checkrev.c revision 170268 
1/*	$FreeBSD: head/contrib/ipfilter/lib/checkrev.c 170268 2007-06-04 02:54:36Z darrenr $	*/
2
3/*
4 * Copyright (C) 2000-2004 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * $Id: checkrev.c,v 1.12.2.2 2006/06/16 17:20:56 darrenr Exp $
9 */
10
11#include <sys/ioctl.h>
12#include <fcntl.h>
13
14#include "ipf.h"
15#include "netinet/ipl.h"
16
17int checkrev(ipfname)
18char *ipfname;
19{
20	static int vfd = -1;
21	struct friostat fio, *fiop = &fio;
22	ipfobj_t ipfo;
23
24	bzero((caddr_t)&ipfo, sizeof(ipfo));
25	ipfo.ipfo_rev = IPFILTER_VERSION;
26	ipfo.ipfo_size = sizeof(*fiop);
27	ipfo.ipfo_ptr = (void *)fiop;
28	ipfo.ipfo_type = IPFOBJ_IPFSTAT;
29
30	if ((vfd == -1) && ((vfd = open(ipfname, O_RDONLY)) == -1)) {
31		perror("open device");
32		return -1;
33	}
34
35	if (ioctl(vfd, SIOCGETFS, &ipfo)) {
36		perror("ioctl(SIOCGETFS)");
37		close(vfd);
38		vfd = -1;
39		return -1;
40	}
41
42	if (strncmp(IPL_VERSION, fio.f_version, sizeof(fio.f_version))) {
43		return -1;
44	}
45	return 0;
46}
47