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 "logging.h"
  40 #include "namedev.h"
  41 #include "libsysfs/libsysfs.h"
  42 #include "klibc_fixups.h"
  43
  44 LIST_HEAD(config_device_list);
  45 LIST_HEAD(perm_device_list);
  46
  47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  48 static int strcmp_pattern(const char *p, const char *s)
  49 {
  50         if (*s == '\0') {
  51                 while (*p == '*')
  52                         p++;
  53                 return (*p != '\0');
  54         }
  55         switch (*p) {
  56         case '[':
  57                 {
  58                         int not = 0;
  59                         p++;
  60                         if (*p == '!') {
  61                                 not = 1;
  62                                 p++;
  63                         }
  64                         while (*p && (*p != ']')) {
  65                                 int match = 0;
  66                                 if (p[1] == '-') {
  67                                         if ((*s >= *p) && (*s <= p[2]))
  68                                                 match = 1;
  69                                         p += 3;
  70                                 } else {
  71                                         match = (*p == *s);
  72                                         p++;
  73                                 }
  74                                 if (match ^ not) {
  75                                         while (*p && (*p != ']'))
  76                                                 p++;
  77                                         return strcmp_pattern(p+1, s+1);
  78                                 }
  79                         }
  80                 }
  81                 break;
  82         case '*':
  83                 if (strcmp_pattern(p, s+1))
  84                         return strcmp_pattern(p+1, s);
  85                 return 0;
  86         case '\0':
  87                 if (*s == '\0') {
  88                         return 0;
  89                 }
  90                 break;
  91         default:
  92                 if ((*p == *s) || (*p == '?'))
  93                         return strcmp_pattern(p+1, s+1);
  94                 break;
  95         }
  96         return 1;
  97 }
  98
  99 #define copy_var(a, b, var)             \
 100         if (b->var)                     \
 101                 a->var = b->var;
 102
 103 #define copy_string(a, b, var)          \
 104         if (strlen(b->var))             \
 105                 strcpy(a->var, b->var);
 106
 107 int add_perm_dev(struct perm_device *new_dev)
 108 {
 109         struct perm_device *dev;
 110         struct perm_device *tmp_dev;
 111
 112         /* update the values if we already have the device */
 113         list_for_each_entry(dev, &perm_device_list, node) {
 114                 if (strcmp_pattern(new_dev->name, dev->name))
 115                         continue;
 116                 copy_var(dev, new_dev, mode);
 117                 copy_string(dev, new_dev, owner);
 118                 copy_string(dev, new_dev, group);
 119                 return 0;
 120         }
 121
 122         /* not found, add new structure to the perm list */
 123         tmp_dev = malloc(sizeof(*tmp_dev));
 124         if (!tmp_dev)
 125                 return -ENOMEM;
 126         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 127         list_add_tail(&tmp_dev->node, &perm_device_list);
 128         //dump_perm_dev(tmp_dev);
 129         return 0;
 130 }
 131
 132 static struct perm_device *find_perm(char *name)
 133 {
 134         struct perm_device *perm;
 135
 136         list_for_each_entry(perm, &perm_device_list, node) {
 137                 if (strcmp_pattern(perm->name, name))
 138                         continue;
 139                 return perm;
 140         }
 141         return NULL;
 142 }
 143
 144 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 145 {
 146         mode_t mode = 0600;     /* default to owner rw only */
 147
 148         if (strlen(default_mode_str) != 0) {
 149                 mode = strtol(default_mode_str, NULL, 8);
 150         }
 151         return mode;
 152 }
 153
 154 static void apply_format(struct udevice *udev, unsigned char *string)
 155 {
 156         char temp[NAME_SIZE];
 157         char temp1[NAME_SIZE];
 158         char *tail;
 159         char *pos;
 160         char *pos2;
 161         char *pos3;
 162         int num;
 163
 164         pos = string;
 165         while (1) {
 166                 num = 0;
 167                 pos = strchr(pos, '%');
 168
 169                 if (pos) {
 170                         pos[0] = '\0';
 171                         tail = pos+1;
 172                         if (isdigit(tail[0])) {
 173                                 num = (int) strtoul(&pos[1], &tail, 10);
 174                                 if (tail == NULL) {
 175                                         dbg("format parsing error '%s'", pos+1);
 176                                         break;
 177                                 }
 178                         }
 179                         strfieldcpy(temp, tail+1);
 180
 181                         switch (tail[0]) {
 182                         case 'b':
 183                                 if (strlen(udev->bus_id) == 0)
 184                                         break;
 185                                 strcat(pos, udev->bus_id);
 186                                 dbg("substitute bus_id '%s'", udev->bus_id);
 187                                 break;
 188                         case 'k':
 189                                 if (strlen(udev->kernel_name) == 0)
 190                                         break;
 191                                 strcat(pos, udev->kernel_name);
 192                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 193                                 break;
 194                         case 'n':
 195                                 if (strlen(udev->kernel_number) == 0)
 196                                         break;
 197                                 strcat(pos, udev->kernel_number);
 198                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 199                                 break;
 200                         case 'm':
 201                                 sprintf(pos, "%u", udev->minor);
 202                                 dbg("substitute minor number '%u'", udev->minor);
 203                                 break;
 204                         case 'M':
 205                                 sprintf(pos, "%u", udev->major);
 206                                 dbg("substitute major number '%u'", udev->major);
 207                                 break;
 208                         case 'c':
 209                                 if (strlen(udev->program_result) == 0)
 210                                         break;
 211                                 if (num) {
 212                                         /* get part of return string */
 213                                         strncpy(temp1, udev->program_result, sizeof(temp1));
 214                                         pos2 = temp1;
 215                                         while (num) {
 216                                                 num--;
 217                                                 pos3 = strsep(&pos2, " ");
 218                                                 if (pos3 == NULL) {
 219                                                         dbg("requested part of result string not found");
 220                                                         break;
 221                                                 }
 222                                         }
 223                                         if (pos3) {
 224                                                 strcat(pos, pos3);
 225                                                 dbg("substitute part of result string '%s'", pos3);
 226                                         }
 227                                 } else {
 228                                         strcat(pos, udev->program_result);
 229                                         dbg("substitute result string '%s'", udev->program_result);
 230                                 }
 231                                 break;
 232                         case '%':
 233                                 strcat(pos, "%");
 234                                 pos++;
 235                                 break;
 236                         default:
 237                                 dbg("unknown substitution type '%%%c'", pos[1]);
 238                                 break;
 239                         }
 240                         strcat(string, temp);
 241                 } else
 242                         break;
 243         }
 244 }
 245
 246 static struct bus_file {
 247         char *bus;
 248         char *file;
 249 } bus_files[] = {
 250         { .bus = "scsi",        .file = "vendor" },
 251         { .bus = "usb",         .file = "idVendor" },
 252         { .bus = "usb-serial",  .file = "detach_state" },
 253         { .bus = "ide",         .file = "detach_state" },
 254         { .bus = "pci",         .file = "vendor" },
 255         {}
 256 };
 257
 258 #define SECONDS_TO_WAIT_FOR_FILE        10
 259 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 260 {
 261         /* sleep until we see the file for this specific bus type show up this
 262          * is needed because we can easily out-run the kernel in looking for
 263          * these files before the paticular subsystem has created them in the
 264          * sysfs tree properly.
 265          *
 266          * And people thought that the /sbin/hotplug event system was going to
 267          * be slow, poo on you for arguing that before even testing it...
 268          */
 269         struct bus_file *b = &bus_files[0];
 270         struct sysfs_attribute *tmpattr;
 271         int loop;
 272
 273         while (1) {
 274                 if (b->bus == NULL)
 275                         break;
 276                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 277                         tmpattr = NULL;
 278                         loop = SECONDS_TO_WAIT_FOR_FILE;
 279                         while (loop--) {
 280                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 281                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 282                                 if (tmpattr) {
 283                                         /* found it! */
 284                                         goto exit;
 285                                 }
 286                                 /* sleep to give the kernel a chance to create the file */
 287                                 sleep(1);
 288                         }
 289                         dbg("timed out waiting for '%s' file, continuing on anyway...", b->file);
 290                         goto exit;
 291                 }
 292                 b++;
 293         }
 294         dbg("did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 295 exit:
 296         return; /* here to prevent compiler warning... */
 297 }
 298
 299 static int execute_program(char *path, char *value, int len)
 300 {
 301         int retval;
 302         int res;
 303         int status;
 304         int fds[2];
 305         pid_t pid;
 306         int value_set = 0;
 307         char buffer[256];
 308         char *pos;
 309         char *args[PROGRAM_MAXARG];
 310         int i;
 311
 312         dbg("executing '%s'", path);
 313         retval = pipe(fds);
 314         if (retval != 0) {
 315                 dbg("pipe failed");
 316                 return -1;
 317         }
 318         pid = fork();
 319         if (pid == -1) {
 320                 dbg("fork failed");
 321                 return -1;
 322         }
 323
 324         if (pid == 0) {
 325                 /* child */
 326                 close(STDOUT_FILENO);
 327                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 328                 if (strchr(path, ' ')) {
 329                         /* exec with arguments */
 330                         pos = path;
 331                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 332                                 args[i] = strsep(&pos, " ");
 333                                 if (args[i] == NULL)
 334                                         break;
 335                         }
 336                         if (args[i]) {
 337                                 dbg("too many args - %d", i);
 338                                 args[i] = NULL;
 339                         }
 340                         retval = execve(args[0], args, main_envp);
 341                 } else {
 342                         retval = execve(path, main_argv, main_envp);
 343                 }
 344                 if (retval != 0) {
 345                         dbg("child execve failed");
 346                         exit(1);
 347                 }
 348                 return -1; /* avoid compiler warning */
 349         } else {
 350                 /* parent reads from fds[0] */
 351                 close(fds[1]);
 352                 retval = 0;
 353                 while (1) {
 354                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 355                         if (res <= 0)
 356                                 break;
 357                         buffer[res] = '\0';
 358                         if (res > len) {
 359                                 dbg("result len %d too short", len);
 360                                 retval = -1;
 361                         }
 362                         if (value_set) {
 363                                 dbg("result value already set");
 364                                 retval = -1;
 365                         } else {
 366                                 value_set = 1;
 367                                 strncpy(value, buffer, len);
 368                                 pos = value + strlen(value)-1;
 369                                 if (pos[0] == '\n')
 370                                 pos[0] = '\0';
 371                                 dbg("result is '%s'", value);
 372                         }
 373                 }
 374                 close(fds[0]);
 375                 res = wait(&status);
 376                 if (res < 0) {
 377                         dbg("wait failed result %d", res);
 378                         retval = -1;
 379                 }
 380
 381                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 382                         dbg("exec program status 0x%x", status);
 383                         retval = -1;
 384                 }
 385         }
 386         return retval;
 387 }
 388
 389 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 390 {
 391         struct sysfs_attribute *tmpattr = NULL;
 392         char *c;
 393
 394         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 395                 return -ENODEV;
 396
 397         dbg("look for device attribute '%s'", pair->file);
 398         /* try to find the attribute in the class device directory */
 399         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 400         if (tmpattr)
 401                 goto label_found;
 402
 403         /* look in the class device directory if present */
 404         if (sysfs_device) {
 405                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 406                 if (tmpattr)
 407                         goto label_found;
 408         }
 409         return -ENODEV;
 410
 411 label_found:
 412         c = tmpattr->value + strlen(tmpattr->value)-1;
 413         if (*c == '\n')
 414                 *c = 0x00;
 415         dbg("compare attribute '%s' value '%s' with '%s'",
 416                   pair->file, tmpattr->value, pair->value);
 417         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 418                 return -ENODEV;
 419
 420         dbg("found matching attribute '%s' with value '%s'",
 421             pair->file, pair->value);
 422         return 0;
 423 }
 424
 425 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 426 {
 427         struct sysfs_pair *pair;
 428         int i;
 429
 430         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 431                 pair = &dev->sysfs_pair[i];
 432                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 433                         break;
 434                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 435                         dbg("sysfs attribute doesn't match");
 436                         return -ENODEV;
 437                 }
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 444 {
 445         char path[SYSFS_PATH_MAX];
 446         int found;
 447         char *temp = NULL;
 448
 449         /* we have to have a sysfs device for ID to work */
 450         if (!sysfs_device)
 451                 return -ENODEV;
 452
 453         found = 0;
 454         strfieldcpy(path, sysfs_device->path);
 455         temp = strrchr(path, '/');
 456         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 457         if (strstr(temp, dev->id) != NULL) {
 458                 found = 1;
 459         } else {
 460                 *temp = 0x00;
 461                 temp = strrchr(path, '/');
 462                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 463                 if (strstr(temp, dev->id) != NULL)
 464                         found = 1;
 465         }
 466         if (!found) {
 467                 dbg("id doesn't match");
 468                 return -ENODEV;
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 475 {
 476         char path[SYSFS_PATH_MAX];
 477         int found;
 478         char *temp = NULL;
 479
 480         /* we have to have a sysfs device for PLACE to work */
 481         if (!sysfs_device)
 482                 return -ENODEV;
 483
 484         found = 0;
 485         strfieldcpy(path, sysfs_device->path);
 486         temp = strrchr(path, '/');
 487         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 488         if (strstr(temp, dev->place) != NULL) {
 489                 found = 1;
 490         } else {
 491                 *temp = 0x00;
 492                 temp = strrchr(path, '/');
 493                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 494                 if (strstr(temp, dev->place) != NULL)
 495                         found = 1;
 496         }
 497         if (!found) {
 498                 dbg("place doesn't match");
 499                 return -ENODEV;
 500         }
 501
 502         return 0;
 503 }
 504
 505 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 506 {
 507         struct sysfs_device *sysfs_device;
 508         struct sysfs_class_device *class_dev_parent;
 509         struct timespec tspec;
 510         int loop;
 511
 512         /* Figure out where the device symlink is at.  For char devices this will
 513          * always be in the class_dev->path.  But for block devices, it's different.
 514          * The main block device will have the device symlink in it's path, but
 515          * all partitions have the symlink in its parent directory.
 516          * But we need to watch out for block devices that do not have parents, yet
 517          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 518          * symlink yet.  We do sit and spin on waiting for them right now, we should
 519          * possibly have a whitelist for these devices here...
 520          */
 521         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 522         if (class_dev_parent)
 523                 dbg("Really a partition");
 524
 525         tspec.tv_sec = 0;
 526         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 527         loop = 10;
 528         while (loop--) {
 529                 nanosleep(&tspec, NULL);
 530                 if (class_dev_parent)
 531                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 532                 else
 533                         sysfs_device = sysfs_get_classdev_device(class_dev);
 534
 535                 if (sysfs_device != NULL)
 536                         goto device_found;
 537         }
 538         dbg("timed out waiting for device symlink, continuing on anyway...");
 539
 540 device_found:
 541         /* We have another issue with just the wait above - the sysfs part of
 542          * the kernel may not be quick enough to have created the link to the
 543          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 544          * will not contain the actual bus name :(
 545          *
 546          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 547          * if needed
 548          */
 549         if (sysfs_device) {
 550
 551                 if (sysfs_device->bus[0] != '\0')
 552                         goto bus_found;
 553
 554                 loop = 10;
 555                 tspec.tv_nsec = 10000000;
 556                 while (loop--) {
 557                         nanosleep(&tspec, NULL);
 558                         sysfs_get_device_bus(sysfs_device);
 559
 560                         if (sysfs_device->bus[0] != '\0')
 561                                 goto bus_found;
 562                 }
 563                 dbg("timed out waiting to find the device bus, continuing on anyway");
 564                 goto exit;
 565 bus_found:
 566                 dbg("device %s is registered with bus '%s'",
 567                                 sysfs_device->name, sysfs_device->bus);
 568         }
 569 exit:
 570         return sysfs_device;
 571 }
 572
 573 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 574 {
 575         struct sysfs_device *sysfs_device = NULL;
 576         struct config_device *dev;
 577         struct perm_device *perm;
 578         char *pos;
 579
 580         udev->mode = 0;
 581
 582         /* find the sysfs_device associated with this class device */
 583         sysfs_device = get_sysfs_device(class_dev);
 584         if (sysfs_device) {
 585                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 586                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 587                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 588                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 589                 wait_for_device_to_initialize(sysfs_device);
 590         } else {
 591                 dbg("class_dev->name = '%s'", class_dev->name);
 592         }
 593
 594         strfieldcpy(udev->kernel_name, class_dev->name);
 595
 596         /* get kernel number */
 597         pos = class_dev->name + strlen(class_dev->name);
 598         while (isdigit(*(pos-1)))
 599                 pos--;
 600         strfieldcpy(udev->kernel_number, pos);
 601         dbg("kernel_number='%s'", udev->kernel_number);
 602
 603         /* look for a matching rule to apply */
 604         list_for_each_entry(dev, &config_device_list, node) {
 605                 dbg("process rule");
 606
 607                 /* check for matching bus value */
 608                 if (dev->bus[0] != '\0') {
 609                         if (sysfs_device == NULL) {
 610                                 dbg("device has no bus");
 611                                 continue;
 612                         }
 613                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 614                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 615                                 dbg(FIELD_BUS " is not matching");
 616                                 continue;
 617                         } else {
 618                                 dbg(FIELD_BUS " matches");
 619                         }
 620                 }
 621
 622                 /* check for matching kernel name*/
 623                 if (dev->kernel[0] != '\0') {
 624                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 625                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 626                                 dbg(FIELD_KERNEL " is not matching");
 627                                 continue;
 628                         } else {
 629                                 dbg(FIELD_KERNEL " matches");
 630                         }
 631                 }
 632
 633                 /* check for matching bus id */
 634                 if (dev->id[0] != '\0') {
 635                         dbg("check " FIELD_ID);
 636                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 637                                 dbg(FIELD_ID " is not matching");
 638                                 continue;
 639                         } else {
 640                                 dbg(FIELD_ID " matches");
 641                         }
 642                 }
 643
 644                 /* check for matching place of device */
 645                 if (dev->place[0] != '\0') {
 646                         dbg("check " FIELD_PLACE);
 647                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 648                                 dbg(FIELD_PLACE " is not matching");
 649                                 continue;
 650                         } else {
 651                                 dbg(FIELD_PLACE " matches");
 652                         }
 653                 }
 654
 655                 /* check for matching sysfs pairs */
 656                 if (dev->sysfs_pair[0].file[0] != '\0') {
 657                         dbg("check " FIELD_SYSFS " pairs");
 658                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 659                                 dbg(FIELD_SYSFS " is not matching");
 660                                 continue;
 661                         } else {
 662                                 dbg(FIELD_SYSFS " matches");
 663                         }
 664                 }
 665
 666                 /* execute external program */
 667                 if (dev->program[0] != '\0') {
 668                         dbg("check " FIELD_PROGRAM);
 669                         apply_format(udev, dev->program);
 670                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 671                                 dbg(FIELD_PROGRAM " returned nozero");
 672                                 continue;
 673                         } else {
 674                                 dbg(FIELD_PROGRAM " returned successful");
 675                         }
 676                 }
 677
 678                 /* check for matching result of external program */
 679                 if (dev->result[0] != '\0') {
 680                         dbg("check for " FIELD_RESULT
 681                             " dev->result='%s', udev->program_result='%s'",
 682                             dev->result, udev->program_result);
 683                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 684                                 dbg(FIELD_RESULT " is not matching");
 685                                 continue;
 686                         } else {
 687                                 dbg(FIELD_RESULT " matches");
 688                         }
 689                 }
 690
 691                 /* check if we are instructed to ignore this device */
 692                 if (dev->name[0] == '\0') {
 693                         dbg("instructed to ignore this device");
 694                         return -1;
 695                 }
 696
 697                 /* Yup, this rule belongs to us! */
 698                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 699                     udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
 700                 strfieldcpy(udev->name, dev->name);
 701                 strfieldcpy(udev->symlink, dev->symlink);
 702                 goto found;
 703         }
 704
 705         /* no rule was found so we use the kernel name */
 706         strfieldcpy(udev->name, class_dev->name);
 707         goto done;
 708
 709 found:
 710         /* substitute placeholder */
 711         apply_format(udev, udev->name);
 712         apply_format(udev, udev->symlink);
 713
 714 done:
 715         perm = find_perm(udev->name);
 716         if (perm) {
 717                 udev->mode = perm->mode;
 718                 strfieldcpy(udev->owner, perm->owner);
 719                 strfieldcpy(udev->group, perm->group);
 720         } else {
 721                 /* no matching perms found :( */
 722                 udev->mode = get_default_mode(class_dev);
 723                 udev->owner[0] = 0x00;
 724                 udev->group[0] = 0x00;
 725         }
 726         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 727             udev->name, udev->owner, udev->group, udev->mode);
 728
 729         return 0;
 730 }
 731
 732 int namedev_init(void)
 733 {
 734         int retval;
 735
 736         retval = namedev_init_rules();
 737         if (retval)
 738                 return retval;
 739
 740         retval = namedev_init_permissions();
 741         if (retval)
 742                 return retval;
 743
 744         dump_config_dev_list();
 745         dump_perm_dev_list();
 746         return retval;
 747 }