/*
* Copyright 2013 the original author or authors.
*
* 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 org.springframework.yarn.support;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
/**
* Various network utilities.
*
* @author Janne Valkealahti
*
*/
public class NetworkUtils {
/**
* Gets the main network address.
*
* @return network address, null if not found
*/
public static String getDefaultAddress() {
Enumeration<NetworkInterface> nets;
try {
nets = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
return null;
}
NetworkInterface netinf;
while (nets.hasMoreElements()) {
netinf = nets.nextElement();
Enumeration<InetAddress> addresses = netinf.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = addresses.nextElement();
if (!address.isAnyLocalAddress() && !address.isMulticastAddress() && !(address instanceof Inet6Address)) {
return address.getHostAddress();
}
}
}
return null;
}
}