src/udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2012 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 #include "path-util.h"
  35 #include "conf-files.h"
  36
  37 #define PREALLOC_TOKEN          2048
  38 #define PREALLOC_STRBUF         32 * 1024
  39 #define PREALLOC_TRIE           256
  40
  41 struct uid_gid {
  42         unsigned int name_off;
  43         union {
  44                 uid_t uid;
  45                 gid_t gid;
  46         };
  47 };
  48
  49 struct trie_node {
  50         /* this node's first child */
  51         unsigned int child_idx;
  52         /* the next child of our parent node's child list */
  53         unsigned int next_child_idx;
  54         /* this node's last child (shortcut for append) */
  55         unsigned int last_child_idx;
  56         unsigned int value_off;
  57         unsigned short value_len;
  58         unsigned char key;
  59 };
  60
  61 struct udev_rules {
  62         struct udev *udev;
  63         char **dirs;
  64         unsigned long long *dirs_ts_usec;
  65         int resolve_names;
  66
  67         /* every key in the rules file becomes a token */
  68         struct token *tokens;
  69         unsigned int token_cur;
  70         unsigned int token_max;
  71
  72         /* all key strings are copied to a single string buffer */
  73         char *buf;
  74         size_t buf_cur;
  75         size_t buf_max;
  76         unsigned int buf_count;
  77
  78         /* during rule parsing, strings are indexed and de-duplicated */
  79         struct trie_node *trie_nodes;
  80         unsigned int trie_nodes_cur;
  81         unsigned int trie_nodes_max;
  82
  83         /* during rule parsing, uid/gid lookup results are cached */
  84         struct uid_gid *uids;
  85         unsigned int uids_cur;
  86         unsigned int uids_max;
  87         struct uid_gid *gids;
  88         unsigned int gids_cur;
  89         unsigned int gids_max;
  90 };
  91
  92 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  93 enum operation_type {
  94         OP_UNSET,
  95
  96         OP_MATCH,
  97         OP_NOMATCH,
  98         OP_MATCH_MAX,
  99
 100         OP_ADD,
 101         OP_ASSIGN,
 102         OP_ASSIGN_FINAL,
 103 };
 104
 105 enum string_glob_type {
 106         GL_UNSET,
 107         GL_PLAIN,                       /* no special chars */
 108         GL_GLOB,                        /* shell globs ?,*,[] */
 109         GL_SPLIT,                       /* multi-value A|B */
 110         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 111         GL_SOMETHING,                   /* commonly used "?*" */
 112 };
 113
 114 enum string_subst_type {
 115         SB_UNSET,
 116         SB_NONE,
 117         SB_FORMAT,
 118         SB_SUBSYS,
 119 };
 120
 121 /* tokens of a rule are sorted/handled in this order */
 122 enum token_type {
 123         TK_UNSET,
 124         TK_RULE,
 125
 126         TK_M_ACTION,                    /* val */
 127         TK_M_DEVPATH,                   /* val */
 128         TK_M_KERNEL,                    /* val */
 129         TK_M_DEVLINK,                   /* val */
 130         TK_M_NAME,                      /* val */
 131         TK_M_ENV,                       /* val, attr */
 132         TK_M_TAG,                       /* val */
 133         TK_M_SUBSYSTEM,                 /* val */
 134         TK_M_DRIVER,                    /* val */
 135         TK_M_WAITFOR,                   /* val */
 136         TK_M_ATTR,                      /* val, attr */
 137
 138         TK_M_PARENTS_MIN,
 139         TK_M_KERNELS,                   /* val */
 140         TK_M_SUBSYSTEMS,                /* val */
 141         TK_M_DRIVERS,                   /* val */
 142         TK_M_ATTRS,                     /* val, attr */
 143         TK_M_TAGS,                      /* val */
 144         TK_M_PARENTS_MAX,
 145
 146         TK_M_TEST,                      /* val, mode_t */
 147         TK_M_EVENT_TIMEOUT,             /* int */
 148         TK_M_PROGRAM,                   /* val */
 149         TK_M_IMPORT_FILE,               /* val */
 150         TK_M_IMPORT_PROG,               /* val */
 151         TK_M_IMPORT_BUILTIN,            /* val */
 152         TK_M_IMPORT_DB,                 /* val */
 153         TK_M_IMPORT_CMDLINE,            /* val */
 154         TK_M_IMPORT_PARENT,             /* val */
 155         TK_M_RESULT,                    /* val */
 156         TK_M_MAX,
 157
 158         TK_A_STRING_ESCAPE_NONE,
 159         TK_A_STRING_ESCAPE_REPLACE,
 160         TK_A_DB_PERSIST,
 161         TK_A_INOTIFY_WATCH,             /* int */
 162         TK_A_DEVLINK_PRIO,              /* int */
 163         TK_A_OWNER,                     /* val */
 164         TK_A_GROUP,                     /* val */
 165         TK_A_MODE,                      /* val */
 166         TK_A_OWNER_ID,                  /* uid_t */
 167         TK_A_GROUP_ID,                  /* gid_t */
 168         TK_A_MODE_ID,                   /* mode_t */
 169         TK_A_STATIC_NODE,               /* val */
 170         TK_A_ENV,                       /* val, attr */
 171         TK_A_TAG,                       /* val */
 172         TK_A_NAME,                      /* val */
 173         TK_A_DEVLINK,                   /* val */
 174         TK_A_ATTR,                      /* val, attr */
 175         TK_A_RUN_BUILTIN,               /* val, bool */
 176         TK_A_RUN_PROGRAM,               /* val, bool */
 177         TK_A_GOTO,                      /* size_t */
 178
 179         TK_END,
 180 };
 181
 182 /* we try to pack stuff in a way that we take only 12 bytes per token */
 183 struct token {
 184         union {
 185                 unsigned char type;                /* same in rule and key */
 186                 struct {
 187                         enum token_type type:8;
 188                         bool can_set_name:1;
 189                         bool has_static_node:1;
 190                         unsigned int unused:6;
 191                         unsigned short token_count;
 192                         unsigned int label_off;
 193                         unsigned short filename_off;
 194                         unsigned short filename_line;
 195                 } rule;
 196                 struct {
 197                         enum token_type type:8;
 198                         enum operation_type op:8;
 199                         enum string_glob_type glob:8;
 200                         enum string_subst_type subst:4;
 201                         enum string_subst_type attrsubst:4;
 202                         unsigned int value_off;
 203                         union {
 204                                 unsigned int attr_off;
 205                                 int devlink_unique;
 206                                 unsigned int rule_goto;
 207                                 mode_t  mode;
 208                                 uid_t uid;
 209                                 gid_t gid;
 210                                 int devlink_prio;
 211                                 int event_timeout;
 212                                 int watch;
 213                                 enum udev_builtin_cmd builtin_cmd;
 214                         };
 215                 } key;
 216         };
 217 };
 218
 219 #define MAX_TK                64
 220 struct rule_tmp {
 221         struct udev_rules *rules;
 222         struct token rule;
 223         struct token token[MAX_TK];
 224         unsigned int token_cur;
 225 };
 226
 227 #ifdef DEBUG
 228 static const char *operation_str(enum operation_type type)
 229 {
 230         static const char *operation_strs[] = {
 231                 [OP_UNSET] =            "UNSET",
 232                 [OP_MATCH] =            "match",
 233                 [OP_NOMATCH] =          "nomatch",
 234                 [OP_MATCH_MAX] =        "MATCH_MAX",
 235
 236                 [OP_ADD] =              "add",
 237                 [OP_ASSIGN] =           "assign",
 238                 [OP_ASSIGN_FINAL] =     "assign-final",
 239 }        ;
 240
 241         return operation_strs[type];
 242 }
 243
 244 static const char *string_glob_str(enum string_glob_type type)
 245 {
 246         static const char *string_glob_strs[] = {
 247                 [GL_UNSET] =            "UNSET",
 248                 [GL_PLAIN] =            "plain",
 249                 [GL_GLOB] =             "glob",
 250                 [GL_SPLIT] =            "split",
 251                 [GL_SPLIT_GLOB] =       "split-glob",
 252                 [GL_SOMETHING] =        "split-glob",
 253         };
 254
 255         return string_glob_strs[type];
 256 }
 257
 258 static const char *token_str(enum token_type type)
 259 {
 260         static const char *token_strs[] = {
 261                 [TK_UNSET] =                    "UNSET",
 262                 [TK_RULE] =                     "RULE",
 263
 264                 [TK_M_ACTION] =                 "M ACTION",
 265                 [TK_M_DEVPATH] =                "M DEVPATH",
 266                 [TK_M_KERNEL] =                 "M KERNEL",
 267                 [TK_M_DEVLINK] =                "M DEVLINK",
 268                 [TK_M_NAME] =                   "M NAME",
 269                 [TK_M_ENV] =                    "M ENV",
 270                 [TK_M_TAG] =                    "M TAG",
 271                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 272                 [TK_M_DRIVER] =                 "M DRIVER",
 273                 [TK_M_WAITFOR] =                "M WAITFOR",
 274                 [TK_M_ATTR] =                   "M ATTR",
 275
 276                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 277                 [TK_M_KERNELS] =                "M KERNELS",
 278                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 279                 [TK_M_DRIVERS] =                "M DRIVERS",
 280                 [TK_M_ATTRS] =                  "M ATTRS",
 281                 [TK_M_TAGS] =                   "M TAGS",
 282                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 283
 284                 [TK_M_TEST] =                   "M TEST",
 285                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 286                 [TK_M_PROGRAM] =                "M PROGRAM",
 287                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 288                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 289                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 290                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 291                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 292                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 293                 [TK_M_RESULT] =                 "M RESULT",
 294                 [TK_M_MAX] =                    "M MAX",
 295
 296                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 297                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 298                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 299                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 300                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 301                 [TK_A_OWNER] =                  "A OWNER",
 302                 [TK_A_GROUP] =                  "A GROUP",
 303                 [TK_A_MODE] =                   "A MODE",
 304                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 305                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 306                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 307                 [TK_A_MODE_ID] =                "A MODE_ID",
 308                 [TK_A_ENV] =                    "A ENV",
 309                 [TK_A_TAG] =                    "A ENV",
 310                 [TK_A_NAME] =                   "A NAME",
 311                 [TK_A_DEVLINK] =                "A DEVLINK",
 312                 [TK_A_ATTR] =                   "A ATTR",
 313                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 314                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 315                 [TK_A_GOTO] =                   "A GOTO",
 316
 317                 [TK_END] =                      "END",
 318         };
 319
 320         return token_strs[type];
 321 }
 322
 323 static void dump_token(struct udev_rules *rules, struct token *token)
 324 {
 325         enum token_type type = token->type;
 326         enum operation_type op = token->key.op;
 327         enum string_glob_type glob = token->key.glob;
 328         const char *value = &rules->buf[token->key.value_off];
 329         const char *attr = &rules->buf[token->key.attr_off];
 330
 331         switch (type) {
 332         case TK_RULE:
 333                 {
 334                         const char *tks_ptr = (char *)rules->tokens;
 335                         const char *tk_ptr = (char *)token;
 336                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 337
 338                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 339                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 340                                   idx, token->rule.token_count,
 341                                   &rules->buf[token->rule.label_off]);
 342                         break;
 343                 }
 344         case TK_M_ACTION:
 345         case TK_M_DEVPATH:
 346         case TK_M_KERNEL:
 347         case TK_M_SUBSYSTEM:
 348         case TK_M_DRIVER:
 349         case TK_M_WAITFOR:
 350         case TK_M_DEVLINK:
 351         case TK_M_NAME:
 352         case TK_M_KERNELS:
 353         case TK_M_SUBSYSTEMS:
 354         case TK_M_DRIVERS:
 355         case TK_M_TAGS:
 356         case TK_M_PROGRAM:
 357         case TK_M_IMPORT_FILE:
 358         case TK_M_IMPORT_PROG:
 359         case TK_M_IMPORT_DB:
 360         case TK_M_IMPORT_CMDLINE:
 361         case TK_M_IMPORT_PARENT:
 362         case TK_M_RESULT:
 363         case TK_A_NAME:
 364         case TK_A_DEVLINK:
 365         case TK_A_OWNER:
 366         case TK_A_GROUP:
 367         case TK_A_MODE:
 368         case TK_A_RUN_BUILTIN:
 369         case TK_A_RUN_PROGRAM:
 370                 log_debug("%s %s '%s'(%s)\n",
 371                           token_str(type), operation_str(op), value, string_glob_str(glob));
 372                 break;
 373         case TK_M_IMPORT_BUILTIN:
 374                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 375                 break;
 376         case TK_M_ATTR:
 377         case TK_M_ATTRS:
 378         case TK_M_ENV:
 379         case TK_A_ATTR:
 380         case TK_A_ENV:
 381                 log_debug("%s %s '%s' '%s'(%s)\n",
 382                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 383                 break;
 384         case TK_M_TAG:
 385         case TK_A_TAG:
 386                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 387                 break;
 388         case TK_A_STRING_ESCAPE_NONE:
 389         case TK_A_STRING_ESCAPE_REPLACE:
 390         case TK_A_DB_PERSIST:
 391                 log_debug("%s\n", token_str(type));
 392                 break;
 393         case TK_M_TEST:
 394                 log_debug("%s %s '%s'(%s) %#o\n",
 395                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 396                 break;
 397         case TK_A_INOTIFY_WATCH:
 398                 log_debug("%s %u\n", token_str(type), token->key.watch);
 399                 break;
 400         case TK_A_DEVLINK_PRIO:
 401                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 402                 break;
 403         case TK_A_OWNER_ID:
 404                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 405                 break;
 406         case TK_A_GROUP_ID:
 407                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 408                 break;
 409         case TK_A_MODE_ID:
 410                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 411                 break;
 412         case TK_A_STATIC_NODE:
 413                 log_debug("%s '%s'\n", token_str(type), value);
 414                 break;
 415         case TK_M_EVENT_TIMEOUT:
 416                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 417                 break;
 418         case TK_A_GOTO:
 419                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 420                 break;
 421         case TK_END:
 422                 log_debug("* %s\n", token_str(type));
 423                 break;
 424         case TK_M_PARENTS_MIN:
 425         case TK_M_PARENTS_MAX:
 426         case TK_M_MAX:
 427         case TK_UNSET:
 428                 log_debug("unknown type %u\n", type);
 429                 break;
 430         }
 431 }
 432
 433 static void dump_rules(struct udev_rules *rules)
 434 {
 435         unsigned int i;
 436
 437         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 438                   rules->token_cur,
 439                   rules->token_cur * sizeof(struct token),
 440                   rules->buf_count,
 441                   rules->buf_cur);
 442         for(i = 0; i < rules->token_cur; i++)
 443                 dump_token(rules, &rules->tokens[i]);
 444 }
 445 #else
 446 static inline const char *operation_str(enum operation_type type) { return NULL; }
 447 static inline const char *token_str(enum token_type type) { return NULL; }
 448 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 449 static inline void dump_rules(struct udev_rules *rules) {}
 450 #endif /* DEBUG */
 451
 452 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 453 {
 454         int off;
 455
 456         /* grow buffer if needed */
 457         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 458                 char *buf;
 459                 unsigned int add;
 460
 461                 /* double the buffer size */
 462                 add = rules->buf_max;
 463                 if (add < bytes * 8)
 464                         add = bytes * 8;
 465
 466                 buf = realloc(rules->buf, rules->buf_max + add);
 467                 if (buf == NULL)
 468                         return -1;
 469                 rules->buf = buf;
 470                 rules->buf_max += add;
 471         }
 472         off = rules->buf_cur;
 473         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 474         rules->buf_cur += bytes;
 475         rules->buf_count++;
 476         return off;
 477 }
 478
 479 static int add_string(struct udev_rules *rules, const char *str)
 480 {
 481         unsigned int node_idx;
 482         struct trie_node *new_node;
 483         unsigned int new_node_idx;
 484         unsigned char key;
 485         unsigned short len;
 486         unsigned int depth;
 487         unsigned int off;
 488         struct trie_node *parent;
 489
 490         /* walk trie, start from last character of str to find matching tails */
 491         len = strlen(str);
 492         key = str[len-1];
 493         node_idx = 0;
 494         for (depth = 0; depth <= len; depth++) {
 495                 struct trie_node *node;
 496                 unsigned int child_idx;
 497
 498                 node = &rules->trie_nodes[node_idx];
 499                 off = node->value_off + node->value_len - len;
 500
 501                 /* match against current node */
 502                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 503                         return off;
 504
 505                 /* lookup child node */
 506                 key = str[len - 1 - depth];
 507                 child_idx = node->child_idx;
 508                 while (child_idx > 0) {
 509                         struct trie_node *child;
 510
 511                         child = &rules->trie_nodes[child_idx];
 512                         if (child->key == key)
 513                                 break;
 514                         child_idx = child->next_child_idx;
 515                 }
 516                 if (child_idx == 0)
 517                         break;
 518                 node_idx = child_idx;
 519         }
 520
 521         /* string not found, add it */
 522         off = add_new_string(rules, str, len + 1);
 523
 524         /* grow trie nodes if needed */
 525         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 526                 struct trie_node *nodes;
 527                 unsigned int add;
 528
 529                 /* double the buffer size */
 530                 add = rules->trie_nodes_max;
 531                 if (add < 8)
 532                         add = 8;
 533
 534                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 535                 if (nodes == NULL)
 536                         return -1;
 537                 rules->trie_nodes = nodes;
 538                 rules->trie_nodes_max += add;
 539         }
 540
 541         /* get a new node */
 542         new_node_idx = rules->trie_nodes_cur;
 543         rules->trie_nodes_cur++;
 544         new_node = &rules->trie_nodes[new_node_idx];
 545         memset(new_node, 0x00, sizeof(struct trie_node));
 546         new_node->value_off = off;
 547         new_node->value_len = len;
 548         new_node->key = key;
 549
 550         /* join the parent's child list */
 551         parent = &rules->trie_nodes[node_idx];
 552         if (parent->child_idx == 0) {
 553                 parent->child_idx = new_node_idx;
 554         } else {
 555                 struct trie_node *last_child;
 556
 557                 last_child = &rules->trie_nodes[parent->last_child_idx];
 558                 last_child->next_child_idx = new_node_idx;
 559         }
 560         parent->last_child_idx = new_node_idx;
 561         return off;
 562 }
 563
 564 static int add_token(struct udev_rules *rules, struct token *token)
 565 {
 566         /* grow buffer if needed */
 567         if (rules->token_cur+1 >= rules->token_max) {
 568                 struct token *tokens;
 569                 unsigned int add;
 570
 571                 /* double the buffer size */
 572                 add = rules->token_max;
 573                 if (add < 8)
 574                         add = 8;
 575
 576                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 577                 if (tokens == NULL)
 578                         return -1;
 579                 rules->tokens = tokens;
 580                 rules->token_max += add;
 581         }
 582         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 583         rules->token_cur++;
 584         return 0;
 585 }
 586
 587 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 588 {
 589         unsigned int i;
 590         uid_t uid;
 591         unsigned int off;
 592
 593         /* lookup, if we know it already */
 594         for (i = 0; i < rules->uids_cur; i++) {
 595                 off = rules->uids[i].name_off;
 596                 if (streq(&rules->buf[off], owner)) {
 597                         uid = rules->uids[i].uid;
 598                         return uid;
 599                 }
 600         }
 601         uid = util_lookup_user(rules->udev, owner);
 602
 603         /* grow buffer if needed */
 604         if (rules->uids_cur+1 >= rules->uids_max) {
 605                 struct uid_gid *uids;
 606                 unsigned int add;
 607
 608                 /* double the buffer size */
 609                 add = rules->uids_max;
 610                 if (add < 1)
 611                         add = 8;
 612
 613                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 614                 if (uids == NULL)
 615                         return uid;
 616                 rules->uids = uids;
 617                 rules->uids_max += add;
 618         }
 619         rules->uids[rules->uids_cur].uid = uid;
 620         off = add_string(rules, owner);
 621         if (off <= 0)
 622                 return uid;
 623         rules->uids[rules->uids_cur].name_off = off;
 624         rules->uids_cur++;
 625         return uid;
 626 }
 627
 628 static gid_t add_gid(struct udev_rules *rules, const char *group)
 629 {
 630         unsigned int i;
 631         gid_t gid;
 632         unsigned int off;
 633
 634         /* lookup, if we know it already */
 635         for (i = 0; i < rules->gids_cur; i++) {
 636                 off = rules->gids[i].name_off;
 637                 if (streq(&rules->buf[off], group)) {
 638                         gid = rules->gids[i].gid;
 639                         return gid;
 640                 }
 641         }
 642         gid = util_lookup_group(rules->udev, group);
 643
 644         /* grow buffer if needed */
 645         if (rules->gids_cur+1 >= rules->gids_max) {
 646                 struct uid_gid *gids;
 647                 unsigned int add;
 648
 649                 /* double the buffer size */
 650                 add = rules->gids_max;
 651                 if (add < 1)
 652                         add = 8;
 653
 654                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 655                 if (gids == NULL)
 656                         return gid;
 657                 rules->gids = gids;
 658                 rules->gids_max += add;
 659         }
 660         rules->gids[rules->gids_cur].gid = gid;
 661         off = add_string(rules, group);
 662         if (off <= 0)
 663                 return gid;
 664         rules->gids[rules->gids_cur].name_off = off;
 665         rules->gids_cur++;
 666         return gid;
 667 }
 668
 669 static int import_property_from_string(struct udev_device *dev, char *line)
 670 {
 671         char *key;
 672         char *val;
 673         size_t len;
 674
 675         /* find key */
 676         key = line;
 677         while (isspace(key[0]))
 678                 key++;
 679
 680         /* comment or empty line */
 681         if (key[0] == '#' || key[0] == '\0')
 682                 return -1;
 683
 684         /* split key/value */
 685         val = strchr(key, '=');
 686         if (val == NULL)
 687                 return -1;
 688         val[0] = '\0';
 689         val++;
 690
 691         /* find value */
 692         while (isspace(val[0]))
 693                 val++;
 694
 695         /* terminate key */
 696         len = strlen(key);
 697         if (len == 0)
 698                 return -1;
 699         while (isspace(key[len-1]))
 700                 len--;
 701         key[len] = '\0';
 702
 703         /* terminate value */
 704         len = strlen(val);
 705         if (len == 0)
 706                 return -1;
 707         while (isspace(val[len-1]))
 708                 len--;
 709         val[len] = '\0';
 710
 711         if (len == 0)
 712                 return -1;
 713
 714         /* unquote */
 715         if (val[0] == '"' || val[0] == '\'') {
 716                 if (val[len-1] != val[0]) {
 717                         log_debug("inconsistent quoting: '%s', skip\n", line);
 718                         return -1;
 719                 }
 720                 val[len-1] = '\0';
 721                 val++;
 722         }
 723
 724         /* handle device, renamed by external tool, returning new path */
 725         if (streq(key, "DEVPATH")) {
 726                 char syspath[UTIL_PATH_SIZE];
 727
 728                 log_debug("updating devpath from '%s' to '%s'\n",
 729                           udev_device_get_devpath(dev), val);
 730                 util_strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
 731                 udev_device_set_syspath(dev, syspath);
 732         } else {
 733                 struct udev_list_entry *entry;
 734
 735                 entry = udev_device_add_property(dev, key, val);
 736                 /* store in db, skip private keys */
 737                 if (key[0] != '.')
 738                         udev_list_entry_set_num(entry, true);
 739         }
 740         return 0;
 741 }
 742
 743 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 744 {
 745         FILE *f;
 746         char line[UTIL_LINE_SIZE];
 747
 748         f = fopen(filename, "re");
 749         if (f == NULL)
 750                 return -1;
 751         while (fgets(line, sizeof(line), f) != NULL)
 752                 import_property_from_string(dev, line);
 753         fclose(f);
 754         return 0;
 755 }
 756
 757 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 758 {
 759         struct udev_device *dev = event->dev;
 760         char **envp;
 761         char result[UTIL_LINE_SIZE];
 762         char *line;
 763         int err;
 764
 765         envp = udev_device_get_properties_envp(dev);
 766         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 767         if (err < 0)
 768                 return err;
 769
 770         line = result;
 771         while (line != NULL) {
 772                 char *pos;
 773
 774                 pos = strchr(line, '\n');
 775                 if (pos != NULL) {
 776                         pos[0] = '\0';
 777                         pos = &pos[1];
 778                 }
 779                 import_property_from_string(dev, line);
 780                 line = pos;
 781         }
 782         return 0;
 783 }
 784
 785 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 786 {
 787         struct udev_device *dev_parent;
 788         struct udev_list_entry *list_entry;
 789
 790         dev_parent = udev_device_get_parent(dev);
 791         if (dev_parent == NULL)
 792                 return -1;
 793
 794         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 795                 const char *key = udev_list_entry_get_name(list_entry);
 796                 const char *val = udev_list_entry_get_value(list_entry);
 797
 798                 if (fnmatch(filter, key, 0) == 0) {
 799                         struct udev_list_entry *entry;
 800
 801                         entry = udev_device_add_property(dev, key, val);
 802                         /* store in db, skip private keys */
 803                         if (key[0] != '.')
 804                                 udev_list_entry_set_num(entry, true);
 805                 }
 806         }
 807         return 0;
 808 }
 809
 810 #define WAIT_LOOP_PER_SECOND                50
 811 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 812 {
 813         char filepath[UTIL_PATH_SIZE];
 814         char devicepath[UTIL_PATH_SIZE];
 815         struct stat stats;
 816         int loop = timeout * WAIT_LOOP_PER_SECOND;
 817
 818         /* a relative path is a device attribute */
 819         devicepath[0] = '\0';
 820         if (file[0] != '/') {
 821                 util_strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
 822                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 823                 file = filepath;
 824         }
 825
 826         while (--loop) {
 827                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 828
 829                 /* lookup file */
 830                 if (stat(file, &stats) == 0) {
 831                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 832                         return 0;
 833                 }
 834                 /* make sure, the device did not disappear in the meantime */
 835                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 836                         log_debug("device disappeared while waiting for '%s'\n", file);
 837                         return -2;
 838                 }
 839                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 840                 nanosleep(&duration, NULL);
 841         }
 842         log_debug("waiting for '%s' failed\n", file);
 843         return -1;
 844 }
 845
 846 static int attr_subst_subdir(char *attr, size_t len)
 847 {
 848         bool found = false;
 849
 850         if (strstr(attr, "/*/")) {
 851                 char *pos;
 852                 char dirname[UTIL_PATH_SIZE];
 853                 const char *tail;
 854                 DIR *dir;
 855
 856                 util_strscpy(dirname, sizeof(dirname), attr);
 857                 pos = strstr(dirname, "/*/");
 858                 if (pos == NULL)
 859                         return -1;
 860                 pos[0] = '\0';
 861                 tail = &pos[2];
 862                 dir = opendir(dirname);
 863                 if (dir != NULL) {
 864                         struct dirent *dent;
 865
 866                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 867                                 struct stat stats;
 868
 869                                 if (dent->d_name[0] == '.')
 870                                         continue;
 871                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 872                                 if (stat(attr, &stats) == 0) {
 873                                         found = true;
 874                                         break;
 875                                 }
 876                         }
 877                         closedir(dir);
 878                 }
 879         }
 880
 881         return found;
 882 }
 883
 884 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 885 {
 886         char *linepos;
 887         char *temp;
 888
 889         linepos = *line;
 890         if (linepos == NULL || linepos[0] == '\0')
 891                 return -1;
 892
 893         /* skip whitespace */
 894         while (isspace(linepos[0]) || linepos[0] == ',')
 895                 linepos++;
 896
 897         /* get the key */
 898         if (linepos[0] == '\0')
 899                 return -1;
 900         *key = linepos;
 901
 902         for (;;) {
 903                 linepos++;
 904                 if (linepos[0] == '\0')
 905                         return -1;
 906                 if (isspace(linepos[0]))
 907                         break;
 908                 if (linepos[0] == '=')
 909                         break;
 910                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 911                         if (linepos[1] == '=')
 912                                 break;
 913         }
 914
 915         /* remember end of key */
 916         temp = linepos;
 917
 918         /* skip whitespace after key */
 919         while (isspace(linepos[0]))
 920                 linepos++;
 921         if (linepos[0] == '\0')
 922                 return -1;
 923
 924         /* get operation type */
 925         if (linepos[0] == '=' && linepos[1] == '=') {
 926                 *op = OP_MATCH;
 927                 linepos += 2;
 928         } else if (linepos[0] == '!' && linepos[1] == '=') {
 929                 *op = OP_NOMATCH;
 930                 linepos += 2;
 931         } else if (linepos[0] == '+' && linepos[1] == '=') {
 932                 *op = OP_ADD;
 933                 linepos += 2;
 934         } else if (linepos[0] == '=') {
 935                 *op = OP_ASSIGN;
 936                 linepos++;
 937         } else if (linepos[0] == ':' && linepos[1] == '=') {
 938                 *op = OP_ASSIGN_FINAL;
 939                 linepos += 2;
 940         } else
 941                 return -1;
 942
 943         /* terminate key */
 944         temp[0] = '\0';
 945
 946         /* skip whitespace after operator */
 947         while (isspace(linepos[0]))
 948                 linepos++;
 949         if (linepos[0] == '\0')
 950                 return -1;
 951
 952         /* get the value */
 953         if (linepos[0] == '"')
 954                 linepos++;
 955         else
 956                 return -1;
 957         *value = linepos;
 958
 959         /* terminate */
 960         temp = strchr(linepos, '"');
 961         if (!temp)
 962                 return -1;
 963         temp[0] = '\0';
 964         temp++;
 965
 966         /* move line to next key */
 967         *line = temp;
 968         return 0;
 969 }
 970
 971 /* extract possible KEY{attr} */
 972 static const char *get_key_attribute(struct udev *udev, char *str)
 973 {
 974         char *pos;
 975         char *attr;
 976
 977         attr = strchr(str, '{');
 978         if (attr != NULL) {
 979                 attr++;
 980                 pos = strchr(attr, '}');
 981                 if (pos == NULL) {
 982                         log_error("missing closing brace for format\n");
 983                         return NULL;
 984                 }
 985                 pos[0] = '\0';
 986                 return attr;
 987         }
 988         return NULL;
 989 }
 990
 991 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 992                         enum operation_type op,
 993                         const char *value, const void *data)
 994 {
 995         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 996         const char *attr = NULL;
 997
 998         memset(token, 0x00, sizeof(struct token));
 999
1000         switch (type) {
1001         case TK_M_ACTION:
1002         case TK_M_DEVPATH:
1003         case TK_M_KERNEL:
1004         case TK_M_SUBSYSTEM:
1005         case TK_M_DRIVER:
1006         case TK_M_WAITFOR:
1007         case TK_M_DEVLINK:
1008         case TK_M_NAME:
1009         case TK_M_KERNELS:
1010         case TK_M_SUBSYSTEMS:
1011         case TK_M_DRIVERS:
1012         case TK_M_TAGS:
1013         case TK_M_PROGRAM:
1014         case TK_M_IMPORT_FILE:
1015         case TK_M_IMPORT_PROG:
1016         case TK_M_IMPORT_DB:
1017         case TK_M_IMPORT_CMDLINE:
1018         case TK_M_IMPORT_PARENT:
1019         case TK_M_RESULT:
1020         case TK_A_OWNER:
1021         case TK_A_GROUP:
1022         case TK_A_MODE:
1023         case TK_A_NAME:
1024         case TK_A_GOTO:
1025         case TK_M_TAG:
1026         case TK_A_TAG:
1027                 token->key.value_off = add_string(rule_tmp->rules, value);
1028                 break;
1029         case TK_M_IMPORT_BUILTIN:
1030                 token->key.value_off = add_string(rule_tmp->rules, value);
1031                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1032                 break;
1033         case TK_M_ENV:
1034         case TK_M_ATTR:
1035         case TK_M_ATTRS:
1036         case TK_A_ATTR:
1037         case TK_A_ENV:
1038                 attr = data;
1039                 token->key.value_off = add_string(rule_tmp->rules, value);
1040                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1041                 break;
1042         case TK_A_DEVLINK:
1043                 token->key.value_off = add_string(rule_tmp->rules, value);
1044                 token->key.devlink_unique = *(int *)data;
1045                 break;
1046         case TK_M_TEST:
1047                 token->key.value_off = add_string(rule_tmp->rules, value);
1048                 if (data != NULL)
1049                         token->key.mode = *(mode_t *)data;
1050                 break;
1051         case TK_A_STRING_ESCAPE_NONE:
1052         case TK_A_STRING_ESCAPE_REPLACE:
1053         case TK_A_DB_PERSIST:
1054                 break;
1055         case TK_A_RUN_BUILTIN:
1056         case TK_A_RUN_PROGRAM:
1057                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1058                 token->key.value_off = add_string(rule_tmp->rules, value);
1059                 break;
1060         case TK_A_INOTIFY_WATCH:
1061         case TK_A_DEVLINK_PRIO:
1062                 token->key.devlink_prio = *(int *)data;
1063                 break;
1064         case TK_A_OWNER_ID:
1065                 token->key.uid = *(uid_t *)data;
1066                 break;
1067         case TK_A_GROUP_ID:
1068                 token->key.gid = *(gid_t *)data;
1069                 break;
1070         case TK_A_MODE_ID:
1071                 token->key.mode = *(mode_t *)data;
1072                 break;
1073         case TK_A_STATIC_NODE:
1074                 token->key.value_off = add_string(rule_tmp->rules, value);
1075                 break;
1076         case TK_M_EVENT_TIMEOUT:
1077                 token->key.event_timeout = *(int *)data;
1078                 break;
1079         case TK_RULE:
1080         case TK_M_PARENTS_MIN:
1081         case TK_M_PARENTS_MAX:
1082         case TK_M_MAX:
1083         case TK_END:
1084         case TK_UNSET:
1085                 log_error("wrong type %u\n", type);
1086                 return -1;
1087         }
1088
1089         if (value != NULL && type < TK_M_MAX) {
1090                 /* check if we need to split or call fnmatch() while matching rules */
1091                 enum string_glob_type glob;
1092                 int has_split;
1093                 int has_glob;
1094
1095                 has_split = (strchr(value, '|') != NULL);
1096                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1097                 if (has_split && has_glob) {
1098                         glob = GL_SPLIT_GLOB;
1099                 } else if (has_split) {
1100                         glob = GL_SPLIT;
1101                 } else if (has_glob) {
1102                         if (streq(value, "?*"))
1103                                 glob = GL_SOMETHING;
1104                         else
1105                                 glob = GL_GLOB;
1106                 } else {
1107                         glob = GL_PLAIN;
1108                 }
1109                 token->key.glob = glob;
1110         }
1111
1112         if (value != NULL && type > TK_M_MAX) {
1113                 /* check if assigned value has substitution chars */
1114                 if (value[0] == '[')
1115                         token->key.subst = SB_SUBSYS;
1116                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1117                         token->key.subst = SB_FORMAT;
1118                 else
1119                         token->key.subst = SB_NONE;
1120         }
1121
1122         if (attr != NULL) {
1123                 /* check if property/attribut name has substitution chars */
1124                 if (attr[0] == '[')
1125                         token->key.attrsubst = SB_SUBSYS;
1126                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1127                         token->key.attrsubst = SB_FORMAT;
1128                 else
1129                         token->key.attrsubst = SB_NONE;
1130         }
1131
1132         token->key.type = type;
1133         token->key.op = op;
1134         rule_tmp->token_cur++;
1135         if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1136                 log_error("temporary rule array too small\n");
1137                 return -1;
1138         }
1139         return 0;
1140 }
1141
1142 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1143 {
1144         unsigned int i;
1145         unsigned int start = 0;
1146         unsigned int end = rule_tmp->token_cur;
1147
1148         for (i = 0; i < rule_tmp->token_cur; i++) {
1149                 enum token_type next_val = TK_UNSET;
1150                 unsigned int next_idx = 0;
1151                 unsigned int j;
1152
1153                 /* find smallest value */
1154                 for (j = start; j < end; j++) {
1155                         if (rule_tmp->token[j].type == TK_UNSET)
1156                                 continue;
1157                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1158                                 next_val = rule_tmp->token[j].type;
1159                                 next_idx = j;
1160                         }
1161                 }
1162
1163                 /* add token and mark done */
1164                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1165                         return -1;
1166                 rule_tmp->token[next_idx].type = TK_UNSET;
1167
1168                 /* shrink range */
1169                 if (next_idx == start)
1170                         start++;
1171                 if (next_idx+1 == end)
1172                         end--;
1173         }
1174         return 0;
1175 }
1176
1177 static int add_rule(struct udev_rules *rules, char *line,
1178                     const char *filename, unsigned int filename_off, unsigned int lineno)
1179 {
1180         char *linepos;
1181         const char *attr;
1182         struct rule_tmp rule_tmp;
1183
1184         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1185         rule_tmp.rules = rules;
1186         rule_tmp.rule.type = TK_RULE;
1187         /* the offset in the rule is limited to unsigned short */
1188         if (filename_off < USHRT_MAX)
1189                 rule_tmp.rule.rule.filename_off = filename_off;
1190         rule_tmp.rule.rule.filename_line = lineno;
1191
1192         linepos = line;
1193         for (;;) {
1194                 char *key;
1195                 char *value;
1196                 enum operation_type op;
1197
1198                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1199                         break;
1200
1201                 if (streq(key, "ACTION")) {
1202                         if (op > OP_MATCH_MAX) {
1203                                 log_error("invalid ACTION operation\n");
1204                                 goto invalid;
1205                         }
1206                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1207                         continue;
1208                 }
1209
1210                 if (streq(key, "DEVPATH")) {
1211                         if (op > OP_MATCH_MAX) {
1212                                 log_error("invalid DEVPATH operation\n");
1213                                 goto invalid;
1214                         }
1215                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1216                         continue;
1217                 }
1218
1219                 if (streq(key, "KERNEL")) {
1220                         if (op > OP_MATCH_MAX) {
1221                                 log_error("invalid KERNEL operation\n");
1222                                 goto invalid;
1223                         }
1224                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1225                         continue;
1226                 }
1227
1228                 if (streq(key, "SUBSYSTEM")) {
1229                         if (op > OP_MATCH_MAX) {
1230                                 log_error("invalid SUBSYSTEM operation\n");
1231                                 goto invalid;
1232                         }
1233                         /* bus, class, subsystem events should all be the same */
1234                         if (streq(value, "subsystem") ||
1235                             streq(value, "bus") ||
1236                             streq(value, "class")) {
1237                                 if (streq(value, "bus") || streq(value, "class"))
1238                                         log_error("'%s' must be specified as 'subsystem' \n"
1239                                             "please fix it in %s:%u", value, filename, lineno);
1240                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1241                         } else
1242                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1243                         continue;
1244                 }
1245
1246                 if (streq(key, "DRIVER")) {
1247                         if (op > OP_MATCH_MAX) {
1248                                 log_error("invalid DRIVER operation\n");
1249                                 goto invalid;
1250                         }
1251                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1252                         continue;
1253                 }
1254
1255                 if (startswith(key, "ATTR{")) {
1256                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1257                         if (attr == NULL) {
1258                                 log_error("error parsing ATTR attribute\n");
1259                                 goto invalid;
1260                         }
1261                         if (op < OP_MATCH_MAX) {
1262                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1263                         } else {
1264                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1265                         }
1266                         continue;
1267                 }
1268
1269                 if (streq(key, "KERNELS")) {
1270                         if (op > OP_MATCH_MAX) {
1271                                 log_error("invalid KERNELS operation\n");
1272                                 goto invalid;
1273                         }
1274                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1275                         continue;
1276                 }
1277
1278                 if (streq(key, "SUBSYSTEMS")) {
1279                         if (op > OP_MATCH_MAX) {
1280                                 log_error("invalid SUBSYSTEMS operation\n");
1281                                 goto invalid;
1282                         }
1283                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1284                         continue;
1285                 }
1286
1287                 if (streq(key, "DRIVERS")) {
1288                         if (op > OP_MATCH_MAX) {
1289                                 log_error("invalid DRIVERS operation\n");
1290                                 goto invalid;
1291                         }
1292                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1293                         continue;
1294                 }
1295
1296                 if (startswith(key, "ATTRS{")) {
1297                         if (op > OP_MATCH_MAX) {
1298                                 log_error("invalid ATTRS operation\n");
1299                                 goto invalid;
1300                         }
1301                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1302                         if (attr == NULL) {
1303                                 log_error("error parsing ATTRS attribute\n");
1304                                 goto invalid;
1305                         }
1306                         if (startswith(attr, "device/"))
1307                                 log_error("the 'device' link may not be available in a future kernel, "
1308                                     "please fix it in %s:%u", filename, lineno);
1309                         else if (strstr(attr, "../") != NULL)
1310                                 log_error("do not reference parent sysfs directories directly, "
1311                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1312                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1313                         continue;
1314                 }
1315
1316                 if (streq(key, "TAGS")) {
1317                         if (op > OP_MATCH_MAX) {
1318                                 log_error("invalid TAGS operation\n");
1319                                 goto invalid;
1320                         }
1321                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1322                         continue;
1323                 }
1324
1325                 if (startswith(key, "ENV{")) {
1326                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1327                         if (attr == NULL) {
1328                                 log_error("error parsing ENV attribute\n");
1329                                 goto invalid;
1330                         }
1331                         if (op < OP_MATCH_MAX) {
1332                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1333                                         goto invalid;
1334                         } else {
1335                                 static const char *blacklist[] = {
1336                                         "ACTION",
1337                                         "SUBSYSTEM",
1338                                         "DEVTYPE",
1339                                         "MAJOR",
1340                                         "MINOR",
1341                                         "DRIVER",
1342                                         "IFINDEX",
1343                                         "DEVNAME",
1344                                         "DEVLINKS",
1345                                         "DEVPATH",
1346                                         "TAGS",
1347                                 };
1348                                 unsigned int i;
1349
1350                                 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1351                                         if (!streq(attr, blacklist[i]))
1352                                                 continue;
1353                                         log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1354                                         goto invalid;
1355                                 }
1356                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1357                                         goto invalid;
1358                         }
1359                         continue;
1360                 }
1361
1362                 if (streq(key, "TAG")) {
1363                         if (op < OP_MATCH_MAX)
1364                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1365                         else
1366                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1367                         continue;
1368                 }
1369
1370                 if (streq(key, "PROGRAM")) {
1371                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1372                         continue;
1373                 }
1374
1375                 if (streq(key, "RESULT")) {
1376                         if (op > OP_MATCH_MAX) {
1377                                 log_error("invalid RESULT operation\n");
1378                                 goto invalid;
1379                         }
1380                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1381                         continue;
1382                 }
1383
1384                 if (startswith(key, "IMPORT")) {
1385                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1386                         if (attr == NULL) {
1387                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1388                                 continue;
1389                         }
1390                         if (streq(attr, "program")) {
1391                                 /* find known built-in command */
1392                                 if (value[0] != '/') {
1393                                         enum udev_builtin_cmd cmd;
1394
1395                                         cmd = udev_builtin_lookup(value);
1396                                         if (cmd < UDEV_BUILTIN_MAX) {
1397                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1398                                                           value, filename, lineno);
1399                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1400                                                 continue;
1401                                         }
1402                                 }
1403                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1404                         } else if (streq(attr, "builtin")) {
1405                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1406
1407                                 if (cmd < UDEV_BUILTIN_MAX)
1408                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1409                                 else
1410                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1411                         } else if (streq(attr, "file")) {
1412                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1413                         } else if (streq(attr, "db")) {
1414                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1415                         } else if (streq(attr, "cmdline")) {
1416                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1417                         } else if (streq(attr, "parent")) {
1418                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1419                         } else
1420                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1421                         continue;
1422                 }
1423
1424                 if (startswith(key, "TEST")) {
1425                         mode_t mode = 0;
1426
1427                         if (op > OP_MATCH_MAX) {
1428                                 log_error("invalid TEST operation\n");
1429                                 goto invalid;
1430                         }
1431                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1432                         if (attr != NULL) {
1433                                 mode = strtol(attr, NULL, 8);
1434                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1435                         } else {
1436                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1437                         }
1438                         continue;
1439                 }
1440
1441                 if (startswith(key, "RUN")) {
1442                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1443                         if (attr == NULL)
1444                                 attr = "program";
1445
1446                         if (streq(attr, "builtin")) {
1447                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1448
1449                                 if (cmd < UDEV_BUILTIN_MAX)
1450                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1451                                 else
1452                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1453                         } else if (streq(attr, "program")) {
1454                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1455
1456                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1457                         } else {
1458                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1459                         }
1460
1461                         continue;
1462                 }
1463
1464                 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1465                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1466                         continue;
1467                 }
1468
1469                 if (streq(key, "LABEL")) {
1470                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1471                         continue;
1472                 }
1473
1474                 if (streq(key, "GOTO")) {
1475                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1476                         continue;
1477                 }
1478
1479                 if (startswith(key, "NAME")) {
1480                         if (op < OP_MATCH_MAX) {
1481                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1482                         } else {
1483                                 if (streq(value, "%k")) {
1484                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1485                                             "please remove it from %s:%u\n", filename, lineno);
1486                                         continue;
1487                                 }
1488                                 if (value[0] == '\0') {
1489                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1490                                                   "please remove it from %s:%u\n", filename, lineno);
1491                                         continue;
1492                                 }
1493                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1494                         }
1495                         rule_tmp.rule.rule.can_set_name = true;
1496                         continue;
1497                 }
1498
1499                 if (startswith(key, "SYMLINK")) {
1500                         if (op < OP_MATCH_MAX) {
1501                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1502                         } else {
1503                                 int flag = 0;
1504
1505                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1506                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1507                                         flag = 1;
1508                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1509                         }
1510                         rule_tmp.rule.rule.can_set_name = true;
1511                         continue;
1512                 }
1513
1514                 if (streq(key, "OWNER")) {
1515                         uid_t uid;
1516                         char *endptr;
1517
1518                         uid = strtoul(value, &endptr, 10);
1519                         if (endptr[0] == '\0') {
1520                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1521                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1522                                 uid = add_uid(rules, value);
1523                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1524                         } else if (rules->resolve_names >= 0) {
1525                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1526                         }
1527                         rule_tmp.rule.rule.can_set_name = true;
1528                         continue;
1529                 }
1530
1531                 if (streq(key, "GROUP")) {
1532                         gid_t gid;
1533                         char *endptr;
1534
1535                         gid = strtoul(value, &endptr, 10);
1536                         if (endptr[0] == '\0') {
1537                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1538                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1539                                 gid = add_gid(rules, value);
1540                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1541                         } else if (rules->resolve_names >= 0) {
1542                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1543                         }
1544                         rule_tmp.rule.rule.can_set_name = true;
1545                         continue;
1546                 }
1547
1548                 if (streq(key, "MODE")) {
1549                         mode_t mode;
1550                         char *endptr;
1551
1552                         mode = strtol(value, &endptr, 8);
1553                         if (endptr[0] == '\0')
1554                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1555                         else
1556                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1557                         rule_tmp.rule.rule.can_set_name = true;
1558                         continue;
1559                 }
1560
1561                 if (streq(key, "OPTIONS")) {
1562                         const char *pos;
1563
1564                         pos = strstr(value, "link_priority=");
1565                         if (pos != NULL) {
1566                                 int prio = atoi(&pos[strlen("link_priority=")]);
1567
1568                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1569                         }
1570
1571                         pos = strstr(value, "event_timeout=");
1572                         if (pos != NULL) {
1573                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1574
1575                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1576                         }
1577
1578                         pos = strstr(value, "string_escape=");
1579                         if (pos != NULL) {
1580                                 pos = &pos[strlen("string_escape=")];
1581                                 if (startswith(pos, "none"))
1582                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1583                                 else if (startswith(pos, "replace"))
1584                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1585                         }
1586
1587                         pos = strstr(value, "db_persist");
1588                         if (pos != NULL)
1589                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1590
1591                         pos = strstr(value, "nowatch");
1592                         if (pos != NULL) {
1593                                 const int off = 0;
1594
1595                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1596                         } else {
1597                                 pos = strstr(value, "watch");
1598                                 if (pos != NULL) {
1599                                         const int on = 1;
1600
1601                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1602                                 }
1603                         }
1604
1605                         pos = strstr(value, "static_node=");
1606                         if (pos != NULL) {
1607                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1608                                 rule_tmp.rule.rule.has_static_node = true;
1609                         }
1610
1611                         continue;
1612                 }
1613
1614                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1615                 goto invalid;
1616         }
1617
1618         /* add rule token */
1619         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1620         if (add_token(rules, &rule_tmp.rule) != 0)
1621                 goto invalid;
1622
1623         /* add tokens to list, sorted by type */
1624         if (sort_token(rules, &rule_tmp) != 0)
1625                 goto invalid;
1626
1627         return 0;
1628 invalid:
1629         log_error("invalid rule '%s:%u'\n", filename, lineno);
1630         return -1;
1631 }
1632
1633 static int parse_file(struct udev_rules *rules, const char *filename)
1634 {
1635         FILE *f;
1636         unsigned int first_token;
1637         unsigned int filename_off;
1638         char line[UTIL_LINE_SIZE];
1639         int line_nr = 0;
1640         unsigned int i;
1641
1642         if (null_or_empty_path(filename)) {
1643                 log_debug("skip empty file: %s\n", filename);
1644                 return 0;
1645         }
1646         log_debug("read rules file: %s\n", filename);
1647
1648         f = fopen(filename, "re");
1649         if (f == NULL)
1650                 return -1;
1651
1652         first_token = rules->token_cur;
1653         filename_off = add_string(rules, filename);
1654
1655         while (fgets(line, sizeof(line), f) != NULL) {
1656                 char *key;
1657                 size_t len;
1658
1659                 /* skip whitespace */
1660                 line_nr++;
1661                 key = line;
1662                 while (isspace(key[0]))
1663                         key++;
1664
1665                 /* comment */
1666                 if (key[0] == '#')
1667                         continue;
1668
1669                 len = strlen(line);
1670                 if (len < 3)
1671                         continue;
1672
1673                 /* continue reading if backslash+newline is found */
1674                 while (line[len-2] == '\\') {
1675                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1676                                 break;
1677                         if (strlen(&line[len-2]) < 2)
1678                                 break;
1679                         line_nr++;
1680                         len = strlen(line);
1681                 }
1682
1683                 if (len+1 >= sizeof(line)) {
1684                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1685                         continue;
1686                 }
1687                 add_rule(rules, key, filename, filename_off, line_nr);
1688         }
1689         fclose(f);
1690
1691         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1692         for (i = first_token+1; i < rules->token_cur; i++) {
1693                 if (rules->tokens[i].type == TK_A_GOTO) {
1694                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1695                         unsigned int j;
1696
1697                         for (j = i+1; j < rules->token_cur; j++) {
1698                                 if (rules->tokens[j].type != TK_RULE)
1699                                         continue;
1700                                 if (rules->tokens[j].rule.label_off == 0)
1701                                         continue;
1702                                 if (!streq(label, &rules->buf[rules->tokens[j].rule.label_off]))
1703                                         continue;
1704                                 rules->tokens[i].key.rule_goto = j;
1705                                 break;
1706                         }
1707                         if (rules->tokens[i].key.rule_goto == 0)
1708                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1709                 }
1710         }
1711         return 0;
1712 }
1713
1714 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1715 {
1716         struct udev_rules *rules;
1717         struct udev_list file_list;
1718         struct token end_token;
1719         char **files, **f;
1720         int r;
1721
1722         rules = calloc(1, sizeof(struct udev_rules));
1723         if (rules == NULL)
1724                 return NULL;
1725         rules->udev = udev;
1726         rules->resolve_names = resolve_names;
1727         udev_list_init(udev, &file_list, true);
1728
1729         /* init token array and string buffer */
1730         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1731         if (rules->tokens == NULL)
1732                 return udev_rules_unref(rules);
1733
1734         rules->token_max = PREALLOC_TOKEN;
1735
1736         rules->buf = malloc(PREALLOC_STRBUF);
1737         if (rules->buf == NULL)
1738                 return udev_rules_unref(rules);
1739
1740         rules->buf_max = PREALLOC_STRBUF;
1741         /* offset 0 is always '\0' */
1742         rules->buf[0] = '\0';
1743         rules->buf_cur = 1;
1744
1745         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1746         if (rules->trie_nodes == NULL)
1747                 return udev_rules_unref(rules);
1748
1749         rules->trie_nodes_max = PREALLOC_TRIE;
1750         /* offset 0 is the trie root, with an empty string */
1751         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1752         rules->trie_nodes_cur = 1;
1753
1754         rules->dirs = strv_new(SYSCONFDIR "/udev/rules.d",
1755                                "/run/udev/rules.d",
1756                                UDEVLIBEXECDIR "/rules.d",
1757                                NULL);
1758         if (!rules->dirs) {
1759                 log_error("failed to build config directory array");
1760                 return udev_rules_unref(rules);
1761         }
1762         if (!path_strv_canonicalize(rules->dirs)) {
1763                 log_error("failed to canonicalize config directories\n");
1764                 return udev_rules_unref(rules);
1765         }
1766         strv_uniq(rules->dirs);
1767
1768         rules->dirs_ts_usec = calloc(strv_length(rules->dirs), sizeof(long long));
1769         if(!rules->dirs_ts_usec)
1770                 return udev_rules_unref(rules);
1771         udev_rules_check_timestamp(rules);
1772
1773         r = conf_files_list_strv(&files, ".rules", (const char **)rules->dirs);
1774         if (r < 0) {
1775                 log_error("failed to enumerate rules files: %s\n", strerror(-r));
1776                 return udev_rules_unref(rules);
1777         }
1778
1779         /*
1780          * The offset value in the rules strct is limited; add all
1781          * rules file names to the beginning of the string buffer.
1782          */
1783         STRV_FOREACH(f, files)
1784                 add_string(rules, *f);
1785
1786         STRV_FOREACH(f, files)
1787                 parse_file(rules, *f);
1788
1789         strv_free(files);
1790
1791         memset(&end_token, 0x00, sizeof(struct token));
1792         end_token.type = TK_END;
1793         add_token(rules, &end_token);
1794
1795         /* shrink allocated token and string buffer */
1796         if (rules->token_cur < rules->token_max) {
1797                 struct token *tokens;
1798
1799                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1800                 if (tokens != NULL || rules->token_cur == 0) {
1801                         rules->tokens = tokens;
1802                         rules->token_max = rules->token_cur;
1803                 }
1804         }
1805         if (rules->buf_cur < rules->buf_max) {
1806                 char *buf;
1807
1808                 buf = realloc(rules->buf, rules->buf_cur);
1809                 if (buf != NULL || rules->buf_cur == 0) {
1810                         rules->buf = buf;
1811                         rules->buf_max = rules->buf_cur;
1812                 }
1813         }
1814         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1815                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1816         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1817                   rules->trie_nodes_cur * sizeof(struct trie_node),
1818                   rules->trie_nodes_cur, sizeof(struct trie_node));
1819
1820         /* cleanup trie */
1821         free(rules->trie_nodes);
1822         rules->trie_nodes = NULL;
1823         rules->trie_nodes_cur = 0;
1824         rules->trie_nodes_max = 0;
1825
1826         /* cleanup uid/gid cache */
1827         free(rules->uids);
1828         rules->uids = NULL;
1829         rules->uids_cur = 0;
1830         rules->uids_max = 0;
1831         free(rules->gids);
1832         rules->gids = NULL;
1833         rules->gids_cur = 0;
1834         rules->gids_max = 0;
1835
1836         dump_rules(rules);
1837         return rules;
1838 }
1839
1840 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1841 {
1842         if (rules == NULL)
1843                 return NULL;
1844         free(rules->tokens);
1845         free(rules->buf);
1846         free(rules->trie_nodes);
1847         free(rules->uids);
1848         free(rules->gids);
1849         strv_free(rules->dirs);
1850         free(rules->dirs_ts_usec);
1851         free(rules);
1852         return NULL;
1853 }
1854
1855 bool udev_rules_check_timestamp(struct udev_rules *rules)
1856 {
1857         unsigned int i;
1858         bool changed = false;
1859
1860         if (rules == NULL)
1861                 goto out;
1862
1863         for (i = 0; rules->dirs[i]; i++) {
1864                 struct stat stats;
1865
1866                 if (stat(rules->dirs[i], &stats) < 0)
1867                         continue;
1868
1869                 if (rules->dirs_ts_usec[i] == ts_usec(&stats.st_mtim))
1870                         continue;
1871
1872                 /* first check */
1873                 if (rules->dirs_ts_usec[i] != 0) {
1874                         log_debug("reload - timestamp of '%s' changed\n", rules->dirs[i]);
1875                         changed = true;
1876                 }
1877
1878                 /* update timestamp */
1879                 rules->dirs_ts_usec[i] = ts_usec(&stats.st_mtim);
1880         }
1881 out:
1882         return changed;
1883 }
1884
1885 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1886 {
1887         char *key_value = &rules->buf[token->key.value_off];
1888         char *pos;
1889         bool match = false;
1890
1891         if (val == NULL)
1892                 val = "";
1893
1894         switch (token->key.glob) {
1895         case GL_PLAIN:
1896                 match = (streq(key_value, val));
1897                 break;
1898         case GL_GLOB:
1899                 match = (fnmatch(key_value, val, 0) == 0);
1900                 break;
1901         case GL_SPLIT:
1902                 {
1903                         const char *s;
1904                         size_t len;
1905
1906                         s = &rules->buf[token->key.value_off];
1907                         len = strlen(val);
1908                         for (;;) {
1909                                 const char *next;
1910
1911                                 next = strchr(s, '|');
1912                                 if (next != NULL) {
1913                                         size_t matchlen = (size_t)(next - s);
1914
1915                                         match = (matchlen == len && strncmp(s, val, matchlen) == 0);
1916                                         if (match)
1917                                                 break;
1918                                 } else {
1919                                         match = (streq(s, val));
1920                                         break;
1921                                 }
1922                                 s = &next[1];
1923                         }
1924                         break;
1925                 }
1926         case GL_SPLIT_GLOB:
1927                 {
1928                         char value[UTIL_PATH_SIZE];
1929
1930                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1931                         key_value = value;
1932                         while (key_value != NULL) {
1933                                 pos = strchr(key_value, '|');
1934                                 if (pos != NULL) {
1935                                         pos[0] = '\0';
1936                                         pos = &pos[1];
1937                                 }
1938                                 match = (fnmatch(key_value, val, 0) == 0);
1939                                 if (match)
1940                                         break;
1941                                 key_value = pos;
1942                         }
1943                         break;
1944                 }
1945         case GL_SOMETHING:
1946                 match = (val[0] != '\0');
1947                 break;
1948         case GL_UNSET:
1949                 return -1;
1950         }
1951
1952         if (match && (token->key.op == OP_MATCH))
1953                 return 0;
1954         if (!match && (token->key.op == OP_NOMATCH))
1955                 return 0;
1956         return -1;
1957 }
1958
1959 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1960 {
1961         const char *name;
1962         char nbuf[UTIL_NAME_SIZE];
1963         const char *value;
1964         char vbuf[UTIL_NAME_SIZE];
1965         size_t len;
1966
1967         name = &rules->buf[cur->key.attr_off];
1968         switch (cur->key.attrsubst) {
1969         case SB_FORMAT:
1970                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1971                 name = nbuf;
1972                 /* fall through */
1973         case SB_NONE:
1974                 value = udev_device_get_sysattr_value(dev, name);
1975                 if (value == NULL)
1976                         return -1;
1977                 break;
1978         case SB_SUBSYS:
1979                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1980                         return -1;
1981                 value = vbuf;
1982                 break;
1983         default:
1984                 return -1;
1985         }
1986
1987         /* remove trailing whitespace, if not asked to match for it */
1988         len = strlen(value);
1989         if (len > 0 && isspace(value[len-1])) {
1990                 const char *key_value;
1991                 size_t klen;
1992
1993                 key_value = &rules->buf[cur->key.value_off];
1994                 klen = strlen(key_value);
1995                 if (klen > 0 && !isspace(key_value[klen-1])) {
1996                         if (value != vbuf) {
1997                                 util_strscpy(vbuf, sizeof(vbuf), value);
1998                                 value = vbuf;
1999                         }
2000                         while (len > 0 && isspace(vbuf[--len]))
2001                                 vbuf[len] = '\0';
2002                 }
2003         }
2004
2005         return match_key(rules, cur, value);
2006 }
2007
2008 enum escape_type {
2009         ESCAPE_UNSET,
2010         ESCAPE_NONE,
2011         ESCAPE_REPLACE,
2012 };
2013
2014 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2015 {
2016         struct token *cur;
2017         struct token *rule;
2018         enum escape_type esc = ESCAPE_UNSET;
2019         bool can_set_name;
2020
2021         if (rules->tokens == NULL)
2022                 return -1;
2023
2024         can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
2025                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2026                          udev_device_get_ifindex(event->dev) > 0));
2027
2028         /* loop through token list, match, run actions or forward to next rule */
2029         cur = &rules->tokens[0];
2030         rule = cur;
2031         for (;;) {
2032                 dump_token(rules, cur);
2033                 switch (cur->type) {
2034                 case TK_RULE:
2035                         /* current rule */
2036                         rule = cur;
2037                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2038                         if (!can_set_name && rule->rule.can_set_name)
2039                                 goto nomatch;
2040                         esc = ESCAPE_UNSET;
2041                         break;
2042                 case TK_M_ACTION:
2043                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2044                                 goto nomatch;
2045                         break;
2046                 case TK_M_DEVPATH:
2047                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2048                                 goto nomatch;
2049                         break;
2050                 case TK_M_KERNEL:
2051                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2052                                 goto nomatch;
2053                         break;
2054                 case TK_M_DEVLINK: {
2055                         struct udev_list_entry *list_entry;
2056                         bool match = false;
2057
2058                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2059                                 const char *devlink;
2060
2061                                 devlink =  udev_list_entry_get_name(list_entry) + strlen("/dev/");
2062                                 if (match_key(rules, cur, devlink) == 0) {
2063                                         match = true;
2064                                         break;
2065                                 }
2066                         }
2067                         if (!match)
2068                                 goto nomatch;
2069                         break;
2070                 }
2071                 case TK_M_NAME:
2072                         if (match_key(rules, cur, event->name) != 0)
2073                                 goto nomatch;
2074                         break;
2075                 case TK_M_ENV: {
2076                         const char *key_name = &rules->buf[cur->key.attr_off];
2077                         const char *value;
2078
2079                         value = udev_device_get_property_value(event->dev, key_name);
2080                         if (value == NULL)
2081                                 value = "";
2082                         if (match_key(rules, cur, value))
2083                                 goto nomatch;
2084                         break;
2085                 }
2086                 case TK_M_TAG: {
2087                         struct udev_list_entry *list_entry;
2088                         bool match = false;
2089
2090                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2091                                 if (streq(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry))) {
2092                                         match = true;
2093                                         break;
2094                                 }
2095                         }
2096                         if (!match && (cur->key.op != OP_NOMATCH))
2097                                 goto nomatch;
2098                         break;
2099                 }
2100                 case TK_M_SUBSYSTEM:
2101                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2102                                 goto nomatch;
2103                         break;
2104                 case TK_M_DRIVER:
2105                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2106                                 goto nomatch;
2107                         break;
2108                 case TK_M_WAITFOR: {
2109                         char filename[UTIL_PATH_SIZE];
2110                         int found;
2111
2112                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2113                         found = (wait_for_file(event->dev, filename, 10) == 0);
2114                         if (!found && (cur->key.op != OP_NOMATCH))
2115                                 goto nomatch;
2116                         break;
2117                 }
2118                 case TK_M_ATTR:
2119                         if (match_attr(rules, event->dev, event, cur) != 0)
2120                                 goto nomatch;
2121                         break;
2122                 case TK_M_KERNELS:
2123                 case TK_M_SUBSYSTEMS:
2124                 case TK_M_DRIVERS:
2125                 case TK_M_ATTRS:
2126                 case TK_M_TAGS: {
2127                         struct token *next;
2128
2129                         /* get whole sequence of parent matches */
2130                         next = cur;
2131                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2132                                 next++;
2133
2134                         /* loop over parents */
2135                         event->dev_parent = event->dev;
2136                         for (;;) {
2137                                 struct token *key;
2138
2139                                 /* loop over sequence of parent match keys */
2140                                 for (key = cur; key < next; key++ ) {
2141                                         dump_token(rules, key);
2142                                         switch(key->type) {
2143                                         case TK_M_KERNELS:
2144                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2145                                                         goto try_parent;
2146                                                 break;
2147                                         case TK_M_SUBSYSTEMS:
2148                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2149                                                         goto try_parent;
2150                                                 break;
2151                                         case TK_M_DRIVERS:
2152                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2153                                                         goto try_parent;
2154                                                 break;
2155                                         case TK_M_ATTRS:
2156                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2157                                                         goto try_parent;
2158                                                 break;
2159                                         case TK_M_TAGS: {
2160                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2161
2162                                                 if (match && key->key.op == OP_NOMATCH)
2163                                                         goto try_parent;
2164                                                 if (!match && key->key.op == OP_MATCH)
2165                                                         goto try_parent;
2166                                                 break;
2167                                         }
2168                                         default:
2169                                                 goto nomatch;
2170                                         }
2171                                 }
2172                                 break;
2173
2174                         try_parent:
2175                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2176                                 if (event->dev_parent == NULL)
2177                                         goto nomatch;
2178                         }
2179                         /* move behind our sequence of parent match keys */
2180                         cur = next;
2181                         continue;
2182                 }
2183                 case TK_M_TEST: {
2184                         char filename[UTIL_PATH_SIZE];
2185                         struct stat statbuf;
2186                         int match;
2187
2188                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2189                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2190                                 if (filename[0] != '/') {
2191                                         char tmp[UTIL_PATH_SIZE];
2192
2193                                         util_strscpy(tmp, sizeof(tmp), filename);
2194                                         util_strscpyl(filename, sizeof(filename),
2195                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2196                                 }
2197                         }
2198                         attr_subst_subdir(filename, sizeof(filename));
2199
2200                         match = (stat(filename, &statbuf) == 0);
2201                         if (match && cur->key.mode > 0)
2202                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2203                         if (match && cur->key.op == OP_NOMATCH)
2204                                 goto nomatch;
2205                         if (!match && cur->key.op == OP_MATCH)
2206                                 goto nomatch;
2207                         break;
2208                 }
2209                 case TK_M_EVENT_TIMEOUT:
2210                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2211                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2212                         break;
2213                 case TK_M_PROGRAM: {
2214                         char program[UTIL_PATH_SIZE];
2215                         char **envp;
2216                         char result[UTIL_PATH_SIZE];
2217
2218                         free(event->program_result);
2219                         event->program_result = NULL;
2220                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2221                         envp = udev_device_get_properties_envp(event->dev);
2222                         log_debug("PROGRAM '%s' %s:%u\n",
2223                                   program,
2224                                   &rules->buf[rule->rule.filename_off],
2225                                   rule->rule.filename_line);
2226
2227                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2228                                 if (cur->key.op != OP_NOMATCH)
2229                                         goto nomatch;
2230                         } else {
2231                                 int count;
2232
2233                                 util_remove_trailing_chars(result, '\n');
2234                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2235                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2236                                         if (count > 0)
2237                                                 log_debug("%i character(s) replaced\n" , count);
2238                                 }
2239                                 event->program_result = strdup(result);
2240                                 if (cur->key.op == OP_NOMATCH)
2241                                         goto nomatch;
2242                         }
2243                         break;
2244                 }
2245                 case TK_M_IMPORT_FILE: {
2246                         char import[UTIL_PATH_SIZE];
2247
2248                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2249                         if (import_file_into_properties(event->dev, import) != 0)
2250                                 if (cur->key.op != OP_NOMATCH)
2251                                         goto nomatch;
2252                         break;
2253                 }
2254                 case TK_M_IMPORT_PROG: {
2255                         char import[UTIL_PATH_SIZE];
2256
2257                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2258                         log_debug("IMPORT '%s' %s:%u\n",
2259                                   import,
2260                                   &rules->buf[rule->rule.filename_off],
2261                                   rule->rule.filename_line);
2262
2263                         if (import_program_into_properties(event, import, sigmask) != 0)
2264                                 if (cur->key.op != OP_NOMATCH)
2265                                         goto nomatch;
2266                         break;
2267                 }
2268                 case TK_M_IMPORT_BUILTIN: {
2269                         char command[UTIL_PATH_SIZE];
2270
2271                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2272                                 /* check if we ran already */
2273                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2274                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2275                                                   udev_builtin_name(cur->key.builtin_cmd),
2276                                                   &rules->buf[rule->rule.filename_off],
2277                                                   rule->rule.filename_line);
2278                                         /* return the result from earlier run */
2279                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2280                                         if (cur->key.op != OP_NOMATCH)
2281                                                         goto nomatch;
2282                                         break;
2283                                 }
2284                                 /* mark as ran */
2285                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2286                         }
2287
2288                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2289                         log_debug("IMPORT builtin '%s' %s:%u\n",
2290                                   udev_builtin_name(cur->key.builtin_cmd),
2291                                   &rules->buf[rule->rule.filename_off],
2292                                   rule->rule.filename_line);
2293
2294                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2295                                 /* remember failure */
2296                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2297                                           udev_builtin_name(cur->key.builtin_cmd));
2298                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2299                                 if (cur->key.op != OP_NOMATCH)
2300                                         goto nomatch;
2301                         }
2302                         break;
2303                 }
2304                 case TK_M_IMPORT_DB: {
2305                         const char *key = &rules->buf[cur->key.value_off];
2306                         const char *value;
2307
2308                         value = udev_device_get_property_value(event->dev_db, key);
2309                         if (value != NULL) {
2310                                 struct udev_list_entry *entry;
2311
2312                                 entry = udev_device_add_property(event->dev, key, value);
2313                                 udev_list_entry_set_num(entry, true);
2314                         } else {
2315                                 if (cur->key.op != OP_NOMATCH)
2316                                         goto nomatch;
2317                         }
2318                         break;
2319                 }
2320                 case TK_M_IMPORT_CMDLINE: {
2321                         FILE *f;
2322                         bool imported = false;
2323
2324                         f = fopen("/proc/cmdline", "re");
2325                         if (f != NULL) {
2326                                 char cmdline[4096];
2327
2328                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2329                                         const char *key = &rules->buf[cur->key.value_off];
2330                                         char *pos;
2331
2332                                         pos = strstr(cmdline, key);
2333                                         if (pos != NULL) {
2334                                                 struct udev_list_entry *entry;
2335
2336                                                 pos += strlen(key);
2337                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2338                                                         /* we import simple flags as 'FLAG=1' */
2339                                                         entry = udev_device_add_property(event->dev, key, "1");
2340                                                         udev_list_entry_set_num(entry, true);
2341                                                         imported = true;
2342                                                 } else if (pos[0] == '=') {
2343                                                         const char *value;
2344
2345                                                         pos++;
2346                                                         value = pos;
2347                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2348                                                                 pos++;
2349                                                         pos[0] = '\0';
2350                                                         entry = udev_device_add_property(event->dev, key, value);
2351                                                         udev_list_entry_set_num(entry, true);
2352                                                         imported = true;
2353                                                 }
2354                                         }
2355                                 }
2356                                 fclose(f);
2357                         }
2358                         if (!imported && cur->key.op != OP_NOMATCH)
2359                                 goto nomatch;
2360                         break;
2361                 }
2362                 case TK_M_IMPORT_PARENT: {
2363                         char import[UTIL_PATH_SIZE];
2364
2365                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2366                         if (import_parent_into_properties(event->dev, import) != 0)
2367                                 if (cur->key.op != OP_NOMATCH)
2368                                         goto nomatch;
2369                         break;
2370                 }
2371                 case TK_M_RESULT:
2372                         if (match_key(rules, cur, event->program_result) != 0)
2373                                 goto nomatch;
2374                         break;
2375                 case TK_A_STRING_ESCAPE_NONE:
2376                         esc = ESCAPE_NONE;
2377                         break;
2378                 case TK_A_STRING_ESCAPE_REPLACE:
2379                         esc = ESCAPE_REPLACE;
2380                         break;
2381                 case TK_A_DB_PERSIST:
2382                         udev_device_set_db_persist(event->dev);
2383                         break;
2384                 case TK_A_INOTIFY_WATCH:
2385                         if (event->inotify_watch_final)
2386                                 break;
2387                         if (cur->key.op == OP_ASSIGN_FINAL)
2388                                 event->inotify_watch_final = true;
2389                         event->inotify_watch = cur->key.watch;
2390                         break;
2391                 case TK_A_DEVLINK_PRIO:
2392                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2393                         break;
2394                 case TK_A_OWNER: {
2395                         char owner[UTIL_NAME_SIZE];
2396
2397                         if (event->owner_final)
2398                                 break;
2399                         if (cur->key.op == OP_ASSIGN_FINAL)
2400                                 event->owner_final = true;
2401                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2402                         event->uid = util_lookup_user(event->udev, owner);
2403                         log_debug("OWNER %u %s:%u\n",
2404                                   event->uid,
2405                                   &rules->buf[rule->rule.filename_off],
2406                                   rule->rule.filename_line);
2407                         break;
2408                 }
2409                 case TK_A_GROUP: {
2410                         char group[UTIL_NAME_SIZE];
2411
2412                         if (event->group_final)
2413                                 break;
2414                         if (cur->key.op == OP_ASSIGN_FINAL)
2415                                 event->group_final = true;
2416                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2417                         event->gid = util_lookup_group(event->udev, group);
2418                         log_debug("GROUP %u %s:%u\n",
2419                                   event->gid,
2420                                   &rules->buf[rule->rule.filename_off],
2421                                   rule->rule.filename_line);
2422                         break;
2423                 }
2424                 case TK_A_MODE: {
2425                         char mode_str[UTIL_NAME_SIZE];
2426                         mode_t mode;
2427                         char *endptr;
2428
2429                         if (event->mode_final)
2430                                 break;
2431                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2432                         mode = strtol(mode_str, &endptr, 8);
2433                         if (endptr[0] != '\0') {
2434                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2435                                 break;
2436                         }
2437                         if (cur->key.op == OP_ASSIGN_FINAL)
2438                                 event->mode_final = true;
2439                         event->mode_set = true;
2440                         event->mode = mode;
2441                         log_debug("MODE %#o %s:%u\n",
2442                                   event->mode,
2443                                   &rules->buf[rule->rule.filename_off],
2444                                   rule->rule.filename_line);
2445                         break;
2446                 }
2447                 case TK_A_OWNER_ID:
2448                         if (event->owner_final)
2449                                 break;
2450                         if (cur->key.op == OP_ASSIGN_FINAL)
2451                                 event->owner_final = true;
2452                         event->uid = cur->key.uid;
2453                         log_debug("OWNER %u %s:%u\n",
2454                                   event->uid,
2455                                   &rules->buf[rule->rule.filename_off],
2456                                   rule->rule.filename_line);
2457                         break;
2458                 case TK_A_GROUP_ID:
2459                         if (event->group_final)
2460                                 break;
2461                         if (cur->key.op == OP_ASSIGN_FINAL)
2462                                 event->group_final = true;
2463                         event->gid = cur->key.gid;
2464                         log_debug("GROUP %u %s:%u\n",
2465                                   event->gid,
2466                                   &rules->buf[rule->rule.filename_off],
2467                                   rule->rule.filename_line);
2468                         break;
2469                 case TK_A_MODE_ID:
2470                         if (event->mode_final)
2471                                 break;
2472                         if (cur->key.op == OP_ASSIGN_FINAL)
2473                                 event->mode_final = true;
2474                         event->mode_set = true;
2475                         event->mode = cur->key.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                 case TK_A_ENV: {
2482                         const char *name = &rules->buf[cur->key.attr_off];
2483                         char *value = &rules->buf[cur->key.value_off];
2484
2485                         if (value[0] != '\0') {
2486                                 char temp_value[UTIL_NAME_SIZE];
2487                                 struct udev_list_entry *entry;
2488
2489                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2490                                 entry = udev_device_add_property(event->dev, name, temp_value);
2491                                 /* store in db, skip private keys */
2492                                 if (name[0] != '.')
2493                                         udev_list_entry_set_num(entry, true);
2494                         } else {
2495                                 udev_device_add_property(event->dev, name, NULL);
2496                         }
2497                         break;
2498                 }
2499                 case TK_A_TAG: {
2500                         char tag[UTIL_PATH_SIZE];
2501                         const char *p;
2502
2503                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2504                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2505                                 udev_device_cleanup_tags_list(event->dev);
2506                         for (p = tag; *p != '\0'; p++) {
2507                                 if ((*p >= 'a' && *p <= 'z') ||
2508                                     (*p >= 'A' && *p <= 'Z') ||
2509                                     (*p >= '0' && *p <= '9') ||
2510                                     *p == '-' || *p == '_')
2511                                         continue;
2512                                 log_error("ignoring invalid tag name '%s'\n", tag);
2513                                 break;
2514                         }
2515                         udev_device_add_tag(event->dev, tag);
2516                         break;
2517                 }
2518                 case TK_A_NAME: {
2519                         const char *name  = &rules->buf[cur->key.value_off];
2520
2521                         char name_str[UTIL_PATH_SIZE];
2522                         int count;
2523
2524                         if (event->name_final)
2525                                 break;
2526                         if (cur->key.op == OP_ASSIGN_FINAL)
2527                                 event->name_final = true;
2528                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2529                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2530                                 count = util_replace_chars(name_str, "/");
2531                                 if (count > 0)
2532                                         log_debug("%i character(s) replaced\n", count);
2533                         }
2534                         if (major(udev_device_get_devnum(event->dev)) &&
2535                             (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2536                                 log_error("NAME=\"%s\" ignored, kernel device nodes "
2537                                     "can not be renamed; please fix it in %s:%u\n", name,
2538                                     &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2539                                 break;
2540                         }
2541                         free(event->name);
2542                         event->name = strdup(name_str);
2543                         log_debug("NAME '%s' %s:%u\n",
2544                                   event->name,
2545                                   &rules->buf[rule->rule.filename_off],
2546                                   rule->rule.filename_line);
2547                         break;
2548                 }
2549                 case TK_A_DEVLINK: {
2550                         char temp[UTIL_PATH_SIZE];
2551                         char filename[UTIL_PATH_SIZE];
2552                         char *pos, *next;
2553                         int count = 0;
2554
2555                         if (event->devlink_final)
2556                                 break;
2557                         if (major(udev_device_get_devnum(event->dev)) == 0)
2558                                 break;
2559                         if (cur->key.op == OP_ASSIGN_FINAL)
2560                                 event->devlink_final = true;
2561                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2562                                 udev_device_cleanup_devlinks_list(event->dev);
2563
2564                         /* allow  multiple symlinks separated by spaces */
2565                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2566                         if (esc == ESCAPE_UNSET)
2567                                 count = util_replace_chars(temp, "/ ");
2568                         else if (esc == ESCAPE_REPLACE)
2569                                 count = util_replace_chars(temp, "/");
2570                         if (count > 0)
2571                                 log_debug("%i character(s) replaced\n" , count);
2572                         pos = temp;
2573                         while (isspace(pos[0]))
2574                                 pos++;
2575                         next = strchr(pos, ' ');
2576                         while (next != NULL) {
2577                                 next[0] = '\0';
2578                                 log_debug("LINK '%s' %s:%u\n", pos,
2579                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2580                                 util_strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2581                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2582                                 while (isspace(next[1]))
2583                                         next++;
2584                                 pos = &next[1];
2585                                 next = strchr(pos, ' ');
2586                         }
2587                         if (pos[0] != '\0') {
2588                                 log_debug("LINK '%s' %s:%u\n", pos,
2589                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2590                                 util_strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2591                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2592                         }
2593                         break;
2594                 }
2595                 case TK_A_ATTR: {
2596                         const char *key_name = &rules->buf[cur->key.attr_off];
2597                         char attr[UTIL_PATH_SIZE];
2598                         char value[UTIL_NAME_SIZE];
2599                         FILE *f;
2600
2601                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2602                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2603                         attr_subst_subdir(attr, sizeof(attr));
2604
2605                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2606                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2607                                   &rules->buf[rule->rule.filename_off],
2608                                   rule->rule.filename_line);
2609                         f = fopen(attr, "we");
2610                         if (f != NULL) {
2611                                 if (fprintf(f, "%s", value) <= 0)
2612                                         log_error("error writing ATTR{%s}: %m\n", attr);
2613                                 fclose(f);
2614                         } else {
2615                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2616                         }
2617                         break;
2618                 }
2619                 case TK_A_RUN_BUILTIN:
2620                 case TK_A_RUN_PROGRAM: {
2621                         struct udev_list_entry *entry;
2622
2623                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2624                                 udev_list_cleanup(&event->run_list);
2625                         log_debug("RUN '%s' %s:%u\n",
2626                                   &rules->buf[cur->key.value_off],
2627                                   &rules->buf[rule->rule.filename_off],
2628                                   rule->rule.filename_line);
2629                         entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2630                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2631                         break;
2632                 }
2633                 case TK_A_GOTO:
2634                         if (cur->key.rule_goto == 0)
2635                                 break;
2636                         cur = &rules->tokens[cur->key.rule_goto];
2637                         continue;
2638                 case TK_END:
2639                         return 0;
2640
2641                 case TK_M_PARENTS_MIN:
2642                 case TK_M_PARENTS_MAX:
2643                 case TK_M_MAX:
2644                 case TK_UNSET:
2645                         log_error("wrong type %u\n", cur->type);
2646                         goto nomatch;
2647                 }
2648
2649                 cur++;
2650                 continue;
2651         nomatch:
2652                 /* fast-forward to next rule */
2653                 cur = rule + rule->rule.token_count;
2654         }
2655 }
2656
2657 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2658 {
2659         struct token *cur;
2660         struct token *rule;
2661         uid_t uid = 0;
2662         gid_t gid = 0;
2663         mode_t mode = 0;
2664
2665         if (rules->tokens == NULL)
2666                 return;
2667
2668         cur = &rules->tokens[0];
2669         rule = cur;
2670         for (;;) {
2671                 switch (cur->type) {
2672                 case TK_RULE:
2673                         /* current rule */
2674                         rule = cur;
2675
2676                         /* skip rules without a static_node tag */
2677                         if (!rule->rule.has_static_node)
2678                                 goto next;
2679
2680                         uid = 0;
2681                         gid = 0;
2682                         mode = 0;
2683                         break;
2684                 case TK_A_OWNER_ID:
2685                         uid = cur->key.uid;
2686                         break;
2687                 case TK_A_GROUP_ID:
2688                         gid = cur->key.gid;
2689                         break;
2690                 case TK_A_MODE_ID:
2691                         mode = cur->key.mode;
2692                         break;
2693                 case TK_A_STATIC_NODE: {
2694                         char filename[UTIL_PATH_SIZE];
2695                         struct stat stats;
2696
2697                         /* we assure, that the permissions tokens are sorted before the static token */
2698                         if (mode == 0 && uid == 0 && gid == 0)
2699                                 goto next;
2700                         util_strscpyl(filename, sizeof(filename), "/dev/",
2701                                       &rules->buf[cur->key.value_off], NULL);
2702                         if (stat(filename, &stats) != 0)
2703                                 goto next;
2704                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2705                                 goto next;
2706                         if (mode == 0) {
2707                                 if (gid > 0)
2708                                         mode = 0660;
2709                                 else
2710                                         mode = 0600;
2711                         }
2712                         if (mode != (stats.st_mode & 01777)) {
2713                                 chmod(filename, mode);
2714                                 log_debug("chmod '%s' %#o\n", filename, mode);
2715                         }
2716
2717                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2718                                 chown(filename, uid, gid);
2719                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2720                         }
2721
2722                         utimensat(AT_FDCWD, filename, NULL, 0);
2723                         break;
2724                 }
2725                 case TK_END:
2726                         return;
2727                 }
2728
2729                 cur++;
2730                 continue;
2731 next:
2732                 /* fast-forward to next rule */
2733                 cur = rule + rule->rule.token_count;
2734                 continue;
2735         }
2736 }