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 retval;
 245
 246         /* get all the keys */
 247         rule = calloc(1, sizeof (struct udev_rule) + LINE_SIZE);
 248         if (!rule) {
 249                 err("malloc failed");
 250                 return -1;
 251         }
 252         linepos = line;
 253         valid = 0;
 254
 255         while (1) {
 256                 char *key;
 257                 char *value;
 258                 enum key_operation operation = KEY_OP_UNSET;
 259
 260                 retval = get_key(&linepos, &key, &operation, &value);
 261                 if (retval)
 262                         break;
 263
 264                 if (strcasecmp(key, "ACTION") == 0) {
 265                         if (operation != KEY_OP_MATCH &&
 266                             operation != KEY_OP_NOMATCH) {
 267                                 err("invalid ACTION operation");
 268                                 goto invalid;
 269                         }
 270                         add_rule_key(rule, &rule->action, operation, value);
 271                         valid = 1;
 272                         continue;
 273                 }
 274
 275                 if (strcasecmp(key, "DEVPATH") == 0) {
 276                         if (operation != KEY_OP_MATCH &&
 277                             operation != KEY_OP_NOMATCH) {
 278                                 err("invalid DEVPATH operation");
 279                                 goto invalid;
 280                         }
 281                         add_rule_key(rule, &rule->devpath, operation, value);
 282                         valid = 1;
 283                         continue;
 284                 }
 285
 286                 if (strcasecmp(key, "KERNEL") == 0) {
 287                         if (operation != KEY_OP_MATCH &&
 288                             operation != KEY_OP_NOMATCH) {
 289                                 err("invalid KERNEL operation");
 290                                 goto invalid;
 291                         }
 292                         add_rule_key(rule, &rule->kernel, operation, value);
 293                         valid = 1;
 294                         continue;
 295                 }
 296
 297                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 298                         if (operation != KEY_OP_MATCH &&
 299                             operation != KEY_OP_NOMATCH) {
 300                                 err("invalid SUBSYSTEM operation");
 301                                 goto invalid;
 302                         }
 303                         add_rule_key(rule, &rule->subsystem, operation, value);
 304                         valid = 1;
 305                         continue;
 306                 }
 307
 308                 if (strcasecmp(key, "DRIVER") == 0) {
 309                         if (operation != KEY_OP_MATCH &&
 310                             operation != KEY_OP_NOMATCH) {
 311                                 err("invalid DRIVER operation");
 312                                 goto invalid;
 313                         }
 314                         err("DRIVER== will change in a future relase, "
 315                             "please use DRIVERS== in %s:%u", filename, lineno);
 316                         /* FIXME: this should be rule->driver to match only the event device */
 317                         add_rule_key(rule, &rule->drivers, operation, value);
 318                         valid = 1;
 319                         continue;
 320                 }
 321
 322                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 323                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 324                         if (attr == NULL) {
 325                                 err("error parsing ATTR attribute");
 326                                 goto invalid;
 327                         }
 328                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 329                                 goto invalid;
 330                         valid = 1;
 331                         continue;
 332                 }
 333
 334                 if (strcasecmp(key, "KERNELS") == 0 ||
 335                     strcasecmp(key, "ID") == 0) {
 336                         if (operation != KEY_OP_MATCH &&
 337                             operation != KEY_OP_NOMATCH) {
 338                                 err("invalid KERNELS operation");
 339                                 goto invalid;
 340                         }
 341                         add_rule_key(rule, &rule->kernels, operation, value);
 342                         valid = 1;
 343                         continue;
 344                 }
 345
 346                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 347                     strcasecmp(key, "BUS") == 0) {
 348                         if (operation != KEY_OP_MATCH &&
 349                             operation != KEY_OP_NOMATCH) {
 350                                 err("invalid SUBSYSTEMS operation");
 351                                 goto invalid;
 352                         }
 353                         add_rule_key(rule, &rule->subsystems, operation, value);
 354                         valid = 1;
 355                         continue;
 356                 }
 357
 358                 if (strcasecmp(key, "DRIVERS") == 0) {
 359                         if (operation != KEY_OP_MATCH &&
 360                             operation != KEY_OP_NOMATCH) {
 361                                 err("invalid DRIVERS operation");
 362                                 goto invalid;
 363                         }
 364                         add_rule_key(rule, &rule->drivers, operation, value);
 365                         valid = 1;
 366                         continue;
 367                 }
 368
 369                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 370                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 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 (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 377                                 goto invalid;
 378                         valid = 1;
 379                         continue;
 380                 }
 381
 382                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 383                         attr = get_key_attribute(key + sizeof("ENV")-1);
 384                         if (attr == NULL) {
 385                                 err("error parsing ENV attribute");
 386                                 goto invalid;
 387                         }
 388                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 389                                 goto invalid;
 390                         valid = 1;
 391                         continue;
 392                 }
 393
 394                 if (strcasecmp(key, "PROGRAM") == 0) {
 395                         add_rule_key(rule, &rule->program, operation, value);
 396                         valid = 1;
 397                         continue;
 398                 }
 399
 400                 if (strcasecmp(key, "RESULT") == 0) {
 401                         if (operation != KEY_OP_MATCH &&
 402                             operation != KEY_OP_NOMATCH) {
 403                                 err("invalid RESULT operation");
 404                                 goto invalid;
 405                         }
 406                         add_rule_key(rule, &rule->result, operation, value);
 407                         valid = 1;
 408                         continue;
 409                 }
 410
 411                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 412                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 413                         if (attr && strstr(attr, "program")) {
 414                                 dbg("IMPORT will be executed");
 415                                 rule->import_type  = IMPORT_PROGRAM;
 416                         } else if (attr && strstr(attr, "file")) {
 417                                 dbg("IMPORT will be included as file");
 418                                 rule->import_type  = IMPORT_FILE;
 419                         } else if (attr && strstr(attr, "parent")) {
 420                                 dbg("IMPORT will include the parent values");
 421                                 rule->import_type = IMPORT_PARENT;
 422                         } else {
 423                                 /* figure it out if it is executable */
 424                                 char file[PATH_SIZE];
 425                                 char *pos;
 426                                 struct stat stats;
 427
 428                                 strlcpy(file, value, sizeof(file));
 429                                 pos = strchr(file, ' ');
 430                                 if (pos)
 431                                         pos[0] = '\0';
 432
 433                                 /* allow programs in /lib/udev called without the path */
 434                                 if (strchr(file, '/') == NULL) {
 435                                         strlcpy(file, "/lib/udev/", sizeof(file));
 436                                         strlcat(file, value, sizeof(file));
 437                                         pos = strchr(file, ' ');
 438                                         if (pos)
 439                                                 pos[0] = '\0';
 440                                 }
 441
 442                                 dbg("IMPORT auto mode for '%s'", file);
 443                                 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
 444                                         dbg("IMPORT is executable, will be executed (autotype)");
 445                                         rule->import_type  = IMPORT_PROGRAM;
 446                                 } else {
 447                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 448                                         rule->import_type  = IMPORT_FILE;
 449                                 }
 450                         }
 451                         add_rule_key(rule, &rule->import, operation, value);
 452                         valid = 1;
 453                         continue;
 454                 }
 455
 456                 if (strcasecmp(key, "RUN") == 0) {
 457                         add_rule_key(rule, &rule->run, operation, value);
 458                         valid = 1;
 459                         continue;
 460                 }
 461
 462                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 463                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 464                         valid = 1;
 465                         continue;
 466                 }
 467
 468                 if (strcasecmp(key, "LABEL") == 0) {
 469                         add_rule_key(rule, &rule->label, operation, value);
 470                         valid = 1;
 471                         continue;
 472                 }
 473
 474                 if (strcasecmp(key, "GOTO") == 0) {
 475                         add_rule_key(rule, &rule->goto_label, operation, value);
 476                         valid = 1;
 477                         continue;
 478                 }
 479
 480                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 481                         attr = get_key_attribute(key + sizeof("NAME")-1);
 482                         if (attr != NULL) {
 483                                 if (strstr(attr, "all_partitions") != NULL) {
 484                                         dbg("creation of partition nodes requested");
 485                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 486                                 }
 487                                 if (strstr(attr, "ignore_remove") != NULL) {
 488                                         dbg("remove event should be ignored");
 489                                         rule->ignore_remove = 1;
 490                                 }
 491                         }
 492                         if (value[0] == '\0')
 493                                 dbg("name empty, node creation supressed");
 494                         add_rule_key(rule, &rule->name, operation, value);
 495                         continue;
 496                 }
 497
 498                 if (strcasecmp(key, "SYMLINK") == 0) {
 499                         add_rule_key(rule, &rule->symlink, operation, value);
 500                         valid = 1;
 501                         continue;
 502                 }
 503
 504                 if (strcasecmp(key, "OWNER") == 0) {
 505                         valid = 1;
 506                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 507                                 char *endptr;
 508                                 strtoul(value, &endptr, 10);
 509                                 if (endptr[0] != '\0') {
 510                                         char owner[32];
 511                                         uid_t uid = lookup_user(value);
 512                                         dbg("replacing username='%s' by id=%i", value, uid);
 513                                         sprintf(owner, "%u", (unsigned int) uid);
 514                                         add_rule_key(rule, &rule->owner, operation, owner);
 515                                         continue;
 516                                 }
 517                         }
 518
 519                         add_rule_key(rule, &rule->owner, operation, value);
 520                         continue;
 521                 }
 522
 523                 if (strcasecmp(key, "GROUP") == 0) {
 524                         valid = 1;
 525                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 526                                 char *endptr;
 527                                 strtoul(value, &endptr, 10);
 528                                 if (endptr[0] != '\0') {
 529                                         char group[32];
 530                                         gid_t gid = lookup_group(value);
 531                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 532                                         sprintf(group, "%u", (unsigned int) gid);
 533                                         add_rule_key(rule, &rule->group, operation, group);
 534                                         continue;
 535                                 }
 536                         }
 537
 538                         add_rule_key(rule, &rule->group, operation, value);
 539                         continue;
 540                 }
 541
 542                 if (strcasecmp(key, "MODE") == 0) {
 543                         rule->mode = strtol(value, NULL, 8);
 544                         rule->mode_operation = operation;
 545                         valid = 1;
 546                         continue;
 547                 }
 548
 549                 if (strcasecmp(key, "OPTIONS") == 0) {
 550                         if (strstr(value, "last_rule") != NULL) {
 551                                 dbg("last rule to be applied");
 552                                 rule->last_rule = 1;
 553                         }
 554                         if (strstr(value, "ignore_device") != NULL) {
 555                                 dbg("device should be ignored");
 556                                 rule->ignore_device = 1;
 557                         }
 558                         if (strstr(value, "ignore_remove") != NULL) {
 559                                 dbg("remove event should be ignored");
 560                                 rule->ignore_remove = 1;
 561                         }
 562                         if (strstr(value, "all_partitions") != NULL) {
 563                                 dbg("creation of partition nodes requested");
 564                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 565                         }
 566                         valid = 1;
 567                         continue;
 568                 }
 569
 570                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 571         }
 572
 573         /* skip line if not any valid key was found */
 574         if (!valid)
 575                 goto invalid;
 576
 577         /* grow buffer and add rule */
 578         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 579         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 580         dbg("add %zi padding bytes", padding);
 581         rule_size += padding;
 582         rule->bufsize += padding;
 583
 584         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 585         if (!rules->buf) {
 586                 err("realloc failed");
 587                 goto exit;
 588         }
 589         dbg("adding rule to offset %zi", rules->bufsize);
 590         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 591         rules->bufsize += rule_size;
 592 exit:
 593         free(rule);
 594         return 0;
 595
 596 invalid:
 597         free(rule);
 598         err("invalid rule '%s:%u'", filename, lineno);
 599         return -1;
 600 }
 601
 602 static int parse_file(struct udev_rules *rules, const char *filename)
 603 {
 604         char line[LINE_SIZE];
 605         char *bufline;
 606         unsigned int lineno;
 607         char *buf;
 608         size_t bufsize;
 609         size_t cur;
 610         size_t count;
 611         int retval = 0;
 612
 613         if (file_map(filename, &buf, &bufsize) != 0) {
 614                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 615                 return -1;
 616         }
 617         dbg("reading '%s' as rules file", filename);
 618
 619         /* loop through the whole file */
 620         cur = 0;
 621         lineno = 0;
 622         while (cur < bufsize) {
 623                 unsigned int i, j;
 624
 625                 count = buf_get_line(buf, bufsize, cur);
 626                 bufline = &buf[cur];
 627                 cur += count+1;
 628                 lineno++;
 629
 630                 /* eat the whitespace */
 631                 while ((count > 0) && isspace(bufline[0])) {
 632                         bufline++;
 633                         count--;
 634                 }
 635                 if (count == 0)
 636                         continue;
 637
 638                 /* see if this is a comment */
 639                 if (bufline[0] == COMMENT_CHARACTER)
 640                         continue;
 641
 642                 if (count >= sizeof(line)) {
 643                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 644                         continue;
 645                 }
 646
 647                 /* skip backslash and newline from multiline rules */
 648                 for (i = j = 0; i < count; i++) {
 649                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 650                                 continue;
 651
 652                         line[j++] = bufline[i];
 653                 }
 654                 line[j] = '\0';
 655
 656                 dbg("read '%s'", line);
 657                 add_to_rules(rules, line, filename, lineno);
 658         }
 659
 660         file_unmap(buf, bufsize);
 661         return retval;
 662 }
 663
 664 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 665 {
 666         struct stat stats;
 667         int retval;
 668
 669         memset(rules, 0x00, sizeof(struct udev_rules));
 670         rules->resolve_names = resolve_names;
 671
 672         /* parse rules file or all matching files in directory */
 673         if (stat(udev_rules_filename, &stats) != 0)
 674                 return -1;
 675
 676         if ((stats.st_mode & S_IFMT) != S_IFDIR) {
 677                 dbg("parse single rules file '%s'", udev_rules_filename);
 678                 retval = parse_file(rules, udev_rules_filename);
 679         } else {
 680                 struct name_entry *name_loop, *name_tmp;
 681                 LIST_HEAD(name_list);
 682
 683                 dbg("parse rules directory '%s'", udev_rules_filename);
 684                 retval = add_matching_files(&name_list, udev_rules_filename, RULEFILE_SUFFIX);
 685
 686                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 687                         if (stat(name_loop->name, &stats) == 0) {
 688                                 if (stats.st_size)
 689                                         parse_file(rules, name_loop->name);
 690                                 else
 691                                         dbg("empty rules file '%s'", name_loop->name);
 692                         } else
 693                                 err("could not read '%s': %s", name_loop->name, strerror(errno));
 694                         list_del(&name_loop->node);
 695                         free(name_loop);
 696                 }
 697         }
 698
 699         return retval;
 700 }
 701
 702 void udev_rules_cleanup(struct udev_rules *rules)
 703 {
 704         if (rules->buf) {
 705                 free(rules->buf);
 706                 rules->buf = NULL;
 707         }
 708 }