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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2012 Brian P. Hinz
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package com.tigervnc.network;
import java.io.IOException;
import java.lang.Exception;
import java.nio.*;
import java.nio.channels.*;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.util.Set;
import java.util.Iterator;
public class TcpListener extends SocketListener {
public static boolean socketsInitialised = false;
public TcpListener(String listenaddr, int port, boolean localhostOnly,
SocketDescriptor sock, boolean close_) throws Exception {
closeFd = close_;
if (sock != null) {
fd = sock;
return;
}
TcpSocket.initSockets();
try {
channel = ServerSocketChannel.open();
channel.configureBlocking(false);
} catch(IOException e) {
throw new Exception("unable to create listening socket: "+e.toString());
}
// - Bind it to the desired port
InetAddress addr = null;
try {
if (localhostOnly) {
addr = InetAddress.getByName(null);
} else if (listenaddr != null) {
addr = java.net.InetAddress.getByName(listenaddr);
} else {
addr = InetAddress.getByName("0.0.0.0");
}
} catch (UnknownHostException e) {
throw new Exception(e.getMessage());
}
try {
channel.socket().bind(new InetSocketAddress(addr, port));
} catch (IOException e) {
throw new Exception("unable to bind listening socket: "+e.toString());
}
// - Set it to be a listening socket
try {
selector = Selector.open();
channel.register(selector, SelectionKey.OP_ACCEPT);
} catch (IOException e) {
throw new Exception("unable to set socket to listening mode: "+e.toString());
}
}
public TcpListener(String listenaddr, int port) throws Exception {
this(listenaddr, port, false, null, true);
}
protected void finalize() throws Exception {
if (closeFd)
try {
((SocketDescriptor)getFd()).close();
} catch (IOException e) {
throw new Exception(e.getMessage());
}
}
public void shutdown() throws Exception {
try {
((SocketDescriptor)getFd()).shutdown();
} catch (IOException e) {
throw new Exception(e.getMessage());
}
}
public TcpSocket accept() {
SocketChannel new_sock = null;
// Accept an incoming connection
try {
if (selector.select(0) > 0) {
Set<SelectionKey> keys = selector.selectedKeys();
Iterator<SelectionKey> iter = keys.iterator();
while (iter.hasNext()) {
SelectionKey key = (SelectionKey)iter.next();
iter.remove();
if (key.isAcceptable()) {
new_sock = channel.accept();
break;
}
}
keys.clear();
if (new_sock == null)
return null;
}
} catch (IOException e) {
throw new SocketException("unable to accept new connection: "+e.toString());
}
// Disable Nagle's algorithm, to reduce latency
try {
new_sock.socket().setTcpNoDelay(true);
} catch (java.net.SocketException e) {
throw new SocketException(e.getMessage());
}
// Create the socket object & check connection is allowed
SocketDescriptor fd = null;
try {
fd = new SocketDescriptor();
} catch (java.lang.Exception e) {
throw new SocketException(e.getMessage());
}
fd.setChannel(new_sock);
TcpSocket s = new TcpSocket(fd);
return s;
}
public int getMyPort() {
return ((SocketDescriptor)getFd()).socket().getLocalPort();
}
private boolean closeFd;
private ServerSocketChannel channel;
private Selector selector;
}
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