dns/bind: add checkbox to disable prefetching (#1635)

dns/bind/src/opnsense/mvc/app/controllers/OPNsense/Bind/forms/general.xml

@@ -79,6 +79,13 @@
         <advanced>true</advanced>
         <help>This will hide the local BIND version in DNS queries.</help>
     </field>
+    <field>
+        <id>general.disableprefetch</id>
+        <label>Disable Prefetching</label>
+        <type>checkbox</type>
+        <advanced>true</advanced>
+        <help>This will disable prefetching of domains before they time out.</help>
+    </field>
     <field>
         <id>general.enableratelimiting</id>
         <label>Enable Rate Limiting</label>

dns/bind/src/opnsense/mvc/app/models/OPNsense/Bind/General.xml

@@ -1,7 +1,7 @@
 <model>
     <mount>//OPNsense/bind/general</mount>
     <description>BIND configuration</description>
-    <version>1.0.6</version>
+    <version>1.0.7</version>
     <items>
         <enabled type="BooleanField">
             <default>0</default>
@@ -79,6 +79,10 @@
             <default>0</default>
             <Required>Y</Required>
         </hideversion>
+        <disableprefetch type="BooleanField">
+            <default>0</default>
+            <Required>Y</Required>
+        </disableprefetch>
         <enableratelimiting type="BooleanField">
             <default>0</default>
             <Required>Y</Required>

dns/bind/src/opnsense/service/templates/OPNsense/Bind/named.conf

@@ -50,6 +50,9 @@ options {
 {% if helpers.exists('OPNsense.bind.general.hideversion') and OPNsense.bind.general.hideversion == '1' %}
         version none;
 {% endif %}
+{% if helpers.exists('OPNsense.bind.general.disableprefetch') and OPNsense.bind.general.disableprefetch == '1' %}
+        prefetch 0;
+{% endif %}
 {% if helpers.exists('OPNsense.bind.general.enableratelimiting') and OPNsense.bind.general.enableratelimiting == '1' %}
 {%   if helpers.exists('OPNsense.bind.general.ratelimitcount') and OPNsense.bind.general.ratelimitcount != '' %}
 	rate-limit {