Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0+ */
2 :
3 : #include <errno.h>
4 : #include <getopt.h>
5 : #include <signal.h>
6 :
7 : #include "sd-device.h"
8 : #include "sd-event.h"
9 :
10 : #include "alloc-util.h"
11 : #include "device-monitor-private.h"
12 : #include "device-private.h"
13 : #include "device-util.h"
14 : #include "fd-util.h"
15 : #include "format-util.h"
16 : #include "hashmap.h"
17 : #include "set.h"
18 : #include "signal-util.h"
19 : #include "string-util.h"
20 : #include "udevadm.h"
21 : #include "virt.h"
22 : #include "time-util.h"
23 :
24 : static bool arg_show_property = false;
25 : static bool arg_print_kernel = false;
26 : static bool arg_print_udev = false;
27 : static Set *arg_tag_filter = NULL;
28 : static Hashmap *arg_subsystem_filter = NULL;
29 :
30 0 : static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) {
31 0 : DeviceAction action = _DEVICE_ACTION_INVALID;
32 0 : const char *devpath = NULL, *subsystem = NULL;
33 0 : MonitorNetlinkGroup group = PTR_TO_INT(userdata);
34 : struct timespec ts;
35 :
36 0 : assert(device);
37 0 : assert(IN_SET(group, MONITOR_GROUP_UDEV, MONITOR_GROUP_KERNEL));
38 :
39 0 : (void) device_get_action(device, &action);
40 0 : (void) sd_device_get_devpath(device, &devpath);
41 0 : (void) sd_device_get_subsystem(device, &subsystem);
42 :
43 0 : assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
44 :
45 0 : printf("%-6s[%"PRI_TIME".%06"PRI_NSEC"] %-8s %s (%s)\n",
46 : group == MONITOR_GROUP_UDEV ? "UDEV" : "KERNEL",
47 0 : ts.tv_sec, (nsec_t)ts.tv_nsec/1000,
48 : strna(device_action_to_string(action)),
49 : devpath, subsystem);
50 :
51 0 : if (arg_show_property) {
52 : const char *key, *value;
53 :
54 0 : FOREACH_DEVICE_PROPERTY(device, key, value)
55 0 : printf("%s=%s\n", key, value);
56 :
57 0 : printf("\n");
58 : }
59 :
60 0 : return 0;
61 : }
62 :
63 0 : static int setup_monitor(MonitorNetlinkGroup sender, sd_event *event, sd_device_monitor **ret) {
64 0 : _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
65 : const char *subsystem, *devtype, *tag;
66 : Iterator i;
67 : int r;
68 :
69 0 : r = device_monitor_new_full(&monitor, sender, -1);
70 0 : if (r < 0)
71 0 : return log_error_errno(r, "Failed to create netlink socket: %m");
72 :
73 0 : (void) sd_device_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
74 :
75 0 : r = sd_device_monitor_attach_event(monitor, event);
76 0 : if (r < 0)
77 0 : return log_error_errno(r, "Failed to attach event: %m");
78 :
79 0 : HASHMAP_FOREACH_KEY(devtype, subsystem, arg_subsystem_filter, i) {
80 0 : r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, devtype);
81 0 : if (r < 0)
82 0 : return log_error_errno(r, "Failed to apply subsystem filter '%s%s%s': %m",
83 : subsystem, devtype ? "/" : "", strempty(devtype));
84 : }
85 :
86 0 : SET_FOREACH(tag, arg_tag_filter, i) {
87 0 : r = sd_device_monitor_filter_add_match_tag(monitor, tag);
88 0 : if (r < 0)
89 0 : return log_error_errno(r, "Failed to apply tag filter '%s': %m", tag);
90 : }
91 :
92 0 : r = sd_device_monitor_start(monitor, device_monitor_handler, INT_TO_PTR(sender));
93 0 : if (r < 0)
94 0 : return log_error_errno(r, "Failed to start device monitor: %m");
95 :
96 0 : (void) sd_event_source_set_description(sd_device_monitor_get_event_source(monitor),
97 : sender == MONITOR_GROUP_UDEV ? "device-monitor-udev" : "device-monitor-kernel");
98 :
99 0 : *ret = TAKE_PTR(monitor);
100 0 : return 0;
101 : }
102 :
103 0 : static int help(void) {
104 0 : printf("%s monitor [OPTIONS]\n\n"
105 : "Listen to kernel and udev events.\n\n"
106 : " -h --help Show this help\n"
107 : " -V --version Show package version\n"
108 : " -p --property Print the event properties\n"
109 : " -k --kernel Print kernel uevents\n"
110 : " -u --udev Print udev events\n"
111 : " -s --subsystem-match=SUBSYSTEM[/DEVTYPE] Filter events by subsystem\n"
112 : " -t --tag-match=TAG Filter events by tag\n"
113 : , program_invocation_short_name);
114 :
115 0 : return 0;
116 : }
117 :
118 0 : static int parse_argv(int argc, char *argv[]) {
119 : static const struct option options[] = {
120 : { "property", no_argument, NULL, 'p' },
121 : { "environment", no_argument, NULL, 'e' }, /* alias for -p */
122 : { "kernel", no_argument, NULL, 'k' },
123 : { "udev", no_argument, NULL, 'u' },
124 : { "subsystem-match", required_argument, NULL, 's' },
125 : { "tag-match", required_argument, NULL, 't' },
126 : { "version", no_argument, NULL, 'V' },
127 : { "help", no_argument, NULL, 'h' },
128 : {}
129 : };
130 :
131 : int r, c;
132 :
133 0 : while ((c = getopt_long(argc, argv, "pekus:t:Vh", options, NULL)) >= 0)
134 0 : switch (c) {
135 0 : case 'p':
136 : case 'e':
137 0 : arg_show_property = true;
138 0 : break;
139 0 : case 'k':
140 0 : arg_print_kernel = true;
141 0 : break;
142 0 : case 'u':
143 0 : arg_print_udev = true;
144 0 : break;
145 0 : case 's': {
146 0 : _cleanup_free_ char *subsystem = NULL, *devtype = NULL;
147 : const char *slash;
148 :
149 0 : slash = strchr(optarg, '/');
150 0 : if (slash) {
151 0 : devtype = strdup(slash + 1);
152 0 : if (!devtype)
153 0 : return -ENOMEM;
154 :
155 0 : subsystem = strndup(optarg, slash - optarg);
156 : } else
157 0 : subsystem = strdup(optarg);
158 :
159 0 : if (!subsystem)
160 0 : return -ENOMEM;
161 :
162 0 : r = hashmap_ensure_allocated(&arg_subsystem_filter, NULL);
163 0 : if (r < 0)
164 0 : return r;
165 :
166 0 : r = hashmap_put(arg_subsystem_filter, subsystem, devtype);
167 0 : if (r < 0)
168 0 : return r;
169 :
170 0 : subsystem = devtype = NULL;
171 0 : break;
172 : }
173 0 : case 't': {
174 0 : _cleanup_free_ char *tag = NULL;
175 :
176 0 : r = set_ensure_allocated(&arg_tag_filter, &string_hash_ops);
177 0 : if (r < 0)
178 0 : return r;
179 :
180 0 : tag = strdup(optarg);
181 0 : if (!tag)
182 0 : return -ENOMEM;
183 :
184 0 : r = set_put(arg_tag_filter, tag);
185 0 : if (r < 0)
186 0 : return r;
187 :
188 0 : tag = NULL;
189 0 : break;
190 : }
191 0 : case 'V':
192 0 : return print_version();
193 0 : case 'h':
194 0 : return help();
195 0 : case '?':
196 0 : return -EINVAL;
197 0 : default:
198 0 : assert_not_reached("Unknown option.");
199 : }
200 :
201 0 : if (!arg_print_kernel && !arg_print_udev) {
202 0 : arg_print_kernel = true;
203 0 : arg_print_udev = true;
204 : }
205 :
206 0 : return 1;
207 : }
208 :
209 0 : int monitor_main(int argc, char *argv[], void *userdata) {
210 0 : _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *kernel_monitor = NULL, *udev_monitor = NULL;
211 0 : _cleanup_(sd_event_unrefp) sd_event *event = NULL;
212 : int r;
213 :
214 0 : r = parse_argv(argc, argv);
215 0 : if (r <= 0)
216 0 : goto finalize;
217 :
218 0 : if (running_in_chroot() > 0) {
219 0 : log_info("Running in chroot, ignoring request.");
220 0 : return 0;
221 : }
222 :
223 : /* Callers are expecting to see events as they happen: Line buffering */
224 0 : setlinebuf(stdout);
225 :
226 0 : r = sd_event_default(&event);
227 0 : if (r < 0) {
228 0 : log_error_errno(r, "Failed to initialize event: %m");
229 0 : goto finalize;
230 : }
231 :
232 0 : assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
233 0 : (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
234 0 : (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
235 :
236 0 : printf("monitor will print the received events for:\n");
237 0 : if (arg_print_udev) {
238 0 : r = setup_monitor(MONITOR_GROUP_UDEV, event, &udev_monitor);
239 0 : if (r < 0)
240 0 : goto finalize;
241 :
242 0 : printf("UDEV - the event which udev sends out after rule processing\n");
243 : }
244 :
245 0 : if (arg_print_kernel) {
246 0 : r = setup_monitor(MONITOR_GROUP_KERNEL, event, &kernel_monitor);
247 0 : if (r < 0)
248 0 : goto finalize;
249 :
250 0 : printf("KERNEL - the kernel uevent\n");
251 : }
252 0 : printf("\n");
253 :
254 0 : r = sd_event_loop(event);
255 0 : if (r < 0) {
256 0 : log_error_errno(r, "Failed to run event loop: %m");
257 0 : goto finalize;
258 : }
259 :
260 0 : r = 0;
261 :
262 0 : finalize:
263 0 : hashmap_free_free_free(arg_subsystem_filter);
264 0 : set_free_free(arg_tag_filter);
265 :
266 0 : return r;
267 : }
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