namedev_parse.c

   1 /*
   2  * namedev_parse.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 /* define this to enable parsing debugging */
  25 /* #define DEBUG_PARSER */
  26
  27 #include <stddef.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <fcntl.h>
  32 #include <ctype.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35
  36 #include "udev.h"
  37 #include "namedev.h"
  38
  39 int get_pair(char **orig_string, char **left, char **right)
  40 {
  41         char *temp;
  42         char *string = *orig_string;
  43
  44         if (!string)
  45                 return -ENODEV;
  46
  47         /* eat any whitespace */
  48         while (isspace(*string))
  49                 ++string;
  50
  51         /* split based on '=' */
  52         temp = strsep(&string, "=");
  53         *left = temp;
  54         if (!string)
  55                 return -ENODEV;
  56
  57         /* take the right side and strip off the '"' */
  58         while (isspace(*string))
  59                 ++string;
  60         if (*string == '"')
  61                 ++string;
  62         else
  63                 return -ENODEV;
  64
  65         temp = strsep(&string, "\"");
  66         if (!string || *temp == '\0')
  67                 return -ENODEV;
  68         *right = temp;
  69         *orig_string = string;
  70
  71         return 0;
  72 }
  73
  74 static int get_value(const char *left, char **orig_string, char **ret_string)
  75 {
  76         int retval;
  77         char *left_string;
  78
  79         retval = get_pair(orig_string, &left_string, ret_string);
  80         if (retval)
  81                 return retval;
  82         if (strcasecmp(left_string, left) != 0)
  83                 return -ENODEV;
  84         return 0;
  85 }
  86
  87 void dump_config_dev(struct config_device *dev)
  88 {
  89         switch (dev->type) {
  90         case KERNEL_NAME:
  91                 dbg_parse("KERNEL name='%s'", dev->name);
  92                 break;
  93         case LABEL:
  94                 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s'",
  95                           dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value);
  96                 break;
  97         case NUMBER:
  98                 dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
  99                           dev->name, dev->bus, dev->id);
 100                 break;
 101         case TOPOLOGY:
 102                 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 103                           dev->name, dev->bus, dev->place);
 104                 break;
 105         case REPLACE:
 106                 dbg_parse("REPLACE name=%s, kernel_name=%s",
 107                           dev->name, dev->kernel_name);
 108                 break;
 109         case CALLOUT:
 110                 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s'",
 111                           dev->name, dev->bus, dev->exec_program, dev->id);
 112                 break;
 113         default:
 114                 dbg_parse("unknown type of method");
 115         }
 116 }
 117
 118 void dump_config_dev_list(void)
 119 {
 120         struct list_head *tmp;
 121
 122         list_for_each(tmp, &config_device_list) {
 123                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 124                 dump_config_dev(dev);
 125         }
 126 }
 127
 128 void dump_perm_dev(struct perm_device *dev)
 129 {
 130         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 131                   dev->name, dev->owner, dev->group, dev->mode);
 132 }
 133
 134 void dump_perm_dev_list(void)
 135 {
 136         struct list_head *tmp;
 137
 138         list_for_each(tmp, &perm_device_list) {
 139                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 140                 dump_perm_dev(dev);
 141         }
 142 }
 143
 144
 145 int namedev_init_rules(void)
 146 {
 147         char line[255];
 148         int lineno;
 149         char *temp;
 150         char *temp2;
 151         char *temp3;
 152         FILE *fd;
 153         int retval = 0;
 154         struct config_device dev;
 155
 156         fd = fopen(udev_rules_filename, "r");
 157         if (fd != NULL) {
 158                 dbg("reading '%s' as rules file", udev_rules_filename);
 159         } else {
 160                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 161                 return -ENODEV;
 162         }
 163
 164         /* loop through the whole file */
 165         lineno = 0;
 166         while (1) {
 167                 /* get a line */
 168                 temp = fgets(line, sizeof(line), fd);
 169                 if (temp == NULL)
 170                         goto exit;
 171                 lineno++;
 172
 173                 dbg_parse("read '%s'", temp);
 174
 175                 /* eat the whitespace at the beginning of the line */
 176                 while (isspace(*temp))
 177                         ++temp;
 178
 179                 /* empty line? */
 180                 if (*temp == 0x00)
 181                         continue;
 182
 183                 /* see if this is a comment */
 184                 if (*temp == COMMENT_CHARACTER)
 185                         continue;
 186
 187                 memset(&dev, 0x00, sizeof(struct config_device));
 188
 189                 /* parse the line */
 190                 temp2 = strsep(&temp, ",");
 191                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 192                         /* label type */
 193                         dev.type = LABEL;
 194
 195                         /* BUS="bus" */
 196                         retval = get_value("BUS", &temp, &temp3);
 197                         if (retval)
 198                                 break;
 199                         strfieldcpy(dev.bus, temp3);
 200
 201                         /* file="value" */
 202                         temp2 = strsep(&temp, ",");
 203                         retval = get_pair(&temp, &temp2, &temp3);
 204                         if (retval)
 205                                 break;
 206                         strfieldcpy(dev.sysfs_file, temp2);
 207                         strfieldcpy(dev.sysfs_value, temp3);
 208
 209                         /* NAME="new_name" */
 210                         temp2 = strsep(&temp, ",");
 211                         retval = get_value("NAME", &temp, &temp3);
 212                         if (retval)
 213                                 break;
 214                         strfieldcpy(dev.name, temp3);
 215
 216                         /* SYMLINK="name" */
 217                         temp2 = strsep(&temp, ",");
 218                         retval = get_value("SYMLINK", &temp, &temp3);
 219                         if (retval == 0)
 220                                 strfieldcpy(dev.symlink, temp3);
 221
 222                         dbg_parse("LABEL name='%s', bus='%s', "
 223                                   "sysfs_file='%s', sysfs_value='%s', symlink='%s'",
 224                                   dev.name, dev.bus, dev.sysfs_file,
 225                                   dev.sysfs_value, dev.symlink);
 226                 }
 227
 228                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 229                         /* number type */
 230                         dev.type = NUMBER;
 231
 232                         /* BUS="bus" */
 233                         retval = get_value("BUS", &temp, &temp3);
 234                         if (retval)
 235                                 break;
 236                         strfieldcpy(dev.bus, temp3);
 237
 238                         /* ID="id" */
 239                         temp2 = strsep(&temp, ",");
 240                         retval = get_value("ID", &temp, &temp3);
 241                         if (retval)
 242                                 break;
 243                         strfieldcpy(dev.id, temp3);
 244
 245                         /* NAME="new_name" */
 246                         temp2 = strsep(&temp, ",");
 247                         retval = get_value("NAME", &temp, &temp3);
 248                         if (retval)
 249                                 break;
 250                         strfieldcpy(dev.name, temp3);
 251
 252                         /* SYMLINK="name" */
 253                         temp2 = strsep(&temp, ",");
 254                         retval = get_value("SYMLINK", &temp, &temp3);
 255                         if (retval == 0)
 256                                 strfieldcpy(dev.symlink, temp3);
 257
 258                         dbg_parse("NUMBER name='%s', bus='%s', id='%s', symlink='%s'",
 259                                   dev.name, dev.bus, dev.id, dev.symlink);
 260                 }
 261
 262                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 263                         /* number type */
 264                         dev.type = TOPOLOGY;
 265
 266                         /* BUS="bus" */
 267                         retval = get_value("BUS", &temp, &temp3);
 268                         if (retval)
 269                                 break;
 270                         strfieldcpy(dev.bus, temp3);
 271
 272                         /* PLACE="place" */
 273                         temp2 = strsep(&temp, ",");
 274                         retval = get_value("PLACE", &temp, &temp3);
 275                         if (retval)
 276                                 break;
 277                         strfieldcpy(dev.place, temp3);
 278
 279                         /* NAME="new_name" */
 280                         temp2 = strsep(&temp, ",");
 281                         retval = get_value("NAME", &temp, &temp3);
 282                         if (retval)
 283                                 break;
 284                         strfieldcpy(dev.name, temp3);
 285
 286                         /* SYMLINK="name" */
 287                         temp2 = strsep(&temp, ",");
 288                         retval = get_value("SYMLINK", &temp, &temp3);
 289                         if (retval == 0)
 290                                 strfieldcpy(dev.symlink, temp3);
 291
 292                         dbg_parse("TOPOLOGY name='%s', bus='%s', "
 293                                   "place='%s', symlink='%s'",
 294                                   dev.name, dev.bus, dev.place, dev.symlink);
 295                 }
 296
 297                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 298                         /* number type */
 299                         dev.type = REPLACE;
 300
 301                         /* KERNEL="kernel_name" */
 302                         retval = get_value("KERNEL", &temp, &temp3);
 303                         if (retval)
 304                                 break;
 305                         strfieldcpy(dev.kernel_name, temp3);
 306
 307                         /* NAME="new_name" */
 308                         temp2 = strsep(&temp, ",");
 309                         retval = get_value("NAME", &temp, &temp3);
 310                         if (retval)
 311                                 break;
 312                         strfieldcpy(dev.name, temp3);
 313
 314                         /* SYMLINK="name" */
 315                         temp2 = strsep(&temp, ",");
 316                         retval = get_value("SYMLINK", &temp, &temp3);
 317                         if (retval == 0)
 318                                 strfieldcpy(dev.symlink, temp3);
 319
 320                         dbg_parse("REPLACE name='%s', kernel_name='%s', symlink='%s'",
 321                                   dev.name, dev.kernel_name, dev.symlink);
 322                 }
 323
 324                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 325                         /* number type */
 326                         dev.type = CALLOUT;
 327
 328                         /* BUS="bus" */
 329                         retval = get_value("BUS", &temp, &temp3);
 330                         if (retval)
 331                                 break;
 332                         strfieldcpy(dev.bus, temp3);
 333
 334                         /* PROGRAM="executable" */
 335                         temp2 = strsep(&temp, ",");
 336                         retval = get_value("PROGRAM", &temp, &temp3);
 337                         if (retval)
 338                                 break;
 339                         strfieldcpy(dev.exec_program, temp3);
 340
 341                         /* ID="id" */
 342                         temp2 = strsep(&temp, ",");
 343                         retval = get_value("ID", &temp, &temp3);
 344                         if (retval)
 345                                 break;
 346                         strfieldcpy(dev.id, temp3);
 347
 348                         /* NAME="new_name" */
 349                         temp2 = strsep(&temp, ",");
 350                         retval = get_value("NAME", &temp, &temp3);
 351                         if (retval)
 352                                 break;
 353                         strfieldcpy(dev.name, temp3);
 354
 355                         /* SYMLINK="name" */
 356                         temp2 = strsep(&temp, ",");
 357                         retval = get_value("SYMLINK", &temp, &temp3);
 358                         if (retval == 0)
 359                                 strfieldcpy(dev.symlink, temp3);
 360
 361                         dbg_parse("CALLOUT name='%s', bus='%s', program='%s', "
 362                                   "id='%s', symlink='%s'",
 363                                   dev.name, dev.bus, dev.exec_program,
 364                                   dev.id, dev.symlink);
 365                 }
 366
 367                 retval = add_config_dev(&dev);
 368                 if (retval) {
 369                         dbg("add_config_dev returned with error %d", retval);
 370                         goto exit;
 371                 }
 372         }
 373         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_rules_filename,
 374                   lineno, temp - line, temp);
 375 exit:
 376         fclose(fd);
 377         return retval;
 378 }
 379
 380
 381 int namedev_init_permissions(void)
 382 {
 383         char line[255];
 384         char *temp;
 385         char *temp2;
 386         FILE *fd;
 387         int retval = 0;
 388         struct perm_device dev;
 389
 390         fd = fopen(udev_permissions_filename, "r");
 391         if (fd != NULL) {
 392                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 393         } else {
 394                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 395                 return -ENODEV;
 396         }
 397
 398         /* loop through the whole file */
 399         while (1) {
 400                 temp = fgets(line, sizeof(line), fd);
 401                 if (temp == NULL)
 402                         break;
 403
 404                 dbg_parse("read '%s'", temp);
 405
 406                 /* eat the whitespace at the beginning of the line */
 407                 while (isspace(*temp))
 408                         ++temp;
 409
 410                 /* empty line? */
 411                 if (*temp == 0x00)
 412                         continue;
 413
 414                 /* see if this is a comment */
 415                 if (*temp == COMMENT_CHARACTER)
 416                         continue;
 417
 418                 memset(&dev, 0x00, sizeof(dev));
 419
 420                 /* parse the line */
 421                 temp2 = strsep(&temp, ":");
 422                 if (!temp2) {
 423                         dbg("cannot parse line '%s'", line);
 424                         continue;
 425                 }
 426                 strncpy(dev.name, temp2, sizeof(dev.name));
 427
 428                 temp2 = strsep(&temp, ":");
 429                 if (!temp2) {
 430                         dbg("cannot parse line '%s'", line);
 431                         continue;
 432                 }
 433                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 434
 435                 temp2 = strsep(&temp, ":");
 436                 if (!temp2) {
 437                         dbg("cannot parse line '%s'", line);
 438                         continue;
 439                 }
 440                 strncpy(dev.group, temp2, sizeof(dev.owner));
 441
 442                 if (!temp) {
 443                         dbg("cannot parse line: %s", line);
 444                         continue;
 445                 }
 446                 dev.mode = strtol(temp, NULL, 8);
 447
 448                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 449                           dev.name, dev.owner, dev.group,
 450                           dev.mode);
 451                 retval = add_perm_dev(&dev);
 452                 if (retval) {
 453                         dbg("add_perm_dev returned with error %d", retval);
 454                         goto exit;
 455                 }
 456         }
 457
 458 exit:
 459         fclose(fd);
 460         return retval;
 461 }
 462
 463