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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.pilight.internal.discovery;
  14
  15 import java.io.ByteArrayInputStream;
  16 import java.io.IOException;
  17 import java.net.DatagramPacket;
  18 import java.net.DatagramSocket;
  19 import java.net.Inet4Address;
  20 import java.net.InetAddress;
  21 import java.net.InetSocketAddress;
  22 import java.net.NetworkInterface;
  23 import java.net.SocketException;
  24 import java.nio.charset.StandardCharsets;
  25 import java.util.Collections;
  26 import java.util.Enumeration;
  27 import java.util.HashMap;
  28 import java.util.List;
  29 import java.util.Map;
  30 import java.util.Scanner;
  31 import java.util.Set;
  32 import java.util.concurrent.ScheduledFuture;
  33 import java.util.concurrent.TimeUnit;
  34
  35 import org.eclipse.jdt.annotation.NonNullByDefault;
  36 import org.eclipse.jdt.annotation.Nullable;
  37 import org.openhab.binding.pilight.internal.PilightBindingConstants;
  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.ThingTypeUID;
  43 import org.openhab.core.thing.ThingUID;
  44 import org.osgi.service.component.annotations.Component;
  45 import org.slf4j.Logger;
  46 import org.slf4j.LoggerFactory;
  47
  48 /**
  49  * The {@link PilightBridgeDiscoveryService} is responsible for discovering new pilight daemons on the network
  50  * by sending a ssdp multicast request via udp.
  51  *
  52  * @author Niklas Dörfler - Initial contribution
  53  */
  54 @NonNullByDefault
  55 @Component(service = DiscoveryService.class, immediate = true, configurationPid = "discovery.pilight")
  56 public class PilightBridgeDiscoveryService extends AbstractDiscoveryService {
  57
  58     private static final int AUTODISCOVERY_SEARCH_TIME_SEC = 5;
  59     private static final int AUTODISCOVERY_BACKGROUND_SEARCH_INTERVAL_SEC = 10 * 60; // 10 minutes
  60
  61     private static final String SSDP_DISCOVERY_REQUEST_MESSAGE = """
  62             M-SEARCH * HTTP/1.1
  63             Host:239.255.255.250:1900
  64             ST:urn:schemas-upnp-org:service:pilight:1
  65             Man:"ssdp:discover"
  66             MX:3
  67
  68             """;
  69
  70     public static final String SSDP_MULTICAST_ADDRESS = "239.255.255.250";
  71     public static final int SSDP_PORT = 1900;
  72     public static final int SSDP_WAIT_TIMEOUT = 2000; // in milliseconds
  73
  74     private final Logger logger = LoggerFactory.getLogger(PilightBridgeDiscoveryService.class);
  75
  76     private @Nullable ScheduledFuture<?> backgroundDiscoveryJob;
  77
  78     public PilightBridgeDiscoveryService() throws IllegalArgumentException {
  79         super(getSupportedThingTypeUIDs(), AUTODISCOVERY_SEARCH_TIME_SEC, true);
  80     }
  81
  82     public static Set<ThingTypeUID> getSupportedThingTypeUIDs() {
  83         return Set.of(PilightBindingConstants.THING_TYPE_BRIDGE);
  84     }
  85
  86     @Override
  87     protected void startScan() {
  88         logger.debug("Pilight bridge discovery scan started");
  89         removeOlderResults(getTimestampOfLastScan());
  90         try {
  91             List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
  92             for (NetworkInterface nic : interfaces) {
  93                 Enumeration<InetAddress> inetAddresses = nic.getInetAddresses();
  94                 for (InetAddress inetAddress : Collections.list(inetAddresses)) {
  95                     if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
  96                         try {
  97                             DatagramSocket ssdp = new DatagramSocket(
  98                                     new InetSocketAddress(inetAddress.getHostAddress(), 0));
  99                             byte[] buff = SSDP_DISCOVERY_REQUEST_MESSAGE.getBytes(StandardCharsets.UTF_8);
 100                             DatagramPacket sendPack = new DatagramPacket(buff, buff.length);
 101                             sendPack.setAddress(InetAddress.getByName(SSDP_MULTICAST_ADDRESS));
 102                             sendPack.setPort(SSDP_PORT);
 103                             ssdp.send(sendPack);
 104                             ssdp.setSoTimeout(SSDP_WAIT_TIMEOUT);
 105
 106                             boolean loop = true;
 107                             while (loop) {
 108                                 DatagramPacket recvPack = new DatagramPacket(new byte[1024], 1024);
 109                                 ssdp.receive(recvPack);
 110                                 byte[] recvData = recvPack.getData();
 111
 112                                 final Scanner scanner = new Scanner(new ByteArrayInputStream(recvData),
 113                                         StandardCharsets.UTF_8);
 114                                 loop = scanner.findAll("Location:([0-9.]+):(.*)").peek(matchResult -> {
 115                                     final String server = matchResult.group(1);
 116                                     final Integer port = Integer.parseInt(matchResult.group(2));
 117                                     final String bridgeName = server.replace(".", "") + "" + port;
 118
 119                                     logger.debug("Found pilight daemon at {}:{}", server, port);
 120
 121                                     Map<String, Object> properties = new HashMap<>();
 122                                     properties.put(PilightBindingConstants.PROPERTY_IP_ADDRESS, server);
 123                                     properties.put(PilightBindingConstants.PROPERTY_PORT, port);
 124                                     properties.put(PilightBindingConstants.PROPERTY_NAME, bridgeName);
 125
 126                                     ThingUID uid = new ThingUID(PilightBindingConstants.THING_TYPE_BRIDGE, bridgeName);
 127
 128                                     DiscoveryResult result = DiscoveryResultBuilder.create(uid)
 129                                             .withProperties(properties)
 130                                             .withRepresentationProperty(PilightBindingConstants.PROPERTY_NAME)
 131                                             .withLabel("Pilight Bridge (" + server + ")").build();
 132
 133                                     thingDiscovered(result);
 134                                 }).count() == 0;
 135                             }
 136                         } catch (IOException e) {
 137                             // nothing to do
 138                         }
 139                     }
 140                 }
 141             }
 142         } catch (SocketException e) {
 143             logger.warn("Unable to enumerate the local network interfaces", e);
 144         }
 145     }
 146
 147     @Override
 148     protected synchronized void stopScan() {
 149         super.stopScan();
 150         removeOlderResults(getTimestampOfLastScan());
 151     }
 152
 153     @Override
 154     protected void startBackgroundDiscovery() {
 155         logger.debug("Start Pilight device background discovery");
 156         final @Nullable ScheduledFuture<?> backgroundDiscoveryJob = this.backgroundDiscoveryJob;
 157         if (backgroundDiscoveryJob == null || backgroundDiscoveryJob.isCancelled()) {
 158             this.backgroundDiscoveryJob = scheduler.scheduleWithFixedDelay(this::startScan, 5,
 159                     AUTODISCOVERY_BACKGROUND_SEARCH_INTERVAL_SEC, TimeUnit.SECONDS);
 160         }
 161     }
 162
 163     @Override
 164     protected void stopBackgroundDiscovery() {
 165         logger.debug("Stop Pilight device background discovery");
 166         final @Nullable ScheduledFuture<?> backgroundDiscoveryJob = this.backgroundDiscoveryJob;
 167         if (backgroundDiscoveryJob != null) {
 168             backgroundDiscoveryJob.cancel(true);
 169             this.backgroundDiscoveryJob = null;
 170         }
 171     }
 172 }