src/udev/udevadm-control.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * This program is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <errno.h>
  15 #include <getopt.h>
  16 #include <stddef.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21
  22 #include "parse-util.h"
  23 #include "process-util.h"
  24 #include "syslog-util.h"
  25 #include "time-util.h"
  26 #include "udevadm.h"
  27 #include "udev-ctrl.h"
  28 #include "util.h"
  29
  30 static int help(void) {
  31         printf("%s control OPTION\n\n"
  32                "Control the udev daemon.\n\n"
  33                "  -h --help                Show this help\n"
  34                "  -V --version             Show package version\n"
  35                "  -e --exit                Instruct the daemon to cleanup and exit\n"
  36                "  -l --log-priority=LEVEL  Set the udev log level for the daemon\n"
  37                "  -s --stop-exec-queue     Do not execute events, queue only\n"
  38                "  -S --start-exec-queue    Execute events, flush queue\n"
  39                "  -R --reload              Reload rules and databases\n"
  40                "  -p --property=KEY=VALUE  Set a global property for all events\n"
  41                "  -m --children-max=N      Maximum number of children\n"
  42                "  -t --timeout=SECONDS     Maximum time to block for a reply\n"
  43                , program_invocation_short_name);
  44
  45         return 0;
  46 }
  47
  48 int control_main(int argc, char *argv[], void *userdata) {
  49         _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
  50         int timeout = 60;
  51         int c, r;
  52
  53         static const struct option options[] = {
  54                 { "exit",             no_argument,       NULL, 'e' },
  55                 { "log-priority",     required_argument, NULL, 'l' },
  56                 { "stop-exec-queue",  no_argument,       NULL, 's' },
  57                 { "start-exec-queue", no_argument,       NULL, 'S' },
  58                 { "reload",           no_argument,       NULL, 'R' },
  59                 { "reload-rules",     no_argument,       NULL, 'R' }, /* alias for -R */
  60                 { "property",         required_argument, NULL, 'p' },
  61                 { "env",              required_argument, NULL, 'p' }, /* alias for -p */
  62                 { "children-max",     required_argument, NULL, 'm' },
  63                 { "timeout",          required_argument, NULL, 't' },
  64                 { "version",          no_argument,       NULL, 'V' },
  65                 { "help",             no_argument,       NULL, 'h' },
  66                 {}
  67         };
  68
  69         r = must_be_root();
  70         if (r < 0)
  71                 return r;
  72
  73         if (argc <= 1)
  74                 log_error("Option missing");
  75
  76         uctrl = udev_ctrl_new();
  77         if (!uctrl)
  78                 return -ENOMEM;
  79
  80         while ((c = getopt_long(argc, argv, "el:sSRp:m:t:Vh", options, NULL)) >= 0)
  81                 switch (c) {
  82                 case 'e':
  83                         r = udev_ctrl_send_exit(uctrl, timeout);
  84                         if (r < 0)
  85                                 return r;
  86                         break;
  87                 case 'l':
  88                         r = log_level_from_string(optarg);
  89                         if (r < 0)
  90                                 return log_error_errno(r, "Failed to parse log priority '%s': %m", optarg);
  91
  92                         r = udev_ctrl_send_set_log_level(uctrl, r, timeout);
  93                         if (r < 0)
  94                                 return r;
  95                         break;
  96                 case 's':
  97                         r = udev_ctrl_send_stop_exec_queue(uctrl, timeout);
  98                         if (r < 0)
  99                                 return r;
 100                         break;
 101                 case 'S':
 102                         r = udev_ctrl_send_start_exec_queue(uctrl, timeout);
 103                         if (r < 0)
 104                                 return r;
 105                         break;
 106                 case 'R':
 107                         r = udev_ctrl_send_reload(uctrl, timeout);
 108                         if (r < 0)
 109                                 return r;
 110                         break;
 111                 case 'p':
 112                         if (!strchr(optarg, '=')) {
 113                                 log_error("expect <KEY>=<value> instead of '%s'", optarg);
 114                                 return -EINVAL;
 115                         }
 116                         r = udev_ctrl_send_set_env(uctrl, optarg, timeout);
 117                         if (r < 0)
 118                                 return r;
 119                         break;
 120                 case 'm': {
 121                         unsigned i;
 122
 123                         r = safe_atou(optarg, &i);
 124                         if (r < 0)
 125                                 return log_error_errno(r, "Failed to parse maximum number of events '%s': %m", optarg);
 126
 127                         r = udev_ctrl_send_set_children_max(uctrl, i, timeout);
 128                         if (r < 0)
 129                                 return r;
 130                         break;
 131                 }
 132                 case 't': {
 133                         usec_t s;
 134
 135                         r = parse_sec(optarg, &s);
 136                         if (r < 0)
 137                                 return log_error_errno(r, "Failed to parse timeout value '%s'.", optarg);
 138
 139                         if (DIV_ROUND_UP(s, USEC_PER_SEC) > INT_MAX)
 140                                 log_error("Timeout value is out of range, ignoring.");
 141                         else
 142                                 timeout = s != USEC_INFINITY ? (int) DIV_ROUND_UP(s, USEC_PER_SEC) : INT_MAX;
 143                         break;
 144                 }
 145                 case 'V':
 146                         return print_version();
 147                 case 'h':
 148                         return help();
 149                 case '?':
 150                         return -EINVAL;
 151                 default:
 152                         assert_not_reached("Unknown option.");
 153                 }
 154
 155         if (optind < argc) {
 156                 log_error("Extraneous argument: %s", argv[optind]);
 157                 return -EINVAL;
 158         } else if (optind == 1) {
 159                 log_error("Option missing");
 160                 return -EINVAL;
 161         }
 162
 163         return 0;
 164 }