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 static int add_config_dev(struct config_device *new_dev)
  40 {
  41         struct config_device *tmp_dev;
  42
  43         tmp_dev = malloc(sizeof(*tmp_dev));
  44         if (tmp_dev == NULL)
  45                 return -ENOMEM;
  46         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  47         list_add_tail(&tmp_dev->node, &config_device_list);
  48         //dump_config_dev(tmp_dev);
  49         return 0;
  50 }
  51
  52 int get_pair(char **orig_string, char **left, char **right)
  53 {
  54         char *temp;
  55         char *string = *orig_string;
  56
  57         if (!string)
  58                 return -ENODEV;
  59
  60         /* eat any whitespace */
  61         while (isspace(*string) || *string == ',')
  62                 ++string;
  63
  64         /* split based on '=' */
  65         temp = strsep(&string, "=");
  66         *left = temp;
  67         if (!string)
  68                 return -ENODEV;
  69
  70         /* take the right side and strip off the '"' */
  71         while (isspace(*string))
  72                 ++string;
  73         if (*string == '"')
  74                 ++string;
  75         else
  76                 return -ENODEV;
  77
  78         temp = strsep(&string, "\"");
  79         if (!string || *temp == '\0')
  80                 return -ENODEV;
  81         *right = temp;
  82         *orig_string = string;
  83
  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[0]='%s', sysfs_value[0]='%s'",
  95                           dev->name, dev->bus, dev->sysfs_pair[0].file, dev->sysfs_pair[0].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         case IGNORE:
 114                 dbg_parse("IGNORE name='%s', kernel_name='%s'",
 115                           dev->name, dev->kernel_name);
 116                 break;
 117         default:
 118                 dbg_parse("unknown type of method");
 119         }
 120 }
 121
 122 void dump_config_dev_list(void)
 123 {
 124         struct config_device *dev;
 125
 126         list_for_each_entry(dev, &config_device_list, node)
 127                 dump_config_dev(dev);
 128 }
 129
 130 void dump_perm_dev(struct perm_device *dev)
 131 {
 132         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 133                   dev->name, dev->owner, dev->group, dev->mode);
 134 }
 135
 136 void dump_perm_dev_list(void)
 137 {
 138         struct perm_device *dev;
 139
 140         list_for_each_entry(dev, &perm_device_list, node)
 141                 dump_perm_dev(dev);
 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                 dbg_parse("read '%s'", temp);
 173
 174                 /* eat the whitespace */
 175                 while (isspace(*temp))
 176                         ++temp;
 177
 178                 /* empty line? */
 179                 if ((*temp == '\0') || (*temp == '\n'))
 180                         continue;
 181
 182                 /* see if this is a comment */
 183                 if (*temp == COMMENT_CHARACTER)
 184                         continue;
 185
 186                 memset(&dev, 0x00, sizeof(struct config_device));
 187
 188                 /* get the method */
 189                 temp2 = strsep(&temp, ",");
 190
 191                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 192                         dev.type = LABEL;
 193                         goto keys;
 194                 }
 195
 196                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 197                         dev.type = NUMBER;
 198                         goto keys;
 199                 }
 200
 201                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 202                         dev.type = TOPOLOGY;
 203                         goto keys;
 204                 }
 205
 206                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 207                         dev.type = REPLACE;
 208                         goto keys;
 209                 }
 210
 211                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 212                         dev.type = CALLOUT;
 213                         goto keys;
 214                 }
 215
 216                 if (strcasecmp(temp2, TYPE_IGNORE) == 0) {
 217                         dev.type = IGNORE;
 218                         goto keys;
 219                 }
 220
 221                 dbg_parse("unknown type of method '%s'", temp2);
 222                 goto error;
 223 keys:
 224                 /* get all known keys */
 225                 while (1) {
 226                         retval = get_pair(&temp, &temp2, &temp3);
 227                         if (retval)
 228                                 break;
 229
 230                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 231                                 strfieldcpy(dev.bus, temp3);
 232                                 continue;
 233                         }
 234
 235                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 236                                 strfieldcpy(dev.id, temp3);
 237                                 continue;
 238                         }
 239
 240                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 241                                 strfieldcpy(dev.place, temp3);
 242                                 continue;
 243                         }
 244
 245                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 246                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 247                                 int sysfs_pair_num = 0;
 248
 249                                 /* find first unused pair */
 250                                 while (pair->file[0] != '\0') {
 251                                         ++sysfs_pair_num;
 252                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 253                                                 pair = NULL;
 254                                                 break;
 255                                         }
 256                                         ++pair;
 257                                 }
 258                                 if (pair) {
 259                                         /* remove prepended 'SYSFS_' */
 260                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 261                                         strfieldcpy(pair->value, temp3);
 262                                 }
 263                                 continue;
 264                         }
 265
 266                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 267                                 strfieldcpy(dev.kernel_name, temp3);
 268                                 continue;
 269                         }
 270
 271                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 272                                 strfieldcpy(dev.exec_program, temp3);
 273                                 continue;
 274                         }
 275
 276                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 277                                 strfieldcpy(dev.name, temp3);
 278                                 continue;
 279                         }
 280
 281                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 282                                 strfieldcpy(dev.symlink, temp3);
 283                                 continue;
 284                         }
 285
 286                         dbg_parse("unknown type of field '%s'", temp2);
 287                 }
 288
 289                 /* check presence of keys according to method type */
 290                 switch (dev.type) {
 291                 case LABEL:
 292                         dbg_parse(TYPE_LABEL " name='%s', bus='%s', "
 293                                   "sysfs_file[0]='%s', sysfs_value[0]='%s', symlink='%s'",
 294                                   dev.name, dev.bus, dev.sysfs_pair[0].file,
 295                                   dev.sysfs_pair[0].value, dev.symlink);
 296                         if ((*dev.name == '\0') ||
 297                             (*dev.sysfs_pair[0].file == '\0') ||
 298                             (*dev.sysfs_pair[0].value == '\0'))
 299                                 goto error;
 300                         break;
 301                 case NUMBER:
 302                         dbg_parse(TYPE_NUMBER " name='%s', bus='%s', id='%s', symlink='%s'",
 303                                   dev.name, dev.bus, dev.id, dev.symlink);
 304                         if ((*dev.name == '\0') ||
 305                             (*dev.bus == '\0') ||
 306                             (*dev.id == '\0'))
 307                                 goto error;
 308                         break;
 309                 case TOPOLOGY:
 310                         dbg_parse(TYPE_TOPOLOGY " name='%s', bus='%s', "
 311                                   "place='%s', symlink='%s'",
 312                                   dev.name, dev.bus, dev.place, dev.symlink);
 313                         if ((*dev.name == '\0') ||
 314                             (*dev.bus == '\0') ||
 315                             (*dev.place == '\0'))
 316                                 goto error;
 317                         break;
 318                 case REPLACE:
 319                         dbg_parse(TYPE_REPLACE " name='%s', kernel_name='%s', symlink='%s'",
 320                                   dev.name, dev.kernel_name, dev.symlink);
 321                         if ((*dev.name == '\0') ||
 322                             (*dev.kernel_name == '\0'))
 323                                 goto error;
 324                         break;
 325                 case CALLOUT:
 326                         dbg_parse(TYPE_CALLOUT " name='%s', bus='%s', program='%s', "
 327                                   "id='%s', symlink='%s'",
 328                                   dev.name, dev.bus, dev.exec_program,
 329                                   dev.id, dev.symlink);
 330                         if ((*dev.name == '\0') ||
 331                             (*dev.id == '\0') ||
 332                             (*dev.exec_program == '\0'))
 333                                 goto error;
 334                         break;
 335                 case IGNORE:
 336                         dbg_parse(TYPE_IGNORE "name='%s', kernel_name='%s'",
 337                                   dev.name, dev.kernel_name);
 338                         if ((*dev.kernel_name == '\0'))
 339                                 goto error;
 340                         break;
 341                 default:
 342                         dbg_parse("unknown type of method");
 343                         goto error;
 344                 }
 345
 346                 retval = add_config_dev(&dev);
 347                 if (retval) {
 348                         dbg("add_config_dev returned with error %d", retval);
 349                         continue;
 350                 }
 351         }
 352 error:
 353         dbg_parse("%s:%d:%Zd: field missing or parse error", udev_rules_filename,
 354                   lineno, temp - line);
 355 exit:
 356         fclose(fd);
 357         return retval;
 358 }
 359
 360 int namedev_init_permissions(void)
 361 {
 362         char line[255];
 363         char *temp;
 364         char *temp2;
 365         FILE *fd;
 366         int retval = 0;
 367         struct perm_device dev;
 368
 369         fd = fopen(udev_permissions_filename, "r");
 370         if (fd != NULL) {
 371                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 372         } else {
 373                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 374                 return -ENODEV;
 375         }
 376
 377         /* loop through the whole file */
 378         while (1) {
 379                 temp = fgets(line, sizeof(line), fd);
 380                 if (temp == NULL)
 381                         break;
 382
 383                 dbg_parse("read '%s'", temp);
 384
 385                 /* eat the whitespace at the beginning of the line */
 386                 while (isspace(*temp))
 387                         ++temp;
 388
 389                 /* empty line? */
 390                 if ((*temp == '\0') || (*temp == '\n'))
 391                         continue;
 392
 393                 /* see if this is a comment */
 394                 if (*temp == COMMENT_CHARACTER)
 395                         continue;
 396
 397                 memset(&dev, 0x00, sizeof(dev));
 398
 399                 /* parse the line */
 400                 temp2 = strsep(&temp, ":");
 401                 if (!temp2) {
 402                         dbg("cannot parse line '%s'", line);
 403                         continue;
 404                 }
 405                 strncpy(dev.name, temp2, sizeof(dev.name));
 406
 407                 temp2 = strsep(&temp, ":");
 408                 if (!temp2) {
 409                         dbg("cannot parse line '%s'", line);
 410                         continue;
 411                 }
 412                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 413
 414                 temp2 = strsep(&temp, ":");
 415                 if (!temp2) {
 416                         dbg("cannot parse line '%s'", line);
 417                         continue;
 418                 }
 419                 strncpy(dev.group, temp2, sizeof(dev.owner));
 420
 421                 if (!temp) {
 422                         dbg("cannot parse line: %s", line);
 423                         continue;
 424                 }
 425                 dev.mode = strtol(temp, NULL, 8);
 426
 427                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 428                           dev.name, dev.owner, dev.group,
 429                           dev.mode);
 430                 retval = add_perm_dev(&dev);
 431                 if (retval) {
 432                         dbg("add_perm_dev returned with error %d", retval);
 433                         goto exit;
 434                 }
 435         }
 436
 437 exit:
 438         fclose(fd);
 439         return retval;
 440 }
 441
 442