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         /* just default everyone to rw for the world! */
 142         return 0666;
 143 }
 144
 145 static void build_kernel_number(struct sysfs_class_device *class_dev, struct udevice *udev)
 146 {
 147         char *dig;
 148
 149         /* FIXME, figure out how to handle stuff like sdaj which will not work right now. */
 150         dig = class_dev->name + strlen(class_dev->name);
 151         while (isdigit(*(dig-1)))
 152                 dig--;
 153         strfieldcpy(udev->kernel_number, dig);
 154         dbg("kernel_number='%s'", udev->kernel_number);
 155 }
 156
 157 static void apply_format(struct udevice *udev, unsigned char *string)
 158 {
 159         char name[NAME_SIZE];
 160         char *pos;
 161
 162         while (1) {
 163                 pos = strchr(string, '%');
 164
 165                 if (pos) {
 166                         strfieldcpy(name, pos+2);
 167                         *pos = 0x00;
 168                         switch (pos[1]) {
 169                         case 'b':
 170                                 if (strlen(udev->bus_id) == 0)
 171                                         break;
 172                                 strcat(pos, udev->bus_id);
 173                                 dbg("substitute bus_id '%s'", udev->bus_id);
 174                                 break;
 175                         case 'n':
 176                                 if (strlen(udev->kernel_number) == 0)
 177                                         break;
 178                                 strcat(pos, udev->kernel_number);
 179                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 180                                 break;
 181                         case 'D':
 182                                 if (strlen(udev->kernel_number) == 0) {
 183                                         strcat(pos, "disk");
 184                                         break;
 185                                 }
 186                                 strcat(pos, "part");
 187                                 strcat(pos, udev->kernel_number);
 188                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 189                                 break;
 190                         case 'm':
 191                                 sprintf(pos, "%u", udev->minor);
 192                                 dbg("substitute minor number '%u'", udev->minor);
 193                                 break;
 194                         case 'M':
 195                                 sprintf(pos, "%u", udev->major);
 196                                 dbg("substitute major number '%u'", udev->major);
 197                                 break;
 198                         case 'c':
 199                                 if (strlen(udev->callout_value) == 0)
 200                                         break;
 201                                 strcat(pos, udev->callout_value);
 202                                 dbg("substitute callout output '%s'", udev->callout_value);
 203                                 break;
 204                         default:
 205                                 dbg("unknown substitution type '%%%c'", pos[1]);
 206                                 break;
 207                         }
 208                         strcat(string, name);
 209                 } else
 210                         break;
 211         }
 212 }
 213
 214
 215 static int exec_callout(struct config_device *dev, char *value, int len)
 216 {
 217         int retval;
 218         int res;
 219         int status;
 220         int fds[2];
 221         pid_t pid;
 222         int value_set = 0;
 223         char buffer[256];
 224         char *arg;
 225         char *args[CALLOUT_MAXARG];
 226         int i;
 227
 228         dbg("callout to '%s'", dev->exec_program);
 229         retval = pipe(fds);
 230         if (retval != 0) {
 231                 dbg("pipe failed");
 232                 return -1;
 233         }
 234         pid = fork();
 235         if (pid == -1) {
 236                 dbg("fork failed");
 237                 return -1;
 238         }
 239
 240         if (pid == 0) {
 241                 /* child */
 242                 close(STDOUT_FILENO);
 243                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 244                 if (strchr(dev->exec_program, ' ')) {
 245                         /* callout with arguments */
 246                         arg = dev->exec_program;
 247                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 248                                 args[i] = strsep(&arg, " ");
 249                                 if (args[i] == NULL)
 250                                         break;
 251                         }
 252                         if (args[i]) {
 253                                 dbg("too many args - %d", i);
 254                                 args[i] = NULL;
 255                         }
 256                         retval = execve(args[0], args, main_envp);
 257                 } else {
 258                         retval = execve(dev->exec_program, main_argv, main_envp);
 259                 }
 260                 if (retval != 0) {
 261                         dbg("child execve failed");
 262                         exit(1);
 263                 }
 264                 return -1; /* avoid compiler warning */
 265         } else {
 266                 /* parent reads from fds[0] */
 267                 close(fds[1]);
 268                 retval = 0;
 269                 while (1) {
 270                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 271                         if (res <= 0)
 272                                 break;
 273                         buffer[res] = '\0';
 274                         if (res > len) {
 275                                 dbg("callout len %d too short", len);
 276                                 retval = -1;
 277                         }
 278                         if (value_set) {
 279                                 dbg("callout value already set");
 280                                 retval = -1;
 281                         } else {
 282                                 value_set = 1;
 283                                 strncpy(value, buffer, len);
 284                         }
 285                 }
 286                 dbg("callout returned '%s'", value);
 287                 close(fds[0]);
 288                 res = wait(&status);
 289                 if (res < 0) {
 290                         dbg("wait failed result %d", res);
 291                         retval = -1;
 292                 }
 293
 294 #ifndef __KLIBC__
 295                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 296                         dbg("callout program status 0x%x", status);
 297                         retval = -1;
 298                 }
 299 #endif
 300         }
 301         return retval;
 302 }
 303
 304 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 305 {
 306         struct config_device *dev;
 307         struct list_head *tmp;
 308
 309         list_for_each(tmp, &config_device_list) {
 310                 dev = list_entry(tmp, struct config_device, node);
 311                 if (dev->type != CALLOUT)
 312                         continue;
 313
 314                 if (sysfs_device) {
 315                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 316                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 317                                 continue;
 318                 }
 319
 320                 /* substitute anything that needs to be in the program name */
 321                 apply_format(udev, dev->exec_program);
 322                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 323                         continue;
 324                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 325                         continue;
 326                 strfieldcpy(udev->name, dev->name);
 327                 if (dev->mode != 0) {
 328                         udev->mode = dev->mode;
 329                         strfieldcpy(udev->owner, dev->owner);
 330                         strfieldcpy(udev->group, dev->group);
 331                 }
 332                 dbg("callout returned matching value '%s', '%s' becomes '%s'"
 333                     " - owner='%s', group='%s', mode=%#o",
 334                     dev->id, class_dev->name, udev->name,
 335                     dev->owner, dev->group, dev->mode);
 336                 return 0;
 337         }
 338         return -ENODEV;
 339 }
 340
 341 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 342 {
 343         struct sysfs_attribute *tmpattr = NULL;
 344         struct config_device *dev;
 345         struct list_head *tmp;
 346
 347         list_for_each(tmp, &config_device_list) {
 348                 dev = list_entry(tmp, struct config_device, node);
 349                 if (dev->type != LABEL)
 350                         continue;
 351
 352                 if (sysfs_device) {
 353                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 354                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 355                                 continue;
 356                 }
 357
 358                 dbg("look for device attribute '%s'", dev->sysfs_file);
 359                 /* try to find the attribute in the class device directory */
 360                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 361                 if (tmpattr)
 362                         goto label_found;
 363
 364                 /* look in the class device directory if present */
 365                 if (sysfs_device) {
 366                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 367                         if (tmpattr)
 368                                 goto label_found;
 369                 }
 370
 371                 continue;
 372
 373 label_found:
 374                 tmpattr->value[strlen(tmpattr->value)-1] = 0x00;
 375                 dbg("compare attribute '%s' value '%s' with '%s'",
 376                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 377                 if (strcmp(dev->sysfs_value, tmpattr->value) != 0)
 378                         continue;
 379
 380                 strfieldcpy(udev->name, dev->name);
 381                 if (dev->mode != 0) {
 382                         udev->mode = dev->mode;
 383                         strfieldcpy(udev->owner, dev->owner);
 384                         strfieldcpy(udev->group, dev->group);
 385                 }
 386                 dbg("found matching attribute '%s', '%s' becomes '%s' "
 387                           "- owner='%s', group='%s', mode=%#o",
 388                           dev->sysfs_file, class_dev->name, udev->name,
 389                           dev->owner, dev->group, dev->mode);
 390
 391                 return 0;
 392         }
 393         return -ENODEV;
 394 }
 395
 396 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 397 {
 398         struct config_device *dev;
 399         struct list_head *tmp;
 400         char path[SYSFS_PATH_MAX];
 401         int found;
 402         char *temp = NULL;
 403
 404         /* we have to have a sysfs device for NUMBER to work */
 405         if (!sysfs_device)
 406                 return -ENODEV;
 407
 408         list_for_each(tmp, &config_device_list) {
 409                 dev = list_entry(tmp, struct config_device, node);
 410                 if (dev->type != NUMBER)
 411                         continue;
 412
 413                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 414                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 415                         continue;
 416
 417                 found = 0;
 418                 strfieldcpy(path, sysfs_device->path);
 419                 temp = strrchr(path, '/');
 420                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 421                 if (strstr(temp, dev->id) != NULL) {
 422                         found = 1;
 423                 } else {
 424                         *temp = 0x00;
 425                         temp = strrchr(path, '/');
 426                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 427                         if (strstr(temp, dev->id) != NULL)
 428                                 found = 1;
 429                 }
 430                 if (!found)
 431                         continue;
 432                 strfieldcpy(udev->name, dev->name);
 433                 if (dev->mode != 0) {
 434                         udev->mode = dev->mode;
 435                         strfieldcpy(udev->owner, dev->owner);
 436                         strfieldcpy(udev->group, dev->group);
 437                 }
 438                 dbg("found matching id '%s', '%s' becomes '%s'"
 439                     " - owner='%s', group ='%s', mode=%#o",
 440                     dev->id, class_dev->name, udev->name,
 441                     dev->owner, dev->group, dev->mode);
 442                 return 0;
 443         }
 444         return -ENODEV;
 445 }
 446
 447 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 448 {
 449         struct config_device *dev;
 450         struct list_head *tmp;
 451         char path[SYSFS_PATH_MAX];
 452         int found;
 453         char *temp = NULL;
 454
 455         /* we have to have a sysfs device for TOPOLOGY to work */
 456         if (!sysfs_device)
 457                 return -ENODEV;
 458
 459         list_for_each(tmp, &config_device_list) {
 460                 dev = list_entry(tmp, struct config_device, node);
 461                 if (dev->type != TOPOLOGY)
 462                         continue;
 463
 464                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 465                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 466                         continue;
 467
 468                 found = 0;
 469                 strfieldcpy(path, sysfs_device->path);
 470                 temp = strrchr(path, '/');
 471                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 472                 if (strstr(temp, dev->place) != NULL) {
 473                         found = 1;
 474                 } else {
 475                         *temp = 0x00;
 476                         temp = strrchr(path, '/');
 477                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 478                         if (strstr(temp, dev->place) != NULL)
 479                                 found = 1;
 480                 }
 481                 if (!found)
 482                         continue;
 483
 484                 strfieldcpy(udev->name, dev->name);
 485                 if (dev->mode != 0) {
 486                         udev->mode = dev->mode;
 487                         strfieldcpy(udev->owner, dev->owner);
 488                         strfieldcpy(udev->group, dev->group);
 489                 }
 490                 dbg("found matching place '%s', '%s' becomes '%s'"
 491                     " - owner='%s', group ='%s', mode=%#o",
 492                     dev->place, class_dev->name, udev->name,
 493                     dev->owner, dev->group, dev->mode);
 494                 return 0;
 495         }
 496         return -ENODEV;
 497 }
 498
 499 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 500 {
 501         struct config_device *dev;
 502         struct list_head *tmp;
 503
 504         list_for_each(tmp, &config_device_list) {
 505                 dev = list_entry(tmp, struct config_device, node);
 506                 if (dev->type != REPLACE)
 507                         continue;
 508
 509                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 510                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 511                         continue;
 512
 513                 strfieldcpy(udev->name, dev->name);
 514                 if (dev->mode != 0) {
 515                         udev->mode = dev->mode;
 516                         strfieldcpy(udev->owner, dev->owner);
 517                         strfieldcpy(udev->group, dev->group);
 518                 }
 519                 dbg("found name, '%s' becomes '%s'"
 520                     " - owner='%s', group='%s', mode = %#o",
 521                     dev->kernel_name, udev->name,
 522                     dev->owner, dev->group, dev->mode);
 523
 524                 return 0;
 525         }
 526         return -ENODEV;
 527 }
 528
 529 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 530 {
 531         struct config_device *dev;
 532         struct list_head *tmp;
 533         int len;
 534
 535         strfieldcpy(udev->name, class_dev->name);
 536         /* look for permissions */
 537         list_for_each(tmp, &config_device_list) {
 538                 dev = list_entry(tmp, struct config_device, node);
 539                 len = strlen(dev->name);
 540                 if (strcmp_pattern(dev->name, class_dev->name))
 541                         continue;
 542                 if (dev->mode != 0) {
 543                         dbg("found permissions for '%s'", class_dev->name);
 544                         udev->mode = dev->mode;
 545                         strfieldcpy(udev->owner, dev->owner);
 546                         strfieldcpy(udev->group, dev->group);
 547                 }
 548         }
 549 }
 550
 551 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 552 {
 553         struct sysfs_device *sysfs_device = NULL;
 554         struct sysfs_class_device *class_dev_parent = NULL;
 555         int retval = 0;
 556         char *temp = NULL;
 557
 558         udev->mode = 0;
 559
 560         /* find the sysfs_device for this class device */
 561         /* Wouldn't it really be nice if libsysfs could do this for us? */
 562         if (class_dev->sysdevice) {
 563                 sysfs_device = class_dev->sysdevice;
 564         } else {
 565                 /* bah, let's go backwards up a level to see if the device is there,
 566                  * as block partitions don't point to the physical device.  Need to fix that
 567                  * up in the kernel...
 568                  */
 569                 if (strstr(class_dev->path, "block")) {
 570                         dbg("looking at block device");
 571                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 572                                 char path[SYSFS_PATH_MAX];
 573
 574                                 dbg("really is a partition");
 575                                 strfieldcpy(path, class_dev->path);
 576                                 temp = strrchr(path, '/');
 577                                 *temp = 0x00;
 578                                 dbg("looking for a class device at '%s'", path);
 579                                 class_dev_parent = sysfs_open_class_device(path);
 580                                 if (class_dev_parent == NULL) {
 581                                         dbg("sysfs_open_class_device at '%s' failed", path);
 582                                 } else {
 583                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 584                                         if (class_dev_parent->sysdevice)
 585                                                 sysfs_device = class_dev_parent->sysdevice;
 586                                 }
 587                         }
 588                 }
 589         }
 590
 591         if (sysfs_device) {
 592                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 593                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 594                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 595                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 596         } else {
 597                 dbg("class_dev->name = '%s'", class_dev->name);
 598         }
 599
 600         build_kernel_number(class_dev, udev);
 601
 602         /* rules are looked at in priority order */
 603         retval = do_callout(class_dev, udev, sysfs_device);
 604         if (retval == 0)
 605                 goto found;
 606
 607         retval = do_label(class_dev, udev, sysfs_device);
 608         if (retval == 0)
 609                 goto found;
 610
 611         retval = do_number(class_dev, udev, sysfs_device);
 612         if (retval == 0)
 613                 goto found;
 614
 615         retval = do_topology(class_dev, udev, sysfs_device);
 616         if (retval == 0)
 617                 goto found;
 618
 619         retval = do_replace(class_dev, udev, sysfs_device);
 620         if (retval == 0)
 621                 goto found;
 622
 623         do_kernelname(class_dev, udev);
 624         goto done;
 625
 626 found:
 627         /* substitute placeholder in NAME  */
 628         apply_format(udev, udev->name);
 629
 630 done:
 631         /* mode was never set above */
 632         if (!udev->mode) {
 633                 udev->mode = get_default_mode(class_dev);
 634                 udev->owner[0] = 0x00;
 635                 udev->group[0] = 0x00;
 636         }
 637
 638         if (class_dev_parent)
 639                 sysfs_close_class_device(class_dev_parent);
 640
 641         return 0;
 642 }
 643
 644 int namedev_init(void)
 645 {
 646         int retval;
 647
 648         retval = namedev_init_rules();
 649         if (retval)
 650                 return retval;
 651
 652         retval = namedev_init_permissions();
 653         if (retval)
 654                 return retval;
 655
 656         dump_config_dev_list();
 657         return retval;
 658 }