NetBSD/usr.sbin/amd/fixmount/check_mount.c

/*	$NetBSD: check_mount.c,v 1.5 1999/02/01 19:05:12 christos Exp $	*/

/*
 * Copyright (c) 1997-1999 Erez Zadok
 * Copyright (c) 1990 Jan-Simon Pendry
 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry at Imperial College, London.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      %W% (Berkeley) %G%
 *
 * Id: checkmount_bsd44.c,v 1.2 1999/01/10 21:54:06 ezk Exp 
 *
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>

extern int is_same_host(char *name1, char *name2, struct in_addr addr2);
int fixmount_check_mount(char *host, struct in_addr hostaddr, char *path);


int
fixmount_check_mount(char *host, struct in_addr hostaddr, char *path)
{
  struct statfs *mntbufp, *mntp;
  int nloc, i;
  char *colon;

  /* read mount table from kernel */
  nloc = getmntinfo(&mntbufp, MNT_NOWAIT);
  if (nloc <= 0) {
    perror("getmntinfo");
    exit(1);
  }

  mntp = mntbufp;
  for (i=0; i<nloc; ++i) {
    if ((colon = strchr(mntp->f_mntfromname, ':'))) {
      *colon = '\0';
      if (STREQ(colon + 1, path) &&
	  is_same_host(mntp->f_mntfromname, host, hostaddr))
	return 1;
    }
  }

  return 0;
}