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