fstab.c revision 84768 
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)
35#if 0
36static char sccsid[] = "@(#)fstab.c	8.1 (Berkeley) 6/4/93";
37#else
38static char rcsid[] =
39 "$FreeBSD: head/lib/libc/gen/fstab.c 84768 2001-10-10 17:48:44Z bde $";
40#endif
41#endif /* LIBC_SCCS and not lint */
42
43#include "namespace.h"
44#include <sys/param.h>
45#include <sys/mount.h>
46#include <sys/stat.h>
47
48#include <errno.h>
49#include <fstab.h>
50#include <paths.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <string.h>
54#include <unistd.h>
55#include "un-namespace.h"
56
57static FILE *_fs_fp;
58static struct fstab _fs_fstab;
59static int LineNo = 0;
60
61static void error __P((int));
62static void fixfsfile __P((void));
63static int fstabscan __P((void));
64
65static void
66fixfsfile()
67{
68	static char buf[sizeof(_PATH_DEV) + MNAMELEN];
69	struct stat sb;
70	struct statfs sf;
71
72	if (strcmp(_fs_fstab.fs_file, "/") != 0)
73		return;
74	if (statfs("/", &sf) != 0)
75		return;
76	if (sf.f_mntfromname[0] == '/')
77		buf[0] = '\0';
78	else
79		strcpy(buf, _PATH_DEV);
80	strcat(buf, sf.f_mntfromname);
81	if (stat(buf, &sb) != 0 ||
82	    (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode)))
83		return;
84	_fs_fstab.fs_spec = buf;
85}
86
87static int
88fstabscan()
89{
90	char *cp, *p;
91#define	MAXLINELENGTH	1024
92	static char line[MAXLINELENGTH];
93	char subline[MAXLINELENGTH];
94	int typexx;
95
96	for (;;) {
97
98		if (!(p = fgets(line, sizeof(line), _fs_fp)))
99			return(0);
100/* OLD_STYLE_FSTAB */
101		++LineNo;
102		if (*line == '#' || *line == '\n')
103			continue;
104		if (!strpbrk(p, " \t")) {
105			_fs_fstab.fs_spec = strsep(&p, ":\n");
106			_fs_fstab.fs_file = strsep(&p, ":\n");
107			fixfsfile();
108			_fs_fstab.fs_type = strsep(&p, ":\n");
109			if (_fs_fstab.fs_type) {
110				if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
111					continue;
112				_fs_fstab.fs_mntops = _fs_fstab.fs_type;
113				_fs_fstab.fs_vfstype =
114				    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
115				    "ufs" : "swap";
116				if ((cp = strsep(&p, ":\n")) != NULL) {
117					_fs_fstab.fs_freq = atoi(cp);
118					if ((cp = strsep(&p, ":\n")) != NULL) {
119						_fs_fstab.fs_passno = atoi(cp);
120						return(1);
121					}
122				}
123			}
124			goto bad;
125		}
126/* OLD_STYLE_FSTAB */
127		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
128			;
129		_fs_fstab.fs_spec = cp;
130		if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
131			continue;
132		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
133			;
134		_fs_fstab.fs_file = cp;
135		fixfsfile();
136		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
137			;
138		_fs_fstab.fs_vfstype = cp;
139		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
140			;
141		_fs_fstab.fs_mntops = cp;
142		if (_fs_fstab.fs_mntops == NULL)
143			goto bad;
144		_fs_fstab.fs_freq = 0;
145		_fs_fstab.fs_passno = 0;
146		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
147			;
148		if (cp != NULL) {
149			_fs_fstab.fs_freq = atoi(cp);
150			while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
151				;
152			if (cp != NULL)
153				_fs_fstab.fs_passno = atoi(cp);
154		}
155		strcpy(subline, _fs_fstab.fs_mntops);
156		p = subline;
157		for (typexx = 0, cp = strsep(&p, ","); cp;
158		     cp = strsep(&p, ",")) {
159			if (strlen(cp) != 2)
160				continue;
161			if (!strcmp(cp, FSTAB_RW)) {
162				_fs_fstab.fs_type = FSTAB_RW;
163				break;
164			}
165			if (!strcmp(cp, FSTAB_RQ)) {
166				_fs_fstab.fs_type = FSTAB_RQ;
167				break;
168			}
169			if (!strcmp(cp, FSTAB_RO)) {
170				_fs_fstab.fs_type = FSTAB_RO;
171				break;
172			}
173			if (!strcmp(cp, FSTAB_SW)) {
174				_fs_fstab.fs_type = FSTAB_SW;
175				break;
176			}
177			if (!strcmp(cp, FSTAB_XX)) {
178				_fs_fstab.fs_type = FSTAB_XX;
179				typexx++;
180				break;
181			}
182		}
183		if (typexx)
184			continue;
185		if (cp != NULL)
186			return(1);
187
188bad:		/* no way to distinguish between EOF and syntax error */
189		error(EFTYPE);
190	}
191	/* NOTREACHED */
192}
193
194struct fstab *
195getfsent()
196{
197	if ((!_fs_fp && !setfsent()) || !fstabscan())
198		return((struct fstab *)NULL);
199	return(&_fs_fstab);
200}
201
202struct fstab *
203getfsspec(name)
204	register const char *name;
205{
206	if (setfsent())
207		while (fstabscan())
208			if (!strcmp(_fs_fstab.fs_spec, name))
209				return(&_fs_fstab);
210	return((struct fstab *)NULL);
211}
212
213struct fstab *
214getfsfile(name)
215	register const char *name;
216{
217	if (setfsent())
218		while (fstabscan())
219			if (!strcmp(_fs_fstab.fs_file, name))
220				return(&_fs_fstab);
221	return((struct fstab *)NULL);
222}
223
224int
225setfsent()
226{
227	if (_fs_fp) {
228		rewind(_fs_fp);
229		LineNo = 0;
230		return(1);
231	}
232	if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) {
233		LineNo = 0;
234		return(1);
235	}
236	error(errno);
237	return(0);
238}
239
240void
241endfsent()
242{
243	if (_fs_fp) {
244		(void)fclose(_fs_fp);
245		_fs_fp = NULL;
246	}
247}
248
249static void
250error(err)
251	int err;
252{
253	char *p;
254	char num[30];
255
256	(void)_write(STDERR_FILENO, "fstab: ", 7);
257	(void)_write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
258	(void)_write(STDERR_FILENO, ":", 1);
259	sprintf(num, "%d: ", LineNo);
260	(void)_write(STDERR_FILENO, num, strlen(num));
261	p = strerror(err);
262	(void)_write(STDERR_FILENO, p, strlen(p));
263	(void)_write(STDERR_FILENO, "\n", 1);
264}
265