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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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