Re: Receiving and setting TERM env

[Jakub Jelen <jjelen@xxxxxxxxxx>]

On 4/13/23 21:37, Jose David Bravo A wrote:
> Hello,
>
> I implemented an SSH server using the example in ssh_server.c as a base.
>
> In the exec_pty function, I'm executing another program that uses ncurses.
>
> I believe I need to pass the client's TERM environment variable to the 
> PTY allocated to that client so that the ncurses program knows how to 
> display itself properly. Am I correct?
>
> How can I receive the TERM environment variable sent by the client and 
> set it in the allocated PTY?

Correct. As you can see in the SSH specification, the TERM environment 
variable is passed as part of the SSH_MSG_CHANNEL_REQUEST of type 
"pty-req" so in your code you should find it in your ssh_message 
structure when you handle this message under msg->channel_request.TERM.

https://www.rfc-editor.org/rfc/rfc4254#section-6.2

Regards,
--
Jakub Jelen
Crypto Team, Security Engineering
Red Hat, Inc.