udev_rules_parse.c

   1 /*
   2  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   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 <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <ctype.h>
  25 #include <unistd.h>
  26 #include <sys/stat.h>
  27 #include <errno.h>
  28
  29 #include "udev.h"
  30 #include "udev_rules.h"
  31
  32
  33 void udev_rules_iter_init(struct udev_rules *rules)
  34 {
  35         dbg("bufsize=%zi", rules->bufsize);
  36         rules->current = 0;
  37 }
  38
  39 struct udev_rule *udev_rules_iter_next(struct udev_rules *rules)
  40 {
  41         static struct udev_rule *rule;
  42
  43         if (!rules)
  44                 return NULL;
  45
  46         dbg("current=%zi", rules->current);
  47         if (rules->current >= rules->bufsize) {
  48                 dbg("no more rules");
  49                 return NULL;
  50         }
  51
  52         /* get next rule */
  53         rule = (struct udev_rule *) (rules->buf + rules->current);
  54         rules->current += sizeof(struct udev_rule) + rule->bufsize;
  55
  56         return rule;
  57 }
  58
  59 struct udev_rule *udev_rules_iter_label(struct udev_rules *rules, const char *label)
  60 {
  61         static struct udev_rule *rule;
  62
  63 next:
  64         dbg("current=%zi", rules->current);
  65         if (rules->current >= rules->bufsize) {
  66                 dbg("no more rules");
  67                 return NULL;
  68         }
  69         rule = (struct udev_rule *) (rules->buf + rules->current);
  70
  71         if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
  72                 dbg("moving forward, looking for label '%s'", label);
  73                 rules->current += sizeof(struct udev_rule) + rule->bufsize;
  74                 goto next;
  75         }
  76
  77         dbg("found label '%s'", label);
  78         return rule;
  79 }
  80
  81 static int get_key(char **line, char **key, enum key_operation *operation, char **value)
  82 {
  83         char *linepos;
  84         char *temp;
  85
  86         linepos = *line;
  87         if (linepos == NULL && linepos[0] == '\0')
  88                 return -1;
  89
  90         /* skip whitespace */
  91         while (isspace(linepos[0]) || linepos[0] == ',')
  92                 linepos++;
  93
  94         /* get the key */
  95         if (linepos[0] == '\0')
  96                 return -1;
  97         *key = linepos;
  98
  99         while (1) {
 100                 linepos++;
 101                 if (linepos[0] == '\0')
 102                         return -1;
 103                 if (isspace(linepos[0]))
 104                         break;
 105                 if (linepos[0] == '=')
 106                         break;
 107                 if (linepos[0] == '+')
 108                         break;
 109                 if (linepos[0] == '!')
 110                         break;
 111                 if (linepos[0] == ':')
 112                         break;
 113         }
 114
 115         /* remember end of key */
 116         temp = linepos;
 117
 118         /* skip whitespace after key */
 119         while (isspace(linepos[0]))
 120                 linepos++;
 121         if (linepos[0] == '\0')
 122                 return -1;
 123
 124         /* get operation type */
 125         if (linepos[0] == '=' && linepos[1] == '=') {
 126                 *operation = KEY_OP_MATCH;
 127                 linepos += 2;
 128                 dbg("operator=match");
 129         } else if (linepos[0] == '!' && linepos[1] == '=') {
 130                 *operation = KEY_OP_NOMATCH;
 131                 linepos += 2;
 132                 dbg("operator=nomatch");
 133         } else if (linepos[0] == '+' && linepos[1] == '=') {
 134                 *operation = KEY_OP_ADD;
 135                 linepos += 2;
 136                 dbg("operator=add");
 137         } else if (linepos[0] == '=') {
 138                 *operation = KEY_OP_ASSIGN;
 139                 linepos++;
 140                 dbg("operator=assign");
 141         } else if (linepos[0] == ':' && linepos[1] == '=') {
 142                 *operation = KEY_OP_ASSIGN_FINAL;
 143                 linepos += 2;
 144                 dbg("operator=assign_final");
 145         } else
 146                 return -1;
 147
 148         /* terminate key */
 149         temp[0] = '\0';
 150         dbg("key='%s'", *key);
 151
 152         /* skip whitespace after operator */
 153         while (isspace(linepos[0]))
 154                 linepos++;
 155         if (linepos[0] == '\0')
 156                 return -1;
 157
 158         /* get the value*/
 159         if (linepos[0] == '"')
 160                 linepos++;
 161         else
 162                 return -1;
 163         *value = linepos;
 164
 165         temp = strchr(linepos, '"');
 166         if (!temp)
 167                 return -1;
 168         temp[0] = '\0';
 169         temp++;
 170         dbg("value='%s'", *value);
 171
 172         /* move line to next key */
 173         *line = temp;
 174
 175         return 0;
 176 }
 177
 178 /* extract possible KEY{attr} */
 179 static char *get_key_attribute(char *str)
 180 {
 181         char *pos;
 182         char *attr;
 183
 184         attr = strchr(str, '{');
 185         if (attr != NULL) {
 186                 attr++;
 187                 pos = strchr(attr, '}');
 188                 if (pos == NULL) {
 189                         err("missing closing brace for format");
 190                         return NULL;
 191                 }
 192                 pos[0] = '\0';
 193                 dbg("attribute='%s'", attr);
 194                 return attr;
 195         }
 196
 197         return NULL;
 198 }
 199
 200 static int add_rule_key(struct udev_rule *rule, struct key *key,
 201                         enum key_operation operation, const char *value)
 202 {
 203         size_t val_len = strnlen(value, PATH_SIZE);
 204
 205         key->operation = operation;
 206
 207         key->val_off = rule->bufsize;
 208         strlcpy(rule->buf + rule->bufsize, value, val_len+1);
 209         rule->bufsize += val_len+1;
 210
 211         return 0;
 212 }
 213
 214 static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
 215                              enum key_operation operation, const char *key, const char *value)
 216 {
 217         size_t key_len = strnlen(key, PATH_SIZE);
 218
 219         if (pairs->count >= PAIRS_MAX) {
 220                 err("skip, too many keys of the same type in a single rule");
 221                 return -1;
 222         }
 223
 224         add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
 225
 226         /* add the key-name of the pair */
 227         pairs->keys[pairs->count].key_name_off = rule->bufsize;
 228         strlcpy(rule->buf + rule->bufsize, key, key_len+1);
 229         rule->bufsize += key_len+1;
 230
 231         pairs->count++;
 232
 233         return 0;
 234 }
 235
 236 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
 237 {
 238         struct udev_rule *rule;
 239         size_t rule_size;
 240         int valid;
 241         char *linepos;
 242         char *attr;
 243         size_t padding;
 244         int physdev = 0;
 245         int retval;
 246
 247         /* get all the keys */
 248         rule = calloc(1, sizeof (struct udev_rule) + LINE_SIZE);
 249         if (!rule) {
 250                 err("malloc failed");
 251                 return -1;
 252         }
 253         linepos = line;
 254         valid = 0;
 255
 256         while (1) {
 257                 char *key;
 258                 char *value;
 259                 enum key_operation operation = KEY_OP_UNSET;
 260
 261                 retval = get_key(&linepos, &key, &operation, &value);
 262                 if (retval)
 263                         break;
 264
 265                 if (strcasecmp(key, "ACTION") == 0) {
 266                         if (operation != KEY_OP_MATCH &&
 267                             operation != KEY_OP_NOMATCH) {
 268                                 err("invalid ACTION operation");
 269                                 goto invalid;
 270                         }
 271                         add_rule_key(rule, &rule->action, operation, value);
 272                         valid = 1;
 273                         continue;
 274                 }
 275
 276                 if (strcasecmp(key, "DEVPATH") == 0) {
 277                         if (operation != KEY_OP_MATCH &&
 278                             operation != KEY_OP_NOMATCH) {
 279                                 err("invalid DEVPATH operation");
 280                                 goto invalid;
 281                         }
 282                         add_rule_key(rule, &rule->devpath, operation, value);
 283                         valid = 1;
 284                         continue;
 285                 }
 286
 287                 if (strcasecmp(key, "KERNEL") == 0) {
 288                         if (operation != KEY_OP_MATCH &&
 289                             operation != KEY_OP_NOMATCH) {
 290                                 err("invalid KERNEL operation");
 291                                 goto invalid;
 292                         }
 293                         add_rule_key(rule, &rule->kernel, operation, value);
 294                         valid = 1;
 295                         continue;
 296                 }
 297
 298                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 299                         if (operation != KEY_OP_MATCH &&
 300                             operation != KEY_OP_NOMATCH) {
 301                                 err("invalid SUBSYSTEM operation");
 302                                 goto invalid;
 303                         }
 304                         add_rule_key(rule, &rule->subsystem, operation, value);
 305                         valid = 1;
 306                         continue;
 307                 }
 308
 309                 if (strcasecmp(key, "DRIVER") == 0) {
 310                         if (operation != KEY_OP_MATCH &&
 311                             operation != KEY_OP_NOMATCH) {
 312                                 err("invalid DRIVER operation");
 313                                 goto invalid;
 314                         }
 315                         err("DRIVER== will change in a future relase, "
 316                             "please use DRIVERS== in %s:%u", filename, lineno);
 317                         /* FIXME: this should be rule->driver to match only the event device */
 318                         add_rule_key(rule, &rule->drivers, operation, value);
 319                         valid = 1;
 320                         continue;
 321                 }
 322
 323                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 324                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 325                         if (attr == NULL) {
 326                                 err("error parsing ATTR attribute");
 327                                 goto invalid;
 328                         }
 329                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 330                                 goto invalid;
 331                         valid = 1;
 332                         continue;
 333                 }
 334
 335                 if (strcasecmp(key, "KERNELS") == 0 ||
 336                     strcasecmp(key, "ID") == 0) {
 337                         if (operation != KEY_OP_MATCH &&
 338                             operation != KEY_OP_NOMATCH) {
 339                                 err("invalid KERNELS operation");
 340                                 goto invalid;
 341                         }
 342                         add_rule_key(rule, &rule->kernels, operation, value);
 343                         valid = 1;
 344                         continue;
 345                 }
 346
 347                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 348                     strcasecmp(key, "BUS") == 0) {
 349                         if (operation != KEY_OP_MATCH &&
 350                             operation != KEY_OP_NOMATCH) {
 351                                 err("invalid SUBSYSTEMS operation");
 352                                 goto invalid;
 353                         }
 354                         add_rule_key(rule, &rule->subsystems, operation, value);
 355                         valid = 1;
 356                         continue;
 357                 }
 358
 359                 if (strcasecmp(key, "DRIVERS") == 0) {
 360                         if (operation != KEY_OP_MATCH &&
 361                             operation != KEY_OP_NOMATCH) {
 362                                 err("invalid DRIVERS operation");
 363                                 goto invalid;
 364                         }
 365                         add_rule_key(rule, &rule->drivers, operation, value);
 366                         valid = 1;
 367                         continue;
 368                 }
 369
 370                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 371                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 372                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 373                         if (attr == NULL) {
 374                                 err("error parsing ATTRS attribute");
 375                                 goto invalid;
 376                         }
 377                         if (strncmp(attr, "device/", 7) == 0)
 378                                 err("the 'device' link is deprecated and will be removed from a future kernel, "
 379                                     "please fix it in %s:%u", filename, lineno);
 380                         else if (strchr(attr, '/') != NULL)
 381                                 err("do not reference parent sysfs directories directly, that may break with a future kernel, "
 382                                     "please fix it in %s:%u", filename, lineno);
 383                         if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 384                                 goto invalid;
 385                         valid = 1;
 386                         continue;
 387                 }
 388
 389                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 390                         attr = get_key_attribute(key + sizeof("ENV")-1);
 391                         if (attr == NULL) {
 392                                 err("error parsing ENV attribute");
 393                                 goto invalid;
 394                         }
 395                         if (strncmp(attr, "PHYSDEV", 7) == 0)
 396                                 physdev = 1;
 397                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 398                                 goto invalid;
 399                         valid = 1;
 400                         continue;
 401                 }
 402
 403                 if (strcasecmp(key, "PROGRAM") == 0) {
 404                         add_rule_key(rule, &rule->program, operation, value);
 405                         valid = 1;
 406                         continue;
 407                 }
 408
 409                 if (strcasecmp(key, "RESULT") == 0) {
 410                         if (operation != KEY_OP_MATCH &&
 411                             operation != KEY_OP_NOMATCH) {
 412                                 err("invalid RESULT operation");
 413                                 goto invalid;
 414                         }
 415                         add_rule_key(rule, &rule->result, operation, value);
 416                         valid = 1;
 417                         continue;
 418                 }
 419
 420                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 421                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 422                         if (attr && strstr(attr, "program")) {
 423                                 dbg("IMPORT will be executed");
 424                                 rule->import_type  = IMPORT_PROGRAM;
 425                         } else if (attr && strstr(attr, "file")) {
 426                                 dbg("IMPORT will be included as file");
 427                                 rule->import_type  = IMPORT_FILE;
 428                         } else if (attr && strstr(attr, "parent")) {
 429                                 dbg("IMPORT will include the parent values");
 430                                 rule->import_type = IMPORT_PARENT;
 431                         } else {
 432                                 /* figure it out if it is executable */
 433                                 char file[PATH_SIZE];
 434                                 char *pos;
 435                                 struct stat stats;
 436
 437                                 strlcpy(file, value, sizeof(file));
 438                                 pos = strchr(file, ' ');
 439                                 if (pos)
 440                                         pos[0] = '\0';
 441
 442                                 /* allow programs in /lib/udev called without the path */
 443                                 if (strchr(file, '/') == NULL) {
 444                                         strlcpy(file, "/lib/udev/", sizeof(file));
 445                                         strlcat(file, value, sizeof(file));
 446                                         pos = strchr(file, ' ');
 447                                         if (pos)
 448                                                 pos[0] = '\0';
 449                                 }
 450
 451                                 dbg("IMPORT auto mode for '%s'", file);
 452                                 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
 453                                         dbg("IMPORT is executable, will be executed (autotype)");
 454                                         rule->import_type  = IMPORT_PROGRAM;
 455                                 } else {
 456                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 457                                         rule->import_type  = IMPORT_FILE;
 458                                 }
 459                         }
 460                         add_rule_key(rule, &rule->import, operation, value);
 461                         valid = 1;
 462                         continue;
 463                 }
 464
 465                 if (strcasecmp(key, "RUN") == 0) {
 466                         add_rule_key(rule, &rule->run, operation, value);
 467                         valid = 1;
 468                         continue;
 469                 }
 470
 471                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 472                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 473                         valid = 1;
 474                         continue;
 475                 }
 476
 477                 if (strcasecmp(key, "LABEL") == 0) {
 478                         add_rule_key(rule, &rule->label, operation, value);
 479                         valid = 1;
 480                         continue;
 481                 }
 482
 483                 if (strcasecmp(key, "GOTO") == 0) {
 484                         add_rule_key(rule, &rule->goto_label, operation, value);
 485                         valid = 1;
 486                         continue;
 487                 }
 488
 489                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 490                         attr = get_key_attribute(key + sizeof("NAME")-1);
 491                         if (attr != NULL) {
 492                                 if (strstr(attr, "all_partitions") != NULL) {
 493                                         dbg("creation of partition nodes requested");
 494                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 495                                 }
 496                                 if (strstr(attr, "ignore_remove") != NULL) {
 497                                         dbg("remove event should be ignored");
 498                                         rule->ignore_remove = 1;
 499                                 }
 500                         }
 501                         if (value[0] == '\0')
 502                                 dbg("name empty, node creation supressed");
 503                         add_rule_key(rule, &rule->name, operation, value);
 504                         continue;
 505                 }
 506
 507                 if (strcasecmp(key, "SYMLINK") == 0) {
 508                         add_rule_key(rule, &rule->symlink, operation, value);
 509                         valid = 1;
 510                         continue;
 511                 }
 512
 513                 if (strcasecmp(key, "OWNER") == 0) {
 514                         valid = 1;
 515                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 516                                 char *endptr;
 517                                 strtoul(value, &endptr, 10);
 518                                 if (endptr[0] != '\0') {
 519                                         char owner[32];
 520                                         uid_t uid = lookup_user(value);
 521                                         dbg("replacing username='%s' by id=%i", value, uid);
 522                                         sprintf(owner, "%u", (unsigned int) uid);
 523                                         add_rule_key(rule, &rule->owner, operation, owner);
 524                                         continue;
 525                                 }
 526                         }
 527
 528                         add_rule_key(rule, &rule->owner, operation, value);
 529                         continue;
 530                 }
 531
 532                 if (strcasecmp(key, "GROUP") == 0) {
 533                         valid = 1;
 534                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 535                                 char *endptr;
 536                                 strtoul(value, &endptr, 10);
 537                                 if (endptr[0] != '\0') {
 538                                         char group[32];
 539                                         gid_t gid = lookup_group(value);
 540                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 541                                         sprintf(group, "%u", (unsigned int) gid);
 542                                         add_rule_key(rule, &rule->group, operation, group);
 543                                         continue;
 544                                 }
 545                         }
 546
 547                         add_rule_key(rule, &rule->group, operation, value);
 548                         continue;
 549                 }
 550
 551                 if (strcasecmp(key, "MODE") == 0) {
 552                         rule->mode = strtol(value, NULL, 8);
 553                         rule->mode_operation = operation;
 554                         valid = 1;
 555                         continue;
 556                 }
 557
 558                 if (strcasecmp(key, "OPTIONS") == 0) {
 559                         if (strstr(value, "last_rule") != NULL) {
 560                                 dbg("last rule to be applied");
 561                                 rule->last_rule = 1;
 562                         }
 563                         if (strstr(value, "ignore_device") != NULL) {
 564                                 dbg("device should be ignored");
 565                                 rule->ignore_device = 1;
 566                         }
 567                         if (strstr(value, "ignore_remove") != NULL) {
 568                                 dbg("remove event should be ignored");
 569                                 rule->ignore_remove = 1;
 570                         }
 571                         if (strstr(value, "all_partitions") != NULL) {
 572                                 dbg("creation of partition nodes requested");
 573                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 574                         }
 575                         valid = 1;
 576                         continue;
 577                 }
 578
 579                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 580         }
 581
 582         if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
 583                 err("PHYSDEV* values are deprecated and will be removed from a future kernel, "
 584                     "please fix it in %s:%u", filename, lineno);
 585
 586         /* skip line if not any valid key was found */
 587         if (!valid)
 588                 goto invalid;
 589
 590         /* grow buffer and add rule */
 591         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 592         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 593         dbg("add %zi padding bytes", padding);
 594         rule_size += padding;
 595         rule->bufsize += padding;
 596
 597         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 598         if (!rules->buf) {
 599                 err("realloc failed");
 600                 goto exit;
 601         }
 602         dbg("adding rule to offset %zi", rules->bufsize);
 603         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 604         rules->bufsize += rule_size;
 605 exit:
 606         free(rule);
 607         return 0;
 608
 609 invalid:
 610         free(rule);
 611         err("invalid rule '%s:%u'", filename, lineno);
 612         return -1;
 613 }
 614
 615 static int parse_file(struct udev_rules *rules, const char *filename)
 616 {
 617         char line[LINE_SIZE];
 618         char *bufline;
 619         unsigned int lineno;
 620         char *buf;
 621         size_t bufsize;
 622         size_t cur;
 623         size_t count;
 624         int retval = 0;
 625
 626         if (file_map(filename, &buf, &bufsize) != 0) {
 627                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 628                 return -1;
 629         }
 630         info("reading '%s' as rules file", filename);
 631
 632         /* loop through the whole file */
 633         cur = 0;
 634         lineno = 0;
 635         while (cur < bufsize) {
 636                 unsigned int i, j;
 637
 638                 count = buf_get_line(buf, bufsize, cur);
 639                 bufline = &buf[cur];
 640                 cur += count+1;
 641                 lineno++;
 642
 643                 /* eat the whitespace */
 644                 while ((count > 0) && isspace(bufline[0])) {
 645                         bufline++;
 646                         count--;
 647                 }
 648                 if (count == 0)
 649                         continue;
 650
 651                 /* see if this is a comment */
 652                 if (bufline[0] == COMMENT_CHARACTER)
 653                         continue;
 654
 655                 if (count >= sizeof(line)) {
 656                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 657                         continue;
 658                 }
 659
 660                 /* skip backslash and newline from multiline rules */
 661                 for (i = j = 0; i < count; i++) {
 662                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 663                                 continue;
 664
 665                         line[j++] = bufline[i];
 666                 }
 667                 line[j] = '\0';
 668
 669                 dbg("read '%s'", line);
 670                 add_to_rules(rules, line, filename, lineno);
 671         }
 672
 673         file_unmap(buf, bufsize);
 674         return retval;
 675 }
 676
 677 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 678 {
 679         struct stat stats;
 680         int retval;
 681
 682         memset(rules, 0x00, sizeof(struct udev_rules));
 683         rules->resolve_names = resolve_names;
 684
 685         /* parse rules file or all matching files in directory */
 686         if (stat(udev_rules_dir, &stats) != 0)
 687                 return -1;
 688
 689         if ((stats.st_mode & S_IFMT) != S_IFDIR) {
 690                 dbg("parse single rules file '%s'", udev_rules_dir);
 691                 retval = parse_file(rules, udev_rules_dir);
 692         } else {
 693                 struct name_entry *name_loop, *name_tmp;
 694                 LIST_HEAD(name_list);
 695
 696                 dbg("parse rules directory '%s'", udev_rules_dir);
 697                 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
 698
 699                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 700                         if (stat(name_loop->name, &stats) == 0) {
 701                                 if (stats.st_size)
 702                                         parse_file(rules, name_loop->name);
 703                                 else
 704                                         dbg("empty rules file '%s'", name_loop->name);
 705                         } else
 706                                 err("could not read '%s': %s", name_loop->name, strerror(errno));
 707                         list_del(&name_loop->node);
 708                         free(name_loop);
 709                 }
 710         }
 711
 712         return retval;
 713 }
 714
 715 void udev_rules_cleanup(struct udev_rules *rules)
 716 {
 717         if (rules->buf) {
 718                 free(rules->buf);
 719                 rules->buf = NULL;
 720         }
 721 }