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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 #include <sys/mount.h> 41 #include <sys/stat.h> 42 43 #include <errno.h> 44 #include <fstab.h> 45 #include <paths.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include <vis.h> 51 #include "un-namespace.h" 52 53 static FILE *_fs_fp; 54 static struct fstab _fs_fstab; 55 static int LineNo = 0; 56 static char *path_fstab; 57 static char fstab_path[PATH_MAX]; 58 static int fsp_set = 0; 59 60 static void error(int); 61 static void fixfsfile(void); 62 static int fstabscan(void); 63 64 void 65 setfstab(const char *file) 66 { 67 68 if (file == NULL) { 69 path_fstab = _PATH_FSTAB; 70 } else { 71 strncpy(fstab_path, file, PATH_MAX); 72 fstab_path[PATH_MAX - 1] = '\0'; 73 path_fstab = fstab_path; 74 } 75 fsp_set = 1; 76 77 return; 78 } 79 80 const char * 81 getfstab(void) 82 { 83 84 if (fsp_set) 85 return (path_fstab); 86 else 87 return (_PATH_FSTAB); 88 } 89 90 static void 91 fixfsfile(void) 92 { 93 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 94 struct stat sb; 95 struct statfs sf; 96 97 if (_fs_fstab.fs_file != NULL && strcmp(_fs_fstab.fs_file, "/") != 0) 98 return; 99 if (statfs("/", &sf) != 0) 100 return; 101 if (sf.f_mntfromname[0] == '/') 102 buf[0] = '\0'; 103 else 104 strcpy(buf, _PATH_DEV); 105 strcat(buf, sf.f_mntfromname); 106 if (stat(buf, &sb) != 0 || 107 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 108 return; 109 _fs_fstab.fs_spec = buf; 110 } 111 112 static int 113 fstabscan(void) 114 { 115 char *cp, *p; 116 #define MAXLINELENGTH 1024 117 static char line[MAXLINELENGTH]; 118 char subline[MAXLINELENGTH]; 119 int typexx; 120 121 for (;;) { 122 123 if (!(p = fgets(line, sizeof(line), _fs_fp))) 124 return (0); 125 /* OLD_STYLE_FSTAB */ 126 ++LineNo; 127 if (*line == '#' || *line == '\n') 128 continue; 129 if (!strpbrk(p, " \t")) { 130 _fs_fstab.fs_spec = strsep(&p, ":\n"); 131 _fs_fstab.fs_file = strsep(&p, ":\n"); 132 fixfsfile(); 133 _fs_fstab.fs_type = strsep(&p, ":\n"); 134 if (_fs_fstab.fs_type) { 135 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 136 continue; 137 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 138 _fs_fstab.fs_vfstype = 139 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 140 "ufs" : "swap"; 141 if ((cp = strsep(&p, ":\n")) != NULL) { 142 _fs_fstab.fs_freq = atoi(cp); 143 if ((cp = strsep(&p, ":\n")) != NULL) { 144 _fs_fstab.fs_passno = atoi(cp); 145 return (1); 146 } 147 } 148 } 149 goto bad; 150 } 151 /* OLD_STYLE_FSTAB */ 152 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 153 ; 154 _fs_fstab.fs_spec = cp; 155 if (_fs_fstab.fs_spec == NULL || *_fs_fstab.fs_spec == '#') 156 continue; 157 if (strunvis(_fs_fstab.fs_spec, _fs_fstab.fs_spec) < 0) 158 goto bad; 159 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 160 ; 161 _fs_fstab.fs_file = cp; 162 if (_fs_fstab.fs_file == NULL) 163 goto bad; 164 if (strunvis(_fs_fstab.fs_file, _fs_fstab.fs_file) < 0) 165 goto bad; 166 fixfsfile(); 167 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 168 ; 169 _fs_fstab.fs_vfstype = cp; 170 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 171 ; 172 _fs_fstab.fs_mntops = cp; 173 if (_fs_fstab.fs_mntops == NULL) 174 goto bad; 175 _fs_fstab.fs_freq = 0; 176 _fs_fstab.fs_passno = 0; 177 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 178 ; 179 if (cp != NULL) { 180 _fs_fstab.fs_freq = atoi(cp); 181 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 182 ; 183 if (cp != NULL) 184 _fs_fstab.fs_passno = atoi(cp); 185 } 186 (void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline)); 187 p = subline; 188 for (typexx = 0, cp = strsep(&p, ","); cp; 189 cp = strsep(&p, ",")) { 190 if (strlen(cp) != 2) 191 continue; 192 if (!strcmp(cp, FSTAB_RW)) { 193 _fs_fstab.fs_type = FSTAB_RW; 194 break; 195 } 196 if (!strcmp(cp, FSTAB_RQ)) { 197 _fs_fstab.fs_type = FSTAB_RQ; 198 break; 199 } 200 if (!strcmp(cp, FSTAB_RO)) { 201 _fs_fstab.fs_type = FSTAB_RO; 202 break; 203 } 204 if (!strcmp(cp, FSTAB_SW)) { 205 _fs_fstab.fs_type = FSTAB_SW; 206 break; 207 } 208 if (!strcmp(cp, FSTAB_XX)) { 209 _fs_fstab.fs_type = FSTAB_XX; 210 typexx++; 211 break; 212 } 213 } 214 if (typexx) 215 continue; 216 if (cp != NULL) 217 return (1); 218 219 bad: /* no way to distinguish between EOF and syntax error */ 220 error(EFTYPE); 221 } 222 /* NOTREACHED */ 223 } 224 225 struct fstab * 226 getfsent(void) 227 { 228 229 if ((!_fs_fp && !setfsent()) || !fstabscan()) 230 return (NULL); 231 return (&_fs_fstab); 232 } 233 234 struct fstab * 235 getfsspec(const char *name) 236 { 237 238 if (setfsent()) 239 while (fstabscan()) 240 if (!strcmp(_fs_fstab.fs_spec, name)) 241 return (&_fs_fstab); 242 return (NULL); 243 } 244 245 struct fstab * 246 getfsfile(const char *name) 247 { 248 249 if (setfsent()) 250 while (fstabscan()) 251 if (!strcmp(_fs_fstab.fs_file, name)) 252 return (&_fs_fstab); 253 return (NULL); 254 } 255 256 int 257 setfsent(void) 258 { 259 if (_fs_fp) { 260 rewind(_fs_fp); 261 LineNo = 0; 262 return (1); 263 } 264 if (fsp_set == 0) { 265 if (issetugid()) 266 setfstab(NULL); 267 else 268 setfstab(getenv("PATH_FSTAB")); 269 } 270 if ((_fs_fp = fopen(path_fstab, "re")) != NULL) { 271 LineNo = 0; 272 return (1); 273 } 274 error(errno); 275 return (0); 276 } 277 278 void 279 endfsent(void) 280 { 281 282 if (_fs_fp) { 283 (void)fclose(_fs_fp); 284 _fs_fp = NULL; 285 } 286 287 fsp_set = 0; 288 } 289 290 static void 291 error(int err) 292 { 293 char *p; 294 char num[30]; 295 296 (void)_write(STDERR_FILENO, "fstab: ", 7); 297 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab)); 298 (void)_write(STDERR_FILENO, ":", 1); 299 sprintf(num, "%d: ", LineNo); 300 (void)_write(STDERR_FILENO, num, strlen(num)); 301 p = strerror(err); 302 (void)_write(STDERR_FILENO, p, strlen(p)); 303 (void)_write(STDERR_FILENO, "\n", 1); 304 } 305