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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.client.session;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import org.apache.sshd.client.ClientFactoryManager;
import org.apache.sshd.client.future.OpenFuture;
import org.apache.sshd.common.Channel;
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.Service;
import org.apache.sshd.common.ServiceFactory;
import org.apache.sshd.common.Session;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.SshException;
import org.apache.sshd.common.future.SshFutureListener;
import org.apache.sshd.common.session.AbstractConnectionService;
import org.apache.sshd.common.util.Buffer;
import org.apache.sshd.server.channel.OpenChannelException;
/**
* Client side <code>ssh-connection</code> service.
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class ClientConnectionService
extends AbstractConnectionService
{
public static class Factory
implements ServiceFactory
{
public String getName
() {
return "ssh-connection";
}
public Service create
(Session session
) throws IOException {
return new ClientConnectionService
(session
);
}
}
public ClientConnectionService
(Session s
) throws SshException
{
super(s
);
if (!(s
instanceof ClientSessionImpl
)) {
throw new IllegalStateException("Client side service used on server side");
}
}
@
Override
public void start
() {
if (!((ClientSessionImpl
) session
).
isAuthenticated()) {
throw new IllegalStateException("Session is not authenticated");
}
startHeartBeat
();
}
protected void startHeartBeat
() {
String intervalStr = session.
getFactoryManager().
getProperties().
get(ClientFactoryManager.
HEARTBEAT_INTERVAL);
try {
int interval = intervalStr
!=
null ? Integer.
parseInt(intervalStr
) :
0;
if (interval
> 0) {
session.
getFactoryManager().
getScheduledExecutorService().
scheduleAtFixedRate(new Runnable() {
public void run
() {
sendHeartBeat
();
}
}, interval, interval,
TimeUnit.
MILLISECONDS);
}
} catch (NumberFormatException e
) {
log.
warn("Ignoring bad heartbeat interval: {}", intervalStr
);
}
}
protected void sendHeartBeat
() {
try {
Buffer buf = session.
createBuffer(SshConstants.
SSH_MSG_GLOBAL_REQUEST);
String request = session.
getFactoryManager().
getProperties().
get(ClientFactoryManager.
HEARTBEAT_REQUEST);
if (request ==
null) {
request =
"keepalive@sshd.apache.org";
}
buf.
putString(request
);
buf.
putBoolean(false);
session.
writePacket(buf
);
} catch (IOException e
) {
log.
info("Error sending keepalive message", e
);
}
}
// TODO: remove from interface
public String initAgentForward
() throws IOException {
throw new IllegalStateException("Server side operation");
}
// TODO: remove from interface
public String createX11Display
(boolean singleConnection,
String authenticationProtocol,
String authenticationCookie,
int screen
) throws IOException {
throw new IllegalStateException("Server side operation");
}
}