arp.hpp

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#ifndef __JOIN_ARP_HPP__
#define __JOIN_ARP_HPP__
 
// libjoin.
#include <join/macaddress.hpp>
 
// C++.
#include <string>
 
// C.
#include <linux/if_arp.h>
 
namespace join
{
    class Arp
    {
    public:
        Arp () = delete;
 
        Arp (const std::string& interface);
 
        virtual ~Arp () = default;
 
        MacAddress get (const IpAddress& ip);
 
        static MacAddress get (const IpAddress& ip, const std::string& interface);
 
        MacAddress request (const IpAddress& ip);
 
        static MacAddress request (const IpAddress& ip, const std::string& interface);
 
        int add (const MacAddress& mac, const IpAddress& ip);
 
        static int add (const MacAddress& mac, const IpAddress& ip, const std::string& interface);
 
        MacAddress cache (const IpAddress& ip);
 
        static MacAddress cache (const IpAddress& ip, const std::string& interface);
 
    private:
        struct __attribute__ ((packed)) ArpPacket
        {
            uint16_t ar_hrd;
            uint16_t ar_pro;
            uint8_t  ar_hln;
            uint8_t  ar_pln;
            uint16_t ar_op;
            uint8_t  ar_sha[ETH_ALEN];
            uint32_t ar_sip;
            uint8_t  ar_tha[ETH_ALEN];
            uint32_t ar_tip;
        };
 
        struct __attribute__ ((packed)) Packet
        {
            struct ethhdr eth;
            ArpPacket arp;
        };
 
        std::string _interface;
    };
}
 
#endif