| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #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; |
| } |