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_PARENTS_MAX,
 140
 141         TK_M_TEST,                      /* val, mode_t */
 142         TK_M_PROGRAM,                   /* val */
 143         TK_M_IMPORT_FILE,               /* val */
 144         TK_M_IMPORT_PROG,               /* val */
 145         TK_M_IMPORT_DB,                 /* val */
 146         TK_M_IMPORT_CMDLINE,            /* val */
 147         TK_M_IMPORT_PARENT,             /* val */
 148         TK_M_RESULT,                    /* val */
 149         TK_M_MAX,
 150
 151         TK_A_STRING_ESCAPE_NONE,
 152         TK_A_STRING_ESCAPE_REPLACE,
 153         TK_A_INOTIFY_WATCH,             /* int */
 154         TK_A_DEVLINK_PRIO,              /* int */
 155         TK_A_OWNER,                     /* val */
 156         TK_A_GROUP,                     /* val */
 157         TK_A_MODE,                      /* val */
 158         TK_A_OWNER_ID,                  /* uid_t */
 159         TK_A_GROUP_ID,                  /* gid_t */
 160         TK_A_MODE_ID,                   /* mode_t */
 161         TK_A_STATIC_NODE,               /* val */
 162         TK_A_ENV,                       /* val, attr */
 163         TK_A_TAG,                       /* val */
 164         TK_A_NAME,                      /* val */
 165         TK_A_DEVLINK,                   /* val */
 166         TK_A_EVENT_TIMEOUT,             /* int */
 167         TK_A_ATTR,                      /* val, attr */
 168         TK_A_RUN,                       /* val, bool */
 169         TK_A_GOTO,                      /* size_t */
 170
 171         TK_END,
 172 };
 173
 174 /* we try to pack stuff in a way that we take only 12 bytes per token */
 175 struct token {
 176         union {
 177                 unsigned char type;             /* same in rule and key */
 178                 struct {
 179                         enum token_type type:8;
 180                         bool can_set_name:1;
 181                         bool has_static_node:1;
 182                         unsigned int unused:6;
 183                         unsigned short token_count;
 184                         unsigned int label_off;
 185                         unsigned short filename_off;
 186                         unsigned short filename_line;
 187                 } rule;
 188                 struct {
 189                         enum token_type type:8;
 190                         enum operation_type op:8;
 191                         enum string_glob_type glob:8;
 192                         enum string_subst_type subst:4;
 193                         enum string_subst_type attrsubst:4;
 194                         unsigned int value_off;
 195                         union {
 196                                 unsigned int attr_off;
 197                                 int devlink_unique;
 198                                 int fail_on_error;
 199                                 unsigned int rule_goto;
 200                                 mode_t  mode;
 201                                 uid_t uid;
 202                                 gid_t gid;
 203                                 int devlink_prio;
 204                                 int event_timeout;
 205                                 int watch;
 206                         };
 207                 } key;
 208         };
 209 };
 210
 211 #define MAX_TK          64
 212 struct rule_tmp {
 213         struct udev_rules *rules;
 214         struct token rule;
 215         struct token token[MAX_TK];
 216         unsigned int token_cur;
 217 };
 218
 219 #ifdef ENABLE_DEBUG
 220 static const char *operation_str(enum operation_type type)
 221 {
 222         static const char *operation_strs[] = {
 223                 [OP_UNSET] =            "UNSET",
 224                 [OP_MATCH] =            "match",
 225                 [OP_NOMATCH] =          "nomatch",
 226                 [OP_MATCH_MAX] =        "MATCH_MAX",
 227
 228                 [OP_ADD] =              "add",
 229                 [OP_ASSIGN] =           "assign",
 230                 [OP_ASSIGN_FINAL] =     "assign-final",
 231 }       ;
 232
 233         return operation_strs[type];
 234 }
 235
 236 static const char *string_glob_str(enum string_glob_type type)
 237 {
 238         static const char *string_glob_strs[] = {
 239                 [GL_UNSET] =            "UNSET",
 240                 [GL_PLAIN] =            "plain",
 241                 [GL_GLOB] =             "glob",
 242                 [GL_SPLIT] =            "split",
 243                 [GL_SPLIT_GLOB] =       "split-glob",
 244                 [GL_SOMETHING] =        "split-glob",
 245         };
 246
 247         return string_glob_strs[type];
 248 }
 249
 250 static const char *token_str(enum token_type type)
 251 {
 252         static const char *token_strs[] = {
 253                 [TK_UNSET] =                    "UNSET",
 254                 [TK_RULE] =                     "RULE",
 255
 256                 [TK_M_ACTION] =                 "M ACTION",
 257                 [TK_M_DEVPATH] =                "M DEVPATH",
 258                 [TK_M_KERNEL] =                 "M KERNEL",
 259                 [TK_M_DEVLINK] =                "M DEVLINK",
 260                 [TK_M_NAME] =                   "M NAME",
 261                 [TK_M_ENV] =                    "M ENV",
 262                 [TK_M_TAG] =                    "M TAG",
 263                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 264                 [TK_M_DRIVER] =                 "M DRIVER",
 265                 [TK_M_WAITFOR] =                "M WAITFOR",
 266                 [TK_M_ATTR] =                   "M ATTR",
 267
 268                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 269                 [TK_M_KERNELS] =                "M KERNELS",
 270                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 271                 [TK_M_DRIVERS] =                "M DRIVERS",
 272                 [TK_M_ATTRS] =                  "M ATTRS",
 273                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 274
 275                 [TK_M_TEST] =                   "M TEST",
 276                 [TK_M_PROGRAM] =                "M PROGRAM",
 277                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 278                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 279                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 280                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 281                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 282                 [TK_M_RESULT] =                 "M RESULT",
 283                 [TK_M_MAX] =                    "M MAX",
 284
 285                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 286                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 287                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 288                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 289                 [TK_A_OWNER] =                  "A OWNER",
 290                 [TK_A_GROUP] =                  "A GROUP",
 291                 [TK_A_MODE] =                   "A MODE",
 292                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 293                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 294                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 295                 [TK_A_MODE_ID] =                "A MODE_ID",
 296                 [TK_A_ENV] =                    "A ENV",
 297                 [TK_A_TAG] =                    "A ENV",
 298                 [TK_A_NAME] =                   "A NAME",
 299                 [TK_A_DEVLINK] =                "A DEVLINK",
 300                 [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 301                 [TK_A_ATTR] =                   "A ATTR",
 302                 [TK_A_RUN] =                    "A RUN",
 303                 [TK_A_GOTO] =                   "A GOTO",
 304
 305                 [TK_END] =                      "END",
 306         };
 307
 308         return token_strs[type];
 309 }
 310
 311 static void dump_token(struct udev_rules *rules, struct token *token)
 312 {
 313         enum token_type type = token->type;
 314         enum operation_type op = token->key.op;
 315         enum string_glob_type glob = token->key.glob;
 316         const char *value = &rules->buf[token->key.value_off];
 317         const char *attr = &rules->buf[token->key.attr_off];
 318
 319         switch (type) {
 320         case TK_RULE:
 321                 {
 322                         const char *tks_ptr = (char *)rules->tokens;
 323                         const char *tk_ptr = (char *)token;
 324                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 325
 326                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 327                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 328                             idx, token->rule.token_count,
 329                             &rules->buf[token->rule.label_off]);
 330                         break;
 331                 }
 332         case TK_M_ACTION:
 333         case TK_M_DEVPATH:
 334         case TK_M_KERNEL:
 335         case TK_M_SUBSYSTEM:
 336         case TK_M_DRIVER:
 337         case TK_M_WAITFOR:
 338         case TK_M_DEVLINK:
 339         case TK_M_NAME:
 340         case TK_M_KERNELS:
 341         case TK_M_SUBSYSTEMS:
 342         case TK_M_DRIVERS:
 343         case TK_M_PROGRAM:
 344         case TK_M_IMPORT_FILE:
 345         case TK_M_IMPORT_PROG:
 346         case TK_M_IMPORT_DB:
 347         case TK_M_IMPORT_CMDLINE:
 348         case TK_M_IMPORT_PARENT:
 349         case TK_M_RESULT:
 350         case TK_A_NAME:
 351         case TK_A_DEVLINK:
 352         case TK_A_OWNER:
 353         case TK_A_GROUP:
 354         case TK_A_MODE:
 355         case TK_A_RUN:
 356                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 357                     token_str(type), operation_str(op), value, string_glob_str(glob));
 358                 break;
 359         case TK_M_ATTR:
 360         case TK_M_ATTRS:
 361         case TK_M_ENV:
 362         case TK_A_ATTR:
 363         case TK_A_ENV:
 364                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 365                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 366                 break;
 367         case TK_M_TAG:
 368         case TK_A_TAG:
 369                 dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);
 370                 break;
 371         case TK_A_STRING_ESCAPE_NONE:
 372         case TK_A_STRING_ESCAPE_REPLACE:
 373                 dbg(rules->udev, "%s\n", token_str(type));
 374                 break;
 375         case TK_M_TEST:
 376                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 377                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 378                 break;
 379         case TK_A_INOTIFY_WATCH:
 380                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 381                 break;
 382         case TK_A_DEVLINK_PRIO:
 383                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.devlink_prio);
 384                 break;
 385         case TK_A_OWNER_ID:
 386                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 387                 break;
 388         case TK_A_GROUP_ID:
 389                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 390                 break;
 391         case TK_A_MODE_ID:
 392                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 393                 break;
 394         case TK_A_STATIC_NODE:
 395                 dbg(rules->udev, "%s '%s'\n", token_str(type), value);
 396                 break;
 397         case TK_A_EVENT_TIMEOUT:
 398                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
 399                 break;
 400         case TK_A_GOTO:
 401                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 402                 break;
 403         case TK_END:
 404                 dbg(rules->udev, "* %s\n", token_str(type));
 405                 break;
 406         case TK_M_PARENTS_MIN:
 407         case TK_M_PARENTS_MAX:
 408         case TK_M_MAX:
 409         case TK_UNSET:
 410                 dbg(rules->udev, "unknown type %u\n", type);
 411                 break;
 412         }
 413 }
 414
 415 static void dump_rules(struct udev_rules *rules)
 416 {
 417         unsigned int i;
 418
 419         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 420             rules->token_cur,
 421             rules->token_cur * sizeof(struct token),
 422             rules->buf_count,
 423             rules->buf_cur);
 424         for(i = 0; i < rules->token_cur; i++)
 425                 dump_token(rules, &rules->tokens[i]);
 426 }
 427 #else
 428 static inline const char *operation_str(enum operation_type type) { return NULL; }
 429 static inline const char *token_str(enum token_type type) { return NULL; }
 430 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 431 static inline void dump_rules(struct udev_rules *rules) {}
 432 #endif /* ENABLE_DEBUG */
 433
 434 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 435 {
 436         int off;
 437
 438         /* grow buffer if needed */
 439         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 440                 char *buf;
 441                 unsigned int add;
 442
 443                 /* double the buffer size */
 444                 add = rules->buf_max;
 445                 if (add < bytes * 8)
 446                         add = bytes * 8;
 447
 448                 buf = realloc(rules->buf, rules->buf_max + add);
 449                 if (buf == NULL)
 450                         return -1;
 451                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 452                 rules->buf = buf;
 453                 rules->buf_max += add;
 454         }
 455         off = rules->buf_cur;
 456         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 457         rules->buf_cur += bytes;
 458         rules->buf_count++;
 459         return off;
 460 }
 461
 462 static int add_string(struct udev_rules *rules, const char *str)
 463 {
 464         unsigned int node_idx;
 465         struct trie_node *new_node;
 466         unsigned int new_node_idx;
 467         unsigned char key;
 468         unsigned short len;
 469         unsigned int depth;
 470         unsigned int off;
 471         struct trie_node *parent;
 472
 473         /* walk trie, start from last character of str to find matching tails */
 474         len = strlen(str);
 475         key = str[len-1];
 476         node_idx = 0;
 477         for (depth = 0; depth <= len; depth++) {
 478                 struct trie_node *node;
 479                 unsigned int child_idx;
 480
 481                 node = &rules->trie_nodes[node_idx];
 482                 off = node->value_off + node->value_len - len;
 483
 484                 /* match against current node */
 485                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 486                         return off;
 487
 488                 /* lookup child node */
 489                 key = str[len - 1 - depth];
 490                 child_idx = node->child_idx;
 491                 while (child_idx > 0) {
 492                         struct trie_node *child;
 493
 494                         child = &rules->trie_nodes[child_idx];
 495                         if (child->key == key)
 496                                 break;
 497                         child_idx = child->next_child_idx;
 498                 }
 499                 if (child_idx == 0)
 500                         break;
 501                 node_idx = child_idx;
 502         }
 503
 504         /* string not found, add it */
 505         off = add_new_string(rules, str, len + 1);
 506
 507         /* grow trie nodes if needed */
 508         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 509                 struct trie_node *nodes;
 510                 unsigned int add;
 511
 512                 /* double the buffer size */
 513                 add = rules->trie_nodes_max;
 514                 if (add < 8)
 515                         add = 8;
 516
 517                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 518                 if (nodes == NULL)
 519                         return -1;
 520                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 521                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 522                 rules->trie_nodes = nodes;
 523                 rules->trie_nodes_max += add;
 524         }
 525
 526         /* get a new node */
 527         new_node_idx = rules->trie_nodes_cur;
 528         rules->trie_nodes_cur++;
 529         new_node = &rules->trie_nodes[new_node_idx];
 530         memset(new_node, 0x00, sizeof(struct trie_node));
 531         new_node->value_off = off;
 532         new_node->value_len = len;
 533         new_node->key = key;
 534
 535         /* join the parent's child list */
 536         parent = &rules->trie_nodes[node_idx];
 537         if (parent->child_idx == 0) {
 538                 parent->child_idx = new_node_idx;
 539         } else {
 540                 struct trie_node *last_child;
 541
 542                 last_child = &rules->trie_nodes[parent->last_child_idx];
 543                 last_child->next_child_idx = new_node_idx;
 544         }
 545         parent->last_child_idx = new_node_idx;
 546         return off;
 547 }
 548
 549 static int add_token(struct udev_rules *rules, struct token *token)
 550 {
 551         /* grow buffer if needed */
 552         if (rules->token_cur+1 >= rules->token_max) {
 553                 struct token *tokens;
 554                 unsigned int add;
 555
 556                 /* double the buffer size */
 557                 add = rules->token_max;
 558                 if (add < 8)
 559                         add = 8;
 560
 561                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 562                 if (tokens == NULL)
 563                         return -1;
 564                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 565                 rules->tokens = tokens;
 566                 rules->token_max += add;
 567         }
 568         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 569         rules->token_cur++;
 570         return 0;
 571 }
 572
 573 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 574 {
 575         unsigned int i;
 576         uid_t uid;
 577         unsigned int off;
 578
 579         /* lookup, if we know it already */
 580         for (i = 0; i < rules->uids_cur; i++) {
 581                 off = rules->uids[i].name_off;
 582                 if (strcmp(&rules->buf[off], owner) == 0) {
 583                         uid = rules->uids[i].uid;
 584                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 585                         return uid;
 586                 }
 587         }
 588         uid = util_lookup_user(rules->udev, owner);
 589
 590         /* grow buffer if needed */
 591         if (rules->uids_cur+1 >= rules->uids_max) {
 592                 struct uid_gid *uids;
 593                 unsigned int add;
 594
 595                 /* double the buffer size */
 596                 add = rules->uids_max;
 597                 if (add < 1)
 598                         add = 8;
 599
 600                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 601                 if (uids == NULL)
 602                         return uid;
 603                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 604                 rules->uids = uids;
 605                 rules->uids_max += add;
 606         }
 607         rules->uids[rules->uids_cur].uid = uid;
 608         off = add_string(rules, owner);
 609         if (off <= 0)
 610                 return uid;
 611         rules->uids[rules->uids_cur].name_off = off;
 612         rules->uids_cur++;
 613         return uid;
 614 }
 615
 616 static gid_t add_gid(struct udev_rules *rules, const char *group)
 617 {
 618         unsigned int i;
 619         gid_t gid;
 620         unsigned int off;
 621
 622         /* lookup, if we know it already */
 623         for (i = 0; i < rules->gids_cur; i++) {
 624                 off = rules->gids[i].name_off;
 625                 if (strcmp(&rules->buf[off], group) == 0) {
 626                         gid = rules->gids[i].gid;
 627                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 628                         return gid;
 629                 }
 630         }
 631         gid = util_lookup_group(rules->udev, group);
 632
 633         /* grow buffer if needed */
 634         if (rules->gids_cur+1 >= rules->gids_max) {
 635                 struct uid_gid *gids;
 636                 unsigned int add;
 637
 638                 /* double the buffer size */
 639                 add = rules->gids_max;
 640                 if (add < 1)
 641                         add = 8;
 642
 643                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 644                 if (gids == NULL)
 645                         return gid;
 646                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 647                 rules->gids = gids;
 648                 rules->gids_max += add;
 649         }
 650         rules->gids[rules->gids_cur].gid = gid;
 651         off = add_string(rules, group);
 652         if (off <= 0)
 653                 return gid;
 654         rules->gids[rules->gids_cur].name_off = off;
 655         rules->gids_cur++;
 656         return gid;
 657 }
 658
 659 static int import_property_from_string(struct udev_device *dev, char *line)
 660 {
 661         struct udev *udev = udev_device_get_udev(dev);
 662         char *key;
 663         char *val;
 664         size_t len;
 665
 666         /* find key */
 667         key = line;
 668         while (isspace(key[0]))
 669                 key++;
 670
 671         /* comment or empty line */
 672         if (key[0] == '#' || key[0] == '\0')
 673                 return -1;
 674
 675         /* split key/value */
 676         val = strchr(key, '=');
 677         if (val == NULL)
 678                 return -1;
 679         val[0] = '\0';
 680         val++;
 681
 682         /* find value */
 683         while (isspace(val[0]))
 684                 val++;
 685
 686         /* terminate key */
 687         len = strlen(key);
 688         if (len == 0)
 689                 return -1;
 690         while (isspace(key[len-1]))
 691                 len--;
 692         key[len] = '\0';
 693
 694         /* terminate value */
 695         len = strlen(val);
 696         if (len == 0)
 697                 return -1;
 698         while (isspace(val[len-1]))
 699                 len--;
 700         val[len] = '\0';
 701
 702         if (len == 0)
 703                 return -1;
 704
 705         /* unquote */
 706         if (val[0] == '"' || val[0] == '\'') {
 707                 if (val[len-1] != val[0]) {
 708                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 709                         return -1;
 710                 }
 711                 val[len-1] = '\0';
 712                 val++;
 713         }
 714
 715         dbg(udev, "adding '%s'='%s'\n", key, val);
 716
 717         /* handle device, renamed by external tool, returning new path */
 718         if (strcmp(key, "DEVPATH") == 0) {
 719                 char syspath[UTIL_PATH_SIZE];
 720
 721                 info(udev, "updating devpath from '%s' to '%s'\n",
 722                      udev_device_get_devpath(dev), val);
 723                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 724                 udev_device_set_syspath(dev, syspath);
 725         } else {
 726                 struct udev_list_entry *entry;
 727
 728                 entry = udev_device_add_property(dev, key, val);
 729                 /* store in db, skip private keys */
 730                 if (key[0] != '.')
 731                         udev_list_entry_set_flags(entry, 1);
 732         }
 733         return 0;
 734 }
 735
 736 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 737 {
 738         FILE *f;
 739         char line[UTIL_LINE_SIZE];
 740
 741         f = fopen(filename, "r");
 742         if (f == NULL)
 743                 return -1;
 744         while (fgets(line, sizeof(line), f) != NULL)
 745                 import_property_from_string(dev, line);
 746         fclose(f);
 747         return 0;
 748 }
 749
 750 static int import_program_into_properties(struct udev_device *dev, const char *program)
 751 {
 752         struct udev *udev = udev_device_get_udev(dev);
 753         char **envp;
 754         char result[UTIL_LINE_SIZE];
 755         size_t reslen;
 756         char *line;
 757
 758         envp = udev_device_get_properties_envp(dev);
 759         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL, false) != 0)
 760                 return -1;
 761
 762         line = result;
 763         while (line != NULL) {
 764                 char *pos;
 765
 766                 pos = strchr(line, '\n');
 767                 if (pos != NULL) {
 768                         pos[0] = '\0';
 769                         pos = &pos[1];
 770                 }
 771                 import_property_from_string(dev, line);
 772                 line = pos;
 773         }
 774         return 0;
 775 }
 776
 777 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 778 {
 779         struct udev *udev = udev_device_get_udev(dev);
 780         struct udev_device *dev_parent;
 781         struct udev_list_entry *list_entry;
 782
 783         dev_parent = udev_device_get_parent(dev);
 784         if (dev_parent == NULL)
 785                 return -1;
 786
 787         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 788         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 789                 const char *key = udev_list_entry_get_name(list_entry);
 790                 const char *val = udev_list_entry_get_value(list_entry);
 791
 792                 if (fnmatch(filter, key, 0) == 0) {
 793                         struct udev_list_entry *entry;
 794
 795                         dbg(udev, "import key '%s=%s'\n", key, val);
 796                         entry = udev_device_add_property(dev, key, val);
 797                         /* store in db, skip private keys */
 798                         if (key[0] != '.')
 799                                 udev_list_entry_set_flags(entry, 1);
 800                 }
 801         }
 802         return 0;
 803 }
 804
 805 #define WAIT_LOOP_PER_SECOND            50
 806 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 807 {
 808         struct udev *udev = udev_device_get_udev(dev);
 809         char filepath[UTIL_PATH_SIZE];
 810         char devicepath[UTIL_PATH_SIZE];
 811         struct stat stats;
 812         int loop = timeout * WAIT_LOOP_PER_SECOND;
 813
 814         /* a relative path is a device attribute */
 815         devicepath[0] = '\0';
 816         if (file[0] != '/') {
 817                 util_strscpyl(devicepath, sizeof(devicepath),
 818                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 819                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 820                 file = filepath;
 821         }
 822
 823         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 824         while (--loop) {
 825                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 826
 827                 /* lookup file */
 828                 if (stat(file, &stats) == 0) {
 829                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 830                         return 0;
 831                 }
 832                 /* make sure, the device did not disappear in the meantime */
 833                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 834                         info(udev, "device disappeared while waiting for '%s'\n", file);
 835                         return -2;
 836                 }
 837                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 838                 nanosleep(&duration, NULL);
 839         }
 840         info(udev, "waiting for '%s' failed\n", file);
 841         return -1;
 842 }
 843
 844 static int attr_subst_subdir(char *attr, size_t len)
 845 {
 846         bool found = false;
 847
 848         if (strstr(attr, "/*/")) {
 849                 char *pos;
 850                 char dirname[UTIL_PATH_SIZE];
 851                 const char *tail;
 852                 DIR *dir;
 853
 854                 util_strscpy(dirname, sizeof(dirname), attr);
 855                 pos = strstr(dirname, "/*/");
 856                 if (pos == NULL)
 857                         return -1;
 858                 pos[0] = '\0';
 859                 tail = &pos[2];
 860                 dir = opendir(dirname);
 861                 if (dir != NULL) {
 862                         struct dirent *dent;
 863
 864                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 865                                 struct stat stats;
 866
 867                                 if (dent->d_name[0] == '.')
 868                                         continue;
 869                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 870                                 if (stat(attr, &stats) == 0) {
 871                                         found = true;
 872                                         break;
 873                                 }
 874                         }
 875                         closedir(dir);
 876                 }
 877         }
 878
 879         return found;
 880 }
 881
 882 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 883 {
 884         char *linepos;
 885         char *temp;
 886
 887         linepos = *line;
 888         if (linepos == NULL || linepos[0] == '\0')
 889                 return -1;
 890
 891         /* skip whitespace */
 892         while (isspace(linepos[0]) || linepos[0] == ',')
 893                 linepos++;
 894
 895         /* get the key */
 896         if (linepos[0] == '\0')
 897                 return -1;
 898         *key = linepos;
 899
 900         for (;;) {
 901                 linepos++;
 902                 if (linepos[0] == '\0')
 903                         return -1;
 904                 if (isspace(linepos[0]))
 905                         break;
 906                 if (linepos[0] == '=')
 907                         break;
 908                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 909                         if (linepos[1] == '=')
 910                                 break;
 911         }
 912
 913         /* remember end of key */
 914         temp = linepos;
 915
 916         /* skip whitespace after key */
 917         while (isspace(linepos[0]))
 918                 linepos++;
 919         if (linepos[0] == '\0')
 920                 return -1;
 921
 922         /* get operation type */
 923         if (linepos[0] == '=' && linepos[1] == '=') {
 924                 *op = OP_MATCH;
 925                 linepos += 2;
 926         } else if (linepos[0] == '!' && linepos[1] == '=') {
 927                 *op = OP_NOMATCH;
 928                 linepos += 2;
 929         } else if (linepos[0] == '+' && linepos[1] == '=') {
 930                 *op = OP_ADD;
 931                 linepos += 2;
 932         } else if (linepos[0] == '=') {
 933                 *op = OP_ASSIGN;
 934                 linepos++;
 935         } else if (linepos[0] == ':' && linepos[1] == '=') {
 936                 *op = OP_ASSIGN_FINAL;
 937                 linepos += 2;
 938         } else
 939                 return -1;
 940
 941         /* terminate key */
 942         temp[0] = '\0';
 943
 944         /* skip whitespace after operator */
 945         while (isspace(linepos[0]))
 946                 linepos++;
 947         if (linepos[0] == '\0')
 948                 return -1;
 949
 950         /* get the value */
 951         if (linepos[0] == '"')
 952                 linepos++;
 953         else
 954                 return -1;
 955         *value = linepos;
 956
 957         /* terminate */
 958         temp = strchr(linepos, '"');
 959         if (!temp)
 960                 return -1;
 961         temp[0] = '\0';
 962         temp++;
 963         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 964
 965         /* move line to next key */
 966         *line = temp;
 967         return 0;
 968 }
 969
 970 /* extract possible KEY{attr} */
 971 static char *get_key_attribute(struct udev *udev, char *str)
 972 {
 973         char *pos;
 974         char *attr;
 975
 976         attr = strchr(str, '{');
 977         if (attr != NULL) {
 978                 attr++;
 979                 pos = strchr(attr, '}');
 980                 if (pos == NULL) {
 981                         err(udev, "missing closing brace for format\n");
 982                         return NULL;
 983                 }
 984                 pos[0] = '\0';
 985                 dbg(udev, "attribute='%s'\n", attr);
 986                 return attr;
 987         }
 988         return NULL;
 989 }
 990
 991 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 992                         enum operation_type op,
 993                         const char *value, const void *data)
 994 {
 995         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 996         const char *attr = NULL;
 997
 998         memset(token, 0x00, sizeof(struct token));
 999
1000         switch (type) {
1001         case TK_M_ACTION:
1002         case TK_M_DEVPATH:
1003         case TK_M_KERNEL:
1004         case TK_M_SUBSYSTEM:
1005         case TK_M_DRIVER:
1006         case TK_M_WAITFOR:
1007         case TK_M_DEVLINK:
1008         case TK_M_NAME:
1009         case TK_M_KERNELS:
1010         case TK_M_SUBSYSTEMS:
1011         case TK_M_DRIVERS:
1012         case TK_M_PROGRAM:
1013         case TK_M_IMPORT_FILE:
1014         case TK_M_IMPORT_PROG:
1015         case TK_M_IMPORT_DB:
1016         case TK_M_IMPORT_CMDLINE:
1017         case TK_M_IMPORT_PARENT:
1018         case TK_M_RESULT:
1019         case TK_A_OWNER:
1020         case TK_A_GROUP:
1021         case TK_A_MODE:
1022         case TK_A_NAME:
1023         case TK_A_GOTO:
1024         case TK_M_TAG:
1025         case TK_A_TAG:
1026                 token->key.value_off = add_string(rule_tmp->rules, value);
1027                 break;
1028         case TK_M_ENV:
1029         case TK_M_ATTR:
1030         case TK_M_ATTRS:
1031         case TK_A_ATTR:
1032         case TK_A_ENV:
1033                 attr = data;
1034                 token->key.value_off = add_string(rule_tmp->rules, value);
1035                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1036                 break;
1037         case TK_A_DEVLINK:
1038                 token->key.value_off = add_string(rule_tmp->rules, value);
1039                 token->key.devlink_unique = *(int *)data;
1040                 break;
1041         case TK_M_TEST:
1042                 token->key.value_off = add_string(rule_tmp->rules, value);
1043                 if (data != NULL)
1044                         token->key.mode = *(mode_t *)data;
1045                 break;
1046         case TK_A_STRING_ESCAPE_NONE:
1047         case TK_A_STRING_ESCAPE_REPLACE:
1048                 break;
1049         case TK_A_RUN:
1050                 token->key.value_off = add_string(rule_tmp->rules, value);
1051                 token->key.fail_on_error = *(int *)data;
1052                 break;
1053         case TK_A_INOTIFY_WATCH:
1054         case TK_A_DEVLINK_PRIO:
1055                 token->key.devlink_prio = *(int *)data;
1056                 break;
1057         case TK_A_OWNER_ID:
1058                 token->key.uid = *(uid_t *)data;
1059                 break;
1060         case TK_A_GROUP_ID:
1061                 token->key.gid = *(gid_t *)data;
1062                 break;
1063         case TK_A_MODE_ID:
1064                 token->key.mode = *(mode_t *)data;
1065                 break;
1066         case TK_A_STATIC_NODE:
1067                 token->key.value_off = add_string(rule_tmp->rules, value);
1068                 break;
1069         case TK_A_EVENT_TIMEOUT:
1070                 token->key.event_timeout = *(int *)data;
1071                 break;
1072         case TK_RULE:
1073         case TK_M_PARENTS_MIN:
1074         case TK_M_PARENTS_MAX:
1075         case TK_M_MAX:
1076         case TK_END:
1077         case TK_UNSET:
1078                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1079                 return -1;
1080         }
1081
1082         if (value != NULL && type < TK_M_MAX) {
1083                 /* check if we need to split or call fnmatch() while matching rules */
1084                 enum string_glob_type glob;
1085                 int has_split;
1086                 int has_glob;
1087
1088                 has_split = (strchr(value, '|') != NULL);
1089                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1090                 if (has_split && has_glob) {
1091                         glob = GL_SPLIT_GLOB;
1092                 } else if (has_split) {
1093                         glob = GL_SPLIT;
1094                 } else if (has_glob) {
1095                         if (strcmp(value, "?*") == 0)
1096                                 glob = GL_SOMETHING;
1097                         else
1098                                 glob = GL_GLOB;
1099                 } else {
1100                         glob = GL_PLAIN;
1101                 }
1102                 token->key.glob = glob;
1103         }
1104
1105         if (value != NULL && type > TK_M_MAX) {
1106                 /* check if assigned value has substitution chars */
1107                 if (value[0] == '[')
1108                         token->key.subst = SB_SUBSYS;
1109                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1110                         token->key.subst = SB_FORMAT;
1111                 else
1112                         token->key.subst = SB_NONE;
1113         }
1114
1115         if (attr != NULL) {
1116                 /* check if property/attribut name has substitution chars */
1117                 if (attr[0] == '[')
1118                         token->key.attrsubst = SB_SUBSYS;
1119                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1120                         token->key.attrsubst = SB_FORMAT;
1121                 else
1122                         token->key.attrsubst = SB_NONE;
1123         }
1124
1125         token->key.type = type;
1126         token->key.op = op;
1127         rule_tmp->token_cur++;
1128         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1129                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1130                 return -1;
1131         }
1132         return 0;
1133 }
1134
1135 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1136 {
1137         unsigned int i;
1138         unsigned int start = 0;
1139         unsigned int end = rule_tmp->token_cur;
1140
1141         for (i = 0; i < rule_tmp->token_cur; i++) {
1142                 enum token_type next_val = TK_UNSET;
1143                 unsigned int next_idx = 0;
1144                 unsigned int j;
1145
1146                 /* find smallest value */
1147                 for (j = start; j < end; j++) {
1148                         if (rule_tmp->token[j].type == TK_UNSET)
1149                                 continue;
1150                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1151                                 next_val = rule_tmp->token[j].type;
1152                                 next_idx = j;
1153                         }
1154                 }
1155
1156                 /* add token and mark done */
1157                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1158                         return -1;
1159                 rule_tmp->token[next_idx].type = TK_UNSET;
1160
1161                 /* shrink range */
1162                 if (next_idx == start)
1163                         start++;
1164                 if (next_idx+1 == end)
1165                         end--;
1166         }
1167         return 0;
1168 }
1169
1170 static int add_rule(struct udev_rules *rules, char *line,
1171                     const char *filename, unsigned int filename_off, unsigned int lineno)
1172 {
1173         char *linepos;
1174         char *attr;
1175         struct rule_tmp rule_tmp;
1176         bool bus_warn = false;
1177         bool sysfs_warn = false;
1178         bool id_warn = false;
1179
1180         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1181         rule_tmp.rules = rules;
1182         rule_tmp.rule.type = TK_RULE;
1183         rule_tmp.rule.rule.filename_off = filename_off;
1184         rule_tmp.rule.rule.filename_line = lineno;
1185
1186         linepos = line;
1187         for (;;) {
1188                 char *key;
1189                 char *value;
1190                 enum operation_type op;
1191
1192                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1193                         break;
1194
1195                 if (strcmp(key, "ACTION") == 0) {
1196                         if (op > OP_MATCH_MAX) {
1197                                 err(rules->udev, "invalid ACTION operation\n");
1198                                 goto invalid;
1199                         }
1200                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1201                         continue;
1202                 }
1203
1204                 if (strcmp(key, "DEVPATH") == 0) {
1205                         if (op > OP_MATCH_MAX) {
1206                                 err(rules->udev, "invalid DEVPATH operation\n");
1207                                 goto invalid;
1208                         }
1209                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1210                         continue;
1211                 }
1212
1213                 if (strcmp(key, "KERNEL") == 0) {
1214                         if (op > OP_MATCH_MAX) {
1215                                 err(rules->udev, "invalid KERNEL operation\n");
1216                                 goto invalid;
1217                         }
1218                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1219                         continue;
1220                 }
1221
1222                 if (strcmp(key, "SUBSYSTEM") == 0) {
1223                         if (op > OP_MATCH_MAX) {
1224                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1225                                 goto invalid;
1226                         }
1227                         /* bus, class, subsystem events should all be the same */
1228                         if (strcmp(value, "subsystem") == 0 ||
1229                             strcmp(value, "bus") == 0 ||
1230                             strcmp(value, "class") == 0) {
1231                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1232                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1233                                             "please fix it in %s:%u", value, filename, lineno);
1234                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1235                         } else
1236                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1237                         continue;
1238                 }
1239
1240                 if (strcmp(key, "DRIVER") == 0) {
1241                         if (op > OP_MATCH_MAX) {
1242                                 err(rules->udev, "invalid DRIVER operation\n");
1243                                 goto invalid;
1244                         }
1245                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1246                         continue;
1247                 }
1248
1249                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1250                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1251                         if (attr == NULL) {
1252                                 err(rules->udev, "error parsing ATTR attribute\n");
1253                                 goto invalid;
1254                         }
1255                         if (op < OP_MATCH_MAX) {
1256                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1257                         } else {
1258                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1259                         }
1260                         continue;
1261                 }
1262
1263                 if (strcmp(key, "KERNELS") == 0) {
1264                         if (op > OP_MATCH_MAX) {
1265                                 err(rules->udev, "invalid KERNELS operation\n");
1266                                 goto invalid;
1267                         }
1268                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1269                         continue;
1270                 }
1271
1272                 if (strcmp(key, "ID") == 0) {
1273                         if (!id_warn) {
1274                                 id_warn = true;
1275                                 err(rules->udev, "ID= will be removed in a future udev version, "
1276                                     "please use KERNEL= to match the event device, or KERNELS= "
1277                                     "to match a parent device, in %s:%u\n", filename, lineno);
1278                         }
1279                         if (op > OP_MATCH_MAX) {
1280                                 err(rules->udev, "invalid KERNELS operation\n");
1281                                 goto invalid;
1282                         }
1283                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1284                         continue;
1285                 }
1286
1287                 if (strcmp(key, "SUBSYSTEMS") == 0) {
1288                         if (op > OP_MATCH_MAX) {
1289                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1290                                 goto invalid;
1291                         }
1292                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1293                         continue;
1294                 }
1295
1296                 if (strcmp(key, "BUS") == 0) {
1297                         if (!bus_warn) {
1298                                 bus_warn = true;
1299                                 err(rules->udev, "BUS= will be removed in a future udev version, "
1300                                     "please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "
1301                                     "to match a parent device, in %s:%u\n", filename, lineno);
1302                         }
1303                         if (op > OP_MATCH_MAX) {
1304                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1305                                 goto invalid;
1306                         }
1307                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1308                         continue;
1309                 }
1310
1311                 if (strcmp(key, "DRIVERS") == 0) {
1312                         if (op > OP_MATCH_MAX) {
1313                                 err(rules->udev, "invalid DRIVERS operation\n");
1314                                 goto invalid;
1315                         }
1316                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1317                         continue;
1318                 }
1319
1320                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {
1321                         if (op > OP_MATCH_MAX) {
1322                                 err(rules->udev, "invalid ATTRS operation\n");
1323                                 goto invalid;
1324                         }
1325                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1326                         if (attr == NULL) {
1327                                 err(rules->udev, "error parsing ATTRS attribute\n");
1328                                 goto invalid;
1329                         }
1330                         if (strncmp(attr, "device/", 7) == 0)
1331                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1332                                     "please fix it in %s:%u", filename, lineno);
1333                         else if (strstr(attr, "../") != NULL)
1334                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1335                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1336                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1337                         continue;
1338                 }
1339
1340                 if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1341                         if (!sysfs_warn) {
1342                                 sysfs_warn = true;
1343                                 err(rules->udev, "SYSFS{}= will be removed in a future udev version, "
1344                                     "please use ATTR{}= to match the event device, or ATTRS{}= "
1345                                     "to match a parent device, in %s:%u\n", filename, lineno);
1346                         }
1347                         if (op > OP_MATCH_MAX) {
1348                                 err(rules->udev, "invalid ATTRS operation\n");
1349                                 goto invalid;
1350                         }
1351                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1352                         if (attr == NULL) {
1353                                 err(rules->udev, "error parsing ATTRS attribute\n");
1354                                 goto invalid;
1355                         }
1356                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1357                         continue;
1358                 }
1359
1360                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1361                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1362                         if (attr == NULL) {
1363                                 err(rules->udev, "error parsing ENV attribute\n");
1364                                 goto invalid;
1365                         }
1366                         if (op < OP_MATCH_MAX) {
1367                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1368                                         goto invalid;
1369                         } else {
1370                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1371                                         goto invalid;
1372                         }
1373                         continue;
1374                 }
1375
1376                 if (strcmp(key, "TAG") == 0) {
1377                         if (op < OP_MATCH_MAX)
1378                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1379                         else
1380                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1381                         continue;
1382                 }
1383
1384                 if (strcmp(key, "PROGRAM") == 0) {
1385                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1386                         continue;
1387                 }
1388
1389                 if (strcmp(key, "RESULT") == 0) {
1390                         if (op > OP_MATCH_MAX) {
1391                                 err(rules->udev, "invalid RESULT operation\n");
1392                                 goto invalid;
1393                         }
1394                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1395                         continue;
1396                 }
1397
1398                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1399                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1400                         if (attr != NULL && strstr(attr, "program")) {
1401                                 dbg(rules->udev, "IMPORT will be executed\n");
1402                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1403                         } else if (attr != NULL && strstr(attr, "file")) {
1404                                 dbg(rules->udev, "IMPORT will be included as file\n");
1405                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1406                         } else if (attr != NULL && strstr(attr, "db")) {
1407                                 dbg(rules->udev, "IMPORT will include db values\n");
1408                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1409                         } else if (attr != NULL && strstr(attr, "cmdline")) {
1410                                 dbg(rules->udev, "IMPORT will include db values\n");
1411                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1412                         } else if (attr != NULL && strstr(attr, "parent")) {
1413                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1414                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1415                         } else {
1416                                 /* figure it out if it is executable */
1417                                 char file[UTIL_PATH_SIZE];
1418                                 char *pos;
1419                                 struct stat statbuf;
1420
1421                                 /* allow programs in /lib/udev called without the path */
1422                                 if (value[0] != '/')
1423                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1424                                 else
1425                                         util_strscpy(file, sizeof(file), value);
1426                                 pos = strchr(file, ' ');
1427                                 if (pos)
1428                                         pos[0] = '\0';
1429                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1430                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1431                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1432                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1433                                 } else {
1434                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1435                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1436                                 }
1437                         }
1438                         continue;
1439                 }
1440
1441                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1442                         mode_t mode = 0;
1443
1444                         if (op > OP_MATCH_MAX) {
1445                                 err(rules->udev, "invalid TEST operation\n");
1446                                 goto invalid;
1447                         }
1448                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1449                         if (attr != NULL) {
1450                                 mode = strtol(attr, NULL, 8);
1451                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1452                         } else {
1453                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1454                         }
1455                         continue;
1456                 }
1457
1458                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1459                         int flag = 0;
1460
1461                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1462                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1463                                 flag = 1;
1464                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1465                         continue;
1466                 }
1467
1468                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1469                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1470                         continue;
1471                 }
1472
1473                 if (strcmp(key, "LABEL") == 0) {
1474                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1475                         continue;
1476                 }
1477
1478                 if (strcmp(key, "GOTO") == 0) {
1479                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1480                         continue;
1481                 }
1482
1483                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1484                         if (op < OP_MATCH_MAX) {
1485                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1486                         } else {
1487                                 if (strcmp(value, "%k") == 0) {
1488                                         err(rules->udev, "NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1489                                             "please remove it from %s:%u\n", filename, lineno);
1490                                         continue;
1491                                 }
1492                                 if (value[0] == '\0') {
1493                                         info(rules->udev, "NAME=\"\" is ignored, because udev will not delete any device nodes, "
1494                                              "please remove it from %s:%u\n", filename, lineno);
1495                                         continue;
1496                                 }
1497                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1498                         }
1499                         rule_tmp.rule.rule.can_set_name = true;
1500                         continue;
1501                 }
1502
1503                 if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {
1504                         if (op < OP_MATCH_MAX) {
1505                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1506                         } else {
1507                                 int flag = 0;
1508
1509                                 attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);
1510                                 if (attr != NULL && strstr(attr, "unique") != NULL)
1511                                         flag = 1;
1512                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);
1513                         }
1514                         rule_tmp.rule.rule.can_set_name = true;
1515                         continue;
1516                 }
1517
1518                 if (strcmp(key, "OWNER") == 0) {
1519                         uid_t uid;
1520                         char *endptr;
1521
1522                         uid = strtoul(value, &endptr, 10);
1523                         if (endptr[0] == '\0') {
1524                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1525                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1526                                 uid = add_uid(rules, value);
1527                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1528                         } else if (rules->resolve_names >= 0) {
1529                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1530                         }
1531                         rule_tmp.rule.rule.can_set_name = true;
1532                         continue;
1533                 }
1534
1535                 if (strcmp(key, "GROUP") == 0) {
1536                         gid_t gid;
1537                         char *endptr;
1538
1539                         gid = strtoul(value, &endptr, 10);
1540                         if (endptr[0] == '\0') {
1541                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1542                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1543                                 gid = add_gid(rules, value);
1544                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1545                         } else if (rules->resolve_names >= 0) {
1546                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1547                         }
1548                         rule_tmp.rule.rule.can_set_name = true;
1549                         continue;
1550                 }
1551
1552                 if (strcmp(key, "MODE") == 0) {
1553                         mode_t mode;
1554                         char *endptr;
1555
1556                         mode = strtol(value, &endptr, 8);
1557                         if (endptr[0] == '\0')
1558                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1559                         else
1560                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1561                         rule_tmp.rule.rule.can_set_name = true;
1562                         continue;
1563                 }
1564
1565                 if (strcmp(key, "OPTIONS") == 0) {
1566                         const char *pos;
1567
1568                         pos = strstr(value, "link_priority=");
1569                         if (pos != NULL) {
1570                                 int prio = atoi(&pos[strlen("link_priority=")]);
1571
1572                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1573                                 dbg(rules->udev, "link priority=%i\n", prio);
1574                         }
1575                         pos = strstr(value, "event_timeout=");
1576                         if (pos != NULL) {
1577                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1578
1579                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, op, NULL, &tout);
1580                                 dbg(rules->udev, "event timeout=%i\n", tout);
1581                         }
1582                         pos = strstr(value, "string_escape=");
1583                         if (pos != NULL) {
1584                                 pos = &pos[strlen("string_escape=")];
1585                                 if (strncmp(pos, "none", strlen("none")) == 0)
1586                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1587                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1588                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1589                         }
1590                         pos = strstr(value, "nowatch");
1591                         if (pos != NULL) {
1592                                 const int off = 0;
1593
1594                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1595                                 dbg(rules->udev, "inotify watch of device disabled\n");
1596                         } else {
1597                                 pos = strstr(value, "watch");
1598                                 if (pos != NULL) {
1599                                         const int on = 1;
1600
1601                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1602                                         dbg(rules->udev, "inotify watch of device requested\n");
1603                                 }
1604                         }
1605                         pos = strstr(value, "static_node=");
1606                         if (pos != NULL) {
1607                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1608                                 rule_tmp.rule.rule.has_static_node = true;
1609                         }
1610                         continue;
1611                 }
1612                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1613         }
1614
1615         /* add rule token */
1616         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1617         if (add_token(rules, &rule_tmp.rule) != 0)
1618                 goto invalid;
1619
1620         /* add tokens to list, sorted by type */
1621         if (sort_token(rules, &rule_tmp) != 0)
1622                 goto invalid;
1623
1624         return 0;
1625 invalid:
1626         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1627         return -1;
1628 }
1629
1630 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1631 {
1632         FILE *f;
1633         unsigned int first_token;
1634         char line[UTIL_LINE_SIZE];
1635         int line_nr = 0;
1636         unsigned int i;
1637
1638         info(rules->udev, "reading '%s' as rules file\n", filename);
1639
1640         f = fopen(filename, "r");
1641         if (f == NULL)
1642                 return -1;
1643
1644         first_token = rules->token_cur;
1645
1646         while (fgets(line, sizeof(line), f) != NULL) {
1647                 char *key;
1648                 size_t len;
1649
1650                 /* skip whitespace */
1651                 line_nr++;
1652                 key = line;
1653                 while (isspace(key[0]))
1654                         key++;
1655
1656                 /* comment */
1657                 if (key[0] == '#')
1658                         continue;
1659
1660                 len = strlen(line);
1661                 if (len < 3)
1662                         continue;
1663
1664                 /* continue reading if backslash+newline is found */
1665                 while (line[len-2] == '\\') {
1666                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1667                                 break;
1668                         if (strlen(&line[len-2]) < 2)
1669                                 break;
1670                         line_nr++;
1671                         len = strlen(line);
1672                 }
1673
1674                 if (len+1 >= sizeof(line)) {
1675                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1676                         continue;
1677                 }
1678                 add_rule(rules, key, filename, filename_off, line_nr);
1679         }
1680         fclose(f);
1681
1682         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1683         for (i = first_token+1; i < rules->token_cur; i++) {
1684                 if (rules->tokens[i].type == TK_A_GOTO) {
1685                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1686                         unsigned int j;
1687
1688                         for (j = i+1; j < rules->token_cur; j++) {
1689                                 if (rules->tokens[j].type != TK_RULE)
1690                                         continue;
1691                                 if (rules->tokens[j].rule.label_off == 0)
1692                                         continue;
1693                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1694                                         continue;
1695                                 rules->tokens[i].key.rule_goto = j;
1696                                 break;
1697                         }
1698                         if (rules->tokens[i].key.rule_goto == 0)
1699                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1700                 }
1701         }
1702         return 0;
1703 }
1704
1705 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1706 {
1707         DIR *dir;
1708         char filename[UTIL_PATH_SIZE];
1709
1710         dbg(udev, "open directory '%s'\n", dirname);
1711         dir = opendir(dirname);
1712         if (dir == NULL) {
1713                 info(udev, "unable to open '%s': %m\n", dirname);
1714                 return -1;
1715         }
1716
1717         for (;;) {
1718                 struct dirent *dent;
1719
1720                 dent = readdir(dir);
1721                 if (dent == NULL || dent->d_name[0] == '\0')
1722                         break;
1723
1724                 if (dent->d_name[0] == '.')
1725                         continue;
1726
1727                 /* look for file matching with specified suffix */
1728                 if (suffix != NULL) {
1729                         const char *ext;
1730
1731                         ext = strrchr(dent->d_name, '.');
1732                         if (ext == NULL)
1733                                 continue;
1734                         if (strcmp(ext, suffix) != 0)
1735                                 continue;
1736                 }
1737                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1738                 dbg(udev, "put file '%s' into list\n", filename);
1739                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1740         }
1741
1742         closedir(dir);
1743         return 0;
1744 }
1745
1746 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1747 {
1748         struct udev_rules *rules;
1749         struct stat statbuf;
1750         struct udev_list_node file_list;
1751         struct udev_list_entry *file_loop, *file_tmp;
1752         struct token end_token;
1753
1754         rules = calloc(1, sizeof(struct udev_rules));
1755         if (rules == NULL)
1756                 return NULL;
1757         rules->udev = udev;
1758         rules->resolve_names = resolve_names;
1759         udev_list_init(&file_list);
1760
1761         /* init token array and string buffer */
1762         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1763         if (rules->tokens == NULL) {
1764                 free(rules);
1765                 return NULL;
1766         }
1767         rules->token_max = PREALLOC_TOKEN;
1768
1769         rules->buf = malloc(PREALLOC_STRBUF);
1770         if (rules->buf == NULL) {
1771                 free(rules->tokens);
1772                 free(rules);
1773                 return NULL;
1774         }
1775         rules->buf_max = PREALLOC_STRBUF;
1776         /* offset 0 is always '\0' */
1777         rules->buf[0] = '\0';
1778         rules->buf_cur = 1;
1779         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1780             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1781
1782         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1783         if (rules->trie_nodes == NULL) {
1784                 free(rules->buf);
1785                 free(rules->tokens);
1786                 free(rules);
1787                 return NULL;
1788         }
1789         rules->trie_nodes_max = PREALLOC_TRIE;
1790         /* offset 0 is the trie root, with an empty string */
1791         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1792         rules->trie_nodes_cur = 1;
1793
1794         if (udev_get_rules_path(udev) != NULL) {
1795                 /* custom rules location for testing */
1796                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1797         } else {
1798                 char filename[PATH_MAX];
1799                 struct udev_list_node sort_list;
1800                 struct udev_list_entry *sort_loop, *sort_tmp;
1801
1802                 /* read user/custom rules */
1803                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1804
1805                 /* read dynamic/temporary rules */
1806                 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1807                 udev_list_init(&sort_list);
1808                 add_matching_files(udev, &sort_list, filename, ".rules");
1809
1810                 /* read default rules */
1811                 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1812
1813                 /* sort all rules files by basename into list of files */
1814                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1815                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1816                         const char *sort_base = strrchr(sort_name, '/');
1817
1818                         if (sort_base == NULL)
1819                                 continue;
1820                         /* sort entry into existing list */
1821                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1822                                 const char *file_name = udev_list_entry_get_name(file_loop);
1823                                 const char *file_base = strrchr(file_name, '/');
1824
1825                                 if (file_base == NULL)
1826                                         continue;
1827                                 if (strcmp(file_base, sort_base) == 0) {
1828                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1829                                              file_name, sort_name);
1830                                         udev_list_entry_delete(sort_loop);
1831                                         sort_loop = NULL;
1832                                         break;
1833                                 }
1834                                 if (strcmp(file_base, sort_base) > 0) {
1835                                         /* found later file, insert before */
1836                                         udev_list_entry_remove(sort_loop);
1837                                         udev_list_entry_insert_before(sort_loop, file_loop);
1838                                         sort_loop = NULL;
1839                                         break;
1840                                 }
1841                         }
1842                         /* current file already handled */
1843                         if (sort_loop == NULL)
1844                                 continue;
1845                         /* no later file, append to end of list */
1846                         udev_list_entry_remove(sort_loop);
1847                         udev_list_entry_append(sort_loop, &file_list);
1848                 }
1849         }
1850
1851         /* add all filenames to the string buffer */
1852         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1853                 const char *filename = udev_list_entry_get_name(file_loop);
1854                 unsigned int filename_off;
1855
1856                 filename_off = add_string(rules, filename);
1857                 /* the offset in the rule is limited to unsigned short */
1858                 if (filename_off < USHRT_MAX)
1859                         udev_list_entry_set_flags(file_loop, filename_off);
1860         }
1861
1862         /* parse list of files */
1863         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1864                 const char *filename = udev_list_entry_get_name(file_loop);
1865                 unsigned int filename_off = udev_list_entry_get_flags(file_loop);
1866
1867                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1868                         parse_file(rules, filename, filename_off);
1869                 else
1870                         err(udev, "can not read '%s'\n", filename);
1871                 udev_list_entry_delete(file_loop);
1872         }
1873
1874         memset(&end_token, 0x00, sizeof(struct token));
1875         end_token.type = TK_END;
1876         add_token(rules, &end_token);
1877
1878         /* shrink allocated token and string buffer */
1879         if (rules->token_cur < rules->token_max) {
1880                 struct token *tokens;
1881
1882                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1883                 if (tokens != NULL || rules->token_cur == 0) {
1884                         rules->tokens = tokens;
1885                         rules->token_max = rules->token_cur;
1886                 }
1887         }
1888         if (rules->buf_cur < rules->buf_max) {
1889                 char *buf;
1890
1891                 buf = realloc(rules->buf, rules->buf_cur);
1892                 if (buf != NULL || rules->buf_cur == 0) {
1893                         rules->buf = buf;
1894                         rules->buf_max = rules->buf_cur;
1895                 }
1896         }
1897         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1898              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1899         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1900              rules->trie_nodes_cur * sizeof(struct trie_node),
1901              rules->trie_nodes_cur, sizeof(struct trie_node));
1902
1903         /* cleanup trie */
1904         free(rules->trie_nodes);
1905         rules->trie_nodes = NULL;
1906         rules->trie_nodes_cur = 0;
1907         rules->trie_nodes_max = 0;
1908
1909         /* cleanup uid/gid cache */
1910         free(rules->uids);
1911         rules->uids = NULL;
1912         rules->uids_cur = 0;
1913         rules->uids_max = 0;
1914         free(rules->gids);
1915         rules->gids = NULL;
1916         rules->gids_cur = 0;
1917         rules->gids_max = 0;
1918
1919         dump_rules(rules);
1920         return rules;
1921 }
1922
1923 void udev_rules_unref(struct udev_rules *rules)
1924 {
1925         if (rules == NULL)
1926                 return;
1927         free(rules->tokens);
1928         free(rules->buf);
1929         free(rules->trie_nodes);
1930         free(rules->uids);
1931         free(rules->gids);
1932         free(rules);
1933 }
1934
1935 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1936 {
1937         char *key_value = &rules->buf[token->key.value_off];
1938         char *pos;
1939         bool match = false;
1940
1941         if (val == NULL)
1942                 val = "";
1943
1944         switch (token->key.glob) {
1945         case GL_PLAIN:
1946                 match = (strcmp(key_value, val) == 0);
1947                 break;
1948         case GL_GLOB:
1949                 match = (fnmatch(key_value, val, 0) == 0);
1950                 break;
1951         case GL_SPLIT:
1952                 {
1953                         const char *split;
1954                         size_t len;
1955
1956                         split = &rules->buf[token->key.value_off];
1957                         len = strlen(val);
1958                         for (;;) {
1959                                 const char *next;
1960
1961                                 next = strchr(split, '|');
1962                                 if (next != NULL) {
1963                                         size_t matchlen = (size_t)(next - split);
1964
1965                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1966                                         if (match)
1967                                                 break;
1968                                 } else {
1969                                         match = (strcmp(split, val) == 0);
1970                                         break;
1971                                 }
1972                                 split = &next[1];
1973                         }
1974                         break;
1975                 }
1976         case GL_SPLIT_GLOB:
1977                 {
1978                         char value[UTIL_PATH_SIZE];
1979
1980                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1981                         key_value = value;
1982                         while (key_value != NULL) {
1983                                 pos = strchr(key_value, '|');
1984                                 if (pos != NULL) {
1985                                         pos[0] = '\0';
1986                                         pos = &pos[1];
1987                                 }
1988                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1989                                 match = (fnmatch(key_value, val, 0) == 0);
1990                                 if (match)
1991                                         break;
1992                                 key_value = pos;
1993                         }
1994                         break;
1995                 }
1996         case GL_SOMETHING:
1997                 match = (val[0] != '\0');
1998                 break;
1999         case GL_UNSET:
2000                 return -1;
2001         }
2002
2003         if (match && (token->key.op == OP_MATCH)) {
2004                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
2005                 return 0;
2006         }
2007         if (!match && (token->key.op == OP_NOMATCH)) {
2008                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
2009                 return 0;
2010         }
2011         dbg(rules->udev, "%s is not true\n", token_str(token->type));
2012         return -1;
2013 }
2014
2015 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
2016 {
2017         const char *name;
2018         char nbuf[UTIL_NAME_SIZE];
2019         const char *value;
2020         char vbuf[UTIL_NAME_SIZE];
2021         size_t len;
2022
2023         name = &rules->buf[cur->key.attr_off];
2024         switch (cur->key.attrsubst) {
2025         case SB_FORMAT:
2026                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
2027                 name = nbuf;
2028                 /* fall through */
2029         case SB_NONE:
2030                 value = udev_device_get_sysattr_value(dev, name);
2031                 if (value == NULL)
2032                         return -1;
2033                 break;
2034         case SB_SUBSYS:
2035                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
2036                         return -1;
2037                 value = vbuf;
2038                 break;
2039         default:
2040                 return -1;
2041         }
2042
2043         /* remove trailing whitespace, if not asked to match for it */
2044         len = strlen(value);
2045         if (len > 0 && isspace(value[len-1])) {
2046                 const char *key_value;
2047                 size_t klen;
2048
2049                 key_value = &rules->buf[cur->key.value_off];
2050                 klen = strlen(key_value);
2051                 if (klen > 0 && !isspace(key_value[klen-1])) {
2052                         if (value != vbuf) {
2053                                 util_strscpy(vbuf, sizeof(vbuf), value);
2054                                 value = vbuf;
2055                         }
2056                         while (len > 0 && isspace(vbuf[--len]))
2057                                 vbuf[len] = '\0';
2058                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
2059                 }
2060         }
2061
2062         return match_key(rules, cur, value);
2063 }
2064
2065 enum escape_type {
2066         ESCAPE_UNSET,
2067         ESCAPE_NONE,
2068         ESCAPE_REPLACE,
2069 };
2070
2071 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2072 {
2073         struct token *cur;
2074         struct token *rule;
2075         enum escape_type esc = ESCAPE_UNSET;
2076         bool can_set_name;
2077
2078         if (rules->tokens == NULL)
2079                 return -1;
2080
2081         can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&
2082                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2083                          udev_device_get_ifindex(event->dev) > 0));
2084
2085         /* loop through token list, match, run actions or forward to next rule */
2086         cur = &rules->tokens[0];
2087         rule = cur;
2088         for (;;) {
2089                 dump_token(rules, cur);
2090                 switch (cur->type) {
2091                 case TK_RULE:
2092                         /* current rule */
2093                         rule = cur;
2094                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2095                         if (!can_set_name && rule->rule.can_set_name)
2096                                 goto nomatch;
2097                         esc = ESCAPE_UNSET;
2098                         break;
2099                 case TK_M_ACTION:
2100                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2101                                 goto nomatch;
2102                         break;
2103                 case TK_M_DEVPATH:
2104                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2105                                 goto nomatch;
2106                         break;
2107                 case TK_M_KERNEL:
2108                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2109                                 goto nomatch;
2110                         break;
2111                 case TK_M_DEVLINK:
2112                         {
2113                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2114                                 struct udev_list_entry *list_entry;
2115                                 bool match = false;
2116
2117                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2118                                         const char *devlink;
2119
2120                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2121                                         if (match_key(rules, cur, devlink) == 0) {
2122                                                 match = true;
2123                                                 break;
2124                                         }
2125                                 }
2126                                 if (!match)
2127                                         goto nomatch;
2128                                 break;
2129                         }
2130                 case TK_M_NAME:
2131                         if (match_key(rules, cur, event->name) != 0)
2132                                 goto nomatch;
2133                         break;
2134                 case TK_M_ENV:
2135                         {
2136                                 const char *key_name = &rules->buf[cur->key.attr_off];
2137                                 const char *value;
2138
2139                                 value = udev_device_get_property_value(event->dev, key_name);
2140                                 if (value == NULL) {
2141                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2142                                         value = "";
2143                                 }
2144                                 if (match_key(rules, cur, value))
2145                                         goto nomatch;
2146                                 break;
2147                         }
2148                 case TK_M_TAG:
2149                         {
2150                                 struct udev_list_entry *list_entry;
2151                                 bool match = false;
2152
2153                                 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
2154                                         if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {
2155                                                 match = true;
2156                                                 break;
2157                                         }
2158                                 }
2159                                 if (!match && (cur->key.op != OP_NOMATCH))
2160                                         goto nomatch;
2161                                 break;
2162                         }
2163                 case TK_M_SUBSYSTEM:
2164                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2165                                 goto nomatch;
2166                         break;
2167                 case TK_M_DRIVER:
2168                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2169                                 goto nomatch;
2170                         break;
2171                 case TK_M_WAITFOR:
2172                         {
2173                                 char filename[UTIL_PATH_SIZE];
2174                                 int found;
2175
2176                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2177                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2178                                 if (!found && (cur->key.op != OP_NOMATCH))
2179                                         goto nomatch;
2180                                 break;
2181                         }
2182                 case TK_M_ATTR:
2183                         if (match_attr(rules, event->dev, event, cur) != 0)
2184                                 goto nomatch;
2185                         break;
2186                 case TK_M_KERNELS:
2187                 case TK_M_SUBSYSTEMS:
2188                 case TK_M_DRIVERS:
2189                 case TK_M_ATTRS:
2190                         {
2191                                 struct token *next;
2192
2193                                 /* get whole sequence of parent matches */
2194                                 next = cur;
2195                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2196                                         next++;
2197
2198                                 /* loop over parents */
2199                                 event->dev_parent = event->dev;
2200                                 for (;;) {
2201                                         struct token *key;
2202
2203                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2204                                         /* loop over sequence of parent match keys */
2205                                         for (key = cur; key < next; key++ ) {
2206                                                 dump_token(rules, key);
2207                                                 switch(key->type) {
2208                                                 case TK_M_KERNELS:
2209                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2210                                                                 goto try_parent;
2211                                                         break;
2212                                                 case TK_M_SUBSYSTEMS:
2213                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2214                                                                 goto try_parent;
2215                                                         break;
2216                                                 case TK_M_DRIVERS:
2217                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2218                                                                 goto try_parent;
2219                                                         break;
2220                                                 case TK_M_ATTRS:
2221                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2222                                                                 goto try_parent;
2223                                                         break;
2224                                                 default:
2225                                                         goto nomatch;
2226                                                 }
2227                                                 dbg(event->udev, "parent key matched\n");
2228                                         }
2229                                         dbg(event->udev, "all parent keys matched\n");
2230                                         /* all keys matched */
2231                                         break;
2232
2233                                 try_parent:
2234                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2235                                         if (event->dev_parent == NULL)
2236                                                 goto nomatch;
2237                                 }
2238                                 /* move behind our sequence of parent match keys */
2239                                 cur = next;
2240                                 continue;
2241                         }
2242                 case TK_M_TEST:
2243                         {
2244                                 char filename[UTIL_PATH_SIZE];
2245                                 struct stat statbuf;
2246                                 int match;
2247
2248                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2249                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2250                                         if (filename[0] != '/') {
2251                                                 char tmp[UTIL_PATH_SIZE];
2252
2253                                                 util_strscpy(tmp, sizeof(tmp), filename);
2254                                                 util_strscpyl(filename, sizeof(filename),
2255                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2256                                         }
2257                                 }
2258                                 attr_subst_subdir(filename, sizeof(filename));
2259
2260                                 match = (stat(filename, &statbuf) == 0);
2261                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2262                                 if (match && cur->key.mode > 0) {
2263                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2264                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2265                                             match ? "matches" : "does not match", cur->key.mode);
2266                                 }
2267                                 if (match && cur->key.op == OP_NOMATCH)
2268                                         goto nomatch;
2269                                 if (!match && cur->key.op == OP_MATCH)
2270                                         goto nomatch;
2271                                 break;
2272                         }
2273                 case TK_M_PROGRAM:
2274                         {
2275                                 char program[UTIL_PATH_SIZE];
2276                                 char **envp;
2277                                 char result[UTIL_PATH_SIZE];
2278
2279                                 free(event->program_result);
2280                                 event->program_result = NULL;
2281                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2282                                 envp = udev_device_get_properties_envp(event->dev);
2283                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2284                                      program,
2285                                      &rules->buf[rule->rule.filename_off],
2286                                      rule->rule.filename_line);
2287                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL, false) != 0) {
2288                                         if (cur->key.op != OP_NOMATCH)
2289                                                 goto nomatch;
2290                                 } else {
2291                                         int count;
2292
2293                                         util_remove_trailing_chars(result, '\n');
2294                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2295                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2296                                                 if (count > 0)
2297                                                         info(event->udev, "%i character(s) replaced\n" , count);
2298                                         }
2299                                         event->program_result = strdup(result);
2300                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2301                                         if (cur->key.op == OP_NOMATCH)
2302                                                 goto nomatch;
2303                                 }
2304                                 break;
2305                         }
2306                 case TK_M_IMPORT_FILE:
2307                         {
2308                                 char import[UTIL_PATH_SIZE];
2309
2310                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2311                                 if (import_file_into_properties(event->dev, import) != 0)
2312                                         if (cur->key.op != OP_NOMATCH)
2313                                                 goto nomatch;
2314                                 break;
2315                         }
2316                 case TK_M_IMPORT_PROG:
2317                         {
2318                                 char import[UTIL_PATH_SIZE];
2319
2320                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2321                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2322                                      import,
2323                                      &rules->buf[rule->rule.filename_off],
2324                                      rule->rule.filename_line);
2325                                 if (import_program_into_properties(event->dev, import) != 0)
2326                                         if (cur->key.op != OP_NOMATCH)
2327                                                 goto nomatch;
2328                                 break;
2329                         }
2330                 case TK_M_IMPORT_DB:
2331                         {
2332                                 const char *key = &rules->buf[cur->key.value_off];
2333                                 const char *value;
2334
2335                                 value = udev_device_get_property_value(event->dev_db, key);
2336                                 if (value != NULL) {
2337                                         struct udev_list_entry *entry;
2338
2339                                         entry = udev_device_add_property(event->dev, key, value);
2340                                         udev_list_entry_set_flags(entry, 1);
2341                                 } else {
2342                                         if (cur->key.op != OP_NOMATCH)
2343                                                 goto nomatch;
2344                                 }
2345                                 break;
2346                         }
2347                 case TK_M_IMPORT_CMDLINE:
2348                         {
2349                                 FILE *f;
2350                                 bool imported = false;
2351
2352                                 f = fopen("/proc/cmdline", "r");
2353                                 if (f != NULL) {
2354                                         char cmdline[4096];
2355
2356                                         if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2357                                                 const char *key = &rules->buf[cur->key.value_off];
2358                                                 char *pos;
2359
2360                                                 pos = strstr(cmdline, key);
2361                                                 if (pos != NULL) {
2362                                                         struct udev_list_entry *entry;
2363
2364                                                         pos += strlen(key);
2365                                                         if (pos[0] == '\0' || isspace(pos[0])) {
2366                                                                 /* we import simple flags as 'FLAG=1' */
2367                                                                 entry = udev_device_add_property(event->dev, key, "1");
2368                                                                 udev_list_entry_set_flags(entry, 1);
2369                                                                 imported = true;
2370                                                         } else if (pos[0] == '=') {
2371                                                                 const char *value;
2372
2373                                                                 pos++;
2374                                                                 value = pos;
2375                                                                 while (pos[0] != '\0' && !isspace(pos[0]))
2376                                                                         pos++;
2377                                                                 pos[0] = '\0';
2378                                                                 entry = udev_device_add_property(event->dev, key, value);
2379                                                                 udev_list_entry_set_flags(entry, 1);
2380                                                                 imported = true;
2381                                                         }
2382                                                 }
2383                                         }
2384                                         fclose(f);
2385                                 }
2386                                 if (!imported && cur->key.op != OP_NOMATCH)
2387                                         goto nomatch;
2388                                 break;
2389                         }
2390                 case TK_M_IMPORT_PARENT:
2391                         {
2392                                 char import[UTIL_PATH_SIZE];
2393
2394                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2395                                 if (import_parent_into_properties(event->dev, import) != 0)
2396                                         if (cur->key.op != OP_NOMATCH)
2397                                                 goto nomatch;
2398                                 break;
2399                         }
2400                 case TK_M_RESULT:
2401                         if (match_key(rules, cur, event->program_result) != 0)
2402                                 goto nomatch;
2403                         break;
2404                 case TK_A_STRING_ESCAPE_NONE:
2405                         esc = ESCAPE_NONE;
2406                         break;
2407                 case TK_A_STRING_ESCAPE_REPLACE:
2408                         esc = ESCAPE_REPLACE;
2409                         break;
2410                 case TK_A_INOTIFY_WATCH:
2411                         if (event->inotify_watch_final)
2412                                 break;
2413                         if (cur->key.op == OP_ASSIGN_FINAL)
2414                                 event->inotify_watch_final = true;
2415                         event->inotify_watch = cur->key.watch;
2416                         break;
2417                 case TK_A_DEVLINK_PRIO:
2418                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2419                         break;
2420                 case TK_A_OWNER:
2421                         {
2422                                 char owner[UTIL_NAME_SIZE];
2423
2424                                 if (event->owner_final)
2425                                         break;
2426                                 if (cur->key.op == OP_ASSIGN_FINAL)
2427                                         event->owner_final = true;
2428                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2429                                 event->uid = util_lookup_user(event->udev, owner);
2430                                 info(event->udev, "OWNER %u %s:%u\n",
2431                                      event->uid,
2432                                      &rules->buf[rule->rule.filename_off],
2433                                      rule->rule.filename_line);
2434                                 break;
2435                         }
2436                 case TK_A_GROUP:
2437                         {
2438                                 char group[UTIL_NAME_SIZE];
2439
2440                                 if (event->group_final)
2441                                         break;
2442                                 if (cur->key.op == OP_ASSIGN_FINAL)
2443                                         event->group_final = true;
2444                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2445                                 event->gid = util_lookup_group(event->udev, group);
2446                                 info(event->udev, "GROUP %u %s:%u\n",
2447                                      event->gid,
2448                                      &rules->buf[rule->rule.filename_off],
2449                                      rule->rule.filename_line);
2450                                 break;
2451                         }
2452                 case TK_A_MODE:
2453                         {
2454                                 char mode[UTIL_NAME_SIZE];
2455                                 char *endptr;
2456
2457                                 if (event->mode_final)
2458                                         break;
2459                                 if (cur->key.op == OP_ASSIGN_FINAL)
2460                                         event->mode_final = true;
2461                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2462                                 event->mode = strtol(mode, &endptr, 8);
2463                                 if (endptr[0] != '\0') {
2464                                         err(event->udev, "invalide mode '%s' set default mode 0600\n", mode);
2465                                         event->mode = 0600;
2466                                 }
2467                                 info(event->udev, "MODE %#o %s:%u\n",
2468                                      event->mode,
2469                                      &rules->buf[rule->rule.filename_off],
2470                                      rule->rule.filename_line);
2471                                 break;
2472                         }
2473                 case TK_A_OWNER_ID:
2474                         if (event->owner_final)
2475                                 break;
2476                         if (cur->key.op == OP_ASSIGN_FINAL)
2477                                 event->owner_final = true;
2478                         event->uid = cur->key.uid;
2479                         info(event->udev, "OWNER %u %s:%u\n",
2480                              event->uid,
2481                              &rules->buf[rule->rule.filename_off],
2482                              rule->rule.filename_line);
2483                         break;
2484                 case TK_A_GROUP_ID:
2485                         if (event->group_final)
2486                                 break;
2487                         if (cur->key.op == OP_ASSIGN_FINAL)
2488                                 event->group_final = true;
2489                         event->gid = cur->key.gid;
2490                         info(event->udev, "GROUP %u %s:%u\n",
2491                              event->gid,
2492                              &rules->buf[rule->rule.filename_off],
2493                              rule->rule.filename_line);
2494                         break;
2495                 case TK_A_MODE_ID:
2496                         if (event->mode_final)
2497                                 break;
2498                         if (cur->key.op == OP_ASSIGN_FINAL)
2499                                 event->mode_final = true;
2500                         event->mode = cur->key.mode;
2501                         info(event->udev, "MODE %#o %s:%u\n",
2502                              event->mode,
2503                              &rules->buf[rule->rule.filename_off],
2504                              rule->rule.filename_line);
2505                         break;
2506                 case TK_A_STATIC_NODE:
2507                         break;
2508                 case TK_A_ENV:
2509                         {
2510                                 const char *name = &rules->buf[cur->key.attr_off];
2511                                 char *value = &rules->buf[cur->key.value_off];
2512
2513                                 if (value[0] != '\0') {
2514                                         char temp_value[UTIL_NAME_SIZE];
2515                                         struct udev_list_entry *entry;
2516
2517                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2518                                         entry = udev_device_add_property(event->dev, name, temp_value);
2519                                         /* store in db, skip private keys */
2520                                         if (name[0] != '.')
2521                                                 udev_list_entry_set_flags(entry, 1);
2522                                 } else {
2523                                         udev_device_add_property(event->dev, name, NULL);
2524                                 }
2525                                 break;
2526                         }
2527                 case TK_A_TAG:
2528                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2529                                 udev_device_cleanup_tags_list(event->dev);
2530                         udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
2531                         break;
2532                 case TK_A_NAME:
2533                         {
2534                                 const char *name  = &rules->buf[cur->key.value_off];
2535                                 char name_str[UTIL_PATH_SIZE];
2536                                 int count;
2537
2538                                 if (event->name_final)
2539                                         break;
2540                                 if (cur->key.op == OP_ASSIGN_FINAL)
2541                                         event->name_final = true;
2542                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2543                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2544                                         count = udev_util_replace_chars(name_str, "/");
2545                                         if (count > 0)
2546                                                 info(event->udev, "%i character(s) replaced\n", count);
2547                                 }
2548                                 free(event->name);
2549                                 event->name = strdup(name_str);
2550                                 info(event->udev, "NAME '%s' %s:%u\n",
2551                                      event->name,
2552                                      &rules->buf[rule->rule.filename_off],
2553                                      rule->rule.filename_line);
2554                                 break;
2555                         }
2556                 case TK_A_DEVLINK:
2557                         {
2558                                 char temp[UTIL_PATH_SIZE];
2559                                 char filename[UTIL_PATH_SIZE];
2560                                 char *pos, *next;
2561                                 int count = 0;
2562
2563                                 if (event->devlink_final)
2564                                         break;
2565                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2566                                         break;
2567                                 if (cur->key.op == OP_ASSIGN_FINAL)
2568                                         event->devlink_final = true;
2569                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2570                                         udev_device_cleanup_devlinks_list(event->dev);
2571
2572                                 /* allow  multiple symlinks separated by spaces */
2573                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2574                                 if (esc == ESCAPE_UNSET)
2575                                         count = udev_util_replace_chars(temp, "/ ");
2576                                 else if (esc == ESCAPE_REPLACE)
2577                                         count = udev_util_replace_chars(temp, "/");
2578                                 if (count > 0)
2579                                         info(event->udev, "%i character(s) replaced\n" , count);
2580                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2581                                 pos = temp;
2582                                 while (isspace(pos[0]))
2583                                         pos++;
2584                                 next = strchr(pos, ' ');
2585                                 while (next != NULL) {
2586                                         next[0] = '\0';
2587                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2588                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2589                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2590                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2591                                         while (isspace(next[1]))
2592                                                 next++;
2593                                         pos = &next[1];
2594                                         next = strchr(pos, ' ');
2595                                 }
2596                                 if (pos[0] != '\0') {
2597                                         info(event->udev, "LINK '%s' %s:%u\n", pos,
2598                                              &rules->buf[rule->rule.filename_off], rule->rule.filename_line);
2599                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2600                                         udev_device_add_devlink(event->dev, filename, cur->key.devlink_unique);
2601                                 }
2602                         }
2603                         break;
2604                 case TK_A_EVENT_TIMEOUT:
2605                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2606                         break;
2607                 case TK_A_ATTR:
2608                         {
2609                                 const char *key_name = &rules->buf[cur->key.attr_off];
2610                                 char attr[UTIL_PATH_SIZE];
2611                                 char value[UTIL_NAME_SIZE];
2612                                 FILE *f;
2613
2614                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2615                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2616                                 attr_subst_subdir(attr, sizeof(attr));
2617
2618                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2619                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2620                                      &rules->buf[rule->rule.filename_off],
2621                                      rule->rule.filename_line);
2622                                 f = fopen(attr, "w");
2623                                 if (f != NULL) {
2624                                         if (fprintf(f, "%s", value) <= 0)
2625                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2626                                         fclose(f);
2627                                 } else {
2628                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2629                                 }
2630                                 break;
2631                         }
2632                 case TK_A_RUN:
2633                         {
2634                                 struct udev_list_entry *list_entry;
2635
2636                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2637                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2638                                 info(event->udev, "RUN '%s' %s:%u\n",
2639                                      &rules->buf[cur->key.value_off],
2640                                      &rules->buf[rule->rule.filename_off],
2641                                      rule->rule.filename_line);
2642                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2643                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2644                                 if (cur->key.fail_on_error)
2645                                         udev_list_entry_set_flags(list_entry, 1);
2646                                 break;
2647                         }
2648                 case TK_A_GOTO:
2649                         if (cur->key.rule_goto == 0)
2650                                 break;
2651                         cur = &rules->tokens[cur->key.rule_goto];
2652                         continue;
2653                 case TK_END:
2654                         return 0;
2655
2656                 case TK_M_PARENTS_MIN:
2657                 case TK_M_PARENTS_MAX:
2658                 case TK_M_MAX:
2659                 case TK_UNSET:
2660                         err(rules->udev, "wrong type %u\n", cur->type);
2661                         goto nomatch;
2662                 }
2663
2664                 cur++;
2665                 continue;
2666         nomatch:
2667                 /* fast-forward to next rule */
2668                 cur = rule + rule->rule.token_count;
2669                 dbg(rules->udev, "forward to rule: %u\n",
2670                                  (unsigned int) (cur - rules->tokens));
2671         }
2672 }
2673
2674 void udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2675 {
2676         struct token *cur;
2677         struct token *rule;
2678         uid_t uid = 0;
2679         gid_t gid = 0;
2680         mode_t mode = 0;
2681
2682         if (rules->tokens == NULL)
2683                 return;
2684
2685         cur = &rules->tokens[0];
2686         rule = cur;
2687         for (;;) {
2688                 switch (cur->type) {
2689                 case TK_RULE:
2690                         /* current rule */
2691                         rule = cur;
2692
2693                         /* skip rules without a static_node tag */
2694                         if (!rule->rule.has_static_node)
2695                                 goto next;
2696
2697                         uid = 0;
2698                         gid = 0;
2699                         mode = 0;
2700                         break;
2701                 case TK_A_OWNER_ID:
2702                         uid = cur->key.uid;
2703                         break;
2704                 case TK_A_GROUP_ID:
2705                         gid = cur->key.gid;
2706                         break;
2707                 case TK_A_MODE_ID:
2708                         mode = cur->key.mode;
2709                         break;
2710                 case TK_A_STATIC_NODE: {
2711                         char filename[UTIL_PATH_SIZE];
2712                         struct stat stats;
2713                         /* we assure, that the permissions tokens are sorted before the static token */
2714                         if (mode == 0 && uid == 0 && gid == 0)
2715                                 goto next;
2716                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(rules->udev), "/",
2717                                       &rules->buf[cur->key.value_off], NULL);
2718                         if (stat(filename, &stats) != 0)
2719                                 goto next;
2720                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2721                                 goto next;
2722                         if (mode != 0 && mode != (stats.st_mode & 0777)) {
2723                                 chmod(filename, mode);
2724                                 info(rules->udev, "chmod '%s' %#o\n", filename, mode);
2725                         }
2726                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2727                                 chown(filename, uid, gid);
2728                                 info(rules->udev, "chown '%s' %u %u\n", filename, uid, gid);
2729                         }
2730                         utimensat(AT_FDCWD, filename, NULL, 0);
2731                         break;
2732                 }
2733                 case TK_END:
2734                         return;
2735                 }
2736
2737                 cur++;
2738                 continue;
2739 next:
2740                 /* fast-forward to next rule */
2741                 cur = rule + rule->rule.token_count;
2742                 continue;
2743         }
2744 }