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
018 package examples;
019
020 import java.io.IOException;
021 import 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!
038 public 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