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