namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <sys/wait.h>
  33 #include <sys/stat.h>
  34
  35 #include "libsysfs/sysfs/libsysfs.h"
  36 #include "list.h"
  37 #include "udev.h"
  38 #include "udev_utils.h"
  39 #include "udev_version.h"
  40 #include "logging.h"
  41 #include "namedev.h"
  42 #include "udev_db.h"
  43
  44 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  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                         dbg("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                         dbg("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 filename[NAME_SIZE];
 147         int num = 0;
 148         struct udevice db_udev;
 149
 150         strfieldcpy(filename, name);
 151         while (1) {
 152                 dbg("look for existing node '%s'", filename);
 153                 memset(&db_udev, 0x00, sizeof(struct udevice));
 154                 if (udev_db_get_device_byname(&db_udev, 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, NAME_SIZE, "%s%d", name, num);
 165                 filename[NAME_SIZE-1] = '\0';
 166         }
 167 }
 168
 169 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 170                          struct sysfs_class_device *class_dev,
 171                          struct sysfs_device *sysfs_device)
 172 {
 173         char temp[NAME_SIZE];
 174         char temp2[NAME_SIZE];
 175         char *tail;
 176         char *pos;
 177         char *attr;
 178         int len;
 179         int i;
 180         char c;
 181         char *spos;
 182         char *rest;
 183         int slen;
 184         struct sysfs_attribute *tmpattr;
 185         unsigned int next_free_number;
 186         struct sysfs_class_device *class_dev_parent;
 187
 188         pos = string;
 189         while (1) {
 190                 pos = strchr(pos, '%');
 191                 if (pos == NULL)
 192                         break;
 193
 194                 pos[0] = '\0';
 195                 tail = pos+1;
 196                 len = get_format_len(&tail);
 197                 c = tail[0];
 198                 strfieldcpy(temp, tail+1);
 199                 tail = temp;
 200                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 201                 attr = get_format_attribute(&tail);
 202
 203
 204                 switch (c) {
 205                 case 'p':
 206                         if (strlen(udev->devpath) == 0)
 207                                 break;
 208                         strfieldcatmax(string, udev->devpath, maxsize);
 209                         dbg("substitute kernel name '%s'", udev->kernel_name);
 210                         break;
 211                 case 'b':
 212                         if (strlen(udev->bus_id) == 0)
 213                                 break;
 214                         strfieldcatmax(string, udev->bus_id, maxsize);
 215                         dbg("substitute bus_id '%s'", udev->bus_id);
 216                         break;
 217                 case 'k':
 218                         if (strlen(udev->kernel_name) == 0)
 219                                 break;
 220                         strfieldcatmax(string, udev->kernel_name, maxsize);
 221                         dbg("substitute kernel name '%s'", udev->kernel_name);
 222                         break;
 223                 case 'n':
 224                         if (strlen(udev->kernel_number) == 0)
 225                                 break;
 226                         strfieldcatmax(string, udev->kernel_number, maxsize);
 227                         dbg("substitute kernel number '%s'", udev->kernel_number);
 228                                 break;
 229                 case 'm':
 230                         strintcatmax(string, udev->minor, maxsize);
 231                         dbg("substitute minor number '%u'", udev->minor);
 232                         break;
 233                 case 'M':
 234                         strintcatmax(string, udev->major, maxsize);
 235                         dbg("substitute major number '%u'", udev->major);
 236                         break;
 237                 case 'c':
 238                         if (strlen(udev->program_result) == 0)
 239                                 break;
 240                         /* get part part of the result string */
 241                         i = 0;
 242                         if (attr != NULL)
 243                                 i = strtoul(attr, &rest, 10);
 244                         if (i > 0) {
 245                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 246                                         i--;
 247                                         if (i == 0)
 248                                                 break;
 249                                 }
 250                                 if (i > 0) {
 251                                         dbg("requested part of result string not found");
 252                                         break;
 253                                 }
 254                                 if (rest[0] == '+')
 255                                         strfieldcpy(temp2, spos);
 256                                 else
 257                                         strfieldcpymax(temp2, spos, slen+1);
 258                                 strfieldcatmax(string, temp2, maxsize);
 259                                 dbg("substitute part of result string '%s'", temp2);
 260                         } else {
 261                                 strfieldcatmax(string, udev->program_result, maxsize);
 262                                 dbg("substitute result string '%s'", udev->program_result);
 263                         }
 264                         break;
 265                 case 's':
 266                         if (attr != NULL) {
 267                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 268                                 if (tmpattr == NULL) {
 269                                         dbg("sysfa attribute '%s' not found", attr);
 270                                         break;
 271                                 }
 272                                 /* strip trailing whitespace of matching value */
 273                                 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 274                                         i = len = strlen(tmpattr->value);
 275                                         while (i > 0 &&  isspace(tmpattr->value[i-1]))
 276                                                 i--;
 277                                         if (i < len) {
 278                                                 tmpattr->value[i] = '\0';
 279                                                 dbg("remove %i trailing whitespace chars from '%s'",
 280                                                          len - i, tmpattr->value);
 281                                         }
 282                                 }
 283                                 strfieldcatmax(string, tmpattr->value, maxsize);
 284                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 285                         } else {
 286                                 dbg("missing attribute");
 287                         }
 288                         break;
 289                 case '%':
 290                         strfieldcatmax(string, "%", maxsize);
 291                         pos++;
 292                         break;
 293                 case 'e':
 294                         next_free_number = find_free_number(udev, string);
 295                         if (next_free_number > 0) {
 296                                 sprintf(temp2, "%d", next_free_number);
 297                                 strfieldcatmax(string, temp2, maxsize);
 298                         }
 299                         break;
 300                 case 'P':
 301                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 302                         if (class_dev_parent != NULL) {
 303                                 struct udevice udev_parent;
 304
 305                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 306                                 memset(&udev_parent, 0x00, sizeof(struct udevice));
 307                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 308                                 strfieldcpy(udev_parent.devpath, &class_dev_parent->path[strlen(sysfs_path)]);
 309                                 if (udev_db_get_device(&udev_parent) == 0) {
 310                                         strfieldcatmax(string, udev_parent.name, maxsize);
 311                                         dbg("substitute parent node name'%s'", udev_parent.name);
 312                                 } else
 313                                         dbg("parent not found in database");
 314                         }
 315                         break;
 316                 case 'N':
 317                         if (udev->tmp_node[0] == '\0') {
 318                                 dbg("create temporary device node for callout");
 319                                 snprintf(udev->tmp_node, NAME_SIZE-1, "%s/.tmp-%u-%u", udev_root, udev->major, udev->minor);
 320                                 udev_make_node(udev, udev->tmp_node, udev->major, udev->minor, 0600, 0, 0);
 321                         }
 322                         strfieldcatmax(string, udev->tmp_node, maxsize);
 323                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 324                         break;
 325                 case 'r':
 326                         strfieldcatmax(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                 strfieldcatmax(string, tail, maxsize);
 338         }
 339 }
 340
 341 static void fix_kernel_name(struct udevice *udev)
 342 {
 343         char *temp = udev->kernel_name;
 344
 345         while (*temp != 0x00) {
 346                 /* Some block devices have a ! in their name,
 347                  * we need to change that to / */
 348                 if (*temp == '!')
 349                         *temp = '/';
 350                 ++temp;
 351         }
 352 }
 353
 354 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
 355 {
 356         int retval;
 357         int count;
 358         int status;
 359         int fds[2];
 360         pid_t pid;
 361         char *pos;
 362         char arg[PROGRAM_SIZE];
 363         char *argv[(PROGRAM_SIZE / 2) + 1];
 364         int i;
 365
 366         strfieldcpy(arg, path);
 367         i = 0;
 368         if (strchr(path, ' ')) {
 369                 pos = arg;
 370                 while (pos != NULL) {
 371                         if (pos[0] == '\'') {
 372                                 /* don't separate if in apostrophes */
 373                                 pos++;
 374                                 argv[i] = strsep(&pos, "\'");
 375                                 while (pos && pos[0] == ' ')
 376                                         pos++;
 377                         } else {
 378                                 argv[i] = strsep(&pos, " ");
 379                         }
 380                         dbg("arg[%i] '%s'", i, argv[i]);
 381                         i++;
 382                 }
 383                 argv[i] =  NULL;
 384                 dbg("execute '%s' with parsed arguments", arg);
 385         } else {
 386                 argv[0] = arg;
 387                 argv[1] = udev->subsystem;
 388                 argv[2] = NULL;
 389                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 390         }
 391
 392         retval = pipe(fds);
 393         if (retval != 0) {
 394                 dbg("pipe failed");
 395                 return -1;
 396         }
 397
 398         pid = fork();
 399         switch(pid) {
 400         case 0:
 401                 /* child */
 402                 /* dup2 write side of pipe to STDOUT */
 403                 dup2(fds[1], STDOUT_FILENO);
 404                 retval = execv(arg, argv);
 405
 406                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 407                 exit(1);
 408         case -1:
 409                 dbg("fork failed");
 410                 return -1;
 411         default:
 412                 /* parent reads from fds[0] */
 413                 close(fds[1]);
 414                 retval = 0;
 415                 i = 0;
 416                 while (1) {
 417                         count = read(fds[0], value + i, len - i-1);
 418                         if (count <= 0)
 419                                 break;
 420
 421                         i += count;
 422                         if (i >= len-1) {
 423                                 dbg("result len %d too short", len);
 424                                 retval = -1;
 425                                 break;
 426                         }
 427                 }
 428
 429                 if (count < 0) {
 430                         dbg("read failed with '%s'", strerror(errno));
 431                         retval = -1;
 432                 }
 433
 434                 if (i > 0 && value[i-1] == '\n')
 435                         i--;
 436                 value[i] = '\0';
 437                 dbg("result is '%s'", value);
 438
 439                 close(fds[0]);
 440                 waitpid(pid, &status, 0);
 441
 442                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 443                         dbg("exec program status 0x%x", status);
 444                         retval = -1;
 445                 }
 446         }
 447         return retval;
 448 }
 449
 450 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 451 {
 452         struct sysfs_attribute *tmpattr = NULL;
 453         char *c;
 454
 455         dbg("look for device attribute '%s'", attr);
 456         /* try to find the attribute in the class device directory */
 457         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 458         if (tmpattr)
 459                 goto attr_found;
 460
 461         /* look in the class device directory if present */
 462         if (sysfs_device) {
 463                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 464                 if (tmpattr)
 465                         goto attr_found;
 466         }
 467
 468         return NULL;
 469
 470 attr_found:
 471         c = strchr(tmpattr->value, '\n');
 472         if (c != NULL)
 473                 c[0] = '\0';
 474
 475         dbg("found attribute '%s'", tmpattr->path);
 476         return tmpattr;
 477 }
 478
 479 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 480 {
 481         struct sysfs_attribute *tmpattr;
 482         int i;
 483         int len;
 484
 485         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 486                 return -ENODEV;
 487
 488         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 489         if (tmpattr == NULL)
 490                 return -ENODEV;
 491
 492         /* strip trailing whitespace of value, if not asked to match for it */
 493         if (! isspace(pair->value[strlen(pair->value)-1])) {
 494                 i = len = strlen(tmpattr->value);
 495                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 496                         i--;
 497                 if (i < len) {
 498                         tmpattr->value[i] = '\0';
 499                         dbg("remove %i trailing whitespace chars from '%s'",
 500                             len - i, tmpattr->value);
 501                 }
 502         }
 503
 504         dbg("compare attribute '%s' value '%s' with '%s'",
 505                   pair->file, tmpattr->value, pair->value);
 506         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 507                 return -ENODEV;
 508
 509         dbg("found matching attribute '%s' with value '%s'",
 510             pair->file, pair->value);
 511         return 0;
 512 }
 513
 514 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 515 {
 516         struct sysfs_pair *pair;
 517         int i;
 518
 519         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 520                 pair = &dev->sysfs_pair[i];
 521                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 522                         break;
 523                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 524                         dbg("sysfs attribute doesn't match");
 525                         return -ENODEV;
 526                 }
 527         }
 528
 529         return 0;
 530 }
 531
 532 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 533 {
 534         char path[SYSFS_PATH_MAX];
 535         char *temp = NULL;
 536
 537         /* we have to have a sysfs device for ID to work */
 538         if (!sysfs_device)
 539                 return -ENODEV;
 540
 541         strfieldcpy(path, sysfs_device->path);
 542         temp = strrchr(path, '/');
 543         temp++;
 544         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 545         if (strcmp_pattern(dev->id, temp) != 0)
 546                 return -ENODEV;
 547         else
 548                 return 0;
 549 }
 550
 551 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 552 {
 553         char path[SYSFS_PATH_MAX];
 554         int found;
 555         char *temp = NULL;
 556
 557         /* we have to have a sysfs device for PLACE to work */
 558         if (!sysfs_device)
 559                 return -ENODEV;
 560
 561         found = 0;
 562         strfieldcpy(path, sysfs_device->path);
 563         temp = strrchr(path, '/');
 564         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 565         if (strstr(temp, dev->place) != NULL) {
 566                 found = 1;
 567         } else {
 568                 *temp = 0x00;
 569                 temp = strrchr(path, '/');
 570                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 571                 if (strstr(temp, dev->place) != NULL)
 572                         found = 1;
 573         }
 574         if (!found) {
 575                 dbg("place doesn't match");
 576                 return -ENODEV;
 577         }
 578
 579         return 0;
 580 }
 581
 582 static int match_rule(struct udevice *udev, struct config_device *dev,
 583                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 584 {
 585         while (1) {
 586                 /* check for matching kernel name */
 587                 if (dev->kernel[0] != '\0') {
 588                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'",
 589                             dev->kernel, class_dev->name);
 590                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 591                                 dbg(FIELD_KERNEL " is not matching");
 592                                 goto exit;
 593                         }
 594                         dbg(FIELD_KERNEL " matches");
 595                 }
 596
 597                 /* check for matching subsystem */
 598                 if (dev->subsystem[0] != '\0') {
 599                         dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'",
 600                             dev->subsystem, class_dev->name);
 601                         if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) {
 602                                 dbg(FIELD_SUBSYSTEM " is not matching");
 603                                 goto exit;
 604                         }
 605                         dbg(FIELD_SUBSYSTEM " matches");
 606                 }
 607
 608                 /* check for matching driver */
 609                 if (dev->driver[0] != '\0') {
 610                         dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'",
 611                             dev->driver, sysfs_device->driver_name);
 612                         if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) {
 613                                 dbg(FIELD_DRIVER " is not matching");
 614                                 goto try_parent;
 615                         } else {
 616                                 dbg(FIELD_DRIVER " matches");
 617                         }
 618                 }
 619
 620                 /* check for matching bus value */
 621                 if (dev->bus[0] != '\0') {
 622                         if (sysfs_device == NULL) {
 623                                 dbg("device has no bus");
 624                                 goto try_parent;
 625                         }
 626                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'",
 627                             dev->bus, sysfs_device->bus);
 628                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 629                                 dbg(FIELD_BUS " is not matching");
 630                                 goto try_parent;
 631                         }
 632                         dbg(FIELD_BUS " matches");
 633                 }
 634
 635                 /* check for matching bus id */
 636                 if (dev->id[0] != '\0') {
 637                         dbg("check " FIELD_ID);
 638                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 639                                 dbg(FIELD_ID " is not matching");
 640                                 goto try_parent;
 641                         } else {
 642                                 dbg(FIELD_ID " matches");
 643                         }
 644                 }
 645
 646                 /* check for matching place of device */
 647                 if (dev->place[0] != '\0') {
 648                         dbg("check " FIELD_PLACE);
 649                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 650                                 dbg(FIELD_PLACE " is not matching");
 651                                 goto try_parent;
 652                         } else {
 653                                 dbg(FIELD_PLACE " matches");
 654                         }
 655                 }
 656
 657                 /* check for matching sysfs pairs */
 658                 if (dev->sysfs_pair[0].file[0] != '\0') {
 659                         dbg("check " FIELD_SYSFS " pairs");
 660                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 661                                 dbg(FIELD_SYSFS " is not matching");
 662                                 goto try_parent;
 663                         } else {
 664                                 dbg(FIELD_SYSFS " matches");
 665                         }
 666                 }
 667
 668                 /* execute external program */
 669                 if (dev->program[0] != '\0') {
 670                         char program[PROGRAM_SIZE];
 671
 672                         dbg("check " FIELD_PROGRAM);
 673                         strfieldcpy(program, dev->program);
 674                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 675                         if (execute_program(udev, program, udev->program_result, NAME_SIZE) != 0) {
 676                                 dbg(FIELD_PROGRAM " returned nonzero");
 677                                 goto try_parent;
 678                         } else {
 679                                 dbg(FIELD_PROGRAM " returned successful");
 680                         }
 681                 }
 682
 683                 /* check for matching result of external program */
 684                 if (dev->result[0] != '\0') {
 685                         dbg("check for " FIELD_RESULT " dev->result='%s', udev->program_result='%s'",
 686                             dev->result, udev->program_result);
 687                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 688                                 dbg(FIELD_RESULT " is not matching");
 689                                 goto try_parent;
 690                         } else {
 691                                 dbg(FIELD_RESULT " matches");
 692                         }
 693                 }
 694
 695                 /* we matched */
 696                 return 0;
 697
 698 try_parent:
 699                 dbg("try parent sysfs device");
 700                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 701                 if (sysfs_device == NULL)
 702                         goto exit;
 703                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 704                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 705         }
 706
 707 exit:
 708         return -1;
 709 }
 710
 711 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
 712 {
 713         struct sysfs_class_device *class_dev_parent;
 714         struct sysfs_device *sysfs_device = NULL;
 715         struct config_device *dev;
 716         char *pos;
 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                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 737         }
 738
 739         strfieldcpy(udev->kernel_name, class_dev->name);
 740         fix_kernel_name(udev);
 741         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 742
 743         /* get kernel number */
 744         pos = class_dev->name + strlen(class_dev->name);
 745         while (isdigit(*(pos-1)))
 746                 pos--;
 747         strfieldcpy(udev->kernel_number, pos);
 748         dbg("kernel_number='%s'", udev->kernel_number);
 749
 750         /* look for a matching rule to apply */
 751         list_for_each_entry(dev, &config_device_list, node) {
 752                 dbg("process rule");
 753                 if (match_rule(udev, dev, class_dev, sysfs_device) == 0) {
 754
 755                         /* empty name, symlink and perms will not create any node */
 756                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0' &&
 757                             dev->mode == 0000 && dev->owner[0] == '\0' && dev->group[0] == '\0') {
 758                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 759                                      dev->config_file, dev->config_line, udev->kernel_name);
 760                                 return -1;
 761                         }
 762
 763                         /* apply permissions */
 764                         if (dev->mode != 0000) {
 765                                 udev->mode = dev->mode;
 766                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
 767                         }
 768                         if (dev->owner[0] != '\0') {
 769                                 strfieldcpy(udev->owner, dev->owner);
 770                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 771                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 772                         }
 773                         if (dev->group[0] != '\0') {
 774                                 strfieldcpy(udev->group, dev->group);
 775                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 776                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 777                         }
 778
 779                         /* collect symlinks for this or the final matching rule */
 780                         if (dev->symlink[0] != '\0') {
 781                                 char temp[NAME_SIZE];
 782
 783                                 info("configured rule in '%s[%i]' applied, added symlink '%s'",
 784                                      dev->config_file, dev->config_line, dev->symlink);
 785                                 strfieldcpy(temp, dev->symlink);
 786                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 787                                 if (udev->symlink[0] != '\0')
 788                                         strfieldcat(udev->symlink, " ");
 789                                 strfieldcat(udev->symlink, temp);
 790                         }
 791
 792                         /* rule matches */
 793                         if (dev->name[0] != '\0') {
 794                                 /* apply all_partitions flag only at a main block device */
 795                                 if (dev->partitions > 0 &&
 796                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 797                                         continue;
 798
 799                                 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
 800                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 801
 802                                 strfieldcpy(udev->name, dev->name);
 803                                 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 804                                 strfieldcpy(udev->config_file, dev->config_file);
 805                                 udev->config_line = dev->config_line;
 806                                 udev->ignore_remove = dev->ignore_remove;
 807
 808                                 if (udev->type == 'n')
 809                                         goto exit;
 810
 811                                 udev->partitions = dev->partitions;
 812
 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                                 goto exit;
 817                         }
 818                 }
 819         }
 820
 821         /* no rule matched, so we use the kernel name */
 822         strfieldcpy(udev->name, udev->kernel_name);
 823         dbg("no rule found, use kernel name '%s'", udev->name);
 824
 825 exit:
 826         if (udev->tmp_node[0] != '\0') {
 827                 dbg("removing temporary device node");
 828                 unlink_secure(udev->tmp_node);
 829                 udev->tmp_node[0] = '\0';
 830         }
 831
 832         return 0;
 833 }