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         char **dirs;
  62         unsigned long long *dirs_ts_usec;
  63         int resolve_names;
  64
  65         /* every key in the rules file becomes a token */
  66         struct token *tokens;
  67         unsigned int token_cur;
  68         unsigned int token_max;
  69
  70         /* all key strings are copied to a single string buffer */
  71         char *buf;
  72         size_t buf_cur;
  73         size_t buf_max;
  74         unsigned int buf_count;
  75
  76         /* during rule parsing, strings are indexed and de-duplicated */
  77         struct trie_node *trie_nodes;
  78         unsigned int trie_nodes_cur;
  79         unsigned int trie_nodes_max;
  80
  81         /* during rule parsing, uid/gid lookup results are cached */
  82         struct uid_gid *uids;
  83         unsigned int uids_cur;
  84         unsigned int uids_max;
  85         struct uid_gid *gids;
  86         unsigned int gids_cur;
  87         unsigned int gids_max;
  88 };
  89
  90 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  91 enum operation_type {
  92         OP_UNSET,
  93
  94         OP_MATCH,
  95         OP_NOMATCH,
  96         OP_MATCH_MAX,
  97
  98         OP_ADD,
  99         OP_ASSIGN,
 100         OP_ASSIGN_FINAL,
 101 };
 102
 103 enum string_glob_type {
 104         GL_UNSET,
 105         GL_PLAIN,                       /* no special chars */
 106         GL_GLOB,                        /* shell globs ?,*,[] */
 107         GL_SPLIT,                       /* multi-value A|B */
 108         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 109         GL_SOMETHING,                   /* commonly used "?*" */
 110 };
 111
 112 enum string_subst_type {
 113         SB_UNSET,
 114         SB_NONE,
 115         SB_FORMAT,
 116         SB_SUBSYS,
 117 };
 118
 119 /* tokens of a rule are sorted/handled in this order */
 120 enum token_type {
 121         TK_UNSET,
 122         TK_RULE,
 123
 124         TK_M_ACTION,                    /* val */
 125         TK_M_DEVPATH,                   /* val */
 126         TK_M_KERNEL,                    /* val */
 127         TK_M_DEVLINK,                   /* val */
 128         TK_M_NAME,                      /* val */
 129         TK_M_ENV,                       /* val, attr */
 130         TK_M_TAG,                       /* val */
 131         TK_M_SUBSYSTEM,                 /* val */
 132         TK_M_DRIVER,                    /* val */
 133         TK_M_WAITFOR,                   /* val */
 134         TK_M_ATTR,                      /* val, attr */
 135
 136         TK_M_PARENTS_MIN,
 137         TK_M_KERNELS,                   /* val */
 138         TK_M_SUBSYSTEMS,                /* val */
 139         TK_M_DRIVERS,                   /* val */
 140         TK_M_ATTRS,                     /* val, attr */
 141         TK_M_TAGS,                      /* val */
 142         TK_M_PARENTS_MAX,
 143
 144         TK_M_TEST,                      /* val, mode_t */
 145         TK_M_EVENT_TIMEOUT,             /* int */
 146         TK_M_PROGRAM,                   /* val */
 147         TK_M_IMPORT_FILE,               /* val */
 148         TK_M_IMPORT_PROG,               /* val */
 149         TK_M_IMPORT_BUILTIN,            /* val */
 150         TK_M_IMPORT_DB,                 /* val */
 151         TK_M_IMPORT_CMDLINE,            /* val */
 152         TK_M_IMPORT_PARENT,             /* val */
 153         TK_M_RESULT,                    /* val */
 154         TK_M_MAX,
 155
 156         TK_A_STRING_ESCAPE_NONE,
 157         TK_A_STRING_ESCAPE_REPLACE,
 158         TK_A_DB_PERSIST,
 159         TK_A_INOTIFY_WATCH,             /* int */
 160         TK_A_DEVLINK_PRIO,              /* int */
 161         TK_A_OWNER,                     /* val */
 162         TK_A_GROUP,                     /* val */
 163         TK_A_MODE,                      /* val */
 164         TK_A_OWNER_ID,                  /* uid_t */
 165         TK_A_GROUP_ID,                  /* gid_t */
 166         TK_A_MODE_ID,                   /* mode_t */
 167         TK_A_STATIC_NODE,               /* val */
 168         TK_A_ENV,                       /* val, attr */
 169         TK_A_TAG,                       /* val */
 170         TK_A_NAME,                      /* val */
 171         TK_A_DEVLINK,                   /* val */
 172         TK_A_ATTR,                      /* val, attr */
 173         TK_A_RUN_BUILTIN,               /* val, bool */
 174         TK_A_RUN_PROGRAM,               /* val, bool */
 175         TK_A_GOTO,                      /* size_t */
 176
 177         TK_END,
 178 };
 179
 180 /* we try to pack stuff in a way that we take only 12 bytes per token */
 181 struct token {
 182         union {
 183                 unsigned char type;                /* same in rule and key */
 184                 struct {
 185                         enum token_type type:8;
 186                         bool can_set_name:1;
 187                         bool has_static_node:1;
 188                         unsigned int unused:6;
 189                         unsigned short token_count;
 190                         unsigned int label_off;
 191                         unsigned short filename_off;
 192                         unsigned short filename_line;
 193                 } rule;
 194                 struct {
 195                         enum token_type type:8;
 196                         enum operation_type op:8;
 197                         enum string_glob_type glob:8;
 198                         enum string_subst_type subst:4;
 199                         enum string_subst_type attrsubst:4;
 200                         unsigned int value_off;
 201                         union {
 202                                 unsigned int attr_off;
 203                                 int devlink_unique;
 204                                 unsigned int rule_goto;
 205                                 mode_t  mode;
 206                                 uid_t uid;
 207                                 gid_t gid;
 208                                 int devlink_prio;
 209                                 int event_timeout;
 210                                 int watch;
 211                                 enum udev_builtin_cmd builtin_cmd;
 212                         };
 213                 } key;
 214         };
 215 };
 216
 217 #define MAX_TK                64
 218 struct rule_tmp {
 219         struct udev_rules *rules;
 220         struct token rule;
 221         struct token token[MAX_TK];
 222         unsigned int token_cur;
 223 };
 224
 225 #ifdef DEBUG
 226 static const char *operation_str(enum operation_type type)
 227 {
 228         static const char *operation_strs[] = {
 229                 [OP_UNSET] =            "UNSET",
 230                 [OP_MATCH] =            "match",
 231                 [OP_NOMATCH] =          "nomatch",
 232                 [OP_MATCH_MAX] =        "MATCH_MAX",
 233
 234                 [OP_ADD] =              "add",
 235                 [OP_ASSIGN] =           "assign",
 236                 [OP_ASSIGN_FINAL] =     "assign-final",
 237 }        ;
 238
 239         return operation_strs[type];
 240 }
 241
 242 static const char *string_glob_str(enum string_glob_type type)
 243 {
 244         static const char *string_glob_strs[] = {
 245                 [GL_UNSET] =            "UNSET",
 246                 [GL_PLAIN] =            "plain",
 247                 [GL_GLOB] =             "glob",
 248                 [GL_SPLIT] =            "split",
 249                 [GL_SPLIT_GLOB] =       "split-glob",
 250                 [GL_SOMETHING] =        "split-glob",
 251         };
 252
 253         return string_glob_strs[type];
 254 }
 255
 256 static const char *token_str(enum token_type type)
 257 {
 258         static const char *token_strs[] = {
 259                 [TK_UNSET] =                    "UNSET",
 260                 [TK_RULE] =                     "RULE",
 261
 262                 [TK_M_ACTION] =                 "M ACTION",
 263                 [TK_M_DEVPATH] =                "M DEVPATH",
 264                 [TK_M_KERNEL] =                 "M KERNEL",
 265                 [TK_M_DEVLINK] =                "M DEVLINK",
 266                 [TK_M_NAME] =                   "M NAME",
 267                 [TK_M_ENV] =                    "M ENV",
 268                 [TK_M_TAG] =                    "M TAG",
 269                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 270                 [TK_M_DRIVER] =                 "M DRIVER",
 271                 [TK_M_WAITFOR] =                "M WAITFOR",
 272                 [TK_M_ATTR] =                   "M ATTR",
 273
 274                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 275                 [TK_M_KERNELS] =                "M KERNELS",
 276                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 277                 [TK_M_DRIVERS] =                "M DRIVERS",
 278                 [TK_M_ATTRS] =                  "M ATTRS",
 279                 [TK_M_TAGS] =                   "M TAGS",
 280                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 281
 282                 [TK_M_TEST] =                   "M TEST",
 283                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 284                 [TK_M_PROGRAM] =                "M PROGRAM",
 285                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 286                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 287                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 288                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 289                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 290                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 291                 [TK_M_RESULT] =                 "M RESULT",
 292                 [TK_M_MAX] =                    "M MAX",
 293
 294                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 295                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 296                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 297                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 298                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 299                 [TK_A_OWNER] =                  "A OWNER",
 300                 [TK_A_GROUP] =                  "A GROUP",
 301                 [TK_A_MODE] =                   "A MODE",
 302                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 303                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 304                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 305                 [TK_A_MODE_ID] =                "A MODE_ID",
 306                 [TK_A_ENV] =                    "A ENV",
 307                 [TK_A_TAG] =                    "A ENV",
 308                 [TK_A_NAME] =                   "A NAME",
 309                 [TK_A_DEVLINK] =                "A DEVLINK",
 310                 [TK_A_ATTR] =                   "A ATTR",
 311                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 312                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 313                 [TK_A_GOTO] =                   "A GOTO",
 314
 315                 [TK_END] =                      "END",
 316         };
 317
 318         return token_strs[type];
 319 }
 320
 321 static void dump_token(struct udev_rules *rules, struct token *token)
 322 {
 323         enum token_type type = token->type;
 324         enum operation_type op = token->key.op;
 325         enum string_glob_type glob = token->key.glob;
 326         const char *value = &rules->buf[token->key.value_off];
 327         const char *attr = &rules->buf[token->key.attr_off];
 328
 329         switch (type) {
 330         case TK_RULE:
 331                 {
 332                         const char *tks_ptr = (char *)rules->tokens;
 333                         const char *tk_ptr = (char *)token;
 334                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 335
 336                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 337                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 338                                   idx, token->rule.token_count,
 339                                   &rules->buf[token->rule.label_off]);
 340                         break;
 341                 }
 342         case TK_M_ACTION:
 343         case TK_M_DEVPATH:
 344         case TK_M_KERNEL:
 345         case TK_M_SUBSYSTEM:
 346         case TK_M_DRIVER:
 347         case TK_M_WAITFOR:
 348         case TK_M_DEVLINK:
 349         case TK_M_NAME:
 350         case TK_M_KERNELS:
 351         case TK_M_SUBSYSTEMS:
 352         case TK_M_DRIVERS:
 353         case TK_M_TAGS:
 354         case TK_M_PROGRAM:
 355         case TK_M_IMPORT_FILE:
 356         case TK_M_IMPORT_PROG:
 357         case TK_M_IMPORT_DB:
 358         case TK_M_IMPORT_CMDLINE:
 359         case TK_M_IMPORT_PARENT:
 360         case TK_M_RESULT:
 361         case TK_A_NAME:
 362         case TK_A_DEVLINK:
 363         case TK_A_OWNER:
 364         case TK_A_GROUP:
 365         case TK_A_MODE:
 366         case TK_A_RUN_BUILTIN:
 367         case TK_A_RUN_PROGRAM:
 368                 log_debug("%s %s '%s'(%s)\n",
 369                           token_str(type), operation_str(op), value, string_glob_str(glob));
 370                 break;
 371         case TK_M_IMPORT_BUILTIN:
 372                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 373                 break;
 374         case TK_M_ATTR:
 375         case TK_M_ATTRS:
 376         case TK_M_ENV:
 377         case TK_A_ATTR:
 378         case TK_A_ENV:
 379                 log_debug("%s %s '%s' '%s'(%s)\n",
 380                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 381                 break;
 382         case TK_M_TAG:
 383         case TK_A_TAG:
 384                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 385                 break;
 386         case TK_A_STRING_ESCAPE_NONE:
 387         case TK_A_STRING_ESCAPE_REPLACE:
 388         case TK_A_DB_PERSIST:
 389                 log_debug("%s\n", token_str(type));
 390                 break;
 391         case TK_M_TEST:
 392                 log_debug("%s %s '%s'(%s) %#o\n",
 393                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 394                 break;
 395         case TK_A_INOTIFY_WATCH:
 396                 log_debug("%s %u\n", token_str(type), token->key.watch);
 397                 break;
 398         case TK_A_DEVLINK_PRIO:
 399                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 400                 break;
 401         case TK_A_OWNER_ID:
 402                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 403                 break;
 404         case TK_A_GROUP_ID:
 405                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 406                 break;
 407         case TK_A_MODE_ID:
 408                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 409                 break;
 410         case TK_A_STATIC_NODE:
 411                 log_debug("%s '%s'\n", token_str(type), value);
 412                 break;
 413         case TK_M_EVENT_TIMEOUT:
 414                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 415                 break;
 416         case TK_A_GOTO:
 417                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 418                 break;
 419         case TK_END:
 420                 log_debug("* %s\n", token_str(type));
 421                 break;
 422         case TK_M_PARENTS_MIN:
 423         case TK_M_PARENTS_MAX:
 424         case TK_M_MAX:
 425         case TK_UNSET:
 426                 log_debug("unknown type %u\n", type);
 427                 break;
 428         }
 429 }
 430
 431 static void dump_rules(struct udev_rules *rules)
 432 {
 433         unsigned int i;
 434
 435         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 436                   rules->token_cur,
 437                   rules->token_cur * sizeof(struct token),
 438                   rules->buf_count,
 439                   rules->buf_cur);
 440         for(i = 0; i < rules->token_cur; i++)
 441                 dump_token(rules, &rules->tokens[i]);
 442 }
 443 #else
 444 static inline const char *operation_str(enum operation_type type) { return NULL; }
 445 static inline const char *token_str(enum token_type type) { return NULL; }
 446 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 447 static inline void dump_rules(struct udev_rules *rules) {}
 448 #endif /* DEBUG */
 449
 450 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 451 {
 452         int off;
 453
 454         /* grow buffer if needed */
 455         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 456                 char *buf;
 457                 unsigned int add;
 458
 459                 /* double the buffer size */
 460                 add = rules->buf_max;
 461                 if (add < bytes * 8)
 462                         add = bytes * 8;
 463
 464                 buf = realloc(rules->buf, rules->buf_max + add);
 465                 if (buf == NULL)
 466                         return -1;
 467                 rules->buf = buf;
 468                 rules->buf_max += add;
 469         }
 470         off = rules->buf_cur;
 471         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 472         rules->buf_cur += bytes;
 473         rules->buf_count++;
 474         return off;
 475 }
 476
 477 static int add_string(struct udev_rules *rules, const char *str)
 478 {
 479         unsigned int node_idx;
 480         struct trie_node *new_node;
 481         unsigned int new_node_idx;
 482         unsigned char key;
 483         unsigned short len;
 484         unsigned int depth;
 485         unsigned int off;
 486         struct trie_node *parent;
 487
 488         /* walk trie, start from last character of str to find matching tails */
 489         len = strlen(str);
 490         key = str[len-1];
 491         node_idx = 0;
 492         for (depth = 0; depth <= len; depth++) {
 493                 struct trie_node *node;
 494                 unsigned int child_idx;
 495
 496                 node = &rules->trie_nodes[node_idx];
 497                 off = node->value_off + node->value_len - len;
 498
 499                 /* match against current node */
 500                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 501                         return off;
 502
 503                 /* lookup child node */
 504                 key = str[len - 1 - depth];
 505                 child_idx = node->child_idx;
 506                 while (child_idx > 0) {
 507                         struct trie_node *child;
 508
 509                         child = &rules->trie_nodes[child_idx];
 510                         if (child->key == key)
 511                                 break;
 512                         child_idx = child->next_child_idx;
 513                 }
 514                 if (child_idx == 0)
 515                         break;
 516                 node_idx = child_idx;
 517         }
 518
 519         /* string not found, add it */
 520         off = add_new_string(rules, str, len + 1);
 521
 522         /* grow trie nodes if needed */
 523         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 524                 struct trie_node *nodes;
 525                 unsigned int add;
 526
 527                 /* double the buffer size */
 528                 add = rules->trie_nodes_max;
 529                 if (add < 8)
 530                         add = 8;
 531
 532                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 533                 if (nodes == NULL)
 534                         return -1;
 535                 rules->trie_nodes = nodes;
 536                 rules->trie_nodes_max += add;
 537         }
 538
 539         /* get a new node */
 540         new_node_idx = rules->trie_nodes_cur;
 541         rules->trie_nodes_cur++;
 542         new_node = &rules->trie_nodes[new_node_idx];
 543         memset(new_node, 0x00, sizeof(struct trie_node));
 544         new_node->value_off = off;
 545         new_node->value_len = len;
 546         new_node->key = key;
 547
 548         /* join the parent's child list */
 549         parent = &rules->trie_nodes[node_idx];
 550         if (parent->child_idx == 0) {
 551                 parent->child_idx = new_node_idx;
 552         } else {
 553                 struct trie_node *last_child;
 554
 555                 last_child = &rules->trie_nodes[parent->last_child_idx];
 556                 last_child->next_child_idx = new_node_idx;
 557         }
 558         parent->last_child_idx = new_node_idx;
 559         return off;
 560 }
 561
 562 static int add_token(struct udev_rules *rules, struct token *token)
 563 {
 564         /* grow buffer if needed */
 565         if (rules->token_cur+1 >= rules->token_max) {
 566                 struct token *tokens;
 567                 unsigned int add;
 568
 569                 /* double the buffer size */
 570                 add = rules->token_max;
 571                 if (add < 8)
 572                         add = 8;
 573
 574                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 575                 if (tokens == NULL)
 576                         return -1;
 577                 rules->tokens = tokens;
 578                 rules->token_max += add;
 579         }
 580         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 581         rules->token_cur++;
 582         return 0;
 583 }
 584
 585 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 586 {
 587         unsigned int i;
 588         uid_t uid;
 589         unsigned int off;
 590
 591         /* lookup, if we know it already */
 592         for (i = 0; i < rules->uids_cur; i++) {
 593                 off = rules->uids[i].name_off;
 594                 if (streq(&rules->buf[off], owner)) {
 595                         uid = rules->uids[i].uid;
 596                         return uid;
 597                 }
 598         }
 599         uid = util_lookup_user(rules->udev, owner);
 600
 601         /* grow buffer if needed */
 602         if (rules->uids_cur+1 >= rules->uids_max) {
 603                 struct uid_gid *uids;
 604                 unsigned int add;
 605
 606                 /* double the buffer size */
 607                 add = rules->uids_max;
 608                 if (add < 1)
 609                         add = 8;
 610
 611                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 612                 if (uids == NULL)
 613                         return uid;
 614                 rules->uids = uids;
 615                 rules->uids_max += add;
 616         }
 617         rules->uids[rules->uids_cur].uid = uid;
 618         off = add_string(rules, owner);
 619         if (off <= 0)
 620                 return uid;
 621         rules->uids[rules->uids_cur].name_off = off;
 622         rules->uids_cur++;
 623         return uid;
 624 }
 625
 626 static gid_t add_gid(struct udev_rules *rules, const char *group)
 627 {
 628         unsigned int i;
 629         gid_t gid;
 630         unsigned int off;
 631
 632         /* lookup, if we know it already */
 633         for (i = 0; i < rules->gids_cur; i++) {
 634                 off = rules->gids[i].name_off;
 635                 if (streq(&rules->buf[off], group)) {
 636                         gid = rules->gids[i].gid;
 637                         return gid;
 638                 }
 639         }
 640         gid = util_lookup_group(rules->udev, group);
 641
 642         /* grow buffer if needed */
 643         if (rules->gids_cur+1 >= rules->gids_max) {
 644                 struct uid_gid *gids;
 645                 unsigned int add;
 646
 647                 /* double the buffer size */
 648                 add = rules->gids_max;
 649                 if (add < 1)
 650                         add = 8;
 651
 652                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 653                 if (gids == NULL)
 654                         return gid;
 655                 rules->gids = gids;
 656                 rules->gids_max += add;
 657         }
 658         rules->gids[rules->gids_cur].gid = gid;
 659         off = add_string(rules, group);
 660         if (off <= 0)
 661                 return gid;
 662         rules->gids[rules->gids_cur].name_off = off;
 663         rules->gids_cur++;
 664         return gid;
 665 }
 666
 667 static int import_property_from_string(struct udev_device *dev, char *line)
 668 {
 669         char *key;
 670         char *val;
 671         size_t len;
 672
 673         /* find key */
 674         key = line;
 675         while (isspace(key[0]))
 676                 key++;
 677
 678         /* comment or empty line */
 679         if (key[0] == '#' || key[0] == '\0')
 680                 return -1;
 681
 682         /* split key/value */
 683         val = strchr(key, '=');
 684         if (val == NULL)
 685                 return -1;
 686         val[0] = '\0';
 687         val++;
 688
 689         /* find value */
 690         while (isspace(val[0]))
 691                 val++;
 692
 693         /* terminate key */
 694         len = strlen(key);
 695         if (len == 0)
 696                 return -1;
 697         while (isspace(key[len-1]))
 698                 len--;
 699         key[len] = '\0';
 700
 701         /* terminate value */
 702         len = strlen(val);
 703         if (len == 0)
 704                 return -1;
 705         while (isspace(val[len-1]))
 706                 len--;
 707         val[len] = '\0';
 708
 709         if (len == 0)
 710                 return -1;
 711
 712         /* unquote */
 713         if (val[0] == '"' || val[0] == '\'') {
 714                 if (val[len-1] != val[0]) {
 715                         log_debug("inconsistent quoting: '%s', skip\n", line);
 716                         return -1;
 717                 }
 718                 val[len-1] = '\0';
 719                 val++;
 720         }
 721
 722         /* handle device, renamed by external tool, returning new path */
 723         if (streq(key, "DEVPATH")) {
 724                 char syspath[UTIL_PATH_SIZE];
 725
 726                 log_debug("updating devpath from '%s' to '%s'\n",
 727                           udev_device_get_devpath(dev), val);
 728                 util_strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
 729                 udev_device_set_syspath(dev, syspath);
 730         } else {
 731                 struct udev_list_entry *entry;
 732
 733                 entry = udev_device_add_property(dev, key, val);
 734                 /* store in db, skip private keys */
 735                 if (key[0] != '.')
 736                         udev_list_entry_set_num(entry, true);
 737         }
 738         return 0;
 739 }
 740
 741 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 742 {
 743         FILE *f;
 744         char line[UTIL_LINE_SIZE];
 745
 746         f = fopen(filename, "r");
 747         if (f == NULL)
 748                 return -1;
 749         while (fgets(line, sizeof(line), f) != NULL)
 750                 import_property_from_string(dev, line);
 751         fclose(f);
 752         return 0;
 753 }
 754
 755 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 756 {
 757         struct udev_device *dev = event->dev;
 758         char **envp;
 759         char result[UTIL_LINE_SIZE];
 760         char *line;
 761         int err;
 762
 763         envp = udev_device_get_properties_envp(dev);
 764         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 765         if (err < 0)
 766                 return err;
 767
 768         line = result;
 769         while (line != NULL) {
 770                 char *pos;
 771
 772                 pos = strchr(line, '\n');
 773                 if (pos != NULL) {
 774                         pos[0] = '\0';
 775                         pos = &pos[1];
 776                 }
 777                 import_property_from_string(dev, line);
 778                 line = pos;
 779         }
 780         return 0;
 781 }
 782
 783 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 784 {
 785         struct udev_device *dev_parent;
 786         struct udev_list_entry *list_entry;
 787
 788         dev_parent = udev_device_get_parent(dev);
 789         if (dev_parent == NULL)
 790                 return -1;
 791
 792         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 793                 const char *key = udev_list_entry_get_name(list_entry);
 794                 const char *val = udev_list_entry_get_value(list_entry);
 795
 796                 if (fnmatch(filter, key, 0) == 0) {
 797                         struct udev_list_entry *entry;
 798
 799                         entry = udev_device_add_property(dev, key, val);
 800                         /* store in db, skip private keys */
 801                         if (key[0] != '.')
 802                                 udev_list_entry_set_num(entry, true);
 803                 }
 804         }
 805         return 0;
 806 }
 807
 808 #define WAIT_LOOP_PER_SECOND                50
 809 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 810 {
 811         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), udev_device_get_syspath(dev), NULL);
 820                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 821                 file = filepath;
 822         }
 823
 824         while (--loop) {
 825                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 826
 827                 /* lookup file */
 828                 if (stat(file, &stats) == 0) {
 829                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 830                         return 0;
 831                 }
 832                 /* make sure, the device did not disappear in the meantime */
 833                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 834                         log_debug("device disappeared while waiting for '%s'\n", file);
 835                         return -2;
 836                 }
 837                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 838                 nanosleep(&duration, NULL);
 839         }
 840         log_debug("waiting for '%s' failed\n", file);
 841         return -1;
 842 }
 843
 844 static int attr_subst_subdir(char *attr, size_t len)
 845 {
 846         bool found = false;
 847
 848         if (strstr(attr, "/*/")) {
 849                 char *pos;
 850                 char dirname[UTIL_PATH_SIZE];
 851                 const char *tail;
 852                 DIR *dir;
 853
 854                 util_strscpy(dirname, sizeof(dirname), attr);
 855                 pos = strstr(dirname, "/*/");
 856                 if (pos == NULL)
 857                         return -1;
 858                 pos[0] = '\0';
 859                 tail = &pos[2];
 860                 dir = opendir(dirname);
 861                 if (dir != NULL) {
 862                         struct dirent *dent;
 863
 864                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 865                                 struct stat stats;
 866
 867                                 if (dent->d_name[0] == '.')
 868                                         continue;
 869                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 870                                 if (stat(attr, &stats) == 0) {
 871                                         found = true;
 872                                         break;
 873                                 }
 874                         }
 875                         closedir(dir);
 876                 }
 877         }
 878
 879         return found;
 880 }
 881
 882 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 883 {
 884         char *linepos;
 885         char *temp;
 886
 887         linepos = *line;
 888         if (linepos == NULL || linepos[0] == '\0')
 889                 return -1;
 890
 891         /* skip whitespace */
 892         while (isspace(linepos[0]) || linepos[0] == ',')
 893                 linepos++;
 894
 895         /* get the key */
 896         if (linepos[0] == '\0')
 897                 return -1;
 898         *key = linepos;
 899
 900         for (;;) {
 901                 linepos++;
 902                 if (linepos[0] == '\0')
 903                         return -1;
 904                 if (isspace(linepos[0]))
 905                         break;
 906                 if (linepos[0] == '=')
 907                         break;
 908                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 909                         if (linepos[1] == '=')
 910                                 break;
 911         }
 912
 913         /* remember end of key */
 914         temp = linepos;
 915
 916         /* skip whitespace after key */
 917         while (isspace(linepos[0]))
 918                 linepos++;
 919         if (linepos[0] == '\0')
 920                 return -1;
 921
 922         /* get operation type */
 923         if (linepos[0] == '=' && linepos[1] == '=') {
 924                 *op = OP_MATCH;
 925                 linepos += 2;
 926         } else if (linepos[0] == '!' && linepos[1] == '=') {
 927                 *op = OP_NOMATCH;
 928                 linepos += 2;
 929         } else if (linepos[0] == '+' && linepos[1] == '=') {
 930                 *op = OP_ADD;
 931                 linepos += 2;
 932         } else if (linepos[0] == '=') {
 933                 *op = OP_ASSIGN;
 934                 linepos++;
 935         } else if (linepos[0] == ':' && linepos[1] == '=') {
 936                 *op = OP_ASSIGN_FINAL;
 937                 linepos += 2;
 938         } else
 939                 return -1;
 940
 941         /* terminate key */
 942         temp[0] = '\0';
 943
 944         /* skip whitespace after operator */
 945         while (isspace(linepos[0]))
 946                 linepos++;
 947         if (linepos[0] == '\0')
 948                 return -1;
 949
 950         /* get the value */
 951         if (linepos[0] == '"')
 952                 linepos++;
 953         else
 954                 return -1;
 955         *value = linepos;
 956
 957         /* terminate */
 958         temp = strchr(linepos, '"');
 959         if (!temp)
 960                 return -1;
 961         temp[0] = '\0';
 962         temp++;
 963
 964         /* move line to next key */
 965         *line = temp;
 966         return 0;
 967 }
 968
 969 /* extract possible KEY{attr} */
 970 static const char *get_key_attribute(struct udev *udev, char *str)
 971 {
 972         char *pos;
 973         char *attr;
 974
 975         attr = strchr(str, '{');
 976         if (attr != NULL) {
 977                 attr++;
 978                 pos = strchr(attr, '}');
 979                 if (pos == NULL) {
 980                         log_error("missing closing brace for format\n");
 981                         return NULL;
 982                 }
 983                 pos[0] = '\0';
 984                 return attr;
 985         }
 986         return NULL;
 987 }
 988
 989 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 990                         enum operation_type op,
 991                         const char *value, const void *data)
 992 {
 993         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 994         const char *attr = NULL;
 995
 996         memset(token, 0x00, sizeof(struct token));
 997
 998         switch (type) {
 999         case TK_M_ACTION:
1000         case TK_M_DEVPATH:
1001         case TK_M_KERNEL:
1002         case TK_M_SUBSYSTEM:
1003         case TK_M_DRIVER:
1004         case TK_M_WAITFOR:
1005         case TK_M_DEVLINK:
1006         case TK_M_NAME:
1007         case TK_M_KERNELS:
1008         case TK_M_SUBSYSTEMS:
1009         case TK_M_DRIVERS:
1010         case TK_M_TAGS:
1011         case TK_M_PROGRAM:
1012         case TK_M_IMPORT_FILE:
1013         case TK_M_IMPORT_PROG:
1014         case TK_M_IMPORT_DB:
1015         case TK_M_IMPORT_CMDLINE:
1016         case TK_M_IMPORT_PARENT:
1017         case TK_M_RESULT:
1018         case TK_A_OWNER:
1019         case TK_A_GROUP:
1020         case TK_A_MODE:
1021         case TK_A_NAME:
1022         case TK_A_GOTO:
1023         case TK_M_TAG:
1024         case TK_A_TAG:
1025                 token->key.value_off = add_string(rule_tmp->rules, value);
1026                 break;
1027         case TK_M_IMPORT_BUILTIN:
1028                 token->key.value_off = add_string(rule_tmp->rules, value);
1029                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1030                 break;
1031         case TK_M_ENV:
1032         case TK_M_ATTR:
1033         case TK_M_ATTRS:
1034         case TK_A_ATTR:
1035         case TK_A_ENV:
1036                 attr = data;
1037                 token->key.value_off = add_string(rule_tmp->rules, value);
1038                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1039                 break;
1040         case TK_A_DEVLINK:
1041                 token->key.value_off = add_string(rule_tmp->rules, value);
1042                 token->key.devlink_unique = *(int *)data;
1043                 break;
1044         case TK_M_TEST:
1045                 token->key.value_off = add_string(rule_tmp->rules, value);
1046                 if (data != NULL)
1047                         token->key.mode = *(mode_t *)data;
1048                 break;
1049         case TK_A_STRING_ESCAPE_NONE:
1050         case TK_A_STRING_ESCAPE_REPLACE:
1051         case TK_A_DB_PERSIST:
1052                 break;
1053         case TK_A_RUN_BUILTIN:
1054         case TK_A_RUN_PROGRAM:
1055                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1056                 token->key.value_off = add_string(rule_tmp->rules, value);
1057                 break;
1058         case TK_A_INOTIFY_WATCH:
1059         case TK_A_DEVLINK_PRIO:
1060                 token->key.devlink_prio = *(int *)data;
1061                 break;
1062         case TK_A_OWNER_ID:
1063                 token->key.uid = *(uid_t *)data;
1064                 break;
1065         case TK_A_GROUP_ID:
1066                 token->key.gid = *(gid_t *)data;
1067                 break;
1068         case TK_A_MODE_ID:
1069                 token->key.mode = *(mode_t *)data;
1070                 break;
1071         case TK_A_STATIC_NODE:
1072                 token->key.value_off = add_string(rule_tmp->rules, value);
1073                 break;
1074         case TK_M_EVENT_TIMEOUT:
1075                 token->key.event_timeout = *(int *)data;
1076                 break;
1077         case TK_RULE:
1078         case TK_M_PARENTS_MIN:
1079         case TK_M_PARENTS_MAX:
1080         case TK_M_MAX:
1081         case TK_END:
1082         case TK_UNSET:
1083                 log_error("wrong type %u\n", type);
1084                 return -1;
1085         }
1086
1087         if (value != NULL && type < TK_M_MAX) {
1088                 /* check if we need to split or call fnmatch() while matching rules */
1089                 enum string_glob_type glob;
1090                 int has_split;
1091                 int has_glob;
1092
1093                 has_split = (strchr(value, '|') != NULL);
1094                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1095                 if (has_split && has_glob) {
1096                         glob = GL_SPLIT_GLOB;
1097                 } else if (has_split) {
1098                         glob = GL_SPLIT;
1099                 } else if (has_glob) {
1100                         if (streq(value, "?*"))
1101                                 glob = GL_SOMETHING;
1102                         else
1103                                 glob = GL_GLOB;
1104                 } else {
1105                         glob = GL_PLAIN;
1106                 }
1107                 token->key.glob = glob;
1108         }
1109
1110         if (value != NULL && type > TK_M_MAX) {
1111                 /* check if assigned value has substitution chars */
1112                 if (value[0] == '[')
1113                         token->key.subst = SB_SUBSYS;
1114                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1115                         token->key.subst = SB_FORMAT;
1116                 else
1117                         token->key.subst = SB_NONE;
1118         }
1119
1120         if (attr != NULL) {
1121                 /* check if property/attribut name has substitution chars */
1122                 if (attr[0] == '[')
1123                         token->key.attrsubst = SB_SUBSYS;
1124                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1125                         token->key.attrsubst = SB_FORMAT;
1126                 else
1127                         token->key.attrsubst = SB_NONE;
1128         }
1129
1130         token->key.type = type;
1131         token->key.op = op;
1132         rule_tmp->token_cur++;
1133         if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1134                 log_error("temporary rule array too small\n");
1135                 return -1;
1136         }
1137         return 0;
1138 }
1139
1140 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1141 {
1142         unsigned int i;
1143         unsigned int start = 0;
1144         unsigned int end = rule_tmp->token_cur;
1145
1146         for (i = 0; i < rule_tmp->token_cur; i++) {
1147                 enum token_type next_val = TK_UNSET;
1148                 unsigned int next_idx = 0;
1149                 unsigned int j;
1150
1151                 /* find smallest value */
1152                 for (j = start; j < end; j++) {
1153                         if (rule_tmp->token[j].type == TK_UNSET)
1154                                 continue;
1155                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1156                                 next_val = rule_tmp->token[j].type;
1157                                 next_idx = j;
1158                         }
1159                 }
1160
1161                 /* add token and mark done */
1162                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1163                         return -1;
1164                 rule_tmp->token[next_idx].type = TK_UNSET;
1165
1166                 /* shrink range */
1167                 if (next_idx == start)
1168                         start++;
1169                 if (next_idx+1 == end)
1170                         end--;
1171         }
1172         return 0;
1173 }
1174
1175 static int add_rule(struct udev_rules *rules, char *line,
1176                     const char *filename, unsigned int filename_off, unsigned int lineno)
1177 {
1178         char *linepos;
1179         const char *attr;
1180         struct rule_tmp rule_tmp;
1181
1182         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1183         rule_tmp.rules = rules;
1184         rule_tmp.rule.type = TK_RULE;
1185         /* the offset in the rule is limited to unsigned short */
1186         if (filename_off < USHRT_MAX)
1187                 rule_tmp.rule.rule.filename_off = filename_off;
1188         rule_tmp.rule.rule.filename_line = lineno;
1189
1190         linepos = line;
1191         for (;;) {
1192                 char *key;
1193                 char *value;
1194                 enum operation_type op;
1195
1196                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1197                         break;
1198
1199                 if (streq(key, "ACTION")) {
1200                         if (op > OP_MATCH_MAX) {
1201                                 log_error("invalid ACTION operation\n");
1202                                 goto invalid;
1203                         }
1204                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1205                         continue;
1206                 }
1207
1208                 if (streq(key, "DEVPATH")) {
1209                         if (op > OP_MATCH_MAX) {
1210                                 log_error("invalid DEVPATH operation\n");
1211                                 goto invalid;
1212                         }
1213                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1214                         continue;
1215                 }
1216
1217                 if (streq(key, "KERNEL")) {
1218                         if (op > OP_MATCH_MAX) {
1219                                 log_error("invalid KERNEL operation\n");
1220                                 goto invalid;
1221                         }
1222                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1223                         continue;
1224                 }
1225
1226                 if (streq(key, "SUBSYSTEM")) {
1227                         if (op > OP_MATCH_MAX) {
1228                                 log_error("invalid SUBSYSTEM operation\n");
1229                                 goto invalid;
1230                         }
1231                         /* bus, class, subsystem events should all be the same */
1232                         if (streq(value, "subsystem") ||
1233                             streq(value, "bus") ||
1234                             streq(value, "class")) {
1235                                 if (streq(value, "bus") || streq(value, "class"))
1236                                         log_error("'%s' must be specified as 'subsystem' \n"
1237                                             "please fix it in %s:%u", value, filename, lineno);
1238                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1239                         } else
1240                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1241                         continue;
1242                 }
1243
1244                 if (streq(key, "DRIVER")) {
1245                         if (op > OP_MATCH_MAX) {
1246                                 log_error("invalid DRIVER operation\n");
1247                                 goto invalid;
1248                         }
1249                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1250                         continue;
1251                 }
1252
1253                 if (startswith(key, "ATTR{")) {
1254                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1255                         if (attr == NULL) {
1256                                 log_error("error parsing ATTR attribute\n");
1257                                 goto invalid;
1258                         }
1259                         if (op < OP_MATCH_MAX) {
1260                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1261                         } else {
1262                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1263                         }
1264                         continue;
1265                 }
1266
1267                 if (streq(key, "KERNELS")) {
1268                         if (op > OP_MATCH_MAX) {
1269                                 log_error("invalid KERNELS operation\n");
1270                                 goto invalid;
1271                         }
1272                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1273                         continue;
1274                 }
1275
1276                 if (streq(key, "SUBSYSTEMS")) {
1277                         if (op > OP_MATCH_MAX) {
1278                                 log_error("invalid SUBSYSTEMS operation\n");
1279                                 goto invalid;
1280                         }
1281                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1282                         continue;
1283                 }
1284
1285                 if (streq(key, "DRIVERS")) {
1286                         if (op > OP_MATCH_MAX) {
1287                                 log_error("invalid DRIVERS operation\n");
1288                                 goto invalid;
1289                         }
1290                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1291                         continue;
1292                 }
1293
1294                 if (startswith(key, "ATTRS{")) {
1295                         if (op > OP_MATCH_MAX) {
1296                                 log_error("invalid ATTRS operation\n");
1297                                 goto invalid;
1298                         }
1299                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1300                         if (attr == NULL) {
1301                                 log_error("error parsing ATTRS attribute\n");
1302                                 goto invalid;
1303                         }
1304                         if (startswith(attr, "device/"))
1305                                 log_error("the 'device' link may not be available in a future kernel, "
1306                                     "please fix it in %s:%u", filename, lineno);
1307                         else if (strstr(attr, "../") != NULL)
1308                                 log_error("do not reference parent sysfs directories directly, "
1309                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1310                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1311                         continue;
1312                 }
1313
1314                 if (streq(key, "TAGS")) {
1315                         if (op > OP_MATCH_MAX) {
1316                                 log_error("invalid TAGS operation\n");
1317                                 goto invalid;
1318                         }
1319                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1320                         continue;
1321                 }
1322
1323                 if (startswith(key, "ENV{")) {
1324                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1325                         if (attr == NULL) {
1326                                 log_error("error parsing ENV attribute\n");
1327                                 goto invalid;
1328                         }
1329                         if (op < OP_MATCH_MAX) {
1330                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1331                                         goto invalid;
1332                         } else {
1333                                 static const char *blacklist[] = {
1334                                         "ACTION",
1335                                         "SUBSYSTEM",
1336                                         "DEVTYPE",
1337                                         "MAJOR",
1338                                         "MINOR",
1339                                         "DRIVER",
1340                                         "IFINDEX",
1341                                         "DEVNAME",
1342                                         "DEVLINKS",
1343                                         "DEVPATH",
1344                                         "TAGS",
1345                                 };
1346                                 unsigned int i;
1347
1348                                 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1349                                         if (!streq(attr, blacklist[i]))
1350                                                 continue;
1351                                         log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1352                                         goto invalid;
1353                                 }
1354                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1355                                         goto invalid;
1356                         }
1357                         continue;
1358                 }
1359
1360                 if (streq(key, "TAG")) {
1361                         if (op < OP_MATCH_MAX)
1362                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1363                         else
1364                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1365                         continue;
1366                 }
1367
1368                 if (streq(key, "PROGRAM")) {
1369                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1370                         continue;
1371                 }
1372
1373                 if (streq(key, "RESULT")) {
1374                         if (op > OP_MATCH_MAX) {
1375                                 log_error("invalid RESULT operation\n");
1376                                 goto invalid;
1377                         }
1378                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1379                         continue;
1380                 }
1381
1382                 if (startswith(key, "IMPORT")) {
1383                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1384                         if (attr == NULL) {
1385                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1386                                 continue;
1387                         }
1388                         if (streq(attr, "program")) {
1389                                 /* find known built-in command */
1390                                 if (value[0] != '/') {
1391                                         enum udev_builtin_cmd cmd;
1392
1393                                         cmd = udev_builtin_lookup(value);
1394                                         if (cmd < UDEV_BUILTIN_MAX) {
1395                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1396                                                           value, filename, lineno);
1397                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1398                                                 continue;
1399                                         }
1400                                 }
1401                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1402                         } else if (streq(attr, "builtin")) {
1403                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1404
1405                                 if (cmd < UDEV_BUILTIN_MAX)
1406                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1407                                 else
1408                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1409                         } else if (streq(attr, "file")) {
1410                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1411                         } else if (streq(attr, "db")) {
1412                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1413                         } else if (streq(attr, "cmdline")) {
1414                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1415                         } else if (streq(attr, "parent")) {
1416                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1417                         } else
1418                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1419                         continue;
1420                 }
1421
1422                 if (startswith(key, "TEST")) {
1423                         mode_t mode = 0;
1424
1425                         if (op > OP_MATCH_MAX) {
1426                                 log_error("invalid TEST operation\n");
1427                                 goto invalid;
1428                         }
1429                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1430                         if (attr != NULL) {
1431                                 mode = strtol(attr, NULL, 8);
1432                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1433                         } else {
1434                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1435                         }
1436                         continue;
1437                 }
1438
1439                 if (startswith(key, "RUN")) {
1440                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1441                         if (attr == NULL)
1442                                 attr = "program";
1443
1444                         if (streq(attr, "builtin")) {
1445                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1446
1447                                 if (cmd < UDEV_BUILTIN_MAX)
1448                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1449                                 else
1450                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1451                         } else if (streq(attr, "program")) {
1452                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1453
1454                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1455                         } else {
1456                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1457                         }
1458
1459                         continue;
1460                 }
1461
1462                 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1463                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1464                         continue;
1465                 }
1466
1467                 if (streq(key, "LABEL")) {
1468                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1469                         continue;
1470                 }
1471
1472                 if (streq(key, "GOTO")) {
1473                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1474                         continue;
1475                 }
1476
1477                 if (startswith(key, "NAME")) {
1478                         if (op < OP_MATCH_MAX) {
1479                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1480                         } else {
1481                                 if (streq(value, "%k")) {
1482                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1483                                             "please remove it from %s:%u\n", filename, lineno);
1484                                         continue;
1485                                 }
1486                                 if (value[0] == '\0') {
1487                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1488                                                   "please remove it from %s:%u\n", filename, lineno);
1489                                         continue;
1490                                 }
1491                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1492                         }
1493                         rule_tmp.rule.rule.can_set_name = true;
1494                         continue;
1495                 }
1496
1497                 if (startswith(key, "SYMLINK")) {
1498                         if (op < OP_MATCH_MAX) {
1499                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1500                         } else {
1501                                 int flag = 0;
1502
1503                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1504                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1505                                         flag = 1;
1506                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1507                         }
1508                         rule_tmp.rule.rule.can_set_name = true;
1509                         continue;
1510                 }
1511
1512                 if (streq(key, "OWNER")) {
1513                         uid_t uid;
1514                         char *endptr;
1515
1516                         uid = strtoul(value, &endptr, 10);
1517                         if (endptr[0] == '\0') {
1518                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1519                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1520                                 uid = add_uid(rules, value);
1521                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1522                         } else if (rules->resolve_names >= 0) {
1523                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1524                         }
1525                         rule_tmp.rule.rule.can_set_name = true;
1526                         continue;
1527                 }
1528
1529                 if (streq(key, "GROUP")) {
1530                         gid_t gid;
1531                         char *endptr;
1532
1533                         gid = strtoul(value, &endptr, 10);
1534                         if (endptr[0] == '\0') {
1535                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1536                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1537                                 gid = add_gid(rules, value);
1538                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1539                         } else if (rules->resolve_names >= 0) {
1540                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1541                         }
1542                         rule_tmp.rule.rule.can_set_name = true;
1543                         continue;
1544                 }
1545
1546                 if (streq(key, "MODE")) {
1547                         mode_t mode;
1548                         char *endptr;
1549
1550                         mode = strtol(value, &endptr, 8);
1551                         if (endptr[0] == '\0')
1552                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1553                         else
1554                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1555                         rule_tmp.rule.rule.can_set_name = true;
1556                         continue;
1557                 }
1558
1559                 if (streq(key, "OPTIONS")) {
1560                         const char *pos;
1561
1562                         pos = strstr(value, "link_priority=");
1563                         if (pos != NULL) {
1564                                 int prio = atoi(&pos[strlen("link_priority=")]);
1565
1566                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1567                         }
1568
1569                         pos = strstr(value, "event_timeout=");
1570                         if (pos != NULL) {
1571                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1572
1573                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1574                         }
1575
1576                         pos = strstr(value, "string_escape=");
1577                         if (pos != NULL) {
1578                                 pos = &pos[strlen("string_escape=")];
1579                                 if (startswith(pos, "none"))
1580                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1581                                 else if (startswith(pos, "replace"))
1582                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1583                         }
1584
1585                         pos = strstr(value, "db_persist");
1586                         if (pos != NULL)
1587                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1588
1589                         pos = strstr(value, "nowatch");
1590                         if (pos != NULL) {
1591                                 const int off = 0;
1592
1593                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1594                         } else {
1595                                 pos = strstr(value, "watch");
1596                                 if (pos != NULL) {
1597                                         const int on = 1;
1598
1599                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1600                                 }
1601                         }
1602
1603                         pos = strstr(value, "static_node=");
1604                         if (pos != NULL) {
1605                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1606                                 rule_tmp.rule.rule.has_static_node = true;
1607                         }
1608
1609                         continue;
1610                 }
1611
1612                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1613                 goto invalid;
1614         }
1615
1616         /* add rule token */
1617         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1618         if (add_token(rules, &rule_tmp.rule) != 0)
1619                 goto invalid;
1620
1621         /* add tokens to list, sorted by type */
1622         if (sort_token(rules, &rule_tmp) != 0)
1623                 goto invalid;
1624
1625         return 0;
1626 invalid:
1627         log_error("invalid rule '%s:%u'\n", filename, lineno);
1628         return -1;
1629 }
1630
1631 static int parse_file(struct udev_rules *rules, const char *filename)
1632 {
1633         FILE *f;
1634         unsigned int first_token;
1635         unsigned int filename_off;
1636         char line[UTIL_LINE_SIZE];
1637         int line_nr = 0;
1638         unsigned int i;
1639
1640         if (null_or_empty_path(filename)) {
1641                 log_debug("skip empty file: %s\n", filename);
1642                 return 0;
1643         }
1644         log_debug("read rules file: %s\n", filename);
1645
1646         f = fopen(filename, "r");
1647         if (f == NULL)
1648                 return -1;
1649
1650         first_token = rules->token_cur;
1651         filename_off = add_string(rules, filename);
1652
1653         while (fgets(line, sizeof(line), f) != NULL) {
1654                 char *key;
1655                 size_t len;
1656
1657                 /* skip whitespace */
1658                 line_nr++;
1659                 key = line;
1660                 while (isspace(key[0]))
1661                         key++;
1662
1663                 /* comment */
1664                 if (key[0] == '#')
1665                         continue;
1666
1667                 len = strlen(line);
1668                 if (len < 3)
1669                         continue;
1670
1671                 /* continue reading if backslash+newline is found */
1672                 while (line[len-2] == '\\') {
1673                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1674                                 break;
1675                         if (strlen(&line[len-2]) < 2)
1676                                 break;
1677                         line_nr++;
1678                         len = strlen(line);
1679                 }
1680
1681                 if (len+1 >= sizeof(line)) {
1682                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1683                         continue;
1684                 }
1685                 add_rule(rules, key, filename, filename_off, line_nr);
1686         }
1687         fclose(f);
1688
1689         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1690         for (i = first_token+1; i < rules->token_cur; i++) {
1691                 if (rules->tokens[i].type == TK_A_GOTO) {
1692                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1693                         unsigned int j;
1694
1695                         for (j = i+1; j < rules->token_cur; j++) {
1696                                 if (rules->tokens[j].type != TK_RULE)
1697                                         continue;
1698                                 if (rules->tokens[j].rule.label_off == 0)
1699                                         continue;
1700                                 if (!streq(label, &rules->buf[rules->tokens[j].rule.label_off]))
1701                                         continue;
1702                                 rules->tokens[i].key.rule_goto = j;
1703                                 break;
1704                         }
1705                         if (rules->tokens[i].key.rule_goto == 0)
1706                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1707                 }
1708         }
1709         return 0;
1710 }
1711
1712 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1713 {
1714         struct udev_rules *rules;
1715         struct udev_list file_list;
1716         struct token end_token;
1717         char **files, **f;
1718         int r;
1719
1720         rules = calloc(1, sizeof(struct udev_rules));
1721         if (rules == NULL)
1722                 return NULL;
1723         rules->udev = udev;
1724         rules->resolve_names = resolve_names;
1725         udev_list_init(udev, &file_list, true);
1726
1727         /* init token array and string buffer */
1728         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1729         if (rules->tokens == NULL) {
1730                 free(rules);
1731                 return NULL;
1732         }
1733         rules->token_max = PREALLOC_TOKEN;
1734
1735         rules->buf = malloc(PREALLOC_STRBUF);
1736         if (rules->buf == NULL) {
1737                 free(rules->tokens);
1738                 free(rules);
1739                 return NULL;
1740         }
1741         rules->buf_max = PREALLOC_STRBUF;
1742         /* offset 0 is always '\0' */
1743         rules->buf[0] = '\0';
1744         rules->buf_cur = 1;
1745
1746         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1747         if (rules->trie_nodes == NULL) {
1748                 free(rules->buf);
1749                 free(rules->tokens);
1750                 free(rules);
1751                 return NULL;
1752         }
1753         rules->trie_nodes_max = PREALLOC_TRIE;
1754         /* offset 0 is the trie root, with an empty string */
1755         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1756         rules->trie_nodes_cur = 1;
1757
1758         rules->dirs = strv_new(TEST_PREFIX SYSCONFDIR "/udev/rules.d",
1759                                TEST_PREFIX "/run/udev/rules.d",
1760                                TEST_PREFIX UDEVLIBEXECDIR "/rules.d",
1761                                NULL);
1762         if (!rules->dirs) {
1763                 log_error("failed to build config directory array");
1764                 return NULL;
1765         }
1766         if (!strv_path_canonicalize(rules->dirs)) {
1767                 log_error("failed to canonicalize config directories\n");
1768                 return NULL;
1769         }
1770         strv_uniq(rules->dirs);
1771         r = conf_files_list_strv(&files, ".rules", (const char **)rules->dirs);
1772         if (r < 0) {
1773                 log_error("failed to enumerate rules files: %s\n", strerror(-r));
1774                 return NULL;
1775         }
1776         rules->dirs_ts_usec = calloc(strv_length(rules->dirs), sizeof(long long));
1777
1778         /*
1779          * The offset value in the rules strct is limited; add all
1780          * rules file names to the beginning of the string buffer.
1781          */
1782         STRV_FOREACH(f, files)
1783                 add_string(rules, *f);
1784
1785         STRV_FOREACH(f, files)
1786                 parse_file(rules, *f);
1787
1788         strv_free(files);
1789
1790         memset(&end_token, 0x00, sizeof(struct token));
1791         end_token.type = TK_END;
1792         add_token(rules, &end_token);
1793
1794         /* shrink allocated token and string buffer */
1795         if (rules->token_cur < rules->token_max) {
1796                 struct token *tokens;
1797
1798                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1799                 if (tokens != NULL || rules->token_cur == 0) {
1800                         rules->tokens = tokens;
1801                         rules->token_max = rules->token_cur;
1802                 }
1803         }
1804         if (rules->buf_cur < rules->buf_max) {
1805                 char *buf;
1806
1807                 buf = realloc(rules->buf, rules->buf_cur);
1808                 if (buf != NULL || rules->buf_cur == 0) {
1809                         rules->buf = buf;
1810                         rules->buf_max = rules->buf_cur;
1811                 }
1812         }
1813         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1814                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1815         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1816                   rules->trie_nodes_cur * sizeof(struct trie_node),
1817                   rules->trie_nodes_cur, sizeof(struct trie_node));
1818
1819         /* cleanup trie */
1820         free(rules->trie_nodes);
1821         rules->trie_nodes = NULL;
1822         rules->trie_nodes_cur = 0;
1823         rules->trie_nodes_max = 0;
1824
1825         /* cleanup uid/gid cache */
1826         free(rules->uids);
1827         rules->uids = NULL;
1828         rules->uids_cur = 0;
1829         rules->uids_max = 0;
1830         free(rules->gids);
1831         rules->gids = NULL;
1832         rules->gids_cur = 0;
1833         rules->gids_max = 0;
1834
1835         dump_rules(rules);
1836         return rules;
1837 }
1838
1839 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1840 {
1841         if (rules == NULL)
1842                 return NULL;
1843         free(rules->tokens);
1844         free(rules->buf);
1845         free(rules->trie_nodes);
1846         free(rules->uids);
1847         free(rules->gids);
1848         strv_free(rules->dirs);
1849         free(rules->dirs_ts_usec);
1850         free(rules);
1851         return NULL;
1852 }
1853
1854 bool udev_rules_check_timestamp(struct udev_rules *rules)
1855 {
1856         unsigned int i;
1857         bool changed = false;
1858
1859         for (i = 0; rules->dirs[i]; i++) {
1860                 struct stat stats;
1861
1862                 if (stat(rules->dirs[i], &stats) < 0)
1863                         continue;
1864
1865                 if (rules->dirs_ts_usec[i] == ts_usec(&stats.st_mtim))
1866                         continue;
1867
1868                 /* first check */
1869                 if (rules->dirs_ts_usec[i] != 0) {
1870                         log_debug("reload - timestamp of '%s' changed\n", rules->dirs[i]);
1871                         changed = true;
1872                 }
1873
1874                 /* update timestamp */
1875                 rules->dirs_ts_usec[i] = ts_usec(&stats.st_mtim);
1876         }
1877
1878         return changed;
1879 }
1880
1881 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1882 {
1883         char *key_value = &rules->buf[token->key.value_off];
1884         char *pos;
1885         bool match = false;
1886
1887         if (val == NULL)
1888                 val = "";
1889
1890         switch (token->key.glob) {
1891         case GL_PLAIN:
1892                 match = (streq(key_value, val));
1893                 break;
1894         case GL_GLOB:
1895                 match = (fnmatch(key_value, val, 0) == 0);
1896                 break;
1897         case GL_SPLIT:
1898                 {
1899                         const char *s;
1900                         size_t len;
1901
1902                         s = &rules->buf[token->key.value_off];
1903                         len = strlen(val);
1904                         for (;;) {
1905                                 const char *next;
1906
1907                                 next = strchr(s, '|');
1908                                 if (next != NULL) {
1909                                         size_t matchlen = (size_t)(next - s);
1910
1911                                         match = (matchlen == len && strncmp(s, val, matchlen) == 0);
1912                                         if (match)
1913                                                 break;
1914                                 } else {
1915                                         match = (streq(s, val));
1916                                         break;
1917                                 }
1918                                 s = &next[1];
1919                         }
1920                         break;
1921                 }
1922         case GL_SPLIT_GLOB:
1923                 {
1924                         char value[UTIL_PATH_SIZE];
1925
1926                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1927                         key_value = value;
1928                         while (key_value != NULL) {
1929                                 pos = strchr(key_value, '|');
1930                                 if (pos != NULL) {
1931                                         pos[0] = '\0';
1932                                         pos = &pos[1];
1933                                 }
1934                                 match = (fnmatch(key_value, val, 0) == 0);
1935                                 if (match)
1936                                         break;
1937                                 key_value = pos;
1938                         }
1939                         break;
1940                 }
1941         case GL_SOMETHING:
1942                 match = (val[0] != '\0');
1943                 break;
1944         case GL_UNSET:
1945                 return -1;
1946         }
1947
1948         if (match && (token->key.op == OP_MATCH))
1949                 return 0;
1950         if (!match && (token->key.op == OP_NOMATCH))
1951                 return 0;
1952         return -1;
1953 }
1954
1955 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1956 {
1957         const char *name;
1958         char nbuf[UTIL_NAME_SIZE];
1959         const char *value;
1960         char vbuf[UTIL_NAME_SIZE];
1961         size_t len;
1962
1963         name = &rules->buf[cur->key.attr_off];
1964         switch (cur->key.attrsubst) {
1965         case SB_FORMAT:
1966                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1967                 name = nbuf;
1968                 /* fall through */
1969         case SB_NONE:
1970                 value = udev_device_get_sysattr_value(dev, name);
1971                 if (value == NULL)
1972                         return -1;
1973                 break;
1974         case SB_SUBSYS:
1975                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1976                         return -1;
1977                 value = vbuf;
1978                 break;
1979         default:
1980                 return -1;
1981         }
1982
1983         /* remove trailing whitespace, if not asked to match for it */
1984         len = strlen(value);
1985         if (len > 0 && isspace(value[len-1])) {
1986                 const char *key_value;
1987                 size_t klen;
1988
1989                 key_value = &rules->buf[cur->key.value_off];
1990                 klen = strlen(key_value);
1991                 if (klen > 0 && !isspace(key_value[klen-1])) {
1992                         if (value != vbuf) {
1993                                 util_strscpy(vbuf, sizeof(vbuf), value);
1994                                 value = vbuf;
1995                         }
1996                         while (len > 0 && isspace(vbuf[--len]))
1997                                 vbuf[len] = '\0';
1998                 }
1999         }
2000
2001         return match_key(rules, cur, value);
2002 }
2003
2004 enum escape_type {
2005         ESCAPE_UNSET,
2006         ESCAPE_NONE,
2007         ESCAPE_REPLACE,
2008 };
2009
2010 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2011 {
2012         struct token *cur;
2013         struct token *rule;
2014         enum escape_type esc = ESCAPE_UNSET;
2015         bool can_set_name;
2016
2017         if (rules->tokens == NULL)
2018                 return -1;
2019
2020         can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
2021                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2022                          udev_device_get_ifindex(event->dev) > 0));
2023
2024         /* loop through token list, match, run actions or forward to next rule */
2025         cur = &rules->tokens[0];
2026         rule = cur;
2027         for (;;) {
2028                 dump_token(rules, cur);
2029                 switch (cur->type) {
2030                 case TK_RULE:
2031                         /* current rule */
2032                         rule = cur;
2033                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2034                         if (!can_set_name && rule->rule.can_set_name)
2035                                 goto nomatch;
2036                         esc = ESCAPE_UNSET;
2037                         break;
2038                 case TK_M_ACTION:
2039                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2040                                 goto nomatch;
2041                         break;
2042                 case TK_M_DEVPATH:
2043                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2044                                 goto nomatch;
2045                         break;
2046                 case TK_M_KERNEL:
2047                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2048                                 goto nomatch;
2049                         break;
2050                 case TK_M_DEVLINK: {
2051                         struct udev_list_entry *list_entry;
2052                         bool match = false;
2053
2054                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2055                                 const char *devlink;
2056
2057                                 devlink =  udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/");
2058                                 if (match_key(rules, cur, devlink) == 0) {
2059                                         match = true;
2060                                         break;
2061                                 }
2062                         }
2063                         if (!match)
2064                                 goto nomatch;
2065                         break;
2066                 }
2067                 case TK_M_NAME:
2068                         if (match_key(rules, cur, event->name) != 0)
2069                                 goto nomatch;
2070                         break;
2071                 case TK_M_ENV: {
2072                         const char *key_name = &rules->buf[cur->key.attr_off];
2073                         const char *value;
2074
2075                         value = udev_device_get_property_value(event->dev, key_name);
2076                         if (value == NULL)
2077                                 value = "";
2078                         if (match_key(rules, cur, value))
2079                                 goto nomatch;
2080                         break;
2081                 }
2082                 case TK_M_TAG: {
2083                         struct udev_list_entry *list_entry;
2084                         bool match = false;
2085
2086                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2087                                 if (streq(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry))) {
2088                                         match = true;
2089                                         break;
2090                                 }
2091                         }
2092                         if (!match && (cur->key.op != OP_NOMATCH))
2093                                 goto nomatch;
2094                         break;
2095                 }
2096                 case TK_M_SUBSYSTEM:
2097                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2098                                 goto nomatch;
2099                         break;
2100                 case TK_M_DRIVER:
2101                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2102                                 goto nomatch;
2103                         break;
2104                 case TK_M_WAITFOR: {
2105                         char filename[UTIL_PATH_SIZE];
2106                         int found;
2107
2108                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2109                         found = (wait_for_file(event->dev, filename, 10) == 0);
2110                         if (!found && (cur->key.op != OP_NOMATCH))
2111                                 goto nomatch;
2112                         break;
2113                 }
2114                 case TK_M_ATTR:
2115                         if (match_attr(rules, event->dev, event, cur) != 0)
2116                                 goto nomatch;
2117                         break;
2118                 case TK_M_KERNELS:
2119                 case TK_M_SUBSYSTEMS:
2120                 case TK_M_DRIVERS:
2121                 case TK_M_ATTRS:
2122                 case TK_M_TAGS: {
2123                         struct token *next;
2124
2125                         /* get whole sequence of parent matches */
2126                         next = cur;
2127                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2128                                 next++;
2129
2130                         /* loop over parents */
2131                         event->dev_parent = event->dev;
2132                         for (;;) {
2133                                 struct token *key;
2134
2135                                 /* loop over sequence of parent match keys */
2136                                 for (key = cur; key < next; key++ ) {
2137                                         dump_token(rules, key);
2138                                         switch(key->type) {
2139                                         case TK_M_KERNELS:
2140                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2141                                                         goto try_parent;
2142                                                 break;
2143                                         case TK_M_SUBSYSTEMS:
2144                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2145                                                         goto try_parent;
2146                                                 break;
2147                                         case TK_M_DRIVERS:
2148                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2149                                                         goto try_parent;
2150                                                 break;
2151                                         case TK_M_ATTRS:
2152                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2153                                                         goto try_parent;
2154                                                 break;
2155                                         case TK_M_TAGS: {
2156                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2157
2158                                                 if (match && key->key.op == OP_NOMATCH)
2159                                                         goto try_parent;
2160                                                 if (!match && key->key.op == OP_MATCH)
2161                                                         goto try_parent;
2162                                                 break;
2163                                         }
2164                                         default:
2165                                                 goto nomatch;
2166                                         }
2167                                 }
2168                                 break;
2169
2170                         try_parent:
2171                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2172                                 if (event->dev_parent == NULL)
2173                                         goto nomatch;
2174                         }
2175                         /* move behind our sequence of parent match keys */
2176                         cur = next;
2177                         continue;
2178                 }
2179                 case TK_M_TEST: {
2180                         char filename[UTIL_PATH_SIZE];
2181                         struct stat statbuf;
2182                         int match;
2183
2184                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2185                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2186                                 if (filename[0] != '/') {
2187                                         char tmp[UTIL_PATH_SIZE];
2188
2189                                         util_strscpy(tmp, sizeof(tmp), filename);
2190                                         util_strscpyl(filename, sizeof(filename),
2191                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2192                                 }
2193                         }
2194                         attr_subst_subdir(filename, sizeof(filename));
2195
2196                         match = (stat(filename, &statbuf) == 0);
2197                         if (match && cur->key.mode > 0)
2198                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2199                         if (match && cur->key.op == OP_NOMATCH)
2200                                 goto nomatch;
2201                         if (!match && cur->key.op == OP_MATCH)
2202                                 goto nomatch;
2203                         break;
2204                 }
2205                 case TK_M_EVENT_TIMEOUT:
2206                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2207                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2208                         break;
2209                 case TK_M_PROGRAM: {
2210                         char program[UTIL_PATH_SIZE];
2211                         char **envp;
2212                         char result[UTIL_PATH_SIZE];
2213
2214                         free(event->program_result);
2215                         event->program_result = NULL;
2216                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2217                         envp = udev_device_get_properties_envp(event->dev);
2218                         log_debug("PROGRAM '%s' %s:%u\n",
2219                                   program,
2220                                   &rules->buf[rule->rule.filename_off],
2221                                   rule->rule.filename_line);
2222
2223                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2224                                 if (cur->key.op != OP_NOMATCH)
2225                                         goto nomatch;
2226                         } else {
2227                                 int count;
2228
2229                                 util_remove_trailing_chars(result, '\n');
2230                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2231                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2232                                         if (count > 0)
2233                                                 log_debug("%i character(s) replaced\n" , count);
2234                                 }
2235                                 event->program_result = strdup(result);
2236                                 if (cur->key.op == OP_NOMATCH)
2237                                         goto nomatch;
2238                         }
2239                         break;
2240                 }
2241                 case TK_M_IMPORT_FILE: {
2242                         char import[UTIL_PATH_SIZE];
2243
2244                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2245                         if (import_file_into_properties(event->dev, import) != 0)
2246                                 if (cur->key.op != OP_NOMATCH)
2247                                         goto nomatch;
2248                         break;
2249                 }
2250                 case TK_M_IMPORT_PROG: {
2251                         char import[UTIL_PATH_SIZE];
2252
2253                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2254                         log_debug("IMPORT '%s' %s:%u\n",
2255                                   import,
2256                                   &rules->buf[rule->rule.filename_off],
2257                                   rule->rule.filename_line);
2258
2259                         if (import_program_into_properties(event, import, sigmask) != 0)
2260                                 if (cur->key.op != OP_NOMATCH)
2261                                         goto nomatch;
2262                         break;
2263                 }
2264                 case TK_M_IMPORT_BUILTIN: {
2265                         char command[UTIL_PATH_SIZE];
2266
2267                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2268                                 /* check if we ran already */
2269                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2270                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2271                                                   udev_builtin_name(cur->key.builtin_cmd),
2272                                                   &rules->buf[rule->rule.filename_off],
2273                                                   rule->rule.filename_line);
2274                                         /* return the result from earlier run */
2275                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2276                                         if (cur->key.op != OP_NOMATCH)
2277                                                         goto nomatch;
2278                                         break;
2279                                 }
2280                                 /* mark as ran */
2281                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2282                         }
2283
2284                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2285                         log_debug("IMPORT builtin '%s' %s:%u\n",
2286                                   udev_builtin_name(cur->key.builtin_cmd),
2287                                   &rules->buf[rule->rule.filename_off],
2288                                   rule->rule.filename_line);
2289
2290                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2291                                 /* remember failure */
2292                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2293                                           udev_builtin_name(cur->key.builtin_cmd));
2294                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2295                                 if (cur->key.op != OP_NOMATCH)
2296                                         goto nomatch;
2297                         }
2298                         break;
2299                 }
2300                 case TK_M_IMPORT_DB: {
2301                         const char *key = &rules->buf[cur->key.value_off];
2302                         const char *value;
2303
2304                         value = udev_device_get_property_value(event->dev_db, key);
2305                         if (value != NULL) {
2306                                 struct udev_list_entry *entry;
2307
2308                                 entry = udev_device_add_property(event->dev, key, value);
2309                                 udev_list_entry_set_num(entry, true);
2310                         } else {
2311                                 if (cur->key.op != OP_NOMATCH)
2312                                         goto nomatch;
2313                         }
2314                         break;
2315                 }
2316                 case TK_M_IMPORT_CMDLINE: {
2317                         FILE *f;
2318                         bool imported = false;
2319
2320                         f = fopen("/proc/cmdline", "r");
2321                         if (f != NULL) {
2322                                 char cmdline[4096];
2323
2324                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2325                                         const char *key = &rules->buf[cur->key.value_off];
2326                                         char *pos;
2327
2328                                         pos = strstr(cmdline, key);
2329                                         if (pos != NULL) {
2330                                                 struct udev_list_entry *entry;
2331
2332                                                 pos += strlen(key);
2333                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2334                                                         /* we import simple flags as 'FLAG=1' */
2335                                                         entry = udev_device_add_property(event->dev, key, "1");
2336                                                         udev_list_entry_set_num(entry, true);
2337                                                         imported = true;
2338                                                 } else if (pos[0] == '=') {
2339                                                         const char *value;
2340
2341                                                         pos++;
2342                                                         value = pos;
2343                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2344                                                                 pos++;
2345                                                         pos[0] = '\0';
2346                                                         entry = udev_device_add_property(event->dev, key, value);
2347                                                         udev_list_entry_set_num(entry, true);
2348                                                         imported = true;
2349                                                 }
2350                                         }
2351                                 }
2352                                 fclose(f);
2353                         }
2354                         if (!imported && cur->key.op != OP_NOMATCH)
2355                                 goto nomatch;
2356                         break;
2357                 }
2358                 case TK_M_IMPORT_PARENT: {
2359                         char import[UTIL_PATH_SIZE];
2360
2361                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2362                         if (import_parent_into_properties(event->dev, import) != 0)
2363                                 if (cur->key.op != OP_NOMATCH)
2364                                         goto nomatch;
2365                         break;
2366                 }
2367                 case TK_M_RESULT:
2368                         if (match_key(rules, cur, event->program_result) != 0)
2369                                 goto nomatch;
2370                         break;
2371                 case TK_A_STRING_ESCAPE_NONE:
2372                         esc = ESCAPE_NONE;
2373                         break;
2374                 case TK_A_STRING_ESCAPE_REPLACE:
2375                         esc = ESCAPE_REPLACE;
2376                         break;
2377                 case TK_A_DB_PERSIST:
2378                         udev_device_set_db_persist(event->dev);
2379                         break;
2380                 case TK_A_INOTIFY_WATCH:
2381                         if (event->inotify_watch_final)
2382                                 break;
2383                         if (cur->key.op == OP_ASSIGN_FINAL)
2384                                 event->inotify_watch_final = true;
2385                         event->inotify_watch = cur->key.watch;
2386                         break;
2387                 case TK_A_DEVLINK_PRIO:
2388                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2389                         break;
2390                 case TK_A_OWNER: {
2391                         char owner[UTIL_NAME_SIZE];
2392
2393                         if (event->owner_final)
2394                                 break;
2395                         if (cur->key.op == OP_ASSIGN_FINAL)
2396                                 event->owner_final = true;
2397                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2398                         event->uid = util_lookup_user(event->udev, owner);
2399                         log_debug("OWNER %u %s:%u\n",
2400                                   event->uid,
2401                                   &rules->buf[rule->rule.filename_off],
2402                                   rule->rule.filename_line);
2403                         break;
2404                 }
2405                 case TK_A_GROUP: {
2406                         char group[UTIL_NAME_SIZE];
2407
2408                         if (event->group_final)
2409                                 break;
2410                         if (cur->key.op == OP_ASSIGN_FINAL)
2411                                 event->group_final = true;
2412                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2413                         event->gid = util_lookup_group(event->udev, group);
2414                         log_debug("GROUP %u %s:%u\n",
2415                                   event->gid,
2416                                   &rules->buf[rule->rule.filename_off],
2417                                   rule->rule.filename_line);
2418                         break;
2419                 }
2420                 case TK_A_MODE: {
2421                         char mode_str[UTIL_NAME_SIZE];
2422                         mode_t mode;
2423                         char *endptr;
2424
2425                         if (event->mode_final)
2426                                 break;
2427                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2428                         mode = strtol(mode_str, &endptr, 8);
2429                         if (endptr[0] != '\0') {
2430                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2431                                 break;
2432                         }
2433                         if (cur->key.op == OP_ASSIGN_FINAL)
2434                                 event->mode_final = true;
2435                         event->mode_set = true;
2436                         event->mode = mode;
2437                         log_debug("MODE %#o %s:%u\n",
2438                                   event->mode,
2439                                   &rules->buf[rule->rule.filename_off],
2440                                   rule->rule.filename_line);
2441                         break;
2442                 }
2443                 case TK_A_OWNER_ID:
2444                         if (event->owner_final)
2445                                 break;
2446                         if (cur->key.op == OP_ASSIGN_FINAL)
2447                                 event->owner_final = true;
2448                         event->uid = cur->key.uid;
2449                         log_debug("OWNER %u %s:%u\n",
2450                                   event->uid,
2451                                   &rules->buf[rule->rule.filename_off],
2452                                   rule->rule.filename_line);
2453                         break;
2454                 case TK_A_GROUP_ID:
2455                         if (event->group_final)
2456                                 break;
2457                         if (cur->key.op == OP_ASSIGN_FINAL)
2458                                 event->group_final = true;
2459                         event->gid = cur->key.gid;
2460                         log_debug("GROUP %u %s:%u\n",
2461                                   event->gid,
2462                                   &rules->buf[rule->rule.filename_off],
2463                                   rule->rule.filename_line);
2464                         break;
2465                 case TK_A_MODE_ID:
2466                         if (event->mode_final)
2467                                 break;
2468                         if (cur->key.op == OP_ASSIGN_FINAL)
2469                                 event->mode_final = true;
2470                         event->mode_set = true;
2471                         event->mode = cur->key.mode;
2472                         log_debug("MODE %#o %s:%u\n",
2473                                   event->mode,
2474                                   &rules->buf[rule->rule.filename_off],
2475                                   rule->rule.filename_line);
2476                         break;
2477                 case TK_A_ENV: {
2478                         const char *name = &rules->buf[cur->key.attr_off];
2479                         char *value = &rules->buf[cur->key.value_off];
2480
2481                         if (value[0] != '\0') {
2482                                 char temp_value[UTIL_NAME_SIZE];
2483                                 struct udev_list_entry *entry;
2484
2485                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2486                                 entry = udev_device_add_property(event->dev, name, temp_value);
2487                                 /* store in db, skip private keys */
2488                                 if (name[0] != '.')
2489                                         udev_list_entry_set_num(entry, true);
2490                         } else {
2491                                 udev_device_add_property(event->dev, name, NULL);
2492                         }
2493                         break;
2494                 }
2495                 case TK_A_TAG: {
2496                         char tag[UTIL_PATH_SIZE];
2497                         const char *p;
2498
2499                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2500                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2501                                 udev_device_cleanup_tags_list(event->dev);
2502                         for (p = tag; *p != '\0'; p++) {
2503                                 if ((*p >= 'a' && *p <= 'z') ||
2504                                     (*p >= 'A' && *p <= 'Z') ||
2505                                     (*p >= '0' && *p <= '9') ||
2506                                     *p == '-' || *p == '_')
2507                                         continue;
2508                                 log_error("ignoring invalid tag name '%s'\n", tag);
2509                                 break;
2510                         }
2511                         udev_device_add_tag(event->dev, tag);
2512                         break;
2513                 }
2514                 case TK_A_NAME: {
2515                         const char *name  = &rules->buf[cur->key.value_off];
2516
2517                         char name_str[UTIL_PATH_SIZE];
2518                         int count;
2519
2520                         if (event->name_final)
2521                                 break;
2522                         if (cur->key.op == OP_ASSIGN_FINAL)
2523                                 event->name_final = true;
2524                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2525                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2526                                 count = util_replace_chars(name_str, "/");
2527                                 if (count > 0)
2528                                         log_debug("%i character(s) replaced\n", count);
2529                         }
2530                         if (major(udev_device_get_devnum(event->dev)) &&
2531                             (!streq(name_str, udev_device_get_devnode(event->dev) + strlen(TEST_PREFIX "/dev/")))) {
2532                                 log_error("NAME=\"%s\" ignored, kernel device nodes "
2533                                     "can not be renamed; please fix it in %s:%u\n", name,
2534                                     &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2535                                 break;
2536                         }
2537                         free(event->name);
2538                         event->name = strdup(name_str);
2539                         log_debug("NAME '%s' %s:%u\n",
2540                                   event->name,
2541                                   &rules->buf[rule->rule.filename_off],
2542                                   rule->rule.filename_line);
2543                         break;
2544                 }
2545                 case TK_A_DEVLINK: {
2546                         char temp[UTIL_PATH_SIZE];
2547                         char filename[UTIL_PATH_SIZE];
2548                         char *pos, *next;
2549                         int count = 0;
2550
2551                         if (event->devlink_final)
2552                                 break;
2553                         if (major(udev_device_get_devnum(event->dev)) == 0)
2554                                 break;
2555                         if (cur->key.op == OP_ASSIGN_FINAL)
2556                                 event->devlink_final = true;
2557                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2558                                 udev_device_cleanup_devlinks_list(event->dev);
2559
2560                         /* allow  multiple symlinks separated by spaces */
2561                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2562                         if (esc == ESCAPE_UNSET)
2563                                 count = util_replace_chars(temp, "/ ");
2564                         else if (esc == ESCAPE_REPLACE)
2565                                 count = util_replace_chars(temp, "/");
2566                         if (count > 0)
2567                                 log_debug("%i character(s) replaced\n" , count);
2568                         pos = temp;
2569                         while (isspace(pos[0]))
2570                                 pos++;
2571                         next = strchr(pos, ' ');
2572                         while (next != NULL) {
2573                                 next[0] = '\0';
2574                                 log_debug("LINK '%s' %s:%u\n", pos,
2575                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2576                                 util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", pos, NULL);
2577                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2578                                 while (isspace(next[1]))
2579                                         next++;
2580                                 pos = &next[1];
2581                                 next = strchr(pos, ' ');
2582                         }
2583                         if (pos[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), TEST_PREFIX "/dev/", pos, NULL);
2587                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2588                         }
2589                         break;
2590                 }
2591                 case TK_A_ATTR: {
2592                         const char *key_name = &rules->buf[cur->key.attr_off];
2593                         char attr[UTIL_PATH_SIZE];
2594                         char value[UTIL_NAME_SIZE];
2595                         FILE *f;
2596
2597                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2598                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2599                         attr_subst_subdir(attr, sizeof(attr));
2600
2601                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2602                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2603                                   &rules->buf[rule->rule.filename_off],
2604                                   rule->rule.filename_line);
2605                         f = fopen(attr, "w");
2606                         if (f != NULL) {
2607                                 if (fprintf(f, "%s", value) <= 0)
2608                                         log_error("error writing ATTR{%s}: %m\n", attr);
2609                                 fclose(f);
2610                         } else {
2611                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2612                         }
2613                         break;
2614                 }
2615                 case TK_A_RUN_BUILTIN:
2616                 case TK_A_RUN_PROGRAM: {
2617                         struct udev_list_entry *entry;
2618
2619                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2620                                 udev_list_cleanup(&event->run_list);
2621                         log_debug("RUN '%s' %s:%u\n",
2622                                   &rules->buf[cur->key.value_off],
2623                                   &rules->buf[rule->rule.filename_off],
2624                                   rule->rule.filename_line);
2625                         entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2626                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2627                         break;
2628                 }
2629                 case TK_A_GOTO:
2630                         if (cur->key.rule_goto == 0)
2631                                 break;
2632                         cur = &rules->tokens[cur->key.rule_goto];
2633                         continue;
2634                 case TK_END:
2635                         return 0;
2636
2637                 case TK_M_PARENTS_MIN:
2638                 case TK_M_PARENTS_MAX:
2639                 case TK_M_MAX:
2640                 case TK_UNSET:
2641                         log_error("wrong type %u\n", cur->type);
2642                         goto nomatch;
2643                 }
2644
2645                 cur++;
2646                 continue;
2647         nomatch:
2648                 /* fast-forward to next rule */
2649                 cur = rule + rule->rule.token_count;
2650         }
2651 }
2652
2653 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2654 {
2655         struct token *cur;
2656         struct token *rule;
2657         uid_t uid = 0;
2658         gid_t gid = 0;
2659         mode_t mode = 0;
2660
2661         if (rules->tokens == NULL)
2662                 return;
2663
2664         cur = &rules->tokens[0];
2665         rule = cur;
2666         for (;;) {
2667                 switch (cur->type) {
2668                 case TK_RULE:
2669                         /* current rule */
2670                         rule = cur;
2671
2672                         /* skip rules without a static_node tag */
2673                         if (!rule->rule.has_static_node)
2674                                 goto next;
2675
2676                         uid = 0;
2677                         gid = 0;
2678                         mode = 0;
2679                         break;
2680                 case TK_A_OWNER_ID:
2681                         uid = cur->key.uid;
2682                         break;
2683                 case TK_A_GROUP_ID:
2684                         gid = cur->key.gid;
2685                         break;
2686                 case TK_A_MODE_ID:
2687                         mode = cur->key.mode;
2688                         break;
2689                 case TK_A_STATIC_NODE: {
2690                         char filename[UTIL_PATH_SIZE];
2691                         struct stat stats;
2692
2693                         /* we assure, that the permissions tokens are sorted before the static token */
2694                         if (mode == 0 && uid == 0 && gid == 0)
2695                                 goto next;
2696                         util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/",
2697                                       &rules->buf[cur->key.value_off], NULL);
2698                         if (stat(filename, &stats) != 0)
2699                                 goto next;
2700                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2701                                 goto next;
2702                         if (mode == 0) {
2703                                 if (gid > 0)
2704                                         mode = 0660;
2705                                 else
2706                                         mode = 0600;
2707                         }
2708                         if (mode != (stats.st_mode & 01777)) {
2709                                 chmod(filename, mode);
2710                                 log_debug("chmod '%s' %#o\n", filename, mode);
2711                         }
2712
2713                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2714                                 chown(filename, uid, gid);
2715                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2716                         }
2717
2718                         utimensat(AT_FDCWD, filename, NULL, 0);
2719                         break;
2720                 }
2721                 case TK_END:
2722                         return;
2723                 }
2724
2725                 cur++;
2726                 continue;
2727 next:
2728                 /* fast-forward to next rule */
2729                 cur = rule + rule->rule.token_count;
2730                 continue;
2731         }
2732 }