src/udev/udevadm-control.c

/*
 * Copyright (C) 2005-2011 Kay Sievers <kay@vrfy.org>
 *
 * 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 <time.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>

#include "udev.h"
#include "udev-util.h"

static void print_help(void)
{
        printf("Usage: udevadm control COMMAND\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"
                "     --timeout=SECONDS      maximum time to block for a reply\n"
                "  -h,--help                 print this help text\n\n");
}

static int adm_control(struct udev *udev, int argc, char *argv[])
{
        _cleanup_udev_ctrl_unref_ struct udev_ctrl *uctrl = NULL;
        int timeout = 60;
        int rc = 1, c;

        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' },
                { "timeout",          required_argument, NULL, 't' },
                { "help",             no_argument,       NULL, 'h' },
                {}
        };

        if (getuid() != 0) {
                fprintf(stderr, "root privileges required\n");
                return 1;
        }

        uctrl = udev_ctrl_new(udev);
        if (uctrl == NULL)
                return 2;

        while ((c = getopt_long(argc, argv, "el:sSRp:m:h", options, NULL)) >= 0)
                switch (c) {
                case 'e':
                        if (udev_ctrl_send_exit(uctrl, timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                case 'l': {
                        int i;

                        i = util_log_priority(optarg);
                        if (i < 0) {
                                fprintf(stderr, "invalid number '%s'\n", optarg);
                                return rc;
                        }
                        if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg), timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                }
                case 's':
                        if (udev_ctrl_send_stop_exec_queue(uctrl, timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                case 'S':
                        if (udev_ctrl_send_start_exec_queue(uctrl, timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                case 'R':
                        if (udev_ctrl_send_reload(uctrl, timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                case 'p':
                        if (strchr(optarg, '=') == NULL) {
                                fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
                                return rc;
                        }
                        if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                case 'm': {
                        char *endp;
                        int i;

                        i = strtoul(optarg, &endp, 0);
                        if (endp[0] != '\0' || i < 1) {
                                fprintf(stderr, "invalid number '%s'\n", optarg);
                                return rc;
                        }
                        if (udev_ctrl_send_set_children_max(uctrl, i, timeout) < 0)
                                rc = 2;
                        else
                                rc = 0;
                        break;
                }
                case 't': {
                        int seconds;

                        seconds = atoi(optarg);
                        if (seconds >= 0)
                                timeout = seconds;
                        else
                                fprintf(stderr, "invalid timeout value\n");
                        break;
                }
                case 'h':
                        print_help();
                        rc = 0;
                        break;
                }

        if (optind < argc)
                fprintf(stderr, "Extraneous argument: %s\n", argv[optind]);
        else if (optind == 1)
                fprintf(stderr, "Option missing\n");
        return rc;
}

const struct udevadm_cmd udevadm_control = {
        .name = "control",
        .cmd = adm_control,
        .help = "control the udev daemon",
};