Re: SSH Global Request

[Michal Vaško <mvasko@xxxxxxxxx>]

Hi Jakub,
right, I have not noticed the function before, thanks. However, I am not sure the API is suitable. What is the general behavior, meaning what happens if a reply is not sent back? Is the connection automatically disconnected? Is it possible to use custom max probes (how many keep-alive packets are sent unsuccessfully before a connection is considered dead) and probe interval (the interval between keep-alive packets) or some specific values are always used? There is no documentation, that is why I am asking. Thanks for providing these details.

Regards,
Michal

On Friday, March 6, 2020 11:29 CET, Jakub Jelen <jjelen@xxxxxxxxxx> wrote:

> On Fri, 2020-03-06 at 09:11 +0100, Michal Vaško wrote:
> > Hello,
> > I was wondering if the authors of libssh would have anything against
> > making ssh_global_request() function from channels.h public. It would
> > enable implementing NETCONF Call Home SSH keep-alive [1]. Thanks.
>
> Hello,
> in server side, there is already API for sending keepalive messages:
>
> https://gitlab.com/libssh/libssh-mirror/-/blob/master/include/libssh/server.h#L368
>
> In the connection, only one of the peers needs to send the keepalive
> messages to keep a connection alive.
>
> If you need the similar functionality in the client, I would rather see
> it implemented by creating a new API function than exposing this
> internal function.
>
> Regards,
> --
> Jakub Jelen
> Senior Software Engineer
> Security Technologies
> Red Hat, Inc.
>
>