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/iconv.h>
  51 #include <sys/linker.h>
  52 #include <sys/module.h>
  53 #include <vfs/isofs/cd9660/cd9660_mount.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <stdlib.h>
  58 #include <stdio.h>
  59 #include <string.h>
  60 #include <locale.h>
  61 #include <sysexits.h>
  62 #include <unistd.h>
  63
  64 #include "mntopts.h"
  65
  66 struct mntopt mopts[] = {
  67         MOPT_STDOPTS,
  68         MOPT_UPDATE,
  69         { "extatt", 0, ISOFSMNT_EXTATT, 1 },
  70         { "gens", 0, ISOFSMNT_GENS, 1 },
  71         { "rrip", 1, ISOFSMNT_NORRIP, 1 },
  72         { "joliet", 1, ISOFSMNT_NOJOLIET, 1 },
  73         { "strictjoliet", 1, ISOFSMNT_BROKENJOLIET, 1 },
  74         MOPT_NULL
  75 };
  76
  77 static int      get_ssector(const char *dev);
  78 static void     usage(void);
  79 int set_charset(struct iso_args *args, const char *cs_local, const char *cs_disk);
  80
  81 int
  82 main(int argc, char **argv)
  83 {
  84         struct iso_args args;
  85         int ch, mntflags, opts;
  86         char *dev, *dir, mntpath[MAXPATHLEN];
  87         struct vfsconf vfc;
  88         int error, verbose;
  89         const char *quirk;
  90         char *cs_local = NULL;
  91
  92         mntflags = opts = verbose = 0;
  93         memset(&args, 0, sizeof args);
  94         args.ssector = -1;
  95         while ((ch = getopt(argc, argv, "begjo:rs:C:v")) != -1)
  96                 switch (ch) {
  97                 case 'b':
  98                         opts |= ISOFSMNT_BROKENJOLIET;
  99                         break;
 100                 case 'e':
 101                         opts |= ISOFSMNT_EXTATT;
 102                         break;
 103                 case 'g':
 104                         opts |= ISOFSMNT_GENS;
 105                         break;
 106                 case 'j':
 107                         opts |= ISOFSMNT_NOJOLIET;
 108                         break;
 109                 case 'C':
 110                         quirk = kiconv_quirkcs(optarg, KICONV_VENDOR_MICSFT);
 111                         cs_local = strdup(quirk);
 112                         if (set_charset(&args, cs_local, NULL) == -1)
 113                                 err(EX_OSERR, "cd9660_iconv");
 114                         opts |= ISOFSMNT_KICONV;
 115                         break;
 116                 case 'o':
 117                         getmntopts(optarg, mopts, &mntflags, &opts);
 118                         break;
 119                 case 'r':
 120                         opts |= ISOFSMNT_NORRIP;
 121                         break;
 122                 case 's':
 123                         args.ssector = atoi(optarg);
 124                         break;
 125                 case 'v':
 126                         verbose++;
 127                         break;
 128                 case '?':
 129                 default:
 130                         usage();
 131                 }
 132         argc -= optind;
 133         argv += optind;
 134
 135         if (argc != 2)
 136                 usage();
 137
 138         dev = argv[0];
 139         dir = argv[1];
 140
 141         /*
 142          * Resolve the mountpoint with realpath(3) and remove unnecessary
 143          * slashes from the devicename if there are any.
 144          */
 145         checkpath(dir, mntpath);
 146         rmslashes(dev, dev);
 147
 148 #define DEFAULT_ROOTUID -2
 149         /*
 150          * ISO 9660 filesystems are not writeable.
 151          */
 152         mntflags |= MNT_RDONLY;
 153         args.export.ex_flags = MNT_EXRDONLY;
 154         args.fspec = dev;
 155         args.export.ex_root = DEFAULT_ROOTUID;
 156         args.flags = opts;
 157
 158         if (args.ssector == -1) {
 159                 /*
 160                  * The start of the session has not been specified on
 161                  * the command line.  If we can successfully read the
 162                  * TOC of a CD-ROM, use the last data track we find.
 163                  * Otherwise, just use 0, in order to mount the very
 164                  * first session.  This is compatible with the
 165                  * historic behaviour of mount_cd9660(8).  If the user
 166                  * has specified -s <ssector> above, we don't get here
 167                  * and leave the user's will.
 168                  */
 169                 if ((args.ssector = get_ssector(dev)) == -1) {
 170                         if (verbose)
 171                                 printf("could not determine starting sector, "
 172                                        "using very first session\n");
 173                         args.ssector = 0;
 174                 } else if (verbose)
 175                         printf("using starting sector %d\n", args.ssector);
 176         }
 177
 178         error = getvfsbyname("cd9660", &vfc);
 179         if (error && vfsisloadable("cd9660")) {
 180                 if (vfsload("cd9660"))
 181                         err(EX_OSERR, "vfsload(cd9660)");
 182                 endvfsent();    /* flush cache */
 183                 error = getvfsbyname("cd9660", &vfc);
 184         }
 185         if (error)
 186                 errx(1, "cd9660 filesystem is not available");
 187
 188         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 189                 err(1, "%s", args.fspec);
 190         exit(0);
 191 }
 192
 193 int
 194 set_charset(struct iso_args *args, const char *cs_local, const char *cs_disk)
 195 {
 196         int error;
 197         if (modfind("cd9660_iconv") < 0) {
 198                 if (kldload("cd9660_iconv") < 0 || modfind("cd9660_iconv") < 0)
 199                 {
 200                         warnx("cannot find or load \"cd9660_iconv\" kernel module");
 201                         return (-1);
 202                 }
 203         }
 204         snprintf(args->cs_local, ICONV_CSNMAXLEN, "%s", cs_local);
 205         error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
 206         if (error)
 207                 return (-1);
 208         if (!cs_disk)
 209                 cs_disk = strdup(ENCODING_UNICODE);
 210         snprintf(args->cs_disk, ICONV_CSNMAXLEN, "%s", cs_disk);
 211         error = kiconv_add_xlat16_cspairs(cs_disk, cs_local);
 212         if (error)
 213                 return (-1);
 214         return (0);
 215 }
 216
 217
 218 static void
 219 usage(void)
 220 {
 221         fprintf(stderr,
 222             "usage: mount_cd9660 [-egrv] [-C charset] [-o options] [-s startsector] special node\n");
 223         exit(EX_USAGE);
 224 }
 225
 226 static int
 227 get_ssector(const char *dev)
 228 {
 229         struct ioc_toc_header h;
 230         struct ioc_read_toc_entry t;
 231         struct cd_toc_entry toc_buffer[100];
 232         int fd, ntocentries, i;
 233
 234         if ((fd = open(dev, O_RDONLY)) == -1)
 235                 return -1;
 236         if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
 237                 close(fd);
 238                 return -1;
 239         }
 240
 241         ntocentries = h.ending_track - h.starting_track + 1;
 242         if (ntocentries > 100) {
 243                 /* unreasonable, only 100 allowed */
 244                 close(fd);
 245                 return -1;
 246         }
 247         t.address_format = CD_LBA_FORMAT;
 248         t.starting_track = 0;
 249         t.data_len = ntocentries * sizeof(struct cd_toc_entry);
 250         t.data = toc_buffer;
 251
 252         if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
 253                 close(fd);
 254                 return -1;
 255         }
 256         close(fd);
 257
 258         for (i = ntocentries - 1; i >= 0; i--)
 259                 if ((toc_buffer[i].control & 4) != 0)
 260                         /* found a data track */
 261                         break;
 262         if (i < 0)
 263                 return -1;
 264
 265         return ntohl(toc_buffer[i].addr.lba);
 266 }