631 lines
17 KiB
Java
631 lines
17 KiB
Java
/* ServerSocket.java -- Class for implementing server side sockets
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Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004, 2006
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.net;
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import gnu.java.net.PlainSocketImpl;
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import java.io.IOException;
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import java.nio.channels.IllegalBlockingModeException;
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import java.nio.channels.ServerSocketChannel;
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/* Written using on-line Java Platform 1.2 API Specification.
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* Status: I believe all methods are implemented.
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*/
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/**
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* This class models server side sockets. The basic model is that the
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* server socket is created and bound to some well known port. It then
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* listens for and accepts connections. At that point the client and
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* server sockets are ready to communicate with one another utilizing
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* whatever application layer protocol they desire.
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*
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* As with the <code>Socket</code> class, most instance methods of this class
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* simply redirect their calls to an implementation class.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Per Bothner (bothner@cygnus.com)
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*/
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public class ServerSocket
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{
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/**
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* This is the user defined SocketImplFactory, if one is supplied
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*/
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private static SocketImplFactory factory;
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/**
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* This is the SocketImp object to which most instance methods in this
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* class are redirected
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*/
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private SocketImpl impl;
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/**
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* We need to retain the local address even after the socket is closed.
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*/
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private InetSocketAddress local;
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private int port;
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/*
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* This constructor is only used by java.nio.
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*/
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// FIXME: Workaround a bug in gcj.
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//ServerSocket (PlainSocketImpl impl) throws IOException
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ServerSocket(SocketImpl impl) throws IOException
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{
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if (impl == null)
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throw new NullPointerException("impl may not be null");
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this.impl = impl;
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this.impl.create(true);
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setReuseAddress(true);
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}
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/*
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* This method is only used by java.nio.
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*/
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// FIXME: Workaround a bug in gcj.
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//PlainSocketImpl getImpl()
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SocketImpl getImpl()
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{
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return impl;
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}
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/**
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* Constructor that simply sets the implementation.
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*
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* @exception IOException If an error occurs
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*
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* @specnote This constructor is public since JDK 1.4
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*/
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public ServerSocket() throws IOException
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{
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if (factory != null)
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impl = factory.createSocketImpl();
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else
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impl = new PlainSocketImpl();
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impl.create(true);
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}
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/**
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* Creates a server socket and binds it to the specified port. If the
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* port number is 0, a random free port will be chosen. The pending
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* connection queue on this socket will be set to 50.
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*
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* @param port The port number to bind to
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*
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* @exception IOException If an error occurs
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* @exception SecurityException If a security manager exists and its
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* checkListen method doesn't allow the operation
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*/
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public ServerSocket(int port) throws IOException
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{
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this(port, 50);
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}
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/**
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* Creates a server socket and binds it to the specified port. If the
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* port number is 0, a random free port will be chosen. The pending
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* connection queue on this socket will be set to the value passed as
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* arg2.
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*
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* @param port The port number to bind to
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* @param backlog The length of the pending connection queue
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*
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* @exception IOException If an error occurs
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* @exception SecurityException If a security manager exists and its
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* checkListen method doesn't allow the operation
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*/
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public ServerSocket(int port, int backlog) throws IOException
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{
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this(port, backlog, null);
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}
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/**
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* Creates a server socket and binds it to the specified port. If the
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* port number is 0, a random free port will be chosen. The pending
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* connection queue on this socket will be set to the value passed as
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* backlog. The third argument specifies a particular local address to
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* bind t or null to bind to all local address.
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*
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* @param port The port number to bind to
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* @param backlog The length of the pending connection queue
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* @param bindAddr The address to bind to, or null to bind to all addresses
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*
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* @exception IOException If an error occurs
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* @exception SecurityException If a security manager exists and its
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* checkListen method doesn't allow the operation
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*
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* @since 1.1
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*/
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public ServerSocket(int port, int backlog, InetAddress bindAddr)
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throws IOException
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{
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this();
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// bind/listen socket
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bind(new InetSocketAddress(bindAddr, port), backlog);
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}
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/**
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* Binds the server socket to a specified socket address
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*
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* @param endpoint The socket address to bind to
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*
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* @exception IOException If an error occurs
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* @exception IllegalArgumentException If address type is not supported
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* @exception SecurityException If a security manager exists and its
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* checkListen method doesn't allow the operation
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*
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* @since 1.4
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*/
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public void bind(SocketAddress endpoint) throws IOException
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{
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bind(endpoint, 50);
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}
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/**
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* Binds the server socket to a specified socket address
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*
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* @param endpoint The socket address to bind to
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* @param backlog The length of the pending connection queue
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*
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* @exception IOException If an error occurs
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* @exception IllegalArgumentException If address type is not supported
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* @exception SecurityException If a security manager exists and its
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* checkListen method doesn't allow the operation
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*
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* @since 1.4
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*/
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public void bind(SocketAddress endpoint, int backlog)
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throws IOException
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{
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if (isClosed())
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throw new SocketException("ServerSocket is closed");
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if (isBound())
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throw new SocketException("Already bound");
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InetAddress addr;
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int port;
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if (endpoint == null)
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{
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addr = InetAddress.ANY_IF;
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port = 0;
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}
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else if (! (endpoint instanceof InetSocketAddress))
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{
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throw new IllegalArgumentException("Address type not supported");
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}
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else
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{
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InetSocketAddress tmp = (InetSocketAddress) endpoint;
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if (tmp.isUnresolved())
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throw new SocketException("Unresolved address");
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addr = tmp.getAddress();
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port = tmp.getPort();
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}
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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s.checkListen(port);
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try
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{
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impl.bind(addr, port);
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impl.listen(backlog);
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this.port = port;
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local = new InetSocketAddress(
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(InetAddress) impl.getOption(SocketOptions.SO_BINDADDR),
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impl.getLocalPort());
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}
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finally
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{
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try
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{
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if (local == null)
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close();
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}
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catch (IOException _)
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{
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}
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}
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}
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/**
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* This method returns the local address to which this socket is bound
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*
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* @return The socket's local address
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*/
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public InetAddress getInetAddress()
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{
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if (local == null)
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return null;
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return local.getAddress();
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}
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/**
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* This method returns the local port number to which this socket is bound
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*
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* @return The socket's port number
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*/
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public int getLocalPort()
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{
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if (local == null)
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return -1;
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return local.getPort();
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}
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/**
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* Returns the local socket address
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*
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* @return the local socket address, null if not bound
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*
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* @since 1.4
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*/
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public SocketAddress getLocalSocketAddress()
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{
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return local;
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}
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/**
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* Accepts a new connection and returns a connected <code>Socket</code>
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* instance representing that connection. This method will block until a
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* connection is available.
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*
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* @return socket object for the just accepted connection
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*
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* @exception IOException If an error occurs
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* @exception SecurityException If a security manager exists and its
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* checkListen method doesn't allow the operation
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* @exception IllegalBlockingModeException If this socket has an associated
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* channel, and the channel is in non-blocking mode
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* @exception SocketTimeoutException If a timeout was previously set with
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* setSoTimeout and the timeout has been reached
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*/
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public Socket accept() throws IOException
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{
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Socket socket = new Socket();
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try
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{
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implAccept(socket);
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}
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catch (IOException e)
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{
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try
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{
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socket.close();
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}
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catch (IOException e2)
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{
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// Ignore.
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}
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throw e;
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}
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catch (SecurityException e)
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{
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try
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{
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socket.close();
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}
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catch (IOException e2)
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{
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// Ignore.
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}
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throw e;
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}
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return socket;
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}
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/**
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* This protected method is used to help subclasses override
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* <code>ServerSocket.accept()</code>. The passed in socket will be
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* connected when this method returns.
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*
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* @param socket The socket that is used for the accepted connection
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*
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* @exception IOException If an error occurs
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* @exception IllegalBlockingModeException If this socket has an associated
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* channel, and the channel is in non-blocking mode
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*
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* @since 1.1
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*/
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protected final void implAccept(Socket socket) throws IOException
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{
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if (isClosed())
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throw new SocketException("ServerSocket is closed");
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// The Sun spec says that if we have an associated channel and
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// it is in non-blocking mode, we throw an IllegalBlockingModeException.
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// However, in our implementation if the channel itself initiated this
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// operation, then we must honor it regardless of its blocking mode.
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if (getChannel() != null && ! getChannel().isBlocking()
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&& ! ((PlainSocketImpl) getImpl()).isInChannelOperation())
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throw new IllegalBlockingModeException();
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impl.accept(socket.impl);
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socket.bound = true;
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkAccept(socket.getInetAddress().getHostAddress(),
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socket.getPort());
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}
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/**
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* Closes this socket and stops listening for connections
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*
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* @exception IOException If an error occurs
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*/
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public void close() throws IOException
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{
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if (impl != null)
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{
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impl.close();
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impl = null;
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}
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}
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/**
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* Returns the unique <code>ServerSocketChannel</code> object
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* associated with this socket, if any.
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*
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* <p>The socket only has a <code>ServerSocketChannel</code> if its created
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* by <code>ServerSocketChannel.open()</code>.</p>
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*
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* @return the associated socket channel, null if none exists
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*
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* @since 1.4
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*/
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public ServerSocketChannel getChannel()
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{
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return null;
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}
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/**
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* Returns true when the socket is bound, otherwise false
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*
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* @return true if socket is bound, false otherwise
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*
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* @since 1.4
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*/
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public boolean isBound()
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{
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return local != null;
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}
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/**
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* Returns true if the socket is closed, otherwise false
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*
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* @return true if socket is closed, false otherwise
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*
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* @since 1.4
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*/
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public boolean isClosed()
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{
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ServerSocketChannel channel = getChannel();
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return impl == null || (channel != null && ! channel.isOpen());
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}
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/**
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* Sets the value of SO_TIMEOUT. A value of 0 implies that SO_TIMEOUT is
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* disabled (ie, operations never time out). This is the number of
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* milliseconds a socket operation can block before an
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* InterruptedIOException is thrown.
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*
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* @param timeout The new SO_TIMEOUT value
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*
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* @exception SocketException If an error occurs
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*
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* @since 1.1
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*/
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public void setSoTimeout(int timeout) throws SocketException
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{
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if (isClosed())
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throw new SocketException("ServerSocket is closed");
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if (timeout < 0)
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throw new IllegalArgumentException("SO_TIMEOUT value must be >= 0");
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impl.setOption(SocketOptions.SO_TIMEOUT, new Integer(timeout));
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}
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/**
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* Retrieves the current value of the SO_TIMEOUT setting. A value of 0
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* implies that SO_TIMEOUT is disabled (ie, operations never time out).
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* This is the number of milliseconds a socket operation can block before
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* an InterruptedIOException is thrown.
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*
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* @return The value of SO_TIMEOUT
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*
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* @exception IOException If an error occurs
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*
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* @since 1.1
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*/
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public int getSoTimeout() throws IOException
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{
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if (isClosed())
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throw new SocketException("ServerSocket is closed");
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Object timeout = impl.getOption(SocketOptions.SO_TIMEOUT);
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if (! (timeout instanceof Integer))
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throw new IOException("Internal Error");
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return ((Integer) timeout).intValue();
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}
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/**
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* Enables/Disables the SO_REUSEADDR option
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*
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* @param on true if SO_REUSEADDR should be enabled, false otherwise
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*
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* @exception SocketException If an error occurs
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*
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* @since 1.4
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*/
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public void setReuseAddress(boolean on) throws SocketException
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{
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if (isClosed())
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throw new SocketException("ServerSocket is closed");
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impl.setOption(SocketOptions.SO_REUSEADDR, Boolean.valueOf(on));
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}
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/**
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* Checks if the SO_REUSEADDR option is enabled
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*
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* @return true if SO_REUSEADDR is set, false otherwise
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*
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* @exception SocketException If an error occurs
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*
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* @since 1.4
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*/
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public boolean getReuseAddress() throws SocketException
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{
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if (isClosed())
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throw new SocketException("ServerSocket is closed");
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Object reuseaddr = impl.getOption(SocketOptions.SO_REUSEADDR);
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if (! (reuseaddr instanceof Boolean))
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throw new SocketException("Internal Error");
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return ((Boolean) reuseaddr).booleanValue();
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}
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|
|
/**
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* This method sets the value for the system level socket option
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* SO_RCVBUF to the specified value. Note that valid values for this
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* option are specific to a given operating system.
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*
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* @param size The new receive buffer size.
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*
|
|
* @exception SocketException If an error occurs or Socket is not connected
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* @exception IllegalArgumentException If size is 0 or negative
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*
|
|
* @since 1.4
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*/
|
|
public void setReceiveBufferSize(int size) throws SocketException
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{
|
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if (isClosed())
|
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throw new SocketException("ServerSocket is closed");
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|
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if (size <= 0)
|
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throw new IllegalArgumentException("SO_RCVBUF value must be > 0");
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impl.setOption(SocketOptions.SO_RCVBUF, new Integer(size));
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}
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|
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/**
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* This method returns the value of the system level socket option
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* SO_RCVBUF, which is used by the operating system to tune buffer
|
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* sizes for data transfers.
|
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*
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* @return The receive buffer size.
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*
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* @exception SocketException If an error occurs or Socket is not connected
|
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*
|
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* @since 1.4
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*/
|
|
public int getReceiveBufferSize() throws SocketException
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{
|
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if (isClosed())
|
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throw new SocketException("ServerSocket is closed");
|
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|
|
Object buf = impl.getOption(SocketOptions.SO_RCVBUF);
|
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|
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if (! (buf instanceof Integer))
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throw new SocketException("Internal Error: Unexpected type");
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|
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return ((Integer) buf).intValue();
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}
|
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|
|
/**
|
|
* Returns the value of this socket as a <code>String</code>.
|
|
*
|
|
* @return This socket represented as a <code>String</code>.
|
|
*/
|
|
public String toString()
|
|
{
|
|
if (! isBound())
|
|
return "ServerSocket[unbound]";
|
|
|
|
return ("ServerSocket[addr=" + getInetAddress() + ",port="
|
|
+ port + ",localport=" + getLocalPort() + "]");
|
|
}
|
|
|
|
/**
|
|
* Sets the <code>SocketImplFactory</code> for all
|
|
* <code>ServerSocket</code>'s. This may only be done
|
|
* once per virtual machine. Subsequent attempts will generate an
|
|
* exception. Note that a <code>SecurityManager</code> check is made prior
|
|
* to setting the factory. If insufficient privileges exist to set the
|
|
* factory, an exception will be thrown
|
|
*
|
|
* @param fac the factory to set
|
|
*
|
|
* @exception SecurityException If this operation is not allowed by the
|
|
* <code>SecurityManager</code>.
|
|
* @exception SocketException If the factory object is already defined
|
|
* @exception IOException If any other error occurs
|
|
*/
|
|
public static synchronized void setSocketFactory(SocketImplFactory fac)
|
|
throws IOException
|
|
{
|
|
if (factory != null)
|
|
throw new SocketException("SocketFactory already defined");
|
|
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null)
|
|
sm.checkSetFactory();
|
|
|
|
factory = fac;
|
|
}
|
|
}
|