lib/shells.c

   1
   2 #include <sys/syslog.h>
   3 #if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
   4 #include <libeconf.h>
   5 #endif
   6
   7 #include "closestream.h"
   8 #include "shells.h"
   9
  10 /*
  11  *  is_known_shell() -- if the given shell appears in /etc/shells
  12  *  or vendor defined files.
  13  *  Return 1 if found and return 0 if not found.
  14  */
  15 extern int is_known_shell(const char *shell_name)
  16 {
  17         int ret = 0;
  18
  19 #if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
  20         size_t size = 0;
  21         econf_err error;
  22         char **keys;
  23         econf_file *key_file;
  24
  25         error = econf_readDirs(&key_file,
  26                                _PATH_VENDORDIR,
  27                                "/etc",
  28                                "shells",
  29                                NULL,
  30                                "", /* key only */
  31                                "#" /* comment */);
  32         if (error) {
  33                 syslog(LOG_ALERT,
  34                        _("Cannot parse shells files: %s"),
  35                        econf_errString(error));
  36                 exit(EXIT_FAILURE);
  37         }
  38
  39         error = econf_getKeys(key_file, NULL, &size, &keys);
  40         if (error) {
  41                 syslog(LOG_ALERT,
  42                        _("Cannot evaluate entries in shells files: %s"),
  43                        econf_errString(error));
  44                 econf_free (key_file);
  45                 exit(EXIT_FAILURE);
  46         }
  47
  48         for (size_t i = 0; i < size; i++) {
  49                 if (strcmp (keys[i], shell_name) == 0) {
  50                         ret = 1;
  51                         break;
  52                 }
  53         }
  54         econf_free (key_file);
  55 #else
  56         char *s;
  57
  58         if (!shell_name)
  59                 return 0;
  60
  61         setusershell();
  62         while ((s = getusershell())) {
  63                 if (*s != '#' && strcmp(shell_name, s) == 0) {
  64                         ret = 1;
  65                         break;
  66                 }
  67         }
  68         endusershell();
  69 #endif
  70         return ret;
  71 }
  72