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  */
  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 <locale.h>
  47 #include <mntopts.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 /*
  58  * XXX - no way to specify "foo=<bar>"-type options; that's what we'd
  59  * want for "-u", "-g", "-m", "-L", and "-D".
  60  */
  61 static struct mntopt mopts[] = {
  62         MOPT_STDOPTS,
  63         MOPT_FORCE,
  64         MOPT_SYNC,
  65         MOPT_UPDATE,
  66 #ifdef MSDOSFSMNT_GEMDOSFS
  67         { "gemdosfs", 0, MSDOSFSMNT_GEMDOSFS, 1 },
  68 #endif
  69         { "shortnames", 0, MSDOSFSMNT_SHORTNAME, 1 },
  70         { "longnames", 0, MSDOSFSMNT_LONGNAME, 1 },
  71         { "nowin95", 0, MSDOSFSMNT_NOWIN95, 1 },
  72         MOPT_NULL
  73 };
  74
  75 static gid_t    a_gid(char *);
  76 static uid_t    a_uid(char *);
  77 static mode_t   a_mask(char *);
  78 static void     usage(void) __dead2;
  79 int set_charset(struct msdosfs_args*, const char*, const char*);
  80
  81 int
  82 main(int argc, char **argv)
  83 {
  84         struct msdosfs_args args;
  85         struct stat sb;
  86         int c, error, mntflags, set_gid, set_uid, set_mask;
  87         char *dev, *dir, mntpath[MAXPATHLEN], *csp;
  88         const char *quirk = NULL;
  89         char *cs_local = NULL;
  90         char *cs_dos = NULL;
  91         struct vfsconf vfc;
  92         mntflags = set_gid = set_uid = set_mask = 0;
  93         memset(&args, '\0', sizeof(args));
  94         args.magic = MSDOSFS_ARGSMAGIC;
  95
  96         while ((c = getopt(argc, argv, "sl9u:g:m:o:L:D:")) != -1) {
  97                 switch (c) {
  98 #ifdef MSDOSFSMNT_GEMDOSFS
  99                 case 'G':
 100                         args.flags |= MSDOSFSMNT_GEMDOSFS;
 101                         break;
 102 #endif
 103                 case 's':
 104                         args.flags |= MSDOSFSMNT_SHORTNAME;
 105                         break;
 106                 case 'l':
 107                         args.flags |= MSDOSFSMNT_LONGNAME;
 108                         break;
 109                 case '9':
 110                         args.flags |= MSDOSFSMNT_NOWIN95;
 111                         break;
 112                 case 'u':
 113                         args.uid = a_uid(optarg);
 114                         set_uid = 1;
 115                         break;
 116                 case 'g':
 117                         args.gid = a_gid(optarg);
 118                         set_gid = 1;
 119                         break;
 120                 case 'm':
 121                         args.mask = a_mask(optarg);
 122                         set_mask = 1;
 123                         break;
 124                 case 'L':
 125                         if (setlocale(LC_CTYPE, optarg) == NULL)
 126                                 err(EX_CONFIG, "%s", optarg);
 127                         csp = strchr(optarg,'.');
 128                         if (!csp)
 129                                 err(EX_CONFIG, "%s", optarg);
 130                         quirk = kiconv_quirkcs(csp + 1, KICONV_VENDOR_MICSFT);
 131                         cs_local = strdup(quirk);
 132                         args.flags |= MSDOSFSMNT_KICONV;
 133                         break;
 134                 case 'D':
 135                         csp = optarg;
 136                         cs_dos = strdup(optarg);
 137                         args.flags |= MSDOSFSMNT_KICONV;
 138                         break;
 139                 case 'o':
 140                         getmntopts(optarg, mopts, &mntflags, &args.flags);
 141                         break;
 142                 case '?':
 143                 default:
 144                         usage();
 145                         break;
 146                 }
 147         }
 148
 149         if (optind + 2 != argc)
 150                 usage();
 151
 152         dev = argv[optind];
 153         dir = argv[optind + 1];
 154
 155         /*
 156          * Resolve the mountpoint with realpath(3) and remove unnecessary
 157          * slashes from the devicename if there are any.
 158          */
 159         checkpath(dir, mntpath);
 160         rmslashes(dev, dev);
 161
 162         args.fspec = dev;
 163         args.export.ex_root = -2;       /* unchecked anyway on DOS fs */
 164
 165         if (cs_local != NULL) {
 166                 if (set_charset(&args, cs_local, cs_dos) == -1)
 167                         err(EX_OSERR, "msdos_iconv");
 168         } else if (cs_dos != NULL) {
 169                 if (set_charset(&args, "ISO8859-1", cs_dos) == -1)
 170                         err(EX_OSERR, "msdos_iconv");
 171         }
 172
 173         if (mntflags & MNT_RDONLY)
 174                 args.export.ex_flags = MNT_EXRDONLY;
 175         else
 176                 args.export.ex_flags = 0;
 177         if (!set_gid || !set_uid || !set_mask) {
 178                 if (stat(mntpath, &sb) == -1)
 179                         err(EX_OSERR, "stat %s", mntpath);
 180
 181                 if (!set_uid)
 182                         args.uid = sb.st_uid;
 183                 if (!set_gid)
 184                         args.gid = sb.st_gid;
 185                 if (!set_mask)
 186                         args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
 187         }
 188
 189         error = getvfsbyname("msdos", &vfc);
 190         if (error && vfsisloadable("msdos")) {
 191                 if (vfsload("msdos"))
 192                         err(EX_OSERR, "vfsload(msdos)");
 193                 endvfsent();    /* clear cache */
 194                 error = getvfsbyname("msdos", &vfc);
 195         }
 196         if (error)
 197                 errx(EX_OSERR, "msdos filesystem is not available");
 198
 199         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 200                 err(EX_OSERR, "%s", dev);
 201
 202         exit (0);
 203 }
 204
 205 static gid_t
 206 a_gid(char *s)
 207 {
 208         struct group *gr;
 209         char *gname;
 210         gid_t gid;
 211
 212         if ((gr = getgrnam(s)) != NULL)
 213                 gid = gr->gr_gid;
 214         else {
 215                 for (gname = s; *s && isdigit(*s); ++s);
 216                 if (!*s)
 217                         gid = atoi(gname);
 218                 else
 219                         errx(EX_NOUSER, "unknown group id: %s", gname);
 220         }
 221         return (gid);
 222 }
 223
 224 static uid_t
 225 a_uid(char *s)
 226 {
 227         struct passwd *pw;
 228         char *uname;
 229         uid_t uid;
 230
 231         if ((pw = getpwnam(s)) != NULL)
 232                 uid = pw->pw_uid;
 233         else {
 234                 for (uname = s; *s && isdigit(*s); ++s);
 235                 if (!*s)
 236                         uid = atoi(uname);
 237                 else
 238                         errx(EX_NOUSER, "unknown user id: %s", uname);
 239         }
 240         return (uid);
 241 }
 242
 243 static mode_t
 244 a_mask(char *s)
 245 {
 246         int done, rv;
 247         char *ep;
 248
 249         done = 0;
 250         rv = -1;
 251         if (*s >= '0' && *s <= '7') {
 252                 done = 1;
 253                 rv = strtol(optarg, &ep, 8);
 254         }
 255         if (!done || rv < 0 || *ep)
 256                 errx(EX_USAGE, "invalid file mode: %s", s);
 257         return (rv);
 258 }
 259
 260 static void
 261 usage(void)
 262 {
 263         fprintf(stderr, "%s\n%s\n",
 264             "usage: mount_msdos [-9ls] [-D DOS_codepage] [-g gid] [-L locale]",
 265             "                   [-m mask] [-o options] [-u uid] special node");
 266         exit(EX_USAGE);
 267 }
 268
 269 int
 270 set_charset(struct msdosfs_args *args, const char *cs_local, const char *cs_dos)
 271 {
 272         int error;
 273         if (modfind("msdos_iconv") < 0) {
 274                 if (kldload("msdos_iconv") < 0 || modfind("msdos_iconv") < 0)
 275                 {
 276                         warnx("cannot find or load \"msdos_iconv\" kernel module");
 277                         return (-1);
 278                 }
 279         }
 280         snprintf(args->cs_local, ICONV_CSNMAXLEN, "%s", cs_local);
 281         error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
 282         if (error)
 283                 return (-1);
 284         if (!cs_dos)
 285                 cs_dos = strdup("CP437");
 286         snprintf(args->cs_dos, ICONV_CSNMAXLEN, "%s", cs_dos);
 287         error = kiconv_add_xlat16_cspairs(cs_dos, cs_local);
 288         if (error)
 289                 return (-1);
 290         return (0);
 291 }