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libntfs/source/ntfs.c

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/**
* ntfs.c - Simple functionality for startup, mounting and unmounting of NTFS-based devices.
*
* Copyright (c) 2009 Rhys "Shareese" Koedijk
* Copyright (c) 2006 Michael "Chishm" Chisholm
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "ntfs.h"
#include "ntfsinternal.h"
#include "ntfsfile.h"
#include "ntfsdir.h"
#include "gekko_io.h"
#include "cache.h"
// NTFS device driver devoptab
static const devoptab_t devops_ntfs = {
NULL, /* Device name */
sizeof (ntfs_file_state),
ntfs_open_r,
ntfs_close_r,
ntfs_write_r,
ntfs_read_r,
ntfs_seek_r,
ntfs_fstat_r,
ntfs_stat_r,
ntfs_link_r,
ntfs_unlink_r,
ntfs_chdir_r,
ntfs_rename_r,
ntfs_mkdir_r,
sizeof (ntfs_dir_state),
ntfs_diropen_r,
ntfs_dirreset_r,
ntfs_dirnext_r,
ntfs_dirclose_r,
ntfs_statvfs_r,
ntfs_ftruncate_r,
ntfs_fsync_r,
NULL /* Device data */
};
void ntfsInit (void)
{
static bool isInit = false;
// Initialise ntfs-3g (if not already done so)
if (!isInit) {
isInit = true;
// Set the log handler
#ifdef NTFS_ENABLE_LOG
ntfs_log_set_handler(ntfs_log_handler_stderr);
#else
ntfs_log_set_handler(ntfs_log_handler_null);
#endif
// Set our current local
ntfs_set_locale();
}
return;
}
int ntfsFindPartitions (const DISC_INTERFACE *interface, sec_t **partitions)
{
MASTER_BOOT_RECORD mbr;
PARTITION_RECORD *partition = NULL;
sec_t partition_starts[NTFS_MAX_PARTITIONS] = {0};
int partition_count = 0;
sec_t part_lba = 0;
int i;
union {
u8 buffer[512];
MASTER_BOOT_RECORD mbr;
EXTENDED_BOOT_RECORD ebr;
NTFS_BOOT_SECTOR boot;
} sector;
// Sanity check
if (!interface) {
errno = EINVAL;
return -1;
}
if (!partitions)
return 0;
// Initialise ntfs-3g
ntfsInit();
// Start the device and check that it is inserted
if (!interface->startup()) {
errno = EIO;
return -1;
}
if (!interface->isInserted()) {
return 0;
}
// Read the first sector on the device
if (!interface->readSectors(0, 1, &sector.buffer)) {
errno = EIO;
return -1;
}
// If this is the devices master boot record
if (sector.mbr.signature == MBR_SIGNATURE) {
memcpy(&mbr, &sector, sizeof(MASTER_BOOT_RECORD));
ntfs_log_debug("Valid Master Boot Record found\n");
// Search the partition table for all NTFS partitions (max. 4 primary partitions)
for (i = 0; i < 4; i++) {
partition = &mbr.partitions[i];
part_lba = le32_to_cpu(mbr.partitions[i].lba_start);
ntfs_log_debug("Partition %i: %s, sector %d, type 0x%x\n", i + 1,
partition->status == PARTITION_STATUS_BOOTABLE ? "bootable (active)" : "non-bootable",
part_lba, partition->type);
// Figure out what type of partition this is
switch (partition->type) {
// Ignore empty partitions
case PARTITION_TYPE_EMPTY:
continue;
// NTFS partition
case PARTITION_TYPE_NTFS: {
ntfs_log_debug("Partition %i: Claims to be NTFS\n", i + 1);
// Read and validate the NTFS partition
if (interface->readSectors(part_lba, 1, &sector)) {
if (sector.boot.oem_id == NTFS_OEM_ID) {
ntfs_log_debug("Partition %i: Valid NTFS boot sector found\n", i + 1);
if (partition_count < NTFS_MAX_PARTITIONS) {
partition_starts[partition_count] = part_lba;
partition_count++;
}
} else {
ntfs_log_debug("Partition %i: Invalid NTFS boot sector, not actually NTFS\n", i + 1);
}
}
break;
}
// DOS 3.3+ or Windows 95 extended partition
case PARTITION_TYPE_DOS33_EXTENDED:
case PARTITION_TYPE_WIN95_EXTENDED: {
ntfs_log_debug("Partition %i: Claims to be Extended\n", i + 1);
// Walk the extended partition chain, finding all NTFS partitions within it
sec_t ebr_lba = part_lba;
sec_t next_erb_lba = 0;
do {
// Read and validate the extended boot record
if (interface->readSectors(ebr_lba + next_erb_lba, 1, &sector)) {
if (sector.ebr.signature == EBR_SIGNATURE) {
ntfs_log_debug("Logical Partition @ %d: type 0x%x\n", ebr_lba + next_erb_lba,
sector.ebr.partition.status == PARTITION_STATUS_BOOTABLE ? "bootable (active)" : "non-bootable",
sector.ebr.partition.type);
// Get the start sector of the current partition
// and the next extended boot record in the chain
part_lba = ebr_lba + next_erb_lba + le32_to_cpu(sector.ebr.partition.lba_start);
next_erb_lba = le32_to_cpu(sector.ebr.next_ebr.lba_start);
// Check if this partition has a valid NTFS boot record
if (interface->readSectors(part_lba, 1, &sector)) {
if (sector.boot.oem_id == NTFS_OEM_ID) {
ntfs_log_debug("Logical Partition @ %d: Valid NTFS boot sector found\n", part_lba);
if(sector.ebr.partition.type != PARTITION_TYPE_NTFS) {
ntfs_log_warning("Logical Partition @ %d: Is NTFS but type is 0x%x; 0x%x was expected\n", part_lba, sector.ebr.partition.type, PARTITION_TYPE_NTFS);
}
if (partition_count < NTFS_MAX_PARTITIONS) {
partition_starts[partition_count] = part_lba;
partition_count++;
}
}
}
} else {
next_erb_lba = 0;
}
}
} while (next_erb_lba);
break;
}
// Unknown or unsupported partition type
default: {
// Check if this partition has a valid NTFS boot record anyway,
// it might be misrepresented due to a lazy partition editor
if (interface->readSectors(part_lba, 1, &sector)) {
if (sector.boot.oem_id == NTFS_OEM_ID) {
ntfs_log_debug("Partition %i: Valid NTFS boot sector found\n", i + 1);
if(partition->type != PARTITION_TYPE_NTFS) {
ntfs_log_warning("Partition %i: Is NTFS but type is 0x%x; 0x%x was expected\n", i + 1, partition->type, PARTITION_TYPE_NTFS);
}
if (partition_count < NTFS_MAX_PARTITIONS) {
partition_starts[partition_count] = part_lba;
partition_count++;
}
}
}
break;
}
}
}
// Else it is assumed this device has no master boot record
} else {
ntfs_log_debug("No Master Boot Record was found!\n");
// As a last-ditched effort, search the first 64 sectors of the device for stray NTFS partitions
for (i = 0; i < 64; i++) {
if (interface->readSectors(i, 1, &sector)) {
if (sector.boot.oem_id == NTFS_OEM_ID) {
ntfs_log_debug("Valid NTFS boot sector found at sector %d!\n", i);
if (partition_count < NTFS_MAX_PARTITIONS) {
partition_starts[partition_count] = i;
partition_count++;
}
}
}
}
}
// Return the found partitions (if any)
if (partition_count > 0) {
*partitions = (sec_t*)ntfs_alloc(sizeof(sec_t) * partition_count);
if (*partitions) {
memcpy(*partitions, &partition_starts, sizeof(sec_t) * partition_count);
return partition_count;
}
}
return 0;
}
int ntfsMountAll (ntfs_md **mounts, u32 flags)
{
const INTERFACE_ID *discs = ntfsGetDiscInterfaces();
const INTERFACE_ID *disc = NULL;
ntfs_md mount_points[NTFS_MAX_MOUNTS];
sec_t *partitions = NULL;
int mount_count = 0;
int partition_count = 0;
char name[128];
int i, j, k;
// Initialise ntfs-3g
ntfsInit();
// Find and mount all NTFS partitions on all known devices
for (i = 0; discs[i].name != NULL && discs[i].interface != NULL; i++) {
disc = &discs[i];
partition_count = ntfsFindPartitions(disc->interface, &partitions);
if (partition_count > 0 && partitions) {
for (j = 0, k = 0; j < partition_count; j++) {
// Find the next unused mount name
do {
sprintf(name, "%s%i", NTFS_MOUNT_PREFIX, k++);
if (k >= NTFS_MAX_MOUNTS) {
ntfs_free(partitions);
errno = EADDRNOTAVAIL;
return -1;
}
} while (ntfsGetDevice(name, false));
// Mount the partition
if (mount_count < NTFS_MAX_MOUNTS) {
if (ntfsMount(name, disc->interface, partitions[j], CACHE_DEFAULT_PAGE_SIZE, CACHE_DEFAULT_PAGE_COUNT, flags)) {
strcpy(mount_points[mount_count].name, name);
mount_points[mount_count].interface = disc->interface;
mount_points[mount_count].startSector = partitions[j];
mount_count++;
}
}
}
ntfs_free(partitions);
}
}
// Return the mounts (if any)
if (mount_count > 0 && mounts) {
*mounts = (ntfs_md*)ntfs_alloc(sizeof(ntfs_md) * mount_count);
if (*mounts) {
memcpy(*mounts, &mount_points, sizeof(ntfs_md) * mount_count);
return mount_count;
}
}
return 0;
}
int ntfsMountDevice (const DISC_INTERFACE *interface, ntfs_md **mounts, u32 flags)
{
const INTERFACE_ID *discs = ntfsGetDiscInterfaces();
const INTERFACE_ID *disc = NULL;
ntfs_md mount_points[NTFS_MAX_MOUNTS];
sec_t *partitions = NULL;
int mount_count = 0;
int partition_count = 0;
char name[128];
int i, j, k;
// Sanity check
if (!interface) {
errno = EINVAL;
return -1;
}
// Initialise ntfs-3g
ntfsInit();
// Find the specified device then find and mount all NTFS partitions on it
for (i = 0; discs[i].name != NULL && discs[i].interface != NULL; i++) {
if (discs[i].interface == interface) {
disc = &discs[i];
partition_count = ntfsFindPartitions(disc->interface, &partitions);
if (partition_count > 0 && partitions) {
for (j = 0, k = 0; j < partition_count; j++) {
// Find the next unused mount name
do {
sprintf(name, "%s%i", NTFS_MOUNT_PREFIX, k++);
if (k >= NTFS_MAX_MOUNTS) {
ntfs_free(partitions);
errno = EADDRNOTAVAIL;
return -1;
}
} while (ntfsGetDevice(name, false));
// Mount the partition
if (mount_count < NTFS_MAX_MOUNTS) {
if (ntfsMount(name, disc->interface, partitions[j], CACHE_DEFAULT_PAGE_SIZE, CACHE_DEFAULT_PAGE_COUNT, flags)) {
strcpy(mount_points[mount_count].name, name);
mount_points[mount_count].interface = disc->interface;
mount_points[mount_count].startSector = partitions[j];
mount_count++;
}
}
}
ntfs_free(partitions);
}
break;
}
}
// If we couldn't find the device then return with error status
if (!disc) {
errno = ENODEV;
return -1;
}
// Return the mounts (if any)
if (mount_count > 0 && mounts) {
*mounts = (ntfs_md*)ntfs_alloc(sizeof(ntfs_md) * mount_count);
if (*mounts) {
memcpy(*mounts, &mount_points, sizeof(ntfs_md) * mount_count);
return mount_count;
}
}
return 0;
}
bool ntfsMount (const char *name, const DISC_INTERFACE *interface, sec_t startSector, u32 cachePageCount, u32 cachePageSize, u32 flags)
{
ntfs_vd *vd = NULL;
gekko_fd *fd = NULL;
// Sanity check
if (!name || !interface) {
errno = EINVAL;
return false;
}
// Initialise ntfs-3g
ntfsInit();
// Check that the requested mount name is free
if (ntfsGetDevice(name, false)) {
errno = EADDRINUSE;
return false;
}
// Check that we can at least read from this device
if (!(interface->features & FEATURE_MEDIUM_CANREAD)) {
errno = EPERM;
return false;
}
// Allocate the volume descriptor
vd = (ntfs_vd*)ntfs_alloc(sizeof(ntfs_vd));
if (!vd) {
errno = ENOMEM;
return false;
}
// Setup the volume descriptor
vd->id = interface->ioType;
vd->flags = 0;
vd->uid = 0;
vd->gid = 0;
vd->fmask = 0;
vd->dmask = 0;
vd->atime = ((flags & NTFS_UPDATE_ACCESS_TIMES) ? ATIME_ENABLED : ATIME_DISABLED);
vd->showHiddenFiles = (flags & NTFS_SHOW_HIDDEN_FILES);
vd->showSystemFiles = (flags & NTFS_SHOW_SYSTEM_FILES);
// Allocate the device driver descriptor
fd = (gekko_fd*)ntfs_alloc(sizeof(gekko_fd));
if (!fd) {
ntfs_free(vd);
errno = ENOMEM;
return false;
}
// Setup the device driver descriptor
fd->interface = interface;
fd->startSector = startSector;
fd->sectorSize = 0;
fd->sectorCount = 0;
fd->cachePageCount = cachePageCount;
fd->cachePageSize = cachePageSize;
// Allocate the device driver
vd->dev = ntfs_device_alloc(name, 0, &ntfs_device_gekko_io_ops, fd);
if (!vd->dev) {
ntfs_free(fd);
ntfs_free(vd);
return false;
}
// Build the mount flags
if (flags & NTFS_READ_ONLY)
vd->flags |= MS_RDONLY;
else
{
if (!(interface->features & FEATURE_MEDIUM_CANWRITE))
vd->flags |= MS_RDONLY;
if ((interface->features & FEATURE_MEDIUM_CANREAD) && (interface->features & FEATURE_MEDIUM_CANWRITE))
vd->flags |= MS_EXCLUSIVE;
}
if (flags & NTFS_RECOVER)
vd->flags |= MS_RECOVER;
if (flags & NTFS_IGNORE_HIBERFILE)
vd->flags |= MS_IGNORE_HIBERFILE;
if (vd->flags & MS_RDONLY)
ntfs_log_debug("Mounting \"%s\" as read-only\n", name);
// Mount the device
vd->vol = ntfs_device_mount(vd->dev, vd->flags);
if (!vd->vol) {
switch(ntfs_volume_error(errno)) {
case NTFS_VOLUME_NOT_NTFS: errno = EINVALPART; break;
case NTFS_VOLUME_CORRUPT: errno = EINVALPART; break;
case NTFS_VOLUME_HIBERNATED: errno = EHIBERNATED; break;
case NTFS_VOLUME_UNCLEAN_UNMOUNT: errno = EDIRTY; break;
default: errno = EINVAL; break;
}
ntfs_device_free(vd->dev);
ntfs_free(vd);
return false;
}
if (flags & NTFS_IGNORE_CASE)
ntfs_set_ignore_case(vd->vol);
// Initialise the volume descriptor
if (ntfsInitVolume(vd)) {
ntfs_umount(vd->vol, true);
ntfs_free(vd);
return false;
}
// Add the device to the devoptab table
if (ntfsAddDevice(name, vd)) {
ntfsDeinitVolume(vd);
ntfs_umount(vd->vol, true);
ntfs_free(vd);
return false;
}
return true;
}
void ntfsUnmount (const char *name, bool force)
{
ntfs_vd *vd = NULL;
// Get the devices volume descriptor
vd = ntfsGetVolume(name);
if (!vd)
return;
// Remove the device from the devoptab table
ntfsRemoveDevice(name);
// Deinitialise the volume descriptor
ntfsDeinitVolume(vd);
// Unmount the volume
ntfs_umount(vd->vol, force);
// Free the volume descriptor
ntfs_free(vd);
return;
}
const char *ntfsGetVolumeName (const char *name)
{
ntfs_vd *vd = NULL;
// Sanity check
if (!name) {
errno = EINVAL;
return NULL;
}
// Get the devices volume descriptor
vd = ntfsGetVolume(name);
if (!vd) {
errno = ENODEV;
return NULL;
}
return vd->vol->vol_name;
}
bool ntfsSetVolumeName (const char *name, const char *volumeName)
{
ntfs_vd *vd = NULL;
ntfs_attr *na = NULL;
ntfschar *ulabel = NULL;
int ulabel_len;
// Sanity check
if (!name) {
errno = EINVAL;
return false;
}
// Get the devices volume descriptor
vd = ntfsGetVolume(name);
if (!vd) {
errno = ENODEV;
return false;
}
// Lock
ntfsLock(vd);
// Convert the new volume name to unicode
ulabel_len = ntfsLocalToUnicode(volumeName, &ulabel) * sizeof(ntfschar);
if (ulabel_len < 0) {
ntfsUnlock(vd);
errno = EINVAL;
return false;
}
// Check if the volume name attribute exists
na = ntfs_attr_open(vd->vol->vol_ni, AT_VOLUME_NAME, NULL, 0);
if (na) {
// It does, resize it to match the length of the new volume name
if (ntfs_attr_truncate(na, ulabel_len)) {
free(ulabel);
ntfsUnlock(vd);
return false;
}
// Write the new volume name
if (ntfs_attr_pwrite(na, 0, ulabel_len, ulabel) != ulabel_len) {
free(ulabel);
ntfsUnlock(vd);
return false;
}
} else {
// It doesn't, create it now
if (ntfs_attr_add(vd->vol->vol_ni, AT_VOLUME_NAME, NULL, 0, (u8*)ulabel, ulabel_len)) {
free(ulabel);
ntfsUnlock(vd);
return false;
}
}
// Reset the volumes name cache (as it has now been changed)
vd->name[0] = '\0';
// Close the volume name attribute
if (na)
ntfs_attr_close(na);
// Sync the volume node
if (ntfs_inode_sync(vd->vol->vol_ni)) {
free(ulabel);
ntfsUnlock(vd);
return false;
}
// Clean up
free(ulabel);
// Unlock
ntfsUnlock(vd);
return true;
}
const devoptab_t *ntfsGetDevOpTab (void)
{
return &devops_ntfs;
}
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