/*
* Restart the smb service.
*/
int
smb_smf_restart_service(void)
{
return (smf_restart_instance(SMBD_DEFAULT_INSTANCE_FMRI));
}
/*
* _nscd_restart_if_cfgfile_changed()
* Restart if modification times of nsswitch.conf or resolv.conf have changed.
*
* If nsswitch.conf has changed then it is possible that sources for
* various backends have changed and therefore the current cached
* data may not be consistent with the new data sources. By
* restarting the cache will be cleared and the new configuration will
* be used.
*
* The check for resolv.conf is made as only the first call to
* res_gethostbyname() or res_getaddrbyname() causes a call to
* res_ninit() to occur which in turn parses resolv.conf. Therefore
* to benefit from changes to resolv.conf nscd must be restarted when
* resolv.conf is updated, removed or created. If res_getXbyY calls
* are removed from NSS then this check could be removed.
*
*/
void
_nscd_restart_if_cfgfile_changed()
{
static mutex_t nsswitch_lock = DEFAULTMUTEX;
static timestruc_t last_nsswitch_check = { 0 };
static timestruc_t last_nsswitch_modified = { 0 };
static timestruc_t last_resolv_modified = { -1, 0 };
static mutex_t restarting_lock = DEFAULTMUTEX;
static int restarting = 0;
int restart = 0;
time_t now = time(NULL);
char *me = "_nscd_restart_if_cfgfile_changed";
#define FLAG_RESTART_REQUIRED if (restarting == 0) {\
(void) mutex_lock(&restarting_lock);\
if (restarting == 0) {\
restarting = 1;\
restart = 1;\
}\
(void) mutex_unlock(&restarting_lock);\
}
if (restarting == 1)
return;
if (now - last_nsswitch_check.tv_sec < _NSC_FILE_CHECK_TIME)
return;
(void) mutex_lock(&nsswitch_lock);
if (now - last_nsswitch_check.tv_sec >= _NSC_FILE_CHECK_TIME) {
struct stat nss_buf;
struct stat res_buf;
last_nsswitch_check.tv_sec = now;
last_nsswitch_check.tv_nsec = 0;
(void) mutex_unlock(&nsswitch_lock); /* let others continue */
if (stat("/etc/nsswitch.conf", &nss_buf) < 0) {
return;
} else if (last_nsswitch_modified.tv_sec == 0) {
last_nsswitch_modified = nss_buf.st_mtim;
}
if (last_nsswitch_modified.tv_sec < nss_buf.st_mtim.tv_sec ||
(last_nsswitch_modified.tv_sec == nss_buf.st_mtim.tv_sec &&
last_nsswitch_modified.tv_nsec < nss_buf.st_mtim.tv_nsec)) {
FLAG_RESTART_REQUIRED;
}
if (restart == 0) {
if (stat("/etc/resolv.conf", &res_buf) < 0) {
/* Unable to stat file, were we previously? */
if (last_resolv_modified.tv_sec > 0) {
/* Yes, it must have been removed. */
FLAG_RESTART_REQUIRED;
} else if (last_resolv_modified.tv_sec == -1) {
/* No, then we've never seen it. */
last_resolv_modified.tv_sec = 0;
}
} else if (last_resolv_modified.tv_sec == -1) {
/* We've just started and file is present. */
last_resolv_modified = res_buf.st_mtim;
} else if (last_resolv_modified.tv_sec == 0) {
/* Wasn't there at start-up. */
FLAG_RESTART_REQUIRED;
} else if (last_resolv_modified.tv_sec <
res_buf.st_mtim.tv_sec ||
(last_resolv_modified.tv_sec ==
res_buf.st_mtim.tv_sec &&
last_resolv_modified.tv_nsec <
res_buf.st_mtim.tv_nsec)) {
FLAG_RESTART_REQUIRED;
}
}
if (restart == 1) {
char *fmri;
/*
* if in self cred mode, kill the forker and
* child nscds
*/
if (_nscd_is_self_cred_on(0, NULL)) {
_nscd_kill_forker();
_nscd_kill_all_children();
}
/*
* time for restart
*/
_NSCD_LOG(NSCD_LOG_FRONT_END, NSCD_LOG_LEVEL_INFO)
(me, "nscd restart due to %s or %s change\n",
"/etc/nsswitch.conf", "resolv.conf");
/*
* try to restart under smf
*/
if ((fmri = getenv("SMF_FMRI")) == NULL) {
/* not running under smf - reexec */
(void) execv(main_execname, main_argv);
exit(1); /* just in case */
}
if (smf_restart_instance(fmri) == 0)
(void) sleep(10); /* wait a bit */
exit(1); /* give up waiting for resurrection */
}
} else
(void) mutex_unlock(&nsswitch_lock);
}
