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 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_HFS) += hfs.o
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22 |
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23 | //config:
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24 | //config:config FEATURE_VOLUMEID_HFS
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25 | //config: bool "hfs filesystem"
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26 | //config: default y
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27 | //config: depends on VOLUMEID
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28 | //config: help
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29 | //config: TODO
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30 | //config:
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31 |
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32 | #include "volume_id_internal.h"
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33 |
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34 | struct hfs_finder_info{
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35 | uint32_t boot_folder;
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36 | uint32_t start_app;
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37 | uint32_t open_folder;
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38 | uint32_t os9_folder;
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39 | uint32_t reserved;
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40 | uint32_t osx_folder;
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41 | uint8_t id[8];
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42 | } PACKED;
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43 |
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44 | struct hfs_mdb {
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45 | uint8_t signature[2];
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46 | uint32_t cr_date;
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47 | uint32_t ls_Mod;
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48 | uint16_t atrb;
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49 | uint16_t nm_fls;
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50 | uint16_t vbm_st;
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51 | uint16_t alloc_ptr;
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52 | uint16_t nm_al_blks;
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53 | uint32_t al_blk_size;
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54 | uint32_t clp_size;
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55 | uint16_t al_bl_st;
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56 | uint32_t nxt_cnid;
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57 | uint16_t free_bks;
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58 | uint8_t label_len;
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59 | uint8_t label[27];
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60 | uint32_t vol_bkup;
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61 | uint16_t vol_seq_num;
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62 | uint32_t wr_cnt;
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63 | uint32_t xt_clump_size;
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64 | uint32_t ct_clump_size;
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65 | uint16_t num_root_dirs;
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66 | uint32_t file_count;
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67 | uint32_t dir_count;
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68 | struct hfs_finder_info finder_info;
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69 | uint8_t embed_sig[2];
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70 | uint16_t embed_startblock;
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71 | uint16_t embed_blockcount;
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72 | } PACKED;
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73 |
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74 | struct hfsplus_bnode_descriptor {
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75 | uint32_t next;
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76 | uint32_t prev;
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77 | uint8_t type;
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78 | uint8_t height;
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79 | uint16_t num_recs;
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80 | uint16_t reserved;
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81 | } PACKED;
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82 |
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83 | struct hfsplus_bheader_record {
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84 | uint16_t depth;
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85 | uint32_t root;
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86 | uint32_t leaf_count;
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87 | uint32_t leaf_head;
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88 | uint32_t leaf_tail;
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89 | uint16_t node_size;
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90 | } PACKED;
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91 |
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92 | struct hfsplus_catalog_key {
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93 | uint16_t key_len;
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94 | uint32_t parent_id;
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95 | uint16_t unicode_len;
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96 | uint8_t unicode[255 * 2];
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97 | } PACKED;
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98 |
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99 | struct hfsplus_extent {
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100 | uint32_t start_block;
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101 | uint32_t block_count;
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102 | } PACKED;
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103 |
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104 | #define HFSPLUS_EXTENT_COUNT 8
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105 | struct hfsplus_fork {
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106 | uint64_t total_size;
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107 | uint32_t clump_size;
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108 | uint32_t total_blocks;
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109 | struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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110 | } PACKED;
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111 |
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112 | struct hfsplus_vol_header {
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113 | uint8_t signature[2];
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114 | uint16_t version;
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115 | uint32_t attributes;
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116 | uint32_t last_mount_vers;
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117 | uint32_t reserved;
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118 | uint32_t create_date;
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119 | uint32_t modify_date;
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120 | uint32_t backup_date;
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121 | uint32_t checked_date;
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122 | uint32_t file_count;
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123 | uint32_t folder_count;
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124 | uint32_t blocksize;
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125 | uint32_t total_blocks;
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126 | uint32_t free_blocks;
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127 | uint32_t next_alloc;
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128 | uint32_t rsrc_clump_sz;
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129 | uint32_t data_clump_sz;
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130 | uint32_t next_cnid;
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131 | uint32_t write_count;
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132 | uint64_t encodings_bmp;
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133 | struct hfs_finder_info finder_info;
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134 | struct hfsplus_fork alloc_file;
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135 | struct hfsplus_fork ext_file;
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136 | struct hfsplus_fork cat_file;
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137 | struct hfsplus_fork attr_file;
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138 | struct hfsplus_fork start_file;
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139 | } PACKED;
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140 |
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141 | #define HFS_SUPERBLOCK_OFFSET 0x400
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142 | #define HFS_NODE_LEAF 0xff
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143 | #define HFSPLUS_POR_CNID 1
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144 |
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145 | static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
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146 | {
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147 | #define hfs_id_len 8
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148 | md5_ctx_t md5c;
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149 | uint8_t uuid[16];
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150 | unsigned i;
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151 |
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152 | for (i = 0; i < hfs_id_len; i++)
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153 | if (hfs_id[i] != 0)
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154 | goto do_md5;
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155 | return;
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156 | do_md5:
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157 | md5_begin(&md5c);
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158 | md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
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159 | md5_hash(&md5c, hfs_id, hfs_id_len);
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160 | md5_end(&md5c, uuid);
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161 | uuid[6] = 0x30 | (uuid[6] & 0x0f);
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162 | uuid[8] = 0x80 | (uuid[8] & 0x3f);
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163 | volume_id_set_uuid(id, uuid, UUID_DCE);
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164 | }
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165 |
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166 | int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
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167 | {
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168 | uint64_t off = 0;
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169 | unsigned blocksize;
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170 | unsigned cat_block;
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171 | unsigned ext_block_start;
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172 | unsigned ext_block_count;
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173 | int ext;
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174 | unsigned leaf_node_head;
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175 | unsigned leaf_node_count;
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176 | unsigned leaf_node_size;
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177 | unsigned leaf_block;
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178 | uint64_t leaf_off;
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179 | unsigned alloc_block_size;
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180 | unsigned alloc_first_block;
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181 | unsigned embed_first_block;
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182 | unsigned record_count;
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183 | struct hfsplus_vol_header *hfsplus;
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184 | struct hfsplus_bnode_descriptor *descr;
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185 | struct hfsplus_bheader_record *bnode;
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186 | struct hfsplus_catalog_key *key;
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187 | unsigned label_len;
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188 | struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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189 | struct hfs_mdb *hfs;
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190 | const uint8_t *buf;
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191 |
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192 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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193 |
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194 | buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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195 | if (buf == NULL)
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196 | return -1;
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197 |
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198 | hfs = (struct hfs_mdb *) buf;
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199 | if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
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200 | goto checkplus;
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201 |
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202 | /* it may be just a hfs wrapper for hfs+ */
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203 | if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
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204 | alloc_block_size = be32_to_cpu(hfs->al_blk_size);
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205 | dbg("alloc_block_size 0x%x", alloc_block_size);
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206 |
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207 | alloc_first_block = be16_to_cpu(hfs->al_bl_st);
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208 | dbg("alloc_first_block 0x%x", alloc_first_block);
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209 |
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210 | embed_first_block = be16_to_cpu(hfs->embed_startblock);
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211 | dbg("embed_first_block 0x%x", embed_first_block);
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212 |
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213 | off += (alloc_first_block * 512) +
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214 | (embed_first_block * alloc_block_size);
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215 | dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
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216 |
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217 | buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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218 | if (buf == NULL)
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219 | return -1;
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220 | goto checkplus;
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221 | }
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222 |
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223 | if (hfs->label_len > 0 && hfs->label_len < 28) {
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224 | // volume_id_set_label_raw(id, hfs->label, hfs->label_len);
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225 | volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
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226 | }
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227 |
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228 | hfs_set_uuid(id, hfs->finder_info.id);
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229 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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230 | IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
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231 |
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232 | return 0;
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233 |
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234 | checkplus:
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235 | hfsplus = (struct hfsplus_vol_header *) buf;
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236 | if (hfs->signature[0] == 'H')
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237 | if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
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238 | goto hfsplus;
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239 | return -1;
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240 |
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241 | hfsplus:
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242 | hfs_set_uuid(id, hfsplus->finder_info.id);
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243 |
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244 | blocksize = be32_to_cpu(hfsplus->blocksize);
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245 | dbg("blocksize %u", blocksize);
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246 |
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247 | memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
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248 | cat_block = be32_to_cpu(extents[0].start_block);
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249 | dbg("catalog start block 0x%x", cat_block);
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250 |
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251 | buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
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252 | if (buf == NULL)
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253 | goto found;
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254 |
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255 | bnode = (struct hfsplus_bheader_record *)
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256 | &buf[sizeof(struct hfsplus_bnode_descriptor)];
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257 |
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258 | leaf_node_head = be32_to_cpu(bnode->leaf_head);
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259 | dbg("catalog leaf node 0x%x", leaf_node_head);
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260 |
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261 | leaf_node_size = be16_to_cpu(bnode->node_size);
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262 | dbg("leaf node size 0x%x", leaf_node_size);
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263 |
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264 | leaf_node_count = be32_to_cpu(bnode->leaf_count);
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265 | dbg("leaf node count 0x%x", leaf_node_count);
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266 | if (leaf_node_count == 0)
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267 | goto found;
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268 |
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269 | leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
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270 |
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271 | /* get physical location */
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272 | for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
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273 | ext_block_start = be32_to_cpu(extents[ext].start_block);
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274 | ext_block_count = be32_to_cpu(extents[ext].block_count);
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275 | dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
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276 |
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277 | if (ext_block_count == 0)
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278 | goto found;
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279 |
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280 | /* this is our extent */
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281 | if (leaf_block < ext_block_count)
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282 | break;
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283 |
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284 | leaf_block -= ext_block_count;
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285 | }
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286 | if (ext == HFSPLUS_EXTENT_COUNT)
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287 | goto found;
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288 | dbg("found block in extent %i", ext);
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289 |
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290 | leaf_off = (ext_block_start + leaf_block) * blocksize;
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291 |
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292 | buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
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293 | if (buf == NULL)
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294 | goto found;
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295 |
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296 | descr = (struct hfsplus_bnode_descriptor *) buf;
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297 | dbg("descriptor type 0x%x", descr->type);
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298 |
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299 | record_count = be16_to_cpu(descr->num_recs);
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300 | dbg("number of records %u", record_count);
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301 | if (record_count == 0)
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302 | goto found;
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303 |
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304 | if (descr->type != HFS_NODE_LEAF)
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305 | goto found;
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306 |
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307 | key = (struct hfsplus_catalog_key *)
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308 | &buf[sizeof(struct hfsplus_bnode_descriptor)];
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309 |
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310 | dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
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311 | if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
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312 | goto found;
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313 |
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314 | label_len = be16_to_cpu(key->unicode_len) * 2;
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315 | dbg("label unicode16 len %i", label_len);
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316 | // volume_id_set_label_raw(id, key->unicode, label_len);
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317 | volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
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318 |
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319 | found:
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320 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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321 | IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
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322 |
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323 | return 0;
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324 | }
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