opendaylight/netconf/netconf-ssh/src/main/java/org/opendaylight/controller/netconf/ssh/SshProxyClientHandler.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.netconf.ssh;
  10
  11 import io.netty.buffer.ByteBuf;
  12 import io.netty.buffer.Unpooled;
  13 import io.netty.channel.ChannelHandlerContext;
  14 import io.netty.channel.ChannelInboundHandlerAdapter;
  15 import org.apache.sshd.common.io.IoInputStream;
  16 import org.apache.sshd.common.io.IoOutputStream;
  17 import org.apache.sshd.server.ExitCallback;
  18 import org.opendaylight.controller.netconf.nettyutil.handler.ssh.client.AsyncSshHandlerReader;
  19 import org.opendaylight.controller.netconf.nettyutil.handler.ssh.client.AsyncSshHandlerWriter;
  20 import org.opendaylight.controller.netconf.util.messages.NetconfHelloMessageAdditionalHeader;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 /**
  25  * Netty handler that reads SSH from remote client and writes to delegate server and reads from delegate server and writes to remote client
  26  */
  27 final class SshProxyClientHandler extends ChannelInboundHandlerAdapter {
  28
  29     private static final Logger logger = LoggerFactory.getLogger(SshProxyClientHandler.class);
  30
  31     private final IoInputStream in;
  32     private final IoOutputStream out;
  33
  34     private AsyncSshHandlerReader asyncSshHandlerReader;
  35     private AsyncSshHandlerWriter asyncSshHandlerWriter;
  36
  37     private final NetconfHelloMessageAdditionalHeader netconfHelloMessageAdditionalHeader;
  38     private final ExitCallback callback;
  39
  40     public SshProxyClientHandler(final IoInputStream in, final IoOutputStream out,
  41                                  final NetconfHelloMessageAdditionalHeader netconfHelloMessageAdditionalHeader,
  42                                  final ExitCallback callback) {
  43         this.in = in;
  44         this.out = out;
  45         this.netconfHelloMessageAdditionalHeader = netconfHelloMessageAdditionalHeader;
  46         this.callback = callback;
  47     }
  48
  49     @Override
  50     public void channelActive(final ChannelHandlerContext ctx) throws Exception {
  51         writeAdditionalHeader(ctx);
  52
  53         asyncSshHandlerWriter = new AsyncSshHandlerWriter(out);
  54         asyncSshHandlerReader = new AsyncSshHandlerReader(new AutoCloseable() {
  55             @Override
  56             public void close() throws Exception {
  57                 // Close both sessions (delegate server and remote client)
  58                 ctx.fireChannelInactive();
  59                 ctx.disconnect();
  60                 ctx.close();
  61                 asyncSshHandlerReader.close();
  62                 asyncSshHandlerWriter.close();
  63             }
  64         }, new AsyncSshHandlerReader.ReadMsgHandler() {
  65             @Override
  66             public void onMessageRead(final ByteBuf msg) {
  67                 if(logger.isTraceEnabled()) {
  68                     logger.trace("Forwarding message for client: {} on channel: {}, message: {}",
  69                             netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel(), AsyncSshHandlerWriter.byteBufToString(msg));
  70                 }
  71                 // Just forward to delegate
  72                 ctx.writeAndFlush(msg);
  73             }
  74         }, "ssh" + netconfHelloMessageAdditionalHeader.getAddress(), in);
  75
  76
  77         super.channelActive(ctx);
  78     }
  79
  80     private void writeAdditionalHeader(final ChannelHandlerContext ctx) {
  81         ctx.writeAndFlush(Unpooled.copiedBuffer(netconfHelloMessageAdditionalHeader.toFormattedString().getBytes()));
  82     }
  83
  84     @Override
  85     public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception {
  86        asyncSshHandlerWriter.write(ctx, msg, ctx.newPromise());
  87     }
  88
  89     @Override
  90     public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
  91         logger.debug("Internal connection to netconf server was dropped for client: {} on channel: ",
  92                 netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel());
  93         callback.onExit(1, "Internal connection to netconf server was dropped for client: " +
  94                 netconfHelloMessageAdditionalHeader.getAddress() + " on channel: " + ctx.channel());
  95         super.channelInactive(ctx);
  96     }
  97
  98
  99 }