| /* |
| * Copyright (c) 1996, 2012, 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 { |
| private static final long serialVersionUID = 8147981687059865216L; |
| |
| public CGIClientException(String s) { |
| super(s); |
| } |
| |
| public CGIClientException(String s, Throwable cause) { |
| super(s, cause); |
| } |
| } |
| |
| /** |
| * CGIServerException is thrown when an error occurs here on the server. |
| */ |
| class CGIServerException extends Exception { |
| |
| private static final long serialVersionUID = 6928425456704527017L; |
| |
| public CGIServerException(String s) { |
| super(s); |
| } |
| |
| public CGIServerException(String s, Throwable cause) { |
| super(s, cause); |
| } |
| } |
| |
| /** |
| * 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<Void>() { |
| public Void 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<String, CGICommandHandler> 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 = |
| commandLookup.get(command); |
| if (handler != null) |
| try { |
| handler.execute(param); |
| } catch (CGIClientException e) { |
| e.printStackTrace(); |
| returnClientError(e.getMessage()); |
| } catch (CGIServerException e) { |
| e.printStackTrace(); |
| returnServerError(e.getMessage()); |
| } |
| else |
| returnClientError("invalid command."); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| 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 response back to client. |
| */ |
| final class CGIForwardCommand implements CGICommandHandler { |
| |
| public String getName() { |
| return "forward"; |
| } |
| |
| @SuppressWarnings("deprecation") |
| private String getLine (DataInputStream socketIn) throws IOException { |
| return socketIn.readLine(); |
| } |
| |
| 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.", e); |
| } |
| 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", e); |
| } |
| |
| /* |
| * 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", e); |
| } catch (IOException e) { |
| throw new CGIClientException("error reading request body", e); |
| } |
| |
| /* |
| * 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", e); |
| } |
| |
| /* |
| * read response |
| */ |
| DataInputStream socketIn; |
| try { |
| socketIn = new DataInputStream(socket.getInputStream()); |
| } catch (IOException e) { |
| throw new CGIServerException("error reading from server", e); |
| } |
| String key = "Content-length:".toLowerCase(); |
| boolean contentLengthFound = false; |
| String line; |
| int responseContentLength = -1; |
| do { |
| try { |
| line = getLine(socketIn); |
| } catch (IOException e) { |
| throw new CGIServerException("error reading from server", e); |
| } |
| if (line == null) |
| throw new CGIServerException( |
| "unexpected EOF reading server response"); |
| |
| if (line.toLowerCase().startsWith(key)) { |
| if (contentLengthFound) { |
| throw new CGIServerException( |
| "Multiple Content-length entries found."); |
| } else { |
| 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", e); |
| } catch (IOException e) { |
| throw new CGIServerException("error reading from server", e); |
| } |
| |
| /* |
| * 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", e); |
| } |
| 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>"); |
| } |
| } |