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 <errno.h>
  37
  38 #include "udev.h"
  39 #include "udev_lib.h"
  40 #include "logging.h"
  41 #include "namedev.h"
  42
  43
  44 static int add_config_dev(struct config_device *new_dev)
  45 {
  46         struct config_device *tmp_dev;
  47
  48         tmp_dev = malloc(sizeof(*tmp_dev));
  49         if (tmp_dev == NULL)
  50                 return -ENOMEM;
  51         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  52         list_add_tail(&tmp_dev->node, &config_device_list);
  53         //dump_config_dev(tmp_dev);
  54         return 0;
  55 }
  56
  57 void dump_config_dev(struct config_device *dev)
  58 {
  59         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  60                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  61                   "kernel='%s', program='%s', result='%s'"
  62                   "owner='%s', group='%s', mode=%#o",
  63                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  64                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  65                   dev->kernel, dev->program, dev->result,
  66                   dev->owner, dev->group, dev->mode);
  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 static int add_perm_dev(struct perm_device *new_dev)
  78 {
  79         struct perm_device *dev;
  80         struct perm_device *tmp_dev;
  81
  82         /* update the values if we already have the device */
  83         list_for_each_entry(dev, &perm_device_list, node) {
  84                 if (strcmp(new_dev->name, dev->name) != 0)
  85                         continue;
  86
  87                 set_empty_perms(dev, new_dev->mode, new_dev->owner, new_dev->group);
  88                 return 0;
  89         }
  90
  91         /* not found, add new structure to the perm list */
  92         tmp_dev = malloc(sizeof(*tmp_dev));
  93         if (!tmp_dev)
  94                 return -ENOMEM;
  95
  96         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  97         list_add_tail(&tmp_dev->node, &perm_device_list);
  98         //dump_perm_dev(tmp_dev);
  99         return 0;
 100 }
 101
 102 void dump_perm_dev(struct perm_device *dev)
 103 {
 104         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 105                   dev->name, dev->owner, dev->group, dev->mode);
 106 }
 107
 108 void dump_perm_dev_list(void)
 109 {
 110         struct perm_device *dev;
 111
 112         list_for_each_entry(dev, &perm_device_list, node)
 113                 dump_perm_dev(dev);
 114 }
 115
 116 /* extract possible KEY{attr} */
 117 static char *get_key_attribute(char *str)
 118 {
 119         char *pos;
 120         char *attr;
 121
 122         attr = strchr(str, '{');
 123         if (attr != NULL) {
 124                 attr++;
 125                 pos = strchr(attr, '}');
 126                 if (pos == NULL) {
 127                         dbg("missing closing brace for format");
 128                         return NULL;
 129                 }
 130                 pos[0] = '\0';
 131                 dbg("attribute='%s'", attr);
 132                 return attr;
 133         }
 134
 135         return NULL;
 136 }
 137
 138 static int namedev_parse_rules(const char *filename, void *data)
 139 {
 140         char line[LINE_SIZE];
 141         char *bufline;
 142         int lineno;
 143         char *temp;
 144         char *temp2;
 145         char *temp3;
 146         char *attr;
 147         char *buf;
 148         size_t bufsize;
 149         size_t cur;
 150         size_t count;
 151         int program_given = 0;
 152         int valid;
 153         int retval = 0;
 154         struct config_device dev;
 155
 156         if (file_map(filename, &buf, &bufsize) == 0) {
 157                 dbg("reading '%s' as rules file", filename);
 158         } else {
 159                 dbg("can't open '%s' as rules file", filename);
 160                 return -1;
 161         }
 162
 163         /* loop through the whole file */
 164         cur = 0;
 165         lineno = 0;
 166         while (cur < bufsize) {
 167                 count = buf_get_line(buf, bufsize, cur);
 168                 bufline = &buf[cur];
 169                 cur += count+1;
 170                 lineno++;
 171
 172                 if (count >= LINE_SIZE) {
 173                         info("line too long, rule skipped %s, line %d",
 174                              filename, lineno);
 175                         continue;
 176                 }
 177
 178                 /* eat the whitespace */
 179                 while ((count > 0) && isspace(bufline[0])) {
 180                         bufline++;
 181                         count--;
 182                 }
 183                 if (count == 0)
 184                         continue;
 185
 186                 /* see if this is a comment */
 187                 if (bufline[0] == COMMENT_CHARACTER)
 188                         continue;
 189
 190                 strncpy(line, bufline, count);
 191                 line[count] = '\0';
 192                 dbg_parse("read '%s'", line);
 193
 194                 /* get all known keys */
 195                 memset(&dev, 0x00, sizeof(struct config_device));
 196                 temp = line;
 197                 valid = 0;
 198
 199                 while (1) {
 200                         retval = parse_get_pair(&temp, &temp2, &temp3);
 201                         if (retval)
 202                                 break;
 203
 204                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 205                                 strfieldcpy(dev.bus, temp3);
 206                                 valid = 1;
 207                                 continue;
 208                         }
 209
 210                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 211                                 strfieldcpy(dev.id, temp3);
 212                                 valid = 1;
 213                                 continue;
 214                         }
 215
 216                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 217                                 strfieldcpy(dev.place, temp3);
 218                                 valid = 1;
 219                                 continue;
 220                         }
 221
 222                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 223                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 224                                 int sysfs_pair_num = 0;
 225
 226                                 /* find first unused pair */
 227                                 while (pair->file[0] != '\0') {
 228                                         ++sysfs_pair_num;
 229                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 230                                                 pair = NULL;
 231                                                 break;
 232                                         }
 233                                         ++pair;
 234                                 }
 235                                 if (pair) {
 236                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 237                                         if (attr == NULL) {
 238                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 239                                                 continue;
 240                                         }
 241                                         strfieldcpy(pair->file, attr);
 242                                         strfieldcpy(pair->value, temp3);
 243                                         valid = 1;
 244                                 }
 245                                 continue;
 246                         }
 247
 248                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 249                                 strfieldcpy(dev.kernel, temp3);
 250                                 valid = 1;
 251                                 continue;
 252                         }
 253
 254                         if (strcasecmp(temp2, FIELD_SUBSYSTEM) == 0) {
 255                                 strfieldcpy(dev.subsystem, temp3);
 256                                 valid = 1;
 257                                 continue;
 258                         }
 259
 260                         if (strcasecmp(temp2, FIELD_DRIVER) == 0) {
 261                                 strfieldcpy(dev.driver, temp3);
 262                                 valid = 1;
 263                                 continue;
 264                         }
 265
 266                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 267                                 program_given = 1;
 268                                 strfieldcpy(dev.program, temp3);
 269                                 valid = 1;
 270                                 continue;
 271                         }
 272
 273                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 274                                 strfieldcpy(dev.result, temp3);
 275                                 valid = 1;
 276                                 continue;
 277                         }
 278
 279                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 280                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 281                                 if (attr != NULL && strcasecmp(attr, ATTR_PARTITIONS) == 0) {
 282                                                 dbg_parse("creation of partition nodes requested");
 283                                                 dev.partitions = PARTITIONS_COUNT;
 284                                         }
 285                                 strfieldcpy(dev.name, temp3);
 286                                 valid = 1;
 287                                 continue;
 288                         }
 289
 290                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 291                                 strfieldcpy(dev.symlink, temp3);
 292                                 valid = 1;
 293                                 continue;
 294                         }
 295
 296                         if (strcasecmp(temp2, FIELD_OWNER) == 0) {
 297                                 strfieldcpy(dev.owner, temp3);
 298                                 valid = 1;
 299                                 continue;
 300                         }
 301
 302                         if (strcasecmp(temp2, FIELD_GROUP) == 0) {
 303                                 strfieldcpy(dev.group, temp3);
 304                                 valid = 1;
 305                                 continue;
 306                         }
 307
 308                         if (strcasecmp(temp2, FIELD_MODE) == 0) {
 309                                 dev.mode = strtol(temp3, NULL, 8);
 310                                 valid = 1;
 311                                 continue;
 312                         }
 313
 314                         dbg("unknown type of field '%s'", temp2);
 315                         goto error;
 316                 }
 317
 318                 /* skip line if not any valid key was found */
 319                 if (!valid)
 320                         goto error;
 321
 322                 /* simple plausibility checks for given keys */
 323                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 324                     (dev.sysfs_pair[0].value[0] == '\0')) {
 325                         info("inconsistency in " FIELD_SYSFS " key");
 326                         goto error;
 327                 }
 328
 329                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 330                         info(FIELD_RESULT " is only useful when "
 331                              FIELD_PROGRAM " is called in any rule before");
 332                         goto error;
 333                 }
 334
 335                 dev.config_line = lineno;
 336                 strfieldcpy(dev.config_file, filename);
 337                 retval = add_config_dev(&dev);
 338                 if (retval) {
 339                         dbg("add_config_dev returned with error %d", retval);
 340                         continue;
 341 error:
 342                         info("parse error %s, line %d:%d, rule skipped",
 343                              filename, lineno, temp - line);
 344                 }
 345         }
 346
 347         file_unmap(buf, bufsize);
 348         return retval;
 349 }
 350
 351 static int namedev_parse_permissions(const char *filename, void *data)
 352 {
 353         char line[LINE_SIZE];
 354         char *bufline;
 355         char *temp;
 356         char *temp2;
 357         char *buf;
 358         size_t bufsize;
 359         size_t cur;
 360         size_t count;
 361         int retval = 0;
 362         struct perm_device dev;
 363         int lineno;
 364
 365         if (file_map(filename, &buf, &bufsize) == 0) {
 366                 dbg("reading '%s' as permissions file", filename);
 367         } else {
 368                 dbg("can't open '%s' as permissions file", filename);
 369                 return -1;
 370         }
 371
 372         /* loop through the whole file */
 373         cur = 0;
 374         lineno = 0;
 375         while (cur < bufsize) {
 376                 count = buf_get_line(buf, bufsize, cur);
 377                 bufline = &buf[cur];
 378                 cur += count+1;
 379                 lineno++;
 380
 381                 if (count >= LINE_SIZE) {
 382                         info("line too long, rule skipped %s, line %d",
 383                              filename, lineno);
 384                         continue;
 385                 }
 386
 387                 /* eat the whitespace */
 388                 while ((count > 0) && isspace(bufline[0])) {
 389                         bufline++;
 390                         count--;
 391                 }
 392                 if (count == 0)
 393                         continue;
 394
 395                 /* see if this is a comment */
 396                 if (bufline[0] == COMMENT_CHARACTER)
 397                         continue;
 398
 399                 strncpy(line, bufline, count);
 400                 line[count] = '\0';
 401                 dbg_parse("read '%s'", line);
 402
 403                 /* parse the line */
 404                 memset(&dev, 0x00, sizeof(struct perm_device));
 405                 temp = line;
 406
 407                 temp2 = strsep(&temp, ":");
 408                 if (!temp2) {
 409                         dbg("cannot parse line '%s'", line);
 410                         continue;
 411                 }
 412                 strfieldcpy(dev.name, temp2);
 413
 414                 temp2 = strsep(&temp, ":");
 415                 if (!temp2) {
 416                         dbg("cannot parse line '%s'", line);
 417                         continue;
 418                 }
 419                 strfieldcpy(dev.owner, temp2);
 420
 421                 temp2 = strsep(&temp, ":");
 422                 if (!temp2) {
 423                         dbg("cannot parse line '%s'", line);
 424                         continue;
 425                 }
 426                 strfieldcpy(dev.group, temp2);
 427
 428                 if (!temp) {
 429                         dbg("cannot parse line '%s'", line);
 430                         continue;
 431                 }
 432                 dev.mode = strtol(temp, NULL, 8);
 433
 434                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 435                           dev.name, dev.owner, dev.group, dev.mode);
 436
 437                 retval = add_perm_dev(&dev);
 438                 if (retval) {
 439                         dbg("add_perm_dev returned with error %d", retval);
 440                         goto exit;
 441                 }
 442         }
 443
 444 exit:
 445         file_unmap(buf, bufsize);
 446         return retval;
 447 }
 448
 449 int namedev_init_rules(void)
 450 {
 451         struct stat stats;
 452
 453         stat(udev_rules_filename, &stats);
 454         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 455                 return namedev_parse_rules(udev_rules_filename, NULL);
 456         else
 457                 return call_foreach_file(namedev_parse_rules, udev_rules_filename,
 458                                          RULEFILE_SUFFIX, NULL);
 459 }
 460
 461 int namedev_init_permissions(void)
 462 {
 463         struct stat stats;
 464
 465         stat(udev_permissions_filename, &stats);
 466         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 467                 return namedev_parse_permissions(udev_permissions_filename, NULL);
 468         else
 469                 return call_foreach_file(namedev_parse_permissions, udev_permissions_filename,
 470                                          PERMFILE_SUFFIX, NULL);
 471 }