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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "arphrd-util.h"
#include "device-util.h"
#include "netif-util.h"
#include "siphash24.h"
#include "sparse-endian.h"
#include "strv.h"
int net_get_type_string(sd_device *device, uint16_t iftype, char **ret) {
const char *t;
char *p;
if (device &&
sd_device_get_devtype(device, &t) >= 0 &&
!isempty(t)) {
p = strdup(t);
if (!p)
return -ENOMEM;
*ret = p;
return 0;
}
t = arphrd_to_name(iftype);
if (!t)
return -ENOENT;
p = strdup(t);
if (!p)
return -ENOMEM;
*ret = ascii_strlower(p);
return 0;
}
const char *net_get_persistent_name(sd_device *device) {
const char *name, *field;
assert(device);
/* fetch some persistent data unique (on this machine) to this device */
FOREACH_STRING(field, "ID_NET_NAME_ONBOARD", "ID_NET_NAME_SLOT", "ID_NET_NAME_PATH", "ID_NET_NAME_MAC")
if (sd_device_get_property_value(device, field, &name) >= 0)
return name;
return NULL;
}
/* Used when generating hardware address by udev, and IPv4LL seed by networkd. */
#define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)
int net_get_unique_predictable_data(sd_device *device, bool use_sysname, uint64_t *ret) {
const char *name;
assert(device);
assert(ret);
/* net_get_persistent_name() will return one of the device names based on stable information about
* the device. If this is not available, we fall back to using the actual device name. */
name = net_get_persistent_name(device);
if (!name && use_sysname)
(void) sd_device_get_sysname(device, &name);
if (!name)
return log_device_debug_errno(device, SYNTHETIC_ERRNO(ENODATA),
"No stable identifying information found");
log_device_debug(device, "Using \"%s\" as stable identifying information", name);
return net_get_unique_predictable_data_from_name(name, &HASH_KEY, ret);
}
int net_get_unique_predictable_data_from_name(
const char *name,
const sd_id128_t *key,
uint64_t *ret) {
size_t l, sz;
uint8_t *v;
int r;
assert(name);
assert(key);
assert(ret);
l = strlen(name);
sz = sizeof(sd_id128_t) + l;
v = newa(uint8_t, sz);
/* Fetch some persistent data unique to this machine */
r = sd_id128_get_machine((sd_id128_t*) v);
if (r < 0)
return r;
memcpy(v + sizeof(sd_id128_t), name, l);
/* Let's hash the machine ID plus the device name. We use
* a fixed, but originally randomly created hash key here. */
*ret = htole64(siphash24(v, sz, key->bytes));
return 0;
}
|
