fstab.c revision 90045 
1/*
2 * Copyright (c) 1980, 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)fstab.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/gen/fstab.c 90045 2002-02-01 01:32:19Z obrien $");
39
40#include "namespace.h"
41#include <sys/param.h>
42#include <sys/mount.h>
43#include <sys/stat.h>
44
45#include <errno.h>
46#include <fstab.h>
47#include <paths.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52#include "un-namespace.h"
53
54static FILE *_fs_fp;
55static struct fstab _fs_fstab;
56static int LineNo = 0;
57
58static void error(int);
59static void fixfsfile(void);
60static int fstabscan(void);
61
62static void
63fixfsfile()
64{
65	static char buf[sizeof(_PATH_DEV) + MNAMELEN];
66	struct stat sb;
67	struct statfs sf;
68
69	if (strcmp(_fs_fstab.fs_file, "/") != 0)
70		return;
71	if (statfs("/", &sf) != 0)
72		return;
73	if (sf.f_mntfromname[0] == '/')
74		buf[0] = '\0';
75	else
76		strcpy(buf, _PATH_DEV);
77	strcat(buf, sf.f_mntfromname);
78	if (stat(buf, &sb) != 0 ||
79	    (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode)))
80		return;
81	_fs_fstab.fs_spec = buf;
82}
83
84static int
85fstabscan()
86{
87	char *cp, *p;
88#define	MAXLINELENGTH	1024
89	static char line[MAXLINELENGTH];
90	char subline[MAXLINELENGTH];
91	int typexx;
92
93	for (;;) {
94
95		if (!(p = fgets(line, sizeof(line), _fs_fp)))
96			return(0);
97/* OLD_STYLE_FSTAB */
98		++LineNo;
99		if (*line == '#' || *line == '\n')
100			continue;
101		if (!strpbrk(p, " \t")) {
102			_fs_fstab.fs_spec = strsep(&p, ":\n");
103			_fs_fstab.fs_file = strsep(&p, ":\n");
104			fixfsfile();
105			_fs_fstab.fs_type = strsep(&p, ":\n");
106			if (_fs_fstab.fs_type) {
107				if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
108					continue;
109				_fs_fstab.fs_mntops = _fs_fstab.fs_type;
110				_fs_fstab.fs_vfstype =
111				    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
112				    "ufs" : "swap";
113				if ((cp = strsep(&p, ":\n")) != NULL) {
114					_fs_fstab.fs_freq = atoi(cp);
115					if ((cp = strsep(&p, ":\n")) != NULL) {
116						_fs_fstab.fs_passno = atoi(cp);
117						return(1);
118					}
119				}
120			}
121			goto bad;
122		}
123/* OLD_STYLE_FSTAB */
124		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
125			;
126		_fs_fstab.fs_spec = cp;
127		if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
128			continue;
129		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
130			;
131		_fs_fstab.fs_file = cp;
132		fixfsfile();
133		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
134			;
135		_fs_fstab.fs_vfstype = cp;
136		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
137			;
138		_fs_fstab.fs_mntops = cp;
139		if (_fs_fstab.fs_mntops == NULL)
140			goto bad;
141		_fs_fstab.fs_freq = 0;
142		_fs_fstab.fs_passno = 0;
143		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
144			;
145		if (cp != NULL) {
146			_fs_fstab.fs_freq = atoi(cp);
147			while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
148				;
149			if (cp != NULL)
150				_fs_fstab.fs_passno = atoi(cp);
151		}
152		strcpy(subline, _fs_fstab.fs_mntops);
153		p = subline;
154		for (typexx = 0, cp = strsep(&p, ","); cp;
155		     cp = strsep(&p, ",")) {
156			if (strlen(cp) != 2)
157				continue;
158			if (!strcmp(cp, FSTAB_RW)) {
159				_fs_fstab.fs_type = FSTAB_RW;
160				break;
161			}
162			if (!strcmp(cp, FSTAB_RQ)) {
163				_fs_fstab.fs_type = FSTAB_RQ;
164				break;
165			}
166			if (!strcmp(cp, FSTAB_RO)) {
167				_fs_fstab.fs_type = FSTAB_RO;
168				break;
169			}
170			if (!strcmp(cp, FSTAB_SW)) {
171				_fs_fstab.fs_type = FSTAB_SW;
172				break;
173			}
174			if (!strcmp(cp, FSTAB_XX)) {
175				_fs_fstab.fs_type = FSTAB_XX;
176				typexx++;
177				break;
178			}
179		}
180		if (typexx)
181			continue;
182		if (cp != NULL)
183			return(1);
184
185bad:		/* no way to distinguish between EOF and syntax error */
186		error(EFTYPE);
187	}
188	/* NOTREACHED */
189}
190
191struct fstab *
192getfsent()
193{
194	if ((!_fs_fp && !setfsent()) || !fstabscan())
195		return((struct fstab *)NULL);
196	return(&_fs_fstab);
197}
198
199struct fstab *
200getfsspec(name)
201	const char *name;
202{
203	if (setfsent())
204		while (fstabscan())
205			if (!strcmp(_fs_fstab.fs_spec, name))
206				return(&_fs_fstab);
207	return((struct fstab *)NULL);
208}
209
210struct fstab *
211getfsfile(name)
212	const char *name;
213{
214	if (setfsent())
215		while (fstabscan())
216			if (!strcmp(_fs_fstab.fs_file, name))
217				return(&_fs_fstab);
218	return((struct fstab *)NULL);
219}
220
221int
222setfsent()
223{
224	if (_fs_fp) {
225		rewind(_fs_fp);
226		LineNo = 0;
227		return(1);
228	}
229	if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) {
230		LineNo = 0;
231		return(1);
232	}
233	error(errno);
234	return(0);
235}
236
237void
238endfsent()
239{
240	if (_fs_fp) {
241		(void)fclose(_fs_fp);
242		_fs_fp = NULL;
243	}
244}
245
246static void
247error(err)
248	int err;
249{
250	char *p;
251	char num[30];
252
253	(void)_write(STDERR_FILENO, "fstab: ", 7);
254	(void)_write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
255	(void)_write(STDERR_FILENO, ":", 1);
256	sprintf(num, "%d: ", LineNo);
257	(void)_write(STDERR_FILENO, num, strlen(num));
258	p = strerror(err);
259	(void)_write(STDERR_FILENO, p, strlen(p));
260	(void)_write(STDERR_FILENO, "\n", 1);
261}
262