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