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/*
* ifdown.c Find all network interfaces on the system and
* shut them down.
*
* Copyright (C) 1998 Miquel van Smoorenburg.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
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 <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
/*
* 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 ifreq ifr[MAX_IFS];
struct ifconf ifc;
int i, fd;
int numif;
int shaper;
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 (shaper = 1; shaper >= 0; shaper--) {
for (i = 0; i < numif; i++) {
if ((strncmp(ifr[i].ifr_name, "shaper", 6) == 0)
!= shaper) continue;
if (strcmp(ifr[i].ifr_name, "lo") == 0)
continue;
if (strchr(ifr[i].ifr_name, ':') != NULL)
continue;
/* Read interface flags */
if (ioctl(fd, SIOCGIFFLAGS, &ifr[i]) < 0) {
fprintf(stderr, "ifdown: shutdown ");
perror(ifr[i].ifr_name);
continue;
}
/*
* Expected in <net/if.h> according to
* "UNIX Network Programming".
*/
#ifdef ifr_flags
# define IRFFLAGS ifr_flags
#else /* Present on kFreeBSD */
# define IRFFLAGS ifr_flagshigh
#endif
if (ifr[i].IRFFLAGS & IFF_UP) {
ifr[i].IRFFLAGS &= ~(IFF_UP);
if (ioctl(fd, SIOCSIFFLAGS, &ifr[i]) < 0) {
fprintf(stderr, "ifdown: shutdown ");
perror(ifr[i].ifr_name);
}
}
#undef IRFFLAGS
}
}
close(fd);
return 0;
}
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