[3320] | 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 | int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
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| 135 | {
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| 136 | uint64_t off = 0;
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| 137 | unsigned blocksize;
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| 138 | unsigned cat_block;
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| 139 | unsigned ext_block_start;
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| 140 | unsigned ext_block_count;
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| 141 | int ext;
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| 142 | unsigned leaf_node_head;
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| 143 | unsigned leaf_node_count;
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| 144 | unsigned leaf_node_size;
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| 145 | unsigned leaf_block;
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| 146 | uint64_t leaf_off;
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| 147 | unsigned alloc_block_size;
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| 148 | unsigned alloc_first_block;
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| 149 | unsigned embed_first_block;
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| 150 | unsigned record_count;
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| 151 | struct hfsplus_vol_header *hfsplus;
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| 152 | struct hfsplus_bnode_descriptor *descr;
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| 153 | struct hfsplus_bheader_record *bnode;
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| 154 | struct hfsplus_catalog_key *key;
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| 155 | unsigned label_len;
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| 156 | struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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| 157 | struct hfs_mdb *hfs;
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| 158 | const uint8_t *buf;
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| 159 |
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| 160 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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| 161 |
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| 162 | buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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| 163 | if (buf == NULL)
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| 164 | return -1;
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| 165 |
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| 166 | hfs = (struct hfs_mdb *) buf;
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| 167 | if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
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| 168 | goto checkplus;
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| 169 |
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| 170 | /* it may be just a hfs wrapper for hfs+ */
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| 171 | if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
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| 172 | alloc_block_size = be32_to_cpu(hfs->al_blk_size);
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| 173 | dbg("alloc_block_size 0x%x", alloc_block_size);
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| 174 |
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| 175 | alloc_first_block = be16_to_cpu(hfs->al_bl_st);
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| 176 | dbg("alloc_first_block 0x%x", alloc_first_block);
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| 177 |
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| 178 | embed_first_block = be16_to_cpu(hfs->embed_startblock);
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| 179 | dbg("embed_first_block 0x%x", embed_first_block);
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| 180 |
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| 181 | off += (alloc_first_block * 512) +
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| 182 | (embed_first_block * alloc_block_size);
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| 183 | dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
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| 184 |
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| 185 | buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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| 186 | if (buf == NULL)
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| 187 | return -1;
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| 188 | goto checkplus;
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| 189 | }
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| 190 |
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| 191 | if (hfs->label_len > 0 && hfs->label_len < 28) {
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| 192 | // volume_id_set_label_raw(id, hfs->label, hfs->label_len);
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| 193 | volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
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| 194 | }
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| 195 |
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| 196 | volume_id_set_uuid(id, hfs->finder_info.id, UUID_HFS);
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| 197 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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| 198 | // id->type = "hfs";
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| 199 |
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| 200 | return 0;
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| 201 |
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| 202 | checkplus:
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| 203 | hfsplus = (struct hfsplus_vol_header *) buf;
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| 204 | if (hfs->signature[0] == 'H')
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| 205 | if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
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| 206 | goto hfsplus;
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| 207 | return -1;
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| 208 |
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| 209 | hfsplus:
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| 210 | volume_id_set_uuid(id, hfsplus->finder_info.id, UUID_HFS);
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| 211 |
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| 212 | blocksize = be32_to_cpu(hfsplus->blocksize);
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| 213 | dbg("blocksize %u", blocksize);
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| 214 |
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| 215 | memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
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| 216 | cat_block = be32_to_cpu(extents[0].start_block);
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| 217 | dbg("catalog start block 0x%x", cat_block);
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| 218 |
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| 219 | buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
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| 220 | if (buf == NULL)
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| 221 | goto found;
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| 222 |
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| 223 | bnode = (struct hfsplus_bheader_record *)
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| 224 | &buf[sizeof(struct hfsplus_bnode_descriptor)];
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| 225 |
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| 226 | leaf_node_head = be32_to_cpu(bnode->leaf_head);
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| 227 | dbg("catalog leaf node 0x%x", leaf_node_head);
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| 228 |
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| 229 | leaf_node_size = be16_to_cpu(bnode->node_size);
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| 230 | dbg("leaf node size 0x%x", leaf_node_size);
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| 231 |
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| 232 | leaf_node_count = be32_to_cpu(bnode->leaf_count);
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| 233 | dbg("leaf node count 0x%x", leaf_node_count);
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| 234 | if (leaf_node_count == 0)
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| 235 | goto found;
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| 236 |
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| 237 | leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
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| 238 |
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| 239 | /* get physical location */
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| 240 | for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
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| 241 | ext_block_start = be32_to_cpu(extents[ext].start_block);
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| 242 | ext_block_count = be32_to_cpu(extents[ext].block_count);
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| 243 | dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
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| 244 |
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| 245 | if (ext_block_count == 0)
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| 246 | goto found;
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| 247 |
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| 248 | /* this is our extent */
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| 249 | if (leaf_block < ext_block_count)
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| 250 | break;
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| 251 |
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| 252 | leaf_block -= ext_block_count;
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| 253 | }
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| 254 | if (ext == HFSPLUS_EXTENT_COUNT)
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| 255 | goto found;
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| 256 | dbg("found block in extent %i", ext);
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| 257 |
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| 258 | leaf_off = (ext_block_start + leaf_block) * blocksize;
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| 259 |
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| 260 | buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
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| 261 | if (buf == NULL)
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| 262 | goto found;
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| 263 |
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| 264 | descr = (struct hfsplus_bnode_descriptor *) buf;
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| 265 | dbg("descriptor type 0x%x", descr->type);
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| 266 |
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| 267 | record_count = be16_to_cpu(descr->num_recs);
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| 268 | dbg("number of records %u", record_count);
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| 269 | if (record_count == 0)
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| 270 | goto found;
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| 271 |
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| 272 | if (descr->type != HFS_NODE_LEAF)
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| 273 | goto found;
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| 274 |
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| 275 | key = (struct hfsplus_catalog_key *)
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| 276 | &buf[sizeof(struct hfsplus_bnode_descriptor)];
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| 277 |
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| 278 | dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
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| 279 | if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
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| 280 | goto found;
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| 281 |
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| 282 | label_len = be16_to_cpu(key->unicode_len) * 2;
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| 283 | dbg("label unicode16 len %i", label_len);
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| 284 | // volume_id_set_label_raw(id, key->unicode, label_len);
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| 285 | volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
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| 286 |
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| 287 | found:
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| 288 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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| 289 | // id->type = "hfsplus";
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| 290 |
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| 291 | return 0;
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| 292 | }
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