/* $NetBSD: checkmount_default.c,v 1.1.1.3 2015/01/17 16:34:16 christos Exp $ */
/*
* Copyright (c) 1997-2014 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. 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.
*
*
* File: am-utils/conf/checkmount/checkmount_default.c
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#ifndef _PATH_MTAB
#define _PATH_MTAB "/etc/mtab"
#endif /* not _PATH_MTAB */
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)
{
FILE *mtab;
mntent_t *ment;
int found = 0;
/* scan mtab for path */
if (!(mtab = setmntent(_PATH_MTAB, "r"))) {
perror(_PATH_MTAB);
exit(1);
}
/*
* setmntent() doesn't do locking in read-only mode. Too bad -- it seems to
* rely on mount() and friends to do atomic updates by renaming the file.
* Well, our patched amd rewrites mtab in place to avoid NFS lossage, so
* better do the locking ourselves.
*/
#ifdef HAVE_FLOCK
if (flock(fileno(mtab), LOCK_SH) < 0) {
#else /* not HAVE_FLOCK */
if (lockf(fileno(mtab), F_LOCK, 0) < 0) {
#endif /* not HAVE_FLOCK */
perror(_PATH_MTAB);
exit(1);
}
while (!found && (ment = getmntent(mtab))) {
char *colon;
if ((colon = strchr(ment->mnt_fsname, ':'))) {
*colon = '\0';
if ((STREQ(colon + 1, path) ||
STREQ(ment->mnt_dir, path)) &&
is_same_host(ment->mnt_fsname, host, hostaddr))
found = 1;
}
}
(void) endmntent(mtab);
if (!found) {
char *swap;
/* swap files never show up in mtab, only root fs */
if ((swap = strstr(path, "swap"))) {
strncpy(swap, "root", 4); /* this should NOT use xstrlcpy */
found = fixmount_check_mount(host, hostaddr, path);
strncpy(swap, "swap", 4); /* this should NOT use xstrlcpy */
}
}
return found;
}