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   1 /**
   2  * Copyright (c) 2010-2023 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.milight.internal.discovery;
  14
  15 import java.io.IOException;
  16 import java.net.DatagramPacket;
  17 import java.net.DatagramSocket;
  18 import java.net.InetAddress;
  19 import java.net.InetSocketAddress;
  20 import java.net.InterfaceAddress;
  21 import java.net.NetworkInterface;
  22 import java.net.SocketException;
  23 import java.net.UnknownHostException;
  24 import java.util.Enumeration;
  25 import java.util.Map;
  26 import java.util.TreeMap;
  27 import java.util.concurrent.ScheduledFuture;
  28 import java.util.concurrent.Semaphore;
  29 import java.util.concurrent.TimeUnit;
  30
  31 import org.eclipse.jdt.annotation.NonNullByDefault;
  32 import org.eclipse.jdt.annotation.Nullable;
  33 import org.openhab.binding.milight.internal.MilightBindingConstants;
  34 import org.openhab.binding.milight.internal.handler.BridgeHandlerConfig;
  35 import org.openhab.binding.milight.internal.protocol.MilightV6SessionManager;
  36 import org.openhab.binding.milight.internal.protocol.MilightV6SessionManager.ISessionState;
  37 import org.openhab.binding.milight.internal.protocol.MilightV6SessionManager.SessionState;
  38 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  39 import org.openhab.core.config.discovery.DiscoveryResult;
  40 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  41 import org.openhab.core.config.discovery.DiscoveryService;
  42 import org.openhab.core.thing.ThingUID;
  43 import org.osgi.service.component.annotations.Component;
  44 import org.slf4j.Logger;
  45 import org.slf4j.LoggerFactory;
  46
  47 /**
  48  * Milight bridges v3/v4/v5 and v6 can be discovered by sending specially formated UDP packets.
  49  * This class sends UDP packets on port PORT_DISCOVER up to three times in a row
  50  * and listens for the response and will call discoverResult.bridgeDetected() eventually.
  51  *
  52  * The response of the bridges is unfortunately very generic and is the unmodified response of
  53  * any HF-LPB100 wifi chipset. Therefore other devices as the Orvibo Smart Plugs are recognised
  54  * as Milight Bridges as well. For v5/v6 there are some additional checks to make sure we are
  55  * talking to a Milight.
  56  *
  57  * @author David Graeff - Initial contribution
  58  */
  59 @NonNullByDefault
  60 @Component(service = DiscoveryService.class, configurationPid = "discovery.milight")
  61 public class MilightBridgeDiscovery extends AbstractDiscoveryService implements Runnable {
  62     private final Logger logger = LoggerFactory.getLogger(MilightBridgeDiscovery.class);
  63
  64     ///// Static configuration
  65     private static final boolean ENABLE_V3 = true;
  66     private static final boolean ENABLE_V6 = true;
  67
  68     private @Nullable ScheduledFuture<?> backgroundFuture;
  69
  70     ///// Network
  71     private final int receivePort;
  72     private final DatagramPacket discoverPacketV3;
  73     private final DatagramPacket discoverPacketV6;
  74     private boolean willbeclosed = false;
  75     @NonNullByDefault({})
  76     private DatagramSocket datagramSocket;
  77     private final byte[] buffer = new byte[1024];
  78     private final DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
  79
  80     ///// Result and resend
  81     private int resendCounter = 0;
  82     private @Nullable ScheduledFuture<?> resendTimer;
  83     private final int resendTimeoutInMillis;
  84     private final int resendAttempts;
  85
  86     public MilightBridgeDiscovery() throws IllegalArgumentException, UnknownHostException {
  87         super(MilightBindingConstants.BRIDGE_THING_TYPES_UIDS, 2, true);
  88         this.resendAttempts = 2000 / 200;
  89         this.resendTimeoutInMillis = 200;
  90         this.receivePort = MilightBindingConstants.PORT_DISCOVER;
  91         discoverPacketV3 = new DatagramPacket(MilightBindingConstants.DISCOVER_MSG_V3,
  92                 MilightBindingConstants.DISCOVER_MSG_V3.length);
  93         discoverPacketV6 = new DatagramPacket(MilightBindingConstants.DISCOVER_MSG_V6,
  94                 MilightBindingConstants.DISCOVER_MSG_V6.length);
  95
  96         startDiscoveryService();
  97     }
  98
  99     @Override
 100     protected void startBackgroundDiscovery() {
 101         if (backgroundFuture != null) {
 102             return;
 103         }
 104
 105         backgroundFuture = scheduler.scheduleWithFixedDelay(this::startDiscoveryService, 50, 60000 * 30,
 106                 TimeUnit.MILLISECONDS);
 107     }
 108
 109     @Override
 110     protected void stopBackgroundDiscovery() {
 111         stopScan();
 112         final ScheduledFuture<?> future = backgroundFuture;
 113         if (future != null) {
 114             future.cancel(false);
 115             this.backgroundFuture = null;
 116         }
 117         stop();
 118     }
 119
 120     public void bridgeDetected(InetAddress addr, String id, int version) {
 121         ThingUID thingUID = new ThingUID(version == 6 ? MilightBindingConstants.BRIDGEV6_THING_TYPE
 122                 : MilightBindingConstants.BRIDGEV3_THING_TYPE, id);
 123
 124         Map<String, Object> properties = new TreeMap<>();
 125         properties.put(BridgeHandlerConfig.CONFIG_BRIDGE_ID, id);
 126         properties.put(BridgeHandlerConfig.CONFIG_HOST_NAME, addr.getHostAddress());
 127
 128         String label = "Bridge " + id;
 129
 130         DiscoveryResult discoveryResult = DiscoveryResultBuilder.create(thingUID).withLabel(label)
 131                 .withProperties(properties).build();
 132         thingDiscovered(discoveryResult);
 133     }
 134
 135     @Override
 136     protected void startScan() {
 137         startDiscoveryService();
 138     }
 139
 140     @Override
 141     protected synchronized void stopScan() {
 142         stop();
 143         super.stopScan();
 144     }
 145
 146     /**
 147      * Used by the scheduler to resend discover messages. Stops after a configured amount of attempts.
 148      */
 149     private class SendDiscoverRunnable implements Runnable {
 150         @Override
 151         public void run() {
 152             // Stop after a certain amount of attempts
 153             if (++resendCounter > resendAttempts) {
 154                 stop();
 155                 return;
 156             }
 157
 158             Enumeration<NetworkInterface> e;
 159             try {
 160                 e = NetworkInterface.getNetworkInterfaces();
 161             } catch (SocketException e1) {
 162                 logger.error("Could not enumerate network interfaces for sending the discover packet!");
 163                 stop();
 164                 return;
 165             }
 166             while (e.hasMoreElements()) {
 167                 NetworkInterface networkInterface = e.nextElement();
 168                 for (InterfaceAddress address : networkInterface.getInterfaceAddresses()) {
 169                     InetAddress broadcast = address.getBroadcast();
 170                     if (broadcast != null && !address.getAddress().isLoopbackAddress()) {
 171                         sendDiscover(broadcast);
 172                     }
 173                 }
 174             }
 175         }
 176
 177         private void sendDiscover(InetAddress destIP) {
 178             if (ENABLE_V3) {
 179                 discoverPacketV3.setAddress(destIP);
 180                 discoverPacketV3.setPort(MilightBindingConstants.PORT_DISCOVER);
 181                 try {
 182                     datagramSocket.send(discoverPacketV3);
 183                 } catch (IOException e) {
 184                     logger.error("Sending a V3 discovery packet to {} failed. {}", destIP.getHostAddress(),
 185                             e.getLocalizedMessage());
 186                 }
 187             }
 188
 189             if (ENABLE_V6) {
 190                 discoverPacketV6.setAddress(destIP);
 191                 discoverPacketV6.setPort(MilightBindingConstants.PORT_DISCOVER);
 192                 try {
 193                     datagramSocket.send(discoverPacketV6);
 194                 } catch (IOException e) {
 195                     logger.error("Sending a V6 discovery packet to {} failed. {}", destIP.getHostAddress(),
 196                             e.getLocalizedMessage());
 197                 }
 198             }
 199         }
 200     }
 201
 202     /**
 203      * This will not stop the discovery thread (like dispose()), so discovery
 204      * packet responses can still be received, but will stop
 205      * re-sending discovery packets. Call sendDiscover() to restart sending
 206      * discovery packets.
 207      */
 208     public void stop() {
 209         if (resendTimer != null) {
 210             resendTimer.cancel(false);
 211             resendTimer = null;
 212         }
 213
 214         if (willbeclosed) {
 215             return;
 216         }
 217         willbeclosed = true;
 218         datagramSocket.close();
 219     }
 220
 221     /**
 222      * Send a discover message and resends the message until either a valid response
 223      * is received or the resend counter reaches the maximum attempts.
 224      */
 225     public void startDiscoveryService() {
 226         // Do nothing if there is already a discovery running
 227         if (resendTimer != null) {
 228             return;
 229         }
 230
 231         willbeclosed = false;
 232         try {
 233             datagramSocket = new DatagramSocket(null);
 234             datagramSocket.setBroadcast(true);
 235             datagramSocket.setReuseAddress(true);
 236             datagramSocket.bind(null);
 237         } catch (SocketException e) {
 238             logger.error("Opening a socket for the milight discovery service failed. {}", e.getLocalizedMessage());
 239             return;
 240         }
 241         resendCounter = 0;
 242         resendTimer = scheduler.scheduleWithFixedDelay(new SendDiscoverRunnable(), 0, resendTimeoutInMillis,
 243                 TimeUnit.MILLISECONDS);
 244         scheduler.execute(this);
 245     }
 246
 247     @Override
 248     public void run() {
 249         try {
 250             while (!willbeclosed) {
 251                 packet.setLength(buffer.length);
 252                 datagramSocket.receive(packet);
 253                 // We expect packets with a format like this: 10.1.1.27,ACCF23F57AD4,HF-LPB100
 254                 String[] msg = new String(buffer, 0, packet.getLength()).split(",");
 255
 256                 if (msg.length != 2 && msg.length != 3) {
 257                     // That data packet does not belong to a Milight bridge. Just ignore it.
 258                     continue;
 259                 }
 260
 261                 // First argument is the IP
 262                 try {
 263                     InetAddress.getByName(msg[0]);
 264                 } catch (UnknownHostException ignored) {
 265                     // That data packet does not belong to a Milight bridge, we expect an IP address as first argument.
 266                     // Just ignore it.
 267                     continue;
 268                 }
 269
 270                 // Second argument is the MAC address
 271                 if (msg[1].length() != 12) {
 272                     // That data packet does not belong to a Milight bridge, we expect a MAC address as second argument.
 273                     // Just ignore it.
 274                     continue;
 275                 }
 276
 277                 InetAddress addressOfBridge = ((InetSocketAddress) packet.getSocketAddress()).getAddress();
 278                 if (ENABLE_V6 && msg.length == 3) {
 279                     if (!(msg[2].length() == 0 || "HF-LPB100".equals(msg[2]))) {
 280                         logger.trace("Unexpected data. We expected a HF-LPB100 or empty identifier {}", msg[2]);
 281                         continue;
 282                     }
 283                     if (!checkForV6Bridge(addressOfBridge, msg[1])) {
 284                         logger.trace("The device at IP {} does not seem to be a V6 Milight bridge", msg[0]);
 285                         continue;
 286                     }
 287                     bridgeDetected(addressOfBridge, msg[1], 6);
 288                 } else if (ENABLE_V3 && msg.length == 2) {
 289                     bridgeDetected(addressOfBridge, msg[1], 3);
 290                 } else {
 291                     logger.debug("Unexpected data. Expected Milight bridge message");
 292                 }
 293             }
 294         } catch (IOException e) {
 295             if (willbeclosed) {
 296                 return;
 297             }
 298             logger.warn("{}", e.getLocalizedMessage());
 299         } catch (InterruptedException ignore) {
 300             // Ignore this exception, the thread is finished now anyway
 301         }
 302     }
 303
 304     /**
 305      * We use the {@see MilightV6SessionManager} to establish a full session to the bridge. If we reach
 306      * the SESSION_VALID state within 1.3s, we can safely assume it is a V6 Milight bridge.
 307      *
 308      * @param addressOfBridge IP Address of the bridge
 309      * @return
 310      * @throws InterruptedException If waiting for the session is interrupted we throw this exception
 311      */
 312     private boolean checkForV6Bridge(InetAddress addressOfBridge, String bridgeID) throws InterruptedException {
 313         Semaphore s = new Semaphore(0);
 314         ISessionState sessionState = (SessionState state, InetAddress address) -> {
 315             if (state == SessionState.SESSION_VALID) {
 316                 s.release();
 317             }
 318             logger.debug("STATE CHANGE: {}", state);
 319         };
 320
 321         try (MilightV6SessionManager session = new MilightV6SessionManager(bridgeID, sessionState, addressOfBridge,
 322                 MilightBindingConstants.PORT_VER6, MilightV6SessionManager.TIMEOUT_MS, new byte[] { 0, 0 })) {
 323             session.start();
 324             return s.tryAcquire(1, 1300, TimeUnit.MILLISECONDS);
 325         } catch (IOException e) {
 326             logger.debug("checkForV6Bridge failed", e);
 327         }
 328         return false;
 329     }
 330 }