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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 <libeconf.h>
#endif
#include "closestream.h"
#include "shells.h"
#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
static econf_file *open_etc_shells(void)
{
econf_err error;
econf_file *key_file = NULL;
error = econf_readDirs(&key_file,
_PATH_VENDORDIR,
"/etc",
"shells",
NULL,
"", /* key only */
"#" /* comment */);
if (error) {
syslog(LOG_ALERT,
_("Cannot parse shells files: %s"),
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_getKeys(key_file, NULL, &size, &keys);
if (error) {
econf_free(key_file);
errx(EXIT_FAILURE,
_("Cannot evaluate entries in shells files: %s"),
econf_errString(error));
}
for (size_t i = 0; i < size; i++) {
fprintf(out, format, keys[i]);
}
econf_free(keys);
econf_free(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_getStringValue (key_file, NULL, shell_name, &val);
if (error) {
if (error != ECONF_NOKEY)
syslog(LOG_ALERT,
_("Cannot evaluate entries in shells files: %s"),
econf_errString(error));
} else
ret = 1;
free(val);
econf_free(key_file);
#else
char *s;
setusershell();
while ((s = getusershell())) {
if (*s != '#' && strcmp(shell_name, s) == 0) {
ret = 1;
break;
}
}
endusershell();
#endif
return ret;
}
const char *ul_default_shell(int flags, const struct passwd *pw)
{
const char *shell = NULL;
if (!(flags & UL_SHELL_NOENV)) {
shell = getenv("SHELL");
if (shell && *shell)
return shell;
}
if (!(flags & UL_SHELL_NOPWD)) {
if (!pw)
pw = getpwuid(getuid());
if (pw)
shell = pw->pw_shell;
if (shell && *shell)
return shell;
}
return _PATH_BSHELL;
}
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