#include
#include
#include
#include
#include

#define IFNAMSIZ     16
 
struct ifreq {
    char    ifr_name[IFNAMSIZ];  // interface name, e.g., "eth0"
    union {
        struct  sockaddr ifru_addr;
        struct  sockaddr ifru_dstaddr;
        struct  sockaddr ifru_broadaddr;
        short   ifru_flags;
        int     ifru_metric;
        caddr_t ifru_data;
    } ifr_ifru;
};
 
 
unsigned long do_ioctl_get_ipaddress(char *dev)
{
        struct ifreq ifr;
        int fd;
        unsigned long ip;
        struct in_addr tmp_addr;
              
        strcpy(ifr.ifr_ifru.ifr_name, dev);
        fd = socket(AF_INET, SOCK_DGRAM, 0);
        if (ioctl(fd, SIOCGIFADDR, &ifr)) {
                perror("ioctl error");
                return 0;
        }
        close(fd);
        memcpy(&ip,ifr.ifr_addr.sa_data + 2,4);
        tmp_addr.s_addr=ip;
 printf("%s : %s\n", dev, inet_ntoa(tmp_addr));
        return ip;
}