dnsmasq "domain-needed" property

php/savesettings.php

@@ -77,10 +77,20 @@ function validDomain($domain_name)
 					$error .= "Secondary IP (".$secondaryIP.") is invalid!<br>";
 				}
 
+				// Check if domain-needed is requested
+				if(isset($_POST["DNSrequiresFQDN"]))
+				{
+					$extra = "domain-needed";
+				}
+				else
+				{
+					$extra = "domain-not-needed";
+				}
+
 				// If there has been no error we can save the new DNS server IPs
 				if(!strlen($error))
 				{
-					exec("sudo pihole -a setdns ".$primaryIP." ".$secondaryIP);
+					exec("sudo pihole -a setdns ".$primaryIP." ".$secondaryIP." ".$extra);
 					$success .= "The DNS settings have been updated";
 				}
 				else

settings.php

@@ -224,6 +224,19 @@
 	} else {
 		$piHoleDNS2 = "unknown";
 	}
+
+	if(isset($setupVars["DNS_FQDN_REQUIRED"])){
+		if($setupVars["DNS_FQDN_REQUIRED"])
+		{
+			$DNSrequiresFQDN = true;
+		}
+		else
+		{
+			$DNSrequiresFQDN = false;
+		}
+	} else {
+		$DNSrequiresFQDN = true;
+	}
 ?>
 		<div class="box box-warning">
 			<div class="box-header with-border">
@@ -257,6 +270,11 @@
 						</div>
 					</div>
 				</div>
+				<div class="col-lg-12">
+					<div class="form-group">
+						<div class="checkbox"><label><input type="checkbox" name="DNSrequiresFQDN" <?php if($DNSrequiresFQDN){ ?>checked<?php } ?>> never forward non-FQDNs to upstream servers (may prevent accessing local hostnames if the Pi-Hole is not used as DHCP server)</label></div>
+					</div>
+				</div>
 			</div>
 			<div class="box-footer">
 				<input type="hidden" name="field" value="DNS">