udpsocket-get-port.patch

--- ip/UdpSocket.h	2014-01-04 16:45:36.000000000 -0500
+++ ip/UdpSocket.h	2014-01-04 16:49:25.000000000 -0500
@@ -126,6 +126,8 @@
 	bool IsBound() const;
 
     std::size_t ReceiveFrom( IpEndpointName& remoteEndpoint, char *data, std::size_t size );
+
+	int Port() const;
 };
 
 
--- ip/posix/UdpSocket.cpp	2014-01-04 16:45:36.000000000 -0500
+++ ip/posix/UdpSocket.cpp	2014-01-04 16:48:44.000000000 -0500
@@ -246,6 +246,17 @@
 		return (std::size_t)result;
 	}
 
+	int Port() const
+	{
+		struct sockaddr_in sockAddr;
+		std::memset( (char *)&sockAddr, 0, sizeof(sockAddr ) );
+		socklen_t length = sizeof(sockAddr);
+		if (getsockname(socket_, (struct sockaddr *)&sockAddr, &length) < 0) {
+			throw std::runtime_error("unable to getsockname\n");
+		}
+		return ntohs(sockAddr.sin_port);
+	}
+
 	int Socket() { return socket_; }
 };
 
@@ -304,6 +315,11 @@
 	return impl_->ReceiveFrom( remoteEndpoint, data, size );
 }
 
+int UdpSocket::Port() const
+{
+	return impl_->Port();
+}
+
 
 struct AttachedTimerListener{
 	AttachedTimerListener( int id, int p, TimerListener *tl )