Interface handler

cmd/sniproxy/server.go:260–266

}

type handler interface {
	// Handle handles the given socket.
	Handle(c net.Conn)

	// ReachableOn returns the IP addresses this handler is reachable on.
	ReachableOn() []netip.Addr
}

func installDNATHandler(d *appctype.DNATConfig, out *connector) {
	// These handlers don't actually do DNAT, they just