Android VpnService阻止数据包

Question

编辑： - 我可以使用vpn启动互联网。其他问题是，现在我在 VpnService 的这段代码中接收了我服务中的数据包但是我无法想出阻止特定网站的正确方法。我尝试使用 InnetAddress 来使用名称解析，但是没有给出预期的结果：

   **@Override
    public void run()
    {
        Log.i(TAG, "Started");
        FileChannel vpnInput = new FileInputStream(vpnFileDescriptor).getChannel();
        FileChannel vpnOutput = new FileOutputStream(vpnFileDescriptor).getChannel();
        try
        {
            ByteBuffer bufferToNetwork = null;
            boolean dataSent = true;
            boolean dataReceived;
            while (!Thread.interrupted())
            {
                if (dataSent)
                    bufferToNetwork = ByteBufferPool.acquire();
                int readBytes = vpnInput.read(bufferToNetwork);
                if (readBytes > 0)
                {
                    dataSent = true;
                    bufferToNetwork.flip();
                    Packet packet = new Packet(bufferToNetwork);
                    Log.e("loggg packet",packet.toString());
                    if (packet.isUDP())
                    {
                        deviceToNetworkUDPQueue.offer(packet);
                    }
                    else if (packet.isTCP())
                    {
                        deviceToNetworkTCPQueue.offer(packet);
                    }
                    else
                    {
                        Log.w(TAG, "Unknown packet type");
                        dataSent = false;
                    }
                }
                else
                {
                    dataSent = false;
                }
                ByteBuffer bufferFromNetwork = networkToDeviceQueue.poll();
                if (bufferFromNetwork != null)
                {
                    bufferFromNetwork.flip();
                    vpnOutput.write(bufferFromNetwork);
                    dataReceived = true;
                    ByteBufferPool.release(bufferFromNetwork);
                }
                else
                {
                    dataReceived = false;
                }
                if (!dataSent && !dataReceived)
                    Thread.sleep(10);
            }
        }
        catch (InterruptedException e)
        {
            Log.i(TAG, "Stopping");
        }
        catch (IOException e)
        {
            Log.w(TAG, e.toString(), e);
        }
        finally
        {
            closeResources(vpnInput, vpnOutput);
        }
    }**

我收到这种格式的数据包：

Packet{ip4Header=IP4Header{version=4, totalLength=40, protocol=TCP,     headerChecksum=14192, sourceAddress=10.0.8.1, destinationAddress=216.58.196.100},   tcpHeader=TCPHeader{sourcePort=39217, destinationPort=443,  sequenceNumber=800911985, acknowledgementNumber=823271551, headerLength=20,     window=29596, checksum=32492, flags= ACK}, payloadSize=0}

我使用THIS CODE作为启动器而无法阻止数据包。

greyshirts no root firewall和mobiwool no root firewall等应用程序运行良好，也基于vpn。欢迎提出任何建议。