/* bsdlabel.c - Read BSD style partition tables. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/partition.h>
#include <grub/bsdlabel.h>
#include <grub/disk.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/dl.h>
#include <grub/msdos_partition.h>
#ifdef GRUB_UTIL
#include <grub/emu/misc.h>
#endif
static struct grub_partition_map grub_bsdlabel_partition_map;
static struct grub_partition_map grub_netbsdlabel_partition_map;
static struct grub_partition_map grub_openbsdlabel_partition_map;
static grub_err_t
iterate_real (grub_disk_t disk, grub_disk_addr_t sector, int freebsd,
struct grub_partition_map *pmap,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
struct grub_partition_bsd_disk_label label;
struct grub_partition p;
grub_disk_addr_t delta = 0;
grub_disk_addr_t pos;
/* Read the BSD label. */
if (grub_disk_read (disk, sector, 0, sizeof (label), &label))
return grub_errno;
/* Check if it is valid. */
if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
/* A kludge to determine a base of be.offset. */
if (GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION
< grub_cpu_to_le16 (label.num_partitions) && freebsd)
{
struct grub_partition_bsd_entry whole_disk_be;
pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE
+ sizeof (struct grub_partition_bsd_entry)
* GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION;
if (grub_disk_read (disk, pos / GRUB_DISK_SECTOR_SIZE,
pos % GRUB_DISK_SECTOR_SIZE, sizeof (whole_disk_be),
&whole_disk_be))
return grub_errno;
delta = grub_le_to_cpu32 (whole_disk_be.offset);
}
pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE;
for (p.number = 0;
p.number < grub_cpu_to_le16 (label.num_partitions);
p.number++, pos += sizeof (struct grub_partition_bsd_entry))
{
struct grub_partition_bsd_entry be;
if (p.number == GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION)
continue;
p.offset = pos / GRUB_DISK_SECTOR_SIZE;
p.index = pos % GRUB_DISK_SECTOR_SIZE;
if (grub_disk_read (disk, p.offset, p.index, sizeof (be), &be))
return grub_errno;
p.start = grub_le_to_cpu32 (be.offset);
p.len = grub_le_to_cpu32 (be.size);
p.partmap = pmap;
if (p.len == 0)
continue;
if (p.start < delta)
{
#ifdef GRUB_UTIL
char *partname;
/* disk->partition != NULL as 0 < delta */
partname = disk->partition ? grub_partition_get_name (disk->partition)
: "";
grub_util_warn ("Discarding improperly nested partition (%s,%s,%s%d)",
disk->name, partname, p.partmap->name, p.number + 1);
grub_free (partname);
#endif
continue;
}
p.start -= delta;
if (hook (disk, &p))
return grub_errno;
}
return GRUB_ERR_NONE;
}
static grub_err_t
bsdlabel_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos")
== 0 && disk->partition->msdostype == GRUB_PC_PARTITION_TYPE_FREEBSD)
return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 1,
&grub_bsdlabel_partition_map, hook);
if (disk->partition
&& (grub_strcmp (disk->partition->partmap->name, "msdos") == 0
|| disk->partition->partmap == &grub_bsdlabel_partition_map
|| disk->partition->partmap == &grub_netbsdlabel_partition_map
|| disk->partition->partmap == &grub_openbsdlabel_partition_map))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0,
&grub_bsdlabel_partition_map, hook);
}
/* This is a total breakage. Even when net-/openbsd label is inside partition
it actually describes the whole disk.
*/
static grub_err_t
netopenbsdlabel_partition_map_iterate (grub_disk_t disk, grub_uint8_t type,
struct grub_partition_map *pmap,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
int count = 0;
auto int check_msdos (grub_disk_t dsk,
const grub_partition_t partition);
int check_msdos (grub_disk_t dsk,
const grub_partition_t partition)
{
grub_err_t err;
if (partition->msdostype != type)
return 0;
err = iterate_real (dsk, partition->start
+ GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, pmap, hook);
if (err == GRUB_ERR_NONE)
{
count++;
return 1;
}
if (err == GRUB_ERR_BAD_PART_TABLE)
{
grub_errno = GRUB_ERR_NONE;
return 0;
}
grub_print_error ();
return 0;
}
if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos")
== 0)
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
{
grub_err_t err;
err = grub_partition_msdos_iterate (disk, check_msdos);
if (err)
return err;
if (!count)
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no bsdlabel found");
}
return GRUB_ERR_NONE;
}
static grub_err_t
netbsdlabel_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
return netopenbsdlabel_partition_map_iterate (disk,
GRUB_PC_PARTITION_TYPE_NETBSD,
&grub_netbsdlabel_partition_map,
hook);
}
static grub_err_t
openbsdlabel_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
return netopenbsdlabel_partition_map_iterate (disk,
GRUB_PC_PARTITION_TYPE_OPENBSD,
&grub_openbsdlabel_partition_map,
hook);
}
static struct grub_partition_map grub_bsdlabel_partition_map =
{
.name = "bsd",
.iterate = bsdlabel_partition_map_iterate,
};
static struct grub_partition_map grub_openbsdlabel_partition_map =
{
.name = "openbsd",
.iterate = openbsdlabel_partition_map_iterate,
};
static struct grub_partition_map grub_netbsdlabel_partition_map =
{
.name = "netbsd",
.iterate = netbsdlabel_partition_map_iterate,
};
GRUB_MOD_INIT(part_bsd)
{
grub_partition_map_register (&grub_bsdlabel_partition_map);
grub_partition_map_register (&grub_netbsdlabel_partition_map);
grub_partition_map_register (&grub_openbsdlabel_partition_map);
}
GRUB_MOD_FINI(part_bsd)
{
grub_partition_map_unregister (&grub_bsdlabel_partition_map);
grub_partition_map_unregister (&grub_netbsdlabel_partition_map);
grub_partition_map_unregister (&grub_openbsdlabel_partition_map);
}