1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.util;
18
19 import java.net.InetAddress;
20 import java.net.NetworkInterface;
21 import java.net.SocketException;
22 import java.net.UnknownHostException;
23 import java.util.Enumeration;
24
25 import org.apache.logging.log4j.Logger;
26 import org.apache.logging.log4j.status.StatusLogger;
27
28 /**
29 *
30 */
31 public final class NetUtils {
32
33 private static final Logger LOGGER = StatusLogger.getLogger();
34
35 private NetUtils() {
36 }
37
38 /**
39 * This method gets the network name of the machine we are running on.
40 * Returns "UNKNOWN_LOCALHOST" in the unlikely case where the host name
41 * cannot be found.
42 *
43 * @return String the name of the local host
44 */
45 public static String getLocalHostname() {
46 try {
47 final InetAddress addr = InetAddress.getLocalHost();
48 return addr.getHostName();
49 } catch (final UnknownHostException uhe) {
50 try {
51 final Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
52 while (interfaces.hasMoreElements()) {
53 final NetworkInterface nic = interfaces.nextElement();
54 final Enumeration<InetAddress> addresses = nic.getInetAddresses();
55 while (addresses.hasMoreElements()) {
56 final InetAddress address = addresses.nextElement();
57 if (!address.isLoopbackAddress()) {
58 final String hostname = address.getHostName();
59 if (hostname != null) {
60 return hostname;
61 }
62 }
63 }
64 }
65 } catch (final SocketException se) {
66 LOGGER.error("Could not determine local host name", uhe);
67 return "UNKNOWN_LOCALHOST";
68 }
69 LOGGER.error("Could not determine local host name", uhe);
70 return "UNKNOWN_LOCALHOST";
71 }
72 }
73
74 }