140 lines
3.5 KiB
C
140 lines
3.5 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 <errno.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 <net/if.h>
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#include <netinet/in.h>
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#define MAX_IFS 64
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/* XXX: Ideally this would get detected at configure time... */
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
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defined(__NetBSD__) || defined(__OpenBSD__)
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#define HAVE_SOCKADDR_SA_LEN 1
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#endif
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#ifndef _SIZEOF_ADDR_IFREQ
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#ifdef HAVE_SOCKADDR_SA_LEN
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#define _SIZEOF_ADDR_IFREQ(ifr) \
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((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
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(sizeof((ifr).ifr_name) + (ifr).ifr_addr.sa_len) : \
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sizeof(struct ifreq))
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#else
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#define _SIZEOF_ADDR_IFREQ(ifr) sizeof(struct ifreq)
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#endif
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#endif
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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 interface your computer will follow".
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*/
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int ifdown(void)
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{
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char ifr_buf[sizeof(struct ifreq) * MAX_IFS];
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char *ifr_end;
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struct ifconf ifc;
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int fd;
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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_buf);
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ifc.ifc_buf = ifr_buf;
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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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ifr_end = ifr_buf + ifc.ifc_len;
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for (shaper = 1; shaper >= 0; shaper--) {
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char *ifr_next = ifr_buf;
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while (ifr_next < ifr_end) {
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struct ifreq *ifr;
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int flags;
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ifr = (struct ifreq *)ifr_next;
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ifr_next += _SIZEOF_ADDR_IFREQ(*ifr);
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if ((strncmp(ifr->ifr_name, "shaper", 6) == 0)
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!= shaper) continue;
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if (strncmp(ifr->ifr_name, "lo", 2) == 0)
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continue;
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if (strchr(ifr->ifr_name, ':') != NULL)
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continue;
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/* Read interface flags */
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if (ioctl(fd, SIOCGIFFLAGS, ifr) < 0) {
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fprintf(stderr, "ifdown: shutdown ");
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perror(ifr->ifr_name);
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continue;
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}
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/*
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* Expected in <net/if.h> according to
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* "UNIX Network Programming".
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*/
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#ifdef ifr_flagshigh
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flags = (ifr->ifr_flags & 0xffff) |
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(ifr->ifr_flagshigh << 16);
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#else
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flags = ifr->ifr_flags;
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#endif
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if (flags & IFF_UP) {
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flags &= ~(IFF_UP);
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#ifdef ifr_flagshigh
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ifr->ifr_flags = flags & 0xffff;
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ifr->ifr_flagshigh = flags >> 16;
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#else
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ifr->ifr_flags = flags;
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#endif
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if (ioctl(fd, SIOCSIFFLAGS, ifr) < 0) {
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fprintf(stderr, "ifdown: shutdown ");
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perror(ifr->ifr_name);
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}
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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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