Name: dgC58589 Date: 01/20/98


The InetAddress returned by Socket.getLocalAddress
returns the IP address in a reverse order.
The bug is present on Solaris x86 1.1.5 and
all tested versions of the Linux JDK.
The sparc version works correctly.

Source code follows:

import java.net.*;
import java.io.*;

public
class inet
{
  public static void main(String argv[])
  {
    if (argv.length < 2)
    {
      System.err.println("Usage : java inet <host> <port>");
      System.exit(-1);
    }

    int port = 0;
    String host = argv[0];

    try
    {
      port = Integer.parseInt(argv[1]);
    }
    catch (NumberFormatException e)
    {
      System.err.println("<port> must be a number!");
      System.err.println("Usage : java inet <host> <port>");
      System.exit(-1);
    }

    try
    {
      Socket sock = new Socket(host,port);
      InetAddress in = sock.getLocalAddress();
      InetAddress in2 = InetAddress.getByName(host);

      System.out.println("Socket.getLocalAddress returns (wrong) : " + in);
      System.out.println("InetAddress.getByName returns (right) : " + in2);
    }
    catch (UnknownHostException e1)
    {
      System.err.println(e1);
      System.err.println("Usage : java inet <host> <port>");
      System.exit(-1);
    }
    catch (IOException e2)
    {
      e2.printStackTrace(System.err);
    }

  }
}
(Review ID: 23574)
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