Java tutorial
/* * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 which accompanies this distribution, * and is available at http://www.eclipse.org/legal/epl-v10.html */ package org.opendaylight.controller.netconf.nettyutil.handler.ssh; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelOutboundHandlerAdapter; import io.netty.channel.ChannelPromise; import java.io.IOException; import java.net.SocketAddress; import org.opendaylight.controller.netconf.nettyutil.handler.ssh.client.SshClient; import org.opendaylight.controller.netconf.nettyutil.handler.ssh.authentication.AuthenticationHandler; import org.opendaylight.controller.netconf.nettyutil.handler.ssh.client.Invoker; import org.opendaylight.controller.netconf.nettyutil.handler.ssh.client.SshClientAdapter; import org.opendaylight.controller.netconf.nettyutil.handler.ssh.virtualsocket.VirtualSocket; /** * Netty SSH handler class. Acts as interface between Netty and SSH library. All standard Netty message handling * stops at instance of this class. All downstream events are handed of to wrapped {@link org.opendaylight.controller.netconf.nettyutil.handler.ssh.client.SshClientAdapter}; */ public class SshHandler extends ChannelOutboundHandlerAdapter { private static final String SOCKET = "socket"; private final VirtualSocket virtualSocket = new VirtualSocket(); private final SshClientAdapter sshClientAdapter; public SshHandler(AuthenticationHandler authenticationHandler, Invoker invoker) throws IOException { SshClient sshClient = new SshClient(virtualSocket, authenticationHandler); this.sshClientAdapter = new SshClientAdapter(sshClient, invoker); } @Override public void handlerAdded(ChannelHandlerContext ctx) { if (ctx.channel().pipeline().get(SOCKET) == null) { ctx.channel().pipeline().addFirst(SOCKET, virtualSocket); } } @Override public void handlerRemoved(ChannelHandlerContext ctx) { if (ctx.channel().pipeline().get(SOCKET) != null) { ctx.channel().pipeline().remove(SOCKET); } } @Override public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws IOException { this.sshClientAdapter.write((ByteBuf) msg); } @Override public void connect(final ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) { ctx.connect(remoteAddress, localAddress, promise); promise.addListener(new ChannelFutureListener() { public void operationComplete(ChannelFuture channelFuture) { sshClientAdapter.start(ctx); } }); } @Override public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) { sshClientAdapter.stop(promise); } }