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, "match:\n");
 143         } else if (linepos[0] == '!' && linepos[1] == '=') {
 144                 *operation = KEY_OP_NOMATCH;
 145                 linepos += 2;
 146                 dbg(rules->udev, "nomatch:\n");
 147         } else if (linepos[0] == '+' && linepos[1] == '=') {
 148                 *operation = KEY_OP_ADD;
 149                 linepos += 2;
 150                 dbg(rules->udev, "add:\n");
 151         } else if (linepos[0] == '=') {
 152                 *operation = KEY_OP_ASSIGN;
 153                 linepos++;
 154                 dbg(rules->udev, "assign:\n");
 155         } else if (linepos[0] == ':' && linepos[1] == '=') {
 156                 *operation = KEY_OP_ASSIGN_FINAL;
 157                 linepos += 2;
 158                 dbg(rules->udev, "assign_final:\n");
 159         } else
 160                 return -1;
 161
 162         /* terminate key */
 163         temp[0] = '\0';
 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, "'%s'-'%s'\n", *key, *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         FILE *f;
 681         char line[UTIL_LINE_SIZE];
 682         size_t start;
 683         struct udev_rule *rule;
 684         struct udev_rules_iter iter;
 685
 686         start = rules->bufsize;
 687         info(rules->udev, "reading '%s' as rules file\n", filename);
 688
 689         f = fopen(filename, "r");
 690         if (f == NULL)
 691                 return -1;
 692
 693         while(fgets(line, sizeof(line), f) != NULL) {
 694                 int line_nr = 0;
 695                 char *key;
 696                 size_t len;
 697
 698                 /* skip whitespace */
 699                 line_nr++;
 700                 key = line;
 701                 while (isspace(key[0]))
 702                         key++;
 703
 704                 /* comment */
 705                 if (key[0] == '#')
 706                         continue;
 707
 708                 len = strlen(line);
 709                 if (len < 3)
 710                         continue;
 711
 712                 /* continue reading if backslash+newline is found */
 713                 while (line[len-2] == '\\') {
 714                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
 715                                 break;
 716                         line_nr++;
 717                         len = strlen(line);
 718                 }
 719
 720                 if (len+1 >= sizeof(line)) {
 721                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
 722                         continue;
 723                 }
 724                 add_to_rules(rules, key, filename, line_nr);
 725         }
 726         fclose(f);
 727
 728         /* compute all goto targets within this file */
 729         udev_rules_iter_init(&iter, rules);
 730         udev_rules_iter_goto(&iter, start);
 731         while((rule = udev_rules_iter_next(&iter))) {
 732                 if (rule->goto_label.operation != KEY_OP_UNSET) {
 733                         char *goto_label = &rule->buf[rule->goto_label.val_off];
 734
 735                         dbg(rules->udev, "resolving goto label '%s'\n", goto_label);
 736                         rule->goto_rule_off = find_label(&iter, goto_label);
 737                         if (rule->goto_rule_off == 0) {
 738                                 err(rules->udev, "ignore goto to nonexistent label '%s' in '%s'\n",
 739                                     goto_label, filename);
 740                                 rule->goto_rule_off = iter.current;
 741                         }
 742                 }
 743         }
 744         return 0;
 745 }
 746
 747 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
 748 {
 749         struct dirent *ent;
 750         DIR *dir;
 751         char filename[UTIL_PATH_SIZE];
 752
 753         dbg(udev, "open directory '%s'\n", dirname);
 754         dir = opendir(dirname);
 755         if (dir == NULL) {
 756                 err(udev, "unable to open '%s': %m\n", dirname);
 757                 return -1;
 758         }
 759
 760         while (1) {
 761                 ent = readdir(dir);
 762                 if (ent == NULL || ent->d_name[0] == '\0')
 763                         break;
 764
 765                 if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
 766                         continue;
 767
 768                 /* look for file matching with specified suffix */
 769                 if (suffix != NULL) {
 770                         const char *ext;
 771
 772                         ext = strrchr(ent->d_name, '.');
 773                         if (ext == NULL)
 774                                 continue;
 775                         if (strcmp(ext, suffix) != 0)
 776                                 continue;
 777                 }
 778                 dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
 779
 780                 snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
 781                 filename[sizeof(filename)-1] = '\0';
 782                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
 783         }
 784
 785         closedir(dir);
 786         return 0;
 787 }
 788
 789 int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_names)
 790 {
 791         struct stat statbuf;
 792         char filename[PATH_MAX];
 793         struct udev_list_node file_list;
 794         struct udev_list_entry *file_loop, *file_tmp;
 795         int retval = 0;
 796
 797         memset(rules, 0x00, sizeof(struct udev_rules));
 798         rules->udev = udev;
 799         rules->resolve_names = resolve_names;
 800         udev_list_init(&file_list);
 801
 802         if (udev_get_rules_path(udev) != NULL) {
 803                 /* custom rules location for testing */
 804                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
 805         } else {
 806                 struct udev_list_node sort_list;
 807                 struct udev_list_entry *sort_loop, *sort_tmp;
 808
 809                 /* read user/custom rules */
 810                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
 811
 812                 /* read dynamic/temporary rules */
 813                 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
 814                 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
 815                 if (stat(filename, &statbuf) != 0) {
 816                         create_path(udev, filename);
 817                         udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
 818                         mkdir(filename, 0755);
 819                         udev_selinux_resetfscreatecon(udev);
 820                 }
 821                 udev_list_init(&sort_list);
 822                 add_matching_files(udev, &sort_list, filename, ".rules");
 823
 824                 /* read default rules */
 825                 add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/rules.d", ".rules");
 826
 827                 /* sort all rules files by basename into list of files */
 828                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
 829                         const char *sort_name = udev_list_entry_get_name(sort_loop);
 830                         const char *sort_base = strrchr(sort_name, '/');
 831
 832                         if (sort_base == NULL)
 833                                 continue;
 834
 835                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
 836                                 const char *file_name = udev_list_entry_get_name(file_loop);
 837                                 const char *file_base = strrchr(file_name, '/');
 838
 839                                 if (file_base == NULL)
 840                                         continue;
 841                                 if (strcmp(file_base, sort_base) == 0) {
 842                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
 843                                              file_name, sort_name);
 844                                         udev_list_entry_remove(sort_loop);
 845                                         sort_loop = NULL;
 846                                         break;
 847                                 }
 848                                 if (strcmp(file_base, sort_base) > 0)
 849                                         break;
 850                         }
 851                         if (sort_loop != NULL)
 852                                 udev_list_entry_move_before(sort_loop, file_loop);
 853                 }
 854         }
 855
 856         /* parse list of files */
 857         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
 858                 const char *file_name = udev_list_entry_get_name(file_loop);
 859
 860                 if (stat(file_name, &statbuf) == 0 && statbuf.st_size > 0)
 861                         parse_file(rules, file_name);
 862                 else
 863                         info(udev, "can not read '%s'\n", file_name);
 864                 udev_list_entry_remove(file_loop);
 865         }
 866         return retval;
 867 }
 868
 869 void udev_rules_cleanup(struct udev_rules *rules)
 870 {
 871         if (rules->buf) {
 872                 free(rules->buf);
 873                 rules->buf = NULL;
 874         }
 875 }
 876