1 | /*
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2 | * volume_id - reads filesystem label and uuid
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3 | *
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4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with this library; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 | */
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20 |
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21 | #include "volume_id_internal.h"
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22 |
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23 | struct ntfs_super_block {
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24 | uint8_t jump[3];
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25 | uint8_t oem_id[8];
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26 | uint16_t bytes_per_sector;
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27 | uint8_t sectors_per_cluster;
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28 | uint16_t reserved_sectors;
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29 | uint8_t fats;
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30 | uint16_t root_entries;
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31 | uint16_t sectors;
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32 | uint8_t media_type;
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33 | uint16_t sectors_per_fat;
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34 | uint16_t sectors_per_track;
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35 | uint16_t heads;
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36 | uint32_t hidden_sectors;
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37 | uint32_t large_sectors;
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38 | uint16_t unused[2];
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39 | uint64_t number_of_sectors;
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40 | uint64_t mft_cluster_location;
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41 | uint64_t mft_mirror_cluster_location;
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42 | int8_t cluster_per_mft_record;
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43 | uint8_t reserved1[3];
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44 | int8_t cluster_per_index_record;
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45 | uint8_t reserved2[3];
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46 | uint8_t volume_serial[8];
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47 | uint16_t checksum;
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48 | } PACKED;
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49 |
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50 | struct master_file_table_record {
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51 | uint8_t magic[4];
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52 | uint16_t usa_ofs;
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53 | uint16_t usa_count;
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54 | uint64_t lsn;
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55 | uint16_t sequence_number;
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56 | uint16_t link_count;
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57 | uint16_t attrs_offset;
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58 | uint16_t flags;
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59 | uint32_t bytes_in_use;
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60 | uint32_t bytes_allocated;
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61 | } PACKED;
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62 |
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63 | struct file_attribute {
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64 | uint32_t type;
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65 | uint32_t len;
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66 | uint8_t non_resident;
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67 | uint8_t name_len;
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68 | uint16_t name_offset;
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69 | uint16_t flags;
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70 | uint16_t instance;
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71 | uint32_t value_len;
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72 | uint16_t value_offset;
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73 | } PACKED;
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74 |
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75 | struct volume_info {
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76 | uint64_t reserved;
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77 | uint8_t major_ver;
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78 | uint8_t minor_ver;
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79 | } PACKED;
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80 |
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81 | #define MFT_RECORD_VOLUME 3
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82 | #define MFT_RECORD_ATTR_VOLUME_NAME 0x60
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83 | #define MFT_RECORD_ATTR_VOLUME_INFO 0x70
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84 | #define MFT_RECORD_ATTR_OBJECT_ID 0x40
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85 | #define MFT_RECORD_ATTR_END 0xffffffffu
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86 |
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87 | int FAST_FUNC volume_id_probe_ntfs(struct volume_id *id /*,uint64_t off*/)
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88 | {
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89 | #define off ((uint64_t)0)
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90 | unsigned sector_size;
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91 | unsigned cluster_size;
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92 | uint64_t mft_cluster;
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93 | uint64_t mft_off;
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94 | unsigned mft_record_size;
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95 | unsigned attr_type;
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96 | unsigned attr_off;
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97 | unsigned attr_len;
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98 | unsigned val_off;
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99 | unsigned val_len;
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100 | struct master_file_table_record *mftr;
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101 | struct ntfs_super_block *ns;
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102 | const uint8_t *buf;
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103 | const uint8_t *val;
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104 |
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105 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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106 |
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107 | ns = volume_id_get_buffer(id, off, 0x200);
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108 | if (ns == NULL)
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109 | return -1;
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110 |
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111 | if (memcmp(ns->oem_id, "NTFS", 4) != 0)
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112 | return -1;
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113 |
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114 | volume_id_set_uuid(id, ns->volume_serial, UUID_NTFS);
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115 |
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116 | sector_size = le16_to_cpu(ns->bytes_per_sector);
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117 | cluster_size = ns->sectors_per_cluster * sector_size;
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118 | mft_cluster = le64_to_cpu(ns->mft_cluster_location);
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119 | mft_off = mft_cluster * cluster_size;
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120 |
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121 | if (ns->cluster_per_mft_record < 0)
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122 | /* size = -log2(mft_record_size); normally 1024 Bytes */
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123 | mft_record_size = 1 << -ns->cluster_per_mft_record;
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124 | else
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125 | mft_record_size = ns->cluster_per_mft_record * cluster_size;
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126 |
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127 | dbg("sectorsize 0x%x", sector_size);
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128 | dbg("clustersize 0x%x", cluster_size);
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129 | dbg("mftcluster %llu", (unsigned long long) mft_cluster);
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130 | dbg("mftoffset 0x%llx", (unsigned long long) mft_off);
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131 | dbg("cluster per mft_record %i", ns->cluster_per_mft_record);
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132 | dbg("mft record size %i", mft_record_size);
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133 |
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134 | buf = volume_id_get_buffer(id, off + mft_off + (MFT_RECORD_VOLUME * mft_record_size),
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135 | mft_record_size);
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136 | if (buf == NULL)
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137 | goto found;
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138 |
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139 | mftr = (struct master_file_table_record*) buf;
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140 |
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141 | dbg("mftr->magic '%c%c%c%c'", mftr->magic[0], mftr->magic[1], mftr->magic[2], mftr->magic[3]);
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142 | if (memcmp(mftr->magic, "FILE", 4) != 0)
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143 | goto found;
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144 |
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145 | attr_off = le16_to_cpu(mftr->attrs_offset);
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146 | dbg("file $Volume's attributes are at offset %i", attr_off);
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147 |
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148 | while (1) {
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149 | struct file_attribute *attr;
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150 |
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151 | attr = (struct file_attribute*) &buf[attr_off];
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152 | attr_type = le32_to_cpu(attr->type);
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153 | attr_len = le16_to_cpu(attr->len);
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154 | val_off = le16_to_cpu(attr->value_offset);
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155 | val_len = le32_to_cpu(attr->value_len);
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156 | attr_off += attr_len;
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157 |
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158 | if (attr_len == 0)
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159 | break;
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160 |
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161 | if (attr_off >= mft_record_size)
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162 | break;
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163 |
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164 | if (attr_type == MFT_RECORD_ATTR_END)
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165 | break;
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166 |
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167 | dbg("found attribute type 0x%x, len %i, at offset %i",
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168 | attr_type, attr_len, attr_off);
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169 |
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170 | // if (attr_type == MFT_RECORD_ATTR_VOLUME_INFO) {
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171 | // struct volume_info *info;
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172 | // dbg("found info, len %i", val_len);
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173 | // info = (struct volume_info*) (((uint8_t *) attr) + val_off);
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174 | // snprintf(id->type_version, sizeof(id->type_version)-1,
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175 | // "%u.%u", info->major_ver, info->minor_ver);
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176 | // }
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177 |
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178 | if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
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179 | dbg("found label, len %i", val_len);
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180 | if (val_len > VOLUME_ID_LABEL_SIZE)
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181 | val_len = VOLUME_ID_LABEL_SIZE;
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182 |
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183 | val = ((uint8_t *) attr) + val_off;
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184 | // volume_id_set_label_raw(id, val, val_len);
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185 | volume_id_set_label_unicode16(id, val, LE, val_len);
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186 | }
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187 | }
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188 |
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189 | found:
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190 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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191 | // id->type = "ntfs";
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192 |
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193 | return 0;
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194 | }
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