com.buaa.cfs.nfs3.PrivilegedNfsGatewayStarter.java Source code

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Here is the source code for com.buaa.cfs.nfs3.PrivilegedNfsGatewayStarter.java

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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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.buaa.cfs.nfs3;

import com.buaa.cfs.conf.NfsConfigKeys;
import com.buaa.cfs.conf.NfsConfiguration;
import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;

import java.net.DatagramSocket;
import java.net.InetSocketAddress;

/**
 * This class is used to allow the initial registration of the NFS gateway with the system portmap daemon to come from a
 * privileged (&lt; 1024) port. This is necessary on certain operating systems to work around this bug in rpcbind:
 * <p>
 * Red Hat: https://bugzilla.redhat.com/show_bug.cgi?id=731542 SLES: https://bugzilla.novell.com/show_bug.cgi?id=823364
 * Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594880
 */
public class PrivilegedNfsGatewayStarter implements Daemon {

    private String[] args = null;
    private DatagramSocket registrationSocket = null;

    @Override
    public void init(DaemonContext context) throws Exception {
        System.err.println("Initializing privileged NFS client socket...");
        NfsConfiguration conf = new NfsConfiguration();
        int clientPort = conf.getInt(NfsConfigKeys.DFS_NFS_REGISTRATION_PORT_KEY,
                NfsConfigKeys.DFS_NFS_REGISTRATION_PORT_DEFAULT);
        if (clientPort < 1 || clientPort > 1023) {
            throw new RuntimeException("Must start privileged NFS server with '"
                    + NfsConfigKeys.DFS_NFS_REGISTRATION_PORT_KEY + "' configured to a " + "privileged port.");
        }
        registrationSocket = new DatagramSocket(new InetSocketAddress("localhost", clientPort));
        registrationSocket.setReuseAddress(true);
        args = context.getArguments();
    }

    @Override
    public void start() throws Exception {
        Nfs3.startService(args, registrationSocket);
    }

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

    @Override
    public void destroy() {
        if (registrationSocket != null && !registrationSocket.isClosed()) {
            registrationSocket.close();
        }
    }

}