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_version.h"
  40 #include "logging.h"
  41 #include "namedev.h"
  42 #include "klibc_fixups.h"
  43
  44 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  45
  46 LIST_HEAD(config_device_list);
  47 LIST_HEAD(perm_device_list);
  48
  49 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  50 static int strcmp_pattern(const char *p, const char *s)
  51 {
  52         if (s[0] == '\0') {
  53                 while (p[0] == '*')
  54                         p++;
  55                 return (p[0] != '\0');
  56         }
  57         switch (p[0]) {
  58         case '[':
  59                 {
  60                         int not = 0;
  61                         p++;
  62                         if (p[0] == '!') {
  63                                 not = 1;
  64                                 p++;
  65                         }
  66                         while ((p[0] != '\0') && (p[0] != ']')) {
  67                                 int match = 0;
  68                                 if (p[1] == '-') {
  69                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  70                                                 match = 1;
  71                                         p += 3;
  72                                 } else {
  73                                         match = (p[0] == s[0]);
  74                                         p++;
  75                                 }
  76                                 if (match ^ not) {
  77                                         while ((p[0] != '\0') && (p[0] != ']'))
  78                                                 p++;
  79                                         if (p[0] == ']')
  80                                                 return strcmp_pattern(p+1, s+1);
  81                                 }
  82                         }
  83                 }
  84                 break;
  85         case '*':
  86                 if (strcmp_pattern(p, s+1))
  87                         return strcmp_pattern(p+1, s);
  88                 return 0;
  89         case '\0':
  90                 if (s[0] == '\0') {
  91                         return 0;
  92                 }
  93                 break;
  94         default:
  95                 if ((p[0] == s[0]) || (p[0] == '?'))
  96                         return strcmp_pattern(p+1, s+1);
  97                 break;
  98         }
  99         return 1;
 100 }
 101
 102 #define copy_var(a, b, var)             \
 103         if (b->var)                     \
 104                 a->var = b->var;
 105
 106 #define copy_string(a, b, var)          \
 107         if (strlen(b->var))             \
 108                 strcpy(a->var, b->var);
 109
 110 int add_perm_dev(struct perm_device *new_dev)
 111 {
 112         struct perm_device *dev;
 113         struct perm_device *tmp_dev;
 114
 115         /* update the values if we already have the device */
 116         list_for_each_entry(dev, &perm_device_list, node) {
 117                 if (strcmp(new_dev->name, dev->name))
 118                         continue;
 119                 copy_var(dev, new_dev, mode);
 120                 copy_string(dev, new_dev, owner);
 121                 copy_string(dev, new_dev, group);
 122                 return 0;
 123         }
 124
 125         /* not found, add new structure to the perm list */
 126         tmp_dev = malloc(sizeof(*tmp_dev));
 127         if (!tmp_dev)
 128                 return -ENOMEM;
 129         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 130         list_add_tail(&tmp_dev->node, &perm_device_list);
 131         //dump_perm_dev(tmp_dev);
 132         return 0;
 133 }
 134
 135 static struct perm_device *find_perm(char *name)
 136 {
 137         struct perm_device *perm;
 138
 139         list_for_each_entry(perm, &perm_device_list, node) {
 140                 if (strcmp_pattern(perm->name, name))
 141                         continue;
 142                 return perm;
 143         }
 144         return NULL;
 145 }
 146
 147 static mode_t get_default_mode(void)
 148 {
 149         mode_t mode = 0600;     /* default to owner rw only */
 150
 151         if (strlen(default_mode_str) != 0)
 152                 mode = strtol(default_mode_str, NULL, 8);
 153
 154         return mode;
 155 }
 156
 157 static char *get_default_owner(void)
 158 {
 159         if (strlen(default_owner_str) == 0)
 160                 strfieldcpy(default_owner_str, "root");
 161
 162         return default_owner_str;
 163 }
 164
 165 static char *get_default_group(void)
 166 {
 167         if (strlen(default_group_str) == 0)
 168                 strfieldcpy(default_group_str, "root");
 169
 170         return default_group_str;
 171 }
 172
 173 /* extract possible {attr} and move str behind it */
 174 static char *get_format_attribute(char **str)
 175 {
 176         char *pos;
 177         char *attr = NULL;
 178
 179         if (*str[0] == '{') {
 180                 pos = strchr(*str, '}');
 181                 if (pos == NULL) {
 182                         dbg("missing closing brace for format");
 183                         return NULL;
 184                 }
 185                 pos[0] = '\0';
 186                 attr = *str+1;
 187                 *str = pos+1;
 188                 dbg("attribute='%s', str='%s'", attr, *str);
 189         }
 190         return attr;
 191 }
 192
 193 /* extract possible format length and move str behind it*/
 194 static int get_format_len(char **str)
 195 {
 196         int num;
 197         char *tail;
 198
 199         if (isdigit(*str[0])) {
 200                 num = (int) strtoul(*str, &tail, 10);
 201                 if (tail != NULL) {
 202                         *str = tail;
 203                         dbg("format length=%i", num);
 204                         return num;
 205                 } else {
 206                         dbg("format parsing error '%s'", *str);
 207                 }
 208         }
 209         return -1;
 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 temp1[NAME_SIZE];
 218         char *tail;
 219         char *pos;
 220         char *pos2;
 221         char *pos3;
 222         char *attr;
 223         int num;
 224         int i;
 225         char c;
 226         struct sysfs_attribute *tmpattr;
 227
 228         pos = string;
 229
 230         while (1) {
 231                 pos = strchr(string, '%');
 232                 if (pos != NULL) {
 233                         pos[0] = '\0';
 234                         tail = pos+1;
 235                         num = get_format_len(&tail);
 236                         c = tail[0];
 237                         strfieldcpy(temp, tail+1);
 238                         tail = temp;
 239                 } else {
 240                         break;
 241                 }
 242                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 243
 244                 attr = get_format_attribute(&tail);
 245
 246                 switch (c) {
 247                 case 'b':
 248                         if (strlen(udev->bus_id) == 0)
 249                                 break;
 250                         strnfieldcat(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                         strnfieldcat(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                         strnfieldcat(string, udev->kernel_number, maxsize);
 263                         dbg("substitute kernel number '%s'", udev->kernel_number);
 264                                 break;
 265                 case 'm':
 266                         strnintcat(string, udev->minor, maxsize);
 267                         dbg("substitute minor number '%u'", udev->minor);
 268                         break;
 269                 case 'M':
 270                         strnintcat(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 = num; /* num syntax is deprecated and will be removed  */
 278                         if (attr != NULL)
 279                                 i = atoi(attr);
 280                         if (i > 0) {
 281                                 strfieldcpy(temp1, udev->program_result);
 282                                 pos2 = temp1;
 283                                 while (i) {
 284                                         i--;
 285                                         pos3 = strsep(&pos2, " ");
 286                                         if (pos3 == NULL) {
 287                                                 dbg("requested part of result string not found");
 288                                                 break;
 289                                         }
 290                                 }
 291                                 if (pos3) {
 292                                         strnfieldcat(string, pos3, maxsize);
 293                                         dbg("substitute part of result string '%s'", pos3);
 294                                 }
 295                         } else {
 296                                 strnfieldcat(string, udev->program_result, maxsize);
 297                                 dbg("substitute result string '%s'", udev->program_result);
 298                         }
 299                         break;
 300                 case 's':
 301                         if (attr != NULL) {
 302                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 303                                 if (tmpattr == NULL) {
 304                                         dbg("sysfa attribute '%s' not found", attr);
 305                                         break;
 306                                 }
 307                                 strnfieldcat(string, tmpattr->value, maxsize);
 308                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 309                         } else {
 310                                 dbg("missing attribute");
 311                         }
 312                         break;
 313                 case '%':
 314                         strnfieldcat(string, "%", maxsize);
 315                         break;
 316                 default:
 317                         dbg("unknown substitution type '%%%c'", c);
 318                         break;
 319                 }
 320                 strnfieldcat(string, tail, maxsize);
 321         }
 322 }
 323
 324 /*
 325  * Note, we can have multiple files for different busses in here due
 326  * to the mess that USB has for its device tree...
 327  */
 328 static struct bus_file {
 329         char *bus;
 330         char *file;
 331 } bus_files[] = {
 332         { .bus = "scsi",        .file = "vendor" },
 333         { .bus = "usb",         .file = "idVendor" },
 334         { .bus = "usb",         .file = "iInterface" },
 335         { .bus = "usb-serial",  .file = "detach_state" },
 336         { .bus = "ide",         .file = "detach_state" },
 337         { .bus = "pci",         .file = "vendor" },
 338         {}
 339 };
 340
 341 #define SECONDS_TO_WAIT_FOR_FILE        10
 342 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 343 {
 344         /* sleep until we see the file for this specific bus type show up this
 345          * is needed because we can easily out-run the kernel in looking for
 346          * these files before the paticular subsystem has created them in the
 347          * sysfs tree properly.
 348          *
 349          * And people thought that the /sbin/hotplug event system was going to
 350          * be slow, poo on you for arguing that before even testing it...
 351          */
 352         struct bus_file *b = &bus_files[0];
 353         struct sysfs_attribute *tmpattr;
 354         int found = 0;
 355         int loop = SECONDS_TO_WAIT_FOR_FILE;
 356
 357         while (1) {
 358                 if (b->bus == NULL) {
 359                         if (!found)
 360                                 break;
 361                         /* sleep to give the kernel a chance to create the file */
 362                         sleep(1);
 363                         --loop;
 364                         if (loop == 0)
 365                                 break;
 366                         b = &bus_files[0];
 367                 }
 368                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 369                         found = 1;
 370                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 371                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 372                         if (tmpattr) {
 373                                 /* found it! */
 374                                 goto exit;
 375                         }
 376                         dbg("can't find '%s' file", b->file);
 377                 }
 378                 ++b;
 379         }
 380         if (!found)
 381                 dbg("did not find bus type '%s' on list of bus_id_files, "
 382                     "contact greg@kroah.com", sysfs_device->bus);
 383 exit:
 384         return; /* here to prevent compiler warning... */
 385 }
 386
 387 static void fix_kernel_name(struct udevice *udev)
 388 {
 389         char *temp = udev->kernel_name;
 390
 391         while (*temp != 0x00) {
 392                 /* Some block devices have a ! in their name,
 393                  * we need to change that to / */
 394                 if (*temp == '!')
 395                         *temp = '/';
 396                 ++temp;
 397         }
 398 }
 399
 400 static int execute_program(char *path, char *value, int len)
 401 {
 402         int retval;
 403         int res;
 404         int status;
 405         int fds[2];
 406         pid_t pid;
 407         int value_set = 0;
 408         char buffer[255];
 409         char *pos;
 410         char *args[PROGRAM_MAXARG];
 411         int i;
 412
 413         dbg("executing '%s'", path);
 414         retval = pipe(fds);
 415         if (retval != 0) {
 416                 dbg("pipe failed");
 417                 return -1;
 418         }
 419         pid = fork();
 420         switch(pid) {
 421         case 0:
 422                 /* child */
 423                 close(STDOUT_FILENO);
 424
 425                 /* dup write side of pipe to STDOUT */
 426                 dup(fds[1]);
 427
 428                 /* copy off our path to use incase we have too many args */
 429                 strnfieldcpy(buffer, path, sizeof(buffer));
 430
 431                 if (strchr(path, ' ')) {
 432                         /* exec with arguments */
 433                         pos = path;
 434                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 435                                 args[i] = strsep(&pos, " ");
 436                                 if (args[i] == NULL)
 437                                         break;
 438                         }
 439                         if (args[i]) {
 440                                 dbg("too many args - %d, using subshell instead '%s'", i, buffer);
 441                                 retval = execl("/bin/sh", "sh", "-c", buffer, NULL);
 442                         } else {
 443                                 dbg("execute program '%s'", path);
 444                                 retval = execv(args[0], args);
 445                         }
 446                 } else {
 447                         retval = execv(path, main_argv);
 448                 }
 449                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 450                 exit(1);
 451         case -1:
 452                 dbg("fork failed");
 453                 return -1;
 454         default:
 455                 /* parent reads from fds[0] */
 456                 close(fds[1]);
 457                 retval = 0;
 458                 while (1) {
 459                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 460                         if (res <= 0)
 461                                 break;
 462                         buffer[res] = '\0';
 463                         if (res > len) {
 464                                 dbg("result len %d too short", len);
 465                                 retval = -1;
 466                         }
 467                         if (value_set) {
 468                                 dbg("result value already set");
 469                                 retval = -1;
 470                         } else {
 471                                 value_set = 1;
 472                                 strncpy(value, buffer, len);
 473                                 pos = value + strlen(value)-1;
 474                                 if (pos[0] == '\n')
 475                                         pos[0] = '\0';
 476                                 dbg("result is '%s'", value);
 477                         }
 478                 }
 479                 close(fds[0]);
 480                 res = wait(&status);
 481                 if (res < 0) {
 482                         dbg("wait failed result %d", res);
 483                         retval = -1;
 484                 }
 485
 486                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 487                         dbg("exec program status 0x%x", status);
 488                         retval = -1;
 489                 }
 490         }
 491         return retval;
 492 }
 493
 494 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 495 {
 496         struct sysfs_attribute *tmpattr = NULL;
 497         char *c;
 498
 499         dbg("look for device attribute '%s'", attr);
 500         /* try to find the attribute in the class device directory */
 501         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 502         if (tmpattr)
 503                 goto attr_found;
 504
 505         /* look in the class device directory if present */
 506         if (sysfs_device) {
 507                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 508                 if (tmpattr)
 509                         goto attr_found;
 510         }
 511
 512         return NULL;
 513
 514 attr_found:
 515         c = strchr(tmpattr->value, '\n');
 516         if (c != NULL)
 517                 c[0] = '\0';
 518
 519         dbg("found attribute '%s'", tmpattr->path);
 520         return tmpattr;
 521 }
 522
 523 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 524 {
 525         struct sysfs_attribute *tmpattr;
 526
 527         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 528                 return -ENODEV;
 529
 530         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 531         if (tmpattr == NULL)
 532                 return -ENODEV;
 533
 534         dbg("compare attribute '%s' value '%s' with '%s'",
 535                   pair->file, tmpattr->value, pair->value);
 536         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 537                 return -ENODEV;
 538
 539         dbg("found matching attribute '%s' with value '%s'",
 540             pair->file, pair->value);
 541         return 0;
 542 }
 543
 544 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 545 {
 546         struct sysfs_pair *pair;
 547         int i;
 548
 549         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 550                 pair = &dev->sysfs_pair[i];
 551                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 552                         break;
 553                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 554                         dbg("sysfs attribute doesn't match");
 555                         return -ENODEV;
 556                 }
 557         }
 558
 559         return 0;
 560 }
 561
 562 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 563 {
 564         char path[SYSFS_PATH_MAX];
 565         char *temp = NULL;
 566
 567         /* we have to have a sysfs device for ID to work */
 568         if (!sysfs_device)
 569                 return -ENODEV;
 570
 571         strfieldcpy(path, sysfs_device->path);
 572         temp = strrchr(path, '/');
 573         temp++;
 574         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 575         if (strcmp_pattern(dev->id, temp) != 0)
 576                 return -ENODEV;
 577         else
 578                 return 0;
 579 }
 580
 581 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 582 {
 583         char path[SYSFS_PATH_MAX];
 584         int found;
 585         char *temp = NULL;
 586
 587         /* we have to have a sysfs device for PLACE to work */
 588         if (!sysfs_device)
 589                 return -ENODEV;
 590
 591         found = 0;
 592         strfieldcpy(path, sysfs_device->path);
 593         temp = strrchr(path, '/');
 594         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 595         if (strstr(temp, dev->place) != NULL) {
 596                 found = 1;
 597         } else {
 598                 *temp = 0x00;
 599                 temp = strrchr(path, '/');
 600                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 601                 if (strstr(temp, dev->place) != NULL)
 602                         found = 1;
 603         }
 604         if (!found) {
 605                 dbg("place doesn't match");
 606                 return -ENODEV;
 607         }
 608
 609         return 0;
 610 }
 611
 612 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 613 {
 614         struct sysfs_device *sysfs_device;
 615         struct sysfs_class_device *class_dev_parent;
 616         struct timespec tspec;
 617         int loop;
 618
 619         /* Figure out where the device symlink is at.  For char devices this will
 620          * always be in the class_dev->path.  But for block devices, it's different.
 621          * The main block device will have the device symlink in it's path, but
 622          * all partitions have the symlink in its parent directory.
 623          * But we need to watch out for block devices that do not have parents, yet
 624          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 625          * symlink yet.  We do sit and spin on waiting for them right now, we should
 626          * possibly have a whitelist for these devices here...
 627          */
 628         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 629         if (class_dev_parent)
 630                 dbg("Really a partition");
 631
 632         tspec.tv_sec = 0;
 633         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 634         loop = 10;
 635         while (loop--) {
 636                 if (udev_sleep)
 637                         nanosleep(&tspec, NULL);
 638                 if (class_dev_parent)
 639                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 640                 else
 641                         sysfs_device = sysfs_get_classdev_device(class_dev);
 642
 643                 if (sysfs_device != NULL)
 644                         goto device_found;
 645         }
 646         dbg("timed out waiting for device symlink, continuing on anyway...");
 647
 648 device_found:
 649         /* We have another issue with just the wait above - the sysfs part of
 650          * the kernel may not be quick enough to have created the link to the
 651          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 652          * will not contain the actual bus name :(
 653          *
 654          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 655          * if needed
 656          */
 657         if (sysfs_device) {
 658                 if (sysfs_device->bus[0] != '\0')
 659                         goto bus_found;
 660
 661                 loop = 10;
 662                 tspec.tv_nsec = 10000000;
 663                 while (loop--) {
 664                         if (udev_sleep)
 665                                 nanosleep(&tspec, NULL);
 666                         sysfs_get_device_bus(sysfs_device);
 667
 668                         if (sysfs_device->bus[0] != '\0')
 669                                 goto bus_found;
 670                 }
 671                 dbg("timed out waiting to find the device bus, continuing on anyway");
 672                 goto exit;
 673 bus_found:
 674                 dbg("device %s is registered with bus '%s'",
 675                                 sysfs_device->name, sysfs_device->bus);
 676         }
 677 exit:
 678         return sysfs_device;
 679 }
 680
 681 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 682 {
 683         while (1) {
 684                 /* check for matching bus value */
 685                 if (dev->bus[0] != '\0') {
 686                         if (sysfs_device == NULL) {
 687                                 dbg("device has no bus");
 688                                 goto try_parent;
 689                         }
 690                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 691                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 692                                 dbg(FIELD_BUS " is not matching");
 693                                 goto try_parent;
 694                         } else {
 695                                 dbg(FIELD_BUS " matches");
 696                         }
 697                 }
 698
 699                 /* check for matching kernel name*/
 700                 if (dev->kernel[0] != '\0') {
 701                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 702                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 703                                 dbg(FIELD_KERNEL " is not matching");
 704                                 goto try_parent;
 705                         } else {
 706                                 dbg(FIELD_KERNEL " matches");
 707                         }
 708                 }
 709
 710                 /* check for matching bus id */
 711                 if (dev->id[0] != '\0') {
 712                         dbg("check " FIELD_ID);
 713                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 714                                 dbg(FIELD_ID " is not matching");
 715                                 goto try_parent;
 716                         } else {
 717                                 dbg(FIELD_ID " matches");
 718                         }
 719                 }
 720
 721                 /* check for matching place of device */
 722                 if (dev->place[0] != '\0') {
 723                         dbg("check " FIELD_PLACE);
 724                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 725                                 dbg(FIELD_PLACE " is not matching");
 726                                 goto try_parent;
 727                         } else {
 728                                 dbg(FIELD_PLACE " matches");
 729                         }
 730                 }
 731
 732                 /* check for matching sysfs pairs */
 733                 if (dev->sysfs_pair[0].file[0] != '\0') {
 734                         dbg("check " FIELD_SYSFS " pairs");
 735                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 736                                 dbg(FIELD_SYSFS " is not matching");
 737                                 goto try_parent;
 738                         } else {
 739                                 dbg(FIELD_SYSFS " matches");
 740                         }
 741                 }
 742
 743                 /* execute external program */
 744                 if (dev->program[0] != '\0') {
 745                         dbg("check " FIELD_PROGRAM);
 746                         apply_format(udev, dev->program, sizeof(dev->program),
 747                                      class_dev, sysfs_device);
 748                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 749                                 dbg(FIELD_PROGRAM " returned nozero");
 750                                 goto try_parent;
 751                         } else {
 752                                 dbg(FIELD_PROGRAM " returned successful");
 753                         }
 754                 }
 755
 756                 /* check for matching result of external program */
 757                 if (dev->result[0] != '\0') {
 758                         dbg("check for " FIELD_RESULT
 759                             " dev->result='%s', udev->program_result='%s'",
 760                             dev->result, udev->program_result);
 761                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 762                                 dbg(FIELD_RESULT " is not matching");
 763                                 goto try_parent;
 764                         } else {
 765                                 dbg(FIELD_RESULT " matches");
 766                         }
 767                 }
 768
 769                 /* Yeah, we matched! */
 770                 return 0;
 771
 772 try_parent:
 773                 dbg("try parent sysfs device");
 774                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 775                 if (sysfs_device == NULL)
 776                         return -ENODEV;
 777                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 778                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 779                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 780         }
 781
 782 }
 783
 784 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 785 {
 786         struct sysfs_device *sysfs_device = NULL;
 787         struct config_device *dev;
 788         struct perm_device *perm;
 789         char *pos;
 790
 791         udev->mode = 0;
 792
 793         /* find the sysfs_device associated with this class device */
 794         sysfs_device = get_sysfs_device(class_dev);
 795         if (sysfs_device) {
 796                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 797                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 798                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 799                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 800                 wait_for_device_to_initialize(sysfs_device);
 801         }
 802         dbg("class_dev->name = '%s'", class_dev->name);
 803
 804         strfieldcpy(udev->kernel_name, class_dev->name);
 805         fix_kernel_name(udev);
 806         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 807
 808         /* get kernel number */
 809         pos = class_dev->name + strlen(class_dev->name);
 810         while (isdigit(*(pos-1)))
 811                 pos--;
 812         strfieldcpy(udev->kernel_number, pos);
 813         dbg("kernel_number='%s'", udev->kernel_number);
 814
 815         /* look for a matching rule to apply */
 816         list_for_each_entry(dev, &config_device_list, node) {
 817                 dbg("process rule");
 818                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 819                         if (dev->name[0] == '\0') {
 820                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 821                                      udev_rules_filename, dev->config_line, udev->kernel_name);
 822                                 return -1;
 823                         }
 824
 825                         info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 826                              udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
 827                         strfieldcpy(udev->name, dev->name);
 828                         strfieldcpy(udev->symlink, dev->symlink);
 829                         goto found;
 830                 }
 831         }
 832
 833         /* no rule was found so we use the kernel name */
 834         strfieldcpy(udev->name, udev->kernel_name);
 835         goto done;
 836
 837 found:
 838         /* substitute placeholder */
 839         apply_format(udev, udev->name, sizeof(udev->name),
 840                      class_dev, sysfs_device);
 841         apply_format(udev, udev->symlink, sizeof(udev->symlink),
 842                      class_dev, sysfs_device);
 843         udev->partitions = dev->partitions;
 844 done:
 845         perm = find_perm(udev->name);
 846         if (perm) {
 847                 udev->mode = perm->mode;
 848                 strfieldcpy(udev->owner, perm->owner);
 849                 strfieldcpy(udev->group, perm->group);
 850         } else {
 851                 /* no matching perms found :( */
 852                 udev->mode = get_default_mode();
 853                 strfieldcpy(udev->owner, get_default_owner());
 854                 strfieldcpy(udev->group, get_default_group());
 855         }
 856         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 857             udev->name, udev->owner, udev->group, udev->mode);
 858
 859         return 0;
 860 }
 861
 862 int namedev_init(void)
 863 {
 864         int retval;
 865
 866         retval = namedev_init_rules();
 867         if (retval)
 868                 return retval;
 869
 870         retval = namedev_init_permissions();
 871         if (retval)
 872                 return retval;
 873
 874         dump_config_dev_list();
 875         dump_perm_dev_list();
 876         return retval;
 877 }