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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 com.tigervnc.rdr.FdInStream;
- import com.tigervnc.rdr.FdOutStream;
- import com.tigervnc.rdr.Exception;
- import com.tigervnc.rfb.LogWriter;
-
- import java.io.IOException;
- import java.net.InetAddress;
- import java.net.InetSocketAddress;
- import java.net.SocketAddress;
- import java.net.UnknownHostException;
- import java.nio.*;
- import java.nio.channels.*;
-
- import java.util.Set;
- import java.util.Iterator;
-
- public class TcpSocket extends Socket {
-
- // -=- Socket initialisation
- public static boolean socketsInitialised = false;
- public static void initSockets() {
- if (socketsInitialised)
- return;
- socketsInitialised = true;
- }
-
- // -=- TcpSocket
-
- public TcpSocket(SocketDescriptor sock, boolean close) {
- super(new FdInStream(sock), new FdOutStream(sock), true);
- closeFd = close;
- }
-
- public TcpSocket(SocketDescriptor sock) {
- this(sock, true);
- }
-
- public TcpSocket(String host, int port) throws Exception {
- closeFd = true;
- SocketDescriptor sock = null;
- InetAddress addr = null;
- boolean result = false;
-
- // - Create a socket
- initSockets();
-
- try {
- addr = java.net.InetAddress.getByName(host);
- } catch(UnknownHostException e) {
- throw new Exception("unable to resolve host by name: "+e.toString());
- }
-
- try {
- sock = new SocketDescriptor();
- } catch(Exception e) {
- throw new SocketException("unable to create socket: "+e.toString());
- }
-
- /* Attempt to connect to the remote host */
- try {
- result = sock.connect(new InetSocketAddress(addr, port));
- Selector selector = Selector.open();
- SelectionKey connect_key =
- sock.socket().getChannel().register(selector, SelectionKey.OP_CONNECT);
- // Try for the connection for 3000ms
- while (selector.select(3000) > 0) {
- while (!result) {
-
- Set keys = selector.selectedKeys();
- Iterator i = keys.iterator();
-
- while (i.hasNext()) {
- SelectionKey key = (SelectionKey)i.next();
-
- // Remove the current key
- i.remove();
-
- // Attempt a connection
- if (key.isConnectable()) {
- if (sock.isConnectionPending())
- sock.finishConnect();
- result = true;
- }
- }
- }
- }
- if (!result)
- throw new SocketException("unable to connect to socket: Host is down");
- } catch(java.io.IOException e) {
- throw new SocketException("unable to connect:"+e.getMessage());
- }
-
- // Disable Nagle's algorithm, to reduce latency
- enableNagles(sock, false);
-
- // Create the input and output streams
- instream = new FdInStream(sock);
- outstream = new FdOutStream(sock);
- ownStreams = true;
- }
-
- protected void finalize() throws Exception {
- if (closeFd)
- try {
- ((SocketDescriptor)getFd()).close();
- } catch (IOException e) {
- throw new Exception(e.getMessage());
- }
- }
-
- public int getMyPort() {
- return getSockPort();
- }
-
- public String getPeerAddress() {
- InetAddress peer = ((SocketDescriptor)getFd()).socket().getInetAddress();
- if (peer != null)
- return peer.getHostAddress();
- return "";
- }
-
- public String getPeerName() {
- InetAddress peer = ((SocketDescriptor)getFd()).socket().getInetAddress();
- if (peer != null)
- return peer.getHostName();
- return "";
- }
-
- public int getPeerPort() {
- int port = ((SocketDescriptor)getFd()).socket().getPort();
- return port;
- }
-
- public String getPeerEndpoint() {
- String address = getPeerAddress();
- int port = getPeerPort();
- return address+"::"+port;
- }
-
- public boolean sameMachine() throws Exception {
- try {
- SocketAddress peeraddr = ((SocketDescriptor)getFd()).getRemoteAddress();
- SocketAddress myaddr = ((SocketDescriptor)getFd()).getLocalAddress();
- return myaddr.equals(peeraddr);
- } catch (IOException e) {
- throw new Exception(e.getMessage());
- }
- }
-
- public void shutdown() throws Exception {
- super.shutdown();
- try {
- ((SocketDescriptor)getFd()).shutdown();
- } catch (IOException e) {
- throw new Exception(e.getMessage());
- }
- }
-
- public void close() throws IOException {
- ((SocketDescriptor)getFd()).close();
- }
-
- public static boolean enableNagles(SocketDescriptor sock, boolean enable) {
- try {
- sock.channel.socket().setTcpNoDelay(!enable);
- } catch(java.net.SocketException e) {
- vlog.error("unable to setsockopt TCP_NODELAY: "+e.getMessage());
- return false;
- }
- return true;
- }
-
- public static boolean isSocket(java.net.Socket sock) {
- return sock.getClass().toString().equals("com.tigervnc.net.Socket");
- }
-
- public boolean isConnected() {
- return ((SocketDescriptor)getFd()).isConnected();
- }
-
- public int getSockPort() {
- return ((SocketDescriptor)getFd()).socket().getLocalPort();
- }
-
- /* Tunnelling support. */
- public static int findFreeTcpPort() {
- java.net.ServerSocket sock;
- int port;
- try {
- sock = new java.net.ServerSocket(0);
- port = sock.getLocalPort();
- sock.close();
- } catch (java.io.IOException e) {
- throw new SocketException("unable to create socket: "+e.toString());
- }
- return port;
- }
-
- private boolean closeFd;
- static LogWriter vlog = new LogWriter("TcpSocket");
-
- }
-
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