Add firewall and auth on driver API

dcc/driver/models.py

@@ -1,16 +1,41 @@
 from django.db import models
+from django.core.exceptions import ValidationError
+from ipaddress import IPv4Address, IPv4Network
 from solo.models import SingletonModel
 
 
 class DriverConfiguration(SingletonModel):
     remote_host = models.GenericIPAddressField(
-        protocol="IPv4", default="192.168.4.1"
+        protocol="IPv4",
+        default="192.168.4.1"
     )
     remote_port = models.SmallIntegerField(default=2560)
     timeout = models.SmallIntegerField(default=250)
 
+    network = models.GenericIPAddressField(
+        protocol="IPv4",
+        default="192.168.4.0",
+        blank=True,
+        null=True
+    )
+    subnet_mask = models.GenericIPAddressField(
+        protocol="IPv4",
+        default="255.255.255.0",
+        blank=True,
+        null=True
+    )
+
     def __str__(self):
         return "Configuration"
 
+    def clean(self, *args, **kwargs):
+        if self.network:
+            try:
+                IPv4Network(
+                    "{0}/{1}".format(self.network, self.subnet_mask))
+            except ValueError as e:
+                raise ValidationError(e)
+        super().clean(*args, **kwargs)
+
     class Meta:
         verbose_name = "Configuration"