92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/*
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* ifdown.c Find all network interfaces on the system and
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* shut them down.
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*
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* Copyright (C) 1998 Miquel van Smoorenburg.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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char *v_ifdown = "@(#)ifdown.c 1.11 02-Jun-1998 miquels@cistron.nl";
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/errno.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#define MAX_IFS 64
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/*
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* First, we find all shaper devices and down them. Then we
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* down all real interfaces. This is because the comment in the
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* shaper driver says "if you down the shaper device before the
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* attached inerface your computer will follow".
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*/
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int ifdown(void)
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{
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struct ifreq ifr[MAX_IFS];
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struct ifconf ifc;
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int i, fd;
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int numif;
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int shaper;
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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fprintf(stderr, "ifdown: ");
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perror("socket");
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return -1;
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}
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ifc.ifc_len = sizeof(ifr);
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ifc.ifc_req = ifr;
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if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
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fprintf(stderr, "ifdown: ");
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perror("SIOCGIFCONF");
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close(fd);
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return -1;
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}
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numif = ifc.ifc_len / sizeof(struct ifreq);
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for (shaper = 1; shaper >= 0; shaper--) {
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for (i = 0; i < numif; i++) {
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if ((strncmp(ifr[i].ifr_name, "shaper", 6) == 0)
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!= shaper) continue;
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if (strcmp(ifr[i].ifr_name, "lo") == 0)
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continue;
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if (strchr(ifr[i].ifr_name, ':') != NULL)
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continue;
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ifr[i].ifr_flags &= ~(IFF_UP);
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if (ioctl(fd, SIOCSIFFLAGS, &ifr[i]) < 0) {
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fprintf(stderr, "ifdown: shutdown ");
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perror(ifr[i].ifr_name);
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}
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}
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}
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close(fd);
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return 0;
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}
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