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
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/***
This file is part of systemd.
Copyright 2012 Kay Sievers <kay@vrfy.org>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
#include <fnmatch.h>
#include <getopt.h>
#include "udev.h"
static struct udev_hwdb *hwdb;
int udev_builtin_hwdb_lookup(struct udev_device *dev,
const char *prefix, const char *modalias,
const char *filter, bool test) {
struct udev_list_entry *list;
struct udev_list_entry *entry;
int n = 0;
if (!hwdb)
return -ENOENT;
if (prefix) {
_cleanup_free_ const char *lookup;
lookup = strjoin(prefix, modalias, NULL);
if (!lookup)
return -ENOMEM;
list = udev_hwdb_get_properties_list_entry(hwdb, lookup, 0);
} else
list = udev_hwdb_get_properties_list_entry(hwdb, modalias, 0);
udev_list_entry_foreach(entry, list) {
if (filter && fnmatch(filter, udev_list_entry_get_name(entry), FNM_NOESCAPE) != 0)
continue;
if (udev_builtin_add_property(dev, test,
udev_list_entry_get_name(entry),
udev_list_entry_get_value(entry)) < 0)
return -ENOMEM;
n++;
}
return n;
}
static const char *modalias_usb(struct udev_device *dev, char *s, size_t size) {
const char *v, *p;
int vn, pn;
v = udev_device_get_sysattr_value(dev, "idVendor");
if (!v)
return NULL;
p = udev_device_get_sysattr_value(dev, "idProduct");
if (!p)
return NULL;
vn = strtol(v, NULL, 16);
if (vn <= 0)
return NULL;
pn = strtol(p, NULL, 16);
if (pn <= 0)
return NULL;
snprintf(s, size, "usb:v%04Xp%04X*", vn, pn);
return s;
}
static int udev_builtin_hwdb_search(struct udev_device *dev, struct udev_device *srcdev,
const char *subsystem, const char *prefix,
const char *filter, bool test) {
struct udev_device *d;
char s[16];
bool last = false;
int r = 0;
for (d = srcdev; d && !last; d = udev_device_get_parent(d)) {
const char *dsubsys;
const char *modalias = NULL;
dsubsys = udev_device_get_subsystem(d);
if (!dsubsys)
continue;
/* look only at devices of a specific subsystem */
if (subsystem && !streq(dsubsys, subsystem))
continue;
modalias = udev_device_get_property_value(d, "MODALIAS");
if (streq(dsubsys, "usb") && streq_ptr(udev_device_get_devtype(d), "usb_device")) {
/* if the usb_device does not have a modalias, compose one */
if (!modalias)
modalias = modalias_usb(d, s, sizeof(s));
/* avoid looking at any parent device, they are usually just a USB hub */
last = true;
}
if (!modalias)
continue;
r = udev_builtin_hwdb_lookup(dev, prefix, modalias, filter, test);
if (r > 0)
break;
}
return r;
}
static int builtin_hwdb(struct udev_device *dev, int argc, char *argv[], bool test) {
static const struct option options[] = {
{ "filter", required_argument, NULL, 'f' },
{ "device", required_argument, NULL, 'd' },
{ "subsystem", required_argument, NULL, 's' },
{ "lookup-prefix", required_argument, NULL, 'p' },
{}
};
const char *filter = NULL;
const char *device = NULL;
const char *subsystem = NULL;
const char *prefix = NULL;
struct udev_device *srcdev;
if (!hwdb)
return EXIT_FAILURE;
for (;;) {
int option;
option = getopt_long(argc, argv, "f:d:s:p:", options, NULL);
if (option == -1)
break;
switch (option) {
case 'f':
filter = optarg;
break;
case 'd':
device = optarg;
break;
case 's':
subsystem = optarg;
break;
case 'p':
prefix = optarg;
break;
}
}
/* query a specific key given as argument */
if (argv[optind]) {
if (udev_builtin_hwdb_lookup(dev, prefix, argv[optind], filter, test) > 0)
return EXIT_SUCCESS;
return EXIT_FAILURE;
}
/* read data from another device than the device we will store the data */
if (device) {
srcdev = udev_device_new_from_device_id(udev_device_get_udev(dev), device);
if (!srcdev)
return EXIT_FAILURE;
} else
srcdev = dev;
if (udev_builtin_hwdb_search(dev, srcdev, subsystem, prefix, filter, test) > 0)
return EXIT_SUCCESS;
return EXIT_FAILURE;
}
/* called at udev startup and reload */
static int builtin_hwdb_init(struct udev *udev) {
if (hwdb)
return 0;
hwdb = udev_hwdb_new(udev);
if (!hwdb)
return -ENOMEM;
return 0;
}
/* called on udev shutdown and reload request */
static void builtin_hwdb_exit(struct udev *udev) {
hwdb = udev_hwdb_unref(hwdb);
}
/* called every couple of seconds during event activity; 'true' if config has changed */
static bool builtin_hwdb_validate(struct udev *udev) {
return udev_hwdb_validate(hwdb);
}
const struct udev_builtin udev_builtin_hwdb = {
.name = "hwdb",
.cmd = builtin_hwdb,
.init = builtin_hwdb_init,
.exit = builtin_hwdb_exit,
.validate = builtin_hwdb_validate,
.help = "hardware database",
};
|
