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 #include <sys/sysinfo.h>
  35
  36 #include "libsysfs/sysfs/libsysfs.h"
  37 #include "list.h"
  38 #include "udev.h"
  39 #include "udev_lib.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 LIST_HEAD(config_device_list);
  48 LIST_HEAD(perm_device_list);
  49
  50
  51 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  52 static int strcmp_pattern(const char *p, const char *s)
  53 {
  54         if (s[0] == '\0') {
  55                 while (p[0] == '*')
  56                         p++;
  57                 return (p[0] != '\0');
  58         }
  59         switch (p[0]) {
  60         case '[':
  61                 {
  62                         int not = 0;
  63                         p++;
  64                         if (p[0] == '!') {
  65                                 not = 1;
  66                                 p++;
  67                         }
  68                         while ((p[0] != '\0') && (p[0] != ']')) {
  69                                 int match = 0;
  70                                 if (p[1] == '-') {
  71                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  72                                                 match = 1;
  73                                         p += 3;
  74                                 } else {
  75                                         match = (p[0] == s[0]);
  76                                         p++;
  77                                 }
  78                                 if (match ^ not) {
  79                                         while ((p[0] != '\0') && (p[0] != ']'))
  80                                                 p++;
  81                                         if (p[0] == ']')
  82                                                 return strcmp_pattern(p+1, s+1);
  83                                 }
  84                         }
  85                 }
  86                 break;
  87         case '*':
  88                 if (strcmp_pattern(p, s+1))
  89                         return strcmp_pattern(p+1, s);
  90                 return 0;
  91         case '\0':
  92                 if (s[0] == '\0') {
  93                         return 0;
  94                 }
  95                 break;
  96         default:
  97                 if ((p[0] == s[0]) || (p[0] == '?'))
  98                         return strcmp_pattern(p+1, s+1);
  99                 break;
 100         }
 101         return 1;
 102 }
 103
 104 static struct perm_device *find_perm(char *name)
 105 {
 106         struct perm_device *perm;
 107
 108         list_for_each_entry(perm, &perm_device_list, node) {
 109                 if (strcmp_pattern(perm->name, name))
 110                         continue;
 111                 return perm;
 112         }
 113         return NULL;
 114 }
 115
 116 static mode_t get_default_mode(void)
 117 {
 118         mode_t mode = 0600;     /* default to owner rw only */
 119
 120         if (strlen(default_mode_str) != 0)
 121                 mode = strtol(default_mode_str, NULL, 8);
 122
 123         return mode;
 124 }
 125
 126 static char *get_default_owner(void)
 127 {
 128         if (strlen(default_owner_str) == 0)
 129                 strfieldcpy(default_owner_str, "root");
 130
 131         return default_owner_str;
 132 }
 133
 134 static char *get_default_group(void)
 135 {
 136         if (strlen(default_group_str) == 0)
 137                 strfieldcpy(default_group_str, "root");
 138
 139         return default_group_str;
 140 }
 141
 142 /* extract possible {attr} and move str behind it */
 143 static char *get_format_attribute(char **str)
 144 {
 145         char *pos;
 146         char *attr = NULL;
 147
 148         if (*str[0] == '{') {
 149                 pos = strchr(*str, '}');
 150                 if (pos == NULL) {
 151                         dbg("missing closing brace for format");
 152                         return NULL;
 153                 }
 154                 pos[0] = '\0';
 155                 attr = *str+1;
 156                 *str = pos+1;
 157                 dbg("attribute='%s', str='%s'", attr, *str);
 158         }
 159         return attr;
 160 }
 161
 162 /* extract possible format length and move str behind it*/
 163 static int get_format_len(char **str)
 164 {
 165         int num;
 166         char *tail;
 167
 168         if (isdigit(*str[0])) {
 169                 num = (int) strtoul(*str, &tail, 10);
 170                 if (num > 0) {
 171                         *str = tail;
 172                         dbg("format length=%i", num);
 173                         return num;
 174                 } else {
 175                         dbg("format parsing error '%s'", *str);
 176                 }
 177         }
 178         return -1;
 179 }
 180
 181 /** Finds the lowest positive N such that <name>N isn't present in
 182  *  $(udevroot) either as a file or a symlink.
 183  *
 184  *  @param  name                Name to check for
 185  *  @return                     0 if <name> didn't exist and N otherwise.
 186  */
 187 static int find_free_number(struct udevice *udev, const char *name)
 188 {
 189         char filename[NAME_SIZE];
 190         int num = 0;
 191         struct udevice db_udev;
 192
 193         strfieldcpy(filename, name);
 194         while (1) {
 195                 dbg("look for existing node '%s'", filename);
 196                 memset(&db_udev, 0x00, sizeof(struct udevice));
 197                 if (udev_db_get_device_byname(&db_udev, filename) != 0) {
 198                         dbg("free num=%d", num);
 199                         return num;
 200                 }
 201
 202                 num++;
 203                 if (num > 1000) {
 204                         info("find_free_number gone crazy (num=%d), aborted", num);
 205                         return -1;
 206                 }
 207                 snprintf(filename, NAME_SIZE, "%s%d", name, num);
 208                 filename[NAME_SIZE-1] = '\0';
 209         }
 210 }
 211
 212 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 213                          struct sysfs_class_device *class_dev,
 214                          struct sysfs_device *sysfs_device)
 215 {
 216         char temp[NAME_SIZE];
 217         char temp2[NAME_SIZE];
 218         char *tail;
 219         char *pos;
 220         char *attr;
 221         int len;
 222         int i;
 223         char c;
 224         char *spos;
 225         char *rest;
 226         int slen;
 227         struct sysfs_attribute *tmpattr;
 228         unsigned int next_free_number;
 229
 230         pos = string;
 231         while (1) {
 232                 pos = strchr(pos, '%');
 233                 if (pos == NULL)
 234                         break;
 235
 236                 pos[0] = '\0';
 237                 tail = pos+1;
 238                 len = get_format_len(&tail);
 239                 c = tail[0];
 240                 strfieldcpy(temp, tail+1);
 241                 tail = temp;
 242                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 243                 attr = get_format_attribute(&tail);
 244
 245
 246                 switch (c) {
 247                 case 'b':
 248                         if (strlen(udev->bus_id) == 0)
 249                                 break;
 250                         strfieldcatmax(string, udev->bus_id, maxsize);
 251                         dbg("substitute bus_id '%s'", udev->bus_id);
 252                         break;
 253                 case 'k':
 254                         if (strlen(udev->kernel_name) == 0)
 255                                 break;
 256                         strfieldcatmax(string, udev->kernel_name, maxsize);
 257                         dbg("substitute kernel name '%s'", udev->kernel_name);
 258                         break;
 259                 case 'n':
 260                         if (strlen(udev->kernel_number) == 0)
 261                                 break;
 262                         strfieldcatmax(string, udev->kernel_number, maxsize);
 263                         dbg("substitute kernel number '%s'", udev->kernel_number);
 264                                 break;
 265                 case 'm':
 266                         strintcatmax(string, udev->minor, maxsize);
 267                         dbg("substitute minor number '%u'", udev->minor);
 268                         break;
 269                 case 'M':
 270                         strintcatmax(string, udev->major, maxsize);
 271                         dbg("substitute major number '%u'", udev->major);
 272                         break;
 273                 case 'c':
 274                         if (strlen(udev->program_result) == 0)
 275                                 break;
 276                         /* get part part of the result string */
 277                         i = 0;
 278                         if (attr != NULL)
 279                                 i = strtoul(attr, &rest, 10);
 280                         if (i > 0) {
 281                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 282                                         i--;
 283                                         if (i == 0)
 284                                                 break;
 285                                 }
 286                                 if (i > 0) {
 287                                         dbg("requested part of result string not found");
 288                                         break;
 289                                 }
 290                                 if (rest[0] == '+')
 291                                         strfieldcpy(temp2, spos);
 292                                 else
 293                                         strfieldcpymax(temp2, spos, slen+1);
 294                                 strfieldcatmax(string, temp2, maxsize);
 295                                 dbg("substitute part of result string '%s'", temp2);
 296                         } else {
 297                                 strfieldcatmax(string, udev->program_result, maxsize);
 298                                 dbg("substitute result string '%s'", udev->program_result);
 299                         }
 300                         break;
 301                 case 's':
 302                         if (attr != NULL) {
 303                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 304                                 if (tmpattr == NULL) {
 305                                         dbg("sysfa attribute '%s' not found", attr);
 306                                         break;
 307                                 }
 308                                 /* strip trailing whitespace of matching value */
 309                                 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 310                                         i = len = strlen(tmpattr->value);
 311                                         while (i > 0 &&  isspace(tmpattr->value[i-1]))
 312                                                 i--;
 313                                         if (i < len) {
 314                                                 tmpattr->value[i] = '\0';
 315                                                 dbg("remove %i trailing whitespace chars from '%s'",
 316                                                          len - i, tmpattr->value);
 317                                         }
 318                                 }
 319                                 strfieldcatmax(string, tmpattr->value, maxsize);
 320                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 321                         } else {
 322                                 dbg("missing attribute");
 323                         }
 324                         break;
 325                 case '%':
 326                         strfieldcatmax(string, "%", maxsize);
 327                         pos++;
 328                         break;
 329                 case 'e':
 330                         next_free_number = find_free_number(udev, string);
 331                         if (next_free_number > 0) {
 332                                 sprintf(temp2, "%d", next_free_number);
 333                                 strfieldcatmax(string, temp2, maxsize);
 334                         }
 335                         break;
 336                 default:
 337                         dbg("unknown substitution type '%%%c'", c);
 338                         break;
 339                 }
 340                 /* truncate to specified length */
 341                 if (len > 0)
 342                         pos[len] = '\0';
 343
 344                 strfieldcatmax(string, tail, maxsize);
 345         }
 346 }
 347
 348 static void fix_kernel_name(struct udevice *udev)
 349 {
 350         char *temp = udev->kernel_name;
 351
 352         while (*temp != 0x00) {
 353                 /* Some block devices have a ! in their name,
 354                  * we need to change that to / */
 355                 if (*temp == '!')
 356                         *temp = '/';
 357                 ++temp;
 358         }
 359 }
 360
 361 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
 362 {
 363         int retval;
 364         int count;
 365         int status;
 366         int fds[2];
 367         pid_t pid;
 368         char *pos;
 369         char arg[PROGRAM_SIZE];
 370         char *argv[(PROGRAM_SIZE / 2) + 1];
 371         int i;
 372
 373         strfieldcpy(arg, path);
 374         i = 0;
 375         if (strchr(path, ' ')) {
 376                 pos = arg;
 377                 while (pos != NULL) {
 378                         if (pos[0] == '\'') {
 379                                 /* don't separate if in apostrophes */
 380                                 pos++;
 381                                 argv[i] = strsep(&pos, "\'");
 382                                 while (pos && pos[0] == ' ')
 383                                         pos++;
 384                         } else {
 385                                 argv[i] = strsep(&pos, " ");
 386                         }
 387                         dbg("arg[%i] '%s'", i, argv[i]);
 388                         i++;
 389                 }
 390                 argv[i] =  NULL;
 391                 dbg("execute '%s' with parsed arguments", arg);
 392         } else {
 393                 argv[0] = arg;
 394                 argv[1] = udev->subsystem;
 395                 argv[2] = NULL;
 396                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 397         }
 398
 399         retval = pipe(fds);
 400         if (retval != 0) {
 401                 dbg("pipe failed");
 402                 return -1;
 403         }
 404
 405         pid = fork();
 406         switch(pid) {
 407         case 0:
 408                 /* child */
 409                 /* dup2 write side of pipe to STDOUT */
 410                 dup2(fds[1], STDOUT_FILENO);
 411                 retval = execv(arg, argv);
 412
 413                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 414                 exit(1);
 415         case -1:
 416                 dbg("fork failed");
 417                 return -1;
 418         default:
 419                 /* parent reads from fds[0] */
 420                 close(fds[1]);
 421                 retval = 0;
 422                 i = 0;
 423                 while (1) {
 424                         count = read(fds[0], value + i, len - i-1);
 425                         if (count <= 0)
 426                                 break;
 427
 428                         i += count;
 429                         if (i >= len-1) {
 430                                 dbg("result len %d too short", len);
 431                                 retval = -1;
 432                                 break;
 433                         }
 434                 }
 435
 436                 if (count < 0) {
 437                         dbg("read failed with '%s'", strerror(errno));
 438                         retval = -1;
 439                 }
 440
 441                 if (i > 0 && value[i-1] == '\n')
 442                         i--;
 443                 value[i] = '\0';
 444                 dbg("result is '%s'", value);
 445
 446                 close(fds[0]);
 447                 waitpid(pid, &status, 0);
 448
 449                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 450                         dbg("exec program status 0x%x", status);
 451                         retval = -1;
 452                 }
 453         }
 454         return retval;
 455 }
 456
 457 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 458 {
 459         struct sysfs_attribute *tmpattr = NULL;
 460         char *c;
 461
 462         dbg("look for device attribute '%s'", attr);
 463         /* try to find the attribute in the class device directory */
 464         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 465         if (tmpattr)
 466                 goto attr_found;
 467
 468         /* look in the class device directory if present */
 469         if (sysfs_device) {
 470                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 471                 if (tmpattr)
 472                         goto attr_found;
 473         }
 474
 475         return NULL;
 476
 477 attr_found:
 478         c = strchr(tmpattr->value, '\n');
 479         if (c != NULL)
 480                 c[0] = '\0';
 481
 482         dbg("found attribute '%s'", tmpattr->path);
 483         return tmpattr;
 484 }
 485
 486 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 487 {
 488         struct sysfs_attribute *tmpattr;
 489         int i;
 490         int len;
 491
 492         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 493                 return -ENODEV;
 494
 495         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 496         if (tmpattr == NULL)
 497                 return -ENODEV;
 498
 499         /* strip trailing whitespace of value, if not asked to match for it */
 500         if (! isspace(pair->value[strlen(pair->value)-1])) {
 501                 i = len = strlen(tmpattr->value);
 502                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 503                         i--;
 504                 if (i < len) {
 505                         tmpattr->value[i] = '\0';
 506                         dbg("remove %i trailing whitespace chars from '%s'",
 507                             len - i, tmpattr->value);
 508                 }
 509         }
 510
 511         dbg("compare attribute '%s' value '%s' with '%s'",
 512                   pair->file, tmpattr->value, pair->value);
 513         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 514                 return -ENODEV;
 515
 516         dbg("found matching attribute '%s' with value '%s'",
 517             pair->file, pair->value);
 518         return 0;
 519 }
 520
 521 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 522 {
 523         struct sysfs_pair *pair;
 524         int i;
 525
 526         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 527                 pair = &dev->sysfs_pair[i];
 528                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 529                         break;
 530                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 531                         dbg("sysfs attribute doesn't match");
 532                         return -ENODEV;
 533                 }
 534         }
 535
 536         return 0;
 537 }
 538
 539 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 540 {
 541         char path[SYSFS_PATH_MAX];
 542         char *temp = NULL;
 543
 544         /* we have to have a sysfs device for ID to work */
 545         if (!sysfs_device)
 546                 return -ENODEV;
 547
 548         strfieldcpy(path, sysfs_device->path);
 549         temp = strrchr(path, '/');
 550         temp++;
 551         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 552         if (strcmp_pattern(dev->id, temp) != 0)
 553                 return -ENODEV;
 554         else
 555                 return 0;
 556 }
 557
 558 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 559 {
 560         char path[SYSFS_PATH_MAX];
 561         int found;
 562         char *temp = NULL;
 563
 564         /* we have to have a sysfs device for PLACE to work */
 565         if (!sysfs_device)
 566                 return -ENODEV;
 567
 568         found = 0;
 569         strfieldcpy(path, sysfs_device->path);
 570         temp = strrchr(path, '/');
 571         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 572         if (strstr(temp, dev->place) != NULL) {
 573                 found = 1;
 574         } else {
 575                 *temp = 0x00;
 576                 temp = strrchr(path, '/');
 577                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 578                 if (strstr(temp, dev->place) != NULL)
 579                         found = 1;
 580         }
 581         if (!found) {
 582                 dbg("place doesn't match");
 583                 return -ENODEV;
 584         }
 585
 586         return 0;
 587 }
 588
 589 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 590 {
 591         while (1) {
 592                 /* check for matching bus value */
 593                 if (dev->bus[0] != '\0') {
 594                         if (sysfs_device == NULL) {
 595                                 dbg("device has no bus");
 596                                 goto try_parent;
 597                         }
 598                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 599                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 600                                 dbg(FIELD_BUS " is not matching");
 601                                 goto try_parent;
 602                         } else {
 603                                 dbg(FIELD_BUS " matches");
 604                         }
 605                 }
 606
 607                 /* check for matching kernel name */
 608                 if (dev->kernel[0] != '\0') {
 609                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 610                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 611                                 dbg(FIELD_KERNEL " is not matching");
 612                                 goto try_parent;
 613                         } else {
 614                                 dbg(FIELD_KERNEL " matches");
 615                         }
 616                 }
 617
 618                 /* check for matching subsystem */
 619                 if (dev->subsystem[0] != '\0') {
 620                         dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'", dev->subsystem, class_dev->name);
 621                         if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) {
 622                                 dbg(FIELD_SUBSYSTEM " is not matching");
 623                                 goto try_parent;
 624                         } else {
 625                                 dbg(FIELD_SUBSYSTEM " matches");
 626                         }
 627                 }
 628
 629                 /* check for matching driver */
 630                 if (dev->driver[0] != '\0') {
 631                         dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'", dev->driver, sysfs_device->driver_name);
 632                         if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) {
 633                                 dbg(FIELD_DRIVER " is not matching");
 634                                 goto try_parent;
 635                         } else {
 636                                 dbg(FIELD_DRIVER " matches");
 637                         }
 638                 }
 639
 640                 /* check for matching bus id */
 641                 if (dev->id[0] != '\0') {
 642                         dbg("check " FIELD_ID);
 643                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 644                                 dbg(FIELD_ID " is not matching");
 645                                 goto try_parent;
 646                         } else {
 647                                 dbg(FIELD_ID " matches");
 648                         }
 649                 }
 650
 651                 /* check for matching place of device */
 652                 if (dev->place[0] != '\0') {
 653                         dbg("check " FIELD_PLACE);
 654                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 655                                 dbg(FIELD_PLACE " is not matching");
 656                                 goto try_parent;
 657                         } else {
 658                                 dbg(FIELD_PLACE " matches");
 659                         }
 660                 }
 661
 662                 /* check for matching sysfs pairs */
 663                 if (dev->sysfs_pair[0].file[0] != '\0') {
 664                         dbg("check " FIELD_SYSFS " pairs");
 665                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 666                                 dbg(FIELD_SYSFS " is not matching");
 667                                 goto try_parent;
 668                         } else {
 669                                 dbg(FIELD_SYSFS " matches");
 670                         }
 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                         } else {
 684                                 dbg(FIELD_PROGRAM " returned successful");
 685                         }
 686                 }
 687
 688                 /* check for matching result of external program */
 689                 if (dev->result[0] != '\0') {
 690                         dbg("check for " FIELD_RESULT
 691                             " dev->result='%s', udev->program_result='%s'",
 692                             dev->result, udev->program_result);
 693                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 694                                 dbg(FIELD_RESULT " is not matching");
 695                                 goto try_parent;
 696                         } else {
 697                                 dbg(FIELD_RESULT " matches");
 698                         }
 699                 }
 700
 701                 /* Yeah, we matched! */
 702                 return 0;
 703
 704 try_parent:
 705                 dbg("try parent sysfs device");
 706                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 707                 if (sysfs_device == NULL)
 708                         return -ENODEV;
 709                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 710                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 711                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 712         }
 713
 714 }
 715
 716 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
 717 {
 718         struct sysfs_class_device *class_dev_parent;
 719         struct sysfs_device *sysfs_device = NULL;
 720         struct config_device *dev;
 721         struct perm_device *perm;
 722         struct sysinfo info;
 723         char *pos;
 724
 725         udev->mode = 0;
 726         dbg("class_dev->name='%s'", class_dev->name);
 727
 728         /* Figure out where the "device"-symlink is at.  For char devices this will
 729          * always be in the class_dev->path.  On block devices, only the main block
 730          * device will have the device symlink in it's path. All partition devices
 731          * need to look at the symlink in its parent directory.
 732          */
 733         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 734         if (class_dev_parent != NULL) {
 735                 dbg("given class device has a parent, use this instead");
 736                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 737         } else {
 738                 sysfs_device = sysfs_get_classdev_device(class_dev);
 739         }
 740
 741         if (sysfs_device) {
 742                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 743                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 744                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 745                 strfieldcpy(udev->bus, sysfs_device->bus);
 746         }
 747
 748         strfieldcpy(udev->kernel_name, class_dev->name);
 749         fix_kernel_name(udev);
 750         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 751
 752         /* get kernel number */
 753         pos = class_dev->name + strlen(class_dev->name);
 754         while (isdigit(*(pos-1)))
 755                 pos--;
 756         strfieldcpy(udev->kernel_number, pos);
 757         dbg("kernel_number='%s'", udev->kernel_number);
 758
 759         /* look for a matching rule to apply */
 760         list_for_each_entry(dev, &config_device_list, node) {
 761                 dbg("process rule");
 762                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 763                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
 764                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 765                                      dev->config_file, dev->config_line, udev->kernel_name);
 766                                 return -1;
 767                         }
 768
 769                         if (dev->symlink[0] != '\0') {
 770                                 char temp[NAME_SIZE];
 771
 772                                 info("configured rule in '%s' at line %i applied, added symlink '%s'",
 773                                      dev->config_file, dev->config_line, dev->symlink);
 774                                 strfieldcpy(temp, dev->symlink);
 775                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 776                                 if (udev->symlink[0] != '\0')
 777                                         strfieldcat(udev->symlink, " ");
 778                                 strfieldcat(udev->symlink, temp);
 779                         }
 780
 781                         if (dev->name[0] != '\0') {
 782                                 /* apply all_partitions flag only at a main block device */
 783                                 if (dev->partitions > 0 &&
 784                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 785                                         continue;
 786
 787                                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 788                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 789                                 strfieldcpy(udev->name, dev->name);
 790                                 goto found;
 791                         }
 792                 }
 793         }
 794         /* no rule was found so we use the kernel name */
 795         strfieldcpy(udev->name, udev->kernel_name);
 796         if (udev->type == 'n')
 797                 goto done;
 798         else
 799                 goto perms;
 800
 801 found:
 802         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 803         strfieldcpy(udev->config_file, dev->config_file);
 804         udev->config_line = dev->config_line;
 805
 806         if (udev->type == 'n')
 807                 goto done;
 808
 809         udev->partitions = dev->partitions;
 810         udev->ignore_remove = dev->ignore_remove;
 811
 812         if (dev->group[0] != '\0') {
 813                 strfieldcpy(udev->group, dev->group);
 814                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 815         }
 816
 817         /* get permissions given in rule */
 818         set_empty_perms(udev, dev->mode,
 819                               dev->owner,
 820                               dev->group);
 821
 822 perms:
 823         /* get permissions given in config file or set defaults */
 824         perm = find_perm(udev->name);
 825         if (perm != NULL) {
 826                 set_empty_perms(udev, perm->mode,
 827                                       perm->owner,
 828                                       perm->group);
 829         }
 830         set_empty_perms(udev, get_default_mode(),
 831                               get_default_owner(),
 832                               get_default_group());
 833
 834         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 835             udev->name, udev->owner, udev->group, udev->mode);
 836
 837 done:
 838         /* store time of action */
 839         sysinfo(&info);
 840         udev->config_uptime = info.uptime;
 841
 842         return 0;
 843 }
 844
 845 int namedev_init(void)
 846 {
 847         int retval;
 848
 849         retval = namedev_init_rules();
 850         if (retval)
 851                 return retval;
 852
 853         retval = namedev_init_permissions();
 854         if (retval)
 855                 return retval;
 856
 857         dump_config_dev_list();
 858         dump_perm_dev_list();
 859         return retval;
 860 }