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/* SPDX-License-Identifier: GPL-2.0+ */
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include "sd-device.h"
#include "sd-event.h"
#include "alloc-util.h"
#include "device-monitor-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"
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) {
const char *action = NULL, *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_property_value(device, "ACTION", &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,
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;
Iterator i;
int r;
r = device_monitor_new_full(&monitor, sender, -1);
if (r < 0)
return log_error_errno(r, "Failed to create netlink socket: %m");
(void) sd_device_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
r = sd_device_monitor_attach_event(monitor, event, 0);
if (r < 0)
return log_error_errno(r, "Failed to attach event: %m");
HASHMAP_FOREACH_KEY(devtype, subsystem, arg_subsystem_filter, i) {
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, i) {
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), sender == MONITOR_GROUP_UDEV ? "device-monitor-udev" : "device-monitor-kernel");
if (r < 0)
return log_error_errno(r, "Failed to start device monitor: %m");
*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(devtype + 1);
if (!devtype)
return -ENOMEM;
subsystem = strndup(optarg, devtype - optarg);
} else
subsystem = strdup(optarg);
if (!subsystem)
return -ENOMEM;
r = hashmap_ensure_allocated(&arg_subsystem_filter, NULL);
if (r < 0)
return r;
r = hashmap_put(arg_subsystem_filter, subsystem, devtype);
if (r < 0)
return r;
subsystem = devtype = NULL;
break;
}
case 't': {
_cleanup_free_ char *tag = NULL;
r = set_ensure_allocated(&arg_tag_filter, &string_hash_ops);
if (r < 0)
return r;
tag = strdup(optarg);
if (!tag)
return -ENOMEM;
r = set_put(arg_tag_filter, tag);
if (r < 0)
return r;
tag = NULL;
break;
}
case 'V':
return print_version();
case 'h':
return help();
case '?':
return -EINVAL;
default:
assert_not_reached("Unknown option.");
}
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;
/* 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_UNBLOCK, 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_free(arg_tag_filter);
return r;
}
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