HostAddressFinder.java

/*
 * Copyright (c) 2012, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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 org.wso2.carbon.identity.thrift.authentication.internal.util;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class HostAddressFinder {

    private HostAddressFinder(){

    }
    public static String findAddress(String hostname) throws SocketException {
           if("localhost".equals(hostname.trim())||ThriftAuthenticationConstants.IP_ADDRESS.equals(hostname.trim())||"::1".equals(hostname.trim())){
            Enumeration<NetworkInterface> ifaces =
                    NetworkInterface.getNetworkInterfaces();
            while (ifaces.hasMoreElements()) {
                NetworkInterface iface = ifaces.nextElement();
                Enumeration<InetAddress> addresses = iface.getInetAddresses();

                while (addresses.hasMoreElements()) {
                    InetAddress addr = addresses.nextElement();
                    if (addr instanceof Inet4Address && !addr.isLoopbackAddress()) {
                        return addr.getHostAddress();
                    }
                }
            }
            return ThriftAuthenticationConstants.IP_ADDRESS;
        } else {
            return hostname;
        }
    }
}