/* * Copyright (c) 1996, 2005, 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.BufferedInputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;import sun.rmi.runtime.Log; /** * The HttpAwareServerSocket class extends the java.net.ServerSocket * class.  It behaves like a ServerSocket, except that if * the first four bytes of an accepted socket are the letters "POST", * then it returns an HttpReceiveSocket instead of a java.net.Socket. * This means that the accept method blocks until four bytes have been * read from the new socket's input stream. */class HttpAwareServerSocket extends ServerSocket {     /**     * Create a server socket on a specified port.     * @param port the port     * @exception IOException IO error when opening the socket.     */    public HttpAwareServerSocket(int port) throws IOException    {        super(port);    }     /**     * Create a server socket, bind it to the specified local port     * and listen to it.  You can connect to an annonymous port by     * specifying the port number to be 0.  <i>backlog</i> specifies     * how many connection requests the system will queue up while waiting     * for the ServerSocket to execute accept().     * @param port the specified port     * @param backlog the number of queued connect requests pending accept     */    public HttpAwareServerSocket(int port, int backlog) throws IOException    {        super(port, backlog);    }     /**     * Accept a connection. This method will block until the connection     * is made and four bytes can be read from the input stream.     * If the first four bytes are "POST", then an HttpReceiveSocket is     * returned, which will handle the HTTP protocol wrapping.     * Otherwise, a WrappedSocket is returned.  The input stream will be     * reset to the beginning of the transmission.     * In either case, a BufferedInputStream will already be on top of     * the underlying socket's input stream.     * @exception IOException IO error when waiting for the connection.     */    public Socket accept() throws IOException    {        Socket socket = super.accept();        BufferedInputStream in =            new BufferedInputStream(socket.getInputStream());         RMIMasterSocketFactory.proxyLog.log(Log.BRIEF,            "socket accepted (checking for POST)");         in.mark(4);        boolean isHttp = (in.read() == 'P') &&                         (in.read() == 'O') &&                         (in.read() == 'S') &&                         (in.read() == 'T');        in.reset();         if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.BRIEF)) {            RMIMasterSocketFactory.proxyLog.log(Log.BRIEF,                (isHttp ? "POST found, HTTP socket returned" :                          "POST not found, direct socket returned"));        }         if (isHttp)            return new HttpReceiveSocket(socket, in, null);        else            return new WrappedSocket(socket, in, null);    }     /**     * Return the implementation address and implementation port of     * the HttpAwareServerSocket as a String.     */    public String toString()    {        return "HttpAware" + super.toString();    }}