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] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 108                         if (linepos[1] == '=')
 109                                 break;
 110         }
 111
 112         /* remember end of key */
 113         temp = linepos;
 114
 115         /* skip whitespace after key */
 116         while (isspace(linepos[0]))
 117                 linepos++;
 118         if (linepos[0] == '\0')
 119                 return -1;
 120
 121         /* get operation type */
 122         if (linepos[0] == '=' && linepos[1] == '=') {
 123                 *operation = KEY_OP_MATCH;
 124                 linepos += 2;
 125                 dbg("operator=match");
 126         } else if (linepos[0] == '!' && linepos[1] == '=') {
 127                 *operation = KEY_OP_NOMATCH;
 128                 linepos += 2;
 129                 dbg("operator=nomatch");
 130         } else if (linepos[0] == '+' && linepos[1] == '=') {
 131                 *operation = KEY_OP_ADD;
 132                 linepos += 2;
 133                 dbg("operator=add");
 134         } else if (linepos[0] == '=') {
 135                 *operation = KEY_OP_ASSIGN;
 136                 linepos++;
 137                 dbg("operator=assign");
 138         } else if (linepos[0] == ':' && linepos[1] == '=') {
 139                 *operation = KEY_OP_ASSIGN_FINAL;
 140                 linepos += 2;
 141                 dbg("operator=assign_final");
 142         } else
 143                 return -1;
 144
 145         /* terminate key */
 146         temp[0] = '\0';
 147         dbg("key='%s'", *key);
 148
 149         /* skip whitespace after operator */
 150         while (isspace(linepos[0]))
 151                 linepos++;
 152         if (linepos[0] == '\0')
 153                 return -1;
 154
 155         /* get the value*/
 156         if (linepos[0] == '"')
 157                 linepos++;
 158         else
 159                 return -1;
 160         *value = linepos;
 161
 162         temp = strchr(linepos, '"');
 163         if (!temp)
 164                 return -1;
 165         temp[0] = '\0';
 166         temp++;
 167         dbg("value='%s'", *value);
 168
 169         /* move line to next key */
 170         *line = temp;
 171
 172         return 0;
 173 }
 174
 175 /* extract possible KEY{attr} */
 176 static char *get_key_attribute(char *str)
 177 {
 178         char *pos;
 179         char *attr;
 180
 181         attr = strchr(str, '{');
 182         if (attr != NULL) {
 183                 attr++;
 184                 pos = strchr(attr, '}');
 185                 if (pos == NULL) {
 186                         err("missing closing brace for format");
 187                         return NULL;
 188                 }
 189                 pos[0] = '\0';
 190                 dbg("attribute='%s'", attr);
 191                 return attr;
 192         }
 193
 194         return NULL;
 195 }
 196
 197 static int add_rule_key(struct udev_rule *rule, struct key *key,
 198                         enum key_operation operation, const char *value)
 199 {
 200         size_t val_len = strnlen(value, PATH_SIZE);
 201
 202         key->operation = operation;
 203
 204         key->val_off = rule->bufsize;
 205         strlcpy(rule->buf + rule->bufsize, value, val_len+1);
 206         rule->bufsize += val_len+1;
 207
 208         return 0;
 209 }
 210
 211 static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
 212                              enum key_operation operation, const char *key, const char *value)
 213 {
 214         size_t key_len = strnlen(key, PATH_SIZE);
 215
 216         if (pairs->count >= PAIRS_MAX) {
 217                 err("skip, too many keys of the same type in a single rule");
 218                 return -1;
 219         }
 220
 221         add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
 222
 223         /* add the key-name of the pair */
 224         pairs->keys[pairs->count].key_name_off = rule->bufsize;
 225         strlcpy(rule->buf + rule->bufsize, key, key_len+1);
 226         rule->bufsize += key_len+1;
 227
 228         pairs->count++;
 229
 230         return 0;
 231 }
 232
 233 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
 234 {
 235         struct udev_rule *rule;
 236         size_t rule_size;
 237         int valid;
 238         char *linepos;
 239         char *attr;
 240         size_t padding;
 241         int physdev = 0;
 242         int retval;
 243
 244         /* get all the keys */
 245         rule = calloc(1, sizeof (struct udev_rule) + LINE_SIZE);
 246         if (!rule) {
 247                 err("malloc failed");
 248                 return -1;
 249         }
 250         linepos = line;
 251         valid = 0;
 252
 253         while (1) {
 254                 char *key;
 255                 char *value;
 256                 enum key_operation operation = KEY_OP_UNSET;
 257
 258                 retval = get_key(&linepos, &key, &operation, &value);
 259                 if (retval)
 260                         break;
 261
 262                 if (strcasecmp(key, "ACTION") == 0) {
 263                         if (operation != KEY_OP_MATCH &&
 264                             operation != KEY_OP_NOMATCH) {
 265                                 err("invalid ACTION operation");
 266                                 goto invalid;
 267                         }
 268                         add_rule_key(rule, &rule->action, operation, value);
 269                         valid = 1;
 270                         continue;
 271                 }
 272
 273                 if (strcasecmp(key, "DEVPATH") == 0) {
 274                         if (operation != KEY_OP_MATCH &&
 275                             operation != KEY_OP_NOMATCH) {
 276                                 err("invalid DEVPATH operation");
 277                                 goto invalid;
 278                         }
 279                         add_rule_key(rule, &rule->devpath, operation, value);
 280                         valid = 1;
 281                         continue;
 282                 }
 283
 284                 if (strcasecmp(key, "KERNEL") == 0) {
 285                         if (operation != KEY_OP_MATCH &&
 286                             operation != KEY_OP_NOMATCH) {
 287                                 err("invalid KERNEL operation");
 288                                 goto invalid;
 289                         }
 290                         add_rule_key(rule, &rule->kernel, operation, value);
 291                         valid = 1;
 292                         continue;
 293                 }
 294
 295                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 296                         if (operation != KEY_OP_MATCH &&
 297                             operation != KEY_OP_NOMATCH) {
 298                                 err("invalid SUBSYSTEM operation");
 299                                 goto invalid;
 300                         }
 301                         add_rule_key(rule, &rule->subsystem, operation, value);
 302                         valid = 1;
 303                         continue;
 304                 }
 305
 306                 if (strcasecmp(key, "DRIVER") == 0) {
 307                         if (operation != KEY_OP_MATCH &&
 308                             operation != KEY_OP_NOMATCH) {
 309                                 err("invalid DRIVER operation");
 310                                 goto invalid;
 311                         }
 312                         add_rule_key(rule, &rule->driver, operation, value);
 313                         valid = 1;
 314                         continue;
 315                 }
 316
 317                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 318                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 319                         if (attr == NULL) {
 320                                 err("error parsing ATTR attribute");
 321                                 goto invalid;
 322                         }
 323                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 324                                 goto invalid;
 325                         valid = 1;
 326                         continue;
 327                 }
 328
 329                 if (strcasecmp(key, "KERNELS") == 0 ||
 330                     strcasecmp(key, "ID") == 0) {
 331                         if (operation != KEY_OP_MATCH &&
 332                             operation != KEY_OP_NOMATCH) {
 333                                 err("invalid KERNELS operation");
 334                                 goto invalid;
 335                         }
 336                         add_rule_key(rule, &rule->kernels, operation, value);
 337                         valid = 1;
 338                         continue;
 339                 }
 340
 341                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 342                     strcasecmp(key, "BUS") == 0) {
 343                         if (operation != KEY_OP_MATCH &&
 344                             operation != KEY_OP_NOMATCH) {
 345                                 err("invalid SUBSYSTEMS operation");
 346                                 goto invalid;
 347                         }
 348                         add_rule_key(rule, &rule->subsystems, operation, value);
 349                         valid = 1;
 350                         continue;
 351                 }
 352
 353                 if (strcasecmp(key, "DRIVERS") == 0) {
 354                         if (operation != KEY_OP_MATCH &&
 355                             operation != KEY_OP_NOMATCH) {
 356                                 err("invalid DRIVERS operation");
 357                                 goto invalid;
 358                         }
 359                         add_rule_key(rule, &rule->drivers, operation, value);
 360                         valid = 1;
 361                         continue;
 362                 }
 363
 364                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 365                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 366                         if (operation != KEY_OP_MATCH &&
 367                             operation != KEY_OP_NOMATCH) {
 368                                 err("invalid ATTRS operation");
 369                                 goto invalid;
 370                         }
 371                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 372                         if (attr == NULL) {
 373                                 err("error parsing ATTRS attribute");
 374                                 goto invalid;
 375                         }
 376                         if (strncmp(attr, "device/", 7) == 0)
 377                                 err("the 'device' link is deprecated and will be removed from a future kernel, "
 378                                     "please fix it in %s:%u", filename, lineno);
 379                         else if (strchr(attr, '/') != NULL)
 380                                 err("do not reference parent sysfs directories directly, that may break with a future kernel, "
 381                                     "please fix it in %s:%u", filename, lineno);
 382                         if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 383                                 goto invalid;
 384                         valid = 1;
 385                         continue;
 386                 }
 387
 388                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 389                         attr = get_key_attribute(key + sizeof("ENV")-1);
 390                         if (attr == NULL) {
 391                                 err("error parsing ENV attribute");
 392                                 goto invalid;
 393                         }
 394                         if (strncmp(attr, "PHYSDEV", 7) == 0)
 395                                 physdev = 1;
 396                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 397                                 goto invalid;
 398                         valid = 1;
 399                         continue;
 400                 }
 401
 402                 if (strcasecmp(key, "PROGRAM") == 0) {
 403                         add_rule_key(rule, &rule->program, operation, value);
 404                         valid = 1;
 405                         continue;
 406                 }
 407
 408                 if (strcasecmp(key, "RESULT") == 0) {
 409                         if (operation != KEY_OP_MATCH &&
 410                             operation != KEY_OP_NOMATCH) {
 411                                 err("invalid RESULT operation");
 412                                 goto invalid;
 413                         }
 414                         add_rule_key(rule, &rule->result, operation, value);
 415                         valid = 1;
 416                         continue;
 417                 }
 418
 419                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 420                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 421                         if (attr && strstr(attr, "program")) {
 422                                 dbg("IMPORT will be executed");
 423                                 rule->import_type  = IMPORT_PROGRAM;
 424                         } else if (attr && strstr(attr, "file")) {
 425                                 dbg("IMPORT will be included as file");
 426                                 rule->import_type  = IMPORT_FILE;
 427                         } else if (attr && strstr(attr, "parent")) {
 428                                 dbg("IMPORT will include the parent values");
 429                                 rule->import_type = IMPORT_PARENT;
 430                         } else {
 431                                 /* figure it out if it is executable */
 432                                 char file[PATH_SIZE];
 433                                 char *pos;
 434                                 struct stat stats;
 435
 436                                 strlcpy(file, value, sizeof(file));
 437                                 pos = strchr(file, ' ');
 438                                 if (pos)
 439                                         pos[0] = '\0';
 440
 441                                 /* allow programs in /lib/udev called without the path */
 442                                 if (strchr(file, '/') == NULL) {
 443                                         strlcpy(file, "/lib/udev/", sizeof(file));
 444                                         strlcat(file, value, sizeof(file));
 445                                         pos = strchr(file, ' ');
 446                                         if (pos)
 447                                                 pos[0] = '\0';
 448                                 }
 449
 450                                 dbg("IMPORT auto mode for '%s'", file);
 451                                 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
 452                                         dbg("IMPORT is executable, will be executed (autotype)");
 453                                         rule->import_type  = IMPORT_PROGRAM;
 454                                 } else {
 455                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 456                                         rule->import_type  = IMPORT_FILE;
 457                                 }
 458                         }
 459                         add_rule_key(rule, &rule->import, operation, value);
 460                         valid = 1;
 461                         continue;
 462                 }
 463
 464                 if (strcasecmp(key, "RUN") == 0) {
 465                         add_rule_key(rule, &rule->run, operation, value);
 466                         valid = 1;
 467                         continue;
 468                 }
 469
 470                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 471                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 472                         valid = 1;
 473                         continue;
 474                 }
 475
 476                 if (strcasecmp(key, "LABEL") == 0) {
 477                         add_rule_key(rule, &rule->label, operation, value);
 478                         valid = 1;
 479                         continue;
 480                 }
 481
 482                 if (strcasecmp(key, "GOTO") == 0) {
 483                         add_rule_key(rule, &rule->goto_label, operation, value);
 484                         valid = 1;
 485                         continue;
 486                 }
 487
 488                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 489                         attr = get_key_attribute(key + sizeof("NAME")-1);
 490                         if (attr != NULL) {
 491                                 if (strstr(attr, "all_partitions") != NULL) {
 492                                         dbg("creation of partition nodes requested");
 493                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 494                                 }
 495                                 if (strstr(attr, "ignore_remove") != NULL) {
 496                                         dbg("remove event should be ignored");
 497                                         rule->ignore_remove = 1;
 498                                 }
 499                         }
 500                         if (value[0] == '\0')
 501                                 dbg("name empty, node creation supressed");
 502                         add_rule_key(rule, &rule->name, operation, value);
 503                         continue;
 504                 }
 505
 506                 if (strcasecmp(key, "SYMLINK") == 0) {
 507                         add_rule_key(rule, &rule->symlink, operation, value);
 508                         valid = 1;
 509                         continue;
 510                 }
 511
 512                 if (strcasecmp(key, "OWNER") == 0) {
 513                         valid = 1;
 514                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 515                                 char *endptr;
 516                                 strtoul(value, &endptr, 10);
 517                                 if (endptr[0] != '\0') {
 518                                         char owner[32];
 519                                         uid_t uid = lookup_user(value);
 520                                         dbg("replacing username='%s' by id=%i", value, uid);
 521                                         sprintf(owner, "%u", (unsigned int) uid);
 522                                         add_rule_key(rule, &rule->owner, operation, owner);
 523                                         continue;
 524                                 }
 525                         }
 526
 527                         add_rule_key(rule, &rule->owner, operation, value);
 528                         continue;
 529                 }
 530
 531                 if (strcasecmp(key, "GROUP") == 0) {
 532                         valid = 1;
 533                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 534                                 char *endptr;
 535                                 strtoul(value, &endptr, 10);
 536                                 if (endptr[0] != '\0') {
 537                                         char group[32];
 538                                         gid_t gid = lookup_group(value);
 539                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 540                                         sprintf(group, "%u", (unsigned int) gid);
 541                                         add_rule_key(rule, &rule->group, operation, group);
 542                                         continue;
 543                                 }
 544                         }
 545
 546                         add_rule_key(rule, &rule->group, operation, value);
 547                         continue;
 548                 }
 549
 550                 if (strcasecmp(key, "MODE") == 0) {
 551                         rule->mode = strtol(value, NULL, 8);
 552                         rule->mode_operation = operation;
 553                         valid = 1;
 554                         continue;
 555                 }
 556
 557                 if (strcasecmp(key, "OPTIONS") == 0) {
 558                         const char *pos;
 559
 560                         if (strstr(value, "last_rule") != NULL) {
 561                                 dbg("last rule to be applied");
 562                                 rule->last_rule = 1;
 563                         }
 564                         if (strstr(value, "ignore_device") != NULL) {
 565                                 dbg("device should be ignored");
 566                                 rule->ignore_device = 1;
 567                         }
 568                         if (strstr(value, "ignore_remove") != NULL) {
 569                                 dbg("remove event should be ignored");
 570                                 rule->ignore_remove = 1;
 571                         }
 572                         pos = strstr(value, "link_priority=");
 573                         if (pos != NULL) {
 574                                 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 575                                 info("link priority=%i", rule->link_priority);
 576                         }
 577                         if (strstr(value, "all_partitions") != NULL) {
 578                                 dbg("creation of partition nodes requested");
 579                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 580                         }
 581                         valid = 1;
 582                         continue;
 583                 }
 584
 585                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 586         }
 587
 588         if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
 589                 err("PHYSDEV* values are deprecated and will be removed from a future kernel, "
 590                     "please fix it in %s:%u", filename, lineno);
 591
 592         /* skip line if not any valid key was found */
 593         if (!valid)
 594                 goto invalid;
 595
 596         /* grow buffer and add rule */
 597         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 598         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 599         dbg("add %zi padding bytes", padding);
 600         rule_size += padding;
 601         rule->bufsize += padding;
 602
 603         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 604         if (!rules->buf) {
 605                 err("realloc failed");
 606                 goto exit;
 607         }
 608         dbg("adding rule to offset %zi", rules->bufsize);
 609         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 610         rules->bufsize += rule_size;
 611 exit:
 612         free(rule);
 613         return 0;
 614
 615 invalid:
 616         free(rule);
 617         err("invalid rule '%s:%u'", filename, lineno);
 618         return -1;
 619 }
 620
 621 static int parse_file(struct udev_rules *rules, const char *filename)
 622 {
 623         char line[LINE_SIZE];
 624         char *bufline;
 625         unsigned int lineno;
 626         char *buf;
 627         size_t bufsize;
 628         size_t cur;
 629         size_t count;
 630         int retval = 0;
 631
 632         if (file_map(filename, &buf, &bufsize) != 0) {
 633                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 634                 return -1;
 635         }
 636         info("reading '%s' as rules file", filename);
 637
 638         /* loop through the whole file */
 639         cur = 0;
 640         lineno = 0;
 641         while (cur < bufsize) {
 642                 unsigned int i, j;
 643
 644                 count = buf_get_line(buf, bufsize, cur);
 645                 bufline = &buf[cur];
 646                 cur += count+1;
 647                 lineno++;
 648
 649                 /* eat the whitespace */
 650                 while ((count > 0) && isspace(bufline[0])) {
 651                         bufline++;
 652                         count--;
 653                 }
 654                 if (count == 0)
 655                         continue;
 656
 657                 /* see if this is a comment */
 658                 if (bufline[0] == COMMENT_CHARACTER)
 659                         continue;
 660
 661                 if (count >= sizeof(line)) {
 662                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 663                         continue;
 664                 }
 665
 666                 /* skip backslash and newline from multiline rules */
 667                 for (i = j = 0; i < count; i++) {
 668                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 669                                 continue;
 670
 671                         line[j++] = bufline[i];
 672                 }
 673                 line[j] = '\0';
 674
 675                 dbg("read '%s'", line);
 676                 add_to_rules(rules, line, filename, lineno);
 677         }
 678
 679         file_unmap(buf, bufsize);
 680         return retval;
 681 }
 682
 683 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 684 {
 685         struct stat stats;
 686         int retval;
 687
 688         memset(rules, 0x00, sizeof(struct udev_rules));
 689         rules->resolve_names = resolve_names;
 690
 691         /* parse rules file or all matching files in directory */
 692         if (stat(udev_rules_dir, &stats) != 0)
 693                 return -1;
 694
 695         if ((stats.st_mode & S_IFMT) != S_IFDIR) {
 696                 dbg("parse single rules file '%s'", udev_rules_dir);
 697                 retval = parse_file(rules, udev_rules_dir);
 698         } else {
 699                 struct name_entry *name_loop, *name_tmp;
 700                 LIST_HEAD(name_list);
 701
 702                 dbg("parse rules directory '%s'", udev_rules_dir);
 703                 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
 704
 705                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 706                         if (stat(name_loop->name, &stats) == 0) {
 707                                 if (stats.st_size)
 708                                         parse_file(rules, name_loop->name);
 709                                 else
 710                                         dbg("empty rules file '%s'", name_loop->name);
 711                         } else
 712                                 err("could not read '%s': %s", name_loop->name, strerror(errno));
 713                         list_del(&name_loop->node);
 714                         free(name_loop);
 715                 }
 716         }
 717
 718         return retval;
 719 }
 720
 721 void udev_rules_cleanup(struct udev_rules *rules)
 722 {
 723         if (rules->buf) {
 724                 free(rules->buf);
 725                 rules->buf = NULL;
 726         }
 727 }