ksDomainQuery.h

/*
 *  Copyright (c) 2025, Krzysztof Strehlau
 *
 *  This file is a part of the ksIotFramework library.
 *  All licensing information can be found inside LICENSE.md file.
 *
 *  https://github.com/cziter15/ksIotFrameworkLib/blob/master/LICENSE
 */
 
#pragma once
 
#include <Arduino.h>
#include <IPAddress.h>
#include <inttypes.h>
#include <memory>
 
#if (defined(ESP32) && ESP_ARDUINO_VERSION_MAJOR >= 3)
    #define ksUdpClient_t NetworkUDP
#else
    #define ksUdpClient_t WiFiUDP
#endif
 
class ksUdpClient_t;
 
namespace ksf::misc 
{
    class ksDomainQuery
    {
        protected:
            /* DNS server IP address. */
            IPAddress serverIP;
            /* UDP client. */
            std::unique_ptr<ksUdpClient_t> udp;
 
            /* Domain to resolve IP address for. */
            std::string domain;
            /* Resolved IP address. */
            IPAddress resolvedIP;
            /* Transaction ID (last). */
            uint16_t transactionID{0};
            /* Last query send time. */
            uint32_t lastQuerySendTimeMs{0};
 
            void sendQuery();
 
            void receiveResponse();
 
        public:
            ksDomainQuery();
 
            virtual ~ksDomainQuery();
 
            ksDomainQuery(IPAddress dnsServer);
            void invalidate();
 
            void setDomain(std::string domain);
 
            bool getResolvedIP(IPAddress& ip) const;
 
            void process();
    };
}