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 examples;
019
020import java.io.IOException;
021import org.apache.commons.net.bsd.RExecClient;
022
023/***
024 * This is an example program demonstrating how to use the RExecClient class.
025 * This program connects to an rexec server and requests that the
026 * given command be executed on the server.  It then reads input from stdin
027 * (this will be line buffered on most systems, so don't expect character
028 * at a time interactivity), passing it to the remote process and writes
029 * the process stdout and stderr to local stdout.
030 * <p>
031 * Example: java rexec myhost myusername mypassword "ps -aux"
032 * <p>
033 * Usage: rexec <hostname> <username> <password> <command>
034 * <p>
035 ***/
036
037// This class requires the IOUtil support class!
038public final class rexec
039{
040
041    public static final void main(String[] args)
042    {
043        String server, username, password, command;
044        RExecClient client;
045
046        if (args.length != 4)
047        {
048            System.err.println(
049                "Usage: rexec <hostname> <username> <password> <command>");
050            System.exit(1);
051            return ; // so compiler can do proper flow control analysis
052        }
053
054        client = new RExecClient();
055
056        server = args[0];
057        username = args[1];
058        password = args[2];
059        command = args[3];
060
061        try
062        {
063            client.connect(server);
064        }
065        catch (IOException e)
066        {
067            System.err.println("Could not connect to server.");
068            e.printStackTrace();
069            System.exit(1);
070        }
071
072        try
073        {
074            client.rexec(username, password, command);
075        }
076        catch (IOException e)
077        {
078            try
079            {
080                client.disconnect();
081            }
082            catch (IOException f)
083            {}
084            e.printStackTrace();
085            System.err.println("Could not execute command.");
086            System.exit(1);
087        }
088
089
090        IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
091                         System.in, System.out);
092
093        try
094        {
095            client.disconnect();
096        }
097        catch (IOException e)
098        {
099            e.printStackTrace();
100            System.exit(1);
101        }
102
103        System.exit(0);
104    }
105
106}
107