src/udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2003-2012 Kay Sievers <kay@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stddef.h>
  19 #include <limits.h>
  20 #include <stdlib.h>
  21 #include <stdbool.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 #include "path-util.h"
  34 #include "conf-files.h"
  35 #include "strbuf.h"
  36 #include "strv.h"
  37 #include "util.h"
  38
  39 #define PREALLOC_TOKEN          2048
  40
  41 struct uid_gid {
  42         unsigned int name_off;
  43         union {
  44                 uid_t uid;
  45                 gid_t gid;
  46         };
  47 };
  48
  49 struct udev_rules {
  50         struct udev *udev;
  51         char **dirs;
  52         usec_t *dirs_ts_usec;
  53         int resolve_names;
  54
  55         /* every key in the rules file becomes a token */
  56         struct token *tokens;
  57         unsigned int token_cur;
  58         unsigned int token_max;
  59
  60         /* all key strings are copied and de-duplicated in a single continuous string buffer */
  61         struct strbuf *strbuf;
  62
  63         /* during rule parsing, uid/gid lookup results are cached */
  64         struct uid_gid *uids;
  65         unsigned int uids_cur;
  66         unsigned int uids_max;
  67         struct uid_gid *gids;
  68         unsigned int gids_cur;
  69         unsigned int gids_max;
  70 };
  71
  72 static char *rules_str(struct udev_rules *rules, unsigned int off) {
  73         return rules->strbuf->buf + off;
  74 }
  75
  76 static unsigned int rules_add_string(struct udev_rules *rules, const char *s) {
  77         return strbuf_add_string(rules->strbuf, s, strlen(s));
  78 }
  79
  80 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  81 enum operation_type {
  82         OP_UNSET,
  83
  84         OP_MATCH,
  85         OP_NOMATCH,
  86         OP_MATCH_MAX,
  87
  88         OP_ADD,
  89         OP_ASSIGN,
  90         OP_ASSIGN_FINAL,
  91 };
  92
  93 enum string_glob_type {
  94         GL_UNSET,
  95         GL_PLAIN,                       /* no special chars */
  96         GL_GLOB,                        /* shell globs ?,*,[] */
  97         GL_SPLIT,                       /* multi-value A|B */
  98         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
  99         GL_SOMETHING,                   /* commonly used "?*" */
 100 };
 101
 102 enum string_subst_type {
 103         SB_UNSET,
 104         SB_NONE,
 105         SB_FORMAT,
 106         SB_SUBSYS,
 107 };
 108
 109 /* tokens of a rule are sorted/handled in this order */
 110 enum token_type {
 111         TK_UNSET,
 112         TK_RULE,
 113
 114         TK_M_ACTION,                    /* val */
 115         TK_M_DEVPATH,                   /* val */
 116         TK_M_KERNEL,                    /* val */
 117         TK_M_DEVLINK,                   /* val */
 118         TK_M_NAME,                      /* val */
 119         TK_M_ENV,                       /* val, attr */
 120         TK_M_TAG,                       /* val */
 121         TK_M_SUBSYSTEM,                 /* val */
 122         TK_M_DRIVER,                    /* val */
 123         TK_M_WAITFOR,                   /* val */
 124         TK_M_ATTR,                      /* val, attr */
 125
 126         TK_M_PARENTS_MIN,
 127         TK_M_KERNELS,                   /* val */
 128         TK_M_SUBSYSTEMS,                /* val */
 129         TK_M_DRIVERS,                   /* val */
 130         TK_M_ATTRS,                     /* val, attr */
 131         TK_M_TAGS,                      /* val */
 132         TK_M_PARENTS_MAX,
 133
 134         TK_M_TEST,                      /* val, mode_t */
 135         TK_M_EVENT_TIMEOUT,             /* int */
 136         TK_M_PROGRAM,                   /* val */
 137         TK_M_IMPORT_FILE,               /* val */
 138         TK_M_IMPORT_PROG,               /* val */
 139         TK_M_IMPORT_BUILTIN,            /* val */
 140         TK_M_IMPORT_DB,                 /* val */
 141         TK_M_IMPORT_CMDLINE,            /* val */
 142         TK_M_IMPORT_PARENT,             /* val */
 143         TK_M_RESULT,                    /* val */
 144         TK_M_MAX,
 145
 146         TK_A_STRING_ESCAPE_NONE,
 147         TK_A_STRING_ESCAPE_REPLACE,
 148         TK_A_DB_PERSIST,
 149         TK_A_INOTIFY_WATCH,             /* int */
 150         TK_A_DEVLINK_PRIO,              /* int */
 151         TK_A_OWNER,                     /* val */
 152         TK_A_GROUP,                     /* val */
 153         TK_A_MODE,                      /* val */
 154         TK_A_OWNER_ID,                  /* uid_t */
 155         TK_A_GROUP_ID,                  /* gid_t */
 156         TK_A_MODE_ID,                   /* mode_t */
 157         TK_A_TAG,                       /* val */
 158         TK_A_STATIC_NODE,               /* val */
 159         TK_A_ENV,                       /* val, attr */
 160         TK_A_NAME,                      /* val */
 161         TK_A_DEVLINK,                   /* val */
 162         TK_A_ATTR,                      /* val, attr */
 163         TK_A_RUN_BUILTIN,               /* val, bool */
 164         TK_A_RUN_PROGRAM,               /* val, bool */
 165         TK_A_GOTO,                      /* size_t */
 166
 167         TK_END,
 168 };
 169
 170 /* we try to pack stuff in a way that we take only 12 bytes per token */
 171 struct token {
 172         union {
 173                 unsigned char type;                /* same in rule and key */
 174                 struct {
 175                         enum token_type type:8;
 176                         bool can_set_name:1;
 177                         bool has_static_node:1;
 178                         unsigned int unused:6;
 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                                 unsigned int rule_goto;
 194                                 mode_t  mode;
 195                                 uid_t uid;
 196                                 gid_t gid;
 197                                 int devlink_prio;
 198                                 int event_timeout;
 199                                 int watch;
 200                                 enum udev_builtin_cmd builtin_cmd;
 201                         };
 202                 } key;
 203         };
 204 };
 205
 206 #define MAX_TK                64
 207 struct rule_tmp {
 208         struct udev_rules *rules;
 209         struct token rule;
 210         struct token token[MAX_TK];
 211         unsigned int token_cur;
 212 };
 213
 214 #ifdef DEBUG
 215 static const char *operation_str(enum operation_type type)
 216 {
 217         static const char *operation_strs[] = {
 218                 [OP_UNSET] =            "UNSET",
 219                 [OP_MATCH] =            "match",
 220                 [OP_NOMATCH] =          "nomatch",
 221                 [OP_MATCH_MAX] =        "MATCH_MAX",
 222
 223                 [OP_ADD] =              "add",
 224                 [OP_ASSIGN] =           "assign",
 225                 [OP_ASSIGN_FINAL] =     "assign-final",
 226 }        ;
 227
 228         return operation_strs[type];
 229 }
 230
 231 static const char *string_glob_str(enum string_glob_type type)
 232 {
 233         static const char *string_glob_strs[] = {
 234                 [GL_UNSET] =            "UNSET",
 235                 [GL_PLAIN] =            "plain",
 236                 [GL_GLOB] =             "glob",
 237                 [GL_SPLIT] =            "split",
 238                 [GL_SPLIT_GLOB] =       "split-glob",
 239                 [GL_SOMETHING] =        "split-glob",
 240         };
 241
 242         return string_glob_strs[type];
 243 }
 244
 245 static const char *token_str(enum token_type type)
 246 {
 247         static const char *token_strs[] = {
 248                 [TK_UNSET] =                    "UNSET",
 249                 [TK_RULE] =                     "RULE",
 250
 251                 [TK_M_ACTION] =                 "M ACTION",
 252                 [TK_M_DEVPATH] =                "M DEVPATH",
 253                 [TK_M_KERNEL] =                 "M KERNEL",
 254                 [TK_M_DEVLINK] =                "M DEVLINK",
 255                 [TK_M_NAME] =                   "M NAME",
 256                 [TK_M_ENV] =                    "M ENV",
 257                 [TK_M_TAG] =                    "M TAG",
 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_TAGS] =                   "M TAGS",
 269                 [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 270
 271                 [TK_M_TEST] =                   "M TEST",
 272                 [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
 273                 [TK_M_PROGRAM] =                "M PROGRAM",
 274                 [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 275                 [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 276                 [TK_M_IMPORT_BUILTIN] =         "M IMPORT_BUILTIN",
 277                 [TK_M_IMPORT_DB] =              "M IMPORT_DB",
 278                 [TK_M_IMPORT_CMDLINE] =         "M IMPORT_CMDLINE",
 279                 [TK_M_IMPORT_PARENT] =          "M IMPORT_PARENT",
 280                 [TK_M_RESULT] =                 "M RESULT",
 281                 [TK_M_MAX] =                    "M MAX",
 282
 283                 [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 284                 [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 285                 [TK_A_DB_PERSIST] =             "A DB_PERSIST",
 286                 [TK_A_INOTIFY_WATCH] =          "A INOTIFY_WATCH",
 287                 [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 288                 [TK_A_OWNER] =                  "A OWNER",
 289                 [TK_A_GROUP] =                  "A GROUP",
 290                 [TK_A_MODE] =                   "A MODE",
 291                 [TK_A_OWNER_ID] =               "A OWNER_ID",
 292                 [TK_A_GROUP_ID] =               "A GROUP_ID",
 293                 [TK_A_STATIC_NODE] =            "A STATIC_NODE",
 294                 [TK_A_MODE_ID] =                "A MODE_ID",
 295                 [TK_A_ENV] =                    "A ENV",
 296                 [TK_A_TAG] =                    "A ENV",
 297                 [TK_A_NAME] =                   "A NAME",
 298                 [TK_A_DEVLINK] =                "A DEVLINK",
 299                 [TK_A_ATTR] =                   "A ATTR",
 300                 [TK_A_RUN_BUILTIN] =            "A RUN_BUILTIN",
 301                 [TK_A_RUN_PROGRAM] =            "A RUN_PROGRAM",
 302                 [TK_A_GOTO] =                   "A GOTO",
 303
 304                 [TK_END] =                      "END",
 305         };
 306
 307         return token_strs[type];
 308 }
 309
 310 static void dump_token(struct udev_rules *rules, struct token *token)
 311 {
 312         enum token_type type = token->type;
 313         enum operation_type op = token->key.op;
 314         enum string_glob_type glob = token->key.glob;
 315         const char *value = str(rules, token->key.value_off);
 316         const char *attr = &rules->buf[token->key.attr_off];
 317
 318         switch (type) {
 319         case TK_RULE:
 320                 {
 321                         const char *tks_ptr = (char *)rules->tokens;
 322                         const char *tk_ptr = (char *)token;
 323                         unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);
 324
 325                         log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'\n",
 326                                   &rules->buf[token->rule.filename_off], token->rule.filename_line,
 327                                   idx, token->rule.token_count,
 328                                   &rules->buf[token->rule.label_off]);
 329                         break;
 330                 }
 331         case TK_M_ACTION:
 332         case TK_M_DEVPATH:
 333         case TK_M_KERNEL:
 334         case TK_M_SUBSYSTEM:
 335         case TK_M_DRIVER:
 336         case TK_M_WAITFOR:
 337         case TK_M_DEVLINK:
 338         case TK_M_NAME:
 339         case TK_M_KERNELS:
 340         case TK_M_SUBSYSTEMS:
 341         case TK_M_DRIVERS:
 342         case TK_M_TAGS:
 343         case TK_M_PROGRAM:
 344         case TK_M_IMPORT_FILE:
 345         case TK_M_IMPORT_PROG:
 346         case TK_M_IMPORT_DB:
 347         case TK_M_IMPORT_CMDLINE:
 348         case TK_M_IMPORT_PARENT:
 349         case TK_M_RESULT:
 350         case TK_A_NAME:
 351         case TK_A_DEVLINK:
 352         case TK_A_OWNER:
 353         case TK_A_GROUP:
 354         case TK_A_MODE:
 355         case TK_A_RUN_BUILTIN:
 356         case TK_A_RUN_PROGRAM:
 357                 log_debug("%s %s '%s'(%s)\n",
 358                           token_str(type), operation_str(op), value, string_glob_str(glob));
 359                 break;
 360         case TK_M_IMPORT_BUILTIN:
 361                 log_debug("%s %i '%s'\n", token_str(type), token->key.builtin_cmd, value);
 362                 break;
 363         case TK_M_ATTR:
 364         case TK_M_ATTRS:
 365         case TK_M_ENV:
 366         case TK_A_ATTR:
 367         case TK_A_ENV:
 368                 log_debug("%s %s '%s' '%s'(%s)\n",
 369                           token_str(type), operation_str(op), attr, value, string_glob_str(glob));
 370                 break;
 371         case TK_M_TAG:
 372         case TK_A_TAG:
 373                 log_debug("%s %s '%s'\n", token_str(type), operation_str(op), value);
 374                 break;
 375         case TK_A_STRING_ESCAPE_NONE:
 376         case TK_A_STRING_ESCAPE_REPLACE:
 377         case TK_A_DB_PERSIST:
 378                 log_debug("%s\n", token_str(type));
 379                 break;
 380         case TK_M_TEST:
 381                 log_debug("%s %s '%s'(%s) %#o\n",
 382                           token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
 383                 break;
 384         case TK_A_INOTIFY_WATCH:
 385                 log_debug("%s %u\n", token_str(type), token->key.watch);
 386                 break;
 387         case TK_A_DEVLINK_PRIO:
 388                 log_debug("%s %u\n", token_str(type), token->key.devlink_prio);
 389                 break;
 390         case TK_A_OWNER_ID:
 391                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.uid);
 392                 break;
 393         case TK_A_GROUP_ID:
 394                 log_debug("%s %s %u\n", token_str(type), operation_str(op), token->key.gid);
 395                 break;
 396         case TK_A_MODE_ID:
 397                 log_debug("%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);
 398                 break;
 399         case TK_A_STATIC_NODE:
 400                 log_debug("%s '%s'\n", token_str(type), value);
 401                 break;
 402         case TK_M_EVENT_TIMEOUT:
 403                 log_debug("%s %u\n", token_str(type), token->key.event_timeout);
 404                 break;
 405         case TK_A_GOTO:
 406                 log_debug("%s '%s' %u\n", token_str(type), value, token->key.rule_goto);
 407                 break;
 408         case TK_END:
 409                 log_debug("* %s\n", token_str(type));
 410                 break;
 411         case TK_M_PARENTS_MIN:
 412         case TK_M_PARENTS_MAX:
 413         case TK_M_MAX:
 414         case TK_UNSET:
 415                 log_debug("unknown type %u\n", type);
 416                 break;
 417         }
 418 }
 419
 420 static void dump_rules(struct udev_rules *rules)
 421 {
 422         unsigned int i;
 423
 424         log_debug("dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 425                   rules->token_cur,
 426                   rules->token_cur * sizeof(struct token),
 427                   rules->buf_count,
 428                   rules->buf_cur);
 429         for(i = 0; i < rules->token_cur; i++)
 430                 dump_token(rules, &rules->tokens[i]);
 431 }
 432 #else
 433 static inline const char *operation_str(enum operation_type type) { return NULL; }
 434 static inline const char *token_str(enum token_type type) { return NULL; }
 435 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 436 static inline void dump_rules(struct udev_rules *rules) {}
 437 #endif /* DEBUG */
 438
 439 static int add_token(struct udev_rules *rules, struct token *token)
 440 {
 441         /* grow buffer if needed */
 442         if (rules->token_cur+1 >= rules->token_max) {
 443                 struct token *tokens;
 444                 unsigned int add;
 445
 446                 /* double the buffer size */
 447                 add = rules->token_max;
 448                 if (add < 8)
 449                         add = 8;
 450
 451                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 452                 if (tokens == NULL)
 453                         return -1;
 454                 rules->tokens = tokens;
 455                 rules->token_max += add;
 456         }
 457         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 458         rules->token_cur++;
 459         return 0;
 460 }
 461
 462 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 463 {
 464         unsigned int i;
 465         uid_t uid;
 466         unsigned int off;
 467
 468         /* lookup, if we know it already */
 469         for (i = 0; i < rules->uids_cur; i++) {
 470                 off = rules->uids[i].name_off;
 471                 if (streq(rules_str(rules, off), owner)) {
 472                         uid = rules->uids[i].uid;
 473                         return uid;
 474                 }
 475         }
 476         uid = util_lookup_user(rules->udev, owner);
 477
 478         /* grow buffer if needed */
 479         if (rules->uids_cur+1 >= rules->uids_max) {
 480                 struct uid_gid *uids;
 481                 unsigned int add;
 482
 483                 /* double the buffer size */
 484                 add = rules->uids_max;
 485                 if (add < 1)
 486                         add = 8;
 487
 488                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 489                 if (uids == NULL)
 490                         return uid;
 491                 rules->uids = uids;
 492                 rules->uids_max += add;
 493         }
 494         rules->uids[rules->uids_cur].uid = uid;
 495         off = rules_add_string(rules, owner);
 496         if (off <= 0)
 497                 return uid;
 498         rules->uids[rules->uids_cur].name_off = off;
 499         rules->uids_cur++;
 500         return uid;
 501 }
 502
 503 static gid_t add_gid(struct udev_rules *rules, const char *group)
 504 {
 505         unsigned int i;
 506         gid_t gid;
 507         unsigned int off;
 508
 509         /* lookup, if we know it already */
 510         for (i = 0; i < rules->gids_cur; i++) {
 511                 off = rules->gids[i].name_off;
 512                 if (streq(rules_str(rules, off), group)) {
 513                         gid = rules->gids[i].gid;
 514                         return gid;
 515                 }
 516         }
 517         gid = util_lookup_group(rules->udev, group);
 518
 519         /* grow buffer if needed */
 520         if (rules->gids_cur+1 >= rules->gids_max) {
 521                 struct uid_gid *gids;
 522                 unsigned int add;
 523
 524                 /* double the buffer size */
 525                 add = rules->gids_max;
 526                 if (add < 1)
 527                         add = 8;
 528
 529                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 530                 if (gids == NULL)
 531                         return gid;
 532                 rules->gids = gids;
 533                 rules->gids_max += add;
 534         }
 535         rules->gids[rules->gids_cur].gid = gid;
 536         off = rules_add_string(rules, group);
 537         if (off <= 0)
 538                 return gid;
 539         rules->gids[rules->gids_cur].name_off = off;
 540         rules->gids_cur++;
 541         return gid;
 542 }
 543
 544 static int import_property_from_string(struct udev_device *dev, char *line)
 545 {
 546         char *key;
 547         char *val;
 548         size_t len;
 549
 550         /* find key */
 551         key = line;
 552         while (isspace(key[0]))
 553                 key++;
 554
 555         /* comment or empty line */
 556         if (key[0] == '#' || key[0] == '\0')
 557                 return -1;
 558
 559         /* split key/value */
 560         val = strchr(key, '=');
 561         if (val == NULL)
 562                 return -1;
 563         val[0] = '\0';
 564         val++;
 565
 566         /* find value */
 567         while (isspace(val[0]))
 568                 val++;
 569
 570         /* terminate key */
 571         len = strlen(key);
 572         if (len == 0)
 573                 return -1;
 574         while (isspace(key[len-1]))
 575                 len--;
 576         key[len] = '\0';
 577
 578         /* terminate value */
 579         len = strlen(val);
 580         if (len == 0)
 581                 return -1;
 582         while (isspace(val[len-1]))
 583                 len--;
 584         val[len] = '\0';
 585
 586         if (len == 0)
 587                 return -1;
 588
 589         /* unquote */
 590         if (val[0] == '"' || val[0] == '\'') {
 591                 if (val[len-1] != val[0]) {
 592                         log_debug("inconsistent quoting: '%s', skip\n", line);
 593                         return -1;
 594                 }
 595                 val[len-1] = '\0';
 596                 val++;
 597         }
 598
 599         /* handle device, renamed by external tool, returning new path */
 600         if (streq(key, "DEVPATH")) {
 601                 char syspath[UTIL_PATH_SIZE];
 602
 603                 log_debug("updating devpath from '%s' to '%s'\n",
 604                           udev_device_get_devpath(dev), val);
 605                 strscpyl(syspath, sizeof(syspath), "/sys", val, NULL);
 606                 udev_device_set_syspath(dev, syspath);
 607         } else {
 608                 struct udev_list_entry *entry;
 609
 610                 entry = udev_device_add_property(dev, key, val);
 611                 /* store in db, skip private keys */
 612                 if (key[0] != '.')
 613                         udev_list_entry_set_num(entry, true);
 614         }
 615         return 0;
 616 }
 617
 618 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 619 {
 620         FILE *f;
 621         char line[UTIL_LINE_SIZE];
 622
 623         f = fopen(filename, "re");
 624         if (f == NULL)
 625                 return -1;
 626         while (fgets(line, sizeof(line), f) != NULL)
 627                 import_property_from_string(dev, line);
 628         fclose(f);
 629         return 0;
 630 }
 631
 632 static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 633 {
 634         struct udev_device *dev = event->dev;
 635         char **envp;
 636         char result[UTIL_LINE_SIZE];
 637         char *line;
 638         int err;
 639
 640         envp = udev_device_get_properties_envp(dev);
 641         err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
 642         if (err < 0)
 643                 return err;
 644
 645         line = result;
 646         while (line != NULL) {
 647                 char *pos;
 648
 649                 pos = strchr(line, '\n');
 650                 if (pos != NULL) {
 651                         pos[0] = '\0';
 652                         pos = &pos[1];
 653                 }
 654                 import_property_from_string(dev, line);
 655                 line = pos;
 656         }
 657         return 0;
 658 }
 659
 660 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 661 {
 662         struct udev_device *dev_parent;
 663         struct udev_list_entry *list_entry;
 664
 665         dev_parent = udev_device_get_parent(dev);
 666         if (dev_parent == NULL)
 667                 return -1;
 668
 669         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 670                 const char *key = udev_list_entry_get_name(list_entry);
 671                 const char *val = udev_list_entry_get_value(list_entry);
 672
 673                 if (fnmatch(filter, key, 0) == 0) {
 674                         struct udev_list_entry *entry;
 675
 676                         entry = udev_device_add_property(dev, key, val);
 677                         /* store in db, skip private keys */
 678                         if (key[0] != '.')
 679                                 udev_list_entry_set_num(entry, true);
 680                 }
 681         }
 682         return 0;
 683 }
 684
 685 #define WAIT_LOOP_PER_SECOND                50
 686 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 687 {
 688         char filepath[UTIL_PATH_SIZE];
 689         char devicepath[UTIL_PATH_SIZE];
 690         struct stat stats;
 691         int loop = timeout * WAIT_LOOP_PER_SECOND;
 692
 693         /* a relative path is a device attribute */
 694         devicepath[0] = '\0';
 695         if (file[0] != '/') {
 696                 strscpyl(devicepath, sizeof(devicepath), udev_device_get_syspath(dev), NULL);
 697                 strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
 698                 file = filepath;
 699         }
 700
 701         while (--loop) {
 702                 const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
 703
 704                 /* lookup file */
 705                 if (stat(file, &stats) == 0) {
 706                         log_debug("file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 707                         return 0;
 708                 }
 709                 /* make sure, the device did not disappear in the meantime */
 710                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 711                         log_debug("device disappeared while waiting for '%s'\n", file);
 712                         return -2;
 713                 }
 714                 log_debug("wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 715                 nanosleep(&duration, NULL);
 716         }
 717         log_debug("waiting for '%s' failed\n", file);
 718         return -1;
 719 }
 720
 721 static int attr_subst_subdir(char *attr, size_t len)
 722 {
 723         bool found = false;
 724
 725         if (strstr(attr, "/*/")) {
 726                 char *pos;
 727                 char dirname[UTIL_PATH_SIZE];
 728                 const char *tail;
 729                 DIR *dir;
 730
 731                 strscpy(dirname, sizeof(dirname), attr);
 732                 pos = strstr(dirname, "/*/");
 733                 if (pos == NULL)
 734                         return -1;
 735                 pos[0] = '\0';
 736                 tail = &pos[2];
 737                 dir = opendir(dirname);
 738                 if (dir != NULL) {
 739                         struct dirent *dent;
 740
 741                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 742                                 struct stat stats;
 743
 744                                 if (dent->d_name[0] == '.')
 745                                         continue;
 746                                 strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);
 747                                 if (stat(attr, &stats) == 0) {
 748                                         found = true;
 749                                         break;
 750                                 }
 751                         }
 752                         closedir(dir);
 753                 }
 754         }
 755
 756         return found;
 757 }
 758
 759 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 760 {
 761         char *linepos;
 762         char *temp;
 763
 764         linepos = *line;
 765         if (linepos == NULL || linepos[0] == '\0')
 766                 return -1;
 767
 768         /* skip whitespace */
 769         while (isspace(linepos[0]) || linepos[0] == ',')
 770                 linepos++;
 771
 772         /* get the key */
 773         if (linepos[0] == '\0')
 774                 return -1;
 775         *key = linepos;
 776
 777         for (;;) {
 778                 linepos++;
 779                 if (linepos[0] == '\0')
 780                         return -1;
 781                 if (isspace(linepos[0]))
 782                         break;
 783                 if (linepos[0] == '=')
 784                         break;
 785                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 786                         if (linepos[1] == '=')
 787                                 break;
 788         }
 789
 790         /* remember end of key */
 791         temp = linepos;
 792
 793         /* skip whitespace after key */
 794         while (isspace(linepos[0]))
 795                 linepos++;
 796         if (linepos[0] == '\0')
 797                 return -1;
 798
 799         /* get operation type */
 800         if (linepos[0] == '=' && linepos[1] == '=') {
 801                 *op = OP_MATCH;
 802                 linepos += 2;
 803         } else if (linepos[0] == '!' && linepos[1] == '=') {
 804                 *op = OP_NOMATCH;
 805                 linepos += 2;
 806         } else if (linepos[0] == '+' && linepos[1] == '=') {
 807                 *op = OP_ADD;
 808                 linepos += 2;
 809         } else if (linepos[0] == '=') {
 810                 *op = OP_ASSIGN;
 811                 linepos++;
 812         } else if (linepos[0] == ':' && linepos[1] == '=') {
 813                 *op = OP_ASSIGN_FINAL;
 814                 linepos += 2;
 815         } else
 816                 return -1;
 817
 818         /* terminate key */
 819         temp[0] = '\0';
 820
 821         /* skip whitespace after operator */
 822         while (isspace(linepos[0]))
 823                 linepos++;
 824         if (linepos[0] == '\0')
 825                 return -1;
 826
 827         /* get the value */
 828         if (linepos[0] == '"')
 829                 linepos++;
 830         else
 831                 return -1;
 832         *value = linepos;
 833
 834         /* terminate */
 835         temp = strchr(linepos, '"');
 836         if (!temp)
 837                 return -1;
 838         temp[0] = '\0';
 839         temp++;
 840
 841         /* move line to next key */
 842         *line = temp;
 843         return 0;
 844 }
 845
 846 /* extract possible KEY{attr} */
 847 static const char *get_key_attribute(struct udev *udev, char *str)
 848 {
 849         char *pos;
 850         char *attr;
 851
 852         attr = strchr(str, '{');
 853         if (attr != NULL) {
 854                 attr++;
 855                 pos = strchr(attr, '}');
 856                 if (pos == NULL) {
 857                         log_error("missing closing brace for format\n");
 858                         return NULL;
 859                 }
 860                 pos[0] = '\0';
 861                 return attr;
 862         }
 863         return NULL;
 864 }
 865
 866 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 867                         enum operation_type op,
 868                         const char *value, const void *data)
 869 {
 870         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 871         const char *attr = NULL;
 872
 873         memset(token, 0x00, sizeof(struct token));
 874
 875         switch (type) {
 876         case TK_M_ACTION:
 877         case TK_M_DEVPATH:
 878         case TK_M_KERNEL:
 879         case TK_M_SUBSYSTEM:
 880         case TK_M_DRIVER:
 881         case TK_M_WAITFOR:
 882         case TK_M_DEVLINK:
 883         case TK_M_NAME:
 884         case TK_M_KERNELS:
 885         case TK_M_SUBSYSTEMS:
 886         case TK_M_DRIVERS:
 887         case TK_M_TAGS:
 888         case TK_M_PROGRAM:
 889         case TK_M_IMPORT_FILE:
 890         case TK_M_IMPORT_PROG:
 891         case TK_M_IMPORT_DB:
 892         case TK_M_IMPORT_CMDLINE:
 893         case TK_M_IMPORT_PARENT:
 894         case TK_M_RESULT:
 895         case TK_A_OWNER:
 896         case TK_A_GROUP:
 897         case TK_A_MODE:
 898         case TK_A_DEVLINK:
 899         case TK_A_NAME:
 900         case TK_A_GOTO:
 901         case TK_M_TAG:
 902         case TK_A_TAG:
 903                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
 904                 break;
 905         case TK_M_IMPORT_BUILTIN:
 906                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
 907                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
 908                 break;
 909         case TK_M_ENV:
 910         case TK_M_ATTR:
 911         case TK_M_ATTRS:
 912         case TK_A_ATTR:
 913         case TK_A_ENV:
 914                 attr = data;
 915                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
 916                 token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
 917                 break;
 918         case TK_M_TEST:
 919                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
 920                 if (data != NULL)
 921                         token->key.mode = *(mode_t *)data;
 922                 break;
 923         case TK_A_STRING_ESCAPE_NONE:
 924         case TK_A_STRING_ESCAPE_REPLACE:
 925         case TK_A_DB_PERSIST:
 926                 break;
 927         case TK_A_RUN_BUILTIN:
 928         case TK_A_RUN_PROGRAM:
 929                 token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
 930                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
 931                 break;
 932         case TK_A_INOTIFY_WATCH:
 933         case TK_A_DEVLINK_PRIO:
 934                 token->key.devlink_prio = *(int *)data;
 935                 break;
 936         case TK_A_OWNER_ID:
 937                 token->key.uid = *(uid_t *)data;
 938                 break;
 939         case TK_A_GROUP_ID:
 940                 token->key.gid = *(gid_t *)data;
 941                 break;
 942         case TK_A_MODE_ID:
 943                 token->key.mode = *(mode_t *)data;
 944                 break;
 945         case TK_A_STATIC_NODE:
 946                 token->key.value_off = rules_add_string(rule_tmp->rules, value);
 947                 break;
 948         case TK_M_EVENT_TIMEOUT:
 949                 token->key.event_timeout = *(int *)data;
 950                 break;
 951         case TK_RULE:
 952         case TK_M_PARENTS_MIN:
 953         case TK_M_PARENTS_MAX:
 954         case TK_M_MAX:
 955         case TK_END:
 956         case TK_UNSET:
 957                 log_error("wrong type %u\n", type);
 958                 return -1;
 959         }
 960
 961         if (value != NULL && type < TK_M_MAX) {
 962                 /* check if we need to split or call fnmatch() while matching rules */
 963                 enum string_glob_type glob;
 964                 int has_split;
 965                 int has_glob;
 966
 967                 has_split = (strchr(value, '|') != NULL);
 968                 has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);
 969                 if (has_split && has_glob) {
 970                         glob = GL_SPLIT_GLOB;
 971                 } else if (has_split) {
 972                         glob = GL_SPLIT;
 973                 } else if (has_glob) {
 974                         if (streq(value, "?*"))
 975                                 glob = GL_SOMETHING;
 976                         else
 977                                 glob = GL_GLOB;
 978                 } else {
 979                         glob = GL_PLAIN;
 980                 }
 981                 token->key.glob = glob;
 982         }
 983
 984         if (value != NULL && type > TK_M_MAX) {
 985                 /* check if assigned value has substitution chars */
 986                 if (value[0] == '[')
 987                         token->key.subst = SB_SUBSYS;
 988                 else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
 989                         token->key.subst = SB_FORMAT;
 990                 else
 991                         token->key.subst = SB_NONE;
 992         }
 993
 994         if (attr != NULL) {
 995                 /* check if property/attribut name has substitution chars */
 996                 if (attr[0] == '[')
 997                         token->key.attrsubst = SB_SUBSYS;
 998                 else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
 999                         token->key.attrsubst = SB_FORMAT;
1000                 else
1001                         token->key.attrsubst = SB_NONE;
1002         }
1003
1004         token->key.type = type;
1005         token->key.op = op;
1006         rule_tmp->token_cur++;
1007         if (rule_tmp->token_cur >= ELEMENTSOF(rule_tmp->token)) {
1008                 log_error("temporary rule array too small\n");
1009                 return -1;
1010         }
1011         return 0;
1012 }
1013
1014 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
1015 {
1016         unsigned int i;
1017         unsigned int start = 0;
1018         unsigned int end = rule_tmp->token_cur;
1019
1020         for (i = 0; i < rule_tmp->token_cur; i++) {
1021                 enum token_type next_val = TK_UNSET;
1022                 unsigned int next_idx = 0;
1023                 unsigned int j;
1024
1025                 /* find smallest value */
1026                 for (j = start; j < end; j++) {
1027                         if (rule_tmp->token[j].type == TK_UNSET)
1028                                 continue;
1029                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
1030                                 next_val = rule_tmp->token[j].type;
1031                                 next_idx = j;
1032                         }
1033                 }
1034
1035                 /* add token and mark done */
1036                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1037                         return -1;
1038                 rule_tmp->token[next_idx].type = TK_UNSET;
1039
1040                 /* shrink range */
1041                 if (next_idx == start)
1042                         start++;
1043                 if (next_idx+1 == end)
1044                         end--;
1045         }
1046         return 0;
1047 }
1048
1049 static int add_rule(struct udev_rules *rules, char *line,
1050                     const char *filename, unsigned int filename_off, unsigned int lineno)
1051 {
1052         char *linepos;
1053         const char *attr;
1054         struct rule_tmp rule_tmp;
1055
1056         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1057         rule_tmp.rules = rules;
1058         rule_tmp.rule.type = TK_RULE;
1059         /* the offset in the rule is limited to unsigned short */
1060         if (filename_off < USHRT_MAX)
1061                 rule_tmp.rule.rule.filename_off = filename_off;
1062         rule_tmp.rule.rule.filename_line = lineno;
1063
1064         linepos = line;
1065         for (;;) {
1066                 char *key;
1067                 char *value;
1068                 enum operation_type op;
1069
1070                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0) {
1071                         /* Avoid erroring on trailing whitespace. This is probably rare
1072                          * so save the work for the error case instead of always trying
1073                          * to strip the trailing whitespace with strstrip(). */
1074                         while (isblank(*linepos))
1075                                 linepos++;
1076
1077                         /* If we aren't at the end of the line, this is a parsing error.
1078                          * Make a best effort to describe where the problem is. */
1079                         if (*linepos != '\n') {
1080                                 char buf[2] = {linepos[1]};
1081                                 _cleanup_free_ char *tmp;
1082
1083                                 tmp = cescape(buf);
1084                                 log_error("invalid key/value pair in file %s on line %u,"
1085                                           "starting at character %tu ('%s')\n",
1086                                           filename, lineno, linepos - line + 1, tmp);
1087                                 if (linepos[1] == '#')
1088                                         log_info("hint: comments can only start at beginning of line");
1089                         }
1090                         break;
1091                 }
1092
1093                 if (streq(key, "ACTION")) {
1094                         if (op > OP_MATCH_MAX) {
1095                                 log_error("invalid ACTION operation\n");
1096                                 goto invalid;
1097                         }
1098                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1099                         continue;
1100                 }
1101
1102                 if (streq(key, "DEVPATH")) {
1103                         if (op > OP_MATCH_MAX) {
1104                                 log_error("invalid DEVPATH operation\n");
1105                                 goto invalid;
1106                         }
1107                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1108                         continue;
1109                 }
1110
1111                 if (streq(key, "KERNEL")) {
1112                         if (op > OP_MATCH_MAX) {
1113                                 log_error("invalid KERNEL operation\n");
1114                                 goto invalid;
1115                         }
1116                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1117                         continue;
1118                 }
1119
1120                 if (streq(key, "SUBSYSTEM")) {
1121                         if (op > OP_MATCH_MAX) {
1122                                 log_error("invalid SUBSYSTEM operation\n");
1123                                 goto invalid;
1124                         }
1125                         /* bus, class, subsystem events should all be the same */
1126                         if (streq(value, "subsystem") ||
1127                             streq(value, "bus") ||
1128                             streq(value, "class")) {
1129                                 if (streq(value, "bus") || streq(value, "class"))
1130                                         log_error("'%s' must be specified as 'subsystem' \n"
1131                                             "please fix it in %s:%u", value, filename, lineno);
1132                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1133                         } else
1134                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1135                         continue;
1136                 }
1137
1138                 if (streq(key, "DRIVER")) {
1139                         if (op > OP_MATCH_MAX) {
1140                                 log_error("invalid DRIVER operation\n");
1141                                 goto invalid;
1142                         }
1143                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1144                         continue;
1145                 }
1146
1147                 if (startswith(key, "ATTR{")) {
1148                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1149                         if (attr == NULL) {
1150                                 log_error("error parsing ATTR attribute\n");
1151                                 goto invalid;
1152                         }
1153                         if (op < OP_MATCH_MAX) {
1154                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1155                         } else {
1156                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1157                         }
1158                         continue;
1159                 }
1160
1161                 if (streq(key, "KERNELS")) {
1162                         if (op > OP_MATCH_MAX) {
1163                                 log_error("invalid KERNELS operation\n");
1164                                 goto invalid;
1165                         }
1166                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1167                         continue;
1168                 }
1169
1170                 if (streq(key, "SUBSYSTEMS")) {
1171                         if (op > OP_MATCH_MAX) {
1172                                 log_error("invalid SUBSYSTEMS operation\n");
1173                                 goto invalid;
1174                         }
1175                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1176                         continue;
1177                 }
1178
1179                 if (streq(key, "DRIVERS")) {
1180                         if (op > OP_MATCH_MAX) {
1181                                 log_error("invalid DRIVERS operation\n");
1182                                 goto invalid;
1183                         }
1184                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1185                         continue;
1186                 }
1187
1188                 if (startswith(key, "ATTRS{")) {
1189                         if (op > OP_MATCH_MAX) {
1190                                 log_error("invalid ATTRS operation\n");
1191                                 goto invalid;
1192                         }
1193                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1194                         if (attr == NULL) {
1195                                 log_error("error parsing ATTRS attribute\n");
1196                                 goto invalid;
1197                         }
1198                         if (startswith(attr, "device/"))
1199                                 log_error("the 'device' link may not be available in a future kernel, "
1200                                     "please fix it in %s:%u", filename, lineno);
1201                         else if (strstr(attr, "../") != NULL)
1202                                 log_error("do not reference parent sysfs directories directly, "
1203                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1204                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1205                         continue;
1206                 }
1207
1208                 if (streq(key, "TAGS")) {
1209                         if (op > OP_MATCH_MAX) {
1210                                 log_error("invalid TAGS operation\n");
1211                                 goto invalid;
1212                         }
1213                         rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
1214                         continue;
1215                 }
1216
1217                 if (startswith(key, "ENV{")) {
1218                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1219                         if (attr == NULL) {
1220                                 log_error("error parsing ENV attribute\n");
1221                                 goto invalid;
1222                         }
1223                         if (op < OP_MATCH_MAX) {
1224                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1225                                         goto invalid;
1226                         } else {
1227                                 static const char *blacklist[] = {
1228                                         "ACTION",
1229                                         "SUBSYSTEM",
1230                                         "DEVTYPE",
1231                                         "MAJOR",
1232                                         "MINOR",
1233                                         "DRIVER",
1234                                         "IFINDEX",
1235                                         "DEVNAME",
1236                                         "DEVLINKS",
1237                                         "DEVPATH",
1238                                         "TAGS",
1239                                 };
1240                                 unsigned int i;
1241
1242                                 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
1243                                         if (!streq(attr, blacklist[i]))
1244                                                 continue;
1245                                         log_error("invalid ENV attribute, '%s' can not be set %s:%u\n", attr, filename, lineno);
1246                                         goto invalid;
1247                                 }
1248                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1249                                         goto invalid;
1250                         }
1251                         continue;
1252                 }
1253
1254                 if (streq(key, "TAG")) {
1255                         if (op < OP_MATCH_MAX)
1256                                 rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);
1257                         else
1258                                 rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);
1259                         continue;
1260                 }
1261
1262                 if (streq(key, "PROGRAM")) {
1263                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1264                         continue;
1265                 }
1266
1267                 if (streq(key, "RESULT")) {
1268                         if (op > OP_MATCH_MAX) {
1269                                 log_error("invalid RESULT operation\n");
1270                                 goto invalid;
1271                         }
1272                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1273                         continue;
1274                 }
1275
1276                 if (startswith(key, "IMPORT")) {
1277                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1278                         if (attr == NULL) {
1279                                 log_error("IMPORT{} type missing, ignoring IMPORT %s:%u\n", filename, lineno);
1280                                 continue;
1281                         }
1282                         if (streq(attr, "program")) {
1283                                 /* find known built-in command */
1284                                 if (value[0] != '/') {
1285                                         enum udev_builtin_cmd cmd;
1286
1287                                         cmd = udev_builtin_lookup(value);
1288                                         if (cmd < UDEV_BUILTIN_MAX) {
1289                                                 log_debug("IMPORT found builtin '%s', replacing %s:%u\n",
1290                                                           value, filename, lineno);
1291                                                 rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1292                                                 continue;
1293                                         }
1294                                 }
1295                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1296                         } else if (streq(attr, "builtin")) {
1297                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1298
1299                                 if (cmd < UDEV_BUILTIN_MAX)
1300                                         rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
1301                                 else
1302                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1303                         } else if (streq(attr, "file")) {
1304                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1305                         } else if (streq(attr, "db")) {
1306                                 rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
1307                         } else if (streq(attr, "cmdline")) {
1308                                 rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
1309                         } else if (streq(attr, "parent")) {
1310                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1311                         } else
1312                                 log_error("IMPORT{} unknown type, ignoring IMPORT %s:%u\n", filename, lineno);
1313                         continue;
1314                 }
1315
1316                 if (startswith(key, "TEST")) {
1317                         mode_t mode = 0;
1318
1319                         if (op > OP_MATCH_MAX) {
1320                                 log_error("invalid TEST operation\n");
1321                                 goto invalid;
1322                         }
1323                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1324                         if (attr != NULL) {
1325                                 mode = strtol(attr, NULL, 8);
1326                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1327                         } else {
1328                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1329                         }
1330                         continue;
1331                 }
1332
1333                 if (startswith(key, "RUN")) {
1334                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1335                         if (attr == NULL)
1336                                 attr = "program";
1337
1338                         if (streq(attr, "builtin")) {
1339                                 enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
1340
1341                                 if (cmd < UDEV_BUILTIN_MAX)
1342                                         rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
1343                                 else
1344                                         log_error("IMPORT{builtin}: '%s' unknown %s:%u\n", value, filename, lineno);
1345                         } else if (streq(attr, "program")) {
1346                                 enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
1347
1348                                 rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
1349                         } else {
1350                                 log_error("RUN{} unknown type, ignoring RUN %s:%u\n", filename, lineno);
1351                         }
1352
1353                         continue;
1354                 }
1355
1356                 if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
1357                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1358                         continue;
1359                 }
1360
1361                 if (streq(key, "LABEL")) {
1362                         rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
1363                         continue;
1364                 }
1365
1366                 if (streq(key, "GOTO")) {
1367                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1368                         continue;
1369                 }
1370
1371                 if (startswith(key, "NAME")) {
1372                         if (op < OP_MATCH_MAX) {
1373                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1374                         } else {
1375                                 if (streq(value, "%k")) {
1376                                         log_error("NAME=\"%%k\" is ignored, because it breaks kernel supplied names, "
1377                                             "please remove it from %s:%u\n", filename, lineno);
1378                                         continue;
1379                                 }
1380                                 if (value[0] == '\0') {
1381                                         log_debug("NAME=\"\" is ignored, because udev will not delete any device nodes, "
1382                                                   "please remove it from %s:%u\n", filename, lineno);
1383                                         continue;
1384                                 }
1385                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1386                         }
1387                         rule_tmp.rule.rule.can_set_name = true;
1388                         continue;
1389                 }
1390
1391                 if (streq(key, "SYMLINK")) {
1392                         if (op < OP_MATCH_MAX)
1393                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1394                         else
1395                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1396                         rule_tmp.rule.rule.can_set_name = true;
1397                         continue;
1398                 }
1399
1400                 if (streq(key, "OWNER")) {
1401                         uid_t uid;
1402                         char *endptr;
1403
1404                         uid = strtoul(value, &endptr, 10);
1405                         if (endptr[0] == '\0') {
1406                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1407                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1408                                 uid = add_uid(rules, value);
1409                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1410                         } else if (rules->resolve_names >= 0) {
1411                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1412                         }
1413                         rule_tmp.rule.rule.can_set_name = true;
1414                         continue;
1415                 }
1416
1417                 if (streq(key, "GROUP")) {
1418                         gid_t gid;
1419                         char *endptr;
1420
1421                         gid = strtoul(value, &endptr, 10);
1422                         if (endptr[0] == '\0') {
1423                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1424                         } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {
1425                                 gid = add_gid(rules, value);
1426                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1427                         } else if (rules->resolve_names >= 0) {
1428                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1429                         }
1430                         rule_tmp.rule.rule.can_set_name = true;
1431                         continue;
1432                 }
1433
1434                 if (streq(key, "MODE")) {
1435                         mode_t mode;
1436                         char *endptr;
1437
1438                         mode = strtol(value, &endptr, 8);
1439                         if (endptr[0] == '\0')
1440                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1441                         else
1442                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1443                         rule_tmp.rule.rule.can_set_name = true;
1444                         continue;
1445                 }
1446
1447                 if (streq(key, "OPTIONS")) {
1448                         const char *pos;
1449
1450                         pos = strstr(value, "link_priority=");
1451                         if (pos != NULL) {
1452                                 int prio = atoi(&pos[strlen("link_priority=")]);
1453
1454                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
1455                         }
1456
1457                         pos = strstr(value, "event_timeout=");
1458                         if (pos != NULL) {
1459                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1460
1461                                 rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
1462                         }
1463
1464                         pos = strstr(value, "string_escape=");
1465                         if (pos != NULL) {
1466                                 pos = &pos[strlen("string_escape=")];
1467                                 if (startswith(pos, "none"))
1468                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
1469                                 else if (startswith(pos, "replace"))
1470                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
1471                         }
1472
1473                         pos = strstr(value, "db_persist");
1474                         if (pos != NULL)
1475                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
1476
1477                         pos = strstr(value, "nowatch");
1478                         if (pos != NULL) {
1479                                 const int off = 0;
1480
1481                                 rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
1482                         } else {
1483                                 pos = strstr(value, "watch");
1484                                 if (pos != NULL) {
1485                                         const int on = 1;
1486
1487                                         rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
1488                                 }
1489                         }
1490
1491                         pos = strstr(value, "static_node=");
1492                         if (pos != NULL) {
1493                                 rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, &pos[strlen("static_node=")], NULL);
1494                                 rule_tmp.rule.rule.has_static_node = true;
1495                         }
1496
1497                         continue;
1498                 }
1499
1500                 log_error("unknown key '%s' in %s:%u\n", key, filename, lineno);
1501                 goto invalid;
1502         }
1503
1504         /* add rule token */
1505         rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
1506         if (add_token(rules, &rule_tmp.rule) != 0)
1507                 goto invalid;
1508
1509         /* add tokens to list, sorted by type */
1510         if (sort_token(rules, &rule_tmp) != 0)
1511                 goto invalid;
1512
1513         return 0;
1514 invalid:
1515         log_error("invalid rule '%s:%u'\n", filename, lineno);
1516         return -1;
1517 }
1518
1519 static int parse_file(struct udev_rules *rules, const char *filename)
1520 {
1521         FILE *f;
1522         unsigned int first_token;
1523         unsigned int filename_off;
1524         char line[UTIL_LINE_SIZE];
1525         int line_nr = 0;
1526         unsigned int i;
1527
1528         if (null_or_empty_path(filename)) {
1529                 log_debug("skip empty file: %s\n", filename);
1530                 return 0;
1531         }
1532         log_debug("read rules file: %s\n", filename);
1533
1534         f = fopen(filename, "re");
1535         if (f == NULL)
1536                 return -1;
1537
1538         first_token = rules->token_cur;
1539         filename_off = rules_add_string(rules, filename);
1540
1541         while (fgets(line, sizeof(line), f) != NULL) {
1542                 char *key;
1543                 size_t len;
1544
1545                 /* skip whitespace */
1546                 line_nr++;
1547                 key = line;
1548                 while (isspace(key[0]))
1549                         key++;
1550
1551                 /* comment */
1552                 if (key[0] == '#')
1553                         continue;
1554
1555                 len = strlen(line);
1556                 if (len < 3)
1557                         continue;
1558
1559                 /* continue reading if backslash+newline is found */
1560                 while (line[len-2] == '\\') {
1561                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1562                                 break;
1563                         if (strlen(&line[len-2]) < 2)
1564                                 break;
1565                         line_nr++;
1566                         len = strlen(line);
1567                 }
1568
1569                 if (len+1 >= sizeof(line)) {
1570                         log_error("line too long '%s':%u, ignored\n", filename, line_nr);
1571                         continue;
1572                 }
1573                 add_rule(rules, key, filename, filename_off, line_nr);
1574         }
1575         fclose(f);
1576
1577         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1578         for (i = first_token+1; i < rules->token_cur; i++) {
1579                 if (rules->tokens[i].type == TK_A_GOTO) {
1580                         char *label = rules_str(rules, rules->tokens[i].key.value_off);
1581                         unsigned int j;
1582
1583                         for (j = i+1; j < rules->token_cur; j++) {
1584                                 if (rules->tokens[j].type != TK_RULE)
1585                                         continue;
1586                                 if (rules->tokens[j].rule.label_off == 0)
1587                                         continue;
1588                                 if (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
1589                                         continue;
1590                                 rules->tokens[i].key.rule_goto = j;
1591                                 break;
1592                         }
1593                         if (rules->tokens[i].key.rule_goto == 0)
1594                                 log_error("GOTO '%s' has no matching label in: '%s'\n", label, filename);
1595                 }
1596         }
1597         return 0;
1598 }
1599
1600 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1601 {
1602         struct udev_rules *rules;
1603         struct udev_list file_list;
1604         struct token end_token;
1605         char **files, **f;
1606         int r;
1607
1608         rules = calloc(1, sizeof(struct udev_rules));
1609         if (rules == NULL)
1610                 return NULL;
1611         rules->udev = udev;
1612         rules->resolve_names = resolve_names;
1613         udev_list_init(udev, &file_list, true);
1614
1615         /* init token array and string buffer */
1616         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1617         if (rules->tokens == NULL)
1618                 return udev_rules_unref(rules);
1619         rules->token_max = PREALLOC_TOKEN;
1620
1621         rules->strbuf = strbuf_new();
1622         if (!rules->strbuf)
1623                 return udev_rules_unref(rules);
1624
1625         rules->dirs = strv_new("/etc/udev/rules.d",
1626                                "/run/udev/rules.d",
1627                                UDEVLIBEXECDIR "/rules.d",
1628                                NULL);
1629         if (!rules->dirs) {
1630                 log_error("failed to build config directory array");
1631                 return udev_rules_unref(rules);
1632         }
1633         if (!path_strv_canonicalize(rules->dirs)) {
1634                 log_error("failed to canonicalize config directories\n");
1635                 return udev_rules_unref(rules);
1636         }
1637         strv_uniq(rules->dirs);
1638
1639         rules->dirs_ts_usec = calloc(strv_length(rules->dirs), sizeof(usec_t));
1640         if(!rules->dirs_ts_usec)
1641                 return udev_rules_unref(rules);
1642         udev_rules_check_timestamp(rules);
1643
1644         r = conf_files_list_strv(&files, ".rules", NULL, (const char **)rules->dirs);
1645         if (r < 0) {
1646                 log_error("failed to enumerate rules files: %s\n", strerror(-r));
1647                 return udev_rules_unref(rules);
1648         }
1649
1650         /*
1651          * The offset value in the rules strct is limited; add all
1652          * rules file names to the beginning of the string buffer.
1653          */
1654         STRV_FOREACH(f, files)
1655                 rules_add_string(rules, *f);
1656
1657         STRV_FOREACH(f, files)
1658                 parse_file(rules, *f);
1659
1660         strv_free(files);
1661
1662         memset(&end_token, 0x00, sizeof(struct token));
1663         end_token.type = TK_END;
1664         add_token(rules, &end_token);
1665         log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings\n",
1666                   rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
1667
1668         /* cleanup temporary strbuf data */
1669         log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used\n",
1670                   rules->strbuf->in_count, rules->strbuf->in_len,
1671                   rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
1672         strbuf_complete(rules->strbuf);
1673
1674         /* cleanup uid/gid cache */
1675         free(rules->uids);
1676         rules->uids = NULL;
1677         rules->uids_cur = 0;
1678         rules->uids_max = 0;
1679         free(rules->gids);
1680         rules->gids = NULL;
1681         rules->gids_cur = 0;
1682         rules->gids_max = 0;
1683
1684         dump_rules(rules);
1685         return rules;
1686 }
1687
1688 struct udev_rules *udev_rules_unref(struct udev_rules *rules)
1689 {
1690         if (rules == NULL)
1691                 return NULL;
1692         free(rules->tokens);
1693         strbuf_cleanup(rules->strbuf);
1694         free(rules->uids);
1695         free(rules->gids);
1696         strv_free(rules->dirs);
1697         free(rules->dirs_ts_usec);
1698         free(rules);
1699         return NULL;
1700 }
1701
1702 bool udev_rules_check_timestamp(struct udev_rules *rules)
1703 {
1704         unsigned int i;
1705         bool changed = false;
1706
1707         if (rules == NULL)
1708                 goto out;
1709
1710         for (i = 0; rules->dirs[i]; i++) {
1711                 struct stat stats;
1712
1713                 if (stat(rules->dirs[i], &stats) < 0)
1714                         continue;
1715
1716                 if (rules->dirs_ts_usec[i] == timespec_load(&stats.st_mtim))
1717                         continue;
1718
1719                 /* first check */
1720                 if (rules->dirs_ts_usec[i] != 0) {
1721                         log_debug("reload - timestamp of '%s' changed\n", rules->dirs[i]);
1722                         changed = true;
1723                 }
1724
1725                 /* update timestamp */
1726                 rules->dirs_ts_usec[i] = timespec_load(&stats.st_mtim);
1727         }
1728 out:
1729         return changed;
1730 }
1731
1732 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1733 {
1734         char *key_value = rules_str(rules, token->key.value_off);
1735         char *pos;
1736         bool match = false;
1737
1738         if (val == NULL)
1739                 val = "";
1740
1741         switch (token->key.glob) {
1742         case GL_PLAIN:
1743                 match = (streq(key_value, val));
1744                 break;
1745         case GL_GLOB:
1746                 match = (fnmatch(key_value, val, 0) == 0);
1747                 break;
1748         case GL_SPLIT:
1749                 {
1750                         const char *s;
1751                         size_t len;
1752
1753                         s = rules_str(rules, token->key.value_off);
1754                         len = strlen(val);
1755                         for (;;) {
1756                                 const char *next;
1757
1758                                 next = strchr(s, '|');
1759                                 if (next != NULL) {
1760                                         size_t matchlen = (size_t)(next - s);
1761
1762                                         match = (matchlen == len && strneq(s, val, matchlen));
1763                                         if (match)
1764                                                 break;
1765                                 } else {
1766                                         match = (streq(s, val));
1767                                         break;
1768                                 }
1769                                 s = &next[1];
1770                         }
1771                         break;
1772                 }
1773         case GL_SPLIT_GLOB:
1774                 {
1775                         char value[UTIL_PATH_SIZE];
1776
1777                         strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
1778                         key_value = value;
1779                         while (key_value != NULL) {
1780                                 pos = strchr(key_value, '|');
1781                                 if (pos != NULL) {
1782                                         pos[0] = '\0';
1783                                         pos = &pos[1];
1784                                 }
1785                                 match = (fnmatch(key_value, val, 0) == 0);
1786                                 if (match)
1787                                         break;
1788                                 key_value = pos;
1789                         }
1790                         break;
1791                 }
1792         case GL_SOMETHING:
1793                 match = (val[0] != '\0');
1794                 break;
1795         case GL_UNSET:
1796                 return -1;
1797         }
1798
1799         if (match && (token->key.op == OP_MATCH))
1800                 return 0;
1801         if (!match && (token->key.op == OP_NOMATCH))
1802                 return 0;
1803         return -1;
1804 }
1805
1806 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1807 {
1808         const char *name;
1809         char nbuf[UTIL_NAME_SIZE];
1810         const char *value;
1811         char vbuf[UTIL_NAME_SIZE];
1812         size_t len;
1813
1814         name = rules_str(rules, cur->key.attr_off);
1815         switch (cur->key.attrsubst) {
1816         case SB_FORMAT:
1817                 udev_event_apply_format(event, name, nbuf, sizeof(nbuf));
1818                 name = nbuf;
1819                 /* fall through */
1820         case SB_NONE:
1821                 value = udev_device_get_sysattr_value(dev, name);
1822                 if (value == NULL)
1823                         return -1;
1824                 break;
1825         case SB_SUBSYS:
1826                 if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)
1827                         return -1;
1828                 value = vbuf;
1829                 break;
1830         default:
1831                 return -1;
1832         }
1833
1834         /* remove trailing whitespace, if not asked to match for it */
1835         len = strlen(value);
1836         if (len > 0 && isspace(value[len-1])) {
1837                 const char *key_value;
1838                 size_t klen;
1839
1840                 key_value = rules_str(rules, cur->key.value_off);
1841                 klen = strlen(key_value);
1842                 if (klen > 0 && !isspace(key_value[klen-1])) {
1843                         if (value != vbuf) {
1844                                 strscpy(vbuf, sizeof(vbuf), value);
1845                                 value = vbuf;
1846                         }
1847                         while (len > 0 && isspace(vbuf[--len]))
1848                                 vbuf[len] = '\0';
1849                 }
1850         }
1851
1852         return match_key(rules, cur, value);
1853 }
1854
1855 enum escape_type {
1856         ESCAPE_UNSET,
1857         ESCAPE_NONE,
1858         ESCAPE_REPLACE,
1859 };
1860
1861 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
1862 {
1863         struct token *cur;
1864         struct token *rule;
1865         enum escape_type esc = ESCAPE_UNSET;
1866         bool can_set_name;
1867
1868         if (rules->tokens == NULL)
1869                 return -1;
1870
1871         can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
1872                         (major(udev_device_get_devnum(event->dev)) > 0 ||
1873                          udev_device_get_ifindex(event->dev) > 0));
1874
1875         /* loop through token list, match, run actions or forward to next rule */
1876         cur = &rules->tokens[0];
1877         rule = cur;
1878         for (;;) {
1879                 dump_token(rules, cur);
1880                 switch (cur->type) {
1881                 case TK_RULE:
1882                         /* current rule */
1883                         rule = cur;
1884                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1885                         if (!can_set_name && rule->rule.can_set_name)
1886                                 goto nomatch;
1887                         esc = ESCAPE_UNSET;
1888                         break;
1889                 case TK_M_ACTION:
1890                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1891                                 goto nomatch;
1892                         break;
1893                 case TK_M_DEVPATH:
1894                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1895                                 goto nomatch;
1896                         break;
1897                 case TK_M_KERNEL:
1898                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1899                                 goto nomatch;
1900                         break;
1901                 case TK_M_DEVLINK: {
1902                         struct udev_list_entry *list_entry;
1903                         bool match = false;
1904
1905                         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1906                                 const char *devlink;
1907
1908                                 devlink =  udev_list_entry_get_name(list_entry) + strlen("/dev/");
1909                                 if (match_key(rules, cur, devlink) == 0) {
1910                                         match = true;
1911                                         break;
1912                                 }
1913                         }
1914                         if (!match)
1915                                 goto nomatch;
1916                         break;
1917                 }
1918                 case TK_M_NAME:
1919                         if (match_key(rules, cur, event->name) != 0)
1920                                 goto nomatch;
1921                         break;
1922                 case TK_M_ENV: {
1923                         const char *key_name = rules_str(rules, cur->key.attr_off);
1924                         const char *value;
1925
1926                         value = udev_device_get_property_value(event->dev, key_name);
1927                         if (value == NULL)
1928                                 value = "";
1929                         if (match_key(rules, cur, value))
1930                                 goto nomatch;
1931                         break;
1932                 }
1933                 case TK_M_TAG: {
1934                         struct udev_list_entry *list_entry;
1935                         bool match = false;
1936
1937                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {
1938                                 if (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
1939                                         match = true;
1940                                         break;
1941                                 }
1942                         }
1943                         if (!match && (cur->key.op != OP_NOMATCH))
1944                                 goto nomatch;
1945                         break;
1946                 }
1947                 case TK_M_SUBSYSTEM:
1948                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1949                                 goto nomatch;
1950                         break;
1951                 case TK_M_DRIVER:
1952                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1953                                 goto nomatch;
1954                         break;
1955                 case TK_M_WAITFOR: {
1956                         char filename[UTIL_PATH_SIZE];
1957                         int found;
1958
1959                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
1960                         found = (wait_for_file(event->dev, filename, 10) == 0);
1961                         if (!found && (cur->key.op != OP_NOMATCH))
1962                                 goto nomatch;
1963                         break;
1964                 }
1965                 case TK_M_ATTR:
1966                         if (match_attr(rules, event->dev, event, cur) != 0)
1967                                 goto nomatch;
1968                         break;
1969                 case TK_M_KERNELS:
1970                 case TK_M_SUBSYSTEMS:
1971                 case TK_M_DRIVERS:
1972                 case TK_M_ATTRS:
1973                 case TK_M_TAGS: {
1974                         struct token *next;
1975
1976                         /* get whole sequence of parent matches */
1977                         next = cur;
1978                         while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1979                                 next++;
1980
1981                         /* loop over parents */
1982                         event->dev_parent = event->dev;
1983                         for (;;) {
1984                                 struct token *key;
1985
1986                                 /* loop over sequence of parent match keys */
1987                                 for (key = cur; key < next; key++ ) {
1988                                         dump_token(rules, key);
1989                                         switch(key->type) {
1990                                         case TK_M_KERNELS:
1991                                                 if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1992                                                         goto try_parent;
1993                                                 break;
1994                                         case TK_M_SUBSYSTEMS:
1995                                                 if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
1996                                                         goto try_parent;
1997                                                 break;
1998                                         case TK_M_DRIVERS:
1999                                                 if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
2000                                                         goto try_parent;
2001                                                 break;
2002                                         case TK_M_ATTRS:
2003                                                 if (match_attr(rules, event->dev_parent, event, key) != 0)
2004                                                         goto try_parent;
2005                                                 break;
2006                                         case TK_M_TAGS: {
2007                                                 bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
2008
2009                                                 if (match && key->key.op == OP_NOMATCH)
2010                                                         goto try_parent;
2011                                                 if (!match && key->key.op == OP_MATCH)
2012                                                         goto try_parent;
2013                                                 break;
2014                                         }
2015                                         default:
2016                                                 goto nomatch;
2017                                         }
2018                                 }
2019                                 break;
2020
2021                         try_parent:
2022                                 event->dev_parent = udev_device_get_parent(event->dev_parent);
2023                                 if (event->dev_parent == NULL)
2024                                         goto nomatch;
2025                         }
2026                         /* move behind our sequence of parent match keys */
2027                         cur = next;
2028                         continue;
2029                 }
2030                 case TK_M_TEST: {
2031                         char filename[UTIL_PATH_SIZE];
2032                         struct stat statbuf;
2033                         int match;
2034
2035                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), filename, sizeof(filename));
2036                         if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {
2037                                 if (filename[0] != '/') {
2038                                         char tmp[UTIL_PATH_SIZE];
2039
2040                                         strscpy(tmp, sizeof(tmp), filename);
2041                                         strscpyl(filename, sizeof(filename),
2042                                                       udev_device_get_syspath(event->dev), "/", tmp, NULL);
2043                                 }
2044                         }
2045                         attr_subst_subdir(filename, sizeof(filename));
2046
2047                         match = (stat(filename, &statbuf) == 0);
2048                         if (match && cur->key.mode > 0)
2049                                 match = ((statbuf.st_mode & cur->key.mode) > 0);
2050                         if (match && cur->key.op == OP_NOMATCH)
2051                                 goto nomatch;
2052                         if (!match && cur->key.op == OP_MATCH)
2053                                 goto nomatch;
2054                         break;
2055                 }
2056                 case TK_M_EVENT_TIMEOUT:
2057                         log_debug("OPTIONS event_timeout=%u\n", cur->key.event_timeout);
2058                         event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
2059                         break;
2060                 case TK_M_PROGRAM: {
2061                         char program[UTIL_PATH_SIZE];
2062                         char **envp;
2063                         char result[UTIL_PATH_SIZE];
2064
2065                         free(event->program_result);
2066                         event->program_result = NULL;
2067                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program));
2068                         envp = udev_device_get_properties_envp(event->dev);
2069                         log_debug("PROGRAM '%s' %s:%u\n",
2070                                   program,
2071                                   rules_str(rules, rule->rule.filename_off),
2072                                   rule->rule.filename_line);
2073
2074                         if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
2075                                 if (cur->key.op != OP_NOMATCH)
2076                                         goto nomatch;
2077                         } else {
2078                                 int count;
2079
2080                                 util_remove_trailing_chars(result, '\n');
2081                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2082                                         count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
2083                                         if (count > 0)
2084                                                 log_debug("%i character(s) replaced\n" , count);
2085                                 }
2086                                 event->program_result = strdup(result);
2087                                 if (cur->key.op == OP_NOMATCH)
2088                                         goto nomatch;
2089                         }
2090                         break;
2091                 }
2092                 case TK_M_IMPORT_FILE: {
2093                         char import[UTIL_PATH_SIZE];
2094
2095                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2096                         if (import_file_into_properties(event->dev, import) != 0)
2097                                 if (cur->key.op != OP_NOMATCH)
2098                                         goto nomatch;
2099                         break;
2100                 }
2101                 case TK_M_IMPORT_PROG: {
2102                         char import[UTIL_PATH_SIZE];
2103
2104                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2105                         log_debug("IMPORT '%s' %s:%u\n",
2106                                   import,
2107                                   rules_str(rules, rule->rule.filename_off),
2108                                   rule->rule.filename_line);
2109
2110                         if (import_program_into_properties(event, import, sigmask) != 0)
2111                                 if (cur->key.op != OP_NOMATCH)
2112                                         goto nomatch;
2113                         break;
2114                 }
2115                 case TK_M_IMPORT_BUILTIN: {
2116                         char command[UTIL_PATH_SIZE];
2117
2118                         if (udev_builtin_run_once(cur->key.builtin_cmd)) {
2119                                 /* check if we ran already */
2120                                 if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
2121                                         log_debug("IMPORT builtin skip '%s' %s:%u\n",
2122                                                   udev_builtin_name(cur->key.builtin_cmd),
2123                                                   rules_str(rules, rule->rule.filename_off),
2124                                                   rule->rule.filename_line);
2125                                         /* return the result from earlier run */
2126                                         if (event->builtin_ret & (1 << cur->key.builtin_cmd))
2127                                         if (cur->key.op != OP_NOMATCH)
2128                                                         goto nomatch;
2129                                         break;
2130                                 }
2131                                 /* mark as ran */
2132                                 event->builtin_run |= (1 << cur->key.builtin_cmd);
2133                         }
2134
2135                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command));
2136                         log_debug("IMPORT builtin '%s' %s:%u\n",
2137                                   udev_builtin_name(cur->key.builtin_cmd),
2138                                   rules_str(rules, rule->rule.filename_off),
2139                                   rule->rule.filename_line);
2140
2141                         if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
2142                                 /* remember failure */
2143                                 log_debug("IMPORT builtin '%s' returned non-zero\n",
2144                                           udev_builtin_name(cur->key.builtin_cmd));
2145                                 event->builtin_ret |= (1 << cur->key.builtin_cmd);
2146                                 if (cur->key.op != OP_NOMATCH)
2147                                         goto nomatch;
2148                         }
2149                         break;
2150                 }
2151                 case TK_M_IMPORT_DB: {
2152                         const char *key = rules_str(rules, cur->key.value_off);
2153                         const char *value;
2154
2155                         value = udev_device_get_property_value(event->dev_db, key);
2156                         if (value != NULL) {
2157                                 struct udev_list_entry *entry;
2158
2159                                 entry = udev_device_add_property(event->dev, key, value);
2160                                 udev_list_entry_set_num(entry, true);
2161                         } else {
2162                                 if (cur->key.op != OP_NOMATCH)
2163                                         goto nomatch;
2164                         }
2165                         break;
2166                 }
2167                 case TK_M_IMPORT_CMDLINE: {
2168                         FILE *f;
2169                         bool imported = false;
2170
2171                         f = fopen("/proc/cmdline", "re");
2172                         if (f != NULL) {
2173                                 char cmdline[4096];
2174
2175                                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
2176                                         const char *key = rules_str(rules, cur->key.value_off);
2177                                         char *pos;
2178
2179                                         pos = strstr(cmdline, key);
2180                                         if (pos != NULL) {
2181                                                 struct udev_list_entry *entry;
2182
2183                                                 pos += strlen(key);
2184                                                 if (pos[0] == '\0' || isspace(pos[0])) {
2185                                                         /* we import simple flags as 'FLAG=1' */
2186                                                         entry = udev_device_add_property(event->dev, key, "1");
2187                                                         udev_list_entry_set_num(entry, true);
2188                                                         imported = true;
2189                                                 } else if (pos[0] == '=') {
2190                                                         const char *value;
2191
2192                                                         pos++;
2193                                                         value = pos;
2194                                                         while (pos[0] != '\0' && !isspace(pos[0]))
2195                                                                 pos++;
2196                                                         pos[0] = '\0';
2197                                                         entry = udev_device_add_property(event->dev, key, value);
2198                                                         udev_list_entry_set_num(entry, true);
2199                                                         imported = true;
2200                                                 }
2201                                         }
2202                                 }
2203                                 fclose(f);
2204                         }
2205                         if (!imported && cur->key.op != OP_NOMATCH)
2206                                 goto nomatch;
2207                         break;
2208                 }
2209                 case TK_M_IMPORT_PARENT: {
2210                         char import[UTIL_PATH_SIZE];
2211
2212                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import));
2213                         if (import_parent_into_properties(event->dev, import) != 0)
2214                                 if (cur->key.op != OP_NOMATCH)
2215                                         goto nomatch;
2216                         break;
2217                 }
2218                 case TK_M_RESULT:
2219                         if (match_key(rules, cur, event->program_result) != 0)
2220                                 goto nomatch;
2221                         break;
2222                 case TK_A_STRING_ESCAPE_NONE:
2223                         esc = ESCAPE_NONE;
2224                         break;
2225                 case TK_A_STRING_ESCAPE_REPLACE:
2226                         esc = ESCAPE_REPLACE;
2227                         break;
2228                 case TK_A_DB_PERSIST:
2229                         udev_device_set_db_persist(event->dev);
2230                         break;
2231                 case TK_A_INOTIFY_WATCH:
2232                         if (event->inotify_watch_final)
2233                                 break;
2234                         if (cur->key.op == OP_ASSIGN_FINAL)
2235                                 event->inotify_watch_final = true;
2236                         event->inotify_watch = cur->key.watch;
2237                         break;
2238                 case TK_A_DEVLINK_PRIO:
2239                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2240                         break;
2241                 case TK_A_OWNER: {
2242                         char owner[UTIL_NAME_SIZE];
2243
2244                         if (event->owner_final)
2245                                 break;
2246                         if (cur->key.op == OP_ASSIGN_FINAL)
2247                                 event->owner_final = true;
2248                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner));
2249                         event->owner_set = true;
2250                         event->uid = util_lookup_user(event->udev, owner);
2251                         log_debug("OWNER %u %s:%u\n",
2252                                   event->uid,
2253                                   rules_str(rules, rule->rule.filename_off),
2254                                   rule->rule.filename_line);
2255                         break;
2256                 }
2257                 case TK_A_GROUP: {
2258                         char group[UTIL_NAME_SIZE];
2259
2260                         if (event->group_final)
2261                                 break;
2262                         if (cur->key.op == OP_ASSIGN_FINAL)
2263                                 event->group_final = true;
2264                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group));
2265                         event->group_set = true;
2266                         event->gid = util_lookup_group(event->udev, group);
2267                         log_debug("GROUP %u %s:%u\n",
2268                                   event->gid,
2269                                   rules_str(rules, rule->rule.filename_off),
2270                                   rule->rule.filename_line);
2271                         break;
2272                 }
2273                 case TK_A_MODE: {
2274                         char mode_str[UTIL_NAME_SIZE];
2275                         mode_t mode;
2276                         char *endptr;
2277
2278                         if (event->mode_final)
2279                                 break;
2280                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str));
2281                         mode = strtol(mode_str, &endptr, 8);
2282                         if (endptr[0] != '\0') {
2283                                 log_error("ignoring invalid mode '%s'\n", mode_str);
2284                                 break;
2285                         }
2286                         if (cur->key.op == OP_ASSIGN_FINAL)
2287                                 event->mode_final = true;
2288                         event->mode_set = true;
2289                         event->mode = mode;
2290                         log_debug("MODE %#o %s:%u\n",
2291                                   event->mode,
2292                                   rules_str(rules, rule->rule.filename_off),
2293                                   rule->rule.filename_line);
2294                         break;
2295                 }
2296                 case TK_A_OWNER_ID:
2297                         if (event->owner_final)
2298                                 break;
2299                         if (cur->key.op == OP_ASSIGN_FINAL)
2300                                 event->owner_final = true;
2301                         event->owner_set = true;
2302                         event->uid = cur->key.uid;
2303                         log_debug("OWNER %u %s:%u\n",
2304                                   event->uid,
2305                                   rules_str(rules, rule->rule.filename_off),
2306                                   rule->rule.filename_line);
2307                         break;
2308                 case TK_A_GROUP_ID:
2309                         if (event->group_final)
2310                                 break;
2311                         if (cur->key.op == OP_ASSIGN_FINAL)
2312                                 event->group_final = true;
2313                         event->group_set = true;
2314                         event->gid = cur->key.gid;
2315                         log_debug("GROUP %u %s:%u\n",
2316                                   event->gid,
2317                                   rules_str(rules, rule->rule.filename_off),
2318                                   rule->rule.filename_line);
2319                         break;
2320                 case TK_A_MODE_ID:
2321                         if (event->mode_final)
2322                                 break;
2323                         if (cur->key.op == OP_ASSIGN_FINAL)
2324                                 event->mode_final = true;
2325                         event->mode_set = true;
2326                         event->mode = cur->key.mode;
2327                         log_debug("MODE %#o %s:%u\n",
2328                                   event->mode,
2329                                   rules_str(rules, rule->rule.filename_off),
2330                                   rule->rule.filename_line);
2331                         break;
2332                 case TK_A_ENV: {
2333                         const char *name = rules_str(rules, cur->key.attr_off);
2334                         char *value = rules_str(rules, cur->key.value_off);
2335                         char value_new[UTIL_NAME_SIZE];
2336                         const char *value_old = NULL;
2337                         struct udev_list_entry *entry;
2338
2339                         if (value[0] == '\0') {
2340                                 if (cur->key.op == OP_ADD)
2341                                         break;
2342                                 udev_device_add_property(event->dev, name, NULL);
2343                                 break;
2344                         }
2345
2346                         if (cur->key.op == OP_ADD)
2347                                 value_old = udev_device_get_property_value(event->dev, name);
2348                         if (value_old) {
2349                                 char temp[UTIL_NAME_SIZE];
2350
2351                                 /* append value separated by space */
2352                                 udev_event_apply_format(event, value, temp, sizeof(temp));
2353                                 strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
2354                         } else
2355                                 udev_event_apply_format(event, value, value_new, sizeof(value_new));
2356
2357                         entry = udev_device_add_property(event->dev, name, value_new);
2358                         /* store in db, skip private keys */
2359                         if (name[0] != '.')
2360                                 udev_list_entry_set_num(entry, true);
2361                         break;
2362                 }
2363                 case TK_A_TAG: {
2364                         char tag[UTIL_PATH_SIZE];
2365                         const char *p;
2366
2367                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag));
2368                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2369                                 udev_device_cleanup_tags_list(event->dev);
2370                         for (p = tag; *p != '\0'; p++) {
2371                                 if ((*p >= 'a' && *p <= 'z') ||
2372                                     (*p >= 'A' && *p <= 'Z') ||
2373                                     (*p >= '0' && *p <= '9') ||
2374                                     *p == '-' || *p == '_')
2375                                         continue;
2376                                 log_error("ignoring invalid tag name '%s'\n", tag);
2377                                 break;
2378                         }
2379                         udev_device_add_tag(event->dev, tag);
2380                         break;
2381                 }
2382                 case TK_A_NAME: {
2383                         const char *name  = rules_str(rules, cur->key.value_off);
2384
2385                         char name_str[UTIL_PATH_SIZE];
2386                         int count;
2387
2388                         if (event->name_final)
2389                                 break;
2390                         if (cur->key.op == OP_ASSIGN_FINAL)
2391                                 event->name_final = true;
2392                         udev_event_apply_format(event, name, name_str, sizeof(name_str));
2393                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2394                                 count = util_replace_chars(name_str, "/");
2395                                 if (count > 0)
2396                                         log_debug("%i character(s) replaced\n", count);
2397                         }
2398                         if (major(udev_device_get_devnum(event->dev)) &&
2399                             (!streq(name_str, udev_device_get_devnode(event->dev) + strlen("/dev/")))) {
2400                                 log_error("NAME=\"%s\" ignored, kernel device nodes "
2401                                     "can not be renamed; please fix it in %s:%u\n", name,
2402                                     rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2403                                 break;
2404                         }
2405                         free(event->name);
2406                         event->name = strdup(name_str);
2407                         log_debug("NAME '%s' %s:%u\n",
2408                                   event->name,
2409                                   rules_str(rules, rule->rule.filename_off),
2410                                   rule->rule.filename_line);
2411                         break;
2412                 }
2413                 case TK_A_DEVLINK: {
2414                         char temp[UTIL_PATH_SIZE];
2415                         char filename[UTIL_PATH_SIZE];
2416                         char *pos, *next;
2417                         int count = 0;
2418
2419                         if (event->devlink_final)
2420                                 break;
2421                         if (major(udev_device_get_devnum(event->dev)) == 0)
2422                                 break;
2423                         if (cur->key.op == OP_ASSIGN_FINAL)
2424                                 event->devlink_final = true;
2425                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2426                                 udev_device_cleanup_devlinks_list(event->dev);
2427
2428                         /* allow  multiple symlinks separated by spaces */
2429                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp));
2430                         if (esc == ESCAPE_UNSET)
2431                                 count = util_replace_chars(temp, "/ ");
2432                         else if (esc == ESCAPE_REPLACE)
2433                                 count = util_replace_chars(temp, "/");
2434                         if (count > 0)
2435                                 log_debug("%i character(s) replaced\n" , count);
2436                         pos = temp;
2437                         while (isspace(pos[0]))
2438                                 pos++;
2439                         next = strchr(pos, ' ');
2440                         while (next != NULL) {
2441                                 next[0] = '\0';
2442                                 log_debug("LINK '%s' %s:%u\n", pos,
2443                                           rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2444                                 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2445                                 udev_device_add_devlink(event->dev, filename);
2446                                 while (isspace(next[1]))
2447                                         next++;
2448                                 pos = &next[1];
2449                                 next = strchr(pos, ' ');
2450                         }
2451                         if (pos[0] != '\0') {
2452                                 log_debug("LINK '%s' %s:%u\n", pos,
2453                                           rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
2454                                 strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
2455                                 udev_device_add_devlink(event->dev, filename);
2456                         }
2457                         break;
2458                 }
2459                 case TK_A_ATTR: {
2460                         const char *key_name = rules_str(rules, cur->key.attr_off);
2461                         char attr[UTIL_PATH_SIZE];
2462                         char value[UTIL_NAME_SIZE];
2463                         FILE *f;
2464
2465                         if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0)
2466                                 strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
2467                         attr_subst_subdir(attr, sizeof(attr));
2468
2469                         udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
2470                         log_debug("ATTR '%s' writing '%s' %s:%u\n", attr, value,
2471                                   rules_str(rules, rule->rule.filename_off),
2472                                   rule->rule.filename_line);
2473                         f = fopen(attr, "we");
2474                         if (f != NULL) {
2475                                 if (fprintf(f, "%s", value) <= 0)
2476                                         log_error("error writing ATTR{%s}: %m\n", attr);
2477                                 fclose(f);
2478                         } else {
2479                                 log_error("error opening ATTR{%s} for writing: %m\n", attr);
2480                         }
2481                         break;
2482                 }
2483                 case TK_A_RUN_BUILTIN:
2484                 case TK_A_RUN_PROGRAM: {
2485                         struct udev_list_entry *entry;
2486
2487                         if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2488                                 udev_list_cleanup(&event->run_list);
2489                         log_debug("RUN '%s' %s:%u\n",
2490                                   rules_str(rules, cur->key.value_off),
2491                                   rules_str(rules, rule->rule.filename_off),
2492                                   rule->rule.filename_line);
2493                         entry = udev_list_entry_add(&event->run_list, rules_str(rules, cur->key.value_off), NULL);
2494                         udev_list_entry_set_num(entry, cur->key.builtin_cmd);
2495                         break;
2496                 }
2497                 case TK_A_GOTO:
2498                         if (cur->key.rule_goto == 0)
2499                                 break;
2500                         cur = &rules->tokens[cur->key.rule_goto];
2501                         continue;
2502                 case TK_END:
2503                         return 0;
2504
2505                 case TK_M_PARENTS_MIN:
2506                 case TK_M_PARENTS_MAX:
2507                 case TK_M_MAX:
2508                 case TK_UNSET:
2509                         log_error("wrong type %u\n", cur->type);
2510                         goto nomatch;
2511                 }
2512
2513                 cur++;
2514                 continue;
2515         nomatch:
2516                 /* fast-forward to next rule */
2517                 cur = rule + rule->rule.token_count;
2518         }
2519 }
2520
2521 int udev_rules_apply_static_dev_perms(struct udev_rules *rules)
2522 {
2523         struct token *cur;
2524         struct token *rule;
2525         uid_t uid = 0;
2526         gid_t gid = 0;
2527         mode_t mode = 0;
2528         _cleanup_strv_free_ char **tags = NULL;
2529         char **t;
2530         FILE *f = NULL;
2531         _cleanup_free_ char *path = NULL;
2532         int r = 0;
2533
2534         if (rules->tokens == NULL)
2535                 return 0;
2536
2537         cur = &rules->tokens[0];
2538         rule = cur;
2539         for (;;) {
2540                 switch (cur->type) {
2541                 case TK_RULE:
2542                         /* current rule */
2543                         rule = cur;
2544
2545                         /* skip rules without a static_node tag */
2546                         if (!rule->rule.has_static_node)
2547                                 goto next;
2548
2549                         uid = 0;
2550                         gid = 0;
2551                         mode = 0;
2552                         strv_free(tags);
2553                         tags = NULL;
2554                         break;
2555                 case TK_A_OWNER_ID:
2556                         uid = cur->key.uid;
2557                         break;
2558                 case TK_A_GROUP_ID:
2559                         gid = cur->key.gid;
2560                         break;
2561                 case TK_A_MODE_ID:
2562                         mode = cur->key.mode;
2563                         break;
2564                 case TK_A_TAG:
2565                         r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
2566                         if (r < 0)
2567                                 goto finish;
2568
2569                         break;
2570                 case TK_A_STATIC_NODE: {
2571                         char device_node[UTIL_PATH_SIZE];
2572                         char tags_dir[UTIL_PATH_SIZE];
2573                         char tag_symlink[UTIL_PATH_SIZE];
2574                         struct stat stats;
2575
2576                         /* we assure, that the permissions tokens are sorted before the static token */
2577                         if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
2578                                 goto next;
2579                         strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
2580                         if (stat(device_node, &stats) != 0)
2581                                 goto next;
2582                         if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
2583                                 goto next;
2584
2585                         if (tags) {
2586                                 /* Export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
2587
2588                                 STRV_FOREACH(t, tags) {
2589                                         _cleanup_free_ char *unescaped_filename = NULL;
2590
2591                                         strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
2592                                         r = mkdir_p(tags_dir, 0755);
2593                                         if (r < 0) {
2594                                                 log_error("failed to create %s: %s\n", tags_dir, strerror(-r));
2595                                                 return r;
2596                                         }
2597
2598                                         unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
2599
2600                                         strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
2601                                         r = symlink(device_node, tag_symlink);
2602                                         if (r < 0 && errno != EEXIST) {
2603                                                 log_error("failed to create symlink %s -> %s: %s\n", tag_symlink, device_node, strerror(errno));
2604                                                 return -errno;
2605                                         } else
2606                                                 r = 0;
2607                                 }
2608                         }
2609
2610                         /* don't touch the permissions if only the tags were set */
2611                         if (mode == 0 && uid == 0 && gid == 0)
2612                                 goto next;
2613
2614                         if (mode == 0) {
2615                                 if (gid > 0)
2616                                         mode = 0660;
2617                                 else
2618                                         mode = 0600;
2619                         }
2620                         if (mode != (stats.st_mode & 01777)) {
2621                                 r = chmod(device_node, mode);
2622                                 if (r < 0) {
2623                                         log_error("failed to chmod '%s' %#o\n", device_node, mode);
2624                                         return -errno;
2625                                 } else
2626                                         log_debug("chmod '%s' %#o\n", device_node, mode);
2627                         }
2628
2629                         if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
2630                                 r = chown(device_node, uid, gid);
2631                                 if (r < 0) {
2632                                         log_error("failed to chown '%s' %u %u \n", device_node, uid, gid);
2633                                         return -errno;
2634                                 } else
2635                                         log_debug("chown '%s' %u %u\n", device_node, uid, gid);
2636                         }
2637
2638                         utimensat(AT_FDCWD, device_node, NULL, 0);
2639                         break;
2640                 }
2641                 case TK_END:
2642                         goto finish;
2643                 }
2644
2645                 cur++;
2646                 continue;
2647 next:
2648                 /* fast-forward to next rule */
2649                 cur = rule + rule->rule.token_count;
2650                 continue;
2651         }
2652
2653 finish:
2654         if (f) {
2655                 fflush(f);
2656                 fchmod(fileno(f), 0644);
2657                 if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
2658                         r = -errno;
2659                         unlink("/run/udev/static_node-tags");
2660                         unlink(path);
2661                 }
2662                 fclose(f);
2663         }
2664
2665         return r;
2666 }