namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <time.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35
  36 #include "libsysfs/sysfs/libsysfs.h"
  37 #include "list.h"
  38 #include "udev.h"
  39 #include "udev_version.h"
  40 #include "logging.h"
  41 #include "namedev.h"
  42 #include "klibc_fixups.h"
  43
  44 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  45
  46 LIST_HEAD(config_device_list);
  47 LIST_HEAD(perm_device_list);
  48
  49 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  50 static int strcmp_pattern(const char *p, const char *s)
  51 {
  52         if (s[0] == '\0') {
  53                 while (p[0] == '*')
  54                         p++;
  55                 return (p[0] != '\0');
  56         }
  57         switch (p[0]) {
  58         case '[':
  59                 {
  60                         int not = 0;
  61                         p++;
  62                         if (p[0] == '!') {
  63                                 not = 1;
  64                                 p++;
  65                         }
  66                         while ((p[0] != '\0') && (p[0] != ']')) {
  67                                 int match = 0;
  68                                 if (p[1] == '-') {
  69                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  70                                                 match = 1;
  71                                         p += 3;
  72                                 } else {
  73                                         match = (p[0] == s[0]);
  74                                         p++;
  75                                 }
  76                                 if (match ^ not) {
  77                                         while ((p[0] != '\0') && (p[0] != ']'))
  78                                                 p++;
  79                                         if (p[0] == ']')
  80                                                 return strcmp_pattern(p+1, s+1);
  81                                 }
  82                         }
  83                 }
  84                 break;
  85         case '*':
  86                 if (strcmp_pattern(p, s+1))
  87                         return strcmp_pattern(p+1, s);
  88                 return 0;
  89         case '\0':
  90                 if (s[0] == '\0') {
  91                         return 0;
  92                 }
  93                 break;
  94         default:
  95                 if ((p[0] == s[0]) || (p[0] == '?'))
  96                         return strcmp_pattern(p+1, s+1);
  97                 break;
  98         }
  99         return 1;
 100 }
 101
 102 #define copy_var(a, b, var)             \
 103         if (b->var)                     \
 104                 a->var = b->var;
 105
 106 #define copy_string(a, b, var)          \
 107         if (strlen(b->var))             \
 108                 strcpy(a->var, b->var);
 109
 110 int add_perm_dev(struct perm_device *new_dev)
 111 {
 112         struct perm_device *dev;
 113         struct perm_device *tmp_dev;
 114
 115         /* update the values if we already have the device */
 116         list_for_each_entry(dev, &perm_device_list, node) {
 117                 if (strcmp(new_dev->name, dev->name))
 118                         continue;
 119                 copy_var(dev, new_dev, mode);
 120                 copy_string(dev, new_dev, owner);
 121                 copy_string(dev, new_dev, group);
 122                 return 0;
 123         }
 124
 125         /* not found, add new structure to the perm list */
 126         tmp_dev = malloc(sizeof(*tmp_dev));
 127         if (!tmp_dev)
 128                 return -ENOMEM;
 129         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 130         list_add_tail(&tmp_dev->node, &perm_device_list);
 131         //dump_perm_dev(tmp_dev);
 132         return 0;
 133 }
 134
 135 static struct perm_device *find_perm(char *name)
 136 {
 137         struct perm_device *perm;
 138
 139         list_for_each_entry(perm, &perm_device_list, node) {
 140                 if (strcmp_pattern(perm->name, name))
 141                         continue;
 142                 return perm;
 143         }
 144         return NULL;
 145 }
 146
 147 static mode_t get_default_mode(void)
 148 {
 149         mode_t mode = 0600;     /* default to owner rw only */
 150
 151         if (strlen(default_mode_str) != 0)
 152                 mode = strtol(default_mode_str, NULL, 8);
 153
 154         return mode;
 155 }
 156
 157 static char *get_default_owner(void)
 158 {
 159         if (strlen(default_owner_str) == 0)
 160                 strncpy(default_owner_str, "root", OWNER_SIZE);
 161
 162         return default_owner_str;
 163 }
 164
 165 static char *get_default_group(void)
 166 {
 167         if (strlen(default_group_str) == 0)
 168                 strncpy(default_group_str, "root", GROUP_SIZE);
 169
 170         return default_group_str;
 171 }
 172
 173 /* extract possible {attr} and move str behind it */
 174 static char *get_format_attribute(char **str)
 175 {
 176         char *pos;
 177         char *attr = NULL;
 178
 179         if (*str[0] == '{') {
 180                 pos = strchr(*str, '}');
 181                 if (pos == NULL) {
 182                         dbg("missing closing brace for format");
 183                         return NULL;
 184                 }
 185                 pos[0] = '\0';
 186                 attr = *str+1;
 187                 *str = pos+1;
 188                 dbg("attribute='%s', str='%s'", attr, *str);
 189         }
 190         return attr;
 191 }
 192
 193 /* extract possible format length and move str behind it*/
 194 static int get_format_len(char **str)
 195 {
 196         int num;
 197         char *tail;
 198
 199         if (isdigit(*str[0])) {
 200                 num = (int) strtoul(*str, &tail, 10);
 201                 if (tail != NULL) {
 202                         *str = tail;
 203                         dbg("format length=%i", num);
 204                         return num;
 205                 } else {
 206                         dbg("format parsing error '%s'", *str);
 207                 }
 208         }
 209         return -1;
 210 }
 211
 212 static void apply_format(struct udevice *udev, unsigned char *string, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 213 {
 214         char temp[NAME_SIZE];
 215         char temp1[NAME_SIZE];
 216         char *tail;
 217         char *pos;
 218         char *pos2;
 219         char *pos3;
 220         char *attr;
 221         int num;
 222         int i;
 223         char c;
 224         struct sysfs_attribute *tmpattr;
 225
 226         pos = string;
 227
 228         while (1) {
 229                 pos = strchr(pos, '%');
 230                 if (pos != NULL) {
 231                         pos[0] = '\0';
 232                         tail = pos+1;
 233                         num = get_format_len(&tail);
 234                         c = tail[0];
 235                         strfieldcpy(temp, tail+1);
 236                         tail = temp;
 237                 } else {
 238                         break;
 239                 }
 240                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 241
 242                 attr = get_format_attribute(&tail);
 243
 244                 switch (c) {
 245                 case 'b':
 246                         if (strlen(udev->bus_id) == 0)
 247                                 break;
 248                         strcat(pos, udev->bus_id);
 249                         dbg("substitute bus_id '%s'", udev->bus_id);
 250                         break;
 251                 case 'k':
 252                         if (strlen(udev->kernel_name) == 0)
 253                                 break;
 254                         strcat(pos, udev->kernel_name);
 255                         dbg("substitute kernel name '%s'", udev->kernel_name);
 256                         break;
 257                 case 'n':
 258                         if (strlen(udev->kernel_number) == 0)
 259                                 break;
 260                         strcat(pos, udev->kernel_number);
 261                         dbg("substitute kernel number '%s'", udev->kernel_number);
 262                                 break;
 263                 case 'm':
 264                         sprintf(pos, "%u", udev->minor);
 265                         dbg("substitute minor number '%u'", udev->minor);
 266                         break;
 267                         case 'M':
 268                         sprintf(pos, "%u", udev->major);
 269                         dbg("substitute major number '%u'", udev->major);
 270                         break;
 271                 case 'c':
 272                         if (strlen(udev->program_result) == 0)
 273                                 break;
 274                         /* get part part of the result string */
 275                         i = num; /* num syntax is deprecated and will be removed  */
 276                         if (attr != NULL)
 277                                 i = atoi(attr);
 278                         if (i > 0) {
 279                                 strncpy(temp1, udev->program_result, sizeof(temp1));
 280                                 pos2 = temp1;
 281                                 while (i) {
 282                                         i--;
 283                                         pos3 = strsep(&pos2, " ");
 284                                         if (pos3 == NULL) {
 285                                                 dbg("requested part of result string not found");
 286                                                 break;
 287                                         }
 288                                 }
 289                                 if (pos3) {
 290                                         strcat(pos, pos3);
 291                                         dbg("substitute part of result string '%s'", pos3);
 292                                 }
 293                         } else {
 294                                 strcat(pos, udev->program_result);
 295                                 dbg("substitute result string '%s'", udev->program_result);
 296                         }
 297                         break;
 298                 case 's':
 299                         if (attr != NULL) {
 300                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 301                                 if (tmpattr == NULL) {
 302                                         dbg("sysfa attribute '%s' not found", attr);
 303                                         break;
 304                                 }
 305                                 strcpy(pos, tmpattr->value);
 306                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 307                         } else {
 308                                 dbg("missing attribute");
 309                         }
 310                         break;
 311                 case '%':
 312                         strcat(pos, "%");
 313                         break;
 314                 default:
 315                         dbg("unknown substitution type '%%%c'", c);
 316                         break;
 317                 }
 318                 strcat(pos, tail);
 319         }
 320 }
 321
 322 /*
 323  * Note, we can have multiple files for different busses in here due
 324  * to the mess that USB has for its device tree...
 325  */
 326 static struct bus_file {
 327         char *bus;
 328         char *file;
 329 } bus_files[] = {
 330         { .bus = "scsi",        .file = "vendor" },
 331         { .bus = "usb",         .file = "idVendor" },
 332         { .bus = "usb",         .file = "iInterface" },
 333         { .bus = "usb-serial",  .file = "detach_state" },
 334         { .bus = "ide",         .file = "detach_state" },
 335         { .bus = "pci",         .file = "vendor" },
 336         {}
 337 };
 338
 339 #define SECONDS_TO_WAIT_FOR_FILE        10
 340 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 341 {
 342         /* sleep until we see the file for this specific bus type show up this
 343          * is needed because we can easily out-run the kernel in looking for
 344          * these files before the paticular subsystem has created them in the
 345          * sysfs tree properly.
 346          *
 347          * And people thought that the /sbin/hotplug event system was going to
 348          * be slow, poo on you for arguing that before even testing it...
 349          */
 350         struct bus_file *b = &bus_files[0];
 351         struct sysfs_attribute *tmpattr;
 352         int found = 0;
 353         int loop = SECONDS_TO_WAIT_FOR_FILE;
 354
 355         while (1) {
 356                 if (b->bus == NULL) {
 357                         if (!found)
 358                                 break;
 359                         /* sleep to give the kernel a chance to create the file */
 360                         sleep(1);
 361                         --loop;
 362                         if (loop == 0)
 363                                 break;
 364                         b = &bus_files[0];
 365                 }
 366                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 367                         found = 1;
 368                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 369                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 370                         if (tmpattr) {
 371                                 /* found it! */
 372                                 goto exit;
 373                         }
 374                         dbg("can't find '%s' file", b->file);
 375                 }
 376                 ++b;
 377         }
 378         if (!found)
 379                 dbg("did not find bus type '%s' on list of bus_id_files, "
 380                     "contact greg@kroah.com", sysfs_device->bus);
 381 exit:
 382         return; /* here to prevent compiler warning... */
 383 }
 384
 385 static void fix_kernel_name(struct udevice *udev)
 386 {
 387         char *temp = udev->kernel_name;
 388
 389         while (*temp != 0x00) {
 390                 /* Some block devices have a ! in their name,
 391                  * we need to change that to / */
 392                 if (*temp == '!')
 393                         *temp = '/';
 394                 ++temp;
 395         }
 396 }
 397
 398 static int execute_program(char *path, char *value, int len)
 399 {
 400         int retval;
 401         int res;
 402         int status;
 403         int fds[2];
 404         pid_t pid;
 405         int value_set = 0;
 406         char buffer[256];
 407         char *pos;
 408         char *args[PROGRAM_MAXARG];
 409         int i;
 410
 411         dbg("executing '%s'", path);
 412         retval = pipe(fds);
 413         if (retval != 0) {
 414                 dbg("pipe failed");
 415                 return -1;
 416         }
 417         pid = fork();
 418         switch(pid) {
 419         case 0:
 420                 /* child */
 421                 close(STDOUT_FILENO);
 422                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 423                 if (strchr(path, ' ')) {
 424                         /* exec with arguments */
 425                         pos = path;
 426                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 427                                 args[i] = strsep(&pos, " ");
 428                                 if (args[i] == NULL)
 429                                         break;
 430                         }
 431                         if (args[i]) {
 432                                 dbg("too many args - %d", i);
 433                                 args[i] = NULL;
 434                         }
 435                         retval = execv(args[0], args);
 436                 } else {
 437                         retval = execv(path, main_argv);
 438                 }
 439                 dbg("child execve failed");
 440                 exit(1);
 441         case -1:
 442                 dbg("fork failed");
 443                 return -1;
 444         default:
 445                 /* parent reads from fds[0] */
 446                 close(fds[1]);
 447                 retval = 0;
 448                 while (1) {
 449                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 450                         if (res <= 0)
 451                                 break;
 452                         buffer[res] = '\0';
 453                         if (res > len) {
 454                                 dbg("result len %d too short", len);
 455                                 retval = -1;
 456                         }
 457                         if (value_set) {
 458                                 dbg("result value already set");
 459                                 retval = -1;
 460                         } else {
 461                                 value_set = 1;
 462                                 strncpy(value, buffer, len);
 463                                 pos = value + strlen(value)-1;
 464                                 if (pos[0] == '\n')
 465                                 pos[0] = '\0';
 466                                 dbg("result is '%s'", value);
 467                         }
 468                 }
 469                 close(fds[0]);
 470                 res = wait(&status);
 471                 if (res < 0) {
 472                         dbg("wait failed result %d", res);
 473                         retval = -1;
 474                 }
 475
 476                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 477                         dbg("exec program status 0x%x", status);
 478                         retval = -1;
 479                 }
 480         }
 481         return retval;
 482 }
 483
 484 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 485 {
 486         struct sysfs_attribute *tmpattr = NULL;
 487         char *c;
 488
 489         dbg("look for device attribute '%s'", attr);
 490         /* try to find the attribute in the class device directory */
 491         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 492         if (tmpattr)
 493                 goto attr_found;
 494
 495         /* look in the class device directory if present */
 496         if (sysfs_device) {
 497                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 498                 if (tmpattr)
 499                         goto attr_found;
 500         }
 501
 502         return NULL;
 503
 504 attr_found:
 505         c = strchr(tmpattr->value, '\n');
 506         if (c != NULL)
 507                 c[0] = '\0';
 508
 509         dbg("found attribute '%s'", tmpattr->path);
 510         return tmpattr;
 511 }
 512
 513 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 514 {
 515         struct sysfs_attribute *tmpattr;
 516
 517         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 518                 return -ENODEV;
 519
 520         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 521         if (tmpattr == NULL)
 522                 return -ENODEV;
 523
 524         dbg("compare attribute '%s' value '%s' with '%s'",
 525                   pair->file, tmpattr->value, pair->value);
 526         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 527                 return -ENODEV;
 528
 529         dbg("found matching attribute '%s' with value '%s'",
 530             pair->file, pair->value);
 531         return 0;
 532 }
 533
 534 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 535 {
 536         struct sysfs_pair *pair;
 537         int i;
 538
 539         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 540                 pair = &dev->sysfs_pair[i];
 541                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 542                         break;
 543                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 544                         dbg("sysfs attribute doesn't match");
 545                         return -ENODEV;
 546                 }
 547         }
 548
 549         return 0;
 550 }
 551
 552 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 553 {
 554         char path[SYSFS_PATH_MAX];
 555         char *temp = NULL;
 556
 557         /* we have to have a sysfs device for ID to work */
 558         if (!sysfs_device)
 559                 return -ENODEV;
 560
 561         strfieldcpy(path, sysfs_device->path);
 562         temp = strrchr(path, '/');
 563         temp++;
 564         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 565         if (strcmp_pattern(dev->id, temp) != 0)
 566                 return -ENODEV;
 567         else
 568                 return 0;
 569 }
 570
 571 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 572 {
 573         char path[SYSFS_PATH_MAX];
 574         int found;
 575         char *temp = NULL;
 576
 577         /* we have to have a sysfs device for PLACE to work */
 578         if (!sysfs_device)
 579                 return -ENODEV;
 580
 581         found = 0;
 582         strfieldcpy(path, sysfs_device->path);
 583         temp = strrchr(path, '/');
 584         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 585         if (strstr(temp, dev->place) != NULL) {
 586                 found = 1;
 587         } else {
 588                 *temp = 0x00;
 589                 temp = strrchr(path, '/');
 590                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 591                 if (strstr(temp, dev->place) != NULL)
 592                         found = 1;
 593         }
 594         if (!found) {
 595                 dbg("place doesn't match");
 596                 return -ENODEV;
 597         }
 598
 599         return 0;
 600 }
 601
 602 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 603 {
 604         struct sysfs_device *sysfs_device;
 605         struct sysfs_class_device *class_dev_parent;
 606         struct timespec tspec;
 607         int loop;
 608
 609         /* Figure out where the device symlink is at.  For char devices this will
 610          * always be in the class_dev->path.  But for block devices, it's different.
 611          * The main block device will have the device symlink in it's path, but
 612          * all partitions have the symlink in its parent directory.
 613          * But we need to watch out for block devices that do not have parents, yet
 614          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 615          * symlink yet.  We do sit and spin on waiting for them right now, we should
 616          * possibly have a whitelist for these devices here...
 617          */
 618         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 619         if (class_dev_parent)
 620                 dbg("Really a partition");
 621
 622         tspec.tv_sec = 0;
 623         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 624         loop = 10;
 625         while (loop--) {
 626                 if (udev_sleep)
 627                         nanosleep(&tspec, NULL);
 628                 if (class_dev_parent)
 629                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 630                 else
 631                         sysfs_device = sysfs_get_classdev_device(class_dev);
 632
 633                 if (sysfs_device != NULL)
 634                         goto device_found;
 635         }
 636         dbg("timed out waiting for device symlink, continuing on anyway...");
 637
 638 device_found:
 639         /* We have another issue with just the wait above - the sysfs part of
 640          * the kernel may not be quick enough to have created the link to the
 641          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 642          * will not contain the actual bus name :(
 643          *
 644          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 645          * if needed
 646          */
 647         if (sysfs_device) {
 648                 if (sysfs_device->bus[0] != '\0')
 649                         goto bus_found;
 650
 651                 loop = 10;
 652                 tspec.tv_nsec = 10000000;
 653                 while (loop--) {
 654                         if (udev_sleep)
 655                                 nanosleep(&tspec, NULL);
 656                         sysfs_get_device_bus(sysfs_device);
 657
 658                         if (sysfs_device->bus[0] != '\0')
 659                                 goto bus_found;
 660                 }
 661                 dbg("timed out waiting to find the device bus, continuing on anyway");
 662                 goto exit;
 663 bus_found:
 664                 dbg("device %s is registered with bus '%s'",
 665                                 sysfs_device->name, sysfs_device->bus);
 666         }
 667 exit:
 668         return sysfs_device;
 669 }
 670
 671 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 672 {
 673         while (1) {
 674                 /* check for matching bus value */
 675                 if (dev->bus[0] != '\0') {
 676                         if (sysfs_device == NULL) {
 677                                 dbg("device has no bus");
 678                                 goto try_parent;
 679                         }
 680                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 681                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 682                                 dbg(FIELD_BUS " is not matching");
 683                                 goto try_parent;
 684                         } else {
 685                                 dbg(FIELD_BUS " matches");
 686                         }
 687                 }
 688
 689                 /* check for matching kernel name*/
 690                 if (dev->kernel[0] != '\0') {
 691                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 692                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 693                                 dbg(FIELD_KERNEL " is not matching");
 694                                 goto try_parent;
 695                         } else {
 696                                 dbg(FIELD_KERNEL " matches");
 697                         }
 698                 }
 699
 700                 /* check for matching bus id */
 701                 if (dev->id[0] != '\0') {
 702                         dbg("check " FIELD_ID);
 703                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 704                                 dbg(FIELD_ID " is not matching");
 705                                 goto try_parent;
 706                         } else {
 707                                 dbg(FIELD_ID " matches");
 708                         }
 709                 }
 710
 711                 /* check for matching place of device */
 712                 if (dev->place[0] != '\0') {
 713                         dbg("check " FIELD_PLACE);
 714                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 715                                 dbg(FIELD_PLACE " is not matching");
 716                                 goto try_parent;
 717                         } else {
 718                                 dbg(FIELD_PLACE " matches");
 719                         }
 720                 }
 721
 722                 /* check for matching sysfs pairs */
 723                 if (dev->sysfs_pair[0].file[0] != '\0') {
 724                         dbg("check " FIELD_SYSFS " pairs");
 725                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 726                                 dbg(FIELD_SYSFS " is not matching");
 727                                 goto try_parent;
 728                         } else {
 729                                 dbg(FIELD_SYSFS " matches");
 730                         }
 731                 }
 732
 733                 /* execute external program */
 734                 if (dev->program[0] != '\0') {
 735                         dbg("check " FIELD_PROGRAM);
 736                         apply_format(udev, dev->program, class_dev, sysfs_device);
 737                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 738                                 dbg(FIELD_PROGRAM " returned nozero");
 739                                 goto try_parent;
 740                         } else {
 741                                 dbg(FIELD_PROGRAM " returned successful");
 742                         }
 743                 }
 744
 745                 /* check for matching result of external program */
 746                 if (dev->result[0] != '\0') {
 747                         dbg("check for " FIELD_RESULT
 748                             " dev->result='%s', udev->program_result='%s'",
 749                             dev->result, udev->program_result);
 750                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 751                                 dbg(FIELD_RESULT " is not matching");
 752                                 goto try_parent;
 753                         } else {
 754                                 dbg(FIELD_RESULT " matches");
 755                         }
 756                 }
 757
 758                 /* Yeah, we matched! */
 759                 return 0;
 760
 761 try_parent:
 762                 dbg("try parent sysfs device");
 763                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 764                 if (sysfs_device == NULL)
 765                         return -ENODEV;
 766                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 767                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 768                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 769         }
 770
 771 }
 772
 773 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 774 {
 775         struct sysfs_device *sysfs_device = NULL;
 776         struct config_device *dev;
 777         struct perm_device *perm;
 778         char *pos;
 779
 780         udev->mode = 0;
 781
 782         /* find the sysfs_device associated with this class device */
 783         sysfs_device = get_sysfs_device(class_dev);
 784         if (sysfs_device) {
 785                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 786                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 787                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 788                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 789                 wait_for_device_to_initialize(sysfs_device);
 790         }
 791         dbg("class_dev->name = '%s'", class_dev->name);
 792
 793         strfieldcpy(udev->kernel_name, class_dev->name);
 794         fix_kernel_name(udev);
 795         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 796
 797         /* get kernel number */
 798         pos = class_dev->name + strlen(class_dev->name);
 799         while (isdigit(*(pos-1)))
 800                 pos--;
 801         strfieldcpy(udev->kernel_number, pos);
 802         dbg("kernel_number='%s'", udev->kernel_number);
 803
 804         /* look for a matching rule to apply */
 805         list_for_each_entry(dev, &config_device_list, node) {
 806                 dbg("process rule");
 807                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 808                         if (dev->name[0] == '\0') {
 809                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 810                                      udev_rules_filename, dev->config_line, udev->kernel_name);
 811                                 return -1;
 812                         }
 813
 814                         info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 815                              udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
 816                         strfieldcpy(udev->name, dev->name);
 817                         strfieldcpy(udev->symlink, dev->symlink);
 818                         goto found;
 819                 }
 820         }
 821
 822         /* no rule was found so we use the kernel name */
 823         strfieldcpy(udev->name, udev->kernel_name);
 824         goto done;
 825
 826 found:
 827         /* substitute placeholder */
 828         apply_format(udev, udev->name, class_dev, sysfs_device);
 829         apply_format(udev, udev->symlink, class_dev, sysfs_device);
 830         udev->partitions = dev->partitions;
 831 done:
 832         perm = find_perm(udev->name);
 833         if (perm) {
 834                 udev->mode = perm->mode;
 835                 strfieldcpy(udev->owner, perm->owner);
 836                 strfieldcpy(udev->group, perm->group);
 837         } else {
 838                 /* no matching perms found :( */
 839                 udev->mode = get_default_mode();
 840                 strncpy(udev->owner, get_default_owner(), OWNER_SIZE);
 841                 strncpy(udev->group, get_default_group(), GROUP_SIZE);
 842         }
 843         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 844             udev->name, udev->owner, udev->group, udev->mode);
 845
 846         return 0;
 847 }
 848
 849 int namedev_init(void)
 850 {
 851         int retval;
 852
 853         retval = namedev_init_rules();
 854         if (retval)
 855                 return retval;
 856
 857         retval = namedev_init_permissions();
 858         if (retval)
 859                 return retval;
 860
 861         dump_config_dev_list();
 862         dump_perm_dev_list();
 863         return retval;
 864 }