netconf/callhome-protocol/src/main/java/org/opendaylight/netconf/callhome/protocol/CallHomeSessionContext.java

   1 /*
   2  * Copyright (c) 2016 Brocade Communication Systems 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.callhome.protocol;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.base.Throwables;
  13 import io.netty.channel.EventLoopGroup;
  14 import io.netty.util.concurrent.GlobalEventExecutor;
  15 import io.netty.util.concurrent.Promise;
  16 import java.io.IOException;
  17 import java.net.InetSocketAddress;
  18 import java.net.SocketAddress;
  19 import java.security.PublicKey;
  20 import java.util.concurrent.ConcurrentHashMap;
  21 import java.util.concurrent.ConcurrentMap;
  22 import javax.annotation.Nullable;
  23 import javax.annotation.concurrent.GuardedBy;
  24 import org.apache.sshd.ClientChannel;
  25 import org.apache.sshd.ClientSession;
  26 import org.apache.sshd.client.future.AuthFuture;
  27 import org.apache.sshd.client.future.OpenFuture;
  28 import org.apache.sshd.client.session.ClientSessionImpl;
  29 import org.apache.sshd.common.Session;
  30 import org.apache.sshd.common.future.SshFutureListener;
  31 import org.opendaylight.netconf.client.NetconfClientSession;
  32 import org.opendaylight.netconf.client.NetconfClientSessionListener;
  33 import org.opendaylight.netconf.client.NetconfClientSessionNegotiatorFactory;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 class CallHomeSessionContext implements CallHomeProtocolSessionContext {
  38
  39     private static final Logger LOG = LoggerFactory.getLogger(CallHomeSessionContext.class);
  40     static final Session.AttributeKey<CallHomeSessionContext> SESSION_KEY = new Session.AttributeKey<>();
  41
  42     private static final String NETCONF = "netconf";
  43
  44     private final ClientSessionImpl sshSession;
  45     private final CallHomeAuthorization authorization;
  46     private final Factory factory;
  47
  48     private volatile MinaSshNettyChannel nettyChannel = null;
  49     private volatile boolean activated;
  50
  51     private InetSocketAddress remoteAddress;
  52     private PublicKey serverKey;
  53
  54     CallHomeSessionContext(ClientSession sshSession, CallHomeAuthorization authorization, SocketAddress remoteAddress,
  55             Factory factory) {
  56         this.authorization = Preconditions.checkNotNull(authorization, "authorization");
  57         Preconditions.checkArgument(this.authorization.isServerAllowed(), "Server was not allowed.");
  58         Preconditions.checkArgument(sshSession instanceof ClientSessionImpl,
  59                 "sshSession must implement ClientSessionImpl");
  60         this.factory = Preconditions.checkNotNull(factory, "factory");
  61         this.sshSession = (ClientSessionImpl) sshSession;
  62         this.sshSession.setAttribute(SESSION_KEY, this);
  63         this.remoteAddress = (InetSocketAddress) this.sshSession.getIoSession().getRemoteAddress();
  64         this.serverKey = this.sshSession.getKex().getServerKey();
  65     }
  66
  67     static CallHomeSessionContext getFrom(ClientSession sshSession) {
  68         return sshSession.getAttribute(SESSION_KEY);
  69     }
  70
  71     AuthFuture authorize() throws IOException {
  72         authorization.applyTo(sshSession);
  73         return sshSession.auth();
  74     }
  75
  76     void openNetconfChannel() {
  77         LOG.debug("Opening NETCONF Subsystem on {}", sshSession);
  78         try {
  79             final ClientChannel netconfChannel = sshSession.createSubsystemChannel(NETCONF);
  80             netconfChannel.setStreaming(ClientChannel.Streaming.Async);
  81             netconfChannel.open().addListener(newSshFutureListener(netconfChannel));
  82         } catch (IOException e) {
  83             throw Throwables.propagate(e);
  84         }
  85     }
  86
  87     SshFutureListener<OpenFuture> newSshFutureListener(final ClientChannel netconfChannel) {
  88         return future ->
  89         {
  90             if (future.isOpened()) {
  91                 netconfChannelOpened(netconfChannel);
  92             } else {
  93                 channelOpenFailed(future.getException());
  94             }
  95         };
  96     }
  97
  98     private void channelOpenFailed(Throwable e) {
  99         LOG.error("Unable to open netconf subsystem, disconnecting.", e);
 100         sshSession.close(false);
 101     }
 102
 103     private void netconfChannelOpened(ClientChannel netconfChannel) {
 104         nettyChannel = newMinaSshNettyChannel(netconfChannel);
 105         factory.getChannelOpenListener().onNetconfSubsystemOpened(CallHomeSessionContext.this,
 106             listener -> doActivate(listener));
 107     }
 108
 109     @GuardedBy("this")
 110     private synchronized Promise<NetconfClientSession> doActivate(NetconfClientSessionListener listener) {
 111         if(activated) {
 112             return newSessionPromise().setFailure(new IllegalStateException("Session already activated."));
 113         }
 114         activated = true;
 115         LOG.info("Activating Netconf channel for {} with {}", getRemoteAddress(), listener);
 116         Promise<NetconfClientSession> activationPromise = newSessionPromise();
 117         factory.getChannelInitializer(listener).initialize(nettyChannel, activationPromise);
 118         factory.getNettyGroup().register(nettyChannel).awaitUninterruptibly(500);
 119         return activationPromise;
 120     }
 121
 122     protected MinaSshNettyChannel newMinaSshNettyChannel(ClientChannel netconfChannel) {
 123         return new MinaSshNettyChannel(this, sshSession, netconfChannel);
 124     }
 125
 126     private Promise<NetconfClientSession> newSessionPromise() {
 127         return GlobalEventExecutor.INSTANCE.newPromise();
 128     }
 129
 130     @Override
 131     public PublicKey getRemoteServerKey() {
 132         return serverKey;
 133     }
 134
 135     @Override
 136     public String getRemoteServerVersion() {
 137         return sshSession.getServerVersion();
 138     }
 139
 140     @Override
 141     public InetSocketAddress getRemoteAddress() {
 142         return remoteAddress;
 143     }
 144
 145     @Override
 146     public String getSessionName() {
 147         return authorization.getSessionName();
 148     }
 149
 150     void removeSelf() {
 151         factory.remove(this);
 152     }
 153
 154     static class Factory {
 155
 156         private final EventLoopGroup nettyGroup;
 157         private final NetconfClientSessionNegotiatorFactory negotiatorFactory;
 158         private final CallHomeNetconfSubsystemListener subsystemListener;
 159         private final ConcurrentMap<String, CallHomeSessionContext> sessions = new ConcurrentHashMap<>();
 160
 161         Factory(EventLoopGroup nettyGroup, NetconfClientSessionNegotiatorFactory negotiatorFactory,
 162                 CallHomeNetconfSubsystemListener subsystemListener) {
 163             this.nettyGroup = Preconditions.checkNotNull(nettyGroup, "nettyGroup");
 164             this.negotiatorFactory = Preconditions.checkNotNull(negotiatorFactory, "negotiatorFactory");
 165             this.subsystemListener = Preconditions.checkNotNull(subsystemListener);
 166         }
 167
 168         void remove(CallHomeSessionContext session) {
 169             sessions.remove(session.getSessionName(), session);
 170         }
 171
 172         ReverseSshChannelInitializer getChannelInitializer(NetconfClientSessionListener listener) {
 173             return ReverseSshChannelInitializer.create(negotiatorFactory, listener);
 174         }
 175
 176         CallHomeNetconfSubsystemListener getChannelOpenListener() {
 177             return this.subsystemListener;
 178         }
 179
 180         @Nullable
 181         CallHomeSessionContext createIfNotExists(ClientSession sshSession, CallHomeAuthorization authorization,
 182                 SocketAddress remoteAddress) {
 183             CallHomeSessionContext session = new CallHomeSessionContext(sshSession, authorization, remoteAddress, this);
 184             CallHomeSessionContext preexisting = sessions.putIfAbsent(session.getSessionName(), session);
 185             // If preexisting is null - session does not exist, so we can safely create new one, otherwise we return
 186             // null and incoming connection will be rejected.
 187             return preexisting == null ? session : null;
 188         }
 189
 190         EventLoopGroup getNettyGroup() {
 191             return nettyGroup;
 192         }
 193
 194     }
 195
 196 }