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