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/*-
* Copyright (c) 2005 Takanori Watanabe
* All rights reserved.
*
* 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <geom/geom.h>
#include <geom/label/g_label.h>
#define NTFS_A_VOLUMENAME 0x60
#define NTFS_FILEMAGIC ((uint32_t)(0x454C4946))
#define NTFS_VOLUMEINO 3
#define G_LABEL_NTFS_DIR "ntfs"
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;
uint8_t bf_mftrecsz;
uint32_t bf_ibsz;
uint32_t bf_volsn;
} __packed;
static void
g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
struct ntfs_bootfile *bf;
struct ntfs_filerec *fr;
struct ntfs_attr *atr;
off_t voloff;
char *filerecp, *ap;
char mftrecsz, vnchar;
int recsize, j;
g_topology_assert_not();
label[0] = '\0';
pp = cp->provider;
filerecp = NULL;
bf = (struct ntfs_bootfile *)g_read_data(cp, 0, pp->sectorsize, NULL);
if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0)
goto done;
mftrecsz = (char)bf->bf_mftrecsz;
recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
if (recsize % pp->sectorsize != 0)
goto done;
voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
recsize * NTFS_VOLUMEINO;
if (voloff % pp->sectorsize != 0)
goto done;
filerecp = g_read_data(cp, voloff, recsize, NULL);
if (filerecp == NULL)
goto done;
fr = (struct ntfs_filerec *)filerecp;
if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
goto done;
for (ap = filerecp + fr->fr_attroff;
atr = (struct ntfs_attr *)ap, atr->a_type != -1;
ap += atr->reclen) {
if (atr->a_type == NTFS_A_VOLUMENAME) {
if(atr->a_datalen >= size *2){
label[0] = 0;
goto done;
}
/*
*UNICODE to ASCII.
* Should we need to use iconv(9)?
*/
for (j = 0; j < atr->a_datalen; j++) {
vnchar = *(ap + atr->a_dataoff + j);
if (j & 1) {
if (vnchar) {
label[0] = 0;
goto done;
}
} else {
label[j / 2] = vnchar;
}
}
label[j / 2] = 0;
break;
}
}
done:
if (bf != NULL)
g_free(bf);
if (filerecp != NULL)
g_free(filerecp);
}
struct g_label_desc g_label_ntfs = {
.ld_taste = g_label_ntfs_taste,
.ld_dir = G_LABEL_NTFS_DIR,
.ld_enabled = 1
};
G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes");
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