src/udev/udevadm-trigger.c

   1 /*
   2  * Copyright (C) 2008-2009 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  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <getopt.h>
  24 #include <errno.h>
  25 #include <dirent.h>
  26 #include <fcntl.h>
  27 #include <syslog.h>
  28 #include <fnmatch.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33
  34 #include "udev.h"
  35
  36 static int verbose;
  37 static int dry_run;
  38
  39 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action)
  40 {
  41         struct udev_list_entry *entry;
  42
  43         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
  44                 char filename[UTIL_PATH_SIZE];
  45                 int fd;
  46
  47                 if (verbose)
  48                         printf("%s\n", udev_list_entry_get_name(entry));
  49                 if (dry_run)
  50                         continue;
  51                 strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
  52                 fd = open(filename, O_WRONLY);
  53                 if (fd < 0)
  54                         continue;
  55                 if (write(fd, action, strlen(action)) < 0)
  56                         log_debug("error writing '%s' to '%s': %m\n", action, filename);
  57                 close(fd);
  58         }
  59 }
  60
  61 static const char *keyval(const char *str, const char **val, char *buf, size_t size)
  62 {
  63         char *pos;
  64
  65         strscpy(buf, size,str);
  66         pos = strchr(buf, '=');
  67         if (pos != NULL) {
  68                 pos[0] = 0;
  69                 pos++;
  70         }
  71         *val = pos;
  72         return buf;
  73 }
  74
  75 static int adm_trigger(struct udev *udev, int argc, char *argv[])
  76 {
  77         static const struct option options[] = {
  78                 { "verbose", no_argument, NULL, 'v' },
  79                 { "dry-run", no_argument, NULL, 'n' },
  80                 { "type", required_argument, NULL, 't' },
  81                 { "action", required_argument, NULL, 'c' },
  82                 { "subsystem-match", required_argument, NULL, 's' },
  83                 { "subsystem-nomatch", required_argument, NULL, 'S' },
  84                 { "attr-match", required_argument, NULL, 'a' },
  85                 { "attr-nomatch", required_argument, NULL, 'A' },
  86                 { "property-match", required_argument, NULL, 'p' },
  87                 { "tag-match", required_argument, NULL, 'g' },
  88                 { "sysname-match", required_argument, NULL, 'y' },
  89                 { "parent-match", required_argument, NULL, 'b' },
  90                 { "help", no_argument, NULL, 'h' },
  91                 {}
  92         };
  93         enum {
  94                 TYPE_DEVICES,
  95                 TYPE_SUBSYSTEMS,
  96         } device_type = TYPE_DEVICES;
  97         const char *action = "change";
  98         struct udev_enumerate *udev_enumerate;
  99         int rc = 0;
 100
 101         udev_enumerate = udev_enumerate_new(udev);
 102         if (udev_enumerate == NULL) {
 103                 rc = 1;
 104                 goto exit;
 105         }
 106
 107         for (;;) {
 108                 int option;
 109                 const char *key;
 110                 const char *val;
 111                 char buf[UTIL_PATH_SIZE];
 112
 113                 option = getopt_long(argc, argv, "vng:o:t:hc:p:s:S:a:A:y:b:", options, NULL);
 114                 if (option == -1)
 115                         break;
 116
 117                 switch (option) {
 118                 case 'v':
 119                         verbose = 1;
 120                         break;
 121                 case 'n':
 122                         dry_run = 1;
 123                         break;
 124                 case 't':
 125                         if (streq(optarg, "devices")) {
 126                                 device_type = TYPE_DEVICES;
 127                         } else if (streq(optarg, "subsystems")) {
 128                                 device_type = TYPE_SUBSYSTEMS;
 129                         } else {
 130                                 log_error("unknown type --type=%s\n", optarg);
 131                                 rc = 2;
 132                                 goto exit;
 133                         }
 134                         break;
 135                 case 'c':
 136                         action = optarg;
 137                         break;
 138                 case 's':
 139                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 140                         break;
 141                 case 'S':
 142                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 143                         break;
 144                 case 'a':
 145                         key = keyval(optarg, &val, buf, sizeof(buf));
 146                         udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 147                         break;
 148                 case 'A':
 149                         key = keyval(optarg, &val, buf, sizeof(buf));
 150                         udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 151                         break;
 152                 case 'p':
 153                         key = keyval(optarg, &val, buf, sizeof(buf));
 154                         udev_enumerate_add_match_property(udev_enumerate, key, val);
 155                         break;
 156                 case 'g':
 157                         udev_enumerate_add_match_tag(udev_enumerate, optarg);
 158                         break;
 159                 case 'y':
 160                         udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 161                         break;
 162                 case 'b': {
 163                         char path[UTIL_PATH_SIZE];
 164                         struct udev_device *dev;
 165
 166                         /* add sys dir if needed */
 167                         if (!startswith(optarg, "/sys"))
 168                                 strscpyl(path, sizeof(path), "/sys", optarg, NULL);
 169                         else
 170                                 strscpy(path, sizeof(path), optarg);
 171                         util_remove_trailing_chars(path, '/');
 172                         dev = udev_device_new_from_syspath(udev, path);
 173                         if (dev == NULL) {
 174                                 log_error("unable to open the device '%s'\n", optarg);
 175                                 rc = 2;
 176                                 goto exit;
 177                         }
 178                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 179                         /* drop reference immediately, enumerate pins the device as long as needed */
 180                         udev_device_unref(dev);
 181                         break;
 182                 }
 183                 case 'h':
 184                         printf("Usage: udevadm trigger OPTIONS\n"
 185                                "  --verbose                       print the list of devices while running\n"
 186                                "  --dry-run                       do not actually trigger the events\n"
 187                                "  --type=                         type of events to trigger\n"
 188                                "      devices                       sys devices (default)\n"
 189                                "      subsystems                    sys subsystems and drivers\n"
 190                                "  --action=<action>               event action value, default is \"change\"\n"
 191                                "  --subsystem-match=<subsystem>   trigger devices from a matching subsystem\n"
 192                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subsystem\n"
 193                                "  --attr-match=<file[=<value>]>   trigger devices with a matching attribute\n"
 194                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
 195                                "  --property-match=<key>=<value>  trigger devices with a matching property\n"
 196                                "  --tag-match=<key>=<value>       trigger devices with a matching property\n"
 197                                "  --sysname-match=<name>          trigger devices with a matching name\n"
 198                                "  --parent-match=<name>           trigger devices with that parent device\n"
 199                                "  --help\n\n");
 200                         goto exit;
 201                 default:
 202                         rc = 1;
 203                         goto exit;
 204                 }
 205         }
 206
 207         switch (device_type) {
 208         case TYPE_SUBSYSTEMS:
 209                 udev_enumerate_scan_subsystems(udev_enumerate);
 210                 exec_list(udev_enumerate, action);
 211                 goto exit;
 212         case TYPE_DEVICES:
 213                 udev_enumerate_scan_devices(udev_enumerate);
 214                 exec_list(udev_enumerate, action);
 215                 goto exit;
 216         default:
 217                 assert_not_reached("device_type");
 218         }
 219 exit:
 220         udev_enumerate_unref(udev_enumerate);
 221         return rc;
 222 }
 223
 224 const struct udevadm_cmd udevadm_trigger = {
 225         .name = "trigger",
 226         .cmd = adm_trigger,
 227         .help = "request events from the kernel",
 228 };