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 <fcntl.h>
  34 #include <ctype.h>
  35 #include <unistd.h>
  36 #include <errno.h>
  37
  38 #include "udev.h"
  39 #include "logging.h"
  40 #include "namedev.h"
  41
  42 static int add_config_dev(struct config_device *new_dev)
  43 {
  44         struct config_device *tmp_dev;
  45
  46         tmp_dev = malloc(sizeof(*tmp_dev));
  47         if (tmp_dev == NULL)
  48                 return -ENOMEM;
  49         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  50         list_add_tail(&tmp_dev->node, &config_device_list);
  51         //dump_config_dev(tmp_dev);
  52         return 0;
  53 }
  54
  55 void dump_config_dev(struct config_device *dev)
  56 {
  57         /*FIXME dump all sysfs's */
  58         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  59                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  60                   "kernel='%s', program='%s', result='%s'",
  61                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  62                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  63                   dev->kernel, dev->program, dev->result);
  64 }
  65
  66 void dump_config_dev_list(void)
  67 {
  68         struct config_device *dev;
  69
  70         list_for_each_entry(dev, &config_device_list, node)
  71                 dump_config_dev(dev);
  72 }
  73
  74 void dump_perm_dev(struct perm_device *dev)
  75 {
  76         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
  77                   dev->name, dev->owner, dev->group, dev->mode);
  78 }
  79
  80 void dump_perm_dev_list(void)
  81 {
  82         struct perm_device *dev;
  83
  84         list_for_each_entry(dev, &perm_device_list, node)
  85                 dump_perm_dev(dev);
  86 }
  87
  88 /* extract possible KEY{attr} or KEY_attr */
  89 static char *get_key_attribute(char *str)
  90 {
  91         char *pos;
  92         char *attr;
  93
  94         attr = strchr(str, '{');
  95         if (attr != NULL) {
  96                 attr++;
  97                 pos = strchr(attr, '}');
  98                 if (pos == NULL) {
  99                         dbg("missing closing brace for format");
 100                         return NULL;
 101                 }
 102                 pos[0] = '\0';
 103                 dbg("attribute='%s'", attr);
 104                 return attr;
 105         }
 106
 107         attr = strchr(str, '_');
 108         if (attr != NULL) {
 109                 attr++;
 110                 dbg("attribute='%s'", attr);
 111                 return attr;
 112         }
 113
 114         return NULL;
 115 }
 116
 117 int namedev_init_rules(void)
 118 {
 119         char line[255];
 120         int lineno;
 121         char *temp;
 122         char *temp2;
 123         char *temp3;
 124         char *attr;
 125         FILE *fd;
 126         int program_given = 0;
 127         int retval = 0;
 128         struct config_device dev;
 129
 130         fd = fopen(udev_rules_filename, "r");
 131         if (fd != NULL) {
 132                 dbg("reading '%s' as rules file", udev_rules_filename);
 133         } else {
 134                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 135                 return -ENODEV;
 136         }
 137
 138         /* loop through the whole file */
 139         lineno = 0;
 140         while (1) {
 141                 /* get a line */
 142                 temp = fgets(line, sizeof(line), fd);
 143                 if (temp == NULL)
 144                         goto exit;
 145                 lineno++;
 146                 dbg_parse("read '%s'", temp);
 147
 148                 /* eat the whitespace */
 149                 while (isspace(*temp))
 150                         ++temp;
 151
 152                 /* empty line? */
 153                 if ((*temp == '\0') || (*temp == '\n'))
 154                         continue;
 155
 156                 /* see if this is a comment */
 157                 if (*temp == COMMENT_CHARACTER)
 158                         continue;
 159
 160                 memset(&dev, 0x00, sizeof(struct config_device));
 161
 162                 /* get all known keys */
 163                 while (1) {
 164                         retval = parse_get_pair(&temp, &temp2, &temp3);
 165                         if (retval)
 166                                 break;
 167
 168                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 169                                 strfieldcpy(dev.bus, temp3);
 170                                 continue;
 171                         }
 172
 173                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 174                                 strfieldcpy(dev.id, temp3);
 175                                 continue;
 176                         }
 177
 178                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 179                                 strfieldcpy(dev.place, temp3);
 180                                 continue;
 181                         }
 182
 183                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 184                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 185                                 int sysfs_pair_num = 0;
 186
 187                                 /* find first unused pair */
 188                                 while (pair->file[0] != '\0') {
 189                                         ++sysfs_pair_num;
 190                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 191                                                 pair = NULL;
 192                                                 break;
 193                                         }
 194                                         ++pair;
 195                                 }
 196                                 if (pair) {
 197                                         attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1);
 198                                         if (attr == NULL) {
 199                                                 dbg("error parsing " FIELD_SYSFS " attribute");
 200                                                 continue;
 201                                         }
 202                                         strfieldcpy(pair->file, attr);
 203                                         strfieldcpy(pair->value, temp3);
 204                                 }
 205                                 continue;
 206                         }
 207
 208                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 209                                 strfieldcpy(dev.kernel, temp3);
 210                                 continue;
 211                         }
 212
 213                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 214                                 program_given = 1;
 215                                 strfieldcpy(dev.program, temp3);
 216                                 continue;
 217                         }
 218
 219                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 220                                 strfieldcpy(dev.result, temp3);
 221                                 continue;
 222                         }
 223
 224                         if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) {
 225                                 attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1);
 226                                 if (attr != NULL)
 227                                         if (strcasecmp(attr, ATTR_PARTITIONS) == 0) {
 228                                                 dbg_parse("creation of partition nodes requested");
 229                                                 dev.partitions = PARTITIONS_COUNT;
 230                                         }
 231                                 strfieldcpy(dev.name, temp3);
 232                                 continue;
 233                         }
 234
 235                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 236                                 strfieldcpy(dev.symlink, temp3);
 237                                 continue;
 238                         }
 239
 240                         dbg("unknown type of field '%s'", temp2);
 241                         dbg("You might be using a rules file in the old format, please fix.");
 242                         goto error;
 243                 }
 244
 245                 /* simple plausibility check for given keys */
 246                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 247                     (dev.sysfs_pair[0].value[0] == '\0')) {
 248                         dbg("inconsistency in " FIELD_SYSFS " key");
 249                         goto error;
 250                 }
 251
 252                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 253                         dbg(FIELD_RESULT " is only useful when "
 254                             FIELD_PROGRAM " is called in any rule before");
 255                         goto error;
 256                 }
 257
 258                 dev.config_line = lineno;
 259                 retval = add_config_dev(&dev);
 260                 if (retval) {
 261                         dbg("add_config_dev returned with error %d", retval);
 262                         continue;
 263 error:
 264                         dbg("%s:%d:%d: parse error, rule skipped",
 265                                   udev_rules_filename, lineno, temp - line);
 266                 }
 267         }
 268 exit:
 269         fclose(fd);
 270         return retval;
 271 }
 272
 273 int namedev_init_permissions(void)
 274 {
 275         char line[255];
 276         char *temp;
 277         char *temp2;
 278         FILE *fd;
 279         int retval = 0;
 280         struct perm_device dev;
 281
 282         fd = fopen(udev_permissions_filename, "r");
 283         if (fd != NULL) {
 284                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 285         } else {
 286                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 287                 return -ENODEV;
 288         }
 289
 290         /* loop through the whole file */
 291         while (1) {
 292                 temp = fgets(line, sizeof(line), fd);
 293                 if (temp == NULL)
 294                         break;
 295
 296                 dbg_parse("read '%s'", temp);
 297
 298                 /* eat the whitespace at the beginning of the line */
 299                 while (isspace(*temp))
 300                         ++temp;
 301
 302                 /* empty line? */
 303                 if ((*temp == '\0') || (*temp == '\n'))
 304                         continue;
 305
 306                 /* see if this is a comment */
 307                 if (*temp == COMMENT_CHARACTER)
 308                         continue;
 309
 310                 memset(&dev, 0x00, sizeof(dev));
 311
 312                 /* parse the line */
 313                 temp2 = strsep(&temp, ":");
 314                 if (!temp2) {
 315                         dbg("cannot parse line '%s'", line);
 316                         continue;
 317                 }
 318                 strncpy(dev.name, temp2, sizeof(dev.name));
 319
 320                 temp2 = strsep(&temp, ":");
 321                 if (!temp2) {
 322                         dbg("cannot parse line '%s'", line);
 323                         continue;
 324                 }
 325                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 326
 327                 temp2 = strsep(&temp, ":");
 328                 if (!temp2) {
 329                         dbg("cannot parse line '%s'", line);
 330                         continue;
 331                 }
 332                 strncpy(dev.group, temp2, sizeof(dev.group));
 333
 334                 if (!temp) {
 335                         dbg("cannot parse line: %s", line);
 336                         continue;
 337                 }
 338                 dev.mode = strtol(temp, NULL, 8);
 339
 340                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 341                           dev.name, dev.owner, dev.group,
 342                           dev.mode);
 343                 retval = add_perm_dev(&dev);
 344                 if (retval) {
 345                         dbg("add_perm_dev returned with error %d", retval);
 346                         goto exit;
 347                 }
 348         }
 349
 350 exit:
 351         fclose(fd);
 352         return retval;
 353 }
 354