src/udev/udevadm-control.c

   1 /*
   2  * Copyright (C) 2005-2011 Kay Sievers <kay@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <time.h>
  16 #include <errno.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <getopt.h>
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <sys/wait.h>
  26 #include <sys/un.h>
  27
  28 #include "udev.h"
  29 #include "udev-util.h"
  30
  31 static void print_help(void) {
  32         printf("%s control COMMAND\n\n"
  33                "Control the udev daemon.\n\n"
  34                "  -h --help                Show this help\n"
  35                "     --version             Show package version\n"
  36                "  -e --exit                Instruct the daemon to cleanup and exit\n"
  37                "  -l --log-priority=LEVEL  Set the udev log level for the daemon\n"
  38                "  -s --stop-exec-queue     Do not execute events, queue only\n"
  39                "  -S --start-exec-queue    Execute events, flush queue\n"
  40                "  -R --reload              Reload rules and databases\n"
  41                "  -p --property=KEY=VALUE  Set a global property for all events\n"
  42                "  -m --children-max=N      Maximum number of children\n"
  43                "     --timeout=SECONDS     Maximum time to block for a reply\n"
  44                , program_invocation_short_name);
  45 }
  46
  47 static int adm_control(struct udev *udev, int argc, char *argv[]) {
  48         _cleanup_udev_ctrl_unref_ struct udev_ctrl *uctrl = NULL;
  49         int timeout = 60;
  50         int rc = 1, c;
  51
  52         static const struct option options[] = {
  53                 { "exit",             no_argument,       NULL, 'e' },
  54                 { "log-priority",     required_argument, NULL, 'l' },
  55                 { "stop-exec-queue",  no_argument,       NULL, 's' },
  56                 { "start-exec-queue", no_argument,       NULL, 'S' },
  57                 { "reload",           no_argument,       NULL, 'R' },
  58                 { "reload-rules",     no_argument,       NULL, 'R' }, /* alias for -R */
  59                 { "property",         required_argument, NULL, 'p' },
  60                 { "env",              required_argument, NULL, 'p' }, /* alias for -p */
  61                 { "children-max",     required_argument, NULL, 'm' },
  62                 { "timeout",          required_argument, NULL, 't' },
  63                 { "help",             no_argument,       NULL, 'h' },
  64                 {}
  65         };
  66
  67         if (getuid() != 0) {
  68                 fprintf(stderr, "root privileges required\n");
  69                 return 1;
  70         }
  71
  72         uctrl = udev_ctrl_new(udev);
  73         if (uctrl == NULL)
  74                 return 2;
  75
  76         while ((c = getopt_long(argc, argv, "el:sSRp:m:h", options, NULL)) >= 0)
  77                 switch (c) {
  78                 case 'e':
  79                         if (udev_ctrl_send_exit(uctrl, timeout) < 0)
  80                                 rc = 2;
  81                         else
  82                                 rc = 0;
  83                         break;
  84                 case 'l': {
  85                         int i;
  86
  87                         i = util_log_priority(optarg);
  88                         if (i < 0) {
  89                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  90                                 return rc;
  91                         }
  92                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg), timeout) < 0)
  93                                 rc = 2;
  94                         else
  95                                 rc = 0;
  96                         break;
  97                 }
  98                 case 's':
  99                         if (udev_ctrl_send_stop_exec_queue(uctrl, timeout) < 0)
 100                                 rc = 2;
 101                         else
 102                                 rc = 0;
 103                         break;
 104                 case 'S':
 105                         if (udev_ctrl_send_start_exec_queue(uctrl, timeout) < 0)
 106                                 rc = 2;
 107                         else
 108                                 rc = 0;
 109                         break;
 110                 case 'R':
 111                         if (udev_ctrl_send_reload(uctrl, timeout) < 0)
 112                                 rc = 2;
 113                         else
 114                                 rc = 0;
 115                         break;
 116                 case 'p':
 117                         if (strchr(optarg, '=') == NULL) {
 118                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 119                                 return rc;
 120                         }
 121                         if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)
 122                                 rc = 2;
 123                         else
 124                                 rc = 0;
 125                         break;
 126                 case 'm': {
 127                         char *endp;
 128                         int i;
 129
 130                         i = strtoul(optarg, &endp, 0);
 131                         if (endp[0] != '\0' || i < 1) {
 132                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 133                                 return rc;
 134                         }
 135                         if (udev_ctrl_send_set_children_max(uctrl, i, timeout) < 0)
 136                                 rc = 2;
 137                         else
 138                                 rc = 0;
 139                         break;
 140                 }
 141                 case 't': {
 142                         int seconds;
 143
 144                         seconds = atoi(optarg);
 145                         if (seconds >= 0)
 146                                 timeout = seconds;
 147                         else
 148                                 fprintf(stderr, "invalid timeout value\n");
 149                         break;
 150                 }
 151                 case 'h':
 152                         print_help();
 153                         rc = 0;
 154                         break;
 155                 }
 156
 157         if (optind < argc)
 158                 fprintf(stderr, "Extraneous argument: %s\n", argv[optind]);
 159         else if (optind == 1)
 160                 fprintf(stderr, "Option missing\n");
 161         return rc;
 162 }
 163
 164 const struct udevadm_cmd udevadm_control = {
 165         .name = "control",
 166         .cmd = adm_control,
 167         .help = "Control the udev daemon",
 168 };