ip/Ping.java

   1
   2 package org.de.metux.ip;
   3
   4 import org.de.metux.util.Exec;
   5 import org.de.metux.util.ShellEscape;
   6
   7 public class Ping
   8 {
   9     String  hostname;
  10     int     max = 5;
  11     Exec    exec;
  12     boolean alive;
  13
  14     private class callback implements Exec.IExecCallback
  15     {
  16         public void OutputLine(String line)
  17         {
  18             line = line.trim();
  19
  20             if (line.startsWith("PING "))
  21             {
  22                 line = line.substring(5);
  23 //              System.err.println(" --> PING HEAD: "+line);
  24                 int x = line.indexOf(" ");
  25             }
  26             else if (line.indexOf(" octets from ")>0)
  27             {
  28 //              System.out.println("PING REPLY: "+line);
  29                 alive = true;
  30                 exec.abort();
  31             }
  32             else if (line.indexOf("ping statistics")>0);
  33             else if (line.indexOf("packets transmitted")>0);
  34             else if (line.equals(""));
  35             else
  36                 System.out.println(">>"+line);
  37         }
  38
  39         public void ErrorLine(String line)
  40         {
  41             System.err.println("!> "+line);
  42         }
  43
  44         public void debug(String line)
  45         {
  46         }
  47
  48         public void error(String line)
  49         {
  50             System.err.println("EXEC ERROR: "+line);
  51         }
  52     }
  53
  54     public Ping(String my_hostname)
  55     {
  56         hostname = my_hostname;
  57     }
  58
  59     public boolean tryHostAlive()
  60     {
  61         exec = new Exec(new callback());
  62         exec.run("ping -c "+max+" "+ShellEscape.quoting(hostname));
  63         return alive;
  64     }
  65 }