/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: checkrev.c,v 1.12.2.1 2004/03/09 14:44:39 darrenr Exp $
 */

#include <sys/ioctl.h>
#include <fcntl.h>

#include "ipf.h"
#include "netinet/ipl.h"

int checkrev(ipfname)
char *ipfname;
{
        static int vfd = -1;
        struct friostat fio, *fiop = &fio;
        ipfobj_t ipfo;

        bzero((caddr_t)&ipfo, sizeof(ipfo));
        ipfo.ipfo_rev = IPFILTER_VERSION;
        ipfo.ipfo_size = sizeof(*fiop);
        ipfo.ipfo_ptr = (void *)fiop;
        ipfo.ipfo_type = IPFOBJ_IPFSTAT;

        if ((vfd == -1) && ((vfd = open(ipfname, O_RDONLY)) == -1)) {
                perror("open device");
                return -1;
        }

        if (ioctl(vfd, SIOCGETFS, &ipfo)) {
                perror("ioctl(SIOCGETFS)");
                close(vfd);
                vfd = -1;
                return -1;
        }

        if (strncmp(IPL_VERSION, fio.f_version, sizeof(fio.f_version))) {
                return -1;
        }
        return 0;
}