Method parseRouteDistinguisher

Server/src/bgp/EVPN.cpp:159–241

* Parse Route Distinguisher * * \details * Will parse the Route Distinguisher. Based on https://tools.ietf.org/html/rfc4364#section-4.2 * * \param [in/out] data_pointer Pointer to the beginning of Route Distinguisher * \param [out] rd_type Reference to RD type. * \param [out] rd_assigned_number Reference to Assigned Numbe

     * \param [out]     rd_administrator_subfield  Reference to Administrator subfield
     */
    void EVPN::parseRouteDistinguisher(u_char *data_pointer, uint8_t *rd_type, std::string *rd_assigned_number,
                                       std::string *rd_administrator_subfield) {
        std::stringstream   val_ss;

        data_pointer++;
        *rd_type = *data_pointer;
        data_pointer++;

        switch (*rd_type) {
            case 0: {
                uint16_t administration_subfield;
                bzero(&administration_subfield, 2);
                memcpy(&administration_subfield, data_pointer, 2);

                data_pointer += 2;

                uint32_t assigned_number_subfield;
                bzero(&assigned_number_subfield, 4);
                memcpy(&assigned_number_subfield, data_pointer, 4);

                bgp::SWAP_BYTES(&administration_subfield);
                bgp::SWAP_BYTES(&assigned_number_subfield);

                val_ss << assigned_number_subfield;

                *rd_assigned_number = val_ss.str();

                val_ss.clear();
                val_ss << administration_subfield;
                *rd_administrator_subfield = val_ss.str();

                break;
            };

            case 1: {
                u_char administration_subfield[4];
                bzero(&administration_subfield, 4);
                memcpy(&administration_subfield, data_pointer, 4);

                data_pointer += 4;

                uint16_t assigned_number_subfield;
                bzero(&assigned_number_subfield, 2);
                memcpy(&assigned_number_subfield, data_pointer, 2);

                bgp::SWAP_BYTES(&assigned_number_subfield);

                char administration_subfield_chars[INET_ADDRSTRLEN];
                inet_ntop(AF_INET, administration_subfield, administration_subfield_chars, INET_ADDRSTRLEN);

                val_ss << assigned_number_subfield;
                *rd_assigned_number = val_ss.str();

                *rd_administrator_subfield = administration_subfield_chars;

                break;
            };