From: TJ <hacker@iam.tj>
Date: Mon, 4 May 2015 15:27:29 +0000 (+0100)
Subject: NetworkServerUDP: get actual ephemeral socket address
X-Git-Url: https://iam.tj/gitweb/gitweb.cgi?p=WeStealzYourDataz.git;a=commitdiff_plain;h=7bf592f48032770fbc09cd3e55782a7f13ccc1e1

NetworkServerUDP: get actual ephemeral socket address

During construction of a service requesting an ephemeral port
ensure the services' internal SocketAddress reflects the actual
port allocated by the operating system.
---

diff --git a/src/uk/ac/ntu/n0521366/wsyd/libs/net/NetworkServerUDP.java b/src/uk/ac/ntu/n0521366/wsyd/libs/net/NetworkServerUDP.java
index b514fa8..a6f3fcc 100644
--- a/src/uk/ac/ntu/n0521366/wsyd/libs/net/NetworkServerUDP.java
+++ b/src/uk/ac/ntu/n0521366/wsyd/libs/net/NetworkServerUDP.java
@@ -104,7 +104,14 @@ public class NetworkServerUDP extends NetworkServerAbstract {
     @Override
     public  void serverOpen() throws SocketException {
         _datagramSocket = new DatagramSocket(_socketAddress.getPort(), _socketAddress.getAddress());
-        _datagramSocket.setSoTimeout(100); // 1/10th second blocking timeout on receive() 
+        _datagramSocket.setSoTimeout(100); // 1/10th second blocking timeout on receive()
+
+        if (_socketAddress.getPort() == Network.PORTS_EPHEMERAL) {
+            // reflect the actual port in use if an ephermal port was requested
+            InetSocketAddress actualSA = (InetSocketAddress)_datagramSocket.getLocalSocketAddress();
+            _socketAddress.setAddress(actualSA.getAddress());
+            _socketAddress.setPort(actualSA.getPort());
+        }
     }
     
     /**