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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "namespace.h" 41 #include <sys/param.h> 42 #include <sys/mount.h> 43 #include <sys/stat.h> 44 45 #include <errno.h> 46 #include <fstab.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include "un-namespace.h" 53 54 static FILE *_fs_fp; 55 static struct fstab _fs_fstab; 56 static int LineNo = 0; 57 static char *path_fstab; 58 static char fstab_path[PATH_MAX]; 59 static int fsp_set = 0; 60 61 static void error(int); 62 static void fixfsfile(void); 63 static int fstabscan(void); 64 65 void 66 setfstab(const char *file) 67 { 68 69 if (file == NULL) { 70 path_fstab = _PATH_FSTAB; 71 } else { 72 strncpy(fstab_path, file, PATH_MAX); 73 fstab_path[PATH_MAX - 1] = '\0'; 74 path_fstab = fstab_path; 75 } 76 fsp_set = 1; 77 78 return; 79 } 80 81 const char * 82 getfstab (void) 83 { 84 85 if (fsp_set) 86 return (path_fstab); 87 else 88 return (_PATH_FSTAB); 89 } 90 91 static void 92 fixfsfile() 93 { 94 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 95 struct stat sb; 96 struct statfs sf; 97 98 if (strcmp(_fs_fstab.fs_file, "/") != 0) 99 return; 100 if (statfs("/", &sf) != 0) 101 return; 102 if (sf.f_mntfromname[0] == '/') 103 buf[0] = '\0'; 104 else 105 strcpy(buf, _PATH_DEV); 106 strcat(buf, sf.f_mntfromname); 107 if (stat(buf, &sb) != 0 || 108 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 109 return; 110 _fs_fstab.fs_spec = buf; 111 } 112 113 static int 114 fstabscan() 115 { 116 char *cp, *p; 117 #define MAXLINELENGTH 1024 118 static char line[MAXLINELENGTH]; 119 char subline[MAXLINELENGTH]; 120 int typexx; 121 122 for (;;) { 123 124 if (!(p = fgets(line, sizeof(line), _fs_fp))) 125 return(0); 126 /* OLD_STYLE_FSTAB */ 127 ++LineNo; 128 if (*line == '#' || *line == '\n') 129 continue; 130 if (!strpbrk(p, " \t")) { 131 _fs_fstab.fs_spec = strsep(&p, ":\n"); 132 _fs_fstab.fs_file = strsep(&p, ":\n"); 133 fixfsfile(); 134 _fs_fstab.fs_type = strsep(&p, ":\n"); 135 if (_fs_fstab.fs_type) { 136 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 137 continue; 138 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 139 _fs_fstab.fs_vfstype = 140 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 141 "ufs" : "swap"; 142 if ((cp = strsep(&p, ":\n")) != NULL) { 143 _fs_fstab.fs_freq = atoi(cp); 144 if ((cp = strsep(&p, ":\n")) != NULL) { 145 _fs_fstab.fs_passno = atoi(cp); 146 return(1); 147 } 148 } 149 } 150 goto bad; 151 } 152 /* OLD_STYLE_FSTAB */ 153 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 154 ; 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 _fs_fstab.fs_file = cp; 161 fixfsfile(); 162 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 163 ; 164 _fs_fstab.fs_vfstype = cp; 165 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 166 ; 167 _fs_fstab.fs_mntops = cp; 168 if (_fs_fstab.fs_mntops == NULL) 169 goto bad; 170 _fs_fstab.fs_freq = 0; 171 _fs_fstab.fs_passno = 0; 172 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 173 ; 174 if (cp != NULL) { 175 _fs_fstab.fs_freq = atoi(cp); 176 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 177 ; 178 if (cp != NULL) 179 _fs_fstab.fs_passno = atoi(cp); 180 } 181 strcpy(subline, _fs_fstab.fs_mntops); 182 p = subline; 183 for (typexx = 0, cp = strsep(&p, ","); cp; 184 cp = strsep(&p, ",")) { 185 if (strlen(cp) != 2) 186 continue; 187 if (!strcmp(cp, FSTAB_RW)) { 188 _fs_fstab.fs_type = FSTAB_RW; 189 break; 190 } 191 if (!strcmp(cp, FSTAB_RQ)) { 192 _fs_fstab.fs_type = FSTAB_RQ; 193 break; 194 } 195 if (!strcmp(cp, FSTAB_RO)) { 196 _fs_fstab.fs_type = FSTAB_RO; 197 break; 198 } 199 if (!strcmp(cp, FSTAB_SW)) { 200 _fs_fstab.fs_type = FSTAB_SW; 201 break; 202 } 203 if (!strcmp(cp, FSTAB_XX)) { 204 _fs_fstab.fs_type = FSTAB_XX; 205 typexx++; 206 break; 207 } 208 } 209 if (typexx) 210 continue; 211 if (cp != NULL) 212 return(1); 213 214 bad: /* no way to distinguish between EOF and syntax error */ 215 error(EFTYPE); 216 } 217 /* NOTREACHED */ 218 } 219 220 struct fstab * 221 getfsent() 222 { 223 if ((!_fs_fp && !setfsent()) || !fstabscan()) 224 return((struct fstab *)NULL); 225 return(&_fs_fstab); 226 } 227 228 struct fstab * 229 getfsspec(name) 230 const char *name; 231 { 232 if (setfsent()) 233 while (fstabscan()) 234 if (!strcmp(_fs_fstab.fs_spec, name)) 235 return(&_fs_fstab); 236 return((struct fstab *)NULL); 237 } 238 239 struct fstab * 240 getfsfile(name) 241 const char *name; 242 { 243 if (setfsent()) 244 while (fstabscan()) 245 if (!strcmp(_fs_fstab.fs_file, name)) 246 return(&_fs_fstab); 247 return((struct fstab *)NULL); 248 } 249 250 int 251 setfsent() 252 { 253 if (_fs_fp) { 254 rewind(_fs_fp); 255 LineNo = 0; 256 return(1); 257 } 258 if (fsp_set == 0) { 259 if (issetugid()) 260 setfstab(NULL); 261 else 262 setfstab(getenv("PATH_FSTAB")); 263 } 264 if ((_fs_fp = fopen(path_fstab, "r")) != NULL) { 265 LineNo = 0; 266 return(1); 267 } 268 error(errno); 269 return(0); 270 } 271 272 void 273 endfsent() 274 { 275 if (_fs_fp) { 276 (void)fclose(_fs_fp); 277 _fs_fp = NULL; 278 } 279 280 fsp_set = 0; 281 } 282 283 static void 284 error(err) 285 int err; 286 { 287 char *p; 288 char num[30]; 289 290 (void)_write(STDERR_FILENO, "fstab: ", 7); 291 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab)); 292 (void)_write(STDERR_FILENO, ":", 1); 293 sprintf(num, "%d: ", LineNo); 294 (void)_write(STDERR_FILENO, num, strlen(num)); 295 p = strerror(err); 296 (void)_write(STDERR_FILENO, p, strlen(p)); 297 (void)_write(STDERR_FILENO, "\n", 1); 298 } 299