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("Usage: udevadm control COMMAND\n"
  33                 "  -e,--exit                 instruct the daemon to cleanup and exit\n"
  34                 "  -l,--log-priority=LEVEL   set the udev log level for the daemon\n"
  35                 "  -s,--stop-exec-queue      do not execute events, queue only\n"
  36                 "  -S,--start-exec-queue     execute events, flush queue\n"
  37                 "  -R,--reload               reload rules and databases\n"
  38                 "  -p,--property=KEY=VALUE   set a global property for all events\n"
  39                 "  -m,--children-max=N       maximum number of children\n"
  40                 "     --timeout=SECONDS      maximum time to block for a reply\n"
  41                 "  -h,--help                 print this help text\n\n");
  42 }
  43
  44 static int adm_control(struct udev *udev, int argc, char *argv[]) {
  45         _cleanup_udev_ctrl_unref_ struct udev_ctrl *uctrl = NULL;
  46         int timeout = 60;
  47         int rc = 1, c;
  48
  49         static const struct option options[] = {
  50                 { "exit",             no_argument,       NULL, 'e' },
  51                 { "log-priority",     required_argument, NULL, 'l' },
  52                 { "stop-exec-queue",  no_argument,       NULL, 's' },
  53                 { "start-exec-queue", no_argument,       NULL, 'S' },
  54                 { "reload",           no_argument,       NULL, 'R' },
  55                 { "reload-rules",     no_argument,       NULL, 'R' }, /* alias for -R */
  56                 { "property",         required_argument, NULL, 'p' },
  57                 { "env",              required_argument, NULL, 'p' }, /* alias for -p */
  58                 { "children-max",     required_argument, NULL, 'm' },
  59                 { "timeout",          required_argument, NULL, 't' },
  60                 { "help",             no_argument,       NULL, 'h' },
  61                 {}
  62         };
  63
  64         if (getuid() != 0) {
  65                 fprintf(stderr, "root privileges required\n");
  66                 return 1;
  67         }
  68
  69         uctrl = udev_ctrl_new(udev);
  70         if (uctrl == NULL)
  71                 return 2;
  72
  73         while ((c = getopt_long(argc, argv, "el:sSRp:m:h", options, NULL)) >= 0)
  74                 switch (c) {
  75                 case 'e':
  76                         if (udev_ctrl_send_exit(uctrl, timeout) < 0)
  77                                 rc = 2;
  78                         else
  79                                 rc = 0;
  80                         break;
  81                 case 'l': {
  82                         int i;
  83
  84                         i = util_log_priority(optarg);
  85                         if (i < 0) {
  86                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  87                                 return rc;
  88                         }
  89                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg), timeout) < 0)
  90                                 rc = 2;
  91                         else
  92                                 rc = 0;
  93                         break;
  94                 }
  95                 case 's':
  96                         if (udev_ctrl_send_stop_exec_queue(uctrl, timeout) < 0)
  97                                 rc = 2;
  98                         else
  99                                 rc = 0;
 100                         break;
 101                 case 'S':
 102                         if (udev_ctrl_send_start_exec_queue(uctrl, timeout) < 0)
 103                                 rc = 2;
 104                         else
 105                                 rc = 0;
 106                         break;
 107                 case 'R':
 108                         if (udev_ctrl_send_reload(uctrl, timeout) < 0)
 109                                 rc = 2;
 110                         else
 111                                 rc = 0;
 112                         break;
 113                 case 'p':
 114                         if (strchr(optarg, '=') == NULL) {
 115                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 116                                 return rc;
 117                         }
 118                         if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)
 119                                 rc = 2;
 120                         else
 121                                 rc = 0;
 122                         break;
 123                 case 'm': {
 124                         char *endp;
 125                         int i;
 126
 127                         i = strtoul(optarg, &endp, 0);
 128                         if (endp[0] != '\0' || i < 1) {
 129                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 130                                 return rc;
 131                         }
 132                         if (udev_ctrl_send_set_children_max(uctrl, i, timeout) < 0)
 133                                 rc = 2;
 134                         else
 135                                 rc = 0;
 136                         break;
 137                 }
 138                 case 't': {
 139                         int seconds;
 140
 141                         seconds = atoi(optarg);
 142                         if (seconds >= 0)
 143                                 timeout = seconds;
 144                         else
 145                                 fprintf(stderr, "invalid timeout value\n");
 146                         break;
 147                 }
 148                 case 'h':
 149                         print_help();
 150                         rc = 0;
 151                         break;
 152                 }
 153
 154         if (optind < argc)
 155                 fprintf(stderr, "Extraneous argument: %s\n", argv[optind]);
 156         else if (optind == 1)
 157                 fprintf(stderr, "Option missing\n");
 158         return rc;
 159 }
 160
 161 const struct udevadm_cmd udevadm_control = {
 162         .name = "control",
 163         .cmd = adm_control,
 164         .help = "control the udev daemon",
 165 };