sbin/mount_cd9660/mount_cd9660.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley
   6  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
   7  * Support code is derived from software contributed to Berkeley
   8  * by Atsushi Murai (amurai@spec.co.jp).
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#)mount_cd9660.c   8.7 (Berkeley) 5/1/95
  35  * $FreeBSD: src/sbin/mount_cd9660/mount_cd9660.c,v 1.15.2.3 2001/03/14 12:05:01 bp Exp $
  36  */
  37
  38 #include <sys/cdio.h>
  39 #include <sys/param.h>
  40 #include <sys/mount.h>
  41 #include <sys/iconv.h>
  42 #include <sys/linker.h>
  43 #include <sys/module.h>
  44 #include <vfs/isofs/cd9660/cd9660_mount.h>
  45
  46 #include <ctype.h>
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <grp.h>
  51 #include <mntopts.h>
  52 #include <pwd.h>
  53 #include <stdlib.h>
  54 #include <stdio.h>
  55 #include <string.h>
  56 #include <locale.h>
  57 #include <sysexits.h>
  58 #include <unistd.h>
  59
  60 struct mntopt mopts[] = {
  61         MOPT_STDOPTS,
  62         MOPT_UPDATE,
  63         { "extatt", 0, ISOFSMNT_EXTATT, 1 },
  64         { "gens", 0, ISOFSMNT_GENS, 1 },
  65         { "rrip", 1, ISOFSMNT_NORRIP, 1 },
  66         { "joliet", 1, ISOFSMNT_NOJOLIET, 1 },
  67         { "strictjoliet", 1, ISOFSMNT_BROKENJOLIET, 1 },
  68         MOPT_NULL
  69 };
  70
  71 static gid_t    a_gid(const char *);
  72 static uid_t    a_uid(const char *);
  73 static mode_t   a_mask(const char *);
  74 static int      set_charset(struct iso_args *args, const char *cs_local);
  75 static int      get_ssector(const char *dev);
  76 static void     usage(void);
  77
  78 int
  79 main(int argc, char **argv)
  80 {
  81         struct stat sb;
  82         struct iso_args args;
  83         int ch, mntflags, opts, set_mask, set_dirmask;
  84         char *dev, *dir, mntpath[MAXPATHLEN];
  85         struct vfsconf vfc;
  86         int error, verbose;
  87         const char *cs_local;
  88
  89         mntflags = opts = set_mask = set_dirmask = verbose = 0;
  90         memset(&args, 0, sizeof args);
  91         args.ssector = -1;
  92         while ((ch = getopt(argc, argv, "bC:egG:jm:M:o:rs:U:v")) != -1)
  93                 switch (ch) {
  94                 case 'b':
  95                         opts |= ISOFSMNT_BROKENJOLIET;
  96                         break;
  97                 case 'C':
  98                         cs_local = kiconv_quirkcs(optarg, KICONV_VENDOR_MICSFT);
  99                         if (set_charset(&args, cs_local) == -1)
 100                                 err(EX_OSERR, "cd9660_iconv");
 101                         opts |= ISOFSMNT_KICONV;
 102                         break;
 103                 case 'e':
 104                         opts |= ISOFSMNT_EXTATT;
 105                         break;
 106                 case 'g':
 107                         opts |= ISOFSMNT_GENS;
 108                         break;
 109                 case 'G':
 110                         opts |= ISOFSMNT_GID;
 111                         args.gid = a_gid(optarg);
 112                         break;
 113                 case 'j':
 114                         opts |= ISOFSMNT_NOJOLIET;
 115                         break;
 116                 case 'm':
 117                         args.fmask = a_mask(optarg);
 118                         set_mask = 1;
 119                         break;
 120                 case 'M':
 121                         args.dmask = a_mask(optarg);
 122                         set_dirmask = 1;
 123                         break;
 124                 case 'o':
 125                         getmntopts(optarg, mopts, &mntflags, &opts);
 126                         break;
 127                 case 'r':
 128                         opts |= ISOFSMNT_NORRIP;
 129                         break;
 130                 case 's':
 131                         args.ssector = atoi(optarg);
 132                         break;
 133                 case 'U':
 134                         opts |= ISOFSMNT_UID;
 135                         args.uid = a_uid(optarg);
 136                         break;
 137                 case 'v':
 138                         verbose++;
 139                         break;
 140                 case '?':
 141                 default:
 142                         usage();
 143                 }
 144         argc -= optind;
 145         argv += optind;
 146
 147         if (argc != 2)
 148                 usage();
 149
 150         if (set_mask && !set_dirmask) {
 151                 args.dmask = args.fmask;
 152                 set_dirmask = 1;
 153         } else if (set_dirmask && !set_mask) {
 154                 args.fmask = args.dmask;
 155                 set_mask = 1;
 156         }
 157
 158         dev = argv[0];
 159         dir = argv[1];
 160
 161         /*
 162          * Resolve the mountpoint with realpath(3) and remove unnecessary
 163          * slashes from the devicename if there are any.
 164          */
 165         checkpath(dir, mntpath);
 166         rmslashes(dev, dev);
 167
 168 #define DEFAULT_ROOTUID -2
 169         /*
 170          * ISO 9660 filesystems are not writeable.
 171          */
 172         mntflags |= MNT_RDONLY;
 173         args.export.ex_flags = MNT_EXRDONLY;
 174         args.fspec = dev;
 175         args.export.ex_root = DEFAULT_ROOTUID;
 176         args.flags = opts;
 177
 178         if (args.ssector == -1) {
 179                 /*
 180                  * The start of the session has not been specified on
 181                  * the command line.  If we can successfully read the
 182                  * TOC of a CD-ROM, use the last data track we find.
 183                  * Otherwise, just use 0, in order to mount the very
 184                  * first session.  This is compatible with the
 185                  * historic behaviour of mount_cd9660(8).  If the user
 186                  * has specified -s <ssector> above, we don't get here
 187                  * and leave the user's will.
 188                  */
 189                 if ((args.ssector = get_ssector(dev)) == -1) {
 190                         if (verbose)
 191                                 printf("could not determine starting sector, "
 192                                        "using very first session\n");
 193                         args.ssector = 0;
 194                 } else if (verbose)
 195                         printf("using starting sector %d\n", args.ssector);
 196         }
 197
 198         if (!set_mask) {
 199                 if (stat(mntpath, &sb) == -1)
 200                         err(EX_OSERR, "stat %s", mntpath);
 201                 args.fmask = args.dmask =
 202                         sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
 203         }
 204
 205         error = getvfsbyname("cd9660", &vfc);
 206         if (error && vfsisloadable("cd9660")) {
 207                 if (vfsload("cd9660"))
 208                         err(EX_OSERR, "vfsload(cd9660)");
 209                 endvfsent();    /* flush cache */
 210                 error = getvfsbyname("cd9660", &vfc);
 211         }
 212         if (error)
 213                 errx(1, "cd9660 filesystem is not available");
 214
 215         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 216                 err(1, "%s", args.fspec);
 217         exit(0);
 218 }
 219
 220 static int
 221 set_charset(struct iso_args *args, const char *cs_local)
 222 {
 223         if (modfind("cd9660_iconv") < 0) {
 224                 if (kldload("cd9660_iconv") < 0 ||
 225                     modfind("cd9660_iconv") < 0) {
 226                         warnx("cannot find or load \"cd9660_iconv\" "
 227                               "kernel module");
 228                         return (-1);
 229                 }
 230         }
 231
 232         snprintf(args->cs_disk, sizeof(args->cs_disk), "%s", ENCODING_UNICODE);
 233         snprintf(args->cs_local, sizeof(args->cs_local), "%s", cs_local);
 234         if (kiconv_add_xlat16_cspairs(args->cs_disk, args->cs_local) != 0)
 235                 return (-1);
 236
 237         return (0);
 238 }
 239
 240 static void
 241 usage(void)
 242 {
 243         fprintf(stderr,
 244             "usage: mount_cd9660 [-begjrv] [-C charset] [-G gid] [-m mask]\n"
 245             "                    [-M mask] [-o options] [-s startsector]\n"
 246             "                    [-U uid] special_node\n");
 247         exit(EX_USAGE);
 248 }
 249
 250 static int
 251 get_ssector(const char *dev)
 252 {
 253         struct ioc_toc_header h;
 254         struct ioc_read_toc_entry t;
 255         struct cd_toc_entry toc_buffer[100];
 256         int fd, ntocentries, i;
 257
 258         if ((fd = open(dev, O_RDONLY)) == -1)
 259                 return -1;
 260         if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
 261                 close(fd);
 262                 return -1;
 263         }
 264
 265         ntocentries = h.ending_track - h.starting_track + 1;
 266         if (ntocentries > 100) {
 267                 /* unreasonable, only 100 allowed */
 268                 close(fd);
 269                 return -1;
 270         }
 271         t.address_format = CD_LBA_FORMAT;
 272         t.starting_track = 0;
 273         t.data_len = ntocentries * sizeof(struct cd_toc_entry);
 274         t.data = toc_buffer;
 275
 276         if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
 277                 close(fd);
 278                 return -1;
 279         }
 280         close(fd);
 281
 282         for (i = ntocentries - 1; i >= 0; i--)
 283                 if ((toc_buffer[i].control & 4) != 0)
 284                         /* found a data track */
 285                         break;
 286         if (i < 0)
 287                 return -1;
 288
 289         return ntohl(toc_buffer[i].addr.lba);
 290 }
 291
 292 static gid_t
 293 a_gid(const char *s)
 294 {
 295         struct group *gr;
 296         const char *gname;
 297         gid_t gid;
 298
 299         if ((gr = getgrnam(s)) != NULL) {
 300                 gid = gr->gr_gid;
 301         } else {
 302                 for (gname = s; *s && isdigit(*s); ++s)
 303                         ;
 304                 if (!*s)
 305                         gid = atoi(gname);
 306                 else
 307                         errx(EX_NOUSER, "unknown group id: %s", gname);
 308         }
 309         return (gid);
 310 }
 311
 312 static uid_t
 313 a_uid(const char *s)
 314 {
 315         struct passwd *pw;
 316         const char *uname;
 317         uid_t uid;
 318
 319         if ((pw = getpwnam(s)) != NULL) {
 320                 uid = pw->pw_uid;
 321         } else {
 322                 for (uname = s; *s && isdigit(*s); ++s)
 323                         ;
 324                 if (!*s)
 325                         uid = atoi(uname);
 326                 else
 327                         errx(EX_NOUSER, "unknown user id: %s", uname);
 328         }
 329         return (uid);
 330 }
 331
 332 static mode_t
 333 a_mask(const char *s)
 334 {
 335         int done, rv;
 336         char *ep;
 337
 338         done = 0;
 339         rv = -1;
 340         if (*s >= '0' && *s <= '7') {
 341                 done = 1;
 342                 rv = strtol(optarg, &ep, 8);
 343         }
 344         if (!done || rv < 0 || *ep)
 345                 errx(EX_USAGE, "invalid file mode: %s", s);
 346         return (rv);
 347 }