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         char *c;
 382
 383         list_for_each(tmp, &config_device_list) {
 384                 dev = list_entry(tmp, struct config_device, node);
 385                 if (dev->type != LABEL)
 386                         continue;
 387
 388                 if (sysfs_device) {
 389                         dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 390                         if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 391                                 continue;
 392                 }
 393
 394                 dbg("look for device attribute '%s'", dev->sysfs_file);
 395                 /* try to find the attribute in the class device directory */
 396                 tmpattr = sysfs_get_classdev_attr(class_dev, dev->sysfs_file);
 397                 if (tmpattr)
 398                         goto label_found;
 399
 400                 /* look in the class device directory if present */
 401                 if (sysfs_device) {
 402                         tmpattr = sysfs_get_device_attr(sysfs_device, dev->sysfs_file);
 403                         if (tmpattr)
 404                                 goto label_found;
 405                 }
 406
 407                 continue;
 408
 409 label_found:
 410                 c = tmpattr->value + strlen(tmpattr->value)-1;
 411                 if (*c == '\n')
 412                         *c = 0x00;
 413                 dbg("compare attribute '%s' value '%s' with '%s'",
 414                           dev->sysfs_file, tmpattr->value, dev->sysfs_value);
 415                 if (strcmp_pattern(dev->sysfs_value, tmpattr->value) != 0)
 416                         continue;
 417
 418                 strfieldcpy(udev->name, dev->name);
 419                 dbg("found matching attribute '%s', '%s' becomes '%s' ",
 420                     dev->sysfs_file, class_dev->name, udev->name);
 421
 422                 return 0;
 423         }
 424         return -ENODEV;
 425 }
 426
 427 static int do_number(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 428 {
 429         struct config_device *dev;
 430         struct list_head *tmp;
 431         char path[SYSFS_PATH_MAX];
 432         int found;
 433         char *temp = NULL;
 434
 435         /* we have to have a sysfs device for NUMBER to work */
 436         if (!sysfs_device)
 437                 return -ENODEV;
 438
 439         list_for_each(tmp, &config_device_list) {
 440                 dev = list_entry(tmp, struct config_device, node);
 441                 if (dev->type != NUMBER)
 442                         continue;
 443
 444                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 445                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 446                         continue;
 447
 448                 found = 0;
 449                 strfieldcpy(path, sysfs_device->path);
 450                 temp = strrchr(path, '/');
 451                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 452                 if (strstr(temp, dev->id) != NULL) {
 453                         found = 1;
 454                 } else {
 455                         *temp = 0x00;
 456                         temp = strrchr(path, '/');
 457                         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 458                         if (strstr(temp, dev->id) != NULL)
 459                                 found = 1;
 460                 }
 461                 if (!found)
 462                         continue;
 463                 strfieldcpy(udev->name, dev->name);
 464                 dbg("found matching id '%s', '%s' becomes '%s'",
 465                     dev->id, class_dev->name, udev->name);
 466                 return 0;
 467         }
 468         return -ENODEV;
 469 }
 470
 471 static int do_topology(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 472 {
 473         struct config_device *dev;
 474         struct list_head *tmp;
 475         char path[SYSFS_PATH_MAX];
 476         int found;
 477         char *temp = NULL;
 478
 479         /* we have to have a sysfs device for TOPOLOGY to work */
 480         if (!sysfs_device)
 481                 return -ENODEV;
 482
 483         list_for_each(tmp, &config_device_list) {
 484                 dev = list_entry(tmp, struct config_device, node);
 485                 if (dev->type != TOPOLOGY)
 486                         continue;
 487
 488                 dbg("dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 489                 if (strcasecmp(dev->bus, sysfs_device->bus) != 0)
 490                         continue;
 491
 492                 found = 0;
 493                 strfieldcpy(path, sysfs_device->path);
 494                 temp = strrchr(path, '/');
 495                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 496                 if (strstr(temp, dev->place) != NULL) {
 497                         found = 1;
 498                 } else {
 499                         *temp = 0x00;
 500                         temp = strrchr(path, '/');
 501                         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 502                         if (strstr(temp, dev->place) != NULL)
 503                                 found = 1;
 504                 }
 505                 if (!found)
 506                         continue;
 507
 508                 strfieldcpy(udev->name, dev->name);
 509                 dbg("found matching place '%s', '%s' becomes '%s'",
 510                     dev->place, class_dev->name, udev->name);
 511                 return 0;
 512         }
 513         return -ENODEV;
 514 }
 515
 516 static int do_replace(struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 517 {
 518         struct config_device *dev;
 519         struct list_head *tmp;
 520
 521         list_for_each(tmp, &config_device_list) {
 522                 dev = list_entry(tmp, struct config_device, node);
 523                 if (dev->type != REPLACE)
 524                         continue;
 525
 526                 dbg("compare name '%s' with '%s'", dev->kernel_name, class_dev->name);
 527                 if (strcmp_pattern(dev->kernel_name, class_dev->name) != 0)
 528                         continue;
 529
 530                 strfieldcpy(udev->name, dev->name);
 531                 dbg("found name, '%s' becomes '%s'", dev->kernel_name, udev->name);
 532
 533                 return 0;
 534         }
 535         return -ENODEV;
 536 }
 537
 538 static void do_kernelname(struct sysfs_class_device *class_dev, struct udevice *udev)
 539 {
 540         /* heh, this is pretty simple... */
 541         strfieldcpy(udev->name, class_dev->name);
 542 }
 543
 544 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 545 {
 546         struct sysfs_device *sysfs_device = NULL;
 547         struct sysfs_class_device *class_dev_parent = NULL;
 548         int retval = 0;
 549         char *temp = NULL;
 550         struct perm_device *perm;
 551
 552         udev->mode = 0;
 553
 554         /* find the sysfs_device for this class device */
 555         /* Wouldn't it really be nice if libsysfs could do this for us? */
 556         if (class_dev->sysdevice) {
 557                 sysfs_device = class_dev->sysdevice;
 558         } else {
 559                 /* bah, let's go backwards up a level to see if the device is there,
 560                  * as block partitions don't point to the physical device.  Need to fix that
 561                  * up in the kernel...
 562                  */
 563                 if (strstr(class_dev->path, "block")) {
 564                         dbg("looking at block device");
 565                         if (isdigit(class_dev->path[strlen(class_dev->path)-1])) {
 566                                 char path[SYSFS_PATH_MAX];
 567
 568                                 dbg("really is a partition");
 569                                 strfieldcpy(path, class_dev->path);
 570                                 temp = strrchr(path, '/');
 571                                 *temp = 0x00;
 572                                 dbg("looking for a class device at '%s'", path);
 573                                 class_dev_parent = sysfs_open_class_device(path);
 574                                 if (class_dev_parent == NULL) {
 575                                         dbg("sysfs_open_class_device at '%s' failed", path);
 576                                 } else {
 577                                         dbg("class_dev_parent->name='%s'", class_dev_parent->name);
 578                                         if (class_dev_parent->sysdevice)
 579                                                 sysfs_device = class_dev_parent->sysdevice;
 580                                 }
 581                         }
 582                 }
 583         }
 584
 585         if (sysfs_device) {
 586                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 587                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 588                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 589                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 590         } else {
 591                 dbg("class_dev->name = '%s'", class_dev->name);
 592         }
 593
 594         build_kernel_number(class_dev, udev);
 595
 596         /* rules are looked at in priority order */
 597         retval = do_callout(class_dev, udev, sysfs_device);
 598         if (retval == 0)
 599                 goto found;
 600
 601         retval = do_label(class_dev, udev, sysfs_device);
 602         if (retval == 0)
 603                 goto found;
 604
 605         retval = do_number(class_dev, udev, sysfs_device);
 606         if (retval == 0)
 607                 goto found;
 608
 609         retval = do_topology(class_dev, udev, sysfs_device);
 610         if (retval == 0)
 611                 goto found;
 612
 613         retval = do_replace(class_dev, udev, sysfs_device);
 614         if (retval == 0)
 615                 goto found;
 616
 617         do_kernelname(class_dev, udev);
 618         goto done;
 619
 620 found:
 621         /* substitute placeholder in NAME  */
 622         apply_format(udev, udev->name);
 623
 624 done:
 625         perm = find_perm(udev->name);
 626         if (perm) {
 627                 udev->mode = perm->mode;
 628                 strfieldcpy(udev->owner, perm->owner);
 629                 strfieldcpy(udev->group, perm->group);
 630         } else {
 631                 /* no matching perms found :( */
 632                 udev->mode = get_default_mode(class_dev);
 633                 udev->owner[0] = 0x00;
 634                 udev->group[0] = 0x00;
 635         }
 636         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 637             udev->name, udev->owner, udev->group, udev->mode);
 638
 639         if (class_dev_parent)
 640                 sysfs_close_class_device(class_dev_parent);
 641
 642         return 0;
 643 }
 644
 645 int namedev_init(void)
 646 {
 647         int retval;
 648
 649         retval = namedev_init_rules();
 650         if (retval)
 651                 return retval;
 652
 653         retval = namedev_init_permissions();
 654         if (retval)
 655                 return retval;
 656
 657         dump_config_dev_list();
 658         dump_perm_dev_list();
 659         return retval;
 660 }