app/java/src/DNSProxyRunner.java


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package org.pihole.dnsproxy;

import android.net.VpnService;

import android.os.ParcelFileDescriptor;

import android.util.Log;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import java.net.InetSocketAddress;
import java.net.SocketAddress;

import java.nio.channels.DatagramChannel;

public class DNSProxyRunner implements Runnable {

    public interface OnEstablishListener {
        void onEstablish(ParcelFileDescriptor networkInterface);
    }
    private OnEstablishListener onEstablishListener;

    private DNSProxyService service;

    DNSProxyRunner(DNSProxyService service) {
        this.service = service;
    }

    @Override
    public void run() {
        try {
            VpnService.Builder builder = this.service.newBuilder()
                .setSession("Pihole DNS Proxy")
                .addAddress("10.111.222.1", 24)
                .addDnsServer(DNSProxyService.PIHOLE_ADDRESS)
                .setBlocking(true);

            this.onEstablishListener.onEstablish(builder.establish());
        } catch (Exception exception) {
            Log.e(DNSProxyService.LOG_TAG, "Failed to establish VPN connection", exception);
        }
    }

    public void setOnEstablishListener(OnEstablishListener listener) {
        this.onEstablishListener = listener;
    }
}