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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <errno.h>
#include <getopt.h>
#include "sd-device.h"
#include "sd-event.h"
#include "alloc-util.h"
#include "device-monitor-private.h"
#include "device-private.h"
#include "device-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "hashmap.h"
#include "set.h"
#include "signal-util.h"
#include "string-util.h"
#include "udevadm.h"
#include "virt.h"
#include "time-util.h"
static bool arg_show_property = false;
static bool arg_print_kernel = false;
static bool arg_print_udev = false;
static Set *arg_tag_filter = NULL;
static Hashmap *arg_subsystem_filter = NULL;
static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) {
sd_device_action_t action = _SD_DEVICE_ACTION_INVALID;
const char *devpath = NULL, *subsystem = NULL;
MonitorNetlinkGroup group = PTR_TO_INT(userdata);
struct timespec ts;
assert(device);
assert(IN_SET(group, MONITOR_GROUP_UDEV, MONITOR_GROUP_KERNEL));
(void) sd_device_get_action(device, &action);
(void) sd_device_get_devpath(device, &devpath);
(void) sd_device_get_subsystem(device, &subsystem);
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
printf("%-6s[%"PRI_TIME".%06"PRI_NSEC"] %-8s %s (%s)\n",
group == MONITOR_GROUP_UDEV ? "UDEV" : "KERNEL",
ts.tv_sec, (nsec_t)ts.tv_nsec/1000,
strna(device_action_to_string(action)),
devpath, subsystem);
if (arg_show_property) {
FOREACH_DEVICE_PROPERTY(device, key, value)
printf("%s=%s\n", key, value);
printf("\n");
}
return 0;
}
static int setup_monitor(MonitorNetlinkGroup sender, sd_event *event, sd_device_monitor **ret) {
_cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
const char *subsystem, *devtype, *tag;
int r;
r = device_monitor_new_full(&monitor, sender, -1);
if (r < 0)
return log_error_errno(r, "Failed to create netlink socket: %m");
r = sd_device_monitor_attach_event(monitor, event);
if (r < 0)
return log_error_errno(r, "Failed to attach event: %m");
HASHMAP_FOREACH_KEY(devtype, subsystem, arg_subsystem_filter) {
r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, devtype);
if (r < 0)
return log_error_errno(r, "Failed to apply subsystem filter '%s%s%s': %m",
subsystem, devtype ? "/" : "", strempty(devtype));
}
SET_FOREACH(tag, arg_tag_filter) {
r = sd_device_monitor_filter_add_match_tag(monitor, tag);
if (r < 0)
return log_error_errno(r, "Failed to apply tag filter '%s': %m", tag);
}
r = sd_device_monitor_start(monitor, device_monitor_handler, INT_TO_PTR(sender));
if (r < 0)
return log_error_errno(r, "Failed to start device monitor: %m");
(void) sd_device_monitor_set_description(monitor, sender == MONITOR_GROUP_UDEV ? "udev" : "kernel");
*ret = TAKE_PTR(monitor);
return 0;
}
static int help(void) {
printf("%s monitor [OPTIONS]\n\n"
"Listen to kernel and udev events.\n\n"
" -h --help Show this help\n"
" -V --version Show package version\n"
" -p --property Print the event properties\n"
" -k --kernel Print kernel uevents\n"
" -u --udev Print udev events\n"
" -s --subsystem-match=SUBSYSTEM[/DEVTYPE] Filter events by subsystem\n"
" -t --tag-match=TAG Filter events by tag\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
static const struct option options[] = {
{ "property", no_argument, NULL, 'p' },
{ "environment", no_argument, NULL, 'e' }, /* alias for -p */
{ "kernel", no_argument, NULL, 'k' },
{ "udev", no_argument, NULL, 'u' },
{ "subsystem-match", required_argument, NULL, 's' },
{ "tag-match", required_argument, NULL, 't' },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{}
};
int r, c;
while ((c = getopt_long(argc, argv, "pekus:t:Vh", options, NULL)) >= 0)
switch (c) {
case 'p':
case 'e':
arg_show_property = true;
break;
case 'k':
arg_print_kernel = true;
break;
case 'u':
arg_print_udev = true;
break;
case 's': {
_cleanup_free_ char *subsystem = NULL, *devtype = NULL;
const char *slash;
slash = strchr(optarg, '/');
if (slash) {
devtype = strdup(slash + 1);
if (!devtype)
return -ENOMEM;
subsystem = strndup(optarg, slash - optarg);
} else
subsystem = strdup(optarg);
if (!subsystem)
return -ENOMEM;
r = hashmap_ensure_put(&arg_subsystem_filter, NULL, subsystem, devtype);
if (r < 0)
return r;
TAKE_PTR(subsystem);
TAKE_PTR(devtype);
break;
}
case 't':
/* optarg is stored in argv[], so we don't need to copy it */
r = set_ensure_put(&arg_tag_filter, &string_hash_ops, optarg);
if (r < 0)
return r;
break;
case 'V':
return print_version();
case 'h':
return help();
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (!arg_print_kernel && !arg_print_udev) {
arg_print_kernel = true;
arg_print_udev = true;
}
return 1;
}
int monitor_main(int argc, char *argv[], void *userdata) {
_cleanup_(sd_device_monitor_unrefp) sd_device_monitor *kernel_monitor = NULL, *udev_monitor = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
int r;
r = parse_argv(argc, argv);
if (r <= 0)
goto finalize;
if (running_in_chroot() > 0) {
log_info("Running in chroot, ignoring request.");
return 0;
}
/* Callers are expecting to see events as they happen: Line buffering */
setlinebuf(stdout);
r = sd_event_default(&event);
if (r < 0) {
log_error_errno(r, "Failed to initialize event: %m");
goto finalize;
}
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
(void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
(void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
printf("monitor will print the received events for:\n");
if (arg_print_udev) {
r = setup_monitor(MONITOR_GROUP_UDEV, event, &udev_monitor);
if (r < 0)
goto finalize;
printf("UDEV - the event which udev sends out after rule processing\n");
}
if (arg_print_kernel) {
r = setup_monitor(MONITOR_GROUP_KERNEL, event, &kernel_monitor);
if (r < 0)
goto finalize;
printf("KERNEL - the kernel uevent\n");
}
printf("\n");
r = sd_event_loop(event);
if (r < 0) {
log_error_errno(r, "Failed to run event loop: %m");
goto finalize;
}
r = 0;
finalize:
hashmap_free_free_free(arg_subsystem_filter);
set_free(arg_tag_filter);
return r;
}
|
