udev/udevadm-control.c

   1 /*
   2  * Copyright (C) 2005-2006 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  *      This program is free software; you can redistribute it and/or modify it
   5  *      under the terms of the GNU General Public License as published by the
   6  *      Free Software Foundation version 2 of the License.
   7  *
   8  *      This program is distributed in the hope that it will be useful, but
   9  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *      General Public License for more details.
  12  *
  13  *      You should have received a copy of the GNU General Public License along
  14  *      with this program; if not, write to the Free Software Foundation, Inc.,
  15  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  *
  17  */
  18
  19 #include "config.h"
  20
  21 #include <time.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <stddef.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <getopt.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <sys/wait.h>
  32 #include <sys/un.h>
  33
  34 #include "udev.h"
  35
  36 static void print_help(void)
  37 {
  38         printf("Usage: udevadm control COMMAND\n"
  39                 "  --log-priority=<level>   set the udev log level for the daemon\n"
  40                 "  --stop-exec-queue        keep udevd from executing events, queue only\n"
  41                 "  --start-exec-queue       execute events, flush queue\n"
  42                 "  --reload-rules           reloads the rules files\n"
  43                 "  --env=<KEY>=<value>      set a global environment variable\n"
  44                 "  --max-childs=<N>         maximum number of childs\n"
  45                 "  --max-childs-running=<N> maximum number of childs running at the same time\n"
  46                 "  --help                   print this help text\n\n");
  47 }
  48
  49 int udevadm_control(struct udev *udev, int argc, char *argv[])
  50 {
  51         struct udev_ctrl *uctrl = NULL;
  52         int rc = 1;
  53
  54         /* compat values with '_' will be removed in a future release */
  55         static const struct option options[] = {
  56                 { "log-priority", 1, NULL, 'l' },
  57                 { "log_priority", 1, NULL, 'l' + 256 },
  58                 { "stop-exec-queue", 0, NULL, 's' },
  59                 { "stop_exec_queue", 0, NULL, 's' + 256 },
  60                 { "start-exec-queue", 0, NULL, 'S' },
  61                 { "start_exec_queue", 0, NULL, 'S' + 256},
  62                 { "reload-rules", 0, NULL, 'R' },
  63                 { "reload_rules", 0, NULL, 'R' + 256},
  64                 { "env", 1, NULL, 'e' },
  65                 { "max-childs", 1, NULL, 'm' },
  66                 { "max_childs", 1, NULL, 'm' + 256},
  67                 { "max-childs-running", 1, NULL, 'M' },
  68                 { "max_childs_running", 1, NULL, 'M' + 256},
  69                 { "help", 0, NULL, 'h' },
  70                 {}
  71         };
  72
  73         if (getuid() != 0) {
  74                 fprintf(stderr, "root privileges required\n");
  75                 goto exit;
  76         }
  77
  78         uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
  79         if (uctrl == NULL)
  80                 goto exit;
  81
  82         while (1) {
  83                 int option;
  84                 int i;
  85                 char *endp;
  86
  87                 option = getopt_long(argc, argv, "l:sSRe:m:M:h", options, NULL);
  88                 if (option == -1)
  89                         break;
  90
  91                 if (option > 255) {
  92                         fprintf(stderr, "udevadm control expects commands without underscore, "
  93                                 "this will stop working in a future release\n");
  94                         err(udev, "udevadm control expects commands without underscore, "
  95                             "this will stop working in a future release\n");
  96                 }
  97
  98                 switch (option) {
  99                 case 'l':
 100                 case 'l' + 256:
 101                         i = log_priority(optarg);
 102                         if (i < 0) {
 103                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 104                                 goto exit;
 105                         }
 106                         udev_ctrl_send_set_log_level(uctrl, log_priority(optarg));
 107                         rc = 0;
 108                         break;
 109                 case 's':
 110                 case 's' + 256:
 111                         udev_ctrl_send_stop_exec_queue(uctrl);
 112                         rc = 0;
 113                         break;
 114                 case 'S':
 115                 case 'S' + 256:
 116                         udev_ctrl_send_start_exec_queue(uctrl);
 117                         rc = 0;
 118                         break;
 119                 case 'R':
 120                 case 'R' + 256:
 121                         udev_ctrl_send_reload_rules(uctrl);
 122                         rc = 0;
 123                         break;
 124                 case 'e':
 125                         if (strchr(optarg, '=') == NULL) {
 126                                 fprintf(stderr, "expect <KEY>=<valaue> instead of '%s'\n", optarg);
 127                                 goto exit;
 128                         }
 129                         udev_ctrl_send_set_env(uctrl, optarg);
 130                         rc = 0;
 131                         break;
 132                 case 'm':
 133                 case 'm' + 256:
 134                         i = strtoul(optarg, &endp, 0);
 135                         if (endp[0] != '\0' || i < 1) {
 136                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 137                                 goto exit;
 138                         }
 139                         udev_ctrl_send_set_max_childs(uctrl, i);
 140                         rc = 0;
 141                         break;
 142                 case 'M':
 143                 case 'M' + 256:
 144                         i = strtoul(optarg, &endp, 0);
 145                         if (endp[0] != '\0' || i < 1) {
 146                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 147                                 goto exit;
 148                         }
 149                         udev_ctrl_send_set_max_childs_running(uctrl, i);
 150                         rc = 0;
 151                         break;
 152                 case 'h':
 153                         print_help();
 154                         rc = 0;
 155                         goto exit;
 156                 default:
 157                         goto exit;
 158                 }
 159         }
 160
 161         /* compat stuff which will be removed in a future release */
 162         if (argv[optind] != NULL) {
 163                 const char *arg = argv[optind];
 164
 165                 fprintf(stderr, "udevadm control commands requires the --<command> format, "
 166                         "this will stop working in a future release\n");
 167                 err(udev, "udevadm control commands requires the --<command> format, "
 168                     "this will stop working in a future release\n");
 169
 170                 if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
 171                         udev_ctrl_send_set_log_level(uctrl, log_priority(&arg[strlen("log_priority=")]));
 172                         rc = 0;
 173                         goto exit;
 174                 } else if (!strcmp(arg, "stop_exec_queue")) {
 175                         udev_ctrl_send_stop_exec_queue(uctrl);
 176                         rc = 0;
 177                         goto exit;
 178                 } else if (!strcmp(arg, "start_exec_queue")) {
 179                         udev_ctrl_send_start_exec_queue(uctrl);
 180                         rc = 0;
 181                         goto exit;
 182                 } else if (!strcmp(arg, "reload_rules")) {
 183                         udev_ctrl_send_reload_rules(uctrl);
 184                         rc = 0;
 185                         goto exit;
 186                 } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
 187                         udev_ctrl_send_set_max_childs(uctrl, strtoul(&arg[strlen("max_childs=")], NULL, 0));
 188                         rc = 0;
 189                         goto exit;
 190                 } else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
 191                         udev_ctrl_send_set_max_childs_running(uctrl, strtoul(&arg[strlen("max_childs_running=")], NULL, 0));
 192                         rc = 0;
 193                         goto exit;
 194                 } else if (!strncmp(arg, "env", strlen("env"))) {
 195                         udev_ctrl_send_set_env(uctrl, &arg[strlen("env=")]);
 196                         rc = 0;
 197                         goto exit;
 198                 }
 199         }
 200
 201         if (rc != 0) {
 202                 fprintf(stderr, "unrecognized command\n");
 203                 err(udev, "unrecognized command\n");
 204         }
 205 exit:
 206         udev_ctrl_unref(uctrl);
 207         return rc;
 208 }