static void
g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
char *sector, *volume;
int i;
g_topology_assert_not();
pp = cp->provider;
label[0] = '\0';
if ((ISO9660_OFFSET % pp->sectorsize) != 0)
return;
sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize,
NULL);
if (sector == NULL)
return;
if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
g_free(sector);
return;
}
G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
volume = sector + 0x28;
bzero(label, size);
strlcpy(label, volume, MIN(size, VOLUME_LEN));
g_free(sector);
for (i = size - 1; i > 0; i--) {
if (label[i] == '\0')
continue;
else if (label[i] == ' ')
label[i] = '\0';
else
break;
}
}
static void
g_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
e2sb_t *fs;
char *s_volume_name;
g_topology_assert_not();
pp = cp->provider;
label[0] = '\0';
if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
return;
fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
if (fs == NULL)
return;
/* Check for magic and versio n*/
if (fs->s_magic == EXT2_SUPER_MAGIC &&
fs->s_rev_level == EXT2_DYNAMIC_REV) {
G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
pp->name);
} else {
goto exit_free;
}
s_volume_name = fs->s_volume_name;
/* Terminate label */
s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
if (s_volume_name[0] == '/')
s_volume_name += 1;
/* Check for volume label */
if (s_volume_name[0] == '\0')
goto exit_free;
strlcpy(label, s_volume_name, size);
exit_free:
g_free(fs);
}
static void
g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
reiserfs_sb_t *fs;
g_topology_assert_not();
pp = cp->provider;
label[0] = '\0';
/* Try old format */
fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET);
if (fs == NULL) {
/* Try new format */
fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET);
}
if (fs == NULL)
return;
/* Check version */
if (fs->s_version == 2) {
G_LABEL_DEBUG(1, "reiserfs file system detected on %s.",
pp->name);
} else {
goto exit_free;
}
/* Check for volume label */
if (fs->s_volume_name[0] == '\0')
goto exit_free;
/* Terminate label */
fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
strlcpy(label, fs->s_volume_name, size);
exit_free:
g_free(fs);
}
static void
g_label_msdosfs_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
FAT_BSBPB *pfat_bsbpb;
FAT32_BSBPB *pfat32_bsbpb;
FAT_DES *pfat_entry;
uint8_t *sector0, *sector;
g_topology_assert_not();
pp = cp->provider;
sector0 = NULL;
sector = NULL;
bzero(label, size);
/* Check if the sector size of the medium is a valid FAT sector size. */
switch(pp->sectorsize) {
case 512:
case 1024:
case 2048:
case 4096:
break;
default:
G_LABEL_DEBUG(1, "MSDOSFS: %s: sector size %d not compatible.",
pp->name, pp->sectorsize);
return;
}
/* Load 1st sector with boot sector and boot parameter block. */
sector0 = (uint8_t *)g_read_data(cp, 0, pp->sectorsize, NULL);
if (sector0 == NULL)
return;
/* Check for the FAT boot sector signature. */
if (sector0[510] != 0x55 || sector0[511] != 0xaa) {
G_LABEL_DEBUG(1, "MSDOSFS: %s: no FAT signature found.",
pp->name);
goto error;
}
/*
* Test if this is really a FAT volume and determine the FAT type.
*/
pfat_bsbpb = (FAT_BSBPB *)sector0;
pfat32_bsbpb = (FAT32_BSBPB *)sector0;
if (UINT16BYTES(pfat_bsbpb->BPB_FATSz16) != 0) {
/*
* If the BPB_FATSz16 field is not zero and the string "FAT" is
* at the right place, this should be a FAT12 or FAT16 volume.
*/
if (strncmp(pfat_bsbpb->BS_FilSysType, "FAT", 3) != 0) {
G_LABEL_DEBUG(1,
"MSDOSFS: %s: FAT12/16 volume not valid.",
pp->name);
goto error;
}
G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT12/FAT16 volume detected.",
pp->name);
/* A volume with no name should have "NO NAME " as label. */
if (strncmp(pfat_bsbpb->BS_VolLab, LABEL_NO_NAME,
sizeof(pfat_bsbpb->BS_VolLab)) == 0) {
G_LABEL_DEBUG(1,
"MSDOSFS: %s: FAT12/16 volume has no name.",
pp->name);
goto error;
}
strlcpy(label, pfat_bsbpb->BS_VolLab,
MIN(size, sizeof(pfat_bsbpb->BS_VolLab) + 1));
} else if (UINT32BYTES(pfat32_bsbpb->BPB_FATSz32) != 0) {
uint32_t fat_FirstDataSector, fat_BytesPerSector, offset;
/*
* If the BPB_FATSz32 field is not zero and the string "FAT" is
* at the right place, this should be a FAT32 volume.
*/
if (strncmp(pfat32_bsbpb->BS_FilSysType, "FAT", 3) != 0) {
G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT32 volume not valid.",
pp->name);
goto error;
}
G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT32 volume detected.",
pp->name);
/*
* If the volume label is not "NO NAME " we're done.
*/
if (strncmp(pfat32_bsbpb->BS_VolLab, LABEL_NO_NAME,
sizeof(pfat32_bsbpb->BS_VolLab)) != 0) {
strlcpy(label, pfat32_bsbpb->BS_VolLab,
MIN(size, sizeof(pfat32_bsbpb->BS_VolLab) + 1));
goto endofchecks;
}
/*
* If the volume label "NO NAME " is in the boot sector, the
* label of FAT32 volumes may be stored as a special entry in
* the root directory.
*/
fat_FirstDataSector =
UINT16BYTES(pfat32_bsbpb->BPB_RsvdSecCnt) +
(pfat32_bsbpb->BPB_NumFATs *
UINT32BYTES(pfat32_bsbpb->BPB_FATSz32));
fat_BytesPerSector = UINT16BYTES(pfat32_bsbpb->BPB_BytsPerSec);
G_LABEL_DEBUG(2,
"MSDOSFS: FAT_FirstDataSector=0x%x, FAT_BytesPerSector=%d",
fat_FirstDataSector, fat_BytesPerSector);
for (offset = fat_BytesPerSector * fat_FirstDataSector;;
offset += fat_BytesPerSector) {
sector = (uint8_t *)g_read_data(cp, offset,
fat_BytesPerSector, NULL);
if (sector == NULL)
goto error;
pfat_entry = (FAT_DES *)sector;
do {
/* No more entries available. */
if (pfat_entry->DIR_Name[0] == 0) {
G_LABEL_DEBUG(1, "MSDOSFS: %s: "
"FAT32 volume has no name.",
pp->name);
goto error;
}
/* Skip empty or long name entries. */
if (pfat_entry->DIR_Name[0] == 0xe5 ||
(pfat_entry->DIR_Attr &
FAT_DES_ATTR_LONG_NAME) ==
FAT_DES_ATTR_LONG_NAME) {
continue;
}
/*
* The name of the entry is the volume label if
* ATTR_VOLUME_ID is set.
*/
if (pfat_entry->DIR_Attr &
FAT_DES_ATTR_VOLUME_ID) {
strlcpy(label, pfat_entry->DIR_Name,
MIN(size,
sizeof(pfat_entry->DIR_Name) + 1));
goto endofchecks;
}
} while((uint8_t *)(++pfat_entry) <
(uint8_t *)(sector + fat_BytesPerSector));
g_free(sector);
}
} else {
G_LABEL_DEBUG(1, "MSDOSFS: %s: no FAT volume detected.",
pp->name);
goto error;
}
endofchecks:
g_label_rtrim(label, size);
error:
if (sector0 != NULL)
g_free(sector0);
if (sector != NULL)
g_free(sector);
}
static void
g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what)
{
struct g_provider *pp;
int sb, superblock;
struct fs *fs;
g_topology_assert_not();
pp = cp->provider;
label[0] = '\0';
if (SBLOCKSIZE % cp->provider->sectorsize != 0)
return;
/*
* Walk through the standard places that superblocks hide and look
* for UFS magic. If we find magic, then check that the size in the
* superblock corresponds to the size of the underlying provider.
* Finally, look for a volume label and create an appropriate
* provider based on that.
*/
for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
/*
* Take care not to issue an invalid I/O request. The offset of
* the superblock candidate must be multiples of the provider's
* sector size, otherwise an FFS can't exist on the provider
* anyway.
*/
if (superblock % cp->provider->sectorsize != 0)
continue;
fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE, NULL);
if (fs == NULL)
continue;
/* Check for magic */
if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) {
/* Valid UFS1. */
} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) {
/* Valid UFS2. */
} else {
g_free(fs);
continue;
}
if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 ||
fs->fs_bsize < MINBSIZE ||
fs->fs_bsize < sizeof(struct fs)) {
g_free(fs);
continue;
}
G_LABEL_DEBUG(1, "%s file system detected on %s.",
fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name);
switch (what) {
case G_LABEL_UFS_VOLUME:
/* Check for volume label */
if (fs->fs_volname[0] == '\0') {
g_free(fs);
continue;
}
strlcpy(label, fs->fs_volname, size);
break;
case G_LABEL_UFS_ID:
if (fs->fs_id[0] == 0 && fs->fs_id[1] == 0) {
g_free(fs);
continue;
}
snprintf(label, size, "%08x%08x", fs->fs_id[0],
fs->fs_id[1]);
break;
}
g_free(fs);
break;
}
}
