Use new DNS mode

Author: nekohasekai

app/src/main/java/io/nekohasekai/sfa/bg/VPNService.kt

@@ -7,6 +7,7 @@ import android.net.VpnService
 import android.os.Build
 import android.os.IBinder
 import android.util.Log
+import io.nekohasekai.libbox.Libbox
 import io.nekohasekai.libbox.Notification
 import io.nekohasekai.libbox.TunOptions
 import io.nekohasekai.sfa.database.Settings
@@ -83,7 +84,12 @@ class VPNService :
         }
 
         if (options.autoRoute) {
-            builder.addDnsServer(options.dnsServerAddress.value)
+            if (options.dnsMode.value != Libbox.DNSModeDisabled) {
+                val dnsServerAddress = options.dnsServerAddress
+                while (dnsServerAddress.hasNext()) {
+                    builder.addDnsServer(dnsServerAddress.next())
+                }
+            }
 
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                 val inet4RouteAddress = options.inet4RouteAddress