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 hfs_finder_info{
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24 | uint32_t boot_folder;
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25 | uint32_t start_app;
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26 | uint32_t open_folder;
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27 | uint32_t os9_folder;
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28 | uint32_t reserved;
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29 | uint32_t osx_folder;
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30 | uint8_t id[8];
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31 | } PACKED;
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32 |
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33 | struct hfs_mdb {
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34 | uint8_t signature[2];
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35 | uint32_t cr_date;
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36 | uint32_t ls_Mod;
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37 | uint16_t atrb;
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38 | uint16_t nm_fls;
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39 | uint16_t vbm_st;
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40 | uint16_t alloc_ptr;
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41 | uint16_t nm_al_blks;
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42 | uint32_t al_blk_size;
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43 | uint32_t clp_size;
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44 | uint16_t al_bl_st;
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45 | uint32_t nxt_cnid;
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46 | uint16_t free_bks;
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47 | uint8_t label_len;
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48 | uint8_t label[27];
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49 | uint32_t vol_bkup;
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50 | uint16_t vol_seq_num;
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51 | uint32_t wr_cnt;
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52 | uint32_t xt_clump_size;
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53 | uint32_t ct_clump_size;
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54 | uint16_t num_root_dirs;
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55 | uint32_t file_count;
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56 | uint32_t dir_count;
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57 | struct hfs_finder_info finder_info;
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58 | uint8_t embed_sig[2];
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59 | uint16_t embed_startblock;
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60 | uint16_t embed_blockcount;
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61 | } PACKED;
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62 |
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63 | struct hfsplus_bnode_descriptor {
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64 | uint32_t next;
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65 | uint32_t prev;
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66 | uint8_t type;
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67 | uint8_t height;
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68 | uint16_t num_recs;
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69 | uint16_t reserved;
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70 | } PACKED;
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71 |
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72 | struct hfsplus_bheader_record {
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73 | uint16_t depth;
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74 | uint32_t root;
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75 | uint32_t leaf_count;
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76 | uint32_t leaf_head;
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77 | uint32_t leaf_tail;
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78 | uint16_t node_size;
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79 | } PACKED;
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80 |
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81 | struct hfsplus_catalog_key {
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82 | uint16_t key_len;
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83 | uint32_t parent_id;
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84 | uint16_t unicode_len;
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85 | uint8_t unicode[255 * 2];
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86 | } PACKED;
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87 |
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88 | struct hfsplus_extent {
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89 | uint32_t start_block;
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90 | uint32_t block_count;
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91 | } PACKED;
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92 |
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93 | #define HFSPLUS_EXTENT_COUNT 8
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94 | struct hfsplus_fork {
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95 | uint64_t total_size;
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96 | uint32_t clump_size;
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97 | uint32_t total_blocks;
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98 | struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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99 | } PACKED;
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100 |
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101 | struct hfsplus_vol_header {
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102 | uint8_t signature[2];
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103 | uint16_t version;
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104 | uint32_t attributes;
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105 | uint32_t last_mount_vers;
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106 | uint32_t reserved;
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107 | uint32_t create_date;
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108 | uint32_t modify_date;
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109 | uint32_t backup_date;
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110 | uint32_t checked_date;
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111 | uint32_t file_count;
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112 | uint32_t folder_count;
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113 | uint32_t blocksize;
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114 | uint32_t total_blocks;
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115 | uint32_t free_blocks;
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116 | uint32_t next_alloc;
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117 | uint32_t rsrc_clump_sz;
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118 | uint32_t data_clump_sz;
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119 | uint32_t next_cnid;
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120 | uint32_t write_count;
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121 | uint64_t encodings_bmp;
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122 | struct hfs_finder_info finder_info;
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123 | struct hfsplus_fork alloc_file;
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124 | struct hfsplus_fork ext_file;
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125 | struct hfsplus_fork cat_file;
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126 | struct hfsplus_fork attr_file;
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127 | struct hfsplus_fork start_file;
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128 | } PACKED;
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129 |
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130 | #define HFS_SUPERBLOCK_OFFSET 0x400
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131 | #define HFS_NODE_LEAF 0xff
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132 | #define HFSPLUS_POR_CNID 1
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133 |
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134 | static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
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135 | {
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136 | #define hfs_id_len 8
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137 | md5_ctx_t md5c;
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138 | uint8_t uuid[16];
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139 | unsigned i;
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140 |
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141 | for (i = 0; i < hfs_id_len; i++)
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142 | if (hfs_id[i] != 0)
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143 | goto do_md5;
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144 | return;
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145 | do_md5:
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146 | md5_begin(&md5c);
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147 | md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
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148 | md5_hash(&md5c, hfs_id, hfs_id_len);
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149 | md5_end(&md5c, uuid);
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150 | uuid[6] = 0x30 | (uuid[6] & 0x0f);
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151 | uuid[8] = 0x80 | (uuid[8] & 0x3f);
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152 | volume_id_set_uuid(id, uuid, UUID_DCE);
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153 | }
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154 |
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155 | int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
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156 | {
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157 | uint64_t off = 0;
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158 | unsigned blocksize;
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159 | unsigned cat_block;
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160 | unsigned ext_block_start;
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161 | unsigned ext_block_count;
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162 | int ext;
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163 | unsigned leaf_node_head;
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164 | unsigned leaf_node_count;
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165 | unsigned leaf_node_size;
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166 | unsigned leaf_block;
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167 | uint64_t leaf_off;
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168 | unsigned alloc_block_size;
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169 | unsigned alloc_first_block;
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170 | unsigned embed_first_block;
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171 | unsigned record_count;
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172 | struct hfsplus_vol_header *hfsplus;
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173 | struct hfsplus_bnode_descriptor *descr;
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174 | struct hfsplus_bheader_record *bnode;
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175 | struct hfsplus_catalog_key *key;
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176 | unsigned label_len;
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177 | struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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178 | struct hfs_mdb *hfs;
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179 | const uint8_t *buf;
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180 |
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181 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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182 |
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183 | buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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184 | if (buf == NULL)
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185 | return -1;
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186 |
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187 | hfs = (struct hfs_mdb *) buf;
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188 | if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
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189 | goto checkplus;
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190 |
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191 | /* it may be just a hfs wrapper for hfs+ */
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192 | if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
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193 | alloc_block_size = be32_to_cpu(hfs->al_blk_size);
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194 | dbg("alloc_block_size 0x%x", alloc_block_size);
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195 |
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196 | alloc_first_block = be16_to_cpu(hfs->al_bl_st);
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197 | dbg("alloc_first_block 0x%x", alloc_first_block);
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198 |
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199 | embed_first_block = be16_to_cpu(hfs->embed_startblock);
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200 | dbg("embed_first_block 0x%x", embed_first_block);
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201 |
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202 | off += (alloc_first_block * 512) +
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203 | (embed_first_block * alloc_block_size);
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204 | dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
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205 |
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206 | buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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207 | if (buf == NULL)
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208 | return -1;
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209 | goto checkplus;
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210 | }
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211 |
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212 | if (hfs->label_len > 0 && hfs->label_len < 28) {
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213 | // volume_id_set_label_raw(id, hfs->label, hfs->label_len);
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214 | volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
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215 | }
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216 |
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217 | hfs_set_uuid(id, hfs->finder_info.id);
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218 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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219 | IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
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220 |
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221 | return 0;
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222 |
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223 | checkplus:
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224 | hfsplus = (struct hfsplus_vol_header *) buf;
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225 | if (hfs->signature[0] == 'H')
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226 | if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
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227 | goto hfsplus;
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228 | return -1;
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229 |
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230 | hfsplus:
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231 | hfs_set_uuid(id, hfsplus->finder_info.id);
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232 |
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233 | blocksize = be32_to_cpu(hfsplus->blocksize);
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234 | dbg("blocksize %u", blocksize);
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235 |
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236 | memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
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237 | cat_block = be32_to_cpu(extents[0].start_block);
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238 | dbg("catalog start block 0x%x", cat_block);
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239 |
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240 | buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
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241 | if (buf == NULL)
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242 | goto found;
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243 |
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244 | bnode = (struct hfsplus_bheader_record *)
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245 | &buf[sizeof(struct hfsplus_bnode_descriptor)];
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246 |
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247 | leaf_node_head = be32_to_cpu(bnode->leaf_head);
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248 | dbg("catalog leaf node 0x%x", leaf_node_head);
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249 |
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250 | leaf_node_size = be16_to_cpu(bnode->node_size);
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251 | dbg("leaf node size 0x%x", leaf_node_size);
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252 |
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253 | leaf_node_count = be32_to_cpu(bnode->leaf_count);
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254 | dbg("leaf node count 0x%x", leaf_node_count);
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255 | if (leaf_node_count == 0)
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256 | goto found;
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257 |
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258 | leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
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259 |
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260 | /* get physical location */
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261 | for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
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262 | ext_block_start = be32_to_cpu(extents[ext].start_block);
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263 | ext_block_count = be32_to_cpu(extents[ext].block_count);
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264 | dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
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265 |
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266 | if (ext_block_count == 0)
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267 | goto found;
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268 |
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269 | /* this is our extent */
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270 | if (leaf_block < ext_block_count)
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271 | break;
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272 |
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273 | leaf_block -= ext_block_count;
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274 | }
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275 | if (ext == HFSPLUS_EXTENT_COUNT)
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276 | goto found;
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277 | dbg("found block in extent %i", ext);
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278 |
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279 | leaf_off = (ext_block_start + leaf_block) * blocksize;
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280 |
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281 | buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
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282 | if (buf == NULL)
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283 | goto found;
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284 |
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285 | descr = (struct hfsplus_bnode_descriptor *) buf;
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286 | dbg("descriptor type 0x%x", descr->type);
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287 |
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288 | record_count = be16_to_cpu(descr->num_recs);
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289 | dbg("number of records %u", record_count);
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290 | if (record_count == 0)
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291 | goto found;
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292 |
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293 | if (descr->type != HFS_NODE_LEAF)
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294 | goto found;
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295 |
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296 | key = (struct hfsplus_catalog_key *)
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297 | &buf[sizeof(struct hfsplus_bnode_descriptor)];
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298 |
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299 | dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
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300 | if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
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301 | goto found;
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302 |
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303 | label_len = be16_to_cpu(key->unicode_len) * 2;
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304 | dbg("label unicode16 len %i", label_len);
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305 | // volume_id_set_label_raw(id, key->unicode, label_len);
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306 | volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
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307 |
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308 | found:
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309 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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310 | IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
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311 |
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312 | return 0;
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313 | }
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