diff --git a/src/main.py b/src/main.py
index 78ff53e..27b82c5 100644
--- a/src/main.py
+++ b/src/main.py
@@ -8,6 +8,7 @@ import logging
 import random
 import ipaddress
 import threading
+import re
 from http.server import ThreadingHTTPServer, BaseHTTPRequestHandler
 
 log = logging.getLogger(__name__)
@@ -139,6 +140,7 @@ class Updater:
             }, f, indent=2)
 
     def run(self):
+        interval = self.config.get("interval", 600)
         while True:
             try:
                 self.detect_updates()
@@ -146,12 +148,16 @@ class Updater:
                 self.write_state()
             except Exception as e:
                 log.exception(e)
-            time.sleep(10*60)
+            time.sleep(interval)
 
 
 class Handler(BaseHTTPRequestHandler):
     def do_GET(self):
         assert isinstance(self.server, WebServer)
+        if not re.fullmatch(r"/[a-zA-Z0-9._-]*", self.path):
+            self.send_response(404)
+            self.end_headers()
+            self.wfile.write(bytes("File not found", 'utf-8'))
         if self.path == '/':
             path = self.server.args.web + '/index.html'
         elif self.path == '/state':