namedev_parse.c

   1 /*
   2  * namedev_parse.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 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 int get_pair(char **orig_string, char **left, char **right)
  56 {
  57         char *temp;
  58         char *string = *orig_string;
  59
  60         if (!string)
  61                 return -ENODEV;
  62
  63         /* eat any whitespace */
  64         while (isspace(*string) || *string == ',')
  65                 ++string;
  66
  67         /* split based on '=' */
  68         temp = strsep(&string, "=");
  69         *left = temp;
  70         if (!string)
  71                 return -ENODEV;
  72
  73         /* take the right side and strip off the '"' */
  74         while (isspace(*string))
  75                 ++string;
  76         if (*string == '"')
  77                 ++string;
  78         else
  79                 return -ENODEV;
  80
  81         temp = strsep(&string, "\"");
  82         if (!string || *temp == '\0')
  83                 return -ENODEV;
  84         *right = temp;
  85         *orig_string = string;
  86
  87         return 0;
  88 }
  89
  90 void dump_config_dev(struct config_device *dev)
  91 {
  92         /*FIXME dump all sysfs's */
  93         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  94                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  95                   "kernel='%s', program='%s', result='%s'",
  96                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  97                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  98                   dev->kernel, dev->program, dev->result);
  99 }
 100
 101 void dump_config_dev_list(void)
 102 {
 103         struct config_device *dev;
 104
 105         list_for_each_entry(dev, &config_device_list, node)
 106                 dump_config_dev(dev);
 107 }
 108
 109 void dump_perm_dev(struct perm_device *dev)
 110 {
 111         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 112                   dev->name, dev->owner, dev->group, dev->mode);
 113 }
 114
 115 void dump_perm_dev_list(void)
 116 {
 117         struct perm_device *dev;
 118
 119         list_for_each_entry(dev, &perm_device_list, node)
 120                 dump_perm_dev(dev);
 121 }
 122
 123 int namedev_init_rules(void)
 124 {
 125         char line[255];
 126         int lineno;
 127         char *temp;
 128         char *temp2;
 129         char *temp3;
 130         FILE *fd;
 131         int program_given = 0;
 132         int retval = 0;
 133         struct config_device dev;
 134
 135         fd = fopen(udev_rules_filename, "r");
 136         if (fd != NULL) {
 137                 dbg("reading '%s' as rules file", udev_rules_filename);
 138         } else {
 139                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 140                 return -ENODEV;
 141         }
 142
 143         /* loop through the whole file */
 144         lineno = 0;
 145         while (1) {
 146                 /* get a line */
 147                 temp = fgets(line, sizeof(line), fd);
 148                 if (temp == NULL)
 149                         goto exit;
 150                 lineno++;
 151                 dbg_parse("read '%s'", temp);
 152
 153                 /* eat the whitespace */
 154                 while (isspace(*temp))
 155                         ++temp;
 156
 157                 /* empty line? */
 158                 if ((*temp == '\0') || (*temp == '\n'))
 159                         continue;
 160
 161                 /* see if this is a comment */
 162                 if (*temp == COMMENT_CHARACTER)
 163                         continue;
 164
 165                 memset(&dev, 0x00, sizeof(struct config_device));
 166
 167                 /* get all known keys */
 168                 while (1) {
 169                         retval = get_pair(&temp, &temp2, &temp3);
 170                         if (retval)
 171                                 break;
 172
 173                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 174                                 strfieldcpy(dev.bus, temp3);
 175                                 continue;
 176                         }
 177
 178                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 179                                 strfieldcpy(dev.id, temp3);
 180                                 continue;
 181                         }
 182
 183                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 184                                 strfieldcpy(dev.place, temp3);
 185                                 continue;
 186                         }
 187
 188                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 189                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 190                                 int sysfs_pair_num = 0;
 191
 192                                 /* find first unused pair */
 193                                 while (pair->file[0] != '\0') {
 194                                         ++sysfs_pair_num;
 195                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 196                                                 pair = NULL;
 197                                                 break;
 198                                         }
 199                                         ++pair;
 200                                 }
 201                                 if (pair) {
 202                                         /* remove prepended 'SYSFS_' */
 203                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 204                                         strfieldcpy(pair->value, temp3);
 205                                 }
 206                                 continue;
 207                         }
 208
 209                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 210                                 strfieldcpy(dev.kernel, temp3);
 211                                 continue;
 212                         }
 213
 214                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 215                                 program_given = 1;
 216                                 strfieldcpy(dev.program, temp3);
 217                                 continue;
 218                         }
 219
 220                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 221                                 strfieldcpy(dev.result, temp3);
 222                                 continue;
 223                         }
 224
 225                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 226                                 strfieldcpy(dev.name, temp3);
 227                                 continue;
 228                         }
 229
 230                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 231                                 strfieldcpy(dev.symlink, temp3);
 232                                 continue;
 233                         }
 234
 235                         dbg("unknown type of field '%s'", temp2);
 236                         dbg("You might be using a rules file in the old format, please fix.");
 237                         goto error;
 238                 }
 239
 240                 /* simple plausibility check for given keys */
 241                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 242                     (dev.sysfs_pair[0].value[0] == '\0')) {
 243                         dbg("inconsistency in SYSFS_ key");
 244                         goto error;
 245                 }
 246
 247                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 248                         dbg("RESULT is only useful when PROGRAM called in any rule before");
 249                         goto error;
 250                 }
 251
 252                 dev.config_line = lineno;
 253                 retval = add_config_dev(&dev);
 254                 if (retval) {
 255                         dbg("add_config_dev returned with error %d", retval);
 256                         continue;
 257 error:
 258                         dbg("%s:%d:%d: parse error, rule skipped",
 259                                   udev_rules_filename, lineno, temp - line);
 260                 }
 261         }
 262 exit:
 263         fclose(fd);
 264         return retval;
 265 }
 266
 267 int namedev_init_permissions(void)
 268 {
 269         char line[255];
 270         char *temp;
 271         char *temp2;
 272         FILE *fd;
 273         int retval = 0;
 274         struct perm_device dev;
 275
 276         fd = fopen(udev_permissions_filename, "r");
 277         if (fd != NULL) {
 278                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 279         } else {
 280                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 281                 return -ENODEV;
 282         }
 283
 284         /* loop through the whole file */
 285         while (1) {
 286                 temp = fgets(line, sizeof(line), fd);
 287                 if (temp == NULL)
 288                         break;
 289
 290                 dbg_parse("read '%s'", temp);
 291
 292                 /* eat the whitespace at the beginning of the line */
 293                 while (isspace(*temp))
 294                         ++temp;
 295
 296                 /* empty line? */
 297                 if ((*temp == '\0') || (*temp == '\n'))
 298                         continue;
 299
 300                 /* see if this is a comment */
 301                 if (*temp == COMMENT_CHARACTER)
 302                         continue;
 303
 304                 memset(&dev, 0x00, sizeof(dev));
 305
 306                 /* parse the line */
 307                 temp2 = strsep(&temp, ":");
 308                 if (!temp2) {
 309                         dbg("cannot parse line '%s'", line);
 310                         continue;
 311                 }
 312                 strncpy(dev.name, temp2, sizeof(dev.name));
 313
 314                 temp2 = strsep(&temp, ":");
 315                 if (!temp2) {
 316                         dbg("cannot parse line '%s'", line);
 317                         continue;
 318                 }
 319                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 320
 321                 temp2 = strsep(&temp, ":");
 322                 if (!temp2) {
 323                         dbg("cannot parse line '%s'", line);
 324                         continue;
 325                 }
 326                 strncpy(dev.group, temp2, sizeof(dev.group));
 327
 328                 if (!temp) {
 329                         dbg("cannot parse line: %s", line);
 330                         continue;
 331                 }
 332                 dev.mode = strtol(temp, NULL, 8);
 333
 334                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 335                           dev.name, dev.owner, dev.group,
 336                           dev.mode);
 337                 retval = add_perm_dev(&dev);
 338                 if (retval) {
 339                         dbg("add_perm_dev returned with error %d", retval);
 340                         goto exit;
 341                 }
 342         }
 343
 344 exit:
 345         fclose(fd);
 346         return retval;
 347 }
 348