/**
* 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.hadoop.hdfs.server.datanode;
import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_SECURITY_AUTHENTICATION;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.channels.ServerSocketChannel;
import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.common.HdfsConstants;
import org.apache.hadoop.http.HttpServer;
import org.mortbay.jetty.nio.SelectChannelConnector;
/**
* Utility class to start a datanode in a secure cluster, first obtaining
* privileged resources before main startup and handing them to the datanode.
*/
public class SecureDataNodeStarter implements Daemon {
/**
* Stash necessary resources needed for datanode operation in a secure env.
*/
public static class SecureResources {
private final ServerSocket streamingSocket;
private final SelectChannelConnector listener;
public SecureResources(ServerSocket streamingSocket,
SelectChannelConnector listener) {
this.streamingSocket = streamingSocket;
this.listener = listener;
}
public ServerSocket getStreamingSocket() { return streamingSocket; }
public SelectChannelConnector getListener() { return listener; }
}
private String [] args;
private SecureResources resources;
@Override
public void init(DaemonContext context) throws Exception {
System.err.println("Initializing secure datanode resources");
Configuration conf = new Configuration();
// Stash command-line arguments for regular datanode
args = context.getArguments();
// Obtain secure port for data streaming to datanode
InetSocketAddress socAddr = DataNode.getStreamingAddr(conf);
int socketWriteTimeout = conf.getInt("dfs.datanode.socket.write.timeout",
HdfsConstants.WRITE_TIMEOUT);
ServerSocket ss = (socketWriteTimeout > 0) ?
ServerSocketChannel.open().socket() : new ServerSocket();
ss.bind(socAddr, 0);
// Check that we got the port we need
if(ss.getLocalPort() != socAddr.getPort())
throw new RuntimeException("Unable to bind on specified streaming port in secure " +
"context. Needed " + socAddr.getPort() + ", got " + ss.getLocalPort());
// Obtain secure listener for web server
SelectChannelConnector listener =
(SelectChannelConnector)HttpServer.createDefaultChannelConnector();
InetSocketAddress infoSocAddr = DataNode.getInfoAddr(conf);
listener.setHost(infoSocAddr.getHostName());
listener.setPort(infoSocAddr.getPort());
// Open listener here in order to bind to port as root
listener.open();
if(listener.getPort() != infoSocAddr.getPort())
throw new RuntimeException("Unable to bind on specified info port in secure " +
"context. Needed " + socAddr.getPort() + ", got " + ss.getLocalPort());
System.err.println("Successfully obtained privileged resources (streaming port = "
+ ss + " ) (http listener port = " + listener.getConnection() +")");
if(ss.getLocalPort() >= 1023 || listener.getPort() >= 1023)
System.err.println("Warning: Starting secure datanode with unprivileged ports");
resources = new SecureResources(ss, listener);
}
@Override
public void start() throws Exception {
System.err.println("Starting regular datanode initialization");
DataNode.secureMain(args, resources);
}
@Override public void destroy() { /* Nothing to do */ }
@Override public void stop() throws Exception { /* Nothing to do */ }
}