sasl_checkpass()
will check a plaintext password. This is needed for protocols that had a login method before SASL (for example the LOGIN command in IMAP). The password is checked with the
pwcheck_method
See sasl_callbacks(3) for information on how this parameter is set.
RETURN VALUE
sasl_checkpass returns an integer which corresponds to one of the
following codes. SASL_OK indicates that the authentication is
complete. All other return codes indicate errors and should either be
handled or the authentication session should be quit. See sasl_errors(3)
for meanings of return codes.