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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <errno.h>
#include <getopt.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "parse-util.h"
#include "process-util.h"
#include "syslog-util.h"
#include "time-util.h"
#include "udevadm.h"
#include "udev-ctrl.h"
#include "util.h"
#include "virt.h"
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"
, program_invocation_short_name);
return 0;
}
int control_main(int argc, char *argv[], void *userdata) {
_cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
usec_t timeout = 60 * USEC_PER_SEC;
int c, r;
enum {
ARG_PING = 0x100,
};
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' },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{}
};
if (running_in_chroot() > 0) {
log_info("Running in chroot, ignoring request.");
return 0;
}
if (argc <= 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This command expects one or more options.");
r = udev_ctrl_new(&uctrl);
if (r < 0)
return log_error_errno(r, "Failed to initialize udev control: %m");
while ((c = getopt_long(argc, argv, "el:sSRp:m:t:Vh", options, NULL)) >= 0)
switch (c) {
case 'e':
r = udev_ctrl_send_exit(uctrl);
if (r == -ENOANO)
log_warning("Cannot specify --exit after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send exit request: %m");
break;
case 'l':
r = log_level_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse log level '%s': %m", optarg);
r = udev_ctrl_send_set_log_level(uctrl, r);
if (r == -ENOANO)
log_warning("Cannot specify --log-level after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send request to set log level: %m");
break;
case 's':
r = udev_ctrl_send_stop_exec_queue(uctrl);
if (r == -ENOANO)
log_warning("Cannot specify --stop-exec-queue after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send request to stop exec queue: %m");
break;
case 'S':
r = udev_ctrl_send_start_exec_queue(uctrl);
if (r == -ENOANO)
log_warning("Cannot specify --start-exec-queue after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send request to start exec queue: %m");
break;
case 'R':
r = udev_ctrl_send_reload(uctrl);
if (r == -ENOANO)
log_warning("Cannot specify --reload after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send reload request: %m");
break;
case 'p':
if (!strchr(optarg, '='))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "expect <KEY>=<value> instead of '%s'", optarg);
r = udev_ctrl_send_set_env(uctrl, optarg);
if (r == -ENOANO)
log_warning("Cannot specify --property after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send request to update 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 events '%s': %m", optarg);
r = udev_ctrl_send_set_children_max(uctrl, i);
if (r == -ENOANO)
log_warning("Cannot specify --children-max after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send request to set number of children: %m");
break;
}
case ARG_PING:
r = udev_ctrl_send_ping(uctrl);
if (r == -ENOANO)
log_error("Cannot specify --ping after --exit, ignoring.");
else if (r < 0)
return log_error_errno(r, "Failed to send a ping message: %m");
break;
case 't':
r = parse_sec(optarg, &timeout);
if (r < 0)
return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
break;
case 'V':
return print_version();
case 'h':
return help();
case '?':
return -EINVAL;
default:
assert_not_reached("Unknown option.");
}
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Extraneous argument: %s", argv[optind]);
r = udev_ctrl_wait(uctrl, timeout);
if (r < 0)
return log_error_errno(r, "Failed to wait for daemon to reply: %m");
return 0;
}
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