extern void get_mac(char *, int, int);
extern void get_ip(struct in_addr *, int, int, char *);
extern void get_mask(struct in_addr *, int, int, char *);
extern void get_mac(char *, int, int);
extern void get_ip(struct in_addr *, int, int, char *);
extern void get_mask(struct in_addr *, int, int, char *);