1 /* $NetBSD: fstab.c,v 1.31 2012/03/13 21:13:34 christos Exp $ */
2
3 /*
4 * Copyright (c) 1980, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: fstab.c,v 1.31 2012/03/13 21:13:34 christos Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include "namespace.h"
42 #include <sys/types.h>
43
44 #include <assert.h>
45 #include <err.h>
46 #include <errno.h>
47 #include <fstab.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52
53 #ifdef __weak_alias
54 __weak_alias(endfsent,_endfsent)
55 __weak_alias(getfsent,_getfsent)
56 __weak_alias(getfsfile,_getfsfile)
57 __weak_alias(getfsspec,_getfsspec)
58 __weak_alias(setfsent,_setfsent)
59 #endif
60
61 static FILE *_fs_fp;
62 static size_t _fs_lineno = 0;
63 static const char *_fs_file = _PATH_FSTAB;
64 static struct fstab _fs_fstab;
65
66 static char *nextfld(char **, const char *);
67 static int fstabscan(void);
68
69
70 static char *
nextfld(char ** str,const char * sep)71 nextfld(char **str, const char *sep)
72 {
73 char *ret;
74
75 _DIAGASSERT(str != NULL);
76 _DIAGASSERT(sep != NULL);
77
78 while ((ret = stresep(str, sep, '\\')) != NULL && *ret == '\0')
79 continue;
80 return ret;
81 }
82
83
84 static int
fstabscan(void)85 fstabscan(void)
86 {
87 char *cp, *lp, *sp;
88 #define MAXLINELENGTH 1024
89 static char line[MAXLINELENGTH];
90 char subline[MAXLINELENGTH];
91 static const char sep[] = ":\n";
92 static const char ws[] = " \t\n";
93 static const char *fstab_type[] = {
94 FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_DP, FSTAB_XX, NULL
95 };
96
97 (void)memset(&_fs_fstab, 0, sizeof(_fs_fstab));
98 for (;;) {
99 if (!(lp = fgets(line, (int)sizeof(line), _fs_fp)))
100 return 0;
101 _fs_lineno++;
102 /* OLD_STYLE_FSTAB */
103 if (!strpbrk(lp, " \t")) {
104 _fs_fstab.fs_spec = nextfld(&lp, sep);
105 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
106 continue;
107 _fs_fstab.fs_file = nextfld(&lp, sep);
108 _fs_fstab.fs_type = nextfld(&lp, sep);
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 __UNCONST(
115 strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
116 "ufs" : "swap");
117 if ((cp = nextfld(&lp, sep)) != NULL) {
118 _fs_fstab.fs_freq = atoi(cp);
119 if ((cp = nextfld(&lp, sep)) != NULL) {
120 _fs_fstab.fs_passno = atoi(cp);
121 return 1;
122 }
123 }
124 }
125 goto bad;
126 }
127 /* OLD_STYLE_FSTAB */
128 _fs_fstab.fs_spec = nextfld(&lp, ws);
129 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
130 continue;
131 _fs_fstab.fs_file = nextfld(&lp, ws);
132 _fs_fstab.fs_vfstype = nextfld(&lp, ws);
133 _fs_fstab.fs_mntops = nextfld(&lp, ws);
134 if (_fs_fstab.fs_mntops == NULL)
135 goto bad;
136 _fs_fstab.fs_freq = 0;
137 _fs_fstab.fs_passno = 0;
138 if ((cp = nextfld(&lp, ws)) != NULL) {
139 _fs_fstab.fs_freq = atoi(cp);
140 if ((cp = nextfld(&lp, ws)) != NULL)
141 _fs_fstab.fs_passno = atoi(cp);
142 }
143
144 /* subline truncated iff line truncated */
145 (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline));
146 sp = subline;
147
148 while ((cp = nextfld(&sp, ",")) != NULL) {
149 const char **tp;
150
151 if (strlen(cp) != 2)
152 continue;
153
154 for (tp = fstab_type; *tp; tp++)
155 if (strcmp(cp, *tp) == 0) {
156 _fs_fstab.fs_type = __UNCONST(*tp);
157 break;
158 }
159 if (*tp)
160 break;
161 }
162 if (_fs_fstab.fs_type == NULL)
163 goto bad;
164 if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0)
165 continue;
166 if (cp != NULL)
167 return 1;
168
169 bad:
170 warnx("%s, %lu: Missing fields", _fs_file, (u_long)_fs_lineno);
171 }
172 /* NOTREACHED */
173 }
174
175 struct fstab *
getfsent(void)176 getfsent(void)
177 {
178 if ((!_fs_fp && !setfsent()) || !fstabscan())
179 return NULL;
180 return &_fs_fstab;
181 }
182
183 struct fstab *
getfsspec(const char * name)184 getfsspec(const char *name)
185 {
186
187 _DIAGASSERT(name != NULL);
188
189 if (setfsent())
190 while (fstabscan())
191 if (!strcmp(_fs_fstab.fs_spec, name))
192 return &_fs_fstab;
193 return NULL;
194 }
195
196 struct fstab *
getfsfile(const char * name)197 getfsfile(const char *name)
198 {
199
200 _DIAGASSERT(name != NULL);
201
202 if (setfsent())
203 while (fstabscan())
204 if (!strcmp(_fs_fstab.fs_file, name))
205 return &_fs_fstab;
206 return NULL;
207 }
208
209 int
setfsent(void)210 setfsent(void)
211 {
212 _fs_lineno = 0;
213 if (_fs_fp) {
214 rewind(_fs_fp);
215 return 1;
216 }
217 if ((_fs_fp = fopen(_PATH_FSTAB, "re")) == NULL) {
218 warn("Cannot open `%s'", _PATH_FSTAB);
219 return 0;
220 }
221 return 1;
222 }
223
224 void
endfsent(void)225 endfsent(void)
226 {
227 if (_fs_fp) {
228 (void)fclose(_fs_fp);
229 _fs_fp = NULL;
230 }
231 }
232