There needs to be a binary that fetches supported/preferred options

[Kaiepi]

Using it should look like this:

%bastille p6telnet-fetch-options telehack.com 43
Supported: ...
Preferred: ...

This will require using Net::Telnet::Client to connect to a server using a hostname and port passed via the command line and finding a way to determine when the server is done sending its initial list of options it wishes to use. You may need to subclass Net::Telnet::Client.