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ifdown.c

/*
 * ifdown.c Find all network interfaces on the system and
 *          shut them down.
 *
 */
char *v_ifdown = "@(#)ifdown.c  1.10  21-Apr-1997  miquels@cistron.nl";

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <string.h>

#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/errno.h>

#include <net/if.h>
#include <netinet/in.h>

#define MAX_IFS   64

int ifdown(void)
{
      struct ifreq ifr[MAX_IFS];
      struct ifconf ifc;
      int i, fd;
      int numif;

      if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
            fprintf(stderr, "ifdown: ");
            perror("socket");
            return -1;
      }
      ifc.ifc_len = sizeof(ifr);
      ifc.ifc_req = ifr;

      if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
            fprintf(stderr, "ifdown: ");
            perror("SIOCGIFCONF");
            close(fd);
            return -1;
      }
      numif = ifc.ifc_len / sizeof(struct ifreq);

      for(i = 0; i < numif; i++) {
            if (strcmp(ifr[i].ifr_name, "lo") == 0)
                  continue;
            if (strchr(ifr[i].ifr_name, ':') != NULL)
                  continue;
            ifr[i].ifr_flags &= ~(IFF_UP);
            if (ioctl(fd, SIOCSIFFLAGS, &ifr[i]) < 0) {
                  fprintf(stderr, "ifdown: shutdown ");
                  perror(ifr[i].ifr_name);
            }
      }

      close(fd);

      return 0;
}

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