/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.manager.host;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import javax.management.MBeanServer;
import javax.servlet.ServletException;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.Container;
import org.apache.catalina.ContainerServlet;
import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.Globals;
import org.apache.catalina.Host;
import org.apache.catalina.Lifecycle;
import org.apache.catalina.Wrapper;
import org.apache.catalina.core.StandardHost;
import org.apache.catalina.startup.HostConfig;
import org.apache.catalina.util.StringManager;
import org.apache.tomcat.util.modeler.Registry;
import org.apache.catalina.core.ContainerBase;
/**
* Servlet that enables remote management of the virtual hosts installed
* on the server. Normally, this functionality will be protected by
* a security constraint in the web application deployment descriptor.
* However, this requirement can be relaxed during testing.
* <p>
* This servlet examines the value returned by <code>getPathInfo()</code>
* and related query parameters to determine what action is being requested.
* The following actions and parameters (starting after the servlet path)
* are supported:
* <ul>
* <li><b>/add?name={host-name}&aliases={host-aliases}&manager={manager}</b> -
* Create and add a new virtual host. The <code>host-name</code> attribute
* indicates the name of the new host. The <code>host-aliases</code>
* attribute is a comma separated list of the host alias names.
* The <code>manager</code> attribute is a boolean value indicating if the
* webapp manager will be installed in the newly created host (optional,
* false by default).</li>
* <li><b>/remove?name={host-name}</b> - Remove a virtual host.
* The <code>host-name</code> attribute indicates the name of the host.
* </li>
* <li><b>/list</b> - List the virtual hosts installed on the server.
* Each host will be listed with the following format
* <code>host-name#host-aliases</code>.</li>
* <li><b>/start?name={host-name}</b> - Start the virtual host.</li>
* <li><b>/stop?name={host-name}</b> - Stop the virtual host.</li>
* </ul>
* <p>
* <b>NOTE</b> - Attempting to stop or remove the host containing
* this servlet itself will not succeed. Therefore, this servlet should
* generally be deployed in a separate virtual host.
* <p>
* <b>NOTE</b> - For security reasons, this application will not operate
* when accessed via the invoker servlet. You must explicitly map this servlet
* with a servlet mapping, and you will always want to protect it with
* appropriate security constraints as well.
* <p>
* The following servlet initialization parameters are recognized:
* <ul>
* <li><b>debug</b> - The debugging detail level that controls the amount
* of information that is logged by this servlet. Default is zero.
* </ul>
*
* @author Craig R. McClanahan
* @author Remy Maucherat
* @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
*/
public class HostManagerServlet
extends HttpServlet implements ContainerServlet {
// ----------------------------------------------------- Instance Variables
/**
* Path where context descriptors should be deployed.
*/
protected File configBase = null;
/**
* The Context container associated with our web application.
*/
protected Context context = null;
/**
* The debugging detail level for this servlet.
*/
protected int debug = 1;
/**
* The associated host.
*/
protected Host host = null;
/**
* The associated engine.
*/
protected Engine engine = null;
/**
* MBean server.
*/
protected MBeanServer mBeanServer = null;
/**
* The string manager for this package.
*/
protected static StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The Wrapper container associated with this servlet.
*/
protected Wrapper wrapper = null;
// ----------------------------------------------- ContainerServlet Methods
/**
* Return the Wrapper with which we are associated.
*/
public Wrapper getWrapper() {
return (this.wrapper);
}
/**
* Set the Wrapper with which we are associated.
*
* @param wrapper The new wrapper
*/
public void setWrapper(Wrapper wrapper) {
this.wrapper = wrapper;
if (wrapper == null) {
context = null;
host = null;
engine = null;
} else {
context = (Context) wrapper.getParent();
host = (Host) context.getParent();
engine = (Engine) host.getParent();
}
// Retrieve the MBean server
mBeanServer = Registry.getRegistry(null, null).getMBeanServer();
}
// --------------------------------------------------------- Public Methods
/**
* Finalize this servlet.
*/
public void destroy() {
; // No actions necessary
}
/**
* Process a GET request for the specified resource.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet-specified error occurs
*/
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// Verify that we were not accessed using the invoker servlet
if (request.getAttribute(Globals.INVOKED_ATTR) != null)
throw new UnavailableException
(sm.getString("hostManagerServlet.cannotInvoke"));
// Identify the request parameters that we need
String command = request.getPathInfo();
if (command == null)
command = request.getServletPath();
String name = request.getParameter("name");
// Prepare our output writer to generate the response message
response.setContentType("text/plain; charset=" + Constants.CHARSET);
PrintWriter writer = response.getWriter();
// Process the requested command
if (command == null) {
writer.println(sm.getString("hostManagerServlet.noCommand"));
} else if (command.equals("/add")) {
add(request, writer, name, false);
} else if (command.equals("/remove")) {
remove(writer, name);
} else if (command.equals("/list")) {
list(writer);
} else if (command.equals("/start")) {
start(writer, name);
} else if (command.equals("/stop")) {
stop(writer, name);
} else {
writer.println(sm.getString("hostManagerServlet.unknownCommand",
command));
}
// Finish up the response
writer.flush();
writer.close();
}
/**
* Add host with the given parameters.
*
* @param request The request
* @param writer The output writer
* @param name The host name
* @param htmlMode Flag value
*/
protected void add(HttpServletRequest request, PrintWriter writer, String name, boolean htmlMode ) {
String aliases = request.getParameter("aliases");
String appBase = request.getParameter("appBase");
boolean manager = booleanParameter(request, "manager", false, htmlMode);
boolean autoDeploy = booleanParameter(request, "autoDeploy", true, htmlMode);
boolean deployOnStartup = booleanParameter(request, "deployOnStartup", true, htmlMode);
boolean deployXML = booleanParameter(request, "deployXML", true, htmlMode);
boolean unpackWARs = booleanParameter(request, "unpackWARs", true, htmlMode);
boolean xmlNamespaceAware = booleanParameter(request, "xmlNamespaceAware", false, htmlMode);
boolean xmlValidation = booleanParameter(request, "xmlValidation", false, htmlMode);
add(writer, name, aliases, appBase, manager,
autoDeploy,
deployOnStartup,
deployXML,
unpackWARs,
xmlNamespaceAware,
xmlValidation);
}
/**
* extract boolean value from checkbox with default
* @param request
* @param parameter
* @param theDefault
* @param htmlMode
* @return
*/
protected boolean booleanParameter(HttpServletRequest request,
String parameter, boolean theDefault, boolean htmlMode) {
String value = request.getParameter(parameter);
boolean booleanValue = theDefault;
if (value != null) {
if (htmlMode) {
if (value.equals("on")) {
booleanValue = true;
}
} else if (theDefault) {
if (value.equals("false")) {
booleanValue = false;
}
} else if (value.equals("true")) {
booleanValue = true;
}
} else if (htmlMode)
booleanValue = false;
return booleanValue;
}
/**
* Initialize this servlet.
*/
public void init() throws ServletException {
// Ensure that our ContainerServlet properties have been set
if ((wrapper == null) || (context == null))
throw new UnavailableException
(sm.getString("hostManagerServlet.noWrapper"));
// Verify that we were not accessed using the invoker servlet
String servletName = getServletConfig().getServletName();
if (servletName == null)
servletName = "";
if (servletName.startsWith("org.apache.catalina.INVOKER."))
throw new UnavailableException
(sm.getString("hostManagerServlet.cannotInvoke"));
// Set our properties from the initialization parameters
String value = null;
try {
value = getServletConfig().getInitParameter("debug");
debug = Integer.parseInt(value);
} catch (Throwable t) {
;
}
}
// -------------------------------------------------------- Private Methods
/**
* Add a host using the specified parameters.
*
* @param writer Writer to render results to
* @param name host name
* @param aliases comma separated alias list
* @param appBase application base for the host
* @param manager should the manager webapp be deployed to the new host ?
*/
protected synchronized void add
(PrintWriter writer, String name, String aliases, String appBase,
boolean manager,
boolean autoDeploy,
boolean deployOnStartup,
boolean deployXML,
boolean unpackWARs,
boolean xmlNamespaceAware,
boolean xmlValidation) {
if (debug >= 1) {
log("add: Adding host '" + name + "'");
}
// Validate the requested host name
if ((name == null) || name.length() == 0) {
writer.println(sm.getString("hostManagerServlet.invalidHostName", name));
return;
}
// Check if host already exists
if (engine.findChild(name) != null) {
writer.println
(sm.getString("hostManagerServlet.alreadyHost", name));
return;
}
// Validate and create appBase
File appBaseFile = null;
if (appBase == null || appBase.length() == 0) {
appBase = name;
}
File file = new File(appBase);
if (!file.isAbsolute())
file = new File(System.getProperty("catalina.base"), appBase);
try {
appBaseFile = file.getCanonicalFile();
} catch (IOException e) {
appBaseFile = file;
}
if (!appBaseFile.exists()) {
appBaseFile.mkdirs();
}
// Create base for config files
File configBaseFile = getConfigBase(name);
// Copy manager.xml if requested
if (manager) {
InputStream is = null;
OutputStream os = null;
try {
is = getServletContext().getResourceAsStream("/manager.xml");
os = new FileOutputStream(new File(configBaseFile, "manager.xml"));
byte buffer[] = new byte[512];
int len = buffer.length;
while (true) {
len = is.read(buffer);
if (len == -1)
break;
os.write(buffer, 0, len);
}
} catch (IOException e) {
writer.println
(sm.getString("hostManagerServlet.managerXml"));
return;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
if (os != null) {
try {
os.close();
} catch (IOException e) {
}
}
}
}
StandardHost host = new StandardHost();
host.setAppBase(appBase);
host.setName(name);
host.addLifecycleListener(new HostConfig());
// Add host aliases
if ((aliases != null) && !("".equals(aliases))) {
StringTokenizer tok = new StringTokenizer(aliases, ", ");
while (tok.hasMoreTokens()) {
host.addAlias(tok.nextToken());
}
}
host.setAutoDeploy(autoDeploy);
host.setDeployOnStartup(deployOnStartup);
host.setDeployXML(deployXML);
host.setUnpackWARs(unpackWARs);
host.setXmlNamespaceAware(xmlNamespaceAware);
host.setXmlValidation(xmlValidation);
// Add new host
try {
engine.addChild(host);
} catch (Exception e) {
writer.println(sm.getString("hostManagerServlet.exception",
e.toString()));
return;
}
host = (StandardHost) engine.findChild(name);
if (host != null) {
writer.println(sm.getString("hostManagerServlet.add", name));
} else {
// Something failed
writer.println(sm.getString("hostManagerServlet.addFailed", name));
}
}
/**
* Remove the specified host.
*
* @param writer Writer to render results to
* @param name host name
*/
protected synchronized void remove(PrintWriter writer, String name) {
if (debug >= 1) {
log("remove: Removing host '" + name + "'");
}
// Validate the requested host name
if ((name == null) || name.length() == 0) {
writer.println(sm.getString("hostManagerServlet.invalidHostName", name));
return;
}
// Check if host exists
if (engine.findChild(name) == null) {
writer.println
(sm.getString("hostManagerServlet.noHost", name));
return;
}
// Prevent removing our own host
if (engine.findChild(name) == host) {
writer.println
(sm.getString("hostManagerServlet.cannotRemoveOwnHost", name));
return;
}
// Remove host
// Note that the host will not get physically removed
try {
Container child = engine.findChild(name);
engine.removeChild(child);
if ( child instanceof ContainerBase ) ((ContainerBase)child).destroy();
} catch (Exception e) {
writer.println(sm.getString("hostManagerServlet.exception",
e.toString()));
return;
}
Host host = (StandardHost) engine.findChild(name);
if (host == null) {
writer.println(sm.getString("hostManagerServlet.remove", name));
} else {
// Something failed
writer.println(sm.getString("hostManagerServlet.removeFailed", name));
}
}
/**
* Render a list of the currently active Contexts in our virtual host.
*
* @param writer Writer to render to
*/
protected void list(PrintWriter writer) {
if (debug >= 1)
log("list: Listing hosts for engine '"
+ engine.getName() + "'");
writer.println(sm.getString("hostManagerServlet.listed",
engine.getName()));
Container[] hosts = engine.findChildren();
for (int i = 0; i < hosts.length; i++) {
Host host = (Host) hosts[i];
String name = host.getName();
String[] aliases = host.findAliases();
StringBuffer buf = new StringBuffer();
if (aliases.length > 0) {
buf.append(aliases[0]);
for (int j = 1; j < aliases.length; j++) {
buf.append(',').append(aliases[j]);
}
}
writer.println(sm.getString("hostManagerServlet.listitem",
name, buf.toString()));
}
}
/**
* Start the host with the specified name.
*
* @param writer Writer to render to
* @param name Host name
*/
protected void start(PrintWriter writer, String name) {
if (debug >= 1)
log("start: Starting host with name '" + name + "'");
// Validate the requested host name
if ((name == null) || name.length() == 0) {
writer.println(sm.getString("hostManagerServlet.invalidHostName", name));
return;
}
// Check if host exists
if (engine.findChild(name) == null) {
writer.println
(sm.getString("hostManagerServlet.noHost", name));
return;
}
// Prevent starting our own host
if (engine.findChild(name) == host) {
writer.println
(sm.getString("hostManagerServlet.cannotStartOwnHost", name));
return;
}
// Start host
try {
((Lifecycle) engine.findChild(name)).start();
writer.println
(sm.getString("hostManagerServlet.started", name));
} catch (Throwable t) {
getServletContext().log
(sm.getString("hostManagerServlet.startFailed", name), t);
writer.println
(sm.getString("hostManagerServlet.startFailed", name));
writer.println(sm.getString("hostManagerServlet.exception",
t.toString()));
return;
}
}
/**
* Start the host with the specified name.
*
* @param writer Writer to render to
* @param name Host name
*/
protected void stop(PrintWriter writer, String name) {
if (debug >= 1)
log("stop: Stopping host with name '" + name + "'");
// Validate the requested host name
if ((name == null) || name.length() == 0) {
writer.println(sm.getString("hostManagerServlet.invalidHostName", name));
return;
}
// Check if host exists
if (engine.findChild(name) == null) {
writer.println
(sm.getString("hostManagerServlet.noHost", name));
return;
}
// Prevent starting our own host
if (engine.findChild(name) == host) {
writer.println
(sm.getString("hostManagerServlet.cannotStopOwnHost", name));
return;
}
// Start host
try {
((Lifecycle) engine.findChild(name)).stop();
writer.println
(sm.getString("hostManagerServlet.stopped", name));
} catch (Throwable t) {
getServletContext().log
(sm.getString("hostManagerServlet.stopFailed", name), t);
writer.println
(sm.getString("hostManagerServlet.stopFailed", name));
writer.println(sm.getString("hostManagerServlet.exception",
t.toString()));
return;
}
}
// -------------------------------------------------------- Support Methods
/**
* Get config base.
*/
protected File getConfigBase(String hostName) {
File configBase =
new File(System.getProperty("catalina.base"), "conf");
if (!configBase.exists()) {
return null;
}
if (engine != null) {
configBase = new File(configBase, engine.getName());
}
if (host != null) {
configBase = new File(configBase, hostName);
}
configBase.mkdirs();
return configBase;
}
}
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