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                                 unsigned int rule_goto;
 206                                 mode_t  mode;
 207                                 uid_t uid;
 208                                 gid_t gid;
 209                                 int devlink_prio;
 210                                 int event_timeout;
 211                                 int watch;
 212                                 enum udev_builtin_cmd builtin_cmd;
 213                         };
 214                 } key;
 215         };
 216 };
 217
 218 #define MAX_TK                64
 219 struct rule_tmp {
 220         struct udev_rules *rules;
 221         struct token rule;
 222         struct token token[MAX_TK];
 223         unsigned int token_cur;
 224 };
 225
 226 #ifdef DEBUG
 227 static const char *operation_str(enum operation_type type)
 228 {
 229         static const char *operation_strs[] = {
 230                 [OP_UNSET] =            "UNSET",
 231                 [OP_MATCH] =            "match",
 232                 [OP_NOMATCH] =          "nomatch",
 233                 [OP_MATCH_MAX] =        "MATCH_MAX",
 234
 235                 [OP_ADD] =              "add",
 236                 [OP_ASSIGN] =           "assign",
 237                 [OP_ASSIGN_FINAL] =     "assign-final",
 238 }        ;
 239
 240         return operation_strs[type];
 241 }
 242
 243 static const char *string_glob_str(enum string_glob_type type)
 244 {
 245         static const char *string_glob_strs[] = {
 246                 [GL_UNSET] =            "UNSET",
 247                 [GL_PLAIN] =            "plain",
 248                 [GL_GLOB] =             "glob",
 249                 [GL_SPLIT] =            "split",
 250                 [GL_SPLIT_GLOB] =       "split-glob",
 251                 [GL_SOMETHING] =        "split-glob",
 252         };
 253
 254         return string_glob_strs[type];
 255 }
 256
 257 static const char *token_str(enum token_type type)
 258 {
 259         static const char *token_strs[] = {
 260                 [TK_UNSET] =                    "UNSET",
 261                 [TK_RULE] =                     "RULE",
 262
 263                 [TK_M_ACTION] =                 "M ACTION",
 264                 [TK_M_DEVPATH] =                "M DEVPATH",
 265                 [TK_M_KERNEL] =                 "M KERNEL",
 266                 [TK_M_DEVLINK] =                "M DEVLINK",
 267                 [TK_M_NAME] =                   "M NAME",
 268                 [TK_M_ENV] =                    "M ENV",
 269                 [TK_M_TAG] =                    "M TAG",
 270                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 271                 [TK_M_DRIVER] =                 "M DRIVER",
 272                 [TK_M_WAITFOR] =                "M WAITFOR",
 273                 [TK_M_ATTR] =                   "M ATTR",
 274
 275                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 276                 [TK_M_KERNELS] =                "M KERNELS",
 277                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 278                 [TK_M_DRIVERS] =                "M DRIVERS",
 279                 [TK_M_ATTRS] =                  "M ATTRS",
 280                 [TK_M_TAGS] =                   "M TAGS",
 281                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 282
 283                 [TK_M_TEST] =                   "M TEST",
 284                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 285                 [TK_M_PROGRAM] =                "M PROGRAM",
 286                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 287                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 288                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 289                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 290                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 291                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 292                 [TK_M_RESULT] =                 "M RESULT",
 293                 [TK_M_MAX] =                    "M MAX",
 294
 295                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 296                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 297                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 298                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 299                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 300                 [TK_A_OWNER] =                  "A OWNER",
 301                 [TK_A_GROUP] =                  "A GROUP",
 302                 [TK_A_MODE] =                   "A MODE",
 303                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 304                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 305                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 306                 [TK_A_MODE_ID] =                "A MODE_ID",
 307                 [TK_A_ENV] =                    "A ENV",
 308                 [TK_A_TAG] =                    "A ENV",
 309                 [TK_A_NAME] =                   "A NAME",
 310                 [TK_A_DEVLINK] =                "A DEVLINK",
 311                 [TK_A_ATTR] =                   "A ATTR",
 312                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 313                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 314                 [TK_A_GOTO] =                   "A GOTO",
 315
 316                 [TK_END] =                      "END",
 317         };
 318
 319         return token_strs[type];
 320 }
 321
 322 static void dump_token(struct udev_rules *rules, struct token *token)
 323 {
 324         enum token_type type = token->type;
 325         enum operation_type op = token->key.op;
 326         enum string_glob_type glob = token->key.glob;
 327         const char *value = &rules->buf[token->key.value_off];
 328         const char *attr = &rules->buf[token->key.attr_off];
 329
 330         switch (type) {
 331         case TK_RULE:
 332                 {
 333                         const char *tks_ptr = (char *)rules->tokens;
 334                         const char *tk_ptr = (char *)token;
 335                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 336
 337                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 338                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 339                                   idx, token->rule.token_count,
 340                                   &rules->buf[token->rule.label_off]);
 341                         break;
 342                 }
 343         case TK_M_ACTION:
 344         case TK_M_DEVPATH:
 345         case TK_M_KERNEL:
 346         case TK_M_SUBSYSTEM:
 347         case TK_M_DRIVER:
 348         case TK_M_WAITFOR:
 349         case TK_M_DEVLINK:
 350         case TK_M_NAME:
 351         case TK_M_KERNELS:
 352         case TK_M_SUBSYSTEMS:
 353         case TK_M_DRIVERS:
 354         case TK_M_TAGS:
 355         case TK_M_PROGRAM:
 356         case TK_M_IMPORT_FILE:
 357         case TK_M_IMPORT_PROG:
 358         case TK_M_IMPORT_DB:
 359         case TK_M_IMPORT_CMDLINE:
 360         case TK_M_IMPORT_PARENT:
 361         case TK_M_RESULT:
 362         case TK_A_NAME:
 363         case TK_A_DEVLINK:
 364         case TK_A_OWNER:
 365         case TK_A_GROUP:
 366         case TK_A_MODE:
 367         case TK_A_RUN_BUILTIN:
 368         case TK_A_RUN_PROGRAM:
 369                 log_debug("%s %s '%s'(%s)\n",
 370                           token_str(type), operation_str(op), value, string_glob_str(glob));
 371                 break;
 372         case TK_M_IMPORT_BUILTIN:
 373                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 374                 break;
 375         case TK_M_ATTR:
 376         case TK_M_ATTRS:
 377         case TK_M_ENV:
 378         case TK_A_ATTR:
 379         case TK_A_ENV:
 380                 log_debug("%s %s '%s' '%s'(%s)\n",
 381                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 382                 break;
 383         case TK_M_TAG:
 384         case TK_A_TAG:
 385                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 386                 break;
 387         case TK_A_STRING_ESCAPE_NONE:
 388         case TK_A_STRING_ESCAPE_REPLACE:
 389         case TK_A_DB_PERSIST:
 390                 log_debug("%s\n", token_str(type));
 391                 break;
 392         case TK_M_TEST:
 393                 log_debug("%s %s '%s'(%s) %#o\n",
 394                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 395                 break;
 396         case TK_A_INOTIFY_WATCH:
 397                 log_debug("%s %u\n", token_str(type), token->key.watch);
 398                 break;
 399         case TK_A_DEVLINK_PRIO:
 400                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 401                 break;
 402         case TK_A_OWNER_ID:
 403                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 404                 break;
 405         case TK_A_GROUP_ID:
 406                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 407                 break;
 408         case TK_A_MODE_ID:
 409                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 410                 break;
 411         case TK_A_STATIC_NODE:
 412                 log_debug("%s '%s'\n", token_str(type), value);
 413                 break;
 414         case TK_M_EVENT_TIMEOUT:
 415                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 416                 break;
 417         case TK_A_GOTO:
 418                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 419                 break;
 420         case TK_END:
 421                 log_debug("* %s\n", token_str(type));
 422                 break;
 423         case TK_M_PARENTS_MIN:
 424         case TK_M_PARENTS_MAX:
 425         case TK_M_MAX:
 426         case TK_UNSET:
 427                 log_debug("unknown type %u\n", type);
 428                 break;
 429         }
 430 }
 431
 432 static void dump_rules(struct udev_rules *rules)
 433 {
 434         unsigned int i;
 435
 436         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 437                   rules->token_cur,
 438                   rules->token_cur * sizeof(struct token),
 439                   rules->buf_count,
 440                   rules->buf_cur);
 441         for(i = 0; i < rules->token_cur; i++)
 442                 dump_token(rules, &rules->tokens[i]);
 443 }
 444 #else
 445 static inline const char *operation_str(enum operation_type type) { return NULL; }
 446 static inline const char *token_str(enum token_type type) { return NULL; }
 447 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 448 static inline void dump_rules(struct udev_rules *rules) {}
 449 #endif /* DEBUG */
 450
 451 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 452 {
 453         int off;
 454
 455         /* grow buffer if needed */
 456         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 457                 char *buf;
 458                 unsigned int add;
 459
 460                 /* double the buffer size */
 461                 add = rules->buf_max;
 462                 if (add < bytes * 8)
 463                         add = bytes * 8;
 464
 465                 buf = realloc(rules->buf, rules->buf_max + add);
 466                 if (buf == NULL)
 467                         return -1;
 468                 rules->buf = buf;
 469                 rules->buf_max += add;
 470         }
 471         off = rules->buf_cur;
 472         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 473         rules->buf_cur += bytes;
 474         rules->buf_count++;
 475         return off;
 476 }
 477
 478 static int add_string(struct udev_rules *rules, const char *str)
 479 {
 480         unsigned int node_idx;
 481         struct trie_node *new_node;
 482         unsigned int new_node_idx;
 483         unsigned char key;
 484         unsigned short len;
 485         unsigned int depth;
 486         unsigned int off;
 487         struct trie_node *parent;
 488
 489         /* walk trie, start from last character of str to find matching tails */
 490         len = strlen(str);
 491         key = str[len-1];
 492         node_idx = 0;
 493         for (depth = 0; depth <= len; depth++) {
 494                 struct trie_node *node;
 495                 unsigned int child_idx;
 496
 497                 node = &rules->trie_nodes[node_idx];
 498                 off = node->value_off + node->value_len - len;
 499
 500                 /* match against current node */
 501                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 502                         return off;
 503
 504                 /* lookup child node */
 505                 key = str[len - 1 - depth];
 506                 child_idx = node->child_idx;
 507                 while (child_idx > 0) {
 508                         struct trie_node *child;
 509
 510                         child = &rules->trie_nodes[child_idx];
 511                         if (child->key == key)
 512                                 break;
 513                         child_idx = child->next_child_idx;
 514                 }
 515                 if (child_idx == 0)
 516                         break;
 517                 node_idx = child_idx;
 518         }
 519
 520         /* string not found, add it */
 521         off = add_new_string(rules, str, len + 1);
 522
 523         /* grow trie nodes if needed */
 524         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 525                 struct trie_node *nodes;
 526                 unsigned int add;
 527
 528                 /* double the buffer size */
 529                 add = rules->trie_nodes_max;
 530                 if (add < 8)
 531                         add = 8;
 532
 533                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 534                 if (nodes == NULL)
 535                         return -1;
 536                 rules->trie_nodes = nodes;
 537                 rules->trie_nodes_max += add;
 538         }
 539
 540         /* get a new node */
 541         new_node_idx = rules->trie_nodes_cur;
 542         rules->trie_nodes_cur++;
 543         new_node = &rules->trie_nodes[new_node_idx];
 544         memset(new_node, 0x00, sizeof(struct trie_node));
 545         new_node->value_off = off;
 546         new_node->value_len = len;
 547         new_node->key = key;
 548
 549         /* join the parent's child list */
 550         parent = &rules->trie_nodes[node_idx];
 551         if (parent->child_idx == 0) {
 552                 parent->child_idx = new_node_idx;
 553         } else {
 554                 struct trie_node *last_child;
 555
 556                 last_child = &rules->trie_nodes[parent->last_child_idx];
 557                 last_child->next_child_idx = new_node_idx;
 558         }
 559         parent->last_child_idx = new_node_idx;
 560         return off;
 561 }
 562
 563 static int add_token(struct udev_rules *rules, struct token *token)
 564 {
 565         /* grow buffer if needed */
 566         if (rules->token_cur+1 >= rules->token_max) {
 567                 struct token *tokens;
 568                 unsigned int add;
 569
 570                 /* double the buffer size */
 571                 add = rules->token_max;
 572                 if (add < 8)
 573                         add = 8;
 574
 575                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 576                 if (tokens == NULL)
 577                         return -1;
 578                 rules->tokens = tokens;
 579                 rules->token_max += add;
 580         }
 581         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 582         rules->token_cur++;
 583         return 0;
 584 }
 585
 586 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 587 {
 588         unsigned int i;
 589         uid_t uid;
 590         unsigned int off;
 591
 592         /* lookup, if we know it already */
 593         for (i = 0; i < rules->uids_cur; i++) {
 594                 off = rules->uids[i].name_off;
 595                 if (streq(&rules->buf[off], owner)) {
 596                         uid = rules->uids[i].uid;
 597                         return uid;
 598                 }
 599         }
 600         uid = util_lookup_user(rules->udev, owner);
 601
 602         /* grow buffer if needed */
 603         if (rules->uids_cur+1 >= rules->uids_max) {
 604                 struct uid_gid *uids;
 605                 unsigned int add;
 606
 607                 /* double the buffer size */
 608                 add = rules->uids_max;
 609                 if (add < 1)
 610                         add = 8;
 611
 612                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 613                 if (uids == NULL)
 614                         return uid;
 615                 rules->uids = uids;
 616                 rules->uids_max += add;
 617         }
 618         rules->uids[rules->uids_cur].uid = uid;
 619         off = add_string(rules, owner);
 620         if (off <= 0)
 621                 return uid;
 622         rules->uids[rules->uids_cur].name_off = off;
 623         rules->uids_cur++;
 624         return uid;
 625 }
 626
 627 static gid_t add_gid(struct udev_rules *rules, const char *group)
 628 {
 629         unsigned int i;
 630         gid_t gid;
 631         unsigned int off;
 632
 633         /* lookup, if we know it already */
 634         for (i = 0; i < rules->gids_cur; i++) {
 635                 off = rules->gids[i].name_off;
 636                 if (streq(&rules->buf[off], group)) {
 637                         gid = rules->gids[i].gid;
 638                         return gid;
 639                 }
 640         }
 641         gid = util_lookup_group(rules->udev, group);
 642
 643         /* grow buffer if needed */
 644         if (rules->gids_cur+1 >= rules->gids_max) {
 645                 struct uid_gid *gids;
 646                 unsigned int add;
 647
 648                 /* double the buffer size */
 649                 add = rules->gids_max;
 650                 if (add < 1)
 651                         add = 8;
 652
 653                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 654                 if (gids == NULL)
 655                         return gid;
 656                 rules->gids = gids;
 657                 rules->gids_max += add;
 658         }
 659         rules->gids[rules->gids_cur].gid = gid;
 660         off = add_string(rules, group);
 661         if (off <= 0)
 662                 return gid;
 663         rules->gids[rules->gids_cur].name_off = off;
 664         rules->gids_cur++;
 665         return gid;
 666 }
 667
 668 static int import_property_from_string(struct udev_device *dev, char *line)
 669 {
 670         char *key;
 671         char *val;
 672         size_t len;
 673
 674         /* find key */
 675         key = line;
 676         while (isspace(key[0]))
 677                 key++;
 678
 679         /* comment or empty line */
 680         if (key[0] == '#' || key[0] == '\0')
 681                 return -1;
 682
 683         /* split key/value */
 684         val = strchr(key, '=');
 685         if (val == NULL)
 686                 return -1;
 687         val[0] = '\0';
 688         val++;
 689
 690         /* find value */
 691         while (isspace(val[0]))
 692                 val++;
 693
 694         /* terminate key */
 695         len = strlen(key);
 696         if (len == 0)
 697                 return -1;
 698         while (isspace(key[len-1]))
 699                 len--;
 700         key[len] = '\0';
 701
 702         /* terminate value */
 703         len = strlen(val);
 704         if (len == 0)
 705                 return -1;
 706         while (isspace(val[len-1]))
 707                 len--;
 708         val[len] = '\0';
 709
 710         if (len == 0)
 711                 return -1;
 712
 713         /* unquote */
 714         if (val[0] == '"' || val[0] == '\'') {
 715                 if (val[len-1] != val[0]) {
 716                         log_debug("inconsistent quoting: '%s', skip\n", line);
 717                         return -1;
 718                 }
 719                 val[len-1] = '\0';
 720                 val++;
 721         }
 722
 723         /* handle device, renamed by external tool, returning new path */
 724         if (streq(key, "DEVPATH")) {
 725                 char syspath[UTIL_PATH_SIZE];
 726
 727                 log_debug("updating devpath from '%s' to '%s'\n",
 728                           udev_device_get_devpath(dev), val);
 729                 util_strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
 730                 udev_device_set_syspath(dev, syspath);
 731         } else {
 732                 struct udev_list_entry *entry;
 733
 734                 entry = udev_device_add_property(dev, key, val);
 735                 /* store in db, skip private keys */
 736                 if (key[0] != '.')
 737                         udev_list_entry_set_num(entry, true);
 738         }
 739         return 0;
 740 }
 741
 742 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 743 {
 744         FILE *f;
 745         char line[UTIL_LINE_SIZE];
 746
 747         f = fopen(filename, "re");
 748         if (f == NULL)
 749                 return -1;
 750         while (fgets(line, sizeof(line), f) != NULL)
 751                 import_property_from_string(dev, line);
 752         fclose(f);
 753         return 0;
 754 }
 755
 756 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 757 {
 758         struct udev_device *dev = event->dev;
 759         char **envp;
 760         char result[UTIL_LINE_SIZE];
 761         char *line;
 762         int err;
 763
 764         envp = udev_device_get_properties_envp(dev);
 765         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 766         if (err < 0)
 767                 return err;
 768
 769         line = result;
 770         while (line != NULL) {
 771                 char *pos;
 772
 773                 pos = strchr(line, '\n');
 774                 if (pos != NULL) {
 775                         pos[0] = '\0';
 776                         pos = &pos[1];
 777                 }
 778                 import_property_from_string(dev, line);
 779                 line = pos;
 780         }
 781         return 0;
 782 }
 783
 784 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 785 {
 786         struct udev_device *dev_parent;
 787         struct udev_list_entry *list_entry;
 788
 789         dev_parent = udev_device_get_parent(dev);
 790         if (dev_parent == NULL)
 791                 return -1;
 792
 793         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 794                 const char *key = udev_list_entry_get_name(list_entry);
 795                 const char *val = udev_list_entry_get_value(list_entry);
 796
 797                 if (fnmatch(filter, key, 0) == 0) {
 798                         struct udev_list_entry *entry;
 799
 800                         entry = udev_device_add_property(dev, key, val);
 801                         /* store in db, skip private keys */
 802                         if (key[0] != '.')
 803                                 udev_list_entry_set_num(entry, true);
 804                 }
 805         }
 806         return 0;
 807 }
 808
 809 #define WAIT_LOOP_PER_SECOND                50
 810 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 811 {
 812         char filepath[UTIL_PATH_SIZE];
 813         char devicepath[UTIL_PATH_SIZE];
 814         struct stat stats;
 815         int loop = timeout * WAIT_LOOP_PER_SECOND;
 816
 817         /* a relative path is a device attribute */
 818         devicepath[0] = '\0';
 819         if (file[0] != '/') {
 820                 util_strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
 821                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 822                 file = filepath;
 823         }
 824
 825         while (--loop) {
 826                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 827
 828                 /* lookup file */
 829                 if (stat(file, &stats) == 0) {
 830                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 831                         return 0;
 832                 }
 833                 /* make sure, the device did not disappear in the meantime */
 834                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 835                         log_debug("device disappeared while waiting for '%s'\n", file);
 836                         return -2;
 837                 }
 838                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 839                 nanosleep(&duration, NULL);
 840         }
 841         log_debug("waiting for '%s' failed\n", file);
 842         return -1;
 843 }
 844
 845 static int attr_subst_subdir(char *attr, size_t len)
 846 {
 847         bool found = false;
 848
 849         if (strstr(attr, "/*/")) {
 850                 char *pos;
 851                 char dirname[UTIL_PATH_SIZE];
 852                 const char *tail;
 853                 DIR *dir;
 854
 855                 util_strscpy(dirname, sizeof(dirname), attr);
 856                 pos = strstr(dirname, "/*/");
 857                 if (pos == NULL)
 858                         return -1;
 859                 pos[0] = '\0';
 860                 tail = &pos[2];
 861                 dir = opendir(dirname);
 862                 if (dir != NULL) {
 863                         struct dirent *dent;
 864
 865                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 866                                 struct stat stats;
 867
 868                                 if (dent->d_name[0] == '.')
 869                                         continue;
 870                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 871                                 if (stat(attr, &stats) == 0) {
 872                                         found = true;
 873                                         break;
 874                                 }
 875                         }
 876                         closedir(dir);
 877                 }
 878         }
 879
 880         return found;
 881 }
 882
 883 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 884 {
 885         char *linepos;
 886         char *temp;
 887
 888         linepos = *line;
 889         if (linepos == NULL || linepos[0] == '\0')
 890                 return -1;
 891
 892         /* skip whitespace */
 893         while (isspace(linepos[0]) || linepos[0] == ',')
 894                 linepos++;
 895
 896         /* get the key */
 897         if (linepos[0] == '\0')
 898                 return -1;
 899         *key = linepos;
 900
 901         for (;;) {
 902                 linepos++;
 903                 if (linepos[0] == '\0')
 904                         return -1;
 905                 if (isspace(linepos[0]))
 906                         break;
 907                 if (linepos[0] == '=')
 908                         break;
 909                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 910                         if (linepos[1] == '=')
 911                                 break;
 912         }
 913
 914         /* remember end of key */
 915         temp = linepos;
 916
 917         /* skip whitespace after key */
 918         while (isspace(linepos[0]))
 919                 linepos++;
 920         if (linepos[0] == '\0')
 921                 return -1;
 922
 923         /* get operation type */
 924         if (linepos[0] == '=' && linepos[1] == '=') {
 925                 *op = OP_MATCH;
 926                 linepos += 2;
 927         } else if (linepos[0] == '!' && linepos[1] == '=') {
 928                 *op = OP_NOMATCH;
 929                 linepos += 2;
 930         } else if (linepos[0] == '+' && linepos[1] == '=') {
 931                 *op = OP_ADD;
 932                 linepos += 2;
 933         } else if (linepos[0] == '=') {
 934                 *op = OP_ASSIGN;
 935                 linepos++;
 936         } else if (linepos[0] == ':' && linepos[1] == '=') {
 937                 *op = OP_ASSIGN_FINAL;
 938                 linepos += 2;
 939         } else
 940                 return -1;
 941
 942         /* terminate key */
 943         temp[0] = '\0';
 944
 945         /* skip whitespace after operator */
 946         while (isspace(linepos[0]))
 947                 linepos++;
 948         if (linepos[0] == '\0')
 949                 return -1;
 950
 951         /* get the value */
 952         if (linepos[0] == '"')
 953                 linepos++;
 954         else
 955                 return -1;
 956         *value = linepos;
 957
 958         /* terminate */
 959         temp = strchr(linepos, '"');
 960         if (!temp)
 961                 return -1;
 962         temp[0] = '\0';
 963         temp++;
 964
 965         /* move line to next key */
 966         *line = temp;
 967         return 0;
 968 }
 969
 970 /* extract possible KEY{attr} */
 971 static const char *get_key_attribute(struct udev *udev, char *str)
 972 {
 973         char *pos;
 974         char *attr;
 975
 976         attr = strchr(str, '{');
 977         if (attr != NULL) {
 978                 attr++;
 979                 pos = strchr(attr, '}');
 980                 if (pos == NULL) {
 981                         log_error("missing closing brace for format\n");
 982                         return NULL;
 983                 }
 984                 pos[0] = '\0';
 985                 return attr;
 986         }
 987         return NULL;
 988 }
 989
 990 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 991                         enum operation_type op,
 992                         const char *value, const void *data)
 993 {
 994         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 995         const char *attr = NULL;
 996
 997         memset(token, 0x00, sizeof(struct token));
 998
 999         switch (type) {
1000         case TK_M_ACTION:
1001         case TK_M_DEVPATH:
1002         case TK_M_KERNEL:
1003         case TK_M_SUBSYSTEM:
1004         case TK_M_DRIVER:
1005         case TK_M_WAITFOR:
1006         case TK_M_DEVLINK:
1007         case TK_M_NAME:
1008         case TK_M_KERNELS:
1009         case TK_M_SUBSYSTEMS:
1010         case TK_M_DRIVERS:
1011         case TK_M_TAGS:
1012         case TK_M_PROGRAM:
1013         case TK_M_IMPORT_FILE:
1014         case TK_M_IMPORT_PROG:
1015         case TK_M_IMPORT_DB:
1016         case TK_M_IMPORT_CMDLINE:
1017         case TK_M_IMPORT_PARENT:
1018         case TK_M_RESULT:
1019         case TK_A_OWNER:
1020         case TK_A_GROUP:
1021         case TK_A_MODE:
1022         case TK_A_DEVLINK:
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_M_TEST:
1043                 token->key.value_off = add_string(rule_tmp->rules, value);
1044                 if (data != NULL)
1045                         token->key.mode = *(mode_t *)data;
1046                 break;
1047         case TK_A_STRING_ESCAPE_NONE:
1048         case TK_A_STRING_ESCAPE_REPLACE:
1049         case TK_A_DB_PERSIST:
1050                 break;
1051         case TK_A_RUN_BUILTIN:
1052         case TK_A_RUN_PROGRAM:
1053                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1054                 token->key.value_off = add_string(rule_tmp->rules, value);
1055                 break;
1056         case TK_A_INOTIFY_WATCH:
1057         case TK_A_DEVLINK_PRIO:
1058                 token->key.devlink_prio = *(int *)data;
1059                 break;
1060         case TK_A_OWNER_ID:
1061                 token->key.uid = *(uid_t *)data;
1062                 break;
1063         case TK_A_GROUP_ID:
1064                 token->key.gid = *(gid_t *)data;
1065                 break;
1066         case TK_A_MODE_ID:
1067                 token->key.mode = *(mode_t *)data;
1068                 break;
1069         case TK_A_STATIC_NODE:
1070                 token->key.value_off = add_string(rule_tmp->rules, value);
1071                 break;
1072         case TK_M_EVENT_TIMEOUT:
1073                 token->key.event_timeout = *(int *)data;
1074                 break;
1075         case TK_RULE:
1076         case TK_M_PARENTS_MIN:
1077         case TK_M_PARENTS_MAX:
1078         case TK_M_MAX:
1079         case TK_END:
1080         case TK_UNSET:
1081                 log_error("wrong type %u\n", type);
1082                 return -1;
1083         }
1084
1085         if (value != NULL && type < TK_M_MAX) {
1086                 /* check if we need to split or call fnmatch() while matching rules */
1087                 enum string_glob_type glob;
1088                 int has_split;
1089                 int has_glob;
1090
1091                 has_split = (strchr(value, '|') != NULL);
1092                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1093                 if (has_split && has_glob) {
1094                         glob = GL_SPLIT_GLOB;
1095                 } else if (has_split) {
1096                         glob = GL_SPLIT;
1097                 } else if (has_glob) {
1098                         if (streq(value, "?*"))
1099                                 glob = GL_SOMETHING;
1100                         else
1101                                 glob = GL_GLOB;
1102                 } else {
1103                         glob = GL_PLAIN;
1104                 }
1105                 token->key.glob = glob;
1106         }
1107
1108         if (value != NULL && type > TK_M_MAX) {
1109                 /* check if assigned value has substitution chars */
1110                 if (value[0] == '[')
1111                         token->key.subst = SB_SUBSYS;
1112                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1113                         token->key.subst = SB_FORMAT;
1114                 else
1115                         token->key.subst = SB_NONE;
1116         }
1117
1118         if (attr != NULL) {
1119                 /* check if property/attribut name has substitution chars */
1120                 if (attr[0] == '[')
1121                         token->key.attrsubst = SB_SUBSYS;
1122                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1123                         token->key.attrsubst = SB_FORMAT;
1124                 else
1125                         token->key.attrsubst = SB_NONE;
1126         }
1127
1128         token->key.type = type;
1129         token->key.op = op;
1130         rule_tmp->token_cur++;
1131         if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1132                 log_error("temporary rule array too small\n");
1133                 return -1;
1134         }
1135         return 0;
1136 }
1137
1138 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1139 {
1140         unsigned int i;
1141         unsigned int start = 0;
1142         unsigned int end = rule_tmp->token_cur;
1143
1144         for (i = 0; i < rule_tmp->token_cur; i++) {
1145                 enum token_type next_val = TK_UNSET;
1146                 unsigned int next_idx = 0;
1147                 unsigned int j;
1148
1149                 /* find smallest value */
1150                 for (j = start; j < end; j++) {
1151                         if (rule_tmp->token[j].type == TK_UNSET)
1152                                 continue;
1153                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1154                                 next_val = rule_tmp->token[j].type;
1155                                 next_idx = j;
1156                         }
1157                 }
1158
1159                 /* add token and mark done */
1160                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1161                         return -1;
1162                 rule_tmp->token[next_idx].type = TK_UNSET;
1163
1164                 /* shrink range */
1165                 if (next_idx == start)
1166                         start++;
1167                 if (next_idx+1 == end)
1168                         end--;
1169         }
1170         return 0;
1171 }
1172
1173 static int add_rule(struct udev_rules *rules, char *line,
1174                     const char *filename, unsigned int filename_off, unsigned int lineno)
1175 {
1176         char *linepos;
1177         const char *attr;
1178         struct rule_tmp rule_tmp;
1179
1180         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1181         rule_tmp.rules = rules;
1182         rule_tmp.rule.type = TK_RULE;
1183         /* the offset in the rule is limited to unsigned short */
1184         if (filename_off < USHRT_MAX)
1185                 rule_tmp.rule.rule.filename_off = filename_off;
1186         rule_tmp.rule.rule.filename_line = lineno;
1187
1188         linepos = line;
1189         for (;;) {
1190                 char *key;
1191                 char *value;
1192                 enum operation_type op;
1193
1194                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1195                         break;
1196
1197                 if (streq(key, "ACTION")) {
1198                         if (op > OP_MATCH_MAX) {
1199                                 log_error("invalid ACTION operation\n");
1200                                 goto invalid;
1201                         }
1202                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1203                         continue;
1204                 }
1205
1206                 if (streq(key, "DEVPATH")) {
1207                         if (op > OP_MATCH_MAX) {
1208                                 log_error("invalid DEVPATH operation\n");
1209                                 goto invalid;
1210                         }
1211                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1212                         continue;
1213                 }
1214
1215                 if (streq(key, "KERNEL")) {
1216                         if (op > OP_MATCH_MAX) {
1217                                 log_error("invalid KERNEL operation\n");
1218                                 goto invalid;
1219                         }
1220                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1221                         continue;
1222                 }
1223
1224                 if (streq(key, "SUBSYSTEM")) {
1225                         if (op > OP_MATCH_MAX) {
1226                                 log_error("invalid SUBSYSTEM operation\n");
1227                                 goto invalid;
1228                         }
1229                         /* bus, class, subsystem events should all be the same */
1230                         if (streq(value, "subsystem") ||
1231                             streq(value, "bus") ||
1232                             streq(value, "class")) {
1233                                 if (streq(value, "bus") || streq(value, "class"))
1234                                         log_error("'%s' must be specified as 'subsystem' \n"
1235                                             "please fix it in %s:%u", value, filename, lineno);
1236                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1237                         } else
1238                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1239                         continue;
1240                 }
1241
1242                 if (streq(key, "DRIVER")) {
1243                         if (op > OP_MATCH_MAX) {
1244                                 log_error("invalid DRIVER operation\n");
1245                                 goto invalid;
1246                         }
1247                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1248                         continue;
1249                 }
1250
1251                 if (startswith(key, "ATTR{")) {
1252                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1253                         if (attr == NULL) {
1254                                 log_error("error parsing ATTR attribute\n");
1255                                 goto invalid;
1256                         }
1257                         if (op < OP_MATCH_MAX) {
1258                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1259                         } else {
1260                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1261                         }
1262                         continue;
1263                 }
1264
1265                 if (streq(key, "KERNELS")) {
1266                         if (op > OP_MATCH_MAX) {
1267                                 log_error("invalid KERNELS operation\n");
1268                                 goto invalid;
1269                         }
1270                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1271                         continue;
1272                 }
1273
1274                 if (streq(key, "SUBSYSTEMS")) {
1275                         if (op > OP_MATCH_MAX) {
1276                                 log_error("invalid SUBSYSTEMS operation\n");
1277                                 goto invalid;
1278                         }
1279                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1280                         continue;
1281                 }
1282
1283                 if (streq(key, "DRIVERS")) {
1284                         if (op > OP_MATCH_MAX) {
1285                                 log_error("invalid DRIVERS operation\n");
1286                                 goto invalid;
1287                         }
1288                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1289                         continue;
1290                 }
1291
1292                 if (startswith(key, "ATTRS{")) {
1293                         if (op > OP_MATCH_MAX) {
1294                                 log_error("invalid ATTRS operation\n");
1295                                 goto invalid;
1296                         }
1297                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1298                         if (attr == NULL) {
1299                                 log_error("error parsing ATTRS attribute\n");
1300                                 goto invalid;
1301                         }
1302                         if (startswith(attr, "device/"))
1303                                 log_error("the 'device' link may not be available in a future kernel, "
1304                                     "please fix it in %s:%u", filename, lineno);
1305                         else if (strstr(attr, "../") != NULL)
1306                                 log_error("do not reference parent sysfs directories directly, "
1307                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1308                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1309                         continue;
1310                 }
1311
1312                 if (streq(key, "TAGS")) {
1313                         if (op > OP_MATCH_MAX) {
1314                                 log_error("invalid TAGS operation\n");
1315                                 goto invalid;
1316                         }
1317                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1318                         continue;
1319                 }
1320
1321                 if (startswith(key, "ENV{")) {
1322                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1323                         if (attr == NULL) {
1324                                 log_error("error parsing ENV attribute\n");
1325                                 goto invalid;
1326                         }
1327                         if (op < OP_MATCH_MAX) {
1328                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1329                                         goto invalid;
1330                         } else {
1331                                 static const char *blacklist[] = {
1332                                         "ACTION",
1333                                         "SUBSYSTEM",
1334                                         "DEVTYPE",
1335                                         "MAJOR",
1336                                         "MINOR",
1337                                         "DRIVER",
1338                                         "IFINDEX",
1339                                         "DEVNAME",
1340                                         "DEVLINKS",
1341                                         "DEVPATH",
1342                                         "TAGS",
1343                                 };
1344                                 unsigned int i;
1345
1346                                 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1347                                         if (!streq(attr, blacklist[i]))
1348                                                 continue;
1349                                         log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1350                                         goto invalid;
1351                                 }
1352                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1353                                         goto invalid;
1354                         }
1355                         continue;
1356                 }
1357
1358                 if (streq(key, "TAG")) {
1359                         if (op < OP_MATCH_MAX)
1360                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1361                         else
1362                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1363                         continue;
1364                 }
1365
1366                 if (streq(key, "PROGRAM")) {
1367                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1368                         continue;
1369                 }
1370
1371                 if (streq(key, "RESULT")) {
1372                         if (op > OP_MATCH_MAX) {
1373                                 log_error("invalid RESULT operation\n");
1374                                 goto invalid;
1375                         }
1376                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1377                         continue;
1378                 }
1379
1380                 if (startswith(key, "IMPORT")) {
1381                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1382                         if (attr == NULL) {
1383                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1384                                 continue;
1385                         }
1386                         if (streq(attr, "program")) {
1387                                 /* find known built-in command */
1388                                 if (value[0] != '/') {
1389                                         enum udev_builtin_cmd cmd;
1390
1391                                         cmd = udev_builtin_lookup(value);
1392                                         if (cmd < UDEV_BUILTIN_MAX) {
1393                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1394                                                           value, filename, lineno);
1395                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1396                                                 continue;
1397                                         }
1398                                 }
1399                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1400                         } else if (streq(attr, "builtin")) {
1401                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1402
1403                                 if (cmd < UDEV_BUILTIN_MAX)
1404                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1405                                 else
1406                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1407                         } else if (streq(attr, "file")) {
1408                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1409                         } else if (streq(attr, "db")) {
1410                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1411                         } else if (streq(attr, "cmdline")) {
1412                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1413                         } else if (streq(attr, "parent")) {
1414                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1415                         } else
1416                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1417                         continue;
1418                 }
1419
1420                 if (startswith(key, "TEST")) {
1421                         mode_t mode = 0;
1422
1423                         if (op > OP_MATCH_MAX) {
1424                                 log_error("invalid TEST operation\n");
1425                                 goto invalid;
1426                         }
1427                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1428                         if (attr != NULL) {
1429                                 mode = strtol(attr, NULL, 8);
1430                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1431                         } else {
1432                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1433                         }
1434                         continue;
1435                 }
1436
1437                 if (startswith(key, "RUN")) {
1438                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1439                         if (attr == NULL)
1440                                 attr = "program";
1441
1442                         if (streq(attr, "builtin")) {
1443                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1444
1445                                 if (cmd < UDEV_BUILTIN_MAX)
1446                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1447                                 else
1448                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1449                         } else if (streq(attr, "program")) {
1450                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1451
1452                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1453                         } else {
1454                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1455                         }
1456
1457                         continue;
1458                 }
1459
1460                 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1461                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1462                         continue;
1463                 }
1464
1465                 if (streq(key, "LABEL")) {
1466                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1467                         continue;
1468                 }
1469
1470                 if (streq(key, "GOTO")) {
1471                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1472                         continue;
1473                 }
1474
1475                 if (startswith(key, "NAME")) {
1476                         if (op < OP_MATCH_MAX) {
1477                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1478                         } else {
1479                                 if (streq(value, "%k")) {
1480                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1481                                             "please remove it from %s:%u\n", filename, lineno);
1482                                         continue;
1483                                 }
1484                                 if (value[0] == '\0') {
1485                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1486                                                   "please remove it from %s:%u\n", filename, lineno);
1487                                         continue;
1488                                 }
1489                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1490                         }
1491                         rule_tmp.rule.rule.can_set_name = true;
1492                         continue;
1493                 }
1494
1495                 if (streq(key, "SYMLINK")) {
1496                         if (op < OP_MATCH_MAX)
1497                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1498                         else
1499                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1500                         rule_tmp.rule.rule.can_set_name = true;
1501                         continue;
1502                 }
1503
1504                 if (streq(key, "OWNER")) {
1505                         uid_t uid;
1506                         char *endptr;
1507
1508                         uid = strtoul(value, &endptr, 10);
1509                         if (endptr[0] == '\0') {
1510                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1511                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1512                                 uid = add_uid(rules, value);
1513                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1514                         } else if (rules->resolve_names >= 0) {
1515                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1516                         }
1517                         rule_tmp.rule.rule.can_set_name = true;
1518                         continue;
1519                 }
1520
1521                 if (streq(key, "GROUP")) {
1522                         gid_t gid;
1523                         char *endptr;
1524
1525                         gid = strtoul(value, &endptr, 10);
1526                         if (endptr[0] == '\0') {
1527                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1528                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1529                                 gid = add_gid(rules, value);
1530                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1531                         } else if (rules->resolve_names >= 0) {
1532                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1533                         }
1534                         rule_tmp.rule.rule.can_set_name = true;
1535                         continue;
1536                 }
1537
1538                 if (streq(key, "MODE")) {
1539                         mode_t mode;
1540                         char *endptr;
1541
1542                         mode = strtol(value, &endptr, 8);
1543                         if (endptr[0] == '\0')
1544                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1545                         else
1546                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1547                         rule_tmp.rule.rule.can_set_name = true;
1548                         continue;
1549                 }
1550
1551                 if (streq(key, "OPTIONS")) {
1552                         const char *pos;
1553
1554                         pos = strstr(value, "link_priority=");
1555                         if (pos != NULL) {
1556                                 int prio = atoi(&pos[strlen("link_priority=")]);
1557
1558                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1559                         }
1560
1561                         pos = strstr(value, "event_timeout=");
1562                         if (pos != NULL) {
1563                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1564
1565                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1566                         }
1567
1568                         pos = strstr(value, "string_escape=");
1569                         if (pos != NULL) {
1570                                 pos = &pos[strlen("string_escape=")];
1571                                 if (startswith(pos, "none"))
1572                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1573                                 else if (startswith(pos, "replace"))
1574                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1575                         }
1576
1577                         pos = strstr(value, "db_persist");
1578                         if (pos != NULL)
1579                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1580
1581                         pos = strstr(value, "nowatch");
1582                         if (pos != NULL) {
1583                                 const int off = 0;
1584
1585                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1586                         } else {
1587                                 pos = strstr(value, "watch");
1588                                 if (pos != NULL) {
1589                                         const int on = 1;
1590
1591                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1592                                 }
1593                         }
1594
1595                         pos = strstr(value, "static_node=");
1596                         if (pos != NULL) {
1597                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1598                                 rule_tmp.rule.rule.has_static_node = true;
1599                         }
1600
1601                         continue;
1602                 }
1603
1604                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1605                 goto invalid;
1606         }
1607
1608         /* add rule token */
1609         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1610         if (add_token(rules, &rule_tmp.rule) != 0)
1611                 goto invalid;
1612
1613         /* add tokens to list, sorted by type */
1614         if (sort_token(rules, &rule_tmp) != 0)
1615                 goto invalid;
1616
1617         return 0;
1618 invalid:
1619         log_error("invalid rule '%s:%u'\n", filename, lineno);
1620         return -1;
1621 }
1622
1623 static int parse_file(struct udev_rules *rules, const char *filename)
1624 {
1625         FILE *f;
1626         unsigned int first_token;
1627         unsigned int filename_off;
1628         char line[UTIL_LINE_SIZE];
1629         int line_nr = 0;
1630         unsigned int i;
1631
1632         if (null_or_empty_path(filename)) {
1633                 log_debug("skip empty file: %s\n", filename);
1634                 return 0;
1635         }
1636         log_debug("read rules file: %s\n", filename);
1637
1638         f = fopen(filename, "re");
1639         if (f == NULL)
1640                 return -1;
1641
1642         first_token = rules->token_cur;
1643         filename_off = add_string(rules, filename);
1644
1645         while (fgets(line, sizeof(line), f) != NULL) {
1646                 char *key;
1647                 size_t len;
1648
1649                 /* skip whitespace */
1650                 line_nr++;
1651                 key = line;
1652                 while (isspace(key[0]))
1653                         key++;
1654
1655                 /* comment */
1656                 if (key[0] == '#')
1657                         continue;
1658
1659                 len = strlen(line);
1660                 if (len < 3)
1661                         continue;
1662
1663                 /* continue reading if backslash+newline is found */
1664                 while (line[len-2] == '\\') {
1665                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1666                                 break;
1667                         if (strlen(&line[len-2]) < 2)
1668                                 break;
1669                         line_nr++;
1670                         len = strlen(line);
1671                 }
1672
1673                 if (len+1 >= sizeof(line)) {
1674                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1675                         continue;
1676                 }
1677                 add_rule(rules, key, filename, filename_off, line_nr);
1678         }
1679         fclose(f);
1680
1681         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1682         for (i = first_token+1; i < rules->token_cur; i++) {
1683                 if (rules->tokens[i].type == TK_A_GOTO) {
1684                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1685                         unsigned int j;
1686
1687                         for (j = i+1; j < rules->token_cur; j++) {
1688                                 if (rules->tokens[j].type != TK_RULE)
1689                                         continue;
1690                                 if (rules->tokens[j].rule.label_off == 0)
1691                                         continue;
1692                                 if (!streq(label, &rules->buf[rules->tokens[j].rule.label_off]))
1693                                         continue;
1694                                 rules->tokens[i].key.rule_goto = j;
1695                                 break;
1696                         }
1697                         if (rules->tokens[i].key.rule_goto == 0)
1698                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1699                 }
1700         }
1701         return 0;
1702 }
1703
1704 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1705 {
1706         struct udev_rules *rules;
1707         struct udev_list file_list;
1708         struct token end_token;
1709         char **files, **f;
1710         int r;
1711
1712         rules = calloc(1, sizeof(struct udev_rules));
1713         if (rules == NULL)
1714                 return NULL;
1715         rules->udev = udev;
1716         rules->resolve_names = resolve_names;
1717         udev_list_init(udev, &file_list, true);
1718
1719         /* init token array and string buffer */
1720         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1721         if (rules->tokens == NULL)
1722                 return udev_rules_unref(rules);
1723
1724         rules->token_max = PREALLOC_TOKEN;
1725
1726         rules->buf = malloc(PREALLOC_STRBUF);
1727         if (rules->buf == NULL)
1728                 return udev_rules_unref(rules);
1729
1730         rules->buf_max = PREALLOC_STRBUF;
1731         /* offset 0 is always '\0' */
1732         rules->buf[0] = '\0';
1733         rules->buf_cur = 1;
1734
1735         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1736         if (rules->trie_nodes == NULL)
1737                 return udev_rules_unref(rules);
1738
1739         rules->trie_nodes_max = PREALLOC_TRIE;
1740         /* offset 0 is the trie root, with an empty string */
1741         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1742         rules->trie_nodes_cur = 1;
1743
1744         rules->dirs = strv_new(SYSCONFDIR "/udev/rules.d",
1745                                "/run/udev/rules.d",
1746                                UDEVLIBEXECDIR "/rules.d",
1747                                NULL);
1748         if (!rules->dirs) {
1749                 log_error("failed to build config directory array");
1750                 return udev_rules_unref(rules);
1751         }
1752         if (!path_strv_canonicalize(rules->dirs)) {
1753                 log_error("failed to canonicalize config directories\n");
1754                 return udev_rules_unref(rules);
1755         }
1756         strv_uniq(rules->dirs);
1757
1758         rules->dirs_ts_usec = calloc(strv_length(rules->dirs), sizeof(long long));
1759         if(!rules->dirs_ts_usec)
1760                 return udev_rules_unref(rules);
1761         udev_rules_check_timestamp(rules);
1762
1763         r = conf_files_list_strv(&files, ".rules", (const char **)rules->dirs);
1764         if (r < 0) {
1765                 log_error("failed to enumerate rules files: %s\n", strerror(-r));
1766                 return udev_rules_unref(rules);
1767         }
1768
1769         /*
1770          * The offset value in the rules strct is limited; add all
1771          * rules file names to the beginning of the string buffer.
1772          */
1773         STRV_FOREACH(f, files)
1774                 add_string(rules, *f);
1775
1776         STRV_FOREACH(f, files)
1777                 parse_file(rules, *f);
1778
1779         strv_free(files);
1780
1781         memset(&end_token, 0x00, sizeof(struct token));
1782         end_token.type = TK_END;
1783         add_token(rules, &end_token);
1784
1785         /* shrink allocated token and string buffer */
1786         if (rules->token_cur < rules->token_max) {
1787                 struct token *tokens;
1788
1789                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1790                 if (tokens != NULL || rules->token_cur == 0) {
1791                         rules->tokens = tokens;
1792                         rules->token_max = rules->token_cur;
1793                 }
1794         }
1795         if (rules->buf_cur < rules->buf_max) {
1796                 char *buf;
1797
1798                 buf = realloc(rules->buf, rules->buf_cur);
1799                 if (buf != NULL || rules->buf_cur == 0) {
1800                         rules->buf = buf;
1801                         rules->buf_max = rules->buf_cur;
1802                 }
1803         }
1804         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1805                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1806         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1807                   rules->trie_nodes_cur * sizeof(struct trie_node),
1808                   rules->trie_nodes_cur, sizeof(struct trie_node));
1809
1810         /* cleanup trie */
1811         free(rules->trie_nodes);
1812         rules->trie_nodes = NULL;
1813         rules->trie_nodes_cur = 0;
1814         rules->trie_nodes_max = 0;
1815
1816         /* cleanup uid/gid cache */
1817         free(rules->uids);
1818         rules->uids = NULL;
1819         rules->uids_cur = 0;
1820         rules->uids_max = 0;
1821         free(rules->gids);
1822         rules->gids = NULL;
1823         rules->gids_cur = 0;
1824         rules->gids_max = 0;
1825
1826         dump_rules(rules);
1827         return rules;
1828 }
1829
1830 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1831 {
1832         if (rules == NULL)
1833                 return NULL;
1834         free(rules->tokens);
1835         free(rules->buf);
1836         free(rules->trie_nodes);
1837         free(rules->uids);
1838         free(rules->gids);
1839         strv_free(rules->dirs);
1840         free(rules->dirs_ts_usec);
1841         free(rules);
1842         return NULL;
1843 }
1844
1845 bool udev_rules_check_timestamp(struct udev_rules *rules)
1846 {
1847         unsigned int i;
1848         bool changed = false;
1849
1850         if (rules == NULL)
1851                 goto out;
1852
1853         for (i = 0; rules->dirs[i]; i++) {
1854                 struct stat stats;
1855
1856                 if (stat(rules->dirs[i], &stats) < 0)
1857                         continue;
1858
1859                 if (rules->dirs_ts_usec[i] == ts_usec(&stats.st_mtim))
1860                         continue;
1861
1862                 /* first check */
1863                 if (rules->dirs_ts_usec[i] != 0) {
1864                         log_debug("reload - timestamp of '%s' changed\n", rules->dirs[i]);
1865                         changed = true;
1866                 }
1867
1868                 /* update timestamp */
1869                 rules->dirs_ts_usec[i] = ts_usec(&stats.st_mtim);
1870         }
1871 out:
1872         return changed;
1873 }
1874
1875 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1876 {
1877         char *key_value = &rules->buf[token->key.value_off];
1878         char *pos;
1879         bool match = false;
1880
1881         if (val == NULL)
1882                 val = "";
1883
1884         switch (token->key.glob) {
1885         case GL_PLAIN:
1886                 match = (streq(key_value, val));
1887                 break;
1888         case GL_GLOB:
1889                 match = (fnmatch(key_value, val, 0) == 0);
1890                 break;
1891         case GL_SPLIT:
1892                 {
1893                         const char *s;
1894                         size_t len;
1895
1896                         s = &rules->buf[token->key.value_off];
1897                         len = strlen(val);
1898                         for (;;) {
1899                                 const char *next;
1900
1901                                 next = strchr(s, '|');
1902                                 if (next != NULL) {
1903                                         size_t matchlen = (size_t)(next - s);
1904
1905                                         match = (matchlen == len && strncmp(s, val, matchlen) == 0);
1906                                         if (match)
1907                                                 break;
1908                                 } else {
1909                                         match = (streq(s, val));
1910                                         break;
1911                                 }
1912                                 s = &next[1];
1913                         }
1914                         break;
1915                 }
1916         case GL_SPLIT_GLOB:
1917                 {
1918                         char value[UTIL_PATH_SIZE];
1919
1920                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1921                         key_value = value;
1922                         while (key_value != NULL) {
1923                                 pos = strchr(key_value, '|');
1924                                 if (pos != NULL) {
1925                                         pos[0] = '\0';
1926                                         pos = &pos[1];
1927                                 }
1928                                 match = (fnmatch(key_value, val, 0) == 0);
1929                                 if (match)
1930                                         break;
1931                                 key_value = pos;
1932                         }
1933                         break;
1934                 }
1935         case GL_SOMETHING:
1936                 match = (val[0] != '\0');
1937                 break;
1938         case GL_UNSET:
1939                 return -1;
1940         }
1941
1942         if (match && (token->key.op == OP_MATCH))
1943                 return 0;
1944         if (!match && (token->key.op == OP_NOMATCH))
1945                 return 0;
1946         return -1;
1947 }
1948
1949 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1950 {
1951         const char *name;
1952         char nbuf[UTIL_NAME_SIZE];
1953         const char *value;
1954         char vbuf[UTIL_NAME_SIZE];
1955         size_t len;
1956
1957         name = &rules->buf[cur->key.attr_off];
1958         switch (cur->key.attrsubst) {
1959         case SB_FORMAT:
1960                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1961                 name = nbuf;
1962                 /* fall through */
1963         case SB_NONE:
1964                 value = udev_device_get_sysattr_value(dev, name);
1965                 if (value == NULL)
1966                         return -1;
1967                 break;
1968         case SB_SUBSYS:
1969                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1970                         return -1;
1971                 value = vbuf;
1972                 break;
1973         default:
1974                 return -1;
1975         }
1976
1977         /* remove trailing whitespace, if not asked to match for it */
1978         len = strlen(value);
1979         if (len > 0 && isspace(value[len-1])) {
1980                 const char *key_value;
1981                 size_t klen;
1982
1983                 key_value = &rules->buf[cur->key.value_off];
1984                 klen = strlen(key_value);
1985                 if (klen > 0 && !isspace(key_value[klen-1])) {
1986                         if (value != vbuf) {
1987                                 util_strscpy(vbuf, sizeof(vbuf), value);
1988                                 value = vbuf;
1989                         }
1990                         while (len > 0 && isspace(vbuf[--len]))
1991                                 vbuf[len] = '\0';
1992                 }
1993         }
1994
1995         return match_key(rules, cur, value);
1996 }
1997
1998 enum escape_type {
1999         ESCAPE_UNSET,
2000         ESCAPE_NONE,
2001         ESCAPE_REPLACE,
2002 };
2003
2004 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2005 {
2006         struct token *cur;
2007         struct token *rule;
2008         enum escape_type esc = ESCAPE_UNSET;
2009         bool can_set_name;
2010
2011         if (rules->tokens == NULL)
2012                 return -1;
2013
2014         can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
2015                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2016                          udev_device_get_ifindex(event->dev) > 0));
2017
2018         /* loop through token list, match, run actions or forward to next rule */
2019         cur = &rules->tokens[0];
2020         rule = cur;
2021         for (;;) {
2022                 dump_token(rules, cur);
2023                 switch (cur->type) {
2024                 case TK_RULE:
2025                         /* current rule */
2026                         rule = cur;
2027                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2028                         if (!can_set_name && rule->rule.can_set_name)
2029                                 goto nomatch;
2030                         esc = ESCAPE_UNSET;
2031                         break;
2032                 case TK_M_ACTION:
2033                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2034                                 goto nomatch;
2035                         break;
2036                 case TK_M_DEVPATH:
2037                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2038                                 goto nomatch;
2039                         break;
2040                 case TK_M_KERNEL:
2041                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2042                                 goto nomatch;
2043                         break;
2044                 case TK_M_DEVLINK: {
2045                         struct udev_list_entry *list_entry;
2046                         bool match = false;
2047
2048                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2049                                 const char *devlink;
2050
2051                                 devlink =  udev_list_entry_get_name(list_entry) + strlen("/dev/");
2052                                 if (match_key(rules, cur, devlink) == 0) {
2053                                         match = true;
2054                                         break;
2055                                 }
2056                         }
2057                         if (!match)
2058                                 goto nomatch;
2059                         break;
2060                 }
2061                 case TK_M_NAME:
2062                         if (match_key(rules, cur, event->name) != 0)
2063                                 goto nomatch;
2064                         break;
2065                 case TK_M_ENV: {
2066                         const char *key_name = &rules->buf[cur->key.attr_off];
2067                         const char *value;
2068
2069                         value = udev_device_get_property_value(event->dev, key_name);
2070                         if (value == NULL)
2071                                 value = "";
2072                         if (match_key(rules, cur, value))
2073                                 goto nomatch;
2074                         break;
2075                 }
2076                 case TK_M_TAG: {
2077                         struct udev_list_entry *list_entry;
2078                         bool match = false;
2079
2080                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2081                                 if (streq(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry))) {
2082                                         match = true;
2083                                         break;
2084                                 }
2085                         }
2086                         if (!match && (cur->key.op != OP_NOMATCH))
2087                                 goto nomatch;
2088                         break;
2089                 }
2090                 case TK_M_SUBSYSTEM:
2091                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2092                                 goto nomatch;
2093                         break;
2094                 case TK_M_DRIVER:
2095                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2096                                 goto nomatch;
2097                         break;
2098                 case TK_M_WAITFOR: {
2099                         char filename[UTIL_PATH_SIZE];
2100                         int found;
2101
2102                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2103                         found = (wait_for_file(event->dev, filename, 10) == 0);
2104                         if (!found && (cur->key.op != OP_NOMATCH))
2105                                 goto nomatch;
2106                         break;
2107                 }
2108                 case TK_M_ATTR:
2109                         if (match_attr(rules, event->dev, event, cur) != 0)
2110                                 goto nomatch;
2111                         break;
2112                 case TK_M_KERNELS:
2113                 case TK_M_SUBSYSTEMS:
2114                 case TK_M_DRIVERS:
2115                 case TK_M_ATTRS:
2116                 case TK_M_TAGS: {
2117                         struct token *next;
2118
2119                         /* get whole sequence of parent matches */
2120                         next = cur;
2121                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2122                                 next++;
2123
2124                         /* loop over parents */
2125                         event->dev_parent = event->dev;
2126                         for (;;) {
2127                                 struct token *key;
2128
2129                                 /* loop over sequence of parent match keys */
2130                                 for (key = cur; key < next; key++ ) {
2131                                         dump_token(rules, key);
2132                                         switch(key->type) {
2133                                         case TK_M_KERNELS:
2134                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2135                                                         goto try_parent;
2136                                                 break;
2137                                         case TK_M_SUBSYSTEMS:
2138                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2139                                                         goto try_parent;
2140                                                 break;
2141                                         case TK_M_DRIVERS:
2142                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2143                                                         goto try_parent;
2144                                                 break;
2145                                         case TK_M_ATTRS:
2146                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2147                                                         goto try_parent;
2148                                                 break;
2149                                         case TK_M_TAGS: {
2150                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2151
2152                                                 if (match && key->key.op == OP_NOMATCH)
2153                                                         goto try_parent;
2154                                                 if (!match && key->key.op == OP_MATCH)
2155                                                         goto try_parent;
2156                                                 break;
2157                                         }
2158                                         default:
2159                                                 goto nomatch;
2160                                         }
2161                                 }
2162                                 break;
2163
2164                         try_parent:
2165                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2166                                 if (event->dev_parent == NULL)
2167                                         goto nomatch;
2168                         }
2169                         /* move behind our sequence of parent match keys */
2170                         cur = next;
2171                         continue;
2172                 }
2173                 case TK_M_TEST: {
2174                         char filename[UTIL_PATH_SIZE];
2175                         struct stat statbuf;
2176                         int match;
2177
2178                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2179                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2180                                 if (filename[0] != '/') {
2181                                         char tmp[UTIL_PATH_SIZE];
2182
2183                                         util_strscpy(tmp, sizeof(tmp), filename);
2184                                         util_strscpyl(filename, sizeof(filename),
2185                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2186                                 }
2187                         }
2188                         attr_subst_subdir(filename, sizeof(filename));
2189
2190                         match = (stat(filename, &statbuf) == 0);
2191                         if (match && cur->key.mode > 0)
2192                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2193                         if (match && cur->key.op == OP_NOMATCH)
2194                                 goto nomatch;
2195                         if (!match && cur->key.op == OP_MATCH)
2196                                 goto nomatch;
2197                         break;
2198                 }
2199                 case TK_M_EVENT_TIMEOUT:
2200                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2201                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2202                         break;
2203                 case TK_M_PROGRAM: {
2204                         char program[UTIL_PATH_SIZE];
2205                         char **envp;
2206                         char result[UTIL_PATH_SIZE];
2207
2208                         free(event->program_result);
2209                         event->program_result = NULL;
2210                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2211                         envp = udev_device_get_properties_envp(event->dev);
2212                         log_debug("PROGRAM '%s' %s:%u\n",
2213                                   program,
2214                                   &rules->buf[rule->rule.filename_off],
2215                                   rule->rule.filename_line);
2216
2217                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2218                                 if (cur->key.op != OP_NOMATCH)
2219                                         goto nomatch;
2220                         } else {
2221                                 int count;
2222
2223                                 util_remove_trailing_chars(result, '\n');
2224                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2225                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2226                                         if (count > 0)
2227                                                 log_debug("%i character(s) replaced\n" , count);
2228                                 }
2229                                 event->program_result = strdup(result);
2230                                 if (cur->key.op == OP_NOMATCH)
2231                                         goto nomatch;
2232                         }
2233                         break;
2234                 }
2235                 case TK_M_IMPORT_FILE: {
2236                         char import[UTIL_PATH_SIZE];
2237
2238                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2239                         if (import_file_into_properties(event->dev, import) != 0)
2240                                 if (cur->key.op != OP_NOMATCH)
2241                                         goto nomatch;
2242                         break;
2243                 }
2244                 case TK_M_IMPORT_PROG: {
2245                         char import[UTIL_PATH_SIZE];
2246
2247                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2248                         log_debug("IMPORT '%s' %s:%u\n",
2249                                   import,
2250                                   &rules->buf[rule->rule.filename_off],
2251                                   rule->rule.filename_line);
2252
2253                         if (import_program_into_properties(event, import, sigmask) != 0)
2254                                 if (cur->key.op != OP_NOMATCH)
2255                                         goto nomatch;
2256                         break;
2257                 }
2258                 case TK_M_IMPORT_BUILTIN: {
2259                         char command[UTIL_PATH_SIZE];
2260
2261                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2262                                 /* check if we ran already */
2263                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2264                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2265                                                   udev_builtin_name(cur->key.builtin_cmd),
2266                                                   &rules->buf[rule->rule.filename_off],
2267                                                   rule->rule.filename_line);
2268                                         /* return the result from earlier run */
2269                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2270                                         if (cur->key.op != OP_NOMATCH)
2271                                                         goto nomatch;
2272                                         break;
2273                                 }
2274                                 /* mark as ran */
2275                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2276                         }
2277
2278                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2279                         log_debug("IMPORT builtin '%s' %s:%u\n",
2280                                   udev_builtin_name(cur->key.builtin_cmd),
2281                                   &rules->buf[rule->rule.filename_off],
2282                                   rule->rule.filename_line);
2283
2284                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2285                                 /* remember failure */
2286                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2287                                           udev_builtin_name(cur->key.builtin_cmd));
2288                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2289                                 if (cur->key.op != OP_NOMATCH)
2290                                         goto nomatch;
2291                         }
2292                         break;
2293                 }
2294                 case TK_M_IMPORT_DB: {
2295                         const char *key = &rules->buf[cur->key.value_off];
2296                         const char *value;
2297
2298                         value = udev_device_get_property_value(event->dev_db, key);
2299                         if (value != NULL) {
2300                                 struct udev_list_entry *entry;
2301
2302                                 entry = udev_device_add_property(event->dev, key, value);
2303                                 udev_list_entry_set_num(entry, true);
2304                         } else {
2305                                 if (cur->key.op != OP_NOMATCH)
2306                                         goto nomatch;
2307                         }
2308                         break;
2309                 }
2310                 case TK_M_IMPORT_CMDLINE: {
2311                         FILE *f;
2312                         bool imported = false;
2313
2314                         f = fopen("/proc/cmdline", "re");
2315                         if (f != NULL) {
2316                                 char cmdline[4096];
2317
2318                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2319                                         const char *key = &rules->buf[cur->key.value_off];
2320                                         char *pos;
2321
2322                                         pos = strstr(cmdline, key);
2323                                         if (pos != NULL) {
2324                                                 struct udev_list_entry *entry;
2325
2326                                                 pos += strlen(key);
2327                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2328                                                         /* we import simple flags as 'FLAG=1' */
2329                                                         entry = udev_device_add_property(event->dev, key, "1");
2330                                                         udev_list_entry_set_num(entry, true);
2331                                                         imported = true;
2332                                                 } else if (pos[0] == '=') {
2333                                                         const char *value;
2334
2335                                                         pos++;
2336                                                         value = pos;
2337                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2338                                                                 pos++;
2339                                                         pos[0] = '\0';
2340                                                         entry = udev_device_add_property(event->dev, key, value);
2341                                                         udev_list_entry_set_num(entry, true);
2342                                                         imported = true;
2343                                                 }
2344                                         }
2345                                 }
2346                                 fclose(f);
2347                         }
2348                         if (!imported && cur->key.op != OP_NOMATCH)
2349                                 goto nomatch;
2350                         break;
2351                 }
2352                 case TK_M_IMPORT_PARENT: {
2353                         char import[UTIL_PATH_SIZE];
2354
2355                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2356                         if (import_parent_into_properties(event->dev, import) != 0)
2357                                 if (cur->key.op != OP_NOMATCH)
2358                                         goto nomatch;
2359                         break;
2360                 }
2361                 case TK_M_RESULT:
2362                         if (match_key(rules, cur, event->program_result) != 0)
2363                                 goto nomatch;
2364                         break;
2365                 case TK_A_STRING_ESCAPE_NONE:
2366                         esc = ESCAPE_NONE;
2367                         break;
2368                 case TK_A_STRING_ESCAPE_REPLACE:
2369                         esc = ESCAPE_REPLACE;
2370                         break;
2371                 case TK_A_DB_PERSIST:
2372                         udev_device_set_db_persist(event->dev);
2373                         break;
2374                 case TK_A_INOTIFY_WATCH:
2375                         if (event->inotify_watch_final)
2376                                 break;
2377                         if (cur->key.op == OP_ASSIGN_FINAL)
2378                                 event->inotify_watch_final = true;
2379                         event->inotify_watch = cur->key.watch;
2380                         break;
2381                 case TK_A_DEVLINK_PRIO:
2382                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2383                         break;
2384                 case TK_A_OWNER: {
2385                         char owner[UTIL_NAME_SIZE];
2386
2387                         if (event->owner_final)
2388                                 break;
2389                         if (cur->key.op == OP_ASSIGN_FINAL)
2390                                 event->owner_final = true;
2391                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2392                         event->uid = util_lookup_user(event->udev, owner);
2393                         log_debug("OWNER %u %s:%u\n",
2394                                   event->uid,
2395                                   &rules->buf[rule->rule.filename_off],
2396                                   rule->rule.filename_line);
2397                         break;
2398                 }
2399                 case TK_A_GROUP: {
2400                         char group[UTIL_NAME_SIZE];
2401
2402                         if (event->group_final)
2403                                 break;
2404                         if (cur->key.op == OP_ASSIGN_FINAL)
2405                                 event->group_final = true;
2406                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2407                         event->gid = util_lookup_group(event->udev, group);
2408                         log_debug("GROUP %u %s:%u\n",
2409                                   event->gid,
2410                                   &rules->buf[rule->rule.filename_off],
2411                                   rule->rule.filename_line);
2412                         break;
2413                 }
2414                 case TK_A_MODE: {
2415                         char mode_str[UTIL_NAME_SIZE];
2416                         mode_t mode;
2417                         char *endptr;
2418
2419                         if (event->mode_final)
2420                                 break;
2421                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2422                         mode = strtol(mode_str, &endptr, 8);
2423                         if (endptr[0] != '\0') {
2424                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2425                                 break;
2426                         }
2427                         if (cur->key.op == OP_ASSIGN_FINAL)
2428                                 event->mode_final = true;
2429                         event->mode_set = true;
2430                         event->mode = mode;
2431                         log_debug("MODE %#o %s:%u\n",
2432                                   event->mode,
2433                                   &rules->buf[rule->rule.filename_off],
2434                                   rule->rule.filename_line);
2435                         break;
2436                 }
2437                 case TK_A_OWNER_ID:
2438                         if (event->owner_final)
2439                                 break;
2440                         if (cur->key.op == OP_ASSIGN_FINAL)
2441                                 event->owner_final = true;
2442                         event->uid = cur->key.uid;
2443                         log_debug("OWNER %u %s:%u\n",
2444                                   event->uid,
2445                                   &rules->buf[rule->rule.filename_off],
2446                                   rule->rule.filename_line);
2447                         break;
2448                 case TK_A_GROUP_ID:
2449                         if (event->group_final)
2450                                 break;
2451                         if (cur->key.op == OP_ASSIGN_FINAL)
2452                                 event->group_final = true;
2453                         event->gid = cur->key.gid;
2454                         log_debug("GROUP %u %s:%u\n",
2455                                   event->gid,
2456                                   &rules->buf[rule->rule.filename_off],
2457                                   rule->rule.filename_line);
2458                         break;
2459                 case TK_A_MODE_ID:
2460                         if (event->mode_final)
2461                                 break;
2462                         if (cur->key.op == OP_ASSIGN_FINAL)
2463                                 event->mode_final = true;
2464                         event->mode_set = true;
2465                         event->mode = cur->key.mode;
2466                         log_debug("MODE %#o %s:%u\n",
2467                                   event->mode,
2468                                   &rules->buf[rule->rule.filename_off],
2469                                   rule->rule.filename_line);
2470                         break;
2471                 case TK_A_ENV: {
2472                         const char *name = &rules->buf[cur->key.attr_off];
2473                         char *value = &rules->buf[cur->key.value_off];
2474
2475                         if (value[0] != '\0') {
2476                                 char temp_value[UTIL_NAME_SIZE];
2477                                 struct udev_list_entry *entry;
2478
2479                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2480                                 entry = udev_device_add_property(event->dev, name, temp_value);
2481                                 /* store in db, skip private keys */
2482                                 if (name[0] != '.')
2483                                         udev_list_entry_set_num(entry, true);
2484                         } else {
2485                                 udev_device_add_property(event->dev, name, NULL);
2486                         }
2487                         break;
2488                 }
2489                 case TK_A_TAG: {
2490                         char tag[UTIL_PATH_SIZE];
2491                         const char *p;
2492
2493                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2494                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2495                                 udev_device_cleanup_tags_list(event->dev);
2496                         for (p = tag; *p != '\0'; p++) {
2497                                 if ((*p >= 'a' && *p <= 'z') ||
2498                                     (*p >= 'A' && *p <= 'Z') ||
2499                                     (*p >= '0' && *p <= '9') ||
2500                                     *p == '-' || *p == '_')
2501                                         continue;
2502                                 log_error("ignoring invalid tag name '%s'\n", tag);
2503                                 break;
2504                         }
2505                         udev_device_add_tag(event->dev, tag);
2506                         break;
2507                 }
2508                 case TK_A_NAME: {
2509                         const char *name  = &rules->buf[cur->key.value_off];
2510
2511                         char name_str[UTIL_PATH_SIZE];
2512                         int count;
2513
2514                         if (event->name_final)
2515                                 break;
2516                         if (cur->key.op == OP_ASSIGN_FINAL)
2517                                 event->name_final = true;
2518                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2519                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2520                                 count = util_replace_chars(name_str, "/");
2521                                 if (count > 0)
2522                                         log_debug("%i character(s) replaced\n", count);
2523                         }
2524                         if (major(udev_device_get_devnum(event->dev)) &&
2525                             (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2526                                 log_error("NAME=\"%s\" ignored, kernel device nodes "
2527                                     "can not be renamed; please fix it in %s:%u\n", name,
2528                                     &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2529                                 break;
2530                         }
2531                         free(event->name);
2532                         event->name = strdup(name_str);
2533                         log_debug("NAME '%s' %s:%u\n",
2534                                   event->name,
2535                                   &rules->buf[rule->rule.filename_off],
2536                                   rule->rule.filename_line);
2537                         break;
2538                 }
2539                 case TK_A_DEVLINK: {
2540                         char temp[UTIL_PATH_SIZE];
2541                         char filename[UTIL_PATH_SIZE];
2542                         char *pos, *next;
2543                         int count = 0;
2544
2545                         if (event->devlink_final)
2546                                 break;
2547                         if (major(udev_device_get_devnum(event->dev)) == 0)
2548                                 break;
2549                         if (cur->key.op == OP_ASSIGN_FINAL)
2550                                 event->devlink_final = true;
2551                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2552                                 udev_device_cleanup_devlinks_list(event->dev);
2553
2554                         /* allow  multiple symlinks separated by spaces */
2555                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2556                         if (esc == ESCAPE_UNSET)
2557                                 count = util_replace_chars(temp, "/ ");
2558                         else if (esc == ESCAPE_REPLACE)
2559                                 count = util_replace_chars(temp, "/");
2560                         if (count > 0)
2561                                 log_debug("%i character(s) replaced\n" , count);
2562                         pos = temp;
2563                         while (isspace(pos[0]))
2564                                 pos++;
2565                         next = strchr(pos, ' ');
2566                         while (next != NULL) {
2567                                 next[0] = '\0';
2568                                 log_debug("LINK '%s' %s:%u\n", pos,
2569                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2570                                 util_strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2571                                 udev_device_add_devlink(event->dev, filename);
2572                                 while (isspace(next[1]))
2573                                         next++;
2574                                 pos = &next[1];
2575                                 next = strchr(pos, ' ');
2576                         }
2577                         if (pos[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);
2582                         }
2583                         break;
2584                 }
2585                 case TK_A_ATTR: {
2586                         const char *key_name = &rules->buf[cur->key.attr_off];
2587                         char attr[UTIL_PATH_SIZE];
2588                         char value[UTIL_NAME_SIZE];
2589                         FILE *f;
2590
2591                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2592                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2593                         attr_subst_subdir(attr, sizeof(attr));
2594
2595                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2596                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2597                                   &rules->buf[rule->rule.filename_off],
2598                                   rule->rule.filename_line);
2599                         f = fopen(attr, "we");
2600                         if (f != NULL) {
2601                                 if (fprintf(f, "%s", value) <= 0)
2602                                         log_error("error writing ATTR{%s}: %m\n", attr);
2603                                 fclose(f);
2604                         } else {
2605                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2606                         }
2607                         break;
2608                 }
2609                 case TK_A_RUN_BUILTIN:
2610                 case TK_A_RUN_PROGRAM: {
2611                         struct udev_list_entry *entry;
2612
2613                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2614                                 udev_list_cleanup(&event->run_list);
2615                         log_debug("RUN '%s' %s:%u\n",
2616                                   &rules->buf[cur->key.value_off],
2617                                   &rules->buf[rule->rule.filename_off],
2618                                   rule->rule.filename_line);
2619                         entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2620                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2621                         break;
2622                 }
2623                 case TK_A_GOTO:
2624                         if (cur->key.rule_goto == 0)
2625                                 break;
2626                         cur = &rules->tokens[cur->key.rule_goto];
2627                         continue;
2628                 case TK_END:
2629                         return 0;
2630
2631                 case TK_M_PARENTS_MIN:
2632                 case TK_M_PARENTS_MAX:
2633                 case TK_M_MAX:
2634                 case TK_UNSET:
2635                         log_error("wrong type %u\n", cur->type);
2636                         goto nomatch;
2637                 }
2638
2639                 cur++;
2640                 continue;
2641         nomatch:
2642                 /* fast-forward to next rule */
2643                 cur = rule + rule->rule.token_count;
2644         }
2645 }
2646
2647 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2648 {
2649         struct token *cur;
2650         struct token *rule;
2651         uid_t uid = 0;
2652         gid_t gid = 0;
2653         mode_t mode = 0;
2654
2655         if (rules->tokens == NULL)
2656                 return;
2657
2658         cur = &rules->tokens[0];
2659         rule = cur;
2660         for (;;) {
2661                 switch (cur->type) {
2662                 case TK_RULE:
2663                         /* current rule */
2664                         rule = cur;
2665
2666                         /* skip rules without a static_node tag */
2667                         if (!rule->rule.has_static_node)
2668                                 goto next;
2669
2670                         uid = 0;
2671                         gid = 0;
2672                         mode = 0;
2673                         break;
2674                 case TK_A_OWNER_ID:
2675                         uid = cur->key.uid;
2676                         break;
2677                 case TK_A_GROUP_ID:
2678                         gid = cur->key.gid;
2679                         break;
2680                 case TK_A_MODE_ID:
2681                         mode = cur->key.mode;
2682                         break;
2683                 case TK_A_STATIC_NODE: {
2684                         char filename[UTIL_PATH_SIZE];
2685                         struct stat stats;
2686
2687                         /* we assure, that the permissions tokens are sorted before the static token */
2688                         if (mode == 0 && uid == 0 && gid == 0)
2689                                 goto next;
2690                         util_strscpyl(filename, sizeof(filename), "/dev/",
2691                                       &rules->buf[cur->key.value_off], NULL);
2692                         if (stat(filename, &stats) != 0)
2693                                 goto next;
2694                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2695                                 goto next;
2696                         if (mode == 0) {
2697                                 if (gid > 0)
2698                                         mode = 0660;
2699                                 else
2700                                         mode = 0600;
2701                         }
2702                         if (mode != (stats.st_mode & 01777)) {
2703                                 chmod(filename, mode);
2704                                 log_debug("chmod '%s' %#o\n", filename, mode);
2705                         }
2706
2707                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2708                                 chown(filename, uid, gid);
2709                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2710                         }
2711
2712                         utimensat(AT_FDCWD, filename, NULL, 0);
2713                         break;
2714                 }
2715                 case TK_END:
2716                         return;
2717                 }
2718
2719                 cur++;
2720                 continue;
2721 next:
2722                 /* fast-forward to next rule */
2723                 cur = rule + rule->rule.token_count;
2724                 continue;
2725         }
2726 }