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-rw-r--r--src/udev/udevadm-monitor.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/src/udev/udevadm-monitor.c b/src/udev/udevadm-monitor.c
new file mode 100644
index 0000000..e45188b
--- /dev/null
+++ b/src/udev/udevadm-monitor.c
@@ -0,0 +1,248 @@
+/* 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) {
+ const char *key, *value;
+
+ 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;
+}