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) || *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 void dump_config_dev(struct config_device *dev)
  75 {
  76         switch (dev->type) {
  77         case KERNEL_NAME:
  78                 dbg_parse("KERNEL name='%s'", dev->name);
  79                 break;
  80         case LABEL:
  81                 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s'",
  82                           dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value);
  83                 break;
  84         case NUMBER:
  85                 dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
  86                           dev->name, dev->bus, dev->id);
  87                 break;
  88         case TOPOLOGY:
  89                 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
  90                           dev->name, dev->bus, dev->place);
  91                 break;
  92         case REPLACE:
  93                 dbg_parse("REPLACE name=%s, kernel_name=%s",
  94                           dev->name, dev->kernel_name);
  95                 break;
  96         case CALLOUT:
  97                 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s'",
  98                           dev->name, dev->bus, dev->exec_program, dev->id);
  99                 break;
 100         default:
 101                 dbg_parse("unknown type of method");
 102         }
 103 }
 104
 105 void dump_config_dev_list(void)
 106 {
 107         struct list_head *tmp;
 108
 109         list_for_each(tmp, &config_device_list) {
 110                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 111                 dump_config_dev(dev);
 112         }
 113 }
 114
 115 void dump_perm_dev(struct perm_device *dev)
 116 {
 117         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 118                   dev->name, dev->owner, dev->group, dev->mode);
 119 }
 120
 121 void dump_perm_dev_list(void)
 122 {
 123         struct list_head *tmp;
 124
 125         list_for_each(tmp, &perm_device_list) {
 126                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 127                 dump_perm_dev(dev);
 128         }
 129 }
 130
 131
 132 int namedev_init_rules(void)
 133 {
 134         char line[255];
 135         int lineno;
 136         char *temp;
 137         char *temp2;
 138         char *temp3;
 139         FILE *fd;
 140         int retval = 0;
 141         struct config_device dev;
 142
 143         fd = fopen(udev_rules_filename, "r");
 144         if (fd != NULL) {
 145                 dbg("reading '%s' as rules file", udev_rules_filename);
 146         } else {
 147                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 148                 return -ENODEV;
 149         }
 150
 151         /* loop through the whole file */
 152         lineno = 0;
 153         while (1) {
 154                 /* get a line */
 155                 temp = fgets(line, sizeof(line), fd);
 156                 if (temp == NULL)
 157                         goto exit;
 158                 lineno++;
 159                 dbg_parse("read '%s'", temp);
 160
 161                 /* empty line? */
 162                 if (*temp == 0x00)
 163                         continue;
 164
 165                 /* see if this is a comment */
 166                 if (*temp == COMMENT_CHARACTER)
 167                         continue;
 168
 169                 /* eat the whitespace */
 170                 while (isspace(*temp))
 171                         ++temp;
 172
 173                 memset(&dev, 0x00, sizeof(struct config_device));
 174
 175                 /* get the method */
 176                 temp2 = strsep(&temp, ",");
 177
 178                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 179                         dev.type = LABEL;
 180                         goto keys;
 181                 }
 182
 183                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 184                         dev.type = NUMBER;
 185                         goto keys;
 186                 }
 187
 188                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 189                         dev.type = TOPOLOGY;
 190                         goto keys;
 191                 }
 192
 193                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 194                         dev.type = REPLACE;
 195                         goto keys;
 196                 }
 197
 198                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 199                         dev.type = CALLOUT;
 200                         goto keys;
 201                 }
 202
 203                 dbg_parse("unknown type of method '%s'", temp2);
 204                 goto error;
 205 keys:
 206                 /* get all known keys */
 207                 while (1) {
 208                         retval = get_pair(&temp, &temp2, &temp3);
 209                         if (retval)
 210                                 break;
 211
 212                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 213                                 strfieldcpy(dev.bus, temp3);
 214                                 continue;
 215                         }
 216
 217                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 218                                 strfieldcpy(dev.id, temp3);
 219                                 continue;
 220                         }
 221
 222                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 223                                 strfieldcpy(dev.place, temp3);
 224                                 continue;
 225                         }
 226
 227                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 228                                 /* remove prepended 'SYSFS_' */
 229                                 strfieldcpy(dev.sysfs_file, temp2 + sizeof(FIELD_SYSFS)-1);
 230                                 strfieldcpy(dev.sysfs_value, temp3);
 231                                 continue;
 232                         }
 233
 234                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 235                                 strfieldcpy(dev.kernel_name, temp3);
 236                                 continue;
 237                         }
 238
 239                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 240                                 strfieldcpy(dev.exec_program, temp3);
 241                                 continue;
 242                         }
 243
 244                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 245                                 strfieldcpy(dev.name, temp3);
 246                                 continue;
 247                         }
 248
 249                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 250                                 strfieldcpy(dev.symlink, temp3);
 251                                 continue;
 252                         }
 253
 254                         dbg_parse("unknown type of field '%s'", temp2);
 255                 }
 256
 257                 /* check presence of keys according to method type */
 258                 switch (dev.type) {
 259                 case LABEL:
 260                         dbg_parse("LABEL name='%s', bus='%s', "
 261                                   "sysfs_file='%s', sysfs_value='%s', symlink='%s'",
 262                                   dev.name, dev.bus, dev.sysfs_file,
 263                                   dev.sysfs_value, dev.symlink);
 264                         if ((*dev.name == '\0') ||
 265                             (*dev.bus == '\0') ||
 266                             (*dev.sysfs_file == '\0') ||
 267                             (*dev.sysfs_value == '\0'))
 268                                 goto error;
 269                         break;
 270                 case NUMBER:
 271                         dbg_parse("NUMBER name='%s', bus='%s', id='%s', symlink='%s'",
 272                                   dev.name, dev.bus, dev.id, dev.symlink);
 273                         if ((*dev.name == '\0') ||
 274                             (*dev.bus == '\0') ||
 275                             (*dev.id == '\0'))
 276                                 goto error;
 277                         break;
 278                 case TOPOLOGY:
 279                         dbg_parse("TOPOLOGY name='%s', bus='%s', "
 280                                   "place='%s', symlink='%s'",
 281                                   dev.name, dev.bus, dev.place, dev.symlink);
 282                         if ((*dev.name == '\0') ||
 283                             (*dev.bus == '\0') ||
 284                             (*dev.place == '\0'))
 285                                 goto error;
 286                         break;
 287                 case REPLACE:
 288                         dbg_parse("REPLACE name='%s', kernel_name='%s', symlink='%s'",
 289                                   dev.name, dev.kernel_name, dev.symlink);
 290                         if ((*dev.name == '\0') ||
 291                             (*dev.kernel_name == '\0'))
 292                                 goto error;
 293                         break;
 294                 case CALLOUT:
 295                         dbg_parse("CALLOUT name='%s', bus='%s', program='%s', "
 296                                   "id='%s', symlink='%s'",
 297                                   dev.name, dev.bus, dev.exec_program,
 298                                   dev.id, dev.symlink);
 299                         if ((*dev.name == '\0') ||
 300                             (*dev.bus == '\0') ||
 301                             (*dev.id == '\0') ||
 302                             (*dev.exec_program == '\0'))
 303                                 goto error;
 304                         break;
 305                 default:
 306                         dbg_parse("xxx default method");
 307                         goto error;
 308                 }
 309
 310                 retval = add_config_dev(&dev);
 311                 if (retval) {
 312                         dbg("add_config_dev returned with error %d", retval);
 313                         continue;
 314                 }
 315         }
 316 error:
 317         dbg_parse("%s:%d:%Zd: field missing or parse error", udev_rules_filename,
 318                   lineno, temp - line);
 319 exit:
 320         fclose(fd);
 321         return retval;
 322 }
 323
 324 int namedev_init_permissions(void)
 325 {
 326         char line[255];
 327         char *temp;
 328         char *temp2;
 329         FILE *fd;
 330         int retval = 0;
 331         struct perm_device dev;
 332
 333         fd = fopen(udev_permissions_filename, "r");
 334         if (fd != NULL) {
 335                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 336         } else {
 337                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 338                 return -ENODEV;
 339         }
 340
 341         /* loop through the whole file */
 342         while (1) {
 343                 temp = fgets(line, sizeof(line), fd);
 344                 if (temp == NULL)
 345                         break;
 346
 347                 dbg_parse("read '%s'", temp);
 348
 349                 /* eat the whitespace at the beginning of the line */
 350                 while (isspace(*temp))
 351                         ++temp;
 352
 353                 /* empty line? */
 354                 if (*temp == 0x00)
 355                         continue;
 356
 357                 /* see if this is a comment */
 358                 if (*temp == COMMENT_CHARACTER)
 359                         continue;
 360
 361                 memset(&dev, 0x00, sizeof(dev));
 362
 363                 /* parse the line */
 364                 temp2 = strsep(&temp, ":");
 365                 if (!temp2) {
 366                         dbg("cannot parse line '%s'", line);
 367                         continue;
 368                 }
 369                 strncpy(dev.name, temp2, sizeof(dev.name));
 370
 371                 temp2 = strsep(&temp, ":");
 372                 if (!temp2) {
 373                         dbg("cannot parse line '%s'", line);
 374                         continue;
 375                 }
 376                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 377
 378                 temp2 = strsep(&temp, ":");
 379                 if (!temp2) {
 380                         dbg("cannot parse line '%s'", line);
 381                         continue;
 382                 }
 383                 strncpy(dev.group, temp2, sizeof(dev.owner));
 384
 385                 if (!temp) {
 386                         dbg("cannot parse line: %s", line);
 387                         continue;
 388                 }
 389                 dev.mode = strtol(temp, NULL, 8);
 390
 391                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 392                           dev.name, dev.owner, dev.group,
 393                           dev.mode);
 394                 retval = add_perm_dev(&dev);
 395                 if (retval) {
 396                         dbg("add_perm_dev returned with error %d", retval);
 397                         goto exit;
 398                 }
 399         }
 400
 401 exit:
 402         fclose(fd);
 403         return retval;
 404 }
 405
 406