g_label_ntfs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005 Takanori Watanabe
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/geom/label/g_label_ntfs.c 326270 2017-11-27 15:17:37Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 
   37 #include <geom/geom.h>
   38 #include <geom/label/g_label.h>
   39 
   40 #define NTFS_A_VOLUMENAME       0x60
   41 #define NTFS_FILEMAGIC          ((uint32_t)(0x454C4946))
   42 #define NTFS_VOLUMEINO          3
   43 
   44 #define G_LABEL_NTFS_DIR        "ntfs"
   45 
   46 struct ntfs_attr {
   47         uint32_t        a_type;
   48         uint32_t        reclen;
   49         uint8_t         a_flag;
   50         uint8_t         a_namelen;
   51         uint8_t         a_nameoff;
   52         uint8_t         reserved1;
   53         uint8_t         a_compression;
   54         uint8_t         reserved2;
   55         uint16_t        a_index;
   56         uint16_t        a_datalen;
   57         uint16_t        reserved3;
   58         uint16_t        a_dataoff;
   59         uint16_t        a_indexed;
   60 } __packed;
   61 
   62 struct ntfs_filerec {
   63         uint32_t        fr_hdrmagic;
   64         uint16_t        fr_hdrfoff;
   65         uint16_t        fr_hdrfnum;
   66         uint8_t         reserved[8];
   67         uint16_t        fr_seqnum;
   68         uint16_t        fr_nlink;
   69         uint16_t        fr_attroff;
   70         uint16_t        fr_flags;
   71         uint32_t        fr_size;
   72         uint32_t        fr_allocated;
   73         uint64_t        fr_mainrec;
   74         uint16_t        fr_attrnum;
   75 } __packed;
   76 
   77 struct ntfs_bootfile {
   78         uint8_t         reserved1[3];
   79         uint8_t         bf_sysid[8];
   80         uint16_t        bf_bps;
   81         uint8_t         bf_spc;
   82         uint8_t         reserved2[7];
   83         uint8_t         bf_media;
   84         uint8_t         reserved3[2];
   85         uint16_t        bf_spt;
   86         uint16_t        bf_heads;
   87         uint8_t         reserver4[12];
   88         uint64_t        bf_spv;
   89         uint64_t        bf_mftcn;
   90         uint64_t        bf_mftmirrcn;
   91         int8_t          bf_mftrecsz;
   92         uint32_t        bf_ibsz;
   93         uint32_t        bf_volsn;
   94 } __packed;
   95 
   96 static void
   97 g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size)
   98 {
   99         struct g_provider *pp;
  100         struct ntfs_bootfile *bf;
  101         struct ntfs_filerec *fr;
  102         struct ntfs_attr *atr;
  103         off_t voloff;
  104         char *filerecp, *ap;
  105         int8_t mftrecsz;
  106         char vnchar;
  107         int recsize, j;
  108 
  109         g_topology_assert_not();
  110 
  111         label[0] = '\0';
  112         pp = cp->provider;
  113         filerecp = NULL;
  114 
  115         bf = (struct ntfs_bootfile *)g_read_data(cp, 0, pp->sectorsize, NULL);
  116         if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0)
  117                 goto done;
  118 
  119         mftrecsz = bf->bf_mftrecsz;
  120         recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
  121         if (recsize == 0 || recsize % pp->sectorsize != 0)
  122                 goto done;
  123 
  124         voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
  125             recsize * NTFS_VOLUMEINO;
  126         if (voloff % pp->sectorsize != 0)
  127                 goto done;
  128 
  129         filerecp = g_read_data(cp, voloff, recsize, NULL);
  130         if (filerecp == NULL)
  131                 goto done;
  132         fr = (struct ntfs_filerec *)filerecp;
  133 
  134         if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
  135                 goto done;
  136 
  137         for (ap = filerecp + fr->fr_attroff;
  138             atr = (struct ntfs_attr *)ap, atr->a_type != -1;
  139             ap += atr->reclen) {
  140                 if (atr->a_type == NTFS_A_VOLUMENAME) {
  141                         if(atr->a_datalen >= size *2){
  142                                 label[0] = 0;
  143                                 goto done;
  144                         }
  145                         /*
  146                          *UNICODE to ASCII.
  147                          * Should we need to use iconv(9)?
  148                          */
  149                         for (j = 0; j < atr->a_datalen; j++) {
  150                                 vnchar = *(ap + atr->a_dataoff + j);
  151                                 if (j & 1) {
  152                                         if (vnchar) {
  153                                                 label[0] = 0;
  154                                                 goto done;
  155                                         }
  156                                 } else {
  157                                         label[j / 2] = vnchar;
  158                                 }
  159                         }
  160                         label[j / 2] = 0;
  161                         break;
  162                 }
  163         }
  164 done:
  165         if (bf != NULL)
  166                 g_free(bf);
  167         if (filerecp != NULL)
  168                 g_free(filerecp);
  169 }
  170 
  171 struct g_label_desc g_label_ntfs = {
  172         .ld_taste = g_label_ntfs_taste,
  173         .ld_dir = G_LABEL_NTFS_DIR,
  174         .ld_enabled = 1
  175 };
  176 
  177 G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes");

Cache object: 743e72a3557c77dc32825f7c15d108c0

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FreeBSD/Linux Kernel Cross Reference sys/geom/label/g_label_ntfs.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_ntfs.c