/*
* Copyright (c) 1996, 1998, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.rmi.transport.proxy;
import java.io.*;
import java.net.*;
import java.util.Hashtable;
/**
* CGIClientException is thrown when an error is detected
* in a client's request.
*/
class CGIClientException extends Exception {
public CGIClientException(String s) {
super(s);
}
}
/**
* CGIServerException is thrown when an error occurs here on the server.
*/
class CGIServerException extends Exception {
public CGIServerException(String s) {
super(s);
}
}
/**
* CGICommandHandler is the interface to an object that handles a
* particular supported command.
*/
interface CGICommandHandler {
/**
* 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(String param) throws CGIClientException, CGIServerException;
}
/**
* The CGIHandler class contains methods for executing as a CGI program.
* The main function interprets the query string as a command of the form
* "<command>=<parameters>".
*
* This class depends on the CGI 1.0 environment variables being set as
* properties of the same name in this Java VM.
*
* All data and methods of this class are static because they are specific
* to this particular CGI process.
*/
public final class CGIHandler {
/* get CGI parameters that we need */
static int ContentLength;
static String QueryString;
static String RequestMethod;
static String ServerName;
static int ServerPort;
static {
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public Object run() {
ContentLength =
Integer.getInteger("CONTENT_LENGTH", 0).intValue();
QueryString = System.getProperty("QUERY_STRING", "");
RequestMethod = System.getProperty("REQUEST_METHOD", "");
ServerName = System.getProperty("SERVER_NAME", "");
ServerPort = Integer.getInteger("SERVER_PORT", 0).intValue();
return null;
}
});
}
/* list of handlers for supported commands */
private static CGICommandHandler commands[] = {
new CGIForwardCommand(),
new CGIGethostnameCommand(),
new CGIPingCommand(),
new CGITryHostnameCommand()
};
/* 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]);
}
/* prevent instantiation of this class */
private CGIHandler() {}
/**
* Execute command given in query string on URL. The string before
* the first '=' is interpreted as the command name, and the string
* after the first '=' is the parameters to the command.
*/
public static void main(String args[])
{
try {
String command, param;
int delim = QueryString.indexOf("=");
if (delim == -1) {
command = QueryString;
param = "";
}
else {
command = QueryString.substring(0, delim);
param = QueryString.substring(delim + 1);
}
CGICommandHandler handler =
(CGICommandHandler) commandLookup.get(command);
if (handler != null)
try {
handler.execute(param);
} catch (CGIClientException e) {
returnClientError(e.getMessage());
} catch (CGIServerException e) {
returnServerError(e.getMessage());
}
else
returnClientError("invalid command: " + command);
} catch (Exception e) {
returnServerError("internal error: " + e.getMessage());
}
System.exit(0);
}
/**
* Return an HTML error message indicating there was error in
* the client's request.
*/
private static void returnClientError(String message)
{
System.out.println("Status: 400 Bad Request: " + message);
System.out.println("Content-type: text/html");
System.out.println("");
System.out.println("<HTML>" +
"<HEAD><TITLE>Java RMI Client Error" +
"</TITLE></HEAD>" +
"<BODY>");
System.out.println("<H1>Java RMI Client Error</H1>");
System.out.println("");
System.out.println(message);
System.out.println("</BODY></HTML>");
System.exit(1);
}
/**
* Return an HTML error message indicating an error occurred
* here on the server.
*/
private static void returnServerError(String message)
{
System.out.println("Status: 500 Server Error: " + message);
System.out.println("Content-type: text/html");
System.out.println("");
System.out.println("<HTML>" +
"<HEAD><TITLE>Java RMI Server Error" +
"</TITLE></HEAD>" +
"<BODY>");
System.out.println("<H1>Java RMI Server Error</H1>");
System.out.println("");
System.out.println(message);
System.out.println("</BODY></HTML>");
System.exit(1);
}
}
/**
* "forward" command: Forward request body to local port on the server,
* and send reponse back to client.
*/
final class CGIForwardCommand implements CGICommandHandler {
public String getName() {
return "forward";
}
public void execute(String param) throws CGIClientException, CGIServerException
{
if (!CGIHandler.RequestMethod.equals("POST"))
throw new CGIClientException("can only forward POST requests");
int port;
try {
port = Integer.parseInt(param);
} catch (NumberFormatException e) {
throw new CGIClientException("invalid port number: " + param);
}
if (port <= 0 || port > 0xFFFF)
throw new CGIClientException("invalid port: " + port);
if (port < 1024)
throw new CGIClientException("permission denied for port: " +
port);
byte buffer[];
Socket socket;
try {
socket = new Socket(InetAddress.getLocalHost(), port);
} catch (IOException e) {
throw new CGIServerException("could not connect to local port");
}
/*
* read client's request body
*/
DataInputStream clientIn = new DataInputStream(System.in);
buffer = new byte[CGIHandler.ContentLength];
try {
clientIn.readFully(buffer);
} catch (EOFException e) {
throw new CGIClientException("unexpected EOF reading request body");
} catch (IOException e) {
throw new CGIClientException("error reading request body");
}
/*
* send to local server in HTTP
*/
try {
DataOutputStream socketOut =
new DataOutputStream(socket.getOutputStream());
socketOut.writeBytes("POST / HTTP/1.0\r\n");
socketOut.writeBytes("Content-length: " +
CGIHandler.ContentLength + "\r\n\r\n");
socketOut.write(buffer);
socketOut.flush();
} catch (IOException e) {
throw new CGIServerException("error writing to server");
}
/*
* read response
*/
DataInputStream socketIn;
try {
socketIn = new DataInputStream(socket.getInputStream());
} catch (IOException e) {
throw new CGIServerException("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 CGIServerException("error reading from server");
}
if (line == null)
throw new CGIServerException(
"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) != '\r') && (line.charAt(0) != '\n'));
if (!contentLengthFound || responseContentLength < 0)
throw new CGIServerException(
"missing or invalid content length in server response");
buffer = new byte[responseContentLength];
try {
socketIn.readFully(buffer);
} catch (EOFException e) {
throw new CGIServerException(
"unexpected EOF reading server response");
} catch (IOException e) {
throw new CGIServerException("error reading from server");
}
/*
* send response back to client
*/
System.out.println("Status: 200 OK");
System.out.println("Content-type: application/octet-stream");
System.out.println("");
try {
System.out.write(buffer);
} catch (IOException e) {
throw new CGIServerException("error writing response");
}
System.out.flush();
}
}
/**
* "gethostname" command: Return the host name of the server as the
* response body
*/
final class CGIGethostnameCommand implements CGICommandHandler {
public String getName() {
return "gethostname";
}
public void execute(String param)
{
System.out.println("Status: 200 OK");
System.out.println("Content-type: application/octet-stream");
System.out.println("Content-length: " +
CGIHandler.ServerName.length());
System.out.println("");
System.out.print(CGIHandler.ServerName);
System.out.flush();
}
}
/**
* "ping" command: Return an OK status to indicate that connection
* was successful.
*/
final class CGIPingCommand implements CGICommandHandler {
public String getName() {
return "ping";
}
public void execute(String param)
{
System.out.println("Status: 200 OK");
System.out.println("Content-type: application/octet-stream");
System.out.println("Content-length: 0");
System.out.println("");
}
}
/**
* "tryhostname" command: Return a human readable message describing
* what host name is available to local Java VMs.
*/
final class CGITryHostnameCommand implements CGICommandHandler {
public String getName() {
return "tryhostname";
}
public void execute(String param)
{
System.out.println("Status: 200 OK");
System.out.println("Content-type: text/html");
System.out.println("");
System.out.println("<HTML>" +
"<HEAD><TITLE>Java RMI Server Hostname Info" +
"</TITLE></HEAD>" +
"<BODY>");
System.out.println("<H1>Java RMI Server Hostname Info</H1>");
System.out.println("<H2>Local host name available to Java VM:</H2>");
System.out.print("<P>InetAddress.getLocalHost().getHostName()");
try {
String localHostName = InetAddress.getLocalHost().getHostName();
System.out.println(" = " + localHostName);
} catch (UnknownHostException e) {
System.out.println(" threw java.net.UnknownHostException");
}
System.out.println("<H2>Server host information obtained through CGI interface from HTTP server:</H2>");
System.out.println("<P>SERVER_NAME = " + CGIHandler.ServerName);
System.out.println("<P>SERVER_PORT = " + CGIHandler.ServerPort);
System.out.println("</BODY></HTML>");
}
}