/**
 * 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 java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.channels.ServerSocketChannel;
import java.security.GeneralSecurityException;

import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.http.HttpConfig;
import org.apache.hadoop.http.HttpServer;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.ssl.SSLFactory;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.security.SslSocketConnector;

import javax.net.ssl.SSLServerSocketFactory;

import com.google.common.annotations.VisibleForTesting;

/**
 * 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 Connector listener;
    public SecureResources(ServerSocket streamingSocket,
        Connector listener) {

      this.streamingSocket = streamingSocket;
      this.listener = listener;
    }

    public ServerSocket getStreamingSocket() { return streamingSocket; }

    public Connector getListener() { return listener; }
  }
  
  private String [] args;
  private SecureResources resources;
  private SSLFactory sslFactory;

  @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();
    
    sslFactory = new SSLFactory(SSLFactory.Mode.SERVER, conf);
    resources = getSecureResources(sslFactory, conf);
  }

  @Override
  public void start() throws Exception {
    System.err.println("Starting regular datanode initialization");
    DataNode.secureMain(args, resources);
  }
  
  @Override public void destroy() {
    sslFactory.destroy();
  }

  @Override public void stop() throws Exception { /* Nothing to do */ }

  @VisibleForTesting
  public static SecureResources getSecureResources(final SSLFactory sslFactory,
                                  Configuration conf) throws Exception {
    // Obtain secure port for data streaming to datanode
    InetSocketAddress streamingAddr  = DataNode.getStreamingAddr(conf);
    int socketWriteTimeout = conf.getInt(DFSConfigKeys.DFS_DATANODE_SOCKET_WRITE_TIMEOUT_KEY,
        HdfsServerConstants.WRITE_TIMEOUT);
    
    ServerSocket ss = (socketWriteTimeout > 0) ? 
        ServerSocketChannel.open().socket() : new ServerSocket();
    ss.bind(streamingAddr, 0);
    
    // Check that we got the port we need
    if (ss.getLocalPort() != streamingAddr.getPort()) {
      throw new RuntimeException("Unable to bind on specified streaming port in secure " +
          "context. Needed " + streamingAddr.getPort() + ", got " + ss.getLocalPort());
    }

    // Obtain secure listener for web server
    Connector listener;
    if (HttpConfig.isSecure()) {
      try {
        sslFactory.init();
      } catch (GeneralSecurityException ex) {
        throw new IOException(ex);
      }
      SslSocketConnector sslListener = new SslSocketConnector() {
        @Override
        protected SSLServerSocketFactory createFactory() throws Exception {
          return sslFactory.createSSLServerSocketFactory();
        }
      };
      listener = sslListener;
    } else {
      listener = 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 " + streamingAddr.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) &&
        UserGroupInformation.isSecurityEnabled()) {
      throw new RuntimeException("Cannot start secure datanode with unprivileged ports");
    }
    System.err.println("Opened streaming server at " + streamingAddr);
    System.err.println("Opened info server at " + infoSocAddr);
    return new SecureResources(ss, listener);
  }

}