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         char buf[sizeof(struct udev_rule) + LINE_SIZE];
 236         struct udev_rule *rule;
 237         size_t rule_size;
 238         int valid;
 239         char *linepos;
 240         char *attr;
 241         size_t padding;
 242         int physdev = 0;
 243         int retval;
 244
 245         memset(buf, 0x00, sizeof(buf));
 246         rule = (struct udev_rule *) buf;
 247         linepos = line;
 248         valid = 0;
 249
 250         /* get all the keys */
 251         while (1) {
 252                 char *key;
 253                 char *value;
 254                 enum key_operation operation = KEY_OP_UNSET;
 255
 256                 retval = get_key(&linepos, &key, &operation, &value);
 257                 if (retval)
 258                         break;
 259
 260                 if (strcasecmp(key, "ACTION") == 0) {
 261                         if (operation != KEY_OP_MATCH &&
 262                             operation != KEY_OP_NOMATCH) {
 263                                 err("invalid ACTION operation");
 264                                 goto invalid;
 265                         }
 266                         add_rule_key(rule, &rule->action, operation, value);
 267                         valid = 1;
 268                         continue;
 269                 }
 270
 271                 if (strcasecmp(key, "DEVPATH") == 0) {
 272                         if (operation != KEY_OP_MATCH &&
 273                             operation != KEY_OP_NOMATCH) {
 274                                 err("invalid DEVPATH operation");
 275                                 goto invalid;
 276                         }
 277                         add_rule_key(rule, &rule->devpath, operation, value);
 278                         valid = 1;
 279                         continue;
 280                 }
 281
 282                 if (strcasecmp(key, "KERNEL") == 0) {
 283                         if (operation != KEY_OP_MATCH &&
 284                             operation != KEY_OP_NOMATCH) {
 285                                 err("invalid KERNEL operation");
 286                                 goto invalid;
 287                         }
 288                         add_rule_key(rule, &rule->kernel, operation, value);
 289                         valid = 1;
 290                         continue;
 291                 }
 292
 293                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 294                         if (operation != KEY_OP_MATCH &&
 295                             operation != KEY_OP_NOMATCH) {
 296                                 err("invalid SUBSYSTEM operation");
 297                                 goto invalid;
 298                         }
 299                         /* bus, class, subsystem events should all be the same */
 300                         if (strcmp(value, "subsystem") == 0 ||
 301                             strcmp(value, "bus") == 0 ||
 302                             strcmp(value, "class") == 0) {
 303                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
 304                                         err("'%s' must be specified as 'subsystem' "
 305                                             "please fix it in %s:%u", value, filename, lineno);
 306                                 add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
 307                         } else
 308                                 add_rule_key(rule, &rule->subsystem, operation, value);
 309                         valid = 1;
 310                         continue;
 311                 }
 312
 313                 if (strcasecmp(key, "DRIVER") == 0) {
 314                         if (operation != KEY_OP_MATCH &&
 315                             operation != KEY_OP_NOMATCH) {
 316                                 err("invalid DRIVER operation");
 317                                 goto invalid;
 318                         }
 319                         add_rule_key(rule, &rule->driver, operation, value);
 320                         valid = 1;
 321                         continue;
 322                 }
 323
 324                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 325                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 326                         if (attr == NULL) {
 327                                 err("error parsing ATTR attribute");
 328                                 goto invalid;
 329                         }
 330                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 331                                 goto invalid;
 332                         valid = 1;
 333                         continue;
 334                 }
 335
 336                 if (strcasecmp(key, "KERNELS") == 0 ||
 337                     strcasecmp(key, "ID") == 0) {
 338                         if (operation != KEY_OP_MATCH &&
 339                             operation != KEY_OP_NOMATCH) {
 340                                 err("invalid KERNELS operation");
 341                                 goto invalid;
 342                         }
 343                         add_rule_key(rule, &rule->kernels, operation, value);
 344                         valid = 1;
 345                         continue;
 346                 }
 347
 348                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 349                     strcasecmp(key, "BUS") == 0) {
 350                         if (operation != KEY_OP_MATCH &&
 351                             operation != KEY_OP_NOMATCH) {
 352                                 err("invalid SUBSYSTEMS operation");
 353                                 goto invalid;
 354                         }
 355                         add_rule_key(rule, &rule->subsystems, operation, value);
 356                         valid = 1;
 357                         continue;
 358                 }
 359
 360                 if (strcasecmp(key, "DRIVERS") == 0) {
 361                         if (operation != KEY_OP_MATCH &&
 362                             operation != KEY_OP_NOMATCH) {
 363                                 err("invalid DRIVERS operation");
 364                                 goto invalid;
 365                         }
 366                         add_rule_key(rule, &rule->drivers, operation, value);
 367                         valid = 1;
 368                         continue;
 369                 }
 370
 371                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 372                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 373                         if (operation != KEY_OP_MATCH &&
 374                             operation != KEY_OP_NOMATCH) {
 375                                 err("invalid ATTRS operation");
 376                                 goto invalid;
 377                         }
 378                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 379                         if (attr == NULL) {
 380                                 err("error parsing ATTRS attribute");
 381                                 goto invalid;
 382                         }
 383                         if (strncmp(attr, "device/", 7) == 0)
 384                                 err("the 'device' link is deprecated and will be removed from a future kernel, "
 385                                     "please fix it in %s:%u", filename, lineno);
 386                         else if (strstr(attr, "../") != NULL)
 387                                 err("do not reference parent sysfs directories directly, that may break with a future kernel, "
 388                                     "please fix it in %s:%u", filename, lineno);
 389                         if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 390                                 goto invalid;
 391                         valid = 1;
 392                         continue;
 393                 }
 394
 395                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 396                         attr = get_key_attribute(key + sizeof("ENV")-1);
 397                         if (attr == NULL) {
 398                                 err("error parsing ENV attribute");
 399                                 goto invalid;
 400                         }
 401                         if (strncmp(attr, "PHYSDEV", 7) == 0)
 402                                 physdev = 1;
 403                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 404                                 goto invalid;
 405                         valid = 1;
 406                         continue;
 407                 }
 408
 409                 if (strcasecmp(key, "PROGRAM") == 0) {
 410                         add_rule_key(rule, &rule->program, operation, value);
 411                         valid = 1;
 412                         continue;
 413                 }
 414
 415                 if (strcasecmp(key, "RESULT") == 0) {
 416                         if (operation != KEY_OP_MATCH &&
 417                             operation != KEY_OP_NOMATCH) {
 418                                 err("invalid RESULT operation");
 419                                 goto invalid;
 420                         }
 421                         add_rule_key(rule, &rule->result, operation, value);
 422                         valid = 1;
 423                         continue;
 424                 }
 425
 426                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 427                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 428                         if (attr && strstr(attr, "program")) {
 429                                 dbg("IMPORT will be executed");
 430                                 rule->import_type  = IMPORT_PROGRAM;
 431                         } else if (attr && strstr(attr, "file")) {
 432                                 dbg("IMPORT will be included as file");
 433                                 rule->import_type  = IMPORT_FILE;
 434                         } else if (attr && strstr(attr, "parent")) {
 435                                 dbg("IMPORT will include the parent values");
 436                                 rule->import_type = IMPORT_PARENT;
 437                         } else {
 438                                 /* figure it out if it is executable */
 439                                 char file[PATH_SIZE];
 440                                 char *pos;
 441                                 struct stat stats;
 442
 443                                 strlcpy(file, value, sizeof(file));
 444                                 pos = strchr(file, ' ');
 445                                 if (pos)
 446                                         pos[0] = '\0';
 447
 448                                 /* allow programs in /lib/udev called without the path */
 449                                 if (strchr(file, '/') == NULL) {
 450                                         strlcpy(file, "/lib/udev/", sizeof(file));
 451                                         strlcat(file, value, sizeof(file));
 452                                         pos = strchr(file, ' ');
 453                                         if (pos)
 454                                                 pos[0] = '\0';
 455                                 }
 456
 457                                 dbg("IMPORT auto mode for '%s'", file);
 458                                 if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
 459                                         dbg("IMPORT is executable, will be executed (autotype)");
 460                                         rule->import_type  = IMPORT_PROGRAM;
 461                                 } else {
 462                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 463                                         rule->import_type  = IMPORT_FILE;
 464                                 }
 465                         }
 466                         add_rule_key(rule, &rule->import, operation, value);
 467                         valid = 1;
 468                         continue;
 469                 }
 470
 471                 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
 472                         attr = get_key_attribute(key + sizeof("TEST")-1);
 473                         if (attr != NULL)
 474                                 rule->test_mode_mask = strtol(attr, NULL, 8);
 475                         add_rule_key(rule, &rule->test, operation, value);
 476                         valid = 1;
 477                         continue;
 478                 }
 479
 480                 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
 481                         attr = get_key_attribute(key + sizeof("RUN")-1);
 482                         if (attr && strstr(attr, "ignore_error"))
 483                                 rule->run_ignore_error = 1;
 484                         add_rule_key(rule, &rule->run, operation, value);
 485                         valid = 1;
 486                         continue;
 487                 }
 488
 489                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 490                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 491                         valid = 1;
 492                         continue;
 493                 }
 494
 495                 if (strcasecmp(key, "LABEL") == 0) {
 496                         add_rule_key(rule, &rule->label, operation, value);
 497                         valid = 1;
 498                         continue;
 499                 }
 500
 501                 if (strcasecmp(key, "GOTO") == 0) {
 502                         add_rule_key(rule, &rule->goto_label, operation, value);
 503                         valid = 1;
 504                         continue;
 505                 }
 506
 507                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 508                         attr = get_key_attribute(key + sizeof("NAME")-1);
 509                         if (attr != NULL) {
 510                                 if (strstr(attr, "all_partitions") != NULL) {
 511                                         dbg("creation of partition nodes requested");
 512                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 513                                 }
 514                                 if (strstr(attr, "ignore_remove") != NULL) {
 515                                         dbg("remove event should be ignored");
 516                                         rule->ignore_remove = 1;
 517                                 }
 518                         }
 519                         if (value[0] == '\0')
 520                                 dbg("name empty, node creation supressed");
 521                         add_rule_key(rule, &rule->name, operation, value);
 522                         continue;
 523                 }
 524
 525                 if (strcasecmp(key, "SYMLINK") == 0) {
 526                         add_rule_key(rule, &rule->symlink, operation, value);
 527                         valid = 1;
 528                         continue;
 529                 }
 530
 531                 if (strcasecmp(key, "OWNER") == 0) {
 532                         valid = 1;
 533                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 534                                 char *endptr;
 535                                 strtoul(value, &endptr, 10);
 536                                 if (endptr[0] != '\0') {
 537                                         char owner[32];
 538                                         uid_t uid = lookup_user(value);
 539                                         dbg("replacing username='%s' by id=%i", value, uid);
 540                                         sprintf(owner, "%u", (unsigned int) uid);
 541                                         add_rule_key(rule, &rule->owner, operation, owner);
 542                                         continue;
 543                                 }
 544                         }
 545
 546                         add_rule_key(rule, &rule->owner, operation, value);
 547                         continue;
 548                 }
 549
 550                 if (strcasecmp(key, "GROUP") == 0) {
 551                         valid = 1;
 552                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 553                                 char *endptr;
 554                                 strtoul(value, &endptr, 10);
 555                                 if (endptr[0] != '\0') {
 556                                         char group[32];
 557                                         gid_t gid = lookup_group(value);
 558                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 559                                         sprintf(group, "%u", (unsigned int) gid);
 560                                         add_rule_key(rule, &rule->group, operation, group);
 561                                         continue;
 562                                 }
 563                         }
 564
 565                         add_rule_key(rule, &rule->group, operation, value);
 566                         continue;
 567                 }
 568
 569                 if (strcasecmp(key, "MODE") == 0) {
 570                         rule->mode = strtol(value, NULL, 8);
 571                         rule->mode_operation = operation;
 572                         valid = 1;
 573                         continue;
 574                 }
 575
 576                 if (strcasecmp(key, "OPTIONS") == 0) {
 577                         const char *pos;
 578
 579                         if (strstr(value, "last_rule") != NULL) {
 580                                 dbg("last rule to be applied");
 581                                 rule->last_rule = 1;
 582                         }
 583                         if (strstr(value, "ignore_device") != NULL) {
 584                                 dbg("device should be ignored");
 585                                 rule->ignore_device = 1;
 586                         }
 587                         if (strstr(value, "ignore_remove") != NULL) {
 588                                 dbg("remove event should be ignored");
 589                                 rule->ignore_remove = 1;
 590                         }
 591                         pos = strstr(value, "link_priority=");
 592                         if (pos != NULL) {
 593                                 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 594                                 info("link priority=%i", rule->link_priority);
 595                         }
 596                         pos = strstr(value, "string_escape=");
 597                         if (pos != NULL) {
 598                                 pos = &pos[strlen("string_escape=")];
 599                                 if (strncmp(pos, "none", strlen("none")) == 0)
 600                                         rule->string_escape = ESCAPE_NONE;
 601                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
 602                                         rule->string_escape = ESCAPE_REPLACE;
 603                         }
 604                         if (strstr(value, "all_partitions") != NULL) {
 605                                 dbg("creation of partition nodes requested");
 606                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 607                         }
 608                         valid = 1;
 609                         continue;
 610                 }
 611
 612                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 613         }
 614
 615         if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
 616                 err("PHYSDEV* values are deprecated and will be removed from a future kernel, "
 617                     "please fix it in %s:%u", filename, lineno);
 618
 619         /* skip line if not any valid key was found */
 620         if (!valid)
 621                 goto invalid;
 622
 623         /* grow buffer and add rule */
 624         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 625         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 626         dbg("add %zi padding bytes", padding);
 627         rule_size += padding;
 628         rule->bufsize += padding;
 629
 630         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 631         if (!rules->buf) {
 632                 err("realloc failed");
 633                 goto exit;
 634         }
 635         dbg("adding rule to offset %zi", rules->bufsize);
 636         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 637         rules->bufsize += rule_size;
 638 exit:
 639         return 0;
 640
 641 invalid:
 642         err("invalid rule '%s:%u'", filename, lineno);
 643         return -1;
 644 }
 645
 646 static int parse_file(struct udev_rules *rules, const char *filename)
 647 {
 648         char line[LINE_SIZE];
 649         char *bufline;
 650         unsigned int lineno;
 651         char *buf;
 652         size_t bufsize;
 653         size_t cur;
 654         size_t count;
 655         int retval = 0;
 656
 657         if (file_map(filename, &buf, &bufsize) != 0) {
 658                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 659                 return -1;
 660         }
 661         info("reading '%s' as rules file", filename);
 662
 663         /* loop through the whole file */
 664         cur = 0;
 665         lineno = 0;
 666         while (cur < bufsize) {
 667                 unsigned int i, j;
 668
 669                 count = buf_get_line(buf, bufsize, cur);
 670                 bufline = &buf[cur];
 671                 cur += count+1;
 672                 lineno++;
 673
 674                 /* eat the whitespace */
 675                 while ((count > 0) && isspace(bufline[0])) {
 676                         bufline++;
 677                         count--;
 678                 }
 679                 if (count == 0)
 680                         continue;
 681
 682                 /* see if this is a comment */
 683                 if (bufline[0] == COMMENT_CHARACTER)
 684                         continue;
 685
 686                 if (count >= sizeof(line)) {
 687                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 688                         continue;
 689                 }
 690
 691                 /* skip backslash and newline from multiline rules */
 692                 for (i = j = 0; i < count; i++) {
 693                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 694                                 continue;
 695
 696                         line[j++] = bufline[i];
 697                 }
 698                 line[j] = '\0';
 699
 700                 dbg("read '%s'", line);
 701                 add_to_rules(rules, line, filename, lineno);
 702         }
 703
 704         file_unmap(buf, bufsize);
 705         return retval;
 706 }
 707
 708 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 709 {
 710         struct stat stats;
 711         int retval;
 712
 713         memset(rules, 0x00, sizeof(struct udev_rules));
 714         rules->resolve_names = resolve_names;
 715
 716         /* parse rules file or all matching files in directory */
 717         if (stat(udev_rules_dir, &stats) != 0)
 718                 return -1;
 719
 720         if ((stats.st_mode & S_IFMT) != S_IFDIR) {
 721                 dbg("parse single rules file '%s'", udev_rules_dir);
 722                 retval = parse_file(rules, udev_rules_dir);
 723         } else {
 724                 struct name_entry *name_loop, *name_tmp;
 725                 LIST_HEAD(name_list);
 726
 727                 dbg("parse rules directory '%s'", udev_rules_dir);
 728                 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
 729
 730                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 731                         if (stat(name_loop->name, &stats) == 0) {
 732                                 if (stats.st_size)
 733                                         parse_file(rules, name_loop->name);
 734                                 else
 735                                         dbg("empty rules file '%s'", name_loop->name);
 736                         } else
 737                                 err("could not read '%s': %s", name_loop->name, strerror(errno));
 738                         list_del(&name_loop->node);
 739                         free(name_loop);
 740                 }
 741         }
 742
 743         return retval;
 744 }
 745
 746 void udev_rules_cleanup(struct udev_rules *rules)
 747 {
 748         if (rules->buf) {
 749                 free(rules->buf);
 750                 rules->buf = NULL;
 751         }
 752 }