libblkid-tiny/hfs.c

   1 /*
   2  * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
   4  *
   5  * This file may be redistributed under the terms of the
   6  * GNU Lesser General Public License.
   7  */
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <string.h>
  12 #include <inttypes.h>
  13
  14 #include "superblocks.h"
  15 //#include "md5.h"
  16
  17 /* HFS / HFS+ */
  18 struct hfs_finder_info {
  19         uint32_t        boot_folder;
  20         uint32_t        start_app;
  21         uint32_t        open_folder;
  22         uint32_t        os9_folder;
  23         uint32_t        reserved;
  24         uint32_t        osx_folder;
  25         uint8_t         id[8];
  26 } __attribute__((packed));
  27
  28 struct hfs_mdb {
  29         uint8_t         signature[2];
  30         uint32_t        cr_date;
  31         uint32_t        ls_Mod;
  32         uint16_t        atrb;
  33         uint16_t        nm_fls;
  34         uint16_t        vbm_st;
  35         uint16_t        alloc_ptr;
  36         uint16_t        nm_al_blks;
  37         uint32_t        al_blk_size;
  38         uint32_t        clp_size;
  39         uint16_t        al_bl_st;
  40         uint32_t        nxt_cnid;
  41         uint16_t        free_bks;
  42         uint8_t         label_len;
  43         uint8_t         label[27];
  44         uint32_t        vol_bkup;
  45         uint16_t        vol_seq_num;
  46         uint32_t        wr_cnt;
  47         uint32_t        xt_clump_size;
  48         uint32_t        ct_clump_size;
  49         uint16_t        num_root_dirs;
  50         uint32_t        file_count;
  51         uint32_t        dir_count;
  52         struct hfs_finder_info finder_info;
  53         uint8_t         embed_sig[2];
  54         uint16_t        embed_startblock;
  55         uint16_t        embed_blockcount;
  56 } __attribute__((packed));
  57
  58
  59 #define HFS_NODE_LEAF                   0xff
  60 #define HFSPLUS_POR_CNID                1
  61
  62 struct hfsplus_bnode_descriptor {
  63         uint32_t                next;
  64         uint32_t                prev;
  65         uint8_t         type;
  66         uint8_t         height;
  67         uint16_t                num_recs;
  68         uint16_t                reserved;
  69 } __attribute__((packed));
  70
  71 struct hfsplus_bheader_record {
  72         uint16_t                depth;
  73         uint32_t                root;
  74         uint32_t                leaf_count;
  75         uint32_t                leaf_head;
  76         uint32_t                leaf_tail;
  77         uint16_t                node_size;
  78 } __attribute__((packed));
  79
  80 struct hfsplus_catalog_key {
  81         uint16_t        key_len;
  82         uint32_t        parent_id;
  83         uint16_t        unicode_len;
  84         uint8_t         unicode[255 * 2];
  85 } __attribute__((packed));
  86
  87 struct hfsplus_extent {
  88         uint32_t                start_block;
  89         uint32_t                block_count;
  90 } __attribute__((packed));
  91
  92 #define HFSPLUS_EXTENT_COUNT            8
  93 struct hfsplus_fork {
  94         uint64_t                total_size;
  95         uint32_t                clump_size;
  96         uint32_t                total_blocks;
  97         struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
  98 } __attribute__((packed));
  99
 100 struct hfsplus_vol_header {
 101         uint8_t         signature[2];
 102         uint16_t                version;
 103         uint32_t                attributes;
 104         uint32_t                last_mount_vers;
 105         uint32_t                reserved;
 106         uint32_t                create_date;
 107         uint32_t                modify_date;
 108         uint32_t                backup_date;
 109         uint32_t                checked_date;
 110         uint32_t                file_count;
 111         uint32_t                folder_count;
 112         uint32_t                blocksize;
 113         uint32_t                total_blocks;
 114         uint32_t                free_blocks;
 115         uint32_t                next_alloc;
 116         uint32_t                rsrc_clump_sz;
 117         uint32_t                data_clump_sz;
 118         uint32_t                next_cnid;
 119         uint32_t                write_count;
 120         uint64_t                encodings_bmp;
 121         struct hfs_finder_info finder_info;
 122         struct hfsplus_fork alloc_file;
 123         struct hfsplus_fork ext_file;
 124         struct hfsplus_fork cat_file;
 125         struct hfsplus_fork attr_file;
 126         struct hfsplus_fork start_file;
 127 }  __attribute__((packed));
 128
 129 #define HFSPLUS_SECTOR_SIZE        512
 130
 131 static int hfs_set_uuid(blkid_probe pr, unsigned char const *hfs_info, size_t len)
 132 {
 133 /*      static unsigned char const hash_init[MD5LENGTH] = {
 134                 0xb3, 0xe2, 0x0f, 0x39, 0xf2, 0x92, 0x11, 0xd6,
 135                 0x97, 0xa4, 0x00, 0x30, 0x65, 0x43, 0xec, 0xac
 136         };
 137         unsigned char uuid[MD5LENGTH];
 138         struct MD5Context md5c;
 139
 140         if (memcmp(hfs_info, "\0\0\0\0\0\0\0\0", len) == 0)
 141                 return -1;
 142         MD5Init(&md5c);
 143         MD5Update(&md5c, hash_init, MD5LENGTH);
 144         MD5Update(&md5c, hfs_info, len);
 145         MD5Final(uuid, &md5c);
 146         uuid[6] = 0x30 | (uuid[6] & 0x0f);
 147         uuid[8] = 0x80 | (uuid[8] & 0x3f);
 148         return blkid_probe_set_uuid(pr, uuid);*/
 149         return -1;
 150 }
 151
 152 static int probe_hfs(blkid_probe pr, const struct blkid_idmag *mag)
 153 {
 154         struct hfs_mdb  *hfs;
 155
 156         hfs = blkid_probe_get_sb(pr, mag, struct hfs_mdb);
 157         if (!hfs)
 158                 return -1;
 159
 160         if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
 161             (memcmp(hfs->embed_sig, "HX", 2) == 0))
 162                 return 1;       /* Not hfs, but an embedded HFS+ */
 163
 164         hfs_set_uuid(pr, hfs->finder_info.id, sizeof(hfs->finder_info.id));
 165
 166         blkid_probe_set_label(pr, hfs->label, hfs->label_len);
 167         return 0;
 168 }
 169
 170 static int probe_hfsplus(blkid_probe pr, const struct blkid_idmag *mag)
 171 {
 172         struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
 173         struct hfsplus_bnode_descriptor *descr;
 174         struct hfsplus_bheader_record *bnode;
 175         struct hfsplus_catalog_key *key;
 176         struct hfsplus_vol_header *hfsplus;
 177         struct hfs_mdb *sbd;
 178         unsigned int alloc_block_size;
 179         unsigned int alloc_first_block;
 180         unsigned int embed_first_block;
 181         unsigned int off = 0;
 182         unsigned int blocksize;
 183         unsigned int cat_block;
 184         unsigned int ext_block_start;
 185         unsigned int ext_block_count;
 186         unsigned int record_count;
 187         unsigned int leaf_node_head;
 188         unsigned int leaf_node_count;
 189         unsigned int leaf_node_size;
 190         unsigned int leaf_block;
 191         int ext;
 192         uint64_t leaf_off;
 193         unsigned char *buf;
 194
 195         sbd = blkid_probe_get_sb(pr, mag, struct hfs_mdb);
 196         if (!sbd)
 197                 return -1;
 198
 199         /* Check for a HFS+ volume embedded in a HFS volume */
 200         if (memcmp(sbd->signature, "BD", 2) == 0) {
 201                 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
 202                     (memcmp(sbd->embed_sig, "HX", 2) != 0))
 203                         /* This must be an HFS volume, so fail */
 204                         return 1;
 205
 206                 alloc_block_size = be32_to_cpu(sbd->al_blk_size);
 207                 alloc_first_block = be16_to_cpu(sbd->al_bl_st);
 208                 embed_first_block = be16_to_cpu(sbd->embed_startblock);
 209                 off = (alloc_first_block * 512) +
 210                         (embed_first_block * alloc_block_size);
 211
 212                 buf = blkid_probe_get_buffer(pr,
 213                                 off + (mag->kboff * 1024),
 214                                 sizeof(struct hfsplus_vol_header));
 215                 hfsplus = (struct hfsplus_vol_header *) buf;
 216
 217         } else
 218                 hfsplus = blkid_probe_get_sb(pr, mag,
 219                                 struct hfsplus_vol_header);
 220
 221         if (!hfsplus)
 222                 return -1;
 223
 224         if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
 225             (memcmp(hfsplus->signature, "HX", 2) != 0))
 226                 return 1;
 227
 228         hfs_set_uuid(pr, hfsplus->finder_info.id, sizeof(hfsplus->finder_info.id));
 229
 230         blocksize = be32_to_cpu(hfsplus->blocksize);
 231         if (blocksize < HFSPLUS_SECTOR_SIZE)
 232                 return -1;
 233
 234         memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
 235         cat_block = be32_to_cpu(extents[0].start_block);
 236
 237         buf = blkid_probe_get_buffer(pr,
 238                         off + ((blkid_loff_t) cat_block * blocksize), 0x2000);
 239         if (!buf)
 240                 return 0;
 241
 242         bnode = (struct hfsplus_bheader_record *)
 243                 &buf[sizeof(struct hfsplus_bnode_descriptor)];
 244
 245         leaf_node_head = be32_to_cpu(bnode->leaf_head);
 246         leaf_node_size = be16_to_cpu(bnode->node_size);
 247         leaf_node_count = be32_to_cpu(bnode->leaf_count);
 248         if (leaf_node_count == 0)
 249                 return 0;
 250
 251         leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
 252
 253         /* get physical location */
 254         for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
 255                 ext_block_start = be32_to_cpu(extents[ext].start_block);
 256                 ext_block_count = be32_to_cpu(extents[ext].block_count);
 257                 if (ext_block_count == 0)
 258                         return 0;
 259
 260                 /* this is our extent */
 261                 if (leaf_block < ext_block_count)
 262                         break;
 263
 264                 leaf_block -= ext_block_count;
 265         }
 266         if (ext == HFSPLUS_EXTENT_COUNT)
 267                 return 0;
 268
 269         leaf_off = (ext_block_start + leaf_block) * blocksize;
 270
 271         buf = blkid_probe_get_buffer(pr,
 272                                 (blkid_loff_t) off + leaf_off,
 273                                 leaf_node_size);
 274         if (!buf)
 275                 return 0;
 276
 277         descr = (struct hfsplus_bnode_descriptor *) buf;
 278         record_count = be16_to_cpu(descr->num_recs);
 279         if (record_count == 0)
 280                 return 0;
 281
 282         if (descr->type != HFS_NODE_LEAF)
 283                 return 0;
 284
 285         key = (struct hfsplus_catalog_key *)
 286                 &buf[sizeof(struct hfsplus_bnode_descriptor)];
 287
 288         if (be32_to_cpu(key->parent_id) != HFSPLUS_POR_CNID)
 289                 return 0;
 290
 291         return 0;
 292 }
 293
 294 const struct blkid_idinfo hfs_idinfo =
 295 {
 296         .name           = "hfs",
 297         .usage          = BLKID_USAGE_FILESYSTEM,
 298         .probefunc      = probe_hfs,
 299         .flags          = BLKID_IDINFO_TOLERANT,
 300         .magics         =
 301         {
 302                 { .magic = "BD", .len = 2, .kboff = 1 },
 303                 { NULL }
 304         }
 305 };
 306
 307 const struct blkid_idinfo hfsplus_idinfo =
 308 {
 309         .name           = "hfsplus",
 310         .usage          = BLKID_USAGE_FILESYSTEM,
 311         .probefunc      = probe_hfsplus,
 312         .magics         =
 313         {
 314                 { .magic = "BD", .len = 2, .kboff = 1 },
 315                 { .magic = "H+", .len = 2, .kboff = 1 },
 316                 { .magic = "HX", .len = 2, .kboff = 1 },
 317                 { NULL }
 318         }
 319 };