lib/libc/gen/fstab.c

   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 1.5 2005/01/31 22:29:15 dillon 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()
  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()
  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()
 193 {
 194         if ((!_fs_fp && !setfsent()) || !fstabscan())
 195                 return((struct fstab *)NULL);
 196         return(&_fs_fstab);
 197 }
 198
 199 struct fstab *
 200 getfsspec(name)
 201         const char *name;
 202 {
 203         if (setfsent())
 204                 while (fstabscan())
 205                         if (!strcmp(_fs_fstab.fs_spec, name))
 206                                 return(&_fs_fstab);
 207         return((struct fstab *)NULL);
 208 }
 209
 210 struct fstab *
 211 getfsfile(name)
 212         const char *name;
 213 {
 214         if (setfsent())
 215                 while (fstabscan())
 216                         if (!strcmp(_fs_fstab.fs_file, name))
 217                                 return(&_fs_fstab);
 218         return((struct fstab *)NULL);
 219 }
 220
 221 int
 222 setfsent()
 223 {
 224         if (_fs_fp) {
 225                 rewind(_fs_fp);
 226                 LineNo = 0;
 227                 return(1);
 228         }
 229         if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) {
 230                 LineNo = 0;
 231                 return(1);
 232         }
 233         error(errno);
 234         return(0);
 235 }
 236
 237 void
 238 endfsent()
 239 {
 240         if (_fs_fp) {
 241                 (void)fclose(_fs_fp);
 242                 _fs_fp = NULL;
 243         }
 244 }
 245
 246 static void
 247 error(err)
 248         int err;
 249 {
 250         char *p;
 251         char num[30];
 252
 253         (void)_write(STDERR_FILENO, "fstab: ", 7);
 254         (void)_write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
 255         (void)_write(STDERR_FILENO, ":", 1);
 256         sprintf(num, "%d: ", LineNo);
 257         (void)_write(STDERR_FILENO, num, strlen(num));
 258         p = strerror(err);
 259         (void)_write(STDERR_FILENO, p, strlen(p));
 260         (void)_write(STDERR_FILENO, "\n", 1);
 261 }