Recording websocket messages

Question

I need to extend a HTTP recorder to record websocket traffic. HTTP recorder is in C / unix platform.

I know HTTP traffic will be through port 80 or 443, hence I am able to record it. In HTTP message a new port is communicated, and through that port websocket traffic passes through. Since this port is dynamic, and HTTP messages will be different in different cases I can not parse and get port for websocket.

I think of below logic, not sure if that is going to work. Need your suggestion / pointers in this regard.

Make use of iptables

Forward all the traffic to a different port (where my application is listening) using iptable rules

Then my application should receive the data (hope it is possible)

Then my application should receive the destination information (when data is forwarded from iptables to my application, can I get actual destination ip/port).

Assuming, I get actual ip/port, then from my application, I can send data to actual destination.

I know, its a long way to go, will this approach work.