2 * Copyright (c) 2010-2020 Contributors to the openHAB project
4 * See the NOTICE file(s) distributed with this work for additional
7 * This program and the accompanying materials are made available under the
8 * terms of the Eclipse Public License 2.0 which is available at
9 * http://www.eclipse.org/legal/epl-2.0
11 * SPDX-License-Identifier: EPL-2.0
13 package org.openhab.binding.lgwebos.internal;
15 import java.io.IOException;
16 import java.net.DatagramPacket;
17 import java.net.DatagramSocket;
18 import java.net.InetAddress;
19 import java.net.InterfaceAddress;
20 import java.net.NetworkInterface;
21 import java.util.Enumeration;
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
25 import org.eclipse.jdt.annotation.NonNullByDefault;
26 import org.eclipse.jdt.annotation.Nullable;
27 import org.openhab.core.io.net.exec.ExecUtil;
28 import org.slf4j.Logger;
29 import org.slf4j.LoggerFactory;
32 * Class with utility functions to support Wake On Lan (WOL)
34 * @author Arjan Mels - Initial contribution
35 * @author Sebastian Prehn - Modification to getMACAddress
39 public class WakeOnLanUtility {
41 private static final Logger LOGGER = LoggerFactory.getLogger(WakeOnLanUtility.class);
42 private static final Pattern MAC_REGEX = Pattern.compile("(([0-9a-fA-F]{2}[:-]){5}[0-9a-fA-F]{2})");
43 private static final int CMD_TIMEOUT_MS = 1000;
45 private static final String COMMAND;
47 String os = System.getProperty("os.name").toLowerCase();
48 LOGGER.debug("os: {}", os);
49 if ((os.indexOf("win") >= 0)) {
50 COMMAND = "arp -a %s";
51 } else if ((os.indexOf("mac") >= 0)) {
54 if (checkIfLinuxCommandExists("arp")) {
56 } else if (checkIfLinuxCommandExists("arping")) { // typically OH provided docker image
57 COMMAND = "arping -r -c 1 -C 1 %s";
65 * Get MAC address for host
67 * @param hostName Host Name (or IP address) of host to retrieve MAC address for
70 public static @Nullable String getMACAddress(String hostName) {
71 if (COMMAND.isEmpty()) {
72 LOGGER.debug("MAC address detection not possible. No command to identify MAC found.");
76 String cmd = String.format(COMMAND, hostName);
77 String response = ExecUtil.executeCommandLineAndWaitResponse(cmd, CMD_TIMEOUT_MS);
78 Matcher matcher = MAC_REGEX.matcher(response);
79 String macAddress = null;
81 while (matcher.find()) {
82 String group = matcher.group();
84 if (group.length() == 17) {
90 if (macAddress != null) {
91 LOGGER.debug("MAC address of host {} is {}", hostName, macAddress);
93 LOGGER.debug("Problem executing command {} to retrieve MAC address for {}: {}", cmd, hostName, response);
99 * Send single WOL (Wake On Lan) package on all interfaces
101 * @macAddress MAC address to send WOL package to
103 public static void sendWOLPacket(String macAddress) {
104 byte[] bytes = getWOLPackage(macAddress);
107 Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
108 while (interfaces.hasMoreElements()) {
109 NetworkInterface networkInterface = interfaces.nextElement();
110 if (networkInterface.isLoopback()) {
111 continue; // Do not want to use the loopback interface.
113 for (InterfaceAddress interfaceAddress : networkInterface.getInterfaceAddresses()) {
114 InetAddress broadcast = interfaceAddress.getBroadcast();
115 if (broadcast == null) {
119 DatagramPacket packet = new DatagramPacket(bytes, bytes.length, broadcast, 9);
120 try (DatagramSocket socket = new DatagramSocket()) {
122 LOGGER.trace("Sent WOL packet to {} {}", broadcast, macAddress);
123 } catch (IOException e) {
124 LOGGER.warn("Problem sending WOL packet to {} {}", broadcast, macAddress);
129 } catch (IOException e) {
130 LOGGER.warn("Problem with interface while sending WOL packet to {}", macAddress);
135 * Create WOL UDP package: 6 bytes 0xff and then 16 times the 6 byte mac address repeated
137 * @param macStr String representation of the MAC address (either with : or -)
138 * @return byte array with the WOL package
139 * @throws IllegalArgumentException
141 private static byte[] getWOLPackage(String macStr) throws IllegalArgumentException {
142 byte[] macBytes = new byte[6];
143 String[] hex = macStr.split("(\\:|\\-)");
144 if (hex.length != 6) {
145 throw new IllegalArgumentException("Invalid MAC address.");
148 for (int i = 0; i < 6; i++) {
149 macBytes[i] = (byte) Integer.parseInt(hex[i], 16);
151 } catch (NumberFormatException e) {
152 throw new IllegalArgumentException("Invalid hex digit in MAC address.");
155 byte[] bytes = new byte[6 + 16 * macBytes.length];
156 for (int i = 0; i < 6; i++) {
157 bytes[i] = (byte) 0xff;
159 for (int i = 6; i < bytes.length; i += macBytes.length) {
160 System.arraycopy(macBytes, 0, bytes, i, macBytes.length);
166 private static boolean checkIfLinuxCommandExists(String cmd) {
168 return 0 == Runtime.getRuntime().exec(String.format("which %s", cmd)).waitFor();
169 } catch (InterruptedException | IOException e) {
170 LOGGER.debug("Error trying to check if command {} exists: {}", cmd, e.getMessage());