udev/udev-rules.c

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