Feature proposal: ProxyUseFdpass-like behavior for a regular ssh session

[Damien Miller]

On Thu, 27 May 2021, Damien Miller wrote:

> This is basically how the multiplexing protocol works right now.
> Take a look at mux.c:mux_client_request_session() - it passes the
> stdin, stdout and stderr fds to the primary multiplexing process.
> 
> From what you describe, you couple probably use this facility with
> a custom client that spoke the simple (but undocumented) multiplexing
> protocol to do what you need.

See also the mux proxy mode that Markus added (cf portable commit 8d0578)
Which allows a client to talk to the ssh channels code pretty much
directly - it allows clients for arbitrary extension protocols to be
written without modifying OpenSSH

-d