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/*
* Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fstyp.h"
/*
* This really detects the container format, which might be best supported by
* geom_part or a special GEOM class.
*
* https://developer.apple.com/support/downloads/Apple-File-System-Reference.pdf
*/
#define NX_CKSUM_SZ 8
typedef uint64_t nx_oid_t;
typedef uint64_t nx_xid_t;
struct nx_obj {
uint8_t o_cksum[NX_CKSUM_SZ]; /* Fletcher 64 */
nx_oid_t o_oid;
nx_xid_t o_xid;
uint32_t o_type;
uint32_t o_subtype;
};
/* nx_obj::o_oid */
#define OID_NX_SUPERBLOCK 1
/* nx_obj::o_type: */
#define OBJECT_TYPE_MASK 0x0000ffff
#define OBJECT_TYPE_NX_SUPERBLOCK 0x00000001
#define OBJECT_TYPE_FLAGS_MASK 0xffff0000
#define OBJ_STORAGETYPE_MASK 0xc0000000
#define OBJECT_TYPE_FLAGS_DEFINED_MASK 0xf8000000
#define OBJ_STORAGE_VIRTUAL 0x00000000
#define OBJ_STORAGE_EPHEMERAL 0x80000000
#define OBJ_STORAGE_PHYSICAL 0x40000000
#define OBJ_NOHEADER 0x20000000
#define OBJ_ENCRYPTED 0x10000000
#define OBJ_NONPERSISTENT 0x08000000
struct nx_superblock {
struct nx_obj nx_o;
char nx_magic[4];
/* ... other stuff that doesn't matter */
};
int
fstyp_apfs(FILE *fp, char *label, size_t size)
{
struct nx_superblock *csb;
int retval;
retval = 1;
csb = read_buf(fp, 0, sizeof(*csb));
if (csb == NULL)
goto fail;
/* Ideally, checksum the SB here. */
if (strncmp(csb->nx_magic, "NXSB", 4) != 0 ||
csb->nx_o.o_oid != OID_NX_SUPERBLOCK ||
(csb->nx_o.o_type & OBJECT_TYPE_MASK) != OBJECT_TYPE_NX_SUPERBLOCK)
goto fail;
retval = 0;
/* No label support yet. */
fail:
free(csb);
return (retval);
}
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