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wipe the tails of mft records that are in use 

(Logical change 1.206)
edge.strict_endians
flatcap.org!ntfs 2003-10-12 23:11:03 +00:00
parent 6f0ffca0c0
commit 3234ada8a2
1 changed files with 61 additions and 16 deletions
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77
ntfsprogs/ntfswipe.c
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@ -430,39 +430,78 @@ s64 wipe_mft (ntfs_volume *vol, int byte, enum action act)
s64 i;
s64 total = 0;
s64 result = 0;
int size = 0;
u8 *buffer = NULL;
if (!vol || (byte < 0))
return -1;
if (act == act_wipe) {
buffer = malloc (vol->mft_record_size);
if (!buffer) {
Eprintf ("malloc failed\n");
return -1;
}
buffer = malloc (vol->mft_record_size);
if (!buffer) {
Eprintf ("malloc failed\n");
return -1;
}
for (i = 0; i < vol->nr_mft_records; i++) {
if (utils_mftrec_in_use (vol, i)) {
total += 300; // some token amount?
result = ntfs_attr_mst_pread (vol->mft_na, vol->mft_record_size * i,
1, vol->mft_record_size, buffer);
if (result != 1) {
Eprintf ("error attr mst read %lld\n", i);
total = -1; // XXX just negate result?
goto free;
}
// We know that the end marker will only take 4 bytes
size = *((u32*) (buffer + 0x18)) - 4;
if (act == act_info) {
//printf ("mft %d\n", size);
total += size;
continue;
}
memset (buffer + size, byte, vol->mft_record_size - size);
result = ntfs_attr_mst_pwrite (vol->mft_na, vol->mft_record_size * i,
1, vol->mft_record_size, buffer);
if (result != 1) {
Eprintf ("error attr mst write %lld\n", i);
total = -1;
goto free;
}
if ((vol->mft_record_size * (i+1)) <= vol->mftmirr_na->allocated_size)
{
// We have to reduce the update sequence number, or else...
u16 offset;
u16 usa;
offset = le16_to_cpu (*(buffer + 0x04));
usa = le16_to_cpu (*(buffer + offset));
*((u16*) (buffer + offset)) = cpu_to_le16 (usa - 1);
result = ntfs_attr_mst_pwrite (vol->mftmirr_na, vol->mft_record_size * i,
1, vol->mft_record_size, buffer);
if (result != 1) {
Eprintf ("error attr mst write %lld\n", i);
total = -1;
goto free;
}
}
total += vol->mft_record_size;
} else {
if (act == act_info) {
total += vol->mft_record_size;
continue;
}
result = ntfs_attr_mst_pread (vol->mft_na, vol->mft_record_size * i,
vol->mft_record_size / vol->sector_size, vol->sector_size, buffer);
if (result != (vol->mft_record_size / vol->sector_size)) {
Eprintf ("error attr mst read %lld\n", i);
total = -1; // XXX just negate result?
goto free;
}
// Build the record from scratch
memset (buffer, 0, vol->mft_record_size);
// Common values
*((u32*) (buffer + 0x00)) = magic_FILE; // Magic
*((u16*) (buffer + 0x06)) = cpu_to_le16 (0x0003); // USA size
*((u16*) (buffer + 0x10)) = cpu_to_le16 (0x0001); // Seq num
@ -470,11 +509,13 @@ s64 wipe_mft (ntfs_volume *vol, int byte, enum action act)
*((u16*) (buffer + 0x28)) = cpu_to_le16 (0x0001); // Attr ID
if (vol->major_ver == 3) {
// Only XP and 2K3
*((u16*) (buffer + 0x04)) = cpu_to_le16 (0x0030); // USA offset
*((u16*) (buffer + 0x14)) = cpu_to_le16 (0x0038); // Attr offset
*((u32*) (buffer + 0x18)) = cpu_to_le32 (0x00000040); // FILE usage
*((u32*) (buffer + 0x38)) = cpu_to_le32 (0xFFFFFFFF); // End marker
} else {
} else {
// Only NT and 2K
*((u16*) (buffer + 0x04)) = cpu_to_le16 (0x002A); // USA offset
*((u16*) (buffer + 0x14)) = cpu_to_le16 (0x0030); // Attr offset
*((u32*) (buffer + 0x18)) = cpu_to_le32 (0x00000038); // FILE usage
@ -908,6 +949,10 @@ int main (int argc, char *argv[])
printf ("%llu bytes were wiped\n", total);
}
if (ntfs_volume_set_flags (vol, VOLUME_IS_DIRTY) < 0) {
Eprintf ("Couldn't mark volume dirty\n");
}
result = 0;
umount:
ntfs_umount (vol, FALSE);