static std::vector get_FQDNs()

in common/util.hpp [659:708]

• 37 lines of code
• 7 McCabe index (conditional complexity)

    static std::vector<std::string> get_FQDNs( std::string domain_name )
    {
        /**
         * Find SRV record
         *  "The SRV or "service locator" DNS record type enables service discovery in the DNS.
         *   SRV records allow services to be advertised on specific ports and used in an order
         * controlled by the owner of the service. SRV also provides a load balancing feature."
         *  https://www.nslookup.io/learning/dns-record-types/srv/
         */

        // https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/verify-srv-dns-records-have-been-created#method-3-use-nslookup
        std::string cmd = "nslookup -type=srv _ldap._tcp.dc._msdcs." + domain_name + " | grep " +
                          domain_name + " | sed 's/^.* //g'";

        std::pair<int, std::string> nslookup_output = Util::exec_shell_cmd( cmd );
        std::vector<std::string> fqdns;

        if ( nslookup_output.first == 0 )
        {
            fqdns = split_string( nslookup_output.second, '\n' );
            for ( auto& fqdn : fqdns )
            {
                if ( fqdn.back() == '.' )
                {
                    fqdn.pop_back();
                }
            }

            return fqdns;
        }
        else
        {
            cmd = "dig +short _ldap._tcp.dc._msdcs." + domain_name + " -t any | sed 's/^.* //g'";
            nslookup_output = Util::exec_shell_cmd( cmd );
            if ( nslookup_output.first == 0 )
            {
                std::vector<std::string> fqdns = split_string( nslookup_output.second, '\n' );
                for ( auto& fqdn : fqdns )
                {
                    if ( fqdn.back() == '.' )
                    {
                        fqdn.pop_back();
                    }
                }
                return fqdns;
            }
        }

        return fqdns;
    }