src/udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stddef.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <stdbool.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <fnmatch.h>
  31 #include <time.h>
  32
  33 #include "udev.h"
  34
  35 #define PREALLOC_TOKEN          2048
  36 #define PREALLOC_STRBUF         32 * 1024
  37 #define PREALLOC_TRIE           256
  38
  39 struct uid_gid {
  40         unsigned int name_off;
  41         union {
  42                 uid_t uid;
  43                 gid_t gid;
  44         };
  45 };
  46
  47 struct trie_node {
  48         /* this node's first child */
  49         unsigned int child_idx;
  50         /* the next child of our parent node's child list */
  51         unsigned int next_child_idx;
  52         /* this node's last child (shortcut for append) */
  53         unsigned int last_child_idx;
  54         unsigned int value_off;
  55         unsigned short value_len;
  56         unsigned char key;
  57 };
  58
  59 struct udev_rules {
  60         struct udev *udev;
  61         int resolve_names;
  62
  63         /* every key in the rules file becomes a token */
  64         struct token *tokens;
  65         unsigned int token_cur;
  66         unsigned int token_max;
  67
  68         /* all key strings are copied to a single string buffer */
  69         char *buf;
  70         size_t buf_cur;
  71         size_t buf_max;
  72         unsigned int buf_count;
  73
  74         /* during rule parsing, strings are indexed to find duplicates */
  75         struct trie_node *trie_nodes;
  76         unsigned int trie_nodes_cur;
  77         unsigned int trie_nodes_max;
  78
  79         /* during rule parsing, uid/gid lookup results are cached */
  80         struct uid_gid *uids;
  81         unsigned int uids_cur;
  82         unsigned int uids_max;
  83         struct uid_gid *gids;
  84         unsigned int gids_cur;
  85         unsigned int gids_max;
  86 };
  87
  88 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  89 enum operation_type {
  90         OP_UNSET,
  91
  92         OP_MATCH,
  93         OP_NOMATCH,
  94         OP_MATCH_MAX,
  95
  96         OP_ADD,
  97         OP_ASSIGN,
  98         OP_ASSIGN_FINAL,
  99 };
 100
 101 enum string_glob_type {
 102         GL_UNSET,
 103         GL_PLAIN,                       /* no special chars */
 104         GL_GLOB,                        /* shell globs ?,*,[] */
 105         GL_SPLIT,                       /* multi-value A|B */
 106         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 107         GL_SOMETHING,                   /* commonly used "?*" */
 108 };
 109
 110 enum string_subst_type {
 111         SB_UNSET,
 112         SB_NONE,
 113         SB_FORMAT,
 114         SB_SUBSYS,
 115 };
 116
 117 /* tokens of a rule are sorted/handled in this order */
 118 enum token_type {
 119         TK_UNSET,
 120         TK_RULE,
 121
 122         TK_M_ACTION,                    /* val */
 123         TK_M_DEVPATH,                   /* val */
 124         TK_M_KERNEL,                    /* val */
 125         TK_M_DEVLINK,                   /* val */
 126         TK_M_NAME,                      /* val */
 127         TK_M_ENV,                       /* val, attr */
 128         TK_M_TAG,                       /* val */
 129         TK_M_SUBSYSTEM,                 /* val */
 130         TK_M_DRIVER,                    /* val */
 131         TK_M_WAITFOR,                   /* val */
 132         TK_M_ATTR,                      /* val, attr */
 133
 134         TK_M_PARENTS_MIN,
 135         TK_M_KERNELS,                   /* val */
 136         TK_M_SUBSYSTEMS,                /* val */
 137         TK_M_DRIVERS,                   /* val */
 138         TK_M_ATTRS,                     /* val, attr */
 139         TK_M_TAGS,                      /* val */
 140         TK_M_PARENTS_MAX,
 141
 142         TK_M_TEST,                      /* val, mode_t */
 143         TK_M_EVENT_TIMEOUT,             /* int */
 144         TK_M_PROGRAM,                   /* val */
 145         TK_M_IMPORT_FILE,               /* val */
 146         TK_M_IMPORT_PROG,               /* val */
 147         TK_M_IMPORT_BUILTIN,            /* val */
 148         TK_M_IMPORT_DB,                 /* val */
 149         TK_M_IMPORT_CMDLINE,            /* val */
 150         TK_M_IMPORT_PARENT,             /* val */
 151         TK_M_RESULT,                    /* val */
 152         TK_M_MAX,
 153
 154         TK_A_STRING_ESCAPE_NONE,
 155         TK_A_STRING_ESCAPE_REPLACE,
 156         TK_A_DB_PERSIST,
 157         TK_A_INOTIFY_WATCH,             /* int */
 158         TK_A_DEVLINK_PRIO,              /* int */
 159         TK_A_OWNER,                     /* val */
 160         TK_A_GROUP,                     /* val */
 161         TK_A_MODE,                      /* val */
 162         TK_A_OWNER_ID,                  /* uid_t */
 163         TK_A_GROUP_ID,                  /* gid_t */
 164         TK_A_MODE_ID,                   /* mode_t */
 165         TK_A_STATIC_NODE,               /* val */
 166         TK_A_ENV,                       /* val, attr */
 167         TK_A_TAG,                       /* val */
 168         TK_A_NAME,                      /* val */
 169         TK_A_DEVLINK,                   /* val */
 170         TK_A_ATTR,                      /* val, attr */
 171         TK_A_RUN_BUILTIN,               /* val, bool */
 172         TK_A_RUN_PROGRAM,               /* val, bool */
 173         TK_A_GOTO,                      /* size_t */
 174
 175         TK_END,
 176 };
 177
 178 /* we try to pack stuff in a way that we take only 12 bytes per token */
 179 struct token {
 180         union {
 181                 unsigned char type;                /* same in rule and key */
 182                 struct {
 183                         enum token_type type:8;
 184                         bool can_set_name:1;
 185                         bool has_static_node:1;
 186                         unsigned int unused:6;
 187                         unsigned short token_count;
 188                         unsigned int label_off;
 189                         unsigned short filename_off;
 190                         unsigned short filename_line;
 191                 } rule;
 192                 struct {
 193                         enum token_type type:8;
 194                         enum operation_type op:8;
 195                         enum string_glob_type glob:8;
 196                         enum string_subst_type subst:4;
 197                         enum string_subst_type attrsubst:4;
 198                         unsigned int value_off;
 199                         union {
 200                                 unsigned int attr_off;
 201                                 int devlink_unique;
 202                                 unsigned int rule_goto;
 203                                 mode_t  mode;
 204                                 uid_t uid;
 205                                 gid_t gid;
 206                                 int devlink_prio;
 207                                 int event_timeout;
 208                                 int watch;
 209                                 enum udev_builtin_cmd builtin_cmd;
 210                         };
 211                 } key;
 212         };
 213 };
 214
 215 #define MAX_TK                64
 216 struct rule_tmp {
 217         struct udev_rules *rules;
 218         struct token rule;
 219         struct token token[MAX_TK];
 220         unsigned int token_cur;
 221 };
 222
 223 #ifdef DEBUG
 224 static const char *operation_str(enum operation_type type)
 225 {
 226         static const char *operation_strs[] = {
 227                 [OP_UNSET] =            "UNSET",
 228                 [OP_MATCH] =            "match",
 229                 [OP_NOMATCH] =          "nomatch",
 230                 [OP_MATCH_MAX] =        "MATCH_MAX",
 231
 232                 [OP_ADD] =              "add",
 233                 [OP_ASSIGN] =           "assign",
 234                 [OP_ASSIGN_FINAL] =     "assign-final",
 235 }        ;
 236
 237         return operation_strs[type];
 238 }
 239
 240 static const char *string_glob_str(enum string_glob_type type)
 241 {
 242         static const char *string_glob_strs[] = {
 243                 [GL_UNSET] =            "UNSET",
 244                 [GL_PLAIN] =            "plain",
 245                 [GL_GLOB] =             "glob",
 246                 [GL_SPLIT] =            "split",
 247                 [GL_SPLIT_GLOB] =       "split-glob",
 248                 [GL_SOMETHING] =        "split-glob",
 249         };
 250
 251         return string_glob_strs[type];
 252 }
 253
 254 static const char *token_str(enum token_type type)
 255 {
 256         static const char *token_strs[] = {
 257                 [TK_UNSET] =                    "UNSET",
 258                 [TK_RULE] =                     "RULE",
 259
 260                 [TK_M_ACTION] =                 "M ACTION",
 261                 [TK_M_DEVPATH] =                "M DEVPATH",
 262                 [TK_M_KERNEL] =                 "M KERNEL",
 263                 [TK_M_DEVLINK] =                "M DEVLINK",
 264                 [TK_M_NAME] =                   "M NAME",
 265                 [TK_M_ENV] =                    "M ENV",
 266                 [TK_M_TAG] =                    "M TAG",
 267                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 268                 [TK_M_DRIVER] =                 "M DRIVER",
 269                 [TK_M_WAITFOR] =                "M WAITFOR",
 270                 [TK_M_ATTR] =                   "M ATTR",
 271
 272                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 273                 [TK_M_KERNELS] =                "M KERNELS",
 274                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 275                 [TK_M_DRIVERS] =                "M DRIVERS",
 276                 [TK_M_ATTRS] =                  "M ATTRS",
 277                 [TK_M_TAGS] =                   "M TAGS",
 278                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 279
 280                 [TK_M_TEST] =                   "M TEST",
 281                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 282                 [TK_M_PROGRAM] =                "M PROGRAM",
 283                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 284                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 285                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 286                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 287                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 288                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 289                 [TK_M_RESULT] =                 "M RESULT",
 290                 [TK_M_MAX] =                    "M MAX",
 291
 292                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 293                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 294                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 295                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 296                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 297                 [TK_A_OWNER] =                  "A OWNER",
 298                 [TK_A_GROUP] =                  "A GROUP",
 299                 [TK_A_MODE] =                   "A MODE",
 300                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 301                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 302                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 303                 [TK_A_MODE_ID] =                "A MODE_ID",
 304                 [TK_A_ENV] =                    "A ENV",
 305                 [TK_A_TAG] =                    "A ENV",
 306                 [TK_A_NAME] =                   "A NAME",
 307                 [TK_A_DEVLINK] =                "A DEVLINK",
 308                 [TK_A_ATTR] =                   "A ATTR",
 309                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 310                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 311                 [TK_A_GOTO] =                   "A GOTO",
 312
 313                 [TK_END] =                      "END",
 314         };
 315
 316         return token_strs[type];
 317 }
 318
 319 static void dump_token(struct udev_rules *rules, struct token *token)
 320 {
 321         enum token_type type = token->type;
 322         enum operation_type op = token->key.op;
 323         enum string_glob_type glob = token->key.glob;
 324         const char *value = &rules->buf[token->key.value_off];
 325         const char *attr = &rules->buf[token->key.attr_off];
 326
 327         switch (type) {
 328         case TK_RULE:
 329                 {
 330                         const char *tks_ptr = (char *)rules->tokens;
 331                         const char *tk_ptr = (char *)token;
 332                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 333
 334                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 335                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 336                                   idx, token->rule.token_count,
 337                                   &rules->buf[token->rule.label_off]);
 338                         break;
 339                 }
 340         case TK_M_ACTION:
 341         case TK_M_DEVPATH:
 342         case TK_M_KERNEL:
 343         case TK_M_SUBSYSTEM:
 344         case TK_M_DRIVER:
 345         case TK_M_WAITFOR:
 346         case TK_M_DEVLINK:
 347         case TK_M_NAME:
 348         case TK_M_KERNELS:
 349         case TK_M_SUBSYSTEMS:
 350         case TK_M_DRIVERS:
 351         case TK_M_TAGS:
 352         case TK_M_PROGRAM:
 353         case TK_M_IMPORT_FILE:
 354         case TK_M_IMPORT_PROG:
 355         case TK_M_IMPORT_DB:
 356         case TK_M_IMPORT_CMDLINE:
 357         case TK_M_IMPORT_PARENT:
 358         case TK_M_RESULT:
 359         case TK_A_NAME:
 360         case TK_A_DEVLINK:
 361         case TK_A_OWNER:
 362         case TK_A_GROUP:
 363         case TK_A_MODE:
 364         case TK_A_RUN_BUILTIN:
 365         case TK_A_RUN_PROGRAM:
 366                 log_debug("%s %s '%s'(%s)\n",
 367                           token_str(type), operation_str(op), value, string_glob_str(glob));
 368                 break;
 369         case TK_M_IMPORT_BUILTIN:
 370                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 371                 break;
 372         case TK_M_ATTR:
 373         case TK_M_ATTRS:
 374         case TK_M_ENV:
 375         case TK_A_ATTR:
 376         case TK_A_ENV:
 377                 log_debug("%s %s '%s' '%s'(%s)\n",
 378                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 379                 break;
 380         case TK_M_TAG:
 381         case TK_A_TAG:
 382                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 383                 break;
 384         case TK_A_STRING_ESCAPE_NONE:
 385         case TK_A_STRING_ESCAPE_REPLACE:
 386         case TK_A_DB_PERSIST:
 387                 log_debug("%s\n", token_str(type));
 388                 break;
 389         case TK_M_TEST:
 390                 log_debug("%s %s '%s'(%s) %#o\n",
 391                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 392                 break;
 393         case TK_A_INOTIFY_WATCH:
 394                 log_debug("%s %u\n", token_str(type), token->key.watch);
 395                 break;
 396         case TK_A_DEVLINK_PRIO:
 397                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 398                 break;
 399         case TK_A_OWNER_ID:
 400                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 401                 break;
 402         case TK_A_GROUP_ID:
 403                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 404                 break;
 405         case TK_A_MODE_ID:
 406                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 407                 break;
 408         case TK_A_STATIC_NODE:
 409                 log_debug("%s '%s'\n", token_str(type), value);
 410                 break;
 411         case TK_M_EVENT_TIMEOUT:
 412                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 413                 break;
 414         case TK_A_GOTO:
 415                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 416                 break;
 417         case TK_END:
 418                 log_debug("* %s\n", token_str(type));
 419                 break;
 420         case TK_M_PARENTS_MIN:
 421         case TK_M_PARENTS_MAX:
 422         case TK_M_MAX:
 423         case TK_UNSET:
 424                 log_debug("unknown type %u\n", type);
 425                 break;
 426         }
 427 }
 428
 429 static void dump_rules(struct udev_rules *rules)
 430 {
 431         unsigned int i;
 432
 433         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 434                   rules->token_cur,
 435                   rules->token_cur * sizeof(struct token),
 436                   rules->buf_count,
 437                   rules->buf_cur);
 438         for(i = 0; i < rules->token_cur; i++)
 439                 dump_token(rules, &rules->tokens[i]);
 440 }
 441 #else
 442 static inline const char *operation_str(enum operation_type type) { return NULL; }
 443 static inline const char *token_str(enum token_type type) { return NULL; }
 444 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 445 static inline void dump_rules(struct udev_rules *rules) {}
 446 #endif /* DEBUG */
 447
 448 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 449 {
 450         int off;
 451
 452         /* grow buffer if needed */
 453         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 454                 char *buf;
 455                 unsigned int add;
 456
 457                 /* double the buffer size */
 458                 add = rules->buf_max;
 459                 if (add < bytes * 8)
 460                         add = bytes * 8;
 461
 462                 buf = realloc(rules->buf, rules->buf_max + add);
 463                 if (buf == NULL)
 464                         return -1;
 465                 rules->buf = buf;
 466                 rules->buf_max += add;
 467         }
 468         off = rules->buf_cur;
 469         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 470         rules->buf_cur += bytes;
 471         rules->buf_count++;
 472         return off;
 473 }
 474
 475 static int add_string(struct udev_rules *rules, const char *str)
 476 {
 477         unsigned int node_idx;
 478         struct trie_node *new_node;
 479         unsigned int new_node_idx;
 480         unsigned char key;
 481         unsigned short len;
 482         unsigned int depth;
 483         unsigned int off;
 484         struct trie_node *parent;
 485
 486         /* walk trie, start from last character of str to find matching tails */
 487         len = strlen(str);
 488         key = str[len-1];
 489         node_idx = 0;
 490         for (depth = 0; depth <= len; depth++) {
 491                 struct trie_node *node;
 492                 unsigned int child_idx;
 493
 494                 node = &rules->trie_nodes[node_idx];
 495                 off = node->value_off + node->value_len - len;
 496
 497                 /* match against current node */
 498                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 499                         return off;
 500
 501                 /* lookup child node */
 502                 key = str[len - 1 - depth];
 503                 child_idx = node->child_idx;
 504                 while (child_idx > 0) {
 505                         struct trie_node *child;
 506
 507                         child = &rules->trie_nodes[child_idx];
 508                         if (child->key == key)
 509                                 break;
 510                         child_idx = child->next_child_idx;
 511                 }
 512                 if (child_idx == 0)
 513                         break;
 514                 node_idx = child_idx;
 515         }
 516
 517         /* string not found, add it */
 518         off = add_new_string(rules, str, len + 1);
 519
 520         /* grow trie nodes if needed */
 521         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 522                 struct trie_node *nodes;
 523                 unsigned int add;
 524
 525                 /* double the buffer size */
 526                 add = rules->trie_nodes_max;
 527                 if (add < 8)
 528                         add = 8;
 529
 530                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 531                 if (nodes == NULL)
 532                         return -1;
 533                 rules->trie_nodes = nodes;
 534                 rules->trie_nodes_max += add;
 535         }
 536
 537         /* get a new node */
 538         new_node_idx = rules->trie_nodes_cur;
 539         rules->trie_nodes_cur++;
 540         new_node = &rules->trie_nodes[new_node_idx];
 541         memset(new_node, 0x00, sizeof(struct trie_node));
 542         new_node->value_off = off;
 543         new_node->value_len = len;
 544         new_node->key = key;
 545
 546         /* join the parent's child list */
 547         parent = &rules->trie_nodes[node_idx];
 548         if (parent->child_idx == 0) {
 549                 parent->child_idx = new_node_idx;
 550         } else {
 551                 struct trie_node *last_child;
 552
 553                 last_child = &rules->trie_nodes[parent->last_child_idx];
 554                 last_child->next_child_idx = new_node_idx;
 555         }
 556         parent->last_child_idx = new_node_idx;
 557         return off;
 558 }
 559
 560 static int add_token(struct udev_rules *rules, struct token *token)
 561 {
 562         /* grow buffer if needed */
 563         if (rules->token_cur+1 >= rules->token_max) {
 564                 struct token *tokens;
 565                 unsigned int add;
 566
 567                 /* double the buffer size */
 568                 add = rules->token_max;
 569                 if (add < 8)
 570                         add = 8;
 571
 572                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 573                 if (tokens == NULL)
 574                         return -1;
 575                 rules->tokens = tokens;
 576                 rules->token_max += add;
 577         }
 578         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 579         rules->token_cur++;
 580         return 0;
 581 }
 582
 583 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 584 {
 585         unsigned int i;
 586         uid_t uid;
 587         unsigned int off;
 588
 589         /* lookup, if we know it already */
 590         for (i = 0; i < rules->uids_cur; i++) {
 591                 off = rules->uids[i].name_off;
 592                 if (strcmp(&rules->buf[off], owner) == 0) {
 593                         uid = rules->uids[i].uid;
 594                         return uid;
 595                 }
 596         }
 597         uid = util_lookup_user(rules->udev, owner);
 598
 599         /* grow buffer if needed */
 600         if (rules->uids_cur+1 >= rules->uids_max) {
 601                 struct uid_gid *uids;
 602                 unsigned int add;
 603
 604                 /* double the buffer size */
 605                 add = rules->uids_max;
 606                 if (add < 1)
 607                         add = 8;
 608
 609                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 610                 if (uids == NULL)
 611                         return uid;
 612                 rules->uids = uids;
 613                 rules->uids_max += add;
 614         }
 615         rules->uids[rules->uids_cur].uid = uid;
 616         off = add_string(rules, owner);
 617         if (off <= 0)
 618                 return uid;
 619         rules->uids[rules->uids_cur].name_off = off;
 620         rules->uids_cur++;
 621         return uid;
 622 }
 623
 624 static gid_t add_gid(struct udev_rules *rules, const char *group)
 625 {
 626         unsigned int i;
 627         gid_t gid;
 628         unsigned int off;
 629
 630         /* lookup, if we know it already */
 631         for (i = 0; i < rules->gids_cur; i++) {
 632                 off = rules->gids[i].name_off;
 633                 if (strcmp(&rules->buf[off], group) == 0) {
 634                         gid = rules->gids[i].gid;
 635                         return gid;
 636                 }
 637         }
 638         gid = util_lookup_group(rules->udev, group);
 639
 640         /* grow buffer if needed */
 641         if (rules->gids_cur+1 >= rules->gids_max) {
 642                 struct uid_gid *gids;
 643                 unsigned int add;
 644
 645                 /* double the buffer size */
 646                 add = rules->gids_max;
 647                 if (add < 1)
 648                         add = 8;
 649
 650                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 651                 if (gids == NULL)
 652                         return gid;
 653                 rules->gids = gids;
 654                 rules->gids_max += add;
 655         }
 656         rules->gids[rules->gids_cur].gid = gid;
 657         off = add_string(rules, group);
 658         if (off <= 0)
 659                 return gid;
 660         rules->gids[rules->gids_cur].name_off = off;
 661         rules->gids_cur++;
 662         return gid;
 663 }
 664
 665 static int import_property_from_string(struct udev_device *dev, char *line)
 666 {
 667         struct udev *udev = udev_device_get_udev(dev);
 668         char *key;
 669         char *val;
 670         size_t len;
 671
 672         /* find key */
 673         key = line;
 674         while (isspace(key[0]))
 675                 key++;
 676
 677         /* comment or empty line */
 678         if (key[0] == '#' || key[0] == '\0')
 679                 return -1;
 680
 681         /* split key/value */
 682         val = strchr(key, '=');
 683         if (val == NULL)
 684                 return -1;
 685         val[0] = '\0';
 686         val++;
 687
 688         /* find value */
 689         while (isspace(val[0]))
 690                 val++;
 691
 692         /* terminate key */
 693         len = strlen(key);
 694         if (len == 0)
 695                 return -1;
 696         while (isspace(key[len-1]))
 697                 len--;
 698         key[len] = '\0';
 699
 700         /* terminate value */
 701         len = strlen(val);
 702         if (len == 0)
 703                 return -1;
 704         while (isspace(val[len-1]))
 705                 len--;
 706         val[len] = '\0';
 707
 708         if (len == 0)
 709                 return -1;
 710
 711         /* unquote */
 712         if (val[0] == '"' || val[0] == '\'') {
 713                 if (val[len-1] != val[0]) {
 714                         log_debug("inconsistent quoting: '%s', skip\n", line);
 715                         return -1;
 716                 }
 717                 val[len-1] = '\0';
 718                 val++;
 719         }
 720
 721         /* handle device, renamed by external tool, returning new path */
 722         if (strcmp(key, "DEVPATH") == 0) {
 723                 char syspath[UTIL_PATH_SIZE];
 724
 725                 log_debug("updating devpath from '%s' to '%s'\n",
 726                           udev_device_get_devpath(dev), val);
 727                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 728                 udev_device_set_syspath(dev, syspath);
 729         } else {
 730                 struct udev_list_entry *entry;
 731
 732                 entry = udev_device_add_property(dev, key, val);
 733                 /* store in db, skip private keys */
 734                 if (key[0] != '.')
 735                         udev_list_entry_set_num(entry, true);
 736         }
 737         return 0;
 738 }
 739
 740 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 741 {
 742         FILE *f;
 743         char line[UTIL_LINE_SIZE];
 744
 745         f = fopen(filename, "r");
 746         if (f == NULL)
 747                 return -1;
 748         while (fgets(line, sizeof(line), f) != NULL)
 749                 import_property_from_string(dev, line);
 750         fclose(f);
 751         return 0;
 752 }
 753
 754 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 755 {
 756         struct udev_device *dev = event->dev;
 757         char **envp;
 758         char result[UTIL_LINE_SIZE];
 759         char *line;
 760         int err;
 761
 762         envp = udev_device_get_properties_envp(dev);
 763         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 764         if (err < 0)
 765                 return err;
 766
 767         line = result;
 768         while (line != NULL) {
 769                 char *pos;
 770
 771                 pos = strchr(line, '\n');
 772                 if (pos != NULL) {
 773                         pos[0] = '\0';
 774                         pos = &pos[1];
 775                 }
 776                 import_property_from_string(dev, line);
 777                 line = pos;
 778         }
 779         return 0;
 780 }
 781
 782 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 783 {
 784         struct udev *udev = udev_device_get_udev(dev);
 785         struct udev_device *dev_parent;
 786         struct udev_list_entry *list_entry;
 787
 788         dev_parent = udev_device_get_parent(dev);
 789         if (dev_parent == NULL)
 790                 return -1;
 791
 792         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 793                 const char *key = udev_list_entry_get_name(list_entry);
 794                 const char *val = udev_list_entry_get_value(list_entry);
 795
 796                 if (fnmatch(filter, key, 0) == 0) {
 797                         struct udev_list_entry *entry;
 798
 799                         entry = udev_device_add_property(dev, key, val);
 800                         /* store in db, skip private keys */
 801                         if (key[0] != '.')
 802                                 udev_list_entry_set_num(entry, true);
 803                 }
 804         }
 805         return 0;
 806 }
 807
 808 #define WAIT_LOOP_PER_SECOND                50
 809 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 810 {
 811         struct udev *udev = udev_device_get_udev(dev);
 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),
 821                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 822                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 823                 file = filepath;
 824         }
 825
 826         while (--loop) {
 827                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 828
 829                 /* lookup file */
 830                 if (stat(file, &stats) == 0) {
 831                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 832                         return 0;
 833                 }
 834                 /* make sure, the device did not disappear in the meantime */
 835                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 836                         log_debug("device disappeared while waiting for '%s'\n", file);
 837                         return -2;
 838                 }
 839                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 840                 nanosleep(&duration, NULL);
 841         }
 842         log_debug("waiting for '%s' failed\n", file);
 843         return -1;
 844 }
 845
 846 static int attr_subst_subdir(char *attr, size_t len)
 847 {
 848         bool found = false;
 849
 850         if (strstr(attr, "/*/")) {
 851                 char *pos;
 852                 char dirname[UTIL_PATH_SIZE];
 853                 const char *tail;
 854                 DIR *dir;
 855
 856                 util_strscpy(dirname, sizeof(dirname), attr);
 857                 pos = strstr(dirname, "/*/");
 858                 if (pos == NULL)
 859                         return -1;
 860                 pos[0] = '\0';
 861                 tail = &pos[2];
 862                 dir = opendir(dirname);
 863                 if (dir != NULL) {
 864                         struct dirent *dent;
 865
 866                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 867                                 struct stat stats;
 868
 869                                 if (dent->d_name[0] == '.')
 870                                         continue;
 871                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 872                                 if (stat(attr, &stats) == 0) {
 873                                         found = true;
 874                                         break;
 875                                 }
 876                         }
 877                         closedir(dir);
 878                 }
 879         }
 880
 881         return found;
 882 }
 883
 884 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 885 {
 886         char *linepos;
 887         char *temp;
 888
 889         linepos = *line;
 890         if (linepos == NULL || linepos[0] == '\0')
 891                 return -1;
 892
 893         /* skip whitespace */
 894         while (isspace(linepos[0]) || linepos[0] == ',')
 895                 linepos++;
 896
 897         /* get the key */
 898         if (linepos[0] == '\0')
 899                 return -1;
 900         *key = linepos;
 901
 902         for (;;) {
 903                 linepos++;
 904                 if (linepos[0] == '\0')
 905                         return -1;
 906                 if (isspace(linepos[0]))
 907                         break;
 908                 if (linepos[0] == '=')
 909                         break;
 910                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 911                         if (linepos[1] == '=')
 912                                 break;
 913         }
 914
 915         /* remember end of key */
 916         temp = linepos;
 917
 918         /* skip whitespace after key */
 919         while (isspace(linepos[0]))
 920                 linepos++;
 921         if (linepos[0] == '\0')
 922                 return -1;
 923
 924         /* get operation type */
 925         if (linepos[0] == '=' && linepos[1] == '=') {
 926                 *op = OP_MATCH;
 927                 linepos += 2;
 928         } else if (linepos[0] == '!' && linepos[1] == '=') {
 929                 *op = OP_NOMATCH;
 930                 linepos += 2;
 931         } else if (linepos[0] == '+' && linepos[1] == '=') {
 932                 *op = OP_ADD;
 933                 linepos += 2;
 934         } else if (linepos[0] == '=') {
 935                 *op = OP_ASSIGN;
 936                 linepos++;
 937         } else if (linepos[0] == ':' && linepos[1] == '=') {
 938                 *op = OP_ASSIGN_FINAL;
 939                 linepos += 2;
 940         } else
 941                 return -1;
 942
 943         /* terminate key */
 944         temp[0] = '\0';
 945
 946         /* skip whitespace after operator */
 947         while (isspace(linepos[0]))
 948                 linepos++;
 949         if (linepos[0] == '\0')
 950                 return -1;
 951
 952         /* get the value */
 953         if (linepos[0] == '"')
 954                 linepos++;
 955         else
 956                 return -1;
 957         *value = linepos;
 958
 959         /* terminate */
 960         temp = strchr(linepos, '"');
 961         if (!temp)
 962                 return -1;
 963         temp[0] = '\0';
 964         temp++;
 965
 966         /* move line to next key */
 967         *line = temp;
 968         return 0;
 969 }
 970
 971 /* extract possible KEY{attr} */
 972 static char *get_key_attribute(struct udev *udev, char *str)
 973 {
 974         char *pos;
 975         char *attr;
 976
 977         attr = strchr(str, '{');
 978         if (attr != NULL) {
 979                 attr++;
 980                 pos = strchr(attr, '}');
 981                 if (pos == NULL) {
 982                         log_error("missing closing brace for format\n");
 983                         return NULL;
 984                 }
 985                 pos[0] = '\0';
 986                 return attr;
 987         }
 988         return NULL;
 989 }
 990
 991 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 992                         enum operation_type op,
 993                         const char *value, const void *data)
 994 {
 995         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 996         const char *attr = NULL;
 997
 998         memset(token, 0x00, sizeof(struct token));
 999
1000         switch (type) {
1001         case TK_M_ACTION:
1002         case TK_M_DEVPATH:
1003         case TK_M_KERNEL:
1004         case TK_M_SUBSYSTEM:
1005         case TK_M_DRIVER:
1006         case TK_M_WAITFOR:
1007         case TK_M_DEVLINK:
1008         case TK_M_NAME:
1009         case TK_M_KERNELS:
1010         case TK_M_SUBSYSTEMS:
1011         case TK_M_DRIVERS:
1012         case TK_M_TAGS:
1013         case TK_M_PROGRAM:
1014         case TK_M_IMPORT_FILE:
1015         case TK_M_IMPORT_PROG:
1016         case TK_M_IMPORT_DB:
1017         case TK_M_IMPORT_CMDLINE:
1018         case TK_M_IMPORT_PARENT:
1019         case TK_M_RESULT:
1020         case TK_A_OWNER:
1021         case TK_A_GROUP:
1022         case TK_A_MODE:
1023         case TK_A_NAME:
1024         case TK_A_GOTO:
1025         case TK_M_TAG:
1026         case TK_A_TAG:
1027                 token->key.value_off = add_string(rule_tmp->rules, value);
1028                 break;
1029         case TK_M_IMPORT_BUILTIN:
1030                 token->key.value_off = add_string(rule_tmp->rules, value);
1031                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1032                 break;
1033         case TK_M_ENV:
1034         case TK_M_ATTR:
1035         case TK_M_ATTRS:
1036         case TK_A_ATTR:
1037         case TK_A_ENV:
1038                 attr = data;
1039                 token->key.value_off = add_string(rule_tmp->rules, value);
1040                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1041                 break;
1042         case TK_A_DEVLINK:
1043                 token->key.value_off = add_string(rule_tmp->rules, value);
1044                 token->key.devlink_unique = *(int *)data;
1045                 break;
1046         case TK_M_TEST:
1047                 token->key.value_off = add_string(rule_tmp->rules, value);
1048                 if (data != NULL)
1049                         token->key.mode = *(mode_t *)data;
1050                 break;
1051         case TK_A_STRING_ESCAPE_NONE:
1052         case TK_A_STRING_ESCAPE_REPLACE:
1053         case TK_A_DB_PERSIST:
1054                 break;
1055         case TK_A_RUN_BUILTIN:
1056                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1057         case TK_A_RUN_PROGRAM:
1058                 token->key.value_off = add_string(rule_tmp->rules, value);
1059                 break;
1060         case TK_A_INOTIFY_WATCH:
1061         case TK_A_DEVLINK_PRIO:
1062                 token->key.devlink_prio = *(int *)data;
1063                 break;
1064         case TK_A_OWNER_ID:
1065                 token->key.uid = *(uid_t *)data;
1066                 break;
1067         case TK_A_GROUP_ID:
1068                 token->key.gid = *(gid_t *)data;
1069                 break;
1070         case TK_A_MODE_ID:
1071                 token->key.mode = *(mode_t *)data;
1072                 break;
1073         case TK_A_STATIC_NODE:
1074                 token->key.value_off = add_string(rule_tmp->rules, value);
1075                 break;
1076         case TK_M_EVENT_TIMEOUT:
1077                 token->key.event_timeout = *(int *)data;
1078                 break;
1079         case TK_RULE:
1080         case TK_M_PARENTS_MIN:
1081         case TK_M_PARENTS_MAX:
1082         case TK_M_MAX:
1083         case TK_END:
1084         case TK_UNSET:
1085                 log_error("wrong type %u\n", type);
1086                 return -1;
1087         }
1088
1089         if (value != NULL && type < TK_M_MAX) {
1090                 /* check if we need to split or call fnmatch() while matching rules */
1091                 enum string_glob_type glob;
1092                 int has_split;
1093                 int has_glob;
1094
1095                 has_split = (strchr(value, '|') != NULL);
1096                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1097                 if (has_split && has_glob) {
1098                         glob = GL_SPLIT_GLOB;
1099                 } else if (has_split) {
1100                         glob = GL_SPLIT;
1101                 } else if (has_glob) {
1102                         if (strcmp(value, "?*") == 0)
1103                                 glob = GL_SOMETHING;
1104                         else
1105                                 glob = GL_GLOB;
1106                 } else {
1107                         glob = GL_PLAIN;
1108                 }
1109                 token->key.glob = glob;
1110         }
1111
1112         if (value != NULL && type > TK_M_MAX) {
1113                 /* check if assigned value has substitution chars */
1114                 if (value[0] == '[')
1115                         token->key.subst = SB_SUBSYS;
1116                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1117                         token->key.subst = SB_FORMAT;
1118                 else
1119                         token->key.subst = SB_NONE;
1120         }
1121
1122         if (attr != NULL) {
1123                 /* check if property/attribut name has substitution chars */
1124                 if (attr[0] == '[')
1125                         token->key.attrsubst = SB_SUBSYS;
1126                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1127                         token->key.attrsubst = SB_FORMAT;
1128                 else
1129                         token->key.attrsubst = SB_NONE;
1130         }
1131
1132         token->key.type = type;
1133         token->key.op = op;
1134         rule_tmp->token_cur++;
1135         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1136                 log_error("temporary rule array too small\n");
1137                 return -1;
1138         }
1139         return 0;
1140 }
1141
1142 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1143 {
1144         unsigned int i;
1145         unsigned int start = 0;
1146         unsigned int end = rule_tmp->token_cur;
1147
1148         for (i = 0; i < rule_tmp->token_cur; i++) {
1149                 enum token_type next_val = TK_UNSET;
1150                 unsigned int next_idx = 0;
1151                 unsigned int j;
1152
1153                 /* find smallest value */
1154                 for (j = start; j < end; j++) {
1155                         if (rule_tmp->token[j].type == TK_UNSET)
1156                                 continue;
1157                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1158                                 next_val = rule_tmp->token[j].type;
1159                                 next_idx = j;
1160                         }
1161                 }
1162
1163                 /* add token and mark done */
1164                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1165                         return -1;
1166                 rule_tmp->token[next_idx].type = TK_UNSET;
1167
1168                 /* shrink range */
1169                 if (next_idx == start)
1170                         start++;
1171                 if (next_idx+1 == end)
1172                         end--;
1173         }
1174         return 0;
1175 }
1176
1177 static int add_rule(struct udev_rules *rules, char *line,
1178                     const char *filename, unsigned int filename_off, unsigned int lineno)
1179 {
1180         char *linepos;
1181         char *attr;
1182         struct rule_tmp rule_tmp;
1183
1184         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1185         rule_tmp.rules = rules;
1186         rule_tmp.rule.type = TK_RULE;
1187         rule_tmp.rule.rule.filename_off = filename_off;
1188         rule_tmp.rule.rule.filename_line = lineno;
1189
1190         linepos = line;
1191         for (;;) {
1192                 char *key;
1193                 char *value;
1194                 enum operation_type op;
1195
1196                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1197                         break;
1198
1199                 if (strcmp(key, "ACTION") == 0) {
1200                         if (op > OP_MATCH_MAX) {
1201                                 log_error("invalid ACTION operation\n");
1202                                 goto invalid;
1203                         }
1204                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1205                         continue;
1206                 }
1207
1208                 if (strcmp(key, "DEVPATH") == 0) {
1209                         if (op > OP_MATCH_MAX) {
1210                                 log_error("invalid DEVPATH operation\n");
1211                                 goto invalid;
1212                         }
1213                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1214                         continue;
1215                 }
1216
1217                 if (strcmp(key, "KERNEL") == 0) {
1218                         if (op > OP_MATCH_MAX) {
1219                                 log_error("invalid KERNEL operation\n");
1220                                 goto invalid;
1221                         }
1222                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1223                         continue;
1224                 }
1225
1226                 if (strcmp(key, "SUBSYSTEM") == 0) {
1227                         if (op > OP_MATCH_MAX) {
1228                                 log_error("invalid SUBSYSTEM operation\n");
1229                                 goto invalid;
1230                         }
1231                         /* bus, class, subsystem events should all be the same */
1232                         if (strcmp(value, "subsystem") == 0 ||
1233                             strcmp(value, "bus") == 0 ||
1234                             strcmp(value, "class") == 0) {
1235                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1236                                         log_error("'%s' must be specified as 'subsystem' \n"
1237                                             "please fix it in %s:%u", value, filename, lineno);
1238                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1239                         } else
1240                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1241                         continue;
1242                 }
1243
1244                 if (strcmp(key, "DRIVER") == 0) {
1245                         if (op > OP_MATCH_MAX) {
1246                                 log_error("invalid DRIVER operation\n");
1247                                 goto invalid;
1248                         }
1249                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1250                         continue;
1251                 }
1252
1253                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1254                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1255                         if (attr == NULL) {
1256                                 log_error("error parsing ATTR attribute\n");
1257                                 goto invalid;
1258                         }
1259                         if (op < OP_MATCH_MAX) {
1260                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1261                         } else {
1262                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1263                         }
1264                         continue;
1265                 }
1266
1267                 if (strcmp(key, "KERNELS") == 0) {
1268                         if (op > OP_MATCH_MAX) {
1269                                 log_error("invalid KERNELS operation\n");
1270                                 goto invalid;
1271                         }
1272                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1273                         continue;
1274                 }
1275
1276                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1277                         if (op > OP_MATCH_MAX) {
1278                                 log_error("invalid SUBSYSTEMS operation\n");
1279                                 goto invalid;
1280                         }
1281                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1282                         continue;
1283                 }
1284
1285                 if (strcmp(key, "DRIVERS") == 0) {
1286                         if (op > OP_MATCH_MAX) {
1287                                 log_error("invalid DRIVERS operation\n");
1288                                 goto invalid;
1289                         }
1290                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1291                         continue;
1292                 }
1293
1294                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1295                         if (op > OP_MATCH_MAX) {
1296                                 log_error("invalid ATTRS operation\n");
1297                                 goto invalid;
1298                         }
1299                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1300                         if (attr == NULL) {
1301                                 log_error("error parsing ATTRS attribute\n");
1302                                 goto invalid;
1303                         }
1304                         if (strncmp(attr, "device/", 7) == 0)
1305                                 log_error("the 'device' link may not be available in a future kernel, "
1306                                     "please fix it in %s:%u", filename, lineno);
1307                         else if (strstr(attr, "../") != NULL)
1308                                 log_error("do not reference parent sysfs directories directly, "
1309                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1310                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1311                         continue;
1312                 }
1313
1314                 if (strcmp(key, "TAGS") == 0) {
1315                         if (op > OP_MATCH_MAX) {
1316                                 log_error("invalid TAGS operation\n");
1317                                 goto invalid;
1318                         }
1319                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1320                         continue;
1321                 }
1322
1323                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1324                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1325                         if (attr == NULL) {
1326                                 log_error("error parsing ENV attribute\n");
1327                                 goto invalid;
1328                         }
1329                         if (op < OP_MATCH_MAX) {
1330                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1331                                         goto invalid;
1332                         } else {
1333                                 static const char *blacklist[] = {
1334                                         "ACTION",
1335                                         "SUBSYSTEM",
1336                                         "DEVTYPE",
1337                                         "MAJOR",
1338                                         "MINOR",
1339                                         "DRIVER",
1340                                         "IFINDEX",
1341                                         "DEVNAME",
1342                                         "DEVLINKS",
1343                                         "DEVPATH",
1344                                         "TAGS",
1345                                 };
1346                                 unsigned int i;
1347
1348                                 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1349                                         if (strcmp(attr, blacklist[i]) == 0) {
1350                                                 log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1351                                                 continue;
1352                                         }
1353                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1354                                         goto invalid;
1355                         }
1356                         continue;
1357                 }
1358
1359                 if (strcmp(key, "TAG") == 0) {
1360                         if (op < OP_MATCH_MAX)
1361                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1362                         else
1363                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1364                         continue;
1365                 }
1366
1367                 if (strcmp(key, "PROGRAM") == 0) {
1368                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1369                         continue;
1370                 }
1371
1372                 if (strcmp(key, "RESULT") == 0) {
1373                         if (op > OP_MATCH_MAX) {
1374                                 log_error("invalid RESULT operation\n");
1375                                 goto invalid;
1376                         }
1377                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1378                         continue;
1379                 }
1380
1381                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1382                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1383                         if (attr == NULL) {
1384                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1385                                 continue;
1386                         }
1387                         if (strcmp(attr, "program") == 0) {
1388                                 /* find known built-in command */
1389                                 if (value[0] != '/') {
1390                                         enum udev_builtin_cmd cmd;
1391
1392                                         cmd = udev_builtin_lookup(value);
1393                                         if (cmd < UDEV_BUILTIN_MAX) {
1394                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1395                                                           value, filename, lineno);
1396                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1397                                                 continue;
1398                                         }
1399                                 }
1400                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1401                         } else if (strcmp(attr, "builtin") == 0) {
1402                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1403
1404                                 if (cmd < UDEV_BUILTIN_MAX)
1405                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1406                                 else
1407                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1408                         } else if (strcmp(attr, "file") == 0) {
1409                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1410                         } else if (strcmp(attr, "db") == 0) {
1411                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1412                         } else if (strcmp(attr, "cmdline") == 0) {
1413                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1414                         } else if (strcmp(attr, "parent") == 0) {
1415                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1416                         } else
1417                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1418                         continue;
1419                 }
1420
1421                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1422                         mode_t mode = 0;
1423
1424                         if (op > OP_MATCH_MAX) {
1425                                 log_error("invalid TEST operation\n");
1426                                 goto invalid;
1427                         }
1428                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1429                         if (attr != NULL) {
1430                                 mode = strtol(attr, NULL, 8);
1431                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1432                         } else {
1433                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1434                         }
1435                         continue;
1436                 }
1437
1438                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1439                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1440                         if (attr == NULL)
1441                                 attr = "program";
1442
1443                         if (strcmp(attr, "builtin") == 0) {
1444                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1445
1446                                 if (cmd < UDEV_BUILTIN_MAX)
1447                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1448                                 else
1449                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1450                         } else if (strcmp(attr, "program") == 0) {
1451                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1452
1453                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1454                         } else {
1455                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1456                         }
1457
1458                         continue;
1459                 }
1460
1461                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1462                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1463                         continue;
1464                 }
1465
1466                 if (strcmp(key, "LABEL") == 0) {
1467                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1468                         continue;
1469                 }
1470
1471                 if (strcmp(key, "GOTO") == 0) {
1472                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1473                         continue;
1474                 }
1475
1476                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1477                         if (op < OP_MATCH_MAX) {
1478                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1479                         } else {
1480                                 if (strcmp(value, "%k") == 0) {
1481                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1482                                             "please remove it from %s:%u\n", filename, lineno);
1483                                         continue;
1484                                 }
1485                                 if (value[0] == '\0') {
1486                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1487                                                   "please remove it from %s:%u\n", filename, lineno);
1488                                         continue;
1489                                 }
1490                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1491                         }
1492                         rule_tmp.rule.rule.can_set_name = true;
1493                         continue;
1494                 }
1495
1496                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1497                         if (op < OP_MATCH_MAX) {
1498                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1499                         } else {
1500                                 int flag = 0;
1501
1502                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1503                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1504                                         flag = 1;
1505                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1506                         }
1507                         rule_tmp.rule.rule.can_set_name = true;
1508                         continue;
1509                 }
1510
1511                 if (strcmp(key, "OWNER") == 0) {
1512                         uid_t uid;
1513                         char *endptr;
1514
1515                         uid = strtoul(value, &endptr, 10);
1516                         if (endptr[0] == '\0') {
1517                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1518                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1519                                 uid = add_uid(rules, value);
1520                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1521                         } else if (rules->resolve_names >= 0) {
1522                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1523                         }
1524                         rule_tmp.rule.rule.can_set_name = true;
1525                         continue;
1526                 }
1527
1528                 if (strcmp(key, "GROUP") == 0) {
1529                         gid_t gid;
1530                         char *endptr;
1531
1532                         gid = strtoul(value, &endptr, 10);
1533                         if (endptr[0] == '\0') {
1534                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1535                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1536                                 gid = add_gid(rules, value);
1537                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1538                         } else if (rules->resolve_names >= 0) {
1539                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1540                         }
1541                         rule_tmp.rule.rule.can_set_name = true;
1542                         continue;
1543                 }
1544
1545                 if (strcmp(key, "MODE") == 0) {
1546                         mode_t mode;
1547                         char *endptr;
1548
1549                         mode = strtol(value, &endptr, 8);
1550                         if (endptr[0] == '\0')
1551                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1552                         else
1553                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1554                         rule_tmp.rule.rule.can_set_name = true;
1555                         continue;
1556                 }
1557
1558                 if (strcmp(key, "OPTIONS") == 0) {
1559                         const char *pos;
1560
1561                         pos = strstr(value, "link_priority=");
1562                         if (pos != NULL) {
1563                                 int prio = atoi(&pos[strlen("link_priority=")]);
1564
1565                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1566                         }
1567
1568                         pos = strstr(value, "event_timeout=");
1569                         if (pos != NULL) {
1570                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1571
1572                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1573                         }
1574
1575                         pos = strstr(value, "string_escape=");
1576                         if (pos != NULL) {
1577                                 pos = &pos[strlen("string_escape=")];
1578                                 if (strncmp(pos, "none", strlen("none")) == 0)
1579                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1580                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1581                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1582                         }
1583
1584                         pos = strstr(value, "db_persist");
1585                         if (pos != NULL)
1586                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1587
1588                         pos = strstr(value, "nowatch");
1589                         if (pos != NULL) {
1590                                 const int off = 0;
1591
1592                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1593                         } else {
1594                                 pos = strstr(value, "watch");
1595                                 if (pos != NULL) {
1596                                         const int on = 1;
1597
1598                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1599                                 }
1600                         }
1601
1602                         pos = strstr(value, "static_node=");
1603                         if (pos != NULL) {
1604                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1605                                 rule_tmp.rule.rule.has_static_node = true;
1606                         }
1607
1608                         continue;
1609                 }
1610
1611                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1612                 goto invalid;
1613         }
1614
1615         /* add rule token */
1616         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1617         if (add_token(rules, &rule_tmp.rule) != 0)
1618                 goto invalid;
1619
1620         /* add tokens to list, sorted by type */
1621         if (sort_token(rules, &rule_tmp) != 0)
1622                 goto invalid;
1623
1624         return 0;
1625 invalid:
1626         log_error("invalid rule '%s:%u'\n", filename, lineno);
1627         return -1;
1628 }
1629
1630 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1631 {
1632         FILE *f;
1633         unsigned int first_token;
1634         char line[UTIL_LINE_SIZE];
1635         int line_nr = 0;
1636         unsigned int i;
1637
1638         log_debug("reading '%s' as rules file\n", filename);
1639
1640         f = fopen(filename, "r");
1641         if (f == NULL)
1642                 return -1;
1643
1644         first_token = rules->token_cur;
1645
1646         while (fgets(line, sizeof(line), f) != NULL) {
1647                 char *key;
1648                 size_t len;
1649
1650                 /* skip whitespace */
1651                 line_nr++;
1652                 key = line;
1653                 while (isspace(key[0]))
1654                         key++;
1655
1656                 /* comment */
1657                 if (key[0] == '#')
1658                         continue;
1659
1660                 len = strlen(line);
1661                 if (len < 3)
1662                         continue;
1663
1664                 /* continue reading if backslash+newline is found */
1665                 while (line[len-2] == '\\') {
1666                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1667                                 break;
1668                         if (strlen(&line[len-2]) < 2)
1669                                 break;
1670                         line_nr++;
1671                         len = strlen(line);
1672                 }
1673
1674                 if (len+1 >= sizeof(line)) {
1675                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1676                         continue;
1677                 }
1678                 add_rule(rules, key, filename, filename_off, line_nr);
1679         }
1680         fclose(f);
1681
1682         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1683         for (i = first_token+1; i < rules->token_cur; i++) {
1684                 if (rules->tokens[i].type == TK_A_GOTO) {
1685                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1686                         unsigned int j;
1687
1688                         for (j = i+1; j < rules->token_cur; j++) {
1689                                 if (rules->tokens[j].type != TK_RULE)
1690                                         continue;
1691                                 if (rules->tokens[j].rule.label_off == 0)
1692                                         continue;
1693                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1694                                         continue;
1695                                 rules->tokens[i].key.rule_goto = j;
1696                                 break;
1697                         }
1698                         if (rules->tokens[i].key.rule_goto == 0)
1699                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1700                 }
1701         }
1702         return 0;
1703 }
1704
1705 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1706 {
1707         DIR *dir;
1708         struct dirent *dent;
1709         char filename[UTIL_PATH_SIZE];
1710
1711         dir = opendir(dirname);
1712         if (dir == NULL) {
1713                 log_debug("unable to open '%s': %m\n", dirname);
1714                 return -1;
1715         }
1716
1717         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1718                 if (dent->d_name[0] == '.')
1719                         continue;
1720
1721                 /* look for file matching with specified suffix */
1722                 if (suffix != NULL) {
1723                         const char *ext;
1724
1725                         ext = strrchr(dent->d_name, '.');
1726                         if (ext == NULL)
1727                                 continue;
1728                         if (strcmp(ext, suffix) != 0)
1729                                 continue;
1730                 }
1731                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1732                 /*
1733                  * the basename is the key, the filename the value
1734                  * identical basenames from different directories override each other
1735                  * entries are sorted after basename
1736                  */
1737                 udev_list_entry_add(file_list, dent->d_name, filename);
1738         }
1739
1740         closedir(dir);
1741         return 0;
1742 }
1743
1744 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1745 {
1746         struct udev_rules *rules;
1747         struct udev_list file_list;
1748         struct udev_list_entry *file_loop;
1749         struct token end_token;
1750         char **s;
1751
1752         rules = calloc(1, sizeof(struct udev_rules));
1753         if (rules == NULL)
1754                 return NULL;
1755         rules->udev = udev;
1756         rules->resolve_names = resolve_names;
1757         udev_list_init(udev, &file_list, true);
1758
1759         /* init token array and string buffer */
1760         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1761         if (rules->tokens == NULL) {
1762                 free(rules);
1763                 return NULL;
1764         }
1765         rules->token_max = PREALLOC_TOKEN;
1766
1767         rules->buf = malloc(PREALLOC_STRBUF);
1768         if (rules->buf == NULL) {
1769                 free(rules->tokens);
1770                 free(rules);
1771                 return NULL;
1772         }
1773         rules->buf_max = PREALLOC_STRBUF;
1774         /* offset 0 is always '\0' */
1775         rules->buf[0] = '\0';
1776         rules->buf_cur = 1;
1777
1778         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1779         if (rules->trie_nodes == NULL) {
1780                 free(rules->buf);
1781                 free(rules->tokens);
1782                 free(rules);
1783                 return NULL;
1784         }
1785         rules->trie_nodes_max = PREALLOC_TRIE;
1786         /* offset 0 is the trie root, with an empty string */
1787         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1788         rules->trie_nodes_cur = 1;
1789
1790         for (udev_get_rules_path(udev, &s, NULL); *s != NULL; s++)
1791                 add_matching_files(udev, &file_list, *s, ".rules");
1792
1793         /* add all filenames to the string buffer */
1794         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1795                 const char *filename = udev_list_entry_get_value(file_loop);
1796                 unsigned int filename_off;
1797
1798                 filename_off = add_string(rules, filename);
1799                 /* the offset in the rule is limited to unsigned short */
1800                 if (filename_off < USHRT_MAX)
1801                         udev_list_entry_set_num(file_loop, filename_off);
1802         }
1803
1804         /* parse all rules files */
1805         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1806                 const char *filename = udev_list_entry_get_value(file_loop);
1807                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1808                 struct stat st;
1809
1810                 if (stat(filename, &st) != 0) {
1811                         log_error("can not find '%s': %m\n", filename);
1812                         continue;
1813                 }
1814                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1815                         log_debug("ignore empty '%s'\n", filename);
1816                         continue;
1817                 }
1818                 if (S_ISCHR(st.st_mode)) {
1819                         log_debug("ignore masked '%s'\n", filename);
1820                         continue;
1821                 }
1822                 parse_file(rules, filename, filename_off);
1823         }
1824         udev_list_cleanup(&file_list);
1825
1826         memset(&end_token, 0x00, sizeof(struct token));
1827         end_token.type = TK_END;
1828         add_token(rules, &end_token);
1829
1830         /* shrink allocated token and string buffer */
1831         if (rules->token_cur < rules->token_max) {
1832                 struct token *tokens;
1833
1834                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1835                 if (tokens != NULL || rules->token_cur == 0) {
1836                         rules->tokens = tokens;
1837                         rules->token_max = rules->token_cur;
1838                 }
1839         }
1840         if (rules->buf_cur < rules->buf_max) {
1841                 char *buf;
1842
1843                 buf = realloc(rules->buf, rules->buf_cur);
1844                 if (buf != NULL || rules->buf_cur == 0) {
1845                         rules->buf = buf;
1846                         rules->buf_max = rules->buf_cur;
1847                 }
1848         }
1849         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1850                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1851         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1852                   rules->trie_nodes_cur * sizeof(struct trie_node),
1853                   rules->trie_nodes_cur, sizeof(struct trie_node));
1854
1855         /* cleanup trie */
1856         free(rules->trie_nodes);
1857         rules->trie_nodes = NULL;
1858         rules->trie_nodes_cur = 0;
1859         rules->trie_nodes_max = 0;
1860
1861         /* cleanup uid/gid cache */
1862         free(rules->uids);
1863         rules->uids = NULL;
1864         rules->uids_cur = 0;
1865         rules->uids_max = 0;
1866         free(rules->gids);
1867         rules->gids = NULL;
1868         rules->gids_cur = 0;
1869         rules->gids_max = 0;
1870
1871         dump_rules(rules);
1872         return rules;
1873 }
1874
1875 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1876 {
1877         if (rules == NULL)
1878                 return NULL;
1879         free(rules->tokens);
1880         free(rules->buf);
1881         free(rules->trie_nodes);
1882         free(rules->uids);
1883         free(rules->gids);
1884         free(rules);
1885         return NULL;
1886 }
1887
1888 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1889 {
1890         char *key_value = &rules->buf[token->key.value_off];
1891         char *pos;
1892         bool match = false;
1893
1894         if (val == NULL)
1895                 val = "";
1896
1897         switch (token->key.glob) {
1898         case GL_PLAIN:
1899                 match = (strcmp(key_value, val) == 0);
1900                 break;
1901         case GL_GLOB:
1902                 match = (fnmatch(key_value, val, 0) == 0);
1903                 break;
1904         case GL_SPLIT:
1905                 {
1906                         const char *split;
1907                         size_t len;
1908
1909                         split = &rules->buf[token->key.value_off];
1910                         len = strlen(val);
1911                         for (;;) {
1912                                 const char *next;
1913
1914                                 next = strchr(split, '|');
1915                                 if (next != NULL) {
1916                                         size_t matchlen = (size_t)(next - split);
1917
1918                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1919                                         if (match)
1920                                                 break;
1921                                 } else {
1922                                         match = (strcmp(split, val) == 0);
1923                                         break;
1924                                 }
1925                                 split = &next[1];
1926                         }
1927                         break;
1928                 }
1929         case GL_SPLIT_GLOB:
1930                 {
1931                         char value[UTIL_PATH_SIZE];
1932
1933                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1934                         key_value = value;
1935                         while (key_value != NULL) {
1936                                 pos = strchr(key_value, '|');
1937                                 if (pos != NULL) {
1938                                         pos[0] = '\0';
1939                                         pos = &pos[1];
1940                                 }
1941                                 match = (fnmatch(key_value, val, 0) == 0);
1942                                 if (match)
1943                                         break;
1944                                 key_value = pos;
1945                         }
1946                         break;
1947                 }
1948         case GL_SOMETHING:
1949                 match = (val[0] != '\0');
1950                 break;
1951         case GL_UNSET:
1952                 return -1;
1953         }
1954
1955         if (match && (token->key.op == OP_MATCH))
1956                 return 0;
1957         if (!match && (token->key.op == OP_NOMATCH))
1958                 return 0;
1959         return -1;
1960 }
1961
1962 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1963 {
1964         const char *name;
1965         char nbuf[UTIL_NAME_SIZE];
1966         const char *value;
1967         char vbuf[UTIL_NAME_SIZE];
1968         size_t len;
1969
1970         name = &rules->buf[cur->key.attr_off];
1971         switch (cur->key.attrsubst) {
1972         case SB_FORMAT:
1973                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1974                 name = nbuf;
1975                 /* fall through */
1976         case SB_NONE:
1977                 value = udev_device_get_sysattr_value(dev, name);
1978                 if (value == NULL)
1979                         return -1;
1980                 break;
1981         case SB_SUBSYS:
1982                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1983                         return -1;
1984                 value = vbuf;
1985                 break;
1986         default:
1987                 return -1;
1988         }
1989
1990         /* remove trailing whitespace, if not asked to match for it */
1991         len = strlen(value);
1992         if (len > 0 && isspace(value[len-1])) {
1993                 const char *key_value;
1994                 size_t klen;
1995
1996                 key_value = &rules->buf[cur->key.value_off];
1997                 klen = strlen(key_value);
1998                 if (klen > 0 && !isspace(key_value[klen-1])) {
1999                         if (value != vbuf) {
2000                                 util_strscpy(vbuf, sizeof(vbuf), value);
2001                                 value = vbuf;
2002                         }
2003                         while (len > 0 && isspace(vbuf[--len]))
2004                                 vbuf[len] = '\0';
2005                 }
2006         }
2007
2008         return match_key(rules, cur, value);
2009 }
2010
2011 enum escape_type {
2012         ESCAPE_UNSET,
2013         ESCAPE_NONE,
2014         ESCAPE_REPLACE,
2015 };
2016
2017 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2018 {
2019         struct token *cur;
2020         struct token *rule;
2021         enum escape_type esc = ESCAPE_UNSET;
2022         bool can_set_name;
2023
2024         if (rules->tokens == NULL)
2025                 return -1;
2026
2027         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2028                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2029                          udev_device_get_ifindex(event->dev) > 0));
2030
2031         /* loop through token list, match, run actions or forward to next rule */
2032         cur = &rules->tokens[0];
2033         rule = cur;
2034         for (;;) {
2035                 dump_token(rules, cur);
2036                 switch (cur->type) {
2037                 case TK_RULE:
2038                         /* current rule */
2039                         rule = cur;
2040                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2041                         if (!can_set_name && rule->rule.can_set_name)
2042                                 goto nomatch;
2043                         esc = ESCAPE_UNSET;
2044                         break;
2045                 case TK_M_ACTION:
2046                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2047                                 goto nomatch;
2048                         break;
2049                 case TK_M_DEVPATH:
2050                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2051                                 goto nomatch;
2052                         break;
2053                 case TK_M_KERNEL:
2054                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2055                                 goto nomatch;
2056                         break;
2057                 case TK_M_DEVLINK: {
2058                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2059                         struct udev_list_entry *list_entry;
2060                         bool match = false;
2061
2062                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2063                                 const char *devlink;
2064
2065                                 devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2066                                 if (match_key(rules, cur, devlink) == 0) {
2067                                         match = true;
2068                                         break;
2069                                 }
2070                         }
2071                         if (!match)
2072                                 goto nomatch;
2073                         break;
2074                 }
2075                 case TK_M_NAME:
2076                         if (match_key(rules, cur, event->name) != 0)
2077                                 goto nomatch;
2078                         break;
2079                 case TK_M_ENV: {
2080                         const char *key_name = &rules->buf[cur->key.attr_off];
2081                         const char *value;
2082
2083                         value = udev_device_get_property_value(event->dev, key_name);
2084                         if (value == NULL)
2085                                 value = "";
2086                         if (match_key(rules, cur, value))
2087                                 goto nomatch;
2088                         break;
2089                 }
2090                 case TK_M_TAG: {
2091                         struct udev_list_entry *list_entry;
2092                         bool match = false;
2093
2094                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2095                                 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2096                                         match = true;
2097                                         break;
2098                                 }
2099                         }
2100                         if (!match && (cur->key.op != OP_NOMATCH))
2101                                 goto nomatch;
2102                         break;
2103                 }
2104                 case TK_M_SUBSYSTEM:
2105                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2106                                 goto nomatch;
2107                         break;
2108                 case TK_M_DRIVER:
2109                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2110                                 goto nomatch;
2111                         break;
2112                 case TK_M_WAITFOR: {
2113                         char filename[UTIL_PATH_SIZE];
2114                         int found;
2115
2116                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2117                         found = (wait_for_file(event->dev, filename, 10) == 0);
2118                         if (!found && (cur->key.op != OP_NOMATCH))
2119                                 goto nomatch;
2120                         break;
2121                 }
2122                 case TK_M_ATTR:
2123                         if (match_attr(rules, event->dev, event, cur) != 0)
2124                                 goto nomatch;
2125                         break;
2126                 case TK_M_KERNELS:
2127                 case TK_M_SUBSYSTEMS:
2128                 case TK_M_DRIVERS:
2129                 case TK_M_ATTRS:
2130                 case TK_M_TAGS: {
2131                         struct token *next;
2132
2133                         /* get whole sequence of parent matches */
2134                         next = cur;
2135                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2136                                 next++;
2137
2138                         /* loop over parents */
2139                         event->dev_parent = event->dev;
2140                         for (;;) {
2141                                 struct token *key;
2142
2143                                 /* loop over sequence of parent match keys */
2144                                 for (key = cur; key < next; key++ ) {
2145                                         dump_token(rules, key);
2146                                         switch(key->type) {
2147                                         case TK_M_KERNELS:
2148                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2149                                                         goto try_parent;
2150                                                 break;
2151                                         case TK_M_SUBSYSTEMS:
2152                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2153                                                         goto try_parent;
2154                                                 break;
2155                                         case TK_M_DRIVERS:
2156                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2157                                                         goto try_parent;
2158                                                 break;
2159                                         case TK_M_ATTRS:
2160                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2161                                                         goto try_parent;
2162                                                 break;
2163                                         case TK_M_TAGS: {
2164                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2165
2166                                                 if (match && key->key.op == OP_NOMATCH)
2167                                                         goto try_parent;
2168                                                 if (!match && key->key.op == OP_MATCH)
2169                                                         goto try_parent;
2170                                                 break;
2171                                         }
2172                                         default:
2173                                                 goto nomatch;
2174                                         }
2175                                 }
2176                                 break;
2177
2178                         try_parent:
2179                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2180                                 if (event->dev_parent == NULL)
2181                                         goto nomatch;
2182                         }
2183                         /* move behind our sequence of parent match keys */
2184                         cur = next;
2185                         continue;
2186                 }
2187                 case TK_M_TEST: {
2188                         char filename[UTIL_PATH_SIZE];
2189                         struct stat statbuf;
2190                         int match;
2191
2192                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2193                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2194                                 if (filename[0] != '/') {
2195                                         char tmp[UTIL_PATH_SIZE];
2196
2197                                         util_strscpy(tmp, sizeof(tmp), filename);
2198                                         util_strscpyl(filename, sizeof(filename),
2199                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2200                                 }
2201                         }
2202                         attr_subst_subdir(filename, sizeof(filename));
2203
2204                         match = (stat(filename, &statbuf) == 0);
2205                         if (match && cur->key.mode > 0)
2206                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2207                         if (match && cur->key.op == OP_NOMATCH)
2208                                 goto nomatch;
2209                         if (!match && cur->key.op == OP_MATCH)
2210                                 goto nomatch;
2211                         break;
2212                 }
2213                 case TK_M_EVENT_TIMEOUT:
2214                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2215                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2216                         break;
2217                 case TK_M_PROGRAM: {
2218                         char program[UTIL_PATH_SIZE];
2219                         char **envp;
2220                         char result[UTIL_PATH_SIZE];
2221
2222                         free(event->program_result);
2223                         event->program_result = NULL;
2224                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2225                         envp = udev_device_get_properties_envp(event->dev);
2226                         log_debug("PROGRAM '%s' %s:%u\n",
2227                                   program,
2228                                   &rules->buf[rule->rule.filename_off],
2229                                   rule->rule.filename_line);
2230
2231                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2232                                 if (cur->key.op != OP_NOMATCH)
2233                                         goto nomatch;
2234                         } else {
2235                                 int count;
2236
2237                                 util_remove_trailing_chars(result, '\n');
2238                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2239                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2240                                         if (count > 0)
2241                                                 log_debug("%i character(s) replaced\n" , count);
2242                                 }
2243                                 event->program_result = strdup(result);
2244                                 if (cur->key.op == OP_NOMATCH)
2245                                         goto nomatch;
2246                         }
2247                         break;
2248                 }
2249                 case TK_M_IMPORT_FILE: {
2250                         char import[UTIL_PATH_SIZE];
2251
2252                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2253                         if (import_file_into_properties(event->dev, import) != 0)
2254                                 if (cur->key.op != OP_NOMATCH)
2255                                         goto nomatch;
2256                         break;
2257                 }
2258                 case TK_M_IMPORT_PROG: {
2259                         char import[UTIL_PATH_SIZE];
2260
2261                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2262                         log_debug("IMPORT '%s' %s:%u\n",
2263                                   import,
2264                                   &rules->buf[rule->rule.filename_off],
2265                                   rule->rule.filename_line);
2266
2267                         if (import_program_into_properties(event, import, sigmask) != 0)
2268                                 if (cur->key.op != OP_NOMATCH)
2269                                         goto nomatch;
2270                         break;
2271                 }
2272                 case TK_M_IMPORT_BUILTIN: {
2273                         char command[UTIL_PATH_SIZE];
2274
2275                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2276                                 /* check if we ran already */
2277                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2278                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2279                                                   udev_builtin_name(cur->key.builtin_cmd),
2280                                                   &rules->buf[rule->rule.filename_off],
2281                                                   rule->rule.filename_line);
2282                                         /* return the result from earlier run */
2283                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2284                                         if (cur->key.op != OP_NOMATCH)
2285                                                         goto nomatch;
2286                                         break;
2287                                 }
2288                                 /* mark as ran */
2289                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2290                         }
2291
2292                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2293                         log_debug("IMPORT builtin '%s' %s:%u\n",
2294                                   udev_builtin_name(cur->key.builtin_cmd),
2295                                   &rules->buf[rule->rule.filename_off],
2296                                   rule->rule.filename_line);
2297
2298                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2299                                 /* remember failure */
2300                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2301                                           udev_builtin_name(cur->key.builtin_cmd));
2302                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2303                                 if (cur->key.op != OP_NOMATCH)
2304                                         goto nomatch;
2305                         }
2306                         break;
2307                 }
2308                 case TK_M_IMPORT_DB: {
2309                         const char *key = &rules->buf[cur->key.value_off];
2310                         const char *value;
2311
2312                         value = udev_device_get_property_value(event->dev_db, key);
2313                         if (value != NULL) {
2314                                 struct udev_list_entry *entry;
2315
2316                                 entry = udev_device_add_property(event->dev, key, value);
2317                                 udev_list_entry_set_num(entry, true);
2318                         } else {
2319                                 if (cur->key.op != OP_NOMATCH)
2320                                         goto nomatch;
2321                         }
2322                         break;
2323                 }
2324                 case TK_M_IMPORT_CMDLINE: {
2325                         FILE *f;
2326                         bool imported = false;
2327
2328                         f = fopen("/proc/cmdline", "r");
2329                         if (f != NULL) {
2330                                 char cmdline[4096];
2331
2332                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2333                                         const char *key = &rules->buf[cur->key.value_off];
2334                                         char *pos;
2335
2336                                         pos = strstr(cmdline, key);
2337                                         if (pos != NULL) {
2338                                                 struct udev_list_entry *entry;
2339
2340                                                 pos += strlen(key);
2341                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2342                                                         /* we import simple flags as 'FLAG=1' */
2343                                                         entry = udev_device_add_property(event->dev, key, "1");
2344                                                         udev_list_entry_set_num(entry, true);
2345                                                         imported = true;
2346                                                 } else if (pos[0] == '=') {
2347                                                         const char *value;
2348
2349                                                         pos++;
2350                                                         value = pos;
2351                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2352                                                                 pos++;
2353                                                         pos[0] = '\0';
2354                                                         entry = udev_device_add_property(event->dev, key, value);
2355                                                         udev_list_entry_set_num(entry, true);
2356                                                         imported = true;
2357                                                 }
2358                                         }
2359                                 }
2360                                 fclose(f);
2361                         }
2362                         if (!imported && cur->key.op != OP_NOMATCH)
2363                                 goto nomatch;
2364                         break;
2365                 }
2366                 case TK_M_IMPORT_PARENT: {
2367                         char import[UTIL_PATH_SIZE];
2368
2369                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2370                         if (import_parent_into_properties(event->dev, import) != 0)
2371                                 if (cur->key.op != OP_NOMATCH)
2372                                         goto nomatch;
2373                         break;
2374                 }
2375                 case TK_M_RESULT:
2376                         if (match_key(rules, cur, event->program_result) != 0)
2377                                 goto nomatch;
2378                         break;
2379                 case TK_A_STRING_ESCAPE_NONE:
2380                         esc = ESCAPE_NONE;
2381                         break;
2382                 case TK_A_STRING_ESCAPE_REPLACE:
2383                         esc = ESCAPE_REPLACE;
2384                         break;
2385                 case TK_A_DB_PERSIST:
2386                         udev_device_set_db_persist(event->dev);
2387                         break;
2388                 case TK_A_INOTIFY_WATCH:
2389                         if (event->inotify_watch_final)
2390                                 break;
2391                         if (cur->key.op == OP_ASSIGN_FINAL)
2392                                 event->inotify_watch_final = true;
2393                         event->inotify_watch = cur->key.watch;
2394                         break;
2395                 case TK_A_DEVLINK_PRIO:
2396                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2397                         break;
2398                 case TK_A_OWNER: {
2399                         char owner[UTIL_NAME_SIZE];
2400
2401                         if (event->owner_final)
2402                                 break;
2403                         if (cur->key.op == OP_ASSIGN_FINAL)
2404                                 event->owner_final = true;
2405                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2406                         event->uid = util_lookup_user(event->udev, owner);
2407                         log_debug("OWNER %u %s:%u\n",
2408                                   event->uid,
2409                                   &rules->buf[rule->rule.filename_off],
2410                                   rule->rule.filename_line);
2411                         break;
2412                 }
2413                 case TK_A_GROUP: {
2414                         char group[UTIL_NAME_SIZE];
2415
2416                         if (event->group_final)
2417                                 break;
2418                         if (cur->key.op == OP_ASSIGN_FINAL)
2419                                 event->group_final = true;
2420                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2421                         event->gid = util_lookup_group(event->udev, group);
2422                         log_debug("GROUP %u %s:%u\n",
2423                                   event->gid,
2424                                   &rules->buf[rule->rule.filename_off],
2425                                   rule->rule.filename_line);
2426                         break;
2427                 }
2428                 case TK_A_MODE: {
2429                         char mode_str[UTIL_NAME_SIZE];
2430                         mode_t mode;
2431                         char *endptr;
2432
2433                         if (event->mode_final)
2434                                 break;
2435                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2436                         mode = strtol(mode_str, &endptr, 8);
2437                         if (endptr[0] != '\0') {
2438                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2439                                 break;
2440                         }
2441                         if (cur->key.op == OP_ASSIGN_FINAL)
2442                                 event->mode_final = true;
2443                         event->mode_set = true;
2444                         event->mode = mode;
2445                         log_debug("MODE %#o %s:%u\n",
2446                                   event->mode,
2447                                   &rules->buf[rule->rule.filename_off],
2448                                   rule->rule.filename_line);
2449                         break;
2450                 }
2451                 case TK_A_OWNER_ID:
2452                         if (event->owner_final)
2453                                 break;
2454                         if (cur->key.op == OP_ASSIGN_FINAL)
2455                                 event->owner_final = true;
2456                         event->uid = cur->key.uid;
2457                         log_debug("OWNER %u %s:%u\n",
2458                                   event->uid,
2459                                   &rules->buf[rule->rule.filename_off],
2460                                   rule->rule.filename_line);
2461                         break;
2462                 case TK_A_GROUP_ID:
2463                         if (event->group_final)
2464                                 break;
2465                         if (cur->key.op == OP_ASSIGN_FINAL)
2466                                 event->group_final = true;
2467                         event->gid = cur->key.gid;
2468                         log_debug("GROUP %u %s:%u\n",
2469                                   event->gid,
2470                                   &rules->buf[rule->rule.filename_off],
2471                                   rule->rule.filename_line);
2472                         break;
2473                 case TK_A_MODE_ID:
2474                         if (event->mode_final)
2475                                 break;
2476                         if (cur->key.op == OP_ASSIGN_FINAL)
2477                                 event->mode_final = true;
2478                         event->mode_set = true;
2479                         event->mode = cur->key.mode;
2480                         log_debug("MODE %#o %s:%u\n",
2481                                   event->mode,
2482                                   &rules->buf[rule->rule.filename_off],
2483                                   rule->rule.filename_line);
2484                         break;
2485                 case TK_A_ENV: {
2486                         const char *name = &rules->buf[cur->key.attr_off];
2487                         char *value = &rules->buf[cur->key.value_off];
2488
2489                         if (value[0] != '\0') {
2490                                 char temp_value[UTIL_NAME_SIZE];
2491                                 struct udev_list_entry *entry;
2492
2493                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2494                                 entry = udev_device_add_property(event->dev, name, temp_value);
2495                                 /* store in db, skip private keys */
2496                                 if (name[0] != '.')
2497                                         udev_list_entry_set_num(entry, true);
2498                         } else {
2499                                 udev_device_add_property(event->dev, name, NULL);
2500                         }
2501                         break;
2502                 }
2503                 case TK_A_TAG: {
2504                         char tag[UTIL_PATH_SIZE];
2505                         const char *p;
2506
2507                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2508                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2509                                 udev_device_cleanup_tags_list(event->dev);
2510                         for (p = tag; *p != '\0'; p++) {
2511                                 if ((*p >= 'a' && *p <= 'z') ||
2512                                     (*p >= 'A' && *p <= 'Z') ||
2513                                     (*p >= '0' && *p <= '9') ||
2514                                     *p == '-' || *p == '_')
2515                                         continue;
2516                                 log_error("ignoring invalid tag name '%s'\n", tag);
2517                                 break;
2518                         }
2519                         udev_device_add_tag(event->dev, tag);
2520                         break;
2521                 }
2522                 case TK_A_NAME: {
2523                         const char *name  = &rules->buf[cur->key.value_off];
2524
2525                         char name_str[UTIL_PATH_SIZE];
2526                         int count;
2527
2528                         if (event->name_final)
2529                                 break;
2530                         if (cur->key.op == OP_ASSIGN_FINAL)
2531                                 event->name_final = true;
2532                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2533                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2534                                 count = util_replace_chars(name_str, "/");
2535                                 if (count > 0)
2536                                         log_debug("%i character(s) replaced\n", count);
2537                         }
2538                         if (major(udev_device_get_devnum(event->dev))) {
2539                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2540
2541                                 if (strcmp(name_str, &udev_device_get_devnode(event->dev)[devlen]) != 0) {
2542                                         log_error("NAME=\"%s\" ignored, kernel device nodes "
2543                                             "can not be renamed; please fix it in %s:%u\n", name,
2544                                             &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2545                                         break;
2546                                 }
2547                         }
2548                         free(event->name);
2549                         event->name = strdup(name_str);
2550                         log_debug("NAME '%s' %s:%u\n",
2551                                   event->name,
2552                                   &rules->buf[rule->rule.filename_off],
2553                                   rule->rule.filename_line);
2554                         break;
2555                 }
2556                 case TK_A_DEVLINK: {
2557                         char temp[UTIL_PATH_SIZE];
2558                         char filename[UTIL_PATH_SIZE];
2559                         char *pos, *next;
2560                         int count = 0;
2561
2562                         if (event->devlink_final)
2563                                 break;
2564                         if (major(udev_device_get_devnum(event->dev)) == 0)
2565                                 break;
2566                         if (cur->key.op == OP_ASSIGN_FINAL)
2567                                 event->devlink_final = true;
2568                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2569                                 udev_device_cleanup_devlinks_list(event->dev);
2570
2571                         /* allow  multiple symlinks separated by spaces */
2572                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2573                         if (esc == ESCAPE_UNSET)
2574                                 count = util_replace_chars(temp, "/ ");
2575                         else if (esc == ESCAPE_REPLACE)
2576                                 count = util_replace_chars(temp, "/");
2577                         if (count > 0)
2578                                 log_debug("%i character(s) replaced\n" , count);
2579                         pos = temp;
2580                         while (isspace(pos[0]))
2581                                 pos++;
2582                         next = strchr(pos, ' ');
2583                         while (next != NULL) {
2584                                 next[0] = '\0';
2585                                 log_debug("LINK '%s' %s:%u\n", pos,
2586                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2587                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2588                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2589                                 while (isspace(next[1]))
2590                                         next++;
2591                                 pos = &next[1];
2592                                 next = strchr(pos, ' ');
2593                         }
2594                         if (pos[0] != '\0') {
2595                                 log_debug("LINK '%s' %s:%u\n", pos,
2596                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2597                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2598                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2599                         }
2600                         break;
2601                 }
2602                 case TK_A_ATTR: {
2603                         const char *key_name = &rules->buf[cur->key.attr_off];
2604                         char attr[UTIL_PATH_SIZE];
2605                         char value[UTIL_NAME_SIZE];
2606                         FILE *f;
2607
2608                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2609                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2610                         attr_subst_subdir(attr, sizeof(attr));
2611
2612                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2613                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2614                                   &rules->buf[rule->rule.filename_off],
2615                                   rule->rule.filename_line);
2616                         f = fopen(attr, "w");
2617                         if (f != NULL) {
2618                                 if (fprintf(f, "%s", value) <= 0)
2619                                         log_error("error writing ATTR{%s}: %m\n", attr);
2620                                 fclose(f);
2621                         } else {
2622                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2623                         }
2624                         break;
2625                 }
2626                 case TK_A_RUN_BUILTIN:
2627                 case TK_A_RUN_PROGRAM: {
2628                         struct udev_list_entry *entry;
2629
2630                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2631                                 udev_list_cleanup(&event->run_list);
2632                         log_debug("RUN '%s' %s:%u\n",
2633                                   &rules->buf[cur->key.value_off],
2634                                   &rules->buf[rule->rule.filename_off],
2635                                   rule->rule.filename_line);
2636                         entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2637                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2638                         break;
2639                 }
2640                 case TK_A_GOTO:
2641                         if (cur->key.rule_goto == 0)
2642                                 break;
2643                         cur = &rules->tokens[cur->key.rule_goto];
2644                         continue;
2645                 case TK_END:
2646                         return 0;
2647
2648                 case TK_M_PARENTS_MIN:
2649                 case TK_M_PARENTS_MAX:
2650                 case TK_M_MAX:
2651                 case TK_UNSET:
2652                         log_error("wrong type %u\n", cur->type);
2653                         goto nomatch;
2654                 }
2655
2656                 cur++;
2657                 continue;
2658         nomatch:
2659                 /* fast-forward to next rule */
2660                 cur = rule + rule->rule.token_count;
2661         }
2662 }
2663
2664 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2665 {
2666         struct token *cur;
2667         struct token *rule;
2668         uid_t uid = 0;
2669         gid_t gid = 0;
2670         mode_t mode = 0;
2671
2672         if (rules->tokens == NULL)
2673                 return;
2674
2675         cur = &rules->tokens[0];
2676         rule = cur;
2677         for (;;) {
2678                 switch (cur->type) {
2679                 case TK_RULE:
2680                         /* current rule */
2681                         rule = cur;
2682
2683                         /* skip rules without a static_node tag */
2684                         if (!rule->rule.has_static_node)
2685                                 goto next;
2686
2687                         uid = 0;
2688                         gid = 0;
2689                         mode = 0;
2690                         break;
2691                 case TK_A_OWNER_ID:
2692                         uid = cur->key.uid;
2693                         break;
2694                 case TK_A_GROUP_ID:
2695                         gid = cur->key.gid;
2696                         break;
2697                 case TK_A_MODE_ID:
2698                         mode = cur->key.mode;
2699                         break;
2700                 case TK_A_STATIC_NODE: {
2701                         char filename[UTIL_PATH_SIZE];
2702                         struct stat stats;
2703
2704                         /* we assure, that the permissions tokens are sorted before the static token */
2705                         if (mode == 0 && uid == 0 && gid == 0)
2706                                 goto next;
2707                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2708                                       &rules->buf[cur->key.value_off], NULL);
2709                         if (stat(filename, &stats) != 0)
2710                                 goto next;
2711                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2712                                 goto next;
2713                         if (mode == 0) {
2714                                 if (gid > 0)
2715                                         mode = 0660;
2716                                 else
2717                                         mode = 0600;
2718                         }
2719                         if (mode != (stats.st_mode & 01777)) {
2720                                 chmod(filename, mode);
2721                                 log_debug("chmod '%s' %#o\n", filename, mode);
2722                         }
2723
2724                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2725                                 chown(filename, uid, gid);
2726                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2727                         }
2728
2729                         utimensat(AT_FDCWD, filename, NULL, 0);
2730                         break;
2731                 }
2732                 case TK_END:
2733                         return;
2734                 }
2735
2736                 cur++;
2737                 continue;
2738 next:
2739                 /* fast-forward to next rule */
2740                 cur = rule + rule->rule.token_count;
2741                 continue;
2742         }
2743 }