namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <sys/wait.h>
  33
  34 #include "list.h"
  35 #include "udev.h"
  36 #include "udev_version.h"
  37 #include "namedev.h"
  38 #include "libsysfs/libsysfs.h"
  39 #include "klibc_fixups.h"
  40
  41 LIST_HEAD(config_device_list);
  42
  43 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  44 static int strcmp_pattern(const char *p, const char *s)
  45 {
  46         if (*s == '\0') {
  47                 while (*p == '*')
  48                         p++;
  49                 return (*p != '\0');
  50         }
  51         switch (*p) {
  52         case '[':
  53                 {
  54                         int not = 0;
  55                         p++;
  56                         if (*p == '!') {
  57                                 not = 1;
  58                                 p++;
  59                         }
  60                         while (*p && (*p != ']')) {
  61                                 int match = 0;
  62                                 if (p[1] == '-') {
  63                                         if ((*s >= *p) && (*s <= p[2]))
  64                                                 match = 1;
  65                                         p += 3;
  66                                 } else {
  67                                         match = (*p == *s);
  68                                         p++;
  69                                 }
  70                                 if (match ^ not) {
  71                                         while (*p && (*p != ']'))
  72                                                 p++;
  73                                         return strcmp_pattern(p+1, s+1);
  74                                 }
  75                         }
  76                 }
  77                 break;
  78         case '*':
  79                 if (strcmp_pattern(p, s+1))
  80                         return strcmp_pattern(p+1, s);
  81                 return 0;
  82         case '\0':
  83                 if (*s == '\0') {
  84                         return 0;
  85                 }
  86                 break;
  87         default:
  88                 if ((*p == *s) || (*p == '?'))
  89                         return strcmp_pattern(p+1, s+1);
  90                 break;
  91         }
  92         return 1;
  93 }
  94
  95 #define copy_var(a, b, var)             \
  96         if (b->var)                     \
  97                 a->var = b->var;
  98
  99 #define copy_string(a, b, var)          \
 100         if (strlen(b->var))             \
 101                 strcpy(a->var, b->var);
 102
 103 int add_config_dev(struct config_device *new_dev)
 104 {
 105         struct list_head *tmp;
 106         struct config_device *tmp_dev;
 107
 108         /* update the values if we already have the device */
 109         list_for_each(tmp, &config_device_list) {
 110                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 111                 if (strcmp_pattern(new_dev->name, dev->name))
 112                         continue;
 113                 if (strncmp(dev->bus, new_dev->bus, sizeof(dev->name)))
 114                         continue;
 115                 copy_var(dev, new_dev, type);
 116                 copy_var(dev, new_dev, mode);
 117                 copy_string(dev, new_dev, bus);
 118                 copy_string(dev, new_dev, sysfs_file);
 119                 copy_string(dev, new_dev, sysfs_value);
 120                 copy_string(dev, new_dev, id);
 121                 copy_string(dev, new_dev, place);
 122                 copy_string(dev, new_dev, kernel_name);
 123                 copy_string(dev, new_dev, exec_program);
 124                 copy_string(dev, new_dev, owner);
 125                 copy_string(dev, new_dev, group);
 126                 return 0;
 127         }
 128
 129         /* not found, add new structure to the device list */
 130         tmp_dev = malloc(sizeof(*tmp_dev));
 131         if (!tmp_dev)
 132                 return -ENOMEM;
 133         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 134         list_add_tail(&tmp_dev->node, &config_device_list);
 135         //dump_config_dev(tmp_dev);
 136         return 0;
 137 }
 138
 139 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 140 {
 141         mode_t mode = 0600;     /* default to owner rw only */
 142
 143         if (strlen(default_mode_str) != 0) {
 144                 mode = strtol(default_mode_str, NULL, 8);
 145         }
 146         return mode;
 147 }
 148
 149 static void build_kernel_number(struct sysfs_class_device *class_dev, struct udevice *udev)
 150 {
 151         char *dig;
 152
 153         /* FIXME, figure out how to handle stuff like sdaj which will not work right now. */
 154         dig = class_dev->name + strlen(class_dev->name);
 155         while (isdigit(*(dig-1)))
 156                 dig--;
 157         strfieldcpy(udev->kernel_number, dig);
 158         dbg("kernel_number='%s'", udev->kernel_number);
 159 }
 160
 161 static void apply_format(struct udevice *udev, unsigned char *string)
 162 {
 163         char name[NAME_SIZE];
 164         char *pos;
 165
 166         while (1) {
 167                 pos = strchr(string, '%');
 168
 169                 if (pos) {
 170                         strfieldcpy(name, pos+2);
 171                         *pos = 0x00;
 172                         switch (pos[1]) {
 173                         case 'b':
 174                                 if (strlen(udev->bus_id) == 0)
 175                                         break;
 176                                 strcat(pos, udev->bus_id);
 177                                 dbg("substitute bus_id '%s'", udev->bus_id);
 178                                 break;
 179                         case 'n':
 180                                 if (strlen(udev->kernel_number) == 0)
 181                                         break;
 182                                 strcat(pos, udev->kernel_number);
 183                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 184                                 break;
 185                         case 'D':
 186                                 if (strlen(udev->kernel_number) == 0) {
 187                                         strcat(pos, "disk");
 188                                         break;
 189                                 }
 190                                 strcat(pos, "part");
 191                                 strcat(pos, udev->kernel_number);
 192                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 193                                 break;
 194                         case 'm':
 195                                 sprintf(pos, "%u", udev->minor);
 196                                 dbg("substitute minor number '%u'", udev->minor);
 197                                 break;
 198                         case 'M':
 199                                 sprintf(pos, "%u", udev->major);
 200                                 dbg("substitute major number '%u'", udev->major);
 201                                 break;
 202                         case 'c':
 203                                 if (strlen(udev->callout_value) == 0)
 204                                         break;
 205                                 strcat(pos, udev->callout_value);
 206                                 dbg("substitute callout output '%s'", udev->callout_value);
 207                                 break;
 208                         default:
 209                                 dbg("unknown substitution type '%%%c'", pos[1]);
 210                                 break;
 211                         }
 212                         strcat(string, name);
 213                 } else
 214                         break;
 215         }
 216 }
 217
 218
 219 static int exec_callout(struct config_device *dev, char *value, int len)
 220 {
 221         int retval;
 222         int res;
 223         int status;
 224         int fds[2];
 225         pid_t pid;
 226         int value_set = 0;
 227         char buffer[256];
 228         char *arg;
 229         char *args[CALLOUT_MAXARG];
 230         int i;
 231
 232         dbg("callout to '%s'", dev->exec_program);
 233         retval = pipe(fds);
 234         if (retval != 0) {
 235                 dbg("pipe failed");
 236                 return -1;
 237         }
 238         pid = fork();
 239         if (pid == -1) {
 240                 dbg("fork failed");
 241                 return -1;
 242         }
 243
 244         if (pid == 0) {
 245                 /* child */
 246                 close(STDOUT_FILENO);
 247                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 248                 if (strchr(dev->exec_program, ' ')) {
 249                         /* callout with arguments */
 250                         arg = dev->exec_program;
 251                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 252                                 args[i] = strsep(&arg, " ");
 253                                 if (args[i] == NULL)
 254                                         break;
 255                         }
 256                         if (args[i]) {
 257                                 dbg("too many args - %d", i);
 258                                 args[i] = NULL;
 259                         }
 260                         retval = execve(args[0], args, main_envp);
 261                 } else {
 262                         retval = execve(dev->exec_program, main_argv, main_envp);
 263                 }
 264                 if (retval != 0) {
 265                         dbg("child execve failed");
 266                         exit(1);
 267                 }
 268                 return -1; /* avoid compiler warning */
 269         } else {
 270                 /* parent reads from fds[0] */
 271                 close(fds[1]);
 272                 retval = 0;
 273                 while (1) {
 274                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 275                         if (res <= 0)
 276                                 break;
 277                         buffer[res] = '\0';
 278                         if (res > len) {
 279                                 dbg("callout len %d too short", len);
 280                                 retval = -1;
 281                         }
 282                         if (value_set) {
 283                                 dbg("callout value already set");
 284                                 retval = -1;
 285                         } else {
 286                                 value_set = 1;
 287                                 strncpy(value, buffer, len);
 288                         }
 289                 }
 290                 dbg("callout returned '%s'", value);
 291                 close(fds[0]);
 292                 res = wait(&status);
 293                 if (res < 0) {
 294                         dbg("wait failed result %d", res);
 295                         retval = -1;
 296                 }
 297
 298 #ifndef __KLIBC__
 299                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 300                         dbg("callout program status 0x%x", status);
 301                         retval = -1;
 302                 }
 303 #endif
 304         }
 305         return retval;
 306 }
 307
 308 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 309 {
 310         struct config_device *dev;
 311         struct list_head *tmp;
 312
 313         list_for_each(tmp, &config_device_list) {
 314                 dev = list_entry(tmp, struct config_device, node);
 315                 if (dev->type != CALLOUT)
 316                         continue;
 317
 318                 if (sysfs_device) {
 319                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 320                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 321                                 continue;
 322                 }
 323
 324                 /* substitute anything that needs to be in the program name */
 325                 apply_format(udev, dev->exec_program);
 326                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 327                         continue;
 328                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 329                         continue;
 330                 strfieldcpy(udev->name, dev->name);
 331                 if (dev->mode != 0) {
 332                         udev->mode = dev->mode;
 333                         strfieldcpy(udev->owner, dev->owner);
 334                         strfieldcpy(udev->group, dev->group);
 335                 }
 336                 dbg("callout returned matching value '%s', '%s' becomes '%s'"
 337                     " - owner='%s', group='%s', mode=%#o",
 338                     dev->id, class_dev->name, udev->name,
 339                     dev->owner, dev->group, dev->mode);
 340                 return 0;
 341         }
 342         return -ENODEV;
 343 }
 344
 345 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 346 {
 347         struct sysfs_attribute *tmpattr = NULL;
 348         struct config_device *dev;
 349         struct list_head *tmp;
 350
 351         list_for_each(tmp, &config_device_list) {
 352                 dev = list_entry(tmp, struct config_device, node);
 353                 if (dev->type != LABEL)
 354                         continue;
 355
 356                 if (sysfs_device) {
 357                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 358                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 359                                 continue;
 360                 }
 361
 362                 dbg("look for device attribute '%s'", dev->sysfs_file);
 363                 /* try to find the attribute in the class device directory */
 364                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 365                 if (tmpattr)
 366                         goto label_found;
 367
 368                 /* look in the class device directory if present */
 369                 if (sysfs_device) {
 370                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 371                         if (tmpattr)
 372                                 goto label_found;
 373                 }
 374
 375                 continue;
 376
 377 label_found:
 378                 tmpattr->value[strlen(tmpattr->value)-1] = 0x00;
 379                 dbg("compare attribute '%s' value '%s' with '%s'",
 380                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 381                 if (strcmp(dev->sysfs_value, tmpattr->value) != 0)
 382                         continue;
 383
 384                 strfieldcpy(udev->name, dev->name);
 385                 if (dev->mode != 0) {
 386                         udev->mode = dev->mode;
 387                         strfieldcpy(udev->owner, dev->owner);
 388                         strfieldcpy(udev->group, dev->group);
 389                 }
 390                 dbg("found matching attribute '%s', '%s' becomes '%s' "
 391                           "- owner='%s', group='%s', mode=%#o",
 392                           dev->sysfs_file, class_dev->name, udev->name,
 393                           dev->owner, dev->group, dev->mode);
 394
 395                 return 0;
 396         }
 397         return -ENODEV;
 398 }
 399
 400 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 401 {
 402         struct config_device *dev;
 403         struct list_head *tmp;
 404         char path[SYSFS_PATH_MAX];
 405         int found;
 406         char *temp = NULL;
 407
 408         /* we have to have a sysfs device for NUMBER to work */
 409         if (!sysfs_device)
 410                 return -ENODEV;
 411
 412         list_for_each(tmp, &config_device_list) {
 413                 dev = list_entry(tmp, struct config_device, node);
 414                 if (dev->type != NUMBER)
 415                         continue;
 416
 417                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 418                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 419                         continue;
 420
 421                 found = 0;
 422                 strfieldcpy(path, sysfs_device->path);
 423                 temp = strrchr(path, '/');
 424                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 425                 if (strstr(temp, dev->id) != NULL) {
 426                         found = 1;
 427                 } else {
 428                         *temp = 0x00;
 429                         temp = strrchr(path, '/');
 430                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 431                         if (strstr(temp, dev->id) != NULL)
 432                                 found = 1;
 433                 }
 434                 if (!found)
 435                         continue;
 436                 strfieldcpy(udev->name, dev->name);
 437                 if (dev->mode != 0) {
 438                         udev->mode = dev->mode;
 439                         strfieldcpy(udev->owner, dev->owner);
 440                         strfieldcpy(udev->group, dev->group);
 441                 }
 442                 dbg("found matching id '%s', '%s' becomes '%s'"
 443                     " - owner='%s', group ='%s', mode=%#o",
 444                     dev->id, class_dev->name, udev->name,
 445                     dev->owner, dev->group, dev->mode);
 446                 return 0;
 447         }
 448         return -ENODEV;
 449 }
 450
 451 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 452 {
 453         struct config_device *dev;
 454         struct list_head *tmp;
 455         char path[SYSFS_PATH_MAX];
 456         int found;
 457         char *temp = NULL;
 458
 459         /* we have to have a sysfs device for TOPOLOGY to work */
 460         if (!sysfs_device)
 461                 return -ENODEV;
 462
 463         list_for_each(tmp, &config_device_list) {
 464                 dev = list_entry(tmp, struct config_device, node);
 465                 if (dev->type != TOPOLOGY)
 466                         continue;
 467
 468                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 469                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 470                         continue;
 471
 472                 found = 0;
 473                 strfieldcpy(path, sysfs_device->path);
 474                 temp = strrchr(path, '/');
 475                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 476                 if (strstr(temp, dev->place) != NULL) {
 477                         found = 1;
 478                 } else {
 479                         *temp = 0x00;
 480                         temp = strrchr(path, '/');
 481                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 482                         if (strstr(temp, dev->place) != NULL)
 483                                 found = 1;
 484                 }
 485                 if (!found)
 486                         continue;
 487
 488                 strfieldcpy(udev->name, dev->name);
 489                 if (dev->mode != 0) {
 490                         udev->mode = dev->mode;
 491                         strfieldcpy(udev->owner, dev->owner);
 492                         strfieldcpy(udev->group, dev->group);
 493                 }
 494                 dbg("found matching place '%s', '%s' becomes '%s'"
 495                     " - owner='%s', group ='%s', mode=%#o",
 496                     dev->place, class_dev->name, udev->name,
 497                     dev->owner, dev->group, dev->mode);
 498                 return 0;
 499         }
 500         return -ENODEV;
 501 }
 502
 503 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 504 {
 505         struct config_device *dev;
 506         struct list_head *tmp;
 507
 508         list_for_each(tmp, &config_device_list) {
 509                 dev = list_entry(tmp, struct config_device, node);
 510                 if (dev->type != REPLACE)
 511                         continue;
 512
 513                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 514                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 515                         continue;
 516
 517                 strfieldcpy(udev->name, dev->name);
 518                 if (dev->mode != 0) {
 519                         udev->mode = dev->mode;
 520                         strfieldcpy(udev->owner, dev->owner);
 521                         strfieldcpy(udev->group, dev->group);
 522                 }
 523                 dbg("found name, '%s' becomes '%s'"
 524                     " - owner='%s', group='%s', mode = %#o",
 525                     dev->kernel_name, udev->name,
 526                     dev->owner, dev->group, dev->mode);
 527
 528                 return 0;
 529         }
 530         return -ENODEV;
 531 }
 532
 533 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 534 {
 535         struct config_device *dev;
 536         struct list_head *tmp;
 537         int len;
 538
 539         strfieldcpy(udev->name, class_dev->name);
 540         /* look for permissions */
 541         list_for_each(tmp, &config_device_list) {
 542                 dev = list_entry(tmp, struct config_device, node);
 543                 len = strlen(dev->name);
 544                 if (strcmp_pattern(dev->name, class_dev->name))
 545                         continue;
 546                 if (dev->mode != 0) {
 547                         dbg("found permissions for '%s'", class_dev->name);
 548                         udev->mode = dev->mode;
 549                         strfieldcpy(udev->owner, dev->owner);
 550                         strfieldcpy(udev->group, dev->group);
 551                 }
 552         }
 553 }
 554
 555 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 556 {
 557         struct sysfs_device *sysfs_device = NULL;
 558         struct sysfs_class_device *class_dev_parent = NULL;
 559         int retval = 0;
 560         char *temp = NULL;
 561
 562         udev->mode = 0;
 563
 564         /* find the sysfs_device for this class device */
 565         /* Wouldn't it really be nice if libsysfs could do this for us? */
 566         if (class_dev->sysdevice) {
 567                 sysfs_device = class_dev->sysdevice;
 568         } else {
 569                 /* bah, let's go backwards up a level to see if the device is there,
 570                  * as block partitions don't point to the physical device.  Need to fix that
 571                  * up in the kernel...
 572                  */
 573                 if (strstr(class_dev->path, "block")) {
 574                         dbg("looking at block device");
 575                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 576                                 char path[SYSFS_PATH_MAX];
 577
 578                                 dbg("really is a partition");
 579                                 strfieldcpy(path, class_dev->path);
 580                                 temp = strrchr(path, '/');
 581                                 *temp = 0x00;
 582                                 dbg("looking for a class device at '%s'", path);
 583                                 class_dev_parent = sysfs_open_class_device(path);
 584                                 if (class_dev_parent == NULL) {
 585                                         dbg("sysfs_open_class_device at '%s' failed", path);
 586                                 } else {
 587                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 588                                         if (class_dev_parent->sysdevice)
 589                                                 sysfs_device = class_dev_parent->sysdevice;
 590                                 }
 591                         }
 592                 }
 593         }
 594
 595         if (sysfs_device) {
 596                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 597                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 598                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 599                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 600         } else {
 601                 dbg("class_dev->name = '%s'", class_dev->name);
 602         }
 603
 604         build_kernel_number(class_dev, udev);
 605
 606         /* rules are looked at in priority order */
 607         retval = do_callout(class_dev, udev, sysfs_device);
 608         if (retval == 0)
 609                 goto found;
 610
 611         retval = do_label(class_dev, udev, sysfs_device);
 612         if (retval == 0)
 613                 goto found;
 614
 615         retval = do_number(class_dev, udev, sysfs_device);
 616         if (retval == 0)
 617                 goto found;
 618
 619         retval = do_topology(class_dev, udev, sysfs_device);
 620         if (retval == 0)
 621                 goto found;
 622
 623         retval = do_replace(class_dev, udev, sysfs_device);
 624         if (retval == 0)
 625                 goto found;
 626
 627         do_kernelname(class_dev, udev);
 628         goto done;
 629
 630 found:
 631         /* substitute placeholder in NAME  */
 632         apply_format(udev, udev->name);
 633
 634 done:
 635         /* mode was never set above */
 636         if (!udev->mode) {
 637                 udev->mode = get_default_mode(class_dev);
 638                 udev->owner[0] = 0x00;
 639                 udev->group[0] = 0x00;
 640         }
 641
 642         if (class_dev_parent)
 643                 sysfs_close_class_device(class_dev_parent);
 644
 645         return 0;
 646 }
 647
 648 int namedev_init(void)
 649 {
 650         int retval;
 651
 652         retval = namedev_init_rules();
 653         if (retval)
 654                 return retval;
 655
 656         retval = namedev_init_permissions();
 657         if (retval)
 658                 return retval;
 659
 660         dump_config_dev_list();
 661         return retval;
 662 }