mac.c

MAC源码

#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>

#define MAXINTERFACES 16

int 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)) {
          intrface = ifc.ifc_len / sizeof(struct ifreq);
          printf("interface num is intrface=%d\n\n\n", intrface);
          while (intrface-- > 0) {
            printf("net device %s\n", buf[intrface].ifr_name);

/*Jugde whether the net card status is promisc*/
            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);
            }

/*Jugde whether the net card status is up*/
            if (buf[intrface].ifr_flags & IFF_RUNNING) {
                puts("the interface status is UP");
            } else {
                puts("the interface status is DOWN");
            }

/*Get IP of the net card */
            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);
            }

/*Get HW ADDRESS of the net card */
            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("");
            }

            else {
                char str[256];

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

    } else
      perror("cpm: socket");

    close(fd);
    return retn;
}