udev_rules_parse.c

   1 /*
   2  * udev_rules_parse.c
   3  *
   4  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
   5  * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <sys/stat.h>
  29 #include <errno.h>
  30
  31 #include "udev.h"
  32 #include "udev_rules.h"
  33
  34
  35 void udev_rules_iter_init(struct udev_rules *rules)
  36 {
  37         dbg("bufsize=%zi", rules->bufsize);
  38         rules->current = 0;
  39 }
  40
  41 struct udev_rule *udev_rules_iter_next(struct udev_rules *rules)
  42 {
  43         static struct udev_rule *rule;
  44
  45         if (!rules)
  46                 return NULL;
  47
  48         dbg("current=%zi", rules->current);
  49         if (rules->current >= rules->bufsize) {
  50                 dbg("no more rules");
  51                 return NULL;
  52         }
  53
  54         /* get next rule */
  55         rule = (struct udev_rule *) (rules->buf + rules->current);
  56         rules->current += sizeof(struct udev_rule) + rule->bufsize;
  57
  58         return rule;
  59 }
  60
  61 struct udev_rule *udev_rules_iter_label(struct udev_rules *rules, const char *label)
  62 {
  63         static struct udev_rule *rule;
  64
  65 next:
  66         dbg("current=%zi", rules->current);
  67         if (rules->current >= rules->bufsize) {
  68                 dbg("no more rules");
  69                 return NULL;
  70         }
  71         rule = (struct udev_rule *) (rules->buf + rules->current);
  72
  73         if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
  74                 dbg("moving forward, looking for label '%s'", label);
  75                 rules->current += sizeof(struct udev_rule) + rule->bufsize;
  76                 goto next;
  77         }
  78
  79         dbg("found label '%s'", label);
  80         return rule;
  81 }
  82
  83 static int get_key(char **line, char **key, enum key_operation *operation, char **value)
  84 {
  85         char *linepos;
  86         char *temp;
  87
  88         linepos = *line;
  89         if (linepos == NULL && linepos[0] == '\0')
  90                 return -1;
  91
  92         /* skip whitespace */
  93         while (isspace(linepos[0]) || linepos[0] == ',')
  94                 linepos++;
  95
  96         /* get the key */
  97         if (linepos[0] == '\0')
  98                 return -1;
  99         *key = linepos;
 100
 101         while (1) {
 102                 linepos++;
 103                 if (linepos[0] == '\0')
 104                         return -1;
 105                 if (isspace(linepos[0]))
 106                         break;
 107                 if (linepos[0] == '=')
 108                         break;
 109                 if (linepos[0] == '+')
 110                         break;
 111                 if (linepos[0] == '!')
 112                         break;
 113                 if (linepos[0] == ':')
 114                         break;
 115         }
 116
 117         /* remember end of key */
 118         temp = linepos;
 119
 120         /* skip whitespace after key */
 121         while (isspace(linepos[0]))
 122                 linepos++;
 123         if (linepos[0] == '\0')
 124                 return -1;
 125
 126         /* get operation type */
 127         if (linepos[0] == '=' && linepos[1] == '=') {
 128                 *operation = KEY_OP_MATCH;
 129                 linepos += 2;
 130                 dbg("operator=match");
 131         } else if (linepos[0] == '!' && linepos[1] == '=') {
 132                 *operation = KEY_OP_NOMATCH;
 133                 linepos += 2;
 134                 dbg("operator=nomatch");
 135         } else if (linepos[0] == '+' && linepos[1] == '=') {
 136                 *operation = KEY_OP_ADD;
 137                 linepos += 2;
 138                 dbg("operator=add");
 139         } else if (linepos[0] == '=') {
 140                 *operation = KEY_OP_ASSIGN;
 141                 linepos++;
 142                 dbg("operator=assign");
 143         } else if (linepos[0] == ':' && linepos[1] == '=') {
 144                 *operation = KEY_OP_ASSIGN_FINAL;
 145                 linepos += 2;
 146                 dbg("operator=assign_final");
 147         } else
 148                 return -1;
 149
 150         /* terminate key */
 151         temp[0] = '\0';
 152         dbg("key='%s'", *key);
 153
 154         /* skip whitespace after operator */
 155         while (isspace(linepos[0]))
 156                 linepos++;
 157         if (linepos[0] == '\0')
 158                 return -1;
 159
 160         /* get the value*/
 161         if (linepos[0] == '"')
 162                 linepos++;
 163         else
 164                 return -1;
 165         *value = linepos;
 166
 167         temp = strchr(linepos, '"');
 168         if (!temp)
 169                 return -1;
 170         temp[0] = '\0';
 171         temp++;
 172         dbg("value='%s'", *value);
 173
 174         /* move line to next key */
 175         *line = temp;
 176
 177         return 0;
 178 }
 179
 180 /* extract possible KEY{attr} */
 181 static char *get_key_attribute(char *str)
 182 {
 183         char *pos;
 184         char *attr;
 185
 186         attr = strchr(str, '{');
 187         if (attr != NULL) {
 188                 attr++;
 189                 pos = strchr(attr, '}');
 190                 if (pos == NULL) {
 191                         err("missing closing brace for format");
 192                         return NULL;
 193                 }
 194                 pos[0] = '\0';
 195                 dbg("attribute='%s'", attr);
 196                 return attr;
 197         }
 198
 199         return NULL;
 200 }
 201
 202 static int add_rule_key(struct udev_rule *rule, struct key *key,
 203                         enum key_operation operation, const char *value)
 204 {
 205         size_t val_len = strnlen(value, PATH_SIZE);
 206
 207         key->operation = operation;
 208
 209         key->val_off = rule->bufsize;
 210         strlcpy(rule->buf + rule->bufsize, value, val_len+1);
 211         rule->bufsize += val_len+1;
 212
 213         return 0;
 214 }
 215
 216 static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
 217                              enum key_operation operation, const char *key, const char *value)
 218 {
 219         size_t key_len = strnlen(key, PATH_SIZE);
 220
 221         if (pairs->count >= PAIRS_MAX) {
 222                 err("skip, too many keys in a single rule");
 223                 return -1;
 224         }
 225
 226         add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
 227
 228         /* add the key-name of the pair */
 229         pairs->keys[pairs->count].key_name_off = rule->bufsize;
 230         strlcpy(rule->buf + rule->bufsize, key, key_len+1);
 231         rule->bufsize += key_len+1;
 232
 233         pairs->count++;
 234
 235         return 0;
 236 }
 237
 238 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
 239 {
 240         struct udev_rule *rule;
 241         size_t rule_size;
 242         int valid;
 243         char *linepos;
 244         char *attr;
 245         size_t padding;
 246         int retval;
 247
 248         /* get all the keys */
 249         rule = calloc(1, sizeof (struct udev_rule) + LINE_SIZE);
 250         if (!rule) {
 251                 err("malloc failed");
 252                 return -1;
 253         }
 254         linepos = line;
 255         valid = 0;
 256
 257         while (1) {
 258                 char *key;
 259                 char *value;
 260                 enum key_operation operation = KEY_OP_UNSET;
 261
 262                 retval = get_key(&linepos, &key, &operation, &value);
 263                 if (retval)
 264                         break;
 265
 266                 if (strcasecmp(key, "ACTION") == 0) {
 267                         if (operation != KEY_OP_MATCH &&
 268                             operation != KEY_OP_NOMATCH) {
 269                                 err("invalid ACTION operation");
 270                                 goto invalid;
 271                         }
 272                         add_rule_key(rule, &rule->action, operation, value);
 273                         valid = 1;
 274                         continue;
 275                 }
 276
 277                 if (strcasecmp(key, "DEVPATH") == 0) {
 278                         if (operation != KEY_OP_MATCH &&
 279                             operation != KEY_OP_NOMATCH) {
 280                                 err("invalid DEVPATH operation");
 281                                 goto invalid;
 282                         }
 283                         add_rule_key(rule, &rule->devpath, operation, value);
 284                         valid = 1;
 285                         continue;
 286                 }
 287
 288                 if (strcasecmp(key, "KERNEL") == 0) {
 289                         if (operation != KEY_OP_MATCH &&
 290                             operation != KEY_OP_NOMATCH) {
 291                                 err("invalid KERNEL operation");
 292                                 goto invalid;
 293                         }
 294                         add_rule_key(rule, &rule->kernel, operation, value);
 295                         valid = 1;
 296                         continue;
 297                 }
 298
 299                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 300                         if (operation != KEY_OP_MATCH &&
 301                             operation != KEY_OP_NOMATCH) {
 302                                 err("invalid SUBSYSTEM operation");
 303                                 goto invalid;
 304                         }
 305                         add_rule_key(rule, &rule->subsystem, operation, value);
 306                         valid = 1;
 307                         continue;
 308                 }
 309
 310                 if (strcasecmp(key, "DRIVER") == 0) {
 311                         if (operation != KEY_OP_MATCH &&
 312                             operation != KEY_OP_NOMATCH) {
 313                                 err("invalid DRIVER operation");
 314                                 goto invalid;
 315                         }
 316                         err("DRIVER== will change in a future relase, "
 317                             "please use DRIVERS== in %s:%u", filename, lineno);
 318                         /* FIXME: this should be rule->driver to match only the event device */
 319                         add_rule_key(rule, &rule->drivers, operation, value);
 320                         valid = 1;
 321                         continue;
 322                 }
 323
 324                 if (strncasecmp(key, "ATTR", sizeof("ATTR")-1) == 0) {
 325                         if (operation != KEY_OP_MATCH &&
 326                             operation != KEY_OP_NOMATCH) {
 327                                 err("invalid ATTR operation");
 328                                 goto invalid;
 329                         }
 330                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 331                         if (attr == NULL) {
 332                                 err("error parsing ATTR attribute");
 333                                 goto invalid;
 334                         }
 335                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 336                                 goto invalid;
 337                         valid = 1;
 338                         continue;
 339                 }
 340
 341                 if (strcasecmp(key, "KERNELS") == 0 ||
 342                     strcasecmp(key, "ID") == 0) {
 343                         if (operation != KEY_OP_MATCH &&
 344                             operation != KEY_OP_NOMATCH) {
 345                                 err("invalid KERNELS operation");
 346                                 goto invalid;
 347                         }
 348                         add_rule_key(rule, &rule->kernels, operation, value);
 349                         valid = 1;
 350                         continue;
 351                 }
 352
 353                 if (strcasecmp(key, "SUBSYTEMS") == 0 ||
 354                     strcasecmp(key, "BUS") == 0) {
 355                         if (operation != KEY_OP_MATCH &&
 356                             operation != KEY_OP_NOMATCH) {
 357                                 err("invalid SUBSYSTEMS operation");
 358                                 goto invalid;
 359                         }
 360                         add_rule_key(rule, &rule->subsystems, operation, value);
 361                         valid = 1;
 362                         continue;
 363                 }
 364
 365                 if (strcasecmp(key, "DRIVERS") == 0) {
 366                         if (operation != KEY_OP_MATCH &&
 367                             operation != KEY_OP_NOMATCH) {
 368                                 err("invalid DRIVERS operation");
 369                                 goto invalid;
 370                         }
 371                         add_rule_key(rule, &rule->drivers, operation, value);
 372                         valid = 1;
 373                         continue;
 374                 }
 375
 376                 if (strncasecmp(key, "ATTRS", sizeof("ATTRS")-1) == 0 ||
 377                     strncasecmp(key, "SYSFS", sizeof("SYSFS")-1) == 0) {
 378                         if (operation != KEY_OP_MATCH &&
 379                             operation != KEY_OP_NOMATCH) {
 380                                 err("invalid ATTRSS operation");
 381                                 goto invalid;
 382                         }
 383                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 384                         if (attr == NULL) {
 385                                 err("error parsing ATTRS attribute");
 386                                 goto invalid;
 387                         }
 388                         if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 389                                 goto invalid;
 390                         valid = 1;
 391                         continue;
 392                 }
 393
 394                 if (strncasecmp(key, "ENV", sizeof("ENV")-1) == 0) {
 395                         attr = get_key_attribute(key + sizeof("ENV")-1);
 396                         if (attr == NULL) {
 397                                 err("error parsing ENV attribute");
 398                                 goto invalid;
 399                         }
 400                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 401                                 goto invalid;
 402                         valid = 1;
 403                         continue;
 404                 }
 405
 406                 if (strcasecmp(key, "PROGRAM") == 0) {
 407                         add_rule_key(rule, &rule->program, operation, value);
 408                         valid = 1;
 409                         continue;
 410                 }
 411
 412                 if (strcasecmp(key, "RESULT") == 0) {
 413                         if (operation != KEY_OP_MATCH &&
 414                             operation != KEY_OP_NOMATCH) {
 415                                 err("invalid RESULT operation");
 416                                 goto invalid;
 417                         }
 418                         add_rule_key(rule, &rule->result, operation, value);
 419                         valid = 1;
 420                         continue;
 421                 }
 422
 423                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 424                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 425                         if (attr && strstr(attr, "program")) {
 426                                 dbg("IMPORT will be executed");
 427                                 rule->import_type  = IMPORT_PROGRAM;
 428                         } else if (attr && strstr(attr, "file")) {
 429                                 dbg("IMPORT will be included as file");
 430                                 rule->import_type  = IMPORT_FILE;
 431                         } else if (attr && strstr(attr, "parent")) {
 432                                 dbg("IMPORT will include the parent values");
 433                                 rule->import_type = IMPORT_PARENT;
 434                         } else {
 435                                 /* figure it out if it is executable */
 436                                 char file[PATH_SIZE];
 437                                 char *pos;
 438                                 struct stat stats;
 439
 440                                 strlcpy(file, value, sizeof(file));
 441                                 pos = strchr(file, ' ');
 442                                 if (pos)
 443                                         pos[0] = '\0';
 444
 445                                 /* allow programs in /lib/udev called without the path */
 446                                 if (strchr(file, '/') == NULL) {
 447                                         strlcpy(file, "/lib/udev/", sizeof(file));
 448                                         strlcat(file, value, sizeof(file));
 449                                         pos = strchr(file, ' ');
 450                                         if (pos)
 451                                                 pos[0] = '\0';
 452                                 }
 453
 454                                 dbg("IMPORT auto mode for '%s'", file);
 455                                 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
 456                                         dbg("IMPORT is executable, will be executed (autotype)");
 457                                         rule->import_type  = IMPORT_PROGRAM;
 458                                 } else {
 459                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 460                                         rule->import_type  = IMPORT_FILE;
 461                                 }
 462                         }
 463                         add_rule_key(rule, &rule->import, operation, value);
 464                         valid = 1;
 465                         continue;
 466                 }
 467
 468                 if (strcasecmp(key, "RUN") == 0) {
 469                         add_rule_key(rule, &rule->run, operation, value);
 470                         valid = 1;
 471                         continue;
 472                 }
 473
 474                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 475                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 476                         valid = 1;
 477                         continue;
 478                 }
 479
 480                 if (strcasecmp(key, "LABEL") == 0) {
 481                         add_rule_key(rule, &rule->label, operation, value);
 482                         valid = 1;
 483                         continue;
 484                 }
 485
 486                 if (strcasecmp(key, "GOTO") == 0) {
 487                         add_rule_key(rule, &rule->goto_label, operation, value);
 488                         valid = 1;
 489                         continue;
 490                 }
 491
 492                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 493                         attr = get_key_attribute(key + sizeof("NAME")-1);
 494                         if (attr != NULL) {
 495                                 if (strstr(attr, "all_partitions") != NULL) {
 496                                         dbg("creation of partition nodes requested");
 497                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 498                                 }
 499                                 if (strstr(attr, "ignore_remove") != NULL) {
 500                                         dbg("remove event should be ignored");
 501                                         rule->ignore_remove = 1;
 502                                 }
 503                         }
 504                         if (value[0] == '\0')
 505                                 dbg("name empty, node creation supressed");
 506                         add_rule_key(rule, &rule->name, operation, value);
 507                         continue;
 508                 }
 509
 510                 if (strcasecmp(key, "SYMLINK") == 0) {
 511                         add_rule_key(rule, &rule->symlink, operation, value);
 512                         valid = 1;
 513                         continue;
 514                 }
 515
 516                 if (strcasecmp(key, "OWNER") == 0) {
 517                         valid = 1;
 518                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 519                                 char *endptr;
 520                                 strtoul(value, &endptr, 10);
 521                                 if (endptr[0] != '\0') {
 522                                         char owner[32];
 523                                         uid_t uid = lookup_user(value);
 524                                         dbg("replacing username='%s' by id=%i", value, uid);
 525                                         sprintf(owner, "%u", (unsigned int) uid);
 526                                         add_rule_key(rule, &rule->owner, operation, owner);
 527                                         continue;
 528                                 }
 529                         }
 530
 531                         add_rule_key(rule, &rule->owner, operation, value);
 532                         continue;
 533                 }
 534
 535                 if (strcasecmp(key, "GROUP") == 0) {
 536                         valid = 1;
 537                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 538                                 char *endptr;
 539                                 strtoul(value, &endptr, 10);
 540                                 if (endptr[0] != '\0') {
 541                                         char group[32];
 542                                         gid_t gid = lookup_group(value);
 543                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 544                                         sprintf(group, "%u", (unsigned int) gid);
 545                                         add_rule_key(rule, &rule->group, operation, group);
 546                                         continue;
 547                                 }
 548                         }
 549
 550                         add_rule_key(rule, &rule->group, operation, value);
 551                         continue;
 552                 }
 553
 554                 if (strcasecmp(key, "MODE") == 0) {
 555                         rule->mode = strtol(value, NULL, 8);
 556                         rule->mode_operation = operation;
 557                         valid = 1;
 558                         continue;
 559                 }
 560
 561                 if (strcasecmp(key, "OPTIONS") == 0) {
 562                         if (strstr(value, "last_rule") != NULL) {
 563                                 dbg("last rule to be applied");
 564                                 rule->last_rule = 1;
 565                         }
 566                         if (strstr(value, "ignore_device") != NULL) {
 567                                 dbg("device should be ignored");
 568                                 rule->ignore_device = 1;
 569                         }
 570                         if (strstr(value, "ignore_remove") != NULL) {
 571                                 dbg("remove event should be ignored");
 572                                 rule->ignore_remove = 1;
 573                         }
 574                         if (strstr(value, "all_partitions") != NULL) {
 575                                 dbg("creation of partition nodes requested");
 576                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 577                         }
 578                         valid = 1;
 579                         continue;
 580                 }
 581
 582                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 583         }
 584
 585         /* skip line if not any valid key was found */
 586         if (!valid)
 587                 goto invalid;
 588
 589         /* grow buffer and add rule */
 590         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 591         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 592         dbg("add %zi padding bytes", padding);
 593         rule_size += padding;
 594         rule->bufsize += padding;
 595
 596         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 597         if (!rules->buf) {
 598                 err("realloc failed");
 599                 goto exit;
 600         }
 601         dbg("adding rule to offset %zi", rules->bufsize);
 602         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 603         rules->bufsize += rule_size;
 604 exit:
 605         free(rule);
 606         return 0;
 607
 608 invalid:
 609         free(rule);
 610         err("invalid rule '%s:%u'", filename, lineno);
 611         return -1;
 612 }
 613
 614 static int parse_file(struct udev_rules *rules, const char *filename)
 615 {
 616         char line[LINE_SIZE];
 617         char *bufline;
 618         unsigned int lineno;
 619         char *buf;
 620         size_t bufsize;
 621         size_t cur;
 622         size_t count;
 623         int retval = 0;
 624
 625         if (file_map(filename, &buf, &bufsize) != 0) {
 626                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 627                 return -1;
 628         }
 629         dbg("reading '%s' as rules file", filename);
 630
 631         /* loop through the whole file */
 632         cur = 0;
 633         lineno = 0;
 634         while (cur < bufsize) {
 635                 unsigned int i, j;
 636
 637                 count = buf_get_line(buf, bufsize, cur);
 638                 bufline = &buf[cur];
 639                 cur += count+1;
 640                 lineno++;
 641
 642                 /* eat the whitespace */
 643                 while ((count > 0) && isspace(bufline[0])) {
 644                         bufline++;
 645                         count--;
 646                 }
 647                 if (count == 0)
 648                         continue;
 649
 650                 /* see if this is a comment */
 651                 if (bufline[0] == COMMENT_CHARACTER)
 652                         continue;
 653
 654                 if (count >= sizeof(line)) {
 655                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 656                         continue;
 657                 }
 658
 659                 /* skip backslash and newline from multiline rules */
 660                 for (i = j = 0; i < count; i++) {
 661                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 662                                 continue;
 663
 664                         line[j++] = bufline[i];
 665                 }
 666                 line[j] = '\0';
 667
 668                 dbg("read '%s'", line);
 669                 add_to_rules(rules, line, filename, lineno);
 670         }
 671
 672         file_unmap(buf, bufsize);
 673         return retval;
 674 }
 675
 676 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 677 {
 678         struct stat stats;
 679         int retval;
 680
 681         memset(rules, 0x00, sizeof(struct udev_rules));
 682         rules->resolve_names = resolve_names;
 683
 684         /* parse rules file or all matching files in directory */
 685         if (stat(udev_rules_filename, &stats) != 0)
 686                 return -1;
 687
 688         if ((stats.st_mode & S_IFMT) != S_IFDIR) {
 689                 dbg("parse single rules file '%s'", udev_rules_filename);
 690                 retval = parse_file(rules, udev_rules_filename);
 691         } else {
 692                 struct name_entry *name_loop, *name_tmp;
 693                 LIST_HEAD(name_list);
 694
 695                 dbg("parse rules directory '%s'", udev_rules_filename);
 696                 retval = add_matching_files(&name_list, udev_rules_filename, RULEFILE_SUFFIX);
 697
 698                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 699                         if (stat(name_loop->name, &stats) == 0) {
 700                                 if (stats.st_size)
 701                                         parse_file(rules, name_loop->name);
 702                                 else
 703                                         dbg("empty rules file '%s'", name_loop->name);
 704                         } else
 705                                 err("could not read '%s': %s", name_loop->name, strerror(errno));
 706                         list_del(&name_loop->node);
 707                         free(name_loop);
 708                 }
 709         }
 710
 711         return retval;
 712 }
 713
 714 void udev_rules_cleanup(struct udev_rules *rules)
 715 {
 716         if (rules->buf) {
 717                 free(rules->buf);
 718                 rules->buf = NULL;
 719         }
 720 }