1/*	$NetBSD$	*/
2
3/*
4 * Copyright (c) 1997-2009 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgment:
23 *      This product includes software developed by the University of
24 *      California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *
42 * File: am-utils/conf/checkmount/checkmount_default.c
43 *
44 */
45
46#ifdef HAVE_CONFIG_H
47# include <config.h>
48#endif /* HAVE_CONFIG_H */
49#include <am_defs.h>
50
51#ifndef _PATH_MTAB
52#define _PATH_MTAB "/etc/mtab"
53#endif /* not _PATH_MTAB */
54
55extern int is_same_host(char *name1, char *name2, struct in_addr addr2);
56
57
58int
59fixmount_check_mount(char *host, struct in_addr hostaddr, char *path)
60{
61  FILE *mtab;
62  mntent_t *ment;
63  int found = 0;
64
65  /* scan mtab for path */
66  if (!(mtab = setmntent(_PATH_MTAB, "r"))) {
67    perror(_PATH_MTAB);
68    exit(1);
69  }
70
71  /*
72   * setmntent() doesn't do locking in read-only mode. Too bad -- it seems to
73   * rely on mount() and friends to do atomic updates by renaming the file.
74   * Well, our patched amd rewrites mtab in place to avoid NFS lossage, so
75   * better do the locking ourselves.
76   */
77#ifdef HAVE_FLOCK
78  if (flock(fileno(mtab), LOCK_SH) < 0) {
79#else /* not HAVE_FLOCK */
80  if (lockf(fileno(mtab), F_LOCK, 0) < 0) {
81#endif /* not HAVE_FLOCK */
82    perror(_PATH_MTAB);
83    exit(1);
84  }
85
86  while (!found && (ment = getmntent(mtab))) {
87    char *colon;
88
89    if ((colon = strchr(ment->mnt_fsname, ':'))) {
90      *colon = '\0';
91      if ((STREQ(colon + 1, path) ||
92	   STREQ(ment->mnt_dir, path)) &&
93	  is_same_host(ment->mnt_fsname, host, hostaddr))
94	  found = 1;
95    }
96  }
97
98  (void) endmntent(mtab);
99
100  if (!found) {
101    char *swap;
102
103    /* swap files never show up in mtab, only root fs */
104    if ((swap = strstr(path, "swap"))) {
105      strncpy(swap, "root", 4);	/* this should NOT use xstrlcpy  */
106      found = fixmount_check_mount(host, hostaddr, path);
107      strncpy(swap, "swap", 4);	/* this should NOT use xstrlcpy  */
108    }
109  }
110  return found;
111}
112