#ifndef _NET_IF_H
#define _NET_IF_H
#define IF_NAMESIZE 16
#define IFNAMSIZ IF_NAMESIZE
struct ifreq {
    char ifr_name[IFNAMSIZ];
    union {
        struct sockaddr ifr_addr;
        struct sockaddr ifr_dstaddr;
        struct sockaddr ifr_broadaddr;
        struct sockaddr ifr_netmask;
        short ifr_flags;
        int ifr_ifindex;
        int ifr_metric;
        int ifr_mtu;
        char ifr_slave[IFNAMSIZ];
        char ifr_newname[IFNAMSIZ];
        void* ifr_data;
    };
};
unsigned int if_nametoindex(const char* ifname);
char* if_indextoname(unsigned int ifindex, char* ifname);
#endif