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 <fnmatch.h>
  28 #include <sys/stat.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <sys/un.h>
  32
  33 #include "udev.h"
  34 #include "udev-util.h"
  35 #include "udevadm-util.h"
  36 #include "util.h"
  37
  38 static int verbose;
  39 static int dry_run;
  40
  41 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action) {
  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|O_CLOEXEC);
  54                 if (fd < 0)
  55                         continue;
  56                 if (write(fd, action, strlen(action)) < 0)
  57                         log_debug_errno(errno, "error writing '%s' to '%s': %m", 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         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 void help(void) {
  76         printf("%s trigger OPTIONS\n\n"
  77                "Request events from the kernel.\n\n"
  78                "  -h --help                         Show this help\n"
  79                "     --version                      Show package version\n"
  80                "  -v --verbose                      Print the list of devices while running\n"
  81                "  -n --dry-run                      Do not actually trigger the events\n"
  82                "  -t --type=                        Type of events to trigger\n"
  83                "          devices                     sysfs devices (default)\n"
  84                "          subsystems                  sysfs subsystems and drivers\n"
  85                "  -c --action=ACTION                Event action value, default is \"change\"\n"
  86                "  -s --subsystem-match=SUBSYSTEM    Trigger devices from a matching subsystem\n"
  87                "  -S --subsystem-nomatch=SUBSYSTEM  Exclude devices from a matching subsystem\n"
  88                "  -a --attr-match=FILE[=VALUE]      Trigger devices with a matching attribute\n"
  89                "  -A --attr-nomatch=FILE[=VALUE]    Exclude devices with a matching attribute\n"
  90                "  -p --property-match=KEY=VALUE     Trigger devices with a matching property\n"
  91                "  -g --tag-match=KEY=VALUE          Trigger devices with a matching property\n"
  92                "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
  93                "     --name-match=NAME              Trigger devices with this /dev name\n"
  94                "  -b --parent-match=NAME            Trigger devices with that parent device\n"
  95                , program_invocation_short_name);
  96 }
  97
  98 static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
  99         enum {
 100                 ARG_NAME = 0x100,
 101         };
 102
 103         static const struct option options[] = {
 104                 { "verbose",           no_argument,       NULL, 'v'      },
 105                 { "dry-run",           no_argument,       NULL, 'n'      },
 106                 { "type",              required_argument, NULL, 't'      },
 107                 { "action",            required_argument, NULL, 'c'      },
 108                 { "subsystem-match",   required_argument, NULL, 's'      },
 109                 { "subsystem-nomatch", required_argument, NULL, 'S'      },
 110                 { "attr-match",        required_argument, NULL, 'a'      },
 111                 { "attr-nomatch",      required_argument, NULL, 'A'      },
 112                 { "property-match",    required_argument, NULL, 'p'      },
 113                 { "tag-match",         required_argument, NULL, 'g'      },
 114                 { "sysname-match",     required_argument, NULL, 'y'      },
 115                 { "name-match",        required_argument, NULL, ARG_NAME },
 116                 { "parent-match",      required_argument, NULL, 'b'      },
 117                 { "help",              no_argument,       NULL, 'h'      },
 118                 {}
 119         };
 120         enum {
 121                 TYPE_DEVICES,
 122                 TYPE_SUBSYSTEMS,
 123         } device_type = TYPE_DEVICES;
 124         const char *action = "change";
 125         _cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
 126         int c;
 127
 128         udev_enumerate = udev_enumerate_new(udev);
 129         if (udev_enumerate == NULL)
 130                 return 1;
 131
 132         while ((c = getopt_long(argc, argv, "vno:t:c:s:S:a:A:p:g:y:b:h", options, NULL)) >= 0) {
 133                 const char *key;
 134                 const char *val;
 135                 char buf[UTIL_PATH_SIZE];
 136
 137                 switch (c) {
 138                 case 'v':
 139                         verbose = 1;
 140                         break;
 141                 case 'n':
 142                         dry_run = 1;
 143                         break;
 144                 case 't':
 145                         if (streq(optarg, "devices"))
 146                                 device_type = TYPE_DEVICES;
 147                         else if (streq(optarg, "subsystems"))
 148                                 device_type = TYPE_SUBSYSTEMS;
 149                         else {
 150                                 log_error("unknown type --type=%s", optarg);
 151                                 return 2;
 152                         }
 153                         break;
 154                 case 'c':
 155                         if (!nulstr_contains("add\0" "remove\0" "change\0", optarg)) {
 156                                 log_error("unknown action '%s'", optarg);
 157                                 return 2;
 158                         } else
 159                                 action = optarg;
 160
 161                         break;
 162                 case 's':
 163                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 164                         break;
 165                 case 'S':
 166                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 167                         break;
 168                 case 'a':
 169                         key = keyval(optarg, &val, buf, sizeof(buf));
 170                         udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 171                         break;
 172                 case 'A':
 173                         key = keyval(optarg, &val, buf, sizeof(buf));
 174                         udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 175                         break;
 176                 case 'p':
 177                         key = keyval(optarg, &val, buf, sizeof(buf));
 178                         udev_enumerate_add_match_property(udev_enumerate, key, val);
 179                         break;
 180                 case 'g':
 181                         udev_enumerate_add_match_tag(udev_enumerate, optarg);
 182                         break;
 183                 case 'y':
 184                         udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 185                         break;
 186                 case 'b': {
 187                         _cleanup_udev_device_unref_ struct udev_device *dev;
 188
 189                         dev = find_device(udev, optarg, "/sys");
 190                         if (dev == NULL) {
 191                                 log_error("unable to open the device '%s'", optarg);
 192                                 return 2;
 193                         }
 194
 195                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 196                         break;
 197                 }
 198
 199                 case ARG_NAME: {
 200                         _cleanup_udev_device_unref_ struct udev_device *dev;
 201
 202                         dev = find_device(udev, optarg, "/dev/");
 203                         if (dev == NULL) {
 204                                 log_error("unable to open the device '%s'", optarg);
 205                                 return 2;
 206                         }
 207
 208                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 209                         break;
 210                 }
 211
 212                 case 'h':
 213                         help();
 214                         return 0;
 215                 case '?':
 216                         return 1;
 217                 default:
 218                         assert_not_reached("Unknown option");
 219                 }
 220         }
 221
 222         for (; optind < argc; optind++) {
 223                 _cleanup_udev_device_unref_ struct udev_device *dev;
 224
 225                 dev = find_device(udev, argv[optind], NULL);
 226                 if (dev == NULL) {
 227                         log_error("unable to open the device '%s'", argv[optind]);
 228                         return 2;
 229                 }
 230
 231                 udev_enumerate_add_match_parent(udev_enumerate, dev);
 232         }
 233
 234         switch (device_type) {
 235         case TYPE_SUBSYSTEMS:
 236                 udev_enumerate_scan_subsystems(udev_enumerate);
 237                 exec_list(udev_enumerate, action);
 238                 return 0;
 239         case TYPE_DEVICES:
 240                 udev_enumerate_scan_devices(udev_enumerate);
 241                 exec_list(udev_enumerate, action);
 242                 return 0;
 243         default:
 244                 assert_not_reached("device_type");
 245         }
 246 }
 247
 248 const struct udevadm_cmd udevadm_trigger = {
 249         .name = "trigger",
 250         .cmd = adm_trigger,
 251         .help = "Request events from the kernel",
 252 };