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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;
/**
* Implementation of Request to send a X11 request.
*
* X11 forwarding may be requested for a session by sending a
* SSH_MSG_CHANNEL_REQUEST message. It is recommended that the
* 'x11 authentication cookie' that is sent be a fake, random cookie, and that
* the cookie be checked and replaced by the real cookie when a connection
* request is received.
*
* X11 connection forwarding should stop when the session channel is closed.
* However, already opened forwardings should not be automatically closed when
* the session channel is closed.
*
*
*
* @author Atsuhiko Yamanaka
* @author Michael Laudati
*/
final class RequestX11 extends Request {
/** Constant name for X11 forwarding request. */
static final String X11_REQUEST = "x11-req";
/** Constant name for X11 authentication protocol. */
static final String X11_MIT_MAGIC_COOKIE = "MIT-MAGIC-COOKIE-1";
@Override
void request(Session session, Channel channel) throws Exception {
super.request(session, channel);
// byte SSH_MSG_CHANNEL_REQUEST(98)
// uint32 recipient channel
// string request type // "x11-req"
// boolean want reply // 0
// boolean single connection
// string x11 authentication protocol // "MIT-MAGIC-COOKIE-1".
// string x11 authentication cookie
// uint32 x11 screen number
Buffer buffer = new Buffer(1024);
Packet packet = new Packet(buffer);
packet.reset();
buffer.putByte(SSH_MSG_CHANNEL_REQUEST);
buffer.putInt(channel.getRecipient());
buffer.putString(X11_REQUEST);
buffer.putBoolean(waitForReply());
buffer.putByte((byte) 0); // TODO Allow value to be set (single connection)
buffer.putString(X11_MIT_MAGIC_COOKIE);
buffer.putString(ChannelX11.getFakedCookie(session));
buffer.putInt(0);
write(packet);
session._x11Forwarding = true; // Update session X11 forwarding is allowed
}
}