When I execute the code below with broadcast address as parameter (127.255.255.255 for instance) I have the following exception:
java.io.IOException: send failed: Permission denied
at java.net.PlainDatagramSocketImpl.send(Native Method)
at java.net.DatagramSocket.send(Unknown Source)
at Test.main(Test.java:25)
at Test.main(Test.java:11)
at java.lang.reflect.Method.invoke0(Native Method)
at java.lang.reflect.Method.invoke(Unknown Source)
at wonka.vm.Init.main(Unknown Source)
It does not occur with non-broadcast addresses, and it works fine on Sun jvm, whatever the address.
import java.io.*;
import java.net.*;
public class Test {
public static void main(String[] args){
int port = 2010;
String addr = "127.255.255.255";
if(args.length == 2){
port = Integer.parseInt(args[1]);
}
if(args.length > 0){
addr = args[0];
}
try{
DatagramSocket socket = new DatagramSocket(port);
InetAddress address = InetAddress.getByName(addr);
byte[] buf = {0, 0, 0, 0, 0};
DatagramPacket packet = new DatagramPacket(buf, buf.length, address, port);
socket.send(packet);
socket.close();
} catch (Exception e){
e.printStackTrace();
}
}
}
