diff options
Diffstat (limited to 'usr.sbin/fstyp/apfs.c')
| -rw-r--r-- | usr.sbin/fstyp/apfs.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/usr.sbin/fstyp/apfs.c b/usr.sbin/fstyp/apfs.c new file mode 100644 index 000000000000..7d4794b967bb --- /dev/null +++ b/usr.sbin/fstyp/apfs.c @@ -0,0 +1,108 @@ +/* + * 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 <iconv.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); +} |