/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 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 <errno.h> #include "dbus.h" #include "log.h" #include "dbus-unit.h" #include "bus-errors.h" #include "dbus-common.h" #include "selinux-access.h" #include "cgroup-util.h" #include "strv.h" #include "path-util.h" #include "fileio.h" const char bus_unit_interface[] _introspect_("Unit") = BUS_UNIT_INTERFACE; #define INVALIDATING_PROPERTIES \ "LoadState\0" \ "ActiveState\0" \ "SubState\0" \ "InactiveExitTimestamp\0" \ "ActiveEnterTimestamp\0" \ "ActiveExitTimestamp\0" \ "InactiveEnterTimestamp\0" \ "Job\0" \ "NeedDaemonReload\0" static int bus_unit_append_names(DBusMessageIter *i, const char *property, void *data) { char *t; Iterator j; DBusMessageIter sub; Unit *u = data; if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) return -ENOMEM; SET_FOREACH(t, u->names, j) if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t)) return -ENOMEM; if (!dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static int bus_unit_append_following(DBusMessageIter *i, const char *property, void *data) { Unit *u = data, *f; const char *d; assert(i); assert(property); assert(u); f = unit_following(u); d = f ? f->id : ""; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d)) return -ENOMEM; return 0; } static int bus_unit_append_dependencies(DBusMessageIter *i, const char *property, void *data) { Unit *u; Iterator j; DBusMessageIter sub; Set *s = data; if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) return -ENOMEM; SET_FOREACH(u, s, j) if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &u->id)) return -ENOMEM; if (!dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static int bus_unit_append_description(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *d; assert(i); assert(property); assert(u); d = unit_description(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d)) return -ENOMEM; return 0; } static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_unit_append_load_state, unit_load_state, UnitLoadState); static int bus_unit_append_active_state(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *state; assert(i); assert(property); assert(u); state = unit_active_state_to_string(unit_active_state(u)); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) return -ENOMEM; return 0; } static int bus_unit_append_sub_state(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *state; assert(i); assert(property); assert(u); state = unit_sub_state_to_string(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) return -ENOMEM; return 0; } static int bus_unit_append_file_state(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *state; assert(i); assert(property); assert(u); state = strempty(unit_file_state_to_string(unit_get_unit_file_state(u))); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) return -ENOMEM; return 0; } static int bus_unit_append_can_start(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(i); assert(property); assert(u); b = unit_can_start(u) && !u->refuse_manual_start; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_can_stop(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(i); assert(property); assert(u); /* On the lower levels we assume that every unit we can start * we can also stop */ b = unit_can_start(u) && !u->refuse_manual_stop; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_can_reload(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(i); assert(property); assert(u); b = unit_can_reload(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_can_isolate(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(i); assert(property); assert(u); b = unit_can_isolate(u) && !u->refuse_manual_start; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_job(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; DBusMessageIter sub; _cleanup_free_ char *p = NULL; assert(i); assert(property); assert(u); if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) return -ENOMEM; if (u->job) { p = job_dbus_path(u->job); if (!p) return -ENOMEM; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->job->id) || !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) return -ENOMEM; } else { uint32_t id = 0; /* No job, so let's fill in some placeholder * data. Since we need to fill in a valid path we * simple point to ourselves. */ p = unit_dbus_path(u); if (!p) return -ENOMEM; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) || !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) return -ENOMEM; } if (!dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static int bus_unit_append_default_cgroup(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; char *t; CGroupBonding *cgb; bool success; assert(i); assert(property); assert(u); cgb = unit_get_default_cgroup(u); if (cgb) { t = cgroup_bonding_to_string(cgb); if (!t) return -ENOMEM; } else t = (char*) ""; success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t); if (cgb) free(t); return success ? 0 : -ENOMEM; } static int bus_unit_append_cgroups(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; CGroupBonding *cgb; DBusMessageIter sub; if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) return -ENOMEM; LIST_FOREACH(by_unit, cgb, u->cgroup_bondings) { char _cleanup_free_ *t = NULL; bool success; t = cgroup_bonding_to_string(cgb); if (!t) return -ENOMEM; success = dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t); if (!success) return -ENOMEM; } if (!dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static int bus_unit_append_cgroup_attrs(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; CGroupAttribute *a; DBusMessageIter sub, sub2; if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "(sss)", &sub)) return -ENOMEM; LIST_FOREACH(by_unit, a, u->cgroup_attributes) { char _cleanup_free_ *v = NULL; bool success; if (a->semantics && a->semantics->map_write) a->semantics->map_write(a->semantics, a->value, &v); success = dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) && dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &a->controller) && dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &a->name) && dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, v ? &v : &a->value) && dbus_message_iter_close_container(&sub, &sub2); if (!success) return -ENOMEM; } if (!dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static int bus_unit_append_need_daemon_reload(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(i); assert(property); assert(u); b = unit_need_daemon_reload(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_load_error(DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *name, *message; DBusMessageIter sub; assert(i); assert(property); assert(u); if (u->load_error != 0) { name = bus_errno_to_dbus(u->load_error); message = strempty(strerror(-u->load_error)); } else name = message = ""; if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub) || !dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &name) || !dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &message) || !dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) { _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; DBusError error; JobType job_type = _JOB_TYPE_INVALID; bool reload_if_possible = false; int r; dbus_error_init(&error); if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start")) job_type = JOB_START; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop")) job_type = JOB_STOP; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload")) job_type = JOB_RELOAD; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart")) job_type = JOB_RESTART; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "TryRestart")) job_type = JOB_TRY_RESTART; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrRestart")) { reload_if_possible = true; job_type = JOB_RESTART; } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrTryRestart")) { reload_if_possible = true; job_type = JOB_TRY_RESTART; } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Kill")) { const char *swho; int32_t signo; KillWho who; if (!dbus_message_get_args( message, &error, DBUS_TYPE_STRING, &swho, DBUS_TYPE_INT32, &signo, DBUS_TYPE_INVALID)) return bus_send_error_reply(connection, message, &error, -EINVAL); if (isempty(swho)) who = KILL_ALL; else { who = kill_who_from_string(swho); if (who < 0) return bus_send_error_reply(connection, message, &error, -EINVAL); } if (signo <= 0 || signo >= _NSIG) return bus_send_error_reply(connection, message, &error, -EINVAL); SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "stop"); r = unit_kill(u, who, signo, &error); if (r < 0) return bus_send_error_reply(connection, message, &error, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ResetFailed")) { SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "reload"); unit_reset_failed(u); reply = dbus_message_new_method_return(message); if (!reply) goto oom; } else if (streq_ptr(dbus_message_get_member(message), "SetControlGroup")) { DBusMessageIter iter; SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "start"); if (!dbus_message_iter_init(message, &iter)) goto oom; r = bus_unit_cgroup_set(u, &iter); if (r < 0) return bus_send_error_reply(connection, message, NULL, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; } else if (streq_ptr(dbus_message_get_member(message), "UnsetControlGroup")) { DBusMessageIter iter; SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "stop"); if (!dbus_message_iter_init(message, &iter)) goto oom; r = bus_unit_cgroup_unset(u, &iter); if (r < 0) return bus_send_error_reply(connection, message, NULL, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; } else if (streq_ptr(dbus_message_get_member(message), "GetControlGroupAttribute")) { DBusMessageIter iter; _cleanup_strv_free_ char **list = NULL; SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "status"); if (!dbus_message_iter_init(message, &iter)) goto oom; r = bus_unit_cgroup_attribute_get(u, &iter, &list); if (r < 0) return bus_send_error_reply(connection, message, NULL, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; dbus_message_iter_init_append(reply, &iter); if (bus_append_strv_iter(&iter, list) < 0) goto oom; } else if (streq_ptr(dbus_message_get_member(message), "SetControlGroupAttribute")) { DBusMessageIter iter; SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "start"); if (!dbus_message_iter_init(message, &iter)) goto oom; r = bus_unit_cgroup_attribute_set(u, &iter); if (r < 0) return bus_send_error_reply(connection, message, NULL, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; } else if (streq_ptr(dbus_message_get_member(message), "UnsetControlGroupAttribute")) { DBusMessageIter iter; SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "stop"); if (!dbus_message_iter_init(message, &iter)) goto oom; r = bus_unit_cgroup_attribute_unset(u, &iter); if (r < 0) return bus_send_error_reply(connection, message, NULL, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; } else if (UNIT_VTABLE(u)->bus_message_handler) return UNIT_VTABLE(u)->bus_message_handler(u, connection, message); else return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; if (job_type != _JOB_TYPE_INVALID) { const char *smode; JobMode mode; if (!dbus_message_get_args( message, &error, DBUS_TYPE_STRING, &smode, DBUS_TYPE_INVALID)) return bus_send_error_reply(connection, message, &error, -EINVAL); mode = job_mode_from_string(smode); if (mode < 0) { dbus_set_error(&error, BUS_ERROR_INVALID_JOB_MODE, "Job mode %s is invalid.", smode); return bus_send_error_reply(connection, message, &error, -EINVAL); } return bus_unit_queue_job(connection, message, u, job_type, mode, reload_if_possible); } if (reply) if (!bus_maybe_send_reply(connection, message, reply)) goto oom; return DBUS_HANDLER_RESULT_HANDLED; oom: dbus_error_free(&error); return DBUS_HANDLER_RESULT_NEED_MEMORY; } static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) { Manager *m = data; Unit *u; int r; _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; DBusError error; assert(connection); assert(message); assert(m); dbus_error_init(&error); if (streq(dbus_message_get_path(message), "/org/freedesktop/systemd1/unit")) { /* Be nice to gdbus and return introspection data for our mid-level paths */ SELINUX_ACCESS_CHECK(connection, message, "status"); if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) { char *introspection = NULL; FILE *f; Iterator i; const char *k; size_t size; reply = dbus_message_new_method_return(message); if (!reply) goto oom; /* We roll our own introspection code here, instead of * relying on bus_default_message_handler() because we * need to generate our introspection string * dynamically. */ f = open_memstream(&introspection, &size); if (!f) goto oom; fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE "<node>\n", f); fputs(BUS_INTROSPECTABLE_INTERFACE, f); fputs(BUS_PEER_INTERFACE, f); HASHMAP_FOREACH_KEY(u, k, m->units, i) { char *p; if (k != u->id) continue; p = bus_path_escape(k); if (!p) { fclose(f); free(introspection); goto oom; } fprintf(f, "<node name=\"%s\"/>", p); free(p); } fputs("</node>\n", f); if (ferror(f)) { fclose(f); free(introspection); goto oom; } fclose(f); if (!introspection) goto oom; if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) { free(introspection); goto oom; } free(introspection); if (!bus_maybe_send_reply(connection, message, reply)) goto oom; return DBUS_HANDLER_RESULT_HANDLED; } return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; } r = manager_load_unit_from_dbus_path(m, dbus_message_get_path(message), &error, &u); if (r == -ENOMEM) goto oom; if (r < 0) return bus_send_error_reply(connection, message, &error, r); return bus_unit_message_dispatch(u, connection, message); oom: dbus_error_free(&error); return DBUS_HANDLER_RESULT_NEED_MEMORY; } const DBusObjectPathVTable bus_unit_vtable = { .message_function = bus_unit_message_handler }; void bus_unit_send_change_signal(Unit *u) { _cleanup_free_ char *p = NULL; _cleanup_dbus_message_unref_ DBusMessage *m = NULL; assert(u); if (u->in_dbus_queue) { LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u); u->in_dbus_queue = false; } if (!u->id) return; if (!bus_has_subscriber(u->manager)) { u->sent_dbus_new_signal = true; return; } p = unit_dbus_path(u); if (!p) goto oom; if (u->sent_dbus_new_signal) { /* Send a properties changed signal. First for the * specific type, then for the generic unit. The * clients may rely on this order to get atomic * behavior if needed. */ if (UNIT_VTABLE(u)->bus_invalidating_properties) { m = bus_properties_changed_new(p, UNIT_VTABLE(u)->bus_interface, UNIT_VTABLE(u)->bus_invalidating_properties); if (!m) goto oom; if (bus_broadcast(u->manager, m) < 0) goto oom; dbus_message_unref(m); } m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Unit", INVALIDATING_PROPERTIES); if (!m) goto oom; } else { /* Send a new signal */ m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitNew"); if (!m) goto oom; if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &u->id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_INVALID)) goto oom; } if (bus_broadcast(u->manager, m) < 0) goto oom; u->sent_dbus_new_signal = true; return; oom: log_oom(); } void bus_unit_send_removed_signal(Unit *u) { _cleanup_free_ char *p = NULL; _cleanup_dbus_message_unref_ DBusMessage *m = NULL; assert(u); if (!bus_has_subscriber(u->manager)) return; if (!u->sent_dbus_new_signal) bus_unit_send_change_signal(u); if (!u->id) return; p = unit_dbus_path(u); if (!p) goto oom; m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitRemoved"); if (!m) goto oom; if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &u->id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_INVALID)) goto oom; if (bus_broadcast(u->manager, m) < 0) goto oom; return; oom: log_oom(); } DBusHandlerResult bus_unit_queue_job( DBusConnection *connection, DBusMessage *message, Unit *u, JobType type, JobMode mode, bool reload_if_possible) { _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; _cleanup_free_ char *path = NULL; Job *j; JobBusClient *cl; DBusError error; int r; assert(connection); assert(message); assert(u); assert(type >= 0 && type < _JOB_TYPE_MAX); assert(mode >= 0 && mode < _JOB_MODE_MAX); dbus_error_init(&error); if (reload_if_possible && unit_can_reload(u)) { if (type == JOB_RESTART) type = JOB_RELOAD_OR_START; else if (type == JOB_TRY_RESTART) type = JOB_RELOAD; } SELINUX_UNIT_ACCESS_CHECK(u, connection, message, (type == JOB_START || type == JOB_RESTART || type == JOB_TRY_RESTART) ? "start" : type == JOB_STOP ? "stop" : "reload"); if (type == JOB_STOP && u->load_state == UNIT_ERROR && unit_active_state(u) == UNIT_INACTIVE) { dbus_set_error(&error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id); return bus_send_error_reply(connection, message, &error, -EPERM); } if ((type == JOB_START && u->refuse_manual_start) || (type == JOB_STOP && u->refuse_manual_stop) || ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop))) { dbus_set_error(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id); return bus_send_error_reply(connection, message, &error, -EPERM); } r = manager_add_job(u->manager, type, u, mode, true, &error, &j); if (r < 0) return bus_send_error_reply(connection, message, &error, r); cl = job_bus_client_new(connection, bus_message_get_sender_with_fallback(message)); if (!cl) goto oom; LIST_PREPEND(JobBusClient, client, j->bus_client_list, cl); reply = dbus_message_new_method_return(message); if (!reply) goto oom; path = job_dbus_path(j); if (!path) goto oom; if (!dbus_message_append_args( reply, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) goto oom; if (!bus_maybe_send_reply(connection, message, reply)) goto oom; return DBUS_HANDLER_RESULT_HANDLED; oom: dbus_error_free(&error); return DBUS_HANDLER_RESULT_NEED_MEMORY; } static int parse_mode(DBusMessageIter *iter, bool *runtime, bool next) { const char *mode; int r; assert(iter); assert(runtime); r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &mode, next); if (r < 0) return r; if (streq(mode, "runtime")) *runtime = true; else if (streq(mode, "persistent")) *runtime = false; else return -EINVAL; return 0; } int bus_unit_cgroup_set(Unit *u, DBusMessageIter *iter) { _cleanup_free_ char *controller = NULL, *old_path = NULL, *new_path = NULL, *contents = NULL; const char *name; CGroupBonding *b; bool runtime; int r; assert(u); assert(iter); if (!unit_get_exec_context(u)) return -EINVAL; r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, true); if (r < 0) return r; r = parse_mode(iter, &runtime, false); if (r < 0) return r; r = cg_split_spec(name, &controller, &new_path); if (r < 0) return r; if (!new_path) { new_path = unit_default_cgroup_path(u); if (!new_path) return -ENOMEM; } if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER)) return -EINVAL; b = cgroup_bonding_find_list(u->cgroup_bondings, controller); if (b) { if (streq(b->path, new_path)) return 0; if (b->essential) return -EINVAL; old_path = strdup(b->path); if (!old_path) return -ENOMEM; } r = unit_add_cgroup_from_text(u, name, true, &b); if (r < 0) return r; if (r > 0) { CGroupAttribute *a; /* Try to move things to the new place, and clean up the old place */ cgroup_bonding_realize(b); cgroup_bonding_migrate(b, u->cgroup_bondings); if (old_path) cg_trim(controller, old_path, true); /* Apply the attributes to the new group */ LIST_FOREACH(by_unit, a, u->cgroup_attributes) if (streq(a->controller, controller)) cgroup_attribute_apply(a, b); } contents = strjoin("[", UNIT_VTABLE(u)->exec_section, "]\n" "ControlGroup=", name, "\n", NULL); if (!contents) return -ENOMEM; return unit_write_drop_in(u, runtime, controller, contents); } int bus_unit_cgroup_unset(Unit *u, DBusMessageIter *iter) { _cleanup_free_ char *controller = NULL, *path = NULL, *target = NULL; const char *name; CGroupAttribute *a, *n; CGroupBonding *b; bool runtime; int r; assert(u); assert(iter); if (!unit_get_exec_context(u)) return -EINVAL; r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, true); if (r < 0) return r; r = parse_mode(iter, &runtime, false); if (r < 0) return r; r = cg_split_spec(name, &controller, &path); if (r < 0) return r; if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER)) return -EINVAL; b = cgroup_bonding_find_list(u->cgroup_bondings, controller); if (!b) return -ENOENT; if (path && !path_equal(path, b->path)) return -ENOENT; if (b->essential) return -EINVAL; unit_remove_drop_in(u, runtime, controller); /* Try to migrate the old group away */ if (cg_get_by_pid(controller, 0, &target) >= 0) cgroup_bonding_migrate_to(u->cgroup_bondings, target, false); cgroup_bonding_free(b, true); /* Drop all attributes of this controller */ LIST_FOREACH_SAFE(by_unit, a, n, u->cgroup_attributes) { if (!streq(a->controller, controller)) continue; unit_remove_drop_in(u, runtime, a->name); cgroup_attribute_free(a); } return 0; } int bus_unit_cgroup_attribute_get(Unit *u, DBusMessageIter *iter, char ***_result) { _cleanup_free_ char *controller = NULL; CGroupAttribute *a; CGroupBonding *b; const char *name; char **l = NULL; int r; assert(u); assert(iter); assert(_result); if (!unit_get_exec_context(u)) return -EINVAL; r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, false); if (r < 0) return r; r = cg_controller_from_attr(name, &controller); if (r < 0) return r; /* First attempt, read the value from the kernel */ b = cgroup_bonding_find_list(u->cgroup_bondings, controller); if (b) { _cleanup_free_ char *p = NULL, *v = NULL; r = cg_get_path(b->controller, b->path, name, &p); if (r < 0) return r; r = read_full_file(p, &v, NULL); if (r >= 0) { /* Split on new lines */ l = strv_split_newlines(v); if (!l) return -ENOMEM; *_result = l; return 0; } } /* If that didn't work, read our cached value */ LIST_FOREACH(by_unit, a, u->cgroup_attributes) { if (!cgroup_attribute_matches(a, controller, name)) continue; r = strv_extend(&l, a->value); if (r < 0) { strv_free(l); return r; } } if (!l) return -ENOENT; *_result = l; return 0; } static int update_attribute_drop_in(Unit *u, bool runtime, const char *name) { _cleanup_free_ char *buf = NULL; CGroupAttribute *a; assert(u); assert(name); LIST_FOREACH(by_unit, a, u->cgroup_attributes) { if (!cgroup_attribute_matches(a, NULL, name)) continue; if (!buf) { buf = strjoin("[", UNIT_VTABLE(u)->exec_section, "]\n" "ControlGroupAttribute=", a->name, " ", a->value, "\n", NULL); if (!buf) return -ENOMEM; } else { char *b; b = strjoin(buf, "ControlGroupAttribute=", a->name, " ", a->value, "\n", NULL); if (!b) return -ENOMEM; free(buf); buf = b; } } if (buf) return unit_write_drop_in(u, runtime, name, buf); else return unit_remove_drop_in(u, runtime, name); } int bus_unit_cgroup_attribute_set(Unit *u, DBusMessageIter *iter) { _cleanup_strv_free_ char **l = NULL; int r; bool runtime = false; char **value; const char *name; assert(u); assert(iter); if (!unit_get_exec_context(u)) return -EINVAL; r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, true); if (r < 0) return r; r = bus_parse_strv_iter(iter, &l); if (r < 0) return r; if (!dbus_message_iter_next(iter)) return -EINVAL; r = parse_mode(iter, &runtime, false); if (r < 0) return r; STRV_FOREACH(value, l) { _cleanup_free_ char *v = NULL; CGroupAttribute *a; const CGroupSemantics *s; r = cgroup_semantics_find(NULL, name, *value, &v, &s); if (r < 0) return r; if (s && !s->multiple && l[1]) return -EINVAL; r = unit_add_cgroup_attribute(u, s, NULL, name, v ? v : *value, &a); if (r < 0) return r; if (r > 0) { CGroupBonding *b; b = cgroup_bonding_find_list(u->cgroup_bondings, a->controller); if (!b) { /* Doesn't exist yet? Then let's add it */ r = unit_add_cgroup_from_text(u, a->controller, false, &b); if (r < 0) return r; if (r > 0) { cgroup_bonding_realize(b); cgroup_bonding_migrate(b, u->cgroup_bondings); } } /* Make it count */ cgroup_attribute_apply(a, u->cgroup_bondings); } } r = update_attribute_drop_in(u, runtime, name); if (r < 0) return r; return 0; } int bus_unit_cgroup_attribute_unset(Unit *u, DBusMessageIter *iter) { const char *name; bool runtime; int r; assert(u); assert(iter); if (!unit_get_exec_context(u)) return -EINVAL; r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, true); if (r < 0) return r; r = parse_mode(iter, &runtime, false); if (r < 0) return r; cgroup_attribute_free_some(u->cgroup_attributes, NULL, name); update_attribute_drop_in(u, runtime, name); return 0; } const BusProperty bus_unit_properties[] = { { "Id", bus_property_append_string, "s", offsetof(Unit, id), true }, { "Names", bus_unit_append_names, "as", 0 }, { "Following", bus_unit_append_following, "s", 0 }, { "Requires", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_REQUIRES]), true }, { "RequiresOverridable", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_REQUIRES_OVERRIDABLE]), true }, { "Requisite", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_REQUISITE]), true }, { "RequisiteOverridable", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_REQUISITE_OVERRIDABLE]), true }, { "Wants", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_WANTS]), true }, { "BindsTo", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_BINDS_TO]), true }, { "PartOf", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_PART_OF]), true }, { "RequiredBy", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), true }, { "RequiredByOverridable",bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_REQUIRED_BY_OVERRIDABLE]), true }, { "WantedBy", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_WANTED_BY]), true }, { "BoundBy", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_BOUND_BY]), true }, { "ConsistsOf", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), true }, { "Conflicts", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_CONFLICTS]), true }, { "ConflictedBy", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), true }, { "Before", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_BEFORE]), true }, { "After", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_AFTER]), true }, { "OnFailure", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_ON_FAILURE]), true }, { "Triggers", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_TRIGGERS]), true }, { "TriggeredBy", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), true }, { "PropagatesReloadTo", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), true }, { "ReloadPropagatedFrom", bus_unit_append_dependencies, "as", offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), true }, { "RequiresMountsFor", bus_property_append_strv, "as", offsetof(Unit, requires_mounts_for), true }, { "Documentation", bus_property_append_strv, "as", offsetof(Unit, documentation), true }, { "Description", bus_unit_append_description, "s", 0 }, { "LoadState", bus_unit_append_load_state, "s", offsetof(Unit, load_state) }, { "ActiveState", bus_unit_append_active_state, "s", 0 }, { "SubState", bus_unit_append_sub_state, "s", 0 }, { "FragmentPath", bus_property_append_string, "s", offsetof(Unit, fragment_path), true }, { "SourcePath", bus_property_append_string, "s", offsetof(Unit, source_path), true }, { "DropInPaths", bus_property_append_strv, "as", offsetof(Unit, dropin_paths), true }, { "UnitFileState", bus_unit_append_file_state, "s", 0 }, { "InactiveExitTimestamp",bus_property_append_usec, "t", offsetof(Unit, inactive_exit_timestamp.realtime) }, { "InactiveExitTimestampMonotonic", bus_property_append_usec, "t", offsetof(Unit, inactive_exit_timestamp.monotonic) }, { "ActiveEnterTimestamp", bus_property_append_usec, "t", offsetof(Unit, active_enter_timestamp.realtime) }, { "ActiveEnterTimestampMonotonic", bus_property_append_usec, "t", offsetof(Unit, active_enter_timestamp.monotonic) }, { "ActiveExitTimestamp", bus_property_append_usec, "t", offsetof(Unit, active_exit_timestamp.realtime) }, { "ActiveExitTimestampMonotonic", bus_property_append_usec, "t", offsetof(Unit, active_exit_timestamp.monotonic) }, { "InactiveEnterTimestamp", bus_property_append_usec, "t", offsetof(Unit, inactive_enter_timestamp.realtime) }, { "InactiveEnterTimestampMonotonic",bus_property_append_usec, "t", offsetof(Unit, inactive_enter_timestamp.monotonic) }, { "CanStart", bus_unit_append_can_start, "b", 0 }, { "CanStop", bus_unit_append_can_stop, "b", 0 }, { "CanReload", bus_unit_append_can_reload, "b", 0 }, { "CanIsolate", bus_unit_append_can_isolate, "b", 0 }, { "Job", bus_unit_append_job, "(uo)", 0 }, { "StopWhenUnneeded", bus_property_append_bool, "b", offsetof(Unit, stop_when_unneeded) }, { "RefuseManualStart", bus_property_append_bool, "b", offsetof(Unit, refuse_manual_start) }, { "RefuseManualStop", bus_property_append_bool, "b", offsetof(Unit, refuse_manual_stop) }, { "AllowIsolate", bus_property_append_bool, "b", offsetof(Unit, allow_isolate) }, { "DefaultDependencies", bus_property_append_bool, "b", offsetof(Unit, default_dependencies) }, { "OnFailureIsolate", bus_property_append_bool, "b", offsetof(Unit, on_failure_isolate) }, { "IgnoreOnIsolate", bus_property_append_bool, "b", offsetof(Unit, ignore_on_isolate) }, { "IgnoreOnSnapshot", bus_property_append_bool, "b", offsetof(Unit, ignore_on_snapshot) }, { "NeedDaemonReload", bus_unit_append_need_daemon_reload, "b", 0 }, { "JobTimeoutUSec", bus_property_append_usec, "t", offsetof(Unit, job_timeout) }, { "ConditionTimestamp", bus_property_append_usec, "t", offsetof(Unit, condition_timestamp.realtime) }, { "ConditionTimestampMonotonic", bus_property_append_usec, "t", offsetof(Unit, condition_timestamp.monotonic) }, { "ConditionResult", bus_property_append_bool, "b", offsetof(Unit, condition_result) }, { "LoadError", bus_unit_append_load_error, "(ss)", 0 }, { NULL, } }; const BusProperty bus_unit_cgroup_properties[] = { { "DefaultControlGroup", bus_unit_append_default_cgroup, "s", 0 }, { "ControlGroups", bus_unit_append_cgroups, "as", 0 }, { "ControlGroupAttributes", bus_unit_append_cgroup_attrs, "a(sss)", 0 }, { NULL, } };