/* SPDX-License-Identifier: GPL-2.0+ */ /* * 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 #include #include #include #include #include #include #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-priority=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-priority", required_argument, NULL, 'l' }, { "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' }, {} }; r = must_be_root(); if (r < 0) return r; 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 priority '%s': %m", optarg); r = udev_ctrl_send_set_log_level(uctrl, r); if (r == -ENOANO) log_warning("Cannot specify --log-priority 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 = 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; }