Unix/ventoy_unix_src/DragonFly/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/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/iconv.h>
  45 #include <sys/linker.h>
  46 #include <sys/module.h>
  47 #include <vfs/isofs/cd9660/cd9660_mount.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.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 static 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 mount_cd9660(char *dev, char *dir)
  77 {
  78         struct iso_args args;
  79         int ch, mntflags, opts;
  80         char 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 = 0;
  89
  90         /*
  91          * Resolve the mountpoint with realpath(3) and remove unnecessary
  92          * slashes from the devicename if there are any.
  93          */
  94         checkpath(dir, mntpath);
  95         rmslashes(dev, dev);
  96
  97 #define DEFAULT_ROOTUID -2
  98         /*
  99          * ISO 9660 filesystems are not writeable.
 100          */
 101         mntflags |= MNT_RDONLY;
 102         args.export.ex_flags = MNT_EXRDONLY;
 103         args.fspec = dev;
 104         args.export.ex_root = DEFAULT_ROOTUID;
 105         args.flags = opts;
 106
 107         if (args.ssector == -1) {
 108                 /*
 109                  * The start of the session has not been specified on
 110                  * the command line.  If we can successfully read the
 111                  * TOC of a CD-ROM, use the last data track we find.
 112                  * Otherwise, just use 0, in order to mount the very
 113                  * first session.  This is compatible with the
 114                  * historic behaviour of mount_cd9660(8).  If the user
 115                  * has specified -s <ssector> above, we don't get here
 116                  * and leave the user's will.
 117                  */
 118                 if ((args.ssector = get_ssector(dev)) == -1) {
 119                         if (verbose)
 120                                 printf("could not determine starting sector, "
 121                                        "using very first session\n");
 122                         args.ssector = 0;
 123                 } else if (verbose)
 124                         printf("using starting sector %d\n", args.ssector);
 125         }
 126
 127         error = getvfsbyname("cd9660", &vfc);
 128         if (error && vfsisloadable("cd9660")) {
 129                 if (vfsload("cd9660"))
 130                         err(EX_OSERR, "vfsload(cd9660)");
 131                 endvfsent();    /* flush cache */
 132                 error = getvfsbyname("cd9660", &vfc);
 133         }
 134         if (error)
 135                 errx(1, "cd9660 filesystem is not available");
 136
 137         if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
 138                 err(1, "%s", args.fspec);
 139
 140     return 0;
 141 }
 142
 143 int
 144 set_charset(struct iso_args *args, const char *cs_local, const char *cs_disk)
 145 {
 146         int error;
 147         if (modfind("cd9660_iconv") < 0) {
 148                 if (kldload("cd9660_iconv") < 0 || modfind("cd9660_iconv") < 0)
 149                 {
 150                         warnx("cannot find or load \"cd9660_iconv\" kernel module");
 151                         return (-1);
 152                 }
 153         }
 154         snprintf(args->cs_local, ICONV_CSNMAXLEN, "%s", cs_local);
 155         error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
 156         if (error)
 157                 return (-1);
 158         if (!cs_disk)
 159                 cs_disk = strdup(ENCODING_UNICODE);
 160         snprintf(args->cs_disk, ICONV_CSNMAXLEN, "%s", cs_disk);
 161         error = kiconv_add_xlat16_cspairs(cs_disk, cs_local);
 162         if (error)
 163                 return (-1);
 164         return (0);
 165 }
 166
 167
 168 static void
 169 usage(void)
 170 {
 171         fprintf(stderr,
 172             "usage: mount_cd9660 [-begjrv] [-C charset] [-o options] [-s startsector] special node\n");
 173         exit(EX_USAGE);
 174 }
 175
 176 static int
 177 get_ssector(const char *dev)
 178 {
 179         struct ioc_toc_header h;
 180         struct ioc_read_toc_entry t;
 181         struct cd_toc_entry toc_buffer[100];
 182         int fd, ntocentries, i;
 183
 184         if ((fd = open(dev, O_RDONLY)) == -1)
 185                 return -1;
 186         if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
 187                 close(fd);
 188                 return -1;
 189         }
 190
 191         ntocentries = h.ending_track - h.starting_track + 1;
 192         if (ntocentries > 100) {
 193                 /* unreasonable, only 100 allowed */
 194                 close(fd);
 195                 return -1;
 196         }
 197         t.address_format = CD_LBA_FORMAT;
 198         t.starting_track = 0;
 199         t.data_len = ntocentries * sizeof(struct cd_toc_entry);
 200         t.data = toc_buffer;
 201
 202         if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
 203                 close(fd);
 204                 return -1;
 205         }
 206         close(fd);
 207
 208         for (i = ntocentries - 1; i >= 0; i--)
 209                 if ((toc_buffer[i].control & 4) != 0)
 210                         /* found a data track */
 211                         break;
 212         if (i < 0)
 213                 return -1;
 214
 215         return ntohl(toc_buffer[i].addr.lba);
 216 }