udev/udev-rules-parse.c

   1 /*
   2  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2008 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <stdio.h>
  23 #include <ctype.h>
  24 #include <unistd.h>
  25 #include <dirent.h>
  26 #include <errno.h>
  27 #include <sys/stat.h>
  28
  29 #include "udev.h"
  30 #include "udev-rules.h"
  31
  32
  33 void udev_rules_iter_init(struct udev_rules_iter *iter, struct udev_rules *rules)
  34 {
  35         dbg(rules->udev, "bufsize=%zi\n", rules->bufsize);
  36         iter->rules = rules;
  37         iter->current = 0;
  38 }
  39
  40 struct udev_rule *udev_rules_iter_next(struct udev_rules_iter *iter)
  41 {
  42         struct udev_rules *rules;
  43         struct udev_rule *rule;
  44
  45         rules = iter->rules;
  46         if (!rules)
  47                 return NULL;
  48
  49         dbg(rules->udev, "current=%zi\n", iter->current);
  50         if (iter->current >= rules->bufsize) {
  51                 dbg(rules->udev, "no more rules\n");
  52                 return NULL;
  53         }
  54
  55         /* get next rule */
  56         rule = (struct udev_rule *) (rules->buf + iter->current);
  57         iter->current += sizeof(struct udev_rule) + rule->bufsize;
  58
  59         return rule;
  60 }
  61
  62 struct udev_rule *udev_rules_iter_goto(struct udev_rules_iter *iter, size_t rule_off)
  63 {
  64         struct udev_rules *rules = iter->rules;
  65         struct udev_rule *rule;
  66
  67         dbg(rules->udev, "current=%zi\n", iter->current);
  68         iter->current = rule_off;
  69         rule = (struct udev_rule *) (rules->buf + iter->current);
  70
  71         return rule;
  72 }
  73
  74 static size_t find_label(const struct udev_rules_iter *iter, const char *label)
  75 {
  76         struct udev_rule *rule;
  77         struct udev_rules *rules = iter->rules;
  78         size_t current = iter->current;
  79
  80 next:
  81         dbg(rules->udev, "current=%zi\n", current);
  82         if (current >= rules->bufsize) {
  83                 dbg(rules->udev, "LABEL='%s' not found\n", label);
  84                 return 0;
  85         }
  86         rule = (struct udev_rule *) (rules->buf + current);
  87
  88         if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
  89                 dbg(rules->udev, "moving forward, looking for label '%s'\n", label);
  90                 current += sizeof(struct udev_rule) + rule->bufsize;
  91                 goto next;
  92         }
  93
  94         dbg(rules->udev, "found label '%s'\n", label);
  95         return current;
  96 }
  97
  98 static int get_key(struct udev_rules *rules, char **line, char **key, enum key_operation *operation, char **value)
  99 {
 100         char *linepos;
 101         char *temp;
 102
 103         linepos = *line;
 104         if (linepos == NULL && linepos[0] == '\0')
 105                 return -1;
 106
 107         /* skip whitespace */
 108         while (isspace(linepos[0]) || linepos[0] == ',')
 109                 linepos++;
 110
 111         /* get the key */
 112         if (linepos[0] == '\0')
 113                 return -1;
 114         *key = linepos;
 115
 116         while (1) {
 117                 linepos++;
 118                 if (linepos[0] == '\0')
 119                         return -1;
 120                 if (isspace(linepos[0]))
 121                         break;
 122                 if (linepos[0] == '=')
 123                         break;
 124                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 125                         if (linepos[1] == '=')
 126                                 break;
 127         }
 128
 129         /* remember end of key */
 130         temp = linepos;
 131
 132         /* skip whitespace after key */
 133         while (isspace(linepos[0]))
 134                 linepos++;
 135         if (linepos[0] == '\0')
 136                 return -1;
 137
 138         /* get operation type */
 139         if (linepos[0] == '=' && linepos[1] == '=') {
 140                 *operation = KEY_OP_MATCH;
 141                 linepos += 2;
 142                 dbg(rules->udev, "operator=match\n");
 143         } else if (linepos[0] == '!' && linepos[1] == '=') {
 144                 *operation = KEY_OP_NOMATCH;
 145                 linepos += 2;
 146                 dbg(rules->udev, "operator=nomatch\n");
 147         } else if (linepos[0] == '+' && linepos[1] == '=') {
 148                 *operation = KEY_OP_ADD;
 149                 linepos += 2;
 150                 dbg(rules->udev, "operator=add\n");
 151         } else if (linepos[0] == '=') {
 152                 *operation = KEY_OP_ASSIGN;
 153                 linepos++;
 154                 dbg(rules->udev, "operator=assign\n");
 155         } else if (linepos[0] == ':' && linepos[1] == '=') {
 156                 *operation = KEY_OP_ASSIGN_FINAL;
 157                 linepos += 2;
 158                 dbg(rules->udev, "operator=assign_final\n");
 159         } else
 160                 return -1;
 161
 162         /* terminate key */
 163         temp[0] = '\0';
 164         dbg(rules->udev, "key='%s'\n", *key);
 165
 166         /* skip whitespace after operator */
 167         while (isspace(linepos[0]))
 168                 linepos++;
 169         if (linepos[0] == '\0')
 170                 return -1;
 171
 172         /* get the value*/
 173         if (linepos[0] == '"')
 174                 linepos++;
 175         else
 176                 return -1;
 177         *value = linepos;
 178
 179         temp = strchr(linepos, '"');
 180         if (!temp)
 181                 return -1;
 182         temp[0] = '\0';
 183         temp++;
 184         dbg(rules->udev, "value='%s'\n", *value);
 185
 186         /* move line to next key */
 187         *line = temp;
 188
 189         return 0;
 190 }
 191
 192 /* extract possible KEY{attr} */
 193 static char *get_key_attribute(struct udev_rules *rules, char *str)
 194 {
 195         char *pos;
 196         char *attr;
 197
 198         attr = strchr(str, '{');
 199         if (attr != NULL) {
 200                 attr++;
 201                 pos = strchr(attr, '}');
 202                 if (pos == NULL) {
 203                         err(rules->udev, "missing closing brace for format\n");
 204                         return NULL;
 205                 }
 206                 pos[0] = '\0';
 207                 dbg(rules->udev, "attribute='%s'\n", attr);
 208                 return attr;
 209         }
 210
 211         return NULL;
 212 }
 213
 214 static int add_rule_key(struct udev_rule *rule, struct key *key,
 215                         enum key_operation operation, const char *value)
 216 {
 217         size_t val_len = strnlen(value, UTIL_PATH_SIZE);
 218
 219         key->operation = operation;
 220
 221         key->val_off = rule->bufsize;
 222         util_strlcpy(rule->buf + rule->bufsize, value, val_len+1);
 223         rule->bufsize += val_len+1;
 224
 225         return 0;
 226 }
 227
 228 static int add_rule_key_pair(struct udev_rules *rules, struct udev_rule *rule, struct key_pairs *pairs,
 229                              enum key_operation operation, const char *key, const char *value)
 230 {
 231         size_t key_len = strnlen(key, UTIL_PATH_SIZE);
 232
 233         if (pairs->count >= PAIRS_MAX) {
 234                 err(rules->udev, "skip, too many keys of the same type in a single rule\n");
 235                 return -1;
 236         }
 237
 238         add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
 239
 240         /* add the key-name of the pair */
 241         pairs->keys[pairs->count].key_name_off = rule->bufsize;
 242         util_strlcpy(rule->buf + rule->bufsize, key, key_len+1);
 243         rule->bufsize += key_len+1;
 244
 245         pairs->count++;
 246
 247         return 0;
 248 }
 249
 250 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
 251 {
 252         char buf[sizeof(struct udev_rule) + UTIL_LINE_SIZE];
 253         struct udev_rule *rule;
 254         size_t rule_size;
 255         int valid;
 256         char *linepos;
 257         char *attr;
 258         size_t padding;
 259         int physdev = 0;
 260         int retval;
 261
 262         memset(buf, 0x00, sizeof(buf));
 263         rule = (struct udev_rule *) buf;
 264         rule->event_timeout = -1;
 265         linepos = line;
 266         valid = 0;
 267
 268         /* get all the keys */
 269         while (1) {
 270                 char *key;
 271                 char *value;
 272                 enum key_operation operation = KEY_OP_UNSET;
 273
 274                 retval = get_key(rules, &linepos, &key, &operation, &value);
 275                 if (retval)
 276                         break;
 277
 278                 if (strcasecmp(key, "ACTION") == 0) {
 279                         if (operation != KEY_OP_MATCH &&
 280                             operation != KEY_OP_NOMATCH) {
 281                                 err(rules->udev, "invalid ACTION operation\n");
 282                                 goto invalid;
 283                         }
 284                         add_rule_key(rule, &rule->action, operation, value);
 285                         valid = 1;
 286                         continue;
 287                 }
 288
 289                 if (strcasecmp(key, "DEVPATH") == 0) {
 290                         if (operation != KEY_OP_MATCH &&
 291                             operation != KEY_OP_NOMATCH) {
 292                                 err(rules->udev, "invalid DEVPATH operation\n");
 293                                 goto invalid;
 294                         }
 295                         add_rule_key(rule, &rule->devpath, operation, value);
 296                         valid = 1;
 297                         continue;
 298                 }
 299
 300                 if (strcasecmp(key, "KERNEL") == 0) {
 301                         if (operation != KEY_OP_MATCH &&
 302                             operation != KEY_OP_NOMATCH) {
 303                                 err(rules->udev, "invalid KERNEL operation\n");
 304                                 goto invalid;
 305                         }
 306                         add_rule_key(rule, &rule->kernel, operation, value);
 307                         valid = 1;
 308                         continue;
 309                 }
 310
 311                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 312                         if (operation != KEY_OP_MATCH &&
 313                             operation != KEY_OP_NOMATCH) {
 314                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
 315                                 goto invalid;
 316                         }
 317                         /* bus, class, subsystem events should all be the same */
 318                         if (strcmp(value, "subsystem") == 0 ||
 319                             strcmp(value, "bus") == 0 ||
 320                             strcmp(value, "class") == 0) {
 321                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
 322                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
 323                                             "please fix it in %s:%u", value, filename, lineno);
 324                                 add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
 325                         } else
 326                                 add_rule_key(rule, &rule->subsystem, operation, value);
 327                         valid = 1;
 328                         continue;
 329                 }
 330
 331                 if (strcasecmp(key, "DRIVER") == 0) {
 332                         if (operation != KEY_OP_MATCH &&
 333                             operation != KEY_OP_NOMATCH) {
 334                                 err(rules->udev, "invalid DRIVER operation\n");
 335                                 goto invalid;
 336                         }
 337                         add_rule_key(rule, &rule->driver, operation, value);
 338                         valid = 1;
 339                         continue;
 340                 }
 341
 342                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 343                         attr = get_key_attribute(rules, key + sizeof("ATTR")-1);
 344                         if (attr == NULL) {
 345                                 err(rules->udev, "error parsing ATTR attribute\n");
 346                                 goto invalid;
 347                         }
 348                         if (add_rule_key_pair(rules, rule, &rule->attr, operation, attr, value) != 0)
 349                                 goto invalid;
 350                         valid = 1;
 351                         continue;
 352                 }
 353
 354                 if (strcasecmp(key, "KERNELS") == 0 ||
 355                     strcasecmp(key, "ID") == 0) {
 356                         if (operation != KEY_OP_MATCH &&
 357                             operation != KEY_OP_NOMATCH) {
 358                                 err(rules->udev, "invalid KERNELS operation\n");
 359                                 goto invalid;
 360                         }
 361                         add_rule_key(rule, &rule->kernels, operation, value);
 362                         valid = 1;
 363                         continue;
 364                 }
 365
 366                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 367                     strcasecmp(key, "BUS") == 0) {
 368                         if (operation != KEY_OP_MATCH &&
 369                             operation != KEY_OP_NOMATCH) {
 370                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
 371                                 goto invalid;
 372                         }
 373                         add_rule_key(rule, &rule->subsystems, operation, value);
 374                         valid = 1;
 375                         continue;
 376                 }
 377
 378                 if (strcasecmp(key, "DRIVERS") == 0) {
 379                         if (operation != KEY_OP_MATCH &&
 380                             operation != KEY_OP_NOMATCH) {
 381                                 err(rules->udev, "invalid DRIVERS operation\n");
 382                                 goto invalid;
 383                         }
 384                         add_rule_key(rule, &rule->drivers, operation, value);
 385                         valid = 1;
 386                         continue;
 387                 }
 388
 389                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 390                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 391                         if (operation != KEY_OP_MATCH &&
 392                             operation != KEY_OP_NOMATCH) {
 393                                 err(rules->udev, "invalid ATTRS operation\n");
 394                                 goto invalid;
 395                         }
 396                         attr = get_key_attribute(rules, key + sizeof("ATTRS")-1);
 397                         if (attr == NULL) {
 398                                 err(rules->udev, "error parsing ATTRS attribute\n");
 399                                 goto invalid;
 400                         }
 401                         if (strncmp(attr, "device/", 7) == 0)
 402                                 err(rules->udev, "the 'device' link is deprecated and will be removed from a future kernel, \n"
 403                                     "please fix it in %s:%u", filename, lineno);
 404                         else if (strstr(attr, "../") != NULL)
 405                                 err(rules->udev, "do not reference parent sysfs directories directly, that may break with a future kernel, \n"
 406                                     "please fix it in %s:%u", filename, lineno);
 407                         if (add_rule_key_pair(rules, rule, &rule->attrs, operation, attr, value) != 0)
 408                                 goto invalid;
 409                         valid = 1;
 410                         continue;
 411                 }
 412
 413                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 414                         attr = get_key_attribute(rules, key + sizeof("ENV")-1);
 415                         if (attr == NULL) {
 416                                 err(rules->udev, "error parsing ENV attribute\n");
 417                                 goto invalid;
 418                         }
 419                         if (strncmp(attr, "PHYSDEV", 7) == 0)
 420                                 physdev = 1;
 421                         if (add_rule_key_pair(rules, rule, &rule->env, operation, attr, value) != 0)
 422                                 goto invalid;
 423                         valid = 1;
 424                         continue;
 425                 }
 426
 427                 if (strcasecmp(key, "PROGRAM") == 0) {
 428                         add_rule_key(rule, &rule->program, operation, value);
 429                         valid = 1;
 430                         continue;
 431                 }
 432
 433                 if (strcasecmp(key, "RESULT") == 0) {
 434                         if (operation != KEY_OP_MATCH &&
 435                             operation != KEY_OP_NOMATCH) {
 436                                 err(rules->udev, "invalid RESULT operation\n");
 437                                 goto invalid;
 438                         }
 439                         add_rule_key(rule, &rule->result, operation, value);
 440                         valid = 1;
 441                         continue;
 442                 }
 443
 444                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 445                         attr = get_key_attribute(rules, key + sizeof("IMPORT")-1);
 446                         if (attr != NULL && strstr(attr, "program")) {
 447                                 dbg(rules->udev, "IMPORT will be executed\n");
 448                                 rule->import_type  = IMPORT_PROGRAM;
 449                         } else if (attr != NULL && strstr(attr, "file")) {
 450                                 dbg(rules->udev, "IMPORT will be included as file\n");
 451                                 rule->import_type  = IMPORT_FILE;
 452                         } else if (attr != NULL && strstr(attr, "parent")) {
 453                                 dbg(rules->udev, "IMPORT will include the parent values\n");
 454                                 rule->import_type = IMPORT_PARENT;
 455                         } else {
 456                                 /* figure it out if it is executable */
 457                                 char file[UTIL_PATH_SIZE];
 458                                 char *pos;
 459                                 struct stat statbuf;
 460
 461                                 util_strlcpy(file, value, sizeof(file));
 462                                 pos = strchr(file, ' ');
 463                                 if (pos)
 464                                         pos[0] = '\0';
 465
 466                                 /* allow programs in /lib/udev called without the path */
 467                                 if (strchr(file, '/') == NULL) {
 468                                         util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file));
 469                                         util_strlcat(file, value, sizeof(file));
 470                                         pos = strchr(file, ' ');
 471                                         if (pos)
 472                                                 pos[0] = '\0';
 473                                 }
 474
 475                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
 476                                 if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
 477                                         dbg(rules->udev, "IMPORT is executable, will be executed (autotype)\n");
 478                                         rule->import_type  = IMPORT_PROGRAM;
 479                                 } else {
 480                                         dbg(rules->udev, "IMPORT is not executable, will be included as file (autotype)\n");
 481                                         rule->import_type  = IMPORT_FILE;
 482                                 }
 483                         }
 484                         add_rule_key(rule, &rule->import, operation, value);
 485                         valid = 1;
 486                         continue;
 487                 }
 488
 489                 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
 490                         if (operation != KEY_OP_MATCH &&
 491                             operation != KEY_OP_NOMATCH) {
 492                                 err(rules->udev, "invalid TEST operation\n");
 493                                 goto invalid;
 494                         }
 495                         attr = get_key_attribute(rules, key + sizeof("TEST")-1);
 496                         if (attr != NULL)
 497                                 rule->test_mode_mask = strtol(attr, NULL, 8);
 498                         add_rule_key(rule, &rule->test, operation, value);
 499                         valid = 1;
 500                         continue;
 501                 }
 502
 503                 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
 504                         attr = get_key_attribute(rules, key + sizeof("RUN")-1);
 505                         if (attr != NULL) {
 506                                 if (strstr(attr, "ignore_error"))
 507                                         rule->run_ignore_error = 1;
 508                         }
 509                         add_rule_key(rule, &rule->run, operation, value);
 510                         valid = 1;
 511                         continue;
 512                 }
 513
 514                 if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 515                         add_rule_key(rule, &rule->wait_for, operation, value);
 516                         valid = 1;
 517                         continue;
 518                 }
 519
 520                 if (strcasecmp(key, "LABEL") == 0) {
 521                         add_rule_key(rule, &rule->label, operation, value);
 522                         valid = 1;
 523                         continue;
 524                 }
 525
 526                 if (strcasecmp(key, "GOTO") == 0) {
 527                         add_rule_key(rule, &rule->goto_label, operation, value);
 528                         valid = 1;
 529                         continue;
 530                 }
 531
 532                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 533                         attr = get_key_attribute(rules, key + sizeof("NAME")-1);
 534                         if (attr != NULL) {
 535                                 if (strstr(attr, "all_partitions") != NULL) {
 536                                         dbg(rules->udev, "creation of partition nodes requested\n");
 537                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 538                                 }
 539                                 if (strstr(attr, "ignore_remove") != NULL) {
 540                                         dbg(rules->udev, "remove event should be ignored\n");
 541                                         rule->ignore_remove = 1;
 542                                 }
 543                         }
 544                         if (value[0] == '\0')
 545                                 dbg(rules->udev, "name empty, node creation supressed\n");
 546                         add_rule_key(rule, &rule->name, operation, value);
 547                         continue;
 548                 }
 549
 550                 if (strcasecmp(key, "SYMLINK") == 0) {
 551                         if (operation == KEY_OP_MATCH ||
 552                             operation == KEY_OP_NOMATCH)
 553                                 add_rule_key(rule, &rule->symlink_match, operation, value);
 554                         else
 555                                 add_rule_key(rule, &rule->symlink, operation, value);
 556                         valid = 1;
 557                         continue;
 558                 }
 559
 560                 if (strcasecmp(key, "OWNER") == 0) {
 561                         valid = 1;
 562                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 563                                 char *endptr;
 564                                 strtoul(value, &endptr, 10);
 565                                 if (endptr[0] != '\0') {
 566                                         char owner[32];
 567                                         uid_t uid = lookup_user(rules->udev, value);
 568                                         dbg(rules->udev, "replacing username='%s' by id=%i\n", value, uid);
 569                                         sprintf(owner, "%u", (unsigned int) uid);
 570                                         add_rule_key(rule, &rule->owner, operation, owner);
 571                                         continue;
 572                                 }
 573                         }
 574
 575                         add_rule_key(rule, &rule->owner, operation, value);
 576                         continue;
 577                 }
 578
 579                 if (strcasecmp(key, "GROUP") == 0) {
 580                         valid = 1;
 581                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 582                                 char *endptr;
 583                                 strtoul(value, &endptr, 10);
 584                                 if (endptr[0] != '\0') {
 585                                         char group[32];
 586                                         gid_t gid = lookup_group(rules->udev, value);
 587                                         dbg(rules->udev, "replacing groupname='%s' by id=%i\n", value, gid);
 588                                         sprintf(group, "%u", (unsigned int) gid);
 589                                         add_rule_key(rule, &rule->group, operation, group);
 590                                         continue;
 591                                 }
 592                         }
 593
 594                         add_rule_key(rule, &rule->group, operation, value);
 595                         continue;
 596                 }
 597
 598                 if (strcasecmp(key, "MODE") == 0) {
 599                         add_rule_key(rule, &rule->mode, operation, value);
 600                         valid = 1;
 601                         continue;
 602                 }
 603
 604                 if (strcasecmp(key, "OPTIONS") == 0) {
 605                         const char *pos;
 606
 607                         if (strstr(value, "last_rule") != NULL) {
 608                                 dbg(rules->udev, "last rule to be applied\n");
 609                                 rule->last_rule = 1;
 610                         }
 611                         if (strstr(value, "ignore_device") != NULL) {
 612                                 dbg(rules->udev, "device should be ignored\n");
 613                                 rule->ignore_device = 1;
 614                         }
 615                         if (strstr(value, "ignore_remove") != NULL) {
 616                                 dbg(rules->udev, "remove event should be ignored\n");
 617                                 rule->ignore_remove = 1;
 618                         }
 619                         pos = strstr(value, "link_priority=");
 620                         if (pos != NULL) {
 621                                 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 622                                 dbg(rules->udev, "link priority=%i\n", rule->link_priority);
 623                         }
 624                         pos = strstr(value, "event_timeout=");
 625                         if (pos != NULL) {
 626                                 rule->event_timeout = atoi(&pos[strlen("event_timeout=")]);
 627                                 dbg(rules->udev, "event timout=%i\n", rule->event_timeout);
 628                         }
 629                         pos = strstr(value, "string_escape=");
 630                         if (pos != NULL) {
 631                                 pos = &pos[strlen("string_escape=")];
 632                                 if (strncmp(pos, "none", strlen("none")) == 0)
 633                                         rule->string_escape = ESCAPE_NONE;
 634                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
 635                                         rule->string_escape = ESCAPE_REPLACE;
 636                         }
 637                         if (strstr(value, "all_partitions") != NULL) {
 638                                 dbg(rules->udev, "creation of partition nodes requested\n");
 639                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 640                         }
 641                         valid = 1;
 642                         continue;
 643                 }
 644
 645                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
 646         }
 647
 648         if (physdev && rule->wait_for.operation == KEY_OP_UNSET)
 649                 err(rules->udev, "PHYSDEV* values are deprecated and will be removed from a future kernel, \n"
 650                     "please fix it in %s:%u", filename, lineno);
 651
 652         /* skip line if not any valid key was found */
 653         if (!valid)
 654                 goto invalid;
 655
 656         /* grow buffer and add rule */
 657         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 658         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 659         dbg(rules->udev, "add %zi padding bytes\n", padding);
 660         rule_size += padding;
 661         rule->bufsize += padding;
 662
 663         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 664         if (!rules->buf) {
 665                 err(rules->udev, "realloc failed\n");
 666                 goto exit;
 667         }
 668         dbg(rules->udev, "adding rule to offset %zi\n", rules->bufsize);
 669         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 670         rules->bufsize += rule_size;
 671 exit:
 672         return 0;
 673
 674 invalid:
 675         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
 676         return -1;
 677 }
 678
 679 static int parse_file(struct udev_rules *rules, const char *filename)
 680 {
 681         char line[UTIL_LINE_SIZE];
 682         char *bufline;
 683         unsigned int lineno;
 684         char *buf;
 685         size_t bufsize;
 686         size_t cur;
 687         size_t count;
 688         int retval = 0;
 689         size_t start;
 690         struct udev_rule *rule;
 691         struct udev_rules_iter iter;
 692
 693         start = rules->bufsize;
 694
 695         if (file_map(filename, &buf, &bufsize) != 0) {
 696                 err(rules->udev, "can't open '%s' as rules file: %m\n", filename);
 697                 return -1;
 698         }
 699         info(rules->udev, "reading '%s' as rules file\n", filename);
 700
 701         /* loop through the whole file */
 702         cur = 0;
 703         lineno = 0;
 704         while (cur < bufsize) {
 705                 unsigned int i, j;
 706
 707                 count = buf_get_line(buf, bufsize, cur);
 708                 bufline = &buf[cur];
 709                 cur += count+1;
 710                 lineno++;
 711
 712                 /* eat the whitespace */
 713                 while ((count > 0) && isspace(bufline[0])) {
 714                         bufline++;
 715                         count--;
 716                 }
 717                 if (count == 0)
 718                         continue;
 719
 720                 /* see if this is a comment */
 721                 if (bufline[0] == '#')
 722                         continue;
 723
 724                 if (count >= sizeof(line)) {
 725                         err(rules->udev, "line too long, rule skipped '%s:%u'\n", filename, lineno);
 726                         continue;
 727                 }
 728
 729                 /* skip backslash and newline from multiline rules */
 730                 for (i = j = 0; i < count; i++) {
 731                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 732                                 continue;
 733
 734                         line[j++] = bufline[i];
 735                 }
 736                 line[j] = '\0';
 737
 738                 dbg(rules->udev, "read '%s'\n", line);
 739                 add_to_rules(rules, line, filename, lineno);
 740         }
 741
 742         /* Compute all goto targets within this file */
 743         udev_rules_iter_init(&iter, rules);
 744         udev_rules_iter_goto(&iter, start);
 745         while((rule = udev_rules_iter_next(&iter))) {
 746                 if (rule->goto_label.operation != KEY_OP_UNSET) {
 747                         char *goto_label = &rule->buf[rule->goto_label.val_off];
 748
 749                         dbg(rules->udev, "resolving goto label '%s'\n", goto_label);
 750                         rule->goto_rule_off = find_label(&iter, goto_label);
 751                         if (rule->goto_rule_off == 0) {
 752                                 err(rules->udev, "ignore goto to nonexistent label '%s' in '%s'\n",
 753                                     goto_label, filename);
 754                                 rule->goto_rule_off = iter.current;
 755                         }
 756                 }
 757         }
 758
 759         file_unmap(buf, bufsize);
 760         return retval;
 761 }
 762
 763 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
 764 {
 765         struct dirent *ent;
 766         DIR *dir;
 767         char filename[UTIL_PATH_SIZE];
 768
 769         dbg(udev, "open directory '%s'\n", dirname);
 770         dir = opendir(dirname);
 771         if (dir == NULL) {
 772                 err(udev, "unable to open '%s': %m\n", dirname);
 773                 return -1;
 774         }
 775
 776         while (1) {
 777                 ent = readdir(dir);
 778                 if (ent == NULL || ent->d_name[0] == '\0')
 779                         break;
 780
 781                 if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
 782                         continue;
 783
 784                 /* look for file matching with specified suffix */
 785                 if (suffix != NULL) {
 786                         const char *ext;
 787
 788                         ext = strrchr(ent->d_name, '.');
 789                         if (ext == NULL)
 790                                 continue;
 791                         if (strcmp(ext, suffix) != 0)
 792                                 continue;
 793                 }
 794                 dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
 795
 796                 snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
 797                 filename[sizeof(filename)-1] = '\0';
 798                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
 799         }
 800
 801         closedir(dir);
 802         return 0;
 803 }
 804
 805 int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_names)
 806 {
 807         struct stat statbuf;
 808         char filename[PATH_MAX];
 809         struct udev_list_node file_list;
 810         struct udev_list_entry *file_loop, *file_tmp;
 811         int retval = 0;
 812
 813         memset(rules, 0x00, sizeof(struct udev_rules));
 814         rules->udev = udev;
 815         rules->resolve_names = resolve_names;
 816         udev_list_init(&file_list);
 817
 818         if (udev_get_rules_path(udev) != NULL) {
 819                 /* custom rules location for testing */
 820                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
 821         } else {
 822                 struct udev_list_node sort_list;
 823                 struct udev_list_entry *sort_loop, *sort_tmp;
 824
 825                 /* read user/custom rules */
 826                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
 827
 828                 /* read dynamic/temporary rules */
 829                 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
 830                 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
 831                 if (stat(filename, &statbuf) != 0) {
 832                         create_path(udev, filename);
 833                         udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
 834                         mkdir(filename, 0755);
 835                         udev_selinux_resetfscreatecon(udev);
 836                 }
 837                 udev_list_init(&sort_list);
 838                 add_matching_files(udev, &sort_list, filename, ".rules");
 839
 840                 /* read default rules */
 841                 add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/rules.d", ".rules");
 842
 843                 /* sort all rules files by basename into list of files */
 844                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
 845                         const char *sort_name = udev_list_entry_get_name(sort_loop);
 846                         const char *sort_base = strrchr(sort_name, '/');
 847
 848                         if (sort_base == NULL)
 849                                 continue;
 850
 851                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
 852                                 const char *file_name = udev_list_entry_get_name(file_loop);
 853                                 const char *file_base = strrchr(file_name, '/');
 854
 855                                 if (file_base == NULL)
 856                                         continue;
 857                                 if (strcmp(file_base, sort_base) == 0) {
 858                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
 859                                              file_name, sort_name);
 860                                         udev_list_entry_remove(sort_loop);
 861                                         sort_loop = NULL;
 862                                         break;
 863                                 }
 864                                 if (strcmp(file_base, sort_base) > 0)
 865                                         break;
 866                         }
 867                         if (sort_loop != NULL)
 868                                 udev_list_entry_move_before(sort_loop, file_loop);
 869                 }
 870         }
 871
 872         /* parse list of files */
 873         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
 874                 const char *file_name = udev_list_entry_get_name(file_loop);
 875
 876                 if (stat(file_name, &statbuf) == 0 && statbuf.st_size > 0)
 877                         parse_file(rules, file_name);
 878                 else
 879                         info(udev, "can not read '%s'\n", file_name);
 880                 udev_list_entry_remove(file_loop);
 881         }
 882         return retval;
 883 }
 884
 885 void udev_rules_cleanup(struct udev_rules *rules)
 886 {
 887         if (rules->buf) {
 888                 free(rules->buf);
 889                 rules->buf = NULL;
 890         }
 891 }
 892