1  // vim: tabstop=8 shiftwidth=4 softtabstop=4 noexpandtab
 2  import java.net.InetAddress;
 3  import java.net.UnknownHostException;
 4  import java.nio.ByteBuffer;
 5  
 6  import fr.free.miniupnp.libnatpmp.NatPmp;
 7  import fr.free.miniupnp.libnatpmp.NatPmpResponse;
 8  
 9  class JavaTest {
10      public static void main(String[] args) {
11  	NatPmp natpmp = new NatPmp();
12  
13          natpmp.sendPublicAddressRequest();
14          NatPmpResponse response = new NatPmpResponse();
15  
16          int result = -1;
17          for(;;) {
18              result = natpmp.readNatPmpResponseOrRetry(response);
19  	    if (result == 0) break;
20  	    if (result != -100) { // -100 = NATPMP_TRYAGAIN
21  		String errorString = String.format("NATPMP error %d", result);
22  		throw new RuntimeException(errorString);
23  	    }
24  	    try {
25  		Thread.sleep(4000);
26  	    } catch (InterruptedException e) {
27  		//fallthrough
28  	    }
29  	}
30  
31  	byte[] bytes = intToByteArray(response.addr);
32  
33  	try {
34  	    InetAddress inetAddress = InetAddress.getByAddress(bytes);
35  	    System.out.println("Public address is " + inetAddress);
36  	} catch (UnknownHostException e) {
37  	    throw new RuntimeException(e);
38  	}
39      }
40  
41      public static final byte[] intToByteArray(int value) {
42          return new byte[] {
43              (byte)value,
44              (byte)(value >>> 8),
45              (byte)(value >>> 16),
46              (byte)(value >>> 24)};
47      }
48  }