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