Get mac from client

Question

I am trying to collect a building's mac addresses, and I have created a web application using Vaadin 6(the application has other features so I have to stick with vaadin).

The problem is, I want my user to only insert his name, and for me to get his mac address automatically, but the problem is I don't know how to do it.

I was using

ip = InetAddress.getLocalHost();
mac = ip.getHostAddress();

The problem is that this code returns me my own servers ip and mac.

So the question is, how can I get the client's mac address??

Also if i can get the local ip that is so much better, but first I need the mac.

Any help is very much appreciated.

Answer 1

IP address of the client in a servlet you can get so -

HttpServletRequest httpServletRequest = (HttpServletRequest) request;

// Proxy
String userIpAddress = httpServletRequest.getHeader("X-Forwarded-For");

if(userIpAddress == null) {
   userIpAddress = request.getRemoteAddr();
}

In Vaadin there are class WebBrowser , you can use it -

WebBrowser browser = (WebBrowser) getWindow().getTerminal();
String userIpAddress = browser.getAddress();

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MAC address of sender changing as many times as times the frame passes through routers and you will always receive the MAC address of the network gateway.