
* Support, News, Updates at: http://www.simplemachines.org *
***********************************************************************************
* This program is free software; you may redistribute it and/or modify it under *
* the terms of the provided license as published by Simple Machines LLC. *
* *
* This program is distributed in the hope that it is and will be useful, but *
* WITHOUT ANY WARRANTIES; without even any implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* See the "license.txt" file for details of the Simple Machines license. *
* The latest version can always be found at http://www.simplemachines.org. *
**********************************************************************************/
if (!defined('SMF'))
die('Hacking attempt...');
/* This file does a lot of important stuff. Mainly, this means it handles
the query string, request variables, and session management. It contains
the following functions:
void cleanRequest()
- cleans the request variables (ENV, GET, POST, COOKIE, SERVER) and
makes sure the query string was parsed correctly.
- handles the URLs passed by the queryless URLs option.
- makes sure, regardless of php.ini, everything has slashes.
- sets up $board, $topic, and $scripturl and $_REQUEST['start'].
- determines, or rather tries to determine, the client's IP.
array addslashes__recursive(array var)
- returns the var, as an array or string, with slashes.
- importantly adds slashes to keys and values!
- calls itself recursively if necessary.
array htmlspecialchars__recursive(array var)
- adds entities (", <, >) to the array or string var.
- importantly, does not effect keys, only values.
- calls itself recursively if necessary.
array urldecode__recursive(array var)
- takes off url encoding (%20, etc.) from the array or string var.
- importantly, does it to keys too!
- calls itself recursively if there are any sub arrays.
array stripslashes__recursive(array var)
- removes slashes, recursively, from the array or string var.
- effects both keys and values of arrays.
- calls itself recursively to handle arrays of arrays.
array htmltrim__recursive(array var)
- trims a string or an the var array using html characters as well.
- does not effect keys, only values.
- may call itself recursively if needed.
array validate_unicode__recursive(array var)
- makes sure a string only contains character which are allowed in
XML/XHTML (not 0-8, 11, 12, and 14-31.)
- tries to handle UTF-8 properly, and shouldn't negatively affect
character sets like ISO-8859-1.
- does not effect keys, only changes values.
- may call itself recursively if necessary.
string ob_sessrewrite(string buffer)
- rewrites the URLs outputted to have the session ID, if the user
is not accepting cookies and is using a standard web browser.
- handles rewriting URLs for the queryless URLs option.
- can be turned off entirely by setting $scripturl to an empty
string, ''. (it wouldn't work well like that anyway.)
- because of bugs in certain builds of PHP, does not function in
versions lower than 4.3.0 - please upgrade if this hurts you.
*/
// Clean the request variables - add html entities to GET and slashes if magic_quotes_gpc is Off.
function cleanRequest()
{
global $board, $topic, $boardurl, $scripturl, $modSettings;
// Makes it easier to refer to things this way.
$scripturl = $boardurl . '/index.php';
// Save some memory.. (since we don't use these anyway.)
unset($GLOBALS['HTTP_POST_VARS'], $GLOBALS['HTTP_POST_VARS']);
unset($GLOBALS['HTTP_POST_FILES'], $GLOBALS['HTTP_POST_FILES']);
// These keys shouldn't be set...ever.
if (isset($_REQUEST['GLOBALS']) || isset($_COOKIE['GLOBALS']))
die('Invalid request variable.');
// Same goes for numeric keys.
foreach (array_merge(array_keys($_POST), array_keys($_GET), array_keys($_FILES)) as $key)
if (is_numeric($key))
die('Invalid request variable.');
// Numeric keys in cookies are less of a problem. Just unset those.
foreach ($_COOKIE as $key => $value)
if (is_numeric($key))
unset($_COOKIE[$key]);
// Get the correct query string. It may be in an environment variable...
if (!isset($_SERVER['QUERY_STRING']))
$_SERVER['QUERY_STRING'] = getenv('QUERY_STRING');
// Are we going to need to parse the ; out?
if ((strpos(@ini_get('arg_separator.input'), ';') === false || @version_compare(PHP_VERSION, '4.2.0') == -1) && !empty($_SERVER['QUERY_STRING']))
{
// Get rid of the old one! You don't know where it's been!
$_GET = array();
// Was this redirected? If so, get the REDIRECT_QUERY_STRING.
$_SERVER['QUERY_STRING'] = urldecode(substr($_SERVER['QUERY_STRING'], 0, 5) == 'url=/' ? $_SERVER['REDIRECT_QUERY_STRING'] : $_SERVER['QUERY_STRING']);
// Replace ';' with '&' and '&something&' with '&something=&'. (this is done for compatibility...)
// !!! smflib
parse_str(preg_replace('/&(\w+)(?=&|$)/', '&$1=', strtr($_SERVER['QUERY_STRING'], array(';?' => '&', ';' => '&', '%00' => '', "\0" => ''))), $_GET);
}
elseif (strpos(@ini_get('arg_separator.input'), ';') !== false)
{
$_GET = urldecode__recursive($_GET);
if (@get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
$_GET = stripslashes__recursive($_GET);
// Search engines will send action=profile%3Bu=1, which confuses PHP.
// !!! smflib
foreach ($_GET as $k => $v)
{
if (is_string($v) && strpos($k, ';') !== false)
{
$temp = explode(';', $v);
$_GET[$k] = $temp[0];
for ($i = 1, $n = count($temp); $i < $n; $i++)
{
@list ($key, $val) = @explode('=', $temp[$i], 2);
if (!isset($_GET[$key]))
$_GET[$key] = $val;
}
}
// This helps a lot with integration!
if (strpos($k, '?') === 0)
{
$_GET[substr($k, 1)] = $v;
unset($_GET[$k]);
}
}
}
// There's no query string, but there is a URL... try to get the data from there.
if (!empty($_SERVER['REQUEST_URI']))
{
// Remove the .html, assuming there is one.
if (substr($_SERVER['REQUEST_URI'], strrpos($_SERVER['REQUEST_URI'], '.'), 4) == '.htm')
$request = substr($_SERVER['REQUEST_URI'], 0, strrpos($_SERVER['REQUEST_URI'], '.'));
else
$request = $_SERVER['REQUEST_URI'];
// Replace 'index.php/a,b,c/d/e,f' with 'a=b,c&d=&e=f' and parse it into $_GET.
parse_str(substr(preg_replace('/&(\w+)(?=&|$)/', '&$1=', strtr(preg_replace('~/([^,/]+),~', '/$1=', substr($request, strpos($request, basename($scripturl)) + strlen(basename($scripturl)))), '/', '&')), 1), $temp);
$_GET += $temp;
}
// Add entities to GET. This is kinda like the slashes on everything else.
$_GET = addslashes__recursive(htmlspecialchars__recursive($_GET));
// Clean up after annoying ini settings. (magic_quotes_gpc might be off...)
if (@get_magic_quotes_gpc() == 0 && empty($modSettings['integrate_magic_quotes']))
{
// E(G)PCS: ENV, (GET was already done), POST, COOKIE.
$_ENV = addslashes__recursive($_ENV);
$_POST = addslashes__recursive($_POST);
$_COOKIE = addslashes__recursive($_COOKIE);
// FILES work like this: k -> name -> array. So be careful.
foreach ($_FILES as $k => $dummy)
$_FILES[$k]['name'] = addslashes__recursive($_FILES[$k]['name']);
}
// Take care of the server variables.
$_SERVER = addslashes__recursive($_SERVER);
// Let's not depend on the ini settings... why even have COOKIE in there, anyway?
$_REQUEST = $_POST + $_GET;
// Make sure $board and $topic are numbers.
if (isset($_REQUEST['board']))
{
// Make sure that its a string and not something else like an array
$_REQUEST['board'] = (string) $_REQUEST['board'];
// If there's a slash in it, we've got a start value! (old, compatible links.)
if (strpos($_REQUEST['board'], '/') !== false)
list ($_REQUEST['board'], $_REQUEST['start']) = explode('/', $_REQUEST['board']);
// Same idea, but dots. This is the currently used format - ?board=1.0...
elseif (strpos($_REQUEST['board'], '.') !== false)
list ($_REQUEST['board'], $_REQUEST['start']) = explode('.', $_REQUEST['board']);
// Now make absolutely sure it's a number.
$board = (int) $_REQUEST['board'];
$_REQUEST['start'] = isset($_REQUEST['start']) ? (int) $_REQUEST['start'] : 0;
// This is for "Who's Online" because it might come via POST - and it should be an int here.
$_GET['board'] = $board;
}
// Well, $board is going to be a number no matter what.
else
$board = 0;
// If there's a threadid, it's probably an old YaBB SE link. Flow with it.
if (isset($_REQUEST['threadid']) && !isset($_REQUEST['topic']))
$_REQUEST['topic'] = $_REQUEST['threadid'];
// We've got topic!
if (isset($_REQUEST['topic']))
{
// Make sure that its a string and not something else like an array
$_REQUEST['topic'] = (string)$_REQUEST['topic'];
// Slash means old, beta style, formatting. That's okay though, the link should still work.
if (strpos($_REQUEST['topic'], '/') !== false)
list ($_REQUEST['topic'], $_REQUEST['start']) = explode('/', $_REQUEST['topic']);
// Dots are useful and fun ;). This is ?topic=1.15.
elseif (strpos($_REQUEST['topic'], '.') !== false)
list ($_REQUEST['topic'], $_REQUEST['start']) = explode('.', $_REQUEST['topic']);
$topic = (int) $_REQUEST['topic'];
// Now make sure the online log gets the right number.
$_GET['topic'] = $topic;
}
else
$topic = 0;
// There should be a $_REQUEST['start'], some at least. If you need to default to other than 0, use $_GET['start'].
if (empty($_REQUEST['start']) || $_REQUEST['start'] < 0 || (int) $_REQUEST['start'] > 2147473647)
$_REQUEST['start'] = 0;
// The action needs to be a string and not an array or anything else
if (isset($_REQUEST['action']))
$_REQUEST['action'] = (string) $_REQUEST['action'];
if (isset($_GET['action']))
$_GET['action'] = (string) $_GET['action'];
// Store the REMOTE_ADDR for later - even though we HOPE to never use it...
$_SERVER['BAN_CHECK_IP'] = isset($_SERVER['REMOTE_ADDR']) && preg_match('~^((([1]?\d)?\d|2[0-4]\d|25[0-5])\.){3}(([1]?\d)?\d|2[0-4]\d|25[0-5])$~', $_SERVER['REMOTE_ADDR']) === 1 ? $_SERVER['REMOTE_ADDR'] : 'unknown';
// Find the user's IP address. (but don't let it give you 'unknown'!)
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_CLIENT_IP']) && (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_CLIENT_IP']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0))
{
// We have both forwarded for AND client IP... check the first forwarded for as the block - only switch if it's better that way.
if (strtok($_SERVER['HTTP_X_FORWARDED_FOR'], '.') != strtok($_SERVER['HTTP_CLIENT_IP'], '.') && '.' . strtok($_SERVER['HTTP_X_FORWARDED_FOR'], '.') == strrchr($_SERVER['HTTP_CLIENT_IP'], '.') && (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_X_FORWARDED_FOR']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0))
$_SERVER['REMOTE_ADDR'] = implode('.', array_reverse(explode('.', $_SERVER['HTTP_CLIENT_IP'])));
else
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CLIENT_IP'];
}
if (!empty($_SERVER['HTTP_CLIENT_IP']) && (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_CLIENT_IP']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0))
{
// Since they are in different blocks, it's probably reversed.
if (strtok($_SERVER['REMOTE_ADDR'], '.') != strtok($_SERVER['HTTP_CLIENT_IP'], '.'))
$_SERVER['REMOTE_ADDR'] = implode('.', array_reverse(explode('.', $_SERVER['HTTP_CLIENT_IP'])));
else
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
{
// If there are commas, get the last one.. probably.
if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',') !== false)
{
$ips = array_reverse(explode(', ', $_SERVER['HTTP_X_FORWARDED_FOR']));
// Go through each IP...
foreach ($ips as $i => $ip)
{
// Make sure it's in a valid range...
if (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $ip) != 0 && preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) == 0)
continue;
// Otherwise, we've got an IP!
$_SERVER['REMOTE_ADDR'] = trim($ip);
break;
}
}
// Otherwise just use the only one.
elseif (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_X_FORWARDED_FOR']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0)
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
elseif (!isset($_SERVER['REMOTE_ADDR']))
{
$_SERVER['REMOTE_ADDR'] = '';
// A new magic variable to indicate we think this is command line.
$_SERVER['is_cli'] = true;
}
// Make sure we know the URL of the current request.
if (empty($_SERVER['REQUEST_URI']))
$_SERVER['REQUEST_URL'] = $scripturl . (!empty($_SERVER['QUERY_STRING']) ? '?' . $_SERVER['QUERY_STRING'] : '');
elseif (preg_match('~^([^/]+//[^/]+)~', $scripturl, $match) == 1)
$_SERVER['REQUEST_URL'] = $match[1] . $_SERVER['REQUEST_URI'];
else
$_SERVER['REQUEST_URL'] = $_SERVER['REQUEST_URI'];
// And make sure HTTP_USER_AGENT is set.
$_SERVER['HTTP_USER_AGENT'] = isset($_SERVER['HTTP_USER_AGENT']) ? htmlspecialchars(stripslashes($_SERVER['HTTP_USER_AGENT']), ENT_QUOTES) : '';
// Some final checking.
if (preg_match('~^((([1]?\d)?\d|2[0-4]\d|25[0-5])\.){3}(([1]?\d)?\d|2[0-4]\d|25[0-5])$~', $_SERVER['REMOTE_ADDR']) === 0)
$_SERVER['REMOTE_ADDR'] = '';
}
// Adds slashes to the array/variable. Uses two underscores to guard against overloading.
function addslashes__recursive($var, $level = 0)
{
if (!is_array($var))
return addslashes($var);
// Reindex the array with slashes.
$new_var = array();
// Add slashes to every element, even the indexes!
foreach ($var as $k => $v)
$new_var[addslashes($k)] = $level > 25 ? null : addslashes__recursive($v, $level + 1);
return $new_var;
}
// Adds html entities to the array/variable. Uses two underscores to guard against overloading.
function htmlspecialchars__recursive($var, $level = 0)
{
global $func;
if (!is_array($var))
return isset($func) ? $func['htmlspecialchars']($var, ENT_QUOTES) : htmlspecialchars($var, ENT_QUOTES);
// Add the htmlspecialchars to every element.
foreach ($var as $k => $v)
$var[$k] = $level > 25 ? null : htmlspecialchars__recursive($v, $level + 1);
return $var;
}
// Removes url stuff from the array/variable. Uses two underscores to guard against overloading.
function urldecode__recursive($var, $level = 0)
{
if (!is_array($var))
return urldecode($var);
// Reindex the array...
$new_var = array();
// Add the htmlspecialchars to every element.
foreach ($var as $k => $v)
$new_var[urldecode($k)] = $level > 25 ? null : urldecode__recursive($v, $level + 1);
return $new_var;
}
// Strips the slashes off any array or variable. Two underscores for the normal reason.
function stripslashes__recursive($var, $level = 0)
{
if (!is_array($var))
return stripslashes($var);
// Reindex the array without slashes, this time.
$new_var = array();
// Strip the slashes from every element.
foreach ($var as $k => $v)
$new_var[stripslashes($k)] = $level > 25 ? null : stripslashes__recursive($v, $level + 1);
return $new_var;
}
// Trim a string including the HTML space, character 160.
function htmltrim__recursive($var, $level = 0)
{
global $func;
// Remove spaces (32), tabs (9), returns (13, 10, and 11), nulls (0), and hard spaces. (160)
if (!is_array($var))
return isset($func) ? $func['htmltrim']($var) : trim($var, " \t\n\r\x0B\0\xA0");
$new_var = array();
// Go through all the elements and remove the whitespace.
foreach ($var as $k => $v)
$new_var[$k] = $level > 25 ? null : htmltrim__recursive($v, $level + 1);
return $new_var;
}
// !!!
function validate_unicode__recursive($var)
{
if (is_array($var))
return array_map('validate_unicode__recursive', $var);
$cleanup = array_merge(range(0, 8), range(11, 12), range(14, 31));
// Assuming unicode for now - won't really hurt if we're wrong.
for ($i = 0; $i < strlen($var); $i++)
{
$c = ord($var{$i});
if (in_array($c, $cleanup))
{
$var = substr($var, 0, $i) . substr($var, $i + 1);
$i--;
continue;
}
if ($c < 192)
continue;
elseif ($c < 224)
$i++;
elseif ($c < 240)
$i += 2;
elseif ($c < 248)
$i += 3;
elseif ($c < 252)
$i += 4;
elseif ($c < 254)
$i += 5;
}
return $var;
}
// Rewrite URLs to include the session ID.
function ob_sessrewrite($buffer)
{
global $scripturl, $modSettings, $user_info, $context;
// If $scripturl is set to nothing, or the SID is not defined (SSI?) just quit.
if ($scripturl == '' || !defined('SID'))
return $buffer;
// Do nothing if the session is cookied, or they are a crawler - guests are caught by redirectexit(). This doesn't work below PHP 4.3.0, because it makes the output buffer bigger.
// !!! smflib
if (empty($_COOKIE) && SID != '' && empty($context['browser']['possibly_robot']) && @version_compare(PHP_VERSION, '4.3.0') != -1)
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '(?!\?' . preg_quote(SID, '/') . ')(\?)?/', '"' . $scripturl . '?' . SID . '&', $buffer);
// Debugging templates, are we?
elseif (isset($_GET['debug']))
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '(\?)?/', '"' . $scripturl . '?debug;', $buffer);
// This should work even in 4.2.x, just not CGI without cgi.fix_pathinfo.
if (!empty($modSettings['queryless_urls']) && (!$context['server']['is_cgi'] || @ini_get('cgi.fix_pathinfo') == 1) && $context['server']['is_apache'])
{
// Let's do something special for session ids!
if (defined('SID') && SID != '')
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '\?(?:' . SID . ';)((?:board|topic)=[^#"]+?)(#[^"]*?)?"/e', "'\"' . \$scripturl . '/' . strtr('\$1', '&;=', '//,') . '.html?' . SID . '\$2\"'", $buffer);
else
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '\?((?:board|topic)=[^#"]+?)(#[^"]*?)?"/e', "'\"' . \$scripturl . '/' . strtr('\$1', '&;=', '//,') . '.html\$2\"'", $buffer);
}
// Return the changed buffer.
return $buffer;
}
?>
