| /* |
| * probe.c - identify a block device by its contents, and return a dev |
| * struct with the details |
| * |
| * Copyright (C) 1999 by Andries Brouwer |
| * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o |
| * Copyright (C) 2001 by Andreas Dilger |
| * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the |
| * GNU Lesser General Public License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/types.h> |
| #ifdef HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #ifdef HAVE_SYS_MKDEV_H |
| #include <sys/mkdev.h> |
| #endif |
| #ifdef HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| #include "blkidP.h" |
| #include "uuid/uuid.h" |
| #include "probe.h" |
| |
| static int figure_label_len(const unsigned char *label, int len) |
| { |
| const unsigned char *end = label + len - 1; |
| |
| while ((*end == ' ' || *end == 0) && end >= label) |
| --end; |
| if (end >= label) { |
| label = label; |
| return end - label + 1; |
| } |
| return 0; |
| } |
| |
| static unsigned char *get_buffer(struct blkid_probe *pr, |
| unsigned off, size_t len) |
| { |
| ssize_t ret_read; |
| unsigned char *newbuf; |
| |
| if (off + len <= SB_BUFFER_SIZE) { |
| if (!pr->sbbuf) { |
| pr->sbbuf = malloc(SB_BUFFER_SIZE); |
| if (!pr->sbbuf) |
| return NULL; |
| if (lseek(pr->fd, 0, SEEK_SET) < 0) |
| return NULL; |
| ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE); |
| if (ret_read < 0) |
| ret_read = 0; |
| pr->sb_valid = ret_read; |
| } |
| if (off+len > pr->sb_valid) |
| return NULL; |
| return pr->sbbuf + off; |
| } else { |
| if (len > pr->buf_max) { |
| newbuf = realloc(pr->buf, len); |
| if (newbuf == NULL) |
| return NULL; |
| pr->buf = newbuf; |
| pr->buf_max = len; |
| } |
| if (lseek(pr->fd, off, SEEK_SET) < 0) |
| return NULL; |
| ret_read = read(pr->fd, pr->buf, len); |
| if (ret_read != (ssize_t) len) |
| return NULL; |
| return pr->buf; |
| } |
| } |
| |
| |
| /* |
| * This is a special case code to check for an MDRAID device. We do |
| * this special since it requires checking for a superblock at the end |
| * of the device. |
| */ |
| static int check_mdraid(int fd, unsigned char *ret_uuid) |
| { |
| struct mdp_superblock_s *md; |
| blkid_loff_t offset; |
| char buf[4096]; |
| |
| if (fd < 0) |
| return -BLKID_ERR_PARAM; |
| |
| offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; |
| |
| if (blkid_llseek(fd, offset, 0) < 0 || |
| read(fd, buf, 4096) != 4096) |
| return -BLKID_ERR_IO; |
| |
| /* Check for magic number */ |
| if (memcmp("\251+N\374", buf, 4)) |
| return -BLKID_ERR_PARAM; |
| |
| if (!ret_uuid) |
| return 0; |
| *ret_uuid = 0; |
| |
| /* The MD UUID is not contiguous in the superblock, make it so */ |
| md = (struct mdp_superblock_s *)buf; |
| if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { |
| memcpy(ret_uuid, &md->set_uuid0, 4); |
| memcpy(ret_uuid, &md->set_uuid1, 12); |
| } |
| return 0; |
| } |
| |
| static void set_uuid(blkid_dev dev, uuid_t uuid, char *tag) |
| { |
| char str[37]; |
| |
| if (!uuid_is_null(uuid)) { |
| uuid_unparse(uuid, str); |
| blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str)); |
| } |
| } |
| |
| static void get_ext2_info(blkid_dev dev, unsigned char *buf) |
| { |
| struct ext2_super_block *es = (struct ext2_super_block *) buf; |
| const char *label = 0; |
| |
| DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", |
| blkid_le32(es->s_feature_compat), |
| blkid_le32(es->s_feature_incompat), |
| blkid_le32(es->s_feature_ro_compat))); |
| |
| if (strlen(es->s_volume_name)) |
| label = es->s_volume_name; |
| blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); |
| |
| set_uuid(dev, es->s_uuid, 0); |
| } |
| |
| static int probe_ext3(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct ext2_super_block *es; |
| es = (struct ext2_super_block *)buf; |
| |
| /* Distinguish between jbd and ext2/3 fs */ |
| if (blkid_le32(es->s_feature_incompat) & |
| EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) |
| return -BLKID_ERR_PARAM; |
| |
| /* Distinguish between ext3 and ext2 */ |
| if (!(blkid_le32(es->s_feature_compat) & |
| EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| return -BLKID_ERR_PARAM; |
| |
| get_ext2_info(probe->dev, buf); |
| |
| if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && |
| !uuid_is_null(es->s_journal_uuid)) |
| set_uuid(probe->dev, es->s_journal_uuid, "EXT_JOURNAL"); |
| |
| blkid_set_tag(probe->dev, "SEC_TYPE", "ext2", sizeof("ext2")); |
| |
| return 0; |
| } |
| |
| static int probe_ext2(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct ext2_super_block *es; |
| |
| es = (struct ext2_super_block *)buf; |
| |
| /* Distinguish between jbd and ext2/3 fs */ |
| if (blkid_le32(es->s_feature_incompat) & |
| EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) |
| return -BLKID_ERR_PARAM; |
| |
| /* Distinguish between ext3 and ext2 */ |
| if ((blkid_le32(es->s_feature_compat) & |
| EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| return -BLKID_ERR_PARAM; |
| |
| get_ext2_info(probe->dev, buf); |
| |
| return 0; |
| } |
| |
| static int probe_jbd(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct ext2_super_block *es = (struct ext2_super_block *) buf; |
| |
| if (!(blkid_le32(es->s_feature_incompat) & |
| EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) |
| return -BLKID_ERR_PARAM; |
| |
| get_ext2_info(probe->dev, buf); |
| |
| return 0; |
| } |
| |
| #define FAT_ATTR_VOLUME_ID 0x08 |
| #define FAT_ATTR_DIR 0x10 |
| #define FAT_ATTR_LONG_NAME 0x0f |
| #define FAT_ATTR_MASK 0x3f |
| #define FAT_ENTRY_FREE 0xe5 |
| |
| static char *no_name = "NO NAME "; |
| |
| static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| if (dir[i].name[0] == 0x00) |
| break; |
| |
| if ((dir[i].name[0] == FAT_ENTRY_FREE) || |
| (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || |
| ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) |
| continue; |
| |
| if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == |
| FAT_ATTR_VOLUME_ID) { |
| return dir[i].name; |
| } |
| } |
| return 0; |
| } |
| |
| /* FAT label extraction from the root directory taken from Kay |
| * Sievers's volume_id library */ |
| static int probe_fat(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct vfat_super_block *vs = (struct vfat_super_block *) buf; |
| struct msdos_super_block *ms = (struct msdos_super_block *) buf; |
| struct vfat_dir_entry *dir; |
| char serno[10]; |
| const unsigned char *label = 0, *vol_label = 0, *tmp; |
| unsigned char *vol_serno; |
| int label_len = 0, maxloop = 100; |
| __u16 sector_size, dir_entries, reserved; |
| __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; |
| __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; |
| |
| /* sector size check */ |
| tmp = &ms->ms_sector_size; |
| sector_size = tmp[0] + tmp[1] << 8; |
| if (sector_size != 0x200 && sector_size != 0x400 && |
| sector_size != 0x800 && sector_size != 0x1000) |
| return 1; |
| |
| tmp = &ms->ms_dir_entries; |
| dir_entries = tmp[0] + tmp[1] << 8; |
| reserved = blkid_le16(ms->ms_reserved); |
| tmp = &ms->ms_sectors; |
| sect_count = tmp[0] + tmp[1] << 8; |
| if (sect_count == 0) |
| sect_count = blkid_le32(ms->ms_total_sect); |
| |
| fat_length = blkid_le16(ms->ms_fat_length); |
| if (fat_length == 0) |
| fat_length = blkid_le32(vs->vs_fat32_length); |
| |
| fat_size = fat_length * ms->ms_fats; |
| dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + |
| (sector_size-1)) / sector_size; |
| |
| cluster_count = sect_count - (reserved + fat_size + dir_size); |
| cluster_count /= ms->ms_cluster_size; |
| |
| if (cluster_count > FAT32_MAX) |
| return 1; |
| |
| if (ms->ms_fat_length) { |
| /* the label may be an attribute in the root directory */ |
| root_start = (reserved + fat_size) * sector_size; |
| root_dir_entries = vs->vs_dir_entries[0] + |
| (vs->vs_dir_entries[1] << 8); |
| |
| buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); |
| dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, |
| buf_size); |
| if (dir) |
| vol_label = search_fat_label(dir, root_dir_entries); |
| |
| if (!vol_label || !memcmp(vol_label, no_name, 11)) |
| vol_label = ms->ms_label; |
| vol_serno = ms->ms_serno; |
| |
| blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", |
| sizeof("msdos")); |
| } else { |
| /* Search the FAT32 root dir for the label attribute */ |
| buf_size = vs->vs_cluster_size * sector_size; |
| start_data_sect = reserved + fat_size; |
| |
| next = blkid_le32(vs->vs_root_cluster); |
| while (next && --maxloop) { |
| __u32 next_sect_off; |
| __u64 next_off, fat_entry_off; |
| int count; |
| |
| next_sect_off = (next - 2) * vs->vs_cluster_size; |
| next_off = (start_data_sect + next_sect_off) * |
| sector_size; |
| |
| dir = (struct vfat_dir_entry *) |
| get_buffer(probe, next_off, buf_size); |
| if (dir == NULL) |
| break; |
| |
| count = buf_size / sizeof(struct vfat_dir_entry); |
| |
| vol_label = search_fat_label(dir, count); |
| if (vol_label) |
| break; |
| |
| /* get FAT entry */ |
| fat_entry_off = (reserved * sector_size) + |
| (next * sizeof(__u32)); |
| buf = get_buffer(probe, fat_entry_off, buf_size); |
| if (buf == NULL) |
| break; |
| |
| /* set next cluster */ |
| next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); |
| } |
| |
| if (!vol_label || !memcmp(vol_label, no_name, 11)) |
| vol_label = vs->vs_label; |
| vol_serno = vs->vs_serno; |
| } |
| |
| if (vol_label && memcmp(vol_label, no_name, 11)) { |
| label = vol_label; |
| label_len = figure_label_len(vol_label, 11); |
| } |
| |
| /* We can't just print them as %04X, because they are unaligned */ |
| sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], |
| vol_serno[1], vol_serno[0]); |
| |
| blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); |
| blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); |
| |
| return 0; |
| } |
| |
| /* |
| * The FAT filesystem could be without a magic string in superblock |
| * (e.g. old floppies). This heuristic for FAT detection is inspired |
| * by http://vrfy.org/projects/volume_id/ and Linux kernel. |
| * [7-Jul-2005, Karel Zak <kzak@redhat.com>] |
| */ |
| static int probe_fat_nomagic(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct vfat_super_block *vs; |
| |
| vs = (struct vfat_super_block *)buf; |
| |
| /* heads check */ |
| if (vs->vs_heads == 0) |
| return 1; |
| |
| /* cluster size check*/ |
| if (vs->vs_cluster_size == 0 || |
| (vs->vs_cluster_size & (vs->vs_cluster_size-1))) |
| return 1; |
| |
| /* media check */ |
| if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0) |
| return 1; |
| |
| /* fat counts(Linux kernel expects at least 1 FAT table) */ |
| if (!vs->vs_fats) |
| return 1; |
| |
| return probe_fat(probe, id, buf); |
| } |
| |
| static int probe_xfs(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct xfs_super_block *xs; |
| const char *label = 0; |
| |
| xs = (struct xfs_super_block *)buf; |
| |
| if (strlen(xs->xs_fname)) |
| label = xs->xs_fname; |
| blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); |
| set_uuid(probe->dev, xs->xs_uuid, 0); |
| return 0; |
| } |
| |
| static int probe_reiserfs(struct blkid_probe *probe, |
| struct blkid_magic *id, unsigned char *buf) |
| { |
| struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; |
| unsigned int blocksize; |
| const char *label = 0; |
| |
| blocksize = blkid_le16(rs->rs_blocksize); |
| |
| /* If the superblock is inside the journal, we have the wrong one */ |
| if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) |
| return -BLKID_ERR_BIG; |
| |
| /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ |
| if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { |
| if (strlen(rs->rs_label)) |
| label = rs->rs_label; |
| set_uuid(probe->dev, rs->rs_uuid, 0); |
| } |
| blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); |
| |
| return 0; |
| } |
| |
| static int probe_reiserfs4(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; |
| const unsigned char *label = 0; |
| |
| if (strlen((char *) rs4->rs4_label)) |
| label = rs4->rs4_label; |
| set_uuid(probe->dev, rs4->rs4_uuid, 0); |
| blkid_set_tag(probe->dev, "LABEL", (const char *) label, |
| sizeof(rs4->rs4_label)); |
| |
| return 0; |
| } |
| |
| static int probe_jfs(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct jfs_super_block *js; |
| const char *label = 0; |
| |
| js = (struct jfs_super_block *)buf; |
| |
| if (strlen((char *) js->js_label)) |
| label = (char *) js->js_label; |
| blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); |
| set_uuid(probe->dev, js->js_uuid, 0); |
| return 0; |
| } |
| |
| static int probe_romfs(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct romfs_super_block *ros; |
| const char *label = 0; |
| |
| ros = (struct romfs_super_block *)buf; |
| |
| if (strlen((char *) ros->ros_volume)) |
| label = (char *) ros->ros_volume; |
| blkid_set_tag(probe->dev, "LABEL", label, 0); |
| return 0; |
| } |
| |
| static int probe_cramfs(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct cramfs_super_block *csb; |
| const char *label = 0; |
| |
| csb = (struct cramfs_super_block *)buf; |
| |
| if (strlen((char *) csb->name)) |
| label = (char *) csb->name; |
| blkid_set_tag(probe->dev, "LABEL", label, 0); |
| return 0; |
| } |
| |
| static int probe_swap0(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf __BLKID_ATTR((unused))) |
| { |
| blkid_set_tag(probe->dev, "UUID", 0, 0); |
| blkid_set_tag(probe->dev, "LABEL", 0, 0); |
| return 0; |
| } |
| |
| static int probe_swap1(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf __BLKID_ATTR((unused))) |
| { |
| struct swap_id_block *sws; |
| |
| probe_swap0(probe, id, buf); |
| /* |
| * Version 1 swap headers are always located at offset of 1024 |
| * bytes, although the swap signature itself is located at the |
| * end of the page (which may vary depending on hardware |
| * pagesize). |
| */ |
| sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); |
| if (!sws) |
| return 1; |
| |
| /* arbitrary sanity check.. is there any garbage down there? */ |
| if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { |
| if (sws->sws_volume[0]) |
| blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, |
| sizeof(sws->sws_volume)); |
| if (sws->sws_uuid[0]) |
| set_uuid(probe->dev, sws->sws_uuid, 0); |
| } |
| return 0; |
| } |
| |
| static int probe_iso9660(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct iso_volume_descriptor *iso; |
| const unsigned char *label; |
| |
| iso = (struct iso_volume_descriptor *) buf; |
| label = iso->volume_id; |
| |
| blkid_set_tag(probe->dev, "LABEL", (const char *) label, |
| figure_label_len(label, 32)); |
| return 0; |
| } |
| |
| |
| static const char |
| *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", |
| "NSR03", "TEA01", 0 }; |
| |
| static int probe_udf(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf __BLKID_ATTR((unused))) |
| { |
| int j, bs; |
| struct iso_volume_descriptor *isosb; |
| const char ** m; |
| |
| /* determine the block size by scanning in 2K increments |
| (block sizes larger than 2K will be null padded) */ |
| for (bs = 1; bs < 16; bs++) { |
| isosb = (struct iso_volume_descriptor *) |
| get_buffer(probe, bs*2048+32768, sizeof(isosb)); |
| if (!isosb) |
| return 1; |
| if (isosb->vd_id[0]) |
| break; |
| } |
| |
| /* Scan up to another 64 blocks looking for additional VSD's */ |
| for (j = 1; j < 64; j++) { |
| if (j > 1) { |
| isosb = (struct iso_volume_descriptor *) |
| get_buffer(probe, j*bs*2048+32768, |
| sizeof(isosb)); |
| if (!isosb) |
| return 1; |
| } |
| /* If we find NSR0x then call it udf: |
| NSR01 for UDF 1.00 |
| NSR02 for UDF 1.50 |
| NSR03 for UDF 2.00 */ |
| if (!memcmp(isosb->vd_id, "NSR0", 4)) |
| return 0; |
| for (m = udf_magic; *m; m++) |
| if (!memcmp(*m, isosb->vd_id, 5)) |
| break; |
| if (*m == 0) |
| return 1; |
| } |
| return 1; |
| } |
| |
| static int probe_ocfs(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct ocfs_volume_header ovh; |
| struct ocfs_volume_label ovl; |
| __u32 major; |
| |
| memcpy(&ovh, buf, sizeof(ovh)); |
| memcpy(&ovl, buf+512, sizeof(ovl)); |
| |
| major = ocfsmajor(ovh); |
| if (major == 1) |
| blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); |
| else if (major >= 9) |
| blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); |
| |
| blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); |
| blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); |
| set_uuid(probe->dev, ovl.vol_id, 0); |
| return 0; |
| } |
| |
| static int probe_ocfs2(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct ocfs2_super_block *osb; |
| |
| osb = (struct ocfs2_super_block *)buf; |
| |
| blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); |
| set_uuid(probe->dev, osb->s_uuid, 0); |
| return 0; |
| } |
| |
| static int probe_oracleasm(struct blkid_probe *probe, |
| struct blkid_magic *id __BLKID_ATTR((unused)), |
| unsigned char *buf) |
| { |
| struct oracle_asm_disk_label *dl; |
| |
| dl = (struct oracle_asm_disk_label *)buf; |
| |
| blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); |
| return 0; |
| } |
| |
| /* |
| * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined |
| * in the type_array table below + bim_kbalign. |
| * |
| * When probing for a lot of magics, we handle everything in 1kB buffers so |
| * that we don't have to worry about reading each combination of block sizes. |
| */ |
| #define BLKID_BLK_OFFS 64 /* currently reiserfs */ |
| |
| /* |
| * Various filesystem magics that we can check for. Note that kboff and |
| * sboff are in kilobytes and bytes respectively. All magics are in |
| * byte strings so we don't worry about endian issues. |
| */ |
| static struct blkid_magic type_array[] = { |
| /* type kboff sboff len magic probe */ |
| { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, |
| { "ntfs", 0, 3, 8, "NTFS ", 0 }, |
| { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, |
| { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, |
| { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, |
| { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, |
| { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, |
| { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, |
| { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, |
| { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, |
| { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, |
| { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, |
| { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, |
| { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, |
| { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, |
| { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, |
| { "vfat", 0, 0, 2, "\353\220", probe_fat_nomagic }, |
| { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, |
| { "minix", 1, 0x10, 2, "\177\023", 0 }, |
| { "minix", 1, 0x10, 2, "\217\023", 0 }, |
| { "minix", 1, 0x10, 2, "\150\044", 0 }, |
| { "minix", 1, 0x10, 2, "\170\044", 0 }, |
| { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, |
| { "xfs", 0, 0, 4, "XFSB", probe_xfs }, |
| { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, |
| { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, |
| { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, |
| { "qnx4", 0, 4, 6, "QNX4FS", 0 }, |
| { "udf", 32, 1, 5, "BEA01", probe_udf }, |
| { "udf", 32, 1, 5, "BOOT2", probe_udf }, |
| { "udf", 32, 1, 5, "CD001", probe_udf }, |
| { "udf", 32, 1, 5, "CDW02", probe_udf }, |
| { "udf", 32, 1, 5, "NSR02", probe_udf }, |
| { "udf", 32, 1, 5, "NSR03", probe_udf }, |
| { "udf", 32, 1, 5, "TEA01", probe_udf }, |
| { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, |
| { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, |
| { "jfs", 32, 0, 4, "JFS1", probe_jfs }, |
| { "hfs", 1, 0, 2, "BD", 0 }, |
| { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, |
| { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, |
| { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, |
| { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, |
| { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, |
| { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, |
| { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, |
| { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, |
| { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, |
| { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, |
| { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, |
| { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, |
| { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, |
| { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, |
| { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, |
| { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, |
| { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, |
| { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, |
| { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, |
| { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, |
| { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, |
| { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, |
| { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, |
| { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, |
| { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, |
| { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, |
| { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, |
| { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, |
| { NULL, 0, 0, 0, NULL, NULL } |
| }; |
| |
| /* |
| * Verify that the data in dev is consistent with what is on the actual |
| * block device (using the devname field only). Normally this will be |
| * called when finding items in the cache, but for long running processes |
| * is also desirable to revalidate an item before use. |
| * |
| * If we are unable to revalidate the data, we return the old data and |
| * do not set the BLKID_BID_FL_VERIFIED flag on it. |
| */ |
| blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) |
| { |
| struct blkid_magic *id; |
| struct blkid_probe probe; |
| blkid_tag_iterate iter; |
| unsigned char *buf; |
| const char *type, *value; |
| struct stat st; |
| time_t diff, now; |
| int idx; |
| |
| if (!dev) |
| return NULL; |
| |
| now = time(0); |
| diff = now - dev->bid_time; |
| |
| if ((now > dev->bid_time) && (diff > 0) && |
| ((diff < BLKID_PROBE_MIN) || |
| (dev->bid_flags & BLKID_BID_FL_VERIFIED && |
| diff < BLKID_PROBE_INTERVAL))) |
| return dev; |
| |
| DBG(DEBUG_PROBE, |
| printf("need to revalidate %s (time since last check %llu)\n", |
| dev->bid_name, (unsigned long long)diff)); |
| |
| if (((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) || |
| (fstat(probe.fd, &st) < 0)) { |
| if (probe.fd >= 0) close(probe.fd); |
| if (errno == ENXIO || errno == ENODEV || errno == ENOENT) { |
| blkid_free_dev(dev); |
| return NULL; |
| } |
| /* We don't have read permission, just return cache data. */ |
| DBG(DEBUG_PROBE, |
| printf("returning unverified data for %s\n", |
| dev->bid_name)); |
| return dev; |
| } |
| |
| probe.cache = cache; |
| probe.dev = dev; |
| probe.sbbuf = 0; |
| probe.buf = 0; |
| probe.buf_max = 0; |
| |
| /* |
| * Iterate over the type array. If we already know the type, |
| * then try that first. If it doesn't work, then blow away |
| * the type information, and try again. |
| * |
| */ |
| try_again: |
| type = 0; |
| if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { |
| uuid_t uuid; |
| |
| if (check_mdraid(probe.fd, uuid) == 0) { |
| set_uuid(dev, uuid, 0); |
| type = "mdraid"; |
| goto found_type; |
| } |
| } |
| for (id = type_array; id->bim_type; id++) { |
| if (dev->bid_type && |
| strcmp(id->bim_type, dev->bid_type)) |
| continue; |
| |
| idx = id->bim_kboff + (id->bim_sboff >> 10); |
| buf = get_buffer(&probe, idx << 10, 1024); |
| if (!buf) |
| continue; |
| |
| if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff), |
| id->bim_len)) |
| continue; |
| |
| if ((id->bim_probe == NULL) || |
| (id->bim_probe(&probe, id, buf) == 0)) { |
| type = id->bim_type; |
| goto found_type; |
| } |
| } |
| |
| if (!id->bim_type && dev->bid_type) { |
| /* |
| * Zap the device filesystem information and try again |
| */ |
| iter = blkid_tag_iterate_begin(dev); |
| while (blkid_tag_next(iter, &type, &value) == 0) |
| blkid_set_tag(dev, type, 0, 0); |
| blkid_tag_iterate_end(iter); |
| goto try_again; |
| } |
| |
| if (!dev->bid_type) { |
| if (probe.fd >= 0) close(probe.fd); |
| blkid_free_dev(dev); |
| return NULL; |
| } |
| |
| found_type: |
| if (dev && type) { |
| dev->bid_devno = st.st_rdev; |
| dev->bid_time = time(0); |
| dev->bid_flags |= BLKID_BID_FL_VERIFIED; |
| cache->bic_flags |= BLKID_BIC_FL_CHANGED; |
| |
| blkid_set_tag(dev, "TYPE", type, 0); |
| |
| DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", |
| dev->bid_name, (long long)st.st_rdev, type)); |
| } |
| |
| if (probe.sbbuf) |
| free(probe.sbbuf); |
| if (probe.buf) |
| free(probe.buf); |
| close(probe.fd); |
| |
| return dev; |
| } |
| |
| int blkid_known_fstype(const char *fstype) |
| { |
| struct blkid_magic *id; |
| |
| for (id = type_array; id->bim_type; id++) { |
| if (strcmp(fstype, id->bim_type) == 0) |
| return 1; |
| } |
| return 0; |
| } |
| |
| #ifdef TEST_PROGRAM |
| int main(int argc, char **argv) |
| { |
| blkid_dev dev; |
| blkid_cache cache; |
| int ret; |
| |
| if (argc != 2) { |
| fprintf(stderr, "Usage: %s device\n" |
| "Probe a single device to determine type\n", argv[0]); |
| exit(1); |
| } |
| if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { |
| fprintf(stderr, "%s: error creating cache (%d)\n", |
| argv[0], ret); |
| exit(1); |
| } |
| dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); |
| if (!dev) { |
| printf("%s: %s has an unsupported type\n", argv[0], argv[1]); |
| return (1); |
| } |
| printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); |
| if (dev->bid_label) |
| printf("LABEL='%s'\n", dev->bid_label); |
| if (dev->bid_uuid) |
| printf("UUID='%s'\n", dev->bid_uuid); |
| |
| blkid_free_dev(dev); |
| return (0); |
| } |
| #endif |