netconf/netconf-ssh/src/main/java/org/opendaylight/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.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.netconf.api.messages.NetconfHelloMessageAdditionalHeader;
  19 import org.opendaylight.netconf.nettyutil.handler.ssh.client.AsyncSshHandlerReader;
  20 import org.opendaylight.netconf.nettyutil.handler.ssh.client.AsyncSshHandlerWriter;
  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
  26  * and reads from delegate server and writes to remote client.
  27  */
  28 final class SshProxyClientHandler extends ChannelInboundHandlerAdapter {
  29
  30     private static final Logger LOG = LoggerFactory.getLogger(SshProxyClientHandler.class);
  31
  32     private final IoInputStream in;
  33     private final IoOutputStream out;
  34
  35     private AsyncSshHandlerReader asyncSshHandlerReader;
  36     private AsyncSshHandlerWriter asyncSshHandlerWriter;
  37
  38     private final NetconfHelloMessageAdditionalHeader netconfHelloMessageAdditionalHeader;
  39     private final ExitCallback callback;
  40
  41     SshProxyClientHandler(final IoInputStream in, final IoOutputStream out,
  42                           final NetconfHelloMessageAdditionalHeader netconfHelloMessageAdditionalHeader,
  43                           final ExitCallback callback) {
  44         this.in = in;
  45         this.out = out;
  46         this.netconfHelloMessageAdditionalHeader = netconfHelloMessageAdditionalHeader;
  47         this.callback = callback;
  48     }
  49
  50     @Override
  51     public void channelActive(final ChannelHandlerContext ctx) throws Exception {
  52         writeAdditionalHeader(ctx);
  53
  54         asyncSshHandlerWriter = new AsyncSshHandlerWriter(out);
  55         asyncSshHandlerReader = new AsyncSshHandlerReader(new AutoCloseable() {
  56             @Override
  57             public void close() throws Exception {
  58                 // Close both sessions (delegate server and remote client)
  59                 ctx.fireChannelInactive();
  60                 ctx.disconnect();
  61                 ctx.close();
  62                 asyncSshHandlerReader.close();
  63                 asyncSshHandlerWriter.close();
  64             }
  65         }, new AsyncSshHandlerReader.ReadMsgHandler() {
  66             @Override
  67             public void onMessageRead(final ByteBuf msg) {
  68                 if (LOG.isTraceEnabled()) {
  69                     LOG.trace("Forwarding message for client: {} on channel: {}, message: {}",
  70                             netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel(),
  71                             AsyncSshHandlerWriter.byteBufToString(msg));
  72                 }
  73                 // Just forward to delegate
  74                 ctx.writeAndFlush(msg);
  75             }
  76         }, "ssh" + netconfHelloMessageAdditionalHeader.getAddress(), in);
  77
  78
  79         super.channelActive(ctx);
  80     }
  81
  82     private void writeAdditionalHeader(final ChannelHandlerContext ctx) {
  83         ctx.writeAndFlush(Unpooled.copiedBuffer(netconfHelloMessageAdditionalHeader.toFormattedString().getBytes()));
  84     }
  85
  86     @Override
  87     public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception {
  88         asyncSshHandlerWriter.write(ctx, msg, ctx.newPromise());
  89     }
  90
  91     @Override
  92     public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
  93         LOG.debug("Internal connection to netconf server was dropped for client: {} on channel: ",
  94                 netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel());
  95         callback.onExit(1, "Internal connection to netconf server was dropped for client: "
  96                 + netconfHelloMessageAdditionalHeader.getAddress() + " on channel: " + ctx.channel());
  97         super.channelInactive(ctx);
  98     }
  99
 100
 101 }