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                                 int fail_on_error;
 202                                 unsigned int rule_goto;
 203                                 mode_t  mode;
 204                                 uid_t uid;
 205                                 gid_t gid;
 206                                 int devlink_prio;
 207                                 int event_timeout;
 208                                 int watch;
 209                                 enum udev_builtin_cmd builtin_cmd;
 210                         };
 211                 } key;
 212         };
 213 };
 214
 215 #define MAX_TK          64
 216 struct rule_tmp {
 217         struct udev_rules *rules;
 218         struct token rule;
 219         struct token token[MAX_TK];
 220         unsigned int token_cur;
 221 };
 222
 223 #ifdef ENABLE_DEBUG
 224 static const char *operation_str(enum operation_type type)
 225 {
 226         static const char *operation_strs[] = {
 227                 [OP_UNSET] =            "UNSET",
 228                 [OP_MATCH] =            "match",
 229                 [OP_NOMATCH] =          "nomatch",
 230                 [OP_MATCH_MAX] =        "MATCH_MAX",
 231
 232                 [OP_ADD] =              "add",
 233                 [OP_ASSIGN] =           "assign",
 234                 [OP_ASSIGN_FINAL] =     "assign-final",
 235 }       ;
 236
 237         return operation_strs[type];
 238 }
 239
 240 static const char *string_glob_str(enum string_glob_type type)
 241 {
 242         static const char *string_glob_strs[] = {
 243                 [GL_UNSET] =            "UNSET",
 244                 [GL_PLAIN] =            "plain",
 245                 [GL_GLOB] =             "glob",
 246                 [GL_SPLIT] =            "split",
 247                 [GL_SPLIT_GLOB] =       "split-glob",
 248                 [GL_SOMETHING] =        "split-glob",
 249         };
 250
 251         return string_glob_strs[type];
 252 }
 253
 254 static const char *token_str(enum token_type type)
 255 {
 256         static const char *token_strs[] = {
 257                 [TK_UNSET] =                    "UNSET",
 258                 [TK_RULE] =                     "RULE",
 259
 260                 [TK_M_ACTION] =                 "M ACTION",
 261                 [TK_M_DEVPATH] =                "M DEVPATH",
 262                 [TK_M_KERNEL] =                 "M KERNEL",
 263                 [TK_M_DEVLINK] =                "M DEVLINK",
 264                 [TK_M_NAME] =                   "M NAME",
 265                 [TK_M_ENV] =                    "M ENV",
 266                 [TK_M_TAG] =                    "M TAG",
 267                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 268                 [TK_M_DRIVER] =                 "M DRIVER",
 269                 [TK_M_WAITFOR] =                "M WAITFOR",
 270                 [TK_M_ATTR] =                   "M ATTR",
 271
 272                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 273                 [TK_M_KERNELS] =                "M KERNELS",
 274                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 275                 [TK_M_DRIVERS] =                "M DRIVERS",
 276                 [TK_M_ATTRS] =                  "M ATTRS",
 277                 [TK_M_TAGS] =                   "M TAGS",
 278                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 279
 280                 [TK_M_TEST] =                   "M TEST",
 281                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 282                 [TK_M_PROGRAM] =                "M PROGRAM",
 283                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 284                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 285                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 286                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 287                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 288                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 289                 [TK_M_RESULT] =                 "M RESULT",
 290                 [TK_M_MAX] =                    "M MAX",
 291
 292                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 293                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 294                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 295                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 296                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 297                 [TK_A_OWNER] =                  "A OWNER",
 298                 [TK_A_GROUP] =                  "A GROUP",
 299                 [TK_A_MODE] =                   "A MODE",
 300                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 301                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 302                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 303                 [TK_A_MODE_ID] =                "A MODE_ID",
 304                 [TK_A_ENV] =                    "A ENV",
 305                 [TK_A_TAG] =                    "A ENV",
 306                 [TK_A_NAME] =                   "A NAME",
 307                 [TK_A_DEVLINK] =                "A DEVLINK",
 308                 [TK_A_ATTR] =                   "A ATTR",
 309                 [TK_A_RUN] =                    "A RUN",
 310                 [TK_A_GOTO] =                   "A GOTO",
 311
 312                 [TK_END] =                      "END",
 313         };
 314
 315         return token_strs[type];
 316 }
 317
 318 static void dump_token(struct udev_rules *rules, struct token *token)
 319 {
 320         enum token_type type = token->type;
 321         enum operation_type op = token->key.op;
 322         enum string_glob_type glob = token->key.glob;
 323         const char *value = &rules->buf[token->key.value_off];
 324         const char *attr = &rules->buf[token->key.attr_off];
 325
 326         switch (type) {
 327         case TK_RULE:
 328                 {
 329                         const char *tks_ptr = (char *)rules->tokens;
 330                         const char *tk_ptr = (char *)token;
 331                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 332
 333                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 334                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 335                             idx, token->rule.token_count,
 336                             &rules->buf[token->rule.label_off]);
 337                         break;
 338                 }
 339         case TK_M_ACTION:
 340         case TK_M_DEVPATH:
 341         case TK_M_KERNEL:
 342         case TK_M_SUBSYSTEM:
 343         case TK_M_DRIVER:
 344         case TK_M_WAITFOR:
 345         case TK_M_DEVLINK:
 346         case TK_M_NAME:
 347         case TK_M_KERNELS:
 348         case TK_M_SUBSYSTEMS:
 349         case TK_M_DRIVERS:
 350         case TK_M_TAGS:
 351         case TK_M_PROGRAM:
 352         case TK_M_IMPORT_FILE:
 353         case TK_M_IMPORT_PROG:
 354         case TK_M_IMPORT_DB:
 355         case TK_M_IMPORT_CMDLINE:
 356         case TK_M_IMPORT_PARENT:
 357         case TK_M_RESULT:
 358         case TK_A_NAME:
 359         case TK_A_DEVLINK:
 360         case TK_A_OWNER:
 361         case TK_A_GROUP:
 362         case TK_A_MODE:
 363         case TK_A_RUN:
 364                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 365                     token_str(type), operation_str(op), value, string_glob_str(glob));
 366                 break;
 367         case TK_M_IMPORT_BUILTIN:
 368                 dbg(rules->udev, "%s %i\n", token_str(type), token->key.builtin_cmd);
 369                 break;
 370         case TK_M_ATTR:
 371         case TK_M_ATTRS:
 372         case TK_M_ENV:
 373         case TK_A_ATTR:
 374         case TK_A_ENV:
 375                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 376                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 377                 break;
 378         case TK_M_TAG:
 379         case TK_A_TAG:
 380                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 381                 break;
 382         case TK_A_STRING_ESCAPE_NONE:
 383         case TK_A_STRING_ESCAPE_REPLACE:
 384         case TK_A_DB_PERSIST:
 385                 dbg(rules->udev, "%s\n", token_str(type));
 386                 break;
 387         case TK_M_TEST:
 388                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 389                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 390                 break;
 391         case TK_A_INOTIFY_WATCH:
 392                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 393                 break;
 394         case TK_A_DEVLINK_PRIO:
 395                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 396                 break;
 397         case TK_A_OWNER_ID:
 398                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 399                 break;
 400         case TK_A_GROUP_ID:
 401                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 402                 break;
 403         case TK_A_MODE_ID:
 404                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 405                 break;
 406         case TK_A_STATIC_NODE:
 407                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 408                 break;
 409         case TK_M_EVENT_TIMEOUT:
 410                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 411                 break;
 412         case TK_A_GOTO:
 413                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 414                 break;
 415         case TK_END:
 416                 dbg(rules->udev, "* %s\n", token_str(type));
 417                 break;
 418         case TK_M_PARENTS_MIN:
 419         case TK_M_PARENTS_MAX:
 420         case TK_M_MAX:
 421         case TK_UNSET:
 422                 dbg(rules->udev, "unknown type %u\n", type);
 423                 break;
 424         }
 425 }
 426
 427 static void dump_rules(struct udev_rules *rules)
 428 {
 429         unsigned int i;
 430
 431         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 432             rules->token_cur,
 433             rules->token_cur * sizeof(struct token),
 434             rules->buf_count,
 435             rules->buf_cur);
 436         for(i = 0; i < rules->token_cur; i++)
 437                 dump_token(rules, &rules->tokens[i]);
 438 }
 439 #else
 440 static inline const char *operation_str(enum operation_type type) { return NULL; }
 441 static inline const char *token_str(enum token_type type) { return NULL; }
 442 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 443 static inline void dump_rules(struct udev_rules *rules) {}
 444 #endif /* ENABLE_DEBUG */
 445
 446 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 447 {
 448         int off;
 449
 450         /* grow buffer if needed */
 451         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 452                 char *buf;
 453                 unsigned int add;
 454
 455                 /* double the buffer size */
 456                 add = rules->buf_max;
 457                 if (add < bytes * 8)
 458                         add = bytes * 8;
 459
 460                 buf = realloc(rules->buf, rules->buf_max + add);
 461                 if (buf == NULL)
 462                         return -1;
 463                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 464                 rules->buf = buf;
 465                 rules->buf_max += add;
 466         }
 467         off = rules->buf_cur;
 468         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 469         rules->buf_cur += bytes;
 470         rules->buf_count++;
 471         return off;
 472 }
 473
 474 static int add_string(struct udev_rules *rules, const char *str)
 475 {
 476         unsigned int node_idx;
 477         struct trie_node *new_node;
 478         unsigned int new_node_idx;
 479         unsigned char key;
 480         unsigned short len;
 481         unsigned int depth;
 482         unsigned int off;
 483         struct trie_node *parent;
 484
 485         /* walk trie, start from last character of str to find matching tails */
 486         len = strlen(str);
 487         key = str[len-1];
 488         node_idx = 0;
 489         for (depth = 0; depth <= len; depth++) {
 490                 struct trie_node *node;
 491                 unsigned int child_idx;
 492
 493                 node = &rules->trie_nodes[node_idx];
 494                 off = node->value_off + node->value_len - len;
 495
 496                 /* match against current node */
 497                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 498                         return off;
 499
 500                 /* lookup child node */
 501                 key = str[len - 1 - depth];
 502                 child_idx = node->child_idx;
 503                 while (child_idx > 0) {
 504                         struct trie_node *child;
 505
 506                         child = &rules->trie_nodes[child_idx];
 507                         if (child->key == key)
 508                                 break;
 509                         child_idx = child->next_child_idx;
 510                 }
 511                 if (child_idx == 0)
 512                         break;
 513                 node_idx = child_idx;
 514         }
 515
 516         /* string not found, add it */
 517         off = add_new_string(rules, str, len + 1);
 518
 519         /* grow trie nodes if needed */
 520         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 521                 struct trie_node *nodes;
 522                 unsigned int add;
 523
 524                 /* double the buffer size */
 525                 add = rules->trie_nodes_max;
 526                 if (add < 8)
 527                         add = 8;
 528
 529                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 530                 if (nodes == NULL)
 531                         return -1;
 532                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 533                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 534                 rules->trie_nodes = nodes;
 535                 rules->trie_nodes_max += add;
 536         }
 537
 538         /* get a new node */
 539         new_node_idx = rules->trie_nodes_cur;
 540         rules->trie_nodes_cur++;
 541         new_node = &rules->trie_nodes[new_node_idx];
 542         memset(new_node, 0x00, sizeof(struct trie_node));
 543         new_node->value_off = off;
 544         new_node->value_len = len;
 545         new_node->key = key;
 546
 547         /* join the parent's child list */
 548         parent = &rules->trie_nodes[node_idx];
 549         if (parent->child_idx == 0) {
 550                 parent->child_idx = new_node_idx;
 551         } else {
 552                 struct trie_node *last_child;
 553
 554                 last_child = &rules->trie_nodes[parent->last_child_idx];
 555                 last_child->next_child_idx = new_node_idx;
 556         }
 557         parent->last_child_idx = new_node_idx;
 558         return off;
 559 }
 560
 561 static int add_token(struct udev_rules *rules, struct token *token)
 562 {
 563         /* grow buffer if needed */
 564         if (rules->token_cur+1 >= rules->token_max) {
 565                 struct token *tokens;
 566                 unsigned int add;
 567
 568                 /* double the buffer size */
 569                 add = rules->token_max;
 570                 if (add < 8)
 571                         add = 8;
 572
 573                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 574                 if (tokens == NULL)
 575                         return -1;
 576                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 577                 rules->tokens = tokens;
 578                 rules->token_max += add;
 579         }
 580         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 581         rules->token_cur++;
 582         return 0;
 583 }
 584
 585 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 586 {
 587         unsigned int i;
 588         uid_t uid;
 589         unsigned int off;
 590
 591         /* lookup, if we know it already */
 592         for (i = 0; i < rules->uids_cur; i++) {
 593                 off = rules->uids[i].name_off;
 594                 if (strcmp(&rules->buf[off], owner) == 0) {
 595                         uid = rules->uids[i].uid;
 596                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 597                         return uid;
 598                 }
 599         }
 600         uid = util_lookup_user(rules->udev, owner);
 601
 602         /* grow buffer if needed */
 603         if (rules->uids_cur+1 >= rules->uids_max) {
 604                 struct uid_gid *uids;
 605                 unsigned int add;
 606
 607                 /* double the buffer size */
 608                 add = rules->uids_max;
 609                 if (add < 1)
 610                         add = 8;
 611
 612                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 613                 if (uids == NULL)
 614                         return uid;
 615                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 616                 rules->uids = uids;
 617                 rules->uids_max += add;
 618         }
 619         rules->uids[rules->uids_cur].uid = uid;
 620         off = add_string(rules, owner);
 621         if (off <= 0)
 622                 return uid;
 623         rules->uids[rules->uids_cur].name_off = off;
 624         rules->uids_cur++;
 625         return uid;
 626 }
 627
 628 static gid_t add_gid(struct udev_rules *rules, const char *group)
 629 {
 630         unsigned int i;
 631         gid_t gid;
 632         unsigned int off;
 633
 634         /* lookup, if we know it already */
 635         for (i = 0; i < rules->gids_cur; i++) {
 636                 off = rules->gids[i].name_off;
 637                 if (strcmp(&rules->buf[off], group) == 0) {
 638                         gid = rules->gids[i].gid;
 639                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 640                         return gid;
 641                 }
 642         }
 643         gid = util_lookup_group(rules->udev, group);
 644
 645         /* grow buffer if needed */
 646         if (rules->gids_cur+1 >= rules->gids_max) {
 647                 struct uid_gid *gids;
 648                 unsigned int add;
 649
 650                 /* double the buffer size */
 651                 add = rules->gids_max;
 652                 if (add < 1)
 653                         add = 8;
 654
 655                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 656                 if (gids == NULL)
 657                         return gid;
 658                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 659                 rules->gids = gids;
 660                 rules->gids_max += add;
 661         }
 662         rules->gids[rules->gids_cur].gid = gid;
 663         off = add_string(rules, group);
 664         if (off <= 0)
 665                 return gid;
 666         rules->gids[rules->gids_cur].name_off = off;
 667         rules->gids_cur++;
 668         return gid;
 669 }
 670
 671 static int import_property_from_string(struct udev_device *dev, char *line)
 672 {
 673         struct udev *udev = udev_device_get_udev(dev);
 674         char *key;
 675         char *val;
 676         size_t len;
 677
 678         /* find key */
 679         key = line;
 680         while (isspace(key[0]))
 681                 key++;
 682
 683         /* comment or empty line */
 684         if (key[0] == '#' || key[0] == '\0')
 685                 return -1;
 686
 687         /* split key/value */
 688         val = strchr(key, '=');
 689         if (val == NULL)
 690                 return -1;
 691         val[0] = '\0';
 692         val++;
 693
 694         /* find value */
 695         while (isspace(val[0]))
 696                 val++;
 697
 698         /* terminate key */
 699         len = strlen(key);
 700         if (len == 0)
 701                 return -1;
 702         while (isspace(key[len-1]))
 703                 len--;
 704         key[len] = '\0';
 705
 706         /* terminate value */
 707         len = strlen(val);
 708         if (len == 0)
 709                 return -1;
 710         while (isspace(val[len-1]))
 711                 len--;
 712         val[len] = '\0';
 713
 714         if (len == 0)
 715                 return -1;
 716
 717         /* unquote */
 718         if (val[0] == '"' || val[0] == '\'') {
 719                 if (val[len-1] != val[0]) {
 720                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 721                         return -1;
 722                 }
 723                 val[len-1] = '\0';
 724                 val++;
 725         }
 726
 727         dbg(udev, "adding '%s'='%s'\n", key, val);
 728
 729         /* handle device, renamed by external tool, returning new path */
 730         if (strcmp(key, "DEVPATH") == 0) {
 731                 char syspath[UTIL_PATH_SIZE];
 732
 733                 info(udev, "updating devpath from '%s' to '%s'\n",
 734                      udev_device_get_devpath(dev), val);
 735                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 736                 udev_device_set_syspath(dev, syspath);
 737         } else {
 738                 struct udev_list_entry *entry;
 739
 740                 entry = udev_device_add_property(dev, key, val);
 741                 /* store in db, skip private keys */
 742                 if (key[0] != '.')
 743                         udev_list_entry_set_num(entry, true);
 744         }
 745         return 0;
 746 }
 747
 748 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 749 {
 750         FILE *f;
 751         char line[UTIL_LINE_SIZE];
 752
 753         f = fopen(filename, "r");
 754         if (f == NULL)
 755                 return -1;
 756         while (fgets(line, sizeof(line), f) != NULL)
 757                 import_property_from_string(dev, line);
 758         fclose(f);
 759         return 0;
 760 }
 761
 762 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 763 {
 764         struct udev_device *dev = event->dev;
 765         char **envp;
 766         char result[UTIL_LINE_SIZE];
 767         char *line;
 768         int err;
 769
 770         envp = udev_device_get_properties_envp(dev);
 771         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 772         if (err < 0)
 773                 return err;
 774
 775         line = result;
 776         while (line != NULL) {
 777                 char *pos;
 778
 779                 pos = strchr(line, '\n');
 780                 if (pos != NULL) {
 781                         pos[0] = '\0';
 782                         pos = &pos[1];
 783                 }
 784                 import_property_from_string(dev, line);
 785                 line = pos;
 786         }
 787         return 0;
 788 }
 789
 790 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 791 {
 792         struct udev *udev = udev_device_get_udev(dev);
 793         struct udev_device *dev_parent;
 794         struct udev_list_entry *list_entry;
 795
 796         dev_parent = udev_device_get_parent(dev);
 797         if (dev_parent == NULL)
 798                 return -1;
 799
 800         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 801         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 802                 const char *key = udev_list_entry_get_name(list_entry);
 803                 const char *val = udev_list_entry_get_value(list_entry);
 804
 805                 if (fnmatch(filter, key, 0) == 0) {
 806                         struct udev_list_entry *entry;
 807
 808                         dbg(udev, "import key '%s=%s'\n", key, val);
 809                         entry = udev_device_add_property(dev, key, val);
 810                         /* store in db, skip private keys */
 811                         if (key[0] != '.')
 812                                 udev_list_entry_set_num(entry, true);
 813                 }
 814         }
 815         return 0;
 816 }
 817
 818 #define WAIT_LOOP_PER_SECOND            50
 819 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 820 {
 821         struct udev *udev = udev_device_get_udev(dev);
 822         char filepath[UTIL_PATH_SIZE];
 823         char devicepath[UTIL_PATH_SIZE];
 824         struct stat stats;
 825         int loop = timeout * WAIT_LOOP_PER_SECOND;
 826
 827         /* a relative path is a device attribute */
 828         devicepath[0] = '\0';
 829         if (file[0] != '/') {
 830                 util_strscpyl(devicepath, sizeof(devicepath),
 831                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 832                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 833                 file = filepath;
 834         }
 835
 836         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 837         while (--loop) {
 838                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 839
 840                 /* lookup file */
 841                 if (stat(file, &stats) == 0) {
 842                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 843                         return 0;
 844                 }
 845                 /* make sure, the device did not disappear in the meantime */
 846                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 847                         info(udev, "device disappeared while waiting for '%s'\n", file);
 848                         return -2;
 849                 }
 850                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 851                 nanosleep(&duration, NULL);
 852         }
 853         info(udev, "waiting for '%s' failed\n", file);
 854         return -1;
 855 }
 856
 857 static int attr_subst_subdir(char *attr, size_t len)
 858 {
 859         bool found = false;
 860
 861         if (strstr(attr, "/*/")) {
 862                 char *pos;
 863                 char dirname[UTIL_PATH_SIZE];
 864                 const char *tail;
 865                 DIR *dir;
 866
 867                 util_strscpy(dirname, sizeof(dirname), attr);
 868                 pos = strstr(dirname, "/*/");
 869                 if (pos == NULL)
 870                         return -1;
 871                 pos[0] = '\0';
 872                 tail = &pos[2];
 873                 dir = opendir(dirname);
 874                 if (dir != NULL) {
 875                         struct dirent *dent;
 876
 877                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 878                                 struct stat stats;
 879
 880                                 if (dent->d_name[0] == '.')
 881                                         continue;
 882                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 883                                 if (stat(attr, &stats) == 0) {
 884                                         found = true;
 885                                         break;
 886                                 }
 887                         }
 888                         closedir(dir);
 889                 }
 890         }
 891
 892         return found;
 893 }
 894
 895 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 896 {
 897         char *linepos;
 898         char *temp;
 899
 900         linepos = *line;
 901         if (linepos == NULL || linepos[0] == '\0')
 902                 return -1;
 903
 904         /* skip whitespace */
 905         while (isspace(linepos[0]) || linepos[0] == ',')
 906                 linepos++;
 907
 908         /* get the key */
 909         if (linepos[0] == '\0')
 910                 return -1;
 911         *key = linepos;
 912
 913         for (;;) {
 914                 linepos++;
 915                 if (linepos[0] == '\0')
 916                         return -1;
 917                 if (isspace(linepos[0]))
 918                         break;
 919                 if (linepos[0] == '=')
 920                         break;
 921                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 922                         if (linepos[1] == '=')
 923                                 break;
 924         }
 925
 926         /* remember end of key */
 927         temp = linepos;
 928
 929         /* skip whitespace after key */
 930         while (isspace(linepos[0]))
 931                 linepos++;
 932         if (linepos[0] == '\0')
 933                 return -1;
 934
 935         /* get operation type */
 936         if (linepos[0] == '=' && linepos[1] == '=') {
 937                 *op = OP_MATCH;
 938                 linepos += 2;
 939         } else if (linepos[0] == '!' && linepos[1] == '=') {
 940                 *op = OP_NOMATCH;
 941                 linepos += 2;
 942         } else if (linepos[0] == '+' && linepos[1] == '=') {
 943                 *op = OP_ADD;
 944                 linepos += 2;
 945         } else if (linepos[0] == '=') {
 946                 *op = OP_ASSIGN;
 947                 linepos++;
 948         } else if (linepos[0] == ':' && linepos[1] == '=') {
 949                 *op = OP_ASSIGN_FINAL;
 950                 linepos += 2;
 951         } else
 952                 return -1;
 953
 954         /* terminate key */
 955         temp[0] = '\0';
 956
 957         /* skip whitespace after operator */
 958         while (isspace(linepos[0]))
 959                 linepos++;
 960         if (linepos[0] == '\0')
 961                 return -1;
 962
 963         /* get the value */
 964         if (linepos[0] == '"')
 965                 linepos++;
 966         else
 967                 return -1;
 968         *value = linepos;
 969
 970         /* terminate */
 971         temp = strchr(linepos, '"');
 972         if (!temp)
 973                 return -1;
 974         temp[0] = '\0';
 975         temp++;
 976         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 977
 978         /* move line to next key */
 979         *line = temp;
 980         return 0;
 981 }
 982
 983 /* extract possible KEY{attr} */
 984 static char *get_key_attribute(struct udev *udev, char *str)
 985 {
 986         char *pos;
 987         char *attr;
 988
 989         attr = strchr(str, '{');
 990         if (attr != NULL) {
 991                 attr++;
 992                 pos = strchr(attr, '}');
 993                 if (pos == NULL) {
 994                         err(udev, "missing closing brace for format\n");
 995                         return NULL;
 996                 }
 997                 pos[0] = '\0';
 998                 dbg(udev, "attribute='%s'\n", attr);
 999                 return attr;
1000         }
1001         return NULL;
1002 }
1003
1004 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
1005                         enum operation_type op,
1006                         const char *value, const void *data)
1007 {
1008         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
1009         const char *attr = NULL;
1010
1011         memset(token, 0x00, sizeof(struct token));
1012
1013         switch (type) {
1014         case TK_M_ACTION:
1015         case TK_M_DEVPATH:
1016         case TK_M_KERNEL:
1017         case TK_M_SUBSYSTEM:
1018         case TK_M_DRIVER:
1019         case TK_M_WAITFOR:
1020         case TK_M_DEVLINK:
1021         case TK_M_NAME:
1022         case TK_M_KERNELS:
1023         case TK_M_SUBSYSTEMS:
1024         case TK_M_DRIVERS:
1025         case TK_M_TAGS:
1026         case TK_M_PROGRAM:
1027         case TK_M_IMPORT_FILE:
1028         case TK_M_IMPORT_PROG:
1029         case TK_M_IMPORT_DB:
1030         case TK_M_IMPORT_CMDLINE:
1031         case TK_M_IMPORT_PARENT:
1032         case TK_M_RESULT:
1033         case TK_A_OWNER:
1034         case TK_A_GROUP:
1035         case TK_A_MODE:
1036         case TK_A_NAME:
1037         case TK_A_GOTO:
1038         case TK_M_TAG:
1039         case TK_A_TAG:
1040                 token->key.value_off = add_string(rule_tmp->rules, value);
1041                 break;
1042         case TK_M_IMPORT_BUILTIN:
1043                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
1044                 break;
1045         case TK_M_ENV:
1046         case TK_M_ATTR:
1047         case TK_M_ATTRS:
1048         case TK_A_ATTR:
1049         case TK_A_ENV:
1050                 attr = data;
1051                 token->key.value_off = add_string(rule_tmp->rules, value);
1052                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1053                 break;
1054         case TK_A_DEVLINK:
1055                 token->key.value_off = add_string(rule_tmp->rules, value);
1056                 token->key.devlink_unique = *(int *)data;
1057                 break;
1058         case TK_M_TEST:
1059                 token->key.value_off = add_string(rule_tmp->rules, value);
1060                 if (data != NULL)
1061                         token->key.mode = *(mode_t *)data;
1062                 break;
1063         case TK_A_STRING_ESCAPE_NONE:
1064         case TK_A_STRING_ESCAPE_REPLACE:
1065         case TK_A_DB_PERSIST:
1066                 break;
1067         case TK_A_RUN:
1068                 token->key.value_off = add_string(rule_tmp->rules, value);
1069                 token->key.fail_on_error = *(int *)data;
1070                 break;
1071         case TK_A_INOTIFY_WATCH:
1072         case TK_A_DEVLINK_PRIO:
1073                 token->key.devlink_prio = *(int *)data;
1074                 break;
1075         case TK_A_OWNER_ID:
1076                 token->key.uid = *(uid_t *)data;
1077                 break;
1078         case TK_A_GROUP_ID:
1079                 token->key.gid = *(gid_t *)data;
1080                 break;
1081         case TK_A_MODE_ID:
1082                 token->key.mode = *(mode_t *)data;
1083                 break;
1084         case TK_A_STATIC_NODE:
1085                 token->key.value_off = add_string(rule_tmp->rules, value);
1086                 break;
1087         case TK_M_EVENT_TIMEOUT:
1088                 token->key.event_timeout = *(int *)data;
1089                 break;
1090         case TK_RULE:
1091         case TK_M_PARENTS_MIN:
1092         case TK_M_PARENTS_MAX:
1093         case TK_M_MAX:
1094         case TK_END:
1095         case TK_UNSET:
1096                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1097                 return -1;
1098         }
1099
1100         if (value != NULL && type < TK_M_MAX) {
1101                 /* check if we need to split or call fnmatch() while matching rules */
1102                 enum string_glob_type glob;
1103                 int has_split;
1104                 int has_glob;
1105
1106                 has_split = (strchr(value, '|') != NULL);
1107                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1108                 if (has_split && has_glob) {
1109                         glob = GL_SPLIT_GLOB;
1110                 } else if (has_split) {
1111                         glob = GL_SPLIT;
1112                 } else if (has_glob) {
1113                         if (strcmp(value, "?*") == 0)
1114                                 glob = GL_SOMETHING;
1115                         else
1116                                 glob = GL_GLOB;
1117                 } else {
1118                         glob = GL_PLAIN;
1119                 }
1120                 token->key.glob = glob;
1121         }
1122
1123         if (value != NULL && type > TK_M_MAX) {
1124                 /* check if assigned value has substitution chars */
1125                 if (value[0] == '[')
1126                         token->key.subst = SB_SUBSYS;
1127                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1128                         token->key.subst = SB_FORMAT;
1129                 else
1130                         token->key.subst = SB_NONE;
1131         }
1132
1133         if (attr != NULL) {
1134                 /* check if property/attribut name has substitution chars */
1135                 if (attr[0] == '[')
1136                         token->key.attrsubst = SB_SUBSYS;
1137                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1138                         token->key.attrsubst = SB_FORMAT;
1139                 else
1140                         token->key.attrsubst = SB_NONE;
1141         }
1142
1143         token->key.type = type;
1144         token->key.op = op;
1145         rule_tmp->token_cur++;
1146         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1147                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1148                 return -1;
1149         }
1150         return 0;
1151 }
1152
1153 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1154 {
1155         unsigned int i;
1156         unsigned int start = 0;
1157         unsigned int end = rule_tmp->token_cur;
1158
1159         for (i = 0; i < rule_tmp->token_cur; i++) {
1160                 enum token_type next_val = TK_UNSET;
1161                 unsigned int next_idx = 0;
1162                 unsigned int j;
1163
1164                 /* find smallest value */
1165                 for (j = start; j < end; j++) {
1166                         if (rule_tmp->token[j].type == TK_UNSET)
1167                                 continue;
1168                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1169                                 next_val = rule_tmp->token[j].type;
1170                                 next_idx = j;
1171                         }
1172                 }
1173
1174                 /* add token and mark done */
1175                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1176                         return -1;
1177                 rule_tmp->token[next_idx].type = TK_UNSET;
1178
1179                 /* shrink range */
1180                 if (next_idx == start)
1181                         start++;
1182                 if (next_idx+1 == end)
1183                         end--;
1184         }
1185         return 0;
1186 }
1187
1188 static int add_rule(struct udev_rules *rules, char *line,
1189                     const char *filename, unsigned int filename_off, unsigned int lineno)
1190 {
1191         char *linepos;
1192         char *attr;
1193         struct rule_tmp rule_tmp;
1194         bool bus_warn = false;
1195         bool sysfs_warn = false;
1196         bool id_warn = false;
1197
1198         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1199         rule_tmp.rules = rules;
1200         rule_tmp.rule.type = TK_RULE;
1201         rule_tmp.rule.rule.filename_off = filename_off;
1202         rule_tmp.rule.rule.filename_line = lineno;
1203
1204         linepos = line;
1205         for (;;) {
1206                 char *key;
1207                 char *value;
1208                 enum operation_type op;
1209
1210                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1211                         break;
1212
1213                 if (strcmp(key, "ACTION") == 0) {
1214                         if (op > OP_MATCH_MAX) {
1215                                 err(rules->udev, "invalid ACTION operation\n");
1216                                 goto invalid;
1217                         }
1218                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1219                         continue;
1220                 }
1221
1222                 if (strcmp(key, "DEVPATH") == 0) {
1223                         if (op > OP_MATCH_MAX) {
1224                                 err(rules->udev, "invalid DEVPATH operation\n");
1225                                 goto invalid;
1226                         }
1227                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1228                         continue;
1229                 }
1230
1231                 if (strcmp(key, "KERNEL") == 0) {
1232                         if (op > OP_MATCH_MAX) {
1233                                 err(rules->udev, "invalid KERNEL operation\n");
1234                                 goto invalid;
1235                         }
1236                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1237                         continue;
1238                 }
1239
1240                 if (strcmp(key, "SUBSYSTEM") == 0) {
1241                         if (op > OP_MATCH_MAX) {
1242                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1243                                 goto invalid;
1244                         }
1245                         /* bus, class, subsystem events should all be the same */
1246                         if (strcmp(value, "subsystem") == 0 ||
1247                             strcmp(value, "bus") == 0 ||
1248                             strcmp(value, "class") == 0) {
1249                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1250                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1251                                             "please fix it in %s:%u", value, filename, lineno);
1252                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1253                         } else
1254                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1255                         continue;
1256                 }
1257
1258                 if (strcmp(key, "DRIVER") == 0) {
1259                         if (op > OP_MATCH_MAX) {
1260                                 err(rules->udev, "invalid DRIVER operation\n");
1261                                 goto invalid;
1262                         }
1263                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1264                         continue;
1265                 }
1266
1267                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1268                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1269                         if (attr == NULL) {
1270                                 err(rules->udev, "error parsing ATTR attribute\n");
1271                                 goto invalid;
1272                         }
1273                         if (op < OP_MATCH_MAX) {
1274                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1275                         } else {
1276                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1277                         }
1278                         continue;
1279                 }
1280
1281                 if (strcmp(key, "KERNELS") == 0) {
1282                         if (op > OP_MATCH_MAX) {
1283                                 err(rules->udev, "invalid KERNELS operation\n");
1284                                 goto invalid;
1285                         }
1286                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1287                         continue;
1288                 }
1289
1290                 if (strcmp(key, "ID") == 0) {
1291                         if (!id_warn) {
1292                                 id_warn = true;
1293                                 err(rules->udev, "ID= will be removed in a future udev version, "
1294                                     "please use KERNEL= to match the event device, or KERNELS= "
1295                                     "to match a parent device, in %s:%u\n", filename, lineno);
1296                         }
1297                         if (op > OP_MATCH_MAX) {
1298                                 err(rules->udev, "invalid KERNELS operation\n");
1299                                 goto invalid;
1300                         }
1301                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1302                         continue;
1303                 }
1304
1305                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1306                         if (op > OP_MATCH_MAX) {
1307                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1308                                 goto invalid;
1309                         }
1310                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1311                         continue;
1312                 }
1313
1314                 if (strcmp(key, "BUS") == 0) {
1315                         if (!bus_warn) {
1316                                 bus_warn = true;
1317                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1318                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1319                                     "to match a parent device, in %s:%u\n", filename, lineno);
1320                         }
1321                         if (op > OP_MATCH_MAX) {
1322                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1323                                 goto invalid;
1324                         }
1325                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1326                         continue;
1327                 }
1328
1329                 if (strcmp(key, "DRIVERS") == 0) {
1330                         if (op > OP_MATCH_MAX) {
1331                                 err(rules->udev, "invalid DRIVERS operation\n");
1332                                 goto invalid;
1333                         }
1334                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1335                         continue;
1336                 }
1337
1338                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1339                         if (op > OP_MATCH_MAX) {
1340                                 err(rules->udev, "invalid ATTRS operation\n");
1341                                 goto invalid;
1342                         }
1343                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1344                         if (attr == NULL) {
1345                                 err(rules->udev, "error parsing ATTRS attribute\n");
1346                                 goto invalid;
1347                         }
1348                         if (strncmp(attr, "device/", 7) == 0)
1349                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1350                                     "please fix it in %s:%u", filename, lineno);
1351                         else if (strstr(attr, "../") != NULL)
1352                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1353                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1354                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1355                         continue;
1356                 }
1357
1358                 if (strcmp(key, "TAGS") == 0) {
1359                         if (op > OP_MATCH_MAX) {
1360                                 err(rules->udev, "invalid TAGS operation\n");
1361                                 goto invalid;
1362                         }
1363                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1364                         continue;
1365                 }
1366
1367                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1368                         if (!sysfs_warn) {
1369                                 sysfs_warn = true;
1370                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1371                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1372                                     "to match a parent device, in %s:%u\n", filename, lineno);
1373                         }
1374                         if (op > OP_MATCH_MAX) {
1375                                 err(rules->udev, "invalid ATTRS operation\n");
1376                                 goto invalid;
1377                         }
1378                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1379                         if (attr == NULL) {
1380                                 err(rules->udev, "error parsing ATTRS attribute\n");
1381                                 goto invalid;
1382                         }
1383                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1384                         continue;
1385                 }
1386
1387                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1388                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1389                         if (attr == NULL) {
1390                                 err(rules->udev, "error parsing ENV attribute\n");
1391                                 goto invalid;
1392                         }
1393                         if (op < OP_MATCH_MAX) {
1394                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1395                                         goto invalid;
1396                         } else {
1397                                 static const char *blacklist[] = {
1398                                         "ACTION",
1399                                         "SUBSYSTEM",
1400                                         "DEVTYPE",
1401                                         "MAJOR",
1402                                         "MINOR",
1403                                         "DRIVER",
1404                                         "IFINDEX",
1405                                         "DEVNAME",
1406                                         "DEVLINKS",
1407                                         "DEVPATH",
1408                                         "TAGS",
1409                                 };
1410                                 unsigned int i;
1411
1412                                 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1413                                         if (strcmp(attr, blacklist[i]) == 0) {
1414                                                 err(rules->udev, "invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1415                                                 continue;
1416                                         }
1417                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1418                                         goto invalid;
1419                         }
1420                         continue;
1421                 }
1422
1423                 if (strcmp(key, "TAG") == 0) {
1424                         if (op < OP_MATCH_MAX)
1425                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1426                         else
1427                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1428                         continue;
1429                 }
1430
1431                 if (strcmp(key, "PROGRAM") == 0) {
1432                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1433                         continue;
1434                 }
1435
1436                 if (strcmp(key, "RESULT") == 0) {
1437                         if (op > OP_MATCH_MAX) {
1438                                 err(rules->udev, "invalid RESULT operation\n");
1439                                 goto invalid;
1440                         }
1441                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1442                         continue;
1443                 }
1444
1445                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1446                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1447                         if (attr == NULL) {
1448                                 err(rules->udev, "IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1449                                 continue;
1450                         }
1451                         if (strstr(attr, "program")) {
1452                                 /* find known built-in command */
1453                                 if (value[0] != '/') {
1454                                         char file[UTIL_PATH_SIZE];
1455                                         char *pos;
1456                                         enum udev_builtin_cmd cmd;
1457
1458                                         util_strscpy(file, sizeof(file), value);
1459                                         pos = strchr(file, ' ');
1460                                         if (pos)
1461                                                 pos[0] = '\0';
1462                                         cmd = udev_builtin_lookup(file);
1463                                         if (cmd < UDEV_BUILTIN_MAX) {
1464                                                 info(rules->udev, "IMPORT found builtin '%s', replacing %s:%u\n", file, filename, lineno);
1465                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, NULL, &cmd);
1466                                                 continue;
1467                                         }
1468                                 }
1469                                 dbg(rules->udev, "IMPORT will be executed\n");
1470                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1471                         } else if (strstr(attr, "builtin")) {
1472                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1473
1474                                 dbg(rules->udev, "IMPORT execute builtin\n");
1475                                 if (cmd < UDEV_BUILTIN_MAX)
1476                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, NULL, &cmd);
1477                                 else
1478                                         err(rules->udev, "IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1479                         } else if (strstr(attr, "file")) {
1480                                 dbg(rules->udev, "IMPORT will be included as file\n");
1481                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1482                         } else if (strstr(attr, "db")) {
1483                                 dbg(rules->udev, "IMPORT will include db values\n");
1484                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1485                         } else if (strstr(attr, "cmdline")) {
1486                                 dbg(rules->udev, "IMPORT will include db values\n");
1487                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1488                         } else if (strstr(attr, "parent")) {
1489                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1490                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1491                         }
1492                         continue;
1493                 }
1494
1495                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1496                         mode_t mode = 0;
1497
1498                         if (op > OP_MATCH_MAX) {
1499                                 err(rules->udev, "invalid TEST operation\n");
1500                                 goto invalid;
1501                         }
1502                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1503                         if (attr != NULL) {
1504                                 mode = strtol(attr, NULL, 8);
1505                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1506                         } else {
1507                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1508                         }
1509                         continue;
1510                 }
1511
1512                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1513                         int flag = 0;
1514
1515                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1516                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1517                                 flag = 1;
1518                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1519                         continue;
1520                 }
1521
1522                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1523                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1524                         continue;
1525                 }
1526
1527                 if (strcmp(key, "LABEL") == 0) {
1528                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1529                         continue;
1530                 }
1531
1532                 if (strcmp(key, "GOTO") == 0) {
1533                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1534                         continue;
1535                 }
1536
1537                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1538                         if (op < OP_MATCH_MAX) {
1539                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1540                         } else {
1541                                 if (strcmp(value, "%k") == 0) {
1542                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1543                                             "please remove it from %s:%u\n", filename, lineno);
1544                                         continue;
1545                                 }
1546                                 if (value[0] == '\0') {
1547                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1548                                              "please remove it from %s:%u\n", filename, lineno);
1549                                         continue;
1550                                 }
1551                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1552                         }
1553                         rule_tmp.rule.rule.can_set_name = true;
1554                         continue;
1555                 }
1556
1557                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1558                         if (op < OP_MATCH_MAX) {
1559                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1560                         } else {
1561                                 int flag = 0;
1562
1563                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1564                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1565                                         flag = 1;
1566                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1567                         }
1568                         rule_tmp.rule.rule.can_set_name = true;
1569                         continue;
1570                 }
1571
1572                 if (strcmp(key, "OWNER") == 0) {
1573                         uid_t uid;
1574                         char *endptr;
1575
1576                         uid = strtoul(value, &endptr, 10);
1577                         if (endptr[0] == '\0') {
1578                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1579                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1580                                 uid = add_uid(rules, value);
1581                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1582                         } else if (rules->resolve_names >= 0) {
1583                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1584                         }
1585                         rule_tmp.rule.rule.can_set_name = true;
1586                         continue;
1587                 }
1588
1589                 if (strcmp(key, "GROUP") == 0) {
1590                         gid_t gid;
1591                         char *endptr;
1592
1593                         gid = strtoul(value, &endptr, 10);
1594                         if (endptr[0] == '\0') {
1595                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1596                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1597                                 gid = add_gid(rules, value);
1598                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1599                         } else if (rules->resolve_names >= 0) {
1600                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1601                         }
1602                         rule_tmp.rule.rule.can_set_name = true;
1603                         continue;
1604                 }
1605
1606                 if (strcmp(key, "MODE") == 0) {
1607                         mode_t mode;
1608                         char *endptr;
1609
1610                         mode = strtol(value, &endptr, 8);
1611                         if (endptr[0] == '\0')
1612                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1613                         else
1614                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1615                         rule_tmp.rule.rule.can_set_name = true;
1616                         continue;
1617                 }
1618
1619                 if (strcmp(key, "OPTIONS") == 0) {
1620                         const char *pos;
1621
1622                         pos = strstr(value, "link_priority=");
1623                         if (pos != NULL) {
1624                                 int prio = atoi(&pos[strlen("link_priority=")]);
1625
1626                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1627                                 dbg(rules->udev, "link priority=%i\n", prio);
1628                         }
1629
1630                         pos = strstr(value, "event_timeout=");
1631                         if (pos != NULL) {
1632                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1633
1634                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1635                                 dbg(rules->udev, "event timeout=%i\n", tout);
1636                         }
1637
1638                         pos = strstr(value, "string_escape=");
1639                         if (pos != NULL) {
1640                                 pos = &pos[strlen("string_escape=")];
1641                                 if (strncmp(pos, "none", strlen("none")) == 0)
1642                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1643                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1644                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1645                         }
1646
1647                         pos = strstr(value, "db_persist");
1648                         if (pos != NULL)
1649                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1650
1651                         pos = strstr(value, "nowatch");
1652                         if (pos != NULL) {
1653                                 const int off = 0;
1654
1655                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1656                                 dbg(rules->udev, "inotify watch of device disabled\n");
1657                         } else {
1658                                 pos = strstr(value, "watch");
1659                                 if (pos != NULL) {
1660                                         const int on = 1;
1661
1662                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1663                                         dbg(rules->udev, "inotify watch of device requested\n");
1664                                 }
1665                         }
1666
1667                         pos = strstr(value, "static_node=");
1668                         if (pos != NULL) {
1669                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1670                                 rule_tmp.rule.rule.has_static_node = true;
1671                         }
1672
1673                         continue;
1674                 }
1675                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1676         }
1677
1678         /* add rule token */
1679         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1680         if (add_token(rules, &rule_tmp.rule) != 0)
1681                 goto invalid;
1682
1683         /* add tokens to list, sorted by type */
1684         if (sort_token(rules, &rule_tmp) != 0)
1685                 goto invalid;
1686
1687         return 0;
1688 invalid:
1689         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1690         return -1;
1691 }
1692
1693 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1694 {
1695         FILE *f;
1696         unsigned int first_token;
1697         char line[UTIL_LINE_SIZE];
1698         int line_nr = 0;
1699         unsigned int i;
1700
1701         info(rules->udev, "reading '%s' as rules file\n", filename);
1702
1703         f = fopen(filename, "r");
1704         if (f == NULL)
1705                 return -1;
1706
1707         first_token = rules->token_cur;
1708
1709         while (fgets(line, sizeof(line), f) != NULL) {
1710                 char *key;
1711                 size_t len;
1712
1713                 /* skip whitespace */
1714                 line_nr++;
1715                 key = line;
1716                 while (isspace(key[0]))
1717                         key++;
1718
1719                 /* comment */
1720                 if (key[0] == '#')
1721                         continue;
1722
1723                 len = strlen(line);
1724                 if (len < 3)
1725                         continue;
1726
1727                 /* continue reading if backslash+newline is found */
1728                 while (line[len-2] == '\\') {
1729                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1730                                 break;
1731                         if (strlen(&line[len-2]) < 2)
1732                                 break;
1733                         line_nr++;
1734                         len = strlen(line);
1735                 }
1736
1737                 if (len+1 >= sizeof(line)) {
1738                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1739                         continue;
1740                 }
1741                 add_rule(rules, key, filename, filename_off, line_nr);
1742         }
1743         fclose(f);
1744
1745         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1746         for (i = first_token+1; i < rules->token_cur; i++) {
1747                 if (rules->tokens[i].type == TK_A_GOTO) {
1748                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1749                         unsigned int j;
1750
1751                         for (j = i+1; j < rules->token_cur; j++) {
1752                                 if (rules->tokens[j].type != TK_RULE)
1753                                         continue;
1754                                 if (rules->tokens[j].rule.label_off == 0)
1755                                         continue;
1756                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1757                                         continue;
1758                                 rules->tokens[i].key.rule_goto = j;
1759                                 break;
1760                         }
1761                         if (rules->tokens[i].key.rule_goto == 0)
1762                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1763                 }
1764         }
1765         return 0;
1766 }
1767
1768 static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
1769 {
1770         DIR *dir;
1771         struct dirent *dent;
1772         char filename[UTIL_PATH_SIZE];
1773
1774         dbg(udev, "open directory '%s'\n", dirname);
1775         dir = opendir(dirname);
1776         if (dir == NULL) {
1777                 info(udev, "unable to open '%s': %m\n", dirname);
1778                 return -1;
1779         }
1780
1781         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1782                 if (dent->d_name[0] == '.')
1783                         continue;
1784
1785                 /* look for file matching with specified suffix */
1786                 if (suffix != NULL) {
1787                         const char *ext;
1788
1789                         ext = strrchr(dent->d_name, '.');
1790                         if (ext == NULL)
1791                                 continue;
1792                         if (strcmp(ext, suffix) != 0)
1793                                 continue;
1794                 }
1795                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1796                 dbg(udev, "put file '%s' into list\n", filename);
1797                 /*
1798                  * the basename is the key, the filename the value
1799                  * identical basenames from different directories overwrite each other
1800                  * entries are sorted after basename
1801                  */
1802                 udev_list_entry_add(file_list, dent->d_name, filename);
1803         }
1804
1805         closedir(dir);
1806         return 0;
1807 }
1808
1809 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1810 {
1811         struct udev_rules *rules;
1812         struct udev_list file_list;
1813         struct udev_list_entry *file_loop;
1814         struct token end_token;
1815
1816         rules = calloc(1, sizeof(struct udev_rules));
1817         if (rules == NULL)
1818                 return NULL;
1819         rules->udev = udev;
1820         rules->resolve_names = resolve_names;
1821         udev_list_init(udev, &file_list, true);
1822
1823         /* init token array and string buffer */
1824         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1825         if (rules->tokens == NULL) {
1826                 free(rules);
1827                 return NULL;
1828         }
1829         rules->token_max = PREALLOC_TOKEN;
1830
1831         rules->buf = malloc(PREALLOC_STRBUF);
1832         if (rules->buf == NULL) {
1833                 free(rules->tokens);
1834                 free(rules);
1835                 return NULL;
1836         }
1837         rules->buf_max = PREALLOC_STRBUF;
1838         /* offset 0 is always '\0' */
1839         rules->buf[0] = '\0';
1840         rules->buf_cur = 1;
1841         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1842             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1843
1844         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1845         if (rules->trie_nodes == NULL) {
1846                 free(rules->buf);
1847                 free(rules->tokens);
1848                 free(rules);
1849                 return NULL;
1850         }
1851         rules->trie_nodes_max = PREALLOC_TRIE;
1852         /* offset 0 is the trie root, with an empty string */
1853         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1854         rules->trie_nodes_cur = 1;
1855
1856         if (udev_get_rules_path(udev) == NULL) {
1857                 char filename[UTIL_PATH_SIZE];
1858
1859                 /* /lib/udev -- default/package rules */
1860                 add_matching_files(udev, &file_list, LIBEXECDIR "/rules.d", ".rules");
1861
1862                 /* /etc/udev -- system-specific/user/admin rules */
1863                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1864
1865                 /* /run/udev -- throw-away/temporary rules */
1866                 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1867                 add_matching_files(udev, &file_list, filename, ".rules");
1868         } else {
1869                 /* custom rules files location for testing */
1870                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1871         }
1872
1873         /* add all filenames to the string buffer */
1874         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1875                 const char *filename = udev_list_entry_get_value(file_loop);
1876                 unsigned int filename_off;
1877
1878                 filename_off = add_string(rules, filename);
1879                 /* the offset in the rule is limited to unsigned short */
1880                 if (filename_off < USHRT_MAX)
1881                         udev_list_entry_set_num(file_loop, filename_off);
1882         }
1883
1884         /* parse all rules files */
1885         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1886                 const char *filename = udev_list_entry_get_value(file_loop);
1887                 unsigned int filename_off = udev_list_entry_get_num(file_loop);
1888                 struct stat st;
1889
1890                 if (stat(filename, &st) != 0) {
1891                         err(udev, "can not find '%s': %m\n", filename);
1892                         continue;
1893                 }
1894                 if (S_ISREG(st.st_mode) && st.st_size <= 0) {
1895                         info(udev, "ignore empty '%s'\n", filename);
1896                         continue;
1897                 }
1898                 if (S_ISCHR(st.st_mode)) {
1899                         info(udev, "ignore masked '%s'\n", filename);
1900                         continue;
1901                 }
1902                 parse_file(rules, filename, filename_off);
1903         }
1904         udev_list_cleanup(&file_list);
1905
1906         memset(&end_token, 0x00, sizeof(struct token));
1907         end_token.type = TK_END;
1908         add_token(rules, &end_token);
1909
1910         /* shrink allocated token and string buffer */
1911         if (rules->token_cur < rules->token_max) {
1912                 struct token *tokens;
1913
1914                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1915                 if (tokens != NULL || rules->token_cur == 0) {
1916                         rules->tokens = tokens;
1917                         rules->token_max = rules->token_cur;
1918                 }
1919         }
1920         if (rules->buf_cur < rules->buf_max) {
1921                 char *buf;
1922
1923                 buf = realloc(rules->buf, rules->buf_cur);
1924                 if (buf != NULL || rules->buf_cur == 0) {
1925                         rules->buf = buf;
1926                         rules->buf_max = rules->buf_cur;
1927                 }
1928         }
1929         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1930              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1931         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1932              rules->trie_nodes_cur * sizeof(struct trie_node),
1933              rules->trie_nodes_cur, sizeof(struct trie_node));
1934
1935         /* cleanup trie */
1936         free(rules->trie_nodes);
1937         rules->trie_nodes = NULL;
1938         rules->trie_nodes_cur = 0;
1939         rules->trie_nodes_max = 0;
1940
1941         /* cleanup uid/gid cache */
1942         free(rules->uids);
1943         rules->uids = NULL;
1944         rules->uids_cur = 0;
1945         rules->uids_max = 0;
1946         free(rules->gids);
1947         rules->gids = NULL;
1948         rules->gids_cur = 0;
1949         rules->gids_max = 0;
1950
1951         dump_rules(rules);
1952         return rules;
1953 }
1954
1955 void udev_rules_unref(struct udev_rules *rules)
1956 {
1957         if (rules == NULL)
1958                 return;
1959         free(rules->tokens);
1960         free(rules->buf);
1961         free(rules->trie_nodes);
1962         free(rules->uids);
1963         free(rules->gids);
1964         free(rules);
1965 }
1966
1967 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1968 {
1969         char *key_value = &rules->buf[token->key.value_off];
1970         char *pos;
1971         bool match = false;
1972
1973         if (val == NULL)
1974                 val = "";
1975
1976         switch (token->key.glob) {
1977         case GL_PLAIN:
1978                 match = (strcmp(key_value, val) == 0);
1979                 break;
1980         case GL_GLOB:
1981                 match = (fnmatch(key_value, val, 0) == 0);
1982                 break;
1983         case GL_SPLIT:
1984                 {
1985                         const char *split;
1986                         size_t len;
1987
1988                         split = &rules->buf[token->key.value_off];
1989                         len = strlen(val);
1990                         for (;;) {
1991                                 const char *next;
1992
1993                                 next = strchr(split, '|');
1994                                 if (next != NULL) {
1995                                         size_t matchlen = (size_t)(next - split);
1996
1997                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1998                                         if (match)
1999                                                 break;
2000                                 } else {
2001                                         match = (strcmp(split, val) == 0);
2002                                         break;
2003                                 }
2004                                 split = &next[1];
2005                         }
2006                         break;
2007                 }
2008         case GL_SPLIT_GLOB:
2009                 {
2010                         char value[UTIL_PATH_SIZE];
2011
2012                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
2013                         key_value = value;
2014                         while (key_value != NULL) {
2015                                 pos = strchr(key_value, '|');
2016                                 if (pos != NULL) {
2017                                         pos[0] = '\0';
2018                                         pos = &pos[1];
2019                                 }
2020                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
2021                                 match = (fnmatch(key_value, val, 0) == 0);
2022                                 if (match)
2023                                         break;
2024                                 key_value = pos;
2025                         }
2026                         break;
2027                 }
2028         case GL_SOMETHING:
2029                 match = (val[0] != '\0');
2030                 break;
2031         case GL_UNSET:
2032                 return -1;
2033         }
2034
2035         if (match && (token->key.op == OP_MATCH)) {
2036                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
2037                 return 0;
2038         }
2039         if (!match && (token->key.op == OP_NOMATCH)) {
2040                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
2041                 return 0;
2042         }
2043         dbg(rules->udev, "%s is not true\n", token_str(token->type));
2044         return -1;
2045 }
2046
2047 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
2048 {
2049         const char *name;
2050         char nbuf[UTIL_NAME_SIZE];
2051         const char *value;
2052         char vbuf[UTIL_NAME_SIZE];
2053         size_t len;
2054
2055         name = &rules->buf[cur->key.attr_off];
2056         switch (cur->key.attrsubst) {
2057         case SB_FORMAT:
2058                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2059                 name = nbuf;
2060                 /* fall through */
2061         case SB_NONE:
2062                 value = udev_device_get_sysattr_value(dev, name);
2063                 if (value == NULL)
2064                         return -1;
2065                 break;
2066         case SB_SUBSYS:
2067                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2068                         return -1;
2069                 value = vbuf;
2070                 break;
2071         default:
2072                 return -1;
2073         }
2074
2075         /* remove trailing whitespace, if not asked to match for it */
2076         len = strlen(value);
2077         if (len > 0 && isspace(value[len-1])) {
2078                 const char *key_value;
2079                 size_t klen;
2080
2081                 key_value = &rules->buf[cur->key.value_off];
2082                 klen = strlen(key_value);
2083                 if (klen > 0 && !isspace(key_value[klen-1])) {
2084                         if (value != vbuf) {
2085                                 util_strscpy(vbuf, sizeof(vbuf), value);
2086                                 value = vbuf;
2087                         }
2088                         while (len > 0 && isspace(vbuf[--len]))
2089                                 vbuf[len] = '\0';
2090                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2091                 }
2092         }
2093
2094         return match_key(rules, cur, value);
2095 }
2096
2097 enum escape_type {
2098         ESCAPE_UNSET,
2099         ESCAPE_NONE,
2100         ESCAPE_REPLACE,
2101 };
2102
2103 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
2104 {
2105         struct token *cur;
2106         struct token *rule;
2107         enum escape_type esc = ESCAPE_UNSET;
2108         bool can_set_name;
2109
2110         if (rules->tokens == NULL)
2111                 return -1;
2112
2113         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2114                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2115                          udev_device_get_ifindex(event->dev) > 0));
2116
2117         /* loop through token list, match, run actions or forward to next rule */
2118         cur = &rules->tokens[0];
2119         rule = cur;
2120         for (;;) {
2121                 dump_token(rules, cur);
2122                 switch (cur->type) {
2123                 case TK_RULE:
2124                         /* current rule */
2125                         rule = cur;
2126                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2127                         if (!can_set_name && rule->rule.can_set_name)
2128                                 goto nomatch;
2129                         esc = ESCAPE_UNSET;
2130                         break;
2131                 case TK_M_ACTION:
2132                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2133                                 goto nomatch;
2134                         break;
2135                 case TK_M_DEVPATH:
2136                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2137                                 goto nomatch;
2138                         break;
2139                 case TK_M_KERNEL:
2140                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2141                                 goto nomatch;
2142                         break;
2143                 case TK_M_DEVLINK: {
2144                         size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2145                         struct udev_list_entry *list_entry;
2146                         bool match = false;
2147
2148                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2149                                 const char *devlink;
2150
2151                                 devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2152                                 if (match_key(rules, cur, devlink) == 0) {
2153                                         match = true;
2154                                         break;
2155                                 }
2156                         }
2157                         if (!match)
2158                                 goto nomatch;
2159                         break;
2160                 }
2161                 case TK_M_NAME:
2162                         if (match_key(rules, cur, event->name) != 0)
2163                                 goto nomatch;
2164                         break;
2165                 case TK_M_ENV: {
2166                         const char *key_name = &rules->buf[cur->key.attr_off];
2167                         const char *value;
2168
2169                         value = udev_device_get_property_value(event->dev, key_name);
2170                         if (value == NULL) {
2171                                 dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2172                                 value = "";
2173                         }
2174                         if (match_key(rules, cur, value))
2175                                 goto nomatch;
2176                         break;
2177                 }
2178                 case TK_M_TAG: {
2179                         struct udev_list_entry *list_entry;
2180                         bool match = false;
2181
2182                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2183                                 if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2184                                         match = true;
2185                                         break;
2186                                 }
2187                         }
2188                         if (!match && (cur->key.op != OP_NOMATCH))
2189                                 goto nomatch;
2190                         break;
2191                 }
2192                 case TK_M_SUBSYSTEM:
2193                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2194                                 goto nomatch;
2195                         break;
2196                 case TK_M_DRIVER:
2197                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2198                                 goto nomatch;
2199                         break;
2200                 case TK_M_WAITFOR: {
2201                         char filename[UTIL_PATH_SIZE];
2202                         int found;
2203
2204                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2205                         found = (wait_for_file(event->dev, filename, 10) == 0);
2206                         if (!found && (cur->key.op != OP_NOMATCH))
2207                                 goto nomatch;
2208                         break;
2209                 }
2210                 case TK_M_ATTR:
2211                         if (match_attr(rules, event->dev, event, cur) != 0)
2212                                 goto nomatch;
2213                         break;
2214                 case TK_M_KERNELS:
2215                 case TK_M_SUBSYSTEMS:
2216                 case TK_M_DRIVERS:
2217                 case TK_M_ATTRS:
2218                 case TK_M_TAGS: {
2219                         struct token *next;
2220
2221                         /* get whole sequence of parent matches */
2222                         next = cur;
2223                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2224                                 next++;
2225
2226                         /* loop over parents */
2227                         event->dev_parent = event->dev;
2228                         for (;;) {
2229                                 struct token *key;
2230
2231                                 dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2232                                 /* loop over sequence of parent match keys */
2233                                 for (key = cur; key < next; key++ ) {
2234                                         dump_token(rules, key);
2235                                         switch(key->type) {
2236                                         case TK_M_KERNELS:
2237                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2238                                                         goto try_parent;
2239                                                 break;
2240                                         case TK_M_SUBSYSTEMS:
2241                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2242                                                         goto try_parent;
2243                                                 break;
2244                                         case TK_M_DRIVERS:
2245                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2246                                                         goto try_parent;
2247                                                 break;
2248                                         case TK_M_ATTRS:
2249                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2250                                                         goto try_parent;
2251                                                 break;
2252                                         case TK_M_TAGS: {
2253                                                 bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
2254
2255                                                 if (match && key->key.op == OP_NOMATCH)
2256                                                         goto try_parent;
2257                                                 if (!match && key->key.op == OP_MATCH)
2258                                                         goto try_parent;
2259                                                 break;
2260                                         }
2261                                         default:
2262                                                 goto nomatch;
2263                                         }
2264                                         dbg(event->udev, "parent key matched\n");
2265                                 }
2266                                 dbg(event->udev, "all parent keys matched\n");
2267                                 break;
2268
2269                         try_parent:
2270                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2271                                 if (event->dev_parent == NULL)
2272                                         goto nomatch;
2273                         }
2274                         /* move behind our sequence of parent match keys */
2275                         cur = next;
2276                         continue;
2277                 }
2278                 case TK_M_TEST: {
2279                         char filename[UTIL_PATH_SIZE];
2280                         struct stat statbuf;
2281                         int match;
2282
2283                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2284                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2285                                 if (filename[0] != '/') {
2286                                         char tmp[UTIL_PATH_SIZE];
2287
2288                                         util_strscpy(tmp, sizeof(tmp), filename);
2289                                         util_strscpyl(filename, sizeof(filename),
2290                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2291                                 }
2292                         }
2293                         attr_subst_subdir(filename, sizeof(filename));
2294
2295                         match = (stat(filename, &statbuf) == 0);
2296                         dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2297                         if (match && cur->key.mode > 0) {
2298                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2299                                 dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2300                                     match ? "matches" : "does not match", cur->key.mode);
2301                         }
2302                         if (match && cur->key.op == OP_NOMATCH)
2303                                 goto nomatch;
2304                         if (!match && cur->key.op == OP_MATCH)
2305                                 goto nomatch;
2306                         break;
2307                 }
2308                 case TK_M_EVENT_TIMEOUT:
2309                         info(event->udev, "OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2310                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2311                         break;
2312                 case TK_M_PROGRAM: {
2313                         char program[UTIL_PATH_SIZE];
2314                         char **envp;
2315                         char result[UTIL_PATH_SIZE];
2316
2317                         free(event->program_result);
2318                         event->program_result = NULL;
2319                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2320                         envp = udev_device_get_properties_envp(event->dev);
2321                         info(event->udev, "PROGRAM '%s' %s:%u\n",
2322                              program,
2323                              &rules->buf[rule->rule.filename_off],
2324                              rule->rule.filename_line);
2325
2326                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2327                                 if (cur->key.op != OP_NOMATCH)
2328                                         goto nomatch;
2329                         } else {
2330                                 int count;
2331
2332                                 util_remove_trailing_chars(result, '\n');
2333                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2334                                         count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2335                                         if (count > 0)
2336                                                 info(event->udev, "%i character(s) replaced\n" , count);
2337                                 }
2338                                 event->program_result = strdup(result);
2339                                 dbg(event->udev, "storing result '%s'\n", event->program_result);
2340                                 if (cur->key.op == OP_NOMATCH)
2341                                         goto nomatch;
2342                         }
2343                         break;
2344                 }
2345                 case TK_M_IMPORT_FILE: {
2346                         char import[UTIL_PATH_SIZE];
2347
2348                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2349                         if (import_file_into_properties(event->dev, import) != 0)
2350                                 if (cur->key.op != OP_NOMATCH)
2351                                         goto nomatch;
2352                         break;
2353                 }
2354                 case TK_M_IMPORT_PROG: {
2355                         char import[UTIL_PATH_SIZE];
2356
2357                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2358                         info(event->udev, "IMPORT '%s' %s:%u\n",
2359                              import,
2360                              &rules->buf[rule->rule.filename_off],
2361                              rule->rule.filename_line);
2362
2363                         if (import_program_into_properties(event, import, sigmask) != 0)
2364                                 if (cur->key.op != OP_NOMATCH)
2365                                         goto nomatch;
2366                         break;
2367                 }
2368                 case TK_M_IMPORT_BUILTIN: {
2369                         /* check if we ran already */
2370                         if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2371                                 info(event->udev, "IMPORT builtin skip '%s' %s:%u\n",
2372                                      udev_builtin_name(cur->key.builtin_cmd),
2373                                      &rules->buf[rule->rule.filename_off],
2374                                      rule->rule.filename_line);
2375                                 /* return the result from earlier run */
2376                                 if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2377                                         if (cur->key.op != OP_NOMATCH)
2378                                                 goto nomatch;
2379                                 break;
2380                         }
2381                         /* mark as ran */
2382                         event->builtin_run |= (1 << cur->key.builtin_cmd);
2383                         info(event->udev, "IMPORT builtin '%s' %s:%u\n",
2384                              udev_builtin_name(cur->key.builtin_cmd),
2385                              &rules->buf[rule->rule.filename_off],
2386                              rule->rule.filename_line);
2387                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, false) != 0) {
2388                                 /* remember failure */
2389                                 info(rules->udev, "IMPORT builtin '%s' returned non-zero\n",
2390                                      udev_builtin_name(cur->key.builtin_cmd));
2391                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2392                                 if (cur->key.op != OP_NOMATCH)
2393                                         goto nomatch;
2394                         }
2395                         break;
2396                 }
2397                 case TK_M_IMPORT_DB: {
2398                         const char *key = &rules->buf[cur->key.value_off];
2399                         const char *value;
2400
2401                         value = udev_device_get_property_value(event->dev_db, key);
2402                         if (value != NULL) {
2403                                 struct udev_list_entry *entry;
2404
2405                                 entry = udev_device_add_property(event->dev, key, value);
2406                                 udev_list_entry_set_num(entry, true);
2407                         } else {
2408                                 if (cur->key.op != OP_NOMATCH)
2409                                         goto nomatch;
2410                         }
2411                         break;
2412                 }
2413                 case TK_M_IMPORT_CMDLINE: {
2414                         FILE *f;
2415                         bool imported = false;
2416
2417                         f = fopen("/proc/cmdline", "r");
2418                         if (f != NULL) {
2419                                 char cmdline[4096];
2420
2421                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2422                                         const char *key = &rules->buf[cur->key.value_off];
2423                                         char *pos;
2424
2425                                         pos = strstr(cmdline, key);
2426                                         if (pos != NULL) {
2427                                                 struct udev_list_entry *entry;
2428
2429                                                 pos += strlen(key);
2430                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2431                                                         /* we import simple flags as 'FLAG=1' */
2432                                                         entry = udev_device_add_property(event->dev, key, "1");
2433                                                         udev_list_entry_set_num(entry, true);
2434                                                         imported = true;
2435                                                 } else if (pos[0] == '=') {
2436                                                         const char *value;
2437
2438                                                         pos++;
2439                                                         value = pos;
2440                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2441                                                                 pos++;
2442                                                         pos[0] = '\0';
2443                                                         entry = udev_device_add_property(event->dev, key, value);
2444                                                         udev_list_entry_set_num(entry, true);
2445                                                         imported = true;
2446                                                 }
2447                                         }
2448                                 }
2449                                 fclose(f);
2450                         }
2451                         if (!imported && cur->key.op != OP_NOMATCH)
2452                                 goto nomatch;
2453                         break;
2454                 }
2455                 case TK_M_IMPORT_PARENT: {
2456                         char import[UTIL_PATH_SIZE];
2457
2458                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2459                         if (import_parent_into_properties(event->dev, import) != 0)
2460                                 if (cur->key.op != OP_NOMATCH)
2461                                         goto nomatch;
2462                         break;
2463                 }
2464                 case TK_M_RESULT:
2465                         if (match_key(rules, cur, event->program_result) != 0)
2466                                 goto nomatch;
2467                         break;
2468                 case TK_A_STRING_ESCAPE_NONE:
2469                         esc = ESCAPE_NONE;
2470                         break;
2471                 case TK_A_STRING_ESCAPE_REPLACE:
2472                         esc = ESCAPE_REPLACE;
2473                         break;
2474                 case TK_A_DB_PERSIST:
2475                         udev_device_set_db_persist(event->dev);
2476                         break;
2477                 case TK_A_INOTIFY_WATCH:
2478                         if (event->inotify_watch_final)
2479                                 break;
2480                         if (cur->key.op == OP_ASSIGN_FINAL)
2481                                 event->inotify_watch_final = true;
2482                         event->inotify_watch = cur->key.watch;
2483                         break;
2484                 case TK_A_DEVLINK_PRIO:
2485                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2486                         break;
2487                 case TK_A_OWNER: {
2488                         char owner[UTIL_NAME_SIZE];
2489
2490                         if (event->owner_final)
2491                                 break;
2492                         if (cur->key.op == OP_ASSIGN_FINAL)
2493                                 event->owner_final = true;
2494                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2495                         event->uid = util_lookup_user(event->udev, owner);
2496                         info(event->udev, "OWNER %u %s:%u\n",
2497                              event->uid,
2498                              &rules->buf[rule->rule.filename_off],
2499                              rule->rule.filename_line);
2500                         break;
2501                 }
2502                 case TK_A_GROUP: {
2503                         char group[UTIL_NAME_SIZE];
2504
2505                         if (event->group_final)
2506                                 break;
2507                         if (cur->key.op == OP_ASSIGN_FINAL)
2508                                 event->group_final = true;
2509                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2510                         event->gid = util_lookup_group(event->udev, group);
2511                         info(event->udev, "GROUP %u %s:%u\n",
2512                              event->gid,
2513                              &rules->buf[rule->rule.filename_off],
2514                              rule->rule.filename_line);
2515                         break;
2516                 }
2517                 case TK_A_MODE: {
2518                         char mode_str[UTIL_NAME_SIZE];
2519                         mode_t mode;
2520                         char *endptr;
2521
2522                         if (event->mode_final)
2523                                 break;
2524                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode_str, sizeof(mode_str));
2525                         mode = strtol(mode_str, &endptr, 8);
2526                         if (endptr[0] != '\0') {
2527                                 err(event->udev, "ignoring invalid mode '%s'\n", mode_str);
2528                                 break;
2529                         }
2530                         if (cur->key.op == OP_ASSIGN_FINAL)
2531                                 event->mode_final = true;
2532                         event->mode_set = true;
2533                         event->mode = mode;
2534                         info(event->udev, "MODE %#o %s:%u\n",
2535                              event->mode,
2536                              &rules->buf[rule->rule.filename_off],
2537                              rule->rule.filename_line);
2538                         break;
2539                 }
2540                 case TK_A_OWNER_ID:
2541                         if (event->owner_final)
2542                                 break;
2543                         if (cur->key.op == OP_ASSIGN_FINAL)
2544                                 event->owner_final = true;
2545                         event->uid = cur->key.uid;
2546                         info(event->udev, "OWNER %u %s:%u\n",
2547                              event->uid,
2548                              &rules->buf[rule->rule.filename_off],
2549                              rule->rule.filename_line);
2550                         break;
2551                 case TK_A_GROUP_ID:
2552                         if (event->group_final)
2553                                 break;
2554                         if (cur->key.op == OP_ASSIGN_FINAL)
2555                                 event->group_final = true;
2556                         event->gid = cur->key.gid;
2557                         info(event->udev, "GROUP %u %s:%u\n",
2558                              event->gid,
2559                              &rules->buf[rule->rule.filename_off],
2560                              rule->rule.filename_line);
2561                         break;
2562                 case TK_A_MODE_ID:
2563                         if (event->mode_final)
2564                                 break;
2565                         if (cur->key.op == OP_ASSIGN_FINAL)
2566                                 event->mode_final = true;
2567                         event->mode_set = true;
2568                         event->mode = cur->key.mode;
2569                         info(event->udev, "MODE %#o %s:%u\n",
2570                              event->mode,
2571                              &rules->buf[rule->rule.filename_off],
2572                              rule->rule.filename_line);
2573                         break;
2574                 case TK_A_STATIC_NODE:
2575                         break;
2576                 case TK_A_ENV: {
2577                         const char *name = &rules->buf[cur->key.attr_off];
2578                         char *value = &rules->buf[cur->key.value_off];
2579
2580                         if (value[0] != '\0') {
2581                                 char temp_value[UTIL_NAME_SIZE];
2582                                 struct udev_list_entry *entry;
2583
2584                                 udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2585                                 entry = udev_device_add_property(event->dev, name, temp_value);
2586                                 /* store in db, skip private keys */
2587                                 if (name[0] != '.')
2588                                         udev_list_entry_set_num(entry, true);
2589                         } else {
2590                                 udev_device_add_property(event->dev, name, NULL);
2591                         }
2592                         break;
2593                 }
2594                 case TK_A_TAG: {
2595                         char tag[UTIL_PATH_SIZE];
2596                         const char *p;
2597
2598                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
2599                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2600                                 udev_device_cleanup_tags_list(event->dev);
2601                         for (p = tag; *p != '\0'; p++) {
2602                                 if ((*p >= 'a' && *p <= 'z') ||
2603                                     (*p >= 'A' && *p <= 'Z') ||
2604                                     (*p >= '0' && *p <= '9') ||
2605                                     *p == '-' || *p == '_')
2606                                         continue;
2607                                 err(event->udev, "ignoring invalid tag name '%s'\n", tag);
2608                                 break;
2609                         }
2610                         udev_device_add_tag(event->dev, tag);
2611                         break;
2612                 }
2613                 case TK_A_NAME: {
2614                         const char *name  = &rules->buf[cur->key.value_off];
2615                         char name_str[UTIL_PATH_SIZE];
2616                         int count;
2617
2618                         if (event->name_final)
2619                                 break;
2620                         if (cur->key.op == OP_ASSIGN_FINAL)
2621                                 event->name_final = true;
2622                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2623                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2624                                 count = udev_util_replace_chars(name_str, "/");
2625                                 if (count > 0)
2626                                         info(event->udev, "%i character(s) replaced\n", count);
2627                         }
2628                         free(event->name);
2629                         event->name = strdup(name_str);
2630                         info(event->udev, "NAME '%s' %s:%u\n",
2631                              event->name,
2632                              &rules->buf[rule->rule.filename_off],
2633                              rule->rule.filename_line);
2634                         break;
2635                 }
2636                 case TK_A_DEVLINK: {
2637                         char temp[UTIL_PATH_SIZE];
2638                         char filename[UTIL_PATH_SIZE];
2639                         char *pos, *next;
2640                         int count = 0;
2641
2642                         if (event->devlink_final)
2643                                 break;
2644                         if (major(udev_device_get_devnum(event->dev)) == 0)
2645                                 break;
2646                         if (cur->key.op == OP_ASSIGN_FINAL)
2647                                 event->devlink_final = true;
2648                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2649                                 udev_device_cleanup_devlinks_list(event->dev);
2650
2651                         /* allow  multiple symlinks separated by spaces */
2652                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2653                         if (esc == ESCAPE_UNSET)
2654                                 count = udev_util_replace_chars(temp, "/ ");
2655                         else if (esc == ESCAPE_REPLACE)
2656                                 count = udev_util_replace_chars(temp, "/");
2657                         if (count > 0)
2658                                 info(event->udev, "%i character(s) replaced\n" , count);
2659                         dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2660                         pos = temp;
2661                         while (isspace(pos[0]))
2662                                 pos++;
2663                         next = strchr(pos, ' ');
2664                         while (next != NULL) {
2665                                 next[0] = '\0';
2666                                 info(event->udev, "LINK '%s' %s:%u\n", pos,
2667                                      &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2668                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2669                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2670                                 while (isspace(next[1]))
2671                                         next++;
2672                                 pos = &next[1];
2673                                 next = strchr(pos, ' ');
2674                         }
2675                         if (pos[0] != '\0') {
2676                                 info(event->udev, "LINK '%s' %s:%u\n", pos,
2677                                      &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2678                                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2679                                 udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2680                         }
2681                         break;
2682                 }
2683                 case TK_A_ATTR: {
2684                         const char *key_name = &rules->buf[cur->key.attr_off];
2685                         char attr[UTIL_PATH_SIZE];
2686                         char value[UTIL_NAME_SIZE];
2687                         FILE *f;
2688
2689                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2690                                 util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2691                         attr_subst_subdir(attr, sizeof(attr));
2692
2693                         udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2694                         info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2695                              &rules->buf[rule->rule.filename_off],
2696                              rule->rule.filename_line);
2697                         f = fopen(attr, "w");
2698                         if (f != NULL) {
2699                                 if (fprintf(f, "%s", value) <= 0)
2700                                         err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2701                                 fclose(f);
2702                         } else {
2703                                 err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2704                         }
2705                         break;
2706                 }
2707                 case TK_A_RUN: {
2708                         struct udev_list_entry *list_entry;
2709
2710                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2711                                 udev_list_cleanup(&event->run_list);
2712                         info(event->udev, "RUN '%s' %s:%u\n",
2713                              &rules->buf[cur->key.value_off],
2714                              &rules->buf[rule->rule.filename_off],
2715                              rule->rule.filename_line);
2716                         list_entry = udev_list_entry_add(&event->run_list, &rules->buf[cur->key.value_off], NULL);
2717                         if (cur->key.fail_on_error)
2718                                 udev_list_entry_set_num(list_entry, true);
2719                         break;
2720                 }
2721                 case TK_A_GOTO:
2722                         if (cur->key.rule_goto == 0)
2723                                 break;
2724                         cur = &rules->tokens[cur->key.rule_goto];
2725                         continue;
2726                 case TK_END:
2727                         return 0;
2728
2729                 case TK_M_PARENTS_MIN:
2730                 case TK_M_PARENTS_MAX:
2731                 case TK_M_MAX:
2732                 case TK_UNSET:
2733                         err(rules->udev, "wrong type %u\n", cur->type);
2734                         goto nomatch;
2735                 }
2736
2737                 cur++;
2738                 continue;
2739         nomatch:
2740                 /* fast-forward to next rule */
2741                 cur = rule + rule->rule.token_count;
2742                 dbg(rules->udev, "forward to rule: %u\n",
2743                                  (unsigned int) (cur - rules->tokens));
2744         }
2745 }
2746
2747 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2748 {
2749         struct token *cur;
2750         struct token *rule;
2751         uid_t uid = 0;
2752         gid_t gid = 0;
2753         mode_t mode = 0;
2754
2755         if (rules->tokens == NULL)
2756                 return;
2757
2758         cur = &rules->tokens[0];
2759         rule = cur;
2760         for (;;) {
2761                 switch (cur->type) {
2762                 case TK_RULE:
2763                         /* current rule */
2764                         rule = cur;
2765
2766                         /* skip rules without a static_node tag */
2767                         if (!rule->rule.has_static_node)
2768                                 goto next;
2769
2770                         uid = 0;
2771                         gid = 0;
2772                         mode = 0;
2773                         break;
2774                 case TK_A_OWNER_ID:
2775                         uid = cur->key.uid;
2776                         break;
2777                 case TK_A_GROUP_ID:
2778                         gid = cur->key.gid;
2779                         break;
2780                 case TK_A_MODE_ID:
2781                         mode = cur->key.mode;
2782                         break;
2783                 case TK_A_STATIC_NODE: {
2784                         char filename[UTIL_PATH_SIZE];
2785                         struct stat stats;
2786
2787                         /* we assure, that the permissions tokens are sorted before the static token */
2788                         if (mode == 0 && uid == 0 && gid == 0)
2789                                 goto next;
2790                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2791                                       &rules->buf[cur->key.value_off], NULL);
2792                         if (stat(filename, &stats) != 0)
2793                                 goto next;
2794                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2795                                 goto next;
2796
2797                         if (mode == 0 && gid > 0)
2798                                 mode = 0660;
2799                         if (mode != (stats.st_mode & 0777)) {
2800                                 chmod(filename, mode);
2801                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2802                         }
2803
2804                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2805                                 chown(filename, uid, gid);
2806                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2807                         }
2808
2809                         utimensat(AT_FDCWD, filename, NULL, 0);
2810                         break;
2811                 }
2812                 case TK_END:
2813                         return;
2814                 }
2815
2816                 cur++;
2817                 continue;
2818 next:
2819                 /* fast-forward to next rule */
2820                 cur = rule + rule->rule.token_count;
2821                 continue;
2822         }
2823 }