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  * SPDX-License-Identifier: BSD-4-Clause
   5  *
   6  * Copyright (c) 1994 Christopher G. Demetriou
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Christopher G. Demetriou.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/mount.h>
  37 #include <sys/stat.h>
  38 #include <sys/iconv.h>
  39 #include <sys/linker.h>
  40 #include <sys/module.h>
  41 #include <vfs/msdosfs/msdosfsmount.h>
  42
  43 #include <ctype.h>
  44 #include <err.h>
  45 #include <grp.h>
  46 #include <libutil.h>
  47 #include <locale.h>
  48 #include <mntopts.h>
  49 #include <pwd.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <sysexits.h>
  54 #include <unistd.h>
  55
  56 /*
  57  * XXX - no way to specify "foo=<bar>"-type options; that's what we'd
  58  * want for "-u", "-g", "-m", "-M", "-L", and "-D".
  59  */
  60 static struct mntopt mopts[] = {
  61         MOPT_STDOPTS,
  62         MOPT_FORCE,
  63         MOPT_SYNC,
  64         MOPT_ASYNC,
  65         MOPT_UPDATE,
  66         { "shortnames", 0, MSDOSFSMNT_SHORTNAME, 1 },
  67         { "longnames", 0, MSDOSFSMNT_LONGNAME, 1 },
  68         { "nowin95", 0, MSDOSFSMNT_NOWIN95, 1 },
  69         MOPT_NULL
  70 };
  71
  72 static gid_t a_gid(char *);
  73 static uid_t a_uid(char *);
  74 static mode_t a_mask(char *);
  75 static void usage(void) __dead2;
  76 int set_charset(struct msdosfs_args *, const char *, const char *);
  77
  78 int
  79 main(int argc, char **argv)
  80 {
  81         struct msdosfs_args args;
  82         struct stat sb;
  83         int c, error, mntflags, set_gid, set_uid, set_mask, set_dirmask;
  84         char *dev, *dir, mntpath[MAXPATHLEN], *csp;
  85         const char *quirk = NULL;
  86         char *cs_local = NULL;
  87         char *cs_dos = NULL;
  88         struct vfsconf vfc;
  89         mntflags = set_gid = set_uid = set_mask = set_dirmask = 0;
  90         memset(&args, '\0', sizeof(args));
  91
  92         while ((c = getopt(argc, argv, "sl9u:g:m:M:o:L:D:")) != -1) {
  93                 switch (c) {
  94                 case 's':
  95                         args.flags |= MSDOSFSMNT_SHORTNAME;
  96                         break;
  97                 case 'l':
  98                         args.flags |= MSDOSFSMNT_LONGNAME;
  99                         break;
 100                 case '9':
 101                         args.flags |= MSDOSFSMNT_NOWIN95;
 102                         break;
 103                 case 'u':
 104                         args.uid = a_uid(optarg);
 105                         set_uid = 1;
 106                         break;
 107                 case 'g':
 108                         args.gid = a_gid(optarg);
 109                         set_gid = 1;
 110                         break;
 111                 case 'm':
 112                         args.mask = a_mask(optarg);
 113                         set_mask = 1;
 114                         break;
 115                 case 'M':
 116                         args.dirmask = a_mask(optarg);
 117                         set_dirmask = 1;
 118                         break;
 119                 case 'L':
 120                         if (setlocale(LC_CTYPE, optarg) == NULL)
 121                                 err(EX_CONFIG, "%s", optarg);
 122                         csp = strchr(optarg,'.');
 123                         if (!csp)
 124                                 err(EX_CONFIG, "%s", optarg);
 125                         quirk = kiconv_quirkcs(csp + 1, KICONV_VENDOR_MICSFT);
 126                         cs_local = strdup(quirk);
 127                         args.flags |= MSDOSFSMNT_KICONV;
 128                         break;
 129                 case 'D':
 130                         csp = optarg;
 131                         cs_dos = strdup(optarg);
 132                         args.flags |= MSDOSFSMNT_KICONV;
 133                         break;
 134                 case 'o':
 135                         getmntopts(optarg, mopts, &mntflags, &args.flags);
 136                         break;
 137                 case '?':
 138                 default:
 139                         usage();
 140                         break;
 141                 }
 142         }
 143
 144         if (optind + 2 != argc)
 145                 usage();
 146
 147         if (set_mask && !set_dirmask) {
 148                 args.dirmask = args.mask;
 149                 set_dirmask = 1;
 150         }
 151         else if (set_dirmask && !set_mask) {
 152                 args.mask = args.dirmask;
 153                 set_mask = 1;
 154         }
 155
 156         dev = argv[optind];
 157         dir = argv[optind + 1];
 158
 159         /*
 160          * Resolve the mountpoint with realpath(3) and remove unnecessary
 161          * slashes from the devicename if there are any.
 162          */
 163         checkpath(dir, mntpath);
 164         rmslashes(dev, dev);
 165
 166         /*
 167          * If the device path is not absolute then automatically
 168          * add the /dev prefix.
 169          */
 170         if (dev[0] != '/')
 171                 asprintf(&args.fspec, "/dev/%s", dev);
 172         else
 173                 args.fspec = dev;
 174         args.export.ex_root = -2;       /* unchecked anyway on DOS fs */
 175
 176         if (cs_local != NULL) {
 177                 if (set_charset(&args, cs_local, cs_dos) == -1)
 178                         err(EX_OSERR, "msdos_iconv");
 179         } else if (cs_dos != NULL) {
 180                 if (set_charset(&args, "ISO8859-1", cs_dos) == -1)
 181                         err(EX_OSERR, "msdos_iconv");
 182         }
 183
 184         if (mntflags & MNT_RDONLY)
 185                 args.export.ex_flags = MNT_EXRDONLY;
 186         else
 187                 args.export.ex_flags = 0;
 188         if (!set_gid || !set_uid || !set_mask) {
 189                 if (stat(mntpath, &sb) == -1)
 190                         err(EX_OSERR, "stat %s", mntpath);
 191
 192                 if (!set_uid)
 193                         args.uid = sb.st_uid;
 194                 if (!set_gid)
 195                         args.gid = sb.st_gid;
 196                 if (!set_mask)
 197                         args.mask = args.dirmask =
 198                                 sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
 199         }
 200
 201         error = getvfsbyname("msdos", &vfc);
 202         if (error && vfsisloadable("msdos")) {
 203                 if (vfsload("msdos"))
 204                         err(EX_OSERR, "vfsload(msdos)");
 205                 endvfsent();    /* clear cache */
 206                 error = getvfsbyname("msdos", &vfc);
 207         }
 208         if (error)
 209                 errx(EX_OSERR, "msdos filesystem is not available");
 210
 211         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 212                 err(EX_OSERR, "%s", dev);
 213
 214         exit (0);
 215 }
 216
 217 static gid_t
 218 a_gid(char *s)
 219 {
 220         struct group *gr;
 221         char *gname;
 222         gid_t gid;
 223
 224         if ((gr = getgrnam(s)) != NULL)
 225                 gid = gr->gr_gid;
 226         else {
 227                 for (gname = s; *s && isdigit(*s); ++s);
 228                 if (!*s)
 229                         gid = atoi(gname);
 230                 else
 231                         errx(EX_NOUSER, "unknown group id: %s", gname);
 232         }
 233         return (gid);
 234 }
 235
 236 static uid_t
 237 a_uid(char *s)
 238 {
 239         struct passwd *pw;
 240         char *uname;
 241         uid_t uid;
 242
 243         if ((pw = getpwnam(s)) != NULL)
 244                 uid = pw->pw_uid;
 245         else {
 246                 for (uname = s; *s && isdigit(*s); ++s);
 247                 if (!*s)
 248                         uid = atoi(uname);
 249                 else
 250                         errx(EX_NOUSER, "unknown user id: %s", uname);
 251         }
 252         return (uid);
 253 }
 254
 255 static mode_t
 256 a_mask(char *s)
 257 {
 258         int done, rv;
 259         char *ep;
 260
 261         done = 0;
 262         rv = -1;
 263         if (*s >= '0' && *s <= '7') {
 264                 done = 1;
 265                 rv = strtol(optarg, &ep, 8);
 266         }
 267         if (!done || rv < 0 || *ep)
 268                 errx(EX_USAGE, "invalid file mode: %s", s);
 269         return (rv);
 270 }
 271
 272 static void
 273 usage(void)
 274 {
 275         fprintf(stderr, "%s\n%s\n%s\n",
 276             "usage: mount_msdos [-9ls] [-D DOS_codepage] [-g gid] [-L locale]",
 277             "                   [-M mask] [-m mask] [-o options] [-u uid]",
 278             "                   special node");
 279         exit(EX_USAGE);
 280 }
 281
 282 int
 283 set_charset(struct msdosfs_args *args, const char *cs_local, const char *cs_dos)
 284 {
 285         int error;
 286         if (modfind("msdos_iconv") < 0) {
 287                 if (kldload("msdos_iconv") < 0 || modfind("msdos_iconv") < 0) {
 288                         warnx("cannot find or load \"msdos_iconv\" kernel module");
 289                         return (-1);
 290                 }
 291         }
 292         snprintf(args->cs_local, ICONV_CSNMAXLEN, "%s", cs_local);
 293         error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
 294         if (error)
 295                 return (-1);
 296         if (!cs_dos)
 297                 cs_dos = strdup("CP437");
 298         snprintf(args->cs_dos, ICONV_CSNMAXLEN, "%s", cs_dos);
 299         error = kiconv_add_xlat16_cspairs(cs_dos, cs_local);
 300         if (error)
 301                 return (-1);
 302         return (0);
 303 }