4 files changed, 14 insertions, 0 deletions
diff --git a/execute.php b/execute.php
index 72f7d0b..49e04df 100644
--- a/execute.php
+++ b/execute.php
@@ -19,6 +19,10 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  */
 
+if (!defined('LOOKING_GLASS01')) {
+  exit;
+}
+
 require_once 'config.php';
 require_once 'router.php';
 require_once 'utils.php';
diff --git a/index.php b/index.php
index 895be86..8e43b67 100644
--- a/index.php
+++ b/index.php
@@ -18,6 +18,8 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  */
 
+define('LOOKING_GLASS01', 1);
+
 require_once 'config.php';
 ?>
 <!DOCTYPE html>
diff --git a/router.php b/router.php
index f19e6d0..a9f33be 100644
--- a/router.php
+++ b/router.php
@@ -19,6 +19,10 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  */
 
+if (!defined('LOOKING_GLASS01')) {
+  exit;
+}
+
 require_once 'config.php';
 require_once 'utils.php';
 
diff --git a/utils.php b/utils.php
index 6baafb8..ec3db07 100644
--- a/utils.php
+++ b/utils.php
@@ -19,6 +19,10 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  */
 
+if (!defined('LOOKING_GLASS01')) {
+  exit;
+}
+
 function match_ipv4($ip) {
   return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
 }