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 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_rules(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         fd = fopen(udev_rules_filename, "r");
 152         if (fd != NULL) {
 153                 dbg("reading '%s' as rules file", udev_rules_filename);
 154         } else {
 155                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 156                 return -ENODEV;
 157         }
 158
 159         /* loop through the whole file */
 160         lineno = 0;
 161         while (1) {
 162                 /* get a line */
 163                 temp = fgets(line, sizeof(line), fd);
 164                 if (temp == NULL)
 165                         goto exit;
 166                 lineno++;
 167
 168                 dbg_parse("read '%s'", temp);
 169
 170                 /* eat the whitespace at the beginning of the line */
 171                 while (isspace(*temp))
 172                         ++temp;
 173
 174                 /* empty line? */
 175                 if (*temp == 0x00)
 176                         continue;
 177
 178                 /* see if this is a comment */
 179                 if (*temp == COMMENT_CHARACTER)
 180                         continue;
 181
 182                 memset(&dev, 0x00, sizeof(struct config_device));
 183
 184                 /* parse the line */
 185                 temp2 = strsep(&temp, ",");
 186                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 187                         /* label type */
 188                         dev.type = LABEL;
 189
 190                         /* BUS="bus" */
 191                         retval = get_value("BUS", &temp, &temp3);
 192                         if (retval)
 193                                 break;
 194                         strfieldcpy(dev.bus, temp3);
 195
 196                         /* file="value" */
 197                         temp2 = strsep(&temp, ",");
 198                         retval = get_pair(&temp, &temp2, &temp3);
 199                         if (retval)
 200                                 break;
 201                         strfieldcpy(dev.sysfs_file, temp2);
 202                         strfieldcpy(dev.sysfs_value, temp3);
 203
 204                         /* NAME="new_name" */
 205                         temp2 = strsep(&temp, ",");
 206                         retval = get_value("NAME", &temp, &temp3);
 207                         if (retval)
 208                                 break;
 209                         strfieldcpy(dev.name, temp3);
 210
 211                         dbg_parse("LABEL name='%s', bus='%s', "
 212                                   "sysfs_file='%s', sysfs_value='%s'",
 213                                   dev.name, dev.bus, dev.sysfs_file,
 214                                   dev.sysfs_value);
 215                 }
 216
 217                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 218                         /* number type */
 219                         dev.type = NUMBER;
 220
 221                         /* BUS="bus" */
 222                         retval = get_value("BUS", &temp, &temp3);
 223                         if (retval)
 224                                 break;
 225                         strfieldcpy(dev.bus, temp3);
 226
 227                         /* ID="id" */
 228                         temp2 = strsep(&temp, ",");
 229                         retval = get_value("ID", &temp, &temp3);
 230                         if (retval)
 231                                 break;
 232                         strfieldcpy(dev.id, temp3);
 233
 234                         /* NAME="new_name" */
 235                         temp2 = strsep(&temp, ",");
 236                         retval = get_value("NAME", &temp, &temp3);
 237                         if (retval)
 238                                 break;
 239                         strfieldcpy(dev.name, temp3);
 240
 241                         dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
 242                                   dev.name, dev.bus, dev.id);
 243                 }
 244
 245                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 246                         /* number type */
 247                         dev.type = TOPOLOGY;
 248
 249                         /* BUS="bus" */
 250                         retval = get_value("BUS", &temp, &temp3);
 251                         if (retval)
 252                                 break;
 253                         strfieldcpy(dev.bus, temp3);
 254
 255                         /* PLACE="place" */
 256                         temp2 = strsep(&temp, ",");
 257                         retval = get_value("PLACE", &temp, &temp3);
 258                         if (retval)
 259                                 break;
 260                         strfieldcpy(dev.place, temp3);
 261
 262                         /* NAME="new_name" */
 263                         temp2 = strsep(&temp, ",");
 264                         retval = get_value("NAME", &temp, &temp3);
 265                         if (retval)
 266                                 break;
 267                         strfieldcpy(dev.name, temp3);
 268
 269                         dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 270                                   dev.name, dev.bus, dev.place);
 271                 }
 272
 273                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 274                         /* number type */
 275                         dev.type = REPLACE;
 276
 277                         /* KERNEL="kernel_name" */
 278                         retval = get_value("KERNEL", &temp, &temp3);
 279                         if (retval)
 280                                 break;
 281                         strfieldcpy(dev.kernel_name, temp3);
 282
 283                         /* NAME="new_name" */
 284                         temp2 = strsep(&temp, ",");
 285                         retval = get_value("NAME", &temp, &temp3);
 286                         if (retval)
 287                                 break;
 288                         strfieldcpy(dev.name, temp3);
 289                         dbg_parse("REPLACE name='%s', kernel_name='%s'",
 290                                   dev.name, dev.kernel_name);
 291                 }
 292                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 293                         /* number type */
 294                         dev.type = CALLOUT;
 295
 296                         /* BUS="bus" */
 297                         retval = get_value("BUS", &temp, &temp3);
 298                         if (retval)
 299                                 break;
 300                         strfieldcpy(dev.bus, temp3);
 301
 302                         /* PROGRAM="executable" */
 303                         temp2 = strsep(&temp, ",");
 304                         retval = get_value("PROGRAM", &temp, &temp3);
 305                         if (retval)
 306                                 break;
 307                         strfieldcpy(dev.exec_program, temp3);
 308
 309                         /* ID="id" */
 310                         temp2 = strsep(&temp, ",");
 311                         retval = get_value("ID", &temp, &temp3);
 312                         if (retval)
 313                                 break;
 314                         strfieldcpy(dev.id, temp3);
 315
 316                         /* NAME="new_name" */
 317                         temp2 = strsep(&temp, ",");
 318                         retval = get_value("NAME", &temp, &temp3);
 319                         if (retval)
 320                                 break;
 321                         strfieldcpy(dev.name, temp3);
 322                         dbg_parse("CALLOUT name='%s', program='%s'",
 323                                   dev.name, dev.exec_program);
 324                 }
 325
 326                 retval = add_config_dev(&dev);
 327                 if (retval) {
 328                         dbg("add_config_dev returned with error %d", retval);
 329                         goto exit;
 330                 }
 331         }
 332         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_rules_filename,
 333                   lineno, temp - line, temp);
 334 exit:
 335         fclose(fd);
 336         return retval;
 337 }
 338
 339
 340 int namedev_init_permissions(void)
 341 {
 342         char line[255];
 343         char *temp;
 344         char *temp2;
 345         FILE *fd;
 346         int retval = 0;
 347         struct config_device dev;
 348
 349         fd = fopen(udev_permissions_filename, "r");
 350         if (fd != NULL) {
 351                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 352         } else {
 353                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 354                 return -ENODEV;
 355         }
 356
 357         /* loop through the whole file */
 358         while (1) {
 359                 temp = fgets(line, sizeof(line), fd);
 360                 if (temp == NULL)
 361                         break;
 362
 363                 dbg_parse("read '%s'", temp);
 364
 365                 /* eat the whitespace at the beginning of the line */
 366                 while (isspace(*temp))
 367                         ++temp;
 368
 369                 /* empty line? */
 370                 if (*temp == 0x00)
 371                         continue;
 372
 373                 /* see if this is a comment */
 374                 if (*temp == COMMENT_CHARACTER)
 375                         continue;
 376
 377                 memset(&dev, 0x00, sizeof(dev));
 378
 379                 /* parse the line */
 380                 temp2 = strsep(&temp, ":");
 381                 if (!temp2) {
 382                         dbg("cannot parse line '%s'", line);
 383                         continue;
 384                 }
 385                 strncpy(dev.name, temp2, sizeof(dev.name));
 386
 387                 temp2 = strsep(&temp, ":");
 388                 if (!temp2) {
 389                         dbg("cannot parse line '%s'", line);
 390                         continue;
 391                 }
 392                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 393
 394                 temp2 = strsep(&temp, ":");
 395                 if (!temp2) {
 396                         dbg("cannot parse line '%s'", line);
 397                         continue;
 398                 }
 399                 strncpy(dev.group, temp2, sizeof(dev.owner));
 400
 401                 if (!temp) {
 402                         dbg("cannot parse line: %s", line);
 403                         continue;
 404                 }
 405                 dev.mode = strtol(temp, NULL, 8);
 406
 407                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 408                           dev.name, dev.owner, dev.group,
 409                           dev.mode);
 410                 retval = add_config_dev(&dev);
 411                 if (retval) {
 412                         dbg("add_config_dev returned with error %d", retval);
 413                         goto exit;
 414                 }
 415         }
 416
 417 exit:
 418         fclose(fd);
 419         return retval;
 420 }
 421
 422