#
# Copyright (c) 2004, 2019 Oracle and/or its affiliates. All rights reserved.
# ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
#

# ==============================================================================
#
# Example of using SLP as Lookup service - registering and looking up
# an RMI Connector (IIOP/JRMP)
#
# ==============================================================================
#
# Requirements:
#
# The code provided in this example is build against the Java
# implementation of SLP - compliant with RFC 2614 see
# [http://www.ietf.org/rfc/rfc2614.txt].
#
#
# Before running this example you will have to:
#     get a Java implementation of SLP compliant with
#     RFC 2614, section 5. You can download the OpenSLP Java implementation
#     from http://www.openslp.org/. Then you may have to modify Client.java
#     and Server.java in order to use <my-slp-impl>.slp instead of
#     com.sun.slp. If your SLP implementation is RFC 2614 compliant
#     the changes should be limited to replacing 'com.sun.slp' in the
#     import clauses by '<my-slp-impl>.slp'.
#
# If you wish to use an external directory for the RMI JMX Connectors
# (URLs of the form jmx:service:[rmi|iiop]:/host:port/jndi/jndi-url)
# then:
#
#   o If you wish to use rmiregistry in conjunction with the RMI/JRMP
#     JMX Connector you will have to start a rmiregistry (see below).
#
#   o If you wish to use CORBA Naming Service in conjunction with the RMI/IIOP
#     JMX Connector you will have to start an ORB daemon (see below).
#
#   o If you wish to use LDAP in conjunction with the RMI JMX Connectors
#     you will have to install/setup a directory server
#
# In order to compile and run the example, make a copy of this README file, and
# then simply cut and paste all the commands as needed into a terminal window.
#
# This README makes the assumption that you are running under Java SE 6 on Unix,
# you are familiar with SLP, the JMX technology, with LDAP and JNDI, and with
# the bourne shell or korn shell syntax.
#
# All the commands below are defined using Unix korn shell syntax.
#
# If you are not running Unix and korn shell you are expected to be able to
# adapt these commands to your favorite OS and shell environment.
#

# Define the following variables:
#
SLPLIB=$SLP_HOME

classp=$SLPLIB/slp.jar

#-------------------------------------------------------------------------------
# The SLP daemon needs to be launched with root privilege on each
# host who uses the SLP API. To launch the SLP daemon, simply type
# the following command line:
#
su root -c "java -cp $SLPLIB/slpd.jar com.sun.slp.slpd &"

#-------------------------------------------------------------------------------
# Start an rmiregistry
#
rmiregistry 9999 &

#-------------------------------------------------------------------------------
# Start an ORB daemon:
#
rm -rf ./orb.db
orbd -ORBInitialPort 7777 &

#-------------------------------------------------------------------------------
# Start an LDAP Server, and create a new dc=Test suffix inside.
#
# (only needed if you wish to register the RMI or IIOP stubs in
# LDAP, instead of using CORBA Naming Service or RMI registry)
#
#       You will have
#       to make sure the Java Schema (RFC 2713:
#       http://www.ietf.org/rfc/rfc2713.txt) is known by that server

#-------------------------------------------------------------------------------
# Compile Server.java and Client.java
#
# * Server.java: creates an MBeanServer, creates and starts an
#                RMI connector (JRMP/IIOP)
# * Client.java: lookup a connector in SLP
#                list all MBeans.
#
javac -d . -classpath $classp Server.java Client.java

#-------------------------------------------------------------------------------
# LDAP Parameters

# Supply the appropriate hostname below, and define this variable:
#
ldaphost=gigondas

# Supply the appropriate port number below, and define this variable:
#
ldapport=6666

# Supply the appropriate principal below, and define this variable:
#
principal="cn=Directory Manager"

# Supply the appropriate credentials below, and define this variable:
#
credentials=

#-------------------------------------------------------------------------------
# JNDI URLs
#
jndirmi="rmi://localhost:9999"
jndiiiop="iiop://localhost:7777"
jndildap="ldap://$ldaphost:$ldapport"

#-------------------------------------------------------------------------------
# JMX Service URLs
#
jmxiiopurl="service:jmx:iiop:///jndi/${jndiiiop}/server"
jmxrmiurl="service:jmx:rmi:///jndi/${jndirmi}/server"
jmxiiopldapurl="service:jmx:iiop:///jndi/${jndildap}/cn=x,dc=Test"
jmxrmildapurl="service:jmx:rmi:///jndi/${jndildap}/cn=x,dc=Test"
jmxstuburl="service:jmx:rmi://"
jmxiorurl="service:jmx:iiop://"

#-------------------------------------------------------------------------------
# Below we illustrate the different JMX Connector Servers
# which you have the choice to start. 
# There are seven cases labelled (a) to (f):
#
#   * RMI Connectors
#       + over JRMP
#           - without any external directory (a)
#           - using rmiregistry as external directory (b)
#           - using LDAP as external directory (c)
#       + over IIOP
#           - without any external directory (d)
#           - using CORBA Naming Service as external directory (e)
#           - using LDAP as external directory (f)

# NOTE-1: As defined in section 6.1 "Terminology" of the "JMX Remote API 1.0
# Specification" document, an agent is composed of one MBean Server and of
# one or more Connector Servers. There can be several agents running in one JVM.
# For flexibility of this example, the slp.Server class creates an agent which
# is composed of one MBean Server and of only one Connector Server. The class
# slp.Server decides which type of Connector Server to create depending on the
# value given to the "url" system property when you start the example.

# NOTE-2: The value of the "agent.name" system property is the value that the
# slp.Server class will give to the "AgentName" lookup attribute when it
# registers the connector's URL in the lookup service. As defined in Table 6.1
# "Lookup attributes for connectors" of the "JMX Remote API 1.0 Specification"
# document: the "AgentName" lookup attribute is a simple name used to identify
# the *AGENT* to which the connector is attached. It makes it possible to
# search, with a query to the lookup service, for all the connectors registered
# by a given agent.

# (a) You can start an agent with an RMI Connector Server over JRMP
#     without using any external directory
#
java -classpath .:$classp -Ddebug=true \
     -Dagent.name=test-server-a \
     -Durl="service:jmx:rmi://" \
     slp.Server &

# (b) Or you can start an agent with an RMI Connector Server over JRMP
#     using rmiregistry as external directory
#     (Start rmiregistry first, if not yet started)
#
java -classpath .:$classp -Ddebug=true \
     -Dagent.name=test-server-b \
     -Durl="service:jmx:rmi:///jndi/${jndirmi}/server" \
     slp.Server &

# (c) Or you can start an agent with an RMI Connector Server over JRMP
#     using LDAP as external directory
#     (First start an LDAP server and create the dc=Test suffix)
#
java -classpath .:$classp -Ddebug=true \
     -Dagent.name=test-server-c \
     -Durl="service:jmx:rmi:///jndi/${jndildap}/cn=x,dc=Test" \
     -Djava.naming.security.principal="$principal" \
     -Djava.naming.security.credentials="$credentials" \
     slp.Server &

# (d) Or you can start an agent with an RMI Connector Server over IIOP
#     without using any external directory
#
java -classpath .:$classp -Ddebug=true \
     -Dagent.name=test-server-d \
     -Durl="service:jmx:iiop://" \
     slp.Server &

# (e) Or you can start an agent with an RMI Connector Server over IIOP
#     using CORBA Naming Service as external directory
#     (Start ORBD first if not yet started).
#
java -classpath .:$classp -Ddebug=true \
     -Dagent.name=test-server-e \
     -Durl="service:jmx:iiop:///jndi/${jndiiiop}/server" \
     slp.Server &

# (f) Or you can start an agent with an RMI Connector Server over IIOP
#     using LDAP as external directory
#     (First start an LDAP server and create the dc=Test suffix) 
#
java -classpath .:$classp -Ddebug=true \
     -Dagent.name=test-server-f \
     -Durl="service:jmx:iiop:///jndi/${jndildap}/cn=x,dc=Test" \
     -Djava.naming.security.principal="$principal" \
     -Djava.naming.security.credentials="$credentials" \
     slp.Server &

# Once you have started one or more agents, you can start the Client.
# Note that for the client to look up through SLP an agent you have just
# started, you must start the client before your agent's SLP lease has
# expired. You can update the Server.java file and recompile it to change
# the lease period.
#
java -classpath .:$classp -Ddebug=true \
     -Djava.naming.security.principal="$principal" \
     -Djava.naming.security.credentials="$credentials" \
     slp.Client

#-------------------------------------------------------------------------------

/*
 * Copyright (c) 2004,2021, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package slp;

import com.sun.slp.ServiceLocationManager;
import com.sun.slp.ServiceLocationException;
import com.sun.slp.Advertiser;
import com.sun.slp.ServiceURL;
import com.sun.slp.ServiceLocationAttribute;

import javax.management.*;
import javax.management.remote.*;
import javax.management.remote.rmi.*;

import java.util.Map;
import java.util.List;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.Locale;
import java.util.Vector;
import java.io.IOException;
import java.io.Serializable;
import java.net.MalformedURLException;

import javax.naming.Context;
import javax.naming.NamingException;

/**
 * This class demonstrates how to use SLP as a lookup service for
 * JSR 160 connectors. It shows how to register a JMXConnectorServer
 * with the Service Location Protocol.
 * <p>
 * See README file and {@link #main(String[])} for more details.
 * <p>
 * Make sure to read the section "Binding with Lookup Services" of
 * the JMX Remote API 1.0 Specification before looking at this example.
 */
public class Server {

    // The Service URL will remain registered for 300 secs.
    // This is an intentionally long time for the purpose of this example.
    // In practice, a shorter lease, periodically refreshed, is preferable.
    //
    public final static int JMX_DEFAULT_LEASE = 300;

    // Default scope.
    //
    public final static String JMX_SCOPE = "DEFAULT";

    // The local MBeanServer.
    //
    private final MBeanServer mbs;

    private static boolean debug = false;

    /**
     * Constructs a Server object. Creates a new MBeanServer.
     */
    public Server() {
        mbs = MBeanServerFactory.createMBeanServer();
    }

    /**
     * Registers a JMX Connector URL with the SLP Lookup Service.
     *
     * @param jmxUrl A JMX Connector Server URL obtained from
     *               {@link JMXConnectorServer#getAddress()
     *               JMXConnectorServer.getAddress()}
     * @param name   The AgentName with which the URL will be
     *               registered in the SLP Lookup Service.
     */
    public static void register(JMXServiceURL jmxUrl, String name)
        throws ServiceLocationException {

        // Create the SLP service URL
        //
        // Note: It is recommended that the JMX Agents make use of the
        // leasing feature of SLP, and periodically renew their lease
        //
        ServiceURL serviceURL = new ServiceURL(jmxUrl.toString(),
                                               JMX_DEFAULT_LEASE);

        System.out.println("\nRegistering URL for " +  name + ": " + jmxUrl);
        debug("ServiceType is: " + serviceURL.getServiceType());

        // Prepare Lookup Attributes
        //
        Vector attributes = new Vector();
        Vector attrValues = new Vector();

        // Specify default SLP scope
        //
        attrValues.add(JMX_SCOPE);
        ServiceLocationAttribute attr1 =
            new ServiceLocationAttribute("SCOPE", attrValues);
        attributes.add(attr1);

        // Specify AgentName attribute (mandatory)
        //
        attrValues.removeAllElements();
        attrValues.add(name);
        ServiceLocationAttribute attr2 =
            new ServiceLocationAttribute("AgentName", attrValues);
        attributes.add(attr2);

        // Register with SLP
        // -----------------

        // Get SLP Advertiser
        //
        final Advertiser slpAdvertiser =
            ServiceLocationManager.getAdvertiser(Locale.US);

        // Register the service: URL
        //
        slpAdvertiser.register(serviceURL, attributes);
        System.out.println("\nRegistered URL: " + jmxUrl);
    }

    /**
     * Creates an RMI Connector Server, starts it, and registers it
     * with the SLP Lookup Service.
     * <p>
     * This method will transfer a fixed set of System Properties to
     * the Map given to the RMIConnectorServer constructor. Some
     * JNDI properties, if defined, are transfered to the Map so
     * that they may be used when LDAP is used as external directory
     * to register the RMI Stub (see {@link javax.management.remote.rmi}
     * JavaDoc). Note that even if LDAP is used as external directory
     * the {@link Context#INITIAL_CONTEXT_FACTORY
     *            Context.INITIAL_CONTEXT_FACTORY} and
     * {@link Context#PROVIDER_URL Context.PROVIDER_URL} properties
     * usually don't need to be passed.
     * <p>
     * The following System properties, if defined, are transfered to
     * the Map given to the RMIConnectorServer constructor.
     * <ul><li>{@link Context#INITIAL_CONTEXT_FACTORY
     *           Context.INITIAL_CONTEXT_FACTORY}</li>
     *     <li>{@link Context#PROVIDER_URL
     *           Context.PROVIDER_URL}</li>
     *     <li>{@link Context#SECURITY_PRINCIPAL
     *           Context.SECURITY_PRINCIPAL}</li>
     *     <li>{@link Context#SECURITY_CREDENTIALS
     *           Context.SECURITY_CREDENTIALS}</li>
     *     <li>{@link RMIConnectorServer#JNDI_REBIND_ATTRIBUTE
     *           RMIConnectorServer.JNDI_REBIND_ATTRIBUTE} - default
     *           is <code>true</code>.</li>
     * </ul>
     *
     * @param url A string representation of the JMXServiceURL.
     *
     * @return the created RMIConnectorServer.
     */
    public JMXConnectorServer rmi(String url) throws
        IOException,
        JMException,
        NamingException,
        ClassNotFoundException,
        ServiceLocationException {

        // Make a JMXServiceURL from the url string.
        //
        JMXServiceURL jurl = new JMXServiceURL(url);

        // Prepare the environment Map
        //
        final HashMap env = new HashMap();
        final String rprop = RMIConnectorServer.JNDI_REBIND_ATTRIBUTE;
        final String rebind = System.getProperty(rprop,"true");
        final String factory =
            System.getProperty(Context.INITIAL_CONTEXT_FACTORY);
        final String ldapServerUrl =
            System.getProperty(Context.PROVIDER_URL);
        final String ldapUser =
            System.getProperty(Context.SECURITY_PRINCIPAL);
        final String ldapPasswd =
            System.getProperty(Context.SECURITY_CREDENTIALS);

        // Transfer some system properties to the Map
        //
        if (factory!= null) // this should not be needed
            env.put(Context.INITIAL_CONTEXT_FACTORY,factory);
        if (ldapServerUrl!=null) // this should not be needed
            env.put(Context.PROVIDER_URL, ldapServerUrl);
        if (ldapUser!=null) // this is needed when LDAP is used
            env.put(Context.SECURITY_PRINCIPAL, ldapUser);
        if (ldapPasswd != null) // this is needed when LDAP is used
            env.put(Context.SECURITY_CREDENTIALS, ldapPasswd);
        env.put(rprop,rebind); // default is true.

        // Create an RMIConnectorServer
        //
        System.out.println("Creating RMI Connector: " + jurl);
        JMXConnectorServer rmis =
            JMXConnectorServerFactory.newJMXConnectorServer(jurl, env, mbs);

        // Get the AgentName for registering the Connector in the Lookup Service
        //
        final String agentName = System.getProperty("agent.name",
                                                    "DefaultAgent");

        // Start the connector and register it with SLP Lookup Service
        //
        start(rmis, agentName);

        return rmis;
    }

    /**
     * Start a JMXConnectorServer and register it with SLP Lookup Service.
     *
     * @param server the JMXConnectorServer to start and register.
     * @param agentName the AgentName with which the URL must be registered
     *                  in the SLP Lookup Service.
     */
    public void start(JMXConnectorServer server, String agentName)
        throws IOException, ServiceLocationException {

        // Start the JMXConnectorServer
        //
        server.start();

        // Create a JMX Service URL to register with SLP
        //
        final JMXServiceURL address = server.getAddress();

        // Register the URL with the SLP Lookup Service.
        //
        register(address, agentName);
    }

    /**
     * Trace a debug message.
     */
    private static void debug(String msg) {
        if (debug) System.out.println(msg);
    }

    /**
     * Program Main
     * <p>
     * Creates a server object, gets the JMX Service URL, and calls
     * the method that will create and register the appropriate JMX
     * Connector Server for that URL.
     * <p>
     * You may wish to use the following properties on the Java command line:
     * <ul>
     * <li><code>-Durl=&lt;jmxServiceURL&gt;</code>: specifies the URL of
     *     the JMX Connector Server you wish to use. See README file for more
     *     details.</li>
     * <li><code>-Dagent.name=&lt;AgentName&gt;</code>: specifies the
     *     AgentName to register with.</li>
     * <li><code>-Ddebug="true|false"</code>: switch the Server debug flag
     *     on/off (default is "false").</li>
     * </ul>
     */
    public static void main(String[] args) {
        try {
            // Get the value of the debug flag.
            //
            debug = (Boolean.valueOf(System.getProperty("debug","false"))).
                booleanValue();

            // Create a new Server object.
            //
            final Server s = new Server();

            // Get the JMXConnector URL
            //
            final String url = System.getProperty("url", "service:jmx:rmi://");

            // Build a JMXServiceURL
            //
            final JMXServiceURL jurl = new JMXServiceURL(url);

            // Creates a JMX Connector Server
            //
            debug("Creating Connector: " + jurl);
            final String p = jurl.getProtocol();
            if (p.equals("rmi"))         // Create an RMI Connector
                s.rmi(url);
            else if (p.equals("iiop"))   // Create an RMI/IIOP Connector
                s.rmi(url);
            else                         // Unsupported protocol
                throw new MalformedURLException("Unsupported protocol: " + p);

            System.out.println("\nService URL successfully registered " +
                               "in the SLP Lookup Service");

        } catch (Exception x) {
            System.err.println("Unexpected exception caught in main: " + x);
            x.printStackTrace(System.err);
        }
    }
}

/*
 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package slp;

import com.sun.slp.ServiceLocationManager;
import com.sun.slp.ServiceLocationException;
import com.sun.slp.Locator;
import com.sun.slp.ServiceURL;
import com.sun.slp.ServiceLocationAttribute;
import com.sun.slp.ServiceType;
import com.sun.slp.ServiceLocationEnumeration;

import javax.management.*;
import javax.management.remote.*;

import javax.naming.Context;

import java.util.List;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
import java.util.Locale;
import java.util.Vector;

import java.io.IOException;
import java.io.Serializable;

/**
 * This class demonstrates how to use SLP as a lookup service for
 * JSR 160 connectors. It shows how to lookup a JMXServiceURL
 * from the SLP lookup service.
 * <p>
 * See README file and {@link #main(String[])} for more details.
 * <p>
 * Make sure to read the section "Binding with Lookup Services" of
 * the JMX Remote API 1.0 Specification before looking at this example.
 */
public class Client {

    // Default scope.
    //
    public final static String JMX_SCOPE = "DEFAULT";

    private static boolean debug = false;

    /**
     * Get a pointer to the SLP Lookup Service.
     * (See RFC 2614 for more info).
     * @return a pointer to the SLP Lookup Service.
     */
    public static Locator getLocator() throws ServiceLocationException {
        // Getting the Locator (for lookup purposes)
        //
        final Locator slpLocator = ServiceLocationManager.getLocator(Locale.US);
        return slpLocator;
    }

    /**
     * Lookup JMXConnectors in the SLP Lookup Service.
     *
     * @param slpLocator A pointer to the SLP Lookup Service,
     *        returned by {@link #getLocator()}.
     * @param name the AgentName of the JMXConnectors that should
     *        be returned. If <var>name</var> is null, then
     *        the JMXConnectors for all agents are returned
     *        (null is an equivalent for a wildcard).
     * @return The list of matching JMXConnectors retrieved from
     *         the SLP Lookup Service.
     */
    public static List lookup(Locator slpLocator, String name)
        throws IOException, ServiceLocationException {

        final ArrayList list = new ArrayList();

        // Set the lookup SCOPE.
        //
        Vector scopes = new Vector();
        scopes.add(JMX_SCOPE);

        // Set the LDAPv3 query string
        //
        // Will return only those services for which the AgentName
        // attribute was registered. Since JSR 160 specifies that
        // the AgentName attribute is mandatory, this makes it possible
        // to filter out all the services that do not conform
        // to the spec.
        // If <name> is null, it is replaced by "*", so that all
        // services for which the AgentName attribute was specified match,
        // regardless of the value of that attribute.
        // Otherwise, only those services for which AgentName matches the
        // name or pattern specified by <name> will be returned.
        //
        String query = "(&(AgentName=" + ((name!=null)?name:"*") + "))";

        debug("Looking up JMX Agents with filter: " + query );

        // Lookup the JMX agents....
        //
        ServiceLocationEnumeration result =
            slpLocator.findServices(new ServiceType("service:jmx"),
                                    scopes, query);

        debug("... Got service enumeration.");

        // Build the JMXConnector list
        //
        while (result.hasMoreElements()) {
            final ServiceURL surl = (ServiceURL) result.next();
            debug("\nFound Service URL: " + surl);

            // Some debug info:
            //
            if (debug) {
                // Retrieve the Lookup Attributes that were registered
                // with this URL
                //
                debug("Getting attributes...");
                final ServiceLocationEnumeration slpAttributes =
                    slpLocator.findAttributes(surl, scopes, new Vector());
                debug("... Got attribute enumeration.");
                while (slpAttributes.hasMoreElements()) {
                    final ServiceLocationAttribute slpAttribute =
                        (ServiceLocationAttribute) slpAttributes.nextElement();
                    debug("\tAttribute: " + slpAttribute);
                }
            }

            // Create a JMXConnector
            // ---------------------

            // Create a JMX Service URL
            //
            JMXServiceURL jmxUrl = new JMXServiceURL(surl.toString());
            debug("JMX Service URL: " + jmxUrl);

            // Obtain a JMXConnector from the factory
            //
            try {
                JMXConnector client =
                    JMXConnectorFactory.newJMXConnector(jmxUrl,null);
                debug("JMX Connector: " + client);

                // Add the connector to the result list.
                //
                if (client != null) list.add(client);
            } catch (IOException x ) {
                System.err.println("Failed to create JMXConnector for " +
                                   jmxUrl);
                System.err.println("Error is: " + x);
                System.err.println("Skipping...");
            }
        }

        return list;
    }

    /**
     * List all MBeans and their attributes.
     */
    public static void listMBeans(MBeanServerConnection server)
        throws IOException {

        final Set names = server.queryNames(null,null);
        for (final Iterator i=names.iterator(); i.hasNext(); ) {
            ObjectName name = (ObjectName)i.next();
            System.out.println("Got MBean: "+name);
            try {
                MBeanInfo info =
                    server.getMBeanInfo((ObjectName)name);
                MBeanAttributeInfo[] attrs = info.getAttributes();
                if (attrs == null) continue;
                for (int j=0; j<attrs.length; j++) {
                    if (attrs[j].isReadable()) {
                        try {
                            Object o =
                                server.getAttribute(name,attrs[j].getName());
                            System.out.println("\t\t" + attrs[j].getName() +
                                               " = "+o);
                        } catch (Exception x) {
                            System.err.println("JmxClient failed to get " +
                                               attrs[j].getName());
                            x.printStackTrace(System.err);
                        }
                    }
                }
            } catch (Exception x) {
                System.err.println("JmxClient failed to get MBeanInfo: "  + x);
                x.printStackTrace(System.err);
            }
        }
    }

    /**
     * Trace a debug message.
     */
    private static void debug(String msg) {
        if (debug) System.out.println(msg);
    }

    /**
     * Program Main.
     * <p>
     * Lookup all JMX agents in the SLP Lookup Service and list
     * their MBeans and attributes.
     * <p>
     * You may wish to use the following properties on the Java command line:
     * <ul>
     * <li><code>-Dagent.name=&lt;AgentName&gt;</code>: specifies an
     *     AgentName to lookup (default is null, meaning any agent).</li>
     * <li><code>-Ddebug="true|false"</code>: switch the Client debug flag
     *     on/off (default is "false").</li>
     * </ul>
     */
    public static void main(String[] args) {
        try {
            // Get the value of the debug flag.
            //
            debug = (Boolean.valueOf(System.getProperty("debug","false"))).
                booleanValue();

            // Get AgentName to lookup.
            // If not defined, all agents are taken into account.
            //
            final String agentName = System.getProperty("agent.name");

            // Get a pointer to the SLP Lookup Service.
            //
            final Locator slpLocator = getLocator();
            debug("slpLocator is: " + slpLocator);

            // Lookup all matching agents in the SLP Lookup Service.
            //
            List l = lookup(slpLocator,agentName);

            // Attempt to connect to retrieved agents
            //
            System.out.println("\nNumber of agents found : " + l.size());
            int j = 1;
            for (Iterator i=l.iterator();i.hasNext();j++) {
                JMXConnector c1 = (JMXConnector) i.next();
                if (c1 != null) {

                    // Connect
                    //
                    System.out.println(
                      "\n----------------------------------------------------");
                    System.out.println("\tConnecting to agent number "+j);
                    System.out.println(
                      "----------------------------------------------------");
                    debug("JMXConnector is: " + c1);

                    // Prepare the environment Map
                    //
                    final HashMap env = new HashMap();
                    final String factory =
                        System.getProperty(Context.INITIAL_CONTEXT_FACTORY);
                    final String ldapServerUrl =
                        System.getProperty(Context.PROVIDER_URL);
                    final String ldapUser =
                        System.getProperty(Context.SECURITY_PRINCIPAL);
                    final String ldapPasswd =
                        System.getProperty(Context.SECURITY_CREDENTIALS);

                    // Transfer some system properties to the Map
                    //
                    if (factory!= null) // this should not be needed
                        env.put(Context.INITIAL_CONTEXT_FACTORY,factory);
                    if (ldapServerUrl!=null) // this should not be needed
                        env.put(Context.PROVIDER_URL, ldapServerUrl);
                    if (ldapUser!=null) // this is needed when LDAP is used
                        env.put(Context.SECURITY_PRINCIPAL, ldapUser);
                    if (ldapPasswd != null) // this is needed when LDAP is used
                        env.put(Context.SECURITY_CREDENTIALS, ldapPasswd);

                    try {
                        c1.connect(env);
                    } catch (IOException x) {
                        System.err.println("Connection failed: " + x);
                        x.printStackTrace(System.err);
                        continue;
                    }

                    // Get MBeanServerConnection
                    //
                    MBeanServerConnection conn =
                        c1.getMBeanServerConnection();
                    debug("Connection is:" + conn);
                    System.out.println("Server domain is: " +
                                       conn.getDefaultDomain());

                    // List all MBeans
                    //
                    try {
                        listMBeans(conn);
                    } catch (IOException x) {
                        System.err.println("Failed to list MBeans: " + x);
                        x.printStackTrace(System.err);
                    }

                    // Close connector
                    //
                    try {
                        c1.close();
                    } catch (IOException x) {
                        System.err.println("Failed to close connection: " + x);
                        x.printStackTrace(System.err);
                    }
                }
            }
        } catch (Exception x) {
            System.err.println("Unexpected exception caught in main: " + x);
            x.printStackTrace(System.err);
        }
    }
}