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/*-
* Copyright (c) 2005 Takanori Watanabe
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <err.h>
#ifdef WITH_ICONV
#include <iconv.h>
#endif
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fstyp.h"
#define NTFS_A_VOLUMENAME 0x60
#define NTFS_FILEMAGIC ((uint32_t)(0x454C4946))
#define NTFS_VOLUMEINO 3
struct ntfs_attr {
uint32_t a_type;
uint32_t reclen;
uint8_t a_flag;
uint8_t a_namelen;
uint8_t a_nameoff;
uint8_t reserved1;
uint8_t a_compression;
uint8_t reserved2;
uint16_t a_index;
uint16_t a_datalen;
uint16_t reserved3;
uint16_t a_dataoff;
uint16_t a_indexed;
} __packed;
struct ntfs_filerec {
uint32_t fr_hdrmagic;
uint16_t fr_hdrfoff;
uint16_t fr_hdrfnum;
uint8_t reserved[8];
uint16_t fr_seqnum;
uint16_t fr_nlink;
uint16_t fr_attroff;
uint16_t fr_flags;
uint32_t fr_size;
uint32_t fr_allocated;
uint64_t fr_mainrec;
uint16_t fr_attrnum;
} __packed;
struct ntfs_bootfile {
uint8_t reserved1[3];
uint8_t bf_sysid[8];
uint16_t bf_bps;
uint8_t bf_spc;
uint8_t reserved2[7];
uint8_t bf_media;
uint8_t reserved3[2];
uint16_t bf_spt;
uint16_t bf_heads;
uint8_t reserver4[12];
uint64_t bf_spv;
uint64_t bf_mftcn;
uint64_t bf_mftmirrcn;
int8_t bf_mftrecsz;
uint32_t bf_ibsz;
uint32_t bf_volsn;
} __packed;
#ifdef WITH_ICONV
static void
convert_label(const void *label /* LE */, size_t labellen, char *label_out,
size_t label_sz)
{
char *label_out_orig;
iconv_t cd;
size_t rc;
/* dstname="" means convert to the current locale. */
cd = iconv_open("", NTFS_ENC);
if (cd == (iconv_t)-1) {
warn("ntfs: Could not open iconv");
return;
}
label_out_orig = label_out;
rc = iconv(cd, __DECONST(char **, &label), &labellen, &label_out,
&label_sz);
if (rc == (size_t)-1) {
warn("ntfs: iconv()");
*label_out_orig = '\0';
} else {
/* NUL-terminate result (iconv advances label_out). */
if (label_sz == 0)
label_out--;
*label_out = '\0';
}
iconv_close(cd);
}
#endif
int
fstyp_ntfs(FILE *fp, char *label, size_t size)
{
struct ntfs_bootfile *bf;
char *filerecp;
#ifdef WITH_ICONV
struct ntfs_filerec *fr;
struct ntfs_attr *atr;
off_t voloff;
char *ap;
int8_t mftrecsz;
int recsize;
#endif /* WITH_ICONV */
filerecp = NULL;
bf = (struct ntfs_bootfile *)read_buf(fp, 0, 512);
if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0)
goto fail;
#ifdef WITH_ICONV
if (!show_label)
goto ok;
mftrecsz = bf->bf_mftrecsz;
recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
recsize * NTFS_VOLUMEINO;
filerecp = read_buf(fp, voloff, recsize);
if (filerecp == NULL)
goto fail;
fr = (struct ntfs_filerec *)filerecp;
if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
goto fail;
for (ap = filerecp + fr->fr_attroff;
atr = (struct ntfs_attr *)ap, (int)atr->a_type != -1;
ap += atr->reclen) {
if (atr->a_type != NTFS_A_VOLUMENAME)
continue;
convert_label(ap + atr->a_dataoff,
atr->a_datalen, label, size);
break;
}
ok:
#else
if (show_label) {
warnx("label not available without iconv support");
memset(label, 0, size);
}
#endif /* WITH_ICONV */
free(bf);
free(filerecp);
return (0);
fail:
free(bf);
free(filerecp);
return (1);
}
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