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
  33 #include "list.h"
  34 #include "udev.h"
  35 #include "udev_version.h"
  36 #include "namedev.h"
  37 #include "libsysfs/libsysfs.h"
  38
  39 #define TYPE_LABEL      "LABEL"
  40 #define TYPE_NUMBER     "NUMBER"
  41 #define TYPE_TOPOLOGY   "TOPOLOGY"
  42 #define TYPE_REPLACE    "REPLACE"
  43
  44 static LIST_HEAD(config_device_list);
  45
  46 static void dump_dev(struct config_device *dev)
  47 {
  48         switch (dev->type) {
  49         case KERNEL_NAME:
  50                 dbg("KERNEL name ='%s'"
  51                         " owner = '%s', group = '%s', mode = '%#o'",
  52                         dev->attr.name,
  53                         dev->attr.owner, dev->attr.group, dev->attr.mode);
  54                 break;
  55         case LABEL:
  56                 dbg("LABEL name = '%s', bus = '%s', sysfs_file = '%s', sysfs_value = '%s'"
  57                         " owner = '%s', group = '%s', mode = '%#o'",
  58                         dev->attr.name, dev->bus, dev->sysfs_file, dev->sysfs_value,
  59                         dev->attr.owner, dev->attr.group, dev->attr.mode);
  60                 break;
  61         case NUMBER:
  62                 dbg("NUMBER name = '%s', bus = '%s', id = '%s'"
  63                         " owner = '%s', group = '%s', mode = '%#o'",
  64                         dev->attr.name, dev->bus, dev->id,
  65                         dev->attr.owner, dev->attr.group, dev->attr.mode);
  66                 break;
  67         case TOPOLOGY:
  68                 dbg("TOPOLOGY name = '%s', bus = '%s', place = '%s'"
  69                         " owner = '%s', group = '%s', mode = '%#o'",
  70                         dev->attr.name, dev->bus, dev->place,
  71                         dev->attr.owner, dev->attr.group, dev->attr.mode);
  72                 break;
  73         case REPLACE:
  74                 dbg("REPLACE name = %s, kernel_name = %s"
  75                         " owner = '%s', group = '%s', mode = '%#o'",
  76                         dev->attr.name, dev->kernel_name,
  77                         dev->attr.owner, dev->attr.group, dev->attr.mode);
  78                 break;
  79         default:
  80                 dbg("Unknown type of device!");
  81         }
  82 }
  83
  84 #define copy_var(a, b, var)             \
  85         if (b->var)                     \
  86                 a->var = b->var;
  87
  88 #define copy_string(a, b, var)          \
  89         if (strlen(b->var))             \
  90                 strcpy(a->var, b->var);
  91
  92 static int add_dev(struct config_device *new_dev)
  93 {
  94         struct list_head *tmp;
  95         struct config_device *tmp_dev;
  96
  97         /* loop through the whole list of devices to see if we already have
  98          * this one... */
  99         list_for_each(tmp, &config_device_list) {
 100                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 101                 if (strcmp(dev->attr.name, new_dev->attr.name) == 0) {
 102                         /* the same, copy the new info into this structure */
 103                         copy_var(dev, new_dev, type);
 104                         copy_var(dev, new_dev, attr.mode);
 105                         copy_string(dev, new_dev, bus);
 106                         copy_string(dev, new_dev, sysfs_file);
 107                         copy_string(dev, new_dev, sysfs_value);
 108                         copy_string(dev, new_dev, id);
 109                         copy_string(dev, new_dev, place);
 110                         copy_string(dev, new_dev, kernel_name);
 111                         copy_string(dev, new_dev, attr.owner);
 112                         copy_string(dev, new_dev, attr.group);
 113                         return 0;
 114                 }
 115         }
 116
 117         /* not found, lets create a new structure, and add it to the list */
 118         tmp_dev = malloc(sizeof(*tmp_dev));
 119         if (!tmp_dev)
 120                 return -ENOMEM;
 121         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 122         list_add(&tmp_dev->node, &config_device_list);
 123         //dump_dev(tmp_dev);
 124         return 0;
 125 }
 126
 127 static void dump_dev_list(void)
 128 {
 129         struct list_head *tmp;
 130
 131         list_for_each(tmp, &config_device_list) {
 132                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 133                 dump_dev(dev);
 134         }
 135 }
 136
 137 static int get_value(const char *left, char **orig_string, char **ret_string)
 138 {
 139         char *temp;
 140         char *string = *orig_string;
 141
 142         /* eat any whitespace */
 143         while (isspace(*string))
 144                 ++string;
 145
 146         /* split based on '=' */
 147         temp = strsep(&string, "=");
 148         if (strcasecmp(temp, left) == 0) {
 149                 /* got it, now strip off the '"' */
 150                 while (isspace(*string))
 151                         ++string;
 152                 if (*string == '"')
 153                         ++string;
 154                 temp = strsep(&string, "\"");
 155                 *ret_string = temp;
 156                 *orig_string = string;
 157                 return 0;
 158         }
 159         return -ENODEV;
 160 }
 161
 162 static int get_pair(char **orig_string, char **left, char **right)
 163 {
 164         char *temp;
 165         char *string = *orig_string;
 166
 167         /* eat any whitespace */
 168         while (isspace(*string))
 169                 ++string;
 170
 171         /* split based on '=' */
 172         temp = strsep(&string, "=");
 173         *left = temp;
 174
 175         /* take the right side and strip off the '"' */
 176         while (isspace(*string))
 177                 ++string;
 178         if (*string == '"')
 179                 ++string;
 180         temp = strsep(&string, "\"");
 181         *right = temp;
 182         *orig_string = string;
 183
 184         return 0;
 185 }
 186
 187 static int namedev_init_config(void)
 188 {
 189         char filename[255];
 190         char line[255];
 191         char *temp;
 192         char *temp2;
 193         char *temp3;
 194         FILE *fd;
 195         int retval = 0;
 196         struct config_device dev;
 197
 198         strcpy(filename, NAMEDEV_CONFIG_ROOT NAMEDEV_CONFIG_FILE);
 199         dbg("opening %s to read as permissions config", filename);
 200         fd = fopen(filename, "r");
 201         if (fd == NULL) {
 202                 dbg("Can't open %s", filename);
 203                 return -ENODEV;
 204         }
 205
 206         /* loop through the whole file */
 207         while (1) {
 208                 /* get a line */
 209                 temp = fgets(line, sizeof(line), fd);
 210                 if (temp == NULL)
 211                         break;
 212
 213                 dbg("read %s", temp);
 214
 215                 /* eat the whitespace at the beginning of the line */
 216                 while (isspace(*temp))
 217                         ++temp;
 218
 219                 /* no more line? */
 220                 if (*temp == 0x00)
 221                         continue;
 222
 223                 /* see if this is a comment */
 224                 if (*temp == COMMENT_CHARACTER)
 225                         continue;
 226
 227                 memset(&dev, 0x00, sizeof(struct config_device));
 228
 229                 /* parse the line */
 230                 temp2 = strsep(&temp, ",");
 231                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 232                         /* label type */
 233                         dev.type = LABEL;
 234
 235                         /* BUS="bus" */
 236                         retval = get_value("BUS", &temp, &temp3);
 237                         if (retval)
 238                                 continue;
 239                         strcpy(dev.bus, temp3);
 240
 241                         /* file="value" */
 242                         temp2 = strsep(&temp, ",");
 243                         retval = get_pair(&temp, &temp2, &temp3);
 244                         if (retval)
 245                                 continue;
 246                         strcpy(dev.sysfs_file, temp2);
 247                         strcpy(dev.sysfs_value, temp3);
 248
 249                         /* NAME="new_name" */
 250                         temp2 = strsep(&temp, ",");
 251                         retval = get_value("NAME", &temp, &temp3);
 252                         if (retval)
 253                                 continue;
 254                         strcpy(dev.attr.name, temp3);
 255
 256                         dbg("LABEL name = '%s', bus = '%s', sysfs_file = '%s', sysfs_value = '%s'", dev.attr.name, dev.bus, dev.sysfs_file, dev.sysfs_value);
 257                 }
 258
 259                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 260                         /* number type */
 261                         dev.type = NUMBER;
 262
 263                         /* BUS="bus" */
 264                         retval = get_value("BUS", &temp, &temp3);
 265                         if (retval)
 266                                 continue;
 267                         strcpy(dev.bus, temp3);
 268
 269                         /* ID="id" */
 270                         temp2 = strsep(&temp, ",");
 271                         retval = get_value("id", &temp, &temp3);
 272                         if (retval)
 273                                 continue;
 274                         strcpy(dev.id, temp3);
 275
 276                         /* NAME="new_name" */
 277                         temp2 = strsep(&temp, ",");
 278                         retval = get_value("NAME", &temp, &temp3);
 279                         if (retval)
 280                                 continue;
 281                         strcpy(dev.attr.name, temp3);
 282
 283                         dbg("NUMBER name = '%s', bus = '%s', id = '%s'", dev.attr.name, dev.bus, dev.id);
 284                 }
 285
 286                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 287                         /* number type */
 288                         dev.type = TOPOLOGY;
 289
 290                         /* BUS="bus" */
 291                         retval = get_value("BUS", &temp, &temp3);
 292                         if (retval)
 293                                 continue;
 294                         strcpy(dev.bus, temp3);
 295
 296                         /* PLACE="place" */
 297                         temp2 = strsep(&temp, ",");
 298                         retval = get_value("place", &temp, &temp3);
 299                         if (retval)
 300                                 continue;
 301                         strcpy(dev.place, temp3);
 302
 303                         /* NAME="new_name" */
 304                         temp2 = strsep(&temp, ",");
 305                         retval = get_value("NAME", &temp, &temp3);
 306                         if (retval)
 307                                 continue;
 308                         strcpy(dev.attr.name, temp3);
 309
 310                         dbg("TOPOLOGY name = '%s', bus = '%s', place = '%s'", dev.attr.name, dev.bus, dev.place);
 311                 }
 312
 313                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 314                         /* number type */
 315                         dev.type = REPLACE;
 316
 317                         /* KERNEL="kernel_name" */
 318                         retval = get_value("KERNEL", &temp, &temp3);
 319                         if (retval)
 320                                 continue;
 321                         strcpy(dev.kernel_name, temp3);
 322
 323                         /* NAME="new_name" */
 324                         temp2 = strsep(&temp, ",");
 325                         retval = get_value("NAME", &temp, &temp3);
 326                         if (retval)
 327                                 continue;
 328                         strcpy(dev.attr.name, temp3);
 329                         dbg("REPLACE name = %s, kernel_name = %s", dev.attr.name, dev.kernel_name);
 330                 }
 331
 332                 retval = add_dev(&dev);
 333                 if (retval) {
 334                         dbg("add_dev returned with error %d", retval);
 335                         goto exit;
 336                 }
 337         }
 338
 339 exit:
 340         fclose(fd);
 341         return retval;
 342 }
 343
 344
 345 static int namedev_init_permissions(void)
 346 {
 347         char filename[255];
 348         char line[255];
 349         char *temp;
 350         char *temp2;
 351         FILE *fd;
 352         int retval = 0;
 353         struct config_device dev;
 354
 355         strcpy(filename, NAMEDEV_CONFIG_ROOT NAMEDEV_CONFIG_PERMISSION_FILE);
 356         dbg("opening %s to read as permissions config", filename);
 357         fd = fopen(filename, "r");
 358         if (fd == NULL) {
 359                 dbg("Can't open %s", filename);
 360                 return -ENODEV;
 361         }
 362
 363         /* loop through the whole file */
 364         while (1) {
 365                 /* get a line */
 366                 temp = fgets(line, sizeof(line), fd);
 367                 if (temp == NULL)
 368                         break;
 369
 370                 dbg("read %s", temp);
 371
 372                 /* eat the whitespace at the beginning of the line */
 373                 while (isspace(*temp))
 374                         ++temp;
 375
 376                 /* no more line? */
 377                 if (*temp == 0x00)
 378                         continue;
 379
 380                 /* see if this is a comment */
 381                 if (*temp == COMMENT_CHARACTER)
 382                         continue;
 383
 384                 memset(&dev, 0x00, sizeof(dev));
 385
 386                 /* parse the line */
 387                 temp2 = strsep(&temp, ":");
 388                 strncpy(dev.attr.name, temp2, sizeof(dev.attr.name));
 389
 390                 temp2 = strsep(&temp, ":");
 391                 strncpy(dev.attr.owner, temp2, sizeof(dev.attr.owner));
 392
 393                 temp2 = strsep(&temp, ":");
 394                 strncpy(dev.attr.group, temp2, sizeof(dev.attr.owner));
 395
 396                 dev.attr.mode = strtol(temp, NULL, 8);
 397
 398                 dbg("name = %s, owner = %s, group = %s, mode = %#o", dev.attr.name, dev.attr.owner, dev.attr.group, dev.attr.mode);
 399                 retval = add_dev(&dev);
 400                 if (retval) {
 401                         dbg("add_dev returned with error %d", retval);
 402                         goto exit;
 403                 }
 404         }
 405
 406 exit:
 407         fclose(fd);
 408         return retval;
 409 }
 410
 411 static int get_default_mode(struct sysfs_class_device *class_dev)
 412 {
 413         /* just default everyone to rw for the world! */
 414         return 0666;
 415 }
 416
 417
 418 static int get_attr(struct sysfs_class_device *class_dev, struct device_attr *attr)
 419 {
 420         struct list_head *tmp;
 421         int retval = 0;
 422         int found;
 423
 424         list_for_each(tmp, &config_device_list) {
 425                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 426                 switch (dev->type) {
 427                 case LABEL:
 428                         dbg("LABEL name = '%s', bus = '%s', sysfs_file = '%s', sysfs_value = '%s'"
 429                                 " owner = '%s', group = '%s', mode = '%#o'",
 430                                 dev->attr.name, dev->bus, dev->sysfs_file, dev->sysfs_value,
 431                                 dev->attr.owner, dev->attr.group, dev->attr.mode);
 432                         break;
 433                 case NUMBER:
 434                         dbg("NUMBER name = '%s', bus = '%s', id = '%s'"
 435                                 " owner = '%s', group = '%s', mode = '%#o'",
 436                                 dev->attr.name, dev->bus, dev->id,
 437                                 dev->attr.owner, dev->attr.group, dev->attr.mode);
 438                         break;
 439                 case TOPOLOGY:
 440                         dbg("TOPOLOGY name = '%s', bus = '%s', place = '%s'"
 441                                 " owner = '%s', group = '%s', mode = '%#o'",
 442                                 dev->attr.name, dev->bus, dev->place,
 443                                 dev->attr.owner, dev->attr.group, dev->attr.mode);
 444                         break;
 445                 case REPLACE:
 446                         if (strcmp(dev->kernel_name, class_dev->name) != 0)
 447                                 continue;
 448                         strcpy(attr->name, dev->attr.name);
 449                         attr->mode = dev->attr.mode;
 450                         strcpy(attr->owner, dev->attr.owner);
 451                         strcpy(attr->group, dev->attr.group);
 452                         dbg("'%s' becomes '%s' - owner = %s, group = %s, mode = %#o",
 453                                 dev->kernel_name, attr->name,
 454                                 dev->attr.owner, dev->attr.group, dev->attr.mode);
 455                         return retval;
 456                         break;
 457                 default:
 458                         dbg("Unknown type of device!");
 459                         break;
 460                 }
 461         }
 462         attr->mode = get_default_mode(class_dev);
 463         attr->owner[0] = 0x00;
 464         attr->group[0] = 0x00;
 465         strcpy(attr->name, class_dev->name);
 466 exit:
 467         return retval;
 468 }
 469
 470 int namedev_name_device(struct sysfs_class_device *class_dev, struct device_attr *attr)
 471 {
 472         int retval;
 473
 474         retval = get_attr(class_dev, attr);
 475         if (retval)
 476                 dbg("get_attr failed");
 477
 478         return retval;
 479 }
 480
 481 int namedev_init(void)
 482 {
 483         int retval;
 484
 485         retval = namedev_init_config();
 486         if (retval)
 487                 return retval;
 488
 489         retval = namedev_init_permissions();
 490         if (retval)
 491                 return retval;
 492
 493         dump_dev_list();
 494         return retval;
 495 }
 496
 497