1 /* 2 * Copyright (c) 1980, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 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 <fcntl.h> 43 #include <fstab.h> 44 #include <paths.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <vis.h> 50 #include "un-namespace.h" 51 52 static FILE *_fs_fp; 53 static struct fstab _fs_fstab; 54 static int LineNo = 0; 55 static char *path_fstab; 56 static char fstab_path[PATH_MAX]; 57 static int fsp_set = 0; 58 59 static void error(int); 60 static void fixfsfile(void); 61 static int fstabscan(void); 62 63 void 64 setfstab(const char *file) 65 { 66 67 if (file == NULL) { 68 path_fstab = _PATH_FSTAB; 69 } else { 70 strncpy(fstab_path, file, PATH_MAX); 71 fstab_path[PATH_MAX - 1] = '\0'; 72 path_fstab = fstab_path; 73 } 74 fsp_set = 1; 75 76 return; 77 } 78 79 const char * 80 getfstab(void) 81 { 82 83 if (fsp_set) 84 return (path_fstab); 85 else 86 return (_PATH_FSTAB); 87 } 88 89 static void 90 fixfsfile(void) 91 { 92 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 93 struct stat sb; 94 struct statfs sf; 95 96 if (_fs_fstab.fs_file != NULL && strcmp(_fs_fstab.fs_file, "/") != 0) 97 return; 98 if (statfs("/", &sf) != 0) 99 return; 100 if (sf.f_mntfromname[0] == '/') 101 buf[0] = '\0'; 102 else 103 strcpy(buf, _PATH_DEV); 104 strcat(buf, sf.f_mntfromname); 105 if (stat(buf, &sb) != 0 || 106 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 107 return; 108 _fs_fstab.fs_spec = buf; 109 } 110 111 static int 112 fstabscan(void) 113 { 114 char *cp, *p; 115 #define MAXLINELENGTH 1024 116 static char line[MAXLINELENGTH]; 117 char subline[MAXLINELENGTH]; 118 int typexx; 119 120 for (;;) { 121 122 if (!(p = fgets(line, sizeof(line), _fs_fp))) 123 return (0); 124 /* OLD_STYLE_FSTAB */ 125 ++LineNo; 126 if (*line == '#' || *line == '\n') 127 continue; 128 if (!strpbrk(p, " \t")) { 129 _fs_fstab.fs_spec = strsep(&p, ":\n"); 130 _fs_fstab.fs_file = strsep(&p, ":\n"); 131 fixfsfile(); 132 _fs_fstab.fs_type = strsep(&p, ":\n"); 133 if (_fs_fstab.fs_type) { 134 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 135 continue; 136 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 137 _fs_fstab.fs_vfstype = 138 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 139 "ufs" : "swap"; 140 if ((cp = strsep(&p, ":\n")) != NULL) { 141 _fs_fstab.fs_freq = atoi(cp); 142 if ((cp = strsep(&p, ":\n")) != NULL) { 143 _fs_fstab.fs_passno = atoi(cp); 144 return (1); 145 } 146 } 147 } 148 goto bad; 149 } 150 /* OLD_STYLE_FSTAB */ 151 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 152 ; 153 _fs_fstab.fs_spec = cp; 154 if (_fs_fstab.fs_spec == NULL || *_fs_fstab.fs_spec == '#') 155 continue; 156 if (strunvis(_fs_fstab.fs_spec, _fs_fstab.fs_spec) < 0) 157 goto bad; 158 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 159 ; 160 _fs_fstab.fs_file = cp; 161 if (_fs_fstab.fs_file == NULL) 162 goto bad; 163 if (strunvis(_fs_fstab.fs_file, _fs_fstab.fs_file) < 0) 164 goto bad; 165 fixfsfile(); 166 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 167 ; 168 _fs_fstab.fs_vfstype = cp; 169 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 170 ; 171 _fs_fstab.fs_mntops = cp; 172 if (_fs_fstab.fs_mntops == NULL) 173 goto bad; 174 _fs_fstab.fs_freq = 0; 175 _fs_fstab.fs_passno = 0; 176 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 177 ; 178 if (cp != NULL) { 179 _fs_fstab.fs_freq = atoi(cp); 180 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 181 ; 182 if (cp != NULL) 183 _fs_fstab.fs_passno = atoi(cp); 184 } 185 strcpy(subline, _fs_fstab.fs_mntops); 186 p = subline; 187 for (typexx = 0, cp = strsep(&p, ","); cp; 188 cp = strsep(&p, ",")) { 189 if (strlen(cp) != 2) 190 continue; 191 if (!strcmp(cp, FSTAB_RW)) { 192 _fs_fstab.fs_type = FSTAB_RW; 193 break; 194 } 195 if (!strcmp(cp, FSTAB_RQ)) { 196 _fs_fstab.fs_type = FSTAB_RQ; 197 break; 198 } 199 if (!strcmp(cp, FSTAB_RO)) { 200 _fs_fstab.fs_type = FSTAB_RO; 201 break; 202 } 203 if (!strcmp(cp, FSTAB_SW)) { 204 _fs_fstab.fs_type = FSTAB_SW; 205 break; 206 } 207 if (!strcmp(cp, FSTAB_XX)) { 208 _fs_fstab.fs_type = FSTAB_XX; 209 typexx++; 210 break; 211 } 212 } 213 if (typexx) 214 continue; 215 if (cp != NULL) 216 return (1); 217 218 bad: /* no way to distinguish between EOF and syntax error */ 219 error(EFTYPE); 220 } 221 /* NOTREACHED */ 222 } 223 224 struct fstab * 225 getfsent(void) 226 { 227 228 if ((!_fs_fp && !setfsent()) || !fstabscan()) 229 return (NULL); 230 return (&_fs_fstab); 231 } 232 233 struct fstab * 234 getfsspec(const char *name) 235 { 236 237 if (setfsent()) 238 while (fstabscan()) 239 if (!strcmp(_fs_fstab.fs_spec, name)) 240 return (&_fs_fstab); 241 return (NULL); 242 } 243 244 struct fstab * 245 getfsfile(const char *name) 246 { 247 248 if (setfsent()) 249 while (fstabscan()) 250 if (!strcmp(_fs_fstab.fs_file, name)) 251 return (&_fs_fstab); 252 return (NULL); 253 } 254 255 int 256 setfsent(void) 257 { 258 int fd; 259 260 if (_fs_fp) { 261 rewind(_fs_fp); 262 LineNo = 0; 263 return (1); 264 } 265 if (fsp_set == 0) { 266 if (issetugid()) 267 setfstab(NULL); 268 else 269 setfstab(getenv("PATH_FSTAB")); 270 } 271 fd = _open(path_fstab, O_RDONLY | O_CLOEXEC); 272 if (fd == -1) { 273 error(errno); 274 return (0); 275 } 276 _fs_fp = fdopen(fd, "r"); 277 if (_fs_fp != NULL) { 278 LineNo = 0; 279 return (1); 280 } 281 error(errno); 282 _close(fd); 283 return (0); 284 } 285 286 void 287 endfsent(void) 288 { 289 290 if (_fs_fp) { 291 (void)fclose(_fs_fp); 292 _fs_fp = NULL; 293 } 294 295 fsp_set = 0; 296 } 297 298 static void 299 error(int err) 300 { 301 char *p; 302 char num[30]; 303 304 (void)_write(STDERR_FILENO, "fstab: ", 7); 305 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab)); 306 (void)_write(STDERR_FILENO, ":", 1); 307 sprintf(num, "%d: ", LineNo); 308 (void)_write(STDERR_FILENO, num, strlen(num)); 309 p = strerror(err); 310 (void)_write(STDERR_FILENO, p, strlen(p)); 311 (void)_write(STDERR_FILENO, "\n", 1); 312 } 313