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                 "  --property=<KEY>=<value> set a global property for all events\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                 { "property", required_argument, NULL, 'p' },
  58                 { "env", required_argument, NULL, 'p' },
  59                 { "max-childs", required_argument, NULL, 'm' },
  60                 { "max_childs", required_argument, NULL, 'm' + 256},
  61                 { "help", no_argument, NULL, 'h' },
  62                 {}
  63         };
  64
  65         if (getuid() != 0) {
  66                 fprintf(stderr, "root privileges required\n");
  67                 goto exit;
  68         }
  69
  70         uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
  71         if (uctrl == NULL)
  72                 goto exit;
  73
  74         while (1) {
  75                 int option;
  76                 int i;
  77                 char *endp;
  78
  79                 option = getopt_long(argc, argv, "l:sSRp:m:M:h", options, NULL);
  80                 if (option == -1)
  81                         break;
  82
  83                 if (option > 255) {
  84                         err(udev, "udevadm control expects commands without underscore, "
  85                             "this will stop working in a future release\n");
  86                 }
  87
  88                 switch (option) {
  89                 case 'l':
  90                 case 'l' + 256:
  91                         i = util_log_priority(optarg);
  92                         if (i < 0) {
  93                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  94                                 goto exit;
  95                         }
  96                         udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg));
  97                         rc = 0;
  98                         break;
  99                 case 's':
 100                 case 's' + 256:
 101                         udev_ctrl_send_stop_exec_queue(uctrl);
 102                         rc = 0;
 103                         break;
 104                 case 'S':
 105                 case 'S' + 256:
 106                         udev_ctrl_send_start_exec_queue(uctrl);
 107                         rc = 0;
 108                         break;
 109                 case 'R':
 110                 case 'R' + 256:
 111                         udev_ctrl_send_reload_rules(uctrl);
 112                         rc = 0;
 113                         break;
 114                 case 'p':
 115                         if (strchr(optarg, '=') == NULL) {
 116                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 117                                 goto exit;
 118                         }
 119                         udev_ctrl_send_set_env(uctrl, optarg);
 120                         rc = 0;
 121                         break;
 122                 case 'm':
 123                 case 'm' + 256:
 124                         i = strtoul(optarg, &endp, 0);
 125                         if (endp[0] != '\0' || i < 1) {
 126                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 127                                 goto exit;
 128                         }
 129                         udev_ctrl_send_set_max_childs(uctrl, i);
 130                         rc = 0;
 131                         break;
 132                 case 'h':
 133                         print_help();
 134                         rc = 0;
 135                         goto exit;
 136                 default:
 137                         goto exit;
 138                 }
 139         }
 140
 141         /* compat stuff which will be removed in a future release */
 142         if (argv[optind] != NULL) {
 143                 const char *arg = argv[optind];
 144
 145                 err(udev, "udevadm control commands requires the --<command> format, "
 146                     "this will stop working in a future release\n");
 147
 148                 if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
 149                         udev_ctrl_send_set_log_level(uctrl, util_log_priority(&arg[strlen("log_priority=")]));
 150                         rc = 0;
 151                         goto exit;
 152                 } else if (!strcmp(arg, "stop_exec_queue")) {
 153                         udev_ctrl_send_stop_exec_queue(uctrl);
 154                         rc = 0;
 155                         goto exit;
 156                 } else if (!strcmp(arg, "start_exec_queue")) {
 157                         udev_ctrl_send_start_exec_queue(uctrl);
 158                         rc = 0;
 159                         goto exit;
 160                 } else if (!strcmp(arg, "reload_rules")) {
 161                         udev_ctrl_send_reload_rules(uctrl);
 162                         rc = 0;
 163                         goto exit;
 164                 } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
 165                         udev_ctrl_send_set_max_childs(uctrl, strtoul(&arg[strlen("max_childs=")], NULL, 0));
 166                         rc = 0;
 167                         goto exit;
 168                 } else if (!strncmp(arg, "env", strlen("env"))) {
 169                         udev_ctrl_send_set_env(uctrl, &arg[strlen("env=")]);
 170                         rc = 0;
 171                         goto exit;
 172                 }
 173         }
 174
 175         if (rc != 0) {
 176                 err(udev, "unrecognized command\n");
 177         }
 178 exit:
 179         udev_ctrl_unref(uctrl);
 180         return rc;
 181 }