Add forward DNS lookup check

main.py

@@ -10,7 +10,7 @@ import sys
 from ipaddress import AddressValueError, IPv4Address, IPv6Address
 
 import cherrypy
-from cherrypy.lib.static import serve_file
+# from cherrypy.lib.static import serve_file
 from jinja2 import Template
 import yaml
 
@@ -59,8 +59,13 @@ class CloudInitApp:
 
         try:
             self.hostinfo = socket.gethostbyaddr(self.remoteip)
+            forward_lookup = socket.gethostbyname(self.hostinfo[0])
+            if forward_lookup != self.remoteip:
+                self.hostinfo = ('localhost', )
         except socket.herror:
             self.hostinfo = ('localhost', )
+        except socket.gaierror:
+            self.hostinfo = (self.remoteip, )
 
     def _redirect_if_needed(self):
         filepath = os.path.join(PATH, "data", self.hostinfo[0],