Resolve DNS name into IP address - Android Network

Android examples for Network:IP Address

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Description

Resolve DNS name into IP address

Demo Code

/*/*  w  w w .j  av a  2  s .c  o  m*/
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import android.util.Log;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class Main {
    private static final String ADB_OK = "OKAY";
    private static final int ADB_PORT = 5037;
    private static final String ADB_HOST = "127.0.0.1";
    private static final int ADB_RESPONSE_SIZE = 4;
    private static final String LOGTAG = "AdbUtils";

    /**
     *
     * Resolve DNS name into IP address
     *
     * @param host DNS name
     * @return IP address in integer format
     * @throws IOException
     */
    public static int resolve(String host) throws IOException {
        Socket localSocket = new Socket(ADB_HOST, ADB_PORT);
        DataInputStream dis = new DataInputStream(
                localSocket.getInputStream());
        OutputStream os = localSocket.getOutputStream();
        int count_read = 0;

        if (localSocket == null || dis == null || os == null)
            return -1;
        String cmd = "dns:" + host;

        if (!sendAdbCmd(dis, os, cmd))
            return -1;

        count_read = dis.readInt();
        localSocket.close();
        return count_read;
    }

    /**
     *
     * Send an ADB command using existing socket connection
     *
     * the streams provided must be from a socket connected to adbd already
     *
     * @param is input stream of the socket connection
     * @param os output stream of the socket
     * @param cmd the adb command to send
     * @return if adb gave a success response
     * @throws IOException
     */
    public static boolean sendAdbCmd(InputStream is, OutputStream os,
            String cmd) throws IOException {
        byte[] buf = new byte[ADB_RESPONSE_SIZE];

        cmd = String.format("%04X", cmd.length()) + cmd;
        os.write(cmd.getBytes());
        int read = is.read(buf);
        if (read != ADB_RESPONSE_SIZE || !ADB_OK.equals(new String(buf))) {
            Log.w(LOGTAG, "adb cmd faild.");
            return false;
        }
        return true;
    }
}

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