src/udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN          2048
  36 #define PREALLOC_STRBUF         32 * 1024
  37 #define PREALLOC_TRIE           256
  38
  39 /* configuration directories with last modification timestamp */
  40 static const char *rules_dirs[] = {
  41         TEST_PREFIX UDEVLIBEXECDIR "/rules.d",
  42         TEST_PREFIX "/run/udev/rules.d",
  43         TEST_PREFIX SYSCONFDIR "/udev/rules.d",
  44 };
  45
  46 struct uid_gid {
  47         unsigned int name_off;
  48         union {
  49                 uid_t uid;
  50                 gid_t gid;
  51         };
  52 };
  53
  54 struct trie_node {
  55         /* this node's first child */
  56         unsigned int child_idx;
  57         /* the next child of our parent node's child list */
  58         unsigned int next_child_idx;
  59         /* this node's last child (shortcut for append) */
  60         unsigned int last_child_idx;
  61         unsigned int value_off;
  62         unsigned short value_len;
  63         unsigned char key;
  64 };
  65
  66 struct udev_rules {
  67         struct udev *udev;
  68         unsigned long long dirs_ts_usec[ELEMENTSOF(rules_dirs)];
  69         int resolve_names;
  70
  71         /* every key in the rules file becomes a token */
  72         struct token *tokens;
  73         unsigned int token_cur;
  74         unsigned int token_max;
  75
  76         /* all key strings are copied to a single string buffer */
  77         char *buf;
  78         size_t buf_cur;
  79         size_t buf_max;
  80         unsigned int buf_count;
  81
  82         /* during rule parsing, strings are indexed to find duplicates */
  83         struct trie_node *trie_nodes;
  84         unsigned int trie_nodes_cur;
  85         unsigned int trie_nodes_max;
  86
  87         /* during rule parsing, uid/gid lookup results are cached */
  88         struct uid_gid *uids;
  89         unsigned int uids_cur;
  90         unsigned int uids_max;
  91         struct uid_gid *gids;
  92         unsigned int gids_cur;
  93         unsigned int gids_max;
  94 };
  95
  96 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  97 enum operation_type {
  98         OP_UNSET,
  99
 100         OP_MATCH,
 101         OP_NOMATCH,
 102         OP_MATCH_MAX,
 103
 104         OP_ADD,
 105         OP_ASSIGN,
 106         OP_ASSIGN_FINAL,
 107 };
 108
 109 enum string_glob_type {
 110         GL_UNSET,
 111         GL_PLAIN,                       /* no special chars */
 112         GL_GLOB,                        /* shell globs ?,*,[] */
 113         GL_SPLIT,                       /* multi-value A|B */
 114         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 115         GL_SOMETHING,                   /* commonly used "?*" */
 116 };
 117
 118 enum string_subst_type {
 119         SB_UNSET,
 120         SB_NONE,
 121         SB_FORMAT,
 122         SB_SUBSYS,
 123 };
 124
 125 /* tokens of a rule are sorted/handled in this order */
 126 enum token_type {
 127         TK_UNSET,
 128         TK_RULE,
 129
 130         TK_M_ACTION,                    /* val */
 131         TK_M_DEVPATH,                   /* val */
 132         TK_M_KERNEL,                    /* val */
 133         TK_M_DEVLINK,                   /* val */
 134         TK_M_NAME,                      /* val */
 135         TK_M_ENV,                       /* val, attr */
 136         TK_M_TAG,                       /* val */
 137         TK_M_SUBSYSTEM,                 /* val */
 138         TK_M_DRIVER,                    /* val */
 139         TK_M_WAITFOR,                   /* val */
 140         TK_M_ATTR,                      /* val, attr */
 141
 142         TK_M_PARENTS_MIN,
 143         TK_M_KERNELS,                   /* val */
 144         TK_M_SUBSYSTEMS,                /* val */
 145         TK_M_DRIVERS,                   /* val */
 146         TK_M_ATTRS,                     /* val, attr */
 147         TK_M_TAGS,                      /* val */
 148         TK_M_PARENTS_MAX,
 149
 150         TK_M_TEST,                      /* val, mode_t */
 151         TK_M_EVENT_TIMEOUT,             /* int */
 152         TK_M_PROGRAM,                   /* val */
 153         TK_M_IMPORT_FILE,               /* val */
 154         TK_M_IMPORT_PROG,               /* val */
 155         TK_M_IMPORT_BUILTIN,            /* val */
 156         TK_M_IMPORT_DB,                 /* val */
 157         TK_M_IMPORT_CMDLINE,            /* val */
 158         TK_M_IMPORT_PARENT,             /* val */
 159         TK_M_RESULT,                    /* val */
 160         TK_M_MAX,
 161
 162         TK_A_STRING_ESCAPE_NONE,
 163         TK_A_STRING_ESCAPE_REPLACE,
 164         TK_A_DB_PERSIST,
 165         TK_A_INOTIFY_WATCH,             /* int */
 166         TK_A_DEVLINK_PRIO,              /* int */
 167         TK_A_OWNER,                     /* val */
 168         TK_A_GROUP,                     /* val */
 169         TK_A_MODE,                      /* val */
 170         TK_A_OWNER_ID,                  /* uid_t */
 171         TK_A_GROUP_ID,                  /* gid_t */
 172         TK_A_MODE_ID,                   /* mode_t */
 173         TK_A_STATIC_NODE,               /* val */
 174         TK_A_ENV,                       /* val, attr */
 175         TK_A_TAG,                       /* val */
 176         TK_A_NAME,                      /* val */
 177         TK_A_DEVLINK,                   /* val */
 178         TK_A_ATTR,                      /* val, attr */
 179         TK_A_RUN_BUILTIN,               /* val, bool */
 180         TK_A_RUN_PROGRAM,               /* val, bool */
 181         TK_A_GOTO,                      /* size_t */
 182
 183         TK_END,
 184 };
 185
 186 /* we try to pack stuff in a way that we take only 12 bytes per token */
 187 struct token {
 188         union {
 189                 unsigned char type;                /* same in rule and key */
 190                 struct {
 191                         enum token_type type:8;
 192                         bool can_set_name:1;
 193                         bool has_static_node:1;
 194                         unsigned int unused:6;
 195                         unsigned short token_count;
 196                         unsigned int label_off;
 197                         unsigned short filename_off;
 198                         unsigned short filename_line;
 199                 } rule;
 200                 struct {
 201                         enum token_type type:8;
 202                         enum operation_type op:8;
 203                         enum string_glob_type glob:8;
 204                         enum string_subst_type subst:4;
 205                         enum string_subst_type attrsubst:4;
 206                         unsigned int value_off;
 207                         union {
 208                                 unsigned int attr_off;
 209                                 int devlink_unique;
 210                                 unsigned int rule_goto;
 211                                 mode_t  mode;
 212                                 uid_t uid;
 213                                 gid_t gid;
 214                                 int devlink_prio;
 215                                 int event_timeout;
 216                                 int watch;
 217                                 enum udev_builtin_cmd builtin_cmd;
 218                         };
 219                 } key;
 220         };
 221 };
 222
 223 #define MAX_TK                64
 224 struct rule_tmp {
 225         struct udev_rules *rules;
 226         struct token rule;
 227         struct token token[MAX_TK];
 228         unsigned int token_cur;
 229 };
 230
 231 #ifdef DEBUG
 232 static const char *operation_str(enum operation_type type)
 233 {
 234         static const char *operation_strs[] = {
 235                 [OP_UNSET] =            "UNSET",
 236                 [OP_MATCH] =            "match",
 237                 [OP_NOMATCH] =          "nomatch",
 238                 [OP_MATCH_MAX] =        "MATCH_MAX",
 239
 240                 [OP_ADD] =              "add",
 241                 [OP_ASSIGN] =           "assign",
 242                 [OP_ASSIGN_FINAL] =     "assign-final",
 243 }        ;
 244
 245         return operation_strs[type];
 246 }
 247
 248 static const char *string_glob_str(enum string_glob_type type)
 249 {
 250         static const char *string_glob_strs[] = {
 251                 [GL_UNSET] =            "UNSET",
 252                 [GL_PLAIN] =            "plain",
 253                 [GL_GLOB] =             "glob",
 254                 [GL_SPLIT] =            "split",
 255                 [GL_SPLIT_GLOB] =       "split-glob",
 256                 [GL_SOMETHING] =        "split-glob",
 257         };
 258
 259         return string_glob_strs[type];
 260 }
 261
 262 static const char *token_str(enum token_type type)
 263 {
 264         static const char *token_strs[] = {
 265                 [TK_UNSET] =                    "UNSET",
 266                 [TK_RULE] =                     "RULE",
 267
 268                 [TK_M_ACTION] =                 "M ACTION",
 269                 [TK_M_DEVPATH] =                "M DEVPATH",
 270                 [TK_M_KERNEL] =                 "M KERNEL",
 271                 [TK_M_DEVLINK] =                "M DEVLINK",
 272                 [TK_M_NAME] =                   "M NAME",
 273                 [TK_M_ENV] =                    "M ENV",
 274                 [TK_M_TAG] =                    "M TAG",
 275                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 276                 [TK_M_DRIVER] =                 "M DRIVER",
 277                 [TK_M_WAITFOR] =                "M WAITFOR",
 278                 [TK_M_ATTR] =                   "M ATTR",
 279
 280                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 281                 [TK_M_KERNELS] =                "M KERNELS",
 282                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 283                 [TK_M_DRIVERS] =                "M DRIVERS",
 284                 [TK_M_ATTRS] =                  "M ATTRS",
 285                 [TK_M_TAGS] =                   "M TAGS",
 286                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 287
 288                 [TK_M_TEST] =                   "M TEST",
 289                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 290                 [TK_M_PROGRAM] =                "M PROGRAM",
 291                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 292                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 293                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 294                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 295                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 296                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 297                 [TK_M_RESULT] =                 "M RESULT",
 298                 [TK_M_MAX] =                    "M MAX",
 299
 300                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 301                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 302                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 303                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 304                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 305                 [TK_A_OWNER] =                  "A OWNER",
 306                 [TK_A_GROUP] =                  "A GROUP",
 307                 [TK_A_MODE] =                   "A MODE",
 308                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 309                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 310                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 311                 [TK_A_MODE_ID] =                "A MODE_ID",
 312                 [TK_A_ENV] =                    "A ENV",
 313                 [TK_A_TAG] =                    "A ENV",
 314                 [TK_A_NAME] =                   "A NAME",
 315                 [TK_A_DEVLINK] =                "A DEVLINK",
 316                 [TK_A_ATTR] =                   "A ATTR",
 317                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 318                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 319                 [TK_A_GOTO] =                   "A GOTO",
 320
 321                 [TK_END] =                      "END",
 322         };
 323
 324         return token_strs[type];
 325 }
 326
 327 static void dump_token(struct udev_rules *rules, struct token *token)
 328 {
 329         enum token_type type = token->type;
 330         enum operation_type op = token->key.op;
 331         enum string_glob_type glob = token->key.glob;
 332         const char *value = &rules->buf[token->key.value_off];
 333         const char *attr = &rules->buf[token->key.attr_off];
 334
 335         switch (type) {
 336         case TK_RULE:
 337                 {
 338                         const char *tks_ptr = (char *)rules->tokens;
 339                         const char *tk_ptr = (char *)token;
 340                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 341
 342                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 343                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 344                                   idx, token->rule.token_count,
 345                                   &rules->buf[token->rule.label_off]);
 346                         break;
 347                 }
 348         case TK_M_ACTION:
 349         case TK_M_DEVPATH:
 350         case TK_M_KERNEL:
 351         case TK_M_SUBSYSTEM:
 352         case TK_M_DRIVER:
 353         case TK_M_WAITFOR:
 354         case TK_M_DEVLINK:
 355         case TK_M_NAME:
 356         case TK_M_KERNELS:
 357         case TK_M_SUBSYSTEMS:
 358         case TK_M_DRIVERS:
 359         case TK_M_TAGS:
 360         case TK_M_PROGRAM:
 361         case TK_M_IMPORT_FILE:
 362         case TK_M_IMPORT_PROG:
 363         case TK_M_IMPORT_DB:
 364         case TK_M_IMPORT_CMDLINE:
 365         case TK_M_IMPORT_PARENT:
 366         case TK_M_RESULT:
 367         case TK_A_NAME:
 368         case TK_A_DEVLINK:
 369         case TK_A_OWNER:
 370         case TK_A_GROUP:
 371         case TK_A_MODE:
 372         case TK_A_RUN_BUILTIN:
 373         case TK_A_RUN_PROGRAM:
 374                 log_debug("%s %s '%s'(%s)\n",
 375                           token_str(type), operation_str(op), value, string_glob_str(glob));
 376                 break;
 377         case TK_M_IMPORT_BUILTIN:
 378                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 379                 break;
 380         case TK_M_ATTR:
 381         case TK_M_ATTRS:
 382         case TK_M_ENV:
 383         case TK_A_ATTR:
 384         case TK_A_ENV:
 385                 log_debug("%s %s '%s' '%s'(%s)\n",
 386                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 387                 break;
 388         case TK_M_TAG:
 389         case TK_A_TAG:
 390                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 391                 break;
 392         case TK_A_STRING_ESCAPE_NONE:
 393         case TK_A_STRING_ESCAPE_REPLACE:
 394         case TK_A_DB_PERSIST:
 395                 log_debug("%s\n", token_str(type));
 396                 break;
 397         case TK_M_TEST:
 398                 log_debug("%s %s '%s'(%s) %#o\n",
 399                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 400                 break;
 401         case TK_A_INOTIFY_WATCH:
 402                 log_debug("%s %u\n", token_str(type), token->key.watch);
 403                 break;
 404         case TK_A_DEVLINK_PRIO:
 405                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 406                 break;
 407         case TK_A_OWNER_ID:
 408                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 409                 break;
 410         case TK_A_GROUP_ID:
 411                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 412                 break;
 413         case TK_A_MODE_ID:
 414                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 415                 break;
 416         case TK_A_STATIC_NODE:
 417                 log_debug("%s '%s'\n", token_str(type), value);
 418                 break;
 419         case TK_M_EVENT_TIMEOUT:
 420                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 421                 break;
 422         case TK_A_GOTO:
 423                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 424                 break;
 425         case TK_END:
 426                 log_debug("* %s\n", token_str(type));
 427                 break;
 428         case TK_M_PARENTS_MIN:
 429         case TK_M_PARENTS_MAX:
 430         case TK_M_MAX:
 431         case TK_UNSET:
 432                 log_debug("unknown type %u\n", type);
 433                 break;
 434         }
 435 }
 436
 437 static void dump_rules(struct udev_rules *rules)
 438 {
 439         unsigned int i;
 440
 441         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 442                   rules->token_cur,
 443                   rules->token_cur * sizeof(struct token),
 444                   rules->buf_count,
 445                   rules->buf_cur);
 446         for(i = 0; i < rules->token_cur; i++)
 447                 dump_token(rules, &rules->tokens[i]);
 448 }
 449 #else
 450 static inline const char *operation_str(enum operation_type type) { return NULL; }
 451 static inline const char *token_str(enum token_type type) { return NULL; }
 452 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 453 static inline void dump_rules(struct udev_rules *rules) {}
 454 #endif /* DEBUG */
 455
 456 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 457 {
 458         int off;
 459
 460         /* grow buffer if needed */
 461         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 462                 char *buf;
 463                 unsigned int add;
 464
 465                 /* double the buffer size */
 466                 add = rules->buf_max;
 467                 if (add < bytes * 8)
 468                         add = bytes * 8;
 469
 470                 buf = realloc(rules->buf, rules->buf_max + add);
 471                 if (buf == NULL)
 472                         return -1;
 473                 rules->buf = buf;
 474                 rules->buf_max += add;
 475         }
 476         off = rules->buf_cur;
 477         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 478         rules->buf_cur += bytes;
 479         rules->buf_count++;
 480         return off;
 481 }
 482
 483 static int add_string(struct udev_rules *rules, const char *str)
 484 {
 485         unsigned int node_idx;
 486         struct trie_node *new_node;
 487         unsigned int new_node_idx;
 488         unsigned char key;
 489         unsigned short len;
 490         unsigned int depth;
 491         unsigned int off;
 492         struct trie_node *parent;
 493
 494         /* walk trie, start from last character of str to find matching tails */
 495         len = strlen(str);
 496         key = str[len-1];
 497         node_idx = 0;
 498         for (depth = 0; depth <= len; depth++) {
 499                 struct trie_node *node;
 500                 unsigned int child_idx;
 501
 502                 node = &rules->trie_nodes[node_idx];
 503                 off = node->value_off + node->value_len - len;
 504
 505                 /* match against current node */
 506                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 507                         return off;
 508
 509                 /* lookup child node */
 510                 key = str[len - 1 - depth];
 511                 child_idx = node->child_idx;
 512                 while (child_idx > 0) {
 513                         struct trie_node *child;
 514
 515                         child = &rules->trie_nodes[child_idx];
 516                         if (child->key == key)
 517                                 break;
 518                         child_idx = child->next_child_idx;
 519                 }
 520                 if (child_idx == 0)
 521                         break;
 522                 node_idx = child_idx;
 523         }
 524
 525         /* string not found, add it */
 526         off = add_new_string(rules, str, len + 1);
 527
 528         /* grow trie nodes if needed */
 529         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 530                 struct trie_node *nodes;
 531                 unsigned int add;
 532
 533                 /* double the buffer size */
 534                 add = rules->trie_nodes_max;
 535                 if (add < 8)
 536                         add = 8;
 537
 538                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 539                 if (nodes == NULL)
 540                         return -1;
 541                 rules->trie_nodes = nodes;
 542                 rules->trie_nodes_max += add;
 543         }
 544
 545         /* get a new node */
 546         new_node_idx = rules->trie_nodes_cur;
 547         rules->trie_nodes_cur++;
 548         new_node = &rules->trie_nodes[new_node_idx];
 549         memset(new_node, 0x00, sizeof(struct trie_node));
 550         new_node->value_off = off;
 551         new_node->value_len = len;
 552         new_node->key = key;
 553
 554         /* join the parent's child list */
 555         parent = &rules->trie_nodes[node_idx];
 556         if (parent->child_idx == 0) {
 557                 parent->child_idx = new_node_idx;
 558         } else {
 559                 struct trie_node *last_child;
 560
 561                 last_child = &rules->trie_nodes[parent->last_child_idx];
 562                 last_child->next_child_idx = new_node_idx;
 563         }
 564         parent->last_child_idx = new_node_idx;
 565         return off;
 566 }
 567
 568 static int add_token(struct udev_rules *rules, struct token *token)
 569 {
 570         /* grow buffer if needed */
 571         if (rules->token_cur+1 >= rules->token_max) {
 572                 struct token *tokens;
 573                 unsigned int add;
 574
 575                 /* double the buffer size */
 576                 add = rules->token_max;
 577                 if (add < 8)
 578                         add = 8;
 579
 580                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 581                 if (tokens == NULL)
 582                         return -1;
 583                 rules->tokens = tokens;
 584                 rules->token_max += add;
 585         }
 586         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 587         rules->token_cur++;
 588         return 0;
 589 }
 590
 591 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 592 {
 593         unsigned int i;
 594         uid_t uid;
 595         unsigned int off;
 596
 597         /* lookup, if we know it already */
 598         for (i = 0; i < rules->uids_cur; i++) {
 599                 off = rules->uids[i].name_off;
 600                 if (streq(&rules->buf[off], owner)) {
 601                         uid = rules->uids[i].uid;
 602                         return uid;
 603                 }
 604         }
 605         uid = util_lookup_user(rules->udev, owner);
 606
 607         /* grow buffer if needed */
 608         if (rules->uids_cur+1 >= rules->uids_max) {
 609                 struct uid_gid *uids;
 610                 unsigned int add;
 611
 612                 /* double the buffer size */
 613                 add = rules->uids_max;
 614                 if (add < 1)
 615                         add = 8;
 616
 617                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 618                 if (uids == NULL)
 619                         return uid;
 620                 rules->uids = uids;
 621                 rules->uids_max += add;
 622         }
 623         rules->uids[rules->uids_cur].uid = uid;
 624         off = add_string(rules, owner);
 625         if (off <= 0)
 626                 return uid;
 627         rules->uids[rules->uids_cur].name_off = off;
 628         rules->uids_cur++;
 629         return uid;
 630 }
 631
 632 static gid_t add_gid(struct udev_rules *rules, const char *group)
 633 {
 634         unsigned int i;
 635         gid_t gid;
 636         unsigned int off;
 637
 638         /* lookup, if we know it already */
 639         for (i = 0; i < rules->gids_cur; i++) {
 640                 off = rules->gids[i].name_off;
 641                 if (streq(&rules->buf[off], group)) {
 642                         gid = rules->gids[i].gid;
 643                         return gid;
 644                 }
 645         }
 646         gid = util_lookup_group(rules->udev, group);
 647
 648         /* grow buffer if needed */
 649         if (rules->gids_cur+1 >= rules->gids_max) {
 650                 struct uid_gid *gids;
 651                 unsigned int add;
 652
 653                 /* double the buffer size */
 654                 add = rules->gids_max;
 655                 if (add < 1)
 656                         add = 8;
 657
 658                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 659                 if (gids == NULL)
 660                         return gid;
 661                 rules->gids = gids;
 662                 rules->gids_max += add;
 663         }
 664         rules->gids[rules->gids_cur].gid = gid;
 665         off = add_string(rules, group);
 666         if (off <= 0)
 667                 return gid;
 668         rules->gids[rules->gids_cur].name_off = off;
 669         rules->gids_cur++;
 670         return gid;
 671 }
 672
 673 static int import_property_from_string(struct udev_device *dev, char *line)
 674 {
 675         char *key;
 676         char *val;
 677         size_t len;
 678
 679         /* find key */
 680         key = line;
 681         while (isspace(key[0]))
 682                 key++;
 683
 684         /* comment or empty line */
 685         if (key[0] == '#' || key[0] == '\0')
 686                 return -1;
 687
 688         /* split key/value */
 689         val = strchr(key, '=');
 690         if (val == NULL)
 691                 return -1;
 692         val[0] = '\0';
 693         val++;
 694
 695         /* find value */
 696         while (isspace(val[0]))
 697                 val++;
 698
 699         /* terminate key */
 700         len = strlen(key);
 701         if (len == 0)
 702                 return -1;
 703         while (isspace(key[len-1]))
 704                 len--;
 705         key[len] = '\0';
 706
 707         /* terminate value */
 708         len = strlen(val);
 709         if (len == 0)
 710                 return -1;
 711         while (isspace(val[len-1]))
 712                 len--;
 713         val[len] = '\0';
 714
 715         if (len == 0)
 716                 return -1;
 717
 718         /* unquote */
 719         if (val[0] == '"' || val[0] == '\'') {
 720                 if (val[len-1] != val[0]) {
 721                         log_debug("inconsistent quoting: '%s', skip\n", line);
 722                         return -1;
 723                 }
 724                 val[len-1] = '\0';
 725                 val++;
 726         }
 727
 728         /* handle device, renamed by external tool, returning new path */
 729         if (streq(key, "DEVPATH")) {
 730                 char syspath[UTIL_PATH_SIZE];
 731
 732                 log_debug("updating devpath from '%s' to '%s'\n",
 733                           udev_device_get_devpath(dev), val);
 734                 util_strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
 735                 udev_device_set_syspath(dev, syspath);
 736         } else {
 737                 struct udev_list_entry *entry;
 738
 739                 entry = udev_device_add_property(dev, key, val);
 740                 /* store in db, skip private keys */
 741                 if (key[0] != '.')
 742                         udev_list_entry_set_num(entry, true);
 743         }
 744         return 0;
 745 }
 746
 747 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 748 {
 749         FILE *f;
 750         char line[UTIL_LINE_SIZE];
 751
 752         f = fopen(filename, "r");
 753         if (f == NULL)
 754                 return -1;
 755         while (fgets(line, sizeof(line), f) != NULL)
 756                 import_property_from_string(dev, line);
 757         fclose(f);
 758         return 0;
 759 }
 760
 761 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 762 {
 763         struct udev_device *dev = event->dev;
 764         char **envp;
 765         char result[UTIL_LINE_SIZE];
 766         char *line;
 767         int err;
 768
 769         envp = udev_device_get_properties_envp(dev);
 770         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 771         if (err < 0)
 772                 return err;
 773
 774         line = result;
 775         while (line != NULL) {
 776                 char *pos;
 777
 778                 pos = strchr(line, '\n');
 779                 if (pos != NULL) {
 780                         pos[0] = '\0';
 781                         pos = &pos[1];
 782                 }
 783                 import_property_from_string(dev, line);
 784                 line = pos;
 785         }
 786         return 0;
 787 }
 788
 789 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 790 {
 791         struct udev_device *dev_parent;
 792         struct udev_list_entry *list_entry;
 793
 794         dev_parent = udev_device_get_parent(dev);
 795         if (dev_parent == NULL)
 796                 return -1;
 797
 798         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 799                 const char *key = udev_list_entry_get_name(list_entry);
 800                 const char *val = udev_list_entry_get_value(list_entry);
 801
 802                 if (fnmatch(filter, key, 0) == 0) {
 803                         struct udev_list_entry *entry;
 804
 805                         entry = udev_device_add_property(dev, key, val);
 806                         /* store in db, skip private keys */
 807                         if (key[0] != '.')
 808                                 udev_list_entry_set_num(entry, true);
 809                 }
 810         }
 811         return 0;
 812 }
 813
 814 #define WAIT_LOOP_PER_SECOND                50
 815 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 816 {
 817         char filepath[UTIL_PATH_SIZE];
 818         char devicepath[UTIL_PATH_SIZE];
 819         struct stat stats;
 820         int loop = timeout * WAIT_LOOP_PER_SECOND;
 821
 822         /* a relative path is a device attribute */
 823         devicepath[0] = '\0';
 824         if (file[0] != '/') {
 825                 util_strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
 826                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 827                 file = filepath;
 828         }
 829
 830         while (--loop) {
 831                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 832
 833                 /* lookup file */
 834                 if (stat(file, &stats) == 0) {
 835                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 836                         return 0;
 837                 }
 838                 /* make sure, the device did not disappear in the meantime */
 839                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 840                         log_debug("device disappeared while waiting for '%s'\n", file);
 841                         return -2;
 842                 }
 843                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 844                 nanosleep(&duration, NULL);
 845         }
 846         log_debug("waiting for '%s' failed\n", file);
 847         return -1;
 848 }
 849
 850 static int attr_subst_subdir(char *attr, size_t len)
 851 {
 852         bool found = false;
 853
 854         if (strstr(attr, "/*/")) {
 855                 char *pos;
 856                 char dirname[UTIL_PATH_SIZE];
 857                 const char *tail;
 858                 DIR *dir;
 859
 860                 util_strscpy(dirname, sizeof(dirname), attr);
 861                 pos = strstr(dirname, "/*/");
 862                 if (pos == NULL)
 863                         return -1;
 864                 pos[0] = '\0';
 865                 tail = &pos[2];
 866                 dir = opendir(dirname);
 867                 if (dir != NULL) {
 868                         struct dirent *dent;
 869
 870                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 871                                 struct stat stats;
 872
 873                                 if (dent->d_name[0] == '.')
 874                                         continue;
 875                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 876                                 if (stat(attr, &stats) == 0) {
 877                                         found = true;
 878                                         break;
 879                                 }
 880                         }
 881                         closedir(dir);
 882                 }
 883         }
 884
 885         return found;
 886 }
 887
 888 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 889 {
 890         char *linepos;
 891         char *temp;
 892
 893         linepos = *line;
 894         if (linepos == NULL || linepos[0] == '\0')
 895                 return -1;
 896
 897         /* skip whitespace */
 898         while (isspace(linepos[0]) || linepos[0] == ',')
 899                 linepos++;
 900
 901         /* get the key */
 902         if (linepos[0] == '\0')
 903                 return -1;
 904         *key = linepos;
 905
 906         for (;;) {
 907                 linepos++;
 908                 if (linepos[0] == '\0')
 909                         return -1;
 910                 if (isspace(linepos[0]))
 911                         break;
 912                 if (linepos[0] == '=')
 913                         break;
 914                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 915                         if (linepos[1] == '=')
 916                                 break;
 917         }
 918
 919         /* remember end of key */
 920         temp = linepos;
 921
 922         /* skip whitespace after key */
 923         while (isspace(linepos[0]))
 924                 linepos++;
 925         if (linepos[0] == '\0')
 926                 return -1;
 927
 928         /* get operation type */
 929         if (linepos[0] == '=' && linepos[1] == '=') {
 930                 *op = OP_MATCH;
 931                 linepos += 2;
 932         } else if (linepos[0] == '!' && linepos[1] == '=') {
 933                 *op = OP_NOMATCH;
 934                 linepos += 2;
 935         } else if (linepos[0] == '+' && linepos[1] == '=') {
 936                 *op = OP_ADD;
 937                 linepos += 2;
 938         } else if (linepos[0] == '=') {
 939                 *op = OP_ASSIGN;
 940                 linepos++;
 941         } else if (linepos[0] == ':' && linepos[1] == '=') {
 942                 *op = OP_ASSIGN_FINAL;
 943                 linepos += 2;
 944         } else
 945                 return -1;
 946
 947         /* terminate key */
 948         temp[0] = '\0';
 949
 950         /* skip whitespace after operator */
 951         while (isspace(linepos[0]))
 952                 linepos++;
 953         if (linepos[0] == '\0')
 954                 return -1;
 955
 956         /* get the value */
 957         if (linepos[0] == '"')
 958                 linepos++;
 959         else
 960                 return -1;
 961         *value = linepos;
 962
 963         /* terminate */
 964         temp = strchr(linepos, '"');
 965         if (!temp)
 966                 return -1;
 967         temp[0] = '\0';
 968         temp++;
 969
 970         /* move line to next key */
 971         *line = temp;
 972         return 0;
 973 }
 974
 975 /* extract possible KEY{attr} */
 976 static const char *get_key_attribute(struct udev *udev, char *str)
 977 {
 978         char *pos;
 979         char *attr;
 980
 981         attr = strchr(str, '{');
 982         if (attr != NULL) {
 983                 attr++;
 984                 pos = strchr(attr, '}');
 985                 if (pos == NULL) {
 986                         log_error("missing closing brace for format\n");
 987                         return NULL;
 988                 }
 989                 pos[0] = '\0';
 990                 return attr;
 991         }
 992         return NULL;
 993 }
 994
 995 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 996                         enum operation_type op,
 997                         const char *value, const void *data)
 998 {
 999         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
1000         const char *attr = NULL;
1001
1002         memset(token, 0x00, sizeof(struct token));
1003
1004         switch (type) {
1005         case TK_M_ACTION:
1006         case TK_M_DEVPATH:
1007         case TK_M_KERNEL:
1008         case TK_M_SUBSYSTEM:
1009         case TK_M_DRIVER:
1010         case TK_M_WAITFOR:
1011         case TK_M_DEVLINK:
1012         case TK_M_NAME:
1013         case TK_M_KERNELS:
1014         case TK_M_SUBSYSTEMS:
1015         case TK_M_DRIVERS:
1016         case TK_M_TAGS:
1017         case TK_M_PROGRAM:
1018         case TK_M_IMPORT_FILE:
1019         case TK_M_IMPORT_PROG:
1020         case TK_M_IMPORT_DB:
1021         case TK_M_IMPORT_CMDLINE:
1022         case TK_M_IMPORT_PARENT:
1023         case TK_M_RESULT:
1024         case TK_A_OWNER:
1025         case TK_A_GROUP:
1026         case TK_A_MODE:
1027         case TK_A_NAME:
1028         case TK_A_GOTO:
1029         case TK_M_TAG:
1030         case TK_A_TAG:
1031                 token->key.value_off = add_string(rule_tmp->rules, value);
1032                 break;
1033         case TK_M_IMPORT_BUILTIN:
1034                 token->key.value_off = add_string(rule_tmp->rules, value);
1035                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1036                 break;
1037         case TK_M_ENV:
1038         case TK_M_ATTR:
1039         case TK_M_ATTRS:
1040         case TK_A_ATTR:
1041         case TK_A_ENV:
1042                 attr = data;
1043                 token->key.value_off = add_string(rule_tmp->rules, value);
1044                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1045                 break;
1046         case TK_A_DEVLINK:
1047                 token->key.value_off = add_string(rule_tmp->rules, value);
1048                 token->key.devlink_unique = *(int *)data;
1049                 break;
1050         case TK_M_TEST:
1051                 token->key.value_off = add_string(rule_tmp->rules, value);
1052                 if (data != NULL)
1053                         token->key.mode = *(mode_t *)data;
1054                 break;
1055         case TK_A_STRING_ESCAPE_NONE:
1056         case TK_A_STRING_ESCAPE_REPLACE:
1057         case TK_A_DB_PERSIST:
1058                 break;
1059         case TK_A_RUN_BUILTIN:
1060         case TK_A_RUN_PROGRAM:
1061                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1062                 token->key.value_off = add_string(rule_tmp->rules, value);
1063                 break;
1064         case TK_A_INOTIFY_WATCH:
1065         case TK_A_DEVLINK_PRIO:
1066                 token->key.devlink_prio = *(int *)data;
1067                 break;
1068         case TK_A_OWNER_ID:
1069                 token->key.uid = *(uid_t *)data;
1070                 break;
1071         case TK_A_GROUP_ID:
1072                 token->key.gid = *(gid_t *)data;
1073                 break;
1074         case TK_A_MODE_ID:
1075                 token->key.mode = *(mode_t *)data;
1076                 break;
1077         case TK_A_STATIC_NODE:
1078                 token->key.value_off = add_string(rule_tmp->rules, value);
1079                 break;
1080         case TK_M_EVENT_TIMEOUT:
1081                 token->key.event_timeout = *(int *)data;
1082                 break;
1083         case TK_RULE:
1084         case TK_M_PARENTS_MIN:
1085         case TK_M_PARENTS_MAX:
1086         case TK_M_MAX:
1087         case TK_END:
1088         case TK_UNSET:
1089                 log_error("wrong type %u\n", type);
1090                 return -1;
1091         }
1092
1093         if (value != NULL && type < TK_M_MAX) {
1094                 /* check if we need to split or call fnmatch() while matching rules */
1095                 enum string_glob_type glob;
1096                 int has_split;
1097                 int has_glob;
1098
1099                 has_split = (strchr(value, '|') != NULL);
1100                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1101                 if (has_split && has_glob) {
1102                         glob = GL_SPLIT_GLOB;
1103                 } else if (has_split) {
1104                         glob = GL_SPLIT;
1105                 } else if (has_glob) {
1106                         if (streq(value, "?*"))
1107                                 glob = GL_SOMETHING;
1108                         else
1109                                 glob = GL_GLOB;
1110                 } else {
1111                         glob = GL_PLAIN;
1112                 }
1113                 token->key.glob = glob;
1114         }
1115
1116         if (value != NULL && type > TK_M_MAX) {
1117                 /* check if assigned value has substitution chars */
1118                 if (value[0] == '[')
1119                         token->key.subst = SB_SUBSYS;
1120                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1121                         token->key.subst = SB_FORMAT;
1122                 else
1123                         token->key.subst = SB_NONE;
1124         }
1125
1126         if (attr != NULL) {
1127                 /* check if property/attribut name has substitution chars */
1128                 if (attr[0] == '[')
1129                         token->key.attrsubst = SB_SUBSYS;
1130                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1131                         token->key.attrsubst = SB_FORMAT;
1132                 else
1133                         token->key.attrsubst = SB_NONE;
1134         }
1135
1136         token->key.type = type;
1137         token->key.op = op;
1138         rule_tmp->token_cur++;
1139         if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1140                 log_error("temporary rule array too small\n");
1141                 return -1;
1142         }
1143         return 0;
1144 }
1145
1146 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1147 {
1148         unsigned int i;
1149         unsigned int start = 0;
1150         unsigned int end = rule_tmp->token_cur;
1151
1152         for (i = 0; i < rule_tmp->token_cur; i++) {
1153                 enum token_type next_val = TK_UNSET;
1154                 unsigned int next_idx = 0;
1155                 unsigned int j;
1156
1157                 /* find smallest value */
1158                 for (j = start; j < end; j++) {
1159                         if (rule_tmp->token[j].type == TK_UNSET)
1160                                 continue;
1161                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1162                                 next_val = rule_tmp->token[j].type;
1163                                 next_idx = j;
1164                         }
1165                 }
1166
1167                 /* add token and mark done */
1168                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1169                         return -1;
1170                 rule_tmp->token[next_idx].type = TK_UNSET;
1171
1172                 /* shrink range */
1173                 if (next_idx == start)
1174                         start++;
1175                 if (next_idx+1 == end)
1176                         end--;
1177         }
1178         return 0;
1179 }
1180
1181 static int add_rule(struct udev_rules *rules, char *line,
1182                     const char *filename, unsigned int filename_off, unsigned int lineno)
1183 {
1184         char *linepos;
1185         const char *attr;
1186         struct rule_tmp rule_tmp;
1187
1188         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1189         rule_tmp.rules = rules;
1190         rule_tmp.rule.type = TK_RULE;
1191         rule_tmp.rule.rule.filename_off = filename_off;
1192         rule_tmp.rule.rule.filename_line = lineno;
1193
1194         linepos = line;
1195         for (;;) {
1196                 char *key;
1197                 char *value;
1198                 enum operation_type op;
1199
1200                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1201                         break;
1202
1203                 if (streq(key, "ACTION")) {
1204                         if (op > OP_MATCH_MAX) {
1205                                 log_error("invalid ACTION operation\n");
1206                                 goto invalid;
1207                         }
1208                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1209                         continue;
1210                 }
1211
1212                 if (streq(key, "DEVPATH")) {
1213                         if (op > OP_MATCH_MAX) {
1214                                 log_error("invalid DEVPATH operation\n");
1215                                 goto invalid;
1216                         }
1217                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1218                         continue;
1219                 }
1220
1221                 if (streq(key, "KERNEL")) {
1222                         if (op > OP_MATCH_MAX) {
1223                                 log_error("invalid KERNEL operation\n");
1224                                 goto invalid;
1225                         }
1226                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1227                         continue;
1228                 }
1229
1230                 if (streq(key, "SUBSYSTEM")) {
1231                         if (op > OP_MATCH_MAX) {
1232                                 log_error("invalid SUBSYSTEM operation\n");
1233                                 goto invalid;
1234                         }
1235                         /* bus, class, subsystem events should all be the same */
1236                         if (streq(value, "subsystem") ||
1237                             streq(value, "bus") ||
1238                             streq(value, "class")) {
1239                                 if (streq(value, "bus") || streq(value, "class"))
1240                                         log_error("'%s' must be specified as 'subsystem' \n"
1241                                             "please fix it in %s:%u", value, filename, lineno);
1242                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1243                         } else
1244                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1245                         continue;
1246                 }
1247
1248                 if (streq(key, "DRIVER")) {
1249                         if (op > OP_MATCH_MAX) {
1250                                 log_error("invalid DRIVER operation\n");
1251                                 goto invalid;
1252                         }
1253                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1254                         continue;
1255                 }
1256
1257                 if (startswith(key, "ATTR{")) {
1258                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1259                         if (attr == NULL) {
1260                                 log_error("error parsing ATTR attribute\n");
1261                                 goto invalid;
1262                         }
1263                         if (op < OP_MATCH_MAX) {
1264                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1265                         } else {
1266                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1267                         }
1268                         continue;
1269                 }
1270
1271                 if (streq(key, "KERNELS")) {
1272                         if (op > OP_MATCH_MAX) {
1273                                 log_error("invalid KERNELS operation\n");
1274                                 goto invalid;
1275                         }
1276                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1277                         continue;
1278                 }
1279
1280                 if (streq(key, "SUBSYSTEMS")) {
1281                         if (op > OP_MATCH_MAX) {
1282                                 log_error("invalid SUBSYSTEMS operation\n");
1283                                 goto invalid;
1284                         }
1285                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1286                         continue;
1287                 }
1288
1289                 if (streq(key, "DRIVERS")) {
1290                         if (op > OP_MATCH_MAX) {
1291                                 log_error("invalid DRIVERS operation\n");
1292                                 goto invalid;
1293                         }
1294                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1295                         continue;
1296                 }
1297
1298                 if (startswith(key, "ATTRS{")) {
1299                         if (op > OP_MATCH_MAX) {
1300                                 log_error("invalid ATTRS operation\n");
1301                                 goto invalid;
1302                         }
1303                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1304                         if (attr == NULL) {
1305                                 log_error("error parsing ATTRS attribute\n");
1306                                 goto invalid;
1307                         }
1308                         if (startswith(attr, "device/"))
1309                                 log_error("the 'device' link may not be available in a future kernel, "
1310                                     "please fix it in %s:%u", filename, lineno);
1311                         else if (strstr(attr, "../") != NULL)
1312                                 log_error("do not reference parent sysfs directories directly, "
1313                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1314                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1315                         continue;
1316                 }
1317
1318                 if (streq(key, "TAGS")) {
1319                         if (op > OP_MATCH_MAX) {
1320                                 log_error("invalid TAGS operation\n");
1321                                 goto invalid;
1322                         }
1323                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1324                         continue;
1325                 }
1326
1327                 if (startswith(key, "ENV{")) {
1328                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1329                         if (attr == NULL) {
1330                                 log_error("error parsing ENV attribute\n");
1331                                 goto invalid;
1332                         }
1333                         if (op < OP_MATCH_MAX) {
1334                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1335                                         goto invalid;
1336                         } else {
1337                                 static const char *blacklist[] = {
1338                                         "ACTION",
1339                                         "SUBSYSTEM",
1340                                         "DEVTYPE",
1341                                         "MAJOR",
1342                                         "MINOR",
1343                                         "DRIVER",
1344                                         "IFINDEX",
1345                                         "DEVNAME",
1346                                         "DEVLINKS",
1347                                         "DEVPATH",
1348                                         "TAGS",
1349                                 };
1350                                 unsigned int i;
1351
1352                                 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1353                                         if (!streq(attr, blacklist[i]))
1354                                                 continue;
1355                                         log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1356                                         goto invalid;
1357                                 }
1358                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1359                                         goto invalid;
1360                         }
1361                         continue;
1362                 }
1363
1364                 if (streq(key, "TAG")) {
1365                         if (op < OP_MATCH_MAX)
1366                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1367                         else
1368                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1369                         continue;
1370                 }
1371
1372                 if (streq(key, "PROGRAM")) {
1373                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1374                         continue;
1375                 }
1376
1377                 if (streq(key, "RESULT")) {
1378                         if (op > OP_MATCH_MAX) {
1379                                 log_error("invalid RESULT operation\n");
1380                                 goto invalid;
1381                         }
1382                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1383                         continue;
1384                 }
1385
1386                 if (startswith(key, "IMPORT")) {
1387                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1388                         if (attr == NULL) {
1389                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1390                                 continue;
1391                         }
1392                         if (streq(attr, "program")) {
1393                                 /* find known built-in command */
1394                                 if (value[0] != '/') {
1395                                         enum udev_builtin_cmd cmd;
1396
1397                                         cmd = udev_builtin_lookup(value);
1398                                         if (cmd < UDEV_BUILTIN_MAX) {
1399                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1400                                                           value, filename, lineno);
1401                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1402                                                 continue;
1403                                         }
1404                                 }
1405                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1406                         } else if (streq(attr, "builtin")) {
1407                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1408
1409                                 if (cmd < UDEV_BUILTIN_MAX)
1410                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1411                                 else
1412                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1413                         } else if (streq(attr, "file")) {
1414                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1415                         } else if (streq(attr, "db")) {
1416                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1417                         } else if (streq(attr, "cmdline")) {
1418                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1419                         } else if (streq(attr, "parent")) {
1420                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1421                         } else
1422                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1423                         continue;
1424                 }
1425
1426                 if (startswith(key, "TEST")) {
1427                         mode_t mode = 0;
1428
1429                         if (op > OP_MATCH_MAX) {
1430                                 log_error("invalid TEST operation\n");
1431                                 goto invalid;
1432                         }
1433                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1434                         if (attr != NULL) {
1435                                 mode = strtol(attr, NULL, 8);
1436                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1437                         } else {
1438                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1439                         }
1440                         continue;
1441                 }
1442
1443                 if (startswith(key, "RUN")) {
1444                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1445                         if (attr == NULL)
1446                                 attr = "program";
1447
1448                         if (streq(attr, "builtin")) {
1449                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1450
1451                                 if (cmd < UDEV_BUILTIN_MAX)
1452                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1453                                 else
1454                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1455                         } else if (streq(attr, "program")) {
1456                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1457
1458                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1459                         } else {
1460                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1461                         }
1462
1463                         continue;
1464                 }
1465
1466                 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1467                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1468                         continue;
1469                 }
1470
1471                 if (streq(key, "LABEL")) {
1472                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1473                         continue;
1474                 }
1475
1476                 if (streq(key, "GOTO")) {
1477                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1478                         continue;
1479                 }
1480
1481                 if (startswith(key, "NAME")) {
1482                         if (op < OP_MATCH_MAX) {
1483                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1484                         } else {
1485                                 if (streq(value, "%k")) {
1486                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1487                                             "please remove it from %s:%u\n", filename, lineno);
1488                                         continue;
1489                                 }
1490                                 if (value[0] == '\0') {
1491                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1492                                                   "please remove it from %s:%u\n", filename, lineno);
1493                                         continue;
1494                                 }
1495                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1496                         }
1497                         rule_tmp.rule.rule.can_set_name = true;
1498                         continue;
1499                 }
1500
1501                 if (startswith(key, "SYMLINK")) {
1502                         if (op < OP_MATCH_MAX) {
1503                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1504                         } else {
1505                                 int flag = 0;
1506
1507                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1508                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1509                                         flag = 1;
1510                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1511                         }
1512                         rule_tmp.rule.rule.can_set_name = true;
1513                         continue;
1514                 }
1515
1516                 if (streq(key, "OWNER")) {
1517                         uid_t uid;
1518                         char *endptr;
1519
1520                         uid = strtoul(value, &endptr, 10);
1521                         if (endptr[0] == '\0') {
1522                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1523                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1524                                 uid = add_uid(rules, value);
1525                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1526                         } else if (rules->resolve_names >= 0) {
1527                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1528                         }
1529                         rule_tmp.rule.rule.can_set_name = true;
1530                         continue;
1531                 }
1532
1533                 if (streq(key, "GROUP")) {
1534                         gid_t gid;
1535                         char *endptr;
1536
1537                         gid = strtoul(value, &endptr, 10);
1538                         if (endptr[0] == '\0') {
1539                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1540                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1541                                 gid = add_gid(rules, value);
1542                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1543                         } else if (rules->resolve_names >= 0) {
1544                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1545                         }
1546                         rule_tmp.rule.rule.can_set_name = true;
1547                         continue;
1548                 }
1549
1550                 if (streq(key, "MODE")) {
1551                         mode_t mode;
1552                         char *endptr;
1553
1554                         mode = strtol(value, &endptr, 8);
1555                         if (endptr[0] == '\0')
1556                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1557                         else
1558                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1559                         rule_tmp.rule.rule.can_set_name = true;
1560                         continue;
1561                 }
1562
1563                 if (streq(key, "OPTIONS")) {
1564                         const char *pos;
1565
1566                         pos = strstr(value, "link_priority=");
1567                         if (pos != NULL) {
1568                                 int prio = atoi(&pos[strlen("link_priority=")]);
1569
1570                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1571                         }
1572
1573                         pos = strstr(value, "event_timeout=");
1574                         if (pos != NULL) {
1575                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1576
1577                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1578                         }
1579
1580                         pos = strstr(value, "string_escape=");
1581                         if (pos != NULL) {
1582                                 pos = &pos[strlen("string_escape=")];
1583                                 if (startswith(pos, "none"))
1584                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1585                                 else if (startswith(pos, "replace"))
1586                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1587                         }
1588
1589                         pos = strstr(value, "db_persist");
1590                         if (pos != NULL)
1591                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1592
1593                         pos = strstr(value, "nowatch");
1594                         if (pos != NULL) {
1595                                 const int off = 0;
1596
1597                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1598                         } else {
1599                                 pos = strstr(value, "watch");
1600                                 if (pos != NULL) {
1601                                         const int on = 1;
1602
1603                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1604                                 }
1605                         }
1606
1607                         pos = strstr(value, "static_node=");
1608                         if (pos != NULL) {
1609                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1610                                 rule_tmp.rule.rule.has_static_node = true;
1611                         }
1612
1613                         continue;
1614                 }
1615
1616                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1617                 goto invalid;
1618         }
1619
1620         /* add rule token */
1621         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1622         if (add_token(rules, &rule_tmp.rule) != 0)
1623                 goto invalid;
1624
1625         /* add tokens to list, sorted by type */
1626         if (sort_token(rules, &rule_tmp) != 0)
1627                 goto invalid;
1628
1629         return 0;
1630 invalid:
1631         log_error("invalid rule '%s:%u'\n", filename, lineno);
1632         return -1;
1633 }
1634
1635 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1636 {
1637         FILE *f;
1638         unsigned int first_token;
1639         char line[UTIL_LINE_SIZE];
1640         int line_nr = 0;
1641         unsigned int i;
1642
1643         log_debug("reading '%s' as rules file\n", filename);
1644
1645         f = fopen(filename, "r");
1646         if (f == NULL)
1647                 return -1;
1648
1649         first_token = rules->token_cur;
1650
1651         while (fgets(line, sizeof(line), f) != NULL) {
1652                 char *key;
1653                 size_t len;
1654
1655                 /* skip whitespace */
1656                 line_nr++;
1657                 key = line;
1658                 while (isspace(key[0]))
1659                         key++;
1660
1661                 /* comment */
1662                 if (key[0] == '#')
1663                         continue;
1664
1665                 len = strlen(line);
1666                 if (len < 3)
1667                         continue;
1668
1669                 /* continue reading if backslash+newline is found */
1670                 while (line[len-2] == '\\') {
1671                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1672                                 break;
1673                         if (strlen(&line[len-2]) < 2)
1674                                 break;
1675                         line_nr++;
1676                         len = strlen(line);
1677                 }
1678
1679                 if (len+1 >= sizeof(line)) {
1680                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1681                         continue;
1682                 }
1683                 add_rule(rules, key, filename, filename_off, line_nr);
1684         }
1685         fclose(f);
1686
1687         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1688         for (i = first_token+1; i < rules->token_cur; i++) {
1689                 if (rules->tokens[i].type == TK_A_GOTO) {
1690                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1691                         unsigned int j;
1692
1693                         for (j = i+1; j < rules->token_cur; j++) {
1694                                 if (rules->tokens[j].type != TK_RULE)
1695                                         continue;
1696                                 if (rules->tokens[j].rule.label_off == 0)
1697                                         continue;
1698                                 if (!streq(label, &rules->buf[rules->tokens[j].rule.label_off]))
1699                                         continue;
1700                                 rules->tokens[i].key.rule_goto = j;
1701                                 break;
1702                         }
1703                         if (rules->tokens[i].key.rule_goto == 0)
1704                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1705                 }
1706         }
1707         return 0;
1708 }
1709
1710 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1711 {
1712         DIR *dir;
1713         struct dirent *dent;
1714         char filename[UTIL_PATH_SIZE];
1715
1716         dir = opendir(dirname);
1717         if (dir == NULL) {
1718                 log_debug("unable to open '%s': %m\n", dirname);
1719                 return -1;
1720         }
1721
1722         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1723                 if (dent->d_name[0] == '.')
1724                         continue;
1725
1726                 /* look for file matching with specified suffix */
1727                 if (suffix != NULL) {
1728                         const char *ext;
1729
1730                         ext = strrchr(dent->d_name, '.');
1731                         if (ext == NULL)
1732                                 continue;
1733                         if (!streq(ext, suffix))
1734                                 continue;
1735                 }
1736                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1737                 /*
1738                  * the basename is the key, the filename the value
1739                  * identical basenames from different directories override each other
1740                  * entries are sorted after basename
1741                  */
1742                 udev_list_entry_add(file_list, dent->d_name, filename);
1743         }
1744
1745         closedir(dir);
1746         return 0;
1747 }
1748
1749 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1750 {
1751         struct udev_rules *rules;
1752         struct udev_list file_list;
1753         struct udev_list_entry *file_loop;
1754         struct token end_token;
1755         unsigned int i;
1756
1757         rules = calloc(1, sizeof(struct udev_rules));
1758         if (rules == NULL)
1759                 return NULL;
1760         rules->udev = udev;
1761         rules->resolve_names = resolve_names;
1762         udev_list_init(udev, &file_list, true);
1763
1764         /* init token array and string buffer */
1765         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1766         if (rules->tokens == NULL) {
1767                 free(rules);
1768                 return NULL;
1769         }
1770         rules->token_max = PREALLOC_TOKEN;
1771
1772         rules->buf = malloc(PREALLOC_STRBUF);
1773         if (rules->buf == NULL) {
1774                 free(rules->tokens);
1775                 free(rules);
1776                 return NULL;
1777         }
1778         rules->buf_max = PREALLOC_STRBUF;
1779         /* offset 0 is always '\0' */
1780         rules->buf[0] = '\0';
1781         rules->buf_cur = 1;
1782
1783         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1784         if (rules->trie_nodes == NULL) {
1785                 free(rules->buf);
1786                 free(rules->tokens);
1787                 free(rules);
1788                 return NULL;
1789         }
1790         rules->trie_nodes_max = PREALLOC_TRIE;
1791         /* offset 0 is the trie root, with an empty string */
1792         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1793         rules->trie_nodes_cur = 1;
1794
1795         for (i = 0; i < ELEMENTSOF(rules_dirs); i++)
1796                 add_matching_files(udev, &file_list, rules_dirs[i], ".rules");
1797
1798         /* add all filenames to the string buffer */
1799         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1800                 const char *filename = udev_list_entry_get_value(file_loop);
1801                 unsigned int filename_off;
1802
1803                 filename_off = add_string(rules, filename);
1804                 /* the offset in the rule is limited to unsigned short */
1805                 if (filename_off < USHRT_MAX)
1806                         udev_list_entry_set_num(file_loop, filename_off);
1807         }
1808
1809         /* parse all rules files */
1810         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1811                 const char *filename = udev_list_entry_get_value(file_loop);
1812                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1813                 struct stat st;
1814
1815                 if (stat(filename, &st) != 0) {
1816                         log_error("can not find '%s': %m\n", filename);
1817                         continue;
1818                 }
1819                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1820                         log_debug("ignore empty '%s'\n", filename);
1821                         continue;
1822                 }
1823                 if (S_ISCHR(st.st_mode)) {
1824                         log_debug("ignore masked '%s'\n", filename);
1825                         continue;
1826                 }
1827                 parse_file(rules, filename, filename_off);
1828         }
1829         udev_list_cleanup(&file_list);
1830
1831         memset(&end_token, 0x00, sizeof(struct token));
1832         end_token.type = TK_END;
1833         add_token(rules, &end_token);
1834
1835         /* shrink allocated token and string buffer */
1836         if (rules->token_cur < rules->token_max) {
1837                 struct token *tokens;
1838
1839                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1840                 if (tokens != NULL || rules->token_cur == 0) {
1841                         rules->tokens = tokens;
1842                         rules->token_max = rules->token_cur;
1843                 }
1844         }
1845         if (rules->buf_cur < rules->buf_max) {
1846                 char *buf;
1847
1848                 buf = realloc(rules->buf, rules->buf_cur);
1849                 if (buf != NULL || rules->buf_cur == 0) {
1850                         rules->buf = buf;
1851                         rules->buf_max = rules->buf_cur;
1852                 }
1853         }
1854         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1855                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1856         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1857                   rules->trie_nodes_cur * sizeof(struct trie_node),
1858                   rules->trie_nodes_cur, sizeof(struct trie_node));
1859
1860         /* cleanup trie */
1861         free(rules->trie_nodes);
1862         rules->trie_nodes = NULL;
1863         rules->trie_nodes_cur = 0;
1864         rules->trie_nodes_max = 0;
1865
1866         /* cleanup uid/gid cache */
1867         free(rules->uids);
1868         rules->uids = NULL;
1869         rules->uids_cur = 0;
1870         rules->uids_max = 0;
1871         free(rules->gids);
1872         rules->gids = NULL;
1873         rules->gids_cur = 0;
1874         rules->gids_max = 0;
1875
1876         dump_rules(rules);
1877         return rules;
1878 }
1879
1880 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1881 {
1882         if (rules == NULL)
1883                 return NULL;
1884         free(rules->tokens);
1885         free(rules->buf);
1886         free(rules->trie_nodes);
1887         free(rules->uids);
1888         free(rules->gids);
1889         free(rules);
1890         return NULL;
1891 }
1892
1893 bool udev_rules_check_timestamp(struct udev_rules *rules)
1894 {
1895         unsigned int i;
1896         bool changed = false;
1897
1898         for (i = 0; i < ELEMENTSOF(rules_dirs); i++) {
1899                 struct stat stats;
1900
1901                 if (stat(rules_dirs[i], &stats) < 0)
1902                         continue;
1903
1904                 if (rules->dirs_ts_usec[i] == ts_usec(&stats.st_mtim))
1905                         continue;
1906
1907                 /* first check */
1908                 if (rules->dirs_ts_usec[i] != 0) {
1909                         log_debug("reload - timestamp of '%s' changed\n", rules_dirs[i]);
1910                         changed = true;
1911                 }
1912
1913                 /* update timestamp */
1914                 rules->dirs_ts_usec[i] = ts_usec(&stats.st_mtim);
1915         }
1916
1917         return changed;
1918 }
1919
1920 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1921 {
1922         char *key_value = &rules->buf[token->key.value_off];
1923         char *pos;
1924         bool match = false;
1925
1926         if (val == NULL)
1927                 val = "";
1928
1929         switch (token->key.glob) {
1930         case GL_PLAIN:
1931                 match = (streq(key_value, val));
1932                 break;
1933         case GL_GLOB:
1934                 match = (fnmatch(key_value, val, 0) == 0);
1935                 break;
1936         case GL_SPLIT:
1937                 {
1938                         const char *s;
1939                         size_t len;
1940
1941                         s = &rules->buf[token->key.value_off];
1942                         len = strlen(val);
1943                         for (;;) {
1944                                 const char *next;
1945
1946                                 next = strchr(s, '|');
1947                                 if (next != NULL) {
1948                                         size_t matchlen = (size_t)(next - s);
1949
1950                                         match = (matchlen == len && strncmp(s, val, matchlen) == 0);
1951                                         if (match)
1952                                                 break;
1953                                 } else {
1954                                         match = (streq(s, val));
1955                                         break;
1956                                 }
1957                                 s = &next[1];
1958                         }
1959                         break;
1960                 }
1961         case GL_SPLIT_GLOB:
1962                 {
1963                         char value[UTIL_PATH_SIZE];
1964
1965                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1966                         key_value = value;
1967                         while (key_value != NULL) {
1968                                 pos = strchr(key_value, '|');
1969                                 if (pos != NULL) {
1970                                         pos[0] = '\0';
1971                                         pos = &pos[1];
1972                                 }
1973                                 match = (fnmatch(key_value, val, 0) == 0);
1974                                 if (match)
1975                                         break;
1976                                 key_value = pos;
1977                         }
1978                         break;
1979                 }
1980         case GL_SOMETHING:
1981                 match = (val[0] != '\0');
1982                 break;
1983         case GL_UNSET:
1984                 return -1;
1985         }
1986
1987         if (match && (token->key.op == OP_MATCH))
1988                 return 0;
1989         if (!match && (token->key.op == OP_NOMATCH))
1990                 return 0;
1991         return -1;
1992 }
1993
1994 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1995 {
1996         const char *name;
1997         char nbuf[UTIL_NAME_SIZE];
1998         const char *value;
1999         char vbuf[UTIL_NAME_SIZE];
2000         size_t len;
2001
2002         name = &rules->buf[cur->key.attr_off];
2003         switch (cur->key.attrsubst) {
2004         case SB_FORMAT:
2005                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2006                 name = nbuf;
2007                 /* fall through */
2008         case SB_NONE:
2009                 value = udev_device_get_sysattr_value(dev, name);
2010                 if (value == NULL)
2011                         return -1;
2012                 break;
2013         case SB_SUBSYS:
2014                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2015                         return -1;
2016                 value = vbuf;
2017                 break;
2018         default:
2019                 return -1;
2020         }
2021
2022         /* remove trailing whitespace, if not asked to match for it */
2023         len = strlen(value);
2024         if (len > 0 && isspace(value[len-1])) {
2025                 const char *key_value;
2026                 size_t klen;
2027
2028                 key_value = &rules->buf[cur->key.value_off];
2029                 klen = strlen(key_value);
2030                 if (klen > 0 && !isspace(key_value[klen-1])) {
2031                         if (value != vbuf) {
2032                                 util_strscpy(vbuf, sizeof(vbuf), value);
2033                                 value = vbuf;
2034                         }
2035                         while (len > 0 && isspace(vbuf[--len]))
2036                                 vbuf[len] = '\0';
2037                 }
2038         }
2039
2040         return match_key(rules, cur, value);
2041 }
2042
2043 enum escape_type {
2044         ESCAPE_UNSET,
2045         ESCAPE_NONE,
2046         ESCAPE_REPLACE,
2047 };
2048
2049 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2050 {
2051         struct token *cur;
2052         struct token *rule;
2053         enum escape_type esc = ESCAPE_UNSET;
2054         bool can_set_name;
2055
2056         if (rules->tokens == NULL)
2057                 return -1;
2058
2059         can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
2060                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2061                          udev_device_get_ifindex(event->dev) > 0));
2062
2063         /* loop through token list, match, run actions or forward to next rule */
2064         cur = &rules->tokens[0];
2065         rule = cur;
2066         for (;;) {
2067                 dump_token(rules, cur);
2068                 switch (cur->type) {
2069                 case TK_RULE:
2070                         /* current rule */
2071                         rule = cur;
2072                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2073                         if (!can_set_name && rule->rule.can_set_name)
2074                                 goto nomatch;
2075                         esc = ESCAPE_UNSET;
2076                         break;
2077                 case TK_M_ACTION:
2078                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2079                                 goto nomatch;
2080                         break;
2081                 case TK_M_DEVPATH:
2082                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2083                                 goto nomatch;
2084                         break;
2085                 case TK_M_KERNEL:
2086                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2087                                 goto nomatch;
2088                         break;
2089                 case TK_M_DEVLINK: {
2090                         struct udev_list_entry *list_entry;
2091                         bool match = false;
2092
2093                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2094                                 const char *devlink;
2095
2096                                 devlink =  udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/");
2097                                 if (match_key(rules, cur, devlink) == 0) {
2098                                         match = true;
2099                                         break;
2100                                 }
2101                         }
2102                         if (!match)
2103                                 goto nomatch;
2104                         break;
2105                 }
2106                 case TK_M_NAME:
2107                         if (match_key(rules, cur, event->name) != 0)
2108                                 goto nomatch;
2109                         break;
2110                 case TK_M_ENV: {
2111                         const char *key_name = &rules->buf[cur->key.attr_off];
2112                         const char *value;
2113
2114                         value = udev_device_get_property_value(event->dev, key_name);
2115                         if (value == NULL)
2116                                 value = "";
2117                         if (match_key(rules, cur, value))
2118                                 goto nomatch;
2119                         break;
2120                 }
2121                 case TK_M_TAG: {
2122                         struct udev_list_entry *list_entry;
2123                         bool match = false;
2124
2125                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2126                                 if (streq(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry))) {
2127                                         match = true;
2128                                         break;
2129                                 }
2130                         }
2131                         if (!match && (cur->key.op != OP_NOMATCH))
2132                                 goto nomatch;
2133                         break;
2134                 }
2135                 case TK_M_SUBSYSTEM:
2136                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2137                                 goto nomatch;
2138                         break;
2139                 case TK_M_DRIVER:
2140                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2141                                 goto nomatch;
2142                         break;
2143                 case TK_M_WAITFOR: {
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                 case TK_M_TAGS: {
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                         for (;;) {
2172                                 struct token *key;
2173
2174                                 /* loop over sequence of parent match keys */
2175                                 for (key = cur; key < next; key++ ) {
2176                                         dump_token(rules, key);
2177                                         switch(key->type) {
2178                                         case TK_M_KERNELS:
2179                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2180                                                         goto try_parent;
2181                                                 break;
2182                                         case TK_M_SUBSYSTEMS:
2183                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2184                                                         goto try_parent;
2185                                                 break;
2186                                         case TK_M_DRIVERS:
2187                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2188                                                         goto try_parent;
2189                                                 break;
2190                                         case TK_M_ATTRS:
2191                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2192                                                         goto try_parent;
2193                                                 break;
2194                                         case TK_M_TAGS: {
2195                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2196
2197                                                 if (match && key->key.op == OP_NOMATCH)
2198                                                         goto try_parent;
2199                                                 if (!match && key->key.op == OP_MATCH)
2200                                                         goto try_parent;
2201                                                 break;
2202                                         }
2203                                         default:
2204                                                 goto nomatch;
2205                                         }
2206                                 }
2207                                 break;
2208
2209                         try_parent:
2210                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2211                                 if (event->dev_parent == NULL)
2212                                         goto nomatch;
2213                         }
2214                         /* move behind our sequence of parent match keys */
2215                         cur = next;
2216                         continue;
2217                 }
2218                 case TK_M_TEST: {
2219                         char filename[UTIL_PATH_SIZE];
2220                         struct stat statbuf;
2221                         int match;
2222
2223                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2224                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2225                                 if (filename[0] != '/') {
2226                                         char tmp[UTIL_PATH_SIZE];
2227
2228                                         util_strscpy(tmp, sizeof(tmp), filename);
2229                                         util_strscpyl(filename, sizeof(filename),
2230                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2231                                 }
2232                         }
2233                         attr_subst_subdir(filename, sizeof(filename));
2234
2235                         match = (stat(filename, &statbuf) == 0);
2236                         if (match && cur->key.mode > 0)
2237                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
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_EVENT_TIMEOUT:
2245                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2246                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2247                         break;
2248                 case TK_M_PROGRAM: {
2249                         char program[UTIL_PATH_SIZE];
2250                         char **envp;
2251                         char result[UTIL_PATH_SIZE];
2252
2253                         free(event->program_result);
2254                         event->program_result = NULL;
2255                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2256                         envp = udev_device_get_properties_envp(event->dev);
2257                         log_debug("PROGRAM '%s' %s:%u\n",
2258                                   program,
2259                                   &rules->buf[rule->rule.filename_off],
2260                                   rule->rule.filename_line);
2261
2262                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2263                                 if (cur->key.op != OP_NOMATCH)
2264                                         goto nomatch;
2265                         } else {
2266                                 int count;
2267
2268                                 util_remove_trailing_chars(result, '\n');
2269                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2270                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2271                                         if (count > 0)
2272                                                 log_debug("%i character(s) replaced\n" , count);
2273                                 }
2274                                 event->program_result = strdup(result);
2275                                 if (cur->key.op == OP_NOMATCH)
2276                                         goto nomatch;
2277                         }
2278                         break;
2279                 }
2280                 case TK_M_IMPORT_FILE: {
2281                         char import[UTIL_PATH_SIZE];
2282
2283                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2284                         if (import_file_into_properties(event->dev, import) != 0)
2285                                 if (cur->key.op != OP_NOMATCH)
2286                                         goto nomatch;
2287                         break;
2288                 }
2289                 case TK_M_IMPORT_PROG: {
2290                         char import[UTIL_PATH_SIZE];
2291
2292                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2293                         log_debug("IMPORT '%s' %s:%u\n",
2294                                   import,
2295                                   &rules->buf[rule->rule.filename_off],
2296                                   rule->rule.filename_line);
2297
2298                         if (import_program_into_properties(event, import, sigmask) != 0)
2299                                 if (cur->key.op != OP_NOMATCH)
2300                                         goto nomatch;
2301                         break;
2302                 }
2303                 case TK_M_IMPORT_BUILTIN: {
2304                         char command[UTIL_PATH_SIZE];
2305
2306                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2307                                 /* check if we ran already */
2308                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2309                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2310                                                   udev_builtin_name(cur->key.builtin_cmd),
2311                                                   &rules->buf[rule->rule.filename_off],
2312                                                   rule->rule.filename_line);
2313                                         /* return the result from earlier run */
2314                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2315                                         if (cur->key.op != OP_NOMATCH)
2316                                                         goto nomatch;
2317                                         break;
2318                                 }
2319                                 /* mark as ran */
2320                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2321                         }
2322
2323                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2324                         log_debug("IMPORT builtin '%s' %s:%u\n",
2325                                   udev_builtin_name(cur->key.builtin_cmd),
2326                                   &rules->buf[rule->rule.filename_off],
2327                                   rule->rule.filename_line);
2328
2329                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2330                                 /* remember failure */
2331                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2332                                           udev_builtin_name(cur->key.builtin_cmd));
2333                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2334                                 if (cur->key.op != OP_NOMATCH)
2335                                         goto nomatch;
2336                         }
2337                         break;
2338                 }
2339                 case TK_M_IMPORT_DB: {
2340                         const char *key = &rules->buf[cur->key.value_off];
2341                         const char *value;
2342
2343                         value = udev_device_get_property_value(event->dev_db, key);
2344                         if (value != NULL) {
2345                                 struct udev_list_entry *entry;
2346
2347                                 entry = udev_device_add_property(event->dev, key, value);
2348                                 udev_list_entry_set_num(entry, true);
2349                         } else {
2350                                 if (cur->key.op != OP_NOMATCH)
2351                                         goto nomatch;
2352                         }
2353                         break;
2354                 }
2355                 case TK_M_IMPORT_CMDLINE: {
2356                         FILE *f;
2357                         bool imported = false;
2358
2359                         f = fopen("/proc/cmdline", "r");
2360                         if (f != NULL) {
2361                                 char cmdline[4096];
2362
2363                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2364                                         const char *key = &rules->buf[cur->key.value_off];
2365                                         char *pos;
2366
2367                                         pos = strstr(cmdline, key);
2368                                         if (pos != NULL) {
2369                                                 struct udev_list_entry *entry;
2370
2371                                                 pos += strlen(key);
2372                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2373                                                         /* we import simple flags as 'FLAG=1' */
2374                                                         entry = udev_device_add_property(event->dev, key, "1");
2375                                                         udev_list_entry_set_num(entry, true);
2376                                                         imported = true;
2377                                                 } else if (pos[0] == '=') {
2378                                                         const char *value;
2379
2380                                                         pos++;
2381                                                         value = pos;
2382                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2383                                                                 pos++;
2384                                                         pos[0] = '\0';
2385                                                         entry = udev_device_add_property(event->dev, key, value);
2386                                                         udev_list_entry_set_num(entry, true);
2387                                                         imported = true;
2388                                                 }
2389                                         }
2390                                 }
2391                                 fclose(f);
2392                         }
2393                         if (!imported && cur->key.op != OP_NOMATCH)
2394                                 goto nomatch;
2395                         break;
2396                 }
2397                 case TK_M_IMPORT_PARENT: {
2398                         char import[UTIL_PATH_SIZE];
2399
2400                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2401                         if (import_parent_into_properties(event->dev, import) != 0)
2402                                 if (cur->key.op != OP_NOMATCH)
2403                                         goto nomatch;
2404                         break;
2405                 }
2406                 case TK_M_RESULT:
2407                         if (match_key(rules, cur, event->program_result) != 0)
2408                                 goto nomatch;
2409                         break;
2410                 case TK_A_STRING_ESCAPE_NONE:
2411                         esc = ESCAPE_NONE;
2412                         break;
2413                 case TK_A_STRING_ESCAPE_REPLACE:
2414                         esc = ESCAPE_REPLACE;
2415                         break;
2416                 case TK_A_DB_PERSIST:
2417                         udev_device_set_db_persist(event->dev);
2418                         break;
2419                 case TK_A_INOTIFY_WATCH:
2420                         if (event->inotify_watch_final)
2421                                 break;
2422                         if (cur->key.op == OP_ASSIGN_FINAL)
2423                                 event->inotify_watch_final = true;
2424                         event->inotify_watch = cur->key.watch;
2425                         break;
2426                 case TK_A_DEVLINK_PRIO:
2427                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2428                         break;
2429                 case TK_A_OWNER: {
2430                         char owner[UTIL_NAME_SIZE];
2431
2432                         if (event->owner_final)
2433                                 break;
2434                         if (cur->key.op == OP_ASSIGN_FINAL)
2435                                 event->owner_final = true;
2436                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2437                         event->uid = util_lookup_user(event->udev, owner);
2438                         log_debug("OWNER %u %s:%u\n",
2439                                   event->uid,
2440                                   &rules->buf[rule->rule.filename_off],
2441                                   rule->rule.filename_line);
2442                         break;
2443                 }
2444                 case TK_A_GROUP: {
2445                         char group[UTIL_NAME_SIZE];
2446
2447                         if (event->group_final)
2448                                 break;
2449                         if (cur->key.op == OP_ASSIGN_FINAL)
2450                                 event->group_final = true;
2451                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2452                         event->gid = util_lookup_group(event->udev, group);
2453                         log_debug("GROUP %u %s:%u\n",
2454                                   event->gid,
2455                                   &rules->buf[rule->rule.filename_off],
2456                                   rule->rule.filename_line);
2457                         break;
2458                 }
2459                 case TK_A_MODE: {
2460                         char mode_str[UTIL_NAME_SIZE];
2461                         mode_t mode;
2462                         char *endptr;
2463
2464                         if (event->mode_final)
2465                                 break;
2466                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2467                         mode = strtol(mode_str, &endptr, 8);
2468                         if (endptr[0] != '\0') {
2469                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2470                                 break;
2471                         }
2472                         if (cur->key.op == OP_ASSIGN_FINAL)
2473                                 event->mode_final = true;
2474                         event->mode_set = true;
2475                         event->mode = mode;
2476                         log_debug("MODE %#o %s:%u\n",
2477                                   event->mode,
2478                                   &rules->buf[rule->rule.filename_off],
2479                                   rule->rule.filename_line);
2480                         break;
2481                 }
2482                 case TK_A_OWNER_ID:
2483                         if (event->owner_final)
2484                                 break;
2485                         if (cur->key.op == OP_ASSIGN_FINAL)
2486                                 event->owner_final = true;
2487                         event->uid = cur->key.uid;
2488                         log_debug("OWNER %u %s:%u\n",
2489                                   event->uid,
2490                                   &rules->buf[rule->rule.filename_off],
2491                                   rule->rule.filename_line);
2492                         break;
2493                 case TK_A_GROUP_ID:
2494                         if (event->group_final)
2495                                 break;
2496                         if (cur->key.op == OP_ASSIGN_FINAL)
2497                                 event->group_final = true;
2498                         event->gid = cur->key.gid;
2499                         log_debug("GROUP %u %s:%u\n",
2500                                   event->gid,
2501                                   &rules->buf[rule->rule.filename_off],
2502                                   rule->rule.filename_line);
2503                         break;
2504                 case TK_A_MODE_ID:
2505                         if (event->mode_final)
2506                                 break;
2507                         if (cur->key.op == OP_ASSIGN_FINAL)
2508                                 event->mode_final = true;
2509                         event->mode_set = true;
2510                         event->mode = cur->key.mode;
2511                         log_debug("MODE %#o %s:%u\n",
2512                                   event->mode,
2513                                   &rules->buf[rule->rule.filename_off],
2514                                   rule->rule.filename_line);
2515                         break;
2516                 case TK_A_ENV: {
2517                         const char *name = &rules->buf[cur->key.attr_off];
2518                         char *value = &rules->buf[cur->key.value_off];
2519
2520                         if (value[0] != '\0') {
2521                                 char temp_value[UTIL_NAME_SIZE];
2522                                 struct udev_list_entry *entry;
2523
2524                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2525                                 entry = udev_device_add_property(event->dev, name, temp_value);
2526                                 /* store in db, skip private keys */
2527                                 if (name[0] != '.')
2528                                         udev_list_entry_set_num(entry, true);
2529                         } else {
2530                                 udev_device_add_property(event->dev, name, NULL);
2531                         }
2532                         break;
2533                 }
2534                 case TK_A_TAG: {
2535                         char tag[UTIL_PATH_SIZE];
2536                         const char *p;
2537
2538                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2539                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2540                                 udev_device_cleanup_tags_list(event->dev);
2541                         for (p = tag; *p != '\0'; p++) {
2542                                 if ((*p >= 'a' && *p <= 'z') ||
2543                                     (*p >= 'A' && *p <= 'Z') ||
2544                                     (*p >= '0' && *p <= '9') ||
2545                                     *p == '-' || *p == '_')
2546                                         continue;
2547                                 log_error("ignoring invalid tag name '%s'\n", tag);
2548                                 break;
2549                         }
2550                         udev_device_add_tag(event->dev, tag);
2551                         break;
2552                 }
2553                 case TK_A_NAME: {
2554                         const char *name  = &rules->buf[cur->key.value_off];
2555
2556                         char name_str[UTIL_PATH_SIZE];
2557                         int count;
2558
2559                         if (event->name_final)
2560                                 break;
2561                         if (cur->key.op == OP_ASSIGN_FINAL)
2562                                 event->name_final = true;
2563                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2564                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2565                                 count = util_replace_chars(name_str, "/");
2566                                 if (count > 0)
2567                                         log_debug("%i character(s) replaced\n", count);
2568                         }
2569                         if (major(udev_device_get_devnum(event->dev)) &&
2570                             (!streq(name_str, udev_device_get_devnode(event->dev) + strlen(TEST_PREFIX "/dev/")))) {
2571                                 log_error("NAME=\"%s\" ignored, kernel device nodes "
2572                                     "can not be renamed; please fix it in %s:%u\n", name,
2573                                     &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2574                                 break;
2575                         }
2576                         free(event->name);
2577                         event->name = strdup(name_str);
2578                         log_debug("NAME '%s' %s:%u\n",
2579                                   event->name,
2580                                   &rules->buf[rule->rule.filename_off],
2581                                   rule->rule.filename_line);
2582                         break;
2583                 }
2584                 case TK_A_DEVLINK: {
2585                         char temp[UTIL_PATH_SIZE];
2586                         char filename[UTIL_PATH_SIZE];
2587                         char *pos, *next;
2588                         int count = 0;
2589
2590                         if (event->devlink_final)
2591                                 break;
2592                         if (major(udev_device_get_devnum(event->dev)) == 0)
2593                                 break;
2594                         if (cur->key.op == OP_ASSIGN_FINAL)
2595                                 event->devlink_final = true;
2596                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2597                                 udev_device_cleanup_devlinks_list(event->dev);
2598
2599                         /* allow  multiple symlinks separated by spaces */
2600                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2601                         if (esc == ESCAPE_UNSET)
2602                                 count = util_replace_chars(temp, "/ ");
2603                         else if (esc == ESCAPE_REPLACE)
2604                                 count = util_replace_chars(temp, "/");
2605                         if (count > 0)
2606                                 log_debug("%i character(s) replaced\n" , count);
2607                         pos = temp;
2608                         while (isspace(pos[0]))
2609                                 pos++;
2610                         next = strchr(pos, ' ');
2611                         while (next != NULL) {
2612                                 next[0] = '\0';
2613                                 log_debug("LINK '%s' %s:%u\n", pos,
2614                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2615                                 util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", pos, NULL);
2616                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2617                                 while (isspace(next[1]))
2618                                         next++;
2619                                 pos = &next[1];
2620                                 next = strchr(pos, ' ');
2621                         }
2622                         if (pos[0] != '\0') {
2623                                 log_debug("LINK '%s' %s:%u\n", pos,
2624                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2625                                 util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", pos, NULL);
2626                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2627                         }
2628                         break;
2629                 }
2630                 case TK_A_ATTR: {
2631                         const char *key_name = &rules->buf[cur->key.attr_off];
2632                         char attr[UTIL_PATH_SIZE];
2633                         char value[UTIL_NAME_SIZE];
2634                         FILE *f;
2635
2636                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2637                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2638                         attr_subst_subdir(attr, sizeof(attr));
2639
2640                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2641                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2642                                   &rules->buf[rule->rule.filename_off],
2643                                   rule->rule.filename_line);
2644                         f = fopen(attr, "w");
2645                         if (f != NULL) {
2646                                 if (fprintf(f, "%s", value) <= 0)
2647                                         log_error("error writing ATTR{%s}: %m\n", attr);
2648                                 fclose(f);
2649                         } else {
2650                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2651                         }
2652                         break;
2653                 }
2654                 case TK_A_RUN_BUILTIN:
2655                 case TK_A_RUN_PROGRAM: {
2656                         struct udev_list_entry *entry;
2657
2658                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2659                                 udev_list_cleanup(&event->run_list);
2660                         log_debug("RUN '%s' %s:%u\n",
2661                                   &rules->buf[cur->key.value_off],
2662                                   &rules->buf[rule->rule.filename_off],
2663                                   rule->rule.filename_line);
2664                         entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2665                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2666                         break;
2667                 }
2668                 case TK_A_GOTO:
2669                         if (cur->key.rule_goto == 0)
2670                                 break;
2671                         cur = &rules->tokens[cur->key.rule_goto];
2672                         continue;
2673                 case TK_END:
2674                         return 0;
2675
2676                 case TK_M_PARENTS_MIN:
2677                 case TK_M_PARENTS_MAX:
2678                 case TK_M_MAX:
2679                 case TK_UNSET:
2680                         log_error("wrong type %u\n", cur->type);
2681                         goto nomatch;
2682                 }
2683
2684                 cur++;
2685                 continue;
2686         nomatch:
2687                 /* fast-forward to next rule */
2688                 cur = rule + rule->rule.token_count;
2689         }
2690 }
2691
2692 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2693 {
2694         struct token *cur;
2695         struct token *rule;
2696         uid_t uid = 0;
2697         gid_t gid = 0;
2698         mode_t mode = 0;
2699
2700         if (rules->tokens == NULL)
2701                 return;
2702
2703         cur = &rules->tokens[0];
2704         rule = cur;
2705         for (;;) {
2706                 switch (cur->type) {
2707                 case TK_RULE:
2708                         /* current rule */
2709                         rule = cur;
2710
2711                         /* skip rules without a static_node tag */
2712                         if (!rule->rule.has_static_node)
2713                                 goto next;
2714
2715                         uid = 0;
2716                         gid = 0;
2717                         mode = 0;
2718                         break;
2719                 case TK_A_OWNER_ID:
2720                         uid = cur->key.uid;
2721                         break;
2722                 case TK_A_GROUP_ID:
2723                         gid = cur->key.gid;
2724                         break;
2725                 case TK_A_MODE_ID:
2726                         mode = cur->key.mode;
2727                         break;
2728                 case TK_A_STATIC_NODE: {
2729                         char filename[UTIL_PATH_SIZE];
2730                         struct stat stats;
2731
2732                         /* we assure, that the permissions tokens are sorted before the static token */
2733                         if (mode == 0 && uid == 0 && gid == 0)
2734                                 goto next;
2735                         util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/",
2736                                       &rules->buf[cur->key.value_off], NULL);
2737                         if (stat(filename, &stats) != 0)
2738                                 goto next;
2739                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2740                                 goto next;
2741                         if (mode == 0) {
2742                                 if (gid > 0)
2743                                         mode = 0660;
2744                                 else
2745                                         mode = 0600;
2746                         }
2747                         if (mode != (stats.st_mode & 01777)) {
2748                                 chmod(filename, mode);
2749                                 log_debug("chmod '%s' %#o\n", filename, mode);
2750                         }
2751
2752                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2753                                 chown(filename, uid, gid);
2754                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2755                         }
2756
2757                         utimensat(AT_FDCWD, filename, NULL, 0);
2758                         break;
2759                 }
2760                 case TK_END:
2761                         return;
2762                 }
2763
2764                 cur++;
2765                 continue;
2766 next:
2767                 /* fast-forward to next rule */
2768                 cur = rule + rule->rule.token_count;
2769                 continue;
2770         }
2771 }