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 "namedev.h"
  40
  41 static int add_config_dev(struct config_device *new_dev)
  42 {
  43         struct config_device *tmp_dev;
  44
  45         tmp_dev = malloc(sizeof(*tmp_dev));
  46         if (tmp_dev == NULL)
  47                 return -ENOMEM;
  48         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  49         list_add_tail(&tmp_dev->node, &config_device_list);
  50         //dump_config_dev(tmp_dev);
  51         return 0;
  52 }
  53
  54 int get_pair(char **orig_string, char **left, char **right)
  55 {
  56         char *temp;
  57         char *string = *orig_string;
  58
  59         if (!string)
  60                 return -ENODEV;
  61
  62         /* eat any whitespace */
  63         while (isspace(*string) || *string == ',')
  64                 ++string;
  65
  66         /* split based on '=' */
  67         temp = strsep(&string, "=");
  68         *left = temp;
  69         if (!string)
  70                 return -ENODEV;
  71
  72         /* take the right side and strip off the '"' */
  73         while (isspace(*string))
  74                 ++string;
  75         if (*string == '"')
  76                 ++string;
  77         else
  78                 return -ENODEV;
  79
  80         temp = strsep(&string, "\"");
  81         if (!string || *temp == '\0')
  82                 return -ENODEV;
  83         *right = temp;
  84         *orig_string = string;
  85
  86         return 0;
  87 }
  88
  89 void dump_config_dev(struct config_device *dev)
  90 {
  91         /*FIXME dump all sysfs's */
  92         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  93                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  94                   "kernel='%s', program='%s', result='%s'",
  95                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  96                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  97                   dev->kernel, dev->program, dev->result);
  98 }
  99
 100 void dump_config_dev_list(void)
 101 {
 102         struct config_device *dev;
 103
 104         list_for_each_entry(dev, &config_device_list, node)
 105                 dump_config_dev(dev);
 106 }
 107
 108 void dump_perm_dev(struct perm_device *dev)
 109 {
 110         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 111                   dev->name, dev->owner, dev->group, dev->mode);
 112 }
 113
 114 void dump_perm_dev_list(void)
 115 {
 116         struct perm_device *dev;
 117
 118         list_for_each_entry(dev, &perm_device_list, node)
 119                 dump_perm_dev(dev);
 120 }
 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                 retval = add_config_dev(&dev);
 253                 if (retval) {
 254                         dbg("add_config_dev returned with error %d", retval);
 255                         continue;
 256 error:
 257                         dbg("%s:%d:%d: parse error, rule skipped",
 258                                   udev_rules_filename, lineno, temp - line);
 259                 }
 260         }
 261 exit:
 262         fclose(fd);
 263         return retval;
 264 }
 265
 266 int namedev_init_permissions(void)
 267 {
 268         char line[255];
 269         char *temp;
 270         char *temp2;
 271         FILE *fd;
 272         int retval = 0;
 273         struct perm_device dev;
 274
 275         fd = fopen(udev_permissions_filename, "r");
 276         if (fd != NULL) {
 277                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 278         } else {
 279                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 280                 return -ENODEV;
 281         }
 282
 283         /* loop through the whole file */
 284         while (1) {
 285                 temp = fgets(line, sizeof(line), fd);
 286                 if (temp == NULL)
 287                         break;
 288
 289                 dbg_parse("read '%s'", temp);
 290
 291                 /* eat the whitespace at the beginning of the line */
 292                 while (isspace(*temp))
 293                         ++temp;
 294
 295                 /* empty line? */
 296                 if ((*temp == '\0') || (*temp == '\n'))
 297                         continue;
 298
 299                 /* see if this is a comment */
 300                 if (*temp == COMMENT_CHARACTER)
 301                         continue;
 302
 303                 memset(&dev, 0x00, sizeof(dev));
 304
 305                 /* parse the line */
 306                 temp2 = strsep(&temp, ":");
 307                 if (!temp2) {
 308                         dbg("cannot parse line '%s'", line);
 309                         continue;
 310                 }
 311                 strncpy(dev.name, temp2, sizeof(dev.name));
 312
 313                 temp2 = strsep(&temp, ":");
 314                 if (!temp2) {
 315                         dbg("cannot parse line '%s'", line);
 316                         continue;
 317                 }
 318                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 319
 320                 temp2 = strsep(&temp, ":");
 321                 if (!temp2) {
 322                         dbg("cannot parse line '%s'", line);
 323                         continue;
 324                 }
 325                 strncpy(dev.group, temp2, sizeof(dev.owner));
 326
 327                 if (!temp) {
 328                         dbg("cannot parse line: %s", line);
 329                         continue;
 330                 }
 331                 dev.mode = strtol(temp, NULL, 8);
 332
 333                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 334                           dev.name, dev.owner, dev.group,
 335                           dev.mode);
 336                 retval = add_perm_dev(&dev);
 337                 if (retval) {
 338                         dbg("add_perm_dev returned with error %d", retval);
 339                         goto exit;
 340                 }
 341         }
 342
 343 exit:
 344         fclose(fd);
 345         return retval;
 346 }
 347
 348