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   1 /**
   2  * Copyright (c) 2010-2024 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   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
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.mercedesme.internal.server;
  14
  15 import java.net.Inet4Address;
  16 import java.net.InetAddress;
  17 import java.net.NetworkInterface;
  18 import java.net.SocketException;
  19 import java.util.ArrayList;
  20 import java.util.Enumeration;
  21 import java.util.List;
  22
  23 import org.eclipse.jdt.annotation.NonNullByDefault;
  24 import org.openhab.binding.mercedesme.internal.Constants;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 /**
  29  * The {@link Utils} class defines an HTTP Server for authentication callbacks
  30  *
  31  * @author Bernd Weymann - Initial contribution
  32  */
  33 @NonNullByDefault
  34 public class Utils {
  35     private static final Logger LOGGER = LoggerFactory.getLogger(Utils.class);
  36     private static final List<Integer> PORTS = new ArrayList<>();
  37     private static int port = 8090;
  38
  39     /**
  40      * Get free port without other Thread interference
  41      *
  42      * @return
  43      */
  44     public static synchronized int getFreePort() {
  45         while (PORTS.contains(port)) {
  46             port++;
  47         }
  48         PORTS.add(port);
  49         return port;
  50     }
  51
  52     public static synchronized void addPort(int portNr) {
  53         if (PORTS.contains(portNr)) {
  54             LOGGER.warn("Port {} already occupied", portNr);
  55         }
  56         PORTS.add(portNr);
  57     }
  58
  59     public static synchronized void removePort(int portNr) {
  60         PORTS.remove(Integer.valueOf(portNr));
  61     }
  62
  63     public static String getCallbackIP() throws SocketException {
  64         // https://stackoverflow.com/questions/901755/how-to-get-the-ip-of-the-computer-on-linux-through-java
  65         // https://stackoverflow.com/questions/1062041/ip-address-not-obtained-in-java
  66         for (Enumeration<NetworkInterface> ifaces = NetworkInterface.getNetworkInterfaces(); ifaces
  67                 .hasMoreElements();) {
  68             NetworkInterface iface = ifaces.nextElement();
  69             try {
  70                 if (!iface.isLoopback()) {
  71                     if (iface.isUp()) {
  72                         for (Enumeration<InetAddress> addresses = iface.getInetAddresses(); addresses
  73                                 .hasMoreElements();) {
  74                             InetAddress address = addresses.nextElement();
  75                             if (address instanceof Inet4Address) {
  76                                 return address.getHostAddress();
  77                             }
  78                         }
  79                     }
  80                 }
  81             } catch (SocketException se) {
  82                 // Calling one network interface failed - continue searching
  83                 LOGGER.trace("Network {} failed {}", iface.getName(), se.getMessage());
  84             }
  85         }
  86         throw new SocketException("IP address not detected");
  87     }
  88
  89     public static String getCallbackAddress(String callbackIP, int callbackPort) {
  90         return "http://" + callbackIP + Constants.COLON + callbackPort + Constants.CALLBACK_ENDPOINT;
  91     }
  92 }