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 if (strunvis(cp, cp) < 0) 154 goto bad; 155 _fs_fstab.fs_spec = cp; 156 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 157 continue; 158 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 159 ; 160 if (strunvis(cp, cp) < 0) 161 goto bad; 162 _fs_fstab.fs_file = cp; 163 fixfsfile(); 164 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 165 ; 166 _fs_fstab.fs_vfstype = cp; 167 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 168 ; 169 _fs_fstab.fs_mntops = cp; 170 if (_fs_fstab.fs_mntops == NULL) 171 goto bad; 172 _fs_fstab.fs_freq = 0; 173 _fs_fstab.fs_passno = 0; 174 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 175 ; 176 if (cp != NULL) { 177 _fs_fstab.fs_freq = atoi(cp); 178 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 179 ; 180 if (cp != NULL) 181 _fs_fstab.fs_passno = atoi(cp); 182 } 183 strcpy(subline, _fs_fstab.fs_mntops); 184 p = subline; 185 for (typexx = 0, cp = strsep(&p, ","); cp; 186 cp = strsep(&p, ",")) { 187 if (strlen(cp) != 2) 188 continue; 189 if (!strcmp(cp, FSTAB_RW)) { 190 _fs_fstab.fs_type = FSTAB_RW; 191 break; 192 } 193 if (!strcmp(cp, FSTAB_RQ)) { 194 _fs_fstab.fs_type = FSTAB_RQ; 195 break; 196 } 197 if (!strcmp(cp, FSTAB_RO)) { 198 _fs_fstab.fs_type = FSTAB_RO; 199 break; 200 } 201 if (!strcmp(cp, FSTAB_SW)) { 202 _fs_fstab.fs_type = FSTAB_SW; 203 break; 204 } 205 if (!strcmp(cp, FSTAB_XX)) { 206 _fs_fstab.fs_type = FSTAB_XX; 207 typexx++; 208 break; 209 } 210 } 211 if (typexx) 212 continue; 213 if (cp != NULL) 214 return (1); 215 216 bad: /* no way to distinguish between EOF and syntax error */ 217 error(EFTYPE); 218 } 219 /* NOTREACHED */ 220 } 221 222 struct fstab * 223 getfsent(void) 224 { 225 226 if ((!_fs_fp && !setfsent()) || !fstabscan()) 227 return (NULL); 228 return (&_fs_fstab); 229 } 230 231 struct fstab * 232 getfsspec(const char *name) 233 { 234 235 if (setfsent()) 236 while (fstabscan()) 237 if (!strcmp(_fs_fstab.fs_spec, name)) 238 return (&_fs_fstab); 239 return (NULL); 240 } 241 242 struct fstab * 243 getfsfile(const char *name) 244 { 245 246 if (setfsent()) 247 while (fstabscan()) 248 if (!strcmp(_fs_fstab.fs_file, name)) 249 return (&_fs_fstab); 250 return (NULL); 251 } 252 253 int 254 setfsent(void) 255 { 256 int fd; 257 258 if (_fs_fp) { 259 rewind(_fs_fp); 260 LineNo = 0; 261 return (1); 262 } 263 if (fsp_set == 0) { 264 if (issetugid()) 265 setfstab(NULL); 266 else 267 setfstab(getenv("PATH_FSTAB")); 268 } 269 fd = _open(path_fstab, O_RDONLY | O_CLOEXEC); 270 if (fd == -1) { 271 error(errno); 272 return (0); 273 } 274 _fs_fp = fdopen(fd, "r"); 275 if (_fs_fp != NULL) { 276 LineNo = 0; 277 return (1); 278 } 279 error(errno); 280 _close(fd); 281 return (0); 282 } 283 284 void 285 endfsent(void) 286 { 287 288 if (_fs_fp) { 289 (void)fclose(_fs_fp); 290 _fs_fp = NULL; 291 } 292 293 fsp_set = 0; 294 } 295 296 static void 297 error(int err) 298 { 299 char *p; 300 char num[30]; 301 302 (void)_write(STDERR_FILENO, "fstab: ", 7); 303 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab)); 304 (void)_write(STDERR_FILENO, ":", 1); 305 sprintf(num, "%d: ", LineNo); 306 (void)_write(STDERR_FILENO, num, strlen(num)); 307 p = strerror(err); 308 (void)_write(STDERR_FILENO, p, strlen(p)); 309 (void)_write(STDERR_FILENO, "\n", 1); 310 } 311