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/*
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* Copyright (c) 1996, 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.rmi.transport.proxy;
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import java.io.BufferedInputStream;
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import java.io.IOException;
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import java.net.ServerSocket;
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import java.net.Socket;
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import sun.rmi.runtime.Log;
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/**
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* The HttpAwareServerSocket class extends the java.net.ServerSocket
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* class. It behaves like a ServerSocket, except that if
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* the first four bytes of an accepted socket are the letters "POST",
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* then it returns an HttpReceiveSocket instead of a java.net.Socket.
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* This means that the accept method blocks until four bytes have been
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* read from the new socket's input stream.
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*/
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class HttpAwareServerSocket extends ServerSocket {
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/**
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* Create a server socket on a specified port.
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* @param port the port
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* @exception IOException IO error when opening the socket.
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*/
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public HttpAwareServerSocket(int port) throws IOException
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{
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super(port);
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}
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/**
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* Create a server socket, bind it to the specified local port
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* and listen to it. You can connect to an annonymous port by
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* specifying the port number to be 0. <i>backlog</i> specifies
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* how many connection requests the system will queue up while waiting
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* for the ServerSocket to execute accept().
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* @param port the specified port
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* @param backlog the number of queued connect requests pending accept
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*/
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public HttpAwareServerSocket(int port, int backlog) throws IOException
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{
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super(port, backlog);
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}
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/**
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* Accept a connection. This method will block until the connection
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* is made and four bytes can be read from the input stream.
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* If the first four bytes are "POST", then an HttpReceiveSocket is
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* returned, which will handle the HTTP protocol wrapping.
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* Otherwise, a WrappedSocket is returned. The input stream will be
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* reset to the beginning of the transmission.
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* In either case, a BufferedInputStream will already be on top of
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* the underlying socket's input stream.
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* @exception IOException IO error when waiting for the connection.
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*/
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public Socket accept() throws IOException
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{
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Socket socket = super.accept();
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BufferedInputStream in =
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new BufferedInputStream(socket.getInputStream());
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RMIMasterSocketFactory.proxyLog.log(Log.BRIEF,
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"socket accepted (checking for POST)");
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in.mark(4);
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boolean isHttp = (in.read() == 'P') &&
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(in.read() == 'O') &&
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(in.read() == 'S') &&
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(in.read() == 'T');
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in.reset();
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if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.BRIEF)) {
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RMIMasterSocketFactory.proxyLog.log(Log.BRIEF,
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(isHttp ? "POST found, HTTP socket returned" :
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"POST not found, direct socket returned"));
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}
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if (isHttp)
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return new HttpReceiveSocket(socket, in, null);
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else
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return new WrappedSocket(socket, in, null);
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}
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/**
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* Return the implementation address and implementation port of
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* the HttpAwareServerSocket as a String.
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*/
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public String toString()
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{
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return "HttpAware" + super.toString();
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}
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}
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