[2725] | 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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[3621] | 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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[2725] | 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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[3232] | 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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[2725] | 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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[3232] | 228 | hfs_set_uuid(id, hfs->finder_info.id);
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[2725] | 229 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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[3232] | 230 | IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
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[2725] | 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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[3232] | 242 | hfs_set_uuid(id, hfsplus->finder_info.id);
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[2725] | 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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[3232] | 321 | IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
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[2725] | 322 |
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| 323 | return 0;
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| 324 | }
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