static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
BusName *n = BUSNAME(userdata);
assert(n);
assert(n->timer_event_source == source);
switch (n->state) {
case BUSNAME_MAKING:
log_unit_warning(UNIT(n)->id, "%s making timed out. Terminating.", UNIT(n)->id);
busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT);
break;
case BUSNAME_SIGTERM:
log_unit_warning(UNIT(n)->id, "%s stopping timed out. Killing.", UNIT(n)->id);
busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT);
break;
case BUSNAME_SIGKILL:
log_unit_warning(UNIT(n)->id, "%s still around after SIGKILL. Ignoring.", UNIT(n)->id);
busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
return 0;
}
static void busname_trigger_notify(Unit *u, Unit *other) {
BusName *n = BUSNAME(u);
assert(n);
assert(other);
if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING))
return;
if (other->start_limit_hit) {
busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT);
return;
}
if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
return;
if (IN_SET(SERVICE(other)->state,
SERVICE_DEAD, SERVICE_FAILED,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
SERVICE_AUTO_RESTART))
busname_enter_listening(n);
if (SERVICE(other)->state == SERVICE_RUNNING)
busname_set_state(n, BUSNAME_RUNNING);
}
static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) {
KillContext kill_context = {};
int r;
assert(n);
if (f != BUSNAME_SUCCESS)
n->result = f;
kill_context_init(&kill_context);
r = unit_kill_context(UNIT(n),
&kill_context,
state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE,
-1,
n->control_pid,
false);
if (r < 0) {
log_unit_warning_errno(UNIT(n)->id, r, "%s failed to kill control process: %m", UNIT(n)->id);
goto fail;
}
if (r > 0) {
r = busname_arm_timer(n);
if (r < 0) {
log_unit_warning_errno(UNIT(n)->id, r, "%s failed to arm timer: %m", UNIT(n)->id);
goto fail;
}
busname_set_state(n, state);
} else if (state == BUSNAME_SIGTERM)
busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS);
else
busname_enter_dead(n, BUSNAME_SUCCESS);
return;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
}
static void busname_enter_running(BusName *n) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
bool pending = false;
Unit *other;
Iterator i;
int r;
assert(n);
if (!n->activating)
return;
/* We don't take connections anymore if we are supposed to
* shut down anyway */
if (unit_stop_pending(UNIT(n))) {
log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled.");
/* Flush all queued activation reqeuest by closing and reopening the connection */
bus_kernel_drop_one(n->starter_fd);
busname_enter_listening(n);
return;
}
/* If there's already a start pending don't bother to do
* anything */
SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i)
if (unit_active_or_pending(other)) {
pending = true;
break;
}
if (!pending) {
if (!UNIT_ISSET(n->service)) {
log_unit_error(UNIT(n), "Service to activate vanished, refusing activation.");
r = -ENOENT;
goto fail;
}
r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, &error, NULL);
if (r < 0)
goto fail;
}
busname_set_state(n, BUSNAME_RUNNING);
return;
fail:
log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r));
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
}
static int busname_start(Unit *u) {
BusName *n = BUSNAME(u);
int r;
assert(n);
/* We cannot fulfill this request right now, try again later
* please! */
if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL))
return -EAGAIN;
/* Already on it! */
if (n->state == BUSNAME_MAKING)
return 0;
if (n->activating && UNIT_ISSET(n->service)) {
Service *service;
service = SERVICE(UNIT_DEREF(n->service));
if (UNIT(service)->load_state != UNIT_LOADED) {
log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id);
return -ENOENT;
}
}
assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED));
r = unit_start_limit_test(u);
if (r < 0) {
busname_enter_dead(n, BUSNAME_FAILURE_START_LIMIT_HIT);
return r;
}
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
n->result = BUSNAME_SUCCESS;
busname_enter_making(n);
return 1;
}
static void busname_enter_making(BusName *n) {
int r;
assert(n);
r = busname_open_fd(n);
if (r < 0)
goto fail;
if (n->policy) {
/* If there is a policy, we need to resolve user/group
* names, which we can't do from PID1, hence let's
* fork. */
busname_unwatch_control_pid(n);
r = busname_make_starter(n, &n->control_pid);
if (r < 0) {
log_unit_warning_errno(UNIT(n)->id, r, "%s failed to fork 'making' task: %m", UNIT(n)->id);
goto fail;
}
busname_set_state(n, BUSNAME_MAKING);
} else {
/* If there is no policy, we can do everything
* directly from PID 1, hence do so. */
r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world);
if (r < 0) {
log_unit_warning_errno(UNIT(n)->id, r, "%s failed to make starter: %m", UNIT(n)->id);
goto fail;
}
busname_enter_listening(n);
}
return;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
}
static int busname_stop(Unit *u) {
BusName *n = BUSNAME(u);
assert(n);
/* Already on it */
if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL))
return 0;
/* If there's already something running, we go directly into
* kill mode. */
if (n->state == BUSNAME_MAKING) {
busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS);
return -EAGAIN;
}
assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING));
busname_enter_dead(n, BUSNAME_SUCCESS);
return 1;
}
static void busname_trigger_notify(Unit *u, Unit *other) {
BusName *n = BUSNAME(u);
Service *s;
assert(n);
assert(other);
if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING))
return;
if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
return;
s = SERVICE(other);
if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT)
busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT);
else if (IN_SET(s->state,
SERVICE_DEAD, SERVICE_FAILED,
SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
SERVICE_AUTO_RESTART))
busname_enter_listening(n);
}
static int busname_peek_message(BusName *n) {
struct kdbus_cmd_recv cmd_recv = {
.size = sizeof(cmd_recv),
.flags = KDBUS_RECV_PEEK,
};
struct kdbus_cmd_free cmd_free = {
.size = sizeof(cmd_free),
};
const char *comm = NULL;
struct kdbus_item *d;
struct kdbus_msg *k;
size_t start, ps, sz, delta;
void *p = NULL;
pid_t pid = 0;
int r;
/* Generate a friendly debug log message about which process
* caused triggering of this bus name. This simply peeks the
* metadata of the first queued message and logs it. */
assert(n);
/* Let's shortcut things a bit, if debug logging is turned off
* anyway. */
if (log_get_max_level() < LOG_DEBUG)
return 0;
r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
return 0;
log_unit_error(UNIT(n)->id, "%s: Failed to query activation message: %m", UNIT(n)->id);
return -errno;
}
/* We map as late as possible, and unmap imemdiately after
* use. On 32bit address space is scarce and we want to be
* able to handle a lot of activator connections at the same
* time, and hence shouldn't keep the mmap()s around for
* longer than necessary. */
ps = page_size();
start = (cmd_recv.msg.offset / ps) * ps;
delta = cmd_recv.msg.offset - start;
sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size);
p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start);
if (p == MAP_FAILED) {
log_unit_error(UNIT(n)->id, "%s: Failed to map activation message: %m", UNIT(n)->id);
r = -errno;
goto finish;
}
k = (struct kdbus_msg *) ((uint8_t *) p + delta);
KDBUS_ITEM_FOREACH(d, k, items) {
switch (d->type) {
case KDBUS_ITEM_PIDS:
pid = d->pids.pid;
break;
case KDBUS_ITEM_PID_COMM:
comm = d->str;
break;
}
}
if (pid > 0)
log_unit_debug(UNIT(n)->id, "%s: Activation triggered by process " PID_FMT " (%s)", UNIT(n)->id, pid, strna(comm));
r = 0;
finish:
if (p)
(void) munmap(p, sz);
cmd_free.offset = cmd_recv.msg.offset;
if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0)
log_unit_warning(UNIT(n)->id, "Failed to free peeked message, ignoring: %m");
return r;
}
static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
BusName *n = userdata;
assert(n);
assert(fd >= 0);
if (n->state != BUSNAME_LISTENING)
return 0;
log_unit_debug(UNIT(n)->id, "Activation request on %s", UNIT(n)->id);
if (revents != EPOLLIN) {
log_unit_error(UNIT(n)->id, "%s: Got unexpected poll event (0x%x) on starter fd.",
UNIT(n)->id, revents);
goto fail;
}
busname_peek_message(n);
busname_enter_running(n);
return 0;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
return 0;
}
static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) {
BusName *n = BUSNAME(u);
BusNameResult f;
assert(n);
assert(pid >= 0);
if (pid != n->control_pid)
return;
n->control_pid = 0;
if (is_clean_exit(code, status, NULL))
f = BUSNAME_SUCCESS;
else if (code == CLD_EXITED)
f = BUSNAME_FAILURE_EXIT_CODE;
else if (code == CLD_KILLED)
f = BUSNAME_FAILURE_SIGNAL;
else if (code == CLD_DUMPED)
f = BUSNAME_FAILURE_CORE_DUMP;
else
assert_not_reached("Unknown sigchld code");
log_unit_full(u->id,
f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
"%s control process exited, code=%s status=%i",
u->id, sigchld_code_to_string(code), status);
if (f != BUSNAME_SUCCESS)
n->result = f;
switch (n->state) {
case BUSNAME_MAKING:
if (f == BUSNAME_SUCCESS)
busname_enter_listening(n);
else
busname_enter_signal(n, BUSNAME_SIGTERM, f);
break;
case BUSNAME_SIGTERM:
case BUSNAME_SIGKILL:
busname_enter_dead(n, f);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
}
