namedev_parse.c

   1 /*
   2  * namedev_parse.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003,2004 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 #ifdef DEBUG
  25 /* define this to enable parsing debugging also */
  26 /* #define DEBUG_PARSER */
  27 #endif
  28
  29 #include <stddef.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <stdio.h>
  33 #include <fcntl.h>
  34 #include <ctype.h>
  35 #include <unistd.h>
  36 #include <sys/stat.h>
  37 #include <dirent.h>
  38 #include <errno.h>
  39
  40 #include "udev.h"
  41 #include "logging.h"
  42 #include "namedev.h"
  43
  44 LIST_HEAD(file_list);
  45
  46 static int add_config_dev(struct config_device *new_dev)
  47 {
  48         struct config_device *tmp_dev;
  49
  50         tmp_dev = malloc(sizeof(*tmp_dev));
  51         if (tmp_dev == NULL)
  52                 return -ENOMEM;
  53         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  54         list_add_tail(&tmp_dev->node, &config_device_list);
  55         //dump_config_dev(tmp_dev);
  56         return 0;
  57 }
  58
  59 void dump_config_dev(struct config_device *dev)
  60 {
  61         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  62                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  63                   "kernel='%s', program='%s', result='%s'",
  64                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  65                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  66                   dev->kernel, dev->program, dev->result);
  67 }
  68
  69 void dump_config_dev_list(void)
  70 {
  71         struct config_device *dev;
  72
  73         list_for_each_entry(dev, &config_device_list, node)
  74                 dump_config_dev(dev);
  75 }
  76
  77 void dump_perm_dev(struct perm_device *dev)
  78 {
  79         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
  80                   dev->name, dev->owner, dev->group, dev->mode);
  81 }
  82
  83 void dump_perm_dev_list(void)
  84 {
  85         struct perm_device *dev;
  86
  87         list_for_each_entry(dev, &perm_device_list, node)
  88                 dump_perm_dev(dev);
  89 }
  90
  91 /* extract possible KEY{attr} or KEY_attr */
  92 static char *get_key_attribute(char *str)
  93 {
  94         char *pos;
  95         char *attr;
  96
  97         attr = strchr(str, '{');
  98         if (attr != NULL) {
  99                 attr++;
 100                 pos = strchr(attr, '}');
 101                 if (pos == NULL) {
 102                         dbg("missing closing brace for format");
 103                         return NULL;
 104                 }
 105                 pos[0] = '\0';
 106                 dbg("attribute='%s'", attr);
 107                 return attr;
 108         }
 109
 110         attr = strchr(str, '_');
 111         if (attr != NULL) {
 112                 attr++;
 113                 dbg("attribute='%s'", attr);
 114                 return attr;
 115         }
 116
 117         return NULL;
 118 }
 119
 120 static int namedev_parse_rules(char *filename)
 121 {
 122         char line[255];
 123         int lineno;
 124         char *temp;
 125         char *temp2;
 126         char *temp3;
 127         char *attr;
 128         FILE *fd;
 129         int program_given = 0;
 130         int retval = 0;
 131         struct config_device dev;
 132
 133         fd = fopen(filename, "r");
 134         if (fd != NULL) {
 135                 dbg("reading '%s' as rules file", filename);
 136         } else {
 137                 dbg("can't open '%s' as a rules file", filename);
 138                 return -ENODEV;
 139         }
 140
 141         /* loop through the whole file */
 142         lineno = 0;
 143         while (1) {
 144                 /* get a line */
 145                 temp = fgets(line, sizeof(line), fd);
 146                 if (temp == NULL)
 147                         goto exit;
 148                 lineno++;
 149                 dbg_parse("read '%s'", temp);
 150
 151                 /* eat the whitespace */
 152                 while (isspace(*temp))
 153                         ++temp;
 154
 155                 /* empty line? */
 156                 if ((*temp == '\0') || (*temp == '\n'))
 157                         continue;
 158
 159                 /* see if this is a comment */
 160                 if (*temp == COMMENT_CHARACTER)
 161                         continue;
 162
 163                 memset(&dev, 0x00, sizeof(struct config_device));
 164
 165                 /* get all known keys */
 166                 while (1) {
 167                         retval = parse_get_pair(&temp, &temp2, &temp3);
 168                         if (retval)
 169                                 break;
 170
 171                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 172                                 strfieldcpy(dev.bus, temp3);
 173                                 continue;
 174                         }
 175
 176                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 177                                 strfieldcpy(dev.id, temp3);
 178                                 continue;
 179                         }
 180
 181                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 182                                 strfieldcpy(dev.place, temp3);
 183                                 continue;
 184                         }
 185
 186                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 187                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 188                                 int sysfs_pair_num = 0;
 189
 190                                 /* find first unused pair */
 191                                 while (pair->file[0] != '\0') {
 192                                         ++sysfs_pair_num;
 193                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 194                                                 pair = NULL;
 195                                                 break;
 196                                         }
 197                                         ++pair;
 198                                 }
 199                                 if (pair) {
 200                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 201                                         if (attr == NULL) {
 202                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 203                                                 continue;
 204                                         }
 205                                         strfieldcpy(pair->file, attr);
 206                                         strfieldcpy(pair->value, temp3);
 207                                 }
 208                                 continue;
 209                         }
 210
 211                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 212                                 strfieldcpy(dev.kernel, temp3);
 213                                 continue;
 214                         }
 215
 216                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 217                                 program_given = 1;
 218                                 strfieldcpy(dev.program, temp3);
 219                                 continue;
 220                         }
 221
 222                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 223                                 strfieldcpy(dev.result, temp3);
 224                                 continue;
 225                         }
 226
 227                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 228                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 229                                 if (attr != NULL)
 230                                         if (strcasecmp(attr, ATTR_PARTITIONS) == 0) {
 231                                                 dbg_parse("creation of partition nodes requested");
 232                                                 dev.partitions = PARTITIONS_COUNT;
 233                                         }
 234                                 strfieldcpy(dev.name, temp3);
 235                                 continue;
 236                         }
 237
 238                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 239                                 strfieldcpy(dev.symlink, temp3);
 240                                 continue;
 241                         }
 242
 243                         dbg("unknown type of field '%s'", temp2);
 244                         dbg("You might be using a rules file in the old format, please fix.");
 245                         goto error;
 246                 }
 247
 248                 /* simple plausibility check for given keys */
 249                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 250                     (dev.sysfs_pair[0].value[0] == '\0')) {
 251                         dbg("inconsistency in " FIELD_SYSFS " key");
 252                         goto error;
 253                 }
 254
 255                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 256                         dbg(FIELD_RESULT " is only useful when "
 257                             FIELD_PROGRAM " is called in any rule before");
 258                         goto error;
 259                 }
 260
 261                 dev.config_line = lineno;
 262                 strfieldcpy(dev.config_file, filename);
 263                 retval = add_config_dev(&dev);
 264                 if (retval) {
 265                         dbg("add_config_dev returned with error %d", retval);
 266                         continue;
 267 error:
 268                         dbg("%s:%d:%d: parse error, rule skipped",
 269                             filename, lineno, temp - line);
 270                 }
 271         }
 272 exit:
 273         fclose(fd);
 274         return retval;
 275 }
 276
 277 static int namedev_parse_permissions(char *filename)
 278 {
 279         char line[255];
 280         char *temp;
 281         char *temp2;
 282         FILE *fd;
 283         int retval = 0;
 284         struct perm_device dev;
 285
 286         fd = fopen(filename, "r");
 287         if (fd != NULL) {
 288                 dbg("reading '%s' as permissions file", filename);
 289         } else {
 290                 dbg("can't open '%s' as permissions file", filename);
 291                 return -ENODEV;
 292         }
 293
 294         /* loop through the whole file */
 295         while (1) {
 296                 temp = fgets(line, sizeof(line), fd);
 297                 if (temp == NULL)
 298                         break;
 299
 300                 dbg_parse("read '%s'", temp);
 301
 302                 /* eat the whitespace at the beginning of the line */
 303                 while (isspace(*temp))
 304                         ++temp;
 305
 306                 /* empty line? */
 307                 if ((*temp == '\0') || (*temp == '\n'))
 308                         continue;
 309
 310                 /* see if this is a comment */
 311                 if (*temp == COMMENT_CHARACTER)
 312                         continue;
 313
 314                 memset(&dev, 0x00, sizeof(dev));
 315
 316                 /* parse the line */
 317                 temp2 = strsep(&temp, ":");
 318                 if (!temp2) {
 319                         dbg("cannot parse line '%s'", line);
 320                         continue;
 321                 }
 322                 strfieldcpy(dev.name, temp2);
 323
 324                 temp2 = strsep(&temp, ":");
 325                 if (!temp2) {
 326                         dbg("cannot parse line '%s'", line);
 327                         continue;
 328                 }
 329                 strfieldcpy(dev.owner, temp2);
 330
 331                 temp2 = strsep(&temp, ":");
 332                 if (!temp2) {
 333                         dbg("cannot parse line '%s'", line);
 334                         continue;
 335                 }
 336                 strfieldcpy(dev.group, temp2);
 337
 338                 if (!temp) {
 339                         dbg("cannot parse line: %s", line);
 340                         continue;
 341                 }
 342                 dev.mode = strtol(temp, NULL, 8);
 343
 344                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 345                           dev.name, dev.owner, dev.group,
 346                           dev.mode);
 347                 retval = add_perm_dev(&dev);
 348                 if (retval) {
 349                         dbg("add_perm_dev returned with error %d", retval);
 350                         goto exit;
 351                 }
 352         }
 353
 354 exit:
 355         fclose(fd);
 356         return retval;
 357 }
 358
 359 struct files {
 360         struct list_head list;
 361         char name[NAME_SIZE];
 362 };
 363
 364 /* sort files in lexical order */
 365 static int file_list_insert(char *filename)
 366 {
 367         struct files *loop_file;
 368         struct files *new_file;
 369
 370         list_for_each_entry(loop_file, &file_list, list) {
 371                 if (strcmp(loop_file->name, filename) > 0) {
 372                         break;
 373                 }
 374         }
 375
 376         new_file = malloc(sizeof(struct files));
 377         if (new_file == NULL) {
 378                 dbg("error malloc");
 379                 return -ENOMEM;
 380         }
 381
 382         strfieldcpy(new_file->name, filename);
 383         list_add_tail(&new_file->list, &loop_file->list);
 384         return 0;
 385 }
 386
 387 /* calls function for file or every file found in directory */
 388 static int call_foreach_file(int parser (char *f) , char *filename, char *extension)
 389 {
 390         struct dirent *ent;
 391         DIR *dir;
 392         char *ext;
 393         char file[NAME_SIZE];
 394         struct stat stats;
 395         struct files *loop_file;
 396         struct files *tmp_file;
 397
 398         /* look if we have a plain file or a directory to scan */
 399         stat(filename, &stats);
 400         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 401                 return parser(filename);
 402
 403         /* sort matching filename into list */
 404         dbg("open config as directory '%s'", filename);
 405         dir = opendir(filename);
 406         while (1) {
 407                 ent = readdir(dir);
 408                 if (ent == NULL || ent->d_name[0] == '\0')
 409                         break;
 410
 411                 dbg("found file '%s'", ent->d_name);
 412                 ext = strrchr(ent->d_name, '.');
 413                 if (ext == NULL)
 414                         continue;
 415
 416                 if (strcmp(ext, extension) == 0) {
 417                         dbg("put file in list '%s'", ent->d_name);
 418                         file_list_insert(ent->d_name);
 419                 }
 420         }
 421
 422         /* parse every file in the list */
 423         list_for_each_entry_safe(loop_file, tmp_file, &file_list, list) {
 424                 strfieldcpy(file, filename);
 425                 strfieldcat(file, loop_file->name);
 426                 parser(file);
 427                 list_del(&loop_file->list);
 428                 free(loop_file);
 429         }
 430
 431         closedir(dir);
 432         return 0;
 433 }
 434
 435 int namedev_init_rules()
 436 {
 437         return call_foreach_file(namedev_parse_rules, udev_rules_filename, RULEFILE_EXT);
 438 }
 439
 440 int namedev_init_permissions()
 441 {
 442         return call_foreach_file(namedev_parse_permissions, udev_permissions_filename, PERMFILE_EXT);
 443 }