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         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                 dbg_parse("read '%s'", temp);
 173
 174                 /* eat the whitespace */
 175                 while (isspace(*temp))
 176                         ++temp;
 177
 178                 /* empty line? */
 179                 if (*temp == 0x00)
 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                 dbg_parse("unknown type of method '%s'", temp2);
 217                 goto error;
 218 keys:
 219                 /* get all known keys */
 220                 while (1) {
 221                         retval = get_pair(&temp, &temp2, &temp3);
 222                         if (retval)
 223                                 break;
 224
 225                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 226                                 strfieldcpy(dev.bus, temp3);
 227                                 continue;
 228                         }
 229
 230                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 231                                 strfieldcpy(dev.id, temp3);
 232                                 continue;
 233                         }
 234
 235                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 236                                 strfieldcpy(dev.place, temp3);
 237                                 continue;
 238                         }
 239
 240                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 241                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 242                                 int sysfs_pair_num = 0;
 243
 244                                 /* find first unused pair */
 245                                 while (pair->file[0] != '\0') {
 246                                         ++sysfs_pair_num;
 247                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 248                                                 pair = NULL;
 249                                                 break;
 250                                         }
 251                                         ++pair;
 252                                 }
 253                                 if (pair) {
 254                                         /* remove prepended 'SYSFS_' */
 255                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 256                                         strfieldcpy(pair->value, temp3);
 257                                 }
 258                                 continue;
 259                         }
 260
 261                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 262                                 strfieldcpy(dev.kernel_name, temp3);
 263                                 continue;
 264                         }
 265
 266                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 267                                 strfieldcpy(dev.exec_program, temp3);
 268                                 continue;
 269                         }
 270
 271                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 272                                 strfieldcpy(dev.name, temp3);
 273                                 continue;
 274                         }
 275
 276                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 277                                 strfieldcpy(dev.symlink, temp3);
 278                                 continue;
 279                         }
 280
 281                         dbg_parse("unknown type of field '%s'", temp2);
 282                 }
 283
 284                 /* check presence of keys according to method type */
 285                 switch (dev.type) {
 286                 case LABEL:
 287                         dbg_parse(TYPE_LABEL " name='%s', bus='%s', "
 288                                   "sysfs_file[0]='%s', sysfs_value[0]='%s', symlink='%s'",
 289                                   dev.name, dev.bus, dev.sysfs_pair[0].file,
 290                                   dev.sysfs_pair[0].value, dev.symlink);
 291                         if ((*dev.name == '\0') ||
 292                             (*dev.bus == '\0') ||
 293                             (*dev.sysfs_pair[0].file == '\0') ||
 294                             (*dev.sysfs_pair[0].value == '\0'))
 295                                 goto error;
 296                         break;
 297                 case NUMBER:
 298                         dbg_parse(TYPE_NUMBER "name='%s', bus='%s', id='%s', symlink='%s'",
 299                                   dev.name, dev.bus, dev.id, dev.symlink);
 300                         if ((*dev.name == '\0') ||
 301                             (*dev.bus == '\0') ||
 302                             (*dev.id == '\0'))
 303                                 goto error;
 304                         break;
 305                 case TOPOLOGY:
 306                         dbg_parse(TYPE_TOPOLOGY "name='%s', bus='%s', "
 307                                   "place='%s', symlink='%s'",
 308                                   dev.name, dev.bus, dev.place, dev.symlink);
 309                         if ((*dev.name == '\0') ||
 310                             (*dev.bus == '\0') ||
 311                             (*dev.place == '\0'))
 312                                 goto error;
 313                         break;
 314                 case REPLACE:
 315                         dbg_parse(TYPE_REPLACE "name='%s', kernel_name='%s', symlink='%s'",
 316                                   dev.name, dev.kernel_name, dev.symlink);
 317                         if ((*dev.name == '\0') ||
 318                             (*dev.kernel_name == '\0'))
 319                                 goto error;
 320                         break;
 321                 case CALLOUT:
 322                         dbg_parse(TYPE_CALLOUT "name='%s', bus='%s', program='%s', "
 323                                   "id='%s', symlink='%s'",
 324                                   dev.name, dev.bus, dev.exec_program,
 325                                   dev.id, dev.symlink);
 326                         if ((*dev.name == '\0') ||
 327                             (*dev.bus == '\0') ||
 328                             (*dev.id == '\0') ||
 329                             (*dev.exec_program == '\0'))
 330                                 goto error;
 331                         break;
 332                 default:
 333                         dbg_parse("unknown type of method");
 334                         goto error;
 335                 }
 336
 337                 retval = add_config_dev(&dev);
 338                 if (retval) {
 339                         dbg("add_config_dev returned with error %d", retval);
 340                         continue;
 341                 }
 342         }
 343 error:
 344         dbg_parse("%s:%d:%Zd: field missing or parse error", udev_rules_filename,
 345                   lineno, temp - line);
 346 exit:
 347         fclose(fd);
 348         return retval;
 349 }
 350
 351 int namedev_init_permissions(void)
 352 {
 353         char line[255];
 354         char *temp;
 355         char *temp2;
 356         FILE *fd;
 357         int retval = 0;
 358         struct perm_device dev;
 359
 360         fd = fopen(udev_permissions_filename, "r");
 361         if (fd != NULL) {
 362                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 363         } else {
 364                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 365                 return -ENODEV;
 366         }
 367
 368         /* loop through the whole file */
 369         while (1) {
 370                 temp = fgets(line, sizeof(line), fd);
 371                 if (temp == NULL)
 372                         break;
 373
 374                 dbg_parse("read '%s'", temp);
 375
 376                 /* eat the whitespace at the beginning of the line */
 377                 while (isspace(*temp))
 378                         ++temp;
 379
 380                 /* empty line? */
 381                 if (*temp == 0x00)
 382                         continue;
 383
 384                 /* see if this is a comment */
 385                 if (*temp == COMMENT_CHARACTER)
 386                         continue;
 387
 388                 memset(&dev, 0x00, sizeof(dev));
 389
 390                 /* parse the line */
 391                 temp2 = strsep(&temp, ":");
 392                 if (!temp2) {
 393                         dbg("cannot parse line '%s'", line);
 394                         continue;
 395                 }
 396                 strncpy(dev.name, temp2, sizeof(dev.name));
 397
 398                 temp2 = strsep(&temp, ":");
 399                 if (!temp2) {
 400                         dbg("cannot parse line '%s'", line);
 401                         continue;
 402                 }
 403                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 404
 405                 temp2 = strsep(&temp, ":");
 406                 if (!temp2) {
 407                         dbg("cannot parse line '%s'", line);
 408                         continue;
 409                 }
 410                 strncpy(dev.group, temp2, sizeof(dev.owner));
 411
 412                 if (!temp) {
 413                         dbg("cannot parse line: %s", line);
 414                         continue;
 415                 }
 416                 dev.mode = strtol(temp, NULL, 8);
 417
 418                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 419                           dev.name, dev.owner, dev.group,
 420                           dev.mode);
 421                 retval = add_perm_dev(&dev);
 422                 if (retval) {
 423                         dbg("add_perm_dev returned with error %d", retval);
 424                         goto exit;
 425                 }
 426         }
 427
 428 exit:
 429         fclose(fd);
 430         return retval;
 431 }
 432
 433