udevtrigger.c

   1 /*
   2  * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
   3  * Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <getopt.h>
  26 #include <errno.h>
  27 #include <dirent.h>
  28 #include <fcntl.h>
  29 #include <syslog.h>
  30 #include <fnmatch.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <sys/un.h>
  35
  36 #include "udev.h"
  37 #include "udevd.h"
  38 #include "udev_rules.h"
  39
  40 static int verbose;
  41 static int dry_run;
  42 LIST_HEAD(device_list);
  43 LIST_HEAD(filter_subsystem_match_list);
  44 LIST_HEAD(filter_subsystem_nomatch_list);
  45 LIST_HEAD(filter_attr_match_list);
  46 LIST_HEAD(filter_attr_nomatch_list);
  47 static int sock = -1;
  48 static struct sockaddr_un saddr;
  49 static socklen_t saddrlen;
  50
  51 /* devices that should run last cause of their dependencies */
  52 static int delay_device(const char *devpath)
  53 {
  54         static const char *delay_device_list[] = {
  55                 "*/md*",
  56                 "*/dm-*",
  57                 NULL
  58         };
  59         int i;
  60
  61         for (i = 0; delay_device_list[i] != NULL; i++)
  62                 if (fnmatch(delay_device_list[i], devpath, 0) == 0)
  63                         return 1;
  64         return 0;
  65 }
  66
  67 static int device_list_insert(const char *path)
  68 {
  69         char filename[PATH_SIZE];
  70         char devpath[PATH_SIZE];
  71         struct stat statbuf;
  72
  73         dbg("add '%s'\n" , path);
  74
  75         /* we only have a device, if we have an uevent file */
  76         strlcpy(filename, path, sizeof(filename));
  77         strlcat(filename, "/uevent", sizeof(filename));
  78         if (stat(filename, &statbuf) < 0)
  79                 return -1;
  80         if (!(statbuf.st_mode & S_IWUSR))
  81                 return -1;
  82
  83         strlcpy(devpath, &path[strlen(sysfs_path)], sizeof(devpath));
  84
  85         /* resolve possible link to real target */
  86         if (lstat(path, &statbuf) < 0)
  87                 return -1;
  88         if (S_ISLNK(statbuf.st_mode))
  89                 if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
  90                         return -1;
  91
  92         name_list_add(&device_list, devpath, 1);
  93         return 0;
  94 }
  95
  96 static void trigger_uevent(const char *devpath, const char *action)
  97 {
  98         char filename[PATH_SIZE];
  99         int fd;
 100
 101         strlcpy(filename, sysfs_path, sizeof(filename));
 102         strlcat(filename, devpath, sizeof(filename));
 103         strlcat(filename, "/uevent", sizeof(filename));
 104
 105         if (verbose)
 106                 printf("%s\n", devpath);
 107
 108         if (dry_run)
 109                 return;
 110
 111         fd = open(filename, O_WRONLY);
 112         if (fd < 0) {
 113                 dbg("error on opening %s: %s\n", filename, strerror(errno));
 114                 return;
 115         }
 116
 117         if (write(fd, action, strlen(action)) < 0)
 118                 info("error writing '%s' to '%s': %s\n", action, filename, strerror(errno));
 119
 120         close(fd);
 121 }
 122
 123 static int pass_to_socket(const char *devpath, const char *action, const char *env)
 124 {
 125         struct udevice udev;
 126         struct name_entry *name_loop;
 127         char buf[4096];
 128         size_t bufpos = 0;
 129         ssize_t count;
 130         char path[PATH_SIZE];
 131         int fd;
 132         char link_target[PATH_SIZE];
 133         int len;
 134         int err = 0;
 135
 136         if (verbose)
 137                 printf("%s\n", devpath);
 138
 139         udev_device_init(&udev);
 140         udev_db_get_device(&udev, devpath);
 141
 142         /* add header */
 143         bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
 144         bufpos++;
 145
 146         /* add cookie */
 147         if (env != NULL) {
 148                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "%s", env);
 149                 bufpos++;
 150         }
 151
 152         /* add standard keys */
 153         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVPATH=%s", devpath);
 154         bufpos++;
 155         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "ACTION=%s", action);
 156         bufpos++;
 157
 158         /* add subsystem */
 159         strlcpy(path, sysfs_path, sizeof(path));
 160         strlcat(path, devpath, sizeof(path));
 161         strlcat(path, "/subsystem", sizeof(path));
 162         len = readlink(path, link_target, sizeof(link_target));
 163         if (len > 0) {
 164                 char *pos;
 165
 166                 link_target[len] = '\0';
 167                 pos = strrchr(link_target, '/');
 168                 if (pos != NULL) {
 169                         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "SUBSYSTEM=%s", &pos[1]);
 170                         bufpos++;
 171                 }
 172         }
 173
 174         /* add symlinks and node name */
 175         path[0] = '\0';
 176         list_for_each_entry(name_loop, &udev.symlink_list, node) {
 177                 strlcat(path, udev_root, sizeof(path));
 178                 strlcat(path, "/", sizeof(path));
 179                 strlcat(path, name_loop->name, sizeof(path));
 180                 strlcat(path, " ", sizeof(path));
 181         }
 182         remove_trailing_chars(path, ' ');
 183         if (path[0] != '\0') {
 184                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVLINKS=%s", path);
 185                 bufpos++;
 186         }
 187         if (udev.name[0] != '\0') {
 188                 strlcpy(path, udev_root, sizeof(path));
 189                 strlcat(path, "/", sizeof(path));
 190                 strlcat(path, udev.name, sizeof(path));
 191                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVNAME=%s", path);
 192                 bufpos++;
 193         }
 194
 195         /* add keys from device "uevent" file */
 196         strlcpy(path, sysfs_path, sizeof(path));
 197         strlcat(path, devpath, sizeof(path));
 198         strlcat(path, "/uevent", sizeof(path));
 199         fd = open(path, O_RDONLY);
 200         if (fd >= 0) {
 201                 char value[4096];
 202
 203                 count = read(fd, value, sizeof(value));
 204                 close(fd);
 205                 if (count > 0) {
 206                         char *key;
 207
 208                         value[count] = '\0';
 209                         key = value;
 210                         while (key[0] != '\0') {
 211                                 char *next;
 212
 213                                 next = strchr(key, '\n');
 214                                 if (next == NULL)
 215                                         break;
 216                                 next[0] = '\0';
 217                                 bufpos += strlcpy(&buf[bufpos], key, sizeof(buf) - bufpos-1);
 218                                 bufpos++;
 219                                 key = &next[1];
 220                         }
 221                 }
 222         }
 223
 224         /* add keys from database */
 225         list_for_each_entry(name_loop, &udev.env_list, node) {
 226                 bufpos += strlcpy(&buf[bufpos], name_loop->name, sizeof(buf) - bufpos-1);
 227                 bufpos++;
 228         }
 229         if (bufpos > sizeof(buf))
 230                 bufpos = sizeof(buf);
 231
 232         count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, saddrlen);
 233         if (count < 0)
 234                 err = -1;
 235
 236         return err;
 237 }
 238
 239 static void exec_list(const char *action, const char *env)
 240 {
 241         struct name_entry *loop_device;
 242         struct name_entry *tmp_device;
 243
 244         list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
 245                 if (delay_device(loop_device->name))
 246                         continue;
 247                 if (sock >= 0)
 248                         pass_to_socket(loop_device->name, action, env);
 249                 else
 250                         trigger_uevent(loop_device->name, action);
 251                 list_del(&loop_device->node);
 252                 free(loop_device);
 253         }
 254
 255         /* trigger remaining delayed devices */
 256         list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
 257                 if (sock >= 0)
 258                         pass_to_socket(loop_device->name, action, env);
 259                 else
 260                         trigger_uevent(loop_device->name, action);
 261                 list_del(&loop_device->node);
 262                 free(loop_device);
 263         }
 264 }
 265
 266 static int subsystem_filtered(const char *subsystem)
 267 {
 268         struct name_entry *loop_name;
 269
 270         /* skip devices matching the listed subsystems */
 271         list_for_each_entry(loop_name, &filter_subsystem_nomatch_list, node)
 272                 if (fnmatch(loop_name->name, subsystem, 0) == 0)
 273                         return 1;
 274
 275         /* skip devices not matching the listed subsystems */
 276         if (!list_empty(&filter_subsystem_match_list)) {
 277                 list_for_each_entry(loop_name, &filter_subsystem_match_list, node)
 278                         if (fnmatch(loop_name->name, subsystem, 0) == 0)
 279                                 return 0;
 280                 return 1;
 281         }
 282
 283         return 0;
 284 }
 285
 286 static int attr_match(const char *path, const char *attr_value)
 287 {
 288         char attr[NAME_SIZE];
 289         char file[PATH_SIZE];
 290         char *match_value;
 291
 292         strlcpy(attr, attr_value, sizeof(attr));
 293
 294         /* separate attr and match value */
 295         match_value = strchr(attr, '=');
 296         if (match_value != NULL) {
 297                 match_value[0] = '\0';
 298                 match_value = &match_value[1];
 299         }
 300
 301         strlcpy(file, path, sizeof(file));
 302         strlcat(file, "/", sizeof(file));
 303         strlcat(file, attr, sizeof(file));
 304
 305         if (match_value != NULL) {
 306                 /* match file content */
 307                 char value[NAME_SIZE];
 308                 int fd;
 309                 ssize_t size;
 310
 311                 fd = open(file, O_RDONLY);
 312                 if (fd < 0)
 313                         return 0;
 314                 size = read(fd, value, sizeof(value));
 315                 close(fd);
 316                 if (size < 0)
 317                         return 0;
 318                 value[size] = '\0';
 319                 remove_trailing_chars(value, '\n');
 320
 321                 /* match if attribute value matches */
 322                 if (fnmatch(match_value, value, 0) == 0)
 323                         return 1;
 324         } else {
 325                 /* match if attribute exists */
 326                 struct stat statbuf;
 327
 328                 if (stat(file, &statbuf) == 0)
 329                         return 1;
 330         }
 331         return 0;
 332 }
 333
 334 static int attr_filtered(const char *path)
 335 {
 336         struct name_entry *loop_name;
 337
 338         /* skip devices matching the listed sysfs attributes */
 339         list_for_each_entry(loop_name, &filter_attr_nomatch_list, node)
 340                 if (attr_match(path, loop_name->name))
 341                         return 1;
 342
 343         /* skip devices not matching the listed sysfs attributes */
 344         if (!list_empty(&filter_attr_match_list)) {
 345                 list_for_each_entry(loop_name, &filter_attr_match_list, node)
 346                         if (attr_match(path, loop_name->name))
 347                                 return 0;
 348                 return 1;
 349         }
 350         return 0;
 351 }
 352
 353 enum scan_type {
 354         SCAN_DEVICES,
 355         SCAN_SUBSYSTEM,
 356 };
 357
 358 static void scan_subsystem(const char *subsys, enum scan_type scan)
 359 {
 360         char base[PATH_SIZE];
 361         DIR *dir;
 362         struct dirent *dent;
 363         const char *subdir;
 364
 365         if (scan == SCAN_DEVICES)
 366                 subdir = "/devices";
 367         else if (scan == SCAN_SUBSYSTEM)
 368                 subdir = "/drivers";
 369         else
 370                 return;
 371
 372         strlcpy(base, sysfs_path, sizeof(base));
 373         strlcat(base, "/", sizeof(base));
 374         strlcat(base, subsys, sizeof(base));
 375
 376         dir = opendir(base);
 377         if (dir != NULL) {
 378                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 379                         char dirname[PATH_SIZE];
 380                         DIR *dir2;
 381                         struct dirent *dent2;
 382
 383                         if (dent->d_name[0] == '.')
 384                                 continue;
 385
 386                         if (scan == SCAN_DEVICES)
 387                                 if (subsystem_filtered(dent->d_name))
 388                                         continue;
 389
 390                         strlcpy(dirname, base, sizeof(dirname));
 391                         strlcat(dirname, "/", sizeof(dirname));
 392                         strlcat(dirname, dent->d_name, sizeof(dirname));
 393
 394                         if (scan == SCAN_SUBSYSTEM) {
 395                                 if (!subsystem_filtered("subsystem"))
 396                                         device_list_insert(dirname);
 397                                 if (subsystem_filtered("drivers"))
 398                                         continue;
 399                         }
 400
 401                         strlcat(dirname, subdir, sizeof(dirname));
 402
 403                         /* look for devices/drivers */
 404                         dir2 = opendir(dirname);
 405                         if (dir2 != NULL) {
 406                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 407                                         char dirname2[PATH_SIZE];
 408
 409                                         if (dent2->d_name[0] == '.')
 410                                                 continue;
 411
 412                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 413                                         strlcat(dirname2, "/", sizeof(dirname2));
 414                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 415                                         if (attr_filtered(dirname2))
 416                                                 continue;
 417                                         device_list_insert(dirname2);
 418                                 }
 419                                 closedir(dir2);
 420                         }
 421                 }
 422                 closedir(dir);
 423         }
 424 }
 425
 426 static void scan_block(void)
 427 {
 428         char base[PATH_SIZE];
 429         DIR *dir;
 430         struct dirent *dent;
 431
 432         if (subsystem_filtered("block"))
 433                 return;
 434
 435         strlcpy(base, sysfs_path, sizeof(base));
 436         strlcat(base, "/block", sizeof(base));
 437
 438         dir = opendir(base);
 439         if (dir != NULL) {
 440                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 441                         char dirname[PATH_SIZE];
 442                         DIR *dir2;
 443                         struct dirent *dent2;
 444
 445                         if (dent->d_name[0] == '.')
 446                                 continue;
 447
 448                         strlcpy(dirname, base, sizeof(dirname));
 449                         strlcat(dirname, "/", sizeof(dirname));
 450                         strlcat(dirname, dent->d_name, sizeof(dirname));
 451                         if (attr_filtered(dirname))
 452                                 continue;
 453                         if (device_list_insert(dirname) != 0)
 454                                 continue;
 455
 456                         /* look for partitions */
 457                         dir2 = opendir(dirname);
 458                         if (dir2 != NULL) {
 459                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 460                                         char dirname2[PATH_SIZE];
 461
 462                                         if (dent2->d_name[0] == '.')
 463                                                 continue;
 464
 465                                         if (!strcmp(dent2->d_name,"device"))
 466                                                 continue;
 467
 468                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 469                                         strlcat(dirname2, "/", sizeof(dirname2));
 470                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 471                                         if (attr_filtered(dirname2))
 472                                                 continue;
 473                                         device_list_insert(dirname2);
 474                                 }
 475                                 closedir(dir2);
 476                         }
 477                 }
 478                 closedir(dir);
 479         }
 480 }
 481
 482 static void scan_class(void)
 483 {
 484         char base[PATH_SIZE];
 485         DIR *dir;
 486         struct dirent *dent;
 487
 488         strlcpy(base, sysfs_path, sizeof(base));
 489         strlcat(base, "/class", sizeof(base));
 490
 491         dir = opendir(base);
 492         if (dir != NULL) {
 493                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 494                         char dirname[PATH_SIZE];
 495                         DIR *dir2;
 496                         struct dirent *dent2;
 497
 498                         if (dent->d_name[0] == '.')
 499                                 continue;
 500
 501                         if (subsystem_filtered(dent->d_name))
 502                                 continue;
 503
 504                         strlcpy(dirname, base, sizeof(dirname));
 505                         strlcat(dirname, "/", sizeof(dirname));
 506                         strlcat(dirname, dent->d_name, sizeof(dirname));
 507                         dir2 = opendir(dirname);
 508                         if (dir2 != NULL) {
 509                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 510                                         char dirname2[PATH_SIZE];
 511
 512                                         if (dent2->d_name[0] == '.')
 513                                                 continue;
 514
 515                                         if (!strcmp(dent2->d_name, "device"))
 516                                                 continue;
 517
 518                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 519                                         strlcat(dirname2, "/", sizeof(dirname2));
 520                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 521                                         if (attr_filtered(dirname2))
 522                                                 continue;
 523                                         device_list_insert(dirname2);
 524                                 }
 525                                 closedir(dir2);
 526                         }
 527                 }
 528                 closedir(dir);
 529         }
 530 }
 531
 532 static void scan_failed(void)
 533 {
 534         char base[PATH_SIZE];
 535         DIR *dir;
 536         struct dirent *dent;
 537
 538         strlcpy(base, udev_root, sizeof(base));
 539         strlcat(base, "/" EVENT_FAILED_DIR, sizeof(base));
 540
 541         dir = opendir(base);
 542         if (dir != NULL) {
 543                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 544                         char device[PATH_SIZE];
 545                         size_t start;
 546
 547                         if (dent->d_name[0] == '.')
 548                                 continue;
 549
 550                         start = strlcpy(device, sysfs_path, sizeof(device));
 551                         if(start >= sizeof(device))
 552                                 start = sizeof(device) - 1;
 553                         strlcat(device, dent->d_name, sizeof(device));
 554                         path_decode(&device[start]);
 555                         device_list_insert(device);
 556                 }
 557                 closedir(dir);
 558         }
 559 }
 560
 561 int udevtrigger(int argc, char *argv[], char *envp[])
 562 {
 563         int failed = 0;
 564         const char *sockpath = NULL;
 565         int option;
 566         const char *action = "add";
 567         const char *env = NULL;
 568         static const struct option options[] = {
 569                 { "verbose", 0, NULL, 'v' },
 570                 { "dry-run", 0, NULL, 'n' },
 571                 { "retry-failed", 0, NULL, 'F' },
 572                 { "socket", 1, NULL, 'o' },
 573                 { "help", 0, NULL, 'h' },
 574                 { "action", 1, NULL, 'c' },
 575                 { "subsystem-match", 1, NULL, 's' },
 576                 { "subsystem-nomatch", 1, NULL, 'S' },
 577                 { "attr-match", 1, NULL, 'a' },
 578                 { "attr-nomatch", 1, NULL, 'A' },
 579                 { "env", 1, NULL, 'e' },
 580                 {}
 581         };
 582
 583         logging_init("udevtrigger");
 584         udev_config_init();
 585         dbg("version %s\n", UDEV_VERSION);
 586         sysfs_init();
 587
 588         while (1) {
 589                 option = getopt_long(argc, argv, "vnFo:hce::s:S:a:A:", options, NULL);
 590                 if (option == -1)
 591                         break;
 592
 593                 switch (option) {
 594                 case 'v':
 595                         verbose = 1;
 596                         break;
 597                 case 'n':
 598                         dry_run = 1;
 599                         break;
 600                 case 'F':
 601                         failed = 1;
 602                         break;
 603                 case 'o':
 604                         sockpath = optarg;
 605                         break;
 606                 case 'c':
 607                         action = optarg;
 608                         break;
 609                 case 'e':
 610                         if (strchr(optarg, '=') != NULL)
 611                                 env = optarg;
 612                         break;
 613                 case 's':
 614                         name_list_add(&filter_subsystem_match_list, optarg, 0);
 615                         break;
 616                 case 'S':
 617                         name_list_add(&filter_subsystem_nomatch_list, optarg, 0);
 618                         break;
 619                 case 'a':
 620                         name_list_add(&filter_attr_match_list, optarg, 0);
 621                         break;
 622                 case 'A':
 623                         name_list_add(&filter_attr_nomatch_list, optarg, 0);
 624                         break;
 625                 case 'h':
 626                         printf("Usage: udevadm trigger OPTIONS\n"
 627                                "  --verbose                       print the list of devices while running\n"
 628                                "  --dry-run                       do not actually trigger the events\n"
 629                                "  --retry-failed                  trigger only the events which have been\n"
 630                                "                                  marked as failed during a previous run\n"
 631                                "  --socket=<socket path>          pass events to socket instead of triggering kernel events\n"
 632                                "  --env=<KEY>=<value>             pass an additional key (works only with --socket=)\n"
 633                                "  --subsystem-match=<subsystem>   trigger devices from a matching subystem\n"
 634                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subystem\n"
 635                                "  --attr-match=<file[=<value>]>   trigger devices with a matching sysfs\n"
 636                                "                                  attribute\n"
 637                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching sysfs\n"
 638                                "                                  attribute\n"
 639                                "  --help                          print this text\n"
 640                                "\n");
 641                         goto exit;
 642                 default:
 643                         goto exit;
 644                 }
 645         }
 646
 647         if (sockpath != NULL) {
 648                 struct stat stats;
 649
 650                 sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 651                 memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 652                 saddr.sun_family = AF_LOCAL;
 653                 if (sockpath[0] == '@') {
 654                         /* abstract namespace socket requested */
 655                         strlcpy(&saddr.sun_path[1], &sockpath[1], sizeof(saddr.sun_path)-1);
 656                         saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 657                 } else if (stat(sockpath, &stats) == 0 && S_ISSOCK(stats.st_mode)) {
 658                         /* existing socket file */
 659                         strlcpy(saddr.sun_path, sockpath, sizeof(saddr.sun_path));
 660                         saddrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
 661                 } else {
 662                         /* no socket file, assume abstract namespace socket */
 663                         strlcpy(&saddr.sun_path[1], sockpath, sizeof(saddr.sun_path)-1);
 664                         saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 665                 }
 666         } else if (env != NULL) {
 667                 fprintf(stderr, "error: --env= only valid with --socket= option\n");
 668                 goto exit;
 669         }
 670
 671         if (failed) {
 672                 scan_failed();
 673                 exec_list(action, env);
 674         } else {
 675                 char base[PATH_SIZE];
 676                 struct stat statbuf;
 677
 678                 /* if we have /sys/subsystem, forget all the old stuff */
 679                 strlcpy(base, sysfs_path, sizeof(base));
 680                 strlcat(base, "/subsystem", sizeof(base));
 681                 if (stat(base, &statbuf) == 0) {
 682                         scan_subsystem("subsystem", SCAN_SUBSYSTEM);
 683                         exec_list(action, env);
 684                         scan_subsystem("subsystem", SCAN_DEVICES);
 685                         exec_list(action, env);
 686                 } else {
 687                         scan_subsystem("bus", SCAN_SUBSYSTEM);
 688                         exec_list(action, env);
 689                         scan_subsystem("bus", SCAN_DEVICES);
 690                         scan_class();
 691
 692                         /* scan "block" if it isn't a "class" */
 693                         strlcpy(base, sysfs_path, sizeof(base));
 694                         strlcat(base, "/class/block", sizeof(base));
 695                         if (stat(base, &statbuf) != 0)
 696                                 scan_block();
 697                         exec_list(action, env);
 698                 }
 699         }
 700
 701 exit:
 702         name_list_cleanup(&filter_subsystem_match_list);
 703         name_list_cleanup(&filter_subsystem_nomatch_list);
 704         name_list_cleanup(&filter_attr_match_list);
 705         name_list_cleanup(&filter_attr_nomatch_list);
 706
 707         if (sock >= 0)
 708                 close(sock);
 709         sysfs_cleanup();
 710         logging_close();
 711         return 0;
 712 }