udev_rules_parse.c

   1 /*
   2  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <ctype.h>
  25 #include <unistd.h>
  26 #include <sys/stat.h>
  27 #include <errno.h>
  28
  29 #include "udev.h"
  30 #include "udev_rules.h"
  31 #include "udev_selinux.h"
  32
  33
  34 void udev_rules_iter_init(struct udev_rules *rules)
  35 {
  36         dbg("bufsize=%zi", rules->bufsize);
  37         rules->current = 0;
  38 }
  39
  40 struct udev_rule *udev_rules_iter_next(struct udev_rules *rules)
  41 {
  42         static struct udev_rule *rule;
  43
  44         if (!rules)
  45                 return NULL;
  46
  47         dbg("current=%zi", rules->current);
  48         if (rules->current >= rules->bufsize) {
  49                 dbg("no more rules");
  50                 return NULL;
  51         }
  52
  53         /* get next rule */
  54         rule = (struct udev_rule *) (rules->buf + rules->current);
  55         rules->current += sizeof(struct udev_rule) + rule->bufsize;
  56
  57         return rule;
  58 }
  59
  60 struct udev_rule *udev_rules_iter_label(struct udev_rules *rules, const char *label)
  61 {
  62         static struct udev_rule *rule;
  63
  64 next:
  65         dbg("current=%zi", rules->current);
  66         if (rules->current >= rules->bufsize) {
  67                 dbg("no more rules");
  68                 return NULL;
  69         }
  70         rule = (struct udev_rule *) (rules->buf + rules->current);
  71
  72         if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
  73                 dbg("moving forward, looking for label '%s'", label);
  74                 rules->current += sizeof(struct udev_rule) + rule->bufsize;
  75                 goto next;
  76         }
  77
  78         dbg("found label '%s'", label);
  79         return rule;
  80 }
  81
  82 static int get_key(char **line, char **key, enum key_operation *operation, char **value)
  83 {
  84         char *linepos;
  85         char *temp;
  86
  87         linepos = *line;
  88         if (linepos == NULL && linepos[0] == '\0')
  89                 return -1;
  90
  91         /* skip whitespace */
  92         while (isspace(linepos[0]) || linepos[0] == ',')
  93                 linepos++;
  94
  95         /* get the key */
  96         if (linepos[0] == '\0')
  97                 return -1;
  98         *key = linepos;
  99
 100         while (1) {
 101                 linepos++;
 102                 if (linepos[0] == '\0')
 103                         return -1;
 104                 if (isspace(linepos[0]))
 105                         break;
 106                 if (linepos[0] == '=')
 107                         break;
 108                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 109                         if (linepos[1] == '=')
 110                                 break;
 111         }
 112
 113         /* remember end of key */
 114         temp = linepos;
 115
 116         /* skip whitespace after key */
 117         while (isspace(linepos[0]))
 118                 linepos++;
 119         if (linepos[0] == '\0')
 120                 return -1;
 121
 122         /* get operation type */
 123         if (linepos[0] == '=' && linepos[1] == '=') {
 124                 *operation = KEY_OP_MATCH;
 125                 linepos += 2;
 126                 dbg("operator=match");
 127         } else if (linepos[0] == '!' && linepos[1] == '=') {
 128                 *operation = KEY_OP_NOMATCH;
 129                 linepos += 2;
 130                 dbg("operator=nomatch");
 131         } else if (linepos[0] == '+' && linepos[1] == '=') {
 132                 *operation = KEY_OP_ADD;
 133                 linepos += 2;
 134                 dbg("operator=add");
 135         } else if (linepos[0] == '=') {
 136                 *operation = KEY_OP_ASSIGN;
 137                 linepos++;
 138                 dbg("operator=assign");
 139         } else if (linepos[0] == ':' && linepos[1] == '=') {
 140                 *operation = KEY_OP_ASSIGN_FINAL;
 141                 linepos += 2;
 142                 dbg("operator=assign_final");
 143         } else
 144                 return -1;
 145
 146         /* terminate key */
 147         temp[0] = '\0';
 148         dbg("key='%s'", *key);
 149
 150         /* skip whitespace after operator */
 151         while (isspace(linepos[0]))
 152                 linepos++;
 153         if (linepos[0] == '\0')
 154                 return -1;
 155
 156         /* get the value*/
 157         if (linepos[0] == '"')
 158                 linepos++;
 159         else
 160                 return -1;
 161         *value = linepos;
 162
 163         temp = strchr(linepos, '"');
 164         if (!temp)
 165                 return -1;
 166         temp[0] = '\0';
 167         temp++;
 168         dbg("value='%s'", *value);
 169
 170         /* move line to next key */
 171         *line = temp;
 172
 173         return 0;
 174 }
 175
 176 /* extract possible KEY{attr} */
 177 static char *get_key_attribute(char *str)
 178 {
 179         char *pos;
 180         char *attr;
 181
 182         attr = strchr(str, '{');
 183         if (attr != NULL) {
 184                 attr++;
 185                 pos = strchr(attr, '}');
 186                 if (pos == NULL) {
 187                         err("missing closing brace for format");
 188                         return NULL;
 189                 }
 190                 pos[0] = '\0';
 191                 dbg("attribute='%s'", attr);
 192                 return attr;
 193         }
 194
 195         return NULL;
 196 }
 197
 198 static int add_rule_key(struct udev_rule *rule, struct key *key,
 199                         enum key_operation operation, const char *value)
 200 {
 201         size_t val_len = strnlen(value, PATH_SIZE);
 202
 203         key->operation = operation;
 204
 205         key->val_off = rule->bufsize;
 206         strlcpy(rule->buf + rule->bufsize, value, val_len+1);
 207         rule->bufsize += val_len+1;
 208
 209         return 0;
 210 }
 211
 212 static int add_rule_key_pair(struct udev_rule *rule, struct key_pairs *pairs,
 213                              enum key_operation operation, const char *key, const char *value)
 214 {
 215         size_t key_len = strnlen(key, PATH_SIZE);
 216
 217         if (pairs->count >= PAIRS_MAX) {
 218                 err("skip, too many keys of the same type in a single rule");
 219                 return -1;
 220         }
 221
 222         add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
 223
 224         /* add the key-name of the pair */
 225         pairs->keys[pairs->count].key_name_off = rule->bufsize;
 226         strlcpy(rule->buf + rule->bufsize, key, key_len+1);
 227         rule->bufsize += key_len+1;
 228
 229         pairs->count++;
 230
 231         return 0;
 232 }
 233
 234 static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
 235 {
 236         char buf[sizeof(struct udev_rule) + LINE_SIZE];
 237         struct udev_rule *rule;
 238         size_t rule_size;
 239         int valid;
 240         char *linepos;
 241         char *attr;
 242         size_t padding;
 243         int physdev = 0;
 244         int retval;
 245
 246         memset(buf, 0x00, sizeof(buf));
 247         rule = (struct udev_rule *) buf;
 248         linepos = line;
 249         valid = 0;
 250
 251         /* get all the keys */
 252         while (1) {
 253                 char *key;
 254                 char *value;
 255                 enum key_operation operation = KEY_OP_UNSET;
 256
 257                 retval = get_key(&linepos, &key, &operation, &value);
 258                 if (retval)
 259                         break;
 260
 261                 if (strcasecmp(key, "ACTION") == 0) {
 262                         if (operation != KEY_OP_MATCH &&
 263                             operation != KEY_OP_NOMATCH) {
 264                                 err("invalid ACTION operation");
 265                                 goto invalid;
 266                         }
 267                         add_rule_key(rule, &rule->action, operation, value);
 268                         valid = 1;
 269                         continue;
 270                 }
 271
 272                 if (strcasecmp(key, "DEVPATH") == 0) {
 273                         if (operation != KEY_OP_MATCH &&
 274                             operation != KEY_OP_NOMATCH) {
 275                                 err("invalid DEVPATH operation");
 276                                 goto invalid;
 277                         }
 278                         add_rule_key(rule, &rule->devpath, operation, value);
 279                         valid = 1;
 280                         continue;
 281                 }
 282
 283                 if (strcasecmp(key, "KERNEL") == 0) {
 284                         if (operation != KEY_OP_MATCH &&
 285                             operation != KEY_OP_NOMATCH) {
 286                                 err("invalid KERNEL operation");
 287                                 goto invalid;
 288                         }
 289                         add_rule_key(rule, &rule->kernel, operation, value);
 290                         valid = 1;
 291                         continue;
 292                 }
 293
 294                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
 295                         if (operation != KEY_OP_MATCH &&
 296                             operation != KEY_OP_NOMATCH) {
 297                                 err("invalid SUBSYSTEM operation");
 298                                 goto invalid;
 299                         }
 300                         /* bus, class, subsystem events should all be the same */
 301                         if (strcmp(value, "subsystem") == 0 ||
 302                             strcmp(value, "bus") == 0 ||
 303                             strcmp(value, "class") == 0) {
 304                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
 305                                         err("'%s' must be specified as 'subsystem' "
 306                                             "please fix it in %s:%u", value, filename, lineno);
 307                                 add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
 308                         } else
 309                                 add_rule_key(rule, &rule->subsystem, operation, value);
 310                         valid = 1;
 311                         continue;
 312                 }
 313
 314                 if (strcasecmp(key, "DRIVER") == 0) {
 315                         if (operation != KEY_OP_MATCH &&
 316                             operation != KEY_OP_NOMATCH) {
 317                                 err("invalid DRIVER operation");
 318                                 goto invalid;
 319                         }
 320                         add_rule_key(rule, &rule->driver, operation, value);
 321                         valid = 1;
 322                         continue;
 323                 }
 324
 325                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
 326                         attr = get_key_attribute(key + sizeof("ATTR")-1);
 327                         if (attr == NULL) {
 328                                 err("error parsing ATTR attribute");
 329                                 goto invalid;
 330                         }
 331                         if (add_rule_key_pair(rule, &rule->attr, operation, attr, value) != 0)
 332                                 goto invalid;
 333                         valid = 1;
 334                         continue;
 335                 }
 336
 337                 if (strcasecmp(key, "KERNELS") == 0 ||
 338                     strcasecmp(key, "ID") == 0) {
 339                         if (operation != KEY_OP_MATCH &&
 340                             operation != KEY_OP_NOMATCH) {
 341                                 err("invalid KERNELS operation");
 342                                 goto invalid;
 343                         }
 344                         add_rule_key(rule, &rule->kernels, operation, value);
 345                         valid = 1;
 346                         continue;
 347                 }
 348
 349                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
 350                     strcasecmp(key, "BUS") == 0) {
 351                         if (operation != KEY_OP_MATCH &&
 352                             operation != KEY_OP_NOMATCH) {
 353                                 err("invalid SUBSYSTEMS operation");
 354                                 goto invalid;
 355                         }
 356                         add_rule_key(rule, &rule->subsystems, operation, value);
 357                         valid = 1;
 358                         continue;
 359                 }
 360
 361                 if (strcasecmp(key, "DRIVERS") == 0) {
 362                         if (operation != KEY_OP_MATCH &&
 363                             operation != KEY_OP_NOMATCH) {
 364                                 err("invalid DRIVERS operation");
 365                                 goto invalid;
 366                         }
 367                         add_rule_key(rule, &rule->drivers, operation, value);
 368                         valid = 1;
 369                         continue;
 370                 }
 371
 372                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
 373                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
 374                         if (operation != KEY_OP_MATCH &&
 375                             operation != KEY_OP_NOMATCH) {
 376                                 err("invalid ATTRS operation");
 377                                 goto invalid;
 378                         }
 379                         attr = get_key_attribute(key + sizeof("ATTRS")-1);
 380                         if (attr == NULL) {
 381                                 err("error parsing ATTRS attribute");
 382                                 goto invalid;
 383                         }
 384                         if (strncmp(attr, "device/", 7) == 0)
 385                                 err("the 'device' link is deprecated and will be removed from a future kernel, "
 386                                     "please fix it in %s:%u", filename, lineno);
 387                         else if (strstr(attr, "../") != NULL)
 388                                 err("do not reference parent sysfs directories directly, that may break with a future kernel, "
 389                                     "please fix it in %s:%u", filename, lineno);
 390                         if (add_rule_key_pair(rule, &rule->attrs, operation, attr, value) != 0)
 391                                 goto invalid;
 392                         valid = 1;
 393                         continue;
 394                 }
 395
 396                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
 397                         attr = get_key_attribute(key + sizeof("ENV")-1);
 398                         if (attr == NULL) {
 399                                 err("error parsing ENV attribute");
 400                                 goto invalid;
 401                         }
 402                         if (strncmp(attr, "PHYSDEV", 7) == 0)
 403                                 physdev = 1;
 404                         if (add_rule_key_pair(rule, &rule->env, operation, attr, value) != 0)
 405                                 goto invalid;
 406                         valid = 1;
 407                         continue;
 408                 }
 409
 410                 if (strcasecmp(key, "PROGRAM") == 0) {
 411                         add_rule_key(rule, &rule->program, operation, value);
 412                         valid = 1;
 413                         continue;
 414                 }
 415
 416                 if (strcasecmp(key, "RESULT") == 0) {
 417                         if (operation != KEY_OP_MATCH &&
 418                             operation != KEY_OP_NOMATCH) {
 419                                 err("invalid RESULT operation");
 420                                 goto invalid;
 421                         }
 422                         add_rule_key(rule, &rule->result, operation, value);
 423                         valid = 1;
 424                         continue;
 425                 }
 426
 427                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
 428                         attr = get_key_attribute(key + sizeof("IMPORT")-1);
 429                         if (attr != NULL && strstr(attr, "program")) {
 430                                 dbg("IMPORT will be executed");
 431                                 rule->import_type  = IMPORT_PROGRAM;
 432                         } else if (attr != NULL && strstr(attr, "file")) {
 433                                 dbg("IMPORT will be included as file");
 434                                 rule->import_type  = IMPORT_FILE;
 435                         } else if (attr != NULL && strstr(attr, "parent")) {
 436                                 dbg("IMPORT will include the parent values");
 437                                 rule->import_type = IMPORT_PARENT;
 438                         } else {
 439                                 /* figure it out if it is executable */
 440                                 char file[PATH_SIZE];
 441                                 char *pos;
 442                                 struct stat statbuf;
 443
 444                                 strlcpy(file, value, sizeof(file));
 445                                 pos = strchr(file, ' ');
 446                                 if (pos)
 447                                         pos[0] = '\0';
 448
 449                                 /* allow programs in /lib/udev called without the path */
 450                                 if (strchr(file, '/') == NULL) {
 451                                         strlcpy(file, "/lib/udev/", sizeof(file));
 452                                         strlcat(file, value, sizeof(file));
 453                                         pos = strchr(file, ' ');
 454                                         if (pos)
 455                                                 pos[0] = '\0';
 456                                 }
 457
 458                                 dbg("IMPORT auto mode for '%s'", file);
 459                                 if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
 460                                         dbg("IMPORT is executable, will be executed (autotype)");
 461                                         rule->import_type  = IMPORT_PROGRAM;
 462                                 } else {
 463                                         dbg("IMPORT is not executable, will be included as file (autotype)");
 464                                         rule->import_type  = IMPORT_FILE;
 465                                 }
 466                         }
 467                         add_rule_key(rule, &rule->import, operation, value);
 468                         valid = 1;
 469                         continue;
 470                 }
 471
 472                 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
 473                         if (operation != KEY_OP_MATCH &&
 474                             operation != KEY_OP_NOMATCH) {
 475                                 err("invalid TEST operation");
 476                                 goto invalid;
 477                         }
 478                         attr = get_key_attribute(key + sizeof("TEST")-1);
 479                         if (attr != NULL)
 480                                 rule->test_mode_mask = strtol(attr, NULL, 8);
 481                         add_rule_key(rule, &rule->test, operation, value);
 482                         valid = 1;
 483                         continue;
 484                 }
 485
 486                 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
 487                         attr = get_key_attribute(key + sizeof("RUN")-1);
 488                         if (attr != NULL) {
 489                                 if (strstr(attr, "ignore_error"))
 490                                         rule->run_ignore_error = 1;
 491                         }
 492                         add_rule_key(rule, &rule->run, operation, value);
 493                         valid = 1;
 494                         continue;
 495                 }
 496
 497                 if (strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
 498                         add_rule_key(rule, &rule->wait_for_sysfs, operation, value);
 499                         valid = 1;
 500                         continue;
 501                 }
 502
 503                 if (strcasecmp(key, "LABEL") == 0) {
 504                         add_rule_key(rule, &rule->label, operation, value);
 505                         valid = 1;
 506                         continue;
 507                 }
 508
 509                 if (strcasecmp(key, "GOTO") == 0) {
 510                         add_rule_key(rule, &rule->goto_label, operation, value);
 511                         valid = 1;
 512                         continue;
 513                 }
 514
 515                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
 516                         attr = get_key_attribute(key + sizeof("NAME")-1);
 517                         if (attr != NULL) {
 518                                 if (strstr(attr, "all_partitions") != NULL) {
 519                                         dbg("creation of partition nodes requested");
 520                                         rule->partitions = DEFAULT_PARTITIONS_COUNT;
 521                                 }
 522                                 if (strstr(attr, "ignore_remove") != NULL) {
 523                                         dbg("remove event should be ignored");
 524                                         rule->ignore_remove = 1;
 525                                 }
 526                         }
 527                         if (value[0] == '\0')
 528                                 dbg("name empty, node creation supressed");
 529                         add_rule_key(rule, &rule->name, operation, value);
 530                         continue;
 531                 }
 532
 533                 if (strcasecmp(key, "SYMLINK") == 0) {
 534                         if (operation == KEY_OP_MATCH ||
 535                             operation == KEY_OP_NOMATCH)
 536                                 add_rule_key(rule, &rule->symlink_match, operation, value);
 537                         else
 538                                 add_rule_key(rule, &rule->symlink, operation, value);
 539                         valid = 1;
 540                         continue;
 541                 }
 542
 543                 if (strcasecmp(key, "OWNER") == 0) {
 544                         valid = 1;
 545                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 546                                 char *endptr;
 547                                 strtoul(value, &endptr, 10);
 548                                 if (endptr[0] != '\0') {
 549                                         char owner[32];
 550                                         uid_t uid = lookup_user(value);
 551                                         dbg("replacing username='%s' by id=%i", value, uid);
 552                                         sprintf(owner, "%u", (unsigned int) uid);
 553                                         add_rule_key(rule, &rule->owner, operation, owner);
 554                                         continue;
 555                                 }
 556                         }
 557
 558                         add_rule_key(rule, &rule->owner, operation, value);
 559                         continue;
 560                 }
 561
 562                 if (strcasecmp(key, "GROUP") == 0) {
 563                         valid = 1;
 564                         if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
 565                                 char *endptr;
 566                                 strtoul(value, &endptr, 10);
 567                                 if (endptr[0] != '\0') {
 568                                         char group[32];
 569                                         gid_t gid = lookup_group(value);
 570                                         dbg("replacing groupname='%s' by id=%i", value, gid);
 571                                         sprintf(group, "%u", (unsigned int) gid);
 572                                         add_rule_key(rule, &rule->group, operation, group);
 573                                         continue;
 574                                 }
 575                         }
 576
 577                         add_rule_key(rule, &rule->group, operation, value);
 578                         continue;
 579                 }
 580
 581                 if (strcasecmp(key, "MODE") == 0) {
 582                         rule->mode = strtol(value, NULL, 8);
 583                         rule->mode_operation = operation;
 584                         valid = 1;
 585                         continue;
 586                 }
 587
 588                 if (strcasecmp(key, "OPTIONS") == 0) {
 589                         const char *pos;
 590
 591                         if (strstr(value, "last_rule") != NULL) {
 592                                 dbg("last rule to be applied");
 593                                 rule->last_rule = 1;
 594                         }
 595                         if (strstr(value, "ignore_device") != NULL) {
 596                                 dbg("device should be ignored");
 597                                 rule->ignore_device = 1;
 598                         }
 599                         if (strstr(value, "ignore_remove") != NULL) {
 600                                 dbg("remove event should be ignored");
 601                                 rule->ignore_remove = 1;
 602                         }
 603                         pos = strstr(value, "link_priority=");
 604                         if (pos != NULL) {
 605                                 rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 606                                 dbg("link priority=%i", rule->link_priority);
 607                         }
 608                         pos = strstr(value, "string_escape=");
 609                         if (pos != NULL) {
 610                                 pos = &pos[strlen("string_escape=")];
 611                                 if (strncmp(pos, "none", strlen("none")) == 0)
 612                                         rule->string_escape = ESCAPE_NONE;
 613                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
 614                                         rule->string_escape = ESCAPE_REPLACE;
 615                         }
 616                         if (strstr(value, "all_partitions") != NULL) {
 617                                 dbg("creation of partition nodes requested");
 618                                 rule->partitions = DEFAULT_PARTITIONS_COUNT;
 619                         }
 620                         valid = 1;
 621                         continue;
 622                 }
 623
 624                 err("unknown key '%s' in %s:%u", key, filename, lineno);
 625         }
 626
 627         if (physdev && rule->wait_for_sysfs.operation == KEY_OP_UNSET)
 628                 err("PHYSDEV* values are deprecated and will be removed from a future kernel, "
 629                     "please fix it in %s:%u", filename, lineno);
 630
 631         /* skip line if not any valid key was found */
 632         if (!valid)
 633                 goto invalid;
 634
 635         /* grow buffer and add rule */
 636         rule_size = sizeof(struct udev_rule) + rule->bufsize;
 637         padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
 638         dbg("add %zi padding bytes", padding);
 639         rule_size += padding;
 640         rule->bufsize += padding;
 641
 642         rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
 643         if (!rules->buf) {
 644                 err("realloc failed");
 645                 goto exit;
 646         }
 647         dbg("adding rule to offset %zi", rules->bufsize);
 648         memcpy(rules->buf + rules->bufsize, rule, rule_size);
 649         rules->bufsize += rule_size;
 650 exit:
 651         return 0;
 652
 653 invalid:
 654         err("invalid rule '%s:%u'", filename, lineno);
 655         return -1;
 656 }
 657
 658 static int parse_file(struct udev_rules *rules, const char *filename)
 659 {
 660         char line[LINE_SIZE];
 661         char *bufline;
 662         unsigned int lineno;
 663         char *buf;
 664         size_t bufsize;
 665         size_t cur;
 666         size_t count;
 667         int retval = 0;
 668
 669         if (file_map(filename, &buf, &bufsize) != 0) {
 670                 err("can't open '%s' as rules file: %s", filename, strerror(errno));
 671                 return -1;
 672         }
 673         info("reading '%s' as rules file", filename);
 674
 675         /* loop through the whole file */
 676         cur = 0;
 677         lineno = 0;
 678         while (cur < bufsize) {
 679                 unsigned int i, j;
 680
 681                 count = buf_get_line(buf, bufsize, cur);
 682                 bufline = &buf[cur];
 683                 cur += count+1;
 684                 lineno++;
 685
 686                 /* eat the whitespace */
 687                 while ((count > 0) && isspace(bufline[0])) {
 688                         bufline++;
 689                         count--;
 690                 }
 691                 if (count == 0)
 692                         continue;
 693
 694                 /* see if this is a comment */
 695                 if (bufline[0] == COMMENT_CHARACTER)
 696                         continue;
 697
 698                 if (count >= sizeof(line)) {
 699                         err("line too long, rule skipped '%s:%u'", filename, lineno);
 700                         continue;
 701                 }
 702
 703                 /* skip backslash and newline from multiline rules */
 704                 for (i = j = 0; i < count; i++) {
 705                         if (bufline[i] == '\\' && bufline[i+1] == '\n')
 706                                 continue;
 707
 708                         line[j++] = bufline[i];
 709                 }
 710                 line[j] = '\0';
 711
 712                 dbg("read '%s'", line);
 713                 add_to_rules(rules, line, filename, lineno);
 714         }
 715
 716         file_unmap(buf, bufsize);
 717         return retval;
 718 }
 719
 720 int udev_rules_init(struct udev_rules *rules, int resolve_names)
 721 {
 722         struct stat statbuf;
 723         char filename[PATH_MAX];
 724         LIST_HEAD(name_list);
 725         LIST_HEAD(dyn_list);
 726         struct name_entry *name_loop, *name_tmp;
 727         struct name_entry *dyn_loop, *dyn_tmp;
 728         int retval = 0;
 729
 730         memset(rules, 0x00, sizeof(struct udev_rules));
 731         rules->resolve_names = resolve_names;
 732
 733         /* read main config from single file or all files in a directory */
 734         if (stat(udev_rules_dir, &statbuf) != 0)
 735                 return -1;
 736         if ((statbuf.st_mode & S_IFMT) != S_IFDIR) {
 737                 dbg("parse single rules file '%s'", udev_rules_dir);
 738                 name_list_add(&name_list, udev_rules_dir, 1);
 739         } else {
 740                 dbg("parse rules directory '%s'", udev_rules_dir);
 741                 retval = add_matching_files(&name_list, udev_rules_dir, RULESFILE_SUFFIX);
 742         }
 743
 744         /* read dynamic rules directory */
 745         strlcpy(filename, udev_root, sizeof(filename));
 746         strlcat(filename, "/"RULES_DYN_DIR, sizeof(filename));
 747         if (stat(filename, &statbuf) != 0) {
 748                 create_path(filename);
 749                 selinux_setfscreatecon(filename, NULL, S_IFDIR|0755);
 750                 mkdir(filename, 0755);
 751                 selinux_resetfscreatecon();
 752         }
 753         add_matching_files(&dyn_list, filename, RULESFILE_SUFFIX);
 754
 755         /* sort dynamic rules files by basename into list of files */
 756         list_for_each_entry_safe(dyn_loop, dyn_tmp, &dyn_list, node) {
 757                 const char *dyn_base = strrchr(dyn_loop->name, '/');
 758
 759                 if (dyn_base == NULL)
 760                         continue;
 761
 762                 list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 763                         const char *name_base = strrchr(name_loop->name, '/');
 764
 765                         if (name_base == NULL)
 766                                 continue;
 767
 768                         if (strcmp(name_base, dyn_base) > 0)
 769                                 break;
 770                 }
 771                 list_move_tail(&dyn_loop->node, &name_loop->node);
 772         }
 773
 774         /* parse list of files */
 775         list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
 776                 if (stat(name_loop->name, &statbuf) == 0) {
 777                         if (statbuf.st_size)
 778                                 parse_file(rules, name_loop->name);
 779                         else
 780                                 dbg("empty rules file '%s'", name_loop->name);
 781                 } else
 782                         err("could not read '%s': %s", name_loop->name, strerror(errno));
 783                 list_del(&name_loop->node);
 784                 free(name_loop);
 785         }
 786
 787         return retval;
 788 }
 789
 790 void udev_rules_cleanup(struct udev_rules *rules)
 791 {
 792         if (rules->buf) {
 793                 free(rules->buf);
 794                 rules->buf = NULL;
 795         }
 796 }
 797