udev/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 = udev_device_init();
 140         if (udev == NULL)
 141                 return -1;
 142         udev_db_get_device(udev, devpath);
 143
 144         /* add header */
 145         bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
 146         bufpos++;
 147
 148         /* add cookie */
 149         if (env != NULL) {
 150                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "%s", env);
 151                 bufpos++;
 152         }
 153
 154         /* add standard keys */
 155         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVPATH=%s", devpath);
 156         bufpos++;
 157         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "ACTION=%s", action);
 158         bufpos++;
 159
 160         /* add subsystem */
 161         strlcpy(path, sysfs_path, sizeof(path));
 162         strlcat(path, devpath, sizeof(path));
 163         strlcat(path, "/subsystem", sizeof(path));
 164         len = readlink(path, link_target, sizeof(link_target));
 165         if (len > 0) {
 166                 char *pos;
 167
 168                 link_target[len] = '\0';
 169                 pos = strrchr(link_target, '/');
 170                 if (pos != NULL) {
 171                         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "SUBSYSTEM=%s", &pos[1]);
 172                         bufpos++;
 173                 }
 174         }
 175
 176         /* add symlinks and node name */
 177         path[0] = '\0';
 178         list_for_each_entry(name_loop, &udev->symlink_list, node) {
 179                 strlcat(path, udev_root, sizeof(path));
 180                 strlcat(path, "/", sizeof(path));
 181                 strlcat(path, name_loop->name, sizeof(path));
 182                 strlcat(path, " ", sizeof(path));
 183         }
 184         remove_trailing_chars(path, ' ');
 185         if (path[0] != '\0') {
 186                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVLINKS=%s", path);
 187                 bufpos++;
 188         }
 189         if (udev->name[0] != '\0') {
 190                 strlcpy(path, udev_root, sizeof(path));
 191                 strlcat(path, "/", sizeof(path));
 192                 strlcat(path, udev->name, sizeof(path));
 193                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVNAME=%s", path);
 194                 bufpos++;
 195         }
 196
 197         /* add keys from device "uevent" file */
 198         strlcpy(path, sysfs_path, sizeof(path));
 199         strlcat(path, devpath, sizeof(path));
 200         strlcat(path, "/uevent", sizeof(path));
 201         fd = open(path, O_RDONLY);
 202         if (fd >= 0) {
 203                 char value[4096];
 204
 205                 count = read(fd, value, sizeof(value));
 206                 close(fd);
 207                 if (count > 0) {
 208                         char *key;
 209
 210                         value[count] = '\0';
 211                         key = value;
 212                         while (key[0] != '\0') {
 213                                 char *next;
 214
 215                                 next = strchr(key, '\n');
 216                                 if (next == NULL)
 217                                         break;
 218                                 next[0] = '\0';
 219                                 bufpos += strlcpy(&buf[bufpos], key, sizeof(buf) - bufpos-1);
 220                                 bufpos++;
 221                                 key = &next[1];
 222                         }
 223                 }
 224         }
 225
 226         /* add keys from database */
 227         list_for_each_entry(name_loop, &udev->env_list, node) {
 228                 bufpos += strlcpy(&buf[bufpos], name_loop->name, sizeof(buf) - bufpos-1);
 229                 bufpos++;
 230         }
 231         if (bufpos > sizeof(buf))
 232                 bufpos = sizeof(buf);
 233
 234         count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, saddrlen);
 235         if (count < 0)
 236                 err = -1;
 237
 238         return err;
 239 }
 240
 241 static void exec_list(const char *action, const char *env)
 242 {
 243         struct name_entry *loop_device;
 244         struct name_entry *tmp_device;
 245
 246         list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
 247                 if (delay_device(loop_device->name))
 248                         continue;
 249                 if (sock >= 0)
 250                         pass_to_socket(loop_device->name, action, env);
 251                 else
 252                         trigger_uevent(loop_device->name, action);
 253                 list_del(&loop_device->node);
 254                 free(loop_device);
 255         }
 256
 257         /* trigger remaining delayed devices */
 258         list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
 259                 if (sock >= 0)
 260                         pass_to_socket(loop_device->name, action, env);
 261                 else
 262                         trigger_uevent(loop_device->name, action);
 263                 list_del(&loop_device->node);
 264                 free(loop_device);
 265         }
 266 }
 267
 268 static int subsystem_filtered(const char *subsystem)
 269 {
 270         struct name_entry *loop_name;
 271
 272         /* skip devices matching the listed subsystems */
 273         list_for_each_entry(loop_name, &filter_subsystem_nomatch_list, node)
 274                 if (fnmatch(loop_name->name, subsystem, 0) == 0)
 275                         return 1;
 276
 277         /* skip devices not matching the listed subsystems */
 278         if (!list_empty(&filter_subsystem_match_list)) {
 279                 list_for_each_entry(loop_name, &filter_subsystem_match_list, node)
 280                         if (fnmatch(loop_name->name, subsystem, 0) == 0)
 281                                 return 0;
 282                 return 1;
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int attr_match(const char *path, const char *attr_value)
 289 {
 290         char attr[NAME_SIZE];
 291         char file[PATH_SIZE];
 292         char *match_value;
 293
 294         strlcpy(attr, attr_value, sizeof(attr));
 295
 296         /* separate attr and match value */
 297         match_value = strchr(attr, '=');
 298         if (match_value != NULL) {
 299                 match_value[0] = '\0';
 300                 match_value = &match_value[1];
 301         }
 302
 303         strlcpy(file, path, sizeof(file));
 304         strlcat(file, "/", sizeof(file));
 305         strlcat(file, attr, sizeof(file));
 306
 307         if (match_value != NULL) {
 308                 /* match file content */
 309                 char value[NAME_SIZE];
 310                 int fd;
 311                 ssize_t size;
 312
 313                 fd = open(file, O_RDONLY);
 314                 if (fd < 0)
 315                         return 0;
 316                 size = read(fd, value, sizeof(value));
 317                 close(fd);
 318                 if (size < 0)
 319                         return 0;
 320                 value[size] = '\0';
 321                 remove_trailing_chars(value, '\n');
 322
 323                 /* match if attribute value matches */
 324                 if (fnmatch(match_value, value, 0) == 0)
 325                         return 1;
 326         } else {
 327                 /* match if attribute exists */
 328                 struct stat statbuf;
 329
 330                 if (stat(file, &statbuf) == 0)
 331                         return 1;
 332         }
 333         return 0;
 334 }
 335
 336 static int attr_filtered(const char *path)
 337 {
 338         struct name_entry *loop_name;
 339
 340         /* skip devices matching the listed sysfs attributes */
 341         list_for_each_entry(loop_name, &filter_attr_nomatch_list, node)
 342                 if (attr_match(path, loop_name->name))
 343                         return 1;
 344
 345         /* skip devices not matching the listed sysfs attributes */
 346         if (!list_empty(&filter_attr_match_list)) {
 347                 list_for_each_entry(loop_name, &filter_attr_match_list, node)
 348                         if (attr_match(path, loop_name->name))
 349                                 return 0;
 350                 return 1;
 351         }
 352         return 0;
 353 }
 354
 355 enum scan_type {
 356         SCAN_DEVICES,
 357         SCAN_SUBSYSTEM,
 358 };
 359
 360 static void scan_subsystem(const char *subsys, enum scan_type scan)
 361 {
 362         char base[PATH_SIZE];
 363         DIR *dir;
 364         struct dirent *dent;
 365         const char *subdir;
 366
 367         if (scan == SCAN_DEVICES)
 368                 subdir = "/devices";
 369         else if (scan == SCAN_SUBSYSTEM)
 370                 subdir = "/drivers";
 371         else
 372                 return;
 373
 374         strlcpy(base, sysfs_path, sizeof(base));
 375         strlcat(base, "/", sizeof(base));
 376         strlcat(base, subsys, sizeof(base));
 377
 378         dir = opendir(base);
 379         if (dir != NULL) {
 380                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 381                         char dirname[PATH_SIZE];
 382                         DIR *dir2;
 383                         struct dirent *dent2;
 384
 385                         if (dent->d_name[0] == '.')
 386                                 continue;
 387
 388                         if (scan == SCAN_DEVICES)
 389                                 if (subsystem_filtered(dent->d_name))
 390                                         continue;
 391
 392                         strlcpy(dirname, base, sizeof(dirname));
 393                         strlcat(dirname, "/", sizeof(dirname));
 394                         strlcat(dirname, dent->d_name, sizeof(dirname));
 395
 396                         if (scan == SCAN_SUBSYSTEM) {
 397                                 if (attr_filtered(dirname))
 398                                         continue;
 399                                 if (!subsystem_filtered("subsystem"))
 400                                         device_list_insert(dirname);
 401                                 if (subsystem_filtered("drivers"))
 402                                         continue;
 403                         }
 404
 405                         strlcat(dirname, subdir, sizeof(dirname));
 406
 407                         /* look for devices/drivers */
 408                         dir2 = opendir(dirname);
 409                         if (dir2 != NULL) {
 410                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 411                                         char dirname2[PATH_SIZE];
 412
 413                                         if (dent2->d_name[0] == '.')
 414                                                 continue;
 415
 416                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 417                                         strlcat(dirname2, "/", sizeof(dirname2));
 418                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 419                                         if (attr_filtered(dirname2))
 420                                                 continue;
 421                                         device_list_insert(dirname2);
 422                                 }
 423                                 closedir(dir2);
 424                         }
 425                 }
 426                 closedir(dir);
 427         }
 428 }
 429
 430 static void scan_block(void)
 431 {
 432         char base[PATH_SIZE];
 433         DIR *dir;
 434         struct dirent *dent;
 435
 436         if (subsystem_filtered("block"))
 437                 return;
 438
 439         strlcpy(base, sysfs_path, sizeof(base));
 440         strlcat(base, "/block", sizeof(base));
 441
 442         dir = opendir(base);
 443         if (dir != NULL) {
 444                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 445                         char dirname[PATH_SIZE];
 446                         DIR *dir2;
 447                         struct dirent *dent2;
 448
 449                         if (dent->d_name[0] == '.')
 450                                 continue;
 451
 452                         strlcpy(dirname, base, sizeof(dirname));
 453                         strlcat(dirname, "/", sizeof(dirname));
 454                         strlcat(dirname, dent->d_name, sizeof(dirname));
 455                         if (attr_filtered(dirname))
 456                                 continue;
 457                         if (device_list_insert(dirname) != 0)
 458                                 continue;
 459
 460                         /* look for partitions */
 461                         dir2 = opendir(dirname);
 462                         if (dir2 != NULL) {
 463                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 464                                         char dirname2[PATH_SIZE];
 465
 466                                         if (dent2->d_name[0] == '.')
 467                                                 continue;
 468
 469                                         if (!strcmp(dent2->d_name,"device"))
 470                                                 continue;
 471
 472                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 473                                         strlcat(dirname2, "/", sizeof(dirname2));
 474                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 475                                         if (attr_filtered(dirname2))
 476                                                 continue;
 477                                         device_list_insert(dirname2);
 478                                 }
 479                                 closedir(dir2);
 480                         }
 481                 }
 482                 closedir(dir);
 483         }
 484 }
 485
 486 static void scan_class(void)
 487 {
 488         char base[PATH_SIZE];
 489         DIR *dir;
 490         struct dirent *dent;
 491
 492         strlcpy(base, sysfs_path, sizeof(base));
 493         strlcat(base, "/class", sizeof(base));
 494
 495         dir = opendir(base);
 496         if (dir != NULL) {
 497                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 498                         char dirname[PATH_SIZE];
 499                         DIR *dir2;
 500                         struct dirent *dent2;
 501
 502                         if (dent->d_name[0] == '.')
 503                                 continue;
 504
 505                         if (subsystem_filtered(dent->d_name))
 506                                 continue;
 507
 508                         strlcpy(dirname, base, sizeof(dirname));
 509                         strlcat(dirname, "/", sizeof(dirname));
 510                         strlcat(dirname, dent->d_name, sizeof(dirname));
 511                         dir2 = opendir(dirname);
 512                         if (dir2 != NULL) {
 513                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 514                                         char dirname2[PATH_SIZE];
 515
 516                                         if (dent2->d_name[0] == '.')
 517                                                 continue;
 518
 519                                         if (!strcmp(dent2->d_name, "device"))
 520                                                 continue;
 521
 522                                         strlcpy(dirname2, dirname, sizeof(dirname2));
 523                                         strlcat(dirname2, "/", sizeof(dirname2));
 524                                         strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 525                                         if (attr_filtered(dirname2))
 526                                                 continue;
 527                                         device_list_insert(dirname2);
 528                                 }
 529                                 closedir(dir2);
 530                         }
 531                 }
 532                 closedir(dir);
 533         }
 534 }
 535
 536 static void scan_failed(void)
 537 {
 538         char base[PATH_SIZE];
 539         DIR *dir;
 540         struct dirent *dent;
 541
 542         strlcpy(base, udev_root, sizeof(base));
 543         strlcat(base, "/.udev/failed", sizeof(base));
 544
 545         dir = opendir(base);
 546         if (dir != NULL) {
 547                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 548                         char device[PATH_SIZE];
 549                         size_t start;
 550
 551                         if (dent->d_name[0] == '.')
 552                                 continue;
 553
 554                         start = strlcpy(device, sysfs_path, sizeof(device));
 555                         if(start >= sizeof(device))
 556                                 start = sizeof(device) - 1;
 557                         strlcat(device, dent->d_name, sizeof(device));
 558                         path_decode(&device[start]);
 559                         device_list_insert(device);
 560                 }
 561                 closedir(dir);
 562         }
 563 }
 564
 565 int udevtrigger(int argc, char *argv[])
 566 {
 567         int failed = 0;
 568         const char *sockpath = NULL;
 569         int option;
 570         const char *action = "add";
 571         const char *env = NULL;
 572         static const struct option options[] = {
 573                 { "verbose", 0, NULL, 'v' },
 574                 { "dry-run", 0, NULL, 'n' },
 575                 { "retry-failed", 0, NULL, 'F' },
 576                 { "socket", 1, NULL, 'o' },
 577                 { "help", 0, NULL, 'h' },
 578                 { "action", 1, NULL, 'c' },
 579                 { "subsystem-match", 1, NULL, 's' },
 580                 { "subsystem-nomatch", 1, NULL, 'S' },
 581                 { "attr-match", 1, NULL, 'a' },
 582                 { "attr-nomatch", 1, NULL, 'A' },
 583                 { "env", 1, NULL, 'e' },
 584                 {}
 585         };
 586
 587         logging_init("udevtrigger");
 588         udev_config_init();
 589         dbg("version %s\n", VERSION);
 590         sysfs_init();
 591
 592         while (1) {
 593                 option = getopt_long(argc, argv, "vnFo:hce::s:S:a:A:", options, NULL);
 594                 if (option == -1)
 595                         break;
 596
 597                 switch (option) {
 598                 case 'v':
 599                         verbose = 1;
 600                         break;
 601                 case 'n':
 602                         dry_run = 1;
 603                         break;
 604                 case 'F':
 605                         failed = 1;
 606                         break;
 607                 case 'o':
 608                         sockpath = optarg;
 609                         break;
 610                 case 'c':
 611                         action = optarg;
 612                         break;
 613                 case 'e':
 614                         if (strchr(optarg, '=') != NULL)
 615                                 env = optarg;
 616                         break;
 617                 case 's':
 618                         name_list_add(&filter_subsystem_match_list, optarg, 0);
 619                         break;
 620                 case 'S':
 621                         name_list_add(&filter_subsystem_nomatch_list, optarg, 0);
 622                         break;
 623                 case 'a':
 624                         name_list_add(&filter_attr_match_list, optarg, 0);
 625                         break;
 626                 case 'A':
 627                         name_list_add(&filter_attr_nomatch_list, optarg, 0);
 628                         break;
 629                 case 'h':
 630                         printf("Usage: udevadm trigger OPTIONS\n"
 631                                "  --verbose                       print the list of devices while running\n"
 632                                "  --dry-run                       do not actually trigger the events\n"
 633                                "  --retry-failed                  trigger only the events which have been\n"
 634                                "                                  marked as failed during a previous run\n"
 635                                "  --socket=<socket path>          pass events to socket instead of triggering kernel events\n"
 636                                "  --env=<KEY>=<value>             pass an additional key (works only with --socket=)\n"
 637                                "  --subsystem-match=<subsystem>   trigger devices from a matching subystem\n"
 638                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subystem\n"
 639                                "  --attr-match=<file[=<value>]>   trigger devices with a matching sysfs\n"
 640                                "                                  attribute\n"
 641                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching sysfs\n"
 642                                "                                  attribute\n"
 643                                "  --help                          print this text\n"
 644                                "\n");
 645                         goto exit;
 646                 default:
 647                         goto exit;
 648                 }
 649         }
 650
 651         if (sockpath != NULL) {
 652                 struct stat stats;
 653
 654                 sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 655                 memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 656                 saddr.sun_family = AF_LOCAL;
 657                 if (sockpath[0] == '@') {
 658                         /* abstract namespace socket requested */
 659                         strlcpy(&saddr.sun_path[1], &sockpath[1], sizeof(saddr.sun_path)-1);
 660                         saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 661                 } else if (stat(sockpath, &stats) == 0 && S_ISSOCK(stats.st_mode)) {
 662                         /* existing socket file */
 663                         strlcpy(saddr.sun_path, sockpath, sizeof(saddr.sun_path));
 664                         saddrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
 665                 } else {
 666                         /* no socket file, assume abstract namespace socket */
 667                         strlcpy(&saddr.sun_path[1], sockpath, sizeof(saddr.sun_path)-1);
 668                         saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 669                 }
 670         } else if (env != NULL) {
 671                 fprintf(stderr, "error: --env= only valid with --socket= option\n");
 672                 goto exit;
 673         }
 674
 675         if (failed) {
 676                 scan_failed();
 677                 exec_list(action, env);
 678         } else {
 679                 char base[PATH_SIZE];
 680                 struct stat statbuf;
 681
 682                 /* if we have /sys/subsystem, forget all the old stuff */
 683                 strlcpy(base, sysfs_path, sizeof(base));
 684                 strlcat(base, "/subsystem", sizeof(base));
 685                 if (stat(base, &statbuf) == 0) {
 686                         scan_subsystem("subsystem", SCAN_SUBSYSTEM);
 687                         exec_list(action, env);
 688                         scan_subsystem("subsystem", SCAN_DEVICES);
 689                         exec_list(action, env);
 690                 } else {
 691                         scan_subsystem("bus", SCAN_SUBSYSTEM);
 692                         exec_list(action, env);
 693                         scan_subsystem("bus", SCAN_DEVICES);
 694                         scan_class();
 695
 696                         /* scan "block" if it isn't a "class" */
 697                         strlcpy(base, sysfs_path, sizeof(base));
 698                         strlcat(base, "/class/block", sizeof(base));
 699                         if (stat(base, &statbuf) != 0)
 700                                 scan_block();
 701                         exec_list(action, env);
 702                 }
 703         }
 704
 705 exit:
 706         name_list_cleanup(&filter_subsystem_match_list);
 707         name_list_cleanup(&filter_subsystem_nomatch_list);
 708         name_list_cleanup(&filter_attr_match_list);
 709         name_list_cleanup(&filter_attr_nomatch_list);
 710
 711         if (sock >= 0)
 712                 close(sock);
 713         sysfs_cleanup();
 714         logging_close();
 715         return 0;
 716 }