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HomeBackend DevelopmentC#.Net TutorialImplementing RMI to break through firewall based on Servlet

package com.mypack.web.rmi;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.net.UnknownHostException;
import java.rmi.Naming;
import java.rmi.RMISecurityManager;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.server.RMIClassLoader;
import java.rmi.server.UnicastRemoteObject;
import java.util.Hashtable;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * The default RMI socket factory contains several "fallback" mechanisms which
 * enable an RMI client to communicate with a remote server. When an RMI client
 * initiates contact with a remote server, it attempts to establish a connection
 * using each of the following protocols in turn, until one succeeds:
 * 
 * 1. Direct TCP connection. 2. Direct HTTP connection. 3. Proxy connection
 * (SOCKS or HTTP). 4. Connection on port 80 over HTTP to a CGI script. 5. Proxy
 * HTTP connection to CGI script on port 80.
 * 
 * The RMI ServletHandler can be used as replacement for the java-rmi.cgi script
 * that comes with the Java Development Kit (and is invoked in protocols 4 and 5
 * above). The java-rmi.cgi script and the ServletHandler both function as proxy
 * applications that forward remote calls embedded in HTTP to local RMI servers
 * which service these calls. The RMI ServletHandler enables RMI to tunnel
 * remote method calls over HTTP more efficiently than the existing java-rmi.cgi
 * script. The ServletHandler is only loaded once from the servlet
 * administration utility. The script, java-rmi.cgi, is executed once every
 * remote call.
 * 
 * The ServletHandler class contains methods for executing as a Java servlet
 * extension. Because the RMI protocol only makes use of the HTTP post command,
 * the ServletHandler only supports the <code>doPost</code>
 * <code>HttpServlet</code> method. The <code>doPost</code> method of this class
 * interprets a servlet request&#39;s query string as a command of the form
 * "<command>=<parameters>". These commands are represented by the abstract
 * interface, <code>RMICommandHandler</code>. Once the <code>doPost</code>
 * method has parsed the requested command, it calls the execute method on one
 * of several command handlers in the <code>commands</code> array.
 * 
 * The command that actually proxies remote calls is the
 * <code>ServletForwardCommand</code>. When the execute method is invoked on the
 * ServletForwardCommand, the command will open a connection on a local port
 * specified by its <code>param</code> parameter and will proceed to write the
 * body of the relevant post request into this connection. It is assumed that an
 * RMI server (e.g. SampleRMIServer) is listening on the local port, "param."
 * The "forward" command will then read the RMI server&#39;s response and send this
 * information back to the RMI client as the body of the response to the HTTP
 * post method.
 * 
 * Because the ServletHandler uses a local socket to proxy remote calls, the
 * servlet has the ability to forward remote calls to local RMI objects that
 * reside in the ServletVM or outside of it.
 * 
 * Servlet documentation may be found at the following location:
 * 
 * http://jserv.javasoft.com/products/java-server/documentation/
 * webserver1.0.2/apidoc/Package-javax.servlet.http.html
 */
public class ServletHandler extends HttpServlet implements Runnable {
/* Variables to hold optional configuration properties. */
/**
* serialVersionUID
*/
private static final long serialVersionUID = 1L;
/** codebase from which this servlet will load remote objects. */
protected static String initialServerCodebase = null;
/** name of RMI server class to be created in init method */
protected static String initialServerClass = null;
/** name of RMI server class to be created in init method */
protected static String initialServerBindName = null;
/**
* RMICommandHandler is the abstraction for an object that handles a
* particular supported command (for example the "forward" command
* "forwards" call information to a remote server on the local machine).
* 
* The command handler is only used by the ServletHandler so the interface
* is protected.
*/
protected interface RMICommandHandler {
/**
* Return the string form of the command to be recognized in the query
* string.
*/
public String getName();
/**
* Execute the command with the given string as parameter.
*/
public void execute(HttpServletRequest req, HttpServletResponse res,
String param) throws ServletClientException,
ServletServerException, IOException;
}
/**
* List of handlers for supported commands. A new command will be created
* for every service request
*/
private static RMICommandHandler commands[] = new RMICommandHandler[] {
new ServletForwardCommand(), new ServletGethostnameCommand(),
new ServletPingCommand(), new ServletTryHostnameCommand() };
/* construct table mapping command strings to handlers */
private static Hashtable commandLookup;
static {
commandLookup = new Hashtable();
for (int i = 0; i < commands.length; ++i)
commandLookup.put(commands[i].getName(), commands[i]);
}
/**
* Once loaded, Java Servlets continue to run until they are unloaded or the
* webserver is stopped. This example takes advantage of the extended
* Servlet life-cycle and runs a remote object in the Servlet VM.
* 
* To initialize this remote object the Servlet Administrator should specify
* a set of parameters which will be used to download and install an initial
* remote server (see readme.txt).
* 
* If configuration parameters are valid (not blank), the servlet will
* attempt to load and start a remote object and a registry in which the
* object may be bound.
* 
* @param config
*            Standard configuration object for an http servlet.
* 
* @exception ServletException
*                Calling <code>super.init(config)</code> may cause a
*                servlet exception to be thrown.
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
try {
setConfigParameters(config);
if (!verifyConfigParameters()) {
// dont export any objects.
System.err.println("Some optional parameters not set, "
+ "remote object not exported; "
+ "ServletHandler is runnning.");
return;
}
/*
* RMI requires that a local security manager be responsible for the
* method invocations from remote clients - we need to make sure a
* security manager is installed.
*/
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
}
// create a registry if one is not running already.
try {
LocateRegistry.createRegistry(1099);
} catch (java.rmi.server.ExportException ee) {
// registry already exists, we&#39;ll just use it.
} catch (RemoteException re) {
System.err.println(re.getMessage());
re.printStackTrace();
}
/**
* Download and create a server object in a thread so we do not
* interfere with other servlets. Allow init method to return more
* quickly.
*/
(new Thread(this)).start();
System.out.println("RMI Servlet Handler loaded sucessfully.");
} catch (Exception e) {
System.err.println("Exception thrown in RMI ServletHandler: "
+ e.getMessage());
e.printStackTrace();
}
}
/**
* Create the sample RMI server.
*/
public void run() {
try {
UnicastRemoteObject server = createRemoteObjectUsingDownloadedClass();
if (server != null) {
Naming.rebind(initialServerBindName, server);
System.err.println("Remote object created successfully.");
}
} catch (Exception e) {
System.err.println("Exception received while intalling object:");
System.err.println(e.getMessage());
e.printStackTrace();
}
}
/**
* Load and export an initial remote object. The implementation class for
* this remote object should not be loaded from the servlet&#39;s class path;
* instead it should be loaded from a URL location that will be accessible
* from a remote client. In the case of this example, that location will be
* <code>initialServerCodebase</code>
*/
UnicastRemoteObject createRemoteObjectUsingDownloadedClass()
throws Exception {
UnicastRemoteObject server = null;
Class serverClass = null;
int MAX_RETRY = 5;
int retry = 0;
int sleep = 2000;
while ((retry < MAX_RETRY) && (serverClass == null)) {
try {
System.err.println("Attempting to load remote class...");
serverClass = RMIClassLoader.loadClass(new URL(
initialServerCodebase), initialServerClass);
// Before we instantiate the obj. make sure it
// is a UnicastRemoteObject.
if (!Class.forName("java.rmi.server.UnicastRemoteObject")
.isAssignableFrom(serverClass)) {
System.err.println("This example requires an "
+ " instance of UnicastRemoteObject,"
+ " remote object not exported.");
} else {
System.out.println("Server class loaded successfully...");
server = ((UnicastRemoteObject) serverClass.newInstance());
}
} catch (java.lang.ClassNotFoundException cnfe) {
retry++;
/**
* The class for the remote object could not be loaded, perhaps
* the webserver has not finished initializing itself yet. Try
* to load the class a few more times...
*/
if (retry >= MAX_RETRY) {
System.err.println("Failed to load remote server "
+ " class. Remote object not " + " exported... ");
} else {
System.err.println("Could not load remote class, "
+ "trying again...");
try {
Thread.sleep(sleep);
} catch (InterruptedException ie) {
}
continue;
}
}
}
return server;
}
/*
* NOTE: If you are using JDK1.2Beta4 or later, it is recommended that you
* provide your servlet with a destroy method that will unexport any remote
* objects that your servlet ever exports. As mentioned in the readme file
* for this example, it is not possible to unexport remote objects in
* JDK1.1.x; there is no method in the RMI 1.1 public API that will perform
* this task. To restart remote objects in the servlet VM, you will have to
* restart your webserver. In JDK1.2x, the methods to unexport a remote
* object are as follows:
* 
* java.rmi.activation.Activatable. unexportObject(Remote obj, boolean
* force) java.rmi.server.UnicastRemoteObject. unexportObject(Remote obj,
* boolean force)
*/
/**
* Execute the command given in the servlet request query string. The string
* before the first &#39;=&#39; in the queryString is interpreted as the command
* name, and the string after the first &#39;=&#39; is the parameters to the
* command.
* 
* @param req
*            HTTP servlet request, contains incoming command and arguments
* @param res
*            HTTP servlet response
* @exception ServletException
*                and IOException when invoking methods of
*                <code>req<code> or <code>res<code>.
*/
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
try {
// Command and parameter for this POST request.
String queryString = req.getQueryString();
String command, param;
int delim = queryString.indexOf("=");
if (delim == -1) {
command = queryString;
param = "";
} else {
command = queryString.substring(0, delim);
param = queryString.substring(delim + 1);
}
System.out.println("command: " + command);
System.out.println("param: " + param);
// lookup command to execute on the client&#39;s behalf
RMICommandHandler handler = (RMICommandHandler) commandLookup
.get(command);
// execute the command
if (handler != null)
try {
handler.execute(req, res, param);
} catch (ServletClientException e) {
returnClientError(res, "client error: " + e.getMessage());
e.printStackTrace();
} catch (ServletServerException e) {
returnServerError(res, "internal server error: "
+ e.getMessage());
e.printStackTrace();
}
else
returnClientError(res, "invalid command: " + command);
} catch (Exception e) {
returnServerError(res, "internal error: " + e.getMessage());
e.printStackTrace();
}
}
/**
* Provide more intelligible errors for methods that are likely to be
* called. Let unsupported HTTP "do*" methods result in an error generated
* by the super class.
* 
* @param req
*            http Servlet request, contains incoming command and arguments
* 
* @param res
*            http Servlet response
* 
* @exception ServletException
*                and IOException when invoking methods of
*                <code>req<code> or <code>res<code>.
*/
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
returnClientError(res, "GET Operation not supported: "
+ "Can only forward POST requests.");
}
public void doPut(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
returnClientError(res, "PUT Operation not supported: "
+ "Can only forward POST requests.");
}
public String getServletInfo() {
return "RMI Call Forwarding Servlet Servlet.<br>\n";
}
/**
* Return an HTML error message indicating there was error in the client&#39;s
* request.
* 
* @param res
*            Servlet response object through which <code>message</code>
*            will be written to the client which invoked one of this
*            servlet&#39;s methods.
* @param message
*            Error message to be written to client.
*/
private static void returnClientError(HttpServletResponse res,
String message) throws IOException {
res
.sendError(HttpServletResponse.SC_BAD_REQUEST, "<HTML><HEAD>"
+ "<TITLE>Java RMI Client Error</TITLE>" + "</HEAD>"
+ "<BODY>" + "<h1 id="Java-nbsp-RMI-nbsp-Client-nbsp-Error">Java RMI Client Error</h1>" + message
+ "</BODY></HTML>");
System.err.println(HttpServletResponse.SC_BAD_REQUEST
+ "Java RMI Client Error" + message);
}
/**
* Return an HTML error message indicating an internal error occurred here
* on the server.
* 
* @param res
*            Servlet response object through which <code>message</code>
*            will be written to the servlet client.
* @param message
*            Error message to be written to servlet client.
*/
private static void returnServerError(HttpServletResponse res,
String message) throws IOException {
res.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
"<HTML><HEAD>" + "<TITLE>Java RMI Server Error</TITLE>"
+ "</HEAD>" + "<BODY>"
+ "<h1 id="Java-nbsp-RMI-nbsp-Server-nbsp-Error">Java RMI Server Error</h1>" + message
+ "</BODY></HTML>");
System.err.println(HttpServletResponse.SC_INTERNAL_SERVER_ERROR
+ "Java RMI Server Error: " + message);
}
/**
* Retrieve parameters from servlet configuration object.
* 
* @param config
*            Standard configuration object for an HTTP servlet.
*/
protected synchronized void setConfigParameters(ServletConfig config) {
try {
initialServerCodebase = config
.getInitParameter("rmiservlethandler.initialServerCodebase");
initialServerClass = config
.getInitParameter("rmiservlethandler.initialServerClass");
initialServerBindName = config
.getInitParameter("rmiservlethandler.initialServerBindName");
} catch (Exception e) {
System.err.println("");
System.err.println("Could not access init parameter:");
System.err.println(e.getMessage());
e.printStackTrace();
}
}
/**
* Ensure that servlet configuration parameters are valid.
* 
* @return <code>true</code> if all relevant configuration parameters are
*         valid (i.e. not "") <code>false</code> otherwise.
*/
protected synchronized boolean verifyConfigParameters() {
return ((verifyParameter("rmiservlethandler.initialServerClass ",
initialServerClass))
&& (verifyParameter("rmiservlethandler.initialServerBindName ",
initialServerBindName)) && (verifyParameter(
"rmiservlethandler.initialServerCodebase",
initialServerCodebase)));
}
/**
* Verify that a single parameter is valid.
* 
* @return <code>true</code> if the parameter is valid.
*/
protected boolean verifyParameter(String parameterName, String parameter) {
if ((parameter == null) || (parameter.equals(""))) {
System.err.println("optional parameter is invalid and "
+ "will not be used: \n    " + parameterName + " = "
+ parameter);
return false;
} else {
System.err.println(parameterName + " " + "valid: " + parameter);
}
return true;
}
/*
* The ServletHandler class is the only object that needs to access the
* CommandHandler subclasses, so we write the commands internal to the
* servlet handler.
*/
/**
* Class that has an execute command to forward request body to local port
* on the server and send server reponse back to client.
*/
protected static class ServletForwardCommand implements RMICommandHandler {
public String getName() {
return "forward";
}
/**
* Execute the forward command. Forwards data from incoming servlet
* request to a port on the local machine. Presumably, an RMI server
* will be reading the data that this method sends.
* 
* @param req
*            The servlet request.
* @param res
*            The servlet response.
* @param param
*            Port to which data will be sent.
*/
public void execute(HttpServletRequest req, HttpServletResponse res,
String param) throws ServletClientException,
ServletServerException, IOException {
int port;
try {
port = Integer.parseInt(param);
} catch (NumberFormatException e) {
throw new ServletClientException("invalid port number: "
+ param);
}
if (port <= 0 || port > 0xFFFF)
throw new ServletClientException("invalid port: " + port);
if (port < 1024)
throw new ServletClientException("permission denied for port: "
+ port);
byte buffer[];
Socket socket;
try {
socket = new Socket(InetAddress.getLocalHost(), port);
} catch (IOException e) {
throw new ServletServerException("could not connect to "
+ "local port");
}
// read client&#39;s request body
DataInputStream clientIn = new DataInputStream(req.getInputStream());
buffer = new byte[req.getContentLength()];
try {
clientIn.readFully(buffer);
} catch (EOFException e) {
throw new ServletClientException("unexpected EOF "
+ "reading request body");
} catch (IOException e) {
throw new ServletClientException("error reading request"
+ " body");
}
DataOutputStream socketOut = null;
// send to local server in HTTP
try {
socketOut = new DataOutputStream(socket.getOutputStream());
socketOut.writeBytes("POST / HTTP/1.0\r\n");
socketOut.writeBytes("Content-length: "
+ req.getContentLength() + "\r\n\r\n");
socketOut.write(buffer);
socketOut.flush();
} catch (IOException e) {
throw new ServletServerException("error writing to server");
}
// read response from local server
DataInputStream socketIn;
try {
socketIn = new DataInputStream(socket.getInputStream());
} catch (IOException e) {
throw new ServletServerException("error reading from "
+ "server");
}
String key = "Content-length:".toLowerCase();
boolean contentLengthFound = false;
String line;
int responseContentLength = -1;
do {
try {
line = socketIn.readLine();
} catch (IOException e) {
throw new ServletServerException(
"error reading from server");
}
if (line == null)
throw new ServletServerException(
"unexpected EOF reading server response");
if (line.toLowerCase().startsWith(key)) {
if (contentLengthFound)
; // what would we want to do in this case??
responseContentLength = Integer.parseInt(line.substring(
key.length()).trim());
contentLengthFound = true;
}
} while ((line.length() != 0) && (line.charAt(0) != &#39;\r&#39;)
&& (line.charAt(0) != &#39;\n&#39;));
if (!contentLengthFound || responseContentLength < 0)
throw new ServletServerException(
"missing or invalid content length in server response");
buffer = new byte[responseContentLength];
try {
socketIn.readFully(buffer);
} catch (EOFException e) {
throw new ServletServerException(
"unexpected EOF reading server response");
} catch (IOException e) {
throw new ServletServerException("error reading from server");
}
// send local server response back to servlet client
res.setStatus(HttpServletResponse.SC_OK);
res.setContentType("application/octet-stream");
res.setContentLength(buffer.length);
try {
OutputStream out = res.getOutputStream();
out.write(buffer);
out.flush();
} catch (IOException e) {
throw new ServletServerException("error writing response");
} finally {
socketOut.close();
socketIn.close();
}
}
}
/**
* Class that has an execute method to return the host name of the server as
* the response body.
*/
protected static class ServletGethostnameCommand implements
RMICommandHandler {
public String getName() {
return "gethostname";
}
public void execute(HttpServletRequest req, HttpServletResponse res,
String param) throws ServletClientException,
ServletServerException, IOException {
byte[] getHostStringBytes = req.getServerName().getBytes();
res.setStatus(HttpServletResponse.SC_OK);
res.setContentType("application/octet-stream");
res.setContentLength(getHostStringBytes.length);
OutputStream out = res.getOutputStream();
out.write(getHostStringBytes);
out.flush();
}
}
/**
* Class that has an execute method to return an OK status to indicate that
* connection was successful.
*/
protected static class ServletPingCommand implements RMICommandHandler {
public String getName() {
return "ping";
}
public void execute(HttpServletRequest req, HttpServletResponse res,
String param) throws ServletClientException,
ServletServerException, IOException {
res.setStatus(HttpServletResponse.SC_OK);
res.setContentType("application/octet-stream");
res.setContentLength(0);
}
}
/**
* Class that has an execute method to return a human readable message
* describing which host name is available to local Java VMs.
*/
protected static class ServletTryHostnameCommand implements
RMICommandHandler {
public String getName() {
return "hostname";
}
public void execute(HttpServletRequest req, HttpServletResponse res,
String param) throws ServletClientException,
ServletServerException, IOException {
PrintWriter pw = res.getWriter();
pw.println("");
pw.println("<HTML>" + "<HEAD><TITLE>Java RMI Server Hostname Info"
+ "</TITLE></HEAD>" + "<BODY>");
pw.println("<h1 id="Java-nbsp-RMI-nbsp-Server-nbsp-Hostname-nbsp-Info">Java RMI Server Hostname Info</h1>");
pw.println("<h2 id="Local-nbsp-host-nbsp-name-nbsp-available-nbsp-to-nbsp-Java-nbsp-VM">Local host name available to Java VM:</h2>");
pw.print("<P>InetAddress.getLocalHost().getHostName()");
try {
String localHostName = InetAddress.getLocalHost().getHostName();
pw.println(" = " + localHostName);
} catch (UnknownHostException e) {
pw.println(" threw java.net.UnknownHostException");
}
pw.println("<H2>Server host information obtained through Servlet "
+ "interface from HTTP server:</H2>");
pw.println("<P>SERVER_NAME = " + req.getServerName());
pw.println("<P>SERVER_PORT = " + req.getServerPort());
pw.println("</BODY></HTML>");
}
}
/**
* ServletClientException is thrown when an error is detected in a client&#39;s
* request.
*/
protected static class ServletClientException extends Exception {
public ServletClientException(String s) {
super(s);
}
}
/**
* ServletServerException is thrown when an error occurs here on the server.
*/
protected static class ServletServerException extends Exception {
public ServletServerException(String s) {
super(s);
}
}
}

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Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function