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- <?php
- /**
- * This file does a lot of important stuff. Mainly, this means it handles
- the query string, request variables, and session management.
- *
- * Simple Machines Forum (SMF)
- *
- * @package SMF
- * @author Simple Machines http://www.simplemachines.org
- * @copyright 2011 Simple Machines
- * @license http://www.simplemachines.org/about/smf/license.php BSD
- *
- * @version 2.0
- */
- if (!defined('SMF'))
- die('Hacking attempt...');
- /**
- * Clean the request variables - add html entities to GET and slashes if magic_quotes_gpc is Off.
- *
- * What it does:
- * - 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.
- */
- function cleanRequest()
- {
- global $board, $topic, $boardurl, $scripturl, $modSettings, $smcFunc;
- // Makes it easier to refer to things this way.
- $scripturl = $boardurl . '/index.php';
- // What function to use to reverse magic quotes - if sybase is on we assume that the database sensibly has the right unescape function!
- $removeMagicQuoteFunction = @ini_get('magic_quotes_sybase') || strtolower(@ini_get('magic_quotes_sybase')) == 'on' ? 'unescapestring__recursive' : 'stripslashes__recursive';
- // Save some memory.. (since we don't use these anyway.)
- unset($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('Numeric request keys are invalid.');
- // 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']))
- $_SERVER['QUERY_STRING'] = getenv('QUERY_STRING');
- // It seems that sticking a URL after the query string is mighty common, well, it's evil - don't.
- if (strpos($_SERVER['QUERY_STRING'], 'http') === 0)
- {
- header('HTTP/1.1 400 Bad Request');
- die;
- }
- // 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.
- // Do not urldecode() the querystring, unless you so much wish to break OpenID implementation. :)
- $_SERVER['QUERY_STRING'] = substr($_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" => ''))), $_GET);
- // Magic quotes still applies with parse_str - so clean it up.
- if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
- $_GET = $removeMagicQuoteFunction($_GET);
- }
- elseif (strpos(@ini_get('arg_separator.input'), ';') !== false)
- {
- if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
- $_GET = $removeMagicQuoteFunction($_GET);
- // Search engines will send action=profile%3Bu=1, which confuses PHP.
- 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'];
- // !!! smflib.
- // Replace 'index.php/a,b,c/d/e,f' with 'a=b,c&d=&e=f' and parse it into $_GET.
- if (strpos($request, basename($scripturl) . '/') !== false)
- {
- parse_str(substr(preg_replace('/&(\w+)(?=&|$)/', '&$1=', strtr(preg_replace('~/([^,/]+),~', '/$1=', substr($request, strpos($request, basename($scripturl)) + strlen(basename($scripturl)))), '/', '&')), 1), $temp);
- if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
- $temp = $removeMagicQuoteFunction($temp);
- $_GET += $temp;
- }
- }
- // If magic quotes is on we have some work...
- if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0)
- {
- $_ENV = $removeMagicQuoteFunction($_ENV);
- $_POST = $removeMagicQuoteFunction($_POST);
- $_COOKIE = $removeMagicQuoteFunction($_COOKIE);
- foreach ($_FILES as $k => $dummy)
- if (isset($_FILES[$k]['name']))
- $_FILES[$k]['name'] = $removeMagicQuoteFunction($_FILES[$k]['name']);
- }
- // Add entities to GET. This is kinda like the slashes on everything else.
- $_GET = htmlspecialchars__recursive($_GET);
- // 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 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 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) $_GET['action'];
- // Make sure we have a valid REMOTE_ADDR.
- if (!isset($_SERVER['REMOTE_ADDR']))
- {
- $_SERVER['REMOTE_ADDR'] = '';
- // A new magic variable to indicate we think this is command line.
- $_SERVER['is_cli'] = true;
- }
- elseif (preg_match('~^((([1]?\d)?\d|2[0-4]\d|25[0-5])\.){3}(([1]?\d)?\d|2[0-4]\d|25[0-5])$~', $_SERVER['REMOTE_ADDR']) === 0)
- $_SERVER['REMOTE_ADDR'] = 'unknown';
- // Try to calculate their most likely IP for those people behind proxies (And the like).
- $_SERVER['BAN_CHECK_IP'] = $_SERVER['REMOTE_ADDR'];
- // Find the user's IP address. (but don't let it give you 'unknown'!)
- if (!empty($_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['BAN_CHECK_IP'] = implode('.', array_reverse(explode('.', $_SERVER['HTTP_CLIENT_IP'])));
- else
- $_SERVER['BAN_CHECK_IP'] = $_SERVER['HTTP_CLIENT_IP'];
- }
- if (!empty($_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['BAN_CHECK_IP'] = implode('.', array_reverse(explode('.', $_SERVER['HTTP_CLIENT_IP'])));
- else
- $_SERVER['BAN_CHECK_IP'] = $_SERVER['HTTP_CLIENT_IP'];
- }
- elseif (!empty($_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!
- $_SERVER['BAN_CHECK_IP'] = trim($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['BAN_CHECK_IP'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
- }
- // Make sure we know the URL of the current request.
- if (empty($_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($smcFunc['db_unescape_string']($_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['BAN_CHECK_IP']) === 0)
- $_SERVER['BAN_CHECK_IP'] = '';
- if ($_SERVER['REMOTE_ADDR'] == 'unknown')
- $_SERVER['REMOTE_ADDR'] = '';
- }
- /**
- * Adds slashes to the array/variable.
- * What it does:
- * - returns the var, as an array or string, with escapes as required.
- - importantly escapes all keys and values!
- - calls itself recursively if necessary.
- *
- * @param array|string $var
- * @return array|string
- */
- function escapestring__recursive($var)
- {
- global $smcFunc;
- if (!is_array($var))
- return $smcFunc['db_escape_string']($var);
- // Reindex the array with slashes.
- $new_var = array();
- // Add slashes to every element, even the indexes!
- foreach ($var as $k => $v)
- $new_var[$smcFunc['db_escape_string']($k)] = escapestring__recursive($v);
- return $new_var;
- }
- /**
- * Adds html entities to the array/variable. Uses two underscores to guard against overloading.
- * What it does:
- * - adds entities (", <, >) to the array or string var.
- - importantly, does not effect keys, only values.
- - calls itself recursively if necessary.
- * @param array|string $var
- * @param int $level = 0
- * @return array|string
- */
- function htmlspecialchars__recursive($var, $level = 0)
- {
- global $smcFunc;
- if (!is_array($var))
- return isset($smcFunc['htmlspecialchars']) ? $smcFunc['htmlspecialchars']($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.
- * What it does:
- * - 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.
- *
- * @param array|string $var
- * @param int $level = 0
- * @return array|string
- */
- function urldecode__recursive($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;
- }
- /**
- * Unescapes any array or variable. Uses two underscores to guard against overloading.
- * What it does:
- * - unescapes, recursively, from the array or string var.
- - effects both keys and values of arrays.
- - calls itself recursively to handle arrays of arrays.
- *
- * @param array|string $var
- * @return array|string
- */
- function unescapestring__recursive($var)
- {
- global $smcFunc;
- if (!is_array($var))
- return $smcFunc['db_unescape_string']($var);
- // Reindex the array without slashes, this time.
- $new_var = array();
- // Strip the slashes from every element.
- foreach ($var as $k => $v)
- $new_var[$smcFunc['db_unescape_string']($k)] = unescapestring__recursive($v);
- return $new_var;
- }
- /**
- * Remove slashes recursively. Uses two underscores to guard against overloading.
- * What it does:
- * - removes slashes, recursively, from the array or string var.
- - effects both keys and values of arrays.
- - calls itself recursively to handle arrays of arrays.
- *
- * @param array|string $var
- * @param int $level = 0
- * @return array|string
- */
- function stripslashes__recursive($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. Uses two underscores to guard against overloading.
- * What it does:
- * - 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.
- *
- * @param array|string $var
- * @param int $level = 0
- * @return array|string
- */
- function htmltrim__recursive($var, $level = 0)
- {
- global $smcFunc;
- // Remove spaces (32), tabs (9), returns (13, 10, and 11), nulls (0), and hard spaces. (160)
- if (!is_array($var))
- return isset($smcFunc) ? $smcFunc['htmltrim']($var) : trim($var, ' ' . "\t\n\r\x0B" . '\0' . "\xA0");
- // Go through all the elements and remove the whitespace.
- foreach ($var as $k => $v)
- $var[$k] = $level > 25 ? null : htmltrim__recursive($v, $level + 1);
- return $var;
- }
- /**
- * Clean up the XML to make sure it doesn't contain invalid characters.
- * What it does:
- * - removes invalid XML characters to assure the input string being
- parsed properly.
- *
- * @param string $string
- * @return string
- */
- function cleanXml($string)
- {
- global $context;
- // http://www.w3.org/TR/2000/REC-xml-20001006#NT-Char
- return preg_replace('~[\x00-\x08\x0B\x0C\x0E-\x19' . ($context['utf8'] ? (@version_compare(PHP_VERSION, '4.3.3') != -1 ? '\x{D800}-\x{DFFF}\x{FFFE}\x{FFFF}' : "\xED\xA0\x80-\xED\xBF\xBF\xEF\xBF\xBE\xEF\xBF\xBF") : '') . ']~' . ($context['utf8'] ? 'u' : ''), '', $string);
- }
- /**
- * @todo needs a description
- *
- * @param string $string
- * @return string
- */
- function JavaScriptEscape($string)
- {
- global $scripturl;
- return '\'' . strtr($string, array(
- "\r" => '',
- "\n" => '\\n',
- "\t" => '\\t',
- '\\' => '\\\\',
- '\'' => '\\\'',
- '</' => '<\' + \'/',
- 'script' => 'scri\'+\'pt',
- '<a href' => '<a hr\'+\'ef',
- $scripturl => $scripturl . '\'+\'',
- )) . '\'';
- }
- /**
- * Rewrite URLs to include the session ID.
- * What it does:
- * - 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.
- *
- * @param string $buffer
- * @return string
- */
- function ob_sessrewrite($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']))
- $buffer = preg_replace('/(?<!<link rel="canonical" href=)"' . preg_quote($scripturl, '/') . '\\??/', '"' . $scripturl . '?debug;', $buffer);
- // This should work even in 4.2.x, just not CGI without cgi.fix_pathinfo.
- if (!empty($modSettings['queryless_urls']) && (!$context['server']['is_cgi'] || @ini_get('cgi.fix_pathinfo') == 1 || @get_cfg_var('cgi.fix_pathinfo') == 1) && ($context['server']['is_apache'] || $context['server']['is_lighttpd']))
- {
- // 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;
- }
- ?>
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