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,                       /* val, bool */
 172         TK_A_GOTO,                      /* size_t */
 173
 174         TK_END,
 175 };
 176
 177 /* we try to pack stuff in a way that we take only 12 bytes per token */
 178 struct token {
 179         union {
 180                 unsigned char type;                /* same in rule and key */
 181                 struct {
 182                         enum token_type type:8;
 183                         bool can_set_name:1;
 184                         bool has_static_node:1;
 185                         unsigned int unused:6;
 186                         unsigned short token_count;
 187                         unsigned int label_off;
 188                         unsigned short filename_off;
 189                         unsigned short filename_line;
 190                 } rule;
 191                 struct {
 192                         enum token_type type:8;
 193                         enum operation_type op:8;
 194                         enum string_glob_type glob:8;
 195                         enum string_subst_type subst:4;
 196                         enum string_subst_type attrsubst:4;
 197                         unsigned int value_off;
 198                         union {
 199                                 unsigned int attr_off;
 200                                 int devlink_unique;
 201                                 unsigned int rule_goto;
 202                                 mode_t  mode;
 203                                 uid_t uid;
 204                                 gid_t gid;
 205                                 int devlink_prio;
 206                                 int event_timeout;
 207                                 int watch;
 208                                 enum udev_builtin_cmd builtin_cmd;
 209                         };
 210                 } key;
 211         };
 212 };
 213
 214 #define MAX_TK                64
 215 struct rule_tmp {
 216         struct udev_rules *rules;
 217         struct token rule;
 218         struct token token[MAX_TK];
 219         unsigned int token_cur;
 220 };
 221
 222 #ifdef DEBUG
 223 static const char *operation_str(enum operation_type type)
 224 {
 225         static const char *operation_strs[] = {
 226                 [OP_UNSET] =            "UNSET",
 227                 [OP_MATCH] =            "match",
 228                 [OP_NOMATCH] =          "nomatch",
 229                 [OP_MATCH_MAX] =        "MATCH_MAX",
 230
 231                 [OP_ADD] =              "add",
 232                 [OP_ASSIGN] =           "assign",
 233                 [OP_ASSIGN_FINAL] =     "assign-final",
 234 }        ;
 235
 236         return operation_strs[type];
 237 }
 238
 239 static const char *string_glob_str(enum string_glob_type type)
 240 {
 241         static const char *string_glob_strs[] = {
 242                 [GL_UNSET] =            "UNSET",
 243                 [GL_PLAIN] =            "plain",
 244                 [GL_GLOB] =             "glob",
 245                 [GL_SPLIT] =            "split",
 246                 [GL_SPLIT_GLOB] =       "split-glob",
 247                 [GL_SOMETHING] =        "split-glob",
 248         };
 249
 250         return string_glob_strs[type];
 251 }
 252
 253 static const char *token_str(enum token_type type)
 254 {
 255         static const char *token_strs[] = {
 256                 [TK_UNSET] =                    "UNSET",
 257                 [TK_RULE] =                     "RULE",
 258
 259                 [TK_M_ACTION] =                 "M ACTION",
 260                 [TK_M_DEVPATH] =                "M DEVPATH",
 261                 [TK_M_KERNEL] =                 "M KERNEL",
 262                 [TK_M_DEVLINK] =                "M DEVLINK",
 263                 [TK_M_NAME] =                   "M NAME",
 264                 [TK_M_ENV] =                    "M ENV",
 265                 [TK_M_TAG] =                    "M TAG",
 266                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 267                 [TK_M_DRIVER] =                 "M DRIVER",
 268                 [TK_M_WAITFOR] =                "M WAITFOR",
 269                 [TK_M_ATTR] =                   "M ATTR",
 270
 271                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 272                 [TK_M_KERNELS] =                "M KERNELS",
 273                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 274                 [TK_M_DRIVERS] =                "M DRIVERS",
 275                 [TK_M_ATTRS] =                  "M ATTRS",
 276                 [TK_M_TAGS] =                   "M TAGS",
 277                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 278
 279                 [TK_M_TEST] =                   "M TEST",
 280                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 281                 [TK_M_PROGRAM] =                "M PROGRAM",
 282                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 283                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 284                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 285                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 286                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 287                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 288                 [TK_M_RESULT] =                 "M RESULT",
 289                 [TK_M_MAX] =                    "M MAX",
 290
 291                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 292                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 293                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 294                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 295                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 296                 [TK_A_OWNER] =                  "A OWNER",
 297                 [TK_A_GROUP] =                  "A GROUP",
 298                 [TK_A_MODE] =                   "A MODE",
 299                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 300                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 301                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 302                 [TK_A_MODE_ID] =                "A MODE_ID",
 303                 [TK_A_ENV] =                    "A ENV",
 304                 [TK_A_TAG] =                    "A ENV",
 305                 [TK_A_NAME] =                   "A NAME",
 306                 [TK_A_DEVLINK] =                "A DEVLINK",
 307                 [TK_A_ATTR] =                   "A ATTR",
 308                 [TK_A_RUN] =                    "A RUN",
 309                 [TK_A_GOTO] =                   "A GOTO",
 310
 311                 [TK_END] =                      "END",
 312         };
 313
 314         return token_strs[type];
 315 }
 316
 317 static void dump_token(struct udev_rules *rules, struct token *token)
 318 {
 319         enum token_type type = token->type;
 320         enum operation_type op = token->key.op;
 321         enum string_glob_type glob = token->key.glob;
 322         const char *value = &rules->buf[token->key.value_off];
 323         const char *attr = &rules->buf[token->key.attr_off];
 324
 325         switch (type) {
 326         case TK_RULE:
 327                 {
 328                         const char *tks_ptr = (char *)rules->tokens;
 329                         const char *tk_ptr = (char *)token;
 330                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 331
 332                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 333                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 334                                   idx, token->rule.token_count,
 335                                   &rules->buf[token->rule.label_off]);
 336                         break;
 337                 }
 338         case TK_M_ACTION:
 339         case TK_M_DEVPATH:
 340         case TK_M_KERNEL:
 341         case TK_M_SUBSYSTEM:
 342         case TK_M_DRIVER:
 343         case TK_M_WAITFOR:
 344         case TK_M_DEVLINK:
 345         case TK_M_NAME:
 346         case TK_M_KERNELS:
 347         case TK_M_SUBSYSTEMS:
 348         case TK_M_DRIVERS:
 349         case TK_M_TAGS:
 350         case TK_M_PROGRAM:
 351         case TK_M_IMPORT_FILE:
 352         case TK_M_IMPORT_PROG:
 353         case TK_M_IMPORT_DB:
 354         case TK_M_IMPORT_CMDLINE:
 355         case TK_M_IMPORT_PARENT:
 356         case TK_M_RESULT:
 357         case TK_A_NAME:
 358         case TK_A_DEVLINK:
 359         case TK_A_OWNER:
 360         case TK_A_GROUP:
 361         case TK_A_MODE:
 362         case TK_A_RUN:
 363                 log_debug("%s %s '%s'(%s)\n",
 364                           token_str(type), operation_str(op), value, string_glob_str(glob));
 365                 break;
 366         case TK_M_IMPORT_BUILTIN:
 367                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 368                 break;
 369         case TK_M_ATTR:
 370         case TK_M_ATTRS:
 371         case TK_M_ENV:
 372         case TK_A_ATTR:
 373         case TK_A_ENV:
 374                 log_debug("%s %s '%s' '%s'(%s)\n",
 375                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 376                 break;
 377         case TK_M_TAG:
 378         case TK_A_TAG:
 379                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 380                 break;
 381         case TK_A_STRING_ESCAPE_NONE:
 382         case TK_A_STRING_ESCAPE_REPLACE:
 383         case TK_A_DB_PERSIST:
 384                 log_debug("%s\n", token_str(type));
 385                 break;
 386         case TK_M_TEST:
 387                 log_debug("%s %s '%s'(%s) %#o\n",
 388                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 389                 break;
 390         case TK_A_INOTIFY_WATCH:
 391                 log_debug("%s %u\n", token_str(type), token->key.watch);
 392                 break;
 393         case TK_A_DEVLINK_PRIO:
 394                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 395                 break;
 396         case TK_A_OWNER_ID:
 397                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 398                 break;
 399         case TK_A_GROUP_ID:
 400                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 401                 break;
 402         case TK_A_MODE_ID:
 403                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 404                 break;
 405         case TK_A_STATIC_NODE:
 406                 log_debug("%s '%s'\n", token_str(type), value);
 407                 break;
 408         case TK_M_EVENT_TIMEOUT:
 409                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 410                 break;
 411         case TK_A_GOTO:
 412                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 413                 break;
 414         case TK_END:
 415                 log_debug("* %s\n", token_str(type));
 416                 break;
 417         case TK_M_PARENTS_MIN:
 418         case TK_M_PARENTS_MAX:
 419         case TK_M_MAX:
 420         case TK_UNSET:
 421                 log_debug("unknown type %u\n", type);
 422                 break;
 423         }
 424 }
 425
 426 static void dump_rules(struct udev_rules *rules)
 427 {
 428         unsigned int i;
 429
 430         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 431                   rules->token_cur,
 432                   rules->token_cur * sizeof(struct token),
 433                   rules->buf_count,
 434                   rules->buf_cur);
 435         for(i = 0; i < rules->token_cur; i++)
 436                 dump_token(rules, &rules->tokens[i]);
 437 }
 438 #else
 439 static inline const char *operation_str(enum operation_type type) { return NULL; }
 440 static inline const char *token_str(enum token_type type) { return NULL; }
 441 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 442 static inline void dump_rules(struct udev_rules *rules) {}
 443 #endif /* DEBUG */
 444
 445 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 446 {
 447         int off;
 448
 449         /* grow buffer if needed */
 450         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 451                 char *buf;
 452                 unsigned int add;
 453
 454                 /* double the buffer size */
 455                 add = rules->buf_max;
 456                 if (add < bytes * 8)
 457                         add = bytes * 8;
 458
 459                 buf = realloc(rules->buf, rules->buf_max + add);
 460                 if (buf == NULL)
 461                         return -1;
 462                 rules->buf = buf;
 463                 rules->buf_max += add;
 464         }
 465         off = rules->buf_cur;
 466         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 467         rules->buf_cur += bytes;
 468         rules->buf_count++;
 469         return off;
 470 }
 471
 472 static int add_string(struct udev_rules *rules, const char *str)
 473 {
 474         unsigned int node_idx;
 475         struct trie_node *new_node;
 476         unsigned int new_node_idx;
 477         unsigned char key;
 478         unsigned short len;
 479         unsigned int depth;
 480         unsigned int off;
 481         struct trie_node *parent;
 482
 483         /* walk trie, start from last character of str to find matching tails */
 484         len = strlen(str);
 485         key = str[len-1];
 486         node_idx = 0;
 487         for (depth = 0; depth <= len; depth++) {
 488                 struct trie_node *node;
 489                 unsigned int child_idx;
 490
 491                 node = &rules->trie_nodes[node_idx];
 492                 off = node->value_off + node->value_len - len;
 493
 494                 /* match against current node */
 495                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 496                         return off;
 497
 498                 /* lookup child node */
 499                 key = str[len - 1 - depth];
 500                 child_idx = node->child_idx;
 501                 while (child_idx > 0) {
 502                         struct trie_node *child;
 503
 504                         child = &rules->trie_nodes[child_idx];
 505                         if (child->key == key)
 506                                 break;
 507                         child_idx = child->next_child_idx;
 508                 }
 509                 if (child_idx == 0)
 510                         break;
 511                 node_idx = child_idx;
 512         }
 513
 514         /* string not found, add it */
 515         off = add_new_string(rules, str, len + 1);
 516
 517         /* grow trie nodes if needed */
 518         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 519                 struct trie_node *nodes;
 520                 unsigned int add;
 521
 522                 /* double the buffer size */
 523                 add = rules->trie_nodes_max;
 524                 if (add < 8)
 525                         add = 8;
 526
 527                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 528                 if (nodes == NULL)
 529                         return -1;
 530                 rules->trie_nodes = nodes;
 531                 rules->trie_nodes_max += add;
 532         }
 533
 534         /* get a new node */
 535         new_node_idx = rules->trie_nodes_cur;
 536         rules->trie_nodes_cur++;
 537         new_node = &rules->trie_nodes[new_node_idx];
 538         memset(new_node, 0x00, sizeof(struct trie_node));
 539         new_node->value_off = off;
 540         new_node->value_len = len;
 541         new_node->key = key;
 542
 543         /* join the parent's child list */
 544         parent = &rules->trie_nodes[node_idx];
 545         if (parent->child_idx == 0) {
 546                 parent->child_idx = new_node_idx;
 547         } else {
 548                 struct trie_node *last_child;
 549
 550                 last_child = &rules->trie_nodes[parent->last_child_idx];
 551                 last_child->next_child_idx = new_node_idx;
 552         }
 553         parent->last_child_idx = new_node_idx;
 554         return off;
 555 }
 556
 557 static int add_token(struct udev_rules *rules, struct token *token)
 558 {
 559         /* grow buffer if needed */
 560         if (rules->token_cur+1 >= rules->token_max) {
 561                 struct token *tokens;
 562                 unsigned int add;
 563
 564                 /* double the buffer size */
 565                 add = rules->token_max;
 566                 if (add < 8)
 567                         add = 8;
 568
 569                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 570                 if (tokens == NULL)
 571                         return -1;
 572                 rules->tokens = tokens;
 573                 rules->token_max += add;
 574         }
 575         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 576         rules->token_cur++;
 577         return 0;
 578 }
 579
 580 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 581 {
 582         unsigned int i;
 583         uid_t uid;
 584         unsigned int off;
 585
 586         /* lookup, if we know it already */
 587         for (i = 0; i < rules->uids_cur; i++) {
 588                 off = rules->uids[i].name_off;
 589                 if (strcmp(&rules->buf[off], owner) == 0) {
 590                         uid = rules->uids[i].uid;
 591                         return uid;
 592                 }
 593         }
 594         uid = util_lookup_user(rules->udev, owner);
 595
 596         /* grow buffer if needed */
 597         if (rules->uids_cur+1 >= rules->uids_max) {
 598                 struct uid_gid *uids;
 599                 unsigned int add;
 600
 601                 /* double the buffer size */
 602                 add = rules->uids_max;
 603                 if (add < 1)
 604                         add = 8;
 605
 606                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 607                 if (uids == NULL)
 608                         return uid;
 609                 rules->uids = uids;
 610                 rules->uids_max += add;
 611         }
 612         rules->uids[rules->uids_cur].uid = uid;
 613         off = add_string(rules, owner);
 614         if (off <= 0)
 615                 return uid;
 616         rules->uids[rules->uids_cur].name_off = off;
 617         rules->uids_cur++;
 618         return uid;
 619 }
 620
 621 static gid_t add_gid(struct udev_rules *rules, const char *group)
 622 {
 623         unsigned int i;
 624         gid_t gid;
 625         unsigned int off;
 626
 627         /* lookup, if we know it already */
 628         for (i = 0; i < rules->gids_cur; i++) {
 629                 off = rules->gids[i].name_off;
 630                 if (strcmp(&rules->buf[off], group) == 0) {
 631                         gid = rules->gids[i].gid;
 632                         return gid;
 633                 }
 634         }
 635         gid = util_lookup_group(rules->udev, group);
 636
 637         /* grow buffer if needed */
 638         if (rules->gids_cur+1 >= rules->gids_max) {
 639                 struct uid_gid *gids;
 640                 unsigned int add;
 641
 642                 /* double the buffer size */
 643                 add = rules->gids_max;
 644                 if (add < 1)
 645                         add = 8;
 646
 647                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 648                 if (gids == NULL)
 649                         return gid;
 650                 rules->gids = gids;
 651                 rules->gids_max += add;
 652         }
 653         rules->gids[rules->gids_cur].gid = gid;
 654         off = add_string(rules, group);
 655         if (off <= 0)
 656                 return gid;
 657         rules->gids[rules->gids_cur].name_off = off;
 658         rules->gids_cur++;
 659         return gid;
 660 }
 661
 662 static int import_property_from_string(struct udev_device *dev, char *line)
 663 {
 664         struct udev *udev = udev_device_get_udev(dev);
 665         char *key;
 666         char *val;
 667         size_t len;
 668
 669         /* find key */
 670         key = line;
 671         while (isspace(key[0]))
 672                 key++;
 673
 674         /* comment or empty line */
 675         if (key[0] == '#' || key[0] == '\0')
 676                 return -1;
 677
 678         /* split key/value */
 679         val = strchr(key, '=');
 680         if (val == NULL)
 681                 return -1;
 682         val[0] = '\0';
 683         val++;
 684
 685         /* find value */
 686         while (isspace(val[0]))
 687                 val++;
 688
 689         /* terminate key */
 690         len = strlen(key);
 691         if (len == 0)
 692                 return -1;
 693         while (isspace(key[len-1]))
 694                 len--;
 695         key[len] = '\0';
 696
 697         /* terminate value */
 698         len = strlen(val);
 699         if (len == 0)
 700                 return -1;
 701         while (isspace(val[len-1]))
 702                 len--;
 703         val[len] = '\0';
 704
 705         if (len == 0)
 706                 return -1;
 707
 708         /* unquote */
 709         if (val[0] == '"' || val[0] == '\'') {
 710                 if (val[len-1] != val[0]) {
 711                         log_debug("inconsistent quoting: '%s', skip\n", line);
 712                         return -1;
 713                 }
 714                 val[len-1] = '\0';
 715                 val++;
 716         }
 717
 718         /* handle device, renamed by external tool, returning new path */
 719         if (strcmp(key, "DEVPATH") == 0) {
 720                 char syspath[UTIL_PATH_SIZE];
 721
 722                 log_debug("updating devpath from '%s' to '%s'\n",
 723                           udev_device_get_devpath(dev), val);
 724                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 725                 udev_device_set_syspath(dev, syspath);
 726         } else {
 727                 struct udev_list_entry *entry;
 728
 729                 entry = udev_device_add_property(dev, key, val);
 730                 /* store in db, skip private keys */
 731                 if (key[0] != '.')
 732                         udev_list_entry_set_num(entry, true);
 733         }
 734         return 0;
 735 }
 736
 737 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 738 {
 739         FILE *f;
 740         char line[UTIL_LINE_SIZE];
 741
 742         f = fopen(filename, "r");
 743         if (f == NULL)
 744                 return -1;
 745         while (fgets(line, sizeof(line), f) != NULL)
 746                 import_property_from_string(dev, line);
 747         fclose(f);
 748         return 0;
 749 }
 750
 751 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 752 {
 753         struct udev_device *dev = event->dev;
 754         char **envp;
 755         char result[UTIL_LINE_SIZE];
 756         char *line;
 757         int err;
 758
 759         envp = udev_device_get_properties_envp(dev);
 760         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 761         if (err < 0)
 762                 return err;
 763
 764         line = result;
 765         while (line != NULL) {
 766                 char *pos;
 767
 768                 pos = strchr(line, '\n');
 769                 if (pos != NULL) {
 770                         pos[0] = '\0';
 771                         pos = &pos[1];
 772                 }
 773                 import_property_from_string(dev, line);
 774                 line = pos;
 775         }
 776         return 0;
 777 }
 778
 779 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 780 {
 781         struct udev *udev = udev_device_get_udev(dev);
 782         struct udev_device *dev_parent;
 783         struct udev_list_entry *list_entry;
 784
 785         dev_parent = udev_device_get_parent(dev);
 786         if (dev_parent == NULL)
 787                 return -1;
 788
 789         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 790                 const char *key = udev_list_entry_get_name(list_entry);
 791                 const char *val = udev_list_entry_get_value(list_entry);
 792
 793                 if (fnmatch(filter, key, 0) == 0) {
 794                         struct udev_list_entry *entry;
 795
 796                         entry = udev_device_add_property(dev, key, val);
 797                         /* store in db, skip private keys */
 798                         if (key[0] != '.')
 799                                 udev_list_entry_set_num(entry, true);
 800                 }
 801         }
 802         return 0;
 803 }
 804
 805 #define WAIT_LOOP_PER_SECOND                50
 806 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 807 {
 808         struct udev *udev = udev_device_get_udev(dev);
 809         char filepath[UTIL_PATH_SIZE];
 810         char devicepath[UTIL_PATH_SIZE];
 811         struct stat stats;
 812         int loop = timeout * WAIT_LOOP_PER_SECOND;
 813
 814         /* a relative path is a device attribute */
 815         devicepath[0] = '\0';
 816         if (file[0] != '/') {
 817                 util_strscpyl(devicepath, sizeof(devicepath),
 818                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 819                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 820                 file = filepath;
 821         }
 822
 823         while (--loop) {
 824                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 825
 826                 /* lookup file */
 827                 if (stat(file, &stats) == 0) {
 828                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 829                         return 0;
 830                 }
 831                 /* make sure, the device did not disappear in the meantime */
 832                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 833                         log_debug("device disappeared while waiting for '%s'\n", file);
 834                         return -2;
 835                 }
 836                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 837                 nanosleep(&duration, NULL);
 838         }
 839         log_debug("waiting for '%s' failed\n", file);
 840         return -1;
 841 }
 842
 843 static int attr_subst_subdir(char *attr, size_t len)
 844 {
 845         bool found = false;
 846
 847         if (strstr(attr, "/*/")) {
 848                 char *pos;
 849                 char dirname[UTIL_PATH_SIZE];
 850                 const char *tail;
 851                 DIR *dir;
 852
 853                 util_strscpy(dirname, sizeof(dirname), attr);
 854                 pos = strstr(dirname, "/*/");
 855                 if (pos == NULL)
 856                         return -1;
 857                 pos[0] = '\0';
 858                 tail = &pos[2];
 859                 dir = opendir(dirname);
 860                 if (dir != NULL) {
 861                         struct dirent *dent;
 862
 863                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 864                                 struct stat stats;
 865
 866                                 if (dent->d_name[0] == '.')
 867                                         continue;
 868                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 869                                 if (stat(attr, &stats) == 0) {
 870                                         found = true;
 871                                         break;
 872                                 }
 873                         }
 874                         closedir(dir);
 875                 }
 876         }
 877
 878         return found;
 879 }
 880
 881 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 882 {
 883         char *linepos;
 884         char *temp;
 885
 886         linepos = *line;
 887         if (linepos == NULL || linepos[0] == '\0')
 888                 return -1;
 889
 890         /* skip whitespace */
 891         while (isspace(linepos[0]) || linepos[0] == ',')
 892                 linepos++;
 893
 894         /* get the key */
 895         if (linepos[0] == '\0')
 896                 return -1;
 897         *key = linepos;
 898
 899         for (;;) {
 900                 linepos++;
 901                 if (linepos[0] == '\0')
 902                         return -1;
 903                 if (isspace(linepos[0]))
 904                         break;
 905                 if (linepos[0] == '=')
 906                         break;
 907                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 908                         if (linepos[1] == '=')
 909                                 break;
 910         }
 911
 912         /* remember end of key */
 913         temp = linepos;
 914
 915         /* skip whitespace after key */
 916         while (isspace(linepos[0]))
 917                 linepos++;
 918         if (linepos[0] == '\0')
 919                 return -1;
 920
 921         /* get operation type */
 922         if (linepos[0] == '=' && linepos[1] == '=') {
 923                 *op = OP_MATCH;
 924                 linepos += 2;
 925         } else if (linepos[0] == '!' && linepos[1] == '=') {
 926                 *op = OP_NOMATCH;
 927                 linepos += 2;
 928         } else if (linepos[0] == '+' && linepos[1] == '=') {
 929                 *op = OP_ADD;
 930                 linepos += 2;
 931         } else if (linepos[0] == '=') {
 932                 *op = OP_ASSIGN;
 933                 linepos++;
 934         } else if (linepos[0] == ':' && linepos[1] == '=') {
 935                 *op = OP_ASSIGN_FINAL;
 936                 linepos += 2;
 937         } else
 938                 return -1;
 939
 940         /* terminate key */
 941         temp[0] = '\0';
 942
 943         /* skip whitespace after operator */
 944         while (isspace(linepos[0]))
 945                 linepos++;
 946         if (linepos[0] == '\0')
 947                 return -1;
 948
 949         /* get the value */
 950         if (linepos[0] == '"')
 951                 linepos++;
 952         else
 953                 return -1;
 954         *value = linepos;
 955
 956         /* terminate */
 957         temp = strchr(linepos, '"');
 958         if (!temp)
 959                 return -1;
 960         temp[0] = '\0';
 961         temp++;
 962
 963         /* move line to next key */
 964         *line = temp;
 965         return 0;
 966 }
 967
 968 /* extract possible KEY{attr} */
 969 static char *get_key_attribute(struct udev *udev, char *str)
 970 {
 971         char *pos;
 972         char *attr;
 973
 974         attr = strchr(str, '{');
 975         if (attr != NULL) {
 976                 attr++;
 977                 pos = strchr(attr, '}');
 978                 if (pos == NULL) {
 979                         log_error("missing closing brace for format\n");
 980                         return NULL;
 981                 }
 982                 pos[0] = '\0';
 983                 return attr;
 984         }
 985         return NULL;
 986 }
 987
 988 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 989                         enum operation_type op,
 990                         const char *value, const void *data)
 991 {
 992         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 993         const char *attr = NULL;
 994
 995         memset(token, 0x00, sizeof(struct token));
 996
 997         switch (type) {
 998         case TK_M_ACTION:
 999         case TK_M_DEVPATH:
1000         case TK_M_KERNEL:
1001         case TK_M_SUBSYSTEM:
1002         case TK_M_DRIVER:
1003         case TK_M_WAITFOR:
1004         case TK_M_DEVLINK:
1005         case TK_M_NAME:
1006         case TK_M_KERNELS:
1007         case TK_M_SUBSYSTEMS:
1008         case TK_M_DRIVERS:
1009         case TK_M_TAGS:
1010         case TK_M_PROGRAM:
1011         case TK_M_IMPORT_FILE:
1012         case TK_M_IMPORT_PROG:
1013         case TK_M_IMPORT_DB:
1014         case TK_M_IMPORT_CMDLINE:
1015         case TK_M_IMPORT_PARENT:
1016         case TK_M_RESULT:
1017         case TK_A_OWNER:
1018         case TK_A_GROUP:
1019         case TK_A_MODE:
1020         case TK_A_NAME:
1021         case TK_A_GOTO:
1022         case TK_M_TAG:
1023         case TK_A_TAG:
1024                 token->key.value_off = add_string(rule_tmp->rules, value);
1025                 break;
1026         case TK_M_IMPORT_BUILTIN:
1027                 token->key.value_off = add_string(rule_tmp->rules, value);
1028                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1029                 break;
1030         case TK_M_ENV:
1031         case TK_M_ATTR:
1032         case TK_M_ATTRS:
1033         case TK_A_ATTR:
1034         case TK_A_ENV:
1035                 attr = data;
1036                 token->key.value_off = add_string(rule_tmp->rules, value);
1037                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1038                 break;
1039         case TK_A_DEVLINK:
1040                 token->key.value_off = add_string(rule_tmp->rules, value);
1041                 token->key.devlink_unique = *(int *)data;
1042                 break;
1043         case TK_M_TEST:
1044                 token->key.value_off = add_string(rule_tmp->rules, value);
1045                 if (data != NULL)
1046                         token->key.mode = *(mode_t *)data;
1047                 break;
1048         case TK_A_STRING_ESCAPE_NONE:
1049         case TK_A_STRING_ESCAPE_REPLACE:
1050         case TK_A_DB_PERSIST:
1051                 break;
1052         case TK_A_RUN:
1053                 token->key.value_off = add_string(rule_tmp->rules, value);
1054                 break;
1055         case TK_A_INOTIFY_WATCH:
1056         case TK_A_DEVLINK_PRIO:
1057                 token->key.devlink_prio = *(int *)data;
1058                 break;
1059         case TK_A_OWNER_ID:
1060                 token->key.uid = *(uid_t *)data;
1061                 break;
1062         case TK_A_GROUP_ID:
1063                 token->key.gid = *(gid_t *)data;
1064                 break;
1065         case TK_A_MODE_ID:
1066                 token->key.mode = *(mode_t *)data;
1067                 break;
1068         case TK_A_STATIC_NODE:
1069                 token->key.value_off = add_string(rule_tmp->rules, value);
1070                 break;
1071         case TK_M_EVENT_TIMEOUT:
1072                 token->key.event_timeout = *(int *)data;
1073                 break;
1074         case TK_RULE:
1075         case TK_M_PARENTS_MIN:
1076         case TK_M_PARENTS_MAX:
1077         case TK_M_MAX:
1078         case TK_END:
1079         case TK_UNSET:
1080                 log_error("wrong type %u\n", type);
1081                 return -1;
1082         }
1083
1084         if (value != NULL && type < TK_M_MAX) {
1085                 /* check if we need to split or call fnmatch() while matching rules */
1086                 enum string_glob_type glob;
1087                 int has_split;
1088                 int has_glob;
1089
1090                 has_split = (strchr(value, '|') != NULL);
1091                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1092                 if (has_split && has_glob) {
1093                         glob = GL_SPLIT_GLOB;
1094                 } else if (has_split) {
1095                         glob = GL_SPLIT;
1096                 } else if (has_glob) {
1097                         if (strcmp(value, "?*") == 0)
1098                                 glob = GL_SOMETHING;
1099                         else
1100                                 glob = GL_GLOB;
1101                 } else {
1102                         glob = GL_PLAIN;
1103                 }
1104                 token->key.glob = glob;
1105         }
1106
1107         if (value != NULL && type > TK_M_MAX) {
1108                 /* check if assigned value has substitution chars */
1109                 if (value[0] == '[')
1110                         token->key.subst = SB_SUBSYS;
1111                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1112                         token->key.subst = SB_FORMAT;
1113                 else
1114                         token->key.subst = SB_NONE;
1115         }
1116
1117         if (attr != NULL) {
1118                 /* check if property/attribut name has substitution chars */
1119                 if (attr[0] == '[')
1120                         token->key.attrsubst = SB_SUBSYS;
1121                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1122                         token->key.attrsubst = SB_FORMAT;
1123                 else
1124                         token->key.attrsubst = SB_NONE;
1125         }
1126
1127         token->key.type = type;
1128         token->key.op = op;
1129         rule_tmp->token_cur++;
1130         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1131                 log_error("temporary rule array too small\n");
1132                 return -1;
1133         }
1134         return 0;
1135 }
1136
1137 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1138 {
1139         unsigned int i;
1140         unsigned int start = 0;
1141         unsigned int end = rule_tmp->token_cur;
1142
1143         for (i = 0; i < rule_tmp->token_cur; i++) {
1144                 enum token_type next_val = TK_UNSET;
1145                 unsigned int next_idx = 0;
1146                 unsigned int j;
1147
1148                 /* find smallest value */
1149                 for (j = start; j < end; j++) {
1150                         if (rule_tmp->token[j].type == TK_UNSET)
1151                                 continue;
1152                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1153                                 next_val = rule_tmp->token[j].type;
1154                                 next_idx = j;
1155                         }
1156                 }
1157
1158                 /* add token and mark done */
1159                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1160                         return -1;
1161                 rule_tmp->token[next_idx].type = TK_UNSET;
1162
1163                 /* shrink range */
1164                 if (next_idx == start)
1165                         start++;
1166                 if (next_idx+1 == end)
1167                         end--;
1168         }
1169         return 0;
1170 }
1171
1172 static int add_rule(struct udev_rules *rules, char *line,
1173                     const char *filename, unsigned int filename_off, unsigned int lineno)
1174 {
1175         char *linepos;
1176         char *attr;
1177         struct rule_tmp rule_tmp;
1178
1179         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1180         rule_tmp.rules = rules;
1181         rule_tmp.rule.type = TK_RULE;
1182         rule_tmp.rule.rule.filename_off = filename_off;
1183         rule_tmp.rule.rule.filename_line = lineno;
1184
1185         linepos = line;
1186         for (;;) {
1187                 char *key;
1188                 char *value;
1189                 enum operation_type op;
1190
1191                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1192                         break;
1193
1194                 if (strcmp(key, "ACTION") == 0) {
1195                         if (op > OP_MATCH_MAX) {
1196                                 log_error("invalid ACTION operation\n");
1197                                 goto invalid;
1198                         }
1199                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1200                         continue;
1201                 }
1202
1203                 if (strcmp(key, "DEVPATH") == 0) {
1204                         if (op > OP_MATCH_MAX) {
1205                                 log_error("invalid DEVPATH operation\n");
1206                                 goto invalid;
1207                         }
1208                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1209                         continue;
1210                 }
1211
1212                 if (strcmp(key, "KERNEL") == 0) {
1213                         if (op > OP_MATCH_MAX) {
1214                                 log_error("invalid KERNEL operation\n");
1215                                 goto invalid;
1216                         }
1217                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1218                         continue;
1219                 }
1220
1221                 if (strcmp(key, "SUBSYSTEM") == 0) {
1222                         if (op > OP_MATCH_MAX) {
1223                                 log_error("invalid SUBSYSTEM operation\n");
1224                                 goto invalid;
1225                         }
1226                         /* bus, class, subsystem events should all be the same */
1227                         if (strcmp(value, "subsystem") == 0 ||
1228                             strcmp(value, "bus") == 0 ||
1229                             strcmp(value, "class") == 0) {
1230                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1231                                         log_error("'%s' must be specified as 'subsystem' \n"
1232                                             "please fix it in %s:%u", value, filename, lineno);
1233                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1234                         } else
1235                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1236                         continue;
1237                 }
1238
1239                 if (strcmp(key, "DRIVER") == 0) {
1240                         if (op > OP_MATCH_MAX) {
1241                                 log_error("invalid DRIVER operation\n");
1242                                 goto invalid;
1243                         }
1244                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1245                         continue;
1246                 }
1247
1248                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1249                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1250                         if (attr == NULL) {
1251                                 log_error("error parsing ATTR attribute\n");
1252                                 goto invalid;
1253                         }
1254                         if (op < OP_MATCH_MAX) {
1255                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1256                         } else {
1257                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1258                         }
1259                         continue;
1260                 }
1261
1262                 if (strcmp(key, "KERNELS") == 0) {
1263                         if (op > OP_MATCH_MAX) {
1264                                 log_error("invalid KERNELS operation\n");
1265                                 goto invalid;
1266                         }
1267                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1268                         continue;
1269                 }
1270
1271                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1272                         if (op > OP_MATCH_MAX) {
1273                                 log_error("invalid SUBSYSTEMS operation\n");
1274                                 goto invalid;
1275                         }
1276                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1277                         continue;
1278                 }
1279
1280                 if (strcmp(key, "DRIVERS") == 0) {
1281                         if (op > OP_MATCH_MAX) {
1282                                 log_error("invalid DRIVERS operation\n");
1283                                 goto invalid;
1284                         }
1285                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1286                         continue;
1287                 }
1288
1289                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1290                         if (op > OP_MATCH_MAX) {
1291                                 log_error("invalid ATTRS operation\n");
1292                                 goto invalid;
1293                         }
1294                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1295                         if (attr == NULL) {
1296                                 log_error("error parsing ATTRS attribute\n");
1297                                 goto invalid;
1298                         }
1299                         if (strncmp(attr, "device/", 7) == 0)
1300                                 log_error("the 'device' link may not be available in a future kernel, "
1301                                     "please fix it in %s:%u", filename, lineno);
1302                         else if (strstr(attr, "../") != NULL)
1303                                 log_error("do not reference parent sysfs directories directly, "
1304                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1305                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1306                         continue;
1307                 }
1308
1309                 if (strcmp(key, "TAGS") == 0) {
1310                         if (op > OP_MATCH_MAX) {
1311                                 log_error("invalid TAGS operation\n");
1312                                 goto invalid;
1313                         }
1314                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1315                         continue;
1316                 }
1317
1318                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1319                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1320                         if (attr == NULL) {
1321                                 log_error("error parsing ENV attribute\n");
1322                                 goto invalid;
1323                         }
1324                         if (op < OP_MATCH_MAX) {
1325                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1326                                         goto invalid;
1327                         } else {
1328                                 static const char *blacklist[] = {
1329                                         "ACTION",
1330                                         "SUBSYSTEM",
1331                                         "DEVTYPE",
1332                                         "MAJOR",
1333                                         "MINOR",
1334                                         "DRIVER",
1335                                         "IFINDEX",
1336                                         "DEVNAME",
1337                                         "DEVLINKS",
1338                                         "DEVPATH",
1339                                         "TAGS",
1340                                 };
1341                                 unsigned int i;
1342
1343                                 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1344                                         if (strcmp(attr, blacklist[i]) == 0) {
1345                                                 log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1346                                                 continue;
1347                                         }
1348                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1349                                         goto invalid;
1350                         }
1351                         continue;
1352                 }
1353
1354                 if (strcmp(key, "TAG") == 0) {
1355                         if (op < OP_MATCH_MAX)
1356                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1357                         else
1358                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1359                         continue;
1360                 }
1361
1362                 if (strcmp(key, "PROGRAM") == 0) {
1363                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1364                         continue;
1365                 }
1366
1367                 if (strcmp(key, "RESULT") == 0) {
1368                         if (op > OP_MATCH_MAX) {
1369                                 log_error("invalid RESULT operation\n");
1370                                 goto invalid;
1371                         }
1372                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1373                         continue;
1374                 }
1375
1376                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1377                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1378                         if (attr == NULL) {
1379                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1380                                 continue;
1381                         }
1382                         if (strstr(attr, "program")) {
1383                                 /* find known built-in command */
1384                                 if (value[0] != '/') {
1385                                         enum udev_builtin_cmd cmd;
1386
1387                                         cmd = udev_builtin_lookup(value);
1388                                         if (cmd < UDEV_BUILTIN_MAX) {
1389                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1390                                                           value, filename, lineno);
1391                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1392                                                 continue;
1393                                         }
1394                                 }
1395                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1396                         } else if (strstr(attr, "builtin")) {
1397                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1398
1399                                 if (cmd < UDEV_BUILTIN_MAX)
1400                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1401                                 else
1402                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1403                         } else if (strstr(attr, "file")) {
1404                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1405                         } else if (strstr(attr, "db")) {
1406                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1407                         } else if (strstr(attr, "cmdline")) {
1408                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1409                         } else if (strstr(attr, "parent")) {
1410                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1411                         }
1412                         continue;
1413                 }
1414
1415                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1416                         mode_t mode = 0;
1417
1418                         if (op > OP_MATCH_MAX) {
1419                                 log_error("invalid TEST operation\n");
1420                                 goto invalid;
1421                         }
1422                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1423                         if (attr != NULL) {
1424                                 mode = strtol(attr, NULL, 8);
1425                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1426                         } else {
1427                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1428                         }
1429                         continue;
1430                 }
1431
1432                 if (strcmp(key, "RUN") == 0) {
1433                         if (strncmp(value, "socket:", 7) == 0)
1434                                 log_error("RUN+=\"socket:...\" support will be removed from a future udev release. "
1435                                     "Please remove it from: %s:%u and use libudev to subscribe to events.\n", filename, lineno);
1436                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, NULL);
1437                         continue;
1438                 }
1439
1440                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1441                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1442                         continue;
1443                 }
1444
1445                 if (strcmp(key, "LABEL") == 0) {
1446                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1447                         continue;
1448                 }
1449
1450                 if (strcmp(key, "GOTO") == 0) {
1451                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1452                         continue;
1453                 }
1454
1455                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1456                         if (op < OP_MATCH_MAX) {
1457                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1458                         } else {
1459                                 if (strcmp(value, "%k") == 0) {
1460                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1461                                             "please remove it from %s:%u\n", filename, lineno);
1462                                         continue;
1463                                 }
1464                                 if (value[0] == '\0') {
1465                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1466                                                   "please remove it from %s:%u\n", filename, lineno);
1467                                         continue;
1468                                 }
1469                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1470                         }
1471                         rule_tmp.rule.rule.can_set_name = true;
1472                         continue;
1473                 }
1474
1475                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1476                         if (op < OP_MATCH_MAX) {
1477                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1478                         } else {
1479                                 int flag = 0;
1480
1481                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1482                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1483                                         flag = 1;
1484                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1485                         }
1486                         rule_tmp.rule.rule.can_set_name = true;
1487                         continue;
1488                 }
1489
1490                 if (strcmp(key, "OWNER") == 0) {
1491                         uid_t uid;
1492                         char *endptr;
1493
1494                         uid = strtoul(value, &endptr, 10);
1495                         if (endptr[0] == '\0') {
1496                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1497                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1498                                 uid = add_uid(rules, value);
1499                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1500                         } else if (rules->resolve_names >= 0) {
1501                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1502                         }
1503                         rule_tmp.rule.rule.can_set_name = true;
1504                         continue;
1505                 }
1506
1507                 if (strcmp(key, "GROUP") == 0) {
1508                         gid_t gid;
1509                         char *endptr;
1510
1511                         gid = strtoul(value, &endptr, 10);
1512                         if (endptr[0] == '\0') {
1513                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1514                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1515                                 gid = add_gid(rules, value);
1516                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1517                         } else if (rules->resolve_names >= 0) {
1518                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1519                         }
1520                         rule_tmp.rule.rule.can_set_name = true;
1521                         continue;
1522                 }
1523
1524                 if (strcmp(key, "MODE") == 0) {
1525                         mode_t mode;
1526                         char *endptr;
1527
1528                         mode = strtol(value, &endptr, 8);
1529                         if (endptr[0] == '\0')
1530                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1531                         else
1532                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1533                         rule_tmp.rule.rule.can_set_name = true;
1534                         continue;
1535                 }
1536
1537                 if (strcmp(key, "OPTIONS") == 0) {
1538                         const char *pos;
1539
1540                         pos = strstr(value, "link_priority=");
1541                         if (pos != NULL) {
1542                                 int prio = atoi(&pos[strlen("link_priority=")]);
1543
1544                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1545                         }
1546
1547                         pos = strstr(value, "event_timeout=");
1548                         if (pos != NULL) {
1549                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1550
1551                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1552                         }
1553
1554                         pos = strstr(value, "string_escape=");
1555                         if (pos != NULL) {
1556                                 pos = &pos[strlen("string_escape=")];
1557                                 if (strncmp(pos, "none", strlen("none")) == 0)
1558                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1559                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1560                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1561                         }
1562
1563                         pos = strstr(value, "db_persist");
1564                         if (pos != NULL)
1565                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1566
1567                         pos = strstr(value, "nowatch");
1568                         if (pos != NULL) {
1569                                 const int off = 0;
1570
1571                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1572                         } else {
1573                                 pos = strstr(value, "watch");
1574                                 if (pos != NULL) {
1575                                         const int on = 1;
1576
1577                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1578                                 }
1579                         }
1580
1581                         pos = strstr(value, "static_node=");
1582                         if (pos != NULL) {
1583                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1584                                 rule_tmp.rule.rule.has_static_node = true;
1585                         }
1586
1587                         continue;
1588                 }
1589
1590                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1591                 goto invalid;
1592         }
1593
1594         /* add rule token */
1595         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1596         if (add_token(rules, &rule_tmp.rule) != 0)
1597                 goto invalid;
1598
1599         /* add tokens to list, sorted by type */
1600         if (sort_token(rules, &rule_tmp) != 0)
1601                 goto invalid;
1602
1603         return 0;
1604 invalid:
1605         log_error("invalid rule '%s:%u'\n", filename, lineno);
1606         return -1;
1607 }
1608
1609 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1610 {
1611         FILE *f;
1612         unsigned int first_token;
1613         char line[UTIL_LINE_SIZE];
1614         int line_nr = 0;
1615         unsigned int i;
1616
1617         log_debug("reading '%s' as rules file\n", filename);
1618
1619         f = fopen(filename, "r");
1620         if (f == NULL)
1621                 return -1;
1622
1623         first_token = rules->token_cur;
1624
1625         while (fgets(line, sizeof(line), f) != NULL) {
1626                 char *key;
1627                 size_t len;
1628
1629                 /* skip whitespace */
1630                 line_nr++;
1631                 key = line;
1632                 while (isspace(key[0]))
1633                         key++;
1634
1635                 /* comment */
1636                 if (key[0] == '#')
1637                         continue;
1638
1639                 len = strlen(line);
1640                 if (len < 3)
1641                         continue;
1642
1643                 /* continue reading if backslash+newline is found */
1644                 while (line[len-2] == '\\') {
1645                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1646                                 break;
1647                         if (strlen(&line[len-2]) < 2)
1648                                 break;
1649                         line_nr++;
1650                         len = strlen(line);
1651                 }
1652
1653                 if (len+1 >= sizeof(line)) {
1654                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1655                         continue;
1656                 }
1657                 add_rule(rules, key, filename, filename_off, line_nr);
1658         }
1659         fclose(f);
1660
1661         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1662         for (i = first_token+1; i < rules->token_cur; i++) {
1663                 if (rules->tokens[i].type == TK_A_GOTO) {
1664                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1665                         unsigned int j;
1666
1667                         for (j = i+1; j < rules->token_cur; j++) {
1668                                 if (rules->tokens[j].type != TK_RULE)
1669                                         continue;
1670                                 if (rules->tokens[j].rule.label_off == 0)
1671                                         continue;
1672                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1673                                         continue;
1674                                 rules->tokens[i].key.rule_goto = j;
1675                                 break;
1676                         }
1677                         if (rules->tokens[i].key.rule_goto == 0)
1678                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1679                 }
1680         }
1681         return 0;
1682 }
1683
1684 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1685 {
1686         DIR *dir;
1687         struct dirent *dent;
1688         char filename[UTIL_PATH_SIZE];
1689
1690         dir = opendir(dirname);
1691         if (dir == NULL) {
1692                 log_debug("unable to open '%s': %m\n", dirname);
1693                 return -1;
1694         }
1695
1696         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1697                 if (dent->d_name[0] == '.')
1698                         continue;
1699
1700                 /* look for file matching with specified suffix */
1701                 if (suffix != NULL) {
1702                         const char *ext;
1703
1704                         ext = strrchr(dent->d_name, '.');
1705                         if (ext == NULL)
1706                                 continue;
1707                         if (strcmp(ext, suffix) != 0)
1708                                 continue;
1709                 }
1710                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1711                 /*
1712                  * the basename is the key, the filename the value
1713                  * identical basenames from different directories override each other
1714                  * entries are sorted after basename
1715                  */
1716                 udev_list_entry_add(file_list, dent->d_name, filename);
1717         }
1718
1719         closedir(dir);
1720         return 0;
1721 }
1722
1723 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1724 {
1725         struct udev_rules *rules;
1726         struct udev_list file_list;
1727         struct udev_list_entry *file_loop;
1728         struct token end_token;
1729         char **s;
1730
1731         rules = calloc(1, sizeof(struct udev_rules));
1732         if (rules == NULL)
1733                 return NULL;
1734         rules->udev = udev;
1735         rules->resolve_names = resolve_names;
1736         udev_list_init(udev, &file_list, true);
1737
1738         /* init token array and string buffer */
1739         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1740         if (rules->tokens == NULL) {
1741                 free(rules);
1742                 return NULL;
1743         }
1744         rules->token_max = PREALLOC_TOKEN;
1745
1746         rules->buf = malloc(PREALLOC_STRBUF);
1747         if (rules->buf == NULL) {
1748                 free(rules->tokens);
1749                 free(rules);
1750                 return NULL;
1751         }
1752         rules->buf_max = PREALLOC_STRBUF;
1753         /* offset 0 is always '\0' */
1754         rules->buf[0] = '\0';
1755         rules->buf_cur = 1;
1756
1757         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1758         if (rules->trie_nodes == NULL) {
1759                 free(rules->buf);
1760                 free(rules->tokens);
1761                 free(rules);
1762                 return NULL;
1763         }
1764         rules->trie_nodes_max = PREALLOC_TRIE;
1765         /* offset 0 is the trie root, with an empty string */
1766         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1767         rules->trie_nodes_cur = 1;
1768
1769         for (udev_get_rules_path(udev, &s, NULL); *s != NULL; s++)
1770                 add_matching_files(udev, &file_list, *s, ".rules");
1771
1772         /* add all filenames to the string buffer */
1773         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1774                 const char *filename = udev_list_entry_get_value(file_loop);
1775                 unsigned int filename_off;
1776
1777                 filename_off = add_string(rules, filename);
1778                 /* the offset in the rule is limited to unsigned short */
1779                 if (filename_off < USHRT_MAX)
1780                         udev_list_entry_set_num(file_loop, filename_off);
1781         }
1782
1783         /* parse all rules files */
1784         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1785                 const char *filename = udev_list_entry_get_value(file_loop);
1786                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1787                 struct stat st;
1788
1789                 if (stat(filename, &st) != 0) {
1790                         log_error("can not find '%s': %m\n", filename);
1791                         continue;
1792                 }
1793                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1794                         log_debug("ignore empty '%s'\n", filename);
1795                         continue;
1796                 }
1797                 if (S_ISCHR(st.st_mode)) {
1798                         log_debug("ignore masked '%s'\n", filename);
1799                         continue;
1800                 }
1801                 parse_file(rules, filename, filename_off);
1802         }
1803         udev_list_cleanup(&file_list);
1804
1805         memset(&end_token, 0x00, sizeof(struct token));
1806         end_token.type = TK_END;
1807         add_token(rules, &end_token);
1808
1809         /* shrink allocated token and string buffer */
1810         if (rules->token_cur < rules->token_max) {
1811                 struct token *tokens;
1812
1813                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1814                 if (tokens != NULL || rules->token_cur == 0) {
1815                         rules->tokens = tokens;
1816                         rules->token_max = rules->token_cur;
1817                 }
1818         }
1819         if (rules->buf_cur < rules->buf_max) {
1820                 char *buf;
1821
1822                 buf = realloc(rules->buf, rules->buf_cur);
1823                 if (buf != NULL || rules->buf_cur == 0) {
1824                         rules->buf = buf;
1825                         rules->buf_max = rules->buf_cur;
1826                 }
1827         }
1828         log_debug("rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1829                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1830         log_debug("temporary index used %zu bytes (%u * %zu bytes)\n",
1831                   rules->trie_nodes_cur * sizeof(struct trie_node),
1832                   rules->trie_nodes_cur, sizeof(struct trie_node));
1833
1834         /* cleanup trie */
1835         free(rules->trie_nodes);
1836         rules->trie_nodes = NULL;
1837         rules->trie_nodes_cur = 0;
1838         rules->trie_nodes_max = 0;
1839
1840         /* cleanup uid/gid cache */
1841         free(rules->uids);
1842         rules->uids = NULL;
1843         rules->uids_cur = 0;
1844         rules->uids_max = 0;
1845         free(rules->gids);
1846         rules->gids = NULL;
1847         rules->gids_cur = 0;
1848         rules->gids_max = 0;
1849
1850         dump_rules(rules);
1851         return rules;
1852 }
1853
1854 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1855 {
1856         if (rules == NULL)
1857                 return NULL;
1858         free(rules->tokens);
1859         free(rules->buf);
1860         free(rules->trie_nodes);
1861         free(rules->uids);
1862         free(rules->gids);
1863         free(rules);
1864         return NULL;
1865 }
1866
1867 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1868 {
1869         char *key_value = &rules->buf[token->key.value_off];
1870         char *pos;
1871         bool match = false;
1872
1873         if (val == NULL)
1874                 val = "";
1875
1876         switch (token->key.glob) {
1877         case GL_PLAIN:
1878                 match = (strcmp(key_value, val) == 0);
1879                 break;
1880         case GL_GLOB:
1881                 match = (fnmatch(key_value, val, 0) == 0);
1882                 break;
1883         case GL_SPLIT:
1884                 {
1885                         const char *split;
1886                         size_t len;
1887
1888                         split = &rules->buf[token->key.value_off];
1889                         len = strlen(val);
1890                         for (;;) {
1891                                 const char *next;
1892
1893                                 next = strchr(split, '|');
1894                                 if (next != NULL) {
1895                                         size_t matchlen = (size_t)(next - split);
1896
1897                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1898                                         if (match)
1899                                                 break;
1900                                 } else {
1901                                         match = (strcmp(split, val) == 0);
1902                                         break;
1903                                 }
1904                                 split = &next[1];
1905                         }
1906                         break;
1907                 }
1908         case GL_SPLIT_GLOB:
1909                 {
1910                         char value[UTIL_PATH_SIZE];
1911
1912                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1913                         key_value = value;
1914                         while (key_value != NULL) {
1915                                 pos = strchr(key_value, '|');
1916                                 if (pos != NULL) {
1917                                         pos[0] = '\0';
1918                                         pos = &pos[1];
1919                                 }
1920                                 match = (fnmatch(key_value, val, 0) == 0);
1921                                 if (match)
1922                                         break;
1923                                 key_value = pos;
1924                         }
1925                         break;
1926                 }
1927         case GL_SOMETHING:
1928                 match = (val[0] != '\0');
1929                 break;
1930         case GL_UNSET:
1931                 return -1;
1932         }
1933
1934         if (match && (token->key.op == OP_MATCH))
1935                 return 0;
1936         if (!match && (token->key.op == OP_NOMATCH))
1937                 return 0;
1938         return -1;
1939 }
1940
1941 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1942 {
1943         const char *name;
1944         char nbuf[UTIL_NAME_SIZE];
1945         const char *value;
1946         char vbuf[UTIL_NAME_SIZE];
1947         size_t len;
1948
1949         name = &rules->buf[cur->key.attr_off];
1950         switch (cur->key.attrsubst) {
1951         case SB_FORMAT:
1952                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1953                 name = nbuf;
1954                 /* fall through */
1955         case SB_NONE:
1956                 value = udev_device_get_sysattr_value(dev, name);
1957                 if (value == NULL)
1958                         return -1;
1959                 break;
1960         case SB_SUBSYS:
1961                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1962                         return -1;
1963                 value = vbuf;
1964                 break;
1965         default:
1966                 return -1;
1967         }
1968
1969         /* remove trailing whitespace, if not asked to match for it */
1970         len = strlen(value);
1971         if (len > 0 && isspace(value[len-1])) {
1972                 const char *key_value;
1973                 size_t klen;
1974
1975                 key_value = &rules->buf[cur->key.value_off];
1976                 klen = strlen(key_value);
1977                 if (klen > 0 && !isspace(key_value[klen-1])) {
1978                         if (value != vbuf) {
1979                                 util_strscpy(vbuf, sizeof(vbuf), value);
1980                                 value = vbuf;
1981                         }
1982                         while (len > 0 && isspace(vbuf[--len]))
1983                                 vbuf[len] = '\0';
1984                 }
1985         }
1986
1987         return match_key(rules, cur, value);
1988 }
1989
1990 enum escape_type {
1991         ESCAPE_UNSET,
1992         ESCAPE_NONE,
1993         ESCAPE_REPLACE,
1994 };
1995
1996 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
1997 {
1998         struct token *cur;
1999         struct token *rule;
2000         enum escape_type esc = ESCAPE_UNSET;
2001         bool can_set_name;
2002
2003         if (rules->tokens == NULL)
2004                 return -1;
2005
2006         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2007                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2008                          udev_device_get_ifindex(event->dev) > 0));
2009
2010         /* loop through token list, match, run actions or forward to next rule */
2011         cur = &rules->tokens[0];
2012         rule = cur;
2013         for (;;) {
2014                 dump_token(rules, cur);
2015                 switch (cur->type) {
2016                 case TK_RULE:
2017                         /* current rule */
2018                         rule = cur;
2019                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2020                         if (!can_set_name && rule->rule.can_set_name)
2021                                 goto nomatch;
2022                         esc = ESCAPE_UNSET;
2023                         break;
2024                 case TK_M_ACTION:
2025                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2026                                 goto nomatch;
2027                         break;
2028                 case TK_M_DEVPATH:
2029                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2030                                 goto nomatch;
2031                         break;
2032                 case TK_M_KERNEL:
2033                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2034                                 goto nomatch;
2035                         break;
2036                 case TK_M_DEVLINK: {
2037                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2038                         struct udev_list_entry *list_entry;
2039                         bool match = false;
2040
2041                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2042                                 const char *devlink;
2043
2044                                 devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2045                                 if (match_key(rules, cur, devlink) == 0) {
2046                                         match = true;
2047                                         break;
2048                                 }
2049                         }
2050                         if (!match)
2051                                 goto nomatch;
2052                         break;
2053                 }
2054                 case TK_M_NAME:
2055                         if (match_key(rules, cur, event->name) != 0)
2056                                 goto nomatch;
2057                         break;
2058                 case TK_M_ENV: {
2059                         const char *key_name = &rules->buf[cur->key.attr_off];
2060                         const char *value;
2061
2062                         value = udev_device_get_property_value(event->dev, key_name);
2063                         if (value == NULL)
2064                                 value = "";
2065                         if (match_key(rules, cur, value))
2066                                 goto nomatch;
2067                         break;
2068                 }
2069                 case TK_M_TAG: {
2070                         struct udev_list_entry *list_entry;
2071                         bool match = false;
2072
2073                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2074                                 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2075                                         match = true;
2076                                         break;
2077                                 }
2078                         }
2079                         if (!match && (cur->key.op != OP_NOMATCH))
2080                                 goto nomatch;
2081                         break;
2082                 }
2083                 case TK_M_SUBSYSTEM:
2084                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2085                                 goto nomatch;
2086                         break;
2087                 case TK_M_DRIVER:
2088                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2089                                 goto nomatch;
2090                         break;
2091                 case TK_M_WAITFOR: {
2092                         char filename[UTIL_PATH_SIZE];
2093                         int found;
2094
2095                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2096                         found = (wait_for_file(event->dev, filename, 10) == 0);
2097                         if (!found && (cur->key.op != OP_NOMATCH))
2098                                 goto nomatch;
2099                         break;
2100                 }
2101                 case TK_M_ATTR:
2102                         if (match_attr(rules, event->dev, event, cur) != 0)
2103                                 goto nomatch;
2104                         break;
2105                 case TK_M_KERNELS:
2106                 case TK_M_SUBSYSTEMS:
2107                 case TK_M_DRIVERS:
2108                 case TK_M_ATTRS:
2109                 case TK_M_TAGS: {
2110                         struct token *next;
2111
2112                         /* get whole sequence of parent matches */
2113                         next = cur;
2114                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2115                                 next++;
2116
2117                         /* loop over parents */
2118                         event->dev_parent = event->dev;
2119                         for (;;) {
2120                                 struct token *key;
2121
2122                                 /* loop over sequence of parent match keys */
2123                                 for (key = cur; key < next; key++ ) {
2124                                         dump_token(rules, key);
2125                                         switch(key->type) {
2126                                         case TK_M_KERNELS:
2127                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2128                                                         goto try_parent;
2129                                                 break;
2130                                         case TK_M_SUBSYSTEMS:
2131                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2132                                                         goto try_parent;
2133                                                 break;
2134                                         case TK_M_DRIVERS:
2135                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2136                                                         goto try_parent;
2137                                                 break;
2138                                         case TK_M_ATTRS:
2139                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2140                                                         goto try_parent;
2141                                                 break;
2142                                         case TK_M_TAGS: {
2143                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2144
2145                                                 if (match && key->key.op == OP_NOMATCH)
2146                                                         goto try_parent;
2147                                                 if (!match && key->key.op == OP_MATCH)
2148                                                         goto try_parent;
2149                                                 break;
2150                                         }
2151                                         default:
2152                                                 goto nomatch;
2153                                         }
2154                                 }
2155                                 break;
2156
2157                         try_parent:
2158                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2159                                 if (event->dev_parent == NULL)
2160                                         goto nomatch;
2161                         }
2162                         /* move behind our sequence of parent match keys */
2163                         cur = next;
2164                         continue;
2165                 }
2166                 case TK_M_TEST: {
2167                         char filename[UTIL_PATH_SIZE];
2168                         struct stat statbuf;
2169                         int match;
2170
2171                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2172                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2173                                 if (filename[0] != '/') {
2174                                         char tmp[UTIL_PATH_SIZE];
2175
2176                                         util_strscpy(tmp, sizeof(tmp), filename);
2177                                         util_strscpyl(filename, sizeof(filename),
2178                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2179                                 }
2180                         }
2181                         attr_subst_subdir(filename, sizeof(filename));
2182
2183                         match = (stat(filename, &statbuf) == 0);
2184                         if (match && cur->key.mode > 0)
2185                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2186                         if (match && cur->key.op == OP_NOMATCH)
2187                                 goto nomatch;
2188                         if (!match && cur->key.op == OP_MATCH)
2189                                 goto nomatch;
2190                         break;
2191                 }
2192                 case TK_M_EVENT_TIMEOUT:
2193                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2194                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2195                         break;
2196                 case TK_M_PROGRAM: {
2197                         char program[UTIL_PATH_SIZE];
2198                         char **envp;
2199                         char result[UTIL_PATH_SIZE];
2200
2201                         free(event->program_result);
2202                         event->program_result = NULL;
2203                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2204                         envp = udev_device_get_properties_envp(event->dev);
2205                         log_debug("PROGRAM '%s' %s:%u\n",
2206                                   program,
2207                                   &rules->buf[rule->rule.filename_off],
2208                                   rule->rule.filename_line);
2209
2210                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2211                                 if (cur->key.op != OP_NOMATCH)
2212                                         goto nomatch;
2213                         } else {
2214                                 int count;
2215
2216                                 util_remove_trailing_chars(result, '\n');
2217                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2218                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2219                                         if (count > 0)
2220                                                 log_debug("%i character(s) replaced\n" , count);
2221                                 }
2222                                 event->program_result = strdup(result);
2223                                 if (cur->key.op == OP_NOMATCH)
2224                                         goto nomatch;
2225                         }
2226                         break;
2227                 }
2228                 case TK_M_IMPORT_FILE: {
2229                         char import[UTIL_PATH_SIZE];
2230
2231                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2232                         if (import_file_into_properties(event->dev, import) != 0)
2233                                 if (cur->key.op != OP_NOMATCH)
2234                                         goto nomatch;
2235                         break;
2236                 }
2237                 case TK_M_IMPORT_PROG: {
2238                         char import[UTIL_PATH_SIZE];
2239
2240                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2241                         log_debug("IMPORT '%s' %s:%u\n",
2242                                   import,
2243                                   &rules->buf[rule->rule.filename_off],
2244                                   rule->rule.filename_line);
2245
2246                         if (import_program_into_properties(event, import, sigmask) != 0)
2247                                 if (cur->key.op != OP_NOMATCH)
2248                                         goto nomatch;
2249                         break;
2250                 }
2251                 case TK_M_IMPORT_BUILTIN: {
2252                         char command[UTIL_PATH_SIZE];
2253
2254                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2255                                 /* check if we ran already */
2256                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2257                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2258                                                   udev_builtin_name(cur->key.builtin_cmd),
2259                                                   &rules->buf[rule->rule.filename_off],
2260                                                   rule->rule.filename_line);
2261                                         /* return the result from earlier run */
2262                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2263                                         if (cur->key.op != OP_NOMATCH)
2264                                                         goto nomatch;
2265                                         break;
2266                                 }
2267                                 /* mark as ran */
2268                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2269                         }
2270
2271                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], command, sizeof(command));
2272                         log_debug("IMPORT builtin '%s' %s:%u\n",
2273                                   udev_builtin_name(cur->key.builtin_cmd),
2274                                   &rules->buf[rule->rule.filename_off],
2275                                   rule->rule.filename_line);
2276
2277                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2278                                 /* remember failure */
2279                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2280                                           udev_builtin_name(cur->key.builtin_cmd));
2281                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2282                                 if (cur->key.op != OP_NOMATCH)
2283                                         goto nomatch;
2284                         }
2285                         break;
2286                 }
2287                 case TK_M_IMPORT_DB: {
2288                         const char *key = &rules->buf[cur->key.value_off];
2289                         const char *value;
2290
2291                         value = udev_device_get_property_value(event->dev_db, key);
2292                         if (value != NULL) {
2293                                 struct udev_list_entry *entry;
2294
2295                                 entry = udev_device_add_property(event->dev, key, value);
2296                                 udev_list_entry_set_num(entry, true);
2297                         } else {
2298                                 if (cur->key.op != OP_NOMATCH)
2299                                         goto nomatch;
2300                         }
2301                         break;
2302                 }
2303                 case TK_M_IMPORT_CMDLINE: {
2304                         FILE *f;
2305                         bool imported = false;
2306
2307                         f = fopen("/proc/cmdline", "r");
2308                         if (f != NULL) {
2309                                 char cmdline[4096];
2310
2311                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2312                                         const char *key = &rules->buf[cur->key.value_off];
2313                                         char *pos;
2314
2315                                         pos = strstr(cmdline, key);
2316                                         if (pos != NULL) {
2317                                                 struct udev_list_entry *entry;
2318
2319                                                 pos += strlen(key);
2320                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2321                                                         /* we import simple flags as 'FLAG=1' */
2322                                                         entry = udev_device_add_property(event->dev, key, "1");
2323                                                         udev_list_entry_set_num(entry, true);
2324                                                         imported = true;
2325                                                 } else if (pos[0] == '=') {
2326                                                         const char *value;
2327
2328                                                         pos++;
2329                                                         value = pos;
2330                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2331                                                                 pos++;
2332                                                         pos[0] = '\0';
2333                                                         entry = udev_device_add_property(event->dev, key, value);
2334                                                         udev_list_entry_set_num(entry, true);
2335                                                         imported = true;
2336                                                 }
2337                                         }
2338                                 }
2339                                 fclose(f);
2340                         }
2341                         if (!imported && cur->key.op != OP_NOMATCH)
2342                                 goto nomatch;
2343                         break;
2344                 }
2345                 case TK_M_IMPORT_PARENT: {
2346                         char import[UTIL_PATH_SIZE];
2347
2348                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2349                         if (import_parent_into_properties(event->dev, import) != 0)
2350                                 if (cur->key.op != OP_NOMATCH)
2351                                         goto nomatch;
2352                         break;
2353                 }
2354                 case TK_M_RESULT:
2355                         if (match_key(rules, cur, event->program_result) != 0)
2356                                 goto nomatch;
2357                         break;
2358                 case TK_A_STRING_ESCAPE_NONE:
2359                         esc = ESCAPE_NONE;
2360                         break;
2361                 case TK_A_STRING_ESCAPE_REPLACE:
2362                         esc = ESCAPE_REPLACE;
2363                         break;
2364                 case TK_A_DB_PERSIST:
2365                         udev_device_set_db_persist(event->dev);
2366                         break;
2367                 case TK_A_INOTIFY_WATCH:
2368                         if (event->inotify_watch_final)
2369                                 break;
2370                         if (cur->key.op == OP_ASSIGN_FINAL)
2371                                 event->inotify_watch_final = true;
2372                         event->inotify_watch = cur->key.watch;
2373                         break;
2374                 case TK_A_DEVLINK_PRIO:
2375                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2376                         break;
2377                 case TK_A_OWNER: {
2378                         char owner[UTIL_NAME_SIZE];
2379
2380                         if (event->owner_final)
2381                                 break;
2382                         if (cur->key.op == OP_ASSIGN_FINAL)
2383                                 event->owner_final = true;
2384                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2385                         event->uid = util_lookup_user(event->udev, owner);
2386                         log_debug("OWNER %u %s:%u\n",
2387                                   event->uid,
2388                                   &rules->buf[rule->rule.filename_off],
2389                                   rule->rule.filename_line);
2390                         break;
2391                 }
2392                 case TK_A_GROUP: {
2393                         char group[UTIL_NAME_SIZE];
2394
2395                         if (event->group_final)
2396                                 break;
2397                         if (cur->key.op == OP_ASSIGN_FINAL)
2398                                 event->group_final = true;
2399                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2400                         event->gid = util_lookup_group(event->udev, group);
2401                         log_debug("GROUP %u %s:%u\n",
2402                                   event->gid,
2403                                   &rules->buf[rule->rule.filename_off],
2404                                   rule->rule.filename_line);
2405                         break;
2406                 }
2407                 case TK_A_MODE: {
2408                         char mode_str[UTIL_NAME_SIZE];
2409                         mode_t mode;
2410                         char *endptr;
2411
2412                         if (event->mode_final)
2413                                 break;
2414                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2415                         mode = strtol(mode_str, &endptr, 8);
2416                         if (endptr[0] != '\0') {
2417                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2418                                 break;
2419                         }
2420                         if (cur->key.op == OP_ASSIGN_FINAL)
2421                                 event->mode_final = true;
2422                         event->mode_set = true;
2423                         event->mode = mode;
2424                         log_debug("MODE %#o %s:%u\n",
2425                                   event->mode,
2426                                   &rules->buf[rule->rule.filename_off],
2427                                   rule->rule.filename_line);
2428                         break;
2429                 }
2430                 case TK_A_OWNER_ID:
2431                         if (event->owner_final)
2432                                 break;
2433                         if (cur->key.op == OP_ASSIGN_FINAL)
2434                                 event->owner_final = true;
2435                         event->uid = cur->key.uid;
2436                         log_debug("OWNER %u %s:%u\n",
2437                                   event->uid,
2438                                   &rules->buf[rule->rule.filename_off],
2439                                   rule->rule.filename_line);
2440                         break;
2441                 case TK_A_GROUP_ID:
2442                         if (event->group_final)
2443                                 break;
2444                         if (cur->key.op == OP_ASSIGN_FINAL)
2445                                 event->group_final = true;
2446                         event->gid = cur->key.gid;
2447                         log_debug("GROUP %u %s:%u\n",
2448                                   event->gid,
2449                                   &rules->buf[rule->rule.filename_off],
2450                                   rule->rule.filename_line);
2451                         break;
2452                 case TK_A_MODE_ID:
2453                         if (event->mode_final)
2454                                 break;
2455                         if (cur->key.op == OP_ASSIGN_FINAL)
2456                                 event->mode_final = true;
2457                         event->mode_set = true;
2458                         event->mode = cur->key.mode;
2459                         log_debug("MODE %#o %s:%u\n",
2460                                   event->mode,
2461                                   &rules->buf[rule->rule.filename_off],
2462                                   rule->rule.filename_line);
2463                         break;
2464                 case TK_A_ENV: {
2465                         const char *name = &rules->buf[cur->key.attr_off];
2466                         char *value = &rules->buf[cur->key.value_off];
2467
2468                         if (value[0] != '\0') {
2469                                 char temp_value[UTIL_NAME_SIZE];
2470                                 struct udev_list_entry *entry;
2471
2472                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2473                                 entry = udev_device_add_property(event->dev, name, temp_value);
2474                                 /* store in db, skip private keys */
2475                                 if (name[0] != '.')
2476                                         udev_list_entry_set_num(entry, true);
2477                         } else {
2478                                 udev_device_add_property(event->dev, name, NULL);
2479                         }
2480                         break;
2481                 }
2482                 case TK_A_TAG: {
2483                         char tag[UTIL_PATH_SIZE];
2484                         const char *p;
2485
2486                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2487                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2488                                 udev_device_cleanup_tags_list(event->dev);
2489                         for (p = tag; *p != '\0'; p++) {
2490                                 if ((*p >= 'a' && *p <= 'z') ||
2491                                     (*p >= 'A' && *p <= 'Z') ||
2492                                     (*p >= '0' && *p <= '9') ||
2493                                     *p == '-' || *p == '_')
2494                                         continue;
2495                                 log_error("ignoring invalid tag name '%s'\n", tag);
2496                                 break;
2497                         }
2498                         udev_device_add_tag(event->dev, tag);
2499                         break;
2500                 }
2501                 case TK_A_NAME: {
2502                         const char *name  = &rules->buf[cur->key.value_off];
2503
2504                         char name_str[UTIL_PATH_SIZE];
2505                         int count;
2506
2507                         if (event->name_final)
2508                                 break;
2509                         if (cur->key.op == OP_ASSIGN_FINAL)
2510                                 event->name_final = true;
2511                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2512                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2513                                 count = util_replace_chars(name_str, "/");
2514                                 if (count > 0)
2515                                         log_debug("%i character(s) replaced\n", count);
2516                         }
2517                         if (major(udev_device_get_devnum(event->dev))) {
2518                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2519
2520                                 if (strcmp(name_str, &udev_device_get_devnode(event->dev)[devlen]) != 0) {
2521                                         log_error("NAME=\"%s\" ignored, kernel device nodes "
2522                                             "can not be renamed; please fix it in %s:%u\n", name,
2523                                             &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2524                                         break;
2525                                 }
2526                         }
2527                         free(event->name);
2528                         event->name = strdup(name_str);
2529                         log_debug("NAME '%s' %s:%u\n",
2530                                   event->name,
2531                                   &rules->buf[rule->rule.filename_off],
2532                                   rule->rule.filename_line);
2533                         break;
2534                 }
2535                 case TK_A_DEVLINK: {
2536                         char temp[UTIL_PATH_SIZE];
2537                         char filename[UTIL_PATH_SIZE];
2538                         char *pos, *next;
2539                         int count = 0;
2540
2541                         if (event->devlink_final)
2542                                 break;
2543                         if (major(udev_device_get_devnum(event->dev)) == 0)
2544                                 break;
2545                         if (cur->key.op == OP_ASSIGN_FINAL)
2546                                 event->devlink_final = true;
2547                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2548                                 udev_device_cleanup_devlinks_list(event->dev);
2549
2550                         /* allow  multiple symlinks separated by spaces */
2551                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2552                         if (esc == ESCAPE_UNSET)
2553                                 count = util_replace_chars(temp, "/ ");
2554                         else if (esc == ESCAPE_REPLACE)
2555                                 count = util_replace_chars(temp, "/");
2556                         if (count > 0)
2557                                 log_debug("%i character(s) replaced\n" , count);
2558                         pos = temp;
2559                         while (isspace(pos[0]))
2560                                 pos++;
2561                         next = strchr(pos, ' ');
2562                         while (next != NULL) {
2563                                 next[0] = '\0';
2564                                 log_debug("LINK '%s' %s:%u\n", pos,
2565                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2566                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2567                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2568                                 while (isspace(next[1]))
2569                                         next++;
2570                                 pos = &next[1];
2571                                 next = strchr(pos, ' ');
2572                         }
2573                         if (pos[0] != '\0') {
2574                                 log_debug("LINK '%s' %s:%u\n", pos,
2575                                           &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2576                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2577                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2578                         }
2579                         break;
2580                 }
2581                 case TK_A_ATTR: {
2582                         const char *key_name = &rules->buf[cur->key.attr_off];
2583                         char attr[UTIL_PATH_SIZE];
2584                         char value[UTIL_NAME_SIZE];
2585                         FILE *f;
2586
2587                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2588                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2589                         attr_subst_subdir(attr, sizeof(attr));
2590
2591                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2592                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2593                                   &rules->buf[rule->rule.filename_off],
2594                                   rule->rule.filename_line);
2595                         f = fopen(attr, "w");
2596                         if (f != NULL) {
2597                                 if (fprintf(f, "%s", value) <= 0)
2598                                         log_error("error writing ATTR{%s}: %m\n", attr);
2599                                 fclose(f);
2600                         } else {
2601                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2602                         }
2603                         break;
2604                 }
2605                 case TK_A_RUN: {
2606                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2607                                 udev_list_cleanup(&event->run_list);
2608                         log_debug("RUN '%s' %s:%u\n",
2609                                   &rules->buf[cur->key.value_off],
2610                                   &rules->buf[rule->rule.filename_off],
2611                                   rule->rule.filename_line);
2612                         udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2613                         break;
2614                 }
2615                 case TK_A_GOTO:
2616                         if (cur->key.rule_goto == 0)
2617                                 break;
2618                         cur = &rules->tokens[cur->key.rule_goto];
2619                         continue;
2620                 case TK_END:
2621                         return 0;
2622
2623                 case TK_M_PARENTS_MIN:
2624                 case TK_M_PARENTS_MAX:
2625                 case TK_M_MAX:
2626                 case TK_UNSET:
2627                         log_error("wrong type %u\n", cur->type);
2628                         goto nomatch;
2629                 }
2630
2631                 cur++;
2632                 continue;
2633         nomatch:
2634                 /* fast-forward to next rule */
2635                 cur = rule + rule->rule.token_count;
2636         }
2637 }
2638
2639 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2640 {
2641         struct token *cur;
2642         struct token *rule;
2643         uid_t uid = 0;
2644         gid_t gid = 0;
2645         mode_t mode = 0;
2646
2647         if (rules->tokens == NULL)
2648                 return;
2649
2650         cur = &rules->tokens[0];
2651         rule = cur;
2652         for (;;) {
2653                 switch (cur->type) {
2654                 case TK_RULE:
2655                         /* current rule */
2656                         rule = cur;
2657
2658                         /* skip rules without a static_node tag */
2659                         if (!rule->rule.has_static_node)
2660                                 goto next;
2661
2662                         uid = 0;
2663                         gid = 0;
2664                         mode = 0;
2665                         break;
2666                 case TK_A_OWNER_ID:
2667                         uid = cur->key.uid;
2668                         break;
2669                 case TK_A_GROUP_ID:
2670                         gid = cur->key.gid;
2671                         break;
2672                 case TK_A_MODE_ID:
2673                         mode = cur->key.mode;
2674                         break;
2675                 case TK_A_STATIC_NODE: {
2676                         char filename[UTIL_PATH_SIZE];
2677                         struct stat stats;
2678
2679                         /* we assure, that the permissions tokens are sorted before the static token */
2680                         if (mode == 0 && uid == 0 && gid == 0)
2681                                 goto next;
2682                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2683                                       &rules->buf[cur->key.value_off], NULL);
2684                         if (stat(filename, &stats) != 0)
2685                                 goto next;
2686                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2687                                 goto next;
2688                         if (mode == 0) {
2689                                 if (gid > 0)
2690                                         mode = 0660;
2691                                 else
2692                                         mode = 0600;
2693                         }
2694                         if (mode != (stats.st_mode & 01777)) {
2695                                 chmod(filename, mode);
2696                                 log_debug("chmod '%s' %#o\n", filename, mode);
2697                         }
2698
2699                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2700                                 chown(filename, uid, gid);
2701                                 log_debug("chown '%s' %u %u\n", filename, uid, gid);
2702                         }
2703
2704                         utimensat(AT_FDCWD, filename, NULL, 0);
2705                         break;
2706                 }
2707                 case TK_END:
2708                         return;
2709                 }
2710
2711                 cur++;
2712                 continue;
2713 next:
2714                 /* fast-forward to next rule */
2715                 cur = rule + rule->rule.token_count;
2716                 continue;
2717         }
2718 }