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**vngx-jsch** (beta) is an updated version of the popular JSch SSH library
written in pure Java. It has been updated to Java 6 with all the latest
language features and improved code clarity.
/*
* Copyright (c) 2002-2010 Atsuhiko Yamanaka, JCraft,Inc. All rights reserved.
* Copyright (c) 2010-2011 Michael Laudati, N1 Concepts LLC.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
* INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.vngx.jsch;
import org.vngx.jsch.exception.JSchException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.net.ServerSocketFactory;
/**
* TODO Synchronization issues...
* TODO Shouldn't local port monitoring be unique per port... even if you have
* more than one session, can't only one bind to local port?
*
* @author Atsuhiko Yamanaka
* @author Michael Laudati
*/
class PortWatcher implements Runnable {
/** Pool of registered port watcher instances/ */
private static final List PORT_WATCHER_POOL = Collections.synchronizedList(new ArrayList());
/** TODO ??? */
private static final InetAddress ANY_LOCAL;
/** Static initialization of any local address constant. */
static {
InetAddress temp = null;
try {
temp = InetAddress.getByName("0.0.0.0");
} catch(UnknownHostException e) { /* Ignore error, let constant be null. */ }
ANY_LOCAL = temp;
}
/** Session port watcher belongs to. */
Session _session;
/** Local port bound to port watcher. */
int _localPort;
/** Remote port bound to port watcher. */
int _remotePort;
/** Host name bound to port watcher. */
String _host;
/** Address bound to port watcher. */
InetAddress _boundAddress;
/** Thread which is running this port watcher instance. */
Runnable _thread;
/** Server socket bound to the address. */
ServerSocket _serverSocket;
/**
* Returns a collection of string descriptions for the ports which are
* currently being forwarded for the specified session.
*
* @param session to retrieve port information about
* @return descriptions of forwarded ports for session
*/
static List getPortForwarding(Session session) {
List ports = new ArrayList();
synchronized( PORT_WATCHER_POOL ) {
for( PortWatcher p : PORT_WATCHER_POOL ) {
if( p._session == session ) {
ports.add(p._localPort + ":" + p._host + ":" + p._remotePort);
}
}
}
return ports;
}
/**
* Returns the PortWatcher instance for the specified session,
* address and local port.
*
* @param session
* @param address
* @param localPort
* @return port watcher instance
* @throws JSchException
*/
static PortWatcher getPort(Session session, String address, int localPort) throws JSchException {
InetAddress addr;
try {
addr = InetAddress.getByName(address);
} catch(UnknownHostException uhe) {
throw new JSchException("PortForwardingL: invalid address " + address + " specified", uhe);
}
synchronized( PORT_WATCHER_POOL ) {
for( PortWatcher p : PORT_WATCHER_POOL ) {
if( p._session == session && p._localPort == localPort &&
(ANY_LOCAL != null && p._boundAddress.equals(ANY_LOCAL)) || p._boundAddress.equals(addr) ) {
return p;
}
}
return null;
}
}
/**
* Creates an instance of PortWatcher for the specified values
* and registers it with the pool. If a port watcher already exists for the
* specified values, an exception is thrown.
*
* @param session
* @param address
* @param localPort
* @param host
* @param remotePort
* @param ssf
* @return created port watcher instance
* @throws JSchException
*/
static PortWatcher addPort(Session session, String address, int localPort, String host, int remotePort, ServerSocketFactory ssf) throws JSchException {
if( getPort(session, address, localPort) != null ) {
throw new JSchException("PortForwardingL: local port " + address + ":" + localPort + " is already registered");
}
PortWatcher pw = new PortWatcher(session, address, localPort, host, remotePort, ssf);
PORT_WATCHER_POOL.add(pw);
return pw;
}
/**
* Deletes the port watcher instance from the registered pool for the
* specified values.
*
* TODO Shouldn't removing the instance be synchronized on pool?
*
* @param session
* @param address
* @param lport
* @throws JSchException
*/
static void delPort(Session session, String address, int localPort) throws JSchException {
PortWatcher pw = getPort(session, address, localPort);
if( pw == null ) {
throw new JSchException("PortForwardingL: local port " + address + ":" + localPort + " is not registered");
}
pw.delete();
PORT_WATCHER_POOL.remove(pw);
}
/**
* Deletes all port watcher instances registered for the specified session.
*
* @param session
*/
static void delPort(Session session) {
synchronized ( PORT_WATCHER_POOL ) {
PortWatcher[] foo = new PortWatcher[PORT_WATCHER_POOL.size()];
int count = 0;
for( PortWatcher p : PORT_WATCHER_POOL ) {
if( p._session == session ) {
p.delete();
foo[count++] = p;
}
}
for( int i = 0; i < count; i++ ) {
PORT_WATCHER_POOL.remove(foo[i]);
}
}
}
/**
* Creates a new instance of PortWatcher for the specified
* session, address, local port, host, remote port and socket factory.
*
* @param session
* @param address
* @param localPort
* @param host
* @param remotePort
* @param factory for creating server sockets
* @throws JSchException
*/
PortWatcher(Session session, String address, int localPort, String host, int remotePort, ServerSocketFactory factory) throws JSchException {
_session = session;
_localPort = localPort;
_host = host;
_remotePort = remotePort;
try {
_boundAddress = InetAddress.getByName(address);
_serverSocket = (factory == null)
? new ServerSocket(localPort, 0, _boundAddress)
: factory.createServerSocket(localPort, 0, _boundAddress);
} catch(Exception e) {
throw new JSchException("PortForwardingL: local port " + address + ":" + localPort + " cannot be bound", e);
}
if( localPort == 0 ) {
int assigned = _serverSocket.getLocalPort();
if( assigned != -1 ) {
_localPort = assigned;
}
}
}
@Override
public void run() {
_thread = this;
try {
while( _thread != null ) {
Socket socket = _serverSocket.accept();
socket.setTcpNoDelay(true);
ChannelDirectTCPIP channel = new ChannelDirectTCPIP(_session);
channel.init();
channel.setInputStream(socket.getInputStream());
channel.setOutputStream(socket.getOutputStream());
channel.setHost(_host);
channel.setPort(_remotePort);
channel.setOriginatorIPAddress(socket.getInetAddress().getHostAddress());
channel.setOriginatorPort(socket.getPort());
channel.connect();
}
} catch(Exception e) {
// TODO Error handling?
}
delete(); // Delete after completion of running
}
/**
* Deletes the instance by stopping the currently running thread and closing
* the open socket connection.
*/
void delete() {
_thread = null;
try {
if( _serverSocket != null ) {
_serverSocket.close();
}
_serverSocket = null;
} catch(Exception e) {
// TODO Error handling?
}
}
}