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.Unpooled;
  12 import io.netty.channel.ChannelHandlerContext;
  13 import io.netty.channel.ChannelInboundHandlerAdapter;
  14 import java.nio.charset.StandardCharsets;
  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(() -> {
  56             // Close both sessions (delegate server and remote client)
  57             ctx.fireChannelInactive();
  58             ctx.disconnect();
  59             ctx.close();
  60             asyncSshHandlerReader.close();
  61             asyncSshHandlerWriter.close();
  62         }, msg -> {
  63             if (LOG.isTraceEnabled()) {
  64                 LOG.trace("Forwarding message for client: {} on channel: {}, message: {}",
  65                         netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel(),
  66                         AsyncSshHandlerWriter.byteBufToString(msg));
  67             }
  68             // Just forward to delegate
  69             ctx.writeAndFlush(msg);
  70         }, "ssh" + netconfHelloMessageAdditionalHeader.getAddress(), in);
  71
  72
  73         super.channelActive(ctx);
  74     }
  75
  76     private void writeAdditionalHeader(final ChannelHandlerContext ctx) {
  77         ctx.writeAndFlush(Unpooled.copiedBuffer(netconfHelloMessageAdditionalHeader.toFormattedString()
  78                 .getBytes(StandardCharsets.UTF_8)));
  79     }
  80
  81     @Override
  82     public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception {
  83         asyncSshHandlerWriter.write(ctx, msg, ctx.newPromise());
  84     }
  85
  86     @Override
  87     public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
  88         LOG.debug("Internal connection to netconf server was dropped for client: {} on channel: ",
  89                 netconfHelloMessageAdditionalHeader.getAddress(), ctx.channel());
  90         callback.onExit(1, "Internal connection to netconf server was dropped for client: "
  91                 + netconfHelloMessageAdditionalHeader.getAddress() + " on channel: " + ctx.channel());
  92         super.channelInactive(ctx);
  93     }
  94
  95
  96 }