1  /*
       2   * SPDX-License-Identifier: GPL-2.0-or-later
       3   */
       4  #include <sys/syslog.h>
       5  #if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
       6  #include <libeconf.h>
       7  #endif
       8  
       9  #include "closestream.h"
      10  #include "shells.h"
      11  
      12  /*
      13   *  is_known_shell() -- if the given shell appears in /etc/shells
      14   *  or vendor defined files.
      15   *  Return 1 if found and return 0 if not found.
      16   */
      17  extern int is_known_shell(const char *shell_name)
      18  {
      19  	int ret = 0;
      20  
      21  #if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
      22  	size_t size = 0;
      23  	econf_err error;
      24  	char **keys;
      25  	econf_file *key_file;
      26  
      27  	error = econf_readDirs(&key_file,
      28  			       _PATH_VENDORDIR,
      29  			       "/etc",
      30  			       "shells",
      31  			       NULL,
      32  			       "", /* key only */
      33  			       "#" /* comment */);
      34  	if (error) {
      35  		syslog(LOG_ALERT,
      36  		       _("Cannot parse shells files: %s"),
      37  		       econf_errString(error));
      38  		exit(EXIT_FAILURE);
      39  	}
      40  
      41  	error = econf_getKeys(key_file, NULL, &size, &keys);
      42  	if (error) {
      43  		syslog(LOG_ALERT,
      44  		       _("Cannot evaluate entries in shells files: %s"),
      45  		       econf_errString(error));
      46  		econf_free (key_file);
      47  		exit(EXIT_FAILURE);
      48  	}
      49  
      50  	for (size_t i = 0; i < size; i++) {
      51  		if (strcmp (keys[i], shell_name) == 0) {
      52  			ret = 1;
      53  			break;
      54  		}
      55  	}
      56  	econf_free (key_file);	
      57  #else
      58  	char *s;
      59  
      60  	if (!shell_name)
      61  		return 0;
      62  
      63  	setusershell();
      64  	while ((s = getusershell())) {
      65  		if (*s != '#' && strcmp(shell_name, s) == 0) {
      66  			ret = 1;
      67  			break;
      68  		}
      69  	}
      70  	endusershell();
      71  #endif
      72  	return ret;
      73  }
      74