1 /*
2 * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #include <assert.h>
28 #include <err.h>
29 #include <errno.h>
30 #include <stdbool.h>
31 #include <stdint.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #include "fstyp.h"
37
38 /*
39 * This really detects the container format, which might be best supported by
40 * geom_part or a special GEOM class.
41 *
42 * https://developer.apple.com/support/downloads/Apple-File-System-Reference.pdf
43 */
44
45 #define NX_CKSUM_SZ 8
46
47 typedef uint64_t nx_oid_t;
48
49 typedef uint64_t nx_xid_t;
50
51 struct nx_obj {
52 uint8_t o_cksum[NX_CKSUM_SZ]; /* Fletcher 64 */
53 nx_oid_t o_oid;
54 nx_xid_t o_xid;
55 uint32_t o_type;
56 uint32_t o_subtype;
57 };
58
59 /* nx_obj::o_oid */
60 #define OID_NX_SUPERBLOCK 1
61
62 /* nx_obj::o_type: */
63 #define OBJECT_TYPE_MASK 0x0000ffff
64 #define OBJECT_TYPE_NX_SUPERBLOCK 0x00000001
65 #define OBJECT_TYPE_FLAGS_MASK 0xffff0000
66 #define OBJ_STORAGETYPE_MASK 0xc0000000
67 #define OBJECT_TYPE_FLAGS_DEFINED_MASK 0xf8000000
68 #define OBJ_STORAGE_VIRTUAL 0x00000000
69 #define OBJ_STORAGE_EPHEMERAL 0x80000000
70 #define OBJ_STORAGE_PHYSICAL 0x40000000
71 #define OBJ_NOHEADER 0x20000000
72 #define OBJ_ENCRYPTED 0x10000000
73 #define OBJ_NONPERSISTENT 0x08000000
74
75 struct nx_superblock {
76 struct nx_obj nx_o;
77 char nx_magic[4];
78 /* ... other stuff that doesn't matter */
79 };
80
81 int
fstyp_apfs(FILE * fp,char * label,size_t size)82 fstyp_apfs(FILE *fp, char *label, size_t size)
83 {
84 struct nx_superblock *csb;
85 int retval;
86
87 retval = 1;
88 csb = read_buf(fp, 0, sizeof(*csb));
89 if (csb == NULL)
90 goto fail;
91
92 /* Ideally, checksum the SB here. */
93 if (strncmp(csb->nx_magic, "NXSB", 4) != 0 ||
94 csb->nx_o.o_oid != OID_NX_SUPERBLOCK ||
95 (csb->nx_o.o_type & OBJECT_TYPE_MASK) != OBJECT_TYPE_NX_SUPERBLOCK)
96 goto fail;
97
98 retval = 0;
99
100 /* No label support yet. */
101 (void)size;
102 (void)label;
103
104 fail:
105 free(csb);
106 return (retval);
107 }
108