/*
 * Copyright (C) 2010-2101 Alibaba Group Holding Limited.
 *
 * 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.alibaba.otter.shared.common.utils;

import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.util.Enumeration;
import java.util.regex.Pattern;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AddressUtils {

    private static final Logger  logger       = LoggerFactory.getLogger(AddressUtils.class);
    private static final String  LOCALHOST_IP = "127.0.0.1";
    private static final String  EMPTY_IP     = "0.0.0.0";
    private static final Pattern IP_PATTERN   = Pattern.compile("[0-9]{1,3}(\\.[0-9]{1,3}){3,}");

    public static boolean isAvailablePort(int port) {
        ServerSocket ss = null;
        try {
            ss = new ServerSocket(port);
            ss.bind(null);
            return true;
        } catch (IOException e) {
            return false;
        } finally {
            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                }
            }
        }
    }

    private static boolean isValidHostAddress(InetAddress address) {
        if (address == null || address.isLoopbackAddress()) {
            return false;
        }

        String name = address.getHostAddress();
        return (name != null && !EMPTY_IP.equals(name) && !LOCALHOST_IP.equals(name) && IP_PATTERN.matcher(name)
            .matches());
    }

    public static String getHostIp() {
        InetAddress address = getHostAddress();
        return address == null ? null : address.getHostAddress();
    }

    public static String getHostName() {
        InetAddress address = getHostAddress();
        return address == null ? null : address.getHostName();
    }

    /**
     * 判断该ip是否为本机ip，一台机器可能同时有多个IP
     * 
     * @param ip
     * @return
     */
    public static boolean isHostIp(String ip) {
        InetAddress localAddress = null;
        try {
            localAddress = InetAddress.getLocalHost();
            if (isValidHostAddress(localAddress)
                && (localAddress.getHostAddress().equals(ip) || localAddress.getHostName().equals(ip))) {
                return true;
            }
        } catch (Throwable e) {
            logger.warn("Failed to retriving local host ip address, try scan network card ip address. cause: "
                        + e.getMessage());
        }

        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            if (interfaces != null) {
                while (interfaces.hasMoreElements()) {
                    try {
                        NetworkInterface network = interfaces.nextElement();
                        Enumeration<InetAddress> addresses = network.getInetAddresses();
                        if (addresses != null) {
                            while (addresses.hasMoreElements()) {
                                try {
                                    InetAddress address = addresses.nextElement();
                                    if (isValidHostAddress(address) && address.getHostAddress().equals(ip)) {
                                        return true;
                                    }
                                } catch (Throwable e) {
                                    logger.warn("Failed to retriving network card ip address. cause:" + e.getMessage());
                                }
                            }
                        }
                    } catch (Throwable e) {
                        logger.warn("Failed to retriving network card ip address. cause:" + e.getMessage());
                    }
                }
            }
        } catch (Throwable e) {
            logger.warn("Failed to retriving network card ip address. cause:" + e.getMessage());
        }

        return false;
    }

    public static InetAddress getHostAddress() {
        InetAddress localAddress = null;
        try {
            localAddress = InetAddress.getLocalHost();
            if (isValidHostAddress(localAddress)) {
                return localAddress;
            }
        } catch (Throwable e) {
            logger.warn("Failed to retriving local host ip address, try scan network card ip address. cause: "
                        + e.getMessage());
        }
        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            if (interfaces != null) {
                while (interfaces.hasMoreElements()) {
                    try {
                        NetworkInterface network = interfaces.nextElement();
                        Enumeration<InetAddress> addresses = network.getInetAddresses();
                        if (addresses != null) {
                            while (addresses.hasMoreElements()) {
                                try {
                                    InetAddress address = addresses.nextElement();
                                    if (isValidHostAddress(address)) {
                                        return address;
                                    }
                                } catch (Throwable e) {
                                    logger.warn("Failed to retriving network card ip address. cause:" + e.getMessage());
                                }
                            }
                        }
                    } catch (Throwable e) {
                        logger.warn("Failed to retriving network card ip address. cause:" + e.getMessage());
                    }
                }
            }
        } catch (Throwable e) {
            logger.warn("Failed to retriving network card ip address. cause:" + e.getMessage());
        }
        logger.error("Could not get local host ip address, will use 127.0.0.1 instead.");
        return localAddress;
    }
}

@@ -2632,32 +2632,68 @@
             if (
+localAddress.isLoopbackAddress() %7C%7C 
 isValidHostAddre
@@ -3718,32 +3718,63 @@
             if (
+address.isLoopbackAddress() %7C%7C 
 isValidHostAddre

修改：在某些网络环境下，通过SSH或其它工具转发端口到本地，实际使用 127.0.0.1 回环地址的情况需要得到支持。因 isValidHostAddress()方法引用较多，所以没有直接修改此方法。