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 add_config_dev(struct config_device *new_dev)
  40 {
  41         struct config_device *tmp_dev;
  42
  43         tmp_dev = malloc(sizeof(*tmp_dev));
  44         if (tmp_dev == NULL)
  45                 return -ENOMEM;
  46         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
  47         list_add_tail(&tmp_dev->node, &config_device_list);
  48         //dump_config_dev(tmp_dev);
  49         return 0;
  50 }
  51
  52 int get_pair(char **orig_string, char **left, char **right)
  53 {
  54         char *temp;
  55         char *string = *orig_string;
  56
  57         if (!string)
  58                 return -ENODEV;
  59
  60         /* eat any whitespace */
  61         while (isspace(*string) || *string == ',')
  62                 ++string;
  63
  64         /* split based on '=' */
  65         temp = strsep(&string, "=");
  66         *left = temp;
  67         if (!string)
  68                 return -ENODEV;
  69
  70         /* take the right side and strip off the '"' */
  71         while (isspace(*string))
  72                 ++string;
  73         if (*string == '"')
  74                 ++string;
  75         else
  76                 return -ENODEV;
  77
  78         temp = strsep(&string, "\"");
  79         if (!string || *temp == '\0')
  80                 return -ENODEV;
  81         *right = temp;
  82         *orig_string = string;
  83
  84         return 0;
  85 }
  86
  87 void dump_config_dev(struct config_device *dev)
  88 {
  89         /*FIXME dump all sysfs's */
  90         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  91                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  92                   "kernel='%s', program='%s', result='%s'",
  93                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  94                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  95                   dev->kernel, dev->program, dev->result);
  96 }
  97
  98 void dump_config_dev_list(void)
  99 {
 100         struct config_device *dev;
 101
 102         list_for_each_entry(dev, &config_device_list, node)
 103                 dump_config_dev(dev);
 104 }
 105
 106 void dump_perm_dev(struct perm_device *dev)
 107 {
 108         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 109                   dev->name, dev->owner, dev->group, dev->mode);
 110 }
 111
 112 void dump_perm_dev_list(void)
 113 {
 114         struct perm_device *dev;
 115
 116         list_for_each_entry(dev, &perm_device_list, node)
 117                 dump_perm_dev(dev);
 118 }
 119
 120
 121 int namedev_init_rules(void)
 122 {
 123         char line[255];
 124         int lineno;
 125         char *temp;
 126         char *temp2;
 127         char *temp3;
 128         FILE *fd;
 129         int program_given = 0;
 130         int retval = 0;
 131         struct config_device dev;
 132
 133         fd = fopen(udev_rules_filename, "r");
 134         if (fd != NULL) {
 135                 dbg("reading '%s' as rules file", udev_rules_filename);
 136         } else {
 137                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 138                 return -ENODEV;
 139         }
 140
 141         /* loop through the whole file */
 142         lineno = 0;
 143         while (1) {
 144                 /* get a line */
 145                 temp = fgets(line, sizeof(line), fd);
 146                 if (temp == NULL)
 147                         goto exit;
 148                 lineno++;
 149                 dbg_parse("read '%s'", temp);
 150
 151                 /* eat the whitespace */
 152                 while (isspace(*temp))
 153                         ++temp;
 154
 155                 /* empty line? */
 156                 if ((*temp == '\0') || (*temp == '\n'))
 157                         continue;
 158
 159                 /* see if this is a comment */
 160                 if (*temp == COMMENT_CHARACTER)
 161                         continue;
 162
 163                 memset(&dev, 0x00, sizeof(struct config_device));
 164
 165                 /* get all known keys */
 166                 while (1) {
 167                         retval = get_pair(&temp, &temp2, &temp3);
 168                         if (retval)
 169                                 break;
 170
 171                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 172                                 strfieldcpy(dev.bus, temp3);
 173                                 continue;
 174                         }
 175
 176                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 177                                 strfieldcpy(dev.id, temp3);
 178                                 continue;
 179                         }
 180
 181                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 182                                 strfieldcpy(dev.place, temp3);
 183                                 continue;
 184                         }
 185
 186                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 187                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 188                                 int sysfs_pair_num = 0;
 189
 190                                 /* find first unused pair */
 191                                 while (pair->file[0] != '\0') {
 192                                         ++sysfs_pair_num;
 193                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 194                                                 pair = NULL;
 195                                                 break;
 196                                         }
 197                                         ++pair;
 198                                 }
 199                                 if (pair) {
 200                                         /* remove prepended 'SYSFS_' */
 201                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 202                                         strfieldcpy(pair->value, temp3);
 203                                 }
 204                                 continue;
 205                         }
 206
 207                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 208                                 strfieldcpy(dev.kernel, temp3);
 209                                 continue;
 210                         }
 211
 212                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 213                                 program_given = 1;
 214                                 strfieldcpy(dev.program, temp3);
 215                                 continue;
 216                         }
 217
 218                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 219                                 strfieldcpy(dev.result, temp3);
 220                                 continue;
 221                         }
 222
 223                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 224                                 strfieldcpy(dev.name, temp3);
 225                                 continue;
 226                         }
 227
 228                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 229                                 strfieldcpy(dev.symlink, temp3);
 230                                 continue;
 231                         }
 232
 233                         dbg_parse("unknown type of field '%s'", temp2);
 234                 }
 235
 236                 /* simple plausibility check for given keys */
 237                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 238                     (dev.sysfs_pair[0].value[0] == '\0')) {
 239                         dbg("inconsistency in SYSFS_ key");
 240                         goto error;
 241                 }
 242
 243                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 244                         dbg("RESULT is only useful when PROGRAM called in any rule before");
 245                         goto error;
 246                 }
 247
 248                 retval = add_config_dev(&dev);
 249                 if (retval) {
 250                         dbg("add_config_dev returned with error %d", retval);
 251                         continue;
 252 error:
 253                         dbg("%s:%d:%Zd: parse error, rule skipped",
 254                                   udev_rules_filename, lineno, temp - line);
 255                 }
 256         }
 257 exit:
 258         fclose(fd);
 259         return retval;
 260 }
 261
 262 int namedev_init_permissions(void)
 263 {
 264         char line[255];
 265         char *temp;
 266         char *temp2;
 267         FILE *fd;
 268         int retval = 0;
 269         struct perm_device dev;
 270
 271         fd = fopen(udev_permissions_filename, "r");
 272         if (fd != NULL) {
 273                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 274         } else {
 275                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 276                 return -ENODEV;
 277         }
 278
 279         /* loop through the whole file */
 280         while (1) {
 281                 temp = fgets(line, sizeof(line), fd);
 282                 if (temp == NULL)
 283                         break;
 284
 285                 dbg_parse("read '%s'", temp);
 286
 287                 /* eat the whitespace at the beginning of the line */
 288                 while (isspace(*temp))
 289                         ++temp;
 290
 291                 /* empty line? */
 292                 if ((*temp == '\0') || (*temp == '\n'))
 293                         continue;
 294
 295                 /* see if this is a comment */
 296                 if (*temp == COMMENT_CHARACTER)
 297                         continue;
 298
 299                 memset(&dev, 0x00, sizeof(dev));
 300
 301                 /* parse the line */
 302                 temp2 = strsep(&temp, ":");
 303                 if (!temp2) {
 304                         dbg("cannot parse line '%s'", line);
 305                         continue;
 306                 }
 307                 strncpy(dev.name, temp2, sizeof(dev.name));
 308
 309                 temp2 = strsep(&temp, ":");
 310                 if (!temp2) {
 311                         dbg("cannot parse line '%s'", line);
 312                         continue;
 313                 }
 314                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 315
 316                 temp2 = strsep(&temp, ":");
 317                 if (!temp2) {
 318                         dbg("cannot parse line '%s'", line);
 319                         continue;
 320                 }
 321                 strncpy(dev.group, temp2, sizeof(dev.owner));
 322
 323                 if (!temp) {
 324                         dbg("cannot parse line: %s", line);
 325                         continue;
 326                 }
 327                 dev.mode = strtol(temp, NULL, 8);
 328
 329                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 330                           dev.name, dev.owner, dev.group,
 331                           dev.mode);
 332                 retval = add_perm_dev(&dev);
 333                 if (retval) {
 334                         dbg("add_perm_dev returned with error %d", retval);
 335                         goto exit;
 336                 }
 337         }
 338
 339 exit:
 340         fclose(fd);
 341         return retval;
 342 }
 343
 344