shishi_realm_default_guess3

Usage

Overview

Guesses a realm based on getdomainname(), which really responds with a NIS/YP domain, but if set properly, it might be a good first guess. If this NIS query fails, call gethostname(), and on its failure, fall back to returning the artificial string "could-not-guess-default-realm".

Note that the hostname is not trimmed off of the string returned by gethostname(), thus pretending the local host name is a valid realm name. The resulting corner case could merit a check that the suggested realm is distinct from the fully qualifies host, and if not, simply strip the host name from the returned string before it is used in an application. One reason for sticking with the present behaviour, is that some systems respond with a non-qualified host name as reply from gethostname().

Return value

Returns a guessed realm for the running host, containing a string that has to be deallocated with free() by the caller.