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
199
200
201
202
203
204
205
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "fd-util.h"
#include "hexdecoct.h"
#include "id128-util.h"
#include "io-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "sync-util.h"
#include "virt.h"
bool id128_is_valid(const char *s) {
size_t l;
assert(s);
l = strlen(s);
if (l == SD_ID128_STRING_MAX - 1)
/* Plain formatted 128bit hex string */
return in_charset(s, HEXDIGITS);
if (l == SD_ID128_UUID_STRING_MAX - 1) {
/* Formatted UUID */
for (size_t i = 0; i < l; i++) {
char c = s[i];
if (IN_SET(i, 8, 13, 18, 23)) {
if (c != '-')
return false;
} else if (!ascii_ishex(c))
return false;
}
return true;
}
return false;
}
int id128_read_fd(int fd, Id128FormatFlag f, sd_id128_t *ret) {
char buffer[SD_ID128_UUID_STRING_MAX + 1]; /* +1 is for trailing newline */
ssize_t l;
assert(fd >= 0);
/* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
* optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they
* aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you
* accept".
*
* This returns the following:
* -ENOMEDIUM: an empty string,
* -ENOPKG: "uninitialized" or "uninitialized\n",
* -EINVAL: other invalid strings. */
l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */
if (l < 0)
return (int) l;
if (l == 0) /* empty? */
return -ENOMEDIUM;
switch (l) {
case STRLEN("uninitialized"):
case STRLEN("uninitialized\n"):
return strneq(buffer, "uninitialized\n", l) ? -ENOPKG : -EINVAL;
case SD_ID128_STRING_MAX: /* plain UUID with trailing newline */
if (buffer[SD_ID128_STRING_MAX-1] != '\n')
return -EINVAL;
_fallthrough_;
case SD_ID128_STRING_MAX-1: /* plain UUID without trailing newline */
if (!FLAGS_SET(f, ID128_FORMAT_PLAIN))
return -EINVAL;
buffer[SD_ID128_STRING_MAX-1] = 0;
break;
case SD_ID128_UUID_STRING_MAX: /* RFC UUID with trailing newline */
if (buffer[SD_ID128_UUID_STRING_MAX-1] != '\n')
return -EINVAL;
_fallthrough_;
case SD_ID128_UUID_STRING_MAX-1: /* RFC UUID without trailing newline */
if (!FLAGS_SET(f, ID128_FORMAT_UUID))
return -EINVAL;
buffer[SD_ID128_UUID_STRING_MAX-1] = 0;
break;
default:
return -EINVAL;
}
return sd_id128_from_string(buffer, ret);
}
int id128_read(const char *p, Id128FormatFlag f, sd_id128_t *ret) {
_cleanup_close_ int fd = -1;
fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fd < 0)
return -errno;
return id128_read_fd(fd, f, ret);
}
int id128_write_fd(int fd, Id128FormatFlag f, sd_id128_t id, bool do_sync) {
char buffer[SD_ID128_UUID_STRING_MAX + 1]; /* +1 is for trailing newline */
size_t sz;
int r;
assert(fd >= 0);
assert(IN_SET((f & ID128_FORMAT_ANY), ID128_FORMAT_PLAIN, ID128_FORMAT_UUID));
if (FLAGS_SET(f, ID128_FORMAT_PLAIN)) {
assert_se(sd_id128_to_string(id, buffer));
sz = SD_ID128_STRING_MAX;
} else {
assert_se(sd_id128_to_uuid_string(id, buffer));
sz = SD_ID128_UUID_STRING_MAX;
}
buffer[sz - 1] = '\n';
r = loop_write(fd, buffer, sz, false);
if (r < 0)
return r;
if (do_sync) {
r = fsync_full(fd);
if (r < 0)
return r;
}
return 0;
}
int id128_write(const char *p, Id128FormatFlag f, sd_id128_t id, bool do_sync) {
_cleanup_close_ int fd = -1;
fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444);
if (fd < 0)
return -errno;
return id128_write_fd(fd, f, id, do_sync);
}
void id128_hash_func(const sd_id128_t *p, struct siphash *state) {
siphash24_compress(p, sizeof(sd_id128_t), state);
}
int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) {
return memcmp(a, b, 16);
}
sd_id128_t id128_make_v4_uuid(sd_id128_t id) {
/* Stolen from generate_random_uuid() of drivers/char/random.c
* in the kernel sources */
/* Set UUID version to 4 --- truly random generation */
id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
/* Set the UUID variant to DCE */
id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
return id;
}
DEFINE_HASH_OPS(id128_hash_ops, sd_id128_t, id128_hash_func, id128_compare_func);
int id128_get_product(sd_id128_t *ret) {
sd_id128_t uuid;
int r;
assert(ret);
/* Reads the systems product UUID from DMI or devicetree (where it is located on POWER). This is
* particularly relevant in VM environments, where VM managers typically place a VM uuid there. */
r = detect_container();
if (r < 0)
return r;
if (r > 0) /* Refuse returning this in containers, as this is not a property of our system then, but
* of the host */
return -ENOENT;
r = id128_read("/sys/class/dmi/id/product_uuid", ID128_FORMAT_UUID, &uuid);
if (r == -ENOENT)
r = id128_read("/proc/device-tree/vm,uuid", ID128_FORMAT_UUID, &uuid);
if (r == -ENOENT)
r = id128_read("/sys/hypervisor/uuid", ID128_FORMAT_UUID, &uuid);
if (r < 0)
return r;
if (sd_id128_is_null(uuid) || sd_id128_is_allf(uuid))
return -EADDRNOTAVAIL; /* Recognizable error */
*ret = uuid;
return 0;
}
|
