udevrulescompile.c

   1 /*
   2  * udevrulescompile.c - store already parsed config on disk
   3  *
   4  * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  *
  10  *      This program is distributed in the hope that it will be useful, but
  11  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *      General Public License for more details.
  14  *
  15  *      You should have received a copy of the GNU General Public License along
  16  *      with this program; if not, write to the Free Software Foundation, Inc.,
  17  *      675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 #include <stdlib.h>
  22 #include <stddef.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <errno.h>
  27
  28 #include "udev_libc_wrapper.h"
  29 #include "udev_sysfs.h"
  30 #include "udev.h"
  31 #include "udev_version.h"
  32 #include "logging.h"
  33 #include "udev_rules.h"
  34 #include "udev_utils.h"
  35 #include "list.h"
  36
  37 #ifdef USE_LOG
  38 void log_message(int priority, const char *format, ...)
  39 {
  40         va_list args;
  41
  42         if (priority > udev_log_priority)
  43                 return;
  44
  45         va_start(args, format);
  46         vsyslog(priority, format, args);
  47         va_end(args);
  48 }
  49 #endif
  50
  51 int main(int argc, char *argv[], char *envp[])
  52 {
  53         struct udev_rule *rule;
  54         FILE *f;
  55         char comp[PATH_SIZE];
  56         char comp_tmp[PATH_SIZE];
  57         int retval = 0;
  58
  59         logging_init("udevrulescompile");
  60         udev_init_config();
  61         dbg("version %s", UDEV_VERSION);
  62
  63         strlcpy(comp, udev_rules_filename, sizeof(comp));
  64         strlcat(comp, ".compiled", sizeof(comp));
  65         strlcpy(comp_tmp, comp, sizeof(comp_tmp));
  66         strlcat(comp_tmp, ".tmp", sizeof(comp_tmp));
  67
  68         /* remove old version, otherwise we would read it
  69          * instead of the real rules */
  70         unlink(comp);
  71         unlink(comp_tmp);
  72
  73         udev_rules_init();
  74
  75         f = fopen(comp_tmp, "w");
  76         if (f == NULL) {
  77                 err("unable to create db file '%s'", comp_tmp);
  78                 unlink(comp_tmp);
  79                 retval = 1;
  80                 goto exit;
  81         }
  82         dbg("storing compiled rules in '%s'", comp_tmp);
  83
  84         udev_rules_iter_init();
  85         while (1) {
  86                 char *endptr;
  87                 unsigned long id;
  88
  89                 rule = udev_rules_iter_next();
  90                 if (rule == NULL)
  91                         break;
  92
  93                 id = strtoul(rule->owner, &endptr, 10);
  94                 if (endptr[0] != '\0') {
  95                         uid_t uid;
  96
  97                         uid = lookup_user(rule->owner);
  98                         dbg("replacing username='%s' by id=%i", rule->owner, uid);
  99                         sprintf(rule->owner, "%li", uid);
 100                 }
 101
 102                 id = strtoul(rule->group, &endptr, 10);
 103                 if (endptr[0] != '\0') {
 104                         gid_t gid;
 105
 106                         gid = lookup_group(rule->group);
 107                         dbg("replacing groupname='%s' by id=%i", rule->group, gid);
 108                         sprintf(rule->group, "%li", gid);
 109                 }
 110
 111                 dbg("kernel='%s' name='%s'", rule->kernel, rule->name);
 112                 fwrite(rule, sizeof(struct udev_rule), 1, f);
 113         }
 114
 115         fclose(f);
 116         dbg("activating compiled rules in '%s'", comp);
 117         if (rename(comp_tmp, comp) != 0) {
 118                 err("unable to write file");
 119                 unlink(comp);
 120                 unlink(comp_tmp);
 121                 retval = 2;
 122         }
 123
 124 exit:
 125         logging_close();
 126         return retval;
 127 }