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/*
* BSD/OSF partition parsing code
*
* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*
* Inspired by fdisk, partx, Linux kernel, libparted and openbsd header files.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "partitions.h"
#include "pt-bsd.h"
/* Returns 'blkid_idmag' in 512-sectors */
#define BLKID_MAG_SECTOR(_mag) (((_mag)->kboff / 2) + ((_mag)->sboff >> 9))
/* Returns 'blkid_idmag' in bytes */
#define BLKID_MAG_OFFSET(_mag) ((_mag)->kboff << 10) + ((_mag)->sboff)
/* Returns 'blkid_idmag' offset in bytes within the last sector */
#define BLKID_MAG_LASTOFFSET(_mag) \
(BLKID_MAG_OFFSET(_mag) - (BLKID_MAG_SECTOR(_mag) << 9))
static uint16_t bsd_checksum(const struct bsd_disklabel *l)
{
uint16_t v, csum = 0;
const char *end = (const char *) (l + 1);
for (const char *c = (const char *) l; c < end; c += sizeof(uint16_t)) {
memcpy(&v, c, sizeof(v));
csum ^= v;
}
return csum ^ le16_to_cpu(l->d_checksum);
}
static int probe_bsd_pt(blkid_probe pr, const struct blkid_idmag *mag)
{
struct bsd_disklabel *l;
struct bsd_partition *p;
const char *name = "bsd" ;
blkid_parttable tab = NULL;
blkid_partition parent;
blkid_partlist ls;
int i, nparts = BSD_MAXPARTITIONS;
unsigned char *data;
int rc = BLKID_PROBE_NONE;
uint32_t abs_offset = 0;
if (blkid_partitions_need_typeonly(pr))
/* caller does not ask for details about partitions */
return rc;
data = blkid_probe_get_sector(pr, BLKID_MAG_SECTOR(mag));
if (!data) {
if (errno)
rc = -errno;
goto nothing;
}
l = (struct bsd_disklabel *) (data + BLKID_MAG_LASTOFFSET(mag));
if (!blkid_probe_verify_csum(pr, bsd_checksum(l), le16_to_cpu(l->d_checksum))) {
rc = BLKID_PROBE_NONE;
goto nothing;
}
ls = blkid_probe_get_partlist(pr);
if (!ls)
goto nothing;
/* try to determine the real type of BSD system according to
* (parental) primary partition */
parent = blkid_partlist_get_parent(ls);
if (parent) {
switch(blkid_partition_get_type(parent)) {
case MBR_FREEBSD_PARTITION:
name = "freebsd";
abs_offset = blkid_partition_get_start(parent);
break;
case MBR_NETBSD_PARTITION:
name = "netbsd";
break;
case MBR_OPENBSD_PARTITION:
name = "openbsd";
break;
default:
DBG(LOWPROBE, ul_debug(
"WARNING: BSD label detected on unknown (0x%x) "
"primary partition",
blkid_partition_get_type(parent)));
break;
}
}
tab = blkid_partlist_new_parttable(ls, name, BLKID_MAG_OFFSET(mag));
if (!tab) {
rc = -ENOMEM;
goto nothing;
}
if (le16_to_cpu(l->d_npartitions) < BSD_MAXPARTITIONS)
nparts = le16_to_cpu(l->d_npartitions);
else if (le16_to_cpu(l->d_npartitions) > BSD_MAXPARTITIONS)
DBG(LOWPROBE, ul_debug(
"WARNING: ignore %d more BSD partitions",
le16_to_cpu(l->d_npartitions) - BSD_MAXPARTITIONS));
for (i = 0, p = l->d_partitions; i < nparts; i++, p++) {
blkid_partition par;
uint32_t start, size;
if (p->p_fstype == BSD_FS_UNUSED)
continue;
start = le32_to_cpu(p->p_offset);
size = le32_to_cpu(p->p_size);
/* FreeBSD since version 10 uses relative offsets. We can use
* 3rd partition (special wholedisk partition) to detect this
* situation.
*/
if (abs_offset && nparts >= 3
&& le32_to_cpu(l->d_partitions[2].p_offset) == 0)
start += abs_offset;
if (parent && blkid_partition_get_start(parent) == start
&& blkid_partition_get_size(parent) == size) {
DBG(LOWPROBE, ul_debug(
"WARNING: BSD partition (%d) same like parent, "
"ignore", i));
continue;
}
if (parent && !blkid_is_nested_dimension(parent, start, size)) {
DBG(LOWPROBE, ul_debug(
"WARNING: BSD partition (%d) overflow "
"detected, ignore", i));
continue;
}
par = blkid_partlist_add_partition(ls, tab, start, size);
if (!par) {
rc = -ENOMEM;
goto nothing;
}
blkid_partition_set_type(par, p->p_fstype);
}
return BLKID_PROBE_OK;
nothing:
return rc;
}
/*
* All BSD variants use the same magic string (little-endian),
* and the same disklabel.
*
* The difference between {Free,Open,...}BSD is in the (parental)
* primary partition type.
*
* See also: http://en.wikipedia.org/wiki/BSD_disklabel
*
* The location of BSD disk label is architecture specific and in defined by
* LABELSECTOR and LABELOFFSET macros in the disklabel.h file. The location
* also depends on BSD variant, FreeBSD uses only one location, NetBSD and
* OpenBSD are more creative...
*
* The basic overview:
*
* arch | LABELSECTOR | LABELOFFSET
* ------------------------+-------------+------------
* amd64 arm hppa hppa64 | |
* i386, macppc, mvmeppc | 1 | 0
* sgi, aviion, sh, socppc | |
* ------------------------+-------------+------------
* alpha luna88k mac68k | 0 | 64
* sparc(OpenBSD) vax | |
* ------------------------+-------------+------------
* sparc64 sparc(NetBSD) | 0 | 128
* ------------------------+-------------+------------
*
* ...and more (see http://fxr.watson.org/fxr/ident?v=NETBSD;i=LABELSECTOR)
*
*/
const struct blkid_idinfo bsd_pt_idinfo =
{
.name = "bsd",
.probefunc = probe_bsd_pt,
.magics =
{
{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 512 },
{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 64 },
{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 128 },
{ NULL }
}
};
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