udev/udevadm-trigger.c

   1 /*
   2  * Copyright (C) 2004-2008 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
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdlib.h>
  20 #include <stddef.h>
  21 #include <string.h>
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <getopt.h>
  25 #include <errno.h>
  26 #include <dirent.h>
  27 #include <fcntl.h>
  28 #include <syslog.h>
  29 #include <fnmatch.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <sys/un.h>
  34
  35 #include "udev.h"
  36 #include "udev_rules.h"
  37
  38 static int verbose;
  39 static int dry_run;
  40 LIST_HEAD(device_list);
  41 LIST_HEAD(filter_subsystem_match_list);
  42 LIST_HEAD(filter_subsystem_nomatch_list);
  43 LIST_HEAD(filter_attr_match_list);
  44 LIST_HEAD(filter_attr_nomatch_list);
  45 static int sock = -1;
  46 static struct sockaddr_un saddr;
  47 static socklen_t saddrlen;
  48
  49 /* devices that should run last cause of their dependencies */
  50 static int delay_device(const char *syspath)
  51 {
  52         static const char *delay_device_list[] = {
  53                 "*/md*",
  54                 "*/dm-*",
  55                 NULL
  56         };
  57         int i;
  58
  59         for (i = 0; delay_device_list[i] != NULL; i++)
  60                 if (fnmatch(delay_device_list[i], syspath, 0) == 0)
  61                         return 1;
  62         return 0;
  63 }
  64
  65 static int device_list_insert(struct udev *udev, const char *path)
  66 {
  67         char filename[UTIL_PATH_SIZE];
  68         struct stat statbuf;
  69
  70         dbg(udev, "add '%s'\n" , path);
  71
  72         /* we only have a device, if we have an uevent file */
  73         util_strlcpy(filename, path, sizeof(filename));
  74         util_strlcat(filename, "/uevent", sizeof(filename));
  75         if (stat(filename, &statbuf) < 0)
  76                 return -1;
  77         if (!(statbuf.st_mode & S_IWUSR))
  78                 return -1;
  79
  80         /* resolve possible link to real target */
  81         util_strlcpy(filename, path, sizeof(filename));
  82         if (lstat(filename, &statbuf) < 0)
  83                 return -1;
  84         if (S_ISLNK(statbuf.st_mode))
  85                 if (util_resolve_sys_link(udev, filename, sizeof(filename)) != 0)
  86                         return -1;
  87
  88         name_list_add(udev, &device_list, filename, 1);
  89         return 0;
  90 }
  91
  92 static void trigger_uevent(struct udev *udev, const char *syspath, const char *action)
  93 {
  94         char filename[UTIL_PATH_SIZE];
  95         int fd;
  96
  97         util_strlcpy(filename, syspath, sizeof(filename));
  98         util_strlcat(filename, "/uevent", sizeof(filename));
  99
 100         if (verbose)
 101                 printf("%s\n", syspath);
 102
 103         if (dry_run)
 104                 return;
 105
 106         fd = open(filename, O_WRONLY);
 107         if (fd < 0) {
 108                 dbg(udev, "error on opening %s: %s\n", filename, strerror(errno));
 109                 return;
 110         }
 111
 112         if (write(fd, action, strlen(action)) < 0)
 113                 info(udev, "error writing '%s' to '%s': %s\n", action, filename, strerror(errno));
 114
 115         close(fd);
 116 }
 117
 118 static int pass_to_socket(struct udev *udev, const char *syspath, const char *action, const char *env)
 119 {
 120         struct udevice *udevice;
 121         struct name_entry *name_loop;
 122         char buf[4096];
 123         size_t bufpos = 0;
 124         ssize_t count;
 125         char path[UTIL_PATH_SIZE];
 126         int fd;
 127         char link_target[UTIL_PATH_SIZE];
 128         int len;
 129         const char *devpath = &syspath[strlen(udev_get_sys_path(udev))];
 130         int err = 0;
 131
 132         if (verbose)
 133                 printf("%s\n", devpath);
 134
 135         udevice = udev_device_init(udev);
 136         if (udevice == NULL)
 137                 return -1;
 138         udev_db_get_device(udevice, devpath);
 139
 140         /* add header */
 141         bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
 142         bufpos++;
 143
 144         /* add cookie */
 145         if (env != NULL) {
 146                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "%s", env);
 147                 bufpos++;
 148         }
 149
 150         /* add standard keys */
 151         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVPATH=%s", devpath);
 152         bufpos++;
 153         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "ACTION=%s", action);
 154         bufpos++;
 155
 156         /* add subsystem */
 157         util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
 158         util_strlcat(path, devpath, sizeof(path));
 159         util_strlcat(path, "/subsystem", sizeof(path));
 160         len = readlink(path, link_target, sizeof(link_target));
 161         if (len > 0) {
 162                 char *pos;
 163
 164                 link_target[len] = '\0';
 165                 pos = strrchr(link_target, '/');
 166                 if (pos != NULL) {
 167                         bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "SUBSYSTEM=%s", &pos[1]);
 168                         bufpos++;
 169                 }
 170         }
 171
 172         /* add symlinks and node name */
 173         path[0] = '\0';
 174         list_for_each_entry(name_loop, &udevice->symlink_list, node) {
 175                 util_strlcat(path, udev_get_dev_path(udev), sizeof(path));
 176                 util_strlcat(path, "/", sizeof(path));
 177                 util_strlcat(path, name_loop->name, sizeof(path));
 178                 util_strlcat(path, " ", sizeof(path));
 179         }
 180         util_remove_trailing_chars(path, ' ');
 181         if (path[0] != '\0') {
 182                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVLINKS=%s", path);
 183                 bufpos++;
 184         }
 185         if (udevice->name[0] != '\0') {
 186                 util_strlcpy(path, udev_get_dev_path(udev), sizeof(path));
 187                 util_strlcat(path, "/", sizeof(path));
 188                 util_strlcat(path, udevice->name, sizeof(path));
 189                 bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVNAME=%s", path);
 190                 bufpos++;
 191         }
 192
 193         /* add keys from device "uevent" file */
 194         util_strlcpy(path, syspath, sizeof(path));
 195         util_strlcat(path, "/uevent", sizeof(path));
 196         fd = open(path, O_RDONLY);
 197         if (fd >= 0) {
 198                 char value[4096];
 199
 200                 count = read(fd, value, sizeof(value));
 201                 close(fd);
 202                 if (count > 0) {
 203                         char *key;
 204
 205                         value[count] = '\0';
 206                         key = value;
 207                         while (key[0] != '\0') {
 208                                 char *next;
 209
 210                                 next = strchr(key, '\n');
 211                                 if (next == NULL)
 212                                         break;
 213                                 next[0] = '\0';
 214                                 bufpos += util_strlcpy(&buf[bufpos], key, sizeof(buf) - bufpos-1);
 215                                 bufpos++;
 216                                 key = &next[1];
 217                         }
 218                 }
 219         }
 220
 221         /* add keys from database */
 222         list_for_each_entry(name_loop, &udevice->env_list, node) {
 223                 bufpos += util_strlcpy(&buf[bufpos], name_loop->name, sizeof(buf) - bufpos-1);
 224                 bufpos++;
 225         }
 226         if (bufpos > sizeof(buf))
 227                 bufpos = sizeof(buf);
 228
 229         count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, saddrlen);
 230         if (count < 0)
 231                 err = -1;
 232
 233         return err;
 234 }
 235
 236 static void exec_list(struct udev *udev, const char *action, const char *env)
 237 {
 238         struct name_entry *loop_device;
 239         struct name_entry *tmp_device;
 240
 241         list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
 242                 if (delay_device(loop_device->name))
 243                         continue;
 244                 if (sock >= 0)
 245                         pass_to_socket(udev, loop_device->name, action, env);
 246                 else
 247                         trigger_uevent(udev, loop_device->name, action);
 248                 list_del(&loop_device->node);
 249                 free(loop_device);
 250         }
 251
 252         /* trigger remaining delayed devices */
 253         list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
 254                 if (sock >= 0)
 255                         pass_to_socket(udev, loop_device->name, action, env);
 256                 else
 257                         trigger_uevent(udev, loop_device->name, action);
 258                 list_del(&loop_device->node);
 259                 free(loop_device);
 260         }
 261 }
 262
 263 static int subsystem_filtered(const char *subsystem)
 264 {
 265         struct name_entry *loop_name;
 266
 267         /* skip devices matching the listed subsystems */
 268         list_for_each_entry(loop_name, &filter_subsystem_nomatch_list, node)
 269                 if (fnmatch(loop_name->name, subsystem, 0) == 0)
 270                         return 1;
 271
 272         /* skip devices not matching the listed subsystems */
 273         if (!list_empty(&filter_subsystem_match_list)) {
 274                 list_for_each_entry(loop_name, &filter_subsystem_match_list, node)
 275                         if (fnmatch(loop_name->name, subsystem, 0) == 0)
 276                                 return 0;
 277                 return 1;
 278         }
 279
 280         return 0;
 281 }
 282
 283 static int attr_match(const char *path, const char *attr_value)
 284 {
 285         char attr[UTIL_NAME_SIZE];
 286         char file[UTIL_PATH_SIZE];
 287         char *match_value;
 288
 289         util_strlcpy(attr, attr_value, sizeof(attr));
 290
 291         /* separate attr and match value */
 292         match_value = strchr(attr, '=');
 293         if (match_value != NULL) {
 294                 match_value[0] = '\0';
 295                 match_value = &match_value[1];
 296         }
 297
 298         util_strlcpy(file, path, sizeof(file));
 299         util_strlcat(file, "/", sizeof(file));
 300         util_strlcat(file, attr, sizeof(file));
 301
 302         if (match_value != NULL) {
 303                 /* match file content */
 304                 char value[UTIL_NAME_SIZE];
 305                 int fd;
 306                 ssize_t size;
 307
 308                 fd = open(file, O_RDONLY);
 309                 if (fd < 0)
 310                         return 0;
 311                 size = read(fd, value, sizeof(value));
 312                 close(fd);
 313                 if (size < 0)
 314                         return 0;
 315                 value[size] = '\0';
 316                 util_remove_trailing_chars(value, '\n');
 317
 318                 /* match if attribute value matches */
 319                 if (fnmatch(match_value, value, 0) == 0)
 320                         return 1;
 321         } else {
 322                 /* match if attribute exists */
 323                 struct stat statbuf;
 324
 325                 if (stat(file, &statbuf) == 0)
 326                         return 1;
 327         }
 328         return 0;
 329 }
 330
 331 static int attr_filtered(const char *path)
 332 {
 333         struct name_entry *loop_name;
 334
 335         /* skip devices matching the listed sysfs attributes */
 336         list_for_each_entry(loop_name, &filter_attr_nomatch_list, node)
 337                 if (attr_match(path, loop_name->name))
 338                         return 1;
 339
 340         /* skip devices not matching the listed sysfs attributes */
 341         if (!list_empty(&filter_attr_match_list)) {
 342                 list_for_each_entry(loop_name, &filter_attr_match_list, node)
 343                         if (attr_match(path, loop_name->name))
 344                                 return 0;
 345                 return 1;
 346         }
 347         return 0;
 348 }
 349
 350 enum scan_type {
 351         SCAN_DEVICES,
 352         SCAN_SUBSYSTEM,
 353 };
 354
 355 static void scan_subsystem(struct udev *udev, const char *subsys, enum scan_type scan)
 356 {
 357         char base[UTIL_PATH_SIZE];
 358         DIR *dir;
 359         struct dirent *dent;
 360         const char *subdir;
 361
 362         if (scan == SCAN_DEVICES)
 363                 subdir = "/devices";
 364         else if (scan == SCAN_SUBSYSTEM)
 365                 subdir = "/drivers";
 366         else
 367                 return;
 368
 369         util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
 370         util_strlcat(base, "/", sizeof(base));
 371         util_strlcat(base, subsys, sizeof(base));
 372
 373         dir = opendir(base);
 374         if (dir != NULL) {
 375                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 376                         char dirname[UTIL_PATH_SIZE];
 377                         DIR *dir2;
 378                         struct dirent *dent2;
 379
 380                         if (dent->d_name[0] == '.')
 381                                 continue;
 382
 383                         if (scan == SCAN_DEVICES)
 384                                 if (subsystem_filtered(dent->d_name))
 385                                         continue;
 386
 387                         util_strlcpy(dirname, base, sizeof(dirname));
 388                         util_strlcat(dirname, "/", sizeof(dirname));
 389                         util_strlcat(dirname, dent->d_name, sizeof(dirname));
 390
 391                         if (scan == SCAN_SUBSYSTEM) {
 392                                 if (attr_filtered(dirname))
 393                                         continue;
 394                                 if (!subsystem_filtered("subsystem"))
 395                                         device_list_insert(udev, dirname);
 396                                 if (subsystem_filtered("drivers"))
 397                                         continue;
 398                         }
 399
 400                         util_strlcat(dirname, subdir, sizeof(dirname));
 401
 402                         /* look for devices/drivers */
 403                         dir2 = opendir(dirname);
 404                         if (dir2 != NULL) {
 405                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 406                                         char dirname2[UTIL_PATH_SIZE];
 407
 408                                         if (dent2->d_name[0] == '.')
 409                                                 continue;
 410
 411                                         util_strlcpy(dirname2, dirname, sizeof(dirname2));
 412                                         util_strlcat(dirname2, "/", sizeof(dirname2));
 413                                         util_strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 414                                         if (attr_filtered(dirname2))
 415                                                 continue;
 416                                         device_list_insert(udev, dirname2);
 417                                 }
 418                                 closedir(dir2);
 419                         }
 420                 }
 421                 closedir(dir);
 422         }
 423 }
 424
 425 static void scan_block(struct udev *udev)
 426 {
 427         char base[UTIL_PATH_SIZE];
 428         DIR *dir;
 429         struct dirent *dent;
 430
 431         if (subsystem_filtered("block"))
 432                 return;
 433
 434         util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
 435         util_strlcat(base, "/block", sizeof(base));
 436
 437         dir = opendir(base);
 438         if (dir != NULL) {
 439                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 440                         char dirname[UTIL_PATH_SIZE];
 441                         DIR *dir2;
 442                         struct dirent *dent2;
 443
 444                         if (dent->d_name[0] == '.')
 445                                 continue;
 446
 447                         util_strlcpy(dirname, base, sizeof(dirname));
 448                         util_strlcat(dirname, "/", sizeof(dirname));
 449                         util_strlcat(dirname, dent->d_name, sizeof(dirname));
 450                         if (attr_filtered(dirname))
 451                                 continue;
 452                         if (device_list_insert(udev, dirname) != 0)
 453                                 continue;
 454
 455                         /* look for partitions */
 456                         dir2 = opendir(dirname);
 457                         if (dir2 != NULL) {
 458                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 459                                         char dirname2[UTIL_PATH_SIZE];
 460
 461                                         if (dent2->d_name[0] == '.')
 462                                                 continue;
 463
 464                                         if (!strcmp(dent2->d_name,"device"))
 465                                                 continue;
 466
 467                                         util_strlcpy(dirname2, dirname, sizeof(dirname2));
 468                                         util_strlcat(dirname2, "/", sizeof(dirname2));
 469                                         util_strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 470                                         if (attr_filtered(dirname2))
 471                                                 continue;
 472                                         device_list_insert(udev, dirname2);
 473                                 }
 474                                 closedir(dir2);
 475                         }
 476                 }
 477                 closedir(dir);
 478         }
 479 }
 480
 481 static void scan_class(struct udev *udev)
 482 {
 483         char base[UTIL_PATH_SIZE];
 484         DIR *dir;
 485         struct dirent *dent;
 486
 487         util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
 488         util_strlcat(base, "/class", sizeof(base));
 489
 490         dir = opendir(base);
 491         if (dir != NULL) {
 492                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 493                         char dirname[UTIL_PATH_SIZE];
 494                         DIR *dir2;
 495                         struct dirent *dent2;
 496
 497                         if (dent->d_name[0] == '.')
 498                                 continue;
 499
 500                         if (subsystem_filtered(dent->d_name))
 501                                 continue;
 502
 503                         util_strlcpy(dirname, base, sizeof(dirname));
 504                         util_strlcat(dirname, "/", sizeof(dirname));
 505                         util_strlcat(dirname, dent->d_name, sizeof(dirname));
 506                         dir2 = opendir(dirname);
 507                         if (dir2 != NULL) {
 508                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
 509                                         char dirname2[UTIL_PATH_SIZE];
 510
 511                                         if (dent2->d_name[0] == '.')
 512                                                 continue;
 513
 514                                         if (!strcmp(dent2->d_name, "device"))
 515                                                 continue;
 516
 517                                         util_strlcpy(dirname2, dirname, sizeof(dirname2));
 518                                         util_strlcat(dirname2, "/", sizeof(dirname2));
 519                                         util_strlcat(dirname2, dent2->d_name, sizeof(dirname2));
 520                                         if (attr_filtered(dirname2))
 521                                                 continue;
 522                                         device_list_insert(udev, dirname2);
 523                                 }
 524                                 closedir(dir2);
 525                         }
 526                 }
 527                 closedir(dir);
 528         }
 529 }
 530
 531 static void scan_failed(struct udev *udev)
 532 {
 533         char base[UTIL_PATH_SIZE];
 534         DIR *dir;
 535         struct dirent *dent;
 536
 537         util_strlcpy(base, udev_get_dev_path(udev), sizeof(base));
 538         util_strlcat(base, "/.udev/failed", sizeof(base));
 539
 540         dir = opendir(base);
 541         if (dir != NULL) {
 542                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 543                         char device[UTIL_PATH_SIZE];
 544                         size_t start;
 545
 546                         if (dent->d_name[0] == '.')
 547                                 continue;
 548
 549                         start = util_strlcpy(device, udev_get_sys_path(udev), sizeof(device));
 550                         if(start >= sizeof(device))
 551                                 start = sizeof(device) - 1;
 552                         util_strlcat(device, dent->d_name, sizeof(device));
 553                         util_path_decode(&device[start]);
 554                         device_list_insert(udev, device);
 555                 }
 556                 closedir(dir);
 557         }
 558 }
 559
 560 int udevadm_trigger(struct udev *udev, int argc, char *argv[])
 561 {
 562         int failed = 0;
 563         const char *sockpath = NULL;
 564         int option;
 565         const char *action = "add";
 566         const char *env = NULL;
 567         static const struct option options[] = {
 568                 { "verbose", 0, NULL, 'v' },
 569                 { "dry-run", 0, NULL, 'n' },
 570                 { "retry-failed", 0, NULL, 'F' },
 571                 { "socket", 1, NULL, 'o' },
 572                 { "help", 0, NULL, 'h' },
 573                 { "action", 1, NULL, 'c' },
 574                 { "subsystem-match", 1, NULL, 's' },
 575                 { "subsystem-nomatch", 1, NULL, 'S' },
 576                 { "attr-match", 1, NULL, 'a' },
 577                 { "attr-nomatch", 1, NULL, 'A' },
 578                 { "env", 1, NULL, 'e' },
 579                 {}
 580         };
 581
 582         dbg(udev, "version %s\n", VERSION);
 583
 584         while (1) {
 585                 option = getopt_long(argc, argv, "vnFo:hce::s:S:a:A:", options, NULL);
 586                 if (option == -1)
 587                         break;
 588
 589                 switch (option) {
 590                 case 'v':
 591                         verbose = 1;
 592                         break;
 593                 case 'n':
 594                         dry_run = 1;
 595                         break;
 596                 case 'F':
 597                         failed = 1;
 598                         break;
 599                 case 'o':
 600                         sockpath = optarg;
 601                         break;
 602                 case 'c':
 603                         action = optarg;
 604                         break;
 605                 case 'e':
 606                         if (strchr(optarg, '=') != NULL)
 607                                 env = optarg;
 608                         break;
 609                 case 's':
 610                         name_list_add(udev, &filter_subsystem_match_list, optarg, 0);
 611                         break;
 612                 case 'S':
 613                         name_list_add(udev, &filter_subsystem_nomatch_list, optarg, 0);
 614                         break;
 615                 case 'a':
 616                         name_list_add(udev, &filter_attr_match_list, optarg, 0);
 617                         break;
 618                 case 'A':
 619                         name_list_add(udev, &filter_attr_nomatch_list, optarg, 0);
 620                         break;
 621                 case 'h':
 622                         printf("Usage: udevadm trigger OPTIONS\n"
 623                                "  --verbose                       print the list of devices while running\n"
 624                                "  --dry-run                       do not actually trigger the events\n"
 625                                "  --retry-failed                  trigger only the events which have been\n"
 626                                "                                  marked as failed during a previous run\n"
 627                                "  --socket=<socket path>          pass events to socket instead of triggering kernel events\n"
 628                                "  --env=<KEY>=<value>             pass an additional key (works only with --socket=)\n"
 629                                "  --subsystem-match=<subsystem>   trigger devices from a matching subystem\n"
 630                                "  --subsystem-nomatch=<subsystem> exclude devices from a matching subystem\n"
 631                                "  --attr-match=<file[=<value>]>   trigger devices with a matching sysfs\n"
 632                                "                                  attribute\n"
 633                                "  --attr-nomatch=<file[=<value>]> exclude devices with a matching sysfs\n"
 634                                "                                  attribute\n"
 635                                "  --help                          print this text\n"
 636                                "\n");
 637                         goto exit;
 638                 default:
 639                         goto exit;
 640                 }
 641         }
 642
 643         if (sockpath != NULL) {
 644                 struct stat stats;
 645
 646                 sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 647                 memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 648                 saddr.sun_family = AF_LOCAL;
 649                 if (sockpath[0] == '@') {
 650                         /* abstract namespace socket requested */
 651                         util_strlcpy(&saddr.sun_path[1], &sockpath[1], sizeof(saddr.sun_path)-1);
 652                         saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 653                 } else if (stat(sockpath, &stats) == 0 && S_ISSOCK(stats.st_mode)) {
 654                         /* existing socket file */
 655                         util_strlcpy(saddr.sun_path, sockpath, sizeof(saddr.sun_path));
 656                         saddrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
 657                 } else {
 658                         /* no socket file, assume abstract namespace socket */
 659                         util_strlcpy(&saddr.sun_path[1], sockpath, sizeof(saddr.sun_path)-1);
 660                         saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 661                 }
 662         } else if (env != NULL) {
 663                 fprintf(stderr, "error: --env= only valid with --socket= option\n");
 664                 goto exit;
 665         }
 666
 667         if (failed) {
 668                 scan_failed(udev);
 669                 exec_list(udev, action, env);
 670         } else {
 671                 char base[UTIL_PATH_SIZE];
 672                 struct stat statbuf;
 673
 674                 /* if we have /sys/subsystem, forget all the old stuff */
 675                 util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
 676                 util_strlcat(base, "/subsystem", sizeof(base));
 677                 if (stat(base, &statbuf) == 0) {
 678                         scan_subsystem(udev, "subsystem", SCAN_SUBSYSTEM);
 679                         exec_list(udev, action, env);
 680                         scan_subsystem(udev, "subsystem", SCAN_DEVICES);
 681                         exec_list(udev, action, env);
 682                 } else {
 683                         scan_subsystem(udev, "bus", SCAN_SUBSYSTEM);
 684                         exec_list(udev, action, env);
 685                         scan_subsystem(udev, "bus", SCAN_DEVICES);
 686                         scan_class(udev);
 687
 688                         /* scan "block" if it isn't a "class" */
 689                         util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
 690                         util_strlcat(base, "/class/block", sizeof(base));
 691                         if (stat(base, &statbuf) != 0)
 692                                 scan_block(udev);
 693                         exec_list(udev, action, env);
 694                 }
 695         }
 696
 697 exit:
 698         name_list_cleanup(udev, &filter_subsystem_match_list);
 699         name_list_cleanup(udev, &filter_subsystem_nomatch_list);
 700         name_list_cleanup(udev, &filter_attr_match_list);
 701         name_list_cleanup(udev, &filter_attr_nomatch_list);
 702
 703         if (sock >= 0)
 704                 close(sock);
 705         return 0;
 706 }