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