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 "list.h"
  37 #include "udev.h"
  38 #include "udev_version.h"
  39 #include "namedev.h"
  40 #include "libsysfs/libsysfs.h"
  41 #include "klibc_fixups.h"
  42
  43 LIST_HEAD(config_device_list);
  44 LIST_HEAD(perm_device_list);
  45
  46 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  47 static int strcmp_pattern(const char *p, const char *s)
  48 {
  49         if (*s == '\0') {
  50                 while (*p == '*')
  51                         p++;
  52                 return (*p != '\0');
  53         }
  54         switch (*p) {
  55         case '[':
  56                 {
  57                         int not = 0;
  58                         p++;
  59                         if (*p == '!') {
  60                                 not = 1;
  61                                 p++;
  62                         }
  63                         while (*p && (*p != ']')) {
  64                                 int match = 0;
  65                                 if (p[1] == '-') {
  66                                         if ((*s >= *p) && (*s <= p[2]))
  67                                                 match = 1;
  68                                         p += 3;
  69                                 } else {
  70                                         match = (*p == *s);
  71                                         p++;
  72                                 }
  73                                 if (match ^ not) {
  74                                         while (*p && (*p != ']'))
  75                                                 p++;
  76                                         return strcmp_pattern(p+1, s+1);
  77                                 }
  78                         }
  79                 }
  80                 break;
  81         case '*':
  82                 if (strcmp_pattern(p, s+1))
  83                         return strcmp_pattern(p+1, s);
  84                 return 0;
  85         case '\0':
  86                 if (*s == '\0') {
  87                         return 0;
  88                 }
  89                 break;
  90         default:
  91                 if ((*p == *s) || (*p == '?'))
  92                         return strcmp_pattern(p+1, s+1);
  93                 break;
  94         }
  95         return 1;
  96 }
  97
  98 #define copy_var(a, b, var)             \
  99         if (b->var)                     \
 100                 a->var = b->var;
 101
 102 #define copy_string(a, b, var)          \
 103         if (strlen(b->var))             \
 104                 strcpy(a->var, b->var);
 105
 106 int add_perm_dev(struct perm_device *new_dev)
 107 {
 108         struct perm_device *dev;
 109         struct perm_device *tmp_dev;
 110
 111         /* update the values if we already have the device */
 112         list_for_each_entry(dev, &perm_device_list, node) {
 113                 if (strcmp_pattern(new_dev->name, dev->name))
 114                         continue;
 115                 copy_var(dev, new_dev, mode);
 116                 copy_string(dev, new_dev, owner);
 117                 copy_string(dev, new_dev, group);
 118                 return 0;
 119         }
 120
 121         /* not found, add new structure to the perm list */
 122         tmp_dev = malloc(sizeof(*tmp_dev));
 123         if (!tmp_dev)
 124                 return -ENOMEM;
 125         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 126         list_add_tail(&tmp_dev->node, &perm_device_list);
 127         //dump_perm_dev(tmp_dev);
 128         return 0;
 129 }
 130
 131 static struct perm_device *find_perm(char *name)
 132 {
 133         struct perm_device *perm;
 134
 135         list_for_each_entry(perm, &perm_device_list, node) {
 136                 if (strcmp_pattern(perm->name, name))
 137                         continue;
 138                 return perm;
 139         }
 140         return NULL;
 141 }
 142
 143 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 144 {
 145         mode_t mode = 0600;     /* default to owner rw only */
 146
 147         if (strlen(default_mode_str) != 0) {
 148                 mode = strtol(default_mode_str, NULL, 8);
 149         }
 150         return mode;
 151 }
 152
 153 static void apply_format(struct udevice *udev, unsigned char *string)
 154 {
 155         char temp[NAME_SIZE];
 156         char temp1[NAME_SIZE];
 157         char *tail;
 158         char *pos;
 159         char *pos2;
 160         char *pos3;
 161         int num;
 162
 163         pos = string;
 164         while (1) {
 165                 num = 0;
 166                 pos = strchr(pos, '%');
 167
 168                 if (pos) {
 169                         pos[0] = '\0';
 170                         tail = pos+1;
 171                         if (isdigit(tail[0])) {
 172                                 num = (int) strtoul(&pos[1], &tail, 10);
 173                                 if (tail == NULL) {
 174                                         dbg("format parsing error '%s'", pos+1);
 175                                         break;
 176                                 }
 177                         }
 178                         strfieldcpy(temp, tail+1);
 179
 180                         switch (tail[0]) {
 181                         case 'b':
 182                                 if (strlen(udev->bus_id) == 0)
 183                                         break;
 184                                 strcat(pos, udev->bus_id);
 185                                 dbg("substitute bus_id '%s'", udev->bus_id);
 186                                 break;
 187                         case 'k':
 188                                 if (strlen(udev->kernel_name) == 0)
 189                                         break;
 190                                 strcat(pos, udev->kernel_name);
 191                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 192                                 break;
 193                         case 'n':
 194                                 if (strlen(udev->kernel_number) == 0)
 195                                         break;
 196                                 strcat(pos, udev->kernel_number);
 197                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 198                                 break;
 199                         case 'm':
 200                                 sprintf(pos, "%u", udev->minor);
 201                                 dbg("substitute minor number '%u'", udev->minor);
 202                                 break;
 203                         case 'M':
 204                                 sprintf(pos, "%u", udev->major);
 205                                 dbg("substitute major number '%u'", udev->major);
 206                                 break;
 207                         case 'c':
 208                                 if (strlen(udev->program_result) == 0)
 209                                         break;
 210                                 if (num) {
 211                                         /* get part of return string */
 212                                         strncpy(temp1, udev->program_result, sizeof(temp1));
 213                                         pos2 = temp1;
 214                                         while (num) {
 215                                                 num--;
 216                                                 pos3 = strsep(&pos2, " ");
 217                                                 if (pos3 == NULL) {
 218                                                         dbg("requested part of result string not found");
 219                                                         break;
 220                                                 }
 221                                         }
 222                                         if (pos3) {
 223                                                 strcat(pos, pos3);
 224                                                 dbg("substitute part of result string '%s'", pos3);
 225                                         }
 226                                 } else {
 227                                         strcat(pos, udev->program_result);
 228                                         dbg("substitute result string '%s'", udev->program_result);
 229                                 }
 230                                 break;
 231                         case '%':
 232                                 strcat(pos, "%");
 233                                 pos++;
 234                                 break;
 235                         default:
 236                                 dbg("unknown substitution type '%%%c'", pos[1]);
 237                                 break;
 238                         }
 239                         strcat(string, temp);
 240                 } else
 241                         break;
 242         }
 243 }
 244
 245 static struct bus_file {
 246         char *bus;
 247         char *file;
 248 } bus_files[] = {
 249         { .bus = "scsi",        .file = "vendor" },
 250         { .bus = "usb",         .file = "idVendor" },
 251         { .bus = "usb-serial",  .file = "detach_state" },
 252         { .bus = "ide",         .file = "detach_state" },
 253         { .bus = "pci",         .file = "vendor" },
 254         {}
 255 };
 256
 257 #define SECONDS_TO_WAIT_FOR_FILE        10
 258 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 259 {
 260         /* sleep until we see the file for this specific bus type show up this
 261          * is needed because we can easily out-run the kernel in looking for
 262          * these files before the paticular subsystem has created them in the
 263          * sysfs tree properly.
 264          *
 265          * And people thought that the /sbin/hotplug event system was going to
 266          * be slow, poo on you for arguing that before even testing it...
 267          */
 268         struct bus_file *b = &bus_files[0];
 269         struct sysfs_attribute *tmpattr;
 270         int loop;
 271
 272         while (1) {
 273                 if (b->bus == NULL)
 274                         break;
 275                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 276                         tmpattr = NULL;
 277                         loop = SECONDS_TO_WAIT_FOR_FILE;
 278                         while (loop--) {
 279                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 280                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 281                                 if (tmpattr) {
 282                                         /* found it! */
 283                                         goto exit;
 284                                 }
 285                                 /* sleep to give the kernel a chance to create the file */
 286                                 sleep(1);
 287                         }
 288                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 289                         goto exit;
 290                 }
 291                 b++;
 292         }
 293         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 294 exit:
 295         return; /* here to prevent compiler warning... */
 296 }
 297
 298 static int execute_program(char *path, char *value, int len)
 299 {
 300         int retval;
 301         int res;
 302         int status;
 303         int fds[2];
 304         pid_t pid;
 305         int value_set = 0;
 306         char buffer[256];
 307         char *pos;
 308         char *args[PROGRAM_MAXARG];
 309         int i;
 310
 311         dbg("executing '%s'", path);
 312         retval = pipe(fds);
 313         if (retval != 0) {
 314                 dbg("pipe failed");
 315                 return -1;
 316         }
 317         pid = fork();
 318         if (pid == -1) {
 319                 dbg("fork failed");
 320                 return -1;
 321         }
 322
 323         if (pid == 0) {
 324                 /* child */
 325                 close(STDOUT_FILENO);
 326                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 327                 if (strchr(path, ' ')) {
 328                         /* exec with arguments */
 329                         pos = path;
 330                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 331                                 args[i] = strsep(&pos, " ");
 332                                 if (args[i] == NULL)
 333                                         break;
 334                         }
 335                         if (args[i]) {
 336                                 dbg("too many args - %d", i);
 337                                 args[i] = NULL;
 338                         }
 339                         retval = execve(args[0], args, main_envp);
 340                 } else {
 341                         retval = execve(path, main_argv, main_envp);
 342                 }
 343                 if (retval != 0) {
 344                         dbg("child execve failed");
 345                         exit(1);
 346                 }
 347                 return -1; /* avoid compiler warning */
 348         } else {
 349                 /* parent reads from fds[0] */
 350                 close(fds[1]);
 351                 retval = 0;
 352                 while (1) {
 353                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 354                         if (res <= 0)
 355                                 break;
 356                         buffer[res] = '\0';
 357                         if (res > len) {
 358                                 dbg("result len %d too short", len);
 359                                 retval = -1;
 360                         }
 361                         if (value_set) {
 362                                 dbg("result value already set");
 363                                 retval = -1;
 364                         } else {
 365                                 value_set = 1;
 366                                 strncpy(value, buffer, len);
 367                                 pos = value + strlen(value)-1;
 368                                 if (pos[0] == '\n')
 369                                 pos[0] = '\0';
 370                                 dbg("result is '%s'", value);
 371                         }
 372                 }
 373                 close(fds[0]);
 374                 res = wait(&status);
 375                 if (res < 0) {
 376                         dbg("wait failed result %d", res);
 377                         retval = -1;
 378                 }
 379
 380                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 381                         dbg("exec program status 0x%x", status);
 382                         retval = -1;
 383                 }
 384         }
 385         return retval;
 386 }
 387
 388 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 389 {
 390         struct sysfs_attribute *tmpattr = NULL;
 391         char *c;
 392
 393         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 394                 return -ENODEV;
 395
 396         dbg("look for device attribute '%s'", pair->file);
 397         /* try to find the attribute in the class device directory */
 398         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 399         if (tmpattr)
 400                 goto label_found;
 401
 402         /* look in the class device directory if present */
 403         if (sysfs_device) {
 404                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 405                 if (tmpattr)
 406                         goto label_found;
 407         }
 408         return -ENODEV;
 409
 410 label_found:
 411         c = tmpattr->value + strlen(tmpattr->value)-1;
 412         if (*c == '\n')
 413                 *c = 0x00;
 414         dbg("compare attribute '%s' value '%s' with '%s'",
 415                   pair->file, tmpattr->value, pair->value);
 416         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 417                 return -ENODEV;
 418
 419         dbg("found matching attribute '%s' with value '%s'",
 420             pair->file, pair->value);
 421         return 0;
 422 }
 423
 424 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 425 {
 426         struct sysfs_pair *pair;
 427         int i;
 428
 429         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 430                 pair = &dev->sysfs_pair[i];
 431                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 432                         break;
 433                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 434                         dbg("sysfs attribute doesn't match");
 435                         return -ENODEV;
 436                 }
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 443 {
 444         char path[SYSFS_PATH_MAX];
 445         int found;
 446         char *temp = NULL;
 447
 448         /* we have to have a sysfs device for ID to work */
 449         if (!sysfs_device)
 450                 return -ENODEV;
 451
 452         found = 0;
 453         strfieldcpy(path, sysfs_device->path);
 454         temp = strrchr(path, '/');
 455         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 456         if (strstr(temp, dev->id) != NULL) {
 457                 found = 1;
 458         } else {
 459                 *temp = 0x00;
 460                 temp = strrchr(path, '/');
 461                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 462                 if (strstr(temp, dev->id) != NULL)
 463                         found = 1;
 464         }
 465         if (!found) {
 466                 dbg("id doesn't match");
 467                 return -ENODEV;
 468         }
 469
 470         return 0;
 471 }
 472
 473 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 474 {
 475         char path[SYSFS_PATH_MAX];
 476         int found;
 477         char *temp = NULL;
 478
 479         /* we have to have a sysfs device for PLACE to work */
 480         if (!sysfs_device)
 481                 return -ENODEV;
 482
 483         found = 0;
 484         strfieldcpy(path, sysfs_device->path);
 485         temp = strrchr(path, '/');
 486         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 487         if (strstr(temp, dev->place) != NULL) {
 488                 found = 1;
 489         } else {
 490                 *temp = 0x00;
 491                 temp = strrchr(path, '/');
 492                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 493                 if (strstr(temp, dev->place) != NULL)
 494                         found = 1;
 495         }
 496         if (!found) {
 497                 dbg("place doesn't match");
 498                 return -ENODEV;
 499         }
 500
 501         return 0;
 502 }
 503
 504 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 505 {
 506         struct sysfs_device *sysfs_device;
 507         struct sysfs_class_device *class_dev_parent;
 508         struct timespec tspec;
 509         int loop;
 510
 511         /* Figure out where the device symlink is at.  For char devices this will
 512          * always be in the class_dev->path.  But for block devices, it's different.
 513          * The main block device will have the device symlink in it's path, but
 514          * all partitions have the symlink in its parent directory.
 515          * But we need to watch out for block devices that do not have parents, yet
 516          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 517          * symlink yet.  We do sit and spin on waiting for them right now, we should
 518          * possibly have a whitelist for these devices here...
 519          */
 520         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 521         if (class_dev_parent)
 522                 dbg("Really a partition");
 523
 524         tspec.tv_sec = 0;
 525         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 526         loop = 10;
 527         while (loop--) {
 528                 nanosleep(&tspec, NULL);
 529                 if (class_dev_parent)
 530                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 531                 else
 532                         sysfs_device = sysfs_get_classdev_device(class_dev);
 533
 534                 if (sysfs_device != NULL)
 535                         goto device_found;
 536         }
 537         dbg("Timed out waiting for device symlink, continuing on anyway...");
 538
 539 device_found:
 540         /* We have another issue with just the wait above - the sysfs part of
 541          * the kernel may not be quick enough to have created the link to the
 542          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 543          * will not contain the actual bus name :(
 544          *
 545          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 546          * if needed
 547          */
 548         if (sysfs_device) {
 549
 550                 if (sysfs_device->bus[0] != '\0')
 551                         goto bus_found;
 552
 553                 loop = 10;
 554                 tspec.tv_nsec = 10000000;
 555                 while (loop--) {
 556                         nanosleep(&tspec, NULL);
 557                         sysfs_get_device_bus(sysfs_device);
 558
 559                         if (sysfs_device->bus[0] != '\0')
 560                                 goto bus_found;
 561                 }
 562                 dbg("Timed out waiting to find the device bus, continuing on anyway\n");
 563                 goto exit;
 564 bus_found:
 565                 dbg("Device %s is registered with bus %s\n",
 566                                 sysfs_device->name, sysfs_device->bus);
 567         }
 568 exit:
 569         return sysfs_device;
 570 }
 571
 572 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 573 {
 574         struct sysfs_device *sysfs_device = NULL;
 575         struct config_device *dev;
 576         struct perm_device *perm;
 577         char *pos;
 578
 579         udev->mode = 0;
 580
 581         /* find the sysfs_device associated with this class device */
 582         sysfs_device = get_sysfs_device(class_dev);
 583         if (sysfs_device) {
 584                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 585                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 586                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 587                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 588                 wait_for_device_to_initialize(sysfs_device);
 589         } else {
 590                 dbg("class_dev->name = '%s'", class_dev->name);
 591         }
 592
 593         strfieldcpy(udev->kernel_name, class_dev->name);
 594
 595         /* get kernel number */
 596         pos = class_dev->name + strlen(class_dev->name);
 597         while (isdigit(*(pos-1)))
 598                 pos--;
 599         strfieldcpy(udev->kernel_number, pos);
 600         dbg("kernel_number='%s'", udev->kernel_number);
 601
 602         /* look for a matching rule to apply */
 603         list_for_each_entry(dev, &config_device_list, node) {
 604                 dbg("process rule");
 605
 606                 /* check for matching bus value */
 607                 if (dev->bus[0] != '\0') {
 608                         if (sysfs_device == NULL) {
 609                                 dbg("device has no bus");
 610                                 continue;
 611                         }
 612                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 613                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 614                                 dbg(FIELD_BUS " is not matching");
 615                                 continue;
 616                         } else {
 617                                 dbg(FIELD_BUS " matches");
 618                         }
 619                 }
 620
 621                 /* check for matching kernel name*/
 622                 if (dev->kernel[0] != '\0') {
 623                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 624                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 625                                 dbg(FIELD_KERNEL " is not matching");
 626                                 continue;
 627                         } else {
 628                                 dbg(FIELD_KERNEL " matches");
 629                         }
 630                 }
 631
 632                 /* check for matching bus id */
 633                 if (dev->id[0] != '\0') {
 634                         dbg("check " FIELD_ID);
 635                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 636                                 dbg(FIELD_ID " is not matching");
 637                                 continue;
 638                         } else {
 639                                 dbg(FIELD_ID " matches");
 640                         }
 641                 }
 642
 643                 /* check for matching place of device */
 644                 if (dev->place[0] != '\0') {
 645                         dbg("check " FIELD_PLACE);
 646                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 647                                 dbg(FIELD_PLACE " is not matching");
 648                                 continue;
 649                         } else {
 650                                 dbg(FIELD_PLACE " matches");
 651                         }
 652                 }
 653
 654                 /* check for matching sysfs pairs */
 655                 if (dev->sysfs_pair[0].file[0] != '\0') {
 656                         dbg("check " FIELD_SYSFS " pairs");
 657                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 658                                 dbg(FIELD_SYSFS " is not matching");
 659                                 continue;
 660                         } else {
 661                                 dbg(FIELD_SYSFS " matches");
 662                         }
 663                 }
 664
 665                 /* execute external program */
 666                 if (dev->program[0] != '\0') {
 667                         dbg("check " FIELD_PROGRAM);
 668                         apply_format(udev, dev->program);
 669                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 670                                 dbg(FIELD_PROGRAM " returned nozero");
 671                                 continue;
 672                         } else {
 673                                 dbg(FIELD_PROGRAM " returned successful");
 674                         }
 675                 }
 676
 677                 /* check for matching result of external program */
 678                 if (dev->result[0] != '\0') {
 679                         dbg("check for " FIELD_RESULT
 680                             " dev->result='%s', udev->program_result='%s'",
 681                             dev->result, udev->program_result);
 682                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 683                                 dbg(FIELD_RESULT " is not matching");
 684                                 continue;
 685                         } else {
 686                                 dbg(FIELD_RESULT " matches");
 687                         }
 688                 }
 689
 690                 /* check if we are instructed to ignore this device */
 691                 if (dev->name[0] == '\0') {
 692                         dbg("instructed to ignore this device");
 693                         return -1;
 694                 }
 695
 696                 /* Yup, this rule belongs to us! */
 697                 dbg("found matching rule, '%s' becomes '%s'", dev->kernel, dev->name);
 698                 strfieldcpy(udev->name, dev->name);
 699                 strfieldcpy(udev->symlink, dev->symlink);
 700                 goto found;
 701         }
 702
 703         /* no rule was found so we use the kernel name */
 704         strfieldcpy(udev->name, class_dev->name);
 705         goto done;
 706
 707 found:
 708         /* substitute placeholder */
 709         apply_format(udev, udev->name);
 710         apply_format(udev, udev->symlink);
 711
 712 done:
 713         perm = find_perm(udev->name);
 714         if (perm) {
 715                 udev->mode = perm->mode;
 716                 strfieldcpy(udev->owner, perm->owner);
 717                 strfieldcpy(udev->group, perm->group);
 718         } else {
 719                 /* no matching perms found :( */
 720                 udev->mode = get_default_mode(class_dev);
 721                 udev->owner[0] = 0x00;
 722                 udev->group[0] = 0x00;
 723         }
 724         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 725             udev->name, udev->owner, udev->group, udev->mode);
 726
 727         return 0;
 728 }
 729
 730 int namedev_init(void)
 731 {
 732         int retval;
 733
 734         retval = namedev_init_rules();
 735         if (retval)
 736                 return retval;
 737
 738         retval = namedev_init_permissions();
 739         if (retval)
 740                 return retval;
 741
 742         dump_config_dev_list();
 743         dump_perm_dev_list();
 744         return retval;
 745 }