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 __FBSDID("$FreeBSD$"); 35 36 #include "namespace.h" 37 #include <sys/param.h> 38 #include <sys/mount.h> 39 #include <sys/stat.h> 40 41 #include <errno.h> 42 #include <fstab.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include <vis.h> 49 #include "un-namespace.h" 50 51 static FILE *_fs_fp; 52 static struct fstab _fs_fstab; 53 static int LineNo = 0; 54 static char *path_fstab; 55 static char fstab_path[PATH_MAX]; 56 static int fsp_set = 0; 57 58 static void error(int); 59 static void fixfsfile(void); 60 static int fstabscan(void); 61 62 void 63 setfstab(const char *file) 64 { 65 66 if (file == NULL) { 67 path_fstab = _PATH_FSTAB; 68 } else { 69 strncpy(fstab_path, file, PATH_MAX); 70 fstab_path[PATH_MAX - 1] = '\0'; 71 path_fstab = fstab_path; 72 } 73 fsp_set = 1; 74 75 return; 76 } 77 78 const char * 79 getfstab(void) 80 { 81 82 if (fsp_set) 83 return (path_fstab); 84 else 85 return (_PATH_FSTAB); 86 } 87 88 static void 89 fixfsfile(void) 90 { 91 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 92 struct stat sb; 93 struct statfs sf; 94 95 if (_fs_fstab.fs_file != NULL && strcmp(_fs_fstab.fs_file, "/") != 0) 96 return; 97 if (statfs("/", &sf) != 0) 98 return; 99 if (sf.f_mntfromname[0] == '/') 100 buf[0] = '\0'; 101 else 102 strcpy(buf, _PATH_DEV); 103 strcat(buf, sf.f_mntfromname); 104 if (stat(buf, &sb) != 0 || 105 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 106 return; 107 _fs_fstab.fs_spec = buf; 108 } 109 110 static int 111 fstabscan(void) 112 { 113 char *cp, *p; 114 #define MAXLINELENGTH 1024 115 static char line[MAXLINELENGTH]; 116 char subline[MAXLINELENGTH]; 117 int typexx; 118 119 for (;;) { 120 121 if (!(p = fgets(line, sizeof(line), _fs_fp))) 122 return (0); 123 /* OLD_STYLE_FSTAB */ 124 ++LineNo; 125 if (*line == '#' || *line == '\n') 126 continue; 127 if (!strpbrk(p, " \t")) { 128 _fs_fstab.fs_spec = strsep(&p, ":\n"); 129 _fs_fstab.fs_file = strsep(&p, ":\n"); 130 fixfsfile(); 131 _fs_fstab.fs_type = strsep(&p, ":\n"); 132 if (_fs_fstab.fs_type) { 133 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 134 continue; 135 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 136 _fs_fstab.fs_vfstype = 137 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 138 "ufs" : "swap"; 139 if ((cp = strsep(&p, ":\n")) != NULL) { 140 _fs_fstab.fs_freq = atoi(cp); 141 if ((cp = strsep(&p, ":\n")) != NULL) { 142 _fs_fstab.fs_passno = atoi(cp); 143 return (1); 144 } 145 } 146 } 147 goto bad; 148 } 149 /* OLD_STYLE_FSTAB */ 150 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 151 ; 152 _fs_fstab.fs_spec = cp; 153 if (_fs_fstab.fs_spec == NULL || *_fs_fstab.fs_spec == '#') 154 continue; 155 if (strunvis(_fs_fstab.fs_spec, _fs_fstab.fs_spec) < 0) 156 goto bad; 157 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 158 ; 159 _fs_fstab.fs_file = cp; 160 if (_fs_fstab.fs_file == NULL) 161 goto bad; 162 if (strunvis(_fs_fstab.fs_file, _fs_fstab.fs_file) < 0) 163 goto bad; 164 fixfsfile(); 165 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 166 ; 167 _fs_fstab.fs_vfstype = cp; 168 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 169 ; 170 _fs_fstab.fs_mntops = cp; 171 if (_fs_fstab.fs_mntops == NULL) 172 goto bad; 173 _fs_fstab.fs_freq = 0; 174 _fs_fstab.fs_passno = 0; 175 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 176 ; 177 if (cp != NULL) { 178 _fs_fstab.fs_freq = atoi(cp); 179 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 180 ; 181 if (cp != NULL) 182 _fs_fstab.fs_passno = atoi(cp); 183 } 184 (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline)); 185 p = subline; 186 for (typexx = 0, cp = strsep(&p, ","); cp; 187 cp = strsep(&p, ",")) { 188 if (strlen(cp) != 2) 189 continue; 190 if (!strcmp(cp, FSTAB_RW)) { 191 _fs_fstab.fs_type = FSTAB_RW; 192 break; 193 } 194 if (!strcmp(cp, FSTAB_RQ)) { 195 _fs_fstab.fs_type = FSTAB_RQ; 196 break; 197 } 198 if (!strcmp(cp, FSTAB_RO)) { 199 _fs_fstab.fs_type = FSTAB_RO; 200 break; 201 } 202 if (!strcmp(cp, FSTAB_SW)) { 203 _fs_fstab.fs_type = FSTAB_SW; 204 break; 205 } 206 if (!strcmp(cp, FSTAB_XX)) { 207 _fs_fstab.fs_type = FSTAB_XX; 208 typexx++; 209 break; 210 } 211 } 212 if (typexx) 213 continue; 214 if (cp != NULL) 215 return (1); 216 217 bad: /* no way to distinguish between EOF and syntax error */ 218 error(EFTYPE); 219 } 220 /* NOTREACHED */ 221 } 222 223 struct fstab * 224 getfsent(void) 225 { 226 227 if ((!_fs_fp && !setfsent()) || !fstabscan()) 228 return (NULL); 229 return (&_fs_fstab); 230 } 231 232 struct fstab * 233 getfsspec(const char *name) 234 { 235 236 if (setfsent()) 237 while (fstabscan()) 238 if (!strcmp(_fs_fstab.fs_spec, name)) 239 return (&_fs_fstab); 240 return (NULL); 241 } 242 243 struct fstab * 244 getfsfile(const char *name) 245 { 246 247 if (setfsent()) 248 while (fstabscan()) 249 if (!strcmp(_fs_fstab.fs_file, name)) 250 return (&_fs_fstab); 251 return (NULL); 252 } 253 254 int 255 setfsent(void) 256 { 257 if (_fs_fp) { 258 rewind(_fs_fp); 259 LineNo = 0; 260 return (1); 261 } 262 if (fsp_set == 0) { 263 if (issetugid()) 264 setfstab(NULL); 265 else 266 setfstab(getenv("PATH_FSTAB")); 267 } 268 if ((_fs_fp = fopen(path_fstab, "re")) != NULL) { 269 LineNo = 0; 270 return (1); 271 } 272 error(errno); 273 return (0); 274 } 275 276 void 277 endfsent(void) 278 { 279 280 if (_fs_fp) { 281 (void)fclose(_fs_fp); 282 _fs_fp = NULL; 283 } 284 285 fsp_set = 0; 286 } 287 288 static void 289 error(int err) 290 { 291 char *p; 292 char num[30]; 293 294 (void)_write(STDERR_FILENO, "fstab: ", 7); 295 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab)); 296 (void)_write(STDERR_FILENO, ":", 1); 297 sprintf(num, "%d: ", LineNo); 298 (void)_write(STDERR_FILENO, num, strlen(num)); 299 p = strerror(err); 300 (void)_write(STDERR_FILENO, p, strlen(p)); 301 (void)_write(STDERR_FILENO, "\n", 1); 302 } 303