Re: Receiving and setting TERM env

[Jose David Bravo A <jbravo@xxxxxxxxxxxxxxxxxxxxxx>]

Hello Jakub, 

Thanks a lot, I spent many hours yesterday looking about it. I asked it to chatgpt as well. 

Jakub 1 - ChatGPT 0. 

Jose Bravo 


De: "Jakub Jelen" <jjelen@xxxxxxxxxx> 
Para: "libssh" <libssh@xxxxxxxxxx> 
Enviados: Viernes, 14 de Abril 2023 7:36:21 
Asunto: Re: Receiving and setting TERM env 

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.