get_mac

#include
#include
#include
#include
#include
#include

int get_ethx_mac(char *psz_mac, int size, char *psz_ethn, int *ptr_active)
{
    //函数输入参数合法性校验
 if ((NULL == psz_mac) || size < 18 || NULL == psz_ethn
        || NULL == ptr_active
        || strlen(psz_ethn) >= sizeof(struct ifreq))
    {
        return -1;
    }

    int             i_fd;
 struct ifreq    st_ifreq;
 unsigned char*  hwaddr;
 int             i;

    *ptr_active = 0;

 //创建套接字i_fd
 if((i_fd = socket(AF_INET,SOCK_STREAM,0)) <= 0)
 {
  return -2;
 }

    memset(&st_ifreq, 0x0, sizeof(struct ifreq));
    strcpy(st_ifreq.ifr_name,psz_ethn);

    if(ioctl(i_fd,SIOCGIFFLAGS,&st_ifreq) < 0)
    {
        close(i_fd);
        return -4;
    }

    if((st_ifreq.ifr_flags & IFF_UP) && (st_ifreq.ifr_flags & IFF_RUNNING))
    {
        *ptr_active = 1;
    }

    if(ioctl(i_fd,SIOCGIFHWADDR,&st_ifreq) < 0)
    {
        close(i_fd);
        return -3;
    }

    hwaddr = (unsigned char*)st_ifreq.ifr_hwaddr.sa_data;
    sprintf(psz_mac,"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
        hwaddr[0],hwaddr[1],hwaddr[2],
        hwaddr[3],hwaddr[4],hwaddr[5]);

 close(i_fd);
 return 0;
}