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 <sys/wait.h>
  33 #include <sys/stat.h>
  34
  35 #include "list.h"
  36 #include "udev.h"
  37 #include "udev_version.h"
  38 #include "namedev.h"
  39 #include "libsysfs/libsysfs.h"
  40 #include "klibc_fixups.h"
  41
  42 LIST_HEAD(config_device_list);
  43 LIST_HEAD(perm_device_list);
  44
  45 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  46 static int strcmp_pattern(const char *p, const char *s)
  47 {
  48         if (*s == '\0') {
  49                 while (*p == '*')
  50                         p++;
  51                 return (*p != '\0');
  52         }
  53         switch (*p) {
  54         case '[':
  55                 {
  56                         int not = 0;
  57                         p++;
  58                         if (*p == '!') {
  59                                 not = 1;
  60                                 p++;
  61                         }
  62                         while (*p && (*p != ']')) {
  63                                 int match = 0;
  64                                 if (p[1] == '-') {
  65                                         if ((*s >= *p) && (*s <= p[2]))
  66                                                 match = 1;
  67                                         p += 3;
  68                                 } else {
  69                                         match = (*p == *s);
  70                                         p++;
  71                                 }
  72                                 if (match ^ not) {
  73                                         while (*p && (*p != ']'))
  74                                                 p++;
  75                                         return strcmp_pattern(p+1, s+1);
  76                                 }
  77                         }
  78                 }
  79                 break;
  80         case '*':
  81                 if (strcmp_pattern(p, s+1))
  82                         return strcmp_pattern(p+1, s);
  83                 return 0;
  84         case '\0':
  85                 if (*s == '\0') {
  86                         return 0;
  87                 }
  88                 break;
  89         default:
  90                 if ((*p == *s) || (*p == '?'))
  91                         return strcmp_pattern(p+1, s+1);
  92                 break;
  93         }
  94         return 1;
  95 }
  96
  97 #define copy_var(a, b, var)             \
  98         if (b->var)                     \
  99                 a->var = b->var;
 100
 101 #define copy_string(a, b, var)          \
 102         if (strlen(b->var))             \
 103                 strcpy(a->var, b->var);
 104
 105 int add_perm_dev(struct perm_device *new_dev)
 106 {
 107         struct perm_device *dev;
 108         struct perm_device *tmp_dev;
 109
 110         /* update the values if we already have the device */
 111         list_for_each_entry(dev, &perm_device_list, node) {
 112                 if (strcmp_pattern(new_dev->name, dev->name))
 113                         continue;
 114                 copy_var(dev, new_dev, mode);
 115                 copy_string(dev, new_dev, owner);
 116                 copy_string(dev, new_dev, group);
 117                 return 0;
 118         }
 119
 120         /* not found, add new structure to the perm list */
 121         tmp_dev = malloc(sizeof(*tmp_dev));
 122         if (!tmp_dev)
 123                 return -ENOMEM;
 124         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 125         list_add_tail(&tmp_dev->node, &perm_device_list);
 126         //dump_perm_dev(tmp_dev);
 127         return 0;
 128 }
 129
 130 static struct perm_device *find_perm(char *name)
 131 {
 132         struct perm_device *perm;
 133
 134         list_for_each_entry(perm, &perm_device_list, node) {
 135                 if (strcmp_pattern(perm->name, name))
 136                         continue;
 137                 return perm;
 138         }
 139         return NULL;
 140 }
 141
 142 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 143 {
 144         mode_t mode = 0600;     /* default to owner rw only */
 145
 146         if (strlen(default_mode_str) != 0) {
 147                 mode = strtol(default_mode_str, NULL, 8);
 148         }
 149         return mode;
 150 }
 151
 152 static void apply_format(struct udevice *udev, unsigned char *string)
 153 {
 154         char temp[NAME_SIZE];
 155         char temp1[NAME_SIZE];
 156         char *tail;
 157         char *pos;
 158         char *pos2;
 159         char *pos3;
 160         int num;
 161
 162         pos = string;
 163         while (1) {
 164                 num = 0;
 165                 pos = strchr(pos, '%');
 166
 167                 if (pos) {
 168                         pos[0] = '\0';
 169                         tail = pos+1;
 170                         if (isdigit(tail[0])) {
 171                                 num = (int) strtoul(&pos[1], &tail, 10);
 172                                 if (tail == NULL) {
 173                                         dbg("format parsing error '%s'", pos+1);
 174                                         break;
 175                                 }
 176                         }
 177                         strfieldcpy(temp, tail+1);
 178
 179                         switch (tail[0]) {
 180                         case 'b':
 181                                 if (strlen(udev->bus_id) == 0)
 182                                         break;
 183                                 strcat(pos, udev->bus_id);
 184                                 dbg("substitute bus_id '%s'", udev->bus_id);
 185                                 break;
 186                         case 'k':
 187                                 if (strlen(udev->kernel_name) == 0)
 188                                         break;
 189                                 strcat(pos, udev->kernel_name);
 190                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 191                                 break;
 192                         case 'n':
 193                                 if (strlen(udev->kernel_number) == 0)
 194                                         break;
 195                                 strcat(pos, udev->kernel_number);
 196                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 197                                 break;
 198                         case 'D':
 199                                 if (strlen(udev->kernel_number) == 0) {
 200                                         strcat(pos, "disc");
 201                                         dbg("substitute devfs disc");
 202                                         break;
 203                                 }
 204                                 strcat(pos, "part");
 205                                 strcat(pos, udev->kernel_number);
 206                                 dbg("substitute devfs part '%s'", udev->kernel_number);
 207                                 break;
 208                         case 'm':
 209                                 sprintf(pos, "%u", udev->minor);
 210                                 dbg("substitute minor number '%u'", udev->minor);
 211                                 break;
 212                         case 'M':
 213                                 sprintf(pos, "%u", udev->major);
 214                                 dbg("substitute major number '%u'", udev->major);
 215                                 break;
 216                         case 'c':
 217                                 if (strlen(udev->program_result) == 0)
 218                                         break;
 219                                 if (num) {
 220                                         /* get part of return string */
 221                                         strncpy(temp1, udev->program_result, sizeof(temp1));
 222                                         pos2 = temp1;
 223                                         while (num) {
 224                                                 num--;
 225                                                 pos3 = strsep(&pos2, " ");
 226                                                 if (pos3 == NULL) {
 227                                                         dbg("requested part of result string not found");
 228                                                         break;
 229                                                 }
 230                                         }
 231                                         if (pos3) {
 232                                                 strcat(pos, pos3);
 233                                                 dbg("substitute part of result string '%s'", pos3);
 234                                         }
 235                                 } else {
 236                                         strcat(pos, udev->program_result);
 237                                         dbg("substitute result string '%s'", udev->program_result);
 238                                 }
 239                                 break;
 240                         case '%':
 241                                 strcat(pos, "%");
 242                                 pos++;
 243                                 break;
 244                         default:
 245                                 dbg("unknown substitution type '%%%c'", pos[1]);
 246                                 break;
 247                         }
 248                         strcat(string, temp);
 249                 } else
 250                         break;
 251         }
 252 }
 253
 254 static struct bus_file {
 255         char *bus;
 256         char *file;
 257 } bus_files[] = {
 258         { .bus = "scsi",        .file = "vendor" },
 259         { .bus = "usb",         .file = "idVendor" },
 260         { .bus = "usb-serial",  .file = "detach_state" },
 261         { .bus = "ide",         .file = "detach_state" },
 262         { .bus = "pci",         .file = "vendor" },
 263         {}
 264 };
 265
 266 #define SECONDS_TO_WAIT_FOR_FILE        10
 267 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 268 {
 269         /* sleep until we see the file for this specific bus type show up this
 270          * is needed because we can easily out-run the kernel in looking for
 271          * these files before the paticular subsystem has created them in the
 272          * sysfs tree properly.
 273          *
 274          * And people thought that the /sbin/hotplug event system was going to
 275          * be slow, poo on you for arguing that before even testing it...
 276          */
 277         struct bus_file *b = &bus_files[0];
 278         struct sysfs_attribute *tmpattr;
 279         int loop;
 280
 281         while (1) {
 282                 if (b->bus == NULL)
 283                         break;
 284                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 285                         tmpattr = NULL;
 286                         loop = SECONDS_TO_WAIT_FOR_FILE;
 287                         while (loop--) {
 288                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 289                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 290                                 if (tmpattr) {
 291                                         /* found it! */
 292                                         goto exit;
 293                                 }
 294                                 /* sleep to give the kernel a chance to create the file */
 295                                 sleep(1);
 296                         }
 297                         dbg("Timed out waiting for '%s' file, continuing on anyway...", b->file);
 298                         goto exit;
 299                 }
 300                 b++;
 301         }
 302         dbg("Did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 303 exit:
 304         return; /* here to prevent compiler warning... */
 305 }
 306
 307 static int execute_program(char *path, char *value, int len)
 308 {
 309         int retval;
 310         int res;
 311         int status;
 312         int fds[2];
 313         pid_t pid;
 314         int value_set = 0;
 315         char buffer[256];
 316         char *pos;
 317         char *args[PROGRAM_MAXARG];
 318         int i;
 319
 320         dbg("executing '%s'", path);
 321         retval = pipe(fds);
 322         if (retval != 0) {
 323                 dbg("pipe failed");
 324                 return -1;
 325         }
 326         pid = fork();
 327         if (pid == -1) {
 328                 dbg("fork failed");
 329                 return -1;
 330         }
 331
 332         if (pid == 0) {
 333                 /* child */
 334                 close(STDOUT_FILENO);
 335                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 336                 if (strchr(path, ' ')) {
 337                         /* exec with arguments */
 338                         pos = path;
 339                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 340                                 args[i] = strsep(&pos, " ");
 341                                 if (args[i] == NULL)
 342                                         break;
 343                         }
 344                         if (args[i]) {
 345                                 dbg("too many args - %d", i);
 346                                 args[i] = NULL;
 347                         }
 348                         retval = execve(args[0], args, main_envp);
 349                 } else {
 350                         retval = execve(path, main_argv, main_envp);
 351                 }
 352                 if (retval != 0) {
 353                         dbg("child execve failed");
 354                         exit(1);
 355                 }
 356                 return -1; /* avoid compiler warning */
 357         } else {
 358                 /* parent reads from fds[0] */
 359                 close(fds[1]);
 360                 retval = 0;
 361                 while (1) {
 362                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 363                         if (res <= 0)
 364                                 break;
 365                         buffer[res] = '\0';
 366                         if (res > len) {
 367                                 dbg("result len %d too short", len);
 368                                 retval = -1;
 369                         }
 370                         if (value_set) {
 371                                 dbg("result value already set");
 372                                 retval = -1;
 373                         } else {
 374                                 value_set = 1;
 375                                 strncpy(value, buffer, len);
 376                                 pos = value + strlen(value)-1;
 377                                 if (pos[0] == '\n')
 378                                 pos[0] = '\0';
 379                                 dbg("result is '%s'", value);
 380                         }
 381                 }
 382                 close(fds[0]);
 383                 res = wait(&status);
 384                 if (res < 0) {
 385                         dbg("wait failed result %d", res);
 386                         retval = -1;
 387                 }
 388
 389                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 390                         dbg("exec program status 0x%x", status);
 391                         retval = -1;
 392                 }
 393         }
 394         return retval;
 395 }
 396
 397 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 398 {
 399         struct sysfs_attribute *tmpattr = NULL;
 400         char *c;
 401
 402         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 403                 return -ENODEV;
 404
 405         dbg("look for device attribute '%s'", pair->file);
 406         /* try to find the attribute in the class device directory */
 407         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 408         if (tmpattr)
 409                 goto label_found;
 410
 411         /* look in the class device directory if present */
 412         if (sysfs_device) {
 413                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 414                 if (tmpattr)
 415                         goto label_found;
 416         }
 417         return -ENODEV;
 418
 419 label_found:
 420         c = tmpattr->value + strlen(tmpattr->value)-1;
 421         if (*c == '\n')
 422                 *c = 0x00;
 423         dbg("compare attribute '%s' value '%s' with '%s'",
 424                   pair->file, tmpattr->value, pair->value);
 425         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 426                 return -ENODEV;
 427
 428         dbg("found matching attribute '%s' with value '%s'",
 429             pair->file, pair->value);
 430         return 0;
 431 }
 432
 433 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 434 {
 435         struct sysfs_pair *pair;
 436         int i;
 437
 438         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 439                 pair = &dev->sysfs_pair[i];
 440                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 441                         break;
 442                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 443                         dbg("sysfs attribute doesn't match");
 444                         return -ENODEV;
 445                 }
 446         }
 447
 448         return 0;
 449 }
 450
 451 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 452 {
 453         char path[SYSFS_PATH_MAX];
 454         int found;
 455         char *temp = NULL;
 456
 457         /* we have to have a sysfs device for ID to work */
 458         if (!sysfs_device)
 459                 return -ENODEV;
 460
 461         found = 0;
 462         strfieldcpy(path, sysfs_device->path);
 463         temp = strrchr(path, '/');
 464         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 465         if (strstr(temp, dev->id) != NULL) {
 466                 found = 1;
 467         } else {
 468                 *temp = 0x00;
 469                 temp = strrchr(path, '/');
 470                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 471                 if (strstr(temp, dev->id) != NULL)
 472                         found = 1;
 473         }
 474         if (!found) {
 475                 dbg("id doesn't match");
 476                 return -ENODEV;
 477         }
 478
 479         return 0;
 480 }
 481
 482 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 483 {
 484         char path[SYSFS_PATH_MAX];
 485         int found;
 486         char *temp = NULL;
 487
 488         /* we have to have a sysfs device for PLACE to work */
 489         if (!sysfs_device)
 490                 return -ENODEV;
 491
 492         found = 0;
 493         strfieldcpy(path, sysfs_device->path);
 494         temp = strrchr(path, '/');
 495         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 496         if (strstr(temp, dev->place) != NULL) {
 497                 found = 1;
 498         } else {
 499                 *temp = 0x00;
 500                 temp = strrchr(path, '/');
 501                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 502                 if (strstr(temp, dev->place) != NULL)
 503                         found = 1;
 504         }
 505         if (!found) {
 506                 dbg("place doesn't match");
 507                 return -ENODEV;
 508         }
 509
 510         return 0;
 511 }
 512
 513 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 514 {
 515         struct sysfs_device *sysfs_device;
 516         struct sysfs_class_device *class_dev_parent;
 517         int loop;
 518         char filename[SYSFS_PATH_MAX + 6];
 519         int retval;
 520         char *temp;
 521         int partition = 0;
 522
 523         /* Figure out where the device symlink is at.  For char devices this will
 524          * always be in the class_dev->path.  But for block devices, it's different.
 525          * The main block device will have the device symlink in it's path, but
 526          * all partitions have the symlink in its parent directory.
 527          * But we need to watch out for block devices that do not have parents, yet
 528          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 529          * symlink yet.  We do sit and spin on waiting for them right now, we should
 530          * possibly have a whitelist for these devices here...
 531          */
 532         strcpy(filename, class_dev->path);
 533         dbg("filename = %s", filename);
 534         if (strcmp(class_dev->classname, SYSFS_BLOCK_NAME) == 0) {
 535                 if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 536                         temp = strrchr(filename, '/');
 537                         if (temp) {
 538                                 char *temp2 = strrchr(filename, '/');
 539                                 partition = 1;
 540                                 *temp = 0x00;
 541                                 dbg("temp2 = %s", temp2);
 542                                 if (temp2 && (strcmp(temp2, "/block") == 0)) {
 543                                         /* oops, we have no parent block device, so go back to original directory */
 544                                         strcpy(filename, class_dev->path);
 545                                         partition = 0;
 546                                 }
 547                         }
 548                 }
 549         }
 550         strcat(filename, "/device");
 551
 552         loop = 2;
 553         while (loop--) {
 554                 struct stat buf;
 555                 dbg("looking for '%s'", filename);
 556                 retval = stat(filename, &buf);
 557                 if (!retval)
 558                         break;
 559                 /* sleep to give the kernel a chance to create the device file */
 560                 sleep(1);
 561         }
 562
 563         loop = 1;       /* FIXME put a real value in here for when everything is fixed... */
 564         while (loop--) {
 565                 /* find the sysfs_device for this class device */
 566                 /* Wouldn't it really be nice if libsysfs could do this for us? */
 567                 sysfs_device = sysfs_get_classdev_device(class_dev);
 568                 if (sysfs_device != NULL)
 569                         goto exit;
 570
 571                 /* if it's a partition, we need to get the parent device */
 572                 if (partition) {
 573                         /* FIXME  HACK HACK HACK HACK
 574                          * for some reason partitions need this extra sleep here, in order
 575                          * to wait for the device properly.  Once the libsysfs code is
 576                          * fixed properly, this sleep should go away, and we can just loop above.
 577                          */
 578                         sleep(1);
 579                         dbg("really is a partition");
 580                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 581                         if (class_dev_parent == NULL) {
 582                                 dbg("sysfs_get_classdev_parent for class device '%s' failed", class_dev->name);
 583                         } else {
 584                                 dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 585                                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 586                                 if (sysfs_device != NULL)
 587                                         goto exit;
 588                         }
 589                 }
 590                 /* sleep to give the kernel a chance to create the link */
 591                 /* FIXME remove comment...
 592                 sleep(1); */
 593         }
 594         dbg("Timed out waiting for device symlink, continuing on anyway...");
 595 exit:
 596         return sysfs_device;
 597 }
 598
 599 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 600 {
 601         struct sysfs_device *sysfs_device = NULL;
 602         struct config_device *dev;
 603         struct perm_device *perm;
 604         char *pos;
 605
 606         udev->mode = 0;
 607
 608         /* find the sysfs_device associated with this class device */
 609         sysfs_device = get_sysfs_device(class_dev);
 610         if (sysfs_device) {
 611                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 612                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 613                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 614                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 615                 wait_for_device_to_initialize(sysfs_device);
 616         } else {
 617                 dbg("class_dev->name = '%s'", class_dev->name);
 618         }
 619
 620         strfieldcpy(udev->kernel_name, class_dev->name);
 621
 622         /* get kernel number */
 623         pos = class_dev->name + strlen(class_dev->name);
 624         while (isdigit(*(pos-1)))
 625                 pos--;
 626         strfieldcpy(udev->kernel_number, pos);
 627         dbg("kernel_number='%s'", udev->kernel_number);
 628
 629         /* look for a matching rule to apply */
 630         list_for_each_entry(dev, &config_device_list, node) {
 631                 dbg("process rule");
 632
 633                 /* check for matching bus value */
 634                 if (dev->bus[0] != '\0') {
 635                         if (sysfs_device == NULL) {
 636                                 dbg("device has no bus");
 637                                 continue;
 638                         }
 639                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 640                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 641                                 dbg(FIELD_BUS " is not matching");
 642                                 continue;
 643                         } else {
 644                                 dbg(FIELD_BUS " matches");
 645                         }
 646                 }
 647
 648                 /* check for matching kernel name*/
 649                 if (dev->kernel[0] != '\0') {
 650                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 651                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 652                                 dbg(FIELD_KERNEL " is not matching");
 653                                 continue;
 654                         } else {
 655                                 dbg(FIELD_KERNEL " matches");
 656                         }
 657                 }
 658
 659                 /* check for matching bus id */
 660                 if (dev->id[0] != '\0') {
 661                         dbg("check " FIELD_ID);
 662                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 663                                 dbg(FIELD_ID " is not matching");
 664                                 continue;
 665                         } else {
 666                                 dbg(FIELD_ID " matches");
 667                         }
 668                 }
 669
 670                 /* check for matching place of device */
 671                 if (dev->place[0] != '\0') {
 672                         dbg("check " FIELD_PLACE);
 673                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 674                                 dbg(FIELD_PLACE " is not matching");
 675                                 continue;
 676                         } else {
 677                                 dbg(FIELD_PLACE " matches");
 678                         }
 679                 }
 680
 681                 /* check for matching sysfs pairs */
 682                 if (dev->sysfs_pair[0].file[0] != '\0') {
 683                         dbg("check " FIELD_SYSFS " pairs");
 684                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 685                                 dbg(FIELD_SYSFS " is not matching");
 686                                 continue;
 687                         } else {
 688                                 dbg(FIELD_SYSFS " matches");
 689                         }
 690                 }
 691
 692                 /* execute external program */
 693                 if (dev->program[0] != '\0') {
 694                         dbg("check " FIELD_PROGRAM);
 695                         apply_format(udev, dev->program);
 696                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 697                                 dbg(FIELD_PROGRAM " returned nozero");
 698                                 continue;
 699                         } else {
 700                                 dbg(FIELD_PROGRAM " returned successful");
 701                         }
 702                 }
 703
 704                 /* check for matching result of external program */
 705                 if (dev->result[0] != '\0') {
 706                         dbg("check for " FIELD_RESULT
 707                             " dev->result='%s', udev->program_result='%s'",
 708                             dev->result, udev->program_result);
 709                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 710                                 dbg(FIELD_RESULT " is not matching");
 711                                 continue;
 712                         } else {
 713                                 dbg(FIELD_RESULT " matches");
 714                         }
 715                 }
 716
 717                 /* check if we are instructed to ignore this device */
 718                 if (dev->name[0] == '\0') {
 719                         dbg("instructed to ignore this device");
 720                         return -1;
 721                 }
 722
 723                 /* Yup, this rule belongs to us! */
 724                 dbg("found matching rule, '%s' becomes '%s'", dev->kernel, dev->name);
 725                 strfieldcpy(udev->name, dev->name);
 726                 strfieldcpy(udev->symlink, dev->symlink);
 727                 goto found;
 728         }
 729
 730         /* no rule was found so we use the kernel name */
 731         strfieldcpy(udev->name, class_dev->name);
 732         goto done;
 733
 734 found:
 735         /* substitute placeholder */
 736         apply_format(udev, udev->name);
 737         apply_format(udev, udev->symlink);
 738
 739 done:
 740         perm = find_perm(udev->name);
 741         if (perm) {
 742                 udev->mode = perm->mode;
 743                 strfieldcpy(udev->owner, perm->owner);
 744                 strfieldcpy(udev->group, perm->group);
 745         } else {
 746                 /* no matching perms found :( */
 747                 udev->mode = get_default_mode(class_dev);
 748                 udev->owner[0] = 0x00;
 749                 udev->group[0] = 0x00;
 750         }
 751         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 752             udev->name, udev->owner, udev->group, udev->mode);
 753
 754         return 0;
 755 }
 756
 757 int namedev_init(void)
 758 {
 759         int retval;
 760
 761         retval = namedev_init_rules();
 762         if (retval)
 763                 return retval;
 764
 765         retval = namedev_init_permissions();
 766         if (retval)
 767                 return retval;
 768
 769         dump_config_dev_list();
 770         dump_perm_dev_list();
 771         return retval;
 772 }