src/udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN          2048
  36 #define PREALLOC_STRBUF         32 * 1024
  37 #define PREALLOC_TRIE           256
  38
  39 struct uid_gid {
  40         unsigned int name_off;
  41         union {
  42                 uid_t uid;
  43                 gid_t gid;
  44         };
  45 };
  46
  47 struct trie_node {
  48         /* this node's first child */
  49         unsigned int child_idx;
  50         /* the next child of our parent node's child list */
  51         unsigned int next_child_idx;
  52         /* this node's last child (shortcut for append) */
  53         unsigned int last_child_idx;
  54         unsigned int value_off;
  55         unsigned short value_len;
  56         unsigned char key;
  57 };
  58
  59 struct udev_rules {
  60         struct udev *udev;
  61         int resolve_names;
  62
  63         /* every key in the rules file becomes a token */
  64         struct token *tokens;
  65         unsigned int token_cur;
  66         unsigned int token_max;
  67
  68         /* all key strings are copied to a single string buffer */
  69         char *buf;
  70         size_t buf_cur;
  71         size_t buf_max;
  72         unsigned int buf_count;
  73
  74         /* during rule parsing, strings are indexed to find duplicates */
  75         struct trie_node *trie_nodes;
  76         unsigned int trie_nodes_cur;
  77         unsigned int trie_nodes_max;
  78
  79         /* during rule parsing, uid/gid lookup results are cached */
  80         struct uid_gid *uids;
  81         unsigned int uids_cur;
  82         unsigned int uids_max;
  83         struct uid_gid *gids;
  84         unsigned int gids_cur;
  85         unsigned int gids_max;
  86 };
  87
  88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  89 enum operation_type {
  90         OP_UNSET,
  91
  92         OP_MATCH,
  93         OP_NOMATCH,
  94         OP_MATCH_MAX,
  95
  96         OP_ADD,
  97         OP_ASSIGN,
  98         OP_ASSIGN_FINAL,
  99 };
 100
 101 enum string_glob_type {
 102         GL_UNSET,
 103         GL_PLAIN,                       /* no special chars */
 104         GL_GLOB,                        /* shell globs ?,*,[] */
 105         GL_SPLIT,                       /* multi-value A|B */
 106         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 107         GL_SOMETHING,                   /* commonly used "?*" */
 108 };
 109
 110 enum string_subst_type {
 111         SB_UNSET,
 112         SB_NONE,
 113         SB_FORMAT,
 114         SB_SUBSYS,
 115 };
 116
 117 /* tokens of a rule are sorted/handled in this order */
 118 enum token_type {
 119         TK_UNSET,
 120         TK_RULE,
 121
 122         TK_M_ACTION,                    /* val */
 123         TK_M_DEVPATH,                   /* val */
 124         TK_M_KERNEL,                    /* val */
 125         TK_M_DEVLINK,                   /* val */
 126         TK_M_NAME,                      /* val */
 127         TK_M_ENV,                       /* val, attr */
 128         TK_M_TAG,                       /* val */
 129         TK_M_SUBSYSTEM,                 /* val */
 130         TK_M_DRIVER,                    /* val */
 131         TK_M_WAITFOR,                   /* val */
 132         TK_M_ATTR,                      /* val, attr */
 133
 134         TK_M_PARENTS_MIN,
 135         TK_M_KERNELS,                   /* val */
 136         TK_M_SUBSYSTEMS,                /* val */
 137         TK_M_DRIVERS,                   /* val */
 138         TK_M_ATTRS,                     /* val, attr */
 139         TK_M_TAGS,                      /* val */
 140         TK_M_PARENTS_MAX,
 141
 142         TK_M_TEST,                      /* val, mode_t */
 143         TK_M_EVENT_TIMEOUT,             /* int */
 144         TK_M_PROGRAM,                   /* val */
 145         TK_M_IMPORT_FILE,               /* val */
 146         TK_M_IMPORT_PROG,               /* val */
 147         TK_M_IMPORT_BUILTIN,            /* val */
 148         TK_M_IMPORT_DB,                 /* val */
 149         TK_M_IMPORT_CMDLINE,            /* val */
 150         TK_M_IMPORT_PARENT,             /* val */
 151         TK_M_RESULT,                    /* val */
 152         TK_M_MAX,
 153
 154         TK_A_STRING_ESCAPE_NONE,
 155         TK_A_STRING_ESCAPE_REPLACE,
 156         TK_A_DB_PERSIST,
 157         TK_A_INOTIFY_WATCH,             /* int */
 158         TK_A_DEVLINK_PRIO,              /* int */
 159         TK_A_OWNER,                     /* val */
 160         TK_A_GROUP,                     /* val */
 161         TK_A_MODE,                      /* val */
 162         TK_A_OWNER_ID,                  /* uid_t */
 163         TK_A_GROUP_ID,                  /* gid_t */
 164         TK_A_MODE_ID,                   /* mode_t */
 165         TK_A_STATIC_NODE,               /* val */
 166         TK_A_ENV,                       /* val, attr */
 167         TK_A_TAG,                       /* val */
 168         TK_A_NAME,                      /* val */
 169         TK_A_DEVLINK,                   /* val */
 170         TK_A_ATTR,                      /* val, attr */
 171         TK_A_RUN_BUILTIN,               /* val, bool */
 172         TK_A_RUN_PROGRAM,               /* val, bool */
 173         TK_A_GOTO,                      /* size_t */
 174
 175         TK_END,
 176 };
 177
 178 /* we try to pack stuff in a way that we take only 12 bytes per token */
 179 struct token {
 180         union {
 181                 unsigned char type;                /* same in rule and key */
 182                 struct {
 183                         enum token_type type:8;
 184                         bool can_set_name:1;
 185                         bool has_static_node:1;
 186                         unsigned int unused:6;
 187                         unsigned short token_count;
 188                         unsigned int label_off;
 189                         unsigned short filename_off;
 190                         unsigned short filename_line;
 191                 } rule;
 192                 struct {
 193                         enum token_type type:8;
 194                         enum operation_type op:8;
 195                         enum string_glob_type glob:8;
 196                         enum string_subst_type subst:4;
 197                         enum string_subst_type attrsubst:4;
 198                         unsigned int value_off;
 199                         union {
 200                                 unsigned int attr_off;
 201                                 int devlink_unique;
 202                                 unsigned int rule_goto;
 203                                 mode_t  mode;
 204                                 uid_t uid;
 205                                 gid_t gid;
 206                                 int devlink_prio;
 207                                 int event_timeout;
 208                                 int watch;
 209                                 enum udev_builtin_cmd builtin_cmd;
 210                         };
 211                 } key;
 212         };
 213 };
 214
 215 #define MAX_TK                64
 216 struct rule_tmp {
 217         struct udev_rules *rules;
 218         struct token rule;
 219         struct token token[MAX_TK];
 220         unsigned int token_cur;
 221 };
 222
 223 #ifdef DEBUG
 224 static const char *operation_str(enum operation_type type)
 225 {
 226         static const char *operation_strs[] = {
 227                 [OP_UNSET] =            "UNSET",
 228                 [OP_MATCH] =            "match",
 229                 [OP_NOMATCH] =          "nomatch",
 230                 [OP_MATCH_MAX] =        "MATCH_MAX",
 231
 232                 [OP_ADD] =              "add",
 233                 [OP_ASSIGN] =           "assign",
 234                 [OP_ASSIGN_FINAL] =     "assign-final",
 235 }        ;
 236
 237         return operation_strs[type];
 238 }
 239
 240 static const char *string_glob_str(enum string_glob_type type)
 241 {
 242         static const char *string_glob_strs[] = {
 243                 [GL_UNSET] =            "UNSET",
 244                 [GL_PLAIN] =            "plain",
 245                 [GL_GLOB] =             "glob",
 246                 [GL_SPLIT] =            "split",
 247                 [GL_SPLIT_GLOB] =       "split-glob",
 248                 [GL_SOMETHING] =        "split-glob",
 249         };
 250
 251         return string_glob_strs[type];
 252 }
 253
 254 static const char *token_str(enum token_type type)
 255 {
 256         static const char *token_strs[] = {
 257                 [TK_UNSET] =                    "UNSET",
 258                 [TK_RULE] =                     "RULE",
 259
 260                 [TK_M_ACTION] =                 "M ACTION",
 261                 [TK_M_DEVPATH] =                "M DEVPATH",
 262                 [TK_M_KERNEL] =                 "M KERNEL",
 263                 [TK_M_DEVLINK] =                "M DEVLINK",
 264                 [TK_M_NAME] =                   "M NAME",
 265                 [TK_M_ENV] =                    "M ENV",
 266                 [TK_M_TAG] =                    "M TAG",
 267                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 268                 [TK_M_DRIVER] =                 "M DRIVER",
 269                 [TK_M_WAITFOR] =                "M WAITFOR",
 270                 [TK_M_ATTR] =                   "M ATTR",
 271
 272                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 273                 [TK_M_KERNELS] =                "M KERNELS",
 274                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 275                 [TK_M_DRIVERS] =                "M DRIVERS",
 276                 [TK_M_ATTRS] =                  "M ATTRS",
 277                 [TK_M_TAGS] =                   "M TAGS",
 278                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 279
 280                 [TK_M_TEST] =                   "M TEST",
 281                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 282                 [TK_M_PROGRAM] =                "M PROGRAM",
 283                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 284                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 285                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 286                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 287                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 288                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 289                 [TK_M_RESULT] =                 "M RESULT",
 290                 [TK_M_MAX] =                    "M MAX",
 291
 292                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 293                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 294                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 295                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 296                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 297                 [TK_A_OWNER] =                  "A OWNER",
 298                 [TK_A_GROUP] =                  "A GROUP",
 299                 [TK_A_MODE] =                   "A MODE",
 300                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 301                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 302                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 303                 [TK_A_MODE_ID] =                "A MODE_ID",
 304                 [TK_A_ENV] =                    "A ENV",
 305                 [TK_A_TAG] =                    "A ENV",
 306                 [TK_A_NAME] =                   "A NAME",
 307                 [TK_A_DEVLINK] =                "A DEVLINK",
 308                 [TK_A_ATTR] =                   "A ATTR",
 309                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 310                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 311                 [TK_A_GOTO] =                   "A GOTO",
 312
 313                 [TK_END] =                      "END",
 314         };
 315
 316         return token_strs[type];
 317 }
 318
 319 static void dump_token(struct udev_rules *rules, struct token *token)
 320 {
 321         enum token_type type = token->type;
 322         enum operation_type op = token->key.op;
 323         enum string_glob_type glob = token->key.glob;
 324         const char *value = &rules->buf[token->key.value_off];
 325         const char *attr = &rules->buf[token->key.attr_off];
 326
 327         switch (type) {
 328         case TK_RULE:
 329                 {
 330                         const char *tks_ptr = (char *)rules->tokens;
 331                         const char *tk_ptr = (char *)token;
 332                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 333
 334                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 335                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 336                                   idx, token->rule.token_count,
 337                                   &rules->buf[token->rule.label_off]);
 338                         break;
 339                 }
 340         case TK_M_ACTION:
 341         case TK_M_DEVPATH:
 342         case TK_M_KERNEL:
 343         case TK_M_SUBSYSTEM:
 344         case TK_M_DRIVER:
 345         case TK_M_WAITFOR:
 346         case TK_M_DEVLINK:
 347         case TK_M_NAME:
 348         case TK_M_KERNELS:
 349         case TK_M_SUBSYSTEMS:
 350         case TK_M_DRIVERS:
 351         case TK_M_TAGS:
 352         case TK_M_PROGRAM:
 353         case TK_M_IMPORT_FILE:
 354         case TK_M_IMPORT_PROG:
 355         case TK_M_IMPORT_DB:
 356         case TK_M_IMPORT_CMDLINE:
 357         case TK_M_IMPORT_PARENT:
 358         case TK_M_RESULT:
 359         case TK_A_NAME:
 360         case TK_A_DEVLINK:
 361         case TK_A_OWNER:
 362         case TK_A_GROUP:
 363         case TK_A_MODE:
 364         case TK_A_RUN_BUILTIN:
 365         case TK_A_RUN_PROGRAM:
 366                 log_debug("%s %s '%s'(%s)\n",
 367                           token_str(type), operation_str(op), value, string_glob_str(glob));
 368                 break;
 369         case TK_M_IMPORT_BUILTIN:
 370                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 371                 break;
 372         case TK_M_ATTR:
 373         case TK_M_ATTRS:
 374         case TK_M_ENV:
 375         case TK_A_ATTR:
 376         case TK_A_ENV:
 377                 log_debug("%s %s '%s' '%s'(%s)\n",
 378                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 379                 break;
 380         case TK_M_TAG:
 381         case TK_A_TAG:
 382                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 383                 break;
 384         case TK_A_STRING_ESCAPE_NONE:
 385         case TK_A_STRING_ESCAPE_REPLACE:
 386         case TK_A_DB_PERSIST:
 387                 log_debug("%s\n", token_str(type));
 388                 break;
 389         case TK_M_TEST:
 390                 log_debug("%s %s '%s'(%s) %#o\n",
 391                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 392                 break;
 393         case TK_A_INOTIFY_WATCH:
 394                 log_debug("%s %u\n", token_str(type), token->key.watch);
 395                 break;
 396         case TK_A_DEVLINK_PRIO:
 397                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 398                 break;
 399         case TK_A_OWNER_ID:
 400                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 401                 break;
 402         case TK_A_GROUP_ID:
 403                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 404                 break;
 405         case TK_A_MODE_ID:
 406                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 407                 break;
 408         case TK_A_STATIC_NODE:
 409                 log_debug("%s '%s'\n", token_str(type), value);
 410                 break;
 411         case TK_M_EVENT_TIMEOUT:
 412                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 413                 break;
 414         case TK_A_GOTO:
 415                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 416                 break;
 417         case TK_END:
 418                 log_debug("* %s\n", token_str(type));
 419                 break;
 420         case TK_M_PARENTS_MIN:
 421         case TK_M_PARENTS_MAX:
 422         case TK_M_MAX:
 423         case TK_UNSET:
 424                 log_debug("unknown type %u\n", type);
 425                 break;
 426         }
 427 }
 428
 429 static void dump_rules(struct udev_rules *rules)
 430 {
 431         unsigned int i;
 432
 433         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 434                   rules->token_cur,
 435                   rules->token_cur * sizeof(struct token),
 436                   rules->buf_count,
 437                   rules->buf_cur);
 438         for(i = 0; i < rules->token_cur; i++)
 439                 dump_token(rules, &rules->tokens[i]);
 440 }
 441 #else
 442 static inline const char *operation_str(enum operation_type type) { return NULL; }
 443 static inline const char *token_str(enum token_type type) { return NULL; }
 444 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 445 static inline void dump_rules(struct udev_rules *rules) {}
 446 #endif /* DEBUG */
 447
 448 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 449 {
 450         int off;
 451
 452         /* grow buffer if needed */
 453         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 454                 char *buf;
 455                 unsigned int add;
 456
 457                 /* double the buffer size */
 458                 add = rules->buf_max;
 459                 if (add < bytes * 8)
 460                         add = bytes * 8;
 461
 462                 buf = realloc(rules->buf, rules->buf_max + add);
 463                 if (buf == NULL)
 464                         return -1;
 465                 rules->buf = buf;
 466                 rules->buf_max += add;
 467         }
 468         off = rules->buf_cur;
 469         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 470         rules->buf_cur += bytes;
 471         rules->buf_count++;
 472         return off;
 473 }
 474
 475 static int add_string(struct udev_rules *rules, const char *str)
 476 {
 477         unsigned int node_idx;
 478         struct trie_node *new_node;
 479         unsigned int new_node_idx;
 480         unsigned char key;
 481         unsigned short len;
 482         unsigned int depth;
 483         unsigned int off;
 484         struct trie_node *parent;
 485
 486         /* walk trie, start from last character of str to find matching tails */
 487         len = strlen(str);
 488         key = str[len-1];
 489         node_idx = 0;
 490         for (depth = 0; depth <= len; depth++) {
 491                 struct trie_node *node;
 492                 unsigned int child_idx;
 493
 494                 node = &rules->trie_nodes[node_idx];
 495                 off = node->value_off + node->value_len - len;
 496
 497                 /* match against current node */
 498                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 499                         return off;
 500
 501                 /* lookup child node */
 502                 key = str[len - 1 - depth];
 503                 child_idx = node->child_idx;
 504                 while (child_idx > 0) {
 505                         struct trie_node *child;
 506
 507                         child = &rules->trie_nodes[child_idx];
 508                         if (child->key == key)
 509                                 break;
 510                         child_idx = child->next_child_idx;
 511                 }
 512                 if (child_idx == 0)
 513                         break;
 514                 node_idx = child_idx;
 515         }
 516
 517         /* string not found, add it */
 518         off = add_new_string(rules, str, len + 1);
 519
 520         /* grow trie nodes if needed */
 521         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 522                 struct trie_node *nodes;
 523                 unsigned int add;
 524
 525                 /* double the buffer size */
 526                 add = rules->trie_nodes_max;
 527                 if (add < 8)
 528                         add = 8;
 529
 530                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 531                 if (nodes == NULL)
 532                         return -1;
 533                 rules->trie_nodes = nodes;
 534                 rules->trie_nodes_max += add;
 535         }
 536
 537         /* get a new node */
 538         new_node_idx = rules->trie_nodes_cur;
 539         rules->trie_nodes_cur++;
 540         new_node = &rules->trie_nodes[new_node_idx];
 541         memset(new_node, 0x00, sizeof(struct trie_node));
 542         new_node->value_off = off;
 543         new_node->value_len = len;
 544         new_node->key = key;
 545
 546         /* join the parent's child list */
 547         parent = &rules->trie_nodes[node_idx];
 548         if (parent->child_idx == 0) {
 549                 parent->child_idx = new_node_idx;
 550         } else {
 551                 struct trie_node *last_child;
 552
 553                 last_child = &rules->trie_nodes[parent->last_child_idx];
 554                 last_child->next_child_idx = new_node_idx;
 555         }
 556         parent->last_child_idx = new_node_idx;
 557         return off;
 558 }
 559
 560 static int add_token(struct udev_rules *rules, struct token *token)
 561 {
 562         /* grow buffer if needed */
 563         if (rules->token_cur+1 >= rules->token_max) {
 564                 struct token *tokens;
 565                 unsigned int add;
 566
 567                 /* double the buffer size */
 568                 add = rules->token_max;
 569                 if (add < 8)
 570                         add = 8;
 571
 572                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 573                 if (tokens == NULL)
 574                         return -1;
 575                 rules->tokens = tokens;
 576                 rules->token_max += add;
 577         }
 578         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 579         rules->token_cur++;
 580         return 0;
 581 }
 582
 583 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 584 {
 585         unsigned int i;
 586         uid_t uid;
 587         unsigned int off;
 588
 589         /* lookup, if we know it already */
 590         for (i = 0; i < rules->uids_cur; i++) {
 591                 off = rules->uids[i].name_off;
 592                 if (strcmp(&rules->buf[off], owner) == 0) {
 593                         uid = rules->uids[i].uid;
 594                         return uid;
 595                 }
 596         }
 597         uid = util_lookup_user(rules->udev, owner);
 598
 599         /* grow buffer if needed */
 600         if (rules->uids_cur+1 >= rules->uids_max) {
 601                 struct uid_gid *uids;
 602                 unsigned int add;
 603
 604                 /* double the buffer size */
 605                 add = rules->uids_max;
 606                 if (add < 1)
 607                         add = 8;
 608
 609                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 610                 if (uids == NULL)
 611                         return uid;
 612                 rules->uids = uids;
 613                 rules->uids_max += add;
 614         }
 615         rules->uids[rules->uids_cur].uid = uid;
 616         off = add_string(rules, owner);
 617         if (off <= 0)
 618                 return uid;
 619         rules->uids[rules->uids_cur].name_off = off;
 620         rules->uids_cur++;
 621         return uid;
 622 }
 623
 624 static gid_t add_gid(struct udev_rules *rules, const char *group)
 625 {
 626         unsigned int i;
 627         gid_t gid;
 628         unsigned int off;
 629
 630         /* lookup, if we know it already */
 631         for (i = 0; i < rules->gids_cur; i++) {
 632                 off = rules->gids[i].name_off;
 633                 if (strcmp(&rules->buf[off], group) == 0) {
 634                         gid = rules->gids[i].gid;
 635                         return gid;
 636                 }
 637         }
 638         gid = util_lookup_group(rules->udev, group);
 639
 640         /* grow buffer if needed */
 641         if (rules->gids_cur+1 >= rules->gids_max) {
 642                 struct uid_gid *gids;
 643                 unsigned int add;
 644
 645                 /* double the buffer size */
 646                 add = rules->gids_max;
 647                 if (add < 1)
 648                         add = 8;
 649
 650                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 651                 if (gids == NULL)
 652                         return gid;
 653                 rules->gids = gids;
 654                 rules->gids_max += add;
 655         }
 656         rules->gids[rules->gids_cur].gid = gid;
 657         off = add_string(rules, group);
 658         if (off <= 0)
 659                 return gid;
 660         rules->gids[rules->gids_cur].name_off = off;
 661         rules->gids_cur++;
 662         return gid;
 663 }
 664
 665 static int import_property_from_string(struct udev_device *dev, char *line)
 666 {
 667         struct udev *udev = udev_device_get_udev(dev);
 668         char *key;
 669         char *val;
 670         size_t len;
 671
 672         /* find key */
 673         key = line;
 674         while (isspace(key[0]))
 675                 key++;
 676
 677         /* comment or empty line */
 678         if (key[0] == '#' || key[0] == '\0')
 679                 return -1;
 680
 681         /* split key/value */
 682         val = strchr(key, '=');
 683         if (val == NULL)
 684                 return -1;
 685         val[0] = '\0';
 686         val++;
 687
 688         /* find value */
 689         while (isspace(val[0]))
 690                 val++;
 691
 692         /* terminate key */
 693         len = strlen(key);
 694         if (len == 0)
 695                 return -1;
 696         while (isspace(key[len-1]))
 697                 len--;
 698         key[len] = '\0';
 699
 700         /* terminate value */
 701         len = strlen(val);
 702         if (len == 0)
 703                 return -1;
 704         while (isspace(val[len-1]))
 705                 len--;
 706         val[len] = '\0';
 707
 708         if (len == 0)
 709                 return -1;
 710
 711         /* unquote */
 712         if (val[0] == '"' || val[0] == '\'') {
 713                 if (val[len-1] != val[0]) {
 714                         log_debug("inconsistent quoting: '%s', skip\n", line);
 715                         return -1;
 716                 }
 717                 val[len-1] = '\0';
 718                 val++;
 719         }
 720
 721         /* handle device, renamed by external tool, returning new path */
 722         if (strcmp(key, "DEVPATH") == 0) {
 723                 char syspath[UTIL_PATH_SIZE];
 724
 725                 log_debug("updating devpath from '%s' to '%s'\n",
 726                           udev_device_get_devpath(dev), val);
 727                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 728                 udev_device_set_syspath(dev, syspath);
 729         } else {
 730                 struct udev_list_entry *entry;
 731
 732                 entry = udev_device_add_property(dev, key, val);
 733                 /* store in db, skip private keys */
 734                 if (key[0] != '.')
 735                         udev_list_entry_set_num(entry, true);
 736         }
 737         return 0;
 738 }
 739
 740 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 741 {
 742         FILE *f;
 743         char line[UTIL_LINE_SIZE];
 744
 745         f = fopen(filename, "r");
 746         if (f == NULL)
 747                 return -1;
 748         while (fgets(line, sizeof(line), f) != NULL)
 749                 import_property_from_string(dev, line);
 750         fclose(f);
 751         return 0;
 752 }
 753
 754 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 755 {
 756         struct udev_device *dev = event->dev;
 757         char **envp;
 758         char result[UTIL_LINE_SIZE];
 759         char *line;
 760         int err;
 761
 762         envp = udev_device_get_properties_envp(dev);
 763         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 764         if (err < 0)
 765                 return err;
 766
 767         line = result;
 768         while (line != NULL) {
 769                 char *pos;
 770
 771                 pos = strchr(line, '\n');
 772                 if (pos != NULL) {
 773                         pos[0] = '\0';
 774                         pos = &pos[1];
 775                 }
 776                 import_property_from_string(dev, line);
 777                 line = pos;
 778         }
 779         return 0;
 780 }
 781
 782 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 783 {
 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         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 792                 const char *key = udev_list_entry_get_name(list_entry);
 793                 const char *val = udev_list_entry_get_value(list_entry);
 794
 795                 if (fnmatch(filter, key, 0) == 0) {
 796                         struct udev_list_entry *entry;
 797
 798                         entry = udev_device_add_property(dev, key, val);
 799                         /* store in db, skip private keys */
 800                         if (key[0] != '.')
 801                                 udev_list_entry_set_num(entry, true);
 802                 }
 803         }
 804         return 0;
 805 }
 806
 807 #define WAIT_LOOP_PER_SECOND                50
 808 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 809 {
 810         struct udev *udev = udev_device_get_udev(dev);
 811         char filepath[UTIL_PATH_SIZE];
 812         char devicepath[UTIL_PATH_SIZE];
 813         struct stat stats;
 814         int loop = timeout * WAIT_LOOP_PER_SECOND;
 815
 816         /* a relative path is a device attribute */
 817         devicepath[0] = '\0';
 818         if (file[0] != '/') {
 819                 util_strscpyl(devicepath, sizeof(devicepath),
 820                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 821                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 822                 file = filepath;
 823         }
 824
 825         while (--loop) {
 826                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 827
 828                 /* lookup file */
 829                 if (stat(file, &stats) == 0) {
 830                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 831                         return 0;
 832                 }
 833                 /* make sure, the device did not disappear in the meantime */
 834                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 835                         log_debug("device disappeared while waiting for '%s'\n", file);
 836                         return -2;
 837                 }
 838                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 839                 nanosleep(&duration, NULL);
 840         }
 841         log_debug("waiting for '%s' failed\n", file);
 842         return -1;
 843 }
 844
 845 static int attr_subst_subdir(char *attr, size_t len)
 846 {
 847         bool found = false;
 848
 849         if (strstr(attr, "/*/")) {
 850                 char *pos;
 851                 char dirname[UTIL_PATH_SIZE];
 852                 const char *tail;
 853                 DIR *dir;
 854
 855                 util_strscpy(dirname, sizeof(dirname), attr);
 856                 pos = strstr(dirname, "/*/");
 857                 if (pos == NULL)
 858                         return -1;
 859                 pos[0] = '\0';
 860                 tail = &pos[2];
 861                 dir = opendir(dirname);
 862                 if (dir != NULL) {
 863                         struct dirent *dent;
 864
 865                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 866                                 struct stat stats;
 867
 868                                 if (dent->d_name[0] == '.')
 869                                         continue;
 870                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 871                                 if (stat(attr, &stats) == 0) {
 872                                         found = true;
 873                                         break;
 874                                 }
 875                         }
 876                         closedir(dir);
 877                 }
 878         }
 879
 880         return found;
 881 }
 882
 883 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 884 {
 885         char *linepos;
 886         char *temp;
 887
 888         linepos = *line;
 889         if (linepos == NULL || linepos[0] == '\0')
 890                 return -1;
 891
 892         /* skip whitespace */
 893         while (isspace(linepos[0]) || linepos[0] == ',')
 894                 linepos++;
 895
 896         /* get the key */
 897         if (linepos[0] == '\0')
 898                 return -1;
 899         *key = linepos;
 900
 901         for (;;) {
 902                 linepos++;
 903                 if (linepos[0] == '\0')
 904                         return -1;
 905                 if (isspace(linepos[0]))
 906                         break;
 907                 if (linepos[0] == '=')
 908                         break;
 909                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 910                         if (linepos[1] == '=')
 911                                 break;
 912         }
 913
 914         /* remember end of key */
 915         temp = linepos;
 916
 917         /* skip whitespace after key */
 918         while (isspace(linepos[0]))
 919                 linepos++;
 920         if (linepos[0] == '\0')
 921                 return -1;
 922
 923         /* get operation type */
 924         if (linepos[0] == '=' && linepos[1] == '=') {
 925                 *op = OP_MATCH;
 926                 linepos += 2;
 927         } else if (linepos[0] == '!' && linepos[1] == '=') {
 928                 *op = OP_NOMATCH;
 929                 linepos += 2;
 930         } else if (linepos[0] == '+' && linepos[1] == '=') {
 931                 *op = OP_ADD;
 932                 linepos += 2;
 933         } else if (linepos[0] == '=') {
 934                 *op = OP_ASSIGN;
 935                 linepos++;
 936         } else if (linepos[0] == ':' && linepos[1] == '=') {
 937                 *op = OP_ASSIGN_FINAL;
 938                 linepos += 2;
 939         } else
 940                 return -1;
 941
 942         /* terminate key */
 943         temp[0] = '\0';
 944
 945         /* skip whitespace after operator */
 946         while (isspace(linepos[0]))
 947                 linepos++;
 948         if (linepos[0] == '\0')
 949                 return -1;
 950
 951         /* get the value */
 952         if (linepos[0] == '"')
 953                 linepos++;
 954         else
 955                 return -1;
 956         *value = linepos;
 957
 958         /* terminate */
 959         temp = strchr(linepos, '"');
 960         if (!temp)
 961                 return -1;
 962         temp[0] = '\0';
 963         temp++;
 964
 965         /* move line to next key */
 966         *line = temp;
 967         return 0;
 968 }
 969
 970 /* extract possible KEY{attr} */
 971 static const char *get_key_attribute(struct udev *udev, char *str)
 972 {
 973         char *pos;
 974         char *attr;
 975
 976         attr = strchr(str, '{');
 977         if (attr != NULL) {
 978                 attr++;
 979                 pos = strchr(attr, '}');
 980                 if (pos == NULL) {
 981                         log_error("missing closing brace for format\n");
 982                         return NULL;
 983                 }
 984                 pos[0] = '\0';
 985                 return attr;
 986         }
 987         return NULL;
 988 }
 989
 990 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 991                         enum operation_type op,
 992                         const char *value, const void *data)
 993 {
 994         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 995         const char *attr = NULL;
 996
 997         memset(token, 0x00, sizeof(struct token));
 998
 999         switch (type) {
1000         case TK_M_ACTION:
1001         case TK_M_DEVPATH:
1002         case TK_M_KERNEL:
1003         case TK_M_SUBSYSTEM:
1004         case TK_M_DRIVER:
1005         case TK_M_WAITFOR:
1006         case TK_M_DEVLINK:
1007         case TK_M_NAME:
1008         case TK_M_KERNELS:
1009         case TK_M_SUBSYSTEMS:
1010         case TK_M_DRIVERS:
1011         case TK_M_TAGS:
1012         case TK_M_PROGRAM:
1013         case TK_M_IMPORT_FILE:
1014         case TK_M_IMPORT_PROG:
1015         case TK_M_IMPORT_DB:
1016         case TK_M_IMPORT_CMDLINE:
1017         case TK_M_IMPORT_PARENT:
1018         case TK_M_RESULT:
1019         case TK_A_OWNER:
1020         case TK_A_GROUP:
1021         case TK_A_MODE:
1022         case TK_A_NAME:
1023         case TK_A_GOTO:
1024         case TK_M_TAG:
1025         case TK_A_TAG:
1026                 token->key.value_off = add_string(rule_tmp->rules, value);
1027                 break;
1028         case TK_M_IMPORT_BUILTIN:
1029                 token->key.value_off = add_string(rule_tmp->rules, value);
1030                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
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_BUILTIN:
1055         case TK_A_RUN_PROGRAM:
1056                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1057                 token->key.value_off = add_string(rule_tmp->rules, value);
1058                 break;
1059         case TK_A_INOTIFY_WATCH:
1060         case TK_A_DEVLINK_PRIO:
1061                 token->key.devlink_prio = *(int *)data;
1062                 break;
1063         case TK_A_OWNER_ID:
1064                 token->key.uid = *(uid_t *)data;
1065                 break;
1066         case TK_A_GROUP_ID:
1067                 token->key.gid = *(gid_t *)data;
1068                 break;
1069         case TK_A_MODE_ID:
1070                 token->key.mode = *(mode_t *)data;
1071                 break;
1072         case TK_A_STATIC_NODE:
1073                 token->key.value_off = add_string(rule_tmp->rules, value);
1074                 break;
1075         case TK_M_EVENT_TIMEOUT:
1076                 token->key.event_timeout = *(int *)data;
1077                 break;
1078         case TK_RULE:
1079         case TK_M_PARENTS_MIN:
1080         case TK_M_PARENTS_MAX:
1081         case TK_M_MAX:
1082         case TK_END:
1083         case TK_UNSET:
1084                 log_error("wrong type %u\n", type);
1085                 return -1;
1086         }
1087
1088         if (value != NULL && type < TK_M_MAX) {
1089                 /* check if we need to split or call fnmatch() while matching rules */
1090                 enum string_glob_type glob;
1091                 int has_split;
1092                 int has_glob;
1093
1094                 has_split = (strchr(value, '|') != NULL);
1095                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1096                 if (has_split && has_glob) {
1097                         glob = GL_SPLIT_GLOB;
1098                 } else if (has_split) {
1099                         glob = GL_SPLIT;
1100                 } else if (has_glob) {
1101                         if (strcmp(value, "?*") == 0)
1102                                 glob = GL_SOMETHING;
1103                         else
1104                                 glob = GL_GLOB;
1105                 } else {
1106                         glob = GL_PLAIN;
1107                 }
1108                 token->key.glob = glob;
1109         }
1110
1111         if (value != NULL && type > TK_M_MAX) {
1112                 /* check if assigned value has substitution chars */
1113                 if (value[0] == '[')
1114                         token->key.subst = SB_SUBSYS;
1115                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1116                         token->key.subst = SB_FORMAT;
1117                 else
1118                         token->key.subst = SB_NONE;
1119         }
1120
1121         if (attr != NULL) {
1122                 /* check if property/attribut name has substitution chars */
1123                 if (attr[0] == '[')
1124                         token->key.attrsubst = SB_SUBSYS;
1125                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1126                         token->key.attrsubst = SB_FORMAT;
1127                 else
1128                         token->key.attrsubst = SB_NONE;
1129         }
1130
1131         token->key.type = type;
1132         token->key.op = op;
1133         rule_tmp->token_cur++;
1134         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1135                 log_error("temporary rule array too small\n");
1136                 return -1;
1137         }
1138         return 0;
1139 }
1140
1141 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1142 {
1143         unsigned int i;
1144         unsigned int start = 0;
1145         unsigned int end = rule_tmp->token_cur;
1146
1147         for (i = 0; i < rule_tmp->token_cur; i++) {
1148                 enum token_type next_val = TK_UNSET;
1149                 unsigned int next_idx = 0;
1150                 unsigned int j;
1151
1152                 /* find smallest value */
1153                 for (j = start; j < end; j++) {
1154                         if (rule_tmp->token[j].type == TK_UNSET)
1155                                 continue;
1156                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1157                                 next_val = rule_tmp->token[j].type;
1158                                 next_idx = j;
1159                         }
1160                 }
1161
1162                 /* add token and mark done */
1163                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1164                         return -1;
1165                 rule_tmp->token[next_idx].type = TK_UNSET;
1166
1167                 /* shrink range */
1168                 if (next_idx == start)
1169                         start++;
1170                 if (next_idx+1 == end)
1171                         end--;
1172         }
1173         return 0;
1174 }
1175
1176 static int add_rule(struct udev_rules *rules, char *line,
1177                     const char *filename, unsigned int filename_off, unsigned int lineno)
1178 {
1179         char *linepos;
1180         const char *attr;
1181         struct rule_tmp rule_tmp;
1182
1183         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1184         rule_tmp.rules = rules;
1185         rule_tmp.rule.type = TK_RULE;
1186         rule_tmp.rule.rule.filename_off = filename_off;
1187         rule_tmp.rule.rule.filename_line = lineno;
1188
1189         linepos = line;
1190         for (;;) {
1191                 char *key;
1192                 char *value;
1193                 enum operation_type op;
1194
1195                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1196                         break;
1197
1198                 if (strcmp(key, "ACTION") == 0) {
1199                         if (op > OP_MATCH_MAX) {
1200                                 log_error("invalid ACTION operation\n");
1201                                 goto invalid;
1202                         }
1203                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1204                         continue;
1205                 }
1206
1207                 if (strcmp(key, "DEVPATH") == 0) {
1208                         if (op > OP_MATCH_MAX) {
1209                                 log_error("invalid DEVPATH operation\n");
1210                                 goto invalid;
1211                         }
1212                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1213                         continue;
1214                 }
1215
1216                 if (strcmp(key, "KERNEL") == 0) {
1217                         if (op > OP_MATCH_MAX) {
1218                                 log_error("invalid KERNEL operation\n");
1219                                 goto invalid;
1220                         }
1221                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1222                         continue;
1223                 }
1224
1225                 if (strcmp(key, "SUBSYSTEM") == 0) {
1226                         if (op > OP_MATCH_MAX) {
1227                                 log_error("invalid SUBSYSTEM operation\n");
1228                                 goto invalid;
1229                         }
1230                         /* bus, class, subsystem events should all be the same */
1231                         if (strcmp(value, "subsystem") == 0 ||
1232                             strcmp(value, "bus") == 0 ||
1233                             strcmp(value, "class") == 0) {
1234                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1235                                         log_error("'%s' must be specified as 'subsystem' \n"
1236                                             "please fix it in %s:%u", value, filename, lineno);
1237                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1238                         } else
1239                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1240                         continue;
1241                 }
1242
1243                 if (strcmp(key, "DRIVER") == 0) {
1244                         if (op > OP_MATCH_MAX) {
1245                                 log_error("invalid DRIVER operation\n");
1246                                 goto invalid;
1247                         }
1248                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1249                         continue;
1250                 }
1251
1252                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1253                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1254                         if (attr == NULL) {
1255                                 log_error("error parsing ATTR attribute\n");
1256                                 goto invalid;
1257                         }
1258                         if (op < OP_MATCH_MAX) {
1259                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1260                         } else {
1261                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1262                         }
1263                         continue;
1264                 }
1265
1266                 if (strcmp(key, "KERNELS") == 0) {
1267                         if (op > OP_MATCH_MAX) {
1268                                 log_error("invalid KERNELS operation\n");
1269                                 goto invalid;
1270                         }
1271                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1272                         continue;
1273                 }
1274
1275                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1276                         if (op > OP_MATCH_MAX) {
1277                                 log_error("invalid SUBSYSTEMS operation\n");
1278                                 goto invalid;
1279                         }
1280                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1281                         continue;
1282                 }
1283
1284                 if (strcmp(key, "DRIVERS") == 0) {
1285                         if (op > OP_MATCH_MAX) {
1286                                 log_error("invalid DRIVERS operation\n");
1287                                 goto invalid;
1288                         }
1289                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1290                         continue;
1291                 }
1292
1293                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1294                         if (op > OP_MATCH_MAX) {
1295                                 log_error("invalid ATTRS operation\n");
1296                                 goto invalid;
1297                         }
1298                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1299                         if (attr == NULL) {
1300                                 log_error("error parsing ATTRS attribute\n");
1301                                 goto invalid;
1302                         }
1303                         if (strncmp(attr, "device/", 7) == 0)
1304                                 log_error("the 'device' link may not be available in a future kernel, "
1305                                     "please fix it in %s:%u", filename, lineno);
1306                         else if (strstr(attr, "../") != NULL)
1307                                 log_error("do not reference parent sysfs directories directly, "
1308                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1309                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1310                         continue;
1311                 }
1312
1313                 if (strcmp(key, "TAGS") == 0) {
1314                         if (op > OP_MATCH_MAX) {
1315                                 log_error("invalid TAGS operation\n");
1316                                 goto invalid;
1317                         }
1318                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1319                         continue;
1320                 }
1321
1322                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1323                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1324                         if (attr == NULL) {
1325                                 log_error("error parsing ENV attribute\n");
1326                                 goto invalid;
1327                         }
1328                         if (op < OP_MATCH_MAX) {
1329                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1330                                         goto invalid;
1331                         } else {
1332                                 static const char *blacklist[] = {
1333                                         "ACTION",
1334                                         "SUBSYSTEM",
1335                                         "DEVTYPE",
1336                                         "MAJOR",
1337                                         "MINOR",
1338                                         "DRIVER",
1339                                         "IFINDEX",
1340                                         "DEVNAME",
1341                                         "DEVLINKS",
1342                                         "DEVPATH",
1343                                         "TAGS",
1344                                 };
1345                                 unsigned int i;
1346
1347                                 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1348                                         if (strcmp(attr, blacklist[i]) == 0) {
1349                                                 log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1350                                                 continue;
1351                                         }
1352                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1353                                         goto invalid;
1354                         }
1355                         continue;
1356                 }
1357
1358                 if (strcmp(key, "TAG") == 0) {
1359                         if (op < OP_MATCH_MAX)
1360                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1361                         else
1362                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1363                         continue;
1364                 }
1365
1366                 if (strcmp(key, "PROGRAM") == 0) {
1367                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1368                         continue;
1369                 }
1370
1371                 if (strcmp(key, "RESULT") == 0) {
1372                         if (op > OP_MATCH_MAX) {
1373                                 log_error("invalid RESULT operation\n");
1374                                 goto invalid;
1375                         }
1376                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1377                         continue;
1378                 }
1379
1380                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1381                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1382                         if (attr == NULL) {
1383                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1384                                 continue;
1385                         }
1386                         if (strcmp(attr, "program") == 0) {
1387                                 /* find known built-in command */
1388                                 if (value[0] != '/') {
1389                                         enum udev_builtin_cmd cmd;
1390
1391                                         cmd = udev_builtin_lookup(value);
1392                                         if (cmd < UDEV_BUILTIN_MAX) {
1393                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1394                                                           value, filename, lineno);
1395                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1396                                                 continue;
1397                                         }
1398                                 }
1399                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1400                         } else if (strcmp(attr, "builtin") == 0) {
1401                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1402
1403                                 if (cmd < UDEV_BUILTIN_MAX)
1404                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1405                                 else
1406                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1407                         } else if (strcmp(attr, "file") == 0) {
1408                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1409                         } else if (strcmp(attr, "db") == 0) {
1410                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1411                         } else if (strcmp(attr, "cmdline") == 0) {
1412                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1413                         } else if (strcmp(attr, "parent") == 0) {
1414                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1415                         } else
1416                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1417                         continue;
1418                 }
1419
1420                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1421                         mode_t mode = 0;
1422
1423                         if (op > OP_MATCH_MAX) {
1424                                 log_error("invalid TEST operation\n");
1425                                 goto invalid;
1426                         }
1427                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1428                         if (attr != NULL) {
1429                                 mode = strtol(attr, NULL, 8);
1430                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1431                         } else {
1432                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1433                         }
1434                         continue;
1435                 }
1436
1437                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1438                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1439                         if (attr == NULL)
1440                                 attr = "program";
1441
1442                         if (strcmp(attr, "builtin") == 0) {
1443                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1444
1445                                 if (cmd < UDEV_BUILTIN_MAX)
1446                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1447                                 else
1448                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1449                         } else if (strcmp(attr, "program") == 0) {
1450                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1451
1452                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1453                         } else {
1454                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1455                         }
1456
1457                         continue;
1458                 }
1459
1460                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1461                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1462                         continue;
1463                 }
1464
1465                 if (strcmp(key, "LABEL") == 0) {
1466                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1467                         continue;
1468                 }
1469
1470                 if (strcmp(key, "GOTO") == 0) {
1471                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1472                         continue;
1473                 }
1474
1475                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1476                         if (op < OP_MATCH_MAX) {
1477                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1478                         } else {
1479                                 if (strcmp(value, "%k") == 0) {
1480                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1481                                             "please remove it from %s:%u\n", filename, lineno);
1482                                         continue;
1483                                 }
1484                                 if (value[0] == '\0') {
1485                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1486                                                   "please remove it from %s:%u\n", filename, lineno);
1487                                         continue;
1488                                 }
1489                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1490                         }
1491                         rule_tmp.rule.rule.can_set_name = true;
1492                         continue;
1493                 }
1494
1495                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1496                         if (op < OP_MATCH_MAX) {
1497                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1498                         } else {
1499                                 int flag = 0;
1500
1501                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1502                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1503                                         flag = 1;
1504                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1505                         }
1506                         rule_tmp.rule.rule.can_set_name = true;
1507                         continue;
1508                 }
1509
1510                 if (strcmp(key, "OWNER") == 0) {
1511                         uid_t uid;
1512                         char *endptr;
1513
1514                         uid = strtoul(value, &endptr, 10);
1515                         if (endptr[0] == '\0') {
1516                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1517                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1518                                 uid = add_uid(rules, value);
1519                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1520                         } else if (rules->resolve_names >= 0) {
1521                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1522                         }
1523                         rule_tmp.rule.rule.can_set_name = true;
1524                         continue;
1525                 }
1526
1527                 if (strcmp(key, "GROUP") == 0) {
1528                         gid_t gid;
1529                         char *endptr;
1530
1531                         gid = strtoul(value, &endptr, 10);
1532                         if (endptr[0] == '\0') {
1533                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1534                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1535                                 gid = add_gid(rules, value);
1536                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1537                         } else if (rules->resolve_names >= 0) {
1538                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1539                         }
1540                         rule_tmp.rule.rule.can_set_name = true;
1541                         continue;
1542                 }
1543
1544                 if (strcmp(key, "MODE") == 0) {
1545                         mode_t mode;
1546                         char *endptr;
1547
1548                         mode = strtol(value, &endptr, 8);
1549                         if (endptr[0] == '\0')
1550                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1551                         else
1552                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1553                         rule_tmp.rule.rule.can_set_name = true;
1554                         continue;
1555                 }
1556
1557                 if (strcmp(key, "OPTIONS") == 0) {
1558                         const char *pos;
1559
1560                         pos = strstr(value, "link_priority=");
1561                         if (pos != NULL) {
1562                                 int prio = atoi(&pos[strlen("link_priority=")]);
1563
1564                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1565                         }
1566
1567                         pos = strstr(value, "event_timeout=");
1568                         if (pos != NULL) {
1569                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1570
1571                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1572                         }
1573
1574                         pos = strstr(value, "string_escape=");
1575                         if (pos != NULL) {
1576                                 pos = &pos[strlen("string_escape=")];
1577                                 if (strncmp(pos, "none", strlen("none")) == 0)
1578                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1579                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1580                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1581                         }
1582
1583                         pos = strstr(value, "db_persist");
1584                         if (pos != NULL)
1585                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1586
1587                         pos = strstr(value, "nowatch");
1588                         if (pos != NULL) {
1589                                 const int off = 0;
1590
1591                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1592                         } else {
1593                                 pos = strstr(value, "watch");
1594                                 if (pos != NULL) {
1595                                         const int on = 1;
1596
1597                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1598                                 }
1599                         }
1600
1601                         pos = strstr(value, "static_node=");
1602                         if (pos != NULL) {
1603                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1604                                 rule_tmp.rule.rule.has_static_node = true;
1605                         }
1606
1607                         continue;
1608                 }
1609
1610                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1611                 goto invalid;
1612         }
1613
1614         /* add rule token */
1615         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1616         if (add_token(rules, &rule_tmp.rule) != 0)
1617                 goto invalid;
1618
1619         /* add tokens to list, sorted by type */
1620         if (sort_token(rules, &rule_tmp) != 0)
1621                 goto invalid;
1622
1623         return 0;
1624 invalid:
1625         log_error("invalid rule '%s:%u'\n", filename, lineno);
1626         return -1;
1627 }
1628
1629 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1630 {
1631         FILE *f;
1632         unsigned int first_token;
1633         char line[UTIL_LINE_SIZE];
1634         int line_nr = 0;
1635         unsigned int i;
1636
1637         log_debug("reading '%s' as rules file\n", filename);
1638
1639         f = fopen(filename, "r");
1640         if (f == NULL)
1641                 return -1;
1642
1643         first_token = rules->token_cur;
1644
1645         while (fgets(line, sizeof(line), f) != NULL) {
1646                 char *key;
1647                 size_t len;
1648
1649                 /* skip whitespace */
1650                 line_nr++;
1651                 key = line;
1652                 while (isspace(key[0]))
1653                         key++;
1654
1655                 /* comment */
1656                 if (key[0] == '#')
1657                         continue;
1658
1659                 len = strlen(line);
1660                 if (len < 3)
1661                         continue;
1662
1663                 /* continue reading if backslash+newline is found */
1664                 while (line[len-2] == '\\') {
1665                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1666                                 break;
1667                         if (strlen(&line[len-2]) < 2)
1668                                 break;
1669                         line_nr++;
1670                         len = strlen(line);
1671                 }
1672
1673                 if (len+1 >= sizeof(line)) {
1674                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1675                         continue;
1676                 }
1677                 add_rule(rules, key, filename, filename_off, line_nr);
1678         }
1679         fclose(f);
1680
1681         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1682         for (i = first_token+1; i < rules->token_cur; i++) {
1683                 if (rules->tokens[i].type == TK_A_GOTO) {
1684                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1685                         unsigned int j;
1686
1687                         for (j = i+1; j < rules->token_cur; j++) {
1688                                 if (rules->tokens[j].type != TK_RULE)
1689                                         continue;
1690                                 if (rules->tokens[j].rule.label_off == 0)
1691                                         continue;
1692                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1693                                         continue;
1694                                 rules->tokens[i].key.rule_goto = j;
1695                                 break;
1696                         }
1697                         if (rules->tokens[i].key.rule_goto == 0)
1698                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1699                 }
1700         }
1701         return 0;
1702 }
1703
1704 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1705 {
1706         DIR *dir;
1707         struct dirent *dent;
1708         char filename[UTIL_PATH_SIZE];
1709
1710         dir = opendir(dirname);
1711         if (dir == NULL) {
1712                 log_debug("unable to open '%s': %m\n", dirname);
1713                 return -1;
1714         }
1715
1716         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1717                 if (dent->d_name[0] == '.')
1718                         continue;
1719
1720                 /* look for file matching with specified suffix */
1721                 if (suffix != NULL) {
1722                         const char *ext;
1723
1724                         ext = strrchr(dent->d_name, '.');
1725                         if (ext == NULL)
1726                                 continue;
1727                         if (strcmp(ext, suffix) != 0)
1728                                 continue;
1729                 }
1730                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1731                 /*
1732                  * the basename is the key, the filename the value
1733                  * identical basenames from different directories override each other
1734                  * entries are sorted after basename
1735                  */
1736                 udev_list_entry_add(file_list, dent->d_name, filename);
1737         }
1738
1739         closedir(dir);
1740         return 0;
1741 }
1742
1743 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1744 {
1745         struct udev_rules *rules;
1746         struct udev_list file_list;
1747         struct udev_list_entry *file_loop;
1748         struct token end_token;
1749         char **s;
1750
1751         rules = calloc(1, sizeof(struct udev_rules));
1752         if (rules == NULL)
1753                 return NULL;
1754         rules->udev = udev;
1755         rules->resolve_names = resolve_names;
1756         udev_list_init(udev, &file_list, true);
1757
1758         /* init token array and string buffer */
1759         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1760         if (rules->tokens == NULL) {
1761                 free(rules);
1762                 return NULL;
1763         }
1764         rules->token_max = PREALLOC_TOKEN;
1765
1766         rules->buf = malloc(PREALLOC_STRBUF);
1767         if (rules->buf == NULL) {
1768                 free(rules->tokens);
1769                 free(rules);
1770                 return NULL;
1771         }
1772         rules->buf_max = PREALLOC_STRBUF;
1773         /* offset 0 is always '\0' */
1774         rules->buf[0] = '\0';
1775         rules->buf_cur = 1;
1776
1777         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1778         if (rules->trie_nodes == NULL) {
1779                 free(rules->buf);
1780                 free(rules->tokens);
1781                 free(rules);
1782                 return NULL;
1783         }
1784         rules->trie_nodes_max = PREALLOC_TRIE;
1785         /* offset 0 is the trie root, with an empty string */
1786         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1787         rules->trie_nodes_cur = 1;
1788
1789         for (udev_get_rules_path(udev, &s, NULL); *s != NULL; s++)
1790                 add_matching_files(udev, &file_list, *s, ".rules");
1791
1792         /* add all filenames to the string buffer */
1793         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1794                 const char *filename = udev_list_entry_get_value(file_loop);
1795                 unsigned int filename_off;
1796
1797                 filename_off = add_string(rules, filename);
1798                 /* the offset in the rule is limited to unsigned short */
1799                 if (filename_off < USHRT_MAX)
1800                         udev_list_entry_set_num(file_loop, filename_off);
1801         }
1802
1803         /* parse all rules files */
1804         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1805                 const char *filename = udev_list_entry_get_value(file_loop);
1806                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1807                 struct stat st;
1808
1809                 if (stat(filename, &st) != 0) {
1810                         log_error("can not find '%s': %m\n", filename);
1811                         continue;
1812                 }
1813                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1814                         log_debug("ignore empty '%s'\n", filename);
1815                         continue;
1816                 }
1817                 if (S_ISCHR(st.st_mode)) {
1818                         log_debug("ignore masked '%s'\n", filename);
1819                         continue;
1820                 }
1821                 parse_file(rules, filename, filename_off);
1822         }
1823         udev_list_cleanup(&file_list);
1824
1825         memset(&end_token, 0x00, sizeof(struct token));
1826         end_token.type = TK_END;
1827         add_token(rules, &end_token);
1828
1829         /* shrink allocated token and string buffer */
1830         if (rules->token_cur < rules->token_max) {
1831                 struct token *tokens;
1832
1833                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1834                 if (tokens != NULL || rules->token_cur == 0) {
1835                         rules->tokens = tokens;
1836                         rules->token_max = rules->token_cur;
1837                 }
1838         }
1839         if (rules->buf_cur < rules->buf_max) {
1840                 char *buf;
1841
1842                 buf = realloc(rules->buf, rules->buf_cur);
1843                 if (buf != NULL || rules->buf_cur == 0) {
1844                         rules->buf = buf;
1845                         rules->buf_max = rules->buf_cur;
1846                 }
1847         }
1848         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1849                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1850         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1851                   rules->trie_nodes_cur * sizeof(struct trie_node),
1852                   rules->trie_nodes_cur, sizeof(struct trie_node));
1853
1854         /* cleanup trie */
1855         free(rules->trie_nodes);
1856         rules->trie_nodes = NULL;
1857         rules->trie_nodes_cur = 0;
1858         rules->trie_nodes_max = 0;
1859
1860         /* cleanup uid/gid cache */
1861         free(rules->uids);
1862         rules->uids = NULL;
1863         rules->uids_cur = 0;
1864         rules->uids_max = 0;
1865         free(rules->gids);
1866         rules->gids = NULL;
1867         rules->gids_cur = 0;
1868         rules->gids_max = 0;
1869
1870         dump_rules(rules);
1871         return rules;
1872 }
1873
1874 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1875 {
1876         if (rules == NULL)
1877                 return NULL;
1878         free(rules->tokens);
1879         free(rules->buf);
1880         free(rules->trie_nodes);
1881         free(rules->uids);
1882         free(rules->gids);
1883         free(rules);
1884         return NULL;
1885 }
1886
1887 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1888 {
1889         char *key_value = &rules->buf[token->key.value_off];
1890         char *pos;
1891         bool match = false;
1892
1893         if (val == NULL)
1894                 val = "";
1895
1896         switch (token->key.glob) {
1897         case GL_PLAIN:
1898                 match = (strcmp(key_value, val) == 0);
1899                 break;
1900         case GL_GLOB:
1901                 match = (fnmatch(key_value, val, 0) == 0);
1902                 break;
1903         case GL_SPLIT:
1904                 {
1905                         const char *split;
1906                         size_t len;
1907
1908                         split = &rules->buf[token->key.value_off];
1909                         len = strlen(val);
1910                         for (;;) {
1911                                 const char *next;
1912
1913                                 next = strchr(split, '|');
1914                                 if (next != NULL) {
1915                                         size_t matchlen = (size_t)(next - split);
1916
1917                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1918                                         if (match)
1919                                                 break;
1920                                 } else {
1921                                         match = (strcmp(split, val) == 0);
1922                                         break;
1923                                 }
1924                                 split = &next[1];
1925                         }
1926                         break;
1927                 }
1928         case GL_SPLIT_GLOB:
1929                 {
1930                         char value[UTIL_PATH_SIZE];
1931
1932                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1933                         key_value = value;
1934                         while (key_value != NULL) {
1935                                 pos = strchr(key_value, '|');
1936                                 if (pos != NULL) {
1937                                         pos[0] = '\0';
1938                                         pos = &pos[1];
1939                                 }
1940                                 match = (fnmatch(key_value, val, 0) == 0);
1941                                 if (match)
1942                                         break;
1943                                 key_value = pos;
1944                         }
1945                         break;
1946                 }
1947         case GL_SOMETHING:
1948                 match = (val[0] != '\0');
1949                 break;
1950         case GL_UNSET:
1951                 return -1;
1952         }
1953
1954         if (match && (token->key.op == OP_MATCH))
1955                 return 0;
1956         if (!match && (token->key.op == OP_NOMATCH))
1957                 return 0;
1958         return -1;
1959 }
1960
1961 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1962 {
1963         const char *name;
1964         char nbuf[UTIL_NAME_SIZE];
1965         const char *value;
1966         char vbuf[UTIL_NAME_SIZE];
1967         size_t len;
1968
1969         name = &rules->buf[cur->key.attr_off];
1970         switch (cur->key.attrsubst) {
1971         case SB_FORMAT:
1972                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1973                 name = nbuf;
1974                 /* fall through */
1975         case SB_NONE:
1976                 value = udev_device_get_sysattr_value(dev, name);
1977                 if (value == NULL)
1978                         return -1;
1979                 break;
1980         case SB_SUBSYS:
1981                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1982                         return -1;
1983                 value = vbuf;
1984                 break;
1985         default:
1986                 return -1;
1987         }
1988
1989         /* remove trailing whitespace, if not asked to match for it */
1990         len = strlen(value);
1991         if (len > 0 && isspace(value[len-1])) {
1992                 const char *key_value;
1993                 size_t klen;
1994
1995                 key_value = &rules->buf[cur->key.value_off];
1996                 klen = strlen(key_value);
1997                 if (klen > 0 && !isspace(key_value[klen-1])) {
1998                         if (value != vbuf) {
1999                                 util_strscpy(vbuf, sizeof(vbuf), value);
2000                                 value = vbuf;
2001                         }
2002                         while (len > 0 && isspace(vbuf[--len]))
2003                                 vbuf[len] = '\0';
2004                 }
2005         }
2006
2007         return match_key(rules, cur, value);
2008 }
2009
2010 enum escape_type {
2011         ESCAPE_UNSET,
2012         ESCAPE_NONE,
2013         ESCAPE_REPLACE,
2014 };
2015
2016 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2017 {
2018         struct token *cur;
2019         struct token *rule;
2020         enum escape_type esc = ESCAPE_UNSET;
2021         bool can_set_name;
2022
2023         if (rules->tokens == NULL)
2024                 return -1;
2025
2026         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2027                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2028                          udev_device_get_ifindex(event->dev) > 0));
2029
2030         /* loop through token list, match, run actions or forward to next rule */
2031         cur = &rules->tokens[0];
2032         rule = cur;
2033         for (;;) {
2034                 dump_token(rules, cur);
2035                 switch (cur->type) {
2036                 case TK_RULE:
2037                         /* current rule */
2038                         rule = cur;
2039                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2040                         if (!can_set_name && rule->rule.can_set_name)
2041                                 goto nomatch;
2042                         esc = ESCAPE_UNSET;
2043                         break;
2044                 case TK_M_ACTION:
2045                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2046                                 goto nomatch;
2047                         break;
2048                 case TK_M_DEVPATH:
2049                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2050                                 goto nomatch;
2051                         break;
2052                 case TK_M_KERNEL:
2053                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2054                                 goto nomatch;
2055                         break;
2056                 case TK_M_DEVLINK: {
2057                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2058                         struct udev_list_entry *list_entry;
2059                         bool match = false;
2060
2061                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2062                                 const char *devlink;
2063
2064                                 devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2065                                 if (match_key(rules, cur, devlink) == 0) {
2066                                         match = true;
2067                                         break;
2068                                 }
2069                         }
2070                         if (!match)
2071                                 goto nomatch;
2072                         break;
2073                 }
2074                 case TK_M_NAME:
2075                         if (match_key(rules, cur, event->name) != 0)
2076                                 goto nomatch;
2077                         break;
2078                 case TK_M_ENV: {
2079                         const char *key_name = &rules->buf[cur->key.attr_off];
2080                         const char *value;
2081
2082                         value = udev_device_get_property_value(event->dev, key_name);
2083                         if (value == NULL)
2084                                 value = "";
2085                         if (match_key(rules, cur, value))
2086                                 goto nomatch;
2087                         break;
2088                 }
2089                 case TK_M_TAG: {
2090                         struct udev_list_entry *list_entry;
2091                         bool match = false;
2092
2093                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2094                                 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2095                                         match = true;
2096                                         break;
2097                                 }
2098                         }
2099                         if (!match && (cur->key.op != OP_NOMATCH))
2100                                 goto nomatch;
2101                         break;
2102                 }
2103                 case TK_M_SUBSYSTEM:
2104                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2105                                 goto nomatch;
2106                         break;
2107                 case TK_M_DRIVER:
2108                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2109                                 goto nomatch;
2110                         break;
2111                 case TK_M_WAITFOR: {
2112                         char filename[UTIL_PATH_SIZE];
2113                         int found;
2114
2115                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2116                         found = (wait_for_file(event->dev, filename, 10) == 0);
2117                         if (!found && (cur->key.op != OP_NOMATCH))
2118                                 goto nomatch;
2119                         break;
2120                 }
2121                 case TK_M_ATTR:
2122                         if (match_attr(rules, event->dev, event, cur) != 0)
2123                                 goto nomatch;
2124                         break;
2125                 case TK_M_KERNELS:
2126                 case TK_M_SUBSYSTEMS:
2127                 case TK_M_DRIVERS:
2128                 case TK_M_ATTRS:
2129                 case TK_M_TAGS: {
2130                         struct token *next;
2131
2132                         /* get whole sequence of parent matches */
2133                         next = cur;
2134                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2135                                 next++;
2136
2137                         /* loop over parents */
2138                         event->dev_parent = event->dev;
2139                         for (;;) {
2140                                 struct token *key;
2141
2142                                 /* loop over sequence of parent match keys */
2143                                 for (key = cur; key < next; key++ ) {
2144                                         dump_token(rules, key);
2145                                         switch(key->type) {
2146                                         case TK_M_KERNELS:
2147                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2148                                                         goto try_parent;
2149                                                 break;
2150                                         case TK_M_SUBSYSTEMS:
2151                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2152                                                         goto try_parent;
2153                                                 break;
2154                                         case TK_M_DRIVERS:
2155                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2156                                                         goto try_parent;
2157                                                 break;
2158                                         case TK_M_ATTRS:
2159                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2160                                                         goto try_parent;
2161                                                 break;
2162                                         case TK_M_TAGS: {
2163                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2164
2165                                                 if (match && key->key.op == OP_NOMATCH)
2166                                                         goto try_parent;
2167                                                 if (!match && key->key.op == OP_MATCH)
2168                                                         goto try_parent;
2169                                                 break;
2170                                         }
2171                                         default:
2172                                                 goto nomatch;
2173                                         }
2174                                 }
2175                                 break;
2176
2177                         try_parent:
2178                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2179                                 if (event->dev_parent == NULL)
2180                                         goto nomatch;
2181                         }
2182                         /* move behind our sequence of parent match keys */
2183                         cur = next;
2184                         continue;
2185                 }
2186                 case TK_M_TEST: {
2187                         char filename[UTIL_PATH_SIZE];
2188                         struct stat statbuf;
2189                         int match;
2190
2191                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2192                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2193                                 if (filename[0] != '/') {
2194                                         char tmp[UTIL_PATH_SIZE];
2195
2196                                         util_strscpy(tmp, sizeof(tmp), filename);
2197                                         util_strscpyl(filename, sizeof(filename),
2198                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2199                                 }
2200                         }
2201                         attr_subst_subdir(filename, sizeof(filename));
2202
2203                         match = (stat(filename, &statbuf) == 0);
2204                         if (match && cur->key.mode > 0)
2205                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2206                         if (match && cur->key.op == OP_NOMATCH)
2207                                 goto nomatch;
2208                         if (!match && cur->key.op == OP_MATCH)
2209                                 goto nomatch;
2210                         break;
2211                 }
2212                 case TK_M_EVENT_TIMEOUT:
2213                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2214                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2215                         break;
2216                 case TK_M_PROGRAM: {
2217                         char program[UTIL_PATH_SIZE];
2218                         char **envp;
2219                         char result[UTIL_PATH_SIZE];
2220
2221                         free(event->program_result);
2222                         event->program_result = NULL;
2223                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2224                         envp = udev_device_get_properties_envp(event->dev);
2225                         log_debug("PROGRAM '%s' %s:%u\n",
2226                                   program,
2227                                   &rules->buf[rule->rule.filename_off],
2228                                   rule->rule.filename_line);
2229
2230                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2231                                 if (cur->key.op != OP_NOMATCH)
2232                                         goto nomatch;
2233                         } else {
2234                                 int count;
2235
2236                                 util_remove_trailing_chars(result, '\n');
2237                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2238                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2239                                         if (count > 0)
2240                                                 log_debug("%i character(s) replaced\n" , count);
2241                                 }
2242                                 event->program_result = strdup(result);
2243                                 if (cur->key.op == OP_NOMATCH)
2244                                         goto nomatch;
2245                         }
2246                         break;
2247                 }
2248                 case TK_M_IMPORT_FILE: {
2249                         char import[UTIL_PATH_SIZE];
2250
2251                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2252                         if (import_file_into_properties(event->dev, import) != 0)
2253                                 if (cur->key.op != OP_NOMATCH)
2254                                         goto nomatch;
2255                         break;
2256                 }
2257                 case TK_M_IMPORT_PROG: {
2258                         char import[UTIL_PATH_SIZE];
2259
2260                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2261                         log_debug("IMPORT '%s' %s:%u\n",
2262                                   import,
2263                                   &rules->buf[rule->rule.filename_off],
2264                                   rule->rule.filename_line);
2265
2266                         if (import_program_into_properties(event, import, sigmask) != 0)
2267                                 if (cur->key.op != OP_NOMATCH)
2268                                         goto nomatch;
2269                         break;
2270                 }
2271                 case TK_M_IMPORT_BUILTIN: {
2272                         char command[UTIL_PATH_SIZE];
2273
2274                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2275                                 /* check if we ran already */
2276                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2277                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2278                                                   udev_builtin_name(cur->key.builtin_cmd),
2279                                                   &rules->buf[rule->rule.filename_off],
2280                                                   rule->rule.filename_line);
2281                                         /* return the result from earlier run */
2282                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2283                                         if (cur->key.op != OP_NOMATCH)
2284                                                         goto nomatch;
2285                                         break;
2286                                 }
2287                                 /* mark as ran */
2288                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2289                         }
2290
2291                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2292                         log_debug("IMPORT builtin '%s' %s:%u\n",
2293                                   udev_builtin_name(cur->key.builtin_cmd),
2294                                   &rules->buf[rule->rule.filename_off],
2295                                   rule->rule.filename_line);
2296
2297                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2298                                 /* remember failure */
2299                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2300                                           udev_builtin_name(cur->key.builtin_cmd));
2301                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2302                                 if (cur->key.op != OP_NOMATCH)
2303                                         goto nomatch;
2304                         }
2305                         break;
2306                 }
2307                 case TK_M_IMPORT_DB: {
2308                         const char *key = &rules->buf[cur->key.value_off];
2309                         const char *value;
2310
2311                         value = udev_device_get_property_value(event->dev_db, key);
2312                         if (value != NULL) {
2313                                 struct udev_list_entry *entry;
2314
2315                                 entry = udev_device_add_property(event->dev, key, value);
2316                                 udev_list_entry_set_num(entry, true);
2317                         } else {
2318                                 if (cur->key.op != OP_NOMATCH)
2319                                         goto nomatch;
2320                         }
2321                         break;
2322                 }
2323                 case TK_M_IMPORT_CMDLINE: {
2324                         FILE *f;
2325                         bool imported = false;
2326
2327                         f = fopen("/proc/cmdline", "r");
2328                         if (f != NULL) {
2329                                 char cmdline[4096];
2330
2331                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2332                                         const char *key = &rules->buf[cur->key.value_off];
2333                                         char *pos;
2334
2335                                         pos = strstr(cmdline, key);
2336                                         if (pos != NULL) {
2337                                                 struct udev_list_entry *entry;
2338
2339                                                 pos += strlen(key);
2340                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2341                                                         /* we import simple flags as 'FLAG=1' */
2342                                                         entry = udev_device_add_property(event->dev, key, "1");
2343                                                         udev_list_entry_set_num(entry, true);
2344                                                         imported = true;
2345                                                 } else if (pos[0] == '=') {
2346                                                         const char *value;
2347
2348                                                         pos++;
2349                                                         value = pos;
2350                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2351                                                                 pos++;
2352                                                         pos[0] = '\0';
2353                                                         entry = udev_device_add_property(event->dev, key, value);
2354                                                         udev_list_entry_set_num(entry, true);
2355                                                         imported = true;
2356                                                 }
2357                                         }
2358                                 }
2359                                 fclose(f);
2360                         }
2361                         if (!imported && cur->key.op != OP_NOMATCH)
2362                                 goto nomatch;
2363                         break;
2364                 }
2365                 case TK_M_IMPORT_PARENT: {
2366                         char import[UTIL_PATH_SIZE];
2367
2368                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2369                         if (import_parent_into_properties(event->dev, import) != 0)
2370                                 if (cur->key.op != OP_NOMATCH)
2371                                         goto nomatch;
2372                         break;
2373                 }
2374                 case TK_M_RESULT:
2375                         if (match_key(rules, cur, event->program_result) != 0)
2376                                 goto nomatch;
2377                         break;
2378                 case TK_A_STRING_ESCAPE_NONE:
2379                         esc = ESCAPE_NONE;
2380                         break;
2381                 case TK_A_STRING_ESCAPE_REPLACE:
2382                         esc = ESCAPE_REPLACE;
2383                         break;
2384                 case TK_A_DB_PERSIST:
2385                         udev_device_set_db_persist(event->dev);
2386                         break;
2387                 case TK_A_INOTIFY_WATCH:
2388                         if (event->inotify_watch_final)
2389                                 break;
2390                         if (cur->key.op == OP_ASSIGN_FINAL)
2391                                 event->inotify_watch_final = true;
2392                         event->inotify_watch = cur->key.watch;
2393                         break;
2394                 case TK_A_DEVLINK_PRIO:
2395                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2396                         break;
2397                 case TK_A_OWNER: {
2398                         char owner[UTIL_NAME_SIZE];
2399
2400                         if (event->owner_final)
2401                                 break;
2402                         if (cur->key.op == OP_ASSIGN_FINAL)
2403                                 event->owner_final = true;
2404                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2405                         event->uid = util_lookup_user(event->udev, owner);
2406                         log_debug("OWNER %u %s:%u\n",
2407                                   event->uid,
2408                                   &rules->buf[rule->rule.filename_off],
2409                                   rule->rule.filename_line);
2410                         break;
2411                 }
2412                 case TK_A_GROUP: {
2413                         char group[UTIL_NAME_SIZE];
2414
2415                         if (event->group_final)
2416                                 break;
2417                         if (cur->key.op == OP_ASSIGN_FINAL)
2418                                 event->group_final = true;
2419                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2420                         event->gid = util_lookup_group(event->udev, group);
2421                         log_debug("GROUP %u %s:%u\n",
2422                                   event->gid,
2423                                   &rules->buf[rule->rule.filename_off],
2424                                   rule->rule.filename_line);
2425                         break;
2426                 }
2427                 case TK_A_MODE: {
2428                         char mode_str[UTIL_NAME_SIZE];
2429                         mode_t mode;
2430                         char *endptr;
2431
2432                         if (event->mode_final)
2433                                 break;
2434                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2435                         mode = strtol(mode_str, &endptr, 8);
2436                         if (endptr[0] != '\0') {
2437                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2438                                 break;
2439                         }
2440                         if (cur->key.op == OP_ASSIGN_FINAL)
2441                                 event->mode_final = true;
2442                         event->mode_set = true;
2443                         event->mode = mode;
2444                         log_debug("MODE %#o %s:%u\n",
2445                                   event->mode,
2446                                   &rules->buf[rule->rule.filename_off],
2447                                   rule->rule.filename_line);
2448                         break;
2449                 }
2450                 case TK_A_OWNER_ID:
2451                         if (event->owner_final)
2452                                 break;
2453                         if (cur->key.op == OP_ASSIGN_FINAL)
2454                                 event->owner_final = true;
2455                         event->uid = cur->key.uid;
2456                         log_debug("OWNER %u %s:%u\n",
2457                                   event->uid,
2458                                   &rules->buf[rule->rule.filename_off],
2459                                   rule->rule.filename_line);
2460                         break;
2461                 case TK_A_GROUP_ID:
2462                         if (event->group_final)
2463                                 break;
2464                         if (cur->key.op == OP_ASSIGN_FINAL)
2465                                 event->group_final = true;
2466                         event->gid = cur->key.gid;
2467                         log_debug("GROUP %u %s:%u\n",
2468                                   event->gid,
2469                                   &rules->buf[rule->rule.filename_off],
2470                                   rule->rule.filename_line);
2471                         break;
2472                 case TK_A_MODE_ID:
2473                         if (event->mode_final)
2474                                 break;
2475                         if (cur->key.op == OP_ASSIGN_FINAL)
2476                                 event->mode_final = true;
2477                         event->mode_set = true;
2478                         event->mode = cur->key.mode;
2479                         log_debug("MODE %#o %s:%u\n",
2480                                   event->mode,
2481                                   &rules->buf[rule->rule.filename_off],
2482                                   rule->rule.filename_line);
2483                         break;
2484                 case TK_A_ENV: {
2485                         const char *name = &rules->buf[cur->key.attr_off];
2486                         char *value = &rules->buf[cur->key.value_off];
2487
2488                         if (value[0] != '\0') {
2489                                 char temp_value[UTIL_NAME_SIZE];
2490                                 struct udev_list_entry *entry;
2491
2492                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2493                                 entry = udev_device_add_property(event->dev, name, temp_value);
2494                                 /* store in db, skip private keys */
2495                                 if (name[0] != '.')
2496                                         udev_list_entry_set_num(entry, true);
2497                         } else {
2498                                 udev_device_add_property(event->dev, name, NULL);
2499                         }
2500                         break;
2501                 }
2502                 case TK_A_TAG: {
2503                         char tag[UTIL_PATH_SIZE];
2504                         const char *p;
2505
2506                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2507                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2508                                 udev_device_cleanup_tags_list(event->dev);
2509                         for (p = tag; *p != '\0'; p++) {
2510                                 if ((*p >= 'a' && *p <= 'z') ||
2511                                     (*p >= 'A' && *p <= 'Z') ||
2512                                     (*p >= '0' && *p <= '9') ||
2513                                     *p == '-' || *p == '_')
2514                                         continue;
2515                                 log_error("ignoring invalid tag name '%s'\n", tag);
2516                                 break;
2517                         }
2518                         udev_device_add_tag(event->dev, tag);
2519                         break;
2520                 }
2521                 case TK_A_NAME: {
2522                         const char *name  = &rules->buf[cur->key.value_off];
2523
2524                         char name_str[UTIL_PATH_SIZE];
2525                         int count;
2526
2527                         if (event->name_final)
2528                                 break;
2529                         if (cur->key.op == OP_ASSIGN_FINAL)
2530                                 event->name_final = true;
2531                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2532                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2533                                 count = util_replace_chars(name_str, "/");
2534                                 if (count > 0)
2535                                         log_debug("%i character(s) replaced\n", count);
2536                         }
2537                         if (major(udev_device_get_devnum(event->dev))) {
2538                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2539
2540                                 if (strcmp(name_str, &udev_device_get_devnode(event->dev)[devlen]) != 0) {
2541                                         log_error("NAME=\"%s\" ignored, kernel device nodes "
2542                                             "can not be renamed; please fix it in %s:%u\n", name,
2543                                             &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2544                                         break;
2545                                 }
2546                         }
2547                         free(event->name);
2548                         event->name = strdup(name_str);
2549                         log_debug("NAME '%s' %s:%u\n",
2550                                   event->name,
2551                                   &rules->buf[rule->rule.filename_off],
2552                                   rule->rule.filename_line);
2553                         break;
2554                 }
2555                 case TK_A_DEVLINK: {
2556                         char temp[UTIL_PATH_SIZE];
2557                         char filename[UTIL_PATH_SIZE];
2558                         char *pos, *next;
2559                         int count = 0;
2560
2561                         if (event->devlink_final)
2562                                 break;
2563                         if (major(udev_device_get_devnum(event->dev)) == 0)
2564                                 break;
2565                         if (cur->key.op == OP_ASSIGN_FINAL)
2566                                 event->devlink_final = true;
2567                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2568                                 udev_device_cleanup_devlinks_list(event->dev);
2569
2570                         /* allow  multiple symlinks separated by spaces */
2571                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2572                         if (esc == ESCAPE_UNSET)
2573                                 count = util_replace_chars(temp, "/ ");
2574                         else if (esc == ESCAPE_REPLACE)
2575                                 count = util_replace_chars(temp, "/");
2576                         if (count > 0)
2577                                 log_debug("%i character(s) replaced\n" , count);
2578                         pos = temp;
2579                         while (isspace(pos[0]))
2580                                 pos++;
2581                         next = strchr(pos, ' ');
2582                         while (next != NULL) {
2583                                 next[0] = '\0';
2584                                 log_debug("LINK '%s' %s:%u\n", pos,
2585                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2586                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2587                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2588                                 while (isspace(next[1]))
2589                                         next++;
2590                                 pos = &next[1];
2591                                 next = strchr(pos, ' ');
2592                         }
2593                         if (pos[0] != '\0') {
2594                                 log_debug("LINK '%s' %s:%u\n", pos,
2595                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2596                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2597                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2598                         }
2599                         break;
2600                 }
2601                 case TK_A_ATTR: {
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                         log_debug("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                                         log_error("error writing ATTR{%s}: %m\n", attr);
2619                                 fclose(f);
2620                         } else {
2621                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2622                         }
2623                         break;
2624                 }
2625                 case TK_A_RUN_BUILTIN:
2626                 case TK_A_RUN_PROGRAM: {
2627                         struct udev_list_entry *entry;
2628
2629                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2630                                 udev_list_cleanup(&event->run_list);
2631                         log_debug("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                         entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2636                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2637                         break;
2638                 }
2639                 case TK_A_GOTO:
2640                         if (cur->key.rule_goto == 0)
2641                                 break;
2642                         cur = &rules->tokens[cur->key.rule_goto];
2643                         continue;
2644                 case TK_END:
2645                         return 0;
2646
2647                 case TK_M_PARENTS_MIN:
2648                 case TK_M_PARENTS_MAX:
2649                 case TK_M_MAX:
2650                 case TK_UNSET:
2651                         log_error("wrong type %u\n", cur->type);
2652                         goto nomatch;
2653                 }
2654
2655                 cur++;
2656                 continue;
2657         nomatch:
2658                 /* fast-forward to next rule */
2659                 cur = rule + rule->rule.token_count;
2660         }
2661 }
2662
2663 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2664 {
2665         struct token *cur;
2666         struct token *rule;
2667         uid_t uid = 0;
2668         gid_t gid = 0;
2669         mode_t mode = 0;
2670
2671         if (rules->tokens == NULL)
2672                 return;
2673
2674         cur = &rules->tokens[0];
2675         rule = cur;
2676         for (;;) {
2677                 switch (cur->type) {
2678                 case TK_RULE:
2679                         /* current rule */
2680                         rule = cur;
2681
2682                         /* skip rules without a static_node tag */
2683                         if (!rule->rule.has_static_node)
2684                                 goto next;
2685
2686                         uid = 0;
2687                         gid = 0;
2688                         mode = 0;
2689                         break;
2690                 case TK_A_OWNER_ID:
2691                         uid = cur->key.uid;
2692                         break;
2693                 case TK_A_GROUP_ID:
2694                         gid = cur->key.gid;
2695                         break;
2696                 case TK_A_MODE_ID:
2697                         mode = cur->key.mode;
2698                         break;
2699                 case TK_A_STATIC_NODE: {
2700                         char filename[UTIL_PATH_SIZE];
2701                         struct stat stats;
2702
2703                         /* we assure, that the permissions tokens are sorted before the static token */
2704                         if (mode == 0 && uid == 0 && gid == 0)
2705                                 goto next;
2706                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2707                                       &rules->buf[cur->key.value_off], NULL);
2708                         if (stat(filename, &stats) != 0)
2709                                 goto next;
2710                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2711                                 goto next;
2712                         if (mode == 0) {
2713                                 if (gid > 0)
2714                                         mode = 0660;
2715                                 else
2716                                         mode = 0600;
2717                         }
2718                         if (mode != (stats.st_mode & 01777)) {
2719                                 chmod(filename, mode);
2720                                 log_debug("chmod '%s' %#o\n", filename, mode);
2721                         }
2722
2723                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2724                                 chown(filename, uid, gid);
2725                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2726                         }
2727
2728                         utimensat(AT_FDCWD, filename, NULL, 0);
2729                         break;
2730                 }
2731                 case TK_END:
2732                         return;
2733                 }
2734
2735                 cur++;
2736                 continue;
2737 next:
2738                 /* fast-forward to next rule */
2739                 cur = rule + rule->rule.token_count;
2740                 continue;
2741         }
2742 }