| 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 | * $FreeBSD: src/lib/libc/gen/fstab.c,v 1.8 2000/01/27 23:06:15 jasone Exp $ |
| 34 | * $DragonFly: src/lib/libc/gen/fstab.c,v 1.6 2005/11/13 00:07:42 swildner Exp $ |
| 35 | * |
| 36 | * @(#)fstab.c 8.1 (Berkeley) 6/4/93 |
| 37 | * $FreeBSD: src/lib/libc/gen/fstab.c,v 1.8 2000/01/27 23:06:15 jasone Exp $ |
| 38 | */ |
| 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 | |
| 58 | static void error (int); |
| 59 | static void fixfsfile (void); |
| 60 | static int fstabscan (void); |
| 61 | |
| 62 | static void |
| 63 | fixfsfile(void) |
| 64 | { |
| 65 | static char buf[sizeof(_PATH_DEV) + MNAMELEN]; |
| 66 | struct stat sb; |
| 67 | struct statfs sf; |
| 68 | |
| 69 | if (strcmp(_fs_fstab.fs_file, "/") != 0) |
| 70 | return; |
| 71 | if (statfs("/", &sf) != 0) |
| 72 | return; |
| 73 | if (sf.f_mntfromname[0] == '/') |
| 74 | buf[0] = '\0'; |
| 75 | else |
| 76 | strcpy(buf, _PATH_DEV); |
| 77 | strcat(buf, sf.f_mntfromname); |
| 78 | if (stat(buf, &sb) != 0 || |
| 79 | (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) |
| 80 | return; |
| 81 | _fs_fstab.fs_spec = buf; |
| 82 | } |
| 83 | |
| 84 | static int |
| 85 | fstabscan(void) |
| 86 | { |
| 87 | char *cp, *p; |
| 88 | #define MAXLINELENGTH 1024 |
| 89 | static char line[MAXLINELENGTH]; |
| 90 | char subline[MAXLINELENGTH]; |
| 91 | int typexx; |
| 92 | |
| 93 | for (;;) { |
| 94 | |
| 95 | if (!(p = fgets(line, sizeof(line), _fs_fp))) |
| 96 | return(0); |
| 97 | /* OLD_STYLE_FSTAB */ |
| 98 | ++LineNo; |
| 99 | if (*line == '#' || *line == '\n') |
| 100 | continue; |
| 101 | if (!strpbrk(p, " \t")) { |
| 102 | _fs_fstab.fs_spec = strsep(&p, ":\n"); |
| 103 | _fs_fstab.fs_file = strsep(&p, ":\n"); |
| 104 | fixfsfile(); |
| 105 | _fs_fstab.fs_type = strsep(&p, ":\n"); |
| 106 | if (_fs_fstab.fs_type) { |
| 107 | if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) |
| 108 | continue; |
| 109 | _fs_fstab.fs_mntops = _fs_fstab.fs_type; |
| 110 | _fs_fstab.fs_vfstype = |
| 111 | strcmp(_fs_fstab.fs_type, FSTAB_SW) ? |
| 112 | "ufs" : "swap"; |
| 113 | if ((cp = strsep(&p, ":\n")) != NULL) { |
| 114 | _fs_fstab.fs_freq = atoi(cp); |
| 115 | if ((cp = strsep(&p, ":\n")) != NULL) { |
| 116 | _fs_fstab.fs_passno = atoi(cp); |
| 117 | return(1); |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | goto bad; |
| 122 | } |
| 123 | /* OLD_STYLE_FSTAB */ |
| 124 | while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') |
| 125 | ; |
| 126 | _fs_fstab.fs_spec = cp; |
| 127 | if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') |
| 128 | continue; |
| 129 | while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') |
| 130 | ; |
| 131 | _fs_fstab.fs_file = cp; |
| 132 | fixfsfile(); |
| 133 | while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') |
| 134 | ; |
| 135 | _fs_fstab.fs_vfstype = cp; |
| 136 | while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') |
| 137 | ; |
| 138 | _fs_fstab.fs_mntops = cp; |
| 139 | if (_fs_fstab.fs_mntops == NULL) |
| 140 | goto bad; |
| 141 | _fs_fstab.fs_freq = 0; |
| 142 | _fs_fstab.fs_passno = 0; |
| 143 | while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') |
| 144 | ; |
| 145 | if (cp != NULL) { |
| 146 | _fs_fstab.fs_freq = atoi(cp); |
| 147 | while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') |
| 148 | ; |
| 149 | if (cp != NULL) |
| 150 | _fs_fstab.fs_passno = atoi(cp); |
| 151 | } |
| 152 | strcpy(subline, _fs_fstab.fs_mntops); |
| 153 | p = subline; |
| 154 | for (typexx = 0, cp = strsep(&p, ","); cp; |
| 155 | cp = strsep(&p, ",")) { |
| 156 | if (strlen(cp) != 2) |
| 157 | continue; |
| 158 | if (!strcmp(cp, FSTAB_RW)) { |
| 159 | _fs_fstab.fs_type = FSTAB_RW; |
| 160 | break; |
| 161 | } |
| 162 | if (!strcmp(cp, FSTAB_RQ)) { |
| 163 | _fs_fstab.fs_type = FSTAB_RQ; |
| 164 | break; |
| 165 | } |
| 166 | if (!strcmp(cp, FSTAB_RO)) { |
| 167 | _fs_fstab.fs_type = FSTAB_RO; |
| 168 | break; |
| 169 | } |
| 170 | if (!strcmp(cp, FSTAB_SW)) { |
| 171 | _fs_fstab.fs_type = FSTAB_SW; |
| 172 | break; |
| 173 | } |
| 174 | if (!strcmp(cp, FSTAB_XX)) { |
| 175 | _fs_fstab.fs_type = FSTAB_XX; |
| 176 | typexx++; |
| 177 | break; |
| 178 | } |
| 179 | } |
| 180 | if (typexx) |
| 181 | continue; |
| 182 | if (cp != NULL) |
| 183 | return(1); |
| 184 | |
| 185 | bad: /* no way to distinguish between EOF and syntax error */ |
| 186 | error(EFTYPE); |
| 187 | } |
| 188 | /* NOTREACHED */ |
| 189 | } |
| 190 | |
| 191 | struct fstab * |
| 192 | getfsent(void) |
| 193 | { |
| 194 | if ((!_fs_fp && !setfsent()) || !fstabscan()) |
| 195 | return((struct fstab *)NULL); |
| 196 | return(&_fs_fstab); |
| 197 | } |
| 198 | |
| 199 | struct fstab * |
| 200 | getfsspec(const char *name) |
| 201 | { |
| 202 | if (setfsent()) |
| 203 | while (fstabscan()) |
| 204 | if (!strcmp(_fs_fstab.fs_spec, name)) |
| 205 | return(&_fs_fstab); |
| 206 | return((struct fstab *)NULL); |
| 207 | } |
| 208 | |
| 209 | struct fstab * |
| 210 | getfsfile(const char *name) |
| 211 | { |
| 212 | if (setfsent()) |
| 213 | while (fstabscan()) |
| 214 | if (!strcmp(_fs_fstab.fs_file, name)) |
| 215 | return(&_fs_fstab); |
| 216 | return((struct fstab *)NULL); |
| 217 | } |
| 218 | |
| 219 | int |
| 220 | setfsent(void) |
| 221 | { |
| 222 | if (_fs_fp) { |
| 223 | rewind(_fs_fp); |
| 224 | LineNo = 0; |
| 225 | return(1); |
| 226 | } |
| 227 | if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) { |
| 228 | LineNo = 0; |
| 229 | return(1); |
| 230 | } |
| 231 | error(errno); |
| 232 | return(0); |
| 233 | } |
| 234 | |
| 235 | void |
| 236 | endfsent(void) |
| 237 | { |
| 238 | if (_fs_fp) { |
| 239 | fclose(_fs_fp); |
| 240 | _fs_fp = NULL; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | static void |
| 245 | error(int err) |
| 246 | { |
| 247 | char *p; |
| 248 | char num[30]; |
| 249 | |
| 250 | _write(STDERR_FILENO, "fstab: ", 7); |
| 251 | _write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1); |
| 252 | _write(STDERR_FILENO, ":", 1); |
| 253 | sprintf(num, "%d: ", LineNo); |
| 254 | _write(STDERR_FILENO, num, strlen(num)); |
| 255 | p = strerror(err); |
| 256 | _write(STDERR_FILENO, p, strlen(p)); |
| 257 | _write(STDERR_FILENO, "\n", 1); |
| 258 | } |