195 lines
5.3 KiB
C
195 lines
5.3 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.h"
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struct ntfs_super_block {
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uint8_t jump[3];
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uint8_t oem_id[8];
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uint16_t bytes_per_sector;
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uint8_t sectors_per_cluster;
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uint16_t reserved_sectors;
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uint8_t fats;
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uint16_t root_entries;
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uint16_t sectors;
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uint8_t media_type;
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uint16_t sectors_per_fat;
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uint16_t sectors_per_track;
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uint16_t heads;
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uint32_t hidden_sectors;
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uint32_t large_sectors;
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uint16_t unused[2];
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uint64_t number_of_sectors;
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uint64_t mft_cluster_location;
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uint64_t mft_mirror_cluster_location;
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int8_t cluster_per_mft_record;
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uint8_t reserved1[3];
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int8_t cluster_per_index_record;
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uint8_t reserved2[3];
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uint8_t volume_serial[8];
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uint16_t checksum;
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} __attribute__((__packed__));
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struct master_file_table_record {
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uint8_t magic[4];
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uint16_t usa_ofs;
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uint16_t usa_count;
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uint64_t lsn;
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uint16_t sequence_number;
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uint16_t link_count;
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uint16_t attrs_offset;
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uint16_t flags;
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uint32_t bytes_in_use;
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uint32_t bytes_allocated;
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} __attribute__((__packed__));
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struct file_attribute {
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uint32_t type;
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uint32_t len;
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uint8_t non_resident;
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uint8_t name_len;
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uint16_t name_offset;
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uint16_t flags;
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uint16_t instance;
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uint32_t value_len;
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uint16_t value_offset;
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} __attribute__((__packed__));
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struct volume_info {
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uint64_t reserved;
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uint8_t major_ver;
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uint8_t minor_ver;
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} __attribute__((__packed__));
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#define MFT_RECORD_VOLUME 3
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#define MFT_RECORD_ATTR_VOLUME_NAME 0x60
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#define MFT_RECORD_ATTR_VOLUME_INFO 0x70
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#define MFT_RECORD_ATTR_OBJECT_ID 0x40
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#define MFT_RECORD_ATTR_END 0xffffffffu
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int volume_id_probe_ntfs(struct volume_id *id /*,uint64_t off*/)
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{
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#define off ((uint64_t)0)
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unsigned sector_size;
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unsigned cluster_size;
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uint64_t mft_cluster;
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uint64_t mft_off;
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unsigned mft_record_size;
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unsigned attr_type;
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unsigned attr_off;
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unsigned attr_len;
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unsigned val_off;
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unsigned val_len;
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struct master_file_table_record *mftr;
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struct ntfs_super_block *ns;
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const uint8_t *buf;
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const uint8_t *val;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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ns = volume_id_get_buffer(id, off, 0x200);
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if (ns == NULL)
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return -1;
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if (memcmp(ns->oem_id, "NTFS", 4) != 0)
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return -1;
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volume_id_set_uuid(id, ns->volume_serial, UUID_NTFS);
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sector_size = le16_to_cpu(ns->bytes_per_sector);
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cluster_size = ns->sectors_per_cluster * sector_size;
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mft_cluster = le64_to_cpu(ns->mft_cluster_location);
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mft_off = mft_cluster * cluster_size;
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if (ns->cluster_per_mft_record < 0)
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/* size = -log2(mft_record_size); normally 1024 Bytes */
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mft_record_size = 1 << -ns->cluster_per_mft_record;
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else
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mft_record_size = ns->cluster_per_mft_record * cluster_size;
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dbg("sectorsize 0x%x", sector_size);
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dbg("clustersize 0x%x", cluster_size);
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dbg("mftcluster %llu", (unsigned long long) mft_cluster);
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dbg("mftoffset 0x%llx", (unsigned long long) mft_off);
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dbg("cluster per mft_record %i", ns->cluster_per_mft_record);
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dbg("mft record size %i", mft_record_size);
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buf = volume_id_get_buffer(id, off + mft_off + (MFT_RECORD_VOLUME * mft_record_size),
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mft_record_size);
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if (buf == NULL)
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goto found;
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mftr = (struct master_file_table_record*) buf;
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dbg("mftr->magic '%c%c%c%c'", mftr->magic[0], mftr->magic[1], mftr->magic[2], mftr->magic[3]);
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if (memcmp(mftr->magic, "FILE", 4) != 0)
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goto found;
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attr_off = le16_to_cpu(mftr->attrs_offset);
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dbg("file $Volume's attributes are at offset %i", attr_off);
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while (1) {
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struct file_attribute *attr;
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attr = (struct file_attribute*) &buf[attr_off];
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attr_type = le32_to_cpu(attr->type);
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attr_len = le16_to_cpu(attr->len);
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val_off = le16_to_cpu(attr->value_offset);
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val_len = le32_to_cpu(attr->value_len);
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attr_off += attr_len;
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if (attr_len == 0)
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break;
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if (attr_off >= mft_record_size)
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break;
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if (attr_type == MFT_RECORD_ATTR_END)
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break;
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dbg("found attribute type 0x%x, len %i, at offset %i",
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attr_type, attr_len, attr_off);
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// if (attr_type == MFT_RECORD_ATTR_VOLUME_INFO) {
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// struct volume_info *info;
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// dbg("found info, len %i", val_len);
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// info = (struct volume_info*) (((uint8_t *) attr) + val_off);
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// snprintf(id->type_version, sizeof(id->type_version)-1,
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// "%u.%u", info->major_ver, info->minor_ver);
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// }
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if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
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dbg("found label, len %i", val_len);
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if (val_len > VOLUME_ID_LABEL_SIZE)
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val_len = VOLUME_ID_LABEL_SIZE;
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val = ((uint8_t *) attr) + val_off;
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// volume_id_set_label_raw(id, val, val_len);
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volume_id_set_label_unicode16(id, val, LE, val_len);
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}
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}
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found:
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// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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// id->type = "ntfs";
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return 0;
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}
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