udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN                  2048
  36 #define PREALLOC_STRBUF                 32 * 1024
  37 #define PREALLOC_TRIE                   256
  38
  39 struct uid_gid {
  40         unsigned int name_off;
  41         union {
  42                 uid_t   uid;
  43                 gid_t   gid;
  44         };
  45 };
  46
  47 struct trie_node {
  48         /* this node's first child */
  49         unsigned int child_idx;
  50         /* the next child of our parent node's child list */
  51         unsigned int next_child_idx;
  52         /* this node's last child (shortcut for append) */
  53         unsigned int last_child_idx;
  54         unsigned int value_off;
  55         unsigned short value_len;
  56         unsigned char key;
  57 };
  58
  59 struct udev_rules {
  60         struct udev *udev;
  61         int resolve_names;
  62
  63         /* every key in the rules file becomes a token */
  64         struct token *tokens;
  65         unsigned int token_cur;
  66         unsigned int token_max;
  67
  68         /* all key strings are copied to a single string buffer */
  69         char *buf;
  70         size_t buf_cur;
  71         size_t buf_max;
  72         unsigned int buf_count;
  73
  74         /* during rule parsing, strings are indexed to find duplicates */
  75         struct trie_node *trie_nodes;
  76         unsigned int trie_nodes_cur;
  77         unsigned int trie_nodes_max;
  78
  79         /* during rule parsing, uid/gid lookup results are cached */
  80         struct uid_gid *uids;
  81         unsigned int uids_cur;
  82         unsigned int uids_max;
  83         struct uid_gid *gids;
  84         unsigned int gids_cur;
  85         unsigned int gids_max;
  86 };
  87
  88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  89 enum operation_type {
  90         OP_UNSET,
  91
  92         OP_MATCH,
  93         OP_NOMATCH,
  94         OP_MATCH_MAX,
  95
  96         OP_ADD,
  97         OP_ASSIGN,
  98         OP_ASSIGN_FINAL,
  99 };
 100
 101 enum string_glob_type {
 102         GL_UNSET,
 103         GL_PLAIN,                       /* no special chars */
 104         GL_GLOB,                        /* shell globs ?,*,[] */
 105         GL_SPLIT,                       /* multi-value A|B */
 106         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 107         GL_SOMETHING,                   /* commonly used "?*" */
 108 };
 109
 110 enum string_subst_type {
 111         SB_UNSET,
 112         SB_NONE,
 113         SB_FORMAT,
 114         SB_SUBSYS,
 115 };
 116
 117 /* tokens of a rule are sorted/handled in this order */
 118 enum token_type {
 119         TK_UNSET,
 120         TK_RULE,
 121
 122         TK_M_ACTION,                    /* val */
 123         TK_M_DEVPATH,                   /* val */
 124         TK_M_KERNEL,                    /* val */
 125         TK_M_DEVLINK,                   /* val */
 126         TK_M_NAME,                      /* val */
 127         TK_M_ENV,                       /* val, attr */
 128         TK_M_TAG,                       /* val */
 129         TK_M_SUBSYSTEM,                 /* val */
 130         TK_M_DRIVER,                    /* val */
 131         TK_M_WAITFOR,                   /* val */
 132         TK_M_ATTR,                      /* val, attr */
 133
 134         TK_M_PARENTS_MIN,
 135         TK_M_KERNELS,                   /* val */
 136         TK_M_SUBSYSTEMS,                /* val */
 137         TK_M_DRIVERS,                   /* val */
 138         TK_M_ATTRS,                     /* val, attr */
 139         TK_M_PARENTS_MAX,
 140
 141         TK_M_TEST,                      /* val, mode_t */
 142         TK_M_PROGRAM,                   /* val */
 143         TK_M_IMPORT_FILE,               /* val */
 144         TK_M_IMPORT_PROG,               /* val */
 145         TK_M_IMPORT_DB,                 /* val */
 146         TK_M_IMPORT_PARENT,             /* val */
 147         TK_M_RESULT,                    /* val */
 148         TK_M_MAX,
 149
 150         TK_A_STRING_ESCAPE_NONE,
 151         TK_A_STRING_ESCAPE_REPLACE,
 152         TK_A_INOTIFY_WATCH,             /* int */
 153         TK_A_DEVLINK_PRIO,              /* int */
 154         TK_A_OWNER,                     /* val */
 155         TK_A_GROUP,                     /* val */
 156         TK_A_MODE,                      /* val */
 157         TK_A_OWNER_ID,                  /* uid_t */
 158         TK_A_GROUP_ID,                  /* gid_t */
 159         TK_A_MODE_ID,                   /* mode_t */
 160         TK_A_ENV,                       /* val, attr */
 161         TK_A_TAG,                       /* val */
 162         TK_A_NAME,                      /* val */
 163         TK_A_DEVLINK,                   /* val */
 164         TK_A_EVENT_TIMEOUT,             /* int */
 165         TK_A_ATTR,                      /* val, attr */
 166         TK_A_RUN,                       /* val, bool */
 167         TK_A_GOTO,                      /* size_t */
 168
 169         TK_END,
 170 };
 171
 172 /* we try to pack stuff in a way that we take only 12 bytes per token */
 173 struct token {
 174         union {
 175                 unsigned char type;             /* same as in rule and key */
 176                 struct {
 177                         enum token_type type:8;
 178                         unsigned int flags:8;
 179                         unsigned short token_count;
 180                         unsigned int label_off;
 181                         unsigned short filename_off;
 182                         unsigned short filename_line;
 183                 } rule;
 184                 struct {
 185                         enum token_type type:8;
 186                         enum operation_type op:8;
 187                         enum string_glob_type glob:8;
 188                         enum string_subst_type subst:4;
 189                         enum string_subst_type attrsubst:4;
 190                         unsigned int value_off;
 191                         union {
 192                                 unsigned int attr_off;
 193                                 int devlink_unique;
 194                                 int fail_on_error;
 195                                 unsigned int rule_goto;
 196                                 mode_t  mode;
 197                                 uid_t uid;
 198                                 gid_t gid;
 199                                 int devlink_prio;
 200                                 int event_timeout;
 201                                 int watch;
 202                         };
 203                 } key;
 204         };
 205 };
 206
 207 #define MAX_TK          64
 208 struct rule_tmp {
 209         struct udev_rules *rules;
 210         struct token rule;
 211         struct token token[MAX_TK];
 212         unsigned int token_cur;
 213 };
 214
 215 #ifdef ENABLE_DEBUG
 216 static const char *operation_str(enum operation_type type)
 217 {
 218         static const char *operation_strs[] = {
 219                 [OP_UNSET] =            "UNSET",
 220                 [OP_MATCH] =            "match",
 221                 [OP_NOMATCH] =          "nomatch",
 222                 [OP_MATCH_MAX] =        "MATCH_MAX",
 223
 224                 [OP_ADD] =              "add",
 225                 [OP_ASSIGN] =           "assign",
 226                 [OP_ASSIGN_FINAL] =     "assign-final",
 227 }       ;
 228
 229         return operation_strs[type];
 230 }
 231
 232 static const char *string_glob_str(enum string_glob_type type)
 233 {
 234         static const char *string_glob_strs[] = {
 235                 [GL_UNSET] =            "UNSET",
 236                 [GL_PLAIN] =            "plain",
 237                 [GL_GLOB] =             "glob",
 238                 [GL_SPLIT] =            "split",
 239                 [GL_SPLIT_GLOB] =       "split-glob",
 240                 [GL_SOMETHING] =        "split-glob",
 241         };
 242
 243         return string_glob_strs[type];
 244 }
 245
 246 static const char *token_str(enum token_type type)
 247 {
 248         static const char *token_strs[] = {
 249                 [TK_UNSET] =                    "UNSET",
 250                 [TK_RULE] =                     "RULE",
 251
 252                 [TK_M_ACTION] =                 "M ACTION",
 253                 [TK_M_DEVPATH] =                "M DEVPATH",
 254                 [TK_M_KERNEL] =                 "M KERNEL",
 255                 [TK_M_DEVLINK] =                "M DEVLINK",
 256                 [TK_M_NAME] =                   "M NAME",
 257                 [TK_M_ENV] =                    "M ENV",
 258                 [TK_M_TAG] =                    "M TAG",
 259                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 260                 [TK_M_DRIVER] =                 "M DRIVER",
 261                 [TK_M_WAITFOR] =                "M WAITFOR",
 262                 [TK_M_ATTR] =                   "M ATTR",
 263
 264                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 265                 [TK_M_KERNELS] =                "M KERNELS",
 266                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 267                 [TK_M_DRIVERS] =                "M DRIVERS",
 268                 [TK_M_ATTRS] =                  "M ATTRS",
 269                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 270
 271                 [TK_M_TEST] =                   "M TEST",
 272                 [TK_M_PROGRAM] =                "M PROGRAM",
 273                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 274                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 275                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 276                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 277                 [TK_M_RESULT] =                 "M RESULT",
 278                 [TK_M_MAX] =                    "M MAX",
 279
 280                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 281                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 282                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 283                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 284                 [TK_A_OWNER] =                  "A OWNER",
 285                 [TK_A_GROUP] =                  "A GROUP",
 286                 [TK_A_MODE] =                   "A MODE",
 287                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 288                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 289                 [TK_A_MODE_ID] =                "A MODE_ID",
 290                 [TK_A_ENV] =                    "A ENV",
 291                 [TK_A_TAG] =                    "A ENV",
 292                 [TK_A_NAME] =                   "A NAME",
 293                 [TK_A_DEVLINK] =                "A DEVLINK",
 294                 [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 295                 [TK_A_ATTR] =                   "A ATTR",
 296                 [TK_A_RUN] =                    "A RUN",
 297                 [TK_A_GOTO] =                   "A GOTO",
 298
 299                 [TK_END] =                      "END",
 300         };
 301
 302         return token_strs[type];
 303 }
 304
 305 static void dump_token(struct udev_rules *rules, struct token *token)
 306 {
 307         enum token_type type = token->type;
 308         enum operation_type op = token->key.op;
 309         enum string_glob_type glob = token->key.glob;
 310         const char *value = &rules->buf[token->key.value_off];
 311         const char *attr = &rules->buf[token->key.attr_off];
 312
 313         switch (type) {
 314         case TK_RULE:
 315                 {
 316                         const char *tks_ptr = (char *)rules->tokens;
 317                         const char *tk_ptr = (char *)token;
 318                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 319
 320                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s', flags: 0x%02x\n",
 321                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 322                             idx, token->rule.token_count,
 323                             &rules->buf[token->rule.label_off],
 324                             token->rule.flags);
 325                         break;
 326                 }
 327         case TK_M_ACTION:
 328         case TK_M_DEVPATH:
 329         case TK_M_KERNEL:
 330         case TK_M_SUBSYSTEM:
 331         case TK_M_DRIVER:
 332         case TK_M_WAITFOR:
 333         case TK_M_DEVLINK:
 334         case TK_M_NAME:
 335         case TK_M_KERNELS:
 336         case TK_M_SUBSYSTEMS:
 337         case TK_M_DRIVERS:
 338         case TK_M_PROGRAM:
 339         case TK_M_IMPORT_FILE:
 340         case TK_M_IMPORT_PROG:
 341         case TK_M_IMPORT_DB:
 342         case TK_M_IMPORT_PARENT:
 343         case TK_M_RESULT:
 344         case TK_A_NAME:
 345         case TK_A_DEVLINK:
 346         case TK_A_OWNER:
 347         case TK_A_GROUP:
 348         case TK_A_MODE:
 349         case TK_A_RUN:
 350                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 351                     token_str(type), operation_str(op), value, string_glob_str(glob));
 352                 break;
 353         case TK_M_ATTR:
 354         case TK_M_ATTRS:
 355         case TK_M_ENV:
 356         case TK_A_ATTR:
 357         case TK_A_ENV:
 358                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 359                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 360                 break;
 361         case TK_M_TAG:
 362         case TK_A_TAG:
 363                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 364                 break;
 365         case TK_A_STRING_ESCAPE_NONE:
 366         case TK_A_STRING_ESCAPE_REPLACE:
 367                 dbg(rules->udev, "%s\n", token_str(type));
 368                 break;
 369         case TK_M_TEST:
 370                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 371                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 372                 break;
 373         case TK_A_INOTIFY_WATCH:
 374                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 375                 break;
 376         case TK_A_DEVLINK_PRIO:
 377                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.devlink_prio);
 378                 break;
 379         case TK_A_OWNER_ID:
 380                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 381                 break;
 382         case TK_A_GROUP_ID:
 383                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 384                 break;
 385         case TK_A_MODE_ID:
 386                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 387                 break;
 388         case TK_A_EVENT_TIMEOUT:
 389                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.event_timeout);
 390                 break;
 391         case TK_A_GOTO:
 392                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 393                 break;
 394         case TK_END:
 395                 dbg(rules->udev, "* %s\n", token_str(type));
 396                 break;
 397         case TK_M_PARENTS_MIN:
 398         case TK_M_PARENTS_MAX:
 399         case TK_M_MAX:
 400         case TK_UNSET:
 401                 dbg(rules->udev, "unknown type %u\n", type);
 402                 break;
 403         }
 404 }
 405
 406 static void dump_rules(struct udev_rules *rules)
 407 {
 408         unsigned int i;
 409
 410         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 411             rules->token_cur,
 412             rules->token_cur * sizeof(struct token),
 413             rules->buf_count,
 414             rules->buf_cur);
 415         for(i = 0; i < rules->token_cur; i++)
 416                 dump_token(rules, &rules->tokens[i]);
 417 }
 418 #else
 419 static inline const char *operation_str(enum operation_type type) { return NULL; }
 420 static inline const char *token_str(enum token_type type) { return NULL; }
 421 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 422 static inline void dump_rules(struct udev_rules *rules) {}
 423 #endif /* ENABLE_DEBUG */
 424
 425 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 426 {
 427         int off;
 428
 429         /* grow buffer if needed */
 430         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 431                 char *buf;
 432                 unsigned int add;
 433
 434                 /* double the buffer size */
 435                 add = rules->buf_max;
 436                 if (add < bytes * 8)
 437                         add = bytes * 8;
 438
 439                 buf = realloc(rules->buf, rules->buf_max + add);
 440                 if (buf == NULL)
 441                         return -1;
 442                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 443                 rules->buf = buf;
 444                 rules->buf_max += add;
 445         }
 446         off = rules->buf_cur;
 447         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 448         rules->buf_cur += bytes;
 449         rules->buf_count++;
 450         return off;
 451 }
 452
 453 static int add_string(struct udev_rules *rules, const char *str)
 454 {
 455         unsigned int node_idx;
 456         struct trie_node *new_node;
 457         unsigned int new_node_idx;
 458         unsigned char key;
 459         unsigned short len;
 460         unsigned int depth;
 461         unsigned int off;
 462         struct trie_node *parent;
 463
 464         /* walk trie, start from last character of str to find matching tails */
 465         len = strlen(str);
 466         key = str[len-1];
 467         node_idx = 0;
 468         for (depth = 0; depth <= len; depth++) {
 469                 struct trie_node *node;
 470                 unsigned int child_idx;
 471
 472                 node = &rules->trie_nodes[node_idx];
 473                 off = node->value_off + node->value_len - len;
 474
 475                 /* match against current node */
 476                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 477                         return off;
 478
 479                 /* lookup child node */
 480                 key = str[len - 1 - depth];
 481                 child_idx = node->child_idx;
 482                 while (child_idx > 0) {
 483                         struct trie_node *child;
 484
 485                         child = &rules->trie_nodes[child_idx];
 486                         if (child->key == key)
 487                                 break;
 488                         child_idx = child->next_child_idx;
 489                 }
 490                 if (child_idx == 0)
 491                         break;
 492                 node_idx = child_idx;
 493         }
 494
 495         /* string not found, add it */
 496         off = add_new_string(rules, str, len + 1);
 497
 498         /* grow trie nodes if needed */
 499         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 500                 struct trie_node *nodes;
 501                 unsigned int add;
 502
 503                 /* double the buffer size */
 504                 add = rules->trie_nodes_max;
 505                 if (add < 8)
 506                         add = 8;
 507
 508                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 509                 if (nodes == NULL)
 510                         return -1;
 511                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 512                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 513                 rules->trie_nodes = nodes;
 514                 rules->trie_nodes_max += add;
 515         }
 516
 517         /* get a new node */
 518         new_node_idx = rules->trie_nodes_cur;
 519         rules->trie_nodes_cur++;
 520         new_node = &rules->trie_nodes[new_node_idx];
 521         memset(new_node, 0x00, sizeof(struct trie_node));
 522         new_node->value_off = off;
 523         new_node->value_len = len;
 524         new_node->key = key;
 525
 526         /* join the parent's child list */
 527         parent = &rules->trie_nodes[node_idx];
 528         if (parent->child_idx == 0) {
 529                 parent->child_idx = new_node_idx;
 530         } else {
 531                 struct trie_node *last_child;
 532
 533                 last_child = &rules->trie_nodes[parent->last_child_idx];
 534                 last_child->next_child_idx = new_node_idx;
 535         }
 536         parent->last_child_idx = new_node_idx;
 537         return off;
 538 }
 539
 540 static int add_token(struct udev_rules *rules, struct token *token)
 541 {
 542         /* grow buffer if needed */
 543         if (rules->token_cur+1 >= rules->token_max) {
 544                 struct token *tokens;
 545                 unsigned int add;
 546
 547                 /* double the buffer size */
 548                 add = rules->token_max;
 549                 if (add < 8)
 550                         add = 8;
 551
 552                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 553                 if (tokens == NULL)
 554                         return -1;
 555                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 556                 rules->tokens = tokens;
 557                 rules->token_max += add;
 558         }
 559         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 560         rules->token_cur++;
 561         return 0;
 562 }
 563
 564 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 565 {
 566         unsigned int i;
 567         uid_t uid;
 568         unsigned int off;
 569
 570         /* lookup, if we know it already */
 571         for (i = 0; i < rules->uids_cur; i++) {
 572                 off = rules->uids[i].name_off;
 573                 if (strcmp(&rules->buf[off], owner) == 0) {
 574                         uid = rules->uids[i].uid;
 575                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 576                         return uid;
 577                 }
 578         }
 579         uid = util_lookup_user(rules->udev, owner);
 580
 581         /* grow buffer if needed */
 582         if (rules->uids_cur+1 >= rules->uids_max) {
 583                 struct uid_gid *uids;
 584                 unsigned int add;
 585
 586                 /* double the buffer size */
 587                 add = rules->uids_max;
 588                 if (add < 1)
 589                         add = 8;
 590
 591                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 592                 if (uids == NULL)
 593                         return uid;
 594                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 595                 rules->uids = uids;
 596                 rules->uids_max += add;
 597         }
 598         rules->uids[rules->uids_cur].uid = uid;
 599         off = add_string(rules, owner);
 600         if (off <= 0)
 601                 return uid;
 602         rules->uids[rules->uids_cur].name_off = off;
 603         rules->uids_cur++;
 604         return uid;
 605 }
 606
 607 static gid_t add_gid(struct udev_rules *rules, const char *group)
 608 {
 609         unsigned int i;
 610         gid_t gid;
 611         unsigned int off;
 612
 613         /* lookup, if we know it already */
 614         for (i = 0; i < rules->gids_cur; i++) {
 615                 off = rules->gids[i].name_off;
 616                 if (strcmp(&rules->buf[off], group) == 0) {
 617                         gid = rules->gids[i].gid;
 618                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 619                         return gid;
 620                 }
 621         }
 622         gid = util_lookup_group(rules->udev, group);
 623
 624         /* grow buffer if needed */
 625         if (rules->gids_cur+1 >= rules->gids_max) {
 626                 struct uid_gid *gids;
 627                 unsigned int add;
 628
 629                 /* double the buffer size */
 630                 add = rules->gids_max;
 631                 if (add < 1)
 632                         add = 8;
 633
 634                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 635                 if (gids == NULL)
 636                         return gid;
 637                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 638                 rules->gids = gids;
 639                 rules->gids_max += add;
 640         }
 641         rules->gids[rules->gids_cur].gid = gid;
 642         off = add_string(rules, group);
 643         if (off <= 0)
 644                 return gid;
 645         rules->gids[rules->gids_cur].name_off = off;
 646         rules->gids_cur++;
 647         return gid;
 648 }
 649
 650 static int import_property_from_string(struct udev_device *dev, char *line)
 651 {
 652         struct udev *udev = udev_device_get_udev(dev);
 653         char *key;
 654         char *val;
 655         size_t len;
 656
 657         /* find key */
 658         key = line;
 659         while (isspace(key[0]))
 660                 key++;
 661
 662         /* comment or empty line */
 663         if (key[0] == '#' || key[0] == '\0')
 664                 return -1;
 665
 666         /* split key/value */
 667         val = strchr(key, '=');
 668         if (val == NULL)
 669                 return -1;
 670         val[0] = '\0';
 671         val++;
 672
 673         /* find value */
 674         while (isspace(val[0]))
 675                 val++;
 676
 677         /* terminate key */
 678         len = strlen(key);
 679         if (len == 0)
 680                 return -1;
 681         while (isspace(key[len-1]))
 682                 len--;
 683         key[len] = '\0';
 684
 685         /* terminate value */
 686         len = strlen(val);
 687         if (len == 0)
 688                 return -1;
 689         while (isspace(val[len-1]))
 690                 len--;
 691         val[len] = '\0';
 692
 693         if (len == 0)
 694                 return -1;
 695
 696         /* unquote */
 697         if (val[0] == '"' || val[0] == '\'') {
 698                 if (val[len-1] != val[0]) {
 699                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 700                         return -1;
 701                 }
 702                 val[len-1] = '\0';
 703                 val++;
 704         }
 705
 706         dbg(udev, "adding '%s'='%s'\n", key, val);
 707
 708         /* handle device, renamed by external tool, returning new path */
 709         if (strcmp(key, "DEVPATH") == 0) {
 710                 char syspath[UTIL_PATH_SIZE];
 711
 712                 info(udev, "updating devpath from '%s' to '%s'\n",
 713                      udev_device_get_devpath(dev), val);
 714                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 715                 udev_device_set_syspath(dev, syspath);
 716         } else {
 717                 struct udev_list_entry *entry;
 718
 719                 entry = udev_device_add_property(dev, key, val);
 720                 /* store in db, skip private keys */
 721                 if (key[0] != '.')
 722                         udev_list_entry_set_flags(entry, 1);
 723         }
 724         return 0;
 725 }
 726
 727 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 728 {
 729         FILE *f;
 730         char line[UTIL_LINE_SIZE];
 731
 732         f = fopen(filename, "r");
 733         if (f == NULL)
 734                 return -1;
 735         while (fgets(line, sizeof(line), f) != NULL)
 736                 import_property_from_string(dev, line);
 737         fclose(f);
 738         return 0;
 739 }
 740
 741 static int import_program_into_properties(struct udev_device *dev, const char *program)
 742 {
 743         struct udev *udev = udev_device_get_udev(dev);
 744         char **envp;
 745         char result[4096];
 746         size_t reslen;
 747         char *line;
 748
 749         envp = udev_device_get_properties_envp(dev);
 750         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL, false) != 0)
 751                 return -1;
 752
 753         line = result;
 754         while (line != NULL) {
 755                 char *pos;
 756
 757                 pos = strchr(line, '\n');
 758                 if (pos != NULL) {
 759                         pos[0] = '\0';
 760                         pos = &pos[1];
 761                 }
 762                 import_property_from_string(dev, line);
 763                 line = pos;
 764         }
 765         return 0;
 766 }
 767
 768 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 769 {
 770         struct udev *udev = udev_device_get_udev(dev);
 771         struct udev_device *dev_parent;
 772         struct udev_list_entry *list_entry;
 773
 774         dev_parent = udev_device_get_parent(dev);
 775         if (dev_parent == NULL)
 776                 return -1;
 777
 778         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 779         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 780                 const char *key = udev_list_entry_get_name(list_entry);
 781                 const char *val = udev_list_entry_get_value(list_entry);
 782
 783                 if (fnmatch(filter, key, 0) == 0) {
 784                         struct udev_list_entry *entry;
 785
 786                         dbg(udev, "import key '%s=%s'\n", key, val);
 787                         entry = udev_device_add_property(dev, key, val);
 788                         /* store in db, skip private keys */
 789                         if (key[0] != '.')
 790                                 udev_list_entry_set_flags(entry, 1);
 791                 }
 792         }
 793         return 0;
 794 }
 795
 796 #define WAIT_LOOP_PER_SECOND            50
 797 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 798 {
 799         struct udev *udev = udev_device_get_udev(dev);
 800         char filepath[UTIL_PATH_SIZE];
 801         char devicepath[UTIL_PATH_SIZE];
 802         struct stat stats;
 803         int loop = timeout * WAIT_LOOP_PER_SECOND;
 804
 805         /* a relative path is a device attribute */
 806         devicepath[0] = '\0';
 807         if (file[0] != '/') {
 808                 util_strscpyl(devicepath, sizeof(devicepath),
 809                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 810                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 811                 file = filepath;
 812         }
 813
 814         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 815         while (--loop) {
 816                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 817
 818                 /* lookup file */
 819                 if (stat(file, &stats) == 0) {
 820                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 821                         return 0;
 822                 }
 823                 /* make sure, the device did not disappear in the meantime */
 824                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 825                         info(udev, "device disappeared while waiting for '%s'\n", file);
 826                         return -2;
 827                 }
 828                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 829                 nanosleep(&duration, NULL);
 830         }
 831         info(udev, "waiting for '%s' failed\n", file);
 832         return -1;
 833 }
 834
 835 static int attr_subst_subdir(char *attr, size_t len)
 836 {
 837         int found = 0;
 838
 839         if (strstr(attr, "/*/")) {
 840                 char *pos;
 841                 char dirname[UTIL_PATH_SIZE];
 842                 const char *tail;
 843                 DIR *dir;
 844
 845                 util_strscpy(dirname, sizeof(dirname), attr);
 846                 pos = strstr(dirname, "/*/");
 847                 if (pos == NULL)
 848                         return -1;
 849                 pos[0] = '\0';
 850                 tail = &pos[2];
 851                 dir = opendir(dirname);
 852                 if (dir != NULL) {
 853                         struct dirent *dent;
 854
 855                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 856                                 struct stat stats;
 857
 858                                 if (dent->d_name[0] == '.')
 859                                         continue;
 860                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 861                                 if (stat(attr, &stats) == 0) {
 862                                         found = 1;
 863                                         break;
 864                                 }
 865                         }
 866                         closedir(dir);
 867                 }
 868         }
 869
 870         return found;
 871 }
 872
 873 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 874 {
 875         char *linepos;
 876         char *temp;
 877
 878         linepos = *line;
 879         if (linepos == NULL || linepos[0] == '\0')
 880                 return -1;
 881
 882         /* skip whitespace */
 883         while (isspace(linepos[0]) || linepos[0] == ',')
 884                 linepos++;
 885
 886         /* get the key */
 887         if (linepos[0] == '\0')
 888                 return -1;
 889         *key = linepos;
 890
 891         while (1) {
 892                 linepos++;
 893                 if (linepos[0] == '\0')
 894                         return -1;
 895                 if (isspace(linepos[0]))
 896                         break;
 897                 if (linepos[0] == '=')
 898                         break;
 899                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 900                         if (linepos[1] == '=')
 901                                 break;
 902         }
 903
 904         /* remember end of key */
 905         temp = linepos;
 906
 907         /* skip whitespace after key */
 908         while (isspace(linepos[0]))
 909                 linepos++;
 910         if (linepos[0] == '\0')
 911                 return -1;
 912
 913         /* get operation type */
 914         if (linepos[0] == '=' && linepos[1] == '=') {
 915                 *op = OP_MATCH;
 916                 linepos += 2;
 917         } else if (linepos[0] == '!' && linepos[1] == '=') {
 918                 *op = OP_NOMATCH;
 919                 linepos += 2;
 920         } else if (linepos[0] == '+' && linepos[1] == '=') {
 921                 *op = OP_ADD;
 922                 linepos += 2;
 923         } else if (linepos[0] == '=') {
 924                 *op = OP_ASSIGN;
 925                 linepos++;
 926         } else if (linepos[0] == ':' && linepos[1] == '=') {
 927                 *op = OP_ASSIGN_FINAL;
 928                 linepos += 2;
 929         } else
 930                 return -1;
 931
 932         /* terminate key */
 933         temp[0] = '\0';
 934
 935         /* skip whitespace after operator */
 936         while (isspace(linepos[0]))
 937                 linepos++;
 938         if (linepos[0] == '\0')
 939                 return -1;
 940
 941         /* get the value */
 942         if (linepos[0] == '"')
 943                 linepos++;
 944         else
 945                 return -1;
 946         *value = linepos;
 947
 948         /* terminate */
 949         temp = strchr(linepos, '"');
 950         if (!temp)
 951                 return -1;
 952         temp[0] = '\0';
 953         temp++;
 954         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 955
 956         /* move line to next key */
 957         *line = temp;
 958         return 0;
 959 }
 960
 961 /* extract possible KEY{attr} */
 962 static char *get_key_attribute(struct udev *udev, char *str)
 963 {
 964         char *pos;
 965         char *attr;
 966
 967         attr = strchr(str, '{');
 968         if (attr != NULL) {
 969                 attr++;
 970                 pos = strchr(attr, '}');
 971                 if (pos == NULL) {
 972                         err(udev, "missing closing brace for format\n");
 973                         return NULL;
 974                 }
 975                 pos[0] = '\0';
 976                 dbg(udev, "attribute='%s'\n", attr);
 977                 return attr;
 978         }
 979         return NULL;
 980 }
 981
 982 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 983                         enum operation_type op,
 984                         const char *value, const void *data)
 985 {
 986         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 987         const char *attr = NULL;
 988
 989         memset(token, 0x00, sizeof(struct token));
 990
 991         switch (type) {
 992         case TK_M_ACTION:
 993         case TK_M_DEVPATH:
 994         case TK_M_KERNEL:
 995         case TK_M_SUBSYSTEM:
 996         case TK_M_DRIVER:
 997         case TK_M_WAITFOR:
 998         case TK_M_DEVLINK:
 999         case TK_M_NAME:
1000         case TK_M_KERNELS:
1001         case TK_M_SUBSYSTEMS:
1002         case TK_M_DRIVERS:
1003         case TK_M_PROGRAM:
1004         case TK_M_IMPORT_FILE:
1005         case TK_M_IMPORT_PROG:
1006         case TK_M_IMPORT_DB:
1007         case TK_M_IMPORT_PARENT:
1008         case TK_M_RESULT:
1009         case TK_A_OWNER:
1010         case TK_A_GROUP:
1011         case TK_A_MODE:
1012         case TK_A_NAME:
1013         case TK_A_GOTO:
1014         case TK_M_TAG:
1015         case TK_A_TAG:
1016                 token->key.value_off = add_string(rule_tmp->rules, value);
1017                 break;
1018         case TK_M_ENV:
1019         case TK_M_ATTR:
1020         case TK_M_ATTRS:
1021         case TK_A_ATTR:
1022         case TK_A_ENV:
1023                 attr = data;
1024                 token->key.value_off = add_string(rule_tmp->rules, value);
1025                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1026                 break;
1027         case TK_A_DEVLINK:
1028                 token->key.value_off = add_string(rule_tmp->rules, value);
1029                 token->key.devlink_unique = *(int *)data;
1030                 break;
1031         case TK_M_TEST:
1032                 token->key.value_off = add_string(rule_tmp->rules, value);
1033                 if (data != NULL)
1034                         token->key.mode = *(mode_t *)data;
1035                 break;
1036         case TK_A_STRING_ESCAPE_NONE:
1037         case TK_A_STRING_ESCAPE_REPLACE:
1038                 break;
1039         case TK_A_RUN:
1040                 token->key.value_off = add_string(rule_tmp->rules, value);
1041                 token->key.fail_on_error = *(int *)data;
1042                 break;
1043         case TK_A_INOTIFY_WATCH:
1044         case TK_A_DEVLINK_PRIO:
1045                 token->key.devlink_prio = *(int *)data;
1046                 break;
1047         case TK_A_OWNER_ID:
1048                 token->key.uid = *(uid_t *)data;
1049                 break;
1050         case TK_A_GROUP_ID:
1051                 token->key.gid = *(gid_t *)data;
1052                 break;
1053         case TK_A_MODE_ID:
1054                 token->key.mode = *(mode_t *)data;
1055                 break;
1056         case TK_A_EVENT_TIMEOUT:
1057                 token->key.event_timeout = *(int *)data;
1058                 break;
1059         case TK_RULE:
1060         case TK_M_PARENTS_MIN:
1061         case TK_M_PARENTS_MAX:
1062         case TK_M_MAX:
1063         case TK_END:
1064         case TK_UNSET:
1065                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1066                 return -1;
1067         }
1068
1069         if (value != NULL && type < TK_M_MAX) {
1070                 /* check if we need to split or call fnmatch() while matching rules */
1071                 enum string_glob_type glob;
1072                 int has_split;
1073                 int has_glob;
1074
1075                 has_split = (strchr(value, '|') != NULL);
1076                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1077                 if (has_split && has_glob) {
1078                         glob = GL_SPLIT_GLOB;
1079                 } else if (has_split) {
1080                         glob = GL_SPLIT;
1081                 } else if (has_glob) {
1082                         if (strcmp(value, "?*") == 0)
1083                                 glob = GL_SOMETHING;
1084                         else
1085                                 glob = GL_GLOB;
1086                 } else {
1087                         glob = GL_PLAIN;
1088                 }
1089                 token->key.glob = glob;
1090         }
1091
1092         if (value != NULL && type > TK_M_MAX) {
1093                 /* check if assigned value has substitution chars */
1094                 if (value[0] == '[')
1095                         token->key.subst = SB_SUBSYS;
1096                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1097                         token->key.subst = SB_FORMAT;
1098                 else
1099                         token->key.subst = SB_NONE;
1100         }
1101
1102         if (attr != NULL) {
1103                 /* check if property/attribut name has substitution chars */
1104                 if (attr[0] == '[')
1105                         token->key.attrsubst = SB_SUBSYS;
1106                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1107                         token->key.attrsubst = SB_FORMAT;
1108                 else
1109                         token->key.attrsubst = SB_NONE;
1110         }
1111
1112         token->key.type = type;
1113         token->key.op = op;
1114         rule_tmp->token_cur++;
1115         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1116                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1117                 return -1;
1118         }
1119         return 0;
1120 }
1121
1122 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1123 {
1124         unsigned int i;
1125         unsigned int start = 0;
1126         unsigned int end = rule_tmp->token_cur;
1127
1128         for (i = 0; i < rule_tmp->token_cur; i++) {
1129                 enum token_type next_val = TK_UNSET;
1130                 unsigned int next_idx = 0;
1131                 unsigned int j;
1132
1133                 /* find smallest value */
1134                 for (j = start; j < end; j++) {
1135                         if (rule_tmp->token[j].type == TK_UNSET)
1136                                 continue;
1137                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1138                                 next_val = rule_tmp->token[j].type;
1139                                 next_idx = j;
1140                         }
1141                 }
1142
1143                 /* add token and mark done */
1144                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1145                         return -1;
1146                 rule_tmp->token[next_idx].type = TK_UNSET;
1147
1148                 /* shrink range */
1149                 if (next_idx == start)
1150                         start++;
1151                 if (next_idx+1 == end)
1152                         end--;
1153         }
1154         return 0;
1155 }
1156
1157 static int add_rule(struct udev_rules *rules, char *line,
1158                     const char *filename, unsigned int filename_off, unsigned int lineno)
1159 {
1160         char *linepos;
1161         char *attr;
1162         struct rule_tmp rule_tmp;
1163         bool bus_warn = false;
1164         bool sysfs_warn = false;
1165         bool id_warn = false;
1166
1167         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1168         rule_tmp.rules = rules;
1169         rule_tmp.rule.type = TK_RULE;
1170         rule_tmp.rule.rule.filename_off = filename_off;
1171         rule_tmp.rule.rule.filename_line = lineno;
1172
1173         linepos = line;
1174         while (1) {
1175                 char *key;
1176                 char *value;
1177                 enum operation_type op;
1178
1179                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1180                         break;
1181
1182                 if (strcmp(key, "ACTION") == 0) {
1183                         if (op > OP_MATCH_MAX) {
1184                                 err(rules->udev, "invalid ACTION operation\n");
1185                                 goto invalid;
1186                         }
1187                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1188                         continue;
1189                 }
1190
1191                 if (strcmp(key, "DEVPATH") == 0) {
1192                         if (op > OP_MATCH_MAX) {
1193                                 err(rules->udev, "invalid DEVPATH operation\n");
1194                                 goto invalid;
1195                         }
1196                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1197                         continue;
1198                 }
1199
1200                 if (strcmp(key, "KERNEL") == 0) {
1201                         if (op > OP_MATCH_MAX) {
1202                                 err(rules->udev, "invalid KERNEL operation\n");
1203                                 goto invalid;
1204                         }
1205                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1206                         continue;
1207                 }
1208
1209                 if (strcmp(key, "SUBSYSTEM") == 0) {
1210                         if (op > OP_MATCH_MAX) {
1211                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1212                                 goto invalid;
1213                         }
1214                         /* bus, class, subsystem events should all be the same */
1215                         if (strcmp(value, "subsystem") == 0 ||
1216                             strcmp(value, "bus") == 0 ||
1217                             strcmp(value, "class") == 0) {
1218                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1219                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1220                                             "please fix it in %s:%u", value, filename, lineno);
1221                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1222                         } else
1223                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1224                         continue;
1225                 }
1226
1227                 if (strcmp(key, "DRIVER") == 0) {
1228                         if (op > OP_MATCH_MAX) {
1229                                 err(rules->udev, "invalid DRIVER operation\n");
1230                                 goto invalid;
1231                         }
1232                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1233                         continue;
1234                 }
1235
1236                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1237                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1238                         if (attr == NULL) {
1239                                 err(rules->udev, "error parsing ATTR attribute\n");
1240                                 goto invalid;
1241                         }
1242                         if (op < OP_MATCH_MAX) {
1243                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1244                         } else {
1245                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1246                         }
1247                         continue;
1248                 }
1249
1250                 if (strcmp(key, "KERNELS") == 0) {
1251                         if (op > OP_MATCH_MAX) {
1252                                 err(rules->udev, "invalid KERNELS operation\n");
1253                                 goto invalid;
1254                         }
1255                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1256                         continue;
1257                 }
1258
1259                 if (strcmp(key, "ID") == 0) {
1260                         if (!id_warn) {
1261                                 id_warn = true;
1262                                 err(rules->udev, "ID= will be removed in a future udev version, "
1263                                     "please use KERNEL= to match the event device, or KERNELS= "
1264                                     "to match a parent device, in %s:%u\n", filename, lineno);
1265                         }
1266                         if (op > OP_MATCH_MAX) {
1267                                 err(rules->udev, "invalid KERNELS operation\n");
1268                                 goto invalid;
1269                         }
1270                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1271                         continue;
1272                 }
1273
1274                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1275                         if (op > OP_MATCH_MAX) {
1276                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1277                                 goto invalid;
1278                         }
1279                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1280                         continue;
1281                 }
1282
1283                 if (strcmp(key, "BUS") == 0) {
1284                         if (!bus_warn) {
1285                                 bus_warn = true;
1286                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1287                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1288                                     "to match a parent device, in %s:%u\n", filename, lineno);
1289                         }
1290                         if (op > OP_MATCH_MAX) {
1291                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1292                                 goto invalid;
1293                         }
1294                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1295                         continue;
1296                 }
1297
1298                 if (strcmp(key, "DRIVERS") == 0) {
1299                         if (op > OP_MATCH_MAX) {
1300                                 err(rules->udev, "invalid DRIVERS operation\n");
1301                                 goto invalid;
1302                         }
1303                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1304                         continue;
1305                 }
1306
1307                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1308                         if (op > OP_MATCH_MAX) {
1309                                 err(rules->udev, "invalid ATTRS operation\n");
1310                                 goto invalid;
1311                         }
1312                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1313                         if (attr == NULL) {
1314                                 err(rules->udev, "error parsing ATTRS attribute\n");
1315                                 goto invalid;
1316                         }
1317                         if (strncmp(attr, "device/", 7) == 0)
1318                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1319                                     "please fix it in %s:%u", filename, lineno);
1320                         else if (strstr(attr, "../") != NULL)
1321                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1322                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1323                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1324                         continue;
1325                 }
1326
1327                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1328                         if (!sysfs_warn) {
1329                                 sysfs_warn = true;
1330                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1331                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1332                                     "to match a parent device, in %s:%u\n", filename, lineno);
1333                         }
1334                         if (op > OP_MATCH_MAX) {
1335                                 err(rules->udev, "invalid ATTRS operation\n");
1336                                 goto invalid;
1337                         }
1338                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1339                         if (attr == NULL) {
1340                                 err(rules->udev, "error parsing ATTRS attribute\n");
1341                                 goto invalid;
1342                         }
1343                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1344                         continue;
1345                 }
1346
1347                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1348                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1349                         if (attr == NULL) {
1350                                 err(rules->udev, "error parsing ENV attribute\n");
1351                                 goto invalid;
1352                         }
1353                         if (op < OP_MATCH_MAX) {
1354                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1355                                         goto invalid;
1356                         } else {
1357                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1358                                         goto invalid;
1359                         }
1360                         continue;
1361                 }
1362
1363                 if (strcmp(key, "TAG") == 0) {
1364                         if (op < OP_MATCH_MAX)
1365                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1366                         else
1367                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1368                         continue;
1369                 }
1370
1371                 if (strcmp(key, "PROGRAM") == 0) {
1372                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1373                         continue;
1374                 }
1375
1376                 if (strcmp(key, "RESULT") == 0) {
1377                         if (op > OP_MATCH_MAX) {
1378                                 err(rules->udev, "invalid RESULT operation\n");
1379                                 goto invalid;
1380                         }
1381                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1382                         continue;
1383                 }
1384
1385                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1386                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1387                         if (attr != NULL && strstr(attr, "program")) {
1388                                 dbg(rules->udev, "IMPORT will be executed\n");
1389                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1390                         } else if (attr != NULL && strstr(attr, "file")) {
1391                                 dbg(rules->udev, "IMPORT will be included as file\n");
1392                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1393                         } else if (attr != NULL && strstr(attr, "db")) {
1394                                 dbg(rules->udev, "IMPORT will include db values\n");
1395                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1396                         } else if (attr != NULL && strstr(attr, "parent")) {
1397                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1398                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1399                         } else {
1400                                 /* figure it out if it is executable */
1401                                 char file[UTIL_PATH_SIZE];
1402                                 char *pos;
1403                                 struct stat statbuf;
1404
1405                                 /* allow programs in /lib/udev called without the path */
1406                                 if (value[0] != '/')
1407                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1408                                 else
1409                                         util_strscpy(file, sizeof(file), value);
1410                                 pos = strchr(file, ' ');
1411                                 if (pos)
1412                                         pos[0] = '\0';
1413                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1414                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1415                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1416                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1417                                 } else {
1418                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1419                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1420                                 }
1421                         }
1422                         continue;
1423                 }
1424
1425                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1426                         mode_t mode = 0;
1427
1428                         if (op > OP_MATCH_MAX) {
1429                                 err(rules->udev, "invalid TEST operation\n");
1430                                 goto invalid;
1431                         }
1432                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1433                         if (attr != NULL) {
1434                                 mode = strtol(attr, NULL, 8);
1435                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1436                         } else {
1437                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1438                         }
1439                         continue;
1440                 }
1441
1442                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1443                         int flag = 0;
1444
1445                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1446                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1447                                 flag = 1;
1448                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1449                         continue;
1450                 }
1451
1452                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1453                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1454                         continue;
1455                 }
1456
1457                 if (strcmp(key, "LABEL") == 0) {
1458                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1459                         continue;
1460                 }
1461
1462                 if (strcmp(key, "GOTO") == 0) {
1463                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1464                         continue;
1465                 }
1466
1467                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1468                         if (op < OP_MATCH_MAX) {
1469                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1470                         } else {
1471                                 if (strcmp(value, "%k") == 0) {
1472                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1473                                             "please remove it from %s:%u\n", filename, lineno);
1474                                         continue;
1475                                 }
1476                                 if (value[0] == '\0') {
1477                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1478                                              "please remove it from %s:%u\n", filename, lineno);
1479                                         continue;
1480                                 }
1481                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1482                         }
1483                         rule_tmp.rule.rule.flags = 1;
1484                         continue;
1485                 }
1486
1487                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1488                         if (op < OP_MATCH_MAX) {
1489                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1490                         } else {
1491                                 int flag = 0;
1492
1493                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1494                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1495                                         flag = 1;
1496                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1497                         }
1498                         rule_tmp.rule.rule.flags = 1;
1499                         continue;
1500                 }
1501
1502                 if (strcmp(key, "OWNER") == 0) {
1503                         uid_t uid;
1504                         char *endptr;
1505
1506                         uid = strtoul(value, &endptr, 10);
1507                         if (endptr[0] == '\0') {
1508                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1509                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1510                                 uid = add_uid(rules, value);
1511                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1512                         } else if (rules->resolve_names >= 0) {
1513                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1514                         }
1515                         rule_tmp.rule.rule.flags = 1;
1516                         continue;
1517                 }
1518
1519                 if (strcmp(key, "GROUP") == 0) {
1520                         gid_t gid;
1521                         char *endptr;
1522
1523                         gid = strtoul(value, &endptr, 10);
1524                         if (endptr[0] == '\0') {
1525                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1526                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1527                                 gid = add_gid(rules, value);
1528                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1529                         } else if (rules->resolve_names >= 0) {
1530                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1531                         }
1532                         rule_tmp.rule.rule.flags = 1;
1533                         continue;
1534                 }
1535
1536                 if (strcmp(key, "MODE") == 0) {
1537                         mode_t mode;
1538                         char *endptr;
1539
1540                         mode = strtol(value, &endptr, 8);
1541                         if (endptr[0] == '\0')
1542                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1543                         else
1544                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1545                         rule_tmp.rule.rule.flags = 1;
1546                         continue;
1547                 }
1548
1549                 if (strcmp(key, "OPTIONS") == 0) {
1550                         const char *pos;
1551
1552                         pos = strstr(value, "link_priority=");
1553                         if (pos != NULL) {
1554                                 int prio = atoi(&pos[strlen("link_priority=")]);
1555
1556                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1557                                 dbg(rules->udev, "link priority=%i\n", prio);
1558                         }
1559                         pos = strstr(value, "event_timeout=");
1560                         if (pos != NULL) {
1561                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1562
1563                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1564                                 dbg(rules->udev, "event timeout=%i\n", tout);
1565                         }
1566                         pos = strstr(value, "string_escape=");
1567                         if (pos != NULL) {
1568                                 pos = &pos[strlen("string_escape=")];
1569                                 if (strncmp(pos, "none", strlen("none")) == 0)
1570                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1571                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1572                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1573                         }
1574                         pos = strstr(value, "nowatch");
1575                         if (pos != NULL) {
1576                                 const int off = 0;
1577
1578                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &off);
1579                                 dbg(rules->udev, "inotify watch of device disabled\n");
1580                         } else {
1581                                 pos = strstr(value, "watch");
1582                                 if (pos != NULL) {
1583                                         const int on = 1;
1584
1585                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &on);
1586                                         dbg(rules->udev, "inotify watch of device requested\n");
1587                                 }
1588                         }
1589                         continue;
1590                 }
1591                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1592         }
1593
1594         /* add rule token */
1595         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1596         if (add_token(rules, &rule_tmp.rule) != 0)
1597                 goto invalid;
1598
1599         /* add tokens to list, sorted by type */
1600         if (sort_token(rules, &rule_tmp) != 0)
1601                 goto invalid;
1602
1603         return 0;
1604 invalid:
1605         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1606         return -1;
1607 }
1608
1609 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1610 {
1611         FILE *f;
1612         unsigned int first_token;
1613         char line[UTIL_LINE_SIZE];
1614         int line_nr = 0;
1615         unsigned int i;
1616
1617         info(rules->udev, "reading '%s' as rules file\n", filename);
1618
1619         f = fopen(filename, "r");
1620         if (f == NULL)
1621                 return -1;
1622
1623         first_token = rules->token_cur;
1624
1625         while (fgets(line, sizeof(line), f) != NULL) {
1626                 char *key;
1627                 size_t len;
1628
1629                 /* skip whitespace */
1630                 line_nr++;
1631                 key = line;
1632                 while (isspace(key[0]))
1633                         key++;
1634
1635                 /* comment */
1636                 if (key[0] == '#')
1637                         continue;
1638
1639                 len = strlen(line);
1640                 if (len < 3)
1641                         continue;
1642
1643                 /* continue reading if backslash+newline is found */
1644                 while (line[len-2] == '\\') {
1645                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1646                                 break;
1647                         if (strlen(&line[len-2]) < 2)
1648                                 break;
1649                         line_nr++;
1650                         len = strlen(line);
1651                 }
1652
1653                 if (len+1 >= sizeof(line)) {
1654                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1655                         continue;
1656                 }
1657                 add_rule(rules, key, filename, filename_off, line_nr);
1658         }
1659         fclose(f);
1660
1661         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1662         for (i = first_token+1; i < rules->token_cur; i++) {
1663                 if (rules->tokens[i].type == TK_A_GOTO) {
1664                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1665                         unsigned int j;
1666
1667                         for (j = i+1; j < rules->token_cur; j++) {
1668                                 if (rules->tokens[j].type != TK_RULE)
1669                                         continue;
1670                                 if (rules->tokens[j].rule.label_off == 0)
1671                                         continue;
1672                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1673                                         continue;
1674                                 rules->tokens[i].key.rule_goto = j;
1675                                 break;
1676                         }
1677                         if (rules->tokens[i].key.rule_goto == 0)
1678                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1679                 }
1680         }
1681         return 0;
1682 }
1683
1684 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1685 {
1686         DIR *dir;
1687         char filename[UTIL_PATH_SIZE];
1688
1689         dbg(udev, "open directory '%s'\n", dirname);
1690         dir = opendir(dirname);
1691         if (dir == NULL) {
1692                 info(udev, "unable to open '%s': %m\n", dirname);
1693                 return -1;
1694         }
1695
1696         while (1) {
1697                 struct dirent *dent;
1698
1699                 dent = readdir(dir);
1700                 if (dent == NULL || dent->d_name[0] == '\0')
1701                         break;
1702
1703                 if (dent->d_name[0] == '.')
1704                         continue;
1705
1706                 /* look for file matching with specified suffix */
1707                 if (suffix != NULL) {
1708                         const char *ext;
1709
1710                         ext = strrchr(dent->d_name, '.');
1711                         if (ext == NULL)
1712                                 continue;
1713                         if (strcmp(ext, suffix) != 0)
1714                                 continue;
1715                 }
1716                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1717                 dbg(udev, "put file '%s' into list\n", filename);
1718                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1719         }
1720
1721         closedir(dir);
1722         return 0;
1723 }
1724
1725 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1726 {
1727         struct udev_rules *rules;
1728         struct stat statbuf;
1729         struct udev_list_node file_list;
1730         struct udev_list_entry *file_loop, *file_tmp;
1731         struct token end_token;
1732
1733         rules = malloc(sizeof(struct udev_rules));
1734         if (rules == NULL)
1735                 return NULL;
1736         memset(rules, 0x00, sizeof(struct udev_rules));
1737         rules->udev = udev;
1738         rules->resolve_names = resolve_names;
1739         udev_list_init(&file_list);
1740
1741         /* init token array and string buffer */
1742         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1743         if (rules->tokens == NULL)
1744                 return NULL;
1745         rules->token_max = PREALLOC_TOKEN;
1746
1747         rules->buf = malloc(PREALLOC_STRBUF);
1748         if (rules->buf == NULL)
1749                 return NULL;
1750         rules->buf_max = PREALLOC_STRBUF;
1751         /* offset 0 is always '\0' */
1752         rules->buf[0] = '\0';
1753         rules->buf_cur = 1;
1754         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1755             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1756
1757         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1758         if (rules->trie_nodes == NULL)
1759                 return NULL;
1760         rules->trie_nodes_max = PREALLOC_TRIE;
1761         /* offset 0 is the trie root, with an empty string */
1762         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1763         rules->trie_nodes_cur = 1;
1764
1765         if (udev_get_rules_path(udev) != NULL) {
1766                 /* custom rules location for testing */
1767                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1768         } else {
1769                 char filename[PATH_MAX];
1770                 struct udev_list_node sort_list;
1771                 struct udev_list_entry *sort_loop, *sort_tmp;
1772
1773                 /* read user/custom rules */
1774                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1775
1776                 /* read dynamic/temporary rules */
1777                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1778                 udev_list_init(&sort_list);
1779                 add_matching_files(udev, &sort_list, filename, ".rules");
1780
1781                 /* read default rules */
1782                 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1783
1784                 /* sort all rules files by basename into list of files */
1785                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1786                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1787                         const char *sort_base = strrchr(sort_name, '/');
1788
1789                         if (sort_base == NULL)
1790                                 continue;
1791                         /* sort entry into existing list */
1792                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1793                                 const char *file_name = udev_list_entry_get_name(file_loop);
1794                                 const char *file_base = strrchr(file_name, '/');
1795
1796                                 if (file_base == NULL)
1797                                         continue;
1798                                 if (strcmp(file_base, sort_base) == 0) {
1799                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1800                                              file_name, sort_name);
1801                                         udev_list_entry_delete(sort_loop);
1802                                         sort_loop = NULL;
1803                                         break;
1804                                 }
1805                                 if (strcmp(file_base, sort_base) > 0) {
1806                                         /* found later file, insert before */
1807                                         udev_list_entry_remove(sort_loop);
1808                                         udev_list_entry_insert_before(sort_loop, file_loop);
1809                                         sort_loop = NULL;
1810                                         break;
1811                                 }
1812                         }
1813                         /* current file already handled */
1814                         if (sort_loop == NULL)
1815                                 continue;
1816                         /* no later file, append to end of list */
1817                         udev_list_entry_remove(sort_loop);
1818                         udev_list_entry_append(sort_loop, &file_list);
1819                 }
1820         }
1821
1822         /* add all filenames to the string buffer */
1823         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1824                 const char *filename = udev_list_entry_get_name(file_loop);
1825                 unsigned int filename_off;
1826
1827                 filename_off = add_string(rules, filename);
1828                 /* the offset in the rule is limited to unsigned short */
1829                 if (filename_off < USHRT_MAX)
1830                         udev_list_entry_set_flags(file_loop, filename_off);
1831         }
1832
1833         /* parse list of files */
1834         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1835                 const char *filename = udev_list_entry_get_name(file_loop);
1836                 unsigned int filename_off = udev_list_entry_get_flags(file_loop);
1837
1838                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1839                         parse_file(rules, filename, filename_off);
1840                 else
1841                         err(udev, "can not read '%s'\n", filename);
1842                 udev_list_entry_delete(file_loop);
1843         }
1844
1845         memset(&end_token, 0x00, sizeof(struct token));
1846         end_token.type = TK_END;
1847         add_token(rules, &end_token);
1848
1849         /* shrink allocated token and string buffer */
1850         if (rules->token_cur < rules->token_max) {
1851                 struct token *tokens;
1852
1853                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1854                 if (tokens != NULL || rules->token_cur == 0) {
1855                         rules->tokens = tokens;
1856                         rules->token_max = rules->token_cur;
1857                 }
1858         }
1859         if (rules->buf_cur < rules->buf_max) {
1860                 char *buf;
1861
1862                 buf = realloc(rules->buf, rules->buf_cur);
1863                 if (buf != NULL || rules->buf_cur == 0) {
1864                         rules->buf = buf;
1865                         rules->buf_max = rules->buf_cur;
1866                 }
1867         }
1868         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1869              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1870         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1871              rules->trie_nodes_cur * sizeof(struct trie_node),
1872              rules->trie_nodes_cur, sizeof(struct trie_node));
1873
1874         /* cleanup trie */
1875         free(rules->trie_nodes);
1876         rules->trie_nodes = NULL;
1877         rules->trie_nodes_cur = 0;
1878         rules->trie_nodes_max = 0;
1879
1880         /* cleanup uid/gid cache */
1881         free(rules->uids);
1882         rules->uids = NULL;
1883         rules->uids_cur = 0;
1884         rules->uids_max = 0;
1885         free(rules->gids);
1886         rules->gids = NULL;
1887         rules->gids_cur = 0;
1888         rules->gids_max = 0;
1889
1890         dump_rules(rules);
1891         return rules;
1892 }
1893
1894 void udev_rules_unref(struct udev_rules *rules)
1895 {
1896         if (rules == NULL)
1897                 return;
1898         free(rules->tokens);
1899         free(rules->buf);
1900         free(rules->trie_nodes);
1901         free(rules->uids);
1902         free(rules->gids);
1903         free(rules);
1904 }
1905
1906 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1907 {
1908         char *key_value = &rules->buf[token->key.value_off];
1909         char *pos;
1910         int match = 0;
1911
1912         if (val == NULL)
1913                 val = "";
1914
1915         switch (token->key.glob) {
1916         case GL_PLAIN:
1917                 match = (strcmp(key_value, val) == 0);
1918                 break;
1919         case GL_GLOB:
1920                 match = (fnmatch(key_value, val, 0) == 0);
1921                 break;
1922         case GL_SPLIT:
1923                 {
1924                         const char *split;
1925                         size_t len;
1926
1927                         split = &rules->buf[token->key.value_off];
1928                         len = strlen(val);
1929                         while (1) {
1930                                 const char *next;
1931
1932                                 next = strchr(split, '|');
1933                                 if (next != NULL) {
1934                                         size_t matchlen = (size_t)(next - split);
1935
1936                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1937                                         if (match)
1938                                                 break;
1939                                 } else {
1940                                         match = (strcmp(split, val) == 0);
1941                                         break;
1942                                 }
1943                                 split = &next[1];
1944                         }
1945                         break;
1946                 }
1947         case GL_SPLIT_GLOB:
1948                 {
1949                         char value[UTIL_PATH_SIZE];
1950
1951                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1952                         key_value = value;
1953                         while (key_value != NULL) {
1954                                 pos = strchr(key_value, '|');
1955                                 if (pos != NULL) {
1956                                         pos[0] = '\0';
1957                                         pos = &pos[1];
1958                                 }
1959                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1960                                 match = (fnmatch(key_value, val, 0) == 0);
1961                                 if (match)
1962                                         break;
1963                                 key_value = pos;
1964                         }
1965                         break;
1966                 }
1967         case GL_SOMETHING:
1968                 match = (val[0] != '\0');
1969                 break;
1970         case GL_UNSET:
1971                 return -1;
1972         }
1973
1974         if (match && (token->key.op == OP_MATCH)) {
1975                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1976                 return 0;
1977         }
1978         if (!match && (token->key.op == OP_NOMATCH)) {
1979                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1980                 return 0;
1981         }
1982         dbg(rules->udev, "%s is not true\n", token_str(token->type));
1983         return -1;
1984 }
1985
1986 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1987 {
1988         const char *name;
1989         char nbuf[UTIL_NAME_SIZE];
1990         const char *value;
1991         char vbuf[UTIL_NAME_SIZE];
1992         size_t len;
1993
1994         name = &rules->buf[cur->key.attr_off];
1995         switch (cur->key.attrsubst) {
1996         case SB_FORMAT:
1997                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1998                 name = nbuf;
1999                 /* fall through */
2000         case SB_NONE:
2001                 value = udev_device_get_sysattr_value(dev, name);
2002                 if (value == NULL)
2003                         return -1;
2004                 break;
2005         case SB_SUBSYS:
2006                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2007                         return -1;
2008                 value = vbuf;
2009                 break;
2010         default:
2011                 return -1;
2012         }
2013
2014         /* remove trailing whitespace, if not asked to match for it */
2015         len = strlen(value);
2016         if (len > 0 && isspace(value[len-1])) {
2017                 const char *key_value;
2018                 size_t klen;
2019
2020                 key_value = &rules->buf[cur->key.value_off];
2021                 klen = strlen(key_value);
2022                 if (klen > 0 && !isspace(key_value[klen-1])) {
2023                         if (value != vbuf) {
2024                                 util_strscpy(vbuf, sizeof(vbuf), value);
2025                                 value = vbuf;
2026                         }
2027                         while (len > 0 && isspace(vbuf[--len]))
2028                                 vbuf[len] = '\0';
2029                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2030                 }
2031         }
2032
2033         return match_key(rules, cur, value);
2034 }
2035
2036 enum escape_type {
2037         ESCAPE_UNSET,
2038         ESCAPE_NONE,
2039         ESCAPE_REPLACE,
2040 };
2041
2042 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2043 {
2044         struct token *cur;
2045         struct token *rule;
2046         enum escape_type esc = ESCAPE_UNSET;
2047         bool can_set_name;
2048
2049         if (rules->tokens == NULL)
2050                 return -1;
2051
2052         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2053                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2054                          strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
2055
2056         /* loop through token list, match, run actions or forward to next rule */
2057         cur = &rules->tokens[0];
2058         rule = cur;
2059         while (1) {
2060                 dump_token(rules, cur);
2061                 switch (cur->type) {
2062                 case TK_RULE:
2063                         /* current rule */
2064                         rule = cur;
2065                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2066                         if (!can_set_name && rule->rule.flags)
2067                                 goto nomatch;
2068                         esc = ESCAPE_UNSET;
2069                         break;
2070                 case TK_M_ACTION:
2071                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2072                                 goto nomatch;
2073                         break;
2074                 case TK_M_DEVPATH:
2075                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2076                                 goto nomatch;
2077                         break;
2078                 case TK_M_KERNEL:
2079                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2080                                 goto nomatch;
2081                         break;
2082                 case TK_M_DEVLINK:
2083                         {
2084                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2085                                 struct udev_list_entry *list_entry;
2086                                 int match = 0;
2087
2088                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2089                                         const char *devlink;
2090
2091                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2092                                         if (match_key(rules, cur, devlink) == 0) {
2093                                                 match = 1;
2094                                                 break;
2095                                         }
2096                                 }
2097                                 if (!match)
2098                                         goto nomatch;
2099                                 break;
2100                         }
2101                 case TK_M_NAME:
2102                         if (match_key(rules, cur, event->name) != 0)
2103                                 goto nomatch;
2104                         break;
2105                 case TK_M_ENV:
2106                         {
2107                                 const char *key_name = &rules->buf[cur->key.attr_off];
2108                                 const char *value;
2109
2110                                 value = udev_device_get_property_value(event->dev, key_name);
2111                                 if (value == NULL) {
2112                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2113                                         value = "";
2114                                 }
2115                                 if (match_key(rules, cur, value))
2116                                         goto nomatch;
2117                                 break;
2118                         }
2119                 case TK_M_TAG:
2120                         {
2121                                 struct udev_list_entry *list_entry;
2122                                 bool match = false;
2123
2124                                 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2125                                         if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2126                                                 match = true;
2127                                                 break;
2128                                         }
2129                                 }
2130                                 if (!match && (cur->key.op != OP_NOMATCH))
2131                                         goto nomatch;
2132                                 break;
2133                         }
2134                 case TK_M_SUBSYSTEM:
2135                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2136                                 goto nomatch;
2137                         break;
2138                 case TK_M_DRIVER:
2139                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2140                                 goto nomatch;
2141                         break;
2142                 case TK_M_WAITFOR:
2143                         {
2144                                 char filename[UTIL_PATH_SIZE];
2145                                 int found;
2146
2147                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2148                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2149                                 if (!found && (cur->key.op != OP_NOMATCH))
2150                                         goto nomatch;
2151                                 break;
2152                         }
2153                 case TK_M_ATTR:
2154                         if (match_attr(rules, event->dev, event, cur) != 0)
2155                                 goto nomatch;
2156                         break;
2157                 case TK_M_KERNELS:
2158                 case TK_M_SUBSYSTEMS:
2159                 case TK_M_DRIVERS:
2160                 case TK_M_ATTRS:
2161                         {
2162                                 struct token *next;
2163
2164                                 /* get whole sequence of parent matches */
2165                                 next = cur;
2166                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2167                                         next++;
2168
2169                                 /* loop over parents */
2170                                 event->dev_parent = event->dev;
2171                                 while (1) {
2172                                         struct token *key;
2173
2174                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2175                                         /* loop over sequence of parent match keys */
2176                                         for (key = cur; key < next; key++ ) {
2177                                                 dump_token(rules, key);
2178                                                 switch(key->type) {
2179                                                 case TK_M_KERNELS:
2180                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2181                                                                 goto try_parent;
2182                                                         break;
2183                                                 case TK_M_SUBSYSTEMS:
2184                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2185                                                                 goto try_parent;
2186                                                         break;
2187                                                 case TK_M_DRIVERS:
2188                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2189                                                                 goto try_parent;
2190                                                         break;
2191                                                 case TK_M_ATTRS:
2192                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2193                                                                 goto try_parent;
2194                                                         break;
2195                                                 default:
2196                                                         goto nomatch;
2197                                                 }
2198                                                 dbg(event->udev, "parent key matched\n");
2199                                         }
2200                                         dbg(event->udev, "all parent keys matched\n");
2201                                         /* all keys matched */
2202                                         break;
2203
2204                                 try_parent:
2205                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2206                                         if (event->dev_parent == NULL)
2207                                                 goto nomatch;
2208                                 }
2209                                 /* move behind our sequence of parent match keys */
2210                                 cur = next;
2211                                 continue;
2212                         }
2213                 case TK_M_TEST:
2214                         {
2215                                 char filename[UTIL_PATH_SIZE];
2216                                 struct stat statbuf;
2217                                 int match;
2218
2219                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2220                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2221                                         if (filename[0] != '/') {
2222                                                 char tmp[UTIL_PATH_SIZE];
2223
2224                                                 util_strscpy(tmp, sizeof(tmp), filename);
2225                                                 util_strscpyl(filename, sizeof(filename),
2226                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2227                                         }
2228                                 }
2229                                 attr_subst_subdir(filename, sizeof(filename));
2230
2231                                 match = (stat(filename, &statbuf) == 0);
2232                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2233                                 if (match && cur->key.mode > 0) {
2234                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2235                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2236                                             match ? "matches" : "does not match", cur->key.mode);
2237                                 }
2238                                 if (match && cur->key.op == OP_NOMATCH)
2239                                         goto nomatch;
2240                                 if (!match && cur->key.op == OP_MATCH)
2241                                         goto nomatch;
2242                                 break;
2243                         }
2244                 case TK_M_PROGRAM:
2245                         {
2246                                 char program[UTIL_PATH_SIZE];
2247                                 char **envp;
2248                                 char result[UTIL_PATH_SIZE];
2249
2250                                 free(event->program_result);
2251                                 event->program_result = NULL;
2252                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2253                                 envp = udev_device_get_properties_envp(event->dev);
2254                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2255                                      program,
2256                                      &rules->buf[rule->rule.filename_off],
2257                                      rule->rule.filename_line);
2258                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL, false) != 0) {
2259                                         if (cur->key.op != OP_NOMATCH)
2260                                                 goto nomatch;
2261                                 } else {
2262                                         int count;
2263
2264                                         util_remove_trailing_chars(result, '\n');
2265                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2266                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2267                                                 if (count > 0)
2268                                                         info(event->udev, "%i character(s) replaced\n" , count);
2269                                         }
2270                                         event->program_result = strdup(result);
2271                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2272                                         if (cur->key.op == OP_NOMATCH)
2273                                                 goto nomatch;
2274                                 }
2275                                 break;
2276                         }
2277                 case TK_M_IMPORT_FILE:
2278                         {
2279                                 char import[UTIL_PATH_SIZE];
2280
2281                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2282                                 if (import_file_into_properties(event->dev, import) != 0)
2283                                         if (cur->key.op != OP_NOMATCH)
2284                                                 goto nomatch;
2285                                 break;
2286                         }
2287                 case TK_M_IMPORT_PROG:
2288                         {
2289                                 char import[UTIL_PATH_SIZE];
2290
2291                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2292                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2293                                      import,
2294                                      &rules->buf[rule->rule.filename_off],
2295                                      rule->rule.filename_line);
2296                                 if (import_program_into_properties(event->dev, import) != 0)
2297                                         if (cur->key.op != OP_NOMATCH)
2298                                                 goto nomatch;
2299                                 break;
2300                         }
2301                 case TK_M_IMPORT_DB:
2302                         {
2303                                 const char *key = &rules->buf[cur->key.value_off];
2304                                 const char *value;
2305
2306                                 value = udev_device_get_property_value(event->dev_db, key);
2307                                 if (value != NULL) {
2308                                         struct udev_list_entry *entry;
2309
2310                                         entry = udev_device_add_property(event->dev, key, value);
2311                                         udev_list_entry_set_flags(entry, 1);
2312                                 } else {
2313                                         if (cur->key.op != OP_NOMATCH)
2314                                                 goto nomatch;
2315                                 }
2316                                 break;
2317                         }
2318                 case TK_M_IMPORT_PARENT:
2319                         {
2320                                 char import[UTIL_PATH_SIZE];
2321
2322                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2323                                 if (import_parent_into_properties(event->dev, import) != 0)
2324                                         if (cur->key.op != OP_NOMATCH)
2325                                                 goto nomatch;
2326                                 break;
2327                         }
2328                 case TK_M_RESULT:
2329                         if (match_key(rules, cur, event->program_result) != 0)
2330                                 goto nomatch;
2331                         break;
2332                 case TK_A_STRING_ESCAPE_NONE:
2333                         esc = ESCAPE_NONE;
2334                         break;
2335                 case TK_A_STRING_ESCAPE_REPLACE:
2336                         esc = ESCAPE_REPLACE;
2337                         break;
2338                 case TK_A_INOTIFY_WATCH:
2339                         event->inotify_watch = cur->key.watch;
2340                         break;
2341                 case TK_A_DEVLINK_PRIO:
2342                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2343                         break;
2344                 case TK_A_OWNER:
2345                         {
2346                                 char owner[UTIL_NAME_SIZE];
2347
2348                                 if (event->owner_final)
2349                                         break;
2350                                 if (cur->key.op == OP_ASSIGN_FINAL)
2351                                         event->owner_final = 1;
2352                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2353                                 event->uid = util_lookup_user(event->udev, owner);
2354                                 info(event->udev, "OWNER %u %s:%u\n",
2355                                      event->uid,
2356                                      &rules->buf[rule->rule.filename_off],
2357                                      rule->rule.filename_line);
2358                                 break;
2359                         }
2360                 case TK_A_GROUP:
2361                         {
2362                                 char group[UTIL_NAME_SIZE];
2363
2364                                 if (event->group_final)
2365                                         break;
2366                                 if (cur->key.op == OP_ASSIGN_FINAL)
2367                                         event->group_final = 1;
2368                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2369                                 event->gid = util_lookup_group(event->udev, group);
2370                                 info(event->udev, "GROUP %u %s:%u\n",
2371                                      event->gid,
2372                                      &rules->buf[rule->rule.filename_off],
2373                                      rule->rule.filename_line);
2374                                 break;
2375                         }
2376                 case TK_A_MODE:
2377                         {
2378                                 char mode[UTIL_NAME_SIZE];
2379                                 char *endptr;
2380
2381                                 if (event->mode_final)
2382                                         break;
2383                                 if (cur->key.op == OP_ASSIGN_FINAL)
2384                                         event->mode_final = 1;
2385                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2386                                 event->mode = strtol(mode, &endptr, 8);
2387                                 if (endptr[0] != '\0') {
2388                                         err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2389                                         event->mode = 0660;
2390                                 }
2391                                 info(event->udev, "MODE %#o %s:%u\n",
2392                                      event->mode,
2393                                      &rules->buf[rule->rule.filename_off],
2394                                      rule->rule.filename_line);
2395                                 break;
2396                         }
2397                 case TK_A_OWNER_ID:
2398                         if (event->owner_final)
2399                                 break;
2400                         if (cur->key.op == OP_ASSIGN_FINAL)
2401                                 event->owner_final = 1;
2402                         event->uid = cur->key.uid;
2403                         info(event->udev, "OWNER %u %s:%u\n",
2404                              event->uid,
2405                              &rules->buf[rule->rule.filename_off],
2406                              rule->rule.filename_line);
2407                         break;
2408                 case TK_A_GROUP_ID:
2409                         if (event->group_final)
2410                                 break;
2411                         if (cur->key.op == OP_ASSIGN_FINAL)
2412                                 event->group_final = 1;
2413                         event->gid = cur->key.gid;
2414                         info(event->udev, "GROUP %u %s:%u\n",
2415                              event->gid,
2416                              &rules->buf[rule->rule.filename_off],
2417                              rule->rule.filename_line);
2418                         break;
2419                 case TK_A_MODE_ID:
2420                         if (event->mode_final)
2421                                 break;
2422                         if (cur->key.op == OP_ASSIGN_FINAL)
2423                                 event->mode_final = 1;
2424                         event->mode = cur->key.mode;
2425                         info(event->udev, "MODE %#o %s:%u\n",
2426                              event->mode,
2427                              &rules->buf[rule->rule.filename_off],
2428                              rule->rule.filename_line);
2429                         break;
2430                 case TK_A_ENV:
2431                         {
2432                                 const char *name = &rules->buf[cur->key.attr_off];
2433                                 char *value = &rules->buf[cur->key.value_off];
2434
2435                                 if (value[0] != '\0') {
2436                                         char temp_value[UTIL_NAME_SIZE];
2437                                         struct udev_list_entry *entry;
2438
2439                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2440                                         entry = udev_device_add_property(event->dev, name, temp_value);
2441                                         /* store in db, skip private keys */
2442                                         if (name[0] != '.')
2443                                                 udev_list_entry_set_flags(entry, 1);
2444                                 } else {
2445                                         udev_device_add_property(event->dev, name, NULL);
2446                                 }
2447                                 break;
2448                         }
2449                 case TK_A_TAG:
2450                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2451                                 udev_device_cleanup_tags_list(event->dev);
2452                         udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
2453                         break;
2454                 case TK_A_NAME:
2455                         {
2456                                 const char *name  = &rules->buf[cur->key.value_off];
2457                                 char name_str[UTIL_PATH_SIZE];
2458                                 int count;
2459
2460                                 if (event->name_final)
2461                                         break;
2462                                 if (cur->key.op == OP_ASSIGN_FINAL)
2463                                         event->name_final = 1;
2464                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2465                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2466                                         count = udev_util_replace_chars(name_str, "/");
2467                                         if (count > 0)
2468                                                 info(event->udev, "%i character(s) replaced\n", count);
2469                                 }
2470                                 free(event->name);
2471                                 event->name = strdup(name_str);
2472                                 info(event->udev, "NAME '%s' %s:%u\n",
2473                                      event->name,
2474                                      &rules->buf[rule->rule.filename_off],
2475                                      rule->rule.filename_line);
2476                                 break;
2477                         }
2478                 case TK_A_DEVLINK:
2479                         {
2480                                 char temp[UTIL_PATH_SIZE];
2481                                 char filename[UTIL_PATH_SIZE];
2482                                 char *pos, *next;
2483                                 int count = 0;
2484
2485                                 if (event->devlink_final)
2486                                         break;
2487                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2488                                         break;
2489                                 if (cur->key.op == OP_ASSIGN_FINAL)
2490                                         event->devlink_final = 1;
2491                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2492                                         udev_device_cleanup_devlinks_list(event->dev);
2493
2494                                 /* allow  multiple symlinks separated by spaces */
2495                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2496                                 if (esc == ESCAPE_UNSET)
2497                                         count = udev_util_replace_chars(temp, "/ ");
2498                                 else if (esc == ESCAPE_REPLACE)
2499                                         count = udev_util_replace_chars(temp, "/");
2500                                 if (count > 0)
2501                                         info(event->udev, "%i character(s) replaced\n" , count);
2502                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2503                                 pos = temp;
2504                                 while (isspace(pos[0]))
2505                                         pos++;
2506                                 next = strchr(pos, ' ');
2507                                 while (next != NULL) {
2508                                         next[0] = '\0';
2509                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2510                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2511                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2512                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2513                                         while (isspace(next[1]))
2514                                                 next++;
2515                                         pos = &next[1];
2516                                         next = strchr(pos, ' ');
2517                                 }
2518                                 if (pos[0] != '\0') {
2519                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2520                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2521                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2522                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2523                                 }
2524                         }
2525                         break;
2526                 case TK_A_EVENT_TIMEOUT:
2527                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2528                         break;
2529                 case TK_A_ATTR:
2530                         {
2531                                 const char *key_name = &rules->buf[cur->key.attr_off];
2532                                 char attr[UTIL_PATH_SIZE];
2533                                 char value[UTIL_NAME_SIZE];
2534                                 FILE *f;
2535
2536                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2537                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2538                                 attr_subst_subdir(attr, sizeof(attr));
2539
2540                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2541                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2542                                      &rules->buf[rule->rule.filename_off],
2543                                      rule->rule.filename_line);
2544                                 f = fopen(attr, "w");
2545                                 if (f != NULL) {
2546                                         if (fprintf(f, "%s", value) <= 0)
2547                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2548                                         fclose(f);
2549                                 } else {
2550                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2551                                 }
2552                                 break;
2553                         }
2554                 case TK_A_RUN:
2555                         {
2556                                 struct udev_list_entry *list_entry;
2557
2558                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2559                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2560                                 info(event->udev, "RUN '%s' %s:%u\n",
2561                                      &rules->buf[cur->key.value_off],
2562                                      &rules->buf[rule->rule.filename_off],
2563                                      rule->rule.filename_line);
2564                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2565                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2566                                 if (cur->key.fail_on_error)
2567                                         udev_list_entry_set_flags(list_entry, 1);
2568                                 break;
2569                         }
2570                 case TK_A_GOTO:
2571                         if (cur->key.rule_goto == 0)
2572                                 break;
2573                         cur = &rules->tokens[cur->key.rule_goto];
2574                         continue;
2575                 case TK_END:
2576                         return 0;
2577
2578                 case TK_M_PARENTS_MIN:
2579                 case TK_M_PARENTS_MAX:
2580                 case TK_M_MAX:
2581                 case TK_UNSET:
2582                         err(rules->udev, "wrong type %u\n", cur->type);
2583                         goto nomatch;
2584                 }
2585
2586                 cur++;
2587                 continue;
2588         nomatch:
2589                 /* fast-forward to next rule */
2590                 cur = rule + rule->rule.token_count;
2591                 dbg(rules->udev, "forward to rule: %u\n",
2592                                  (unsigned int) (cur - rules->tokens));
2593         }
2594 }