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 #include "udev_selinux.h"
  32
  33
  34 void udev_rules_iter_init(struct udev_rules *rules)
  35 {
  36         dbg("bufsize=%zi\n", rules->bufsize);
  37         rules->current = 0;
  38 }
  39
  40 struct udev_rule *udev_rules_iter_next(struct udev_rules *rules)
  41 {
  42         static struct udev_rule *rule;
  43
  44         if (!rules)
  45                 return NULL;
  46
  47         dbg("current=%zi\n", rules->current);
  48         if (rules->current >= rules->bufsize) {
  49                 dbg("no more rules\n");
  50                 return NULL;
  51         }
  52
  53         /* get next rule */
  54         rule = (struct udev_rule *) (rules->buf + rules->current);
  55         rules->current += sizeof(struct udev_rule) + rule->bufsize;
  56
  57         return rule;
  58 }
  59
  60 struct udev_rule *udev_rules_iter_label(struct udev_rules *rules, const char *label)
  61 {
  62         static struct udev_rule *rule;
  63
  64 next:
  65         dbg("current=%zi\n", rules->current);
  66         if (rules->current >= rules->bufsize) {
  67                 dbg("no more rules\n");
  68                 return NULL;
  69         }
  70         rule = (struct udev_rule *) (rules->buf + rules->current);
  71
  72         if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
  73                 dbg("moving forward, looking for label '%s'\n", label);
  74                 rules->current += sizeof(struct udev_rule) + rule->bufsize;
  75                 goto next;
  76         }
  77
  78         dbg("found label '%s'\n", label);
  79         return rule;
  80 }
  81
  82 static int get_key(char **line, char **key, enum key_operation *operation, char **value)
  83 {
  84         char *linepos;
  85         char *temp;
  86
  87         linepos = *line;
  88         if (linepos == NULL && linepos[0] == '\0')
  89                 return -1;
  90
  91         /* skip whitespace */
  92         while (isspace(linepos[0]) || linepos[0] == ',')
  93                 linepos++;
  94
  95         /* get the key */
  96         if (linepos[0] == '\0')
  97                 return -1;
  98         *key = linepos;
  99
 100         while (1) {
 101                 linepos++;
 102                 if (linepos[0] == '\0')
 103                         return -1;
 104                 if (isspace(linepos[0]))
 105                         break;
 106                 if (linepos[0] == '=')
 107                         break;
 108                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 109                         if (linepos[1] == '=')
 110                                 break;
 111         }
 112
 113         /* remember end of key */
 114         temp = linepos;
 115
 116         /* skip whitespace after key */
 117         while (isspace(linepos[0]))
 118                 linepos++;
 119         if (linepos[0] == '\0')
 120                 return -1;
 121
 122         /* get operation type */
 123         if (linepos[0] == '=' && linepos[1] == '=') {
 124                 *operation = KEY_OP_MATCH;
 125                 linepos += 2;
 126                 dbg("operator=match\n");
 127         } else if (linepos[0] == '!' && linepos[1] == '=') {
 128                 *operation = KEY_OP_NOMATCH;
 129                 linepos += 2;
 130                 dbg("operator=nomatch\n");
 131         } else if (linepos[0] == '+' && linepos[1] == '=') {
 132                 *operation = KEY_OP_ADD;
 133                 linepos += 2;
 134                 dbg("operator=add\n");
 135         } else if (linepos[0] == '=') {
 136                 *operation = KEY_OP_ASSIGN;
 137                 linepos++;
 138                 dbg("operator=assign\n");
 139         } else if (linepos[0] == ':' && linepos[1] == '=') {
 140                 *operation = KEY_OP_ASSIGN_FINAL;
 141                 linepos += 2;
 142                 dbg("operator=assign_final\n");
 143         } else
 144                 return -1;
 145
 146         /* terminate key */
 147         temp[0] = '\0';
 148         dbg("key='%s'\n", *key);
 149
 150         /* skip whitespace after operator */
 151         while (isspace(linepos[0]))
 152                 linepos++;
 153         if (linepos[0] == '\0')
 154                 return -1;
 155
 156         /* get the value*/
 157         if (linepos[0] == '"')
 158                 linepos++;
 159         else
 160                 return -1;
 161         *value = linepos;
 162
 163         temp = strchr(linepos, '"');
 164         if (!temp)
 165                 return -1;
 166         temp[0] = '\0';
 167         temp++;
 168         dbg("value='%s'\n", *value);
 169
 170         /* move line to next key */
 171         *line = temp;
 172
 173         return 0;
 174 }
 175
 176 /* extract possible KEY{attr} */
 177 static char *get_key_attribute(char *str)
 178 {
 179         char *pos;
 180         char *attr;
 181
 182         attr = strchr(str, '{');
 183         if (attr != NULL) {
 184                 attr++;
 185                 pos = strchr(attr, '}');
 186                 if (pos == NULL) {
 187                         err("missing closing brace for format\n");
 188                         return NULL;
 189                 }
 190                 pos[0] = '\0';
 191                 dbg("attribute='%s'\n", attr);
 192                 return attr;
 193         }
 194
 195         return NULL;
 196 }
 197
 198 static int add_rule_key(struct udev_rule *rule, struct key *key,
 199                         enum key_operation operation, const char *value)
 200 {
 201         size_t val_len = strnlen(value, PATH_SIZE);
 202
 203         key->operation = operation;
 204
 205         key->val_off = rule->bufsize;
 206         strlcpy(rule->buf + rule->bufsize, value, val_len+1);
 207         rule->bufsize += val_len+1;
 208
 209         return 0;
 210 }
 211
 212 static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
 213                              enum key_operation operation, const char *key, const char *value)
 214 {
 215         size_t key_len = strnlen(key, PATH_SIZE);
 216
 217         if (pairs->count >= PAIRS_MAX) {
 218                 err("skip, too many keys of the same type in a single rule\n");
 219                 return -1;
 220         }
 221
 222         add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
 223
 224         /* add the key-name of the pair */
 225         pairs->keys[pairs->count].key_name_off = rule->bufsize;
 226         strlcpy(rule->buf + rule->bufsize, key, key_len+1);
 227         rule->bufsize += key_len+1;
 228
 229         pairs->count++;
 230
 231         return 0;
 232 }
 233
 234 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
 235 {
 236         char buf[sizeof(struct udev_rule) + LINE_SIZE];
 237         struct udev_rule *rule;
 238         size_t rule_size;
 239         int valid;
 240         char *linepos;
 241         char *attr;
 242         size_t padding;
 243         int physdev = 0;
 244         int retval;
 245
 246         memset(buf, 0x00, sizeof(buf));
 247         rule = (struct udev_rule *) buf;
 248         rule->event_timeout = -1;
 249         linepos = line;
 250         valid = 0;
 251
 252         /* get all the keys */
 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\n");
 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\n");
 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\n");
 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\n");
 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' \n"
 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\n");
 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\n");
 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\n");
 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\n");
 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\n");
 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\n");
 378                                 goto invalid;
 379                         }
 380                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 381                         if (attr == NULL) {
 382                                 err("error parsing ATTRS attribute\n");
 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, \n"
 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, \n"
 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\n");
 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\n");
 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 != NULL && strstr(attr, "program")) {
 431                                 dbg("IMPORT will be executed\n");
 432                                 rule->import_type  = IMPORT_PROGRAM;
 433                         } else if (attr != NULL && strstr(attr, "file")) {
 434                                 dbg("IMPORT will be included as file\n");
 435                                 rule->import_type  = IMPORT_FILE;
 436                         } else if (attr != NULL && strstr(attr, "parent")) {
 437                                 dbg("IMPORT will include the parent values\n");
 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 statbuf;
 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'\n", file);
 460                                 if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
 461                                         dbg("IMPORT is executable, will be executed (autotype)\n");
 462                                         rule->import_type  = IMPORT_PROGRAM;
 463                                 } else {
 464                                         dbg("IMPORT is not executable, will be included as file (autotype)\n");
 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                         if (operation != KEY_OP_MATCH &&
 475                             operation != KEY_OP_NOMATCH) {
 476                                 err("invalid TEST operation\n");
 477                                 goto invalid;
 478                         }
 479                         attr = get_key_attribute(key + sizeof("TEST")-1);
 480                         if (attr != NULL)
 481                                 rule->test_mode_mask = strtol(attr, NULL, 8);
 482                         add_rule_key(rule, &rule->test, operation, value);
 483                         valid = 1;
 484                         continue;
 485                 }
 486
 487                 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
 488                         attr = get_key_attribute(key + sizeof("RUN")-1);
 489                         if (attr != NULL) {
 490                                 if (strstr(attr, "ignore_error"))
 491                                         rule->run_ignore_error = 1;
 492                         }
 493                         add_rule_key(rule, &rule->run, operation, value);
 494                         valid = 1;
 495                         continue;
 496                 }
 497
 498                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 499                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 500                         valid = 1;
 501                         continue;
 502                 }
 503
 504                 if (strcasecmp(key, "LABEL") == 0) {
 505                         add_rule_key(rule, &rule->label, operation, value);
 506                         valid = 1;
 507                         continue;
 508                 }
 509
 510                 if (strcasecmp(key, "GOTO") == 0) {
 511                         add_rule_key(rule, &rule->goto_label, operation, value);
 512                         valid = 1;
 513                         continue;
 514                 }
 515
 516                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 517                         attr = get_key_attribute(key + sizeof("NAME")-1);
 518                         if (attr != NULL) {
 519                                 if (strstr(attr, "all_partitions") != NULL) {
 520                                         dbg("creation of partition nodes requested\n");
 521                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 522                                 }
 523                                 if (strstr(attr, "ignore_remove") != NULL) {
 524                                         dbg("remove event should be ignored\n");
 525                                         rule->ignore_remove = 1;
 526                                 }
 527                         }
 528                         if (value[0] == '\0')
 529                                 dbg("name empty, node creation supressed\n");
 530                         add_rule_key(rule, &rule->name, operation, value);
 531                         continue;
 532                 }
 533
 534                 if (strcasecmp(key, "SYMLINK") == 0) {
 535                         if (operation == KEY_OP_MATCH ||
 536                             operation == KEY_OP_NOMATCH)
 537                                 add_rule_key(rule, &rule->symlink_match, operation, value);
 538                         else
 539                                 add_rule_key(rule, &rule->symlink, operation, value);
 540                         valid = 1;
 541                         continue;
 542                 }
 543
 544                 if (strcasecmp(key, "OWNER") == 0) {
 545                         valid = 1;
 546                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 547                                 char *endptr;
 548                                 strtoul(value, &endptr, 10);
 549                                 if (endptr[0] != '\0') {
 550                                         char owner[32];
 551                                         uid_t uid = lookup_user(value);
 552                                         dbg("replacing username='%s' by id=%i\n", value, uid);
 553                                         sprintf(owner, "%u", (unsigned int) uid);
 554                                         add_rule_key(rule, &rule->owner, operation, owner);
 555                                         continue;
 556                                 }
 557                         }
 558
 559                         add_rule_key(rule, &rule->owner, operation, value);
 560                         continue;
 561                 }
 562
 563                 if (strcasecmp(key, "GROUP") == 0) {
 564                         valid = 1;
 565                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 566                                 char *endptr;
 567                                 strtoul(value, &endptr, 10);
 568                                 if (endptr[0] != '\0') {
 569                                         char group[32];
 570                                         gid_t gid = lookup_group(value);
 571                                         dbg("replacing groupname='%s' by id=%i\n", value, gid);
 572                                         sprintf(group, "%u", (unsigned int) gid);
 573                                         add_rule_key(rule, &rule->group, operation, group);
 574                                         continue;
 575                                 }
 576                         }
 577
 578                         add_rule_key(rule, &rule->group, operation, value);
 579                         continue;
 580                 }
 581
 582                 if (strcasecmp(key, "MODE") == 0) {
 583                         add_rule_key(rule, &rule->mode, operation, value);
 584                         valid = 1;
 585                         continue;
 586                 }
 587
 588                 if (strcasecmp(key, "OPTIONS") == 0) {
 589                         const char *pos;
 590
 591                         if (strstr(value, "last_rule") != NULL) {
 592                                 dbg("last rule to be applied\n");
 593                                 rule->last_rule = 1;
 594                         }
 595                         if (strstr(value, "ignore_device") != NULL) {
 596                                 dbg("device should be ignored\n");
 597                                 rule->ignore_device = 1;
 598                         }
 599                         if (strstr(value, "ignore_remove") != NULL) {
 600                                 dbg("remove event should be ignored\n");
 601                                 rule->ignore_remove = 1;
 602                         }
 603                         pos = strstr(value, "link_priority=");
 604                         if (pos != NULL) {
 605                                 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 606                                 dbg("link priority=%i\n", rule->link_priority);
 607                         }
 608                         pos = strstr(value, "event_timeout=");
 609                         if (pos != NULL) {
 610                                 rule->event_timeout = atoi(&pos[strlen("event_timeout=")]);
 611                                 dbg("event timout=%i\n", rule->event_timeout);
 612                         }
 613                         pos = strstr(value, "string_escape=");
 614                         if (pos != NULL) {
 615                                 pos = &pos[strlen("string_escape=")];
 616                                 if (strncmp(pos, "none", strlen("none")) == 0)
 617                                         rule->string_escape = ESCAPE_NONE;
 618                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
 619                                         rule->string_escape = ESCAPE_REPLACE;
 620                         }
 621                         if (strstr(value, "all_partitions") != NULL) {
 622                                 dbg("creation of partition nodes requested\n");
 623                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 624                         }
 625                         valid = 1;
 626                         continue;
 627                 }
 628
 629                 err("unknown key '%s' in %s:%u\n", key, filename, lineno);
 630         }
 631
 632         if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
 633                 err("PHYSDEV* values are deprecated and will be removed from a future kernel, \n"
 634                     "please fix it in %s:%u", filename, lineno);
 635
 636         /* skip line if not any valid key was found */
 637         if (!valid)
 638                 goto invalid;
 639
 640         /* grow buffer and add rule */
 641         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 642         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 643         dbg("add %zi padding bytes\n", padding);
 644         rule_size += padding;
 645         rule->bufsize += padding;
 646
 647         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 648         if (!rules->buf) {
 649                 err("realloc failed\n");
 650                 goto exit;
 651         }
 652         dbg("adding rule to offset %zi\n", rules->bufsize);
 653         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 654         rules->bufsize += rule_size;
 655 exit:
 656         return 0;
 657
 658 invalid:
 659         err("invalid rule '%s:%u'\n", filename, lineno);
 660         return -1;
 661 }
 662
 663 static int parse_file(struct udev_rules *rules, const char *filename)
 664 {
 665         char line[LINE_SIZE];
 666         char *bufline;
 667         unsigned int lineno;
 668         char *buf;
 669         size_t bufsize;
 670         size_t cur;
 671         size_t count;
 672         int retval = 0;
 673
 674         if (file_map(filename, &buf, &bufsize) != 0) {
 675                 err("can't open '%s' as rules file: %s\n", filename, strerror(errno));
 676                 return -1;
 677         }
 678         info("reading '%s' as rules file\n", filename);
 679
 680         /* loop through the whole file */
 681         cur = 0;
 682         lineno = 0;
 683         while (cur < bufsize) {
 684                 unsigned int i, j;
 685
 686                 count = buf_get_line(buf, bufsize, cur);
 687                 bufline = &buf[cur];
 688                 cur += count+1;
 689                 lineno++;
 690
 691                 /* eat the whitespace */
 692                 while ((count > 0) && isspace(bufline[0])) {
 693                         bufline++;
 694                         count--;
 695                 }
 696                 if (count == 0)
 697                         continue;
 698
 699                 /* see if this is a comment */
 700                 if (bufline[0] == COMMENT_CHARACTER)
 701                         continue;
 702
 703                 if (count >= sizeof(line)) {
 704                         err("line too long, rule skipped '%s:%u'\n", filename, lineno);
 705                         continue;
 706                 }
 707
 708                 /* skip backslash and newline from multiline rules */
 709                 for (i = j = 0; i < count; i++) {
 710                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 711                                 continue;
 712
 713                         line[j++] = bufline[i];
 714                 }
 715                 line[j] = '\0';
 716
 717                 dbg("read '%s'\n", line);
 718                 add_to_rules(rules, line, filename, lineno);
 719         }
 720
 721         file_unmap(buf, bufsize);
 722         return retval;
 723 }
 724
 725 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 726 {
 727         struct stat statbuf;
 728         char filename[PATH_MAX];
 729         LIST_HEAD(name_list);
 730         LIST_HEAD(dyn_list);
 731         struct name_entry *name_loop, *name_tmp;
 732         struct name_entry *dyn_loop, *dyn_tmp;
 733         int retval = 0;
 734
 735         memset(rules, 0x00, sizeof(struct udev_rules));
 736         rules->resolve_names = resolve_names;
 737
 738         /* read main config from single file or all files in a directory */
 739         if (stat(udev_rules_dir, &statbuf) != 0)
 740                 return -1;
 741         if ((statbuf.st_mode & S_IFMT) != S_IFDIR) {
 742                 dbg("parse single rules file '%s'\n", udev_rules_dir);
 743                 name_list_add(&name_list, udev_rules_dir, 1);
 744         } else {
 745                 dbg("parse rules directory '%s'\n", udev_rules_dir);
 746                 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
 747         }
 748
 749         /* read dynamic rules directory */
 750         strlcpy(filename, udev_root, sizeof(filename));
 751         strlcat(filename, "/"RULES_DYN_DIR, sizeof(filename));
 752         if (stat(filename, &statbuf) != 0) {
 753                 create_path(filename);
 754                 selinux_setfscreatecon(filename, NULL, S_IFDIR|0755);
 755                 mkdir(filename, 0755);
 756                 selinux_resetfscreatecon();
 757         }
 758         add_matching_files(&dyn_list, filename, RULESFILE_SUFFIX);
 759
 760         /* sort dynamic rules files by basename into list of files */
 761         list_for_each_entry_safe(dyn_loop, dyn_tmp, &dyn_list, node) {
 762                 const char *dyn_base = strrchr(dyn_loop->name, '/');
 763
 764                 if (dyn_base == NULL)
 765                         continue;
 766
 767                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 768                         const char *name_base = strrchr(name_loop->name, '/');
 769
 770                         if (name_base == NULL)
 771                                 continue;
 772
 773                         if (strcmp(name_base, dyn_base) > 0)
 774                                 break;
 775                 }
 776                 list_move_tail(&dyn_loop->node, &name_loop->node);
 777         }
 778
 779         /* parse list of files */
 780         list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 781                 if (stat(name_loop->name, &statbuf) == 0) {
 782                         if (statbuf.st_size)
 783                                 parse_file(rules, name_loop->name);
 784                         else
 785                                 dbg("empty rules file '%s'\n", name_loop->name);
 786                 } else
 787                         err("could not read '%s': %s\n", name_loop->name, strerror(errno));
 788                 list_del(&name_loop->node);
 789                 free(name_loop);
 790         }
 791
 792         return retval;
 793 }
 794
 795 void udev_rules_cleanup(struct udev_rules *rules)
 796 {
 797         if (rules->buf) {
 798                 free(rules->buf);
 799                 rules->buf = NULL;
 800         }
 801 }
 802