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  *
  36  * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California.  All rights reserved.
  37  * @(#)mount_cd9660.c   8.7 (Berkeley) 5/1/95
  38  * $FreeBSD: src/sbin/mount_cd9660/mount_cd9660.c,v 1.15.2.3 2001/03/14 12:05:01 bp Exp $
  39  */
  40
  41 #include <sys/cdio.h>
  42 #include <sys/file.h>
  43 #include <sys/param.h>
  44 #include <sys/mount.h>
  45 #include <sys/iconv.h>
  46 #include <sys/linker.h>
  47 #include <sys/module.h>
  48 #include <vfs/isofs/cd9660/cd9660_mount.h>
  49
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <mntopts.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 int      get_ssector(const char *dev);
  72 static void     usage(void);
  73 int set_charset(struct iso_args *args, const char *cs_local, const char *cs_disk);
  74
  75 int
  76 main(int argc, char **argv)
  77 {
  78         struct iso_args args;
  79         int ch, mntflags, opts;
  80         char *dev, *dir, mntpath[MAXPATHLEN];
  81         struct vfsconf vfc;
  82         int error, verbose;
  83         const char *quirk;
  84         char *cs_local = NULL;
  85
  86         mntflags = opts = verbose = 0;
  87         memset(&args, 0, sizeof args);
  88         args.ssector = -1;
  89         while ((ch = getopt(argc, argv, "begjo:rs:C:v")) != -1)
  90                 switch (ch) {
  91                 case 'b':
  92                         opts |= ISOFSMNT_BROKENJOLIET;
  93                         break;
  94                 case 'e':
  95                         opts |= ISOFSMNT_EXTATT;
  96                         break;
  97                 case 'g':
  98                         opts |= ISOFSMNT_GENS;
  99                         break;
 100                 case 'j':
 101                         opts |= ISOFSMNT_NOJOLIET;
 102                         break;
 103                 case 'C':
 104                         quirk = kiconv_quirkcs(optarg, KICONV_VENDOR_MICSFT);
 105                         cs_local = strdup(quirk);
 106                         if (set_charset(&args, cs_local, NULL) == -1)
 107                                 err(EX_OSERR, "cd9660_iconv");
 108                         opts |= ISOFSMNT_KICONV;
 109                         break;
 110                 case 'o':
 111                         getmntopts(optarg, mopts, &mntflags, &opts);
 112                         break;
 113                 case 'r':
 114                         opts |= ISOFSMNT_NORRIP;
 115                         break;
 116                 case 's':
 117                         args.ssector = atoi(optarg);
 118                         break;
 119                 case 'v':
 120                         verbose++;
 121                         break;
 122                 case '?':
 123                 default:
 124                         usage();
 125                 }
 126         argc -= optind;
 127         argv += optind;
 128
 129         if (argc != 2)
 130                 usage();
 131
 132         dev = argv[0];
 133         dir = argv[1];
 134
 135         /*
 136          * Resolve the mountpoint with realpath(3) and remove unnecessary
 137          * slashes from the devicename if there are any.
 138          */
 139         checkpath(dir, mntpath);
 140         rmslashes(dev, dev);
 141
 142 #define DEFAULT_ROOTUID -2
 143         /*
 144          * ISO 9660 filesystems are not writeable.
 145          */
 146         mntflags |= MNT_RDONLY;
 147         args.export.ex_flags = MNT_EXRDONLY;
 148         args.fspec = dev;
 149         args.export.ex_root = DEFAULT_ROOTUID;
 150         args.flags = opts;
 151
 152         if (args.ssector == -1) {
 153                 /*
 154                  * The start of the session has not been specified on
 155                  * the command line.  If we can successfully read the
 156                  * TOC of a CD-ROM, use the last data track we find.
 157                  * Otherwise, just use 0, in order to mount the very
 158                  * first session.  This is compatible with the
 159                  * historic behaviour of mount_cd9660(8).  If the user
 160                  * has specified -s <ssector> above, we don't get here
 161                  * and leave the user's will.
 162                  */
 163                 if ((args.ssector = get_ssector(dev)) == -1) {
 164                         if (verbose)
 165                                 printf("could not determine starting sector, "
 166                                        "using very first session\n");
 167                         args.ssector = 0;
 168                 } else if (verbose)
 169                         printf("using starting sector %d\n", args.ssector);
 170         }
 171
 172         error = getvfsbyname("cd9660", &vfc);
 173         if (error && vfsisloadable("cd9660")) {
 174                 if (vfsload("cd9660"))
 175                         err(EX_OSERR, "vfsload(cd9660)");
 176                 endvfsent();    /* flush cache */
 177                 error = getvfsbyname("cd9660", &vfc);
 178         }
 179         if (error)
 180                 errx(1, "cd9660 filesystem is not available");
 181
 182         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 183                 err(1, "%s", args.fspec);
 184         exit(0);
 185 }
 186
 187 int
 188 set_charset(struct iso_args *args, const char *cs_local, const char *cs_disk)
 189 {
 190         int error;
 191         if (modfind("cd9660_iconv") < 0) {
 192                 if (kldload("cd9660_iconv") < 0 || modfind("cd9660_iconv") < 0)
 193                 {
 194                         warnx("cannot find or load \"cd9660_iconv\" kernel module");
 195                         return (-1);
 196                 }
 197         }
 198         snprintf(args->cs_local, ICONV_CSNMAXLEN, "%s", cs_local);
 199         error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
 200         if (error)
 201                 return (-1);
 202         if (!cs_disk)
 203                 cs_disk = strdup(ENCODING_UNICODE);
 204         snprintf(args->cs_disk, ICONV_CSNMAXLEN, "%s", cs_disk);
 205         error = kiconv_add_xlat16_cspairs(cs_disk, cs_local);
 206         if (error)
 207                 return (-1);
 208         return (0);
 209 }
 210
 211
 212 static void
 213 usage(void)
 214 {
 215         fprintf(stderr,
 216             "usage: mount_cd9660 [-begjrv] [-C charset] [-o options] [-s startsector] special node\n");
 217         exit(EX_USAGE);
 218 }
 219
 220 static int
 221 get_ssector(const char *dev)
 222 {
 223         struct ioc_toc_header h;
 224         struct ioc_read_toc_entry t;
 225         struct cd_toc_entry toc_buffer[100];
 226         int fd, ntocentries, i;
 227
 228         if ((fd = open(dev, O_RDONLY)) == -1)
 229                 return -1;
 230         if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
 231                 close(fd);
 232                 return -1;
 233         }
 234
 235         ntocentries = h.ending_track - h.starting_track + 1;
 236         if (ntocentries > 100) {
 237                 /* unreasonable, only 100 allowed */
 238                 close(fd);
 239                 return -1;
 240         }
 241         t.address_format = CD_LBA_FORMAT;
 242         t.starting_track = 0;
 243         t.data_len = ntocentries * sizeof(struct cd_toc_entry);
 244         t.data = toc_buffer;
 245
 246         if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
 247                 close(fd);
 248                 return -1;
 249         }
 250         close(fd);
 251
 252         for (i = ntocentries - 1; i >= 0; i--)
 253                 if ((toc_buffer[i].control & 4) != 0)
 254                         /* found a data track */
 255                         break;
 256         if (i < 0)
 257                 return -1;
 258
 259         return ntohl(toc_buffer[i].addr.lba);
 260 }