1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 __SCCSID("@(#)fstab.c 8.1 (Berkeley) 6/4/93");
34 #include "namespace.h"
35 #include <sys/param.h>
36 #include <sys/mount.h>
37 #include <sys/stat.h>
38
39 #include <errno.h>
40 #include <fstab.h>
41 #include <paths.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 #include <vis.h>
47 #include "un-namespace.h"
48
49 static FILE *_fs_fp;
50 static struct fstab _fs_fstab;
51 static int LineNo = 0;
52 static char *path_fstab;
53 static char fstab_path[PATH_MAX];
54 static int fsp_set = 0;
55
56 static void error(int);
57 static void fixfsfile(void);
58 static int fstabscan(void);
59
60 void
setfstab(const char * file)61 setfstab(const char *file)
62 {
63
64 if (file == NULL) {
65 path_fstab = _PATH_FSTAB;
66 } else {
67 strncpy(fstab_path, file, PATH_MAX);
68 fstab_path[PATH_MAX - 1] = '\0';
69 path_fstab = fstab_path;
70 }
71 fsp_set = 1;
72
73 return;
74 }
75
76 const char *
getfstab(void)77 getfstab(void)
78 {
79
80 if (fsp_set)
81 return (path_fstab);
82 else
83 return (_PATH_FSTAB);
84 }
85
86 static void
fixfsfile(void)87 fixfsfile(void)
88 {
89 static char buf[sizeof(_PATH_DEV) + MNAMELEN];
90 struct stat sb;
91 struct statfs sf;
92
93 if (_fs_fstab.fs_file != NULL && strcmp(_fs_fstab.fs_file, "/") != 0)
94 return;
95 if (statfs("/", &sf) != 0)
96 return;
97 if (sf.f_mntfromname[0] == '/')
98 buf[0] = '\0';
99 else
100 strcpy(buf, _PATH_DEV);
101 strcat(buf, sf.f_mntfromname);
102 if (stat(buf, &sb) != 0 ||
103 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode)))
104 return;
105 _fs_fstab.fs_spec = buf;
106 }
107
108 static int
fstabscan(void)109 fstabscan(void)
110 {
111 char *cp, *p;
112 #define MAXLINELENGTH 1024
113 static char line[MAXLINELENGTH];
114 char subline[MAXLINELENGTH];
115 int typexx;
116
117 for (;;) {
118
119 if (!(p = fgets(line, sizeof(line), _fs_fp)))
120 return (0);
121 /* OLD_STYLE_FSTAB */
122 ++LineNo;
123 if (*line == '#' || *line == '\n')
124 continue;
125 if (!strpbrk(p, " \t")) {
126 _fs_fstab.fs_spec = strsep(&p, ":\n");
127 _fs_fstab.fs_file = strsep(&p, ":\n");
128 fixfsfile();
129 _fs_fstab.fs_type = strsep(&p, ":\n");
130 if (_fs_fstab.fs_type) {
131 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
132 continue;
133 _fs_fstab.fs_mntops = _fs_fstab.fs_type;
134 _fs_fstab.fs_vfstype =
135 strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
136 "ufs" : "swap";
137 if ((cp = strsep(&p, ":\n")) != NULL) {
138 _fs_fstab.fs_freq = atoi(cp);
139 if ((cp = strsep(&p, ":\n")) != NULL) {
140 _fs_fstab.fs_passno = atoi(cp);
141 return (1);
142 }
143 }
144 }
145 goto bad;
146 }
147 /* OLD_STYLE_FSTAB */
148 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
149 ;
150 _fs_fstab.fs_spec = cp;
151 if (_fs_fstab.fs_spec == NULL || *_fs_fstab.fs_spec == '#')
152 continue;
153 if (strunvis(_fs_fstab.fs_spec, _fs_fstab.fs_spec) < 0)
154 goto bad;
155 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
156 ;
157 _fs_fstab.fs_file = cp;
158 if (_fs_fstab.fs_file == NULL)
159 goto bad;
160 if (strunvis(_fs_fstab.fs_file, _fs_fstab.fs_file) < 0)
161 goto bad;
162 fixfsfile();
163 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
164 ;
165 _fs_fstab.fs_vfstype = cp;
166 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
167 ;
168 _fs_fstab.fs_mntops = cp;
169 if (_fs_fstab.fs_mntops == NULL)
170 goto bad;
171 _fs_fstab.fs_freq = 0;
172 _fs_fstab.fs_passno = 0;
173 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
174 ;
175 if (cp != NULL) {
176 _fs_fstab.fs_freq = atoi(cp);
177 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
178 ;
179 if (cp != NULL)
180 _fs_fstab.fs_passno = atoi(cp);
181 }
182 (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline));
183 p = subline;
184 for (typexx = 0, cp = strsep(&p, ","); cp;
185 cp = strsep(&p, ",")) {
186 if (strlen(cp) != 2)
187 continue;
188 if (!strcmp(cp, FSTAB_RW)) {
189 _fs_fstab.fs_type = FSTAB_RW;
190 break;
191 }
192 if (!strcmp(cp, FSTAB_RQ)) {
193 _fs_fstab.fs_type = FSTAB_RQ;
194 break;
195 }
196 if (!strcmp(cp, FSTAB_RO)) {
197 _fs_fstab.fs_type = FSTAB_RO;
198 break;
199 }
200 if (!strcmp(cp, FSTAB_SW)) {
201 _fs_fstab.fs_type = FSTAB_SW;
202 break;
203 }
204 if (!strcmp(cp, FSTAB_XX)) {
205 _fs_fstab.fs_type = FSTAB_XX;
206 typexx++;
207 break;
208 }
209 }
210 if (typexx)
211 continue;
212 if (cp != NULL)
213 return (1);
214
215 bad: /* no way to distinguish between EOF and syntax error */
216 error(EFTYPE);
217 }
218 /* NOTREACHED */
219 }
220
221 struct fstab *
getfsent(void)222 getfsent(void)
223 {
224
225 if ((!_fs_fp && !setfsent()) || !fstabscan())
226 return (NULL);
227 return (&_fs_fstab);
228 }
229
230 struct fstab *
getfsspec(const char * name)231 getfsspec(const char *name)
232 {
233
234 if (setfsent())
235 while (fstabscan())
236 if (!strcmp(_fs_fstab.fs_spec, name))
237 return (&_fs_fstab);
238 return (NULL);
239 }
240
241 struct fstab *
getfsfile(const char * name)242 getfsfile(const char *name)
243 {
244
245 if (setfsent())
246 while (fstabscan())
247 if (!strcmp(_fs_fstab.fs_file, name))
248 return (&_fs_fstab);
249 return (NULL);
250 }
251
252 int
setfsent(void)253 setfsent(void)
254 {
255 if (_fs_fp) {
256 rewind(_fs_fp);
257 LineNo = 0;
258 return (1);
259 }
260 if (fsp_set == 0)
261 setfstab(secure_getenv("PATH_FSTAB"));
262 if ((_fs_fp = fopen(path_fstab, "re")) != NULL) {
263 LineNo = 0;
264 return (1);
265 }
266 error(errno);
267 return (0);
268 }
269
270 void
endfsent(void)271 endfsent(void)
272 {
273
274 if (_fs_fp) {
275 (void)fclose(_fs_fp);
276 _fs_fp = NULL;
277 }
278
279 fsp_set = 0;
280 }
281
282 static void
error(int err)283 error(int err)
284 {
285 char *p;
286 char num[30];
287
288 (void)_write(STDERR_FILENO, "fstab: ", 7);
289 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab));
290 (void)_write(STDERR_FILENO, ":", 1);
291 sprintf(num, "%d: ", LineNo);
292 (void)_write(STDERR_FILENO, num, strlen(num));
293 p = strerror(err);
294 (void)_write(STDERR_FILENO, p, strlen(p));
295 (void)_write(STDERR_FILENO, "\n", 1);
296 }
297