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 #define SMK_MAXLEN                      23
  40
  41 struct uid_gid {
  42         unsigned int name_off;
  43         union {
  44                 uid_t   uid;
  45                 gid_t   gid;
  46         };
  47 };
  48
  49 struct trie_node {
  50         /* this node's first child */
  51         unsigned int child_idx;
  52         /* the next child of our parent node's child list */
  53         unsigned int next_child_idx;
  54         /* this node's last child (shortcut for append) */
  55         unsigned int last_child_idx;
  56         unsigned int value_off;
  57         unsigned short value_len;
  58         unsigned char key;
  59 };
  60
  61 struct udev_rules {
  62         struct udev *udev;
  63         int resolve_names;
  64
  65         /* every key in the rules file becomes a token */
  66         struct token *tokens;
  67         unsigned int token_cur;
  68         unsigned int token_max;
  69
  70         /* all key strings are copied to a single string buffer */
  71         char *buf;
  72         size_t buf_cur;
  73         size_t buf_max;
  74         unsigned int buf_count;
  75
  76         /* during rule parsing, strings are indexed to find duplicates */
  77         struct trie_node *trie_nodes;
  78         unsigned int trie_nodes_cur;
  79         unsigned int trie_nodes_max;
  80
  81         /* during rule parsing, uid/gid lookup results are cached */
  82         struct uid_gid *uids;
  83         unsigned int uids_cur;
  84         unsigned int uids_max;
  85         struct uid_gid *gids;
  86         unsigned int gids_cur;
  87         unsigned int gids_max;
  88 };
  89
  90 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  91 enum operation_type {
  92         OP_UNSET,
  93
  94         OP_MATCH,
  95         OP_NOMATCH,
  96         OP_MATCH_MAX,
  97
  98         OP_ADD,
  99         OP_ASSIGN,
 100         OP_ASSIGN_FINAL,
 101 };
 102
 103 enum string_glob_type {
 104         GL_UNSET,
 105         GL_PLAIN,                       /* no special chars */
 106         GL_GLOB,                        /* shell globs ?,*,[] */
 107         GL_SPLIT,                       /* multi-value A|B */
 108         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 109         GL_SOMETHING,                   /* commonly used "?*" */
 110 };
 111
 112 enum string_subst_type {
 113         SB_UNSET,
 114         SB_NONE,
 115         SB_FORMAT,
 116         SB_SUBSYS,
 117 };
 118
 119 /* tokens of a rule are sorted/handled in this order */
 120 enum token_type {
 121         TK_UNSET,
 122         TK_RULE,
 123
 124         TK_M_ACTION,                    /* val */
 125         TK_M_DEVPATH,                   /* val */
 126         TK_M_KERNEL,                    /* val */
 127         TK_M_DEVLINK,                   /* val */
 128         TK_M_NAME,                      /* val */
 129         TK_M_ENV,                       /* val, attr */
 130         TK_M_TAG,                       /* val */
 131         TK_M_SUBSYSTEM,                 /* val */
 132         TK_M_DRIVER,                    /* val */
 133         TK_M_WAITFOR,                   /* val */
 134         TK_M_ATTR,                      /* val, attr */
 135
 136         TK_M_PARENTS_MIN,
 137         TK_M_KERNELS,                   /* val */
 138         TK_M_SUBSYSTEMS,                /* val */
 139         TK_M_DRIVERS,                   /* val */
 140         TK_M_ATTRS,                     /* val, attr */
 141         TK_M_PARENTS_MAX,
 142
 143         TK_M_TEST,                      /* val, mode_t */
 144         TK_M_PROGRAM,                   /* val */
 145         TK_M_IMPORT_FILE,               /* val */
 146         TK_M_IMPORT_PROG,               /* val */
 147         TK_M_IMPORT_DB,                 /* val */
 148         TK_M_IMPORT_CMDLINE,            /* val */
 149         TK_M_IMPORT_PARENT,             /* val */
 150         TK_M_RESULT,                    /* val */
 151         TK_M_MAX,
 152
 153         TK_A_STRING_ESCAPE_NONE,
 154         TK_A_STRING_ESCAPE_REPLACE,
 155         TK_A_INOTIFY_WATCH,             /* int */
 156         TK_A_DEVLINK_PRIO,              /* int */
 157         TK_A_OWNER,                     /* val */
 158         TK_A_GROUP,                     /* val */
 159         TK_A_MODE,                      /* val */
 160         TK_A_OWNER_ID,                  /* uid_t */
 161         TK_A_GROUP_ID,                  /* gid_t */
 162         TK_A_MODE_ID,                   /* mode_t */
 163         TK_A_STATIC_NODE,               /* val */
 164         TK_A_ENV,                       /* val, attr */
 165         TK_A_TAG,                       /* val */
 166         TK_A_NAME,                      /* val */
 167         TK_A_DEVLINK,                   /* val */
 168         TK_A_EVENT_TIMEOUT,             /* int */
 169         TK_A_ATTR,                      /* val, attr */
 170         TK_A_RUN,                       /* val, bool */
 171         TK_A_GOTO,                      /* size_t */
 172         TK_A_SMACK,                     /* val */
 173
 174         TK_END,
 175 };
 176
 177 /* we try to pack stuff in a way that we take only 12 bytes per token */
 178 struct token {
 179         union {
 180                 unsigned char type;             /* same in rule and key */
 181                 struct {
 182                         enum token_type type:8;
 183                         bool can_set_name:1;
 184                         bool has_static_node:1;
 185                         unsigned int unused:6;
 186                         unsigned short token_count;
 187                         unsigned int label_off;
 188                         unsigned short filename_off;
 189                         unsigned short filename_line;
 190                 } rule;
 191                 struct {
 192                         enum token_type type:8;
 193                         enum operation_type op:8;
 194                         enum string_glob_type glob:8;
 195                         enum string_subst_type subst:4;
 196                         enum string_subst_type attrsubst:4;
 197                         unsigned int value_off;
 198                         union {
 199                                 unsigned int attr_off;
 200                                 int devlink_unique;
 201                                 int fail_on_error;
 202                                 unsigned int rule_goto;
 203                                 mode_t  mode;
 204                                 uid_t uid;
 205                                 gid_t gid;
 206                                 int devlink_prio;
 207                                 int event_timeout;
 208                                 int watch;
 209                         };
 210                 } key;
 211         };
 212 };
 213
 214 #define MAX_TK          64
 215 struct rule_tmp {
 216         struct udev_rules *rules;
 217         struct token rule;
 218         struct token token[MAX_TK];
 219         unsigned int token_cur;
 220 };
 221
 222 #ifdef ENABLE_DEBUG
 223 static const char *operation_str(enum operation_type type)
 224 {
 225         static const char *operation_strs[] = {
 226                 [OP_UNSET] =            "UNSET",
 227                 [OP_MATCH] =            "match",
 228                 [OP_NOMATCH] =          "nomatch",
 229                 [OP_MATCH_MAX] =        "MATCH_MAX",
 230
 231                 [OP_ADD] =              "add",
 232                 [OP_ASSIGN] =           "assign",
 233                 [OP_ASSIGN_FINAL] =     "assign-final",
 234 }       ;
 235
 236         return operation_strs[type];
 237 }
 238
 239 static const char *string_glob_str(enum string_glob_type type)
 240 {
 241         static const char *string_glob_strs[] = {
 242                 [GL_UNSET] =            "UNSET",
 243                 [GL_PLAIN] =            "plain",
 244                 [GL_GLOB] =             "glob",
 245                 [GL_SPLIT] =            "split",
 246                 [GL_SPLIT_GLOB] =       "split-glob",
 247                 [GL_SOMETHING] =        "split-glob",
 248         };
 249
 250         return string_glob_strs[type];
 251 }
 252
 253 static const char *token_str(enum token_type type)
 254 {
 255         static const char *token_strs[] = {
 256                 [TK_UNSET] =                    "UNSET",
 257                 [TK_RULE] =                     "RULE",
 258
 259                 [TK_M_ACTION] =                 "M ACTION",
 260                 [TK_M_DEVPATH] =                "M DEVPATH",
 261                 [TK_M_KERNEL] =                 "M KERNEL",
 262                 [TK_M_DEVLINK] =                "M DEVLINK",
 263                 [TK_M_NAME] =                   "M NAME",
 264                 [TK_M_ENV] =                    "M ENV",
 265                 [TK_M_TAG] =                    "M TAG",
 266                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 267                 [TK_M_DRIVER] =                 "M DRIVER",
 268                 [TK_M_WAITFOR] =                "M WAITFOR",
 269                 [TK_M_ATTR] =                   "M ATTR",
 270
 271                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 272                 [TK_M_KERNELS] =                "M KERNELS",
 273                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 274                 [TK_M_DRIVERS] =                "M DRIVERS",
 275                 [TK_M_ATTRS] =                  "M ATTRS",
 276                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 277
 278                 [TK_M_TEST] =                   "M TEST",
 279                 [TK_M_PROGRAM] =                "M PROGRAM",
 280                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 281                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 282                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 283                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 284                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 285                 [TK_M_RESULT] =                 "M RESULT",
 286                 [TK_M_MAX] =                    "M MAX",
 287
 288                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 289                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 290                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 291                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 292                 [TK_A_OWNER] =                  "A OWNER",
 293                 [TK_A_GROUP] =                  "A GROUP",
 294                 [TK_A_MODE] =                   "A MODE",
 295                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 296                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 297                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 298                 [TK_A_MODE_ID] =                "A MODE_ID",
 299                 [TK_A_ENV] =                    "A ENV",
 300                 [TK_A_TAG] =                    "A ENV",
 301                 [TK_A_NAME] =                   "A NAME",
 302                 [TK_A_DEVLINK] =                "A DEVLINK",
 303                 [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 304                 [TK_A_ATTR] =                   "A ATTR",
 305                 [TK_A_RUN] =                    "A RUN",
 306                 [TK_A_GOTO] =                   "A GOTO",
 307
 308                 [TK_END] =                      "END",
 309         };
 310
 311         return token_strs[type];
 312 }
 313
 314 static void dump_token(struct udev_rules *rules, struct token *token)
 315 {
 316         enum token_type type = token->type;
 317         enum operation_type op = token->key.op;
 318         enum string_glob_type glob = token->key.glob;
 319         const char *value = &rules->buf[token->key.value_off];
 320         const char *attr = &rules->buf[token->key.attr_off];
 321
 322         switch (type) {
 323         case TK_RULE:
 324                 {
 325                         const char *tks_ptr = (char *)rules->tokens;
 326                         const char *tk_ptr = (char *)token;
 327                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 328
 329                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 330                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 331                             idx, token->rule.token_count,
 332                             &rules->buf[token->rule.label_off]);
 333                         break;
 334                 }
 335         case TK_M_ACTION:
 336         case TK_M_DEVPATH:
 337         case TK_M_KERNEL:
 338         case TK_M_SUBSYSTEM:
 339         case TK_M_DRIVER:
 340         case TK_M_WAITFOR:
 341         case TK_M_DEVLINK:
 342         case TK_M_NAME:
 343         case TK_M_KERNELS:
 344         case TK_M_SUBSYSTEMS:
 345         case TK_M_DRIVERS:
 346         case TK_M_PROGRAM:
 347         case TK_M_IMPORT_FILE:
 348         case TK_M_IMPORT_PROG:
 349         case TK_M_IMPORT_DB:
 350         case TK_M_IMPORT_CMDLINE:
 351         case TK_M_IMPORT_PARENT:
 352         case TK_M_RESULT:
 353         case TK_A_NAME:
 354         case TK_A_DEVLINK:
 355         case TK_A_OWNER:
 356         case TK_A_GROUP:
 357         case TK_A_MODE:
 358         case TK_A_RUN:
 359                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 360                     token_str(type), operation_str(op), value, string_glob_str(glob));
 361                 break;
 362         case TK_M_ATTR:
 363         case TK_M_ATTRS:
 364         case TK_M_ENV:
 365         case TK_A_ATTR:
 366         case TK_A_ENV:
 367                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 368                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 369                 break;
 370         case TK_M_TAG:
 371         case TK_A_TAG:
 372                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 373                 break;
 374         case TK_A_STRING_ESCAPE_NONE:
 375         case TK_A_STRING_ESCAPE_REPLACE:
 376                 dbg(rules->udev, "%s\n", token_str(type));
 377                 break;
 378         case TK_M_TEST:
 379                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 380                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 381                 break;
 382         case TK_A_INOTIFY_WATCH:
 383                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 384                 break;
 385         case TK_A_DEVLINK_PRIO:
 386                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 387                 break;
 388         case TK_A_OWNER_ID:
 389                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 390                 break;
 391         case TK_A_GROUP_ID:
 392                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 393                 break;
 394         case TK_A_MODE_ID:
 395                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 396                 break;
 397         case TK_A_STATIC_NODE:
 398                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 399                 break;
 400         case TK_A_EVENT_TIMEOUT:
 401                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 402                 break;
 403         case TK_A_GOTO:
 404                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 405                 break;
 406         case TK_END:
 407                 dbg(rules->udev, "* %s\n", token_str(type));
 408                 break;
 409         case TK_M_PARENTS_MIN:
 410         case TK_M_PARENTS_MAX:
 411         case TK_M_MAX:
 412         case TK_UNSET:
 413                 dbg(rules->udev, "unknown type %u\n", type);
 414                 break;
 415         }
 416 }
 417
 418 static void dump_rules(struct udev_rules *rules)
 419 {
 420         unsigned int i;
 421
 422         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 423             rules->token_cur,
 424             rules->token_cur * sizeof(struct token),
 425             rules->buf_count,
 426             rules->buf_cur);
 427         for(i = 0; i < rules->token_cur; i++)
 428                 dump_token(rules, &rules->tokens[i]);
 429 }
 430 #else
 431 static inline const char *operation_str(enum operation_type type) { return NULL; }
 432 static inline const char *token_str(enum token_type type) { return NULL; }
 433 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 434 static inline void dump_rules(struct udev_rules *rules) {}
 435 #endif /* ENABLE_DEBUG */
 436
 437 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 438 {
 439         int off;
 440
 441         /* grow buffer if needed */
 442         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 443                 char *buf;
 444                 unsigned int add;
 445
 446                 /* double the buffer size */
 447                 add = rules->buf_max;
 448                 if (add < bytes * 8)
 449                         add = bytes * 8;
 450
 451                 buf = realloc(rules->buf, rules->buf_max + add);
 452                 if (buf == NULL)
 453                         return -1;
 454                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 455                 rules->buf = buf;
 456                 rules->buf_max += add;
 457         }
 458         off = rules->buf_cur;
 459         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 460         rules->buf_cur += bytes;
 461         rules->buf_count++;
 462         return off;
 463 }
 464
 465 static int add_string(struct udev_rules *rules, const char *str)
 466 {
 467         unsigned int node_idx;
 468         struct trie_node *new_node;
 469         unsigned int new_node_idx;
 470         unsigned char key;
 471         unsigned short len;
 472         unsigned int depth;
 473         unsigned int off;
 474         struct trie_node *parent;
 475
 476         /* walk trie, start from last character of str to find matching tails */
 477         len = strlen(str);
 478         key = str[len-1];
 479         node_idx = 0;
 480         for (depth = 0; depth <= len; depth++) {
 481                 struct trie_node *node;
 482                 unsigned int child_idx;
 483
 484                 node = &rules->trie_nodes[node_idx];
 485                 off = node->value_off + node->value_len - len;
 486
 487                 /* match against current node */
 488                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 489                         return off;
 490
 491                 /* lookup child node */
 492                 key = str[len - 1 - depth];
 493                 child_idx = node->child_idx;
 494                 while (child_idx > 0) {
 495                         struct trie_node *child;
 496
 497                         child = &rules->trie_nodes[child_idx];
 498                         if (child->key == key)
 499                                 break;
 500                         child_idx = child->next_child_idx;
 501                 }
 502                 if (child_idx == 0)
 503                         break;
 504                 node_idx = child_idx;
 505         }
 506
 507         /* string not found, add it */
 508         off = add_new_string(rules, str, len + 1);
 509
 510         /* grow trie nodes if needed */
 511         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 512                 struct trie_node *nodes;
 513                 unsigned int add;
 514
 515                 /* double the buffer size */
 516                 add = rules->trie_nodes_max;
 517                 if (add < 8)
 518                         add = 8;
 519
 520                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 521                 if (nodes == NULL)
 522                         return -1;
 523                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 524                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 525                 rules->trie_nodes = nodes;
 526                 rules->trie_nodes_max += add;
 527         }
 528
 529         /* get a new node */
 530         new_node_idx = rules->trie_nodes_cur;
 531         rules->trie_nodes_cur++;
 532         new_node = &rules->trie_nodes[new_node_idx];
 533         memset(new_node, 0x00, sizeof(struct trie_node));
 534         new_node->value_off = off;
 535         new_node->value_len = len;
 536         new_node->key = key;
 537
 538         /* join the parent's child list */
 539         parent = &rules->trie_nodes[node_idx];
 540         if (parent->child_idx == 0) {
 541                 parent->child_idx = new_node_idx;
 542         } else {
 543                 struct trie_node *last_child;
 544
 545                 last_child = &rules->trie_nodes[parent->last_child_idx];
 546                 last_child->next_child_idx = new_node_idx;
 547         }
 548         parent->last_child_idx = new_node_idx;
 549         return off;
 550 }
 551
 552 static int add_token(struct udev_rules *rules, struct token *token)
 553 {
 554         /* grow buffer if needed */
 555         if (rules->token_cur+1 >= rules->token_max) {
 556                 struct token *tokens;
 557                 unsigned int add;
 558
 559                 /* double the buffer size */
 560                 add = rules->token_max;
 561                 if (add < 8)
 562                         add = 8;
 563
 564                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 565                 if (tokens == NULL)
 566                         return -1;
 567                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 568                 rules->tokens = tokens;
 569                 rules->token_max += add;
 570         }
 571         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 572         rules->token_cur++;
 573         return 0;
 574 }
 575
 576 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 577 {
 578         unsigned int i;
 579         uid_t uid;
 580         unsigned int off;
 581
 582         /* lookup, if we know it already */
 583         for (i = 0; i < rules->uids_cur; i++) {
 584                 off = rules->uids[i].name_off;
 585                 if (strcmp(&rules->buf[off], owner) == 0) {
 586                         uid = rules->uids[i].uid;
 587                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 588                         return uid;
 589                 }
 590         }
 591         uid = util_lookup_user(rules->udev, owner);
 592
 593         /* grow buffer if needed */
 594         if (rules->uids_cur+1 >= rules->uids_max) {
 595                 struct uid_gid *uids;
 596                 unsigned int add;
 597
 598                 /* double the buffer size */
 599                 add = rules->uids_max;
 600                 if (add < 1)
 601                         add = 8;
 602
 603                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 604                 if (uids == NULL)
 605                         return uid;
 606                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 607                 rules->uids = uids;
 608                 rules->uids_max += add;
 609         }
 610         rules->uids[rules->uids_cur].uid = uid;
 611         off = add_string(rules, owner);
 612         if (off <= 0)
 613                 return uid;
 614         rules->uids[rules->uids_cur].name_off = off;
 615         rules->uids_cur++;
 616         return uid;
 617 }
 618
 619 static gid_t add_gid(struct udev_rules *rules, const char *group)
 620 {
 621         unsigned int i;
 622         gid_t gid;
 623         unsigned int off;
 624
 625         /* lookup, if we know it already */
 626         for (i = 0; i < rules->gids_cur; i++) {
 627                 off = rules->gids[i].name_off;
 628                 if (strcmp(&rules->buf[off], group) == 0) {
 629                         gid = rules->gids[i].gid;
 630                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 631                         return gid;
 632                 }
 633         }
 634         gid = util_lookup_group(rules->udev, group);
 635
 636         /* grow buffer if needed */
 637         if (rules->gids_cur+1 >= rules->gids_max) {
 638                 struct uid_gid *gids;
 639                 unsigned int add;
 640
 641                 /* double the buffer size */
 642                 add = rules->gids_max;
 643                 if (add < 1)
 644                         add = 8;
 645
 646                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 647                 if (gids == NULL)
 648                         return gid;
 649                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 650                 rules->gids = gids;
 651                 rules->gids_max += add;
 652         }
 653         rules->gids[rules->gids_cur].gid = gid;
 654         off = add_string(rules, group);
 655         if (off <= 0)
 656                 return gid;
 657         rules->gids[rules->gids_cur].name_off = off;
 658         rules->gids_cur++;
 659         return gid;
 660 }
 661
 662 static int import_property_from_string(struct udev_device *dev, char *line)
 663 {
 664         struct udev *udev = udev_device_get_udev(dev);
 665         char *key;
 666         char *val;
 667         size_t len;
 668
 669         /* find key */
 670         key = line;
 671         while (isspace(key[0]))
 672                 key++;
 673
 674         /* comment or empty line */
 675         if (key[0] == '#' || key[0] == '\0')
 676                 return -1;
 677
 678         /* split key/value */
 679         val = strchr(key, '=');
 680         if (val == NULL)
 681                 return -1;
 682         val[0] = '\0';
 683         val++;
 684
 685         /* find value */
 686         while (isspace(val[0]))
 687                 val++;
 688
 689         /* terminate key */
 690         len = strlen(key);
 691         if (len == 0)
 692                 return -1;
 693         while (isspace(key[len-1]))
 694                 len--;
 695         key[len] = '\0';
 696
 697         /* terminate value */
 698         len = strlen(val);
 699         if (len == 0)
 700                 return -1;
 701         while (isspace(val[len-1]))
 702                 len--;
 703         val[len] = '\0';
 704
 705         if (len == 0)
 706                 return -1;
 707
 708         /* unquote */
 709         if (val[0] == '"' || val[0] == '\'') {
 710                 if (val[len-1] != val[0]) {
 711                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 712                         return -1;
 713                 }
 714                 val[len-1] = '\0';
 715                 val++;
 716         }
 717
 718         dbg(udev, "adding '%s'='%s'\n", key, val);
 719
 720         /* handle device, renamed by external tool, returning new path */
 721         if (strcmp(key, "DEVPATH") == 0) {
 722                 char syspath[UTIL_PATH_SIZE];
 723
 724                 info(udev, "updating devpath from '%s' to '%s'\n",
 725                      udev_device_get_devpath(dev), val);
 726                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 727                 udev_device_set_syspath(dev, syspath);
 728         } else {
 729                 struct udev_list_entry *entry;
 730
 731                 entry = udev_device_add_property(dev, key, val);
 732                 /* store in db, skip private keys */
 733                 if (key[0] != '.')
 734                         udev_list_entry_set_flags(entry, 1);
 735         }
 736         return 0;
 737 }
 738
 739 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 740 {
 741         FILE *f;
 742         char line[UTIL_LINE_SIZE];
 743
 744         f = fopen(filename, "r");
 745         if (f == NULL)
 746                 return -1;
 747         while (fgets(line, sizeof(line), f) != NULL)
 748                 import_property_from_string(dev, line);
 749         fclose(f);
 750         return 0;
 751 }
 752
 753 static int import_program_into_properties(struct udev_device *dev, const char *program)
 754 {
 755         struct udev *udev = udev_device_get_udev(dev);
 756         char **envp;
 757         char result[UTIL_LINE_SIZE];
 758         size_t reslen;
 759         char *line;
 760
 761         envp = udev_device_get_properties_envp(dev);
 762         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL, false) != 0)
 763                 return -1;
 764
 765         line = result;
 766         while (line != NULL) {
 767                 char *pos;
 768
 769                 pos = strchr(line, '\n');
 770                 if (pos != NULL) {
 771                         pos[0] = '\0';
 772                         pos = &pos[1];
 773                 }
 774                 import_property_from_string(dev, line);
 775                 line = pos;
 776         }
 777         return 0;
 778 }
 779
 780 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 781 {
 782         struct udev *udev = udev_device_get_udev(dev);
 783         struct udev_device *dev_parent;
 784         struct udev_list_entry *list_entry;
 785
 786         dev_parent = udev_device_get_parent(dev);
 787         if (dev_parent == NULL)
 788                 return -1;
 789
 790         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 791         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 792                 const char *key = udev_list_entry_get_name(list_entry);
 793                 const char *val = udev_list_entry_get_value(list_entry);
 794
 795                 if (fnmatch(filter, key, 0) == 0) {
 796                         struct udev_list_entry *entry;
 797
 798                         dbg(udev, "import key '%s=%s'\n", key, val);
 799                         entry = udev_device_add_property(dev, key, val);
 800                         /* store in db, skip private keys */
 801                         if (key[0] != '.')
 802                                 udev_list_entry_set_flags(entry, 1);
 803                 }
 804         }
 805         return 0;
 806 }
 807
 808 #define WAIT_LOOP_PER_SECOND            50
 809 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 810 {
 811         struct udev *udev = udev_device_get_udev(dev);
 812         char filepath[UTIL_PATH_SIZE];
 813         char devicepath[UTIL_PATH_SIZE];
 814         struct stat stats;
 815         int loop = timeout * WAIT_LOOP_PER_SECOND;
 816
 817         /* a relative path is a device attribute */
 818         devicepath[0] = '\0';
 819         if (file[0] != '/') {
 820                 util_strscpyl(devicepath, sizeof(devicepath),
 821                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 822                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 823                 file = filepath;
 824         }
 825
 826         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 827         while (--loop) {
 828                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 829
 830                 /* lookup file */
 831                 if (stat(file, &stats) == 0) {
 832                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 833                         return 0;
 834                 }
 835                 /* make sure, the device did not disappear in the meantime */
 836                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 837                         info(udev, "device disappeared while waiting for '%s'\n", file);
 838                         return -2;
 839                 }
 840                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 841                 nanosleep(&duration, NULL);
 842         }
 843         info(udev, "waiting for '%s' failed\n", file);
 844         return -1;
 845 }
 846
 847 static int attr_subst_subdir(char *attr, size_t len)
 848 {
 849         bool found = false;
 850
 851         if (strstr(attr, "/*/")) {
 852                 char *pos;
 853                 char dirname[UTIL_PATH_SIZE];
 854                 const char *tail;
 855                 DIR *dir;
 856
 857                 util_strscpy(dirname, sizeof(dirname), attr);
 858                 pos = strstr(dirname, "/*/");
 859                 if (pos == NULL)
 860                         return -1;
 861                 pos[0] = '\0';
 862                 tail = &pos[2];
 863                 dir = opendir(dirname);
 864                 if (dir != NULL) {
 865                         struct dirent *dent;
 866
 867                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 868                                 struct stat stats;
 869
 870                                 if (dent->d_name[0] == '.')
 871                                         continue;
 872                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 873                                 if (stat(attr, &stats) == 0) {
 874                                         found = true;
 875                                         break;
 876                                 }
 877                         }
 878                         closedir(dir);
 879                 }
 880         }
 881
 882         return found;
 883 }
 884
 885 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 886 {
 887         char *linepos;
 888         char *temp;
 889
 890         linepos = *line;
 891         if (linepos == NULL || linepos[0] == '\0')
 892                 return -1;
 893
 894         /* skip whitespace */
 895         while (isspace(linepos[0]) || linepos[0] == ',')
 896                 linepos++;
 897
 898         /* get the key */
 899         if (linepos[0] == '\0')
 900                 return -1;
 901         *key = linepos;
 902
 903         for (;;) {
 904                 linepos++;
 905                 if (linepos[0] == '\0')
 906                         return -1;
 907                 if (isspace(linepos[0]))
 908                         break;
 909                 if (linepos[0] == '=')
 910                         break;
 911                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 912                         if (linepos[1] == '=')
 913                                 break;
 914         }
 915
 916         /* remember end of key */
 917         temp = linepos;
 918
 919         /* skip whitespace after key */
 920         while (isspace(linepos[0]))
 921                 linepos++;
 922         if (linepos[0] == '\0')
 923                 return -1;
 924
 925         /* get operation type */
 926         if (linepos[0] == '=' && linepos[1] == '=') {
 927                 *op = OP_MATCH;
 928                 linepos += 2;
 929         } else if (linepos[0] == '!' && linepos[1] == '=') {
 930                 *op = OP_NOMATCH;
 931                 linepos += 2;
 932         } else if (linepos[0] == '+' && linepos[1] == '=') {
 933                 *op = OP_ADD;
 934                 linepos += 2;
 935         } else if (linepos[0] == '=') {
 936                 *op = OP_ASSIGN;
 937                 linepos++;
 938         } else if (linepos[0] == ':' && linepos[1] == '=') {
 939                 *op = OP_ASSIGN_FINAL;
 940                 linepos += 2;
 941         } else
 942                 return -1;
 943
 944         /* terminate key */
 945         temp[0] = '\0';
 946
 947         /* skip whitespace after operator */
 948         while (isspace(linepos[0]))
 949                 linepos++;
 950         if (linepos[0] == '\0')
 951                 return -1;
 952
 953         /* get the value */
 954         if (linepos[0] == '"')
 955                 linepos++;
 956         else
 957                 return -1;
 958         *value = linepos;
 959
 960         /* terminate */
 961         temp = strchr(linepos, '"');
 962         if (!temp)
 963                 return -1;
 964         temp[0] = '\0';
 965         temp++;
 966         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 967
 968         /* move line to next key */
 969         *line = temp;
 970         return 0;
 971 }
 972
 973 /* extract possible KEY{attr} */
 974 static char *get_key_attribute(struct udev *udev, char *str)
 975 {
 976         char *pos;
 977         char *attr;
 978
 979         attr = strchr(str, '{');
 980         if (attr != NULL) {
 981                 attr++;
 982                 pos = strchr(attr, '}');
 983                 if (pos == NULL) {
 984                         err(udev, "missing closing brace for format\n");
 985                         return NULL;
 986                 }
 987                 pos[0] = '\0';
 988                 dbg(udev, "attribute='%s'\n", attr);
 989                 return attr;
 990         }
 991         return NULL;
 992 }
 993
 994 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 995                         enum operation_type op,
 996                         const char *value, const void *data)
 997 {
 998         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 999         const char *attr = NULL;
1000
1001         memset(token, 0x00, sizeof(struct token));
1002
1003         switch (type) {
1004         case TK_M_ACTION:
1005         case TK_M_DEVPATH:
1006         case TK_M_KERNEL:
1007         case TK_M_SUBSYSTEM:
1008         case TK_M_DRIVER:
1009         case TK_M_WAITFOR:
1010         case TK_M_DEVLINK:
1011         case TK_M_NAME:
1012         case TK_M_KERNELS:
1013         case TK_M_SUBSYSTEMS:
1014         case TK_M_DRIVERS:
1015         case TK_M_PROGRAM:
1016         case TK_M_IMPORT_FILE:
1017         case TK_M_IMPORT_PROG:
1018         case TK_M_IMPORT_DB:
1019         case TK_M_IMPORT_CMDLINE:
1020         case TK_M_IMPORT_PARENT:
1021         case TK_M_RESULT:
1022         case TK_A_OWNER:
1023         case TK_A_GROUP:
1024         case TK_A_MODE:
1025         case TK_A_NAME:
1026         case TK_A_GOTO:
1027         case TK_M_TAG:
1028         case TK_A_TAG:
1029         case TK_A_SMACK:
1030                 token->key.value_off = add_string(rule_tmp->rules, value);
1031                 break;
1032         case TK_M_ENV:
1033         case TK_M_ATTR:
1034         case TK_M_ATTRS:
1035         case TK_A_ATTR:
1036         case TK_A_ENV:
1037                 attr = data;
1038                 token->key.value_off = add_string(rule_tmp->rules, value);
1039                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1040                 break;
1041         case TK_A_DEVLINK:
1042                 token->key.value_off = add_string(rule_tmp->rules, value);
1043                 token->key.devlink_unique = *(int *)data;
1044                 break;
1045         case TK_M_TEST:
1046                 token->key.value_off = add_string(rule_tmp->rules, value);
1047                 if (data != NULL)
1048                         token->key.mode = *(mode_t *)data;
1049                 break;
1050         case TK_A_STRING_ESCAPE_NONE:
1051         case TK_A_STRING_ESCAPE_REPLACE:
1052                 break;
1053         case TK_A_RUN:
1054                 token->key.value_off = add_string(rule_tmp->rules, value);
1055                 token->key.fail_on_error = *(int *)data;
1056                 break;
1057         case TK_A_INOTIFY_WATCH:
1058         case TK_A_DEVLINK_PRIO:
1059                 token->key.devlink_prio = *(int *)data;
1060                 break;
1061         case TK_A_OWNER_ID:
1062                 token->key.uid = *(uid_t *)data;
1063                 break;
1064         case TK_A_GROUP_ID:
1065                 token->key.gid = *(gid_t *)data;
1066                 break;
1067         case TK_A_MODE_ID:
1068                 token->key.mode = *(mode_t *)data;
1069                 break;
1070         case TK_A_STATIC_NODE:
1071                 token->key.value_off = add_string(rule_tmp->rules, value);
1072                 break;
1073         case TK_A_EVENT_TIMEOUT:
1074                 token->key.event_timeout = *(int *)data;
1075                 break;
1076         case TK_RULE:
1077         case TK_M_PARENTS_MIN:
1078         case TK_M_PARENTS_MAX:
1079         case TK_M_MAX:
1080         case TK_END:
1081         case TK_UNSET:
1082                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1083                 return -1;
1084         }
1085
1086         if (value != NULL && type < TK_M_MAX) {
1087                 /* check if we need to split or call fnmatch() while matching rules */
1088                 enum string_glob_type glob;
1089                 int has_split;
1090                 int has_glob;
1091
1092                 has_split = (strchr(value, '|') != NULL);
1093                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1094                 if (has_split && has_glob) {
1095                         glob = GL_SPLIT_GLOB;
1096                 } else if (has_split) {
1097                         glob = GL_SPLIT;
1098                 } else if (has_glob) {
1099                         if (strcmp(value, "?*") == 0)
1100                                 glob = GL_SOMETHING;
1101                         else
1102                                 glob = GL_GLOB;
1103                 } else {
1104                         glob = GL_PLAIN;
1105                 }
1106                 token->key.glob = glob;
1107         }
1108
1109         if (value != NULL && type > TK_M_MAX) {
1110                 /* check if assigned value has substitution chars */
1111                 if (value[0] == '[')
1112                         token->key.subst = SB_SUBSYS;
1113                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1114                         token->key.subst = SB_FORMAT;
1115                 else
1116                         token->key.subst = SB_NONE;
1117         }
1118
1119         if (attr != NULL) {
1120                 /* check if property/attribut name has substitution chars */
1121                 if (attr[0] == '[')
1122                         token->key.attrsubst = SB_SUBSYS;
1123                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1124                         token->key.attrsubst = SB_FORMAT;
1125                 else
1126                         token->key.attrsubst = SB_NONE;
1127         }
1128
1129         token->key.type = type;
1130         token->key.op = op;
1131         rule_tmp->token_cur++;
1132         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1133                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1134                 return -1;
1135         }
1136         return 0;
1137 }
1138
1139 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1140 {
1141         unsigned int i;
1142         unsigned int start = 0;
1143         unsigned int end = rule_tmp->token_cur;
1144
1145         for (i = 0; i < rule_tmp->token_cur; i++) {
1146                 enum token_type next_val = TK_UNSET;
1147                 unsigned int next_idx = 0;
1148                 unsigned int j;
1149
1150                 /* find smallest value */
1151                 for (j = start; j < end; j++) {
1152                         if (rule_tmp->token[j].type == TK_UNSET)
1153                                 continue;
1154                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1155                                 next_val = rule_tmp->token[j].type;
1156                                 next_idx = j;
1157                         }
1158                 }
1159
1160                 /* add token and mark done */
1161                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1162                         return -1;
1163                 rule_tmp->token[next_idx].type = TK_UNSET;
1164
1165                 /* shrink range */
1166                 if (next_idx == start)
1167                         start++;
1168                 if (next_idx+1 == end)
1169                         end--;
1170         }
1171         return 0;
1172 }
1173
1174 static int add_rule(struct udev_rules *rules, char *line,
1175                     const char *filename, unsigned int filename_off, unsigned int lineno)
1176 {
1177         char *linepos;
1178         char *attr;
1179         struct rule_tmp rule_tmp;
1180         bool bus_warn = false;
1181         bool sysfs_warn = false;
1182         bool id_warn = false;
1183
1184         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1185         rule_tmp.rules = rules;
1186         rule_tmp.rule.type = TK_RULE;
1187         rule_tmp.rule.rule.filename_off = filename_off;
1188         rule_tmp.rule.rule.filename_line = lineno;
1189
1190         linepos = line;
1191         for (;;) {
1192                 char *key;
1193                 char *value;
1194                 enum operation_type op;
1195
1196                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1197                         break;
1198
1199                 if (strcmp(key, "ACTION") == 0) {
1200                         if (op > OP_MATCH_MAX) {
1201                                 err(rules->udev, "invalid ACTION operation\n");
1202                                 goto invalid;
1203                         }
1204                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1205                         continue;
1206                 }
1207
1208                 if (strcmp(key, "DEVPATH") == 0) {
1209                         if (op > OP_MATCH_MAX) {
1210                                 err(rules->udev, "invalid DEVPATH operation\n");
1211                                 goto invalid;
1212                         }
1213                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1214                         continue;
1215                 }
1216
1217                 if (strcmp(key, "KERNEL") == 0) {
1218                         if (op > OP_MATCH_MAX) {
1219                                 err(rules->udev, "invalid KERNEL operation\n");
1220                                 goto invalid;
1221                         }
1222                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1223                         continue;
1224                 }
1225
1226                 if (strcmp(key, "SUBSYSTEM") == 0) {
1227                         if (op > OP_MATCH_MAX) {
1228                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1229                                 goto invalid;
1230                         }
1231                         /* bus, class, subsystem events should all be the same */
1232                         if (strcmp(value, "subsystem") == 0 ||
1233                             strcmp(value, "bus") == 0 ||
1234                             strcmp(value, "class") == 0) {
1235                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1236                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1237                                             "please fix it in %s:%u", value, filename, lineno);
1238                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1239                         } else
1240                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1241                         continue;
1242                 }
1243
1244                 if (strcmp(key, "DRIVER") == 0) {
1245                         if (op > OP_MATCH_MAX) {
1246                                 err(rules->udev, "invalid DRIVER operation\n");
1247                                 goto invalid;
1248                         }
1249                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1250                         continue;
1251                 }
1252
1253                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1254                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1255                         if (attr == NULL) {
1256                                 err(rules->udev, "error parsing ATTR attribute\n");
1257                                 goto invalid;
1258                         }
1259                         if (op < OP_MATCH_MAX) {
1260                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1261                         } else {
1262                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1263                         }
1264                         continue;
1265                 }
1266
1267                 if (strcmp(key, "KERNELS") == 0) {
1268                         if (op > OP_MATCH_MAX) {
1269                                 err(rules->udev, "invalid KERNELS operation\n");
1270                                 goto invalid;
1271                         }
1272                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1273                         continue;
1274                 }
1275
1276                 if (strcmp(key, "ID") == 0) {
1277                         if (!id_warn) {
1278                                 id_warn = true;
1279                                 err(rules->udev, "ID= will be removed in a future udev version, "
1280                                     "please use KERNEL= to match the event device, or KERNELS= "
1281                                     "to match a parent device, in %s:%u\n", filename, lineno);
1282                         }
1283                         if (op > OP_MATCH_MAX) {
1284                                 err(rules->udev, "invalid KERNELS operation\n");
1285                                 goto invalid;
1286                         }
1287                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1288                         continue;
1289                 }
1290
1291                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1292                         if (op > OP_MATCH_MAX) {
1293                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1294                                 goto invalid;
1295                         }
1296                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1297                         continue;
1298                 }
1299
1300                 if (strcmp(key, "BUS") == 0) {
1301                         if (!bus_warn) {
1302                                 bus_warn = true;
1303                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1304                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1305                                     "to match a parent device, in %s:%u\n", filename, lineno);
1306                         }
1307                         if (op > OP_MATCH_MAX) {
1308                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1309                                 goto invalid;
1310                         }
1311                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1312                         continue;
1313                 }
1314
1315                 if (strcmp(key, "DRIVERS") == 0) {
1316                         if (op > OP_MATCH_MAX) {
1317                                 err(rules->udev, "invalid DRIVERS operation\n");
1318                                 goto invalid;
1319                         }
1320                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1321                         continue;
1322                 }
1323
1324                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1325                         if (op > OP_MATCH_MAX) {
1326                                 err(rules->udev, "invalid ATTRS operation\n");
1327                                 goto invalid;
1328                         }
1329                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1330                         if (attr == NULL) {
1331                                 err(rules->udev, "error parsing ATTRS attribute\n");
1332                                 goto invalid;
1333                         }
1334                         if (strncmp(attr, "device/", 7) == 0)
1335                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1336                                     "please fix it in %s:%u", filename, lineno);
1337                         else if (strstr(attr, "../") != NULL)
1338                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1339                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1340                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1341                         continue;
1342                 }
1343
1344                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1345                         if (!sysfs_warn) {
1346                                 sysfs_warn = true;
1347                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1348                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1349                                     "to match a parent device, in %s:%u\n", filename, lineno);
1350                         }
1351                         if (op > OP_MATCH_MAX) {
1352                                 err(rules->udev, "invalid ATTRS operation\n");
1353                                 goto invalid;
1354                         }
1355                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1356                         if (attr == NULL) {
1357                                 err(rules->udev, "error parsing ATTRS attribute\n");
1358                                 goto invalid;
1359                         }
1360                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1361                         continue;
1362                 }
1363
1364                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1365                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1366                         if (attr == NULL) {
1367                                 err(rules->udev, "error parsing ENV attribute\n");
1368                                 goto invalid;
1369                         }
1370                         if (op < OP_MATCH_MAX) {
1371                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1372                                         goto invalid;
1373                         } else {
1374                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1375                                         goto invalid;
1376                         }
1377                         continue;
1378                 }
1379
1380                 if (strcmp(key, "TAG") == 0) {
1381                         if (op < OP_MATCH_MAX)
1382                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1383                         else
1384                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1385                         continue;
1386                 }
1387
1388                 if (strcmp(key, "PROGRAM") == 0) {
1389                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1390                         continue;
1391                 }
1392
1393                 if (strcmp(key, "RESULT") == 0) {
1394                         if (op > OP_MATCH_MAX) {
1395                                 err(rules->udev, "invalid RESULT operation\n");
1396                                 goto invalid;
1397                         }
1398                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1399                         continue;
1400                 }
1401
1402                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1403                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1404                         if (attr != NULL && strstr(attr, "program")) {
1405                                 dbg(rules->udev, "IMPORT will be executed\n");
1406                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1407                         } else if (attr != NULL && strstr(attr, "file")) {
1408                                 dbg(rules->udev, "IMPORT will be included as file\n");
1409                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1410                         } else if (attr != NULL && strstr(attr, "db")) {
1411                                 dbg(rules->udev, "IMPORT will include db values\n");
1412                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1413                         } else if (attr != NULL && strstr(attr, "cmdline")) {
1414                                 dbg(rules->udev, "IMPORT will include db values\n");
1415                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1416                         } else if (attr != NULL && strstr(attr, "parent")) {
1417                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1418                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1419                         } else {
1420                                 /* figure it out if it is executable */
1421                                 char file[UTIL_PATH_SIZE];
1422                                 char *pos;
1423                                 struct stat statbuf;
1424
1425                                 /* allow programs in /lib/udev called without the path */
1426                                 if (value[0] != '/')
1427                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1428                                 else
1429                                         util_strscpy(file, sizeof(file), value);
1430                                 pos = strchr(file, ' ');
1431                                 if (pos)
1432                                         pos[0] = '\0';
1433                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1434                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1435                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1436                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1437                                 } else {
1438                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1439                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1440                                 }
1441                         }
1442                         continue;
1443                 }
1444
1445                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1446                         mode_t mode = 0;
1447
1448                         if (op > OP_MATCH_MAX) {
1449                                 err(rules->udev, "invalid TEST operation\n");
1450                                 goto invalid;
1451                         }
1452                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1453                         if (attr != NULL) {
1454                                 mode = strtol(attr, NULL, 8);
1455                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1456                         } else {
1457                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1458                         }
1459                         continue;
1460                 }
1461
1462                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1463                         int flag = 0;
1464
1465                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1466                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1467                                 flag = 1;
1468                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1469                         continue;
1470                 }
1471
1472                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1473                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1474                         continue;
1475                 }
1476
1477                 if (strcmp(key, "LABEL") == 0) {
1478                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1479                         continue;
1480                 }
1481
1482                 if (strcmp(key, "GOTO") == 0) {
1483                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1484                         continue;
1485                 }
1486
1487                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1488                         if (op < OP_MATCH_MAX) {
1489                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1490                         } else {
1491                                 if (strcmp(value, "%k") == 0) {
1492                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1493                                             "please remove it from %s:%u\n", filename, lineno);
1494                                         continue;
1495                                 }
1496                                 if (value[0] == '\0') {
1497                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1498                                              "please remove it from %s:%u\n", filename, lineno);
1499                                         continue;
1500                                 }
1501                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1502                         }
1503                         rule_tmp.rule.rule.can_set_name = true;
1504                         continue;
1505                 }
1506
1507                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1508                         if (op < OP_MATCH_MAX) {
1509                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1510                         } else {
1511                                 int flag = 0;
1512
1513                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1514                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1515                                         flag = 1;
1516                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1517                         }
1518                         rule_tmp.rule.rule.can_set_name = true;
1519                         continue;
1520                 }
1521
1522                 if (strcmp(key, "OWNER") == 0) {
1523                         uid_t uid;
1524                         char *endptr;
1525
1526                         uid = strtoul(value, &endptr, 10);
1527                         if (endptr[0] == '\0') {
1528                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1529                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1530                                 uid = add_uid(rules, value);
1531                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1532                         } else if (rules->resolve_names >= 0) {
1533                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1534                         }
1535                         rule_tmp.rule.rule.can_set_name = true;
1536                         continue;
1537                 }
1538
1539                 if (strcmp(key, "GROUP") == 0) {
1540                         gid_t gid;
1541                         char *endptr;
1542
1543                         gid = strtoul(value, &endptr, 10);
1544                         if (endptr[0] == '\0') {
1545                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1546                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1547                                 gid = add_gid(rules, value);
1548                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1549                         } else if (rules->resolve_names >= 0) {
1550                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1551                         }
1552                         rule_tmp.rule.rule.can_set_name = true;
1553                         continue;
1554                 }
1555
1556                 if (strncmp(key, "SMACK", sizeof("SMACK")-1) == 0) {
1557                         if (value[0] == '\0') {
1558                                 info(rules->udev, "SMACK=\"\" is ignored, invalid label \"\" "
1559                                      "please remove it from %s:%u\n", filename, lineno);
1560                                 continue;
1561                         }
1562
1563                         if (strnlen(value, SMK_MAXLEN + 1) > SMK_MAXLEN) {
1564                                 info(rules->udev, "SMACK=\"%s\" is ignored, label \"%s\" exceeds %d characters "
1565                                      "please remove it from %s:%u\n", value, value, SMK_MAXLEN, filename, lineno);
1566                                 continue;
1567                         }
1568
1569                         rule_add_key(&rule_tmp, TK_A_SMACK, op, value, NULL);
1570                         rule_tmp.rule.rule.can_set_name = true;
1571                         continue;
1572                 }
1573
1574                 if (strcmp(key, "MODE") == 0) {
1575                         mode_t mode;
1576                         char *endptr;
1577
1578                         mode = strtol(value, &endptr, 8);
1579                         if (endptr[0] == '\0')
1580                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1581                         else
1582                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1583                         rule_tmp.rule.rule.can_set_name = true;
1584                         continue;
1585                 }
1586
1587                 if (strcmp(key, "OPTIONS") == 0) {
1588                         const char *pos;
1589
1590                         pos = strstr(value, "link_priority=");
1591                         if (pos != NULL) {
1592                                 int prio = atoi(&pos[strlen("link_priority=")]);
1593
1594                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1595                                 dbg(rules->udev, "link priority=%i\n", prio);
1596                         }
1597                         pos = strstr(value, "event_timeout=");
1598                         if (pos != NULL) {
1599                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1600
1601                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, op, NULL, &tout);
1602                                 dbg(rules->udev, "event timeout=%i\n", tout);
1603                         }
1604                         pos = strstr(value, "string_escape=");
1605                         if (pos != NULL) {
1606                                 pos = &pos[strlen("string_escape=")];
1607                                 if (strncmp(pos, "none", strlen("none")) == 0)
1608                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1609                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1610                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1611                         }
1612                         pos = strstr(value, "nowatch");
1613                         if (pos != NULL) {
1614                                 const int off = 0;
1615
1616                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1617                                 dbg(rules->udev, "inotify watch of device disabled\n");
1618                         } else {
1619                                 pos = strstr(value, "watch");
1620                                 if (pos != NULL) {
1621                                         const int on = 1;
1622
1623                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1624                                         dbg(rules->udev, "inotify watch of device requested\n");
1625                                 }
1626                         }
1627                         pos = strstr(value, "static_node=");
1628                         if (pos != NULL) {
1629                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1630                                 rule_tmp.rule.rule.has_static_node = true;
1631                         }
1632                         continue;
1633                 }
1634                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1635         }
1636
1637         /* add rule token */
1638         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1639         if (add_token(rules, &rule_tmp.rule) != 0)
1640                 goto invalid;
1641
1642         /* add tokens to list, sorted by type */
1643         if (sort_token(rules, &rule_tmp) != 0)
1644                 goto invalid;
1645
1646         return 0;
1647 invalid:
1648         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1649         return -1;
1650 }
1651
1652 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1653 {
1654         FILE *f;
1655         unsigned int first_token;
1656         char line[UTIL_LINE_SIZE];
1657         int line_nr = 0;
1658         unsigned int i;
1659
1660         info(rules->udev, "reading '%s' as rules file\n", filename);
1661
1662         f = fopen(filename, "r");
1663         if (f == NULL)
1664                 return -1;
1665
1666         first_token = rules->token_cur;
1667
1668         while (fgets(line, sizeof(line), f) != NULL) {
1669                 char *key;
1670                 size_t len;
1671
1672                 /* skip whitespace */
1673                 line_nr++;
1674                 key = line;
1675                 while (isspace(key[0]))
1676                         key++;
1677
1678                 /* comment */
1679                 if (key[0] == '#')
1680                         continue;
1681
1682                 len = strlen(line);
1683                 if (len < 3)
1684                         continue;
1685
1686                 /* continue reading if backslash+newline is found */
1687                 while (line[len-2] == '\\') {
1688                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1689                                 break;
1690                         if (strlen(&line[len-2]) < 2)
1691                                 break;
1692                         line_nr++;
1693                         len = strlen(line);
1694                 }
1695
1696                 if (len+1 >= sizeof(line)) {
1697                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1698                         continue;
1699                 }
1700                 add_rule(rules, key, filename, filename_off, line_nr);
1701         }
1702         fclose(f);
1703
1704         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1705         for (i = first_token+1; i < rules->token_cur; i++) {
1706                 if (rules->tokens[i].type == TK_A_GOTO) {
1707                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1708                         unsigned int j;
1709
1710                         for (j = i+1; j < rules->token_cur; j++) {
1711                                 if (rules->tokens[j].type != TK_RULE)
1712                                         continue;
1713                                 if (rules->tokens[j].rule.label_off == 0)
1714                                         continue;
1715                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1716                                         continue;
1717                                 rules->tokens[i].key.rule_goto = j;
1718                                 break;
1719                         }
1720                         if (rules->tokens[i].key.rule_goto == 0)
1721                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1722                 }
1723         }
1724         return 0;
1725 }
1726
1727 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1728 {
1729         DIR *dir;
1730         char filename[UTIL_PATH_SIZE];
1731
1732         dbg(udev, "open directory '%s'\n", dirname);
1733         dir = opendir(dirname);
1734         if (dir == NULL) {
1735                 info(udev, "unable to open '%s': %m\n", dirname);
1736                 return -1;
1737         }
1738
1739         for (;;) {
1740                 struct dirent *dent;
1741
1742                 dent = readdir(dir);
1743                 if (dent == NULL || dent->d_name[0] == '\0')
1744                         break;
1745
1746                 if (dent->d_name[0] == '.')
1747                         continue;
1748
1749                 /* look for file matching with specified suffix */
1750                 if (suffix != NULL) {
1751                         const char *ext;
1752
1753                         ext = strrchr(dent->d_name, '.');
1754                         if (ext == NULL)
1755                                 continue;
1756                         if (strcmp(ext, suffix) != 0)
1757                                 continue;
1758                 }
1759                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1760                 dbg(udev, "put file '%s' into list\n", filename);
1761                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1762         }
1763
1764         closedir(dir);
1765         return 0;
1766 }
1767
1768 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1769 {
1770         struct udev_rules *rules;
1771         struct stat statbuf;
1772         struct udev_list_node file_list;
1773         struct udev_list_entry *file_loop, *file_tmp;
1774         struct token end_token;
1775
1776         rules = calloc(1, sizeof(struct udev_rules));
1777         if (rules == NULL)
1778                 return NULL;
1779         rules->udev = udev;
1780         rules->resolve_names = resolve_names;
1781         udev_list_init(&file_list);
1782
1783         /* init token array and string buffer */
1784         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1785         if (rules->tokens == NULL) {
1786                 free(rules);
1787                 return NULL;
1788         }
1789         rules->token_max = PREALLOC_TOKEN;
1790
1791         rules->buf = malloc(PREALLOC_STRBUF);
1792         if (rules->buf == NULL) {
1793                 free(rules->tokens);
1794                 free(rules);
1795                 return NULL;
1796         }
1797         rules->buf_max = PREALLOC_STRBUF;
1798         /* offset 0 is always '\0' */
1799         rules->buf[0] = '\0';
1800         rules->buf_cur = 1;
1801         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1802             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1803
1804         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1805         if (rules->trie_nodes == NULL) {
1806                 free(rules->buf);
1807                 free(rules->tokens);
1808                 free(rules);
1809                 return NULL;
1810         }
1811         rules->trie_nodes_max = PREALLOC_TRIE;
1812         /* offset 0 is the trie root, with an empty string */
1813         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1814         rules->trie_nodes_cur = 1;
1815
1816         if (udev_get_rules_path(udev) != NULL) {
1817                 /* custom rules location for testing */
1818                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1819         } else {
1820                 char filename[PATH_MAX];
1821                 struct udev_list_node sort_list;
1822                 struct udev_list_entry *sort_loop, *sort_tmp;
1823
1824                 /* read user/custom rules */
1825                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1826
1827                 /* read dynamic/temporary rules */
1828                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1829                 udev_list_init(&sort_list);
1830                 add_matching_files(udev, &sort_list, filename, ".rules");
1831
1832                 /* read default rules */
1833                 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1834
1835                 /* sort all rules files by basename into list of files */
1836                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1837                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1838                         const char *sort_base = strrchr(sort_name, '/');
1839
1840                         if (sort_base == NULL)
1841                                 continue;
1842                         /* sort entry into existing list */
1843                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1844                                 const char *file_name = udev_list_entry_get_name(file_loop);
1845                                 const char *file_base = strrchr(file_name, '/');
1846
1847                                 if (file_base == NULL)
1848                                         continue;
1849                                 if (strcmp(file_base, sort_base) == 0) {
1850                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1851                                              file_name, sort_name);
1852                                         udev_list_entry_delete(sort_loop);
1853                                         sort_loop = NULL;
1854                                         break;
1855                                 }
1856                                 if (strcmp(file_base, sort_base) > 0) {
1857                                         /* found later file, insert before */
1858                                         udev_list_entry_remove(sort_loop);
1859                                         udev_list_entry_insert_before(sort_loop, file_loop);
1860                                         sort_loop = NULL;
1861                                         break;
1862                                 }
1863                         }
1864                         /* current file already handled */
1865                         if (sort_loop == NULL)
1866                                 continue;
1867                         /* no later file, append to end of list */
1868                         udev_list_entry_remove(sort_loop);
1869                         udev_list_entry_append(sort_loop, &file_list);
1870                 }
1871         }
1872
1873         /* add all filenames to the string buffer */
1874         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1875                 const char *filename = udev_list_entry_get_name(file_loop);
1876                 unsigned int filename_off;
1877
1878                 filename_off = add_string(rules, filename);
1879                 /* the offset in the rule is limited to unsigned short */
1880                 if (filename_off < USHRT_MAX)
1881                         udev_list_entry_set_flags(file_loop, filename_off);
1882         }
1883
1884         /* parse list of files */
1885         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1886                 const char *filename = udev_list_entry_get_name(file_loop);
1887                 unsigned int filename_off = udev_list_entry_get_flags(file_loop);
1888
1889                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1890                         parse_file(rules, filename, filename_off);
1891                 else
1892                         err(udev, "can not read '%s'\n", filename);
1893                 udev_list_entry_delete(file_loop);
1894         }
1895
1896         memset(&end_token, 0x00, sizeof(struct token));
1897         end_token.type = TK_END;
1898         add_token(rules, &end_token);
1899
1900         /* shrink allocated token and string buffer */
1901         if (rules->token_cur < rules->token_max) {
1902                 struct token *tokens;
1903
1904                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1905                 if (tokens != NULL || rules->token_cur == 0) {
1906                         rules->tokens = tokens;
1907                         rules->token_max = rules->token_cur;
1908                 }
1909         }
1910         if (rules->buf_cur < rules->buf_max) {
1911                 char *buf;
1912
1913                 buf = realloc(rules->buf, rules->buf_cur);
1914                 if (buf != NULL || rules->buf_cur == 0) {
1915                         rules->buf = buf;
1916                         rules->buf_max = rules->buf_cur;
1917                 }
1918         }
1919         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1920              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1921         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1922              rules->trie_nodes_cur * sizeof(struct trie_node),
1923              rules->trie_nodes_cur, sizeof(struct trie_node));
1924
1925         /* cleanup trie */
1926         free(rules->trie_nodes);
1927         rules->trie_nodes = NULL;
1928         rules->trie_nodes_cur = 0;
1929         rules->trie_nodes_max = 0;
1930
1931         /* cleanup uid/gid cache */
1932         free(rules->uids);
1933         rules->uids = NULL;
1934         rules->uids_cur = 0;
1935         rules->uids_max = 0;
1936         free(rules->gids);
1937         rules->gids = NULL;
1938         rules->gids_cur = 0;
1939         rules->gids_max = 0;
1940
1941         dump_rules(rules);
1942         return rules;
1943 }
1944
1945 void udev_rules_unref(struct udev_rules *rules)
1946 {
1947         if (rules == NULL)
1948                 return;
1949         free(rules->tokens);
1950         free(rules->buf);
1951         free(rules->trie_nodes);
1952         free(rules->uids);
1953         free(rules->gids);
1954         free(rules);
1955 }
1956
1957 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1958 {
1959         char *key_value = &rules->buf[token->key.value_off];
1960         char *pos;
1961         bool match = false;
1962
1963         if (val == NULL)
1964                 val = "";
1965
1966         switch (token->key.glob) {
1967         case GL_PLAIN:
1968                 match = (strcmp(key_value, val) == 0);
1969                 break;
1970         case GL_GLOB:
1971                 match = (fnmatch(key_value, val, 0) == 0);
1972                 break;
1973         case GL_SPLIT:
1974                 {
1975                         const char *split;
1976                         size_t len;
1977
1978                         split = &rules->buf[token->key.value_off];
1979                         len = strlen(val);
1980                         for (;;) {
1981                                 const char *next;
1982
1983                                 next = strchr(split, '|');
1984                                 if (next != NULL) {
1985                                         size_t matchlen = (size_t)(next - split);
1986
1987                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1988                                         if (match)
1989                                                 break;
1990                                 } else {
1991                                         match = (strcmp(split, val) == 0);
1992                                         break;
1993                                 }
1994                                 split = &next[1];
1995                         }
1996                         break;
1997                 }
1998         case GL_SPLIT_GLOB:
1999                 {
2000                         char value[UTIL_PATH_SIZE];
2001
2002                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
2003                         key_value = value;
2004                         while (key_value != NULL) {
2005                                 pos = strchr(key_value, '|');
2006                                 if (pos != NULL) {
2007                                         pos[0] = '\0';
2008                                         pos = &pos[1];
2009                                 }
2010                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
2011                                 match = (fnmatch(key_value, val, 0) == 0);
2012                                 if (match)
2013                                         break;
2014                                 key_value = pos;
2015                         }
2016                         break;
2017                 }
2018         case GL_SOMETHING:
2019                 match = (val[0] != '\0');
2020                 break;
2021         case GL_UNSET:
2022                 return -1;
2023         }
2024
2025         if (match && (token->key.op == OP_MATCH)) {
2026                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
2027                 return 0;
2028         }
2029         if (!match && (token->key.op == OP_NOMATCH)) {
2030                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
2031                 return 0;
2032         }
2033         dbg(rules->udev, "%s is not true\n", token_str(token->type));
2034         return -1;
2035 }
2036
2037 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
2038 {
2039         const char *name;
2040         char nbuf[UTIL_NAME_SIZE];
2041         const char *value;
2042         char vbuf[UTIL_NAME_SIZE];
2043         size_t len;
2044
2045         name = &rules->buf[cur->key.attr_off];
2046         switch (cur->key.attrsubst) {
2047         case SB_FORMAT:
2048                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2049                 name = nbuf;
2050                 /* fall through */
2051         case SB_NONE:
2052                 value = udev_device_get_sysattr_value(dev, name);
2053                 if (value == NULL)
2054                         return -1;
2055                 break;
2056         case SB_SUBSYS:
2057                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2058                         return -1;
2059                 value = vbuf;
2060                 break;
2061         default:
2062                 return -1;
2063         }
2064
2065         /* remove trailing whitespace, if not asked to match for it */
2066         len = strlen(value);
2067         if (len > 0 && isspace(value[len-1])) {
2068                 const char *key_value;
2069                 size_t klen;
2070
2071                 key_value = &rules->buf[cur->key.value_off];
2072                 klen = strlen(key_value);
2073                 if (klen > 0 && !isspace(key_value[klen-1])) {
2074                         if (value != vbuf) {
2075                                 util_strscpy(vbuf, sizeof(vbuf), value);
2076                                 value = vbuf;
2077                         }
2078                         while (len > 0 && isspace(vbuf[--len]))
2079                                 vbuf[len] = '\0';
2080                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2081                 }
2082         }
2083
2084         return match_key(rules, cur, value);
2085 }
2086
2087 enum escape_type {
2088         ESCAPE_UNSET,
2089         ESCAPE_NONE,
2090         ESCAPE_REPLACE,
2091 };
2092
2093 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2094 {
2095         struct token *cur;
2096         struct token *rule;
2097         enum escape_type esc = ESCAPE_UNSET;
2098         bool can_set_name;
2099
2100         if (rules->tokens == NULL)
2101                 return -1;
2102
2103         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2104                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2105                          udev_device_get_ifindex(event->dev) > 0));
2106
2107         /* loop through token list, match, run actions or forward to next rule */
2108         cur = &rules->tokens[0];
2109         rule = cur;
2110         for (;;) {
2111                 dump_token(rules, cur);
2112                 switch (cur->type) {
2113                 case TK_RULE:
2114                         /* current rule */
2115                         rule = cur;
2116                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2117                         if (!can_set_name && rule->rule.can_set_name)
2118                                 goto nomatch;
2119                         esc = ESCAPE_UNSET;
2120                         break;
2121                 case TK_M_ACTION:
2122                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2123                                 goto nomatch;
2124                         break;
2125                 case TK_M_DEVPATH:
2126                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2127                                 goto nomatch;
2128                         break;
2129                 case TK_M_KERNEL:
2130                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2131                                 goto nomatch;
2132                         break;
2133                 case TK_M_DEVLINK:
2134                         {
2135                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2136                                 struct udev_list_entry *list_entry;
2137                                 bool match = false;
2138
2139                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2140                                         const char *devlink;
2141
2142                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2143                                         if (match_key(rules, cur, devlink) == 0) {
2144                                                 match = true;
2145                                                 break;
2146                                         }
2147                                 }
2148                                 if (!match)
2149                                         goto nomatch;
2150                                 break;
2151                         }
2152                 case TK_M_NAME:
2153                         if (match_key(rules, cur, event->name) != 0)
2154                                 goto nomatch;
2155                         break;
2156                 case TK_M_ENV:
2157                         {
2158                                 const char *key_name = &rules->buf[cur->key.attr_off];
2159                                 const char *value;
2160
2161                                 value = udev_device_get_property_value(event->dev, key_name);
2162                                 if (value == NULL) {
2163                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2164                                         value = "";
2165                                 }
2166                                 if (match_key(rules, cur, value))
2167                                         goto nomatch;
2168                                 break;
2169                         }
2170                 case TK_M_TAG:
2171                         {
2172                                 struct udev_list_entry *list_entry;
2173                                 bool match = false;
2174
2175                                 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2176                                         if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2177                                                 match = true;
2178                                                 break;
2179                                         }
2180                                 }
2181                                 if (!match && (cur->key.op != OP_NOMATCH))
2182                                         goto nomatch;
2183                                 break;
2184                         }
2185                 case TK_M_SUBSYSTEM:
2186                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2187                                 goto nomatch;
2188                         break;
2189                 case TK_M_DRIVER:
2190                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2191                                 goto nomatch;
2192                         break;
2193                 case TK_M_WAITFOR:
2194                         {
2195                                 char filename[UTIL_PATH_SIZE];
2196                                 int found;
2197
2198                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2199                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2200                                 if (!found && (cur->key.op != OP_NOMATCH))
2201                                         goto nomatch;
2202                                 break;
2203                         }
2204                 case TK_M_ATTR:
2205                         if (match_attr(rules, event->dev, event, cur) != 0)
2206                                 goto nomatch;
2207                         break;
2208                 case TK_M_KERNELS:
2209                 case TK_M_SUBSYSTEMS:
2210                 case TK_M_DRIVERS:
2211                 case TK_M_ATTRS:
2212                         {
2213                                 struct token *next;
2214
2215                                 /* get whole sequence of parent matches */
2216                                 next = cur;
2217                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2218                                         next++;
2219
2220                                 /* loop over parents */
2221                                 event->dev_parent = event->dev;
2222                                 for (;;) {
2223                                         struct token *key;
2224
2225                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2226                                         /* loop over sequence of parent match keys */
2227                                         for (key = cur; key < next; key++ ) {
2228                                                 dump_token(rules, key);
2229                                                 switch(key->type) {
2230                                                 case TK_M_KERNELS:
2231                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2232                                                                 goto try_parent;
2233                                                         break;
2234                                                 case TK_M_SUBSYSTEMS:
2235                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2236                                                                 goto try_parent;
2237                                                         break;
2238                                                 case TK_M_DRIVERS:
2239                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2240                                                                 goto try_parent;
2241                                                         break;
2242                                                 case TK_M_ATTRS:
2243                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2244                                                                 goto try_parent;
2245                                                         break;
2246                                                 default:
2247                                                         goto nomatch;
2248                                                 }
2249                                                 dbg(event->udev, "parent key matched\n");
2250                                         }
2251                                         dbg(event->udev, "all parent keys matched\n");
2252                                         /* all keys matched */
2253                                         break;
2254
2255                                 try_parent:
2256                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2257                                         if (event->dev_parent == NULL)
2258                                                 goto nomatch;
2259                                 }
2260                                 /* move behind our sequence of parent match keys */
2261                                 cur = next;
2262                                 continue;
2263                         }
2264                 case TK_M_TEST:
2265                         {
2266                                 char filename[UTIL_PATH_SIZE];
2267                                 struct stat statbuf;
2268                                 int match;
2269
2270                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2271                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2272                                         if (filename[0] != '/') {
2273                                                 char tmp[UTIL_PATH_SIZE];
2274
2275                                                 util_strscpy(tmp, sizeof(tmp), filename);
2276                                                 util_strscpyl(filename, sizeof(filename),
2277                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2278                                         }
2279                                 }
2280                                 attr_subst_subdir(filename, sizeof(filename));
2281
2282                                 match = (stat(filename, &statbuf) == 0);
2283                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2284                                 if (match && cur->key.mode > 0) {
2285                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2286                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2287                                             match ? "matches" : "does not match", cur->key.mode);
2288                                 }
2289                                 if (match && cur->key.op == OP_NOMATCH)
2290                                         goto nomatch;
2291                                 if (!match && cur->key.op == OP_MATCH)
2292                                         goto nomatch;
2293                                 break;
2294                         }
2295                 case TK_M_PROGRAM:
2296                         {
2297                                 char program[UTIL_PATH_SIZE];
2298                                 char **envp;
2299                                 char result[UTIL_PATH_SIZE];
2300
2301                                 free(event->program_result);
2302                                 event->program_result = NULL;
2303                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2304                                 envp = udev_device_get_properties_envp(event->dev);
2305                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2306                                      program,
2307                                      &rules->buf[rule->rule.filename_off],
2308                                      rule->rule.filename_line);
2309                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL, false) != 0) {
2310                                         if (cur->key.op != OP_NOMATCH)
2311                                                 goto nomatch;
2312                                 } else {
2313                                         int count;
2314
2315                                         util_remove_trailing_chars(result, '\n');
2316                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2317                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2318                                                 if (count > 0)
2319                                                         info(event->udev, "%i character(s) replaced\n" , count);
2320                                         }
2321                                         event->program_result = strdup(result);
2322                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2323                                         if (cur->key.op == OP_NOMATCH)
2324                                                 goto nomatch;
2325                                 }
2326                                 break;
2327                         }
2328                 case TK_M_IMPORT_FILE:
2329                         {
2330                                 char import[UTIL_PATH_SIZE];
2331
2332                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2333                                 if (import_file_into_properties(event->dev, import) != 0)
2334                                         if (cur->key.op != OP_NOMATCH)
2335                                                 goto nomatch;
2336                                 break;
2337                         }
2338                 case TK_M_IMPORT_PROG:
2339                         {
2340                                 char import[UTIL_PATH_SIZE];
2341
2342                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2343                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2344                                      import,
2345                                      &rules->buf[rule->rule.filename_off],
2346                                      rule->rule.filename_line);
2347                                 if (import_program_into_properties(event->dev, import) != 0)
2348                                         if (cur->key.op != OP_NOMATCH)
2349                                                 goto nomatch;
2350                                 break;
2351                         }
2352                 case TK_M_IMPORT_DB:
2353                         {
2354                                 const char *key = &rules->buf[cur->key.value_off];
2355                                 const char *value;
2356
2357                                 value = udev_device_get_property_value(event->dev_db, key);
2358                                 if (value != NULL) {
2359                                         struct udev_list_entry *entry;
2360
2361                                         entry = udev_device_add_property(event->dev, key, value);
2362                                         udev_list_entry_set_flags(entry, 1);
2363                                 } else {
2364                                         if (cur->key.op != OP_NOMATCH)
2365                                                 goto nomatch;
2366                                 }
2367                                 break;
2368                         }
2369                 case TK_M_IMPORT_CMDLINE:
2370                         {
2371                                 FILE *f;
2372                                 bool imported = false;
2373
2374                                 f = fopen("/proc/cmdline", "r");
2375                                 if (f != NULL) {
2376                                         char cmdline[4096];
2377
2378                                         if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2379                                                 const char *key = &rules->buf[cur->key.value_off];
2380                                                 char *pos;
2381
2382                                                 pos = strstr(cmdline, key);
2383                                                 if (pos != NULL) {
2384                                                         struct udev_list_entry *entry;
2385
2386                                                         pos += strlen(key);
2387                                                         if (pos[0] == '\0' || isspace(pos[0])) {
2388                                                                 /* we import simple flags as 'FLAG=1' */
2389                                                                 entry = udev_device_add_property(event->dev, key, "1");
2390                                                                 udev_list_entry_set_flags(entry, 1);
2391                                                                 imported = true;
2392                                                         } else if (pos[0] == '=') {
2393                                                                 const char *value;
2394
2395                                                                 pos++;
2396                                                                 value = pos;
2397                                                                 while (pos[0] != '\0' && !isspace(pos[0]))
2398                                                                         pos++;
2399                                                                 pos[0] = '\0';
2400                                                                 entry = udev_device_add_property(event->dev, key, value);
2401                                                                 udev_list_entry_set_flags(entry, 1);
2402                                                                 imported = true;
2403                                                         }
2404                                                 }
2405                                         }
2406                                         fclose(f);
2407                                 }
2408                                 if (!imported && cur->key.op != OP_NOMATCH)
2409                                         goto nomatch;
2410                                 break;
2411                         }
2412                 case TK_M_IMPORT_PARENT:
2413                         {
2414                                 char import[UTIL_PATH_SIZE];
2415
2416                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2417                                 if (import_parent_into_properties(event->dev, import) != 0)
2418                                         if (cur->key.op != OP_NOMATCH)
2419                                                 goto nomatch;
2420                                 break;
2421                         }
2422                 case TK_M_RESULT:
2423                         if (match_key(rules, cur, event->program_result) != 0)
2424                                 goto nomatch;
2425                         break;
2426                 case TK_A_STRING_ESCAPE_NONE:
2427                         esc = ESCAPE_NONE;
2428                         break;
2429                 case TK_A_STRING_ESCAPE_REPLACE:
2430                         esc = ESCAPE_REPLACE;
2431                         break;
2432                 case TK_A_INOTIFY_WATCH:
2433                         if (event->inotify_watch_final)
2434                                 break;
2435                         if (cur->key.op == OP_ASSIGN_FINAL)
2436                                 event->inotify_watch_final = true;
2437                         event->inotify_watch = cur->key.watch;
2438                         break;
2439                 case TK_A_DEVLINK_PRIO:
2440                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2441                         break;
2442                 case TK_A_OWNER:
2443                         {
2444                                 char owner[UTIL_NAME_SIZE];
2445
2446                                 if (event->owner_final)
2447                                         break;
2448                                 if (cur->key.op == OP_ASSIGN_FINAL)
2449                                         event->owner_final = true;
2450                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2451                                 event->uid = util_lookup_user(event->udev, owner);
2452                                 info(event->udev, "OWNER %u %s:%u\n",
2453                                      event->uid,
2454                                      &rules->buf[rule->rule.filename_off],
2455                                      rule->rule.filename_line);
2456                                 break;
2457                         }
2458                 case TK_A_GROUP:
2459                         {
2460                                 char group[UTIL_NAME_SIZE];
2461
2462                                 if (event->group_final)
2463                                         break;
2464                                 if (cur->key.op == OP_ASSIGN_FINAL)
2465                                         event->group_final = true;
2466                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2467                                 event->gid = util_lookup_group(event->udev, group);
2468                                 info(event->udev, "GROUP %u %s:%u\n",
2469                                      event->gid,
2470                                      &rules->buf[rule->rule.filename_off],
2471                                      rule->rule.filename_line);
2472                                 break;
2473                         }
2474                 case TK_A_SMACK:
2475                 {
2476                         const char *smack  = &rules->buf[cur->key.value_off];
2477                         char smack_str[UTIL_PATH_SIZE];
2478
2479                         if (event->smack_final)
2480                                 break;
2481                         if (cur->key.op == OP_ASSIGN_FINAL)
2482                                 event->smack_final = true;
2483
2484                         udev_event_apply_format(event, smack, smack_str, sizeof(smack_str));
2485                         free(event->smack);
2486                         event->smack = strdup(smack_str);
2487
2488                         info(event->udev, "SMACK '%s' %s:%u\n",
2489                              event->smack,
2490                              &rules->buf[rule->rule.filename_off],
2491                              rule->rule.filename_line);
2492                         break;
2493                 }
2494                 case TK_A_MODE:
2495                         {
2496                                 char mode[UTIL_NAME_SIZE];
2497                                 char *endptr;
2498
2499                                 if (event->mode_final)
2500                                         break;
2501                                 if (cur->key.op == OP_ASSIGN_FINAL)
2502                                         event->mode_final = true;
2503                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2504                                 event->mode = strtol(mode, &endptr, 8);
2505                                 if (endptr[0] != '\0') {
2506                                         err(event->udev, "invalide mode '%s' set default mode 0600\n", mode);
2507                                         event->mode = 0600;
2508                                 }
2509                                 info(event->udev, "MODE %#o %s:%u\n",
2510                                      event->mode,
2511                                      &rules->buf[rule->rule.filename_off],
2512                                      rule->rule.filename_line);
2513                                 break;
2514                         }
2515                 case TK_A_OWNER_ID:
2516                         if (event->owner_final)
2517                                 break;
2518                         if (cur->key.op == OP_ASSIGN_FINAL)
2519                                 event->owner_final = true;
2520                         event->uid = cur->key.uid;
2521                         info(event->udev, "OWNER %u %s:%u\n",
2522                              event->uid,
2523                              &rules->buf[rule->rule.filename_off],
2524                              rule->rule.filename_line);
2525                         break;
2526                 case TK_A_GROUP_ID:
2527                         if (event->group_final)
2528                                 break;
2529                         if (cur->key.op == OP_ASSIGN_FINAL)
2530                                 event->group_final = true;
2531                         event->gid = cur->key.gid;
2532                         info(event->udev, "GROUP %u %s:%u\n",
2533                              event->gid,
2534                              &rules->buf[rule->rule.filename_off],
2535                              rule->rule.filename_line);
2536                         break;
2537                 case TK_A_MODE_ID:
2538                         if (event->mode_final)
2539                                 break;
2540                         if (cur->key.op == OP_ASSIGN_FINAL)
2541                                 event->mode_final = true;
2542                         event->mode = cur->key.mode;
2543                         info(event->udev, "MODE %#o %s:%u\n",
2544                              event->mode,
2545                              &rules->buf[rule->rule.filename_off],
2546                              rule->rule.filename_line);
2547                         break;
2548                 case TK_A_STATIC_NODE:
2549                         break;
2550                 case TK_A_ENV:
2551                         {
2552                                 const char *name = &rules->buf[cur->key.attr_off];
2553                                 char *value = &rules->buf[cur->key.value_off];
2554
2555                                 if (value[0] != '\0') {
2556                                         char temp_value[UTIL_NAME_SIZE];
2557                                         struct udev_list_entry *entry;
2558
2559                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2560                                         entry = udev_device_add_property(event->dev, name, temp_value);
2561                                         /* store in db, skip private keys */
2562                                         if (name[0] != '.')
2563                                                 udev_list_entry_set_flags(entry, 1);
2564                                 } else {
2565                                         udev_device_add_property(event->dev, name, NULL);
2566                                 }
2567                                 break;
2568                         }
2569                 case TK_A_TAG:
2570                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2571                                 udev_device_cleanup_tags_list(event->dev);
2572                         udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
2573                         break;
2574                 case TK_A_NAME:
2575                         {
2576                                 const char *name  = &rules->buf[cur->key.value_off];
2577                                 char name_str[UTIL_PATH_SIZE];
2578                                 int count;
2579
2580                                 if (event->name_final)
2581                                         break;
2582                                 if (cur->key.op == OP_ASSIGN_FINAL)
2583                                         event->name_final = true;
2584                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2585                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2586                                         count = udev_util_replace_chars(name_str, "/");
2587                                         if (count > 0)
2588                                                 info(event->udev, "%i character(s) replaced\n", count);
2589                                 }
2590                                 free(event->name);
2591                                 event->name = strdup(name_str);
2592                                 info(event->udev, "NAME '%s' %s:%u\n",
2593                                      event->name,
2594                                      &rules->buf[rule->rule.filename_off],
2595                                      rule->rule.filename_line);
2596                                 break;
2597                         }
2598                 case TK_A_DEVLINK:
2599                         {
2600                                 char temp[UTIL_PATH_SIZE];
2601                                 char filename[UTIL_PATH_SIZE];
2602                                 char *pos, *next;
2603                                 int count = 0;
2604
2605                                 if (event->devlink_final)
2606                                         break;
2607                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2608                                         break;
2609                                 if (cur->key.op == OP_ASSIGN_FINAL)
2610                                         event->devlink_final = true;
2611                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2612                                         udev_device_cleanup_devlinks_list(event->dev);
2613
2614                                 /* allow  multiple symlinks separated by spaces */
2615                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2616                                 if (esc == ESCAPE_UNSET)
2617                                         count = udev_util_replace_chars(temp, "/ ");
2618                                 else if (esc == ESCAPE_REPLACE)
2619                                         count = udev_util_replace_chars(temp, "/");
2620                                 if (count > 0)
2621                                         info(event->udev, "%i character(s) replaced\n" , count);
2622                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2623                                 pos = temp;
2624                                 while (isspace(pos[0]))
2625                                         pos++;
2626                                 next = strchr(pos, ' ');
2627                                 while (next != NULL) {
2628                                         next[0] = '\0';
2629                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2630                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2631                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2632                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2633                                         while (isspace(next[1]))
2634                                                 next++;
2635                                         pos = &next[1];
2636                                         next = strchr(pos, ' ');
2637                                 }
2638                                 if (pos[0] != '\0') {
2639                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2640                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2641                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2642                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2643                                 }
2644                         }
2645                         break;
2646                 case TK_A_EVENT_TIMEOUT:
2647                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2648                         break;
2649                 case TK_A_ATTR:
2650                         {
2651                                 const char *key_name = &rules->buf[cur->key.attr_off];
2652                                 char attr[UTIL_PATH_SIZE];
2653                                 char value[UTIL_NAME_SIZE];
2654                                 FILE *f;
2655
2656                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2657                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2658                                 attr_subst_subdir(attr, sizeof(attr));
2659
2660                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2661                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2662                                      &rules->buf[rule->rule.filename_off],
2663                                      rule->rule.filename_line);
2664                                 f = fopen(attr, "w");
2665                                 if (f != NULL) {
2666                                         if (fprintf(f, "%s", value) <= 0)
2667                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2668                                         fclose(f);
2669                                 } else {
2670                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2671                                 }
2672                                 break;
2673                         }
2674                 case TK_A_RUN:
2675                         {
2676                                 struct udev_list_entry *list_entry;
2677
2678                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2679                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2680                                 info(event->udev, "RUN '%s' %s:%u\n",
2681                                      &rules->buf[cur->key.value_off],
2682                                      &rules->buf[rule->rule.filename_off],
2683                                      rule->rule.filename_line);
2684                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2685                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2686                                 if (cur->key.fail_on_error)
2687                                         udev_list_entry_set_flags(list_entry, 1);
2688                                 break;
2689                         }
2690                 case TK_A_GOTO:
2691                         if (cur->key.rule_goto == 0)
2692                                 break;
2693                         cur = &rules->tokens[cur->key.rule_goto];
2694                         continue;
2695                 case TK_END:
2696                         return 0;
2697
2698                 case TK_M_PARENTS_MIN:
2699                 case TK_M_PARENTS_MAX:
2700                 case TK_M_MAX:
2701                 case TK_UNSET:
2702                         err(rules->udev, "wrong type %u\n", cur->type);
2703                         goto nomatch;
2704                 }
2705
2706                 cur++;
2707                 continue;
2708         nomatch:
2709                 /* fast-forward to next rule */
2710                 cur = rule + rule->rule.token_count;
2711                 dbg(rules->udev, "forward to rule: %u\n",
2712                                  (unsigned int) (cur - rules->tokens));
2713         }
2714 }
2715
2716 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2717 {
2718         struct token *cur;
2719         struct token *rule;
2720         uid_t uid = 0;
2721         gid_t gid = 0;
2722         mode_t mode = 0;
2723
2724         if (rules->tokens == NULL)
2725                 return;
2726
2727         cur = &rules->tokens[0];
2728         rule = cur;
2729         for (;;) {
2730                 switch (cur->type) {
2731                 case TK_RULE:
2732                         /* current rule */
2733                         rule = cur;
2734
2735                         /* skip rules without a static_node tag */
2736                         if (!rule->rule.has_static_node)
2737                                 goto next;
2738
2739                         uid = 0;
2740                         gid = 0;
2741                         mode = 0;
2742                         break;
2743                 case TK_A_OWNER_ID:
2744                         uid = cur->key.uid;
2745                         break;
2746                 case TK_A_GROUP_ID:
2747                         gid = cur->key.gid;
2748                         break;
2749                 case TK_A_MODE_ID:
2750                         mode = cur->key.mode;
2751                         break;
2752                 case TK_A_STATIC_NODE: {
2753                         char filename[UTIL_PATH_SIZE];
2754                         struct stat stats;
2755                         /* we assure, that the permissions tokens are sorted before the static token */
2756                         if (mode == 0 && uid == 0 && gid == 0)
2757                                 goto next;
2758                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2759                                       &rules->buf[cur->key.value_off], NULL);
2760                         if (stat(filename, &stats) != 0)
2761                                 goto next;
2762                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2763                                 goto next;
2764                         if (mode != 0 && mode != (stats.st_mode & 0777)) {
2765                                 chmod(filename, mode);
2766                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2767                         }
2768                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2769                                 chown(filename, uid, gid);
2770                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2771                         }
2772                         utimensat(AT_FDCWD, filename, NULL, 0);
2773                         break;
2774                 }
2775                 case TK_END:
2776                         return;
2777                 }
2778
2779                 cur++;
2780                 continue;
2781 next:
2782                 /* fast-forward to next rule */
2783                 cur = rule + rule->rule.token_count;
2784                 continue;
2785         }
2786 }