udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stddef.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <fcntl.h>
  23 #include <ctype.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <dirent.h>
  27 #include <fnmatch.h>
  28
  29 #include "udev.h"
  30
  31 #define PREALLOC_TOKEN                  2048
  32 #define PREALLOC_STRBUF                 32 * 1024
  33
  34 struct uid_gid {
  35         unsigned int name_off;
  36         union {
  37                 uid_t   uid;
  38                 gid_t   gid;
  39         };
  40 };
  41
  42 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  43 struct udev_rules {
  44         struct udev *udev;
  45         int resolve_names;
  46
  47         /* every key in the rules file becomes a token */
  48         struct token *tokens;
  49         unsigned int token_cur;
  50         unsigned int token_max;
  51
  52         /* all key strings are copied to a single string buffer */
  53         char *buf;
  54         size_t buf_cur;
  55         size_t buf_max;
  56         unsigned int buf_count;
  57
  58         /* during rule parsing, we cache uid/gid lookup results */
  59         struct uid_gid *uids;
  60         unsigned int uids_cur;
  61         unsigned int uids_max;
  62         struct uid_gid *gids;
  63         unsigned int gids_cur;
  64         unsigned int gids_max;
  65 };
  66
  67 enum operation_type {
  68         OP_UNSET,
  69
  70         OP_MATCH,
  71         OP_NOMATCH,
  72         OP_MATCH_MAX,
  73
  74         OP_ADD,
  75         OP_ASSIGN,
  76         OP_ASSIGN_FINAL,
  77 };
  78
  79 enum string_glob_type {
  80         GL_UNSET,
  81         GL_PLAIN,                       /* no special chars */
  82         GL_GLOB,                        /* shell globs ?,*,[] */
  83         GL_SPLIT,                       /* multi-value A|B */
  84         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
  85         GL_SOMETHING,                   /* commonly used "?*" */
  86         GL_FORMAT,
  87 };
  88
  89 /* tokens of a rule are sorted/handled in this order */
  90 enum token_type {
  91         TK_UNSET,
  92         TK_RULE,
  93
  94         TK_M_ACTION,                    /* val */
  95         TK_M_DEVPATH,                   /* val */
  96         TK_M_KERNEL,                    /* val */
  97         TK_M_DEVLINK,                   /* val */
  98         TK_M_NAME,                      /* val */
  99         TK_M_ENV,                       /* val, attr */
 100         TK_M_SUBSYSTEM,                 /* val */
 101         TK_M_DRIVER,                    /* val */
 102         TK_M_WAITFOR,                   /* val */
 103         TK_M_ATTR,                      /* val, attr */
 104
 105         TK_M_PARENTS_MIN,
 106         TK_M_KERNELS,                   /* val */
 107         TK_M_SUBSYSTEMS,                /* val */
 108         TK_M_DRIVERS,                   /* val */
 109         TK_M_ATTRS,                     /* val, attr */
 110         TK_M_PARENTS_MAX,
 111
 112         TK_M_TEST,                      /* val, mode_t */
 113         TK_M_PROGRAM,                   /* val */
 114         TK_M_IMPORT_FILE,               /* val */
 115         TK_M_IMPORT_PROG,               /* val */
 116         TK_M_IMPORT_PARENT,             /* val */
 117         TK_M_RESULT,                    /* val */
 118         TK_M_MAX,
 119
 120         TK_A_IGNORE_DEVICE,
 121         TK_A_STRING_ESCAPE_NONE,
 122         TK_A_STRING_ESCAPE_REPLACE,
 123         TK_A_NUM_FAKE_PART,             /* int */
 124         TK_A_DEVLINK_PRIO,              /* int */
 125         TK_A_OWNER,                     /* val */
 126         TK_A_GROUP,                     /* val */
 127         TK_A_MODE,                      /* val */
 128         TK_A_OWNER_ID,                  /* uid_t */
 129         TK_A_GROUP_ID,                  /* gid_t */
 130         TK_A_MODE_ID,                   /* mode_t */
 131         TK_A_ENV,                       /* val, attr */
 132         TK_A_NAME,                      /* val */
 133         TK_A_DEVLINK,                   /* val */
 134         TK_A_EVENT_TIMEOUT,             /* int */
 135         TK_A_IGNORE_REMOVE,
 136         TK_A_ATTR,                      /* val, attr */
 137         TK_A_RUN,                       /* val, bool */
 138         TK_A_GOTO,                      /* size_t */
 139         TK_A_LAST_RULE,
 140
 141         TK_END,
 142 };
 143
 144 /* we try to pack stuff in a way that we take only 16 bytes per token */
 145 struct token {
 146         union {
 147                 unsigned short type;            /* same as in rule and key */
 148                 struct {
 149                         unsigned short type;
 150                         unsigned short flags;
 151                         unsigned int next_rule;
 152                         unsigned int label_off;
 153                         unsigned short filename_off;
 154                         unsigned short filename_line;
 155                 } rule;
 156                 struct {
 157                         unsigned short type;
 158                         unsigned short flags;
 159                         unsigned short op;
 160                         unsigned short glob;
 161                         unsigned int value_off;
 162                         union {
 163                                 unsigned int attr_off;
 164                                 int ignore_error;
 165                                 int i;
 166                                 unsigned int rule_goto;
 167                                 mode_t  mode;
 168                                 uid_t uid;
 169                                 gid_t gid;
 170                                 int num_fake_part;
 171                                 int devlink_prio;
 172                                 int event_timeout;
 173                         };
 174                 } key;
 175         };
 176 };
 177
 178 #define MAX_TK          64
 179 struct rule_tmp {
 180         struct udev_rules *rules;
 181         struct token rule;
 182         struct token token[MAX_TK];
 183         unsigned int token_cur;
 184 };
 185
 186 #ifdef DEBUG
 187 static const char *operation_str[] = {
 188         [OP_UNSET] =            "UNSET",
 189         [OP_MATCH] =            "match",
 190         [OP_NOMATCH] =          "nomatch",
 191         [OP_MATCH_MAX] =        "MATCH_MAX",
 192
 193         [OP_ADD] =              "add",
 194         [OP_ASSIGN] =           "assign",
 195         [OP_ASSIGN_FINAL] =     "assign-final",
 196 };
 197
 198 static const char *string_glob_str[] = {
 199         [GL_UNSET] =            "UNSET",
 200         [GL_PLAIN] =            "plain",
 201         [GL_GLOB] =             "glob",
 202         [GL_SPLIT] =            "split",
 203         [GL_SPLIT_GLOB] =       "split-glob",
 204         [GL_SOMETHING] =        "split-glob",
 205         [GL_FORMAT] =           "format",
 206 };
 207
 208 static const char *token_str[] = {
 209         [TK_UNSET] =                    "UNSET",
 210         [TK_RULE] =                     "RULE",
 211
 212         [TK_M_ACTION] =                 "M ACTION",
 213         [TK_M_DEVPATH] =                "M DEVPATH",
 214         [TK_M_KERNEL] =                 "M KERNEL",
 215         [TK_M_DEVLINK] =                "M DEVLINK",
 216         [TK_M_NAME] =                   "M NAME",
 217         [TK_M_ENV] =                    "M ENV",
 218         [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 219         [TK_M_DRIVER] =                 "M DRIVER",
 220         [TK_M_WAITFOR] =                "M WAITFOR",
 221         [TK_M_ATTR] =                   "M ATTR",
 222
 223         [TK_M_PARENTS_MIN] =        "M PARENTS_MIN",
 224         [TK_M_KERNELS] =                "M KERNELS",
 225         [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 226         [TK_M_DRIVERS] =                "M DRIVERS",
 227         [TK_M_ATTRS] =                  "M ATTRS",
 228         [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 229
 230         [TK_M_TEST] =                   "M TEST",
 231         [TK_M_PROGRAM] =                "M PROGRAM",
 232         [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 233         [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 234         [TK_M_IMPORT_PARENT] =          "M MPORT_PARENT",
 235         [TK_M_RESULT] =                 "M RESULT",
 236         [TK_M_MAX] =                    "M MAX",
 237
 238         [TK_A_IGNORE_DEVICE] =          "A IGNORE_DEVICE",
 239         [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 240         [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 241         [TK_A_NUM_FAKE_PART] =          "A NUM_FAKE_PART",
 242         [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 243         [TK_A_OWNER] =                  "A OWNER",
 244         [TK_A_GROUP] =                  "A GROUP",
 245         [TK_A_MODE] =                   "A MODE",
 246         [TK_A_OWNER_ID] =               "A OWNER_ID",
 247         [TK_A_GROUP_ID] =               "A GROUP_ID",
 248         [TK_A_MODE_ID] =                "A MODE_ID",
 249         [TK_A_ENV] =                    "A ENV",
 250         [TK_A_NAME] =                   "A NAME",
 251         [TK_A_DEVLINK] =                "A DEVLINK",
 252         [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 253         [TK_A_IGNORE_REMOVE] =          "A IGNORE_REMOVE",
 254         [TK_A_ATTR] =                   "A ATTR",
 255         [TK_A_RUN] =                    "A RUN",
 256         [TK_A_GOTO] =                   "A GOTO",
 257         [TK_A_LAST_RULE] =              "A LAST_RULE",
 258
 259         [TK_END] =                      "END",
 260 };
 261
 262 static void dump_token(struct udev_rules *rules, struct token *token)
 263 {
 264         enum token_type type = token->type;
 265         enum operation_type op = token->key.op;
 266         enum string_glob_type glob = token->key.glob;
 267         const char *value = &rules->buf[token->key.value_off];
 268         const char *attr = &rules->buf[token->key.attr_off];
 269
 270         switch (type) {
 271         case TK_RULE:
 272                 {
 273                         const char *tks_ptr = (char *)rules->tokens;
 274                         const char *tk_ptr = (char *)token;
 275                         unsigned int off = tk_ptr - tks_ptr;
 276
 277                         dbg(rules->udev, "* RULE %s:%u, off: %u(%u), next: %u, label: '%s', flags: 0x%02x\n",
 278                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 279                             off / (unsigned int) sizeof(struct token), off,
 280                             token->rule.next_rule,
 281                             &rules->buf[token->rule.label_off],
 282                             token->rule.flags);
 283                         break;
 284                 }
 285         case TK_M_ACTION:
 286         case TK_M_DEVPATH:
 287         case TK_M_KERNEL:
 288         case TK_M_SUBSYSTEM:
 289         case TK_M_DRIVER:
 290         case TK_M_WAITFOR:
 291         case TK_M_DEVLINK:
 292         case TK_M_NAME:
 293         case TK_M_KERNELS:
 294         case TK_M_SUBSYSTEMS:
 295         case TK_M_DRIVERS:
 296         case TK_M_PROGRAM:
 297         case TK_M_IMPORT_FILE:
 298         case TK_M_IMPORT_PROG:
 299         case TK_M_IMPORT_PARENT:
 300         case TK_M_RESULT:
 301         case TK_A_NAME:
 302         case TK_A_DEVLINK:
 303         case TK_A_OWNER:
 304         case TK_A_GROUP:
 305         case TK_A_MODE:
 306         case TK_A_RUN:
 307                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 308                     token_str[type], operation_str[op], value, string_glob_str[glob]);
 309                 break;
 310         case TK_M_ATTR:
 311         case TK_M_ATTRS:
 312         case TK_M_ENV:
 313         case TK_A_ATTR:
 314         case TK_A_ENV:
 315                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 316                     token_str[type], operation_str[op], attr, value, string_glob_str[glob]);
 317                 break;
 318         case TK_A_IGNORE_DEVICE:
 319         case TK_A_STRING_ESCAPE_NONE:
 320         case TK_A_STRING_ESCAPE_REPLACE:
 321         case TK_A_LAST_RULE:
 322         case TK_A_IGNORE_REMOVE:
 323                 dbg(rules->udev, "%s\n", token_str[type]);
 324                 break;
 325         case TK_M_TEST:
 326                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 327                     token_str[type], operation_str[op], value, string_glob_str[glob], token->key.mode);
 328                 break;
 329         case TK_A_NUM_FAKE_PART:
 330                 dbg(rules->udev, "%s %u\n", token_str[type], token->key.num_fake_part);
 331                 break;
 332         case TK_A_DEVLINK_PRIO:
 333                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.devlink_prio);
 334                 break;
 335         case TK_A_OWNER_ID:
 336                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.uid);
 337                 break;
 338         case TK_A_GROUP_ID:
 339                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.gid);
 340                 break;
 341         case TK_A_MODE_ID:
 342                 dbg(rules->udev, "%s %s %#o\n", token_str[type], operation_str[op], token->key.mode);
 343                 break;
 344         case TK_A_EVENT_TIMEOUT:
 345                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.event_timeout);
 346                 break;
 347         case TK_A_GOTO:
 348                 dbg(rules->udev, "%s '%s' %u\n", token_str[type], value, token->key.rule_goto);
 349                 break;
 350         case TK_END:
 351                 dbg(rules->udev, "* %s\n", token_str[type]);
 352                 break;
 353         case TK_M_PARENTS_MIN:
 354         case TK_M_PARENTS_MAX:
 355         case TK_M_MAX:
 356         case TK_UNSET:
 357                 dbg(rules->udev, "unknown type %u\n", type);
 358                 break;
 359         }
 360 }
 361
 362 static void dump_rules(struct udev_rules *rules)
 363 {
 364         unsigned int i;
 365
 366         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 367             rules->token_cur,
 368             rules->token_cur * sizeof(struct token),
 369             rules->buf_count,
 370             rules->buf_cur);
 371         for(i = 0; i < rules->token_cur; i++)
 372                 dump_token(rules, &rules->tokens[i]);
 373 }
 374 #else
 375 static const char **operation_str;
 376 static const char **token_str;
 377 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 378 static inline void dump_rules(struct udev_rules *rules) {}
 379 #endif /* DEBUG */
 380
 381 /* we could lookup and return existing strings, or tails of strings */
 382 static int add_string(struct udev_rules *rules, const char *str)
 383 {
 384         size_t len = strlen(str)+1;
 385         int off;
 386
 387         /* offset 0 is always '\0' */
 388         if (str[0] == '\0')
 389                 return 0;
 390
 391         /* grow buffer if needed */
 392         if (rules->buf_cur + len+1 >= rules->buf_max) {
 393                 char *buf;
 394                 unsigned int add;
 395
 396                 /* double the buffer size */
 397                 add = rules->buf_max;
 398                 if (add < len * 8)
 399                         add = len * 8;
 400
 401                 buf = realloc(rules->buf, rules->buf_max + add);
 402                 if (buf == NULL)
 403                         return -1;
 404                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 405                 rules->buf = buf;
 406                 rules->buf_max += add;
 407         }
 408         off = rules->buf_cur;
 409         memcpy(&rules->buf[rules->buf_cur], str, len);
 410         rules->buf_cur += len;
 411         rules->buf_count++;
 412         return off;
 413 }
 414
 415 static int add_token(struct udev_rules *rules, struct token *token)
 416 {
 417
 418         /* grow buffer if needed */
 419         if (rules->token_cur+1 >= rules->token_max) {
 420                 struct token *tokens;
 421                 unsigned int add;
 422
 423                 /* double the buffer size */
 424                 add = rules->token_max;
 425                 if (add < 8)
 426                         add = 8;
 427
 428                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 429                 if (tokens == NULL)
 430                         return -1;
 431                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 432                 rules->tokens = tokens;
 433                 rules->token_max += add;
 434         }
 435         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 436         rules->token_cur++;
 437         return 0;
 438 }
 439
 440 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 441 {
 442         unsigned int i;
 443         uid_t uid;
 444         unsigned int off;
 445
 446         /* lookup, if we know it already */
 447         for (i = 0; i < rules->uids_cur; i++) {
 448                 off = rules->uids[i].name_off;
 449                 if (strcmp(&rules->buf[off], owner) == 0) {
 450                         uid = rules->uids[i].uid;
 451                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 452                         return uid;
 453                 }
 454         }
 455         uid = util_lookup_user(rules->udev, owner);
 456
 457         /* grow buffer if needed */
 458         if (rules->uids_cur+1 >= rules->uids_max) {
 459                 struct uid_gid *uids;
 460                 unsigned int add;
 461
 462                 /* double the buffer size */
 463                 add = rules->uids_max;
 464                 if (add < 1)
 465                         add = 8;
 466
 467                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 468                 if (uids == NULL)
 469                         return uid;
 470                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 471                 rules->uids = uids;
 472                 rules->uids_max += add;
 473         }
 474         rules->uids[rules->uids_cur].uid = uid;
 475         off = add_string(rules, owner);
 476         if (off <= 0)
 477                 return uid;
 478         rules->uids[rules->uids_cur].name_off = off;
 479         rules->uids_cur++;
 480         return uid;
 481 }
 482
 483 static gid_t add_gid(struct udev_rules *rules, const char *group)
 484 {
 485         unsigned int i;
 486         gid_t gid;
 487         unsigned int off;
 488
 489         /* lookup, if we know it already */
 490         for (i = 0; i < rules->gids_cur; i++) {
 491                 off = rules->gids[i].name_off;
 492                 if (strcmp(&rules->buf[off], group) == 0) {
 493                         gid = rules->gids[i].gid;
 494                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 495                         return gid;
 496                 }
 497         }
 498         gid = util_lookup_group(rules->udev, group);
 499
 500         /* grow buffer if needed */
 501         if (rules->gids_cur+1 >= rules->gids_max) {
 502                 struct uid_gid *gids;
 503                 unsigned int add;
 504
 505                 /* double the buffer size */
 506                 add = rules->gids_max;
 507                 if (add < 1)
 508                         add = 8;
 509
 510                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 511                 if (gids == NULL)
 512                         return gid;
 513                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 514                 rules->gids = gids;
 515                 rules->gids_max += add;
 516         }
 517         rules->gids[rules->gids_cur].gid = gid;
 518         off = add_string(rules, group);
 519         if (off <= 0)
 520                 return gid;
 521         rules->gids[rules->gids_cur].name_off = off;
 522         rules->gids_cur++;
 523         return gid;
 524 }
 525
 526 static int import_property_from_string(struct udev_device *dev, char *line)
 527 {
 528         struct udev *udev = udev_device_get_udev(dev);
 529         char *key;
 530         char *val;
 531         size_t len;
 532
 533         /* find key */
 534         key = line;
 535         while (isspace(key[0]))
 536                 key++;
 537
 538         /* comment or empty line */
 539         if (key[0] == '#' || key[0] == '\0')
 540                 return -1;
 541
 542         /* split key/value */
 543         val = strchr(key, '=');
 544         if (val == NULL)
 545                 return -1;
 546         val[0] = '\0';
 547         val++;
 548
 549         /* find value */
 550         while (isspace(val[0]))
 551                 val++;
 552
 553         /* terminate key */
 554         len = strlen(key);
 555         if (len == 0)
 556                 return -1;
 557         while (isspace(key[len-1]))
 558                 len--;
 559         key[len] = '\0';
 560
 561         /* terminate value */
 562         len = strlen(val);
 563         if (len == 0)
 564                 return -1;
 565         while (isspace(val[len-1]))
 566                 len--;
 567         val[len] = '\0';
 568
 569         if (len == 0)
 570                 return -1;
 571
 572         /* unquote */
 573         if (val[0] == '"' || val[0] == '\'') {
 574                 if (val[len-1] != val[0]) {
 575                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 576                         return -1;
 577                 }
 578                 val[len-1] = '\0';
 579                 val++;
 580         }
 581
 582         dbg(udev, "adding '%s'='%s'\n", key, val);
 583
 584         /* handle device, renamed by external tool, returning new path */
 585         if (strcmp(key, "DEVPATH") == 0) {
 586                 char syspath[UTIL_PATH_SIZE];
 587
 588                 info(udev, "updating devpath from '%s' to '%s'\n",
 589                      udev_device_get_devpath(dev), val);
 590                 util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
 591                 util_strlcat(syspath, val, sizeof(syspath));
 592                 udev_device_set_syspath(dev, syspath);
 593         } else {
 594                 struct udev_list_entry *entry;
 595
 596                 entry = udev_device_add_property(dev, key, val);
 597                 /* store in db */
 598                 udev_list_entry_set_flag(entry, 1);
 599         }
 600         return 0;
 601 }
 602
 603 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 604 {
 605         FILE *f;
 606         char line[UTIL_LINE_SIZE];
 607
 608         f = fopen(filename, "r");
 609         if (f == NULL)
 610                 return -1;
 611         while (fgets(line, sizeof(line), f) != NULL)
 612                 import_property_from_string(dev, line);
 613         fclose(f);
 614         return 0;
 615 }
 616
 617 static int import_program_into_properties(struct udev_device *dev, const char *program)
 618 {
 619         struct udev *udev = udev_device_get_udev(dev);
 620         char **envp;
 621         char result[2048];
 622         size_t reslen;
 623         char *line;
 624
 625         envp = udev_device_get_properties_envp(dev);
 626         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen) != 0)
 627                 return -1;
 628
 629         line = result;
 630         while (line != NULL) {
 631                 char *pos;
 632
 633                 pos = strchr(line, '\n');
 634                 if (pos != NULL) {
 635                         pos[0] = '\0';
 636                         pos = &pos[1];
 637                 }
 638                 import_property_from_string(dev, line);
 639                 line = pos;
 640         }
 641         return 0;
 642 }
 643
 644 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 645 {
 646         struct udev *udev = udev_device_get_udev(dev);
 647         struct udev_device *dev_parent;
 648         struct udev_list_entry *list_entry;
 649
 650         dev_parent = udev_device_get_parent(dev);
 651         if (dev_parent == NULL)
 652                 return -1;
 653
 654         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 655         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 656                 const char *key = udev_list_entry_get_name(list_entry);
 657                 const char *val = udev_list_entry_get_value(list_entry);
 658
 659                 if (fnmatch(filter, key, 0) == 0) {
 660                         struct udev_list_entry *entry;
 661
 662                         dbg(udev, "import key '%s=%s'\n", key, val);
 663                         entry = udev_device_add_property(dev, key, val);
 664                         /* store in db */
 665                         udev_list_entry_set_flag(entry, 1);
 666                 }
 667         }
 668         return 0;
 669 }
 670
 671 #define WAIT_LOOP_PER_SECOND            50
 672 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 673 {
 674         struct udev *udev = udev_device_get_udev(dev);
 675         char filepath[UTIL_PATH_SIZE];
 676         char devicepath[UTIL_PATH_SIZE];
 677         struct stat stats;
 678         int loop = timeout * WAIT_LOOP_PER_SECOND;
 679
 680         /* a relative path is a device attribute */
 681         devicepath[0] = '\0';
 682         if (file[0] != '/') {
 683                 util_strlcpy(devicepath, udev_get_sys_path(udev), sizeof(devicepath));
 684                 util_strlcat(devicepath, udev_device_get_devpath(dev), sizeof(devicepath));
 685
 686                 util_strlcpy(filepath, devicepath, sizeof(filepath));
 687                 util_strlcat(filepath, "/", sizeof(filepath));
 688                 util_strlcat(filepath, file, sizeof(filepath));
 689                 file = filepath;
 690         }
 691
 692         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 693         while (--loop) {
 694                 /* lookup file */
 695                 if (stat(file, &stats) == 0) {
 696                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 697                         return 0;
 698                 }
 699                 /* make sure, the device did not disappear in the meantime */
 700                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 701                         info(udev, "device disappeared while waiting for '%s'\n", file);
 702                         return -2;
 703                 }
 704                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 705                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 706         }
 707         info(udev, "waiting for '%s' failed\n", file);
 708         return -1;
 709 }
 710
 711 static int attr_subst_subdir(char *attr, size_t len)
 712 {
 713         char *pos;
 714         int found = 0;
 715
 716         pos = strstr(attr, "/*/");
 717         if (pos != NULL) {
 718                 char str[UTIL_PATH_SIZE];
 719                 DIR *dir;
 720
 721                 pos[1] = '\0';
 722                 util_strlcpy(str, &pos[2], sizeof(str));
 723                 dir = opendir(attr);
 724                 if (dir != NULL) {
 725                         struct dirent *dent;
 726
 727                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 728                                 struct stat stats;
 729
 730                                 if (dent->d_name[0] == '.')
 731                                         continue;
 732                                 util_strlcat(attr, dent->d_name, len);
 733                                 util_strlcat(attr, str, len);
 734                                 if (stat(attr, &stats) == 0) {
 735                                         found = 1;
 736                                         break;
 737                                 }
 738                                 pos[1] = '\0';
 739                         }
 740                         closedir(dir);
 741                 }
 742                 if (!found)
 743                         util_strlcat(attr, str, len);
 744         }
 745
 746         return found;
 747 }
 748
 749 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 750 {
 751         char *linepos;
 752         char *temp;
 753
 754         linepos = *line;
 755         if (linepos == NULL && linepos[0] == '\0')
 756                 return -1;
 757
 758         /* skip whitespace */
 759         while (isspace(linepos[0]) || linepos[0] == ',')
 760                 linepos++;
 761
 762         /* get the key */
 763         if (linepos[0] == '\0')
 764                 return -1;
 765         *key = linepos;
 766
 767         while (1) {
 768                 linepos++;
 769                 if (linepos[0] == '\0')
 770                         return -1;
 771                 if (isspace(linepos[0]))
 772                         break;
 773                 if (linepos[0] == '=')
 774                         break;
 775                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 776                         if (linepos[1] == '=')
 777                                 break;
 778         }
 779
 780         /* remember end of key */
 781         temp = linepos;
 782
 783         /* skip whitespace after key */
 784         while (isspace(linepos[0]))
 785                 linepos++;
 786         if (linepos[0] == '\0')
 787                 return -1;
 788
 789         /* get operation type */
 790         if (linepos[0] == '=' && linepos[1] == '=') {
 791                 *op = OP_MATCH;
 792                 linepos += 2;
 793         } else if (linepos[0] == '!' && linepos[1] == '=') {
 794                 *op = OP_NOMATCH;
 795                 linepos += 2;
 796         } else if (linepos[0] == '+' && linepos[1] == '=') {
 797                 *op = OP_ADD;
 798                 linepos += 2;
 799         } else if (linepos[0] == '=') {
 800                 *op = OP_ASSIGN;
 801                 linepos++;
 802         } else if (linepos[0] == ':' && linepos[1] == '=') {
 803                 *op = OP_ASSIGN_FINAL;
 804                 linepos += 2;
 805         } else
 806                 return -1;
 807
 808         /* terminate key */
 809         temp[0] = '\0';
 810
 811         /* skip whitespace after operator */
 812         while (isspace(linepos[0]))
 813                 linepos++;
 814         if (linepos[0] == '\0')
 815                 return -1;
 816
 817         /* get the value */
 818         if (linepos[0] == '"')
 819                 linepos++;
 820         else
 821                 return -1;
 822         *value = linepos;
 823
 824         /* terminate */
 825         temp = strchr(linepos, '"');
 826         if (!temp)
 827                 return -1;
 828         temp[0] = '\0';
 829         temp++;
 830         dbg(udev, "%s '%s'-'%s'\n", operation_str[*op], *key, *value);
 831
 832         /* move line to next key */
 833         *line = temp;
 834         return 0;
 835 }
 836
 837 /* extract possible KEY{attr} */
 838 static char *get_key_attribute(struct udev *udev, char *str)
 839 {
 840         char *pos;
 841         char *attr;
 842
 843         attr = strchr(str, '{');
 844         if (attr != NULL) {
 845                 attr++;
 846                 pos = strchr(attr, '}');
 847                 if (pos == NULL) {
 848                         err(udev, "missing closing brace for format\n");
 849                         return NULL;
 850                 }
 851                 pos[0] = '\0';
 852                 dbg(udev, "attribute='%s'\n", attr);
 853                 return attr;
 854         }
 855         return NULL;
 856 }
 857
 858 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 859                         enum operation_type op,
 860                         const char *value, const void *data)
 861 {
 862         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 863         const char *attr = data;
 864         enum string_glob_type glob;
 865
 866         memset(token, 0x00, sizeof(struct token));
 867
 868         switch (type) {
 869         case TK_M_ACTION:
 870         case TK_M_DEVPATH:
 871         case TK_M_KERNEL:
 872         case TK_M_SUBSYSTEM:
 873         case TK_M_DRIVER:
 874         case TK_M_WAITFOR:
 875         case TK_M_DEVLINK:
 876         case TK_M_NAME:
 877         case TK_M_KERNELS:
 878         case TK_M_SUBSYSTEMS:
 879         case TK_M_DRIVERS:
 880         case TK_M_PROGRAM:
 881         case TK_M_IMPORT_FILE:
 882         case TK_M_IMPORT_PROG:
 883         case TK_M_IMPORT_PARENT:
 884         case TK_M_RESULT:
 885         case TK_A_OWNER:
 886         case TK_A_GROUP:
 887         case TK_A_MODE:
 888         case TK_A_NAME:
 889         case TK_A_DEVLINK:
 890         case TK_A_GOTO:
 891                 token->key.value_off = add_string(rule_tmp->rules, value);
 892                 break;
 893         case TK_M_ENV:
 894         case TK_M_ATTR:
 895         case TK_M_ATTRS:
 896         case TK_A_ATTR:
 897         case TK_A_ENV:
 898                 token->key.value_off = add_string(rule_tmp->rules, value);
 899                 token->key.attr_off = add_string(rule_tmp->rules, attr);
 900                 break;
 901         case TK_M_TEST:
 902                 token->key.value_off = add_string(rule_tmp->rules, value);
 903                 if (data != NULL)
 904                         token->key.mode = *(mode_t *)data;
 905                 break;
 906         case TK_A_IGNORE_DEVICE:
 907         case TK_A_STRING_ESCAPE_NONE:
 908         case TK_A_STRING_ESCAPE_REPLACE:
 909         case TK_A_IGNORE_REMOVE:
 910         case TK_A_LAST_RULE:
 911                 break;
 912         case TK_A_RUN:
 913                 token->key.value_off = add_string(rule_tmp->rules, value);
 914                 token->key.ignore_error = *(int *)data;
 915                 break;
 916         case TK_A_NUM_FAKE_PART:
 917                 token->key.num_fake_part = *(int *)data;
 918                 break;
 919         case TK_A_DEVLINK_PRIO:
 920                 token->key.devlink_prio = *(int *)data;
 921                 break;
 922         case TK_A_OWNER_ID:
 923                 token->key.uid = *(uid_t *)data;
 924                 break;
 925         case TK_A_GROUP_ID:
 926                 token->key.gid = *(gid_t *)data;
 927                 break;
 928         case TK_A_MODE_ID:
 929                 token->key.mode = *(mode_t *)data;
 930                 break;
 931         case TK_A_EVENT_TIMEOUT:
 932                 token->key.event_timeout = *(int *)data;
 933                 break;
 934         case TK_RULE:
 935         case TK_M_PARENTS_MIN:
 936         case TK_M_PARENTS_MAX:
 937         case TK_M_MAX:
 938         case TK_END:
 939         case TK_UNSET:
 940                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
 941                 return -1;
 942         }
 943
 944         glob = GL_PLAIN;
 945         if (value != NULL) {
 946                 if (type < TK_M_MAX) {
 947                         /* check if we need to split or call fnmatch() while matching rules */
 948                         int has_split;
 949                         int has_glob;
 950
 951                         has_split = (strchr(value, '|') != NULL);
 952                         has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL ||
 953                                     strchr(value, '[') != NULL || strchr(value, ']') != NULL);
 954                         if (has_split && has_glob) {
 955                                 glob = GL_SPLIT_GLOB;
 956                         } else if (has_split) {
 957                                 glob = GL_SPLIT;
 958                         } else if (has_glob) {
 959                                 if (strcmp(value, "?*") == 0)
 960                                         glob = GL_SOMETHING;
 961                                 else
 962                                         glob = GL_GLOB;
 963                         }
 964                 } else {
 965                         /* check if we need to substitute format strings for matching rules */
 966                         if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
 967                                 glob = GL_FORMAT;
 968                 }
 969         }
 970
 971         token->key.type = type;
 972         token->key.op = op;
 973         token->key.glob = glob;
 974         rule_tmp->token_cur++;
 975         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
 976                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
 977                 return -1;
 978         }
 979         return 0;
 980 }
 981
 982 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
 983 {
 984         unsigned int i;
 985         unsigned int start = 0;
 986         unsigned int end = rule_tmp->token_cur;
 987
 988         for (i = 0; i < rule_tmp->token_cur; i++) {
 989                 enum token_type next_val = TK_UNSET;
 990                 unsigned int next_idx;
 991                 unsigned int j;
 992
 993                 /* find smallest value */
 994                 for (j = start; j < end; j++) {
 995                         if (rule_tmp->token[j].type == TK_UNSET)
 996                                 continue;
 997                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
 998                                 next_val = rule_tmp->token[j].type;
 999                                 next_idx = j;
1000                         }
1001                 }
1002
1003                 /* add token and mark done */
1004                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1005                         return -1;
1006                 rule_tmp->token[next_idx].type = TK_UNSET;
1007
1008                 /* shrink range */
1009                 if (next_idx == start)
1010                         start++;
1011                 if (next_idx+1 == end)
1012                         end--;
1013         }
1014         return 0;
1015 }
1016
1017 static int add_rule(struct udev_rules *rules, char *line,
1018                     const char *filename, unsigned int filename_off, unsigned int lineno)
1019 {
1020         int valid = 0;
1021         char *linepos;
1022         char *attr;
1023         int physdev = 0;
1024         struct rule_tmp rule_tmp;
1025
1026         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1027         rule_tmp.rules = rules;
1028         rule_tmp.rule.type = TK_RULE;
1029         rule_tmp.rule.rule.filename_off = filename_off;
1030         rule_tmp.rule.rule.filename_line = lineno;
1031
1032         linepos = line;
1033         while (1) {
1034                 char *key;
1035                 char *value;
1036                 enum operation_type op;
1037
1038                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1039                         break;
1040
1041                 if (strcasecmp(key, "ACTION") == 0) {
1042                         if (op > OP_MATCH_MAX) {
1043                                 err(rules->udev, "invalid ACTION operation\n");
1044                                 goto invalid;
1045                         }
1046                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1047                         valid = 1;
1048                         continue;
1049                 }
1050
1051                 if (strcasecmp(key, "DEVPATH") == 0) {
1052                         if (op > OP_MATCH_MAX) {
1053                                 err(rules->udev, "invalid DEVPATH operation\n");
1054                                 goto invalid;
1055                         }
1056                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1057                         valid = 1;
1058                         continue;
1059                 }
1060
1061                 if (strcasecmp(key, "KERNEL") == 0) {
1062                         if (op > OP_MATCH_MAX) {
1063                                 err(rules->udev, "invalid KERNEL operation\n");
1064                                 goto invalid;
1065                         }
1066                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1067                         valid = 1;
1068                         continue;
1069                 }
1070
1071                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
1072                         if (op > OP_MATCH_MAX) {
1073                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1074                                 goto invalid;
1075                         }
1076                         /* bus, class, subsystem events should all be the same */
1077                         if (strcmp(value, "subsystem") == 0 ||
1078                             strcmp(value, "bus") == 0 ||
1079                             strcmp(value, "class") == 0) {
1080                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1081                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1082                                             "please fix it in %s:%u", value, filename, lineno);
1083                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1084                         } else
1085                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1086                         valid = 1;
1087                         continue;
1088                 }
1089
1090                 if (strcasecmp(key, "DRIVER") == 0) {
1091                         if (op > OP_MATCH_MAX) {
1092                                 err(rules->udev, "invalid DRIVER operation\n");
1093                                 goto invalid;
1094                         }
1095                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1096                         valid = 1;
1097                         continue;
1098                 }
1099
1100                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1101                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1102                         if (attr == NULL) {
1103                                 err(rules->udev, "error parsing ATTR attribute\n");
1104                                 goto invalid;
1105                         }
1106                         if (op < OP_MATCH_MAX) {
1107                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1108                         } else {
1109                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1110                         }
1111                         valid = 1;
1112                         continue;
1113                 }
1114
1115                 if (strcasecmp(key, "KERNELS") == 0 ||
1116                     strcasecmp(key, "ID") == 0) {
1117                         if (op > OP_MATCH_MAX) {
1118                                 err(rules->udev, "invalid KERNELS operation\n");
1119                                 goto invalid;
1120                         }
1121                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1122                         valid = 1;
1123                         continue;
1124                 }
1125
1126                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
1127                     strcasecmp(key, "BUS") == 0) {
1128                         if (op > OP_MATCH_MAX) {
1129                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1130                                 goto invalid;
1131                         }
1132                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1133                         valid = 1;
1134                         continue;
1135                 }
1136
1137                 if (strcasecmp(key, "DRIVERS") == 0) {
1138                         if (op > OP_MATCH_MAX) {
1139                                 err(rules->udev, "invalid DRIVERS operation\n");
1140                                 goto invalid;
1141                         }
1142                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1143                         valid = 1;
1144                         continue;
1145                 }
1146
1147                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
1148                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1149                         if (op > OP_MATCH_MAX) {
1150                                 err(rules->udev, "invalid ATTRS operation\n");
1151                                 goto invalid;
1152                         }
1153                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1154                         if (attr == NULL) {
1155                                 err(rules->udev, "error parsing ATTRS attribute\n");
1156                                 goto invalid;
1157                         }
1158                         if (strncmp(attr, "device/", 7) == 0)
1159                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1160                                     "please fix it in %s:%u", filename, lineno);
1161                         else if (strstr(attr, "../") != NULL)
1162                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1163                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1164                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1165                         valid = 1;
1166                         continue;
1167                 }
1168
1169                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1170                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1171                         if (attr == NULL) {
1172                                 err(rules->udev, "error parsing ENV attribute\n");
1173                                 goto invalid;
1174                         }
1175                         if (strncmp(attr, "PHYSDEV", 7) == 0)
1176                                 physdev = 1;
1177                         if (op < OP_MATCH_MAX) {
1178                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1179                                         goto invalid;
1180                         } else {
1181                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1182                                         goto invalid;
1183                         }
1184                         valid = 1;
1185                         continue;
1186                 }
1187
1188                 if (strcasecmp(key, "PROGRAM") == 0) {
1189                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1190                         valid = 1;
1191                         continue;
1192                 }
1193
1194                 if (strcasecmp(key, "RESULT") == 0) {
1195                         if (op > OP_MATCH_MAX) {
1196                                 err(rules->udev, "invalid RESULT operation\n");
1197                                 goto invalid;
1198                         }
1199                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1200                         valid = 1;
1201                         continue;
1202                 }
1203
1204                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1205                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1206                         if (attr != NULL && strstr(attr, "program")) {
1207                                 dbg(rules->udev, "IMPORT will be executed\n");
1208                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1209                                 valid = 1;
1210                         } else if (attr != NULL && strstr(attr, "file")) {
1211                                 dbg(rules->udev, "IMPORT will be included as file\n");
1212                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1213                                 valid = 1;
1214                         } else if (attr != NULL && strstr(attr, "parent")) {
1215                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1216                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1217                                 valid = 1;
1218                         } else {
1219                                 /* figure it out if it is executable */
1220                                 char file[UTIL_PATH_SIZE];
1221                                 char *pos;
1222                                 struct stat statbuf;
1223
1224                                 util_strlcpy(file, value, sizeof(file));
1225                                 pos = strchr(file, ' ');
1226                                 if (pos)
1227                                         pos[0] = '\0';
1228
1229                                 /* allow programs in /lib/udev called without the path */
1230                                 if (strchr(file, '/') == NULL) {
1231                                         util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file));
1232                                         util_strlcat(file, value, sizeof(file));
1233                                         pos = strchr(file, ' ');
1234                                         if (pos)
1235                                                 pos[0] = '\0';
1236                                 }
1237
1238                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1239                                 if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
1240                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1241                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1242                                         valid = 1;
1243                                 } else {
1244                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1245                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1246                                         valid = 1;
1247                                 }
1248                         }
1249                         continue;
1250                 }
1251
1252                 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
1253                         mode_t mode = 0;
1254
1255                         if (op > OP_MATCH_MAX) {
1256                                 err(rules->udev, "invalid TEST operation\n");
1257                                 goto invalid;
1258                         }
1259                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1260                         if (attr != NULL) {
1261                                 mode = strtol(attr, NULL, 8);
1262                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1263                         } else {
1264                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1265                         }
1266                         valid = 1;
1267                         continue;
1268                 }
1269
1270                 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
1271                         int flag = 0;
1272
1273                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1274                         if (attr != NULL && strstr(attr, "ignore_error"))
1275                                 flag = 1;
1276                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1277                         valid = 1;
1278                         continue;
1279                 }
1280
1281                 if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
1282                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1283                         valid = 1;
1284                         continue;
1285                 }
1286
1287                 if (strcasecmp(key, "LABEL") == 0) {
1288                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1289                         valid = 1;
1290                         continue;
1291                 }
1292
1293                 if (strcasecmp(key, "GOTO") == 0) {
1294                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1295                         valid = 1;
1296                         continue;
1297                 }
1298
1299                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
1300                         if (op < OP_MATCH_MAX) {
1301                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1302                         } else {
1303                                 if (value[0] == '\0')
1304                                         dbg(rules->udev, "name empty, node creation suppressed\n");
1305                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1306                                 attr = get_key_attribute(rules->udev, key + sizeof("NAME")-1);
1307                                 if (attr != NULL) {
1308                                         if (strstr(attr, "all_partitions") != NULL) {
1309                                                 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1310
1311                                                 dbg(rules->udev, "creation of partition nodes requested\n");
1312                                                 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1313                                         }
1314                                         if (strstr(attr, "ignore_remove") != NULL) {
1315                                                 dbg(rules->udev, "remove event should be ignored\n");
1316                                                 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1317                                         }
1318                                 }
1319                         }
1320                         rule_tmp.rule.rule.flags = 1;
1321                         continue;
1322                 }
1323
1324                 if (strcasecmp(key, "SYMLINK") == 0) {
1325                         if (op < OP_MATCH_MAX)
1326                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1327                         else
1328                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1329                         rule_tmp.rule.rule.flags = 1;
1330                         valid = 1;
1331                         continue;
1332                 }
1333
1334                 if (strcasecmp(key, "OWNER") == 0) {
1335                         uid_t uid;
1336                         char *endptr;
1337
1338                         uid = strtoul(value, &endptr, 10);
1339                         if (endptr[0] == '\0') {
1340                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1341                         } else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
1342                                 uid = add_uid(rules, value);
1343                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1344                         } else {
1345                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1346                         }
1347                         rule_tmp.rule.rule.flags = 1;
1348                         valid = 1;
1349                         continue;
1350                 }
1351
1352                 if (strcasecmp(key, "GROUP") == 0) {
1353                         gid_t gid;
1354                         char *endptr;
1355
1356                         gid = strtoul(value, &endptr, 10);
1357                         if (endptr[0] == '\0') {
1358                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1359                         } else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
1360                                 gid = add_gid(rules, value);
1361                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1362                         } else {
1363                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1364                         }
1365                         rule_tmp.rule.rule.flags = 1;
1366                         valid = 1;
1367                         continue;
1368                 }
1369
1370                 if (strcasecmp(key, "MODE") == 0) {
1371                         mode_t mode;
1372                         char *endptr;
1373
1374                         mode = strtol(value, &endptr, 8);
1375                         if (endptr[0] == '\0')
1376                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1377                         else
1378                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1379                         rule_tmp.rule.rule.flags = 1;
1380                         valid = 1;
1381                         continue;
1382                 }
1383
1384                 if (strcasecmp(key, "OPTIONS") == 0) {
1385                         const char *pos;
1386
1387                         if (strstr(value, "last_rule") != NULL) {
1388                                 dbg(rules->udev, "last rule to be applied\n");
1389                                 rule_add_key(&rule_tmp, TK_A_LAST_RULE, 0, NULL, NULL);
1390                         }
1391                         if (strstr(value, "ignore_device") != NULL) {
1392                                 dbg(rules->udev, "device should be ignored\n");
1393                                 rule_add_key(&rule_tmp, TK_A_IGNORE_DEVICE, 0, NULL, NULL);
1394                         }
1395                         if (strstr(value, "ignore_remove") != NULL) {
1396                                 dbg(rules->udev, "remove event should be ignored\n");
1397                                 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1398                         }
1399                         pos = strstr(value, "link_priority=");
1400                         if (pos != NULL) {
1401                                 int prio = atoi(&pos[strlen("link_priority=")]);
1402
1403                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1404                                 dbg(rules->udev, "link priority=%i\n", prio);
1405                         }
1406                         pos = strstr(value, "event_timeout=");
1407                         if (pos != NULL) {
1408                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1409
1410                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1411                                 dbg(rules->udev, "event timout=%i\n", tout);
1412                         }
1413                         pos = strstr(value, "string_escape=");
1414                         if (pos != NULL) {
1415                                 pos = &pos[strlen("string_escape=")];
1416                                 if (strncmp(pos, "none", strlen("none")) == 0)
1417                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1418                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1419                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1420                         }
1421                         if (strstr(value, "all_partitions") != NULL) {
1422                                 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1423
1424                                 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1425                                 dbg(rules->udev, "creation of partition nodes requested\n");
1426                         }
1427                         valid = 1;
1428                         continue;
1429                 }
1430                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1431         }
1432
1433         if (physdev)
1434                 err(rules->udev, "PHYSDEV* values are deprecated and not available on recent kernels, \n"
1435                     "please fix it in %s:%u", filename, lineno);
1436
1437         /* skip line if not any valid key was found */
1438         if (!valid)
1439                 goto invalid;
1440
1441         /* add rule token */
1442         if (add_token(rules, &rule_tmp.rule) != 0)
1443                 goto invalid;
1444
1445         /* add tokens to list, sorted by type */
1446         if (sort_token(rules, &rule_tmp) != 0)
1447                 goto invalid;
1448         return 0;
1449 invalid:
1450         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1451         return -1;
1452 }
1453
1454 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1455 {
1456         FILE *f;
1457         unsigned int first_token;
1458         char line[UTIL_LINE_SIZE];
1459         int line_nr = 0;
1460         unsigned int i;
1461
1462         info(rules->udev, "reading '%s' as rules file\n", filename);
1463
1464         f = fopen(filename, "r");
1465         if (f == NULL)
1466                 return -1;
1467
1468         first_token = rules->token_cur;
1469
1470         while(fgets(line, sizeof(line), f) != NULL) {
1471                 char *key;
1472                 size_t len;
1473
1474                 /* skip whitespace */
1475                 line_nr++;
1476                 key = line;
1477                 while (isspace(key[0]))
1478                         key++;
1479
1480                 /* comment */
1481                 if (key[0] == '#')
1482                         continue;
1483
1484                 len = strlen(line);
1485                 if (len < 3)
1486                         continue;
1487
1488                 /* continue reading if backslash+newline is found */
1489                 while (line[len-2] == '\\') {
1490                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1491                                 break;
1492                         line_nr++;
1493                         len = strlen(line);
1494                 }
1495
1496                 if (len+1 >= sizeof(line)) {
1497                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1498                         continue;
1499                 }
1500                 add_rule(rules, key, filename, filename_off, line_nr);
1501         }
1502         fclose(f);
1503
1504         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1505         for (i = first_token+1; i < rules->token_cur; i++) {
1506                 if (rules->tokens[i].type == TK_A_GOTO) {
1507                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1508                         unsigned int j;
1509
1510                         for (j = i+1; j < rules->token_cur; j++) {
1511                                 if (rules->tokens[j].type != TK_RULE)
1512                                         continue;
1513                                 if (rules->tokens[j].rule.label_off == 0)
1514                                         continue;
1515                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1516                                         continue;
1517                                 rules->tokens[i].key.rule_goto = j;
1518                         }
1519                         if (rules->tokens[i].key.rule_goto == 0)
1520                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1521                 }
1522         }
1523         return 0;
1524 }
1525
1526 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1527 {
1528         struct dirent *ent;
1529         DIR *dir;
1530         char filename[UTIL_PATH_SIZE];
1531
1532         dbg(udev, "open directory '%s'\n", dirname);
1533         dir = opendir(dirname);
1534         if (dir == NULL) {
1535                 err(udev, "unable to open '%s': %m\n", dirname);
1536                 return -1;
1537         }
1538
1539         while (1) {
1540                 ent = readdir(dir);
1541                 if (ent == NULL || ent->d_name[0] == '\0')
1542                         break;
1543
1544                 if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
1545                         continue;
1546
1547                 /* look for file matching with specified suffix */
1548                 if (suffix != NULL) {
1549                         const char *ext;
1550
1551                         ext = strrchr(ent->d_name, '.');
1552                         if (ext == NULL)
1553                                 continue;
1554                         if (strcmp(ext, suffix) != 0)
1555                                 continue;
1556                 }
1557                 dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
1558
1559                 snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
1560                 filename[sizeof(filename)-1] = '\0';
1561                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1562         }
1563
1564         closedir(dir);
1565         return 0;
1566 }
1567
1568 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1569 {
1570         struct udev_rules *rules;
1571         struct stat statbuf;
1572         struct udev_list_node file_list;
1573         struct udev_list_entry *file_loop, *file_tmp;
1574         unsigned int prev_rule;
1575         struct token end_token;
1576         unsigned int i;
1577
1578         rules = malloc(sizeof(struct udev_rules));
1579         if (rules == NULL)
1580                 return NULL;
1581         memset(rules, 0x00, sizeof(struct udev_rules));
1582         rules->udev = udev;
1583         rules->resolve_names = resolve_names;
1584         udev_list_init(&file_list);
1585
1586         /* init token array and string buffer */
1587         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1588         if (rules->tokens == NULL)
1589                 return NULL;
1590         rules->token_max = PREALLOC_TOKEN;
1591         rules->buf = malloc(PREALLOC_STRBUF);
1592         if (rules->buf == NULL)
1593                 return NULL;
1594         rules->buf_max = PREALLOC_STRBUF;
1595         /* offset 0 is always '\0' */
1596         rules->buf[0] = '\0';
1597         rules->buf_cur = 1;
1598         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1599             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1600
1601         if (udev_get_rules_path(udev) != NULL) {
1602                 /* custom rules location for testing */
1603                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1604         } else {
1605                 char filename[PATH_MAX];
1606                 struct udev_list_node sort_list;
1607                 struct udev_list_entry *sort_loop, *sort_tmp;
1608
1609                 /* read user/custom rules */
1610                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1611
1612                 /* read dynamic/temporary rules */
1613                 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
1614                 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
1615                 if (stat(filename, &statbuf) != 0) {
1616                         util_create_path(udev, filename);
1617                         udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
1618                         mkdir(filename, 0755);
1619                         udev_selinux_resetfscreatecon(udev);
1620                 }
1621                 udev_list_init(&sort_list);
1622                 add_matching_files(udev, &sort_list, filename, ".rules");
1623
1624                 /* read default rules */
1625                 add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/rules.d", ".rules");
1626
1627                 /* sort all rules files by basename into list of files */
1628                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1629                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1630                         const char *sort_base = strrchr(sort_name, '/');
1631
1632                         if (sort_base == NULL)
1633                                 continue;
1634                         /* sort entry into existing list */
1635                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1636                                 const char *file_name = udev_list_entry_get_name(file_loop);
1637                                 const char *file_base = strrchr(file_name, '/');
1638
1639                                 if (file_base == NULL)
1640                                         continue;
1641                                 if (strcmp(file_base, sort_base) == 0) {
1642                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1643                                              file_name, sort_name);
1644                                         udev_list_entry_delete(sort_loop);
1645                                         sort_loop = NULL;
1646                                         break;
1647                                 }
1648                                 if (strcmp(file_base, sort_base) > 0) {
1649                                         /* found later file, insert before */
1650                                         udev_list_entry_remove(sort_loop);
1651                                         udev_list_entry_insert_before(sort_loop, file_loop);
1652                                         sort_loop = NULL;
1653                                         break;
1654                                 }
1655                         }
1656                         /* current file already handled */
1657                         if (sort_loop == NULL)
1658                                 continue;
1659                         /* no later file, append to end of list */
1660                         udev_list_entry_remove(sort_loop);
1661                         udev_list_entry_append(sort_loop, &file_list);
1662                 }
1663         }
1664
1665         /* add all filenames to the string buffer */
1666         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1667                 const char *filename = udev_list_entry_get_name(file_loop);
1668                 unsigned int filename_off;
1669
1670                 filename_off = add_string(rules, filename);
1671                 /* the offset in the rule is limited to unsigned short */
1672                 if (filename_off < USHRT_MAX)
1673                         udev_list_entry_set_flag(file_loop, filename_off);
1674         }
1675
1676         /* parse list of files */
1677         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1678                 const char *filename = udev_list_entry_get_name(file_loop);
1679                 unsigned int filename_off = udev_list_entry_get_flag(file_loop);
1680
1681                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1682                         parse_file(rules, filename, filename_off);
1683                 else
1684                         info(udev, "can not read '%s'\n", filename);
1685                 udev_list_entry_delete(file_loop);
1686         }
1687
1688         memset(&end_token, 0x00, sizeof(struct token));
1689         end_token.type = TK_END;
1690         add_token(rules, &end_token);
1691
1692         /* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */
1693         prev_rule = 0;
1694         for (i = 1; i < rules->token_cur; i++) {
1695                 if (rules->tokens[i].type == TK_RULE) {
1696                         rules->tokens[prev_rule].rule.next_rule = i;
1697                         prev_rule = i;
1698                 }
1699         }
1700
1701         /* shrink allocated token and string buffer */
1702         if (rules->token_cur < rules->token_max) {
1703                 struct token *tokens;
1704
1705                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1706                 if (tokens != NULL || rules->token_cur == 0) {
1707                         rules->tokens = tokens;
1708                         rules->token_max = rules->token_cur;
1709                 }
1710         }
1711         if (rules->buf_cur < rules->buf_max) {
1712                 char *buf;
1713
1714                 buf = realloc(rules->buf, rules->buf_cur);
1715                 if (buf != NULL || rules->buf_cur == 0) {
1716                         rules->buf = buf;
1717                         rules->buf_max = rules->buf_cur;
1718                 }
1719         }
1720         info(udev, "shrunk to %lu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1721              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1722
1723         /* cleanup uid/gid cache */
1724         free(rules->uids);
1725         rules->uids = NULL;
1726         rules->uids_cur = 0;
1727         rules->uids_max = 0;
1728         free(rules->gids);
1729         rules->gids = NULL;
1730         rules->gids_cur = 0;
1731         rules->gids_max = 0;
1732
1733         dump_rules(rules);
1734         return rules;
1735 }
1736
1737 void udev_rules_unref(struct udev_rules *rules)
1738 {
1739         if (rules == NULL)
1740                 return;
1741         free(rules->tokens);
1742         free(rules->buf);
1743         free(rules->uids);
1744         free(rules->gids);
1745         free(rules);
1746 }
1747
1748 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1749 {
1750         char *key_value = &rules->buf[token->key.value_off];
1751         char *pos;
1752         int match = 0;
1753
1754         if (val == NULL)
1755                 val = "";
1756
1757         switch (token->key.glob) {
1758         case GL_PLAIN:
1759                 match = (strcmp(key_value, val) == 0);
1760                 break;
1761         case GL_GLOB:
1762                 match = (fnmatch(key_value, val, 0) == 0);
1763                 break;
1764         case GL_SPLIT:
1765                 {
1766                         const char *split;
1767                         size_t len;
1768
1769                         split = &rules->buf[token->key.value_off];
1770                         len = strlen(val);
1771                         while (1) {
1772                                 const char *next;
1773
1774                                 next = strchr(split, '|');
1775                                 if (next != NULL) {
1776                                         size_t matchlen = (size_t)(next - split);
1777
1778                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1779                                         if (match)
1780                                                 break;
1781                                 } else {
1782                                         match = (strcmp(split, val) == 0);
1783                                         break;
1784                                 }
1785                                 split = &next[1];
1786                         }
1787                         break;
1788                 }
1789         case GL_SPLIT_GLOB:
1790                 {
1791                         char value[UTIL_PATH_SIZE];
1792
1793                         util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value));
1794                         key_value = value;
1795                         while (key_value != NULL) {
1796                                 pos = strchr(key_value, '|');
1797                                 if (pos != NULL) {
1798                                         pos[0] = '\0';
1799                                         pos = &pos[1];
1800                                 }
1801                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str[token->type], key_value, val);
1802                                 match = (fnmatch(key_value, val, 0) == 0);
1803                                 if (match)
1804                                         break;
1805                                 key_value = pos;
1806                         }
1807                         break;
1808                 }
1809         case GL_SOMETHING:
1810                 match = (val[0] != '\0');
1811                 break;
1812         case GL_FORMAT:
1813         case GL_UNSET:
1814                 return -1;
1815         }
1816
1817         if (match && (token->key.op == OP_MATCH)) {
1818                 dbg(rules->udev, "%s is true (matching value)\n", token_str[token->type]);
1819                 return 0;
1820         }
1821         if (!match && (token->key.op == OP_NOMATCH)) {
1822                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str[token->type]);
1823                 return 0;
1824         }
1825         dbg(rules->udev, "%s is not true\n", token_str[token->type]);
1826         return -1;
1827 }
1828
1829 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1830 {
1831         const char *key_name = &rules->buf[cur->key.attr_off];
1832         const char *key_value = &rules->buf[cur->key.value_off];
1833         char value[UTIL_NAME_SIZE];
1834         size_t len;
1835
1836         value[0] = '\0';
1837         if (key_name[0] == '[') {
1838                 char attr[UTIL_PATH_SIZE];
1839
1840                 util_strlcpy(attr, key_name, sizeof(attr));
1841                 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
1842         }
1843         if (value[0] == '\0') {
1844                 const char *val;
1845
1846                 val = udev_device_get_sysattr_value(dev, key_name);
1847                 if (val == NULL)
1848                         return -1;
1849                 util_strlcpy(value, val, sizeof(value));
1850         }
1851
1852         /* strip trailing whitespace of value, if not asked to match for it */
1853         len = strlen(key_value);
1854         if (len > 0 && !isspace(key_value[len-1])) {
1855                 len = strlen(value);
1856                 while (len > 0 && isspace(value[--len]))
1857                         value[len] = '\0';
1858                 dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
1859         }
1860         return match_key(rules, cur, value);
1861 }
1862
1863 enum escape_type {
1864         ESCAPE_UNSET,
1865         ESCAPE_NONE,
1866         ESCAPE_REPLACE,
1867 };
1868
1869 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
1870 {
1871         struct token *cur;
1872         struct token *rule;
1873         enum escape_type esc = ESCAPE_UNSET;
1874         int can_set_name;
1875
1876         if (rules->tokens == NULL)
1877                 return -1;
1878
1879         can_set_name = ((strcmp(udev_device_get_action(event->dev), "add") == 0 ||
1880                          strcmp(udev_device_get_action(event->dev), "change") == 0) &&
1881                         (major(udev_device_get_devnum(event->dev)) > 0 ||
1882                          strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
1883
1884         /* loop through token list, match, run actions or forward to next rule */
1885         cur = &rules->tokens[0];
1886         rule = cur;
1887         while (1) {
1888                 unsigned int idx;
1889
1890                 dump_token(rules, cur);
1891                 switch (cur->type) {
1892                 case TK_RULE:
1893                         /* current rule */
1894                         rule = cur;
1895                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1896                         if (!can_set_name && rule->rule.flags)
1897                                 ;//goto nomatch;
1898                         esc = ESCAPE_UNSET;
1899                         break;
1900                 case TK_M_ACTION:
1901                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1902                                 goto nomatch;
1903                         break;
1904                 case TK_M_DEVPATH:
1905                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1906                                 goto nomatch;
1907                         break;
1908                 case TK_M_KERNEL:
1909                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1910                                 goto nomatch;
1911                         break;
1912                 case TK_M_DEVLINK:
1913                         {
1914                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
1915                                 struct udev_list_entry *list_entry;
1916                                 int match = 0;
1917
1918                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1919                                         const char *devlink;
1920
1921                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
1922                                         if (match_key(rules, cur, devlink) == 0) {
1923                                                 match = 1;
1924                                                 break;
1925                                         }
1926                                 }
1927                                 if (!match)
1928                                         goto nomatch;
1929                                 break;
1930                         }
1931                 case TK_M_NAME:
1932                         if (match_key(rules, cur, event->name) != 0)
1933                                 goto nomatch;
1934                         break;
1935                 case TK_M_ENV:
1936                         {
1937                                 struct udev_list_entry *list_entry;
1938                                 const char *key_name = &rules->buf[cur->key.attr_off];
1939                                 const char *value;
1940
1941                                 list_entry = udev_device_get_properties_list_entry(event->dev);
1942                                 list_entry = udev_list_entry_get_by_name(list_entry, key_name);
1943                                 value = udev_list_entry_get_value(list_entry);
1944                                 if (value == NULL) {
1945                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
1946                                         value = "";
1947                                 }
1948                                 if (match_key(rules, cur, value))
1949                                         goto nomatch;
1950                                 break;
1951                         }
1952                 case TK_M_SUBSYSTEM:
1953                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1954                                 goto nomatch;
1955                         break;
1956                 case TK_M_DRIVER:
1957                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1958                                 goto nomatch;
1959                         break;
1960                 case TK_M_WAITFOR:
1961                         {
1962                                 char filename[UTIL_PATH_SIZE];
1963                                 int found;
1964
1965                                 util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename));
1966                                 udev_event_apply_format(event, filename, sizeof(filename));
1967                                 found = (wait_for_file(event->dev, filename, 10) == 0);
1968                                 if (!found && (cur->key.op != OP_NOMATCH))
1969                                         goto nomatch;
1970                                 break;
1971                         }
1972                 case TK_M_ATTR:
1973                         if (match_attr(rules, event->dev, event, cur) != 0)
1974                                 goto nomatch;
1975                         break;
1976                 case TK_M_KERNELS:
1977                 case TK_M_SUBSYSTEMS:
1978                 case TK_M_DRIVERS:
1979                 case TK_M_ATTRS:
1980                         {
1981                                 struct token *next;
1982
1983                                 /* get whole sequence of parent matches */
1984                                 next = cur;
1985                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1986                                         next++;
1987
1988                                 /* loop over parents */
1989                                 event->dev_parent = event->dev;
1990                                 while (1) {
1991                                         struct token *key;
1992
1993                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
1994                                         /* loop over sequence of parent match keys */
1995                                         for (key = cur; key < next; key++ ) {
1996                                                 dump_token(rules, key);
1997                                                 switch(key->type) {
1998                                                 case TK_M_KERNELS:
1999                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2000                                                                 goto try_parent;
2001                                                         break;
2002                                                 case TK_M_SUBSYSTEMS:
2003                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2004                                                                 goto try_parent;
2005                                                         break;
2006                                                 case TK_M_DRIVERS:
2007                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2008                                                                 goto try_parent;
2009                                                         break;
2010                                                 case TK_M_ATTRS:
2011                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2012                                                                 goto try_parent;
2013                                                         break;
2014                                                 default:
2015                                                         goto nomatch;
2016                                                 }
2017                                                 dbg(event->udev, "parent key matched\n");
2018                                         }
2019                                         dbg(event->udev, "all parent keys matched\n");
2020                                         /* all keys matched */
2021                                         break;
2022
2023                                 try_parent:
2024                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2025                                         if (event->dev_parent == NULL)
2026                                                 goto nomatch;
2027                                 }
2028                                 /* move behind our sequence of parent match keys */
2029                                 cur = next;
2030                                 continue;
2031                         }
2032                 case TK_M_TEST:
2033                         {
2034                                 char filename[UTIL_PATH_SIZE];
2035                                 struct stat statbuf;
2036                                 int match;
2037
2038                                 util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename));
2039                                 udev_event_apply_format(event, filename, sizeof(filename));
2040                                 if (util_resolve_subsys_kernel(event->udev, NULL, filename, sizeof(filename), 0) != 0)
2041                                         if (filename[0] != '/') {
2042                                                 char tmp[UTIL_PATH_SIZE];
2043
2044                                                 util_strlcpy(tmp, udev_device_get_syspath(event->dev), sizeof(tmp));
2045                                                 util_strlcat(tmp, "/", sizeof(tmp));
2046                                                 util_strlcat(tmp, filename, sizeof(tmp));
2047                                                 util_strlcpy(filename, tmp, sizeof(filename));
2048                                         }
2049
2050                                 attr_subst_subdir(filename, sizeof(filename));
2051
2052                                 match = (stat(filename, &statbuf) == 0);
2053                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2054                                 if (match && cur->key.mode > 0) {
2055                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2056                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2057                                             match ? "matches" : "does not match", cur->key.mode);
2058                                 }
2059                                 if (match && cur->key.op == OP_NOMATCH)
2060                                         goto nomatch;
2061                                 if (!match && cur->key.op == OP_MATCH)
2062                                         goto nomatch;
2063                                 break;
2064                         }
2065                 case TK_M_PROGRAM:
2066                         {
2067                                 char program[UTIL_PATH_SIZE];
2068                                 char **envp;
2069                                 char result[UTIL_PATH_SIZE];
2070
2071                                 free(event->program_result);
2072                                 event->program_result = NULL;
2073                                 util_strlcpy(program, &rules->buf[cur->key.value_off], sizeof(program));
2074                                 udev_event_apply_format(event, program, sizeof(program));
2075                                 envp = udev_device_get_properties_envp(event->dev);
2076                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2077                                      program,
2078                                      &rules->buf[rule->rule.filename_off],
2079                                      rule->rule.filename_line);
2080                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL) != 0) {
2081                                         if (cur->key.op != OP_NOMATCH)
2082                                                 goto nomatch;
2083                                 } else {
2084                                         int count;
2085
2086                                         util_remove_trailing_chars(result, '\n');
2087                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2088                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2089                                                 if (count > 0)
2090                                                         info(event->udev, "%i character(s) replaced\n" , count);
2091                                         }
2092                                         event->program_result = strdup(result);
2093                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2094                                         if (cur->key.op == OP_NOMATCH)
2095                                                 goto nomatch;
2096                                 }
2097                                 break;
2098                         }
2099                 case TK_M_IMPORT_FILE:
2100                         {
2101                                 char import[UTIL_PATH_SIZE];
2102
2103                                 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2104                                 udev_event_apply_format(event, import, sizeof(import));
2105                                 if (import_file_into_properties(event->dev, import) != 0)
2106                                         if (cur->key.op != OP_NOMATCH)
2107                                                 goto nomatch;
2108                                 break;
2109                         }
2110                 case TK_M_IMPORT_PROG:
2111                         {
2112                                 char import[UTIL_PATH_SIZE];
2113
2114                                 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2115                                 udev_event_apply_format(event, import, sizeof(import));
2116                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2117                                      import,
2118                                      &rules->buf[rule->rule.filename_off],
2119                                      rule->rule.filename_line);
2120                                 if (import_program_into_properties(event->dev, import) != 0)
2121                                         if (cur->key.op != OP_NOMATCH)
2122                                                 goto nomatch;
2123                                 break;
2124                         }
2125                 case TK_M_IMPORT_PARENT:
2126                         {
2127                                 char import[UTIL_PATH_SIZE];
2128
2129                                 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2130                                 udev_event_apply_format(event, import, sizeof(import));
2131                                 if (import_parent_into_properties(event->dev, import) != 0)
2132                                         if (cur->key.op != OP_NOMATCH)
2133                                                 goto nomatch;
2134                                 break;
2135                         }
2136                 case TK_M_RESULT:
2137                         if (match_key(rules, cur, event->program_result) != 0)
2138                                 goto nomatch;
2139                         break;
2140
2141                 case TK_A_IGNORE_DEVICE:
2142                         event->ignore_device = 1;
2143                         return 0;
2144                         break;
2145                 case TK_A_STRING_ESCAPE_NONE:
2146                         esc = ESCAPE_NONE;
2147                         break;
2148                 case TK_A_STRING_ESCAPE_REPLACE:
2149                         esc = ESCAPE_REPLACE;
2150                         break;
2151                 case TK_A_NUM_FAKE_PART:
2152                         if (strcmp(udev_device_get_subsystem(event->dev), "block") != 0)
2153                                 break;
2154                         if (udev_device_get_sysnum(event->dev) != NULL)
2155                                 break;
2156                         udev_device_set_num_fake_partitions(event->dev, cur->key.num_fake_part);
2157                         break;
2158                 case TK_A_DEVLINK_PRIO:
2159                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2160                         break;
2161                 case TK_A_OWNER:
2162                         {
2163                                 char owner[UTIL_NAME_SIZE];
2164
2165                                 if (event->owner_final)
2166                                         break;
2167                                 if (cur->key.op == OP_ASSIGN_FINAL)
2168                                         event->owner_final = 1;
2169                                 util_strlcpy(owner,  &rules->buf[cur->key.value_off], sizeof(owner));
2170                                 udev_event_apply_format(event, owner, sizeof(owner));
2171                                 event->uid = util_lookup_user(event->udev, owner);
2172                                 info(event->udev, "OWNER %u %s:%u\n",
2173                                      event->uid,
2174                                      &rules->buf[rule->rule.filename_off],
2175                                      rule->rule.filename_line);
2176                                 break;
2177                         }
2178                 case TK_A_GROUP:
2179                         {
2180                                 char group[UTIL_NAME_SIZE];
2181
2182                                 if (event->group_final)
2183                                         break;
2184                                 if (cur->key.op == OP_ASSIGN_FINAL)
2185                                         event->group_final = 1;
2186                                 util_strlcpy(group, &rules->buf[cur->key.value_off], sizeof(group));
2187                                 udev_event_apply_format(event, group, sizeof(group));
2188                                 event->gid = util_lookup_group(event->udev, group);
2189                                 info(event->udev, "GROUP %u %s:%u\n",
2190                                      event->gid,
2191                                      &rules->buf[rule->rule.filename_off],
2192                                      rule->rule.filename_line);
2193                                 break;
2194                         }
2195                 case TK_A_MODE:
2196                         {
2197                                 char mode[UTIL_NAME_SIZE];
2198                                 char *endptr;
2199
2200                                 if (event->mode_final)
2201                                         break;
2202                                 if (cur->key.op == OP_ASSIGN_FINAL)
2203                                         event->mode_final = 1;
2204                                 util_strlcpy(mode, &rules->buf[cur->key.value_off], sizeof(mode));
2205                                 udev_event_apply_format(event, mode, sizeof(mode));
2206                                 event->mode = strtol(mode, &endptr, 8);
2207                                 if (endptr[0] != '\0') {
2208                                         err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2209                                         event->mode = 0660;
2210                                 }
2211                                 info(event->udev, "MODE %#o %s:%u\n",
2212                                      event->mode,
2213                                      &rules->buf[rule->rule.filename_off],
2214                                      rule->rule.filename_line);
2215                                 break;
2216                         }
2217                 case TK_A_OWNER_ID:
2218                         if (event->owner_final)
2219                                 break;
2220                         if (cur->key.op == OP_ASSIGN_FINAL)
2221                                 event->owner_final = 1;
2222                         event->uid = cur->key.uid;
2223                         info(event->udev, "OWNER %u %s:%u\n",
2224                              event->uid,
2225                              &rules->buf[rule->rule.filename_off],
2226                              rule->rule.filename_line);
2227                         break;
2228                 case TK_A_GROUP_ID:
2229                         if (event->group_final)
2230                                 break;
2231                         if (cur->key.op == OP_ASSIGN_FINAL)
2232                                 event->group_final = 1;
2233                         event->gid = cur->key.gid;
2234                         info(event->udev, "GROUP %u %s:%u\n",
2235                              event->gid,
2236                              &rules->buf[rule->rule.filename_off],
2237                              rule->rule.filename_line);
2238                         break;
2239                 case TK_A_MODE_ID:
2240                         if (event->mode_final)
2241                                 break;
2242                         if (cur->key.op == OP_ASSIGN_FINAL)
2243                                 event->mode_final = 1;
2244                         event->mode = cur->key.mode;
2245                         info(event->udev, "MODE %#o %s:%u\n",
2246                              event->mode,
2247                              &rules->buf[rule->rule.filename_off],
2248                              rule->rule.filename_line);
2249                         break;
2250                 case TK_A_ENV:
2251                         {
2252                                 const char *name = &rules->buf[cur->key.attr_off];
2253                                 char *value = &rules->buf[cur->key.value_off];
2254
2255                                 if (value[0] != '\0') {
2256                                         char temp_value[UTIL_NAME_SIZE];
2257                                         struct udev_list_entry *entry;
2258
2259                                         util_strlcpy(temp_value, value, sizeof(temp_value));
2260                                         udev_event_apply_format(event, temp_value, sizeof(temp_value));
2261                                         entry = udev_device_add_property(event->dev, name, temp_value);
2262                                         /* store in db */
2263                                         udev_list_entry_set_flag(entry, 1);
2264                                 } else {
2265                                         udev_device_add_property(event->dev, name, NULL);
2266                                 }
2267                                 break;
2268                         }
2269                 case TK_A_NAME:
2270                         {
2271                                 const char *name  = &rules->buf[cur->key.value_off];
2272                                 char name_str[UTIL_PATH_SIZE];
2273                                 int count;
2274
2275                                 if (event->name_final)
2276                                         break;
2277                                 if (cur->key.op == OP_ASSIGN_FINAL)
2278                                         event->name_final = 1;
2279                                 if (name[0] == '\0') {
2280                                         free(event->name);
2281                                         event->name = NULL;
2282                                         break;
2283                                 }
2284                                 util_strlcpy(name_str, name, sizeof(name_str));
2285                                 udev_event_apply_format(event, name_str, sizeof(name_str));
2286                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2287                                         count = udev_util_replace_chars(name_str, "/");
2288                                         if (count > 0)
2289                                                 info(event->udev, "%i character(s) replaced\n", count);
2290                                         free(event->name);
2291                                         event->name = strdup(name_str);
2292                                         info(event->udev, "NAME '%s' %s:%u\n",
2293                                              event->name,
2294                                              &rules->buf[rule->rule.filename_off],
2295                                              rule->rule.filename_line);
2296                                 }
2297                                 break;
2298                         }
2299                 case TK_A_DEVLINK:
2300                         {
2301                                 char temp[UTIL_PATH_SIZE];
2302                                 char filename[UTIL_PATH_SIZE];
2303                                 char *pos, *next;
2304                                 int count = 0;
2305
2306                                 if (event->devlink_final)
2307                                         break;
2308                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2309                                         break;
2310                                 if (cur->key.op == OP_ASSIGN_FINAL)
2311                                         event->devlink_final = 1;
2312                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2313                                         udev_device_cleanup_devlinks_list(event->dev);
2314
2315                                 /* allow  multiple symlinks separated by spaces */
2316                                 util_strlcpy(temp, &rules->buf[cur->key.value_off], sizeof(temp));
2317                                 udev_event_apply_format(event, temp, sizeof(temp));
2318                                 if (esc == ESCAPE_UNSET)
2319                                         count = udev_util_replace_chars(temp, "/ ");
2320                                 else if (esc == ESCAPE_REPLACE)
2321                                         count = udev_util_replace_chars(temp, "/");
2322                                 if (count > 0)
2323                                         info(event->udev, "%i character(s) replaced\n" , count);
2324                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2325                                 pos = temp;
2326                                 while (isspace(pos[0]))
2327                                         pos++;
2328                                 next = strchr(pos, ' ');
2329                                 while (next) {
2330                                         next[0] = '\0';
2331                                         info(event->udev, "LINK '%s' %s:%u\n",
2332                                              pos,
2333                                              &rules->buf[rule->rule.filename_off],
2334                                              rule->rule.filename_line);
2335                                         util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
2336                                         util_strlcat(filename, "/", sizeof(filename));
2337                                         util_strlcat(filename, pos, sizeof(filename));
2338                                         udev_device_add_devlink(event->dev, filename);
2339                                         while (isspace(next[1]))
2340                                                 next++;
2341                                         pos = &next[1];
2342                                         next = strchr(pos, ' ');
2343                                 }
2344                                 if (pos[0] != '\0') {
2345                                         info(event->udev, "LINK '%s' %s:%u\n",
2346                                              pos,
2347                                              &rules->buf[rule->rule.filename_off],
2348                                              rule->rule.filename_line);
2349                                         util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
2350                                         util_strlcat(filename, "/", sizeof(filename));
2351                                         util_strlcat(filename, pos, sizeof(filename));
2352                                         udev_device_add_devlink(event->dev, filename);
2353                                 }
2354                         }
2355                         break;
2356                 case TK_A_EVENT_TIMEOUT:
2357                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2358                         break;
2359                 case TK_A_IGNORE_REMOVE:
2360                         udev_device_set_ignore_remove(event->dev, 1);
2361                         break;
2362                 case TK_A_ATTR:
2363                         {
2364                                 const char *key_name = &rules->buf[cur->key.attr_off];
2365                                 char attr[UTIL_PATH_SIZE];
2366                                 char value[UTIL_NAME_SIZE];
2367                                 FILE *f;
2368
2369                                 util_strlcpy(attr, key_name, sizeof(attr));
2370                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0) {
2371                                         util_strlcpy(attr, udev_device_get_syspath(event->dev), sizeof(attr));
2372                                         util_strlcat(attr, "/", sizeof(attr));
2373                                         util_strlcat(attr, key_name, sizeof(attr));
2374                                 }
2375
2376                                 attr_subst_subdir(attr, sizeof(attr));
2377
2378                                 util_strlcpy(value, &rules->buf[cur->key.value_off], sizeof(value));
2379                                 udev_event_apply_format(event, value, sizeof(value));
2380                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2381                                      &rules->buf[rule->rule.filename_off],
2382                                      rule->rule.filename_line);
2383                                 f = fopen(attr, "w");
2384                                 if (f != NULL) {
2385                                         if (!event->test)
2386                                                 if (fprintf(f, "%s", value) <= 0)
2387                                                         err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2388                                         fclose(f);
2389                                 } else {
2390                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2391                                 }
2392                                 break;
2393                         }
2394                 case TK_A_RUN:
2395                         {
2396                                 struct udev_list_entry *list_entry;
2397
2398                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2399                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2400                                 info(event->udev, "RUN '%s' %s:%u\n",
2401                                      &rules->buf[cur->key.value_off],
2402                                      &rules->buf[rule->rule.filename_off],
2403                                      rule->rule.filename_line);
2404                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2405                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2406                                 if (cur->key.ignore_error)
2407                                         udev_list_entry_set_flag(list_entry, 1);
2408                                 break;
2409                         }
2410                 case TK_A_GOTO:
2411                         cur = &rules->tokens[cur->key.rule_goto];
2412                         continue;
2413                 case TK_A_LAST_RULE:
2414                 case TK_END:
2415                         return 0;
2416
2417                 case TK_M_PARENTS_MIN:
2418                 case TK_M_PARENTS_MAX:
2419                 case TK_M_MAX:
2420                 case TK_UNSET:
2421                         err(rules->udev, "wrong type %u\n", cur->type);
2422                         goto nomatch;
2423                 }
2424
2425                 cur++;
2426                 continue;
2427         nomatch:
2428                 /* fast-forward to next rule */
2429                 idx = rule->rule.next_rule;
2430                 if (idx == 0)
2431                         return 0;
2432                 dbg(rules->udev, "forward to rule: %u\n", idx);
2433                 cur = &rules->tokens[idx];
2434         }
2435 }