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