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//
//  ipv4_ipv6_checker.hpp
//  BBAAPIRequest
//
//  Created by Cai,Rui(MAD) on 2018/9/13.
//
#ifndef SMARTHTTPDNS_DNS_CHECKER_H_
#define SMARTHTTPDNS_DNS_CHECKER_H_
#include <stdio.h>

namespace smarthttpdns {
    class DnsChecker {
        
    private:
        // last time IPv6 cache time
        int64_t last_ipv6_probe_time_;
        // last time IPv4 cache time
        int64_t last_ipv4_probe_time_;
        // isIPv4Reachable last cache
        bool last_ipv6_probe_result_;
        // isIPv6Reachable last cache
        bool last_ipv4_probe_result_;
        
        // gets the current UTC time.
        void getCurrentTime(int64_t* second);
        // check IPv4/IPv6 Avaliable
        bool isGloballyReachable(bool isIPv4);
    public:
        bool isIPv4Reachable();
        bool isIPv6Reachable();
    };
}
#endif // SMARTHTTPDNS_DNS_CHECKER_H_