LINUX下获取IP地址和MAC地址

#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_arp.h>
#ifdef SOLARIS
#include <sys/sockio.h>
#endif
#define MAXINTERFACES 16
main (argc, argv)
register int argc;
register char *argv[];
{
   register int fd, intrface, retn = 0;
   struct ifreq buf[MAXINTERFACES];
   struct arpreq arp;
   struct ifconf ifc;
 if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) >= 0)
 {
  ifc.ifc_len = sizeof buf;
  ifc.ifc_buf = (caddr_t) buf;
  if (!ioctl (fd, SIOCGIFCONF, (char *) &ifc))
  {
   //获取接口信息

   intrface = ifc.ifc_len / sizeof (struct ifreq);
    printf("interface num is intrface=%d\n\n\n",intrface);
   //根据借口信息循环获取设备IP和MAC地址

   while (intrface-- > 0)
   {
    //获取设备名称

    printf ("net device %s\n", buf[intrface].ifr_name);
 
    //判断网卡类型

    if (!(ioctl (fd, SIOCGIFFLAGS, (char *) &buf[intrface])))
    {
     if (buf[intrface].ifr_flags & IFF_PROMISC)
     {
      puts ("the interface is PROMISC");
      retn++;
     }
    }
    else
    {
     char str[256];
     sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
     perror (str);
    }
   //判断网卡状态

            if (buf[intrface].ifr_flags & IFF_UP)
   {
                puts("the interface status is UP");
            }
            else
   {
                puts("the interface status is DOWN");
            }
   //获取当前网卡的IP地址

            if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
            {
                 puts ("IP address is:");
                 puts(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
                 puts("");
                   //puts (buf[intrface].ifr_addr.sa_data);

            }
            else
   {
               char str[256];
               sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
               perror (str);
           }

#ifdef SOLARIS
   //获取MAC地址

            arp.arp_pa.sa_family = AF_INET;
            arp.arp_ha.sa_family = AF_INET;
            ((struct sockaddr_in*)&arp.arp_pa)->sin_addr.s_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr.s_addr;
            if (!(ioctl (fd, SIOCGARP, (char *) &arp)))
            {
                 puts ("HW address is:");
    //以十六进制显示MAC地址

                 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
                                (unsigned char)arp.arp_ha.sa_data[0],
                                (unsigned char)arp.arp_ha.sa_data[1],
                                (unsigned char)arp.arp_ha.sa_data[2],
                                (unsigned char)arp.arp_ha.sa_data[3],
                                (unsigned char)arp.arp_ha.sa_data[4],
                                (unsigned char)arp.arp_ha.sa_data[5]);
                 puts("");
                 puts("");
            }

#else
#if 0
   
            if (!(ioctl (fd, SIOCGENADDR, (char *) &buf[intrface])))
            {
                 puts ("HW address is:");
                 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
                                (unsigned char)buf[intrface].ifr_enaddr[0],
                                (unsigned char)buf[intrface].ifr_enaddr[1],
                                (unsigned char)buf[intrface].ifr_enaddr[2],
                                (unsigned char)buf[intrface].ifr_enaddr[3],
                                (unsigned char)buf[intrface].ifr_enaddr[4],
                                (unsigned char)buf[intrface].ifr_enaddr[5]);
                 puts("");
                 puts("");
            }
#endif
            if (!(ioctl (fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
            {
                 puts ("HW address is:");
                 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
                                (unsigned char)buf[intrface].ifr_hwaddr.sa_data[0],
                                (unsigned char)buf[intrface].ifr_hwaddr.sa_data[1],
                                (unsigned char)buf[intrface].ifr_hwaddr.sa_data[2],
                                (unsigned char)buf[intrface].ifr_hwaddr.sa_data[3],
                                (unsigned char)buf[intrface].ifr_hwaddr.sa_data[4],
                                (unsigned char)buf[intrface].ifr_hwaddr.sa_data[5]);
                 puts("");
                 puts("");
             }
#endif
            else
   {
               char str[256];
               sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
               perror (str);
           }
        } //while

      } else
         perror ("cpm: ioctl");
   } else
      perror ("cpm: socket");
    close (fd);
    return retn;
}