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/*
* ifdown.c Find all network interfaces on the system and
* shut them down.
*
*/
char *v_ifdown = "@(#)ifdown.c 1.11 02-Jun-1998 miquels@cistron.nl";
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/in.h>
/*
* First, we find all shaper devices and down them. Then we
* down all real interfaces. This is because the comment in the
* shaper driver says "if you down the shaper device before the
* attached inerface your computer will follow".
*/
int ifdown(void)
{
struct if_nameindex *ifa, *ifp;
struct ifreq ifr;
int fd, shaper;
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
fprintf(stderr, "ifdown: ");
perror("socket");
goto error;
}
if ((ifa = if_nameindex()) == NULL) {
fprintf(stderr, "ifdown: ");
perror("if_nameindex");
goto error;
}
for (shaper = 1; shaper >= 0; shaper--) {
for (ifp = ifa; ifp->if_index; ifp++) {
if ((strncmp(ifp->if_name, "shaper", 6) == 0)
!= shaper) continue;
if (strcmp(ifp->if_name, "lo") == 0)
continue;
if (strchr(ifp->if_name, ':') != NULL)
continue;
strncpy(ifr.ifr_name, ifp->if_name, IFNAMSIZ-1);
ifr.ifr_name[IFNAMSIZ-1] = 0;
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
fprintf(stderr, "ifdown: shutdown ");
perror(ifp->if_name);
goto error;
}
ifr.ifr_flags &= ~(IFF_UP);
if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
fprintf(stderr, "ifdown: shutdown ");
perror(ifp->if_name);
goto error;
}
}
}
close(fd);
return 0;
error:
close(fd);
return -1;
}
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