namedev_parse.c

   1 /*
   2  * namedev_parse.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003,2004 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 void dump_config_dev(struct config_device *dev)
  56 {
  57         /*FIXME dump all sysfs's */
  58         dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', "
  59                   "sysfs_file[0]='%s', sysfs_value[0]='%s', "
  60                   "kernel='%s', program='%s', result='%s'",
  61                   dev->name, dev->symlink, dev->bus, dev->place, dev->id,
  62                   dev->sysfs_pair[0].file, dev->sysfs_pair[0].value,
  63                   dev->kernel, dev->program, dev->result);
  64 }
  65
  66 void dump_config_dev_list(void)
  67 {
  68         struct config_device *dev;
  69
  70         list_for_each_entry(dev, &config_device_list, node)
  71                 dump_config_dev(dev);
  72 }
  73
  74 void dump_perm_dev(struct perm_device *dev)
  75 {
  76         dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
  77                   dev->name, dev->owner, dev->group, dev->mode);
  78 }
  79
  80 void dump_perm_dev_list(void)
  81 {
  82         struct perm_device *dev;
  83
  84         list_for_each_entry(dev, &perm_device_list, node)
  85                 dump_perm_dev(dev);
  86 }
  87
  88 int namedev_init_rules(void)
  89 {
  90         char line[255];
  91         int lineno;
  92         char *temp;
  93         char *temp2;
  94         char *temp3;
  95         FILE *fd;
  96         int program_given = 0;
  97         int retval = 0;
  98         struct config_device dev;
  99
 100         fd = fopen(udev_rules_filename, "r");
 101         if (fd != NULL) {
 102                 dbg("reading '%s' as rules file", udev_rules_filename);
 103         } else {
 104                 dbg("can't open '%s' as a rules file", udev_rules_filename);
 105                 return -ENODEV;
 106         }
 107
 108         /* loop through the whole file */
 109         lineno = 0;
 110         while (1) {
 111                 /* get a line */
 112                 temp = fgets(line, sizeof(line), fd);
 113                 if (temp == NULL)
 114                         goto exit;
 115                 lineno++;
 116                 dbg_parse("read '%s'", temp);
 117
 118                 /* eat the whitespace */
 119                 while (isspace(*temp))
 120                         ++temp;
 121
 122                 /* empty line? */
 123                 if ((*temp == '\0') || (*temp == '\n'))
 124                         continue;
 125
 126                 /* see if this is a comment */
 127                 if (*temp == COMMENT_CHARACTER)
 128                         continue;
 129
 130                 memset(&dev, 0x00, sizeof(struct config_device));
 131
 132                 /* get all known keys */
 133                 while (1) {
 134                         retval = parse_get_pair(&temp, &temp2, &temp3);
 135                         if (retval)
 136                                 break;
 137
 138                         if (strcasecmp(temp2, FIELD_BUS) == 0) {
 139                                 strfieldcpy(dev.bus, temp3);
 140                                 continue;
 141                         }
 142
 143                         if (strcasecmp(temp2, FIELD_ID) == 0) {
 144                                 strfieldcpy(dev.id, temp3);
 145                                 continue;
 146                         }
 147
 148                         if (strcasecmp(temp2, FIELD_PLACE) == 0) {
 149                                 strfieldcpy(dev.place, temp3);
 150                                 continue;
 151                         }
 152
 153                         if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
 154                                 struct sysfs_pair *pair = &dev.sysfs_pair[0];
 155                                 int sysfs_pair_num = 0;
 156
 157                                 /* find first unused pair */
 158                                 while (pair->file[0] != '\0') {
 159                                         ++sysfs_pair_num;
 160                                         if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
 161                                                 pair = NULL;
 162                                                 break;
 163                                         }
 164                                         ++pair;
 165                                 }
 166                                 if (pair) {
 167                                         /* remove prepended 'SYSFS_' */
 168                                         strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
 169                                         strfieldcpy(pair->value, temp3);
 170                                 }
 171                                 continue;
 172                         }
 173
 174                         if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
 175                                 strfieldcpy(dev.kernel, temp3);
 176                                 continue;
 177                         }
 178
 179                         if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
 180                                 program_given = 1;
 181                                 strfieldcpy(dev.program, temp3);
 182                                 continue;
 183                         }
 184
 185                         if (strcasecmp(temp2, FIELD_RESULT) == 0) {
 186                                 strfieldcpy(dev.result, temp3);
 187                                 continue;
 188                         }
 189
 190                         if (strcasecmp(temp2, FIELD_NAME) == 0) {
 191                                 strfieldcpy(dev.name, temp3);
 192                                 continue;
 193                         }
 194
 195                         if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
 196                                 strfieldcpy(dev.symlink, temp3);
 197                                 continue;
 198                         }
 199
 200                         dbg("unknown type of field '%s'", temp2);
 201                         dbg("You might be using a rules file in the old format, please fix.");
 202                         goto error;
 203                 }
 204
 205                 /* simple plausibility check for given keys */
 206                 if ((dev.sysfs_pair[0].file[0] == '\0') ^
 207                     (dev.sysfs_pair[0].value[0] == '\0')) {
 208                         dbg("inconsistency in SYSFS_ key");
 209                         goto error;
 210                 }
 211
 212                 if ((dev.result[0] != '\0') && (program_given == 0)) {
 213                         dbg("RESULT is only useful when PROGRAM called in any rule before");
 214                         goto error;
 215                 }
 216
 217                 dev.config_line = lineno;
 218                 retval = add_config_dev(&dev);
 219                 if (retval) {
 220                         dbg("add_config_dev returned with error %d", retval);
 221                         continue;
 222 error:
 223                         dbg("%s:%d:%d: parse error, rule skipped",
 224                                   udev_rules_filename, lineno, temp - line);
 225                 }
 226         }
 227 exit:
 228         fclose(fd);
 229         return retval;
 230 }
 231
 232 int namedev_init_permissions(void)
 233 {
 234         char line[255];
 235         char *temp;
 236         char *temp2;
 237         FILE *fd;
 238         int retval = 0;
 239         struct perm_device dev;
 240
 241         fd = fopen(udev_permissions_filename, "r");
 242         if (fd != NULL) {
 243                 dbg("reading '%s' as permissions file", udev_permissions_filename);
 244         } else {
 245                 dbg("can't open '%s' as permissions file", udev_permissions_filename);
 246                 return -ENODEV;
 247         }
 248
 249         /* loop through the whole file */
 250         while (1) {
 251                 temp = fgets(line, sizeof(line), fd);
 252                 if (temp == NULL)
 253                         break;
 254
 255                 dbg_parse("read '%s'", temp);
 256
 257                 /* eat the whitespace at the beginning of the line */
 258                 while (isspace(*temp))
 259                         ++temp;
 260
 261                 /* empty line? */
 262                 if ((*temp == '\0') || (*temp == '\n'))
 263                         continue;
 264
 265                 /* see if this is a comment */
 266                 if (*temp == COMMENT_CHARACTER)
 267                         continue;
 268
 269                 memset(&dev, 0x00, sizeof(dev));
 270
 271                 /* parse the line */
 272                 temp2 = strsep(&temp, ":");
 273                 if (!temp2) {
 274                         dbg("cannot parse line '%s'", line);
 275                         continue;
 276                 }
 277                 strncpy(dev.name, temp2, sizeof(dev.name));
 278
 279                 temp2 = strsep(&temp, ":");
 280                 if (!temp2) {
 281                         dbg("cannot parse line '%s'", line);
 282                         continue;
 283                 }
 284                 strncpy(dev.owner, temp2, sizeof(dev.owner));
 285
 286                 temp2 = strsep(&temp, ":");
 287                 if (!temp2) {
 288                         dbg("cannot parse line '%s'", line);
 289                         continue;
 290                 }
 291                 strncpy(dev.group, temp2, sizeof(dev.group));
 292
 293                 if (!temp) {
 294                         dbg("cannot parse line: %s", line);
 295                         continue;
 296                 }
 297                 dev.mode = strtol(temp, NULL, 8);
 298
 299                 dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
 300                           dev.name, dev.owner, dev.group,
 301                           dev.mode);
 302                 retval = add_perm_dev(&dev);
 303                 if (retval) {
 304                         dbg("add_perm_dev returned with error %d", retval);
 305                         goto exit;
 306                 }
 307         }
 308
 309 exit:
 310         fclose(fd);
 311         return retval;
 312 }
 313