util/IPTools.java

   1
   2 package org.de.metux.util;
   3
   4 import java.net.InetAddress;
   5 import java.net.UnknownHostException;
   6
   7 import org.xbill.DNS.Lookup;
   8 import org.xbill.DNS.SimpleResolver;
   9 import org.xbill.DNS.Record;
  10 import org.xbill.DNS.ARecord;
  11 import org.xbill.DNS.Type;
  12
  13 public class IPTools
  14 {
  15     static public InetAddress getIP(String hostname, String server)
  16     {
  17         try
  18         {
  19             Lookup l = new Lookup(hostname,Type.A);
  20             if (server!=null)
  21                 l.setResolver(new SimpleResolver(server));
  22
  23             l.run();
  24             if (l.getResult()==Lookup.SUCCESSFUL)
  25             {
  26                 Record res[] = l.getAnswers();
  27                 for (int x=0; x<res.length; x++)
  28                 {
  29                     ARecord arec = (ARecord)res[x];
  30                     return arec.getAddress();
  31                 }
  32             }
  33             else
  34                 return null;
  35         }
  36         catch (Exception e)
  37         {
  38             System.err.println("getIP() error: "+e);
  39             return null;
  40         }
  41
  42         return null;
  43     }
  44
  45     static public InetAddress IPtoInetAddress(String ip)
  46     {
  47         try
  48         {
  49             InetAddress addr = InetAddress.getByName(ip);
  50             return addr;
  51         }
  52         catch(Exception ex)
  53         {
  54             System.err.println("EX: "+ex);
  55             return null;
  56         }
  57     }
  58
  59     static public InetAddress getInterfaceAddress(String ifname)
  60     {
  61         Exec e = new Exec();
  62
  63         // FIMXE !!!
  64         String res = e.run_catch("/sbin/ifconfig "+ifname+" | grep \"inet addr\"");
  65         if (res==null)
  66             return null;
  67
  68         int pos_addr = res.indexOf("inet addr:");
  69         int pos_mask = res.indexOf(" ",pos_addr+11);
  70
  71         String text_addr = res.substring(pos_addr+10,pos_mask).trim();
  72
  73         return IPtoInetAddress(text_addr);
  74     }
  75 }