Method querySrv

src/SFML/Network/Dns.cpp:714–793

///////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
std::vector<Dns::SrvRecord> Dns::querySrv(const String& hostname, const std::vector<IpAddress>& servers, std::optional<Time> timeout)
{
    std::vector<SrvRecord> srvRecords;

    if (hostname.isEmpty())
        return srvRecords;

    auto encoded = encodeHostname(hostname);

    // On Android the libc provided resolv API doesn't work, we will have to do the work ourselves
#if defined(SFML_SYSTEM_ANDROID)
    const auto& serversToQuery = servers.empty() ? getAndroidServers() : servers;
#else
    const auto& serversToQuery = servers;
#endif

    if (!serversToQuery.empty())
    {
        queryDns(
            [&](const char* data, std::size_t length, const char* messageBegin, std::uint16_t responseType, std::uint16_t responseClass)
            {
                // SRV, IN
                if ((responseType != 33) || (responseClass != 1))
                    return;

                const auto priority = readU16(data, data + length);
                const auto weight   = readU16(data, data + length);
                const auto port     = readU16(data, data + length);
                auto       target   = readName(data, data + length, messageBegin);

                if (!target.empty())
                    srvRecords.emplace_back(SrvRecord{decodeHostname(target), port, weight, priority});
            },
            timeout,
            {{serversToQuery,
              33, // SRV
              1,  // IN
              encoded}});

        return srvRecords;
    }

#if defined(SFML_SYSTEM_WINDOWS)
    const auto records = getRecords(encoded, DNS_TYPE_SRV);
    for (const auto* ptr = records.get(); ptr; ptr = ptr->pNext)
    {
        if ((ptr->wType == DNS_TYPE_SRV) && (ptr->Data.SRV.pNameTarget != nullptr))
        {
            srvRecords.emplace_back(SrvRecord{decodeHostname(sf::String(ptr->Data.SRV.pNameTarget).toAnsiString()),
                                              ptr->Data.SRV.wPort,
                                              ptr->Data.SRV.wWeight,
                                              ptr->Data.SRV.wPriority});
        }
    }
#else
    getRecords(encoded,
               ns_t_srv,
               [&srvRecords](const ns_msg& handle, const ns_rr& record)