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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <errno.h>
#include <getopt.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "creds-util.h"
#include "parse-util.h"
#include "process-util.h"
#include "static-destruct.h"
#include "strv.h"
#include "syslog-util.h"
#include "time-util.h"
#include "udevadm.h"
#include "udev-ctrl.h"
#include "virt.h"
static char **arg_env = NULL;
static usec_t arg_timeout = 60 * USEC_PER_SEC;
static bool arg_ping = false;
static bool arg_reload = false;
static bool arg_exit = false;
static int arg_max_children = -1;
static int arg_log_level = -1;
static int arg_start_exec_queue = -1;
static bool arg_load_credentials = false;
STATIC_DESTRUCTOR_REGISTER(arg_env, strv_freep);
static bool arg_has_control_commands(void) {
return
arg_exit ||
arg_log_level >= 0 ||
arg_start_exec_queue >= 0 ||
arg_reload ||
!strv_isempty(arg_env) ||
arg_max_children >= 0 ||
arg_ping;
}
static int help(void) {
printf("%s control OPTION\n\n"
"Control the udev daemon.\n\n"
" -h --help Show this help\n"
" -V --version Show package version\n"
" -e --exit Instruct the daemon to cleanup and exit\n"
" -l --log-level=LEVEL Set the udev log level for the daemon\n"
" -s --stop-exec-queue Do not execute events, queue only\n"
" -S --start-exec-queue Execute events, flush queue\n"
" -R --reload Reload rules and databases\n"
" -p --property=KEY=VALUE Set a global property for all events\n"
" -m --children-max=N Maximum number of children\n"
" --ping Wait for udev to respond to a ping message\n"
" -t --timeout=SECONDS Maximum time to block for a reply\n"
" --load-credentials Load udev rules from credentials\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_PING = 0x100,
ARG_LOAD_CREDENTIALS,
};
static const struct option options[] = {
{ "exit", no_argument, NULL, 'e' },
{ "log-level", required_argument, NULL, 'l' },
{ "log-priority", required_argument, NULL, 'l' }, /* for backward compatibility */
{ "stop-exec-queue", no_argument, NULL, 's' },
{ "start-exec-queue", no_argument, NULL, 'S' },
{ "reload", no_argument, NULL, 'R' },
{ "reload-rules", no_argument, NULL, 'R' }, /* alias for -R */
{ "property", required_argument, NULL, 'p' },
{ "env", required_argument, NULL, 'p' }, /* alias for -p */
{ "children-max", required_argument, NULL, 'm' },
{ "ping", no_argument, NULL, ARG_PING },
{ "timeout", required_argument, NULL, 't' },
{ "load-credentials", no_argument, NULL, ARG_LOAD_CREDENTIALS },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "el:sSRp:m:t:Vh", options, NULL)) >= 0)
switch (c) {
case 'e':
arg_exit = true;
break;
case 'l':
arg_log_level = log_level_from_string(optarg);
if (arg_log_level < 0)
return log_error_errno(arg_log_level, "Failed to parse log level '%s': %m", optarg);
break;
case 's':
arg_start_exec_queue = false;
break;
case 'S':
arg_start_exec_queue = true;
break;
case 'R':
arg_reload = true;
break;
case 'p':
if (!strchr(optarg, '='))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "expect <KEY>=<value> instead of '%s'", optarg);
r = strv_extend(&arg_env, optarg);
if (r < 0)
return log_error_errno(r, "Failed to extend environment: %m");
break;
case 'm': {
unsigned i;
r = safe_atou(optarg, &i);
if (r < 0)
return log_error_errno(r, "Failed to parse maximum number of children '%s': %m", optarg);
arg_max_children = i;
break;
}
case ARG_PING:
arg_ping = true;
break;
case 't':
r = parse_sec(optarg, &arg_timeout);
if (r < 0)
return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
break;
case ARG_LOAD_CREDENTIALS:
arg_load_credentials = true;
break;
case 'V':
return print_version();
case 'h':
return help();
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (!arg_has_control_commands() && !arg_load_credentials)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"No control command option is specified.");
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Extraneous argument: %s", argv[optind]);
return 1;
}
static int send_control_commands(void) {
_cleanup_(udev_ctrl_unrefp) UdevCtrl *uctrl = NULL;
int r;
r = udev_ctrl_new(&uctrl);
if (r < 0)
return log_error_errno(r, "Failed to initialize udev control: %m");
if (arg_exit) {
r = udev_ctrl_send_exit(uctrl);
if (r < 0)
return log_error_errno(r, "Failed to send exit request: %m");
return 0;
}
if (arg_log_level >= 0) {
r = udev_ctrl_send_set_log_level(uctrl, arg_log_level);
if (r < 0)
return log_error_errno(r, "Failed to send request to set log level: %m");
}
if (arg_start_exec_queue == false) {
r = udev_ctrl_send_stop_exec_queue(uctrl);
if (r < 0)
return log_error_errno(r, "Failed to send request to stop exec queue: %m");
}
if (arg_start_exec_queue == true) {
r = udev_ctrl_send_start_exec_queue(uctrl);
if (r < 0)
return log_error_errno(r, "Failed to send request to start exec queue: %m");
}
if (arg_reload) {
r = udev_ctrl_send_reload(uctrl);
if (r < 0)
return log_error_errno(r, "Failed to send reload request: %m");
}
STRV_FOREACH(env, arg_env) {
r = udev_ctrl_send_set_env(uctrl, *env);
if (r < 0)
return log_error_errno(r, "Failed to send request to update environment: %m");
}
if (arg_max_children >= 0) {
r = udev_ctrl_send_set_children_max(uctrl, arg_max_children);
if (r < 0)
return log_error_errno(r, "Failed to send request to set number of children: %m");
}
if (arg_ping) {
r = udev_ctrl_send_ping(uctrl);
if (r < 0)
return log_error_errno(r, "Failed to send a ping message: %m");
}
r = udev_ctrl_wait(uctrl, arg_timeout);
if (r < 0)
return log_error_errno(r, "Failed to wait for daemon to reply: %m");
return 0;
}
int control_main(int argc, char *argv[], void *userdata) {
int r;
if (running_in_chroot() > 0) {
log_info("Running in chroot, ignoring request.");
return 0;
}
r = parse_argv(argc, argv);
if (r <= 0)
return r;
if (arg_load_credentials) {
static const PickUpCredential table[] = {
{ "udev.conf.", "/run/udev/udev.conf.d/", ".conf" },
{ "udev.rules.", "/run/udev/rules.d/", ".rules" },
};
r = pick_up_credentials(table, ELEMENTSOF(table));
if (r < 0)
return r;
}
if (arg_has_control_commands()) {
r = send_control_commands();
if (r < 0)
return r;
}
return 0;
}
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