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                         /* bus, class, subsystem events should all be the same */
 302                         if (strcmp(value, "subsystem") == 0 ||
 303                             strcmp(value, "bus") == 0 ||
 304                             strcmp(value, "class") == 0) {
 305                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
 306                                         err("'%s' must be specified as 'subsystem' "
 307                                             "please fix it in %s:%u", value, filename, lineno);
 308                                 add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
 309                         } else
 310                                 add_rule_key(rule, &rule->subsystem, operation, value);
 311                         valid = 1;
 312                         continue;
 313                 }
 314
 315                 if (strcasecmp(key, "DRIVER") == 0) {
 316                         if (operation != KEY_OP_MATCH &&
 317                             operation != KEY_OP_NOMATCH) {
 318                                 err("invalid DRIVER operation");
 319                                 goto invalid;
 320                         }
 321                         add_rule_key(rule, &rule->driver, operation, value);
 322                         valid = 1;
 323                         continue;
 324                 }
 325
 326                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 327                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 328                         if (attr == NULL) {
 329                                 err("error parsing ATTR attribute");
 330                                 goto invalid;
 331                         }
 332                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 333                                 goto invalid;
 334                         valid = 1;
 335                         continue;
 336                 }
 337
 338                 if (strcasecmp(key, "KERNELS") == 0 ||
 339                     strcasecmp(key, "ID") == 0) {
 340                         if (operation != KEY_OP_MATCH &&
 341                             operation != KEY_OP_NOMATCH) {
 342                                 err("invalid KERNELS operation");
 343                                 goto invalid;
 344                         }
 345                         add_rule_key(rule, &rule->kernels, operation, value);
 346                         valid = 1;
 347                         continue;
 348                 }
 349
 350                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 351                     strcasecmp(key, "BUS") == 0) {
 352                         if (operation != KEY_OP_MATCH &&
 353                             operation != KEY_OP_NOMATCH) {
 354                                 err("invalid SUBSYSTEMS operation");
 355                                 goto invalid;
 356                         }
 357                         add_rule_key(rule, &rule->subsystems, operation, value);
 358                         valid = 1;
 359                         continue;
 360                 }
 361
 362                 if (strcasecmp(key, "DRIVERS") == 0) {
 363                         if (operation != KEY_OP_MATCH &&
 364                             operation != KEY_OP_NOMATCH) {
 365                                 err("invalid DRIVERS operation");
 366                                 goto invalid;
 367                         }
 368                         add_rule_key(rule, &rule->drivers, operation, value);
 369                         valid = 1;
 370                         continue;
 371                 }
 372
 373                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 374                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 375                         if (operation != KEY_OP_MATCH &&
 376                             operation != KEY_OP_NOMATCH) {
 377                                 err("invalid ATTRS operation");
 378                                 goto invalid;
 379                         }
 380                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 381                         if (attr == NULL) {
 382                                 err("error parsing ATTRS attribute");
 383                                 goto invalid;
 384                         }
 385                         if (strncmp(attr, "device/", 7) == 0)
 386                                 err("the 'device' link is deprecated and will be removed from a future kernel, "
 387                                     "please fix it in %s:%u", filename, lineno);
 388                         else if (strstr(attr, "../") != NULL)
 389                                 err("do not reference parent sysfs directories directly, that may break with a future kernel, "
 390                                     "please fix it in %s:%u", filename, lineno);
 391                         if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 392                                 goto invalid;
 393                         valid = 1;
 394                         continue;
 395                 }
 396
 397                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 398                         attr = get_key_attribute(key + sizeof("ENV")-1);
 399                         if (attr == NULL) {
 400                                 err("error parsing ENV attribute");
 401                                 goto invalid;
 402                         }
 403                         if (strncmp(attr, "PHYSDEV", 7) == 0)
 404                                 physdev = 1;
 405                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 406                                 goto invalid;
 407                         valid = 1;
 408                         continue;
 409                 }
 410
 411                 if (strcasecmp(key, "PROGRAM") == 0) {
 412                         add_rule_key(rule, &rule->program, operation, value);
 413                         valid = 1;
 414                         continue;
 415                 }
 416
 417                 if (strcasecmp(key, "RESULT") == 0) {
 418                         if (operation != KEY_OP_MATCH &&
 419                             operation != KEY_OP_NOMATCH) {
 420                                 err("invalid RESULT operation");
 421                                 goto invalid;
 422                         }
 423                         add_rule_key(rule, &rule->result, operation, value);
 424                         valid = 1;
 425                         continue;
 426                 }
 427
 428                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 429                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 430                         if (attr && strstr(attr, "program")) {
 431                                 dbg("IMPORT will be executed");
 432                                 rule->import_type  = IMPORT_PROGRAM;
 433                         } else if (attr && strstr(attr, "file")) {
 434                                 dbg("IMPORT will be included as file");
 435                                 rule->import_type  = IMPORT_FILE;
 436                         } else if (attr && strstr(attr, "parent")) {
 437                                 dbg("IMPORT will include the parent values");
 438                                 rule->import_type = IMPORT_PARENT;
 439                         } else {
 440                                 /* figure it out if it is executable */
 441                                 char file[PATH_SIZE];
 442                                 char *pos;
 443                                 struct stat stats;
 444
 445                                 strlcpy(file, value, sizeof(file));
 446                                 pos = strchr(file, ' ');
 447                                 if (pos)
 448                                         pos[0] = '\0';
 449
 450                                 /* allow programs in /lib/udev called without the path */
 451                                 if (strchr(file, '/') == NULL) {
 452                                         strlcpy(file, "/lib/udev/", sizeof(file));
 453                                         strlcat(file, value, sizeof(file));
 454                                         pos = strchr(file, ' ');
 455                                         if (pos)
 456                                                 pos[0] = '\0';
 457                                 }
 458
 459                                 dbg("IMPORT auto mode for '%s'", file);
 460                                 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
 461                                         dbg("IMPORT is executable, will be executed (autotype)");
 462                                         rule->import_type  = IMPORT_PROGRAM;
 463                                 } else {
 464                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 465                                         rule->import_type  = IMPORT_FILE;
 466                                 }
 467                         }
 468                         add_rule_key(rule, &rule->import, operation, value);
 469                         valid = 1;
 470                         continue;
 471                 }
 472
 473                 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
 474                         attr = get_key_attribute(key + sizeof("TEST")-1);
 475                         if (attr != NULL)
 476                                 rule->test_mode_mask = strtol(attr, NULL, 8);
 477                         add_rule_key(rule, &rule->test, operation, value);
 478                         valid = 1;
 479                         continue;
 480                 }
 481
 482                 if (strcasecmp(key, "RUN") == 0) {
 483                         add_rule_key(rule, &rule->run, operation, value);
 484                         valid = 1;
 485                         continue;
 486                 }
 487
 488                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 489                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 490                         valid = 1;
 491                         continue;
 492                 }
 493
 494                 if (strcasecmp(key, "LABEL") == 0) {
 495                         add_rule_key(rule, &rule->label, operation, value);
 496                         valid = 1;
 497                         continue;
 498                 }
 499
 500                 if (strcasecmp(key, "GOTO") == 0) {
 501                         add_rule_key(rule, &rule->goto_label, operation, value);
 502                         valid = 1;
 503                         continue;
 504                 }
 505
 506                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 507                         attr = get_key_attribute(key + sizeof("NAME")-1);
 508                         if (attr != NULL) {
 509                                 if (strstr(attr, "all_partitions") != NULL) {
 510                                         dbg("creation of partition nodes requested");
 511                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 512                                 }
 513                                 if (strstr(attr, "ignore_remove") != NULL) {
 514                                         dbg("remove event should be ignored");
 515                                         rule->ignore_remove = 1;
 516                                 }
 517                         }
 518                         if (value[0] == '\0')
 519                                 dbg("name empty, node creation supressed");
 520                         add_rule_key(rule, &rule->name, operation, value);
 521                         continue;
 522                 }
 523
 524                 if (strcasecmp(key, "SYMLINK") == 0) {
 525                         add_rule_key(rule, &rule->symlink, operation, value);
 526                         valid = 1;
 527                         continue;
 528                 }
 529
 530                 if (strcasecmp(key, "OWNER") == 0) {
 531                         valid = 1;
 532                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 533                                 char *endptr;
 534                                 strtoul(value, &endptr, 10);
 535                                 if (endptr[0] != '\0') {
 536                                         char owner[32];
 537                                         uid_t uid = lookup_user(value);
 538                                         dbg("replacing username='%s' by id=%i", value, uid);
 539                                         sprintf(owner, "%u", (unsigned int) uid);
 540                                         add_rule_key(rule, &rule->owner, operation, owner);
 541                                         continue;
 542                                 }
 543                         }
 544
 545                         add_rule_key(rule, &rule->owner, operation, value);
 546                         continue;
 547                 }
 548
 549                 if (strcasecmp(key, "GROUP") == 0) {
 550                         valid = 1;
 551                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 552                                 char *endptr;
 553                                 strtoul(value, &endptr, 10);
 554                                 if (endptr[0] != '\0') {
 555                                         char group[32];
 556                                         gid_t gid = lookup_group(value);
 557                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 558                                         sprintf(group, "%u", (unsigned int) gid);
 559                                         add_rule_key(rule, &rule->group, operation, group);
 560                                         continue;
 561                                 }
 562                         }
 563
 564                         add_rule_key(rule, &rule->group, operation, value);
 565                         continue;
 566                 }
 567
 568                 if (strcasecmp(key, "MODE") == 0) {
 569                         rule->mode = strtol(value, NULL, 8);
 570                         rule->mode_operation = operation;
 571                         valid = 1;
 572                         continue;
 573                 }
 574
 575                 if (strcasecmp(key, "OPTIONS") == 0) {
 576                         const char *pos;
 577
 578                         if (strstr(value, "last_rule") != NULL) {
 579                                 dbg("last rule to be applied");
 580                                 rule->last_rule = 1;
 581                         }
 582                         if (strstr(value, "ignore_device") != NULL) {
 583                                 dbg("device should be ignored");
 584                                 rule->ignore_device = 1;
 585                         }
 586                         if (strstr(value, "ignore_remove") != NULL) {
 587                                 dbg("remove event should be ignored");
 588                                 rule->ignore_remove = 1;
 589                         }
 590                         pos = strstr(value, "link_priority=");
 591                         if (pos != NULL) {
 592                                 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 593                                 info("link priority=%i", rule->link_priority);
 594                         }
 595                         if (strstr(value, "all_partitions") != NULL) {
 596                                 dbg("creation of partition nodes requested");
 597                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 598                         }
 599                         valid = 1;
 600                         continue;
 601                 }
 602
 603                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 604         }
 605
 606         if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
 607                 err("PHYSDEV* values are deprecated and will be removed from a future kernel, "
 608                     "please fix it in %s:%u", filename, lineno);
 609
 610         /* skip line if not any valid key was found */
 611         if (!valid)
 612                 goto invalid;
 613
 614         /* grow buffer and add rule */
 615         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 616         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 617         dbg("add %zi padding bytes", padding);
 618         rule_size += padding;
 619         rule->bufsize += padding;
 620
 621         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 622         if (!rules->buf) {
 623                 err("realloc failed");
 624                 goto exit;
 625         }
 626         dbg("adding rule to offset %zi", rules->bufsize);
 627         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 628         rules->bufsize += rule_size;
 629 exit:
 630         free(rule);
 631         return 0;
 632
 633 invalid:
 634         free(rule);
 635         err("invalid rule '%s:%u'", filename, lineno);
 636         return -1;
 637 }
 638
 639 static int parse_file(struct udev_rules *rules, const char *filename)
 640 {
 641         char line[LINE_SIZE];
 642         char *bufline;
 643         unsigned int lineno;
 644         char *buf;
 645         size_t bufsize;
 646         size_t cur;
 647         size_t count;
 648         int retval = 0;
 649
 650         if (file_map(filename, &buf, &bufsize) != 0) {
 651                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 652                 return -1;
 653         }
 654         info("reading '%s' as rules file", filename);
 655
 656         /* loop through the whole file */
 657         cur = 0;
 658         lineno = 0;
 659         while (cur < bufsize) {
 660                 unsigned int i, j;
 661
 662                 count = buf_get_line(buf, bufsize, cur);
 663                 bufline = &buf[cur];
 664                 cur += count+1;
 665                 lineno++;
 666
 667                 /* eat the whitespace */
 668                 while ((count > 0) && isspace(bufline[0])) {
 669                         bufline++;
 670                         count--;
 671                 }
 672                 if (count == 0)
 673                         continue;
 674
 675                 /* see if this is a comment */
 676                 if (bufline[0] == COMMENT_CHARACTER)
 677                         continue;
 678
 679                 if (count >= sizeof(line)) {
 680                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 681                         continue;
 682                 }
 683
 684                 /* skip backslash and newline from multiline rules */
 685                 for (i = j = 0; i < count; i++) {
 686                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 687                                 continue;
 688
 689                         line[j++] = bufline[i];
 690                 }
 691                 line[j] = '\0';
 692
 693                 dbg("read '%s'", line);
 694                 add_to_rules(rules, line, filename, lineno);
 695         }
 696
 697         file_unmap(buf, bufsize);
 698         return retval;
 699 }
 700
 701 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 702 {
 703         struct stat stats;
 704         int retval;
 705
 706         memset(rules, 0x00, sizeof(struct udev_rules));
 707         rules->resolve_names = resolve_names;
 708
 709         /* parse rules file or all matching files in directory */
 710         if (stat(udev_rules_dir, &stats) != 0)
 711                 return -1;
 712
 713         if ((stats.st_mode & S_IFMT) != S_IFDIR) {
 714                 dbg("parse single rules file '%s'", udev_rules_dir);
 715                 retval = parse_file(rules, udev_rules_dir);
 716         } else {
 717                 struct name_entry *name_loop, *name_tmp;
 718                 LIST_HEAD(name_list);
 719
 720                 dbg("parse rules directory '%s'", udev_rules_dir);
 721                 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
 722
 723                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 724                         if (stat(name_loop->name, &stats) == 0) {
 725                                 if (stats.st_size)
 726                                         parse_file(rules, name_loop->name);
 727                                 else
 728                                         dbg("empty rules file '%s'", name_loop->name);
 729                         } else
 730                                 err("could not read '%s': %s", name_loop->name, strerror(errno));
 731                         list_del(&name_loop->node);
 732                         free(name_loop);
 733                 }
 734         }
 735
 736         return retval;
 737 }
 738
 739 void udev_rules_cleanup(struct udev_rules *rules)
 740 {
 741         if (rules->buf) {
 742                 free(rules->buf);
 743                 rules->buf = NULL;
 744         }
 745 }