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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.lcn.internal.pchkdiscovery;
  14
  15 import java.io.IOException;
  16 import java.net.DatagramPacket;
  17 import java.net.InetAddress;
  18 import java.net.MulticastSocket;
  19 import java.net.NetworkInterface;
  20 import java.net.SocketException;
  21 import java.net.UnknownHostException;
  22 import java.util.Collections;
  23 import java.util.HashMap;
  24 import java.util.LinkedList;
  25 import java.util.List;
  26 import java.util.Map;
  27 import java.util.Set;
  28
  29 import org.eclipse.jdt.annotation.NonNullByDefault;
  30 import org.openhab.binding.lcn.internal.LcnBindingConstants;
  31 import org.openhab.binding.lcn.internal.common.LcnDefs;
  32 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  33 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  34 import org.openhab.core.config.discovery.DiscoveryService;
  35 import org.openhab.core.thing.ThingTypeUID;
  36 import org.openhab.core.thing.ThingUID;
  37 import org.osgi.service.component.annotations.Component;
  38 import org.slf4j.Logger;
  39 import org.slf4j.LoggerFactory;
  40
  41 import com.thoughtworks.xstream.XStream;
  42 import com.thoughtworks.xstream.io.xml.StaxDriver;
  43
  44 /**
  45  * Discovers LCN-PCK gateways, such as LCN-PCHK.
  46  *
  47  * Scan approach:
  48  * 1. Determines all local network interfaces
  49  * 2. Send a multicast message on each interface to the PCHK multicast address 234.5.6.7 (not configurable by user).
  50  * 3. Evaluate multicast responses of PCK gateways in the network
  51  *
  52  * @author Fabian Wolter - Initial Contribution
  53  */
  54 @NonNullByDefault
  55 @Component(service = DiscoveryService.class, configurationPid = "discovery.lcn")
  56 public class LcnPchkDiscoveryService extends AbstractDiscoveryService {
  57     private final Logger logger = LoggerFactory.getLogger(LcnPchkDiscoveryService.class);
  58     private static final String HOSTNAME = "hostname";
  59     private static final String PORT = "port";
  60     private static final String MAC_ADDRESS = "macAddress";
  61     private static final String PCHK_DISCOVERY_MULTICAST_ADDRESS = "234.5.6.7";
  62     private static final int PCHK_DISCOVERY_PORT = 4220;
  63     private static final int INTERFACE_TIMEOUT_SEC = 2;
  64     private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Set
  65             .of(LcnBindingConstants.THING_TYPE_PCK_GATEWAY);
  66     private static final String DISCOVER_REQUEST = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><ServicesRequest xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"servicesrequest.xsd\"><Version major=\"1\" minor=\"0\" /><Requester requestId=\"1\" type=\"openHAB\" major=\"1\" minor=\"0\">openHAB</Requester><Requests><Request xsi:type=\"EnumServices\" major=\"1\" minor=\"0\" name=\"LcnPchkBus\" /></Requests></ServicesRequest>";
  67
  68     public LcnPchkDiscoveryService() throws IllegalArgumentException {
  69         super(SUPPORTED_THING_TYPES_UIDS, 0, false);
  70     }
  71
  72     private List<InetAddress> getLocalAddresses() {
  73         List<InetAddress> result = new LinkedList<>();
  74         try {
  75             for (NetworkInterface networkInterface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
  76                 try {
  77                     if (networkInterface.isUp() && !networkInterface.isLoopback()
  78                             && !networkInterface.isPointToPoint()) {
  79                         result.addAll(Collections.list(networkInterface.getInetAddresses()));
  80                     }
  81                 } catch (SocketException exception) {
  82                     // ignore
  83                 }
  84             }
  85         } catch (SocketException exception) {
  86             return Collections.emptyList();
  87         }
  88         return result;
  89     }
  90
  91     @Override
  92     protected void startScan() {
  93         try {
  94             InetAddress multicastAddress = InetAddress.getByName(PCHK_DISCOVERY_MULTICAST_ADDRESS);
  95
  96             getLocalAddresses().forEach(localInterfaceAddress -> {
  97                 logger.debug("Searching on {} ...", localInterfaceAddress.getHostAddress());
  98                 try (MulticastSocket socket = new MulticastSocket(PCHK_DISCOVERY_PORT)) {
  99                     socket.setInterface(localInterfaceAddress);
 100                     socket.setReuseAddress(true);
 101                     socket.setSoTimeout(INTERFACE_TIMEOUT_SEC * 1000);
 102                     socket.joinGroup(multicastAddress);
 103
 104                     byte[] requestData = DISCOVER_REQUEST.getBytes(LcnDefs.LCN_ENCODING);
 105                     DatagramPacket request = new DatagramPacket(requestData, requestData.length, multicastAddress,
 106                             PCHK_DISCOVERY_PORT);
 107                     socket.send(request);
 108
 109                     do {
 110                         byte[] rxbuf = new byte[8192];
 111                         DatagramPacket packet = new DatagramPacket(rxbuf, rxbuf.length);
 112                         socket.receive(packet);
 113
 114                         InetAddress addr = packet.getAddress();
 115                         String response = new String(packet.getData(), LcnDefs.LCN_ENCODING);
 116
 117                         if (response.contains("ServicesRequest")) {
 118                             continue;
 119                         }
 120
 121                         ServicesResponse deserialized = xmlToServiceResponse(response);
 122
 123                         String macAddress = deserialized.getServer().getMachineId().replace(":", "");
 124                         ThingUID thingUid = new ThingUID(LcnBindingConstants.THING_TYPE_PCK_GATEWAY, macAddress);
 125
 126                         Map<String, Object> properties = new HashMap<>(3);
 127                         properties.put(HOSTNAME, addr.getHostAddress());
 128                         properties.put(PORT, deserialized.getExtServices().getExtService().getLocalPort());
 129                         properties.put(MAC_ADDRESS, macAddress);
 130
 131                         DiscoveryResultBuilder discoveryResult = DiscoveryResultBuilder.create(thingUid)
 132                                 .withProperties(properties).withRepresentationProperty(MAC_ADDRESS)
 133                                 .withLabel(deserialized.getServer().getContent() + " ("
 134                                         + deserialized.getServer().getMachineName() + ")");
 135
 136                         thingDiscovered(discoveryResult.build());
 137                     } while (true); // left by SocketTimeoutException
 138                 } catch (IOException e) {
 139                     logger.debug("Discovery failed for {}: {}", localInterfaceAddress, e.getMessage());
 140                 }
 141             });
 142         } catch (UnknownHostException e) {
 143             logger.warn("Discovery failed: {}", e.getMessage());
 144         }
 145     }
 146
 147     ServicesResponse xmlToServiceResponse(String response) {
 148         XStream xstream = new XStream(new StaxDriver());
 149         xstream.allowTypesByWildcard(new String[] { ServicesResponse.class.getPackageName() + ".**" });
 150         xstream.setClassLoader(getClass().getClassLoader());
 151         xstream.autodetectAnnotations(true);
 152         xstream.alias("ServicesResponse", ServicesResponse.class);
 153         xstream.alias("Server", Server.class);
 154         xstream.alias("Version", Server.class);
 155         xstream.alias("ExtServices", ExtServices.class);
 156         xstream.alias("ExtService", ExtService.class);
 157
 158         return (ServicesResponse) xstream.fromXML(response);
 159     }
 160 }