udev/udev-rules.c

   1 /*
   2  * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stddef.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <fcntl.h>
  23 #include <ctype.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <dirent.h>
  27 #include <fnmatch.h>
  28
  29 #include "udev.h"
  30
  31 #define PREALLOC_TOKEN                  2048
  32 #define PREALLOC_STRBUF                 32 * 1024
  33
  34 /* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
  35 enum operation_type {
  36         OP_UNSET,
  37
  38         OP_MATCH,
  39         OP_NOMATCH,
  40         OP_MATCH_MAX,
  41
  42         OP_ADD,
  43         OP_ASSIGN,
  44         OP_ASSIGN_FINAL,
  45 };
  46
  47 static const char *operation_str[] = {
  48         [OP_UNSET] =            "UNSET",
  49         [OP_MATCH] =            "match",
  50         [OP_NOMATCH] =          "nomatch",
  51         [OP_MATCH_MAX] =        "MATCH_MAX",
  52
  53         [OP_ADD] =              "add",
  54         [OP_ASSIGN] =           "assign",
  55         [OP_ASSIGN_FINAL] =     "assign-final",
  56 };
  57
  58 enum string_glob_type {
  59         GL_UNSET,
  60         GL_PLAIN,                       /* no special chars */
  61         GL_GLOB,                        /* shell globs ?,*,[] */
  62         GL_SPLIT,                       /* multi-value A|B */
  63         GL_SPLIT_GLOB,                  /* multi-value with glob A*|B* */
  64         GL_SOMETHING,                   /* commonly used "?*" */
  65         GL_FORMAT,
  66 };
  67
  68 #ifdef DEBUG
  69 static const char *string_glob_str[] = {
  70         [GL_UNSET] =            "UNSET",
  71         [GL_PLAIN] =            "plain",
  72         [GL_GLOB] =             "glob",
  73         [GL_SPLIT] =            "split",
  74         [GL_SPLIT_GLOB] =       "split-glob",
  75         [GL_SOMETHING] =        "split-glob",
  76         [GL_FORMAT] =           "format",
  77 };
  78 #endif
  79
  80 /* tokens of a rule are sorted/handled in this order */
  81 enum token_type {
  82         TK_UNSET,
  83         TK_RULE,
  84
  85         TK_M_ACTION,                    /* val */
  86         TK_M_DEVPATH,                   /* val */
  87         TK_M_KERNEL,                    /* val */
  88         TK_M_DEVLINK,                   /* val */
  89         TK_M_NAME,                      /* val */
  90         TK_M_ENV,                       /* val, attr */
  91         TK_M_SUBSYSTEM,                 /* val */
  92         TK_M_DRIVER,                    /* val */
  93         TK_M_WAITFOR,                   /* val */
  94         TK_M_ATTR,                      /* val, attr */
  95
  96         TK_M_PARENTS_MIN,
  97         TK_M_KERNELS,                   /* val */
  98         TK_M_SUBSYSTEMS,                /* val */
  99         TK_M_DRIVERS,                   /* val */
 100         TK_M_ATTRS,                     /* val, attr */
 101         TK_M_PARENTS_MAX,
 102
 103         TK_M_TEST,                      /* val, mode_t */
 104         TK_M_PROGRAM,                   /* val */
 105         TK_M_IMPORT_FILE,               /* val */
 106         TK_M_IMPORT_PROG,               /* val */
 107         TK_M_IMPORT_PARENT,             /* val */
 108         TK_M_RESULT,                    /* val */
 109         TK_M_MAX,
 110
 111         TK_A_IGNORE_DEVICE,
 112         TK_A_STRING_ESCAPE_NONE,
 113         TK_A_STRING_ESCAPE_REPLACE,
 114         TK_A_NUM_FAKE_PART,             /* int */
 115         TK_A_DEVLINK_PRIO,              /* int */
 116         TK_A_OWNER,                     /* val */
 117         TK_A_GROUP,                     /* val */
 118         TK_A_MODE,                      /* val */
 119         TK_A_OWNER_ID,                  /* uid_t */
 120         TK_A_GROUP_ID,                  /* gid_t */
 121         TK_A_MODE_ID,                   /* mode_t */
 122         TK_A_ENV,                       /* val, attr */
 123         TK_A_NAME,                      /* val */
 124         TK_A_DEVLINK,                   /* val */
 125         TK_A_EVENT_TIMEOUT,             /* int */
 126         TK_A_IGNORE_REMOVE,
 127         TK_A_ATTR,                      /* val, attr */
 128         TK_A_RUN,                       /* val, bool */
 129         TK_A_GOTO,                      /* size_t */
 130         TK_A_LAST_RULE,
 131
 132         TK_END,
 133 };
 134
 135 static const char *token_str[] = {
 136         [TK_UNSET] =                    "UNSET",
 137         [TK_RULE] =                     "RULE",
 138
 139         [TK_M_ACTION] =                 "M ACTION",
 140         [TK_M_DEVPATH] =                "M DEVPATH",
 141         [TK_M_KERNEL] =                 "M KERNEL",
 142         [TK_M_DEVLINK] =                "M DEVLINK",
 143         [TK_M_NAME] =                   "M NAME",
 144         [TK_M_ENV] =                    "M ENV",
 145         [TK_M_SUBSYSTEM] =              "M SUBSYSTEM",
 146         [TK_M_DRIVER] =                 "M DRIVER",
 147         [TK_M_WAITFOR] =                "M WAITFOR",
 148         [TK_M_ATTR] =                   "M ATTR",
 149
 150         [TK_M_PARENTS_MIN] =        "M PARENTS_MIN",
 151         [TK_M_KERNELS] =                "M KERNELS",
 152         [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
 153         [TK_M_DRIVERS] =                "M DRIVERS",
 154         [TK_M_ATTRS] =                  "M ATTRS",
 155         [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 156
 157         [TK_M_TEST] =                   "M TEST",
 158         [TK_M_PROGRAM] =                "M PROGRAM",
 159         [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
 160         [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
 161         [TK_M_IMPORT_PARENT] =          "M MPORT_PARENT",
 162         [TK_M_RESULT] =                 "M RESULT",
 163         [TK_M_MAX] =                    "M MAX",
 164
 165         [TK_A_IGNORE_DEVICE] =          "A IGNORE_DEVICE",
 166         [TK_A_STRING_ESCAPE_NONE] =     "A STRING_ESCAPE_NONE",
 167         [TK_A_STRING_ESCAPE_REPLACE] =  "A STRING_ESCAPE_REPLACE",
 168         [TK_A_NUM_FAKE_PART] =          "A NUM_FAKE_PART",
 169         [TK_A_DEVLINK_PRIO] =           "A DEVLINK_PRIO",
 170         [TK_A_OWNER] =                  "A OWNER",
 171         [TK_A_GROUP] =                  "A GROUP",
 172         [TK_A_MODE] =                   "A MODE",
 173         [TK_A_OWNER_ID] =               "A OWNER_ID",
 174         [TK_A_GROUP_ID] =               "A GROUP_ID",
 175         [TK_A_MODE_ID] =                "A MODE_ID",
 176         [TK_A_ENV] =                    "A ENV",
 177         [TK_A_NAME] =                   "A NAME",
 178         [TK_A_DEVLINK] =                "A DEVLINK",
 179         [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
 180         [TK_A_IGNORE_REMOVE] =          "A IGNORE_REMOVE",
 181         [TK_A_ATTR] =                   "A ATTR",
 182         [TK_A_RUN] =                    "A RUN",
 183         [TK_A_GOTO] =                   "A GOTO",
 184         [TK_A_LAST_RULE] =              "A LAST_RULE",
 185
 186         [TK_END] =                      "END",
 187 };
 188
 189 /* we try to pack stuff in a way that we take only 16 bytes per token */
 190 struct token {
 191         union {
 192                 unsigned short type;            /* same as in rule and key */
 193                 struct {
 194                         unsigned short type;
 195                         unsigned short flags;
 196                         unsigned int next_rule;
 197                         unsigned int label_off;
 198                         unsigned short filename_off;
 199                         unsigned short filename_line;
 200                 } rule;
 201                 struct {
 202                         unsigned short type;
 203                         unsigned short flags;
 204                         unsigned short op;
 205                         unsigned short glob;
 206                         unsigned int value_off;
 207                         union {
 208                                 unsigned int attr_off;
 209                                 int ignore_error;
 210                                 int i;
 211                                 unsigned int rule_goto;
 212                                 mode_t  mode;
 213                                 uid_t uid;
 214                                 gid_t gid;
 215                                 int num_fake_part;
 216                                 int devlink_prio;
 217                                 int event_timeout;
 218                         };
 219                 } key;
 220         };
 221 };
 222
 223 #define MAX_TK          64
 224 struct rule_tmp {
 225         struct udev_rules *rules;
 226         struct token rule;
 227         struct token token[MAX_TK];
 228         unsigned int token_cur;
 229 };
 230
 231 struct uid_gid {
 232         unsigned int name_off;
 233         union {
 234                 uid_t   uid;
 235                 gid_t   gid;
 236         };
 237 };
 238
 239 struct udev_rules {
 240         struct udev *udev;
 241         int resolve_names;
 242
 243         /* every key in the rules file becomes a token */
 244         struct token *tokens;
 245         unsigned int token_cur;
 246         unsigned int token_max;
 247
 248         /* all key strings are copied to a single string buffer */
 249         char *buf;
 250         size_t buf_cur;
 251         size_t buf_max;
 252         unsigned int buf_count;
 253
 254         /* during rule parsing, we cache uid/gid lookup results */
 255         struct uid_gid *uids;
 256         unsigned int uids_cur;
 257         unsigned int uids_max;
 258         struct uid_gid *gids;
 259         unsigned int gids_cur;
 260         unsigned int gids_max;
 261 };
 262
 263 /* we could lookup and return existing strings, or tails of strings */
 264 static int add_string(struct udev_rules *rules, const char *str)
 265 {
 266         size_t len = strlen(str)+1;
 267         int off;
 268
 269         /* offset 0 is always '\0' */
 270         if (str[0] == '\0')
 271                 return 0;
 272
 273         /* grow buffer if needed */
 274         if (rules->buf_cur + len+1 >= rules->buf_max) {
 275                 char *buf;
 276                 unsigned int add;
 277
 278                 /* double the buffer size */
 279                 add = rules->buf_max;
 280                 if (add < len * 8)
 281                         add = len * 8;
 282
 283                 buf = realloc(rules->buf, rules->buf_max + add);
 284                 if (buf == NULL)
 285                         return -1;
 286                 dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);
 287                 rules->buf = buf;
 288                 rules->buf_max += add;
 289         }
 290         off = rules->buf_cur;
 291         memcpy(&rules->buf[rules->buf_cur], str, len);
 292         rules->buf_cur += len;
 293         rules->buf_count++;
 294         return off;
 295 }
 296
 297 static int add_token(struct udev_rules *rules, struct token *token)
 298 {
 299
 300         /* grow buffer if needed */
 301         if (rules->token_cur+1 >= rules->token_max) {
 302                 struct token *tokens;
 303                 unsigned int add;
 304
 305                 /* double the buffer size */
 306                 add = rules->token_max;
 307                 if (add < 8)
 308                         add = 8;
 309
 310                 tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
 311                 if (tokens == NULL)
 312                         return -1;
 313                 dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);
 314                 rules->tokens = tokens;
 315                 rules->token_max += add;
 316         }
 317         memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
 318         rules->token_cur++;
 319         return 0;
 320 }
 321
 322 static uid_t add_uid(struct udev_rules *rules, const char *owner)
 323 {
 324         unsigned int i;
 325         uid_t uid;
 326         unsigned int off;
 327
 328         /* lookup, if we know it already */
 329         for (i = 0; i < rules->uids_cur; i++) {
 330                 off = rules->uids[i].name_off;
 331                 if (strcmp(&rules->buf[off], owner) == 0) {
 332                         uid = rules->uids[i].uid;
 333                         dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
 334                         return uid;
 335                 }
 336         }
 337         uid = util_lookup_user(rules->udev, owner);
 338
 339         /* grow buffer if needed */
 340         if (rules->uids_cur+1 >= rules->uids_max) {
 341                 struct uid_gid *uids;
 342                 unsigned int add;
 343
 344                 /* double the buffer size */
 345                 add = rules->uids_max;
 346                 if (add < 1)
 347                         add = 8;
 348
 349                 uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
 350                 if (uids == NULL)
 351                         return uid;
 352                 dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
 353                 rules->uids = uids;
 354                 rules->uids_max += add;
 355         }
 356         rules->uids[rules->uids_cur].uid = uid;
 357         off = add_string(rules, owner);
 358         if (off <= 0)
 359                 return uid;
 360         rules->uids[rules->uids_cur].name_off = off;
 361         rules->uids_cur++;
 362         return uid;
 363 }
 364
 365 static gid_t add_gid(struct udev_rules *rules, const char *group)
 366 {
 367         unsigned int i;
 368         gid_t gid;
 369         unsigned int off;
 370
 371         /* lookup, if we know it already */
 372         for (i = 0; i < rules->gids_cur; i++) {
 373                 off = rules->gids[i].name_off;
 374                 if (strcmp(&rules->buf[off], group) == 0) {
 375                         gid = rules->gids[i].gid;
 376                         dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
 377                         return gid;
 378                 }
 379         }
 380         gid = util_lookup_group(rules->udev, group);
 381
 382         /* grow buffer if needed */
 383         if (rules->gids_cur+1 >= rules->gids_max) {
 384                 struct uid_gid *gids;
 385                 unsigned int add;
 386
 387                 /* double the buffer size */
 388                 add = rules->gids_max;
 389                 if (add < 1)
 390                         add = 8;
 391
 392                 gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
 393                 if (gids == NULL)
 394                         return gid;
 395                 dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
 396                 rules->gids = gids;
 397                 rules->gids_max += add;
 398         }
 399         rules->gids[rules->gids_cur].gid = gid;
 400         off = add_string(rules, group);
 401         if (off <= 0)
 402                 return gid;
 403         rules->gids[rules->gids_cur].name_off = off;
 404         rules->gids_cur++;
 405         return gid;
 406 }
 407
 408 static int import_property_from_string(struct udev_device *dev, char *line)
 409 {
 410         struct udev *udev = udev_device_get_udev(dev);
 411         char *key;
 412         char *val;
 413         size_t len;
 414
 415         /* find key */
 416         key = line;
 417         while (isspace(key[0]))
 418                 key++;
 419
 420         /* comment or empty line */
 421         if (key[0] == '#' || key[0] == '\0')
 422                 return -1;
 423
 424         /* split key/value */
 425         val = strchr(key, '=');
 426         if (val == NULL)
 427                 return -1;
 428         val[0] = '\0';
 429         val++;
 430
 431         /* find value */
 432         while (isspace(val[0]))
 433                 val++;
 434
 435         /* terminate key */
 436         len = strlen(key);
 437         if (len == 0)
 438                 return -1;
 439         while (isspace(key[len-1]))
 440                 len--;
 441         key[len] = '\0';
 442
 443         /* terminate value */
 444         len = strlen(val);
 445         if (len == 0)
 446                 return -1;
 447         while (isspace(val[len-1]))
 448                 len--;
 449         val[len] = '\0';
 450
 451         if (len == 0)
 452                 return -1;
 453
 454         /* unquote */
 455         if (val[0] == '"' || val[0] == '\'') {
 456                 if (val[len-1] != val[0]) {
 457                         info(udev, "inconsistent quoting: '%s', skip\n", line);
 458                         return -1;
 459                 }
 460                 val[len-1] = '\0';
 461                 val++;
 462         }
 463
 464         dbg(udev, "adding '%s'='%s'\n", key, val);
 465
 466         /* handle device, renamed by external tool, returning new path */
 467         if (strcmp(key, "DEVPATH") == 0) {
 468                 char syspath[UTIL_PATH_SIZE];
 469
 470                 info(udev, "updating devpath from '%s' to '%s'\n",
 471                      udev_device_get_devpath(dev), val);
 472                 util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
 473                 util_strlcat(syspath, val, sizeof(syspath));
 474                 udev_device_set_syspath(dev, syspath);
 475         } else {
 476                 struct udev_list_entry *entry;
 477
 478                 entry = udev_device_add_property(dev, key, val);
 479                 /* store in db */
 480                 udev_list_entry_set_flag(entry, 1);
 481         }
 482         return 0;
 483 }
 484
 485 static int import_file_into_properties(struct udev_device *dev, const char *filename)
 486 {
 487         FILE *f;
 488         char line[UTIL_LINE_SIZE];
 489
 490         f = fopen(filename, "r");
 491         if (f == NULL)
 492                 return -1;
 493         while (fgets(line, sizeof(line), f) != NULL)
 494                 import_property_from_string(dev, line);
 495         fclose(f);
 496         return 0;
 497 }
 498
 499 static int import_program_into_properties(struct udev_device *dev, const char *program)
 500 {
 501         struct udev *udev = udev_device_get_udev(dev);
 502         char **envp;
 503         char result[2048];
 504         size_t reslen;
 505         char *line;
 506
 507         envp = udev_device_get_properties_envp(dev);
 508         if (util_run_program(udev, program, envp, result, sizeof(result), &reslen) != 0)
 509                 return -1;
 510
 511         line = result;
 512         while (line != NULL) {
 513                 char *pos;
 514
 515                 pos = strchr(line, '\n');
 516                 if (pos != NULL) {
 517                         pos[0] = '\0';
 518                         pos = &pos[1];
 519                 }
 520                 import_property_from_string(dev, line);
 521                 line = pos;
 522         }
 523         return 0;
 524 }
 525
 526 static int import_parent_into_properties(struct udev_device *dev, const char *filter)
 527 {
 528         struct udev *udev = udev_device_get_udev(dev);
 529         struct udev_device *dev_parent;
 530         struct udev_list_entry *list_entry;
 531
 532         dev_parent = udev_device_get_parent(dev);
 533         if (dev_parent == NULL)
 534                 return -1;
 535
 536         dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
 537         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
 538                 const char *key = udev_list_entry_get_name(list_entry);
 539                 const char *val = udev_list_entry_get_value(list_entry);
 540
 541                 if (fnmatch(filter, key, 0) == 0) {
 542                         struct udev_list_entry *entry;
 543
 544                         dbg(udev, "import key '%s=%s'\n", key, val);
 545                         entry = udev_device_add_property(dev, key, val);
 546                         /* store in db */
 547                         udev_list_entry_set_flag(entry, 1);
 548                 }
 549         }
 550         return 0;
 551 }
 552
 553 #define WAIT_LOOP_PER_SECOND            50
 554 static int wait_for_file(struct udev_device *dev, const char *file, int timeout)
 555 {
 556         struct udev *udev = udev_device_get_udev(dev);
 557         char filepath[UTIL_PATH_SIZE];
 558         char devicepath[UTIL_PATH_SIZE];
 559         struct stat stats;
 560         int loop = timeout * WAIT_LOOP_PER_SECOND;
 561
 562         /* a relative path is a device attribute */
 563         devicepath[0] = '\0';
 564         if (file[0] != '/') {
 565                 util_strlcpy(devicepath, udev_get_sys_path(udev), sizeof(devicepath));
 566                 util_strlcat(devicepath, udev_device_get_devpath(dev), sizeof(devicepath));
 567
 568                 util_strlcpy(filepath, devicepath, sizeof(filepath));
 569                 util_strlcat(filepath, "/", sizeof(filepath));
 570                 util_strlcat(filepath, file, sizeof(filepath));
 571                 file = filepath;
 572         }
 573
 574         dbg(udev, "will wait %i sec for '%s'\n", timeout, file);
 575         while (--loop) {
 576                 /* lookup file */
 577                 if (stat(file, &stats) == 0) {
 578                         info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 579                         return 0;
 580                 }
 581                 /* make sure, the device did not disappear in the meantime */
 582                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 583                         info(udev, "device disappeared while waiting for '%s'\n", file);
 584                         return -2;
 585                 }
 586                 info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 587                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 588         }
 589         info(udev, "waiting for '%s' failed\n", file);
 590         return -1;
 591 }
 592
 593 static int attr_subst_subdir(char *attr, size_t len)
 594 {
 595         char *pos;
 596         int found = 0;
 597
 598         pos = strstr(attr, "/*/");
 599         if (pos != NULL) {
 600                 char str[UTIL_PATH_SIZE];
 601                 DIR *dir;
 602
 603                 pos[1] = '\0';
 604                 util_strlcpy(str, &pos[2], sizeof(str));
 605                 dir = opendir(attr);
 606                 if (dir != NULL) {
 607                         struct dirent *dent;
 608
 609                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 610                                 struct stat stats;
 611
 612                                 if (dent->d_name[0] == '.')
 613                                         continue;
 614                                 util_strlcat(attr, dent->d_name, len);
 615                                 util_strlcat(attr, str, len);
 616                                 if (stat(attr, &stats) == 0) {
 617                                         found = 1;
 618                                         break;
 619                                 }
 620                                 pos[1] = '\0';
 621                         }
 622                         closedir(dir);
 623                 }
 624                 if (!found)
 625                         util_strlcat(attr, str, len);
 626         }
 627
 628         return found;
 629 }
 630
 631 static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)
 632 {
 633         char *linepos;
 634         char *temp;
 635
 636         linepos = *line;
 637         if (linepos == NULL && linepos[0] == '\0')
 638                 return -1;
 639
 640         /* skip whitespace */
 641         while (isspace(linepos[0]) || linepos[0] == ',')
 642                 linepos++;
 643
 644         /* get the key */
 645         if (linepos[0] == '\0')
 646                 return -1;
 647         *key = linepos;
 648
 649         while (1) {
 650                 linepos++;
 651                 if (linepos[0] == '\0')
 652                         return -1;
 653                 if (isspace(linepos[0]))
 654                         break;
 655                 if (linepos[0] == '=')
 656                         break;
 657                 if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))
 658                         if (linepos[1] == '=')
 659                                 break;
 660         }
 661
 662         /* remember end of key */
 663         temp = linepos;
 664
 665         /* skip whitespace after key */
 666         while (isspace(linepos[0]))
 667                 linepos++;
 668         if (linepos[0] == '\0')
 669                 return -1;
 670
 671         /* get operation type */
 672         if (linepos[0] == '=' && linepos[1] == '=') {
 673                 *op = OP_MATCH;
 674                 linepos += 2;
 675         } else if (linepos[0] == '!' && linepos[1] == '=') {
 676                 *op = OP_NOMATCH;
 677                 linepos += 2;
 678         } else if (linepos[0] == '+' && linepos[1] == '=') {
 679                 *op = OP_ADD;
 680                 linepos += 2;
 681         } else if (linepos[0] == '=') {
 682                 *op = OP_ASSIGN;
 683                 linepos++;
 684         } else if (linepos[0] == ':' && linepos[1] == '=') {
 685                 *op = OP_ASSIGN_FINAL;
 686                 linepos += 2;
 687         } else
 688                 return -1;
 689
 690         /* terminate key */
 691         temp[0] = '\0';
 692
 693         /* skip whitespace after operator */
 694         while (isspace(linepos[0]))
 695                 linepos++;
 696         if (linepos[0] == '\0')
 697                 return -1;
 698
 699         /* get the value */
 700         if (linepos[0] == '"')
 701                 linepos++;
 702         else
 703                 return -1;
 704         *value = linepos;
 705
 706         /* terminate */
 707         temp = strchr(linepos, '"');
 708         if (!temp)
 709                 return -1;
 710         temp[0] = '\0';
 711         temp++;
 712         dbg(udev, "%s '%s'-'%s'\n", operation_str[*op], *key, *value);
 713
 714         /* move line to next key */
 715         *line = temp;
 716         return 0;
 717 }
 718
 719 /* extract possible KEY{attr} */
 720 static char *get_key_attribute(struct udev *udev, char *str)
 721 {
 722         char *pos;
 723         char *attr;
 724
 725         attr = strchr(str, '{');
 726         if (attr != NULL) {
 727                 attr++;
 728                 pos = strchr(attr, '}');
 729                 if (pos == NULL) {
 730                         err(udev, "missing closing brace for format\n");
 731                         return NULL;
 732                 }
 733                 pos[0] = '\0';
 734                 dbg(udev, "attribute='%s'\n", attr);
 735                 return attr;
 736         }
 737         return NULL;
 738 }
 739
 740 static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
 741                         enum operation_type op,
 742                         const char *value, const void *data)
 743 {
 744         struct token *token = &rule_tmp->token[rule_tmp->token_cur];
 745         const char *attr = data;
 746         enum string_glob_type glob;
 747
 748         memset(token, 0x00, sizeof(struct token));
 749
 750         switch (type) {
 751         case TK_M_ACTION:
 752         case TK_M_DEVPATH:
 753         case TK_M_KERNEL:
 754         case TK_M_SUBSYSTEM:
 755         case TK_M_DRIVER:
 756         case TK_M_WAITFOR:
 757         case TK_M_DEVLINK:
 758         case TK_M_NAME:
 759         case TK_M_KERNELS:
 760         case TK_M_SUBSYSTEMS:
 761         case TK_M_DRIVERS:
 762         case TK_M_PROGRAM:
 763         case TK_M_IMPORT_FILE:
 764         case TK_M_IMPORT_PROG:
 765         case TK_M_IMPORT_PARENT:
 766         case TK_M_RESULT:
 767         case TK_A_OWNER:
 768         case TK_A_GROUP:
 769         case TK_A_MODE:
 770         case TK_A_NAME:
 771         case TK_A_DEVLINK:
 772         case TK_A_GOTO:
 773                 token->key.value_off = add_string(rule_tmp->rules, value);
 774                 break;
 775         case TK_M_ENV:
 776         case TK_M_ATTR:
 777         case TK_M_ATTRS:
 778         case TK_A_ATTR:
 779         case TK_A_ENV:
 780                 token->key.value_off = add_string(rule_tmp->rules, value);
 781                 token->key.attr_off = add_string(rule_tmp->rules, attr);
 782                 break;
 783         case TK_M_TEST:
 784                 token->key.value_off = add_string(rule_tmp->rules, value);
 785                 if (data != NULL)
 786                         token->key.mode = *(mode_t *)data;
 787                 break;
 788         case TK_A_IGNORE_DEVICE:
 789         case TK_A_STRING_ESCAPE_NONE:
 790         case TK_A_STRING_ESCAPE_REPLACE:
 791         case TK_A_IGNORE_REMOVE:
 792         case TK_A_LAST_RULE:
 793                 break;
 794         case TK_A_RUN:
 795                 token->key.value_off = add_string(rule_tmp->rules, value);
 796                 token->key.ignore_error = *(int *)data;
 797                 break;
 798         case TK_A_NUM_FAKE_PART:
 799                 token->key.num_fake_part = *(int *)data;
 800                 break;
 801         case TK_A_DEVLINK_PRIO:
 802                 token->key.devlink_prio = *(int *)data;
 803                 break;
 804         case TK_A_OWNER_ID:
 805                 token->key.uid = *(uid_t *)data;
 806                 break;
 807         case TK_A_GROUP_ID:
 808                 token->key.gid = *(gid_t *)data;
 809                 break;
 810         case TK_A_MODE_ID:
 811                 token->key.mode = *(mode_t *)data;
 812                 break;
 813         case TK_A_EVENT_TIMEOUT:
 814                 token->key.event_timeout = *(int *)data;
 815                 break;
 816         case TK_RULE:
 817         case TK_M_PARENTS_MIN:
 818         case TK_M_PARENTS_MAX:
 819         case TK_M_MAX:
 820         case TK_END:
 821         case TK_UNSET:
 822                 err(rule_tmp->rules->udev, "wrong type %u\n", type);
 823                 return -1;
 824         }
 825
 826         glob = GL_PLAIN;
 827         if (value != NULL) {
 828                 if (type < TK_M_MAX) {
 829                         /* check if we need to split or call fnmatch() while matching rules */
 830                         int has_split;
 831                         int has_glob;
 832
 833                         has_split = (strchr(value, '|') != NULL);
 834                         has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL ||
 835                                     strchr(value, '[') != NULL || strchr(value, ']') != NULL);
 836                         if (has_split && has_glob) {
 837                                 glob = GL_SPLIT_GLOB;
 838                         } else if (has_split) {
 839                                 glob = GL_SPLIT;
 840                         } else if (has_glob) {
 841                                 if (strcmp(value, "?*") == 0)
 842                                         glob = GL_SOMETHING;
 843                                 else
 844                                         glob = GL_GLOB;
 845                         }
 846                 } else {
 847                         /* check if we need to substitute format strings for matching rules */
 848                         if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
 849                                 glob = GL_FORMAT;
 850                 }
 851         }
 852
 853         token->key.type = type;
 854         token->key.op = op;
 855         token->key.glob = glob;
 856         rule_tmp->token_cur++;
 857         if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
 858                 err(rule_tmp->rules->udev, "temporary rule array too small\n");
 859                 return -1;
 860         }
 861         return 0;
 862 }
 863
 864 #ifdef DEBUG
 865 static void dump_token(struct udev_rules *rules, struct token *token)
 866 {
 867         enum token_type type = token->type;
 868         enum operation_type op = token->key.op;
 869         enum string_glob_type glob = token->key.glob;
 870         const char *value = &rules->buf[token->key.value_off];
 871         const char *attr = &rules->buf[token->key.attr_off];
 872
 873         switch (type) {
 874         case TK_RULE:
 875                 {
 876                         const char *tks_ptr = (char *)rules->tokens;
 877                         const char *tk_ptr = (char *)token;
 878                         unsigned int off = tk_ptr - tks_ptr;
 879
 880                         dbg(rules->udev, "* RULE %s:%u, off: %u(%u), next: %u, label: '%s', flags: 0x%02x\n",
 881                             &rules->buf[token->rule.filename_off], token->rule.filename_line,
 882                             off / (unsigned int) sizeof(struct token), off,
 883                             token->rule.next_rule,
 884                             &rules->buf[token->rule.label_off],
 885                             token->rule.flags);
 886                         break;
 887                 }
 888         case TK_M_ACTION:
 889         case TK_M_DEVPATH:
 890         case TK_M_KERNEL:
 891         case TK_M_SUBSYSTEM:
 892         case TK_M_DRIVER:
 893         case TK_M_WAITFOR:
 894         case TK_M_DEVLINK:
 895         case TK_M_NAME:
 896         case TK_M_KERNELS:
 897         case TK_M_SUBSYSTEMS:
 898         case TK_M_DRIVERS:
 899         case TK_M_PROGRAM:
 900         case TK_M_IMPORT_FILE:
 901         case TK_M_IMPORT_PROG:
 902         case TK_M_IMPORT_PARENT:
 903         case TK_M_RESULT:
 904         case TK_A_NAME:
 905         case TK_A_DEVLINK:
 906         case TK_A_OWNER:
 907         case TK_A_GROUP:
 908         case TK_A_MODE:
 909         case TK_A_RUN:
 910                 dbg(rules->udev, "%s %s '%s'(%s)\n",
 911                     token_str[type], operation_str[op], value, string_glob_str[glob]);
 912                 break;
 913         case TK_M_ATTR:
 914         case TK_M_ATTRS:
 915         case TK_M_ENV:
 916         case TK_A_ATTR:
 917         case TK_A_ENV:
 918                 dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
 919                     token_str[type], operation_str[op], attr, value, string_glob_str[glob]);
 920                 break;
 921         case TK_A_IGNORE_DEVICE:
 922         case TK_A_STRING_ESCAPE_NONE:
 923         case TK_A_STRING_ESCAPE_REPLACE:
 924         case TK_A_LAST_RULE:
 925         case TK_A_IGNORE_REMOVE:
 926                 dbg(rules->udev, "%s\n", token_str[type]);
 927                 break;
 928         case TK_M_TEST:
 929                 dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
 930                     token_str[type], operation_str[op], value, string_glob_str[glob], token->key.mode);
 931                 break;
 932         case TK_A_NUM_FAKE_PART:
 933                 dbg(rules->udev, "%s %u\n", token_str[type], token->key.num_fake_part);
 934                 break;
 935         case TK_A_DEVLINK_PRIO:
 936                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.devlink_prio);
 937                 break;
 938         case TK_A_OWNER_ID:
 939                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.uid);
 940                 break;
 941         case TK_A_GROUP_ID:
 942                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.gid);
 943                 break;
 944         case TK_A_MODE_ID:
 945                 dbg(rules->udev, "%s %s %#o\n", token_str[type], operation_str[op], token->key.mode);
 946                 break;
 947         case TK_A_EVENT_TIMEOUT:
 948                 dbg(rules->udev, "%s %s %u\n", token_str[type], operation_str[op], token->key.event_timeout);
 949                 break;
 950         case TK_A_GOTO:
 951                 dbg(rules->udev, "%s '%s' %u\n", token_str[type], value, token->key.rule_goto);
 952                 break;
 953         case TK_END:
 954                 dbg(rules->udev, "* %s\n", token_str[type]);
 955                 break;
 956         case TK_M_PARENTS_MIN:
 957         case TK_M_PARENTS_MAX:
 958         case TK_M_MAX:
 959         case TK_UNSET:
 960                 dbg(rules->udev, "unknown type %u\n", type);
 961                 break;
 962         }
 963 }
 964
 965 static void dump_rules(struct udev_rules *rules)
 966 {
 967         unsigned int i;
 968
 969         dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",
 970             rules->token_cur,
 971             rules->token_cur * sizeof(struct token),
 972             rules->buf_count,
 973             rules->buf_cur);
 974         for(i = 0; i < rules->token_cur; i++)
 975                 dump_token(rules, &rules->tokens[i]);
 976 }
 977 #else
 978 static inline void dump_token(struct udev_rules *rules, struct token *token) {}
 979 static inline void dump_rules(struct udev_rules *rules) {}
 980 #endif /* DEBUG */
 981
 982 static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
 983 {
 984         unsigned int i;
 985         unsigned int start = 0;
 986         unsigned int end = rule_tmp->token_cur;
 987
 988         for (i = 0; i < rule_tmp->token_cur; i++) {
 989                 enum token_type next_val = TK_UNSET;
 990                 unsigned int next_idx;
 991                 unsigned int j;
 992
 993                 /* find smallest value */
 994                 for (j = start; j < end; j++) {
 995                         if (rule_tmp->token[j].type == TK_UNSET)
 996                                 continue;
 997                         if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
 998                                 next_val = rule_tmp->token[j].type;
 999                                 next_idx = j;
1000                         }
1001                 }
1002
1003                 /* add token and mark done */
1004                 if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
1005                         return -1;
1006                 rule_tmp->token[next_idx].type = TK_UNSET;
1007
1008                 /* shrink range */
1009                 if (next_idx == start)
1010                         start++;
1011                 if (next_idx+1 == end)
1012                         end--;
1013         }
1014         return 0;
1015 }
1016
1017 static int add_rule(struct udev_rules *rules, char *line,
1018                     const char *filename, unsigned int filename_off, unsigned int lineno)
1019 {
1020         int valid = 0;
1021         char *linepos;
1022         char *attr;
1023         int physdev = 0;
1024         struct rule_tmp rule_tmp;
1025
1026         memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
1027         rule_tmp.rules = rules;
1028         rule_tmp.rule.type = TK_RULE;
1029         rule_tmp.rule.rule.filename_off = filename_off;
1030         rule_tmp.rule.rule.filename_line = lineno;
1031
1032         linepos = line;
1033         while (1) {
1034                 char *key;
1035                 char *value;
1036                 enum operation_type op;
1037
1038                 if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
1039                         break;
1040
1041                 if (strcasecmp(key, "ACTION") == 0) {
1042                         if (op > OP_MATCH_MAX) {
1043                                 err(rules->udev, "invalid ACTION operation\n");
1044                                 goto invalid;
1045                         }
1046                         rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
1047                         valid = 1;
1048                         continue;
1049                 }
1050
1051                 if (strcasecmp(key, "DEVPATH") == 0) {
1052                         if (op > OP_MATCH_MAX) {
1053                                 err(rules->udev, "invalid DEVPATH operation\n");
1054                                 goto invalid;
1055                         }
1056                         rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
1057                         valid = 1;
1058                         continue;
1059                 }
1060
1061                 if (strcasecmp(key, "KERNEL") == 0) {
1062                         if (op > OP_MATCH_MAX) {
1063                                 err(rules->udev, "invalid KERNEL operation\n");
1064                                 goto invalid;
1065                         }
1066                         rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
1067                         valid = 1;
1068                         continue;
1069                 }
1070
1071                 if (strcasecmp(key, "SUBSYSTEM") == 0) {
1072                         if (op > OP_MATCH_MAX) {
1073                                 err(rules->udev, "invalid SUBSYSTEM operation\n");
1074                                 goto invalid;
1075                         }
1076                         /* bus, class, subsystem events should all be the same */
1077                         if (strcmp(value, "subsystem") == 0 ||
1078                             strcmp(value, "bus") == 0 ||
1079                             strcmp(value, "class") == 0) {
1080                                 if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)
1081                                         err(rules->udev, "'%s' must be specified as 'subsystem' \n"
1082                                             "please fix it in %s:%u", value, filename, lineno);
1083                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);
1084                         } else
1085                                 rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);
1086                         valid = 1;
1087                         continue;
1088                 }
1089
1090                 if (strcasecmp(key, "DRIVER") == 0) {
1091                         if (op > OP_MATCH_MAX) {
1092                                 err(rules->udev, "invalid DRIVER operation\n");
1093                                 goto invalid;
1094                         }
1095                         rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
1096                         valid = 1;
1097                         continue;
1098                 }
1099
1100                 if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
1101                         attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);
1102                         if (attr == NULL) {
1103                                 err(rules->udev, "error parsing ATTR attribute\n");
1104                                 goto invalid;
1105                         }
1106                         if (op < OP_MATCH_MAX) {
1107                                 rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
1108                         } else {
1109                                 rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
1110                         }
1111                         valid = 1;
1112                         continue;
1113                 }
1114
1115                 if (strcasecmp(key, "KERNELS") == 0 ||
1116                     strcasecmp(key, "ID") == 0) {
1117                         if (op > OP_MATCH_MAX) {
1118                                 err(rules->udev, "invalid KERNELS operation\n");
1119                                 goto invalid;
1120                         }
1121                         rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
1122                         valid = 1;
1123                         continue;
1124                 }
1125
1126                 if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
1127                     strcasecmp(key, "BUS") == 0) {
1128                         if (op > OP_MATCH_MAX) {
1129                                 err(rules->udev, "invalid SUBSYSTEMS operation\n");
1130                                 goto invalid;
1131                         }
1132                         rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
1133                         valid = 1;
1134                         continue;
1135                 }
1136
1137                 if (strcasecmp(key, "DRIVERS") == 0) {
1138                         if (op > OP_MATCH_MAX) {
1139                                 err(rules->udev, "invalid DRIVERS operation\n");
1140                                 goto invalid;
1141                         }
1142                         rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
1143                         valid = 1;
1144                         continue;
1145                 }
1146
1147                 if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
1148                     strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
1149                         if (op > OP_MATCH_MAX) {
1150                                 err(rules->udev, "invalid ATTRS operation\n");
1151                                 goto invalid;
1152                         }
1153                         attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);
1154                         if (attr == NULL) {
1155                                 err(rules->udev, "error parsing ATTRS attribute\n");
1156                                 goto invalid;
1157                         }
1158                         if (strncmp(attr, "device/", 7) == 0)
1159                                 err(rules->udev, "the 'device' link may not be available in a future kernel, "
1160                                     "please fix it in %s:%u", filename, lineno);
1161                         else if (strstr(attr, "../") != NULL)
1162                                 err(rules->udev, "do not reference parent sysfs directories directly, "
1163                                     "it may break with a future kernel, please fix it in %s:%u", filename, lineno);
1164                         rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
1165                         valid = 1;
1166                         continue;
1167                 }
1168
1169                 if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
1170                         attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);
1171                         if (attr == NULL) {
1172                                 err(rules->udev, "error parsing ENV attribute\n");
1173                                 goto invalid;
1174                         }
1175                         if (strncmp(attr, "PHYSDEV", 7) == 0)
1176                                 physdev = 1;
1177                         if (op < OP_MATCH_MAX) {
1178                                 if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)
1179                                         goto invalid;
1180                         } else {
1181                                 if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)
1182                                         goto invalid;
1183                         }
1184                         valid = 1;
1185                         continue;
1186                 }
1187
1188                 if (strcasecmp(key, "PROGRAM") == 0) {
1189                         rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
1190                         valid = 1;
1191                         continue;
1192                 }
1193
1194                 if (strcasecmp(key, "RESULT") == 0) {
1195                         if (op > OP_MATCH_MAX) {
1196                                 err(rules->udev, "invalid RESULT operation\n");
1197                                 goto invalid;
1198                         }
1199                         rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
1200                         valid = 1;
1201                         continue;
1202                 }
1203
1204                 if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
1205                         attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);
1206                         if (attr != NULL && strstr(attr, "program")) {
1207                                 dbg(rules->udev, "IMPORT will be executed\n");
1208                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1209                                 valid = 1;
1210                         } else if (attr != NULL && strstr(attr, "file")) {
1211                                 dbg(rules->udev, "IMPORT will be included as file\n");
1212                                 rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1213                                 valid = 1;
1214                         } else if (attr != NULL && strstr(attr, "parent")) {
1215                                 dbg(rules->udev, "IMPORT will include the parent values\n");
1216                                 rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
1217                                 valid = 1;
1218                         } else {
1219                                 /* figure it out if it is executable */
1220                                 char file[UTIL_PATH_SIZE];
1221                                 char *pos;
1222                                 struct stat statbuf;
1223
1224                                 util_strlcpy(file, value, sizeof(file));
1225                                 pos = strchr(file, ' ');
1226                                 if (pos)
1227                                         pos[0] = '\0';
1228
1229                                 /* allow programs in /lib/udev called without the path */
1230                                 if (strchr(file, '/') == NULL) {
1231                                         util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file));
1232                                         util_strlcat(file, value, sizeof(file));
1233                                         pos = strchr(file, ' ');
1234                                         if (pos)
1235                                                 pos[0] = '\0';
1236                                 }
1237
1238                                 dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
1239                                 if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
1240                                         dbg(rules->udev, "IMPORT will be executed (autotype)\n");
1241                                         rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
1242                                         valid = 1;
1243                                 } else {
1244                                         dbg(rules->udev, "IMPORT will be included as file (autotype)\n");
1245                                         rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
1246                                         valid = 1;
1247                                 }
1248                         }
1249                         continue;
1250                 }
1251
1252                 if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
1253                         mode_t mode = 0;
1254
1255                         if (op > OP_MATCH_MAX) {
1256                                 err(rules->udev, "invalid TEST operation\n");
1257                                 goto invalid;
1258                         }
1259                         attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);
1260                         if (attr != NULL) {
1261                                 mode = strtol(attr, NULL, 8);
1262                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);
1263                         } else {
1264                                 rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);
1265                         }
1266                         valid = 1;
1267                         continue;
1268                 }
1269
1270                 if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
1271                         int flag = 0;
1272
1273                         attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);
1274                         if (attr != NULL && strstr(attr, "ignore_error"))
1275                                 flag = 1;
1276                         rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);
1277                         valid = 1;
1278                         continue;
1279                 }
1280
1281                 if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
1282                         rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);
1283                         valid = 1;
1284                         continue;
1285                 }
1286
1287                 if (strcasecmp(key, "LABEL") == 0) {
1288                         rule_tmp.rule.rule.label_off = add_string(rules, value);
1289                         valid = 1;
1290                         continue;
1291                 }
1292
1293                 if (strcasecmp(key, "GOTO") == 0) {
1294                         rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
1295                         valid = 1;
1296                         continue;
1297                 }
1298
1299                 if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
1300                         if (op < OP_MATCH_MAX) {
1301                                 rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
1302                         } else {
1303                                 if (value[0] == '\0')
1304                                         dbg(rules->udev, "name empty, node creation suppressed\n");
1305                                 rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
1306                                 attr = get_key_attribute(rules->udev, key + sizeof("NAME")-1);
1307                                 if (attr != NULL) {
1308                                         if (strstr(attr, "all_partitions") != NULL) {
1309                                                 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1310
1311                                                 dbg(rules->udev, "creation of partition nodes requested\n");
1312                                                 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1313                                         }
1314                                         if (strstr(attr, "ignore_remove") != NULL) {
1315                                                 dbg(rules->udev, "remove event should be ignored\n");
1316                                                 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1317                                         }
1318                                 }
1319                         }
1320                         rule_tmp.rule.rule.flags = 1;
1321                         continue;
1322                 }
1323
1324                 if (strcasecmp(key, "SYMLINK") == 0) {
1325                         if (op < OP_MATCH_MAX)
1326                                 rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
1327                         else
1328                                 rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
1329                         rule_tmp.rule.rule.flags = 1;
1330                         valid = 1;
1331                         continue;
1332                 }
1333
1334                 if (strcasecmp(key, "OWNER") == 0) {
1335                         uid_t uid;
1336                         char *endptr;
1337
1338                         uid = strtoul(value, &endptr, 10);
1339                         if (endptr[0] == '\0') {
1340                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1341                         } else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
1342                                 uid = add_uid(rules, value);
1343                                 rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
1344                         } else {
1345                                 rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
1346                         }
1347                         rule_tmp.rule.rule.flags = 1;
1348                         valid = 1;
1349                         continue;
1350                 }
1351
1352                 if (strcasecmp(key, "GROUP") == 0) {
1353                         gid_t gid;
1354                         char *endptr;
1355
1356                         gid = strtoul(value, &endptr, 10);
1357                         if (endptr[0] == '\0') {
1358                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1359                         } else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
1360                                 gid = add_gid(rules, value);
1361                                 rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
1362                         } else {
1363                                 rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);
1364                         }
1365                         rule_tmp.rule.rule.flags = 1;
1366                         valid = 1;
1367                         continue;
1368                 }
1369
1370                 if (strcasecmp(key, "MODE") == 0) {
1371                         mode_t mode;
1372                         char *endptr;
1373
1374                         mode = strtol(value, &endptr, 8);
1375                         if (endptr[0] == '\0')
1376                                 rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);
1377                         else
1378                                 rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);
1379                         rule_tmp.rule.rule.flags = 1;
1380                         valid = 1;
1381                         continue;
1382                 }
1383
1384                 if (strcasecmp(key, "OPTIONS") == 0) {
1385                         const char *pos;
1386
1387                         if (strstr(value, "last_rule") != NULL) {
1388                                 dbg(rules->udev, "last rule to be applied\n");
1389                                 rule_add_key(&rule_tmp, TK_A_LAST_RULE, 0, NULL, NULL);
1390                         }
1391                         if (strstr(value, "ignore_device") != NULL) {
1392                                 dbg(rules->udev, "device should be ignored\n");
1393                                 rule_add_key(&rule_tmp, TK_A_IGNORE_DEVICE, 0, NULL, NULL);
1394                         }
1395                         if (strstr(value, "ignore_remove") != NULL) {
1396                                 dbg(rules->udev, "remove event should be ignored\n");
1397                                 rule_add_key(&rule_tmp, TK_A_IGNORE_REMOVE, 0, NULL, NULL);
1398                         }
1399                         pos = strstr(value, "link_priority=");
1400                         if (pos != NULL) {
1401                                 int prio = atoi(&pos[strlen("link_priority=")]);
1402
1403                                 rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);
1404                                 dbg(rules->udev, "link priority=%i\n", prio);
1405                         }
1406                         pos = strstr(value, "event_timeout=");
1407                         if (pos != NULL) {
1408                                 int tout = atoi(&pos[strlen("event_timeout=")]);
1409
1410                                 rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);
1411                                 dbg(rules->udev, "event timout=%i\n", tout);
1412                         }
1413                         pos = strstr(value, "string_escape=");
1414                         if (pos != NULL) {
1415                                 pos = &pos[strlen("string_escape=")];
1416                                 if (strncmp(pos, "none", strlen("none")) == 0)
1417                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);
1418                                 else if (strncmp(pos, "replace", strlen("replace")) == 0)
1419                                         rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);
1420                         }
1421                         if (strstr(value, "all_partitions") != NULL) {
1422                                 int num = DEFAULT_FAKE_PARTITIONS_COUNT;
1423
1424                                 rule_add_key(&rule_tmp, TK_A_NUM_FAKE_PART, 0, NULL, &num);
1425                                 dbg(rules->udev, "creation of partition nodes requested\n");
1426                         }
1427                         valid = 1;
1428                         continue;
1429                 }
1430                 err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
1431         }
1432
1433         if (physdev)
1434                 err(rules->udev, "PHYSDEV* values are deprecated and not available on recent kernels, \n"
1435                     "please fix it in %s:%u", filename, lineno);
1436
1437         /* skip line if not any valid key was found */
1438         if (!valid)
1439                 goto invalid;
1440
1441         /* add rule token */
1442         if (add_token(rules, &rule_tmp.rule) != 0)
1443                 goto invalid;
1444
1445         /* add tokens to list, sorted by type */
1446         if (sort_token(rules, &rule_tmp) != 0)
1447                 goto invalid;
1448         return 0;
1449 invalid:
1450         err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
1451         return -1;
1452 }
1453
1454 static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
1455 {
1456         FILE *f;
1457         unsigned int first_token;
1458         char line[UTIL_LINE_SIZE];
1459         int line_nr = 0;
1460         unsigned int i;
1461
1462         info(rules->udev, "reading '%s' as rules file\n", filename);
1463
1464         f = fopen(filename, "r");
1465         if (f == NULL)
1466                 return -1;
1467
1468         first_token = rules->token_cur;
1469
1470         while(fgets(line, sizeof(line), f) != NULL) {
1471                 char *key;
1472                 size_t len;
1473
1474                 /* skip whitespace */
1475                 line_nr++;
1476                 key = line;
1477                 while (isspace(key[0]))
1478                         key++;
1479
1480                 /* comment */
1481                 if (key[0] == '#')
1482                         continue;
1483
1484                 len = strlen(line);
1485                 if (len < 3)
1486                         continue;
1487
1488                 /* continue reading if backslash+newline is found */
1489                 while (line[len-2] == '\\') {
1490                         if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)
1491                                 break;
1492                         line_nr++;
1493                         len = strlen(line);
1494                 }
1495
1496                 if (len+1 >= sizeof(line)) {
1497                         err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);
1498                         continue;
1499                 }
1500                 add_rule(rules, key, filename, filename_off, line_nr);
1501         }
1502         fclose(f);
1503
1504         /* link GOTOs to LABEL rules in this file to be able to fast-forward */
1505         for (i = first_token+1; i < rules->token_cur; i++) {
1506                 if (rules->tokens[i].type == TK_A_GOTO) {
1507                         char *label = &rules->buf[rules->tokens[i].key.value_off];
1508                         unsigned int j;
1509
1510                         for (j = i+1; j < rules->token_cur; j++) {
1511                                 if (rules->tokens[j].type != TK_RULE)
1512                                         continue;
1513                                 if (rules->tokens[j].rule.label_off == 0)
1514                                         continue;
1515                                 if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)
1516                                         continue;
1517                                 rules->tokens[i].key.rule_goto = j;
1518                         }
1519                         if (rules->tokens[i].key.rule_goto == 0)
1520                                 err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);
1521                 }
1522         }
1523         return 0;
1524 }
1525
1526 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
1527 {
1528         struct dirent *ent;
1529         DIR *dir;
1530         char filename[UTIL_PATH_SIZE];
1531
1532         dbg(udev, "open directory '%s'\n", dirname);
1533         dir = opendir(dirname);
1534         if (dir == NULL) {
1535                 err(udev, "unable to open '%s': %m\n", dirname);
1536                 return -1;
1537         }
1538
1539         while (1) {
1540                 ent = readdir(dir);
1541                 if (ent == NULL || ent->d_name[0] == '\0')
1542                         break;
1543
1544                 if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
1545                         continue;
1546
1547                 /* look for file matching with specified suffix */
1548                 if (suffix != NULL) {
1549                         const char *ext;
1550
1551                         ext = strrchr(ent->d_name, '.');
1552                         if (ext == NULL)
1553                                 continue;
1554                         if (strcmp(ext, suffix) != 0)
1555                                 continue;
1556                 }
1557                 dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
1558
1559                 snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
1560                 filename[sizeof(filename)-1] = '\0';
1561                 udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
1562         }
1563
1564         closedir(dir);
1565         return 0;
1566 }
1567
1568 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
1569 {
1570         struct udev_rules *rules;
1571         struct stat statbuf;
1572         struct udev_list_node file_list;
1573         struct udev_list_entry *file_loop, *file_tmp;
1574         unsigned int prev_rule;
1575         struct token end_token;
1576         unsigned int i;
1577
1578         rules = malloc(sizeof(struct udev_rules));
1579         if (rules == NULL)
1580                 return NULL;
1581         memset(rules, 0x00, sizeof(struct udev_rules));
1582         rules->udev = udev;
1583         rules->resolve_names = resolve_names;
1584         udev_list_init(&file_list);
1585
1586         /* init token array and string buffer */
1587         rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));
1588         if (rules->tokens == NULL)
1589                 return NULL;
1590         rules->token_max = PREALLOC_TOKEN;
1591         rules->buf = malloc(PREALLOC_STRBUF);
1592         if (rules->buf == NULL)
1593                 return NULL;
1594         rules->buf_max = PREALLOC_STRBUF;
1595         /* offset 0 is always '\0' */
1596         rules->buf[0] = '\0';
1597         rules->buf_cur = 1;
1598         dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1599             rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1600
1601         if (udev_get_rules_path(udev) != NULL) {
1602                 /* custom rules location for testing */
1603                 add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
1604         } else {
1605                 char filename[PATH_MAX];
1606                 struct udev_list_node sort_list;
1607                 struct udev_list_entry *sort_loop, *sort_tmp;
1608
1609                 /* read user/custom rules */
1610                 add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
1611
1612                 /* read dynamic/temporary rules */
1613                 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
1614                 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
1615                 if (stat(filename, &statbuf) != 0) {
1616                         util_create_path(udev, filename);
1617                         udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
1618                         mkdir(filename, 0755);
1619                         udev_selinux_resetfscreatecon(udev);
1620                 }
1621                 udev_list_init(&sort_list);
1622                 add_matching_files(udev, &sort_list, filename, ".rules");
1623
1624                 /* read default rules */
1625                 add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/rules.d", ".rules");
1626
1627                 /* sort all rules files by basename into list of files */
1628                 udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
1629                         const char *sort_name = udev_list_entry_get_name(sort_loop);
1630                         const char *sort_base = strrchr(sort_name, '/');
1631
1632                         if (sort_base == NULL)
1633                                 continue;
1634
1635                         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1636                                 const char *file_name = udev_list_entry_get_name(file_loop);
1637                                 const char *file_base = strrchr(file_name, '/');
1638
1639                                 if (file_base == NULL)
1640                                         continue;
1641                                 if (strcmp(file_base, sort_base) == 0) {
1642                                         info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
1643                                              file_name, sort_name);
1644                                         udev_list_entry_remove(sort_loop);
1645                                         sort_loop = NULL;
1646                                         break;
1647                                 }
1648                                 if (strcmp(file_base, sort_base) > 0)
1649                                         break;
1650                         }
1651                         if (sort_loop != NULL)
1652                                 udev_list_entry_move_before(sort_loop, file_loop);
1653                 }
1654         }
1655
1656         /* add all filenames to the string buffer */
1657         udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
1658                 const char *filename = udev_list_entry_get_name(file_loop);
1659                 unsigned int filename_off;
1660
1661                 filename_off = add_string(rules, filename);
1662                 /* the offset in the rule is limited to unsigned short */
1663                 if (filename_off < USHRT_MAX)
1664                         udev_list_entry_set_flag(file_loop, filename_off);
1665         }
1666
1667         /* parse list of files */
1668         udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
1669                 const char *filename = udev_list_entry_get_name(file_loop);
1670                 unsigned int filename_off = udev_list_entry_get_flag(file_loop);
1671
1672                 if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
1673                         parse_file(rules, filename, filename_off);
1674                 else
1675                         info(udev, "can not read '%s'\n", filename);
1676                 udev_list_entry_remove(file_loop);
1677         }
1678
1679         memset(&end_token, 0x00, sizeof(struct token));
1680         end_token.type = TK_END;
1681         add_token(rules, &end_token);
1682
1683         /* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */
1684         prev_rule = 0;
1685         for (i = 1; i < rules->token_cur; i++) {
1686                 if (rules->tokens[i].type == TK_RULE) {
1687                         rules->tokens[prev_rule].rule.next_rule = i;
1688                         prev_rule = i;
1689                 }
1690         }
1691
1692         /* shrink allocated token and string buffer */
1693         if (rules->token_cur < rules->token_max) {
1694                 struct token *tokens;
1695
1696                 tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));
1697                 if (tokens != NULL || rules->token_cur == 0) {
1698                         rules->tokens = tokens;
1699                         rules->token_max = rules->token_cur;
1700                 }
1701         }
1702         if (rules->buf_cur < rules->buf_max) {
1703                 char *buf;
1704
1705                 buf = realloc(rules->buf, rules->buf_cur);
1706                 if (buf != NULL || rules->buf_cur == 0) {
1707                         rules->buf = buf;
1708                         rules->buf_max = rules->buf_cur;
1709                 }
1710         }
1711         info(udev, "shrunk to %lu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
1712              rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
1713
1714         /* cleanup uid/gid cache */
1715         free(rules->uids);
1716         rules->uids = NULL;
1717         rules->uids_cur = 0;
1718         rules->uids_max = 0;
1719         free(rules->gids);
1720         rules->gids = NULL;
1721         rules->gids_cur = 0;
1722         rules->gids_max = 0;
1723
1724         dump_rules(rules);
1725         return rules;
1726 }
1727
1728 void udev_rules_unref(struct udev_rules *rules)
1729 {
1730         if (rules == NULL)
1731                 return;
1732         free(rules->tokens);
1733         free(rules->buf);
1734         free(rules->uids);
1735         free(rules->gids);
1736         free(rules);
1737 }
1738
1739 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
1740 {
1741         char *key_value = &rules->buf[token->key.value_off];
1742         char *pos;
1743         int match = 0;
1744
1745         if (val == NULL)
1746                 val = "";
1747
1748         switch (token->key.glob) {
1749         case GL_PLAIN:
1750                 match = (strcmp(key_value, val) == 0);
1751                 break;
1752         case GL_GLOB:
1753                 match = (fnmatch(key_value, val, 0) == 0);
1754                 break;
1755         case GL_SPLIT:
1756                 {
1757                         const char *split;
1758                         size_t len;
1759
1760                         split = &rules->buf[token->key.value_off];
1761                         len = strlen(val);
1762                         while (1) {
1763                                 const char *next;
1764
1765                                 next = strchr(split, '|');
1766                                 if (next != NULL) {
1767                                         size_t matchlen = (size_t)(next - split);
1768
1769                                         match = (matchlen == len && strncmp(split, val, matchlen) == 0);
1770                                         if (match)
1771                                                 break;
1772                                 } else {
1773                                         match = (strcmp(split, val) == 0);
1774                                         break;
1775                                 }
1776                                 split = &next[1];
1777                         }
1778                         break;
1779                 }
1780         case GL_SPLIT_GLOB:
1781                 {
1782                         char value[UTIL_PATH_SIZE];
1783
1784                         util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value));
1785                         key_value = value;
1786                         while (key_value != NULL) {
1787                                 pos = strchr(key_value, '|');
1788                                 if (pos != NULL) {
1789                                         pos[0] = '\0';
1790                                         pos = &pos[1];
1791                                 }
1792                                 dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str[token->type], key_value, val);
1793                                 match = (fnmatch(key_value, val, 0) == 0);
1794                                 if (match)
1795                                         break;
1796                                 key_value = pos;
1797                         }
1798                         break;
1799                 }
1800         case GL_SOMETHING:
1801                 match = (val[0] != '\0');
1802                 break;
1803         case GL_FORMAT:
1804         case GL_UNSET:
1805                 return -1;
1806         }
1807
1808         if (match && (token->key.op == OP_MATCH)) {
1809                 dbg(rules->udev, "%s is true (matching value)\n", token_str[token->type]);
1810                 return 0;
1811         }
1812         if (!match && (token->key.op == OP_NOMATCH)) {
1813                 dbg(rules->udev, "%s is true (non-matching value)\n", token_str[token->type]);
1814                 return 0;
1815         }
1816         dbg(rules->udev, "%s is not true\n", token_str[token->type]);
1817         return -1;
1818 }
1819
1820 static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)
1821 {
1822         const char *key_name = &rules->buf[cur->key.attr_off];
1823         const char *key_value = &rules->buf[cur->key.value_off];
1824         char value[UTIL_NAME_SIZE];
1825         size_t len;
1826
1827         value[0] = '\0';
1828         if (key_name[0] == '[') {
1829                 char attr[UTIL_PATH_SIZE];
1830
1831                 util_strlcpy(attr, key_name, sizeof(attr));
1832                 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
1833         }
1834         if (value[0] == '\0') {
1835                 const char *val;
1836
1837                 val = udev_device_get_sysattr_value(dev, key_name);
1838                 if (val == NULL)
1839                         return -1;
1840                 util_strlcpy(value, val, sizeof(value));
1841         }
1842
1843         /* strip trailing whitespace of value, if not asked to match for it */
1844         len = strlen(key_value);
1845         if (len > 0 && !isspace(key_value[len-1])) {
1846                 len = strlen(value);
1847                 while (len > 0 && isspace(value[--len]))
1848                         value[len] = '\0';
1849                 dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);
1850         }
1851         return match_key(rules, cur, value);
1852 }
1853
1854 enum escape_type {
1855         ESCAPE_UNSET,
1856         ESCAPE_NONE,
1857         ESCAPE_REPLACE,
1858 };
1859
1860 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
1861 {
1862         struct token *cur;
1863         struct token *rule;
1864         enum escape_type esc = ESCAPE_UNSET;
1865         int can_set_name;
1866
1867         if (rules->tokens == NULL)
1868                 return -1;
1869
1870         can_set_name = ((strcmp(udev_device_get_action(event->dev), "add") == 0 ||
1871                          strcmp(udev_device_get_action(event->dev), "change") == 0) &&
1872                         (major(udev_device_get_devnum(event->dev)) > 0 ||
1873                          strcmp(udev_device_get_subsystem(event->dev), "net") == 0));
1874
1875         /* loop through token list, match, run actions or forward to next rule */
1876         cur = &rules->tokens[0];
1877         rule = cur;
1878         while (1) {
1879                 unsigned int idx;
1880
1881                 dump_token(rules, cur);
1882                 switch (cur->type) {
1883                 case TK_RULE:
1884                         /* current rule */
1885                         rule = cur;
1886                         /* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */
1887                         if (!can_set_name && rule->rule.flags)
1888                                 ;//goto nomatch;
1889                         esc = ESCAPE_UNSET;
1890                         break;
1891                 case TK_M_ACTION:
1892                         if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)
1893                                 goto nomatch;
1894                         break;
1895                 case TK_M_DEVPATH:
1896                         if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)
1897                                 goto nomatch;
1898                         break;
1899                 case TK_M_KERNEL:
1900                         if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)
1901                                 goto nomatch;
1902                         break;
1903                 case TK_M_DEVLINK:
1904                         {
1905                                 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
1906                                 struct udev_list_entry *list_entry;
1907                                 int match = 0;
1908
1909                                 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {
1910                                         const char *devlink;
1911
1912                                         devlink =  &udev_list_entry_get_name(list_entry)[devlen];
1913                                         if (match_key(rules, cur, devlink) == 0) {
1914                                                 match = 1;
1915                                                 break;
1916                                         }
1917                                 }
1918                                 if (!match)
1919                                         goto nomatch;
1920                                 break;
1921                         }
1922                 case TK_M_NAME:
1923                         if (match_key(rules, cur, event->name) != 0)
1924                                 goto nomatch;
1925                         break;
1926                 case TK_M_ENV:
1927                         {
1928                                 struct udev_list_entry *list_entry;
1929                                 const char *key_name = &rules->buf[cur->key.attr_off];
1930                                 const char *value;
1931
1932                                 list_entry = udev_device_get_properties_list_entry(event->dev);
1933                                 list_entry = udev_list_entry_get_by_name(list_entry, key_name);
1934                                 value = udev_list_entry_get_value(list_entry);
1935                                 if (value == NULL) {
1936                                         dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
1937                                         value = "";
1938                                 }
1939                                 if (match_key(rules, cur, value))
1940                                         goto nomatch;
1941                                 break;
1942                         }
1943                 case TK_M_SUBSYSTEM:
1944                         if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)
1945                                 goto nomatch;
1946                         break;
1947                 case TK_M_DRIVER:
1948                         if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)
1949                                 goto nomatch;
1950                         break;
1951                 case TK_M_WAITFOR:
1952                         {
1953                                 char filename[UTIL_PATH_SIZE];
1954                                 int found;
1955
1956                                 util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename));
1957                                 udev_event_apply_format(event, filename, sizeof(filename));
1958                                 found = (wait_for_file(event->dev, filename, 10) == 0);
1959                                 if (!found && (cur->key.op != OP_NOMATCH))
1960                                         goto nomatch;
1961                                 break;
1962                         }
1963                 case TK_M_ATTR:
1964                         if (match_attr(rules, event->dev, event, cur) != 0)
1965                                 goto nomatch;
1966                         break;
1967                 case TK_M_KERNELS:
1968                 case TK_M_SUBSYSTEMS:
1969                 case TK_M_DRIVERS:
1970                 case TK_M_ATTRS:
1971                         {
1972                                 struct token *next;
1973
1974                                 /* get whole sequence of parent matches */
1975                                 next = cur;
1976                                 while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)
1977                                         next++;
1978
1979                                 /* loop over parents */
1980                                 event->dev_parent = event->dev;
1981                                 while (1) {
1982                                         struct token *key;
1983
1984                                         dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));
1985                                         /* loop over sequence of parent match keys */
1986                                         for (key = cur; key < next; key++ ) {
1987                                                 dump_token(rules, key);
1988                                                 switch(key->type) {
1989                                                 case TK_M_KERNELS:
1990                                                         if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)
1991                                                                 goto try_parent;
1992                                                         break;
1993                                                 case TK_M_SUBSYSTEMS:
1994                                                         if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)
1995                                                                 goto try_parent;
1996                                                         break;
1997                                                 case TK_M_DRIVERS:
1998                                                         if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)
1999                                                                 goto try_parent;
2000                                                         break;
2001                                                 case TK_M_ATTRS:
2002                                                         if (match_attr(rules, event->dev_parent, event, key) != 0)
2003                                                                 goto try_parent;
2004                                                         break;
2005                                                 default:
2006                                                         goto nomatch;
2007                                                 }
2008                                                 dbg(event->udev, "parent key matched\n");
2009                                         }
2010                                         dbg(event->udev, "all parent keys matched\n");
2011                                         /* all keys matched */
2012                                         break;
2013
2014                                 try_parent:
2015                                         event->dev_parent = udev_device_get_parent(event->dev_parent);
2016                                         if (event->dev_parent == NULL)
2017                                                 goto nomatch;
2018                                 }
2019                                 /* move behind our sequence of parent match keys */
2020                                 cur = next;
2021                                 continue;
2022                         }
2023                 case TK_M_TEST:
2024                         {
2025                                 char filename[UTIL_PATH_SIZE];
2026                                 struct stat statbuf;
2027                                 int match;
2028
2029                                 util_strlcpy(filename, &rules->buf[cur->key.value_off], sizeof(filename));
2030                                 udev_event_apply_format(event, filename, sizeof(filename));
2031                                 if (util_resolve_subsys_kernel(event->udev, NULL, filename, sizeof(filename), 0) != 0)
2032                                         if (filename[0] != '/') {
2033                                                 char tmp[UTIL_PATH_SIZE];
2034
2035                                                 util_strlcpy(tmp, udev_device_get_syspath(event->dev), sizeof(tmp));
2036                                                 util_strlcat(tmp, "/", sizeof(tmp));
2037                                                 util_strlcat(tmp, filename, sizeof(tmp));
2038                                                 util_strlcpy(filename, tmp, sizeof(filename));
2039                                         }
2040
2041                                 attr_subst_subdir(filename, sizeof(filename));
2042
2043                                 match = (stat(filename, &statbuf) == 0);
2044                                 dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
2045                                 if (match && cur->key.mode > 0) {
2046                                         match = ((statbuf.st_mode & cur->key.mode) > 0);
2047                                         dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
2048                                             match ? "matches" : "does not match", cur->key.mode);
2049                                 }
2050                                 if (match && cur->key.op == OP_NOMATCH)
2051                                         goto nomatch;
2052                                 if (!match && cur->key.op == OP_MATCH)
2053                                         goto nomatch;
2054                                 break;
2055                         }
2056                 case TK_M_PROGRAM:
2057                         {
2058                                 char program[UTIL_PATH_SIZE];
2059                                 char **envp;
2060                                 char result[UTIL_PATH_SIZE];
2061
2062                                 free(event->program_result);
2063                                 event->program_result = NULL;
2064                                 util_strlcpy(program, &rules->buf[cur->key.value_off], sizeof(program));
2065                                 udev_event_apply_format(event, program, sizeof(program));
2066                                 envp = udev_device_get_properties_envp(event->dev);
2067                                 if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL) != 0) {
2068                                         if (cur->key.op != OP_NOMATCH)
2069                                                 goto nomatch;
2070                                 } else {
2071                                         int count;
2072
2073                                         util_remove_trailing_chars(result, '\n');
2074                                         if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2075                                                 count = util_replace_chars(result, ALLOWED_CHARS_INPUT);
2076                                                 if (count > 0)
2077                                                         info(event->udev, "%i character(s) replaced\n" , count);
2078                                         }
2079                                         event->program_result = strdup(result);
2080                                         dbg(event->udev, "storing result '%s'\n", event->program_result);
2081                                         if (cur->key.op == OP_NOMATCH)
2082                                                 goto nomatch;
2083                                 }
2084                                 break;
2085                         }
2086                 case TK_M_IMPORT_FILE:
2087                         {
2088                                 char import[UTIL_PATH_SIZE];
2089
2090                                 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2091                                 udev_event_apply_format(event, import, sizeof(import));
2092                                 if (import_file_into_properties(event->dev, import) != 0)
2093                                         if (cur->key.op != OP_NOMATCH)
2094                                                 goto nomatch;
2095                                 break;
2096                         }
2097                 case TK_M_IMPORT_PROG:
2098                         {
2099                                 char import[UTIL_PATH_SIZE];
2100
2101                                 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2102                                 udev_event_apply_format(event, import, sizeof(import));
2103                                 if (import_program_into_properties(event->dev, import) != 0)
2104                                         if (cur->key.op != OP_NOMATCH)
2105                                                 goto nomatch;
2106                                 break;
2107                         }
2108                 case TK_M_IMPORT_PARENT:
2109                         {
2110                                 char import[UTIL_PATH_SIZE];
2111
2112                                 util_strlcpy(import, &rules->buf[cur->key.value_off], sizeof(import));
2113                                 udev_event_apply_format(event, import, sizeof(import));
2114                                 if (import_parent_into_properties(event->dev, import) != 0)
2115                                         if (cur->key.op != OP_NOMATCH)
2116                                                 goto nomatch;
2117                                 break;
2118                         }
2119                 case TK_M_RESULT:
2120                         if (match_key(rules, cur, event->program_result) != 0)
2121                                 goto nomatch;
2122                         break;
2123
2124                 case TK_A_IGNORE_DEVICE:
2125                         event->ignore_device = 1;
2126                         return 0;
2127                         break;
2128                 case TK_A_STRING_ESCAPE_NONE:
2129                         esc = ESCAPE_NONE;
2130                         break;
2131                 case TK_A_STRING_ESCAPE_REPLACE:
2132                         esc = ESCAPE_REPLACE;
2133                         break;
2134                 case TK_A_NUM_FAKE_PART:
2135                         if (strcmp(udev_device_get_subsystem(event->dev), "block") != 0)
2136                                 break;
2137                         if (udev_device_get_sysnum(event->dev) != NULL)
2138                                 break;
2139                         udev_device_set_num_fake_partitions(event->dev, cur->key.num_fake_part);
2140                         break;
2141                 case TK_A_DEVLINK_PRIO:
2142                         udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
2143                         break;
2144                 case TK_A_OWNER:
2145                         {
2146                                 char owner[UTIL_NAME_SIZE];
2147
2148                                 if (event->owner_final)
2149                                         break;
2150                                 if (cur->key.op == OP_ASSIGN_FINAL)
2151                                         event->owner_final = 1;
2152                                 util_strlcpy(owner,  &rules->buf[cur->key.value_off], sizeof(owner));
2153                                 udev_event_apply_format(event, owner, sizeof(owner));
2154                                 event->uid = util_lookup_user(event->udev, owner);
2155                                 info(event->udev, "OWNER %u %s:%u\n",
2156                                      event->uid,
2157                                      &rules->buf[rule->rule.filename_off],
2158                                      rule->rule.filename_line);
2159                                 break;
2160                         }
2161                 case TK_A_GROUP:
2162                         {
2163                                 char group[UTIL_NAME_SIZE];
2164
2165                                 if (event->group_final)
2166                                         break;
2167                                 if (cur->key.op == OP_ASSIGN_FINAL)
2168                                         event->group_final = 1;
2169                                 util_strlcpy(group, &rules->buf[cur->key.value_off], sizeof(group));
2170                                 udev_event_apply_format(event, group, sizeof(group));
2171                                 event->gid = util_lookup_group(event->udev, group);
2172                                 info(event->udev, "GROUP %u %s:%u\n",
2173                                      event->gid,
2174                                      &rules->buf[rule->rule.filename_off],
2175                                      rule->rule.filename_line);
2176                                 break;
2177                         }
2178                 case TK_A_MODE:
2179                         {
2180                                 char mode[UTIL_NAME_SIZE];
2181                                 char *endptr;
2182
2183                                 if (event->mode_final)
2184                                         break;
2185                                 if (cur->key.op == OP_ASSIGN_FINAL)
2186                                         event->mode_final = 1;
2187                                 util_strlcpy(mode, &rules->buf[cur->key.value_off], sizeof(mode));
2188                                 udev_event_apply_format(event, mode, sizeof(mode));
2189                                 event->mode = strtol(mode, &endptr, 8);
2190                                 if (endptr[0] != '\0') {
2191                                         err(event->udev, "invalide mode '%s' set default mode 0660\n", mode);
2192                                         event->mode = 0660;
2193                                 }
2194                                 info(event->udev, "MODE %#o %s:%u\n",
2195                                      event->mode,
2196                                      &rules->buf[rule->rule.filename_off],
2197                                      rule->rule.filename_line);
2198                                 break;
2199                         }
2200                 case TK_A_OWNER_ID:
2201                         if (event->owner_final)
2202                                 break;
2203                         if (cur->key.op == OP_ASSIGN_FINAL)
2204                                 event->owner_final = 1;
2205                         event->uid = cur->key.uid;
2206                         info(event->udev, "OWNER %u %s:%u\n",
2207                              event->uid,
2208                              &rules->buf[rule->rule.filename_off],
2209                              rule->rule.filename_line);
2210                         break;
2211                 case TK_A_GROUP_ID:
2212                         if (event->group_final)
2213                                 break;
2214                         if (cur->key.op == OP_ASSIGN_FINAL)
2215                                 event->group_final = 1;
2216                         event->gid = cur->key.gid;
2217                         info(event->udev, "GROUP %u %s:%u\n",
2218                              event->gid,
2219                              &rules->buf[rule->rule.filename_off],
2220                              rule->rule.filename_line);
2221                         break;
2222                 case TK_A_MODE_ID:
2223                         if (event->mode_final)
2224                                 break;
2225                         if (cur->key.op == OP_ASSIGN_FINAL)
2226                                 event->mode_final = 1;
2227                         event->mode = cur->key.mode;
2228                         info(event->udev, "MODE %#o %s:%u\n",
2229                              event->mode,
2230                              &rules->buf[rule->rule.filename_off],
2231                              rule->rule.filename_line);
2232                         break;
2233                 case TK_A_ENV:
2234                         {
2235                                 const char *name = &rules->buf[cur->key.attr_off];
2236                                 char *value = &rules->buf[cur->key.value_off];
2237
2238                                 if (value[0] != '\0') {
2239                                         char temp_value[UTIL_NAME_SIZE];
2240                                         struct udev_list_entry *entry;
2241
2242                                         util_strlcpy(temp_value, value, sizeof(temp_value));
2243                                         udev_event_apply_format(event, temp_value, sizeof(temp_value));
2244                                         entry = udev_device_add_property(event->dev, name, temp_value);
2245                                         /* store in db */
2246                                         udev_list_entry_set_flag(entry, 1);
2247                                 } else {
2248                                         udev_device_add_property(event->dev, name, NULL);
2249                                 }
2250                                 break;
2251                         }
2252                 case TK_A_NAME:
2253                         {
2254                                 const char *name  = &rules->buf[cur->key.value_off];
2255                                 char name_str[UTIL_PATH_SIZE];
2256                                 int count;
2257
2258                                 if (event->name_final)
2259                                         break;
2260                                 if (cur->key.op == OP_ASSIGN_FINAL)
2261                                         event->name_final = 1;
2262                                 if (name[0] == '\0') {
2263                                         free(event->name);
2264                                         event->name = NULL;
2265                                         break;
2266                                 }
2267                                 util_strlcpy(name_str, name, sizeof(name_str));
2268                                 udev_event_apply_format(event, name_str, sizeof(name_str));
2269                                 if (esc == ESCAPE_UNSET || esc == ESCAPE_REPLACE) {
2270                                         count = util_replace_chars(name_str, ALLOWED_CHARS_FILE);
2271                                         if (count > 0)
2272                                                 info(event->udev, "%i character(s) replaced\n", count);
2273                                         free(event->name);
2274                                         event->name = strdup(name_str);
2275                                         info(event->udev, "NAME '%s' %s:%u\n",
2276                                              event->name,
2277                                              &rules->buf[rule->rule.filename_off],
2278                                              rule->rule.filename_line);
2279                                 }
2280                                 break;
2281                         }
2282                 case TK_A_DEVLINK:
2283                         {
2284                                 char temp[UTIL_PATH_SIZE];
2285                                 char filename[UTIL_PATH_SIZE];
2286                                 char *pos, *next;
2287                                 int count = 0;
2288
2289                                 if (event->devlink_final)
2290                                         break;
2291                                 if (major(udev_device_get_devnum(event->dev)) == 0)
2292                                         break;
2293                                 if (cur->key.op == OP_ASSIGN_FINAL)
2294                                         event->devlink_final = 1;
2295                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2296                                         udev_device_cleanup_devlinks_list(event->dev);
2297
2298                                 /* allow  multiple symlinks separated by spaces */
2299                                 util_strlcpy(temp, &rules->buf[cur->key.value_off], sizeof(temp));
2300                                 udev_event_apply_format(event, temp, sizeof(temp));
2301                                 if (esc == ESCAPE_UNSET)
2302                                         count = util_replace_chars(temp, ALLOWED_CHARS_FILE " ");
2303                                 else if (esc == ESCAPE_REPLACE)
2304                                         count = util_replace_chars(temp, ALLOWED_CHARS_FILE);
2305                                 if (count > 0)
2306                                         info(event->udev, "%i character(s) replaced\n" , count);
2307                                 dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
2308                                 pos = temp;
2309                                 while (isspace(pos[0]))
2310                                         pos++;
2311                                 next = strchr(pos, ' ');
2312                                 while (next) {
2313                                         next[0] = '\0';
2314                                         info(event->udev, "LINK '%s' %s:%u\n",
2315                                              pos,
2316                                              &rules->buf[rule->rule.filename_off],
2317                                              rule->rule.filename_line);
2318                                         util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
2319                                         util_strlcat(filename, "/", sizeof(filename));
2320                                         util_strlcat(filename, pos, sizeof(filename));
2321                                         udev_device_add_devlink(event->dev, filename);
2322                                         while (isspace(next[1]))
2323                                                 next++;
2324                                         pos = &next[1];
2325                                         next = strchr(pos, ' ');
2326                                 }
2327                                 if (pos[0] != '\0') {
2328                                         info(event->udev, "LINK '%s' %s:%u\n",
2329                                              pos,
2330                                              &rules->buf[rule->rule.filename_off],
2331                                              rule->rule.filename_line);
2332                                         util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
2333                                         util_strlcat(filename, "/", sizeof(filename));
2334                                         util_strlcat(filename, pos, sizeof(filename));
2335                                         udev_device_add_devlink(event->dev, filename);
2336                                 }
2337                         }
2338                         break;
2339                 case TK_A_EVENT_TIMEOUT:
2340                         udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
2341                         break;
2342                 case TK_A_IGNORE_REMOVE:
2343                         udev_device_set_ignore_remove(event->dev, 1);
2344                         break;
2345                 case TK_A_ATTR:
2346                         {
2347                                 const char *key_name = &rules->buf[cur->key.attr_off];
2348                                 char attr[UTIL_PATH_SIZE];
2349                                 char value[UTIL_NAME_SIZE];
2350                                 FILE *f;
2351
2352                                 util_strlcpy(attr, key_name, sizeof(attr));
2353                                 if (util_resolve_subsys_kernel(event->udev, key_name, attr, sizeof(attr), 0) != 0) {
2354                                         util_strlcpy(attr, udev_device_get_syspath(event->dev), sizeof(attr));
2355                                         util_strlcat(attr, "/", sizeof(attr));
2356                                         util_strlcat(attr, key_name, sizeof(attr));
2357                                 }
2358
2359                                 attr_subst_subdir(attr, sizeof(attr));
2360
2361                                 util_strlcpy(value, &rules->buf[cur->key.value_off], sizeof(value));
2362                                 udev_event_apply_format(event, value, sizeof(value));
2363                                 info(event->udev, "ATTR '%s' writing '%s' %s:%u\n", attr, value,
2364                                      &rules->buf[rule->rule.filename_off],
2365                                      rule->rule.filename_line);
2366                                 f = fopen(attr, "w");
2367                                 if (f != NULL) {
2368                                         if (!event->test)
2369                                                 if (fprintf(f, "%s", value) <= 0)
2370                                                         err(event->udev, "error writing ATTR{%s}: %m\n", attr);
2371                                         fclose(f);
2372                                 } else {
2373                                         err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
2374                                 }
2375                                 break;
2376                         }
2377                 case TK_A_RUN:
2378                         {
2379                                 struct udev_list_entry *list_entry;
2380
2381                                 if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
2382                                         udev_list_cleanup_entries(event->udev, &event->run_list);
2383                                 info(event->udev, "RUN '%s' %s:%u\n",
2384                                      &rules->buf[cur->key.value_off],
2385                                      &rules->buf[rule->rule.filename_off],
2386                                      rule->rule.filename_line);
2387                                 list_entry = udev_list_entry_add(event->udev, &event->run_list,
2388                                                                  &rules->buf[cur->key.value_off], NULL, 1, 0);
2389                                 if (cur->key.ignore_error)
2390                                         udev_list_entry_set_flag(list_entry, 1);
2391                                 break;
2392                         }
2393                 case TK_A_GOTO:
2394                         cur = &rules->tokens[cur->key.rule_goto];
2395                         continue;
2396                 case TK_A_LAST_RULE:
2397                 case TK_END:
2398                         return 0;
2399
2400                 case TK_M_PARENTS_MIN:
2401                 case TK_M_PARENTS_MAX:
2402                 case TK_M_MAX:
2403                 case TK_UNSET:
2404                         err(rules->udev, "wrong type %u\n", cur->type);
2405                         goto nomatch;
2406                 }
2407
2408                 cur++;
2409                 continue;
2410         nomatch:
2411                 /* fast-forward to next rule */
2412                 idx = rule->rule.next_rule;
2413                 if (idx == 0)
2414                         return 0;
2415                 dbg(rules->udev, "forward to rule: %u\n", idx);
2416                 cur = &rules->tokens[idx];
2417         }
2418 }