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_utils.h"
  40 #include "logging.h"
  41 #include "namedev.h"
  42
  43 LIST_HEAD(config_device_list);
  44
  45 static int add_config_dev(struct config_device *new_dev)
  46 {
  47         struct config_device *tmp_dev;
  48
  49         tmp_dev = malloc(sizeof(*tmp_dev));
  50         if (tmp_dev == NULL)
  51                 return -ENOMEM;
  52         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  53         list_add_tail(&tmp_dev->node, &config_device_list);
  54         //dump_config_dev(tmp_dev);
  55         return 0;
  56 }
  57
  58 void dump_config_dev(struct config_device *dev)
  59 {
  60         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  61                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  62                   "kernel='%s', program='%s', result='%s'"
  63                   "owner='%s', group='%s', mode=%#o",
  64                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  65                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  66                   dev->kernel, dev->program, dev->result,
  67                   dev->owner, dev->group, dev->mode);
  68 }
  69
  70 void dump_config_dev_list(void)
  71 {
  72         struct config_device *dev;
  73
  74         list_for_each_entry(dev, &config_device_list, node)
  75                 dump_config_dev(dev);
  76 }
  77
  78 /* extract possible KEY{attr} */
  79 static char *get_key_attribute(char *str)
  80 {
  81         char *pos;
  82         char *attr;
  83
  84         attr = strchr(str, '{');
  85         if (attr != NULL) {
  86                 attr++;
  87                 pos = strchr(attr, '}');
  88                 if (pos == NULL) {
  89                         dbg("missing closing brace for format");
  90                         return NULL;
  91                 }
  92                 pos[0] = '\0';
  93                 dbg("attribute='%s'", attr);
  94                 return attr;
  95         }
  96
  97         return NULL;
  98 }
  99
 100 static int namedev_parse(const char *filename, void *data)
 101 {
 102         char line[LINE_SIZE];
 103         char *bufline;
 104         int lineno;
 105         char *temp;
 106         char *temp2;
 107         char *temp3;
 108         char *attr;
 109         char *buf;
 110         size_t bufsize;
 111         size_t cur;
 112         size_t count;
 113         int program_given = 0;
 114         int valid;
 115         int retval = 0;
 116         struct config_device dev;
 117
 118         if (file_map(filename, &buf, &bufsize) == 0) {
 119                 dbg("reading '%s' as rules file", filename);
 120         } else {
 121                 dbg("can't open '%s' as rules file", filename);
 122                 return -1;
 123         }
 124
 125         /* loop through the whole file */
 126         cur = 0;
 127         lineno = 0;
 128         while (cur < bufsize) {
 129                 int i, j;
 130
 131                 count = buf_get_line(buf, bufsize, cur);
 132                 bufline = &buf[cur];
 133                 cur += count+1;
 134                 lineno++;
 135
 136                 if (count >= LINE_SIZE) {
 137                         info("line too long, rule skipped %s, line %d", filename, lineno);
 138                         continue;
 139                 }
 140
 141                 /* eat the whitespace */
 142                 while ((count > 0) && isspace(bufline[0])) {
 143                         bufline++;
 144                         count--;
 145                 }
 146                 if (count == 0)
 147                         continue;
 148
 149                 /* see if this is a comment */
 150                 if (bufline[0] == COMMENT_CHARACTER)
 151                         continue;
 152
 153                 /* skip backslash and newline from multi line rules */
 154                 for (i = j = 0; i < count; i++) {
 155                         if (bufline[i] == '\\' || bufline[i] == '\n')
 156                                 continue;
 157
 158                         line[j++] = bufline[i];
 159                 }
 160                 line[j] = '\0';
 161                 dbg_parse("read '%s'", line);
 162
 163                 /* get all known keys */
 164                 memset(&dev, 0x00, sizeof(struct config_device));
 165                 temp = line;
 166                 valid = 0;
 167
 168                 while (1) {
 169                         retval = parse_get_pair(&temp, &temp2, &temp3);
 170                         if (retval)
 171                                 break;
 172
 173                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 174                                 strfieldcpy(dev.bus, temp3);
 175                                 valid = 1;
 176                                 continue;
 177                         }
 178
 179                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 180                                 strfieldcpy(dev.id, temp3);
 181                                 valid = 1;
 182                                 continue;
 183                         }
 184
 185                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 186                                 strfieldcpy(dev.place, temp3);
 187                                 valid = 1;
 188                                 continue;
 189                         }
 190
 191                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 192                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 193                                 int sysfs_pair_num = 0;
 194
 195                                 /* find first unused pair */
 196                                 while (pair->file[0] != '\0') {
 197                                         ++sysfs_pair_num;
 198                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 199                                                 pair = NULL;
 200                                                 break;
 201                                         }
 202                                         ++pair;
 203                                 }
 204                                 if (pair) {
 205                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 206                                         if (attr == NULL) {
 207                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 208                                                 continue;
 209                                         }
 210                                         strfieldcpy(pair->file, attr);
 211                                         strfieldcpy(pair->value, temp3);
 212                                         valid = 1;
 213                                 }
 214                                 continue;
 215                         }
 216
 217                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 218                                 strfieldcpy(dev.kernel, temp3);
 219                                 valid = 1;
 220                                 continue;
 221                         }
 222
 223                         if (strcasecmp(temp2, FIELD_SUBSYSTEM) == 0) {
 224                                 strfieldcpy(dev.subsystem, temp3);
 225                                 valid = 1;
 226                                 continue;
 227                         }
 228
 229                         if (strcasecmp(temp2, FIELD_DRIVER) == 0) {
 230                                 strfieldcpy(dev.driver, temp3);
 231                                 valid = 1;
 232                                 continue;
 233                         }
 234
 235                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 236                                 program_given = 1;
 237                                 strfieldcpy(dev.program, temp3);
 238                                 valid = 1;
 239                                 continue;
 240                         }
 241
 242                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 243                                 strfieldcpy(dev.result, temp3);
 244                                 valid = 1;
 245                                 continue;
 246                         }
 247
 248                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 249                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 250                                 if (attr != NULL) {
 251                                         if (strstr(attr, ATTR_PARTITIONS) != NULL) {
 252                                                 dbg_parse("creation of partition nodes requested");
 253                                                 dev.partitions = PARTITIONS_COUNT;
 254                                         }
 255                                         if (strstr(attr, ATTR_IGNORE_REMOVE) != NULL) {
 256                                                 dbg_parse("remove event should be ignored");
 257                                                 dev.ignore_remove = 1;
 258                                         }
 259                                 }
 260                                 strfieldcpy(dev.name, temp3);
 261                                 valid = 1;
 262                                 continue;
 263                         }
 264
 265                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 266                                 strfieldcpy(dev.symlink, temp3);
 267                                 valid = 1;
 268                                 continue;
 269                         }
 270
 271                         if (strcasecmp(temp2, FIELD_OWNER) == 0) {
 272                                 strfieldcpy(dev.owner, temp3);
 273                                 valid = 1;
 274                                 continue;
 275                         }
 276
 277                         if (strcasecmp(temp2, FIELD_GROUP) == 0) {
 278                                 strfieldcpy(dev.group, temp3);
 279                                 valid = 1;
 280                                 continue;
 281                         }
 282
 283                         if (strcasecmp(temp2, FIELD_MODE) == 0) {
 284                                 dev.mode = strtol(temp3, NULL, 8);
 285                                 valid = 1;
 286                                 continue;
 287                         }
 288
 289                         dbg("unknown type of field '%s'", temp2);
 290                         goto error;
 291                 }
 292
 293                 /* skip line if not any valid key was found */
 294                 if (!valid)
 295                         goto error;
 296
 297                 /* simple plausibility checks for given keys */
 298                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 299                     (dev.sysfs_pair[0].value[0] == '\0')) {
 300                         info("inconsistency in " FIELD_SYSFS " key");
 301                         goto error;
 302                 }
 303
 304                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 305                         info(FIELD_RESULT " is only useful when "
 306                              FIELD_PROGRAM " is called in any rule before");
 307                         goto error;
 308                 }
 309
 310                 dev.config_line = lineno;
 311                 strfieldcpy(dev.config_file, filename);
 312                 retval = add_config_dev(&dev);
 313                 if (retval) {
 314                         dbg("add_config_dev returned with error %d", retval);
 315                         continue;
 316 error:
 317                         info("parse error %s, line %d:%d, rule skipped",
 318                              filename, lineno, temp - line);
 319                 }
 320         }
 321
 322         file_unmap(buf, bufsize);
 323         return retval;
 324 }
 325
 326 int namedev_init(void)
 327 {
 328         struct stat stats;
 329         int retval;
 330
 331         if (stat(udev_rules_filename, &stats) != 0)
 332                 return -1;
 333
 334         if ((stats.st_mode & S_IFMT) != S_IFDIR)
 335                 retval = namedev_parse(udev_rules_filename, NULL);
 336         else
 337                 retval = call_foreach_file(namedev_parse, udev_rules_filename, RULEFILE_SUFFIX, NULL);
 338
 339         return retval;
 340 }