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