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 /* define this to enable parsing debugging */
  25 /* #define DEBUG_PARSER */
  26
  27 #include <stddef.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <fcntl.h>
  32 #include <ctype.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35
  36 #include "udev.h"
  37 #include "namedev.h"
  38
  39 static int get_pair(char **orig_string, char **left, char **right)
  40 {
  41         char *temp;
  42         char *string = *orig_string;
  43
  44         if (!string)
  45                 return -ENODEV;
  46
  47         /* eat any whitespace */
  48         while (isspace(*string))
  49                 ++string;
  50
  51         /* split based on '=' */
  52         temp = strsep(&string, "=");
  53         *left = temp;
  54         if (!string)
  55                 return -ENODEV;
  56
  57         /* take the right side and strip off the '"' */
  58         while (isspace(*string))
  59                 ++string;
  60         if (*string == '"')
  61                 ++string;
  62         else
  63                 return -ENODEV;
  64
  65         temp = strsep(&string, "\"");
  66         if (!string || *temp == '\0')
  67                 return -ENODEV;
  68         *right = temp;
  69         *orig_string = string;
  70
  71         return 0;
  72 }
  73
  74 static int get_value(const char *left, char **orig_string, char **ret_string)
  75 {
  76         int retval;
  77         char *left_string;
  78
  79         retval = get_pair(orig_string, &left_string, ret_string);
  80         if (retval)
  81                 return retval;
  82         if (strcasecmp(left_string, left) != 0)
  83                 return -ENODEV;
  84         return 0;
  85 }
  86
  87 void dump_config_dev(struct config_device *dev)
  88 {
  89         switch (dev->type) {
  90         case KERNEL_NAME:
  91                 dbg_parse("KERNEL name='%s' ,"
  92                           "owner='%s', group='%s', mode=%#o",
  93                           dev->name, dev->owner, dev->group, dev->mode);
  94                 break;
  95         case LABEL:
  96                 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s', "
  97                           "owner='%s', group='%s', mode=%#o",
  98                           dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value,
  99                           dev->owner, dev->group, dev->mode);
 100                 break;
 101         case NUMBER:
 102                 dbg_parse("NUMBER name='%s', bus='%s', id='%s', "
 103                           "owner='%s', group='%s', mode=%#o",
 104                           dev->name, dev->bus, dev->id,
 105                           dev->owner, dev->group, dev->mode);
 106                 break;
 107         case TOPOLOGY:
 108                 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s', "
 109                           "owner='%s', group='%s', mode=%#o",
 110                           dev->name, dev->bus, dev->place,
 111                           dev->owner, dev->group, dev->mode);
 112                 break;
 113         case REPLACE:
 114                 dbg_parse("REPLACE name=%s, kernel_name=%s, "
 115                           "owner='%s', group='%s', mode=%#o",
 116                           dev->name, dev->kernel_name,
 117                           dev->owner, dev->group, dev->mode);
 118                 break;
 119         case CALLOUT:
 120                 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s', "
 121                           "owner='%s', group='%s', mode=%#o",
 122                           dev->name, dev->bus, dev->exec_program, dev->id,
 123                           dev->owner, dev->group, dev->mode);
 124                 break;
 125         default:
 126                 dbg_parse("unknown type of method");
 127         }
 128 }
 129
 130 void dump_config_dev_list(void)
 131 {
 132         struct list_head *tmp;
 133
 134         list_for_each(tmp, &config_device_list) {
 135                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 136                 dump_config_dev(dev);
 137         }
 138 }
 139
 140 int namedev_init_config(void)
 141 {
 142         char line[255];
 143         int lineno;
 144         char *temp;
 145         char *temp2;
 146         char *temp3;
 147         FILE *fd;
 148         int retval = 0;
 149         struct config_device dev;
 150
 151         dbg("opening '%s' to read as config", udev_config_filename);
 152         fd = fopen(udev_config_filename, "r");
 153         if (fd == NULL) {
 154                 dbg("can't open '%s'", udev_config_filename);
 155                 return -ENODEV;
 156         }
 157
 158         /* loop through the whole file */
 159         lineno = 0;
 160         while (1) {
 161                 /* get a line */
 162                 temp = fgets(line, sizeof(line), fd);
 163                 if (temp == NULL)
 164                         goto exit;
 165                 lineno++;
 166
 167                 dbg_parse("read '%s'", temp);
 168
 169                 /* eat the whitespace at the beginning of the line */
 170                 while (isspace(*temp))
 171                         ++temp;
 172
 173                 /* empty line? */
 174                 if (*temp == 0x00)
 175                         continue;
 176
 177                 /* see if this is a comment */
 178                 if (*temp == COMMENT_CHARACTER)
 179                         continue;
 180
 181                 memset(&dev, 0x00, sizeof(struct config_device));
 182
 183                 /* parse the line */
 184                 temp2 = strsep(&temp, ",");
 185                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 186                         /* label type */
 187                         dev.type = LABEL;
 188
 189                         /* BUS="bus" */
 190                         retval = get_value("BUS", &temp, &temp3);
 191                         if (retval)
 192                                 break;
 193                         strfieldcpy(dev.bus, temp3);
 194
 195                         /* file="value" */
 196                         temp2 = strsep(&temp, ",");
 197                         retval = get_pair(&temp, &temp2, &temp3);
 198                         if (retval)
 199                                 break;
 200                         strfieldcpy(dev.sysfs_file, temp2);
 201                         strfieldcpy(dev.sysfs_value, temp3);
 202
 203                         /* NAME="new_name" */
 204                         temp2 = strsep(&temp, ",");
 205                         retval = get_value("NAME", &temp, &temp3);
 206                         if (retval)
 207                                 break;
 208                         strfieldcpy(dev.name, temp3);
 209
 210                         dbg_parse("LABEL name='%s', bus='%s', "
 211                                   "sysfs_file='%s', sysfs_value='%s'",
 212                                   dev.name, dev.bus, dev.sysfs_file,
 213                                   dev.sysfs_value);
 214                 }
 215
 216                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 217                         /* number type */
 218                         dev.type = NUMBER;
 219
 220                         /* BUS="bus" */
 221                         retval = get_value("BUS", &temp, &temp3);
 222                         if (retval)
 223                                 break;
 224                         strfieldcpy(dev.bus, temp3);
 225
 226                         /* ID="id" */
 227                         temp2 = strsep(&temp, ",");
 228                         retval = get_value("ID", &temp, &temp3);
 229                         if (retval)
 230                                 break;
 231                         strfieldcpy(dev.id, temp3);
 232
 233                         /* NAME="new_name" */
 234                         temp2 = strsep(&temp, ",");
 235                         retval = get_value("NAME", &temp, &temp3);
 236                         if (retval)
 237                                 break;
 238                         strfieldcpy(dev.name, temp3);
 239
 240                         dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
 241                                   dev.name, dev.bus, dev.id);
 242                 }
 243
 244                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 245                         /* number type */
 246                         dev.type = TOPOLOGY;
 247
 248                         /* BUS="bus" */
 249                         retval = get_value("BUS", &temp, &temp3);
 250                         if (retval)
 251                                 break;
 252                         strfieldcpy(dev.bus, temp3);
 253
 254                         /* PLACE="place" */
 255                         temp2 = strsep(&temp, ",");
 256                         retval = get_value("PLACE", &temp, &temp3);
 257                         if (retval)
 258                                 break;
 259                         strfieldcpy(dev.place, temp3);
 260
 261                         /* NAME="new_name" */
 262                         temp2 = strsep(&temp, ",");
 263                         retval = get_value("NAME", &temp, &temp3);
 264                         if (retval)
 265                                 break;
 266                         strfieldcpy(dev.name, temp3);
 267
 268                         dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 269                                   dev.name, dev.bus, dev.place);
 270                 }
 271
 272                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 273                         /* number type */
 274                         dev.type = REPLACE;
 275
 276                         /* KERNEL="kernel_name" */
 277                         retval = get_value("KERNEL", &temp, &temp3);
 278                         if (retval)
 279                                 break;
 280                         strfieldcpy(dev.kernel_name, temp3);
 281
 282                         /* NAME="new_name" */
 283                         temp2 = strsep(&temp, ",");
 284                         retval = get_value("NAME", &temp, &temp3);
 285                         if (retval)
 286                                 break;
 287                         strfieldcpy(dev.name, temp3);
 288                         dbg_parse("REPLACE name='%s', kernel_name='%s'",
 289                                   dev.name, dev.kernel_name);
 290                 }
 291                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 292                         /* number type */
 293                         dev.type = CALLOUT;
 294
 295                         /* BUS="bus" */
 296                         retval = get_value("BUS", &temp, &temp3);
 297                         if (retval)
 298                                 break;
 299                         strfieldcpy(dev.bus, temp3);
 300
 301                         /* PROGRAM="executable" */
 302                         temp2 = strsep(&temp, ",");
 303                         retval = get_value("PROGRAM", &temp, &temp3);
 304                         if (retval)
 305                                 break;
 306                         strfieldcpy(dev.exec_program, temp3);
 307
 308                         /* ID="id" */
 309                         temp2 = strsep(&temp, ",");
 310                         retval = get_value("ID", &temp, &temp3);
 311                         if (retval)
 312                                 break;
 313                         strfieldcpy(dev.id, temp3);
 314
 315                         /* NAME="new_name" */
 316                         temp2 = strsep(&temp, ",");
 317                         retval = get_value("NAME", &temp, &temp3);
 318                         if (retval)
 319                                 break;
 320                         strfieldcpy(dev.name, temp3);
 321                         dbg_parse("CALLOUT name='%s', program='%s'",
 322                                   dev.name, dev.exec_program);
 323                 }
 324
 325                 retval = add_config_dev(&dev);
 326                 if (retval) {
 327                         dbg("add_config_dev returned with error %d", retval);
 328                         goto exit;
 329                 }
 330         }
 331         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
 332                   lineno, temp - line, temp);
 333 exit:
 334         fclose(fd);
 335         return retval;
 336 }
 337
 338
 339 int namedev_init_permissions(void)
 340 {
 341         char line[255];
 342         char *temp;
 343         char *temp2;
 344         FILE *fd;
 345         int retval = 0;
 346         struct config_device dev;
 347
 348         dbg("opening '%s' to read as permissions config", udev_config_permission_filename);
 349         fd = fopen(udev_config_permission_filename, "r");
 350         if (fd == NULL) {
 351                 dbg("can't open '%s'", udev_config_permission_filename);
 352                 return -ENODEV;
 353         }
 354
 355         /* loop through the whole file */
 356         while (1) {
 357                 temp = fgets(line, sizeof(line), fd);
 358                 if (temp == NULL)
 359                         break;
 360
 361                 dbg_parse("read '%s'", temp);
 362
 363                 /* eat the whitespace at the beginning of the line */
 364                 while (isspace(*temp))
 365                         ++temp;
 366
 367                 /* empty line? */
 368                 if (*temp == 0x00)
 369                         continue;
 370
 371                 /* see if this is a comment */
 372                 if (*temp == COMMENT_CHARACTER)
 373                         continue;
 374
 375                 memset(&dev, 0x00, sizeof(dev));
 376
 377                 /* parse the line */
 378                 temp2 = strsep(&temp, ":");
 379                 if (!temp2) {
 380                         dbg("cannot parse line '%s'", line);
 381                         continue;
 382                 }
 383                 strncpy(dev.name, temp2, sizeof(dev.name));
 384
 385                 temp2 = strsep(&temp, ":");
 386                 if (!temp2) {
 387                         dbg("cannot parse line '%s'", line);
 388                         continue;
 389                 }
 390                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 391
 392                 temp2 = strsep(&temp, ":");
 393                 if (!temp2) {
 394                         dbg("cannot parse line '%s'", line);
 395                         continue;
 396                 }
 397                 strncpy(dev.group, temp2, sizeof(dev.owner));
 398
 399                 if (!temp) {
 400                         dbg("cannot parse line: %s", line);
 401                         continue;
 402                 }
 403                 dev.mode = strtol(temp, NULL, 8);
 404
 405                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 406                           dev.name, dev.owner, dev.group,
 407                           dev.mode);
 408                 retval = add_config_dev(&dev);
 409                 if (retval) {
 410                         dbg("add_config_dev returned with error %d", retval);
 411                         goto exit;
 412                 }
 413         }
 414
 415 exit:
 416         fclose(fd);
 417         return retval;
 418 }
 419
 420