001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.net.examples.unix;
019
020import java.io.IOException;
021import java.net.InetAddress;
022import java.time.Duration;
023
024import org.apache.commons.net.daytime.DaytimeTCPClient;
025import org.apache.commons.net.daytime.DaytimeUDPClient;
026
027/**
028 * This is an example program demonstrating how to use the DaytimeTCP and DaytimeUDP classes. This program connects to the default daytime service port of a
029 * specified server, retrieves the daytime, and prints it to standard output. The default is to use the TCP port. Use the -udp flag to use the UDP port.
030 * <p>
031 * Usage: daytime [-udp] <hostname>
032 */
033public final class daytime {
034
035    public static void daytimeTCP(final String host) throws IOException {
036        final DaytimeTCPClient client = new DaytimeTCPClient();
037
038        // We want to timeout if a response takes longer than 60 seconds
039        client.setDefaultTimeout(60000);
040        client.connect(host);
041        System.out.println(client.getTime().trim());
042        client.disconnect();
043    }
044
045    public static void daytimeUDP(final String host) throws IOException {
046        try (DaytimeUDPClient client = new DaytimeUDPClient()) {
047
048            // We want to timeout if a response takes longer than 60 seconds
049            client.setDefaultTimeout(Duration.ofSeconds(60));
050            client.open();
051            System.out.println(client.getTime(InetAddress.getByName(host)).trim());
052        }
053    }
054
055    public static void main(final String[] args) {
056
057        if (args.length == 1) {
058            try {
059                daytimeTCP(args[0]);
060            } catch (final IOException e) {
061                e.printStackTrace();
062                System.exit(1);
063            }
064        } else if (args.length == 2 && args[0].equals("-udp")) {
065            try {
066                daytimeUDP(args[1]);
067            } catch (final IOException e) {
068                e.printStackTrace();
069                System.exit(1);
070            }
071        } else {
072            System.err.println("Usage: daytime [-udp] <hostname>");
073            System.exit(1);
074        }
075
076    }
077
078}