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 #include <sys/sysinfo.h>
  35
  36 #include "libsysfs/sysfs/libsysfs.h"
  37 #include "list.h"
  38 #include "udev.h"
  39 #include "udev_lib.h"
  40 #include "udev_version.h"
  41 #include "logging.h"
  42 #include "namedev.h"
  43 #include "klibc_fixups.h"
  44 #include "udevdb.h"
  45
  46 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  47
  48 LIST_HEAD(config_device_list);
  49 LIST_HEAD(perm_device_list);
  50
  51
  52 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  53 static int strcmp_pattern(const char *p, const char *s)
  54 {
  55         if (s[0] == '\0') {
  56                 while (p[0] == '*')
  57                         p++;
  58                 return (p[0] != '\0');
  59         }
  60         switch (p[0]) {
  61         case '[':
  62                 {
  63                         int not = 0;
  64                         p++;
  65                         if (p[0] == '!') {
  66                                 not = 1;
  67                                 p++;
  68                         }
  69                         while ((p[0] != '\0') && (p[0] != ']')) {
  70                                 int match = 0;
  71                                 if (p[1] == '-') {
  72                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  73                                                 match = 1;
  74                                         p += 3;
  75                                 } else {
  76                                         match = (p[0] == s[0]);
  77                                         p++;
  78                                 }
  79                                 if (match ^ not) {
  80                                         while ((p[0] != '\0') && (p[0] != ']'))
  81                                                 p++;
  82                                         if (p[0] == ']')
  83                                                 return strcmp_pattern(p+1, s+1);
  84                                 }
  85                         }
  86                 }
  87                 break;
  88         case '*':
  89                 if (strcmp_pattern(p, s+1))
  90                         return strcmp_pattern(p+1, s);
  91                 return 0;
  92         case '\0':
  93                 if (s[0] == '\0') {
  94                         return 0;
  95                 }
  96                 break;
  97         default:
  98                 if ((p[0] == s[0]) || (p[0] == '?'))
  99                         return strcmp_pattern(p+1, s+1);
 100                 break;
 101         }
 102         return 1;
 103 }
 104
 105 static struct perm_device *find_perm(char *name)
 106 {
 107         struct perm_device *perm;
 108
 109         list_for_each_entry(perm, &perm_device_list, node) {
 110                 if (strcmp_pattern(perm->name, name))
 111                         continue;
 112                 return perm;
 113         }
 114         return NULL;
 115 }
 116
 117 static mode_t get_default_mode(void)
 118 {
 119         mode_t mode = 0600;     /* default to owner rw only */
 120
 121         if (strlen(default_mode_str) != 0)
 122                 mode = strtol(default_mode_str, NULL, 8);
 123
 124         return mode;
 125 }
 126
 127 static char *get_default_owner(void)
 128 {
 129         if (strlen(default_owner_str) == 0)
 130                 strfieldcpy(default_owner_str, "root");
 131
 132         return default_owner_str;
 133 }
 134
 135 static char *get_default_group(void)
 136 {
 137         if (strlen(default_group_str) == 0)
 138                 strfieldcpy(default_group_str, "root");
 139
 140         return default_group_str;
 141 }
 142
 143 /* extract possible {attr} and move str behind it */
 144 static char *get_format_attribute(char **str)
 145 {
 146         char *pos;
 147         char *attr = NULL;
 148
 149         if (*str[0] == '{') {
 150                 pos = strchr(*str, '}');
 151                 if (pos == NULL) {
 152                         dbg("missing closing brace for format");
 153                         return NULL;
 154                 }
 155                 pos[0] = '\0';
 156                 attr = *str+1;
 157                 *str = pos+1;
 158                 dbg("attribute='%s', str='%s'", attr, *str);
 159         }
 160         return attr;
 161 }
 162
 163 /* extract possible format length and move str behind it*/
 164 static int get_format_len(char **str)
 165 {
 166         int num;
 167         char *tail;
 168
 169         if (isdigit(*str[0])) {
 170                 num = (int) strtoul(*str, &tail, 10);
 171                 if (num > 0) {
 172                         *str = tail;
 173                         dbg("format length=%i", num);
 174                         return num;
 175                 } else {
 176                         dbg("format parsing error '%s'", *str);
 177                 }
 178         }
 179         return -1;
 180 }
 181
 182 /** Finds the lowest positive N such that <name>N isn't present in
 183  *  $(udevroot) either as a file or a symlink.
 184  *
 185  *  @param  name                Name to check for
 186  *  @return                     0 if <name> didn't exist and N otherwise.
 187  */
 188 static unsigned int find_free_number (struct udevice *udev, char *name)
 189 {
 190         char temp[NAME_SIZE];
 191         char path[NAME_SIZE];
 192         struct udevice dev;
 193         int result;
 194
 195         /* have to sweep the database for each lookup */
 196         result = 0;
 197         strncpy(temp, name, sizeof (temp));
 198         while (1) {
 199                 if (udevdb_get_dev_byname(temp, path, &dev) != 0)
 200                         goto found;
 201                 /* symlink might be stale if $(udevroot) isn't cleaned; check
 202                  * on major/minor to see if it's the same device
 203                  */
 204                 if (dev.major == udev->major && dev.minor == udev->minor)
 205                         goto found;
 206                 snprintf (temp, sizeof(temp), "%s%d", name, ++result);
 207         }
 208
 209 found:
 210         return result;
 211 }
 212
 213 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 214                          struct sysfs_class_device *class_dev,
 215                          struct sysfs_device *sysfs_device)
 216 {
 217         char temp[NAME_SIZE];
 218         char temp2[NAME_SIZE];
 219         char *tail;
 220         char *pos;
 221         char *attr;
 222         int len;
 223         int i;
 224         char c;
 225         char *spos;
 226         char *rest;
 227         int slen;
 228         struct sysfs_attribute *tmpattr;
 229         unsigned int next_free_number;
 230
 231         pos = string;
 232         while (1) {
 233                 pos = strchr(pos, '%');
 234                 if (pos == NULL)
 235                         break;
 236
 237                 pos[0] = '\0';
 238                 tail = pos+1;
 239                 len = get_format_len(&tail);
 240                 c = tail[0];
 241                 strfieldcpy(temp, tail+1);
 242                 tail = temp;
 243                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 244                 attr = get_format_attribute(&tail);
 245
 246
 247                 switch (c) {
 248                 case 'b':
 249                         if (strlen(udev->bus_id) == 0)
 250                                 break;
 251                         strfieldcatmax(string, udev->bus_id, maxsize);
 252                         dbg("substitute bus_id '%s'", udev->bus_id);
 253                         break;
 254                 case 'k':
 255                         if (strlen(udev->kernel_name) == 0)
 256                                 break;
 257                         strfieldcatmax(string, udev->kernel_name, maxsize);
 258                         dbg("substitute kernel name '%s'", udev->kernel_name);
 259                         break;
 260                 case 'n':
 261                         if (strlen(udev->kernel_number) == 0)
 262                                 break;
 263                         strfieldcatmax(string, udev->kernel_number, maxsize);
 264                         dbg("substitute kernel number '%s'", udev->kernel_number);
 265                                 break;
 266                 case 'm':
 267                         strintcatmax(string, udev->minor, maxsize);
 268                         dbg("substitute minor number '%u'", udev->minor);
 269                         break;
 270                 case 'M':
 271                         strintcatmax(string, udev->major, maxsize);
 272                         dbg("substitute major number '%u'", udev->major);
 273                         break;
 274                 case 'c':
 275                         if (strlen(udev->program_result) == 0)
 276                                 break;
 277                         /* get part part of the result string */
 278                         i = 0;
 279                         if (attr != NULL)
 280                                 i = strtoul(attr, &rest, 10);
 281                         if (i > 0) {
 282                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 283                                         i--;
 284                                         if (i == 0)
 285                                                 break;
 286                                 }
 287                                 if (i > 0) {
 288                                         dbg("requested part of result string not found");
 289                                         break;
 290                                 }
 291                                 if (rest[0] == '+')
 292                                         strfieldcpy(temp2, spos);
 293                                 else
 294                                         strfieldcpymax(temp2, spos, slen+1);
 295                                 strfieldcatmax(string, temp2, maxsize);
 296                                 dbg("substitute part of result string '%s'", temp2);
 297                         } else {
 298                                 strfieldcatmax(string, udev->program_result, maxsize);
 299                                 dbg("substitute result string '%s'", udev->program_result);
 300                         }
 301                         break;
 302                 case 's':
 303                         if (attr != NULL) {
 304                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 305                                 if (tmpattr == NULL) {
 306                                         dbg("sysfa attribute '%s' not found", attr);
 307                                         break;
 308                                 }
 309                                 /* strip trailing whitespace of matching value */
 310                                 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 311                                         i = len = strlen(tmpattr->value);
 312                                         while (i > 0 &&  isspace(tmpattr->value[i-1]))
 313                                                 i--;
 314                                         if (i < len) {
 315                                                 tmpattr->value[i] = '\0';
 316                                                 dbg("remove %i trailing whitespace chars from '%s'",
 317                                                          len - i, tmpattr->value);
 318                                         }
 319                                 }
 320                                 strfieldcatmax(string, tmpattr->value, maxsize);
 321                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 322                         } else {
 323                                 dbg("missing attribute");
 324                         }
 325                         break;
 326                 case '%':
 327                         strfieldcatmax(string, "%", maxsize);
 328                         pos++;
 329                         break;
 330                 case 'e':
 331                         next_free_number = find_free_number(udev, string);
 332                         if (next_free_number > 0) {
 333                                 snprintf(temp2, sizeof(temp2), "%d", next_free_number);
 334                                 strfieldcatmax(string, temp2, maxsize);
 335                         }
 336                         break;
 337                 default:
 338                         dbg("unknown substitution type '%%%c'", c);
 339                         break;
 340                 }
 341                 /* truncate to specified length */
 342                 if (len > 0)
 343                         pos[len] = '\0';
 344
 345                 strfieldcatmax(string, tail, maxsize);
 346         }
 347 }
 348
 349 static void fix_kernel_name(struct udevice *udev)
 350 {
 351         char *temp = udev->kernel_name;
 352
 353         while (*temp != 0x00) {
 354                 /* Some block devices have a ! in their name,
 355                  * we need to change that to / */
 356                 if (*temp == '!')
 357                         *temp = '/';
 358                 ++temp;
 359         }
 360 }
 361
 362 static int execute_program(const char *path, char *value, int len)
 363 {
 364         int retval;
 365         int count;
 366         int status;
 367         int fds[2];
 368         pid_t pid;
 369         char *pos;
 370         char arg[PROGRAM_SIZE];
 371         char *argv[(PROGRAM_SIZE / 2) + 1];
 372         int i;
 373
 374         strfieldcpy(arg, path);
 375         i = 0;
 376         if (strchr(path, ' ')) {
 377                 pos = arg;
 378                 while (pos != NULL) {
 379                         if (pos[0] == '\'') {
 380                                 /* don't separate if in apostrophes */
 381                                 pos++;
 382                                 argv[i] = strsep(&pos, "\'");
 383                                 while (pos && pos[0] == ' ')
 384                                         pos++;
 385                         } else {
 386                                 argv[i] = strsep(&pos, " ");
 387                         }
 388                         dbg("arg[%i] '%s'", i, argv[i]);
 389                         i++;
 390                 }
 391                 argv[i] =  NULL;
 392                 dbg("execute '%s' with parsed arguments", arg);
 393         } else {
 394                 argv[0] = arg;
 395                 argv[1] = main_argv[1];
 396                 argv[2] = NULL;
 397                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 398         }
 399
 400         retval = pipe(fds);
 401         if (retval != 0) {
 402                 dbg("pipe failed");
 403                 return -1;
 404         }
 405
 406         pid = fork();
 407         switch(pid) {
 408         case 0:
 409                 /* child */
 410                 /* dup2 write side of pipe to STDOUT */
 411                 dup2(fds[1], STDOUT_FILENO);
 412                 retval = execv(arg, argv);
 413
 414                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 415                 exit(1);
 416         case -1:
 417                 dbg("fork failed");
 418                 return -1;
 419         default:
 420                 /* parent reads from fds[0] */
 421                 close(fds[1]);
 422                 retval = 0;
 423                 i = 0;
 424                 while (1) {
 425                         count = read(fds[0], value + i, len - i-1);
 426                         if (count <= 0)
 427                                 break;
 428
 429                         i += count;
 430                         if (i >= len-1) {
 431                                 dbg("result len %d too short", len);
 432                                 retval = -1;
 433                                 break;
 434                         }
 435                 }
 436
 437                 if (count < 0) {
 438                         dbg("read failed with '%s'", strerror(errno));
 439                         retval = -1;
 440                 }
 441
 442                 if (i > 0 && value[i-1] == '\n')
 443                         i--;
 444                 value[i] = '\0';
 445                 dbg("result is '%s'", value);
 446
 447                 close(fds[0]);
 448                 wait(&status);
 449
 450                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 451                         dbg("exec program status 0x%x", status);
 452                         retval = -1;
 453                 }
 454         }
 455         return retval;
 456 }
 457
 458 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 459 {
 460         struct sysfs_attribute *tmpattr = NULL;
 461         char *c;
 462
 463         dbg("look for device attribute '%s'", attr);
 464         /* try to find the attribute in the class device directory */
 465         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 466         if (tmpattr)
 467                 goto attr_found;
 468
 469         /* look in the class device directory if present */
 470         if (sysfs_device) {
 471                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 472                 if (tmpattr)
 473                         goto attr_found;
 474         }
 475
 476         return NULL;
 477
 478 attr_found:
 479         c = strchr(tmpattr->value, '\n');
 480         if (c != NULL)
 481                 c[0] = '\0';
 482
 483         dbg("found attribute '%s'", tmpattr->path);
 484         return tmpattr;
 485 }
 486
 487 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 488 {
 489         struct sysfs_attribute *tmpattr;
 490         int i;
 491         int len;
 492
 493         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 494                 return -ENODEV;
 495
 496         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 497         if (tmpattr == NULL)
 498                 return -ENODEV;
 499
 500         /* strip trailing whitespace of value, if not asked to match for it */
 501         if (! isspace(pair->value[strlen(pair->value)-1])) {
 502                 i = len = strlen(tmpattr->value);
 503                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 504                         i--;
 505                 if (i < len) {
 506                         tmpattr->value[i] = '\0';
 507                         dbg("remove %i trailing whitespace chars from '%s'",
 508                             len - i, tmpattr->value);
 509                 }
 510         }
 511
 512         dbg("compare attribute '%s' value '%s' with '%s'",
 513                   pair->file, tmpattr->value, pair->value);
 514         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 515                 return -ENODEV;
 516
 517         dbg("found matching attribute '%s' with value '%s'",
 518             pair->file, pair->value);
 519         return 0;
 520 }
 521
 522 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 523 {
 524         struct sysfs_pair *pair;
 525         int i;
 526
 527         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 528                 pair = &dev->sysfs_pair[i];
 529                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 530                         break;
 531                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 532                         dbg("sysfs attribute doesn't match");
 533                         return -ENODEV;
 534                 }
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 541 {
 542         char path[SYSFS_PATH_MAX];
 543         char *temp = NULL;
 544
 545         /* we have to have a sysfs device for ID to work */
 546         if (!sysfs_device)
 547                 return -ENODEV;
 548
 549         strfieldcpy(path, sysfs_device->path);
 550         temp = strrchr(path, '/');
 551         temp++;
 552         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 553         if (strcmp_pattern(dev->id, temp) != 0)
 554                 return -ENODEV;
 555         else
 556                 return 0;
 557 }
 558
 559 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 560 {
 561         char path[SYSFS_PATH_MAX];
 562         int found;
 563         char *temp = NULL;
 564
 565         /* we have to have a sysfs device for PLACE to work */
 566         if (!sysfs_device)
 567                 return -ENODEV;
 568
 569         found = 0;
 570         strfieldcpy(path, sysfs_device->path);
 571         temp = strrchr(path, '/');
 572         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 573         if (strstr(temp, dev->place) != NULL) {
 574                 found = 1;
 575         } else {
 576                 *temp = 0x00;
 577                 temp = strrchr(path, '/');
 578                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 579                 if (strstr(temp, dev->place) != NULL)
 580                         found = 1;
 581         }
 582         if (!found) {
 583                 dbg("place doesn't match");
 584                 return -ENODEV;
 585         }
 586
 587         return 0;
 588 }
 589
 590 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 591 {
 592         while (1) {
 593                 /* check for matching bus value */
 594                 if (dev->bus[0] != '\0') {
 595                         if (sysfs_device == NULL) {
 596                                 dbg("device has no bus");
 597                                 goto try_parent;
 598                         }
 599                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 600                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 601                                 dbg(FIELD_BUS " is not matching");
 602                                 goto try_parent;
 603                         } else {
 604                                 dbg(FIELD_BUS " matches");
 605                         }
 606                 }
 607
 608                 /* check for matching kernel name*/
 609                 if (dev->kernel[0] != '\0') {
 610                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 611                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 612                                 dbg(FIELD_KERNEL " is not matching");
 613                                 goto try_parent;
 614                         } else {
 615                                 dbg(FIELD_KERNEL " matches");
 616                         }
 617                 }
 618
 619                 /* check for matching bus id */
 620                 if (dev->id[0] != '\0') {
 621                         dbg("check " FIELD_ID);
 622                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 623                                 dbg(FIELD_ID " is not matching");
 624                                 goto try_parent;
 625                         } else {
 626                                 dbg(FIELD_ID " matches");
 627                         }
 628                 }
 629
 630                 /* check for matching place of device */
 631                 if (dev->place[0] != '\0') {
 632                         dbg("check " FIELD_PLACE);
 633                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 634                                 dbg(FIELD_PLACE " is not matching");
 635                                 goto try_parent;
 636                         } else {
 637                                 dbg(FIELD_PLACE " matches");
 638                         }
 639                 }
 640
 641                 /* check for matching sysfs pairs */
 642                 if (dev->sysfs_pair[0].file[0] != '\0') {
 643                         dbg("check " FIELD_SYSFS " pairs");
 644                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 645                                 dbg(FIELD_SYSFS " is not matching");
 646                                 goto try_parent;
 647                         } else {
 648                                 dbg(FIELD_SYSFS " matches");
 649                         }
 650                 }
 651
 652                 /* execute external program */
 653                 if (dev->program[0] != '\0') {
 654                         char program[PROGRAM_SIZE];
 655
 656                         dbg("check " FIELD_PROGRAM);
 657                         strfieldcpy(program, dev->program);
 658                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 659                         if (execute_program(program, udev->program_result, NAME_SIZE) != 0) {
 660                                 dbg(FIELD_PROGRAM " returned nonzero");
 661                                 goto try_parent;
 662                         } else {
 663                                 dbg(FIELD_PROGRAM " returned successful");
 664                         }
 665                 }
 666
 667                 /* check for matching result of external program */
 668                 if (dev->result[0] != '\0') {
 669                         dbg("check for " FIELD_RESULT
 670                             " dev->result='%s', udev->program_result='%s'",
 671                             dev->result, udev->program_result);
 672                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 673                                 dbg(FIELD_RESULT " is not matching");
 674                                 goto try_parent;
 675                         } else {
 676                                 dbg(FIELD_RESULT " matches");
 677                         }
 678                 }
 679
 680                 /* Yeah, we matched! */
 681                 return 0;
 682
 683 try_parent:
 684                 dbg("try parent sysfs device");
 685                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 686                 if (sysfs_device == NULL)
 687                         return -ENODEV;
 688                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 689                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 690                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 691         }
 692
 693 }
 694
 695 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
 696 {
 697         struct sysfs_class_device *class_dev_parent;
 698         struct sysfs_device *sysfs_device = NULL;
 699         struct config_device *dev;
 700         struct perm_device *perm;
 701         struct sysinfo info;
 702         char *pos;
 703
 704         udev->mode = 0;
 705         dbg("class_dev->name='%s'", class_dev->name);
 706
 707         /* Figure out where the "device"-symlink is at.  For char devices this will
 708          * always be in the class_dev->path.  On block devices, only the main block
 709          * device will have the device symlink in it's path. All partition devices
 710          * need to look at the symlink in its parent directory.
 711          */
 712         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 713         if (class_dev_parent != NULL) {
 714                 dbg("given class device has a parent, use this instead");
 715                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 716         } else {
 717                 sysfs_device = sysfs_get_classdev_device(class_dev);
 718         }
 719
 720         if (sysfs_device) {
 721                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 722                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 723                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 724                 strfieldcpy(udev->bus, sysfs_device->bus);
 725         }
 726
 727         strfieldcpy(udev->kernel_name, class_dev->name);
 728         fix_kernel_name(udev);
 729         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 730
 731         /* get kernel number */
 732         pos = class_dev->name + strlen(class_dev->name);
 733         while (isdigit(*(pos-1)))
 734                 pos--;
 735         strfieldcpy(udev->kernel_number, pos);
 736         dbg("kernel_number='%s'", udev->kernel_number);
 737
 738         /* look for a matching rule to apply */
 739         list_for_each_entry(dev, &config_device_list, node) {
 740                 dbg("process rule");
 741                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 742                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
 743                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 744                                      dev->config_file, dev->config_line, udev->kernel_name);
 745                                 return -1;
 746                         }
 747
 748                         if (dev->symlink[0] != '\0') {
 749                                 char temp[NAME_SIZE];
 750
 751                                 info("configured rule in '%s' at line %i applied, added symlink '%s'",
 752                                      dev->config_file, dev->config_line, dev->symlink);
 753                                 strfieldcpy(temp, dev->symlink);
 754                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 755                                 if (udev->symlink[0] != '\0')
 756                                         strfieldcat(udev->symlink, " ");
 757                                 strfieldcat(udev->symlink, temp);
 758                         }
 759
 760                         if (dev->name[0] != '\0') {
 761                                 /* apply all_partitions flag only at a main block device */
 762                                 if (dev->partitions > 0 &&
 763                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 764                                         continue;
 765
 766                                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 767                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 768                                 strfieldcpy(udev->name, dev->name);
 769                                 goto found;
 770                         }
 771                 }
 772         }
 773         /* no rule was found so we use the kernel name */
 774         strfieldcpy(udev->name, udev->kernel_name);
 775         if (udev->type == 'n')
 776                 goto done;
 777         else
 778                 goto perms;
 779
 780 found:
 781         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 782         strfieldcpy(udev->config_file, dev->config_file);
 783         udev->config_line = dev->config_line;
 784
 785         if (udev->type == 'n')
 786                 goto done;
 787
 788         udev->partitions = dev->partitions;
 789
 790         /* get permissions given in rule */
 791         set_empty_perms(udev, dev->mode,
 792                               dev->owner,
 793                               dev->group);
 794
 795 perms:
 796         /* get permissions given in config file or set defaults */
 797         perm = find_perm(udev->name);
 798         if (perm != NULL) {
 799                 set_empty_perms(udev, perm->mode,
 800                                       perm->owner,
 801                                       perm->group);
 802         } else {
 803                 set_empty_perms(udev, get_default_mode(),
 804                                       get_default_owner(),
 805                                       get_default_group());
 806         }
 807
 808         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 809             udev->name, udev->owner, udev->group, udev->mode);
 810
 811 done:
 812         /* store time of action */
 813         sysinfo(&info);
 814         udev->config_uptime = info.uptime;
 815
 816         return 0;
 817 }
 818
 819 int namedev_init(void)
 820 {
 821         int retval;
 822
 823         retval = namedev_init_rules();
 824         if (retval)
 825                 return retval;
 826
 827         retval = namedev_init_permissions();
 828         if (retval)
 829                 return retval;
 830
 831         dump_config_dev_list();
 832         dump_perm_dev_list();
 833         return retval;
 834 }