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 <time.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35 #ifndef __KLIBC__
  36 #include <sys/sysinfo.h>
  37 #endif
  38
  39 #include "libsysfs/sysfs/libsysfs.h"
  40 #include "list.h"
  41 #include "udev.h"
  42 #include "udev_lib.h"
  43 #include "udev_version.h"
  44 #include "logging.h"
  45 #include "namedev.h"
  46 #include "klibc_fixups.h"
  47
  48 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  49
  50 LIST_HEAD(config_device_list);
  51 LIST_HEAD(perm_device_list);
  52
  53
  54 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  55 static int strcmp_pattern(const char *p, const char *s)
  56 {
  57         if (s[0] == '\0') {
  58                 while (p[0] == '*')
  59                         p++;
  60                 return (p[0] != '\0');
  61         }
  62         switch (p[0]) {
  63         case '[':
  64                 {
  65                         int not = 0;
  66                         p++;
  67                         if (p[0] == '!') {
  68                                 not = 1;
  69                                 p++;
  70                         }
  71                         while ((p[0] != '\0') && (p[0] != ']')) {
  72                                 int match = 0;
  73                                 if (p[1] == '-') {
  74                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  75                                                 match = 1;
  76                                         p += 3;
  77                                 } else {
  78                                         match = (p[0] == s[0]);
  79                                         p++;
  80                                 }
  81                                 if (match ^ not) {
  82                                         while ((p[0] != '\0') && (p[0] != ']'))
  83                                                 p++;
  84                                         if (p[0] == ']')
  85                                                 return strcmp_pattern(p+1, s+1);
  86                                 }
  87                         }
  88                 }
  89                 break;
  90         case '*':
  91                 if (strcmp_pattern(p, s+1))
  92                         return strcmp_pattern(p+1, s);
  93                 return 0;
  94         case '\0':
  95                 if (s[0] == '\0') {
  96                         return 0;
  97                 }
  98                 break;
  99         default:
 100                 if ((p[0] == s[0]) || (p[0] == '?'))
 101                         return strcmp_pattern(p+1, s+1);
 102                 break;
 103         }
 104         return 1;
 105 }
 106
 107 static struct perm_device *find_perm(char *name)
 108 {
 109         struct perm_device *perm;
 110
 111         list_for_each_entry(perm, &perm_device_list, node) {
 112                 if (strcmp_pattern(perm->name, name))
 113                         continue;
 114                 return perm;
 115         }
 116         return NULL;
 117 }
 118
 119 static mode_t get_default_mode(void)
 120 {
 121         mode_t mode = 0600;     /* default to owner rw only */
 122
 123         if (strlen(default_mode_str) != 0)
 124                 mode = strtol(default_mode_str, NULL, 8);
 125
 126         return mode;
 127 }
 128
 129 static char *get_default_owner(void)
 130 {
 131         if (strlen(default_owner_str) == 0)
 132                 strfieldcpy(default_owner_str, "root");
 133
 134         return default_owner_str;
 135 }
 136
 137 static char *get_default_group(void)
 138 {
 139         if (strlen(default_group_str) == 0)
 140                 strfieldcpy(default_group_str, "root");
 141
 142         return default_group_str;
 143 }
 144
 145 /* extract possible {attr} and move str behind it */
 146 static char *get_format_attribute(char **str)
 147 {
 148         char *pos;
 149         char *attr = NULL;
 150
 151         if (*str[0] == '{') {
 152                 pos = strchr(*str, '}');
 153                 if (pos == NULL) {
 154                         dbg("missing closing brace for format");
 155                         return NULL;
 156                 }
 157                 pos[0] = '\0';
 158                 attr = *str+1;
 159                 *str = pos+1;
 160                 dbg("attribute='%s', str='%s'", attr, *str);
 161         }
 162         return attr;
 163 }
 164
 165 /* extract possible format length and move str behind it*/
 166 static int get_format_len(char **str)
 167 {
 168         int num;
 169         char *tail;
 170
 171         if (isdigit(*str[0])) {
 172                 num = (int) strtoul(*str, &tail, 10);
 173                 if (num > 0) {
 174                         *str = tail;
 175                         dbg("format length=%i", num);
 176                         return num;
 177                 } else {
 178                         dbg("format parsing error '%s'", *str);
 179                 }
 180         }
 181         return -1;
 182 }
 183
 184 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 185                          struct sysfs_class_device *class_dev,
 186                          struct sysfs_device *sysfs_device)
 187 {
 188         char temp[NAME_SIZE];
 189         char temp2[NAME_SIZE];
 190         char *tail;
 191         char *pos;
 192         char *attr;
 193         int len;
 194         int i;
 195         char c;
 196         char *spos;
 197         char *rest;
 198         int slen;
 199         struct sysfs_attribute *tmpattr;
 200
 201         pos = string;
 202
 203         while (1) {
 204                 pos = strchr(string, '%');
 205                 if (pos != NULL) {
 206                         pos[0] = '\0';
 207                         tail = pos+1;
 208                         len = get_format_len(&tail);
 209                         c = tail[0];
 210                         strfieldcpy(temp, tail+1);
 211                         tail = temp;
 212                 } else {
 213                         break;
 214                 }
 215                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 216
 217                 attr = get_format_attribute(&tail);
 218
 219                 switch (c) {
 220                 case 'b':
 221                         if (strlen(udev->bus_id) == 0)
 222                                 break;
 223                         strfieldcatmax(string, udev->bus_id, maxsize);
 224                         dbg("substitute bus_id '%s'", udev->bus_id);
 225                         break;
 226                 case 'k':
 227                         if (strlen(udev->kernel_name) == 0)
 228                                 break;
 229                         strfieldcatmax(string, udev->kernel_name, maxsize);
 230                         dbg("substitute kernel name '%s'", udev->kernel_name);
 231                         break;
 232                 case 'n':
 233                         if (strlen(udev->kernel_number) == 0)
 234                                 break;
 235                         strfieldcatmax(string, udev->kernel_number, maxsize);
 236                         dbg("substitute kernel number '%s'", udev->kernel_number);
 237                                 break;
 238                 case 'm':
 239                         strintcatmax(string, udev->minor, maxsize);
 240                         dbg("substitute minor number '%u'", udev->minor);
 241                         break;
 242                 case 'M':
 243                         strintcatmax(string, udev->major, maxsize);
 244                         dbg("substitute major number '%u'", udev->major);
 245                         break;
 246                 case 'c':
 247                         if (strlen(udev->program_result) == 0)
 248                                 break;
 249                         /* get part part of the result string */
 250                         i = 0;
 251                         if (attr != NULL)
 252                                 i = strtoul(attr, &rest, 10);
 253                         if (i > 0) {
 254                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 255                                         i--;
 256                                         if (i == 0)
 257                                                 break;
 258                                 }
 259                                 if (i > 0) {
 260                                         dbg("requested part of result string not found");
 261                                         break;
 262                                 }
 263                                 if (rest[0] == '+')
 264                                         strfieldcpy(temp2, spos);
 265                                 else
 266                                         strfieldcpymax(temp2, spos, slen+1);
 267                                 strfieldcatmax(string, temp2, maxsize);
 268                                 dbg("substitute part of result string '%s'", temp2);
 269                         } else {
 270                                 strfieldcatmax(string, udev->program_result, maxsize);
 271                                 dbg("substitute result string '%s'", udev->program_result);
 272                         }
 273                         break;
 274                 case 's':
 275                         if (attr != NULL) {
 276                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 277                                 if (tmpattr == NULL) {
 278                                         dbg("sysfa attribute '%s' not found", attr);
 279                                         break;
 280                                 }
 281                                 strfieldcatmax(string, tmpattr->value, maxsize);
 282                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 283                         } else {
 284                                 dbg("missing attribute");
 285                         }
 286                         break;
 287                 case '%':
 288                         strfieldcatmax(string, "%", maxsize);
 289                         break;
 290                 default:
 291                         dbg("unknown substitution type '%%%c'", c);
 292                         break;
 293                 }
 294                 /* truncate to specified length */
 295                 if (len > 0)
 296                         pos[len] = '\0';
 297
 298                 strfieldcatmax(string, tail, maxsize);
 299         }
 300 }
 301
 302 /*
 303  * Note, we can have multiple files for different busses in here due
 304  * to the mess that USB has for its device tree...
 305  */
 306 static struct bus_file {
 307         char *bus;
 308         char *file;
 309 } bus_files[] = {
 310         { .bus = "scsi",        .file = "vendor" },
 311         { .bus = "usb",         .file = "idVendor" },
 312         { .bus = "usb",         .file = "iInterface" },
 313         { .bus = "usb-serial",  .file = "detach_state" },
 314         { .bus = "ide",         .file = "detach_state" },
 315         { .bus = "pci",         .file = "vendor" },
 316         {}
 317 };
 318
 319 #define SECONDS_TO_WAIT_FOR_FILE        10
 320 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 321 {
 322         /* sleep until we see the file for this specific bus type show up this
 323          * is needed because we can easily out-run the kernel in looking for
 324          * these files before the paticular subsystem has created them in the
 325          * sysfs tree properly.
 326          *
 327          * And people thought that the /sbin/hotplug event system was going to
 328          * be slow, poo on you for arguing that before even testing it...
 329          */
 330         struct bus_file *b = &bus_files[0];
 331         struct sysfs_attribute *tmpattr;
 332         int found = 0;
 333         int loop = SECONDS_TO_WAIT_FOR_FILE;
 334
 335         while (1) {
 336                 if (b->bus == NULL) {
 337                         if (!found)
 338                                 break;
 339                         /* sleep to give the kernel a chance to create the file */
 340                         sleep(1);
 341                         --loop;
 342                         if (loop == 0)
 343                                 break;
 344                         b = &bus_files[0];
 345                 }
 346                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 347                         found = 1;
 348                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 349                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 350                         if (tmpattr) {
 351                                 /* found it! */
 352                                 goto exit;
 353                         }
 354                         dbg("can't find '%s' file", b->file);
 355                 }
 356                 ++b;
 357         }
 358         if (!found)
 359                 dbg("did not find bus type '%s' on list of bus_id_files, "
 360                     "contact greg@kroah.com", sysfs_device->bus);
 361 exit:
 362         return; /* here to prevent compiler warning... */
 363 }
 364
 365 static void fix_kernel_name(struct udevice *udev)
 366 {
 367         char *temp = udev->kernel_name;
 368
 369         while (*temp != 0x00) {
 370                 /* Some block devices have a ! in their name,
 371                  * we need to change that to / */
 372                 if (*temp == '!')
 373                         *temp = '/';
 374                 ++temp;
 375         }
 376 }
 377
 378 static int execute_program(char *path, char *value, int len)
 379 {
 380         int retval;
 381         int count;
 382         int status;
 383         int fds[2];
 384         pid_t pid;
 385         char *pos;
 386         char arg[PROGRAM_SIZE];
 387         char *argv[sizeof(arg) / 2];
 388         int i;
 389
 390         i = 0;
 391         if (strchr(path, ' ')) {
 392                 strfieldcpy(arg, path);
 393                 pos = arg;
 394                 while (pos != NULL) {
 395                         if (pos[0] == '\'') {
 396                                 /* don't separate if in apostrophes */
 397                                 pos++;
 398                                 argv[i] = strsep(&pos, "\'");
 399                                 while (pos[0] == ' ')
 400                                         pos++;
 401                 } else {
 402                                 argv[i] = strsep(&pos, " ");
 403                         }
 404                         dbg("arg[%i] '%s'", i, argv[i]);
 405                         i++;
 406                 }
 407         }
 408         argv[i] =  NULL;
 409
 410         retval = pipe(fds);
 411         if (retval != 0) {
 412                 dbg("pipe failed");
 413                 return -1;
 414         }
 415
 416         pid = fork();
 417         switch(pid) {
 418         case 0:
 419                 /* child */
 420                 close(STDOUT_FILENO);
 421
 422                 /* dup write side of pipe to STDOUT */
 423                 dup(fds[1]);
 424                 if (argv[0] !=  NULL) {
 425                         dbg("execute '%s' with given arguments", argv[0]);
 426                         retval = execv(argv[0], argv);
 427                 } else {
 428                         dbg("execute '%s' with main argument", path);
 429                         retval = execv(path, main_argv);
 430                 }
 431
 432                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 433                 exit(1);
 434         case -1:
 435                 dbg("fork failed");
 436                 return -1;
 437         default:
 438                 /* parent reads from fds[0] */
 439                 close(fds[1]);
 440                 retval = 0;
 441                 i = 0;
 442                 while (1) {
 443                         count = read(fds[0], value + i, len - i-1);
 444                         if (count <= 0)
 445                                 break;
 446
 447                         i += count;
 448                         if (i >= len-1) {
 449                                 dbg("result len %d too short", len);
 450                                 retval = -1;
 451                                 break;
 452                         }
 453                 }
 454
 455                 if (count < 0) {
 456                         dbg("read failed with '%s'", strerror(errno));
 457                         retval = -1;
 458                 }
 459
 460                 if (i > 0 && value[i-1] == '\n')
 461                         i--;
 462                 value[i] = '\0';
 463                 dbg("result is '%s'", value);
 464
 465                 close(fds[0]);
 466                 wait(&status);
 467
 468                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 469                         dbg("exec program status 0x%x", status);
 470                         retval = -1;
 471                 }
 472         }
 473         return retval;
 474 }
 475
 476 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 477 {
 478         struct sysfs_attribute *tmpattr = NULL;
 479         char *c;
 480
 481         dbg("look for device attribute '%s'", attr);
 482         /* try to find the attribute in the class device directory */
 483         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 484         if (tmpattr)
 485                 goto attr_found;
 486
 487         /* look in the class device directory if present */
 488         if (sysfs_device) {
 489                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 490                 if (tmpattr)
 491                         goto attr_found;
 492         }
 493
 494         return NULL;
 495
 496 attr_found:
 497         c = strchr(tmpattr->value, '\n');
 498         if (c != NULL)
 499                 c[0] = '\0';
 500
 501         dbg("found attribute '%s'", tmpattr->path);
 502         return tmpattr;
 503 }
 504
 505 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 506 {
 507         struct sysfs_attribute *tmpattr;
 508         int i;
 509         int len;
 510
 511         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 512                 return -ENODEV;
 513
 514         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 515         if (tmpattr == NULL)
 516                 return -ENODEV;
 517
 518         /* strip trailing whitespace of value, if not asked to match for it */
 519         if (! isspace(pair->value[strlen(pair->value)-1])) {
 520                 i = len = strlen(tmpattr->value);
 521                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 522                         i--;
 523                 if (i < len) {
 524                         tmpattr->value[i] = '\0';
 525                         dbg("remove %i trailing whitespace chars from '%s'",
 526                             len - i, tmpattr->value);
 527                 }
 528         }
 529
 530         dbg("compare attribute '%s' value '%s' with '%s'",
 531                   pair->file, tmpattr->value, pair->value);
 532         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 533                 return -ENODEV;
 534
 535         dbg("found matching attribute '%s' with value '%s'",
 536             pair->file, pair->value);
 537         return 0;
 538 }
 539
 540 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 541 {
 542         struct sysfs_pair *pair;
 543         int i;
 544
 545         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 546                 pair = &dev->sysfs_pair[i];
 547                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 548                         break;
 549                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 550                         dbg("sysfs attribute doesn't match");
 551                         return -ENODEV;
 552                 }
 553         }
 554
 555         return 0;
 556 }
 557
 558 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 559 {
 560         char path[SYSFS_PATH_MAX];
 561         char *temp = NULL;
 562
 563         /* we have to have a sysfs device for ID to work */
 564         if (!sysfs_device)
 565                 return -ENODEV;
 566
 567         strfieldcpy(path, sysfs_device->path);
 568         temp = strrchr(path, '/');
 569         temp++;
 570         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 571         if (strcmp_pattern(dev->id, temp) != 0)
 572                 return -ENODEV;
 573         else
 574                 return 0;
 575 }
 576
 577 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 578 {
 579         char path[SYSFS_PATH_MAX];
 580         int found;
 581         char *temp = NULL;
 582
 583         /* we have to have a sysfs device for PLACE to work */
 584         if (!sysfs_device)
 585                 return -ENODEV;
 586
 587         found = 0;
 588         strfieldcpy(path, sysfs_device->path);
 589         temp = strrchr(path, '/');
 590         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 591         if (strstr(temp, dev->place) != NULL) {
 592                 found = 1;
 593         } else {
 594                 *temp = 0x00;
 595                 temp = strrchr(path, '/');
 596                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 597                 if (strstr(temp, dev->place) != NULL)
 598                         found = 1;
 599         }
 600         if (!found) {
 601                 dbg("place doesn't match");
 602                 return -ENODEV;
 603         }
 604
 605         return 0;
 606 }
 607
 608 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 609 {
 610         struct sysfs_device *sysfs_device;
 611         struct sysfs_class_device *class_dev_parent;
 612         struct timespec tspec;
 613         int loop;
 614
 615         /* Figure out where the device symlink is at.  For char devices this will
 616          * always be in the class_dev->path.  But for block devices, it's different.
 617          * The main block device will have the device symlink in it's path, but
 618          * all partitions have the symlink in its parent directory.
 619          * But we need to watch out for block devices that do not have parents, yet
 620          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 621          * symlink yet.  We do sit and spin on waiting for them right now, we should
 622          * possibly have a whitelist for these devices here...
 623          */
 624         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 625         if (class_dev_parent != NULL)
 626                 dbg("given class device has a parent, use this instead");
 627
 628         tspec.tv_sec = 0;
 629         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 630         loop = 10;
 631         while (loop--) {
 632                 if (udev_sleep)
 633                         nanosleep(&tspec, NULL);
 634
 635                 if (class_dev_parent)
 636                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 637                 else
 638                         sysfs_device = sysfs_get_classdev_device(class_dev);
 639                 if (sysfs_device != NULL)
 640                         goto device_found;
 641         }
 642         dbg("timed out waiting for device symlink, continuing on anyway...");
 643
 644 device_found:
 645         /* We have another issue with just the wait above - the sysfs part of
 646          * the kernel may not be quick enough to have created the link to the
 647          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 648          * will not contain the actual bus name :(
 649          */
 650         if (sysfs_device) {
 651                 if (sysfs_device->bus[0] != '\0')
 652                         goto bus_found;
 653
 654                 loop = 10;
 655                 tspec.tv_nsec = 10000000;
 656                 while (loop--) {
 657                         if (udev_sleep)
 658                                 nanosleep(&tspec, NULL);
 659                         sysfs_get_device_bus(sysfs_device);
 660
 661                         if (sysfs_device->bus[0] != '\0')
 662                                 goto bus_found;
 663                 }
 664                 dbg("timed out waiting to find the device bus, continuing on anyway");
 665                 goto exit;
 666 bus_found:
 667                 dbg("device %s is registered with bus '%s'",
 668                                 sysfs_device->name, sysfs_device->bus);
 669         }
 670 exit:
 671         return sysfs_device;
 672 }
 673
 674 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 675 {
 676         while (1) {
 677                 /* check for matching bus value */
 678                 if (dev->bus[0] != '\0') {
 679                         if (sysfs_device == NULL) {
 680                                 dbg("device has no bus");
 681                                 goto try_parent;
 682                         }
 683                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 684                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 685                                 dbg(FIELD_BUS " is not matching");
 686                                 goto try_parent;
 687                         } else {
 688                                 dbg(FIELD_BUS " matches");
 689                         }
 690                 }
 691
 692                 /* check for matching kernel name*/
 693                 if (dev->kernel[0] != '\0') {
 694                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 695                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 696                                 dbg(FIELD_KERNEL " is not matching");
 697                                 goto try_parent;
 698                         } else {
 699                                 dbg(FIELD_KERNEL " matches");
 700                         }
 701                 }
 702
 703                 /* check for matching bus id */
 704                 if (dev->id[0] != '\0') {
 705                         dbg("check " FIELD_ID);
 706                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 707                                 dbg(FIELD_ID " is not matching");
 708                                 goto try_parent;
 709                         } else {
 710                                 dbg(FIELD_ID " matches");
 711                         }
 712                 }
 713
 714                 /* check for matching place of device */
 715                 if (dev->place[0] != '\0') {
 716                         dbg("check " FIELD_PLACE);
 717                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 718                                 dbg(FIELD_PLACE " is not matching");
 719                                 goto try_parent;
 720                         } else {
 721                                 dbg(FIELD_PLACE " matches");
 722                         }
 723                 }
 724
 725                 /* check for matching sysfs pairs */
 726                 if (dev->sysfs_pair[0].file[0] != '\0') {
 727                         dbg("check " FIELD_SYSFS " pairs");
 728                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 729                                 dbg(FIELD_SYSFS " is not matching");
 730                                 goto try_parent;
 731                         } else {
 732                                 dbg(FIELD_SYSFS " matches");
 733                         }
 734                 }
 735
 736                 /* execute external program */
 737                 if (dev->program[0] != '\0') {
 738                         dbg("check " FIELD_PROGRAM);
 739                         apply_format(udev, dev->program, sizeof(dev->program),
 740                                      class_dev, sysfs_device);
 741                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 742                                 dbg(FIELD_PROGRAM " returned nonzero");
 743                                 goto try_parent;
 744                         } else {
 745                                 dbg(FIELD_PROGRAM " returned successful");
 746                         }
 747                 }
 748
 749                 /* check for matching result of external program */
 750                 if (dev->result[0] != '\0') {
 751                         dbg("check for " FIELD_RESULT
 752                             " dev->result='%s', udev->program_result='%s'",
 753                             dev->result, udev->program_result);
 754                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 755                                 dbg(FIELD_RESULT " is not matching");
 756                                 goto try_parent;
 757                         } else {
 758                                 dbg(FIELD_RESULT " matches");
 759                         }
 760                 }
 761
 762                 /* Yeah, we matched! */
 763                 return 0;
 764
 765 try_parent:
 766                 dbg("try parent sysfs device");
 767                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 768                 if (sysfs_device == NULL)
 769                         return -ENODEV;
 770                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 771                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 772                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 773         }
 774
 775 }
 776
 777 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 778 {
 779         struct sysfs_device *sysfs_device = NULL;
 780         struct config_device *dev;
 781         struct perm_device *perm;
 782         struct sysinfo info;
 783         char *pos;
 784
 785         udev->mode = 0;
 786
 787         /* find the sysfs_device associated with this class device */
 788         sysfs_device = get_sysfs_device(class_dev);
 789         if (sysfs_device) {
 790                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 791                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 792                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 793                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 794                 wait_for_device_to_initialize(sysfs_device);
 795         }
 796         dbg("class_dev->name = '%s'", class_dev->name);
 797
 798         strfieldcpy(udev->kernel_name, class_dev->name);
 799         fix_kernel_name(udev);
 800         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 801
 802         /* get kernel number */
 803         pos = class_dev->name + strlen(class_dev->name);
 804         while (isdigit(*(pos-1)))
 805                 pos--;
 806         strfieldcpy(udev->kernel_number, pos);
 807         dbg("kernel_number='%s'", udev->kernel_number);
 808
 809         /* look for a matching rule to apply */
 810         list_for_each_entry(dev, &config_device_list, node) {
 811                 dbg("process rule");
 812                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 813                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
 814                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 815                                      dev->config_file, dev->config_line, udev->kernel_name);
 816                                 return -1;
 817                         }
 818
 819                         if (dev->symlink[0] != '\0') {
 820                                 char temp[NAME_SIZE];
 821
 822                                 info("configured rule in '%s' at line %i applied, added symlink '%s'",
 823                                      dev->config_file, dev->config_line, dev->symlink);
 824                                 strfieldcpy(temp, dev->symlink);
 825                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 826                                 if (udev->symlink[0] != '\0')
 827                                         strfieldcat(udev->symlink, " ");
 828                                 strfieldcat(udev->symlink, temp);
 829                         }
 830
 831                         if (dev->name[0] != '\0') {
 832                                 /* apply all_partitions flag only at a main block device */
 833                                 if (dev->partitions > 0 &&
 834                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 835                                         continue;
 836
 837                                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 838                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 839                                 strfieldcpy(udev->name, dev->name);
 840                                 goto found;
 841                         }
 842                 }
 843         }
 844         /* no rule was found so we use the kernel name */
 845         strfieldcpy(udev->name, udev->kernel_name);
 846         if (udev->type == 'n')
 847                 goto done;
 848         else
 849                 goto perms;
 850
 851 found:
 852         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 853
 854         if (udev->type == 'n')
 855                 goto done;
 856
 857         udev->partitions = dev->partitions;
 858         strfieldcpy(udev->config_file, dev->config_file);
 859         udev->config_line = dev->config_line;
 860
 861         /* get permissions given in rule */
 862         set_empty_perms(udev, dev->mode,
 863                               dev->owner,
 864                               dev->group);
 865
 866 perms:
 867         /* get permissions given in config file or set defaults */
 868         perm = find_perm(udev->name);
 869         if (perm != NULL) {
 870                 set_empty_perms(udev, perm->mode,
 871                                       perm->owner,
 872                                       perm->group);
 873         } else {
 874                 set_empty_perms(udev, get_default_mode(),
 875                                       get_default_owner(),
 876                                       get_default_group());
 877         }
 878
 879         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 880             udev->name, udev->owner, udev->group, udev->mode);
 881
 882 done:
 883         /* store time of action */
 884         sysinfo(&info);
 885         udev->config_uptime = info.uptime;
 886
 887         return 0;
 888 }
 889
 890 int namedev_init(void)
 891 {
 892         int retval;
 893
 894         retval = namedev_init_rules();
 895         if (retval)
 896                 return retval;
 897
 898         retval = namedev_init_permissions();
 899         if (retval)
 900                 return retval;
 901
 902         dump_config_dev_list();
 903         dump_perm_dev_list();
 904         return retval;
 905 }