1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.net.examples.unix;
19
20 import java.io.IOException;
21
22 import org.apache.commons.net.bsd.RExecClient;
23 import org.apache.commons.net.examples.util.IOUtil;
24
25 /**
26 * This is an example program demonstrating how to use the RExecClient class. This program connects to an rexec server and requests that the given command be
27 * executed on the server. It then reads input from stdin (this will be line buffered on most systems, so don't expect character at a time interactivity),
28 * passing it to the remote process and writes the process stdout and stderr to local stdout.
29 * <p>
30 * Example: java rexec myhost myuser mypassword "ps -aux"
31 * <p>
32 * Usage: rexec <hostname> <username> <password> <command>
33 */
34
35 // This class requires the IOUtil support class!
36 public final class rexec {
37
38 public static void main(final String[] args) {
39
40 if (args.length != 4) {
41 System.err.println("Usage: rexec <hostname> <user> <password> <command>");
42 System.exit(1);
43 return; // so compiler can do proper flow control analysis
44 }
45
46 final RExecClient client = new RExecClient();
47 final String server = args[0];
48 final String user = args[1];
49 final String password = args[2];
50 final String command = args[3];
51
52 try {
53 client.connect(server);
54 } catch (final IOException e) {
55 System.err.println("Could not connect to server.");
56 e.printStackTrace();
57 System.exit(1);
58 }
59
60 try {
61 client.rexec(user, password, command);
62 } catch (final IOException e) {
63 try {
64 client.disconnect();
65 } catch (final IOException f) {
66 /* ignored */
67 }
68 e.printStackTrace();
69 System.err.println("Could not execute command.");
70 System.exit(1);
71 }
72
73 IOUtil.readWrite(client.getInputStream(), client.getOutputStream(), System.in, System.out);
74
75 try {
76 client.disconnect();
77 } catch (final IOException e) {
78 e.printStackTrace();
79 System.exit(1);
80 }
81
82 System.exit(0);
83 }
84
85 }