/* * volume_id - reads filesystem label and uuid * * Copyright (C) 2004 Kay Sievers * * The superblock structs are taken from the linux kernel sources * and the libblkid living inside the e2fsprogs. This is a simple * straightforward implementation for reading the label strings of the * most common filesystems. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #ifdef HAVE_CONFIG_H # include #endif #include #include #include #include #include #include #include #include #include #include "volume_id.h" #ifdef DEBUG #define dbg(format, arg...) \ do { \ printf("%s: " format "\n", __FUNCTION__ , ## arg); \ } while (0) #else #define dbg(format, arg...) do {} while (0) #endif /* DEBUG */ #define bswap16(x) (__u16)((((__u16)(x) & 0x00ffu) << 8) | \ (((__u32)(x) & 0xff00u) >> 8)) #define bswap32(x) (__u32)((((__u32)(x) & 0xff000000u) >> 24) | \ (((__u32)(x) & 0x00ff0000u) >> 8) | \ (((__u32)(x) & 0x0000ff00u) << 8) | \ (((__u32)(x) & 0x000000ffu) << 24)) #define bswap64(x) (__u64)((((__u64)(x) & 0xff00000000000000u) >> 56) | \ (((__u64)(x) & 0x00ff000000000000u) >> 40) | \ (((__u64)(x) & 0x0000ff0000000000u) >> 24) | \ (((__u64)(x) & 0x000000ff00000000u) >> 8) | \ (((__u64)(x) & 0x00000000ff000000u) << 8) | \ (((__u64)(x) & 0x0000000000ff0000u) << 24) | \ (((__u64)(x) & 0x000000000000ff00u) << 40) | \ (((__u64)(x) & 0x00000000000000ffu) << 56)) #if (__BYTE_ORDER == __LITTLE_ENDIAN) #define le16_to_cpu(x) (x) #define le32_to_cpu(x) (x) #define le64_to_cpu(x) (x) #define be16_to_cpu(x) bswap16(x) #define be32_to_cpu(x) bswap32(x) #elif (__BYTE_ORDER == __BIG_ENDIAN) #define le16_to_cpu(x) bswap16(x) #define le32_to_cpu(x) bswap32(x) #define le64_to_cpu(x) bswap64(x) #define be16_to_cpu(x) (x) #define be32_to_cpu(x) (x) #endif /* size of superblock buffer, reiserfs block is at 64k */ #define SB_BUFFER_SIZE 0x11000 /* size of seek buffer 4k */ #define SEEK_BUFFER_SIZE 0x1000 static void set_label_raw(struct volume_id *id, const __u8 *buf, unsigned int count) { memcpy(id->label_raw, buf, count); id->label_raw_len = count; } static void set_label_string(struct volume_id *id, const __u8 *buf, unsigned int count) { unsigned int i; memcpy(id->label, buf, count); /* remove trailing whitespace */ i = strnlen(id->label, count); while (i--) { if (! isspace(id->label[i])) break; } id->label[i+1] = '\0'; } #define LE 0 #define BE 1 static void set_label_unicode16(struct volume_id *id, const __u8 *buf, unsigned int endianess, unsigned int count) { unsigned int i, j; __u16 c; j = 0; for (i = 0; i + 2 <= count; i += 2) { if (endianess == LE) c = (buf[i+1] << 8) | buf[i]; else c = (buf[i] << 8) | buf[i+1]; if (c == 0) { id->label[j] = '\0'; break; } else if (c < 0x80) { id->label[j++] = (__u8) c; } else if (c < 0x800) { id->label[j++] = (__u8) (0xc0 | (c >> 6)); id->label[j++] = (__u8) (0x80 | (c & 0x3f)); } else { id->label[j++] = (__u8) (0xe0 | (c >> 12)); id->label[j++] = (__u8) (0x80 | ((c >> 6) & 0x3f)); id->label[j++] = (__u8) (0x80 | (c & 0x3f)); } } } static void set_uuid(struct volume_id *id, const __u8 *buf, unsigned int count) { unsigned int i; memcpy(id->uuid_raw, buf, count); /* create string if uuid is set */ for (i = 0; i < count; i++) if (buf[i] != 0) goto set; return; set: switch(count) { case 4: sprintf(id->uuid, "%02X%02X-%02X%02X", buf[3], buf[2], buf[1], buf[0]); break; case 8: sprintf(id->uuid,"%02X%02X-%02X%02X-%02X%02X-%02X%02X", buf[7], buf[6], buf[5], buf[4], buf[3], buf[2], buf[1], buf[0]); break; case 16: sprintf(id->uuid, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" "%02x%02x%02x%02x%02x%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14],buf[15]); break; } } static __u8 *get_buffer(struct volume_id *id, __u64 off, unsigned int len) { unsigned int buf_len; dbg("get buffer off 0x%llx, len 0x%x", off, len); /* check if requested area fits in superblock buffer */ if (off + len <= SB_BUFFER_SIZE) { if (id->sbbuf == NULL) { id->sbbuf = malloc(SB_BUFFER_SIZE); if (id->sbbuf == NULL) return NULL; } /* check if we need to read */ if ((off + len) > id->sbbuf_len) { dbg("read sbbuf len:0x%llx", off + len); lseek(id->fd, 0, SEEK_SET); buf_len = read(id->fd, id->sbbuf, off + len); dbg("got 0x%x (%i) bytes", buf_len, buf_len); id->sbbuf_len = buf_len; if (buf_len < off + len) return NULL; } return &(id->sbbuf[off]); } else { if (len > SEEK_BUFFER_SIZE) len = SEEK_BUFFER_SIZE; /* get seek buffer */ if (id->seekbuf == NULL) { id->seekbuf = malloc(SEEK_BUFFER_SIZE); if (id->seekbuf == NULL) return NULL; } /* check if we need to read */ if ((off < id->seekbuf_off) || ((off + len) > (id->seekbuf_off + id->seekbuf_len))) { dbg("read seekbuf off:0x%llx len:0x%x", off, len); if (lseek(id->fd, off, SEEK_SET) == -1) return NULL; buf_len = read(id->fd, id->seekbuf, len); dbg("got 0x%x (%i) bytes", buf_len, buf_len); id->seekbuf_off = off; id->seekbuf_len = buf_len; if (buf_len < len) return NULL; } return &(id->seekbuf[off - id->seekbuf_off]); } } static void free_buffer(struct volume_id *id) { if (id->sbbuf != NULL) { free(id->sbbuf); id->sbbuf = NULL; id->sbbuf_len = 0; } if (id->seekbuf != NULL) { free(id->seekbuf); id->seekbuf = NULL; id->seekbuf_len = 0; } } #define LVM1_SB_OFF 0x400 #define LVM1_MAGIC "HM" static int probe_lvm1(struct volume_id *id, __u64 off) { struct lvm2_super_block { __u8 id[2]; } __attribute__((packed)) *lvm; const __u8 *buf; buf = get_buffer(id, off + LVM1_SB_OFF, 0x800); if (buf == NULL) return -1; lvm = (struct lvm2_super_block *) buf; if (strncmp(lvm->id, LVM1_MAGIC, 2) != 0) return -1; id->usage_id = VOLUME_ID_RAID; id->type_id = VOLUME_ID_LVM1; id->type = "LVM1_member"; return 0; } #define LVM2_LABEL_ID "LABELONE" #define LVM2LABEL_SCAN_SECTORS 4 static int probe_lvm2(struct volume_id *id, __u64 off) { struct lvm2_super_block { __u8 id[8]; __u64 sector_xl; __u32 crc_xl; __u32 offset_xl; __u8 type[8]; } __attribute__((packed)) *lvm; const __u8 *buf; unsigned int soff; buf = get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200); if (buf == NULL) return -1; for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) { lvm = (struct lvm2_super_block *) &buf[soff]; if (strncmp(lvm->id, LVM2_LABEL_ID, 8) == 0) goto found; } return -1; found: strncpy(id->type_version, lvm->type, 8); id->usage_id = VOLUME_ID_RAID; id->type_id = VOLUME_ID_LVM1; id->type = "LVM2_member"; return 0; } #define MD_RESERVED_BYTES 0x10000 #define MD_MAGIC 0xa92b4efc static int probe_linux_raid(struct volume_id *id, __u64 off, __u64 size) { struct mdp_super_block { __u32 md_magic; __u32 major_version; __u32 minor_version; __u32 patch_version; __u32 gvalid_words; __u32 set_uuid0; __u32 ctime; __u32 level; __u32 size; __u32 nr_disks; __u32 raid_disks; __u32 md_minor; __u32 not_persistent; __u32 set_uuid1; __u32 set_uuid2; __u32 set_uuid3; } __attribute__((packed)) *mdp; const __u8 *buf; __u64 sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES; __u8 uuid[16]; if (size < 0x10000) return -1; buf = get_buffer(id, off + sboff, 0x800); if (buf == NULL) return -1; mdp = (struct mdp_super_block *) buf; if (le32_to_cpu(mdp->md_magic) != MD_MAGIC) return -1; memcpy(uuid, &mdp->set_uuid0, 4); memcpy(&uuid[4], &mdp->set_uuid1, 12); set_uuid(id, uuid, 16); snprintf(id->type_version, VOLUME_ID_FORMAT_SIZE-1, "%u.%u.%u", le32_to_cpu(mdp->major_version), le32_to_cpu(mdp->minor_version), le32_to_cpu(mdp->patch_version)); dbg("found raid signature"); id->usage_id = VOLUME_ID_RAID; id->type = "linux_raid_member"; return 0; } #define MSDOS_MAGIC "\x55\xaa" #define MSDOS_PARTTABLE_OFFSET 0x1be #define MSDOS_SIG_OFF 0x1fe #define BSIZE 0x200 #define DOS_EXTENDED_PARTITION 0x05 #define LINUX_EXTENDED_PARTITION 0x85 #define WIN98_EXTENDED_PARTITION 0x0f #define LINUX_RAID_PARTITION 0xfd #define is_extended(type) \ (type == DOS_EXTENDED_PARTITION || \ type == WIN98_EXTENDED_PARTITION || \ type == LINUX_EXTENDED_PARTITION) #define is_raid(type) \ (type == LINUX_RAID_PARTITION) static int probe_msdos_part_table(struct volume_id *id, __u64 off) { struct msdos_partition_entry { __u8 boot_ind; __u8 head; __u8 sector; __u8 cyl; __u8 sys_ind; __u8 end_head; __u8 end_sector; __u8 end_cyl; __u32 start_sect; __u32 nr_sects; } __attribute__((packed)) *part; const __u8 *buf; int i; __u64 poff; __u64 plen; __u64 extended = 0; __u64 current; __u64 next; int limit; int empty = 1; struct volume_id_partition *p; buf = get_buffer(id, off, 0x200); if (buf == NULL) return -1; if (strncmp(&buf[MSDOS_SIG_OFF], MSDOS_MAGIC, 2) != 0) return -1; /* check flags on all entries for a valid partition table */ part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET]; for (i = 0; i < 4; i++) { if (part[i].boot_ind != 0 && part[i].boot_ind != 0x80) return -1; if (le32_to_cpu(part[i].nr_sects) != 0) empty = 0; } if (empty == 1) return -1; if (id->partitions != NULL) free(id->partitions); id->partitions = malloc(VOLUME_ID_PARTITIONS_MAX * sizeof(struct volume_id_partition)); if (id->partitions == NULL) return -1; memset(id->partitions, 0x00, VOLUME_ID_PARTITIONS_MAX * sizeof(struct volume_id_partition)); for (i = 0; i < 4; i++) { poff = (__u64) le32_to_cpu(part[i].start_sect) * BSIZE; plen = (__u64) le32_to_cpu(part[i].nr_sects) * BSIZE; if (plen == 0) continue; p = &id->partitions[i]; if (is_extended(part[i].sys_ind)) { dbg("found extended partition at 0x%llx", poff); p->usage_id = VOLUME_ID_PARTITIONTABLE; p->type_id = VOLUME_ID_MSDOSEXTENDED; p->type = "msdos_extended_partition"; if (extended == 0) extended = off + poff; } else { dbg("found 0x%x data partition at 0x%llx, len 0x%llx", part[i].sys_ind, poff, plen); if (is_raid(part[i].sys_ind)) p->usage_id = VOLUME_ID_RAID; else p->usage_id = VOLUME_ID_UNPROBED; } p->off = off + poff; p->len = plen; id->partition_count = i+1; } next = extended; current = extended; limit = 50; /* follow extended partition chain and add data partitions */ while (next != 0) { if (limit-- == 0) { dbg("extended chain limit reached"); break; } buf = get_buffer(id, current, 0x200); if (buf == NULL) break; part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET]; if (strncmp(&buf[MSDOS_SIG_OFF], MSDOS_MAGIC, 2) != 0) break; next = 0; for (i = 0; i < 4; i++) { poff = (__u64) le32_to_cpu(part[i].start_sect) * BSIZE; plen = (__u64) le32_to_cpu(part[i].nr_sects) * BSIZE; if (plen == 0) continue; if (is_extended(part[i].sys_ind)) { dbg("found extended partition at 0x%llx", poff); if (next == 0) next = extended + poff; } else { dbg("found 0x%x data partition at 0x%llx, len 0x%llx", part[i].sys_ind, poff, plen); /* we always start at the 5th entry */ while (id->partition_count < 4) id->partitions[id->partition_count++].usage_id = VOLUME_ID_UNUSED; p = &id->partitions[id->partition_count]; if (is_raid(part[i].sys_ind)) p->usage_id = VOLUME_ID_RAID; else p->usage_id = VOLUME_ID_UNPROBED; p->off = current + poff; p->len = plen; id->partition_count++; if (id->partition_count >= VOLUME_ID_PARTITIONS_MAX) { dbg("to many partitions"); next = 0; } } } current = next; } id->usage_id = VOLUME_ID_PARTITIONTABLE; id->type_id = VOLUME_ID_MSDOSPARTTABLE; id->type = "msdos_partition_table"; return 0; } #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008 #define EXT_SUPERBLOCK_OFFSET 0x400 static int probe_ext(struct volume_id *id, __u64 off) { struct ext2_super_block { __u32 inodes_count; __u32 blocks_count; __u32 r_blocks_count; __u32 free_blocks_count; __u32 free_inodes_count; __u32 first_data_block; __u32 log_block_size; __u32 dummy3[7]; __u8 magic[2]; __u16 state; __u32 dummy5[8]; __u32 feature_compat; __u32 feature_incompat; __u32 feature_ro_compat; __u8 uuid[16]; __u8 volume_name[16]; } __attribute__((__packed__)) *es; es = (struct ext2_super_block *) get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200); if (es == NULL) return -1; if (es->magic[0] != 0123 || es->magic[1] != 0357) return -1; set_label_raw(id, es->volume_name, 16); set_label_string(id, es->volume_name, 16); set_uuid(id, es->uuid, 16); if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) { id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_EXT3; id->type = "ext3"; } else { id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_EXT2; id->type = "ext2"; } return 0; } #define REISERFS1_SUPERBLOCK_OFFSET 0x2000 #define REISERFS_SUPERBLOCK_OFFSET 0x10000 static int probe_reiserfs(struct volume_id *id, __u64 off) { struct reiserfs_super_block { __u32 blocks_count; __u32 free_blocks; __u32 root_block; __u32 journal_block; __u32 journal_dev; __u32 orig_journal_size; __u32 dummy2[5]; __u16 blocksize; __u16 dummy3[3]; __u8 magic[12]; __u32 dummy4[5]; __u8 uuid[16]; __u8 label[16]; } __attribute__((__packed__)) *rs; rs = (struct reiserfs_super_block *) get_buffer(id, off + REISERFS_SUPERBLOCK_OFFSET, 0x200); if (rs == NULL) return -1; if (strncmp(rs->magic, "ReIsEr2Fs", 9) == 0) { strcpy(id->type_version, "3.6"); goto found; } if (strncmp(rs->magic, "ReIsEr3Fs", 9) == 0) { strcpy(id->type_version, "JR"); goto found; } rs = (struct reiserfs_super_block *) get_buffer(id, off + REISERFS1_SUPERBLOCK_OFFSET, 0x200); if (rs == NULL) return -1; if (strncmp(rs->magic, "ReIsErFs", 8) == 0) { strcpy(id->type_version, "3.5"); goto found; } return -1; found: set_label_raw(id, rs->label, 16); set_label_string(id, rs->label, 16); set_uuid(id, rs->uuid, 16); id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_REISERFS; id->type = "reiserfs"; return 0; } static int probe_xfs(struct volume_id *id, __u64 off) { struct xfs_super_block { __u8 magic[4]; __u32 blocksize; __u64 dblocks; __u64 rblocks; __u32 dummy1[2]; __u8 uuid[16]; __u32 dummy2[15]; __u8 fname[12]; __u32 dummy3[2]; __u64 icount; __u64 ifree; __u64 fdblocks; } __attribute__((__packed__)) *xs; xs = (struct xfs_super_block *) get_buffer(id, off, 0x200); if (xs == NULL) return -1; if (strncmp(xs->magic, "XFSB", 4) != 0) return -1; set_label_raw(id, xs->fname, 12); set_label_string(id, xs->fname, 12); set_uuid(id, xs->uuid, 16); id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_XFS; id->type = "xfs"; return 0; } #define JFS_SUPERBLOCK_OFFSET 0x8000 static int probe_jfs(struct volume_id *id, __u64 off) { struct jfs_super_block { __u8 magic[4]; __u32 version; __u64 size; __u32 bsize; __u32 dummy1; __u32 pbsize; __u32 dummy2[27]; __u8 uuid[16]; __u8 label[16]; __u8 loguuid[16]; } __attribute__((__packed__)) *js; js = (struct jfs_super_block *) get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200); if (js == NULL) return -1; if (strncmp(js->magic, "JFS1", 4) != 0) return -1; set_label_raw(id, js->label, 16); set_label_string(id, js->label, 16); set_uuid(id, js->uuid, 16); id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_JFS; id->type = "jfs"; return 0; } #define FAT12_MAX 0xff5 #define FAT16_MAX 0xfff5 #define FAT_ATTR_VOLUME 0x08 struct vfat_dir_entry { __u8 name[11]; __u8 attr; __u16 time_creat; __u16 date_creat; __u16 time_acc; __u16 date_acc; __u16 cluster_high; __u16 time_write; __u16 date_write; __u16 cluster_low; __u32 size; } __attribute__((__packed__)); static char *vfat_search_label_in_dir(const __u8 *buf, __u16 size) { struct vfat_dir_entry *dir; int i; __u16 count; dir = (struct vfat_dir_entry*) buf; count = size / sizeof(struct vfat_dir_entry); dbg("expected entries 0x%x", count); for (i = 0; i <= count; i++) { /* end marker */ if (dir[i].attr == 0x00) { dbg("end of dir"); return NULL; } /* empty entry */ if (dir[i].attr == 0xe5) continue; if (dir[i].attr == FAT_ATTR_VOLUME) { dbg("found ATTR_VOLUME id in root dir"); return dir[i].name; } dbg("skip dir entry"); } return NULL; } static int probe_vfat(struct volume_id *id, __u64 off) { struct vfat_super_block { __u8 boot_jump[3]; __u8 sysid[8]; __u16 sector_size; __u8 sectors_per_cluster; __u16 reserved; __u8 fats; __u16 dir_entries; __u16 sectors; __u8 media; __u16 fat_length; __u16 secs_track; __u16 heads; __u32 hidden; __u32 total_sect; union { struct fat_super_block { __u8 unknown[3]; __u8 serno[4]; __u8 label[11]; __u8 magic[8]; __u8 dummy2[192]; __u8 pmagic[2]; } __attribute__((__packed__)) fat; struct fat32_super_block { __u32 fat32_length; __u16 flags; __u8 version[2]; __u32 root_cluster; __u16 insfo_sector; __u16 backup_boot; __u16 reserved2[6]; __u8 unknown[3]; __u8 serno[4]; __u8 label[11]; __u8 magic[8]; __u8 dummy2[164]; __u8 pmagic[2]; } __attribute__((__packed__)) fat32; } __attribute__((__packed__)) type; } __attribute__((__packed__)) *vs; __u16 sector_size; __u16 dir_entries; __u32 sect_count; __u16 reserved; __u16 fat_size; __u32 root_cluster; __u32 dir_size; __u32 cluster_count; __u32 fat_length; __u64 root_start; __u32 start_data_sect; __u16 root_dir_entries; __u8 *buf; __u32 buf_size; __u8 *label = NULL; __u32 next; vs = (struct vfat_super_block *) get_buffer(id, off, 0x200); if (vs == NULL) return -1; /* believe only that's fat, don't trust the version * the cluster_count will tell us */ if (strncmp(vs->type.fat32.magic, "MSWIN", 5) == 0) goto valid; if (strncmp(vs->type.fat32.magic, "FAT32 ", 8) == 0) goto valid; if (strncmp(vs->type.fat.magic, "FAT16 ", 8) == 0) goto valid; if (strncmp(vs->type.fat.magic, "MSDOS", 5) == 0) goto valid; if (strncmp(vs->type.fat.magic, "FAT12 ", 8) == 0) goto valid; /* * There are old floppies out there without a magic, so we check * for well known values and guess if it's a fat volume */ /* boot jump address check */ if ((vs->boot_jump[0] != 0xeb || vs->boot_jump[2] != 0x90) && vs->boot_jump[0] != 0xe9) return -1; /* heads check */ if (vs->heads == 0) return -1; /* cluster size check*/ if (vs->sectors_per_cluster == 0 || (vs->sectors_per_cluster & (vs->sectors_per_cluster-1))) return -1; /* media check */ if (vs->media < 0xf8 && vs->media != 0xf0) return -1; /* fat count*/ if (vs->fats != 2) return -1; valid: /* sector size check */ sector_size = le16_to_cpu(vs->sector_size); if (sector_size != 0x200 && sector_size != 0x400 && sector_size != 0x800 && sector_size != 0x1000) return -1; dbg("sector_size 0x%x", sector_size); dbg("sectors_per_cluster 0x%x", vs->sectors_per_cluster); dir_entries = le16_to_cpu(vs->dir_entries); reserved = le16_to_cpu(vs->reserved); dbg("reserved 0x%x", reserved); sect_count = le16_to_cpu(vs->sectors); if (sect_count == 0) sect_count = vs->total_sect; dbg("sect_count 0x%x", sect_count); fat_length = le16_to_cpu(vs->fat_length); if (fat_length == 0) fat_length = le32_to_cpu(vs->type.fat32.fat32_length); dbg("fat_length 0x%x", fat_length); fat_size = fat_length * vs->fats; dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + (sector_size-1)) / sector_size; dbg("dir_size 0x%x", dir_size); cluster_count = sect_count - (reserved + fat_size + dir_size); cluster_count /= vs->sectors_per_cluster; dbg("cluster_count 0x%x", cluster_count); if (cluster_count < FAT12_MAX) { strcpy(id->type_version, "FAT12"); } else if (cluster_count < FAT16_MAX) { strcpy(id->type_version, "FAT16"); } else { strcpy(id->type_version, "FAT32"); goto fat32; } /* the label may be an attribute in the root directory */ root_start = (reserved + fat_size) * sector_size; root_dir_entries = le16_to_cpu(vs->dir_entries); dbg("root dir start 0x%x", root_start); buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); buf = get_buffer(id, off + root_start, buf_size); if (buf == NULL) goto found; label = vfat_search_label_in_dir(buf, buf_size); if (label != NULL && strncmp(label, "NO NAME ", 11) != 0) { set_label_raw(id, label, 11); set_label_string(id, label, 11); } else if (strncmp(vs->type.fat.label, "NO NAME ", 11) != 0) { set_label_raw(id, vs->type.fat.label, 11); set_label_string(id, vs->type.fat.label, 11); } set_uuid(id, vs->type.fat.serno, 4); goto found; fat32: /* FAT32 root dir is a cluster chain like any other directory */ buf_size = vs->sectors_per_cluster * sector_size; root_cluster = le32_to_cpu(vs->type.fat32.root_cluster); dbg("root dir cluster %u", root_cluster); start_data_sect = reserved + fat_size; next = root_cluster; while (1) { __u32 next_sect_off; __u64 next_off; __u64 fat_entry_off; dbg("next cluster %u", next); next_sect_off = (next - 2) * vs->sectors_per_cluster; next_off = (start_data_sect + next_sect_off) * sector_size; dbg("cluster offset 0x%x", next_off); /* get cluster */ buf = get_buffer(id, off + next_off, buf_size); if (buf == NULL) goto found; label = vfat_search_label_in_dir(buf, buf_size); if (label != NULL) break; /* get FAT entry */ fat_entry_off = (reserved * sector_size) + (next * sizeof(__u32)); buf = get_buffer(id, off + fat_entry_off, buf_size); if (buf == NULL) goto found; /* set next cluster */ next = le32_to_cpu(*((__u32 *) buf) & 0x0fffffff); if (next == 0) break; } if (label != NULL && strncmp(label, "NO NAME ", 11) != 0) { set_label_raw(id, label, 11); set_label_string(id, label, 11); } else if (strncmp(vs->type.fat32.label, "NO NAME ", 11) == 0) { set_label_raw(id, vs->type.fat32.label, 11); set_label_string(id, vs->type.fat32.label, 11); } set_uuid(id, vs->type.fat32.serno, 4); found: id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_VFAT; id->type = "vfat"; return 0; } #define UDF_VSD_OFFSET 0x8000 static int probe_udf(struct volume_id *id, __u64 off) { struct volume_descriptor { struct descriptor_tag { __u16 id; __u16 version; __u8 checksum; __u8 reserved; __u16 serial; __u16 crc; __u16 crc_len; __u32 location; } __attribute__((__packed__)) tag; union { struct anchor_descriptor { __u32 length; __u32 location; } __attribute__((__packed__)) anchor; struct primary_descriptor { __u32 seq_num; __u32 desc_num; struct dstring { __u8 clen; __u8 c[31]; } __attribute__((__packed__)) ident; } __attribute__((__packed__)) primary; } __attribute__((__packed__)) type; } __attribute__((__packed__)) *vd; struct volume_structure_descriptor { __u8 type; __u8 id[5]; __u8 version; } *vsd; unsigned int bs; unsigned int b; unsigned int type; unsigned int count; unsigned int loc; unsigned int clen; vsd = (struct volume_structure_descriptor *) get_buffer(id, off + UDF_VSD_OFFSET, 0x200); if (vsd == NULL) return -1; if (strncmp(vsd->id, "NSR02", 5) == 0) goto blocksize; if (strncmp(vsd->id, "NSR03", 5) == 0) goto blocksize; if (strncmp(vsd->id, "BEA01", 5) == 0) goto blocksize; if (strncmp(vsd->id, "BOOT2", 5) == 0) goto blocksize; if (strncmp(vsd->id, "CD001", 5) == 0) goto blocksize; if (strncmp(vsd->id, "CDW02", 5) == 0) goto blocksize; if (strncmp(vsd->id, "TEA03", 5) == 0) goto blocksize; return -1; blocksize: /* search the next VSD to get the logical block size of the volume */ for (bs = 0x800; bs < 0x8000; bs += 0x800) { vsd = (struct volume_structure_descriptor *) get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800); if (vsd == NULL) return -1; dbg("test for blocksize: 0x%x", bs); if (vsd->id[0] != '\0') goto nsr; } return -1; nsr: /* search the list of VSDs for a NSR descriptor */ for (b = 0; b < 64; b++) { vsd = (struct volume_structure_descriptor *) get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800); if (vsd == NULL) return -1; dbg("vsd: %c%c%c%c%c", vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]); if (vsd->id[0] == '\0') return -1; if (strncmp(vsd->id, "NSR02", 5) == 0) goto anchor; if (strncmp(vsd->id, "NSR03", 5) == 0) goto anchor; } return -1; anchor: /* read anchor volume descriptor */ vd = (struct volume_descriptor *) get_buffer(id, off + (256 * bs), 0x200); if (vd == NULL) return -1; type = le16_to_cpu(vd->tag.id); if (type != 2) /* TAG_ID_AVDP */ goto found; /* get desriptor list address and block count */ count = le32_to_cpu(vd->type.anchor.length) / bs; loc = le32_to_cpu(vd->type.anchor.location); dbg("0x%x descriptors starting at logical secor 0x%x", count, loc); /* pick the primary descriptor from the list */ for (b = 0; b < count; b++) { vd = (struct volume_descriptor *) get_buffer(id, off + ((loc + b) * bs), 0x200); if (vd == NULL) return -1; type = le16_to_cpu(vd->tag.id); dbg("descriptor type %i", type); /* check validity */ if (type == 0) goto found; if (le32_to_cpu(vd->tag.location) != loc + b) goto found; if (type == 1) /* TAG_ID_PVD */ goto pvd; } goto found; pvd: set_label_raw(id, &(vd->type.primary.ident.clen), 32); clen = vd->type.primary.ident.clen; dbg("label string charsize=%i bit", clen); if (clen == 8) set_label_string(id, vd->type.primary.ident.c, 31); else if (clen == 16) set_label_unicode16(id, vd->type.primary.ident.c, BE,31); found: id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_UDF; id->type = "udf"; return 0; } #define ISO_SUPERBLOCK_OFFSET 0x8000 static int probe_iso9660(struct volume_id *id, __u64 off) { union iso_super_block { struct iso_header { __u8 type; __u8 id[5]; __u8 version; __u8 unused1; __u8 system_id[32]; __u8 volume_id[32]; } __attribute__((__packed__)) iso; struct hs_header { __u8 foo[8]; __u8 type; __u8 id[4]; __u8 version; } __attribute__((__packed__)) hs; } __attribute__((__packed__)) *is; is = (union iso_super_block *) get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200); if (is == NULL) return -1; if (strncmp(is->iso.id, "CD001", 5) == 0) { set_label_raw(id, is->iso.volume_id, 32); set_label_string(id, is->iso.volume_id, 32); goto found; } if (strncmp(is->hs.id, "CDROM", 5) == 0) goto found; return -1; found: id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_ISO9660; id->type = "iso9660"; return 0; } #define UFS_MAGIC 0x00011954 #define UFS2_MAGIC 0x19540119 #define UFS_MAGIC_FEA 0x00195612 #define UFS_MAGIC_LFN 0x00095014 static int probe_ufs(struct volume_id *id, __u64 off) { struct ufs_super_block { __u32 fs_link; __u32 fs_rlink; __u32 fs_sblkno; __u32 fs_cblkno; __u32 fs_iblkno; __u32 fs_dblkno; __u32 fs_cgoffset; __u32 fs_cgmask; __u32 fs_time; __u32 fs_size; __u32 fs_dsize; __u32 fs_ncg; __u32 fs_bsize; __u32 fs_fsize; __u32 fs_frag; __u32 fs_minfree; __u32 fs_rotdelay; __u32 fs_rps; __u32 fs_bmask; __u32 fs_fmask; __u32 fs_bshift; __u32 fs_fshift; __u32 fs_maxcontig; __u32 fs_maxbpg; __u32 fs_fragshift; __u32 fs_fsbtodb; __u32 fs_sbsize; __u32 fs_csmask; __u32 fs_csshift; __u32 fs_nindir; __u32 fs_inopb; __u32 fs_nspf; __u32 fs_optim; __u32 fs_npsect_state; __u32 fs_interleave; __u32 fs_trackskew; __u32 fs_id[2]; __u32 fs_csaddr; __u32 fs_cssize; __u32 fs_cgsize; __u32 fs_ntrak; __u32 fs_nsect; __u32 fs_spc; __u32 fs_ncyl; __u32 fs_cpg; __u32 fs_ipg; __u32 fs_fpg; struct ufs_csum { __u32 cs_ndir; __u32 cs_nbfree; __u32 cs_nifree; __u32 cs_nffree; } __attribute__((__packed__)) fs_cstotal; __s8 fs_fmod; __s8 fs_clean; __s8 fs_ronly; __s8 fs_flags; union { struct { __s8 fs_fsmnt[512]; __u32 fs_cgrotor; __u32 fs_csp[31]; __u32 fs_maxcluster; __u32 fs_cpc; __u16 fs_opostbl[16][8]; } __attribute__((__packed__)) fs_u1; struct { __s8 fs_fsmnt[468]; __u8 fs_volname[32]; __u64 fs_swuid; __s32 fs_pad; __u32 fs_cgrotor; __u32 fs_ocsp[28]; __u32 fs_contigdirs; __u32 fs_csp; __u32 fs_maxcluster; __u32 fs_active; __s32 fs_old_cpc; __s32 fs_maxbsize; __s64 fs_sparecon64[17]; __s64 fs_sblockloc; struct ufs2_csum_total { __u64 cs_ndir; __u64 cs_nbfree; __u64 cs_nifree; __u64 cs_nffree; __u64 cs_numclusters; __u64 cs_spare[3]; } __attribute__((__packed__)) fs_cstotal; struct ufs_timeval { __s32 tv_sec; __s32 tv_usec; } __attribute__((__packed__)) fs_time; __s64 fs_size; __s64 fs_dsize; __u64 fs_csaddr; __s64 fs_pendingblocks; __s32 fs_pendinginodes; } __attribute__((__packed__)) fs_u2; } fs_u11; union { struct { __s32 fs_sparecon[53]; __s32 fs_reclaim; __s32 fs_sparecon2[1]; __s32 fs_state; __u32 fs_qbmask[2]; __u32 fs_qfmask[2]; } __attribute__((__packed__)) fs_sun; struct { __s32 fs_sparecon[53]; __s32 fs_reclaim; __s32 fs_sparecon2[1]; __u32 fs_npsect; __u32 fs_qbmask[2]; __u32 fs_qfmask[2]; } __attribute__((__packed__)) fs_sunx86; struct { __s32 fs_sparecon[50]; __s32 fs_contigsumsize; __s32 fs_maxsymlinklen; __s32 fs_inodefmt; __u32 fs_maxfilesize[2]; __u32 fs_qbmask[2]; __u32 fs_qfmask[2]; __s32 fs_state; } __attribute__((__packed__)) fs_44; } fs_u2; __s32 fs_postblformat; __s32 fs_nrpos; __s32 fs_postbloff; __s32 fs_rotbloff; __u32 fs_magic; __u8 fs_space[1]; } __attribute__((__packed__)) *ufs; __u32 magic; int i; int offsets[] = {0, 8, 64, 256, -1}; for (i = 0; offsets[i] >= 0; i++) { ufs = (struct ufs_super_block *) get_buffer(id, off + (offsets[i] * 0x400), 0x800); if (ufs == NULL) return -1; dbg("offset 0x%x", offsets[i] * 0x400); magic = be32_to_cpu(ufs->fs_magic); if ((magic == UFS_MAGIC) || (magic == UFS2_MAGIC) || (magic == UFS_MAGIC_FEA) || (magic == UFS_MAGIC_LFN)) { dbg("magic 0x%08x(be)", magic); goto found; } magic = le32_to_cpu(ufs->fs_magic); if ((magic == UFS_MAGIC) || (magic == UFS2_MAGIC) || (magic == UFS_MAGIC_FEA) || (magic == UFS_MAGIC_LFN)) { dbg("magic 0x%08x(le)", magic); goto found; } } return -1; found: id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_UFS; id->type = "ufs"; return 0; } static int probe_mac_partition_map(struct volume_id *id, __u64 off) { struct mac_driver_desc { __u8 signature[2]; __u16 block_size; __u32 block_count; } __attribute__((__packed__)) *driver; struct mac_partition { __u8 signature[2]; __u16 res1; __u32 map_count; __u32 start_block; __u32 block_count; __u8 name[32]; __u8 type[32]; } __attribute__((__packed__)) *part; const __u8 *buf; buf = get_buffer(id, off, 0x200); if (buf == NULL) return -1; part = (struct mac_partition *) buf; if ((strncmp(part->signature, "PM", 2) == 0) && (strncmp(part->type, "Apple_partition_map", 19) == 0)) { /* linux creates an own subdevice for the map * just return the type if the drive header is missing */ id->usage_id = VOLUME_ID_PARTITIONTABLE; id->type_id = VOLUME_ID_MACPARTMAP; id->type = "mac_partition_map"; return 0; } driver = (struct mac_driver_desc *) buf; if (strncmp(driver->signature, "ER", 2) == 0) { /* we are on a main device, like a CD * just try to probe the first partition from the map */ unsigned int bsize = be16_to_cpu(driver->block_size); int part_count; int i; /* get first entry of partition table */ buf = get_buffer(id, off + bsize, 0x200); if (buf == NULL) return -1; part = (struct mac_partition *) buf; if (strncmp(part->signature, "PM", 2) != 0) return -1; part_count = be32_to_cpu(part->map_count); dbg("expecting %d partition entries", part_count); if (id->partitions != NULL) free(id->partitions); id->partitions = malloc(part_count * sizeof(struct volume_id_partition)); if (id->partitions == NULL) return -1; memset(id->partitions, 0x00, sizeof(struct volume_id_partition)); id->partition_count = part_count; for (i = 0; i < part_count; i++) { __u64 poff; __u64 plen; buf = get_buffer(id, off + ((i+1) * bsize), 0x200); if (buf == NULL) return -1; part = (struct mac_partition *) buf; if (strncmp(part->signature, "PM", 2) != 0) return -1; poff = be32_to_cpu(part->start_block) * bsize; plen = be32_to_cpu(part->block_count) * bsize; dbg("found '%s' partition entry at 0x%llx, len 0x%llx", part->type, poff, plen); id->partitions[i].off = poff; id->partitions[i].len = plen; if (strncmp(part->type, "Apple_Free", 10) == 0) { id->partitions[i].usage_id = VOLUME_ID_UNUSED; } else if (strncmp(part->type, "Apple_partition_map", 19) == 0) { id->partitions[i].usage_id = VOLUME_ID_PARTITIONTABLE; id->partitions[i].type_id = VOLUME_ID_MACPARTMAP; } else { id->partitions[i].usage_id = VOLUME_ID_UNPROBED; } } id->usage_id = VOLUME_ID_PARTITIONTABLE; id->type_id = VOLUME_ID_MACPARTMAP; id->type = "mac_partition_map"; return 0; } return -1; } #define HFS_SUPERBLOCK_OFFSET 0x400 #define HFS_NODE_LEAF 0xff #define HFSPLUS_POR_CNID 1 static int probe_hfs_hfsplus(struct volume_id *id, __u64 off) { struct finder_info { __u32 boot_folder; __u32 start_app; __u32 open_folder; __u32 os9_folder; __u32 reserved; __u32 osx_folder; __u8 id[8]; } __attribute__((__packed__)); struct hfs_mdb { __u8 signature[2]; __u32 cr_date; __u32 ls_Mod; __u16 atrb; __u16 nm_fls; __u16 vbm_st; __u16 alloc_ptr; __u16 nm_al_blks; __u32 al_blk_size; __u32 clp_size; __u16 al_bl_st; __u32 nxt_cnid; __u16 free_bks; __u8 label_len; __u8 label[27]; __u32 vol_bkup; __u16 vol_seq_num; __u32 wr_cnt; __u32 xt_clump_size; __u32 ct_clump_size; __u16 num_root_dirs; __u32 file_count; __u32 dir_count; struct finder_info finfo; __u8 embed_sig[2]; __u16 embed_startblock; __u16 embed_blockcount; } __attribute__((__packed__)) *hfs; struct hfsplus_bnode_descriptor { __u32 next; __u32 prev; __u8 type; __u8 height; __u16 num_recs; __u16 reserved; } __attribute__((__packed__)); struct hfsplus_bheader_record { __u16 depth; __u32 root; __u32 leaf_count; __u32 leaf_head; __u32 leaf_tail; __u16 node_size; } __attribute__((__packed__)); struct hfsplus_catalog_key { __u16 key_len; __u32 parent_id; __u16 unicode_len; __u8 unicode[255 * 2]; } __attribute__((__packed__)); struct hfsplus_extent { __u32 start_block; __u32 block_count; } __attribute__((__packed__)); struct hfsplus_fork { __u64 total_size; __u32 clump_size; __u32 total_blocks; struct hfsplus_extent extents[8]; } __attribute__((__packed__)); struct hfsplus_vol_header { __u8 signature[2]; __u16 version; __u32 attributes; __u32 last_mount_vers; __u32 reserved; __u32 create_date; __u32 modify_date; __u32 backup_date; __u32 checked_date; __u32 file_count; __u32 folder_count; __u32 blocksize; __u32 total_blocks; __u32 free_blocks; __u32 next_alloc; __u32 rsrc_clump_sz; __u32 data_clump_sz; __u32 next_cnid; __u32 write_count; __u64 encodings_bmp; struct finder_info finfo; struct hfsplus_fork alloc_file; struct hfsplus_fork ext_file; struct hfsplus_fork cat_file; struct hfsplus_fork attr_file; struct hfsplus_fork start_file; } __attribute__((__packed__)) *hfsplus; unsigned int blocksize; unsigned int cat_block; unsigned int cat_block_count; unsigned int cat_off; unsigned int cat_len; unsigned int leaf_node_head; unsigned int leaf_node_size; unsigned int alloc_block_size; unsigned int alloc_first_block; unsigned int embed_first_block; struct hfsplus_bnode_descriptor *descr; struct hfsplus_bheader_record *bnode; struct hfsplus_catalog_key *key; unsigned int label_len; const __u8 *buf; buf = get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200); if (buf == NULL) return -1; hfs = (struct hfs_mdb *) buf; if (strncmp(hfs->signature, "BD", 2) != 0) goto checkplus; /* it may be just a hfs wrapper for hfs+ */ if (strncmp(hfs->embed_sig, "H+", 2) == 0) { alloc_block_size = be32_to_cpu(hfs->al_blk_size); dbg("alloc_block_size 0x%x", alloc_block_size); alloc_first_block = be16_to_cpu(hfs->al_bl_st); dbg("alloc_first_block 0x%x", alloc_first_block); embed_first_block = be16_to_cpu(hfs->embed_startblock); dbg("embed_first_block 0x%x", embed_first_block); off += (alloc_first_block * 512) + (embed_first_block * alloc_block_size); dbg("hfs wrapped hfs+ found at offset 0x%llx", off); buf = get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200); if (buf == NULL) return -1; goto checkplus; } if (hfs->label_len > 0 && hfs->label_len < 28) { set_label_raw(id, hfs->label, hfs->label_len); set_label_string(id, hfs->label, hfs->label_len) ; } id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_HFS; id->type = "hfs"; return 0; checkplus: hfsplus = (struct hfsplus_vol_header *) buf; if (strncmp(hfsplus->signature, "H+", 2) == 0) goto hfsplus; if (strncmp(hfsplus->signature, "HX", 2) == 0) goto hfsplus; return -1; hfsplus: blocksize = be32_to_cpu(hfsplus->blocksize); cat_block = be32_to_cpu(hfsplus->cat_file.extents[0].start_block); cat_block_count = be32_to_cpu(hfsplus->cat_file.extents[0].block_count); cat_off = (cat_block * blocksize); cat_len = cat_block_count * blocksize; dbg("catalog start 0x%llx, len 0x%x", off + cat_off, cat_len); buf = get_buffer(id, off + cat_off, 0x2000); if (buf == NULL) goto found; bnode = (struct hfsplus_bheader_record *) &buf[sizeof(struct hfsplus_bnode_descriptor)]; leaf_node_head = be32_to_cpu(bnode->leaf_head); leaf_node_size = be16_to_cpu(bnode->node_size); dbg("catalog leaf node 0x%x, size 0x%x", leaf_node_head, leaf_node_size); buf = get_buffer(id, off + cat_off + (leaf_node_head * leaf_node_size), leaf_node_size); if (buf == NULL) goto found; descr = (struct hfsplus_bnode_descriptor *) buf; dbg("descriptor type 0x%x", descr->type); if (descr->type != HFS_NODE_LEAF) goto found; key = (struct hfsplus_catalog_key *) &buf[sizeof(struct hfsplus_bnode_descriptor)]; dbg("parent id 0x%x", be32_to_cpu(key->parent_id)); if (be32_to_cpu(key->parent_id) != HFSPLUS_POR_CNID) goto found; label_len = be16_to_cpu(key->unicode_len) * 2; dbg("label unicode16 len %i", label_len); set_label_raw(id, key->unicode, label_len); set_label_unicode16(id, key->unicode, BE, label_len); found: id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_HFSPLUS; id->type = "hfsplus"; return 0; } #define MFT_RECORD_VOLUME 3 #define MFT_RECORD_ATTR_VOLUME_NAME 0x60 #define MFT_RECORD_ATTR_VOLUME_INFO 0x70 #define MFT_RECORD_ATTR_OBJECT_ID 0x40 #define MFT_RECORD_ATTR_END 0xffffffffu static int probe_ntfs(struct volume_id *id, __u64 off) { struct ntfs_super_block { __u8 jump[3]; __u8 oem_id[8]; __u16 bytes_per_sector; __u8 sectors_per_cluster; __u16 reserved_sectors; __u8 fats; __u16 root_entries; __u16 sectors; __u8 media_type; __u16 sectors_per_fat; __u16 sectors_per_track; __u16 heads; __u32 hidden_sectors; __u32 large_sectors; __u16 unused[2]; __u64 number_of_sectors; __u64 mft_cluster_location; __u64 mft_mirror_cluster_location; __s8 cluster_per_mft_record; __u8 reserved1[3]; __s8 cluster_per_index_record; __u8 reserved2[3]; __u8 volume_serial[8]; __u16 checksum; } __attribute__((__packed__)) *ns; struct master_file_table_record { __u8 magic[4]; __u16 usa_ofs; __u16 usa_count; __u64 lsn; __u16 sequence_number; __u16 link_count; __u16 attrs_offset; __u16 flags; __u32 bytes_in_use; __u32 bytes_allocated; } __attribute__((__packed__)) *mftr; struct file_attribute { __u32 type; __u32 len; __u8 non_resident; __u8 name_len; __u16 name_offset; __u16 flags; __u16 instance; __u32 value_len; __u16 value_offset; } __attribute__((__packed__)) *attr; struct volume_info { __u64 reserved; __u8 major_ver; __u8 minor_ver; } __attribute__((__packed__)) *info; unsigned int sector_size; unsigned int cluster_size; __u64 mft_cluster; __u64 mft_off; unsigned int mft_record_size; unsigned int attr_type; unsigned int attr_off; unsigned int attr_len; unsigned int val_off; unsigned int val_len; const __u8 *buf; const __u8 *val; ns = (struct ntfs_super_block *) get_buffer(id, off, 0x200); if (ns == NULL) return -1; if (strncmp(ns->oem_id, "NTFS", 4) != 0) return -1; set_uuid(id, ns->volume_serial, 8); sector_size = le16_to_cpu(ns->bytes_per_sector); cluster_size = ns->sectors_per_cluster * sector_size; mft_cluster = le64_to_cpu(ns->mft_cluster_location); mft_off = mft_cluster * cluster_size; if (ns->cluster_per_mft_record < 0) /* size = -log2(mft_record_size); normally 1024 Bytes */ mft_record_size = 1 << -ns->cluster_per_mft_record; else mft_record_size = ns->cluster_per_mft_record * cluster_size; dbg("sectorsize 0x%x", sector_size); dbg("clustersize 0x%x", cluster_size); dbg("mftcluster %lli", mft_cluster); dbg("mftoffset 0x%llx", mft_off); dbg("cluster per mft_record %i", ns->cluster_per_mft_record); dbg("mft record size %i", mft_record_size); buf = get_buffer(id, off + mft_off + (MFT_RECORD_VOLUME * mft_record_size), mft_record_size); if (buf == NULL) goto found; mftr = (struct master_file_table_record*) buf; dbg("mftr->magic '%c%c%c%c'", mftr->magic[0], mftr->magic[1], mftr->magic[2], mftr->magic[3]); if (strncmp(mftr->magic, "FILE", 4) != 0) goto found; attr_off = le16_to_cpu(mftr->attrs_offset); dbg("file $Volume's attributes are at offset %i", attr_off); while (1) { attr = (struct file_attribute*) &buf[attr_off]; attr_type = le32_to_cpu(attr->type); attr_len = le16_to_cpu(attr->len); val_off = le16_to_cpu(attr->value_offset); val_len = le32_to_cpu(attr->value_len); attr_off += attr_len; if (attr_len == 0) break; if (attr_off >= mft_record_size) break; if (attr_type == MFT_RECORD_ATTR_END) break; dbg("found attribute type 0x%x, len %i, at offset %i", attr_type, attr_len, attr_off); if (attr_type == MFT_RECORD_ATTR_VOLUME_INFO) { dbg("found info, len %i", val_len); info = (struct volume_info*) (((__u8 *) attr) + val_off); snprintf(id->type_version, VOLUME_ID_FORMAT_SIZE-1, "%u.%u", info->major_ver, info->minor_ver); } if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { dbg("found label, len %i", val_len); if (val_len > VOLUME_ID_LABEL_SIZE) val_len = VOLUME_ID_LABEL_SIZE; val = ((__u8 *) attr) + val_off; set_label_raw(id, val, val_len); set_label_unicode16(id, val, LE, val_len); } } found: id->usage_id = VOLUME_ID_FILESYSTEM; id->type_id = VOLUME_ID_NTFS; id->type = "ntfs"; return 0; } #define LARGEST_PAGESIZE 0x4000 static int probe_swap(struct volume_id *id, __u64 off) { const __u8 *sig; unsigned int page; /* huhh, the swap signature is on the end of the PAGE_SIZE */ for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) { sig = get_buffer(id, off + page-10, 10); if (sig == NULL) return -1; if (strncmp(sig, "SWAP-SPACE", 10) == 0) { strcpy(id->type_version, "1"); goto found; } if (strncmp(sig, "SWAPSPACE2", 10) == 0) { strcpy(id->type_version, "2"); goto found; } } return -1; found: id->usage_id = VOLUME_ID_OTHER; id->type_id = VOLUME_ID_SWAP; id->type = "swap"; return 0; } /* probe volume for filesystem type and try to read label+uuid */ int volume_id_probe(struct volume_id *id, enum volume_id_type type, unsigned long long off, unsigned long long size) { int rc; if (id == NULL) return -EINVAL; switch (type) { case VOLUME_ID_MSDOSPARTTABLE: rc = probe_msdos_part_table(id, off); break; case VOLUME_ID_EXT3: case VOLUME_ID_EXT2: rc = probe_ext(id, off); break; case VOLUME_ID_REISERFS: rc = probe_reiserfs(id, off); break; case VOLUME_ID_XFS: rc = probe_xfs(id, off); break; case VOLUME_ID_JFS: rc = probe_jfs(id, off); break; case VOLUME_ID_VFAT: rc = probe_vfat(id, off); break; case VOLUME_ID_UDF: rc = probe_udf(id, off); break; case VOLUME_ID_ISO9660: rc = probe_iso9660(id, off); break; case VOLUME_ID_MACPARTMAP: rc = probe_mac_partition_map(id, off); break; case VOLUME_ID_HFS: case VOLUME_ID_HFSPLUS: rc = probe_hfs_hfsplus(id, off); break; case VOLUME_ID_UFS: rc = probe_ufs(id, off); break; case VOLUME_ID_NTFS: rc = probe_ntfs(id, off); break; case VOLUME_ID_SWAP: rc = probe_swap(id, off); break; case VOLUME_ID_LINUX_RAID: rc = probe_linux_raid(id, off, size); break; case VOLUME_ID_LVM1: rc = probe_lvm1(id, off); break; case VOLUME_ID_LVM2: rc = probe_lvm2(id, off); break; case VOLUME_ID_ALL: default: rc = probe_linux_raid(id, off, size); if (rc == 0) break; /* signature in the first block */ rc = probe_ntfs(id, off); if (rc == 0) break; rc = probe_vfat(id, off); if (rc == 0) break; rc = probe_msdos_part_table(id, off); if (rc == 0) break; rc = probe_mac_partition_map(id, off); if (rc == 0) break; rc = probe_xfs(id, off); if (rc == 0) break; /* fill buffer with maximum */ get_buffer(id, 0, SB_BUFFER_SIZE); rc = probe_swap(id, off); if (rc == 0) break; rc = probe_ext(id, off); if (rc == 0) break; rc = probe_reiserfs(id, off); if (rc == 0) break; rc = probe_jfs(id, off); if (rc == 0) break; rc = probe_udf(id, off); if (rc == 0) break; rc = probe_iso9660(id, off); if (rc == 0) break; rc = probe_hfs_hfsplus(id, off); if (rc == 0) break; rc = probe_ufs(id, off); if (rc == 0) break; rc = probe_lvm1(id, off); if (rc == 0) break; rc = probe_lvm2(id, off); if (rc == 0) break; rc = -1; } /* If the filestystem in recognized, we free the allocated buffers, otherwise they will stay in place for the possible next probe call */ if (rc == 0) free_buffer(id); return rc; } /* open volume by already open file descriptor */ struct volume_id *volume_id_open_fd(int fd) { struct volume_id *id; id = malloc(sizeof(struct volume_id)); if (id == NULL) return NULL; memset(id, 0x00, sizeof(struct volume_id)); id->fd = fd; return id; } /* open volume by device node */ struct volume_id *volume_id_open_node(const char *path) { struct volume_id *id; int fd; fd = open(path, O_RDONLY | O_NONBLOCK); if (fd < 0) { dbg("unable to open '%s'", path); return NULL; } id = volume_id_open_fd(fd); if (id == NULL) return NULL; /* close fd on device close */ id->fd_close = 1; return id; } /* open volume by major/minor */ struct volume_id *volume_id_open_dev_t(dev_t devt) { struct volume_id *id; __u8 tmp_node[VOLUME_ID_PATH_MAX]; snprintf(tmp_node, VOLUME_ID_PATH_MAX, "/tmp/volume-%u-%u-%u", getpid(), major(devt), minor(devt)); tmp_node[VOLUME_ID_PATH_MAX] = '\0'; /* create tempory node to open the block device */ unlink(tmp_node); if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0) return NULL; id = volume_id_open_node(tmp_node); unlink(tmp_node); return id; } /* free allocated volume info */ void volume_id_close(struct volume_id *id) { if (id == NULL) return; if (id->fd_close != 0) close(id->fd); free_buffer(id); if (id->partitions != NULL) free(id->partitions); free(id); }