udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2009 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 <string.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <dirent.h>
  29 #include <fnmatch.h>
  30 #include <time.h>
  31
  32 #include "udev.h"
  33
  34 #define PREALLOC_TOKEN                  2048
  35 #define PREALLOC_STRBUF                 32 * 1024
  36 #define PREALLOC_TRIE                   256
  37
  38 struct uid_gid {
  39         unsigned int name_off;
  40         union {
  41                 uid_t   uid;
  42                 gid_t   gid;
  43         };
  44 };
  45
  46 struct trie_node {
  47         /* this node's first child */
  48         unsigned int child_idx;
  49         /* the next child of our parent node's child list */
  50         unsigned int next_child_idx;
  51         /* this node's last child (shortcut for append) */
  52         unsigned int last_child_idx;
  53         unsigned int value_off;
  54         unsigned short value_len;
  55         unsigned char key;
  56 };
  57
  58 struct udev_rules {
  59         struct udev *udev;
  60         int resolve_names;
  61
  62         /* every key in the rules file becomes a token */
  63         struct token *tokens;
  64         unsigned int token_cur;
  65         unsigned int token_max;
  66
  67         /* all key strings are copied to a single string buffer */
  68         char *buf;
  69         size_t buf_cur;
  70         size_t buf_max;
  71         unsigned int buf_count;
  72
  73         /* during rule parsing, strings are indexed to find duplicates */
  74         struct trie_node *trie_nodes;
  75         unsigned int trie_nodes_cur;
  76         unsigned int trie_nodes_max;
  77
  78         /* during rule parsing, uid/gid lookup results are cached */
  79         struct uid_gid *uids;
  80         unsigned int uids_cur;
  81         unsigned int uids_max;
  82         struct uid_gid *gids;
  83         unsigned int gids_cur;
  84         unsigned int gids_max;
  85 };
  86
  87 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  88 enum operation_type {
  89         OP_UNSET,
  90
  91         OP_MATCH,
  92         OP_NOMATCH,
  93         OP_MATCH_MAX,
  94
  95         OP_ADD,
  96         OP_ASSIGN,
  97         OP_ASSIGN_FINAL,
  98 };
  99
 100 enum string_glob_type {
 101         GL_UNSET,
 102         GL_PLAIN,                       /* no special chars */
 103         GL_GLOB,                        /* shell globs ?,*,[] */
 104         GL_SPLIT,                       /* multi-value A|B */
 105         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
 106         GL_SOMETHING,                   /* commonly used "?*" */
 107 };
 108
 109 enum string_subst_type {
 110         SB_UNSET,
 111         SB_NONE,
 112         SB_FORMAT,
 113         SB_SUBSYS,
 114 };
 115
 116 /* tokens of a rule are sorted/handled in this order */
 117 enum token_type {
 118         TK_UNSET,
 119         TK_RULE,
 120
 121         TK_M_ACTION,                    /* val */
 122         TK_M_DEVPATH,                   /* val */
 123         TK_M_KERNEL,                    /* val */
 124         TK_M_DEVLINK,                   /* val */
 125         TK_M_NAME,                      /* val */
 126         TK_M_ENV,                       /* val, attr */
 127         TK_M_SUBSYSTEM,                 /* val */
 128         TK_M_DRIVER,                    /* val */
 129         TK_M_WAITFOR,                   /* val */
 130         TK_M_ATTR,                      /* val, attr */
 131
 132         TK_M_PARENTS_MIN,
 133         TK_M_KERNELS,                   /* val */
 134         TK_M_SUBSYSTEMS,                /* val */
 135         TK_M_DRIVERS,                   /* val */
 136         TK_M_ATTRS,                     /* val, attr */
 137         TK_M_PARENTS_MAX,
 138
 139         TK_M_TEST,                      /* val, mode_t */
 140         TK_M_PROGRAM,                   /* val */
 141         TK_M_IMPORT_FILE,               /* val */
 142         TK_M_IMPORT_PROG,               /* val */
 143         TK_M_IMPORT_PARENT,             /* val */
 144         TK_M_RESULT,                    /* val */
 145         TK_M_MAX,
 146
 147         TK_A_IGNORE_DEVICE,
 148         TK_A_STRING_ESCAPE_NONE,
 149         TK_A_STRING_ESCAPE_REPLACE,
 150         TK_A_INOTIFY_WATCH,             /* int */
 151         TK_A_NUM_FAKE_PART,             /* int */
 152         TK_A_DEVLINK_PRIO,              /* int */
 153         TK_A_OWNER,                     /* val */
 154         TK_A_GROUP,                     /* val */
 155         TK_A_MODE,                      /* val */
 156         TK_A_OWNER_ID,                  /* uid_t */
 157         TK_A_GROUP_ID,                  /* gid_t */
 158         TK_A_MODE_ID,                   /* mode_t */
 159         TK_A_ENV,                       /* val, attr */
 160         TK_A_NAME,                      /* val */
 161         TK_A_DEVLINK,                   /* val */
 162         TK_A_EVENT_TIMEOUT,             /* int */
 163         TK_A_IGNORE_REMOVE,
 164         TK_A_ATTR,                      /* val, attr */
 165         TK_A_RUN,                       /* val, bool */
 166         TK_A_GOTO,                      /* size_t */
 167         TK_A_LAST_RULE,
 168
 169         TK_END,
 170 };
 171
 172 /* we try to pack stuff in a way that we take only 12 bytes per token */
 173 struct token {
 174         union {
 175                 unsigned char type;             /* same as in rule and key */
 176                 struct {
 177                         enum token_type type:8;
 178                         unsigned int flags:8;
 179                         unsigned short token_count;
 180                         unsigned int label_off;
 181                         unsigned short filename_off;
 182                         unsigned short filename_line;
 183                 } rule;
 184                 struct {
 185                         enum token_type type:8;
 186                         enum operation_type op:8;
 187                         enum string_glob_type glob:8;
 188                         enum string_subst_type subst:4;
 189                         enum string_subst_type attrsubst:4;
 190                         unsigned int value_off;
 191                         union {
 192                                 unsigned int attr_off;
 193                                 int ignore_error;
 194                                 unsigned int rule_goto;
 195                                 mode_t  mode;
 196                                 uid_t uid;
 197                                 gid_t gid;
 198                                 int num_fake_part;
 199                                 int devlink_prio;
 200                                 int event_timeout;
 201                                 int watch;
 202                         };
 203                 } key;
 204         };
 205 };
 206
 207 #define MAX_TK          64
 208 struct rule_tmp {
 209         struct udev_rules *rules;
 210         struct token rule;
 211         struct token token[MAX_TK];
 212         unsigned int token_cur;
 213 };
 214
 215 #ifdef ENABLE_DEBUG
 216 static const char *operation_str(enum operation_type type)
 217 {
 218         static const char *operation_strs[] = {
 219                 [OP_UNSET] =            "UNSET",
 220                 [OP_MATCH] =            "match",
 221                 [OP_NOMATCH] =          "nomatch",
 222                 [OP_MATCH_MAX] =        "MATCH_MAX",
 223
 224                 [OP_ADD] =              "add",
 225                 [OP_ASSIGN] =           "assign",
 226                 [OP_ASSIGN_FINAL] =     "assign-final",
 227 }       ;
 228
 229         return operation_strs[type];
 230 }
 231
 232 static const char *string_glob_str(enum string_glob_type type)
 233 {
 234         static const char *string_glob_strs[] = {
 235                 [GL_UNSET] =            "UNSET",
 236                 [GL_PLAIN] =            "plain",
 237                 [GL_GLOB] =             "glob",
 238                 [GL_SPLIT] =            "split",
 239                 [GL_SPLIT_GLOB] =       "split-glob",
 240                 [GL_SOMETHING] =        "split-glob",
 241         };
 242
 243         return string_glob_strs[type];
 244 }
 245
 246 static const char *token_str(enum token_type type)
 247 {
 248         static const char *token_strs[] = {
 249                 [TK_UNSET] =                    "UNSET",
 250                 [TK_RULE] =                     "RULE",
 251
 252                 [TK_M_ACTION] =                 "M ACTION",
 253                 [TK_M_DEVPATH] =                "M DEVPATH",
 254                 [TK_M_KERNEL] =                 "M KERNEL",
 255                 [TK_M_DEVLINK] =                "M DEVLINK",
 256                 [TK_M_NAME] =                   "M NAME",
 257                 [TK_M_ENV] =                    "M ENV",
 258                 [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 259                 [TK_M_DRIVER] =                 "M DRIVER",
 260                 [TK_M_WAITFOR] =                "M WAITFOR",
 261                 [TK_M_ATTR] =                   "M ATTR",
 262
 263                 [TK_M_PARENTS_MIN] =            "M PARENTS_MIN",
 264                 [TK_M_KERNELS] =                "M KERNELS",
 265                 [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 266                 [TK_M_DRIVERS] =                "M DRIVERS",
 267                 [TK_M_ATTRS] =                  "M ATTRS",
 268                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 269
 270                 [TK_M_TEST] =                   "M TEST",
 271                 [TK_M_PROGRAM] =                "M PROGRAM",
 272                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 273                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 274                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 275                 [TK_M_RESULT] =                 "M RESULT",
 276                 [TK_M_MAX] =                    "M MAX",
 277
 278                 [TK_A_IGNORE_DEVICE] =          "A IGNORE_DEVICE",
 279                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 280                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 281                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 282                 [TK_A_NUM_FAKE_PART] =          "A NUM_FAKE_PART",
 283                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 284                 [TK_A_OWNER] =                  "A OWNER",
 285                 [TK_A_GROUP] =                  "A GROUP",
 286                 [TK_A_MODE] =                   "A MODE",
 287                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 288                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 289                 [TK_A_MODE_ID] =                "A MODE_ID",
 290                 [TK_A_ENV] =                    "A ENV",
 291                 [TK_A_NAME] =                   "A NAME",
 292                 [TK_A_DEVLINK] =                "A DEVLINK",
 293                 [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 294                 [TK_A_IGNORE_REMOVE] =          "A IGNORE_REMOVE",
 295                 [TK_A_ATTR] =                   "A ATTR",
 296                 [TK_A_RUN] =                    "A RUN",
 297                 [TK_A_GOTO] =                   "A GOTO",
 298                 [TK_A_LAST_RULE] =              "A LAST_RULE",
 299
 300                 [TK_END] =                      "END",
 301         };
 302
 303         return token_strs[type];
 304 }
 305
 306 static void dump_token(struct udev_rules *rules, struct token *token)
 307 {
 308         enum token_type type = token->type;
 309         enum operation_type op = token->key.op;
 310         enum string_glob_type glob = token->key.glob;
 311         const char *value = &rules->buf[token->key.value_off];
 312         const char *attr = &rules->buf[token->key.attr_off];
 313
 314         switch (type) {
 315         case TK_RULE:
 316                 {
 317                         const char *tks_ptr = (char *)rules->tokens;
 318                         const char *tk_ptr = (char *)token;
 319                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 320
 321                         dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s', flags: 0x%02x\n",
 322                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 323                             idx, token->rule.token_count,
 324                             &rules->buf[token->rule.label_off],
 325                             token->rule.flags);
 326                         break;
 327                 }
 328         case TK_M_ACTION:
 329         case TK_M_DEVPATH:
 330         case TK_M_KERNEL:
 331         case TK_M_SUBSYSTEM:
 332         case TK_M_DRIVER:
 333         case TK_M_WAITFOR:
 334         case TK_M_DEVLINK:
 335         case TK_M_NAME:
 336         case TK_M_KERNELS:
 337         case TK_M_SUBSYSTEMS:
 338         case TK_M_DRIVERS:
 339         case TK_M_PROGRAM:
 340         case TK_M_IMPORT_FILE:
 341         case TK_M_IMPORT_PROG:
 342         case TK_M_IMPORT_PARENT:
 343         case TK_M_RESULT:
 344         case TK_A_NAME:
 345         case TK_A_DEVLINK:
 346         case TK_A_OWNER:
 347         case TK_A_GROUP:
 348         case TK_A_MODE:
 349         case TK_A_RUN:
 350                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 351                     token_str(type), operation_str(op), value, string_glob_str(glob));
 352                 break;
 353         case TK_M_ATTR:
 354         case TK_M_ATTRS:
 355         case TK_M_ENV:
 356         case TK_A_ATTR:
 357         case TK_A_ENV:
 358                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 359                     token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 360                 break;
 361         case TK_A_IGNORE_DEVICE:
 362         case TK_A_STRING_ESCAPE_NONE:
 363         case TK_A_STRING_ESCAPE_REPLACE:
 364         case TK_A_LAST_RULE:
 365         case TK_A_IGNORE_REMOVE:
 366                 dbg(rules->udev, "%s\n", token_str(type));
 367                 break;
 368         case TK_M_TEST:
 369                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 370                     token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 371                 break;
 372         case TK_A_INOTIFY_WATCH:
 373                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);
 374                 break;
 375         case TK_A_NUM_FAKE_PART:
 376                 dbg(rules->udev, "%s %u\n", token_str(type), token->key.num_fake_part);
 377                 break;
 378         case TK_A_DEVLINK_PRIO:
 379                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.devlink_prio);
 380                 break;
 381         case TK_A_OWNER_ID:
 382                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 383                 break;
 384         case TK_A_GROUP_ID:
 385                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 386                 break;
 387         case TK_A_MODE_ID:
 388                 dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 389                 break;
 390         case TK_A_EVENT_TIMEOUT:
 391                 dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.event_timeout);
 392                 break;
 393         case TK_A_GOTO:
 394                 dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 395                 break;
 396         case TK_END:
 397                 dbg(rules->udev, "* %s\n", token_str(type));
 398                 break;
 399         case TK_M_PARENTS_MIN:
 400         case TK_M_PARENTS_MAX:
 401         case TK_M_MAX:
 402         case TK_UNSET:
 403                 dbg(rules->udev, "unknown type %u\n", type);
 404                 break;
 405         }
 406 }
 407
 408 static void dump_rules(struct udev_rules *rules)
 409 {
 410         unsigned int i;
 411
 412         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 413             rules->token_cur,
 414             rules->token_cur * sizeof(struct token),
 415             rules->buf_count,
 416             rules->buf_cur);
 417         for(i = 0; i < rules->token_cur; i++)
 418                 dump_token(rules, &rules->tokens[i]);
 419 }
 420 #else
 421 static inline const char *operation_str(enum operation_type type) { return NULL; }
 422 static inline const char *token_str(enum token_type type) { return NULL; }
 423 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 424 static inline void dump_rules(struct udev_rules *rules) {}
 425 #endif /* ENABLE_DEBUG */
 426
 427 static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)
 428 {
 429         int off;
 430
 431         /* grow buffer if needed */
 432         if (rules->buf_cur + bytes+1 >= rules->buf_max) {
 433                 char *buf;
 434                 unsigned int add;
 435
 436                 /* double the buffer size */
 437                 add = rules->buf_max;
 438                 if (add < bytes * 8)
 439                         add = bytes * 8;
 440
 441                 buf = realloc(rules->buf, rules->buf_max + add);
 442                 if (buf == NULL)
 443                         return -1;
 444                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 445                 rules->buf = buf;
 446                 rules->buf_max += add;
 447         }
 448         off = rules->buf_cur;
 449         memcpy(&rules->buf[rules->buf_cur], str, bytes);
 450         rules->buf_cur += bytes;
 451         rules->buf_count++;
 452         return off;
 453 }
 454
 455 static int add_string(struct udev_rules *rules, const char *str)
 456 {
 457         unsigned int node_idx;
 458         struct trie_node *new_node;
 459         unsigned int new_node_idx;
 460         unsigned char key;
 461         unsigned short len;
 462         unsigned int depth;
 463         unsigned int off;
 464         struct trie_node *parent;
 465
 466         /* walk trie, start from last character of str to find matching tails */
 467         len = strlen(str);
 468         key = str[len-1];
 469         node_idx = 0;
 470         for (depth = 0; depth <= len; depth++) {
 471                 struct trie_node *node;
 472                 unsigned int child_idx;
 473
 474                 node = &rules->trie_nodes[node_idx];
 475                 off = node->value_off + node->value_len - len;
 476
 477                 /* match against current node */
 478                 if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))
 479                         return off;
 480
 481                 /* lookup child node */
 482                 key = str[len - 1 - depth];
 483                 child_idx = node->child_idx;
 484                 while (child_idx > 0) {
 485                         struct trie_node *child;
 486
 487                         child = &rules->trie_nodes[child_idx];
 488                         if (child->key == key)
 489                                 break;
 490                         child_idx = child->next_child_idx;
 491                 }
 492                 if (child_idx == 0)
 493                         break;
 494                 node_idx = child_idx;
 495         }
 496
 497         /* string not found, add it */
 498         off = add_new_string(rules, str, len + 1);
 499
 500         /* grow trie nodes if needed */
 501         if (rules->trie_nodes_cur >= rules->trie_nodes_max) {
 502                 struct trie_node *nodes;
 503                 unsigned int add;
 504
 505                 /* double the buffer size */
 506                 add = rules->trie_nodes_max;
 507                 if (add < 8)
 508                         add = 8;
 509
 510                 nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));
 511                 if (nodes == NULL)
 512                         return -1;
 513                 dbg(rules->udev, "extend trie nodes from %u to %u\n",
 514                     rules->trie_nodes_max, rules->trie_nodes_max + add);
 515                 rules->trie_nodes = nodes;
 516                 rules->trie_nodes_max += add;
 517         }
 518
 519         /* get a new node */
 520         new_node_idx = rules->trie_nodes_cur;
 521         rules->trie_nodes_cur++;
 522         new_node = &rules->trie_nodes[new_node_idx];
 523         memset(new_node, 0x00, sizeof(struct trie_node));
 524         new_node->value_off = off;
 525         new_node->value_len = len;
 526         new_node->key = key;
 527
 528         /* join the parent's child list */
 529         parent = &rules->trie_nodes[node_idx];
 530         if (parent->child_idx == 0) {
 531                 parent->child_idx = new_node_idx;
 532         } else {
 533                 struct trie_node *last_child;
 534
 535                 last_child = &rules->trie_nodes[parent->last_child_idx];
 536                 last_child->next_child_idx = new_node_idx;
 537         }
 538         parent->last_child_idx = new_node_idx;
 539         return off;
 540 }
 541
 542 static int add_token(struct udev_rules *rules, struct token *token)
 543 {
 544         /* grow buffer if needed */
 545         if (rules->token_cur+1 >= rules->token_max) {
 546                 struct token *tokens;
 547                 unsigned int add;
 548
 549                 /* double the buffer size */
 550                 add = rules->token_max;
 551                 if (add < 8)
 552                         add = 8;
 553
 554                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 555                 if (tokens == NULL)
 556                         return -1;
 557                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 558                 rules->tokens = tokens;
 559                 rules->token_max += add;
 560         }
 561         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 562         rules->token_cur++;
 563         return 0;
 564 }
 565
 566 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 567 {
 568         unsigned int i;
 569         uid_t uid;
 570         unsigned int off;
 571
 572         /* lookup, if we know it already */
 573         for (i = 0; i < rules->uids_cur; i++) {
 574                 off = rules->uids[i].name_off;
 575                 if (strcmp(&rules->buf[off], owner) == 0) {
 576                         uid = rules->uids[i].uid;
 577                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 578                         return uid;
 579                 }
 580         }
 581         uid = util_lookup_user(rules->udev, owner);
 582
 583         /* grow buffer if needed */
 584         if (rules->uids_cur+1 >= rules->uids_max) {
 585                 struct uid_gid *uids;
 586                 unsigned int add;
 587
 588                 /* double the buffer size */
 589                 add = rules->uids_max;
 590                 if (add < 1)
 591                         add = 8;
 592
 593                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 594                 if (uids == NULL)
 595                         return uid;
 596                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 597                 rules->uids = uids;
 598                 rules->uids_max += add;
 599         }
 600         rules->uids[rules->uids_cur].uid = uid;
 601         off = add_string(rules, owner);
 602         if (off <= 0)
 603                 return uid;
 604         rules->uids[rules->uids_cur].name_off = off;
 605         rules->uids_cur++;
 606         return uid;
 607 }
 608
 609 static gid_t add_gid(struct udev_rules *rules, const char *group)
 610 {
 611         unsigned int i;
 612         gid_t gid;
 613         unsigned int off;
 614
 615         /* lookup, if we know it already */
 616         for (i = 0; i < rules->gids_cur; i++) {
 617                 off = rules->gids[i].name_off;
 618                 if (strcmp(&rules->buf[off], group) == 0) {
 619                         gid = rules->gids[i].gid;
 620                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 621                         return gid;
 622                 }
 623         }
 624         gid = util_lookup_group(rules->udev, group);
 625
 626         /* grow buffer if needed */
 627         if (rules->gids_cur+1 >= rules->gids_max) {
 628                 struct uid_gid *gids;
 629                 unsigned int add;
 630
 631                 /* double the buffer size */
 632                 add = rules->gids_max;
 633                 if (add < 1)
 634                         add = 8;
 635
 636                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 637                 if (gids == NULL)
 638                         return gid;
 639                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 640                 rules->gids = gids;
 641                 rules->gids_max += add;
 642         }
 643         rules->gids[rules->gids_cur].gid = gid;
 644         off = add_string(rules, group);
 645         if (off <= 0)
 646                 return gid;
 647         rules->gids[rules->gids_cur].name_off = off;
 648         rules->gids_cur++;
 649         return gid;
 650 }
 651
 652 static int import_property_from_string(struct udev_device *dev, char *line)
 653 {
 654         struct udev *udev = udev_device_get_udev(dev);
 655         char *key;
 656         char *val;
 657         size_t len;
 658
 659         /* find key */
 660         key = line;
 661         while (isspace(key[0]))
 662                 key++;
 663
 664         /* comment or empty line */
 665         if (key[0] == '#' || key[0] == '\0')
 666                 return -1;
 667
 668         /* split key/value */
 669         val = strchr(key, '=');
 670         if (val == NULL)
 671                 return -1;
 672         val[0] = '\0';
 673         val++;
 674
 675         /* find value */
 676         while (isspace(val[0]))
 677                 val++;
 678
 679         /* terminate key */
 680         len = strlen(key);
 681         if (len == 0)
 682                 return -1;
 683         while (isspace(key[len-1]))
 684                 len--;
 685         key[len] = '\0';
 686
 687         /* terminate value */
 688         len = strlen(val);
 689         if (len == 0)
 690                 return -1;
 691         while (isspace(val[len-1]))
 692                 len--;
 693         val[len] = '\0';
 694
 695         if (len == 0)
 696                 return -1;
 697
 698         /* unquote */
 699         if (val[0] == '"' || val[0] == '\'') {
 700                 if (val[len-1] != val[0]) {
 701                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 702                         return -1;
 703                 }
 704                 val[len-1] = '\0';
 705                 val++;
 706         }
 707
 708         dbg(udev, "adding '%s'='%s'\n", key, val);
 709
 710         /* handle device, renamed by external tool, returning new path */
 711         if (strcmp(key, "DEVPATH") == 0) {
 712                 char syspath[UTIL_PATH_SIZE];
 713
 714                 info(udev, "updating devpath from '%s' to '%s'\n",
 715                      udev_device_get_devpath(dev), val);
 716                 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);
 717                 udev_device_set_syspath(dev, syspath);
 718         } else {
 719                 struct udev_list_entry *entry;
 720
 721                 entry = udev_device_add_property(dev, key, val);
 722                 /* store in db, skip private keys */
 723                 if (key[0] != '.')
 724                         udev_list_entry_set_flag(entry, 1);
 725         }
 726         return 0;
 727 }
 728
 729 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 730 {
 731         FILE *f;
 732         char line[UTIL_LINE_SIZE];
 733
 734         f = fopen(filename, "r");
 735         if (f == NULL)
 736                 return -1;
 737         while (fgets(line, sizeof(line), f) != NULL)
 738                 import_property_from_string(dev, line);
 739         fclose(f);
 740         return 0;
 741 }
 742
 743 static int import_program_into_properties(struct udev_device *dev, const char *program)
 744 {
 745         struct udev *udev = udev_device_get_udev(dev);
 746         char **envp;
 747         char result[4096];
 748         size_t reslen;
 749         char *line;
 750
 751         envp = udev_device_get_properties_envp(dev);
 752         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen) != 0)
 753                 return -1;
 754
 755         line = result;
 756         while (line != NULL) {
 757                 char *pos;
 758
 759                 pos = strchr(line, '\n');
 760                 if (pos != NULL) {
 761                         pos[0] = '\0';
 762                         pos = &pos[1];
 763                 }
 764                 import_property_from_string(dev, line);
 765                 line = pos;
 766         }
 767         return 0;
 768 }
 769
 770 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 771 {
 772         struct udev *udev = udev_device_get_udev(dev);
 773         struct udev_device *dev_parent;
 774         struct udev_list_entry *list_entry;
 775
 776         dev_parent = udev_device_get_parent(dev);
 777         if (dev_parent == NULL)
 778                 return -1;
 779
 780         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 781         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 782                 const char *key = udev_list_entry_get_name(list_entry);
 783                 const char *val = udev_list_entry_get_value(list_entry);
 784
 785                 if (fnmatch(filter, key, 0) == 0) {
 786                         struct udev_list_entry *entry;
 787
 788                         dbg(udev, "import key '%s=%s'\n", key, val);
 789                         entry = udev_device_add_property(dev, key, val);
 790                         /* store in db, skip private keys */
 791                         if (key[0] != '.')
 792                                 udev_list_entry_set_flag(entry, 1);
 793                 }
 794         }
 795         return 0;
 796 }
 797
 798 #define WAIT_LOOP_PER_SECOND            50
 799 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 800 {
 801         struct udev *udev = udev_device_get_udev(dev);
 802         char filepath[UTIL_PATH_SIZE];
 803         char devicepath[UTIL_PATH_SIZE];
 804         struct stat stats;
 805         int loop = timeout * WAIT_LOOP_PER_SECOND;
 806
 807         /* a relative path is a device attribute */
 808         devicepath[0] = '\0';
 809         if (file[0] != '/') {
 810                 util_strscpyl(devicepath, sizeof(devicepath),
 811                               udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);
 812                 util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 813                 file = filepath;
 814         }
 815
 816         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 817         while (--loop) {
 818                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 819
 820                 /* lookup file */
 821                 if (stat(file, &stats) == 0) {
 822                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 823                         return 0;
 824                 }
 825                 /* make sure, the device did not disappear in the meantime */
 826                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 827                         info(udev, "device disappeared while waiting for '%s'\n", file);
 828                         return -2;
 829                 }
 830                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 831                 nanosleep(&duration, NULL);
 832         }
 833         info(udev, "waiting for '%s' failed\n", file);
 834         return -1;
 835 }
 836
 837 static int attr_subst_subdir(char *attr, size_t len)
 838 {
 839         int found = 0;
 840
 841         if (strstr(attr, "/*/")) {
 842                 char *pos;
 843                 char dirname[UTIL_PATH_SIZE];
 844                 const char *tail;
 845                 DIR *dir;
 846
 847                 util_strscpy(dirname, sizeof(dirname), attr);
 848                 pos = strstr(dirname, "/*/");
 849                 if (pos == NULL)
 850                         return -1;
 851                 pos[0] = '\0';
 852                 tail = &pos[2];
 853                 dir = opendir(dirname);
 854                 if (dir != NULL) {
 855                         struct dirent *dent;
 856
 857                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 858                                 struct stat stats;
 859
 860                                 if (dent->d_name[0] == '.')
 861                                         continue;
 862                                 util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 863                                 if (stat(attr, &stats) == 0) {
 864                                         found = 1;
 865                                         break;
 866                                 }
 867                         }
 868                         closedir(dir);
 869                 }
 870         }
 871
 872         return found;
 873 }
 874
 875 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 876 {
 877         char *linepos;
 878         char *temp;
 879
 880         linepos = *line;
 881         if (linepos == NULL || linepos[0] == '\0')
 882                 return -1;
 883
 884         /* skip whitespace */
 885         while (isspace(linepos[0]) || linepos[0] == ',')
 886                 linepos++;
 887
 888         /* get the key */
 889         if (linepos[0] == '\0')
 890                 return -1;
 891         *key = linepos;
 892
 893         while (1) {
 894                 linepos++;
 895                 if (linepos[0] == '\0')
 896                         return -1;
 897                 if (isspace(linepos[0]))
 898                         break;
 899                 if (linepos[0] == '=')
 900                         break;
 901                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 902                         if (linepos[1] == '=')
 903                                 break;
 904         }
 905
 906         /* remember end of key */
 907         temp = linepos;
 908
 909         /* skip whitespace after key */
 910         while (isspace(linepos[0]))
 911                 linepos++;
 912         if (linepos[0] == '\0')
 913                 return -1;
 914
 915         /* get operation type */
 916         if (linepos[0] == '=' && linepos[1] == '=') {
 917                 *op = OP_MATCH;
 918                 linepos += 2;
 919         } else if (linepos[0] == '!' && linepos[1] == '=') {
 920                 *op = OP_NOMATCH;
 921                 linepos += 2;
 922         } else if (linepos[0] == '+' && linepos[1] == '=') {
 923                 *op = OP_ADD;
 924                 linepos += 2;
 925         } else if (linepos[0] == '=') {
 926                 *op = OP_ASSIGN;
 927                 linepos++;
 928         } else if (linepos[0] == ':' && linepos[1] == '=') {
 929                 *op = OP_ASSIGN_FINAL;
 930                 linepos += 2;
 931         } else
 932                 return -1;
 933
 934         /* terminate key */
 935         temp[0] = '\0';
 936
 937         /* skip whitespace after operator */
 938         while (isspace(linepos[0]))
 939                 linepos++;
 940         if (linepos[0] == '\0')
 941                 return -1;
 942
 943         /* get the value */
 944         if (linepos[0] == '"')
 945                 linepos++;
 946         else
 947                 return -1;
 948         *value = linepos;
 949
 950         /* terminate */
 951         temp = strchr(linepos, '"');
 952         if (!temp)
 953                 return -1;
 954         temp[0] = '\0';
 955         temp++;
 956         dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);
 957
 958         /* move line to next key */
 959         *line = temp;
 960         return 0;
 961 }
 962
 963 /* extract possible KEY{attr} */
 964 static char *get_key_attribute(struct udev *udev, char *str)
 965 {
 966         char *pos;
 967         char *attr;
 968
 969         attr = strchr(str, '{');
 970         if (attr != NULL) {
 971                 attr++;
 972                 pos = strchr(attr, '}');
 973                 if (pos == NULL) {
 974                         err(udev, "missing closing brace for format\n");
 975                         return NULL;
 976                 }
 977                 pos[0] = '\0';
 978                 dbg(udev, "attribute='%s'\n", attr);
 979                 return attr;
 980         }
 981         return NULL;
 982 }
 983
 984 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 985                         enum operation_type op,
 986                         const char *value, const void *data)
 987 {
 988         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 989         const char *attr = NULL;
 990
 991         memset(token, 0x00, sizeof(struct token));
 992
 993         switch (type) {
 994         case TK_M_ACTION:
 995         case TK_M_DEVPATH:
 996         case TK_M_KERNEL:
 997         case TK_M_SUBSYSTEM:
 998         case TK_M_DRIVER:
 999         case TK_M_WAITFOR:
1000         case TK_M_DEVLINK:
1001         case TK_M_NAME:
1002         case TK_M_KERNELS:
1003         case TK_M_SUBSYSTEMS:
1004         case TK_M_DRIVERS:
1005         case TK_M_PROGRAM:
1006         case TK_M_IMPORT_FILE:
1007         case TK_M_IMPORT_PROG:
1008         case TK_M_IMPORT_PARENT:
1009         case TK_M_RESULT:
1010         case TK_A_OWNER:
1011         case TK_A_GROUP:
1012         case TK_A_MODE:
1013         case TK_A_NAME:
1014         case TK_A_DEVLINK:
1015         case TK_A_GOTO:
1016                 token->key.value_off = add_string(rule_tmp->rules, value);
1017                 break;
1018         case TK_M_ENV:
1019         case TK_M_ATTR:
1020         case TK_M_ATTRS:
1021         case TK_A_ATTR:
1022         case TK_A_ENV:
1023                 attr = data;
1024                 token->key.value_off = add_string(rule_tmp->rules, value);
1025                 token->key.attr_off = add_string(rule_tmp->rules, attr);
1026                 break;
1027         case TK_M_TEST:
1028                 token->key.value_off = add_string(rule_tmp->rules, value);
1029                 if (data != NULL)
1030                         token->key.mode = *(mode_t *)data;
1031                 break;
1032         case TK_A_IGNORE_DEVICE:
1033         case TK_A_STRING_ESCAPE_NONE:
1034         case TK_A_STRING_ESCAPE_REPLACE:
1035         case TK_A_IGNORE_REMOVE:
1036         case TK_A_LAST_RULE:
1037                 break;
1038         case TK_A_RUN:
1039                 token->key.value_off = add_string(rule_tmp->rules, value);
1040                 token->key.ignore_error = *(int *)data;
1041                 break;
1042         case TK_A_INOTIFY_WATCH:
1043         case TK_A_NUM_FAKE_PART:
1044         case TK_A_DEVLINK_PRIO:
1045                 token->key.devlink_prio = *(int *)data;
1046                 break;
1047         case TK_A_OWNER_ID:
1048                 token->key.uid = *(uid_t *)data;
1049                 break;
1050         case TK_A_GROUP_ID:
1051                 token->key.gid = *(gid_t *)data;
1052                 break;
1053         case TK_A_MODE_ID:
1054                 token->key.mode = *(mode_t *)data;
1055                 break;
1056         case TK_A_EVENT_TIMEOUT:
1057                 token->key.event_timeout = *(int *)data;
1058                 break;
1059         case TK_RULE:
1060         case TK_M_PARENTS_MIN:
1061         case TK_M_PARENTS_MAX:
1062         case TK_M_MAX:
1063         case TK_END:
1064         case TK_UNSET:
1065                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
1066                 return -1;
1067         }
1068
1069         if (value != NULL && type < TK_M_MAX) {
1070                 /* check if we need to split or call fnmatch() while matching rules */
1071                 enum string_glob_type glob;
1072                 int has_split;
1073                 int has_glob;
1074
1075                 has_split = (strchr(value, '|') != NULL);
1076                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
1077                 if (has_split && has_glob) {
1078                         glob = GL_SPLIT_GLOB;
1079                 } else if (has_split) {
1080                         glob = GL_SPLIT;
1081                 } else if (has_glob) {
1082                         if (strcmp(value, "?*") == 0)
1083                                 glob = GL_SOMETHING;
1084                         else
1085                                 glob = GL_GLOB;
1086                 } else {
1087                         glob = GL_PLAIN;
1088                 }
1089                 token->key.glob = glob;
1090         }
1091
1092         if (value != NULL && type > TK_M_MAX) {
1093                 /* check if assigned value has substitution chars */
1094                 if (value[0] == '[')
1095                         token->key.subst = SB_SUBSYS;
1096                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
1097                         token->key.subst = SB_FORMAT;
1098                 else
1099                         token->key.subst = SB_NONE;
1100         }
1101
1102         if (attr != NULL) {
1103                 /* check if property/attribut name has substitution chars */
1104                 if (attr[0] == '[')
1105                         token->key.attrsubst = SB_SUBSYS;
1106                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
1107                         token->key.attrsubst = SB_FORMAT;
1108                 else
1109                         token->key.attrsubst = SB_NONE;
1110         }
1111
1112         token->key.type = type;
1113         token->key.op = op;
1114         rule_tmp->token_cur++;
1115         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
1116                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
1117                 return -1;
1118         }
1119         return 0;
1120 }
1121
1122 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1123 {
1124         unsigned int i;
1125         unsigned int start = 0;
1126         unsigned int end = rule_tmp->token_cur;
1127
1128         for (i = 0; i < rule_tmp->token_cur; i++) {
1129                 enum token_type next_val = TK_UNSET;
1130                 unsigned int next_idx;
1131                 unsigned int j;
1132
1133                 /* find smallest value */
1134                 for (j = start; j < end; j++) {
1135                         if (rule_tmp->token[j].type == TK_UNSET)
1136                                 continue;
1137                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1138                                 next_val = rule_tmp->token[j].type;
1139                                 next_idx = j;
1140                         }
1141                 }
1142
1143                 /* add token and mark done */
1144                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1145                         return -1;
1146                 rule_tmp->token[next_idx].type = TK_UNSET;
1147
1148                 /* shrink range */
1149                 if (next_idx == start)
1150                         start++;
1151                 if (next_idx+1 == end)
1152                         end--;
1153         }
1154         return 0;
1155 }
1156
1157 static int add_rule(struct udev_rules *rules, char *line,
1158                     const char *filename, unsigned int filename_off, unsigned int lineno)
1159 {
1160         char *linepos;
1161         char *attr;
1162         struct rule_tmp rule_tmp;
1163
1164         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1165         rule_tmp.rules = rules;
1166         rule_tmp.rule.type = TK_RULE;
1167         rule_tmp.rule.rule.filename_off = filename_off;
1168         rule_tmp.rule.rule.filename_line = lineno;
1169
1170         linepos = line;
1171         while (1) {
1172                 char *key;
1173                 char *value;
1174                 enum operation_type op;
1175
1176                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1177                         break;
1178
1179                 if (strcmp(key, "ACTION") == 0) {
1180                         if (op > OP_MATCH_MAX) {
1181                                 err(rules->udev, "invalid ACTION operation\n");
1182                                 goto invalid;
1183                         }
1184                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1185                         continue;
1186                 }
1187
1188                 if (strcmp(key, "DEVPATH") == 0) {
1189                         if (op > OP_MATCH_MAX) {
1190                                 err(rules->udev, "invalid DEVPATH operation\n");
1191                                 goto invalid;
1192                         }
1193                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1194                         continue;
1195                 }
1196
1197                 if (strcmp(key, "KERNEL") == 0) {
1198                         if (op > OP_MATCH_MAX) {
1199                                 err(rules->udev, "invalid KERNEL operation\n");
1200                                 goto invalid;
1201                         }
1202                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1203                         continue;
1204                 }
1205
1206                 if (strcmp(key, "SUBSYSTEM") == 0) {
1207                         if (op > OP_MATCH_MAX) {
1208                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1209                                 goto invalid;
1210                         }
1211                         /* bus, class, subsystem events should all be the same */
1212                         if (strcmp(value, "subsystem") == 0 ||
1213                             strcmp(value, "bus") == 0 ||
1214                             strcmp(value, "class") == 0) {
1215                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1216                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1217                                             "please fix it in %s:%u", value, filename, lineno);
1218                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1219                         } else
1220                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1221                         continue;
1222                 }
1223
1224                 if (strcmp(key, "DRIVER") == 0) {
1225                         if (op > OP_MATCH_MAX) {
1226                                 err(rules->udev, "invalid DRIVER operation\n");
1227                                 goto invalid;
1228                         }
1229                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1230                         continue;
1231                 }
1232
1233                 if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1234                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1235                         if (attr == NULL) {
1236                                 err(rules->udev, "error parsing ATTR attribute\n");
1237                                 goto invalid;
1238                         }
1239                         if (op < OP_MATCH_MAX) {
1240                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1241                         } else {
1242                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1243                         }
1244                         continue;
1245                 }
1246
1247                 if (strcmp(key, "KERNELS") == 0 ||
1248                     strcmp(key, "ID") == 0) {
1249                         if (op > OP_MATCH_MAX) {
1250                                 err(rules->udev, "invalid KERNELS operation\n");
1251                                 goto invalid;
1252                         }
1253                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1254                         continue;
1255                 }
1256
1257                 if (strcmp(key, "SUBSYSTEMS") == 0 ||
1258                     strcmp(key, "BUS") == 0) {
1259                         if (op > OP_MATCH_MAX) {
1260                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1261                                 goto invalid;
1262                         }
1263                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1264                         continue;
1265                 }
1266
1267                 if (strcmp(key, "DRIVERS") == 0) {
1268                         if (op > OP_MATCH_MAX) {
1269                                 err(rules->udev, "invalid DRIVERS operation\n");
1270                                 goto invalid;
1271                         }
1272                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1273                         continue;
1274                 }
1275
1276                 if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
1277                     strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1278                         if (op > OP_MATCH_MAX) {
1279                                 err(rules->udev, "invalid ATTRS operation\n");
1280                                 goto invalid;
1281                         }
1282                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1283                         if (attr == NULL) {
1284                                 err(rules->udev, "error parsing ATTRS attribute\n");
1285                                 goto invalid;
1286                         }
1287                         if (strncmp(attr, "device/", 7) == 0)
1288                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1289                                     "please fix it in %s:%u", filename, lineno);
1290                         else if (strstr(attr, "../") != NULL)
1291                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1292                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1293                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1294                         continue;
1295                 }
1296
1297                 if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1298                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1299                         if (attr == NULL) {
1300                                 err(rules->udev, "error parsing ENV attribute\n");
1301                                 goto invalid;
1302                         }
1303                         if (op < OP_MATCH_MAX) {
1304                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1305                                         goto invalid;
1306                         } else {
1307                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1308                                         goto invalid;
1309                         }
1310                         continue;
1311                 }
1312
1313                 if (strcmp(key, "PROGRAM") == 0) {
1314                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1315                         continue;
1316                 }
1317
1318                 if (strcmp(key, "RESULT") == 0) {
1319                         if (op > OP_MATCH_MAX) {
1320                                 err(rules->udev, "invalid RESULT operation\n");
1321                                 goto invalid;
1322                         }
1323                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1324                         continue;
1325                 }
1326
1327                 if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1328                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1329                         if (attr != NULL && strstr(attr, "program")) {
1330                                 dbg(rules->udev, "IMPORT will be executed\n");
1331                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1332                         } else if (attr != NULL && strstr(attr, "file")) {
1333                                 dbg(rules->udev, "IMPORT will be included as file\n");
1334                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1335                         } else if (attr != NULL && strstr(attr, "parent")) {
1336                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1337                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1338                         } else {
1339                                 /* figure it out if it is executable */
1340                                 char file[UTIL_PATH_SIZE];
1341                                 char *pos;
1342                                 struct stat statbuf;
1343
1344                                 /* allow programs in /lib/udev called without the path */
1345                                 if (value[0] != '/')
1346                                         util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);
1347                                 else
1348                                         util_strscpy(file, sizeof(file), value);
1349                                 pos = strchr(file, ' ');
1350                                 if (pos)
1351                                         pos[0] = '\0';
1352                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1353                                 if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {
1354                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1355                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1356                                 } else {
1357                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1358                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1359                                 }
1360                         }
1361                         continue;
1362                 }
1363
1364                 if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {
1365                         mode_t mode = 0;
1366
1367                         if (op > OP_MATCH_MAX) {
1368                                 err(rules->udev, "invalid TEST operation\n");
1369                                 goto invalid;
1370                         }
1371                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1372                         if (attr != NULL) {
1373                                 mode = strtol(attr, NULL, 8);
1374                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1375                         } else {
1376                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1377                         }
1378                         continue;
1379                 }
1380
1381                 if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {
1382                         int flag = 0;
1383
1384                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1385                         if (attr != NULL && strstr(attr, "fail_event_on_error"))
1386                                 flag = 1;
1387                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1388                         continue;
1389                 }
1390
1391                 if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {
1392                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1393                         continue;
1394                 }
1395
1396                 if (strcmp(key, "LABEL") == 0) {
1397                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1398                         continue;
1399                 }
1400
1401                 if (strcmp(key, "GOTO") == 0) {
1402                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1403                         continue;
1404                 }
1405
1406                 if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {
1407                         if (op < OP_MATCH_MAX) {
1408                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1409                         } else {
1410                                 if (value[0] == '\0')
1411                                         info(rules->udev, "name empty, node creation suppressed\n");
1412                                 else if (strcmp(value, "%k") == 0)
1413                                         err(rules->udev, "NAME=\"%%k\" is superfluous and breaks "
1414                                             "kernel supplied names, please remove it from %s:%u\n", filename, lineno);
1415                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1416                                 attr = get_key_attribute(rules->udev, key + sizeof("NAME")-1);
1417                                 if (attr != NULL) {
1418                                         if (strstr(attr, "all_partitions") != NULL) {
1419                                                 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1420
1421                                                 dbg(rules->udev, "creation of partition nodes requested\n");
1422                                                 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1423                                         }
1424                                         if (strstr(attr, "ignore_remove") != NULL) {
1425                                                 dbg(rules->udev, "remove event should be ignored\n");
1426                                                 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1427                                         }
1428                                 }
1429                         }
1430                         rule_tmp.rule.rule.flags = 1;
1431                         continue;
1432                 }
1433
1434                 if (strcmp(key, "SYMLINK") == 0) {
1435                         if (op < OP_MATCH_MAX)
1436                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1437                         else
1438                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1439                         rule_tmp.rule.rule.flags = 1;
1440                         continue;
1441                 }
1442
1443                 if (strcmp(key, "OWNER") == 0) {
1444                         uid_t uid;
1445                         char *endptr;
1446
1447                         uid = strtoul(value, &endptr, 10);
1448                         if (endptr[0] == '\0') {
1449                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1450                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1451                                 uid = add_uid(rules, value);
1452                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1453                         } else if (rules->resolve_names >= 0) {
1454                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1455                         }
1456                         rule_tmp.rule.rule.flags = 1;
1457                         continue;
1458                 }
1459
1460                 if (strcmp(key, "GROUP") == 0) {
1461                         gid_t gid;
1462                         char *endptr;
1463
1464                         gid = strtoul(value, &endptr, 10);
1465                         if (endptr[0] == '\0') {
1466                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1467                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1468                                 gid = add_gid(rules, value);
1469                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1470                         } else if (rules->resolve_names >= 0) {
1471                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1472                         }
1473                         rule_tmp.rule.rule.flags = 1;
1474                         continue;
1475                 }
1476
1477                 if (strcmp(key, "MODE") == 0) {
1478                         mode_t mode;
1479                         char *endptr;
1480
1481                         mode = strtol(value, &endptr, 8);
1482                         if (endptr[0] == '\0')
1483                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1484                         else
1485                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1486                         rule_tmp.rule.rule.flags = 1;
1487                         continue;
1488                 }
1489
1490                 if (strcmp(key, "OPTIONS") == 0) {
1491                         const char *pos;
1492
1493                         if (strstr(value, "last_rule") != NULL) {
1494                                 dbg(rules->udev, "last rule to be applied\n");
1495                                 rule_add_key(&rule_tmp, TK_A_LAST_RULE, 0, NULL, NULL);
1496                         }
1497                         if (strstr(value, "ignore_device") != NULL) {
1498                                 dbg(rules->udev, "device should be ignored\n");
1499                                 rule_add_key(&rule_tmp, TK_A_IGNORE_DEVICE, 0, NULL, NULL);
1500                         }
1501                         if (strstr(value, "ignore_remove") != NULL) {
1502                                 dbg(rules->udev, "remove event should be ignored\n");
1503                                 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1504                         }
1505                         pos = strstr(value, "link_priority=");
1506                         if (pos != NULL) {
1507                                 int prio = atoi(&pos[strlen("link_priority=")]);
1508
1509                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1510                                 dbg(rules->udev, "link priority=%i\n", prio);
1511                         }
1512                         pos = strstr(value, "event_timeout=");
1513                         if (pos != NULL) {
1514                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1515
1516                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1517                                 dbg(rules->udev, "event timeout=%i\n", tout);
1518                         }
1519                         pos = strstr(value, "string_escape=");
1520                         if (pos != NULL) {
1521                                 pos = &pos[strlen("string_escape=")];
1522                                 if (strncmp(pos, "none", strlen("none")) == 0)
1523                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1524                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1525                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1526                         }
1527                         if (strstr(value, "all_partitions") != NULL) {
1528                                 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1529
1530                                 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1531                                 dbg(rules->udev, "creation of partition nodes requested\n");
1532                         }
1533                         pos = strstr(value, "nowatch");
1534                         if (pos != NULL) {
1535                                 const int off = 0;
1536
1537                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &off);
1538                                 dbg(rules->udev, "inotify watch of device disabled\n");
1539                         } else {
1540                                 pos = strstr(value, "watch");
1541                                 if (pos != NULL) {
1542                                         const int on = 1;
1543
1544                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &on);
1545                                         dbg(rules->udev, "inotify watch of device requested\n");
1546                                 }
1547                         }
1548                         continue;
1549                 }
1550                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1551         }
1552
1553         /* add rule token */
1554         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1555         if (add_token(rules, &rule_tmp.rule) != 0)
1556                 goto invalid;
1557
1558         /* add tokens to list, sorted by type */
1559         if (sort_token(rules, &rule_tmp) != 0)
1560                 goto invalid;
1561
1562         return 0;
1563 invalid:
1564         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1565         return -1;
1566 }
1567
1568 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1569 {
1570         FILE *f;
1571         char line[UTIL_LINE_SIZE];
1572         int line_nr = 0;
1573         unsigned int i;
1574
1575         info(rules->udev, "reading '%s' as rules file\n", filename);
1576
1577         f = fopen(filename, "r");
1578         if (f == NULL)
1579                 return -1;
1580         while (fgets(line, sizeof(line), f) != NULL) {
1581                 char *key;
1582                 size_t len;
1583
1584                 /* skip whitespace */
1585                 line_nr++;
1586                 key = line;
1587                 while (isspace(key[0]))
1588                         key++;
1589
1590                 /* comment */
1591                 if (key[0] == '#')
1592                         continue;
1593
1594                 len = strlen(line);
1595                 if (len < 3)
1596                         continue;
1597
1598                 /* continue reading if backslash+newline is found */
1599                 while (line[len-2] == '\\') {
1600                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1601                                 break;
1602                         line_nr++;
1603                         len = strlen(line);
1604                 }
1605
1606                 if (len+1 >= sizeof(line)) {
1607                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1608                         continue;
1609                 }
1610                 add_rule(rules, key, filename, filename_off, line_nr);
1611         }
1612         fclose(f);
1613
1614         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1615         for (i = rules->token_cur+1; i < rules->token_cur; i++) {
1616                 if (rules->tokens[i].type == TK_A_GOTO) {
1617                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1618                         unsigned int j;
1619
1620                         for (j = i+1; j < rules->token_cur; j++) {
1621                                 if (rules->tokens[j].type != TK_RULE)
1622                                         continue;
1623                                 if (rules->tokens[j].rule.label_off == 0)
1624                                         continue;
1625                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1626                                         continue;
1627                                 rules->tokens[i].key.rule_goto = j;
1628                                 break;
1629                         }
1630                         if (rules->tokens[i].key.rule_goto == 0)
1631                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1632                 }
1633         }
1634         return 0;
1635 }
1636
1637 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1638 {
1639         DIR *dir;
1640         char filename[UTIL_PATH_SIZE];
1641
1642         dbg(udev, "open directory '%s'\n", dirname);
1643         dir = opendir(dirname);
1644         if (dir == NULL) {
1645                 info(udev, "unable to open '%s': %m\n", dirname);
1646                 return -1;
1647         }
1648
1649         while (1) {
1650                 struct dirent *dent;
1651
1652                 dent = readdir(dir);
1653                 if (dent == NULL || dent->d_name[0] == '\0')
1654                         break;
1655
1656                 if (dent->d_name[0] == '.')
1657                         continue;
1658
1659                 /* look for file matching with specified suffix */
1660                 if (suffix != NULL) {
1661                         const char *ext;
1662
1663                         ext = strrchr(dent->d_name, '.');
1664                         if (ext == NULL)
1665                                 continue;
1666                         if (strcmp(ext, suffix) != 0)
1667                                 continue;
1668                 }
1669                 util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
1670                 dbg(udev, "put file '%s' into list\n", filename);
1671                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1672         }
1673
1674         closedir(dir);
1675         return 0;
1676 }
1677
1678 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1679 {
1680         struct udev_rules *rules;
1681         struct stat statbuf;
1682         struct udev_list_node file_list;
1683         struct udev_list_entry *file_loop, *file_tmp;
1684         struct token end_token;
1685
1686         rules = malloc(sizeof(struct udev_rules));
1687         if (rules == NULL)
1688                 return NULL;
1689         memset(rules, 0x00, sizeof(struct udev_rules));
1690         rules->udev = udev;
1691         rules->resolve_names = resolve_names;
1692         udev_list_init(&file_list);
1693
1694         /* init token array and string buffer */
1695         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1696         if (rules->tokens == NULL)
1697                 return NULL;
1698         rules->token_max = PREALLOC_TOKEN;
1699
1700         rules->buf = malloc(PREALLOC_STRBUF);
1701         if (rules->buf == NULL)
1702                 return NULL;
1703         rules->buf_max = PREALLOC_STRBUF;
1704         /* offset 0 is always '\0' */
1705         rules->buf[0] = '\0';
1706         rules->buf_cur = 1;
1707         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1708             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1709
1710         rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));
1711         if (rules->trie_nodes == NULL)
1712                 return NULL;
1713         rules->trie_nodes_max = PREALLOC_TRIE;
1714         /* offset 0 is the trie root, with an empty string */
1715         memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
1716         rules->trie_nodes_cur = 1;
1717
1718         if (udev_get_rules_path(udev) != NULL) {
1719                 /* custom rules location for testing */
1720                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1721         } else {
1722                 char filename[PATH_MAX];
1723                 struct udev_list_node sort_list;
1724                 struct udev_list_entry *sort_loop, *sort_tmp;
1725
1726                 /* read user/custom rules */
1727                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1728
1729                 /* read dynamic/temporary rules */
1730                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1731                 if (stat(filename, &statbuf) != 0) {
1732                         util_create_path(udev, filename);
1733                         udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
1734                         mkdir(filename, 0755);
1735                         udev_selinux_resetfscreatecon(udev);
1736                 }
1737                 udev_list_init(&sort_list);
1738                 add_matching_files(udev, &sort_list, filename, ".rules");
1739
1740                 /* read default rules */
1741                 add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
1742
1743                 /* sort all rules files by basename into list of files */
1744                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1745                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1746                         const char *sort_base = strrchr(sort_name, '/');
1747
1748                         if (sort_base == NULL)
1749                                 continue;
1750                         /* sort entry into existing list */
1751                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1752                                 const char *file_name = udev_list_entry_get_name(file_loop);
1753                                 const char *file_base = strrchr(file_name, '/');
1754
1755                                 if (file_base == NULL)
1756                                         continue;
1757                                 if (strcmp(file_base, sort_base) == 0) {
1758                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1759                                              file_name, sort_name);
1760                                         udev_list_entry_delete(sort_loop);
1761                                         sort_loop = NULL;
1762                                         break;
1763                                 }
1764                                 if (strcmp(file_base, sort_base) > 0) {
1765                                         /* found later file, insert before */
1766                                         udev_list_entry_remove(sort_loop);
1767                                         udev_list_entry_insert_before(sort_loop, file_loop);
1768                                         sort_loop = NULL;
1769                                         break;
1770                                 }
1771                         }
1772                         /* current file already handled */
1773                         if (sort_loop == NULL)
1774                                 continue;
1775                         /* no later file, append to end of list */
1776                         udev_list_entry_remove(sort_loop);
1777                         udev_list_entry_append(sort_loop, &file_list);
1778                 }
1779         }
1780
1781         /* add all filenames to the string buffer */
1782         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1783                 const char *filename = udev_list_entry_get_name(file_loop);
1784                 unsigned int filename_off;
1785
1786                 filename_off = add_string(rules, filename);
1787                 /* the offset in the rule is limited to unsigned short */
1788                 if (filename_off < USHRT_MAX)
1789                         udev_list_entry_set_flag(file_loop, filename_off);
1790         }
1791
1792         /* parse list of files */
1793         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1794                 const char *filename = udev_list_entry_get_name(file_loop);
1795                 unsigned int filename_off = udev_list_entry_get_flag(file_loop);
1796
1797                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1798                         parse_file(rules, filename, filename_off);
1799                 else
1800                         err(udev, "can not read '%s'\n", filename);
1801                 udev_list_entry_delete(file_loop);
1802         }
1803
1804         memset(&end_token, 0x00, sizeof(struct token));
1805         end_token.type = TK_END;
1806         add_token(rules, &end_token);
1807
1808         /* shrink allocated token and string buffer */
1809         if (rules->token_cur < rules->token_max) {
1810                 struct token *tokens;
1811
1812                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1813                 if (tokens != NULL || rules->token_cur == 0) {
1814                         rules->tokens = tokens;
1815                         rules->token_max = rules->token_cur;
1816                 }
1817         }
1818         if (rules->buf_cur < rules->buf_max) {
1819                 char *buf;
1820
1821                 buf = realloc(rules->buf, rules->buf_cur);
1822                 if (buf != NULL || rules->buf_cur == 0) {
1823                         rules->buf = buf;
1824                         rules->buf_max = rules->buf_cur;
1825                 }
1826         }
1827         info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1828              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1829         info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",
1830              rules->trie_nodes_cur * sizeof(struct trie_node),
1831              rules->trie_nodes_cur, sizeof(struct trie_node));
1832
1833         /* cleanup trie */
1834         free(rules->trie_nodes);
1835         rules->trie_nodes = NULL;
1836         rules->trie_nodes_cur = 0;
1837         rules->trie_nodes_max = 0;
1838
1839         /* cleanup uid/gid cache */
1840         free(rules->uids);
1841         rules->uids = NULL;
1842         rules->uids_cur = 0;
1843         rules->uids_max = 0;
1844         free(rules->gids);
1845         rules->gids = NULL;
1846         rules->gids_cur = 0;
1847         rules->gids_max = 0;
1848
1849         dump_rules(rules);
1850         return rules;
1851 }
1852
1853 void udev_rules_unref(struct udev_rules *rules)
1854 {
1855         if (rules == NULL)
1856                 return;
1857         free(rules->tokens);
1858         free(rules->buf);
1859         free(rules->trie_nodes);
1860         free(rules->uids);
1861         free(rules->gids);
1862         free(rules);
1863 }
1864
1865 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1866 {
1867         char *key_value = &rules->buf[token->key.value_off];
1868         char *pos;
1869         int match = 0;
1870
1871         if (val == NULL)
1872                 val = "";
1873
1874         switch (token->key.glob) {
1875         case GL_PLAIN:
1876                 match = (strcmp(key_value, val) == 0);
1877                 break;
1878         case GL_GLOB:
1879                 match = (fnmatch(key_value, val, 0) == 0);
1880                 break;
1881         case GL_SPLIT:
1882                 {
1883                         const char *split;
1884                         size_t len;
1885
1886                         split = &rules->buf[token->key.value_off];
1887                         len = strlen(val);
1888                         while (1) {
1889                                 const char *next;
1890
1891                                 next = strchr(split, '|');
1892                                 if (next != NULL) {
1893                                         size_t matchlen = (size_t)(next - split);
1894
1895                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1896                                         if (match)
1897                                                 break;
1898                                 } else {
1899                                         match = (strcmp(split, val) == 0);
1900                                         break;
1901                                 }
1902                                 split = &next[1];
1903                         }
1904                         break;
1905                 }
1906         case GL_SPLIT_GLOB:
1907                 {
1908                         char value[UTIL_PATH_SIZE];
1909
1910                         util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);
1911                         key_value = value;
1912                         while (key_value != NULL) {
1913                                 pos = strchr(key_value, '|');
1914                                 if (pos != NULL) {
1915                                         pos[0] = '\0';
1916                                         pos = &pos[1];
1917                                 }
1918                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);
1919                                 match = (fnmatch(key_value, val, 0) == 0);
1920                                 if (match)
1921                                         break;
1922                                 key_value = pos;
1923                         }
1924                         break;
1925                 }
1926         case GL_SOMETHING:
1927                 match = (val[0] != '\0');
1928                 break;
1929         case GL_UNSET:
1930                 return -1;
1931         }
1932
1933         if (match && (token->key.op == OP_MATCH)) {
1934                 dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));
1935                 return 0;
1936         }
1937         if (!match && (token->key.op == OP_NOMATCH)) {
1938                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));
1939                 return 0;
1940         }
1941         dbg(rules->udev, "%s is not true\n", token_str(token->type));
1942         return -1;
1943 }
1944
1945 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1946 {
1947         const char *name;
1948         char nbuf[UTIL_NAME_SIZE];
1949         const char *value;
1950         char vbuf[UTIL_NAME_SIZE];
1951         size_t len;
1952
1953         name = &rules->buf[cur->key.attr_off];
1954         switch (cur->key.attrsubst) {
1955         case SB_FORMAT:
1956                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1957                 name = nbuf;
1958                 /* fall through */
1959         case SB_NONE:
1960                 value = udev_device_get_sysattr_value(dev, name);
1961                 if (value == NULL)
1962                         return -1;
1963                 break;
1964         case SB_SUBSYS:
1965                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1966                         return -1;
1967                 value = vbuf;
1968                 break;
1969         default:
1970                 return -1;
1971         }
1972
1973         /* remove trailing whitespace, if not asked to match for it */
1974         len = strlen(value);
1975         if (len > 0 && isspace(value[len-1])) {
1976                 const char *key_value;
1977                 size_t klen;
1978
1979                 key_value = &rules->buf[cur->key.value_off];
1980                 klen = strlen(key_value);
1981                 if (klen > 0 && !isspace(key_value[klen-1])) {
1982                         if (value != vbuf) {
1983                                 util_strscpy(vbuf, sizeof(vbuf), value);
1984                                 value = vbuf;
1985                         }
1986                         while (len > 0 && isspace(vbuf[--len]))
1987                                 vbuf[len] = '\0';
1988                         dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
1989                 }
1990         }
1991
1992         return match_key(rules, cur, value);
1993 }
1994
1995 enum escape_type {
1996         ESCAPE_UNSET,
1997         ESCAPE_NONE,
1998         ESCAPE_REPLACE,
1999 };
2000
2001 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
2002 {
2003         struct token *cur;
2004         struct token *rule;
2005         enum escape_type esc = ESCAPE_UNSET;
2006         int can_set_name;
2007
2008         if (rules->tokens == NULL)
2009                 return -1;
2010
2011         can_set_name = ((strcmp(udev_device_get_action(event->dev), "add") == 0 ||
2012                          strcmp(udev_device_get_action(event->dev), "change") == 0) &&
2013                         (major(udev_device_get_devnum(event->dev)) > 0 ||
2014                          strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
2015
2016         /* loop through token list, match, run actions or forward to next rule */
2017         cur = &rules->tokens[0];
2018         rule = cur;
2019         while (1) {
2020                 dump_token(rules, cur);
2021                 switch (cur->type) {
2022                 case TK_RULE:
2023                         /* current rule */
2024                         rule = cur;
2025                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
2026                         if (!can_set_name && rule->rule.flags)
2027                                 goto nomatch;
2028                         esc = ESCAPE_UNSET;
2029                         break;
2030                 case TK_M_ACTION:
2031                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
2032                                 goto nomatch;
2033                         break;
2034                 case TK_M_DEVPATH:
2035                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
2036                                 goto nomatch;
2037                         break;
2038                 case TK_M_KERNEL:
2039                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
2040                                 goto nomatch;
2041                         break;
2042                 case TK_M_DEVLINK:
2043                         {
2044                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
2045                                 struct udev_list_entry *list_entry;
2046                                 int match = 0;
2047
2048                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
2049                                         const char *devlink;
2050
2051                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
2052                                         if (match_key(rules, cur, devlink) == 0) {
2053                                                 match = 1;
2054                                                 break;
2055                                         }
2056                                 }
2057                                 if (!match)
2058                                         goto nomatch;
2059                                 break;
2060                         }
2061                 case TK_M_NAME:
2062                         if (match_key(rules, cur, event->name) != 0)
2063                                 goto nomatch;
2064                         break;
2065                 case TK_M_ENV:
2066                         {
2067                                 const char *key_name = &rules->buf[cur->key.attr_off];
2068                                 const char *value;
2069
2070                                 value = udev_device_get_property_value(event->dev, key_name);
2071                                 if (value == NULL) {
2072                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
2073                                         value = "";
2074                                 }
2075                                 if (match_key(rules, cur, value))
2076                                         goto nomatch;
2077                                 break;
2078                         }
2079                 case TK_M_SUBSYSTEM:
2080                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
2081                                 goto nomatch;
2082                         break;
2083                 case TK_M_DRIVER:
2084                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
2085                                 goto nomatch;
2086                         break;
2087                 case TK_M_WAITFOR:
2088                         {
2089                                 char filename[UTIL_PATH_SIZE];
2090                                 int found;
2091
2092                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2093                                 found = (wait_for_file(event->dev, filename, 10) == 0);
2094                                 if (!found && (cur->key.op != OP_NOMATCH))
2095                                         goto nomatch;
2096                                 break;
2097                         }
2098                 case TK_M_ATTR:
2099                         if (match_attr(rules, event->dev, event, cur) != 0)
2100                                 goto nomatch;
2101                         break;
2102                 case TK_M_KERNELS:
2103                 case TK_M_SUBSYSTEMS:
2104                 case TK_M_DRIVERS:
2105                 case TK_M_ATTRS:
2106                         {
2107                                 struct token *next;
2108
2109                                 /* get whole sequence of parent matches */
2110                                 next = cur;
2111                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
2112                                         next++;
2113
2114                                 /* loop over parents */
2115                                 event->dev_parent = event->dev;
2116                                 while (1) {
2117                                         struct token *key;
2118
2119                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
2120                                         /* loop over sequence of parent match keys */
2121                                         for (key = cur; key < next; key++ ) {
2122                                                 dump_token(rules, key);
2123                                                 switch(key->type) {
2124                                                 case TK_M_KERNELS:
2125                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
2126                                                                 goto try_parent;
2127                                                         break;
2128                                                 case TK_M_SUBSYSTEMS:
2129                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
2130                                                                 goto try_parent;
2131                                                         break;
2132                                                 case TK_M_DRIVERS:
2133                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2134                                                                 goto try_parent;
2135                                                         break;
2136                                                 case TK_M_ATTRS:
2137                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2138                                                                 goto try_parent;
2139                                                         break;
2140                                                 default:
2141                                                         goto nomatch;
2142                                                 }
2143                                                 dbg(event->udev, "parent key matched\n");
2144                                         }
2145                                         dbg(event->udev, "all parent keys matched\n");
2146                                         /* all keys matched */
2147                                         break;
2148
2149                                 try_parent:
2150                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2151                                         if (event->dev_parent == NULL)
2152                                                 goto nomatch;
2153                                 }
2154                                 /* move behind our sequence of parent match keys */
2155                                 cur = next;
2156                                 continue;
2157                         }
2158                 case TK_M_TEST:
2159                         {
2160                                 char filename[UTIL_PATH_SIZE];
2161                                 struct stat statbuf;
2162                                 int match;
2163
2164                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));
2165                                 if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2166                                         if (filename[0] != '/') {
2167                                                 char tmp[UTIL_PATH_SIZE];
2168
2169                                                 util_strscpy(tmp, sizeof(tmp), filename);
2170                                                 util_strscpyl(filename, sizeof(filename),
2171                                                               udev_device_get_syspath(event->dev), "/", tmp, NULL);
2172                                         }
2173                                 }
2174                                 attr_subst_subdir(filename, sizeof(filename));
2175
2176                                 match = (stat(filename, &statbuf) == 0);
2177                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2178                                 if (match && cur->key.mode > 0) {
2179                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2180                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2181                                             match ? "matches" : "does not match", cur->key.mode);
2182                                 }
2183                                 if (match && cur->key.op == OP_NOMATCH)
2184                                         goto nomatch;
2185                                 if (!match && cur->key.op == OP_MATCH)
2186                                         goto nomatch;
2187                                 break;
2188                         }
2189                 case TK_M_PROGRAM:
2190                         {
2191                                 char program[UTIL_PATH_SIZE];
2192                                 char **envp;
2193                                 char result[UTIL_PATH_SIZE];
2194
2195                                 free(event->program_result);
2196                                 event->program_result = NULL;
2197                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));
2198                                 envp = udev_device_get_properties_envp(event->dev);
2199                                 info(event->udev, "PROGRAM '%s' %s:%u\n",
2200                                      program,
2201                                      &rules->buf[rule->rule.filename_off],
2202                                      rule->rule.filename_line);
2203                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL) != 0) {
2204                                         if (cur->key.op != OP_NOMATCH)
2205                                                 goto nomatch;
2206                                 } else {
2207                                         int count;
2208
2209                                         util_remove_trailing_chars(result, '\n');
2210                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2211                                                 count = udev_util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2212                                                 if (count > 0)
2213                                                         info(event->udev, "%i character(s) replaced\n" , count);
2214                                         }
2215                                         event->program_result = strdup(result);
2216                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2217                                         if (cur->key.op == OP_NOMATCH)
2218                                                 goto nomatch;
2219                                 }
2220                                 break;
2221                         }
2222                 case TK_M_IMPORT_FILE:
2223                         {
2224                                 char import[UTIL_PATH_SIZE];
2225
2226                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2227                                 if (import_file_into_properties(event->dev, import) != 0)
2228                                         if (cur->key.op != OP_NOMATCH)
2229                                                 goto nomatch;
2230                                 break;
2231                         }
2232                 case TK_M_IMPORT_PROG:
2233                         {
2234                                 char import[UTIL_PATH_SIZE];
2235
2236                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2237                                 info(event->udev, "IMPORT '%s' %s:%u\n",
2238                                      import,
2239                                      &rules->buf[rule->rule.filename_off],
2240                                      rule->rule.filename_line);
2241                                 if (import_program_into_properties(event->dev, import) != 0)
2242                                         if (cur->key.op != OP_NOMATCH)
2243                                                 goto nomatch;
2244                                 break;
2245                         }
2246                 case TK_M_IMPORT_PARENT:
2247                         {
2248                                 char import[UTIL_PATH_SIZE];
2249
2250                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], import, sizeof(import));
2251                                 if (import_parent_into_properties(event->dev, import) != 0)
2252                                         if (cur->key.op != OP_NOMATCH)
2253                                                 goto nomatch;
2254                                 break;
2255                         }
2256                 case TK_M_RESULT:
2257                         if (match_key(rules, cur, event->program_result) != 0)
2258                                 goto nomatch;
2259                         break;
2260
2261                 case TK_A_IGNORE_DEVICE:
2262                         event->ignore_device = 1;
2263                         return 0;
2264                         break;
2265                 case TK_A_STRING_ESCAPE_NONE:
2266                         esc = ESCAPE_NONE;
2267                         break;
2268                 case TK_A_STRING_ESCAPE_REPLACE:
2269                         esc = ESCAPE_REPLACE;
2270                         break;
2271                 case TK_A_NUM_FAKE_PART:
2272                         if (strcmp(udev_device_get_subsystem(event->dev), "block") != 0)
2273                                 break;
2274                         if (udev_device_get_sysnum(event->dev) != NULL)
2275                                 break;
2276                         udev_device_set_num_fake_partitions(event->dev, cur->key.num_fake_part);
2277                         break;
2278                 case TK_A_INOTIFY_WATCH:
2279                         event->inotify_watch = cur->key.watch;
2280                         break;
2281                 case TK_A_DEVLINK_PRIO:
2282                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2283                         break;
2284                 case TK_A_OWNER:
2285                         {
2286                                 char owner[UTIL_NAME_SIZE];
2287
2288                                 if (event->owner_final)
2289                                         break;
2290                                 if (cur->key.op == OP_ASSIGN_FINAL)
2291                                         event->owner_final = 1;
2292                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], owner, sizeof(owner));
2293                                 event->uid = util_lookup_user(event->udev, owner);
2294                                 info(event->udev, "OWNER %u %s:%u\n",
2295                                      event->uid,
2296                                      &rules->buf[rule->rule.filename_off],
2297                                      rule->rule.filename_line);
2298                                 break;
2299                         }
2300                 case TK_A_GROUP:
2301                         {
2302                                 char group[UTIL_NAME_SIZE];
2303
2304                                 if (event->group_final)
2305                                         break;
2306                                 if (cur->key.op == OP_ASSIGN_FINAL)
2307                                         event->group_final = 1;
2308                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], group, sizeof(group));
2309                                 event->gid = util_lookup_group(event->udev, group);
2310                                 info(event->udev, "GROUP %u %s:%u\n",
2311                                      event->gid,
2312                                      &rules->buf[rule->rule.filename_off],
2313                                      rule->rule.filename_line);
2314                                 break;
2315                         }
2316                 case TK_A_MODE:
2317                         {
2318                                 char mode[UTIL_NAME_SIZE];
2319                                 char *endptr;
2320
2321                                 if (event->mode_final)
2322                                         break;
2323                                 if (cur->key.op == OP_ASSIGN_FINAL)
2324                                         event->mode_final = 1;
2325                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], mode, sizeof(mode));
2326                                 event->mode = strtol(mode, &endptr, 8);
2327                                 if (endptr[0] != '\0') {
2328                                         err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2329                                         event->mode = 0660;
2330                                 }
2331                                 info(event->udev, "MODE %#o %s:%u\n",
2332                                      event->mode,
2333                                      &rules->buf[rule->rule.filename_off],
2334                                      rule->rule.filename_line);
2335                                 break;
2336                         }
2337                 case TK_A_OWNER_ID:
2338                         if (event->owner_final)
2339                                 break;
2340                         if (cur->key.op == OP_ASSIGN_FINAL)
2341                                 event->owner_final = 1;
2342                         event->uid = cur->key.uid;
2343                         info(event->udev, "OWNER %u %s:%u\n",
2344                              event->uid,
2345                              &rules->buf[rule->rule.filename_off],
2346                              rule->rule.filename_line);
2347                         break;
2348                 case TK_A_GROUP_ID:
2349                         if (event->group_final)
2350                                 break;
2351                         if (cur->key.op == OP_ASSIGN_FINAL)
2352                                 event->group_final = 1;
2353                         event->gid = cur->key.gid;
2354                         info(event->udev, "GROUP %u %s:%u\n",
2355                              event->gid,
2356                              &rules->buf[rule->rule.filename_off],
2357                              rule->rule.filename_line);
2358                         break;
2359                 case TK_A_MODE_ID:
2360                         if (event->mode_final)
2361                                 break;
2362                         if (cur->key.op == OP_ASSIGN_FINAL)
2363                                 event->mode_final = 1;
2364                         event->mode = cur->key.mode;
2365                         info(event->udev, "MODE %#o %s:%u\n",
2366                              event->mode,
2367                              &rules->buf[rule->rule.filename_off],
2368                              rule->rule.filename_line);
2369                         break;
2370                 case TK_A_ENV:
2371                         {
2372                                 const char *name = &rules->buf[cur->key.attr_off];
2373                                 char *value = &rules->buf[cur->key.value_off];
2374
2375                                 if (value[0] != '\0') {
2376                                         char temp_value[UTIL_NAME_SIZE];
2377                                         struct udev_list_entry *entry;
2378
2379                                         udev_event_apply_format(event, value, temp_value, sizeof(temp_value));
2380                                         entry = udev_device_add_property(event->dev, name, temp_value);
2381                                         /* store in db, skip private keys */
2382                                         if (name[0] != '.')
2383                                                 udev_list_entry_set_flag(entry, 1);
2384                                 } else {
2385                                         udev_device_add_property(event->dev, name, NULL);
2386                                 }
2387                                 break;
2388                         }
2389                 case TK_A_NAME:
2390                         {
2391                                 const char *name  = &rules->buf[cur->key.value_off];
2392                                 char name_str[UTIL_PATH_SIZE];
2393                                 int count;
2394
2395                                 if (event->name_final)
2396                                         break;
2397                                 if (cur->key.op == OP_ASSIGN_FINAL)
2398                                         event->name_final = 1;
2399                                 udev_event_apply_format(event, name, name_str, sizeof(name_str));
2400                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2401                                         count = udev_util_replace_chars(name_str, "/");
2402                                         if (count > 0)
2403                                                 info(event->udev, "%i character(s) replaced\n", count);
2404                                 }
2405                                 free(event->name);
2406                                 event->name = strdup(name_str);
2407                                 info(event->udev, "NAME '%s' %s:%u\n",
2408                                      event->name,
2409                                      &rules->buf[rule->rule.filename_off],
2410                                      rule->rule.filename_line);
2411                                 break;
2412                         }
2413                 case TK_A_DEVLINK:
2414                         {
2415                                 char temp[UTIL_PATH_SIZE];
2416                                 char filename[UTIL_PATH_SIZE];
2417                                 char *pos, *next;
2418                                 int count = 0;
2419
2420                                 if (event->devlink_final)
2421                                         break;
2422                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2423                                         break;
2424                                 if (cur->key.op == OP_ASSIGN_FINAL)
2425                                         event->devlink_final = 1;
2426                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2427                                         udev_device_cleanup_devlinks_list(event->dev);
2428
2429                                 /* allow  multiple symlinks separated by spaces */
2430                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], temp, sizeof(temp));
2431                                 if (esc == ESCAPE_UNSET)
2432                                         count = udev_util_replace_chars(temp, "/ ");
2433                                 else if (esc == ESCAPE_REPLACE)
2434                                         count = udev_util_replace_chars(temp, "/");
2435                                 if (count > 0)
2436                                         info(event->udev, "%i character(s) replaced\n" , count);
2437                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2438                                 pos = temp;
2439                                 while (isspace(pos[0]))
2440                                         pos++;
2441                                 next = strchr(pos, ' ');
2442                                 while (next) {
2443                                         next[0] = '\0';
2444                                         info(event->udev, "LINK '%s' %s:%u\n",
2445                                              pos,
2446                                              &rules->buf[rule->rule.filename_off],
2447                                              rule->rule.filename_line);
2448                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2449                                         udev_device_add_devlink(event->dev, filename);
2450                                         while (isspace(next[1]))
2451                                                 next++;
2452                                         pos = &next[1];
2453                                         next = strchr(pos, ' ');
2454                                 }
2455                                 if (pos[0] != '\0') {
2456                                         info(event->udev, "LINK '%s' %s:%u\n",
2457                                              pos,
2458                                              &rules->buf[rule->rule.filename_off],
2459                                              rule->rule.filename_line);
2460                                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", pos, NULL);
2461                                         udev_device_add_devlink(event->dev, filename);
2462                                 }
2463                         }
2464                         break;
2465                 case TK_A_EVENT_TIMEOUT:
2466                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2467                         break;
2468                 case TK_A_IGNORE_REMOVE:
2469                         udev_device_set_ignore_remove(event->dev, 1);
2470                         break;
2471                 case TK_A_ATTR:
2472                         {
2473                                 const char *key_name = &rules->buf[cur->key.attr_off];
2474                                 char attr[UTIL_PATH_SIZE];
2475                                 char value[UTIL_NAME_SIZE];
2476                                 FILE *f;
2477
2478                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2479                                         util_strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2480                                 attr_subst_subdir(attr, sizeof(attr));
2481
2482                                 udev_event_apply_format(event, &rules->buf[cur->key.value_off], value, sizeof(value));
2483                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2484                                      &rules->buf[rule->rule.filename_off],
2485                                      rule->rule.filename_line);
2486                                 f = fopen(attr, "w");
2487                                 if (f != NULL) {
2488                                         if (fprintf(f, "%s", value) <= 0)
2489                                                 err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2490                                         fclose(f);
2491                                 } else {
2492                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2493                                 }
2494                                 break;
2495                         }
2496                 case TK_A_RUN:
2497                         {
2498                                 struct udev_list_entry *list_entry;
2499
2500                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2501                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2502                                 info(event->udev, "RUN '%s' %s:%u\n",
2503                                      &rules->buf[cur->key.value_off],
2504                                      &rules->buf[rule->rule.filename_off],
2505                                      rule->rule.filename_line);
2506                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2507                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2508                                 if (cur->key.ignore_error)
2509                                         udev_list_entry_set_flag(list_entry, 1);
2510                                 break;
2511                         }
2512                 case TK_A_GOTO:
2513                         if (cur->key.rule_goto == 0)
2514                                 break;
2515                         cur = &rules->tokens[cur->key.rule_goto];
2516                         continue;
2517                 case TK_A_LAST_RULE:
2518                 case TK_END:
2519                         return 0;
2520
2521                 case TK_M_PARENTS_MIN:
2522                 case TK_M_PARENTS_MAX:
2523                 case TK_M_MAX:
2524                 case TK_UNSET:
2525                         err(rules->udev, "wrong type %u\n", cur->type);
2526                         goto nomatch;
2527                 }
2528
2529                 cur++;
2530                 continue;
2531         nomatch:
2532                 /* fast-forward to next rule */
2533                 cur = rule + rule->rule.token_count;
2534                 dbg(rules->udev, "forward to rule: %u\n",
2535                                  (unsigned int) (cur - rules->tokens));
2536         }
2537 }