src/udev/udevadm-trigger.c

   1 /*
   2  * Copyright (C) 2008-2009 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  * 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 *udev = udev_enumerate_get_udev(udev_enumerate);
  42         struct udev_list_entry *entry;
  43
  44         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
  45                 char filename[UTIL_PATH_SIZE];
  46                 int fd;
  47
  48                 if (verbose)
  49                         printf("%s\n", udev_list_entry_get_name(entry));
  50                 if (dry_run)
  51                         continue;
  52                 util_strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
  53                 fd = open(filename, O_WRONLY);
  54                 if (fd < 0) {
  55                         dbg(udev, "error on opening %s: %m\n", filename);
  56                         continue;
  57                 }
  58                 if (write(fd, action, strlen(action)) < 0)
  59                         info(udev, "error writing '%s' to '%s': %m\n", action, filename);
  60                 close(fd);
  61         }
  62 }
  63
  64 static const char *keyval(const char *str, const char **val, char *buf, size_t size)
  65 {
  66         char *pos;
  67
  68         util_strscpy(buf, size,str);
  69         pos = strchr(buf, '=');
  70         if (pos != NULL) {
  71                 pos[0] = 0;
  72                 pos++;
  73         }
  74         *val = pos;
  75         return buf;
  76 }
  77
  78 static int adm_trigger(struct udev *udev, int argc, char *argv[])
  79 {
  80         static const struct option options[] = {
  81                 { "verbose", no_argument, NULL, 'v' },
  82                 { "dry-run", no_argument, NULL, 'n' },
  83                 { "type", required_argument, NULL, 't' },
  84                 { "action", required_argument, NULL, 'c' },
  85                 { "subsystem-match", required_argument, NULL, 's' },
  86                 { "subsystem-nomatch", required_argument, NULL, 'S' },
  87                 { "attr-match", required_argument, NULL, 'a' },
  88                 { "attr-nomatch", required_argument, NULL, 'A' },
  89                 { "property-match", required_argument, NULL, 'p' },
  90                 { "tag-match", required_argument, NULL, 'g' },
  91                 { "sysname-match", required_argument, NULL, 'y' },
  92                 { "parent-match", required_argument, NULL, 'b' },
  93                 { "help", no_argument, NULL, 'h' },
  94                 {}
  95         };
  96         enum {
  97                 TYPE_DEVICES,
  98                 TYPE_SUBSYSTEMS,
  99         } device_type = TYPE_DEVICES;
 100         const char *action = "change";
 101         struct udev_enumerate *udev_enumerate;
 102         int rc = 0;
 103
 104         dbg(udev, "version %s\n", VERSION);
 105         udev_enumerate = udev_enumerate_new(udev);
 106         if (udev_enumerate == NULL) {
 107                 rc = 1;
 108                 goto exit;
 109         }
 110
 111         for (;;) {
 112                 int option;
 113                 const char *key;
 114                 const char *val;
 115                 char buf[UTIL_PATH_SIZE];
 116
 117                 option = getopt_long(argc, argv, "vng:o:t:hc:p:s:S:a:A:y:b:", options, NULL);
 118                 if (option == -1)
 119                         break;
 120
 121                 switch (option) {
 122                 case 'v':
 123                         verbose = 1;
 124                         break;
 125                 case 'n':
 126                         dry_run = 1;
 127                         break;
 128                 case 't':
 129                         if (strcmp(optarg, "devices") == 0) {
 130                                 device_type = TYPE_DEVICES;
 131                         } else if (strcmp(optarg, "subsystems") == 0) {
 132                                 device_type = TYPE_SUBSYSTEMS;
 133                         } else {
 134                                 err(udev, "unknown type --type=%s\n", optarg);
 135                                 rc = 2;
 136                                 goto exit;
 137                         }
 138                         break;
 139                 case 'c':
 140                         action = optarg;
 141                         break;
 142                 case 's':
 143                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 144                         break;
 145                 case 'S':
 146                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 147                         break;
 148                 case 'a':
 149                         key = keyval(optarg, &val, buf, sizeof(buf));
 150                         udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 151                         break;
 152                 case 'A':
 153                         key = keyval(optarg, &val, buf, sizeof(buf));
 154                         udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 155                         break;
 156                 case 'p':
 157                         key = keyval(optarg, &val, buf, sizeof(buf));
 158                         udev_enumerate_add_match_property(udev_enumerate, key, val);
 159                         break;
 160                 case 'g':
 161                         udev_enumerate_add_match_tag(udev_enumerate, optarg);
 162                         break;
 163                 case 'y':
 164                         udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 165                         break;
 166                 case 'b': {
 167                         char path[UTIL_PATH_SIZE];
 168                         struct udev_device *dev;
 169
 170                         /* add sys dir if needed */
 171                         if (strncmp(optarg, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
 172                                 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), optarg, NULL);
 173                         else
 174                                 util_strscpy(path, sizeof(path), optarg);
 175                         util_remove_trailing_chars(path, '/');
 176                         dev = udev_device_new_from_syspath(udev, path);
 177                         if (dev == NULL) {
 178                                 err(udev, "unable to open the device '%s'\n", optarg);
 179                                 rc = 2;
 180                                 goto exit;
 181                         }
 182                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 183                         /* drop reference immediately, enumerate pins the device as long as needed */
 184                         udev_device_unref(dev);
 185                         break;
 186                 }
 187                 case 'h':
 188                         printf("Usage: udevadm trigger OPTIONS\n"
 189                                "  --verbose                       print the list of devices while running\n"
 190                                "  --dry-run                       do not actually trigger the events\n"
 191                                "  --type=                         type of events to trigger\n"
 192                                "      devices                       sys devices (default)\n"
 193                                "      subsystems                    sys subsystems and drivers\n"
 194                                "  --action=<action>               event action value, default is \"change\"\n"
 195                                "  --subsystem-match=<subsystem>   trigger devices from a matching subsystem\n"
 196                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subsystem\n"
 197                                "  --attr-match=<file[=<value>]>   trigger devices with a matching attribute\n"
 198                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
 199                                "  --property-match=<key>=<value>  trigger devices with a matching property\n"
 200                                "  --tag-match=<key>=<value>       trigger devices with a matching property\n"
 201                                "  --sysname-match=<name>          trigger devices with a matching name\n"
 202                                "  --parent-match=<name>           trigger devices with that parent device\n"
 203                                "  --help\n\n");
 204                         goto exit;
 205                 default:
 206                         rc = 1;
 207                         goto exit;
 208                 }
 209         }
 210
 211         switch (device_type) {
 212         case TYPE_SUBSYSTEMS:
 213                 udev_enumerate_scan_subsystems(udev_enumerate);
 214                 exec_list(udev_enumerate, action);
 215                 goto exit;
 216         case TYPE_DEVICES:
 217                 udev_enumerate_scan_devices(udev_enumerate);
 218                 exec_list(udev_enumerate, action);
 219                 goto exit;
 220         default:
 221                 goto exit;
 222         }
 223 exit:
 224         udev_enumerate_unref(udev_enumerate);
 225         return rc;
 226 }
 227
 228 const struct udevadm_cmd udevadm_trigger = {
 229         .name = "trigger",
 230         .cmd = adm_trigger,
 231         .help = "request events from the kernel",
 232 };