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 <ctype.h>
  34 #include <unistd.h>
  35 #include <sys/stat.h>
  36 #include <dirent.h>
  37 #include <errno.h>
  38
  39 #include "udev.h"
  40 #include "udev_lib.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         char *buf;
 157         size_t bufsize;
 158         size_t cur;
 159         size_t count;
 160         int program_given = 0;
 161         int retval = 0;
 162         struct config_device dev;
 163
 164         if (file_map(filename, &buf, &bufsize) == 0) {
 165                 dbg("reading '%s' as rules file", filename);
 166         } else {
 167                 dbg("can't open '%s' as rules file", filename);
 168                 return -1;
 169         }
 170
 171         /* loop through the whole file */
 172         cur = 0;
 173         lineno = 0;
 174         while (1) {
 175                 count = buf_get_line(buf, bufsize, cur);
 176
 177                 strncpy(line, buf + cur, count);
 178                 line[count] = '\0';
 179                 temp = line;
 180                 lineno++;
 181
 182                 cur += count+1;
 183                 if (cur > bufsize)
 184                         break;
 185
 186                 dbg_parse("read '%s'", temp);
 187
 188                 /* eat the whitespace */
 189                 while (isspace(*temp))
 190                         ++temp;
 191
 192                 /* empty line? */
 193                 if ((*temp == '\0') || (*temp == '\n'))
 194                         continue;
 195
 196                 /* see if this is a comment */
 197                 if (*temp == COMMENT_CHARACTER)
 198                         continue;
 199
 200                 memset(&dev, 0x00, sizeof(struct config_device));
 201
 202                 /* get all known keys */
 203                 while (1) {
 204                         retval = parse_get_pair(&temp, &temp2, &temp3);
 205                         if (retval)
 206                                 break;
 207
 208                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 209                                 strfieldcpy(dev.bus, temp3);
 210                                 continue;
 211                         }
 212
 213                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 214                                 strfieldcpy(dev.id, temp3);
 215                                 continue;
 216                         }
 217
 218                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 219                                 strfieldcpy(dev.place, temp3);
 220                                 continue;
 221                         }
 222
 223                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 224                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 225                                 int sysfs_pair_num = 0;
 226
 227                                 /* find first unused pair */
 228                                 while (pair->file[0] != '\0') {
 229                                         ++sysfs_pair_num;
 230                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 231                                                 pair = NULL;
 232                                                 break;
 233                                         }
 234                                         ++pair;
 235                                 }
 236                                 if (pair) {
 237                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 238                                         if (attr == NULL) {
 239                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 240                                                 continue;
 241                                         }
 242                                         strfieldcpy(pair->file, attr);
 243                                         strfieldcpy(pair->value, temp3);
 244                                 }
 245                                 continue;
 246                         }
 247
 248                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 249                                 strfieldcpy(dev.kernel, temp3);
 250                                 continue;
 251                         }
 252
 253                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 254                                 program_given = 1;
 255                                 strfieldcpy(dev.program, temp3);
 256                                 continue;
 257                         }
 258
 259                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 260                                 strfieldcpy(dev.result, temp3);
 261                                 continue;
 262                         }
 263
 264                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 265                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 266                                 if (attr != NULL)
 267                                         if (strcasecmp(attr, ATTR_PARTITIONS) == 0) {
 268                                                 dbg_parse("creation of partition nodes requested");
 269                                                 dev.partitions = PARTITIONS_COUNT;
 270                                         }
 271                                 strfieldcpy(dev.name, temp3);
 272                                 continue;
 273                         }
 274
 275                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 276                                 strfieldcpy(dev.symlink, temp3);
 277                                 continue;
 278                         }
 279
 280                         if (strcasecmp(temp2, FIELD_OWNER) == 0) {
 281                                 strfieldcpy(dev.owner, temp3);
 282                                 continue;
 283                         }
 284
 285                         if (strcasecmp(temp2, FIELD_GROUP) == 0) {
 286                                 strfieldcpy(dev.group, temp3);
 287                                 continue;
 288                         }
 289
 290                         if (strcasecmp(temp2, FIELD_MODE) == 0) {
 291                                 dev.mode = strtol(temp3, NULL, 8);
 292                                 continue;
 293                         }
 294
 295                         dbg("unknown type of field '%s'", temp2);
 296                         goto error;
 297                 }
 298
 299                 /* simple plausibility checks for given keys */
 300                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 301                     (dev.sysfs_pair[0].value[0] == '\0')) {
 302                         dbg("inconsistency in " FIELD_SYSFS " key");
 303                         goto error;
 304                 }
 305
 306                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 307                         dbg(FIELD_RESULT " is only useful when "
 308                             FIELD_PROGRAM " is called in any rule before");
 309                         goto error;
 310                 }
 311
 312                 dev.config_line = lineno;
 313                 strfieldcpy(dev.config_file, filename);
 314                 retval = add_config_dev(&dev);
 315                 if (retval) {
 316                         dbg("add_config_dev returned with error %d", retval);
 317                         continue;
 318 error:
 319                         dbg("%s:%d:%d: parse error, rule skipped",
 320                             filename, lineno, temp - line);
 321                 }
 322         }
 323
 324         file_unmap(buf, bufsize);
 325         return retval;
 326 }
 327
 328 static int namedev_parse_permissions(char *filename)
 329 {
 330         char line[255];
 331         char *temp;
 332         char *temp2;
 333         char *buf;
 334         size_t bufsize;
 335         size_t cur;
 336         size_t count;
 337         int retval = 0;
 338         struct perm_device dev;
 339
 340         if (file_map(filename, &buf, &bufsize) == 0) {
 341                 dbg("reading '%s' as permissions file", filename);
 342         } else {
 343                 dbg("can't open '%s' as permissions file", filename);
 344                 return -1;
 345         }
 346
 347         /* loop through the whole file */
 348         cur = 0;
 349         while (1) {
 350                 count = buf_get_line(buf, bufsize, cur);
 351
 352                 strncpy(line, buf + cur, count);
 353                 line[count] = '\0';
 354                 temp = line;
 355
 356                 cur += count+1;
 357                 if (cur > bufsize)
 358                         break;
 359
 360                 dbg_parse("read '%s'", temp);
 361
 362                 /* eat the whitespace at the beginning of the line */
 363                 while (isspace(*temp))
 364                         ++temp;
 365
 366                 /* empty line? */
 367                 if ((*temp == '\0') || (*temp == '\n'))
 368                         continue;
 369
 370                 /* see if this is a comment */
 371                 if (*temp == COMMENT_CHARACTER)
 372                         continue;
 373
 374                 memset(&dev, 0x00, sizeof(dev));
 375
 376                 /* parse the line */
 377                 temp2 = strsep(&temp, ":");
 378                 if (!temp2) {
 379                         dbg("cannot parse line '%s'", line);
 380                         continue;
 381                 }
 382                 strfieldcpy(dev.name, temp2);
 383
 384                 temp2 = strsep(&temp, ":");
 385                 if (!temp2) {
 386                         dbg("cannot parse line '%s'", line);
 387                         continue;
 388                 }
 389                 strfieldcpy(dev.owner, temp2);
 390
 391                 temp2 = strsep(&temp, ":");
 392                 if (!temp2) {
 393                         dbg("cannot parse line '%s'", line);
 394                         continue;
 395                 }
 396                 strfieldcpy(dev.group, temp2);
 397
 398                 if (!temp) {
 399                         dbg("cannot parse line '%s'", line);
 400                         continue;
 401                 }
 402                 dev.mode = strtol(temp, NULL, 8);
 403
 404                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 405                           dev.name, dev.owner, dev.group, dev.mode);
 406
 407                 retval = add_perm_dev(&dev);
 408                 if (retval) {
 409                         dbg("add_perm_dev returned with error %d", retval);
 410                         goto exit;
 411                 }
 412         }
 413
 414 exit:
 415         file_unmap(buf, bufsize);
 416         return retval;
 417 }
 418
 419 struct files {
 420         struct list_head list;
 421         char name[NAME_SIZE];
 422 };
 423
 424 /* sort files in lexical order */
 425 static int file_list_insert(char *filename)
 426 {
 427         struct files *loop_file;
 428         struct files *new_file;
 429
 430         list_for_each_entry(loop_file, &file_list, list) {
 431                 if (strcmp(loop_file->name, filename) > 0) {
 432                         break;
 433                 }
 434         }
 435
 436         new_file = malloc(sizeof(struct files));
 437         if (new_file == NULL) {
 438                 dbg("error malloc");
 439                 return -ENOMEM;
 440         }
 441
 442         strfieldcpy(new_file->name, filename);
 443         list_add_tail(&new_file->list, &loop_file->list);
 444         return 0;
 445 }
 446
 447 /* calls function for file or every file found in directory */
 448 static int call_foreach_file(int parser (char *f) , char *filename, char *extension)
 449 {
 450         struct dirent *ent;
 451         DIR *dir;
 452         char *ext;
 453         char file[NAME_SIZE];
 454         struct stat stats;
 455         struct files *loop_file;
 456         struct files *tmp_file;
 457
 458         /* look if we have a plain file or a directory to scan */
 459         stat(filename, &stats);
 460         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 461                 return parser(filename);
 462
 463         /* sort matching filename into list */
 464         dbg("open config as directory '%s'", filename);
 465         dir = opendir(filename);
 466         while (1) {
 467                 ent = readdir(dir);
 468                 if (ent == NULL || ent->d_name[0] == '\0')
 469                         break;
 470
 471                 dbg("found file '%s'", ent->d_name);
 472                 ext = strrchr(ent->d_name, '.');
 473                 if (ext == NULL)
 474                         continue;
 475
 476                 if (strcmp(ext, extension) == 0) {
 477                         dbg("put file in list '%s'", ent->d_name);
 478                         file_list_insert(ent->d_name);
 479                 }
 480         }
 481
 482         /* parse every file in the list */
 483         list_for_each_entry_safe(loop_file, tmp_file, &file_list, list) {
 484                 strfieldcpy(file, filename);
 485                 strfieldcat(file, loop_file->name);
 486                 parser(file);
 487                 list_del(&loop_file->list);
 488                 free(loop_file);
 489         }
 490
 491         closedir(dir);
 492         return 0;
 493 }
 494
 495 int namedev_init_rules()
 496 {
 497         return call_foreach_file(namedev_parse_rules, udev_rules_filename, RULEFILE_EXT);
 498 }
 499
 500 int namedev_init_permissions()
 501 {
 502         return call_foreach_file(namedev_parse_permissions, udev_permissions_filename, PERMFILE_EXT);
 503 }