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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)mount_cd9660.c      8.7 (Berkeley) 5/1/95
  39  *
  40  * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California.  All rights reserved.
  41  * @(#)mount_cd9660.c   8.7 (Berkeley) 5/1/95
  42  * $FreeBSD: src/sbin/mount_cd9660/mount_cd9660.c,v 1.15.2.3 2001/03/14 12:05:01 bp Exp $
  43  * $DragonFly: src/sbin/mount_cd9660/mount_cd9660.c,v 1.5 2005/04/02 21:43:15 dillon Exp $
  44  */
  45
  46 #include <sys/cdio.h>
  47 #include <sys/file.h>
  48 #include <sys/param.h>
  49 #include <sys/mount.h>
  50 #include <sys/../vfs/isofs/cd9660/cd9660_mount.h>
  51
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <stdlib.h>
  55 #include <stdio.h>
  56 #include <string.h>
  57 #include <sysexits.h>
  58 #include <unistd.h>
  59
  60 #include "mntopts.h"
  61
  62 struct mntopt mopts[] = {
  63         MOPT_STDOPTS,
  64         MOPT_UPDATE,
  65         { "extatt", 0, ISOFSMNT_EXTATT, 1 },
  66         { "gens", 0, ISOFSMNT_GENS, 1 },
  67         { "rrip", 1, ISOFSMNT_NORRIP, 1 },
  68         { "joliet", 1, ISOFSMNT_NOJOLIET, 1 },
  69         { "strictjoliet", 1, ISOFSMNT_BROKENJOLIET, 1 },
  70         MOPT_NULL
  71 };
  72
  73 static int      get_ssector(const char *dev);
  74 static void     usage(void);
  75
  76 int
  77 main(int argc, char **argv)
  78 {
  79         struct iso_args args;
  80         int ch, mntflags, opts;
  81         char *dev, *dir, mntpath[MAXPATHLEN];
  82         struct vfsconf vfc;
  83         int error, verbose;
  84
  85         mntflags = opts = verbose = 0;
  86         memset(&args, 0, sizeof args);
  87         args.ssector = -1;
  88         while ((ch = getopt(argc, argv, "begjo:rs:v")) != -1)
  89                 switch (ch) {
  90                 case 'b':
  91                         opts |= ISOFSMNT_BROKENJOLIET;
  92                         break;
  93                 case 'e':
  94                         opts |= ISOFSMNT_EXTATT;
  95                         break;
  96                 case 'g':
  97                         opts |= ISOFSMNT_GENS;
  98                         break;
  99                 case 'j':
 100                         opts |= ISOFSMNT_NOJOLIET;
 101                         break;
 102                 case 'o':
 103                         getmntopts(optarg, mopts, &mntflags, &opts);
 104                         break;
 105                 case 'r':
 106                         opts |= ISOFSMNT_NORRIP;
 107                         break;
 108                 case 's':
 109                         args.ssector = atoi(optarg);
 110                         break;
 111                 case 'v':
 112                         verbose++;
 113                         break;
 114                 case '?':
 115                 default:
 116                         usage();
 117                 }
 118         argc -= optind;
 119         argv += optind;
 120
 121         if (argc != 2)
 122                 usage();
 123
 124         dev = argv[0];
 125         dir = argv[1];
 126
 127         /*
 128          * Resolve the mountpoint with realpath(3) and remove unnecessary
 129          * slashes from the devicename if there are any.
 130          */
 131         checkpath(dir, mntpath);
 132         rmslashes(dev, dev);
 133
 134 #define DEFAULT_ROOTUID -2
 135         /*
 136          * ISO 9660 filesystems are not writeable.
 137          */
 138         mntflags |= MNT_RDONLY;
 139         args.export.ex_flags = MNT_EXRDONLY;
 140         args.fspec = dev;
 141         args.export.ex_root = DEFAULT_ROOTUID;
 142         args.flags = opts;
 143
 144         if (args.ssector == -1) {
 145                 /*
 146                  * The start of the session has not been specified on
 147                  * the command line.  If we can successfully read the
 148                  * TOC of a CD-ROM, use the last data track we find.
 149                  * Otherwise, just use 0, in order to mount the very
 150                  * first session.  This is compatible with the
 151                  * historic behaviour of mount_cd9660(8).  If the user
 152                  * has specified -s <ssector> above, we don't get here
 153                  * and leave the user's will.
 154                  */
 155                 if ((args.ssector = get_ssector(dev)) == -1) {
 156                         if (verbose)
 157                                 printf("could not determine starting sector, "
 158                                        "using very first session\n");
 159                         args.ssector = 0;
 160                 } else if (verbose)
 161                         printf("using starting sector %d\n", args.ssector);
 162         }
 163
 164         error = getvfsbyname("cd9660", &vfc);
 165         if (error && vfsisloadable("cd9660")) {
 166                 if (vfsload("cd9660"))
 167                         err(EX_OSERR, "vfsload(cd9660)");
 168                 endvfsent();    /* flush cache */
 169                 error = getvfsbyname("cd9660", &vfc);
 170         }
 171         if (error)
 172                 errx(1, "cd9660 filesystem is not available");
 173
 174         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 175                 err(1, "%s", args.fspec);
 176         exit(0);
 177 }
 178
 179 static void
 180 usage(void)
 181 {
 182         fprintf(stderr,
 183             "usage: mount_cd9660 [-egrv] [-o options] [-s startsector] special node\n");
 184         exit(EX_USAGE);
 185 }
 186
 187 static int
 188 get_ssector(const char *dev)
 189 {
 190         struct ioc_toc_header h;
 191         struct ioc_read_toc_entry t;
 192         struct cd_toc_entry toc_buffer[100];
 193         int fd, ntocentries, i;
 194
 195         if ((fd = open(dev, O_RDONLY)) == -1)
 196                 return -1;
 197         if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
 198                 close(fd);
 199                 return -1;
 200         }
 201
 202         ntocentries = h.ending_track - h.starting_track + 1;
 203         if (ntocentries > 100) {
 204                 /* unreasonable, only 100 allowed */
 205                 close(fd);
 206                 return -1;
 207         }
 208         t.address_format = CD_LBA_FORMAT;
 209         t.starting_track = 0;
 210         t.data_len = ntocentries * sizeof(struct cd_toc_entry);
 211         t.data = toc_buffer;
 212
 213         if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
 214                 close(fd);
 215                 return -1;
 216         }
 217         close(fd);
 218
 219         for (i = ntocentries - 1; i >= 0; i--)
 220                 if ((toc_buffer[i].control & 4) != 0)
 221                         /* found a data track */
 222                         break;
 223         if (i < 0)
 224                 return -1;
 225
 226         return ntohl(toc_buffer[i].addr.lba);
 227 }