1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Copyright 2006 Ricardo Correia.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28/*	Copyright (c) 1988 AT&T	*/
29/*	  All Rights Reserved	*/
30
31#include <stdio.h>
32#include <string.h>
33#include <mntent.h>
34#include <sys/errno.h>
35#include <sys/mnttab.h>
36
37#include <sys/types.h>
38#include <sys/sysmacros.h>
39#include <sys/stat.h>
40#include <unistd.h>
41
42#define	BUFSIZE	(MNT_LINE_MAX + 2)
43
44__thread char buf[BUFSIZE];
45
46#define	DIFF(xx)	( \
47	    (mrefp->xx != NULL) && \
48	    (mgetp->xx == NULL || strcmp(mrefp->xx, mgetp->xx) != 0))
49
50int
51getmntany(FILE *fp, struct mnttab *mgetp, struct mnttab *mrefp)
52{
53	int ret;
54
55	while (
56	    ((ret = _sol_getmntent(fp, mgetp)) == 0) && (
57	    DIFF(mnt_special) || DIFF(mnt_mountp) ||
58	    DIFF(mnt_fstype) || DIFF(mnt_mntopts))) { }
59
60	return (ret);
61}
62
63int
64_sol_getmntent(FILE *fp, struct mnttab *mgetp)
65{
66	struct mntent mntbuf;
67	struct mntent *ret;
68
69	ret = getmntent_r(fp, &mntbuf, buf, BUFSIZE);
70
71	if (ret != NULL) {
72		mgetp->mnt_special = mntbuf.mnt_fsname;
73		mgetp->mnt_mountp = mntbuf.mnt_dir;
74		mgetp->mnt_fstype = mntbuf.mnt_type;
75		mgetp->mnt_mntopts = mntbuf.mnt_opts;
76		return (0);
77	}
78
79	if (feof(fp))
80		return (-1);
81
82	return (MNT_TOOLONG);
83}
84
85static int
86getextmntent_impl(FILE *fp, struct extmnttab *mp, int len)
87{
88	int ret;
89	struct stat64 st;
90
91	ret = _sol_getmntent(fp, (struct mnttab *)mp);
92	if (ret == 0) {
93		if (stat64(mp->mnt_mountp, &st) != 0) {
94			mp->mnt_major = 0;
95			mp->mnt_minor = 0;
96			return (ret);
97		}
98		mp->mnt_major = major(st.st_dev);
99		mp->mnt_minor = minor(st.st_dev);
100	}
101
102	return (ret);
103}
104
105int
106getextmntent(const char *path, struct extmnttab *entry, struct stat64 *statbuf)
107{
108	struct stat64 st;
109	FILE *fp;
110	int match;
111
112	if (strlen(path) >= MAXPATHLEN) {
113		(void) fprintf(stderr, "invalid object; pathname too long\n");
114		return (-1);
115	}
116
117	/*
118	 * Search for the path in /proc/self/mounts. Rather than looking for the
119	 * specific path, which can be fooled by non-standard paths (i.e. ".."
120	 * or "//"), we stat() the path and search for the corresponding
121	 * (major,minor) device pair.
122	 */
123	if (stat64(path, statbuf) != 0) {
124		(void) fprintf(stderr, "cannot open '%s': %s\n",
125		    path, strerror(errno));
126		return (-1);
127	}
128
129
130#ifdef HAVE_SETMNTENT
131	if ((fp = setmntent(MNTTAB, "re")) == NULL) {
132#else
133	if ((fp = fopen(MNTTAB, "re")) == NULL) {
134#endif
135		(void) fprintf(stderr, "cannot open %s\n", MNTTAB);
136		return (-1);
137	}
138
139	/*
140	 * Search for the given (major,minor) pair in the mount table.
141	 */
142
143	match = 0;
144	while (getextmntent_impl(fp, entry, sizeof (*entry)) == 0) {
145		if (makedev(entry->mnt_major, entry->mnt_minor) ==
146		    statbuf->st_dev) {
147			match = 1;
148			break;
149		}
150	}
151	(void) fclose(fp);
152
153	if (!match) {
154		(void) fprintf(stderr, "cannot find mountpoint for '%s'\n",
155		    path);
156		return (-1);
157	}
158
159	if (stat64(entry->mnt_mountp, &st) != 0) {
160		entry->mnt_major = 0;
161		entry->mnt_minor = 0;
162		return (-1);
163	}
164
165	return (0);
166}
167