namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <time.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35 #include <sys/sysinfo.h>
  36
  37 #include "libsysfs/sysfs/libsysfs.h"
  38 #include "list.h"
  39 #include "udev.h"
  40 #include "udev_lib.h"
  41 #include "udev_version.h"
  42 #include "logging.h"
  43 #include "namedev.h"
  44 #include "klibc_fixups.h"
  45 #include "udevdb.h"
  46
  47 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  48
  49 LIST_HEAD(config_device_list);
  50 LIST_HEAD(perm_device_list);
  51
  52
  53 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  54 static int strcmp_pattern(const char *p, const char *s)
  55 {
  56         if (s[0] == '\0') {
  57                 while (p[0] == '*')
  58                         p++;
  59                 return (p[0] != '\0');
  60         }
  61         switch (p[0]) {
  62         case '[':
  63                 {
  64                         int not = 0;
  65                         p++;
  66                         if (p[0] == '!') {
  67                                 not = 1;
  68                                 p++;
  69                         }
  70                         while ((p[0] != '\0') && (p[0] != ']')) {
  71                                 int match = 0;
  72                                 if (p[1] == '-') {
  73                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  74                                                 match = 1;
  75                                         p += 3;
  76                                 } else {
  77                                         match = (p[0] == s[0]);
  78                                         p++;
  79                                 }
  80                                 if (match ^ not) {
  81                                         while ((p[0] != '\0') && (p[0] != ']'))
  82                                                 p++;
  83                                         if (p[0] == ']')
  84                                                 return strcmp_pattern(p+1, s+1);
  85                                 }
  86                         }
  87                 }
  88                 break;
  89         case '*':
  90                 if (strcmp_pattern(p, s+1))
  91                         return strcmp_pattern(p+1, s);
  92                 return 0;
  93         case '\0':
  94                 if (s[0] == '\0') {
  95                         return 0;
  96                 }
  97                 break;
  98         default:
  99                 if ((p[0] == s[0]) || (p[0] == '?'))
 100                         return strcmp_pattern(p+1, s+1);
 101                 break;
 102         }
 103         return 1;
 104 }
 105
 106 static struct perm_device *find_perm(char *name)
 107 {
 108         struct perm_device *perm;
 109
 110         list_for_each_entry(perm, &perm_device_list, node) {
 111                 if (strcmp_pattern(perm->name, name))
 112                         continue;
 113                 return perm;
 114         }
 115         return NULL;
 116 }
 117
 118 static mode_t get_default_mode(void)
 119 {
 120         mode_t mode = 0600;     /* default to owner rw only */
 121
 122         if (strlen(default_mode_str) != 0)
 123                 mode = strtol(default_mode_str, NULL, 8);
 124
 125         return mode;
 126 }
 127
 128 static char *get_default_owner(void)
 129 {
 130         if (strlen(default_owner_str) == 0)
 131                 strfieldcpy(default_owner_str, "root");
 132
 133         return default_owner_str;
 134 }
 135
 136 static char *get_default_group(void)
 137 {
 138         if (strlen(default_group_str) == 0)
 139                 strfieldcpy(default_group_str, "root");
 140
 141         return default_group_str;
 142 }
 143
 144 /* extract possible {attr} and move str behind it */
 145 static char *get_format_attribute(char **str)
 146 {
 147         char *pos;
 148         char *attr = NULL;
 149
 150         if (*str[0] == '{') {
 151                 pos = strchr(*str, '}');
 152                 if (pos == NULL) {
 153                         dbg("missing closing brace for format");
 154                         return NULL;
 155                 }
 156                 pos[0] = '\0';
 157                 attr = *str+1;
 158                 *str = pos+1;
 159                 dbg("attribute='%s', str='%s'", attr, *str);
 160         }
 161         return attr;
 162 }
 163
 164 /* extract possible format length and move str behind it*/
 165 static int get_format_len(char **str)
 166 {
 167         int num;
 168         char *tail;
 169
 170         if (isdigit(*str[0])) {
 171                 num = (int) strtoul(*str, &tail, 10);
 172                 if (num > 0) {
 173                         *str = tail;
 174                         dbg("format length=%i", num);
 175                         return num;
 176                 } else {
 177                         dbg("format parsing error '%s'", *str);
 178                 }
 179         }
 180         return -1;
 181 }
 182
 183 /** Finds the lowest positive N such that <name>N isn't present in
 184  *  $(udevroot) either as a file or a symlink.
 185  *
 186  *  @param  name                Name to check for
 187  *  @return                     0 if <name> didn't exist and N otherwise.
 188  */
 189 static unsigned int find_free_number (struct udevice *udev, char *name)
 190 {
 191         char temp[NAME_SIZE];
 192         char path[NAME_SIZE];
 193         struct udevice dev;
 194         int result;
 195
 196         /* have to sweep the database for each lookup */
 197         result = 0;
 198         strncpy(temp, name, sizeof (temp));
 199         while (1) {
 200                 if (udevdb_get_dev_byname(temp, path, &dev) != 0)
 201                         goto found;
 202                 /* symlink might be stale if $(udevroot) isn't cleaned; check
 203                  * on major/minor to see if it's the same device
 204                  */
 205                 if (dev.major == udev->major && dev.minor == udev->minor)
 206                         goto found;
 207                 snprintf (temp, sizeof(temp), "%s%d", name, ++result);
 208         }
 209
 210 found:
 211         return result;
 212 }
 213
 214 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 215                          struct sysfs_class_device *class_dev,
 216                          struct sysfs_device *sysfs_device)
 217 {
 218         char temp[NAME_SIZE];
 219         char temp2[NAME_SIZE];
 220         char *tail;
 221         char *pos;
 222         char *attr;
 223         int len;
 224         int i;
 225         char c;
 226         char *spos;
 227         char *rest;
 228         int slen;
 229         struct sysfs_attribute *tmpattr;
 230         unsigned int next_free_number;
 231
 232         pos = string;
 233         while (1) {
 234                 pos = strchr(pos, '%');
 235                 if (pos == NULL)
 236                         break;
 237
 238                 pos[0] = '\0';
 239                 tail = pos+1;
 240                 len = get_format_len(&tail);
 241                 c = tail[0];
 242                 strfieldcpy(temp, tail+1);
 243                 tail = temp;
 244                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 245                 attr = get_format_attribute(&tail);
 246
 247
 248                 switch (c) {
 249                 case 'b':
 250                         if (strlen(udev->bus_id) == 0)
 251                                 break;
 252                         strfieldcatmax(string, udev->bus_id, maxsize);
 253                         dbg("substitute bus_id '%s'", udev->bus_id);
 254                         break;
 255                 case 'k':
 256                         if (strlen(udev->kernel_name) == 0)
 257                                 break;
 258                         strfieldcatmax(string, udev->kernel_name, maxsize);
 259                         dbg("substitute kernel name '%s'", udev->kernel_name);
 260                         break;
 261                 case 'n':
 262                         if (strlen(udev->kernel_number) == 0)
 263                                 break;
 264                         strfieldcatmax(string, udev->kernel_number, maxsize);
 265                         dbg("substitute kernel number '%s'", udev->kernel_number);
 266                                 break;
 267                 case 'm':
 268                         strintcatmax(string, udev->minor, maxsize);
 269                         dbg("substitute minor number '%u'", udev->minor);
 270                         break;
 271                 case 'M':
 272                         strintcatmax(string, udev->major, maxsize);
 273                         dbg("substitute major number '%u'", udev->major);
 274                         break;
 275                 case 'c':
 276                         if (strlen(udev->program_result) == 0)
 277                                 break;
 278                         /* get part part of the result string */
 279                         i = 0;
 280                         if (attr != NULL)
 281                                 i = strtoul(attr, &rest, 10);
 282                         if (i > 0) {
 283                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 284                                         i--;
 285                                         if (i == 0)
 286                                                 break;
 287                                 }
 288                                 if (i > 0) {
 289                                         dbg("requested part of result string not found");
 290                                         break;
 291                                 }
 292                                 if (rest[0] == '+')
 293                                         strfieldcpy(temp2, spos);
 294                                 else
 295                                         strfieldcpymax(temp2, spos, slen+1);
 296                                 strfieldcatmax(string, temp2, maxsize);
 297                                 dbg("substitute part of result string '%s'", temp2);
 298                         } else {
 299                                 strfieldcatmax(string, udev->program_result, maxsize);
 300                                 dbg("substitute result string '%s'", udev->program_result);
 301                         }
 302                         break;
 303                 case 's':
 304                         if (attr != NULL) {
 305                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 306                                 if (tmpattr == NULL) {
 307                                         dbg("sysfa attribute '%s' not found", attr);
 308                                         break;
 309                                 }
 310                                 strfieldcatmax(string, tmpattr->value, maxsize);
 311                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 312                         } else {
 313                                 dbg("missing attribute");
 314                         }
 315                         break;
 316                 case '%':
 317                         strfieldcatmax(string, "%", maxsize);
 318                         pos++;
 319                         break;
 320                 case 'e':
 321                         next_free_number = find_free_number(udev, string);
 322                         if (next_free_number > 0) {
 323                                 snprintf(temp2, sizeof(temp2), "%d", next_free_number);
 324                                 strfieldcatmax(string, temp2, maxsize);
 325                         }
 326                         break;
 327                 default:
 328                         dbg("unknown substitution type '%%%c'", c);
 329                         break;
 330                 }
 331                 /* truncate to specified length */
 332                 if (len > 0)
 333                         pos[len] = '\0';
 334
 335                 strfieldcatmax(string, tail, maxsize);
 336         }
 337 }
 338
 339 /*
 340  * Note, we can have multiple files for different busses in here due
 341  * to the mess that USB has for its device tree...
 342  */
 343 static struct bus_file {
 344         char *bus;
 345         char *file;
 346 } bus_files[] = {
 347         { .bus = "scsi",        .file = "vendor" },
 348         { .bus = "usb",         .file = "idVendor" },
 349         { .bus = "usb",         .file = "iInterface" },
 350         { .bus = "usb-serial",  .file = "detach_state" },
 351         { .bus = "ide",         .file = "detach_state" },
 352         { .bus = "pci",         .file = "vendor" },
 353         {}
 354 };
 355
 356 #define SECONDS_TO_WAIT_FOR_FILE        10
 357 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 358 {
 359         /* sleep until we see the file for this specific bus type show up this
 360          * is needed because we can easily out-run the kernel in looking for
 361          * these files before the paticular subsystem has created them in the
 362          * sysfs tree properly.
 363          *
 364          * And people thought that the /sbin/hotplug event system was going to
 365          * be slow, poo on you for arguing that before even testing it...
 366          */
 367         struct bus_file *b = &bus_files[0];
 368         struct sysfs_attribute *tmpattr;
 369         int found = 0;
 370         int loop = SECONDS_TO_WAIT_FOR_FILE;
 371
 372         while (1) {
 373                 if (b->bus == NULL) {
 374                         if (!found)
 375                                 break;
 376                         /* sleep to give the kernel a chance to create the file */
 377                         sleep(1);
 378                         --loop;
 379                         if (loop == 0)
 380                                 break;
 381                         b = &bus_files[0];
 382                 }
 383                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 384                         found = 1;
 385                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 386                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 387                         if (tmpattr) {
 388                                 /* found it! */
 389                                 goto exit;
 390                         }
 391                         dbg("can't find '%s' file", b->file);
 392                 }
 393                 ++b;
 394         }
 395         if (!found)
 396                 dbg("did not find bus type '%s' on list of bus_id_files, "
 397                     "contact greg@kroah.com", sysfs_device->bus);
 398 exit:
 399         return; /* here to prevent compiler warning... */
 400 }
 401
 402 static void fix_kernel_name(struct udevice *udev)
 403 {
 404         char *temp = udev->kernel_name;
 405
 406         while (*temp != 0x00) {
 407                 /* Some block devices have a ! in their name,
 408                  * we need to change that to / */
 409                 if (*temp == '!')
 410                         *temp = '/';
 411                 ++temp;
 412         }
 413 }
 414
 415 static int execute_program(char *path, char *value, int len)
 416 {
 417         int retval;
 418         int count;
 419         int status;
 420         int fds[2];
 421         pid_t pid;
 422         char *pos;
 423         char arg[PROGRAM_SIZE];
 424         char *argv[sizeof(arg) / 2];
 425         int i;
 426
 427         i = 0;
 428         if (strchr(path, ' ')) {
 429                 strfieldcpy(arg, path);
 430                 pos = arg;
 431                 while (pos != NULL) {
 432                         if (pos[0] == '\'') {
 433                                 /* don't separate if in apostrophes */
 434                                 pos++;
 435                                 argv[i] = strsep(&pos, "\'");
 436                                 while (pos && pos[0] == ' ')
 437                                         pos++;
 438                         } else {
 439                                 argv[i] = strsep(&pos, " ");
 440                         }
 441                         dbg("arg[%i] '%s'", i, argv[i]);
 442                         i++;
 443                 }
 444         }
 445         argv[i] =  NULL;
 446
 447         retval = pipe(fds);
 448         if (retval != 0) {
 449                 dbg("pipe failed");
 450                 return -1;
 451         }
 452
 453         pid = fork();
 454         switch(pid) {
 455         case 0:
 456                 /* child */
 457                 /* dup2 write side of pipe to STDOUT */
 458                 dup2(fds[1], STDOUT_FILENO);
 459                 if (argv[0] !=  NULL) {
 460                         dbg("execute '%s' with given arguments", argv[0]);
 461                         retval = execv(argv[0], argv);
 462                 } else {
 463                         dbg("execute '%s' with main argument", path);
 464                         retval = execv(path, main_argv);
 465                 }
 466
 467                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 468                 exit(1);
 469         case -1:
 470                 dbg("fork failed");
 471                 return -1;
 472         default:
 473                 /* parent reads from fds[0] */
 474                 close(fds[1]);
 475                 retval = 0;
 476                 i = 0;
 477                 while (1) {
 478                         count = read(fds[0], value + i, len - i-1);
 479                         if (count <= 0)
 480                                 break;
 481
 482                         i += count;
 483                         if (i >= len-1) {
 484                                 dbg("result len %d too short", len);
 485                                 retval = -1;
 486                                 break;
 487                         }
 488                 }
 489
 490                 if (count < 0) {
 491                         dbg("read failed with '%s'", strerror(errno));
 492                         retval = -1;
 493                 }
 494
 495                 if (i > 0 && value[i-1] == '\n')
 496                         i--;
 497                 value[i] = '\0';
 498                 dbg("result is '%s'", value);
 499
 500                 close(fds[0]);
 501                 wait(&status);
 502
 503                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 504                         dbg("exec program status 0x%x", status);
 505                         retval = -1;
 506                 }
 507         }
 508         return retval;
 509 }
 510
 511 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 512 {
 513         struct sysfs_attribute *tmpattr = NULL;
 514         char *c;
 515
 516         dbg("look for device attribute '%s'", attr);
 517         /* try to find the attribute in the class device directory */
 518         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 519         if (tmpattr)
 520                 goto attr_found;
 521
 522         /* look in the class device directory if present */
 523         if (sysfs_device) {
 524                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 525                 if (tmpattr)
 526                         goto attr_found;
 527         }
 528
 529         return NULL;
 530
 531 attr_found:
 532         c = strchr(tmpattr->value, '\n');
 533         if (c != NULL)
 534                 c[0] = '\0';
 535
 536         dbg("found attribute '%s'", tmpattr->path);
 537         return tmpattr;
 538 }
 539
 540 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 541 {
 542         struct sysfs_attribute *tmpattr;
 543         int i;
 544         int len;
 545
 546         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 547                 return -ENODEV;
 548
 549         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 550         if (tmpattr == NULL)
 551                 return -ENODEV;
 552
 553         /* strip trailing whitespace of value, if not asked to match for it */
 554         if (! isspace(pair->value[strlen(pair->value)-1])) {
 555                 i = len = strlen(tmpattr->value);
 556                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 557                         i--;
 558                 if (i < len) {
 559                         tmpattr->value[i] = '\0';
 560                         dbg("remove %i trailing whitespace chars from '%s'",
 561                             len - i, tmpattr->value);
 562                 }
 563         }
 564
 565         dbg("compare attribute '%s' value '%s' with '%s'",
 566                   pair->file, tmpattr->value, pair->value);
 567         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 568                 return -ENODEV;
 569
 570         dbg("found matching attribute '%s' with value '%s'",
 571             pair->file, pair->value);
 572         return 0;
 573 }
 574
 575 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 576 {
 577         struct sysfs_pair *pair;
 578         int i;
 579
 580         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 581                 pair = &dev->sysfs_pair[i];
 582                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 583                         break;
 584                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 585                         dbg("sysfs attribute doesn't match");
 586                         return -ENODEV;
 587                 }
 588         }
 589
 590         return 0;
 591 }
 592
 593 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 594 {
 595         char path[SYSFS_PATH_MAX];
 596         char *temp = NULL;
 597
 598         /* we have to have a sysfs device for ID to work */
 599         if (!sysfs_device)
 600                 return -ENODEV;
 601
 602         strfieldcpy(path, sysfs_device->path);
 603         temp = strrchr(path, '/');
 604         temp++;
 605         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 606         if (strcmp_pattern(dev->id, temp) != 0)
 607                 return -ENODEV;
 608         else
 609                 return 0;
 610 }
 611
 612 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 613 {
 614         char path[SYSFS_PATH_MAX];
 615         int found;
 616         char *temp = NULL;
 617
 618         /* we have to have a sysfs device for PLACE to work */
 619         if (!sysfs_device)
 620                 return -ENODEV;
 621
 622         found = 0;
 623         strfieldcpy(path, sysfs_device->path);
 624         temp = strrchr(path, '/');
 625         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 626         if (strstr(temp, dev->place) != NULL) {
 627                 found = 1;
 628         } else {
 629                 *temp = 0x00;
 630                 temp = strrchr(path, '/');
 631                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 632                 if (strstr(temp, dev->place) != NULL)
 633                         found = 1;
 634         }
 635         if (!found) {
 636                 dbg("place doesn't match");
 637                 return -ENODEV;
 638         }
 639
 640         return 0;
 641 }
 642
 643 static int whitelist_search(struct sysfs_class_device *class_dev)
 644 {
 645         char *sysblock = "/sys/block";
 646         int i;
 647
 648         static char *list[] = {
 649                 "nb",
 650                 "ram",
 651                 "loop",
 652                 "fd",
 653                 "md",
 654                 "dos_cd",
 655                 "double",
 656                 "flash",
 657                 "msd",
 658                 "rflash",
 659                 "rom",
 660                 "rrom",
 661                 "sbpcd",
 662                 "pcd",
 663                 "pf",
 664                 "scd",
 665                 "ubd",
 666                 NULL,
 667         };
 668
 669         if (strncmp(class_dev->path, sysblock, strlen(sysblock)))
 670                 return 0;
 671
 672         for (i=0; list[i] != NULL; i++)
 673                 if (!strncmp(class_dev->name, list[i], strlen(list[i])))
 674                         return 1;
 675
 676         return 0;
 677 }
 678
 679 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 680 {
 681         struct sysfs_device *sysfs_device;
 682         struct sysfs_class_device *class_dev_parent;
 683         struct timespec tspec;
 684         int loop;
 685
 686         /* Figure out where the device symlink is at.  For char devices this will
 687          * always be in the class_dev->path.  But for block devices, it's different.
 688          * The main block device will have the device symlink in it's path, but
 689          * all partitions have the symlink in its parent directory.
 690          * But we need to watch out for block devices that do not have parents, yet
 691          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 692          * symlink yet.  We do sit and spin on waiting for them right now unless
 693          * they happen to be in the whitelist in which case we exit.
 694          */
 695         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 696         if (class_dev_parent != NULL)
 697                 dbg("given class device has a parent, use this instead");
 698
 699         tspec.tv_sec = 0;
 700         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 701         loop = 10;
 702         while (loop--) {
 703                 if (udev_sleep) {
 704                         if (whitelist_search(class_dev)) {
 705                                 sysfs_device = NULL;
 706                                 goto exit;
 707                         }
 708                         nanosleep(&tspec, NULL);
 709                 }
 710
 711                 if (class_dev_parent)
 712                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 713                 else
 714                         sysfs_device = sysfs_get_classdev_device(class_dev);
 715                 if (sysfs_device != NULL)
 716                         goto device_found;
 717         }
 718         dbg("timed out waiting for device symlink, continuing on anyway...");
 719
 720 device_found:
 721         /* We have another issue with just the wait above - the sysfs part of
 722          * the kernel may not be quick enough to have created the link to the
 723          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 724          * will not contain the actual bus name :(
 725          */
 726         if (sysfs_device) {
 727                 if (sysfs_device->bus[0] != '\0')
 728                         goto bus_found;
 729
 730                 loop = 10;
 731                 tspec.tv_nsec = 10000000;
 732                 while (loop--) {
 733                         if (udev_sleep)
 734                                 nanosleep(&tspec, NULL);
 735                         sysfs_get_device_bus(sysfs_device);
 736
 737                         if (sysfs_device->bus[0] != '\0')
 738                                 goto bus_found;
 739                 }
 740                 dbg("timed out waiting to find the device bus, continuing on anyway");
 741                 goto exit;
 742 bus_found:
 743                 dbg("device %s is registered with bus '%s'",
 744                                 sysfs_device->name, sysfs_device->bus);
 745         }
 746 exit:
 747         return sysfs_device;
 748 }
 749
 750 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 751 {
 752         while (1) {
 753                 /* check for matching bus value */
 754                 if (dev->bus[0] != '\0') {
 755                         if (sysfs_device == NULL) {
 756                                 dbg("device has no bus");
 757                                 goto try_parent;
 758                         }
 759                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 760                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 761                                 dbg(FIELD_BUS " is not matching");
 762                                 goto try_parent;
 763                         } else {
 764                                 dbg(FIELD_BUS " matches");
 765                         }
 766                 }
 767
 768                 /* check for matching kernel name*/
 769                 if (dev->kernel[0] != '\0') {
 770                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 771                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 772                                 dbg(FIELD_KERNEL " is not matching");
 773                                 goto try_parent;
 774                         } else {
 775                                 dbg(FIELD_KERNEL " matches");
 776                         }
 777                 }
 778
 779                 /* check for matching bus id */
 780                 if (dev->id[0] != '\0') {
 781                         dbg("check " FIELD_ID);
 782                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 783                                 dbg(FIELD_ID " is not matching");
 784                                 goto try_parent;
 785                         } else {
 786                                 dbg(FIELD_ID " matches");
 787                         }
 788                 }
 789
 790                 /* check for matching place of device */
 791                 if (dev->place[0] != '\0') {
 792                         dbg("check " FIELD_PLACE);
 793                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 794                                 dbg(FIELD_PLACE " is not matching");
 795                                 goto try_parent;
 796                         } else {
 797                                 dbg(FIELD_PLACE " matches");
 798                         }
 799                 }
 800
 801                 /* check for matching sysfs pairs */
 802                 if (dev->sysfs_pair[0].file[0] != '\0') {
 803                         dbg("check " FIELD_SYSFS " pairs");
 804                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 805                                 dbg(FIELD_SYSFS " is not matching");
 806                                 goto try_parent;
 807                         } else {
 808                                 dbg(FIELD_SYSFS " matches");
 809                         }
 810                 }
 811
 812                 /* execute external program */
 813                 if (dev->program[0] != '\0') {
 814                         char program[PROGRAM_SIZE];
 815
 816                         dbg("check " FIELD_PROGRAM);
 817                         strfieldcpy(program, dev->program);
 818                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 819                         if (execute_program(program, udev->program_result, NAME_SIZE) != 0) {
 820                                 dbg(FIELD_PROGRAM " returned nonzero");
 821                                 goto try_parent;
 822                         } else {
 823                                 dbg(FIELD_PROGRAM " returned successful");
 824                         }
 825                 }
 826
 827                 /* check for matching result of external program */
 828                 if (dev->result[0] != '\0') {
 829                         dbg("check for " FIELD_RESULT
 830                             " dev->result='%s', udev->program_result='%s'",
 831                             dev->result, udev->program_result);
 832                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 833                                 dbg(FIELD_RESULT " is not matching");
 834                                 goto try_parent;
 835                         } else {
 836                                 dbg(FIELD_RESULT " matches");
 837                         }
 838                 }
 839
 840                 /* Yeah, we matched! */
 841                 return 0;
 842
 843 try_parent:
 844                 dbg("try parent sysfs device");
 845                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 846                 if (sysfs_device == NULL)
 847                         return -ENODEV;
 848                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 849                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 850                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 851         }
 852
 853 }
 854
 855 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 856 {
 857         struct sysfs_device *sysfs_device = NULL;
 858         struct config_device *dev;
 859         struct perm_device *perm;
 860         struct sysinfo info;
 861         char *pos;
 862
 863         udev->mode = 0;
 864
 865         /* find the sysfs_device associated with this class device */
 866         sysfs_device = get_sysfs_device(class_dev);
 867         if (sysfs_device) {
 868                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 869                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 870                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 871                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 872                 wait_for_device_to_initialize(sysfs_device);
 873         }
 874         dbg("class_dev->name = '%s'", class_dev->name);
 875
 876         strfieldcpy(udev->kernel_name, class_dev->name);
 877         fix_kernel_name(udev);
 878         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 879
 880         /* get kernel number */
 881         pos = class_dev->name + strlen(class_dev->name);
 882         while (isdigit(*(pos-1)))
 883                 pos--;
 884         strfieldcpy(udev->kernel_number, pos);
 885         dbg("kernel_number='%s'", udev->kernel_number);
 886
 887         /* look for a matching rule to apply */
 888         list_for_each_entry(dev, &config_device_list, node) {
 889                 dbg("process rule");
 890                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 891                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
 892                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 893                                      dev->config_file, dev->config_line, udev->kernel_name);
 894                                 return -1;
 895                         }
 896
 897                         if (dev->symlink[0] != '\0') {
 898                                 char temp[NAME_SIZE];
 899
 900                                 info("configured rule in '%s' at line %i applied, added symlink '%s'",
 901                                      dev->config_file, dev->config_line, dev->symlink);
 902                                 strfieldcpy(temp, dev->symlink);
 903                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 904                                 if (udev->symlink[0] != '\0')
 905                                         strfieldcat(udev->symlink, " ");
 906                                 strfieldcat(udev->symlink, temp);
 907                         }
 908
 909                         if (dev->name[0] != '\0') {
 910                                 /* apply all_partitions flag only at a main block device */
 911                                 if (dev->partitions > 0 &&
 912                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 913                                         continue;
 914
 915                                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 916                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 917                                 strfieldcpy(udev->name, dev->name);
 918                                 goto found;
 919                         }
 920                 }
 921         }
 922         /* no rule was found so we use the kernel name */
 923         strfieldcpy(udev->name, udev->kernel_name);
 924         if (udev->type == 'n')
 925                 goto done;
 926         else
 927                 goto perms;
 928
 929 found:
 930         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 931         strfieldcpy(udev->config_file, dev->config_file);
 932         udev->config_line = dev->config_line;
 933
 934         if (udev->type == 'n')
 935                 goto done;
 936
 937         udev->partitions = dev->partitions;
 938
 939         /* get permissions given in rule */
 940         set_empty_perms(udev, dev->mode,
 941                               dev->owner,
 942                               dev->group);
 943
 944 perms:
 945         /* get permissions given in config file or set defaults */
 946         perm = find_perm(udev->name);
 947         if (perm != NULL) {
 948                 set_empty_perms(udev, perm->mode,
 949                                       perm->owner,
 950                                       perm->group);
 951         } else {
 952                 set_empty_perms(udev, get_default_mode(),
 953                                       get_default_owner(),
 954                                       get_default_group());
 955         }
 956
 957         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 958             udev->name, udev->owner, udev->group, udev->mode);
 959
 960 done:
 961         /* store time of action */
 962         sysinfo(&info);
 963         udev->config_uptime = info.uptime;
 964
 965         return 0;
 966 }
 967
 968 int namedev_init(void)
 969 {
 970         int retval;
 971
 972         retval = namedev_init_rules();
 973         if (retval)
 974                 return retval;
 975
 976         retval = namedev_init_permissions();
 977         if (retval)
 978                 return retval;
 979
 980         dump_config_dev_list();
 981         dump_perm_dev_list();
 982         return retval;
 983 }