inc/functions: merge functions GET and validate_get

And make sure all input from $_GET variables are parsed and validated.

1 files changed, 48 insertions, 10 deletions

diff --git a/inc/functions.inc.php b/inc/functions.inc.php
index f667772..9e56868 100644
--- a/inc/functions.inc.php
+++ b/inc/functions.inc.php
@@ -2,28 +2,66 @@
 
 # global functions
 
-function GET($index) {
-        if (isset($_GET[$index]))
-                return $_GET[$index];
-        return null;
-}
+function GET($index = NULL, $value = NULL) {
+        # parse all values from $_GET when no index is given
+        if ($index === NULL) {
+                $arr = array();
+                foreach($_GET as $i => $v) {
+                        $arr[$i] = GET($i);
+                }
+                return $arr;
+        }
+
+        if (!isset($_GET[$index]))
+                return NULL;
+
+        if ($value === NULL)
+                $value = $_GET[$index];
 
-function validate_get($value, $type) {
-        switch($type) {
+        $desc = array(
+                'h'  => 'host',
+                'p'  => 'plugin',
+                'c'  => 'category',
+                't'  => 'type',
+                'pi' => 'plugin instance',
+                'ti' => 'type instance',
+                's'  => 'seconds',
+                'x'  => 'x-axis',
+                'y'  => 'y-axis',
+        );
+
+        switch($index) {
                 case 'h': # host
-                        if (!preg_match('/^[\w-.]+$/u', $value))
+                        if (!preg_match('/^[\w-.]+$/u', $value)) {
+                                error_log(sprintf('Invalid %s in $_GET["%s"]: "%s"', $desc[$index], $index, $value));
                                 return NULL;
+                        }
                 break;
                 case 'p': # plugin
                 case 'c': # category
                 case 't': # type
-                        if (!preg_match('/^\w+$/u', $value))
+                        if (!preg_match('/^\w+$/u', $value)) {
+                                error_log(sprintf('Invalid %s in $_GET["%s"]: "%s"', $desc[$index], $index, $value));
                                 return NULL;
+                        }
                 break;
                 case 'pi': # plugin instance
                 case 'ti': # type instance
-                        if (!preg_match('/^[\w-]+$/u', $value))
+                        if (!preg_match('/^[\w-]+$/u', $value)) {
+                                error_log(sprintf('Invalid %s in $_GET["%s"]: "%s"', $desc[$index], $index, $value));
+                                return NULL;
+                        }
+                break;
+                case 's': # seconds
+                case 'x': # x-axis
+                case 'y': # y-axis
+                        if (!is_numeric($value)) {
+                                error_log(sprintf('Invalid %s in $_GET["%s"]: "%s"', $desc[$index], $index, $value));
                                 return NULL;
+                        }
+                break;
+                default:
+                        return NULL;
                 break;
         }