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_TAG,                       /* val */
 129         TK_M_SUBSYSTEM,                 /* val */
 130         TK_M_DRIVER,                    /* val */
 131         TK_M_WAITFOR,                   /* val */
 132         TK_M_ATTR,                      /* val, attr */
 133
 134         TK_M_PARENTS_MIN,
 135         TK_M_KERNELS,                   /* val */
 136         TK_M_SUBSYSTEMS,                /* val */
 137         TK_M_DRIVERS,                   /* val */
 138         TK_M_ATTRS,                     /* val, attr */
 139         TK_M_PARENTS_MAX,
 140
 141         TK_M_TEST,                      /* val, mode_t */
 142         TK_M_PROGRAM,                   /* val */
 143         TK_M_IMPORT_FILE,               /* val */
 144         TK_M_IMPORT_PROG,               /* val */
 145         TK_M_IMPORT_DB,                 /* val */
 146         TK_M_IMPORT_PARENT,             /* val */
 147         TK_M_RESULT,                    /* val */
 148         TK_M_MAX,
 149
 150         TK_A_STRING_ESCAPE_NONE,
 151         TK_A_STRING_ESCAPE_REPLACE,
 152         TK_A_INOTIFY_WATCH,             /* 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_STATIC_NODE,               /* val */
 161         TK_A_ENV,                       /* val, attr */
 162         TK_A_TAG,                       /* val */
 163         TK_A_NAME,                      /* val */
 164         TK_A_DEVLINK,                   /* val */
 165         TK_A_EVENT_TIMEOUT,             /* int */
 166         TK_A_ATTR,                      /* val, attr */
 167         TK_A_RUN,                       /* val, bool */
 168         TK_A_GOTO,                      /* size_t */
 169
 170         TK_END,
 171 };
 172
 173 /* we try to pack stuff in a way that we take only 12 bytes per token */
 174 struct token {
 175         union {
 176                 unsigned char type;             /* same in rule and key */
 177                 struct {
 178                         enum token_type type:8;
 179                         bool can_set_name:1;
 180                         bool has_static_node:1;
 181                         unsigned int unused:6;
 182                         unsigned short token_count;
 183                         unsigned int label_off;
 184                         unsigned short filename_off;
 185                         unsigned short filename_line;
 186                 } rule;
 187                 struct {
 188                         enum token_type type:8;
 189                         enum operation_type op:8;
 190                         enum string_glob_type glob:8;
 191                         enum string_subst_type subst:4;
 192                         enum string_subst_type attrsubst:4;
 193                         unsigned int value_off;
 194                         union {
 195                                 unsigned int attr_off;
 196                                 int devlink_unique;
 197                                 int fail_on_error;
 198                                 unsigned int rule_goto;
 199                                 mode_t  mode;
 200                                 uid_t uid;
 201                                 gid_t gid;
 202                                 int devlink_prio;
 203                                 int event_timeout;
 204                                 int watch;
 205                         };
 206                 } key;
 207         };
 208 };
 209
 210 #define MAX_TK          64
 211 struct rule_tmp {
 212         struct udev_rules *rules;
 213         struct token rule;
 214         struct token token[MAX_TK];
 215         unsigned int token_cur;
 216 };
 217
 218 #ifdef ENABLE_DEBUG
 219 static const char *operation_str(enum operation_type type)
 220 {
 221         static const char *operation_strs[] = {
 222                 [OP_UNSET] =            "UNSET",
 223                 [OP_MATCH] =            "match",
 224                 [OP_NOMATCH] =          "nomatch",
 225                 [OP_MATCH_MAX] =        "MATCH_MAX",
 226
 227                 [OP_ADD] =              "add",
 228                 [OP_ASSIGN] =           "assign",
 229                 [OP_ASSIGN_FINAL] =     "assign-final",
 230 }       ;
 231
 232         return operation_strs[type];
 233 }
 234
 235 static const char *string_glob_str(enum string_glob_type type)
 236 {
 237         static const char *string_glob_strs[] = {
 238                 [GL_UNSET] =            "UNSET",
 239                 [GL_PLAIN] =            "plain",
 240                 [GL_GLOB] =             "glob",
 241                 [GL_SPLIT] =            "split",
 242                 [GL_SPLIT_GLOB] =       "split-glob",
 243                 [GL_SOMETHING] =        "split-glob",
 244         };
 245
 246         return string_glob_strs[type];
 247 }
 248
 249 static const char *token_str(enum token_type type)
 250 {
 251         static const char *token_strs[] = {
 252                 [TK_UNSET] =                    "UNSET",
 253                 [TK_RULE] =                     "RULE",
 254
 255                 [TK_M_ACTION] =                 "M ACTION",
 256                 [TK_M_DEVPATH] =                "M DEVPATH",
 257                 [TK_M_KERNEL] =                 "M KERNEL",
 258                 [TK_M_DEVLINK] =                "M DEVLINK",
 259                 [TK_M_NAME] =                   "M NAME",
 260                 [TK_M_ENV] =                    "M ENV",
 261                 [TK_M_TAG] =                    "M TAG",
 262                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 263                 [TK_M_DRIVER] =                 "M DRIVER",
 264                 [TK_M_WAITFOR] =                "M WAITFOR",
 265                 [TK_M_ATTR] =                   "M ATTR",
 266
 267                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 268                 [TK_M_KERNELS] =                "M KERNELS",
 269                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 270                 [TK_M_DRIVERS] =                "M DRIVERS",
 271                 [TK_M_ATTRS] =                  "M ATTRS",
 272                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 273
 274                 [TK_M_TEST] =                   "M TEST",
 275                 [TK_M_PROGRAM] =                "M PROGRAM",
 276                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 277                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 278                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 279                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 280                 [TK_M_RESULT] =                 "M RESULT",
 281                 [TK_M_MAX] =                    "M MAX",
 282
 283                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 284                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 285                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 286                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 287                 [TK_A_OWNER] =                  "A OWNER",
 288                 [TK_A_GROUP] =                  "A GROUP",
 289                 [TK_A_MODE] =                   "A MODE",
 290                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 291                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 292                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 293                 [TK_A_MODE_ID] =                "A MODE_ID",
 294                 [TK_A_ENV] =                    "A ENV",
 295                 [TK_A_TAG] =                    "A ENV",
 296                 [TK_A_NAME] =                   "A NAME",
 297                 [TK_A_DEVLINK] =                "A DEVLINK",
 298                 [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 299                 [TK_A_ATTR] =                   "A ATTR",
 300                 [TK_A_RUN] =                    "A RUN",
 301                 [TK_A_GOTO] =                   "A GOTO",
 302
 303                 [TK_END] =                      "END",
 304         };
 305
 306         return token_strs[type];
 307 }
 308
 309 static void dump_token(struct udev_rules *rules, struct token *token)
 310 {
 311         enum token_type type = token->type;
 312         enum operation_type op = token->key.op;
 313         enum string_glob_type glob = token->key.glob;
 314         const char *value = &rules->buf[token->key.value_off];
 315         const char *attr = &rules->buf[token->key.attr_off];
 316
 317         switch (type) {
 318         case TK_RULE:
 319                 {
 320                         const char *tks_ptr = (char *)rules->tokens;
 321                         const char *tk_ptr = (char *)token;
 322                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 323
 324                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s', flags: 0x%02x\n",
 325                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 326                             idx, token->rule.token_count,
 327                             &rules->buf[token->rule.label_off],
 328                             token->rule.flags);
 329                         break;
 330                 }
 331         case TK_M_ACTION:
 332         case TK_M_DEVPATH:
 333         case TK_M_KERNEL:
 334         case TK_M_SUBSYSTEM:
 335         case TK_M_DRIVER:
 336         case TK_M_WAITFOR:
 337         case TK_M_DEVLINK:
 338         case TK_M_NAME:
 339         case TK_M_KERNELS:
 340         case TK_M_SUBSYSTEMS:
 341         case TK_M_DRIVERS:
 342         case TK_M_PROGRAM:
 343         case TK_M_IMPORT_FILE:
 344         case TK_M_IMPORT_PROG:
 345         case TK_M_IMPORT_DB:
 346         case TK_M_IMPORT_PARENT:
 347         case TK_M_RESULT:
 348         case TK_A_NAME:
 349         case TK_A_DEVLINK:
 350         case TK_A_OWNER:
 351         case TK_A_GROUP:
 352         case TK_A_MODE:
 353         case TK_A_RUN:
 354                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 355                     token_str(type), operation_str(op), value, string_glob_str(glob));
 356                 break;
 357         case TK_M_ATTR:
 358         case TK_M_ATTRS:
 359         case TK_M_ENV:
 360         case TK_A_ATTR:
 361         case TK_A_ENV:
 362                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 363                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 364                 break;
 365         case TK_M_TAG:
 366         case TK_A_TAG:
 367                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 368                 break;
 369         case TK_A_STRING_ESCAPE_NONE:
 370         case TK_A_STRING_ESCAPE_REPLACE:
 371                 dbg(rules->udev, "%s\n", token_str(type));
 372                 break;
 373         case TK_M_TEST:
 374                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 375                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 376                 break;
 377         case TK_A_INOTIFY_WATCH:
 378                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 379                 break;
 380         case TK_A_DEVLINK_PRIO:
 381                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 382                 break;
 383         case TK_A_OWNER_ID:
 384                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 385                 break;
 386         case TK_A_GROUP_ID:
 387                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 388                 break;
 389         case TK_A_MODE_ID:
 390                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 391                 break;
 392         case TK_A_STATIC_NODE:
 393                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 394                 break;
 395         case TK_A_EVENT_TIMEOUT:
 396                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 397                 break;
 398         case TK_A_GOTO:
 399                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 400                 break;
 401         case TK_END:
 402                 dbg(rules->udev, "* %s\n", token_str(type));
 403                 break;
 404         case TK_M_PARENTS_MIN:
 405         case TK_M_PARENTS_MAX:
 406         case TK_M_MAX:
 407         case TK_UNSET:
 408                 dbg(rules->udev, "unknown type %u\n", type);
 409                 break;
 410         }
 411 }
 412
 413 static void dump_rules(struct udev_rules *rules)
 414 {
 415         unsigned int i;
 416
 417         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 418             rules->token_cur,
 419             rules->token_cur * sizeof(struct token),
 420             rules->buf_count,
 421             rules->buf_cur);
 422         for(i = 0; i < rules->token_cur; i++)
 423                 dump_token(rules, &rules->tokens[i]);
 424 }
 425 #else
 426 static inline const char *operation_str(enum operation_type type) { return NULL; }
 427 static inline const char *token_str(enum token_type type) { return NULL; }
 428 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 429 static inline void dump_rules(struct udev_rules *rules) {}
 430 #endif /* ENABLE_DEBUG */
 431
 432 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 433 {
 434         int off;
 435
 436         /* grow buffer if needed */
 437         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 438                 char *buf;
 439                 unsigned int add;
 440
 441                 /* double the buffer size */
 442                 add = rules->buf_max;
 443                 if (add < bytes * 8)
 444                         add = bytes * 8;
 445
 446                 buf = realloc(rules->buf, rules->buf_max + add);
 447                 if (buf == NULL)
 448                         return -1;
 449                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 450                 rules->buf = buf;
 451                 rules->buf_max += add;
 452         }
 453         off = rules->buf_cur;
 454         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 455         rules->buf_cur += bytes;
 456         rules->buf_count++;
 457         return off;
 458 }
 459
 460 static int add_string(struct udev_rules *rules, const char *str)
 461 {
 462         unsigned int node_idx;
 463         struct trie_node *new_node;
 464         unsigned int new_node_idx;
 465         unsigned char key;
 466         unsigned short len;
 467         unsigned int depth;
 468         unsigned int off;
 469         struct trie_node *parent;
 470
 471         /* walk trie, start from last character of str to find matching tails */
 472         len = strlen(str);
 473         key = str[len-1];
 474         node_idx = 0;
 475         for (depth = 0; depth <= len; depth++) {
 476                 struct trie_node *node;
 477                 unsigned int child_idx;
 478
 479                 node = &rules->trie_nodes[node_idx];
 480                 off = node->value_off + node->value_len - len;
 481
 482                 /* match against current node */
 483                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 484                         return off;
 485
 486                 /* lookup child node */
 487                 key = str[len - 1 - depth];
 488                 child_idx = node->child_idx;
 489                 while (child_idx > 0) {
 490                         struct trie_node *child;
 491
 492                         child = &rules->trie_nodes[child_idx];
 493                         if (child->key == key)
 494                                 break;
 495                         child_idx = child->next_child_idx;
 496                 }
 497                 if (child_idx == 0)
 498                         break;
 499                 node_idx = child_idx;
 500         }
 501
 502         /* string not found, add it */
 503         off = add_new_string(rules, str, len + 1);
 504
 505         /* grow trie nodes if needed */
 506         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 507                 struct trie_node *nodes;
 508                 unsigned int add;
 509
 510                 /* double the buffer size */
 511                 add = rules->trie_nodes_max;
 512                 if (add < 8)
 513                         add = 8;
 514
 515                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 516                 if (nodes == NULL)
 517                         return -1;
 518                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 519                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 520                 rules->trie_nodes = nodes;
 521                 rules->trie_nodes_max += add;
 522         }
 523
 524         /* get a new node */
 525         new_node_idx = rules->trie_nodes_cur;
 526         rules->trie_nodes_cur++;
 527         new_node = &rules->trie_nodes[new_node_idx];
 528         memset(new_node, 0x00, sizeof(struct trie_node));
 529         new_node->value_off = off;
 530         new_node->value_len = len;
 531         new_node->key = key;
 532
 533         /* join the parent's child list */
 534         parent = &rules->trie_nodes[node_idx];
 535         if (parent->child_idx == 0) {
 536                 parent->child_idx = new_node_idx;
 537         } else {
 538                 struct trie_node *last_child;
 539
 540                 last_child = &rules->trie_nodes[parent->last_child_idx];
 541                 last_child->next_child_idx = new_node_idx;
 542         }
 543         parent->last_child_idx = new_node_idx;
 544         return off;
 545 }
 546
 547 static int add_token(struct udev_rules *rules, struct token *token)
 548 {
 549         /* grow buffer if needed */
 550         if (rules->token_cur+1 >= rules->token_max) {
 551                 struct token *tokens;
 552                 unsigned int add;
 553
 554                 /* double the buffer size */
 555                 add = rules->token_max;
 556                 if (add < 8)
 557                         add = 8;
 558
 559                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 560                 if (tokens == NULL)
 561                         return -1;
 562                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 563                 rules->tokens = tokens;
 564                 rules->token_max += add;
 565         }
 566         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 567         rules->token_cur++;
 568         return 0;
 569 }
 570
 571 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 572 {
 573         unsigned int i;
 574         uid_t uid;
 575         unsigned int off;
 576
 577         /* lookup, if we know it already */
 578         for (i = 0; i < rules->uids_cur; i++) {
 579                 off = rules->uids[i].name_off;
 580                 if (strcmp(&rules->buf[off], owner) == 0) {
 581                         uid = rules->uids[i].uid;
 582                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 583                         return uid;
 584                 }
 585         }
 586         uid = util_lookup_user(rules->udev, owner);
 587
 588         /* grow buffer if needed */
 589         if (rules->uids_cur+1 >= rules->uids_max) {
 590                 struct uid_gid *uids;
 591                 unsigned int add;
 592
 593                 /* double the buffer size */
 594                 add = rules->uids_max;
 595                 if (add < 1)
 596                         add = 8;
 597
 598                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 599                 if (uids == NULL)
 600                         return uid;
 601                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 602                 rules->uids = uids;
 603                 rules->uids_max += add;
 604         }
 605         rules->uids[rules->uids_cur].uid = uid;
 606         off = add_string(rules, owner);
 607         if (off <= 0)
 608                 return uid;
 609         rules->uids[rules->uids_cur].name_off = off;
 610         rules->uids_cur++;
 611         return uid;
 612 }
 613
 614 static gid_t add_gid(struct udev_rules *rules, const char *group)
 615 {
 616         unsigned int i;
 617         gid_t gid;
 618         unsigned int off;
 619
 620         /* lookup, if we know it already */
 621         for (i = 0; i < rules->gids_cur; i++) {
 622                 off = rules->gids[i].name_off;
 623                 if (strcmp(&rules->buf[off], group) == 0) {
 624                         gid = rules->gids[i].gid;
 625                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 626                         return gid;
 627                 }
 628         }
 629         gid = util_lookup_group(rules->udev, group);
 630
 631         /* grow buffer if needed */
 632         if (rules->gids_cur+1 >= rules->gids_max) {
 633                 struct uid_gid *gids;
 634                 unsigned int add;
 635
 636                 /* double the buffer size */
 637                 add = rules->gids_max;
 638                 if (add < 1)
 639                         add = 8;
 640
 641                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 642                 if (gids == NULL)
 643                         return gid;
 644                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 645                 rules->gids = gids;
 646                 rules->gids_max += add;
 647         }
 648         rules->gids[rules->gids_cur].gid = gid;
 649         off = add_string(rules, group);
 650         if (off <= 0)
 651                 return gid;
 652         rules->gids[rules->gids_cur].name_off = off;
 653         rules->gids_cur++;
 654         return gid;
 655 }
 656
 657 static int import_property_from_string(struct udev_device *dev, char *line)
 658 {
 659         struct udev *udev = udev_device_get_udev(dev);
 660         char *key;
 661         char *val;
 662         size_t len;
 663
 664         /* find key */
 665         key = line;
 666         while (isspace(key[0]))
 667                 key++;
 668
 669         /* comment or empty line */
 670         if (key[0] == '#' || key[0] == '\0')
 671                 return -1;
 672
 673         /* split key/value */
 674         val = strchr(key, '=');
 675         if (val == NULL)
 676                 return -1;
 677         val[0] = '\0';
 678         val++;
 679
 680         /* find value */
 681         while (isspace(val[0]))
 682                 val++;
 683
 684         /* terminate key */
 685         len = strlen(key);
 686         if (len == 0)
 687                 return -1;
 688         while (isspace(key[len-1]))
 689                 len--;
 690         key[len] = '\0';
 691
 692         /* terminate value */
 693         len = strlen(val);
 694         if (len == 0)
 695                 return -1;
 696         while (isspace(val[len-1]))
 697                 len--;
 698         val[len] = '\0';
 699
 700         if (len == 0)
 701                 return -1;
 702
 703         /* unquote */
 704         if (val[0] == '"' || val[0] == '\'') {
 705                 if (val[len-1] != val[0]) {
 706                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 707                         return -1;
 708                 }
 709                 val[len-1] = '\0';
 710                 val++;
 711         }
 712
 713         dbg(udev, "adding '%s'='%s'\n", key, val);
 714
 715         /* handle device, renamed by external tool, returning new path */
 716         if (strcmp(key, "DEVPATH") == 0) {
 717                 char syspath[UTIL_PATH_SIZE];
 718
 719                 info(udev, "updating devpath from '%s' to '%s'\n",
 720                      udev_device_get_devpath(dev), val);
 721                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 722                 udev_device_set_syspath(dev, syspath);
 723         } else {
 724                 struct udev_list_entry *entry;
 725
 726                 entry = udev_device_add_property(dev, key, val);
 727                 /* store in db, skip private keys */
 728                 if (key[0] != '.')
 729                         udev_list_entry_set_flags(entry, 1);
 730         }
 731         return 0;
 732 }
 733
 734 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 735 {
 736         FILE *f;
 737         char line[UTIL_LINE_SIZE];
 738
 739         f = fopen(filename, "r");
 740         if (f == NULL)
 741                 return -1;
 742         while (fgets(line, sizeof(line), f) != NULL)
 743                 import_property_from_string(dev, line);
 744         fclose(f);
 745         return 0;
 746 }
 747
 748 static int import_program_into_properties(struct udev_device *dev, const char *program)
 749 {
 750         struct udev *udev = udev_device_get_udev(dev);
 751         char **envp;
 752         char result[4096];
 753         size_t reslen;
 754         char *line;
 755
 756         envp = udev_device_get_properties_envp(dev);
 757         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL, false) != 0)
 758                 return -1;
 759
 760         line = result;
 761         while (line != NULL) {
 762                 char *pos;
 763
 764                 pos = strchr(line, '\n');
 765                 if (pos != NULL) {
 766                         pos[0] = '\0';
 767                         pos = &pos[1];
 768                 }
 769                 import_property_from_string(dev, line);
 770                 line = pos;
 771         }
 772         return 0;
 773 }
 774
 775 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 776 {
 777         struct udev *udev = udev_device_get_udev(dev);
 778         struct udev_device *dev_parent;
 779         struct udev_list_entry *list_entry;
 780
 781         dev_parent = udev_device_get_parent(dev);
 782         if (dev_parent == NULL)
 783                 return -1;
 784
 785         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 786         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 787                 const char *key = udev_list_entry_get_name(list_entry);
 788                 const char *val = udev_list_entry_get_value(list_entry);
 789
 790                 if (fnmatch(filter, key, 0) == 0) {
 791                         struct udev_list_entry *entry;
 792
 793                         dbg(udev, "import key '%s=%s'\n", key, val);
 794                         entry = udev_device_add_property(dev, key, val);
 795                         /* store in db, skip private keys */
 796                         if (key[0] != '.')
 797                                 udev_list_entry_set_flags(entry, 1);
 798                 }
 799         }
 800         return 0;
 801 }
 802
 803 #define WAIT_LOOP_PER_SECOND            50
 804 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 805 {
 806         struct udev *udev = udev_device_get_udev(dev);
 807         char filepath[UTIL_PATH_SIZE];
 808         char devicepath[UTIL_PATH_SIZE];
 809         struct stat stats;
 810         int loop = timeout * WAIT_LOOP_PER_SECOND;
 811
 812         /* a relative path is a device attribute */
 813         devicepath[0] = '\0';
 814         if (file[0] != '/') {
 815                 util_strscpyl(devicepath, sizeof(devicepath),
 816                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 817                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 818                 file = filepath;
 819         }
 820
 821         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 822         while (--loop) {
 823                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 824
 825                 /* lookup file */
 826                 if (stat(file, &stats) == 0) {
 827                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 828                         return 0;
 829                 }
 830                 /* make sure, the device did not disappear in the meantime */
 831                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 832                         info(udev, "device disappeared while waiting for '%s'\n", file);
 833                         return -2;
 834                 }
 835                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 836                 nanosleep(&duration, NULL);
 837         }
 838         info(udev, "waiting for '%s' failed\n", file);
 839         return -1;
 840 }
 841
 842 static int attr_subst_subdir(char *attr, size_t len)
 843 {
 844         bool found = false;
 845
 846         if (strstr(attr, "/*/")) {
 847                 char *pos;
 848                 char dirname[UTIL_PATH_SIZE];
 849                 const char *tail;
 850                 DIR *dir;
 851
 852                 util_strscpy(dirname, sizeof(dirname), attr);
 853                 pos = strstr(dirname, "/*/");
 854                 if (pos == NULL)
 855                         return -1;
 856                 pos[0] = '\0';
 857                 tail = &pos[2];
 858                 dir = opendir(dirname);
 859                 if (dir != NULL) {
 860                         struct dirent *dent;
 861
 862                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 863                                 struct stat stats;
 864
 865                                 if (dent->d_name[0] == '.')
 866                                         continue;
 867                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 868                                 if (stat(attr, &stats) == 0) {
 869                                         found = true;
 870                                         break;
 871                                 }
 872                         }
 873                         closedir(dir);
 874                 }
 875         }
 876
 877         return found;
 878 }
 879
 880 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 881 {
 882         char *linepos;
 883         char *temp;
 884
 885         linepos = *line;
 886         if (linepos == NULL || linepos[0] == '\0')
 887                 return -1;
 888
 889         /* skip whitespace */
 890         while (isspace(linepos[0]) || linepos[0] == ',')
 891                 linepos++;
 892
 893         /* get the key */
 894         if (linepos[0] == '\0')
 895                 return -1;
 896         *key = linepos;
 897
 898         while (1) {
 899                 linepos++;
 900                 if (linepos[0] == '\0')
 901                         return -1;
 902                 if (isspace(linepos[0]))
 903                         break;
 904                 if (linepos[0] == '=')
 905                         break;
 906                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 907                         if (linepos[1] == '=')
 908                                 break;
 909         }
 910
 911         /* remember end of key */
 912         temp = linepos;
 913
 914         /* skip whitespace after key */
 915         while (isspace(linepos[0]))
 916                 linepos++;
 917         if (linepos[0] == '\0')
 918                 return -1;
 919
 920         /* get operation type */
 921         if (linepos[0] == '=' && linepos[1] == '=') {
 922                 *op = OP_MATCH;
 923                 linepos += 2;
 924         } else if (linepos[0] == '!' && linepos[1] == '=') {
 925                 *op = OP_NOMATCH;
 926                 linepos += 2;
 927         } else if (linepos[0] == '+' && linepos[1] == '=') {
 928                 *op = OP_ADD;
 929                 linepos += 2;
 930         } else if (linepos[0] == '=') {
 931                 *op = OP_ASSIGN;
 932                 linepos++;
 933         } else if (linepos[0] == ':' && linepos[1] == '=') {
 934                 *op = OP_ASSIGN_FINAL;
 935                 linepos += 2;
 936         } else
 937                 return -1;
 938
 939         /* terminate key */
 940         temp[0] = '\0';
 941
 942         /* skip whitespace after operator */
 943         while (isspace(linepos[0]))
 944                 linepos++;
 945         if (linepos[0] == '\0')
 946                 return -1;
 947
 948         /* get the value */
 949         if (linepos[0] == '"')
 950                 linepos++;
 951         else
 952                 return -1;
 953         *value = linepos;
 954
 955         /* terminate */
 956         temp = strchr(linepos, '"');
 957         if (!temp)
 958                 return -1;
 959         temp[0] = '\0';
 960         temp++;
 961         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 962
 963         /* move line to next key */
 964         *line = temp;
 965         return 0;
 966 }
 967
 968 /* extract possible KEY{attr} */
 969 static char *get_key_attribute(struct udev *udev, char *str)
 970 {
 971         char *pos;
 972         char *attr;
 973
 974         attr = strchr(str, '{');
 975         if (attr != NULL) {
 976                 attr++;
 977                 pos = strchr(attr, '}');
 978                 if (pos == NULL) {
 979                         err(udev, "missing closing brace for format\n");
 980                         return NULL;
 981                 }
 982                 pos[0] = '\0';
 983                 dbg(udev, "attribute='%s'\n", attr);
 984                 return attr;
 985         }
 986         return NULL;
 987 }
 988
 989 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 990                         enum operation_type op,
 991                         const char *value, const void *data)
 992 {
 993         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 994         const char *attr = NULL;
 995
 996         memset(token, 0x00, sizeof(struct token));
 997
 998         switch (type) {
 999         case TK_M_ACTION:
1000         case TK_M_DEVPATH:
1001         case TK_M_KERNEL:
1002         case TK_M_SUBSYSTEM:
1003         case TK_M_DRIVER:
1004         case TK_M_WAITFOR:
1005         case TK_M_DEVLINK:
1006         case TK_M_NAME:
1007         case TK_M_KERNELS:
1008         case TK_M_SUBSYSTEMS:
1009         case TK_M_DRIVERS:
1010         case TK_M_PROGRAM:
1011         case TK_M_IMPORT_FILE:
1012         case TK_M_IMPORT_PROG:
1013         case TK_M_IMPORT_DB:
1014         case TK_M_IMPORT_PARENT:
1015         case TK_M_RESULT:
1016         case TK_A_OWNER:
1017         case TK_A_GROUP:
1018         case TK_A_MODE:
1019         case TK_A_NAME:
1020         case TK_A_GOTO:
1021         case TK_M_TAG:
1022         case TK_A_TAG:
1023                 token->key.value_off = add_string(rule_tmp->rules, value);
1024                 break;
1025         case TK_M_ENV:
1026         case TK_M_ATTR:
1027         case TK_M_ATTRS:
1028         case TK_A_ATTR:
1029         case TK_A_ENV:
1030                 attr = data;
1031                 token->key.value_off = add_string(rule_tmp->rules, value);
1032                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1033                 break;
1034         case TK_A_DEVLINK:
1035                 token->key.value_off = add_string(rule_tmp->rules, value);
1036                 token->key.devlink_unique = *(int *)data;
1037                 break;
1038         case TK_M_TEST:
1039                 token->key.value_off = add_string(rule_tmp->rules, value);
1040                 if (data != NULL)
1041                         token->key.mode = *(mode_t *)data;
1042                 break;
1043         case TK_A_STRING_ESCAPE_NONE:
1044         case TK_A_STRING_ESCAPE_REPLACE:
1045                 break;
1046         case TK_A_RUN:
1047                 token->key.value_off = add_string(rule_tmp->rules, value);
1048                 token->key.fail_on_error = *(int *)data;
1049                 break;
1050         case TK_A_INOTIFY_WATCH:
1051         case TK_A_DEVLINK_PRIO:
1052                 token->key.devlink_prio = *(int *)data;
1053                 break;
1054         case TK_A_OWNER_ID:
1055                 token->key.uid = *(uid_t *)data;
1056                 break;
1057         case TK_A_GROUP_ID:
1058                 token->key.gid = *(gid_t *)data;
1059                 break;
1060         case TK_A_MODE_ID:
1061                 token->key.mode = *(mode_t *)data;
1062                 break;
1063         case TK_A_STATIC_NODE:
1064                 token->key.value_off = add_string(rule_tmp->rules, value);
1065                 break;
1066         case TK_A_EVENT_TIMEOUT:
1067                 token->key.event_timeout = *(int *)data;
1068                 break;
1069         case TK_RULE:
1070         case TK_M_PARENTS_MIN:
1071         case TK_M_PARENTS_MAX:
1072         case TK_M_MAX:
1073         case TK_END:
1074         case TK_UNSET:
1075                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1076                 return -1;
1077         }
1078
1079         if (value != NULL && type < TK_M_MAX) {
1080                 /* check if we need to split or call fnmatch() while matching rules */
1081                 enum string_glob_type glob;
1082                 int has_split;
1083                 int has_glob;
1084
1085                 has_split = (strchr(value, '|') != NULL);
1086                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1087                 if (has_split && has_glob) {
1088                         glob = GL_SPLIT_GLOB;
1089                 } else if (has_split) {
1090                         glob = GL_SPLIT;
1091                 } else if (has_glob) {
1092                         if (strcmp(value, "?*") == 0)
1093                                 glob = GL_SOMETHING;
1094                         else
1095                                 glob = GL_GLOB;
1096                 } else {
1097                         glob = GL_PLAIN;
1098                 }
1099                 token->key.glob = glob;
1100         }
1101
1102         if (value != NULL && type > TK_M_MAX) {
1103                 /* check if assigned value has substitution chars */
1104                 if (value[0] == '[')
1105                         token->key.subst = SB_SUBSYS;
1106                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1107                         token->key.subst = SB_FORMAT;
1108                 else
1109                         token->key.subst = SB_NONE;
1110         }
1111
1112         if (attr != NULL) {
1113                 /* check if property/attribut name has substitution chars */
1114                 if (attr[0] == '[')
1115                         token->key.attrsubst = SB_SUBSYS;
1116                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1117                         token->key.attrsubst = SB_FORMAT;
1118                 else
1119                         token->key.attrsubst = SB_NONE;
1120         }
1121
1122         token->key.type = type;
1123         token->key.op = op;
1124         rule_tmp->token_cur++;
1125         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1126                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1127                 return -1;
1128         }
1129         return 0;
1130 }
1131
1132 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1133 {
1134         unsigned int i;
1135         unsigned int start = 0;
1136         unsigned int end = rule_tmp->token_cur;
1137
1138         for (i = 0; i < rule_tmp->token_cur; i++) {
1139                 enum token_type next_val = TK_UNSET;
1140                 unsigned int next_idx = 0;
1141                 unsigned int j;
1142
1143                 /* find smallest value */
1144                 for (j = start; j < end; j++) {
1145                         if (rule_tmp->token[j].type == TK_UNSET)
1146                                 continue;
1147                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1148                                 next_val = rule_tmp->token[j].type;
1149                                 next_idx = j;
1150                         }
1151                 }
1152
1153                 /* add token and mark done */
1154                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1155                         return -1;
1156                 rule_tmp->token[next_idx].type = TK_UNSET;
1157
1158                 /* shrink range */
1159                 if (next_idx == start)
1160                         start++;
1161                 if (next_idx+1 == end)
1162                         end--;
1163         }
1164         return 0;
1165 }
1166
1167 static int add_rule(struct udev_rules *rules, char *line,
1168                     const char *filename, unsigned int filename_off, unsigned int lineno)
1169 {
1170         char *linepos;
1171         char *attr;
1172         struct rule_tmp rule_tmp;
1173         bool bus_warn = false;
1174         bool sysfs_warn = false;
1175         bool id_warn = false;
1176
1177         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1178         rule_tmp.rules = rules;
1179         rule_tmp.rule.type = TK_RULE;
1180         rule_tmp.rule.rule.filename_off = filename_off;
1181         rule_tmp.rule.rule.filename_line = lineno;
1182
1183         linepos = line;
1184         while (1) {
1185                 char *key;
1186                 char *value;
1187                 enum operation_type op;
1188
1189                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1190                         break;
1191
1192                 if (strcmp(key, "ACTION") == 0) {
1193                         if (op > OP_MATCH_MAX) {
1194                                 err(rules->udev, "invalid ACTION operation\n");
1195                                 goto invalid;
1196                         }
1197                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1198                         continue;
1199                 }
1200
1201                 if (strcmp(key, "DEVPATH") == 0) {
1202                         if (op > OP_MATCH_MAX) {
1203                                 err(rules->udev, "invalid DEVPATH operation\n");
1204                                 goto invalid;
1205                         }
1206                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1207                         continue;
1208                 }
1209
1210                 if (strcmp(key, "KERNEL") == 0) {
1211                         if (op > OP_MATCH_MAX) {
1212                                 err(rules->udev, "invalid KERNEL operation\n");
1213                                 goto invalid;
1214                         }
1215                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1216                         continue;
1217                 }
1218
1219                 if (strcmp(key, "SUBSYSTEM") == 0) {
1220                         if (op > OP_MATCH_MAX) {
1221                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1222                                 goto invalid;
1223                         }
1224                         /* bus, class, subsystem events should all be the same */
1225                         if (strcmp(value, "subsystem") == 0 ||
1226                             strcmp(value, "bus") == 0 ||
1227                             strcmp(value, "class") == 0) {
1228                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1229                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1230                                             "please fix it in %s:%u", value, filename, lineno);
1231                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1232                         } else
1233                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1234                         continue;
1235                 }
1236
1237                 if (strcmp(key, "DRIVER") == 0) {
1238                         if (op > OP_MATCH_MAX) {
1239                                 err(rules->udev, "invalid DRIVER operation\n");
1240                                 goto invalid;
1241                         }
1242                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1243                         continue;
1244                 }
1245
1246                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1247                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1248                         if (attr == NULL) {
1249                                 err(rules->udev, "error parsing ATTR attribute\n");
1250                                 goto invalid;
1251                         }
1252                         if (op < OP_MATCH_MAX) {
1253                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1254                         } else {
1255                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1256                         }
1257                         continue;
1258                 }
1259
1260                 if (strcmp(key, "KERNELS") == 0) {
1261                         if (op > OP_MATCH_MAX) {
1262                                 err(rules->udev, "invalid KERNELS operation\n");
1263                                 goto invalid;
1264                         }
1265                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1266                         continue;
1267                 }
1268
1269                 if (strcmp(key, "ID") == 0) {
1270                         if (!id_warn) {
1271                                 id_warn = true;
1272                                 err(rules->udev, "ID= will be removed in a future udev version, "
1273                                     "please use KERNEL= to match the event device, or KERNELS= "
1274                                     "to match a parent device, in %s:%u\n", filename, lineno);
1275                         }
1276                         if (op > OP_MATCH_MAX) {
1277                                 err(rules->udev, "invalid KERNELS operation\n");
1278                                 goto invalid;
1279                         }
1280                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1281                         continue;
1282                 }
1283
1284                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1285                         if (op > OP_MATCH_MAX) {
1286                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1287                                 goto invalid;
1288                         }
1289                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1290                         continue;
1291                 }
1292
1293                 if (strcmp(key, "BUS") == 0) {
1294                         if (!bus_warn) {
1295                                 bus_warn = true;
1296                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1297                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1298                                     "to match a parent device, in %s:%u\n", filename, lineno);
1299                         }
1300                         if (op > OP_MATCH_MAX) {
1301                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1302                                 goto invalid;
1303                         }
1304                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1305                         continue;
1306                 }
1307
1308                 if (strcmp(key, "DRIVERS") == 0) {
1309                         if (op > OP_MATCH_MAX) {
1310                                 err(rules->udev, "invalid DRIVERS operation\n");
1311                                 goto invalid;
1312                         }
1313                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1314                         continue;
1315                 }
1316
1317                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1318                         if (op > OP_MATCH_MAX) {
1319                                 err(rules->udev, "invalid ATTRS operation\n");
1320                                 goto invalid;
1321                         }
1322                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1323                         if (attr == NULL) {
1324                                 err(rules->udev, "error parsing ATTRS attribute\n");
1325                                 goto invalid;
1326                         }
1327                         if (strncmp(attr, "device/", 7) == 0)
1328                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1329                                     "please fix it in %s:%u", filename, lineno);
1330                         else if (strstr(attr, "../") != NULL)
1331                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1332                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1333                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1334                         continue;
1335                 }
1336
1337                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1338                         if (!sysfs_warn) {
1339                                 sysfs_warn = true;
1340                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1341                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1342                                     "to match a parent device, in %s:%u\n", filename, lineno);
1343                         }
1344                         if (op > OP_MATCH_MAX) {
1345                                 err(rules->udev, "invalid ATTRS operation\n");
1346                                 goto invalid;
1347                         }
1348                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1349                         if (attr == NULL) {
1350                                 err(rules->udev, "error parsing ATTRS attribute\n");
1351                                 goto invalid;
1352                         }
1353                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1354                         continue;
1355                 }
1356
1357                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1358                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1359                         if (attr == NULL) {
1360                                 err(rules->udev, "error parsing ENV attribute\n");
1361                                 goto invalid;
1362                         }
1363                         if (op < OP_MATCH_MAX) {
1364                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1365                                         goto invalid;
1366                         } else {
1367                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1368                                         goto invalid;
1369                         }
1370                         continue;
1371                 }
1372
1373                 if (strcmp(key, "TAG") == 0) {
1374                         if (op < OP_MATCH_MAX)
1375                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1376                         else
1377                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1378                         continue;
1379                 }
1380
1381                 if (strcmp(key, "PROGRAM") == 0) {
1382                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1383                         continue;
1384                 }
1385
1386                 if (strcmp(key, "RESULT") == 0) {
1387                         if (op > OP_MATCH_MAX) {
1388                                 err(rules->udev, "invalid RESULT operation\n");
1389                                 goto invalid;
1390                         }
1391                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1392                         continue;
1393                 }
1394
1395                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1396                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1397                         if (attr != NULL && strstr(attr, "program")) {
1398                                 dbg(rules->udev, "IMPORT will be executed\n");
1399                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1400                         } else if (attr != NULL && strstr(attr, "file")) {
1401                                 dbg(rules->udev, "IMPORT will be included as file\n");
1402                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1403                         } else if (attr != NULL && strstr(attr, "db")) {
1404                                 dbg(rules->udev, "IMPORT will include db values\n");
1405                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1406                         } else if (attr != NULL && strstr(attr, "parent")) {
1407                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1408                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1409                         } else {
1410                                 /* figure it out if it is executable */
1411                                 char file[UTIL_PATH_SIZE];
1412                                 char *pos;
1413                                 struct stat statbuf;
1414
1415                                 /* allow programs in /lib/udev called without the path */
1416                                 if (value[0] != '/')
1417                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1418                                 else
1419                                         util_strscpy(file, sizeof(file), value);
1420                                 pos = strchr(file, ' ');
1421                                 if (pos)
1422                                         pos[0] = '\0';
1423                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1424                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1425                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1426                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1427                                 } else {
1428                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1429                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1430                                 }
1431                         }
1432                         continue;
1433                 }
1434
1435                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1436                         mode_t mode = 0;
1437
1438                         if (op > OP_MATCH_MAX) {
1439                                 err(rules->udev, "invalid TEST operation\n");
1440                                 goto invalid;
1441                         }
1442                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1443                         if (attr != NULL) {
1444                                 mode = strtol(attr, NULL, 8);
1445                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1446                         } else {
1447                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1448                         }
1449                         continue;
1450                 }
1451
1452                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1453                         int flag = 0;
1454
1455                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1456                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1457                                 flag = 1;
1458                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1459                         continue;
1460                 }
1461
1462                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1463                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1464                         continue;
1465                 }
1466
1467                 if (strcmp(key, "LABEL") == 0) {
1468                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1469                         continue;
1470                 }
1471
1472                 if (strcmp(key, "GOTO") == 0) {
1473                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1474                         continue;
1475                 }
1476
1477                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1478                         if (op < OP_MATCH_MAX) {
1479                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1480                         } else {
1481                                 if (strcmp(value, "%k") == 0) {
1482                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1483                                             "please remove it from %s:%u\n", filename, lineno);
1484                                         continue;
1485                                 }
1486                                 if (value[0] == '\0') {
1487                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1488                                              "please remove it from %s:%u\n", filename, lineno);
1489                                         continue;
1490                                 }
1491                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1492                         }
1493                         rule_tmp.rule.rule.can_set_name = true;
1494                         continue;
1495                 }
1496
1497                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1498                         if (op < OP_MATCH_MAX) {
1499                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1500                         } else {
1501                                 int flag = 0;
1502
1503                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1504                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1505                                         flag = 1;
1506                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1507                         }
1508                         rule_tmp.rule.rule.can_set_name = true;
1509                         continue;
1510                 }
1511
1512                 if (strcmp(key, "OWNER") == 0) {
1513                         uid_t uid;
1514                         char *endptr;
1515
1516                         uid = strtoul(value, &endptr, 10);
1517                         if (endptr[0] == '\0') {
1518                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1519                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1520                                 uid = add_uid(rules, value);
1521                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1522                         } else if (rules->resolve_names >= 0) {
1523                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1524                         }
1525                         rule_tmp.rule.rule.can_set_name = true;
1526                         continue;
1527                 }
1528
1529                 if (strcmp(key, "GROUP") == 0) {
1530                         gid_t gid;
1531                         char *endptr;
1532
1533                         gid = strtoul(value, &endptr, 10);
1534                         if (endptr[0] == '\0') {
1535                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1536                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1537                                 gid = add_gid(rules, value);
1538                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1539                         } else if (rules->resolve_names >= 0) {
1540                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1541                         }
1542                         rule_tmp.rule.rule.can_set_name = true;
1543                         continue;
1544                 }
1545
1546                 if (strcmp(key, "MODE") == 0) {
1547                         mode_t mode;
1548                         char *endptr;
1549
1550                         mode = strtol(value, &endptr, 8);
1551                         if (endptr[0] == '\0')
1552                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1553                         else
1554                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1555                         rule_tmp.rule.rule.can_set_name = true;
1556                         continue;
1557                 }
1558
1559                 if (strcmp(key, "OPTIONS") == 0) {
1560                         const char *pos;
1561
1562                         pos = strstr(value, "link_priority=");
1563                         if (pos != NULL) {
1564                                 int prio = atoi(&pos[strlen("link_priority=")]);
1565
1566                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1567                                 dbg(rules->udev, "link priority=%i\n", prio);
1568                         }
1569                         pos = strstr(value, "event_timeout=");
1570                         if (pos != NULL) {
1571                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1572
1573                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1574                                 dbg(rules->udev, "event timeout=%i\n", tout);
1575                         }
1576                         pos = strstr(value, "string_escape=");
1577                         if (pos != NULL) {
1578                                 pos = &pos[strlen("string_escape=")];
1579                                 if (strncmp(pos, "none", strlen("none")) == 0)
1580                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1581                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1582                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1583                         }
1584                         pos = strstr(value, "nowatch");
1585                         if (pos != NULL) {
1586                                 const int off = 0;
1587
1588                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &off);
1589                                 dbg(rules->udev, "inotify watch of device disabled\n");
1590                         } else {
1591                                 pos = strstr(value, "watch");
1592                                 if (pos != NULL) {
1593                                         const int on = 1;
1594
1595                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &on);
1596                                         dbg(rules->udev, "inotify watch of device requested\n");
1597                                 }
1598                         }
1599                         pos = strstr(value, "static_node=");
1600                         if (pos != NULL) {
1601                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, 0, &pos[strlen("static_node=")], NULL);
1602                                 rule_tmp.rule.rule.has_static_node = true;
1603                         }
1604                         continue;
1605                 }
1606                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1607         }
1608
1609         /* add rule token */
1610         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1611         if (add_token(rules, &rule_tmp.rule) != 0)
1612                 goto invalid;
1613
1614         /* add tokens to list, sorted by type */
1615         if (sort_token(rules, &rule_tmp) != 0)
1616                 goto invalid;
1617
1618         return 0;
1619 invalid:
1620         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1621         return -1;
1622 }
1623
1624 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1625 {
1626         FILE *f;
1627         unsigned int first_token;
1628         char line[UTIL_LINE_SIZE];
1629         int line_nr = 0;
1630         unsigned int i;
1631
1632         info(rules->udev, "reading '%s' as rules file\n", filename);
1633
1634         f = fopen(filename, "r");
1635         if (f == NULL)
1636                 return -1;
1637
1638         first_token = rules->token_cur;
1639
1640         while (fgets(line, sizeof(line), f) != NULL) {
1641                 char *key;
1642                 size_t len;
1643
1644                 /* skip whitespace */
1645                 line_nr++;
1646                 key = line;
1647                 while (isspace(key[0]))
1648                         key++;
1649
1650                 /* comment */
1651                 if (key[0] == '#')
1652                         continue;
1653
1654                 len = strlen(line);
1655                 if (len < 3)
1656                         continue;
1657
1658                 /* continue reading if backslash+newline is found */
1659                 while (line[len-2] == '\\') {
1660                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1661                                 break;
1662                         if (strlen(&line[len-2]) < 2)
1663                                 break;
1664                         line_nr++;
1665                         len = strlen(line);
1666                 }
1667
1668                 if (len+1 >= sizeof(line)) {
1669                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1670                         continue;
1671                 }
1672                 add_rule(rules, key, filename, filename_off, line_nr);
1673         }
1674         fclose(f);
1675
1676         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1677         for (i = first_token+1; i < rules->token_cur; i++) {
1678                 if (rules->tokens[i].type == TK_A_GOTO) {
1679                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1680                         unsigned int j;
1681
1682                         for (j = i+1; j < rules->token_cur; j++) {
1683                                 if (rules->tokens[j].type != TK_RULE)
1684                                         continue;
1685                                 if (rules->tokens[j].rule.label_off == 0)
1686                                         continue;
1687                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1688                                         continue;
1689                                 rules->tokens[i].key.rule_goto = j;
1690                                 break;
1691                         }
1692                         if (rules->tokens[i].key.rule_goto == 0)
1693                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1694                 }
1695         }
1696         return 0;
1697 }
1698
1699 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1700 {
1701         DIR *dir;
1702         char filename[UTIL_PATH_SIZE];
1703
1704         dbg(udev, "open directory '%s'\n", dirname);
1705         dir = opendir(dirname);
1706         if (dir == NULL) {
1707                 info(udev, "unable to open '%s': %m\n", dirname);
1708                 return -1;
1709         }
1710
1711         while (1) {
1712                 struct dirent *dent;
1713
1714                 dent = readdir(dir);
1715                 if (dent == NULL || dent->d_name[0] == '\0')
1716                         break;
1717
1718                 if (dent->d_name[0] == '.')
1719                         continue;
1720
1721                 /* look for file matching with specified suffix */
1722                 if (suffix != NULL) {
1723                         const char *ext;
1724
1725                         ext = strrchr(dent->d_name, '.');
1726                         if (ext == NULL)
1727                                 continue;
1728                         if (strcmp(ext, suffix) != 0)
1729                                 continue;
1730                 }
1731                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1732                 dbg(udev, "put file '%s' into list\n", filename);
1733                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1734         }
1735
1736         closedir(dir);
1737         return 0;
1738 }
1739
1740 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1741 {
1742         struct udev_rules *rules;
1743         struct stat statbuf;
1744         struct udev_list_node file_list;
1745         struct udev_list_entry *file_loop, *file_tmp;
1746         struct token end_token;
1747
1748         rules = malloc(sizeof(struct udev_rules));
1749         if (rules == NULL)
1750                 return NULL;
1751         memset(rules, 0x00, sizeof(struct udev_rules));
1752         rules->udev = udev;
1753         rules->resolve_names = resolve_names;
1754         udev_list_init(&file_list);
1755
1756         /* init token array and string buffer */
1757         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1758         if (rules->tokens == NULL)
1759                 return NULL;
1760         rules->token_max = PREALLOC_TOKEN;
1761
1762         rules->buf = malloc(PREALLOC_STRBUF);
1763         if (rules->buf == NULL)
1764                 return NULL;
1765         rules->buf_max = PREALLOC_STRBUF;
1766         /* offset 0 is always '\0' */
1767         rules->buf[0] = '\0';
1768         rules->buf_cur = 1;
1769         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1770             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1771
1772         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1773         if (rules->trie_nodes == NULL)
1774                 return NULL;
1775         rules->trie_nodes_max = PREALLOC_TRIE;
1776         /* offset 0 is the trie root, with an empty string */
1777         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1778         rules->trie_nodes_cur = 1;
1779
1780         if (udev_get_rules_path(udev) != NULL) {
1781                 /* custom rules location for testing */
1782                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1783         } else {
1784                 char filename[PATH_MAX];
1785                 struct udev_list_node sort_list;
1786                 struct udev_list_entry *sort_loop, *sort_tmp;
1787
1788                 /* read user/custom rules */
1789                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1790
1791                 /* read dynamic/temporary rules */
1792                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1793                 udev_list_init(&sort_list);
1794                 add_matching_files(udev, &sort_list, filename, ".rules");
1795
1796                 /* read default rules */
1797                 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1798
1799                 /* sort all rules files by basename into list of files */
1800                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1801                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1802                         const char *sort_base = strrchr(sort_name, '/');
1803
1804                         if (sort_base == NULL)
1805                                 continue;
1806                         /* sort entry into existing list */
1807                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1808                                 const char *file_name = udev_list_entry_get_name(file_loop);
1809                                 const char *file_base = strrchr(file_name, '/');
1810
1811                                 if (file_base == NULL)
1812                                         continue;
1813                                 if (strcmp(file_base, sort_base) == 0) {
1814                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1815                                              file_name, sort_name);
1816                                         udev_list_entry_delete(sort_loop);
1817                                         sort_loop = NULL;
1818                                         break;
1819                                 }
1820                                 if (strcmp(file_base, sort_base) > 0) {
1821                                         /* found later file, insert before */
1822                                         udev_list_entry_remove(sort_loop);
1823                                         udev_list_entry_insert_before(sort_loop, file_loop);
1824                                         sort_loop = NULL;
1825                                         break;
1826                                 }
1827                         }
1828                         /* current file already handled */
1829                         if (sort_loop == NULL)
1830                                 continue;
1831                         /* no later file, append to end of list */
1832                         udev_list_entry_remove(sort_loop);
1833                         udev_list_entry_append(sort_loop, &file_list);
1834                 }
1835         }
1836
1837         /* add all filenames to the string buffer */
1838         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1839                 const char *filename = udev_list_entry_get_name(file_loop);
1840                 unsigned int filename_off;
1841
1842                 filename_off = add_string(rules, filename);
1843                 /* the offset in the rule is limited to unsigned short */
1844                 if (filename_off < USHRT_MAX)
1845                         udev_list_entry_set_flags(file_loop, filename_off);
1846         }
1847
1848         /* parse list of files */
1849         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1850                 const char *filename = udev_list_entry_get_name(file_loop);
1851                 unsigned int filename_off = udev_list_entry_get_flags(file_loop);
1852
1853                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1854                         parse_file(rules, filename, filename_off);
1855                 else
1856                         err(udev, "can not read '%s'\n", filename);
1857                 udev_list_entry_delete(file_loop);
1858         }
1859
1860         memset(&end_token, 0x00, sizeof(struct token));
1861         end_token.type = TK_END;
1862         add_token(rules, &end_token);
1863
1864         /* shrink allocated token and string buffer */
1865         if (rules->token_cur < rules->token_max) {
1866                 struct token *tokens;
1867
1868                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1869                 if (tokens != NULL || rules->token_cur == 0) {
1870                         rules->tokens = tokens;
1871                         rules->token_max = rules->token_cur;
1872                 }
1873         }
1874         if (rules->buf_cur < rules->buf_max) {
1875                 char *buf;
1876
1877                 buf = realloc(rules->buf, rules->buf_cur);
1878                 if (buf != NULL || rules->buf_cur == 0) {
1879                         rules->buf = buf;
1880                         rules->buf_max = rules->buf_cur;
1881                 }
1882         }
1883         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1884              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1885         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1886              rules->trie_nodes_cur * sizeof(struct trie_node),
1887              rules->trie_nodes_cur, sizeof(struct trie_node));
1888
1889         /* cleanup trie */
1890         free(rules->trie_nodes);
1891         rules->trie_nodes = NULL;
1892         rules->trie_nodes_cur = 0;
1893         rules->trie_nodes_max = 0;
1894
1895         /* cleanup uid/gid cache */
1896         free(rules->uids);
1897         rules->uids = NULL;
1898         rules->uids_cur = 0;
1899         rules->uids_max = 0;
1900         free(rules->gids);
1901         rules->gids = NULL;
1902         rules->gids_cur = 0;
1903         rules->gids_max = 0;
1904
1905         dump_rules(rules);
1906         return rules;
1907 }
1908
1909 void udev_rules_unref(struct udev_rules *rules)
1910 {
1911         if (rules == NULL)
1912                 return;
1913         free(rules->tokens);
1914         free(rules->buf);
1915         free(rules->trie_nodes);
1916         free(rules->uids);
1917         free(rules->gids);
1918         free(rules);
1919 }
1920
1921 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1922 {
1923         char *key_value = &rules->buf[token->key.value_off];
1924         char *pos;
1925         bool match = false;
1926
1927         if (val == NULL)
1928                 val = "";
1929
1930         switch (token->key.glob) {
1931         case GL_PLAIN:
1932                 match = (strcmp(key_value, val) == 0);
1933                 break;
1934         case GL_GLOB:
1935                 match = (fnmatch(key_value, val, 0) == 0);
1936                 break;
1937         case GL_SPLIT:
1938                 {
1939                         const char *split;
1940                         size_t len;
1941
1942                         split = &rules->buf[token->key.value_off];
1943                         len = strlen(val);
1944                         while (1) {
1945                                 const char *next;
1946
1947                                 next = strchr(split, '|');
1948                                 if (next != NULL) {
1949                                         size_t matchlen = (size_t)(next - split);
1950
1951                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1952                                         if (match)
1953                                                 break;
1954                                 } else {
1955                                         match = (strcmp(split, val) == 0);
1956                                         break;
1957                                 }
1958                                 split = &next[1];
1959                         }
1960                         break;
1961                 }
1962         case GL_SPLIT_GLOB:
1963                 {
1964                         char value[UTIL_PATH_SIZE];
1965
1966                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1967                         key_value = value;
1968                         while (key_value != NULL) {
1969                                 pos = strchr(key_value, '|');
1970                                 if (pos != NULL) {
1971                                         pos[0] = '\0';
1972                                         pos = &pos[1];
1973                                 }
1974                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1975                                 match = (fnmatch(key_value, val, 0) == 0);
1976                                 if (match)
1977                                         break;
1978                                 key_value = pos;
1979                         }
1980                         break;
1981                 }
1982         case GL_SOMETHING:
1983                 match = (val[0] != '\0');
1984                 break;
1985         case GL_UNSET:
1986                 return -1;
1987         }
1988
1989         if (match && (token->key.op == OP_MATCH)) {
1990                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1991                 return 0;
1992         }
1993         if (!match && (token->key.op == OP_NOMATCH)) {
1994                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1995                 return 0;
1996         }
1997         dbg(rules->udev, "%s is not true\n", token_str(token->type));
1998         return -1;
1999 }
2000
2001 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
2002 {
2003         const char *name;
2004         char nbuf[UTIL_NAME_SIZE];
2005         const char *value;
2006         char vbuf[UTIL_NAME_SIZE];
2007         size_t len;
2008
2009         name = &rules->buf[cur->key.attr_off];
2010         switch (cur->key.attrsubst) {
2011         case SB_FORMAT:
2012                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2013                 name = nbuf;
2014                 /* fall through */
2015         case SB_NONE:
2016                 value = udev_device_get_sysattr_value(dev, name);
2017                 if (value == NULL)
2018                         return -1;
2019                 break;
2020         case SB_SUBSYS:
2021                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2022                         return -1;
2023                 value = vbuf;
2024                 break;
2025         default:
2026                 return -1;
2027         }
2028
2029         /* remove trailing whitespace, if not asked to match for it */
2030         len = strlen(value);
2031         if (len > 0 && isspace(value[len-1])) {
2032                 const char *key_value;
2033                 size_t klen;
2034
2035                 key_value = &rules->buf[cur->key.value_off];
2036                 klen = strlen(key_value);
2037                 if (klen > 0 && !isspace(key_value[klen-1])) {
2038                         if (value != vbuf) {
2039                                 util_strscpy(vbuf, sizeof(vbuf), value);
2040                                 value = vbuf;
2041                         }
2042                         while (len > 0 && isspace(vbuf[--len]))
2043                                 vbuf[len] = '\0';
2044                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2045                 }
2046         }
2047
2048         return match_key(rules, cur, value);
2049 }
2050
2051 enum escape_type {
2052         ESCAPE_UNSET,
2053         ESCAPE_NONE,
2054         ESCAPE_REPLACE,
2055 };
2056
2057 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2058 {
2059         struct token *cur;
2060         struct token *rule;
2061         enum escape_type esc = ESCAPE_UNSET;
2062         bool can_set_name;
2063
2064         if (rules->tokens == NULL)
2065                 return -1;
2066
2067         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2068                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2069                          strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
2070
2071         /* loop through token list, match, run actions or forward to next rule */
2072         cur = &rules->tokens[0];
2073         rule = cur;
2074         for (;;) {
2075                 dump_token(rules, cur);
2076                 switch (cur->type) {
2077                 case TK_RULE:
2078                         /* current rule */
2079                         rule = cur;
2080                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2081                         if (!can_set_name && rule->rule.can_set_name)
2082                                 goto nomatch;
2083                         esc = ESCAPE_UNSET;
2084                         break;
2085                 case TK_M_ACTION:
2086                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2087                                 goto nomatch;
2088                         break;
2089                 case TK_M_DEVPATH:
2090                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2091                                 goto nomatch;
2092                         break;
2093                 case TK_M_KERNEL:
2094                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2095                                 goto nomatch;
2096                         break;
2097                 case TK_M_DEVLINK:
2098                         {
2099                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2100                                 struct udev_list_entry *list_entry;
2101                                 bool match = false;
2102
2103                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2104                                         const char *devlink;
2105
2106                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2107                                         if (match_key(rules, cur, devlink) == 0) {
2108                                                 match = true;
2109                                                 break;
2110                                         }
2111                                 }
2112                                 if (!match)
2113                                         goto nomatch;
2114                                 break;
2115                         }
2116                 case TK_M_NAME:
2117                         if (match_key(rules, cur, event->name) != 0)
2118                                 goto nomatch;
2119                         break;
2120                 case TK_M_ENV:
2121                         {
2122                                 const char *key_name = &rules->buf[cur->key.attr_off];
2123                                 const char *value;
2124
2125                                 value = udev_device_get_property_value(event->dev, key_name);
2126                                 if (value == NULL) {
2127                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2128                                         value = "";
2129                                 }
2130                                 if (match_key(rules, cur, value))
2131                                         goto nomatch;
2132                                 break;
2133                         }
2134                 case TK_M_TAG:
2135                         {
2136                                 struct udev_list_entry *list_entry;
2137                                 bool match = false;
2138
2139                                 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2140                                         if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2141                                                 match = true;
2142                                                 break;
2143                                         }
2144                                 }
2145                                 if (!match && (cur->key.op != OP_NOMATCH))
2146                                         goto nomatch;
2147                                 break;
2148                         }
2149                 case TK_M_SUBSYSTEM:
2150                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2151                                 goto nomatch;
2152                         break;
2153                 case TK_M_DRIVER:
2154                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2155                                 goto nomatch;
2156                         break;
2157                 case TK_M_WAITFOR:
2158                         {
2159                                 char filename[UTIL_PATH_SIZE];
2160                                 int found;
2161
2162                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2163                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2164                                 if (!found && (cur->key.op != OP_NOMATCH))
2165                                         goto nomatch;
2166                                 break;
2167                         }
2168                 case TK_M_ATTR:
2169                         if (match_attr(rules, event->dev, event, cur) != 0)
2170                                 goto nomatch;
2171                         break;
2172                 case TK_M_KERNELS:
2173                 case TK_M_SUBSYSTEMS:
2174                 case TK_M_DRIVERS:
2175                 case TK_M_ATTRS:
2176                         {
2177                                 struct token *next;
2178
2179                                 /* get whole sequence of parent matches */
2180                                 next = cur;
2181                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2182                                         next++;
2183
2184                                 /* loop over parents */
2185                                 event->dev_parent = event->dev;
2186                                 while (1) {
2187                                         struct token *key;
2188
2189                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2190                                         /* loop over sequence of parent match keys */
2191                                         for (key = cur; key < next; key++ ) {
2192                                                 dump_token(rules, key);
2193                                                 switch(key->type) {
2194                                                 case TK_M_KERNELS:
2195                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2196                                                                 goto try_parent;
2197                                                         break;
2198                                                 case TK_M_SUBSYSTEMS:
2199                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2200                                                                 goto try_parent;
2201                                                         break;
2202                                                 case TK_M_DRIVERS:
2203                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2204                                                                 goto try_parent;
2205                                                         break;
2206                                                 case TK_M_ATTRS:
2207                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2208                                                                 goto try_parent;
2209                                                         break;
2210                                                 default:
2211                                                         goto nomatch;
2212                                                 }
2213                                                 dbg(event->udev, "parent key matched\n");
2214                                         }
2215                                         dbg(event->udev, "all parent keys matched\n");
2216                                         /* all keys matched */
2217                                         break;
2218
2219                                 try_parent:
2220                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2221                                         if (event->dev_parent == NULL)
2222                                                 goto nomatch;
2223                                 }
2224                                 /* move behind our sequence of parent match keys */
2225                                 cur = next;
2226                                 continue;
2227                         }
2228                 case TK_M_TEST:
2229                         {
2230                                 char filename[UTIL_PATH_SIZE];
2231                                 struct stat statbuf;
2232                                 int match;
2233
2234                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2235                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2236                                         if (filename[0] != '/') {
2237                                                 char tmp[UTIL_PATH_SIZE];
2238
2239                                                 util_strscpy(tmp, sizeof(tmp), filename);
2240                                                 util_strscpyl(filename, sizeof(filename),
2241                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2242                                         }
2243                                 }
2244                                 attr_subst_subdir(filename, sizeof(filename));
2245
2246                                 match = (stat(filename, &statbuf) == 0);
2247                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2248                                 if (match && cur->key.mode > 0) {
2249                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2250                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2251                                             match ? "matches" : "does not match", cur->key.mode);
2252                                 }
2253                                 if (match && cur->key.op == OP_NOMATCH)
2254                                         goto nomatch;
2255                                 if (!match && cur->key.op == OP_MATCH)
2256                                         goto nomatch;
2257                                 break;
2258                         }
2259                 case TK_M_PROGRAM:
2260                         {
2261                                 char program[UTIL_PATH_SIZE];
2262                                 char **envp;
2263                                 char result[UTIL_PATH_SIZE];
2264
2265                                 free(event->program_result);
2266                                 event->program_result = NULL;
2267                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2268                                 envp = udev_device_get_properties_envp(event->dev);
2269                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2270                                      program,
2271                                      &rules->buf[rule->rule.filename_off],
2272                                      rule->rule.filename_line);
2273                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL, false) != 0) {
2274                                         if (cur->key.op != OP_NOMATCH)
2275                                                 goto nomatch;
2276                                 } else {
2277                                         int count;
2278
2279                                         util_remove_trailing_chars(result, '\n');
2280                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2281                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2282                                                 if (count > 0)
2283                                                         info(event->udev, "%i character(s) replaced\n" , count);
2284                                         }
2285                                         event->program_result = strdup(result);
2286                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2287                                         if (cur->key.op == OP_NOMATCH)
2288                                                 goto nomatch;
2289                                 }
2290                                 break;
2291                         }
2292                 case TK_M_IMPORT_FILE:
2293                         {
2294                                 char import[UTIL_PATH_SIZE];
2295
2296                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2297                                 if (import_file_into_properties(event->dev, import) != 0)
2298                                         if (cur->key.op != OP_NOMATCH)
2299                                                 goto nomatch;
2300                                 break;
2301                         }
2302                 case TK_M_IMPORT_PROG:
2303                         {
2304                                 char import[UTIL_PATH_SIZE];
2305
2306                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2307                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2308                                      import,
2309                                      &rules->buf[rule->rule.filename_off],
2310                                      rule->rule.filename_line);
2311                                 if (import_program_into_properties(event->dev, import) != 0)
2312                                         if (cur->key.op != OP_NOMATCH)
2313                                                 goto nomatch;
2314                                 break;
2315                         }
2316                 case TK_M_IMPORT_DB:
2317                         {
2318                                 const char *key = &rules->buf[cur->key.value_off];
2319                                 const char *value;
2320
2321                                 value = udev_device_get_property_value(event->dev_db, key);
2322                                 if (value != NULL) {
2323                                         struct udev_list_entry *entry;
2324
2325                                         entry = udev_device_add_property(event->dev, key, value);
2326                                         udev_list_entry_set_flags(entry, 1);
2327                                 } else {
2328                                         if (cur->key.op != OP_NOMATCH)
2329                                                 goto nomatch;
2330                                 }
2331                                 break;
2332                         }
2333                 case TK_M_IMPORT_PARENT:
2334                         {
2335                                 char import[UTIL_PATH_SIZE];
2336
2337                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2338                                 if (import_parent_into_properties(event->dev, import) != 0)
2339                                         if (cur->key.op != OP_NOMATCH)
2340                                                 goto nomatch;
2341                                 break;
2342                         }
2343                 case TK_M_RESULT:
2344                         if (match_key(rules, cur, event->program_result) != 0)
2345                                 goto nomatch;
2346                         break;
2347                 case TK_A_STRING_ESCAPE_NONE:
2348                         esc = ESCAPE_NONE;
2349                         break;
2350                 case TK_A_STRING_ESCAPE_REPLACE:
2351                         esc = ESCAPE_REPLACE;
2352                         break;
2353                 case TK_A_INOTIFY_WATCH:
2354                         event->inotify_watch = cur->key.watch;
2355                         break;
2356                 case TK_A_DEVLINK_PRIO:
2357                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2358                         break;
2359                 case TK_A_OWNER:
2360                         {
2361                                 char owner[UTIL_NAME_SIZE];
2362
2363                                 if (event->owner_final)
2364                                         break;
2365                                 if (cur->key.op == OP_ASSIGN_FINAL)
2366                                         event->owner_final = true;
2367                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2368                                 event->uid = util_lookup_user(event->udev, owner);
2369                                 info(event->udev, "OWNER %u %s:%u\n",
2370                                      event->uid,
2371                                      &rules->buf[rule->rule.filename_off],
2372                                      rule->rule.filename_line);
2373                                 break;
2374                         }
2375                 case TK_A_GROUP:
2376                         {
2377                                 char group[UTIL_NAME_SIZE];
2378
2379                                 if (event->group_final)
2380                                         break;
2381                                 if (cur->key.op == OP_ASSIGN_FINAL)
2382                                         event->group_final = true;
2383                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2384                                 event->gid = util_lookup_group(event->udev, group);
2385                                 info(event->udev, "GROUP %u %s:%u\n",
2386                                      event->gid,
2387                                      &rules->buf[rule->rule.filename_off],
2388                                      rule->rule.filename_line);
2389                                 break;
2390                         }
2391                 case TK_A_MODE:
2392                         {
2393                                 char mode[UTIL_NAME_SIZE];
2394                                 char *endptr;
2395
2396                                 if (event->mode_final)
2397                                         break;
2398                                 if (cur->key.op == OP_ASSIGN_FINAL)
2399                                         event->mode_final = true;
2400                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2401                                 event->mode = strtol(mode, &endptr, 8);
2402                                 if (endptr[0] != '\0') {
2403                                         err(event->udev, "invalide mode '%s' set default mode 0600\n", mode);
2404                                         event->mode = 0600;
2405                                 }
2406                                 info(event->udev, "MODE %#o %s:%u\n",
2407                                      event->mode,
2408                                      &rules->buf[rule->rule.filename_off],
2409                                      rule->rule.filename_line);
2410                                 break;
2411                         }
2412                 case TK_A_OWNER_ID:
2413                         if (event->owner_final)
2414                                 break;
2415                         if (cur->key.op == OP_ASSIGN_FINAL)
2416                                 event->owner_final = true;
2417                         event->uid = cur->key.uid;
2418                         info(event->udev, "OWNER %u %s:%u\n",
2419                              event->uid,
2420                              &rules->buf[rule->rule.filename_off],
2421                              rule->rule.filename_line);
2422                         break;
2423                 case TK_A_GROUP_ID:
2424                         if (event->group_final)
2425                                 break;
2426                         if (cur->key.op == OP_ASSIGN_FINAL)
2427                                 event->group_final = true;
2428                         event->gid = cur->key.gid;
2429                         info(event->udev, "GROUP %u %s:%u\n",
2430                              event->gid,
2431                              &rules->buf[rule->rule.filename_off],
2432                              rule->rule.filename_line);
2433                         break;
2434                 case TK_A_MODE_ID:
2435                         if (event->mode_final)
2436                                 break;
2437                         if (cur->key.op == OP_ASSIGN_FINAL)
2438                                 event->mode_final = true;
2439                         event->mode = cur->key.mode;
2440                         info(event->udev, "MODE %#o %s:%u\n",
2441                              event->mode,
2442                              &rules->buf[rule->rule.filename_off],
2443                              rule->rule.filename_line);
2444                         break;
2445                 case TK_A_STATIC_NODE:
2446                         break;
2447                 case TK_A_ENV:
2448                         {
2449                                 const char *name = &rules->buf[cur->key.attr_off];
2450                                 char *value = &rules->buf[cur->key.value_off];
2451
2452                                 if (value[0] != '\0') {
2453                                         char temp_value[UTIL_NAME_SIZE];
2454                                         struct udev_list_entry *entry;
2455
2456                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2457                                         entry = udev_device_add_property(event->dev, name, temp_value);
2458                                         /* store in db, skip private keys */
2459                                         if (name[0] != '.')
2460                                                 udev_list_entry_set_flags(entry, 1);
2461                                 } else {
2462                                         udev_device_add_property(event->dev, name, NULL);
2463                                 }
2464                                 break;
2465                         }
2466                 case TK_A_TAG:
2467                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2468                                 udev_device_cleanup_tags_list(event->dev);
2469                         udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
2470                         break;
2471                 case TK_A_NAME:
2472                         {
2473                                 const char *name  = &rules->buf[cur->key.value_off];
2474                                 char name_str[UTIL_PATH_SIZE];
2475                                 int count;
2476
2477                                 if (event->name_final)
2478                                         break;
2479                                 if (cur->key.op == OP_ASSIGN_FINAL)
2480                                         event->name_final = true;
2481                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2482                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2483                                         count = udev_util_replace_chars(name_str, "/");
2484                                         if (count > 0)
2485                                                 info(event->udev, "%i character(s) replaced\n", count);
2486                                 }
2487                                 free(event->name);
2488                                 event->name = strdup(name_str);
2489                                 info(event->udev, "NAME '%s' %s:%u\n",
2490                                      event->name,
2491                                      &rules->buf[rule->rule.filename_off],
2492                                      rule->rule.filename_line);
2493                                 break;
2494                         }
2495                 case TK_A_DEVLINK:
2496                         {
2497                                 char temp[UTIL_PATH_SIZE];
2498                                 char filename[UTIL_PATH_SIZE];
2499                                 char *pos, *next;
2500                                 int count = 0;
2501
2502                                 if (event->devlink_final)
2503                                         break;
2504                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2505                                         break;
2506                                 if (cur->key.op == OP_ASSIGN_FINAL)
2507                                         event->devlink_final = true;
2508                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2509                                         udev_device_cleanup_devlinks_list(event->dev);
2510
2511                                 /* allow  multiple symlinks separated by spaces */
2512                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2513                                 if (esc == ESCAPE_UNSET)
2514                                         count = udev_util_replace_chars(temp, "/ ");
2515                                 else if (esc == ESCAPE_REPLACE)
2516                                         count = udev_util_replace_chars(temp, "/");
2517                                 if (count > 0)
2518                                         info(event->udev, "%i character(s) replaced\n" , count);
2519                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2520                                 pos = temp;
2521                                 while (isspace(pos[0]))
2522                                         pos++;
2523                                 next = strchr(pos, ' ');
2524                                 while (next != NULL) {
2525                                         next[0] = '\0';
2526                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2527                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2528                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2529                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2530                                         while (isspace(next[1]))
2531                                                 next++;
2532                                         pos = &next[1];
2533                                         next = strchr(pos, ' ');
2534                                 }
2535                                 if (pos[0] != '\0') {
2536                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2537                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2538                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2539                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2540                                 }
2541                         }
2542                         break;
2543                 case TK_A_EVENT_TIMEOUT:
2544                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2545                         break;
2546                 case TK_A_ATTR:
2547                         {
2548                                 const char *key_name = &rules->buf[cur->key.attr_off];
2549                                 char attr[UTIL_PATH_SIZE];
2550                                 char value[UTIL_NAME_SIZE];
2551                                 FILE *f;
2552
2553                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2554                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2555                                 attr_subst_subdir(attr, sizeof(attr));
2556
2557                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2558                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2559                                      &rules->buf[rule->rule.filename_off],
2560                                      rule->rule.filename_line);
2561                                 f = fopen(attr, "w");
2562                                 if (f != NULL) {
2563                                         if (fprintf(f, "%s", value) <= 0)
2564                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2565                                         fclose(f);
2566                                 } else {
2567                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2568                                 }
2569                                 break;
2570                         }
2571                 case TK_A_RUN:
2572                         {
2573                                 struct udev_list_entry *list_entry;
2574
2575                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2576                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2577                                 info(event->udev, "RUN '%s' %s:%u\n",
2578                                      &rules->buf[cur->key.value_off],
2579                                      &rules->buf[rule->rule.filename_off],
2580                                      rule->rule.filename_line);
2581                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2582                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2583                                 if (cur->key.fail_on_error)
2584                                         udev_list_entry_set_flags(list_entry, 1);
2585                                 break;
2586                         }
2587                 case TK_A_GOTO:
2588                         if (cur->key.rule_goto == 0)
2589                                 break;
2590                         cur = &rules->tokens[cur->key.rule_goto];
2591                         continue;
2592                 case TK_END:
2593                         return 0;
2594
2595                 case TK_M_PARENTS_MIN:
2596                 case TK_M_PARENTS_MAX:
2597                 case TK_M_MAX:
2598                 case TK_UNSET:
2599                         err(rules->udev, "wrong type %u\n", cur->type);
2600                         goto nomatch;
2601                 }
2602
2603                 cur++;
2604                 continue;
2605         nomatch:
2606                 /* fast-forward to next rule */
2607                 cur = rule + rule->rule.token_count;
2608                 dbg(rules->udev, "forward to rule: %u\n",
2609                                  (unsigned int) (cur - rules->tokens));
2610         }
2611 }
2612
2613 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2614 {
2615         struct token *cur;
2616         struct token *rule;
2617         uid_t uid = 0;
2618         gid_t gid = 0;
2619         mode_t mode = 0;
2620
2621         if (rules->tokens == NULL)
2622                 return;
2623
2624         cur = &rules->tokens[0];
2625         rule = cur;
2626         for (;;) {
2627                 switch (cur->type) {
2628                 case TK_RULE:
2629                         /* current rule */
2630                         rule = cur;
2631
2632                         /* skip rules without a static_node tag */
2633                         if (!rule->rule.has_static_node)
2634                                 goto next;
2635
2636                         uid = 0;
2637                         gid = 0;
2638                         mode = 0;
2639                         break;
2640                 case TK_A_OWNER_ID:
2641                         uid = cur->key.uid;
2642                         break;
2643                 case TK_A_GROUP_ID:
2644                         gid = cur->key.gid;
2645                         break;
2646                 case TK_A_MODE_ID:
2647                         mode = cur->key.mode;
2648                         break;
2649                 case TK_A_STATIC_NODE: {
2650                         char filename[UTIL_PATH_SIZE];
2651                         struct stat stats;
2652                         /* we assure, that the permissions tokens are sorted before the static token */
2653                         if (mode == 0 && uid == 0 && gid == 0)
2654                                 goto next;
2655                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2656                                       &rules->buf[cur->key.value_off], NULL);
2657                         if (stat(filename, &stats) != 0)
2658                                 goto next;
2659                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2660                                 goto next;
2661                         if (mode != 0 && mode != (stats.st_mode & 0777)) {
2662                                 chmod(filename, mode);
2663                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2664                         }
2665                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2666                                 chown(filename, uid, gid);
2667                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2668                         }
2669                         utimensat(AT_FDCWD, filename, NULL, 0);
2670                         break;
2671                 }
2672                 case TK_END:
2673                         return;
2674                 }
2675
2676                 cur++;
2677                 continue;
2678 next:
2679                 /* fast-forward to next rule */
2680                 cur = rule + rule->rule.token_count;
2681                 continue;
2682         }
2683 }