diff options
Diffstat (limited to 'system/core/Common.php')
| -rw-r--r-- | system/core/Common.php | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/system/core/Common.php b/system/core/Common.php index 3b7ea6ad4..aea5f1808 100644 --- a/system/core/Common.php +++ b/system/core/Common.php @@ -651,5 +651,52 @@ if ( ! function_exists('_stringify_attributes')) } } +// ------------------------------------------------------------------------ + +if ( ! function_exists('function_usable')) +{ + /** + * Function usable + * + * Executes a function_exists() check, and if the Suhosin PHP + * extension is loaded - checks whether the function that is + * checked might be disabled in there as well. + * + * This is useful as function_exists() will return FALSE for + * functions disabled via the *disable_functions* php.ini + * setting, but not for *suhosin.executor.func.blacklist* and + * *suhosin.executor.disable_eval*. These settings will just + * terminate script execution if a disabled function is executed. + * + * @link http://www.hardened-php.net/suhosin/ + * @param string $function_name Function to check for + * @return bool TRUE if the function exists and is safe to call, + * FALSE otherwise. + */ + function function_usable($function_name) + { + static $_suhosin_func_blacklist; + + if (function_exists($function_name)) + { + if ( ! isset($_suhosin_func_blacklist)) + { + $_suhosin_func_blacklist = extension_loaded('suhosin') + ? array() + : explode(',', trim(@ini_get('suhosin.executor.func.blacklist'))); + + if ( ! in_array('eval', $_suhosin_func_blacklist, TRUE) && @ini_get('suhosin.executor.disable_eval')) + { + $_suhosin_func_blacklist[] = 'eval'; + } + } + + return in_array($function_name, $_suhosin_func_blacklist, TRUE); + } + + return FALSE; + } +} + /* End of file Common.php */ /* Location: ./system/core/Common.php */
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