1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "uuid.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
static unsigned char _c[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!#";
static int _built_inverse;
static unsigned char _inverse_c[256];
int lvid_create(union lvid *lvid, struct id *vgid)
{
memcpy(lvid->id, vgid, sizeof(*lvid->id));
return id_create(&lvid->id[1]);
}
void uuid_from_num(char *uuid, uint32_t num)
{
unsigned i;
for (i = ID_LEN; i; i--) {
uuid[i - 1] = _c[num % (sizeof(_c) - 1)];
num /= sizeof(_c) - 1;
}
uuid[ID_LEN] = '\0';
}
int lvid_from_lvnum(union lvid *lvid, struct id *vgid, uint32_t lv_num)
{
int i;
memcpy(lvid->id, vgid, sizeof(*lvid->id));
for (i = ID_LEN; i; i--) {
lvid->id[1].uuid[i - 1] = _c[lv_num % (sizeof(_c) - 1)];
lv_num /= sizeof(_c) - 1;
}
lvid->s[sizeof(lvid->s) - 1] = '\0';
return 1;
}
int lvnum_from_lvid(union lvid *lvid)
{
int i, lv_num = 0;
unsigned char *c;
for (i = 0; i < ID_LEN; i++) {
lv_num *= sizeof(_c) - 1;
if ((c = strchr(_c, lvid->id[1].uuid[i])))
lv_num += (int) (c - _c);
}
return lv_num;
}
int id_create(struct id *id)
{
int randomfile, i;
size_t len = sizeof(id->uuid);
memset(id->uuid, 0, len);
if ((randomfile = open("/dev/urandom", O_RDONLY)) < 0) {
log_sys_error("open", "id_create: /dev/urandom");
return 0;
}
if (read(randomfile, id->uuid, len) != len) {
log_sys_error("read", "id_create: /dev/urandom");
if (close(randomfile))
stack;
return 0;
}
if (close(randomfile))
stack;
/*
* Skip out the last 2 chars in randomized creation for LVM1
* backwards compatibility.
*/
for (i = 0; i < len; i++)
id->uuid[i] = _c[id->uuid[i] % (sizeof(_c) - 3)];
return 1;
}
/*
* The only validity check we have is that
* the uuid just contains characters from
* '_c'. A checksum would have been nice :(
*/
static void _build_inverse(void)
{
char *ptr;
if (_built_inverse)
return;
memset(_inverse_c, 0, sizeof(_inverse_c));
for (ptr = _c; *ptr; ptr++)
_inverse_c[(int) *ptr] = (char) 0x1;
}
int id_valid(struct id *id)
{
int i;
_build_inverse();
for (i = 0; i < ID_LEN; i++)
if (!_inverse_c[id->uuid[i]]) {
log_err("UUID contains invalid character");
return 0;
}
return 1;
}
int id_equal(const struct id *lhs, const struct id *rhs)
{
return !memcmp(lhs->uuid, rhs->uuid, sizeof(lhs->uuid));
}
#define GROUPS (ID_LEN / 4)
int id_write_format(const struct id *id, char *buffer, size_t size)
{
int i, tot;
static unsigned group_size[] = { 6, 4, 4, 4, 4, 4, 6 };
assert(ID_LEN == 32);
/* split into groups separated by dashes */
if (size < (32 + 6 + 1)) {
log_err("Couldn't write uuid, buffer too small.");
return 0;
}
for (i = 0, tot = 0; i < 7; i++) {
memcpy(buffer, id->uuid + tot, group_size[i]);
buffer += group_size[i];
tot += group_size[i];
*buffer++ = '-';
}
*--buffer = '\0';
return 1;
}
int id_read_format(struct id *id, const char *buffer)
{
int out = 0;
/* just strip out any dashes */
while (*buffer) {
if (*buffer == '-') {
buffer++;
continue;
}
if (out >= ID_LEN) {
log_err("Too many characters to be uuid.");
return 0;
}
id->uuid[out++] = *buffer++;
}
if (out != ID_LEN) {
log_err("Couldn't read uuid, incorrect number of characters.");
return 0;
}
return id_valid(id);
}
|
