/* SPDX-License-Identifier: LGPL-2.1+ */
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-internal.h"
#include "bus-util.h"
#include "dbus-cgroup.h"
#include "dbus-kill.h"
#include "dbus-scope.h"
#include "dbus-unit.h"
#include "dbus-util.h"
#include "dbus.h"
#include "scope.h"
#include "selinux-access.h"
#include "unit.h"
static int bus_scope_abandon(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Scope *s = userdata;
int r;
assert(message);
assert(s);
r = mac_selinux_unit_access_check(UNIT(s), message, "stop", error);
if (r < 0)
return r;
r = bus_verify_manage_units_async(UNIT(s)->manager, message, error);
if (r < 0)
return r;
if (r == 0)
return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
r = scope_abandon(s);
if (r == -ESTALE)
return sd_bus_error_setf(error, BUS_ERROR_SCOPE_NOT_RUNNING, "Scope %s is not running, cannot abandon.", UNIT(s)->id);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, scope_result, ScopeResult);
const sd_bus_vtable bus_scope_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Controller", "s", NULL, offsetof(Scope, controller), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("TimeoutStopUSec", "t", bus_property_get_usec, offsetof(Scope, timeout_stop_usec), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Scope, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_SIGNAL("RequestStop", NULL, 0),
SD_BUS_METHOD("Abandon", NULL, NULL, bus_scope_abandon, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END
};
static int bus_scope_set_transient_property(
Scope *s,
const char *name,
sd_bus_message *message,
UnitWriteFlags flags,
sd_bus_error *error) {
int r;
assert(s);
assert(name);
assert(message);
flags |= UNIT_PRIVATE;
if (streq(name, "TimeoutStopUSec"))
return bus_set_transient_usec(UNIT(s), name, &s->timeout_stop_usec, message, flags, error);
if (streq(name, "PIDs")) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
unsigned n = 0;
r = sd_bus_message_enter_container(message, 'a', "u");
if (r < 0)
return r;
for (;;) {
uint32_t upid;
pid_t pid;
r = sd_bus_message_read(message, "u", &upid);
if (r < 0)
return r;
if (r == 0)
break;
if (upid == 0) {
if (!creds) {
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
}
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return r;
} else
pid = (uid_t) upid;
r = unit_pid_attachable(UNIT(s), pid, error);
if (r < 0)
return r;
if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
r = unit_watch_pid(UNIT(s), pid);
if (r < 0 && r != -EEXIST)
return r;
}
n++;
}
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
if (n <= 0)
return -EINVAL;
return 1;
} else if (streq(name, "Controller")) {
const char *controller;
/* We can't support direct connections with this, as direct connections know no service or unique name
* concept, but the Controller field stores exactly that. */
if (sd_bus_message_get_bus(message) != UNIT(s)->manager->api_bus)
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Sorry, Controller= logic only supported via the bus.");
r = sd_bus_message_read(message, "s", &controller);
if (r < 0)
return r;
if (!isempty(controller) && !service_name_is_valid(controller))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Controller '%s' is not a valid bus name.", controller);
if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
r = free_and_strdup(&s->controller, empty_to_null(controller));
if (r < 0)
return r;
}
return 1;
}
return 0;
}
int bus_scope_set_property(
Unit *u,
const char *name,
sd_bus_message *message,
UnitWriteFlags flags,
sd_bus_error *error) {
Scope *s = SCOPE(u);
int r;
assert(s);
assert(name);
assert(message);
r = bus_cgroup_set_property(u, &s->cgroup_context, name, message, flags, error);
if (r != 0)
return r;
if (u->load_state == UNIT_STUB) {
/* While we are created we still accept PIDs */
r = bus_scope_set_transient_property(s, name, message, flags, error);
if (r != 0)
return r;
r = bus_kill_context_set_transient_property(u, &s->kill_context, name, message, flags, error);
if (r != 0)
return r;
}
return 0;
}
int bus_scope_commit_properties(Unit *u) {
assert(u);
unit_update_cgroup_members_masks(u);
unit_realize_cgroup(u);
return 0;
}
int bus_scope_send_request_stop(Scope *s) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_free_ char *p = NULL;
int r;
assert(s);
if (!s->controller)
return 0;
p = unit_dbus_path(UNIT(s));
if (!p)
return -ENOMEM;
r = sd_bus_message_new_signal(
UNIT(s)->manager->api_bus,
&m,
p,
"org.freedesktop.systemd1.Scope",
"RequestStop");
if (r < 0)
return r;
return sd_bus_send_to(UNIT(s)->manager->api_bus, m, s->controller, NULL);
}
static int on_controller_gone(sd_bus_track *track, void *userdata) {
Scope *s = userdata;
assert(track);
if (s->controller) {
log_unit_debug(UNIT(s), "Controller %s disappeared from bus.", s->controller);
unit_add_to_dbus_queue(UNIT(s));
s->controller = mfree(s->controller);
}
s->controller_track = sd_bus_track_unref(s->controller_track);
return 0;
}
int bus_scope_track_controller(Scope *s) {
int r;
assert(s);
if (!s->controller || s->controller_track)
return 0;
r = sd_bus_track_new(UNIT(s)->manager->api_bus, &s->controller_track, on_controller_gone, s);
if (r < 0)
return r;
r = sd_bus_track_add_name(s->controller_track, s->controller);
if (r < 0) {
s->controller_track = sd_bus_track_unref(s->controller_track);
return r;
}
return 0;
}