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 config_device *dev;
 121
 122         list_for_each_entry(dev, &config_device_list, node)
 123                 dump_config_dev(dev);
 124 }
 125
 126 void dump_perm_dev(struct perm_device *dev)
 127 {
 128         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 129                   dev->name, dev->owner, dev->group, dev->mode);
 130 }
 131
 132 void dump_perm_dev_list(void)
 133 {
 134         struct perm_device *dev;
 135
 136         list_for_each_entry(dev, &perm_device_list, node)
 137                 dump_perm_dev(dev);
 138 }
 139
 140
 141 int namedev_init_rules(void)
 142 {
 143         char line[255];
 144         int lineno;
 145         char *temp;
 146         char *temp2;
 147         char *temp3;
 148         FILE *fd;
 149         int retval = 0;
 150         struct config_device dev;
 151
 152         fd = fopen(udev_rules_filename, "r");
 153         if (fd != NULL) {
 154                 dbg("reading '%s' as rules file", udev_rules_filename);
 155         } else {
 156                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 157                 return -ENODEV;
 158         }
 159
 160         /* loop through the whole file */
 161         lineno = 0;
 162         while (1) {
 163                 /* get a line */
 164                 temp = fgets(line, sizeof(line), fd);
 165                 if (temp == NULL)
 166                         goto exit;
 167                 lineno++;
 168                 dbg_parse("read '%s'", temp);
 169
 170                 /* eat the whitespace */
 171                 while (isspace(*temp))
 172                         ++temp;
 173
 174                 /* empty line? */
 175                 if ((*temp == '\0') || (*temp == '\n'))
 176                         continue;
 177
 178                 /* see if this is a comment */
 179                 if (*temp == COMMENT_CHARACTER)
 180                         continue;
 181
 182                 memset(&dev, 0x00, sizeof(struct config_device));
 183
 184                 /* get the method */
 185                 temp2 = strsep(&temp, ",");
 186
 187                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 188                         dev.type = LABEL;
 189                         goto keys;
 190                 }
 191
 192                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 193                         dev.type = NUMBER;
 194                         goto keys;
 195                 }
 196
 197                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 198                         dev.type = TOPOLOGY;
 199                         goto keys;
 200                 }
 201
 202                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 203                         dev.type = REPLACE;
 204                         goto keys;
 205                 }
 206
 207                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 208                         dev.type = CALLOUT;
 209                         goto keys;
 210                 }
 211
 212                 dbg_parse("unknown type of method '%s'", temp2);
 213                 goto error;
 214 keys:
 215                 /* get all known keys */
 216                 while (1) {
 217                         retval = get_pair(&temp, &temp2, &temp3);
 218                         if (retval)
 219                                 break;
 220
 221                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 222                                 strfieldcpy(dev.bus, temp3);
 223                                 continue;
 224                         }
 225
 226                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 227                                 strfieldcpy(dev.id, temp3);
 228                                 continue;
 229                         }
 230
 231                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 232                                 strfieldcpy(dev.place, temp3);
 233                                 continue;
 234                         }
 235
 236                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 237                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 238                                 int sysfs_pair_num = 0;
 239
 240                                 /* find first unused pair */
 241                                 while (pair->file[0] != '\0') {
 242                                         ++sysfs_pair_num;
 243                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 244                                                 pair = NULL;
 245                                                 break;
 246                                         }
 247                                         ++pair;
 248                                 }
 249                                 if (pair) {
 250                                         /* remove prepended 'SYSFS_' */
 251                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 252                                         strfieldcpy(pair->value, temp3);
 253                                 }
 254                                 continue;
 255                         }
 256
 257                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 258                                 strfieldcpy(dev.kernel_name, temp3);
 259                                 continue;
 260                         }
 261
 262                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 263                                 strfieldcpy(dev.exec_program, temp3);
 264                                 continue;
 265                         }
 266
 267                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 268                                 strfieldcpy(dev.name, temp3);
 269                                 continue;
 270                         }
 271
 272                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 273                                 strfieldcpy(dev.symlink, temp3);
 274                                 continue;
 275                         }
 276
 277                         dbg_parse("unknown type of field '%s'", temp2);
 278                 }
 279
 280                 /* check presence of keys according to method type */
 281                 switch (dev.type) {
 282                 case LABEL:
 283                         dbg_parse(TYPE_LABEL " name='%s', bus='%s', "
 284                                   "sysfs_file[0]='%s', sysfs_value[0]='%s', symlink='%s'",
 285                                   dev.name, dev.bus, dev.sysfs_pair[0].file,
 286                                   dev.sysfs_pair[0].value, dev.symlink);
 287                         if ((*dev.name == '\0') ||
 288                             (*dev.sysfs_pair[0].file == '\0') ||
 289                             (*dev.sysfs_pair[0].value == '\0'))
 290                                 goto error;
 291                         break;
 292                 case NUMBER:
 293                         dbg_parse(TYPE_NUMBER " name='%s', bus='%s', id='%s', symlink='%s'",
 294                                   dev.name, dev.bus, dev.id, dev.symlink);
 295                         if ((*dev.name == '\0') ||
 296                             (*dev.bus == '\0') ||
 297                             (*dev.id == '\0'))
 298                                 goto error;
 299                         break;
 300                 case TOPOLOGY:
 301                         dbg_parse(TYPE_TOPOLOGY " name='%s', bus='%s', "
 302                                   "place='%s', symlink='%s'",
 303                                   dev.name, dev.bus, dev.place, dev.symlink);
 304                         if ((*dev.name == '\0') ||
 305                             (*dev.bus == '\0') ||
 306                             (*dev.place == '\0'))
 307                                 goto error;
 308                         break;
 309                 case REPLACE:
 310                         dbg_parse(TYPE_REPLACE " name='%s', kernel_name='%s', symlink='%s'",
 311                                   dev.name, dev.kernel_name, dev.symlink);
 312                         if ((*dev.name == '\0') ||
 313                             (*dev.kernel_name == '\0'))
 314                                 goto error;
 315                         break;
 316                 case CALLOUT:
 317                         dbg_parse(TYPE_CALLOUT " name='%s', bus='%s', program='%s', "
 318                                   "id='%s', symlink='%s'",
 319                                   dev.name, dev.bus, dev.exec_program,
 320                                   dev.id, dev.symlink);
 321                         if ((*dev.name == '\0') ||
 322                             (*dev.id == '\0') ||
 323                             (*dev.exec_program == '\0'))
 324                                 goto error;
 325                         break;
 326                 default:
 327                         dbg_parse("unknown type of method");
 328                         goto error;
 329                 }
 330
 331                 retval = add_config_dev(&dev);
 332                 if (retval) {
 333                         dbg("add_config_dev returned with error %d", retval);
 334                         continue;
 335                 }
 336         }
 337 error:
 338         dbg_parse("%s:%d:%Zd: field missing or parse error", udev_rules_filename,
 339                   lineno, temp - line);
 340 exit:
 341         fclose(fd);
 342         return retval;
 343 }
 344
 345 int namedev_init_permissions(void)
 346 {
 347         char line[255];
 348         char *temp;
 349         char *temp2;
 350         FILE *fd;
 351         int retval = 0;
 352         struct perm_device dev;
 353
 354         fd = fopen(udev_permissions_filename, "r");
 355         if (fd != NULL) {
 356                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 357         } else {
 358                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 359                 return -ENODEV;
 360         }
 361
 362         /* loop through the whole file */
 363         while (1) {
 364                 temp = fgets(line, sizeof(line), fd);
 365                 if (temp == NULL)
 366                         break;
 367
 368                 dbg_parse("read '%s'", temp);
 369
 370                 /* eat the whitespace at the beginning of the line */
 371                 while (isspace(*temp))
 372                         ++temp;
 373
 374                 /* empty line? */
 375                 if ((*temp == '\0') || (*temp == '\n'))
 376                         continue;
 377
 378                 /* see if this is a comment */
 379                 if (*temp == COMMENT_CHARACTER)
 380                         continue;
 381
 382                 memset(&dev, 0x00, sizeof(dev));
 383
 384                 /* parse the line */
 385                 temp2 = strsep(&temp, ":");
 386                 if (!temp2) {
 387                         dbg("cannot parse line '%s'", line);
 388                         continue;
 389                 }
 390                 strncpy(dev.name, temp2, sizeof(dev.name));
 391
 392                 temp2 = strsep(&temp, ":");
 393                 if (!temp2) {
 394                         dbg("cannot parse line '%s'", line);
 395                         continue;
 396                 }
 397                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 398
 399                 temp2 = strsep(&temp, ":");
 400                 if (!temp2) {
 401                         dbg("cannot parse line '%s'", line);
 402                         continue;
 403                 }
 404                 strncpy(dev.group, temp2, sizeof(dev.owner));
 405
 406                 if (!temp) {
 407                         dbg("cannot parse line: %s", line);
 408                         continue;
 409                 }
 410                 dev.mode = strtol(temp, NULL, 8);
 411
 412                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 413                           dev.name, dev.owner, dev.group,
 414                           dev.mode);
 415                 retval = add_perm_dev(&dev);
 416                 if (retval) {
 417                         dbg("add_perm_dev returned with error %d", retval);
 418                         goto exit;
 419                 }
 420         }
 421
 422 exit:
 423         fclose(fd);
 424         return retval;
 425 }
 426
 427