usr.sbin/fstyp/ntfs.c

   1 /*-
   2  * Copyright (c) 2016 The DragonFly Project
   3  * Copyright (c) 2005 Takanori Watanabe
   4  * Copyright (c) 2014 The FreeBSD Foundation
   5  * All rights reserved.
   6  *
   7  * This software was developed by Edward Tomasz Napierala under sponsorship
   8  * from the FreeBSD Foundation.
   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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <stdint.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "fstyp.h"
  38
  39 #define NTFS_A_VOLUMENAME       0x60
  40 #define NTFS_FILEMAGIC          ((uint32_t)(0x454C4946))
  41 #define NTFS_VOLUMEINO          3
  42
  43 struct ntfs_attr {
  44         uint32_t        a_type;
  45         uint32_t        reclen;
  46         uint8_t         a_flag;
  47         uint8_t         a_namelen;
  48         uint8_t         a_nameoff;
  49         uint8_t         reserved1;
  50         uint8_t         a_compression;
  51         uint8_t         reserved2;
  52         uint16_t        a_index;
  53         uint16_t        a_datalen;
  54         uint16_t        reserved3;
  55         uint16_t        a_dataoff;
  56         uint16_t        a_indexed;
  57 } __packed;
  58
  59 struct ntfs_filerec {
  60         uint32_t        fr_hdrmagic;
  61         uint16_t        fr_hdrfoff;
  62         uint16_t        fr_hdrfnum;
  63         uint8_t         reserved[8];
  64         uint16_t        fr_seqnum;
  65         uint16_t        fr_nlink;
  66         uint16_t        fr_attroff;
  67         uint16_t        fr_flags;
  68         uint32_t        fr_size;
  69         uint32_t        fr_allocated;
  70         uint64_t        fr_mainrec;
  71         uint16_t        fr_attrnum;
  72 } __packed;
  73
  74 struct ntfs_bootfile {
  75         uint8_t         reserved1[3];
  76         uint8_t         bf_sysid[8];
  77         uint16_t        bf_bps;
  78         uint8_t         bf_spc;
  79         uint8_t         reserved2[7];
  80         uint8_t         bf_media;
  81         uint8_t         reserved3[2];
  82         uint16_t        bf_spt;
  83         uint16_t        bf_heads;
  84         uint8_t         reserver4[12];
  85         uint64_t        bf_spv;
  86         uint64_t        bf_mftcn;
  87         uint64_t        bf_mftmirrcn;
  88         int8_t          bf_mftrecsz;
  89         uint32_t        bf_ibsz;
  90         uint32_t        bf_volsn;
  91 } __packed;
  92
  93 int
  94 fstyp_ntfs(FILE *fp, char *label, size_t size)
  95 {
  96         struct ntfs_bootfile *bf;
  97         struct ntfs_filerec *fr;
  98         struct ntfs_attr *atr;
  99         off_t voloff;
 100         char *filerecp, *ap;
 101         int8_t mftrecsz;
 102         char vnchar;
 103         int recsize, j;
 104
 105         filerecp = NULL;
 106
 107         bf = (struct ntfs_bootfile *)read_buf(fp, 0, 512);
 108         if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0)
 109                 goto fail;
 110
 111         mftrecsz = bf->bf_mftrecsz;
 112         recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
 113
 114         voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
 115             recsize * NTFS_VOLUMEINO;
 116
 117         filerecp = read_buf(fp, voloff, recsize);
 118         if (filerecp == NULL)
 119                 goto fail;
 120         fr = (struct ntfs_filerec *)filerecp;
 121
 122         if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
 123                 goto fail;
 124
 125         for (ap = filerecp + fr->fr_attroff;
 126             atr = (struct ntfs_attr *)ap, (int)atr->a_type != -1;
 127             ap += atr->reclen) {
 128                 if (atr->a_type == NTFS_A_VOLUMENAME) {
 129                         if(atr->a_datalen >= size *2){
 130                                 goto fail;
 131                         }
 132                         /*
 133                          *UNICODE to ASCII.
 134                          * Should we need to use iconv(9)?
 135                          */
 136                         for (j = 0; j < atr->a_datalen; j++) {
 137                                 vnchar = *(ap + atr->a_dataoff + j);
 138                                 if (j & 1) {
 139                                         if (vnchar) {
 140                                                 goto fail;
 141                                         }
 142                                 } else {
 143                                         label[j / 2] = vnchar;
 144                                 }
 145                         }
 146                         label[j / 2] = 0;
 147                         break;
 148                 }
 149         }
 150
 151         free(bf);
 152         free(filerecp);
 153
 154         return (0);
 155
 156 fail:
 157         free(bf);
 158         free(filerecp);
 159
 160         return (1);
 161 }