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
 124 int namedev_init_rules(void)
 125 {
 126         char line[255];
 127         int lineno;
 128         char *temp;
 129         char *temp2;
 130         char *temp3;
 131         FILE *fd;
 132         int program_given = 0;
 133         int retval = 0;
 134         struct config_device dev;
 135
 136         fd = fopen(udev_rules_filename, "r");
 137         if (fd != NULL) {
 138                 dbg("reading '%s' as rules file", udev_rules_filename);
 139         } else {
 140                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 141                 return -ENODEV;
 142         }
 143
 144         /* loop through the whole file */
 145         lineno = 0;
 146         while (1) {
 147                 /* get a line */
 148                 temp = fgets(line, sizeof(line), fd);
 149                 if (temp == NULL)
 150                         goto exit;
 151                 lineno++;
 152                 dbg_parse("read '%s'", temp);
 153
 154                 /* eat the whitespace */
 155                 while (isspace(*temp))
 156                         ++temp;
 157
 158                 /* empty line? */
 159                 if ((*temp == '\0') || (*temp == '\n'))
 160                         continue;
 161
 162                 /* see if this is a comment */
 163                 if (*temp == COMMENT_CHARACTER)
 164                         continue;
 165
 166                 memset(&dev, 0x00, sizeof(struct config_device));
 167
 168                 /* get all known keys */
 169                 while (1) {
 170                         retval = get_pair(&temp, &temp2, &temp3);
 171                         if (retval)
 172                                 break;
 173
 174                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 175                                 strfieldcpy(dev.bus, temp3);
 176                                 continue;
 177                         }
 178
 179                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 180                                 strfieldcpy(dev.id, temp3);
 181                                 continue;
 182                         }
 183
 184                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 185                                 strfieldcpy(dev.place, temp3);
 186                                 continue;
 187                         }
 188
 189                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 190                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 191                                 int sysfs_pair_num = 0;
 192
 193                                 /* find first unused pair */
 194                                 while (pair->file[0] != '\0') {
 195                                         ++sysfs_pair_num;
 196                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 197                                                 pair = NULL;
 198                                                 break;
 199                                         }
 200                                         ++pair;
 201                                 }
 202                                 if (pair) {
 203                                         /* remove prepended 'SYSFS_' */
 204                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 205                                         strfieldcpy(pair->value, temp3);
 206                                 }
 207                                 continue;
 208                         }
 209
 210                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 211                                 strfieldcpy(dev.kernel, temp3);
 212                                 continue;
 213                         }
 214
 215                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 216                                 program_given = 1;
 217                                 strfieldcpy(dev.program, temp3);
 218                                 continue;
 219                         }
 220
 221                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 222                                 strfieldcpy(dev.result, temp3);
 223                                 continue;
 224                         }
 225
 226                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 227                                 strfieldcpy(dev.name, temp3);
 228                                 continue;
 229                         }
 230
 231                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 232                                 strfieldcpy(dev.symlink, temp3);
 233                                 continue;
 234                         }
 235
 236                         dbg("unknown type of field '%s'", temp2);
 237                         dbg("You might be using a rules file in the old format, please fix.");
 238                         goto error;
 239                 }
 240
 241                 /* simple plausibility check for given keys */
 242                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 243                     (dev.sysfs_pair[0].value[0] == '\0')) {
 244                         dbg("inconsistency in SYSFS_ key");
 245                         goto error;
 246                 }
 247
 248                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 249                         dbg("RESULT is only useful when PROGRAM called in any rule before");
 250                         goto error;
 251                 }
 252
 253                 dev.config_line = lineno;
 254                 retval = add_config_dev(&dev);
 255                 if (retval) {
 256                         dbg("add_config_dev returned with error %d", retval);
 257                         continue;
 258 error:
 259                         dbg("%s:%d:%d: parse error, rule skipped",
 260                                   udev_rules_filename, lineno, temp - line);
 261                 }
 262         }
 263 exit:
 264         fclose(fd);
 265         return retval;
 266 }
 267
 268 int namedev_init_permissions(void)
 269 {
 270         char line[255];
 271         char *temp;
 272         char *temp2;
 273         FILE *fd;
 274         int retval = 0;
 275         struct perm_device dev;
 276
 277         fd = fopen(udev_permissions_filename, "r");
 278         if (fd != NULL) {
 279                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 280         } else {
 281                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 282                 return -ENODEV;
 283         }
 284
 285         /* loop through the whole file */
 286         while (1) {
 287                 temp = fgets(line, sizeof(line), fd);
 288                 if (temp == NULL)
 289                         break;
 290
 291                 dbg_parse("read '%s'", temp);
 292
 293                 /* eat the whitespace at the beginning of the line */
 294                 while (isspace(*temp))
 295                         ++temp;
 296
 297                 /* empty line? */
 298                 if ((*temp == '\0') || (*temp == '\n'))
 299                         continue;
 300
 301                 /* see if this is a comment */
 302                 if (*temp == COMMENT_CHARACTER)
 303                         continue;
 304
 305                 memset(&dev, 0x00, sizeof(dev));
 306
 307                 /* parse the line */
 308                 temp2 = strsep(&temp, ":");
 309                 if (!temp2) {
 310                         dbg("cannot parse line '%s'", line);
 311                         continue;
 312                 }
 313                 strncpy(dev.name, temp2, sizeof(dev.name));
 314
 315                 temp2 = strsep(&temp, ":");
 316                 if (!temp2) {
 317                         dbg("cannot parse line '%s'", line);
 318                         continue;
 319                 }
 320                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 321
 322                 temp2 = strsep(&temp, ":");
 323                 if (!temp2) {
 324                         dbg("cannot parse line '%s'", line);
 325                         continue;
 326                 }
 327                 strncpy(dev.group, temp2, sizeof(dev.group));
 328
 329                 if (!temp) {
 330                         dbg("cannot parse line: %s", line);
 331                         continue;
 332                 }
 333                 dev.mode = strtol(temp, NULL, 8);
 334
 335                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 336                           dev.name, dev.owner, dev.group,
 337                           dev.mode);
 338                 retval = add_perm_dev(&dev);
 339                 if (retval) {
 340                         dbg("add_perm_dev returned with error %d", retval);
 341                         goto exit;
 342                 }
 343         }
 344
 345 exit:
 346         fclose(fd);
 347         return retval;
 348 }
 349
 350