namedev.c

   1 /*
   2  * namedev.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.h"
  39 #include "udev_utils.h"
  40 #include "udev_version.h"
  41 #include "logging.h"
  42 #include "namedev.h"
  43 #include "udev_db.h"
  44
  45 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  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                         dbg("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                         dbg("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 filename[NAME_SIZE];
 148         int num = 0;
 149         struct udevice db_udev;
 150
 151         strfieldcpy(filename, name);
 152         while (1) {
 153                 dbg("look for existing node '%s'", filename);
 154                 memset(&db_udev, 0x00, sizeof(struct udevice));
 155                 if (udev_db_get_device_byname(&db_udev, filename) != 0) {
 156                         dbg("free num=%d", num);
 157                         return num;
 158                 }
 159
 160                 num++;
 161                 if (num > 1000) {
 162                         info("find_free_number gone crazy (num=%d), aborted", num);
 163                         return -1;
 164                 }
 165                 snprintf(filename, NAME_SIZE, "%s%d", name, num);
 166                 filename[NAME_SIZE-1] = '\0';
 167         }
 168 }
 169
 170 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 171                          struct sysfs_class_device *class_dev,
 172                          struct sysfs_device *sysfs_device)
 173 {
 174         char temp[NAME_SIZE];
 175         char temp2[NAME_SIZE];
 176         char *tail;
 177         char *pos;
 178         char *attr;
 179         int len;
 180         int i;
 181         char c;
 182         char *spos;
 183         char *rest;
 184         int slen;
 185         struct sysfs_attribute *tmpattr;
 186         unsigned int next_free_number;
 187         struct sysfs_class_device *class_dev_parent;
 188
 189         pos = string;
 190         while (1) {
 191                 pos = strchr(pos, '%');
 192                 if (pos == NULL)
 193                         break;
 194
 195                 pos[0] = '\0';
 196                 tail = pos+1;
 197                 len = get_format_len(&tail);
 198                 c = tail[0];
 199                 strfieldcpy(temp, tail+1);
 200                 tail = temp;
 201                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 202                 attr = get_format_attribute(&tail);
 203
 204
 205                 switch (c) {
 206                 case 'p':
 207                         if (strlen(udev->devpath) == 0)
 208                                 break;
 209                         strfieldcatmax(string, udev->devpath, maxsize);
 210                         dbg("substitute kernel name '%s'", udev->kernel_name);
 211                         break;
 212                 case 'b':
 213                         if (strlen(udev->bus_id) == 0)
 214                                 break;
 215                         strfieldcatmax(string, udev->bus_id, maxsize);
 216                         dbg("substitute bus_id '%s'", udev->bus_id);
 217                         break;
 218                 case 'k':
 219                         if (strlen(udev->kernel_name) == 0)
 220                                 break;
 221                         strfieldcatmax(string, udev->kernel_name, maxsize);
 222                         dbg("substitute kernel name '%s'", udev->kernel_name);
 223                         break;
 224                 case 'n':
 225                         if (strlen(udev->kernel_number) == 0)
 226                                 break;
 227                         strfieldcatmax(string, udev->kernel_number, maxsize);
 228                         dbg("substitute kernel number '%s'", udev->kernel_number);
 229                                 break;
 230                 case 'm':
 231                         strintcatmax(string, minor(udev->devt), maxsize);
 232                         dbg("substitute minor number '%u'", minor(udev->devt));
 233                         break;
 234                 case 'M':
 235                         strintcatmax(string, major(udev->devt), maxsize);
 236                         dbg("substitute major number '%u'", major(udev->devt));
 237                         break;
 238                 case 'c':
 239                         if (strlen(udev->program_result) == 0)
 240                                 break;
 241                         /* get part part of the result string */
 242                         i = 0;
 243                         if (attr != NULL)
 244                                 i = strtoul(attr, &rest, 10);
 245                         if (i > 0) {
 246                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 247                                         i--;
 248                                         if (i == 0)
 249                                                 break;
 250                                 }
 251                                 if (i > 0) {
 252                                         dbg("requested part of result string not found");
 253                                         break;
 254                                 }
 255                                 if (rest[0] == '+')
 256                                         strfieldcpy(temp2, spos);
 257                                 else
 258                                         strfieldcpymax(temp2, spos, slen+1);
 259                                 strfieldcatmax(string, temp2, maxsize);
 260                                 dbg("substitute part of result string '%s'", temp2);
 261                         } else {
 262                                 strfieldcatmax(string, udev->program_result, maxsize);
 263                                 dbg("substitute result string '%s'", udev->program_result);
 264                         }
 265                         break;
 266                 case 's':
 267                         if (attr != NULL) {
 268                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 269                                 if (tmpattr == NULL) {
 270                                         dbg("sysfa attribute '%s' not found", attr);
 271                                         break;
 272                                 }
 273                                 /* strip trailing whitespace of matching value */
 274                                 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 275                                         i = len = strlen(tmpattr->value);
 276                                         while (i > 0 &&  isspace(tmpattr->value[i-1]))
 277                                                 i--;
 278                                         if (i < len) {
 279                                                 tmpattr->value[i] = '\0';
 280                                                 dbg("remove %i trailing whitespace chars from '%s'",
 281                                                          len - i, tmpattr->value);
 282                                         }
 283                                 }
 284                                 strfieldcatmax(string, tmpattr->value, maxsize);
 285                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 286                         } else {
 287                                 dbg("missing attribute");
 288                         }
 289                         break;
 290                 case '%':
 291                         strfieldcatmax(string, "%", maxsize);
 292                         pos++;
 293                         break;
 294                 case 'e':
 295                         next_free_number = find_free_number(udev, string);
 296                         if (next_free_number > 0) {
 297                                 sprintf(temp2, "%d", next_free_number);
 298                                 strfieldcatmax(string, temp2, maxsize);
 299                         }
 300                         break;
 301                 case 'P':
 302                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 303                         if (class_dev_parent != NULL) {
 304                                 struct udevice udev_parent;
 305
 306                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 307                                 memset(&udev_parent, 0x00, sizeof(struct udevice));
 308                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 309                                 strfieldcpy(udev_parent.devpath, &class_dev_parent->path[strlen(sysfs_path)]);
 310                                 if (udev_db_get_device(&udev_parent) == 0) {
 311                                         strfieldcatmax(string, udev_parent.name, maxsize);
 312                                         dbg("substitute parent node name'%s'", udev_parent.name);
 313                                 } else
 314                                         dbg("parent not found in database");
 315                         }
 316                         break;
 317                 case 'N':
 318                         if (udev->tmp_node[0] == '\0') {
 319                                 dbg("create temporary device node for callout");
 320                                 snprintf(udev->tmp_node, NAME_SIZE, "%s/.tmp-%u-%u", udev_root, major(udev->devt), minor(udev->devt));
 321                                 udev->tmp_node[NAME_SIZE] = '\0';
 322                                 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 323                         }
 324                         strfieldcatmax(string, udev->tmp_node, maxsize);
 325                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 326                         break;
 327                 case 'r':
 328                         strfieldcatmax(string, udev_root, maxsize);
 329                         dbg("substitute udev_root '%s'", udev_root);
 330                         break;
 331                 default:
 332                         dbg("unknown substitution type '%%%c'", c);
 333                         break;
 334                 }
 335                 /* truncate to specified length */
 336                 if (len > 0)
 337                         pos[len] = '\0';
 338
 339                 strfieldcatmax(string, tail, maxsize);
 340         }
 341 }
 342
 343 static void fix_kernel_name(struct udevice *udev)
 344 {
 345         char *temp = udev->kernel_name;
 346
 347         while (*temp != 0x00) {
 348                 /* Some block devices have a ! in their name,
 349                  * we need to change that to / */
 350                 if (*temp == '!')
 351                         *temp = '/';
 352                 ++temp;
 353         }
 354 }
 355
 356 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
 357 {
 358         int retval;
 359         int count;
 360         int status;
 361         int fds[2];
 362         pid_t pid;
 363         char *pos;
 364         char arg[PROGRAM_SIZE];
 365         char *argv[(PROGRAM_SIZE / 2) + 1];
 366         int i;
 367
 368         strfieldcpy(arg, path);
 369         i = 0;
 370         if (strchr(path, ' ')) {
 371                 pos = arg;
 372                 while (pos != NULL) {
 373                         if (pos[0] == '\'') {
 374                                 /* don't separate if in apostrophes */
 375                                 pos++;
 376                                 argv[i] = strsep(&pos, "\'");
 377                                 while (pos && pos[0] == ' ')
 378                                         pos++;
 379                         } else {
 380                                 argv[i] = strsep(&pos, " ");
 381                         }
 382                         dbg("arg[%i] '%s'", i, argv[i]);
 383                         i++;
 384                 }
 385                 argv[i] =  NULL;
 386                 dbg("execute '%s' with parsed arguments", arg);
 387         } else {
 388                 argv[0] = arg;
 389                 argv[1] = udev->subsystem;
 390                 argv[2] = NULL;
 391                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 392         }
 393
 394         retval = pipe(fds);
 395         if (retval != 0) {
 396                 dbg("pipe failed");
 397                 return -1;
 398         }
 399
 400         pid = fork();
 401         switch(pid) {
 402         case 0:
 403                 /* child */
 404                 /* dup2 write side of pipe to STDOUT */
 405                 dup2(fds[1], STDOUT_FILENO);
 406                 retval = execv(arg, argv);
 407
 408                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 409                 exit(1);
 410         case -1:
 411                 dbg("fork failed");
 412                 return -1;
 413         default:
 414                 /* parent reads from fds[0] */
 415                 close(fds[1]);
 416                 retval = 0;
 417                 i = 0;
 418                 while (1) {
 419                         count = read(fds[0], value + i, len - i-1);
 420                         if (count <= 0)
 421                                 break;
 422
 423                         i += count;
 424                         if (i >= len-1) {
 425                                 dbg("result len %d too short", len);
 426                                 retval = -1;
 427                                 break;
 428                         }
 429                 }
 430
 431                 if (count < 0) {
 432                         dbg("read failed with '%s'", strerror(errno));
 433                         retval = -1;
 434                 }
 435
 436                 if (i > 0 && value[i-1] == '\n')
 437                         i--;
 438                 value[i] = '\0';
 439                 dbg("result is '%s'", value);
 440
 441                 close(fds[0]);
 442                 waitpid(pid, &status, 0);
 443
 444                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 445                         dbg("exec program status 0x%x", status);
 446                         retval = -1;
 447                 }
 448         }
 449         return retval;
 450 }
 451
 452 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 453 {
 454         struct sysfs_attribute *tmpattr = NULL;
 455         char *c;
 456
 457         dbg("look for device attribute '%s'", attr);
 458         /* try to find the attribute in the class device directory */
 459         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 460         if (tmpattr)
 461                 goto attr_found;
 462
 463         /* look in the class device directory if present */
 464         if (sysfs_device) {
 465                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 466                 if (tmpattr)
 467                         goto attr_found;
 468         }
 469
 470         return NULL;
 471
 472 attr_found:
 473         c = strchr(tmpattr->value, '\n');
 474         if (c != NULL)
 475                 c[0] = '\0';
 476
 477         dbg("found attribute '%s'", tmpattr->path);
 478         return tmpattr;
 479 }
 480
 481 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 482 {
 483         struct sysfs_attribute *tmpattr;
 484         int i;
 485         int len;
 486
 487         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 488                 return -ENODEV;
 489
 490         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 491         if (tmpattr == NULL)
 492                 return -ENODEV;
 493
 494         /* strip trailing whitespace of value, if not asked to match for it */
 495         if (! isspace(pair->value[strlen(pair->value)-1])) {
 496                 i = len = strlen(tmpattr->value);
 497                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 498                         i--;
 499                 if (i < len) {
 500                         tmpattr->value[i] = '\0';
 501                         dbg("remove %i trailing whitespace chars from '%s'",
 502                             len - i, tmpattr->value);
 503                 }
 504         }
 505
 506         dbg("compare attribute '%s' value '%s' with '%s'",
 507                   pair->file, tmpattr->value, pair->value);
 508         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 509                 return -ENODEV;
 510
 511         dbg("found matching attribute '%s' with value '%s'",
 512             pair->file, pair->value);
 513         return 0;
 514 }
 515
 516 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 517 {
 518         struct sysfs_pair *pair;
 519         int i;
 520
 521         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 522                 pair = &dev->sysfs_pair[i];
 523                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 524                         break;
 525                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 526                         dbg("sysfs attribute doesn't match");
 527                         return -ENODEV;
 528                 }
 529         }
 530
 531         return 0;
 532 }
 533
 534 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 535 {
 536         char path[SYSFS_PATH_MAX];
 537         char *temp = NULL;
 538
 539         /* we have to have a sysfs device for ID to work */
 540         if (!sysfs_device)
 541                 return -ENODEV;
 542
 543         strfieldcpy(path, sysfs_device->path);
 544         temp = strrchr(path, '/');
 545         temp++;
 546         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 547         if (strcmp_pattern(dev->id, temp) != 0)
 548                 return -ENODEV;
 549         else
 550                 return 0;
 551 }
 552
 553 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 554 {
 555         char path[SYSFS_PATH_MAX];
 556         char *temp;
 557
 558         /* we have to have a sysfs device for PLACE to work */
 559         if (!sysfs_device)
 560                 return -ENODEV;
 561
 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                 return 0;
 567
 568         /* try the parent */
 569         temp[0] = '\0';
 570         temp = strrchr(path, '/');
 571         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 572         if (strstr(temp, dev->place) == NULL)
 573                 return 0;
 574
 575         dbg("place doesn't match");
 576         return -ENODEV;
 577 }
 578
 579 static int match_rule(struct udevice *udev, struct config_device *dev,
 580                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 581 {
 582         /* check for matching kernel name */
 583         if (dev->kernel[0] != '\0') {
 584                 dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'",
 585                     dev->kernel, class_dev->name);
 586                 if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 587                         dbg(FIELD_KERNEL " is not matching");
 588                         goto exit;
 589                 }
 590                 dbg(FIELD_KERNEL " matches");
 591         }
 592
 593         /* check for matching subsystem */
 594         if (dev->subsystem[0] != '\0') {
 595                 dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'",
 596                     dev->subsystem, class_dev->name);
 597                 if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) {
 598                         dbg(FIELD_SUBSYSTEM " is not matching");
 599                         goto exit;
 600                 }
 601                 dbg(FIELD_SUBSYSTEM " matches");
 602         }
 603
 604         /* walk up the chain of physical devices and find a match */
 605         while (1) {
 606                 /* check for matching driver */
 607                 if (dev->driver[0] != '\0') {
 608                         dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'",
 609                             dev->driver, sysfs_device->driver_name);
 610                         if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) {
 611                                 dbg(FIELD_DRIVER " is not matching");
 612                                 goto try_parent;
 613                         }
 614                         dbg(FIELD_DRIVER " matches");
 615                 }
 616
 617                 /* check for matching bus value */
 618                 if (dev->bus[0] != '\0') {
 619                         if (sysfs_device == NULL) {
 620                                 dbg("device has no bus");
 621                                 goto try_parent;
 622                         }
 623                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'",
 624                             dev->bus, sysfs_device->bus);
 625                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 626                                 dbg(FIELD_BUS " is not matching");
 627                                 goto try_parent;
 628                         }
 629                         dbg(FIELD_BUS " matches");
 630                 }
 631
 632                 /* check for matching bus id */
 633                 if (dev->id[0] != '\0') {
 634                         dbg("check " FIELD_ID);
 635                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 636                                 dbg(FIELD_ID " is not matching");
 637                                 goto try_parent;
 638                         }
 639                         dbg(FIELD_ID " matches");
 640                 }
 641
 642                 /* check for matching place of device */
 643                 if (dev->place[0] != '\0') {
 644                         dbg("check " FIELD_PLACE);
 645                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 646                                 dbg(FIELD_PLACE " is not matching");
 647                                 goto try_parent;
 648                         }
 649                         dbg(FIELD_PLACE " matches");
 650                 }
 651
 652                 /* check for matching sysfs pairs */
 653                 if (dev->sysfs_pair[0].file[0] != '\0') {
 654                         dbg("check " FIELD_SYSFS " pairs");
 655                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 656                                 dbg(FIELD_SYSFS " is not matching");
 657                                 goto try_parent;
 658                         }
 659                         dbg(FIELD_SYSFS " matches");
 660                 }
 661
 662                 /* found matching physical device  */
 663                 break;
 664 try_parent:
 665                 dbg("try parent sysfs device");
 666                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 667                 if (sysfs_device == NULL)
 668                         goto exit;
 669                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 670                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 671         }
 672
 673         /* execute external program */
 674         if (dev->program[0] != '\0') {
 675                 char program[PROGRAM_SIZE];
 676
 677                 dbg("check " FIELD_PROGRAM);
 678                 strfieldcpy(program, dev->program);
 679                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 680                 if (execute_program(udev, program, udev->program_result, NAME_SIZE) != 0) {
 681                         dbg(FIELD_PROGRAM " returned nonzero");
 682                         goto try_parent;
 683                 }
 684                 dbg(FIELD_PROGRAM " returned successful");
 685         }
 686
 687         /* check for matching result of external program */
 688         if (dev->result[0] != '\0') {
 689                 dbg("check for " FIELD_RESULT " dev->result='%s', udev->program_result='%s'",
 690                     dev->result, udev->program_result);
 691                 if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 692                         dbg(FIELD_RESULT " is not matching");
 693                         goto try_parent;
 694                 }
 695                 dbg(FIELD_RESULT " matches");
 696         }
 697
 698         /* rule matches */
 699         return 0;
 700
 701 exit:
 702         return -1;
 703 }
 704
 705 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
 706 {
 707         struct sysfs_class_device *class_dev_parent;
 708         struct sysfs_device *sysfs_device = NULL;
 709         struct config_device *dev;
 710         char *pos;
 711
 712         dbg("class_dev->name='%s'", class_dev->name);
 713
 714         /* Figure out where the "device"-symlink is at.  For char devices this will
 715          * always be in the class_dev->path.  On block devices, only the main block
 716          * device will have the device symlink in it's path. All partition devices
 717          * need to look at the symlink in its parent directory.
 718          */
 719         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 720         if (class_dev_parent != NULL) {
 721                 dbg("given class device has a parent, use this instead");
 722                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 723         } else {
 724                 sysfs_device = sysfs_get_classdev_device(class_dev);
 725         }
 726
 727         if (sysfs_device) {
 728                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 729                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 730                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 731         }
 732
 733         strfieldcpy(udev->kernel_name, class_dev->name);
 734         fix_kernel_name(udev);
 735         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 736
 737         /* get kernel number */
 738         pos = class_dev->name + strlen(class_dev->name);
 739         while (isdigit(*(pos-1)))
 740                 pos--;
 741         strfieldcpy(udev->kernel_number, pos);
 742         dbg("kernel_number='%s'", udev->kernel_number);
 743
 744         /* look for a matching rule to apply */
 745         list_for_each_entry(dev, &config_device_list, node) {
 746                 dbg("process rule");
 747                 if (match_rule(udev, dev, class_dev, sysfs_device) == 0) {
 748
 749                         /* FIXME: remove old style ignore rule and make OPTION="ignore" mandatory */
 750                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0' &&
 751                             dev->mode == 0000 && dev->owner[0] == '\0' && dev->group[0] == '\0' &&
 752                             !dev->ignore_device && !dev->partitions && !dev->ignore_remove) {
 753                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 754                                      dev->config_file, dev->config_line, udev->kernel_name);
 755                                 return -1;
 756                         }
 757
 758                         /* apply options */
 759                         if (dev->ignore_device) {
 760                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 761                                      dev->config_file, dev->config_line, udev->kernel_name);
 762                                 return -1;
 763                         }
 764                         if (dev->ignore_remove) {
 765                                 udev->ignore_remove = dev->ignore_remove;
 766                                 dbg_parse("remove event should be ignored");
 767                         }
 768                         /* apply all_partitions option only at a main block device */
 769                         if (dev->partitions && udev->type == BLOCK && udev->kernel_number[0] == '\0') {
 770                                 udev->partitions = dev->partitions;
 771                                 dbg("creation of partition nodes requested");
 772                         }
 773
 774                         /* apply permissions */
 775                         if (dev->mode != 0000) {
 776                                 udev->mode = dev->mode;
 777                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
 778                         }
 779                         if (dev->owner[0] != '\0') {
 780                                 strfieldcpy(udev->owner, dev->owner);
 781                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 782                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 783                         }
 784                         if (dev->group[0] != '\0') {
 785                                 strfieldcpy(udev->group, dev->group);
 786                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 787                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 788                         }
 789
 790                         /* collect symlinks for this or the final matching rule */
 791                         if (dev->symlink[0] != '\0') {
 792                                 char temp[NAME_SIZE];
 793
 794                                 info("configured rule in '%s[%i]' applied, added symlink '%s'",
 795                                      dev->config_file, dev->config_line, dev->symlink);
 796                                 strfieldcpy(temp, dev->symlink);
 797                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 798                                 if (udev->symlink[0] != '\0')
 799                                         strfieldcat(udev->symlink, " ");
 800                                 strfieldcat(udev->symlink, temp);
 801                         }
 802
 803                         /* rule matches */
 804                         if (dev->name[0] != '\0') {
 805                                 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
 806                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 807
 808                                 strfieldcpy(udev->name, dev->name);
 809                                 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 810                                 strfieldcpy(udev->config_file, dev->config_file);
 811                                 udev->config_line = dev->config_line;
 812
 813                                 if (udev->type != NET)
 814                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 815                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 816
 817                                 goto exit;
 818                         }
 819                 }
 820         }
 821
 822         /* no rule matched, so we use the kernel name */
 823         strfieldcpy(udev->name, udev->kernel_name);
 824         dbg("no rule found, use kernel name '%s'", udev->name);
 825
 826 exit:
 827         if (udev->tmp_node[0] != '\0') {
 828                 dbg("removing temporary device node");
 829                 unlink_secure(udev->tmp_node);
 830                 udev->tmp_node[0] = '\0';
 831         }
 832
 833         return 0;
 834 }