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} or 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         attr = strchr(str, '_');
 136         if (attr != NULL) {
 137                 attr++;
 138                 dbg("attribute='%s'", attr);
 139                 return attr;
 140         }
 141
 142         return NULL;
 143 }
 144
 145 static int namedev_parse_rules(char *filename)
 146 {
 147         char line[LINE_SIZE];
 148         char *bufline;
 149         int lineno;
 150         char *temp;
 151         char *temp2;
 152         char *temp3;
 153         char *attr;
 154         char *buf;
 155         size_t bufsize;
 156         size_t cur;
 157         size_t count;
 158         int program_given = 0;
 159         int valid;
 160         int retval = 0;
 161         struct config_device dev;
 162
 163         if (file_map(filename, &buf, &bufsize) == 0) {
 164                 dbg("reading '%s' as rules file", filename);
 165         } else {
 166                 dbg("can't open '%s' as rules file", filename);
 167                 return -1;
 168         }
 169
 170         /* loop through the whole file */
 171         cur = 0;
 172         lineno = 0;
 173         while (cur < bufsize) {
 174                 count = buf_get_line(buf, bufsize, cur);
 175                 bufline = &buf[cur];
 176                 cur += count+1;
 177                 lineno++;
 178
 179                 if (count >= LINE_SIZE) {
 180                         info("line too long, rule skipped %s, line %d",
 181                              filename, lineno);
 182                         continue;
 183                 }
 184
 185                 /* eat the whitespace */
 186                 while ((count > 0) && isspace(bufline[0])) {
 187                         bufline++;
 188                         count--;
 189                 }
 190                 if (count == 0)
 191                         continue;
 192
 193                 /* see if this is a comment */
 194                 if (bufline[0] == COMMENT_CHARACTER)
 195                         continue;
 196
 197                 strncpy(line, bufline, count);
 198                 line[count] = '\0';
 199                 dbg_parse("read '%s'", line);
 200
 201                 /* get all known keys */
 202                 memset(&dev, 0x00, sizeof(struct config_device));
 203                 temp = line;
 204                 valid = 0;
 205
 206                 while (1) {
 207                         retval = parse_get_pair(&temp, &temp2, &temp3);
 208                         if (retval)
 209                                 break;
 210
 211                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 212                                 strfieldcpy(dev.bus, temp3);
 213                                 valid = 1;
 214                                 continue;
 215                         }
 216
 217                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 218                                 strfieldcpy(dev.id, temp3);
 219                                 valid = 1;
 220                                 continue;
 221                         }
 222
 223                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 224                                 strfieldcpy(dev.place, temp3);
 225                                 valid = 1;
 226                                 continue;
 227                         }
 228
 229                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 230                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 231                                 int sysfs_pair_num = 0;
 232
 233                                 /* find first unused pair */
 234                                 while (pair->file[0] != '\0') {
 235                                         ++sysfs_pair_num;
 236                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 237                                                 pair = NULL;
 238                                                 break;
 239                                         }
 240                                         ++pair;
 241                                 }
 242                                 if (pair) {
 243                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 244                                         if (attr == NULL) {
 245                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 246                                                 continue;
 247                                         }
 248                                         strfieldcpy(pair->file, attr);
 249                                         strfieldcpy(pair->value, temp3);
 250                                         valid = 1;
 251                                 }
 252                                 continue;
 253                         }
 254
 255                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 256                                 strfieldcpy(dev.kernel, temp3);
 257                                 valid = 1;
 258                                 continue;
 259                         }
 260
 261                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 262                                 program_given = 1;
 263                                 strfieldcpy(dev.program, temp3);
 264                                 valid = 1;
 265                                 continue;
 266                         }
 267
 268                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 269                                 strfieldcpy(dev.result, temp3);
 270                                 valid = 1;
 271                                 continue;
 272                         }
 273
 274                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 275                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 276                                 if (attr != NULL && strcasecmp(attr, ATTR_PARTITIONS) == 0) {
 277                                                 dbg_parse("creation of partition nodes requested");
 278                                                 dev.partitions = PARTITIONS_COUNT;
 279                                         }
 280                                 strfieldcpy(dev.name, temp3);
 281                                 valid = 1;
 282                                 continue;
 283                         }
 284
 285                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 286                                 strfieldcpy(dev.symlink, temp3);
 287                                 valid = 1;
 288                                 continue;
 289                         }
 290
 291                         if (strcasecmp(temp2, FIELD_OWNER) == 0) {
 292                                 strfieldcpy(dev.owner, temp3);
 293                                 valid = 1;
 294                                 continue;
 295                         }
 296
 297                         if (strcasecmp(temp2, FIELD_GROUP) == 0) {
 298                                 strfieldcpy(dev.group, temp3);
 299                                 valid = 1;
 300                                 continue;
 301                         }
 302
 303                         if (strcasecmp(temp2, FIELD_MODE) == 0) {
 304                                 dev.mode = strtol(temp3, NULL, 8);
 305                                 valid = 1;
 306                                 continue;
 307                         }
 308
 309                         dbg("unknown type of field '%s'", temp2);
 310                         goto error;
 311                 }
 312
 313                 /* skip line if not any valid key was found */
 314                 if (!valid)
 315                         goto error;
 316
 317                 /* simple plausibility checks for given keys */
 318                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 319                     (dev.sysfs_pair[0].value[0] == '\0')) {
 320                         info("inconsistency in " FIELD_SYSFS " key");
 321                         goto error;
 322                 }
 323
 324                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 325                         info(FIELD_RESULT " is only useful when "
 326                              FIELD_PROGRAM " is called in any rule before");
 327                         goto error;
 328                 }
 329
 330                 dev.config_line = lineno;
 331                 strfieldcpy(dev.config_file, filename);
 332                 retval = add_config_dev(&dev);
 333                 if (retval) {
 334                         dbg("add_config_dev returned with error %d", retval);
 335                         continue;
 336 error:
 337                         info("parse error %s, line %d:%d, rule skipped",
 338                              filename, lineno, temp - line);
 339                 }
 340         }
 341
 342         file_unmap(buf, bufsize);
 343         return retval;
 344 }
 345
 346 static int namedev_parse_permissions(char *filename)
 347 {
 348         char line[LINE_SIZE];
 349         char *bufline;
 350         char *temp;
 351         char *temp2;
 352         char *buf;
 353         size_t bufsize;
 354         size_t cur;
 355         size_t count;
 356         int retval = 0;
 357         struct perm_device dev;
 358         int lineno;
 359
 360         if (file_map(filename, &buf, &bufsize) == 0) {
 361                 dbg("reading '%s' as permissions file", filename);
 362         } else {
 363                 dbg("can't open '%s' as permissions file", filename);
 364                 return -1;
 365         }
 366
 367         /* loop through the whole file */
 368         cur = 0;
 369         lineno = 0;
 370         while (cur < bufsize) {
 371                 count = buf_get_line(buf, bufsize, cur);
 372                 bufline = &buf[cur];
 373                 cur += count+1;
 374                 lineno++;
 375
 376                 if (count >= LINE_SIZE) {
 377                         info("line too long, rule skipped %s, line %d",
 378                              filename, lineno);
 379                         continue;
 380                 }
 381
 382                 /* eat the whitespace */
 383                 while ((count > 0) && isspace(bufline[0])) {
 384                         bufline++;
 385                         count--;
 386                 }
 387                 if (count == 0)
 388                         continue;
 389
 390                 /* see if this is a comment */
 391                 if (bufline[0] == COMMENT_CHARACTER)
 392                         continue;
 393
 394                 strncpy(line, bufline, count);
 395                 line[count] = '\0';
 396                 dbg_parse("read '%s'", line);
 397
 398                 /* parse the line */
 399                 memset(&dev, 0x00, sizeof(struct perm_device));
 400                 temp = line;
 401
 402                 temp2 = strsep(&temp, ":");
 403                 if (!temp2) {
 404                         dbg("cannot parse line '%s'", line);
 405                         continue;
 406                 }
 407                 strfieldcpy(dev.name, temp2);
 408
 409                 temp2 = strsep(&temp, ":");
 410                 if (!temp2) {
 411                         dbg("cannot parse line '%s'", line);
 412                         continue;
 413                 }
 414                 strfieldcpy(dev.owner, temp2);
 415
 416                 temp2 = strsep(&temp, ":");
 417                 if (!temp2) {
 418                         dbg("cannot parse line '%s'", line);
 419                         continue;
 420                 }
 421                 strfieldcpy(dev.group, temp2);
 422
 423                 if (!temp) {
 424                         dbg("cannot parse line '%s'", line);
 425                         continue;
 426                 }
 427                 dev.mode = strtol(temp, NULL, 8);
 428
 429                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 430                           dev.name, dev.owner, dev.group, dev.mode);
 431
 432                 retval = add_perm_dev(&dev);
 433                 if (retval) {
 434                         dbg("add_perm_dev returned with error %d", retval);
 435                         goto exit;
 436                 }
 437         }
 438
 439 exit:
 440         file_unmap(buf, bufsize);
 441         return retval;
 442 }
 443
 444 int namedev_init_rules()
 445 {
 446         struct stat stats;
 447
 448         stat(udev_rules_filename, &stats);
 449         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 450                 return namedev_parse_rules(udev_rules_filename);
 451         else
 452                 return call_foreach_file(namedev_parse_rules,
 453                                          udev_rules_filename, RULEFILE_SUFFIX);
 454 }
 455
 456 int namedev_init_permissions()
 457 {
 458         struct stat stats;
 459
 460         stat(udev_permissions_filename, &stats);
 461         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 462                 return namedev_parse_permissions(udev_permissions_filename);
 463         else
 464                 return call_foreach_file(namedev_parse_permissions,
 465                                          udev_permissions_filename, PERMFILE_SUFFIX);
 466 }