/* 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 #include #include #include #include #include #include #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_DESTRUCTOR_REGISTER(arg_env, strv_freep); 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; } static int parse_argv(int argc, char *argv[]) { 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' }, {} }; int c, r; assert(argc >= 0); assert(argv); if (argc <= 1) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This command expects one or more options."); 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 = 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 'V': return print_version(); case 'h': return help(); case '?': return -EINVAL; default: assert_not_reached(); } if (optind < argc) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Extraneous argument: %s", argv[optind]); return 1; } int control_main(int argc, char *argv[], void *userdata) { _cleanup_(udev_ctrl_unrefp) UdevCtrl *uctrl = NULL; 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; 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; }