So, this is what I want to do:
there is a local non-superuser and it can upload the file into /tmp.
Using this account, I download a telnet server package equivalent to what is already installed.
I modify some settings, setting all file directories into /tmp.
Then compile and run as a standalone telnet server.
Is this possible? If not, what makes this impossible?
Or as a non-privileged user, would there be any way to enable telnet?