dns_protocol.hpp

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#ifndef JOIN_FABRIC_DNS_PROTOCOL_HPP
#define JOIN_FABRIC_DNS_PROTOCOL_HPP
 
// libjoin.
#include <join/protocol.hpp>
 
namespace join
{
    template <class Protocol>
    class BasicDatagramResolver;
 
    template <class Protocol>
    class BasicDatagramNameServer;
 
    class Dns
    {
    public:
        using Endpoint = BasicInternetEndpoint<Dns>;
        using Socket = BasicDatagramSocket<Dns>;
        using Resolver = BasicDatagramResolver<Dns>;
        using NameServer = BasicDatagramNameServer<Dns>;
 
        constexpr explicit Dns (int family = AF_INET) noexcept
        : _family (family)
        {
        }
 
        static inline Dns& v4 () noexcept
        {
            static Dns dnsv4 (AF_INET);
            return dnsv4;
        }
 
        static inline Dns& v6 () noexcept
        {
            static Dns dnsv6 (AF_INET6);
            return dnsv6;
        }
 
        constexpr int family () const noexcept
        {
            return _family;
        }
 
        constexpr int type () const noexcept
        {
            return SOCK_DGRAM;
        }
 
        constexpr int protocol () const noexcept
        {
            return IPPROTO_UDP;
        }
 
        static constexpr uint16_t defaultPort = 53;
 
        static constexpr size_t maxMsgSize = 8192;
 
    private:
        int _family;
    };
 
    constexpr bool operator== (const Dns& a, const Dns& b) noexcept
    {
        return a.family () == b.family ();
    }
 
    constexpr bool operator!= (const Dns& a, const Dns& b) noexcept
    {
        return !(a == b);
    }
}
 
#endif