udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
   8  *
   9  *
  10  *      This program is free software; you can redistribute it and/or modify it
  11  *      under the terms of the GNU General Public License as published by the
  12  *      Free Software Foundation version 2 of the License.
  13  *
  14  *      This program is distributed in the hope that it will be useful, but
  15  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *      General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License along
  20  *      with this program; if not, write to the Free Software Foundation, Inc.,
  21  *      675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  */
  24
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35
  36 #include "libsysfs/sysfs/libsysfs.h"
  37 #include "list.h"
  38 #include "udev_libc_wrapper.h"
  39 #include "udev.h"
  40 #include "udev_utils.h"
  41 #include "udev_version.h"
  42 #include "logging.h"
  43 #include "udev_rules.h"
  44 #include "udev_db.h"
  45
  46 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  47
  48 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  49 static int strcmp_pattern(const char *p, const char *s)
  50 {
  51         if (s[0] == '\0') {
  52                 while (p[0] == '*')
  53                         p++;
  54                 return (p[0] != '\0');
  55         }
  56         switch (p[0]) {
  57         case '[':
  58                 {
  59                         int not = 0;
  60                         p++;
  61                         if (p[0] == '!') {
  62                                 not = 1;
  63                                 p++;
  64                         }
  65                         while ((p[0] != '\0') && (p[0] != ']')) {
  66                                 int match = 0;
  67                                 if (p[1] == '-') {
  68                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  69                                                 match = 1;
  70                                         p += 3;
  71                                 } else {
  72                                         match = (p[0] == s[0]);
  73                                         p++;
  74                                 }
  75                                 if (match ^ not) {
  76                                         while ((p[0] != '\0') && (p[0] != ']'))
  77                                                 p++;
  78                                         if (p[0] == ']')
  79                                                 return strcmp_pattern(p+1, s+1);
  80                                 }
  81                         }
  82                 }
  83                 break;
  84         case '*':
  85                 if (strcmp_pattern(p, s+1))
  86                         return strcmp_pattern(p+1, s);
  87                 return 0;
  88         case '\0':
  89                 if (s[0] == '\0') {
  90                         return 0;
  91                 }
  92                 break;
  93         default:
  94                 if ((p[0] == s[0]) || (p[0] == '?'))
  95                         return strcmp_pattern(p+1, s+1);
  96                 break;
  97         }
  98         return 1;
  99 }
 100
 101 /* extract possible {attr} and move str behind it */
 102 static char *get_format_attribute(char **str)
 103 {
 104         char *pos;
 105         char *attr = NULL;
 106
 107         if (*str[0] == '{') {
 108                 pos = strchr(*str, '}');
 109                 if (pos == NULL) {
 110                         dbg("missing closing brace for format");
 111                         return NULL;
 112                 }
 113                 pos[0] = '\0';
 114                 attr = *str+1;
 115                 *str = pos+1;
 116                 dbg("attribute='%s', str='%s'", attr, *str);
 117         }
 118         return attr;
 119 }
 120
 121 /* extract possible format length and move str behind it*/
 122 static int get_format_len(char **str)
 123 {
 124         int num;
 125         char *tail;
 126
 127         if (isdigit(*str[0])) {
 128                 num = (int) strtoul(*str, &tail, 10);
 129                 if (num > 0) {
 130                         *str = tail;
 131                         dbg("format length=%i", num);
 132                         return num;
 133                 } else {
 134                         dbg("format parsing error '%s'", *str);
 135                 }
 136         }
 137         return -1;
 138 }
 139
 140 /** Finds the lowest positive N such that <name>N isn't present in
 141  *  $(udevroot) either as a file or a symlink.
 142  *
 143  *  @param  name                Name to check for
 144  *  @return                     0 if <name> didn't exist and N otherwise.
 145  */
 146 static int find_free_number(struct udevice *udev, const char *name)
 147 {
 148         char devpath[PATH_SIZE];
 149         char filename[PATH_SIZE];
 150         int num = 0;
 151
 152         strlcpy(filename, name, sizeof(filename));
 153         while (1) {
 154                 dbg("look for existing node '%s'", filename);
 155                 if (udev_db_search_name(devpath, sizeof(devpath), filename) != 0) {
 156                         dbg("free num=%d", num);
 157                         return num;
 158                 }
 159
 160                 num++;
 161                 if (num > 1000) {
 162                         info("find_free_number gone crazy (num=%d), aborted", num);
 163                         return -1;
 164                 }
 165                 snprintf(filename, sizeof(filename), "%s%d", name, num);
 166                 filename[sizeof(filename)-1] = '\0';
 167         }
 168 }
 169
 170 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 171                          struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 172 {
 173         char temp[PATH_SIZE];
 174         char temp2[PATH_SIZE];
 175         char *tail, *pos, *cpos, *attr, *rest;
 176         int len;
 177         int i;
 178         char c;
 179         struct sysfs_attribute *tmpattr;
 180         unsigned int next_free_number;
 181         struct sysfs_class_device *class_dev_parent;
 182
 183         pos = string;
 184         while (1) {
 185                 pos = strchr(pos, '%');
 186                 if (pos == NULL)
 187                         break;
 188
 189                 pos[0] = '\0';
 190                 tail = pos+1;
 191                 len = get_format_len(&tail);
 192                 c = tail[0];
 193                 strlcpy(temp, tail+1, sizeof(temp));
 194                 tail = temp;
 195                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 196                 attr = get_format_attribute(&tail);
 197
 198                 switch (c) {
 199                 case 'p':
 200                         strlcat(string, udev->devpath, maxsize);
 201                         dbg("substitute kernel name '%s'", udev->kernel_name);
 202                         break;
 203                 case 'b':
 204                         strlcat(string, udev->bus_id, maxsize);
 205                         dbg("substitute bus_id '%s'", udev->bus_id);
 206                         break;
 207                 case 'k':
 208                         strlcat(string, udev->kernel_name, maxsize);
 209                         dbg("substitute kernel name '%s'", udev->kernel_name);
 210                         break;
 211                 case 'n':
 212                         strlcat(string, udev->kernel_number, maxsize);
 213                         dbg("substitute kernel number '%s'", udev->kernel_number);
 214                                 break;
 215                 case 'm':
 216                         sprintf(temp2, "%d", minor(udev->devt));
 217                         strlcat(string, temp2, maxsize);
 218                         dbg("substitute minor number '%s'", temp2);
 219                         break;
 220                 case 'M':
 221                         sprintf(temp2, "%d", major(udev->devt));
 222                         strlcat(string, temp2, maxsize);
 223                         dbg("substitute major number '%s'", temp2);
 224                         break;
 225                 case 'c':
 226                         if (udev->program_result[0] == '\0')
 227                                 break;
 228                         /* get part part of the result string */
 229                         i = 0;
 230                         if (attr != NULL)
 231                                 i = strtoul(attr, &rest, 10);
 232                         if (i > 0) {
 233                                 dbg("request part #%d of result string", i);
 234                                 cpos = udev->program_result;
 235                                 while (--i) {
 236                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 237                                                 cpos++;
 238                                         while (isspace(cpos[0]))
 239                                                 cpos++;
 240                                 }
 241                                 if (i > 0) {
 242                                         dbg("requested part of result string not found");
 243                                         break;
 244                                 }
 245                                 strlcpy(temp2, cpos, sizeof(temp2));
 246                                 /* %{2+}c copies the whole string from the second part on */
 247                                 if (rest[0] != '+') {
 248                                         cpos = strchr(temp2, ' ');
 249                                         if (cpos)
 250                                                 cpos[0] = '\0';
 251                                 }
 252                                 strlcat(string, temp2, maxsize);
 253                                 dbg("substitute part of result string '%s'", temp2);
 254                         } else {
 255                                 strlcat(string, udev->program_result, maxsize);
 256                                 dbg("substitute result string '%s'", udev->program_result);
 257                         }
 258                         break;
 259                 case 's':
 260                         if (!class_dev)
 261                                 break;
 262                         if (attr == NULL) {
 263                                 dbg("missing attribute");
 264                                 break;
 265                         }
 266                         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 267                         if (tmpattr == NULL) {
 268                                 dbg("sysfa attribute '%s' not found", attr);
 269                                 break;
 270                         }
 271                         /* strip trailing whitespace of matching value */
 272                         if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 273                                 i = len = strlen(tmpattr->value);
 274                                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 275                                         i--;
 276                                 if (i < len) {
 277                                         tmpattr->value[i] = '\0';
 278                                         dbg("remove %i trailing whitespace chars from '%s'",
 279                                                  len - i, tmpattr->value);
 280                                 }
 281                         }
 282                         strlcat(string, tmpattr->value, maxsize);
 283                         dbg("substitute sysfs value '%s'", tmpattr->value);
 284                         break;
 285                 case '%':
 286                         strlcat(string, "%", maxsize);
 287                         pos++;
 288                         break;
 289                 case 'e':
 290                         next_free_number = find_free_number(udev, string);
 291                         if (next_free_number > 0) {
 292                                 sprintf(temp2, "%d", next_free_number);
 293                                 strlcat(string, temp2, maxsize);
 294                         }
 295                         break;
 296                 case 'P':
 297                         if (!class_dev)
 298                                 break;
 299                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 300                         if (class_dev_parent != NULL) {
 301                                 struct udevice udev_parent;
 302
 303                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 304                                 udev_init_device(&udev_parent, NULL, NULL);
 305                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 306                                 if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
 307                                         strlcat(string, udev_parent.name, maxsize);
 308                                         dbg("substitute parent node name'%s'", udev_parent.name);
 309                                 } else
 310                                         dbg("parent not found in database");
 311                                 udev_cleanup_device(&udev_parent);
 312                         }
 313                         break;
 314                 case 'N':
 315                         if (udev->tmp_node[0] == '\0') {
 316                                 dbg("create temporary device node for callout");
 317                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 318                                          udev_root, major(udev->devt), minor(udev->devt));
 319                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 320                                 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 321                         }
 322                         strlcat(string, udev->tmp_node, maxsize);
 323                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 324                         break;
 325                 case 'r':
 326                         strlcat(string, udev_root, maxsize);
 327                         dbg("substitute udev_root '%s'", udev_root);
 328                         break;
 329                 default:
 330                         dbg("unknown substitution type '%%%c'", c);
 331                         break;
 332                 }
 333                 /* truncate to specified length */
 334                 if (len > 0)
 335                         pos[len] = '\0';
 336
 337                 strlcat(string, tail, maxsize);
 338         }
 339 }
 340
 341 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
 342 {
 343         int retval;
 344         int count;
 345         int status;
 346         int fds[2];
 347         pid_t pid;
 348         char *pos;
 349         char arg[PATH_SIZE];
 350         char *argv[(sizeof(arg) / 2) + 1];
 351         int i;
 352
 353         strlcpy(arg, path, sizeof(arg));
 354         i = 0;
 355         if (strchr(path, ' ')) {
 356                 pos = arg;
 357                 while (pos != NULL) {
 358                         if (pos[0] == '\'') {
 359                                 /* don't separate if in apostrophes */
 360                                 pos++;
 361                                 argv[i] = strsep(&pos, "\'");
 362                                 while (pos && pos[0] == ' ')
 363                                         pos++;
 364                         } else {
 365                                 argv[i] = strsep(&pos, " ");
 366                         }
 367                         dbg("arg[%i] '%s'", i, argv[i]);
 368                         i++;
 369                 }
 370                 argv[i] =  NULL;
 371                 dbg("execute '%s' with parsed arguments", arg);
 372         } else {
 373                 argv[0] = arg;
 374                 argv[1] = udev->subsystem;
 375                 argv[2] = NULL;
 376                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 377         }
 378
 379         retval = pipe(fds);
 380         if (retval != 0) {
 381                 dbg("pipe failed");
 382                 return -1;
 383         }
 384
 385         pid = fork();
 386         switch(pid) {
 387         case 0:
 388                 /* child */
 389                 /* dup2 write side of pipe to STDOUT */
 390                 dup2(fds[1], STDOUT_FILENO);
 391                 retval = execv(arg, argv);
 392
 393                 info(KEY_PROGRAM " execution of '%s' failed", path);
 394                 exit(1);
 395         case -1:
 396                 dbg("fork failed");
 397                 return -1;
 398         default:
 399                 /* parent reads from fds[0] */
 400                 close(fds[1]);
 401                 retval = 0;
 402                 i = 0;
 403                 while (1) {
 404                         count = read(fds[0], value + i, len - i-1);
 405                         if (count <= 0)
 406                                 break;
 407
 408                         i += count;
 409                         if (i >= len-1) {
 410                                 dbg("result len %d too short", len);
 411                                 retval = -1;
 412                                 break;
 413                         }
 414                 }
 415
 416                 if (count < 0) {
 417                         dbg("read failed with '%s'", strerror(errno));
 418                         retval = -1;
 419                 }
 420
 421                 if (i > 0 && value[i-1] == '\n')
 422                         i--;
 423                 value[i] = '\0';
 424                 dbg("result is '%s'", value);
 425
 426                 close(fds[0]);
 427                 waitpid(pid, &status, 0);
 428
 429                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 430                         dbg("exec program status 0x%x", status);
 431                         retval = -1;
 432                 }
 433         }
 434         return retval;
 435 }
 436
 437 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 438 {
 439         struct sysfs_attribute *tmpattr = NULL;
 440         char *c;
 441
 442         dbg("look for device attribute '%s'", attr);
 443         /* try to find the attribute in the class device directory */
 444         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 445         if (tmpattr)
 446                 goto attr_found;
 447
 448         /* look in the class device directory if present */
 449         if (sysfs_device) {
 450                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 451                 if (tmpattr)
 452                         goto attr_found;
 453         }
 454
 455         return NULL;
 456
 457 attr_found:
 458         c = strchr(tmpattr->value, '\n');
 459         if (c != NULL)
 460                 c[0] = '\0';
 461
 462         dbg("found attribute '%s'", tmpattr->path);
 463         return tmpattr;
 464 }
 465
 466 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct key_pair *pair)
 467 {
 468         struct sysfs_attribute *tmpattr;
 469         int i;
 470         int len;
 471
 472         if ((pair == NULL) || (pair->name[0] == '\0') || (pair->value == '\0'))
 473                 return -ENODEV;
 474
 475         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->name);
 476         if (tmpattr == NULL)
 477                 return -ENODEV;
 478
 479         /* strip trailing whitespace of value, if not asked to match for it */
 480         if (! isspace(pair->value[strlen(pair->value)-1])) {
 481                 i = len = strlen(tmpattr->value);
 482                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 483                         i--;
 484                 if (i < len) {
 485                         tmpattr->value[i] = '\0';
 486                         dbg("remove %i trailing whitespace chars from '%s'",
 487                             len - i, tmpattr->value);
 488                 }
 489         }
 490
 491         dbg("compare attribute '%s' value '%s' with '%s'",
 492                   pair->name, tmpattr->value, pair->value);
 493         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 494                 return -ENODEV;
 495
 496         dbg("found matching attribute '%s' with value '%s'",
 497             pair->name, pair->value);
 498         return 0;
 499 }
 500
 501 static int match_id(struct udev_rule *rule, struct sysfs_device *sysfs_device)
 502 {
 503         char path[PATH_SIZE];
 504         char *temp;
 505
 506         strlcpy(path, sysfs_device->path, sizeof(path));
 507         temp = strrchr(path, '/');
 508         temp++;
 509         dbg("search '%s' in '%s', path='%s'", rule->id, temp, path);
 510         if (strcmp_pattern(rule->id, temp) != 0)
 511                 return -ENODEV;
 512
 513         return 0;
 514 }
 515
 516 static int match_rule(struct udevice *udev, struct udev_rule *rule,
 517                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 518 {
 519         if (rule->kernel[0] != '\0') {
 520                 dbg("check for " KEY_KERNEL " rule->kernel='%s' class_dev->name='%s'",
 521                     rule->kernel, class_dev->name);
 522                 if (strcmp_pattern(rule->kernel, class_dev->name) != 0) {
 523                         dbg(KEY_KERNEL " is not matching");
 524                         if (rule->kernel_operation != KEY_OP_NOMATCH)
 525                                 goto exit;
 526                 } else {
 527                         dbg(KEY_KERNEL " matches");
 528                         if (rule->kernel_operation == KEY_OP_NOMATCH)
 529                                 goto exit;
 530                 }
 531                 dbg(KEY_KERNEL " key is true");
 532         }
 533
 534         if (rule->subsystem[0] != '\0') {
 535                 dbg("check for " KEY_SUBSYSTEM " rule->subsystem='%s' class_dev->name='%s'",
 536                     rule->subsystem, class_dev->name);
 537                 if (strcmp_pattern(rule->subsystem, udev->subsystem) != 0) {
 538                         dbg(KEY_SUBSYSTEM " is not matching");
 539                         if (rule->subsystem_operation != KEY_OP_NOMATCH)
 540                                 goto exit;
 541                 } else {
 542                         dbg(KEY_SUBSYSTEM " matches");
 543                         if (rule->subsystem_operation == KEY_OP_NOMATCH)
 544                                 goto exit;
 545                 }
 546                 dbg(KEY_SUBSYSTEM " key is true");
 547         }
 548
 549         if (rule->env_pair_count) {
 550                 int i;
 551
 552                 dbg("check for " KEY_ENV " pairs");
 553                 for (i = 0; i < rule->env_pair_count; i++) {
 554                         struct key_pair *pair;
 555                         const char *value;
 556
 557                         pair = &rule->env_pair[i];
 558                         value = getenv(pair->name);
 559                         if (!value) {
 560                                 dbg(KEY_ENV "{'%s'} is not found", pair->name);
 561                                 goto exit;
 562                         }
 563                         if (strcmp_pattern(pair->value, value) != 0) {
 564                                 dbg(KEY_ENV "{'%s'} is not matching", pair->name);
 565                                 if (pair->operation != KEY_OP_NOMATCH)
 566                                         goto exit;
 567                         } else {
 568                                 dbg(KEY_ENV "{'%s'} matches", pair->name);
 569                                 if (pair->operation == KEY_OP_NOMATCH)
 570                                         goto exit;
 571                         }
 572                 }
 573                 dbg(KEY_ENV " key is true");
 574         }
 575
 576         /* walk up the chain of physical devices and find a match */
 577         while (1) {
 578                 /* check for matching driver */
 579                 if (rule->driver[0] != '\0') {
 580                         if (sysfs_device == NULL) {
 581                                 dbg("device has no sysfs_device");
 582                                 goto try_parent;
 583                         }
 584                         dbg("check for " KEY_DRIVER " rule->driver='%s' sysfs_device->driver_name='%s'",
 585                             rule->driver, sysfs_device->driver_name);
 586                         if (strcmp_pattern(rule->driver, sysfs_device->driver_name) != 0) {
 587                                 dbg(KEY_DRIVER " is not matching");
 588                                 if (rule->driver_operation != KEY_OP_NOMATCH)
 589                                         goto try_parent;
 590                         } else {
 591                                 dbg(KEY_DRIVER " matches");
 592                                 if (rule->driver_operation == KEY_OP_NOMATCH)
 593                                         goto try_parent;
 594                         }
 595                         dbg(KEY_DRIVER " key is true");
 596                 }
 597
 598                 /* check for matching bus value */
 599                 if (rule->bus[0] != '\0') {
 600                         if (sysfs_device == NULL) {
 601                                 dbg("device has no sysfs_device");
 602                                 goto try_parent;
 603                         }
 604                         dbg("check for " KEY_BUS " rule->bus='%s' sysfs_device->bus='%s'",
 605                             rule->bus, sysfs_device->bus);
 606                         if (strcmp_pattern(rule->bus, sysfs_device->bus) != 0) {
 607                                 dbg(KEY_BUS " is not matching");
 608                                 if (rule->bus_operation != KEY_OP_NOMATCH)
 609                                         goto try_parent;
 610                         } else {
 611                                 dbg(KEY_BUS " matches");
 612                                 if (rule->bus_operation == KEY_OP_NOMATCH)
 613                                         goto try_parent;
 614                         }
 615                         dbg(KEY_BUS " key is true");
 616                 }
 617
 618                 /* check for matching bus id */
 619                 if (rule->id[0] != '\0') {
 620                         if (sysfs_device == NULL) {
 621                                 dbg("device has no sysfs_device");
 622                                 goto try_parent;
 623                         }
 624                         dbg("check " KEY_ID);
 625                         if (match_id(rule, sysfs_device) != 0) {
 626                                 dbg(KEY_ID " is not matching");
 627                                 if (rule->id_operation != KEY_OP_NOMATCH)
 628                                         goto try_parent;
 629                         } else {
 630                                 dbg(KEY_ID " matches");
 631                                 if (rule->id_operation == KEY_OP_NOMATCH)
 632                                         goto try_parent;
 633                         }
 634                         dbg(KEY_ID " key is true");
 635                 }
 636
 637                 /* check for matching sysfs pairs */
 638                 if (rule->sysfs_pair_count) {
 639                         int i;
 640
 641                         dbg("check " KEY_SYSFS " pairs");
 642                         for (i = 0; i < rule->sysfs_pair_count; i++) {
 643                                 struct key_pair *pair;
 644
 645                                 pair = &rule->sysfs_pair[i];
 646                                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 647                                         dbg(KEY_SYSFS "{'%s'} is not matching", pair->name);
 648                                         if (pair->operation != KEY_OP_NOMATCH)
 649                                                 goto try_parent;
 650                                 } else {
 651                                         dbg(KEY_SYSFS "{'%s'} matches", pair->name);
 652                                         if (pair->operation == KEY_OP_NOMATCH)
 653                                                 goto try_parent;
 654                                 }
 655                         }
 656                         dbg(KEY_SYSFS " keys are true");
 657                 }
 658
 659                 /* found matching physical device  */
 660                 break;
 661 try_parent:
 662                 dbg("try parent sysfs device");
 663                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 664                 if (sysfs_device == NULL)
 665                         goto exit;
 666                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 667                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 668         }
 669
 670         /* execute external program */
 671         if (rule->program[0] != '\0') {
 672                 char program[PATH_SIZE];
 673
 674                 dbg("check " KEY_PROGRAM);
 675                 strlcpy(program, rule->program, sizeof(program));
 676                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 677                 if (execute_program(udev, program, udev->program_result, sizeof(udev->program_result)) != 0) {
 678                         dbg(KEY_PROGRAM " returned nonzero");
 679                         if (rule->program_operation != KEY_OP_NOMATCH)
 680                                 goto exit;
 681                 } else {
 682                         dbg(KEY_PROGRAM " returned successful");
 683                         if (rule->program_operation == KEY_OP_NOMATCH)
 684                                 goto exit;
 685                 }
 686                 dbg(KEY_PROGRAM " key is true");
 687         }
 688
 689         /* check for matching result of external program */
 690         if (rule->result[0] != '\0') {
 691                 dbg("check for " KEY_RESULT " rule->result='%s', udev->program_result='%s'",
 692                    rule->result, udev->program_result);
 693                 if (strcmp_pattern(rule->result, udev->program_result) != 0) {
 694                         dbg(KEY_RESULT " is not matching");
 695                         if (rule->result_operation != KEY_OP_NOMATCH)
 696                                 goto exit;
 697                 } else {
 698                         dbg(KEY_RESULT " matches");
 699                         if (rule->result_operation == KEY_OP_NOMATCH)
 700                                 goto exit;
 701                 }
 702                 dbg(KEY_RESULT " key is true");
 703         }
 704
 705         /* rule matches */
 706         return 0;
 707
 708 exit:
 709         return -1;
 710 }
 711
 712 int udev_rules_get_name(struct udevice *udev, struct sysfs_class_device *class_dev)
 713 {
 714         struct sysfs_class_device *class_dev_parent;
 715         struct sysfs_device *sysfs_device = NULL;
 716         struct udev_rule *rule;
 717
 718         dbg("class_dev->name='%s'", class_dev->name);
 719
 720         /* Figure out where the "device"-symlink is at.  For char devices this will
 721          * always be in the class_dev->path.  On block devices, only the main block
 722          * device will have the device symlink in it's path. All partition devices
 723          * need to look at the symlink in its parent directory.
 724          */
 725         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 726         if (class_dev_parent != NULL) {
 727                 dbg("given class device has a parent, use this instead");
 728                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 729         } else {
 730                 sysfs_device = sysfs_get_classdev_device(class_dev);
 731         }
 732
 733         if (sysfs_device) {
 734                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 735                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 736                 strlcpy(udev->bus_id, sysfs_device->bus_id, sizeof(udev->bus_id));
 737         }
 738
 739         dbg("udev->kernel_name='%s'", udev->kernel_name);
 740
 741         /* look for a matching rule to apply */
 742         list_for_each_entry(rule, &udev_rule_list, node) {
 743                 dbg("process rule");
 744                 if (match_rule(udev, rule, class_dev, sysfs_device) == 0) {
 745
 746                         /* apply options */
 747                         if (rule->ignore_device) {
 748                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 749                                      rule->config_file, rule->config_line, udev->kernel_name);
 750                                 return -1;
 751                         }
 752                         if (rule->ignore_remove) {
 753                                 udev->ignore_remove = 1;
 754                                 dbg("remove event should be ignored");
 755                         }
 756                         /* apply all_partitions option only at a main block device */
 757                         if (rule->partitions && udev->type == DEV_BLOCK && udev->kernel_number[0] == '\0') {
 758                                 udev->partitions = rule->partitions;
 759                                 dbg("creation of partition nodes requested");
 760                         }
 761
 762                         /* apply permissions */
 763                         if (rule->mode != 0000) {
 764                                 udev->mode = rule->mode;
 765                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
 766                         }
 767                         if (rule->owner[0] != '\0') {
 768                                 strlcpy(udev->owner, rule->owner, sizeof(udev->owner));
 769                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 770                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 771                         }
 772                         if (rule->group[0] != '\0') {
 773                                 strlcpy(udev->group, rule->group, sizeof(udev->group));
 774                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 775                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 776                         }
 777
 778                         /* collect symlinks */
 779                         if (rule->symlink[0] != '\0') {
 780                                 char temp[PATH_SIZE];
 781                                 char *pos, *next;
 782
 783                                 info("configured rule in '%s[%i]' applied, added symlink '%s'",
 784                                      rule->config_file, rule->config_line, rule->symlink);
 785                                 strlcpy(temp, rule->symlink, sizeof(temp));
 786                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 787
 788                                 /* add multiple symlinks separated by spaces */
 789                                 pos = temp;
 790                                 next = strchr(temp, ' ');
 791                                 while (next) {
 792                                         next[0] = '\0';
 793                                         dbg("add symlink '%s'", pos);
 794                                         name_list_add(&udev->symlink_list, pos, 0);
 795                                         pos = &next[1];
 796                                         next = strchr(pos, ' ');
 797                                 }
 798                                 dbg("add symlink '%s'", pos);
 799                                 name_list_add(&udev->symlink_list, pos, 0);
 800                         }
 801
 802                         /* rule matches */
 803                         if (rule->name[0] != '\0') {
 804                                 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
 805                                      rule->config_file, rule->config_line, udev->kernel_name, rule->name);
 806
 807                                 strlcpy(udev->name, rule->name, sizeof(udev->name));
 808                                 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 809                                 strlcpy(udev->config_file, rule->config_file, sizeof(udev->config_file));
 810                                 udev->config_line = rule->config_line;
 811
 812                                 if (udev->type != DEV_NET)
 813                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 814                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 815
 816                                 break;
 817                         }
 818
 819                         if (rule->last_rule) {
 820                                 dbg("last rule to be applied");
 821                                 break;
 822                         }
 823
 824                 }
 825         }
 826
 827         if (udev->name[0] == '\0') {
 828                 /* no rule matched, so we use the kernel name */
 829                 strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
 830                 dbg("no rule found, use kernel name '%s'", udev->name);
 831         }
 832
 833         if (udev->tmp_node[0] != '\0') {
 834                 dbg("removing temporary device node");
 835                 unlink_secure(udev->tmp_node);
 836                 udev->tmp_node[0] = '\0';
 837         }
 838
 839         return 0;
 840 }