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 java.net.InetAddress; 022import java.net.UnknownHostException; 023 024import org.apache.commons.net.finger.FingerClient; 025 026/*** 027 * This is an example of how you would implement the finger command 028 * in Java using NetComponents. The Java version is much shorter. 029 * But keep in mind that the Unix finger command reads all sorts of 030 * local files to output local finger information. This program only 031 * queries the finger daemon. 032 * <p> 033 * The -l flag is used to request long output from the server. 034 ***/ 035public final class finger 036{ 037 038 public static void main(String[] args) 039 { 040 boolean longOutput = false; 041 int arg = 0, index; 042 String handle, host; 043 FingerClient finger; 044 InetAddress address = null; 045 046 // Get flags. If an invalid flag is present, exit with usage message. 047 while (arg < args.length && args[arg].startsWith("-")) 048 { 049 if (args[arg].equals("-l")) { 050 longOutput = true; 051 } else { 052 System.err.println("usage: finger [-l] [[[handle][@<server>]] ...]"); 053 System.exit(1); 054 } 055 ++arg; 056 } 057 058 059 finger = new FingerClient(); 060 // We want to timeout if a response takes longer than 60 seconds 061 finger.setDefaultTimeout(60000); 062 063 if (arg >= args.length) 064 { 065 // Finger local host 066 067 try 068 { 069 address = InetAddress.getLocalHost(); 070 } 071 catch (UnknownHostException e) 072 { 073 System.err.println("Error unknown host: " + e.getMessage()); 074 System.exit(1); 075 } 076 077 try 078 { 079 finger.connect(address); 080 System.out.print(finger.query(longOutput)); 081 finger.disconnect(); 082 } 083 catch (IOException e) 084 { 085 System.err.println("Error I/O exception: " + e.getMessage()); 086 System.exit(1); 087 } 088 089 return ; 090 } 091 092 // Finger each argument 093 while (arg < args.length) 094 { 095 096 index = args[arg].lastIndexOf("@"); 097 098 if (index == -1) 099 { 100 handle = args[arg]; 101 try 102 { 103 address = InetAddress.getLocalHost(); 104 } 105 catch (UnknownHostException e) 106 { 107 System.err.println("Error unknown host: " + e.getMessage()); 108 System.exit(1); 109 } 110 } 111 else 112 { 113 handle = args[arg].substring(0, index); 114 host = args[arg].substring(index + 1); 115 116 try 117 { 118 address = InetAddress.getByName(host); 119 System.out.println("[" + address.getHostName() + "]"); 120 } 121 catch (UnknownHostException e) 122 { 123 System.err.println("Error unknown host: " + e.getMessage()); 124 System.exit(1); 125 } 126 } 127 128 try 129 { 130 finger.connect(address); 131 System.out.print(finger.query(longOutput, handle)); 132 finger.disconnect(); 133 } 134 catch (IOException e) 135 { 136 System.err.println("Error I/O exception: " + e.getMessage()); 137 System.exit(1); 138 } 139 140 ++arg; 141 if (arg != args.length) { 142 System.out.print("\n"); 143 } 144 } 145 } 146} 147