how to make remote login and remote installation via libssh
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It isn't clear from your question whether you want to write a program that uses ssh/ssl to perform a login & install procedure, or whether you want to use a ready-made tool to do this. If the latter, the ssh client can be used to login to a remote host (that must have a ssh daemon running). If the former, please provide more details of specifically what your application must do, and at least let us know what programming language you intend to implement it with. Many common libraries have bindings to numerous programming languages. It seems likely that an existing ssh client plus some shell scripting can be used to do most, if not all, of your objective.
I took a look at the online documentation for the library, and I thought it looked pretty good. As for how to perform a software installation on the remote host, I think you will have to create a system that feeds command strings into your ssh connections, and then reads the responses. You will have to go through a number of manual installation sessions to see what strings are required (what stuff you would manually type).
Alternatively, you could simply set up a script or program on the remote host, and invoke it with a ssh session in a cron job. This sounds a lot easier, and more conventional.
Using either method, you will need to set up ssl keys on the respective machines to eliminate interactive password entry. If you haven't already done that, it would be the best place to start. You may learn something that is generally useful, even beyond the parameters of this project.
Get a start on your project and come back with some more specific questions.