udev/udevadm-control.c

   1 /*
   2  * Copyright (C) 2005-2008 Kay Sievers <kay.sievers@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 "config.h"
  16
  17 #include <time.h>
  18 #include <errno.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <getopt.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <sys/wait.h>
  28 #include <sys/un.h>
  29
  30 #include "udev.h"
  31
  32 static void print_help(void)
  33 {
  34         printf("Usage: udevadm control COMMAND\n"
  35                 "  --log-priority=<level>   set the udev log level for the daemon\n"
  36                 "  --stop-exec-queue        keep udevd from executing events, queue only\n"
  37                 "  --start-exec-queue       execute events, flush queue\n"
  38                 "  --reload-rules           reloads the rules files\n"
  39                 "  --env=<KEY>=<value>      set a global environment variable\n"
  40                 "  --max-childs=<N>         maximum number of childs\n"
  41                 "  --help                   print this help text\n\n");
  42 }
  43
  44 int udevadm_control(struct udev *udev, int argc, char *argv[])
  45 {
  46         struct udev_ctrl *uctrl = NULL;
  47         int rc = 1;
  48
  49         /* compat values with '_' will be removed in a future release */
  50         static const struct option options[] = {
  51                 { "log-priority", 1, NULL, 'l' },
  52                 { "log_priority", 1, NULL, 'l' + 256 },
  53                 { "stop-exec-queue", 0, NULL, 's' },
  54                 { "stop_exec_queue", 0, NULL, 's' + 256 },
  55                 { "start-exec-queue", 0, NULL, 'S' },
  56                 { "start_exec_queue", 0, NULL, 'S' + 256},
  57                 { "reload-rules", 0, NULL, 'R' },
  58                 { "reload_rules", 0, NULL, 'R' + 256},
  59                 { "env", 1, NULL, 'e' },
  60                 { "max-childs", 1, NULL, 'm' },
  61                 { "max_childs", 1, NULL, 'm' + 256},
  62                 { "help", 0, NULL, 'h' },
  63                 {}
  64         };
  65
  66         if (getuid() != 0) {
  67                 fprintf(stderr, "root privileges required\n");
  68                 goto exit;
  69         }
  70
  71         uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
  72         if (uctrl == NULL)
  73                 goto exit;
  74
  75         while (1) {
  76                 int option;
  77                 int i;
  78                 char *endp;
  79
  80                 option = getopt_long(argc, argv, "l:sSRe:m:M:h", options, NULL);
  81                 if (option == -1)
  82                         break;
  83
  84                 if (option > 255) {
  85                         fprintf(stderr, "udevadm control expects commands without underscore, "
  86                                 "this will stop working in a future release\n");
  87                         err(udev, "udevadm control expects commands without underscore, "
  88                             "this will stop working in a future release\n");
  89                 }
  90
  91                 switch (option) {
  92                 case 'l':
  93                 case 'l' + 256:
  94                         i = util_log_priority(optarg);
  95                         if (i < 0) {
  96                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  97                                 goto exit;
  98                         }
  99                         udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg));
 100                         rc = 0;
 101                         break;
 102                 case 's':
 103                 case 's' + 256:
 104                         udev_ctrl_send_stop_exec_queue(uctrl);
 105                         rc = 0;
 106                         break;
 107                 case 'S':
 108                 case 'S' + 256:
 109                         udev_ctrl_send_start_exec_queue(uctrl);
 110                         rc = 0;
 111                         break;
 112                 case 'R':
 113                 case 'R' + 256:
 114                         udev_ctrl_send_reload_rules(uctrl);
 115                         rc = 0;
 116                         break;
 117                 case 'e':
 118                         if (strchr(optarg, '=') == NULL) {
 119                                 fprintf(stderr, "expect <KEY>=<valaue> instead of '%s'\n", optarg);
 120                                 goto exit;
 121                         }
 122                         udev_ctrl_send_set_env(uctrl, optarg);
 123                         rc = 0;
 124                         break;
 125                 case 'm':
 126                 case 'm' + 256:
 127                         i = strtoul(optarg, &endp, 0);
 128                         if (endp[0] != '\0' || i < 1) {
 129                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 130                                 goto exit;
 131                         }
 132                         udev_ctrl_send_set_max_childs(uctrl, i);
 133                         rc = 0;
 134                         break;
 135                 case 'h':
 136                         print_help();
 137                         rc = 0;
 138                         goto exit;
 139                 default:
 140                         goto exit;
 141                 }
 142         }
 143
 144         /* compat stuff which will be removed in a future release */
 145         if (argv[optind] != NULL) {
 146                 const char *arg = argv[optind];
 147
 148                 fprintf(stderr, "udevadm control commands requires the --<command> format, "
 149                         "this will stop working in a future release\n");
 150                 err(udev, "udevadm control commands requires the --<command> format, "
 151                     "this will stop working in a future release\n");
 152
 153                 if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
 154                         udev_ctrl_send_set_log_level(uctrl, util_log_priority(&arg[strlen("log_priority=")]));
 155                         rc = 0;
 156                         goto exit;
 157                 } else if (!strcmp(arg, "stop_exec_queue")) {
 158                         udev_ctrl_send_stop_exec_queue(uctrl);
 159                         rc = 0;
 160                         goto exit;
 161                 } else if (!strcmp(arg, "start_exec_queue")) {
 162                         udev_ctrl_send_start_exec_queue(uctrl);
 163                         rc = 0;
 164                         goto exit;
 165                 } else if (!strcmp(arg, "reload_rules")) {
 166                         udev_ctrl_send_reload_rules(uctrl);
 167                         rc = 0;
 168                         goto exit;
 169                 } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
 170                         udev_ctrl_send_set_max_childs(uctrl, strtoul(&arg[strlen("max_childs=")], NULL, 0));
 171                         rc = 0;
 172                         goto exit;
 173                 } else if (!strncmp(arg, "env", strlen("env"))) {
 174                         udev_ctrl_send_set_env(uctrl, &arg[strlen("env=")]);
 175                         rc = 0;
 176                         goto exit;
 177                 }
 178         }
 179
 180         if (rc != 0) {
 181                 fprintf(stderr, "unrecognized command\n");
 182                 err(udev, "unrecognized command\n");
 183         }
 184 exit:
 185         udev_ctrl_unref(uctrl);
 186         return rc;
 187 }