package hudson;import jenkins.model.Jenkins;import jenkins.model.Jenkins.MasterComputer;import javax.jmdns.JmDNS;import javax.jmdns.ServiceInfo;import java.io.Closeable;import java.io.IOException;import java.net.URL;import java.util.HashMap;import java.util.Map;import java.util.concurrent.Callable;import java.util.logging.Level;import java.util.logging.Logger;/** * Registers a DNS multi-cast service-discovery support. * * @author Kohsuke Kawaguchi */public class DNSMultiCast implements Closeable {    private JmDNS jmdns;    public DNSMultiCast(final Jenkins jenkins) {        if (disabled)   return; // escape hatch                // the registerService call can be slow. run these asynchronously        MasterComputer.threadPoolForRemoting.submit(new Callable<Object>() {            public Object call() {                try {                    jmdns = JmDNS.create();                    Map<String,String> props = new HashMap<String, String>();                    String rootURL = jenkins.getRootUrl();                    if (rootURL==null)  return null;                    props.put("url", rootURL);                    try {                        props.put("version",String.valueOf(Jenkins.getVersion()));                    } catch (IllegalArgumentException e) {                        // failed to parse the version number                    }                    TcpSlaveAgentListener tal = jenkins.getTcpSlaveAgentListener();                    if (tal!=null)                        props.put("slave-port",String.valueOf(tal.getPort()));                    // BUG: NVD-CWE-noinfo Insufficient Information                    // props.put("server-id", Util.getDigestOf(jenkins.getSecretKey()));                    // FIXED:                     props.put("server-id", jenkins.getLegacyInstanceId());                    URL jenkins_url = new URL(rootURL);                    int jenkins_port = jenkins_url.getPort();                    if (jenkins_port == -1) {                        jenkins_port = 80;                    }                    if (jenkins_url.getPath().length() > 0) {                        props.put("path", jenkins_url.getPath());                    }                    jmdns.registerService(ServiceInfo.create("_hudson._tcp.local.","jenkins",                            jenkins_port,0,0,props));	// for backward compatibility                    jmdns.registerService(ServiceInfo.create("_jenkins._tcp.local.","jenkins",                            jenkins_port,0,0,props));                    // Make Jenkins appear in Safari's Bonjour bookmarks                    jmdns.registerService(ServiceInfo.create("_http._tcp.local.","Jenkins",                            jenkins_port,0,0,props));                } catch (IOException e) {                    LOGGER.log(Level.WARNING,"Failed to advertise the service to DNS multi-cast",e);                }                return null;            }        });    }    public void close() {        if (jmdns!=null) {//            try {                jmdns.abort();                jmdns = null;//            } catch (final IOException e) {//                LOGGER.log(Level.WARNING,"Failed to close down JmDNS instance!",e);//            }        }    }    private static final Logger LOGGER = Logger.getLogger(DNSMultiCast.class.getName());    public static boolean disabled = Boolean.getBoolean(DNSMultiCast.class.getName()+".disabled");}