1 /* $NetBSD: ffs_appleufs.c,v 1.15 2015/02/15 11:04:43 maxv Exp $ */
2
3 /*
4 * Copyright (c) 2002 Darrin B. Jewell
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: ffs_appleufs.c,v 1.15 2015/02/15 11:04:43 maxv Exp $");
30
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #if defined(_KERNEL)
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
36 #include <sys/cprng.h>
37 #endif
38
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ufs/ufs_bswap.h>
41 #include <ufs/ffs/fs.h>
42 #include <ufs/ffs/ffs_extern.h>
43
44 #if !defined(_KERNEL) && !defined(STANDALONE)
45 #include <stddef.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <errno.h>
50 #include <assert.h>
51 #define KASSERT(x) assert(x)
52 #endif
53
54 /*
55 * This is the same calculation as in_cksum.
56 */
57 u_int16_t
ffs_appleufs_cksum(const struct appleufslabel * appleufs)58 ffs_appleufs_cksum(const struct appleufslabel *appleufs)
59 {
60 const u_int16_t *p = (const u_int16_t *)appleufs;
61 int len = APPLEUFS_LABEL_SIZE; /* sizeof(struct appleufslabel) */
62 long res = 0;
63 while (len > 1) {
64 res += *p++;
65 len -= 2;
66 }
67 #if 0 /* APPLEUFS_LABEL_SIZE is guaranteed to be even */
68 if (len == 1)
69 res += htobe16(*(u_char *)p<<8);
70 #endif
71 res = (res >> 16) + (res & 0xffff);
72 res += (res >> 16);
73 return (~res);
74 }
75
76 /*
77 * Copies o to n, validating and byteswapping along the way. Returns 0 if ok,
78 * EINVAL if not valid.
79 */
80 int
ffs_appleufs_validate(const char * name,const struct appleufslabel * o,struct appleufslabel * n)81 ffs_appleufs_validate(const char *name, const struct appleufslabel *o,
82 struct appleufslabel *n)
83 {
84 struct appleufslabel tmp;
85
86 if (!n)
87 n = &tmp;
88 if (o->ul_magic != be32toh(APPLEUFS_LABEL_MAGIC))
89 return EINVAL;
90
91 *n = *o;
92 n->ul_checksum = 0;
93 n->ul_checksum = ffs_appleufs_cksum(n);
94 n->ul_magic = be32toh(o->ul_magic);
95 n->ul_version = be32toh(o->ul_version);
96 n->ul_time = be32toh(o->ul_time);
97 n->ul_namelen = be16toh(o->ul_namelen);
98
99 if (n->ul_checksum != o->ul_checksum)
100 return EINVAL;
101 if (n->ul_namelen == 0)
102 return EINVAL;
103 if (n->ul_namelen > APPLEUFS_MAX_LABEL_NAME)
104 n->ul_namelen = APPLEUFS_MAX_LABEL_NAME;
105
106 n->ul_name[n->ul_namelen - 1] = '\0';
107
108 #ifdef DEBUG
109 printf("%s: found APPLE UFS label v%d: \"%s\"\n", name,
110 n->ul_version, n->ul_name);
111 #endif
112 n->ul_uuid = be64toh(o->ul_uuid);
113
114 return 0;
115 }
116
117 void
ffs_appleufs_set(struct appleufslabel * appleufs,const char * name,time_t t,uint64_t uuid)118 ffs_appleufs_set(struct appleufslabel *appleufs, const char *name, time_t t,
119 uint64_t uuid)
120 {
121 size_t namelen;
122
123 if (!name)
124 name = "untitled";
125 if (t == ((time_t)-1)) {
126 #if defined(_KERNEL)
127 t = time_second;
128 #elif defined(STANDALONE)
129 t = 0;
130 #else
131 (void)time(&t);
132 #endif
133 }
134 if (uuid == 0) {
135 #if defined(_KERNEL) && !defined(STANDALONE)
136 uuid = cprng_fast64();
137 #endif
138 }
139 namelen = strlen(name);
140 if (namelen > APPLEUFS_MAX_LABEL_NAME)
141 namelen = APPLEUFS_MAX_LABEL_NAME;
142 memset(appleufs, 0, APPLEUFS_LABEL_SIZE);
143 appleufs->ul_magic = htobe32(APPLEUFS_LABEL_MAGIC);
144 appleufs->ul_version = htobe32(APPLEUFS_LABEL_VERSION);
145 appleufs->ul_time = htobe32((u_int32_t)t);
146 appleufs->ul_namelen = htobe16(namelen);
147 strncpy(appleufs->ul_name, name, namelen);
148 appleufs->ul_uuid = htobe64(uuid);
149 appleufs->ul_checksum = ffs_appleufs_cksum(appleufs);
150 }
151