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    1   /*
    2    * Copyright 2001-2005 The Apache Software Foundation
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package examples;
    17
    18  import java.io.IOException;
    19  import java.net.InetAddress;
    20  import java.net.UnknownHostException;
    21  import org.apache.commons.net.FingerClient;
    22
    23  /****
    24   * This is an example of how you would implement the finger command
    25   * in Java using NetComponents.  The Java version is much shorter.
    26   * But keep in mind that the Unix finger command reads all sorts of
    27   * local files to output local finger information.  This program only
    28   * queries the finger daemon.
    29   * <p>
    30   * The -l flag is used to request long output from the server.
    31   * <p>
    32   ***/
    33  public final class finger
    34  {
    35
    36      public static final void main(String[] args)
    37      {
    38          boolean longOutput = false;
    39          int arg = 0, index;
    40          String handle, host;
    41          FingerClient finger;
    42          InetAddress address = null;
    43
    44          // Get flags.  If an invalid flag is present, exit with usage message.
    45          while (arg < args.length && args[arg].startsWith("-"))
    46          {
    47              if (args[arg].equals("-l"))
    48                  longOutput = true;
    49              else
    50              {
    51                  System.err.println("usage: finger [-l] [[[handle][@<server>]] ...]");
    52                  System.exit(1);
    53              }
    54              ++arg;
    55          }
    56
    57
    58          finger = new FingerClient();
    59          // We want to timeout if a response takes longer than 60 seconds
    60          finger.setDefaultTimeout(60000);
    61
    62          if (arg >= args.length)
    63          {
    64              // Finger local host
    65
    66              try
    67              {
    68                  address = InetAddress.getLocalHost();
    69              }
    70              catch (UnknownHostException e)
    71              {
    72                  System.err.println("Error unknown host: " + e.getMessage());
    73                  System.exit(1);
    74              }
    75
    76              try
    77              {
    78                  finger.connect(address);
    79                  System.out.print(finger.query(longOutput));
    80                  finger.disconnect();
    81              }
    82              catch (IOException e)
    83              {
    84                  System.err.println("Error I/O exception: " + e.getMessage());
    85                  System.exit(1);
    86              }
    87
    88              return ;
    89          }
    90
    91          // Finger each argument
    92          while (arg < args.length)
    93          {
    94
    95              index = args[arg].lastIndexOf("@");
    96
    97              if (index == -1)
    98              {
    99                  handle = args[arg];
    100                 try
    101                 {
    102                     address = InetAddress.getLocalHost();
    103                 }
    104                 catch (UnknownHostException e)
    105                 {
    106                     System.err.println("Error unknown host: " + e.getMessage());
    107                     System.exit(1);
    108                 }
    109             }
    110             else
    111             {
    112                 handle = args[arg].substring(0, index);
    113                 host = args[arg].substring(index + 1);
    114
    115                 try
    116                 {
    117                     address = InetAddress.getByName(host);
    118                 }
    119                 catch (UnknownHostException e)
    120                 {
    121                     System.err.println("Error unknown host: " + e.getMessage());
    122                     System.exit(1);
    123                 }
    124             }
    125
    126             System.out.println("[" + address.getHostName() + "]");
    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