static std::pair get_machine_principal()

in common/util.hpp [933:984]

• 41 lines of code
• 5 McCabe index (conditional complexity)

    static std::pair<int, std::string> get_machine_principal( std::string domain_name,
                                                              CF_logger& cf_logger )
    {
        std::pair<int, std::string> result = std::make_pair( -1, "" );

        char hostname[HOST_NAME_MAX];
        int status = gethostname( hostname, HOST_NAME_MAX );
        if ( status )
        {
            result.first = status;
            return result;
        }

        std::pair<int, std::string> realm_name_result = Util::get_realm_name();
        if ( realm_name_result.first != 0 )
        {
            return realm_name_result;
        }

        std::pair<int, std::string> domain_name_result = Util::check_domain_name( domain_name );
        if ( domain_name_result.first != 0 )
        {
            return domain_name_result;
        }

        std::string s = std::string( hostname );
        std::string host_name = s.substr( 0, s.find( '.' ) );

        // truncate the hostname to the host name size limit defined by microsoft
        if ( host_name.length() > HOST_NAME_LENGTH_LIMIT )
        {
            std::string log_message = "WARNING: " + std::string( __func__ ) + " : " +
                                      std::to_string( __LINE__ ) +
                                      " hostname exceeds 15 characters, this can cause problems in "
                                      "getting kerberos tickets, please reduce hostname length";
            cf_logger.logger( LOG_ERR, log_message.c_str() );
            host_name = host_name.substr( 0, HOST_NAME_LENGTH_LIMIT );
            std::cerr << Util::getCurrentTime() << '\t'
                      << "INFO: hostname exceeds 15 characters this can "
                         "cause problems in getting kerberos tickets, "
                         "please reduce hostname length"
                      << std::endl;
        }

        /**
         * Machine principal is of the format EC2AMAZ-Q5VJZQ$@CONTOSO.COM'
         */
        result.first = 0;
        result.second = "'" + host_name + "$@'" + realm_name_result.second;

        return result;
    }