udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN                  2048
  36 #define PREALLOC_STRBUF                 32 * 1024
  37 #define PREALLOC_TRIE                   256
  38
  39 struct uid_gid {
  40         unsigned int name_off;
  41         union {
  42                 uid_t   uid;
  43                 gid_t   gid;
  44         };
  45 };
  46
  47 struct trie_node {
  48         /* this node's first child */
  49         unsigned int child_idx;
  50         /* the next child of our parent node's child list */
  51         unsigned int next_child_idx;
  52         /* this node's last child (shortcut for append) */
  53         unsigned int last_child_idx;
  54         unsigned int value_off;
  55         unsigned short value_len;
  56         unsigned char key;
  57 };
  58
  59 struct udev_rules {
  60         struct udev *udev;
  61         int resolve_names;
  62
  63         /* every key in the rules file becomes a token */
  64         struct token *tokens;
  65         unsigned int token_cur;
  66         unsigned int token_max;
  67
  68         /* all key strings are copied to a single string buffer */
  69         char *buf;
  70         size_t buf_cur;
  71         size_t buf_max;
  72         unsigned int buf_count;
  73
  74         /* during rule parsing, strings are indexed to find duplicates */
  75         struct trie_node *trie_nodes;
  76         unsigned int trie_nodes_cur;
  77         unsigned int trie_nodes_max;
  78
  79         /* during rule parsing, uid/gid lookup results are cached */
  80         struct uid_gid *uids;
  81         unsigned int uids_cur;
  82         unsigned int uids_max;
  83         struct uid_gid *gids;
  84         unsigned int gids_cur;
  85         unsigned int gids_max;
  86 };
  87
  88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  89 enum operation_type {
  90         OP_UNSET,
  91
  92         OP_MATCH,
  93         OP_NOMATCH,
  94         OP_MATCH_MAX,
  95
  96         OP_ADD,
  97         OP_ASSIGN,
  98         OP_ASSIGN_FINAL,
  99 };
 100
 101 enum string_glob_type {
 102         GL_UNSET,
 103         GL_PLAIN,                       /* no special chars */
 104         GL_GLOB,                        /* shell globs ?,*,[] */
 105         GL_SPLIT,                       /* multi-value A|B */
 106         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 107         GL_SOMETHING,                   /* commonly used "?*" */
 108 };
 109
 110 enum string_subst_type {
 111         SB_UNSET,
 112         SB_NONE,
 113         SB_FORMAT,
 114         SB_SUBSYS,
 115 };
 116
 117 /* tokens of a rule are sorted/handled in this order */
 118 enum token_type {
 119         TK_UNSET,
 120         TK_RULE,
 121
 122         TK_M_ACTION,                    /* val */
 123         TK_M_DEVPATH,                   /* val */
 124         TK_M_KERNEL,                    /* val */
 125         TK_M_DEVLINK,                   /* val */
 126         TK_M_NAME,                      /* val */
 127         TK_M_ENV,                       /* val, attr */
 128         TK_M_TAG,                       /* val */
 129         TK_M_SUBSYSTEM,                 /* val */
 130         TK_M_DRIVER,                    /* val */
 131         TK_M_WAITFOR,                   /* val */
 132         TK_M_ATTR,                      /* val, attr */
 133
 134         TK_M_PARENTS_MIN,
 135         TK_M_KERNELS,                   /* val */
 136         TK_M_SUBSYSTEMS,                /* val */
 137         TK_M_DRIVERS,                   /* val */
 138         TK_M_ATTRS,                     /* val, attr */
 139         TK_M_TAGS,                      /* val */
 140         TK_M_PARENTS_MAX,
 141
 142         TK_M_TEST,                      /* val, mode_t */
 143         TK_M_EVENT_TIMEOUT,             /* int */
 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_DB_PERSIST,
 156         TK_A_INOTIFY_WATCH,             /* int */
 157         TK_A_DEVLINK_PRIO,              /* int */
 158         TK_A_OWNER,                     /* val */
 159         TK_A_GROUP,                     /* val */
 160         TK_A_MODE,                      /* val */
 161         TK_A_OWNER_ID,                  /* uid_t */
 162         TK_A_GROUP_ID,                  /* gid_t */
 163         TK_A_MODE_ID,                   /* mode_t */
 164         TK_A_STATIC_NODE,               /* val */
 165         TK_A_ENV,                       /* val, attr */
 166         TK_A_TAG,                       /* val */
 167         TK_A_NAME,                      /* val */
 168         TK_A_DEVLINK,                   /* val */
 169         TK_A_ATTR,                      /* val, attr */
 170         TK_A_RUN,                       /* val, bool */
 171         TK_A_GOTO,                      /* size_t */
 172
 173         TK_END,
 174 };
 175
 176 /* we try to pack stuff in a way that we take only 12 bytes per token */
 177 struct token {
 178         union {
 179                 unsigned char type;             /* same in rule and key */
 180                 struct {
 181                         enum token_type type:8;
 182                         bool can_set_name:1;
 183                         bool has_static_node:1;
 184                         unsigned int unused:6;
 185                         unsigned short token_count;
 186                         unsigned int label_off;
 187                         unsigned short filename_off;
 188                         unsigned short filename_line;
 189                 } rule;
 190                 struct {
 191                         enum token_type type:8;
 192                         enum operation_type op:8;
 193                         enum string_glob_type glob:8;
 194                         enum string_subst_type subst:4;
 195                         enum string_subst_type attrsubst:4;
 196                         unsigned int value_off;
 197                         union {
 198                                 unsigned int attr_off;
 199                                 int devlink_unique;
 200                                 int fail_on_error;
 201                                 unsigned int rule_goto;
 202                                 mode_t  mode;
 203                                 uid_t uid;
 204                                 gid_t gid;
 205                                 int devlink_prio;
 206                                 int event_timeout;
 207                                 int watch;
 208                         };
 209                 } key;
 210         };
 211 };
 212
 213 #define MAX_TK          64
 214 struct rule_tmp {
 215         struct udev_rules *rules;
 216         struct token rule;
 217         struct token token[MAX_TK];
 218         unsigned int token_cur;
 219 };
 220
 221 #ifdef ENABLE_DEBUG
 222 static const char *operation_str(enum operation_type type)
 223 {
 224         static const char *operation_strs[] = {
 225                 [OP_UNSET] =            "UNSET",
 226                 [OP_MATCH] =            "match",
 227                 [OP_NOMATCH] =          "nomatch",
 228                 [OP_MATCH_MAX] =        "MATCH_MAX",
 229
 230                 [OP_ADD] =              "add",
 231                 [OP_ASSIGN] =           "assign",
 232                 [OP_ASSIGN_FINAL] =     "assign-final",
 233 }       ;
 234
 235         return operation_strs[type];
 236 }
 237
 238 static const char *string_glob_str(enum string_glob_type type)
 239 {
 240         static const char *string_glob_strs[] = {
 241                 [GL_UNSET] =            "UNSET",
 242                 [GL_PLAIN] =            "plain",
 243                 [GL_GLOB] =             "glob",
 244                 [GL_SPLIT] =            "split",
 245                 [GL_SPLIT_GLOB] =       "split-glob",
 246                 [GL_SOMETHING] =        "split-glob",
 247         };
 248
 249         return string_glob_strs[type];
 250 }
 251
 252 static const char *token_str(enum token_type type)
 253 {
 254         static const char *token_strs[] = {
 255                 [TK_UNSET] =                    "UNSET",
 256                 [TK_RULE] =                     "RULE",
 257
 258                 [TK_M_ACTION] =                 "M ACTION",
 259                 [TK_M_DEVPATH] =                "M DEVPATH",
 260                 [TK_M_KERNEL] =                 "M KERNEL",
 261                 [TK_M_DEVLINK] =                "M DEVLINK",
 262                 [TK_M_NAME] =                   "M NAME",
 263                 [TK_M_ENV] =                    "M ENV",
 264                 [TK_M_TAG] =                    "M TAG",
 265                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 266                 [TK_M_DRIVER] =                 "M DRIVER",
 267                 [TK_M_WAITFOR] =                "M WAITFOR",
 268                 [TK_M_ATTR] =                   "M ATTR",
 269
 270                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 271                 [TK_M_KERNELS] =                "M KERNELS",
 272                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 273                 [TK_M_DRIVERS] =                "M DRIVERS",
 274                 [TK_M_ATTRS] =                  "M ATTRS",
 275                 [TK_M_TAGS] =                   "M TAGS",
 276                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 277
 278                 [TK_M_TEST] =                   "M TEST",
 279                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 280                 [TK_M_PROGRAM] =                "M PROGRAM",
 281                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 282                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 283                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 284                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 285                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 286                 [TK_M_RESULT] =                 "M RESULT",
 287                 [TK_M_MAX] =                    "M MAX",
 288
 289                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 290                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 291                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 292                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 293                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 294                 [TK_A_OWNER] =                  "A OWNER",
 295                 [TK_A_GROUP] =                  "A GROUP",
 296                 [TK_A_MODE] =                   "A MODE",
 297                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 298                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 299                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 300                 [TK_A_MODE_ID] =                "A MODE_ID",
 301                 [TK_A_ENV] =                    "A ENV",
 302                 [TK_A_TAG] =                    "A ENV",
 303                 [TK_A_NAME] =                   "A NAME",
 304                 [TK_A_DEVLINK] =                "A DEVLINK",
 305                 [TK_A_ATTR] =                   "A ATTR",
 306                 [TK_A_RUN] =                    "A RUN",
 307                 [TK_A_GOTO] =                   "A GOTO",
 308
 309                 [TK_END] =                      "END",
 310         };
 311
 312         return token_strs[type];
 313 }
 314
 315 static void dump_token(struct udev_rules *rules, struct token *token)
 316 {
 317         enum token_type type = token->type;
 318         enum operation_type op = token->key.op;
 319         enum string_glob_type glob = token->key.glob;
 320         const char *value = &rules->buf[token->key.value_off];
 321         const char *attr = &rules->buf[token->key.attr_off];
 322
 323         switch (type) {
 324         case TK_RULE:
 325                 {
 326                         const char *tks_ptr = (char *)rules->tokens;
 327                         const char *tk_ptr = (char *)token;
 328                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 329
 330                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 331                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 332                             idx, token->rule.token_count,
 333                             &rules->buf[token->rule.label_off]);
 334                         break;
 335                 }
 336         case TK_M_ACTION:
 337         case TK_M_DEVPATH:
 338         case TK_M_KERNEL:
 339         case TK_M_SUBSYSTEM:
 340         case TK_M_DRIVER:
 341         case TK_M_WAITFOR:
 342         case TK_M_DEVLINK:
 343         case TK_M_NAME:
 344         case TK_M_KERNELS:
 345         case TK_M_SUBSYSTEMS:
 346         case TK_M_DRIVERS:
 347         case TK_M_TAGS:
 348         case TK_M_PROGRAM:
 349         case TK_M_IMPORT_FILE:
 350         case TK_M_IMPORT_PROG:
 351         case TK_M_IMPORT_DB:
 352         case TK_M_IMPORT_CMDLINE:
 353         case TK_M_IMPORT_PARENT:
 354         case TK_M_RESULT:
 355         case TK_A_NAME:
 356         case TK_A_DEVLINK:
 357         case TK_A_OWNER:
 358         case TK_A_GROUP:
 359         case TK_A_MODE:
 360         case TK_A_RUN:
 361                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 362                     token_str(type), operation_str(op), value, string_glob_str(glob));
 363                 break;
 364         case TK_M_ATTR:
 365         case TK_M_ATTRS:
 366         case TK_M_ENV:
 367         case TK_A_ATTR:
 368         case TK_A_ENV:
 369                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 370                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 371                 break;
 372         case TK_M_TAG:
 373         case TK_A_TAG:
 374                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 375                 break;
 376         case TK_A_STRING_ESCAPE_NONE:
 377         case TK_A_STRING_ESCAPE_REPLACE:
 378         case TK_A_DB_PERSIST:
 379                 dbg(rules->udev, "%s\n", token_str(type));
 380                 break;
 381         case TK_M_TEST:
 382                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 383                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 384                 break;
 385         case TK_A_INOTIFY_WATCH:
 386                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 387                 break;
 388         case TK_A_DEVLINK_PRIO:
 389                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 390                 break;
 391         case TK_A_OWNER_ID:
 392                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 393                 break;
 394         case TK_A_GROUP_ID:
 395                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 396                 break;
 397         case TK_A_MODE_ID:
 398                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 399                 break;
 400         case TK_A_STATIC_NODE:
 401                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 402                 break;
 403         case TK_M_EVENT_TIMEOUT:
 404                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 405                 break;
 406         case TK_A_GOTO:
 407                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 408                 break;
 409         case TK_END:
 410                 dbg(rules->udev, "* %s\n", token_str(type));
 411                 break;
 412         case TK_M_PARENTS_MIN:
 413         case TK_M_PARENTS_MAX:
 414         case TK_M_MAX:
 415         case TK_UNSET:
 416                 dbg(rules->udev, "unknown type %u\n", type);
 417                 break;
 418         }
 419 }
 420
 421 static void dump_rules(struct udev_rules *rules)
 422 {
 423         unsigned int i;
 424
 425         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 426             rules->token_cur,
 427             rules->token_cur * sizeof(struct token),
 428             rules->buf_count,
 429             rules->buf_cur);
 430         for(i = 0; i < rules->token_cur; i++)
 431                 dump_token(rules, &rules->tokens[i]);
 432 }
 433 #else
 434 static inline const char *operation_str(enum operation_type type) { return NULL; }
 435 static inline const char *token_str(enum token_type type) { return NULL; }
 436 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 437 static inline void dump_rules(struct udev_rules *rules) {}
 438 #endif /* ENABLE_DEBUG */
 439
 440 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 441 {
 442         int off;
 443
 444         /* grow buffer if needed */
 445         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 446                 char *buf;
 447                 unsigned int add;
 448
 449                 /* double the buffer size */
 450                 add = rules->buf_max;
 451                 if (add < bytes * 8)
 452                         add = bytes * 8;
 453
 454                 buf = realloc(rules->buf, rules->buf_max + add);
 455                 if (buf == NULL)
 456                         return -1;
 457                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 458                 rules->buf = buf;
 459                 rules->buf_max += add;
 460         }
 461         off = rules->buf_cur;
 462         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 463         rules->buf_cur += bytes;
 464         rules->buf_count++;
 465         return off;
 466 }
 467
 468 static int add_string(struct udev_rules *rules, const char *str)
 469 {
 470         unsigned int node_idx;
 471         struct trie_node *new_node;
 472         unsigned int new_node_idx;
 473         unsigned char key;
 474         unsigned short len;
 475         unsigned int depth;
 476         unsigned int off;
 477         struct trie_node *parent;
 478
 479         /* walk trie, start from last character of str to find matching tails */
 480         len = strlen(str);
 481         key = str[len-1];
 482         node_idx = 0;
 483         for (depth = 0; depth <= len; depth++) {
 484                 struct trie_node *node;
 485                 unsigned int child_idx;
 486
 487                 node = &rules->trie_nodes[node_idx];
 488                 off = node->value_off + node->value_len - len;
 489
 490                 /* match against current node */
 491                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 492                         return off;
 493
 494                 /* lookup child node */
 495                 key = str[len - 1 - depth];
 496                 child_idx = node->child_idx;
 497                 while (child_idx > 0) {
 498                         struct trie_node *child;
 499
 500                         child = &rules->trie_nodes[child_idx];
 501                         if (child->key == key)
 502                                 break;
 503                         child_idx = child->next_child_idx;
 504                 }
 505                 if (child_idx == 0)
 506                         break;
 507                 node_idx = child_idx;
 508         }
 509
 510         /* string not found, add it */
 511         off = add_new_string(rules, str, len + 1);
 512
 513         /* grow trie nodes if needed */
 514         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 515                 struct trie_node *nodes;
 516                 unsigned int add;
 517
 518                 /* double the buffer size */
 519                 add = rules->trie_nodes_max;
 520                 if (add < 8)
 521                         add = 8;
 522
 523                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 524                 if (nodes == NULL)
 525                         return -1;
 526                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 527                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 528                 rules->trie_nodes = nodes;
 529                 rules->trie_nodes_max += add;
 530         }
 531
 532         /* get a new node */
 533         new_node_idx = rules->trie_nodes_cur;
 534         rules->trie_nodes_cur++;
 535         new_node = &rules->trie_nodes[new_node_idx];
 536         memset(new_node, 0x00, sizeof(struct trie_node));
 537         new_node->value_off = off;
 538         new_node->value_len = len;
 539         new_node->key = key;
 540
 541         /* join the parent's child list */
 542         parent = &rules->trie_nodes[node_idx];
 543         if (parent->child_idx == 0) {
 544                 parent->child_idx = new_node_idx;
 545         } else {
 546                 struct trie_node *last_child;
 547
 548                 last_child = &rules->trie_nodes[parent->last_child_idx];
 549                 last_child->next_child_idx = new_node_idx;
 550         }
 551         parent->last_child_idx = new_node_idx;
 552         return off;
 553 }
 554
 555 static int add_token(struct udev_rules *rules, struct token *token)
 556 {
 557         /* grow buffer if needed */
 558         if (rules->token_cur+1 >= rules->token_max) {
 559                 struct token *tokens;
 560                 unsigned int add;
 561
 562                 /* double the buffer size */
 563                 add = rules->token_max;
 564                 if (add < 8)
 565                         add = 8;
 566
 567                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 568                 if (tokens == NULL)
 569                         return -1;
 570                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 571                 rules->tokens = tokens;
 572                 rules->token_max += add;
 573         }
 574         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 575         rules->token_cur++;
 576         return 0;
 577 }
 578
 579 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 580 {
 581         unsigned int i;
 582         uid_t uid;
 583         unsigned int off;
 584
 585         /* lookup, if we know it already */
 586         for (i = 0; i < rules->uids_cur; i++) {
 587                 off = rules->uids[i].name_off;
 588                 if (strcmp(&rules->buf[off], owner) == 0) {
 589                         uid = rules->uids[i].uid;
 590                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 591                         return uid;
 592                 }
 593         }
 594         uid = util_lookup_user(rules->udev, owner);
 595
 596         /* grow buffer if needed */
 597         if (rules->uids_cur+1 >= rules->uids_max) {
 598                 struct uid_gid *uids;
 599                 unsigned int add;
 600
 601                 /* double the buffer size */
 602                 add = rules->uids_max;
 603                 if (add < 1)
 604                         add = 8;
 605
 606                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 607                 if (uids == NULL)
 608                         return uid;
 609                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 610                 rules->uids = uids;
 611                 rules->uids_max += add;
 612         }
 613         rules->uids[rules->uids_cur].uid = uid;
 614         off = add_string(rules, owner);
 615         if (off <= 0)
 616                 return uid;
 617         rules->uids[rules->uids_cur].name_off = off;
 618         rules->uids_cur++;
 619         return uid;
 620 }
 621
 622 static gid_t add_gid(struct udev_rules *rules, const char *group)
 623 {
 624         unsigned int i;
 625         gid_t gid;
 626         unsigned int off;
 627
 628         /* lookup, if we know it already */
 629         for (i = 0; i < rules->gids_cur; i++) {
 630                 off = rules->gids[i].name_off;
 631                 if (strcmp(&rules->buf[off], group) == 0) {
 632                         gid = rules->gids[i].gid;
 633                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 634                         return gid;
 635                 }
 636         }
 637         gid = util_lookup_group(rules->udev, group);
 638
 639         /* grow buffer if needed */
 640         if (rules->gids_cur+1 >= rules->gids_max) {
 641                 struct uid_gid *gids;
 642                 unsigned int add;
 643
 644                 /* double the buffer size */
 645                 add = rules->gids_max;
 646                 if (add < 1)
 647                         add = 8;
 648
 649                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 650                 if (gids == NULL)
 651                         return gid;
 652                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 653                 rules->gids = gids;
 654                 rules->gids_max += add;
 655         }
 656         rules->gids[rules->gids_cur].gid = gid;
 657         off = add_string(rules, group);
 658         if (off <= 0)
 659                 return gid;
 660         rules->gids[rules->gids_cur].name_off = off;
 661         rules->gids_cur++;
 662         return gid;
 663 }
 664
 665 static int import_property_from_string(struct udev_device *dev, char *line)
 666 {
 667         struct udev *udev = udev_device_get_udev(dev);
 668         char *key;
 669         char *val;
 670         size_t len;
 671
 672         /* find key */
 673         key = line;
 674         while (isspace(key[0]))
 675                 key++;
 676
 677         /* comment or empty line */
 678         if (key[0] == '#' || key[0] == '\0')
 679                 return -1;
 680
 681         /* split key/value */
 682         val = strchr(key, '=');
 683         if (val == NULL)
 684                 return -1;
 685         val[0] = '\0';
 686         val++;
 687
 688         /* find value */
 689         while (isspace(val[0]))
 690                 val++;
 691
 692         /* terminate key */
 693         len = strlen(key);
 694         if (len == 0)
 695                 return -1;
 696         while (isspace(key[len-1]))
 697                 len--;
 698         key[len] = '\0';
 699
 700         /* terminate value */
 701         len = strlen(val);
 702         if (len == 0)
 703                 return -1;
 704         while (isspace(val[len-1]))
 705                 len--;
 706         val[len] = '\0';
 707
 708         if (len == 0)
 709                 return -1;
 710
 711         /* unquote */
 712         if (val[0] == '"' || val[0] == '\'') {
 713                 if (val[len-1] != val[0]) {
 714                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 715                         return -1;
 716                 }
 717                 val[len-1] = '\0';
 718                 val++;
 719         }
 720
 721         dbg(udev, "adding '%s'='%s'\n", key, val);
 722
 723         /* handle device, renamed by external tool, returning new path */
 724         if (strcmp(key, "DEVPATH") == 0) {
 725                 char syspath[UTIL_PATH_SIZE];
 726
 727                 info(udev, "updating devpath from '%s' to '%s'\n",
 728                      udev_device_get_devpath(dev), val);
 729                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 730                 udev_device_set_syspath(dev, syspath);
 731         } else {
 732                 struct udev_list_entry *entry;
 733
 734                 entry = udev_device_add_property(dev, key, val);
 735                 /* store in db, skip private keys */
 736                 if (key[0] != '.')
 737                         udev_list_entry_set_num(entry, true);
 738         }
 739         return 0;
 740 }
 741
 742 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 743 {
 744         FILE *f;
 745         char line[UTIL_LINE_SIZE];
 746
 747         f = fopen(filename, "r");
 748         if (f == NULL)
 749                 return -1;
 750         while (fgets(line, sizeof(line), f) != NULL)
 751                 import_property_from_string(dev, line);
 752         fclose(f);
 753         return 0;
 754 }
 755
 756 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 757 {
 758         struct udev_device *dev = event->dev;
 759         char **envp;
 760         char result[UTIL_LINE_SIZE];
 761         char *line;
 762         int err;
 763
 764         envp = udev_device_get_properties_envp(dev);
 765         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 766         if (err < 0)
 767                 return err;
 768
 769         line = result;
 770         while (line != NULL) {
 771                 char *pos;
 772
 773                 pos = strchr(line, '\n');
 774                 if (pos != NULL) {
 775                         pos[0] = '\0';
 776                         pos = &pos[1];
 777                 }
 778                 import_property_from_string(dev, line);
 779                 line = pos;
 780         }
 781         return 0;
 782 }
 783
 784 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 785 {
 786         struct udev *udev = udev_device_get_udev(dev);
 787         struct udev_device *dev_parent;
 788         struct udev_list_entry *list_entry;
 789
 790         dev_parent = udev_device_get_parent(dev);
 791         if (dev_parent == NULL)
 792                 return -1;
 793
 794         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 795         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 796                 const char *key = udev_list_entry_get_name(list_entry);
 797                 const char *val = udev_list_entry_get_value(list_entry);
 798
 799                 if (fnmatch(filter, key, 0) == 0) {
 800                         struct udev_list_entry *entry;
 801
 802                         dbg(udev, "import key '%s=%s'\n", key, val);
 803                         entry = udev_device_add_property(dev, key, val);
 804                         /* store in db, skip private keys */
 805                         if (key[0] != '.')
 806                                 udev_list_entry_set_num(entry, true);
 807                 }
 808         }
 809         return 0;
 810 }
 811
 812 #define WAIT_LOOP_PER_SECOND            50
 813 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 814 {
 815         struct udev *udev = udev_device_get_udev(dev);
 816         char filepath[UTIL_PATH_SIZE];
 817         char devicepath[UTIL_PATH_SIZE];
 818         struct stat stats;
 819         int loop = timeout * WAIT_LOOP_PER_SECOND;
 820
 821         /* a relative path is a device attribute */
 822         devicepath[0] = '\0';
 823         if (file[0] != '/') {
 824                 util_strscpyl(devicepath, sizeof(devicepath),
 825                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 826                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 827                 file = filepath;
 828         }
 829
 830         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 831         while (--loop) {
 832                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 833
 834                 /* lookup file */
 835                 if (stat(file, &stats) == 0) {
 836                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 837                         return 0;
 838                 }
 839                 /* make sure, the device did not disappear in the meantime */
 840                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 841                         info(udev, "device disappeared while waiting for '%s'\n", file);
 842                         return -2;
 843                 }
 844                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 845                 nanosleep(&duration, NULL);
 846         }
 847         info(udev, "waiting for '%s' failed\n", file);
 848         return -1;
 849 }
 850
 851 static int attr_subst_subdir(char *attr, size_t len)
 852 {
 853         bool found = false;
 854
 855         if (strstr(attr, "/*/")) {
 856                 char *pos;
 857                 char dirname[UTIL_PATH_SIZE];
 858                 const char *tail;
 859                 DIR *dir;
 860
 861                 util_strscpy(dirname, sizeof(dirname), attr);
 862                 pos = strstr(dirname, "/*/");
 863                 if (pos == NULL)
 864                         return -1;
 865                 pos[0] = '\0';
 866                 tail = &pos[2];
 867                 dir = opendir(dirname);
 868                 if (dir != NULL) {
 869                         struct dirent *dent;
 870
 871                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 872                                 struct stat stats;
 873
 874                                 if (dent->d_name[0] == '.')
 875                                         continue;
 876                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 877                                 if (stat(attr, &stats) == 0) {
 878                                         found = true;
 879                                         break;
 880                                 }
 881                         }
 882                         closedir(dir);
 883                 }
 884         }
 885
 886         return found;
 887 }
 888
 889 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 890 {
 891         char *linepos;
 892         char *temp;
 893
 894         linepos = *line;
 895         if (linepos == NULL || linepos[0] == '\0')
 896                 return -1;
 897
 898         /* skip whitespace */
 899         while (isspace(linepos[0]) || linepos[0] == ',')
 900                 linepos++;
 901
 902         /* get the key */
 903         if (linepos[0] == '\0')
 904                 return -1;
 905         *key = linepos;
 906
 907         for (;;) {
 908                 linepos++;
 909                 if (linepos[0] == '\0')
 910                         return -1;
 911                 if (isspace(linepos[0]))
 912                         break;
 913                 if (linepos[0] == '=')
 914                         break;
 915                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 916                         if (linepos[1] == '=')
 917                                 break;
 918         }
 919
 920         /* remember end of key */
 921         temp = linepos;
 922
 923         /* skip whitespace after key */
 924         while (isspace(linepos[0]))
 925                 linepos++;
 926         if (linepos[0] == '\0')
 927                 return -1;
 928
 929         /* get operation type */
 930         if (linepos[0] == '=' && linepos[1] == '=') {
 931                 *op = OP_MATCH;
 932                 linepos += 2;
 933         } else if (linepos[0] == '!' && linepos[1] == '=') {
 934                 *op = OP_NOMATCH;
 935                 linepos += 2;
 936         } else if (linepos[0] == '+' && linepos[1] == '=') {
 937                 *op = OP_ADD;
 938                 linepos += 2;
 939         } else if (linepos[0] == '=') {
 940                 *op = OP_ASSIGN;
 941                 linepos++;
 942         } else if (linepos[0] == ':' && linepos[1] == '=') {
 943                 *op = OP_ASSIGN_FINAL;
 944                 linepos += 2;
 945         } else
 946                 return -1;
 947
 948         /* terminate key */
 949         temp[0] = '\0';
 950
 951         /* skip whitespace after operator */
 952         while (isspace(linepos[0]))
 953                 linepos++;
 954         if (linepos[0] == '\0')
 955                 return -1;
 956
 957         /* get the value */
 958         if (linepos[0] == '"')
 959                 linepos++;
 960         else
 961                 return -1;
 962         *value = linepos;
 963
 964         /* terminate */
 965         temp = strchr(linepos, '"');
 966         if (!temp)
 967                 return -1;
 968         temp[0] = '\0';
 969         temp++;
 970         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 971
 972         /* move line to next key */
 973         *line = temp;
 974         return 0;
 975 }
 976
 977 /* extract possible KEY{attr} */
 978 static char *get_key_attribute(struct udev *udev, char *str)
 979 {
 980         char *pos;
 981         char *attr;
 982
 983         attr = strchr(str, '{');
 984         if (attr != NULL) {
 985                 attr++;
 986                 pos = strchr(attr, '}');
 987                 if (pos == NULL) {
 988                         err(udev, "missing closing brace for format\n");
 989                         return NULL;
 990                 }
 991                 pos[0] = '\0';
 992                 dbg(udev, "attribute='%s'\n", attr);
 993                 return attr;
 994         }
 995         return NULL;
 996 }
 997
 998 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 999                         enum operation_type op,
1000                         const char *value, const void *data)
1001 {
1002         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
1003         const char *attr = NULL;
1004
1005         memset(token, 0x00, sizeof(struct token));
1006
1007         switch (type) {
1008         case TK_M_ACTION:
1009         case TK_M_DEVPATH:
1010         case TK_M_KERNEL:
1011         case TK_M_SUBSYSTEM:
1012         case TK_M_DRIVER:
1013         case TK_M_WAITFOR:
1014         case TK_M_DEVLINK:
1015         case TK_M_NAME:
1016         case TK_M_KERNELS:
1017         case TK_M_SUBSYSTEMS:
1018         case TK_M_DRIVERS:
1019         case TK_M_TAGS:
1020         case TK_M_PROGRAM:
1021         case TK_M_IMPORT_FILE:
1022         case TK_M_IMPORT_PROG:
1023         case TK_M_IMPORT_DB:
1024         case TK_M_IMPORT_CMDLINE:
1025         case TK_M_IMPORT_PARENT:
1026         case TK_M_RESULT:
1027         case TK_A_OWNER:
1028         case TK_A_GROUP:
1029         case TK_A_MODE:
1030         case TK_A_NAME:
1031         case TK_A_GOTO:
1032         case TK_M_TAG:
1033         case TK_A_TAG:
1034                 token->key.value_off = add_string(rule_tmp->rules, value);
1035                 break;
1036         case TK_M_ENV:
1037         case TK_M_ATTR:
1038         case TK_M_ATTRS:
1039         case TK_A_ATTR:
1040         case TK_A_ENV:
1041                 attr = data;
1042                 token->key.value_off = add_string(rule_tmp->rules, value);
1043                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1044                 break;
1045         case TK_A_DEVLINK:
1046                 token->key.value_off = add_string(rule_tmp->rules, value);
1047                 token->key.devlink_unique = *(int *)data;
1048                 break;
1049         case TK_M_TEST:
1050                 token->key.value_off = add_string(rule_tmp->rules, value);
1051                 if (data != NULL)
1052                         token->key.mode = *(mode_t *)data;
1053                 break;
1054         case TK_A_STRING_ESCAPE_NONE:
1055         case TK_A_STRING_ESCAPE_REPLACE:
1056         case TK_A_DB_PERSIST:
1057                 break;
1058         case TK_A_RUN:
1059                 token->key.value_off = add_string(rule_tmp->rules, value);
1060                 token->key.fail_on_error = *(int *)data;
1061                 break;
1062         case TK_A_INOTIFY_WATCH:
1063         case TK_A_DEVLINK_PRIO:
1064                 token->key.devlink_prio = *(int *)data;
1065                 break;
1066         case TK_A_OWNER_ID:
1067                 token->key.uid = *(uid_t *)data;
1068                 break;
1069         case TK_A_GROUP_ID:
1070                 token->key.gid = *(gid_t *)data;
1071                 break;
1072         case TK_A_MODE_ID:
1073                 token->key.mode = *(mode_t *)data;
1074                 break;
1075         case TK_A_STATIC_NODE:
1076                 token->key.value_off = add_string(rule_tmp->rules, value);
1077                 break;
1078         case TK_M_EVENT_TIMEOUT:
1079                 token->key.event_timeout = *(int *)data;
1080                 break;
1081         case TK_RULE:
1082         case TK_M_PARENTS_MIN:
1083         case TK_M_PARENTS_MAX:
1084         case TK_M_MAX:
1085         case TK_END:
1086         case TK_UNSET:
1087                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1088                 return -1;
1089         }
1090
1091         if (value != NULL && type < TK_M_MAX) {
1092                 /* check if we need to split or call fnmatch() while matching rules */
1093                 enum string_glob_type glob;
1094                 int has_split;
1095                 int has_glob;
1096
1097                 has_split = (strchr(value, '|') != NULL);
1098                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1099                 if (has_split && has_glob) {
1100                         glob = GL_SPLIT_GLOB;
1101                 } else if (has_split) {
1102                         glob = GL_SPLIT;
1103                 } else if (has_glob) {
1104                         if (strcmp(value, "?*") == 0)
1105                                 glob = GL_SOMETHING;
1106                         else
1107                                 glob = GL_GLOB;
1108                 } else {
1109                         glob = GL_PLAIN;
1110                 }
1111                 token->key.glob = glob;
1112         }
1113
1114         if (value != NULL && type > TK_M_MAX) {
1115                 /* check if assigned value has substitution chars */
1116                 if (value[0] == '[')
1117                         token->key.subst = SB_SUBSYS;
1118                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1119                         token->key.subst = SB_FORMAT;
1120                 else
1121                         token->key.subst = SB_NONE;
1122         }
1123
1124         if (attr != NULL) {
1125                 /* check if property/attribut name has substitution chars */
1126                 if (attr[0] == '[')
1127                         token->key.attrsubst = SB_SUBSYS;
1128                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1129                         token->key.attrsubst = SB_FORMAT;
1130                 else
1131                         token->key.attrsubst = SB_NONE;
1132         }
1133
1134         token->key.type = type;
1135         token->key.op = op;
1136         rule_tmp->token_cur++;
1137         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1138                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1139                 return -1;
1140         }
1141         return 0;
1142 }
1143
1144 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1145 {
1146         unsigned int i;
1147         unsigned int start = 0;
1148         unsigned int end = rule_tmp->token_cur;
1149
1150         for (i = 0; i < rule_tmp->token_cur; i++) {
1151                 enum token_type next_val = TK_UNSET;
1152                 unsigned int next_idx = 0;
1153                 unsigned int j;
1154
1155                 /* find smallest value */
1156                 for (j = start; j < end; j++) {
1157                         if (rule_tmp->token[j].type == TK_UNSET)
1158                                 continue;
1159                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1160                                 next_val = rule_tmp->token[j].type;
1161                                 next_idx = j;
1162                         }
1163                 }
1164
1165                 /* add token and mark done */
1166                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1167                         return -1;
1168                 rule_tmp->token[next_idx].type = TK_UNSET;
1169
1170                 /* shrink range */
1171                 if (next_idx == start)
1172                         start++;
1173                 if (next_idx+1 == end)
1174                         end--;
1175         }
1176         return 0;
1177 }
1178
1179 static int add_rule(struct udev_rules *rules, char *line,
1180                     const char *filename, unsigned int filename_off, unsigned int lineno)
1181 {
1182         char *linepos;
1183         char *attr;
1184         struct rule_tmp rule_tmp;
1185         bool bus_warn = false;
1186         bool sysfs_warn = false;
1187         bool id_warn = false;
1188
1189         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1190         rule_tmp.rules = rules;
1191         rule_tmp.rule.type = TK_RULE;
1192         rule_tmp.rule.rule.filename_off = filename_off;
1193         rule_tmp.rule.rule.filename_line = lineno;
1194
1195         linepos = line;
1196         for (;;) {
1197                 char *key;
1198                 char *value;
1199                 enum operation_type op;
1200
1201                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1202                         break;
1203
1204                 if (strcmp(key, "ACTION") == 0) {
1205                         if (op > OP_MATCH_MAX) {
1206                                 err(rules->udev, "invalid ACTION operation\n");
1207                                 goto invalid;
1208                         }
1209                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1210                         continue;
1211                 }
1212
1213                 if (strcmp(key, "DEVPATH") == 0) {
1214                         if (op > OP_MATCH_MAX) {
1215                                 err(rules->udev, "invalid DEVPATH operation\n");
1216                                 goto invalid;
1217                         }
1218                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1219                         continue;
1220                 }
1221
1222                 if (strcmp(key, "KERNEL") == 0) {
1223                         if (op > OP_MATCH_MAX) {
1224                                 err(rules->udev, "invalid KERNEL operation\n");
1225                                 goto invalid;
1226                         }
1227                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1228                         continue;
1229                 }
1230
1231                 if (strcmp(key, "SUBSYSTEM") == 0) {
1232                         if (op > OP_MATCH_MAX) {
1233                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1234                                 goto invalid;
1235                         }
1236                         /* bus, class, subsystem events should all be the same */
1237                         if (strcmp(value, "subsystem") == 0 ||
1238                             strcmp(value, "bus") == 0 ||
1239                             strcmp(value, "class") == 0) {
1240                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1241                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1242                                             "please fix it in %s:%u", value, filename, lineno);
1243                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1244                         } else
1245                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1246                         continue;
1247                 }
1248
1249                 if (strcmp(key, "DRIVER") == 0) {
1250                         if (op > OP_MATCH_MAX) {
1251                                 err(rules->udev, "invalid DRIVER operation\n");
1252                                 goto invalid;
1253                         }
1254                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1255                         continue;
1256                 }
1257
1258                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1259                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1260                         if (attr == NULL) {
1261                                 err(rules->udev, "error parsing ATTR attribute\n");
1262                                 goto invalid;
1263                         }
1264                         if (op < OP_MATCH_MAX) {
1265                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1266                         } else {
1267                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1268                         }
1269                         continue;
1270                 }
1271
1272                 if (strcmp(key, "KERNELS") == 0) {
1273                         if (op > OP_MATCH_MAX) {
1274                                 err(rules->udev, "invalid KERNELS operation\n");
1275                                 goto invalid;
1276                         }
1277                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1278                         continue;
1279                 }
1280
1281                 if (strcmp(key, "ID") == 0) {
1282                         if (!id_warn) {
1283                                 id_warn = true;
1284                                 err(rules->udev, "ID= will be removed in a future udev version, "
1285                                     "please use KERNEL= to match the event device, or KERNELS= "
1286                                     "to match a parent device, in %s:%u\n", filename, lineno);
1287                         }
1288                         if (op > OP_MATCH_MAX) {
1289                                 err(rules->udev, "invalid KERNELS operation\n");
1290                                 goto invalid;
1291                         }
1292                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1293                         continue;
1294                 }
1295
1296                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1297                         if (op > OP_MATCH_MAX) {
1298                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1299                                 goto invalid;
1300                         }
1301                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1302                         continue;
1303                 }
1304
1305                 if (strcmp(key, "BUS") == 0) {
1306                         if (!bus_warn) {
1307                                 bus_warn = true;
1308                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1309                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1310                                     "to match a parent device, in %s:%u\n", filename, lineno);
1311                         }
1312                         if (op > OP_MATCH_MAX) {
1313                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1314                                 goto invalid;
1315                         }
1316                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1317                         continue;
1318                 }
1319
1320                 if (strcmp(key, "DRIVERS") == 0) {
1321                         if (op > OP_MATCH_MAX) {
1322                                 err(rules->udev, "invalid DRIVERS operation\n");
1323                                 goto invalid;
1324                         }
1325                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1326                         continue;
1327                 }
1328
1329                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1330                         if (op > OP_MATCH_MAX) {
1331                                 err(rules->udev, "invalid ATTRS operation\n");
1332                                 goto invalid;
1333                         }
1334                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1335                         if (attr == NULL) {
1336                                 err(rules->udev, "error parsing ATTRS attribute\n");
1337                                 goto invalid;
1338                         }
1339                         if (strncmp(attr, "device/", 7) == 0)
1340                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1341                                     "please fix it in %s:%u", filename, lineno);
1342                         else if (strstr(attr, "../") != NULL)
1343                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1344                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1345                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1346                         continue;
1347                 }
1348
1349                 if (strcmp(key, "TAGS") == 0) {
1350                         if (op > OP_MATCH_MAX) {
1351                                 err(rules->udev, "invalid TAGS operation\n");
1352                                 goto invalid;
1353                         }
1354                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1355                         continue;
1356                 }
1357
1358                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1359                         if (!sysfs_warn) {
1360                                 sysfs_warn = true;
1361                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1362                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1363                                     "to match a parent device, in %s:%u\n", filename, lineno);
1364                         }
1365                         if (op > OP_MATCH_MAX) {
1366                                 err(rules->udev, "invalid ATTRS operation\n");
1367                                 goto invalid;
1368                         }
1369                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1370                         if (attr == NULL) {
1371                                 err(rules->udev, "error parsing ATTRS attribute\n");
1372                                 goto invalid;
1373                         }
1374                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1375                         continue;
1376                 }
1377
1378                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1379                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1380                         if (attr == NULL) {
1381                                 err(rules->udev, "error parsing ENV attribute\n");
1382                                 goto invalid;
1383                         }
1384                         if (op < OP_MATCH_MAX) {
1385                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1386                                         goto invalid;
1387                         } else {
1388                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1389                                         goto invalid;
1390                         }
1391                         continue;
1392                 }
1393
1394                 if (strcmp(key, "TAG") == 0) {
1395                         if (op < OP_MATCH_MAX)
1396                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1397                         else
1398                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1399                         continue;
1400                 }
1401
1402                 if (strcmp(key, "PROGRAM") == 0) {
1403                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1404                         continue;
1405                 }
1406
1407                 if (strcmp(key, "RESULT") == 0) {
1408                         if (op > OP_MATCH_MAX) {
1409                                 err(rules->udev, "invalid RESULT operation\n");
1410                                 goto invalid;
1411                         }
1412                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1413                         continue;
1414                 }
1415
1416                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1417                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1418                         if (attr != NULL && strstr(attr, "program")) {
1419                                 dbg(rules->udev, "IMPORT will be executed\n");
1420                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1421                         } else if (attr != NULL && strstr(attr, "file")) {
1422                                 dbg(rules->udev, "IMPORT will be included as file\n");
1423                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1424                         } else if (attr != NULL && strstr(attr, "db")) {
1425                                 dbg(rules->udev, "IMPORT will include db values\n");
1426                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1427                         } else if (attr != NULL && strstr(attr, "cmdline")) {
1428                                 dbg(rules->udev, "IMPORT will include db values\n");
1429                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1430                         } else if (attr != NULL && strstr(attr, "parent")) {
1431                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1432                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1433                         } else {
1434                                 /* figure it out if it is executable */
1435                                 char file[UTIL_PATH_SIZE];
1436                                 char *pos;
1437                                 struct stat statbuf;
1438
1439                                 /* allow programs in /lib/udev called without the path */
1440                                 if (value[0] != '/')
1441                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1442                                 else
1443                                         util_strscpy(file, sizeof(file), value);
1444                                 pos = strchr(file, ' ');
1445                                 if (pos)
1446                                         pos[0] = '\0';
1447                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1448                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1449                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1450                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1451                                 } else {
1452                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1453                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1454                                 }
1455                         }
1456                         continue;
1457                 }
1458
1459                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1460                         mode_t mode = 0;
1461
1462                         if (op > OP_MATCH_MAX) {
1463                                 err(rules->udev, "invalid TEST operation\n");
1464                                 goto invalid;
1465                         }
1466                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1467                         if (attr != NULL) {
1468                                 mode = strtol(attr, NULL, 8);
1469                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1470                         } else {
1471                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1472                         }
1473                         continue;
1474                 }
1475
1476                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1477                         int flag = 0;
1478
1479                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1480                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1481                                 flag = 1;
1482                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1483                         continue;
1484                 }
1485
1486                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1487                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1488                         continue;
1489                 }
1490
1491                 if (strcmp(key, "LABEL") == 0) {
1492                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1493                         continue;
1494                 }
1495
1496                 if (strcmp(key, "GOTO") == 0) {
1497                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1498                         continue;
1499                 }
1500
1501                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1502                         if (op < OP_MATCH_MAX) {
1503                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1504                         } else {
1505                                 if (strcmp(value, "%k") == 0) {
1506                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1507                                             "please remove it from %s:%u\n", filename, lineno);
1508                                         continue;
1509                                 }
1510                                 if (value[0] == '\0') {
1511                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1512                                              "please remove it from %s:%u\n", filename, lineno);
1513                                         continue;
1514                                 }
1515                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1516                         }
1517                         rule_tmp.rule.rule.can_set_name = true;
1518                         continue;
1519                 }
1520
1521                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1522                         if (op < OP_MATCH_MAX) {
1523                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1524                         } else {
1525                                 int flag = 0;
1526
1527                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1528                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1529                                         flag = 1;
1530                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1531                         }
1532                         rule_tmp.rule.rule.can_set_name = true;
1533                         continue;
1534                 }
1535
1536                 if (strcmp(key, "OWNER") == 0) {
1537                         uid_t uid;
1538                         char *endptr;
1539
1540                         uid = strtoul(value, &endptr, 10);
1541                         if (endptr[0] == '\0') {
1542                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1543                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1544                                 uid = add_uid(rules, value);
1545                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1546                         } else if (rules->resolve_names >= 0) {
1547                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1548                         }
1549                         rule_tmp.rule.rule.can_set_name = true;
1550                         continue;
1551                 }
1552
1553                 if (strcmp(key, "GROUP") == 0) {
1554                         gid_t gid;
1555                         char *endptr;
1556
1557                         gid = strtoul(value, &endptr, 10);
1558                         if (endptr[0] == '\0') {
1559                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1560                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1561                                 gid = add_gid(rules, value);
1562                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1563                         } else if (rules->resolve_names >= 0) {
1564                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1565                         }
1566                         rule_tmp.rule.rule.can_set_name = true;
1567                         continue;
1568                 }
1569
1570                 if (strcmp(key, "MODE") == 0) {
1571                         mode_t mode;
1572                         char *endptr;
1573
1574                         mode = strtol(value, &endptr, 8);
1575                         if (endptr[0] == '\0')
1576                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1577                         else
1578                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1579                         rule_tmp.rule.rule.can_set_name = true;
1580                         continue;
1581                 }
1582
1583                 if (strcmp(key, "OPTIONS") == 0) {
1584                         const char *pos;
1585
1586                         pos = strstr(value, "link_priority=");
1587                         if (pos != NULL) {
1588                                 int prio = atoi(&pos[strlen("link_priority=")]);
1589
1590                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1591                                 dbg(rules->udev, "link priority=%i\n", prio);
1592                         }
1593
1594                         pos = strstr(value, "event_timeout=");
1595                         if (pos != NULL) {
1596                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1597
1598                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1599                                 dbg(rules->udev, "event timeout=%i\n", tout);
1600                         }
1601
1602                         pos = strstr(value, "string_escape=");
1603                         if (pos != NULL) {
1604                                 pos = &pos[strlen("string_escape=")];
1605                                 if (strncmp(pos, "none", strlen("none")) == 0)
1606                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1607                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1608                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1609                         }
1610
1611                         pos = strstr(value, "db_persist");
1612                         if (pos != NULL)
1613                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1614
1615                         pos = strstr(value, "nowatch");
1616                         if (pos != NULL) {
1617                                 const int off = 0;
1618
1619                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1620                                 dbg(rules->udev, "inotify watch of device disabled\n");
1621                         } else {
1622                                 pos = strstr(value, "watch");
1623                                 if (pos != NULL) {
1624                                         const int on = 1;
1625
1626                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1627                                         dbg(rules->udev, "inotify watch of device requested\n");
1628                                 }
1629                         }
1630
1631                         pos = strstr(value, "static_node=");
1632                         if (pos != NULL) {
1633                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1634                                 rule_tmp.rule.rule.has_static_node = true;
1635                         }
1636
1637                         continue;
1638                 }
1639                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1640         }
1641
1642         /* add rule token */
1643         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1644         if (add_token(rules, &rule_tmp.rule) != 0)
1645                 goto invalid;
1646
1647         /* add tokens to list, sorted by type */
1648         if (sort_token(rules, &rule_tmp) != 0)
1649                 goto invalid;
1650
1651         return 0;
1652 invalid:
1653         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1654         return -1;
1655 }
1656
1657 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1658 {
1659         FILE *f;
1660         unsigned int first_token;
1661         char line[UTIL_LINE_SIZE];
1662         int line_nr = 0;
1663         unsigned int i;
1664
1665         info(rules->udev, "reading '%s' as rules file\n", filename);
1666
1667         f = fopen(filename, "r");
1668         if (f == NULL)
1669                 return -1;
1670
1671         first_token = rules->token_cur;
1672
1673         while (fgets(line, sizeof(line), f) != NULL) {
1674                 char *key;
1675                 size_t len;
1676
1677                 /* skip whitespace */
1678                 line_nr++;
1679                 key = line;
1680                 while (isspace(key[0]))
1681                         key++;
1682
1683                 /* comment */
1684                 if (key[0] == '#')
1685                         continue;
1686
1687                 len = strlen(line);
1688                 if (len < 3)
1689                         continue;
1690
1691                 /* continue reading if backslash+newline is found */
1692                 while (line[len-2] == '\\') {
1693                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1694                                 break;
1695                         if (strlen(&line[len-2]) < 2)
1696                                 break;
1697                         line_nr++;
1698                         len = strlen(line);
1699                 }
1700
1701                 if (len+1 >= sizeof(line)) {
1702                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1703                         continue;
1704                 }
1705                 add_rule(rules, key, filename, filename_off, line_nr);
1706         }
1707         fclose(f);
1708
1709         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1710         for (i = first_token+1; i < rules->token_cur; i++) {
1711                 if (rules->tokens[i].type == TK_A_GOTO) {
1712                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1713                         unsigned int j;
1714
1715                         for (j = i+1; j < rules->token_cur; j++) {
1716                                 if (rules->tokens[j].type != TK_RULE)
1717                                         continue;
1718                                 if (rules->tokens[j].rule.label_off == 0)
1719                                         continue;
1720                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1721                                         continue;
1722                                 rules->tokens[i].key.rule_goto = j;
1723                                 break;
1724                         }
1725                         if (rules->tokens[i].key.rule_goto == 0)
1726                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1727                 }
1728         }
1729         return 0;
1730 }
1731
1732 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1733 {
1734         DIR *dir;
1735         struct dirent *dent;
1736         char filename[UTIL_PATH_SIZE];
1737
1738         dbg(udev, "open directory '%s'\n", dirname);
1739         dir = opendir(dirname);
1740         if (dir == NULL) {
1741                 info(udev, "unable to open '%s': %m\n", dirname);
1742                 return -1;
1743         }
1744
1745         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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                 /*
1762                  * the basename is the key, the filename the value
1763                  * identical basenames from different directories overwrite each other
1764                  * entries are sorted after basename
1765                  */
1766                 udev_list_entry_add(udev, file_list, dent->d_name, filename, UDEV_LIST_UNIQUE|UDEV_LIST_SORT);
1767         }
1768
1769         closedir(dir);
1770         return 0;
1771 }
1772
1773 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1774 {
1775         struct udev_rules *rules;
1776         struct udev_list_node file_list;
1777         struct udev_list_entry *file_loop;
1778         struct token end_token;
1779
1780         rules = calloc(1, sizeof(struct udev_rules));
1781         if (rules == NULL)
1782                 return NULL;
1783         rules->udev = udev;
1784         rules->resolve_names = resolve_names;
1785         udev_list_init(&file_list);
1786
1787         /* init token array and string buffer */
1788         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1789         if (rules->tokens == NULL) {
1790                 free(rules);
1791                 return NULL;
1792         }
1793         rules->token_max = PREALLOC_TOKEN;
1794
1795         rules->buf = malloc(PREALLOC_STRBUF);
1796         if (rules->buf == NULL) {
1797                 free(rules->tokens);
1798                 free(rules);
1799                 return NULL;
1800         }
1801         rules->buf_max = PREALLOC_STRBUF;
1802         /* offset 0 is always '\0' */
1803         rules->buf[0] = '\0';
1804         rules->buf_cur = 1;
1805         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1806             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1807
1808         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1809         if (rules->trie_nodes == NULL) {
1810                 free(rules->buf);
1811                 free(rules->tokens);
1812                 free(rules);
1813                 return NULL;
1814         }
1815         rules->trie_nodes_max = PREALLOC_TRIE;
1816         /* offset 0 is the trie root, with an empty string */
1817         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1818         rules->trie_nodes_cur = 1;
1819
1820         if (udev_get_rules_path(udev) == NULL) {
1821                 char filename[UTIL_PATH_SIZE];
1822
1823                 /* /lib/udev -- default/package rules */
1824                 add_matching_files(udev, &file_list, LIBEXECDIR "/rules.d", ".rules");
1825
1826                 /* /etc/udev -- system-specific/user/admin rules */
1827                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1828
1829                 /* /run/udev -- throw-away/temporary rules */
1830                 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1831                 add_matching_files(udev, &file_list, filename, ".rules");
1832         } else {
1833                 /* custom rules files location for testing */
1834                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1835         }
1836
1837         /* add all filenames to the string buffer */
1838         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1839                 const char *filename = udev_list_entry_get_value(file_loop);
1840                 unsigned int filename_off;
1841
1842                 filename_off = add_string(rules, filename);
1843                 /* the offset in the rule is limited to unsigned short */
1844                 if (filename_off < USHRT_MAX)
1845                         udev_list_entry_set_num(file_loop, filename_off);
1846         }
1847
1848         /* parse all rules files */
1849         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1850                 const char *filename = udev_list_entry_get_value(file_loop);
1851                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1852                 struct stat st;
1853
1854                 if (stat(filename, &st) != 0) {
1855                         err(udev, "can not find '%s': %m\n", filename);
1856                         continue;
1857                 }
1858                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1859                         info(udev, "ignore empty '%s'\n", filename);
1860                         continue;
1861                 }
1862                 if (S_ISCHR(st.st_mode)) {
1863                         info(udev, "ignore masked '%s'\n", filename);
1864                         continue;
1865                 }
1866                 parse_file(rules, filename, filename_off);
1867         }
1868         udev_list_cleanup_entries(udev, &file_list);
1869
1870         memset(&end_token, 0x00, sizeof(struct token));
1871         end_token.type = TK_END;
1872         add_token(rules, &end_token);
1873
1874         /* shrink allocated token and string buffer */
1875         if (rules->token_cur < rules->token_max) {
1876                 struct token *tokens;
1877
1878                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1879                 if (tokens != NULL || rules->token_cur == 0) {
1880                         rules->tokens = tokens;
1881                         rules->token_max = rules->token_cur;
1882                 }
1883         }
1884         if (rules->buf_cur < rules->buf_max) {
1885                 char *buf;
1886
1887                 buf = realloc(rules->buf, rules->buf_cur);
1888                 if (buf != NULL || rules->buf_cur == 0) {
1889                         rules->buf = buf;
1890                         rules->buf_max = rules->buf_cur;
1891                 }
1892         }
1893         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1894              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1895         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1896              rules->trie_nodes_cur * sizeof(struct trie_node),
1897              rules->trie_nodes_cur, sizeof(struct trie_node));
1898
1899         /* cleanup trie */
1900         free(rules->trie_nodes);
1901         rules->trie_nodes = NULL;
1902         rules->trie_nodes_cur = 0;
1903         rules->trie_nodes_max = 0;
1904
1905         /* cleanup uid/gid cache */
1906         free(rules->uids);
1907         rules->uids = NULL;
1908         rules->uids_cur = 0;
1909         rules->uids_max = 0;
1910         free(rules->gids);
1911         rules->gids = NULL;
1912         rules->gids_cur = 0;
1913         rules->gids_max = 0;
1914
1915         dump_rules(rules);
1916         return rules;
1917 }
1918
1919 void udev_rules_unref(struct udev_rules *rules)
1920 {
1921         if (rules == NULL)
1922                 return;
1923         free(rules->tokens);
1924         free(rules->buf);
1925         free(rules->trie_nodes);
1926         free(rules->uids);
1927         free(rules->gids);
1928         free(rules);
1929 }
1930
1931 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1932 {
1933         char *key_value = &rules->buf[token->key.value_off];
1934         char *pos;
1935         bool match = false;
1936
1937         if (val == NULL)
1938                 val = "";
1939
1940         switch (token->key.glob) {
1941         case GL_PLAIN:
1942                 match = (strcmp(key_value, val) == 0);
1943                 break;
1944         case GL_GLOB:
1945                 match = (fnmatch(key_value, val, 0) == 0);
1946                 break;
1947         case GL_SPLIT:
1948                 {
1949                         const char *split;
1950                         size_t len;
1951
1952                         split = &rules->buf[token->key.value_off];
1953                         len = strlen(val);
1954                         for (;;) {
1955                                 const char *next;
1956
1957                                 next = strchr(split, '|');
1958                                 if (next != NULL) {
1959                                         size_t matchlen = (size_t)(next - split);
1960
1961                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1962                                         if (match)
1963                                                 break;
1964                                 } else {
1965                                         match = (strcmp(split, val) == 0);
1966                                         break;
1967                                 }
1968                                 split = &next[1];
1969                         }
1970                         break;
1971                 }
1972         case GL_SPLIT_GLOB:
1973                 {
1974                         char value[UTIL_PATH_SIZE];
1975
1976                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1977                         key_value = value;
1978                         while (key_value != NULL) {
1979                                 pos = strchr(key_value, '|');
1980                                 if (pos != NULL) {
1981                                         pos[0] = '\0';
1982                                         pos = &pos[1];
1983                                 }
1984                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1985                                 match = (fnmatch(key_value, val, 0) == 0);
1986                                 if (match)
1987                                         break;
1988                                 key_value = pos;
1989                         }
1990                         break;
1991                 }
1992         case GL_SOMETHING:
1993                 match = (val[0] != '\0');
1994                 break;
1995         case GL_UNSET:
1996                 return -1;
1997         }
1998
1999         if (match && (token->key.op == OP_MATCH)) {
2000                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
2001                 return 0;
2002         }
2003         if (!match && (token->key.op == OP_NOMATCH)) {
2004                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
2005                 return 0;
2006         }
2007         dbg(rules->udev, "%s is not true\n", token_str(token->type));
2008         return -1;
2009 }
2010
2011 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
2012 {
2013         const char *name;
2014         char nbuf[UTIL_NAME_SIZE];
2015         const char *value;
2016         char vbuf[UTIL_NAME_SIZE];
2017         size_t len;
2018
2019         name = &rules->buf[cur->key.attr_off];
2020         switch (cur->key.attrsubst) {
2021         case SB_FORMAT:
2022                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2023                 name = nbuf;
2024                 /* fall through */
2025         case SB_NONE:
2026                 value = udev_device_get_sysattr_value(dev, name);
2027                 if (value == NULL)
2028                         return -1;
2029                 break;
2030         case SB_SUBSYS:
2031                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2032                         return -1;
2033                 value = vbuf;
2034                 break;
2035         default:
2036                 return -1;
2037         }
2038
2039         /* remove trailing whitespace, if not asked to match for it */
2040         len = strlen(value);
2041         if (len > 0 && isspace(value[len-1])) {
2042                 const char *key_value;
2043                 size_t klen;
2044
2045                 key_value = &rules->buf[cur->key.value_off];
2046                 klen = strlen(key_value);
2047                 if (klen > 0 && !isspace(key_value[klen-1])) {
2048                         if (value != vbuf) {
2049                                 util_strscpy(vbuf, sizeof(vbuf), value);
2050                                 value = vbuf;
2051                         }
2052                         while (len > 0 && isspace(vbuf[--len]))
2053                                 vbuf[len] = '\0';
2054                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2055                 }
2056         }
2057
2058         return match_key(rules, cur, value);
2059 }
2060
2061 enum escape_type {
2062         ESCAPE_UNSET,
2063         ESCAPE_NONE,
2064         ESCAPE_REPLACE,
2065 };
2066
2067 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2068 {
2069         struct token *cur;
2070         struct token *rule;
2071         enum escape_type esc = ESCAPE_UNSET;
2072         bool can_set_name;
2073
2074         if (rules->tokens == NULL)
2075                 return -1;
2076
2077         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2078                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2079                          udev_device_get_ifindex(event->dev) > 0));
2080
2081         /* loop through token list, match, run actions or forward to next rule */
2082         cur = &rules->tokens[0];
2083         rule = cur;
2084         for (;;) {
2085                 dump_token(rules, cur);
2086                 switch (cur->type) {
2087                 case TK_RULE:
2088                         /* current rule */
2089                         rule = cur;
2090                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2091                         if (!can_set_name && rule->rule.can_set_name)
2092                                 goto nomatch;
2093                         esc = ESCAPE_UNSET;
2094                         break;
2095                 case TK_M_ACTION:
2096                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2097                                 goto nomatch;
2098                         break;
2099                 case TK_M_DEVPATH:
2100                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2101                                 goto nomatch;
2102                         break;
2103                 case TK_M_KERNEL:
2104                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2105                                 goto nomatch;
2106                         break;
2107                 case TK_M_DEVLINK: {
2108                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2109                         struct udev_list_entry *list_entry;
2110                         bool match = false;
2111
2112                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2113                                 const char *devlink;
2114
2115                                 devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2116                                 if (match_key(rules, cur, devlink) == 0) {
2117                                         match = true;
2118                                         break;
2119                                 }
2120                         }
2121                         if (!match)
2122                                 goto nomatch;
2123                         break;
2124                 }
2125                 case TK_M_NAME:
2126                         if (match_key(rules, cur, event->name) != 0)
2127                                 goto nomatch;
2128                         break;
2129                 case TK_M_ENV: {
2130                         const char *key_name = &rules->buf[cur->key.attr_off];
2131                         const char *value;
2132
2133                         value = udev_device_get_property_value(event->dev, key_name);
2134                         if (value == NULL) {
2135                                 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2136                                 value = "";
2137                         }
2138                         if (match_key(rules, cur, value))
2139                                 goto nomatch;
2140                         break;
2141                 }
2142                 case TK_M_TAG: {
2143                         struct udev_list_entry *list_entry;
2144                         bool match = false;
2145
2146                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2147                                 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2148                                         match = true;
2149                                         break;
2150                                 }
2151                         }
2152                         if (!match && (cur->key.op != OP_NOMATCH))
2153                                 goto nomatch;
2154                         break;
2155                 }
2156                 case TK_M_SUBSYSTEM:
2157                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2158                                 goto nomatch;
2159                         break;
2160                 case TK_M_DRIVER:
2161                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2162                                 goto nomatch;
2163                         break;
2164                 case TK_M_WAITFOR: {
2165                         char filename[UTIL_PATH_SIZE];
2166                         int found;
2167
2168                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2169                         found = (wait_for_file(event->dev, filename, 10) == 0);
2170                         if (!found && (cur->key.op != OP_NOMATCH))
2171                                 goto nomatch;
2172                         break;
2173                 }
2174                 case TK_M_ATTR:
2175                         if (match_attr(rules, event->dev, event, cur) != 0)
2176                                 goto nomatch;
2177                         break;
2178                 case TK_M_KERNELS:
2179                 case TK_M_SUBSYSTEMS:
2180                 case TK_M_DRIVERS:
2181                 case TK_M_ATTRS:
2182                 case TK_M_TAGS: {
2183                         struct token *next;
2184
2185                         /* get whole sequence of parent matches */
2186                         next = cur;
2187                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2188                                 next++;
2189
2190                         /* loop over parents */
2191                         event->dev_parent = event->dev;
2192                         for (;;) {
2193                                 struct token *key;
2194
2195                                 dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2196                                 /* loop over sequence of parent match keys */
2197                                 for (key = cur; key < next; key++ ) {
2198                                         dump_token(rules, key);
2199                                         switch(key->type) {
2200                                         case TK_M_KERNELS:
2201                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2202                                                         goto try_parent;
2203                                                 break;
2204                                         case TK_M_SUBSYSTEMS:
2205                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2206                                                         goto try_parent;
2207                                                 break;
2208                                         case TK_M_DRIVERS:
2209                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2210                                                         goto try_parent;
2211                                                 break;
2212                                         case TK_M_ATTRS:
2213                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2214                                                         goto try_parent;
2215                                                 break;
2216                                         case TK_M_TAGS: {
2217                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2218
2219                                                 if (match && key->key.op == OP_NOMATCH)
2220                                                         goto try_parent;
2221                                                 if (!match && key->key.op == OP_MATCH)
2222                                                         goto try_parent;
2223                                                 break;
2224                                         }
2225                                         default:
2226                                                 goto nomatch;
2227                                         }
2228                                         dbg(event->udev, "parent key matched\n");
2229                                 }
2230                                 dbg(event->udev, "all parent keys matched\n");
2231                                 break;
2232
2233                         try_parent:
2234                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2235                                 if (event->dev_parent == NULL)
2236                                         goto nomatch;
2237                         }
2238                         /* move behind our sequence of parent match keys */
2239                         cur = next;
2240                         continue;
2241                 }
2242                 case TK_M_TEST: {
2243                         char filename[UTIL_PATH_SIZE];
2244                         struct stat statbuf;
2245                         int match;
2246
2247                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2248                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2249                                 if (filename[0] != '/') {
2250                                         char tmp[UTIL_PATH_SIZE];
2251
2252                                         util_strscpy(tmp, sizeof(tmp), filename);
2253                                         util_strscpyl(filename, sizeof(filename),
2254                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2255                                 }
2256                         }
2257                         attr_subst_subdir(filename, sizeof(filename));
2258
2259                         match = (stat(filename, &statbuf) == 0);
2260                         dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2261                         if (match && cur->key.mode > 0) {
2262                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2263                                 dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2264                                     match ? "matches" : "does not match", cur->key.mode);
2265                         }
2266                         if (match && cur->key.op == OP_NOMATCH)
2267                                 goto nomatch;
2268                         if (!match && cur->key.op == OP_MATCH)
2269                                 goto nomatch;
2270                         break;
2271                 }
2272                 case TK_M_EVENT_TIMEOUT:
2273                         info(event->udev, "OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2274                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2275                         break;
2276                 case TK_M_PROGRAM: {
2277                         char program[UTIL_PATH_SIZE];
2278                         char **envp;
2279                         char result[UTIL_PATH_SIZE];
2280
2281                         free(event->program_result);
2282                         event->program_result = NULL;
2283                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2284                         envp = udev_device_get_properties_envp(event->dev);
2285                         info(event->udev, "PROGRAM '%s' %s:%u\n",
2286                              program,
2287                              &rules->buf[rule->rule.filename_off],
2288                              rule->rule.filename_line);
2289
2290                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2291                                 if (cur->key.op != OP_NOMATCH)
2292                                         goto nomatch;
2293                         } else {
2294                                 int count;
2295
2296                                 util_remove_trailing_chars(result, '\n');
2297                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2298                                         count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2299                                         if (count > 0)
2300                                                 info(event->udev, "%i character(s) replaced\n" , count);
2301                                 }
2302                                 event->program_result = strdup(result);
2303                                 dbg(event->udev, "storing result '%s'\n", event->program_result);
2304                                 if (cur->key.op == OP_NOMATCH)
2305                                         goto nomatch;
2306                         }
2307                         break;
2308                 }
2309                 case TK_M_IMPORT_FILE: {
2310                         char import[UTIL_PATH_SIZE];
2311
2312                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2313                         if (import_file_into_properties(event->dev, import) != 0)
2314                                 if (cur->key.op != OP_NOMATCH)
2315                                         goto nomatch;
2316                         break;
2317                 }
2318                 case TK_M_IMPORT_PROG: {
2319                         char import[UTIL_PATH_SIZE];
2320
2321                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2322                         info(event->udev, "IMPORT '%s' %s:%u\n",
2323                              import,
2324                              &rules->buf[rule->rule.filename_off],
2325                              rule->rule.filename_line);
2326
2327                         if (import_program_into_properties(event, import, sigmask) != 0)
2328                                 if (cur->key.op != OP_NOMATCH)
2329                                         goto nomatch;
2330                         break;
2331                 }
2332                 case TK_M_IMPORT_DB: {
2333                         const char *key = &rules->buf[cur->key.value_off];
2334                         const char *value;
2335
2336                         value = udev_device_get_property_value(event->dev_db, key);
2337                         if (value != NULL) {
2338                                 struct udev_list_entry *entry;
2339
2340                                 entry = udev_device_add_property(event->dev, key, value);
2341                                 udev_list_entry_set_num(entry, true);
2342                         } else {
2343                                 if (cur->key.op != OP_NOMATCH)
2344                                         goto nomatch;
2345                         }
2346                         break;
2347                 }
2348                 case TK_M_IMPORT_CMDLINE: {
2349                         FILE *f;
2350                         bool imported = false;
2351
2352                         f = fopen("/proc/cmdline", "r");
2353                         if (f != NULL) {
2354                                 char cmdline[4096];
2355
2356                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2357                                         const char *key = &rules->buf[cur->key.value_off];
2358                                         char *pos;
2359
2360                                         pos = strstr(cmdline, key);
2361                                         if (pos != NULL) {
2362                                                 struct udev_list_entry *entry;
2363
2364                                                 pos += strlen(key);
2365                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2366                                                         /* we import simple flags as 'FLAG=1' */
2367                                                         entry = udev_device_add_property(event->dev, key, "1");
2368                                                         udev_list_entry_set_num(entry, true);
2369                                                         imported = true;
2370                                                 } else if (pos[0] == '=') {
2371                                                         const char *value;
2372
2373                                                         pos++;
2374                                                         value = pos;
2375                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2376                                                                 pos++;
2377                                                         pos[0] = '\0';
2378                                                         entry = udev_device_add_property(event->dev, key, value);
2379                                                         udev_list_entry_set_num(entry, true);
2380                                                         imported = true;
2381                                                 }
2382                                         }
2383                                 }
2384                                 fclose(f);
2385                         }
2386                         if (!imported && cur->key.op != OP_NOMATCH)
2387                                 goto nomatch;
2388                         break;
2389                 }
2390                 case TK_M_IMPORT_PARENT: {
2391                         char import[UTIL_PATH_SIZE];
2392
2393                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2394                         if (import_parent_into_properties(event->dev, import) != 0)
2395                                 if (cur->key.op != OP_NOMATCH)
2396                                         goto nomatch;
2397                         break;
2398                 }
2399                 case TK_M_RESULT:
2400                         if (match_key(rules, cur, event->program_result) != 0)
2401                                 goto nomatch;
2402                         break;
2403                 case TK_A_STRING_ESCAPE_NONE:
2404                         esc = ESCAPE_NONE;
2405                         break;
2406                 case TK_A_STRING_ESCAPE_REPLACE:
2407                         esc = ESCAPE_REPLACE;
2408                         break;
2409                 case TK_A_DB_PERSIST:
2410                         udev_device_set_db_persist(event->dev);
2411                         break;
2412                 case TK_A_INOTIFY_WATCH:
2413                         if (event->inotify_watch_final)
2414                                 break;
2415                         if (cur->key.op == OP_ASSIGN_FINAL)
2416                                 event->inotify_watch_final = true;
2417                         event->inotify_watch = cur->key.watch;
2418                         break;
2419                 case TK_A_DEVLINK_PRIO:
2420                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2421                         break;
2422                 case TK_A_OWNER: {
2423                         char owner[UTIL_NAME_SIZE];
2424
2425                         if (event->owner_final)
2426                                 break;
2427                         if (cur->key.op == OP_ASSIGN_FINAL)
2428                                 event->owner_final = true;
2429                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2430                         event->uid = util_lookup_user(event->udev, owner);
2431                         info(event->udev, "OWNER %u %s:%u\n",
2432                              event->uid,
2433                              &rules->buf[rule->rule.filename_off],
2434                              rule->rule.filename_line);
2435                         break;
2436                 }
2437                 case TK_A_GROUP: {
2438                         char group[UTIL_NAME_SIZE];
2439
2440                         if (event->group_final)
2441                                 break;
2442                         if (cur->key.op == OP_ASSIGN_FINAL)
2443                                 event->group_final = true;
2444                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2445                         event->gid = util_lookup_group(event->udev, group);
2446                         info(event->udev, "GROUP %u %s:%u\n",
2447                              event->gid,
2448                              &rules->buf[rule->rule.filename_off],
2449                              rule->rule.filename_line);
2450                         break;
2451                 }
2452                 case TK_A_MODE: {
2453                         char mode_str[UTIL_NAME_SIZE];
2454                         mode_t mode;
2455                         char *endptr;
2456
2457                         if (event->mode_final)
2458                                 break;
2459                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2460                         mode = strtol(mode_str, &endptr, 8);
2461                         if (endptr[0] != '\0') {
2462                                 err(event->udev, "ignoring invalid mode '%s'\n", mode_str);
2463                                 break;
2464                         }
2465                         if (cur->key.op == OP_ASSIGN_FINAL)
2466                                 event->mode_final = true;
2467                         event->mode_set = true;
2468                         event->mode = mode;
2469                         info(event->udev, "MODE %#o %s:%u\n",
2470                              event->mode,
2471                              &rules->buf[rule->rule.filename_off],
2472                              rule->rule.filename_line);
2473                         break;
2474                 }
2475                 case TK_A_OWNER_ID:
2476                         if (event->owner_final)
2477                                 break;
2478                         if (cur->key.op == OP_ASSIGN_FINAL)
2479                                 event->owner_final = true;
2480                         event->uid = cur->key.uid;
2481                         info(event->udev, "OWNER %u %s:%u\n",
2482                              event->uid,
2483                              &rules->buf[rule->rule.filename_off],
2484                              rule->rule.filename_line);
2485                         break;
2486                 case TK_A_GROUP_ID:
2487                         if (event->group_final)
2488                                 break;
2489                         if (cur->key.op == OP_ASSIGN_FINAL)
2490                                 event->group_final = true;
2491                         event->gid = cur->key.gid;
2492                         info(event->udev, "GROUP %u %s:%u\n",
2493                              event->gid,
2494                              &rules->buf[rule->rule.filename_off],
2495                              rule->rule.filename_line);
2496                         break;
2497                 case TK_A_MODE_ID:
2498                         if (event->mode_final)
2499                                 break;
2500                         if (cur->key.op == OP_ASSIGN_FINAL)
2501                                 event->mode_final = true;
2502                         event->mode_set = true;
2503                         event->mode = cur->key.mode;
2504                         info(event->udev, "MODE %#o %s:%u\n",
2505                              event->mode,
2506                              &rules->buf[rule->rule.filename_off],
2507                              rule->rule.filename_line);
2508                         break;
2509                 case TK_A_STATIC_NODE:
2510                         break;
2511                 case TK_A_ENV: {
2512                         const char *name = &rules->buf[cur->key.attr_off];
2513                         char *value = &rules->buf[cur->key.value_off];
2514
2515                         if (value[0] != '\0') {
2516                                 char temp_value[UTIL_NAME_SIZE];
2517                                 struct udev_list_entry *entry;
2518
2519                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2520                                 entry = udev_device_add_property(event->dev, name, temp_value);
2521                                 /* store in db, skip private keys */
2522                                 if (name[0] != '.')
2523                                         udev_list_entry_set_num(entry, true);
2524                         } else {
2525                                 udev_device_add_property(event->dev, name, NULL);
2526                         }
2527                         break;
2528                 }
2529                 case TK_A_TAG: {
2530                         char tag[UTIL_PATH_SIZE];
2531                         const char *p;
2532
2533                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2534                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2535                                 udev_device_cleanup_tags_list(event->dev);
2536                         for (p = tag; *p != '\0'; p++) {
2537                                 if ((*p >= 'a' && *p <= 'z') ||
2538                                     (*p >= 'A' && *p <= 'Z') ||
2539                                     (*p >= '0' && *p <= '9') ||
2540                                     *p == '-' || *p == '_')
2541                                         continue;
2542                                 err(event->udev, "ignoring invalid tag name '%s'\n", tag);
2543                                 break;
2544                         }
2545                         udev_device_add_tag(event->dev, tag);
2546                         break;
2547                 }
2548                 case TK_A_NAME: {
2549                         const char *name  = &rules->buf[cur->key.value_off];
2550                         char name_str[UTIL_PATH_SIZE];
2551                         int count;
2552
2553                         if (event->name_final)
2554                                 break;
2555                         if (cur->key.op == OP_ASSIGN_FINAL)
2556                                 event->name_final = true;
2557                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2558                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2559                                 count = udev_util_replace_chars(name_str, "/");
2560                                 if (count > 0)
2561                                         info(event->udev, "%i character(s) replaced\n", count);
2562                         }
2563                         free(event->name);
2564                         event->name = strdup(name_str);
2565                         info(event->udev, "NAME '%s' %s:%u\n",
2566                              event->name,
2567                              &rules->buf[rule->rule.filename_off],
2568                              rule->rule.filename_line);
2569                         break;
2570                 }
2571                 case TK_A_DEVLINK: {
2572                         char temp[UTIL_PATH_SIZE];
2573                         char filename[UTIL_PATH_SIZE];
2574                         char *pos, *next;
2575                         int count = 0;
2576
2577                         if (event->devlink_final)
2578                                 break;
2579                         if (major(udev_device_get_devnum(event->dev)) == 0)
2580                                 break;
2581                         if (cur->key.op == OP_ASSIGN_FINAL)
2582                                 event->devlink_final = true;
2583                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2584                                 udev_device_cleanup_devlinks_list(event->dev);
2585
2586                         /* allow  multiple symlinks separated by spaces */
2587                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2588                         if (esc == ESCAPE_UNSET)
2589                                 count = udev_util_replace_chars(temp, "/ ");
2590                         else if (esc == ESCAPE_REPLACE)
2591                                 count = udev_util_replace_chars(temp, "/");
2592                         if (count > 0)
2593                                 info(event->udev, "%i character(s) replaced\n" , count);
2594                         dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2595                         pos = temp;
2596                         while (isspace(pos[0]))
2597                                 pos++;
2598                         next = strchr(pos, ' ');
2599                         while (next != NULL) {
2600                                 next[0] = '\0';
2601                                 info(event->udev, "LINK '%s' %s:%u\n", pos,
2602                                      &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2603                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2604                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2605                                 while (isspace(next[1]))
2606                                         next++;
2607                                 pos = &next[1];
2608                                 next = strchr(pos, ' ');
2609                         }
2610                         if (pos[0] != '\0') {
2611                                 info(event->udev, "LINK '%s' %s:%u\n", pos,
2612                                      &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2613                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2614                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2615                         }
2616                         break;
2617                 }
2618                 case TK_A_ATTR: {
2619                         const char *key_name = &rules->buf[cur->key.attr_off];
2620                         char attr[UTIL_PATH_SIZE];
2621                         char value[UTIL_NAME_SIZE];
2622                         FILE *f;
2623
2624                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2625                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2626                         attr_subst_subdir(attr, sizeof(attr));
2627
2628                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2629                         info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2630                              &rules->buf[rule->rule.filename_off],
2631                              rule->rule.filename_line);
2632                         f = fopen(attr, "w");
2633                         if (f != NULL) {
2634                                 if (fprintf(f, "%s", value) <= 0)
2635                                         err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2636                                 fclose(f);
2637                         } else {
2638                                 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2639                         }
2640                         break;
2641                 }
2642                 case TK_A_RUN: {
2643                         struct udev_list_entry *list_entry;
2644
2645                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2646                                 udev_list_cleanup_entries(event->udev, &event->run_list);
2647                         info(event->udev, "RUN '%s' %s:%u\n",
2648                              &rules->buf[cur->key.value_off],
2649                              &rules->buf[rule->rule.filename_off],
2650                              rule->rule.filename_line);
2651                         list_entry = udev_list_entry_add(event->udev, &event->run_list,
2652                                                          &rules->buf[cur->key.value_off], NULL, UDEV_LIST_UNIQUE);
2653                         if (cur->key.fail_on_error)
2654                                 udev_list_entry_set_num(list_entry, true);
2655                         break;
2656                 }
2657                 case TK_A_GOTO:
2658                         if (cur->key.rule_goto == 0)
2659                                 break;
2660                         cur = &rules->tokens[cur->key.rule_goto];
2661                         continue;
2662                 case TK_END:
2663                         return 0;
2664
2665                 case TK_M_PARENTS_MIN:
2666                 case TK_M_PARENTS_MAX:
2667                 case TK_M_MAX:
2668                 case TK_UNSET:
2669                         err(rules->udev, "wrong type %u\n", cur->type);
2670                         goto nomatch;
2671                 }
2672
2673                 cur++;
2674                 continue;
2675         nomatch:
2676                 /* fast-forward to next rule */
2677                 cur = rule + rule->rule.token_count;
2678                 dbg(rules->udev, "forward to rule: %u\n",
2679                                  (unsigned int) (cur - rules->tokens));
2680         }
2681 }
2682
2683 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2684 {
2685         struct token *cur;
2686         struct token *rule;
2687         uid_t uid = 0;
2688         gid_t gid = 0;
2689         mode_t mode = 0;
2690
2691         if (rules->tokens == NULL)
2692                 return;
2693
2694         cur = &rules->tokens[0];
2695         rule = cur;
2696         for (;;) {
2697                 switch (cur->type) {
2698                 case TK_RULE:
2699                         /* current rule */
2700                         rule = cur;
2701
2702                         /* skip rules without a static_node tag */
2703                         if (!rule->rule.has_static_node)
2704                                 goto next;
2705
2706                         uid = 0;
2707                         gid = 0;
2708                         mode = 0;
2709                         break;
2710                 case TK_A_OWNER_ID:
2711                         uid = cur->key.uid;
2712                         break;
2713                 case TK_A_GROUP_ID:
2714                         gid = cur->key.gid;
2715                         break;
2716                 case TK_A_MODE_ID:
2717                         mode = cur->key.mode;
2718                         break;
2719                 case TK_A_STATIC_NODE: {
2720                         char filename[UTIL_PATH_SIZE];
2721                         struct stat stats;
2722
2723                         /* we assure, that the permissions tokens are sorted before the static token */
2724                         if (uid == 0 && gid == 0)
2725                                 goto next;
2726                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2727                                       &rules->buf[cur->key.value_off], NULL);
2728                         if (stat(filename, &stats) != 0)
2729                                 goto next;
2730                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2731                                 goto next;
2732
2733                         if (mode == 0 && gid > 0)
2734                                 mode = 0660;
2735                         if (mode != (stats.st_mode & 0777)) {
2736                                 chmod(filename, mode);
2737                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2738                         }
2739
2740                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2741                                 chown(filename, uid, gid);
2742                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2743                         }
2744
2745                         utimensat(AT_FDCWD, filename, NULL, 0);
2746                         break;
2747                 }
2748                 case TK_END:
2749                         return;
2750                 }
2751
2752                 cur++;
2753                 continue;
2754 next:
2755                 /* fast-forward to next rule */
2756                 cur = rule + rule->rule.token_count;
2757                 continue;
2758         }
2759 }