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.unix; 019 020import java.io.IOException; 021import org.apache.commons.net.bsd.RLoginClient; 022 023import examples.util.IOUtil; 024 025/*** 026 * This is an example program demonstrating how to use the RLoginClient 027 * class. This program connects to an rlogin daemon and begins to 028 * interactively read input from stdin (this will be line buffered on most 029 * systems, so don't expect character at a time interactivity), passing it 030 * to the remote login process and writing the remote stdout and stderr 031 * to local stdout. If you don't have .rhosts or hosts.equiv files set up, 032 * the rlogin daemon will prompt you for a password. 033 * <p> 034 * On Unix systems you will not be able to use the rshell capability 035 * unless the process runs as root since only root can bind port addresses 036 * lower than 1024. 037 * <p> 038 * JVM's using green threads will likely have problems if the rlogin daemon 039 * requests a password. This program is merely a demonstration and is 040 * not suitable for use as an application, especially given that it relies 041 * on line buffered input from System.in. The best way to run this example 042 * is probably from a Win95 dos box into a Unix host. 043 * <p> 044 * Example: java rlogin myhost localusername remoteusername vt100 045 * <p> 046 * Usage: rlogin <hostname> <localuser> <remoteuser> <terminal> 047 ***/ 048 049// This class requires the IOUtil support class! 050public final class rlogin 051{ 052 053 public static void main(String[] args) 054 { 055 String server, localuser, remoteuser, terminal; 056 RLoginClient client; 057 058 if (args.length != 4) 059 { 060 System.err.println( 061 "Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>"); 062 System.exit(1); 063 return ; // so compiler can do proper flow control analysis 064 } 065 066 client = new RLoginClient(); 067 068 server = args[0]; 069 localuser = args[1]; 070 remoteuser = args[2]; 071 terminal = args[3]; 072 073 try 074 { 075 client.connect(server); 076 } 077 catch (IOException e) 078 { 079 System.err.println("Could not connect to server."); 080 e.printStackTrace(); 081 System.exit(1); 082 } 083 084 try 085 { 086 client.rlogin(localuser, remoteuser, terminal); 087 } 088 catch (IOException e) 089 { 090 try 091 { 092 client.disconnect(); 093 } 094 catch (IOException f) 095 {/* ignored */} 096 e.printStackTrace(); 097 System.err.println("rlogin authentication failed."); 098 System.exit(1); 099 } 100 101 102 IOUtil.readWrite(client.getInputStream(), client.getOutputStream(), 103 System.in, System.out); 104 105 try 106 { 107 client.disconnect(); 108 } 109 catch (IOException e) 110 { 111 e.printStackTrace(); 112 System.exit(1); 113 } 114 115 System.exit(0); 116 } 117 118} 119