/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.server.session;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.EnumSet;
import java.util.Set;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoEventType;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.executor.ExecutorFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
import org.apache.sshd.client.channel.AbstractClientChannel;
import org.apache.sshd.client.future.DefaultOpenFuture;
import org.apache.sshd.client.future.OpenFuture;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.SshException;
import org.apache.sshd.common.channel.ChannelOutputStream;
import org.apache.sshd.common.util.Buffer;
import org.apache.sshd.server.ForwardingFilter;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class TcpipForwardSupport extends IoHandlerAdapter {
private final ServerSession session;
private IoAcceptor acceptor;
public TcpipForwardSupport(ServerSession session) {
this.session = session;
}
public synchronized void initialize() {
if (this.acceptor == null) {
NioSocketAcceptor acceptor = new NioSocketAcceptor();
acceptor.setHandler(this);
acceptor.setReuseAddress(true);
acceptor.getFilterChain().addLast("executor", new ExecutorFilter(EnumSet.complementOf(EnumSet.of(IoEventType.SESSION_CREATED)).toArray(new IoEventType[0])));
this.acceptor = acceptor;
}
}
public synchronized void close() {
if (acceptor != null) {
acceptor.dispose();
acceptor = null;
}
}
synchronized void request(Buffer buffer, boolean wantReply) throws IOException {
String address = buffer.getString();
int port = buffer.getInt();
InetSocketAddress addr;
try {
addr = new InetSocketAddress(address, port);
} catch (RuntimeException e) {
addr = null;
}
final ForwardingFilter filter = session.getServerFactoryManager().getForwardingFilter();
if (addr == null || filter == null || !filter.canListen(addr, session)) {
if (wantReply) {
buffer = session.createBuffer(SshConstants.Message.SSH_MSG_REQUEST_FAILURE, 0);
session.writePacket(buffer);
}
return;
}
initialize();
Set<SocketAddress> a1 = acceptor.getLocalAddresses();
try {
acceptor.bind(addr);
} catch (IOException bindErr) {
if (acceptor.getLocalAddresses().isEmpty()) {
close();
}
if (wantReply) {
buffer = session.createBuffer(SshConstants.Message.SSH_MSG_REQUEST_FAILURE, 0);
session.writePacket(buffer);
}
return;
}
Set<SocketAddress> a2 = acceptor.getLocalAddresses();
a2.removeAll(a1);
if (a2.size() == 1) {
SocketAddress a = a2.iterator().next();
if (a instanceof InetSocketAddress) {
port = ((InetSocketAddress) a).getPort();
}
}
if (wantReply){
buffer = session.createBuffer(SshConstants.Message.SSH_MSG_REQUEST_SUCCESS, 0);
buffer.putInt(port);
session.writePacket(buffer);
}
}
synchronized void cancel(Buffer buffer, boolean wantReply) throws IOException {
String address = buffer.getString();
int port = buffer.getInt();
if (acceptor != null) {
acceptor.unbind(new InetSocketAddress(address, port));
}
if (wantReply) {
buffer = session.createBuffer(SshConstants.Message.SSH_MSG_REQUEST_SUCCESS, 0);
session.writePacket(buffer);
}
}
@Override
public void sessionCreated(IoSession session) throws Exception {
ChannelForwardedTcpip channel = new ChannelForwardedTcpip(session);
session.setAttribute(ChannelForwardedTcpip.class, channel);
this.session.registerChannel(channel);
OpenFuture future = channel.open().await();
Throwable t = future.getException();
if (t instanceof Exception) {
throw (Exception) t;
} else if (t != null) {
throw new Exception(t);
}
}
@Override
public void sessionClosed(IoSession session) throws Exception {
ChannelForwardedTcpip channel = (ChannelForwardedTcpip) session.getAttribute(ChannelForwardedTcpip.class);
channel.close(false);
}
@Override
public void messageReceived(IoSession session, Object message) throws Exception {
ChannelForwardedTcpip channel = (ChannelForwardedTcpip) session.getAttribute(ChannelForwardedTcpip.class);
IoBuffer ioBuffer = (IoBuffer) message;
int r = ioBuffer.remaining();
byte[] b = new byte[r];
ioBuffer.get(b, 0, r);
channel.getOut().write(b, 0, r);
channel.getOut().flush();
}
@Override
public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
cause.printStackTrace();
session.close(false);
}
public static class ChannelForwardedTcpip extends AbstractClientChannel {
private final IoSession serverSession;
public ChannelForwardedTcpip(IoSession serverSession) {
super("forwarded-tcpip");
this.serverSession = serverSession;
}
public synchronized OpenFuture open() throws Exception {
InetSocketAddress remote = (InetSocketAddress) serverSession.getRemoteAddress();
InetSocketAddress local = (InetSocketAddress) serverSession.getLocalAddress();
if (closeFuture.isClosed()) {
throw new SshException("Session has been closed");
}
openFuture = new DefaultOpenFuture(lock);
log.info("Send SSH_MSG_CHANNEL_OPEN on channel {}", id);
Buffer buffer = session.createBuffer(SshConstants.Message.SSH_MSG_CHANNEL_OPEN, 0);
buffer.putString(type);
buffer.putInt(id);
buffer.putInt(localWindow.getSize());
buffer.putInt(localWindow.getPacketSize());
buffer.putString(local.getHostName());
buffer.putInt(local.getPort());
buffer.putString(remote.getHostName());
buffer.putInt(remote.getPort());
session.writePacket(buffer);
return openFuture;
}
@Override
protected synchronized void doOpen() throws Exception {
out = new ChannelOutputStream(this, remoteWindow, log, SshConstants.Message.SSH_MSG_CHANNEL_DATA);
}
@Override
protected synchronized void doClose() {
serverSession.close(false);
super.doClose();
}
protected synchronized void doWriteData(byte[] data, int off, int len) throws IOException {
IoBuffer buf = IoBuffer.allocate(len);
buf.put(data, off, len);
buf.flip();
localWindow.consumeAndCheck(len);
serverSession.write(buf);
}
@Override
public void handleEof() throws IOException {
super.handleEof();
serverSession.close(false);
}
}
}