Adding a fd that is not obtained through accept to the list the active connections

[Maxim Dounin]

Hello!

On Fri, Aug 27, 2021 at 01:59:03PM +0200, Ottavio Campana wrote:

> Dear Phillip,
> 
> I know Tailscale very well, I use it and like it a lot. But my final goal
> is finding a way to implement the ONVIF Uplink service,
> https://www.onvif.org/specs/srv/uplink/ONVIF-Uplink-Spec.pdf , where I can
> have several devices on the LAN that need to connect to a remote server,
> which will then send commands.
> 
> Therefore I need a way to start a connection from nginx (or an external
> program and then passing the fd through a unix socket domain) and make it
> act as if the fd were obtained from an accept.
> 
> Nginx works with events and I find it very difficult to find a mechanism to
> pass this connection to it.
> 
> Do you have other ideas?

The most simple solution I can think of is to open two 
connections: to your command endpoint and to nginx, and proxy 
everything once the connections are established.

-- 
Maxim Dounin
http://mdounin.ru/