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lib/blkid/probe.c
1 841 строка
51 KB
Eric Biggers
lib/blkid: fix unaligned access to hfs_mdb
27 янв 2023, 20:33
27 янв 2023, 20:33
ae92b8f
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/* * 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 "config.h" #include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h> #include <unistd.h> #include <fcntl.h> #include <ctype.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 __linux__ #include <sys/utsname.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 >= label && (*end == ' ' || *end == 0)) --end; if (end >= label) return end - label + 1; return 0; } static unsigned char *get_buffer(struct blkid_probe *pr, blkid_loff_t 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 (blkid_llseek(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) && memcmp("\374N+\251", 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 + 4, &md->set_uuid1, 12); } return 0; } static void set_uuid(blkid_dev dev, uuid_t uuid, const 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, struct blkid_magic *id, 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 (es->s_volume_name[0]) label = es->s_volume_name; blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); set_uuid(dev, es->s_uuid, 0); if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && !uuid_is_null(es->s_journal_uuid)) set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL"); if (strcmp(id->bim_type, "ext2") && ((blkid_le32(es->s_feature_incompat) & EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0)) blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); } /* * Check to see if a filesystem is in /proc/filesystems. * Returns 1 if found, 0 if not */ static int fs_proc_check(const char *fs_name) { FILE *f; char buf[80], *cp, *t; f = fopen("/proc/filesystems", "r"); if (!f) return (0); while (!feof(f)) { if (!fgets(buf, sizeof(buf), f)) break; cp = buf; if (!isspace(*cp)) { while (*cp && !isspace(*cp)) cp++; } while (*cp && isspace(*cp)) cp++; if ((t = strchr(cp, '\n')) != NULL) *t = 0; if ((t = strchr(cp, '\t')) != NULL) *t = 0; if ((t = strchr(cp, ' ')) != NULL) *t = 0; if (!strcmp(fs_name, cp)) { fclose(f); return (1); } } fclose(f); return (0); } /* * Check to see if a filesystem is available as a module * Returns 1 if found, 0 if not */ static int check_for_modules(const char *fs_name) { #ifdef __linux__ struct utsname uts; FILE *f; char buf[1024], *cp; int namesz; if (uname(&uts)) return (0); snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release); f = fopen(buf, "r"); if (!f) return (0); namesz = strlen(fs_name); while (!feof(f)) { if (!fgets(buf, sizeof(buf), f)) break; if ((cp = strchr(buf, ':')) != NULL) *cp = 0; else continue; if ((cp = strrchr(buf, '/')) != NULL) cp++; else cp = buf; if (!strncmp(cp, fs_name, namesz) && (!strcmp(cp + namesz, ".ko") || !strcmp(cp + namesz, ".ko.gz"))) { fclose(f); return (1); } } fclose(f); #endif return (0); } static int linux_version_code(void) { #ifdef __linux__ struct utsname ut; static int version_code = -1; int major, minor, rev; char *endptr; const char *cp; if (version_code > 0) return version_code; if (uname(&ut)) return 0; cp = ut.release; major = strtol(cp, &endptr, 10); if (cp == endptr || *endptr != '.') return 0; cp = endptr + 1; minor = strtol(cp, &endptr, 10); if (cp == endptr || *endptr != '.') return 0; cp = endptr + 1; rev = strtol(cp, &endptr, 10); if (cp == endptr) return 0; version_code = (((major * 256) + minor) * 256) + rev; return version_code; #else return 0; #endif } #define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29) static int system_supports_ext2(void) { static time_t last_check = 0; static int ret = -1; time_t now = time(0); if (ret != -1 || (now - last_check) < 5) return ret; last_check = now; ret = (fs_proc_check("ext2") || check_for_modules("ext2")); return ret; } static int system_supports_ext4(void) { static time_t last_check = 0; static int ret = -1; time_t now = time(0); if (ret != -1 || (now - last_check) < 5) return ret; last_check = now; ret = (fs_proc_check("ext4") || check_for_modules("ext4")); return ret; } static int system_supports_ext4dev(void) { static time_t last_check = 0; static int ret = -1; time_t now = time(0); if (ret != -1 || (now - last_check) < 5) return ret; last_check = now; ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev")); return ret; } static int probe_ext4dev(struct blkid_probe *probe, struct blkid_magic *id, unsigned char *buf) { struct ext2_super_block *es; es = (struct ext2_super_block *)buf; /* Distinguish from jbd */ if (blkid_le32(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) return -BLKID_ERR_PARAM; /* * If the filesystem does not have a journal and ext2 and ext4 * is not present, then force this to be detected as an * ext4dev filesystem. */ if (!(blkid_le32(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && !system_supports_ext2() && !system_supports_ext4() && system_supports_ext4dev() && linux_version_code() >= EXT4_SUPPORTS_EXT2) goto force_ext4dev; /* * If the filesystem is marked as OK for use by in-development * filesystem code, but ext4dev is not supported, and ext4 is, * then don't call ourselves ext4dev, since we should be * detected as ext4 in that case. * * If the filesystem is marked as in use by production * filesystem, then it can only be used by ext4 and NOT by * ext4dev, so always disclaim we are ext4dev in that case. */ if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { if (!system_supports_ext4dev() && system_supports_ext4()) return -BLKID_ERR_PARAM; } else return -BLKID_ERR_PARAM; force_ext4dev: get_ext2_info(probe->dev, id, buf); return 0; } static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id, unsigned char *buf) { struct ext2_super_block *es; es = (struct ext2_super_block *)buf; /* Distinguish from jbd */ if (blkid_le32(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) return -BLKID_ERR_PARAM; /* * If the filesystem does not have a journal and ext2 is not * present, then force this to be detected as an ext2 * filesystem. */ if (!(blkid_le32(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && !system_supports_ext2() && system_supports_ext4() && linux_version_code() >= EXT4_SUPPORTS_EXT2) goto force_ext4; /* Ext4 has at least one feature which ext3 doesn't understand */ if (!(blkid_le32(es->s_feature_ro_compat) & EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) && !(blkid_le32(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) return -BLKID_ERR_PARAM; force_ext4: /* * If the filesystem is a OK for use by in-development * filesystem code, and ext4dev is supported or ext4 is not * supported, then don't call ourselves ext4, so we can redo * the detection and mark the filesystem as ext4dev. * * If the filesystem is marked as in use by production * filesystem, then it can only be used by ext4 and NOT by * ext4dev. */ if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { if (system_supports_ext4dev() || !system_supports_ext4()) return -BLKID_ERR_PARAM; } get_ext2_info(probe->dev, id, buf); return 0; } static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id, unsigned char *buf) { struct ext2_super_block *es; es = (struct ext2_super_block *)buf; /* ext3 requires journal */ if (!(blkid_le32(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) return -BLKID_ERR_PARAM; /* Any features which ext3 doesn't understand */ if ((blkid_le32(es->s_feature_ro_compat) & EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) || (blkid_le32(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) return -BLKID_ERR_PARAM; get_ext2_info(probe->dev, id, buf); return 0; } static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id, unsigned char *buf) { struct ext2_super_block *es; es = (struct ext2_super_block *)buf; /* Distinguish between ext3 and ext2 */ if ((blkid_le32(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) return -BLKID_ERR_PARAM; /* Any features which ext2 doesn't understand */ if ((blkid_le32(es->s_feature_ro_compat) & EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) || (blkid_le32(es->s_feature_incompat) & EXT2_FEATURE_INCOMPAT_UNSUPPORTED)) return -BLKID_ERR_PARAM; /* * If ext2 is not present, but ext4 or ext4dev are, then * disclaim we are ext2 */ if (!system_supports_ext2() && (system_supports_ext4() || system_supports_ext4dev()) && linux_version_code() >= EXT4_SUPPORTS_EXT2) return -BLKID_ERR_PARAM; get_ext2_info(probe->dev, id, buf); return 0; } static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id, 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, id, 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 const 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 = (unsigned char *)&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 = (unsigned char *)&ms->ms_dir_entries; dir_entries = tmp[0] + (tmp[1] << 8); reserved = blkid_le16(ms->ms_reserved); tmp = (unsigned char *)&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); if (ms->ms_cluster_size == 0) return 1; 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 = (__u64) (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 = ((unsigned int) reserved * (unsigned int) 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)) { if ((label_len = figure_label_len(vol_label, 11))) label = vol_label; } /* 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 msdos_super_block *ms; ms = (struct msdos_super_block *)buf; /* heads check */ if (ms->ms_heads == 0) return 1; /* cluster size check*/ if (ms->ms_cluster_size == 0 || (ms->ms_cluster_size & (ms->ms_cluster_size-1))) return 1; /* media check */ if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0) return 1; /* fat counts(Linux kernel expects at least 1 FAT table) */ if (!ms->ms_fats) return 1; /* * OS/2 and apparently DFSee will place a FAT12/16-like * pseudo-superblock in the first 512 bytes of non-FAT * filesystems --- at least JFS and HPFS, and possibly others. * So we explicitly check for those filesystems at the * FAT12/16 filesystem magic field identifier, and if they are * present, we rule this out as a FAT filesystem, despite the * FAT-like pseudo-header. */ if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) || (memcmp(ms->ms_magic, "HPFS ", 8) == 0)) return 1; return probe_fat(probe, id, buf); } static int probe_ntfs(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct ntfs_super_block *ns; struct master_file_table_record *mft; struct file_attribute *attr; char uuid_str[17], label_str[129], *cp; int bytes_per_sector, sectors_per_cluster; int mft_record_size, attr_off, attr_len; unsigned int i, attr_type, val_len; int val_off; __u64 nr_clusters; blkid_loff_t off; unsigned char *buf_mft, *val; ns = (struct ntfs_super_block *) buf; bytes_per_sector = ns->bios_parameter_block[0] + (ns->bios_parameter_block[1] << 8); sectors_per_cluster = ns->bios_parameter_block[2]; if ((bytes_per_sector < 512) || (sectors_per_cluster == 0)) return 1; if (ns->cluster_per_mft_record < 0) mft_record_size = 1 << (0-ns->cluster_per_mft_record); else mft_record_size = ns->cluster_per_mft_record * sectors_per_cluster * bytes_per_sector; nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster; if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) || (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters)) return 1; off = blkid_le64(ns->mft_mirror_cluster_location) * bytes_per_sector * sectors_per_cluster; buf_mft = get_buffer(probe, off, mft_record_size); if (!buf_mft) return 1; if (memcmp(buf_mft, "FILE", 4)) return 1; off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * sectors_per_cluster; buf_mft = get_buffer(probe, off, mft_record_size); if (!buf_mft) return 1; if (memcmp(buf_mft, "FILE", 4)) return 1; off += MFT_RECORD_VOLUME * mft_record_size; buf_mft = get_buffer(probe, off, mft_record_size); if (!buf_mft) return 1; if (memcmp(buf_mft, "FILE", 4)) return 1; mft = (struct master_file_table_record *) buf_mft; attr_off = blkid_le16(mft->attrs_offset); label_str[0] = 0; while (1) { attr = (struct file_attribute *) (buf_mft + attr_off); attr_len = blkid_le16(attr->len); attr_type = blkid_le32(attr->type); val_off = blkid_le16(attr->value_offset); val_len = blkid_le32(attr->value_len); attr_off += attr_len; if ((attr_off > mft_record_size) || (attr_len == 0)) break; if (attr_type == MFT_RECORD_ATTR_END) break; if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { if (val_len > sizeof(label_str)) val_len = sizeof(label_str)-1; for (i=0, cp=label_str; i < val_len; i+=2,cp++) { val = ((__u8 *) attr) + val_off + i; *cp = val[0]; if (val[1]) *cp = '?'; } *cp = 0; } } sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial)); blkid_set_tag(probe->dev, "UUID", uuid_str, 0); if (label_str[0]) blkid_set_tag(probe->dev, "LABEL", label_str, 0); return 0; } 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); /* The blocksize must be at least 1k */ if ((blocksize >> 10) == 0) return -BLKID_ERR_PARAM; /* 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 (blkid_le32(js->js_bsize) != (1U << blkid_le16(js->js_l2bsize))) return 1; if (blkid_le32(js->js_pbsize) != (1U << blkid_le16(js->js_l2pbsize))) return 1; if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) != blkid_le16(js->js_l2bfactor)) return 1; 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_zfs(struct blkid_probe *probe __BLKID_ATTR((unused)), struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf __BLKID_ATTR((unused))) { #if 0 char *vdev_label; const char *pool_name = 0; /* read nvpair data for pool name, pool GUID (complex) */ blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name)); set_uuid(probe->dev, pool_guid, 0); #endif return 0; } static int probe_luks(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { char uuid[41]; /* 168 is the offset to the 40 character uuid: * http://luks.endorphin.org/LUKS-on-disk-format.pdf */ strncpy(uuid, (char *) buf+168, 40); uuid[40] = 0; blkid_set_tag(probe->dev, "UUID", uuid, 40); 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, 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; /* check for wrong version or zeroed pagecount, for sanity */ if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) && (sws->sws_version != 1 || sws->sws_lastpage == 0)) 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, (blkid_loff_t) 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 probe_iso9660(probe, id, buf); 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; } static int probe_gfs(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct gfs2_sb *sbd; const char *label = 0; sbd = (struct gfs2_sb *)buf; if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS && blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) { blkid_set_tag(probe->dev, "UUID", 0, 0); if (strlen(sbd->sb_locktable)) label = sbd->sb_locktable; blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); return 0; } return 1; } static int probe_gfs2(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct gfs2_sb *sbd; const char *label = 0; sbd = (struct gfs2_sb *)buf; if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS && blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) { blkid_set_tag(probe->dev, "UUID", 0, 0); if (strlen(sbd->sb_locktable)) label = sbd->sb_locktable; blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); return 0; } return 1; } static void unicode_16be_to_utf8(unsigned char *str, int out_len, const unsigned char *buf, int in_len) { int i, j; unsigned int c; for (i = j = 0; i + 2 <= in_len; i += 2) { c = (buf[i] << 8) | buf[i+1]; if (c == 0) { str[j] = '\0'; break; } else if (c < 0x80) { if (j+1 >= out_len) break; str[j++] = (unsigned char) c; } else if (c < 0x800) { if (j+2 >= out_len) break; str[j++] = (unsigned char) (0xc0 | (c >> 6)); str[j++] = (unsigned char) (0x80 | (c & 0x3f)); } else { if (j+3 >= out_len) break; str[j++] = (unsigned char) (0xe0 | (c >> 12)); str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f)); str[j++] = (unsigned char) (0x80 | (c & 0x3f)); } } str[j] = '\0'; } static void unicode_16le_to_utf8(unsigned char *str, int out_len, const unsigned char *buf, int in_len) { int i, j; unsigned int c; for (i = j = 0; i + 2 <= in_len; i += 2) { c = (buf[i+1] << 8) | buf[i]; if (c == 0) { str[j] = '\0'; break; } else if (c < 0x80) { if (j+1 >= out_len) break; str[j++] = (unsigned char) c; } else if (c < 0x800) { if (j+2 >= out_len) break; str[j++] = (unsigned char) (0xc0 | (c >> 6)); str[j++] = (unsigned char) (0x80 | (c & 0x3f)); } else { if (j+3 >= out_len) break; str[j++] = (unsigned char) (0xe0 | (c >> 12)); str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f)); str[j++] = (unsigned char) (0x80 | (c & 0x3f)); } } str[j] = '\0'; } static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)), struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct hfs_mdb *hfs = (struct hfs_mdb *)buf; char uuid_str[17]; __u64 uuid; if ((memcmp(hfs->embed_sig, "H+", 2) == 0) || (memcmp(hfs->embed_sig, "HX", 2) == 0)) return 1; /* Not hfs, but an embedded HFS+ */ memcpy(&uuid, hfs->finder_info.id, 8); uuid = blkid_le64(uuid); if (uuid) { sprintf(uuid_str, "%016llX", uuid); blkid_set_tag(probe->dev, "UUID", uuid_str, 0); } blkid_set_tag(probe->dev, "LABEL", (char *)hfs->label, hfs->label_len); return 0; } #define HFSPLUS_SECTOR_SIZE 512 static int probe_hfsplus(struct blkid_probe *probe, struct blkid_magic *id, unsigned char *buf) { struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; struct hfsplus_bnode_descriptor *descr; struct hfsplus_bheader_record *bnode; struct hfsplus_catalog_key *key; struct hfsplus_vol_header *hfsplus; struct hfs_mdb *sbd = (struct hfs_mdb *) buf; unsigned int alloc_block_size; unsigned int alloc_first_block; unsigned int embed_first_block; unsigned int off = 0; unsigned int blocksize; unsigned int cat_block; unsigned int ext_block_start; unsigned int ext_block_count; unsigned int record_count; unsigned int leaf_node_head; unsigned int leaf_node_count; unsigned int leaf_node_size; unsigned int leaf_block; unsigned int label_len; __u64 leaf_off, uuid; char uuid_str[17], label[512]; int ext; /* Check for a HFS+ volume embedded in a HFS volume */ if (memcmp(sbd->signature, "BD", 2) == 0) { if ((memcmp(sbd->embed_sig, "H+", 2) != 0) && (memcmp(sbd->embed_sig, "HX", 2) != 0)) /* This must be an HFS volume, so fail */ return 1; alloc_block_size = blkid_be32(sbd->al_blk_size); alloc_first_block = blkid_be16(sbd->al_bl_st); embed_first_block = blkid_be16(sbd->embed_startblock); off = (alloc_first_block * 512) + (embed_first_block * alloc_block_size); buf = get_buffer(probe, off + (id->bim_kboff * 1024), sizeof(*sbd)); if (!buf) return 1; hfsplus = (struct hfsplus_vol_header *) buf; } hfsplus = (struct hfsplus_vol_header *) buf; if ((memcmp(hfsplus->signature, "H+", 2) != 0) && (memcmp(hfsplus->signature, "HX", 2) != 0)) return 1; memcpy(&uuid, hfsplus->finder_info.id, 8); uuid = blkid_le64(uuid); if (uuid) { sprintf(uuid_str, "%016llX", uuid); blkid_set_tag(probe->dev, "UUID", uuid_str, 0); } blocksize = blkid_be32(hfsplus->blocksize); if (blocksize < HFSPLUS_SECTOR_SIZE) return 1; memcpy(extents, hfsplus->cat_file.extents, sizeof(extents)); cat_block = blkid_be32(extents[0].start_block); buf = get_buffer(probe, off + ((__u64) cat_block * blocksize), 0x2000); if (!buf) return 0; bnode = (struct hfsplus_bheader_record *) &buf[sizeof(struct hfsplus_bnode_descriptor)]; leaf_node_head = blkid_be32(bnode->leaf_head); leaf_node_size = blkid_be16(bnode->node_size); leaf_node_count = blkid_be32(bnode->leaf_count); if (leaf_node_count == 0) return 0; leaf_block = (leaf_node_head * leaf_node_size) / blocksize; /* get physical location */ for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) { ext_block_start = blkid_be32(extents[ext].start_block); ext_block_count = blkid_be32(extents[ext].block_count); if (ext_block_count == 0) return 0; /* this is our extent */ if (leaf_block < ext_block_count) break; leaf_block -= ext_block_count; } if (ext == HFSPLUS_EXTENT_COUNT) return 0; leaf_off = (__u64) (ext_block_start + leaf_block) * blocksize; buf = get_buffer(probe, off + leaf_off, leaf_node_size); if (!buf) return 0; descr = (struct hfsplus_bnode_descriptor *) buf; record_count = blkid_be16(descr->num_recs); if (record_count == 0) return 0; if (descr->type != HFS_NODE_LEAF) return 0; key = (struct hfsplus_catalog_key *) &buf[sizeof(struct hfsplus_bnode_descriptor)]; if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID) return 0; label_len = blkid_be16(key->unicode_len) * 2; unicode_16be_to_utf8((unsigned char *)label, sizeof(label), key->unicode, label_len); blkid_set_tag(probe->dev, "LABEL", label, 0); return 0; } #define LVM2_LABEL_SIZE 512 static unsigned int lvm2_calc_crc(const void *buf, unsigned int size) { static const unsigned int crctab[] = { 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c }; unsigned int i, crc = 0xf597a6cf; const __u8 *data = (const __u8 *) buf; for (i = 0; i < size; i++) { crc ^= *data++; crc = (crc >> 4) ^ crctab[crc & 0xf]; crc = (crc >> 4) ^ crctab[crc & 0xf]; } return crc; } static int probe_lvm2(struct blkid_probe *probe, struct blkid_magic *id, unsigned char *buf) { int sector = (id->bim_kboff) << 1; struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf; char *p, *q, uuid[40]; unsigned int i, b; /* buf is at 0k or 1k offset; find label inside */ if (memcmp(buf, "LABELONE", 8) == 0) { label = (struct lvm2_pv_label_header *)buf; } else if (memcmp(buf + 512, "LABELONE", 8) == 0) { label = (struct lvm2_pv_label_header *)(buf + 512); sector++; } else { return 1; } if (blkid_le64(label->sector_xl) != (unsigned) sector) { DBG(DEBUG_PROBE, printf("LVM2: label for sector %llu found at sector %d\n", blkid_le64(label->sector_xl), sector)); return 1; } if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE - ((char *)&label->offset_xl - (char *)label)) != blkid_le32(label->crc_xl)) { DBG(DEBUG_PROBE, printf("LVM2: label checksum incorrect at sector %d\n", sector)); return 1; } for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i < LVM2_ID_LEN; i++, b <<= 1) { if (b & 0x4444440) *p++ = '-'; *p++ = *q++; } blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6); return 0; } static int probe_btrfs(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct btrfs_super_block *bs; const char *label = 0; bs = (struct btrfs_super_block *)buf; if (strlen(bs->label)) label = bs->label; blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label)); set_uuid(probe->dev, bs->fsid, 0); return 0; } static int probe_f2fs(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct f2fs_super_block *bs; bs = (struct f2fs_super_block *)buf; set_uuid(probe->dev, bs->uuid, 0); return 0; } static uint64_t exfat_block_to_offset(const struct exfat_super_block *sb, uint64_t block) { return block << sb->block_bits; } static uint64_t exfat_cluster_to_block(const struct exfat_super_block *sb, uint32_t cluster) { return sb->cluster_block_start + ((uint64_t)(cluster - EXFAT_FIRST_DATA_CLUSTER) << sb->bpc_bits); } static uint64_t exfat_cluster_to_offset(const struct exfat_super_block *sb, uint32_t cluster) { return exfat_block_to_offset(sb, exfat_cluster_to_block(sb, cluster)); } static uint32_t exfat_next_cluster(struct blkid_probe *probe, const struct exfat_super_block *sb, uint32_t cluster) { uint32_t *next; uint64_t offset; offset = exfat_block_to_offset(sb, sb->fat_block_start) + (uint64_t) cluster * sizeof (cluster); next = (uint32_t *)get_buffer(probe, offset, sizeof (uint32_t)); return next ? *next : 0; } static struct exfat_entry_label *find_exfat_entry_label( struct blkid_probe *probe, const struct exfat_super_block *sb) { uint32_t cluster = sb->rootdir_cluster; uint64_t offset = exfat_cluster_to_offset(sb, cluster); uint8_t *entry; const size_t max_iter = 10000; size_t i = 0; for (; i < max_iter; ++i) { entry = (uint8_t *)get_buffer(probe, offset, EXFAT_ENTRY_SIZE); if (!entry) return NULL; if (entry[0] == EXFAT_ENTRY_EOD) return NULL; if (entry[0] == EXFAT_ENTRY_LABEL) return (struct exfat_entry_label*) entry; offset += EXFAT_ENTRY_SIZE; if (offset % CLUSTER_SIZE(sb) == 0) { cluster = exfat_next_cluster(probe, sb, cluster); if (cluster < EXFAT_FIRST_DATA_CLUSTER) return NULL; if (cluster > EXFAT_LAST_DATA_CLUSTER) return NULL; offset = exfat_cluster_to_offset(sb, cluster); } } return NULL; } static int probe_exfat(struct blkid_probe *probe, struct blkid_magic *id __BLKID_ATTR((unused)), unsigned char *buf) { struct exfat_super_block *sb; struct exfat_entry_label *label; char uuid[40]; sb = (struct exfat_super_block *)buf; if (!sb || CLUSTER_SIZE(sb) == 0) { DBG(DEBUG_PROBE, printf("bad exfat superblock.\n")); return errno ? - errno : 1; } label = find_exfat_entry_label(probe, sb); if (label) { unsigned char utf8_label[128]; unicode_16le_to_utf8(utf8_label, sizeof(utf8_label), label->name, label->length * 2); blkid_set_tag(probe->dev, "LABEL", (char *) utf8_label, 0); } else { blkid_set_tag(probe->dev, "LABEL", "disk", 4); } memset(uuid, 0, sizeof (uuid)); snprintf(uuid, sizeof (uuid), "%02hhX%02hhX-%02hhX%02hhX", sb->volume_serial[3], sb->volume_serial[2], sb->volume_serial[1], sb->volume_serial[0]); blkid_set_tag(probe->dev, "UUID", uuid, strlen(uuid)); return 0; } /* * 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 ", probe_ntfs }, { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev }, { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 }, { "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 }, { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 }, { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs }, { "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, 1, "\353", probe_fat_nomagic }, { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, { "vfat", 0, 0x1fe, 2, "\125\252", 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 }, /* ZFS has 128 root blocks (#4 is the first used), check only 6 of them */ { "zfs", 128, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs }, { "zfs", 128, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs }, { "zfs", 132, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs }, { "zfs", 132, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs }, { "zfs", 136, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs }, { "zfs", 136, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs }, { "zfs", 384, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs }, { "zfs", 384, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs }, { "zfs", 388, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs }, { "zfs", 388, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs }, { "zfs", 392, 0, 8, "\0\0\0\0\0\xba\xb1\x0c", probe_zfs }, { "zfs", 392, 0, 8, "\x0c\xb1\xba\0\0\0\0\0", probe_zfs }, { "hfsplus", 1, 0, 2, "BD", probe_hfsplus }, { "hfsplus", 1, 0, 2, "H+", probe_hfsplus }, { "hfsplus", 1, 0, 2, "HX", probe_hfsplus }, { "hfs", 1, 0, 2, "BD", probe_hfs }, { "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 }, { "swsuspend", 0, 0xff6, 9, "ULSUSPEND", 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 }, { "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", 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 }, { "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", 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 }, { "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", 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 }, { "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", 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 }, { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks }, { "squashfs", 0, 0, 4, "sqsh", 0 }, { "squashfs", 0, 0, 4, "hsqs", 0 }, { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 }, { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 }, { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 }, { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 }, { "btrfs", 64, 0x40, 8, "_BHRfS_M", probe_btrfs }, { "f2fs", 1, 0, 4, "\x10\x20\xf5\xf2", probe_f2fs }, { "exfat", 0, 3, 8, "EXFAT ", probe_exfat }, { 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 now; double diff; int idx; if (!dev) return NULL; now = time(0); diff = difftime(now, dev->bid_time); if (stat(dev->bid_name, &st) < 0) { DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while " "trying to stat %s\n", strerror(errno), errno, dev->bid_name)); open_err: if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) { /* 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; } blkid_free_dev(dev); return NULL; } if ((now >= dev->bid_time) && (st.st_mtime <= dev->bid_time) && ((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 (cache time %lu, stat time %lu,\n\t" "time since last check %lu)\n", dev->bid_name, (unsigned long)dev->bid_time, (unsigned long)st.st_mtime, (unsigned long)diff)); if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) { DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while " "opening %s\n", strerror(errno), errno, dev->bid_name)); goto open_err; } 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, (__u64) 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 */ DBG(DEBUG_PROBE, printf("previous fs type %s not valid, " "trying full probe\n", dev->bid_type)); 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) { blkid_free_dev(dev); dev = 0; goto found_type; } 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)); } free(probe.sbbuf); free(probe.buf); if (probe.fd >= 0) 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