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 ENABLE_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                         dbg(rules->udev, "* 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                 dbg(rules->udev, "%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                 dbg(rules->udev, "%s %i\n", token_str(type), token->key.builtin_cmd);
 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                 dbg(rules->udev, "%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                 dbg(rules->udev, "%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                 dbg(rules->udev, "%s\n", token_str(type));
 385                 break;
 386         case TK_M_TEST:
 387                 dbg(rules->udev, "%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                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 392                 break;
 393         case TK_A_DEVLINK_PRIO:
 394                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 395                 break;
 396         case TK_A_OWNER_ID:
 397                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 398                 break;
 399         case TK_A_GROUP_ID:
 400                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 401                 break;
 402         case TK_A_MODE_ID:
 403                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 404                 break;
 405         case TK_A_STATIC_NODE:
 406                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 407                 break;
 408         case TK_M_EVENT_TIMEOUT:
 409                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 410                 break;
 411         case TK_A_GOTO:
 412                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 413                 break;
 414         case TK_END:
 415                 dbg(rules->udev, "* %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                 dbg(rules->udev, "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         dbg(rules->udev, "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 /* ENABLE_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                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 463                 rules->buf = buf;
 464                 rules->buf_max += add;
 465         }
 466         off = rules->buf_cur;
 467         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 468         rules->buf_cur += bytes;
 469         rules->buf_count++;
 470         return off;
 471 }
 472
 473 static int add_string(struct udev_rules *rules, const char *str)
 474 {
 475         unsigned int node_idx;
 476         struct trie_node *new_node;
 477         unsigned int new_node_idx;
 478         unsigned char key;
 479         unsigned short len;
 480         unsigned int depth;
 481         unsigned int off;
 482         struct trie_node *parent;
 483
 484         /* walk trie, start from last character of str to find matching tails */
 485         len = strlen(str);
 486         key = str[len-1];
 487         node_idx = 0;
 488         for (depth = 0; depth <= len; depth++) {
 489                 struct trie_node *node;
 490                 unsigned int child_idx;
 491
 492                 node = &rules->trie_nodes[node_idx];
 493                 off = node->value_off + node->value_len - len;
 494
 495                 /* match against current node */
 496                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 497                         return off;
 498
 499                 /* lookup child node */
 500                 key = str[len - 1 - depth];
 501                 child_idx = node->child_idx;
 502                 while (child_idx > 0) {
 503                         struct trie_node *child;
 504
 505                         child = &rules->trie_nodes[child_idx];
 506                         if (child->key == key)
 507                                 break;
 508                         child_idx = child->next_child_idx;
 509                 }
 510                 if (child_idx == 0)
 511                         break;
 512                 node_idx = child_idx;
 513         }
 514
 515         /* string not found, add it */
 516         off = add_new_string(rules, str, len + 1);
 517
 518         /* grow trie nodes if needed */
 519         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 520                 struct trie_node *nodes;
 521                 unsigned int add;
 522
 523                 /* double the buffer size */
 524                 add = rules->trie_nodes_max;
 525                 if (add < 8)
 526                         add = 8;
 527
 528                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 529                 if (nodes == NULL)
 530                         return -1;
 531                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 532                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 533                 rules->trie_nodes = nodes;
 534                 rules->trie_nodes_max += add;
 535         }
 536
 537         /* get a new node */
 538         new_node_idx = rules->trie_nodes_cur;
 539         rules->trie_nodes_cur++;
 540         new_node = &rules->trie_nodes[new_node_idx];
 541         memset(new_node, 0x00, sizeof(struct trie_node));
 542         new_node->value_off = off;
 543         new_node->value_len = len;
 544         new_node->key = key;
 545
 546         /* join the parent's child list */
 547         parent = &rules->trie_nodes[node_idx];
 548         if (parent->child_idx == 0) {
 549                 parent->child_idx = new_node_idx;
 550         } else {
 551                 struct trie_node *last_child;
 552
 553                 last_child = &rules->trie_nodes[parent->last_child_idx];
 554                 last_child->next_child_idx = new_node_idx;
 555         }
 556         parent->last_child_idx = new_node_idx;
 557         return off;
 558 }
 559
 560 static int add_token(struct udev_rules *rules, struct token *token)
 561 {
 562         /* grow buffer if needed */
 563         if (rules->token_cur+1 >= rules->token_max) {
 564                 struct token *tokens;
 565                 unsigned int add;
 566
 567                 /* double the buffer size */
 568                 add = rules->token_max;
 569                 if (add < 8)
 570                         add = 8;
 571
 572                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 573                 if (tokens == NULL)
 574                         return -1;
 575                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 576                 rules->tokens = tokens;
 577                 rules->token_max += add;
 578         }
 579         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 580         rules->token_cur++;
 581         return 0;
 582 }
 583
 584 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 585 {
 586         unsigned int i;
 587         uid_t uid;
 588         unsigned int off;
 589
 590         /* lookup, if we know it already */
 591         for (i = 0; i < rules->uids_cur; i++) {
 592                 off = rules->uids[i].name_off;
 593                 if (strcmp(&rules->buf[off], owner) == 0) {
 594                         uid = rules->uids[i].uid;
 595                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 596                         return uid;
 597                 }
 598         }
 599         uid = util_lookup_user(rules->udev, owner);
 600
 601         /* grow buffer if needed */
 602         if (rules->uids_cur+1 >= rules->uids_max) {
 603                 struct uid_gid *uids;
 604                 unsigned int add;
 605
 606                 /* double the buffer size */
 607                 add = rules->uids_max;
 608                 if (add < 1)
 609                         add = 8;
 610
 611                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 612                 if (uids == NULL)
 613                         return uid;
 614                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 615                 rules->uids = uids;
 616                 rules->uids_max += add;
 617         }
 618         rules->uids[rules->uids_cur].uid = uid;
 619         off = add_string(rules, owner);
 620         if (off <= 0)
 621                 return uid;
 622         rules->uids[rules->uids_cur].name_off = off;
 623         rules->uids_cur++;
 624         return uid;
 625 }
 626
 627 static gid_t add_gid(struct udev_rules *rules, const char *group)
 628 {
 629         unsigned int i;
 630         gid_t gid;
 631         unsigned int off;
 632
 633         /* lookup, if we know it already */
 634         for (i = 0; i < rules->gids_cur; i++) {
 635                 off = rules->gids[i].name_off;
 636                 if (strcmp(&rules->buf[off], group) == 0) {
 637                         gid = rules->gids[i].gid;
 638                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 639                         return gid;
 640                 }
 641         }
 642         gid = util_lookup_group(rules->udev, group);
 643
 644         /* grow buffer if needed */
 645         if (rules->gids_cur+1 >= rules->gids_max) {
 646                 struct uid_gid *gids;
 647                 unsigned int add;
 648
 649                 /* double the buffer size */
 650                 add = rules->gids_max;
 651                 if (add < 1)
 652                         add = 8;
 653
 654                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 655                 if (gids == NULL)
 656                         return gid;
 657                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 658                 rules->gids = gids;
 659                 rules->gids_max += add;
 660         }
 661         rules->gids[rules->gids_cur].gid = gid;
 662         off = add_string(rules, group);
 663         if (off <= 0)
 664                 return gid;
 665         rules->gids[rules->gids_cur].name_off = off;
 666         rules->gids_cur++;
 667         return gid;
 668 }
 669
 670 static int import_property_from_string(struct udev_device *dev, char *line)
 671 {
 672         struct udev *udev = udev_device_get_udev(dev);
 673         char *key;
 674         char *val;
 675         size_t len;
 676
 677         /* find key */
 678         key = line;
 679         while (isspace(key[0]))
 680                 key++;
 681
 682         /* comment or empty line */
 683         if (key[0] == '#' || key[0] == '\0')
 684                 return -1;
 685
 686         /* split key/value */
 687         val = strchr(key, '=');
 688         if (val == NULL)
 689                 return -1;
 690         val[0] = '\0';
 691         val++;
 692
 693         /* find value */
 694         while (isspace(val[0]))
 695                 val++;
 696
 697         /* terminate key */
 698         len = strlen(key);
 699         if (len == 0)
 700                 return -1;
 701         while (isspace(key[len-1]))
 702                 len--;
 703         key[len] = '\0';
 704
 705         /* terminate value */
 706         len = strlen(val);
 707         if (len == 0)
 708                 return -1;
 709         while (isspace(val[len-1]))
 710                 len--;
 711         val[len] = '\0';
 712
 713         if (len == 0)
 714                 return -1;
 715
 716         /* unquote */
 717         if (val[0] == '"' || val[0] == '\'') {
 718                 if (val[len-1] != val[0]) {
 719                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 720                         return -1;
 721                 }
 722                 val[len-1] = '\0';
 723                 val++;
 724         }
 725
 726         dbg(udev, "adding '%s'='%s'\n", key, val);
 727
 728         /* handle device, renamed by external tool, returning new path */
 729         if (strcmp(key, "DEVPATH") == 0) {
 730                 char syspath[UTIL_PATH_SIZE];
 731
 732                 info(udev, "updating devpath from '%s' to '%s'\n",
 733                      udev_device_get_devpath(dev), val);
 734                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 735                 udev_device_set_syspath(dev, syspath);
 736         } else {
 737                 struct udev_list_entry *entry;
 738
 739                 entry = udev_device_add_property(dev, key, val);
 740                 /* store in db, skip private keys */
 741                 if (key[0] != '.')
 742                         udev_list_entry_set_num(entry, true);
 743         }
 744         return 0;
 745 }
 746
 747 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 748 {
 749         FILE *f;
 750         char line[UTIL_LINE_SIZE];
 751
 752         f = fopen(filename, "r");
 753         if (f == NULL)
 754                 return -1;
 755         while (fgets(line, sizeof(line), f) != NULL)
 756                 import_property_from_string(dev, line);
 757         fclose(f);
 758         return 0;
 759 }
 760
 761 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 762 {
 763         struct udev_device *dev = event->dev;
 764         char **envp;
 765         char result[UTIL_LINE_SIZE];
 766         char *line;
 767         int err;
 768
 769         envp = udev_device_get_properties_envp(dev);
 770         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 771         if (err < 0)
 772                 return err;
 773
 774         line = result;
 775         while (line != NULL) {
 776                 char *pos;
 777
 778                 pos = strchr(line, '\n');
 779                 if (pos != NULL) {
 780                         pos[0] = '\0';
 781                         pos = &pos[1];
 782                 }
 783                 import_property_from_string(dev, line);
 784                 line = pos;
 785         }
 786         return 0;
 787 }
 788
 789 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 790 {
 791         struct udev *udev = udev_device_get_udev(dev);
 792         struct udev_device *dev_parent;
 793         struct udev_list_entry *list_entry;
 794
 795         dev_parent = udev_device_get_parent(dev);
 796         if (dev_parent == NULL)
 797                 return -1;
 798
 799         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 800         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 801                 const char *key = udev_list_entry_get_name(list_entry);
 802                 const char *val = udev_list_entry_get_value(list_entry);
 803
 804                 if (fnmatch(filter, key, 0) == 0) {
 805                         struct udev_list_entry *entry;
 806
 807                         dbg(udev, "import key '%s=%s'\n", key, val);
 808                         entry = udev_device_add_property(dev, key, val);
 809                         /* store in db, skip private keys */
 810                         if (key[0] != '.')
 811                                 udev_list_entry_set_num(entry, true);
 812                 }
 813         }
 814         return 0;
 815 }
 816
 817 #define WAIT_LOOP_PER_SECOND            50
 818 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 819 {
 820         struct udev *udev = udev_device_get_udev(dev);
 821         char filepath[UTIL_PATH_SIZE];
 822         char devicepath[UTIL_PATH_SIZE];
 823         struct stat stats;
 824         int loop = timeout * WAIT_LOOP_PER_SECOND;
 825
 826         /* a relative path is a device attribute */
 827         devicepath[0] = '\0';
 828         if (file[0] != '/') {
 829                 util_strscpyl(devicepath, sizeof(devicepath),
 830                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 831                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 832                 file = filepath;
 833         }
 834
 835         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 836         while (--loop) {
 837                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 838
 839                 /* lookup file */
 840                 if (stat(file, &stats) == 0) {
 841                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 842                         return 0;
 843                 }
 844                 /* make sure, the device did not disappear in the meantime */
 845                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 846                         info(udev, "device disappeared while waiting for '%s'\n", file);
 847                         return -2;
 848                 }
 849                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 850                 nanosleep(&duration, NULL);
 851         }
 852         info(udev, "waiting for '%s' failed\n", file);
 853         return -1;
 854 }
 855
 856 static int attr_subst_subdir(char *attr, size_t len)
 857 {
 858         bool found = false;
 859
 860         if (strstr(attr, "/*/")) {
 861                 char *pos;
 862                 char dirname[UTIL_PATH_SIZE];
 863                 const char *tail;
 864                 DIR *dir;
 865
 866                 util_strscpy(dirname, sizeof(dirname), attr);
 867                 pos = strstr(dirname, "/*/");
 868                 if (pos == NULL)
 869                         return -1;
 870                 pos[0] = '\0';
 871                 tail = &pos[2];
 872                 dir = opendir(dirname);
 873                 if (dir != NULL) {
 874                         struct dirent *dent;
 875
 876                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 877                                 struct stat stats;
 878
 879                                 if (dent->d_name[0] == '.')
 880                                         continue;
 881                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 882                                 if (stat(attr, &stats) == 0) {
 883                                         found = true;
 884                                         break;
 885                                 }
 886                         }
 887                         closedir(dir);
 888                 }
 889         }
 890
 891         return found;
 892 }
 893
 894 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 895 {
 896         char *linepos;
 897         char *temp;
 898
 899         linepos = *line;
 900         if (linepos == NULL || linepos[0] == '\0')
 901                 return -1;
 902
 903         /* skip whitespace */
 904         while (isspace(linepos[0]) || linepos[0] == ',')
 905                 linepos++;
 906
 907         /* get the key */
 908         if (linepos[0] == '\0')
 909                 return -1;
 910         *key = linepos;
 911
 912         for (;;) {
 913                 linepos++;
 914                 if (linepos[0] == '\0')
 915                         return -1;
 916                 if (isspace(linepos[0]))
 917                         break;
 918                 if (linepos[0] == '=')
 919                         break;
 920                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 921                         if (linepos[1] == '=')
 922                                 break;
 923         }
 924
 925         /* remember end of key */
 926         temp = linepos;
 927
 928         /* skip whitespace after key */
 929         while (isspace(linepos[0]))
 930                 linepos++;
 931         if (linepos[0] == '\0')
 932                 return -1;
 933
 934         /* get operation type */
 935         if (linepos[0] == '=' && linepos[1] == '=') {
 936                 *op = OP_MATCH;
 937                 linepos += 2;
 938         } else if (linepos[0] == '!' && linepos[1] == '=') {
 939                 *op = OP_NOMATCH;
 940                 linepos += 2;
 941         } else if (linepos[0] == '+' && linepos[1] == '=') {
 942                 *op = OP_ADD;
 943                 linepos += 2;
 944         } else if (linepos[0] == '=') {
 945                 *op = OP_ASSIGN;
 946                 linepos++;
 947         } else if (linepos[0] == ':' && linepos[1] == '=') {
 948                 *op = OP_ASSIGN_FINAL;
 949                 linepos += 2;
 950         } else
 951                 return -1;
 952
 953         /* terminate key */
 954         temp[0] = '\0';
 955
 956         /* skip whitespace after operator */
 957         while (isspace(linepos[0]))
 958                 linepos++;
 959         if (linepos[0] == '\0')
 960                 return -1;
 961
 962         /* get the value */
 963         if (linepos[0] == '"')
 964                 linepos++;
 965         else
 966                 return -1;
 967         *value = linepos;
 968
 969         /* terminate */
 970         temp = strchr(linepos, '"');
 971         if (!temp)
 972                 return -1;
 973         temp[0] = '\0';
 974         temp++;
 975         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 976
 977         /* move line to next key */
 978         *line = temp;
 979         return 0;
 980 }
 981
 982 /* extract possible KEY{attr} */
 983 static char *get_key_attribute(struct udev *udev, char *str)
 984 {
 985         char *pos;
 986         char *attr;
 987
 988         attr = strchr(str, '{');
 989         if (attr != NULL) {
 990                 attr++;
 991                 pos = strchr(attr, '}');
 992                 if (pos == NULL) {
 993                         err(udev, "missing closing brace for format\n");
 994                         return NULL;
 995                 }
 996                 pos[0] = '\0';
 997                 dbg(udev, "attribute='%s'\n", attr);
 998                 return attr;
 999         }
1000         return NULL;
1001 }
1002
1003 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
1004                         enum operation_type op,
1005                         const char *value, const void *data)
1006 {
1007         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
1008         const char *attr = NULL;
1009
1010         memset(token, 0x00, sizeof(struct token));
1011
1012         switch (type) {
1013         case TK_M_ACTION:
1014         case TK_M_DEVPATH:
1015         case TK_M_KERNEL:
1016         case TK_M_SUBSYSTEM:
1017         case TK_M_DRIVER:
1018         case TK_M_WAITFOR:
1019         case TK_M_DEVLINK:
1020         case TK_M_NAME:
1021         case TK_M_KERNELS:
1022         case TK_M_SUBSYSTEMS:
1023         case TK_M_DRIVERS:
1024         case TK_M_TAGS:
1025         case TK_M_PROGRAM:
1026         case TK_M_IMPORT_FILE:
1027         case TK_M_IMPORT_PROG:
1028         case TK_M_IMPORT_DB:
1029         case TK_M_IMPORT_CMDLINE:
1030         case TK_M_IMPORT_PARENT:
1031         case TK_M_RESULT:
1032         case TK_A_OWNER:
1033         case TK_A_GROUP:
1034         case TK_A_MODE:
1035         case TK_A_NAME:
1036         case TK_A_GOTO:
1037         case TK_M_TAG:
1038         case TK_A_TAG:
1039                 token->key.value_off = add_string(rule_tmp->rules, value);
1040                 break;
1041         case TK_M_IMPORT_BUILTIN:
1042                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1043                 break;
1044         case TK_M_ENV:
1045         case TK_M_ATTR:
1046         case TK_M_ATTRS:
1047         case TK_A_ATTR:
1048         case TK_A_ENV:
1049                 attr = data;
1050                 token->key.value_off = add_string(rule_tmp->rules, value);
1051                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1052                 break;
1053         case TK_A_DEVLINK:
1054                 token->key.value_off = add_string(rule_tmp->rules, value);
1055                 token->key.devlink_unique = *(int *)data;
1056                 break;
1057         case TK_M_TEST:
1058                 token->key.value_off = add_string(rule_tmp->rules, value);
1059                 if (data != NULL)
1060                         token->key.mode = *(mode_t *)data;
1061                 break;
1062         case TK_A_STRING_ESCAPE_NONE:
1063         case TK_A_STRING_ESCAPE_REPLACE:
1064         case TK_A_DB_PERSIST:
1065                 break;
1066         case TK_A_RUN:
1067                 token->key.value_off = add_string(rule_tmp->rules, value);
1068                 break;
1069         case TK_A_INOTIFY_WATCH:
1070         case TK_A_DEVLINK_PRIO:
1071                 token->key.devlink_prio = *(int *)data;
1072                 break;
1073         case TK_A_OWNER_ID:
1074                 token->key.uid = *(uid_t *)data;
1075                 break;
1076         case TK_A_GROUP_ID:
1077                 token->key.gid = *(gid_t *)data;
1078                 break;
1079         case TK_A_MODE_ID:
1080                 token->key.mode = *(mode_t *)data;
1081                 break;
1082         case TK_A_STATIC_NODE:
1083                 token->key.value_off = add_string(rule_tmp->rules, value);
1084                 break;
1085         case TK_M_EVENT_TIMEOUT:
1086                 token->key.event_timeout = *(int *)data;
1087                 break;
1088         case TK_RULE:
1089         case TK_M_PARENTS_MIN:
1090         case TK_M_PARENTS_MAX:
1091         case TK_M_MAX:
1092         case TK_END:
1093         case TK_UNSET:
1094                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1095                 return -1;
1096         }
1097
1098         if (value != NULL && type < TK_M_MAX) {
1099                 /* check if we need to split or call fnmatch() while matching rules */
1100                 enum string_glob_type glob;
1101                 int has_split;
1102                 int has_glob;
1103
1104                 has_split = (strchr(value, '|') != NULL);
1105                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1106                 if (has_split && has_glob) {
1107                         glob = GL_SPLIT_GLOB;
1108                 } else if (has_split) {
1109                         glob = GL_SPLIT;
1110                 } else if (has_glob) {
1111                         if (strcmp(value, "?*") == 0)
1112                                 glob = GL_SOMETHING;
1113                         else
1114                                 glob = GL_GLOB;
1115                 } else {
1116                         glob = GL_PLAIN;
1117                 }
1118                 token->key.glob = glob;
1119         }
1120
1121         if (value != NULL && type > TK_M_MAX) {
1122                 /* check if assigned value has substitution chars */
1123                 if (value[0] == '[')
1124                         token->key.subst = SB_SUBSYS;
1125                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1126                         token->key.subst = SB_FORMAT;
1127                 else
1128                         token->key.subst = SB_NONE;
1129         }
1130
1131         if (attr != NULL) {
1132                 /* check if property/attribut name has substitution chars */
1133                 if (attr[0] == '[')
1134                         token->key.attrsubst = SB_SUBSYS;
1135                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1136                         token->key.attrsubst = SB_FORMAT;
1137                 else
1138                         token->key.attrsubst = SB_NONE;
1139         }
1140
1141         token->key.type = type;
1142         token->key.op = op;
1143         rule_tmp->token_cur++;
1144         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1145                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1146                 return -1;
1147         }
1148         return 0;
1149 }
1150
1151 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1152 {
1153         unsigned int i;
1154         unsigned int start = 0;
1155         unsigned int end = rule_tmp->token_cur;
1156
1157         for (i = 0; i < rule_tmp->token_cur; i++) {
1158                 enum token_type next_val = TK_UNSET;
1159                 unsigned int next_idx = 0;
1160                 unsigned int j;
1161
1162                 /* find smallest value */
1163                 for (j = start; j < end; j++) {
1164                         if (rule_tmp->token[j].type == TK_UNSET)
1165                                 continue;
1166                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1167                                 next_val = rule_tmp->token[j].type;
1168                                 next_idx = j;
1169                         }
1170                 }
1171
1172                 /* add token and mark done */
1173                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1174                         return -1;
1175                 rule_tmp->token[next_idx].type = TK_UNSET;
1176
1177                 /* shrink range */
1178                 if (next_idx == start)
1179                         start++;
1180                 if (next_idx+1 == end)
1181                         end--;
1182         }
1183         return 0;
1184 }
1185
1186 static int add_rule(struct udev_rules *rules, char *line,
1187                     const char *filename, unsigned int filename_off, unsigned int lineno)
1188 {
1189         char *linepos;
1190         char *attr;
1191         struct rule_tmp rule_tmp;
1192
1193         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1194         rule_tmp.rules = rules;
1195         rule_tmp.rule.type = TK_RULE;
1196         rule_tmp.rule.rule.filename_off = filename_off;
1197         rule_tmp.rule.rule.filename_line = lineno;
1198
1199         linepos = line;
1200         for (;;) {
1201                 char *key;
1202                 char *value;
1203                 enum operation_type op;
1204
1205                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1206                         break;
1207
1208                 if (strcmp(key, "ACTION") == 0) {
1209                         if (op > OP_MATCH_MAX) {
1210                                 err(rules->udev, "invalid ACTION operation\n");
1211                                 goto invalid;
1212                         }
1213                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1214                         continue;
1215                 }
1216
1217                 if (strcmp(key, "DEVPATH") == 0) {
1218                         if (op > OP_MATCH_MAX) {
1219                                 err(rules->udev, "invalid DEVPATH operation\n");
1220                                 goto invalid;
1221                         }
1222                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1223                         continue;
1224                 }
1225
1226                 if (strcmp(key, "KERNEL") == 0) {
1227                         if (op > OP_MATCH_MAX) {
1228                                 err(rules->udev, "invalid KERNEL operation\n");
1229                                 goto invalid;
1230                         }
1231                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1232                         continue;
1233                 }
1234
1235                 if (strcmp(key, "SUBSYSTEM") == 0) {
1236                         if (op > OP_MATCH_MAX) {
1237                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1238                                 goto invalid;
1239                         }
1240                         /* bus, class, subsystem events should all be the same */
1241                         if (strcmp(value, "subsystem") == 0 ||
1242                             strcmp(value, "bus") == 0 ||
1243                             strcmp(value, "class") == 0) {
1244                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1245                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1246                                             "please fix it in %s:%u", value, filename, lineno);
1247                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1248                         } else
1249                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1250                         continue;
1251                 }
1252
1253                 if (strcmp(key, "DRIVER") == 0) {
1254                         if (op > OP_MATCH_MAX) {
1255                                 err(rules->udev, "invalid DRIVER operation\n");
1256                                 goto invalid;
1257                         }
1258                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1259                         continue;
1260                 }
1261
1262                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1263                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1264                         if (attr == NULL) {
1265                                 err(rules->udev, "error parsing ATTR attribute\n");
1266                                 goto invalid;
1267                         }
1268                         if (op < OP_MATCH_MAX) {
1269                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1270                         } else {
1271                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1272                         }
1273                         continue;
1274                 }
1275
1276                 if (strcmp(key, "KERNELS") == 0) {
1277                         if (op > OP_MATCH_MAX) {
1278                                 err(rules->udev, "invalid KERNELS operation\n");
1279                                 goto invalid;
1280                         }
1281                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1282                         continue;
1283                 }
1284
1285                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1286                         if (op > OP_MATCH_MAX) {
1287                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1288                                 goto invalid;
1289                         }
1290                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1291                         continue;
1292                 }
1293
1294                 if (strcmp(key, "DRIVERS") == 0) {
1295                         if (op > OP_MATCH_MAX) {
1296                                 err(rules->udev, "invalid DRIVERS operation\n");
1297                                 goto invalid;
1298                         }
1299                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1300                         continue;
1301                 }
1302
1303                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1304                         if (op > OP_MATCH_MAX) {
1305                                 err(rules->udev, "invalid ATTRS operation\n");
1306                                 goto invalid;
1307                         }
1308                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1309                         if (attr == NULL) {
1310                                 err(rules->udev, "error parsing ATTRS attribute\n");
1311                                 goto invalid;
1312                         }
1313                         if (strncmp(attr, "device/", 7) == 0)
1314                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1315                                     "please fix it in %s:%u", filename, lineno);
1316                         else if (strstr(attr, "../") != NULL)
1317                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1318                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1319                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1320                         continue;
1321                 }
1322
1323                 if (strcmp(key, "TAGS") == 0) {
1324                         if (op > OP_MATCH_MAX) {
1325                                 err(rules->udev, "invalid TAGS operation\n");
1326                                 goto invalid;
1327                         }
1328                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1329                         continue;
1330                 }
1331
1332                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1333                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1334                         if (attr == NULL) {
1335                                 err(rules->udev, "error parsing ENV attribute\n");
1336                                 goto invalid;
1337                         }
1338                         if (op < OP_MATCH_MAX) {
1339                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1340                                         goto invalid;
1341                         } else {
1342                                 static const char *blacklist[] = {
1343                                         "ACTION",
1344                                         "SUBSYSTEM",
1345                                         "DEVTYPE",
1346                                         "MAJOR",
1347                                         "MINOR",
1348                                         "DRIVER",
1349                                         "IFINDEX",
1350                                         "DEVNAME",
1351                                         "DEVLINKS",
1352                                         "DEVPATH",
1353                                         "TAGS",
1354                                 };
1355                                 unsigned int i;
1356
1357                                 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1358                                         if (strcmp(attr, blacklist[i]) == 0) {
1359                                                 err(rules->udev, "invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1360                                                 continue;
1361                                         }
1362                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1363                                         goto invalid;
1364                         }
1365                         continue;
1366                 }
1367
1368                 if (strcmp(key, "TAG") == 0) {
1369                         if (op < OP_MATCH_MAX)
1370                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1371                         else
1372                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1373                         continue;
1374                 }
1375
1376                 if (strcmp(key, "PROGRAM") == 0) {
1377                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1378                         continue;
1379                 }
1380
1381                 if (strcmp(key, "RESULT") == 0) {
1382                         if (op > OP_MATCH_MAX) {
1383                                 err(rules->udev, "invalid RESULT operation\n");
1384                                 goto invalid;
1385                         }
1386                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1387                         continue;
1388                 }
1389
1390                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1391                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1392                         if (attr == NULL) {
1393                                 err(rules->udev, "IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1394                                 continue;
1395                         }
1396                         if (strstr(attr, "program")) {
1397                                 /* find known built-in command */
1398                                 if (value[0] != '/') {
1399                                         char file[UTIL_PATH_SIZE];
1400                                         char *pos;
1401                                         enum udev_builtin_cmd cmd;
1402
1403                                         util_strscpy(file, sizeof(file), value);
1404                                         pos = strchr(file, ' ');
1405                                         if (pos)
1406                                                 pos[0] = '\0';
1407                                         cmd = udev_builtin_lookup(file);
1408                                         if (cmd < UDEV_BUILTIN_MAX) {
1409                                                 info(rules->udev, "IMPORT found builtin '%s', replacing %s:%u\n", file, filename, lineno);
1410                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, NULL, &cmd);
1411                                                 continue;
1412                                         }
1413                                 }
1414                                 dbg(rules->udev, "IMPORT will be executed\n");
1415                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1416                         } else if (strstr(attr, "builtin")) {
1417                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1418
1419                                 dbg(rules->udev, "IMPORT execute builtin\n");
1420                                 if (cmd < UDEV_BUILTIN_MAX)
1421                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, NULL, &cmd);
1422                                 else
1423                                         err(rules->udev, "IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1424                         } else if (strstr(attr, "file")) {
1425                                 dbg(rules->udev, "IMPORT will be included as file\n");
1426                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1427                         } else if (strstr(attr, "db")) {
1428                                 dbg(rules->udev, "IMPORT will include db values\n");
1429                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1430                         } else if (strstr(attr, "cmdline")) {
1431                                 dbg(rules->udev, "IMPORT will include db values\n");
1432                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1433                         } else if (strstr(attr, "parent")) {
1434                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1435                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1436                         }
1437                         continue;
1438                 }
1439
1440                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1441                         mode_t mode = 0;
1442
1443                         if (op > OP_MATCH_MAX) {
1444                                 err(rules->udev, "invalid TEST operation\n");
1445                                 goto invalid;
1446                         }
1447                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1448                         if (attr != NULL) {
1449                                 mode = strtol(attr, NULL, 8);
1450                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1451                         } else {
1452                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1453                         }
1454                         continue;
1455                 }
1456
1457                 if (strcmp(key, "RUN") == 0) {
1458                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, NULL);
1459                         continue;
1460                 }
1461
1462                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1463                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1464                         continue;
1465                 }
1466
1467                 if (strcmp(key, "LABEL") == 0) {
1468                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1469                         continue;
1470                 }
1471
1472                 if (strcmp(key, "GOTO") == 0) {
1473                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1474                         continue;
1475                 }
1476
1477                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1478                         if (op < OP_MATCH_MAX) {
1479                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1480                         } else {
1481                                 if (strcmp(value, "%k") == 0) {
1482                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1483                                             "please remove it from %s:%u\n", filename, lineno);
1484                                         continue;
1485                                 }
1486                                 if (value[0] == '\0') {
1487                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1488                                              "please remove it from %s:%u\n", filename, lineno);
1489                                         continue;
1490                                 }
1491                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1492                         }
1493                         rule_tmp.rule.rule.can_set_name = true;
1494                         continue;
1495                 }
1496
1497                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1498                         if (op < OP_MATCH_MAX) {
1499                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1500                         } else {
1501                                 int flag = 0;
1502
1503                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1504                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1505                                         flag = 1;
1506                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1507                         }
1508                         rule_tmp.rule.rule.can_set_name = true;
1509                         continue;
1510                 }
1511
1512                 if (strcmp(key, "OWNER") == 0) {
1513                         uid_t uid;
1514                         char *endptr;
1515
1516                         uid = strtoul(value, &endptr, 10);
1517                         if (endptr[0] == '\0') {
1518                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1519                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1520                                 uid = add_uid(rules, value);
1521                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1522                         } else if (rules->resolve_names >= 0) {
1523                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1524                         }
1525                         rule_tmp.rule.rule.can_set_name = true;
1526                         continue;
1527                 }
1528
1529                 if (strcmp(key, "GROUP") == 0) {
1530                         gid_t gid;
1531                         char *endptr;
1532
1533                         gid = strtoul(value, &endptr, 10);
1534                         if (endptr[0] == '\0') {
1535                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1536                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1537                                 gid = add_gid(rules, value);
1538                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1539                         } else if (rules->resolve_names >= 0) {
1540                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1541                         }
1542                         rule_tmp.rule.rule.can_set_name = true;
1543                         continue;
1544                 }
1545
1546                 if (strcmp(key, "MODE") == 0) {
1547                         mode_t mode;
1548                         char *endptr;
1549
1550                         mode = strtol(value, &endptr, 8);
1551                         if (endptr[0] == '\0')
1552                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1553                         else
1554                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1555                         rule_tmp.rule.rule.can_set_name = true;
1556                         continue;
1557                 }
1558
1559                 if (strcmp(key, "OPTIONS") == 0) {
1560                         const char *pos;
1561
1562                         pos = strstr(value, "link_priority=");
1563                         if (pos != NULL) {
1564                                 int prio = atoi(&pos[strlen("link_priority=")]);
1565
1566                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1567                                 dbg(rules->udev, "link priority=%i\n", prio);
1568                         }
1569
1570                         pos = strstr(value, "event_timeout=");
1571                         if (pos != NULL) {
1572                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1573
1574                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1575                                 dbg(rules->udev, "event timeout=%i\n", tout);
1576                         }
1577
1578                         pos = strstr(value, "string_escape=");
1579                         if (pos != NULL) {
1580                                 pos = &pos[strlen("string_escape=")];
1581                                 if (strncmp(pos, "none", strlen("none")) == 0)
1582                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1583                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1584                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1585                         }
1586
1587                         pos = strstr(value, "db_persist");
1588                         if (pos != NULL)
1589                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1590
1591                         pos = strstr(value, "nowatch");
1592                         if (pos != NULL) {
1593                                 const int off = 0;
1594
1595                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1596                                 dbg(rules->udev, "inotify watch of device disabled\n");
1597                         } else {
1598                                 pos = strstr(value, "watch");
1599                                 if (pos != NULL) {
1600                                         const int on = 1;
1601
1602                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1603                                         dbg(rules->udev, "inotify watch of device requested\n");
1604                                 }
1605                         }
1606
1607                         pos = strstr(value, "static_node=");
1608                         if (pos != NULL) {
1609                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1610                                 rule_tmp.rule.rule.has_static_node = true;
1611                         }
1612
1613                         continue;
1614                 }
1615                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1616         }
1617
1618         /* add rule token */
1619         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1620         if (add_token(rules, &rule_tmp.rule) != 0)
1621                 goto invalid;
1622
1623         /* add tokens to list, sorted by type */
1624         if (sort_token(rules, &rule_tmp) != 0)
1625                 goto invalid;
1626
1627         return 0;
1628 invalid:
1629         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1630         return -1;
1631 }
1632
1633 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1634 {
1635         FILE *f;
1636         unsigned int first_token;
1637         char line[UTIL_LINE_SIZE];
1638         int line_nr = 0;
1639         unsigned int i;
1640
1641         info(rules->udev, "reading '%s' as rules file\n", filename);
1642
1643         f = fopen(filename, "r");
1644         if (f == NULL)
1645                 return -1;
1646
1647         first_token = rules->token_cur;
1648
1649         while (fgets(line, sizeof(line), f) != NULL) {
1650                 char *key;
1651                 size_t len;
1652
1653                 /* skip whitespace */
1654                 line_nr++;
1655                 key = line;
1656                 while (isspace(key[0]))
1657                         key++;
1658
1659                 /* comment */
1660                 if (key[0] == '#')
1661                         continue;
1662
1663                 len = strlen(line);
1664                 if (len < 3)
1665                         continue;
1666
1667                 /* continue reading if backslash+newline is found */
1668                 while (line[len-2] == '\\') {
1669                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1670                                 break;
1671                         if (strlen(&line[len-2]) < 2)
1672                                 break;
1673                         line_nr++;
1674                         len = strlen(line);
1675                 }
1676
1677                 if (len+1 >= sizeof(line)) {
1678                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1679                         continue;
1680                 }
1681                 add_rule(rules, key, filename, filename_off, line_nr);
1682         }
1683         fclose(f);
1684
1685         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1686         for (i = first_token+1; i < rules->token_cur; i++) {
1687                 if (rules->tokens[i].type == TK_A_GOTO) {
1688                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1689                         unsigned int j;
1690
1691                         for (j = i+1; j < rules->token_cur; j++) {
1692                                 if (rules->tokens[j].type != TK_RULE)
1693                                         continue;
1694                                 if (rules->tokens[j].rule.label_off == 0)
1695                                         continue;
1696                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1697                                         continue;
1698                                 rules->tokens[i].key.rule_goto = j;
1699                                 break;
1700                         }
1701                         if (rules->tokens[i].key.rule_goto == 0)
1702                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1703                 }
1704         }
1705         return 0;
1706 }
1707
1708 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1709 {
1710         DIR *dir;
1711         struct dirent *dent;
1712         char filename[UTIL_PATH_SIZE];
1713
1714         dbg(udev, "open directory '%s'\n", dirname);
1715         dir = opendir(dirname);
1716         if (dir == NULL) {
1717                 info(udev, "unable to open '%s': %m\n", dirname);
1718                 return -1;
1719         }
1720
1721         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1722                 if (dent->d_name[0] == '.')
1723                         continue;
1724
1725                 /* look for file matching with specified suffix */
1726                 if (suffix != NULL) {
1727                         const char *ext;
1728
1729                         ext = strrchr(dent->d_name, '.');
1730                         if (ext == NULL)
1731                                 continue;
1732                         if (strcmp(ext, suffix) != 0)
1733                                 continue;
1734                 }
1735                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1736                 dbg(udev, "put file '%s' into list\n", filename);
1737                 /*
1738                  * the basename is the key, the filename the value
1739                  * identical basenames from different directories overwrite each other
1740                  * entries are sorted after basename
1741                  */
1742                 udev_list_entry_add(file_list, dent->d_name, filename);
1743         }
1744
1745         closedir(dir);
1746         return 0;
1747 }
1748
1749 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1750 {
1751         struct udev_rules *rules;
1752         struct udev_list file_list;
1753         struct udev_list_entry *file_loop;
1754         struct token end_token;
1755
1756         rules = calloc(1, sizeof(struct udev_rules));
1757         if (rules == NULL)
1758                 return NULL;
1759         rules->udev = udev;
1760         rules->resolve_names = resolve_names;
1761         udev_list_init(udev, &file_list, true);
1762
1763         /* init token array and string buffer */
1764         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1765         if (rules->tokens == NULL) {
1766                 free(rules);
1767                 return NULL;
1768         }
1769         rules->token_max = PREALLOC_TOKEN;
1770
1771         rules->buf = malloc(PREALLOC_STRBUF);
1772         if (rules->buf == NULL) {
1773                 free(rules->tokens);
1774                 free(rules);
1775                 return NULL;
1776         }
1777         rules->buf_max = PREALLOC_STRBUF;
1778         /* offset 0 is always '\0' */
1779         rules->buf[0] = '\0';
1780         rules->buf_cur = 1;
1781         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1782             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1783
1784         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1785         if (rules->trie_nodes == NULL) {
1786                 free(rules->buf);
1787                 free(rules->tokens);
1788                 free(rules);
1789                 return NULL;
1790         }
1791         rules->trie_nodes_max = PREALLOC_TRIE;
1792         /* offset 0 is the trie root, with an empty string */
1793         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1794         rules->trie_nodes_cur = 1;
1795
1796         if (udev_get_rules_path(udev) == NULL) {
1797                 char filename[UTIL_PATH_SIZE];
1798
1799                 /* /lib/udev -- default/package rules */
1800                 add_matching_files(udev, &file_list, LIBEXECDIR "/rules.d", ".rules");
1801
1802                 /* /etc/udev -- system-specific/user/admin rules */
1803                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1804
1805                 /* /run/udev -- throw-away/temporary rules */
1806                 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1807                 add_matching_files(udev, &file_list, filename, ".rules");
1808         } else {
1809                 /* custom rules files location for testing */
1810                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1811         }
1812
1813         /* add all filenames to the string buffer */
1814         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1815                 const char *filename = udev_list_entry_get_value(file_loop);
1816                 unsigned int filename_off;
1817
1818                 filename_off = add_string(rules, filename);
1819                 /* the offset in the rule is limited to unsigned short */
1820                 if (filename_off < USHRT_MAX)
1821                         udev_list_entry_set_num(file_loop, filename_off);
1822         }
1823
1824         /* parse all rules files */
1825         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1826                 const char *filename = udev_list_entry_get_value(file_loop);
1827                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1828                 struct stat st;
1829
1830                 if (stat(filename, &st) != 0) {
1831                         err(udev, "can not find '%s': %m\n", filename);
1832                         continue;
1833                 }
1834                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1835                         info(udev, "ignore empty '%s'\n", filename);
1836                         continue;
1837                 }
1838                 if (S_ISCHR(st.st_mode)) {
1839                         info(udev, "ignore masked '%s'\n", filename);
1840                         continue;
1841                 }
1842                 parse_file(rules, filename, filename_off);
1843         }
1844         udev_list_cleanup(&file_list);
1845
1846         memset(&end_token, 0x00, sizeof(struct token));
1847         end_token.type = TK_END;
1848         add_token(rules, &end_token);
1849
1850         /* shrink allocated token and string buffer */
1851         if (rules->token_cur < rules->token_max) {
1852                 struct token *tokens;
1853
1854                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1855                 if (tokens != NULL || rules->token_cur == 0) {
1856                         rules->tokens = tokens;
1857                         rules->token_max = rules->token_cur;
1858                 }
1859         }
1860         if (rules->buf_cur < rules->buf_max) {
1861                 char *buf;
1862
1863                 buf = realloc(rules->buf, rules->buf_cur);
1864                 if (buf != NULL || rules->buf_cur == 0) {
1865                         rules->buf = buf;
1866                         rules->buf_max = rules->buf_cur;
1867                 }
1868         }
1869         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1870              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1871         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1872              rules->trie_nodes_cur * sizeof(struct trie_node),
1873              rules->trie_nodes_cur, sizeof(struct trie_node));
1874
1875         /* cleanup trie */
1876         free(rules->trie_nodes);
1877         rules->trie_nodes = NULL;
1878         rules->trie_nodes_cur = 0;
1879         rules->trie_nodes_max = 0;
1880
1881         /* cleanup uid/gid cache */
1882         free(rules->uids);
1883         rules->uids = NULL;
1884         rules->uids_cur = 0;
1885         rules->uids_max = 0;
1886         free(rules->gids);
1887         rules->gids = NULL;
1888         rules->gids_cur = 0;
1889         rules->gids_max = 0;
1890
1891         dump_rules(rules);
1892         return rules;
1893 }
1894
1895 void udev_rules_unref(struct udev_rules *rules)
1896 {
1897         if (rules == NULL)
1898                 return;
1899         free(rules->tokens);
1900         free(rules->buf);
1901         free(rules->trie_nodes);
1902         free(rules->uids);
1903         free(rules->gids);
1904         free(rules);
1905 }
1906
1907 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1908 {
1909         char *key_value = &rules->buf[token->key.value_off];
1910         char *pos;
1911         bool match = false;
1912
1913         if (val == NULL)
1914                 val = "";
1915
1916         switch (token->key.glob) {
1917         case GL_PLAIN:
1918                 match = (strcmp(key_value, val) == 0);
1919                 break;
1920         case GL_GLOB:
1921                 match = (fnmatch(key_value, val, 0) == 0);
1922                 break;
1923         case GL_SPLIT:
1924                 {
1925                         const char *split;
1926                         size_t len;
1927
1928                         split = &rules->buf[token->key.value_off];
1929                         len = strlen(val);
1930                         for (;;) {
1931                                 const char *next;
1932
1933                                 next = strchr(split, '|');
1934                                 if (next != NULL) {
1935                                         size_t matchlen = (size_t)(next - split);
1936
1937                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1938                                         if (match)
1939                                                 break;
1940                                 } else {
1941                                         match = (strcmp(split, val) == 0);
1942                                         break;
1943                                 }
1944                                 split = &next[1];
1945                         }
1946                         break;
1947                 }
1948         case GL_SPLIT_GLOB:
1949                 {
1950                         char value[UTIL_PATH_SIZE];
1951
1952                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1953                         key_value = value;
1954                         while (key_value != NULL) {
1955                                 pos = strchr(key_value, '|');
1956                                 if (pos != NULL) {
1957                                         pos[0] = '\0';
1958                                         pos = &pos[1];
1959                                 }
1960                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1961                                 match = (fnmatch(key_value, val, 0) == 0);
1962                                 if (match)
1963                                         break;
1964                                 key_value = pos;
1965                         }
1966                         break;
1967                 }
1968         case GL_SOMETHING:
1969                 match = (val[0] != '\0');
1970                 break;
1971         case GL_UNSET:
1972                 return -1;
1973         }
1974
1975         if (match && (token->key.op == OP_MATCH)) {
1976                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1977                 return 0;
1978         }
1979         if (!match && (token->key.op == OP_NOMATCH)) {
1980                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1981                 return 0;
1982         }
1983         dbg(rules->udev, "%s is not true\n", token_str(token->type));
1984         return -1;
1985 }
1986
1987 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1988 {
1989         const char *name;
1990         char nbuf[UTIL_NAME_SIZE];
1991         const char *value;
1992         char vbuf[UTIL_NAME_SIZE];
1993         size_t len;
1994
1995         name = &rules->buf[cur->key.attr_off];
1996         switch (cur->key.attrsubst) {
1997         case SB_FORMAT:
1998                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1999                 name = nbuf;
2000                 /* fall through */
2001         case SB_NONE:
2002                 value = udev_device_get_sysattr_value(dev, name);
2003                 if (value == NULL)
2004                         return -1;
2005                 break;
2006         case SB_SUBSYS:
2007                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2008                         return -1;
2009                 value = vbuf;
2010                 break;
2011         default:
2012                 return -1;
2013         }
2014
2015         /* remove trailing whitespace, if not asked to match for it */
2016         len = strlen(value);
2017         if (len > 0 && isspace(value[len-1])) {
2018                 const char *key_value;
2019                 size_t klen;
2020
2021                 key_value = &rules->buf[cur->key.value_off];
2022                 klen = strlen(key_value);
2023                 if (klen > 0 && !isspace(key_value[klen-1])) {
2024                         if (value != vbuf) {
2025                                 util_strscpy(vbuf, sizeof(vbuf), value);
2026                                 value = vbuf;
2027                         }
2028                         while (len > 0 && isspace(vbuf[--len]))
2029                                 vbuf[len] = '\0';
2030                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2031                 }
2032         }
2033
2034         return match_key(rules, cur, value);
2035 }
2036
2037 enum escape_type {
2038         ESCAPE_UNSET,
2039         ESCAPE_NONE,
2040         ESCAPE_REPLACE,
2041 };
2042
2043 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2044 {
2045         struct token *cur;
2046         struct token *rule;
2047         enum escape_type esc = ESCAPE_UNSET;
2048         bool can_set_name;
2049
2050         if (rules->tokens == NULL)
2051                 return -1;
2052
2053         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2054                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2055                          udev_device_get_ifindex(event->dev) > 0));
2056
2057         /* loop through token list, match, run actions or forward to next rule */
2058         cur = &rules->tokens[0];
2059         rule = cur;
2060         for (;;) {
2061                 dump_token(rules, cur);
2062                 switch (cur->type) {
2063                 case TK_RULE:
2064                         /* current rule */
2065                         rule = cur;
2066                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2067                         if (!can_set_name && rule->rule.can_set_name)
2068                                 goto nomatch;
2069                         esc = ESCAPE_UNSET;
2070                         break;
2071                 case TK_M_ACTION:
2072                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2073                                 goto nomatch;
2074                         break;
2075                 case TK_M_DEVPATH:
2076                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2077                                 goto nomatch;
2078                         break;
2079                 case TK_M_KERNEL:
2080                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2081                                 goto nomatch;
2082                         break;
2083                 case TK_M_DEVLINK: {
2084                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2085                         struct udev_list_entry *list_entry;
2086                         bool match = false;
2087
2088                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2089                                 const char *devlink;
2090
2091                                 devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2092                                 if (match_key(rules, cur, devlink) == 0) {
2093                                         match = true;
2094                                         break;
2095                                 }
2096                         }
2097                         if (!match)
2098                                 goto nomatch;
2099                         break;
2100                 }
2101                 case TK_M_NAME:
2102                         if (match_key(rules, cur, event->name) != 0)
2103                                 goto nomatch;
2104                         break;
2105                 case TK_M_ENV: {
2106                         const char *key_name = &rules->buf[cur->key.attr_off];
2107                         const char *value;
2108
2109                         value = udev_device_get_property_value(event->dev, key_name);
2110                         if (value == NULL) {
2111                                 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2112                                 value = "";
2113                         }
2114                         if (match_key(rules, cur, value))
2115                                 goto nomatch;
2116                         break;
2117                 }
2118                 case TK_M_TAG: {
2119                         struct udev_list_entry *list_entry;
2120                         bool match = false;
2121
2122                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2123                                 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2124                                         match = true;
2125                                         break;
2126                                 }
2127                         }
2128                         if (!match && (cur->key.op != OP_NOMATCH))
2129                                 goto nomatch;
2130                         break;
2131                 }
2132                 case TK_M_SUBSYSTEM:
2133                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2134                                 goto nomatch;
2135                         break;
2136                 case TK_M_DRIVER:
2137                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2138                                 goto nomatch;
2139                         break;
2140                 case TK_M_WAITFOR: {
2141                         char filename[UTIL_PATH_SIZE];
2142                         int found;
2143
2144                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2145                         found = (wait_for_file(event->dev, filename, 10) == 0);
2146                         if (!found && (cur->key.op != OP_NOMATCH))
2147                                 goto nomatch;
2148                         break;
2149                 }
2150                 case TK_M_ATTR:
2151                         if (match_attr(rules, event->dev, event, cur) != 0)
2152                                 goto nomatch;
2153                         break;
2154                 case TK_M_KERNELS:
2155                 case TK_M_SUBSYSTEMS:
2156                 case TK_M_DRIVERS:
2157                 case TK_M_ATTRS:
2158                 case TK_M_TAGS: {
2159                         struct token *next;
2160
2161                         /* get whole sequence of parent matches */
2162                         next = cur;
2163                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2164                                 next++;
2165
2166                         /* loop over parents */
2167                         event->dev_parent = event->dev;
2168                         for (;;) {
2169                                 struct token *key;
2170
2171                                 dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2172                                 /* loop over sequence of parent match keys */
2173                                 for (key = cur; key < next; key++ ) {
2174                                         dump_token(rules, key);
2175                                         switch(key->type) {
2176                                         case TK_M_KERNELS:
2177                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2178                                                         goto try_parent;
2179                                                 break;
2180                                         case TK_M_SUBSYSTEMS:
2181                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2182                                                         goto try_parent;
2183                                                 break;
2184                                         case TK_M_DRIVERS:
2185                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2186                                                         goto try_parent;
2187                                                 break;
2188                                         case TK_M_ATTRS:
2189                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2190                                                         goto try_parent;
2191                                                 break;
2192                                         case TK_M_TAGS: {
2193                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2194
2195                                                 if (match && key->key.op == OP_NOMATCH)
2196                                                         goto try_parent;
2197                                                 if (!match && key->key.op == OP_MATCH)
2198                                                         goto try_parent;
2199                                                 break;
2200                                         }
2201                                         default:
2202                                                 goto nomatch;
2203                                         }
2204                                         dbg(event->udev, "parent key matched\n");
2205                                 }
2206                                 dbg(event->udev, "all parent keys matched\n");
2207                                 break;
2208
2209                         try_parent:
2210                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2211                                 if (event->dev_parent == NULL)
2212                                         goto nomatch;
2213                         }
2214                         /* move behind our sequence of parent match keys */
2215                         cur = next;
2216                         continue;
2217                 }
2218                 case TK_M_TEST: {
2219                         char filename[UTIL_PATH_SIZE];
2220                         struct stat statbuf;
2221                         int match;
2222
2223                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2224                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2225                                 if (filename[0] != '/') {
2226                                         char tmp[UTIL_PATH_SIZE];
2227
2228                                         util_strscpy(tmp, sizeof(tmp), filename);
2229                                         util_strscpyl(filename, sizeof(filename),
2230                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2231                                 }
2232                         }
2233                         attr_subst_subdir(filename, sizeof(filename));
2234
2235                         match = (stat(filename, &statbuf) == 0);
2236                         dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2237                         if (match && cur->key.mode > 0) {
2238                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2239                                 dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2240                                     match ? "matches" : "does not match", cur->key.mode);
2241                         }
2242                         if (match && cur->key.op == OP_NOMATCH)
2243                                 goto nomatch;
2244                         if (!match && cur->key.op == OP_MATCH)
2245                                 goto nomatch;
2246                         break;
2247                 }
2248                 case TK_M_EVENT_TIMEOUT:
2249                         info(event->udev, "OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2250                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2251                         break;
2252                 case TK_M_PROGRAM: {
2253                         char program[UTIL_PATH_SIZE];
2254                         char **envp;
2255                         char result[UTIL_PATH_SIZE];
2256
2257                         free(event->program_result);
2258                         event->program_result = NULL;
2259                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2260                         envp = udev_device_get_properties_envp(event->dev);
2261                         info(event->udev, "PROGRAM '%s' %s:%u\n",
2262                              program,
2263                              &rules->buf[rule->rule.filename_off],
2264                              rule->rule.filename_line);
2265
2266                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2267                                 if (cur->key.op != OP_NOMATCH)
2268                                         goto nomatch;
2269                         } else {
2270                                 int count;
2271
2272                                 util_remove_trailing_chars(result, '\n');
2273                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2274                                         count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2275                                         if (count > 0)
2276                                                 info(event->udev, "%i character(s) replaced\n" , count);
2277                                 }
2278                                 event->program_result = strdup(result);
2279                                 dbg(event->udev, "storing result '%s'\n", event->program_result);
2280                                 if (cur->key.op == OP_NOMATCH)
2281                                         goto nomatch;
2282                         }
2283                         break;
2284                 }
2285                 case TK_M_IMPORT_FILE: {
2286                         char import[UTIL_PATH_SIZE];
2287
2288                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2289                         if (import_file_into_properties(event->dev, import) != 0)
2290                                 if (cur->key.op != OP_NOMATCH)
2291                                         goto nomatch;
2292                         break;
2293                 }
2294                 case TK_M_IMPORT_PROG: {
2295                         char import[UTIL_PATH_SIZE];
2296
2297                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2298                         info(event->udev, "IMPORT '%s' %s:%u\n",
2299                              import,
2300                              &rules->buf[rule->rule.filename_off],
2301                              rule->rule.filename_line);
2302
2303                         if (import_program_into_properties(event, import, sigmask) != 0)
2304                                 if (cur->key.op != OP_NOMATCH)
2305                                         goto nomatch;
2306                         break;
2307                 }
2308                 case TK_M_IMPORT_BUILTIN: {
2309                         /* check if we ran already */
2310                         if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2311                                 info(event->udev, "IMPORT builtin skip '%s' %s:%u\n",
2312                                      udev_builtin_name(cur->key.builtin_cmd),
2313                                      &rules->buf[rule->rule.filename_off],
2314                                      rule->rule.filename_line);
2315                                 /* return the result from earlier run */
2316                                 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2317                                         if (cur->key.op != OP_NOMATCH)
2318                                                 goto nomatch;
2319                                 break;
2320                         }
2321                         /* mark as ran */
2322                         event->builtin_run |= (1 << cur->key.builtin_cmd);
2323                         info(event->udev, "IMPORT builtin '%s' %s:%u\n",
2324                              udev_builtin_name(cur->key.builtin_cmd),
2325                              &rules->buf[rule->rule.filename_off],
2326                              rule->rule.filename_line);
2327                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, false) != 0) {
2328                                 /* remember failure */
2329                                 info(rules->udev, "IMPORT builtin '%s' returned non-zero\n",
2330                                      udev_builtin_name(cur->key.builtin_cmd));
2331                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2332                                 if (cur->key.op != OP_NOMATCH)
2333                                         goto nomatch;
2334                         }
2335                         break;
2336                 }
2337                 case TK_M_IMPORT_DB: {
2338                         const char *key = &rules->buf[cur->key.value_off];
2339                         const char *value;
2340
2341                         value = udev_device_get_property_value(event->dev_db, key);
2342                         if (value != NULL) {
2343                                 struct udev_list_entry *entry;
2344
2345                                 entry = udev_device_add_property(event->dev, key, value);
2346                                 udev_list_entry_set_num(entry, true);
2347                         } else {
2348                                 if (cur->key.op != OP_NOMATCH)
2349                                         goto nomatch;
2350                         }
2351                         break;
2352                 }
2353                 case TK_M_IMPORT_CMDLINE: {
2354                         FILE *f;
2355                         bool imported = false;
2356
2357                         f = fopen("/proc/cmdline", "r");
2358                         if (f != NULL) {
2359                                 char cmdline[4096];
2360
2361                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2362                                         const char *key = &rules->buf[cur->key.value_off];
2363                                         char *pos;
2364
2365                                         pos = strstr(cmdline, key);
2366                                         if (pos != NULL) {
2367                                                 struct udev_list_entry *entry;
2368
2369                                                 pos += strlen(key);
2370                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2371                                                         /* we import simple flags as 'FLAG=1' */
2372                                                         entry = udev_device_add_property(event->dev, key, "1");
2373                                                         udev_list_entry_set_num(entry, true);
2374                                                         imported = true;
2375                                                 } else if (pos[0] == '=') {
2376                                                         const char *value;
2377
2378                                                         pos++;
2379                                                         value = pos;
2380                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2381                                                                 pos++;
2382                                                         pos[0] = '\0';
2383                                                         entry = udev_device_add_property(event->dev, key, value);
2384                                                         udev_list_entry_set_num(entry, true);
2385                                                         imported = true;
2386                                                 }
2387                                         }
2388                                 }
2389                                 fclose(f);
2390                         }
2391                         if (!imported && cur->key.op != OP_NOMATCH)
2392                                 goto nomatch;
2393                         break;
2394                 }
2395                 case TK_M_IMPORT_PARENT: {
2396                         char import[UTIL_PATH_SIZE];
2397
2398                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2399                         if (import_parent_into_properties(event->dev, import) != 0)
2400                                 if (cur->key.op != OP_NOMATCH)
2401                                         goto nomatch;
2402                         break;
2403                 }
2404                 case TK_M_RESULT:
2405                         if (match_key(rules, cur, event->program_result) != 0)
2406                                 goto nomatch;
2407                         break;
2408                 case TK_A_STRING_ESCAPE_NONE:
2409                         esc = ESCAPE_NONE;
2410                         break;
2411                 case TK_A_STRING_ESCAPE_REPLACE:
2412                         esc = ESCAPE_REPLACE;
2413                         break;
2414                 case TK_A_DB_PERSIST:
2415                         udev_device_set_db_persist(event->dev);
2416                         break;
2417                 case TK_A_INOTIFY_WATCH:
2418                         if (event->inotify_watch_final)
2419                                 break;
2420                         if (cur->key.op == OP_ASSIGN_FINAL)
2421                                 event->inotify_watch_final = true;
2422                         event->inotify_watch = cur->key.watch;
2423                         break;
2424                 case TK_A_DEVLINK_PRIO:
2425                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2426                         break;
2427                 case TK_A_OWNER: {
2428                         char owner[UTIL_NAME_SIZE];
2429
2430                         if (event->owner_final)
2431                                 break;
2432                         if (cur->key.op == OP_ASSIGN_FINAL)
2433                                 event->owner_final = true;
2434                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2435                         event->uid = util_lookup_user(event->udev, owner);
2436                         info(event->udev, "OWNER %u %s:%u\n",
2437                              event->uid,
2438                              &rules->buf[rule->rule.filename_off],
2439                              rule->rule.filename_line);
2440                         break;
2441                 }
2442                 case TK_A_GROUP: {
2443                         char group[UTIL_NAME_SIZE];
2444
2445                         if (event->group_final)
2446                                 break;
2447                         if (cur->key.op == OP_ASSIGN_FINAL)
2448                                 event->group_final = true;
2449                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2450                         event->gid = util_lookup_group(event->udev, group);
2451                         info(event->udev, "GROUP %u %s:%u\n",
2452                              event->gid,
2453                              &rules->buf[rule->rule.filename_off],
2454                              rule->rule.filename_line);
2455                         break;
2456                 }
2457                 case TK_A_MODE: {
2458                         char mode_str[UTIL_NAME_SIZE];
2459                         mode_t mode;
2460                         char *endptr;
2461
2462                         if (event->mode_final)
2463                                 break;
2464                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2465                         mode = strtol(mode_str, &endptr, 8);
2466                         if (endptr[0] != '\0') {
2467                                 err(event->udev, "ignoring invalid mode '%s'\n", mode_str);
2468                                 break;
2469                         }
2470                         if (cur->key.op == OP_ASSIGN_FINAL)
2471                                 event->mode_final = true;
2472                         event->mode_set = true;
2473                         event->mode = mode;
2474                         info(event->udev, "MODE %#o %s:%u\n",
2475                              event->mode,
2476                              &rules->buf[rule->rule.filename_off],
2477                              rule->rule.filename_line);
2478                         break;
2479                 }
2480                 case TK_A_OWNER_ID:
2481                         if (event->owner_final)
2482                                 break;
2483                         if (cur->key.op == OP_ASSIGN_FINAL)
2484                                 event->owner_final = true;
2485                         event->uid = cur->key.uid;
2486                         info(event->udev, "OWNER %u %s:%u\n",
2487                              event->uid,
2488                              &rules->buf[rule->rule.filename_off],
2489                              rule->rule.filename_line);
2490                         break;
2491                 case TK_A_GROUP_ID:
2492                         if (event->group_final)
2493                                 break;
2494                         if (cur->key.op == OP_ASSIGN_FINAL)
2495                                 event->group_final = true;
2496                         event->gid = cur->key.gid;
2497                         info(event->udev, "GROUP %u %s:%u\n",
2498                              event->gid,
2499                              &rules->buf[rule->rule.filename_off],
2500                              rule->rule.filename_line);
2501                         break;
2502                 case TK_A_MODE_ID:
2503                         if (event->mode_final)
2504                                 break;
2505                         if (cur->key.op == OP_ASSIGN_FINAL)
2506                                 event->mode_final = true;
2507                         event->mode_set = true;
2508                         event->mode = cur->key.mode;
2509                         info(event->udev, "MODE %#o %s:%u\n",
2510                              event->mode,
2511                              &rules->buf[rule->rule.filename_off],
2512                              rule->rule.filename_line);
2513                         break;
2514                 case TK_A_STATIC_NODE:
2515                         event->static_node = true;
2516                         break;
2517                 case TK_A_ENV: {
2518                         const char *name = &rules->buf[cur->key.attr_off];
2519                         char *value = &rules->buf[cur->key.value_off];
2520
2521                         if (value[0] != '\0') {
2522                                 char temp_value[UTIL_NAME_SIZE];
2523                                 struct udev_list_entry *entry;
2524
2525                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2526                                 entry = udev_device_add_property(event->dev, name, temp_value);
2527                                 /* store in db, skip private keys */
2528                                 if (name[0] != '.')
2529                                         udev_list_entry_set_num(entry, true);
2530                         } else {
2531                                 udev_device_add_property(event->dev, name, NULL);
2532                         }
2533                         break;
2534                 }
2535                 case TK_A_TAG: {
2536                         char tag[UTIL_PATH_SIZE];
2537                         const char *p;
2538
2539                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2540                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2541                                 udev_device_cleanup_tags_list(event->dev);
2542                         for (p = tag; *p != '\0'; p++) {
2543                                 if ((*p >= 'a' && *p <= 'z') ||
2544                                     (*p >= 'A' && *p <= 'Z') ||
2545                                     (*p >= '0' && *p <= '9') ||
2546                                     *p == '-' || *p == '_')
2547                                         continue;
2548                                 err(event->udev, "ignoring invalid tag name '%s'\n", tag);
2549                                 break;
2550                         }
2551                         udev_device_add_tag(event->dev, tag);
2552                         break;
2553                 }
2554                 case TK_A_NAME: {
2555                         const char *name  = &rules->buf[cur->key.value_off];
2556                         char name_str[UTIL_PATH_SIZE];
2557                         int count;
2558
2559                         if (event->name_final)
2560                                 break;
2561                         if (cur->key.op == OP_ASSIGN_FINAL)
2562                                 event->name_final = true;
2563                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2564                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2565                                 count = udev_util_replace_chars(name_str, "/");
2566                                 if (count > 0)
2567                                         info(event->udev, "%i character(s) replaced\n", count);
2568                         }
2569                         free(event->name);
2570                         event->name = strdup(name_str);
2571                         info(event->udev, "NAME '%s' %s:%u\n",
2572                              event->name,
2573                              &rules->buf[rule->rule.filename_off],
2574                              rule->rule.filename_line);
2575                         break;
2576                 }
2577                 case TK_A_DEVLINK: {
2578                         char temp[UTIL_PATH_SIZE];
2579                         char filename[UTIL_PATH_SIZE];
2580                         char *pos, *next;
2581                         int count = 0;
2582
2583                         if (event->devlink_final)
2584                                 break;
2585                         if (major(udev_device_get_devnum(event->dev)) == 0)
2586                                 break;
2587                         if (cur->key.op == OP_ASSIGN_FINAL)
2588                                 event->devlink_final = true;
2589                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2590                                 udev_device_cleanup_devlinks_list(event->dev);
2591
2592                         /* allow  multiple symlinks separated by spaces */
2593                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2594                         if (esc == ESCAPE_UNSET)
2595                                 count = udev_util_replace_chars(temp, "/ ");
2596                         else if (esc == ESCAPE_REPLACE)
2597                                 count = udev_util_replace_chars(temp, "/");
2598                         if (count > 0)
2599                                 info(event->udev, "%i character(s) replaced\n" , count);
2600                         dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2601                         pos = temp;
2602                         while (isspace(pos[0]))
2603                                 pos++;
2604                         next = strchr(pos, ' ');
2605                         while (next != NULL) {
2606                                 next[0] = '\0';
2607                                 info(event->udev, "LINK '%s' %s:%u\n", pos,
2608                                      &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2609                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2610                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2611                                 while (isspace(next[1]))
2612                                         next++;
2613                                 pos = &next[1];
2614                                 next = strchr(pos, ' ');
2615                         }
2616                         if (pos[0] != '\0') {
2617                                 info(event->udev, "LINK '%s' %s:%u\n", pos,
2618                                      &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2619                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2620                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2621                         }
2622                         break;
2623                 }
2624                 case TK_A_ATTR: {
2625                         const char *key_name = &rules->buf[cur->key.attr_off];
2626                         char attr[UTIL_PATH_SIZE];
2627                         char value[UTIL_NAME_SIZE];
2628                         FILE *f;
2629
2630                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2631                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2632                         attr_subst_subdir(attr, sizeof(attr));
2633
2634                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2635                         info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2636                              &rules->buf[rule->rule.filename_off],
2637                              rule->rule.filename_line);
2638                         f = fopen(attr, "w");
2639                         if (f != NULL) {
2640                                 if (fprintf(f, "%s", value) <= 0)
2641                                         err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2642                                 fclose(f);
2643                         } else {
2644                                 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2645                         }
2646                         break;
2647                 }
2648                 case TK_A_RUN: {
2649                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2650                                 udev_list_cleanup(&event->run_list);
2651                         info(event->udev, "RUN '%s' %s:%u\n",
2652                              &rules->buf[cur->key.value_off],
2653                              &rules->buf[rule->rule.filename_off],
2654                              rule->rule.filename_line);
2655                         udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2656                         break;
2657                 }
2658                 case TK_A_GOTO:
2659                         if (cur->key.rule_goto == 0)
2660                                 break;
2661                         cur = &rules->tokens[cur->key.rule_goto];
2662                         continue;
2663                 case TK_END:
2664                         return 0;
2665
2666                 case TK_M_PARENTS_MIN:
2667                 case TK_M_PARENTS_MAX:
2668                 case TK_M_MAX:
2669                 case TK_UNSET:
2670                         err(rules->udev, "wrong type %u\n", cur->type);
2671                         goto nomatch;
2672                 }
2673
2674                 cur++;
2675                 continue;
2676         nomatch:
2677                 /* fast-forward to next rule */
2678                 cur = rule + rule->rule.token_count;
2679                 dbg(rules->udev, "forward to rule: %u\n",
2680                                  (unsigned int) (cur - rules->tokens));
2681         }
2682 }
2683
2684 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2685 {
2686         struct token *cur;
2687         struct token *rule;
2688         uid_t uid = 0;
2689         gid_t gid = 0;
2690         mode_t mode = 0;
2691
2692         if (rules->tokens == NULL)
2693                 return;
2694
2695         cur = &rules->tokens[0];
2696         rule = cur;
2697         for (;;) {
2698                 switch (cur->type) {
2699                 case TK_RULE:
2700                         /* current rule */
2701                         rule = cur;
2702
2703                         /* skip rules without a static_node tag */
2704                         if (!rule->rule.has_static_node)
2705                                 goto next;
2706
2707                         uid = 0;
2708                         gid = 0;
2709                         mode = 0;
2710                         break;
2711                 case TK_A_OWNER_ID:
2712                         uid = cur->key.uid;
2713                         break;
2714                 case TK_A_GROUP_ID:
2715                         gid = cur->key.gid;
2716                         break;
2717                 case TK_A_MODE_ID:
2718                         mode = cur->key.mode;
2719                         break;
2720                 case TK_A_STATIC_NODE: {
2721                         char filename[UTIL_PATH_SIZE];
2722                         struct stat stats;
2723
2724                         /* we assure, that the permissions tokens are sorted before the static token */
2725                         if (mode == 0 && uid == 0 && gid == 0)
2726                                 goto next;
2727                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2728                                       &rules->buf[cur->key.value_off], NULL);
2729                         if (stat(filename, &stats) != 0)
2730                                 goto next;
2731                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2732                                 goto next;
2733                         if (mode == 0) {
2734                                 if (gid > 0)
2735                                         mode = 0660;
2736                                 else
2737                                         mode = 0600;
2738                         }
2739                         /* set sticky bit, so we do not remove the node on module unload */
2740                         mode |= 01000;
2741                         if (mode != (stats.st_mode & 01777)) {
2742                                 chmod(filename, mode);
2743                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2744                         }
2745
2746                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2747                                 chown(filename, uid, gid);
2748                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2749                         }
2750
2751                         utimensat(AT_FDCWD, filename, NULL, 0);
2752                         break;
2753                 }
2754                 case TK_END:
2755                         return;
2756                 }
2757
2758                 cur++;
2759                 continue;
2760 next:
2761                 /* fast-forward to next rule */
2762                 cur = rule + rule->rule.token_count;
2763                 continue;
2764         }
2765 }