sbin/mount_msdos/mount_msdos.c

   1 /*      $NetBSD: mount_msdos.c,v 1.18 1997/09/16 12:24:18 lukem Exp $   */
   2
   3 /*
   4  * Copyright (c) 1994 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Christopher G. Demetriou.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/sbin/mount_msdos/mount_msdos.c,v 1.19.2.1 2000/07/20 10:35:13 kris Exp $
  33  * $DragonFly: src/sbin/mount_msdos/mount_msdos.c,v 1.8 2008/11/02 21:52:46 swildner Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/mount.h>
  38 #include <sys/stat.h>
  39 #include <sys/iconv.h>
  40 #include <sys/linker.h>
  41 #include <sys/module.h>
  42 #include <vfs/msdosfs/msdosfsmount.h>
  43
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <grp.h>
  47 #include <locale.h>
  48 #include <pwd.h>
  49 #include <stdio.h>
  50 /* must be after stdio to declare fparseln */
  51 #include <libutil.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <sysexits.h>
  55 #include <unistd.h>
  56
  57 #include "mntopts.h"
  58
  59 /*
  60  * XXX - no way to specify "foo=<bar>"-type options; that's what we'd
  61  * want for "-u", "-g", "-m", "-L", and "-D".
  62  */
  63 static struct mntopt mopts[] = {
  64         MOPT_STDOPTS,
  65         MOPT_FORCE,
  66         MOPT_SYNC,
  67         MOPT_UPDATE,
  68 #ifdef MSDOSFSMNT_GEMDOSFS
  69         { "gemdosfs", 0, MSDOSFSMNT_GEMDOSFS, 1 },
  70 #endif
  71         { "shortnames", 0, MSDOSFSMNT_SHORTNAME, 1 },
  72         { "longnames", 0, MSDOSFSMNT_LONGNAME, 1 },
  73         { "nowin95", 0, MSDOSFSMNT_NOWIN95, 1 },
  74         MOPT_NULL
  75 };
  76
  77 static gid_t    a_gid(char *);
  78 static uid_t    a_uid(char *);
  79 static mode_t   a_mask(char *);
  80 static void     usage(void) __dead2;
  81 int set_charset(struct msdosfs_args*, const char*, const char*);
  82
  83 int
  84 main(int argc, char **argv)
  85 {
  86         struct msdosfs_args args;
  87         struct stat sb;
  88         int c, error, mntflags, set_gid, set_uid, set_mask;
  89         char *dev, *dir, mntpath[MAXPATHLEN], *csp;
  90         const char *quirk = NULL;
  91         char *cs_local = NULL;
  92         char *cs_dos = NULL;
  93         struct vfsconf vfc;
  94         mntflags = set_gid = set_uid = set_mask = 0;
  95         memset(&args, '\0', sizeof(args));
  96         args.magic = MSDOSFS_ARGSMAGIC;
  97
  98         while ((c = getopt(argc, argv, "sl9u:g:m:o:L:D:")) != -1) {
  99                 switch (c) {
 100 #ifdef MSDOSFSMNT_GEMDOSFS
 101                 case 'G':
 102                         args.flags |= MSDOSFSMNT_GEMDOSFS;
 103                         break;
 104 #endif
 105                 case 's':
 106                         args.flags |= MSDOSFSMNT_SHORTNAME;
 107                         break;
 108                 case 'l':
 109                         args.flags |= MSDOSFSMNT_LONGNAME;
 110                         break;
 111                 case '9':
 112                         args.flags |= MSDOSFSMNT_NOWIN95;
 113                         break;
 114                 case 'u':
 115                         args.uid = a_uid(optarg);
 116                         set_uid = 1;
 117                         break;
 118                 case 'g':
 119                         args.gid = a_gid(optarg);
 120                         set_gid = 1;
 121                         break;
 122                 case 'm':
 123                         args.mask = a_mask(optarg);
 124                         set_mask = 1;
 125                         break;
 126                 case 'L':
 127                         if (setlocale(LC_CTYPE, optarg) == NULL)
 128                                 err(EX_CONFIG, "%s", optarg);
 129                         csp = strchr(optarg,'.');
 130                         if (!csp)
 131                                 err(EX_CONFIG, "%s", optarg);
 132                         quirk = kiconv_quirkcs(csp + 1, KICONV_VENDOR_MICSFT);
 133                         cs_local = strdup(quirk);
 134                         args.flags |= MSDOSFSMNT_KICONV;
 135                         break;
 136                 case 'D':
 137                         csp = optarg;
 138                         cs_dos = strdup(optarg);
 139                         args.flags |= MSDOSFSMNT_KICONV;
 140                         break;
 141                 case 'o':
 142                         getmntopts(optarg, mopts, &mntflags, &args.flags);
 143                         break;
 144                 case '?':
 145                 default:
 146                         usage();
 147                         break;
 148                 }
 149         }
 150
 151         if (optind + 2 != argc)
 152                 usage();
 153
 154         dev = argv[optind];
 155         dir = argv[optind + 1];
 156
 157         /*
 158          * Resolve the mountpoint with realpath(3) and remove unnecessary
 159          * slashes from the devicename if there are any.
 160          */
 161         checkpath(dir, mntpath);
 162         rmslashes(dev, dev);
 163
 164         args.fspec = dev;
 165         args.export.ex_root = -2;       /* unchecked anyway on DOS fs */
 166
 167         if (cs_local != NULL) {
 168                 if (set_charset(&args, cs_local, cs_dos) == -1)
 169                         err(EX_OSERR, "msdos_iconv");
 170         } else if (cs_dos != NULL) {
 171                 if (set_charset(&args, "ISO8859-1", cs_dos) == -1)
 172                         err(EX_OSERR, "msdos_iconv");
 173         }
 174
 175         if (mntflags & MNT_RDONLY)
 176                 args.export.ex_flags = MNT_EXRDONLY;
 177         else
 178                 args.export.ex_flags = 0;
 179         if (!set_gid || !set_uid || !set_mask) {
 180                 if (stat(mntpath, &sb) == -1)
 181                         err(EX_OSERR, "stat %s", mntpath);
 182
 183                 if (!set_uid)
 184                         args.uid = sb.st_uid;
 185                 if (!set_gid)
 186                         args.gid = sb.st_gid;
 187                 if (!set_mask)
 188                         args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
 189         }
 190
 191         error = getvfsbyname("msdos", &vfc);
 192         if (error && vfsisloadable("msdos")) {
 193                 if (vfsload("msdos"))
 194                         err(EX_OSERR, "vfsload(msdos)");
 195                 endvfsent();    /* clear cache */
 196                 error = getvfsbyname("msdos", &vfc);
 197         }
 198         if (error)
 199                 errx(EX_OSERR, "msdos filesystem is not available");
 200
 201         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 202                 err(EX_OSERR, "%s", dev);
 203
 204         exit (0);
 205 }
 206
 207 static gid_t
 208 a_gid(char *s)
 209 {
 210         struct group *gr;
 211         char *gname;
 212         gid_t gid;
 213
 214         if ((gr = getgrnam(s)) != NULL)
 215                 gid = gr->gr_gid;
 216         else {
 217                 for (gname = s; *s && isdigit(*s); ++s);
 218                 if (!*s)
 219                         gid = atoi(gname);
 220                 else
 221                         errx(EX_NOUSER, "unknown group id: %s", gname);
 222         }
 223         return (gid);
 224 }
 225
 226 static uid_t
 227 a_uid(char *s)
 228 {
 229         struct passwd *pw;
 230         char *uname;
 231         uid_t uid;
 232
 233         if ((pw = getpwnam(s)) != NULL)
 234                 uid = pw->pw_uid;
 235         else {
 236                 for (uname = s; *s && isdigit(*s); ++s);
 237                 if (!*s)
 238                         uid = atoi(uname);
 239                 else
 240                         errx(EX_NOUSER, "unknown user id: %s", uname);
 241         }
 242         return (uid);
 243 }
 244
 245 static mode_t
 246 a_mask(char *s)
 247 {
 248         int done, rv;
 249         char *ep;
 250
 251         done = 0;
 252         rv = -1;
 253         if (*s >= '0' && *s <= '7') {
 254                 done = 1;
 255                 rv = strtol(optarg, &ep, 8);
 256         }
 257         if (!done || rv < 0 || *ep)
 258                 errx(EX_USAGE, "invalid file mode: %s", s);
 259         return (rv);
 260 }
 261
 262 static void
 263 usage(void)
 264 {
 265         fprintf(stderr, "%s\n%s\n",
 266         "usage: mount_msdos [-o options] [-u user] [-g group] [-m mask]",
 267         "                   [-s] [-l] [-9] [-L locale] [-D codepage] bdev dir");
 268         exit(EX_USAGE);
 269 }
 270
 271 int
 272 set_charset(struct msdosfs_args *args, const char *cs_local, const char *cs_dos)
 273 {
 274         int error;
 275         if (modfind("msdos_iconv") < 0) {
 276                 if (kldload("msdos_iconv") < 0 || modfind("msdos_iconv") < 0)
 277                 {
 278                         warnx("cannot find or load \"msdos_iconv\" kernel module");
 279                         return (-1);
 280                 }
 281         }
 282         snprintf(args->cs_local, ICONV_CSNMAXLEN, "%s", cs_local);
 283         error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
 284         if (error)
 285                 return (-1);
 286         if (!cs_dos)
 287                 cs_dos = strdup("CP437");
 288         snprintf(args->cs_dos, ICONV_CSNMAXLEN, "%s", cs_dos);
 289         error = kiconv_add_xlat16_cspairs(cs_dos, cs_local);
 290         if (error)
 291                 return (-1);
 292         return (0);
 293 }