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