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/*

* SPDX-License-Identifier: GPL-2.0-or-later

*/

#include <sys/types.h>

#include <pwd.h>

#include <stdlib.h>

#include <paths.h>

#include <unistd.h>

#include <sys/syslog.h>

#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)

#include "dl-econf.h"

#endif

#include "closestream.h"

#include "shells.h"

#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)

econf_file *open_etc_shells(void)

{

econf_err error;

econf_file *key_file = NULL;

if (ul_dlopen_libeconf() != 0)

return NULL;

error = econf_call(econf_readDirs)(&key_file,

_PATH_VENDORDIR,

"/etc",

"shells",

NULL,

"", /* key only */

"#" /* comment */);

if (error) {

syslog(LOG_ALERT,

_("Cannot parse shells files: %s"),

econf_call(econf_errString)(error));

return NULL;

}

return key_file;

}

#endif

/*

* print_shells () -- /etc/shells is outputted to stdout.

*/

extern void print_shells(FILE *out, const char *format)

{

#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)

size_t size = 0;

econf_err error;

char **keys = NULL;

econf_file *key_file = open_etc_shells();

if (!key_file)

return;

error = econf_call(econf_getKeys)(key_file, NULL, &size, &keys);

if (error) {

econf_call(econf_freeFile)(key_file);

errx(EXIT_FAILURE,

_("Cannot evaluate entries in shells files: %s"),

econf_call(econf_errString)(error));

}

for (size_t i = 0; i < size; i++) {

fprintf(out, format, keys[i]);

}

econf_call(econf_freeArray)(keys);

econf_call(econf_freeFile)(key_file);

#else

char *s;

setusershell();

while ((s = getusershell()))

fprintf(out, format, s);

endusershell();

#endif

}

/*

* is_known_shell() -- if the given shell appears in /etc/shells

* or vendor defined files.

* Return 1 if found and return 0 if not found.

*/

extern int is_known_shell(const char *shell_name)

{

int ret = 0;

if (!shell_name)

return 0;

#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)

char *val = NULL;

econf_err error;

econf_file *key_file = open_etc_shells();

if (!key_file)

return 0;

error = econf_call(econf_getStringValue) (key_file, NULL, shell_name, &val);

if (error) {

if (error != ECONF_NOKEY)

syslog(LOG_ALERT,

_("Cannot evaluate entries in shells files: %s"),

econf_call(econf_errString)(error));

} else

ret = 1;

free(val);

econf_call(econf_freeFile)(key_file);

#else

char *s;

setusershell();

while ((s = getusershell())) {

if (*s != '#' && strcmp(shell_name, s) == 0) {

ret = 1;

break;

}

}

endusershell();

#endif

return ret;

}