API for inbound proxy

[eldondev]

Typically meadtap would be run in an externally-facing network context, and leverage some kind of a tap device that resides in an inward-facing network namespace to serve as the gateway. It would be nice if it were possible to open ports in the externally-facing network context, and proxy them to locations in the inward-facing network context. Building an api that would cause meadtap to listen on external ports and forward them. Main implements a PoC of this in serve_local here, but that is static and nonsensical for anything outside of the test environment:

meadinthemiddle/meadtap/main.go

Line 218 in c4a6b83

func serve_local(s *stack.Stack) {