/* 
    P/P   *  Method: com.dmdirc.addons.dns.DNSPlugin__static_init
          */
     1  /*
     2   * Copyright (c) 2006-2009 Chris Smith, Shane Mc Cormack, Gregory Holmes
     3   *
     4   * Permission is hereby granted, free of charge, to any person obtaining a copy
     5   * of this software and associated documentation files (the "Software"), to deal
     6   * in the Software without restriction, including without limitation the rights
     7   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   * copies of the Software, and to permit persons to whom the Software is
     9   * furnished to do so, subject to the following conditions:
    10   *
    11   * The above copyright notice and this permission notice shall be included in
    12   * all copies or substantial portions of the Software.
    13   *
    14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   * SOFTWARE.
    21   */
    22  
    23  package com.dmdirc.addons.dns;
    24  
    25  import com.dmdirc.commandparser.CommandManager;
    26  import com.dmdirc.plugins.Plugin;
    27  
    28  import java.net.InetAddress;
    29  import java.net.UnknownHostException;
    30  
    31  import java.util.ArrayList;
    32  import java.util.List;
    33  
    34  /**
    35   * DNS plugin.
    36   */
    37  public final class DNSPlugin extends Plugin {
    38      
    39      /** The DNSCommand we've registered. */
    40      private DNSCommand command;
    41      
    42      /** Creates a new instance of DNSPlugin. */
    43      public DNSPlugin() {
                 /* 
    P/P           *  Method: void com.dmdirc.addons.dns.DNSPlugin()
                  */
    44          super();
    45      }
    46      
    47      /** {@inheritDoc} */
    48      @Override
    49      public void onLoad() {
                 /* 
    P/P           *  Method: void onLoad()
                  * 
                  *  Postconditions:
                  *    this.command == &new DNSCommand(onLoad#1)
                  *    new DNSCommand(onLoad#1) num objects == 1
                  */
    50          command = new DNSCommand();
    51      }
    52      
    53      /** {@inheritDoc} */
    54      @Override
    55      public void onUnload() {
                 /* 
    P/P           *  Method: void onUnload()
                  * 
                  *  Preconditions:
                  *    init'ed(this.command)
                  */
    56          CommandManager.unregisterCommand(command);
    57      }
    58      
    59      /**
    60       * Returns the IP(s) for a hostname.
    61       *
    62       * @param hostname Hostname to resolve.
    63       *
    64       * @return Resolved IP(s)
    65       */
    66      public static String getIPs(final String hostname) {
                 /* 
    P/P           *  Method: String getIPs(String)
                  * 
                  *  Presumptions:
                  *    arr$.length@70 <= 232-1
                  *    arr$[i$]@70 != null
                  *    java.net.InetAddress:getAllByName(...)@70 != null
                  * 
                  *  Postconditions:
                  *    java.lang.Object:toString(...)._tainted == 0
                  *    return_value == &amp;java.lang.Object:toString(...)
                  */
    67          List<String> results = new ArrayList<String>();
    68          
    69          try {
    70              final InetAddress[] ips = InetAddress.getAllByName(hostname);
    71              
    72              for (InetAddress ip : ips) {
    73                  results.add(ip.getHostAddress());
    74              }
    75              
    76          } catch (UnknownHostException ex) {
    77              results = new ArrayList<String>();
    78          }
    79          
    80          return results.toString();
    81      }
    82      
    83      /**
    84       * Returns the hostname for an ip.
    85       *
    86       * @param ip IP to resolve
    87       *
    88       * @return Resolved hostname
    89       */
    90      public static String getHostname(final String ip) {
    91          try {
                     /* 
    P/P               *  Method: String getHostname(String)
                      * 
                      *  Presumptions:
                      *    java.net.InetAddress:getByName(...)@92 != null
                      * 
                      *  Postconditions:
                      *    init'ed(return_value)
                      */
    92              return InetAddress.getByName(ip).getHostName();
    93          } catch (UnknownHostException ex) {
    94              return "";
    95          }
    96      }
    97      
    98  }