udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN                  2048
  36 #define PREALLOC_STRBUF                 32 * 1024
  37 #define PREALLOC_TRIE                   256
  38
  39 struct uid_gid {
  40         unsigned int name_off;
  41         union {
  42                 uid_t   uid;
  43                 gid_t   gid;
  44         };
  45 };
  46
  47 struct trie_node {
  48         /* this node's first child */
  49         unsigned int child_idx;
  50         /* the next child of our parent node's child list */
  51         unsigned int next_child_idx;
  52         /* this node's last child (shortcut for append) */
  53         unsigned int last_child_idx;
  54         unsigned int value_off;
  55         unsigned short value_len;
  56         unsigned char key;
  57 };
  58
  59 struct udev_rules {
  60         struct udev *udev;
  61         int resolve_names;
  62
  63         /* every key in the rules file becomes a token */
  64         struct token *tokens;
  65         unsigned int token_cur;
  66         unsigned int token_max;
  67
  68         /* all key strings are copied to a single string buffer */
  69         char *buf;
  70         size_t buf_cur;
  71         size_t buf_max;
  72         unsigned int buf_count;
  73
  74         /* during rule parsing, strings are indexed to find duplicates */
  75         struct trie_node *trie_nodes;
  76         unsigned int trie_nodes_cur;
  77         unsigned int trie_nodes_max;
  78
  79         /* during rule parsing, uid/gid lookup results are cached */
  80         struct uid_gid *uids;
  81         unsigned int uids_cur;
  82         unsigned int uids_max;
  83         struct uid_gid *gids;
  84         unsigned int gids_cur;
  85         unsigned int gids_max;
  86 };
  87
  88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  89 enum operation_type {
  90         OP_UNSET,
  91
  92         OP_MATCH,
  93         OP_NOMATCH,
  94         OP_MATCH_MAX,
  95
  96         OP_ADD,
  97         OP_ASSIGN,
  98         OP_ASSIGN_FINAL,
  99 };
 100
 101 enum string_glob_type {
 102         GL_UNSET,
 103         GL_PLAIN,                       /* no special chars */
 104         GL_GLOB,                        /* shell globs ?,*,[] */
 105         GL_SPLIT,                       /* multi-value A|B */
 106         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 107         GL_SOMETHING,                   /* commonly used "?*" */
 108 };
 109
 110 enum string_subst_type {
 111         SB_UNSET,
 112         SB_NONE,
 113         SB_FORMAT,
 114         SB_SUBSYS,
 115 };
 116
 117 /* tokens of a rule are sorted/handled in this order */
 118 enum token_type {
 119         TK_UNSET,
 120         TK_RULE,
 121
 122         TK_M_ACTION,                    /* val */
 123         TK_M_DEVPATH,                   /* val */
 124         TK_M_KERNEL,                    /* val */
 125         TK_M_DEVLINK,                   /* val */
 126         TK_M_NAME,                      /* val */
 127         TK_M_ENV,                       /* val, attr */
 128         TK_M_TAG,                       /* val */
 129         TK_M_SUBSYSTEM,                 /* val */
 130         TK_M_DRIVER,                    /* val */
 131         TK_M_WAITFOR,                   /* val */
 132         TK_M_ATTR,                      /* val, attr */
 133
 134         TK_M_PARENTS_MIN,
 135         TK_M_KERNELS,                   /* val */
 136         TK_M_SUBSYSTEMS,                /* val */
 137         TK_M_DRIVERS,                   /* val */
 138         TK_M_ATTRS,                     /* val, attr */
 139         TK_M_PARENTS_MAX,
 140
 141         TK_M_TEST,                      /* val, mode_t */
 142         TK_M_EVENT_TIMEOUT,             /* int */
 143         TK_M_PROGRAM,                   /* val */
 144         TK_M_IMPORT_FILE,               /* val */
 145         TK_M_IMPORT_PROG,               /* val */
 146         TK_M_IMPORT_DB,                 /* val */
 147         TK_M_IMPORT_CMDLINE,            /* val */
 148         TK_M_IMPORT_PARENT,             /* val */
 149         TK_M_RESULT,                    /* val */
 150         TK_M_MAX,
 151
 152         TK_A_STRING_ESCAPE_NONE,
 153         TK_A_STRING_ESCAPE_REPLACE,
 154         TK_A_DB_PERSIST,
 155         TK_A_INOTIFY_WATCH,             /* int */
 156         TK_A_DEVLINK_PRIO,              /* int */
 157         TK_A_OWNER,                     /* val */
 158         TK_A_GROUP,                     /* val */
 159         TK_A_MODE,                      /* val */
 160         TK_A_OWNER_ID,                  /* uid_t */
 161         TK_A_GROUP_ID,                  /* gid_t */
 162         TK_A_MODE_ID,                   /* mode_t */
 163         TK_A_STATIC_NODE,               /* val */
 164         TK_A_ENV,                       /* val, attr */
 165         TK_A_TAG,                       /* val */
 166         TK_A_NAME,                      /* val */
 167         TK_A_DEVLINK,                   /* val */
 168         TK_A_ATTR,                      /* val, attr */
 169         TK_A_RUN,                       /* val, bool */
 170         TK_A_GOTO,                      /* size_t */
 171
 172         TK_END,
 173 };
 174
 175 /* we try to pack stuff in a way that we take only 12 bytes per token */
 176 struct token {
 177         union {
 178                 unsigned char type;             /* same in rule and key */
 179                 struct {
 180                         enum token_type type:8;
 181                         bool can_set_name:1;
 182                         bool has_static_node:1;
 183                         unsigned int unused:6;
 184                         unsigned short token_count;
 185                         unsigned int label_off;
 186                         unsigned short filename_off;
 187                         unsigned short filename_line;
 188                 } rule;
 189                 struct {
 190                         enum token_type type:8;
 191                         enum operation_type op:8;
 192                         enum string_glob_type glob:8;
 193                         enum string_subst_type subst:4;
 194                         enum string_subst_type attrsubst:4;
 195                         unsigned int value_off;
 196                         union {
 197                                 unsigned int attr_off;
 198                                 int devlink_unique;
 199                                 int fail_on_error;
 200                                 unsigned int rule_goto;
 201                                 mode_t  mode;
 202                                 uid_t uid;
 203                                 gid_t gid;
 204                                 int devlink_prio;
 205                                 int event_timeout;
 206                                 int watch;
 207                         };
 208                 } key;
 209         };
 210 };
 211
 212 #define MAX_TK          64
 213 struct rule_tmp {
 214         struct udev_rules *rules;
 215         struct token rule;
 216         struct token token[MAX_TK];
 217         unsigned int token_cur;
 218 };
 219
 220 #ifdef ENABLE_DEBUG
 221 static const char *operation_str(enum operation_type type)
 222 {
 223         static const char *operation_strs[] = {
 224                 [OP_UNSET] =            "UNSET",
 225                 [OP_MATCH] =            "match",
 226                 [OP_NOMATCH] =          "nomatch",
 227                 [OP_MATCH_MAX] =        "MATCH_MAX",
 228
 229                 [OP_ADD] =              "add",
 230                 [OP_ASSIGN] =           "assign",
 231                 [OP_ASSIGN_FINAL] =     "assign-final",
 232 }       ;
 233
 234         return operation_strs[type];
 235 }
 236
 237 static const char *string_glob_str(enum string_glob_type type)
 238 {
 239         static const char *string_glob_strs[] = {
 240                 [GL_UNSET] =            "UNSET",
 241                 [GL_PLAIN] =            "plain",
 242                 [GL_GLOB] =             "glob",
 243                 [GL_SPLIT] =            "split",
 244                 [GL_SPLIT_GLOB] =       "split-glob",
 245                 [GL_SOMETHING] =        "split-glob",
 246         };
 247
 248         return string_glob_strs[type];
 249 }
 250
 251 static const char *token_str(enum token_type type)
 252 {
 253         static const char *token_strs[] = {
 254                 [TK_UNSET] =                    "UNSET",
 255                 [TK_RULE] =                     "RULE",
 256
 257                 [TK_M_ACTION] =                 "M ACTION",
 258                 [TK_M_DEVPATH] =                "M DEVPATH",
 259                 [TK_M_KERNEL] =                 "M KERNEL",
 260                 [TK_M_DEVLINK] =                "M DEVLINK",
 261                 [TK_M_NAME] =                   "M NAME",
 262                 [TK_M_ENV] =                    "M ENV",
 263                 [TK_M_TAG] =                    "M TAG",
 264                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 265                 [TK_M_DRIVER] =                 "M DRIVER",
 266                 [TK_M_WAITFOR] =                "M WAITFOR",
 267                 [TK_M_ATTR] =                   "M ATTR",
 268
 269                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 270                 [TK_M_KERNELS] =                "M KERNELS",
 271                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 272                 [TK_M_DRIVERS] =                "M DRIVERS",
 273                 [TK_M_ATTRS] =                  "M ATTRS",
 274                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 275
 276                 [TK_M_TEST] =                   "M TEST",
 277                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 278                 [TK_M_PROGRAM] =                "M PROGRAM",
 279                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 280                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 281                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 282                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 283                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 284                 [TK_M_RESULT] =                 "M RESULT",
 285                 [TK_M_MAX] =                    "M MAX",
 286
 287                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 288                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 289                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 290                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 291                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 292                 [TK_A_OWNER] =                  "A OWNER",
 293                 [TK_A_GROUP] =                  "A GROUP",
 294                 [TK_A_MODE] =                   "A MODE",
 295                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 296                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 297                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 298                 [TK_A_MODE_ID] =                "A MODE_ID",
 299                 [TK_A_ENV] =                    "A ENV",
 300                 [TK_A_TAG] =                    "A ENV",
 301                 [TK_A_NAME] =                   "A NAME",
 302                 [TK_A_DEVLINK] =                "A DEVLINK",
 303                 [TK_A_ATTR] =                   "A ATTR",
 304                 [TK_A_RUN] =                    "A RUN",
 305                 [TK_A_GOTO] =                   "A GOTO",
 306
 307                 [TK_END] =                      "END",
 308         };
 309
 310         return token_strs[type];
 311 }
 312
 313 static void dump_token(struct udev_rules *rules, struct token *token)
 314 {
 315         enum token_type type = token->type;
 316         enum operation_type op = token->key.op;
 317         enum string_glob_type glob = token->key.glob;
 318         const char *value = &rules->buf[token->key.value_off];
 319         const char *attr = &rules->buf[token->key.attr_off];
 320
 321         switch (type) {
 322         case TK_RULE:
 323                 {
 324                         const char *tks_ptr = (char *)rules->tokens;
 325                         const char *tk_ptr = (char *)token;
 326                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 327
 328                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 329                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 330                             idx, token->rule.token_count,
 331                             &rules->buf[token->rule.label_off]);
 332                         break;
 333                 }
 334         case TK_M_ACTION:
 335         case TK_M_DEVPATH:
 336         case TK_M_KERNEL:
 337         case TK_M_SUBSYSTEM:
 338         case TK_M_DRIVER:
 339         case TK_M_WAITFOR:
 340         case TK_M_DEVLINK:
 341         case TK_M_NAME:
 342         case TK_M_KERNELS:
 343         case TK_M_SUBSYSTEMS:
 344         case TK_M_DRIVERS:
 345         case TK_M_PROGRAM:
 346         case TK_M_IMPORT_FILE:
 347         case TK_M_IMPORT_PROG:
 348         case TK_M_IMPORT_DB:
 349         case TK_M_IMPORT_CMDLINE:
 350         case TK_M_IMPORT_PARENT:
 351         case TK_M_RESULT:
 352         case TK_A_NAME:
 353         case TK_A_DEVLINK:
 354         case TK_A_OWNER:
 355         case TK_A_GROUP:
 356         case TK_A_MODE:
 357         case TK_A_RUN:
 358                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 359                     token_str(type), operation_str(op), value, string_glob_str(glob));
 360                 break;
 361         case TK_M_ATTR:
 362         case TK_M_ATTRS:
 363         case TK_M_ENV:
 364         case TK_A_ATTR:
 365         case TK_A_ENV:
 366                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 367                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 368                 break;
 369         case TK_M_TAG:
 370         case TK_A_TAG:
 371                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 372                 break;
 373         case TK_A_STRING_ESCAPE_NONE:
 374         case TK_A_STRING_ESCAPE_REPLACE:
 375         case TK_A_DB_PERSIST:
 376                 dbg(rules->udev, "%s\n", token_str(type));
 377                 break;
 378         case TK_M_TEST:
 379                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 380                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 381                 break;
 382         case TK_A_INOTIFY_WATCH:
 383                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 384                 break;
 385         case TK_A_DEVLINK_PRIO:
 386                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 387                 break;
 388         case TK_A_OWNER_ID:
 389                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 390                 break;
 391         case TK_A_GROUP_ID:
 392                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 393                 break;
 394         case TK_A_MODE_ID:
 395                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 396                 break;
 397         case TK_A_STATIC_NODE:
 398                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 399                 break;
 400         case TK_M_EVENT_TIMEOUT:
 401                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 402                 break;
 403         case TK_A_GOTO:
 404                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 405                 break;
 406         case TK_END:
 407                 dbg(rules->udev, "* %s\n", token_str(type));
 408                 break;
 409         case TK_M_PARENTS_MIN:
 410         case TK_M_PARENTS_MAX:
 411         case TK_M_MAX:
 412         case TK_UNSET:
 413                 dbg(rules->udev, "unknown type %u\n", type);
 414                 break;
 415         }
 416 }
 417
 418 static void dump_rules(struct udev_rules *rules)
 419 {
 420         unsigned int i;
 421
 422         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 423             rules->token_cur,
 424             rules->token_cur * sizeof(struct token),
 425             rules->buf_count,
 426             rules->buf_cur);
 427         for(i = 0; i < rules->token_cur; i++)
 428                 dump_token(rules, &rules->tokens[i]);
 429 }
 430 #else
 431 static inline const char *operation_str(enum operation_type type) { return NULL; }
 432 static inline const char *token_str(enum token_type type) { return NULL; }
 433 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 434 static inline void dump_rules(struct udev_rules *rules) {}
 435 #endif /* ENABLE_DEBUG */
 436
 437 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 438 {
 439         int off;
 440
 441         /* grow buffer if needed */
 442         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 443                 char *buf;
 444                 unsigned int add;
 445
 446                 /* double the buffer size */
 447                 add = rules->buf_max;
 448                 if (add < bytes * 8)
 449                         add = bytes * 8;
 450
 451                 buf = realloc(rules->buf, rules->buf_max + add);
 452                 if (buf == NULL)
 453                         return -1;
 454                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 455                 rules->buf = buf;
 456                 rules->buf_max += add;
 457         }
 458         off = rules->buf_cur;
 459         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 460         rules->buf_cur += bytes;
 461         rules->buf_count++;
 462         return off;
 463 }
 464
 465 static int add_string(struct udev_rules *rules, const char *str)
 466 {
 467         unsigned int node_idx;
 468         struct trie_node *new_node;
 469         unsigned int new_node_idx;
 470         unsigned char key;
 471         unsigned short len;
 472         unsigned int depth;
 473         unsigned int off;
 474         struct trie_node *parent;
 475
 476         /* walk trie, start from last character of str to find matching tails */
 477         len = strlen(str);
 478         key = str[len-1];
 479         node_idx = 0;
 480         for (depth = 0; depth <= len; depth++) {
 481                 struct trie_node *node;
 482                 unsigned int child_idx;
 483
 484                 node = &rules->trie_nodes[node_idx];
 485                 off = node->value_off + node->value_len - len;
 486
 487                 /* match against current node */
 488                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 489                         return off;
 490
 491                 /* lookup child node */
 492                 key = str[len - 1 - depth];
 493                 child_idx = node->child_idx;
 494                 while (child_idx > 0) {
 495                         struct trie_node *child;
 496
 497                         child = &rules->trie_nodes[child_idx];
 498                         if (child->key == key)
 499                                 break;
 500                         child_idx = child->next_child_idx;
 501                 }
 502                 if (child_idx == 0)
 503                         break;
 504                 node_idx = child_idx;
 505         }
 506
 507         /* string not found, add it */
 508         off = add_new_string(rules, str, len + 1);
 509
 510         /* grow trie nodes if needed */
 511         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 512                 struct trie_node *nodes;
 513                 unsigned int add;
 514
 515                 /* double the buffer size */
 516                 add = rules->trie_nodes_max;
 517                 if (add < 8)
 518                         add = 8;
 519
 520                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 521                 if (nodes == NULL)
 522                         return -1;
 523                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 524                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 525                 rules->trie_nodes = nodes;
 526                 rules->trie_nodes_max += add;
 527         }
 528
 529         /* get a new node */
 530         new_node_idx = rules->trie_nodes_cur;
 531         rules->trie_nodes_cur++;
 532         new_node = &rules->trie_nodes[new_node_idx];
 533         memset(new_node, 0x00, sizeof(struct trie_node));
 534         new_node->value_off = off;
 535         new_node->value_len = len;
 536         new_node->key = key;
 537
 538         /* join the parent's child list */
 539         parent = &rules->trie_nodes[node_idx];
 540         if (parent->child_idx == 0) {
 541                 parent->child_idx = new_node_idx;
 542         } else {
 543                 struct trie_node *last_child;
 544
 545                 last_child = &rules->trie_nodes[parent->last_child_idx];
 546                 last_child->next_child_idx = new_node_idx;
 547         }
 548         parent->last_child_idx = new_node_idx;
 549         return off;
 550 }
 551
 552 static int add_token(struct udev_rules *rules, struct token *token)
 553 {
 554         /* grow buffer if needed */
 555         if (rules->token_cur+1 >= rules->token_max) {
 556                 struct token *tokens;
 557                 unsigned int add;
 558
 559                 /* double the buffer size */
 560                 add = rules->token_max;
 561                 if (add < 8)
 562                         add = 8;
 563
 564                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 565                 if (tokens == NULL)
 566                         return -1;
 567                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 568                 rules->tokens = tokens;
 569                 rules->token_max += add;
 570         }
 571         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 572         rules->token_cur++;
 573         return 0;
 574 }
 575
 576 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 577 {
 578         unsigned int i;
 579         uid_t uid;
 580         unsigned int off;
 581
 582         /* lookup, if we know it already */
 583         for (i = 0; i < rules->uids_cur; i++) {
 584                 off = rules->uids[i].name_off;
 585                 if (strcmp(&rules->buf[off], owner) == 0) {
 586                         uid = rules->uids[i].uid;
 587                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 588                         return uid;
 589                 }
 590         }
 591         uid = util_lookup_user(rules->udev, owner);
 592
 593         /* grow buffer if needed */
 594         if (rules->uids_cur+1 >= rules->uids_max) {
 595                 struct uid_gid *uids;
 596                 unsigned int add;
 597
 598                 /* double the buffer size */
 599                 add = rules->uids_max;
 600                 if (add < 1)
 601                         add = 8;
 602
 603                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 604                 if (uids == NULL)
 605                         return uid;
 606                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 607                 rules->uids = uids;
 608                 rules->uids_max += add;
 609         }
 610         rules->uids[rules->uids_cur].uid = uid;
 611         off = add_string(rules, owner);
 612         if (off <= 0)
 613                 return uid;
 614         rules->uids[rules->uids_cur].name_off = off;
 615         rules->uids_cur++;
 616         return uid;
 617 }
 618
 619 static gid_t add_gid(struct udev_rules *rules, const char *group)
 620 {
 621         unsigned int i;
 622         gid_t gid;
 623         unsigned int off;
 624
 625         /* lookup, if we know it already */
 626         for (i = 0; i < rules->gids_cur; i++) {
 627                 off = rules->gids[i].name_off;
 628                 if (strcmp(&rules->buf[off], group) == 0) {
 629                         gid = rules->gids[i].gid;
 630                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 631                         return gid;
 632                 }
 633         }
 634         gid = util_lookup_group(rules->udev, group);
 635
 636         /* grow buffer if needed */
 637         if (rules->gids_cur+1 >= rules->gids_max) {
 638                 struct uid_gid *gids;
 639                 unsigned int add;
 640
 641                 /* double the buffer size */
 642                 add = rules->gids_max;
 643                 if (add < 1)
 644                         add = 8;
 645
 646                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 647                 if (gids == NULL)
 648                         return gid;
 649                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 650                 rules->gids = gids;
 651                 rules->gids_max += add;
 652         }
 653         rules->gids[rules->gids_cur].gid = gid;
 654         off = add_string(rules, group);
 655         if (off <= 0)
 656                 return gid;
 657         rules->gids[rules->gids_cur].name_off = off;
 658         rules->gids_cur++;
 659         return gid;
 660 }
 661
 662 static int import_property_from_string(struct udev_device *dev, char *line)
 663 {
 664         struct udev *udev = udev_device_get_udev(dev);
 665         char *key;
 666         char *val;
 667         size_t len;
 668
 669         /* find key */
 670         key = line;
 671         while (isspace(key[0]))
 672                 key++;
 673
 674         /* comment or empty line */
 675         if (key[0] == '#' || key[0] == '\0')
 676                 return -1;
 677
 678         /* split key/value */
 679         val = strchr(key, '=');
 680         if (val == NULL)
 681                 return -1;
 682         val[0] = '\0';
 683         val++;
 684
 685         /* find value */
 686         while (isspace(val[0]))
 687                 val++;
 688
 689         /* terminate key */
 690         len = strlen(key);
 691         if (len == 0)
 692                 return -1;
 693         while (isspace(key[len-1]))
 694                 len--;
 695         key[len] = '\0';
 696
 697         /* terminate value */
 698         len = strlen(val);
 699         if (len == 0)
 700                 return -1;
 701         while (isspace(val[len-1]))
 702                 len--;
 703         val[len] = '\0';
 704
 705         if (len == 0)
 706                 return -1;
 707
 708         /* unquote */
 709         if (val[0] == '"' || val[0] == '\'') {
 710                 if (val[len-1] != val[0]) {
 711                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 712                         return -1;
 713                 }
 714                 val[len-1] = '\0';
 715                 val++;
 716         }
 717
 718         dbg(udev, "adding '%s'='%s'\n", key, val);
 719
 720         /* handle device, renamed by external tool, returning new path */
 721         if (strcmp(key, "DEVPATH") == 0) {
 722                 char syspath[UTIL_PATH_SIZE];
 723
 724                 info(udev, "updating devpath from '%s' to '%s'\n",
 725                      udev_device_get_devpath(dev), val);
 726                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 727                 udev_device_set_syspath(dev, syspath);
 728         } else {
 729                 struct udev_list_entry *entry;
 730
 731                 entry = udev_device_add_property(dev, key, val);
 732                 /* store in db, skip private keys */
 733                 if (key[0] != '.')
 734                         udev_list_entry_set_num(entry, true);
 735         }
 736         return 0;
 737 }
 738
 739 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 740 {
 741         FILE *f;
 742         char line[UTIL_LINE_SIZE];
 743
 744         f = fopen(filename, "r");
 745         if (f == NULL)
 746                 return -1;
 747         while (fgets(line, sizeof(line), f) != NULL)
 748                 import_property_from_string(dev, line);
 749         fclose(f);
 750         return 0;
 751 }
 752
 753 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 754 {
 755         struct udev_device *dev = event->dev;
 756         char **envp;
 757         char result[UTIL_LINE_SIZE];
 758         char *line;
 759         int err;
 760
 761         envp = udev_device_get_properties_envp(dev);
 762         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 763         if (err < 0)
 764                 return err;
 765
 766         line = result;
 767         while (line != NULL) {
 768                 char *pos;
 769
 770                 pos = strchr(line, '\n');
 771                 if (pos != NULL) {
 772                         pos[0] = '\0';
 773                         pos = &pos[1];
 774                 }
 775                 import_property_from_string(dev, line);
 776                 line = pos;
 777         }
 778         return 0;
 779 }
 780
 781 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 782 {
 783         struct udev *udev = udev_device_get_udev(dev);
 784         struct udev_device *dev_parent;
 785         struct udev_list_entry *list_entry;
 786
 787         dev_parent = udev_device_get_parent(dev);
 788         if (dev_parent == NULL)
 789                 return -1;
 790
 791         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 792         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 793                 const char *key = udev_list_entry_get_name(list_entry);
 794                 const char *val = udev_list_entry_get_value(list_entry);
 795
 796                 if (fnmatch(filter, key, 0) == 0) {
 797                         struct udev_list_entry *entry;
 798
 799                         dbg(udev, "import key '%s=%s'\n", key, val);
 800                         entry = udev_device_add_property(dev, key, val);
 801                         /* store in db, skip private keys */
 802                         if (key[0] != '.')
 803                                 udev_list_entry_set_num(entry, true);
 804                 }
 805         }
 806         return 0;
 807 }
 808
 809 #define WAIT_LOOP_PER_SECOND            50
 810 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 811 {
 812         struct udev *udev = udev_device_get_udev(dev);
 813         char filepath[UTIL_PATH_SIZE];
 814         char devicepath[UTIL_PATH_SIZE];
 815         struct stat stats;
 816         int loop = timeout * WAIT_LOOP_PER_SECOND;
 817
 818         /* a relative path is a device attribute */
 819         devicepath[0] = '\0';
 820         if (file[0] != '/') {
 821                 util_strscpyl(devicepath, sizeof(devicepath),
 822                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 823                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 824                 file = filepath;
 825         }
 826
 827         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 828         while (--loop) {
 829                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 830
 831                 /* lookup file */
 832                 if (stat(file, &stats) == 0) {
 833                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 834                         return 0;
 835                 }
 836                 /* make sure, the device did not disappear in the meantime */
 837                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 838                         info(udev, "device disappeared while waiting for '%s'\n", file);
 839                         return -2;
 840                 }
 841                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 842                 nanosleep(&duration, NULL);
 843         }
 844         info(udev, "waiting for '%s' failed\n", file);
 845         return -1;
 846 }
 847
 848 static int attr_subst_subdir(char *attr, size_t len)
 849 {
 850         bool found = false;
 851
 852         if (strstr(attr, "/*/")) {
 853                 char *pos;
 854                 char dirname[UTIL_PATH_SIZE];
 855                 const char *tail;
 856                 DIR *dir;
 857
 858                 util_strscpy(dirname, sizeof(dirname), attr);
 859                 pos = strstr(dirname, "/*/");
 860                 if (pos == NULL)
 861                         return -1;
 862                 pos[0] = '\0';
 863                 tail = &pos[2];
 864                 dir = opendir(dirname);
 865                 if (dir != NULL) {
 866                         struct dirent *dent;
 867
 868                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 869                                 struct stat stats;
 870
 871                                 if (dent->d_name[0] == '.')
 872                                         continue;
 873                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 874                                 if (stat(attr, &stats) == 0) {
 875                                         found = true;
 876                                         break;
 877                                 }
 878                         }
 879                         closedir(dir);
 880                 }
 881         }
 882
 883         return found;
 884 }
 885
 886 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 887 {
 888         char *linepos;
 889         char *temp;
 890
 891         linepos = *line;
 892         if (linepos == NULL || linepos[0] == '\0')
 893                 return -1;
 894
 895         /* skip whitespace */
 896         while (isspace(linepos[0]) || linepos[0] == ',')
 897                 linepos++;
 898
 899         /* get the key */
 900         if (linepos[0] == '\0')
 901                 return -1;
 902         *key = linepos;
 903
 904         for (;;) {
 905                 linepos++;
 906                 if (linepos[0] == '\0')
 907                         return -1;
 908                 if (isspace(linepos[0]))
 909                         break;
 910                 if (linepos[0] == '=')
 911                         break;
 912                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 913                         if (linepos[1] == '=')
 914                                 break;
 915         }
 916
 917         /* remember end of key */
 918         temp = linepos;
 919
 920         /* skip whitespace after key */
 921         while (isspace(linepos[0]))
 922                 linepos++;
 923         if (linepos[0] == '\0')
 924                 return -1;
 925
 926         /* get operation type */
 927         if (linepos[0] == '=' && linepos[1] == '=') {
 928                 *op = OP_MATCH;
 929                 linepos += 2;
 930         } else if (linepos[0] == '!' && linepos[1] == '=') {
 931                 *op = OP_NOMATCH;
 932                 linepos += 2;
 933         } else if (linepos[0] == '+' && linepos[1] == '=') {
 934                 *op = OP_ADD;
 935                 linepos += 2;
 936         } else if (linepos[0] == '=') {
 937                 *op = OP_ASSIGN;
 938                 linepos++;
 939         } else if (linepos[0] == ':' && linepos[1] == '=') {
 940                 *op = OP_ASSIGN_FINAL;
 941                 linepos += 2;
 942         } else
 943                 return -1;
 944
 945         /* terminate key */
 946         temp[0] = '\0';
 947
 948         /* skip whitespace after operator */
 949         while (isspace(linepos[0]))
 950                 linepos++;
 951         if (linepos[0] == '\0')
 952                 return -1;
 953
 954         /* get the value */
 955         if (linepos[0] == '"')
 956                 linepos++;
 957         else
 958                 return -1;
 959         *value = linepos;
 960
 961         /* terminate */
 962         temp = strchr(linepos, '"');
 963         if (!temp)
 964                 return -1;
 965         temp[0] = '\0';
 966         temp++;
 967         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 968
 969         /* move line to next key */
 970         *line = temp;
 971         return 0;
 972 }
 973
 974 /* extract possible KEY{attr} */
 975 static char *get_key_attribute(struct udev *udev, char *str)
 976 {
 977         char *pos;
 978         char *attr;
 979
 980         attr = strchr(str, '{');
 981         if (attr != NULL) {
 982                 attr++;
 983                 pos = strchr(attr, '}');
 984                 if (pos == NULL) {
 985                         err(udev, "missing closing brace for format\n");
 986                         return NULL;
 987                 }
 988                 pos[0] = '\0';
 989                 dbg(udev, "attribute='%s'\n", attr);
 990                 return attr;
 991         }
 992         return NULL;
 993 }
 994
 995 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 996                         enum operation_type op,
 997                         const char *value, const void *data)
 998 {
 999         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
1000         const char *attr = NULL;
1001
1002         memset(token, 0x00, sizeof(struct token));
1003
1004         switch (type) {
1005         case TK_M_ACTION:
1006         case TK_M_DEVPATH:
1007         case TK_M_KERNEL:
1008         case TK_M_SUBSYSTEM:
1009         case TK_M_DRIVER:
1010         case TK_M_WAITFOR:
1011         case TK_M_DEVLINK:
1012         case TK_M_NAME:
1013         case TK_M_KERNELS:
1014         case TK_M_SUBSYSTEMS:
1015         case TK_M_DRIVERS:
1016         case TK_M_PROGRAM:
1017         case TK_M_IMPORT_FILE:
1018         case TK_M_IMPORT_PROG:
1019         case TK_M_IMPORT_DB:
1020         case TK_M_IMPORT_CMDLINE:
1021         case TK_M_IMPORT_PARENT:
1022         case TK_M_RESULT:
1023         case TK_A_OWNER:
1024         case TK_A_GROUP:
1025         case TK_A_MODE:
1026         case TK_A_NAME:
1027         case TK_A_GOTO:
1028         case TK_M_TAG:
1029         case TK_A_TAG:
1030                 token->key.value_off = add_string(rule_tmp->rules, value);
1031                 break;
1032         case TK_M_ENV:
1033         case TK_M_ATTR:
1034         case TK_M_ATTRS:
1035         case TK_A_ATTR:
1036         case TK_A_ENV:
1037                 attr = data;
1038                 token->key.value_off = add_string(rule_tmp->rules, value);
1039                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1040                 break;
1041         case TK_A_DEVLINK:
1042                 token->key.value_off = add_string(rule_tmp->rules, value);
1043                 token->key.devlink_unique = *(int *)data;
1044                 break;
1045         case TK_M_TEST:
1046                 token->key.value_off = add_string(rule_tmp->rules, value);
1047                 if (data != NULL)
1048                         token->key.mode = *(mode_t *)data;
1049                 break;
1050         case TK_A_STRING_ESCAPE_NONE:
1051         case TK_A_STRING_ESCAPE_REPLACE:
1052         case TK_A_DB_PERSIST:
1053                 break;
1054         case TK_A_RUN:
1055                 token->key.value_off = add_string(rule_tmp->rules, value);
1056                 token->key.fail_on_error = *(int *)data;
1057                 break;
1058         case TK_A_INOTIFY_WATCH:
1059         case TK_A_DEVLINK_PRIO:
1060                 token->key.devlink_prio = *(int *)data;
1061                 break;
1062         case TK_A_OWNER_ID:
1063                 token->key.uid = *(uid_t *)data;
1064                 break;
1065         case TK_A_GROUP_ID:
1066                 token->key.gid = *(gid_t *)data;
1067                 break;
1068         case TK_A_MODE_ID:
1069                 token->key.mode = *(mode_t *)data;
1070                 break;
1071         case TK_A_STATIC_NODE:
1072                 token->key.value_off = add_string(rule_tmp->rules, value);
1073                 break;
1074         case TK_M_EVENT_TIMEOUT:
1075                 token->key.event_timeout = *(int *)data;
1076                 break;
1077         case TK_RULE:
1078         case TK_M_PARENTS_MIN:
1079         case TK_M_PARENTS_MAX:
1080         case TK_M_MAX:
1081         case TK_END:
1082         case TK_UNSET:
1083                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1084                 return -1;
1085         }
1086
1087         if (value != NULL && type < TK_M_MAX) {
1088                 /* check if we need to split or call fnmatch() while matching rules */
1089                 enum string_glob_type glob;
1090                 int has_split;
1091                 int has_glob;
1092
1093                 has_split = (strchr(value, '|') != NULL);
1094                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1095                 if (has_split && has_glob) {
1096                         glob = GL_SPLIT_GLOB;
1097                 } else if (has_split) {
1098                         glob = GL_SPLIT;
1099                 } else if (has_glob) {
1100                         if (strcmp(value, "?*") == 0)
1101                                 glob = GL_SOMETHING;
1102                         else
1103                                 glob = GL_GLOB;
1104                 } else {
1105                         glob = GL_PLAIN;
1106                 }
1107                 token->key.glob = glob;
1108         }
1109
1110         if (value != NULL && type > TK_M_MAX) {
1111                 /* check if assigned value has substitution chars */
1112                 if (value[0] == '[')
1113                         token->key.subst = SB_SUBSYS;
1114                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1115                         token->key.subst = SB_FORMAT;
1116                 else
1117                         token->key.subst = SB_NONE;
1118         }
1119
1120         if (attr != NULL) {
1121                 /* check if property/attribut name has substitution chars */
1122                 if (attr[0] == '[')
1123                         token->key.attrsubst = SB_SUBSYS;
1124                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1125                         token->key.attrsubst = SB_FORMAT;
1126                 else
1127                         token->key.attrsubst = SB_NONE;
1128         }
1129
1130         token->key.type = type;
1131         token->key.op = op;
1132         rule_tmp->token_cur++;
1133         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1134                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1135                 return -1;
1136         }
1137         return 0;
1138 }
1139
1140 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1141 {
1142         unsigned int i;
1143         unsigned int start = 0;
1144         unsigned int end = rule_tmp->token_cur;
1145
1146         for (i = 0; i < rule_tmp->token_cur; i++) {
1147                 enum token_type next_val = TK_UNSET;
1148                 unsigned int next_idx = 0;
1149                 unsigned int j;
1150
1151                 /* find smallest value */
1152                 for (j = start; j < end; j++) {
1153                         if (rule_tmp->token[j].type == TK_UNSET)
1154                                 continue;
1155                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1156                                 next_val = rule_tmp->token[j].type;
1157                                 next_idx = j;
1158                         }
1159                 }
1160
1161                 /* add token and mark done */
1162                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1163                         return -1;
1164                 rule_tmp->token[next_idx].type = TK_UNSET;
1165
1166                 /* shrink range */
1167                 if (next_idx == start)
1168                         start++;
1169                 if (next_idx+1 == end)
1170                         end--;
1171         }
1172         return 0;
1173 }
1174
1175 static int add_rule(struct udev_rules *rules, char *line,
1176                     const char *filename, unsigned int filename_off, unsigned int lineno)
1177 {
1178         char *linepos;
1179         char *attr;
1180         struct rule_tmp rule_tmp;
1181         bool bus_warn = false;
1182         bool sysfs_warn = false;
1183         bool id_warn = false;
1184
1185         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1186         rule_tmp.rules = rules;
1187         rule_tmp.rule.type = TK_RULE;
1188         rule_tmp.rule.rule.filename_off = filename_off;
1189         rule_tmp.rule.rule.filename_line = lineno;
1190
1191         linepos = line;
1192         for (;;) {
1193                 char *key;
1194                 char *value;
1195                 enum operation_type op;
1196
1197                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1198                         break;
1199
1200                 if (strcmp(key, "ACTION") == 0) {
1201                         if (op > OP_MATCH_MAX) {
1202                                 err(rules->udev, "invalid ACTION operation\n");
1203                                 goto invalid;
1204                         }
1205                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1206                         continue;
1207                 }
1208
1209                 if (strcmp(key, "DEVPATH") == 0) {
1210                         if (op > OP_MATCH_MAX) {
1211                                 err(rules->udev, "invalid DEVPATH operation\n");
1212                                 goto invalid;
1213                         }
1214                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1215                         continue;
1216                 }
1217
1218                 if (strcmp(key, "KERNEL") == 0) {
1219                         if (op > OP_MATCH_MAX) {
1220                                 err(rules->udev, "invalid KERNEL operation\n");
1221                                 goto invalid;
1222                         }
1223                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1224                         continue;
1225                 }
1226
1227                 if (strcmp(key, "SUBSYSTEM") == 0) {
1228                         if (op > OP_MATCH_MAX) {
1229                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1230                                 goto invalid;
1231                         }
1232                         /* bus, class, subsystem events should all be the same */
1233                         if (strcmp(value, "subsystem") == 0 ||
1234                             strcmp(value, "bus") == 0 ||
1235                             strcmp(value, "class") == 0) {
1236                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1237                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1238                                             "please fix it in %s:%u", value, filename, lineno);
1239                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1240                         } else
1241                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1242                         continue;
1243                 }
1244
1245                 if (strcmp(key, "DRIVER") == 0) {
1246                         if (op > OP_MATCH_MAX) {
1247                                 err(rules->udev, "invalid DRIVER operation\n");
1248                                 goto invalid;
1249                         }
1250                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1251                         continue;
1252                 }
1253
1254                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1255                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1256                         if (attr == NULL) {
1257                                 err(rules->udev, "error parsing ATTR attribute\n");
1258                                 goto invalid;
1259                         }
1260                         if (op < OP_MATCH_MAX) {
1261                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1262                         } else {
1263                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1264                         }
1265                         continue;
1266                 }
1267
1268                 if (strcmp(key, "KERNELS") == 0) {
1269                         if (op > OP_MATCH_MAX) {
1270                                 err(rules->udev, "invalid KERNELS operation\n");
1271                                 goto invalid;
1272                         }
1273                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1274                         continue;
1275                 }
1276
1277                 if (strcmp(key, "ID") == 0) {
1278                         if (!id_warn) {
1279                                 id_warn = true;
1280                                 err(rules->udev, "ID= will be removed in a future udev version, "
1281                                     "please use KERNEL= to match the event device, or KERNELS= "
1282                                     "to match a parent device, in %s:%u\n", filename, lineno);
1283                         }
1284                         if (op > OP_MATCH_MAX) {
1285                                 err(rules->udev, "invalid KERNELS operation\n");
1286                                 goto invalid;
1287                         }
1288                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1289                         continue;
1290                 }
1291
1292                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1293                         if (op > OP_MATCH_MAX) {
1294                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1295                                 goto invalid;
1296                         }
1297                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1298                         continue;
1299                 }
1300
1301                 if (strcmp(key, "BUS") == 0) {
1302                         if (!bus_warn) {
1303                                 bus_warn = true;
1304                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1305                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1306                                     "to match a parent device, in %s:%u\n", filename, lineno);
1307                         }
1308                         if (op > OP_MATCH_MAX) {
1309                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1310                                 goto invalid;
1311                         }
1312                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1313                         continue;
1314                 }
1315
1316                 if (strcmp(key, "DRIVERS") == 0) {
1317                         if (op > OP_MATCH_MAX) {
1318                                 err(rules->udev, "invalid DRIVERS operation\n");
1319                                 goto invalid;
1320                         }
1321                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1322                         continue;
1323                 }
1324
1325                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1326                         if (op > OP_MATCH_MAX) {
1327                                 err(rules->udev, "invalid ATTRS operation\n");
1328                                 goto invalid;
1329                         }
1330                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1331                         if (attr == NULL) {
1332                                 err(rules->udev, "error parsing ATTRS attribute\n");
1333                                 goto invalid;
1334                         }
1335                         if (strncmp(attr, "device/", 7) == 0)
1336                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1337                                     "please fix it in %s:%u", filename, lineno);
1338                         else if (strstr(attr, "../") != NULL)
1339                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1340                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1341                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1342                         continue;
1343                 }
1344
1345                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1346                         if (!sysfs_warn) {
1347                                 sysfs_warn = true;
1348                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1349                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1350                                     "to match a parent device, in %s:%u\n", filename, lineno);
1351                         }
1352                         if (op > OP_MATCH_MAX) {
1353                                 err(rules->udev, "invalid ATTRS operation\n");
1354                                 goto invalid;
1355                         }
1356                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1357                         if (attr == NULL) {
1358                                 err(rules->udev, "error parsing ATTRS attribute\n");
1359                                 goto invalid;
1360                         }
1361                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1362                         continue;
1363                 }
1364
1365                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1366                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1367                         if (attr == NULL) {
1368                                 err(rules->udev, "error parsing ENV attribute\n");
1369                                 goto invalid;
1370                         }
1371                         if (op < OP_MATCH_MAX) {
1372                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1373                                         goto invalid;
1374                         } else {
1375                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1376                                         goto invalid;
1377                         }
1378                         continue;
1379                 }
1380
1381                 if (strcmp(key, "TAG") == 0) {
1382                         if (op < OP_MATCH_MAX)
1383                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1384                         else
1385                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1386                         continue;
1387                 }
1388
1389                 if (strcmp(key, "PROGRAM") == 0) {
1390                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1391                         continue;
1392                 }
1393
1394                 if (strcmp(key, "RESULT") == 0) {
1395                         if (op > OP_MATCH_MAX) {
1396                                 err(rules->udev, "invalid RESULT operation\n");
1397                                 goto invalid;
1398                         }
1399                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1400                         continue;
1401                 }
1402
1403                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1404                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1405                         if (attr != NULL && strstr(attr, "program")) {
1406                                 dbg(rules->udev, "IMPORT will be executed\n");
1407                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1408                         } else if (attr != NULL && strstr(attr, "file")) {
1409                                 dbg(rules->udev, "IMPORT will be included as file\n");
1410                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1411                         } else if (attr != NULL && strstr(attr, "db")) {
1412                                 dbg(rules->udev, "IMPORT will include db values\n");
1413                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1414                         } else if (attr != NULL && strstr(attr, "cmdline")) {
1415                                 dbg(rules->udev, "IMPORT will include db values\n");
1416                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1417                         } else if (attr != NULL && strstr(attr, "parent")) {
1418                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1419                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1420                         } else {
1421                                 /* figure it out if it is executable */
1422                                 char file[UTIL_PATH_SIZE];
1423                                 char *pos;
1424                                 struct stat statbuf;
1425
1426                                 /* allow programs in /lib/udev called without the path */
1427                                 if (value[0] != '/')
1428                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1429                                 else
1430                                         util_strscpy(file, sizeof(file), value);
1431                                 pos = strchr(file, ' ');
1432                                 if (pos)
1433                                         pos[0] = '\0';
1434                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1435                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1436                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1437                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1438                                 } else {
1439                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1440                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1441                                 }
1442                         }
1443                         continue;
1444                 }
1445
1446                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1447                         mode_t mode = 0;
1448
1449                         if (op > OP_MATCH_MAX) {
1450                                 err(rules->udev, "invalid TEST operation\n");
1451                                 goto invalid;
1452                         }
1453                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1454                         if (attr != NULL) {
1455                                 mode = strtol(attr, NULL, 8);
1456                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1457                         } else {
1458                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1459                         }
1460                         continue;
1461                 }
1462
1463                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1464                         int flag = 0;
1465
1466                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1467                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1468                                 flag = 1;
1469                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1470                         continue;
1471                 }
1472
1473                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1474                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1475                         continue;
1476                 }
1477
1478                 if (strcmp(key, "LABEL") == 0) {
1479                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1480                         continue;
1481                 }
1482
1483                 if (strcmp(key, "GOTO") == 0) {
1484                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1485                         continue;
1486                 }
1487
1488                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1489                         if (op < OP_MATCH_MAX) {
1490                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1491                         } else {
1492                                 if (strcmp(value, "%k") == 0) {
1493                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1494                                             "please remove it from %s:%u\n", filename, lineno);
1495                                         continue;
1496                                 }
1497                                 if (value[0] == '\0') {
1498                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1499                                              "please remove it from %s:%u\n", filename, lineno);
1500                                         continue;
1501                                 }
1502                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1503                         }
1504                         rule_tmp.rule.rule.can_set_name = true;
1505                         continue;
1506                 }
1507
1508                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1509                         if (op < OP_MATCH_MAX) {
1510                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1511                         } else {
1512                                 int flag = 0;
1513
1514                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1515                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1516                                         flag = 1;
1517                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1518                         }
1519                         rule_tmp.rule.rule.can_set_name = true;
1520                         continue;
1521                 }
1522
1523                 if (strcmp(key, "OWNER") == 0) {
1524                         uid_t uid;
1525                         char *endptr;
1526
1527                         uid = strtoul(value, &endptr, 10);
1528                         if (endptr[0] == '\0') {
1529                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1530                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1531                                 uid = add_uid(rules, value);
1532                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1533                         } else if (rules->resolve_names >= 0) {
1534                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1535                         }
1536                         rule_tmp.rule.rule.can_set_name = true;
1537                         continue;
1538                 }
1539
1540                 if (strcmp(key, "GROUP") == 0) {
1541                         gid_t gid;
1542                         char *endptr;
1543
1544                         gid = strtoul(value, &endptr, 10);
1545                         if (endptr[0] == '\0') {
1546                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1547                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1548                                 gid = add_gid(rules, value);
1549                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1550                         } else if (rules->resolve_names >= 0) {
1551                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1552                         }
1553                         rule_tmp.rule.rule.can_set_name = true;
1554                         continue;
1555                 }
1556
1557                 if (strcmp(key, "MODE") == 0) {
1558                         mode_t mode;
1559                         char *endptr;
1560
1561                         mode = strtol(value, &endptr, 8);
1562                         if (endptr[0] == '\0')
1563                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1564                         else
1565                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1566                         rule_tmp.rule.rule.can_set_name = true;
1567                         continue;
1568                 }
1569
1570                 if (strcmp(key, "OPTIONS") == 0) {
1571                         const char *pos;
1572
1573                         pos = strstr(value, "link_priority=");
1574                         if (pos != NULL) {
1575                                 int prio = atoi(&pos[strlen("link_priority=")]);
1576
1577                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1578                                 dbg(rules->udev, "link priority=%i\n", prio);
1579                         }
1580
1581                         pos = strstr(value, "event_timeout=");
1582                         if (pos != NULL) {
1583                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1584
1585                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1586                                 dbg(rules->udev, "event timeout=%i\n", tout);
1587                         }
1588
1589                         pos = strstr(value, "string_escape=");
1590                         if (pos != NULL) {
1591                                 pos = &pos[strlen("string_escape=")];
1592                                 if (strncmp(pos, "none", strlen("none")) == 0)
1593                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1594                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1595                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1596                         }
1597
1598                         pos = strstr(value, "db_persist");
1599                         if (pos != NULL)
1600                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1601
1602                         pos = strstr(value, "nowatch");
1603                         if (pos != NULL) {
1604                                 const int off = 0;
1605
1606                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1607                                 dbg(rules->udev, "inotify watch of device disabled\n");
1608                         } else {
1609                                 pos = strstr(value, "watch");
1610                                 if (pos != NULL) {
1611                                         const int on = 1;
1612
1613                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1614                                         dbg(rules->udev, "inotify watch of device requested\n");
1615                                 }
1616                         }
1617
1618                         pos = strstr(value, "static_node=");
1619                         if (pos != NULL) {
1620                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1621                                 rule_tmp.rule.rule.has_static_node = true;
1622                         }
1623
1624                         continue;
1625                 }
1626                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1627         }
1628
1629         /* add rule token */
1630         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1631         if (add_token(rules, &rule_tmp.rule) != 0)
1632                 goto invalid;
1633
1634         /* add tokens to list, sorted by type */
1635         if (sort_token(rules, &rule_tmp) != 0)
1636                 goto invalid;
1637
1638         return 0;
1639 invalid:
1640         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1641         return -1;
1642 }
1643
1644 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1645 {
1646         FILE *f;
1647         unsigned int first_token;
1648         char line[UTIL_LINE_SIZE];
1649         int line_nr = 0;
1650         unsigned int i;
1651
1652         info(rules->udev, "reading '%s' as rules file\n", filename);
1653
1654         f = fopen(filename, "r");
1655         if (f == NULL)
1656                 return -1;
1657
1658         first_token = rules->token_cur;
1659
1660         while (fgets(line, sizeof(line), f) != NULL) {
1661                 char *key;
1662                 size_t len;
1663
1664                 /* skip whitespace */
1665                 line_nr++;
1666                 key = line;
1667                 while (isspace(key[0]))
1668                         key++;
1669
1670                 /* comment */
1671                 if (key[0] == '#')
1672                         continue;
1673
1674                 len = strlen(line);
1675                 if (len < 3)
1676                         continue;
1677
1678                 /* continue reading if backslash+newline is found */
1679                 while (line[len-2] == '\\') {
1680                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1681                                 break;
1682                         if (strlen(&line[len-2]) < 2)
1683                                 break;
1684                         line_nr++;
1685                         len = strlen(line);
1686                 }
1687
1688                 if (len+1 >= sizeof(line)) {
1689                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1690                         continue;
1691                 }
1692                 add_rule(rules, key, filename, filename_off, line_nr);
1693         }
1694         fclose(f);
1695
1696         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1697         for (i = first_token+1; i < rules->token_cur; i++) {
1698                 if (rules->tokens[i].type == TK_A_GOTO) {
1699                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1700                         unsigned int j;
1701
1702                         for (j = i+1; j < rules->token_cur; j++) {
1703                                 if (rules->tokens[j].type != TK_RULE)
1704                                         continue;
1705                                 if (rules->tokens[j].rule.label_off == 0)
1706                                         continue;
1707                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1708                                         continue;
1709                                 rules->tokens[i].key.rule_goto = j;
1710                                 break;
1711                         }
1712                         if (rules->tokens[i].key.rule_goto == 0)
1713                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1714                 }
1715         }
1716         return 0;
1717 }
1718
1719 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1720 {
1721         DIR *dir;
1722         struct dirent *dent;
1723         char filename[UTIL_PATH_SIZE];
1724
1725         dbg(udev, "open directory '%s'\n", dirname);
1726         dir = opendir(dirname);
1727         if (dir == NULL) {
1728                 info(udev, "unable to open '%s': %m\n", dirname);
1729                 return -1;
1730         }
1731
1732         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1733                 if (dent->d_name[0] == '.')
1734                         continue;
1735
1736                 /* look for file matching with specified suffix */
1737                 if (suffix != NULL) {
1738                         const char *ext;
1739
1740                         ext = strrchr(dent->d_name, '.');
1741                         if (ext == NULL)
1742                                 continue;
1743                         if (strcmp(ext, suffix) != 0)
1744                                 continue;
1745                 }
1746                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1747                 dbg(udev, "put file '%s' into list\n", filename);
1748                 /*
1749                  * the basename is the key, the filename the value
1750                  * identical basenames from different directories overwrite each other
1751                  * entries are sorted after basename
1752                  */
1753                 udev_list_entry_add(udev, file_list, dent->d_name, filename, UDEV_LIST_UNIQUE|UDEV_LIST_SORT);
1754         }
1755
1756         closedir(dir);
1757         return 0;
1758 }
1759
1760 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1761 {
1762         struct udev_rules *rules;
1763         struct udev_list_node file_list;
1764         struct udev_list_entry *file_loop;
1765         struct token end_token;
1766
1767         rules = calloc(1, sizeof(struct udev_rules));
1768         if (rules == NULL)
1769                 return NULL;
1770         rules->udev = udev;
1771         rules->resolve_names = resolve_names;
1772         udev_list_init(&file_list);
1773
1774         /* init token array and string buffer */
1775         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1776         if (rules->tokens == NULL) {
1777                 free(rules);
1778                 return NULL;
1779         }
1780         rules->token_max = PREALLOC_TOKEN;
1781
1782         rules->buf = malloc(PREALLOC_STRBUF);
1783         if (rules->buf == NULL) {
1784                 free(rules->tokens);
1785                 free(rules);
1786                 return NULL;
1787         }
1788         rules->buf_max = PREALLOC_STRBUF;
1789         /* offset 0 is always '\0' */
1790         rules->buf[0] = '\0';
1791         rules->buf_cur = 1;
1792         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1793             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1794
1795         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1796         if (rules->trie_nodes == NULL) {
1797                 free(rules->buf);
1798                 free(rules->tokens);
1799                 free(rules);
1800                 return NULL;
1801         }
1802         rules->trie_nodes_max = PREALLOC_TRIE;
1803         /* offset 0 is the trie root, with an empty string */
1804         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1805         rules->trie_nodes_cur = 1;
1806
1807         if (udev_get_rules_path(udev) == NULL) {
1808                 char filename[UTIL_PATH_SIZE];
1809
1810                 /* /lib/udev -- default/package rules */
1811                 add_matching_files(udev, &file_list, LIBEXECDIR "/rules.d", ".rules");
1812
1813                 /* /etc/udev -- system-specific/user/admin rules */
1814                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1815
1816                 /* /run/udev -- throw-away/temporary rules */
1817                 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1818                 add_matching_files(udev, &file_list, filename, ".rules");
1819         } else {
1820                 /* custom rules files location for testing */
1821                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1822         }
1823
1824         /* add all filenames to the string buffer */
1825         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1826                 const char *filename = udev_list_entry_get_value(file_loop);
1827                 unsigned int filename_off;
1828
1829                 filename_off = add_string(rules, filename);
1830                 /* the offset in the rule is limited to unsigned short */
1831                 if (filename_off < USHRT_MAX)
1832                         udev_list_entry_set_num(file_loop, filename_off);
1833         }
1834
1835         /* parse all rules files */
1836         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1837                 const char *filename = udev_list_entry_get_value(file_loop);
1838                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1839                 struct stat st;
1840
1841                 if (stat(filename, &st) != 0) {
1842                         err(udev, "can not find '%s': %m\n", filename);
1843                         continue;
1844                 }
1845                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1846                         info(udev, "ignore empty '%s'\n", filename);
1847                         continue;
1848                 }
1849                 if (S_ISCHR(st.st_mode)) {
1850                         info(udev, "ignore masked '%s'\n", filename);
1851                         continue;
1852                 }
1853                 parse_file(rules, filename, filename_off);
1854         }
1855         udev_list_cleanup_entries(udev, &file_list);
1856
1857         memset(&end_token, 0x00, sizeof(struct token));
1858         end_token.type = TK_END;
1859         add_token(rules, &end_token);
1860
1861         /* shrink allocated token and string buffer */
1862         if (rules->token_cur < rules->token_max) {
1863                 struct token *tokens;
1864
1865                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1866                 if (tokens != NULL || rules->token_cur == 0) {
1867                         rules->tokens = tokens;
1868                         rules->token_max = rules->token_cur;
1869                 }
1870         }
1871         if (rules->buf_cur < rules->buf_max) {
1872                 char *buf;
1873
1874                 buf = realloc(rules->buf, rules->buf_cur);
1875                 if (buf != NULL || rules->buf_cur == 0) {
1876                         rules->buf = buf;
1877                         rules->buf_max = rules->buf_cur;
1878                 }
1879         }
1880         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1881              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1882         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1883              rules->trie_nodes_cur * sizeof(struct trie_node),
1884              rules->trie_nodes_cur, sizeof(struct trie_node));
1885
1886         /* cleanup trie */
1887         free(rules->trie_nodes);
1888         rules->trie_nodes = NULL;
1889         rules->trie_nodes_cur = 0;
1890         rules->trie_nodes_max = 0;
1891
1892         /* cleanup uid/gid cache */
1893         free(rules->uids);
1894         rules->uids = NULL;
1895         rules->uids_cur = 0;
1896         rules->uids_max = 0;
1897         free(rules->gids);
1898         rules->gids = NULL;
1899         rules->gids_cur = 0;
1900         rules->gids_max = 0;
1901
1902         dump_rules(rules);
1903         return rules;
1904 }
1905
1906 void udev_rules_unref(struct udev_rules *rules)
1907 {
1908         if (rules == NULL)
1909                 return;
1910         free(rules->tokens);
1911         free(rules->buf);
1912         free(rules->trie_nodes);
1913         free(rules->uids);
1914         free(rules->gids);
1915         free(rules);
1916 }
1917
1918 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1919 {
1920         char *key_value = &rules->buf[token->key.value_off];
1921         char *pos;
1922         bool match = false;
1923
1924         if (val == NULL)
1925                 val = "";
1926
1927         switch (token->key.glob) {
1928         case GL_PLAIN:
1929                 match = (strcmp(key_value, val) == 0);
1930                 break;
1931         case GL_GLOB:
1932                 match = (fnmatch(key_value, val, 0) == 0);
1933                 break;
1934         case GL_SPLIT:
1935                 {
1936                         const char *split;
1937                         size_t len;
1938
1939                         split = &rules->buf[token->key.value_off];
1940                         len = strlen(val);
1941                         for (;;) {
1942                                 const char *next;
1943
1944                                 next = strchr(split, '|');
1945                                 if (next != NULL) {
1946                                         size_t matchlen = (size_t)(next - split);
1947
1948                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1949                                         if (match)
1950                                                 break;
1951                                 } else {
1952                                         match = (strcmp(split, val) == 0);
1953                                         break;
1954                                 }
1955                                 split = &next[1];
1956                         }
1957                         break;
1958                 }
1959         case GL_SPLIT_GLOB:
1960                 {
1961                         char value[UTIL_PATH_SIZE];
1962
1963                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1964                         key_value = value;
1965                         while (key_value != NULL) {
1966                                 pos = strchr(key_value, '|');
1967                                 if (pos != NULL) {
1968                                         pos[0] = '\0';
1969                                         pos = &pos[1];
1970                                 }
1971                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1972                                 match = (fnmatch(key_value, val, 0) == 0);
1973                                 if (match)
1974                                         break;
1975                                 key_value = pos;
1976                         }
1977                         break;
1978                 }
1979         case GL_SOMETHING:
1980                 match = (val[0] != '\0');
1981                 break;
1982         case GL_UNSET:
1983                 return -1;
1984         }
1985
1986         if (match && (token->key.op == OP_MATCH)) {
1987                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1988                 return 0;
1989         }
1990         if (!match && (token->key.op == OP_NOMATCH)) {
1991                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1992                 return 0;
1993         }
1994         dbg(rules->udev, "%s is not true\n", token_str(token->type));
1995         return -1;
1996 }
1997
1998 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1999 {
2000         const char *name;
2001         char nbuf[UTIL_NAME_SIZE];
2002         const char *value;
2003         char vbuf[UTIL_NAME_SIZE];
2004         size_t len;
2005
2006         name = &rules->buf[cur->key.attr_off];
2007         switch (cur->key.attrsubst) {
2008         case SB_FORMAT:
2009                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2010                 name = nbuf;
2011                 /* fall through */
2012         case SB_NONE:
2013                 value = udev_device_get_sysattr_value(dev, name);
2014                 if (value == NULL)
2015                         return -1;
2016                 break;
2017         case SB_SUBSYS:
2018                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2019                         return -1;
2020                 value = vbuf;
2021                 break;
2022         default:
2023                 return -1;
2024         }
2025
2026         /* remove trailing whitespace, if not asked to match for it */
2027         len = strlen(value);
2028         if (len > 0 && isspace(value[len-1])) {
2029                 const char *key_value;
2030                 size_t klen;
2031
2032                 key_value = &rules->buf[cur->key.value_off];
2033                 klen = strlen(key_value);
2034                 if (klen > 0 && !isspace(key_value[klen-1])) {
2035                         if (value != vbuf) {
2036                                 util_strscpy(vbuf, sizeof(vbuf), value);
2037                                 value = vbuf;
2038                         }
2039                         while (len > 0 && isspace(vbuf[--len]))
2040                                 vbuf[len] = '\0';
2041                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2042                 }
2043         }
2044
2045         return match_key(rules, cur, value);
2046 }
2047
2048 enum escape_type {
2049         ESCAPE_UNSET,
2050         ESCAPE_NONE,
2051         ESCAPE_REPLACE,
2052 };
2053
2054 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2055 {
2056         struct token *cur;
2057         struct token *rule;
2058         enum escape_type esc = ESCAPE_UNSET;
2059         bool can_set_name;
2060
2061         if (rules->tokens == NULL)
2062                 return -1;
2063
2064         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2065                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2066                          udev_device_get_ifindex(event->dev) > 0));
2067
2068         /* loop through token list, match, run actions or forward to next rule */
2069         cur = &rules->tokens[0];
2070         rule = cur;
2071         for (;;) {
2072                 dump_token(rules, cur);
2073                 switch (cur->type) {
2074                 case TK_RULE:
2075                         /* current rule */
2076                         rule = cur;
2077                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2078                         if (!can_set_name && rule->rule.can_set_name)
2079                                 goto nomatch;
2080                         esc = ESCAPE_UNSET;
2081                         break;
2082                 case TK_M_ACTION:
2083                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2084                                 goto nomatch;
2085                         break;
2086                 case TK_M_DEVPATH:
2087                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2088                                 goto nomatch;
2089                         break;
2090                 case TK_M_KERNEL:
2091                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2092                                 goto nomatch;
2093                         break;
2094                 case TK_M_DEVLINK:
2095                         {
2096                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2097                                 struct udev_list_entry *list_entry;
2098                                 bool match = false;
2099
2100                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2101                                         const char *devlink;
2102
2103                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2104                                         if (match_key(rules, cur, devlink) == 0) {
2105                                                 match = true;
2106                                                 break;
2107                                         }
2108                                 }
2109                                 if (!match)
2110                                         goto nomatch;
2111                                 break;
2112                         }
2113                 case TK_M_NAME:
2114                         if (match_key(rules, cur, event->name) != 0)
2115                                 goto nomatch;
2116                         break;
2117                 case TK_M_ENV:
2118                         {
2119                                 const char *key_name = &rules->buf[cur->key.attr_off];
2120                                 const char *value;
2121
2122                                 value = udev_device_get_property_value(event->dev, key_name);
2123                                 if (value == NULL) {
2124                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2125                                         value = "";
2126                                 }
2127                                 if (match_key(rules, cur, value))
2128                                         goto nomatch;
2129                                 break;
2130                         }
2131                 case TK_M_TAG:
2132                         {
2133                                 struct udev_list_entry *list_entry;
2134                                 bool match = false;
2135
2136                                 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2137                                         if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2138                                                 match = true;
2139                                                 break;
2140                                         }
2141                                 }
2142                                 if (!match && (cur->key.op != OP_NOMATCH))
2143                                         goto nomatch;
2144                                 break;
2145                         }
2146                 case TK_M_SUBSYSTEM:
2147                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2148                                 goto nomatch;
2149                         break;
2150                 case TK_M_DRIVER:
2151                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2152                                 goto nomatch;
2153                         break;
2154                 case TK_M_WAITFOR:
2155                         {
2156                                 char filename[UTIL_PATH_SIZE];
2157                                 int found;
2158
2159                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2160                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2161                                 if (!found && (cur->key.op != OP_NOMATCH))
2162                                         goto nomatch;
2163                                 break;
2164                         }
2165                 case TK_M_ATTR:
2166                         if (match_attr(rules, event->dev, event, cur) != 0)
2167                                 goto nomatch;
2168                         break;
2169                 case TK_M_KERNELS:
2170                 case TK_M_SUBSYSTEMS:
2171                 case TK_M_DRIVERS:
2172                 case TK_M_ATTRS:
2173                         {
2174                                 struct token *next;
2175
2176                                 /* get whole sequence of parent matches */
2177                                 next = cur;
2178                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2179                                         next++;
2180
2181                                 /* loop over parents */
2182                                 event->dev_parent = event->dev;
2183                                 for (;;) {
2184                                         struct token *key;
2185
2186                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2187                                         /* loop over sequence of parent match keys */
2188                                         for (key = cur; key < next; key++ ) {
2189                                                 dump_token(rules, key);
2190                                                 switch(key->type) {
2191                                                 case TK_M_KERNELS:
2192                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2193                                                                 goto try_parent;
2194                                                         break;
2195                                                 case TK_M_SUBSYSTEMS:
2196                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2197                                                                 goto try_parent;
2198                                                         break;
2199                                                 case TK_M_DRIVERS:
2200                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2201                                                                 goto try_parent;
2202                                                         break;
2203                                                 case TK_M_ATTRS:
2204                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2205                                                                 goto try_parent;
2206                                                         break;
2207                                                 default:
2208                                                         goto nomatch;
2209                                                 }
2210                                                 dbg(event->udev, "parent key matched\n");
2211                                         }
2212                                         dbg(event->udev, "all parent keys matched\n");
2213                                         /* all keys matched */
2214                                         break;
2215
2216                                 try_parent:
2217                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2218                                         if (event->dev_parent == NULL)
2219                                                 goto nomatch;
2220                                 }
2221                                 /* move behind our sequence of parent match keys */
2222                                 cur = next;
2223                                 continue;
2224                         }
2225                 case TK_M_TEST:
2226                         {
2227                                 char filename[UTIL_PATH_SIZE];
2228                                 struct stat statbuf;
2229                                 int match;
2230
2231                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2232                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2233                                         if (filename[0] != '/') {
2234                                                 char tmp[UTIL_PATH_SIZE];
2235
2236                                                 util_strscpy(tmp, sizeof(tmp), filename);
2237                                                 util_strscpyl(filename, sizeof(filename),
2238                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2239                                         }
2240                                 }
2241                                 attr_subst_subdir(filename, sizeof(filename));
2242
2243                                 match = (stat(filename, &statbuf) == 0);
2244                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2245                                 if (match && cur->key.mode > 0) {
2246                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2247                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2248                                             match ? "matches" : "does not match", cur->key.mode);
2249                                 }
2250                                 if (match && cur->key.op == OP_NOMATCH)
2251                                         goto nomatch;
2252                                 if (!match && cur->key.op == OP_MATCH)
2253                                         goto nomatch;
2254                                 break;
2255                         }
2256                 case TK_M_EVENT_TIMEOUT:
2257                         info(event->udev, "OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2258                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2259                         break;
2260                 case TK_M_PROGRAM:
2261                         {
2262                                 char program[UTIL_PATH_SIZE];
2263                                 char **envp;
2264                                 char result[UTIL_PATH_SIZE];
2265
2266                                 free(event->program_result);
2267                                 event->program_result = NULL;
2268                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2269                                 envp = udev_device_get_properties_envp(event->dev);
2270                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2271                                      program,
2272                                      &rules->buf[rule->rule.filename_off],
2273                                      rule->rule.filename_line);
2274
2275                                 if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2276                                         if (cur->key.op != OP_NOMATCH)
2277                                                 goto nomatch;
2278                                 } else {
2279                                         int count;
2280
2281                                         util_remove_trailing_chars(result, '\n');
2282                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2283                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2284                                                 if (count > 0)
2285                                                         info(event->udev, "%i character(s) replaced\n" , count);
2286                                         }
2287                                         event->program_result = strdup(result);
2288                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2289                                         if (cur->key.op == OP_NOMATCH)
2290                                                 goto nomatch;
2291                                 }
2292                                 break;
2293                         }
2294                 case TK_M_IMPORT_FILE:
2295                         {
2296                                 char import[UTIL_PATH_SIZE];
2297
2298                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2299                                 if (import_file_into_properties(event->dev, import) != 0)
2300                                         if (cur->key.op != OP_NOMATCH)
2301                                                 goto nomatch;
2302                                 break;
2303                         }
2304                 case TK_M_IMPORT_PROG:
2305                         {
2306                                 char import[UTIL_PATH_SIZE];
2307
2308                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2309                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2310                                      import,
2311                                      &rules->buf[rule->rule.filename_off],
2312                                      rule->rule.filename_line);
2313
2314                                 if (import_program_into_properties(event, import, sigmask) != 0)
2315                                         if (cur->key.op != OP_NOMATCH)
2316                                                 goto nomatch;
2317                                 break;
2318                         }
2319                 case TK_M_IMPORT_DB:
2320                         {
2321                                 const char *key = &rules->buf[cur->key.value_off];
2322                                 const char *value;
2323
2324                                 value = udev_device_get_property_value(event->dev_db, key);
2325                                 if (value != NULL) {
2326                                         struct udev_list_entry *entry;
2327
2328                                         entry = udev_device_add_property(event->dev, key, value);
2329                                         udev_list_entry_set_num(entry, true);
2330                                 } else {
2331                                         if (cur->key.op != OP_NOMATCH)
2332                                                 goto nomatch;
2333                                 }
2334                                 break;
2335                         }
2336                 case TK_M_IMPORT_CMDLINE:
2337                         {
2338                                 FILE *f;
2339                                 bool imported = false;
2340
2341                                 f = fopen("/proc/cmdline", "r");
2342                                 if (f != NULL) {
2343                                         char cmdline[4096];
2344
2345                                         if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2346                                                 const char *key = &rules->buf[cur->key.value_off];
2347                                                 char *pos;
2348
2349                                                 pos = strstr(cmdline, key);
2350                                                 if (pos != NULL) {
2351                                                         struct udev_list_entry *entry;
2352
2353                                                         pos += strlen(key);
2354                                                         if (pos[0] == '\0' || isspace(pos[0])) {
2355                                                                 /* we import simple flags as 'FLAG=1' */
2356                                                                 entry = udev_device_add_property(event->dev, key, "1");
2357                                                                 udev_list_entry_set_num(entry, true);
2358                                                                 imported = true;
2359                                                         } else if (pos[0] == '=') {
2360                                                                 const char *value;
2361
2362                                                                 pos++;
2363                                                                 value = pos;
2364                                                                 while (pos[0] != '\0' && !isspace(pos[0]))
2365                                                                         pos++;
2366                                                                 pos[0] = '\0';
2367                                                                 entry = udev_device_add_property(event->dev, key, value);
2368                                                                 udev_list_entry_set_num(entry, true);
2369                                                                 imported = true;
2370                                                         }
2371                                                 }
2372                                         }
2373                                         fclose(f);
2374                                 }
2375                                 if (!imported && cur->key.op != OP_NOMATCH)
2376                                         goto nomatch;
2377                                 break;
2378                         }
2379                 case TK_M_IMPORT_PARENT:
2380                         {
2381                                 char import[UTIL_PATH_SIZE];
2382
2383                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2384                                 if (import_parent_into_properties(event->dev, import) != 0)
2385                                         if (cur->key.op != OP_NOMATCH)
2386                                                 goto nomatch;
2387                                 break;
2388                         }
2389                 case TK_M_RESULT:
2390                         if (match_key(rules, cur, event->program_result) != 0)
2391                                 goto nomatch;
2392                         break;
2393                 case TK_A_STRING_ESCAPE_NONE:
2394                         esc = ESCAPE_NONE;
2395                         break;
2396                 case TK_A_STRING_ESCAPE_REPLACE:
2397                         esc = ESCAPE_REPLACE;
2398                         break;
2399                 case TK_A_DB_PERSIST:
2400                         udev_device_set_db_persist(event->dev);
2401                         break;
2402                 case TK_A_INOTIFY_WATCH:
2403                         if (event->inotify_watch_final)
2404                                 break;
2405                         if (cur->key.op == OP_ASSIGN_FINAL)
2406                                 event->inotify_watch_final = true;
2407                         event->inotify_watch = cur->key.watch;
2408                         break;
2409                 case TK_A_DEVLINK_PRIO:
2410                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2411                         break;
2412                 case TK_A_OWNER:
2413                         {
2414                                 char owner[UTIL_NAME_SIZE];
2415
2416                                 if (event->owner_final)
2417                                         break;
2418                                 if (cur->key.op == OP_ASSIGN_FINAL)
2419                                         event->owner_final = true;
2420                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2421                                 event->uid = util_lookup_user(event->udev, owner);
2422                                 info(event->udev, "OWNER %u %s:%u\n",
2423                                      event->uid,
2424                                      &rules->buf[rule->rule.filename_off],
2425                                      rule->rule.filename_line);
2426                                 break;
2427                         }
2428                 case TK_A_GROUP:
2429                         {
2430                                 char group[UTIL_NAME_SIZE];
2431
2432                                 if (event->group_final)
2433                                         break;
2434                                 if (cur->key.op == OP_ASSIGN_FINAL)
2435                                         event->group_final = true;
2436                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2437                                 event->gid = util_lookup_group(event->udev, group);
2438                                 info(event->udev, "GROUP %u %s:%u\n",
2439                                      event->gid,
2440                                      &rules->buf[rule->rule.filename_off],
2441                                      rule->rule.filename_line);
2442                                 break;
2443                         }
2444                 case TK_A_MODE:
2445                         {
2446                                 char mode_str[UTIL_NAME_SIZE];
2447                                 mode_t mode;
2448                                 char *endptr;
2449
2450                                 if (event->mode_final)
2451                                         break;
2452                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2453                                 mode = strtol(mode_str, &endptr, 8);
2454                                 if (endptr[0] != '\0') {
2455                                         err(event->udev, "ignoring invalid mode '%s'\n", mode_str);
2456                                         break;
2457                                 }
2458                                 if (cur->key.op == OP_ASSIGN_FINAL)
2459                                         event->mode_final = true;
2460                                 event->mode_set = true;
2461                                 event->mode = mode;
2462                                 info(event->udev, "MODE %#o %s:%u\n",
2463                                      event->mode,
2464                                      &rules->buf[rule->rule.filename_off],
2465                                      rule->rule.filename_line);
2466                                 break;
2467                         }
2468                 case TK_A_OWNER_ID:
2469                         if (event->owner_final)
2470                                 break;
2471                         if (cur->key.op == OP_ASSIGN_FINAL)
2472                                 event->owner_final = true;
2473                         event->uid = cur->key.uid;
2474                         info(event->udev, "OWNER %u %s:%u\n",
2475                              event->uid,
2476                              &rules->buf[rule->rule.filename_off],
2477                              rule->rule.filename_line);
2478                         break;
2479                 case TK_A_GROUP_ID:
2480                         if (event->group_final)
2481                                 break;
2482                         if (cur->key.op == OP_ASSIGN_FINAL)
2483                                 event->group_final = true;
2484                         event->gid = cur->key.gid;
2485                         info(event->udev, "GROUP %u %s:%u\n",
2486                              event->gid,
2487                              &rules->buf[rule->rule.filename_off],
2488                              rule->rule.filename_line);
2489                         break;
2490                 case TK_A_MODE_ID:
2491                         if (event->mode_final)
2492                                 break;
2493                         if (cur->key.op == OP_ASSIGN_FINAL)
2494                                 event->mode_final = true;
2495                         event->mode_set = true;
2496                         event->mode = cur->key.mode;
2497                         info(event->udev, "MODE %#o %s:%u\n",
2498                              event->mode,
2499                              &rules->buf[rule->rule.filename_off],
2500                              rule->rule.filename_line);
2501                         break;
2502                 case TK_A_STATIC_NODE:
2503                         break;
2504                 case TK_A_ENV:
2505                         {
2506                                 const char *name = &rules->buf[cur->key.attr_off];
2507                                 char *value = &rules->buf[cur->key.value_off];
2508
2509                                 if (value[0] != '\0') {
2510                                         char temp_value[UTIL_NAME_SIZE];
2511                                         struct udev_list_entry *entry;
2512
2513                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2514                                         entry = udev_device_add_property(event->dev, name, temp_value);
2515                                         /* store in db, skip private keys */
2516                                         if (name[0] != '.')
2517                                                 udev_list_entry_set_num(entry, true);
2518                                 } else {
2519                                         udev_device_add_property(event->dev, name, NULL);
2520                                 }
2521                                 break;
2522                         }
2523                 case TK_A_TAG:
2524                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2525                                 udev_device_cleanup_tags_list(event->dev);
2526                         udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
2527                         break;
2528                 case TK_A_NAME:
2529                         {
2530                                 const char *name  = &rules->buf[cur->key.value_off];
2531                                 char name_str[UTIL_PATH_SIZE];
2532                                 int count;
2533
2534                                 if (event->name_final)
2535                                         break;
2536                                 if (cur->key.op == OP_ASSIGN_FINAL)
2537                                         event->name_final = true;
2538                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2539                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2540                                         count = udev_util_replace_chars(name_str, "/");
2541                                         if (count > 0)
2542                                                 info(event->udev, "%i character(s) replaced\n", count);
2543                                 }
2544                                 free(event->name);
2545                                 event->name = strdup(name_str);
2546                                 info(event->udev, "NAME '%s' %s:%u\n",
2547                                      event->name,
2548                                      &rules->buf[rule->rule.filename_off],
2549                                      rule->rule.filename_line);
2550                                 break;
2551                         }
2552                 case TK_A_DEVLINK:
2553                         {
2554                                 char temp[UTIL_PATH_SIZE];
2555                                 char filename[UTIL_PATH_SIZE];
2556                                 char *pos, *next;
2557                                 int count = 0;
2558
2559                                 if (event->devlink_final)
2560                                         break;
2561                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2562                                         break;
2563                                 if (cur->key.op == OP_ASSIGN_FINAL)
2564                                         event->devlink_final = true;
2565                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2566                                         udev_device_cleanup_devlinks_list(event->dev);
2567
2568                                 /* allow  multiple symlinks separated by spaces */
2569                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2570                                 if (esc == ESCAPE_UNSET)
2571                                         count = udev_util_replace_chars(temp, "/ ");
2572                                 else if (esc == ESCAPE_REPLACE)
2573                                         count = udev_util_replace_chars(temp, "/");
2574                                 if (count > 0)
2575                                         info(event->udev, "%i character(s) replaced\n" , count);
2576                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2577                                 pos = temp;
2578                                 while (isspace(pos[0]))
2579                                         pos++;
2580                                 next = strchr(pos, ' ');
2581                                 while (next != NULL) {
2582                                         next[0] = '\0';
2583                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2584                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2585                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2586                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2587                                         while (isspace(next[1]))
2588                                                 next++;
2589                                         pos = &next[1];
2590                                         next = strchr(pos, ' ');
2591                                 }
2592                                 if (pos[0] != '\0') {
2593                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2594                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2595                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2596                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2597                                 }
2598                         }
2599                         break;
2600                 case TK_A_ATTR:
2601                         {
2602                                 const char *key_name = &rules->buf[cur->key.attr_off];
2603                                 char attr[UTIL_PATH_SIZE];
2604                                 char value[UTIL_NAME_SIZE];
2605                                 FILE *f;
2606
2607                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2608                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2609                                 attr_subst_subdir(attr, sizeof(attr));
2610
2611                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2612                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2613                                      &rules->buf[rule->rule.filename_off],
2614                                      rule->rule.filename_line);
2615                                 f = fopen(attr, "w");
2616                                 if (f != NULL) {
2617                                         if (fprintf(f, "%s", value) <= 0)
2618                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2619                                         fclose(f);
2620                                 } else {
2621                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2622                                 }
2623                                 break;
2624                         }
2625                 case TK_A_RUN:
2626                         {
2627                                 struct udev_list_entry *list_entry;
2628
2629                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2630                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2631                                 info(event->udev, "RUN '%s' %s:%u\n",
2632                                      &rules->buf[cur->key.value_off],
2633                                      &rules->buf[rule->rule.filename_off],
2634                                      rule->rule.filename_line);
2635                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2636                                                                  &rules->buf[cur->key.value_off], NULL, UDEV_LIST_UNIQUE);
2637                                 if (cur->key.fail_on_error)
2638                                         udev_list_entry_set_num(list_entry, true);
2639                                 break;
2640                         }
2641                 case TK_A_GOTO:
2642                         if (cur->key.rule_goto == 0)
2643                                 break;
2644                         cur = &rules->tokens[cur->key.rule_goto];
2645                         continue;
2646                 case TK_END:
2647                         return 0;
2648
2649                 case TK_M_PARENTS_MIN:
2650                 case TK_M_PARENTS_MAX:
2651                 case TK_M_MAX:
2652                 case TK_UNSET:
2653                         err(rules->udev, "wrong type %u\n", cur->type);
2654                         goto nomatch;
2655                 }
2656
2657                 cur++;
2658                 continue;
2659         nomatch:
2660                 /* fast-forward to next rule */
2661                 cur = rule + rule->rule.token_count;
2662                 dbg(rules->udev, "forward to rule: %u\n",
2663                                  (unsigned int) (cur - rules->tokens));
2664         }
2665 }
2666
2667 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2668 {
2669         struct token *cur;
2670         struct token *rule;
2671         uid_t uid = 0;
2672         gid_t gid = 0;
2673         mode_t mode = 0;
2674
2675         if (rules->tokens == NULL)
2676                 return;
2677
2678         cur = &rules->tokens[0];
2679         rule = cur;
2680         for (;;) {
2681                 switch (cur->type) {
2682                 case TK_RULE:
2683                         /* current rule */
2684                         rule = cur;
2685
2686                         /* skip rules without a static_node tag */
2687                         if (!rule->rule.has_static_node)
2688                                 goto next;
2689
2690                         uid = 0;
2691                         gid = 0;
2692                         mode = 0;
2693                         break;
2694                 case TK_A_OWNER_ID:
2695                         uid = cur->key.uid;
2696                         break;
2697                 case TK_A_GROUP_ID:
2698                         gid = cur->key.gid;
2699                         break;
2700                 case TK_A_MODE_ID:
2701                         mode = cur->key.mode;
2702                         break;
2703                 case TK_A_STATIC_NODE: {
2704                         char filename[UTIL_PATH_SIZE];
2705                         struct stat stats;
2706                         /* we assure, that the permissions tokens are sorted before the static token */
2707                         if (mode == 0 && uid == 0 && gid == 0)
2708                                 goto next;
2709                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2710                                       &rules->buf[cur->key.value_off], NULL);
2711                         if (stat(filename, &stats) != 0)
2712                                 goto next;
2713                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2714                                 goto next;
2715                         if (mode != 0 && mode != (stats.st_mode & 0777)) {
2716                                 chmod(filename, mode);
2717                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2718                         }
2719                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2720                                 chown(filename, uid, gid);
2721                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2722                         }
2723                         utimensat(AT_FDCWD, filename, NULL, 0);
2724                         break;
2725                 }
2726                 case TK_END:
2727                         return;
2728                 }
2729
2730                 cur++;
2731                 continue;
2732 next:
2733                 /* fast-forward to next rule */
2734                 cur = rule + rule->rule.token_count;
2735                 continue;
2736         }
2737 }