mdns_protocol.hpp

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#ifndef JOIN_FABRIC_MDNS_PROTOCOL_HPP
#define JOIN_FABRIC_MDNS_PROTOCOL_HPP
 
// libjoin.
#include <join/protocol.hpp>
 
namespace join
{
    template <class Protocol>
    class BasicDatagramPeer;
 
    class Mdns
    {
    public:
        using Endpoint = BasicInternetEndpoint<Mdns>;
        using Socket = BasicDatagramSocket<Mdns>;
        using Peer = BasicDatagramPeer<Mdns>;
 
        constexpr explicit Mdns (int family = AF_INET) noexcept
        : _family (family)
        {
        }
 
        static inline Mdns& v4 () noexcept
        {
            static Mdns mdnsv4 (AF_INET);
            return mdnsv4;
        }
 
        static inline Mdns& v6 () noexcept
        {
            static Mdns mdnsv6 (AF_INET6);
            return mdnsv6;
        }
 
        constexpr int family () const noexcept
        {
            return _family;
        }
 
        constexpr int type () const noexcept
        {
            return SOCK_DGRAM;
        }
 
        constexpr int protocol () const noexcept
        {
            return IPPROTO_UDP;
        }
 
        static IpAddress multicastAddress (int family) noexcept
        {
            return (family == AF_INET6) ? "ff02::fb" : "224.0.0.251";
        }
 
        static constexpr uint16_t defaultPort = 5353;
 
        static constexpr size_t maxMsgSize = 8192;
 
    private:
        int _family;
    };
 
    constexpr bool operator== (const Mdns& a, const Mdns& b) noexcept
    {
        return a.family () == b.family ();
    }
 
    constexpr bool operator!= (const Mdns& a, const Mdns& b) noexcept
    {
        return !(a == b);
    }
}
 
#endif