| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.logging.log4j.core.util; |
| |
| import java.io.File; |
| import java.net.InetAddress; |
| import java.net.MalformedURLException; |
| import java.net.NetworkInterface; |
| import java.net.SocketException; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.net.URL; |
| import java.net.UnknownHostException; |
| import java.util.Arrays; |
| import java.util.Enumeration; |
| |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.status.StatusLogger; |
| |
| /** |
| * Networking-related convenience methods. |
| */ |
| public final class NetUtils { |
| |
| private static final Logger LOGGER = StatusLogger.getLogger(); |
| private static final String UNKNOWN_LOCALHOST = "UNKNOWN_LOCALHOST"; |
| |
| private NetUtils() { |
| // empty |
| } |
| |
| /** |
| * This method gets the network name of the machine we are running on. Returns "UNKNOWN_LOCALHOST" in the unlikely |
| * case where the host name cannot be found. |
| * |
| * @return String the name of the local host |
| */ |
| public static String getLocalHostname() { |
| try { |
| final InetAddress addr = InetAddress.getLocalHost(); |
| return addr == null ? UNKNOWN_LOCALHOST : addr.getHostName(); |
| } catch (final UnknownHostException uhe) { |
| try { |
| final Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces(); |
| if (interfaces != null) { |
| while (interfaces.hasMoreElements()) { |
| final NetworkInterface nic = interfaces.nextElement(); |
| final Enumeration<InetAddress> addresses = nic.getInetAddresses(); |
| while (addresses.hasMoreElements()) { |
| final InetAddress address = addresses.nextElement(); |
| if (!address.isLoopbackAddress()) { |
| final String hostname = address.getHostName(); |
| if (hostname != null) { |
| return hostname; |
| } |
| } |
| } |
| } |
| } |
| } catch (final SocketException se) { |
| LOGGER.error("Could not determine local host name", uhe); |
| return UNKNOWN_LOCALHOST; |
| } |
| LOGGER.error("Could not determine local host name", uhe); |
| return UNKNOWN_LOCALHOST; |
| } |
| } |
| |
| /** |
| * Returns the local network interface's MAC address if possible. The local network interface is defined here as |
| * the {@link java.net.NetworkInterface} that is both up and not a loopback interface. |
| * |
| * @return the MAC address of the local network interface or {@code null} if no MAC address could be determined. |
| */ |
| public static byte[] getMacAddress() { |
| byte[] mac = null; |
| try { |
| final InetAddress localHost = InetAddress.getLocalHost(); |
| try { |
| final NetworkInterface localInterface = NetworkInterface.getByInetAddress(localHost); |
| if (isUpAndNotLoopback(localInterface)) { |
| mac = localInterface.getHardwareAddress(); |
| } |
| if (mac == null) { |
| final Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces(); |
| if (networkInterfaces != null) { |
| while (networkInterfaces.hasMoreElements() && mac == null) { |
| final NetworkInterface nic = networkInterfaces.nextElement(); |
| if (isUpAndNotLoopback(nic)) { |
| mac = nic.getHardwareAddress(); |
| } |
| } |
| } |
| } |
| } catch (final SocketException e) { |
| LOGGER.catching(e); |
| } |
| if (ArrayUtils.isEmpty(mac) && localHost != null) { |
| // Emulate a MAC address with an IP v4 or v6 |
| final byte[] address = localHost.getAddress(); |
| // Take only 6 bytes if the address is an IPv6 otherwise will pad with two zero bytes |
| mac = Arrays.copyOf(address, 6); |
| } |
| } catch (final UnknownHostException ignored) { |
| // ignored |
| } |
| return mac; |
| } |
| |
| /** |
| * Returns the mac address, if it is available, as a string with each byte separated by a ":" character. |
| * @return the mac address String or null. |
| */ |
| public static String getMacAddressString() { |
| final byte[] macAddr = getMacAddress(); |
| if (!ArrayUtils.isEmpty(macAddr)) { |
| StringBuilder sb = new StringBuilder(String.format("%02x", macAddr[0])); |
| for (int i = 1; i < macAddr.length; ++i) { |
| sb.append(":").append(String.format("%02x", macAddr[i])); |
| } |
| return sb.toString(); |
| |
| } |
| return null; |
| } |
| |
| private static boolean isUpAndNotLoopback(final NetworkInterface ni) throws SocketException { |
| return ni != null && !ni.isLoopback() && ni.isUp(); |
| } |
| |
| /** |
| * Converts a URI string or file path to a URI object. |
| * |
| * @param path the URI string or path |
| * @return the URI object |
| */ |
| public static URI toURI(final String path) { |
| try { |
| // Resolves absolute URI |
| return new URI(path); |
| } catch (final URISyntaxException e) { |
| // A file path or a Apache Commons VFS URL might contain blanks. |
| // A file path may start with a driver letter |
| try { |
| final URL url = new URL(path); |
| return new URI(url.getProtocol(), url.getHost(), url.getPath(), null); |
| } catch (MalformedURLException | URISyntaxException nestedEx) { |
| return new File(path).toURI(); |
| } |
| } |
| } |
| |
| } |