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