Feature/search domain for android (#1256)

Support search domain on Android

- pass list of search domains to Android SDK
- throw notification in case of search domain changes

iface/tun.go

@@ -1,8 +1,9 @@
 package iface
 
 type MobileIFaceArguments struct {
-	Routes []string
-	Dns    string
+	Routes        []string
+	Dns           string
+	SearchDomains []string
 }
 
 // NetInterface represents a generic network tunnel interface

iface/tun_adapter.go

@@ -2,6 +2,6 @@ package iface
 
 // TunAdapter is an interface for create tun device from externel service
 type TunAdapter interface {
-	ConfigureInterface(address string, mtu int, dns string, routes string) (int, error)
+	ConfigureInterface(address string, mtu int, dns string, searchDomains string, routes string) (int, error)
 	UpdateAddr(address string) error
 }

iface/tun_android.go

@@ -37,7 +37,8 @@ func (t *tunDevice) Create(mIFaceArgs MobileIFaceArguments) error {
 	log.Info("create tun interface")
 	var err error
 	routesString := t.routesToString(mIFaceArgs.Routes)
-	t.fd, err = t.tunAdapter.ConfigureInterface(t.address.String(), t.mtu, mIFaceArgs.Dns, routesString)
+	searchDomainsToString := t.searchDomainsToString(mIFaceArgs.SearchDomains)
+	t.fd, err = t.tunAdapter.ConfigureInterface(t.address.String(), t.mtu, mIFaceArgs.Dns, searchDomainsToString, routesString)
 	if err != nil {
 		log.Errorf("failed to create Android interface: %s", err)
 		return err
@@ -94,3 +95,7 @@ func (t *tunDevice) Close() (err error) {
 func (t *tunDevice) routesToString(routes []string) string {
 	return strings.Join(routes, ";")
 }
+
+func (t *tunDevice) searchDomainsToString(searchDomains []string) string {
+	return strings.Join(searchDomains, ";")
+}