udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN                  2048
  36 #define PREALLOC_STRBUF                 32 * 1024
  37 #define PREALLOC_TRIE                   256
  38
  39 struct uid_gid {
  40         unsigned int name_off;
  41         union {
  42                 uid_t   uid;
  43                 gid_t   gid;
  44         };
  45 };
  46
  47 struct trie_node {
  48         /* this node's first child */
  49         unsigned int child_idx;
  50         /* the next child of our parent node's child list */
  51         unsigned int next_child_idx;
  52         /* this node's last child (shortcut for append) */
  53         unsigned int last_child_idx;
  54         unsigned int value_off;
  55         unsigned short value_len;
  56         unsigned char key;
  57 };
  58
  59 struct udev_rules {
  60         struct udev *udev;
  61         int resolve_names;
  62
  63         /* every key in the rules file becomes a token */
  64         struct token *tokens;
  65         unsigned int token_cur;
  66         unsigned int token_max;
  67
  68         /* all key strings are copied to a single string buffer */
  69         char *buf;
  70         size_t buf_cur;
  71         size_t buf_max;
  72         unsigned int buf_count;
  73
  74         /* during rule parsing, strings are indexed to find duplicates */
  75         struct trie_node *trie_nodes;
  76         unsigned int trie_nodes_cur;
  77         unsigned int trie_nodes_max;
  78
  79         /* during rule parsing, uid/gid lookup results are cached */
  80         struct uid_gid *uids;
  81         unsigned int uids_cur;
  82         unsigned int uids_max;
  83         struct uid_gid *gids;
  84         unsigned int gids_cur;
  85         unsigned int gids_max;
  86 };
  87
  88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  89 enum operation_type {
  90         OP_UNSET,
  91
  92         OP_MATCH,
  93         OP_NOMATCH,
  94         OP_MATCH_MAX,
  95
  96         OP_ADD,
  97         OP_ASSIGN,
  98         OP_ASSIGN_FINAL,
  99 };
 100
 101 enum string_glob_type {
 102         GL_UNSET,
 103         GL_PLAIN,                       /* no special chars */
 104         GL_GLOB,                        /* shell globs ?,*,[] */
 105         GL_SPLIT,                       /* multi-value A|B */
 106         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 107         GL_SOMETHING,                   /* commonly used "?*" */
 108 };
 109
 110 enum string_subst_type {
 111         SB_UNSET,
 112         SB_NONE,
 113         SB_FORMAT,
 114         SB_SUBSYS,
 115 };
 116
 117 /* tokens of a rule are sorted/handled in this order */
 118 enum token_type {
 119         TK_UNSET,
 120         TK_RULE,
 121
 122         TK_M_ACTION,                    /* val */
 123         TK_M_DEVPATH,                   /* val */
 124         TK_M_KERNEL,                    /* val */
 125         TK_M_DEVLINK,                   /* val */
 126         TK_M_NAME,                      /* val */
 127         TK_M_ENV,                       /* val, attr */
 128         TK_M_SUBSYSTEM,                 /* val */
 129         TK_M_DRIVER,                    /* val */
 130         TK_M_WAITFOR,                   /* val */
 131         TK_M_ATTR,                      /* val, attr */
 132
 133         TK_M_PARENTS_MIN,
 134         TK_M_KERNELS,                   /* val */
 135         TK_M_SUBSYSTEMS,                /* val */
 136         TK_M_DRIVERS,                   /* val */
 137         TK_M_ATTRS,                     /* val, attr */
 138         TK_M_PARENTS_MAX,
 139
 140         TK_M_TEST,                      /* val, mode_t */
 141         TK_M_PROGRAM,                   /* val */
 142         TK_M_IMPORT_FILE,               /* val */
 143         TK_M_IMPORT_PROG,               /* val */
 144         TK_M_IMPORT_DB,                 /* val */
 145         TK_M_IMPORT_PARENT,             /* val */
 146         TK_M_RESULT,                    /* val */
 147         TK_M_MAX,
 148
 149         TK_A_STRING_ESCAPE_NONE,
 150         TK_A_STRING_ESCAPE_REPLACE,
 151         TK_A_INOTIFY_WATCH,             /* int */
 152         TK_A_NUM_FAKE_PART,             /* int */
 153         TK_A_DEVLINK_PRIO,              /* int */
 154         TK_A_OWNER,                     /* val */
 155         TK_A_GROUP,                     /* val */
 156         TK_A_MODE,                      /* val */
 157         TK_A_OWNER_ID,                  /* uid_t */
 158         TK_A_GROUP_ID,                  /* gid_t */
 159         TK_A_MODE_ID,                   /* mode_t */
 160         TK_A_ENV,                       /* val, attr */
 161         TK_A_NAME,                      /* val */
 162         TK_A_DEVLINK,                   /* val */
 163         TK_A_EVENT_TIMEOUT,             /* int */
 164         TK_A_IGNORE_REMOVE,
 165         TK_A_ATTR,                      /* val, attr */
 166         TK_A_RUN,                       /* val, bool */
 167         TK_A_GOTO,                      /* size_t */
 168
 169         TK_END,
 170 };
 171
 172 /* we try to pack stuff in a way that we take only 12 bytes per token */
 173 struct token {
 174         union {
 175                 unsigned char type;             /* same as in rule and key */
 176                 struct {
 177                         enum token_type type:8;
 178                         unsigned int flags:8;
 179                         unsigned short token_count;
 180                         unsigned int label_off;
 181                         unsigned short filename_off;
 182                         unsigned short filename_line;
 183                 } rule;
 184                 struct {
 185                         enum token_type type:8;
 186                         enum operation_type op:8;
 187                         enum string_glob_type glob:8;
 188                         enum string_subst_type subst:4;
 189                         enum string_subst_type attrsubst:4;
 190                         unsigned int value_off;
 191                         union {
 192                                 unsigned int attr_off;
 193                                 int devlink_unique;
 194                                 int fail_on_error;
 195                                 unsigned int rule_goto;
 196                                 mode_t  mode;
 197                                 uid_t uid;
 198                                 gid_t gid;
 199                                 int devlink_prio;
 200                                 int event_timeout;
 201                                 int watch;
 202                         };
 203                 } key;
 204         };
 205 };
 206
 207 #define MAX_TK          64
 208 struct rule_tmp {
 209         struct udev_rules *rules;
 210         struct token rule;
 211         struct token token[MAX_TK];
 212         unsigned int token_cur;
 213 };
 214
 215 #ifdef ENABLE_DEBUG
 216 static const char *operation_str(enum operation_type type)
 217 {
 218         static const char *operation_strs[] = {
 219                 [OP_UNSET] =            "UNSET",
 220                 [OP_MATCH] =            "match",
 221                 [OP_NOMATCH] =          "nomatch",
 222                 [OP_MATCH_MAX] =        "MATCH_MAX",
 223
 224                 [OP_ADD] =              "add",
 225                 [OP_ASSIGN] =           "assign",
 226                 [OP_ASSIGN_FINAL] =     "assign-final",
 227 }       ;
 228
 229         return operation_strs[type];
 230 }
 231
 232 static const char *string_glob_str(enum string_glob_type type)
 233 {
 234         static const char *string_glob_strs[] = {
 235                 [GL_UNSET] =            "UNSET",
 236                 [GL_PLAIN] =            "plain",
 237                 [GL_GLOB] =             "glob",
 238                 [GL_SPLIT] =            "split",
 239                 [GL_SPLIT_GLOB] =       "split-glob",
 240                 [GL_SOMETHING] =        "split-glob",
 241         };
 242
 243         return string_glob_strs[type];
 244 }
 245
 246 static const char *token_str(enum token_type type)
 247 {
 248         static const char *token_strs[] = {
 249                 [TK_UNSET] =                    "UNSET",
 250                 [TK_RULE] =                     "RULE",
 251
 252                 [TK_M_ACTION] =                 "M ACTION",
 253                 [TK_M_DEVPATH] =                "M DEVPATH",
 254                 [TK_M_KERNEL] =                 "M KERNEL",
 255                 [TK_M_DEVLINK] =                "M DEVLINK",
 256                 [TK_M_NAME] =                   "M NAME",
 257                 [TK_M_ENV] =                    "M ENV",
 258                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 259                 [TK_M_DRIVER] =                 "M DRIVER",
 260                 [TK_M_WAITFOR] =                "M WAITFOR",
 261                 [TK_M_ATTR] =                   "M ATTR",
 262
 263                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 264                 [TK_M_KERNELS] =                "M KERNELS",
 265                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 266                 [TK_M_DRIVERS] =                "M DRIVERS",
 267                 [TK_M_ATTRS] =                  "M ATTRS",
 268                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 269
 270                 [TK_M_TEST] =                   "M TEST",
 271                 [TK_M_PROGRAM] =                "M PROGRAM",
 272                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 273                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 274                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 275                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 276                 [TK_M_RESULT] =                 "M RESULT",
 277                 [TK_M_MAX] =                    "M MAX",
 278
 279                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 280                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 281                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 282                 [TK_A_NUM_FAKE_PART] =          "A NUM_FAKE_PART",
 283                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 284                 [TK_A_OWNER] =                  "A OWNER",
 285                 [TK_A_GROUP] =                  "A GROUP",
 286                 [TK_A_MODE] =                   "A MODE",
 287                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 288                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 289                 [TK_A_MODE_ID] =                "A MODE_ID",
 290                 [TK_A_ENV] =                    "A ENV",
 291                 [TK_A_NAME] =                   "A NAME",
 292                 [TK_A_DEVLINK] =                "A DEVLINK",
 293                 [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 294                 [TK_A_IGNORE_REMOVE] =          "A IGNORE_REMOVE",
 295                 [TK_A_ATTR] =                   "A ATTR",
 296                 [TK_A_RUN] =                    "A RUN",
 297                 [TK_A_GOTO] =                   "A GOTO",
 298
 299                 [TK_END] =                      "END",
 300         };
 301
 302         return token_strs[type];
 303 }
 304
 305 static void dump_token(struct udev_rules *rules, struct token *token)
 306 {
 307         enum token_type type = token->type;
 308         enum operation_type op = token->key.op;
 309         enum string_glob_type glob = token->key.glob;
 310         const char *value = &rules->buf[token->key.value_off];
 311         const char *attr = &rules->buf[token->key.attr_off];
 312
 313         switch (type) {
 314         case TK_RULE:
 315                 {
 316                         const char *tks_ptr = (char *)rules->tokens;
 317                         const char *tk_ptr = (char *)token;
 318                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 319
 320                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s', flags: 0x%02x\n",
 321                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 322                             idx, token->rule.token_count,
 323                             &rules->buf[token->rule.label_off],
 324                             token->rule.flags);
 325                         break;
 326                 }
 327         case TK_M_ACTION:
 328         case TK_M_DEVPATH:
 329         case TK_M_KERNEL:
 330         case TK_M_SUBSYSTEM:
 331         case TK_M_DRIVER:
 332         case TK_M_WAITFOR:
 333         case TK_M_DEVLINK:
 334         case TK_M_NAME:
 335         case TK_M_KERNELS:
 336         case TK_M_SUBSYSTEMS:
 337         case TK_M_DRIVERS:
 338         case TK_M_PROGRAM:
 339         case TK_M_IMPORT_FILE:
 340         case TK_M_IMPORT_PROG:
 341         case TK_M_IMPORT_DB:
 342         case TK_M_IMPORT_PARENT:
 343         case TK_M_RESULT:
 344         case TK_A_NAME:
 345         case TK_A_DEVLINK:
 346         case TK_A_OWNER:
 347         case TK_A_GROUP:
 348         case TK_A_MODE:
 349         case TK_A_RUN:
 350                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 351                     token_str(type), operation_str(op), value, string_glob_str(glob));
 352                 break;
 353         case TK_M_ATTR:
 354         case TK_M_ATTRS:
 355         case TK_M_ENV:
 356         case TK_A_ATTR:
 357         case TK_A_ENV:
 358                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 359                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 360                 break;
 361         case TK_A_STRING_ESCAPE_NONE:
 362         case TK_A_STRING_ESCAPE_REPLACE:
 363         case TK_A_IGNORE_REMOVE:
 364                 dbg(rules->udev, "%s\n", token_str(type));
 365                 break;
 366         case TK_M_TEST:
 367                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 368                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 369                 break;
 370         case TK_A_INOTIFY_WATCH:
 371                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 372                 break;
 373         case TK_A_DEVLINK_PRIO:
 374                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.devlink_prio);
 375                 break;
 376         case TK_A_OWNER_ID:
 377                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 378                 break;
 379         case TK_A_GROUP_ID:
 380                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 381                 break;
 382         case TK_A_MODE_ID:
 383                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 384                 break;
 385         case TK_A_EVENT_TIMEOUT:
 386                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.event_timeout);
 387                 break;
 388         case TK_A_GOTO:
 389                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 390                 break;
 391         case TK_END:
 392                 dbg(rules->udev, "* %s\n", token_str(type));
 393                 break;
 394         case TK_M_PARENTS_MIN:
 395         case TK_M_PARENTS_MAX:
 396         case TK_M_MAX:
 397         case TK_UNSET:
 398                 dbg(rules->udev, "unknown type %u\n", type);
 399                 break;
 400         }
 401 }
 402
 403 static void dump_rules(struct udev_rules *rules)
 404 {
 405         unsigned int i;
 406
 407         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 408             rules->token_cur,
 409             rules->token_cur * sizeof(struct token),
 410             rules->buf_count,
 411             rules->buf_cur);
 412         for(i = 0; i < rules->token_cur; i++)
 413                 dump_token(rules, &rules->tokens[i]);
 414 }
 415 #else
 416 static inline const char *operation_str(enum operation_type type) { return NULL; }
 417 static inline const char *token_str(enum token_type type) { return NULL; }
 418 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 419 static inline void dump_rules(struct udev_rules *rules) {}
 420 #endif /* ENABLE_DEBUG */
 421
 422 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 423 {
 424         int off;
 425
 426         /* grow buffer if needed */
 427         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 428                 char *buf;
 429                 unsigned int add;
 430
 431                 /* double the buffer size */
 432                 add = rules->buf_max;
 433                 if (add < bytes * 8)
 434                         add = bytes * 8;
 435
 436                 buf = realloc(rules->buf, rules->buf_max + add);
 437                 if (buf == NULL)
 438                         return -1;
 439                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 440                 rules->buf = buf;
 441                 rules->buf_max += add;
 442         }
 443         off = rules->buf_cur;
 444         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 445         rules->buf_cur += bytes;
 446         rules->buf_count++;
 447         return off;
 448 }
 449
 450 static int add_string(struct udev_rules *rules, const char *str)
 451 {
 452         unsigned int node_idx;
 453         struct trie_node *new_node;
 454         unsigned int new_node_idx;
 455         unsigned char key;
 456         unsigned short len;
 457         unsigned int depth;
 458         unsigned int off;
 459         struct trie_node *parent;
 460
 461         /* walk trie, start from last character of str to find matching tails */
 462         len = strlen(str);
 463         key = str[len-1];
 464         node_idx = 0;
 465         for (depth = 0; depth <= len; depth++) {
 466                 struct trie_node *node;
 467                 unsigned int child_idx;
 468
 469                 node = &rules->trie_nodes[node_idx];
 470                 off = node->value_off + node->value_len - len;
 471
 472                 /* match against current node */
 473                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 474                         return off;
 475
 476                 /* lookup child node */
 477                 key = str[len - 1 - depth];
 478                 child_idx = node->child_idx;
 479                 while (child_idx > 0) {
 480                         struct trie_node *child;
 481
 482                         child = &rules->trie_nodes[child_idx];
 483                         if (child->key == key)
 484                                 break;
 485                         child_idx = child->next_child_idx;
 486                 }
 487                 if (child_idx == 0)
 488                         break;
 489                 node_idx = child_idx;
 490         }
 491
 492         /* string not found, add it */
 493         off = add_new_string(rules, str, len + 1);
 494
 495         /* grow trie nodes if needed */
 496         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 497                 struct trie_node *nodes;
 498                 unsigned int add;
 499
 500                 /* double the buffer size */
 501                 add = rules->trie_nodes_max;
 502                 if (add < 8)
 503                         add = 8;
 504
 505                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 506                 if (nodes == NULL)
 507                         return -1;
 508                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 509                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 510                 rules->trie_nodes = nodes;
 511                 rules->trie_nodes_max += add;
 512         }
 513
 514         /* get a new node */
 515         new_node_idx = rules->trie_nodes_cur;
 516         rules->trie_nodes_cur++;
 517         new_node = &rules->trie_nodes[new_node_idx];
 518         memset(new_node, 0x00, sizeof(struct trie_node));
 519         new_node->value_off = off;
 520         new_node->value_len = len;
 521         new_node->key = key;
 522
 523         /* join the parent's child list */
 524         parent = &rules->trie_nodes[node_idx];
 525         if (parent->child_idx == 0) {
 526                 parent->child_idx = new_node_idx;
 527         } else {
 528                 struct trie_node *last_child;
 529
 530                 last_child = &rules->trie_nodes[parent->last_child_idx];
 531                 last_child->next_child_idx = new_node_idx;
 532         }
 533         parent->last_child_idx = new_node_idx;
 534         return off;
 535 }
 536
 537 static int add_token(struct udev_rules *rules, struct token *token)
 538 {
 539         /* grow buffer if needed */
 540         if (rules->token_cur+1 >= rules->token_max) {
 541                 struct token *tokens;
 542                 unsigned int add;
 543
 544                 /* double the buffer size */
 545                 add = rules->token_max;
 546                 if (add < 8)
 547                         add = 8;
 548
 549                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 550                 if (tokens == NULL)
 551                         return -1;
 552                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 553                 rules->tokens = tokens;
 554                 rules->token_max += add;
 555         }
 556         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 557         rules->token_cur++;
 558         return 0;
 559 }
 560
 561 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 562 {
 563         unsigned int i;
 564         uid_t uid;
 565         unsigned int off;
 566
 567         /* lookup, if we know it already */
 568         for (i = 0; i < rules->uids_cur; i++) {
 569                 off = rules->uids[i].name_off;
 570                 if (strcmp(&rules->buf[off], owner) == 0) {
 571                         uid = rules->uids[i].uid;
 572                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 573                         return uid;
 574                 }
 575         }
 576         uid = util_lookup_user(rules->udev, owner);
 577
 578         /* grow buffer if needed */
 579         if (rules->uids_cur+1 >= rules->uids_max) {
 580                 struct uid_gid *uids;
 581                 unsigned int add;
 582
 583                 /* double the buffer size */
 584                 add = rules->uids_max;
 585                 if (add < 1)
 586                         add = 8;
 587
 588                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 589                 if (uids == NULL)
 590                         return uid;
 591                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 592                 rules->uids = uids;
 593                 rules->uids_max += add;
 594         }
 595         rules->uids[rules->uids_cur].uid = uid;
 596         off = add_string(rules, owner);
 597         if (off <= 0)
 598                 return uid;
 599         rules->uids[rules->uids_cur].name_off = off;
 600         rules->uids_cur++;
 601         return uid;
 602 }
 603
 604 static gid_t add_gid(struct udev_rules *rules, const char *group)
 605 {
 606         unsigned int i;
 607         gid_t gid;
 608         unsigned int off;
 609
 610         /* lookup, if we know it already */
 611         for (i = 0; i < rules->gids_cur; i++) {
 612                 off = rules->gids[i].name_off;
 613                 if (strcmp(&rules->buf[off], group) == 0) {
 614                         gid = rules->gids[i].gid;
 615                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 616                         return gid;
 617                 }
 618         }
 619         gid = util_lookup_group(rules->udev, group);
 620
 621         /* grow buffer if needed */
 622         if (rules->gids_cur+1 >= rules->gids_max) {
 623                 struct uid_gid *gids;
 624                 unsigned int add;
 625
 626                 /* double the buffer size */
 627                 add = rules->gids_max;
 628                 if (add < 1)
 629                         add = 8;
 630
 631                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 632                 if (gids == NULL)
 633                         return gid;
 634                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 635                 rules->gids = gids;
 636                 rules->gids_max += add;
 637         }
 638         rules->gids[rules->gids_cur].gid = gid;
 639         off = add_string(rules, group);
 640         if (off <= 0)
 641                 return gid;
 642         rules->gids[rules->gids_cur].name_off = off;
 643         rules->gids_cur++;
 644         return gid;
 645 }
 646
 647 static int import_property_from_string(struct udev_device *dev, char *line)
 648 {
 649         struct udev *udev = udev_device_get_udev(dev);
 650         char *key;
 651         char *val;
 652         size_t len;
 653
 654         /* find key */
 655         key = line;
 656         while (isspace(key[0]))
 657                 key++;
 658
 659         /* comment or empty line */
 660         if (key[0] == '#' || key[0] == '\0')
 661                 return -1;
 662
 663         /* split key/value */
 664         val = strchr(key, '=');
 665         if (val == NULL)
 666                 return -1;
 667         val[0] = '\0';
 668         val++;
 669
 670         /* find value */
 671         while (isspace(val[0]))
 672                 val++;
 673
 674         /* terminate key */
 675         len = strlen(key);
 676         if (len == 0)
 677                 return -1;
 678         while (isspace(key[len-1]))
 679                 len--;
 680         key[len] = '\0';
 681
 682         /* terminate value */
 683         len = strlen(val);
 684         if (len == 0)
 685                 return -1;
 686         while (isspace(val[len-1]))
 687                 len--;
 688         val[len] = '\0';
 689
 690         if (len == 0)
 691                 return -1;
 692
 693         /* unquote */
 694         if (val[0] == '"' || val[0] == '\'') {
 695                 if (val[len-1] != val[0]) {
 696                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 697                         return -1;
 698                 }
 699                 val[len-1] = '\0';
 700                 val++;
 701         }
 702
 703         dbg(udev, "adding '%s'='%s'\n", key, val);
 704
 705         /* handle device, renamed by external tool, returning new path */
 706         if (strcmp(key, "DEVPATH") == 0) {
 707                 char syspath[UTIL_PATH_SIZE];
 708
 709                 info(udev, "updating devpath from '%s' to '%s'\n",
 710                      udev_device_get_devpath(dev), val);
 711                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 712                 udev_device_set_syspath(dev, syspath);
 713         } else {
 714                 struct udev_list_entry *entry;
 715
 716                 entry = udev_device_add_property(dev, key, val);
 717                 /* store in db, skip private keys */
 718                 if (key[0] != '.')
 719                         udev_list_entry_set_flags(entry, 1);
 720         }
 721         return 0;
 722 }
 723
 724 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 725 {
 726         FILE *f;
 727         char line[UTIL_LINE_SIZE];
 728
 729         f = fopen(filename, "r");
 730         if (f == NULL)
 731                 return -1;
 732         while (fgets(line, sizeof(line), f) != NULL)
 733                 import_property_from_string(dev, line);
 734         fclose(f);
 735         return 0;
 736 }
 737
 738 static int import_program_into_properties(struct udev_device *dev, const char *program)
 739 {
 740         struct udev *udev = udev_device_get_udev(dev);
 741         char **envp;
 742         char result[4096];
 743         size_t reslen;
 744         char *line;
 745
 746         envp = udev_device_get_properties_envp(dev);
 747         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL) != 0)
 748                 return -1;
 749
 750         line = result;
 751         while (line != NULL) {
 752                 char *pos;
 753
 754                 pos = strchr(line, '\n');
 755                 if (pos != NULL) {
 756                         pos[0] = '\0';
 757                         pos = &pos[1];
 758                 }
 759                 import_property_from_string(dev, line);
 760                 line = pos;
 761         }
 762         return 0;
 763 }
 764
 765 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 766 {
 767         struct udev *udev = udev_device_get_udev(dev);
 768         struct udev_device *dev_parent;
 769         struct udev_list_entry *list_entry;
 770
 771         dev_parent = udev_device_get_parent(dev);
 772         if (dev_parent == NULL)
 773                 return -1;
 774
 775         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 776         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 777                 const char *key = udev_list_entry_get_name(list_entry);
 778                 const char *val = udev_list_entry_get_value(list_entry);
 779
 780                 if (fnmatch(filter, key, 0) == 0) {
 781                         struct udev_list_entry *entry;
 782
 783                         dbg(udev, "import key '%s=%s'\n", key, val);
 784                         entry = udev_device_add_property(dev, key, val);
 785                         /* store in db, skip private keys */
 786                         if (key[0] != '.')
 787                                 udev_list_entry_set_flags(entry, 1);
 788                 }
 789         }
 790         return 0;
 791 }
 792
 793 #define WAIT_LOOP_PER_SECOND            50
 794 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 795 {
 796         struct udev *udev = udev_device_get_udev(dev);
 797         char filepath[UTIL_PATH_SIZE];
 798         char devicepath[UTIL_PATH_SIZE];
 799         struct stat stats;
 800         int loop = timeout * WAIT_LOOP_PER_SECOND;
 801
 802         /* a relative path is a device attribute */
 803         devicepath[0] = '\0';
 804         if (file[0] != '/') {
 805                 util_strscpyl(devicepath, sizeof(devicepath),
 806                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 807                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 808                 file = filepath;
 809         }
 810
 811         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 812         while (--loop) {
 813                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 814
 815                 /* lookup file */
 816                 if (stat(file, &stats) == 0) {
 817                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 818                         return 0;
 819                 }
 820                 /* make sure, the device did not disappear in the meantime */
 821                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 822                         info(udev, "device disappeared while waiting for '%s'\n", file);
 823                         return -2;
 824                 }
 825                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 826                 nanosleep(&duration, NULL);
 827         }
 828         info(udev, "waiting for '%s' failed\n", file);
 829         return -1;
 830 }
 831
 832 static int attr_subst_subdir(char *attr, size_t len)
 833 {
 834         int found = 0;
 835
 836         if (strstr(attr, "/*/")) {
 837                 char *pos;
 838                 char dirname[UTIL_PATH_SIZE];
 839                 const char *tail;
 840                 DIR *dir;
 841
 842                 util_strscpy(dirname, sizeof(dirname), attr);
 843                 pos = strstr(dirname, "/*/");
 844                 if (pos == NULL)
 845                         return -1;
 846                 pos[0] = '\0';
 847                 tail = &pos[2];
 848                 dir = opendir(dirname);
 849                 if (dir != NULL) {
 850                         struct dirent *dent;
 851
 852                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 853                                 struct stat stats;
 854
 855                                 if (dent->d_name[0] == '.')
 856                                         continue;
 857                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 858                                 if (stat(attr, &stats) == 0) {
 859                                         found = 1;
 860                                         break;
 861                                 }
 862                         }
 863                         closedir(dir);
 864                 }
 865         }
 866
 867         return found;
 868 }
 869
 870 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 871 {
 872         char *linepos;
 873         char *temp;
 874
 875         linepos = *line;
 876         if (linepos == NULL || linepos[0] == '\0')
 877                 return -1;
 878
 879         /* skip whitespace */
 880         while (isspace(linepos[0]) || linepos[0] == ',')
 881                 linepos++;
 882
 883         /* get the key */
 884         if (linepos[0] == '\0')
 885                 return -1;
 886         *key = linepos;
 887
 888         while (1) {
 889                 linepos++;
 890                 if (linepos[0] == '\0')
 891                         return -1;
 892                 if (isspace(linepos[0]))
 893                         break;
 894                 if (linepos[0] == '=')
 895                         break;
 896                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 897                         if (linepos[1] == '=')
 898                                 break;
 899         }
 900
 901         /* remember end of key */
 902         temp = linepos;
 903
 904         /* skip whitespace after key */
 905         while (isspace(linepos[0]))
 906                 linepos++;
 907         if (linepos[0] == '\0')
 908                 return -1;
 909
 910         /* get operation type */
 911         if (linepos[0] == '=' && linepos[1] == '=') {
 912                 *op = OP_MATCH;
 913                 linepos += 2;
 914         } else if (linepos[0] == '!' && linepos[1] == '=') {
 915                 *op = OP_NOMATCH;
 916                 linepos += 2;
 917         } else if (linepos[0] == '+' && linepos[1] == '=') {
 918                 *op = OP_ADD;
 919                 linepos += 2;
 920         } else if (linepos[0] == '=') {
 921                 *op = OP_ASSIGN;
 922                 linepos++;
 923         } else if (linepos[0] == ':' && linepos[1] == '=') {
 924                 *op = OP_ASSIGN_FINAL;
 925                 linepos += 2;
 926         } else
 927                 return -1;
 928
 929         /* terminate key */
 930         temp[0] = '\0';
 931
 932         /* skip whitespace after operator */
 933         while (isspace(linepos[0]))
 934                 linepos++;
 935         if (linepos[0] == '\0')
 936                 return -1;
 937
 938         /* get the value */
 939         if (linepos[0] == '"')
 940                 linepos++;
 941         else
 942                 return -1;
 943         *value = linepos;
 944
 945         /* terminate */
 946         temp = strchr(linepos, '"');
 947         if (!temp)
 948                 return -1;
 949         temp[0] = '\0';
 950         temp++;
 951         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 952
 953         /* move line to next key */
 954         *line = temp;
 955         return 0;
 956 }
 957
 958 /* extract possible KEY{attr} */
 959 static char *get_key_attribute(struct udev *udev, char *str)
 960 {
 961         char *pos;
 962         char *attr;
 963
 964         attr = strchr(str, '{');
 965         if (attr != NULL) {
 966                 attr++;
 967                 pos = strchr(attr, '}');
 968                 if (pos == NULL) {
 969                         err(udev, "missing closing brace for format\n");
 970                         return NULL;
 971                 }
 972                 pos[0] = '\0';
 973                 dbg(udev, "attribute='%s'\n", attr);
 974                 return attr;
 975         }
 976         return NULL;
 977 }
 978
 979 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 980                         enum operation_type op,
 981                         const char *value, const void *data)
 982 {
 983         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 984         const char *attr = NULL;
 985
 986         memset(token, 0x00, sizeof(struct token));
 987
 988         switch (type) {
 989         case TK_M_ACTION:
 990         case TK_M_DEVPATH:
 991         case TK_M_KERNEL:
 992         case TK_M_SUBSYSTEM:
 993         case TK_M_DRIVER:
 994         case TK_M_WAITFOR:
 995         case TK_M_DEVLINK:
 996         case TK_M_NAME:
 997         case TK_M_KERNELS:
 998         case TK_M_SUBSYSTEMS:
 999         case TK_M_DRIVERS:
1000         case TK_M_PROGRAM:
1001         case TK_M_IMPORT_FILE:
1002         case TK_M_IMPORT_PROG:
1003         case TK_M_IMPORT_DB:
1004         case TK_M_IMPORT_PARENT:
1005         case TK_M_RESULT:
1006         case TK_A_OWNER:
1007         case TK_A_GROUP:
1008         case TK_A_MODE:
1009         case TK_A_NAME:
1010         case TK_A_GOTO:
1011                 token->key.value_off = add_string(rule_tmp->rules, value);
1012                 break;
1013         case TK_M_ENV:
1014         case TK_M_ATTR:
1015         case TK_M_ATTRS:
1016         case TK_A_ATTR:
1017         case TK_A_ENV:
1018                 attr = data;
1019                 token->key.value_off = add_string(rule_tmp->rules, value);
1020                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1021                 break;
1022         case TK_A_DEVLINK:
1023                 token->key.value_off = add_string(rule_tmp->rules, value);
1024                 token->key.devlink_unique = *(int *)data;
1025                 break;
1026         case TK_M_TEST:
1027                 token->key.value_off = add_string(rule_tmp->rules, value);
1028                 if (data != NULL)
1029                         token->key.mode = *(mode_t *)data;
1030                 break;
1031         case TK_A_STRING_ESCAPE_NONE:
1032         case TK_A_STRING_ESCAPE_REPLACE:
1033         case TK_A_IGNORE_REMOVE:
1034                 break;
1035         case TK_A_RUN:
1036                 token->key.value_off = add_string(rule_tmp->rules, value);
1037                 token->key.fail_on_error = *(int *)data;
1038                 break;
1039         case TK_A_INOTIFY_WATCH:
1040         case TK_A_NUM_FAKE_PART:
1041         case TK_A_DEVLINK_PRIO:
1042                 token->key.devlink_prio = *(int *)data;
1043                 break;
1044         case TK_A_OWNER_ID:
1045                 token->key.uid = *(uid_t *)data;
1046                 break;
1047         case TK_A_GROUP_ID:
1048                 token->key.gid = *(gid_t *)data;
1049                 break;
1050         case TK_A_MODE_ID:
1051                 token->key.mode = *(mode_t *)data;
1052                 break;
1053         case TK_A_EVENT_TIMEOUT:
1054                 token->key.event_timeout = *(int *)data;
1055                 break;
1056         case TK_RULE:
1057         case TK_M_PARENTS_MIN:
1058         case TK_M_PARENTS_MAX:
1059         case TK_M_MAX:
1060         case TK_END:
1061         case TK_UNSET:
1062                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1063                 return -1;
1064         }
1065
1066         if (value != NULL && type < TK_M_MAX) {
1067                 /* check if we need to split or call fnmatch() while matching rules */
1068                 enum string_glob_type glob;
1069                 int has_split;
1070                 int has_glob;
1071
1072                 has_split = (strchr(value, '|') != NULL);
1073                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1074                 if (has_split && has_glob) {
1075                         glob = GL_SPLIT_GLOB;
1076                 } else if (has_split) {
1077                         glob = GL_SPLIT;
1078                 } else if (has_glob) {
1079                         if (strcmp(value, "?*") == 0)
1080                                 glob = GL_SOMETHING;
1081                         else
1082                                 glob = GL_GLOB;
1083                 } else {
1084                         glob = GL_PLAIN;
1085                 }
1086                 token->key.glob = glob;
1087         }
1088
1089         if (value != NULL && type > TK_M_MAX) {
1090                 /* check if assigned value has substitution chars */
1091                 if (value[0] == '[')
1092                         token->key.subst = SB_SUBSYS;
1093                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1094                         token->key.subst = SB_FORMAT;
1095                 else
1096                         token->key.subst = SB_NONE;
1097         }
1098
1099         if (attr != NULL) {
1100                 /* check if property/attribut name has substitution chars */
1101                 if (attr[0] == '[')
1102                         token->key.attrsubst = SB_SUBSYS;
1103                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1104                         token->key.attrsubst = SB_FORMAT;
1105                 else
1106                         token->key.attrsubst = SB_NONE;
1107         }
1108
1109         token->key.type = type;
1110         token->key.op = op;
1111         rule_tmp->token_cur++;
1112         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1113                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1114                 return -1;
1115         }
1116         return 0;
1117 }
1118
1119 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1120 {
1121         unsigned int i;
1122         unsigned int start = 0;
1123         unsigned int end = rule_tmp->token_cur;
1124
1125         for (i = 0; i < rule_tmp->token_cur; i++) {
1126                 enum token_type next_val = TK_UNSET;
1127                 unsigned int next_idx = 0;
1128                 unsigned int j;
1129
1130                 /* find smallest value */
1131                 for (j = start; j < end; j++) {
1132                         if (rule_tmp->token[j].type == TK_UNSET)
1133                                 continue;
1134                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1135                                 next_val = rule_tmp->token[j].type;
1136                                 next_idx = j;
1137                         }
1138                 }
1139
1140                 /* add token and mark done */
1141                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1142                         return -1;
1143                 rule_tmp->token[next_idx].type = TK_UNSET;
1144
1145                 /* shrink range */
1146                 if (next_idx == start)
1147                         start++;
1148                 if (next_idx+1 == end)
1149                         end--;
1150         }
1151         return 0;
1152 }
1153
1154 static int add_rule(struct udev_rules *rules, char *line,
1155                     const char *filename, unsigned int filename_off, unsigned int lineno)
1156 {
1157         char *linepos;
1158         char *attr;
1159         struct rule_tmp rule_tmp;
1160         bool bus_warn = false;
1161         bool sysfs_warn = false;
1162         bool id_warn = false;
1163
1164         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1165         rule_tmp.rules = rules;
1166         rule_tmp.rule.type = TK_RULE;
1167         rule_tmp.rule.rule.filename_off = filename_off;
1168         rule_tmp.rule.rule.filename_line = lineno;
1169
1170         linepos = line;
1171         while (1) {
1172                 char *key;
1173                 char *value;
1174                 enum operation_type op;
1175
1176                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1177                         break;
1178
1179                 if (strcmp(key, "ACTION") == 0) {
1180                         if (op > OP_MATCH_MAX) {
1181                                 err(rules->udev, "invalid ACTION operation\n");
1182                                 goto invalid;
1183                         }
1184                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1185                         continue;
1186                 }
1187
1188                 if (strcmp(key, "DEVPATH") == 0) {
1189                         if (op > OP_MATCH_MAX) {
1190                                 err(rules->udev, "invalid DEVPATH operation\n");
1191                                 goto invalid;
1192                         }
1193                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1194                         continue;
1195                 }
1196
1197                 if (strcmp(key, "KERNEL") == 0) {
1198                         if (op > OP_MATCH_MAX) {
1199                                 err(rules->udev, "invalid KERNEL operation\n");
1200                                 goto invalid;
1201                         }
1202                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1203                         continue;
1204                 }
1205
1206                 if (strcmp(key, "SUBSYSTEM") == 0) {
1207                         if (op > OP_MATCH_MAX) {
1208                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1209                                 goto invalid;
1210                         }
1211                         /* bus, class, subsystem events should all be the same */
1212                         if (strcmp(value, "subsystem") == 0 ||
1213                             strcmp(value, "bus") == 0 ||
1214                             strcmp(value, "class") == 0) {
1215                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1216                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1217                                             "please fix it in %s:%u", value, filename, lineno);
1218                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1219                         } else
1220                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1221                         continue;
1222                 }
1223
1224                 if (strcmp(key, "DRIVER") == 0) {
1225                         if (op > OP_MATCH_MAX) {
1226                                 err(rules->udev, "invalid DRIVER operation\n");
1227                                 goto invalid;
1228                         }
1229                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1230                         continue;
1231                 }
1232
1233                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1234                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1235                         if (attr == NULL) {
1236                                 err(rules->udev, "error parsing ATTR attribute\n");
1237                                 goto invalid;
1238                         }
1239                         if (op < OP_MATCH_MAX) {
1240                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1241                         } else {
1242                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1243                         }
1244                         continue;
1245                 }
1246
1247                 if (strcmp(key, "KERNELS") == 0) {
1248                         if (op > OP_MATCH_MAX) {
1249                                 err(rules->udev, "invalid KERNELS operation\n");
1250                                 goto invalid;
1251                         }
1252                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1253                         continue;
1254                 }
1255
1256                 if (strcmp(key, "ID") == 0) {
1257                         if (!id_warn) {
1258                                 id_warn = true;
1259                                 err(rules->udev, "ID= will be removed in a future udev version, "
1260                                     "please use KERNEL= to match the event device, or KERNELS= "
1261                                     "to match a parent device, in %s:%u\n", filename, lineno);
1262                         }
1263                         if (op > OP_MATCH_MAX) {
1264                                 err(rules->udev, "invalid KERNELS operation\n");
1265                                 goto invalid;
1266                         }
1267                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1268                         continue;
1269                 }
1270
1271                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1272                         if (op > OP_MATCH_MAX) {
1273                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1274                                 goto invalid;
1275                         }
1276                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1277                         continue;
1278                 }
1279
1280                 if (strcmp(key, "BUS") == 0) {
1281                         if (!bus_warn) {
1282                                 bus_warn = true;
1283                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1284                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1285                                     "to match a parent device, in %s:%u\n", filename, lineno);
1286                         }
1287                         if (op > OP_MATCH_MAX) {
1288                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1289                                 goto invalid;
1290                         }
1291                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1292                         continue;
1293                 }
1294
1295                 if (strcmp(key, "DRIVERS") == 0) {
1296                         if (op > OP_MATCH_MAX) {
1297                                 err(rules->udev, "invalid DRIVERS operation\n");
1298                                 goto invalid;
1299                         }
1300                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1301                         continue;
1302                 }
1303
1304                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1305                         if (op > OP_MATCH_MAX) {
1306                                 err(rules->udev, "invalid ATTRS operation\n");
1307                                 goto invalid;
1308                         }
1309                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1310                         if (attr == NULL) {
1311                                 err(rules->udev, "error parsing ATTRS attribute\n");
1312                                 goto invalid;
1313                         }
1314                         if (strncmp(attr, "device/", 7) == 0)
1315                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1316                                     "please fix it in %s:%u", filename, lineno);
1317                         else if (strstr(attr, "../") != NULL)
1318                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1319                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1320                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1321                         continue;
1322                 }
1323
1324                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1325                         if (!sysfs_warn) {
1326                                 sysfs_warn = true;
1327                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1328                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1329                                     "to match a parent device, in %s:%u\n", filename, lineno);
1330                         }
1331                         if (op > OP_MATCH_MAX) {
1332                                 err(rules->udev, "invalid ATTRS operation\n");
1333                                 goto invalid;
1334                         }
1335                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1336                         if (attr == NULL) {
1337                                 err(rules->udev, "error parsing ATTRS attribute\n");
1338                                 goto invalid;
1339                         }
1340                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1341                         continue;
1342                 }
1343
1344                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1345                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1346                         if (attr == NULL) {
1347                                 err(rules->udev, "error parsing ENV attribute\n");
1348                                 goto invalid;
1349                         }
1350                         if (op < OP_MATCH_MAX) {
1351                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1352                                         goto invalid;
1353                         } else {
1354                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1355                                         goto invalid;
1356                         }
1357                         continue;
1358                 }
1359
1360                 if (strcmp(key, "PROGRAM") == 0) {
1361                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1362                         continue;
1363                 }
1364
1365                 if (strcmp(key, "RESULT") == 0) {
1366                         if (op > OP_MATCH_MAX) {
1367                                 err(rules->udev, "invalid RESULT operation\n");
1368                                 goto invalid;
1369                         }
1370                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1371                         continue;
1372                 }
1373
1374                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1375                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1376                         if (attr != NULL && strstr(attr, "program")) {
1377                                 dbg(rules->udev, "IMPORT will be executed\n");
1378                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1379                         } else if (attr != NULL && strstr(attr, "file")) {
1380                                 dbg(rules->udev, "IMPORT will be included as file\n");
1381                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1382                         } else if (attr != NULL && strstr(attr, "db")) {
1383                                 dbg(rules->udev, "IMPORT will include db values\n");
1384                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1385                         } else if (attr != NULL && strstr(attr, "parent")) {
1386                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1387                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1388                         } else {
1389                                 /* figure it out if it is executable */
1390                                 char file[UTIL_PATH_SIZE];
1391                                 char *pos;
1392                                 struct stat statbuf;
1393
1394                                 /* allow programs in /lib/udev called without the path */
1395                                 if (value[0] != '/')
1396                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1397                                 else
1398                                         util_strscpy(file, sizeof(file), value);
1399                                 pos = strchr(file, ' ');
1400                                 if (pos)
1401                                         pos[0] = '\0';
1402                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1403                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1404                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1405                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1406                                 } else {
1407                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1408                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1409                                 }
1410                         }
1411                         continue;
1412                 }
1413
1414                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1415                         mode_t mode = 0;
1416
1417                         if (op > OP_MATCH_MAX) {
1418                                 err(rules->udev, "invalid TEST operation\n");
1419                                 goto invalid;
1420                         }
1421                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1422                         if (attr != NULL) {
1423                                 mode = strtol(attr, NULL, 8);
1424                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1425                         } else {
1426                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1427                         }
1428                         continue;
1429                 }
1430
1431                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1432                         int flag = 0;
1433
1434                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1435                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1436                                 flag = 1;
1437                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1438                         continue;
1439                 }
1440
1441                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1442                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1443                         continue;
1444                 }
1445
1446                 if (strcmp(key, "LABEL") == 0) {
1447                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1448                         continue;
1449                 }
1450
1451                 if (strcmp(key, "GOTO") == 0) {
1452                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1453                         continue;
1454                 }
1455
1456                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1457                         if (op < OP_MATCH_MAX) {
1458                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1459                         } else {
1460                                 if (value[0] == '\0')
1461                                         info(rules->udev, "name empty, node creation suppressed\n");
1462                                 else if (strcmp(value, "%k") == 0)
1463                                         err(rules->udev, "NAME=\"%%k\" is superfluous and breaks "
1464                                             "kernel supplied names, please remove it from %s:%u\n", filename, lineno);
1465                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1466                         }
1467                         rule_tmp.rule.rule.flags = 1;
1468                         continue;
1469                 }
1470
1471                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1472                         if (op < OP_MATCH_MAX) {
1473                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1474                         } else {
1475                                 int flag = 0;
1476
1477                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1478                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1479                                         flag = 1;
1480                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1481                         }
1482                         rule_tmp.rule.rule.flags = 1;
1483                         continue;
1484                 }
1485
1486                 if (strcmp(key, "OWNER") == 0) {
1487                         uid_t uid;
1488                         char *endptr;
1489
1490                         uid = strtoul(value, &endptr, 10);
1491                         if (endptr[0] == '\0') {
1492                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1493                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1494                                 uid = add_uid(rules, value);
1495                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1496                         } else if (rules->resolve_names >= 0) {
1497                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1498                         }
1499                         rule_tmp.rule.rule.flags = 1;
1500                         continue;
1501                 }
1502
1503                 if (strcmp(key, "GROUP") == 0) {
1504                         gid_t gid;
1505                         char *endptr;
1506
1507                         gid = strtoul(value, &endptr, 10);
1508                         if (endptr[0] == '\0') {
1509                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1510                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1511                                 gid = add_gid(rules, value);
1512                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1513                         } else if (rules->resolve_names >= 0) {
1514                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1515                         }
1516                         rule_tmp.rule.rule.flags = 1;
1517                         continue;
1518                 }
1519
1520                 if (strcmp(key, "MODE") == 0) {
1521                         mode_t mode;
1522                         char *endptr;
1523
1524                         mode = strtol(value, &endptr, 8);
1525                         if (endptr[0] == '\0')
1526                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1527                         else
1528                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1529                         rule_tmp.rule.rule.flags = 1;
1530                         continue;
1531                 }
1532
1533                 if (strcmp(key, "OPTIONS") == 0) {
1534                         const char *pos;
1535
1536                         pos = strstr(value, "link_priority=");
1537                         if (pos != NULL) {
1538                                 int prio = atoi(&pos[strlen("link_priority=")]);
1539
1540                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1541                                 dbg(rules->udev, "link priority=%i\n", prio);
1542                         }
1543                         pos = strstr(value, "event_timeout=");
1544                         if (pos != NULL) {
1545                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1546
1547                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1548                                 dbg(rules->udev, "event timeout=%i\n", tout);
1549                         }
1550                         pos = strstr(value, "string_escape=");
1551                         if (pos != NULL) {
1552                                 pos = &pos[strlen("string_escape=")];
1553                                 if (strncmp(pos, "none", strlen("none")) == 0)
1554                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1555                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1556                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1557                         }
1558                         pos = strstr(value, "nowatch");
1559                         if (pos != NULL) {
1560                                 const int off = 0;
1561
1562                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &off);
1563                                 dbg(rules->udev, "inotify watch of device disabled\n");
1564                         } else {
1565                                 pos = strstr(value, "watch");
1566                                 if (pos != NULL) {
1567                                         const int on = 1;
1568
1569                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &on);
1570                                         dbg(rules->udev, "inotify watch of device requested\n");
1571                                 }
1572                         }
1573                         continue;
1574                 }
1575                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1576         }
1577
1578         /* add rule token */
1579         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1580         if (add_token(rules, &rule_tmp.rule) != 0)
1581                 goto invalid;
1582
1583         /* add tokens to list, sorted by type */
1584         if (sort_token(rules, &rule_tmp) != 0)
1585                 goto invalid;
1586
1587         return 0;
1588 invalid:
1589         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1590         return -1;
1591 }
1592
1593 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1594 {
1595         FILE *f;
1596         unsigned int first_token;
1597         char line[UTIL_LINE_SIZE];
1598         int line_nr = 0;
1599         unsigned int i;
1600
1601         info(rules->udev, "reading '%s' as rules file\n", filename);
1602
1603         f = fopen(filename, "r");
1604         if (f == NULL)
1605                 return -1;
1606
1607         first_token = rules->token_cur;
1608
1609         while (fgets(line, sizeof(line), f) != NULL) {
1610                 char *key;
1611                 size_t len;
1612
1613                 /* skip whitespace */
1614                 line_nr++;
1615                 key = line;
1616                 while (isspace(key[0]))
1617                         key++;
1618
1619                 /* comment */
1620                 if (key[0] == '#')
1621                         continue;
1622
1623                 len = strlen(line);
1624                 if (len < 3)
1625                         continue;
1626
1627                 /* continue reading if backslash+newline is found */
1628                 while (line[len-2] == '\\') {
1629                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1630                                 break;
1631                         if (strlen(&line[len-2]) < 2)
1632                                 break;
1633                         line_nr++;
1634                         len = strlen(line);
1635                 }
1636
1637                 if (len+1 >= sizeof(line)) {
1638                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1639                         continue;
1640                 }
1641                 add_rule(rules, key, filename, filename_off, line_nr);
1642         }
1643         fclose(f);
1644
1645         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1646         for (i = first_token+1; i < rules->token_cur; i++) {
1647                 if (rules->tokens[i].type == TK_A_GOTO) {
1648                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1649                         unsigned int j;
1650
1651                         for (j = i+1; j < rules->token_cur; j++) {
1652                                 if (rules->tokens[j].type != TK_RULE)
1653                                         continue;
1654                                 if (rules->tokens[j].rule.label_off == 0)
1655                                         continue;
1656                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1657                                         continue;
1658                                 rules->tokens[i].key.rule_goto = j;
1659                                 break;
1660                         }
1661                         if (rules->tokens[i].key.rule_goto == 0)
1662                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1663                 }
1664         }
1665         return 0;
1666 }
1667
1668 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1669 {
1670         DIR *dir;
1671         char filename[UTIL_PATH_SIZE];
1672
1673         dbg(udev, "open directory '%s'\n", dirname);
1674         dir = opendir(dirname);
1675         if (dir == NULL) {
1676                 info(udev, "unable to open '%s': %m\n", dirname);
1677                 return -1;
1678         }
1679
1680         while (1) {
1681                 struct dirent *dent;
1682
1683                 dent = readdir(dir);
1684                 if (dent == NULL || dent->d_name[0] == '\0')
1685                         break;
1686
1687                 if (dent->d_name[0] == '.')
1688                         continue;
1689
1690                 /* look for file matching with specified suffix */
1691                 if (suffix != NULL) {
1692                         const char *ext;
1693
1694                         ext = strrchr(dent->d_name, '.');
1695                         if (ext == NULL)
1696                                 continue;
1697                         if (strcmp(ext, suffix) != 0)
1698                                 continue;
1699                 }
1700                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1701                 dbg(udev, "put file '%s' into list\n", filename);
1702                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1703         }
1704
1705         closedir(dir);
1706         return 0;
1707 }
1708
1709 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1710 {
1711         struct udev_rules *rules;
1712         struct stat statbuf;
1713         struct udev_list_node file_list;
1714         struct udev_list_entry *file_loop, *file_tmp;
1715         struct token end_token;
1716
1717         rules = malloc(sizeof(struct udev_rules));
1718         if (rules == NULL)
1719                 return NULL;
1720         memset(rules, 0x00, sizeof(struct udev_rules));
1721         rules->udev = udev;
1722         rules->resolve_names = resolve_names;
1723         udev_list_init(&file_list);
1724
1725         /* init token array and string buffer */
1726         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1727         if (rules->tokens == NULL)
1728                 return NULL;
1729         rules->token_max = PREALLOC_TOKEN;
1730
1731         rules->buf = malloc(PREALLOC_STRBUF);
1732         if (rules->buf == NULL)
1733                 return NULL;
1734         rules->buf_max = PREALLOC_STRBUF;
1735         /* offset 0 is always '\0' */
1736         rules->buf[0] = '\0';
1737         rules->buf_cur = 1;
1738         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1739             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1740
1741         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1742         if (rules->trie_nodes == NULL)
1743                 return NULL;
1744         rules->trie_nodes_max = PREALLOC_TRIE;
1745         /* offset 0 is the trie root, with an empty string */
1746         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1747         rules->trie_nodes_cur = 1;
1748
1749         if (udev_get_rules_path(udev) != NULL) {
1750                 /* custom rules location for testing */
1751                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1752         } else {
1753                 char filename[PATH_MAX];
1754                 struct udev_list_node sort_list;
1755                 struct udev_list_entry *sort_loop, *sort_tmp;
1756
1757                 /* read user/custom rules */
1758                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1759
1760                 /* read dynamic/temporary rules */
1761                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1762                 udev_list_init(&sort_list);
1763                 add_matching_files(udev, &sort_list, filename, ".rules");
1764
1765                 /* read default rules */
1766                 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1767
1768                 /* sort all rules files by basename into list of files */
1769                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1770                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1771                         const char *sort_base = strrchr(sort_name, '/');
1772
1773                         if (sort_base == NULL)
1774                                 continue;
1775                         /* sort entry into existing list */
1776                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1777                                 const char *file_name = udev_list_entry_get_name(file_loop);
1778                                 const char *file_base = strrchr(file_name, '/');
1779
1780                                 if (file_base == NULL)
1781                                         continue;
1782                                 if (strcmp(file_base, sort_base) == 0) {
1783                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1784                                              file_name, sort_name);
1785                                         udev_list_entry_delete(sort_loop);
1786                                         sort_loop = NULL;
1787                                         break;
1788                                 }
1789                                 if (strcmp(file_base, sort_base) > 0) {
1790                                         /* found later file, insert before */
1791                                         udev_list_entry_remove(sort_loop);
1792                                         udev_list_entry_insert_before(sort_loop, file_loop);
1793                                         sort_loop = NULL;
1794                                         break;
1795                                 }
1796                         }
1797                         /* current file already handled */
1798                         if (sort_loop == NULL)
1799                                 continue;
1800                         /* no later file, append to end of list */
1801                         udev_list_entry_remove(sort_loop);
1802                         udev_list_entry_append(sort_loop, &file_list);
1803                 }
1804         }
1805
1806         /* add all filenames to the string buffer */
1807         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1808                 const char *filename = udev_list_entry_get_name(file_loop);
1809                 unsigned int filename_off;
1810
1811                 filename_off = add_string(rules, filename);
1812                 /* the offset in the rule is limited to unsigned short */
1813                 if (filename_off < USHRT_MAX)
1814                         udev_list_entry_set_flags(file_loop, filename_off);
1815         }
1816
1817         /* parse list of files */
1818         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1819                 const char *filename = udev_list_entry_get_name(file_loop);
1820                 unsigned int filename_off = udev_list_entry_get_flags(file_loop);
1821
1822                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1823                         parse_file(rules, filename, filename_off);
1824                 else
1825                         err(udev, "can not read '%s'\n", filename);
1826                 udev_list_entry_delete(file_loop);
1827         }
1828
1829         memset(&end_token, 0x00, sizeof(struct token));
1830         end_token.type = TK_END;
1831         add_token(rules, &end_token);
1832
1833         /* shrink allocated token and string buffer */
1834         if (rules->token_cur < rules->token_max) {
1835                 struct token *tokens;
1836
1837                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1838                 if (tokens != NULL || rules->token_cur == 0) {
1839                         rules->tokens = tokens;
1840                         rules->token_max = rules->token_cur;
1841                 }
1842         }
1843         if (rules->buf_cur < rules->buf_max) {
1844                 char *buf;
1845
1846                 buf = realloc(rules->buf, rules->buf_cur);
1847                 if (buf != NULL || rules->buf_cur == 0) {
1848                         rules->buf = buf;
1849                         rules->buf_max = rules->buf_cur;
1850                 }
1851         }
1852         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1853              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1854         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1855              rules->trie_nodes_cur * sizeof(struct trie_node),
1856              rules->trie_nodes_cur, sizeof(struct trie_node));
1857
1858         /* cleanup trie */
1859         free(rules->trie_nodes);
1860         rules->trie_nodes = NULL;
1861         rules->trie_nodes_cur = 0;
1862         rules->trie_nodes_max = 0;
1863
1864         /* cleanup uid/gid cache */
1865         free(rules->uids);
1866         rules->uids = NULL;
1867         rules->uids_cur = 0;
1868         rules->uids_max = 0;
1869         free(rules->gids);
1870         rules->gids = NULL;
1871         rules->gids_cur = 0;
1872         rules->gids_max = 0;
1873
1874         dump_rules(rules);
1875         return rules;
1876 }
1877
1878 void udev_rules_unref(struct udev_rules *rules)
1879 {
1880         if (rules == NULL)
1881                 return;
1882         free(rules->tokens);
1883         free(rules->buf);
1884         free(rules->trie_nodes);
1885         free(rules->uids);
1886         free(rules->gids);
1887         free(rules);
1888 }
1889
1890 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1891 {
1892         char *key_value = &rules->buf[token->key.value_off];
1893         char *pos;
1894         int match = 0;
1895
1896         if (val == NULL)
1897                 val = "";
1898
1899         switch (token->key.glob) {
1900         case GL_PLAIN:
1901                 match = (strcmp(key_value, val) == 0);
1902                 break;
1903         case GL_GLOB:
1904                 match = (fnmatch(key_value, val, 0) == 0);
1905                 break;
1906         case GL_SPLIT:
1907                 {
1908                         const char *split;
1909                         size_t len;
1910
1911                         split = &rules->buf[token->key.value_off];
1912                         len = strlen(val);
1913                         while (1) {
1914                                 const char *next;
1915
1916                                 next = strchr(split, '|');
1917                                 if (next != NULL) {
1918                                         size_t matchlen = (size_t)(next - split);
1919
1920                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1921                                         if (match)
1922                                                 break;
1923                                 } else {
1924                                         match = (strcmp(split, val) == 0);
1925                                         break;
1926                                 }
1927                                 split = &next[1];
1928                         }
1929                         break;
1930                 }
1931         case GL_SPLIT_GLOB:
1932                 {
1933                         char value[UTIL_PATH_SIZE];
1934
1935                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1936                         key_value = value;
1937                         while (key_value != NULL) {
1938                                 pos = strchr(key_value, '|');
1939                                 if (pos != NULL) {
1940                                         pos[0] = '\0';
1941                                         pos = &pos[1];
1942                                 }
1943                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1944                                 match = (fnmatch(key_value, val, 0) == 0);
1945                                 if (match)
1946                                         break;
1947                                 key_value = pos;
1948                         }
1949                         break;
1950                 }
1951         case GL_SOMETHING:
1952                 match = (val[0] != '\0');
1953                 break;
1954         case GL_UNSET:
1955                 return -1;
1956         }
1957
1958         if (match && (token->key.op == OP_MATCH)) {
1959                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1960                 return 0;
1961         }
1962         if (!match && (token->key.op == OP_NOMATCH)) {
1963                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1964                 return 0;
1965         }
1966         dbg(rules->udev, "%s is not true\n", token_str(token->type));
1967         return -1;
1968 }
1969
1970 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1971 {
1972         const char *name;
1973         char nbuf[UTIL_NAME_SIZE];
1974         const char *value;
1975         char vbuf[UTIL_NAME_SIZE];
1976         size_t len;
1977
1978         name = &rules->buf[cur->key.attr_off];
1979         switch (cur->key.attrsubst) {
1980         case SB_FORMAT:
1981                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1982                 name = nbuf;
1983                 /* fall through */
1984         case SB_NONE:
1985                 value = udev_device_get_sysattr_value(dev, name);
1986                 if (value == NULL)
1987                         return -1;
1988                 break;
1989         case SB_SUBSYS:
1990                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1991                         return -1;
1992                 value = vbuf;
1993                 break;
1994         default:
1995                 return -1;
1996         }
1997
1998         /* remove trailing whitespace, if not asked to match for it */
1999         len = strlen(value);
2000         if (len > 0 && isspace(value[len-1])) {
2001                 const char *key_value;
2002                 size_t klen;
2003
2004                 key_value = &rules->buf[cur->key.value_off];
2005                 klen = strlen(key_value);
2006                 if (klen > 0 && !isspace(key_value[klen-1])) {
2007                         if (value != vbuf) {
2008                                 util_strscpy(vbuf, sizeof(vbuf), value);
2009                                 value = vbuf;
2010                         }
2011                         while (len > 0 && isspace(vbuf[--len]))
2012                                 vbuf[len] = '\0';
2013                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2014                 }
2015         }
2016
2017         return match_key(rules, cur, value);
2018 }
2019
2020 enum escape_type {
2021         ESCAPE_UNSET,
2022         ESCAPE_NONE,
2023         ESCAPE_REPLACE,
2024 };
2025
2026 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2027 {
2028         struct token *cur;
2029         struct token *rule;
2030         enum escape_type esc = ESCAPE_UNSET;
2031         bool can_set_name;
2032
2033         if (rules->tokens == NULL)
2034                 return -1;
2035
2036         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2037                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2038                          strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
2039
2040         /* loop through token list, match, run actions or forward to next rule */
2041         cur = &rules->tokens[0];
2042         rule = cur;
2043         while (1) {
2044                 dump_token(rules, cur);
2045                 switch (cur->type) {
2046                 case TK_RULE:
2047                         /* current rule */
2048                         rule = cur;
2049                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2050                         if (!can_set_name && rule->rule.flags)
2051                                 goto nomatch;
2052                         esc = ESCAPE_UNSET;
2053                         break;
2054                 case TK_M_ACTION:
2055                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2056                                 goto nomatch;
2057                         break;
2058                 case TK_M_DEVPATH:
2059                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2060                                 goto nomatch;
2061                         break;
2062                 case TK_M_KERNEL:
2063                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2064                                 goto nomatch;
2065                         break;
2066                 case TK_M_DEVLINK:
2067                         {
2068                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2069                                 struct udev_list_entry *list_entry;
2070                                 int match = 0;
2071
2072                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2073                                         const char *devlink;
2074
2075                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2076                                         if (match_key(rules, cur, devlink) == 0) {
2077                                                 match = 1;
2078                                                 break;
2079                                         }
2080                                 }
2081                                 if (!match)
2082                                         goto nomatch;
2083                                 break;
2084                         }
2085                 case TK_M_NAME:
2086                         if (match_key(rules, cur, event->name) != 0)
2087                                 goto nomatch;
2088                         break;
2089                 case TK_M_ENV:
2090                         {
2091                                 const char *key_name = &rules->buf[cur->key.attr_off];
2092                                 const char *value;
2093
2094                                 value = udev_device_get_property_value(event->dev, key_name);
2095                                 if (value == NULL) {
2096                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2097                                         value = "";
2098                                 }
2099                                 if (match_key(rules, cur, value))
2100                                         goto nomatch;
2101                                 break;
2102                         }
2103                 case TK_M_SUBSYSTEM:
2104                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2105                                 goto nomatch;
2106                         break;
2107                 case TK_M_DRIVER:
2108                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2109                                 goto nomatch;
2110                         break;
2111                 case TK_M_WAITFOR:
2112                         {
2113                                 char filename[UTIL_PATH_SIZE];
2114                                 int found;
2115
2116                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2117                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2118                                 if (!found && (cur->key.op != OP_NOMATCH))
2119                                         goto nomatch;
2120                                 break;
2121                         }
2122                 case TK_M_ATTR:
2123                         if (match_attr(rules, event->dev, event, cur) != 0)
2124                                 goto nomatch;
2125                         break;
2126                 case TK_M_KERNELS:
2127                 case TK_M_SUBSYSTEMS:
2128                 case TK_M_DRIVERS:
2129                 case TK_M_ATTRS:
2130                         {
2131                                 struct token *next;
2132
2133                                 /* get whole sequence of parent matches */
2134                                 next = cur;
2135                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2136                                         next++;
2137
2138                                 /* loop over parents */
2139                                 event->dev_parent = event->dev;
2140                                 while (1) {
2141                                         struct token *key;
2142
2143                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2144                                         /* loop over sequence of parent match keys */
2145                                         for (key = cur; key < next; key++ ) {
2146                                                 dump_token(rules, key);
2147                                                 switch(key->type) {
2148                                                 case TK_M_KERNELS:
2149                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2150                                                                 goto try_parent;
2151                                                         break;
2152                                                 case TK_M_SUBSYSTEMS:
2153                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2154                                                                 goto try_parent;
2155                                                         break;
2156                                                 case TK_M_DRIVERS:
2157                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2158                                                                 goto try_parent;
2159                                                         break;
2160                                                 case TK_M_ATTRS:
2161                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2162                                                                 goto try_parent;
2163                                                         break;
2164                                                 default:
2165                                                         goto nomatch;
2166                                                 }
2167                                                 dbg(event->udev, "parent key matched\n");
2168                                         }
2169                                         dbg(event->udev, "all parent keys matched\n");
2170                                         /* all keys matched */
2171                                         break;
2172
2173                                 try_parent:
2174                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2175                                         if (event->dev_parent == NULL)
2176                                                 goto nomatch;
2177                                 }
2178                                 /* move behind our sequence of parent match keys */
2179                                 cur = next;
2180                                 continue;
2181                         }
2182                 case TK_M_TEST:
2183                         {
2184                                 char filename[UTIL_PATH_SIZE];
2185                                 struct stat statbuf;
2186                                 int match;
2187
2188                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2189                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2190                                         if (filename[0] != '/') {
2191                                                 char tmp[UTIL_PATH_SIZE];
2192
2193                                                 util_strscpy(tmp, sizeof(tmp), filename);
2194                                                 util_strscpyl(filename, sizeof(filename),
2195                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2196                                         }
2197                                 }
2198                                 attr_subst_subdir(filename, sizeof(filename));
2199
2200                                 match = (stat(filename, &statbuf) == 0);
2201                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2202                                 if (match && cur->key.mode > 0) {
2203                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2204                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2205                                             match ? "matches" : "does not match", cur->key.mode);
2206                                 }
2207                                 if (match && cur->key.op == OP_NOMATCH)
2208                                         goto nomatch;
2209                                 if (!match && cur->key.op == OP_MATCH)
2210                                         goto nomatch;
2211                                 break;
2212                         }
2213                 case TK_M_PROGRAM:
2214                         {
2215                                 char program[UTIL_PATH_SIZE];
2216                                 char **envp;
2217                                 char result[UTIL_PATH_SIZE];
2218
2219                                 free(event->program_result);
2220                                 event->program_result = NULL;
2221                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2222                                 envp = udev_device_get_properties_envp(event->dev);
2223                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2224                                      program,
2225                                      &rules->buf[rule->rule.filename_off],
2226                                      rule->rule.filename_line);
2227                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL) != 0) {
2228                                         if (cur->key.op != OP_NOMATCH)
2229                                                 goto nomatch;
2230                                 } else {
2231                                         int count;
2232
2233                                         util_remove_trailing_chars(result, '\n');
2234                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2235                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2236                                                 if (count > 0)
2237                                                         info(event->udev, "%i character(s) replaced\n" , count);
2238                                         }
2239                                         event->program_result = strdup(result);
2240                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2241                                         if (cur->key.op == OP_NOMATCH)
2242                                                 goto nomatch;
2243                                 }
2244                                 break;
2245                         }
2246                 case TK_M_IMPORT_FILE:
2247                         {
2248                                 char import[UTIL_PATH_SIZE];
2249
2250                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2251                                 if (import_file_into_properties(event->dev, import) != 0)
2252                                         if (cur->key.op != OP_NOMATCH)
2253                                                 goto nomatch;
2254                                 break;
2255                         }
2256                 case TK_M_IMPORT_PROG:
2257                         {
2258                                 char import[UTIL_PATH_SIZE];
2259
2260                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2261                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2262                                      import,
2263                                      &rules->buf[rule->rule.filename_off],
2264                                      rule->rule.filename_line);
2265                                 if (import_program_into_properties(event->dev, import) != 0)
2266                                         if (cur->key.op != OP_NOMATCH)
2267                                                 goto nomatch;
2268                                 break;
2269                         }
2270                 case TK_M_IMPORT_DB:
2271                         {
2272                                 const char *key = &rules->buf[cur->key.value_off];
2273                                 const char *value;
2274
2275                                 value = udev_device_get_property_value(event->dev_db, key);
2276                                 if (value != NULL) {
2277                                         struct udev_list_entry *entry;
2278
2279                                         entry = udev_device_add_property(event->dev, key, value);
2280                                         udev_list_entry_set_flags(entry, 1);
2281                                 } else {
2282                                         if (cur->key.op != OP_NOMATCH)
2283                                                 goto nomatch;
2284                                 }
2285                                 break;
2286                         }
2287                 case TK_M_IMPORT_PARENT:
2288                         {
2289                                 char import[UTIL_PATH_SIZE];
2290
2291                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2292                                 if (import_parent_into_properties(event->dev, import) != 0)
2293                                         if (cur->key.op != OP_NOMATCH)
2294                                                 goto nomatch;
2295                                 break;
2296                         }
2297                 case TK_M_RESULT:
2298                         if (match_key(rules, cur, event->program_result) != 0)
2299                                 goto nomatch;
2300                         break;
2301                 case TK_A_STRING_ESCAPE_NONE:
2302                         esc = ESCAPE_NONE;
2303                         break;
2304                 case TK_A_STRING_ESCAPE_REPLACE:
2305                         esc = ESCAPE_REPLACE;
2306                         break;
2307                 case TK_A_INOTIFY_WATCH:
2308                         event->inotify_watch = cur->key.watch;
2309                         break;
2310                 case TK_A_DEVLINK_PRIO:
2311                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2312                         break;
2313                 case TK_A_OWNER:
2314                         {
2315                                 char owner[UTIL_NAME_SIZE];
2316
2317                                 if (event->owner_final)
2318                                         break;
2319                                 if (cur->key.op == OP_ASSIGN_FINAL)
2320                                         event->owner_final = 1;
2321                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2322                                 event->uid = util_lookup_user(event->udev, owner);
2323                                 info(event->udev, "OWNER %u %s:%u\n",
2324                                      event->uid,
2325                                      &rules->buf[rule->rule.filename_off],
2326                                      rule->rule.filename_line);
2327                                 break;
2328                         }
2329                 case TK_A_GROUP:
2330                         {
2331                                 char group[UTIL_NAME_SIZE];
2332
2333                                 if (event->group_final)
2334                                         break;
2335                                 if (cur->key.op == OP_ASSIGN_FINAL)
2336                                         event->group_final = 1;
2337                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2338                                 event->gid = util_lookup_group(event->udev, group);
2339                                 info(event->udev, "GROUP %u %s:%u\n",
2340                                      event->gid,
2341                                      &rules->buf[rule->rule.filename_off],
2342                                      rule->rule.filename_line);
2343                                 break;
2344                         }
2345                 case TK_A_MODE:
2346                         {
2347                                 char mode[UTIL_NAME_SIZE];
2348                                 char *endptr;
2349
2350                                 if (event->mode_final)
2351                                         break;
2352                                 if (cur->key.op == OP_ASSIGN_FINAL)
2353                                         event->mode_final = 1;
2354                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2355                                 event->mode = strtol(mode, &endptr, 8);
2356                                 if (endptr[0] != '\0') {
2357                                         err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2358                                         event->mode = 0660;
2359                                 }
2360                                 info(event->udev, "MODE %#o %s:%u\n",
2361                                      event->mode,
2362                                      &rules->buf[rule->rule.filename_off],
2363                                      rule->rule.filename_line);
2364                                 break;
2365                         }
2366                 case TK_A_OWNER_ID:
2367                         if (event->owner_final)
2368                                 break;
2369                         if (cur->key.op == OP_ASSIGN_FINAL)
2370                                 event->owner_final = 1;
2371                         event->uid = cur->key.uid;
2372                         info(event->udev, "OWNER %u %s:%u\n",
2373                              event->uid,
2374                              &rules->buf[rule->rule.filename_off],
2375                              rule->rule.filename_line);
2376                         break;
2377                 case TK_A_GROUP_ID:
2378                         if (event->group_final)
2379                                 break;
2380                         if (cur->key.op == OP_ASSIGN_FINAL)
2381                                 event->group_final = 1;
2382                         event->gid = cur->key.gid;
2383                         info(event->udev, "GROUP %u %s:%u\n",
2384                              event->gid,
2385                              &rules->buf[rule->rule.filename_off],
2386                              rule->rule.filename_line);
2387                         break;
2388                 case TK_A_MODE_ID:
2389                         if (event->mode_final)
2390                                 break;
2391                         if (cur->key.op == OP_ASSIGN_FINAL)
2392                                 event->mode_final = 1;
2393                         event->mode = cur->key.mode;
2394                         info(event->udev, "MODE %#o %s:%u\n",
2395                              event->mode,
2396                              &rules->buf[rule->rule.filename_off],
2397                              rule->rule.filename_line);
2398                         break;
2399                 case TK_A_ENV:
2400                         {
2401                                 const char *name = &rules->buf[cur->key.attr_off];
2402                                 char *value = &rules->buf[cur->key.value_off];
2403
2404                                 if (value[0] != '\0') {
2405                                         char temp_value[UTIL_NAME_SIZE];
2406                                         struct udev_list_entry *entry;
2407
2408                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2409                                         entry = udev_device_add_property(event->dev, name, temp_value);
2410                                         /* store in db, skip private keys */
2411                                         if (name[0] != '.')
2412                                                 udev_list_entry_set_flags(entry, 1);
2413                                 } else {
2414                                         udev_device_add_property(event->dev, name, NULL);
2415                                 }
2416                                 break;
2417                         }
2418                 case TK_A_NAME:
2419                         {
2420                                 const char *name  = &rules->buf[cur->key.value_off];
2421                                 char name_str[UTIL_PATH_SIZE];
2422                                 int count;
2423
2424                                 if (event->name_final)
2425                                         break;
2426                                 if (cur->key.op == OP_ASSIGN_FINAL)
2427                                         event->name_final = 1;
2428                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2429                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2430                                         count = udev_util_replace_chars(name_str, "/");
2431                                         if (count > 0)
2432                                                 info(event->udev, "%i character(s) replaced\n", count);
2433                                 }
2434                                 free(event->name);
2435                                 event->name = strdup(name_str);
2436                                 info(event->udev, "NAME '%s' %s:%u\n",
2437                                      event->name,
2438                                      &rules->buf[rule->rule.filename_off],
2439                                      rule->rule.filename_line);
2440                                 break;
2441                         }
2442                 case TK_A_DEVLINK:
2443                         {
2444                                 char temp[UTIL_PATH_SIZE];
2445                                 char filename[UTIL_PATH_SIZE];
2446                                 char *pos, *next;
2447                                 int count = 0;
2448
2449                                 if (event->devlink_final)
2450                                         break;
2451                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2452                                         break;
2453                                 if (cur->key.op == OP_ASSIGN_FINAL)
2454                                         event->devlink_final = 1;
2455                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2456                                         udev_device_cleanup_devlinks_list(event->dev);
2457
2458                                 /* allow  multiple symlinks separated by spaces */
2459                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2460                                 if (esc == ESCAPE_UNSET)
2461                                         count = udev_util_replace_chars(temp, "/ ");
2462                                 else if (esc == ESCAPE_REPLACE)
2463                                         count = udev_util_replace_chars(temp, "/");
2464                                 if (count > 0)
2465                                         info(event->udev, "%i character(s) replaced\n" , count);
2466                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2467                                 pos = temp;
2468                                 while (isspace(pos[0]))
2469                                         pos++;
2470                                 next = strchr(pos, ' ');
2471                                 while (next != NULL) {
2472                                         next[0] = '\0';
2473                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2474                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2475                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2476                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2477                                         while (isspace(next[1]))
2478                                                 next++;
2479                                         pos = &next[1];
2480                                         next = strchr(pos, ' ');
2481                                 }
2482                                 if (pos[0] != '\0') {
2483                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2484                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2485                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2486                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2487                                 }
2488                         }
2489                         break;
2490                 case TK_A_EVENT_TIMEOUT:
2491                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2492                         break;
2493                 case TK_A_ATTR:
2494                         {
2495                                 const char *key_name = &rules->buf[cur->key.attr_off];
2496                                 char attr[UTIL_PATH_SIZE];
2497                                 char value[UTIL_NAME_SIZE];
2498                                 FILE *f;
2499
2500                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2501                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2502                                 attr_subst_subdir(attr, sizeof(attr));
2503
2504                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2505                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2506                                      &rules->buf[rule->rule.filename_off],
2507                                      rule->rule.filename_line);
2508                                 f = fopen(attr, "w");
2509                                 if (f != NULL) {
2510                                         if (fprintf(f, "%s", value) <= 0)
2511                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2512                                         fclose(f);
2513                                 } else {
2514                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2515                                 }
2516                                 break;
2517                         }
2518                 case TK_A_RUN:
2519                         {
2520                                 struct udev_list_entry *list_entry;
2521
2522                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2523                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2524                                 info(event->udev, "RUN '%s' %s:%u\n",
2525                                      &rules->buf[cur->key.value_off],
2526                                      &rules->buf[rule->rule.filename_off],
2527                                      rule->rule.filename_line);
2528                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2529                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2530                                 if (cur->key.fail_on_error)
2531                                         udev_list_entry_set_flags(list_entry, 1);
2532                                 break;
2533                         }
2534                 case TK_A_GOTO:
2535                         if (cur->key.rule_goto == 0)
2536                                 break;
2537                         cur = &rules->tokens[cur->key.rule_goto];
2538                         continue;
2539                 case TK_END:
2540                         return 0;
2541
2542                 case TK_M_PARENTS_MIN:
2543                 case TK_M_PARENTS_MAX:
2544                 case TK_M_MAX:
2545                 case TK_UNSET:
2546                         err(rules->udev, "wrong type %u\n", cur->type);
2547                         goto nomatch;
2548                 }
2549
2550                 cur++;
2551                 continue;
2552         nomatch:
2553                 /* fast-forward to next rule */
2554                 cur = rule + rule->rule.token_count;
2555                 dbg(rules->udev, "forward to rule: %u\n",
2556                                  (unsigned int) (cur - rules->tokens));
2557         }
2558 }