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                 copy_string(dev, new_dev, symlink);
 125                 return 0;
 126         }
 127
 128         /* not found, add new structure to the device list */
 129         tmp_dev = malloc(sizeof(*tmp_dev));
 130         if (!tmp_dev)
 131                 return -ENOMEM;
 132         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 133         list_add_tail(&tmp_dev->node, &config_device_list);
 134         //dump_config_dev(tmp_dev);
 135         return 0;
 136 }
 137
 138 int add_perm_dev(struct perm_device *new_dev)
 139 {
 140         struct list_head *tmp;
 141         struct perm_device *tmp_dev;
 142
 143         /* update the values if we already have the device */
 144         list_for_each(tmp, &perm_device_list) {
 145                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 146                 if (strcmp_pattern(new_dev->name, dev->name))
 147                         continue;
 148                 copy_var(dev, new_dev, mode);
 149                 copy_string(dev, new_dev, owner);
 150                 copy_string(dev, new_dev, group);
 151                 return 0;
 152         }
 153
 154         /* not found, add new structure to the perm list */
 155         tmp_dev = malloc(sizeof(*tmp_dev));
 156         if (!tmp_dev)
 157                 return -ENOMEM;
 158         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 159         list_add_tail(&tmp_dev->node, &perm_device_list);
 160         //dump_perm_dev(tmp_dev);
 161         return 0;
 162 }
 163
 164 static struct perm_device *find_perm(char *name)
 165 {
 166         struct list_head *tmp;
 167         struct perm_device *perm = NULL;
 168
 169         list_for_each(tmp, &perm_device_list) {
 170                 perm = list_entry(tmp, struct perm_device, node);
 171                 if (strcmp_pattern(perm->name, name))
 172                         continue;
 173                 return perm;
 174         }
 175         return NULL;
 176 }
 177
 178 static mode_t get_default_mode(struct sysfs_class_device *class_dev)
 179 {
 180         mode_t mode = 0600;     /* default to owner rw only */
 181
 182         if (strlen(default_mode_str) != 0) {
 183                 mode = strtol(default_mode_str, NULL, 8);
 184         }
 185         return mode;
 186 }
 187
 188 static void build_kernel_number(struct sysfs_class_device *class_dev, struct udevice *udev)
 189 {
 190         char *dig;
 191
 192         /* FIXME, figure out how to handle stuff like sdaj which will not work right now. */
 193         dig = class_dev->name + strlen(class_dev->name);
 194         while (isdigit(*(dig-1)))
 195                 dig--;
 196         strfieldcpy(udev->kernel_number, dig);
 197         dbg("kernel_number='%s'", udev->kernel_number);
 198 }
 199
 200 static void apply_format(struct udevice *udev, unsigned char *string)
 201 {
 202         char name[NAME_SIZE];
 203         char *pos;
 204
 205         while (1) {
 206                 pos = strchr(string, '%');
 207
 208                 if (pos) {
 209                         strfieldcpy(name, pos+2);
 210                         *pos = 0x00;
 211                         switch (pos[1]) {
 212                         case 'b':
 213                                 if (strlen(udev->bus_id) == 0)
 214                                         break;
 215                                 strcat(pos, udev->bus_id);
 216                                 dbg("substitute bus_id '%s'", udev->bus_id);
 217                                 break;
 218                         case 'n':
 219                                 if (strlen(udev->kernel_number) == 0)
 220                                         break;
 221                                 strcat(pos, udev->kernel_number);
 222                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 223                                 break;
 224                         case 'D':
 225                                 if (strlen(udev->kernel_number) == 0) {
 226                                         strcat(pos, "disk");
 227                                         break;
 228                                 }
 229                                 strcat(pos, "part");
 230                                 strcat(pos, udev->kernel_number);
 231                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 232                                 break;
 233                         case 'm':
 234                                 sprintf(pos, "%u", udev->minor);
 235                                 dbg("substitute minor number '%u'", udev->minor);
 236                                 break;
 237                         case 'M':
 238                                 sprintf(pos, "%u", udev->major);
 239                                 dbg("substitute major number '%u'", udev->major);
 240                                 break;
 241                         case 'c':
 242                                 if (strlen(udev->callout_value) == 0)
 243                                         break;
 244                                 strcat(pos, udev->callout_value);
 245                                 dbg("substitute callout output '%s'", udev->callout_value);
 246                                 break;
 247                         default:
 248                                 dbg("unknown substitution type '%%%c'", pos[1]);
 249                                 break;
 250                         }
 251                         strcat(string, name);
 252                 } else
 253                         break;
 254         }
 255 }
 256
 257
 258 static int exec_callout(struct config_device *dev, char *value, int len)
 259 {
 260         int retval;
 261         int res;
 262         int status;
 263         int fds[2];
 264         pid_t pid;
 265         int value_set = 0;
 266         char buffer[256];
 267         char *arg;
 268         char *args[CALLOUT_MAXARG];
 269         int i;
 270
 271         dbg("callout to '%s'", dev->exec_program);
 272         retval = pipe(fds);
 273         if (retval != 0) {
 274                 dbg("pipe failed");
 275                 return -1;
 276         }
 277         pid = fork();
 278         if (pid == -1) {
 279                 dbg("fork failed");
 280                 return -1;
 281         }
 282
 283         if (pid == 0) {
 284                 /* child */
 285                 close(STDOUT_FILENO);
 286                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 287                 if (strchr(dev->exec_program, ' ')) {
 288                         /* callout with arguments */
 289                         arg = dev->exec_program;
 290                         for (i=0; i < CALLOUT_MAXARG-1; i++) {
 291                                 args[i] = strsep(&arg, " ");
 292                                 if (args[i] == NULL)
 293                                         break;
 294                         }
 295                         if (args[i]) {
 296                                 dbg("too many args - %d", i);
 297                                 args[i] = NULL;
 298                         }
 299                         retval = execve(args[0], args, main_envp);
 300                 } else {
 301                         retval = execve(dev->exec_program, main_argv, main_envp);
 302                 }
 303                 if (retval != 0) {
 304                         dbg("child execve failed");
 305                         exit(1);
 306                 }
 307                 return -1; /* avoid compiler warning */
 308         } else {
 309                 /* parent reads from fds[0] */
 310                 close(fds[1]);
 311                 retval = 0;
 312                 while (1) {
 313                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 314                         if (res <= 0)
 315                                 break;
 316                         buffer[res] = '\0';
 317                         if (res > len) {
 318                                 dbg("callout len %d too short", len);
 319                                 retval = -1;
 320                         }
 321                         if (value_set) {
 322                                 dbg("callout value already set");
 323                                 retval = -1;
 324                         } else {
 325                                 value_set = 1;
 326                                 strncpy(value, buffer, len);
 327                         }
 328                 }
 329                 dbg("callout returned '%s'", value);
 330                 close(fds[0]);
 331                 res = wait(&status);
 332                 if (res < 0) {
 333                         dbg("wait failed result %d", res);
 334                         retval = -1;
 335                 }
 336
 337 #ifndef __KLIBC__
 338                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 339                         dbg("callout program status 0x%x", status);
 340                         retval = -1;
 341                 }
 342 #endif
 343         }
 344         return retval;
 345 }
 346
 347 static int do_callout(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 348 {
 349         struct config_device *dev;
 350         struct list_head *tmp;
 351
 352         list_for_each(tmp, &config_device_list) {
 353                 dev = list_entry(tmp, struct config_device, node);
 354                 if (dev->type != CALLOUT)
 355                         continue;
 356
 357                 if (sysfs_device) {
 358                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 359                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 360                                 continue;
 361                 }
 362
 363                 /* substitute anything that needs to be in the program name */
 364                 apply_format(udev, dev->exec_program);
 365                 if (exec_callout(dev, udev->callout_value, NAME_SIZE))
 366                         continue;
 367                 if (strcmp_pattern(dev->id, udev->callout_value) != 0)
 368                         continue;
 369                 strfieldcpy(udev->name, dev->name);
 370                 strfieldcpy(udev->symlink, dev->symlink);
 371                 dbg("callout returned matching value '%s', '%s' becomes '%s'",
 372                     dev->id, class_dev->name, udev->name);
 373                 return 0;
 374         }
 375         return -ENODEV;
 376 }
 377
 378 static int do_label(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 379 {
 380         struct sysfs_attribute *tmpattr = NULL;
 381         struct config_device *dev;
 382         struct list_head *tmp;
 383         char *c;
 384
 385         list_for_each(tmp, &config_device_list) {
 386                 dev = list_entry(tmp, struct config_device, node);
 387                 if (dev->type != LABEL)
 388                         continue;
 389
 390                 if (sysfs_device) {
 391                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 392                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 393                                 continue;
 394                 }
 395
 396                 dbg("look for device attribute '%s'", dev->sysfs_file);
 397                 /* try to find the attribute in the class device directory */
 398                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 399                 if (tmpattr)
 400                         goto label_found;
 401
 402                 /* look in the class device directory if present */
 403                 if (sysfs_device) {
 404                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 405                         if (tmpattr)
 406                                 goto label_found;
 407                 }
 408
 409                 continue;
 410
 411 label_found:
 412                 c = tmpattr->value + strlen(tmpattr->value)-1;
 413                 if (*c == '\n')
 414                         *c = 0x00;
 415                 dbg("compare attribute '%s' value '%s' with '%s'",
 416                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 417                 if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
 418                         continue;
 419
 420                 strfieldcpy(udev->name, dev->name);
 421                 strfieldcpy(udev->symlink, dev->symlink);
 422                 dbg("found matching attribute '%s', '%s' becomes '%s' ",
 423                     dev->sysfs_file, class_dev->name, udev->name);
 424
 425                 return 0;
 426         }
 427         return -ENODEV;
 428 }
 429
 430 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 431 {
 432         struct config_device *dev;
 433         struct list_head *tmp;
 434         char path[SYSFS_PATH_MAX];
 435         int found;
 436         char *temp = NULL;
 437
 438         /* we have to have a sysfs device for NUMBER to work */
 439         if (!sysfs_device)
 440                 return -ENODEV;
 441
 442         list_for_each(tmp, &config_device_list) {
 443                 dev = list_entry(tmp, struct config_device, node);
 444                 if (dev->type != NUMBER)
 445                         continue;
 446
 447                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 448                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 449                         continue;
 450
 451                 found = 0;
 452                 strfieldcpy(path, sysfs_device->path);
 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                 } else {
 458                         *temp = 0x00;
 459                         temp = strrchr(path, '/');
 460                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 461                         if (strstr(temp, dev->id) != NULL)
 462                                 found = 1;
 463                 }
 464                 if (!found)
 465                         continue;
 466                 strfieldcpy(udev->name, dev->name);
 467                 strfieldcpy(udev->symlink, dev->symlink);
 468                 dbg("found matching id '%s', '%s' becomes '%s'",
 469                     dev->id, class_dev->name, udev->name);
 470                 return 0;
 471         }
 472         return -ENODEV;
 473 }
 474
 475 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 476 {
 477         struct config_device *dev;
 478         struct list_head *tmp;
 479         char path[SYSFS_PATH_MAX];
 480         int found;
 481         char *temp = NULL;
 482
 483         /* we have to have a sysfs device for TOPOLOGY to work */
 484         if (!sysfs_device)
 485                 return -ENODEV;
 486
 487         list_for_each(tmp, &config_device_list) {
 488                 dev = list_entry(tmp, struct config_device, node);
 489                 if (dev->type != TOPOLOGY)
 490                         continue;
 491
 492                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 493                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 494                         continue;
 495
 496                 found = 0;
 497                 strfieldcpy(path, sysfs_device->path);
 498                 temp = strrchr(path, '/');
 499                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 500                 if (strstr(temp, dev->place) != NULL) {
 501                         found = 1;
 502                 } else {
 503                         *temp = 0x00;
 504                         temp = strrchr(path, '/');
 505                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 506                         if (strstr(temp, dev->place) != NULL)
 507                                 found = 1;
 508                 }
 509                 if (!found)
 510                         continue;
 511
 512                 strfieldcpy(udev->name, dev->name);
 513                 strfieldcpy(udev->symlink, dev->symlink);
 514                 dbg("found matching place '%s', '%s' becomes '%s'",
 515                     dev->place, class_dev->name, udev->name);
 516                 return 0;
 517         }
 518         return -ENODEV;
 519 }
 520
 521 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 522 {
 523         struct config_device *dev;
 524         struct list_head *tmp;
 525
 526         list_for_each(tmp, &config_device_list) {
 527                 dev = list_entry(tmp, struct config_device, node);
 528                 if (dev->type != REPLACE)
 529                         continue;
 530
 531                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 532                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 533                         continue;
 534
 535                 strfieldcpy(udev->name, dev->name);
 536                 strfieldcpy(udev->symlink, dev->symlink);
 537                 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
 538
 539                 return 0;
 540         }
 541         return -ENODEV;
 542 }
 543
 544 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 545 {
 546         /* heh, this is pretty simple... */
 547         strfieldcpy(udev->name, class_dev->name);
 548 }
 549
 550 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 551 {
 552         struct sysfs_device *sysfs_device = NULL;
 553         struct sysfs_class_device *class_dev_parent = NULL;
 554         int retval = 0;
 555         char *temp = NULL;
 556         struct perm_device *perm;
 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 */
 628         apply_format(udev, udev->name);
 629         apply_format(udev, udev->symlink);
 630
 631 done:
 632         perm = find_perm(udev->name);
 633         if (perm) {
 634                 udev->mode = perm->mode;
 635                 strfieldcpy(udev->owner, perm->owner);
 636                 strfieldcpy(udev->group, perm->group);
 637         } else {
 638                 /* no matching perms found :( */
 639                 udev->mode = get_default_mode(class_dev);
 640                 udev->owner[0] = 0x00;
 641                 udev->group[0] = 0x00;
 642         }
 643         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 644             udev->name, udev->owner, udev->group, udev->mode);
 645
 646         if (class_dev_parent)
 647                 sysfs_close_class_device(class_dev_parent);
 648
 649         return 0;
 650 }
 651
 652 int namedev_init(void)
 653 {
 654         int retval;
 655
 656         retval = namedev_init_rules();
 657         if (retval)
 658                 return retval;
 659
 660         retval = namedev_init_permissions();
 661         if (retval)
 662                 return retval;
 663
 664         dump_config_dev_list();
 665         dump_perm_dev_list();
 666         return retval;
 667 }