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.unix; 019 020 import java.io.IOException; 021 import org.apache.commons.net.bsd.RExecClient; 022 023 import examples.util.IOUtil; 024 025 /*** 026 * This is an example program demonstrating how to use the RExecClient class. 027 * This program connects to an rexec server and requests that the 028 * given command be executed on the server. It then reads input from stdin 029 * (this will be line buffered on most systems, so don't expect character 030 * at a time interactivity), passing it to the remote process and writes 031 * the process stdout and stderr to local stdout. 032 * <p> 033 * Example: java rexec myhost myusername mypassword "ps -aux" 034 * <p> 035 * Usage: rexec <hostname> <username> <password> <command> 036 * <p> 037 ***/ 038 039 // This class requires the IOUtil support class! 040 public final class rexec 041 { 042 043 public static final void main(String[] args) 044 { 045 String server, username, password, command; 046 RExecClient client; 047 048 if (args.length != 4) 049 { 050 System.err.println( 051 "Usage: rexec <hostname> <username> <password> <command>"); 052 System.exit(1); 053 return ; // so compiler can do proper flow control analysis 054 } 055 056 client = new RExecClient(); 057 058 server = args[0]; 059 username = args[1]; 060 password = args[2]; 061 command = args[3]; 062 063 try 064 { 065 client.connect(server); 066 } 067 catch (IOException e) 068 { 069 System.err.println("Could not connect to server."); 070 e.printStackTrace(); 071 System.exit(1); 072 } 073 074 try 075 { 076 client.rexec(username, password, command); 077 } 078 catch (IOException e) 079 { 080 try 081 { 082 client.disconnect(); 083 } 084 catch (IOException f) 085 {} 086 e.printStackTrace(); 087 System.err.println("Could not execute command."); 088 System.exit(1); 089 } 090 091 092 IOUtil.readWrite(client.getInputStream(), client.getOutputStream(), 093 System.in, System.out); 094 095 try 096 { 097 client.disconnect(); 098 } 099 catch (IOException e) 100 { 101 e.printStackTrace(); 102 System.exit(1); 103 } 104 105 System.exit(0); 106 } 107 108 } 109