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