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
  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 "klibc_fixups.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 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 182                          struct sysfs_class_device *class_dev,
 183                          struct sysfs_device *sysfs_device)
 184 {
 185         char temp[NAME_SIZE];
 186         char temp2[NAME_SIZE];
 187         char *tail;
 188         char *pos;
 189         char *attr;
 190         int len;
 191         int i;
 192         char c;
 193         char *spos;
 194         char *rest;
 195         int slen;
 196         struct sysfs_attribute *tmpattr;
 197
 198         pos = string;
 199
 200         while (1) {
 201                 pos = strchr(string, '%');
 202                 if (pos != NULL) {
 203                         pos[0] = '\0';
 204                         tail = pos+1;
 205                         len = get_format_len(&tail);
 206                         c = tail[0];
 207                         strfieldcpy(temp, tail+1);
 208                         tail = temp;
 209                 } else {
 210                         break;
 211                 }
 212                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 213
 214                 attr = get_format_attribute(&tail);
 215
 216                 switch (c) {
 217                 case 'b':
 218                         if (strlen(udev->bus_id) == 0)
 219                                 break;
 220                         strfieldcatmax(string, udev->bus_id, maxsize);
 221                         dbg("substitute bus_id '%s'", udev->bus_id);
 222                         break;
 223                 case 'k':
 224                         if (strlen(udev->kernel_name) == 0)
 225                                 break;
 226                         strfieldcatmax(string, udev->kernel_name, maxsize);
 227                         dbg("substitute kernel name '%s'", udev->kernel_name);
 228                         break;
 229                 case 'n':
 230                         if (strlen(udev->kernel_number) == 0)
 231                                 break;
 232                         strfieldcatmax(string, udev->kernel_number, maxsize);
 233                         dbg("substitute kernel number '%s'", udev->kernel_number);
 234                                 break;
 235                 case 'm':
 236                         strintcatmax(string, udev->minor, maxsize);
 237                         dbg("substitute minor number '%u'", udev->minor);
 238                         break;
 239                 case 'M':
 240                         strintcatmax(string, udev->major, maxsize);
 241                         dbg("substitute major number '%u'", udev->major);
 242                         break;
 243                 case 'c':
 244                         if (strlen(udev->program_result) == 0)
 245                                 break;
 246                         /* get part part of the result string */
 247                         i = 0;
 248                         if (attr != NULL)
 249                                 i = strtoul(attr, &rest, 10);
 250                         if (i > 0) {
 251                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 252                                         i--;
 253                                         if (i == 0)
 254                                                 break;
 255                                 }
 256                                 if (i > 0) {
 257                                         dbg("requested part of result string not found");
 258                                         break;
 259                                 }
 260                                 if (rest[0] == '+')
 261                                         strfieldcpy(temp2, spos);
 262                                 else
 263                                         strfieldcpymax(temp2, spos, slen+1);
 264                                 strfieldcatmax(string, temp2, maxsize);
 265                                 dbg("substitute part of result string '%s'", temp2);
 266                         } else {
 267                                 strfieldcatmax(string, udev->program_result, maxsize);
 268                                 dbg("substitute result string '%s'", udev->program_result);
 269                         }
 270                         break;
 271                 case 's':
 272                         if (attr != NULL) {
 273                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 274                                 if (tmpattr == NULL) {
 275                                         dbg("sysfa attribute '%s' not found", attr);
 276                                         break;
 277                                 }
 278                                 strfieldcatmax(string, tmpattr->value, maxsize);
 279                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 280                         } else {
 281                                 dbg("missing attribute");
 282                         }
 283                         break;
 284                 case '%':
 285                         strfieldcatmax(string, "%", maxsize);
 286                         break;
 287                 default:
 288                         dbg("unknown substitution type '%%%c'", c);
 289                         break;
 290                 }
 291                 /* truncate to specified length */
 292                 if (len > 0)
 293                         pos[len] = '\0';
 294
 295                 strfieldcatmax(string, tail, maxsize);
 296         }
 297 }
 298
 299 /*
 300  * Note, we can have multiple files for different busses in here due
 301  * to the mess that USB has for its device tree...
 302  */
 303 static struct bus_file {
 304         char *bus;
 305         char *file;
 306 } bus_files[] = {
 307         { .bus = "scsi",        .file = "vendor" },
 308         { .bus = "usb",         .file = "idVendor" },
 309         { .bus = "usb",         .file = "iInterface" },
 310         { .bus = "usb-serial",  .file = "detach_state" },
 311         { .bus = "ide",         .file = "detach_state" },
 312         { .bus = "pci",         .file = "vendor" },
 313         {}
 314 };
 315
 316 #define SECONDS_TO_WAIT_FOR_FILE        10
 317 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 318 {
 319         /* sleep until we see the file for this specific bus type show up this
 320          * is needed because we can easily out-run the kernel in looking for
 321          * these files before the paticular subsystem has created them in the
 322          * sysfs tree properly.
 323          *
 324          * And people thought that the /sbin/hotplug event system was going to
 325          * be slow, poo on you for arguing that before even testing it...
 326          */
 327         struct bus_file *b = &bus_files[0];
 328         struct sysfs_attribute *tmpattr;
 329         int found = 0;
 330         int loop = SECONDS_TO_WAIT_FOR_FILE;
 331
 332         while (1) {
 333                 if (b->bus == NULL) {
 334                         if (!found)
 335                                 break;
 336                         /* sleep to give the kernel a chance to create the file */
 337                         sleep(1);
 338                         --loop;
 339                         if (loop == 0)
 340                                 break;
 341                         b = &bus_files[0];
 342                 }
 343                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 344                         found = 1;
 345                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 346                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 347                         if (tmpattr) {
 348                                 /* found it! */
 349                                 goto exit;
 350                         }
 351                         dbg("can't find '%s' file", b->file);
 352                 }
 353                 ++b;
 354         }
 355         if (!found)
 356                 dbg("did not find bus type '%s' on list of bus_id_files, "
 357                     "contact greg@kroah.com", sysfs_device->bus);
 358 exit:
 359         return; /* here to prevent compiler warning... */
 360 }
 361
 362 static void fix_kernel_name(struct udevice *udev)
 363 {
 364         char *temp = udev->kernel_name;
 365
 366         while (*temp != 0x00) {
 367                 /* Some block devices have a ! in their name,
 368                  * we need to change that to / */
 369                 if (*temp == '!')
 370                         *temp = '/';
 371                 ++temp;
 372         }
 373 }
 374
 375 static int execute_program(char *path, char *value, int len)
 376 {
 377         int retval;
 378         int count;
 379         int status;
 380         int fds[2];
 381         pid_t pid;
 382         char *pos;
 383         char arg[PROGRAM_SIZE];
 384         char *argv[sizeof(arg) / 2];
 385         int i;
 386
 387         i = 0;
 388         if (strchr(path, ' ')) {
 389                 strfieldcpy(arg, path);
 390                 pos = arg;
 391                 while (pos != NULL) {
 392                         if (pos[0] == '\'') {
 393                                 /* don't separate if in apostrophes */
 394                                 pos++;
 395                                 argv[i] = strsep(&pos, "\'");
 396                                 while (pos[0] == ' ')
 397                                         pos++;
 398                 } else {
 399                                 argv[i] = strsep(&pos, " ");
 400                         }
 401                         dbg("arg[%i] '%s'", i, argv[i]);
 402                         i++;
 403                 }
 404         }
 405         argv[i] =  NULL;
 406
 407         retval = pipe(fds);
 408         if (retval != 0) {
 409                 dbg("pipe failed");
 410                 return -1;
 411         }
 412
 413         pid = fork();
 414         switch(pid) {
 415         case 0:
 416                 /* child */
 417                 close(STDOUT_FILENO);
 418
 419                 /* dup write side of pipe to STDOUT */
 420                 dup(fds[1]);
 421                 if (argv[0] !=  NULL) {
 422                         dbg("execute '%s' with given arguments", argv[0]);
 423                         retval = execv(argv[0], argv);
 424                 } else {
 425                         dbg("execute '%s' with main argument", path);
 426                         retval = execv(path, main_argv);
 427                 }
 428
 429                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 430                 exit(1);
 431         case -1:
 432                 dbg("fork failed");
 433                 return -1;
 434         default:
 435                 /* parent reads from fds[0] */
 436                 close(fds[1]);
 437                 retval = 0;
 438                 i = 0;
 439                 while (1) {
 440                         count = read(fds[0], value + i, len - i-1);
 441                         if (count <= 0)
 442                                 break;
 443
 444                         i += count;
 445                         if (i >= len-1) {
 446                                 dbg("result len %d too short", len);
 447                                 retval = -1;
 448                                 break;
 449                         }
 450                 }
 451
 452                 if (count < 0) {
 453                         dbg("read failed with '%s'", strerror(errno));
 454                         retval = -1;
 455                 }
 456
 457                 if (i > 0 && value[i] == '\n')
 458                         i--;
 459                 value[i] = '\0';
 460                 dbg("result is '%s'", value);
 461
 462                 close(fds[0]);
 463                 wait(&status);
 464
 465                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 466                         dbg("exec program status 0x%x", status);
 467                         retval = -1;
 468                 }
 469         }
 470         return retval;
 471 }
 472
 473 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 474 {
 475         struct sysfs_attribute *tmpattr = NULL;
 476         char *c;
 477
 478         dbg("look for device attribute '%s'", attr);
 479         /* try to find the attribute in the class device directory */
 480         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 481         if (tmpattr)
 482                 goto attr_found;
 483
 484         /* look in the class device directory if present */
 485         if (sysfs_device) {
 486                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 487                 if (tmpattr)
 488                         goto attr_found;
 489         }
 490
 491         return NULL;
 492
 493 attr_found:
 494         c = strchr(tmpattr->value, '\n');
 495         if (c != NULL)
 496                 c[0] = '\0';
 497
 498         dbg("found attribute '%s'", tmpattr->path);
 499         return tmpattr;
 500 }
 501
 502 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 503 {
 504         struct sysfs_attribute *tmpattr;
 505         int i;
 506         int len;
 507
 508         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 509                 return -ENODEV;
 510
 511         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 512         if (tmpattr == NULL)
 513                 return -ENODEV;
 514
 515         /* strip trailing whitespace of value, if not asked to match for it */
 516         if (! isspace(pair->value[strlen(pair->value)-1])) {
 517                 i = len = strlen(tmpattr->value);
 518                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 519                         i--;
 520                 if (i < len) {
 521                         tmpattr->value[i] = '\0';
 522                         dbg("remove %i trailing whitespace chars from '%s'",
 523                             len - i, tmpattr->value);
 524                 }
 525         }
 526
 527         dbg("compare attribute '%s' value '%s' with '%s'",
 528                   pair->file, tmpattr->value, pair->value);
 529         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 530                 return -ENODEV;
 531
 532         dbg("found matching attribute '%s' with value '%s'",
 533             pair->file, pair->value);
 534         return 0;
 535 }
 536
 537 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 538 {
 539         struct sysfs_pair *pair;
 540         int i;
 541
 542         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 543                 pair = &dev->sysfs_pair[i];
 544                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 545                         break;
 546                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 547                         dbg("sysfs attribute doesn't match");
 548                         return -ENODEV;
 549                 }
 550         }
 551
 552         return 0;
 553 }
 554
 555 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 556 {
 557         char path[SYSFS_PATH_MAX];
 558         char *temp = NULL;
 559
 560         /* we have to have a sysfs device for ID to work */
 561         if (!sysfs_device)
 562                 return -ENODEV;
 563
 564         strfieldcpy(path, sysfs_device->path);
 565         temp = strrchr(path, '/');
 566         temp++;
 567         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 568         if (strcmp_pattern(dev->id, temp) != 0)
 569                 return -ENODEV;
 570         else
 571                 return 0;
 572 }
 573
 574 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 575 {
 576         char path[SYSFS_PATH_MAX];
 577         int found;
 578         char *temp = NULL;
 579
 580         /* we have to have a sysfs device for PLACE to work */
 581         if (!sysfs_device)
 582                 return -ENODEV;
 583
 584         found = 0;
 585         strfieldcpy(path, sysfs_device->path);
 586         temp = strrchr(path, '/');
 587         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 588         if (strstr(temp, dev->place) != NULL) {
 589                 found = 1;
 590         } else {
 591                 *temp = 0x00;
 592                 temp = strrchr(path, '/');
 593                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 594                 if (strstr(temp, dev->place) != NULL)
 595                         found = 1;
 596         }
 597         if (!found) {
 598                 dbg("place doesn't match");
 599                 return -ENODEV;
 600         }
 601
 602         return 0;
 603 }
 604
 605 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 606 {
 607         struct sysfs_device *sysfs_device;
 608         struct sysfs_class_device *class_dev_parent;
 609         struct timespec tspec;
 610         int loop;
 611
 612         /* Figure out where the device symlink is at.  For char devices this will
 613          * always be in the class_dev->path.  But for block devices, it's different.
 614          * The main block device will have the device symlink in it's path, but
 615          * all partitions have the symlink in its parent directory.
 616          * But we need to watch out for block devices that do not have parents, yet
 617          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 618          * symlink yet.  We do sit and spin on waiting for them right now, we should
 619          * possibly have a whitelist for these devices here...
 620          */
 621         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 622         if (class_dev_parent)
 623                 dbg("Really a partition");
 624
 625         tspec.tv_sec = 0;
 626         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 627         loop = 10;
 628         while (loop--) {
 629                 if (udev_sleep)
 630                         nanosleep(&tspec, NULL);
 631                 if (class_dev_parent)
 632                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 633                 else
 634                         sysfs_device = sysfs_get_classdev_device(class_dev);
 635
 636                 if (sysfs_device != NULL)
 637                         goto device_found;
 638         }
 639         dbg("timed out waiting for device symlink, continuing on anyway...");
 640
 641 device_found:
 642         /* We have another issue with just the wait above - the sysfs part of
 643          * the kernel may not be quick enough to have created the link to the
 644          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 645          * will not contain the actual bus name :(
 646          *
 647          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 648          * if needed
 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         char *pos;
 783
 784         udev->mode = 0;
 785
 786         /* find the sysfs_device associated with this class device */
 787         sysfs_device = get_sysfs_device(class_dev);
 788         if (sysfs_device) {
 789                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 790                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 791                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 792                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 793                 wait_for_device_to_initialize(sysfs_device);
 794         }
 795         dbg("class_dev->name = '%s'", class_dev->name);
 796
 797         strfieldcpy(udev->kernel_name, class_dev->name);
 798         fix_kernel_name(udev);
 799         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 800
 801         /* get kernel number */
 802         pos = class_dev->name + strlen(class_dev->name);
 803         while (isdigit(*(pos-1)))
 804                 pos--;
 805         strfieldcpy(udev->kernel_number, pos);
 806         dbg("kernel_number='%s'", udev->kernel_number);
 807
 808         /* look for a matching rule to apply */
 809         list_for_each_entry(dev, &config_device_list, node) {
 810                 dbg("process rule");
 811                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 812                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
 813                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 814                                      dev->config_file, dev->config_line, udev->kernel_name);
 815                                 return -1;
 816                         }
 817
 818                         if (dev->symlink[0] != '\0') {
 819                                 char temp[NAME_SIZE];
 820
 821                                 info("configured rule in '%s' at line %i applied, added symlink '%s'",
 822                                      dev->config_file, dev->config_line, dev->symlink);
 823                                 strfieldcpy(temp, dev->symlink);
 824                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 825                                 if (udev->symlink[0] != '\0')
 826                                         strfieldcat(udev->symlink, " ");
 827                                 strfieldcat(udev->symlink, temp);
 828                         }
 829
 830                         if (dev->name[0] != '\0') {
 831                                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 832                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 833                                 strfieldcpy(udev->name, dev->name);
 834                                 goto found;
 835                         }
 836                 }
 837         }
 838
 839         /* no rule was found so we use the kernel name */
 840         strfieldcpy(udev->name, udev->kernel_name);
 841         goto done;
 842
 843 found:
 844         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 845         udev->partitions = dev->partitions;
 846         strfieldcpy(udev->config_file, dev->config_file);
 847         udev->config_line = dev->config_line;
 848
 849         /* get permissions given in rule */
 850         set_empty_perms(udev, dev->mode,
 851                               dev->owner,
 852                               dev->group);
 853
 854 done:
 855         /* get permissions given in config file or set defaults */
 856         perm = find_perm(udev->name);
 857         if (perm != NULL) {
 858                 set_empty_perms(udev, perm->mode,
 859                                       perm->owner,
 860                                       perm->group);
 861         } else {
 862                 set_empty_perms(udev, get_default_mode(),
 863                                       get_default_owner(),
 864                                       get_default_group());
 865         }
 866
 867         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 868             udev->name, udev->owner, udev->group, udev->mode);
 869
 870         /* store time of action */
 871         udev->config_time = time(NULL);
 872
 873         return 0;
 874 }
 875
 876 int namedev_init(void)
 877 {
 878         int retval;
 879
 880         retval = namedev_init_rules();
 881         if (retval)
 882                 return retval;
 883
 884         retval = namedev_init_permissions();
 885         if (retval)
 886                 return retval;
 887
 888         dump_config_dev_list();
 889         dump_perm_dev_list();
 890         return retval;
 891 }