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'", dev->name);
  92                 break;
  93         case LABEL:
  94                 dbg_parse("LABEL name='%s', bus='%s', sysfs_file='%s', sysfs_value='%s'",
  95                           dev->name, dev->bus, dev->sysfs_file, dev->sysfs_value);
  96                 break;
  97         case NUMBER:
  98                 dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
  99                           dev->name, dev->bus, dev->id);
 100                 break;
 101         case TOPOLOGY:
 102                 dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 103                           dev->name, dev->bus, dev->place);
 104                 break;
 105         case REPLACE:
 106                 dbg_parse("REPLACE name=%s, kernel_name=%s",
 107                           dev->name, dev->kernel_name);
 108                 break;
 109         case CALLOUT:
 110                 dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s'",
 111                           dev->name, dev->bus, dev->exec_program, dev->id);
 112                 break;
 113         default:
 114                 dbg_parse("unknown type of method");
 115         }
 116 }
 117
 118 void dump_config_dev_list(void)
 119 {
 120         struct list_head *tmp;
 121
 122         list_for_each(tmp, &config_device_list) {
 123                 struct config_device *dev = list_entry(tmp, struct config_device, node);
 124                 dump_config_dev(dev);
 125         }
 126 }
 127
 128 void dump_perm_dev(struct perm_device *dev)
 129 {
 130         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 131                   dev->name, dev->owner, dev->group, dev->mode);
 132 }
 133
 134 void dump_perm_dev_list(void)
 135 {
 136         struct list_head *tmp;
 137
 138         list_for_each(tmp, &perm_device_list) {
 139                 struct perm_device *dev = list_entry(tmp, struct perm_device, node);
 140                 dump_perm_dev(dev);
 141         }
 142 }
 143
 144
 145 int namedev_init_rules(void)
 146 {
 147         char line[255];
 148         int lineno;
 149         char *temp;
 150         char *temp2;
 151         char *temp3;
 152         FILE *fd;
 153         int retval = 0;
 154         struct config_device dev;
 155
 156         fd = fopen(udev_rules_filename, "r");
 157         if (fd != NULL) {
 158                 dbg("reading '%s' as rules file", udev_rules_filename);
 159         } else {
 160                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 161                 return -ENODEV;
 162         }
 163
 164         /* loop through the whole file */
 165         lineno = 0;
 166         while (1) {
 167                 /* get a line */
 168                 temp = fgets(line, sizeof(line), fd);
 169                 if (temp == NULL)
 170                         goto exit;
 171                 lineno++;
 172
 173                 dbg_parse("read '%s'", temp);
 174
 175                 /* eat the whitespace at the beginning of the line */
 176                 while (isspace(*temp))
 177                         ++temp;
 178
 179                 /* empty line? */
 180                 if (*temp == 0x00)
 181                         continue;
 182
 183                 /* see if this is a comment */
 184                 if (*temp == COMMENT_CHARACTER)
 185                         continue;
 186
 187                 memset(&dev, 0x00, sizeof(struct config_device));
 188
 189                 /* parse the line */
 190                 temp2 = strsep(&temp, ",");
 191                 if (strcasecmp(temp2, TYPE_LABEL) == 0) {
 192                         /* label type */
 193                         dev.type = LABEL;
 194
 195                         /* BUS="bus" */
 196                         retval = get_value("BUS", &temp, &temp3);
 197                         if (retval)
 198                                 break;
 199                         strfieldcpy(dev.bus, temp3);
 200
 201                         /* file="value" */
 202                         temp2 = strsep(&temp, ",");
 203                         retval = get_pair(&temp, &temp2, &temp3);
 204                         if (retval)
 205                                 break;
 206                         strfieldcpy(dev.sysfs_file, temp2);
 207                         strfieldcpy(dev.sysfs_value, temp3);
 208
 209                         /* NAME="new_name" */
 210                         temp2 = strsep(&temp, ",");
 211                         retval = get_value("NAME", &temp, &temp3);
 212                         if (retval)
 213                                 break;
 214                         strfieldcpy(dev.name, temp3);
 215
 216                         dbg_parse("LABEL name='%s', bus='%s', "
 217                                   "sysfs_file='%s', sysfs_value='%s'",
 218                                   dev.name, dev.bus, dev.sysfs_file,
 219                                   dev.sysfs_value);
 220                 }
 221
 222                 if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
 223                         /* number type */
 224                         dev.type = NUMBER;
 225
 226                         /* BUS="bus" */
 227                         retval = get_value("BUS", &temp, &temp3);
 228                         if (retval)
 229                                 break;
 230                         strfieldcpy(dev.bus, temp3);
 231
 232                         /* ID="id" */
 233                         temp2 = strsep(&temp, ",");
 234                         retval = get_value("ID", &temp, &temp3);
 235                         if (retval)
 236                                 break;
 237                         strfieldcpy(dev.id, temp3);
 238
 239                         /* NAME="new_name" */
 240                         temp2 = strsep(&temp, ",");
 241                         retval = get_value("NAME", &temp, &temp3);
 242                         if (retval)
 243                                 break;
 244                         strfieldcpy(dev.name, temp3);
 245
 246                         dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
 247                                   dev.name, dev.bus, dev.id);
 248                 }
 249
 250                 if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
 251                         /* number type */
 252                         dev.type = TOPOLOGY;
 253
 254                         /* BUS="bus" */
 255                         retval = get_value("BUS", &temp, &temp3);
 256                         if (retval)
 257                                 break;
 258                         strfieldcpy(dev.bus, temp3);
 259
 260                         /* PLACE="place" */
 261                         temp2 = strsep(&temp, ",");
 262                         retval = get_value("PLACE", &temp, &temp3);
 263                         if (retval)
 264                                 break;
 265                         strfieldcpy(dev.place, temp3);
 266
 267                         /* NAME="new_name" */
 268                         temp2 = strsep(&temp, ",");
 269                         retval = get_value("NAME", &temp, &temp3);
 270                         if (retval)
 271                                 break;
 272                         strfieldcpy(dev.name, temp3);
 273
 274                         dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
 275                                   dev.name, dev.bus, dev.place);
 276                 }
 277
 278                 if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
 279                         /* number type */
 280                         dev.type = REPLACE;
 281
 282                         /* KERNEL="kernel_name" */
 283                         retval = get_value("KERNEL", &temp, &temp3);
 284                         if (retval)
 285                                 break;
 286                         strfieldcpy(dev.kernel_name, temp3);
 287
 288                         /* NAME="new_name" */
 289                         temp2 = strsep(&temp, ",");
 290                         retval = get_value("NAME", &temp, &temp3);
 291                         if (retval)
 292                                 break;
 293                         strfieldcpy(dev.name, temp3);
 294                         dbg_parse("REPLACE name='%s', kernel_name='%s'",
 295                                   dev.name, dev.kernel_name);
 296                 }
 297                 if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
 298                         /* number type */
 299                         dev.type = CALLOUT;
 300
 301                         /* BUS="bus" */
 302                         retval = get_value("BUS", &temp, &temp3);
 303                         if (retval)
 304                                 break;
 305                         strfieldcpy(dev.bus, temp3);
 306
 307                         /* PROGRAM="executable" */
 308                         temp2 = strsep(&temp, ",");
 309                         retval = get_value("PROGRAM", &temp, &temp3);
 310                         if (retval)
 311                                 break;
 312                         strfieldcpy(dev.exec_program, temp3);
 313
 314                         /* ID="id" */
 315                         temp2 = strsep(&temp, ",");
 316                         retval = get_value("ID", &temp, &temp3);
 317                         if (retval)
 318                                 break;
 319                         strfieldcpy(dev.id, temp3);
 320
 321                         /* NAME="new_name" */
 322                         temp2 = strsep(&temp, ",");
 323                         retval = get_value("NAME", &temp, &temp3);
 324                         if (retval)
 325                                 break;
 326                         strfieldcpy(dev.name, temp3);
 327                         dbg_parse("CALLOUT name='%s', program='%s'",
 328                                   dev.name, dev.exec_program);
 329                 }
 330
 331                 retval = add_config_dev(&dev);
 332                 if (retval) {
 333                         dbg("add_config_dev returned with error %d", retval);
 334                         goto exit;
 335                 }
 336         }
 337         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_rules_filename,
 338                   lineno, temp - line, temp);
 339 exit:
 340         fclose(fd);
 341         return retval;
 342 }
 343
 344
 345 int namedev_init_permissions(void)
 346 {
 347         char line[255];
 348         char *temp;
 349         char *temp2;
 350         FILE *fd;
 351         int retval = 0;
 352         struct perm_device dev;
 353
 354         fd = fopen(udev_permissions_filename, "r");
 355         if (fd != NULL) {
 356                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 357         } else {
 358                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 359                 return -ENODEV;
 360         }
 361
 362         /* loop through the whole file */
 363         while (1) {
 364                 temp = fgets(line, sizeof(line), fd);
 365                 if (temp == NULL)
 366                         break;
 367
 368                 dbg_parse("read '%s'", temp);
 369
 370                 /* eat the whitespace at the beginning of the line */
 371                 while (isspace(*temp))
 372                         ++temp;
 373
 374                 /* empty line? */
 375                 if (*temp == 0x00)
 376                         continue;
 377
 378                 /* see if this is a comment */
 379                 if (*temp == COMMENT_CHARACTER)
 380                         continue;
 381
 382                 memset(&dev, 0x00, sizeof(dev));
 383
 384                 /* parse the line */
 385                 temp2 = strsep(&temp, ":");
 386                 if (!temp2) {
 387                         dbg("cannot parse line '%s'", line);
 388                         continue;
 389                 }
 390                 strncpy(dev.name, temp2, sizeof(dev.name));
 391
 392                 temp2 = strsep(&temp, ":");
 393                 if (!temp2) {
 394                         dbg("cannot parse line '%s'", line);
 395                         continue;
 396                 }
 397                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 398
 399                 temp2 = strsep(&temp, ":");
 400                 if (!temp2) {
 401                         dbg("cannot parse line '%s'", line);
 402                         continue;
 403                 }
 404                 strncpy(dev.group, temp2, sizeof(dev.owner));
 405
 406                 if (!temp) {
 407                         dbg("cannot parse line: %s", line);
 408                         continue;
 409                 }
 410                 dev.mode = strtol(temp, NULL, 8);
 411
 412                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 413                           dev.name, dev.owner, dev.group,
 414                           dev.mode);
 415                 retval = add_perm_dev(&dev);
 416                 if (retval) {
 417                         dbg("add_config_dev returned with error %d", retval);
 418                         goto exit;
 419                 }
 420         }
 421
 422 exit:
 423         fclose(fd);
 424         return retval;
 425 }
 426
 427