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
  47 static int add_config_dev(struct config_device *new_dev)
  48 {
  49         struct config_device *tmp_dev;
  50
  51         tmp_dev = malloc(sizeof(*tmp_dev));
  52         if (tmp_dev == NULL)
  53                 return -ENOMEM;
  54         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  55         list_add_tail(&tmp_dev->node, &config_device_list);
  56         //dump_config_dev(tmp_dev);
  57         return 0;
  58 }
  59
  60 void dump_config_dev(struct config_device *dev)
  61 {
  62         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  63                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  64                   "kernel='%s', program='%s', result='%s'",
  65                   "owner='%s', group='%s', mode=%#o",
  66                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  67                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  68                   dev->kernel, dev->program, dev->result,
  69                   dev->owner, dev->group, dev->mode);
  70 }
  71
  72 void dump_config_dev_list(void)
  73 {
  74         struct config_device *dev;
  75
  76         list_for_each_entry(dev, &config_device_list, node)
  77                 dump_config_dev(dev);
  78 }
  79
  80 static int add_perm_dev(struct perm_device *new_dev)
  81 {
  82         struct perm_device *dev;
  83         struct perm_device *tmp_dev;
  84
  85         /* update the values if we already have the device */
  86         list_for_each_entry(dev, &perm_device_list, node) {
  87                 if (strcmp(new_dev->name, dev->name) != 0)
  88                         continue;
  89
  90                 set_empty_perms(dev, new_dev->mode, new_dev->owner, new_dev->group);
  91                 return 0;
  92         }
  93
  94         /* not found, add new structure to the perm list */
  95         tmp_dev = malloc(sizeof(*tmp_dev));
  96         if (!tmp_dev)
  97                 return -ENOMEM;
  98
  99         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 100         list_add_tail(&tmp_dev->node, &perm_device_list);
 101         //dump_perm_dev(tmp_dev);
 102         return 0;
 103 }
 104
 105 void dump_perm_dev(struct perm_device *dev)
 106 {
 107         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 108                   dev->name, dev->owner, dev->group, dev->mode);
 109 }
 110
 111 void dump_perm_dev_list(void)
 112 {
 113         struct perm_device *dev;
 114
 115         list_for_each_entry(dev, &perm_device_list, node)
 116                 dump_perm_dev(dev);
 117 }
 118
 119 /* extract possible KEY{attr} or KEY_attr */
 120 static char *get_key_attribute(char *str)
 121 {
 122         char *pos;
 123         char *attr;
 124
 125         attr = strchr(str, '{');
 126         if (attr != NULL) {
 127                 attr++;
 128                 pos = strchr(attr, '}');
 129                 if (pos == NULL) {
 130                         dbg("missing closing brace for format");
 131                         return NULL;
 132                 }
 133                 pos[0] = '\0';
 134                 dbg("attribute='%s'", attr);
 135                 return attr;
 136         }
 137
 138         attr = strchr(str, '_');
 139         if (attr != NULL) {
 140                 attr++;
 141                 dbg("attribute='%s'", attr);
 142                 return attr;
 143         }
 144
 145         return NULL;
 146 }
 147
 148 static int namedev_parse_rules(char *filename)
 149 {
 150         char line[255];
 151         int lineno;
 152         char *temp;
 153         char *temp2;
 154         char *temp3;
 155         char *attr;
 156         FILE *fd;
 157         int program_given = 0;
 158         int retval = 0;
 159         struct config_device dev;
 160
 161         fd = fopen(filename, "r");
 162         if (fd != NULL) {
 163                 dbg("reading '%s' as rules file", filename);
 164         } else {
 165                 dbg("can't open '%s' as a rules file", filename);
 166                 return -ENODEV;
 167         }
 168
 169         /* loop through the whole file */
 170         lineno = 0;
 171         while (1) {
 172                 /* get a line */
 173                 temp = fgets(line, sizeof(line), fd);
 174                 if (temp == NULL)
 175                         goto exit;
 176                 lineno++;
 177                 dbg_parse("read '%s'", temp);
 178
 179                 /* eat the whitespace */
 180                 while (isspace(*temp))
 181                         ++temp;
 182
 183                 /* empty line? */
 184                 if ((*temp == '\0') || (*temp == '\n'))
 185                         continue;
 186
 187                 /* see if this is a comment */
 188                 if (*temp == COMMENT_CHARACTER)
 189                         continue;
 190
 191                 memset(&dev, 0x00, sizeof(struct config_device));
 192
 193                 /* get all known keys */
 194                 while (1) {
 195                         retval = parse_get_pair(&temp, &temp2, &temp3);
 196                         if (retval)
 197                                 break;
 198
 199                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 200                                 strfieldcpy(dev.bus, temp3);
 201                                 continue;
 202                         }
 203
 204                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 205                                 strfieldcpy(dev.id, temp3);
 206                                 continue;
 207                         }
 208
 209                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 210                                 strfieldcpy(dev.place, temp3);
 211                                 continue;
 212                         }
 213
 214                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 215                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 216                                 int sysfs_pair_num = 0;
 217
 218                                 /* find first unused pair */
 219                                 while (pair->file[0] != '\0') {
 220                                         ++sysfs_pair_num;
 221                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 222                                                 pair = NULL;
 223                                                 break;
 224                                         }
 225                                         ++pair;
 226                                 }
 227                                 if (pair) {
 228                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 229                                         if (attr == NULL) {
 230                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 231                                                 continue;
 232                                         }
 233                                         strfieldcpy(pair->file, attr);
 234                                         strfieldcpy(pair->value, temp3);
 235                                 }
 236                                 continue;
 237                         }
 238
 239                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 240                                 strfieldcpy(dev.kernel, temp3);
 241                                 continue;
 242                         }
 243
 244                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 245                                 program_given = 1;
 246                                 strfieldcpy(dev.program, temp3);
 247                                 continue;
 248                         }
 249
 250                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 251                                 strfieldcpy(dev.result, temp3);
 252                                 continue;
 253                         }
 254
 255                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 256                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 257                                 if (attr != NULL)
 258                                         if (strcasecmp(attr, ATTR_PARTITIONS) == 0) {
 259                                                 dbg_parse("creation of partition nodes requested");
 260                                                 dev.partitions = PARTITIONS_COUNT;
 261                                         }
 262                                 strfieldcpy(dev.name, temp3);
 263                                 continue;
 264                         }
 265
 266                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 267                                 strfieldcpy(dev.symlink, temp3);
 268                                 continue;
 269                         }
 270
 271                         if (strcasecmp(temp2, FIELD_OWNER) == 0) {
 272                                 strfieldcpy(dev.owner, temp3);
 273                                 continue;
 274                         }
 275
 276                         if (strcasecmp(temp2, FIELD_GROUP) == 0) {
 277                                 strfieldcpy(dev.group, temp3);
 278                                 continue;
 279                         }
 280
 281                         if (strcasecmp(temp2, FIELD_MODE) == 0) {
 282                                 dev.mode = strtol(temp3, NULL, 8);
 283                                 continue;
 284                         }
 285
 286                         dbg("unknown type of field '%s'", temp2);
 287                         goto error;
 288                 }
 289
 290                 /* simple plausibility checks for given keys */
 291                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 292                     (dev.sysfs_pair[0].value[0] == '\0')) {
 293                         dbg("inconsistency in " FIELD_SYSFS " key");
 294                         goto error;
 295                 }
 296
 297                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 298                         dbg(FIELD_RESULT " is only useful when "
 299                             FIELD_PROGRAM " is called in any rule before");
 300                         goto error;
 301                 }
 302
 303                 dev.config_line = lineno;
 304                 strfieldcpy(dev.config_file, filename);
 305                 retval = add_config_dev(&dev);
 306                 if (retval) {
 307                         dbg("add_config_dev returned with error %d", retval);
 308                         continue;
 309 error:
 310                         dbg("%s:%d:%d: parse error, rule skipped",
 311                             filename, lineno, temp - line);
 312                 }
 313         }
 314 exit:
 315         fclose(fd);
 316         return retval;
 317 }
 318
 319 static int namedev_parse_permissions(char *filename)
 320 {
 321         char line[255];
 322         char *temp;
 323         char *temp2;
 324         FILE *fd;
 325         int retval = 0;
 326         struct perm_device dev;
 327
 328         fd = fopen(filename, "r");
 329         if (fd != NULL) {
 330                 dbg("reading '%s' as permissions file", filename);
 331         } else {
 332                 dbg("can't open '%s' as permissions file", filename);
 333                 return -ENODEV;
 334         }
 335
 336         /* loop through the whole file */
 337         while (1) {
 338                 temp = fgets(line, sizeof(line), fd);
 339                 if (temp == NULL)
 340                         break;
 341
 342                 dbg_parse("read '%s'", temp);
 343
 344                 /* eat the whitespace at the beginning of the line */
 345                 while (isspace(*temp))
 346                         ++temp;
 347
 348                 /* empty line? */
 349                 if ((*temp == '\0') || (*temp == '\n'))
 350                         continue;
 351
 352                 /* see if this is a comment */
 353                 if (*temp == COMMENT_CHARACTER)
 354                         continue;
 355
 356                 memset(&dev, 0x00, sizeof(dev));
 357
 358                 /* parse the line */
 359                 temp2 = strsep(&temp, ":");
 360                 if (!temp2) {
 361                         dbg("cannot parse line '%s'", line);
 362                         continue;
 363                 }
 364                 strfieldcpy(dev.name, temp2);
 365
 366                 temp2 = strsep(&temp, ":");
 367                 if (!temp2) {
 368                         dbg("cannot parse line '%s'", line);
 369                         continue;
 370                 }
 371                 strfieldcpy(dev.owner, temp2);
 372
 373                 temp2 = strsep(&temp, ":");
 374                 if (!temp2) {
 375                         dbg("cannot parse line '%s'", line);
 376                         continue;
 377                 }
 378                 strfieldcpy(dev.group, temp2);
 379
 380                 if (!temp) {
 381                         dbg("cannot parse line '%s'", line);
 382                         continue;
 383                 }
 384                 dev.mode = strtol(temp, NULL, 8);
 385
 386                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 387                           dev.name, dev.owner, dev.group, dev.mode);
 388
 389                 retval = add_perm_dev(&dev);
 390                 if (retval) {
 391                         dbg("add_perm_dev returned with error %d", retval);
 392                         goto exit;
 393                 }
 394         }
 395
 396 exit:
 397         fclose(fd);
 398         return retval;
 399 }
 400
 401 struct files {
 402         struct list_head list;
 403         char name[NAME_SIZE];
 404 };
 405
 406 /* sort files in lexical order */
 407 static int file_list_insert(char *filename)
 408 {
 409         struct files *loop_file;
 410         struct files *new_file;
 411
 412         list_for_each_entry(loop_file, &file_list, list) {
 413                 if (strcmp(loop_file->name, filename) > 0) {
 414                         break;
 415                 }
 416         }
 417
 418         new_file = malloc(sizeof(struct files));
 419         if (new_file == NULL) {
 420                 dbg("error malloc");
 421                 return -ENOMEM;
 422         }
 423
 424         strfieldcpy(new_file->name, filename);
 425         list_add_tail(&new_file->list, &loop_file->list);
 426         return 0;
 427 }
 428
 429 /* calls function for file or every file found in directory */
 430 static int call_foreach_file(int parser (char *f) , char *filename, char *extension)
 431 {
 432         struct dirent *ent;
 433         DIR *dir;
 434         char *ext;
 435         char file[NAME_SIZE];
 436         struct stat stats;
 437         struct files *loop_file;
 438         struct files *tmp_file;
 439
 440         /* look if we have a plain file or a directory to scan */
 441         stat(filename, &stats);
 442         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 443                 return parser(filename);
 444
 445         /* sort matching filename into list */
 446         dbg("open config as directory '%s'", filename);
 447         dir = opendir(filename);
 448         while (1) {
 449                 ent = readdir(dir);
 450                 if (ent == NULL || ent->d_name[0] == '\0')
 451                         break;
 452
 453                 dbg("found file '%s'", ent->d_name);
 454                 ext = strrchr(ent->d_name, '.');
 455                 if (ext == NULL)
 456                         continue;
 457
 458                 if (strcmp(ext, extension) == 0) {
 459                         dbg("put file in list '%s'", ent->d_name);
 460                         file_list_insert(ent->d_name);
 461                 }
 462         }
 463
 464         /* parse every file in the list */
 465         list_for_each_entry_safe(loop_file, tmp_file, &file_list, list) {
 466                 strfieldcpy(file, filename);
 467                 strfieldcat(file, loop_file->name);
 468                 parser(file);
 469                 list_del(&loop_file->list);
 470                 free(loop_file);
 471         }
 472
 473         closedir(dir);
 474         return 0;
 475 }
 476
 477 int namedev_init_rules()
 478 {
 479         return call_foreach_file(namedev_parse_rules, udev_rules_filename, RULEFILE_EXT);
 480 }
 481
 482 int namedev_init_permissions()
 483 {
 484         return call_foreach_file(namedev_parse_permissions, udev_permissions_filename, PERMFILE_EXT);
 485 }