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