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 #include "util.h"
  36
  37 static int verbose;
  38 static int dry_run;
  39
  40 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action)
  41 {
  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                 strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
  53                 fd = open(filename, O_WRONLY);
  54                 if (fd < 0)
  55                         continue;
  56                 if (write(fd, action, strlen(action)) < 0)
  57                         log_debug("error writing '%s' to '%s': %m\n", action, filename);
  58                 close(fd);
  59         }
  60 }
  61
  62 static const char *keyval(const char *str, const char **val, char *buf, size_t size)
  63 {
  64         char *pos;
  65
  66         strscpy(buf, size,str);
  67         pos = strchr(buf, '=');
  68         if (pos != NULL) {
  69                 pos[0] = 0;
  70                 pos++;
  71         }
  72         *val = pos;
  73         return buf;
  74 }
  75
  76 static int adm_trigger(struct udev *udev, int argc, char *argv[])
  77 {
  78         static const struct option options[] = {
  79                 { "verbose", no_argument, NULL, 'v' },
  80                 { "dry-run", no_argument, NULL, 'n' },
  81                 { "type", required_argument, NULL, 't' },
  82                 { "action", required_argument, NULL, 'c' },
  83                 { "subsystem-match", required_argument, NULL, 's' },
  84                 { "subsystem-nomatch", required_argument, NULL, 'S' },
  85                 { "attr-match", required_argument, NULL, 'a' },
  86                 { "attr-nomatch", required_argument, NULL, 'A' },
  87                 { "property-match", required_argument, NULL, 'p' },
  88                 { "tag-match", required_argument, NULL, 'g' },
  89                 { "sysname-match", required_argument, NULL, 'y' },
  90                 { "parent-match", required_argument, NULL, 'b' },
  91                 { "help", no_argument, NULL, 'h' },
  92                 {}
  93         };
  94         enum {
  95                 TYPE_DEVICES,
  96                 TYPE_SUBSYSTEMS,
  97         } device_type = TYPE_DEVICES;
  98         const char *action = "change";
  99         struct udev_enumerate *udev_enumerate;
 100         int rc = 0;
 101
 102         udev_enumerate = udev_enumerate_new(udev);
 103         if (udev_enumerate == NULL) {
 104                 rc = 1;
 105                 goto exit;
 106         }
 107
 108         for (;;) {
 109                 int option;
 110                 const char *key;
 111                 const char *val;
 112                 char buf[UTIL_PATH_SIZE];
 113
 114                 option = getopt_long(argc, argv, "vng:o:t:hc:p:s:S:a:A:y:b:", options, NULL);
 115                 if (option == -1) {
 116                         if (optind < argc) {
 117                                 fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
 118                                 rc = 1;
 119                                 goto exit;
 120                         }
 121                         break;
 122                 }
 123
 124                 switch (option) {
 125                 case 'v':
 126                         verbose = 1;
 127                         break;
 128                 case 'n':
 129                         dry_run = 1;
 130                         break;
 131                 case 't':
 132                         if (streq(optarg, "devices")) {
 133                                 device_type = TYPE_DEVICES;
 134                         } else if (streq(optarg, "subsystems")) {
 135                                 device_type = TYPE_SUBSYSTEMS;
 136                         } else {
 137                                 log_error("unknown type --type=%s\n", optarg);
 138                                 rc = 2;
 139                                 goto exit;
 140                         }
 141                         break;
 142                 case 'c':
 143                         if (!nulstr_contains("add\0" "remove\0" "change\0", optarg)) {
 144                                 log_error("unknown action '%s'\n", optarg);
 145                                 rc = 2;
 146                                 goto exit;
 147                         } else {
 148                                 action = optarg;
 149                         }
 150                         break;
 151                 case 's':
 152                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 153                         break;
 154                 case 'S':
 155                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 156                         break;
 157                 case 'a':
 158                         key = keyval(optarg, &val, buf, sizeof(buf));
 159                         udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 160                         break;
 161                 case 'A':
 162                         key = keyval(optarg, &val, buf, sizeof(buf));
 163                         udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 164                         break;
 165                 case 'p':
 166                         key = keyval(optarg, &val, buf, sizeof(buf));
 167                         udev_enumerate_add_match_property(udev_enumerate, key, val);
 168                         break;
 169                 case 'g':
 170                         udev_enumerate_add_match_tag(udev_enumerate, optarg);
 171                         break;
 172                 case 'y':
 173                         udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 174                         break;
 175                 case 'b': {
 176                         char path[UTIL_PATH_SIZE];
 177                         struct udev_device *dev;
 178
 179                         /* add sys dir if needed */
 180                         if (!startswith(optarg, "/sys"))
 181                                 strscpyl(path, sizeof(path), "/sys", optarg, NULL);
 182                         else
 183                                 strscpy(path, sizeof(path), optarg);
 184                         util_remove_trailing_chars(path, '/');
 185                         dev = udev_device_new_from_syspath(udev, path);
 186                         if (dev == NULL) {
 187                                 log_error("unable to open the device '%s'\n", optarg);
 188                                 rc = 2;
 189                                 goto exit;
 190                         }
 191                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 192                         /* drop reference immediately, enumerate pins the device as long as needed */
 193                         udev_device_unref(dev);
 194                         break;
 195                 }
 196                 case 'h':
 197                         printf("Usage: udevadm trigger OPTIONS\n"
 198                                "  --verbose                       print the list of devices while running\n"
 199                                "  --dry-run                       do not actually trigger the events\n"
 200                                "  --type=                         type of events to trigger\n"
 201                                "      devices                       sys devices (default)\n"
 202                                "      subsystems                    sys subsystems and drivers\n"
 203                                "  --action=<action>               event action value, default is \"change\"\n"
 204                                "  --subsystem-match=<subsystem>   trigger devices from a matching subsystem\n"
 205                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subsystem\n"
 206                                "  --attr-match=<file[=<value>]>   trigger devices with a matching attribute\n"
 207                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
 208                                "  --property-match=<key>=<value>  trigger devices with a matching property\n"
 209                                "  --tag-match=<key>=<value>       trigger devices with a matching property\n"
 210                                "  --sysname-match=<name>          trigger devices with a matching name\n"
 211                                "  --parent-match=<name>           trigger devices with that parent device\n"
 212                                "  --help\n\n");
 213                         goto exit;
 214                 default:
 215                         rc = 1;
 216                         goto exit;
 217                 }
 218         }
 219
 220         switch (device_type) {
 221         case TYPE_SUBSYSTEMS:
 222                 udev_enumerate_scan_subsystems(udev_enumerate);
 223                 exec_list(udev_enumerate, action);
 224                 goto exit;
 225         case TYPE_DEVICES:
 226                 udev_enumerate_scan_devices(udev_enumerate);
 227                 exec_list(udev_enumerate, action);
 228                 goto exit;
 229         default:
 230                 assert_not_reached("device_type");
 231         }
 232 exit:
 233         udev_enumerate_unref(udev_enumerate);
 234         return rc;
 235 }
 236
 237 const struct udevadm_cmd udevadm_trigger = {
 238         .name = "trigger",
 239         .cmd = adm_trigger,
 240         .help = "request events from the kernel",
 241 };